The native Lua Documentation¶
Welcome to the native Lua project documentation.
native Lua is framework to build and test Lua on different platforms.
The native Lua Project¶
Lua on the platform you use with the compiler you choose
Lua is multi-paradigm programming language. Lua is cross-platform as it is written in ANSI C. Lua is licensed under MIT license. native Luas goal is to deliver a framework to build Lua on any platform with any compiler.
For information on Lua see Lua.org.
Overview¶
As default Lua requires gcc and make to be installed to build the
Lua binaries, therefore building for e.g., Linux or other POSIX systems where
gcc and make are natively available is easy. Building Lua on Windows
with MinGWs’ gcc and some sort of make is also straight forward.
But this does not allow a good platform and compiler independent way of building and testing Lua. Especially testing is not that simple as it should be. Therefore this project tries to implement a platform and compiler independent way of building and testing Lua.
How-To¶
Building Lua with the native Lua project requires Python 3.5 or greater and some C compiler.
Supported Platforms And Compilers¶
The current release supports the following platform/compiler combinations:
Platform |
Official Lua Releases |
native Lua Releases |
|---|---|---|
aix |
gcc |
xlc*, gcc*, clang* |
bsd |
gcc |
see OpenBSD and NetBSD |
OpenBSD |
see bsd |
gcc, clang |
NetBSD |
see bsd |
gcc*, clang* |
c89 |
gcc |
all compilers* |
FreeBSD |
gcc |
gcc, clang |
generic |
gcc |
gcc (not win32), msvc (win32) |
linux |
gcc |
gcc, clang, icc* |
macOS |
gcc |
gcc, clang |
MinGW |
gcc |
see win32 |
posix |
gcc |
TODO |
solaris |
gcc |
gcc*, clang* |
win32 |
see MinGw |
msvc, gcc, clang |
cygwin |
no |
gcc, clang |
* means not or not fully tested.
Repository Structure And Code Organization¶
The repository is structured into the parts described below.
Root Directory¶
The root directory contains the
general project documentation (
README.md,CHANGELOG.md)build script and build toolchain (
wscript,waf,waf.bat),required Python packages (
requirements.txt,environment.yml),CI scripts (
.appveyor.yml,.cirrus.yml,.travis.yml,azure-pipelines.yml,readthedocs.yml),editor configurations (
.vscode,.editorconfig),coding and general guidelines (
pyproject.toml),licensing information (
LICENSE),and information on the
native Luaproject and the lua version (VERSION).
demos Directory¶
Some scripts demonstrating what can be done with Lua. These demos should not use libraries that do not come with the Lua interpreter.
docs Directory¶
This directory contains the native Lua project documentation as well as the
official Lua documentation. The official Lua documentation is found in
_static/doc. This documentation is also linked into the project
documentation. The main documentation files index.rst, conf.py and
doxygen.conf are found here. Contribution guidelines are found in
contributing.rst.
native Lua uses the ReadTheDocs Sphinx theme sphinx_rtd_theme as
layout theme for the documentation.
src Directory¶
This directory contains the source files downloaded from Lua.org. Trailing whitespace and additional newlines at the end of the files are removed. Furthermore the native Lua header is included (see _native_lua_config.h).
Changes are indicated by the following comment:
/* native Lua */
The lua interpreter (lua.c) as well as the lua compiler (luac.c) have
been changed, to indicate, that they were build based on the native Lua
project:
$ build/gcc/lua -v
Lua 5.4.0 Copyright (C) 1994-2017 Lua.org, PUC-Rio [based on native Lua (0.5.0-devel), https://github.com/swaldhoer/native-lua]
tests Directory¶
This directory contains the source files downloaded from Lua.org. Trailing whitespace and additional newlines at the end of the files are removed.
Note
The encoding of test files must not be changed.
Some tests require changes to the test files in order to work on platforms. Changes are indicated by the following comment:
-- native Lua
Test files for the build toolchain have been added in tests/build.
Links¶
Documentation¶
The documentation can be found on readthedocs.io.
Continuous Integration¶
Azure Pipelines: Linux (GCC, Clang), MacOS (Clang, GCC), Windows (MSVC, GCC, Clang)
AppVeyor: Windows (Cygwin GCC, Cygwin Clang)
Cirrus CI: Linux (GCC, Clang), FreeBSD(Clang, GCC)
Travis CI: Linux (GCC, Clang)
ReadTheDocs.org: Documentation
On Azure Pipelines’ Windows build we also run black and pylint.
License¶
This page list the license information for files included in this repository.
Lua License¶
Lua is distributed under the terms of the MIT license.
The MIT license is also found at end of file lua.h:
/******************************************************************************
* Copyright (C) 1994-2020 Lua.org, PUC-Rio.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
******************************************************************************/
native Lua License¶
native Lua is distributed under the terms of the MIT license.
The license information is found in the file LICENSE.
MIT License
Copyright (c) 2018-2020 Stefan Waldhör
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
waf License¶
waf is distributed under the terms of a BSD license.
The license information is found in the file
waf.
"""
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. The name of the author may not be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
"""
Changelog¶
All notable changes to this project will be documented in this file.
The format is based on Keep a Changelog v1.0.0, and this project adheres to Semantic Versioning v2.0.0.
[Unreleased]¶
Added¶
Added pip requirements file to simplify dependency management (see
requirements.txt).
Changed¶
Updated to waf version 2.0.20 (
waf,wscript).Use absolute include paths for
Microsoft Visual StudioandWindows Kitspaths (wscript).Updated to Lua version to 5.4.0 (see
src/*).Updated to Lua test version to 5.4.0 (see
tests/*).On Linux Lua can be built without readline support # TODO
Since Lua 5.4.0 compiler modules are compiled with
-Osto reduce code size. Compiler modules are lex, parser and code (seesrc/llex.c,src/lparser.c,lcodeandwscript).The
pylintconfiguration was moved from.pylintrc` `to ``pyproject.toml(seepyproject.toml).Use json to load the version information from
VERSIONfile and removedpyyamldependency (VERSION,wscript).Rewrote documentation build tools (
scripts/doxygen.py,scripts/sphinx.py)Updated doxygen configuration to doxygen 1.8.20 (
doxygen.conf)
Removed¶
Removed copy of the sphinx_rtd_theme theme (
docs/_themes/sphinx_rtd_theme/**)
Fixed¶
Fixed typos in changelog (
CHANGELOG.rst).
[0.4.0] - 2020-03-05¶
Added¶
Added support for clang on Cygwin (see
wscript).Added doxygen API documentation (
.readthedocs.yml,conf.py,docs/environment.yml).Added waf tool to configure DOT (
scripts/dot.py).
Changed¶
Updated documentation on supported platforms and compilers (
README.rst).Updated documentation on Continuous Integration infrastructure. Now tests are also performed on Linux on s390x and arm64 (
.travis.yml,docs/ci.rst).Default Python is longer automatically detected on Windows when using
waf.bat(waf.bat).
Fixed¶
waf help showed wrong build commands (
wscript).Table width are now correctly handled in the documentation (
conf.py,docs/_static/custom.css).Rewrote waf tools for Sphinx and doxygen (
scripts/doxygen.py,scripts/sphinx.py).waf did no show all available commands if no build variant is given (
wscript).
[0.3.0] - 2020-01-06¶
Added¶
Added doxygen configuration (see
doxygen.conf,docs/_doxygen/*).Added support for OpenBSD and NetBSD (
wscript).Added documentation for third party sources.
Changed¶
Simplified the library build test (
wscript).
Fixed¶
Build function for Solaris was wrong (
wscript).
[0.2.0] - 2019-11-23¶
Added¶
Added header for C/C++ files (see
CONTRIBUTING.rst).Added the license information for sphinx_rtd_theme (
docs/_themes/sphinx_rtd_theme/LICENSE).Added information on the build and install process (
docs/build.rst,docs/install.rst).
Changed¶
Updated to Lua version 5.3.5 (see
src/*).Updated sphinx_rtd_theme to 2a1b2e1353f6401af96885a66488ac0811110ba2.
Check that all version numbers in the project match during project configuration (
wscript).Use yaml to load the version information from
VERSIONfile.Issue a warning if the lua binaries are installed into a directory that is not available in PATH.
Removed¶
Unused file
tests/all_win.luahas been removed.
Fixed¶
Lua manual was not correctly linked into the documentation. Now man files are correctly installed into
man/man1on Unix-like systems.Fixed list of tested compilers and platforms (
README.rst).Consequently use the correct project name
native Lua(previouslynative-lua).man files were installed into $PREFIX. Now they are correctly installed into man/man1.
Fixed linker flags on macOS when using GCC.
[0.1.0] - 2019-10-15¶
Added¶
Added a rules for contributing to the project (see
CONTRIBUTING.rst).Added a script to make testing simpler (
scripts/run_test.py).Added generic build option.
Added
VERSIONfile to indicate the native Lua project version and the lua and lua tests version obtained from lua.org.include and man files are installed.
added sphinx_rtd_theme (based on commit feb0beb44a444f875f3369a945e6055965ee993f from https://github.com/readthedocs/sphinx_rtd_theme)
Added a batch wrapper script for waf on Windows (
waf.bat)Added test files for Windows and Cygwin to test the build tools
For Linux (clang, gcc), macOS (clang), FreeBSD (clang, gcc) and Windows (clang, gcc, msvc) the lua test suite passes with
lua -e"_U=true" all.lua.
Changed¶
Pasted build step from
lua/wscripttowscriptto have only onewscript. These changes should be transparent.Rewrote configure step to print better readable output.
Restructured the way sources, documentation etc. are stored.
Removed¶
lua/wscript, see section Changed.Removed support for Python versions < 3.5
Fixed¶
Use correct include path of the of the readline library on FreeBSD when using clang.
Use correct rpath on FreeBSD when using gcc.
Fixed clang linker flag on OSX.
Fixed clang linker flags on Windows.
Fixed license file name (
LICENSE).Fixed typos.
Contributing¶
License¶
By contributing to this repository/project you are licensing your contributions under MIT license.
Coding Guidelines¶
Limit characters to 79 characters per line
Add one empty line at the end of a file (POSIX 3.206 Line)
Python files must follow the rules defined in pyproject.toml
Python files must have the following header
1 2 3 4
#!/usr/bin/env python # encoding: utf-8 # SPDX-License-Identifier: MIT
lua files must have the following header
1 2 3
#!/usr/bin/env lua -- SPDX-License-Identifier: MIT
C/C++ files must have the following header
1
/* SPDX-License-Identifier: MIT */
Building Lua¶
Building¶
To build Lua on your platform, check which compilers were successfully configured. If e.g., gcc was successfully configured, simply run:
Windows
waf build_gcc
Linux/Unix-like/macOS
$ python3 waf build_gcc
General Build Information¶
native Lua tries to follow the official build instructions are far as possible. This means:
Build a statically linked library based on the following files:
lapi.clcode.cldo.clctype.cldebug.cldump.clfunc.clgc.cllex.clmem.clobject.clopcodes.clparser.clstate.clstring.cltable.cltm.clundump.clvm.clzio.clauxlib.clbaselib.clcorolib.cldblib.cliolib.clmathlib.closlib.clstrlib.cltablib.clutf8lib.cloadlib.clinit.c
The files lcode.c, llex.c and lparser are built as compiler module
sources optimized for size (-Os, /Os) in contrast to the other sources
(-02, /O2).
Windows only: Build a dynamically linked library based on the same files as the statically linked library.
Build the interpreter (source:
lua.c) and link with the statically linked library (Unix-like) or with the dynamically linked library on Windows.Build the compiler (source:
luac.c) and link with the statically linked library.
Implementation Details Of The Build Process¶
native Lua uses waf as build tool. For details on waf see
waf.io. The build instructions are implement in the build
script (wscript).
The build process consists of two steps:
configuration
build
During the configure step platform and compiler specific settings are created. A list of successfully configured compilers is created.
For details see the function configure in wscript.
The build step is specific for most platforms. There are build functions for each supported platform.
For details see the function build in wscript.
OS Specific Information¶
TODO
Installing Lua¶
After a successfully building lua binaries with e.g. gcc, you can install lua by running:
Windows
waf install_gcc
Linux/Unix/Unix-like/macOS
$ python3 waf install_gcc
The following files are installed:
Windows
%LOCALAPPDATA%\Programs\lua\bin
lua.exe
lua.exe.manifest (msvc only)
luac.exe
luac.exe.manifest (msvc only)
luadll.dll
luadll.dll.manifest (msvc only)
%LOCALAPPDATA%\Programs\lua\include
lauxlib.h
lua.h
lua.hpp
luaconf.h
lualib.h
%LOCALAPPDATA%\Programs\lua\lib
luadll.dll.a (gcc only)
luadll.dll (clang, msvc only)
luadll.dll.manifest (msvc only)
luadll.lib (msvc only)
Linux/Unix/Unix-like/macOS
/usr/local/bin/
lua
luac
/usr/local/include/
lua.h
luaconf.h
lualib.h
lauxlib.h
lua.hpp
/usr/local/share/man/man1/
lua.1
luac.1
Testing Lua¶
Testing the build involves the following steps:
project configuration
build lua/luac with some compiler
installing lua and its dependencies
running the tests
A script (scripts/run_test.py) is provided under to make this step more
convenient.
This script runs the full tests (that means without specifying
-e"_U=true"), but without using ltests.
These parameters can however be set using command line arguments.
Manual¶
The document below shows the official Lua manual as it is distributed.
API¶
The document below shows the Lua API reference documentation generated by doxygen.
Demos¶
Continuous Integration¶
To test the project the continuous integration tools
AppVeyor,
Azure Pipelines,
Cirrus CI and
Travis CI.
are used.
Project Status¶
CI Service |
Build Status |
Platform on Architecture with compiler |
|---|---|---|
AppVeyor |
|
|
Azure Pipelines |
|
|
Travis-CI |
|
|
Cirrus-CI |
|
|
Configuration Details¶
AppVeyor¶
AppVeyor CI is configured by the .appveyor.yml file.
AppVeyor CI configuration¶
version: 5.4.0.{build}
image: Visual Studio 2019
cache:
- C:\cygwin64\var\cache
- C:\cygwin64\home\appveyor\.cache\pip
skip_commits:
files:
- .vscode/*
- .github/*
- .cirrus.yml
- .editorconfig
- .gitattributes
- .gitignore
- .travis.yml
- .readthedocs.yml
- azure-pipelines.yml
- docs/environment.yml
init:
- git config --global core.autocrlf input
install:
- cmd: curl.exe -o setup-x86_64.exe http://www.cygwin.com/setup-x86_64.exe
- cmd: setup-x86_64.exe --no-desktop --no-shortcuts --no-startmenu --quiet-mode --packages alternatives,wget,python37,python37-devel,python37-pip,doxygen,graphviz,llvm,clang
- cmd: C:\cygwin64\bin\bash.exe -l -c "unlink /usr/bin/python3"
- cmd: C:\cygwin64\bin\bash.exe -l -c "/usr/sbin/update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.6 0 --slave /usr/bin/pip3 pip3 /usr/bin/pip3.6"
- cmd: C:\cygwin64\bin\bash.exe -l -c "/usr/sbin/update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.7 10 --slave /usr/bin/pip3 pip3 /usr/bin/pip3.7"
- cmd: C:\cygwin64\bin\bash.exe -l -c "/usr/sbin/update-alternatives --install /usr/bin/python python /usr/bin/python3 10 --slave /usr/bin/pip pip /usr/bin/pip3"
- cmd: C:\cygwin64\bin\bash.exe -l -c "/usr/sbin/update-alternatives --set python3 /usr/bin/python3.7"
- cmd: C:\cygwin64\bin\bash.exe -l -c "/usr/sbin/update-alternatives --set python /usr/bin/python3"
- cmd: C:\cygwin64\bin\bash.exe -l -c "python3 --version"
- cmd: C:\cygwin64\bin\bash.exe -l -c "python3 -m ensurepip --upgrade"
- cmd: C:\cygwin64\bin\bash.exe -l -c "python3 -m pip install --upgrade pip"
- cmd: C:\cygwin64\bin\bash.exe -l -c "export C_INCLUDE_PATH=/usr/include/python3.7m && python3 -m pip install --upgrade --requirement /cygdrive/c/projects/native-lua/requirements.txt"
- cmd: C:\cygwin64\bin\bash.exe -l -c "doxygen --version"
- cmd: C:\cygwin64\bin\bash.exe -l -c "dot -V"
- cmd: C:\cygwin64\bin\bash.exe -l -c "python3 --version"
- cmd: C:\cygwin64\bin\bash.exe -l -c "clang --version"
- cmd: C:\cygwin64\bin\bash.exe -l -c "gcc --version"
- cmd: set PATH=%PATH%;%userprofile%\AppData\Local\Programs\lua\bin
before_build:
# check that the correct python versions are used
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua && python3 waf configure"
build_script:
# build documentation
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua && python3 waf build_docs"
# --include-tests
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua && python3 waf distclean configure --include-tests"
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua && python3 waf build_gcc"
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua && python3 waf install_gcc"
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua/build/gcc/tests && which lua && lua -v && lua -e\"_U=true\" all.lua"
#- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua/build/gcc/tests && which lua && lua -v && lua all.lua"
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua && python3 waf uninstall_gcc"
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua && python3 waf build_clang"
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua && python3 waf install_clang"
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua/build/clang/tests && which lua && lua -v && lua -e\"_U=true\" all.lua"
#- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua/build/clang/tests && which lua && lua -v && lua all.lua"
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua && python3 waf uninstall_clang"
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua && python3 waf distclean"
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua && python3 scripts/run_test.py -c gcc -c clang --simple-test"
# --ltests --include-tests
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua && python3 waf distclean configure --ltests --include-tests"
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua && python3 waf build_gcc"
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua && python3 waf install_gcc"
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua/build/gcc/tests && which lua && lua -v && lua -e\"_U=true\" all.lua"
#- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua/build/gcc/tests && which lua && lua -v && lua all.lua"
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua && python3 waf uninstall_gcc"
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua && python3 waf build_clang"
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua && python3 waf install_clang"
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua/build/clang/tests && which lua && lua -v && lua -e\"_U=true\" all.lua"
#- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua/build/gcc/tests && which lua && lua -v && lua all.lua"
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua && python3 waf uninstall_clang"
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua && python3 waf distclean"
- cmd: C:\cygwin64\bin\bash.exe -l -c "cd /cygdrive/c/projects/native-lua && python3 scripts/run_test.py -c gcc -c clang --simple-test"
Azure Pipelines¶
Azure Pipelines CI is configured by the azure-pipelines.yml file.
Azure Pipelines CI configuration¶
# specific path build
trigger:
paths:
exclude:
- .vscode/*
- .github/*
- .appveyor.yml
- .cirrus.yml
- .editorconfig
- .gitattributes
- .gitignore
- .travis.yml
- .readthedocs.yml
- docs/environment.yml
- pyproject.toml
variables:
NATIVE_LUA_CI_BUILD: "TRUE"
jobs:
- job: Linux
pool:
vmImage: "ubuntu-18.04"
displayName: "Linux Build"
steps:
- task: UsePythonVersion@0
inputs:
versionSpec: "3.6"
architecture: "x64"
- script: lsb_release -a
displayName: Ubuntu details
- script: echo "##vso[task.prependpath]/opt/lua/bin"
displayName: Add to path
- script: echo $PATH
displayName: echo PATH
- script: |
set -euxo pipefail
wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
sudo apt-get update
sudo apt-get install -y dialog apt-utils software-properties-common libreadline7 libreadline-dev doxygen graphviz
sudo apt-add-repository "deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-10 main"
sudo apt-get install -y build-essential
sudo apt-get update
sudo apt-get install -y clang-10 lld-10
sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-10 100
python -m pip install --upgrade pip
python -m pip install --upgrade --requirement requirements.txt
displayName: Install dependencies
- script: |
python --version
gcc --version
clang --version
doxygen --version
dot -V
sphinx-build --version
displayName: Compiler and Tools versions
- script: |
set -euxo pipefail
python waf configure -v
python waf build_docs
python waf clean_docs
python waf distclean
displayName: Documentation build
- script: |
set -euxo pipefail
python waf configure --include-tests --prefix=/opt/lua
python waf build_gcc
python waf install_gcc
pushd build/gcc/tests
lua -e"_U=true" all.lua
lua all.lua
popd
python waf uninstall_gcc
python waf clean_gcc
python waf distclean
displayName: GCC build including tests
- script: |
set -euxo pipefail
python waf configure --ltests --include-tests --prefix=/opt/lua
python waf build_gcc
python waf install_gcc
pushd build/gcc/tests
lua -e"_U=true" all.lua
lua all.lua
popd
python waf uninstall_gcc
python waf clean_gcc
displayName: GCC build including tests and ltests
- script: |
set -euxo pipefail
python waf configure --include-tests --prefix=/opt/lua
python waf build_clang
python waf install_clang
pushd build/clang/tests
lua -e"_U=true" all.lua
lua all.lua
popd
python waf uninstall_clang
python waf clean_clang
python waf distclean
displayName: clang build including tests
- script: |
set -euxo pipefail
python waf configure --ltests --include-tests --prefix=/opt/lua
python waf build_clang
python waf install_clang
pushd build/clang/tests
lua -e"_U=true" all.lua
lua all.lua
popd
python waf uninstall_clang
python waf clean_clang
displayName: clang build including tests and ltests
- script: |
set -euxo pipefail
python scripts/run_test.py -c gcc -c clang --simple-test
displayName: test script (gcc, clang) with --simple-test
- script: |
set -euxo pipefail
python scripts/run_test.py -c gcc -c clang --simple-test --ltests
displayName: test script (gcc, clang) with --simple-test and ltests
- job: Windows
pool:
vmImage: "windows-2019"
displayName: "Windows Build"
steps:
- task: UsePythonVersion@0
inputs:
versionSpec: "3.6"
addToPath: true
architecture: "x64"
- script: python -m pip install --upgrade pip
displayName: "Upgrad pip and friends"
- script: python -m pip install --upgrade --requirement requirements.txt
displayName: "Install requirements.txt"
- script: choco install llvm -y --version 10.0.0
displayName: Install LLVM
- script: |
curl.exe -o $(Agent.TempDirectory)\doxygen-x64.zip https://www.doxygen.nl/files/doxygen-1.8.20.windows.x64.bin.zip
curl.exe -o $(Agent.TempDirectory)\graphviz.zip https://graphviz.gitlab.io/_pages/Download/windows/graphviz-2.38.zip
displayName: Downloading doxygen and graphviz
- task: ExtractFiles@1
inputs:
archiveFilePatterns: "$(Agent.TempDirectory)/*.zip"
destinationFolder: "$(Agent.TempDirectory)"
cleanDestinationFolder: false
displayName: Extracting doxygen and graphviz
- script: echo "##vso[task.prependpath]$(Agent.TempDirectory)
displayName: Add doxygen to path
- script: echo "##vso[task.prependpath]$(Agent.TempDirectory)\release\bin
displayName: Add graphviz to path
- script: echo "##vso[task.prependpath]C:\Program Files\LLVM\bin
displayName: Add clang to path
- script: echo %PATH%
displayName: echo PATH
- script: |
python --version
gcc --version
clang --version
"C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Tools\MSVC\14.24.28314\bin\HostX64\x64\CL.exe"
doxygen --version
dot -V
sphinx-build --version
black --version
pylint --version
displayName: Compiler and Tools versions
- script: python scripts\run_test.py -c msvc -c gcc -c clang --simple-test -vv
displayName: test script (msvc, gcc, clang) with --simple-test
- script: python scripts\run_test.py -c msvc -c gcc -c clang --simple-test --ltests -vv
displayName: test script (msvc, gcc, clang) with --simple-test and ltests
- job: OSXBuild
pool:
vmImage: "macOS-10.14"
displayName: "MacOSX Build"
steps:
- task: UsePythonVersion@0
inputs:
versionSpec: "3.6"
- script: echo "##vso[task.prependpath]/opt/lua/bin"
displayName: Add lua install path to path
- script: echo "##vso[task.prependpath]/usr/local/Cellar/gcc/10.2.0/bin/"
displayName: Add gcc to path
- script: echo $PATH
displayName: echo PATH
- script: |
set -euxo pipefail
brew install --force gcc coreutils
brew ls --verbose gcc
brew unlink gcc
brew link gcc --dry-run
brew link gcc
ln -s /usr/local/bin/gcc-10 /usr/local/bin/gcc
which gcc
greadlink -f `which gcc`
echo | gcc -E -Wp,-v -
gcc -dM -E - < /dev/null
brew install doxygen
brew install graphviz
python -m pip install --upgrade pip
python -m pip install --upgrade --requirement requirements.txt
displayName: Install dependencies
- script: |
python --version
gcc --version
clang --version
doxygen --version
dot -V
sphinx-build --version
displayName: Compiler and Tools versions
- script: |
set -euxo pipefail
python waf configure -v
python waf build_docs
python waf clean_docs
python waf distclean
displayName: Documentation build
- script: |
set -euxo pipefail
python waf configure --include-tests --prefix=/opt/lua -v
displayName: configure with tests
- script: |
set -euxo pipefail
python waf build_clang -v
sudo python waf install_clang
pushd build/clang/tests
lua -e"_U=true" all.lua
# lua all.lua
popd
sudo python waf uninstall_clang
python waf clean_clang
displayName: clang build including tests
- script: |
set -euxo pipefail
python waf build_gcc -v
sudo python waf install_gcc
pushd build/gcc/tests
lua -e"_U=true" all.lua
# lua all.lua
popd
sudo python waf uninstall_gcc
python waf clean_gcc
displayName: gcc build including tests
- script: |
set -euxo pipefail
python waf distclean
displayName: distclean
- script: |
set -euxo pipefail
python waf configure --ltests --include-tests --prefix=/opt/lua -v
displayName: configure with tests and ltests
- script: |
set -euxo pipefail
python waf build_clang -v
sudo python waf install_clang
pushd build/clang/tests
lua -e"_U=true" all.lua
# lua all.lua
popd
sudo python waf uninstall_clang
python waf clean_clang
displayName: clang build including tests and ltests
- script: |
set -euxo pipefail
python waf build_gcc -v
sudo python waf install_gcc
pushd build/gcc/tests
lua -e"_U=true" all.lua
# lua all.lua
popd
sudo python waf uninstall_gcc
python waf clean_gcc
displayName: gcc build including tests and ltests
- script: |
set -euxo pipefail
python waf distclean
displayName: distclean
- job: Windows_Static_Program_Analysis
pool:
vmImage: "windows-2019"
displayName: "Static Program Analysis"
steps:
- task: UsePythonVersion@0
inputs:
versionSpec: "3.6"
addToPath: true
architecture: "x64"
- script: python -m pip install --upgrade pip
displayName: "Upgrad pip"
- script: python -m pip install --upgrade --requirement requirements.txt
displayName: "Install requirements.txt"
- script: |
python --version
black --version
pylint --version
displayName: Static Program Analysis Tools versions
- script: python waf --help
displayName: Unpack waf
- script: black . --config=pyproject.toml --check -v
displayName: Run black
- script: pylint --rcfile=pyproject.toml wscript
displayName: Run pylint wscript
- script: pylint --rcfile=pyproject.toml docs\conf.py
displayName: Run pylint docs\conf.py
- script: pylint --rcfile=pyproject.toml scripts\dot.py
displayName: Run pylint scripts\dot.py
- script: pylint --rcfile=pyproject.toml scripts\doxygen.py
displayName: Run pylint scripts\doxygen.py
- script: pylint --rcfile=pyproject.toml scripts\sphinx.py
displayName: Run pylint scripts\sphinx.py
Cirrus CI¶
Cirrus CI is configured by the .cirrus.yml file.
Cirrus CI configuration¶
task:
pip_cache:
folder: ~/.cache/pip
fingerprint_script: echo $CIRRUS_OS
matrix:
- container:
image: debian:10
install_script:
- export RUNLEVEL=1
- apt-get update
- apt-get install -y apt-utils lsb-release curl gnupg
- curl -o llvm-snapshot.gpg.key https://apt.llvm.org/llvm-snapshot.gpg.key
- cat llvm-snapshot.gpg.key
- apt-key add llvm-snapshot.gpg.key
- apt-get update
- lsb_release -a
- apt-get install -y dialog
- apt-get install -y software-properties-common libreadline7 libreadline-dev
- apt-add-repository "deb http://apt.llvm.org/buster/ llvm-toolchain-buster-10 main"
- apt-get update
- apt-get -y upgrade
- apt-get install -y build-essential doxygen graphviz python3-pip
- apt-get install -y clang-10 lld-10
- update-alternatives --install /usr/bin/clang clang /usr/bin/clang-10 100
- python3 -m pip install --upgrade --requirement requirements.txt
- container:
image: fedora:30
install_script:
- export RUNLEVEL=1
- dnf -y update
- dnf -y install redhat-lsb-core gcc clang python3-pip doxygen graphviz readline readline-devel
- lsb_release -a
- python3 -m pip install --upgrade --requirement requirements.txt
- container:
image: ubuntu:bionic
install_script:
- export RUNLEVEL=1
- apt-get update
- apt-get install -y apt-utils lsb-release curl gnupg
- curl -o llvm-snapshot.gpg.key https://apt.llvm.org/llvm-snapshot.gpg.key
- cat llvm-snapshot.gpg.key
- apt-key add llvm-snapshot.gpg.key
- apt-get update
- lsb_release -a
- apt-get install -y dialog python3-pip
- apt-get install -y software-properties-common libreadline7 libreadline-dev
- apt-add-repository "deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-9 main"
- apt-get update
- apt-get -y upgrade
- apt-get install -y build-essential doxygen graphviz
- apt-get install -y clang-9 lld-9
- update-alternatives --install /usr/bin/clang clang /usr/bin/clang-9 100
- python3 -m pip install --upgrade --requirement requirements.txt
- freebsd_instance:
image_family: freebsd-12-1
freebsd_install_script:
- pkg update -f
- env ASSUME_ALWAYS_YES=YES pkg bootstrap -f
- env ASSUME_ALWAYS_YES=YES pkg upgrade pkg
- env ASSUME_ALWAYS_YES=YES pkg install lang/gcc bash doxygen
- python3 -m ensurepip --default-pip
- python3 -m pip install --upgrade pip
- python3 -m pip install --upgrade --requirement requirements.txt
freebsd_setup_script:
- chsh -s /usr/local/bin/bash
version_script:
- python3 --version
- gcc --version
- clang --version
- doxygen --version
- dot -V
- sphinx-build --version
script:
# basic configuration
- python3 waf configure -v
# documentation build
- python3 waf build_docs
- python3 waf clean_docs
- python3 waf distclean
# configuration
- python3 waf configure --include-tests
# gcc [
- python3 waf build_gcc -v
- python3 waf install_gcc -v
- pushd build/gcc/tests
- lua -e"_U=true" all.lua
#- lua all.lua
- popd
- python3 waf uninstall_gcc
- python3 waf clean_gcc
# gcc ]
- python3 waf distclean
# including ltests
- python3 waf configure --ltests --include-tests
# gcc [
- python3 waf build_gcc -v
- python3 waf install_gcc -v
- pushd build/gcc/tests
- lua -e"_U=true" all.lua
#- lua all.lua
- popd
- python3 waf uninstall_gcc
- python3 waf clean_gcc
# gcc ]
# configuration
- python3 waf configure --include-tests
# clang [
- python3 waf build_clang -v
- python3 waf install_clang -v
- pushd build/clang/tests
- lua -e"_U=true" all.lua
#- lua all.lua
- popd
- python3 waf uninstall_clang
- python3 waf clean_clang
# clang ]
- python3 waf distclean
# including ltests
- python3 waf configure --ltests --include-tests
# clang [
- python3 waf build_clang -v
- python3 waf install_clang -v
- pushd build/clang/tests
- lua -e"_U=true" all.lua
#- lua all.lua
- popd
- python3 waf uninstall_clang
- python3 waf clean_clang
# clang ]
# test script
- python3 scripts/run_test.py -c gcc -c clang --simple-test
- python3 scripts/run_test.py -c gcc -c clang --simple-test --ltests
Travis CI¶
Travis CI is configured by the .travis.yml file.
Travis CI configuration¶
branches:
except:
- /^appveyor-.*$/
- /^azure.*$/
- /^cirrus-ci.*$/
env:
- NATIVE_LUA_CI_BUILD="TRUE"
addons:
apt:
update: true
packages:
- doxygen
- graphviz
cache: pip
matrix:
fast_finish: true
include:
- os: linux
dist: xenial
language: python
sudo: required
- os: linux
dist: bionic
language: python
sudo: required
# - os: linux
# arch: ppc64le
# language: python
# sudo: required
# - os: linux
# arch: s390x
# language: python
# sudo: required
# - os: linux
# arch: arm64
# language: python
# sudo: required
install:
- python3 -m pip install --upgrade --requirement requirements.txt
# - if [ "$TRAVIS_CPU_ARCH" != "amd64" ]; then sudo apt-get install python3-pip -y; fi
# - if [ "$TRAVIS_CPU_ARCH" != "amd64" ]; then sudo python3 -m pip install sphinx -q; fi
before_script:
- which gcc
- which clang
- echo $PATH
- python3 --version
- gcc --version
- clang --version
- doxygen --version
- sphinx-build --version
script:
- python3 waf configure -vv
# check documentation build
- python3 waf build_docs
- python3 waf clean_docs
- python3 waf distclean
- python3 waf configure --include-tests
# gcc [
- python3 waf build_gcc
- sudo python3 waf install_gcc
- pushd build/gcc/tests
- lua -e"_U=true" all.lua
- lua all.lua
- popd
- sudo python3 waf uninstall_gcc
- python3 waf clean_gcc
# gcc ]
# clang [
- python3 waf build_clang
- sudo python3 waf install_clang
- pushd build/clang/tests
- lua -e"_U=true" all.lua
- lua all.lua
- popd
- sudo python3 waf uninstall_clang
- python3 waf clean_clang
# clang ]
- python3 waf distclean
# including ltests
- python3 waf configure --ltests --include-tests
# gcc [
- python3 waf build_gcc
- sudo python3 waf install_gcc
- pushd build/gcc/tests
- lua -e"_U=true" all.lua
- lua all.lua
- popd
- sudo python3 waf uninstall_gcc
- python3 waf clean_gcc
# gcc ]
# clang [
- python3 waf build_clang
- sudo python3 waf install_clang
- pushd build/clang/tests
- lua -e"_U=true" all.lua
- lua all.lua
- popd
- sudo python3 waf uninstall_clang
- python3 waf clean_clang
# clang ]
- python3 waf distclean
# test script
- python3 scripts/run_test.py -c gcc -c clang --simple-test
- python3 scripts/run_test.py -c gcc -c clang
- python3 scripts/run_test.py -c gcc -c clang --simple-test --ltests
- python3 scripts/run_test.py -c gcc -c clang --ltests
Sources¶
License¶
For the Lua license information see the end of file lua.h:
int fidx2, int n2);
LUA_API void (lua_sethook) (lua_State *L, lua_Hook func, int mask, int count);
LUA_API lua_Hook (lua_gethook) (lua_State *L);
LUA_API int (lua_gethookmask) (lua_State *L);
LUA_API int (lua_gethookcount) (lua_State *L);
LUA_API int (lua_setcstacklimit) (lua_State *L, unsigned int limit);
struct lua_Debug {
int event;
const char *name; /* (n) */
const char *namewhat; /* (n) 'global', 'local', 'field', 'method' */
const char *what; /* (S) 'Lua', 'C', 'main', 'tail' */
const char *source; /* (S) */
size_t srclen; /* (S) */
int currentline; /* (l) */
int linedefined; /* (S) */
int lastlinedefined; /* (S) */
unsigned char nups; /* (u) number of upvalues */
unsigned char nparams;/* (u) number of parameters */
char isvararg; /* (u) */
Sources¶
Native Lua Sources¶
wscript¶
#!/usr/bin/env python
# encoding: utf-8
# SPDX-License-Identifier: MIT
# pylint: disable=unused-variable
import os
import re
import json
from waflib import Logs, Utils, Options, Context, TaskGen
from waflib.Tools.compiler_c import c_compiler
from waflib.Build import BuildContext, CleanContext, ListContext, StepContext
from waflib.Build import InstallContext, UninstallContext
VERSION = "0.5.0-devel"
APPNAME = "lua"
top = "." # pylint: disable=invalid-name
out = "build" # pylint: disable=invalid-name
Context.Context.line_just = 45
USE_ABSOLUTE_INCPATHS = ["\\Microsoft Visual Studio\\", "\\Windows Kits\\"]
@TaskGen.feature("c")
@TaskGen.after_method("apply_incpaths")
def make_msvc_and_win_paths_absolute(self):
incpaths_fixed = []
for inc_path in self.env.INCPATHS:
if any(i in inc_path for i in USE_ABSOLUTE_INCPATHS):
incpaths_fixed.append(os.path.abspath(inc_path))
else:
incpaths_fixed.append(inc_path)
self.env.INCPATHS = incpaths_fixed
host_os = Utils.unversioned_sys_platform() # pylint: disable=invalid-name
plat_comp = c_compiler["default"] # pylint: disable=invalid-name
if c_compiler.get(host_os):
plat_comp = c_compiler[host_os] # pylint: disable=invalid-name
else:
# add host compilers to compiler list. We need to do this, in order that we
# use c_compiler[host_os] everywhere we need it.
c_compiler[host_os] = plat_comp
for x in plat_comp + ["docs"]:
for y in (BuildContext, CleanContext):
NAME = y.__name__.replace("Context", "").lower()
class Tmp1(y):
__doc__ = y.__doc__ + " ({})".format(x)
cmd = NAME + "_" + x
variant = x
if x != "docs":
for y in (ListContext, StepContext, InstallContext, UninstallContext):
NAME = y.__name__.replace("Context", "").lower()
class Tmp2(y):
__doc__ = y.__doc__ + " ({})".format(x)
cmd = NAME + "_" + x
variant = x
if host_os == "win32":
os.environ["PREFIX"] = os.path.join(
os.environ.get("LOCALAPPDATA"), "Programs", "lua"
)
def options(opt):
opt.parser.remove_option("--top")
opt.parser.remove_option("--out")
opt.load("compiler_c")
opt.load("python")
opt.parser.remove_option("--nopyc")
opt.parser.remove_option("--nopyo")
opt.parser.remove_option("--nopycache")
opt.parser.remove_option("--pythondir")
opt.parser.remove_option("--pythonarchdir")
opt.load("gnu_dirs")
opt.parser.remove_option("--oldincludedir")
opt.parser.remove_option("--dvidir")
opt.parser.remove_option("--pdfdir")
opt.parser.remove_option("--infodir")
opt.parser.remove_option("--psdir")
opt.parser.remove_option("--localedir")
opt_gr = opt.get_option_group("Installation directories")
opt.add_option(
"--confcache",
dest="confcache",
default=0,
action="count",
help="Use a configuration cache",
)
opt.add_option(
"--include-tests",
dest="include_tests",
default=False,
action="store_true",
help="Include test files",
)
opt.add_option(
"--c-std",
dest="c_standard",
default="c99",
choices=["c89", "c99"],
help="Specify C-standard to be used. 'c99' is default. 'c99' will "
"be replaced by 'gnu99' for gcc, xlc and icc. 'c99' will be "
"replaced by 'c++14' for msvc. 'c89' is passed verbatim for "
"gcc, xlc, icc and clang. 'c89' will be replaced by 'c++14' "
"for msvc.",
)
opt.add_option(
"--ltests",
dest="ltests",
default=False,
action="store_true",
help="Building with 'ltests'",
)
opt.add_option(
"--generic",
dest="generic",
default=False,
action="store_true",
help="Build generic on the host platform. This is not supported on win32.",
)
def configure(conf): # pylint: disable=too-many-branches,too-many-locals
"""Basic configuration of the project based on the operating system and
the available compilers.
"""
conf.msg("Prefix", conf.env.PREFIX)
conf.load("python")
conf.check_python_version((3, 5))
conf.env.define_key.remove("PYTHONDIR")
conf.env.define_key.remove("PYTHONARCHDIR")
conf.load("sphinx", tooldir="scripts")
conf.load("doxygen", tooldir="scripts")
# check that all version numbers match and the the version number adheres
# to Semantic Versioning 2.0.0
# https://semver.org/spec/v2.0.0.html#is-there-a-suggested-regular-expression-regex-to-check-a-semver-string
sem_ver_re = re.compile(
r"^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*"
r"[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))"
r"*))?(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$"
)
is_sem_ver = re.match(sem_ver_re, VERSION)
if not is_sem_ver:
conf.fatal(
"Version information does not follow sematic versioning 2.0.0 ({})\n"
"See https://semver.org/spec/v2.0.0.html for details.".format(VERSION)
)
base_err_msg = (
"wscript's VERSION attribute ({}) and version information in file {} "
"({}) do not match."
)
version_file = conf.path.find_node("VERSION")
version_info = json.loads(version_file.read(encoding="utf-8"))
version_file_ver = version_info["native Lua"]
if not VERSION == version_file_ver:
conf.fatal(base_err_msg.format(VERSION, version_file, version_file_ver))
confpy_file = conf.path.find_node("docs/conf.py")
confpy_txt = confpy_file.read(encoding="utf-8")
confpy_file_ver = re.search(r'(version)( = )"(.{0,})"', confpy_txt).group(3)
if not VERSION == confpy_file_ver:
conf.fatal(base_err_msg.format(VERSION, confpy_file, confpy_file_ver))
readme_file = conf.path.find_node("README.md")
readme_txt = readme_file.read(encoding="utf-8")
readme_file_ver = re.search(r"(based on native Lua )\((.{0,})\)", readme_txt).group(
2
)
if not VERSION == readme_file_ver:
conf.fatal(base_err_msg.format(VERSION, readme_file, readme_file_ver))
start_file = conf.path.find_node("docs/start.rst")
start_txt = start_file.read(encoding="utf-8")
start_file_ver = re.search(r"(based on native Lua )\((.{0,})\)", start_txt).group(2)
if not VERSION == readme_file_ver:
conf.fatal(base_err_msg.format(VERSION, readme_file, readme_file_ver))
doxygen_file = conf.path.find_node("docs/doxygen.conf")
doxygen_txt = doxygen_file.read(encoding="utf-8")
doxygen_file_ver = re.search(
r'(PROJECT_NUMBER)( = )"(.{0,})"', doxygen_txt
).group(3)
if not VERSION == doxygen_file_ver:
conf.fatal(base_err_msg.format(VERSION, doxygen_file, doxygen_file_ver))
conf.env.lua_src_version = version_info["lua"]
conf.env.lua_tests_version = version_info["tests"]
conf.msg("native Lua version", VERSION)
conf.msg("Lua version", conf.env.lua_src_version)
conf.msg("Lua tests version", conf.env.lua_tests_version)
conf.msg("Including tests", conf.options.include_tests)
conf.msg("Using ltests", conf.options.ltests)
conf.env.generic = conf.options.generic
conf.msg("Generic", conf.env.generic)
def get_c_standard(env_name, c_std):
"""Define C standard for each compiler"""
c_std_string = None
if env_name in ("gcc", "xlc", "icc"):
pref = "-std="
if c_std == "c89":
c_std_string = "{}c89".format(pref)
if c_std == "c99":
c_std_string = "{}gnu99".format(pref)
elif env_name == "clang":
c_std_string = "-std={}".format(c_std)
elif env_name == "msvc":
c_std_string = "/std:c++14"
return c_std_string or (conf.fatal("Could not set C-standard"))
def set_new_basic_env(env_name):
"""Create a new environment based on the base environment"""
conf.setenv("")
tmp_env = conf.env.derive()
tmp_env.detach()
conf.setenv(env_name, tmp_env)
conf.env.env_name = env_name
c_compiler[host_os] = [conf.env.env_name]
conf.env.c_standard = get_c_standard(conf.env.env_name, conf.env.c_standard)
conf.path.get_bld().make_node(env_name).mkdir()
def check_libs(*libs):
for lib in libs:
conf.check(lib=lib, uselib_store=lib.upper())
conf.setenv("")
conf.env.host_os = host_os
conf.env.c_standard = conf.options.c_standard
conf.env.include_tests = conf.options.include_tests
conf.env.ltests = conf.options.ltests
conf.load("gnu_dirs")
min_c = "#include<stdio.h>\nint main() {\n return 0;\n}\n"
if conf.options.c_standard == "c89":
Logs.warn("C89 does not guarantee 64-bit integers for Lua.")
Logs.warn("Adding define: LUA_USE_C89") # TODO
if host_os == "win32":
Logs.warn("This will NOT effect msvc-builds on win32.")
conf.msg("C standard", conf.options.c_standard)
conf.env.WAF_CONFIG_H_PRELUDE = (
'#define NATIVE_LUA_PRE_MSG "based on native Lua"\n'
'#define NATIVE_LUA_VERSION "{}"\n'.format(VERSION) + ""
'#define NATIVE_LUA_REPO "https://github.com/swaldhoer/native-lua"\n'
'#define NATIVE_LUA_MSG " [" NATIVE_LUA_PRE_MSG " (" NATIVE_LUA_VERSION"), " NATIVE_LUA_REPO"]"'
)
platform_compilers = []
failed_platform_compilers = []
conf.write_config_header(configfile="waf_build_config.h")
if conf.options.generic:
if host_os == "win32":
Logs.info("Generic build uses msvc on win32")
try: # msvc
set_new_basic_env("msvc")
conf.load("compiler_c")
conf.env.CFLAGS = [
"/nologo",
conf.env.c_standard,
"/O2",
"/Wall",
"/Qspectre",
]
conf.env.CMCFLAGS = ["/Os"]
conf.check_cc(fragment=min_c, execute=True)
platform_compilers.append(conf.env.env_name)
conf.msg("Manifest", conf.env.MSVC_MANIFEST)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
else:
try:
# generic build only for gcc
Logs.info(
"Generic build on {} with gcc".format(
Utils.unversioned_sys_platform()
)
)
set_new_basic_env("gcc")
conf.load("compiler_c")
conf.env.CFLAGS = [conf.env.c_standard, "-O2", "-Wall", "-Wextra"]
conf.env.CMCFLAGS = ["-Os"]
conf.check_cc(fragment=min_c, execute=True)
check_libs("m")
platform_compilers.append(conf.env.env_name)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
elif host_os == "aix":
try: # xlc
set_new_basic_env("xlc")
conf.load("compiler_c")
conf.env.CFLAGS = [conf.env.c_standard, "-O2", "-Wall", "-Wextra"]
conf.env.CMCFLAGS = ["-Os"]
conf.env.LINKFLAGS = ["-Wl,-brtl,-bexpall"]
conf.check_cc(fragment=min_c, execute=True)
check_libs("m", "dl")
platform_compilers.append(conf.env.env_name)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
try: # gcc
# when compling with gcc, the xlc linker must still be used
set_new_basic_env("gcc")
conf.env.LINK_CC = "xlc"
conf.load("compiler_c")
conf.env.CFLAGS = [conf.env.c_standard, "-O2", "-Wall", "-Wextra"]
conf.env.CMCFLAGS = ["-Os"]
conf.env.LINKFLAGS = ["-Wl,-brtl,-bexpall"]
conf.check_cc(fragment=min_c, execute=True)
check_libs("m", "dl")
platform_compilers.append(conf.env.env_name)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
try: # clang
set_new_basic_env("gcc")
conf.load("compiler_c")
conf.env.CFLAGS = [conf.env.c_standard, "-O2", "-Wall", "-Wextra"]
conf.env.CMCFLAGS = ["-Os"]
conf.env.LINKFLAGS = ["-Wl,-brtl,-bexpall"]
conf.check_cc(fragment=min_c, execute=True)
check_libs("m", "dl")
platform_compilers.append(conf.env.env_name)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
elif host_os == "openbsd":
try: # gcc
set_new_basic_env("gcc")
conf.load("compiler_c")
conf.env.CFLAGS = [conf.env.c_standard, "-O2", "-Wall", "-Wextra"]
conf.env.CMCFLAGS = ["-Os"]
conf.env.LINKFLAGS = ["-Wl,-export-dynamic"]
conf.check_cc(fragment=min_c, execute=True)
check_libs("m")
platform_compilers.append(conf.env.env_name)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
try: # clang
set_new_basic_env("clang")
conf.load("compiler_c")
conf.env.CFLAGS = [conf.env.c_standard, "-O2", "-Wall", "-Wextra"]
conf.env.CMCFLAGS = ["-Os"]
conf.env.LINKFLAGS = ["-Wl,-export-dynamic"]
conf.check_cc(fragment=min_c, execute=True)
check_libs("m")
platform_compilers.append(conf.env.env_name)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
elif host_os == "netbsd":
try: # gcc
set_new_basic_env("gcc")
conf.load("compiler_c")
conf.env.CFLAGS = [conf.env.c_standard, "-O2", "-Wall", "-Wextra"]
conf.env.CMCFLAGS = ["-Os"]
conf.env.LINKFLAGS = ["-Wl,-export-dynamic"]
conf.check_cc(fragment=min_c, execute=True)
check_libs("m")
platform_compilers.append(conf.env.env_name)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
try: # clang
set_new_basic_env("clang")
conf.load("compiler_c")
conf.env.CFLAGS = [conf.env.c_standard, "-O2", "-Wall", "-Wextra"]
conf.env.CMCFLAGS = ["-Os"]
conf.env.LINKFLAGS = ["-Wl,-export-dynamic"]
conf.check_cc(fragment=min_c, execute=True)
check_libs("m")
platform_compilers.append(conf.env.env_name)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
elif host_os == "freebsd":
try: # gcc
set_new_basic_env("gcc")
conf.load("compiler_c")
conf.env.CC_VERSION_MAJOR = conf.env.CC_VERSION[0]
rpath = "/usr/local/lib/gcc" + conf.env.CC_VERSION_MAJOR
if not os.path.isdir(rpath):
Logs.warn(
"Could not validate rpath, as path {} "
"does not exist".format(rpath)
)
else:
conf.env.append_unique("RPATH", rpath)
conf.msg("RPATH", conf.env.RPATH[0])
conf.env.CFLAGS = [conf.env.c_standard, "-O2", "-Wall", "-Wextra"]
conf.env.CMCFLAGS = ["-Os"]
conf.env.LINKFLAGS = ["-Wl,-export-dynamic"]
conf.check_cc(fragment=min_c, execute=True)
check_libs("m", "dl", "edit")
platform_compilers.append(conf.env.env_name)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
try: # clang
set_new_basic_env("clang")
conf.load("compiler_c")
conf.env.CFLAGS = [conf.env.c_standard, "-O2", "-Wall", "-Wextra"]
conf.env.CMCFLAGS = ["-Os"]
conf.env.LINKFLAGS = ["-Wl,-export-dynamic"]
conf.check_cc(fragment=min_c, execute=True)
conf.env.append_unique("INCLUDES", "/usr/include/edit")
conf.env.append_unique("LIBPATH", "/usr/local/lib")
check_libs("m", "dl", "edit")
platform_compilers.append(conf.env.env_name)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
elif host_os == "linux":
try: # gcc
set_new_basic_env("gcc")
conf.load("compiler_c")
conf.env.CFLAGS = [conf.env.c_standard, "-O2", "-Wall", "-Wextra"]
conf.env.CMCFLAGS = ["-Os"]
conf.env.LINKFLAGS = ["-Wl,-export-dynamic"]
conf.check_cc(fragment=min_c, execute=True)
check_libs("m", "dl", "readline")
platform_compilers.append(conf.env.env_name)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
try: # clang
set_new_basic_env("clang")
conf.load("compiler_c")
conf.env.CFLAGS = [conf.env.c_standard, "-O2", "-Wall", "-Wextra"]
conf.env.CMCFLAGS = ["-Os"]
conf.env.LINKFLAGS = ["-Wl,-export-dynamic"]
conf.check_cc(fragment=min_c, execute=True)
check_libs("m", "dl", "readline")
platform_compilers.append(conf.env.env_name)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
try: # icc
set_new_basic_env("icc")
conf.load("compiler_c")
conf.env.CFLAGS = [conf.env.c_standard, "-O2", "-Wall", "-Wextra"]
conf.env.CMCFLAGS = ["-Os"]
conf.env.LINKFLAGS = ["-Wl,-export-dynamic"]
conf.check_cc(fragment=min_c, execute=True)
check_libs("m", "dl", "readline")
platform_compilers.append(conf.env.env_name)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
elif host_os == "darwin":
try: # gcc
set_new_basic_env("gcc")
conf.load("compiler_c")
conf.env.CFLAGS = [conf.env.c_standard, "-O2", "-Wall", "-Wextra"]
conf.env.CMCFLAGS = ["-Os"]
conf.check_cc(fragment=min_c, execute=True)
check_libs("m", "readline")
platform_compilers.append(conf.env.env_name)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
try: # clang
set_new_basic_env("clang")
conf.load("compiler_c")
conf.env.CFLAGS = [conf.env.c_standard, "-O2", "-Wall", "-Wextra"]
conf.env.CMCFLAGS = ["-Os"]
conf.check_cc(fragment=min_c, execute=True)
check_libs("m", "readline")
platform_compilers.append(conf.env.env_name)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
elif host_os == "win32":
try: # msvc
set_new_basic_env("msvc")
conf.load("compiler_c")
conf.env.CFLAGS = [
"/nologo",
conf.env.c_standard,
"/O2",
"/Wall",
"/Qspectre",
]
conf.env.CMCFLAGS = ["/Os"]
conf.check_cc(fragment=min_c, execute=True)
platform_compilers.append(conf.env.env_name)
conf.msg("Manifest", conf.env.MSVC_MANIFEST)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
try: # gcc
set_new_basic_env("gcc")
conf.load("compiler_c")
conf.env.CFLAGS = [conf.env.c_standard, "-O2", "-Wall", "-Wextra"]
conf.env.CMCFLAGS = ["-Os"]
conf.check_cc(fragment=min_c, execute=True)
check_libs("m")
platform_compilers.append(conf.env.env_name)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
try: # clang
set_new_basic_env("clang")
conf.load("compiler_c")
conf.env.CFLAGS = [conf.env.c_standard, "-O2", "-Wall", "-Wextra"]
conf.env.CMCFLAGS = ["-Os"]
# these vars fix the luac build
conf.env.cstlib_PATTERN = "%s.lib"
conf.env.LINKFLAGS = []
conf.env.STLIB_MARKER = ""
conf.env.SHLIB_MARKER = ""
# these vars fix the lua build
conf.env.IMPLIB_ST = "-IMPLIB:%s"
conf.env.implib_PATTERN = "%s.dll"
conf.check_cc(fragment=min_c, execute=True)
platform_compilers.append(conf.env.env_name)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
elif host_os == "cygwin":
try: # gcc
set_new_basic_env("gcc")
conf.load("compiler_c")
conf.env.CFLAGS = [conf.env.c_standard, "-O2", "-Wall", "-Wextra"]
conf.env.CMCFLAGS = ["-Os"]
conf.env.LINKFLAGS = ["-Wl,--export-all-symbols"]
conf.check_cc(fragment=min_c, execute=True)
check_libs("m")
platform_compilers.append(conf.env.env_name)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
try: # clang
set_new_basic_env("clang")
conf.load("compiler_c")
conf.env.CFLAGS = [conf.env.c_standard, "-O2", "-Wall", "-Wextra"]
conf.env.CMCFLAGS = ["-Os"]
conf.env.LINKFLAGS = ["-Wl,--export-all-symbols"]
conf.check_cc(fragment=min_c, execute=True)
check_libs("m")
platform_compilers.append(conf.env.env_name)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
elif host_os == "solaris":
try: # gcc
set_new_basic_env("gcc")
conf.load("compiler_c")
conf.env.CFLAGS = [conf.env.c_standard, "-O2", "-Wall", "-Wextra"]
conf.env.CMCFLAGS = ["-Os"]
conf.env.LINKFLAGS = ["-Wl,-export-dynamic"]
conf.check_cc(fragment=min_c, execute=True)
check_libs("m", "dl")
platform_compilers.append(conf.env.env_name)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
try: # gcc
set_new_basic_env("clang")
conf.load("compiler_c")
conf.env.CFLAGS = [conf.env.c_standard, "-O2", "-Wall", "-Wextra"]
conf.env.CMCFLAGS = ["-Os"]
conf.env.LINKFLAGS = ["-Wl,-export-dynamic"]
conf.check_cc(fragment=min_c, execute=True)
check_libs("m", "dl")
platform_compilers.append(conf.env.env_name)
except BaseException:
failed_platform_compilers.append(conf.env.env_name)
else:
Logs.warn("Building generic for platform: {}".format(host_os))
if not platform_compilers:
conf.fatal(
"Could not configure a single C compiler (tried: {}).\
".format(
failed_platform_compilers
)
)
if failed_platform_compilers:
Logs.warn(
"Could not configure the following compilers: {}".format(
", ".join(failed_platform_compilers)
)
)
c_compiler[host_os] = platform_compilers
conf.msg("Configured compilers", ", ".join(c_compiler[host_os]))
def build(bld):
"""Wrapper for the compiler specific build"""
# check correct build commands
if not bld.variant:
if bld.cmd == "clean":
Logs.warn("Cleaning for all platforms")
Options.commands = ["clean_{}".format(t_cc) for t_cc in c_compiler[host_os]]
Options.commands.append("clean_doc")
return
if bld.cmd == "build":
bld.fatal(
"Use a build variant: {}".format(
" ".join("build_" + t_cc for t_cc in c_compiler[host_os] + ["docs"])
)
)
bld.clean_files = bld.bldnode.ant_glob(
"**", excl=".lock* config.log c4che/* build.log", quiet=True, generator=True
)
# check that the binary is available in PATH
if bld.cmd.startswith("install"):
bin_dir = Utils.subst_vars(bld.env.BINDIR, bld.env)
if not any(
[x if x == bin_dir else False for x in os.environ["PATH"].split(os.pathsep)]
):
Logs.warn("lua is not in available in PATH.")
Logs.warn("Add the following path to PATH: {}".format(bin_dir))
# setup install files
if Utils.is_win32:
if bld.variant == "gcc":
# the DLL produced by gcc is already installed to ${BINDIR}
pass
if bld.variant == "msvc":
bininst = bld.path.get_bld().ant_glob("*.dll **/*.manifest", quiet=True)
libinst = []
if bld.env.MSVC_MANIFEST:
bininst += bld.path.get_bld().ant_glob("**/*.manifest", quiet=True)
libinst += bld.path.get_bld().ant_glob("**/*dll.manifest", quiet=True)
bld.install_files("${BINDIR}", bininst)
bld.install_files("${LIBDIR}", libinst)
else:
# man files do not make sense on win32
bld.install_files(
"${MANDIR}/man1",
[
bld.path.find_node(os.path.join("docs", "_static", "doc", "lua.1")),
bld.path.find_node(os.path.join("docs", "_static", "doc", "luac.1")),
],
)
include_files = [
bld.path.find_node(os.path.join("src", "lua.h")),
bld.path.find_node(os.path.join("src", "luaconf.h")),
bld.path.find_node(os.path.join("src", "lualib.h")),
bld.path.find_node(os.path.join("src", "lauxlib.h")),
bld.path.find_node(os.path.join("src", "lua.hpp")),
]
for incfile in include_files:
bld.install_files("${INCLUDEDIR}", incfile)
# actual binary and documentation builds
bld.env.append_unique("INCLUDES", bld.path.get_bld().parent.abspath())
bld.env.src_basepath = "src"
bld.env.sources = " ".join(
[
os.path.join(bld.env.src_basepath, "lapi.c"),
os.path.join(bld.env.src_basepath, "ldo.c"),
os.path.join(bld.env.src_basepath, "lctype.c"),
os.path.join(bld.env.src_basepath, "ldebug.c"),
os.path.join(bld.env.src_basepath, "ldump.c"),
os.path.join(bld.env.src_basepath, "lfunc.c"),
os.path.join(bld.env.src_basepath, "lgc.c"),
os.path.join(bld.env.src_basepath, "lmem.c"),
os.path.join(bld.env.src_basepath, "lobject.c"),
os.path.join(bld.env.src_basepath, "lopcodes.c"),
os.path.join(bld.env.src_basepath, "lstate.c"),
os.path.join(bld.env.src_basepath, "lstring.c"),
os.path.join(bld.env.src_basepath, "ltable.c"),
os.path.join(bld.env.src_basepath, "ltm.c"),
os.path.join(bld.env.src_basepath, "lundump.c"),
os.path.join(bld.env.src_basepath, "lvm.c"),
os.path.join(bld.env.src_basepath, "lzio.c"),
os.path.join(bld.env.src_basepath, "lauxlib.c"),
os.path.join(bld.env.src_basepath, "lbaselib.c"),
os.path.join(bld.env.src_basepath, "lcorolib.c"),
os.path.join(bld.env.src_basepath, "ldblib.c"),
os.path.join(bld.env.src_basepath, "liolib.c"),
os.path.join(bld.env.src_basepath, "lmathlib.c"),
os.path.join(bld.env.src_basepath, "loslib.c"),
os.path.join(bld.env.src_basepath, "lstrlib.c"),
os.path.join(bld.env.src_basepath, "ltablib.c"),
os.path.join(bld.env.src_basepath, "lutf8lib.c"),
os.path.join(bld.env.src_basepath, "loadlib.c"),
os.path.join(bld.env.src_basepath, "linit.c"),
]
)
bld.env.compiler_module_sources = [
os.path.join(bld.env.src_basepath, "lcode.c"),
os.path.join(bld.env.src_basepath, "llex.c"),
os.path.join(bld.env.src_basepath, "lparser.c"),
]
bld.env.source_interpreter = os.path.join(bld.env.src_basepath, "lua.c")
bld.env.source_compiler = os.path.join(bld.env.src_basepath, "luac.c")
bld.env.tests_basepath = "tests"
bld.env.ltests_dir = os.path.join(bld.env.tests_basepath, "ltests")
bld.env.ltests_sources = os.path.join(bld.env.ltests_dir, "ltests.c")
test_files = bld.path.ant_glob(bld.env.tests_basepath + "/**/*.lua")
bld.env.test_files = [t.path_from(bld.path) for t in test_files]
bld.env.libs_path = os.path.join(bld.env.tests_basepath, "libs")
bld.env.library_test = [
(os.path.join(bld.env.libs_path, "lib1.c"), "1"),
(os.path.join(bld.env.libs_path, "lib11.c"), "11"),
(os.path.join(bld.env.libs_path, "lib2.c"), "2"),
(os.path.join(bld.env.libs_path, "lib22.c"), "2-v2"),
(os.path.join(bld.env.libs_path, "lib21.c"), "21"),
]
if bld.variant == "docs":
source = [
bld.path.find_node("docs/changelog.rst"),
bld.path.find_node("docs/api.rst"),
bld.path.find_node("docs/build/wscript.rst"),
bld.path.find_node("docs/build.rst"),
bld.path.find_node("docs/ci.rst"),
bld.path.find_node("docs/contributing.rst"),
bld.path.find_node("docs/demos.rst"),
bld.path.find_node("docs/install.rst"),
bld.path.find_node("docs/license.rst"),
bld.path.find_node("docs/manual.rst"),
bld.path.find_node("docs/sources.rst"),
bld.path.find_node("docs/start.rst"),
bld.path.find_node("docs/test.rst"),
bld.path.find_node("docs/src/lapi.rst"),
bld.path.find_node("docs/src/lauxlib.rst"),
bld.path.find_node("docs/src/lbaselib.rst"),
bld.path.find_node("docs/src/lcode.rst"),
bld.path.find_node("docs/src/lcorolib.rst"),
bld.path.find_node("docs/src/lctype.rst"),
bld.path.find_node("docs/src/ldblib.rst"),
bld.path.find_node("docs/src/ldebug.rst"),
bld.path.find_node("docs/src/ldo.rst"),
bld.path.find_node("docs/src/ldump.rst"),
bld.path.find_node("docs/src/lfunc.rst"),
bld.path.find_node("docs/src/lgc.rst"),
bld.path.find_node("docs/src/linit.rst"),
bld.path.find_node("docs/src/liolib.rst"),
bld.path.find_node("docs/src/llex.rst"),
bld.path.find_node("docs/src/llimits.rst"),
bld.path.find_node("docs/src/lmathlib.rst"),
bld.path.find_node("docs/src/lmem.rst"),
bld.path.find_node("docs/src/loadlib.rst"),
bld.path.find_node("docs/src/lobject.rst"),
bld.path.find_node("docs/src/lopcodes.rst"),
bld.path.find_node("docs/src/loslib.rst"),
bld.path.find_node("docs/src/lparser.rst"),
bld.path.find_node("docs/src/lprefix.rst"),
bld.path.find_node("docs/src/lstate.rst"),
bld.path.find_node("docs/src/lstring.rst"),
bld.path.find_node("docs/src/lstrlib.rst"),
bld.path.find_node("docs/src/ltable.rst"),
bld.path.find_node("docs/src/ltablib.rst"),
bld.path.find_node("docs/src/ltm.rst"),
bld.path.find_node("docs/src/lua.rst"),
bld.path.find_node("docs/src/luac.rst"),
bld.path.find_node("docs/src/luaconf.rst"),
bld.path.find_node("docs/src/lualib.rst"),
bld.path.find_node("docs/src/lundump.rst"),
bld.path.find_node("docs/src/lutf8lib.rst"),
bld.path.find_node("docs/src/lvm.rst"),
bld.path.find_node("docs/src/lzio.rst"),
bld.path.find_node("docs/tests/all.rst"),
bld.path.find_node("docs/tests/api.rst"),
bld.path.find_node("docs/tests/attrib.rst"),
bld.path.find_node("docs/tests/big.rst"),
bld.path.find_node("docs/tests/bitwise.rst"),
bld.path.find_node("docs/tests/calls.rst"),
bld.path.find_node("docs/tests/closure.rst"),
bld.path.find_node("docs/tests/code.rst"),
bld.path.find_node("docs/tests/constructs.rst"),
bld.path.find_node("docs/tests/coroutine.rst"),
bld.path.find_node("docs/tests/db.rst"),
bld.path.find_node("docs/tests/errors.rst"),
bld.path.find_node("docs/tests/events.rst"),
bld.path.find_node("docs/tests/files.rst"),
bld.path.find_node("docs/tests/gc.rst"),
bld.path.find_node("docs/tests/goto.rst"),
bld.path.find_node("docs/tests/libs/lib1.rst"),
bld.path.find_node("docs/tests/libs/lib11.rst"),
bld.path.find_node("docs/tests/libs/lib2.rst"),
bld.path.find_node("docs/tests/libs/lib21.rst"),
bld.path.find_node("docs/tests/libs.rst"),
bld.path.find_node("docs/tests/literals.rst"),
bld.path.find_node("docs/tests/locals.rst"),
bld.path.find_node("docs/tests/ltests/ltests.rst"),
bld.path.find_node("docs/tests/ltests.rst"),
bld.path.find_node("docs/tests/main.rst"),
bld.path.find_node("docs/tests/math.rst"),
bld.path.find_node("docs/tests/nextvar.rst"),
bld.path.find_node("docs/tests/pm.rst"),
bld.path.find_node("docs/tests/sort.rst"),
bld.path.find_node("docs/tests/strings.rst"),
bld.path.find_node("docs/tests/tpack.rst"),
bld.path.find_node("docs/tests/utf8.rst"),
bld.path.find_node("docs/tests/vararg.rst"),
bld.path.find_node("docs/tests/verybig.rst"),
bld.path.find_node("docs/index.rst"),
]
bld(features="sphinx", source=source, confpy="docs/conf.py", buildername="html")
bld(features="doxygen", conf="docs/doxygen.conf")
else:
if bld.env.generic:
build_generic(bld)
elif bld.env.host_os == "aix":
build_aix(bld)
elif bld.env.host_os == "openbsd":
build_openbsd(bld)
elif bld.env.host_os == "netbsd":
build_netbsd(bld)
elif bld.env.host_os == "freebsd":
build_freebsd(bld)
elif bld.env.host_os == "linux":
build_linux(bld)
elif bld.env.host_os == "darwin":
build_darwin(bld)
elif bld.env.host_os == "win32":
build_win32(bld)
elif bld.env.host_os == "cygwin":
build_cygwin(bld)
elif bld.env.host_os == "solaris":
build_solaris(bld)
else:
bld.fatal("currently not supported platform")
if bld.env.include_tests:
bld(
features="subst",
source=bld.env.test_files,
target=bld.env.test_files,
is_copy=True,
)
def build_generic(bld):
use = ["M"]
use_ltests = []
defines = ["LUA_COMPAT_5_2"]
defines_tests = []
cflags = []
includes = []
if bld.env.c_standard.endswith("89"):
defines_c89 = ["LUA_USE_C89"]
defines_tests += defines_c89
defines += defines_c89
if bld.env.ltests:
use_ltests += ["LTESTS"]
cflags += ["-g"]
defines += ['LUA_USER_H="ltests.h"']
includes += [bld.env.ltests_dir]
bld.objects(
source=bld.env.ltests_sources,
defines=defines,
cflags=cflags,
includes=[bld.env.ltests_dir, bld.env.src_basepath],
name="LTESTS",
)
bld.stlib(
source=bld.env.sources,
target="lua",
defines=defines,
cflags=cflags,
use=use_ltests,
includes=includes,
name="static-lua-library",
)
bld.program(
source=bld.env.source_interpreter,
target="lua",
defines=defines,
cflags=cflags,
includes=includes,
use=["static-lua-library"] + use + use_ltests,
)
bld.program(
source=bld.env.source_compiler,
target="luac",
defines=defines,
cflags=cflags,
includes=includes,
use=["static-lua-library"] + use + use_ltests,
)
if bld.env.include_tests:
build_lib_tests(bld, defines_tests)
def build_aix(bld):
use = ["M", "DL"]
use_ltests = []
defines = ["LUA_COMPAT_5_2", "LUA_USE_POSIX", "LUA_USE_DLOPEN"]
defines_tests = []
cflags = []
includes = []
bld.fatal("TODO")
def build_openbsd(bld):
use = ["M"]
use_ltests = []
defines = ["LUA_COMPAT_5_2", "LUA_USE_POSIX", "LUA_USE_DLOPEN"]
defines_tests = []
cflags = []
includes = []
if bld.env.c_standard.endswith("89"):
defines_c89 = ["LUA_USE_C89"]
defines_tests += defines_c89
defines += defines_c89
if bld.env.ltests:
use_ltests += ["LTESTS"]
cflags += ["-g"]
defines += ['LUA_USER_H="ltests.h"']
includes += [bld.env.ltests_dir]
bld.objects(
source=bld.env.ltests_sources,
defines=defines,
cflags=cflags,
includes=[bld.env.ltests_dir, bld.env.src_basepath],
name="LTESTS",
)
bld.objects(
source=bld.env.compiler_module_sources,
target="cm_objects",
defines=defines,
cflags=bld.env.CMCFLAGS,
includes=includes,
)
bld.stlib(
source=bld.env.sources,
target="lua",
defines=defines,
cflags=cflags,
use=use_ltests + ["cm_objects"],
includes=includes,
name="static-lua-library",
)
bld.program(
source=bld.env.source_interpreter,
target="lua",
defines=defines,
cflags=cflags,
includes=includes,
use=["static-lua-library"] + use + use_ltests,
)
bld.program(
source=bld.env.source_compiler,
target="luac",
defines=defines,
cflags=cflags,
includes=includes,
use=["static-lua-library"] + use + use_ltests,
)
if bld.env.include_tests:
build_lib_tests(bld, defines_tests)
def build_netbsd(bld):
use = ["M"]
use_ltests = []
defines = ["LUA_COMPAT_5_2", "LUA_USE_POSIX", "LUA_USE_DLOPEN"]
defines_tests = []
cflags = []
includes = []
if bld.env.c_standard.endswith("89"):
defines_c89 = ["LUA_USE_C89"]
defines_tests += defines_c89
defines += defines_c89
if bld.env.ltests:
use_ltests += ["LTESTS"]
cflags += ["-g"]
defines += ['LUA_USER_H="ltests.h"']
includes += [bld.env.ltests_dir]
bld.objects(
source=bld.env.ltests_sources,
defines=defines,
cflags=cflags,
includes=[bld.env.ltests_dir, bld.env.src_basepath],
name="LTESTS",
)
bld.objects(
source=bld.env.compiler_module_sources,
target="cm_objects",
defines=defines,
cflags=bld.env.CMCFLAGS,
includes=includes,
)
bld.stlib(
source=bld.env.sources,
target="lua",
defines=defines,
cflags=cflags,
use=use_ltests + ["cm_objects"],
includes=includes,
name="static-lua-library",
)
bld.program(
source=bld.env.source_interpreter,
target="lua",
defines=defines,
cflags=cflags,
includes=includes,
use=["static-lua-library"] + use + use_ltests,
)
bld.program(
source=bld.env.source_compiler,
target="luac",
defines=defines,
cflags=cflags,
includes=includes,
use=["static-lua-library"] + use + use_ltests,
)
if bld.env.include_tests:
build_lib_tests(bld, defines_tests)
def build_freebsd(bld):
use = ["M", "DL", "EDIT"]
use_ltests = []
defines = ["LUA_COMPAT_5_2", "LUA_USE_LINUX"]
defines_tests = []
cflags = []
includes = []
if bld.env.c_standard.endswith("89"):
defines_c89 = ["LUA_USE_C89"]
defines_tests += defines_c89
defines += defines_c89
if bld.env.ltests:
use_ltests += ["LTESTS"]
cflags += ["-g"]
defines += ['LUA_USER_H="ltests.h"']
includes += [bld.env.ltests_dir]
bld.objects(
source=bld.env.ltests_sources,
defines=defines,
cflags=cflags,
includes=[bld.env.ltests_dir, bld.env.src_basepath],
name="LTESTS",
)
bld.objects(
source=bld.env.compiler_module_sources,
target="cm_objects",
defines=defines,
cflags=bld.env.CMCFLAGS,
includes=includes,
)
bld.stlib(
source=bld.env.sources,
target="lua",
defines=defines,
cflags=cflags,
use=use_ltests + ["cm_objects"],
includes=includes,
name="static-lua-library",
)
bld.program(
source=bld.env.source_interpreter,
target="lua",
defines=defines,
cflags=cflags,
includes=includes,
use=["static-lua-library"] + use + use_ltests,
)
bld.program(
source=bld.env.source_compiler,
target="luac",
defines=defines,
cflags=cflags,
includes=includes,
use=["static-lua-library"] + use + use_ltests,
)
if bld.env.include_tests:
build_lib_tests(bld, defines_tests)
def build_linux(bld):
use = ["M", "DL", "READLINE"]
use_ltests = []
defines = ["LUA_COMPAT_5_2", "LUA_USE_LINUX"]
defines_tests = []
cflags = []
includes = []
if bld.env.c_standard.endswith("89"):
defines_c89 = ["LUA_USE_C89"]
defines_tests += defines_c89
defines += defines_c89
if bld.env.ltests:
use_ltests += ["LTESTS"]
cflags += ["-g"]
defines += ['LUA_USER_H="ltests.h"']
includes += [bld.env.ltests_dir]
bld.objects(
source=bld.env.ltests_sources,
defines=defines,
cflags=cflags,
includes=[bld.env.ltests_dir, bld.env.src_basepath],
name="LTESTS",
)
bld.objects(
source=bld.env.compiler_module_sources,
target="cm_objects",
defines=defines,
cflags=bld.env.CMCFLAGS,
includes=includes,
)
bld.stlib(
source=bld.env.sources,
target="lua",
defines=defines,
cflags=cflags,
use=use_ltests + ["cm_objects"],
includes=includes,
name="static-lua-library",
)
bld.program(
source=bld.env.source_interpreter,
target="lua",
defines=defines,
cflags=cflags,
includes=includes,
use=["static-lua-library"] + use + use_ltests,
)
bld.program(
source=bld.env.source_compiler,
target="luac",
defines=defines,
cflags=cflags,
includes=includes,
use=["static-lua-library"] + use + use_ltests,
)
if bld.env.include_tests:
build_lib_tests(bld, defines_tests)
def build_darwin(bld):
use = ["M", "READLINE"]
use_ltests = []
defines = ["LUA_COMPAT_5_2", "LUA_USE_MACOSX"]
defines_tests = []
cflags = []
includes = []
if bld.env.c_standard.endswith("89"):
defines_c89 = ["LUA_USE_C89"]
defines_tests += defines_c89
defines += defines_c89
if bld.env.ltests:
use_ltests += ["LTESTS"]
cflags += ["-g"]
defines += ['LUA_USER_H="ltests.h"']
includes += [bld.env.ltests_dir]
bld.objects(
source=bld.env.ltests_sources,
defines=defines,
cflags=cflags,
includes=[bld.env.ltests_dir, bld.env.src_basepath],
name="LTESTS",
)
bld.objects(
source=bld.env.compiler_module_sources,
target="cm_objects",
defines=defines,
cflags=bld.env.CMCFLAGS,
includes=includes,
)
bld.stlib(
source=bld.env.sources,
target="lua",
defines=defines,
cflags=cflags,
use=use_ltests + ["cm_objects"],
includes=includes,
name="static-lua-library",
)
bld.program(
source=bld.env.source_interpreter,
target="lua",
defines=defines,
cflags=cflags,
includes=includes,
use=["static-lua-library"] + use + use_ltests,
)
bld.program(
source=bld.env.source_compiler,
target="luac",
defines=defines,
cflags=cflags,
includes=includes,
use=["static-lua-library"] + use + use_ltests,
)
if bld.env.include_tests and 0:
# https://github.com/swaldhoer/native-lua/issues/44
build_lib_tests(bld, defines_tests)
def build_win32(bld):
def build_win32_msvc():
"""Building on win32 with msvc"""
defines = ["LUA_COMPAT_5_2", "_WIN32"]
bld(
features="c",
source=bld.env.compiler_module_sources,
target="cm_objects",
defines=defines,
cflags=bld.env.CMCFLAGS,
)
bld.stlib(
source=bld.env.sources,
target="lua",
defines=defines,
use=["cm_objects"],
name="static-lua-library",
)
bld.shlib(
source=bld.env.sources,
target="luadll",
defines=defines + ["LUA_BUILD_AS_DLL"],
use=["cm_objects"],
name="shared-lua-library",
)
bld.program(
source=bld.env.source_interpreter,
target="lua",
defines=defines,
use=["shared-lua-library"],
)
bld.program(
source=bld.env.source_compiler,
target="luac",
defines=defines,
use=["static-lua-library"],
)
if bld.env.include_tests:
pass
# https://github.com/swaldhoer/native-lua/issues/46
def build_win32_gcc():
use = ["M"]
use_ltests = []
defines = ["LUA_COMPAT_5_2", "_WIN32"]
defines_tests = []
cflags = []
includes = []
bld(
features="c",
source=bld.env.compiler_module_sources,
target="cm_objects",
defines=defines,
cflags=cflags + bld.env.CMCFLAGS,
use=use_ltests,
includes=includes,
)
bld.stlib(
source=bld.env.sources,
target="lua",
defines=defines,
use=["cm_objects"],
name="static-lua-library",
)
bld.shlib(
source=bld.env.sources,
target="luadll",
defines=defines + ["LUA_BUILD_AS_DLL"],
use=["cm_objects"],
name="shared-lua-library",
)
bld.program(
source=bld.env.source_interpreter,
target="lua",
use=["shared-lua-library"] + use,
)
bld.program(
source=bld.env.source_compiler,
target="luac",
defines=defines,
use=["static-lua-library"] + use,
)
if bld.env.include_tests:
pass
# https://github.com/swaldhoer/native-lua/issues/46
def build_win32_clang():
use = ["M"]
use_ltests = []
defines = ["LUA_COMPAT_5_2", "_WIN32"]
defines_tests = []
cflags = []
includes = []
bld(
features="c",
source=bld.env.compiler_module_sources,
target="cm_objects",
defines=defines,
cflags=cflags + bld.env.CMCFLAGS,
use=use_ltests,
includes=includes,
)
bld.stlib(
source=bld.env.sources,
target="lua",
defines=defines,
use=["cm_objects"],
name="static-lua-library",
)
bld.shlib(
source=bld.env.sources,
target="luadll",
defines=defines + ["LUA_BUILD_AS_DLL"],
use=["cm_objects"],
name="shared-lua-library",
)
bld.program(
source=bld.env.source_interpreter,
target="lua",
use=["shared-lua-library"] + use,
)
bld.program(
source=bld.env.source_compiler,
target="luac",
defines=defines,
use=["static-lua-library"] + use,
)
if bld.env.include_tests and 0:
# https://github.com/swaldhoer/native-lua/issues/46
build_lib_tests(bld, defines_tests)
if bld.env.CC_NAME == "msvc":
build_win32_msvc()
elif bld.env.CC_NAME == "gcc":
build_win32_gcc()
elif bld.env.CC_NAME == "clang":
build_win32_clang()
def build_cygwin(bld):
use = ["M"]
use_ltests = []
defines = ["LUA_COMPAT_5_2", "LUA_USE_LINUX"]
defines_tests = []
cflags = []
includes = []
bld.objects(
source=bld.env.compiler_module_sources,
target="cm_objects",
defines=defines,
cflags=bld.env.CMCFLAGS,
)
bld.stlib(
source=bld.env.sources,
target="lua",
defines=defines,
use=["cm_objects"],
name="static-lua-library",
)
bld.shlib(
source=bld.env.sources,
target="luadll",
defines=defines + ["LUA_BUILD_AS_DLL"],
use=["cm_objects"],
name="shared-lua-library",
)
bld.program(
source=bld.env.source_interpreter,
target="lua",
use=["shared-lua-library"] + use,
)
bld.program(
source=bld.env.source_compiler,
target="luac",
defines=defines,
use=["static-lua-library"] + use,
)
def build_solaris(bld):
use = ["M", "DL"]
use_ltests = []
defines = ["LUA_COMPAT_5_2", "LUA_USE_POSIX", "LUA_USE_DLOPEN", "_REENTRANT"]
defines_tests = []
cflags = []
includes = []
if bld.env.c_standard.endswith("89"):
defines_c89 = ["LUA_USE_C89"]
defines_tests += defines_c89
defines += defines_c89
if bld.env.ltests:
use_ltests += ["LTESTS"]
cflags += ["-g"]
defines += ['LUA_USER_H="ltests.h"']
includes += [bld.env.ltests_dir]
bld.objects(
source=bld.env.ltests_sources,
defines=defines,
cflags=cflags,
includes=[bld.env.ltests_dir, bld.env.src_basepath],
name="LTESTS",
)
bld.objects(
source=bld.env.compiler_module_sources,
target="cm_objects",
defines=defines,
cflags=bld.env.CMCFLAGS,
includes=includes,
)
bld.stlib(
source=bld.env.sources,
target="lua",
defines=defines,
cflags=cflags,
use=use_ltests + ["cm_objects"],
includes=includes,
name="static-lua-library",
)
bld.program(
source=bld.env.source_interpreter,
target="lua",
defines=defines,
cflags=cflags,
includes=includes,
use=["static-lua-library"] + use + use_ltests,
)
bld.program(
source=bld.env.source_compiler,
target="luac",
defines=defines,
cflags=cflags,
includes=includes,
use=["static-lua-library"] + use + use_ltests,
)
if bld.env.include_tests:
build_lib_tests(bld, defines_tests)
def build_lib_tests(bld, defines_tests):
bld.path.get_bld().make_node(
os.path.join(bld.env.tests_basepath, "libs", "P1")
).mkdir()
for src, tgt in bld.env.library_test:
outfile = os.path.join(bld.env.tests_basepath, "libs", tgt)
bld.shlib(
source=src,
target=outfile,
defines=defines_tests,
includes=os.path.abspath(
os.path.join(bld.path.abspath(), bld.env.src_basepath)
),
)
Lua Sources¶
Lua Implementation¶
LAPI¶
/*
** $Id: lapi.h $
** Auxiliary functions from Lua API
** See Copyright Notice in lua.h
*/
#ifndef lapi_h
#define lapi_h
#include "llimits.h"
#include "lstate.h"
#include "_native_lua_config.h" /* native Lua */
/* Increments 'L->top', checking for stack overflows */
#define api_incr_top(L) {L->top++; api_check(L, L->top <= L->ci->top, \
"stack overflow");}
/*
** If a call returns too many multiple returns, the callee may not have
** stack space to accommodate all results. In this case, this macro
** increases its stack space ('L->ci->top').
*/
#define adjustresults(L,nres) \
{ if ((nres) <= LUA_MULTRET && L->ci->top < L->top) L->ci->top = L->top; }
/* Ensure the stack has at least 'n' elements */
#define api_checknelems(L,n) api_check(L, (n) < (L->top - L->ci->func), \
"not enough elements in the stack")
/*
** To reduce the overhead of returning from C functions, the presence of
** to-be-closed variables in these functions is coded in the CallInfo's
** field 'nresults', in a way that functions with no to-be-closed variables
** with zero, one, or "all" wanted results have no overhead. Functions
** with other number of wanted results, as well as functions with
** variables to be closed, have an extra check.
*/
#define hastocloseCfunc(n) ((n) < LUA_MULTRET)
#define codeNresults(n) (-(n) - 3)
#endif
/*
** $Id: lapi.c $
** Lua API
** See Copyright Notice in lua.h
*/
#define lapi_c
#define LUA_CORE
#include "lprefix.h"
#include <limits.h>
#include <stdarg.h>
#include <string.h>
#include "lua.h"
#include "lapi.h"
#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "lgc.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "ltm.h"
#include "lundump.h"
#include "lvm.h"
const char lua_ident[] =
"$LuaVersion: " LUA_COPYRIGHT " $"
"$LuaAuthors: " LUA_AUTHORS " $";
/*
** Test for a valid index.
** '!ttisnil(o)' implies 'o != &G(L)->nilvalue', so it is not needed.
** However, it covers the most common cases in a faster way.
*/
#define isvalid(L, o) (!ttisnil(o) || o != &G(L)->nilvalue)
/* test for pseudo index */
#define ispseudo(i) ((i) <= LUA_REGISTRYINDEX)
/* test for upvalue */
#define isupvalue(i) ((i) < LUA_REGISTRYINDEX)
static TValue *index2value (lua_State *L, int idx) {
CallInfo *ci = L->ci;
if (idx > 0) {
StkId o = ci->func + idx;
api_check(L, idx <= L->ci->top - (ci->func + 1), "unacceptable index");
if (o >= L->top) return &G(L)->nilvalue;
else return s2v(o);
}
else if (!ispseudo(idx)) { /* negative index */
api_check(L, idx != 0 && -idx <= L->top - (ci->func + 1), "invalid index");
return s2v(L->top + idx);
}
else if (idx == LUA_REGISTRYINDEX)
return &G(L)->l_registry;
else { /* upvalues */
idx = LUA_REGISTRYINDEX - idx;
api_check(L, idx <= MAXUPVAL + 1, "upvalue index too large");
if (ttislcf(s2v(ci->func))) /* light C function? */
return &G(L)->nilvalue; /* it has no upvalues */
else {
CClosure *func = clCvalue(s2v(ci->func));
return (idx <= func->nupvalues) ? &func->upvalue[idx-1] : &G(L)->nilvalue;
}
}
}
static StkId index2stack (lua_State *L, int idx) {
CallInfo *ci = L->ci;
if (idx > 0) {
StkId o = ci->func + idx;
api_check(L, o < L->top, "unacceptable index");
return o;
}
else { /* non-positive index */
api_check(L, idx != 0 && -idx <= L->top - (ci->func + 1), "invalid index");
api_check(L, !ispseudo(idx), "invalid index");
return L->top + idx;
}
}
LUA_API int lua_checkstack (lua_State *L, int n) {
int res;
CallInfo *ci = L->ci;
lua_lock(L);
api_check(L, n >= 0, "negative 'n'");
if (L->stack_last - L->top > n) /* stack large enough? */
res = 1; /* yes; check is OK */
else { /* no; need to grow stack */
int inuse = cast_int(L->top - L->stack) + EXTRA_STACK;
if (inuse > LUAI_MAXSTACK - n) /* can grow without overflow? */
res = 0; /* no */
else /* try to grow stack */
res = luaD_growstack(L, n, 0);
}
if (res && ci->top < L->top + n)
ci->top = L->top + n; /* adjust frame top */
lua_unlock(L);
return res;
}
LUA_API void lua_xmove (lua_State *from, lua_State *to, int n) {
int i;
if (from == to) return;
lua_lock(to);
api_checknelems(from, n);
api_check(from, G(from) == G(to), "moving among independent states");
api_check(from, to->ci->top - to->top >= n, "stack overflow");
from->top -= n;
for (i = 0; i < n; i++) {
setobjs2s(to, to->top, from->top + i);
to->top++; /* stack already checked by previous 'api_check' */
}
lua_unlock(to);
}
LUA_API lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf) {
lua_CFunction old;
lua_lock(L);
old = G(L)->panic;
G(L)->panic = panicf;
lua_unlock(L);
return old;
}
LUA_API lua_Number lua_version (lua_State *L) {
UNUSED(L);
return LUA_VERSION_NUM;
}
/*
** basic stack manipulation
*/
/*
** convert an acceptable stack index into an absolute index
*/
LUA_API int lua_absindex (lua_State *L, int idx) {
return (idx > 0 || ispseudo(idx))
? idx
: cast_int(L->top - L->ci->func) + idx;
}
LUA_API int lua_gettop (lua_State *L) {
return cast_int(L->top - (L->ci->func + 1));
}
LUA_API void lua_settop (lua_State *L, int idx) {
CallInfo *ci = L->ci;
StkId func = ci->func;
ptrdiff_t diff; /* difference for new top */
lua_lock(L);
if (idx >= 0) {
api_check(L, idx <= ci->top - (func + 1), "new top too large");
diff = ((func + 1) + idx) - L->top;
for (; diff > 0; diff--)
setnilvalue(s2v(L->top++)); /* clear new slots */
}
else {
api_check(L, -(idx+1) <= (L->top - (func + 1)), "invalid new top");
diff = idx + 1; /* will "subtract" index (as it is negative) */
}
if (diff < 0 && hastocloseCfunc(ci->nresults))
luaF_close(L, L->top + diff, LUA_OK);
L->top += diff; /* correct top only after closing any upvalue */
lua_unlock(L);
}
/*
** Reverse the stack segment from 'from' to 'to'
** (auxiliary to 'lua_rotate')
** Note that we move(copy) only the value inside the stack.
** (We do not move additional fields that may exist.)
*/
static void reverse (lua_State *L, StkId from, StkId to) {
for (; from < to; from++, to--) {
TValue temp;
setobj(L, &temp, s2v(from));
setobjs2s(L, from, to);
setobj2s(L, to, &temp);
}
}
/*
** Let x = AB, where A is a prefix of length 'n'. Then,
** rotate x n == BA. But BA == (A^r . B^r)^r.
*/
LUA_API void lua_rotate (lua_State *L, int idx, int n) {
StkId p, t, m;
lua_lock(L);
t = L->top - 1; /* end of stack segment being rotated */
p = index2stack(L, idx); /* start of segment */
api_check(L, (n >= 0 ? n : -n) <= (t - p + 1), "invalid 'n'");
m = (n >= 0 ? t - n : p - n - 1); /* end of prefix */
reverse(L, p, m); /* reverse the prefix with length 'n' */
reverse(L, m + 1, t); /* reverse the suffix */
reverse(L, p, t); /* reverse the entire segment */
lua_unlock(L);
}
LUA_API void lua_copy (lua_State *L, int fromidx, int toidx) {
TValue *fr, *to;
lua_lock(L);
fr = index2value(L, fromidx);
to = index2value(L, toidx);
api_check(L, isvalid(L, to), "invalid index");
setobj(L, to, fr);
if (isupvalue(toidx)) /* function upvalue? */
luaC_barrier(L, clCvalue(s2v(L->ci->func)), fr);
/* LUA_REGISTRYINDEX does not need gc barrier
(collector revisits it before finishing collection) */
lua_unlock(L);
}
LUA_API void lua_pushvalue (lua_State *L, int idx) {
lua_lock(L);
setobj2s(L, L->top, index2value(L, idx));
api_incr_top(L);
lua_unlock(L);
}
/*
** access functions (stack -> C)
*/
LUA_API int lua_type (lua_State *L, int idx) {
const TValue *o = index2value(L, idx);
return (isvalid(L, o) ? ttype(o) : LUA_TNONE);
}
LUA_API const char *lua_typename (lua_State *L, int t) {
UNUSED(L);
api_check(L, LUA_TNONE <= t && t < LUA_NUMTYPES, "invalid type");
return ttypename(t);
}
LUA_API int lua_iscfunction (lua_State *L, int idx) {
const TValue *o = index2value(L, idx);
return (ttislcf(o) || (ttisCclosure(o)));
}
LUA_API int lua_isinteger (lua_State *L, int idx) {
const TValue *o = index2value(L, idx);
return ttisinteger(o);
}
LUA_API int lua_isnumber (lua_State *L, int idx) {
lua_Number n;
const TValue *o = index2value(L, idx);
return tonumber(o, &n);
}
LUA_API int lua_isstring (lua_State *L, int idx) {
const TValue *o = index2value(L, idx);
return (ttisstring(o) || cvt2str(o));
}
LUA_API int lua_isuserdata (lua_State *L, int idx) {
const TValue *o = index2value(L, idx);
return (ttisfulluserdata(o) || ttislightuserdata(o));
}
LUA_API int lua_rawequal (lua_State *L, int index1, int index2) {
const TValue *o1 = index2value(L, index1);
const TValue *o2 = index2value(L, index2);
return (isvalid(L, o1) && isvalid(L, o2)) ? luaV_rawequalobj(o1, o2) : 0;
}
LUA_API void lua_arith (lua_State *L, int op) {
lua_lock(L);
if (op != LUA_OPUNM && op != LUA_OPBNOT)
api_checknelems(L, 2); /* all other operations expect two operands */
else { /* for unary operations, add fake 2nd operand */
api_checknelems(L, 1);
setobjs2s(L, L->top, L->top - 1);
api_incr_top(L);
}
/* first operand at top - 2, second at top - 1; result go to top - 2 */
luaO_arith(L, op, s2v(L->top - 2), s2v(L->top - 1), L->top - 2);
L->top--; /* remove second operand */
lua_unlock(L);
}
LUA_API int lua_compare (lua_State *L, int index1, int index2, int op) {
const TValue *o1;
const TValue *o2;
int i = 0;
lua_lock(L); /* may call tag method */
o1 = index2value(L, index1);
o2 = index2value(L, index2);
if (isvalid(L, o1) && isvalid(L, o2)) {
switch (op) {
case LUA_OPEQ: i = luaV_equalobj(L, o1, o2); break;
case LUA_OPLT: i = luaV_lessthan(L, o1, o2); break;
case LUA_OPLE: i = luaV_lessequal(L, o1, o2); break;
default: api_check(L, 0, "invalid option");
}
}
lua_unlock(L);
return i;
}
LUA_API size_t lua_stringtonumber (lua_State *L, const char *s) {
size_t sz = luaO_str2num(s, s2v(L->top));
if (sz != 0)
api_incr_top(L);
return sz;
}
LUA_API lua_Number lua_tonumberx (lua_State *L, int idx, int *pisnum) {
lua_Number n = 0;
const TValue *o = index2value(L, idx);
int isnum = tonumber(o, &n);
if (pisnum)
*pisnum = isnum;
return n;
}
LUA_API lua_Integer lua_tointegerx (lua_State *L, int idx, int *pisnum) {
lua_Integer res = 0;
const TValue *o = index2value(L, idx);
int isnum = tointeger(o, &res);
if (pisnum)
*pisnum = isnum;
return res;
}
LUA_API int lua_toboolean (lua_State *L, int idx) {
const TValue *o = index2value(L, idx);
return !l_isfalse(o);
}
LUA_API const char *lua_tolstring (lua_State *L, int idx, size_t *len) {
TValue *o = index2value(L, idx);
if (!ttisstring(o)) {
if (!cvt2str(o)) { /* not convertible? */
if (len != NULL) *len = 0;
return NULL;
}
lua_lock(L); /* 'luaO_tostring' may create a new string */
luaO_tostring(L, o);
luaC_checkGC(L);
o = index2value(L, idx); /* previous call may reallocate the stack */
lua_unlock(L);
}
if (len != NULL)
*len = vslen(o);
return svalue(o);
}
LUA_API lua_Unsigned lua_rawlen (lua_State *L, int idx) {
const TValue *o = index2value(L, idx);
switch (ttypetag(o)) {
case LUA_VSHRSTR: return tsvalue(o)->shrlen;
case LUA_VLNGSTR: return tsvalue(o)->u.lnglen;
case LUA_VUSERDATA: return uvalue(o)->len;
case LUA_VTABLE: return luaH_getn(hvalue(o));
default: return 0;
}
}
LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx) {
const TValue *o = index2value(L, idx);
if (ttislcf(o)) return fvalue(o);
else if (ttisCclosure(o))
return clCvalue(o)->f;
else return NULL; /* not a C function */
}
static void *touserdata (const TValue *o) {
switch (ttype(o)) {
case LUA_TUSERDATA: return getudatamem(uvalue(o));
case LUA_TLIGHTUSERDATA: return pvalue(o);
default: return NULL;
}
}
LUA_API void *lua_touserdata (lua_State *L, int idx) {
const TValue *o = index2value(L, idx);
return touserdata(o);
}
LUA_API lua_State *lua_tothread (lua_State *L, int idx) {
const TValue *o = index2value(L, idx);
return (!ttisthread(o)) ? NULL : thvalue(o);
}
/*
** Returns a pointer to the internal representation of an object.
** Note that ANSI C does not allow the conversion of a pointer to
** function to a 'void*', so the conversion here goes through
** a 'size_t'. (As the returned pointer is only informative, this
** conversion should not be a problem.)
*/
LUA_API const void *lua_topointer (lua_State *L, int idx) {
const TValue *o = index2value(L, idx);
switch (ttypetag(o)) {
case LUA_VLCF: return cast_voidp(cast_sizet(fvalue(o)));
case LUA_VUSERDATA: case LUA_VLIGHTUSERDATA:
return touserdata(o);
default: {
if (iscollectable(o))
return gcvalue(o);
else
return NULL;
}
}
}
/*
** push functions (C -> stack)
*/
LUA_API void lua_pushnil (lua_State *L) {
lua_lock(L);
setnilvalue(s2v(L->top));
api_incr_top(L);
lua_unlock(L);
}
LUA_API void lua_pushnumber (lua_State *L, lua_Number n) {
lua_lock(L);
setfltvalue(s2v(L->top), n);
api_incr_top(L);
lua_unlock(L);
}
LUA_API void lua_pushinteger (lua_State *L, lua_Integer n) {
lua_lock(L);
setivalue(s2v(L->top), n);
api_incr_top(L);
lua_unlock(L);
}
/*
** Pushes on the stack a string with given length. Avoid using 's' when
** 'len' == 0 (as 's' can be NULL in that case), due to later use of
** 'memcmp' and 'memcpy'.
*/
LUA_API const char *lua_pushlstring (lua_State *L, const char *s, size_t len) {
TString *ts;
lua_lock(L);
ts = (len == 0) ? luaS_new(L, "") : luaS_newlstr(L, s, len);
setsvalue2s(L, L->top, ts);
api_incr_top(L);
luaC_checkGC(L);
lua_unlock(L);
return getstr(ts);
}
LUA_API const char *lua_pushstring (lua_State *L, const char *s) {
lua_lock(L);
if (s == NULL)
setnilvalue(s2v(L->top));
else {
TString *ts;
ts = luaS_new(L, s);
setsvalue2s(L, L->top, ts);
s = getstr(ts); /* internal copy's address */
}
api_incr_top(L);
luaC_checkGC(L);
lua_unlock(L);
return s;
}
LUA_API const char *lua_pushvfstring (lua_State *L, const char *fmt,
va_list argp) {
const char *ret;
lua_lock(L);
ret = luaO_pushvfstring(L, fmt, argp);
luaC_checkGC(L);
lua_unlock(L);
return ret;
}
LUA_API const char *lua_pushfstring (lua_State *L, const char *fmt, ...) {
const char *ret;
va_list argp;
lua_lock(L);
va_start(argp, fmt);
ret = luaO_pushvfstring(L, fmt, argp);
va_end(argp);
luaC_checkGC(L);
lua_unlock(L);
return ret;
}
LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
lua_lock(L);
if (n == 0) {
setfvalue(s2v(L->top), fn);
api_incr_top(L);
}
else {
CClosure *cl;
api_checknelems(L, n);
api_check(L, n <= MAXUPVAL, "upvalue index too large");
cl = luaF_newCclosure(L, n);
cl->f = fn;
L->top -= n;
while (n--) {
setobj2n(L, &cl->upvalue[n], s2v(L->top + n));
/* does not need barrier because closure is white */
}
setclCvalue(L, s2v(L->top), cl);
api_incr_top(L);
luaC_checkGC(L);
}
lua_unlock(L);
}
LUA_API void lua_pushboolean (lua_State *L, int b) {
lua_lock(L);
if (b)
setbtvalue(s2v(L->top));
else
setbfvalue(s2v(L->top));
api_incr_top(L);
lua_unlock(L);
}
LUA_API void lua_pushlightuserdata (lua_State *L, void *p) {
lua_lock(L);
setpvalue(s2v(L->top), p);
api_incr_top(L);
lua_unlock(L);
}
LUA_API int lua_pushthread (lua_State *L) {
lua_lock(L);
setthvalue(L, s2v(L->top), L);
api_incr_top(L);
lua_unlock(L);
return (G(L)->mainthread == L);
}
/*
** get functions (Lua -> stack)
*/
static int auxgetstr (lua_State *L, const TValue *t, const char *k) {
const TValue *slot;
TString *str = luaS_new(L, k);
if (luaV_fastget(L, t, str, slot, luaH_getstr)) {
setobj2s(L, L->top, slot);
api_incr_top(L);
}
else {
setsvalue2s(L, L->top, str);
api_incr_top(L);
luaV_finishget(L, t, s2v(L->top - 1), L->top - 1, slot);
}
lua_unlock(L);
return ttype(s2v(L->top - 1));
}
LUA_API int lua_getglobal (lua_State *L, const char *name) {
Table *reg = hvalue(&G(L)->l_registry);
lua_lock(L);
return auxgetstr(L, luaH_getint(reg, LUA_RIDX_GLOBALS), name);
}
LUA_API int lua_gettable (lua_State *L, int idx) {
const TValue *slot;
TValue *t;
lua_lock(L);
t = index2value(L, idx);
if (luaV_fastget(L, t, s2v(L->top - 1), slot, luaH_get)) {
setobj2s(L, L->top - 1, slot);
}
else
luaV_finishget(L, t, s2v(L->top - 1), L->top - 1, slot);
lua_unlock(L);
return ttype(s2v(L->top - 1));
}
LUA_API int lua_getfield (lua_State *L, int idx, const char *k) {
lua_lock(L);
return auxgetstr(L, index2value(L, idx), k);
}
LUA_API int lua_geti (lua_State *L, int idx, lua_Integer n) {
TValue *t;
const TValue *slot;
lua_lock(L);
t = index2value(L, idx);
if (luaV_fastgeti(L, t, n, slot)) {
setobj2s(L, L->top, slot);
}
else {
TValue aux;
setivalue(&aux, n);
luaV_finishget(L, t, &aux, L->top, slot);
}
api_incr_top(L);
lua_unlock(L);
return ttype(s2v(L->top - 1));
}
static int finishrawget (lua_State *L, const TValue *val) {
if (isempty(val)) /* avoid copying empty items to the stack */
setnilvalue(s2v(L->top));
else
setobj2s(L, L->top, val);
api_incr_top(L);
lua_unlock(L);
return ttype(s2v(L->top - 1));
}
static Table *gettable (lua_State *L, int idx) {
TValue *t = index2value(L, idx);
api_check(L, ttistable(t), "table expected");
return hvalue(t);
}
LUA_API int lua_rawget (lua_State *L, int idx) {
Table *t;
const TValue *val;
lua_lock(L);
api_checknelems(L, 1);
t = gettable(L, idx);
val = luaH_get(t, s2v(L->top - 1));
L->top--; /* remove key */
return finishrawget(L, val);
}
LUA_API int lua_rawgeti (lua_State *L, int idx, lua_Integer n) {
Table *t;
lua_lock(L);
t = gettable(L, idx);
return finishrawget(L, luaH_getint(t, n));
}
LUA_API int lua_rawgetp (lua_State *L, int idx, const void *p) {
Table *t;
TValue k;
lua_lock(L);
t = gettable(L, idx);
setpvalue(&k, cast_voidp(p));
return finishrawget(L, luaH_get(t, &k));
}
LUA_API void lua_createtable (lua_State *L, int narray, int nrec) {
Table *t;
lua_lock(L);
t = luaH_new(L);
sethvalue2s(L, L->top, t);
api_incr_top(L);
if (narray > 0 || nrec > 0)
luaH_resize(L, t, narray, nrec);
luaC_checkGC(L);
lua_unlock(L);
}
LUA_API int lua_getmetatable (lua_State *L, int objindex) {
const TValue *obj;
Table *mt;
int res = 0;
lua_lock(L);
obj = index2value(L, objindex);
switch (ttype(obj)) {
case LUA_TTABLE:
mt = hvalue(obj)->metatable;
break;
case LUA_TUSERDATA:
mt = uvalue(obj)->metatable;
break;
default:
mt = G(L)->mt[ttype(obj)];
break;
}
if (mt != NULL) {
sethvalue2s(L, L->top, mt);
api_incr_top(L);
res = 1;
}
lua_unlock(L);
return res;
}
LUA_API int lua_getiuservalue (lua_State *L, int idx, int n) {
TValue *o;
int t;
lua_lock(L);
o = index2value(L, idx);
api_check(L, ttisfulluserdata(o), "full userdata expected");
if (n <= 0 || n > uvalue(o)->nuvalue) {
setnilvalue(s2v(L->top));
t = LUA_TNONE;
}
else {
setobj2s(L, L->top, &uvalue(o)->uv[n - 1].uv);
t = ttype(s2v(L->top));
}
api_incr_top(L);
lua_unlock(L);
return t;
}
/*
** set functions (stack -> Lua)
*/
/*
** t[k] = value at the top of the stack (where 'k' is a string)
*/
static void auxsetstr (lua_State *L, const TValue *t, const char *k) {
const TValue *slot;
TString *str = luaS_new(L, k);
api_checknelems(L, 1);
if (luaV_fastget(L, t, str, slot, luaH_getstr)) {
luaV_finishfastset(L, t, slot, s2v(L->top - 1));
L->top--; /* pop value */
}
else {
setsvalue2s(L, L->top, str); /* push 'str' (to make it a TValue) */
api_incr_top(L);
luaV_finishset(L, t, s2v(L->top - 1), s2v(L->top - 2), slot);
L->top -= 2; /* pop value and key */
}
lua_unlock(L); /* lock done by caller */
}
LUA_API void lua_setglobal (lua_State *L, const char *name) {
Table *reg = hvalue(&G(L)->l_registry);
lua_lock(L); /* unlock done in 'auxsetstr' */
auxsetstr(L, luaH_getint(reg, LUA_RIDX_GLOBALS), name);
}
LUA_API void lua_settable (lua_State *L, int idx) {
TValue *t;
const TValue *slot;
lua_lock(L);
api_checknelems(L, 2);
t = index2value(L, idx);
if (luaV_fastget(L, t, s2v(L->top - 2), slot, luaH_get)) {
luaV_finishfastset(L, t, slot, s2v(L->top - 1));
}
else
luaV_finishset(L, t, s2v(L->top - 2), s2v(L->top - 1), slot);
L->top -= 2; /* pop index and value */
lua_unlock(L);
}
LUA_API void lua_setfield (lua_State *L, int idx, const char *k) {
lua_lock(L); /* unlock done in 'auxsetstr' */
auxsetstr(L, index2value(L, idx), k);
}
LUA_API void lua_seti (lua_State *L, int idx, lua_Integer n) {
TValue *t;
const TValue *slot;
lua_lock(L);
api_checknelems(L, 1);
t = index2value(L, idx);
if (luaV_fastgeti(L, t, n, slot)) {
luaV_finishfastset(L, t, slot, s2v(L->top - 1));
}
else {
TValue aux;
setivalue(&aux, n);
luaV_finishset(L, t, &aux, s2v(L->top - 1), slot);
}
L->top--; /* pop value */
lua_unlock(L);
}
static void aux_rawset (lua_State *L, int idx, TValue *key, int n) {
Table *t;
TValue *slot;
lua_lock(L);
api_checknelems(L, n);
t = gettable(L, idx);
slot = luaH_set(L, t, key);
setobj2t(L, slot, s2v(L->top - 1));
invalidateTMcache(t);
luaC_barrierback(L, obj2gco(t), s2v(L->top - 1));
L->top -= n;
lua_unlock(L);
}
LUA_API void lua_rawset (lua_State *L, int idx) {
aux_rawset(L, idx, s2v(L->top - 2), 2);
}
LUA_API void lua_rawsetp (lua_State *L, int idx, const void *p) {
TValue k;
setpvalue(&k, cast_voidp(p));
aux_rawset(L, idx, &k, 1);
}
LUA_API void lua_rawseti (lua_State *L, int idx, lua_Integer n) {
Table *t;
lua_lock(L);
api_checknelems(L, 1);
t = gettable(L, idx);
luaH_setint(L, t, n, s2v(L->top - 1));
luaC_barrierback(L, obj2gco(t), s2v(L->top - 1));
L->top--;
lua_unlock(L);
}
LUA_API int lua_setmetatable (lua_State *L, int objindex) {
TValue *obj;
Table *mt;
lua_lock(L);
api_checknelems(L, 1);
obj = index2value(L, objindex);
if (ttisnil(s2v(L->top - 1)))
mt = NULL;
else {
api_check(L, ttistable(s2v(L->top - 1)), "table expected");
mt = hvalue(s2v(L->top - 1));
}
switch (ttype(obj)) {
case LUA_TTABLE: {
hvalue(obj)->metatable = mt;
if (mt) {
luaC_objbarrier(L, gcvalue(obj), mt);
luaC_checkfinalizer(L, gcvalue(obj), mt);
}
break;
}
case LUA_TUSERDATA: {
uvalue(obj)->metatable = mt;
if (mt) {
luaC_objbarrier(L, uvalue(obj), mt);
luaC_checkfinalizer(L, gcvalue(obj), mt);
}
break;
}
default: {
G(L)->mt[ttype(obj)] = mt;
break;
}
}
L->top--;
lua_unlock(L);
return 1;
}
LUA_API int lua_setiuservalue (lua_State *L, int idx, int n) {
TValue *o;
int res;
lua_lock(L);
api_checknelems(L, 1);
o = index2value(L, idx);
api_check(L, ttisfulluserdata(o), "full userdata expected");
if (!(cast_uint(n) - 1u < cast_uint(uvalue(o)->nuvalue)))
res = 0; /* 'n' not in [1, uvalue(o)->nuvalue] */
else {
setobj(L, &uvalue(o)->uv[n - 1].uv, s2v(L->top - 1));
luaC_barrierback(L, gcvalue(o), s2v(L->top - 1));
res = 1;
}
L->top--;
lua_unlock(L);
return res;
}
/*
** 'load' and 'call' functions (run Lua code)
*/
#define checkresults(L,na,nr) \
api_check(L, (nr) == LUA_MULTRET || (L->ci->top - L->top >= (nr) - (na)), \
"results from function overflow current stack size")
LUA_API void lua_callk (lua_State *L, int nargs, int nresults,
lua_KContext ctx, lua_KFunction k) {
StkId func;
lua_lock(L);
api_check(L, k == NULL || !isLua(L->ci),
"cannot use continuations inside hooks");
api_checknelems(L, nargs+1);
api_check(L, L->status == LUA_OK, "cannot do calls on non-normal thread");
checkresults(L, nargs, nresults);
func = L->top - (nargs+1);
if (k != NULL && yieldable(L)) { /* need to prepare continuation? */
L->ci->u.c.k = k; /* save continuation */
L->ci->u.c.ctx = ctx; /* save context */
luaD_call(L, func, nresults); /* do the call */
}
else /* no continuation or no yieldable */
luaD_callnoyield(L, func, nresults); /* just do the call */
adjustresults(L, nresults);
lua_unlock(L);
}
/*
** Execute a protected call.
*/
struct CallS { /* data to 'f_call' */
StkId func;
int nresults;
};
static void f_call (lua_State *L, void *ud) {
struct CallS *c = cast(struct CallS *, ud);
luaD_callnoyield(L, c->func, c->nresults);
}
LUA_API int lua_pcallk (lua_State *L, int nargs, int nresults, int errfunc,
lua_KContext ctx, lua_KFunction k) {
struct CallS c;
int status;
ptrdiff_t func;
lua_lock(L);
api_check(L, k == NULL || !isLua(L->ci),
"cannot use continuations inside hooks");
api_checknelems(L, nargs+1);
api_check(L, L->status == LUA_OK, "cannot do calls on non-normal thread");
checkresults(L, nargs, nresults);
if (errfunc == 0)
func = 0;
else {
StkId o = index2stack(L, errfunc);
api_check(L, ttisfunction(s2v(o)), "error handler must be a function");
func = savestack(L, o);
}
c.func = L->top - (nargs+1); /* function to be called */
if (k == NULL || !yieldable(L)) { /* no continuation or no yieldable? */
c.nresults = nresults; /* do a 'conventional' protected call */
status = luaD_pcall(L, f_call, &c, savestack(L, c.func), func);
}
else { /* prepare continuation (call is already protected by 'resume') */
CallInfo *ci = L->ci;
ci->u.c.k = k; /* save continuation */
ci->u.c.ctx = ctx; /* save context */
/* save information for error recovery */
ci->u2.funcidx = cast_int(savestack(L, c.func));
ci->u.c.old_errfunc = L->errfunc;
L->errfunc = func;
setoah(ci->callstatus, L->allowhook); /* save value of 'allowhook' */
ci->callstatus |= CIST_YPCALL; /* function can do error recovery */
luaD_call(L, c.func, nresults); /* do the call */
ci->callstatus &= ~CIST_YPCALL;
L->errfunc = ci->u.c.old_errfunc;
status = LUA_OK; /* if it is here, there were no errors */
}
adjustresults(L, nresults);
lua_unlock(L);
return status;
}
LUA_API int lua_load (lua_State *L, lua_Reader reader, void *data,
const char *chunkname, const char *mode) {
ZIO z;
int status;
lua_lock(L);
if (!chunkname) chunkname = "?";
luaZ_init(L, &z, reader, data);
status = luaD_protectedparser(L, &z, chunkname, mode);
if (status == LUA_OK) { /* no errors? */
LClosure *f = clLvalue(s2v(L->top - 1)); /* get newly created function */
if (f->nupvalues >= 1) { /* does it have an upvalue? */
/* get global table from registry */
Table *reg = hvalue(&G(L)->l_registry);
const TValue *gt = luaH_getint(reg, LUA_RIDX_GLOBALS);
/* set global table as 1st upvalue of 'f' (may be LUA_ENV) */
setobj(L, f->upvals[0]->v, gt);
luaC_barrier(L, f->upvals[0], gt);
}
}
lua_unlock(L);
return status;
}
LUA_API int lua_dump (lua_State *L, lua_Writer writer, void *data, int strip) {
int status;
TValue *o;
lua_lock(L);
api_checknelems(L, 1);
o = s2v(L->top - 1);
if (isLfunction(o))
status = luaU_dump(L, getproto(o), writer, data, strip);
else
status = 1;
lua_unlock(L);
return status;
}
LUA_API int lua_status (lua_State *L) {
return L->status;
}
/*
** Garbage-collection function
*/
LUA_API int lua_gc (lua_State *L, int what, ...) {
va_list argp;
int res = 0;
global_State *g = G(L);
lua_lock(L);
va_start(argp, what);
switch (what) {
case LUA_GCSTOP: {
g->gcrunning = 0;
break;
}
case LUA_GCRESTART: {
luaE_setdebt(g, 0);
g->gcrunning = 1;
break;
}
case LUA_GCCOLLECT: {
luaC_fullgc(L, 0);
break;
}
case LUA_GCCOUNT: {
/* GC values are expressed in Kbytes: #bytes/2^10 */
res = cast_int(gettotalbytes(g) >> 10);
break;
}
case LUA_GCCOUNTB: {
res = cast_int(gettotalbytes(g) & 0x3ff);
break;
}
case LUA_GCSTEP: {
int data = va_arg(argp, int);
l_mem debt = 1; /* =1 to signal that it did an actual step */
lu_byte oldrunning = g->gcrunning;
g->gcrunning = 1; /* allow GC to run */
if (data == 0) {
luaE_setdebt(g, 0); /* do a basic step */
luaC_step(L);
}
else { /* add 'data' to total debt */
debt = cast(l_mem, data) * 1024 + g->GCdebt;
luaE_setdebt(g, debt);
luaC_checkGC(L);
}
g->gcrunning = oldrunning; /* restore previous state */
if (debt > 0 && g->gcstate == GCSpause) /* end of cycle? */
res = 1; /* signal it */
break;
}
case LUA_GCSETPAUSE: {
int data = va_arg(argp, int);
res = getgcparam(g->gcpause);
setgcparam(g->gcpause, data);
break;
}
case LUA_GCSETSTEPMUL: {
int data = va_arg(argp, int);
res = getgcparam(g->gcstepmul);
setgcparam(g->gcstepmul, data);
break;
}
case LUA_GCISRUNNING: {
res = g->gcrunning;
break;
}
case LUA_GCGEN: {
int minormul = va_arg(argp, int);
int majormul = va_arg(argp, int);
res = isdecGCmodegen(g) ? LUA_GCGEN : LUA_GCINC;
if (minormul != 0)
g->genminormul = minormul;
if (majormul != 0)
setgcparam(g->genmajormul, majormul);
luaC_changemode(L, KGC_GEN);
break;
}
case LUA_GCINC: {
int pause = va_arg(argp, int);
int stepmul = va_arg(argp, int);
int stepsize = va_arg(argp, int);
res = isdecGCmodegen(g) ? LUA_GCGEN : LUA_GCINC;
if (pause != 0)
setgcparam(g->gcpause, pause);
if (stepmul != 0)
setgcparam(g->gcstepmul, stepmul);
if (stepsize != 0)
g->gcstepsize = stepsize;
luaC_changemode(L, KGC_INC);
break;
}
default: res = -1; /* invalid option */
}
va_end(argp);
lua_unlock(L);
return res;
}
/*
** miscellaneous functions
*/
LUA_API int lua_error (lua_State *L) {
lua_lock(L);
api_checknelems(L, 1);
luaG_errormsg(L);
/* code unreachable; will unlock when control actually leaves the kernel */
return 0; /* to avoid warnings */
}
LUA_API int lua_next (lua_State *L, int idx) {
Table *t;
int more;
lua_lock(L);
api_checknelems(L, 1);
t = gettable(L, idx);
more = luaH_next(L, t, L->top - 1);
if (more) {
api_incr_top(L);
}
else /* no more elements */
L->top -= 1; /* remove key */
lua_unlock(L);
return more;
}
LUA_API void lua_toclose (lua_State *L, int idx) {
int nresults;
StkId o;
lua_lock(L);
o = index2stack(L, idx);
nresults = L->ci->nresults;
api_check(L, L->openupval == NULL || uplevel(L->openupval) <= o,
"marked index below or equal new one");
luaF_newtbcupval(L, o); /* create new to-be-closed upvalue */
if (!hastocloseCfunc(nresults)) /* function not marked yet? */
L->ci->nresults = codeNresults(nresults); /* mark it */
lua_assert(hastocloseCfunc(L->ci->nresults));
lua_unlock(L);
}
LUA_API void lua_concat (lua_State *L, int n) {
lua_lock(L);
api_checknelems(L, n);
if (n >= 2) {
luaV_concat(L, n);
}
else if (n == 0) { /* push empty string */
setsvalue2s(L, L->top, luaS_newlstr(L, "", 0));
api_incr_top(L);
}
/* else n == 1; nothing to do */
luaC_checkGC(L);
lua_unlock(L);
}
LUA_API void lua_len (lua_State *L, int idx) {
TValue *t;
lua_lock(L);
t = index2value(L, idx);
luaV_objlen(L, L->top, t);
api_incr_top(L);
lua_unlock(L);
}
LUA_API lua_Alloc lua_getallocf (lua_State *L, void **ud) {
lua_Alloc f;
lua_lock(L);
if (ud) *ud = G(L)->ud;
f = G(L)->frealloc;
lua_unlock(L);
return f;
}
LUA_API void lua_setallocf (lua_State *L, lua_Alloc f, void *ud) {
lua_lock(L);
G(L)->ud = ud;
G(L)->frealloc = f;
lua_unlock(L);
}
void lua_setwarnf (lua_State *L, lua_WarnFunction f, void *ud) {
lua_lock(L);
G(L)->ud_warn = ud;
G(L)->warnf = f;
lua_unlock(L);
}
void lua_warning (lua_State *L, const char *msg, int tocont) {
lua_lock(L);
luaE_warning(L, msg, tocont);
lua_unlock(L);
}
LUA_API void *lua_newuserdatauv (lua_State *L, size_t size, int nuvalue) {
Udata *u;
lua_lock(L);
api_check(L, 0 <= nuvalue && nuvalue < USHRT_MAX, "invalid value");
u = luaS_newudata(L, size, nuvalue);
setuvalue(L, s2v(L->top), u);
api_incr_top(L);
luaC_checkGC(L);
lua_unlock(L);
return getudatamem(u);
}
static const char *aux_upvalue (TValue *fi, int n, TValue **val,
GCObject **owner) {
switch (ttypetag(fi)) {
case LUA_VCCL: { /* C closure */
CClosure *f = clCvalue(fi);
if (!(cast_uint(n) - 1u < cast_uint(f->nupvalues)))
return NULL; /* 'n' not in [1, f->nupvalues] */
*val = &f->upvalue[n-1];
if (owner) *owner = obj2gco(f);
return "";
}
case LUA_VLCL: { /* Lua closure */
LClosure *f = clLvalue(fi);
TString *name;
Proto *p = f->p;
if (!(cast_uint(n) - 1u < cast_uint(p->sizeupvalues)))
return NULL; /* 'n' not in [1, p->sizeupvalues] */
*val = f->upvals[n-1]->v;
if (owner) *owner = obj2gco(f->upvals[n - 1]);
name = p->upvalues[n-1].name;
return (name == NULL) ? "(no name)" : getstr(name);
}
default: return NULL; /* not a closure */
}
}
LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) {
const char *name;
TValue *val = NULL; /* to avoid warnings */
lua_lock(L);
name = aux_upvalue(index2value(L, funcindex), n, &val, NULL);
if (name) {
setobj2s(L, L->top, val);
api_incr_top(L);
}
lua_unlock(L);
return name;
}
LUA_API const char *lua_setupvalue (lua_State *L, int funcindex, int n) {
const char *name;
TValue *val = NULL; /* to avoid warnings */
GCObject *owner = NULL; /* to avoid warnings */
TValue *fi;
lua_lock(L);
fi = index2value(L, funcindex);
api_checknelems(L, 1);
name = aux_upvalue(fi, n, &val, &owner);
if (name) {
L->top--;
setobj(L, val, s2v(L->top));
luaC_barrier(L, owner, val);
}
lua_unlock(L);
return name;
}
static UpVal **getupvalref (lua_State *L, int fidx, int n, LClosure **pf) {
LClosure *f;
TValue *fi = index2value(L, fidx);
api_check(L, ttisLclosure(fi), "Lua function expected");
f = clLvalue(fi);
api_check(L, (1 <= n && n <= f->p->sizeupvalues), "invalid upvalue index");
if (pf) *pf = f;
return &f->upvals[n - 1]; /* get its upvalue pointer */
}
LUA_API void *lua_upvalueid (lua_State *L, int fidx, int n) {
TValue *fi = index2value(L, fidx);
switch (ttypetag(fi)) {
case LUA_VLCL: { /* lua closure */
return *getupvalref(L, fidx, n, NULL);
}
case LUA_VCCL: { /* C closure */
CClosure *f = clCvalue(fi);
api_check(L, 1 <= n && n <= f->nupvalues, "invalid upvalue index");
return &f->upvalue[n - 1];
}
default: {
api_check(L, 0, "closure expected");
return NULL;
}
}
}
LUA_API void lua_upvaluejoin (lua_State *L, int fidx1, int n1,
int fidx2, int n2) {
LClosure *f1;
UpVal **up1 = getupvalref(L, fidx1, n1, &f1);
UpVal **up2 = getupvalref(L, fidx2, n2, NULL);
*up1 = *up2;
luaC_objbarrier(L, f1, *up1);
}
LAUXLIB¶
/*
** $Id: lauxlib.h $
** Auxiliary functions for building Lua libraries
** See Copyright Notice in lua.h
*/
#ifndef lauxlib_h
#define lauxlib_h
#include <stddef.h>
#include <stdio.h>
#include "lua.h"
#include "_native_lua_config.h" /* native Lua */
/* global table */
#define LUA_GNAME "_G"
typedef struct luaL_Buffer luaL_Buffer;
/* extra error code for 'luaL_loadfilex' */
#define LUA_ERRFILE (LUA_ERRERR+1)
/* key, in the registry, for table of loaded modules */
#define LUA_LOADED_TABLE "_LOADED"
/* key, in the registry, for table of preloaded loaders */
#define LUA_PRELOAD_TABLE "_PRELOAD"
typedef struct luaL_Reg {
const char *name;
lua_CFunction func;
} luaL_Reg;
#define LUAL_NUMSIZES (sizeof(lua_Integer)*16 + sizeof(lua_Number))
LUALIB_API void (luaL_checkversion_) (lua_State *L, lua_Number ver, size_t sz);
#define luaL_checkversion(L) \
luaL_checkversion_(L, LUA_VERSION_NUM, LUAL_NUMSIZES)
LUALIB_API int (luaL_getmetafield) (lua_State *L, int obj, const char *e);
LUALIB_API int (luaL_callmeta) (lua_State *L, int obj, const char *e);
LUALIB_API const char *(luaL_tolstring) (lua_State *L, int idx, size_t *len);
LUALIB_API int (luaL_argerror) (lua_State *L, int arg, const char *extramsg);
LUALIB_API int (luaL_typeerror) (lua_State *L, int arg, const char *tname);
LUALIB_API const char *(luaL_checklstring) (lua_State *L, int arg,
size_t *l);
LUALIB_API const char *(luaL_optlstring) (lua_State *L, int arg,
const char *def, size_t *l);
LUALIB_API lua_Number (luaL_checknumber) (lua_State *L, int arg);
LUALIB_API lua_Number (luaL_optnumber) (lua_State *L, int arg, lua_Number def);
LUALIB_API lua_Integer (luaL_checkinteger) (lua_State *L, int arg);
LUALIB_API lua_Integer (luaL_optinteger) (lua_State *L, int arg,
lua_Integer def);
LUALIB_API void (luaL_checkstack) (lua_State *L, int sz, const char *msg);
LUALIB_API void (luaL_checktype) (lua_State *L, int arg, int t);
LUALIB_API void (luaL_checkany) (lua_State *L, int arg);
LUALIB_API int (luaL_newmetatable) (lua_State *L, const char *tname);
LUALIB_API void (luaL_setmetatable) (lua_State *L, const char *tname);
LUALIB_API void *(luaL_testudata) (lua_State *L, int ud, const char *tname);
LUALIB_API void *(luaL_checkudata) (lua_State *L, int ud, const char *tname);
LUALIB_API void (luaL_where) (lua_State *L, int lvl);
LUALIB_API int (luaL_error) (lua_State *L, const char *fmt, ...);
LUALIB_API int (luaL_checkoption) (lua_State *L, int arg, const char *def,
const char *const lst[]);
LUALIB_API int (luaL_fileresult) (lua_State *L, int stat, const char *fname);
LUALIB_API int (luaL_execresult) (lua_State *L, int stat);
/* predefined references */
#define LUA_NOREF (-2)
#define LUA_REFNIL (-1)
LUALIB_API int (luaL_ref) (lua_State *L, int t);
LUALIB_API void (luaL_unref) (lua_State *L, int t, int ref);
LUALIB_API int (luaL_loadfilex) (lua_State *L, const char *filename,
const char *mode);
#define luaL_loadfile(L,f) luaL_loadfilex(L,f,NULL)
LUALIB_API int (luaL_loadbufferx) (lua_State *L, const char *buff, size_t sz,
const char *name, const char *mode);
LUALIB_API int (luaL_loadstring) (lua_State *L, const char *s);
LUALIB_API lua_State *(luaL_newstate) (void);
LUALIB_API lua_Integer (luaL_len) (lua_State *L, int idx);
LUALIB_API void luaL_addgsub (luaL_Buffer *b, const char *s,
const char *p, const char *r);
LUALIB_API const char *(luaL_gsub) (lua_State *L, const char *s,
const char *p, const char *r);
LUALIB_API void (luaL_setfuncs) (lua_State *L, const luaL_Reg *l, int nup);
LUALIB_API int (luaL_getsubtable) (lua_State *L, int idx, const char *fname);
LUALIB_API void (luaL_traceback) (lua_State *L, lua_State *L1,
const char *msg, int level);
LUALIB_API void (luaL_requiref) (lua_State *L, const char *modname,
lua_CFunction openf, int glb);
/*
** ===============================================================
** some useful macros
** ===============================================================
*/
#define luaL_newlibtable(L,l) \
lua_createtable(L, 0, sizeof(l)/sizeof((l)[0]) - 1)
#define luaL_newlib(L,l) \
(luaL_checkversion(L), luaL_newlibtable(L,l), luaL_setfuncs(L,l,0))
#define luaL_argcheck(L, cond,arg,extramsg) \
((void)((cond) || luaL_argerror(L, (arg), (extramsg))))
#define luaL_argexpected(L,cond,arg,tname) \
((void)((cond) || luaL_typeerror(L, (arg), (tname))))
#define luaL_checkstring(L,n) (luaL_checklstring(L, (n), NULL))
#define luaL_optstring(L,n,d) (luaL_optlstring(L, (n), (d), NULL))
#define luaL_typename(L,i) lua_typename(L, lua_type(L,(i)))
#define luaL_dofile(L, fn) \
(luaL_loadfile(L, fn) || lua_pcall(L, 0, LUA_MULTRET, 0))
#define luaL_dostring(L, s) \
(luaL_loadstring(L, s) || lua_pcall(L, 0, LUA_MULTRET, 0))
#define luaL_getmetatable(L,n) (lua_getfield(L, LUA_REGISTRYINDEX, (n)))
#define luaL_opt(L,f,n,d) (lua_isnoneornil(L,(n)) ? (d) : f(L,(n)))
#define luaL_loadbuffer(L,s,sz,n) luaL_loadbufferx(L,s,sz,n,NULL)
/* push the value used to represent failure/error */
#define luaL_pushfail(L) lua_pushnil(L)
/*
** {======================================================
** Generic Buffer manipulation
** =======================================================
*/
struct luaL_Buffer {
char *b; /* buffer address */
size_t size; /* buffer size */
size_t n; /* number of characters in buffer */
lua_State *L;
union {
LUAI_MAXALIGN; /* ensure maximum alignment for buffer */
char b[LUAL_BUFFERSIZE]; /* initial buffer */
} init;
};
#define luaL_bufflen(bf) ((bf)->n)
#define luaL_buffaddr(bf) ((bf)->b)
#define luaL_addchar(B,c) \
((void)((B)->n < (B)->size || luaL_prepbuffsize((B), 1)), \
((B)->b[(B)->n++] = (c)))
#define luaL_addsize(B,s) ((B)->n += (s))
#define luaL_buffsub(B,s) ((B)->n -= (s))
LUALIB_API void (luaL_buffinit) (lua_State *L, luaL_Buffer *B);
LUALIB_API char *(luaL_prepbuffsize) (luaL_Buffer *B, size_t sz);
LUALIB_API void (luaL_addlstring) (luaL_Buffer *B, const char *s, size_t l);
LUALIB_API void (luaL_addstring) (luaL_Buffer *B, const char *s);
LUALIB_API void (luaL_addvalue) (luaL_Buffer *B);
LUALIB_API void (luaL_pushresult) (luaL_Buffer *B);
LUALIB_API void (luaL_pushresultsize) (luaL_Buffer *B, size_t sz);
LUALIB_API char *(luaL_buffinitsize) (lua_State *L, luaL_Buffer *B, size_t sz);
#define luaL_prepbuffer(B) luaL_prepbuffsize(B, LUAL_BUFFERSIZE)
/* }====================================================== */
/*
** {======================================================
** File handles for IO library
** =======================================================
*/
/*
** A file handle is a userdata with metatable 'LUA_FILEHANDLE' and
** initial structure 'luaL_Stream' (it may contain other fields
** after that initial structure).
*/
#define LUA_FILEHANDLE "FILE*"
typedef struct luaL_Stream {
FILE *f; /* stream (NULL for incompletely created streams) */
lua_CFunction closef; /* to close stream (NULL for closed streams) */
} luaL_Stream;
/* }====================================================== */
/*
** {==================================================================
** "Abstraction Layer" for basic report of messages and errors
** ===================================================================
*/
/* print a string */
#if !defined(lua_writestring)
#define lua_writestring(s,l) fwrite((s), sizeof(char), (l), stdout)
#endif
/* print a newline and flush the output */
#if !defined(lua_writeline)
#define lua_writeline() (lua_writestring("\n", 1), fflush(stdout))
#endif
/* print an error message */
#if !defined(lua_writestringerror)
#define lua_writestringerror(s,p) \
(fprintf(stderr, (s), (p)), fflush(stderr))
#endif
/* }================================================================== */
/*
** {============================================================
** Compatibility with deprecated conversions
** =============================================================
*/
#if defined(LUA_COMPAT_APIINTCASTS)
#define luaL_checkunsigned(L,a) ((lua_Unsigned)luaL_checkinteger(L,a))
#define luaL_optunsigned(L,a,d) \
((lua_Unsigned)luaL_optinteger(L,a,(lua_Integer)(d)))
#define luaL_checkint(L,n) ((int)luaL_checkinteger(L, (n)))
#define luaL_optint(L,n,d) ((int)luaL_optinteger(L, (n), (d)))
#define luaL_checklong(L,n) ((long)luaL_checkinteger(L, (n)))
#define luaL_optlong(L,n,d) ((long)luaL_optinteger(L, (n), (d)))
#endif
/* }============================================================ */
#endif
/*
** $Id: lauxlib.c $
** Auxiliary functions for building Lua libraries
** See Copyright Notice in lua.h
*/
#define lauxlib_c
#define LUA_LIB
#include "lprefix.h"
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
** This file uses only the official API of Lua.
** Any function declared here could be written as an application function.
*/
#include "lua.h"
#include "lauxlib.h"
#if !defined(MAX_SIZET)
/* maximum value for size_t */
#define MAX_SIZET ((size_t)(~(size_t)0))
#endif
/*
** {======================================================
** Traceback
** =======================================================
*/
#define LEVELS1 10 /* size of the first part of the stack */
#define LEVELS2 11 /* size of the second part of the stack */
/*
** Search for 'objidx' in table at index -1. ('objidx' must be an
** absolute index.) Return 1 + string at top if it found a good name.
*/
static int findfield (lua_State *L, int objidx, int level) {
if (level == 0 || !lua_istable(L, -1))
return 0; /* not found */
lua_pushnil(L); /* start 'next' loop */
while (lua_next(L, -2)) { /* for each pair in table */
if (lua_type(L, -2) == LUA_TSTRING) { /* ignore non-string keys */
if (lua_rawequal(L, objidx, -1)) { /* found object? */
lua_pop(L, 1); /* remove value (but keep name) */
return 1;
}
else if (findfield(L, objidx, level - 1)) { /* try recursively */
/* stack: lib_name, lib_table, field_name (top) */
lua_pushliteral(L, "."); /* place '.' between the two names */
lua_replace(L, -3); /* (in the slot occupied by table) */
lua_concat(L, 3); /* lib_name.field_name */
return 1;
}
}
lua_pop(L, 1); /* remove value */
}
return 0; /* not found */
}
/*
** Search for a name for a function in all loaded modules
*/
static int pushglobalfuncname (lua_State *L, lua_Debug *ar) {
int top = lua_gettop(L);
lua_getinfo(L, "f", ar); /* push function */
lua_getfield(L, LUA_REGISTRYINDEX, LUA_LOADED_TABLE);
if (findfield(L, top + 1, 2)) {
const char *name = lua_tostring(L, -1);
if (strncmp(name, LUA_GNAME ".", 3) == 0) { /* name start with '_G.'? */
lua_pushstring(L, name + 3); /* push name without prefix */
lua_remove(L, -2); /* remove original name */
}
lua_copy(L, -1, top + 1); /* copy name to proper place */
lua_settop(L, top + 1); /* remove table "loaded" and name copy */
return 1;
}
else {
lua_settop(L, top); /* remove function and global table */
return 0;
}
}
static void pushfuncname (lua_State *L, lua_Debug *ar) {
if (pushglobalfuncname(L, ar)) { /* try first a global name */
lua_pushfstring(L, "function '%s'", lua_tostring(L, -1));
lua_remove(L, -2); /* remove name */
}
else if (*ar->namewhat != '\0') /* is there a name from code? */
lua_pushfstring(L, "%s '%s'", ar->namewhat, ar->name); /* use it */
else if (*ar->what == 'm') /* main? */
lua_pushliteral(L, "main chunk");
else if (*ar->what != 'C') /* for Lua functions, use <file:line> */
lua_pushfstring(L, "function <%s:%d>", ar->short_src, ar->linedefined);
else /* nothing left... */
lua_pushliteral(L, "?");
}
static int lastlevel (lua_State *L) {
lua_Debug ar;
int li = 1, le = 1;
/* find an upper bound */
while (lua_getstack(L, le, &ar)) { li = le; le *= 2; }
/* do a binary search */
while (li < le) {
int m = (li + le)/2;
if (lua_getstack(L, m, &ar)) li = m + 1;
else le = m;
}
return le - 1;
}
LUALIB_API void luaL_traceback (lua_State *L, lua_State *L1,
const char *msg, int level) {
luaL_Buffer b;
lua_Debug ar;
int last = lastlevel(L1);
int limit2show = (last - level > LEVELS1 + LEVELS2) ? LEVELS1 : -1;
luaL_buffinit(L, &b);
if (msg) {
luaL_addstring(&b, msg);
luaL_addchar(&b, '\n');
}
luaL_addstring(&b, "stack traceback:");
while (lua_getstack(L1, level++, &ar)) {
if (limit2show-- == 0) { /* too many levels? */
int n = last - level - LEVELS2 + 1; /* number of levels to skip */
lua_pushfstring(L, "\n\t...\t(skipping %d levels)", n);
luaL_addvalue(&b); /* add warning about skip */
level += n; /* and skip to last levels */
}
else {
lua_getinfo(L1, "Slnt", &ar);
if (ar.currentline <= 0)
lua_pushfstring(L, "\n\t%s: in ", ar.short_src);
else
lua_pushfstring(L, "\n\t%s:%d: in ", ar.short_src, ar.currentline);
luaL_addvalue(&b);
pushfuncname(L, &ar);
luaL_addvalue(&b);
if (ar.istailcall)
luaL_addstring(&b, "\n\t(...tail calls...)");
}
}
luaL_pushresult(&b);
}
/* }====================================================== */
/*
** {======================================================
** Error-report functions
** =======================================================
*/
LUALIB_API int luaL_argerror (lua_State *L, int arg, const char *extramsg) {
lua_Debug ar;
if (!lua_getstack(L, 0, &ar)) /* no stack frame? */
return luaL_error(L, "bad argument #%d (%s)", arg, extramsg);
lua_getinfo(L, "n", &ar);
if (strcmp(ar.namewhat, "method") == 0) {
arg--; /* do not count 'self' */
if (arg == 0) /* error is in the self argument itself? */
return luaL_error(L, "calling '%s' on bad self (%s)",
ar.name, extramsg);
}
if (ar.name == NULL)
ar.name = (pushglobalfuncname(L, &ar)) ? lua_tostring(L, -1) : "?";
return luaL_error(L, "bad argument #%d to '%s' (%s)",
arg, ar.name, extramsg);
}
int luaL_typeerror (lua_State *L, int arg, const char *tname) {
const char *msg;
const char *typearg; /* name for the type of the actual argument */
if (luaL_getmetafield(L, arg, "__name") == LUA_TSTRING)
typearg = lua_tostring(L, -1); /* use the given type name */
else if (lua_type(L, arg) == LUA_TLIGHTUSERDATA)
typearg = "light userdata"; /* special name for messages */
else
typearg = luaL_typename(L, arg); /* standard name */
msg = lua_pushfstring(L, "%s expected, got %s", tname, typearg);
return luaL_argerror(L, arg, msg);
}
static void tag_error (lua_State *L, int arg, int tag) {
luaL_typeerror(L, arg, lua_typename(L, tag));
}
/*
** The use of 'lua_pushfstring' ensures this function does not
** need reserved stack space when called.
*/
LUALIB_API void luaL_where (lua_State *L, int level) {
lua_Debug ar;
if (lua_getstack(L, level, &ar)) { /* check function at level */
lua_getinfo(L, "Sl", &ar); /* get info about it */
if (ar.currentline > 0) { /* is there info? */
lua_pushfstring(L, "%s:%d: ", ar.short_src, ar.currentline);
return;
}
}
lua_pushfstring(L, ""); /* else, no information available... */
}
/*
** Again, the use of 'lua_pushvfstring' ensures this function does
** not need reserved stack space when called. (At worst, it generates
** an error with "stack overflow" instead of the given message.)
*/
LUALIB_API int luaL_error (lua_State *L, const char *fmt, ...) {
va_list argp;
va_start(argp, fmt);
luaL_where(L, 1);
lua_pushvfstring(L, fmt, argp);
va_end(argp);
lua_concat(L, 2);
return lua_error(L);
}
LUALIB_API int luaL_fileresult (lua_State *L, int stat, const char *fname) {
int en = errno; /* calls to Lua API may change this value */
if (stat) {
lua_pushboolean(L, 1);
return 1;
}
else {
luaL_pushfail(L);
if (fname)
lua_pushfstring(L, "%s: %s", fname, strerror(en));
else
lua_pushstring(L, strerror(en));
lua_pushinteger(L, en);
return 3;
}
}
#if !defined(l_inspectstat) /* { */
#if defined(LUA_USE_POSIX)
#include <sys/wait.h>
/*
** use appropriate macros to interpret 'pclose' return status
*/
#define l_inspectstat(stat,what) \
if (WIFEXITED(stat)) { stat = WEXITSTATUS(stat); } \
else if (WIFSIGNALED(stat)) { stat = WTERMSIG(stat); what = "signal"; }
#else
#define l_inspectstat(stat,what) /* no op */
#endif
#endif /* } */
LUALIB_API int luaL_execresult (lua_State *L, int stat) {
const char *what = "exit"; /* type of termination */
if (stat != 0 && errno != 0) /* error with an 'errno'? */
return luaL_fileresult(L, 0, NULL);
else {
l_inspectstat(stat, what); /* interpret result */
if (*what == 'e' && stat == 0) /* successful termination? */
lua_pushboolean(L, 1);
else
luaL_pushfail(L);
lua_pushstring(L, what);
lua_pushinteger(L, stat);
return 3; /* return true/fail,what,code */
}
}
/* }====================================================== */
/*
** {======================================================
** Userdata's metatable manipulation
** =======================================================
*/
LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) {
if (luaL_getmetatable(L, tname) != LUA_TNIL) /* name already in use? */
return 0; /* leave previous value on top, but return 0 */
lua_pop(L, 1);
lua_createtable(L, 0, 2); /* create metatable */
lua_pushstring(L, tname);
lua_setfield(L, -2, "__name"); /* metatable.__name = tname */
lua_pushvalue(L, -1);
lua_setfield(L, LUA_REGISTRYINDEX, tname); /* registry.name = metatable */
return 1;
}
LUALIB_API void luaL_setmetatable (lua_State *L, const char *tname) {
luaL_getmetatable(L, tname);
lua_setmetatable(L, -2);
}
LUALIB_API void *luaL_testudata (lua_State *L, int ud, const char *tname) {
void *p = lua_touserdata(L, ud);
if (p != NULL) { /* value is a userdata? */
if (lua_getmetatable(L, ud)) { /* does it have a metatable? */
luaL_getmetatable(L, tname); /* get correct metatable */
if (!lua_rawequal(L, -1, -2)) /* not the same? */
p = NULL; /* value is a userdata with wrong metatable */
lua_pop(L, 2); /* remove both metatables */
return p;
}
}
return NULL; /* value is not a userdata with a metatable */
}
LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {
void *p = luaL_testudata(L, ud, tname);
luaL_argexpected(L, p != NULL, ud, tname);
return p;
}
/* }====================================================== */
/*
** {======================================================
** Argument check functions
** =======================================================
*/
LUALIB_API int luaL_checkoption (lua_State *L, int arg, const char *def,
const char *const lst[]) {
const char *name = (def) ? luaL_optstring(L, arg, def) :
luaL_checkstring(L, arg);
int i;
for (i=0; lst[i]; i++)
if (strcmp(lst[i], name) == 0)
return i;
return luaL_argerror(L, arg,
lua_pushfstring(L, "invalid option '%s'", name));
}
/*
** Ensures the stack has at least 'space' extra slots, raising an error
** if it cannot fulfill the request. (The error handling needs a few
** extra slots to format the error message. In case of an error without
** this extra space, Lua will generate the same 'stack overflow' error,
** but without 'msg'.)
*/
LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *msg) {
if (!lua_checkstack(L, space)) {
if (msg)
luaL_error(L, "stack overflow (%s)", msg);
else
luaL_error(L, "stack overflow");
}
}
LUALIB_API void luaL_checktype (lua_State *L, int arg, int t) {
if (lua_type(L, arg) != t)
tag_error(L, arg, t);
}
LUALIB_API void luaL_checkany (lua_State *L, int arg) {
if (lua_type(L, arg) == LUA_TNONE)
luaL_argerror(L, arg, "value expected");
}
LUALIB_API const char *luaL_checklstring (lua_State *L, int arg, size_t *len) {
const char *s = lua_tolstring(L, arg, len);
if (!s) tag_error(L, arg, LUA_TSTRING);
return s;
}
LUALIB_API const char *luaL_optlstring (lua_State *L, int arg,
const char *def, size_t *len) {
if (lua_isnoneornil(L, arg)) {
if (len)
*len = (def ? strlen(def) : 0);
return def;
}
else return luaL_checklstring(L, arg, len);
}
LUALIB_API lua_Number luaL_checknumber (lua_State *L, int arg) {
int isnum;
lua_Number d = lua_tonumberx(L, arg, &isnum);
if (!isnum)
tag_error(L, arg, LUA_TNUMBER);
return d;
}
LUALIB_API lua_Number luaL_optnumber (lua_State *L, int arg, lua_Number def) {
return luaL_opt(L, luaL_checknumber, arg, def);
}
static void interror (lua_State *L, int arg) {
if (lua_isnumber(L, arg))
luaL_argerror(L, arg, "number has no integer representation");
else
tag_error(L, arg, LUA_TNUMBER);
}
LUALIB_API lua_Integer luaL_checkinteger (lua_State *L, int arg) {
int isnum;
lua_Integer d = lua_tointegerx(L, arg, &isnum);
if (!isnum) {
interror(L, arg);
}
return d;
}
LUALIB_API lua_Integer luaL_optinteger (lua_State *L, int arg,
lua_Integer def) {
return luaL_opt(L, luaL_checkinteger, arg, def);
}
/* }====================================================== */
/*
** {======================================================
** Generic Buffer manipulation
** =======================================================
*/
/* userdata to box arbitrary data */
typedef struct UBox {
void *box;
size_t bsize;
} UBox;
static void *resizebox (lua_State *L, int idx, size_t newsize) {
void *ud;
lua_Alloc allocf = lua_getallocf(L, &ud);
UBox *box = (UBox *)lua_touserdata(L, idx);
void *temp = allocf(ud, box->box, box->bsize, newsize);
if (temp == NULL && newsize > 0) /* allocation error? */
luaL_error(L, "not enough memory");
box->box = temp;
box->bsize = newsize;
return temp;
}
static int boxgc (lua_State *L) {
resizebox(L, 1, 0);
return 0;
}
static const luaL_Reg boxmt[] = { /* box metamethods */
{"__gc", boxgc},
{"__close", boxgc},
{NULL, NULL}
};
static void newbox (lua_State *L) {
UBox *box = (UBox *)lua_newuserdatauv(L, sizeof(UBox), 0);
box->box = NULL;
box->bsize = 0;
if (luaL_newmetatable(L, "_UBOX*")) /* creating metatable? */
luaL_setfuncs(L, boxmt, 0); /* set its metamethods */
lua_setmetatable(L, -2);
}
/*
** check whether buffer is using a userdata on the stack as a temporary
** buffer
*/
#define buffonstack(B) ((B)->b != (B)->init.b)
/*
** Compute new size for buffer 'B', enough to accommodate extra 'sz'
** bytes.
*/
static size_t newbuffsize (luaL_Buffer *B, size_t sz) {
size_t newsize = B->size * 2; /* double buffer size */
if (MAX_SIZET - sz < B->n) /* overflow in (B->n + sz)? */
return luaL_error(B->L, "buffer too large");
if (newsize < B->n + sz) /* double is not big enough? */
newsize = B->n + sz;
return newsize;
}
/*
** Returns a pointer to a free area with at least 'sz' bytes in buffer
** 'B'. 'boxidx' is the relative position in the stack where the
** buffer's box is or should be.
*/
static char *prepbuffsize (luaL_Buffer *B, size_t sz, int boxidx) {
if (B->size - B->n >= sz) /* enough space? */
return B->b + B->n;
else {
lua_State *L = B->L;
char *newbuff;
size_t newsize = newbuffsize(B, sz);
/* create larger buffer */
if (buffonstack(B)) /* buffer already has a box? */
newbuff = (char *)resizebox(L, boxidx, newsize); /* resize it */
else { /* no box yet */
lua_pushnil(L); /* reserve slot for final result */
newbox(L); /* create a new box */
/* move box (and slot) to its intended position */
lua_rotate(L, boxidx - 1, 2);
lua_toclose(L, boxidx);
newbuff = (char *)resizebox(L, boxidx, newsize);
memcpy(newbuff, B->b, B->n * sizeof(char)); /* copy original content */
}
B->b = newbuff;
B->size = newsize;
return newbuff + B->n;
}
}
/*
** returns a pointer to a free area with at least 'sz' bytes
*/
LUALIB_API char *luaL_prepbuffsize (luaL_Buffer *B, size_t sz) {
return prepbuffsize(B, sz, -1);
}
LUALIB_API void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l) {
if (l > 0) { /* avoid 'memcpy' when 's' can be NULL */
char *b = prepbuffsize(B, l, -1);
memcpy(b, s, l * sizeof(char));
luaL_addsize(B, l);
}
}
LUALIB_API void luaL_addstring (luaL_Buffer *B, const char *s) {
luaL_addlstring(B, s, strlen(s));
}
LUALIB_API void luaL_pushresult (luaL_Buffer *B) {
lua_State *L = B->L;
lua_pushlstring(L, B->b, B->n);
if (buffonstack(B)) {
lua_copy(L, -1, -3); /* move string to reserved slot */
lua_pop(L, 2); /* pop string and box (closing the box) */
}
}
LUALIB_API void luaL_pushresultsize (luaL_Buffer *B, size_t sz) {
luaL_addsize(B, sz);
luaL_pushresult(B);
}
/*
** 'luaL_addvalue' is the only function in the Buffer system where the
** box (if existent) is not on the top of the stack. So, instead of
** calling 'luaL_addlstring', it replicates the code using -2 as the
** last argument to 'prepbuffsize', signaling that the box is (or will
** be) bellow the string being added to the buffer. (Box creation can
** trigger an emergency GC, so we should not remove the string from the
** stack before we have the space guaranteed.)
*/
LUALIB_API void luaL_addvalue (luaL_Buffer *B) {
lua_State *L = B->L;
size_t len;
const char *s = lua_tolstring(L, -1, &len);
char *b = prepbuffsize(B, len, -2);
memcpy(b, s, len * sizeof(char));
luaL_addsize(B, len);
lua_pop(L, 1); /* pop string */
}
LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B) {
B->L = L;
B->b = B->init.b;
B->n = 0;
B->size = LUAL_BUFFERSIZE;
}
LUALIB_API char *luaL_buffinitsize (lua_State *L, luaL_Buffer *B, size_t sz) {
luaL_buffinit(L, B);
return prepbuffsize(B, sz, -1);
}
/* }====================================================== */
/*
** {======================================================
** Reference system
** =======================================================
*/
/* index of free-list header */
#define freelist 0
LUALIB_API int luaL_ref (lua_State *L, int t) {
int ref;
if (lua_isnil(L, -1)) {
lua_pop(L, 1); /* remove from stack */
return LUA_REFNIL; /* 'nil' has a unique fixed reference */
}
t = lua_absindex(L, t);
lua_rawgeti(L, t, freelist); /* get first free element */
ref = (int)lua_tointeger(L, -1); /* ref = t[freelist] */
lua_pop(L, 1); /* remove it from stack */
if (ref != 0) { /* any free element? */
lua_rawgeti(L, t, ref); /* remove it from list */
lua_rawseti(L, t, freelist); /* (t[freelist] = t[ref]) */
}
else /* no free elements */
ref = (int)lua_rawlen(L, t) + 1; /* get a new reference */
lua_rawseti(L, t, ref);
return ref;
}
LUALIB_API void luaL_unref (lua_State *L, int t, int ref) {
if (ref >= 0) {
t = lua_absindex(L, t);
lua_rawgeti(L, t, freelist);
lua_rawseti(L, t, ref); /* t[ref] = t[freelist] */
lua_pushinteger(L, ref);
lua_rawseti(L, t, freelist); /* t[freelist] = ref */
}
}
/* }====================================================== */
/*
** {======================================================
** Load functions
** =======================================================
*/
typedef struct LoadF {
int n; /* number of pre-read characters */
FILE *f; /* file being read */
char buff[BUFSIZ]; /* area for reading file */
} LoadF;
static const char *getF (lua_State *L, void *ud, size_t *size) {
LoadF *lf = (LoadF *)ud;
(void)L; /* not used */
if (lf->n > 0) { /* are there pre-read characters to be read? */
*size = lf->n; /* return them (chars already in buffer) */
lf->n = 0; /* no more pre-read characters */
}
else { /* read a block from file */
/* 'fread' can return > 0 *and* set the EOF flag. If next call to
'getF' called 'fread', it might still wait for user input.
The next check avoids this problem. */
if (feof(lf->f)) return NULL;
*size = fread(lf->buff, 1, sizeof(lf->buff), lf->f); /* read block */
}
return lf->buff;
}
static int errfile (lua_State *L, const char *what, int fnameindex) {
const char *serr = strerror(errno);
const char *filename = lua_tostring(L, fnameindex) + 1;
lua_pushfstring(L, "cannot %s %s: %s", what, filename, serr);
lua_remove(L, fnameindex);
return LUA_ERRFILE;
}
static int skipBOM (LoadF *lf) {
const char *p = "\xEF\xBB\xBF"; /* UTF-8 BOM mark */
int c;
lf->n = 0;
do {
c = getc(lf->f);
if (c == EOF || c != *(const unsigned char *)p++) return c;
lf->buff[lf->n++] = c; /* to be read by the parser */
} while (*p != '\0');
lf->n = 0; /* prefix matched; discard it */
return getc(lf->f); /* return next character */
}
/*
** reads the first character of file 'f' and skips an optional BOM mark
** in its beginning plus its first line if it starts with '#'. Returns
** true if it skipped the first line. In any case, '*cp' has the
** first "valid" character of the file (after the optional BOM and
** a first-line comment).
*/
static int skipcomment (LoadF *lf, int *cp) {
int c = *cp = skipBOM(lf);
if (c == '#') { /* first line is a comment (Unix exec. file)? */
do { /* skip first line */
c = getc(lf->f);
} while (c != EOF && c != '\n');
*cp = getc(lf->f); /* skip end-of-line, if present */
return 1; /* there was a comment */
}
else return 0; /* no comment */
}
LUALIB_API int luaL_loadfilex (lua_State *L, const char *filename,
const char *mode) {
LoadF lf;
int status, readstatus;
int c;
int fnameindex = lua_gettop(L) + 1; /* index of filename on the stack */
if (filename == NULL) {
lua_pushliteral(L, "=stdin");
lf.f = stdin;
}
else {
lua_pushfstring(L, "@%s", filename);
lf.f = fopen(filename, "r");
if (lf.f == NULL) return errfile(L, "open", fnameindex);
}
if (skipcomment(&lf, &c)) /* read initial portion */
lf.buff[lf.n++] = '\n'; /* add line to correct line numbers */
if (c == LUA_SIGNATURE[0] && filename) { /* binary file? */
lf.f = freopen(filename, "rb", lf.f); /* reopen in binary mode */
if (lf.f == NULL) return errfile(L, "reopen", fnameindex);
skipcomment(&lf, &c); /* re-read initial portion */
}
if (c != EOF)
lf.buff[lf.n++] = c; /* 'c' is the first character of the stream */
status = lua_load(L, getF, &lf, lua_tostring(L, -1), mode);
readstatus = ferror(lf.f);
if (filename) fclose(lf.f); /* close file (even in case of errors) */
if (readstatus) {
lua_settop(L, fnameindex); /* ignore results from 'lua_load' */
return errfile(L, "read", fnameindex);
}
lua_remove(L, fnameindex);
return status;
}
typedef struct LoadS {
const char *s;
size_t size;
} LoadS;
static const char *getS (lua_State *L, void *ud, size_t *size) {
LoadS *ls = (LoadS *)ud;
(void)L; /* not used */
if (ls->size == 0) return NULL;
*size = ls->size;
ls->size = 0;
return ls->s;
}
LUALIB_API int luaL_loadbufferx (lua_State *L, const char *buff, size_t size,
const char *name, const char *mode) {
LoadS ls;
ls.s = buff;
ls.size = size;
return lua_load(L, getS, &ls, name, mode);
}
LUALIB_API int luaL_loadstring (lua_State *L, const char *s) {
return luaL_loadbuffer(L, s, strlen(s), s);
}
/* }====================================================== */
LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *event) {
if (!lua_getmetatable(L, obj)) /* no metatable? */
return LUA_TNIL;
else {
int tt;
lua_pushstring(L, event);
tt = lua_rawget(L, -2);
if (tt == LUA_TNIL) /* is metafield nil? */
lua_pop(L, 2); /* remove metatable and metafield */
else
lua_remove(L, -2); /* remove only metatable */
return tt; /* return metafield type */
}
}
LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event) {
obj = lua_absindex(L, obj);
if (luaL_getmetafield(L, obj, event) == LUA_TNIL) /* no metafield? */
return 0;
lua_pushvalue(L, obj);
lua_call(L, 1, 1);
return 1;
}
LUALIB_API lua_Integer luaL_len (lua_State *L, int idx) {
lua_Integer l;
int isnum;
lua_len(L, idx);
l = lua_tointegerx(L, -1, &isnum);
if (!isnum)
luaL_error(L, "object length is not an integer");
lua_pop(L, 1); /* remove object */
return l;
}
LUALIB_API const char *luaL_tolstring (lua_State *L, int idx, size_t *len) {
if (luaL_callmeta(L, idx, "__tostring")) { /* metafield? */
if (!lua_isstring(L, -1))
luaL_error(L, "'__tostring' must return a string");
}
else {
switch (lua_type(L, idx)) {
case LUA_TNUMBER: {
if (lua_isinteger(L, idx))
lua_pushfstring(L, "%I", (LUAI_UACINT)lua_tointeger(L, idx));
else
lua_pushfstring(L, "%f", (LUAI_UACNUMBER)lua_tonumber(L, idx));
break;
}
case LUA_TSTRING:
lua_pushvalue(L, idx);
break;
case LUA_TBOOLEAN:
lua_pushstring(L, (lua_toboolean(L, idx) ? "true" : "false"));
break;
case LUA_TNIL:
lua_pushliteral(L, "nil");
break;
default: {
int tt = luaL_getmetafield(L, idx, "__name"); /* try name */
const char *kind = (tt == LUA_TSTRING) ? lua_tostring(L, -1) :
luaL_typename(L, idx);
lua_pushfstring(L, "%s: %p", kind, lua_topointer(L, idx));
if (tt != LUA_TNIL)
lua_remove(L, -2); /* remove '__name' */
break;
}
}
}
return lua_tolstring(L, -1, len);
}
/*
** set functions from list 'l' into table at top - 'nup'; each
** function gets the 'nup' elements at the top as upvalues.
** Returns with only the table at the stack.
*/
LUALIB_API void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) {
luaL_checkstack(L, nup, "too many upvalues");
for (; l->name != NULL; l++) { /* fill the table with given functions */
if (l->func == NULL) /* place holder? */
lua_pushboolean(L, 0);
else {
int i;
for (i = 0; i < nup; i++) /* copy upvalues to the top */
lua_pushvalue(L, -nup);
lua_pushcclosure(L, l->func, nup); /* closure with those upvalues */
}
lua_setfield(L, -(nup + 2), l->name);
}
lua_pop(L, nup); /* remove upvalues */
}
/*
** ensure that stack[idx][fname] has a table and push that table
** into the stack
*/
LUALIB_API int luaL_getsubtable (lua_State *L, int idx, const char *fname) {
if (lua_getfield(L, idx, fname) == LUA_TTABLE)
return 1; /* table already there */
else {
lua_pop(L, 1); /* remove previous result */
idx = lua_absindex(L, idx);
lua_newtable(L);
lua_pushvalue(L, -1); /* copy to be left at top */
lua_setfield(L, idx, fname); /* assign new table to field */
return 0; /* false, because did not find table there */
}
}
/*
** Stripped-down 'require': After checking "loaded" table, calls 'openf'
** to open a module, registers the result in 'package.loaded' table and,
** if 'glb' is true, also registers the result in the global table.
** Leaves resulting module on the top.
*/
LUALIB_API void luaL_requiref (lua_State *L, const char *modname,
lua_CFunction openf, int glb) {
luaL_getsubtable(L, LUA_REGISTRYINDEX, LUA_LOADED_TABLE);
lua_getfield(L, -1, modname); /* LOADED[modname] */
if (!lua_toboolean(L, -1)) { /* package not already loaded? */
lua_pop(L, 1); /* remove field */
lua_pushcfunction(L, openf);
lua_pushstring(L, modname); /* argument to open function */
lua_call(L, 1, 1); /* call 'openf' to open module */
lua_pushvalue(L, -1); /* make copy of module (call result) */
lua_setfield(L, -3, modname); /* LOADED[modname] = module */
}
lua_remove(L, -2); /* remove LOADED table */
if (glb) {
lua_pushvalue(L, -1); /* copy of module */
lua_setglobal(L, modname); /* _G[modname] = module */
}
}
LUALIB_API void luaL_addgsub (luaL_Buffer *b, const char *s,
const char *p, const char *r) {
const char *wild;
size_t l = strlen(p);
while ((wild = strstr(s, p)) != NULL) {
luaL_addlstring(b, s, wild - s); /* push prefix */
luaL_addstring(b, r); /* push replacement in place of pattern */
s = wild + l; /* continue after 'p' */
}
luaL_addstring(b, s); /* push last suffix */
}
LUALIB_API const char *luaL_gsub (lua_State *L, const char *s,
const char *p, const char *r) {
luaL_Buffer b;
luaL_buffinit(L, &b);
luaL_addgsub(&b, s, p, r);
luaL_pushresult(&b);
return lua_tostring(L, -1);
}
static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {
(void)ud; (void)osize; /* not used */
if (nsize == 0) {
free(ptr);
return NULL;
}
else
return realloc(ptr, nsize);
}
static int panic (lua_State *L) {
const char *msg = lua_tostring(L, -1);
if (msg == NULL) msg = "error object is not a string";
lua_writestringerror("PANIC: unprotected error in call to Lua API (%s)\n",
msg);
return 0; /* return to Lua to abort */
}
/*
** Emit a warning. '*warnstate' means:
** 0 - warning system is off;
** 1 - ready to start a new message;
** 2 - previous message is to be continued.
*/
static void warnf (void *ud, const char *message, int tocont) {
int *warnstate = (int *)ud;
if (*warnstate != 2 && !tocont && *message == '@') { /* control message? */
if (strcmp(message, "@off") == 0)
*warnstate = 0;
else if (strcmp(message, "@on") == 0)
*warnstate = 1;
return;
}
else if (*warnstate == 0) /* warnings off? */
return;
if (*warnstate == 1) /* previous message was the last? */
lua_writestringerror("%s", "Lua warning: "); /* start a new warning */
lua_writestringerror("%s", message); /* write message */
if (tocont) /* not the last part? */
*warnstate = 2; /* to be continued */
else { /* last part */
lua_writestringerror("%s", "\n"); /* finish message with end-of-line */
*warnstate = 1; /* ready to start a new message */
}
}
LUALIB_API lua_State *luaL_newstate (void) {
lua_State *L = lua_newstate(l_alloc, NULL);
if (L) {
int *warnstate; /* space for warning state */
lua_atpanic(L, &panic);
warnstate = (int *)lua_newuserdatauv(L, sizeof(int), 0);
luaL_ref(L, LUA_REGISTRYINDEX); /* make sure it won't be collected */
*warnstate = 0; /* default is warnings off */
lua_setwarnf(L, warnf, warnstate);
}
return L;
}
LUALIB_API void luaL_checkversion_ (lua_State *L, lua_Number ver, size_t sz) {
lua_Number v = lua_version(L);
if (sz != LUAL_NUMSIZES) /* check numeric types */
luaL_error(L, "core and library have incompatible numeric types");
else if (v != ver)
luaL_error(L, "version mismatch: app. needs %f, Lua core provides %f",
(LUAI_UACNUMBER)ver, (LUAI_UACNUMBER)v);
}
LBASELIB¶
/*
** $Id: lbaselib.c $
** Basic library
** See Copyright Notice in lua.h
*/
#define lbaselib_c
#define LUA_LIB
#include "lprefix.h"
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "_native_lua_config.h" /* native Lua */
static int luaB_print (lua_State *L) {
int n = lua_gettop(L); /* number of arguments */
int i;
for (i = 1; i <= n; i++) { /* for each argument */
size_t l;
const char *s = luaL_tolstring(L, i, &l); /* convert it to string */
if (i > 1) /* not the first element? */
lua_writestring("\t", 1); /* add a tab before it */
lua_writestring(s, l); /* print it */
lua_pop(L, 1); /* pop result */
}
lua_writeline();
return 0;
}
/*
** Creates a warning with all given arguments.
** Check first for errors; otherwise an error may interrupt
** the composition of a warning, leaving it unfinished.
*/
static int luaB_warn (lua_State *L) {
int n = lua_gettop(L); /* number of arguments */
int i;
luaL_checkstring(L, 1); /* at least one argument */
for (i = 2; i <= n; i++)
luaL_checkstring(L, i); /* make sure all arguments are strings */
for (i = 1; i < n; i++) /* compose warning */
lua_warning(L, lua_tostring(L, i), 1);
lua_warning(L, lua_tostring(L, n), 0); /* close warning */
return 0;
}
#define SPACECHARS " \f\n\r\t\v"
static const char *b_str2int (const char *s, int base, lua_Integer *pn) {
lua_Unsigned n = 0;
int neg = 0;
s += strspn(s, SPACECHARS); /* skip initial spaces */
if (*s == '-') { s++; neg = 1; } /* handle sign */
else if (*s == '+') s++;
if (!isalnum((unsigned char)*s)) /* no digit? */
return NULL;
do {
int digit = (isdigit((unsigned char)*s)) ? *s - '0'
: (toupper((unsigned char)*s) - 'A') + 10;
if (digit >= base) return NULL; /* invalid numeral */
n = n * base + digit;
s++;
} while (isalnum((unsigned char)*s));
s += strspn(s, SPACECHARS); /* skip trailing spaces */
*pn = (lua_Integer)((neg) ? (0u - n) : n);
return s;
}
static int luaB_tonumber (lua_State *L) {
if (lua_isnoneornil(L, 2)) { /* standard conversion? */
if (lua_type(L, 1) == LUA_TNUMBER) { /* already a number? */
lua_settop(L, 1); /* yes; return it */
return 1;
}
else {
size_t l;
const char *s = lua_tolstring(L, 1, &l);
if (s != NULL && lua_stringtonumber(L, s) == l + 1)
return 1; /* successful conversion to number */
/* else not a number */
luaL_checkany(L, 1); /* (but there must be some parameter) */
}
}
else {
size_t l;
const char *s;
lua_Integer n = 0; /* to avoid warnings */
lua_Integer base = luaL_checkinteger(L, 2);
luaL_checktype(L, 1, LUA_TSTRING); /* no numbers as strings */
s = lua_tolstring(L, 1, &l);
luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");
if (b_str2int(s, (int)base, &n) == s + l) {
lua_pushinteger(L, n);
return 1;
} /* else not a number */
} /* else not a number */
luaL_pushfail(L); /* not a number */
return 1;
}
static int luaB_error (lua_State *L) {
int level = (int)luaL_optinteger(L, 2, 1);
lua_settop(L, 1);
if (lua_type(L, 1) == LUA_TSTRING && level > 0) {
luaL_where(L, level); /* add extra information */
lua_pushvalue(L, 1);
lua_concat(L, 2);
}
return lua_error(L);
}
static int luaB_getmetatable (lua_State *L) {
luaL_checkany(L, 1);
if (!lua_getmetatable(L, 1)) {
lua_pushnil(L);
return 1; /* no metatable */
}
luaL_getmetafield(L, 1, "__metatable");
return 1; /* returns either __metatable field (if present) or metatable */
}
static int luaB_setmetatable (lua_State *L) {
int t = lua_type(L, 2);
luaL_checktype(L, 1, LUA_TTABLE);
luaL_argexpected(L, t == LUA_TNIL || t == LUA_TTABLE, 2, "nil or table");
if (luaL_getmetafield(L, 1, "__metatable") != LUA_TNIL)
return luaL_error(L, "cannot change a protected metatable");
lua_settop(L, 2);
lua_setmetatable(L, 1);
return 1;
}
static int luaB_rawequal (lua_State *L) {
luaL_checkany(L, 1);
luaL_checkany(L, 2);
lua_pushboolean(L, lua_rawequal(L, 1, 2));
return 1;
}
static int luaB_rawlen (lua_State *L) {
int t = lua_type(L, 1);
luaL_argexpected(L, t == LUA_TTABLE || t == LUA_TSTRING, 1,
"table or string");
lua_pushinteger(L, lua_rawlen(L, 1));
return 1;
}
static int luaB_rawget (lua_State *L) {
luaL_checktype(L, 1, LUA_TTABLE);
luaL_checkany(L, 2);
lua_settop(L, 2);
lua_rawget(L, 1);
return 1;
}
static int luaB_rawset (lua_State *L) {
luaL_checktype(L, 1, LUA_TTABLE);
luaL_checkany(L, 2);
luaL_checkany(L, 3);
lua_settop(L, 3);
lua_rawset(L, 1);
return 1;
}
static int pushmode (lua_State *L, int oldmode) {
lua_pushstring(L, (oldmode == LUA_GCINC) ? "incremental" : "generational");
return 1;
}
static int luaB_collectgarbage (lua_State *L) {
static const char *const opts[] = {"stop", "restart", "collect",
"count", "step", "setpause", "setstepmul",
"isrunning", "generational", "incremental", NULL};
static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT,
LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL,
LUA_GCISRUNNING, LUA_GCGEN, LUA_GCINC};
int o = optsnum[luaL_checkoption(L, 1, "collect", opts)];
switch (o) {
case LUA_GCCOUNT: {
int k = lua_gc(L, o);
int b = lua_gc(L, LUA_GCCOUNTB);
lua_pushnumber(L, (lua_Number)k + ((lua_Number)b/1024));
return 1;
}
case LUA_GCSTEP: {
int step = (int)luaL_optinteger(L, 2, 0);
int res = lua_gc(L, o, step);
lua_pushboolean(L, res);
return 1;
}
case LUA_GCSETPAUSE:
case LUA_GCSETSTEPMUL: {
int p = (int)luaL_optinteger(L, 2, 0);
int previous = lua_gc(L, o, p);
lua_pushinteger(L, previous);
return 1;
}
case LUA_GCISRUNNING: {
int res = lua_gc(L, o);
lua_pushboolean(L, res);
return 1;
}
case LUA_GCGEN: {
int minormul = (int)luaL_optinteger(L, 2, 0);
int majormul = (int)luaL_optinteger(L, 3, 0);
return pushmode(L, lua_gc(L, o, minormul, majormul));
}
case LUA_GCINC: {
int pause = (int)luaL_optinteger(L, 2, 0);
int stepmul = (int)luaL_optinteger(L, 3, 0);
int stepsize = (int)luaL_optinteger(L, 4, 0);
return pushmode(L, lua_gc(L, o, pause, stepmul, stepsize));
}
default: {
int res = lua_gc(L, o);
lua_pushinteger(L, res);
return 1;
}
}
}
static int luaB_type (lua_State *L) {
int t = lua_type(L, 1);
luaL_argcheck(L, t != LUA_TNONE, 1, "value expected");
lua_pushstring(L, lua_typename(L, t));
return 1;
}
static int luaB_next (lua_State *L) {
luaL_checktype(L, 1, LUA_TTABLE);
lua_settop(L, 2); /* create a 2nd argument if there isn't one */
if (lua_next(L, 1))
return 2;
else {
lua_pushnil(L);
return 1;
}
}
static int luaB_pairs (lua_State *L) {
luaL_checkany(L, 1);
if (luaL_getmetafield(L, 1, "__pairs") == LUA_TNIL) { /* no metamethod? */
lua_pushcfunction(L, luaB_next); /* will return generator, */
lua_pushvalue(L, 1); /* state, */
lua_pushnil(L); /* and initial value */
}
else {
lua_pushvalue(L, 1); /* argument 'self' to metamethod */
lua_call(L, 1, 3); /* get 3 values from metamethod */
}
return 3;
}
/*
** Traversal function for 'ipairs'
*/
static int ipairsaux (lua_State *L) {
lua_Integer i = luaL_checkinteger(L, 2) + 1;
lua_pushinteger(L, i);
return (lua_geti(L, 1, i) == LUA_TNIL) ? 1 : 2;
}
/*
** 'ipairs' function. Returns 'ipairsaux', given "table", 0.
** (The given "table" may not be a table.)
*/
static int luaB_ipairs (lua_State *L) {
luaL_checkany(L, 1);
lua_pushcfunction(L, ipairsaux); /* iteration function */
lua_pushvalue(L, 1); /* state */
lua_pushinteger(L, 0); /* initial value */
return 3;
}
static int load_aux (lua_State *L, int status, int envidx) {
if (status == LUA_OK) {
if (envidx != 0) { /* 'env' parameter? */
lua_pushvalue(L, envidx); /* environment for loaded function */
if (!lua_setupvalue(L, -2, 1)) /* set it as 1st upvalue */
lua_pop(L, 1); /* remove 'env' if not used by previous call */
}
return 1;
}
else { /* error (message is on top of the stack) */
luaL_pushfail(L);
lua_insert(L, -2); /* put before error message */
return 2; /* return fail plus error message */
}
}
static int luaB_loadfile (lua_State *L) {
const char *fname = luaL_optstring(L, 1, NULL);
const char *mode = luaL_optstring(L, 2, NULL);
int env = (!lua_isnone(L, 3) ? 3 : 0); /* 'env' index or 0 if no 'env' */
int status = luaL_loadfilex(L, fname, mode);
return load_aux(L, status, env);
}
/*
** {======================================================
** Generic Read function
** =======================================================
*/
/*
** reserved slot, above all arguments, to hold a copy of the returned
** string to avoid it being collected while parsed. 'load' has four
** optional arguments (chunk, source name, mode, and environment).
*/
#define RESERVEDSLOT 5
/*
** Reader for generic 'load' function: 'lua_load' uses the
** stack for internal stuff, so the reader cannot change the
** stack top. Instead, it keeps its resulting string in a
** reserved slot inside the stack.
*/
static const char *generic_reader (lua_State *L, void *ud, size_t *size) {
(void)(ud); /* not used */
luaL_checkstack(L, 2, "too many nested functions");
lua_pushvalue(L, 1); /* get function */
lua_call(L, 0, 1); /* call it */
if (lua_isnil(L, -1)) {
lua_pop(L, 1); /* pop result */
*size = 0;
return NULL;
}
else if (!lua_isstring(L, -1))
luaL_error(L, "reader function must return a string");
lua_replace(L, RESERVEDSLOT); /* save string in reserved slot */
return lua_tolstring(L, RESERVEDSLOT, size);
}
static int luaB_load (lua_State *L) {
int status;
size_t l;
const char *s = lua_tolstring(L, 1, &l);
const char *mode = luaL_optstring(L, 3, "bt");
int env = (!lua_isnone(L, 4) ? 4 : 0); /* 'env' index or 0 if no 'env' */
if (s != NULL) { /* loading a string? */
const char *chunkname = luaL_optstring(L, 2, s);
status = luaL_loadbufferx(L, s, l, chunkname, mode);
}
else { /* loading from a reader function */
const char *chunkname = luaL_optstring(L, 2, "=(load)");
luaL_checktype(L, 1, LUA_TFUNCTION);
lua_settop(L, RESERVEDSLOT); /* create reserved slot */
status = lua_load(L, generic_reader, NULL, chunkname, mode);
}
return load_aux(L, status, env);
}
/* }====================================================== */
static int dofilecont (lua_State *L, int d1, lua_KContext d2) {
(void)d1; (void)d2; /* only to match 'lua_Kfunction' prototype */
return lua_gettop(L) - 1;
}
static int luaB_dofile (lua_State *L) {
const char *fname = luaL_optstring(L, 1, NULL);
lua_settop(L, 1);
if (luaL_loadfile(L, fname) != LUA_OK)
return lua_error(L);
lua_callk(L, 0, LUA_MULTRET, 0, dofilecont);
return dofilecont(L, 0, 0);
}
static int luaB_assert (lua_State *L) {
if (lua_toboolean(L, 1)) /* condition is true? */
return lua_gettop(L); /* return all arguments */
else { /* error */
luaL_checkany(L, 1); /* there must be a condition */
lua_remove(L, 1); /* remove it */
lua_pushliteral(L, "assertion failed!"); /* default message */
lua_settop(L, 1); /* leave only message (default if no other one) */
return luaB_error(L); /* call 'error' */
}
}
static int luaB_select (lua_State *L) {
int n = lua_gettop(L);
if (lua_type(L, 1) == LUA_TSTRING && *lua_tostring(L, 1) == '#') {
lua_pushinteger(L, n-1);
return 1;
}
else {
lua_Integer i = luaL_checkinteger(L, 1);
if (i < 0) i = n + i;
else if (i > n) i = n;
luaL_argcheck(L, 1 <= i, 1, "index out of range");
return n - (int)i;
}
}
/*
** Continuation function for 'pcall' and 'xpcall'. Both functions
** already pushed a 'true' before doing the call, so in case of success
** 'finishpcall' only has to return everything in the stack minus
** 'extra' values (where 'extra' is exactly the number of items to be
** ignored).
*/
static int finishpcall (lua_State *L, int status, lua_KContext extra) {
if (status != LUA_OK && status != LUA_YIELD) { /* error? */
lua_pushboolean(L, 0); /* first result (false) */
lua_pushvalue(L, -2); /* error message */
return 2; /* return false, msg */
}
else
return lua_gettop(L) - (int)extra; /* return all results */
}
static int luaB_pcall (lua_State *L) {
int status;
luaL_checkany(L, 1);
lua_pushboolean(L, 1); /* first result if no errors */
lua_insert(L, 1); /* put it in place */
status = lua_pcallk(L, lua_gettop(L) - 2, LUA_MULTRET, 0, 0, finishpcall);
return finishpcall(L, status, 0);
}
/*
** Do a protected call with error handling. After 'lua_rotate', the
** stack will have <f, err, true, f, [args...]>; so, the function passes
** 2 to 'finishpcall' to skip the 2 first values when returning results.
*/
static int luaB_xpcall (lua_State *L) {
int status;
int n = lua_gettop(L);
luaL_checktype(L, 2, LUA_TFUNCTION); /* check error function */
lua_pushboolean(L, 1); /* first result */
lua_pushvalue(L, 1); /* function */
lua_rotate(L, 3, 2); /* move them below function's arguments */
status = lua_pcallk(L, n - 2, LUA_MULTRET, 2, 2, finishpcall);
return finishpcall(L, status, 2);
}
static int luaB_tostring (lua_State *L) {
luaL_checkany(L, 1);
luaL_tolstring(L, 1, NULL);
return 1;
}
static const luaL_Reg base_funcs[] = {
{"assert", luaB_assert},
{"collectgarbage", luaB_collectgarbage},
{"dofile", luaB_dofile},
{"error", luaB_error},
{"getmetatable", luaB_getmetatable},
{"ipairs", luaB_ipairs},
{"loadfile", luaB_loadfile},
{"load", luaB_load},
{"next", luaB_next},
{"pairs", luaB_pairs},
{"pcall", luaB_pcall},
{"print", luaB_print},
{"warn", luaB_warn},
{"rawequal", luaB_rawequal},
{"rawlen", luaB_rawlen},
{"rawget", luaB_rawget},
{"rawset", luaB_rawset},
{"select", luaB_select},
{"setmetatable", luaB_setmetatable},
{"tonumber", luaB_tonumber},
{"tostring", luaB_tostring},
{"type", luaB_type},
{"xpcall", luaB_xpcall},
/* placeholders */
{LUA_GNAME, NULL},
{"_VERSION", NULL},
{NULL, NULL}
};
LUAMOD_API int luaopen_base (lua_State *L) {
/* open lib into global table */
lua_pushglobaltable(L);
luaL_setfuncs(L, base_funcs, 0);
/* set global _G */
lua_pushvalue(L, -1);
lua_setfield(L, -2, LUA_GNAME);
/* set global _VERSION */
lua_pushliteral(L, LUA_VERSION);
lua_setfield(L, -2, "_VERSION");
return 1;
}
LCODE¶
/*
** $Id: lcode.h $
** Code generator for Lua
** See Copyright Notice in lua.h
*/
#ifndef lcode_h
#define lcode_h
#include "llex.h"
#include "lobject.h"
#include "lopcodes.h"
#include "lparser.h"
#include "_native_lua_config.h" /* native Lua */
/*
** Marks the end of a patch list. It is an invalid value both as an absolute
** address, and as a list link (would link an element to itself).
*/
#define NO_JUMP (-1)
/*
** grep "ORDER OPR" if you change these enums (ORDER OP)
*/
typedef enum BinOpr {
/* arithmetic operators */
OPR_ADD, OPR_SUB, OPR_MUL, OPR_MOD, OPR_POW,
OPR_DIV, OPR_IDIV,
/* bitwise operators */
OPR_BAND, OPR_BOR, OPR_BXOR,
OPR_SHL, OPR_SHR,
/* string operator */
OPR_CONCAT,
/* comparison operators */
OPR_EQ, OPR_LT, OPR_LE,
OPR_NE, OPR_GT, OPR_GE,
/* logical operators */
OPR_AND, OPR_OR,
OPR_NOBINOPR
} BinOpr;
/* true if operation is foldable (that is, it is arithmetic or bitwise) */
#define foldbinop(op) ((op) <= OPR_SHR)
#define luaK_codeABC(fs,o,a,b,c) luaK_codeABCk(fs,o,a,b,c,0)
typedef enum UnOpr { OPR_MINUS, OPR_BNOT, OPR_NOT, OPR_LEN, OPR_NOUNOPR } UnOpr;
/* get (pointer to) instruction of given 'expdesc' */
#define getinstruction(fs,e) ((fs)->f->code[(e)->u.info])
#define luaK_setmultret(fs,e) luaK_setreturns(fs, e, LUA_MULTRET)
#define luaK_jumpto(fs,t) luaK_patchlist(fs, luaK_jump(fs), t)
LUAI_FUNC int luaK_code (FuncState *fs, Instruction i);
LUAI_FUNC int luaK_codeABx (FuncState *fs, OpCode o, int A, unsigned int Bx);
LUAI_FUNC int luaK_codeAsBx (FuncState *fs, OpCode o, int A, int Bx);
LUAI_FUNC int luaK_codeABCk (FuncState *fs, OpCode o, int A,
int B, int C, int k);
LUAI_FUNC int luaK_isKint (expdesc *e);
LUAI_FUNC int luaK_exp2const (FuncState *fs, const expdesc *e, TValue *v);
LUAI_FUNC void luaK_fixline (FuncState *fs, int line);
LUAI_FUNC void luaK_nil (FuncState *fs, int from, int n);
LUAI_FUNC void luaK_reserveregs (FuncState *fs, int n);
LUAI_FUNC void luaK_checkstack (FuncState *fs, int n);
LUAI_FUNC void luaK_int (FuncState *fs, int reg, lua_Integer n);
LUAI_FUNC void luaK_dischargevars (FuncState *fs, expdesc *e);
LUAI_FUNC int luaK_exp2anyreg (FuncState *fs, expdesc *e);
LUAI_FUNC void luaK_exp2anyregup (FuncState *fs, expdesc *e);
LUAI_FUNC void luaK_exp2nextreg (FuncState *fs, expdesc *e);
LUAI_FUNC void luaK_exp2val (FuncState *fs, expdesc *e);
LUAI_FUNC int luaK_exp2RK (FuncState *fs, expdesc *e);
LUAI_FUNC void luaK_self (FuncState *fs, expdesc *e, expdesc *key);
LUAI_FUNC void luaK_indexed (FuncState *fs, expdesc *t, expdesc *k);
LUAI_FUNC void luaK_goiftrue (FuncState *fs, expdesc *e);
LUAI_FUNC void luaK_goiffalse (FuncState *fs, expdesc *e);
LUAI_FUNC void luaK_storevar (FuncState *fs, expdesc *var, expdesc *e);
LUAI_FUNC void luaK_setreturns (FuncState *fs, expdesc *e, int nresults);
LUAI_FUNC void luaK_setoneret (FuncState *fs, expdesc *e);
LUAI_FUNC int luaK_jump (FuncState *fs);
LUAI_FUNC void luaK_ret (FuncState *fs, int first, int nret);
LUAI_FUNC void luaK_patchlist (FuncState *fs, int list, int target);
LUAI_FUNC void luaK_patchtohere (FuncState *fs, int list);
LUAI_FUNC void luaK_concat (FuncState *fs, int *l1, int l2);
LUAI_FUNC int luaK_getlabel (FuncState *fs);
LUAI_FUNC void luaK_prefix (FuncState *fs, UnOpr op, expdesc *v, int line);
LUAI_FUNC void luaK_infix (FuncState *fs, BinOpr op, expdesc *v);
LUAI_FUNC void luaK_posfix (FuncState *fs, BinOpr op, expdesc *v1,
expdesc *v2, int line);
LUAI_FUNC void luaK_settablesize (FuncState *fs, int pc,
int ra, int asize, int hsize);
LUAI_FUNC void luaK_setlist (FuncState *fs, int base, int nelems, int tostore);
LUAI_FUNC void luaK_finish (FuncState *fs);
LUAI_FUNC l_noret luaK_semerror (LexState *ls, const char *msg);
#endif
/*
** $Id: lcode.c $
** Code generator for Lua
** See Copyright Notice in lua.h
*/
#define lcode_c
#define LUA_CORE
#include "lprefix.h"
#include <limits.h>
#include <math.h>
#include <stdlib.h>
#include "lua.h"
#include "lcode.h"
#include "ldebug.h"
#include "ldo.h"
#include "lgc.h"
#include "llex.h"
#include "lmem.h"
#include "lobject.h"
#include "lopcodes.h"
#include "lparser.h"
#include "lstring.h"
#include "ltable.h"
#include "lvm.h"
/* Maximum number of registers in a Lua function (must fit in 8 bits) */
#define MAXREGS 255
#define hasjumps(e) ((e)->t != (e)->f)
static int codesJ (FuncState *fs, OpCode o, int sj, int k);
/* semantic error */
l_noret luaK_semerror (LexState *ls, const char *msg) {
ls->t.token = 0; /* remove "near <token>" from final message */
luaX_syntaxerror(ls, msg);
}
/*
** If expression is a numeric constant, fills 'v' with its value
** and returns 1. Otherwise, returns 0.
*/
static int tonumeral (const expdesc *e, TValue *v) {
if (hasjumps(e))
return 0; /* not a numeral */
switch (e->k) {
case VKINT:
if (v) setivalue(v, e->u.ival);
return 1;
case VKFLT:
if (v) setfltvalue(v, e->u.nval);
return 1;
default: return 0;
}
}
/*
** Get the constant value from a constant expression
*/
static TValue *const2val (FuncState *fs, const expdesc *e) {
lua_assert(e->k == VCONST);
return &fs->ls->dyd->actvar.arr[e->u.info].k;
}
/*
** If expression is a constant, fills 'v' with its value
** and returns 1. Otherwise, returns 0.
*/
int luaK_exp2const (FuncState *fs, const expdesc *e, TValue *v) {
if (hasjumps(e))
return 0; /* not a constant */
switch (e->k) {
case VFALSE:
setbfvalue(v);
return 1;
case VTRUE:
setbtvalue(v);
return 1;
case VNIL:
setnilvalue(v);
return 1;
case VKSTR: {
setsvalue(fs->ls->L, v, e->u.strval);
return 1;
}
case VCONST: {
setobj(fs->ls->L, v, const2val(fs, e));
return 1;
}
default: return tonumeral(e, v);
}
}
/*
** Return the previous instruction of the current code. If there
** may be a jump target between the current instruction and the
** previous one, return an invalid instruction (to avoid wrong
** optimizations).
*/
static Instruction *previousinstruction (FuncState *fs) {
static const Instruction invalidinstruction = ~(Instruction)0;
if (fs->pc > fs->lasttarget)
return &fs->f->code[fs->pc - 1]; /* previous instruction */
else
return cast(Instruction*, &invalidinstruction);
}
/*
** Create a OP_LOADNIL instruction, but try to optimize: if the previous
** instruction is also OP_LOADNIL and ranges are compatible, adjust
** range of previous instruction instead of emitting a new one. (For
** instance, 'local a; local b' will generate a single opcode.)
*/
void luaK_nil (FuncState *fs, int from, int n) {
int l = from + n - 1; /* last register to set nil */
Instruction *previous = previousinstruction(fs);
if (GET_OPCODE(*previous) == OP_LOADNIL) { /* previous is LOADNIL? */
int pfrom = GETARG_A(*previous); /* get previous range */
int pl = pfrom + GETARG_B(*previous);
if ((pfrom <= from && from <= pl + 1) ||
(from <= pfrom && pfrom <= l + 1)) { /* can connect both? */
if (pfrom < from) from = pfrom; /* from = min(from, pfrom) */
if (pl > l) l = pl; /* l = max(l, pl) */
SETARG_A(*previous, from);
SETARG_B(*previous, l - from);
return;
} /* else go through */
}
luaK_codeABC(fs, OP_LOADNIL, from, n - 1, 0); /* else no optimization */
}
/*
** Gets the destination address of a jump instruction. Used to traverse
** a list of jumps.
*/
static int getjump (FuncState *fs, int pc) {
int offset = GETARG_sJ(fs->f->code[pc]);
if (offset == NO_JUMP) /* point to itself represents end of list */
return NO_JUMP; /* end of list */
else
return (pc+1)+offset; /* turn offset into absolute position */
}
/*
** Fix jump instruction at position 'pc' to jump to 'dest'.
** (Jump addresses are relative in Lua)
*/
static void fixjump (FuncState *fs, int pc, int dest) {
Instruction *jmp = &fs->f->code[pc];
int offset = dest - (pc + 1);
lua_assert(dest != NO_JUMP);
if (!(-OFFSET_sJ <= offset && offset <= MAXARG_sJ - OFFSET_sJ))
luaX_syntaxerror(fs->ls, "control structure too long");
lua_assert(GET_OPCODE(*jmp) == OP_JMP);
SETARG_sJ(*jmp, offset);
}
/*
** Concatenate jump-list 'l2' into jump-list 'l1'
*/
void luaK_concat (FuncState *fs, int *l1, int l2) {
if (l2 == NO_JUMP) return; /* nothing to concatenate? */
else if (*l1 == NO_JUMP) /* no original list? */
*l1 = l2; /* 'l1' points to 'l2' */
else {
int list = *l1;
int next;
while ((next = getjump(fs, list)) != NO_JUMP) /* find last element */
list = next;
fixjump(fs, list, l2); /* last element links to 'l2' */
}
}
/*
** Create a jump instruction and return its position, so its destination
** can be fixed later (with 'fixjump').
*/
int luaK_jump (FuncState *fs) {
return codesJ(fs, OP_JMP, NO_JUMP, 0);
}
/*
** Code a 'return' instruction
*/
void luaK_ret (FuncState *fs, int first, int nret) {
OpCode op;
switch (nret) {
case 0: op = OP_RETURN0; break;
case 1: op = OP_RETURN1; break;
default: op = OP_RETURN; break;
}
luaK_codeABC(fs, op, first, nret + 1, 0);
}
/*
** Code a "conditional jump", that is, a test or comparison opcode
** followed by a jump. Return jump position.
*/
static int condjump (FuncState *fs, OpCode op, int A, int B, int C, int k) {
luaK_codeABCk(fs, op, A, B, C, k);
return luaK_jump(fs);
}
/*
** returns current 'pc' and marks it as a jump target (to avoid wrong
** optimizations with consecutive instructions not in the same basic block).
*/
int luaK_getlabel (FuncState *fs) {
fs->lasttarget = fs->pc;
return fs->pc;
}
/*
** Returns the position of the instruction "controlling" a given
** jump (that is, its condition), or the jump itself if it is
** unconditional.
*/
static Instruction *getjumpcontrol (FuncState *fs, int pc) {
Instruction *pi = &fs->f->code[pc];
if (pc >= 1 && testTMode(GET_OPCODE(*(pi-1))))
return pi-1;
else
return pi;
}
/*
** Patch destination register for a TESTSET instruction.
** If instruction in position 'node' is not a TESTSET, return 0 ("fails").
** Otherwise, if 'reg' is not 'NO_REG', set it as the destination
** register. Otherwise, change instruction to a simple 'TEST' (produces
** no register value)
*/
static int patchtestreg (FuncState *fs, int node, int reg) {
Instruction *i = getjumpcontrol(fs, node);
if (GET_OPCODE(*i) != OP_TESTSET)
return 0; /* cannot patch other instructions */
if (reg != NO_REG && reg != GETARG_B(*i))
SETARG_A(*i, reg);
else {
/* no register to put value or register already has the value;
change instruction to simple test */
*i = CREATE_ABCk(OP_TEST, GETARG_B(*i), 0, 0, GETARG_k(*i));
}
return 1;
}
/*
** Traverse a list of tests ensuring no one produces a value
*/
static void removevalues (FuncState *fs, int list) {
for (; list != NO_JUMP; list = getjump(fs, list))
patchtestreg(fs, list, NO_REG);
}
/*
** Traverse a list of tests, patching their destination address and
** registers: tests producing values jump to 'vtarget' (and put their
** values in 'reg'), other tests jump to 'dtarget'.
*/
static void patchlistaux (FuncState *fs, int list, int vtarget, int reg,
int dtarget) {
while (list != NO_JUMP) {
int next = getjump(fs, list);
if (patchtestreg(fs, list, reg))
fixjump(fs, list, vtarget);
else
fixjump(fs, list, dtarget); /* jump to default target */
list = next;
}
}
/*
** Path all jumps in 'list' to jump to 'target'.
** (The assert means that we cannot fix a jump to a forward address
** because we only know addresses once code is generated.)
*/
void luaK_patchlist (FuncState *fs, int list, int target) {
lua_assert(target <= fs->pc);
patchlistaux(fs, list, target, NO_REG, target);
}
void luaK_patchtohere (FuncState *fs, int list) {
int hr = luaK_getlabel(fs); /* mark "here" as a jump target */
luaK_patchlist(fs, list, hr);
}
/*
** MAXimum number of successive Instructions WiTHout ABSolute line
** information.
*/
#if !defined(MAXIWTHABS)
#define MAXIWTHABS 120
#endif
/* limit for difference between lines in relative line info. */
#define LIMLINEDIFF 0x80
/*
** Save line info for a new instruction. If difference from last line
** does not fit in a byte, of after that many instructions, save a new
** absolute line info; (in that case, the special value 'ABSLINEINFO'
** in 'lineinfo' signals the existence of this absolute information.)
** Otherwise, store the difference from last line in 'lineinfo'.
*/
static void savelineinfo (FuncState *fs, Proto *f, int line) {
int linedif = line - fs->previousline;
int pc = fs->pc - 1; /* last instruction coded */
if (abs(linedif) >= LIMLINEDIFF || fs->iwthabs++ > MAXIWTHABS) {
luaM_growvector(fs->ls->L, f->abslineinfo, fs->nabslineinfo,
f->sizeabslineinfo, AbsLineInfo, MAX_INT, "lines");
f->abslineinfo[fs->nabslineinfo].pc = pc;
f->abslineinfo[fs->nabslineinfo++].line = line;
linedif = ABSLINEINFO; /* signal that there is absolute information */
fs->iwthabs = 0; /* restart counter */
}
luaM_growvector(fs->ls->L, f->lineinfo, pc, f->sizelineinfo, ls_byte,
MAX_INT, "opcodes");
f->lineinfo[pc] = linedif;
fs->previousline = line; /* last line saved */
}
/*
** Remove line information from the last instruction.
** If line information for that instruction is absolute, set 'iwthabs'
** above its max to force the new (replacing) instruction to have
** absolute line info, too.
*/
static void removelastlineinfo (FuncState *fs) {
Proto *f = fs->f;
int pc = fs->pc - 1; /* last instruction coded */
if (f->lineinfo[pc] != ABSLINEINFO) { /* relative line info? */
fs->previousline -= f->lineinfo[pc]; /* correct last line saved */
fs->iwthabs--; /* undo previous increment */
}
else { /* absolute line information */
lua_assert(f->abslineinfo[fs->nabslineinfo - 1].pc == pc);
fs->nabslineinfo--; /* remove it */
fs->iwthabs = MAXIWTHABS + 1; /* force next line info to be absolute */
}
}
/*
** Remove the last instruction created, correcting line information
** accordingly.
*/
static void removelastinstruction (FuncState *fs) {
removelastlineinfo(fs);
fs->pc--;
}
/*
** Emit instruction 'i', checking for array sizes and saving also its
** line information. Return 'i' position.
*/
int luaK_code (FuncState *fs, Instruction i) {
Proto *f = fs->f;
/* put new instruction in code array */
luaM_growvector(fs->ls->L, f->code, fs->pc, f->sizecode, Instruction,
MAX_INT, "opcodes");
f->code[fs->pc++] = i;
savelineinfo(fs, f, fs->ls->lastline);
return fs->pc - 1; /* index of new instruction */
}
/*
** Format and emit an 'iABC' instruction. (Assertions check consistency
** of parameters versus opcode.)
*/
int luaK_codeABCk (FuncState *fs, OpCode o, int a, int b, int c, int k) {
lua_assert(getOpMode(o) == iABC);
lua_assert(a <= MAXARG_A && b <= MAXARG_B &&
c <= MAXARG_C && (k & ~1) == 0);
return luaK_code(fs, CREATE_ABCk(o, a, b, c, k));
}
/*
** Format and emit an 'iABx' instruction.
*/
int luaK_codeABx (FuncState *fs, OpCode o, int a, unsigned int bc) {
lua_assert(getOpMode(o) == iABx);
lua_assert(a <= MAXARG_A && bc <= MAXARG_Bx);
return luaK_code(fs, CREATE_ABx(o, a, bc));
}
/*
** Format and emit an 'iAsBx' instruction.
*/
int luaK_codeAsBx (FuncState *fs, OpCode o, int a, int bc) {
unsigned int b = bc + OFFSET_sBx;
lua_assert(getOpMode(o) == iAsBx);
lua_assert(a <= MAXARG_A && b <= MAXARG_Bx);
return luaK_code(fs, CREATE_ABx(o, a, b));
}
/*
** Format and emit an 'isJ' instruction.
*/
static int codesJ (FuncState *fs, OpCode o, int sj, int k) {
unsigned int j = sj + OFFSET_sJ;
lua_assert(getOpMode(o) == isJ);
lua_assert(j <= MAXARG_sJ && (k & ~1) == 0);
return luaK_code(fs, CREATE_sJ(o, j, k));
}
/*
** Emit an "extra argument" instruction (format 'iAx')
*/
static int codeextraarg (FuncState *fs, int a) {
lua_assert(a <= MAXARG_Ax);
return luaK_code(fs, CREATE_Ax(OP_EXTRAARG, a));
}
/*
** Emit a "load constant" instruction, using either 'OP_LOADK'
** (if constant index 'k' fits in 18 bits) or an 'OP_LOADKX'
** instruction with "extra argument".
*/
static int luaK_codek (FuncState *fs, int reg, int k) {
if (k <= MAXARG_Bx)
return luaK_codeABx(fs, OP_LOADK, reg, k);
else {
int p = luaK_codeABx(fs, OP_LOADKX, reg, 0);
codeextraarg(fs, k);
return p;
}
}
/*
** Check register-stack level, keeping track of its maximum size
** in field 'maxstacksize'
*/
void luaK_checkstack (FuncState *fs, int n) {
int newstack = fs->freereg + n;
if (newstack > fs->f->maxstacksize) {
if (newstack >= MAXREGS)
luaX_syntaxerror(fs->ls,
"function or expression needs too many registers");
fs->f->maxstacksize = cast_byte(newstack);
}
}
/*
** Reserve 'n' registers in register stack
*/
void luaK_reserveregs (FuncState *fs, int n) {
luaK_checkstack(fs, n);
fs->freereg += n;
}
/*
** Free register 'reg', if it is neither a constant index nor
** a local variable.
)
*/
static void freereg (FuncState *fs, int reg) {
if (reg >= luaY_nvarstack(fs)) {
fs->freereg--;
lua_assert(reg == fs->freereg);
}
}
/*
** Free two registers in proper order
*/
static void freeregs (FuncState *fs, int r1, int r2) {
if (r1 > r2) {
freereg(fs, r1);
freereg(fs, r2);
}
else {
freereg(fs, r2);
freereg(fs, r1);
}
}
/*
** Free register used by expression 'e' (if any)
*/
static void freeexp (FuncState *fs, expdesc *e) {
if (e->k == VNONRELOC)
freereg(fs, e->u.info);
}
/*
** Free registers used by expressions 'e1' and 'e2' (if any) in proper
** order.
*/
static void freeexps (FuncState *fs, expdesc *e1, expdesc *e2) {
int r1 = (e1->k == VNONRELOC) ? e1->u.info : -1;
int r2 = (e2->k == VNONRELOC) ? e2->u.info : -1;
freeregs(fs, r1, r2);
}
/*
** Add constant 'v' to prototype's list of constants (field 'k').
** Use scanner's table to cache position of constants in constant list
** and try to reuse constants. Because some values should not be used
** as keys (nil cannot be a key, integer keys can collapse with float
** keys), the caller must provide a useful 'key' for indexing the cache.
*/
static int addk (FuncState *fs, TValue *key, TValue *v) {
lua_State *L = fs->ls->L;
Proto *f = fs->f;
TValue *idx = luaH_set(L, fs->ls->h, key); /* index scanner table */
int k, oldsize;
if (ttisinteger(idx)) { /* is there an index there? */
k = cast_int(ivalue(idx));
/* correct value? (warning: must distinguish floats from integers!) */
if (k < fs->nk && ttypetag(&f->k[k]) == ttypetag(v) &&
luaV_rawequalobj(&f->k[k], v))
return k; /* reuse index */
}
/* constant not found; create a new entry */
oldsize = f->sizek;
k = fs->nk;
/* numerical value does not need GC barrier;
table has no metatable, so it does not need to invalidate cache */
setivalue(idx, k);
luaM_growvector(L, f->k, k, f->sizek, TValue, MAXARG_Ax, "constants");
while (oldsize < f->sizek) setnilvalue(&f->k[oldsize++]);
setobj(L, &f->k[k], v);
fs->nk++;
luaC_barrier(L, f, v);
return k;
}
/*
** Add a string to list of constants and return its index.
*/
static int stringK (FuncState *fs, TString *s) {
TValue o;
setsvalue(fs->ls->L, &o, s);
return addk(fs, &o, &o); /* use string itself as key */
}
/*
** Add an integer to list of constants and return its index.
** Integers use userdata as keys to avoid collision with floats with
** same value; conversion to 'void*' is used only for hashing, so there
** are no "precision" problems.
*/
static int luaK_intK (FuncState *fs, lua_Integer n) {
TValue k, o;
setpvalue(&k, cast_voidp(cast_sizet(n)));
setivalue(&o, n);
return addk(fs, &k, &o);
}
/*
** Add a float to list of constants and return its index.
*/
static int luaK_numberK (FuncState *fs, lua_Number r) {
TValue o;
setfltvalue(&o, r);
return addk(fs, &o, &o); /* use number itself as key */
}
/*
** Add a false to list of constants and return its index.
*/
static int boolF (FuncState *fs) {
TValue o;
setbfvalue(&o);
return addk(fs, &o, &o); /* use boolean itself as key */
}
/*
** Add a true to list of constants and return its index.
*/
static int boolT (FuncState *fs) {
TValue o;
setbtvalue(&o);
return addk(fs, &o, &o); /* use boolean itself as key */
}
/*
** Add nil to list of constants and return its index.
*/
static int nilK (FuncState *fs) {
TValue k, v;
setnilvalue(&v);
/* cannot use nil as key; instead use table itself to represent nil */
sethvalue(fs->ls->L, &k, fs->ls->h);
return addk(fs, &k, &v);
}
/*
** Check whether 'i' can be stored in an 'sC' operand. Equivalent to
** (0 <= int2sC(i) && int2sC(i) <= MAXARG_C) but without risk of
** overflows in the hidden addition inside 'int2sC'.
*/
static int fitsC (lua_Integer i) {
return (l_castS2U(i) + OFFSET_sC <= cast_uint(MAXARG_C));
}
/*
** Check whether 'i' can be stored in an 'sBx' operand.
*/
static int fitsBx (lua_Integer i) {
return (-OFFSET_sBx <= i && i <= MAXARG_Bx - OFFSET_sBx);
}
void luaK_int (FuncState *fs, int reg, lua_Integer i) {
if (fitsBx(i))
luaK_codeAsBx(fs, OP_LOADI, reg, cast_int(i));
else
luaK_codek(fs, reg, luaK_intK(fs, i));
}
static void luaK_float (FuncState *fs, int reg, lua_Number f) {
lua_Integer fi;
if (luaV_flttointeger(f, &fi, F2Ieq) && fitsBx(fi))
luaK_codeAsBx(fs, OP_LOADF, reg, cast_int(fi));
else
luaK_codek(fs, reg, luaK_numberK(fs, f));
}
/*
** Convert a constant in 'v' into an expression description 'e'
*/
static void const2exp (TValue *v, expdesc *e) {
switch (ttypetag(v)) {
case LUA_VNUMINT:
e->k = VKINT; e->u.ival = ivalue(v);
break;
case LUA_VNUMFLT:
e->k = VKFLT; e->u.nval = fltvalue(v);
break;
case LUA_VFALSE:
e->k = VFALSE;
break;
case LUA_VTRUE:
e->k = VTRUE;
break;
case LUA_VNIL:
e->k = VNIL;
break;
case LUA_VSHRSTR: case LUA_VLNGSTR:
e->k = VKSTR; e->u.strval = tsvalue(v);
break;
default: lua_assert(0);
}
}
/*
** Fix an expression to return the number of results 'nresults'.
** 'e' must be a multi-ret expression (function call or vararg).
*/
void luaK_setreturns (FuncState *fs, expdesc *e, int nresults) {
Instruction *pc = &getinstruction(fs, e);
if (e->k == VCALL) /* expression is an open function call? */
SETARG_C(*pc, nresults + 1);
else {
lua_assert(e->k == VVARARG);
SETARG_C(*pc, nresults + 1);
SETARG_A(*pc, fs->freereg);
luaK_reserveregs(fs, 1);
}
}
/*
** Convert a VKSTR to a VK
*/
static void str2K (FuncState *fs, expdesc *e) {
lua_assert(e->k == VKSTR);
e->u.info = stringK(fs, e->u.strval);
e->k = VK;
}
/*
** Fix an expression to return one result.
** If expression is not a multi-ret expression (function call or
** vararg), it already returns one result, so nothing needs to be done.
** Function calls become VNONRELOC expressions (as its result comes
** fixed in the base register of the call), while vararg expressions
** become VRELOC (as OP_VARARG puts its results where it wants).
** (Calls are created returning one result, so that does not need
** to be fixed.)
*/
void luaK_setoneret (FuncState *fs, expdesc *e) {
if (e->k == VCALL) { /* expression is an open function call? */
/* already returns 1 value */
lua_assert(GETARG_C(getinstruction(fs, e)) == 2);
e->k = VNONRELOC; /* result has fixed position */
e->u.info = GETARG_A(getinstruction(fs, e));
}
else if (e->k == VVARARG) {
SETARG_C(getinstruction(fs, e), 2);
e->k = VRELOC; /* can relocate its simple result */
}
}
/*
** Ensure that expression 'e' is not a variable (nor a constant).
** (Expression still may have jump lists.)
*/
void luaK_dischargevars (FuncState *fs, expdesc *e) {
switch (e->k) {
case VCONST: {
const2exp(const2val(fs, e), e);
break;
}
case VLOCAL: { /* already in a register */
e->u.info = e->u.var.sidx;
e->k = VNONRELOC; /* becomes a non-relocatable value */
break;
}
case VUPVAL: { /* move value to some (pending) register */
e->u.info = luaK_codeABC(fs, OP_GETUPVAL, 0, e->u.info, 0);
e->k = VRELOC;
break;
}
case VINDEXUP: {
e->u.info = luaK_codeABC(fs, OP_GETTABUP, 0, e->u.ind.t, e->u.ind.idx);
e->k = VRELOC;
break;
}
case VINDEXI: {
freereg(fs, e->u.ind.t);
e->u.info = luaK_codeABC(fs, OP_GETI, 0, e->u.ind.t, e->u.ind.idx);
e->k = VRELOC;
break;
}
case VINDEXSTR: {
freereg(fs, e->u.ind.t);
e->u.info = luaK_codeABC(fs, OP_GETFIELD, 0, e->u.ind.t, e->u.ind.idx);
e->k = VRELOC;
break;
}
case VINDEXED: {
freeregs(fs, e->u.ind.t, e->u.ind.idx);
e->u.info = luaK_codeABC(fs, OP_GETTABLE, 0, e->u.ind.t, e->u.ind.idx);
e->k = VRELOC;
break;
}
case VVARARG: case VCALL: {
luaK_setoneret(fs, e);
break;
}
default: break; /* there is one value available (somewhere) */
}
}
/*
** Ensures expression value is in register 'reg' (and therefore
** 'e' will become a non-relocatable expression).
** (Expression still may have jump lists.)
*/
static void discharge2reg (FuncState *fs, expdesc *e, int reg) {
luaK_dischargevars(fs, e);
switch (e->k) {
case VNIL: {
luaK_nil(fs, reg, 1);
break;
}
case VFALSE: {
luaK_codeABC(fs, OP_LOADFALSE, reg, 0, 0);
break;
}
case VTRUE: {
luaK_codeABC(fs, OP_LOADTRUE, reg, 0, 0);
break;
}
case VKSTR: {
str2K(fs, e);
} /* FALLTHROUGH */
case VK: {
luaK_codek(fs, reg, e->u.info);
break;
}
case VKFLT: {
luaK_float(fs, reg, e->u.nval);
break;
}
case VKINT: {
luaK_int(fs, reg, e->u.ival);
break;
}
case VRELOC: {
Instruction *pc = &getinstruction(fs, e);
SETARG_A(*pc, reg); /* instruction will put result in 'reg' */
break;
}
case VNONRELOC: {
if (reg != e->u.info)
luaK_codeABC(fs, OP_MOVE, reg, e->u.info, 0);
break;
}
default: {
lua_assert(e->k == VJMP);
return; /* nothing to do... */
}
}
e->u.info = reg;
e->k = VNONRELOC;
}
/*
** Ensures expression value is in any register.
** (Expression still may have jump lists.)
*/
static void discharge2anyreg (FuncState *fs, expdesc *e) {
if (e->k != VNONRELOC) { /* no fixed register yet? */
luaK_reserveregs(fs, 1); /* get a register */
discharge2reg(fs, e, fs->freereg-1); /* put value there */
}
}
static int code_loadbool (FuncState *fs, int A, OpCode op) {
luaK_getlabel(fs); /* those instructions may be jump targets */
return luaK_codeABC(fs, op, A, 0, 0);
}
/*
** check whether list has any jump that do not produce a value
** or produce an inverted value
*/
static int need_value (FuncState *fs, int list) {
for (; list != NO_JUMP; list = getjump(fs, list)) {
Instruction i = *getjumpcontrol(fs, list);
if (GET_OPCODE(i) != OP_TESTSET) return 1;
}
return 0; /* not found */
}
/*
** Ensures final expression result (which includes results from its
** jump lists) is in register 'reg'.
** If expression has jumps, need to patch these jumps either to
** its final position or to "load" instructions (for those tests
** that do not produce values).
*/
static void exp2reg (FuncState *fs, expdesc *e, int reg) {
discharge2reg(fs, e, reg);
if (e->k == VJMP) /* expression itself is a test? */
luaK_concat(fs, &e->t, e->u.info); /* put this jump in 't' list */
if (hasjumps(e)) {
int final; /* position after whole expression */
int p_f = NO_JUMP; /* position of an eventual LOAD false */
int p_t = NO_JUMP; /* position of an eventual LOAD true */
if (need_value(fs, e->t) || need_value(fs, e->f)) {
int fj = (e->k == VJMP) ? NO_JUMP : luaK_jump(fs);
p_f = code_loadbool(fs, reg, OP_LFALSESKIP); /* skip next inst. */
p_t = code_loadbool(fs, reg, OP_LOADTRUE);
/* jump around these booleans if 'e' is not a test */
luaK_patchtohere(fs, fj);
}
final = luaK_getlabel(fs);
patchlistaux(fs, e->f, final, reg, p_f);
patchlistaux(fs, e->t, final, reg, p_t);
}
e->f = e->t = NO_JUMP;
e->u.info = reg;
e->k = VNONRELOC;
}
/*
** Ensures final expression result is in next available register.
*/
void luaK_exp2nextreg (FuncState *fs, expdesc *e) {
luaK_dischargevars(fs, e);
freeexp(fs, e);
luaK_reserveregs(fs, 1);
exp2reg(fs, e, fs->freereg - 1);
}
/*
** Ensures final expression result is in some (any) register
** and return that register.
*/
int luaK_exp2anyreg (FuncState *fs, expdesc *e) {
luaK_dischargevars(fs, e);
if (e->k == VNONRELOC) { /* expression already has a register? */
if (!hasjumps(e)) /* no jumps? */
return e->u.info; /* result is already in a register */
if (e->u.info >= luaY_nvarstack(fs)) { /* reg. is not a local? */
exp2reg(fs, e, e->u.info); /* put final result in it */
return e->u.info;
}
}
luaK_exp2nextreg(fs, e); /* otherwise, use next available register */
return e->u.info;
}
/*
** Ensures final expression result is either in a register
** or in an upvalue.
*/
void luaK_exp2anyregup (FuncState *fs, expdesc *e) {
if (e->k != VUPVAL || hasjumps(e))
luaK_exp2anyreg(fs, e);
}
/*
** Ensures final expression result is either in a register
** or it is a constant.
*/
void luaK_exp2val (FuncState *fs, expdesc *e) {
if (hasjumps(e))
luaK_exp2anyreg(fs, e);
else
luaK_dischargevars(fs, e);
}
/*
** Try to make 'e' a K expression with an index in the range of R/K
** indices. Return true iff succeeded.
*/
static int luaK_exp2K (FuncState *fs, expdesc *e) {
if (!hasjumps(e)) {
int info;
switch (e->k) { /* move constants to 'k' */
case VTRUE: info = boolT(fs); break;
case VFALSE: info = boolF(fs); break;
case VNIL: info = nilK(fs); break;
case VKINT: info = luaK_intK(fs, e->u.ival); break;
case VKFLT: info = luaK_numberK(fs, e->u.nval); break;
case VKSTR: info = stringK(fs, e->u.strval); break;
case VK: info = e->u.info; break;
default: return 0; /* not a constant */
}
if (info <= MAXINDEXRK) { /* does constant fit in 'argC'? */
e->k = VK; /* make expression a 'K' expression */
e->u.info = info;
return 1;
}
}
/* else, expression doesn't fit; leave it unchanged */
return 0;
}
/*
** Ensures final expression result is in a valid R/K index
** (that is, it is either in a register or in 'k' with an index
** in the range of R/K indices).
** Returns 1 iff expression is K.
*/
int luaK_exp2RK (FuncState *fs, expdesc *e) {
if (luaK_exp2K(fs, e))
return 1;
else { /* not a constant in the right range: put it in a register */
luaK_exp2anyreg(fs, e);
return 0;
}
}
static void codeABRK (FuncState *fs, OpCode o, int a, int b,
expdesc *ec) {
int k = luaK_exp2RK(fs, ec);
luaK_codeABCk(fs, o, a, b, ec->u.info, k);
}
/*
** Generate code to store result of expression 'ex' into variable 'var'.
*/
void luaK_storevar (FuncState *fs, expdesc *var, expdesc *ex) {
switch (var->k) {
case VLOCAL: {
freeexp(fs, ex);
exp2reg(fs, ex, var->u.var.sidx); /* compute 'ex' into proper place */
return;
}
case VUPVAL: {
int e = luaK_exp2anyreg(fs, ex);
luaK_codeABC(fs, OP_SETUPVAL, e, var->u.info, 0);
break;
}
case VINDEXUP: {
codeABRK(fs, OP_SETTABUP, var->u.ind.t, var->u.ind.idx, ex);
break;
}
case VINDEXI: {
codeABRK(fs, OP_SETI, var->u.ind.t, var->u.ind.idx, ex);
break;
}
case VINDEXSTR: {
codeABRK(fs, OP_SETFIELD, var->u.ind.t, var->u.ind.idx, ex);
break;
}
case VINDEXED: {
codeABRK(fs, OP_SETTABLE, var->u.ind.t, var->u.ind.idx, ex);
break;
}
default: lua_assert(0); /* invalid var kind to store */
}
freeexp(fs, ex);
}
/*
** Emit SELF instruction (convert expression 'e' into 'e:key(e,').
*/
void luaK_self (FuncState *fs, expdesc *e, expdesc *key) {
int ereg;
luaK_exp2anyreg(fs, e);
ereg = e->u.info; /* register where 'e' was placed */
freeexp(fs, e);
e->u.info = fs->freereg; /* base register for op_self */
e->k = VNONRELOC; /* self expression has a fixed register */
luaK_reserveregs(fs, 2); /* function and 'self' produced by op_self */
codeABRK(fs, OP_SELF, e->u.info, ereg, key);
freeexp(fs, key);
}
/*
** Negate condition 'e' (where 'e' is a comparison).
*/
static void negatecondition (FuncState *fs, expdesc *e) {
Instruction *pc = getjumpcontrol(fs, e->u.info);
lua_assert(testTMode(GET_OPCODE(*pc)) && GET_OPCODE(*pc) != OP_TESTSET &&
GET_OPCODE(*pc) != OP_TEST);
SETARG_k(*pc, (GETARG_k(*pc) ^ 1));
}
/*
** Emit instruction to jump if 'e' is 'cond' (that is, if 'cond'
** is true, code will jump if 'e' is true.) Return jump position.
** Optimize when 'e' is 'not' something, inverting the condition
** and removing the 'not'.
*/
static int jumponcond (FuncState *fs, expdesc *e, int cond) {
if (e->k == VRELOC) {
Instruction ie = getinstruction(fs, e);
if (GET_OPCODE(ie) == OP_NOT) {
removelastinstruction(fs); /* remove previous OP_NOT */
return condjump(fs, OP_TEST, GETARG_B(ie), 0, 0, !cond);
}
/* else go through */
}
discharge2anyreg(fs, e);
freeexp(fs, e);
return condjump(fs, OP_TESTSET, NO_REG, e->u.info, 0, cond);
}
/*
** Emit code to go through if 'e' is true, jump otherwise.
*/
void luaK_goiftrue (FuncState *fs, expdesc *e) {
int pc; /* pc of new jump */
luaK_dischargevars(fs, e);
switch (e->k) {
case VJMP: { /* condition? */
negatecondition(fs, e); /* jump when it is false */
pc = e->u.info; /* save jump position */
break;
}
case VK: case VKFLT: case VKINT: case VKSTR: case VTRUE: {
pc = NO_JUMP; /* always true; do nothing */
break;
}
default: {
pc = jumponcond(fs, e, 0); /* jump when false */
break;
}
}
luaK_concat(fs, &e->f, pc); /* insert new jump in false list */
luaK_patchtohere(fs, e->t); /* true list jumps to here (to go through) */
e->t = NO_JUMP;
}
/*
** Emit code to go through if 'e' is false, jump otherwise.
*/
void luaK_goiffalse (FuncState *fs, expdesc *e) {
int pc; /* pc of new jump */
luaK_dischargevars(fs, e);
switch (e->k) {
case VJMP: {
pc = e->u.info; /* already jump if true */
break;
}
case VNIL: case VFALSE: {
pc = NO_JUMP; /* always false; do nothing */
break;
}
default: {
pc = jumponcond(fs, e, 1); /* jump if true */
break;
}
}
luaK_concat(fs, &e->t, pc); /* insert new jump in 't' list */
luaK_patchtohere(fs, e->f); /* false list jumps to here (to go through) */
e->f = NO_JUMP;
}
/*
** Code 'not e', doing constant folding.
*/
static void codenot (FuncState *fs, expdesc *e) {
switch (e->k) {
case VNIL: case VFALSE: {
e->k = VTRUE; /* true == not nil == not false */
break;
}
case VK: case VKFLT: case VKINT: case VKSTR: case VTRUE: {
e->k = VFALSE; /* false == not "x" == not 0.5 == not 1 == not true */
break;
}
case VJMP: {
negatecondition(fs, e);
break;
}
case VRELOC:
case VNONRELOC: {
discharge2anyreg(fs, e);
freeexp(fs, e);
e->u.info = luaK_codeABC(fs, OP_NOT, 0, e->u.info, 0);
e->k = VRELOC;
break;
}
default: lua_assert(0); /* cannot happen */
}
/* interchange true and false lists */
{ int temp = e->f; e->f = e->t; e->t = temp; }
removevalues(fs, e->f); /* values are useless when negated */
removevalues(fs, e->t);
}
/*
** Check whether expression 'e' is a small literal string
*/
static int isKstr (FuncState *fs, expdesc *e) {
return (e->k == VK && !hasjumps(e) && e->u.info <= MAXARG_B &&
ttisshrstring(&fs->f->k[e->u.info]));
}
/*
** Check whether expression 'e' is a literal integer.
*/
int luaK_isKint (expdesc *e) {
return (e->k == VKINT && !hasjumps(e));
}
/*
** Check whether expression 'e' is a literal integer in
** proper range to fit in register C
*/
static int isCint (expdesc *e) {
return luaK_isKint(e) && (l_castS2U(e->u.ival) <= l_castS2U(MAXARG_C));
}
/*
** Check whether expression 'e' is a literal integer in
** proper range to fit in register sC
*/
static int isSCint (expdesc *e) {
return luaK_isKint(e) && fitsC(e->u.ival);
}
/*
** Check whether expression 'e' is a literal integer or float in
** proper range to fit in a register (sB or sC).
*/
static int isSCnumber (expdesc *e, int *pi, int *isfloat) {
lua_Integer i;
if (e->k == VKINT)
i = e->u.ival;
else if (e->k == VKFLT && luaV_flttointeger(e->u.nval, &i, F2Ieq))
*isfloat = 1;
else
return 0; /* not a number */
if (!hasjumps(e) && fitsC(i)) {
*pi = int2sC(cast_int(i));
return 1;
}
else
return 0;
}
/*
** Create expression 't[k]'. 't' must have its final result already in a
** register or upvalue. Upvalues can only be indexed by literal strings.
** Keys can be literal strings in the constant table or arbitrary
** values in registers.
*/
void luaK_indexed (FuncState *fs, expdesc *t, expdesc *k) {
if (k->k == VKSTR)
str2K(fs, k);
lua_assert(!hasjumps(t) &&
(t->k == VLOCAL || t->k == VNONRELOC || t->k == VUPVAL));
if (t->k == VUPVAL && !isKstr(fs, k)) /* upvalue indexed by non 'Kstr'? */
luaK_exp2anyreg(fs, t); /* put it in a register */
if (t->k == VUPVAL) {
t->u.ind.t = t->u.info; /* upvalue index */
t->u.ind.idx = k->u.info; /* literal string */
t->k = VINDEXUP;
}
else {
/* register index of the table */
t->u.ind.t = (t->k == VLOCAL) ? t->u.var.sidx: t->u.info;
if (isKstr(fs, k)) {
t->u.ind.idx = k->u.info; /* literal string */
t->k = VINDEXSTR;
}
else if (isCint(k)) {
t->u.ind.idx = cast_int(k->u.ival); /* int. constant in proper range */
t->k = VINDEXI;
}
else {
t->u.ind.idx = luaK_exp2anyreg(fs, k); /* register */
t->k = VINDEXED;
}
}
}
/*
** Return false if folding can raise an error.
** Bitwise operations need operands convertible to integers; division
** operations cannot have 0 as divisor.
*/
static int validop (int op, TValue *v1, TValue *v2) {
switch (op) {
case LUA_OPBAND: case LUA_OPBOR: case LUA_OPBXOR:
case LUA_OPSHL: case LUA_OPSHR: case LUA_OPBNOT: { /* conversion errors */
lua_Integer i;
return (tointegerns(v1, &i) && tointegerns(v2, &i));
}
case LUA_OPDIV: case LUA_OPIDIV: case LUA_OPMOD: /* division by 0 */
return (nvalue(v2) != 0);
default: return 1; /* everything else is valid */
}
}
/*
** Try to "constant-fold" an operation; return 1 iff successful.
** (In this case, 'e1' has the final result.)
*/
static int constfolding (FuncState *fs, int op, expdesc *e1,
const expdesc *e2) {
TValue v1, v2, res;
if (!tonumeral(e1, &v1) || !tonumeral(e2, &v2) || !validop(op, &v1, &v2))
return 0; /* non-numeric operands or not safe to fold */
luaO_rawarith(fs->ls->L, op, &v1, &v2, &res); /* does operation */
if (ttisinteger(&res)) {
e1->k = VKINT;
e1->u.ival = ivalue(&res);
}
else { /* folds neither NaN nor 0.0 (to avoid problems with -0.0) */
lua_Number n = fltvalue(&res);
if (luai_numisnan(n) || n == 0)
return 0;
e1->k = VKFLT;
e1->u.nval = n;
}
return 1;
}
/*
** Emit code for unary expressions that "produce values"
** (everything but 'not').
** Expression to produce final result will be encoded in 'e'.
*/
static void codeunexpval (FuncState *fs, OpCode op, expdesc *e, int line) {
int r = luaK_exp2anyreg(fs, e); /* opcodes operate only on registers */
freeexp(fs, e);
e->u.info = luaK_codeABC(fs, op, 0, r, 0); /* generate opcode */
e->k = VRELOC; /* all those operations are relocatable */
luaK_fixline(fs, line);
}
/*
** Emit code for binary expressions that "produce values"
** (everything but logical operators 'and'/'or' and comparison
** operators).
** Expression to produce final result will be encoded in 'e1'.
*/
static void finishbinexpval (FuncState *fs, expdesc *e1, expdesc *e2,
OpCode op, int v2, int flip, int line,
OpCode mmop, TMS event) {
int v1 = luaK_exp2anyreg(fs, e1);
int pc = luaK_codeABCk(fs, op, 0, v1, v2, 0);
freeexps(fs, e1, e2);
e1->u.info = pc;
e1->k = VRELOC; /* all those operations are relocatable */
luaK_fixline(fs, line);
luaK_codeABCk(fs, mmop, v1, v2, event, flip); /* to call metamethod */
luaK_fixline(fs, line);
}
/*
** Emit code for binary expressions that "produce values" over
** two registers.
*/
static void codebinexpval (FuncState *fs, OpCode op,
expdesc *e1, expdesc *e2, int line) {
int v2 = luaK_exp2anyreg(fs, e2); /* both operands are in registers */
lua_assert(OP_ADD <= op && op <= OP_SHR);
finishbinexpval(fs, e1, e2, op, v2, 0, line, OP_MMBIN,
cast(TMS, (op - OP_ADD) + TM_ADD));
}
/*
** Code binary operators with immediate operands.
*/
static void codebini (FuncState *fs, OpCode op,
expdesc *e1, expdesc *e2, int flip, int line,
TMS event) {
int v2 = int2sC(cast_int(e2->u.ival)); /* immediate operand */
lua_assert(e2->k == VKINT);
finishbinexpval(fs, e1, e2, op, v2, flip, line, OP_MMBINI, event);
}
/* Try to code a binary operator negating its second operand.
** For the metamethod, 2nd operand must keep its original value.
*/
static int finishbinexpneg (FuncState *fs, expdesc *e1, expdesc *e2,
OpCode op, int line, TMS event) {
if (!luaK_isKint(e2))
return 0; /* not an integer constant */
else {
lua_Integer i2 = e2->u.ival;
if (!(fitsC(i2) && fitsC(-i2)))
return 0; /* not in the proper range */
else { /* operating a small integer constant */
int v2 = cast_int(i2);
finishbinexpval(fs, e1, e2, op, int2sC(-v2), 0, line, OP_MMBINI, event);
/* correct metamethod argument */
SETARG_B(fs->f->code[fs->pc - 1], int2sC(v2));
return 1; /* successfully coded */
}
}
}
static void swapexps (expdesc *e1, expdesc *e2) {
expdesc temp = *e1; *e1 = *e2; *e2 = temp; /* swap 'e1' and 'e2' */
}
/*
** Code arithmetic operators ('+', '-', ...). If second operand is a
** constant in the proper range, use variant opcodes with K operands.
*/
static void codearith (FuncState *fs, BinOpr opr,
expdesc *e1, expdesc *e2, int flip, int line) {
TMS event = cast(TMS, opr + TM_ADD);
if (tonumeral(e2, NULL) && luaK_exp2K(fs, e2)) { /* K operand? */
int v2 = e2->u.info; /* K index */
OpCode op = cast(OpCode, opr + OP_ADDK);
finishbinexpval(fs, e1, e2, op, v2, flip, line, OP_MMBINK, event);
}
else { /* 'e2' is neither an immediate nor a K operand */
OpCode op = cast(OpCode, opr + OP_ADD);
if (flip)
swapexps(e1, e2); /* back to original order */
codebinexpval(fs, op, e1, e2, line); /* use standard operators */
}
}
/*
** Code commutative operators ('+', '*'). If first operand is a
** numeric constant, change order of operands to try to use an
** immediate or K operator.
*/
static void codecommutative (FuncState *fs, BinOpr op,
expdesc *e1, expdesc *e2, int line) {
int flip = 0;
if (tonumeral(e1, NULL)) { /* is first operand a numeric constant? */
swapexps(e1, e2); /* change order */
flip = 1;
}
if (op == OPR_ADD && isSCint(e2)) /* immediate operand? */
codebini(fs, cast(OpCode, OP_ADDI), e1, e2, flip, line, TM_ADD);
else
codearith(fs, op, e1, e2, flip, line);
}
/*
** Code bitwise operations; they are all associative, so the function
** tries to put an integer constant as the 2nd operand (a K operand).
*/
static void codebitwise (FuncState *fs, BinOpr opr,
expdesc *e1, expdesc *e2, int line) {
int flip = 0;
int v2;
OpCode op;
if (e1->k == VKINT && luaK_exp2RK(fs, e1)) {
swapexps(e1, e2); /* 'e2' will be the constant operand */
flip = 1;
}
else if (!(e2->k == VKINT && luaK_exp2RK(fs, e2))) { /* no constants? */
op = cast(OpCode, opr + OP_ADD);
codebinexpval(fs, op, e1, e2, line); /* all-register opcodes */
return;
}
v2 = e2->u.info; /* index in K array */
op = cast(OpCode, opr + OP_ADDK);
lua_assert(ttisinteger(&fs->f->k[v2]));
finishbinexpval(fs, e1, e2, op, v2, flip, line, OP_MMBINK,
cast(TMS, opr + TM_ADD));
}
/*
** Emit code for order comparisons. When using an immediate operand,
** 'isfloat' tells whether the original value was a float.
*/
static void codeorder (FuncState *fs, OpCode op, expdesc *e1, expdesc *e2) {
int r1, r2;
int im;
int isfloat = 0;
if (isSCnumber(e2, &im, &isfloat)) {
/* use immediate operand */
r1 = luaK_exp2anyreg(fs, e1);
r2 = im;
op = cast(OpCode, (op - OP_LT) + OP_LTI);
}
else if (isSCnumber(e1, &im, &isfloat)) {
/* transform (A < B) to (B > A) and (A <= B) to (B >= A) */
r1 = luaK_exp2anyreg(fs, e2);
r2 = im;
op = (op == OP_LT) ? OP_GTI : OP_GEI;
}
else { /* regular case, compare two registers */
r1 = luaK_exp2anyreg(fs, e1);
r2 = luaK_exp2anyreg(fs, e2);
}
freeexps(fs, e1, e2);
e1->u.info = condjump(fs, op, r1, r2, isfloat, 1);
e1->k = VJMP;
}
/*
** Emit code for equality comparisons ('==', '~=').
** 'e1' was already put as RK by 'luaK_infix'.
*/
static void codeeq (FuncState *fs, BinOpr opr, expdesc *e1, expdesc *e2) {
int r1, r2;
int im;
int isfloat = 0; /* not needed here, but kept for symmetry */
OpCode op;
if (e1->k != VNONRELOC) {
lua_assert(e1->k == VK || e1->k == VKINT || e1->k == VKFLT);
swapexps(e1, e2);
}
r1 = luaK_exp2anyreg(fs, e1); /* 1st expression must be in register */
if (isSCnumber(e2, &im, &isfloat)) {
op = OP_EQI;
r2 = im; /* immediate operand */
}
else if (luaK_exp2RK(fs, e2)) { /* 1st expression is constant? */
op = OP_EQK;
r2 = e2->u.info; /* constant index */
}
else {
op = OP_EQ; /* will compare two registers */
r2 = luaK_exp2anyreg(fs, e2);
}
freeexps(fs, e1, e2);
e1->u.info = condjump(fs, op, r1, r2, isfloat, (opr == OPR_EQ));
e1->k = VJMP;
}
/*
** Apply prefix operation 'op' to expression 'e'.
*/
void luaK_prefix (FuncState *fs, UnOpr op, expdesc *e, int line) {
static const expdesc ef = {VKINT, {0}, NO_JUMP, NO_JUMP};
luaK_dischargevars(fs, e);
switch (op) {
case OPR_MINUS: case OPR_BNOT: /* use 'ef' as fake 2nd operand */
if (constfolding(fs, op + LUA_OPUNM, e, &ef))
break;
/* else */ /* FALLTHROUGH */
case OPR_LEN:
codeunexpval(fs, cast(OpCode, op + OP_UNM), e, line);
break;
case OPR_NOT: codenot(fs, e); break;
default: lua_assert(0);
}
}
/*
** Process 1st operand 'v' of binary operation 'op' before reading
** 2nd operand.
*/
void luaK_infix (FuncState *fs, BinOpr op, expdesc *v) {
luaK_dischargevars(fs, v);
switch (op) {
case OPR_AND: {
luaK_goiftrue(fs, v); /* go ahead only if 'v' is true */
break;
}
case OPR_OR: {
luaK_goiffalse(fs, v); /* go ahead only if 'v' is false */
break;
}
case OPR_CONCAT: {
luaK_exp2nextreg(fs, v); /* operand must be on the stack */
break;
}
case OPR_ADD: case OPR_SUB:
case OPR_MUL: case OPR_DIV: case OPR_IDIV:
case OPR_MOD: case OPR_POW:
case OPR_BAND: case OPR_BOR: case OPR_BXOR:
case OPR_SHL: case OPR_SHR: {
if (!tonumeral(v, NULL))
luaK_exp2anyreg(fs, v);
/* else keep numeral, which may be folded with 2nd operand */
break;
}
case OPR_EQ: case OPR_NE: {
if (!tonumeral(v, NULL))
luaK_exp2RK(fs, v);
/* else keep numeral, which may be an immediate operand */
break;
}
case OPR_LT: case OPR_LE:
case OPR_GT: case OPR_GE: {
int dummy, dummy2;
if (!isSCnumber(v, &dummy, &dummy2))
luaK_exp2anyreg(fs, v);
/* else keep numeral, which may be an immediate operand */
break;
}
default: lua_assert(0);
}
}
/*
** Create code for '(e1 .. e2)'.
** For '(e1 .. e2.1 .. e2.2)' (which is '(e1 .. (e2.1 .. e2.2))',
** because concatenation is right associative), merge both CONCATs.
*/
static void codeconcat (FuncState *fs, expdesc *e1, expdesc *e2, int line) {
Instruction *ie2 = previousinstruction(fs);
if (GET_OPCODE(*ie2) == OP_CONCAT) { /* is 'e2' a concatenation? */
int n = GETARG_B(*ie2); /* # of elements concatenated in 'e2' */
lua_assert(e1->u.info + 1 == GETARG_A(*ie2));
freeexp(fs, e2);
SETARG_A(*ie2, e1->u.info); /* correct first element ('e1') */
SETARG_B(*ie2, n + 1); /* will concatenate one more element */
}
else { /* 'e2' is not a concatenation */
luaK_codeABC(fs, OP_CONCAT, e1->u.info, 2, 0); /* new concat opcode */
freeexp(fs, e2);
luaK_fixline(fs, line);
}
}
/*
** Finalize code for binary operation, after reading 2nd operand.
*/
void luaK_posfix (FuncState *fs, BinOpr opr,
expdesc *e1, expdesc *e2, int line) {
luaK_dischargevars(fs, e2);
if (foldbinop(opr) && constfolding(fs, opr + LUA_OPADD, e1, e2))
return; /* done by folding */
switch (opr) {
case OPR_AND: {
lua_assert(e1->t == NO_JUMP); /* list closed by 'luaK_infix' */
luaK_concat(fs, &e2->f, e1->f);
*e1 = *e2;
break;
}
case OPR_OR: {
lua_assert(e1->f == NO_JUMP); /* list closed by 'luaK_infix' */
luaK_concat(fs, &e2->t, e1->t);
*e1 = *e2;
break;
}
case OPR_CONCAT: { /* e1 .. e2 */
luaK_exp2nextreg(fs, e2);
codeconcat(fs, e1, e2, line);
break;
}
case OPR_ADD: case OPR_MUL: {
codecommutative(fs, opr, e1, e2, line);
break;
}
case OPR_SUB: {
if (finishbinexpneg(fs, e1, e2, OP_ADDI, line, TM_SUB))
break; /* coded as (r1 + -I) */
/* ELSE */
} /* FALLTHROUGH */
case OPR_DIV: case OPR_IDIV: case OPR_MOD: case OPR_POW: {
codearith(fs, opr, e1, e2, 0, line);
break;
}
case OPR_BAND: case OPR_BOR: case OPR_BXOR: {
codebitwise(fs, opr, e1, e2, line);
break;
}
case OPR_SHL: {
if (isSCint(e1)) {
swapexps(e1, e2);
codebini(fs, OP_SHLI, e1, e2, 1, line, TM_SHL); /* I << r2 */
}
else if (finishbinexpneg(fs, e1, e2, OP_SHRI, line, TM_SHL)) {
/* coded as (r1 >> -I) */;
}
else /* regular case (two registers) */
codebinexpval(fs, OP_SHL, e1, e2, line);
break;
}
case OPR_SHR: {
if (isSCint(e2))
codebini(fs, OP_SHRI, e1, e2, 0, line, TM_SHR); /* r1 >> I */
else /* regular case (two registers) */
codebinexpval(fs, OP_SHR, e1, e2, line);
break;
}
case OPR_EQ: case OPR_NE: {
codeeq(fs, opr, e1, e2);
break;
}
case OPR_LT: case OPR_LE: {
OpCode op = cast(OpCode, (opr - OPR_EQ) + OP_EQ);
codeorder(fs, op, e1, e2);
break;
}
case OPR_GT: case OPR_GE: {
/* '(a > b)' <=> '(b < a)'; '(a >= b)' <=> '(b <= a)' */
OpCode op = cast(OpCode, (opr - OPR_NE) + OP_EQ);
swapexps(e1, e2);
codeorder(fs, op, e1, e2);
break;
}
default: lua_assert(0);
}
}
/*
** Change line information associated with current position, by removing
** previous info and adding it again with new line.
*/
void luaK_fixline (FuncState *fs, int line) {
removelastlineinfo(fs);
savelineinfo(fs, fs->f, line);
}
void luaK_settablesize (FuncState *fs, int pc, int ra, int asize, int hsize) {
Instruction *inst = &fs->f->code[pc];
int rb = (hsize != 0) ? luaO_ceillog2(hsize) + 1 : 0; /* hash size */
int extra = asize / (MAXARG_C + 1); /* higher bits of array size */
int rc = asize % (MAXARG_C + 1); /* lower bits of array size */
int k = (extra > 0); /* true iff needs extra argument */
*inst = CREATE_ABCk(OP_NEWTABLE, ra, rb, rc, k);
*(inst + 1) = CREATE_Ax(OP_EXTRAARG, extra);
}
/*
** Emit a SETLIST instruction.
** 'base' is register that keeps table;
** 'nelems' is #table plus those to be stored now;
** 'tostore' is number of values (in registers 'base + 1',...) to add to
** table (or LUA_MULTRET to add up to stack top).
*/
void luaK_setlist (FuncState *fs, int base, int nelems, int tostore) {
lua_assert(tostore != 0 && tostore <= LFIELDS_PER_FLUSH);
if (tostore == LUA_MULTRET)
tostore = 0;
if (nelems <= MAXARG_C)
luaK_codeABC(fs, OP_SETLIST, base, tostore, nelems);
else {
int extra = nelems / (MAXARG_C + 1);
nelems %= (MAXARG_C + 1);
luaK_codeABCk(fs, OP_SETLIST, base, tostore, nelems, 1);
codeextraarg(fs, extra);
}
fs->freereg = base + 1; /* free registers with list values */
}
/*
** return the final target of a jump (skipping jumps to jumps)
*/
static int finaltarget (Instruction *code, int i) {
int count;
for (count = 0; count < 100; count++) { /* avoid infinite loops */
Instruction pc = code[i];
if (GET_OPCODE(pc) != OP_JMP)
break;
else
i += GETARG_sJ(pc) + 1;
}
return i;
}
/*
** Do a final pass over the code of a function, doing small peephole
** optimizations and adjustments.
*/
void luaK_finish (FuncState *fs) {
int i;
Proto *p = fs->f;
for (i = 0; i < fs->pc; i++) {
Instruction *pc = &p->code[i];
lua_assert(i == 0 || isOT(*(pc - 1)) == isIT(*pc));
switch (GET_OPCODE(*pc)) {
case OP_RETURN0: case OP_RETURN1: {
if (!(fs->needclose || p->is_vararg))
break; /* no extra work */
/* else use OP_RETURN to do the extra work */
SET_OPCODE(*pc, OP_RETURN);
} /* FALLTHROUGH */
case OP_RETURN: case OP_TAILCALL: {
if (fs->needclose)
SETARG_k(*pc, 1); /* signal that it needs to close */
if (p->is_vararg)
SETARG_C(*pc, p->numparams + 1); /* signal that it is vararg */
break;
}
case OP_JMP: {
int target = finaltarget(p->code, i);
fixjump(fs, i, target);
break;
}
default: break;
}
}
}
LCOROLIB¶
/*
** $Id: lcorolib.c $
** Coroutine Library
** See Copyright Notice in lua.h
*/
#define lcorolib_c
#define LUA_LIB
#include "lprefix.h"
#include <stdlib.h>
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "_native_lua_config.h" /* native Lua */
static lua_State *getco (lua_State *L) {
lua_State *co = lua_tothread(L, 1);
luaL_argexpected(L, co, 1, "thread");
return co;
}
/*
** Resumes a coroutine. Returns the number of results for non-error
** cases or -1 for errors.
*/
static int auxresume (lua_State *L, lua_State *co, int narg) {
int status, nres;
if (!lua_checkstack(co, narg)) {
lua_pushliteral(L, "too many arguments to resume");
return -1; /* error flag */
}
lua_xmove(L, co, narg);
status = lua_resume(co, L, narg, &nres);
if (status == LUA_OK || status == LUA_YIELD) {
if (!lua_checkstack(L, nres + 1)) {
lua_pop(co, nres); /* remove results anyway */
lua_pushliteral(L, "too many results to resume");
return -1; /* error flag */
}
lua_xmove(co, L, nres); /* move yielded values */
return nres;
}
else {
lua_xmove(co, L, 1); /* move error message */
return -1; /* error flag */
}
}
static int luaB_coresume (lua_State *L) {
lua_State *co = getco(L);
int r;
r = auxresume(L, co, lua_gettop(L) - 1);
if (r < 0) {
lua_pushboolean(L, 0);
lua_insert(L, -2);
return 2; /* return false + error message */
}
else {
lua_pushboolean(L, 1);
lua_insert(L, -(r + 1));
return r + 1; /* return true + 'resume' returns */
}
}
static int luaB_auxwrap (lua_State *L) {
lua_State *co = lua_tothread(L, lua_upvalueindex(1));
int r = auxresume(L, co, lua_gettop(L));
if (r < 0) {
int stat = lua_status(co);
if (stat != LUA_OK && stat != LUA_YIELD)
lua_resetthread(co); /* close variables in case of errors */
if (lua_type(L, -1) == LUA_TSTRING) { /* error object is a string? */
luaL_where(L, 1); /* add extra info, if available */
lua_insert(L, -2);
lua_concat(L, 2);
}
return lua_error(L); /* propagate error */
}
return r;
}
static int luaB_cocreate (lua_State *L) {
lua_State *NL;
luaL_checktype(L, 1, LUA_TFUNCTION);
NL = lua_newthread(L);
lua_pushvalue(L, 1); /* move function to top */
lua_xmove(L, NL, 1); /* move function from L to NL */
return 1;
}
static int luaB_cowrap (lua_State *L) {
luaB_cocreate(L);
lua_pushcclosure(L, luaB_auxwrap, 1);
return 1;
}
static int luaB_yield (lua_State *L) {
return lua_yield(L, lua_gettop(L));
}
#define COS_RUN 0
#define COS_DEAD 1
#define COS_YIELD 2
#define COS_NORM 3
static const char *const statname[] =
{"running", "dead", "suspended", "normal"};
static int auxstatus (lua_State *L, lua_State *co) {
if (L == co) return COS_RUN;
else {
switch (lua_status(co)) {
case LUA_YIELD:
return COS_YIELD;
case LUA_OK: {
lua_Debug ar;
if (lua_getstack(co, 0, &ar)) /* does it have frames? */
return COS_NORM; /* it is running */
else if (lua_gettop(co) == 0)
return COS_DEAD;
else
return COS_YIELD; /* initial state */
}
default: /* some error occurred */
return COS_DEAD;
}
}
}
static int luaB_costatus (lua_State *L) {
lua_State *co = getco(L);
lua_pushstring(L, statname[auxstatus(L, co)]);
return 1;
}
static int luaB_yieldable (lua_State *L) {
lua_State *co = lua_isnone(L, 1) ? L : getco(L);
lua_pushboolean(L, lua_isyieldable(co));
return 1;
}
static int luaB_corunning (lua_State *L) {
int ismain = lua_pushthread(L);
lua_pushboolean(L, ismain);
return 2;
}
static int luaB_close (lua_State *L) {
lua_State *co = getco(L);
int status = auxstatus(L, co);
switch (status) {
case COS_DEAD: case COS_YIELD: {
status = lua_resetthread(co);
if (status == LUA_OK) {
lua_pushboolean(L, 1);
return 1;
}
else {
lua_pushboolean(L, 0);
lua_xmove(co, L, 1); /* copy error message */
return 2;
}
}
default: /* normal or running coroutine */
return luaL_error(L, "cannot close a %s coroutine", statname[status]);
}
}
static const luaL_Reg co_funcs[] = {
{"create", luaB_cocreate},
{"resume", luaB_coresume},
{"running", luaB_corunning},
{"status", luaB_costatus},
{"wrap", luaB_cowrap},
{"yield", luaB_yield},
{"isyieldable", luaB_yieldable},
{"close", luaB_close},
{NULL, NULL}
};
LUAMOD_API int luaopen_coroutine (lua_State *L) {
luaL_newlib(L, co_funcs);
return 1;
}
LCTYPE¶
/*
** $Id: lctype.h $
** 'ctype' functions for Lua
** See Copyright Notice in lua.h
*/
#ifndef lctype_h
#define lctype_h
#include "lua.h"
#include "_native_lua_config.h" /* native Lua */
/*
** WARNING: the functions defined here do not necessarily correspond
** to the similar functions in the standard C ctype.h. They are
** optimized for the specific needs of Lua
*/
#if !defined(LUA_USE_CTYPE)
#if 'A' == 65 && '0' == 48
/* ASCII case: can use its own tables; faster and fixed */
#define LUA_USE_CTYPE 0
#else
/* must use standard C ctype */
#define LUA_USE_CTYPE 1
#endif
#endif
#if !LUA_USE_CTYPE /* { */
#include <limits.h>
#include "llimits.h"
#define ALPHABIT 0
#define DIGITBIT 1
#define PRINTBIT 2
#define SPACEBIT 3
#define XDIGITBIT 4
#define MASK(B) (1 << (B))
/*
** add 1 to char to allow index -1 (EOZ)
*/
#define testprop(c,p) (luai_ctype_[(c)+1] & (p))
/*
** 'lalpha' (Lua alphabetic) and 'lalnum' (Lua alphanumeric) both include '_'
*/
#define lislalpha(c) testprop(c, MASK(ALPHABIT))
#define lislalnum(c) testprop(c, (MASK(ALPHABIT) | MASK(DIGITBIT)))
#define lisdigit(c) testprop(c, MASK(DIGITBIT))
#define lisspace(c) testprop(c, MASK(SPACEBIT))
#define lisprint(c) testprop(c, MASK(PRINTBIT))
#define lisxdigit(c) testprop(c, MASK(XDIGITBIT))
/*
** this 'ltolower' only works for alphabetic characters
*/
#define ltolower(c) ((c) | ('A' ^ 'a'))
/* two more entries for 0 and -1 (EOZ) */
LUAI_DDEC(const lu_byte luai_ctype_[UCHAR_MAX + 2];)
#else /* }{ */
/*
** use standard C ctypes
*/
#include <ctype.h>
#define lislalpha(c) (isalpha(c) || (c) == '_')
#define lislalnum(c) (isalnum(c) || (c) == '_')
#define lisdigit(c) (isdigit(c))
#define lisspace(c) (isspace(c))
#define lisprint(c) (isprint(c))
#define lisxdigit(c) (isxdigit(c))
#define ltolower(c) (tolower(c))
#endif /* } */
#endif
/*
** $Id: lctype.c $
** 'ctype' functions for Lua
** See Copyright Notice in lua.h
*/
#define lctype_c
#define LUA_CORE
#include "lprefix.h"
#include "lctype.h"
#if !LUA_USE_CTYPE /* { */
#include <limits.h>
#if defined (LUA_UCID) /* accept UniCode IDentifiers? */
/* consider all non-ascii codepoints to be alphabetic */
#define NONA 0x01
#else
#define NONA 0x00 /* default */
#endif
LUAI_DDEF const lu_byte luai_ctype_[UCHAR_MAX + 2] = {
0x00, /* EOZ */
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0. */
0x00, 0x08, 0x08, 0x08, 0x08, 0x08, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 1. */
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x0c, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, /* 2. */
0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
0x16, 0x16, 0x16, 0x16, 0x16, 0x16, 0x16, 0x16, /* 3. */
0x16, 0x16, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
0x04, 0x15, 0x15, 0x15, 0x15, 0x15, 0x15, 0x05, /* 4. */
0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, /* 5. */
0x05, 0x05, 0x05, 0x04, 0x04, 0x04, 0x04, 0x05,
0x04, 0x15, 0x15, 0x15, 0x15, 0x15, 0x15, 0x05, /* 6. */
0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, /* 7. */
0x05, 0x05, 0x05, 0x04, 0x04, 0x04, 0x04, 0x00,
NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA, /* 8. */
NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA,
NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA, /* 9. */
NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA,
NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA, /* a. */
NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA,
NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA, /* b. */
NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA,
0x00, 0x00, NONA, NONA, NONA, NONA, NONA, NONA, /* c. */
NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA,
NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA, /* d. */
NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA,
NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA, /* e. */
NONA, NONA, NONA, NONA, NONA, NONA, NONA, NONA,
NONA, NONA, NONA, NONA, NONA, 0x00, 0x00, 0x00, /* f. */
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
#endif /* } */
LDBLIB¶
/*
** $Id: ldblib.c $
** Interface from Lua to its debug API
** See Copyright Notice in lua.h
*/
#define ldblib_c
#define LUA_LIB
#include "lprefix.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "_native_lua_config.h" /* native Lua */
/*
** The hook table at registry[HOOKKEY] maps threads to their current
** hook function.
*/
static const char *const HOOKKEY = "_HOOKKEY";
/*
** If L1 != L, L1 can be in any state, and therefore there are no
** guarantees about its stack space; any push in L1 must be
** checked.
*/
static void checkstack (lua_State *L, lua_State *L1, int n) {
if (L != L1 && !lua_checkstack(L1, n))
luaL_error(L, "stack overflow");
}
static int db_getregistry (lua_State *L) {
lua_pushvalue(L, LUA_REGISTRYINDEX);
return 1;
}
static int db_getmetatable (lua_State *L) {
luaL_checkany(L, 1);
if (!lua_getmetatable(L, 1)) {
lua_pushnil(L); /* no metatable */
}
return 1;
}
static int db_setmetatable (lua_State *L) {
int t = lua_type(L, 2);
luaL_argexpected(L, t == LUA_TNIL || t == LUA_TTABLE, 2, "nil or table");
lua_settop(L, 2);
lua_setmetatable(L, 1);
return 1; /* return 1st argument */
}
static int db_getuservalue (lua_State *L) {
int n = (int)luaL_optinteger(L, 2, 1);
if (lua_type(L, 1) != LUA_TUSERDATA)
luaL_pushfail(L);
else if (lua_getiuservalue(L, 1, n) != LUA_TNONE) {
lua_pushboolean(L, 1);
return 2;
}
return 1;
}
static int db_setuservalue (lua_State *L) {
int n = (int)luaL_optinteger(L, 3, 1);
luaL_checktype(L, 1, LUA_TUSERDATA);
luaL_checkany(L, 2);
lua_settop(L, 2);
if (!lua_setiuservalue(L, 1, n))
luaL_pushfail(L);
return 1;
}
/*
** Auxiliary function used by several library functions: check for
** an optional thread as function's first argument and set 'arg' with
** 1 if this argument is present (so that functions can skip it to
** access their other arguments)
*/
static lua_State *getthread (lua_State *L, int *arg) {
if (lua_isthread(L, 1)) {
*arg = 1;
return lua_tothread(L, 1);
}
else {
*arg = 0;
return L; /* function will operate over current thread */
}
}
/*
** Variations of 'lua_settable', used by 'db_getinfo' to put results
** from 'lua_getinfo' into result table. Key is always a string;
** value can be a string, an int, or a boolean.
*/
static void settabss (lua_State *L, const char *k, const char *v) {
lua_pushstring(L, v);
lua_setfield(L, -2, k);
}
static void settabsi (lua_State *L, const char *k, int v) {
lua_pushinteger(L, v);
lua_setfield(L, -2, k);
}
static void settabsb (lua_State *L, const char *k, int v) {
lua_pushboolean(L, v);
lua_setfield(L, -2, k);
}
/*
** In function 'db_getinfo', the call to 'lua_getinfo' may push
** results on the stack; later it creates the result table to put
** these objects. Function 'treatstackoption' puts the result from
** 'lua_getinfo' on top of the result table so that it can call
** 'lua_setfield'.
*/
static void treatstackoption (lua_State *L, lua_State *L1, const char *fname) {
if (L == L1)
lua_rotate(L, -2, 1); /* exchange object and table */
else
lua_xmove(L1, L, 1); /* move object to the "main" stack */
lua_setfield(L, -2, fname); /* put object into table */
}
/*
** Calls 'lua_getinfo' and collects all results in a new table.
** L1 needs stack space for an optional input (function) plus
** two optional outputs (function and line table) from function
** 'lua_getinfo'.
*/
static int db_getinfo (lua_State *L) {
lua_Debug ar;
int arg;
lua_State *L1 = getthread(L, &arg);
const char *options = luaL_optstring(L, arg+2, "flnSrtu");
checkstack(L, L1, 3);
if (lua_isfunction(L, arg + 1)) { /* info about a function? */
options = lua_pushfstring(L, ">%s", options); /* add '>' to 'options' */
lua_pushvalue(L, arg + 1); /* move function to 'L1' stack */
lua_xmove(L, L1, 1);
}
else { /* stack level */
if (!lua_getstack(L1, (int)luaL_checkinteger(L, arg + 1), &ar)) {
luaL_pushfail(L); /* level out of range */
return 1;
}
}
if (!lua_getinfo(L1, options, &ar))
return luaL_argerror(L, arg+2, "invalid option");
lua_newtable(L); /* table to collect results */
if (strchr(options, 'S')) {
lua_pushlstring(L, ar.source, ar.srclen);
lua_setfield(L, -2, "source");
settabss(L, "short_src", ar.short_src);
settabsi(L, "linedefined", ar.linedefined);
settabsi(L, "lastlinedefined", ar.lastlinedefined);
settabss(L, "what", ar.what);
}
if (strchr(options, 'l'))
settabsi(L, "currentline", ar.currentline);
if (strchr(options, 'u')) {
settabsi(L, "nups", ar.nups);
settabsi(L, "nparams", ar.nparams);
settabsb(L, "isvararg", ar.isvararg);
}
if (strchr(options, 'n')) {
settabss(L, "name", ar.name);
settabss(L, "namewhat", ar.namewhat);
}
if (strchr(options, 'r')) {
settabsi(L, "ftransfer", ar.ftransfer);
settabsi(L, "ntransfer", ar.ntransfer);
}
if (strchr(options, 't'))
settabsb(L, "istailcall", ar.istailcall);
if (strchr(options, 'L'))
treatstackoption(L, L1, "activelines");
if (strchr(options, 'f'))
treatstackoption(L, L1, "func");
return 1; /* return table */
}
static int db_getlocal (lua_State *L) {
int arg;
lua_State *L1 = getthread(L, &arg);
int nvar = (int)luaL_checkinteger(L, arg + 2); /* local-variable index */
if (lua_isfunction(L, arg + 1)) { /* function argument? */
lua_pushvalue(L, arg + 1); /* push function */
lua_pushstring(L, lua_getlocal(L, NULL, nvar)); /* push local name */
return 1; /* return only name (there is no value) */
}
else { /* stack-level argument */
lua_Debug ar;
const char *name;
int level = (int)luaL_checkinteger(L, arg + 1);
if (!lua_getstack(L1, level, &ar)) /* out of range? */
return luaL_argerror(L, arg+1, "level out of range");
checkstack(L, L1, 1);
name = lua_getlocal(L1, &ar, nvar);
if (name) {
lua_xmove(L1, L, 1); /* move local value */
lua_pushstring(L, name); /* push name */
lua_rotate(L, -2, 1); /* re-order */
return 2;
}
else {
luaL_pushfail(L); /* no name (nor value) */
return 1;
}
}
}
static int db_setlocal (lua_State *L) {
int arg;
const char *name;
lua_State *L1 = getthread(L, &arg);
lua_Debug ar;
int level = (int)luaL_checkinteger(L, arg + 1);
int nvar = (int)luaL_checkinteger(L, arg + 2);
if (!lua_getstack(L1, level, &ar)) /* out of range? */
return luaL_argerror(L, arg+1, "level out of range");
luaL_checkany(L, arg+3);
lua_settop(L, arg+3);
checkstack(L, L1, 1);
lua_xmove(L, L1, 1);
name = lua_setlocal(L1, &ar, nvar);
if (name == NULL)
lua_pop(L1, 1); /* pop value (if not popped by 'lua_setlocal') */
lua_pushstring(L, name);
return 1;
}
/*
** get (if 'get' is true) or set an upvalue from a closure
*/
static int auxupvalue (lua_State *L, int get) {
const char *name;
int n = (int)luaL_checkinteger(L, 2); /* upvalue index */
luaL_checktype(L, 1, LUA_TFUNCTION); /* closure */
name = get ? lua_getupvalue(L, 1, n) : lua_setupvalue(L, 1, n);
if (name == NULL) return 0;
lua_pushstring(L, name);
lua_insert(L, -(get+1)); /* no-op if get is false */
return get + 1;
}
static int db_getupvalue (lua_State *L) {
return auxupvalue(L, 1);
}
static int db_setupvalue (lua_State *L) {
luaL_checkany(L, 3);
return auxupvalue(L, 0);
}
/*
** Check whether a given upvalue from a given closure exists and
** returns its index
*/
static int checkupval (lua_State *L, int argf, int argnup) {
int nup = (int)luaL_checkinteger(L, argnup); /* upvalue index */
luaL_checktype(L, argf, LUA_TFUNCTION); /* closure */
luaL_argcheck(L, (lua_getupvalue(L, argf, nup) != NULL), argnup,
"invalid upvalue index");
return nup;
}
static int db_upvalueid (lua_State *L) {
int n = checkupval(L, 1, 2);
lua_pushlightuserdata(L, lua_upvalueid(L, 1, n));
return 1;
}
static int db_upvaluejoin (lua_State *L) {
int n1 = checkupval(L, 1, 2);
int n2 = checkupval(L, 3, 4);
luaL_argcheck(L, !lua_iscfunction(L, 1), 1, "Lua function expected");
luaL_argcheck(L, !lua_iscfunction(L, 3), 3, "Lua function expected");
lua_upvaluejoin(L, 1, n1, 3, n2);
return 0;
}
/*
** Call hook function registered at hook table for the current
** thread (if there is one)
*/
static void hookf (lua_State *L, lua_Debug *ar) {
static const char *const hooknames[] =
{"call", "return", "line", "count", "tail call"};
lua_getfield(L, LUA_REGISTRYINDEX, HOOKKEY);
lua_pushthread(L);
if (lua_rawget(L, -2) == LUA_TFUNCTION) { /* is there a hook function? */
lua_pushstring(L, hooknames[(int)ar->event]); /* push event name */
if (ar->currentline >= 0)
lua_pushinteger(L, ar->currentline); /* push current line */
else lua_pushnil(L);
lua_assert(lua_getinfo(L, "lS", ar));
lua_call(L, 2, 0); /* call hook function */
}
}
/*
** Convert a string mask (for 'sethook') into a bit mask
*/
static int makemask (const char *smask, int count) {
int mask = 0;
if (strchr(smask, 'c')) mask |= LUA_MASKCALL;
if (strchr(smask, 'r')) mask |= LUA_MASKRET;
if (strchr(smask, 'l')) mask |= LUA_MASKLINE;
if (count > 0) mask |= LUA_MASKCOUNT;
return mask;
}
/*
** Convert a bit mask (for 'gethook') into a string mask
*/
static char *unmakemask (int mask, char *smask) {
int i = 0;
if (mask & LUA_MASKCALL) smask[i++] = 'c';
if (mask & LUA_MASKRET) smask[i++] = 'r';
if (mask & LUA_MASKLINE) smask[i++] = 'l';
smask[i] = '\0';
return smask;
}
static int db_sethook (lua_State *L) {
int arg, mask, count;
lua_Hook func;
lua_State *L1 = getthread(L, &arg);
if (lua_isnoneornil(L, arg+1)) { /* no hook? */
lua_settop(L, arg+1);
func = NULL; mask = 0; count = 0; /* turn off hooks */
}
else {
const char *smask = luaL_checkstring(L, arg+2);
luaL_checktype(L, arg+1, LUA_TFUNCTION);
count = (int)luaL_optinteger(L, arg + 3, 0);
func = hookf; mask = makemask(smask, count);
}
if (!luaL_getsubtable(L, LUA_REGISTRYINDEX, HOOKKEY)) {
/* table just created; initialize it */
lua_pushstring(L, "k");
lua_setfield(L, -2, "__mode"); /** hooktable.__mode = "k" */
lua_pushvalue(L, -1);
lua_setmetatable(L, -2); /* metatable(hooktable) = hooktable */
}
checkstack(L, L1, 1);
lua_pushthread(L1); lua_xmove(L1, L, 1); /* key (thread) */
lua_pushvalue(L, arg + 1); /* value (hook function) */
lua_rawset(L, -3); /* hooktable[L1] = new Lua hook */
lua_sethook(L1, func, mask, count);
return 0;
}
static int db_gethook (lua_State *L) {
int arg;
lua_State *L1 = getthread(L, &arg);
char buff[5];
int mask = lua_gethookmask(L1);
lua_Hook hook = lua_gethook(L1);
if (hook == NULL) { /* no hook? */
luaL_pushfail(L);
return 1;
}
else if (hook != hookf) /* external hook? */
lua_pushliteral(L, "external hook");
else { /* hook table must exist */
lua_getfield(L, LUA_REGISTRYINDEX, HOOKKEY);
checkstack(L, L1, 1);
lua_pushthread(L1); lua_xmove(L1, L, 1);
lua_rawget(L, -2); /* 1st result = hooktable[L1] */
lua_remove(L, -2); /* remove hook table */
}
lua_pushstring(L, unmakemask(mask, buff)); /* 2nd result = mask */
lua_pushinteger(L, lua_gethookcount(L1)); /* 3rd result = count */
return 3;
}
static int db_debug (lua_State *L) {
for (;;) {
char buffer[250];
lua_writestringerror("%s", "lua_debug> ");
if (fgets(buffer, sizeof(buffer), stdin) == 0 ||
strcmp(buffer, "cont\n") == 0)
return 0;
if (luaL_loadbuffer(L, buffer, strlen(buffer), "=(debug command)") ||
lua_pcall(L, 0, 0, 0))
lua_writestringerror("%s\n", luaL_tolstring(L, -1, NULL));
lua_settop(L, 0); /* remove eventual returns */
}
}
static int db_traceback (lua_State *L) {
int arg;
lua_State *L1 = getthread(L, &arg);
const char *msg = lua_tostring(L, arg + 1);
if (msg == NULL && !lua_isnoneornil(L, arg + 1)) /* non-string 'msg'? */
lua_pushvalue(L, arg + 1); /* return it untouched */
else {
int level = (int)luaL_optinteger(L, arg + 2, (L == L1) ? 1 : 0);
luaL_traceback(L, L1, msg, level);
}
return 1;
}
static int db_setcstacklimit (lua_State *L) {
int limit = (int)luaL_checkinteger(L, 1);
int res = lua_setcstacklimit(L, limit);
if (res == 0)
lua_pushboolean(L, 0);
else
lua_pushinteger(L, res);
return 1;
}
static const luaL_Reg dblib[] = {
{"debug", db_debug},
{"getuservalue", db_getuservalue},
{"gethook", db_gethook},
{"getinfo", db_getinfo},
{"getlocal", db_getlocal},
{"getregistry", db_getregistry},
{"getmetatable", db_getmetatable},
{"getupvalue", db_getupvalue},
{"upvaluejoin", db_upvaluejoin},
{"upvalueid", db_upvalueid},
{"setuservalue", db_setuservalue},
{"sethook", db_sethook},
{"setlocal", db_setlocal},
{"setmetatable", db_setmetatable},
{"setupvalue", db_setupvalue},
{"traceback", db_traceback},
{"setcstacklimit", db_setcstacklimit},
{NULL, NULL}
};
LUAMOD_API int luaopen_debug (lua_State *L) {
luaL_newlib(L, dblib);
return 1;
}
LDEBUG¶
/*
** $Id: ldebug.h $
** Auxiliary functions from Debug Interface module
** See Copyright Notice in lua.h
*/
#ifndef ldebug_h
#define ldebug_h
#include "lstate.h"
#include "_native_lua_config.h" /* native Lua */
#define pcRel(pc, p) (cast_int((pc) - (p)->code) - 1)
#define resethookcount(L) (L->hookcount = L->basehookcount)
/*
** mark for entries in 'lineinfo' array that has absolute information in
** 'abslineinfo' array
*/
#define ABSLINEINFO (-0x80)
LUAI_FUNC int luaG_getfuncline (const Proto *f, int pc);
LUAI_FUNC const char *luaG_findlocal (lua_State *L, CallInfo *ci, int n,
StkId *pos);
LUAI_FUNC l_noret luaG_typeerror (lua_State *L, const TValue *o,
const char *opname);
LUAI_FUNC l_noret luaG_forerror (lua_State *L, const TValue *o,
const char *what);
LUAI_FUNC l_noret luaG_concaterror (lua_State *L, const TValue *p1,
const TValue *p2);
LUAI_FUNC l_noret luaG_opinterror (lua_State *L, const TValue *p1,
const TValue *p2,
const char *msg);
LUAI_FUNC l_noret luaG_tointerror (lua_State *L, const TValue *p1,
const TValue *p2);
LUAI_FUNC l_noret luaG_ordererror (lua_State *L, const TValue *p1,
const TValue *p2);
LUAI_FUNC l_noret luaG_runerror (lua_State *L, const char *fmt, ...);
LUAI_FUNC const char *luaG_addinfo (lua_State *L, const char *msg,
TString *src, int line);
LUAI_FUNC l_noret luaG_errormsg (lua_State *L);
LUAI_FUNC int luaG_traceexec (lua_State *L, const Instruction *pc);
#endif
/*
** $Id: ldebug.c $
** Debug Interface
** See Copyright Notice in lua.h
*/
#define ldebug_c
#define LUA_CORE
#include "lprefix.h"
#include <stdarg.h>
#include <stddef.h>
#include <string.h>
#include "lua.h"
#include "lapi.h"
#include "lcode.h"
#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "lobject.h"
#include "lopcodes.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "ltm.h"
#include "lvm.h"
#define noLuaClosure(f) ((f) == NULL || (f)->c.tt == LUA_VCCL)
/* Active Lua function (given call info) */
#define ci_func(ci) (clLvalue(s2v((ci)->func)))
static const char *funcnamefromcode (lua_State *L, CallInfo *ci,
const char **name);
static int currentpc (CallInfo *ci) {
lua_assert(isLua(ci));
return pcRel(ci->u.l.savedpc, ci_func(ci)->p);
}
/*
** Get a "base line" to find the line corresponding to an instruction.
** For that, search the array of absolute line info for the largest saved
** instruction smaller or equal to the wanted instruction. A special
** case is when there is no absolute info or the instruction is before
** the first absolute one.
*/
static int getbaseline (const Proto *f, int pc, int *basepc) {
if (f->sizeabslineinfo == 0 || pc < f->abslineinfo[0].pc) {
*basepc = -1; /* start from the beginning */
return f->linedefined;
}
else {
unsigned int i;
if (pc >= f->abslineinfo[f->sizeabslineinfo - 1].pc)
i = f->sizeabslineinfo - 1; /* instruction is after last saved one */
else { /* binary search */
unsigned int j = f->sizeabslineinfo - 1; /* pc < anchorlines[j] */
i = 0; /* abslineinfo[i] <= pc */
while (i < j - 1) {
unsigned int m = (j + i) / 2;
if (pc >= f->abslineinfo[m].pc)
i = m;
else
j = m;
}
}
*basepc = f->abslineinfo[i].pc;
return f->abslineinfo[i].line;
}
}
/*
** Get the line corresponding to instruction 'pc' in function 'f';
** first gets a base line and from there does the increments until
** the desired instruction.
*/
int luaG_getfuncline (const Proto *f, int pc) {
if (f->lineinfo == NULL) /* no debug information? */
return -1;
else {
int basepc;
int baseline = getbaseline(f, pc, &basepc);
while (basepc++ < pc) { /* walk until given instruction */
lua_assert(f->lineinfo[basepc] != ABSLINEINFO);
baseline += f->lineinfo[basepc]; /* correct line */
}
return baseline;
}
}
static int getcurrentline (CallInfo *ci) {
return luaG_getfuncline(ci_func(ci)->p, currentpc(ci));
}
/*
** Set 'trap' for all active Lua frames.
** This function can be called during a signal, under "reasonable"
** assumptions. A new 'ci' is completely linked in the list before it
** becomes part of the "active" list, and we assume that pointers are
** atomic; see comment in next function.
** (A compiler doing interprocedural optimizations could, theoretically,
** reorder memory writes in such a way that the list could be
** temporarily broken while inserting a new element. We simply assume it
** has no good reasons to do that.)
*/
static void settraps (CallInfo *ci) {
for (; ci != NULL; ci = ci->previous)
if (isLua(ci))
ci->u.l.trap = 1;
}
/*
** This function can be called during a signal, under "reasonable"
** assumptions.
** Fields 'oldpc', 'basehookcount', and 'hookcount' (set by
** 'resethookcount') are for debug only, and it is no problem if they
** get arbitrary values (causes at most one wrong hook call). 'hookmask'
** is an atomic value. We assume that pointers are atomic too (e.g., gcc
** ensures that for all platforms where it runs). Moreover, 'hook' is
** always checked before being called (see 'luaD_hook').
*/
LUA_API void lua_sethook (lua_State *L, lua_Hook func, int mask, int count) {
if (func == NULL || mask == 0) { /* turn off hooks? */
mask = 0;
func = NULL;
}
if (isLua(L->ci))
L->oldpc = L->ci->u.l.savedpc;
L->hook = func;
L->basehookcount = count;
resethookcount(L);
L->hookmask = cast_byte(mask);
if (mask)
settraps(L->ci); /* to trace inside 'luaV_execute' */
}
LUA_API lua_Hook lua_gethook (lua_State *L) {
return L->hook;
}
LUA_API int lua_gethookmask (lua_State *L) {
return L->hookmask;
}
LUA_API int lua_gethookcount (lua_State *L) {
return L->basehookcount;
}
LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar) {
int status;
CallInfo *ci;
if (level < 0) return 0; /* invalid (negative) level */
lua_lock(L);
for (ci = L->ci; level > 0 && ci != &L->base_ci; ci = ci->previous)
level--;
if (level == 0 && ci != &L->base_ci) { /* level found? */
status = 1;
ar->i_ci = ci;
}
else status = 0; /* no such level */
lua_unlock(L);
return status;
}
static const char *upvalname (const Proto *p, int uv) {
TString *s = check_exp(uv < p->sizeupvalues, p->upvalues[uv].name);
if (s == NULL) return "?";
else return getstr(s);
}
static const char *findvararg (CallInfo *ci, int n, StkId *pos) {
if (clLvalue(s2v(ci->func))->p->is_vararg) {
int nextra = ci->u.l.nextraargs;
if (n <= nextra) {
*pos = ci->func - nextra + (n - 1);
return "(vararg)"; /* generic name for any vararg */
}
}
return NULL; /* no such vararg */
}
const char *luaG_findlocal (lua_State *L, CallInfo *ci, int n, StkId *pos) {
StkId base = ci->func + 1;
const char *name = NULL;
if (isLua(ci)) {
if (n < 0) /* access to vararg values? */
return findvararg(ci, -n, pos);
else
name = luaF_getlocalname(ci_func(ci)->p, n, currentpc(ci));
}
if (name == NULL) { /* no 'standard' name? */
StkId limit = (ci == L->ci) ? L->top : ci->next->func;
if (limit - base >= n && n > 0) { /* is 'n' inside 'ci' stack? */
/* generic name for any valid slot */
name = isLua(ci) ? "(temporary)" : "(C temporary)";
}
else
return NULL; /* no name */
}
if (pos)
*pos = base + (n - 1);
return name;
}
LUA_API const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n) {
const char *name;
lua_lock(L);
if (ar == NULL) { /* information about non-active function? */
if (!isLfunction(s2v(L->top - 1))) /* not a Lua function? */
name = NULL;
else /* consider live variables at function start (parameters) */
name = luaF_getlocalname(clLvalue(s2v(L->top - 1))->p, n, 0);
}
else { /* active function; get information through 'ar' */
StkId pos = NULL; /* to avoid warnings */
name = luaG_findlocal(L, ar->i_ci, n, &pos);
if (name) {
setobjs2s(L, L->top, pos);
api_incr_top(L);
}
}
lua_unlock(L);
return name;
}
LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) {
StkId pos = NULL; /* to avoid warnings */
const char *name;
lua_lock(L);
name = luaG_findlocal(L, ar->i_ci, n, &pos);
if (name) {
setobjs2s(L, pos, L->top - 1);
L->top--; /* pop value */
}
lua_unlock(L);
return name;
}
static void funcinfo (lua_Debug *ar, Closure *cl) {
if (noLuaClosure(cl)) {
ar->source = "=[C]";
ar->srclen = LL("=[C]");
ar->linedefined = -1;
ar->lastlinedefined = -1;
ar->what = "C";
}
else {
const Proto *p = cl->l.p;
if (p->source) {
ar->source = getstr(p->source);
ar->srclen = tsslen(p->source);
}
else {
ar->source = "=?";
ar->srclen = LL("=?");
}
ar->linedefined = p->linedefined;
ar->lastlinedefined = p->lastlinedefined;
ar->what = (ar->linedefined == 0) ? "main" : "Lua";
}
luaO_chunkid(ar->short_src, ar->source, ar->srclen);
}
static int nextline (const Proto *p, int currentline, int pc) {
if (p->lineinfo[pc] != ABSLINEINFO)
return currentline + p->lineinfo[pc];
else
return luaG_getfuncline(p, pc);
}
static void collectvalidlines (lua_State *L, Closure *f) {
if (noLuaClosure(f)) {
setnilvalue(s2v(L->top));
api_incr_top(L);
}
else {
int i;
TValue v;
const Proto *p = f->l.p;
int currentline = p->linedefined;
Table *t = luaH_new(L); /* new table to store active lines */
sethvalue2s(L, L->top, t); /* push it on stack */
api_incr_top(L);
setbtvalue(&v); /* boolean 'true' to be the value of all indices */
for (i = 0; i < p->sizelineinfo; i++) { /* for all lines with code */
currentline = nextline(p, currentline, i);
luaH_setint(L, t, currentline, &v); /* table[line] = true */
}
}
}
static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name) {
if (ci == NULL) /* no 'ci'? */
return NULL; /* no info */
else if (ci->callstatus & CIST_FIN) { /* is this a finalizer? */
*name = "__gc";
return "metamethod"; /* report it as such */
}
/* calling function is a known Lua function? */
else if (!(ci->callstatus & CIST_TAIL) && isLua(ci->previous))
return funcnamefromcode(L, ci->previous, name);
else return NULL; /* no way to find a name */
}
static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar,
Closure *f, CallInfo *ci) {
int status = 1;
for (; *what; what++) {
switch (*what) {
case 'S': {
funcinfo(ar, f);
break;
}
case 'l': {
ar->currentline = (ci && isLua(ci)) ? getcurrentline(ci) : -1;
break;
}
case 'u': {
ar->nups = (f == NULL) ? 0 : f->c.nupvalues;
if (noLuaClosure(f)) {
ar->isvararg = 1;
ar->nparams = 0;
}
else {
ar->isvararg = f->l.p->is_vararg;
ar->nparams = f->l.p->numparams;
}
break;
}
case 't': {
ar->istailcall = (ci) ? ci->callstatus & CIST_TAIL : 0;
break;
}
case 'n': {
ar->namewhat = getfuncname(L, ci, &ar->name);
if (ar->namewhat == NULL) {
ar->namewhat = ""; /* not found */
ar->name = NULL;
}
break;
}
case 'r': {
if (ci == NULL || !(ci->callstatus & CIST_TRAN))
ar->ftransfer = ar->ntransfer = 0;
else {
ar->ftransfer = ci->u2.transferinfo.ftransfer;
ar->ntransfer = ci->u2.transferinfo.ntransfer;
}
break;
}
case 'L':
case 'f': /* handled by lua_getinfo */
break;
default: status = 0; /* invalid option */
}
}
return status;
}
LUA_API int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar) {
int status;
Closure *cl;
CallInfo *ci;
TValue *func;
lua_lock(L);
if (*what == '>') {
ci = NULL;
func = s2v(L->top - 1);
api_check(L, ttisfunction(func), "function expected");
what++; /* skip the '>' */
L->top--; /* pop function */
}
else {
ci = ar->i_ci;
func = s2v(ci->func);
lua_assert(ttisfunction(func));
}
cl = ttisclosure(func) ? clvalue(func) : NULL;
status = auxgetinfo(L, what, ar, cl, ci);
if (strchr(what, 'f')) {
setobj2s(L, L->top, func);
api_incr_top(L);
}
if (strchr(what, 'L'))
collectvalidlines(L, cl);
lua_unlock(L);
return status;
}
/*
** {======================================================
** Symbolic Execution
** =======================================================
*/
static const char *getobjname (const Proto *p, int lastpc, int reg,
const char **name);
/*
** Find a "name" for the constant 'c'.
*/
static void kname (const Proto *p, int c, const char **name) {
TValue *kvalue = &p->k[c];
*name = (ttisstring(kvalue)) ? svalue(kvalue) : "?";
}
/*
** Find a "name" for the register 'c'.
*/
static void rname (const Proto *p, int pc, int c, const char **name) {
const char *what = getobjname(p, pc, c, name); /* search for 'c' */
if (!(what && *what == 'c')) /* did not find a constant name? */
*name = "?";
}
/*
** Find a "name" for a 'C' value in an RK instruction.
*/
static void rkname (const Proto *p, int pc, Instruction i, const char **name) {
int c = GETARG_C(i); /* key index */
if (GETARG_k(i)) /* is 'c' a constant? */
kname(p, c, name);
else /* 'c' is a register */
rname(p, pc, c, name);
}
static int filterpc (int pc, int jmptarget) {
if (pc < jmptarget) /* is code conditional (inside a jump)? */
return -1; /* cannot know who sets that register */
else return pc; /* current position sets that register */
}
/*
** Try to find last instruction before 'lastpc' that modified register 'reg'.
*/
static int findsetreg (const Proto *p, int lastpc, int reg) {
int pc;
int setreg = -1; /* keep last instruction that changed 'reg' */
int jmptarget = 0; /* any code before this address is conditional */
if (testMMMode(GET_OPCODE(p->code[lastpc])))
lastpc--; /* previous instruction was not actually executed */
for (pc = 0; pc < lastpc; pc++) {
Instruction i = p->code[pc];
OpCode op = GET_OPCODE(i);
int a = GETARG_A(i);
int change; /* true if current instruction changed 'reg' */
switch (op) {
case OP_LOADNIL: { /* set registers from 'a' to 'a+b' */
int b = GETARG_B(i);
change = (a <= reg && reg <= a + b);
break;
}
case OP_TFORCALL: { /* affect all regs above its base */
change = (reg >= a + 2);
break;
}
case OP_CALL:
case OP_TAILCALL: { /* affect all registers above base */
change = (reg >= a);
break;
}
case OP_JMP: { /* doesn't change registers, but changes 'jmptarget' */
int b = GETARG_sJ(i);
int dest = pc + 1 + b;
/* jump does not skip 'lastpc' and is larger than current one? */
if (dest <= lastpc && dest > jmptarget)
jmptarget = dest; /* update 'jmptarget' */
change = 0;
break;
}
default: /* any instruction that sets A */
change = (testAMode(op) && reg == a);
break;
}
if (change)
setreg = filterpc(pc, jmptarget);
}
return setreg;
}
/*
** Check whether table being indexed by instruction 'i' is the
** environment '_ENV'
*/
static const char *gxf (const Proto *p, int pc, Instruction i, int isup) {
int t = GETARG_B(i); /* table index */
const char *name; /* name of indexed variable */
if (isup) /* is an upvalue? */
name = upvalname(p, t);
else
getobjname(p, pc, t, &name);
return (name && strcmp(name, LUA_ENV) == 0) ? "global" : "field";
}
static const char *getobjname (const Proto *p, int lastpc, int reg,
const char **name) {
int pc;
*name = luaF_getlocalname(p, reg + 1, lastpc);
if (*name) /* is a local? */
return "local";
/* else try symbolic execution */
pc = findsetreg(p, lastpc, reg);
if (pc != -1) { /* could find instruction? */
Instruction i = p->code[pc];
OpCode op = GET_OPCODE(i);
switch (op) {
case OP_MOVE: {
int b = GETARG_B(i); /* move from 'b' to 'a' */
if (b < GETARG_A(i))
return getobjname(p, pc, b, name); /* get name for 'b' */
break;
}
case OP_GETTABUP: {
int k = GETARG_C(i); /* key index */
kname(p, k, name);
return gxf(p, pc, i, 1);
}
case OP_GETTABLE: {
int k = GETARG_C(i); /* key index */
rname(p, pc, k, name);
return gxf(p, pc, i, 0);
}
case OP_GETI: {
*name = "integer index";
return "field";
}
case OP_GETFIELD: {
int k = GETARG_C(i); /* key index */
kname(p, k, name);
return gxf(p, pc, i, 0);
}
case OP_GETUPVAL: {
*name = upvalname(p, GETARG_B(i));
return "upvalue";
}
case OP_LOADK:
case OP_LOADKX: {
int b = (op == OP_LOADK) ? GETARG_Bx(i)
: GETARG_Ax(p->code[pc + 1]);
if (ttisstring(&p->k[b])) {
*name = svalue(&p->k[b]);
return "constant";
}
break;
}
case OP_SELF: {
rkname(p, pc, i, name);
return "method";
}
default: break; /* go through to return NULL */
}
}
return NULL; /* could not find reasonable name */
}
/*
** Try to find a name for a function based on the code that called it.
** (Only works when function was called by a Lua function.)
** Returns what the name is (e.g., "for iterator", "method",
** "metamethod") and sets '*name' to point to the name.
*/
static const char *funcnamefromcode (lua_State *L, CallInfo *ci,
const char **name) {
TMS tm = (TMS)0; /* (initial value avoids warnings) */
const Proto *p = ci_func(ci)->p; /* calling function */
int pc = currentpc(ci); /* calling instruction index */
Instruction i = p->code[pc]; /* calling instruction */
if (ci->callstatus & CIST_HOOKED) { /* was it called inside a hook? */
*name = "?";
return "hook";
}
switch (GET_OPCODE(i)) {
case OP_CALL:
case OP_TAILCALL:
return getobjname(p, pc, GETARG_A(i), name); /* get function name */
case OP_TFORCALL: { /* for iterator */
*name = "for iterator";
return "for iterator";
}
/* other instructions can do calls through metamethods */
case OP_SELF: case OP_GETTABUP: case OP_GETTABLE:
case OP_GETI: case OP_GETFIELD:
tm = TM_INDEX;
break;
case OP_SETTABUP: case OP_SETTABLE: case OP_SETI: case OP_SETFIELD:
tm = TM_NEWINDEX;
break;
case OP_MMBIN: case OP_MMBINI: case OP_MMBINK: {
tm = cast(TMS, GETARG_C(i));
break;
}
case OP_UNM: tm = TM_UNM; break;
case OP_BNOT: tm = TM_BNOT; break;
case OP_LEN: tm = TM_LEN; break;
case OP_CONCAT: tm = TM_CONCAT; break;
case OP_EQ: tm = TM_EQ; break;
case OP_LT: case OP_LE: case OP_LTI: case OP_LEI:
*name = "order"; /* '<=' can call '__lt', etc. */
return "metamethod";
case OP_CLOSE: case OP_RETURN:
*name = "close";
return "metamethod";
default:
return NULL; /* cannot find a reasonable name */
}
*name = getstr(G(L)->tmname[tm]) + 2;
return "metamethod";
}
/* }====================================================== */
/*
** The subtraction of two potentially unrelated pointers is
** not ISO C, but it should not crash a program; the subsequent
** checks are ISO C and ensure a correct result.
*/
static int isinstack (CallInfo *ci, const TValue *o) {
StkId base = ci->func + 1;
ptrdiff_t i = cast(StkId, o) - base;
return (0 <= i && i < (ci->top - base) && s2v(base + i) == o);
}
/*
** Checks whether value 'o' came from an upvalue. (That can only happen
** with instructions OP_GETTABUP/OP_SETTABUP, which operate directly on
** upvalues.)
*/
static const char *getupvalname (CallInfo *ci, const TValue *o,
const char **name) {
LClosure *c = ci_func(ci);
int i;
for (i = 0; i < c->nupvalues; i++) {
if (c->upvals[i]->v == o) {
*name = upvalname(c->p, i);
return "upvalue";
}
}
return NULL;
}
static const char *varinfo (lua_State *L, const TValue *o) {
const char *name = NULL; /* to avoid warnings */
CallInfo *ci = L->ci;
const char *kind = NULL;
if (isLua(ci)) {
kind = getupvalname(ci, o, &name); /* check whether 'o' is an upvalue */
if (!kind && isinstack(ci, o)) /* no? try a register */
kind = getobjname(ci_func(ci)->p, currentpc(ci),
cast_int(cast(StkId, o) - (ci->func + 1)), &name);
}
return (kind) ? luaO_pushfstring(L, " (%s '%s')", kind, name) : "";
}
l_noret luaG_typeerror (lua_State *L, const TValue *o, const char *op) {
const char *t = luaT_objtypename(L, o);
luaG_runerror(L, "attempt to %s a %s value%s", op, t, varinfo(L, o));
}
l_noret luaG_forerror (lua_State *L, const TValue *o, const char *what) {
luaG_runerror(L, "bad 'for' %s (number expected, got %s)",
what, luaT_objtypename(L, o));
}
l_noret luaG_concaterror (lua_State *L, const TValue *p1, const TValue *p2) {
if (ttisstring(p1) || cvt2str(p1)) p1 = p2;
luaG_typeerror(L, p1, "concatenate");
}
l_noret luaG_opinterror (lua_State *L, const TValue *p1,
const TValue *p2, const char *msg) {
if (!ttisnumber(p1)) /* first operand is wrong? */
p2 = p1; /* now second is wrong */
luaG_typeerror(L, p2, msg);
}
/*
** Error when both values are convertible to numbers, but not to integers
*/
l_noret luaG_tointerror (lua_State *L, const TValue *p1, const TValue *p2) {
lua_Integer temp;
if (!tointegerns(p1, &temp))
p2 = p1;
luaG_runerror(L, "number%s has no integer representation", varinfo(L, p2));
}
l_noret luaG_ordererror (lua_State *L, const TValue *p1, const TValue *p2) {
const char *t1 = luaT_objtypename(L, p1);
const char *t2 = luaT_objtypename(L, p2);
if (strcmp(t1, t2) == 0)
luaG_runerror(L, "attempt to compare two %s values", t1);
else
luaG_runerror(L, "attempt to compare %s with %s", t1, t2);
}
/* add src:line information to 'msg' */
const char *luaG_addinfo (lua_State *L, const char *msg, TString *src,
int line) {
char buff[LUA_IDSIZE];
if (src)
luaO_chunkid(buff, getstr(src), tsslen(src));
else { /* no source available; use "?" instead */
buff[0] = '?'; buff[1] = '\0';
}
return luaO_pushfstring(L, "%s:%d: %s", buff, line, msg);
}
l_noret luaG_errormsg (lua_State *L) {
if (L->errfunc != 0) { /* is there an error handling function? */
StkId errfunc = restorestack(L, L->errfunc);
lua_assert(ttisfunction(s2v(errfunc)));
setobjs2s(L, L->top, L->top - 1); /* move argument */
setobjs2s(L, L->top - 1, errfunc); /* push function */
L->top++; /* assume EXTRA_STACK */
luaD_callnoyield(L, L->top - 2, 1); /* call it */
}
luaD_throw(L, LUA_ERRRUN);
}
l_noret luaG_runerror (lua_State *L, const char *fmt, ...) {
CallInfo *ci = L->ci;
const char *msg;
va_list argp;
luaC_checkGC(L); /* error message uses memory */
va_start(argp, fmt);
msg = luaO_pushvfstring(L, fmt, argp); /* format message */
va_end(argp);
if (isLua(ci)) /* if Lua function, add source:line information */
luaG_addinfo(L, msg, ci_func(ci)->p->source, getcurrentline(ci));
luaG_errormsg(L);
}
/*
** Check whether new instruction 'newpc' is in a different line from
** previous instruction 'oldpc'.
*/
static int changedline (const Proto *p, int oldpc, int newpc) {
while (oldpc++ < newpc) {
if (p->lineinfo[oldpc] != 0)
return (luaG_getfuncline(p, oldpc - 1) != luaG_getfuncline(p, newpc));
}
return 0; /* no line changes in the way */
}
int luaG_traceexec (lua_State *L, const Instruction *pc) {
CallInfo *ci = L->ci;
lu_byte mask = L->hookmask;
int counthook;
if (!(mask & (LUA_MASKLINE | LUA_MASKCOUNT))) { /* no hooks? */
ci->u.l.trap = 0; /* don't need to stop again */
return 0; /* turn off 'trap' */
}
pc++; /* reference is always next instruction */
ci->u.l.savedpc = pc; /* save 'pc' */
counthook = (--L->hookcount == 0 && (mask & LUA_MASKCOUNT));
if (counthook)
resethookcount(L); /* reset count */
else if (!(mask & LUA_MASKLINE))
return 1; /* no line hook and count != 0; nothing to be done now */
if (ci->callstatus & CIST_HOOKYIELD) { /* called hook last time? */
ci->callstatus &= ~CIST_HOOKYIELD; /* erase mark */
return 1; /* do not call hook again (VM yielded, so it did not move) */
}
if (!isIT(*(ci->u.l.savedpc - 1)))
L->top = ci->top; /* prepare top */
if (counthook)
luaD_hook(L, LUA_HOOKCOUNT, -1, 0, 0); /* call count hook */
if (mask & LUA_MASKLINE) {
const Proto *p = ci_func(ci)->p;
int npci = pcRel(pc, p);
if (npci == 0 || /* call linehook when enter a new function, */
pc <= L->oldpc || /* when jump back (loop), or when */
changedline(p, pcRel(L->oldpc, p), npci)) { /* enter new line */
int newline = luaG_getfuncline(p, npci);
luaD_hook(L, LUA_HOOKLINE, newline, 0, 0); /* call line hook */
}
L->oldpc = pc; /* 'pc' of last call to line hook */
}
if (L->status == LUA_YIELD) { /* did hook yield? */
if (counthook)
L->hookcount = 1; /* undo decrement to zero */
ci->u.l.savedpc--; /* undo increment (resume will increment it again) */
ci->callstatus |= CIST_HOOKYIELD; /* mark that it yielded */
luaD_throw(L, LUA_YIELD);
}
return 1; /* keep 'trap' on */
}
LDO¶
/*
** $Id: ldo.h $
** Stack and Call structure of Lua
** See Copyright Notice in lua.h
*/
#ifndef ldo_h
#define ldo_h
#include "lobject.h"
#include "lstate.h"
#include "lzio.h"
#include "_native_lua_config.h" /* native Lua */
/*
** Macro to check stack size and grow stack if needed. Parameters
** 'pre'/'pos' allow the macro to preserve a pointer into the
** stack across reallocations, doing the work only when needed.
** 'condmovestack' is used in heavy tests to force a stack reallocation
** at every check.
*/
#define luaD_checkstackaux(L,n,pre,pos) \
if (L->stack_last - L->top <= (n)) \
{ pre; luaD_growstack(L, n, 1); pos; } \
else { condmovestack(L,pre,pos); }
/* In general, 'pre'/'pos' are empty (nothing to save) */
#define luaD_checkstack(L,n) luaD_checkstackaux(L,n,(void)0,(void)0)
#define savestack(L,p) ((char *)(p) - (char *)L->stack)
#define restorestack(L,n) ((StkId)((char *)L->stack + (n)))
/* macro to check stack size, preserving 'p' */
#define checkstackp(L,n,p) \
luaD_checkstackaux(L, n, \
ptrdiff_t t__ = savestack(L, p); /* save 'p' */ \
luaC_checkGC(L), /* stack grow uses memory */ \
p = restorestack(L, t__)) /* 'pos' part: restore 'p' */
/* macro to check stack size and GC */
#define checkstackGC(L,fsize) \
luaD_checkstackaux(L, (fsize), (void)0, luaC_checkGC(L))
/* type of protected functions, to be ran by 'runprotected' */
typedef void (*Pfunc) (lua_State *L, void *ud);
LUAI_FUNC void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop);
LUAI_FUNC int luaD_protectedparser (lua_State *L, ZIO *z, const char *name,
const char *mode);
LUAI_FUNC void luaD_hook (lua_State *L, int event, int line,
int fTransfer, int nTransfer);
LUAI_FUNC void luaD_hookcall (lua_State *L, CallInfo *ci);
LUAI_FUNC void luaD_pretailcall (lua_State *L, CallInfo *ci, StkId func, int n);
LUAI_FUNC void luaD_call (lua_State *L, StkId func, int nResults);
LUAI_FUNC void luaD_callnoyield (lua_State *L, StkId func, int nResults);
LUAI_FUNC void luaD_tryfuncTM (lua_State *L, StkId func);
LUAI_FUNC int luaD_pcall (lua_State *L, Pfunc func, void *u,
ptrdiff_t oldtop, ptrdiff_t ef);
LUAI_FUNC void luaD_poscall (lua_State *L, CallInfo *ci, int nres);
LUAI_FUNC int luaD_reallocstack (lua_State *L, int newsize, int raiseerror);
LUAI_FUNC int luaD_growstack (lua_State *L, int n, int raiseerror);
LUAI_FUNC void luaD_shrinkstack (lua_State *L);
LUAI_FUNC void luaD_inctop (lua_State *L);
LUAI_FUNC l_noret luaD_throw (lua_State *L, int errcode);
LUAI_FUNC int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud);
#endif
/*
** $Id: ldo.c $
** Stack and Call structure of Lua
** See Copyright Notice in lua.h
*/
#define ldo_c
#define LUA_CORE
#include "lprefix.h"
#include <setjmp.h>
#include <stdlib.h>
#include <string.h>
#include "lua.h"
#include "lapi.h"
#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "lgc.h"
#include "lmem.h"
#include "lobject.h"
#include "lopcodes.h"
#include "lparser.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "ltm.h"
#include "lundump.h"
#include "lvm.h"
#include "lzio.h"
#define errorstatus(s) ((s) > LUA_YIELD)
/*
** {======================================================
** Error-recovery functions
** =======================================================
*/
/*
** LUAI_THROW/LUAI_TRY define how Lua does exception handling. By
** default, Lua handles errors with exceptions when compiling as
** C++ code, with _longjmp/_setjmp when asked to use them, and with
** longjmp/setjmp otherwise.
*/
#if !defined(LUAI_THROW) /* { */
#if defined(__cplusplus) && !defined(LUA_USE_LONGJMP) /* { */
/* C++ exceptions */
#define LUAI_THROW(L,c) throw(c)
#define LUAI_TRY(L,c,a) \
try { a } catch(...) { if ((c)->status == 0) (c)->status = -1; }
#define luai_jmpbuf int /* dummy variable */
#elif defined(LUA_USE_POSIX) /* }{ */
/* in POSIX, try _longjmp/_setjmp (more efficient) */
#define LUAI_THROW(L,c) _longjmp((c)->b, 1)
#define LUAI_TRY(L,c,a) if (_setjmp((c)->b) == 0) { a }
#define luai_jmpbuf jmp_buf
#else /* }{ */
/* ISO C handling with long jumps */
#define LUAI_THROW(L,c) longjmp((c)->b, 1)
#define LUAI_TRY(L,c,a) if (setjmp((c)->b) == 0) { a }
#define luai_jmpbuf jmp_buf
#endif /* } */
#endif /* } */
/* chain list of long jump buffers */
struct lua_longjmp {
struct lua_longjmp *previous;
luai_jmpbuf b;
volatile int status; /* error code */
};
void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop) {
switch (errcode) {
case LUA_ERRMEM: { /* memory error? */
setsvalue2s(L, oldtop, G(L)->memerrmsg); /* reuse preregistered msg. */
break;
}
case LUA_ERRERR: {
setsvalue2s(L, oldtop, luaS_newliteral(L, "error in error handling"));
break;
}
case CLOSEPROTECT: {
setnilvalue(s2v(oldtop)); /* no error message */
break;
}
default: {
setobjs2s(L, oldtop, L->top - 1); /* error message on current top */
break;
}
}
L->top = oldtop + 1;
}
l_noret luaD_throw (lua_State *L, int errcode) {
if (L->errorJmp) { /* thread has an error handler? */
L->errorJmp->status = errcode; /* set status */
LUAI_THROW(L, L->errorJmp); /* jump to it */
}
else { /* thread has no error handler */
global_State *g = G(L);
errcode = luaF_close(L, L->stack, errcode); /* close all upvalues */
L->status = cast_byte(errcode); /* mark it as dead */
if (g->mainthread->errorJmp) { /* main thread has a handler? */
setobjs2s(L, g->mainthread->top++, L->top - 1); /* copy error obj. */
luaD_throw(g->mainthread, errcode); /* re-throw in main thread */
}
else { /* no handler at all; abort */
if (g->panic) { /* panic function? */
luaD_seterrorobj(L, errcode, L->top); /* assume EXTRA_STACK */
if (L->ci->top < L->top)
L->ci->top = L->top; /* pushing msg. can break this invariant */
lua_unlock(L);
g->panic(L); /* call panic function (last chance to jump out) */
}
abort();
}
}
}
int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud) {
global_State *g = G(L);
l_uint32 oldnCcalls = g->Cstacklimit - (L->nCcalls + L->nci);
struct lua_longjmp lj;
lj.status = LUA_OK;
lj.previous = L->errorJmp; /* chain new error handler */
L->errorJmp = &lj;
LUAI_TRY(L, &lj,
(*f)(L, ud);
);
L->errorJmp = lj.previous; /* restore old error handler */
L->nCcalls = g->Cstacklimit - oldnCcalls - L->nci;
return lj.status;
}
/* }====================================================== */
/*
** {==================================================================
** Stack reallocation
** ===================================================================
*/
static void correctstack (lua_State *L, StkId oldstack, StkId newstack) {
CallInfo *ci;
UpVal *up;
if (oldstack == newstack)
return; /* stack address did not change */
L->top = (L->top - oldstack) + newstack;
for (up = L->openupval; up != NULL; up = up->u.open.next)
up->v = s2v((uplevel(up) - oldstack) + newstack);
for (ci = L->ci; ci != NULL; ci = ci->previous) {
ci->top = (ci->top - oldstack) + newstack;
ci->func = (ci->func - oldstack) + newstack;
if (isLua(ci))
ci->u.l.trap = 1; /* signal to update 'trap' in 'luaV_execute' */
}
}
/* some space for error handling */
#define ERRORSTACKSIZE (LUAI_MAXSTACK + 200)
int luaD_reallocstack (lua_State *L, int newsize, int raiseerror) {
int lim = L->stacksize;
StkId newstack = luaM_reallocvector(L, L->stack, lim, newsize, StackValue);
lua_assert(newsize <= LUAI_MAXSTACK || newsize == ERRORSTACKSIZE);
lua_assert(L->stack_last - L->stack == L->stacksize - EXTRA_STACK);
if (unlikely(newstack == NULL)) { /* reallocation failed? */
if (raiseerror)
luaM_error(L);
else return 0; /* do not raise an error */
}
for (; lim < newsize; lim++)
setnilvalue(s2v(newstack + lim)); /* erase new segment */
correctstack(L, L->stack, newstack);
L->stack = newstack;
L->stacksize = newsize;
L->stack_last = L->stack + newsize - EXTRA_STACK;
return 1;
}
/*
** Try to grow the stack by at least 'n' elements. when 'raiseerror'
** is true, raises any error; otherwise, return 0 in case of errors.
*/
int luaD_growstack (lua_State *L, int n, int raiseerror) {
int size = L->stacksize;
int newsize = 2 * size; /* tentative new size */
if (unlikely(size > LUAI_MAXSTACK)) { /* need more space after extra size? */
if (raiseerror)
luaD_throw(L, LUA_ERRERR); /* error inside message handler */
else return 0;
}
else {
int needed = cast_int(L->top - L->stack) + n + EXTRA_STACK;
if (newsize > LUAI_MAXSTACK) /* cannot cross the limit */
newsize = LUAI_MAXSTACK;
if (newsize < needed) /* but must respect what was asked for */
newsize = needed;
if (unlikely(newsize > LUAI_MAXSTACK)) { /* stack overflow? */
/* add extra size to be able to handle the error message */
luaD_reallocstack(L, ERRORSTACKSIZE, raiseerror);
if (raiseerror)
luaG_runerror(L, "stack overflow");
else return 0;
}
} /* else no errors */
return luaD_reallocstack(L, newsize, raiseerror);
}
static int stackinuse (lua_State *L) {
CallInfo *ci;
StkId lim = L->top;
for (ci = L->ci; ci != NULL; ci = ci->previous) {
if (lim < ci->top) lim = ci->top;
}
lua_assert(lim <= L->stack_last);
return cast_int(lim - L->stack) + 1; /* part of stack in use */
}
void luaD_shrinkstack (lua_State *L) {
int inuse = stackinuse(L);
int goodsize = inuse + (inuse / 8) + 2*EXTRA_STACK;
if (goodsize > LUAI_MAXSTACK)
goodsize = LUAI_MAXSTACK; /* respect stack limit */
/* if thread is currently not handling a stack overflow and its
good size is smaller than current size, shrink its stack */
if (inuse <= (LUAI_MAXSTACK - EXTRA_STACK) &&
goodsize < L->stacksize)
luaD_reallocstack(L, goodsize, 0); /* ok if that fails */
else /* don't change stack */
condmovestack(L,{},{}); /* (change only for debugging) */
luaE_shrinkCI(L); /* shrink CI list */
}
void luaD_inctop (lua_State *L) {
luaD_checkstack(L, 1);
L->top++;
}
/* }================================================================== */
/*
** Call a hook for the given event. Make sure there is a hook to be
** called. (Both 'L->hook' and 'L->hookmask', which trigger this
** function, can be changed asynchronously by signals.)
*/
void luaD_hook (lua_State *L, int event, int line,
int ftransfer, int ntransfer) {
lua_Hook hook = L->hook;
if (hook && L->allowhook) { /* make sure there is a hook */
int mask = CIST_HOOKED;
CallInfo *ci = L->ci;
ptrdiff_t top = savestack(L, L->top);
ptrdiff_t ci_top = savestack(L, ci->top);
lua_Debug ar;
ar.event = event;
ar.currentline = line;
ar.i_ci = ci;
if (ntransfer != 0) {
mask |= CIST_TRAN; /* 'ci' has transfer information */
ci->u2.transferinfo.ftransfer = ftransfer;
ci->u2.transferinfo.ntransfer = ntransfer;
}
luaD_checkstack(L, LUA_MINSTACK); /* ensure minimum stack size */
if (L->top + LUA_MINSTACK > ci->top)
ci->top = L->top + LUA_MINSTACK;
L->allowhook = 0; /* cannot call hooks inside a hook */
ci->callstatus |= mask;
lua_unlock(L);
(*hook)(L, &ar);
lua_lock(L);
lua_assert(!L->allowhook);
L->allowhook = 1;
ci->top = restorestack(L, ci_top);
L->top = restorestack(L, top);
ci->callstatus &= ~mask;
}
}
/*
** Executes a call hook for Lua functions. This function is called
** whenever 'hookmask' is not zero, so it checks whether call hooks are
** active.
*/
void luaD_hookcall (lua_State *L, CallInfo *ci) {
int hook = (ci->callstatus & CIST_TAIL) ? LUA_HOOKTAILCALL : LUA_HOOKCALL;
Proto *p;
if (!(L->hookmask & LUA_MASKCALL)) /* some other hook? */
return; /* don't call hook */
p = clLvalue(s2v(ci->func))->p;
L->top = ci->top; /* prepare top */
ci->u.l.savedpc++; /* hooks assume 'pc' is already incremented */
luaD_hook(L, hook, -1, 1, p->numparams);
ci->u.l.savedpc--; /* correct 'pc' */
}
static StkId rethook (lua_State *L, CallInfo *ci, StkId firstres, int nres) {
ptrdiff_t oldtop = savestack(L, L->top); /* hook may change top */
int delta = 0;
if (isLuacode(ci)) {
Proto *p = clLvalue(s2v(ci->func))->p;
if (p->is_vararg)
delta = ci->u.l.nextraargs + p->numparams + 1;
if (L->top < ci->top)
L->top = ci->top; /* correct top to run hook */
}
if (L->hookmask & LUA_MASKRET) { /* is return hook on? */
int ftransfer;
ci->func += delta; /* if vararg, back to virtual 'func' */
ftransfer = cast(unsigned short, firstres - ci->func);
luaD_hook(L, LUA_HOOKRET, -1, ftransfer, nres); /* call it */
ci->func -= delta;
}
if (isLua(ci->previous))
L->oldpc = ci->previous->u.l.savedpc; /* update 'oldpc' */
return restorestack(L, oldtop);
}
/*
** Check whether 'func' has a '__call' metafield. If so, put it in the
** stack, below original 'func', so that 'luaD_call' can call it. Raise
** an error if there is no '__call' metafield.
*/
void luaD_tryfuncTM (lua_State *L, StkId func) {
const TValue *tm = luaT_gettmbyobj(L, s2v(func), TM_CALL);
StkId p;
if (unlikely(ttisnil(tm)))
luaG_typeerror(L, s2v(func), "call"); /* nothing to call */
for (p = L->top; p > func; p--) /* open space for metamethod */
setobjs2s(L, p, p-1);
L->top++; /* stack space pre-allocated by the caller */
setobj2s(L, func, tm); /* metamethod is the new function to be called */
}
/*
** Given 'nres' results at 'firstResult', move 'wanted' of them to 'res'.
** Handle most typical cases (zero results for commands, one result for
** expressions, multiple results for tail calls/single parameters)
** separated.
*/
static void moveresults (lua_State *L, StkId res, int nres, int wanted) {
StkId firstresult;
int i;
switch (wanted) { /* handle typical cases separately */
case 0: /* no values needed */
L->top = res;
return;
case 1: /* one value needed */
if (nres == 0) /* no results? */
setnilvalue(s2v(res)); /* adjust with nil */
else
setobjs2s(L, res, L->top - nres); /* move it to proper place */
L->top = res + 1;
return;
case LUA_MULTRET:
wanted = nres; /* we want all results */
break;
default: /* multiple results (or to-be-closed variables) */
if (hastocloseCfunc(wanted)) { /* to-be-closed variables? */
ptrdiff_t savedres = savestack(L, res);
luaF_close(L, res, LUA_OK); /* may change the stack */
res = restorestack(L, savedres);
wanted = codeNresults(wanted); /* correct value */
if (wanted == LUA_MULTRET)
wanted = nres;
}
break;
}
firstresult = L->top - nres; /* index of first result */
/* move all results to correct place */
for (i = 0; i < nres && i < wanted; i++)
setobjs2s(L, res + i, firstresult + i);
for (; i < wanted; i++) /* complete wanted number of results */
setnilvalue(s2v(res + i));
L->top = res + wanted; /* top points after the last result */
}
/*
** Finishes a function call: calls hook if necessary, removes CallInfo,
** moves current number of results to proper place.
*/
void luaD_poscall (lua_State *L, CallInfo *ci, int nres) {
if (L->hookmask)
L->top = rethook(L, ci, L->top - nres, nres);
L->ci = ci->previous; /* back to caller */
/* move results to proper place */
moveresults(L, ci->func, nres, ci->nresults);
}
#define next_ci(L) (L->ci->next ? L->ci->next : luaE_extendCI(L))
/*
** Prepare a function for a tail call, building its call info on top
** of the current call info. 'narg1' is the number of arguments plus 1
** (so that it includes the function itself).
*/
void luaD_pretailcall (lua_State *L, CallInfo *ci, StkId func, int narg1) {
Proto *p = clLvalue(s2v(func))->p;
int fsize = p->maxstacksize; /* frame size */
int nfixparams = p->numparams;
int i;
for (i = 0; i < narg1; i++) /* move down function and arguments */
setobjs2s(L, ci->func + i, func + i);
checkstackGC(L, fsize);
func = ci->func; /* moved-down function */
for (; narg1 <= nfixparams; narg1++)
setnilvalue(s2v(func + narg1)); /* complete missing arguments */
ci->top = func + 1 + fsize; /* top for new function */
lua_assert(ci->top <= L->stack_last);
ci->u.l.savedpc = p->code; /* starting point */
ci->callstatus |= CIST_TAIL;
L->top = func + narg1; /* set top */
}
/*
** Call a function (C or Lua). The function to be called is at *func.
** The arguments are on the stack, right after the function.
** When returns, all the results are on the stack, starting at the original
** function position.
*/
void luaD_call (lua_State *L, StkId func, int nresults) {
lua_CFunction f;
retry:
switch (ttypetag(s2v(func))) {
case LUA_VCCL: /* C closure */
f = clCvalue(s2v(func))->f;
goto Cfunc;
case LUA_VLCF: /* light C function */
f = fvalue(s2v(func));
Cfunc: {
int n; /* number of returns */
CallInfo *ci = next_ci(L);
checkstackp(L, LUA_MINSTACK, func); /* ensure minimum stack size */
ci->nresults = nresults;
ci->callstatus = CIST_C;
ci->top = L->top + LUA_MINSTACK;
ci->func = func;
L->ci = ci;
lua_assert(ci->top <= L->stack_last);
if (L->hookmask & LUA_MASKCALL) {
int narg = cast_int(L->top - func) - 1;
luaD_hook(L, LUA_HOOKCALL, -1, 1, narg);
}
lua_unlock(L);
n = (*f)(L); /* do the actual call */
lua_lock(L);
api_checknelems(L, n);
luaD_poscall(L, ci, n);
break;
}
case LUA_VLCL: { /* Lua function */
CallInfo *ci = next_ci(L);
Proto *p = clLvalue(s2v(func))->p;
int narg = cast_int(L->top - func) - 1; /* number of real arguments */
int nfixparams = p->numparams;
int fsize = p->maxstacksize; /* frame size */
checkstackp(L, fsize, func);
ci->nresults = nresults;
ci->u.l.savedpc = p->code; /* starting point */
ci->callstatus = 0;
ci->top = func + 1 + fsize;
ci->func = func;
L->ci = ci;
for (; narg < nfixparams; narg++)
setnilvalue(s2v(L->top++)); /* complete missing arguments */
lua_assert(ci->top <= L->stack_last);
luaV_execute(L, ci); /* run the function */
break;
}
default: { /* not a function */
checkstackp(L, 1, func); /* space for metamethod */
luaD_tryfuncTM(L, func); /* try to get '__call' metamethod */
goto retry; /* try again with metamethod */
}
}
}
/*
** Similar to 'luaD_call', but does not allow yields during the call.
** If there is a stack overflow, freeing all CI structures will
** force the subsequent call to invoke 'luaE_extendCI', which then
** will raise any errors.
*/
void luaD_callnoyield (lua_State *L, StkId func, int nResults) {
incXCcalls(L);
if (getCcalls(L) <= CSTACKERR) /* possible stack overflow? */
luaE_freeCI(L);
luaD_call(L, func, nResults);
decXCcalls(L);
}
/*
** Completes the execution of an interrupted C function, calling its
** continuation function.
*/
static void finishCcall (lua_State *L, int status) {
CallInfo *ci = L->ci;
int n;
/* must have a continuation and must be able to call it */
lua_assert(ci->u.c.k != NULL && yieldable(L));
/* error status can only happen in a protected call */
lua_assert((ci->callstatus & CIST_YPCALL) || status == LUA_YIELD);
if (ci->callstatus & CIST_YPCALL) { /* was inside a pcall? */
ci->callstatus &= ~CIST_YPCALL; /* continuation is also inside it */
L->errfunc = ci->u.c.old_errfunc; /* with the same error function */
}
/* finish 'lua_callk'/'lua_pcall'; CIST_YPCALL and 'errfunc' already
handled */
adjustresults(L, ci->nresults);
lua_unlock(L);
n = (*ci->u.c.k)(L, status, ci->u.c.ctx); /* call continuation function */
lua_lock(L);
api_checknelems(L, n);
luaD_poscall(L, ci, n); /* finish 'luaD_call' */
}
/*
** Executes "full continuation" (everything in the stack) of a
** previously interrupted coroutine until the stack is empty (or another
** interruption long-jumps out of the loop). If the coroutine is
** recovering from an error, 'ud' points to the error status, which must
** be passed to the first continuation function (otherwise the default
** status is LUA_YIELD).
*/
static void unroll (lua_State *L, void *ud) {
CallInfo *ci;
if (ud != NULL) /* error status? */
finishCcall(L, *(int *)ud); /* finish 'lua_pcallk' callee */
while ((ci = L->ci) != &L->base_ci) { /* something in the stack */
if (!isLua(ci)) /* C function? */
finishCcall(L, LUA_YIELD); /* complete its execution */
else { /* Lua function */
luaV_finishOp(L); /* finish interrupted instruction */
luaV_execute(L, ci); /* execute down to higher C 'boundary' */
}
}
}
/*
** Try to find a suspended protected call (a "recover point") for the
** given thread.
*/
static CallInfo *findpcall (lua_State *L) {
CallInfo *ci;
for (ci = L->ci; ci != NULL; ci = ci->previous) { /* search for a pcall */
if (ci->callstatus & CIST_YPCALL)
return ci;
}
return NULL; /* no pending pcall */
}
/*
** Recovers from an error in a coroutine. Finds a recover point (if
** there is one) and completes the execution of the interrupted
** 'luaD_pcall'. If there is no recover point, returns zero.
*/
static int recover (lua_State *L, int status) {
StkId oldtop;
CallInfo *ci = findpcall(L);
if (ci == NULL) return 0; /* no recovery point */
/* "finish" luaD_pcall */
oldtop = restorestack(L, ci->u2.funcidx);
luaF_close(L, oldtop, status); /* may change the stack */
oldtop = restorestack(L, ci->u2.funcidx);
luaD_seterrorobj(L, status, oldtop);
L->ci = ci;
L->allowhook = getoah(ci->callstatus); /* restore original 'allowhook' */
luaD_shrinkstack(L);
L->errfunc = ci->u.c.old_errfunc;
return 1; /* continue running the coroutine */
}
/*
** Signal an error in the call to 'lua_resume', not in the execution
** of the coroutine itself. (Such errors should not be handled by any
** coroutine error handler and should not kill the coroutine.)
*/
static int resume_error (lua_State *L, const char *msg, int narg) {
L->top -= narg; /* remove args from the stack */
setsvalue2s(L, L->top, luaS_new(L, msg)); /* push error message */
api_incr_top(L);
lua_unlock(L);
return LUA_ERRRUN;
}
/*
** Do the work for 'lua_resume' in protected mode. Most of the work
** depends on the status of the coroutine: initial state, suspended
** inside a hook, or regularly suspended (optionally with a continuation
** function), plus erroneous cases: non-suspended coroutine or dead
** coroutine.
*/
static void resume (lua_State *L, void *ud) {
int n = *(cast(int*, ud)); /* number of arguments */
StkId firstArg = L->top - n; /* first argument */
CallInfo *ci = L->ci;
if (L->status == LUA_OK) { /* starting a coroutine? */
luaD_call(L, firstArg - 1, LUA_MULTRET);
}
else { /* resuming from previous yield */
lua_assert(L->status == LUA_YIELD);
L->status = LUA_OK; /* mark that it is running (again) */
if (isLua(ci)) /* yielded inside a hook? */
luaV_execute(L, ci); /* just continue running Lua code */
else { /* 'common' yield */
if (ci->u.c.k != NULL) { /* does it have a continuation function? */
lua_unlock(L);
n = (*ci->u.c.k)(L, LUA_YIELD, ci->u.c.ctx); /* call continuation */
lua_lock(L);
api_checknelems(L, n);
}
luaD_poscall(L, ci, n); /* finish 'luaD_call' */
}
unroll(L, NULL); /* run continuation */
}
}
LUA_API int lua_resume (lua_State *L, lua_State *from, int nargs,
int *nresults) {
int status;
lua_lock(L);
if (L->status == LUA_OK) { /* may be starting a coroutine */
if (L->ci != &L->base_ci) /* not in base level? */
return resume_error(L, "cannot resume non-suspended coroutine", nargs);
else if (L->top - (L->ci->func + 1) == nargs) /* no function? */
return resume_error(L, "cannot resume dead coroutine", nargs);
}
else if (L->status != LUA_YIELD) /* ended with errors? */
return resume_error(L, "cannot resume dead coroutine", nargs);
if (from == NULL)
L->nCcalls = CSTACKTHREAD;
else /* correct 'nCcalls' for this thread */
L->nCcalls = getCcalls(from) + from->nci - L->nci - CSTACKCF;
if (L->nCcalls <= CSTACKERR)
return resume_error(L, "C stack overflow", nargs);
luai_userstateresume(L, nargs);
api_checknelems(L, (L->status == LUA_OK) ? nargs + 1 : nargs);
status = luaD_rawrunprotected(L, resume, &nargs);
/* continue running after recoverable errors */
while (errorstatus(status) && recover(L, status)) {
/* unroll continuation */
status = luaD_rawrunprotected(L, unroll, &status);
}
if (likely(!errorstatus(status)))
lua_assert(status == L->status); /* normal end or yield */
else { /* unrecoverable error */
L->status = cast_byte(status); /* mark thread as 'dead' */
luaD_seterrorobj(L, status, L->top); /* push error message */
L->ci->top = L->top;
}
*nresults = (status == LUA_YIELD) ? L->ci->u2.nyield
: cast_int(L->top - (L->ci->func + 1));
lua_unlock(L);
return status;
}
LUA_API int lua_isyieldable (lua_State *L) {
return yieldable(L);
}
LUA_API int lua_yieldk (lua_State *L, int nresults, lua_KContext ctx,
lua_KFunction k) {
CallInfo *ci = L->ci;
luai_userstateyield(L, nresults);
lua_lock(L);
api_checknelems(L, nresults);
if (unlikely(!yieldable(L))) {
if (L != G(L)->mainthread)
luaG_runerror(L, "attempt to yield across a C-call boundary");
else
luaG_runerror(L, "attempt to yield from outside a coroutine");
}
L->status = LUA_YIELD;
if (isLua(ci)) { /* inside a hook? */
lua_assert(!isLuacode(ci));
api_check(L, k == NULL, "hooks cannot continue after yielding");
ci->u2.nyield = 0; /* no results */
}
else {
if ((ci->u.c.k = k) != NULL) /* is there a continuation? */
ci->u.c.ctx = ctx; /* save context */
ci->u2.nyield = nresults; /* save number of results */
luaD_throw(L, LUA_YIELD);
}
lua_assert(ci->callstatus & CIST_HOOKED); /* must be inside a hook */
lua_unlock(L);
return 0; /* return to 'luaD_hook' */
}
/*
** Call the C function 'func' in protected mode, restoring basic
** thread information ('allowhook', etc.) and in particular
** its stack level in case of errors.
*/
int luaD_pcall (lua_State *L, Pfunc func, void *u,
ptrdiff_t old_top, ptrdiff_t ef) {
int status;
CallInfo *old_ci = L->ci;
lu_byte old_allowhooks = L->allowhook;
ptrdiff_t old_errfunc = L->errfunc;
L->errfunc = ef;
status = luaD_rawrunprotected(L, func, u);
if (unlikely(status != LUA_OK)) { /* an error occurred? */
StkId oldtop = restorestack(L, old_top);
L->ci = old_ci;
L->allowhook = old_allowhooks;
status = luaF_close(L, oldtop, status);
oldtop = restorestack(L, old_top); /* previous call may change stack */
luaD_seterrorobj(L, status, oldtop);
luaD_shrinkstack(L);
}
L->errfunc = old_errfunc;
return status;
}
/*
** Execute a protected parser.
*/
struct SParser { /* data to 'f_parser' */
ZIO *z;
Mbuffer buff; /* dynamic structure used by the scanner */
Dyndata dyd; /* dynamic structures used by the parser */
const char *mode;
const char *name;
};
static void checkmode (lua_State *L, const char *mode, const char *x) {
if (mode && strchr(mode, x[0]) == NULL) {
luaO_pushfstring(L,
"attempt to load a %s chunk (mode is '%s')", x, mode);
luaD_throw(L, LUA_ERRSYNTAX);
}
}
static void f_parser (lua_State *L, void *ud) {
LClosure *cl;
struct SParser *p = cast(struct SParser *, ud);
int c = zgetc(p->z); /* read first character */
if (c == LUA_SIGNATURE[0]) {
checkmode(L, p->mode, "binary");
cl = luaU_undump(L, p->z, p->name);
}
else {
checkmode(L, p->mode, "text");
cl = luaY_parser(L, p->z, &p->buff, &p->dyd, p->name, c);
}
lua_assert(cl->nupvalues == cl->p->sizeupvalues);
luaF_initupvals(L, cl);
}
int luaD_protectedparser (lua_State *L, ZIO *z, const char *name,
const char *mode) {
struct SParser p;
int status;
incnny(L); /* cannot yield during parsing */
p.z = z; p.name = name; p.mode = mode;
p.dyd.actvar.arr = NULL; p.dyd.actvar.size = 0;
p.dyd.gt.arr = NULL; p.dyd.gt.size = 0;
p.dyd.label.arr = NULL; p.dyd.label.size = 0;
luaZ_initbuffer(L, &p.buff);
status = luaD_pcall(L, f_parser, &p, savestack(L, L->top), L->errfunc);
luaZ_freebuffer(L, &p.buff);
luaM_freearray(L, p.dyd.actvar.arr, p.dyd.actvar.size);
luaM_freearray(L, p.dyd.gt.arr, p.dyd.gt.size);
luaM_freearray(L, p.dyd.label.arr, p.dyd.label.size);
decnny(L);
return status;
}
LDUMP¶
/*
** $Id: ldump.c $
** save precompiled Lua chunks
** See Copyright Notice in lua.h
*/
#define ldump_c
#define LUA_CORE
#include "lprefix.h"
#include <stddef.h>
#include "lua.h"
#include "lobject.h"
#include "lstate.h"
#include "lundump.h"
#include "_native_lua_config.h" /* native Lua */
typedef struct {
lua_State *L;
lua_Writer writer;
void *data;
int strip;
int status;
} DumpState;
/*
** All high-level dumps go through dumpVector; you can change it to
** change the endianness of the result
*/
#define dumpVector(D,v,n) dumpBlock(D,v,(n)*sizeof((v)[0]))
#define dumpLiteral(D, s) dumpBlock(D,s,sizeof(s) - sizeof(char))
static void dumpBlock (DumpState *D, const void *b, size_t size) {
if (D->status == 0 && size > 0) {
lua_unlock(D->L);
D->status = (*D->writer)(D->L, b, size, D->data);
lua_lock(D->L);
}
}
#define dumpVar(D,x) dumpVector(D,&x,1)
static void dumpByte (DumpState *D, int y) {
lu_byte x = (lu_byte)y;
dumpVar(D, x);
}
/* dumpInt Buff Size */
#define DIBS ((sizeof(size_t) * 8 / 7) + 1)
static void dumpSize (DumpState *D, size_t x) {
lu_byte buff[DIBS];
int n = 0;
do {
buff[DIBS - (++n)] = x & 0x7f; /* fill buffer in reverse order */
x >>= 7;
} while (x != 0);
buff[DIBS - 1] |= 0x80; /* mark last byte */
dumpVector(D, buff + DIBS - n, n);
}
static void dumpInt (DumpState *D, int x) {
dumpSize(D, x);
}
static void dumpNumber (DumpState *D, lua_Number x) {
dumpVar(D, x);
}
static void dumpInteger (DumpState *D, lua_Integer x) {
dumpVar(D, x);
}
static void dumpString (DumpState *D, const TString *s) {
if (s == NULL)
dumpSize(D, 0);
else {
size_t size = tsslen(s);
const char *str = getstr(s);
dumpSize(D, size + 1);
dumpVector(D, str, size);
}
}
static void dumpCode (DumpState *D, const Proto *f) {
dumpInt(D, f->sizecode);
dumpVector(D, f->code, f->sizecode);
}
static void dumpFunction(DumpState *D, const Proto *f, TString *psource);
static void dumpConstants (DumpState *D, const Proto *f) {
int i;
int n = f->sizek;
dumpInt(D, n);
for (i = 0; i < n; i++) {
const TValue *o = &f->k[i];
int tt = ttypetag(o);
dumpByte(D, tt);
switch (tt) {
case LUA_VNUMFLT:
dumpNumber(D, fltvalue(o));
break;
case LUA_VNUMINT:
dumpInteger(D, ivalue(o));
break;
case LUA_VSHRSTR:
case LUA_VLNGSTR:
dumpString(D, tsvalue(o));
break;
default:
lua_assert(tt == LUA_VNIL || tt == LUA_VFALSE || tt == LUA_VTRUE);
}
}
}
static void dumpProtos (DumpState *D, const Proto *f) {
int i;
int n = f->sizep;
dumpInt(D, n);
for (i = 0; i < n; i++)
dumpFunction(D, f->p[i], f->source);
}
static void dumpUpvalues (DumpState *D, const Proto *f) {
int i, n = f->sizeupvalues;
dumpInt(D, n);
for (i = 0; i < n; i++) {
dumpByte(D, f->upvalues[i].instack);
dumpByte(D, f->upvalues[i].idx);
dumpByte(D, f->upvalues[i].kind);
}
}
static void dumpDebug (DumpState *D, const Proto *f) {
int i, n;
n = (D->strip) ? 0 : f->sizelineinfo;
dumpInt(D, n);
dumpVector(D, f->lineinfo, n);
n = (D->strip) ? 0 : f->sizeabslineinfo;
dumpInt(D, n);
for (i = 0; i < n; i++) {
dumpInt(D, f->abslineinfo[i].pc);
dumpInt(D, f->abslineinfo[i].line);
}
n = (D->strip) ? 0 : f->sizelocvars;
dumpInt(D, n);
for (i = 0; i < n; i++) {
dumpString(D, f->locvars[i].varname);
dumpInt(D, f->locvars[i].startpc);
dumpInt(D, f->locvars[i].endpc);
}
n = (D->strip) ? 0 : f->sizeupvalues;
dumpInt(D, n);
for (i = 0; i < n; i++)
dumpString(D, f->upvalues[i].name);
}
static void dumpFunction (DumpState *D, const Proto *f, TString *psource) {
if (D->strip || f->source == psource)
dumpString(D, NULL); /* no debug info or same source as its parent */
else
dumpString(D, f->source);
dumpInt(D, f->linedefined);
dumpInt(D, f->lastlinedefined);
dumpByte(D, f->numparams);
dumpByte(D, f->is_vararg);
dumpByte(D, f->maxstacksize);
dumpCode(D, f);
dumpConstants(D, f);
dumpUpvalues(D, f);
dumpProtos(D, f);
dumpDebug(D, f);
}
static void dumpHeader (DumpState *D) {
dumpLiteral(D, LUA_SIGNATURE);
dumpByte(D, LUAC_VERSION);
dumpByte(D, LUAC_FORMAT);
dumpLiteral(D, LUAC_DATA);
dumpByte(D, sizeof(Instruction));
dumpByte(D, sizeof(lua_Integer));
dumpByte(D, sizeof(lua_Number));
dumpInteger(D, LUAC_INT);
dumpNumber(D, LUAC_NUM);
}
/*
** dump Lua function as precompiled chunk
*/
int luaU_dump(lua_State *L, const Proto *f, lua_Writer w, void *data,
int strip) {
DumpState D;
D.L = L;
D.writer = w;
D.data = data;
D.strip = strip;
D.status = 0;
dumpHeader(&D);
dumpByte(&D, f->sizeupvalues);
dumpFunction(&D, f, NULL);
return D.status;
}
LFUNC¶
/*
** $Id: lfunc.h $
** Auxiliary functions to manipulate prototypes and closures
** See Copyright Notice in lua.h
*/
#ifndef lfunc_h
#define lfunc_h
#include "lobject.h"
#include "_native_lua_config.h" /* native Lua */
#define sizeCclosure(n) (cast_int(offsetof(CClosure, upvalue)) + \
cast_int(sizeof(TValue)) * (n))
#define sizeLclosure(n) (cast_int(offsetof(LClosure, upvals)) + \
cast_int(sizeof(TValue *)) * (n))
/* test whether thread is in 'twups' list */
#define isintwups(L) (L->twups != L)
/*
** maximum number of upvalues in a closure (both C and Lua). (Value
** must fit in a VM register.)
*/
#define MAXUPVAL 255
#define upisopen(up) ((up)->v != &(up)->u.value)
#define uplevel(up) check_exp(upisopen(up), cast(StkId, (up)->v))
/*
** maximum number of misses before giving up the cache of closures
** in prototypes
*/
#define MAXMISS 10
/*
** Special "status" for 'luaF_close'
*/
/* close upvalues without running their closing methods */
#define NOCLOSINGMETH (-1)
/* close upvalues running all closing methods in protected mode */
#define CLOSEPROTECT (-2)
LUAI_FUNC Proto *luaF_newproto (lua_State *L);
LUAI_FUNC CClosure *luaF_newCclosure (lua_State *L, int nupvals);
LUAI_FUNC LClosure *luaF_newLclosure (lua_State *L, int nupvals);
LUAI_FUNC void luaF_initupvals (lua_State *L, LClosure *cl);
LUAI_FUNC UpVal *luaF_findupval (lua_State *L, StkId level);
LUAI_FUNC void luaF_newtbcupval (lua_State *L, StkId level);
LUAI_FUNC int luaF_close (lua_State *L, StkId level, int status);
LUAI_FUNC void luaF_unlinkupval (UpVal *uv);
LUAI_FUNC void luaF_freeproto (lua_State *L, Proto *f);
LUAI_FUNC const char *luaF_getlocalname (const Proto *func, int local_number,
int pc);
#endif
/*
** $Id: lfunc.c $
** Auxiliary functions to manipulate prototypes and closures
** See Copyright Notice in lua.h
*/
#define lfunc_c
#define LUA_CORE
#include "lprefix.h"
#include <stddef.h>
#include "lua.h"
#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "lgc.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
CClosure *luaF_newCclosure (lua_State *L, int nupvals) {
GCObject *o = luaC_newobj(L, LUA_VCCL, sizeCclosure(nupvals));
CClosure *c = gco2ccl(o);
c->nupvalues = cast_byte(nupvals);
return c;
}
LClosure *luaF_newLclosure (lua_State *L, int nupvals) {
GCObject *o = luaC_newobj(L, LUA_VLCL, sizeLclosure(nupvals));
LClosure *c = gco2lcl(o);
c->p = NULL;
c->nupvalues = cast_byte(nupvals);
while (nupvals--) c->upvals[nupvals] = NULL;
return c;
}
/*
** fill a closure with new closed upvalues
*/
void luaF_initupvals (lua_State *L, LClosure *cl) {
int i;
for (i = 0; i < cl->nupvalues; i++) {
GCObject *o = luaC_newobj(L, LUA_VUPVAL, sizeof(UpVal));
UpVal *uv = gco2upv(o);
uv->v = &uv->u.value; /* make it closed */
setnilvalue(uv->v);
cl->upvals[i] = uv;
luaC_objbarrier(L, cl, o);
}
}
/*
** Create a new upvalue at the given level, and link it to the list of
** open upvalues of 'L' after entry 'prev'.
**/
static UpVal *newupval (lua_State *L, int tbc, StkId level, UpVal **prev) {
GCObject *o = luaC_newobj(L, LUA_VUPVAL, sizeof(UpVal));
UpVal *uv = gco2upv(o);
UpVal *next = *prev;
uv->v = s2v(level); /* current value lives in the stack */
uv->tbc = tbc;
uv->u.open.next = next; /* link it to list of open upvalues */
uv->u.open.previous = prev;
if (next)
next->u.open.previous = &uv->u.open.next;
*prev = uv;
if (!isintwups(L)) { /* thread not in list of threads with upvalues? */
L->twups = G(L)->twups; /* link it to the list */
G(L)->twups = L;
}
return uv;
}
/*
** Find and reuse, or create if it does not exist, an upvalue
** at the given level.
*/
UpVal *luaF_findupval (lua_State *L, StkId level) {
UpVal **pp = &L->openupval;
UpVal *p;
lua_assert(isintwups(L) || L->openupval == NULL);
while ((p = *pp) != NULL && uplevel(p) >= level) { /* search for it */
lua_assert(!isdead(G(L), p));
if (uplevel(p) == level) /* corresponding upvalue? */
return p; /* return it */
pp = &p->u.open.next;
}
/* not found: create a new upvalue after 'pp' */
return newupval(L, 0, level, pp);
}
static void callclose (lua_State *L, void *ud) {
UNUSED(ud);
luaD_callnoyield(L, L->top - 3, 0);
}
/*
** Prepare closing method plus its arguments for object 'obj' with
** error message 'err'. (This function assumes EXTRA_STACK.)
*/
static int prepclosingmethod (lua_State *L, TValue *obj, TValue *err) {
StkId top = L->top;
const TValue *tm = luaT_gettmbyobj(L, obj, TM_CLOSE);
if (ttisnil(tm)) /* no metamethod? */
return 0; /* nothing to call */
setobj2s(L, top, tm); /* will call metamethod... */
setobj2s(L, top + 1, obj); /* with 'self' as the 1st argument */
setobj2s(L, top + 2, err); /* and error msg. as 2nd argument */
L->top = top + 3; /* add function and arguments */
return 1;
}
/*
** Raise an error with message 'msg', inserting the name of the
** local variable at position 'level' in the stack.
*/
static void varerror (lua_State *L, StkId level, const char *msg) {
int idx = cast_int(level - L->ci->func);
const char *vname = luaG_findlocal(L, L->ci, idx, NULL);
if (vname == NULL) vname = "?";
luaG_runerror(L, msg, vname);
}
/*
** Prepare and call a closing method. If status is OK, code is still
** inside the original protected call, and so any error will be handled
** there. Otherwise, a previous error already activated the original
** protected call, and so the call to the closing method must be
** protected here. (A status == CLOSEPROTECT behaves like a previous
** error, to also run the closing method in protected mode).
** If status is OK, the call to the closing method will be pushed
** at the top of the stack. Otherwise, values are pushed after
** the 'level' of the upvalue being closed, as everything after
** that won't be used again.
*/
static int callclosemth (lua_State *L, StkId level, int status) {
TValue *uv = s2v(level); /* value being closed */
if (likely(status == LUA_OK)) {
if (prepclosingmethod(L, uv, &G(L)->nilvalue)) /* something to call? */
callclose(L, NULL); /* call closing method */
else if (!l_isfalse(uv)) /* non-closable non-false value? */
varerror(L, level, "attempt to close non-closable variable '%s'");
}
else { /* must close the object in protected mode */
ptrdiff_t oldtop;
level++; /* space for error message */
oldtop = savestack(L, level + 1); /* top will be after that */
luaD_seterrorobj(L, status, level); /* set error message */
if (prepclosingmethod(L, uv, s2v(level))) { /* something to call? */
int newstatus = luaD_pcall(L, callclose, NULL, oldtop, 0);
if (newstatus != LUA_OK && status == CLOSEPROTECT) /* first error? */
status = newstatus; /* this will be the new error */
else {
if (newstatus != LUA_OK) /* suppressed error? */
luaE_warnerror(L, "__close metamethod");
/* leave original error (or nil) on top */
L->top = restorestack(L, oldtop);
}
}
/* else no metamethod; ignore this case and keep original error */
}
return status;
}
/*
** Try to create a to-be-closed upvalue
** (can raise a memory-allocation error)
*/
static void trynewtbcupval (lua_State *L, void *ud) {
newupval(L, 1, cast(StkId, ud), &L->openupval);
}
/*
** Create a to-be-closed upvalue. If there is a memory error
** when creating the upvalue, the closing method must be called here,
** as there is no upvalue to call it later.
*/
void luaF_newtbcupval (lua_State *L, StkId level) {
TValue *obj = s2v(level);
lua_assert(L->openupval == NULL || uplevel(L->openupval) < level);
if (!l_isfalse(obj)) { /* false doesn't need to be closed */
int status;
const TValue *tm = luaT_gettmbyobj(L, obj, TM_CLOSE);
if (ttisnil(tm)) /* no metamethod? */
varerror(L, level, "variable '%s' got a non-closable value");
status = luaD_rawrunprotected(L, trynewtbcupval, level);
if (unlikely(status != LUA_OK)) { /* memory error creating upvalue? */
lua_assert(status == LUA_ERRMEM);
luaD_seterrorobj(L, LUA_ERRMEM, level + 1); /* save error message */
/* next call must succeed, as object is closable */
prepclosingmethod(L, s2v(level), s2v(level + 1));
callclose(L, NULL); /* call closing method */
luaD_throw(L, LUA_ERRMEM); /* throw memory error */
}
}
}
void luaF_unlinkupval (UpVal *uv) {
lua_assert(upisopen(uv));
*uv->u.open.previous = uv->u.open.next;
if (uv->u.open.next)
uv->u.open.next->u.open.previous = uv->u.open.previous;
}
int luaF_close (lua_State *L, StkId level, int status) {
UpVal *uv;
while ((uv = L->openupval) != NULL && uplevel(uv) >= level) {
TValue *slot = &uv->u.value; /* new position for value */
lua_assert(uplevel(uv) < L->top);
if (uv->tbc && status != NOCLOSINGMETH) {
/* must run closing method, which may change the stack */
ptrdiff_t levelrel = savestack(L, level);
status = callclosemth(L, uplevel(uv), status);
level = restorestack(L, levelrel);
}
luaF_unlinkupval(uv);
setobj(L, slot, uv->v); /* move value to upvalue slot */
uv->v = slot; /* now current value lives here */
if (!iswhite(uv))
gray2black(uv); /* closed upvalues cannot be gray */
luaC_barrier(L, uv, slot);
}
return status;
}
Proto *luaF_newproto (lua_State *L) {
GCObject *o = luaC_newobj(L, LUA_VPROTO, sizeof(Proto));
Proto *f = gco2p(o);
f->k = NULL;
f->sizek = 0;
f->p = NULL;
f->sizep = 0;
f->code = NULL;
f->sizecode = 0;
f->lineinfo = NULL;
f->sizelineinfo = 0;
f->abslineinfo = NULL;
f->sizeabslineinfo = 0;
f->upvalues = NULL;
f->sizeupvalues = 0;
f->numparams = 0;
f->is_vararg = 0;
f->maxstacksize = 0;
f->locvars = NULL;
f->sizelocvars = 0;
f->linedefined = 0;
f->lastlinedefined = 0;
f->source = NULL;
return f;
}
void luaF_freeproto (lua_State *L, Proto *f) {
luaM_freearray(L, f->code, f->sizecode);
luaM_freearray(L, f->p, f->sizep);
luaM_freearray(L, f->k, f->sizek);
luaM_freearray(L, f->lineinfo, f->sizelineinfo);
luaM_freearray(L, f->abslineinfo, f->sizeabslineinfo);
luaM_freearray(L, f->locvars, f->sizelocvars);
luaM_freearray(L, f->upvalues, f->sizeupvalues);
luaM_free(L, f);
}
/*
** Look for n-th local variable at line 'line' in function 'func'.
** Returns NULL if not found.
*/
const char *luaF_getlocalname (const Proto *f, int local_number, int pc) {
int i;
for (i = 0; i<f->sizelocvars && f->locvars[i].startpc <= pc; i++) {
if (pc < f->locvars[i].endpc) { /* is variable active? */
local_number--;
if (local_number == 0)
return getstr(f->locvars[i].varname);
}
}
return NULL; /* not found */
}
LGC¶
/*
** $Id: lgc.h $
** Garbage Collector
** See Copyright Notice in lua.h
*/
#ifndef lgc_h
#define lgc_h
#include "lobject.h"
#include "lstate.h"
#include "_native_lua_config.h" /* native Lua */
/*
** Collectable objects may have one of three colors: white, which
** means the object is not marked; gray, which means the
** object is marked, but its references may be not marked; and
** black, which means that the object and all its references are marked.
** The main invariant of the garbage collector, while marking objects,
** is that a black object can never point to a white one. Moreover,
** any gray object must be in a "gray list" (gray, grayagain, weak,
** allweak, ephemeron) so that it can be visited again before finishing
** the collection cycle. These lists have no meaning when the invariant
** is not being enforced (e.g., sweep phase).
*/
/*
** Possible states of the Garbage Collector
*/
#define GCSpropagate 0
#define GCSenteratomic 1
#define GCSatomic 2
#define GCSswpallgc 3
#define GCSswpfinobj 4
#define GCSswptobefnz 5
#define GCSswpend 6
#define GCScallfin 7
#define GCSpause 8
#define issweepphase(g) \
(GCSswpallgc <= (g)->gcstate && (g)->gcstate <= GCSswpend)
/*
** macro to tell when main invariant (white objects cannot point to black
** ones) must be kept. During a collection, the sweep
** phase may break the invariant, as objects turned white may point to
** still-black objects. The invariant is restored when sweep ends and
** all objects are white again.
*/
#define keepinvariant(g) ((g)->gcstate <= GCSatomic)
/*
** some useful bit tricks
*/
#define resetbits(x,m) ((x) &= cast_byte(~(m)))
#define setbits(x,m) ((x) |= (m))
#define testbits(x,m) ((x) & (m))
#define bitmask(b) (1<<(b))
#define bit2mask(b1,b2) (bitmask(b1) | bitmask(b2))
#define l_setbit(x,b) setbits(x, bitmask(b))
#define resetbit(x,b) resetbits(x, bitmask(b))
#define testbit(x,b) testbits(x, bitmask(b))
/*
** Layout for bit use in 'marked' field. First three bits are
** used for object "age" in generational mode. Last bit is free
** to be used by respective objects.
*/
#define WHITE0BIT 3 /* object is white (type 0) */
#define WHITE1BIT 4 /* object is white (type 1) */
#define BLACKBIT 5 /* object is black */
#define FINALIZEDBIT 6 /* object has been marked for finalization */
#define WHITEBITS bit2mask(WHITE0BIT, WHITE1BIT)
#define iswhite(x) testbits((x)->marked, WHITEBITS)
#define isblack(x) testbit((x)->marked, BLACKBIT)
#define isgray(x) /* neither white nor black */ \
(!testbits((x)->marked, WHITEBITS | bitmask(BLACKBIT)))
#define tofinalize(x) testbit((x)->marked, FINALIZEDBIT)
#define otherwhite(g) ((g)->currentwhite ^ WHITEBITS)
#define isdeadm(ow,m) ((m) & (ow))
#define isdead(g,v) isdeadm(otherwhite(g), (v)->marked)
#define changewhite(x) ((x)->marked ^= WHITEBITS)
#define gray2black(x) l_setbit((x)->marked, BLACKBIT)
#define luaC_white(g) cast_byte((g)->currentwhite & WHITEBITS)
/* object age in generational mode */
#define G_NEW 0 /* created in current cycle */
#define G_SURVIVAL 1 /* created in previous cycle */
#define G_OLD0 2 /* marked old by frw. barrier in this cycle */
#define G_OLD1 3 /* first full cycle as old */
#define G_OLD 4 /* really old object (not to be visited) */
#define G_TOUCHED1 5 /* old object touched this cycle */
#define G_TOUCHED2 6 /* old object touched in previous cycle */
#define AGEBITS 7 /* all age bits (111) */
#define getage(o) ((o)->marked & AGEBITS)
#define setage(o,a) ((o)->marked = cast_byte(((o)->marked & (~AGEBITS)) | a))
#define isold(o) (getage(o) > G_SURVIVAL)
#define changeage(o,f,t) \
check_exp(getage(o) == (f), (o)->marked ^= ((f)^(t)))
/* Default Values for GC parameters */
#define LUAI_GENMAJORMUL 100
#define LUAI_GENMINORMUL 20
/* wait memory to double before starting new cycle */
#define LUAI_GCPAUSE 200
/*
** some gc parameters are stored divided by 4 to allow a maximum value
** up to 1023 in a 'lu_byte'.
*/
#define getgcparam(p) ((p) * 4)
#define setgcparam(p,v) ((p) = (v) / 4)
#define LUAI_GCMUL 100
/* how much to allocate before next GC step (log2) */
#define LUAI_GCSTEPSIZE 13 /* 8 KB */
/*
** Check whether the declared GC mode is generational. While in
** generational mode, the collector can go temporarily to incremental
** mode to improve performance. This is signaled by 'g->lastatomic != 0'.
*/
#define isdecGCmodegen(g) (g->gckind == KGC_GEN || g->lastatomic != 0)
/*
** Does one step of collection when debt becomes positive. 'pre'/'pos'
** allows some adjustments to be done only when needed. macro
** 'condchangemem' is used only for heavy tests (forcing a full
** GC cycle on every opportunity)
*/
#define luaC_condGC(L,pre,pos) \
{ if (G(L)->GCdebt > 0) { pre; luaC_step(L); pos;}; \
condchangemem(L,pre,pos); }
/* more often than not, 'pre'/'pos' are empty */
#define luaC_checkGC(L) luaC_condGC(L,(void)0,(void)0)
#define luaC_barrier(L,p,v) ( \
(iscollectable(v) && isblack(p) && iswhite(gcvalue(v))) ? \
luaC_barrier_(L,obj2gco(p),gcvalue(v)) : cast_void(0))
#define luaC_barrierback(L,p,v) ( \
(iscollectable(v) && isblack(p) && iswhite(gcvalue(v))) ? \
luaC_barrierback_(L,p) : cast_void(0))
#define luaC_objbarrier(L,p,o) ( \
(isblack(p) && iswhite(o)) ? \
luaC_barrier_(L,obj2gco(p),obj2gco(o)) : cast_void(0))
LUAI_FUNC void luaC_fix (lua_State *L, GCObject *o);
LUAI_FUNC void luaC_freeallobjects (lua_State *L);
LUAI_FUNC void luaC_step (lua_State *L);
LUAI_FUNC void luaC_runtilstate (lua_State *L, int statesmask);
LUAI_FUNC void luaC_fullgc (lua_State *L, int isemergency);
LUAI_FUNC GCObject *luaC_newobj (lua_State *L, int tt, size_t sz);
LUAI_FUNC void luaC_barrier_ (lua_State *L, GCObject *o, GCObject *v);
LUAI_FUNC void luaC_barrierback_ (lua_State *L, GCObject *o);
LUAI_FUNC void luaC_checkfinalizer (lua_State *L, GCObject *o, Table *mt);
LUAI_FUNC void luaC_changemode (lua_State *L, int newmode);
#endif
/*
** $Id: lgc.c $
** Garbage Collector
** See Copyright Notice in lua.h
*/
#define lgc_c
#define LUA_CORE
#include "lprefix.h"
#include <stdio.h>
#include <string.h>
#include "lua.h"
#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "lgc.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "ltm.h"
/*
** Maximum number of elements to sweep in each single step.
** (Large enough to dissipate fixed overheads but small enough
** to allow small steps for the collector.)
*/
#define GCSWEEPMAX 100
/*
** Maximum number of finalizers to call in each single step.
*/
#define GCFINMAX 10
/*
** Cost of calling one finalizer.
*/
#define GCFINALIZECOST 50
/*
** The equivalent, in bytes, of one unit of "work" (visiting a slot,
** sweeping an object, etc.)
*/
#define WORK2MEM sizeof(TValue)
/*
** macro to adjust 'pause': 'pause' is actually used like
** 'pause / PAUSEADJ' (value chosen by tests)
*/
#define PAUSEADJ 100
/* mask to erase all color bits (plus gen. related stuff) */
#define maskcolors (~(bitmask(BLACKBIT) | WHITEBITS | AGEBITS))
/* macro to erase all color bits then sets only the current white bit */
#define makewhite(g,x) \
(x->marked = cast_byte((x->marked & maskcolors) | luaC_white(g)))
#define white2gray(x) resetbits(x->marked, WHITEBITS)
#define black2gray(x) resetbit(x->marked, BLACKBIT)
#define valiswhite(x) (iscollectable(x) && iswhite(gcvalue(x)))
#define keyiswhite(n) (keyiscollectable(n) && iswhite(gckey(n)))
#define checkconsistency(obj) \
lua_longassert(!iscollectable(obj) || righttt(obj))
/*
** Protected access to objects in values
*/
#define gcvalueN(o) (iscollectable(o) ? gcvalue(o) : NULL)
#define markvalue(g,o) { checkconsistency(o); \
if (valiswhite(o)) reallymarkobject(g,gcvalue(o)); }
#define markkey(g, n) { if keyiswhite(n) reallymarkobject(g,gckey(n)); }
#define markobject(g,t) { if (iswhite(t)) reallymarkobject(g, obj2gco(t)); }
/*
** mark an object that can be NULL (either because it is really optional,
** or it was stripped as debug info, or inside an uncompleted structure)
*/
#define markobjectN(g,t) { if (t) markobject(g,t); }
static void reallymarkobject (global_State *g, GCObject *o);
static lu_mem atomic (lua_State *L);
static void entersweep (lua_State *L);
/*
** {======================================================
** Generic functions
** =======================================================
*/
/*
** one after last element in a hash array
*/
#define gnodelast(h) gnode(h, cast_sizet(sizenode(h)))
static GCObject **getgclist (GCObject *o) {
switch (o->tt) {
case LUA_VTABLE: return &gco2t(o)->gclist;
case LUA_VLCL: return &gco2lcl(o)->gclist;
case LUA_VCCL: return &gco2ccl(o)->gclist;
case LUA_VTHREAD: return &gco2th(o)->gclist;
case LUA_VPROTO: return &gco2p(o)->gclist;
case LUA_VUSERDATA: {
Udata *u = gco2u(o);
lua_assert(u->nuvalue > 0);
return &u->gclist;
}
default: lua_assert(0); return 0;
}
}
/*
** Link a collectable object 'o' with a known type into list pointed by 'p'.
*/
#define linkgclist(o,p) ((o)->gclist = (p), (p) = obj2gco(o))
/*
** Link a generic collectable object 'o' into list pointed by 'p'.
*/
#define linkobjgclist(o,p) (*getgclist(o) = (p), (p) = obj2gco(o))
/*
** Clear keys for empty entries in tables. If entry is empty
** and its key is not marked, mark its entry as dead. This allows the
** collection of the key, but keeps its entry in the table (its removal
** could break a chain). The main feature of a dead key is that it must
** be different from any other value, to do not disturb searches.
** Other places never manipulate dead keys, because its associated empty
** value is enough to signal that the entry is logically empty.
*/
static void clearkey (Node *n) {
lua_assert(isempty(gval(n)));
if (keyiswhite(n))
setdeadkey(n); /* unused and unmarked key; remove it */
}
/*
** tells whether a key or value can be cleared from a weak
** table. Non-collectable objects are never removed from weak
** tables. Strings behave as 'values', so are never removed too. for
** other objects: if really collected, cannot keep them; for objects
** being finalized, keep them in keys, but not in values
*/
static int iscleared (global_State *g, const GCObject *o) {
if (o == NULL) return 0; /* non-collectable value */
else if (novariant(o->tt) == LUA_TSTRING) {
markobject(g, o); /* strings are 'values', so are never weak */
return 0;
}
else return iswhite(o);
}
/*
** barrier that moves collector forward, that is, mark the white object
** 'v' being pointed by the black object 'o'. (If in sweep phase, clear
** the black object to white [sweep it] to avoid other barrier calls for
** this same object.) In the generational mode, 'v' must also become
** old, if 'o' is old; however, it cannot be changed directly to OLD,
** because it may still point to non-old objects. So, it is marked as
** OLD0. In the next cycle it will become OLD1, and in the next it
** will finally become OLD (regular old).
*/
void luaC_barrier_ (lua_State *L, GCObject *o, GCObject *v) {
global_State *g = G(L);
lua_assert(isblack(o) && iswhite(v) && !isdead(g, v) && !isdead(g, o));
if (keepinvariant(g)) { /* must keep invariant? */
reallymarkobject(g, v); /* restore invariant */
if (isold(o)) {
lua_assert(!isold(v)); /* white object could not be old */
setage(v, G_OLD0); /* restore generational invariant */
}
}
else { /* sweep phase */
lua_assert(issweepphase(g));
makewhite(g, o); /* mark main obj. as white to avoid other barriers */
}
}
/*
** barrier that moves collector backward, that is, mark the black object
** pointing to a white object as gray again.
*/
void luaC_barrierback_ (lua_State *L, GCObject *o) {
global_State *g = G(L);
lua_assert(isblack(o) && !isdead(g, o));
lua_assert(g->gckind != KGC_GEN || (isold(o) && getage(o) != G_TOUCHED1));
if (getage(o) != G_TOUCHED2) /* not already in gray list? */
linkobjgclist(o, g->grayagain); /* link it in 'grayagain' */
black2gray(o); /* make object gray (again) */
setage(o, G_TOUCHED1); /* touched in current cycle */
}
void luaC_fix (lua_State *L, GCObject *o) {
global_State *g = G(L);
lua_assert(g->allgc == o); /* object must be 1st in 'allgc' list! */
white2gray(o); /* they will be gray forever */
setage(o, G_OLD); /* and old forever */
g->allgc = o->next; /* remove object from 'allgc' list */
o->next = g->fixedgc; /* link it to 'fixedgc' list */
g->fixedgc = o;
}
/*
** create a new collectable object (with given type and size) and link
** it to 'allgc' list.
*/
GCObject *luaC_newobj (lua_State *L, int tt, size_t sz) {
global_State *g = G(L);
GCObject *o = cast(GCObject *, luaM_newobject(L, novariant(tt), sz));
o->marked = luaC_white(g);
o->tt = tt;
o->next = g->allgc;
g->allgc = o;
return o;
}
/* }====================================================== */
/*
** {======================================================
** Mark functions
** =======================================================
*/
/*
** Mark an object. Userdata, strings, and closed upvalues are visited
** and turned black here. Other objects are marked gray and added
** to appropriate list to be visited (and turned black) later. (Open
** upvalues are already linked in 'headuv' list. They are kept gray
** to avoid barriers, as their values will be revisited by the thread.)
*/
static void reallymarkobject (global_State *g, GCObject *o) {
white2gray(o);
switch (o->tt) {
case LUA_VSHRSTR:
case LUA_VLNGSTR: {
gray2black(o);
break;
}
case LUA_VUPVAL: {
UpVal *uv = gco2upv(o);
if (!upisopen(uv)) /* open upvalues are kept gray */
gray2black(o);
markvalue(g, uv->v); /* mark its content */
break;
}
case LUA_VUSERDATA: {
Udata *u = gco2u(o);
if (u->nuvalue == 0) { /* no user values? */
markobjectN(g, u->metatable); /* mark its metatable */
gray2black(o); /* nothing else to mark */
break;
}
/* else... */
} /* FALLTHROUGH */
case LUA_VLCL: case LUA_VCCL: case LUA_VTABLE:
case LUA_VTHREAD: case LUA_VPROTO: {
linkobjgclist(o, g->gray);
break;
}
default: lua_assert(0); break;
}
}
/*
** mark metamethods for basic types
*/
static void markmt (global_State *g) {
int i;
for (i=0; i < LUA_NUMTAGS; i++)
markobjectN(g, g->mt[i]);
}
/*
** mark all objects in list of being-finalized
*/
static lu_mem markbeingfnz (global_State *g) {
GCObject *o;
lu_mem count = 0;
for (o = g->tobefnz; o != NULL; o = o->next) {
count++;
markobject(g, o);
}
return count;
}
/*
** Mark all values stored in marked open upvalues from non-marked threads.
** (Values from marked threads were already marked when traversing the
** thread.) Remove from the list threads that no longer have upvalues and
** not-marked threads.
*/
static int remarkupvals (global_State *g) {
lua_State *thread;
lua_State **p = &g->twups;
int work = 0;
while ((thread = *p) != NULL) {
work++;
lua_assert(!isblack(thread)); /* threads are never black */
if (isgray(thread) && thread->openupval != NULL)
p = &thread->twups; /* keep marked thread with upvalues in the list */
else { /* thread is not marked or without upvalues */
UpVal *uv;
*p = thread->twups; /* remove thread from the list */
thread->twups = thread; /* mark that it is out of list */
for (uv = thread->openupval; uv != NULL; uv = uv->u.open.next) {
work++;
if (!iswhite(uv)) /* upvalue already visited? */
markvalue(g, uv->v); /* mark its value */
}
}
}
return work;
}
/*
** mark root set and reset all gray lists, to start a new collection
*/
static void restartcollection (global_State *g) {
g->gray = g->grayagain = NULL;
g->weak = g->allweak = g->ephemeron = NULL;
markobject(g, g->mainthread);
markvalue(g, &g->l_registry);
markmt(g);
markbeingfnz(g); /* mark any finalizing object left from previous cycle */
}
/* }====================================================== */
/*
** {======================================================
** Traverse functions
** =======================================================
*/
/*
** Traverse a table with weak values and link it to proper list. During
** propagate phase, keep it in 'grayagain' list, to be revisited in the
** atomic phase. In the atomic phase, if table has any white value,
** put it in 'weak' list, to be cleared.
*/
static void traverseweakvalue (global_State *g, Table *h) {
Node *n, *limit = gnodelast(h);
/* if there is array part, assume it may have white values (it is not
worth traversing it now just to check) */
int hasclears = (h->alimit > 0);
for (n = gnode(h, 0); n < limit; n++) { /* traverse hash part */
if (isempty(gval(n))) /* entry is empty? */
clearkey(n); /* clear its key */
else {
lua_assert(!keyisnil(n));
markkey(g, n);
if (!hasclears && iscleared(g, gcvalueN(gval(n)))) /* a white value? */
hasclears = 1; /* table will have to be cleared */
}
}
if (g->gcstate == GCSatomic && hasclears)
linkgclist(h, g->weak); /* has to be cleared later */
else
linkgclist(h, g->grayagain); /* must retraverse it in atomic phase */
}
/*
** Traverse an ephemeron table and link it to proper list. Returns true
** iff any object was marked during this traversal (which implies that
** convergence has to continue). During propagation phase, keep table
** in 'grayagain' list, to be visited again in the atomic phase. In
** the atomic phase, if table has any white->white entry, it has to
** be revisited during ephemeron convergence (as that key may turn
** black). Otherwise, if it has any white key, table has to be cleared
** (in the atomic phase). In generational mode, it (like all visited
** tables) must be kept in some gray list for post-processing.
*/
static int traverseephemeron (global_State *g, Table *h, int inv) {
int marked = 0; /* true if an object is marked in this traversal */
int hasclears = 0; /* true if table has white keys */
int hasww = 0; /* true if table has entry "white-key -> white-value" */
unsigned int i;
unsigned int asize = luaH_realasize(h);
unsigned int nsize = sizenode(h);
/* traverse array part */
for (i = 0; i < asize; i++) {
if (valiswhite(&h->array[i])) {
marked = 1;
reallymarkobject(g, gcvalue(&h->array[i]));
}
}
/* traverse hash part; if 'inv', traverse descending
(see 'convergeephemerons') */
for (i = 0; i < nsize; i++) {
Node *n = inv ? gnode(h, nsize - 1 - i) : gnode(h, i);
if (isempty(gval(n))) /* entry is empty? */
clearkey(n); /* clear its key */
else if (iscleared(g, gckeyN(n))) { /* key is not marked (yet)? */
hasclears = 1; /* table must be cleared */
if (valiswhite(gval(n))) /* value not marked yet? */
hasww = 1; /* white-white entry */
}
else if (valiswhite(gval(n))) { /* value not marked yet? */
marked = 1;
reallymarkobject(g, gcvalue(gval(n))); /* mark it now */
}
}
/* link table into proper list */
if (g->gcstate == GCSpropagate)
linkgclist(h, g->grayagain); /* must retraverse it in atomic phase */
else if (hasww) /* table has white->white entries? */
linkgclist(h, g->ephemeron); /* have to propagate again */
else if (hasclears) /* table has white keys? */
linkgclist(h, g->allweak); /* may have to clean white keys */
else if (g->gckind == KGC_GEN)
linkgclist(h, g->grayagain); /* keep it in some list */
else
gray2black(h);
return marked;
}
static void traversestrongtable (global_State *g, Table *h) {
Node *n, *limit = gnodelast(h);
unsigned int i;
unsigned int asize = luaH_realasize(h);
for (i = 0; i < asize; i++) /* traverse array part */
markvalue(g, &h->array[i]);
for (n = gnode(h, 0); n < limit; n++) { /* traverse hash part */
if (isempty(gval(n))) /* entry is empty? */
clearkey(n); /* clear its key */
else {
lua_assert(!keyisnil(n));
markkey(g, n);
markvalue(g, gval(n));
}
}
if (g->gckind == KGC_GEN) {
linkgclist(h, g->grayagain); /* keep it in some gray list */
black2gray(h);
}
}
static lu_mem traversetable (global_State *g, Table *h) {
const char *weakkey, *weakvalue;
const TValue *mode = gfasttm(g, h->metatable, TM_MODE);
markobjectN(g, h->metatable);
if (mode && ttisstring(mode) && /* is there a weak mode? */
(cast_void(weakkey = strchr(svalue(mode), 'k')),
cast_void(weakvalue = strchr(svalue(mode), 'v')),
(weakkey || weakvalue))) { /* is really weak? */
black2gray(h); /* keep table gray */
if (!weakkey) /* strong keys? */
traverseweakvalue(g, h);
else if (!weakvalue) /* strong values? */
traverseephemeron(g, h, 0);
else /* all weak */
linkgclist(h, g->allweak); /* nothing to traverse now */
}
else /* not weak */
traversestrongtable(g, h);
return 1 + h->alimit + 2 * allocsizenode(h);
}
static int traverseudata (global_State *g, Udata *u) {
int i;
markobjectN(g, u->metatable); /* mark its metatable */
for (i = 0; i < u->nuvalue; i++)
markvalue(g, &u->uv[i].uv);
if (g->gckind == KGC_GEN) {
linkgclist(u, g->grayagain); /* keep it in some gray list */
black2gray(u);
}
return 1 + u->nuvalue;
}
/*
** Traverse a prototype. (While a prototype is being build, its
** arrays can be larger than needed; the extra slots are filled with
** NULL, so the use of 'markobjectN')
*/
static int traverseproto (global_State *g, Proto *f) {
int i;
markobjectN(g, f->source);
for (i = 0; i < f->sizek; i++) /* mark literals */
markvalue(g, &f->k[i]);
for (i = 0; i < f->sizeupvalues; i++) /* mark upvalue names */
markobjectN(g, f->upvalues[i].name);
for (i = 0; i < f->sizep; i++) /* mark nested protos */
markobjectN(g, f->p[i]);
for (i = 0; i < f->sizelocvars; i++) /* mark local-variable names */
markobjectN(g, f->locvars[i].varname);
return 1 + f->sizek + f->sizeupvalues + f->sizep + f->sizelocvars;
}
static int traverseCclosure (global_State *g, CClosure *cl) {
int i;
for (i = 0; i < cl->nupvalues; i++) /* mark its upvalues */
markvalue(g, &cl->upvalue[i]);
return 1 + cl->nupvalues;
}
/*
** Traverse a Lua closure, marking its prototype and its upvalues.
** (Both can be NULL while closure is being created.)
*/
static int traverseLclosure (global_State *g, LClosure *cl) {
int i;
markobjectN(g, cl->p); /* mark its prototype */
for (i = 0; i < cl->nupvalues; i++) { /* visit its upvalues */
UpVal *uv = cl->upvals[i];
markobjectN(g, uv); /* mark upvalue */
}
return 1 + cl->nupvalues;
}
/*
** Traverse a thread, marking the elements in the stack up to its top
** and cleaning the rest of the stack in the final traversal.
** That ensures that the entire stack have valid (non-dead) objects.
*/
static int traversethread (global_State *g, lua_State *th) {
UpVal *uv;
StkId o = th->stack;
if (o == NULL)
return 1; /* stack not completely built yet */
lua_assert(g->gcstate == GCSatomic ||
th->openupval == NULL || isintwups(th));
for (; o < th->top; o++) /* mark live elements in the stack */
markvalue(g, s2v(o));
for (uv = th->openupval; uv != NULL; uv = uv->u.open.next)
markobject(g, uv); /* open upvalues cannot be collected */
if (g->gcstate == GCSatomic) { /* final traversal? */
StkId lim = th->stack + th->stacksize; /* real end of stack */
for (; o < lim; o++) /* clear not-marked stack slice */
setnilvalue(s2v(o));
/* 'remarkupvals' may have removed thread from 'twups' list */
if (!isintwups(th) && th->openupval != NULL) {
th->twups = g->twups; /* link it back to the list */
g->twups = th;
}
}
else if (!g->gcemergency)
luaD_shrinkstack(th); /* do not change stack in emergency cycle */
return 1 + th->stacksize;
}
/*
** traverse one gray object, turning it to black (except for threads,
** which are always gray).
*/
static lu_mem propagatemark (global_State *g) {
GCObject *o = g->gray;
gray2black(o);
g->gray = *getgclist(o); /* remove from 'gray' list */
switch (o->tt) {
case LUA_VTABLE: return traversetable(g, gco2t(o));
case LUA_VUSERDATA: return traverseudata(g, gco2u(o));
case LUA_VLCL: return traverseLclosure(g, gco2lcl(o));
case LUA_VCCL: return traverseCclosure(g, gco2ccl(o));
case LUA_VPROTO: return traverseproto(g, gco2p(o));
case LUA_VTHREAD: {
lua_State *th = gco2th(o);
linkgclist(th, g->grayagain); /* insert into 'grayagain' list */
black2gray(o);
return traversethread(g, th);
}
default: lua_assert(0); return 0;
}
}
static lu_mem propagateall (global_State *g) {
lu_mem tot = 0;
while (g->gray)
tot += propagatemark(g);
return tot;
}
/*
** Traverse all ephemeron tables propagating marks from keys to values.
** Repeat until it converges, that is, nothing new is marked. 'dir'
** inverts the direction of the traversals, trying to speed up
** convergence on chains in the same table.
**
*/
static void convergeephemerons (global_State *g) {
int changed;
int dir = 0;
do {
GCObject *w;
GCObject *next = g->ephemeron; /* get ephemeron list */
g->ephemeron = NULL; /* tables may return to this list when traversed */
changed = 0;
while ((w = next) != NULL) { /* for each ephemeron table */
next = gco2t(w)->gclist; /* list is rebuilt during loop */
if (traverseephemeron(g, gco2t(w), dir)) { /* marked some value? */
propagateall(g); /* propagate changes */
changed = 1; /* will have to revisit all ephemeron tables */
}
}
dir = !dir; /* invert direction next time */
} while (changed); /* repeat until no more changes */
}
/* }====================================================== */
/*
** {======================================================
** Sweep Functions
** =======================================================
*/
/*
** clear entries with unmarked keys from all weaktables in list 'l'
*/
static void clearbykeys (global_State *g, GCObject *l) {
for (; l; l = gco2t(l)->gclist) {
Table *h = gco2t(l);
Node *limit = gnodelast(h);
Node *n;
for (n = gnode(h, 0); n < limit; n++) {
if (iscleared(g, gckeyN(n))) /* unmarked key? */
setempty(gval(n)); /* remove entry */
if (isempty(gval(n))) /* is entry empty? */
clearkey(n); /* clear its key */
}
}
}
/*
** clear entries with unmarked values from all weaktables in list 'l' up
** to element 'f'
*/
static void clearbyvalues (global_State *g, GCObject *l, GCObject *f) {
for (; l != f; l = gco2t(l)->gclist) {
Table *h = gco2t(l);
Node *n, *limit = gnodelast(h);
unsigned int i;
unsigned int asize = luaH_realasize(h);
for (i = 0; i < asize; i++) {
TValue *o = &h->array[i];
if (iscleared(g, gcvalueN(o))) /* value was collected? */
setempty(o); /* remove entry */
}
for (n = gnode(h, 0); n < limit; n++) {
if (iscleared(g, gcvalueN(gval(n)))) /* unmarked value? */
setempty(gval(n)); /* remove entry */
if (isempty(gval(n))) /* is entry empty? */
clearkey(n); /* clear its key */
}
}
}
static void freeupval (lua_State *L, UpVal *uv) {
if (upisopen(uv))
luaF_unlinkupval(uv);
luaM_free(L, uv);
}
static void freeobj (lua_State *L, GCObject *o) {
switch (o->tt) {
case LUA_VPROTO:
luaF_freeproto(L, gco2p(o));
break;
case LUA_VUPVAL:
freeupval(L, gco2upv(o));
break;
case LUA_VLCL:
luaM_freemem(L, o, sizeLclosure(gco2lcl(o)->nupvalues));
break;
case LUA_VCCL:
luaM_freemem(L, o, sizeCclosure(gco2ccl(o)->nupvalues));
break;
case LUA_VTABLE:
luaH_free(L, gco2t(o));
break;
case LUA_VTHREAD:
luaE_freethread(L, gco2th(o));
break;
case LUA_VUSERDATA: {
Udata *u = gco2u(o);
luaM_freemem(L, o, sizeudata(u->nuvalue, u->len));
break;
}
case LUA_VSHRSTR:
luaS_remove(L, gco2ts(o)); /* remove it from hash table */
luaM_freemem(L, o, sizelstring(gco2ts(o)->shrlen));
break;
case LUA_VLNGSTR:
luaM_freemem(L, o, sizelstring(gco2ts(o)->u.lnglen));
break;
default: lua_assert(0);
}
}
/*
** sweep at most 'countin' elements from a list of GCObjects erasing dead
** objects, where a dead object is one marked with the old (non current)
** white; change all non-dead objects back to white, preparing for next
** collection cycle. Return where to continue the traversal or NULL if
** list is finished. ('*countout' gets the number of elements traversed.)
*/
static GCObject **sweeplist (lua_State *L, GCObject **p, int countin,
int *countout) {
global_State *g = G(L);
int ow = otherwhite(g);
int i;
int white = luaC_white(g); /* current white */
for (i = 0; *p != NULL && i < countin; i++) {
GCObject *curr = *p;
int marked = curr->marked;
if (isdeadm(ow, marked)) { /* is 'curr' dead? */
*p = curr->next; /* remove 'curr' from list */
freeobj(L, curr); /* erase 'curr' */
}
else { /* change mark to 'white' */
curr->marked = cast_byte((marked & maskcolors) | white);
p = &curr->next; /* go to next element */
}
}
if (countout)
*countout = i; /* number of elements traversed */
return (*p == NULL) ? NULL : p;
}
/*
** sweep a list until a live object (or end of list)
*/
static GCObject **sweeptolive (lua_State *L, GCObject **p) {
GCObject **old = p;
do {
p = sweeplist(L, p, 1, NULL);
} while (p == old);
return p;
}
/* }====================================================== */
/*
** {======================================================
** Finalization
** =======================================================
*/
/*
** If possible, shrink string table.
*/
static void checkSizes (lua_State *L, global_State *g) {
if (!g->gcemergency) {
if (g->strt.nuse < g->strt.size / 4) { /* string table too big? */
l_mem olddebt = g->GCdebt;
luaS_resize(L, g->strt.size / 2);
g->GCestimate += g->GCdebt - olddebt; /* correct estimate */
}
}
}
/*
** Get the next udata to be finalized from the 'tobefnz' list, and
** link it back into the 'allgc' list.
*/
static GCObject *udata2finalize (global_State *g) {
GCObject *o = g->tobefnz; /* get first element */
lua_assert(tofinalize(o));
g->tobefnz = o->next; /* remove it from 'tobefnz' list */
o->next = g->allgc; /* return it to 'allgc' list */
g->allgc = o;
resetbit(o->marked, FINALIZEDBIT); /* object is "normal" again */
if (issweepphase(g))
makewhite(g, o); /* "sweep" object */
return o;
}
static void dothecall (lua_State *L, void *ud) {
UNUSED(ud);
luaD_callnoyield(L, L->top - 2, 0);
}
static void GCTM (lua_State *L) {
global_State *g = G(L);
const TValue *tm;
TValue v;
lua_assert(!g->gcemergency);
setgcovalue(L, &v, udata2finalize(g));
tm = luaT_gettmbyobj(L, &v, TM_GC);
if (!notm(tm)) { /* is there a finalizer? */
int status;
lu_byte oldah = L->allowhook;
int running = g->gcrunning;
L->allowhook = 0; /* stop debug hooks during GC metamethod */
g->gcrunning = 0; /* avoid GC steps */
setobj2s(L, L->top++, tm); /* push finalizer... */
setobj2s(L, L->top++, &v); /* ... and its argument */
L->ci->callstatus |= CIST_FIN; /* will run a finalizer */
status = luaD_pcall(L, dothecall, NULL, savestack(L, L->top - 2), 0);
L->ci->callstatus &= ~CIST_FIN; /* not running a finalizer anymore */
L->allowhook = oldah; /* restore hooks */
g->gcrunning = running; /* restore state */
if (unlikely(status != LUA_OK)) { /* error while running __gc? */
luaE_warnerror(L, "__gc metamethod");
L->top--; /* pops error object */
}
}
}
/*
** Call a few finalizers
*/
static int runafewfinalizers (lua_State *L, int n) {
global_State *g = G(L);
int i;
for (i = 0; i < n && g->tobefnz; i++)
GCTM(L); /* call one finalizer */
return i;
}
/*
** call all pending finalizers
*/
static void callallpendingfinalizers (lua_State *L) {
global_State *g = G(L);
while (g->tobefnz)
GCTM(L);
}
/*
** find last 'next' field in list 'p' list (to add elements in its end)
*/
static GCObject **findlast (GCObject **p) {
while (*p != NULL)
p = &(*p)->next;
return p;
}
/*
** Move all unreachable objects (or 'all' objects) that need
** finalization from list 'finobj' to list 'tobefnz' (to be finalized).
** (Note that objects after 'finobjold' cannot be white, so they
** don't need to be traversed. In incremental mode, 'finobjold' is NULL,
** so the whole list is traversed.)
*/
static void separatetobefnz (global_State *g, int all) {
GCObject *curr;
GCObject **p = &g->finobj;
GCObject **lastnext = findlast(&g->tobefnz);
while ((curr = *p) != g->finobjold) { /* traverse all finalizable objects */
lua_assert(tofinalize(curr));
if (!(iswhite(curr) || all)) /* not being collected? */
p = &curr->next; /* don't bother with it */
else {
if (curr == g->finobjsur) /* removing 'finobjsur'? */
g->finobjsur = curr->next; /* correct it */
*p = curr->next; /* remove 'curr' from 'finobj' list */
curr->next = *lastnext; /* link at the end of 'tobefnz' list */
*lastnext = curr;
lastnext = &curr->next;
}
}
}
/*
** if object 'o' has a finalizer, remove it from 'allgc' list (must
** search the list to find it) and link it in 'finobj' list.
*/
void luaC_checkfinalizer (lua_State *L, GCObject *o, Table *mt) {
global_State *g = G(L);
if (tofinalize(o) || /* obj. is already marked... */
gfasttm(g, mt, TM_GC) == NULL) /* or has no finalizer? */
return; /* nothing to be done */
else { /* move 'o' to 'finobj' list */
GCObject **p;
if (issweepphase(g)) {
makewhite(g, o); /* "sweep" object 'o' */
if (g->sweepgc == &o->next) /* should not remove 'sweepgc' object */
g->sweepgc = sweeptolive(L, g->sweepgc); /* change 'sweepgc' */
}
else { /* correct pointers into 'allgc' list, if needed */
if (o == g->survival)
g->survival = o->next;
if (o == g->old)
g->old = o->next;
if (o == g->reallyold)
g->reallyold = o->next;
}
/* search for pointer pointing to 'o' */
for (p = &g->allgc; *p != o; p = &(*p)->next) { /* empty */ }
*p = o->next; /* remove 'o' from 'allgc' list */
o->next = g->finobj; /* link it in 'finobj' list */
g->finobj = o;
l_setbit(o->marked, FINALIZEDBIT); /* mark it as such */
}
}
/* }====================================================== */
/*
** {======================================================
** Generational Collector
** =======================================================
*/
static void setpause (global_State *g);
/* mask to erase all color bits, not changing gen-related stuff */
#define maskgencolors (~(bitmask(BLACKBIT) | WHITEBITS))
/*
** Sweep a list of objects, deleting dead ones and turning
** the non dead to old (without changing their colors).
*/
static void sweep2old (lua_State *L, GCObject **p) {
GCObject *curr;
while ((curr = *p) != NULL) {
if (iswhite(curr)) { /* is 'curr' dead? */
lua_assert(isdead(G(L), curr));
*p = curr->next; /* remove 'curr' from list */
freeobj(L, curr); /* erase 'curr' */
}
else { /* all surviving objects become old */
setage(curr, G_OLD);
p = &curr->next; /* go to next element */
}
}
}
/*
** Sweep for generational mode. Delete dead objects. (Because the
** collection is not incremental, there are no "new white" objects
** during the sweep. So, any white object must be dead.) For
** non-dead objects, advance their ages and clear the color of
** new objects. (Old objects keep their colors.)
*/
static GCObject **sweepgen (lua_State *L, global_State *g, GCObject **p,
GCObject *limit) {
static const lu_byte nextage[] = {
G_SURVIVAL, /* from G_NEW */
G_OLD1, /* from G_SURVIVAL */
G_OLD1, /* from G_OLD0 */
G_OLD, /* from G_OLD1 */
G_OLD, /* from G_OLD (do not change) */
G_TOUCHED1, /* from G_TOUCHED1 (do not change) */
G_TOUCHED2 /* from G_TOUCHED2 (do not change) */
};
int white = luaC_white(g);
GCObject *curr;
while ((curr = *p) != limit) {
if (iswhite(curr)) { /* is 'curr' dead? */
lua_assert(!isold(curr) && isdead(g, curr));
*p = curr->next; /* remove 'curr' from list */
freeobj(L, curr); /* erase 'curr' */
}
else { /* correct mark and age */
if (getage(curr) == G_NEW)
curr->marked = cast_byte((curr->marked & maskgencolors) | white);
setage(curr, nextage[getage(curr)]);
p = &curr->next; /* go to next element */
}
}
return p;
}
/*
** Traverse a list making all its elements white and clearing their
** age.
*/
static void whitelist (global_State *g, GCObject *p) {
int white = luaC_white(g);
for (; p != NULL; p = p->next)
p->marked = cast_byte((p->marked & maskcolors) | white);
}
/*
** Correct a list of gray objects.
** Because this correction is done after sweeping, young objects might
** be turned white and still be in the list. They are only removed.
** For tables and userdata, advance 'touched1' to 'touched2'; 'touched2'
** objects become regular old and are removed from the list.
** For threads, just remove white ones from the list.
*/
static GCObject **correctgraylist (GCObject **p) {
GCObject *curr;
while ((curr = *p) != NULL) {
switch (curr->tt) {
case LUA_VTABLE: case LUA_VUSERDATA: {
GCObject **next = getgclist(curr);
if (getage(curr) == G_TOUCHED1) { /* touched in this cycle? */
lua_assert(isgray(curr));
gray2black(curr); /* make it black, for next barrier */
changeage(curr, G_TOUCHED1, G_TOUCHED2);
p = next; /* go to next element */
}
else { /* not touched in this cycle */
if (!iswhite(curr)) { /* not white? */
lua_assert(isold(curr));
if (getage(curr) == G_TOUCHED2) /* advance from G_TOUCHED2... */
changeage(curr, G_TOUCHED2, G_OLD); /* ... to G_OLD */
gray2black(curr); /* make it black */
}
/* else, object is white: just remove it from this list */
*p = *next; /* remove 'curr' from gray list */
}
break;
}
case LUA_VTHREAD: {
lua_State *th = gco2th(curr);
lua_assert(!isblack(th));
if (iswhite(th)) /* new object? */
*p = th->gclist; /* remove from gray list */
else /* old threads remain gray */
p = &th->gclist; /* go to next element */
break;
}
default: lua_assert(0); /* nothing more could be gray here */
}
}
return p;
}
/*
** Correct all gray lists, coalescing them into 'grayagain'.
*/
static void correctgraylists (global_State *g) {
GCObject **list = correctgraylist(&g->grayagain);
*list = g->weak; g->weak = NULL;
list = correctgraylist(list);
*list = g->allweak; g->allweak = NULL;
list = correctgraylist(list);
*list = g->ephemeron; g->ephemeron = NULL;
correctgraylist(list);
}
/*
** Mark 'OLD1' objects when starting a new young collection.
** Gray objects are already in some gray list, and so will be visited
** in the atomic step.
*/
static void markold (global_State *g, GCObject *from, GCObject *to) {
GCObject *p;
for (p = from; p != to; p = p->next) {
if (getage(p) == G_OLD1) {
lua_assert(!iswhite(p));
if (isblack(p)) {
black2gray(p); /* should be '2white', but gray works too */
reallymarkobject(g, p);
}
}
}
}
/*
** Finish a young-generation collection.
*/
static void finishgencycle (lua_State *L, global_State *g) {
correctgraylists(g);
checkSizes(L, g);
g->gcstate = GCSpropagate; /* skip restart */
if (!g->gcemergency)
callallpendingfinalizers(L);
}
/*
** Does a young collection. First, mark 'OLD1' objects. (Only survival
** and "recent old" lists can contain 'OLD1' objects. New lists cannot
** contain 'OLD1' objects, at most 'OLD0' objects that were already
** visited when marked old.) Then does the atomic step. Then,
** sweep all lists and advance pointers. Finally, finish the collection.
*/
static void youngcollection (lua_State *L, global_State *g) {
GCObject **psurvival; /* to point to first non-dead survival object */
lua_assert(g->gcstate == GCSpropagate);
markold(g, g->survival, g->reallyold);
markold(g, g->finobj, g->finobjrold);
atomic(L);
/* sweep nursery and get a pointer to its last live element */
psurvival = sweepgen(L, g, &g->allgc, g->survival);
/* sweep 'survival' and 'old' */
sweepgen(L, g, psurvival, g->reallyold);
g->reallyold = g->old;
g->old = *psurvival; /* 'survival' survivals are old now */
g->survival = g->allgc; /* all news are survivals */
/* repeat for 'finobj' lists */
psurvival = sweepgen(L, g, &g->finobj, g->finobjsur);
/* sweep 'survival' and 'old' */
sweepgen(L, g, psurvival, g->finobjrold);
g->finobjrold = g->finobjold;
g->finobjold = *psurvival; /* 'survival' survivals are old now */
g->finobjsur = g->finobj; /* all news are survivals */
sweepgen(L, g, &g->tobefnz, NULL);
finishgencycle(L, g);
}
static void atomic2gen (lua_State *L, global_State *g) {
/* sweep all elements making them old */
sweep2old(L, &g->allgc);
/* everything alive now is old */
g->reallyold = g->old = g->survival = g->allgc;
/* repeat for 'finobj' lists */
sweep2old(L, &g->finobj);
g->finobjrold = g->finobjold = g->finobjsur = g->finobj;
sweep2old(L, &g->tobefnz);
g->gckind = KGC_GEN;
g->lastatomic = 0;
g->GCestimate = gettotalbytes(g); /* base for memory control */
finishgencycle(L, g);
}
/*
** Enter generational mode. Must go until the end of an atomic cycle
** to ensure that all threads and weak tables are in the gray lists.
** Then, turn all objects into old and finishes the collection.
*/
static lu_mem entergen (lua_State *L, global_State *g) {
lu_mem numobjs;
luaC_runtilstate(L, bitmask(GCSpause)); /* prepare to start a new cycle */
luaC_runtilstate(L, bitmask(GCSpropagate)); /* start new cycle */
numobjs = atomic(L); /* propagates all and then do the atomic stuff */
atomic2gen(L, g);
return numobjs;
}
/*
** Enter incremental mode. Turn all objects white, make all
** intermediate lists point to NULL (to avoid invalid pointers),
** and go to the pause state.
*/
static void enterinc (global_State *g) {
whitelist(g, g->allgc);
g->reallyold = g->old = g->survival = NULL;
whitelist(g, g->finobj);
whitelist(g, g->tobefnz);
g->finobjrold = g->finobjold = g->finobjsur = NULL;
g->gcstate = GCSpause;
g->gckind = KGC_INC;
g->lastatomic = 0;
}
/*
** Change collector mode to 'newmode'.
*/
void luaC_changemode (lua_State *L, int newmode) {
global_State *g = G(L);
if (newmode != g->gckind) {
if (newmode == KGC_GEN) /* entering generational mode? */
entergen(L, g);
else
enterinc(g); /* entering incremental mode */
}
g->lastatomic = 0;
}
/*
** Does a full collection in generational mode.
*/
static lu_mem fullgen (lua_State *L, global_State *g) {
enterinc(g);
return entergen(L, g);
}
/*
** Set debt for the next minor collection, which will happen when
** memory grows 'genminormul'%.
*/
static void setminordebt (global_State *g) {
luaE_setdebt(g, -(cast(l_mem, (gettotalbytes(g) / 100)) * g->genminormul));
}
/*
** Does a major collection after last collection was a "bad collection".
**
** When the program is building a big structure, it allocates lots of
** memory but generates very little garbage. In those scenarios,
** the generational mode just wastes time doing small collections, and
** major collections are frequently what we call a "bad collection", a
** collection that frees too few objects. To avoid the cost of switching
** between generational mode and the incremental mode needed for full
** (major) collections, the collector tries to stay in incremental mode
** after a bad collection, and to switch back to generational mode only
** after a "good" collection (one that traverses less than 9/8 objects
** of the previous one).
** The collector must choose whether to stay in incremental mode or to
** switch back to generational mode before sweeping. At this point, it
** does not know the real memory in use, so it cannot use memory to
** decide whether to return to generational mode. Instead, it uses the
** number of objects traversed (returned by 'atomic') as a proxy. The
** field 'g->lastatomic' keeps this count from the last collection.
** ('g->lastatomic != 0' also means that the last collection was bad.)
*/
static void stepgenfull (lua_State *L, global_State *g) {
lu_mem newatomic; /* count of traversed objects */
lu_mem lastatomic = g->lastatomic; /* count from last collection */
if (g->gckind == KGC_GEN) /* still in generational mode? */
enterinc(g); /* enter incremental mode */
luaC_runtilstate(L, bitmask(GCSpropagate)); /* start new cycle */
newatomic = atomic(L); /* mark everybody */
if (newatomic < lastatomic + (lastatomic >> 3)) { /* good collection? */
atomic2gen(L, g); /* return to generational mode */
setminordebt(g);
}
else { /* another bad collection; stay in incremental mode */
g->GCestimate = gettotalbytes(g); /* first estimate */;
entersweep(L);
luaC_runtilstate(L, bitmask(GCSpause)); /* finish collection */
setpause(g);
g->lastatomic = newatomic;
}
}
/*
** Does a generational "step".
** Usually, this means doing a minor collection and setting the debt to
** make another collection when memory grows 'genminormul'% larger.
**
** However, there are exceptions. If memory grows 'genmajormul'%
** larger than it was at the end of the last major collection (kept
** in 'g->GCestimate'), the function does a major collection. At the
** end, it checks whether the major collection was able to free a
** decent amount of memory (at least half the growth in memory since
** previous major collection). If so, the collector keeps its state,
** and the next collection will probably be minor again. Otherwise,
** we have what we call a "bad collection". In that case, set the field
** 'g->lastatomic' to signal that fact, so that the next collection will
** go to 'stepgenfull'.
**
** 'GCdebt <= 0' means an explicit call to GC step with "size" zero;
** in that case, do a minor collection.
*/
static void genstep (lua_State *L, global_State *g) {
if (g->lastatomic != 0) /* last collection was a bad one? */
stepgenfull(L, g); /* do a full step */
else {
lu_mem majorbase = g->GCestimate; /* memory after last major collection */
lu_mem majorinc = (majorbase / 100) * getgcparam(g->genmajormul);
if (g->GCdebt > 0 && gettotalbytes(g) > majorbase + majorinc) {
lu_mem numobjs = fullgen(L, g); /* do a major collection */
if (gettotalbytes(g) < majorbase + (majorinc / 2)) {
/* collected at least half of memory growth since last major
collection; keep doing minor collections */
setminordebt(g);
}
else { /* bad collection */
g->lastatomic = numobjs; /* signal that last collection was bad */
setpause(g); /* do a long wait for next (major) collection */
}
}
else { /* regular case; do a minor collection */
youngcollection(L, g);
setminordebt(g);
g->GCestimate = majorbase; /* preserve base value */
}
}
lua_assert(isdecGCmodegen(g));
}
/* }====================================================== */
/*
** {======================================================
** GC control
** =======================================================
*/
/*
** Set the "time" to wait before starting a new GC cycle; cycle will
** start when memory use hits the threshold of ('estimate' * pause /
** PAUSEADJ). (Division by 'estimate' should be OK: it cannot be zero,
** because Lua cannot even start with less than PAUSEADJ bytes).
*/
static void setpause (global_State *g) {
l_mem threshold, debt;
int pause = getgcparam(g->gcpause);
l_mem estimate = g->GCestimate / PAUSEADJ; /* adjust 'estimate' */
lua_assert(estimate > 0);
threshold = (pause < MAX_LMEM / estimate) /* overflow? */
? estimate * pause /* no overflow */
: MAX_LMEM; /* overflow; truncate to maximum */
debt = gettotalbytes(g) - threshold;
if (debt > 0) debt = 0;
luaE_setdebt(g, debt);
}
/*
** Enter first sweep phase.
** The call to 'sweeptolive' makes the pointer point to an object
** inside the list (instead of to the header), so that the real sweep do
** not need to skip objects created between "now" and the start of the
** real sweep.
*/
static void entersweep (lua_State *L) {
global_State *g = G(L);
g->gcstate = GCSswpallgc;
lua_assert(g->sweepgc == NULL);
g->sweepgc = sweeptolive(L, &g->allgc);
}
/*
** Delete all objects in list 'p' until (but not including) object
** 'limit'.
*/
static void deletelist (lua_State *L, GCObject *p, GCObject *limit) {
while (p != limit) {
GCObject *next = p->next;
freeobj(L, p);
p = next;
}
}
/*
** Call all finalizers of the objects in the given Lua state, and
** then free all objects, except for the main thread.
*/
void luaC_freeallobjects (lua_State *L) {
global_State *g = G(L);
luaC_changemode(L, KGC_INC);
separatetobefnz(g, 1); /* separate all objects with finalizers */
lua_assert(g->finobj == NULL);
callallpendingfinalizers(L);
deletelist(L, g->allgc, obj2gco(g->mainthread));
deletelist(L, g->finobj, NULL);
deletelist(L, g->fixedgc, NULL); /* collect fixed objects */
lua_assert(g->strt.nuse == 0);
}
static lu_mem atomic (lua_State *L) {
global_State *g = G(L);
lu_mem work = 0;
GCObject *origweak, *origall;
GCObject *grayagain = g->grayagain; /* save original list */
g->grayagain = NULL;
lua_assert(g->ephemeron == NULL && g->weak == NULL);
lua_assert(!iswhite(g->mainthread));
g->gcstate = GCSatomic;
markobject(g, L); /* mark running thread */
/* registry and global metatables may be changed by API */
markvalue(g, &g->l_registry);
markmt(g); /* mark global metatables */
work += propagateall(g); /* empties 'gray' list */
/* remark occasional upvalues of (maybe) dead threads */
work += remarkupvals(g);
work += propagateall(g); /* propagate changes */
g->gray = grayagain;
work += propagateall(g); /* traverse 'grayagain' list */
convergeephemerons(g);
/* at this point, all strongly accessible objects are marked. */
/* Clear values from weak tables, before checking finalizers */
clearbyvalues(g, g->weak, NULL);
clearbyvalues(g, g->allweak, NULL);
origweak = g->weak; origall = g->allweak;
separatetobefnz(g, 0); /* separate objects to be finalized */
work += markbeingfnz(g); /* mark objects that will be finalized */
work += propagateall(g); /* remark, to propagate 'resurrection' */
convergeephemerons(g);
/* at this point, all resurrected objects are marked. */
/* remove dead objects from weak tables */
clearbykeys(g, g->ephemeron); /* clear keys from all ephemeron tables */
clearbykeys(g, g->allweak); /* clear keys from all 'allweak' tables */
/* clear values from resurrected weak tables */
clearbyvalues(g, g->weak, origweak);
clearbyvalues(g, g->allweak, origall);
luaS_clearcache(g);
g->currentwhite = cast_byte(otherwhite(g)); /* flip current white */
lua_assert(g->gray == NULL);
return work; /* estimate of slots marked by 'atomic' */
}
static int sweepstep (lua_State *L, global_State *g,
int nextstate, GCObject **nextlist) {
if (g->sweepgc) {
l_mem olddebt = g->GCdebt;
int count;
g->sweepgc = sweeplist(L, g->sweepgc, GCSWEEPMAX, &count);
g->GCestimate += g->GCdebt - olddebt; /* update estimate */
return count;
}
else { /* enter next state */
g->gcstate = nextstate;
g->sweepgc = nextlist;
return 0; /* no work done */
}
}
static lu_mem singlestep (lua_State *L) {
global_State *g = G(L);
switch (g->gcstate) {
case GCSpause: {
restartcollection(g);
g->gcstate = GCSpropagate;
return 1;
}
case GCSpropagate: {
if (g->gray == NULL) { /* no more gray objects? */
g->gcstate = GCSenteratomic; /* finish propagate phase */
return 0;
}
else
return propagatemark(g); /* traverse one gray object */
}
case GCSenteratomic: {
lu_mem work = atomic(L); /* work is what was traversed by 'atomic' */
entersweep(L);
g->GCestimate = gettotalbytes(g); /* first estimate */;
return work;
}
case GCSswpallgc: { /* sweep "regular" objects */
return sweepstep(L, g, GCSswpfinobj, &g->finobj);
}
case GCSswpfinobj: { /* sweep objects with finalizers */
return sweepstep(L, g, GCSswptobefnz, &g->tobefnz);
}
case GCSswptobefnz: { /* sweep objects to be finalized */
return sweepstep(L, g, GCSswpend, NULL);
}
case GCSswpend: { /* finish sweeps */
checkSizes(L, g);
g->gcstate = GCScallfin;
return 0;
}
case GCScallfin: { /* call remaining finalizers */
if (g->tobefnz && !g->gcemergency) {
int n = runafewfinalizers(L, GCFINMAX);
return n * GCFINALIZECOST;
}
else { /* emergency mode or no more finalizers */
g->gcstate = GCSpause; /* finish collection */
return 0;
}
}
default: lua_assert(0); return 0;
}
}
/*
** advances the garbage collector until it reaches a state allowed
** by 'statemask'
*/
void luaC_runtilstate (lua_State *L, int statesmask) {
global_State *g = G(L);
while (!testbit(statesmask, g->gcstate))
singlestep(L);
}
/*
** Performs a basic incremental step. The debt and step size are
** converted from bytes to "units of work"; then the function loops
** running single steps until adding that many units of work or
** finishing a cycle (pause state). Finally, it sets the debt that
** controls when next step will be performed.
*/
static void incstep (lua_State *L, global_State *g) {
int stepmul = (getgcparam(g->gcstepmul) | 1); /* avoid division by 0 */
l_mem debt = (g->GCdebt / WORK2MEM) * stepmul;
l_mem stepsize = (g->gcstepsize <= log2maxs(l_mem))
? ((cast(l_mem, 1) << g->gcstepsize) / WORK2MEM) * stepmul
: MAX_LMEM; /* overflow; keep maximum value */
do { /* repeat until pause or enough "credit" (negative debt) */
lu_mem work = singlestep(L); /* perform one single step */
debt -= work;
} while (debt > -stepsize && g->gcstate != GCSpause);
if (g->gcstate == GCSpause)
setpause(g); /* pause until next cycle */
else {
debt = (debt / stepmul) * WORK2MEM; /* convert 'work units' to bytes */
luaE_setdebt(g, debt);
}
}
/*
** performs a basic GC step if collector is running
*/
void luaC_step (lua_State *L) {
global_State *g = G(L);
lua_assert(!g->gcemergency);
if (g->gcrunning) { /* running? */
if(isdecGCmodegen(g))
genstep(L, g);
else
incstep(L, g);
}
}
/*
** Perform a full collection in incremental mode.
** Before running the collection, check 'keepinvariant'; if it is true,
** there may be some objects marked as black, so the collector has
** to sweep all objects to turn them back to white (as white has not
** changed, nothing will be collected).
*/
static void fullinc (lua_State *L, global_State *g) {
if (keepinvariant(g)) /* black objects? */
entersweep(L); /* sweep everything to turn them back to white */
/* finish any pending sweep phase to start a new cycle */
luaC_runtilstate(L, bitmask(GCSpause));
luaC_runtilstate(L, bitmask(GCScallfin)); /* run up to finalizers */
/* estimate must be correct after a full GC cycle */
lua_assert(g->GCestimate == gettotalbytes(g));
luaC_runtilstate(L, bitmask(GCSpause)); /* finish collection */
setpause(g);
}
/*
** Performs a full GC cycle; if 'isemergency', set a flag to avoid
** some operations which could change the interpreter state in some
** unexpected ways (running finalizers and shrinking some structures).
*/
void luaC_fullgc (lua_State *L, int isemergency) {
global_State *g = G(L);
lua_assert(!g->gcemergency);
g->gcemergency = isemergency; /* set flag */
if (g->gckind == KGC_INC)
fullinc(L, g);
else
fullgen(L, g);
g->gcemergency = 0;
}
/* }====================================================== */
LINIT¶
/*
** $Id: linit.c $
** Initialization of libraries for lua.c and other clients
** See Copyright Notice in lua.h
*/
#define linit_c
#define LUA_LIB
/*
** If you embed Lua in your program and need to open the standard
** libraries, call luaL_openlibs in your program. If you need a
** different set of libraries, copy this file to your project and edit
** it to suit your needs.
**
** You can also *preload* libraries, so that a later 'require' can
** open the library, which is already linked to the application.
** For that, do the following code:
**
** luaL_getsubtable(L, LUA_REGISTRYINDEX, LUA_PRELOAD_TABLE);
** lua_pushcfunction(L, luaopen_modname);
** lua_setfield(L, -2, modname);
** lua_pop(L, 1); // remove PRELOAD table
*/
#include "lprefix.h"
#include <stddef.h>
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
#include "_native_lua_config.h" /* native Lua */
/*
** these libs are loaded by lua.c and are readily available to any Lua
** program
*/
static const luaL_Reg loadedlibs[] = {
{LUA_GNAME, luaopen_base},
{LUA_LOADLIBNAME, luaopen_package},
{LUA_COLIBNAME, luaopen_coroutine},
{LUA_TABLIBNAME, luaopen_table},
{LUA_IOLIBNAME, luaopen_io},
{LUA_OSLIBNAME, luaopen_os},
{LUA_STRLIBNAME, luaopen_string},
{LUA_MATHLIBNAME, luaopen_math},
{LUA_UTF8LIBNAME, luaopen_utf8},
{LUA_DBLIBNAME, luaopen_debug},
{NULL, NULL}
};
LUALIB_API void luaL_openlibs (lua_State *L) {
const luaL_Reg *lib;
/* "require" functions from 'loadedlibs' and set results to global table */
for (lib = loadedlibs; lib->func; lib++) {
luaL_requiref(L, lib->name, lib->func, 1);
lua_pop(L, 1); /* remove lib */
}
}
LIOLIB¶
/*
** $Id: liolib.c $
** Standard I/O (and system) library
** See Copyright Notice in lua.h
*/
#define liolib_c
#define LUA_LIB
#include "lprefix.h"
#include <ctype.h>
#include <errno.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "_native_lua_config.h" /* native Lua */
/*
** Change this macro to accept other modes for 'fopen' besides
** the standard ones.
*/
#if !defined(l_checkmode)
/* accepted extensions to 'mode' in 'fopen' */
#if !defined(L_MODEEXT)
#define L_MODEEXT "b"
#endif
/* Check whether 'mode' matches '[rwa]%+?[L_MODEEXT]*' */
static int l_checkmode (const char *mode) {
return (*mode != '\0' && strchr("rwa", *(mode++)) != NULL &&
(*mode != '+' || ((void)(++mode), 1)) && /* skip if char is '+' */
(strspn(mode, L_MODEEXT) == strlen(mode))); /* check extensions */
}
#endif
/*
** {======================================================
** l_popen spawns a new process connected to the current
** one through the file streams.
** =======================================================
*/
#if !defined(l_popen) /* { */
#if defined(LUA_USE_POSIX) /* { */
#define l_popen(L,c,m) (fflush(NULL), popen(c,m))
#define l_pclose(L,file) (pclose(file))
#elif defined(LUA_USE_WINDOWS) /* }{ */
#define l_popen(L,c,m) (_popen(c,m))
#define l_pclose(L,file) (_pclose(file))
#else /* }{ */
/* ISO C definitions */
#define l_popen(L,c,m) \
((void)c, (void)m, \
luaL_error(L, "'popen' not supported"), \
(FILE*)0)
#define l_pclose(L,file) ((void)L, (void)file, -1)
#endif /* } */
#endif /* } */
/* }====================================================== */
#if !defined(l_getc) /* { */
#if defined(LUA_USE_POSIX)
#define l_getc(f) getc_unlocked(f)
#define l_lockfile(f) flockfile(f)
#define l_unlockfile(f) funlockfile(f)
#else
#define l_getc(f) getc(f)
#define l_lockfile(f) ((void)0)
#define l_unlockfile(f) ((void)0)
#endif
#endif /* } */
/*
** {======================================================
** l_fseek: configuration for longer offsets
** =======================================================
*/
#if !defined(l_fseek) /* { */
#if defined(LUA_USE_POSIX) /* { */
#include <sys/types.h>
#define l_fseek(f,o,w) fseeko(f,o,w)
#define l_ftell(f) ftello(f)
#define l_seeknum off_t
#elif defined(LUA_USE_WINDOWS) && !defined(_CRTIMP_TYPEINFO) \
&& defined(_MSC_VER) && (_MSC_VER >= 1400) /* }{ */
/* Windows (but not DDK) and Visual C++ 2005 or higher */
#define l_fseek(f,o,w) _fseeki64(f,o,w)
#define l_ftell(f) _ftelli64(f)
#define l_seeknum __int64
#else /* }{ */
/* ISO C definitions */
#define l_fseek(f,o,w) fseek(f,o,w)
#define l_ftell(f) ftell(f)
#define l_seeknum long
#endif /* } */
#endif /* } */
/* }====================================================== */
#define IO_PREFIX "_IO_"
#define IOPREF_LEN (sizeof(IO_PREFIX)/sizeof(char) - 1)
#define IO_INPUT (IO_PREFIX "input")
#define IO_OUTPUT (IO_PREFIX "output")
typedef luaL_Stream LStream;
#define tolstream(L) ((LStream *)luaL_checkudata(L, 1, LUA_FILEHANDLE))
#define isclosed(p) ((p)->closef == NULL)
static int io_type (lua_State *L) {
LStream *p;
luaL_checkany(L, 1);
p = (LStream *)luaL_testudata(L, 1, LUA_FILEHANDLE);
if (p == NULL)
luaL_pushfail(L); /* not a file */
else if (isclosed(p))
lua_pushliteral(L, "closed file");
else
lua_pushliteral(L, "file");
return 1;
}
static int f_tostring (lua_State *L) {
LStream *p = tolstream(L);
if (isclosed(p))
lua_pushliteral(L, "file (closed)");
else
lua_pushfstring(L, "file (%p)", p->f);
return 1;
}
static FILE *tofile (lua_State *L) {
LStream *p = tolstream(L);
if (isclosed(p))
luaL_error(L, "attempt to use a closed file");
lua_assert(p->f);
return p->f;
}
/*
** When creating file handles, always creates a 'closed' file handle
** before opening the actual file; so, if there is a memory error, the
** handle is in a consistent state.
*/
static LStream *newprefile (lua_State *L) {
LStream *p = (LStream *)lua_newuserdatauv(L, sizeof(LStream), 0);
p->closef = NULL; /* mark file handle as 'closed' */
luaL_setmetatable(L, LUA_FILEHANDLE);
return p;
}
/*
** Calls the 'close' function from a file handle. The 'volatile' avoids
** a bug in some versions of the Clang compiler (e.g., clang 3.0 for
** 32 bits).
*/
static int aux_close (lua_State *L) {
LStream *p = tolstream(L);
volatile lua_CFunction cf = p->closef;
p->closef = NULL; /* mark stream as closed */
return (*cf)(L); /* close it */
}
static int f_close (lua_State *L) {
tofile(L); /* make sure argument is an open stream */
return aux_close(L);
}
static int io_close (lua_State *L) {
if (lua_isnone(L, 1)) /* no argument? */
lua_getfield(L, LUA_REGISTRYINDEX, IO_OUTPUT); /* use default output */
return f_close(L);
}
static int f_gc (lua_State *L) {
LStream *p = tolstream(L);
if (!isclosed(p) && p->f != NULL)
aux_close(L); /* ignore closed and incompletely open files */
return 0;
}
/*
** function to close regular files
*/
static int io_fclose (lua_State *L) {
LStream *p = tolstream(L);
int res = fclose(p->f);
return luaL_fileresult(L, (res == 0), NULL);
}
static LStream *newfile (lua_State *L) {
LStream *p = newprefile(L);
p->f = NULL;
p->closef = &io_fclose;
return p;
}
static void opencheck (lua_State *L, const char *fname, const char *mode) {
LStream *p = newfile(L);
p->f = fopen(fname, mode);
if (p->f == NULL)
luaL_error(L, "cannot open file '%s' (%s)", fname, strerror(errno));
}
static int io_open (lua_State *L) {
const char *filename = luaL_checkstring(L, 1);
const char *mode = luaL_optstring(L, 2, "r");
LStream *p = newfile(L);
const char *md = mode; /* to traverse/check mode */
luaL_argcheck(L, l_checkmode(md), 2, "invalid mode");
p->f = fopen(filename, mode);
return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
}
/*
** function to close 'popen' files
*/
static int io_pclose (lua_State *L) {
LStream *p = tolstream(L);
errno = 0;
return luaL_execresult(L, l_pclose(L, p->f));
}
static int io_popen (lua_State *L) {
const char *filename = luaL_checkstring(L, 1);
const char *mode = luaL_optstring(L, 2, "r");
LStream *p = newprefile(L);
p->f = l_popen(L, filename, mode);
p->closef = &io_pclose;
return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
}
static int io_tmpfile (lua_State *L) {
LStream *p = newfile(L);
p->f = tmpfile();
return (p->f == NULL) ? luaL_fileresult(L, 0, NULL) : 1;
}
static FILE *getiofile (lua_State *L, const char *findex) {
LStream *p;
lua_getfield(L, LUA_REGISTRYINDEX, findex);
p = (LStream *)lua_touserdata(L, -1);
if (isclosed(p))
luaL_error(L, "default %s file is closed", findex + IOPREF_LEN);
return p->f;
}
static int g_iofile (lua_State *L, const char *f, const char *mode) {
if (!lua_isnoneornil(L, 1)) {
const char *filename = lua_tostring(L, 1);
if (filename)
opencheck(L, filename, mode);
else {
tofile(L); /* check that it's a valid file handle */
lua_pushvalue(L, 1);
}
lua_setfield(L, LUA_REGISTRYINDEX, f);
}
/* return current value */
lua_getfield(L, LUA_REGISTRYINDEX, f);
return 1;
}
static int io_input (lua_State *L) {
return g_iofile(L, IO_INPUT, "r");
}
static int io_output (lua_State *L) {
return g_iofile(L, IO_OUTPUT, "w");
}
static int io_readline (lua_State *L);
/*
** maximum number of arguments to 'f:lines'/'io.lines' (it + 3 must fit
** in the limit for upvalues of a closure)
*/
#define MAXARGLINE 250
/*
** Auxiliary function to create the iteration function for 'lines'.
** The iteration function is a closure over 'io_readline', with
** the following upvalues:
** 1) The file being read (first value in the stack)
** 2) the number of arguments to read
** 3) a boolean, true iff file has to be closed when finished ('toclose')
** *) a variable number of format arguments (rest of the stack)
*/
static void aux_lines (lua_State *L, int toclose) {
int n = lua_gettop(L) - 1; /* number of arguments to read */
luaL_argcheck(L, n <= MAXARGLINE, MAXARGLINE + 2, "too many arguments");
lua_pushvalue(L, 1); /* file */
lua_pushinteger(L, n); /* number of arguments to read */
lua_pushboolean(L, toclose); /* close/not close file when finished */
lua_rotate(L, 2, 3); /* move the three values to their positions */
lua_pushcclosure(L, io_readline, 3 + n);
}
static int f_lines (lua_State *L) {
tofile(L); /* check that it's a valid file handle */
aux_lines(L, 0);
return 1;
}
/*
** Return an iteration function for 'io.lines'. If file has to be
** closed, also returns the file itself as a second result (to be
** closed as the state at the exit of a generic for).
*/
static int io_lines (lua_State *L) {
int toclose;
if (lua_isnone(L, 1)) lua_pushnil(L); /* at least one argument */
if (lua_isnil(L, 1)) { /* no file name? */
lua_getfield(L, LUA_REGISTRYINDEX, IO_INPUT); /* get default input */
lua_replace(L, 1); /* put it at index 1 */
tofile(L); /* check that it's a valid file handle */
toclose = 0; /* do not close it after iteration */
}
else { /* open a new file */
const char *filename = luaL_checkstring(L, 1);
opencheck(L, filename, "r");
lua_replace(L, 1); /* put file at index 1 */
toclose = 1; /* close it after iteration */
}
aux_lines(L, toclose); /* push iteration function */
if (toclose) {
lua_pushnil(L); /* state */
lua_pushnil(L); /* control */
lua_pushvalue(L, 1); /* file is the to-be-closed variable (4th result) */
return 4;
}
else
return 1;
}
/*
** {======================================================
** READ
** =======================================================
*/
/* maximum length of a numeral */
#if !defined (L_MAXLENNUM)
#define L_MAXLENNUM 200
#endif
/* auxiliary structure used by 'read_number' */
typedef struct {
FILE *f; /* file being read */
int c; /* current character (look ahead) */
int n; /* number of elements in buffer 'buff' */
char buff[L_MAXLENNUM + 1]; /* +1 for ending '\0' */
} RN;
/*
** Add current char to buffer (if not out of space) and read next one
*/
static int nextc (RN *rn) {
if (rn->n >= L_MAXLENNUM) { /* buffer overflow? */
rn->buff[0] = '\0'; /* invalidate result */
return 0; /* fail */
}
else {
rn->buff[rn->n++] = rn->c; /* save current char */
rn->c = l_getc(rn->f); /* read next one */
return 1;
}
}
/*
** Accept current char if it is in 'set' (of size 2)
*/
static int test2 (RN *rn, const char *set) {
if (rn->c == set[0] || rn->c == set[1])
return nextc(rn);
else return 0;
}
/*
** Read a sequence of (hex)digits
*/
static int readdigits (RN *rn, int hex) {
int count = 0;
while ((hex ? isxdigit(rn->c) : isdigit(rn->c)) && nextc(rn))
count++;
return count;
}
/*
** Read a number: first reads a valid prefix of a numeral into a buffer.
** Then it calls 'lua_stringtonumber' to check whether the format is
** correct and to convert it to a Lua number.
*/
static int read_number (lua_State *L, FILE *f) {
RN rn;
int count = 0;
int hex = 0;
char decp[2];
rn.f = f; rn.n = 0;
decp[0] = lua_getlocaledecpoint(); /* get decimal point from locale */
decp[1] = '.'; /* always accept a dot */
l_lockfile(rn.f);
do { rn.c = l_getc(rn.f); } while (isspace(rn.c)); /* skip spaces */
test2(&rn, "-+"); /* optional sign */
if (test2(&rn, "00")) {
if (test2(&rn, "xX")) hex = 1; /* numeral is hexadecimal */
else count = 1; /* count initial '0' as a valid digit */
}
count += readdigits(&rn, hex); /* integral part */
if (test2(&rn, decp)) /* decimal point? */
count += readdigits(&rn, hex); /* fractional part */
if (count > 0 && test2(&rn, (hex ? "pP" : "eE"))) { /* exponent mark? */
test2(&rn, "-+"); /* exponent sign */
readdigits(&rn, 0); /* exponent digits */
}
ungetc(rn.c, rn.f); /* unread look-ahead char */
l_unlockfile(rn.f);
rn.buff[rn.n] = '\0'; /* finish string */
if (lua_stringtonumber(L, rn.buff)) /* is this a valid number? */
return 1; /* ok */
else { /* invalid format */
lua_pushnil(L); /* "result" to be removed */
return 0; /* read fails */
}
}
static int test_eof (lua_State *L, FILE *f) {
int c = getc(f);
ungetc(c, f); /* no-op when c == EOF */
lua_pushliteral(L, "");
return (c != EOF);
}
static int read_line (lua_State *L, FILE *f, int chop) {
luaL_Buffer b;
int c;
luaL_buffinit(L, &b);
do { /* may need to read several chunks to get whole line */
char *buff = luaL_prepbuffer(&b); /* preallocate buffer space */
int i = 0;
l_lockfile(f); /* no memory errors can happen inside the lock */
while (i < LUAL_BUFFERSIZE && (c = l_getc(f)) != EOF && c != '\n')
buff[i++] = c; /* read up to end of line or buffer limit */
l_unlockfile(f);
luaL_addsize(&b, i);
} while (c != EOF && c != '\n'); /* repeat until end of line */
if (!chop && c == '\n') /* want a newline and have one? */
luaL_addchar(&b, c); /* add ending newline to result */
luaL_pushresult(&b); /* close buffer */
/* return ok if read something (either a newline or something else) */
return (c == '\n' || lua_rawlen(L, -1) > 0);
}
static void read_all (lua_State *L, FILE *f) {
size_t nr;
luaL_Buffer b;
luaL_buffinit(L, &b);
do { /* read file in chunks of LUAL_BUFFERSIZE bytes */
char *p = luaL_prepbuffer(&b);
nr = fread(p, sizeof(char), LUAL_BUFFERSIZE, f);
luaL_addsize(&b, nr);
} while (nr == LUAL_BUFFERSIZE);
luaL_pushresult(&b); /* close buffer */
}
static int read_chars (lua_State *L, FILE *f, size_t n) {
size_t nr; /* number of chars actually read */
char *p;
luaL_Buffer b;
luaL_buffinit(L, &b);
p = luaL_prepbuffsize(&b, n); /* prepare buffer to read whole block */
nr = fread(p, sizeof(char), n, f); /* try to read 'n' chars */
luaL_addsize(&b, nr);
luaL_pushresult(&b); /* close buffer */
return (nr > 0); /* true iff read something */
}
static int g_read (lua_State *L, FILE *f, int first) {
int nargs = lua_gettop(L) - 1;
int n, success;
clearerr(f);
if (nargs == 0) { /* no arguments? */
success = read_line(L, f, 1);
n = first + 1; /* to return 1 result */
}
else {
/* ensure stack space for all results and for auxlib's buffer */
luaL_checkstack(L, nargs+LUA_MINSTACK, "too many arguments");
success = 1;
for (n = first; nargs-- && success; n++) {
if (lua_type(L, n) == LUA_TNUMBER) {
size_t l = (size_t)luaL_checkinteger(L, n);
success = (l == 0) ? test_eof(L, f) : read_chars(L, f, l);
}
else {
const char *p = luaL_checkstring(L, n);
if (*p == '*') p++; /* skip optional '*' (for compatibility) */
switch (*p) {
case 'n': /* number */
success = read_number(L, f);
break;
case 'l': /* line */
success = read_line(L, f, 1);
break;
case 'L': /* line with end-of-line */
success = read_line(L, f, 0);
break;
case 'a': /* file */
read_all(L, f); /* read entire file */
success = 1; /* always success */
break;
default:
return luaL_argerror(L, n, "invalid format");
}
}
}
}
if (ferror(f))
return luaL_fileresult(L, 0, NULL);
if (!success) {
lua_pop(L, 1); /* remove last result */
luaL_pushfail(L); /* push nil instead */
}
return n - first;
}
static int io_read (lua_State *L) {
return g_read(L, getiofile(L, IO_INPUT), 1);
}
static int f_read (lua_State *L) {
return g_read(L, tofile(L), 2);
}
/*
** Iteration function for 'lines'.
*/
static int io_readline (lua_State *L) {
LStream *p = (LStream *)lua_touserdata(L, lua_upvalueindex(1));
int i;
int n = (int)lua_tointeger(L, lua_upvalueindex(2));
if (isclosed(p)) /* file is already closed? */
return luaL_error(L, "file is already closed");
lua_settop(L , 1);
luaL_checkstack(L, n, "too many arguments");
for (i = 1; i <= n; i++) /* push arguments to 'g_read' */
lua_pushvalue(L, lua_upvalueindex(3 + i));
n = g_read(L, p->f, 2); /* 'n' is number of results */
lua_assert(n > 0); /* should return at least a nil */
if (lua_toboolean(L, -n)) /* read at least one value? */
return n; /* return them */
else { /* first result is false: EOF or error */
if (n > 1) { /* is there error information? */
/* 2nd result is error message */
return luaL_error(L, "%s", lua_tostring(L, -n + 1));
}
if (lua_toboolean(L, lua_upvalueindex(3))) { /* generator created file? */
lua_settop(L, 0); /* clear stack */
lua_pushvalue(L, lua_upvalueindex(1)); /* push file at index 1 */
aux_close(L); /* close it */
}
return 0;
}
}
/* }====================================================== */
static int g_write (lua_State *L, FILE *f, int arg) {
int nargs = lua_gettop(L) - arg;
int status = 1;
for (; nargs--; arg++) {
if (lua_type(L, arg) == LUA_TNUMBER) {
/* optimization: could be done exactly as for strings */
int len = lua_isinteger(L, arg)
? fprintf(f, LUA_INTEGER_FMT,
(LUAI_UACINT)lua_tointeger(L, arg))
: fprintf(f, LUA_NUMBER_FMT,
(LUAI_UACNUMBER)lua_tonumber(L, arg));
status = status && (len > 0);
}
else {
size_t l;
const char *s = luaL_checklstring(L, arg, &l);
status = status && (fwrite(s, sizeof(char), l, f) == l);
}
}
if (status) return 1; /* file handle already on stack top */
else return luaL_fileresult(L, status, NULL);
}
static int io_write (lua_State *L) {
return g_write(L, getiofile(L, IO_OUTPUT), 1);
}
static int f_write (lua_State *L) {
FILE *f = tofile(L);
lua_pushvalue(L, 1); /* push file at the stack top (to be returned) */
return g_write(L, f, 2);
}
static int f_seek (lua_State *L) {
static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
static const char *const modenames[] = {"set", "cur", "end", NULL};
FILE *f = tofile(L);
int op = luaL_checkoption(L, 2, "cur", modenames);
lua_Integer p3 = luaL_optinteger(L, 3, 0);
l_seeknum offset = (l_seeknum)p3;
luaL_argcheck(L, (lua_Integer)offset == p3, 3,
"not an integer in proper range");
op = l_fseek(f, offset, mode[op]);
if (op)
return luaL_fileresult(L, 0, NULL); /* error */
else {
lua_pushinteger(L, (lua_Integer)l_ftell(f));
return 1;
}
}
static int f_setvbuf (lua_State *L) {
static const int mode[] = {_IONBF, _IOFBF, _IOLBF};
static const char *const modenames[] = {"no", "full", "line", NULL};
FILE *f = tofile(L);
int op = luaL_checkoption(L, 2, NULL, modenames);
lua_Integer sz = luaL_optinteger(L, 3, LUAL_BUFFERSIZE);
int res = setvbuf(f, NULL, mode[op], (size_t)sz);
return luaL_fileresult(L, res == 0, NULL);
}
static int io_flush (lua_State *L) {
return luaL_fileresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
}
static int f_flush (lua_State *L) {
return luaL_fileresult(L, fflush(tofile(L)) == 0, NULL);
}
/*
** functions for 'io' library
*/
static const luaL_Reg iolib[] = {
{"close", io_close},
{"flush", io_flush},
{"input", io_input},
{"lines", io_lines},
{"open", io_open},
{"output", io_output},
{"popen", io_popen},
{"read", io_read},
{"tmpfile", io_tmpfile},
{"type", io_type},
{"write", io_write},
{NULL, NULL}
};
/*
** methods for file handles
*/
static const luaL_Reg meth[] = {
{"read", f_read},
{"write", f_write},
{"lines", f_lines},
{"flush", f_flush},
{"seek", f_seek},
{"close", f_close},
{"setvbuf", f_setvbuf},
{NULL, NULL}
};
/*
** metamethods for file handles
*/
static const luaL_Reg metameth[] = {
{"__index", NULL}, /* place holder */
{"__gc", f_gc},
{"__close", f_gc},
{"__tostring", f_tostring},
{NULL, NULL}
};
static void createmeta (lua_State *L) {
luaL_newmetatable(L, LUA_FILEHANDLE); /* metatable for file handles */
luaL_setfuncs(L, metameth, 0); /* add metamethods to new metatable */
luaL_newlibtable(L, meth); /* create method table */
luaL_setfuncs(L, meth, 0); /* add file methods to method table */
lua_setfield(L, -2, "__index"); /* metatable.__index = method table */
lua_pop(L, 1); /* pop metatable */
}
/*
** function to (not) close the standard files stdin, stdout, and stderr
*/
static int io_noclose (lua_State *L) {
LStream *p = tolstream(L);
p->closef = &io_noclose; /* keep file opened */
luaL_pushfail(L);
lua_pushliteral(L, "cannot close standard file");
return 2;
}
static void createstdfile (lua_State *L, FILE *f, const char *k,
const char *fname) {
LStream *p = newprefile(L);
p->f = f;
p->closef = &io_noclose;
if (k != NULL) {
lua_pushvalue(L, -1);
lua_setfield(L, LUA_REGISTRYINDEX, k); /* add file to registry */
}
lua_setfield(L, -2, fname); /* add file to module */
}
LUAMOD_API int luaopen_io (lua_State *L) {
luaL_newlib(L, iolib); /* new module */
createmeta(L);
/* create (and set) default files */
createstdfile(L, stdin, IO_INPUT, "stdin");
createstdfile(L, stdout, IO_OUTPUT, "stdout");
createstdfile(L, stderr, NULL, "stderr");
return 1;
}
LLEX¶
/*
** $Id: llex.h $
** Lexical Analyzer
** See Copyright Notice in lua.h
*/
#ifndef llex_h
#define llex_h
#include "lobject.h"
#include "lzio.h"
#include "_native_lua_config.h" /* native Lua */
#define FIRST_RESERVED 257
#if !defined(LUA_ENV)
#define LUA_ENV "_ENV"
#endif
/*
* WARNING: if you change the order of this enumeration,
* grep "ORDER RESERVED"
*/
enum RESERVED {
/* terminal symbols denoted by reserved words */
TK_AND = FIRST_RESERVED, TK_BREAK,
TK_DO, TK_ELSE, TK_ELSEIF, TK_END, TK_FALSE, TK_FOR, TK_FUNCTION,
TK_GOTO, TK_IF, TK_IN, TK_LOCAL, TK_NIL, TK_NOT, TK_OR, TK_REPEAT,
TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE,
/* other terminal symbols */
TK_IDIV, TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE,
TK_SHL, TK_SHR,
TK_DBCOLON, TK_EOS,
TK_FLT, TK_INT, TK_NAME, TK_STRING
};
/* number of reserved words */
#define NUM_RESERVED (cast_int(TK_WHILE-FIRST_RESERVED + 1))
typedef union {
lua_Number r;
lua_Integer i;
TString *ts;
} SemInfo; /* semantics information */
typedef struct Token {
int token;
SemInfo seminfo;
} Token;
/* state of the lexer plus state of the parser when shared by all
functions */
typedef struct LexState {
int current; /* current character (charint) */
int linenumber; /* input line counter */
int lastline; /* line of last token 'consumed' */
Token t; /* current token */
Token lookahead; /* look ahead token */
struct FuncState *fs; /* current function (parser) */
struct lua_State *L;
ZIO *z; /* input stream */
Mbuffer *buff; /* buffer for tokens */
Table *h; /* to avoid collection/reuse strings */
struct Dyndata *dyd; /* dynamic structures used by the parser */
TString *source; /* current source name */
TString *envn; /* environment variable name */
} LexState;
LUAI_FUNC void luaX_init (lua_State *L);
LUAI_FUNC void luaX_setinput (lua_State *L, LexState *ls, ZIO *z,
TString *source, int firstchar);
LUAI_FUNC TString *luaX_newstring (LexState *ls, const char *str, size_t l);
LUAI_FUNC void luaX_next (LexState *ls);
LUAI_FUNC int luaX_lookahead (LexState *ls);
LUAI_FUNC l_noret luaX_syntaxerror (LexState *ls, const char *s);
LUAI_FUNC const char *luaX_token2str (LexState *ls, int token);
#endif
/*
** $Id: llex.c $
** Lexical Analyzer
** See Copyright Notice in lua.h
*/
#define llex_c
#define LUA_CORE
#include "lprefix.h"
#include <locale.h>
#include <string.h>
#include "lua.h"
#include "lctype.h"
#include "ldebug.h"
#include "ldo.h"
#include "lgc.h"
#include "llex.h"
#include "lobject.h"
#include "lparser.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "lzio.h"
#define next(ls) (ls->current = zgetc(ls->z))
#define currIsNewline(ls) (ls->current == '\n' || ls->current == '\r')
/* ORDER RESERVED */
static const char *const luaX_tokens [] = {
"and", "break", "do", "else", "elseif",
"end", "false", "for", "function", "goto", "if",
"in", "local", "nil", "not", "or", "repeat",
"return", "then", "true", "until", "while",
"//", "..", "...", "==", ">=", "<=", "~=",
"<<", ">>", "::", "<eof>",
"<number>", "<integer>", "<name>", "<string>"
};
#define save_and_next(ls) (save(ls, ls->current), next(ls))
static l_noret lexerror (LexState *ls, const char *msg, int token);
static void save (LexState *ls, int c) {
Mbuffer *b = ls->buff;
if (luaZ_bufflen(b) + 1 > luaZ_sizebuffer(b)) {
size_t newsize;
if (luaZ_sizebuffer(b) >= MAX_SIZE/2)
lexerror(ls, "lexical element too long", 0);
newsize = luaZ_sizebuffer(b) * 2;
luaZ_resizebuffer(ls->L, b, newsize);
}
b->buffer[luaZ_bufflen(b)++] = cast_char(c);
}
void luaX_init (lua_State *L) {
int i;
TString *e = luaS_newliteral(L, LUA_ENV); /* create env name */
luaC_fix(L, obj2gco(e)); /* never collect this name */
for (i=0; i<NUM_RESERVED; i++) {
TString *ts = luaS_new(L, luaX_tokens[i]);
luaC_fix(L, obj2gco(ts)); /* reserved words are never collected */
ts->extra = cast_byte(i+1); /* reserved word */
}
}
const char *luaX_token2str (LexState *ls, int token) {
if (token < FIRST_RESERVED) { /* single-byte symbols? */
lua_assert(token == cast_uchar(token));
if (lisprint(token))
return luaO_pushfstring(ls->L, "'%c'", token);
else /* control character */
return luaO_pushfstring(ls->L, "'<\\%d>'", token);
}
else {
const char *s = luaX_tokens[token - FIRST_RESERVED];
if (token < TK_EOS) /* fixed format (symbols and reserved words)? */
return luaO_pushfstring(ls->L, "'%s'", s);
else /* names, strings, and numerals */
return s;
}
}
static const char *txtToken (LexState *ls, int token) {
switch (token) {
case TK_NAME: case TK_STRING:
case TK_FLT: case TK_INT:
save(ls, '\0');
return luaO_pushfstring(ls->L, "'%s'", luaZ_buffer(ls->buff));
default:
return luaX_token2str(ls, token);
}
}
static l_noret lexerror (LexState *ls, const char *msg, int token) {
msg = luaG_addinfo(ls->L, msg, ls->source, ls->linenumber);
if (token)
luaO_pushfstring(ls->L, "%s near %s", msg, txtToken(ls, token));
luaD_throw(ls->L, LUA_ERRSYNTAX);
}
l_noret luaX_syntaxerror (LexState *ls, const char *msg) {
lexerror(ls, msg, ls->t.token);
}
/*
** creates a new string and anchors it in scanner's table so that
** it will not be collected until the end of the compilation
** (by that time it should be anchored somewhere)
*/
TString *luaX_newstring (LexState *ls, const char *str, size_t l) {
lua_State *L = ls->L;
TValue *o; /* entry for 'str' */
TString *ts = luaS_newlstr(L, str, l); /* create new string */
setsvalue2s(L, L->top++, ts); /* temporarily anchor it in stack */
o = luaH_set(L, ls->h, s2v(L->top - 1));
if (isempty(o)) { /* not in use yet? */
/* boolean value does not need GC barrier;
table is not a metatable, so it does not need to invalidate cache */
setbtvalue(o); /* t[string] = true */
luaC_checkGC(L);
}
else { /* string already present */
ts = keystrval(nodefromval(o)); /* re-use value previously stored */
}
L->top--; /* remove string from stack */
return ts;
}
/*
** increment line number and skips newline sequence (any of
** \n, \r, \n\r, or \r\n)
*/
static void inclinenumber (LexState *ls) {
int old = ls->current;
lua_assert(currIsNewline(ls));
next(ls); /* skip '\n' or '\r' */
if (currIsNewline(ls) && ls->current != old)
next(ls); /* skip '\n\r' or '\r\n' */
if (++ls->linenumber >= MAX_INT)
lexerror(ls, "chunk has too many lines", 0);
}
void luaX_setinput (lua_State *L, LexState *ls, ZIO *z, TString *source,
int firstchar) {
ls->t.token = 0;
ls->L = L;
ls->current = firstchar;
ls->lookahead.token = TK_EOS; /* no look-ahead token */
ls->z = z;
ls->fs = NULL;
ls->linenumber = 1;
ls->lastline = 1;
ls->source = source;
ls->envn = luaS_newliteral(L, LUA_ENV); /* get env name */
luaZ_resizebuffer(ls->L, ls->buff, LUA_MINBUFFER); /* initialize buffer */
}
/*
** =======================================================
** LEXICAL ANALYZER
** =======================================================
*/
static int check_next1 (LexState *ls, int c) {
if (ls->current == c) {
next(ls);
return 1;
}
else return 0;
}
/*
** Check whether current char is in set 'set' (with two chars) and
** saves it
*/
static int check_next2 (LexState *ls, const char *set) {
lua_assert(set[2] == '\0');
if (ls->current == set[0] || ls->current == set[1]) {
save_and_next(ls);
return 1;
}
else return 0;
}
/* LUA_NUMBER */
/*
** This function is quite liberal in what it accepts, as 'luaO_str2num'
** will reject ill-formed numerals. Roughly, it accepts the following
** pattern:
**
** %d(%x|%.|([Ee][+-]?))* | 0[Xx](%x|%.|([Pp][+-]?))*
**
** The only tricky part is to accept [+-] only after a valid exponent
** mark, to avoid reading '3-4' or '0xe+1' as a single number.
**
** The caller might have already read an initial dot.
*/
static int read_numeral (LexState *ls, SemInfo *seminfo) {
TValue obj;
const char *expo = "Ee";
int first = ls->current;
lua_assert(lisdigit(ls->current));
save_and_next(ls);
if (first == '0' && check_next2(ls, "xX")) /* hexadecimal? */
expo = "Pp";
for (;;) {
if (check_next2(ls, expo)) /* exponent mark? */
check_next2(ls, "-+"); /* optional exponent sign */
else if (lisxdigit(ls->current) || ls->current == '.') /* '%x|%.' */
save_and_next(ls);
else break;
}
if (lislalpha(ls->current)) /* is numeral touching a letter? */
save_and_next(ls); /* force an error */
save(ls, '\0');
if (luaO_str2num(luaZ_buffer(ls->buff), &obj) == 0) /* format error? */
lexerror(ls, "malformed number", TK_FLT);
if (ttisinteger(&obj)) {
seminfo->i = ivalue(&obj);
return TK_INT;
}
else {
lua_assert(ttisfloat(&obj));
seminfo->r = fltvalue(&obj);
return TK_FLT;
}
}
/*
** reads a sequence '[=*[' or ']=*]', leaving the last bracket.
** If sequence is well formed, return its number of '='s + 2; otherwise,
** return 1 if there is no '='s or 0 otherwise (an unfinished '[==...').
*/
static size_t skip_sep (LexState *ls) {
size_t count = 0;
int s = ls->current;
lua_assert(s == '[' || s == ']');
save_and_next(ls);
while (ls->current == '=') {
save_and_next(ls);
count++;
}
return (ls->current == s) ? count + 2
: (count == 0) ? 1
: 0;
}
static void read_long_string (LexState *ls, SemInfo *seminfo, size_t sep) {
int line = ls->linenumber; /* initial line (for error message) */
save_and_next(ls); /* skip 2nd '[' */
if (currIsNewline(ls)) /* string starts with a newline? */
inclinenumber(ls); /* skip it */
for (;;) {
switch (ls->current) {
case EOZ: { /* error */
const char *what = (seminfo ? "string" : "comment");
const char *msg = luaO_pushfstring(ls->L,
"unfinished long %s (starting at line %d)", what, line);
lexerror(ls, msg, TK_EOS);
break; /* to avoid warnings */
}
case ']': {
if (skip_sep(ls) == sep) {
save_and_next(ls); /* skip 2nd ']' */
goto endloop;
}
break;
}
case '\n': case '\r': {
save(ls, '\n');
inclinenumber(ls);
if (!seminfo) luaZ_resetbuffer(ls->buff); /* avoid wasting space */
break;
}
default: {
if (seminfo) save_and_next(ls);
else next(ls);
}
}
} endloop:
if (seminfo)
seminfo->ts = luaX_newstring(ls, luaZ_buffer(ls->buff) + sep,
luaZ_bufflen(ls->buff) - 2 * sep);
}
static void esccheck (LexState *ls, int c, const char *msg) {
if (!c) {
if (ls->current != EOZ)
save_and_next(ls); /* add current to buffer for error message */
lexerror(ls, msg, TK_STRING);
}
}
static int gethexa (LexState *ls) {
save_and_next(ls);
esccheck (ls, lisxdigit(ls->current), "hexadecimal digit expected");
return luaO_hexavalue(ls->current);
}
static int readhexaesc (LexState *ls) {
int r = gethexa(ls);
r = (r << 4) + gethexa(ls);
luaZ_buffremove(ls->buff, 2); /* remove saved chars from buffer */
return r;
}
static unsigned long readutf8esc (LexState *ls) {
unsigned long r;
int i = 4; /* chars to be removed: '\', 'u', '{', and first digit */
save_and_next(ls); /* skip 'u' */
esccheck(ls, ls->current == '{', "missing '{'");
r = gethexa(ls); /* must have at least one digit */
while (cast_void(save_and_next(ls)), lisxdigit(ls->current)) {
i++;
esccheck(ls, r <= (0x7FFFFFFFu >> 4), "UTF-8 value too large");
r = (r << 4) + luaO_hexavalue(ls->current);
}
esccheck(ls, ls->current == '}', "missing '}'");
next(ls); /* skip '}' */
luaZ_buffremove(ls->buff, i); /* remove saved chars from buffer */
return r;
}
static void utf8esc (LexState *ls) {
char buff[UTF8BUFFSZ];
int n = luaO_utf8esc(buff, readutf8esc(ls));
for (; n > 0; n--) /* add 'buff' to string */
save(ls, buff[UTF8BUFFSZ - n]);
}
static int readdecesc (LexState *ls) {
int i;
int r = 0; /* result accumulator */
for (i = 0; i < 3 && lisdigit(ls->current); i++) { /* read up to 3 digits */
r = 10*r + ls->current - '0';
save_and_next(ls);
}
esccheck(ls, r <= UCHAR_MAX, "decimal escape too large");
luaZ_buffremove(ls->buff, i); /* remove read digits from buffer */
return r;
}
static void read_string (LexState *ls, int del, SemInfo *seminfo) {
save_and_next(ls); /* keep delimiter (for error messages) */
while (ls->current != del) {
switch (ls->current) {
case EOZ:
lexerror(ls, "unfinished string", TK_EOS);
break; /* to avoid warnings */
case '\n':
case '\r':
lexerror(ls, "unfinished string", TK_STRING);
break; /* to avoid warnings */
case '\\': { /* escape sequences */
int c; /* final character to be saved */
save_and_next(ls); /* keep '\\' for error messages */
switch (ls->current) {
case 'a': c = '\a'; goto read_save;
case 'b': c = '\b'; goto read_save;
case 'f': c = '\f'; goto read_save;
case 'n': c = '\n'; goto read_save;
case 'r': c = '\r'; goto read_save;
case 't': c = '\t'; goto read_save;
case 'v': c = '\v'; goto read_save;
case 'x': c = readhexaesc(ls); goto read_save;
case 'u': utf8esc(ls); goto no_save;
case '\n': case '\r':
inclinenumber(ls); c = '\n'; goto only_save;
case '\\': case '\"': case '\'':
c = ls->current; goto read_save;
case EOZ: goto no_save; /* will raise an error next loop */
case 'z': { /* zap following span of spaces */
luaZ_buffremove(ls->buff, 1); /* remove '\\' */
next(ls); /* skip the 'z' */
while (lisspace(ls->current)) {
if (currIsNewline(ls)) inclinenumber(ls);
else next(ls);
}
goto no_save;
}
default: {
esccheck(ls, lisdigit(ls->current), "invalid escape sequence");
c = readdecesc(ls); /* digital escape '\ddd' */
goto only_save;
}
}
read_save:
next(ls);
/* go through */
only_save:
luaZ_buffremove(ls->buff, 1); /* remove '\\' */
save(ls, c);
/* go through */
no_save: break;
}
default:
save_and_next(ls);
}
}
save_and_next(ls); /* skip delimiter */
seminfo->ts = luaX_newstring(ls, luaZ_buffer(ls->buff) + 1,
luaZ_bufflen(ls->buff) - 2);
}
static int llex (LexState *ls, SemInfo *seminfo) {
luaZ_resetbuffer(ls->buff);
for (;;) {
switch (ls->current) {
case '\n': case '\r': { /* line breaks */
inclinenumber(ls);
break;
}
case ' ': case '\f': case '\t': case '\v': { /* spaces */
next(ls);
break;
}
case '-': { /* '-' or '--' (comment) */
next(ls);
if (ls->current != '-') return '-';
/* else is a comment */
next(ls);
if (ls->current == '[') { /* long comment? */
size_t sep = skip_sep(ls);
luaZ_resetbuffer(ls->buff); /* 'skip_sep' may dirty the buffer */
if (sep >= 2) {
read_long_string(ls, NULL, sep); /* skip long comment */
luaZ_resetbuffer(ls->buff); /* previous call may dirty the buff. */
break;
}
}
/* else short comment */
while (!currIsNewline(ls) && ls->current != EOZ)
next(ls); /* skip until end of line (or end of file) */
break;
}
case '[': { /* long string or simply '[' */
size_t sep = skip_sep(ls);
if (sep >= 2) {
read_long_string(ls, seminfo, sep);
return TK_STRING;
}
else if (sep == 0) /* '[=...' missing second bracket? */
lexerror(ls, "invalid long string delimiter", TK_STRING);
return '[';
}
case '=': {
next(ls);
if (check_next1(ls, '=')) return TK_EQ;
else return '=';
}
case '<': {
next(ls);
if (check_next1(ls, '=')) return TK_LE;
else if (check_next1(ls, '<')) return TK_SHL;
else return '<';
}
case '>': {
next(ls);
if (check_next1(ls, '=')) return TK_GE;
else if (check_next1(ls, '>')) return TK_SHR;
else return '>';
}
case '/': {
next(ls);
if (check_next1(ls, '/')) return TK_IDIV;
else return '/';
}
case '~': {
next(ls);
if (check_next1(ls, '=')) return TK_NE;
else return '~';
}
case ':': {
next(ls);
if (check_next1(ls, ':')) return TK_DBCOLON;
else return ':';
}
case '"': case '\'': { /* short literal strings */
read_string(ls, ls->current, seminfo);
return TK_STRING;
}
case '.': { /* '.', '..', '...', or number */
save_and_next(ls);
if (check_next1(ls, '.')) {
if (check_next1(ls, '.'))
return TK_DOTS; /* '...' */
else return TK_CONCAT; /* '..' */
}
else if (!lisdigit(ls->current)) return '.';
else return read_numeral(ls, seminfo);
}
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9': {
return read_numeral(ls, seminfo);
}
case EOZ: {
return TK_EOS;
}
default: {
if (lislalpha(ls->current)) { /* identifier or reserved word? */
TString *ts;
do {
save_and_next(ls);
} while (lislalnum(ls->current));
ts = luaX_newstring(ls, luaZ_buffer(ls->buff),
luaZ_bufflen(ls->buff));
seminfo->ts = ts;
if (isreserved(ts)) /* reserved word? */
return ts->extra - 1 + FIRST_RESERVED;
else {
return TK_NAME;
}
}
else { /* single-char tokens (+ - / ...) */
int c = ls->current;
next(ls);
return c;
}
}
}
}
}
void luaX_next (LexState *ls) {
ls->lastline = ls->linenumber;
if (ls->lookahead.token != TK_EOS) { /* is there a look-ahead token? */
ls->t = ls->lookahead; /* use this one */
ls->lookahead.token = TK_EOS; /* and discharge it */
}
else
ls->t.token = llex(ls, &ls->t.seminfo); /* read next token */
}
int luaX_lookahead (LexState *ls) {
lua_assert(ls->lookahead.token == TK_EOS);
ls->lookahead.token = llex(ls, &ls->lookahead.seminfo);
return ls->lookahead.token;
}
LLIMITS¶
/*
** $Id: llimits.h $
** Limits, basic types, and some other 'installation-dependent' definitions
** See Copyright Notice in lua.h
*/
#ifndef llimits_h
#define llimits_h
#include <limits.h>
#include <stddef.h>
#include "lua.h"
#include "_native_lua_config.h" /* native Lua */
/*
** 'lu_mem' and 'l_mem' are unsigned/signed integers big enough to count
** the total memory used by Lua (in bytes). Usually, 'size_t' and
** 'ptrdiff_t' should work, but we use 'long' for 16-bit machines.
*/
#if defined(LUAI_MEM) /* { external definitions? */
typedef LUAI_UMEM lu_mem;
typedef LUAI_MEM l_mem;
#elif LUAI_IS32INT /* }{ */
typedef size_t lu_mem;
typedef ptrdiff_t l_mem;
#else /* 16-bit ints */ /* }{ */
typedef unsigned long lu_mem;
typedef long l_mem;
#endif /* } */
/* chars used as small naturals (so that 'char' is reserved for characters) */
typedef unsigned char lu_byte;
typedef signed char ls_byte;
/* maximum value for size_t */
#define MAX_SIZET ((size_t)(~(size_t)0))
/* maximum size visible for Lua (must be representable in a lua_Integer) */
#define MAX_SIZE (sizeof(size_t) < sizeof(lua_Integer) ? MAX_SIZET \
: (size_t)(LUA_MAXINTEGER))
#define MAX_LUMEM ((lu_mem)(~(lu_mem)0))
#define MAX_LMEM ((l_mem)(MAX_LUMEM >> 1))
#define MAX_INT INT_MAX /* maximum value of an int */
/*
** floor of the log2 of the maximum signed value for integral type 't'.
** (That is, maximum 'n' such that '2^n' fits in the given signed type.)
*/
#define log2maxs(t) (sizeof(t) * 8 - 2)
/*
** test whether an unsigned value is a power of 2 (or zero)
*/
#define ispow2(x) (((x) & ((x) - 1)) == 0)
/* number of chars of a literal string without the ending \0 */
#define LL(x) (sizeof(x)/sizeof(char) - 1)
/*
** conversion of pointer to unsigned integer:
** this is for hashing only; there is no problem if the integer
** cannot hold the whole pointer value
*/
#define point2uint(p) ((unsigned int)((size_t)(p) & UINT_MAX))
/* types of 'usual argument conversions' for lua_Number and lua_Integer */
typedef LUAI_UACNUMBER l_uacNumber;
typedef LUAI_UACINT l_uacInt;
/* internal assertions for in-house debugging */
#if defined(lua_assert)
#define check_exp(c,e) (lua_assert(c), (e))
/* to avoid problems with conditions too long */
#define lua_longassert(c) ((c) ? (void)0 : lua_assert(0))
#else
#define lua_assert(c) ((void)0)
#define check_exp(c,e) (e)
#define lua_longassert(c) ((void)0)
#endif
/*
** assertion for checking API calls
*/
#if !defined(luai_apicheck)
#define luai_apicheck(l,e) ((void)l, lua_assert(e))
#endif
#define api_check(l,e,msg) luai_apicheck(l,(e) && msg)
/* macro to avoid warnings about unused variables */
#if !defined(UNUSED)
#define UNUSED(x) ((void)(x))
#endif
/* type casts (a macro highlights casts in the code) */
#define cast(t, exp) ((t)(exp))
#define cast_void(i) cast(void, (i))
#define cast_voidp(i) cast(void *, (i))
#define cast_num(i) cast(lua_Number, (i))
#define cast_int(i) cast(int, (i))
#define cast_uint(i) cast(unsigned int, (i))
#define cast_byte(i) cast(lu_byte, (i))
#define cast_uchar(i) cast(unsigned char, (i))
#define cast_char(i) cast(char, (i))
#define cast_charp(i) cast(char *, (i))
#define cast_sizet(i) cast(size_t, (i))
/* cast a signed lua_Integer to lua_Unsigned */
#if !defined(l_castS2U)
#define l_castS2U(i) ((lua_Unsigned)(i))
#endif
/*
** cast a lua_Unsigned to a signed lua_Integer; this cast is
** not strict ISO C, but two-complement architectures should
** work fine.
*/
#if !defined(l_castU2S)
#define l_castU2S(i) ((lua_Integer)(i))
#endif
/*
** macros to improve jump prediction (used mainly for error handling)
*/
#if !defined(likely)
#if defined(__GNUC__)
#define likely(x) (__builtin_expect(((x) != 0), 1))
#define unlikely(x) (__builtin_expect(((x) != 0), 0))
#else
#define likely(x) (x)
#define unlikely(x) (x)
#endif
#endif
/*
** non-return type
*/
#if !defined(l_noret)
#if defined(__GNUC__)
#define l_noret void __attribute__((noreturn))
#elif defined(_MSC_VER) && _MSC_VER >= 1200
#define l_noret void __declspec(noreturn)
#else
#define l_noret void
#endif
#endif
/*
** type for virtual-machine instructions;
** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)
*/
#if LUAI_IS32INT
typedef unsigned int l_uint32;
#else
typedef unsigned long l_uint32;
#endif
typedef l_uint32 Instruction;
/*
** Maximum length for short strings, that is, strings that are
** internalized. (Cannot be smaller than reserved words or tags for
** metamethods, as these strings must be internalized;
** #("function") = 8, #("__newindex") = 10.)
*/
#if !defined(LUAI_MAXSHORTLEN)
#define LUAI_MAXSHORTLEN 40
#endif
/*
** Initial size for the string table (must be power of 2).
** The Lua core alone registers ~50 strings (reserved words +
** metaevent keys + a few others). Libraries would typically add
** a few dozens more.
*/
#if !defined(MINSTRTABSIZE)
#define MINSTRTABSIZE 128
#endif
/*
** Size of cache for strings in the API. 'N' is the number of
** sets (better be a prime) and "M" is the size of each set (M == 1
** makes a direct cache.)
*/
#if !defined(STRCACHE_N)
#define STRCACHE_N 53
#define STRCACHE_M 2
#endif
/* minimum size for string buffer */
#if !defined(LUA_MINBUFFER)
#define LUA_MINBUFFER 32
#endif
/*
** macros that are executed whenever program enters the Lua core
** ('lua_lock') and leaves the core ('lua_unlock')
*/
#if !defined(lua_lock)
#define lua_lock(L) ((void) 0)
#define lua_unlock(L) ((void) 0)
#endif
/*
** macro executed during Lua functions at points where the
** function can yield.
*/
#if !defined(luai_threadyield)
#define luai_threadyield(L) {lua_unlock(L); lua_lock(L);}
#endif
/*
** these macros allow user-specific actions when a thread is
** created/deleted/resumed/yielded.
*/
#if !defined(luai_userstateopen)
#define luai_userstateopen(L) ((void)L)
#endif
#if !defined(luai_userstateclose)
#define luai_userstateclose(L) ((void)L)
#endif
#if !defined(luai_userstatethread)
#define luai_userstatethread(L,L1) ((void)L)
#endif
#if !defined(luai_userstatefree)
#define luai_userstatefree(L,L1) ((void)L)
#endif
#if !defined(luai_userstateresume)
#define luai_userstateresume(L,n) ((void)L)
#endif
#if !defined(luai_userstateyield)
#define luai_userstateyield(L,n) ((void)L)
#endif
/*
** The luai_num* macros define the primitive operations over numbers.
*/
/* floor division (defined as 'floor(a/b)') */
#if !defined(luai_numidiv)
#define luai_numidiv(L,a,b) ((void)L, l_floor(luai_numdiv(L,a,b)))
#endif
/* float division */
#if !defined(luai_numdiv)
#define luai_numdiv(L,a,b) ((a)/(b))
#endif
/*
** modulo: defined as 'a - floor(a/b)*b'; the direct computation
** using this definition has several problems with rounding errors,
** so it is better to use 'fmod'. 'fmod' gives the result of
** 'a - trunc(a/b)*b', and therefore must be corrected when
** 'trunc(a/b) ~= floor(a/b)'. That happens when the division has a
** non-integer negative result: non-integer result is equivalent to
** a non-zero remainder 'm'; negative result is equivalent to 'a' and
** 'b' with different signs, or 'm' and 'b' with different signs
** (as the result 'm' of 'fmod' has the same sign of 'a').
*/
#if !defined(luai_nummod)
#define luai_nummod(L,a,b,m) \
{ (void)L; (m) = l_mathop(fmod)(a,b); \
if (((m) > 0) ? (b) < 0 : ((m) < 0 && (b) > 0)) (m) += (b); }
#endif
/* exponentiation */
#if !defined(luai_numpow)
#define luai_numpow(L,a,b) ((void)L, l_mathop(pow)(a,b))
#endif
/* the others are quite standard operations */
#if !defined(luai_numadd)
#define luai_numadd(L,a,b) ((a)+(b))
#define luai_numsub(L,a,b) ((a)-(b))
#define luai_nummul(L,a,b) ((a)*(b))
#define luai_numunm(L,a) (-(a))
#define luai_numeq(a,b) ((a)==(b))
#define luai_numlt(a,b) ((a)<(b))
#define luai_numle(a,b) ((a)<=(b))
#define luai_numgt(a,b) ((a)>(b))
#define luai_numge(a,b) ((a)>=(b))
#define luai_numisnan(a) (!luai_numeq((a), (a)))
#endif
/*
** macro to control inclusion of some hard tests on stack reallocation
*/
#if !defined(HARDSTACKTESTS)
#define condmovestack(L,pre,pos) ((void)0)
#else
/* realloc stack keeping its size */
#define condmovestack(L,pre,pos) \
{ int sz_ = (L)->stacksize; pre; luaD_reallocstack((L), sz_, 0); pos; }
#endif
#if !defined(HARDMEMTESTS)
#define condchangemem(L,pre,pos) ((void)0)
#else
#define condchangemem(L,pre,pos) \
{ if (G(L)->gcrunning) { pre; luaC_fullgc(L, 0); pos; } }
#endif
#endif
LMATHLIB¶
/*
** $Id: lmathlib.c $
** Standard mathematical library
** See Copyright Notice in lua.h
*/
#define lmathlib_c
#define LUA_LIB
#include "lprefix.h"
#include <float.h>
#include <limits.h>
#include <math.h>
#include <stdlib.h>
#include <time.h>
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "_native_lua_config.h" /* native Lua */
#undef PI
#define PI (l_mathop(3.141592653589793238462643383279502884))
static int math_abs (lua_State *L) {
if (lua_isinteger(L, 1)) {
lua_Integer n = lua_tointeger(L, 1);
if (n < 0) n = (lua_Integer)(0u - (lua_Unsigned)n);
lua_pushinteger(L, n);
}
else
lua_pushnumber(L, l_mathop(fabs)(luaL_checknumber(L, 1)));
return 1;
}
static int math_sin (lua_State *L) {
lua_pushnumber(L, l_mathop(sin)(luaL_checknumber(L, 1)));
return 1;
}
static int math_cos (lua_State *L) {
lua_pushnumber(L, l_mathop(cos)(luaL_checknumber(L, 1)));
return 1;
}
static int math_tan (lua_State *L) {
lua_pushnumber(L, l_mathop(tan)(luaL_checknumber(L, 1)));
return 1;
}
static int math_asin (lua_State *L) {
lua_pushnumber(L, l_mathop(asin)(luaL_checknumber(L, 1)));
return 1;
}
static int math_acos (lua_State *L) {
lua_pushnumber(L, l_mathop(acos)(luaL_checknumber(L, 1)));
return 1;
}
static int math_atan (lua_State *L) {
lua_Number y = luaL_checknumber(L, 1);
lua_Number x = luaL_optnumber(L, 2, 1);
lua_pushnumber(L, l_mathop(atan2)(y, x));
return 1;
}
static int math_toint (lua_State *L) {
int valid;
lua_Integer n = lua_tointegerx(L, 1, &valid);
if (valid)
lua_pushinteger(L, n);
else {
luaL_checkany(L, 1);
luaL_pushfail(L); /* value is not convertible to integer */
}
return 1;
}
static void pushnumint (lua_State *L, lua_Number d) {
lua_Integer n;
if (lua_numbertointeger(d, &n)) /* does 'd' fit in an integer? */
lua_pushinteger(L, n); /* result is integer */
else
lua_pushnumber(L, d); /* result is float */
}
static int math_floor (lua_State *L) {
if (lua_isinteger(L, 1))
lua_settop(L, 1); /* integer is its own floor */
else {
lua_Number d = l_mathop(floor)(luaL_checknumber(L, 1));
pushnumint(L, d);
}
return 1;
}
static int math_ceil (lua_State *L) {
if (lua_isinteger(L, 1))
lua_settop(L, 1); /* integer is its own ceil */
else {
lua_Number d = l_mathop(ceil)(luaL_checknumber(L, 1));
pushnumint(L, d);
}
return 1;
}
static int math_fmod (lua_State *L) {
if (lua_isinteger(L, 1) && lua_isinteger(L, 2)) {
lua_Integer d = lua_tointeger(L, 2);
if ((lua_Unsigned)d + 1u <= 1u) { /* special cases: -1 or 0 */
luaL_argcheck(L, d != 0, 2, "zero");
lua_pushinteger(L, 0); /* avoid overflow with 0x80000... / -1 */
}
else
lua_pushinteger(L, lua_tointeger(L, 1) % d);
}
else
lua_pushnumber(L, l_mathop(fmod)(luaL_checknumber(L, 1),
luaL_checknumber(L, 2)));
return 1;
}
/*
** next function does not use 'modf', avoiding problems with 'double*'
** (which is not compatible with 'float*') when lua_Number is not
** 'double'.
*/
static int math_modf (lua_State *L) {
if (lua_isinteger(L ,1)) {
lua_settop(L, 1); /* number is its own integer part */
lua_pushnumber(L, 0); /* no fractional part */
}
else {
lua_Number n = luaL_checknumber(L, 1);
/* integer part (rounds toward zero) */
lua_Number ip = (n < 0) ? l_mathop(ceil)(n) : l_mathop(floor)(n);
pushnumint(L, ip);
/* fractional part (test needed for inf/-inf) */
lua_pushnumber(L, (n == ip) ? l_mathop(0.0) : (n - ip));
}
return 2;
}
static int math_sqrt (lua_State *L) {
lua_pushnumber(L, l_mathop(sqrt)(luaL_checknumber(L, 1)));
return 1;
}
static int math_ult (lua_State *L) {
lua_Integer a = luaL_checkinteger(L, 1);
lua_Integer b = luaL_checkinteger(L, 2);
lua_pushboolean(L, (lua_Unsigned)a < (lua_Unsigned)b);
return 1;
}
static int math_log (lua_State *L) {
lua_Number x = luaL_checknumber(L, 1);
lua_Number res;
if (lua_isnoneornil(L, 2))
res = l_mathop(log)(x);
else {
lua_Number base = luaL_checknumber(L, 2);
#if !defined(LUA_USE_C89)
if (base == l_mathop(2.0))
res = l_mathop(log2)(x); else
#endif
if (base == l_mathop(10.0))
res = l_mathop(log10)(x);
else
res = l_mathop(log)(x)/l_mathop(log)(base);
}
lua_pushnumber(L, res);
return 1;
}
static int math_exp (lua_State *L) {
lua_pushnumber(L, l_mathop(exp)(luaL_checknumber(L, 1)));
return 1;
}
static int math_deg (lua_State *L) {
lua_pushnumber(L, luaL_checknumber(L, 1) * (l_mathop(180.0) / PI));
return 1;
}
static int math_rad (lua_State *L) {
lua_pushnumber(L, luaL_checknumber(L, 1) * (PI / l_mathop(180.0)));
return 1;
}
static int math_min (lua_State *L) {
int n = lua_gettop(L); /* number of arguments */
int imin = 1; /* index of current minimum value */
int i;
luaL_argcheck(L, n >= 1, 1, "value expected");
for (i = 2; i <= n; i++) {
if (lua_compare(L, i, imin, LUA_OPLT))
imin = i;
}
lua_pushvalue(L, imin);
return 1;
}
static int math_max (lua_State *L) {
int n = lua_gettop(L); /* number of arguments */
int imax = 1; /* index of current maximum value */
int i;
luaL_argcheck(L, n >= 1, 1, "value expected");
for (i = 2; i <= n; i++) {
if (lua_compare(L, imax, i, LUA_OPLT))
imax = i;
}
lua_pushvalue(L, imax);
return 1;
}
static int math_type (lua_State *L) {
if (lua_type(L, 1) == LUA_TNUMBER)
lua_pushstring(L, (lua_isinteger(L, 1)) ? "integer" : "float");
else {
luaL_checkany(L, 1);
luaL_pushfail(L);
}
return 1;
}
/*
** {==================================================================
** Pseudo-Random Number Generator based on 'xoshiro256**'.
** ===================================================================
*/
/* number of binary digits in the mantissa of a float */
#define FIGS l_floatatt(MANT_DIG)
#if FIGS > 64
/* there are only 64 random bits; use them all */
#undef FIGS
#define FIGS 64
#endif
/*
** LUA_RAND32 forces the use of 32-bit integers in the implementation
** of the PRN generator (mainly for testing).
*/
#if !defined(LUA_RAND32) && !defined(Rand64)
/* try to find an integer type with at least 64 bits */
#if (ULONG_MAX >> 31 >> 31) >= 3
/* 'long' has at least 64 bits */
#define Rand64 unsigned long
#elif !defined(LUA_USE_C89) && defined(LLONG_MAX)
/* there is a 'long long' type (which must have at least 64 bits) */
#define Rand64 unsigned long long
#elif (LUA_MAXUNSIGNED >> 31 >> 31) >= 3
/* 'lua_Integer' has at least 64 bits */
#define Rand64 lua_Unsigned
#endif
#endif
#if defined(Rand64) /* { */
/*
** Standard implementation, using 64-bit integers.
** If 'Rand64' has more than 64 bits, the extra bits do not interfere
** with the 64 initial bits, except in a right shift. Moreover, the
** final result has to discard the extra bits.
*/
/* avoid using extra bits when needed */
#define trim64(x) ((x) & 0xffffffffffffffffu)
/* rotate left 'x' by 'n' bits */
static Rand64 rotl (Rand64 x, int n) {
return (x << n) | (trim64(x) >> (64 - n));
}
static Rand64 nextrand (Rand64 *state) {
Rand64 state0 = state[0];
Rand64 state1 = state[1];
Rand64 state2 = state[2] ^ state0;
Rand64 state3 = state[3] ^ state1;
Rand64 res = rotl(state1 * 5, 7) * 9;
state[0] = state0 ^ state3;
state[1] = state1 ^ state2;
state[2] = state2 ^ (state1 << 17);
state[3] = rotl(state3, 45);
return res;
}
/* must take care to not shift stuff by more than 63 slots */
/*
** Convert bits from a random integer into a float in the
** interval [0,1), getting the higher FIG bits from the
** random unsigned integer and converting that to a float.
*/
/* must throw out the extra (64 - FIGS) bits */
#define shift64_FIG (64 - FIGS)
/* to scale to [0, 1), multiply by scaleFIG = 2^(-FIGS) */
#define scaleFIG (l_mathop(0.5) / ((Rand64)1 << (FIGS - 1)))
static lua_Number I2d (Rand64 x) {
return (lua_Number)(trim64(x) >> shift64_FIG) * scaleFIG;
}
/* convert a 'Rand64' to a 'lua_Unsigned' */
#define I2UInt(x) ((lua_Unsigned)trim64(x))
/* convert a 'lua_Unsigned' to a 'Rand64' */
#define Int2I(x) ((Rand64)(x))
#else /* no 'Rand64' }{ */
/* get an integer with at least 32 bits */
#if LUAI_IS32INT
typedef unsigned int lu_int32;
#else
typedef unsigned long lu_int32;
#endif
/*
** Use two 32-bit integers to represent a 64-bit quantity.
*/
typedef struct Rand64 {
lu_int32 h; /* higher half */
lu_int32 l; /* lower half */
} Rand64;
/*
** If 'lu_int32' has more than 32 bits, the extra bits do not interfere
** with the 32 initial bits, except in a right shift and comparisons.
** Moreover, the final result has to discard the extra bits.
*/
/* avoid using extra bits when needed */
#define trim32(x) ((x) & 0xffffffffu)
/*
** basic operations on 'Rand64' values
*/
/* build a new Rand64 value */
static Rand64 packI (lu_int32 h, lu_int32 l) {
Rand64 result;
result.h = h;
result.l = l;
return result;
}
/* return i << n */
static Rand64 Ishl (Rand64 i, int n) {
lua_assert(n > 0 && n < 32);
return packI((i.h << n) | (trim32(i.l) >> (32 - n)), i.l << n);
}
/* i1 ^= i2 */
static void Ixor (Rand64 *i1, Rand64 i2) {
i1->h ^= i2.h;
i1->l ^= i2.l;
}
/* return i1 + i2 */
static Rand64 Iadd (Rand64 i1, Rand64 i2) {
Rand64 result = packI(i1.h + i2.h, i1.l + i2.l);
if (trim32(result.l) < trim32(i1.l)) /* carry? */
result.h++;
return result;
}
/* return i * 5 */
static Rand64 times5 (Rand64 i) {
return Iadd(Ishl(i, 2), i); /* i * 5 == (i << 2) + i */
}
/* return i * 9 */
static Rand64 times9 (Rand64 i) {
return Iadd(Ishl(i, 3), i); /* i * 9 == (i << 3) + i */
}
/* return 'i' rotated left 'n' bits */
static Rand64 rotl (Rand64 i, int n) {
lua_assert(n > 0 && n < 32);
return packI((i.h << n) | (trim32(i.l) >> (32 - n)),
(trim32(i.h) >> (32 - n)) | (i.l << n));
}
/* for offsets larger than 32, rotate right by 64 - offset */
static Rand64 rotl1 (Rand64 i, int n) {
lua_assert(n > 32 && n < 64);
n = 64 - n;
return packI((trim32(i.h) >> n) | (i.l << (32 - n)),
(i.h << (32 - n)) | (trim32(i.l) >> n));
}
/*
** implementation of 'xoshiro256**' algorithm on 'Rand64' values
*/
static Rand64 nextrand (Rand64 *state) {
Rand64 res = times9(rotl(times5(state[1]), 7));
Rand64 t = Ishl(state[1], 17);
Ixor(&state[2], state[0]);
Ixor(&state[3], state[1]);
Ixor(&state[1], state[2]);
Ixor(&state[0], state[3]);
Ixor(&state[2], t);
state[3] = rotl1(state[3], 45);
return res;
}
/*
** Converts a 'Rand64' into a float.
*/
/* an unsigned 1 with proper type */
#define UONE ((lu_int32)1)
#if FIGS <= 32
/* 2^(-FIGS) */
#define scaleFIG (l_mathop(0.5) / (UONE << (FIGS - 1)))
/*
** get up to 32 bits from higher half, shifting right to
** throw out the extra bits.
*/
static lua_Number I2d (Rand64 x) {
lua_Number h = (lua_Number)(trim32(x.h) >> (32 - FIGS));
return h * scaleFIG;
}
#else /* 32 < FIGS <= 64 */
/* must take care to not shift stuff by more than 31 slots */
/* 2^(-FIGS) = 1.0 / 2^30 / 2^3 / 2^(FIGS-33) */
#define scaleFIG \
((lua_Number)1.0 / (UONE << 30) / 8.0 / (UONE << (FIGS - 33)))
/*
** use FIGS - 32 bits from lower half, throwing out the other
** (32 - (FIGS - 32)) = (64 - FIGS) bits
*/
#define shiftLOW (64 - FIGS)
/*
** higher 32 bits go after those (FIGS - 32) bits: shiftHI = 2^(FIGS - 32)
*/
#define shiftHI ((lua_Number)(UONE << (FIGS - 33)) * 2.0)
static lua_Number I2d (Rand64 x) {
lua_Number h = (lua_Number)trim32(x.h) * shiftHI;
lua_Number l = (lua_Number)(trim32(x.l) >> shiftLOW);
return (h + l) * scaleFIG;
}
#endif
/* convert a 'Rand64' to a 'lua_Unsigned' */
static lua_Unsigned I2UInt (Rand64 x) {
return ((lua_Unsigned)trim32(x.h) << 31 << 1) | (lua_Unsigned)trim32(x.l);
}
/* convert a 'lua_Unsigned' to a 'Rand64' */
static Rand64 Int2I (lua_Unsigned n) {
return packI((lu_int32)(n >> 31 >> 1), (lu_int32)n);
}
#endif /* } */
/*
** A state uses four 'Rand64' values.
*/
typedef struct {
Rand64 s[4];
} RanState;
/*
** Project the random integer 'ran' into the interval [0, n].
** Because 'ran' has 2^B possible values, the projection can only be
** uniform when the size of the interval is a power of 2 (exact
** division). Otherwise, to get a uniform projection into [0, n], we
** first compute 'lim', the smallest Mersenne number not smaller than
** 'n'. We then project 'ran' into the interval [0, lim]. If the result
** is inside [0, n], we are done. Otherwise, we try with another 'ran',
** until we have a result inside the interval.
*/
static lua_Unsigned project (lua_Unsigned ran, lua_Unsigned n,
RanState *state) {
if ((n & (n + 1)) == 0) /* is 'n + 1' a power of 2? */
return ran & n; /* no bias */
else {
lua_Unsigned lim = n;
/* compute the smallest (2^b - 1) not smaller than 'n' */
lim |= (lim >> 1);
lim |= (lim >> 2);
lim |= (lim >> 4);
lim |= (lim >> 8);
lim |= (lim >> 16);
#if (LUA_MAXUNSIGNED >> 31) >= 3
lim |= (lim >> 32); /* integer type has more than 32 bits */
#endif
lua_assert((lim & (lim + 1)) == 0 /* 'lim + 1' is a power of 2, */
&& lim >= n /* not smaller than 'n', */
&& (lim >> 1) < n); /* and it is the smallest one */
while ((ran &= lim) > n) /* project 'ran' into [0..lim] */
ran = I2UInt(nextrand(state->s)); /* not inside [0..n]? try again */
return ran;
}
}
static int math_random (lua_State *L) {
lua_Integer low, up;
lua_Unsigned p;
RanState *state = (RanState *)lua_touserdata(L, lua_upvalueindex(1));
Rand64 rv = nextrand(state->s); /* next pseudo-random value */
switch (lua_gettop(L)) { /* check number of arguments */
case 0: { /* no arguments */
lua_pushnumber(L, I2d(rv)); /* float between 0 and 1 */
return 1;
}
case 1: { /* only upper limit */
low = 1;
up = luaL_checkinteger(L, 1);
if (up == 0) { /* single 0 as argument? */
lua_pushinteger(L, I2UInt(rv)); /* full random integer */
return 1;
}
break;
}
case 2: { /* lower and upper limits */
low = luaL_checkinteger(L, 1);
up = luaL_checkinteger(L, 2);
break;
}
default: return luaL_error(L, "wrong number of arguments");
}
/* random integer in the interval [low, up] */
luaL_argcheck(L, low <= up, 1, "interval is empty");
/* project random integer into the interval [0, up - low] */
p = project(I2UInt(rv), (lua_Unsigned)up - (lua_Unsigned)low, state);
lua_pushinteger(L, p + (lua_Unsigned)low);
return 1;
}
static void setseed (lua_State *L, Rand64 *state,
lua_Unsigned n1, lua_Unsigned n2) {
int i;
state[0] = Int2I(n1);
state[1] = Int2I(0xff); /* avoid a zero state */
state[2] = Int2I(n2);
state[3] = Int2I(0);
for (i = 0; i < 16; i++)
nextrand(state); /* discard initial values to "spread" seed */
lua_pushinteger(L, n1);
lua_pushinteger(L, n2);
}
/*
** Set a "random" seed. To get some randomness, use the current time
** and the address of 'L' (in case the machine does address space layout
** randomization).
*/
static void randseed (lua_State *L, RanState *state) {
lua_Unsigned seed1 = (lua_Unsigned)time(NULL);
lua_Unsigned seed2 = (lua_Unsigned)(size_t)L;
setseed(L, state->s, seed1, seed2);
}
static int math_randomseed (lua_State *L) {
RanState *state = (RanState *)lua_touserdata(L, lua_upvalueindex(1));
if (lua_isnone(L, 1)) {
randseed(L, state);
}
else {
lua_Integer n1 = luaL_checkinteger(L, 1);
lua_Integer n2 = luaL_optinteger(L, 2, 0);
setseed(L, state->s, n1, n2);
}
return 2; /* return seeds */
}
static const luaL_Reg randfuncs[] = {
{"random", math_random},
{"randomseed", math_randomseed},
{NULL, NULL}
};
/*
** Register the random functions and initialize their state.
*/
static void setrandfunc (lua_State *L) {
RanState *state = (RanState *)lua_newuserdatauv(L, sizeof(RanState), 0);
randseed(L, state); /* initialize with a "random" seed */
lua_pop(L, 2); /* remove pushed seeds */
luaL_setfuncs(L, randfuncs, 1);
}
/* }================================================================== */
/*
** {==================================================================
** Deprecated functions (for compatibility only)
** ===================================================================
*/
#if defined(LUA_COMPAT_MATHLIB)
static int math_cosh (lua_State *L) {
lua_pushnumber(L, l_mathop(cosh)(luaL_checknumber(L, 1)));
return 1;
}
static int math_sinh (lua_State *L) {
lua_pushnumber(L, l_mathop(sinh)(luaL_checknumber(L, 1)));
return 1;
}
static int math_tanh (lua_State *L) {
lua_pushnumber(L, l_mathop(tanh)(luaL_checknumber(L, 1)));
return 1;
}
static int math_pow (lua_State *L) {
lua_Number x = luaL_checknumber(L, 1);
lua_Number y = luaL_checknumber(L, 2);
lua_pushnumber(L, l_mathop(pow)(x, y));
return 1;
}
static int math_frexp (lua_State *L) {
int e;
lua_pushnumber(L, l_mathop(frexp)(luaL_checknumber(L, 1), &e));
lua_pushinteger(L, e);
return 2;
}
static int math_ldexp (lua_State *L) {
lua_Number x = luaL_checknumber(L, 1);
int ep = (int)luaL_checkinteger(L, 2);
lua_pushnumber(L, l_mathop(ldexp)(x, ep));
return 1;
}
static int math_log10 (lua_State *L) {
lua_pushnumber(L, l_mathop(log10)(luaL_checknumber(L, 1)));
return 1;
}
#endif
/* }================================================================== */
static const luaL_Reg mathlib[] = {
{"abs", math_abs},
{"acos", math_acos},
{"asin", math_asin},
{"atan", math_atan},
{"ceil", math_ceil},
{"cos", math_cos},
{"deg", math_deg},
{"exp", math_exp},
{"tointeger", math_toint},
{"floor", math_floor},
{"fmod", math_fmod},
{"ult", math_ult},
{"log", math_log},
{"max", math_max},
{"min", math_min},
{"modf", math_modf},
{"rad", math_rad},
{"sin", math_sin},
{"sqrt", math_sqrt},
{"tan", math_tan},
{"type", math_type},
#if defined(LUA_COMPAT_MATHLIB)
{"atan2", math_atan},
{"cosh", math_cosh},
{"sinh", math_sinh},
{"tanh", math_tanh},
{"pow", math_pow},
{"frexp", math_frexp},
{"ldexp", math_ldexp},
{"log10", math_log10},
#endif
/* placeholders */
{"random", NULL},
{"randomseed", NULL},
{"pi", NULL},
{"huge", NULL},
{"maxinteger", NULL},
{"mininteger", NULL},
{NULL, NULL}
};
/*
** Open math library
*/
LUAMOD_API int luaopen_math (lua_State *L) {
luaL_newlib(L, mathlib);
lua_pushnumber(L, PI);
lua_setfield(L, -2, "pi");
lua_pushnumber(L, (lua_Number)HUGE_VAL);
lua_setfield(L, -2, "huge");
lua_pushinteger(L, LUA_MAXINTEGER);
lua_setfield(L, -2, "maxinteger");
lua_pushinteger(L, LUA_MININTEGER);
lua_setfield(L, -2, "mininteger");
setrandfunc(L);
return 1;
}
LMEM¶
/*
** $Id: lmem.h $
** Interface to Memory Manager
** See Copyright Notice in lua.h
*/
#ifndef lmem_h
#define lmem_h
#include <stddef.h>
#include "llimits.h"
#include "lua.h"
#include "_native_lua_config.h" /* native Lua */
#define luaM_error(L) luaD_throw(L, LUA_ERRMEM)
/*
** This macro tests whether it is safe to multiply 'n' by the size of
** type 't' without overflows. Because 'e' is always constant, it avoids
** the runtime division MAX_SIZET/(e).
** (The macro is somewhat complex to avoid warnings: The 'sizeof'
** comparison avoids a runtime comparison when overflow cannot occur.
** The compiler should be able to optimize the real test by itself, but
** when it does it, it may give a warning about "comparison is always
** false due to limited range of data type"; the +1 tricks the compiler,
** avoiding this warning but also this optimization.)
*/
#define luaM_testsize(n,e) \
(sizeof(n) >= sizeof(size_t) && cast_sizet((n)) + 1 > MAX_SIZET/(e))
#define luaM_checksize(L,n,e) \
(luaM_testsize(n,e) ? luaM_toobig(L) : cast_void(0))
/*
** Computes the minimum between 'n' and 'MAX_SIZET/sizeof(t)', so that
** the result is not larger than 'n' and cannot overflow a 'size_t'
** when multiplied by the size of type 't'. (Assumes that 'n' is an
** 'int' or 'unsigned int' and that 'int' is not larger than 'size_t'.)
*/
#define luaM_limitN(n,t) \
((cast_sizet(n) <= MAX_SIZET/sizeof(t)) ? (n) : \
cast_uint((MAX_SIZET/sizeof(t))))
/*
** Arrays of chars do not need any test
*/
#define luaM_reallocvchar(L,b,on,n) \
cast_charp(luaM_saferealloc_(L, (b), (on)*sizeof(char), (n)*sizeof(char)))
#define luaM_freemem(L, b, s) luaM_free_(L, (b), (s))
#define luaM_free(L, b) luaM_free_(L, (b), sizeof(*(b)))
#define luaM_freearray(L, b, n) luaM_free_(L, (b), (n)*sizeof(*(b)))
#define luaM_new(L,t) cast(t*, luaM_malloc_(L, sizeof(t), 0))
#define luaM_newvector(L,n,t) cast(t*, luaM_malloc_(L, (n)*sizeof(t), 0))
#define luaM_newvectorchecked(L,n,t) \
(luaM_checksize(L,n,sizeof(t)), luaM_newvector(L,n,t))
#define luaM_newobject(L,tag,s) luaM_malloc_(L, (s), tag)
#define luaM_growvector(L,v,nelems,size,t,limit,e) \
((v)=cast(t *, luaM_growaux_(L,v,nelems,&(size),sizeof(t), \
luaM_limitN(limit,t),e)))
#define luaM_reallocvector(L, v,oldn,n,t) \
(cast(t *, luaM_realloc_(L, v, cast_sizet(oldn) * sizeof(t), \
cast_sizet(n) * sizeof(t))))
#define luaM_shrinkvector(L,v,size,fs,t) \
((v)=cast(t *, luaM_shrinkvector_(L, v, &(size), fs, sizeof(t))))
LUAI_FUNC l_noret luaM_toobig (lua_State *L);
/* not to be called directly */
LUAI_FUNC void *luaM_realloc_ (lua_State *L, void *block, size_t oldsize,
size_t size);
LUAI_FUNC void *luaM_saferealloc_ (lua_State *L, void *block, size_t oldsize,
size_t size);
LUAI_FUNC void luaM_free_ (lua_State *L, void *block, size_t osize);
LUAI_FUNC void *luaM_growaux_ (lua_State *L, void *block, int nelems,
int *size, int size_elem, int limit,
const char *what);
LUAI_FUNC void *luaM_shrinkvector_ (lua_State *L, void *block, int *nelem,
int final_n, int size_elem);
LUAI_FUNC void *luaM_malloc_ (lua_State *L, size_t size, int tag);
#endif
/*
** $Id: lmem.c $
** Interface to Memory Manager
** See Copyright Notice in lua.h
*/
#define lmem_c
#define LUA_CORE
#include "lprefix.h"
#include <stddef.h>
#include "lua.h"
#include "ldebug.h"
#include "ldo.h"
#include "lgc.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
#if defined(HARDMEMTESTS)
/*
** First allocation will fail whenever not building initial state
** and not shrinking a block. (This fail will trigger 'tryagain' and
** a full GC cycle at every allocation.)
*/
static void *firsttry (global_State *g, void *block, size_t os, size_t ns) {
if (ttisnil(&g->nilvalue) && ns > os)
return NULL; /* fail */
else /* normal allocation */
return (*g->frealloc)(g->ud, block, os, ns);
}
#else
#define firsttry(g,block,os,ns) ((*g->frealloc)(g->ud, block, os, ns))
#endif
/*
** About the realloc function:
** void *frealloc (void *ud, void *ptr, size_t osize, size_t nsize);
** ('osize' is the old size, 'nsize' is the new size)
**
** - frealloc(ud, p, x, 0) frees the block 'p' and returns NULL.
** Particularly, frealloc(ud, NULL, 0, 0) does nothing,
** which is equivalent to free(NULL) in ISO C.
**
** - frealloc(ud, NULL, x, s) creates a new block of size 's'
** (no matter 'x'). Returns NULL if it cannot create the new block.
**
** - otherwise, frealloc(ud, b, x, y) reallocates the block 'b' from
** size 'x' to size 'y'. Returns NULL if it cannot reallocate the
** block to the new size.
*/
/*
** {==================================================================
** Functions to allocate/deallocate arrays for the Parser
** ===================================================================
*/
/*
** Minimum size for arrays during parsing, to avoid overhead of
** reallocating to size 1, then 2, and then 4. All these arrays
** will be reallocated to exact sizes or erased when parsing ends.
*/
#define MINSIZEARRAY 4
void *luaM_growaux_ (lua_State *L, void *block, int nelems, int *psize,
int size_elems, int limit, const char *what) {
void *newblock;
int size = *psize;
if (nelems + 1 <= size) /* does one extra element still fit? */
return block; /* nothing to be done */
if (size >= limit / 2) { /* cannot double it? */
if (unlikely(size >= limit)) /* cannot grow even a little? */
luaG_runerror(L, "too many %s (limit is %d)", what, limit);
size = limit; /* still have at least one free place */
}
else {
size *= 2;
if (size < MINSIZEARRAY)
size = MINSIZEARRAY; /* minimum size */
}
lua_assert(nelems + 1 <= size && size <= limit);
/* 'limit' ensures that multiplication will not overflow */
newblock = luaM_saferealloc_(L, block, cast_sizet(*psize) * size_elems,
cast_sizet(size) * size_elems);
*psize = size; /* update only when everything else is OK */
return newblock;
}
/*
** In prototypes, the size of the array is also its number of
** elements (to save memory). So, if it cannot shrink an array
** to its number of elements, the only option is to raise an
** error.
*/
void *luaM_shrinkvector_ (lua_State *L, void *block, int *size,
int final_n, int size_elem) {
void *newblock;
size_t oldsize = cast_sizet((*size) * size_elem);
size_t newsize = cast_sizet(final_n * size_elem);
lua_assert(newsize <= oldsize);
newblock = luaM_saferealloc_(L, block, oldsize, newsize);
*size = final_n;
return newblock;
}
/* }================================================================== */
l_noret luaM_toobig (lua_State *L) {
luaG_runerror(L, "memory allocation error: block too big");
}
/*
** Free memory
*/
void luaM_free_ (lua_State *L, void *block, size_t osize) {
global_State *g = G(L);
lua_assert((osize == 0) == (block == NULL));
(*g->frealloc)(g->ud, block, osize, 0);
g->GCdebt -= osize;
}
/*
** In case of allocation fail, this function will call the GC to try
** to free some memory and then try the allocation again.
** (It should not be called when shrinking a block, because then the
** interpreter may be in the middle of a collection step.)
*/
static void *tryagain (lua_State *L, void *block,
size_t osize, size_t nsize) {
global_State *g = G(L);
if (ttisnil(&g->nilvalue)) { /* is state fully build? */
luaC_fullgc(L, 1); /* try to free some memory... */
return (*g->frealloc)(g->ud, block, osize, nsize); /* try again */
}
else return NULL; /* cannot free any memory without a full state */
}
/*
** Generic allocation routine.
** If allocation fails while shrinking a block, do not try again; the
** GC shrinks some blocks and it is not reentrant.
*/
void *luaM_realloc_ (lua_State *L, void *block, size_t osize, size_t nsize) {
void *newblock;
global_State *g = G(L);
lua_assert((osize == 0) == (block == NULL));
newblock = firsttry(g, block, osize, nsize);
if (unlikely(newblock == NULL && nsize > 0)) {
if (nsize > osize) /* not shrinking a block? */
newblock = tryagain(L, block, osize, nsize);
if (newblock == NULL) /* still no memory? */
return NULL; /* do not update 'GCdebt' */
}
lua_assert((nsize == 0) == (newblock == NULL));
g->GCdebt = (g->GCdebt + nsize) - osize;
return newblock;
}
void *luaM_saferealloc_ (lua_State *L, void *block, size_t osize,
size_t nsize) {
void *newblock = luaM_realloc_(L, block, osize, nsize);
if (unlikely(newblock == NULL && nsize > 0)) /* allocation failed? */
luaM_error(L);
return newblock;
}
void *luaM_malloc_ (lua_State *L, size_t size, int tag) {
if (size == 0)
return NULL; /* that's all */
else {
global_State *g = G(L);
void *newblock = firsttry(g, NULL, tag, size);
if (unlikely(newblock == NULL)) {
newblock = tryagain(L, NULL, tag, size);
if (newblock == NULL)
luaM_error(L);
}
g->GCdebt += size;
return newblock;
}
}
LOADLIB¶
/*
** $Id: loadlib.c $
** Dynamic library loader for Lua
** See Copyright Notice in lua.h
**
** This module contains an implementation of loadlib for Unix systems
** that have dlfcn, an implementation for Windows, and a stub for other
** systems.
*/
#define loadlib_c
#define LUA_LIB
#include "lprefix.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "_native_lua_config.h" /* native Lua */
/*
** LUA_IGMARK is a mark to ignore all before it when building the
** luaopen_ function name.
*/
#if !defined (LUA_IGMARK)
#define LUA_IGMARK "-"
#endif
/*
** LUA_CSUBSEP is the character that replaces dots in submodule names
** when searching for a C loader.
** LUA_LSUBSEP is the character that replaces dots in submodule names
** when searching for a Lua loader.
*/
#if !defined(LUA_CSUBSEP)
#define LUA_CSUBSEP LUA_DIRSEP
#endif
#if !defined(LUA_LSUBSEP)
#define LUA_LSUBSEP LUA_DIRSEP
#endif
/* prefix for open functions in C libraries */
#define LUA_POF "luaopen_"
/* separator for open functions in C libraries */
#define LUA_OFSEP "_"
/*
** key for table in the registry that keeps handles
** for all loaded C libraries
*/
static const char *const CLIBS = "_CLIBS";
#define LIB_FAIL "open"
#define setprogdir(L) ((void)0)
/*
** Special type equivalent to '(void*)' for functions in gcc
** (to suppress warnings when converting function pointers)
*/
typedef void (*voidf)(void);
/*
** system-dependent functions
*/
/*
** unload library 'lib'
*/
static void lsys_unloadlib (void *lib);
/*
** load C library in file 'path'. If 'seeglb', load with all names in
** the library global.
** Returns the library; in case of error, returns NULL plus an
** error string in the stack.
*/
static void *lsys_load (lua_State *L, const char *path, int seeglb);
/*
** Try to find a function named 'sym' in library 'lib'.
** Returns the function; in case of error, returns NULL plus an
** error string in the stack.
*/
static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym);
#if defined(LUA_USE_DLOPEN) /* { */
/*
** {========================================================================
** This is an implementation of loadlib based on the dlfcn interface.
** The dlfcn interface is available in Linux, SunOS, Solaris, IRIX, FreeBSD,
** NetBSD, AIX 4.2, HPUX 11, and probably most other Unix flavors, at least
** as an emulation layer on top of native functions.
** =========================================================================
*/
#include <dlfcn.h>
/*
** Macro to convert pointer-to-void* to pointer-to-function. This cast
** is undefined according to ISO C, but POSIX assumes that it works.
** (The '__extension__' in gnu compilers is only to avoid warnings.)
*/
#if defined(__GNUC__)
#define cast_func(p) (__extension__ (lua_CFunction)(p))
#else
#define cast_func(p) ((lua_CFunction)(p))
#endif
static void lsys_unloadlib (void *lib) {
dlclose(lib);
}
static void *lsys_load (lua_State *L, const char *path, int seeglb) {
void *lib = dlopen(path, RTLD_NOW | (seeglb ? RTLD_GLOBAL : RTLD_LOCAL));
if (lib == NULL) lua_pushstring(L, dlerror());
return lib;
}
static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) {
lua_CFunction f = cast_func(dlsym(lib, sym));
if (f == NULL) lua_pushstring(L, dlerror());
return f;
}
/* }====================================================== */
#elif defined(LUA_DL_DLL) /* }{ */
/*
** {======================================================================
** This is an implementation of loadlib for Windows using native functions.
** =======================================================================
*/
#include <windows.h>
/*
** optional flags for LoadLibraryEx
*/
#if !defined(LUA_LLE_FLAGS)
#define LUA_LLE_FLAGS 0
#endif
#undef setprogdir
/*
** Replace in the path (on the top of the stack) any occurrence
** of LUA_EXEC_DIR with the executable's path.
*/
static void setprogdir (lua_State *L) {
char buff[MAX_PATH + 1];
char *lb;
DWORD nsize = sizeof(buff)/sizeof(char);
DWORD n = GetModuleFileNameA(NULL, buff, nsize); /* get exec. name */
if (n == 0 || n == nsize || (lb = strrchr(buff, '\\')) == NULL)
luaL_error(L, "unable to get ModuleFileName");
else {
*lb = '\0'; /* cut name on the last '\\' to get the path */
luaL_gsub(L, lua_tostring(L, -1), LUA_EXEC_DIR, buff);
lua_remove(L, -2); /* remove original string */
}
}
static void pusherror (lua_State *L) {
int error = GetLastError();
char buffer[128];
if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM,
NULL, error, 0, buffer, sizeof(buffer)/sizeof(char), NULL))
lua_pushstring(L, buffer);
else
lua_pushfstring(L, "system error %d\n", error);
}
static void lsys_unloadlib (void *lib) {
FreeLibrary((HMODULE)lib);
}
static void *lsys_load (lua_State *L, const char *path, int seeglb) {
HMODULE lib = LoadLibraryExA(path, NULL, LUA_LLE_FLAGS);
(void)(seeglb); /* not used: symbols are 'global' by default */
if (lib == NULL) pusherror(L);
return lib;
}
static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) {
lua_CFunction f = (lua_CFunction)(voidf)GetProcAddress((HMODULE)lib, sym);
if (f == NULL) pusherror(L);
return f;
}
/* }====================================================== */
#else /* }{ */
/*
** {======================================================
** Fallback for other systems
** =======================================================
*/
#undef LIB_FAIL
#define LIB_FAIL "absent"
#define DLMSG "dynamic libraries not enabled; check your Lua installation"
static void lsys_unloadlib (void *lib) {
(void)(lib); /* not used */
}
static void *lsys_load (lua_State *L, const char *path, int seeglb) {
(void)(path); (void)(seeglb); /* not used */
lua_pushliteral(L, DLMSG);
return NULL;
}
static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) {
(void)(lib); (void)(sym); /* not used */
lua_pushliteral(L, DLMSG);
return NULL;
}
/* }====================================================== */
#endif /* } */
/*
** {==================================================================
** Set Paths
** ===================================================================
*/
/*
** LUA_PATH_VAR and LUA_CPATH_VAR are the names of the environment
** variables that Lua check to set its paths.
*/
#if !defined(LUA_PATH_VAR)
#define LUA_PATH_VAR "LUA_PATH"
#endif
#if !defined(LUA_CPATH_VAR)
#define LUA_CPATH_VAR "LUA_CPATH"
#endif
/*
** return registry.LUA_NOENV as a boolean
*/
static int noenv (lua_State *L) {
int b;
lua_getfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");
b = lua_toboolean(L, -1);
lua_pop(L, 1); /* remove value */
return b;
}
/*
** Set a path
*/
static void setpath (lua_State *L, const char *fieldname,
const char *envname,
const char *dft) {
const char *dftmark;
const char *nver = lua_pushfstring(L, "%s%s", envname, LUA_VERSUFFIX);
const char *path = getenv(nver); /* try versioned name */
if (path == NULL) /* no versioned environment variable? */
path = getenv(envname); /* try unversioned name */
if (path == NULL || noenv(L)) /* no environment variable? */
lua_pushstring(L, dft); /* use default */
else if ((dftmark = strstr(path, LUA_PATH_SEP LUA_PATH_SEP)) == NULL)
lua_pushstring(L, path); /* nothing to change */
else { /* path contains a ";;": insert default path in its place */
size_t len = strlen(path);
luaL_Buffer b;
luaL_buffinit(L, &b);
if (path < dftmark) { /* is there a prefix before ';;'? */
luaL_addlstring(&b, path, dftmark - path); /* add it */
luaL_addchar(&b, *LUA_PATH_SEP);
}
luaL_addstring(&b, dft); /* add default */
if (dftmark < path + len - 2) { /* is there a suffix after ';;'? */
luaL_addchar(&b, *LUA_PATH_SEP);
luaL_addlstring(&b, dftmark + 2, (path + len - 2) - dftmark);
}
luaL_pushresult(&b);
}
setprogdir(L);
lua_setfield(L, -3, fieldname); /* package[fieldname] = path value */
lua_pop(L, 1); /* pop versioned variable name ('nver') */
}
/* }================================================================== */
/*
** return registry.CLIBS[path]
*/
static void *checkclib (lua_State *L, const char *path) {
void *plib;
lua_getfield(L, LUA_REGISTRYINDEX, CLIBS);
lua_getfield(L, -1, path);
plib = lua_touserdata(L, -1); /* plib = CLIBS[path] */
lua_pop(L, 2); /* pop CLIBS table and 'plib' */
return plib;
}
/*
** registry.CLIBS[path] = plib -- for queries
** registry.CLIBS[#CLIBS + 1] = plib -- also keep a list of all libraries
*/
static void addtoclib (lua_State *L, const char *path, void *plib) {
lua_getfield(L, LUA_REGISTRYINDEX, CLIBS);
lua_pushlightuserdata(L, plib);
lua_pushvalue(L, -1);
lua_setfield(L, -3, path); /* CLIBS[path] = plib */
lua_rawseti(L, -2, luaL_len(L, -2) + 1); /* CLIBS[#CLIBS + 1] = plib */
lua_pop(L, 1); /* pop CLIBS table */
}
/*
** __gc tag method for CLIBS table: calls 'lsys_unloadlib' for all lib
** handles in list CLIBS
*/
static int gctm (lua_State *L) {
lua_Integer n = luaL_len(L, 1);
for (; n >= 1; n--) { /* for each handle, in reverse order */
lua_rawgeti(L, 1, n); /* get handle CLIBS[n] */
lsys_unloadlib(lua_touserdata(L, -1));
lua_pop(L, 1); /* pop handle */
}
return 0;
}
/* error codes for 'lookforfunc' */
#define ERRLIB 1
#define ERRFUNC 2
/*
** Look for a C function named 'sym' in a dynamically loaded library
** 'path'.
** First, check whether the library is already loaded; if not, try
** to load it.
** Then, if 'sym' is '*', return true (as library has been loaded).
** Otherwise, look for symbol 'sym' in the library and push a
** C function with that symbol.
** Return 0 and 'true' or a function in the stack; in case of
** errors, return an error code and an error message in the stack.
*/
static int lookforfunc (lua_State *L, const char *path, const char *sym) {
void *reg = checkclib(L, path); /* check loaded C libraries */
if (reg == NULL) { /* must load library? */
reg = lsys_load(L, path, *sym == '*'); /* global symbols if 'sym'=='*' */
if (reg == NULL) return ERRLIB; /* unable to load library */
addtoclib(L, path, reg);
}
if (*sym == '*') { /* loading only library (no function)? */
lua_pushboolean(L, 1); /* return 'true' */
return 0; /* no errors */
}
else {
lua_CFunction f = lsys_sym(L, reg, sym);
if (f == NULL)
return ERRFUNC; /* unable to find function */
lua_pushcfunction(L, f); /* else create new function */
return 0; /* no errors */
}
}
static int ll_loadlib (lua_State *L) {
const char *path = luaL_checkstring(L, 1);
const char *init = luaL_checkstring(L, 2);
int stat = lookforfunc(L, path, init);
if (stat == 0) /* no errors? */
return 1; /* return the loaded function */
else { /* error; error message is on stack top */
luaL_pushfail(L);
lua_insert(L, -2);
lua_pushstring(L, (stat == ERRLIB) ? LIB_FAIL : "init");
return 3; /* return fail, error message, and where */
}
}
/*
** {======================================================
** 'require' function
** =======================================================
*/
static int readable (const char *filename) {
FILE *f = fopen(filename, "r"); /* try to open file */
if (f == NULL) return 0; /* open failed */
fclose(f);
return 1;
}
/*
** Get the next name in '*path' = 'name1;name2;name3;...', changing
** the ending ';' to '\0' to create a zero-terminated string. Return
** NULL when list ends.
*/
static const char *getnextfilename (char **path, char *end) {
char *sep;
char *name = *path;
if (name == end)
return NULL; /* no more names */
else if (*name == '\0') { /* from previous iteration? */
*name = *LUA_PATH_SEP; /* restore separator */
name++; /* skip it */
}
sep = strchr(name, *LUA_PATH_SEP); /* find next separator */
if (sep == NULL) /* separator not found? */
sep = end; /* name goes until the end */
*sep = '\0'; /* finish file name */
*path = sep; /* will start next search from here */
return name;
}
/*
** Given a path such as ";blabla.so;blublu.so", pushes the string
**
** no file 'blabla.so'
** no file 'blublu.so'
*/
static void pusherrornotfound (lua_State *L, const char *path) {
luaL_Buffer b;
luaL_buffinit(L, &b);
luaL_addstring(&b, "no file '");
luaL_addgsub(&b, path, LUA_PATH_SEP, "'\n\tno file '");
luaL_addstring(&b, "'");
luaL_pushresult(&b);
}
static const char *searchpath (lua_State *L, const char *name,
const char *path,
const char *sep,
const char *dirsep) {
luaL_Buffer buff;
char *pathname; /* path with name inserted */
char *endpathname; /* its end */
const char *filename;
/* separator is non-empty and appears in 'name'? */
if (*sep != '\0' && strchr(name, *sep) != NULL)
name = luaL_gsub(L, name, sep, dirsep); /* replace it by 'dirsep' */
luaL_buffinit(L, &buff);
/* add path to the buffer, replacing marks ('?') with the file name */
luaL_addgsub(&buff, path, LUA_PATH_MARK, name);
luaL_addchar(&buff, '\0');
pathname = luaL_buffaddr(&buff); /* writable list of file names */
endpathname = pathname + luaL_bufflen(&buff) - 1;
while ((filename = getnextfilename(&pathname, endpathname)) != NULL) {
if (readable(filename)) /* does file exist and is readable? */
return lua_pushstring(L, filename); /* save and return name */
}
luaL_pushresult(&buff); /* push path to create error message */
pusherrornotfound(L, lua_tostring(L, -1)); /* create error message */
return NULL; /* not found */
}
static int ll_searchpath (lua_State *L) {
const char *f = searchpath(L, luaL_checkstring(L, 1),
luaL_checkstring(L, 2),
luaL_optstring(L, 3, "."),
luaL_optstring(L, 4, LUA_DIRSEP));
if (f != NULL) return 1;
else { /* error message is on top of the stack */
luaL_pushfail(L);
lua_insert(L, -2);
return 2; /* return fail + error message */
}
}
static const char *findfile (lua_State *L, const char *name,
const char *pname,
const char *dirsep) {
const char *path;
lua_getfield(L, lua_upvalueindex(1), pname);
path = lua_tostring(L, -1);
if (path == NULL)
luaL_error(L, "'package.%s' must be a string", pname);
return searchpath(L, name, path, ".", dirsep);
}
static int checkload (lua_State *L, int stat, const char *filename) {
if (stat) { /* module loaded successfully? */
lua_pushstring(L, filename); /* will be 2nd argument to module */
return 2; /* return open function and file name */
}
else
return luaL_error(L, "error loading module '%s' from file '%s':\n\t%s",
lua_tostring(L, 1), filename, lua_tostring(L, -1));
}
static int searcher_Lua (lua_State *L) {
const char *filename;
const char *name = luaL_checkstring(L, 1);
filename = findfile(L, name, "path", LUA_LSUBSEP);
if (filename == NULL) return 1; /* module not found in this path */
return checkload(L, (luaL_loadfile(L, filename) == LUA_OK), filename);
}
/*
** Try to find a load function for module 'modname' at file 'filename'.
** First, change '.' to '_' in 'modname'; then, if 'modname' has
** the form X-Y (that is, it has an "ignore mark"), build a function
** name "luaopen_X" and look for it. (For compatibility, if that
** fails, it also tries "luaopen_Y".) If there is no ignore mark,
** look for a function named "luaopen_modname".
*/
static int loadfunc (lua_State *L, const char *filename, const char *modname) {
const char *openfunc;
const char *mark;
modname = luaL_gsub(L, modname, ".", LUA_OFSEP);
mark = strchr(modname, *LUA_IGMARK);
if (mark) {
int stat;
openfunc = lua_pushlstring(L, modname, mark - modname);
openfunc = lua_pushfstring(L, LUA_POF"%s", openfunc);
stat = lookforfunc(L, filename, openfunc);
if (stat != ERRFUNC) return stat;
modname = mark + 1; /* else go ahead and try old-style name */
}
openfunc = lua_pushfstring(L, LUA_POF"%s", modname);
return lookforfunc(L, filename, openfunc);
}
static int searcher_C (lua_State *L) {
const char *name = luaL_checkstring(L, 1);
const char *filename = findfile(L, name, "cpath", LUA_CSUBSEP);
if (filename == NULL) return 1; /* module not found in this path */
return checkload(L, (loadfunc(L, filename, name) == 0), filename);
}
static int searcher_Croot (lua_State *L) {
const char *filename;
const char *name = luaL_checkstring(L, 1);
const char *p = strchr(name, '.');
int stat;
if (p == NULL) return 0; /* is root */
lua_pushlstring(L, name, p - name);
filename = findfile(L, lua_tostring(L, -1), "cpath", LUA_CSUBSEP);
if (filename == NULL) return 1; /* root not found */
if ((stat = loadfunc(L, filename, name)) != 0) {
if (stat != ERRFUNC)
return checkload(L, 0, filename); /* real error */
else { /* open function not found */
lua_pushfstring(L, "no module '%s' in file '%s'", name, filename);
return 1;
}
}
lua_pushstring(L, filename); /* will be 2nd argument to module */
return 2;
}
static int searcher_preload (lua_State *L) {
const char *name = luaL_checkstring(L, 1);
lua_getfield(L, LUA_REGISTRYINDEX, LUA_PRELOAD_TABLE);
if (lua_getfield(L, -1, name) == LUA_TNIL) { /* not found? */
lua_pushfstring(L, "no field package.preload['%s']", name);
return 1;
}
else {
lua_pushliteral(L, ":preload:");
return 2;
}
}
static void findloader (lua_State *L, const char *name) {
int i;
luaL_Buffer msg; /* to build error message */
/* push 'package.searchers' to index 3 in the stack */
if (lua_getfield(L, lua_upvalueindex(1), "searchers") != LUA_TTABLE)
luaL_error(L, "'package.searchers' must be a table");
luaL_buffinit(L, &msg);
/* iterate over available searchers to find a loader */
for (i = 1; ; i++) {
luaL_addstring(&msg, "\n\t"); /* error-message prefix */
if (lua_rawgeti(L, 3, i) == LUA_TNIL) { /* no more searchers? */
lua_pop(L, 1); /* remove nil */
luaL_buffsub(&msg, 2); /* remove prefix */
luaL_pushresult(&msg); /* create error message */
luaL_error(L, "module '%s' not found:%s", name, lua_tostring(L, -1));
}
lua_pushstring(L, name);
lua_call(L, 1, 2); /* call it */
if (lua_isfunction(L, -2)) /* did it find a loader? */
return; /* module loader found */
else if (lua_isstring(L, -2)) { /* searcher returned error message? */
lua_pop(L, 1); /* remove extra return */
luaL_addvalue(&msg); /* concatenate error message */
}
else { /* no error message */
lua_pop(L, 2); /* remove both returns */
luaL_buffsub(&msg, 2); /* remove prefix */
}
}
}
static int ll_require (lua_State *L) {
const char *name = luaL_checkstring(L, 1);
lua_settop(L, 1); /* LOADED table will be at index 2 */
lua_getfield(L, LUA_REGISTRYINDEX, LUA_LOADED_TABLE);
lua_getfield(L, 2, name); /* LOADED[name] */
if (lua_toboolean(L, -1)) /* is it there? */
return 1; /* package is already loaded */
/* else must load package */
lua_pop(L, 1); /* remove 'getfield' result */
findloader(L, name);
lua_rotate(L, -2, 1); /* function <-> loader data */
lua_pushvalue(L, 1); /* name is 1st argument to module loader */
lua_pushvalue(L, -3); /* loader data is 2nd argument */
/* stack: ...; loader data; loader function; mod. name; loader data */
lua_call(L, 2, 1); /* run loader to load module */
/* stack: ...; loader data; result from loader */
if (!lua_isnil(L, -1)) /* non-nil return? */
lua_setfield(L, 2, name); /* LOADED[name] = returned value */
else
lua_pop(L, 1); /* pop nil */
if (lua_getfield(L, 2, name) == LUA_TNIL) { /* module set no value? */
lua_pushboolean(L, 1); /* use true as result */
lua_copy(L, -1, -2); /* replace loader result */
lua_setfield(L, 2, name); /* LOADED[name] = true */
}
lua_rotate(L, -2, 1); /* loader data <-> module result */
return 2; /* return module result and loader data */
}
/* }====================================================== */
static const luaL_Reg pk_funcs[] = {
{"loadlib", ll_loadlib},
{"searchpath", ll_searchpath},
/* placeholders */
{"preload", NULL},
{"cpath", NULL},
{"path", NULL},
{"searchers", NULL},
{"loaded", NULL},
{NULL, NULL}
};
static const luaL_Reg ll_funcs[] = {
{"require", ll_require},
{NULL, NULL}
};
static void createsearcherstable (lua_State *L) {
static const lua_CFunction searchers[] =
{searcher_preload, searcher_Lua, searcher_C, searcher_Croot, NULL};
int i;
/* create 'searchers' table */
lua_createtable(L, sizeof(searchers)/sizeof(searchers[0]) - 1, 0);
/* fill it with predefined searchers */
for (i=0; searchers[i] != NULL; i++) {
lua_pushvalue(L, -2); /* set 'package' as upvalue for all searchers */
lua_pushcclosure(L, searchers[i], 1);
lua_rawseti(L, -2, i+1);
}
lua_setfield(L, -2, "searchers"); /* put it in field 'searchers' */
}
/*
** create table CLIBS to keep track of loaded C libraries,
** setting a finalizer to close all libraries when closing state.
*/
static void createclibstable (lua_State *L) {
luaL_getsubtable(L, LUA_REGISTRYINDEX, CLIBS); /* create CLIBS table */
lua_createtable(L, 0, 1); /* create metatable for CLIBS */
lua_pushcfunction(L, gctm);
lua_setfield(L, -2, "__gc"); /* set finalizer for CLIBS table */
lua_setmetatable(L, -2);
}
LUAMOD_API int luaopen_package (lua_State *L) {
createclibstable(L);
luaL_newlib(L, pk_funcs); /* create 'package' table */
createsearcherstable(L);
/* set paths */
setpath(L, "path", LUA_PATH_VAR, LUA_PATH_DEFAULT);
setpath(L, "cpath", LUA_CPATH_VAR, LUA_CPATH_DEFAULT);
/* store config information */
lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATH_SEP "\n" LUA_PATH_MARK "\n"
LUA_EXEC_DIR "\n" LUA_IGMARK "\n");
lua_setfield(L, -2, "config");
/* set field 'loaded' */
luaL_getsubtable(L, LUA_REGISTRYINDEX, LUA_LOADED_TABLE);
lua_setfield(L, -2, "loaded");
/* set field 'preload' */
luaL_getsubtable(L, LUA_REGISTRYINDEX, LUA_PRELOAD_TABLE);
lua_setfield(L, -2, "preload");
lua_pushglobaltable(L);
lua_pushvalue(L, -2); /* set 'package' as upvalue for next lib */
luaL_setfuncs(L, ll_funcs, 1); /* open lib into global table */
lua_pop(L, 1); /* pop global table */
return 1; /* return 'package' table */
}
LOBJECT¶
/*
** $Id: lobject.h $
** Type definitions for Lua objects
** See Copyright Notice in lua.h
*/
#ifndef lobject_h
#define lobject_h
#include <stdarg.h>
#include "llimits.h"
#include "lua.h"
#include "_native_lua_config.h" /* native Lua */
/*
** Extra types for collectable non-values
*/
#define LUA_TUPVAL LUA_NUMTYPES /* upvalues */
#define LUA_TPROTO (LUA_NUMTYPES+1) /* function prototypes */
/*
** number of all possible types (including LUA_TNONE)
*/
#define LUA_TOTALTYPES (LUA_TPROTO + 2)
/*
** tags for Tagged Values have the following use of bits:
** bits 0-3: actual tag (a LUA_T* constant)
** bits 4-5: variant bits
** bit 6: whether value is collectable
*/
/* add variant bits to a type */
#define makevariant(t,v) ((t) | ((v) << 4))
/*
** Union of all Lua values
*/
typedef union Value {
struct GCObject *gc; /* collectable objects */
void *p; /* light userdata */
lua_CFunction f; /* light C functions */
lua_Integer i; /* integer numbers */
lua_Number n; /* float numbers */
} Value;
/*
** Tagged Values. This is the basic representation of values in Lua:
** an actual value plus a tag with its type.
*/
#define TValuefields Value value_; lu_byte tt_
typedef struct TValue {
TValuefields;
} TValue;
#define val_(o) ((o)->value_)
#define valraw(o) (&val_(o))
/* raw type tag of a TValue */
#define rawtt(o) ((o)->tt_)
/* tag with no variants (bits 0-3) */
#define novariant(t) ((t) & 0x0F)
/* type tag of a TValue (bits 0-3 for tags + variant bits 4-5) */
#define withvariant(t) ((t) & 0x3F)
#define ttypetag(o) withvariant(rawtt(o))
/* type of a TValue */
#define ttype(o) (novariant(rawtt(o)))
/* Macros to test type */
#define checktag(o,t) (rawtt(o) == (t))
#define checktype(o,t) (ttype(o) == (t))
/* Macros for internal tests */
/* collectable object has the same tag as the original value */
#define righttt(obj) (ttypetag(obj) == gcvalue(obj)->tt)
/*
** Any value being manipulated by the program either is non
** collectable, or the collectable object has the right tag
** and it is not dead.
*/
#define checkliveness(L,obj) \
((void)L, lua_longassert(!iscollectable(obj) || \
(righttt(obj) && (L == NULL || !isdead(G(L),gcvalue(obj))))))
/* Macros to set values */
/* set a value's tag */
#define settt_(o,t) ((o)->tt_=(t))
/* main macro to copy values (from 'obj1' to 'obj2') */
#define setobj(L,obj1,obj2) \
{ TValue *io1=(obj1); const TValue *io2=(obj2); \
io1->value_ = io2->value_; settt_(io1, io2->tt_); \
checkliveness(L,io1); lua_assert(!isnonstrictnil(io1)); }
/*
** Different types of assignments, according to source and destination.
** (They are mostly equal now, but may be different in the future.)
*/
/* from stack to stack */
#define setobjs2s(L,o1,o2) setobj(L,s2v(o1),s2v(o2))
/* to stack (not from same stack) */
#define setobj2s(L,o1,o2) setobj(L,s2v(o1),o2)
/* from table to same table */
#define setobjt2t setobj
/* to new object */
#define setobj2n setobj
/* to table */
#define setobj2t setobj
/*
** Entries in the Lua stack
*/
typedef union StackValue {
TValue val;
} StackValue;
/* index to stack elements */
typedef StackValue *StkId;
/* convert a 'StackValue' to a 'TValue' */
#define s2v(o) (&(o)->val)
/*
** {==================================================================
** Nil
** ===================================================================
*/
/* Standard nil */
#define LUA_VNIL makevariant(LUA_TNIL, 0)
/* Empty slot (which might be different from a slot containing nil) */
#define LUA_VEMPTY makevariant(LUA_TNIL, 1)
/* Value returned for a key not found in a table (absent key) */
#define LUA_VABSTKEY makevariant(LUA_TNIL, 2)
/* macro to test for (any kind of) nil */
#define ttisnil(v) checktype((v), LUA_TNIL)
/* macro to test for a standard nil */
#define ttisstrictnil(o) checktag((o), LUA_VNIL)
#define setnilvalue(obj) settt_(obj, LUA_VNIL)
#define isabstkey(v) checktag((v), LUA_VABSTKEY)
/*
** macro to detect non-standard nils (used only in assertions)
*/
#define isnonstrictnil(v) (ttisnil(v) && !ttisstrictnil(v))
/*
** By default, entries with any kind of nil are considered empty.
** (In any definition, values associated with absent keys must also
** be accepted as empty.)
*/
#define isempty(v) ttisnil(v)
/* macro defining a value corresponding to an absent key */
#define ABSTKEYCONSTANT {NULL}, LUA_VABSTKEY
/* mark an entry as empty */
#define setempty(v) settt_(v, LUA_VEMPTY)
/* }================================================================== */
/*
** {==================================================================
** Booleans
** ===================================================================
*/
#define LUA_VFALSE makevariant(LUA_TBOOLEAN, 0)
#define LUA_VTRUE makevariant(LUA_TBOOLEAN, 1)
#define ttisboolean(o) checktype((o), LUA_TBOOLEAN)
#define ttisfalse(o) checktag((o), LUA_VFALSE)
#define ttistrue(o) checktag((o), LUA_VTRUE)
#define l_isfalse(o) (ttisfalse(o) || ttisnil(o))
#define setbfvalue(obj) settt_(obj, LUA_VFALSE)
#define setbtvalue(obj) settt_(obj, LUA_VTRUE)
/* }================================================================== */
/*
** {==================================================================
** Threads
** ===================================================================
*/
#define LUA_VTHREAD makevariant(LUA_TTHREAD, 0)
#define ttisthread(o) checktag((o), ctb(LUA_VTHREAD))
#define thvalue(o) check_exp(ttisthread(o), gco2th(val_(o).gc))
#define setthvalue(L,obj,x) \
{ TValue *io = (obj); lua_State *x_ = (x); \
val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_VTHREAD)); \
checkliveness(L,io); }
#define setthvalue2s(L,o,t) setthvalue(L,s2v(o),t)
/* }================================================================== */
/*
** {==================================================================
** Collectable Objects
** ===================================================================
*/
/*
** Common Header for all collectable objects (in macro form, to be
** included in other objects)
*/
#define CommonHeader struct GCObject *next; lu_byte tt; lu_byte marked
/* Common type for all collectable objects */
typedef struct GCObject {
CommonHeader;
} GCObject;
/* Bit mark for collectable types */
#define BIT_ISCOLLECTABLE (1 << 6)
#define iscollectable(o) (rawtt(o) & BIT_ISCOLLECTABLE)
/* mark a tag as collectable */
#define ctb(t) ((t) | BIT_ISCOLLECTABLE)
#define gcvalue(o) check_exp(iscollectable(o), val_(o).gc)
#define gcvalueraw(v) ((v).gc)
#define setgcovalue(L,obj,x) \
{ TValue *io = (obj); GCObject *i_g=(x); \
val_(io).gc = i_g; settt_(io, ctb(i_g->tt)); }
/* }================================================================== */
/*
** {==================================================================
** Numbers
** ===================================================================
*/
/* Variant tags for numbers */
#define LUA_VNUMINT makevariant(LUA_TNUMBER, 0) /* integer numbers */
#define LUA_VNUMFLT makevariant(LUA_TNUMBER, 1) /* float numbers */
#define ttisnumber(o) checktype((o), LUA_TNUMBER)
#define ttisfloat(o) checktag((o), LUA_VNUMFLT)
#define ttisinteger(o) checktag((o), LUA_VNUMINT)
#define nvalue(o) check_exp(ttisnumber(o), \
(ttisinteger(o) ? cast_num(ivalue(o)) : fltvalue(o)))
#define fltvalue(o) check_exp(ttisfloat(o), val_(o).n)
#define ivalue(o) check_exp(ttisinteger(o), val_(o).i)
#define fltvalueraw(v) ((v).n)
#define ivalueraw(v) ((v).i)
#define setfltvalue(obj,x) \
{ TValue *io=(obj); val_(io).n=(x); settt_(io, LUA_VNUMFLT); }
#define chgfltvalue(obj,x) \
{ TValue *io=(obj); lua_assert(ttisfloat(io)); val_(io).n=(x); }
#define setivalue(obj,x) \
{ TValue *io=(obj); val_(io).i=(x); settt_(io, LUA_VNUMINT); }
#define chgivalue(obj,x) \
{ TValue *io=(obj); lua_assert(ttisinteger(io)); val_(io).i=(x); }
/* }================================================================== */
/*
** {==================================================================
** Strings
** ===================================================================
*/
/* Variant tags for strings */
#define LUA_VSHRSTR makevariant(LUA_TSTRING, 0) /* short strings */
#define LUA_VLNGSTR makevariant(LUA_TSTRING, 1) /* long strings */
#define ttisstring(o) checktype((o), LUA_TSTRING)
#define ttisshrstring(o) checktag((o), ctb(LUA_VSHRSTR))
#define ttislngstring(o) checktag((o), ctb(LUA_VLNGSTR))
#define tsvalueraw(v) (gco2ts((v).gc))
#define tsvalue(o) check_exp(ttisstring(o), gco2ts(val_(o).gc))
#define setsvalue(L,obj,x) \
{ TValue *io = (obj); TString *x_ = (x); \
val_(io).gc = obj2gco(x_); settt_(io, ctb(x_->tt)); \
checkliveness(L,io); }
/* set a string to the stack */
#define setsvalue2s(L,o,s) setsvalue(L,s2v(o),s)
/* set a string to a new object */
#define setsvalue2n setsvalue
/*
** Header for a string value.
*/
typedef struct TString {
CommonHeader;
lu_byte extra; /* reserved words for short strings; "has hash" for longs */
lu_byte shrlen; /* length for short strings */
unsigned int hash;
union {
size_t lnglen; /* length for long strings */
struct TString *hnext; /* linked list for hash table */
} u;
char contents[1];
} TString;
/*
** Get the actual string (array of bytes) from a 'TString'.
*/
#define getstr(ts) ((ts)->contents)
/* get the actual string (array of bytes) from a Lua value */
#define svalue(o) getstr(tsvalue(o))
/* get string length from 'TString *s' */
#define tsslen(s) ((s)->tt == LUA_VSHRSTR ? (s)->shrlen : (s)->u.lnglen)
/* get string length from 'TValue *o' */
#define vslen(o) tsslen(tsvalue(o))
/* }================================================================== */
/*
** {==================================================================
** Userdata
** ===================================================================
*/
/*
** Light userdata should be a variant of userdata, but for compatibility
** reasons they are also different types.
*/
#define LUA_VLIGHTUSERDATA makevariant(LUA_TLIGHTUSERDATA, 0)
#define LUA_VUSERDATA makevariant(LUA_TUSERDATA, 0)
#define ttislightuserdata(o) checktag((o), LUA_VLIGHTUSERDATA)
#define ttisfulluserdata(o) checktag((o), ctb(LUA_VUSERDATA))
#define pvalue(o) check_exp(ttislightuserdata(o), val_(o).p)
#define uvalue(o) check_exp(ttisfulluserdata(o), gco2u(val_(o).gc))
#define pvalueraw(v) ((v).p)
#define setpvalue(obj,x) \
{ TValue *io=(obj); val_(io).p=(x); settt_(io, LUA_VLIGHTUSERDATA); }
#define setuvalue(L,obj,x) \
{ TValue *io = (obj); Udata *x_ = (x); \
val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_VUSERDATA)); \
checkliveness(L,io); }
/* Ensures that addresses after this type are always fully aligned. */
typedef union UValue {
TValue uv;
LUAI_MAXALIGN; /* ensures maximum alignment for udata bytes */
} UValue;
/*
** Header for userdata with user values;
** memory area follows the end of this structure.
*/
typedef struct Udata {
CommonHeader;
unsigned short nuvalue; /* number of user values */
size_t len; /* number of bytes */
struct Table *metatable;
GCObject *gclist;
UValue uv[1]; /* user values */
} Udata;
/*
** Header for userdata with no user values. These userdata do not need
** to be gray during GC, and therefore do not need a 'gclist' field.
** To simplify, the code always use 'Udata' for both kinds of userdata,
** making sure it never accesses 'gclist' on userdata with no user values.
** This structure here is used only to compute the correct size for
** this representation. (The 'bindata' field in its end ensures correct
** alignment for binary data following this header.)
*/
typedef struct Udata0 {
CommonHeader;
unsigned short nuvalue; /* number of user values */
size_t len; /* number of bytes */
struct Table *metatable;
union {LUAI_MAXALIGN;} bindata;
} Udata0;
/* compute the offset of the memory area of a userdata */
#define udatamemoffset(nuv) \
((nuv) == 0 ? offsetof(Udata0, bindata) \
: offsetof(Udata, uv) + (sizeof(UValue) * (nuv)))
/* get the address of the memory block inside 'Udata' */
#define getudatamem(u) (cast_charp(u) + udatamemoffset((u)->nuvalue))
/* compute the size of a userdata */
#define sizeudata(nuv,nb) (udatamemoffset(nuv) + (nb))
/* }================================================================== */
/*
** {==================================================================
** Prototypes
** ===================================================================
*/
#define LUA_VPROTO makevariant(LUA_TPROTO, 0)
/*
** Description of an upvalue for function prototypes
*/
typedef struct Upvaldesc {
TString *name; /* upvalue name (for debug information) */
lu_byte instack; /* whether it is in stack (register) */
lu_byte idx; /* index of upvalue (in stack or in outer function's list) */
lu_byte kind; /* kind of corresponding variable */
} Upvaldesc;
/*
** Description of a local variable for function prototypes
** (used for debug information)
*/
typedef struct LocVar {
TString *varname;
int startpc; /* first point where variable is active */
int endpc; /* first point where variable is dead */
} LocVar;
/*
** Associates the absolute line source for a given instruction ('pc').
** The array 'lineinfo' gives, for each instruction, the difference in
** lines from the previous instruction. When that difference does not
** fit into a byte, Lua saves the absolute line for that instruction.
** (Lua also saves the absolute line periodically, to speed up the
** computation of a line number: we can use binary search in the
** absolute-line array, but we must traverse the 'lineinfo' array
** linearly to compute a line.)
*/
typedef struct AbsLineInfo {
int pc;
int line;
} AbsLineInfo;
/*
** Function Prototypes
*/
typedef struct Proto {
CommonHeader;
lu_byte numparams; /* number of fixed (named) parameters */
lu_byte is_vararg;
lu_byte maxstacksize; /* number of registers needed by this function */
int sizeupvalues; /* size of 'upvalues' */
int sizek; /* size of 'k' */
int sizecode;
int sizelineinfo;
int sizep; /* size of 'p' */
int sizelocvars;
int sizeabslineinfo; /* size of 'abslineinfo' */
int linedefined; /* debug information */
int lastlinedefined; /* debug information */
TValue *k; /* constants used by the function */
Instruction *code; /* opcodes */
struct Proto **p; /* functions defined inside the function */
Upvaldesc *upvalues; /* upvalue information */
ls_byte *lineinfo; /* information about source lines (debug information) */
AbsLineInfo *abslineinfo; /* idem */
LocVar *locvars; /* information about local variables (debug information) */
TString *source; /* used for debug information */
GCObject *gclist;
} Proto;
/* }================================================================== */
/*
** {==================================================================
** Closures
** ===================================================================
*/
#define LUA_VUPVAL makevariant(LUA_TUPVAL, 0)
/* Variant tags for functions */
#define LUA_VLCL makevariant(LUA_TFUNCTION, 0) /* Lua closure */
#define LUA_VLCF makevariant(LUA_TFUNCTION, 1) /* light C function */
#define LUA_VCCL makevariant(LUA_TFUNCTION, 2) /* C closure */
#define ttisfunction(o) checktype(o, LUA_TFUNCTION)
#define ttisclosure(o) ((rawtt(o) & 0x1F) == LUA_VLCL)
#define ttisLclosure(o) checktag((o), ctb(LUA_VLCL))
#define ttislcf(o) checktag((o), LUA_VLCF)
#define ttisCclosure(o) checktag((o), ctb(LUA_VCCL))
#define isLfunction(o) ttisLclosure(o)
#define clvalue(o) check_exp(ttisclosure(o), gco2cl(val_(o).gc))
#define clLvalue(o) check_exp(ttisLclosure(o), gco2lcl(val_(o).gc))
#define fvalue(o) check_exp(ttislcf(o), val_(o).f)
#define clCvalue(o) check_exp(ttisCclosure(o), gco2ccl(val_(o).gc))
#define fvalueraw(v) ((v).f)
#define setclLvalue(L,obj,x) \
{ TValue *io = (obj); LClosure *x_ = (x); \
val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_VLCL)); \
checkliveness(L,io); }
#define setclLvalue2s(L,o,cl) setclLvalue(L,s2v(o),cl)
#define setfvalue(obj,x) \
{ TValue *io=(obj); val_(io).f=(x); settt_(io, LUA_VLCF); }
#define setclCvalue(L,obj,x) \
{ TValue *io = (obj); CClosure *x_ = (x); \
val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_VCCL)); \
checkliveness(L,io); }
/*
** Upvalues for Lua closures
*/
typedef struct UpVal {
CommonHeader;
lu_byte tbc; /* true if it represents a to-be-closed variable */
TValue *v; /* points to stack or to its own value */
union {
struct { /* (when open) */
struct UpVal *next; /* linked list */
struct UpVal **previous;
} open;
TValue value; /* the value (when closed) */
} u;
} UpVal;
#define ClosureHeader \
CommonHeader; lu_byte nupvalues; GCObject *gclist
typedef struct CClosure {
ClosureHeader;
lua_CFunction f;
TValue upvalue[1]; /* list of upvalues */
} CClosure;
typedef struct LClosure {
ClosureHeader;
struct Proto *p;
UpVal *upvals[1]; /* list of upvalues */
} LClosure;
typedef union Closure {
CClosure c;
LClosure l;
} Closure;
#define getproto(o) (clLvalue(o)->p)
/* }================================================================== */
/*
** {==================================================================
** Tables
** ===================================================================
*/
#define LUA_VTABLE makevariant(LUA_TTABLE, 0)
#define ttistable(o) checktag((o), ctb(LUA_VTABLE))
#define hvalue(o) check_exp(ttistable(o), gco2t(val_(o).gc))
#define sethvalue(L,obj,x) \
{ TValue *io = (obj); Table *x_ = (x); \
val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_VTABLE)); \
checkliveness(L,io); }
#define sethvalue2s(L,o,h) sethvalue(L,s2v(o),h)
/*
** Nodes for Hash tables: A pack of two TValue's (key-value pairs)
** plus a 'next' field to link colliding entries. The distribution
** of the key's fields ('key_tt' and 'key_val') not forming a proper
** 'TValue' allows for a smaller size for 'Node' both in 4-byte
** and 8-byte alignments.
*/
typedef union Node {
struct NodeKey {
TValuefields; /* fields for value */
lu_byte key_tt; /* key type */
int next; /* for chaining */
Value key_val; /* key value */
} u;
TValue i_val; /* direct access to node's value as a proper 'TValue' */
} Node;
/* copy a value into a key */
#define setnodekey(L,node,obj) \
{ Node *n_=(node); const TValue *io_=(obj); \
n_->u.key_val = io_->value_; n_->u.key_tt = io_->tt_; \
checkliveness(L,io_); }
/* copy a value from a key */
#define getnodekey(L,obj,node) \
{ TValue *io_=(obj); const Node *n_=(node); \
io_->value_ = n_->u.key_val; io_->tt_ = n_->u.key_tt; \
checkliveness(L,io_); }
/*
** About 'alimit': if 'isrealasize(t)' is true, then 'alimit' is the
** real size of 'array'. Otherwise, the real size of 'array' is the
** smallest power of two not smaller than 'alimit' (or zero iff 'alimit'
** is zero); 'alimit' is then used as a hint for #t.
*/
#define BITRAS (1 << 7)
#define isrealasize(t) (!((t)->marked & BITRAS))
#define setrealasize(t) ((t)->marked &= cast_byte(~BITRAS))
#define setnorealasize(t) ((t)->marked |= BITRAS)
typedef struct Table {
CommonHeader;
lu_byte flags; /* 1<<p means tagmethod(p) is not present */
lu_byte lsizenode; /* log2 of size of 'node' array */
unsigned int alimit; /* "limit" of 'array' array */
TValue *array; /* array part */
Node *node;
Node *lastfree; /* any free position is before this position */
struct Table *metatable;
GCObject *gclist;
} Table;
/*
** Macros to manipulate keys inserted in nodes
*/
#define keytt(node) ((node)->u.key_tt)
#define keyval(node) ((node)->u.key_val)
#define keyisnil(node) (keytt(node) == LUA_TNIL)
#define keyisinteger(node) (keytt(node) == LUA_VNUMINT)
#define keyival(node) (keyval(node).i)
#define keyisshrstr(node) (keytt(node) == ctb(LUA_VSHRSTR))
#define keystrval(node) (gco2ts(keyval(node).gc))
#define setnilkey(node) (keytt(node) = LUA_TNIL)
#define keyiscollectable(n) (keytt(n) & BIT_ISCOLLECTABLE)
#define gckey(n) (keyval(n).gc)
#define gckeyN(n) (keyiscollectable(n) ? gckey(n) : NULL)
/*
** Use a "nil table" to mark dead keys in a table. Those keys serve
** to keep space for removed entries, which may still be part of
** chains. Note that the 'keytt' does not have the BIT_ISCOLLECTABLE
** set, so these values are considered not collectable and are different
** from any valid value.
*/
#define setdeadkey(n) (keytt(n) = LUA_TTABLE, gckey(n) = NULL)
/* }================================================================== */
/*
** 'module' operation for hashing (size is always a power of 2)
*/
#define lmod(s,size) \
(check_exp((size&(size-1))==0, (cast_int((s) & ((size)-1)))))
#define twoto(x) (1<<(x))
#define sizenode(t) (twoto((t)->lsizenode))
/* size of buffer for 'luaO_utf8esc' function */
#define UTF8BUFFSZ 8
LUAI_FUNC int luaO_utf8esc (char *buff, unsigned long x);
LUAI_FUNC int luaO_ceillog2 (unsigned int x);
LUAI_FUNC int luaO_rawarith (lua_State *L, int op, const TValue *p1,
const TValue *p2, TValue *res);
LUAI_FUNC void luaO_arith (lua_State *L, int op, const TValue *p1,
const TValue *p2, StkId res);
LUAI_FUNC size_t luaO_str2num (const char *s, TValue *o);
LUAI_FUNC int luaO_hexavalue (int c);
LUAI_FUNC void luaO_tostring (lua_State *L, TValue *obj);
LUAI_FUNC const char *luaO_pushvfstring (lua_State *L, const char *fmt,
va_list argp);
LUAI_FUNC const char *luaO_pushfstring (lua_State *L, const char *fmt, ...);
LUAI_FUNC void luaO_chunkid (char *out, const char *source, size_t srclen);
#endif
/*
** $Id: lobject.c $
** Some generic functions over Lua objects
** See Copyright Notice in lua.h
*/
#define lobject_c
#define LUA_CORE
#include "lprefix.h"
#include <locale.h>
#include <math.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lua.h"
#include "lctype.h"
#include "ldebug.h"
#include "ldo.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
#include "lstring.h"
#include "lvm.h"
/*
** Computes ceil(log2(x))
*/
int luaO_ceillog2 (unsigned int x) {
static const lu_byte log_2[256] = { /* log_2[i] = ceil(log2(i - 1)) */
0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8
};
int l = 0;
x--;
while (x >= 256) { l += 8; x >>= 8; }
return l + log_2[x];
}
static lua_Integer intarith (lua_State *L, int op, lua_Integer v1,
lua_Integer v2) {
switch (op) {
case LUA_OPADD: return intop(+, v1, v2);
case LUA_OPSUB:return intop(-, v1, v2);
case LUA_OPMUL:return intop(*, v1, v2);
case LUA_OPMOD: return luaV_mod(L, v1, v2);
case LUA_OPIDIV: return luaV_idiv(L, v1, v2);
case LUA_OPBAND: return intop(&, v1, v2);
case LUA_OPBOR: return intop(|, v1, v2);
case LUA_OPBXOR: return intop(^, v1, v2);
case LUA_OPSHL: return luaV_shiftl(v1, v2);
case LUA_OPSHR: return luaV_shiftl(v1, -v2);
case LUA_OPUNM: return intop(-, 0, v1);
case LUA_OPBNOT: return intop(^, ~l_castS2U(0), v1);
default: lua_assert(0); return 0;
}
}
static lua_Number numarith (lua_State *L, int op, lua_Number v1,
lua_Number v2) {
switch (op) {
case LUA_OPADD: return luai_numadd(L, v1, v2);
case LUA_OPSUB: return luai_numsub(L, v1, v2);
case LUA_OPMUL: return luai_nummul(L, v1, v2);
case LUA_OPDIV: return luai_numdiv(L, v1, v2);
case LUA_OPPOW: return luai_numpow(L, v1, v2);
case LUA_OPIDIV: return luai_numidiv(L, v1, v2);
case LUA_OPUNM: return luai_numunm(L, v1);
case LUA_OPMOD: return luaV_modf(L, v1, v2);
default: lua_assert(0); return 0;
}
}
int luaO_rawarith (lua_State *L, int op, const TValue *p1, const TValue *p2,
TValue *res) {
switch (op) {
case LUA_OPBAND: case LUA_OPBOR: case LUA_OPBXOR:
case LUA_OPSHL: case LUA_OPSHR:
case LUA_OPBNOT: { /* operate only on integers */
lua_Integer i1; lua_Integer i2;
if (tointegerns(p1, &i1) && tointegerns(p2, &i2)) {
setivalue(res, intarith(L, op, i1, i2));
return 1;
}
else return 0; /* fail */
}
case LUA_OPDIV: case LUA_OPPOW: { /* operate only on floats */
lua_Number n1; lua_Number n2;
if (tonumberns(p1, n1) && tonumberns(p2, n2)) {
setfltvalue(res, numarith(L, op, n1, n2));
return 1;
}
else return 0; /* fail */
}
default: { /* other operations */
lua_Number n1; lua_Number n2;
if (ttisinteger(p1) && ttisinteger(p2)) {
setivalue(res, intarith(L, op, ivalue(p1), ivalue(p2)));
return 1;
}
else if (tonumberns(p1, n1) && tonumberns(p2, n2)) {
setfltvalue(res, numarith(L, op, n1, n2));
return 1;
}
else return 0; /* fail */
}
}
}
void luaO_arith (lua_State *L, int op, const TValue *p1, const TValue *p2,
StkId res) {
if (!luaO_rawarith(L, op, p1, p2, s2v(res))) {
/* could not perform raw operation; try metamethod */
luaT_trybinTM(L, p1, p2, res, cast(TMS, (op - LUA_OPADD) + TM_ADD));
}
}
int luaO_hexavalue (int c) {
if (lisdigit(c)) return c - '0';
else return (ltolower(c) - 'a') + 10;
}
static int isneg (const char **s) {
if (**s == '-') { (*s)++; return 1; }
else if (**s == '+') (*s)++;
return 0;
}
/*
** {==================================================================
** Lua's implementation for 'lua_strx2number'
** ===================================================================
*/
#if !defined(lua_strx2number)
/* maximum number of significant digits to read (to avoid overflows
even with single floats) */
#define MAXSIGDIG 30
/*
** convert a hexadecimal numeric string to a number, following
** C99 specification for 'strtod'
*/
static lua_Number lua_strx2number (const char *s, char **endptr) {
int dot = lua_getlocaledecpoint();
lua_Number r = 0.0; /* result (accumulator) */
int sigdig = 0; /* number of significant digits */
int nosigdig = 0; /* number of non-significant digits */
int e = 0; /* exponent correction */
int neg; /* 1 if number is negative */
int hasdot = 0; /* true after seen a dot */
*endptr = cast_charp(s); /* nothing is valid yet */
while (lisspace(cast_uchar(*s))) s++; /* skip initial spaces */
neg = isneg(&s); /* check sign */
if (!(*s == '0' && (*(s + 1) == 'x' || *(s + 1) == 'X'))) /* check '0x' */
return 0.0; /* invalid format (no '0x') */
for (s += 2; ; s++) { /* skip '0x' and read numeral */
if (*s == dot) {
if (hasdot) break; /* second dot? stop loop */
else hasdot = 1;
}
else if (lisxdigit(cast_uchar(*s))) {
if (sigdig == 0 && *s == '0') /* non-significant digit (zero)? */
nosigdig++;
else if (++sigdig <= MAXSIGDIG) /* can read it without overflow? */
r = (r * cast_num(16.0)) + luaO_hexavalue(*s);
else e++; /* too many digits; ignore, but still count for exponent */
if (hasdot) e--; /* decimal digit? correct exponent */
}
else break; /* neither a dot nor a digit */
}
if (nosigdig + sigdig == 0) /* no digits? */
return 0.0; /* invalid format */
*endptr = cast_charp(s); /* valid up to here */
e *= 4; /* each digit multiplies/divides value by 2^4 */
if (*s == 'p' || *s == 'P') { /* exponent part? */
int exp1 = 0; /* exponent value */
int neg1; /* exponent sign */
s++; /* skip 'p' */
neg1 = isneg(&s); /* sign */
if (!lisdigit(cast_uchar(*s)))
return 0.0; /* invalid; must have at least one digit */
while (lisdigit(cast_uchar(*s))) /* read exponent */
exp1 = exp1 * 10 + *(s++) - '0';
if (neg1) exp1 = -exp1;
e += exp1;
*endptr = cast_charp(s); /* valid up to here */
}
if (neg) r = -r;
return l_mathop(ldexp)(r, e);
}
#endif
/* }====================================================== */
/* maximum length of a numeral */
#if !defined (L_MAXLENNUM)
#define L_MAXLENNUM 200
#endif
static const char *l_str2dloc (const char *s, lua_Number *result, int mode) {
char *endptr;
*result = (mode == 'x') ? lua_strx2number(s, &endptr) /* try to convert */
: lua_str2number(s, &endptr);
if (endptr == s) return NULL; /* nothing recognized? */
while (lisspace(cast_uchar(*endptr))) endptr++; /* skip trailing spaces */
return (*endptr == '\0') ? endptr : NULL; /* OK if no trailing characters */
}
/*
** Convert string 's' to a Lua number (put in 'result'). Return NULL
** on fail or the address of the ending '\0' on success.
** 'pmode' points to (and 'mode' contains) special things in the string:
** - 'x'/'X' means a hexadecimal numeral
** - 'n'/'N' means 'inf' or 'nan' (which should be rejected)
** - '.' just optimizes the search for the common case (nothing special)
** This function accepts both the current locale or a dot as the radix
** mark. If the conversion fails, it may mean number has a dot but
** locale accepts something else. In that case, the code copies 's'
** to a buffer (because 's' is read-only), changes the dot to the
** current locale radix mark, and tries to convert again.
*/
static const char *l_str2d (const char *s, lua_Number *result) {
const char *endptr;
const char *pmode = strpbrk(s, ".xXnN");
int mode = pmode ? ltolower(cast_uchar(*pmode)) : 0;
if (mode == 'n') /* reject 'inf' and 'nan' */
return NULL;
endptr = l_str2dloc(s, result, mode); /* try to convert */
if (endptr == NULL) { /* failed? may be a different locale */
char buff[L_MAXLENNUM + 1];
const char *pdot = strchr(s, '.');
if (strlen(s) > L_MAXLENNUM || pdot == NULL)
return NULL; /* string too long or no dot; fail */
strcpy(buff, s); /* copy string to buffer */
buff[pdot - s] = lua_getlocaledecpoint(); /* correct decimal point */
endptr = l_str2dloc(buff, result, mode); /* try again */
if (endptr != NULL)
endptr = s + (endptr - buff); /* make relative to 's' */
}
return endptr;
}
#define MAXBY10 cast(lua_Unsigned, LUA_MAXINTEGER / 10)
#define MAXLASTD cast_int(LUA_MAXINTEGER % 10)
static const char *l_str2int (const char *s, lua_Integer *result) {
lua_Unsigned a = 0;
int empty = 1;
int neg;
while (lisspace(cast_uchar(*s))) s++; /* skip initial spaces */
neg = isneg(&s);
if (s[0] == '0' &&
(s[1] == 'x' || s[1] == 'X')) { /* hex? */
s += 2; /* skip '0x' */
for (; lisxdigit(cast_uchar(*s)); s++) {
a = a * 16 + luaO_hexavalue(*s);
empty = 0;
}
}
else { /* decimal */
for (; lisdigit(cast_uchar(*s)); s++) {
int d = *s - '0';
if (a >= MAXBY10 && (a > MAXBY10 || d > MAXLASTD + neg)) /* overflow? */
return NULL; /* do not accept it (as integer) */
a = a * 10 + d;
empty = 0;
}
}
while (lisspace(cast_uchar(*s))) s++; /* skip trailing spaces */
if (empty || *s != '\0') return NULL; /* something wrong in the numeral */
else {
*result = l_castU2S((neg) ? 0u - a : a);
return s;
}
}
size_t luaO_str2num (const char *s, TValue *o) {
lua_Integer i; lua_Number n;
const char *e;
if ((e = l_str2int(s, &i)) != NULL) { /* try as an integer */
setivalue(o, i);
}
else if ((e = l_str2d(s, &n)) != NULL) { /* else try as a float */
setfltvalue(o, n);
}
else
return 0; /* conversion failed */
return (e - s) + 1; /* success; return string size */
}
int luaO_utf8esc (char *buff, unsigned long x) {
int n = 1; /* number of bytes put in buffer (backwards) */
lua_assert(x <= 0x7FFFFFFFu);
if (x < 0x80) /* ascii? */
buff[UTF8BUFFSZ - 1] = cast_char(x);
else { /* need continuation bytes */
unsigned int mfb = 0x3f; /* maximum that fits in first byte */
do { /* add continuation bytes */
buff[UTF8BUFFSZ - (n++)] = cast_char(0x80 | (x & 0x3f));
x >>= 6; /* remove added bits */
mfb >>= 1; /* now there is one less bit available in first byte */
} while (x > mfb); /* still needs continuation byte? */
buff[UTF8BUFFSZ - n] = cast_char((~mfb << 1) | x); /* add first byte */
}
return n;
}
/* maximum length of the conversion of a number to a string */
#define MAXNUMBER2STR 50
/*
** Convert a number object to a string, adding it to a buffer
*/
static int tostringbuff (TValue *obj, char *buff) {
int len;
lua_assert(ttisnumber(obj));
if (ttisinteger(obj))
len = lua_integer2str(buff, MAXNUMBER2STR, ivalue(obj));
else {
len = lua_number2str(buff, MAXNUMBER2STR, fltvalue(obj));
if (buff[strspn(buff, "-0123456789")] == '\0') { /* looks like an int? */
buff[len++] = lua_getlocaledecpoint();
buff[len++] = '0'; /* adds '.0' to result */
}
}
return len;
}
/*
** Convert a number object to a Lua string, replacing the value at 'obj'
*/
void luaO_tostring (lua_State *L, TValue *obj) {
char buff[MAXNUMBER2STR];
int len = tostringbuff(obj, buff);
setsvalue(L, obj, luaS_newlstr(L, buff, len));
}
/*
** {==================================================================
** 'luaO_pushvfstring'
** ===================================================================
*/
/* size for buffer space used by 'luaO_pushvfstring' */
#define BUFVFS 400
/* buffer used by 'luaO_pushvfstring' */
typedef struct BuffFS {
lua_State *L;
int pushed; /* number of string pieces already on the stack */
int blen; /* length of partial string in 'space' */
char space[BUFVFS]; /* holds last part of the result */
} BuffFS;
/*
** Push given string to the stack, as part of the buffer. If the stack
** is almost full, join all partial strings in the stack into one.
*/
static void pushstr (BuffFS *buff, const char *str, size_t l) {
lua_State *L = buff->L;
setsvalue2s(L, L->top, luaS_newlstr(L, str, l));
L->top++; /* may use one extra slot */
buff->pushed++;
if (buff->pushed > 1 && L->top + 1 >= L->stack_last) {
luaV_concat(L, buff->pushed); /* join all partial results into one */
buff->pushed = 1;
}
}
/*
** empty the buffer space into the stack
*/
static void clearbuff (BuffFS *buff) {
pushstr(buff, buff->space, buff->blen); /* push buffer contents */
buff->blen = 0; /* space now is empty */
}
/*
** Get a space of size 'sz' in the buffer. If buffer has not enough
** space, empty it. 'sz' must fit in an empty buffer.
*/
static char *getbuff (BuffFS *buff, int sz) {
lua_assert(buff->blen <= BUFVFS); lua_assert(sz <= BUFVFS);
if (sz > BUFVFS - buff->blen) /* not enough space? */
clearbuff(buff);
return buff->space + buff->blen;
}
#define addsize(b,sz) ((b)->blen += (sz))
/*
** Add 'str' to the buffer. If string is larger than the buffer space,
** push the string directly to the stack.
*/
static void addstr2buff (BuffFS *buff, const char *str, size_t slen) {
if (slen <= BUFVFS) { /* does string fit into buffer? */
char *bf = getbuff(buff, cast_int(slen));
memcpy(bf, str, slen); /* add string to buffer */
addsize(buff, cast_int(slen));
}
else { /* string larger than buffer */
clearbuff(buff); /* string comes after buffer's content */
pushstr(buff, str, slen); /* push string */
}
}
/*
** Add a number to the buffer.
*/
static void addnum2buff (BuffFS *buff, TValue *num) {
char *numbuff = getbuff(buff, MAXNUMBER2STR);
int len = tostringbuff(num, numbuff); /* format number into 'numbuff' */
addsize(buff, len);
}
/*
** this function handles only '%d', '%c', '%f', '%p', '%s', and '%%'
conventional formats, plus Lua-specific '%I' and '%U'
*/
const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) {
BuffFS buff; /* holds last part of the result */
const char *e; /* points to next '%' */
buff.pushed = buff.blen = 0;
buff.L = L;
while ((e = strchr(fmt, '%')) != NULL) {
addstr2buff(&buff, fmt, e - fmt); /* add 'fmt' up to '%' */
switch (*(e + 1)) { /* conversion specifier */
case 's': { /* zero-terminated string */
const char *s = va_arg(argp, char *);
if (s == NULL) s = "(null)";
addstr2buff(&buff, s, strlen(s));
break;
}
case 'c': { /* an 'int' as a character */
char c = cast_uchar(va_arg(argp, int));
addstr2buff(&buff, &c, sizeof(char));
break;
}
case 'd': { /* an 'int' */
TValue num;
setivalue(&num, va_arg(argp, int));
addnum2buff(&buff, &num);
break;
}
case 'I': { /* a 'lua_Integer' */
TValue num;
setivalue(&num, cast(lua_Integer, va_arg(argp, l_uacInt)));
addnum2buff(&buff, &num);
break;
}
case 'f': { /* a 'lua_Number' */
TValue num;
setfltvalue(&num, cast_num(va_arg(argp, l_uacNumber)));
addnum2buff(&buff, &num);
break;
}
case 'p': { /* a pointer */
const int sz = 3 * sizeof(void*) + 8; /* enough space for '%p' */
char *bf = getbuff(&buff, sz);
void *p = va_arg(argp, void *);
int len = lua_pointer2str(bf, sz, p);
addsize(&buff, len);
break;
}
case 'U': { /* a 'long' as a UTF-8 sequence */
char bf[UTF8BUFFSZ];
int len = luaO_utf8esc(bf, va_arg(argp, long));
addstr2buff(&buff, bf + UTF8BUFFSZ - len, len);
break;
}
case '%': {
addstr2buff(&buff, "%", 1);
break;
}
default: {
luaG_runerror(L, "invalid option '%%%c' to 'lua_pushfstring'",
*(e + 1));
}
}
fmt = e + 2; /* skip '%' and the specifier */
}
addstr2buff(&buff, fmt, strlen(fmt)); /* rest of 'fmt' */
clearbuff(&buff); /* empty buffer into the stack */
if (buff.pushed > 1)
luaV_concat(L, buff.pushed); /* join all partial results */
return svalue(s2v(L->top - 1));
}
const char *luaO_pushfstring (lua_State *L, const char *fmt, ...) {
const char *msg;
va_list argp;
va_start(argp, fmt);
msg = luaO_pushvfstring(L, fmt, argp);
va_end(argp);
return msg;
}
/* }================================================================== */
#define RETS "..."
#define PRE "[string \""
#define POS "\"]"
#define addstr(a,b,l) ( memcpy(a,b,(l) * sizeof(char)), a += (l) )
void luaO_chunkid (char *out, const char *source, size_t srclen) {
size_t bufflen = LUA_IDSIZE; /* free space in buffer */
if (*source == '=') { /* 'literal' source */
if (srclen <= bufflen) /* small enough? */
memcpy(out, source + 1, srclen * sizeof(char));
else { /* truncate it */
addstr(out, source + 1, bufflen - 1);
*out = '\0';
}
}
else if (*source == '@') { /* file name */
if (srclen <= bufflen) /* small enough? */
memcpy(out, source + 1, srclen * sizeof(char));
else { /* add '...' before rest of name */
addstr(out, RETS, LL(RETS));
bufflen -= LL(RETS);
memcpy(out, source + 1 + srclen - bufflen, bufflen * sizeof(char));
}
}
else { /* string; format as [string "source"] */
const char *nl = strchr(source, '\n'); /* find first new line (if any) */
addstr(out, PRE, LL(PRE)); /* add prefix */
bufflen -= LL(PRE RETS POS) + 1; /* save space for prefix+suffix+'\0' */
if (srclen < bufflen && nl == NULL) { /* small one-line source? */
addstr(out, source, srclen); /* keep it */
}
else {
if (nl != NULL) srclen = nl - source; /* stop at first newline */
if (srclen > bufflen) srclen = bufflen;
addstr(out, source, srclen);
addstr(out, RETS, LL(RETS));
}
memcpy(out, POS, (LL(POS) + 1) * sizeof(char));
}
}
LOPCODES¶
/*
** $Id: lopcodes.h $
** Opcodes for Lua virtual machine
** See Copyright Notice in lua.h
*/
#ifndef lopcodes_h
#define lopcodes_h
#include "llimits.h"
#include "_native_lua_config.h" /* native Lua */
/*===========================================================================
We assume that instructions are unsigned 32-bit integers.
All instructions have an opcode in the first 7 bits.
Instructions can have the following formats:
3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
iABC C(8) | B(8) |k| A(8) | Op(7) |
iABx Bx(17) | A(8) | Op(7) |
iAsBx sBx (signed)(17) | A(8) | Op(7) |
iAx Ax(25) | Op(7) |
isJ sJ(25) | Op(7) |
A signed argument is represented in excess K: the represented value is
the written unsigned value minus K, where K is half the maximum for the
corresponding unsigned argument.
===========================================================================*/
enum OpMode {iABC, iABx, iAsBx, iAx, isJ}; /* basic instruction formats */
/*
** size and position of opcode arguments.
*/
#define SIZE_C 8
#define SIZE_B 8
#define SIZE_Bx (SIZE_C + SIZE_B + 1)
#define SIZE_A 8
#define SIZE_Ax (SIZE_Bx + SIZE_A)
#define SIZE_sJ (SIZE_Bx + SIZE_A)
#define SIZE_OP 7
#define POS_OP 0
#define POS_A (POS_OP + SIZE_OP)
#define POS_k (POS_A + SIZE_A)
#define POS_B (POS_k + 1)
#define POS_C (POS_B + SIZE_B)
#define POS_Bx POS_k
#define POS_Ax POS_A
#define POS_sJ POS_A
/*
** limits for opcode arguments.
** we use (signed) 'int' to manipulate most arguments,
** so they must fit in ints.
*/
/* Check whether type 'int' has at least 'b' bits ('b' < 32) */
#define L_INTHASBITS(b) ((UINT_MAX >> ((b) - 1)) >= 1)
#if L_INTHASBITS(SIZE_Bx)
#define MAXARG_Bx ((1<<SIZE_Bx)-1)
#else
#define MAXARG_Bx MAX_INT
#endif
#define OFFSET_sBx (MAXARG_Bx>>1) /* 'sBx' is signed */
#if L_INTHASBITS(SIZE_Ax)
#define MAXARG_Ax ((1<<SIZE_Ax)-1)
#else
#define MAXARG_Ax MAX_INT
#endif
#if L_INTHASBITS(SIZE_sJ)
#define MAXARG_sJ ((1 << SIZE_sJ) - 1)
#else
#define MAXARG_sJ MAX_INT
#endif
#define OFFSET_sJ (MAXARG_sJ >> 1)
#define MAXARG_A ((1<<SIZE_A)-1)
#define MAXARG_B ((1<<SIZE_B)-1)
#define MAXARG_C ((1<<SIZE_C)-1)
#define OFFSET_sC (MAXARG_C >> 1)
#define int2sC(i) ((i) + OFFSET_sC)
#define sC2int(i) ((i) - OFFSET_sC)
/* creates a mask with 'n' 1 bits at position 'p' */
#define MASK1(n,p) ((~((~(Instruction)0)<<(n)))<<(p))
/* creates a mask with 'n' 0 bits at position 'p' */
#define MASK0(n,p) (~MASK1(n,p))
/*
** the following macros help to manipulate instructions
*/
#define GET_OPCODE(i) (cast(OpCode, ((i)>>POS_OP) & MASK1(SIZE_OP,0)))
#define SET_OPCODE(i,o) ((i) = (((i)&MASK0(SIZE_OP,POS_OP)) | \
((cast(Instruction, o)<<POS_OP)&MASK1(SIZE_OP,POS_OP))))
#define checkopm(i,m) (getOpMode(GET_OPCODE(i)) == m)
#define getarg(i,pos,size) (cast_int(((i)>>(pos)) & MASK1(size,0)))
#define setarg(i,v,pos,size) ((i) = (((i)&MASK0(size,pos)) | \
((cast(Instruction, v)<<pos)&MASK1(size,pos))))
#define GETARG_A(i) getarg(i, POS_A, SIZE_A)
#define SETARG_A(i,v) setarg(i, v, POS_A, SIZE_A)
#define GETARG_B(i) check_exp(checkopm(i, iABC), getarg(i, POS_B, SIZE_B))
#define GETARG_sB(i) sC2int(GETARG_B(i))
#define SETARG_B(i,v) setarg(i, v, POS_B, SIZE_B)
#define GETARG_C(i) check_exp(checkopm(i, iABC), getarg(i, POS_C, SIZE_C))
#define GETARG_sC(i) sC2int(GETARG_C(i))
#define SETARG_C(i,v) setarg(i, v, POS_C, SIZE_C)
#define TESTARG_k(i) check_exp(checkopm(i, iABC), (cast_int(((i) & (1u << POS_k)))))
#define GETARG_k(i) check_exp(checkopm(i, iABC), getarg(i, POS_k, 1))
#define SETARG_k(i,v) setarg(i, v, POS_k, 1)
#define GETARG_Bx(i) check_exp(checkopm(i, iABx), getarg(i, POS_Bx, SIZE_Bx))
#define SETARG_Bx(i,v) setarg(i, v, POS_Bx, SIZE_Bx)
#define GETARG_Ax(i) check_exp(checkopm(i, iAx), getarg(i, POS_Ax, SIZE_Ax))
#define SETARG_Ax(i,v) setarg(i, v, POS_Ax, SIZE_Ax)
#define GETARG_sBx(i) \
check_exp(checkopm(i, iAsBx), getarg(i, POS_Bx, SIZE_Bx) - OFFSET_sBx)
#define SETARG_sBx(i,b) SETARG_Bx((i),cast_uint((b)+OFFSET_sBx))
#define GETARG_sJ(i) \
check_exp(checkopm(i, isJ), getarg(i, POS_sJ, SIZE_sJ) - OFFSET_sJ)
#define SETARG_sJ(i,j) \
setarg(i, cast_uint((j)+OFFSET_sJ), POS_sJ, SIZE_sJ)
#define CREATE_ABCk(o,a,b,c,k) ((cast(Instruction, o)<<POS_OP) \
| (cast(Instruction, a)<<POS_A) \
| (cast(Instruction, b)<<POS_B) \
| (cast(Instruction, c)<<POS_C) \
| (cast(Instruction, k)<<POS_k))
#define CREATE_ABx(o,a,bc) ((cast(Instruction, o)<<POS_OP) \
| (cast(Instruction, a)<<POS_A) \
| (cast(Instruction, bc)<<POS_Bx))
#define CREATE_Ax(o,a) ((cast(Instruction, o)<<POS_OP) \
| (cast(Instruction, a)<<POS_Ax))
#define CREATE_sJ(o,j,k) ((cast(Instruction, o) << POS_OP) \
| (cast(Instruction, j) << POS_sJ) \
| (cast(Instruction, k) << POS_k))
#if !defined(MAXINDEXRK) /* (for debugging only) */
#define MAXINDEXRK MAXARG_B
#endif
/*
** invalid register that fits in 8 bits
*/
#define NO_REG MAXARG_A
/*
** R[x] - register
** K[x] - constant (in constant table)
** RK(x) == if k(i) then K[x] else R[x]
*/
/*
** grep "ORDER OP" if you change these enums
*/
typedef enum {
/*----------------------------------------------------------------------
name args description
------------------------------------------------------------------------*/
OP_MOVE,/* A B R[A] := R[B] */
OP_LOADI,/* A sBx R[A] := sBx */
OP_LOADF,/* A sBx R[A] := (lua_Number)sBx */
OP_LOADK,/* A Bx R[A] := K[Bx] */
OP_LOADKX,/* A R[A] := K[extra arg] */
OP_LOADFALSE,/* A R[A] := false */
OP_LFALSESKIP,/*A R[A] := false; pc++ */
OP_LOADTRUE,/* A R[A] := true */
OP_LOADNIL,/* A B R[A], R[A+1], ..., R[A+B] := nil */
OP_GETUPVAL,/* A B R[A] := UpValue[B] */
OP_SETUPVAL,/* A B UpValue[B] := R[A] */
OP_GETTABUP,/* A B C R[A] := UpValue[B][K[C]:string] */
OP_GETTABLE,/* A B C R[A] := R[B][R[C]] */
OP_GETI,/* A B C R[A] := R[B][C] */
OP_GETFIELD,/* A B C R[A] := R[B][K[C]:string] */
OP_SETTABUP,/* A B C UpValue[A][K[B]:string] := RK(C) */
OP_SETTABLE,/* A B C R[A][R[B]] := RK(C) */
OP_SETI,/* A B C R[A][B] := RK(C) */
OP_SETFIELD,/* A B C R[A][K[B]:string] := RK(C) */
OP_NEWTABLE,/* A B C k R[A] := {} */
OP_SELF,/* A B C R[A+1] := R[B]; R[A] := R[B][RK(C):string] */
OP_ADDI,/* A B sC R[A] := R[B] + sC */
OP_ADDK,/* A B C R[A] := R[B] + K[C] */
OP_SUBK,/* A B C R[A] := R[B] - K[C] */
OP_MULK,/* A B C R[A] := R[B] * K[C] */
OP_MODK,/* A B C R[A] := R[B] % K[C] */
OP_POWK,/* A B C R[A] := R[B] ^ K[C] */
OP_DIVK,/* A B C R[A] := R[B] / K[C] */
OP_IDIVK,/* A B C R[A] := R[B] // K[C] */
OP_BANDK,/* A B C R[A] := R[B] & K[C]:integer */
OP_BORK,/* A B C R[A] := R[B] | K[C]:integer */
OP_BXORK,/* A B C R[A] := R[B] ~ K[C]:integer */
OP_SHRI,/* A B sC R[A] := R[B] >> sC */
OP_SHLI,/* A B sC R[A] := sC << R[B] */
OP_ADD,/* A B C R[A] := R[B] + R[C] */
OP_SUB,/* A B C R[A] := R[B] - R[C] */
OP_MUL,/* A B C R[A] := R[B] * R[C] */
OP_MOD,/* A B C R[A] := R[B] % R[C] */
OP_POW,/* A B C R[A] := R[B] ^ R[C] */
OP_DIV,/* A B C R[A] := R[B] / R[C] */
OP_IDIV,/* A B C R[A] := R[B] // R[C] */
OP_BAND,/* A B C R[A] := R[B] & R[C] */
OP_BOR,/* A B C R[A] := R[B] | R[C] */
OP_BXOR,/* A B C R[A] := R[B] ~ R[C] */
OP_SHL,/* A B C R[A] := R[B] << R[C] */
OP_SHR,/* A B C R[A] := R[B] >> R[C] */
OP_MMBIN,/* A B C call C metamethod over R[A] and R[B] */
OP_MMBINI,/* A sB C k call C metamethod over R[A] and sB */
OP_MMBINK,/* A B C k call C metamethod over R[A] and K[B] */
OP_UNM,/* A B R[A] := -R[B] */
OP_BNOT,/* A B R[A] := ~R[B] */
OP_NOT,/* A B R[A] := not R[B] */
OP_LEN,/* A B R[A] := length of R[B] */
OP_CONCAT,/* A B R[A] := R[A].. ... ..R[A + B - 1] */
OP_CLOSE,/* A close all upvalues >= R[A] */
OP_TBC,/* A mark variable A "to be closed" */
OP_JMP,/* sJ pc += sJ */
OP_EQ,/* A B k if ((R[A] == R[B]) ~= k) then pc++ */
OP_LT,/* A B k if ((R[A] < R[B]) ~= k) then pc++ */
OP_LE,/* A B k if ((R[A] <= R[B]) ~= k) then pc++ */
OP_EQK,/* A B k if ((R[A] == K[B]) ~= k) then pc++ */
OP_EQI,/* A sB k if ((R[A] == sB) ~= k) then pc++ */
OP_LTI,/* A sB k if ((R[A] < sB) ~= k) then pc++ */
OP_LEI,/* A sB k if ((R[A] <= sB) ~= k) then pc++ */
OP_GTI,/* A sB k if ((R[A] > sB) ~= k) then pc++ */
OP_GEI,/* A sB k if ((R[A] >= sB) ~= k) then pc++ */
OP_TEST,/* A k if (not R[A] == k) then pc++ */
OP_TESTSET,/* A B k if (not R[B] == k) then pc++ else R[A] := R[B] */
OP_CALL,/* A B C R[A], ... ,R[A+C-2] := R[A](R[A+1], ... ,R[A+B-1]) */
OP_TAILCALL,/* A B C k return R[A](R[A+1], ... ,R[A+B-1]) */
OP_RETURN,/* A B C k return R[A], ... ,R[A+B-2] (see note) */
OP_RETURN0,/* return */
OP_RETURN1,/* A return R[A] */
OP_FORLOOP,/* A Bx update counters; if loop continues then pc-=Bx; */
OP_FORPREP,/* A Bx <check values and prepare counters>;
if not to run then pc+=Bx+1; */
OP_TFORPREP,/* A Bx create upvalue for R[A + 3]; pc+=Bx */
OP_TFORCALL,/* A C R[A+4], ... ,R[A+3+C] := R[A](R[A+1], R[A+2]); */
OP_TFORLOOP,/* A Bx if R[A+2] ~= nil then { R[A]=R[A+2]; pc -= Bx } */
OP_SETLIST,/* A B C k R[A][(C-1)*FPF+i] := R[A+i], 1 <= i <= B */
OP_CLOSURE,/* A Bx R[A] := closure(KPROTO[Bx]) */
OP_VARARG,/* A C R[A], R[A+1], ..., R[A+C-2] = vararg */
OP_VARARGPREP,/*A (adjust vararg parameters) */
OP_EXTRAARG/* Ax extra (larger) argument for previous opcode */
} OpCode;
#define NUM_OPCODES ((int)(OP_EXTRAARG) + 1)
/*===========================================================================
Notes:
(*) In OP_CALL, if (B == 0) then B = top - A. If (C == 0), then
'top' is set to last_result+1, so next open instruction (OP_CALL,
OP_RETURN*, OP_SETLIST) may use 'top'.
(*) In OP_VARARG, if (C == 0) then use actual number of varargs and
set top (like in OP_CALL with C == 0).
(*) In OP_RETURN, if (B == 0) then return up to 'top'.
(*) In OP_LOADKX and OP_NEWTABLE, the next instruction is always
OP_EXTRAARG.
(*) In OP_SETLIST, if (B == 0) then real B = 'top'; if k, then
real C = EXTRAARG _ C (the bits of EXTRAARG concatenated with the
bits of C).
(*) In OP_NEWTABLE, B is log2 of the hash size (which is always a
power of 2) plus 1, or zero for size zero. If not k, the array size
is C. Otherwise, the array size is EXTRAARG _ C.
(*) For comparisons, k specifies what condition the test should accept
(true or false).
(*) In OP_MMBINI/OP_MMBINK, k means the arguments were flipped
(the constant is the first operand).
(*) All 'skips' (pc++) assume that next instruction is a jump.
(*) In instructions OP_RETURN/OP_TAILCALL, 'k' specifies that the
function builds upvalues, which may need to be closed. C > 0 means
the function is vararg, so that its 'func' must be corrected before
returning; in this case, (C - 1) is its number of fixed parameters.
(*) In comparisons with an immediate operand, C signals whether the
original operand was a float. (It must be corrected in case of
metamethods.)
===========================================================================*/
/*
** masks for instruction properties. The format is:
** bits 0-2: op mode
** bit 3: instruction set register A
** bit 4: operator is a test (next instruction must be a jump)
** bit 5: instruction uses 'L->top' set by previous instruction (when B == 0)
** bit 6: instruction sets 'L->top' for next instruction (when C == 0)
** bit 7: instruction is an MM instruction (call a metamethod)
*/
LUAI_DDEC(const lu_byte luaP_opmodes[NUM_OPCODES];)
#define getOpMode(m) (cast(enum OpMode, luaP_opmodes[m] & 7))
#define testAMode(m) (luaP_opmodes[m] & (1 << 3))
#define testTMode(m) (luaP_opmodes[m] & (1 << 4))
#define testITMode(m) (luaP_opmodes[m] & (1 << 5))
#define testOTMode(m) (luaP_opmodes[m] & (1 << 6))
#define testMMMode(m) (luaP_opmodes[m] & (1 << 7))
/* "out top" (set top for next instruction) */
#define isOT(i) \
((testOTMode(GET_OPCODE(i)) && GETARG_C(i) == 0) || \
GET_OPCODE(i) == OP_TAILCALL)
/* "in top" (uses top from previous instruction) */
#define isIT(i) (testITMode(GET_OPCODE(i)) && GETARG_B(i) == 0)
#define opmode(mm,ot,it,t,a,m) \
(((mm) << 7) | ((ot) << 6) | ((it) << 5) | ((t) << 4) | ((a) << 3) | (m))
/* number of list items to accumulate before a SETLIST instruction */
#define LFIELDS_PER_FLUSH 50
#endif
/*
** $Id: lopcodes.c $
** Opcodes for Lua virtual machine
** See Copyright Notice in lua.h
*/
#define lopcodes_c
#define LUA_CORE
#include "lprefix.h"
#include "lopcodes.h"
/* ORDER OP */
LUAI_DDEF const lu_byte luaP_opmodes[NUM_OPCODES] = {
/* MM OT IT T A mode opcode */
opmode(0, 0, 0, 0, 1, iABC) /* OP_MOVE */
,opmode(0, 0, 0, 0, 1, iAsBx) /* OP_LOADI */
,opmode(0, 0, 0, 0, 1, iAsBx) /* OP_LOADF */
,opmode(0, 0, 0, 0, 1, iABx) /* OP_LOADK */
,opmode(0, 0, 0, 0, 1, iABx) /* OP_LOADKX */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_LOADFALSE */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_LFALSESKIP */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_LOADTRUE */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_LOADNIL */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_GETUPVAL */
,opmode(0, 0, 0, 0, 0, iABC) /* OP_SETUPVAL */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_GETTABUP */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_GETTABLE */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_GETI */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_GETFIELD */
,opmode(0, 0, 0, 0, 0, iABC) /* OP_SETTABUP */
,opmode(0, 0, 0, 0, 0, iABC) /* OP_SETTABLE */
,opmode(0, 0, 0, 0, 0, iABC) /* OP_SETI */
,opmode(0, 0, 0, 0, 0, iABC) /* OP_SETFIELD */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_NEWTABLE */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_SELF */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_ADDI */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_ADDK */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_SUBK */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_MULK */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_MODK */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_POWK */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_DIVK */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_IDIVK */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_BANDK */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_BORK */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_BXORK */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_SHRI */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_SHLI */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_ADD */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_SUB */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_MUL */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_MOD */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_POW */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_DIV */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_IDIV */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_BAND */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_BOR */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_BXOR */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_SHL */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_SHR */
,opmode(1, 0, 0, 0, 0, iABC) /* OP_MMBIN */
,opmode(1, 0, 0, 0, 0, iABC) /* OP_MMBINI*/
,opmode(1, 0, 0, 0, 0, iABC) /* OP_MMBINK*/
,opmode(0, 0, 0, 0, 1, iABC) /* OP_UNM */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_BNOT */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_NOT */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_LEN */
,opmode(0, 0, 0, 0, 1, iABC) /* OP_CONCAT */
,opmode(0, 0, 0, 0, 0, iABC) /* OP_CLOSE */
,opmode(0, 0, 0, 0, 0, iABC) /* OP_TBC */
,opmode(0, 0, 0, 0, 0, isJ) /* OP_JMP */
,opmode(0, 0, 0, 1, 0, iABC) /* OP_EQ */
,opmode(0, 0, 0, 1, 0, iABC) /* OP_LT */
,opmode(0, 0, 0, 1, 0, iABC) /* OP_LE */
,opmode(0, 0, 0, 1, 0, iABC) /* OP_EQK */
,opmode(0, 0, 0, 1, 0, iABC) /* OP_EQI */
,opmode(0, 0, 0, 1, 0, iABC) /* OP_LTI */
,opmode(0, 0, 0, 1, 0, iABC) /* OP_LEI */
,opmode(0, 0, 0, 1, 0, iABC) /* OP_GTI */
,opmode(0, 0, 0, 1, 0, iABC) /* OP_GEI */
,opmode(0, 0, 0, 1, 0, iABC) /* OP_TEST */
,opmode(0, 0, 0, 1, 1, iABC) /* OP_TESTSET */
,opmode(0, 1, 1, 0, 1, iABC) /* OP_CALL */
,opmode(0, 1, 1, 0, 1, iABC) /* OP_TAILCALL */
,opmode(0, 0, 1, 0, 0, iABC) /* OP_RETURN */
,opmode(0, 0, 0, 0, 0, iABC) /* OP_RETURN0 */
,opmode(0, 0, 0, 0, 0, iABC) /* OP_RETURN1 */
,opmode(0, 0, 0, 0, 1, iABx) /* OP_FORLOOP */
,opmode(0, 0, 0, 0, 1, iABx) /* OP_FORPREP */
,opmode(0, 0, 0, 0, 0, iABx) /* OP_TFORPREP */
,opmode(0, 0, 0, 0, 0, iABC) /* OP_TFORCALL */
,opmode(0, 0, 0, 0, 1, iABx) /* OP_TFORLOOP */
,opmode(0, 0, 1, 0, 0, iABC) /* OP_SETLIST */
,opmode(0, 0, 0, 0, 1, iABx) /* OP_CLOSURE */
,opmode(0, 1, 0, 0, 1, iABC) /* OP_VARARG */
,opmode(0, 0, 1, 0, 1, iABC) /* OP_VARARGPREP */
,opmode(0, 0, 0, 0, 0, iAx) /* OP_EXTRAARG */
};
LOSLIB¶
/*
** $Id: loslib.c $
** Standard Operating System library
** See Copyright Notice in lua.h
*/
#define loslib_c
#define LUA_LIB
#include "lprefix.h"
#include <errno.h>
#include <locale.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "_native_lua_config.h" /* native Lua */
/*
** {==================================================================
** List of valid conversion specifiers for the 'strftime' function;
** options are grouped by length; group of length 2 start with '||'.
** ===================================================================
*/
#if !defined(LUA_STRFTIMEOPTIONS) /* { */
/* options for ANSI C 89 (only 1-char options) */
#define L_STRFTIMEC89 "aAbBcdHIjmMpSUwWxXyYZ%"
/* options for ISO C 99 and POSIX */
#define L_STRFTIMEC99 "aAbBcCdDeFgGhHIjmMnprRStTuUVwWxXyYzZ%" \
"||" "EcECExEXEyEY" "OdOeOHOIOmOMOSOuOUOVOwOWOy" /* two-char options */
/* options for Windows */
#define L_STRFTIMEWIN "aAbBcdHIjmMpSUwWxXyYzZ%" \
"||" "#c#x#d#H#I#j#m#M#S#U#w#W#y#Y" /* two-char options */
#if defined(LUA_USE_WINDOWS)
#define LUA_STRFTIMEOPTIONS L_STRFTIMEWIN
#elif defined(LUA_USE_C89)
#define LUA_STRFTIMEOPTIONS L_STRFTIMEC89
#else /* C99 specification */
#define LUA_STRFTIMEOPTIONS L_STRFTIMEC99
#endif
#endif /* } */
/* }================================================================== */
/*
** {==================================================================
** Configuration for time-related stuff
** ===================================================================
*/
/*
** type to represent time_t in Lua
*/
#if !defined(LUA_NUMTIME) /* { */
#define l_timet lua_Integer
#define l_pushtime(L,t) lua_pushinteger(L,(lua_Integer)(t))
#define l_gettime(L,arg) luaL_checkinteger(L, arg)
#else /* }{ */
#define l_timet lua_Number
#define l_pushtime(L,t) lua_pushnumber(L,(lua_Number)(t))
#define l_gettime(L,arg) luaL_checknumber(L, arg)
#endif /* } */
#if !defined(l_gmtime) /* { */
/*
** By default, Lua uses gmtime/localtime, except when POSIX is available,
** where it uses gmtime_r/localtime_r
*/
#if defined(LUA_USE_POSIX) /* { */
#define l_gmtime(t,r) gmtime_r(t,r)
#define l_localtime(t,r) localtime_r(t,r)
#else /* }{ */
/* ISO C definitions */
#define l_gmtime(t,r) ((void)(r)->tm_sec, gmtime(t))
#define l_localtime(t,r) ((void)(r)->tm_sec, localtime(t))
#endif /* } */
#endif /* } */
/* }================================================================== */
/*
** {==================================================================
** Configuration for 'tmpnam':
** By default, Lua uses tmpnam except when POSIX is available, where
** it uses mkstemp.
** ===================================================================
*/
#if !defined(lua_tmpnam) /* { */
#if defined(LUA_USE_POSIX) /* { */
#include <unistd.h>
#define LUA_TMPNAMBUFSIZE 32
#if !defined(LUA_TMPNAMTEMPLATE)
#define LUA_TMPNAMTEMPLATE "/tmp/lua_XXXXXX"
#endif
#define lua_tmpnam(b,e) { \
strcpy(b, LUA_TMPNAMTEMPLATE); \
e = mkstemp(b); \
if (e != -1) close(e); \
e = (e == -1); }
#else /* }{ */
/* ISO C definitions */
#define LUA_TMPNAMBUFSIZE L_tmpnam
#define lua_tmpnam(b,e) { e = (tmpnam(b) == NULL); }
#endif /* } */
#endif /* } */
/* }================================================================== */
static int os_execute (lua_State *L) {
const char *cmd = luaL_optstring(L, 1, NULL);
int stat;
errno = 0;
stat = system(cmd);
if (cmd != NULL)
return luaL_execresult(L, stat);
else {
lua_pushboolean(L, stat); /* true if there is a shell */
return 1;
}
}
static int os_remove (lua_State *L) {
const char *filename = luaL_checkstring(L, 1);
return luaL_fileresult(L, remove(filename) == 0, filename);
}
static int os_rename (lua_State *L) {
const char *fromname = luaL_checkstring(L, 1);
const char *toname = luaL_checkstring(L, 2);
return luaL_fileresult(L, rename(fromname, toname) == 0, NULL);
}
static int os_tmpname (lua_State *L) {
char buff[LUA_TMPNAMBUFSIZE];
int err;
lua_tmpnam(buff, err);
if (err)
return luaL_error(L, "unable to generate a unique filename");
lua_pushstring(L, buff);
return 1;
}
static int os_getenv (lua_State *L) {
lua_pushstring(L, getenv(luaL_checkstring(L, 1))); /* if NULL push nil */
return 1;
}
static int os_clock (lua_State *L) {
lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
return 1;
}
/*
** {======================================================
** Time/Date operations
** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
** wday=%w+1, yday=%j, isdst=? }
** =======================================================
*/
/*
** About the overflow check: an overflow cannot occur when time
** is represented by a lua_Integer, because either lua_Integer is
** large enough to represent all int fields or it is not large enough
** to represent a time that cause a field to overflow. However, if
** times are represented as doubles and lua_Integer is int, then the
** time 0x1.e1853b0d184f6p+55 would cause an overflow when adding 1900
** to compute the year.
*/
static void setfield (lua_State *L, const char *key, int value, int delta) {
#if (defined(LUA_NUMTIME) && LUA_MAXINTEGER <= INT_MAX)
if (value > LUA_MAXINTEGER - delta)
luaL_error(L, "field '%s' is out-of-bound", key);
#endif
lua_pushinteger(L, (lua_Integer)value + delta);
lua_setfield(L, -2, key);
}
static void setboolfield (lua_State *L, const char *key, int value) {
if (value < 0) /* undefined? */
return; /* does not set field */
lua_pushboolean(L, value);
lua_setfield(L, -2, key);
}
/*
** Set all fields from structure 'tm' in the table on top of the stack
*/
static void setallfields (lua_State *L, struct tm *stm) {
setfield(L, "year", stm->tm_year, 1900);
setfield(L, "month", stm->tm_mon, 1);
setfield(L, "day", stm->tm_mday, 0);
setfield(L, "hour", stm->tm_hour, 0);
setfield(L, "min", stm->tm_min, 0);
setfield(L, "sec", stm->tm_sec, 0);
setfield(L, "yday", stm->tm_yday, 1);
setfield(L, "wday", stm->tm_wday, 1);
setboolfield(L, "isdst", stm->tm_isdst);
}
static int getboolfield (lua_State *L, const char *key) {
int res;
res = (lua_getfield(L, -1, key) == LUA_TNIL) ? -1 : lua_toboolean(L, -1);
lua_pop(L, 1);
return res;
}
static int getfield (lua_State *L, const char *key, int d, int delta) {
int isnum;
int t = lua_getfield(L, -1, key); /* get field and its type */
lua_Integer res = lua_tointegerx(L, -1, &isnum);
if (!isnum) { /* field is not an integer? */
if (t != LUA_TNIL) /* some other value? */
return luaL_error(L, "field '%s' is not an integer", key);
else if (d < 0) /* absent field; no default? */
return luaL_error(L, "field '%s' missing in date table", key);
res = d;
}
else {
/* unsigned avoids overflow when lua_Integer has 32 bits */
if (!(res >= 0 ? (lua_Unsigned)res <= (lua_Unsigned)INT_MAX + delta
: (lua_Integer)INT_MIN + delta <= res))
return luaL_error(L, "field '%s' is out-of-bound", key);
res -= delta;
}
lua_pop(L, 1);
return (int)res;
}
static const char *checkoption (lua_State *L, const char *conv,
ptrdiff_t convlen, char *buff) {
const char *option = LUA_STRFTIMEOPTIONS;
int oplen = 1; /* length of options being checked */
for (; *option != '\0' && oplen <= convlen; option += oplen) {
if (*option == '|') /* next block? */
oplen++; /* will check options with next length (+1) */
else if (memcmp(conv, option, oplen) == 0) { /* match? */
memcpy(buff, conv, oplen); /* copy valid option to buffer */
buff[oplen] = '\0';
return conv + oplen; /* return next item */
}
}
luaL_argerror(L, 1,
lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv));
return conv; /* to avoid warnings */
}
static time_t l_checktime (lua_State *L, int arg) {
l_timet t = l_gettime(L, arg);
luaL_argcheck(L, (time_t)t == t, arg, "time out-of-bounds");
return (time_t)t;
}
/* maximum size for an individual 'strftime' item */
#define SIZETIMEFMT 250
static int os_date (lua_State *L) {
size_t slen;
const char *s = luaL_optlstring(L, 1, "%c", &slen);
time_t t = luaL_opt(L, l_checktime, 2, time(NULL));
const char *se = s + slen; /* 's' end */
struct tm tmr, *stm;
if (*s == '!') { /* UTC? */
stm = l_gmtime(&t, &tmr);
s++; /* skip '!' */
}
else
stm = l_localtime(&t, &tmr);
if (stm == NULL) /* invalid date? */
return luaL_error(L,
"date result cannot be represented in this installation");
if (strcmp(s, "*t") == 0) {
lua_createtable(L, 0, 9); /* 9 = number of fields */
setallfields(L, stm);
}
else {
char cc[4]; /* buffer for individual conversion specifiers */
luaL_Buffer b;
cc[0] = '%';
luaL_buffinit(L, &b);
while (s < se) {
if (*s != '%') /* not a conversion specifier? */
luaL_addchar(&b, *s++);
else {
size_t reslen;
char *buff = luaL_prepbuffsize(&b, SIZETIMEFMT);
s++; /* skip '%' */
s = checkoption(L, s, se - s, cc + 1); /* copy specifier to 'cc' */
reslen = strftime(buff, SIZETIMEFMT, cc, stm);
luaL_addsize(&b, reslen);
}
}
luaL_pushresult(&b);
}
return 1;
}
static int os_time (lua_State *L) {
time_t t;
if (lua_isnoneornil(L, 1)) /* called without args? */
t = time(NULL); /* get current time */
else {
struct tm ts;
luaL_checktype(L, 1, LUA_TTABLE);
lua_settop(L, 1); /* make sure table is at the top */
ts.tm_year = getfield(L, "year", -1, 1900);
ts.tm_mon = getfield(L, "month", -1, 1);
ts.tm_mday = getfield(L, "day", -1, 0);
ts.tm_hour = getfield(L, "hour", 12, 0);
ts.tm_min = getfield(L, "min", 0, 0);
ts.tm_sec = getfield(L, "sec", 0, 0);
ts.tm_isdst = getboolfield(L, "isdst");
t = mktime(&ts);
setallfields(L, &ts); /* update fields with normalized values */
}
if (t != (time_t)(l_timet)t || t == (time_t)(-1))
return luaL_error(L,
"time result cannot be represented in this installation");
l_pushtime(L, t);
return 1;
}
static int os_difftime (lua_State *L) {
time_t t1 = l_checktime(L, 1);
time_t t2 = l_checktime(L, 2);
lua_pushnumber(L, (lua_Number)difftime(t1, t2));
return 1;
}
/* }====================================================== */
static int os_setlocale (lua_State *L) {
static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
LC_NUMERIC, LC_TIME};
static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
"numeric", "time", NULL};
const char *l = luaL_optstring(L, 1, NULL);
int op = luaL_checkoption(L, 2, "all", catnames);
lua_pushstring(L, setlocale(cat[op], l));
return 1;
}
static int os_exit (lua_State *L) {
int status;
if (lua_isboolean(L, 1))
status = (lua_toboolean(L, 1) ? EXIT_SUCCESS : EXIT_FAILURE);
else
status = (int)luaL_optinteger(L, 1, EXIT_SUCCESS);
if (lua_toboolean(L, 2))
lua_close(L);
if (L) exit(status); /* 'if' to avoid warnings for unreachable 'return' */
return 0;
}
static const luaL_Reg syslib[] = {
{"clock", os_clock},
{"date", os_date},
{"difftime", os_difftime},
{"execute", os_execute},
{"exit", os_exit},
{"getenv", os_getenv},
{"remove", os_remove},
{"rename", os_rename},
{"setlocale", os_setlocale},
{"time", os_time},
{"tmpname", os_tmpname},
{NULL, NULL}
};
/* }====================================================== */
LUAMOD_API int luaopen_os (lua_State *L) {
luaL_newlib(L, syslib);
return 1;
}
LPARSER¶
/*
** $Id: lparser.h $
** Lua Parser
** See Copyright Notice in lua.h
*/
#ifndef lparser_h
#define lparser_h
#include "llimits.h"
#include "lobject.h"
#include "lzio.h"
#include "_native_lua_config.h" /* native Lua */
/*
** Expression and variable descriptor.
** Code generation for variables and expressions can be delayed to allow
** optimizations; An 'expdesc' structure describes a potentially-delayed
** variable/expression. It has a description of its "main" value plus a
** list of conditional jumps that can also produce its value (generated
** by short-circuit operators 'and'/'or').
*/
/* kinds of variables/expressions */
typedef enum {
VVOID, /* when 'expdesc' describes the last expression a list,
this kind means an empty list (so, no expression) */
VNIL, /* constant nil */
VTRUE, /* constant true */
VFALSE, /* constant false */
VK, /* constant in 'k'; info = index of constant in 'k' */
VKFLT, /* floating constant; nval = numerical float value */
VKINT, /* integer constant; ival = numerical integer value */
VKSTR, /* string constant; strval = TString address;
(string is fixed by the lexer) */
VNONRELOC, /* expression has its value in a fixed register;
info = result register */
VLOCAL, /* local variable; var.sidx = stack index (local register);
var.vidx = relative index in 'actvar.arr' */
VUPVAL, /* upvalue variable; info = index of upvalue in 'upvalues' */
VCONST, /* compile-time constant; info = absolute index in 'actvar.arr' */
VINDEXED, /* indexed variable;
ind.t = table register;
ind.idx = key's R index */
VINDEXUP, /* indexed upvalue;
ind.t = table upvalue;
ind.idx = key's K index */
VINDEXI, /* indexed variable with constant integer;
ind.t = table register;
ind.idx = key's value */
VINDEXSTR, /* indexed variable with literal string;
ind.t = table register;
ind.idx = key's K index */
VJMP, /* expression is a test/comparison;
info = pc of corresponding jump instruction */
VRELOC, /* expression can put result in any register;
info = instruction pc */
VCALL, /* expression is a function call; info = instruction pc */
VVARARG /* vararg expression; info = instruction pc */
} expkind;
#define vkisvar(k) (VLOCAL <= (k) && (k) <= VINDEXSTR)
#define vkisindexed(k) (VINDEXED <= (k) && (k) <= VINDEXSTR)
typedef struct expdesc {
expkind k;
union {
lua_Integer ival; /* for VKINT */
lua_Number nval; /* for VKFLT */
TString *strval; /* for VKSTR */
int info; /* for generic use */
struct { /* for indexed variables */
short idx; /* index (R or "long" K) */
lu_byte t; /* table (register or upvalue) */
} ind;
struct { /* for local variables */
lu_byte sidx; /* index in the stack */
unsigned short vidx; /* compiler index (in 'actvar.arr') */
} var;
} u;
int t; /* patch list of 'exit when true' */
int f; /* patch list of 'exit when false' */
} expdesc;
/* kinds of variables */
#define VDKREG 0 /* regular */
#define RDKCONST 1 /* constant */
#define RDKTOCLOSE 2 /* to-be-closed */
#define RDKCTC 3 /* compile-time constant */
/* description of an active local variable */
typedef union Vardesc {
struct {
TValuefields; /* constant value (if it is a compile-time constant) */
lu_byte kind;
lu_byte sidx; /* index of the variable in the stack */
short pidx; /* index of the variable in the Proto's 'locvars' array */
TString *name; /* variable name */
} vd;
TValue k; /* constant value (if any) */
} Vardesc;
/* description of pending goto statements and label statements */
typedef struct Labeldesc {
TString *name; /* label identifier */
int pc; /* position in code */
int line; /* line where it appeared */
lu_byte nactvar; /* number of active variables in that position */
lu_byte close; /* goto that escapes upvalues */
} Labeldesc;
/* list of labels or gotos */
typedef struct Labellist {
Labeldesc *arr; /* array */
int n; /* number of entries in use */
int size; /* array size */
} Labellist;
/* dynamic structures used by the parser */
typedef struct Dyndata {
struct { /* list of all active local variables */
Vardesc *arr;
int n;
int size;
} actvar;
Labellist gt; /* list of pending gotos */
Labellist label; /* list of active labels */
} Dyndata;
/* control of blocks */
struct BlockCnt; /* defined in lparser.c */
/* state needed to generate code for a given function */
typedef struct FuncState {
Proto *f; /* current function header */
struct FuncState *prev; /* enclosing function */
struct LexState *ls; /* lexical state */
struct BlockCnt *bl; /* chain of current blocks */
int pc; /* next position to code (equivalent to 'ncode') */
int lasttarget; /* 'label' of last 'jump label' */
int previousline; /* last line that was saved in 'lineinfo' */
int nk; /* number of elements in 'k' */
int np; /* number of elements in 'p' */
int nabslineinfo; /* number of elements in 'abslineinfo' */
int firstlocal; /* index of first local var (in Dyndata array) */
int firstlabel; /* index of first label (in 'dyd->label->arr') */
short ndebugvars; /* number of elements in 'f->locvars' */
lu_byte nactvar; /* number of active local variables */
lu_byte nups; /* number of upvalues */
lu_byte freereg; /* first free register */
lu_byte iwthabs; /* instructions issued since last absolute line info */
lu_byte needclose; /* function needs to close upvalues when returning */
} FuncState;
LUAI_FUNC int luaY_nvarstack (FuncState *fs);
LUAI_FUNC LClosure *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff,
Dyndata *dyd, const char *name, int firstchar);
#endif
/*
** $Id: lparser.c $
** Lua Parser
** See Copyright Notice in lua.h
*/
#define lparser_c
#define LUA_CORE
#include "lprefix.h"
#include <limits.h>
#include <string.h>
#include "lua.h"
#include "lcode.h"
#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "llex.h"
#include "lmem.h"
#include "lobject.h"
#include "lopcodes.h"
#include "lparser.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
/* maximum number of local variables per function (must be smaller
than 250, due to the bytecode format) */
#define MAXVARS 200
#define hasmultret(k) ((k) == VCALL || (k) == VVARARG)
/* because all strings are unified by the scanner, the parser
can use pointer equality for string equality */
#define eqstr(a,b) ((a) == (b))
/*
** nodes for block list (list of active blocks)
*/
typedef struct BlockCnt {
struct BlockCnt *previous; /* chain */
int firstlabel; /* index of first label in this block */
int firstgoto; /* index of first pending goto in this block */
lu_byte nactvar; /* # active locals outside the block */
lu_byte upval; /* true if some variable in the block is an upvalue */
lu_byte isloop; /* true if 'block' is a loop */
lu_byte insidetbc; /* true if inside the scope of a to-be-closed var. */
} BlockCnt;
/*
** prototypes for recursive non-terminal functions
*/
static void statement (LexState *ls);
static void expr (LexState *ls, expdesc *v);
static l_noret error_expected (LexState *ls, int token) {
luaX_syntaxerror(ls,
luaO_pushfstring(ls->L, "%s expected", luaX_token2str(ls, token)));
}
static l_noret errorlimit (FuncState *fs, int limit, const char *what) {
lua_State *L = fs->ls->L;
const char *msg;
int line = fs->f->linedefined;
const char *where = (line == 0)
? "main function"
: luaO_pushfstring(L, "function at line %d", line);
msg = luaO_pushfstring(L, "too many %s (limit is %d) in %s",
what, limit, where);
luaX_syntaxerror(fs->ls, msg);
}
static void checklimit (FuncState *fs, int v, int l, const char *what) {
if (v > l) errorlimit(fs, l, what);
}
/*
** Test whether next token is 'c'; if so, skip it.
*/
static int testnext (LexState *ls, int c) {
if (ls->t.token == c) {
luaX_next(ls);
return 1;
}
else return 0;
}
/*
** Check that next token is 'c'.
*/
static void check (LexState *ls, int c) {
if (ls->t.token != c)
error_expected(ls, c);
}
/*
** Check that next token is 'c' and skip it.
*/
static void checknext (LexState *ls, int c) {
check(ls, c);
luaX_next(ls);
}
#define check_condition(ls,c,msg) { if (!(c)) luaX_syntaxerror(ls, msg); }
/*
** Check that next token is 'what' and skip it. In case of error,
** raise an error that the expected 'what' should match a 'who'
** in line 'where' (if that is not the current line).
*/
static void check_match (LexState *ls, int what, int who, int where) {
if (unlikely(!testnext(ls, what))) {
if (where == ls->linenumber) /* all in the same line? */
error_expected(ls, what); /* do not need a complex message */
else {
luaX_syntaxerror(ls, luaO_pushfstring(ls->L,
"%s expected (to close %s at line %d)",
luaX_token2str(ls, what), luaX_token2str(ls, who), where));
}
}
}
static TString *str_checkname (LexState *ls) {
TString *ts;
check(ls, TK_NAME);
ts = ls->t.seminfo.ts;
luaX_next(ls);
return ts;
}
static void init_exp (expdesc *e, expkind k, int i) {
e->f = e->t = NO_JUMP;
e->k = k;
e->u.info = i;
}
static void codestring (expdesc *e, TString *s) {
e->f = e->t = NO_JUMP;
e->k = VKSTR;
e->u.strval = s;
}
static void codename (LexState *ls, expdesc *e) {
codestring(e, str_checkname(ls));
}
/*
** Register a new local variable in the active 'Proto' (for debug
** information).
*/
static int registerlocalvar (LexState *ls, FuncState *fs, TString *varname) {
Proto *f = fs->f;
int oldsize = f->sizelocvars;
luaM_growvector(ls->L, f->locvars, fs->ndebugvars, f->sizelocvars,
LocVar, SHRT_MAX, "local variables");
while (oldsize < f->sizelocvars)
f->locvars[oldsize++].varname = NULL;
f->locvars[fs->ndebugvars].varname = varname;
f->locvars[fs->ndebugvars].startpc = fs->pc;
luaC_objbarrier(ls->L, f, varname);
return fs->ndebugvars++;
}
/*
** Create a new local variable with the given 'name'. Return its index
** in the function.
*/
static int new_localvar (LexState *ls, TString *name) {
lua_State *L = ls->L;
FuncState *fs = ls->fs;
Dyndata *dyd = ls->dyd;
Vardesc *var;
checklimit(fs, dyd->actvar.n + 1 - fs->firstlocal,
MAXVARS, "local variables");
luaM_growvector(L, dyd->actvar.arr, dyd->actvar.n + 1,
dyd->actvar.size, Vardesc, USHRT_MAX, "local variables");
var = &dyd->actvar.arr[dyd->actvar.n++];
var->vd.kind = VDKREG; /* default */
var->vd.name = name;
return dyd->actvar.n - 1 - fs->firstlocal;
}
#define new_localvarliteral(ls,v) \
new_localvar(ls, \
luaX_newstring(ls, "" v, (sizeof(v)/sizeof(char)) - 1));
/*
** Return the "variable description" (Vardesc) of a given variable.
** (Unless noted otherwise, all variables are referred to by their
** compiler indices.)
*/
static Vardesc *getlocalvardesc (FuncState *fs, int vidx) {
return &fs->ls->dyd->actvar.arr[fs->firstlocal + vidx];
}
/*
** Convert 'nvar', a compiler index level, to it corresponding
** stack index level. For that, search for the highest variable
** below that level that is in the stack and uses its stack
** index ('sidx').
*/
static int stacklevel (FuncState *fs, int nvar) {
while (nvar-- > 0) {
Vardesc *vd = getlocalvardesc(fs, nvar); /* get variable */
if (vd->vd.kind != RDKCTC) /* is in the stack? */
return vd->vd.sidx + 1;
}
return 0; /* no variables in the stack */
}
/*
** Return the number of variables in the stack for function 'fs'
*/
int luaY_nvarstack (FuncState *fs) {
return stacklevel(fs, fs->nactvar);
}
/*
** Get the debug-information entry for current variable 'vidx'.
*/
static LocVar *localdebuginfo (FuncState *fs, int vidx) {
Vardesc *vd = getlocalvardesc(fs, vidx);
if (vd->vd.kind == RDKCTC)
return NULL; /* no debug info. for constants */
else {
int idx = vd->vd.pidx;
lua_assert(idx < fs->ndebugvars);
return &fs->f->locvars[idx];
}
}
/*
** Create an expression representing variable 'vidx'
*/
static void init_var (FuncState *fs, expdesc *e, int vidx) {
e->f = e->t = NO_JUMP;
e->k = VLOCAL;
e->u.var.vidx = vidx;
e->u.var.sidx = getlocalvardesc(fs, vidx)->vd.sidx;
}
/*
** Raises an error if variable described by 'e' is read only
*/
static void check_readonly (LexState *ls, expdesc *e) {
FuncState *fs = ls->fs;
TString *varname = NULL; /* to be set if variable is const */
switch (e->k) {
case VCONST: {
varname = ls->dyd->actvar.arr[e->u.info].vd.name;
break;
}
case VLOCAL: {
Vardesc *vardesc = getlocalvardesc(fs, e->u.var.vidx);
if (vardesc->vd.kind != VDKREG) /* not a regular variable? */
varname = vardesc->vd.name;
break;
}
case VUPVAL: {
Upvaldesc *up = &fs->f->upvalues[e->u.info];
if (up->kind != VDKREG)
varname = up->name;
break;
}
default:
return; /* other cases cannot be read-only */
}
if (varname) {
const char *msg = luaO_pushfstring(ls->L,
"attempt to assign to const variable '%s'", getstr(varname));
luaK_semerror(ls, msg); /* error */
}
}
/*
** Start the scope for the last 'nvars' created variables.
*/
static void adjustlocalvars (LexState *ls, int nvars) {
FuncState *fs = ls->fs;
int stklevel = luaY_nvarstack(fs);
int i;
for (i = 0; i < nvars; i++) {
int vidx = fs->nactvar++;
Vardesc *var = getlocalvardesc(fs, vidx);
var->vd.sidx = stklevel++;
var->vd.pidx = registerlocalvar(ls, fs, var->vd.name);
}
}
/*
** Close the scope for all variables up to level 'tolevel'.
** (debug info.)
*/
static void removevars (FuncState *fs, int tolevel) {
fs->ls->dyd->actvar.n -= (fs->nactvar - tolevel);
while (fs->nactvar > tolevel) {
LocVar *var = localdebuginfo(fs, --fs->nactvar);
if (var) /* does it have debug information? */
var->endpc = fs->pc;
}
}
/*
** Search the upvalues of the function 'fs' for one
** with the given 'name'.
*/
static int searchupvalue (FuncState *fs, TString *name) {
int i;
Upvaldesc *up = fs->f->upvalues;
for (i = 0; i < fs->nups; i++) {
if (eqstr(up[i].name, name)) return i;
}
return -1; /* not found */
}
static Upvaldesc *allocupvalue (FuncState *fs) {
Proto *f = fs->f;
int oldsize = f->sizeupvalues;
checklimit(fs, fs->nups + 1, MAXUPVAL, "upvalues");
luaM_growvector(fs->ls->L, f->upvalues, fs->nups, f->sizeupvalues,
Upvaldesc, MAXUPVAL, "upvalues");
while (oldsize < f->sizeupvalues)
f->upvalues[oldsize++].name = NULL;
return &f->upvalues[fs->nups++];
}
static int newupvalue (FuncState *fs, TString *name, expdesc *v) {
Upvaldesc *up = allocupvalue(fs);
FuncState *prev = fs->prev;
if (v->k == VLOCAL) {
up->instack = 1;
up->idx = v->u.var.sidx;
up->kind = getlocalvardesc(prev, v->u.var.vidx)->vd.kind;
lua_assert(eqstr(name, getlocalvardesc(prev, v->u.var.vidx)->vd.name));
}
else {
up->instack = 0;
up->idx = cast_byte(v->u.info);
up->kind = prev->f->upvalues[v->u.info].kind;
lua_assert(eqstr(name, prev->f->upvalues[v->u.info].name));
}
up->name = name;
luaC_objbarrier(fs->ls->L, fs->f, name);
return fs->nups - 1;
}
/*
** Look for an active local variable with the name 'n' in the
** function 'fs'. If found, initialize 'var' with it and return
** its expression kind; otherwise return -1.
*/
static int searchvar (FuncState *fs, TString *n, expdesc *var) {
int i;
for (i = cast_int(fs->nactvar) - 1; i >= 0; i--) {
Vardesc *vd = getlocalvardesc(fs, i);
if (eqstr(n, vd->vd.name)) { /* found? */
if (vd->vd.kind == RDKCTC) /* compile-time constant? */
init_exp(var, VCONST, fs->firstlocal + i);
else /* real variable */
init_var(fs, var, i);
return var->k;
}
}
return -1; /* not found */
}
/*
** Mark block where variable at given level was defined
** (to emit close instructions later).
*/
static void markupval (FuncState *fs, int level) {
BlockCnt *bl = fs->bl;
while (bl->nactvar > level)
bl = bl->previous;
bl->upval = 1;
fs->needclose = 1;
}
/*
** Find a variable with the given name 'n'. If it is an upvalue, add
** this upvalue into all intermediate functions. If it is a global, set
** 'var' as 'void' as a flag.
*/
static void singlevaraux (FuncState *fs, TString *n, expdesc *var, int base) {
if (fs == NULL) /* no more levels? */
init_exp(var, VVOID, 0); /* default is global */
else {
int v = searchvar(fs, n, var); /* look up locals at current level */
if (v >= 0) { /* found? */
if (v == VLOCAL && !base)
markupval(fs, var->u.var.vidx); /* local will be used as an upval */
}
else { /* not found as local at current level; try upvalues */
int idx = searchupvalue(fs, n); /* try existing upvalues */
if (idx < 0) { /* not found? */
singlevaraux(fs->prev, n, var, 0); /* try upper levels */
if (var->k == VLOCAL || var->k == VUPVAL) /* local or upvalue? */
idx = newupvalue(fs, n, var); /* will be a new upvalue */
else /* it is a global or a constant */
return; /* don't need to do anything at this level */
}
init_exp(var, VUPVAL, idx); /* new or old upvalue */
}
}
}
/*
** Find a variable with the given name 'n', handling global variables
** too.
*/
static void singlevar (LexState *ls, expdesc *var) {
TString *varname = str_checkname(ls);
FuncState *fs = ls->fs;
singlevaraux(fs, varname, var, 1);
if (var->k == VVOID) { /* global name? */
expdesc key;
singlevaraux(fs, ls->envn, var, 1); /* get environment variable */
lua_assert(var->k != VVOID); /* this one must exist */
codestring(&key, varname); /* key is variable name */
luaK_indexed(fs, var, &key); /* env[varname] */
}
}
/*
** Adjust the number of results from an expression list 'e' with 'nexps'
** expressions to 'nvars' values.
*/
static void adjust_assign (LexState *ls, int nvars, int nexps, expdesc *e) {
FuncState *fs = ls->fs;
int needed = nvars - nexps; /* extra values needed */
if (hasmultret(e->k)) { /* last expression has multiple returns? */
int extra = needed + 1; /* discount last expression itself */
if (extra < 0)
extra = 0;
luaK_setreturns(fs, e, extra); /* last exp. provides the difference */
}
else {
if (e->k != VVOID) /* at least one expression? */
luaK_exp2nextreg(fs, e); /* close last expression */
if (needed > 0) /* missing values? */
luaK_nil(fs, fs->freereg, needed); /* complete with nils */
}
if (needed > 0)
luaK_reserveregs(fs, needed); /* registers for extra values */
else /* adding 'needed' is actually a subtraction */
fs->freereg += needed; /* remove extra values */
}
/*
** Macros to limit the maximum recursion depth while parsing
*/
#define enterlevel(ls) luaE_enterCcall((ls)->L)
#define leavelevel(ls) luaE_exitCcall((ls)->L)
/*
** Generates an error that a goto jumps into the scope of some
** local variable.
*/
static l_noret jumpscopeerror (LexState *ls, Labeldesc *gt) {
const char *varname = getstr(getlocalvardesc(ls->fs, gt->nactvar)->vd.name);
const char *msg = "<goto %s> at line %d jumps into the scope of local '%s'";
msg = luaO_pushfstring(ls->L, msg, getstr(gt->name), gt->line, varname);
luaK_semerror(ls, msg); /* raise the error */
}
/*
** Solves the goto at index 'g' to given 'label' and removes it
** from the list of pending goto's.
** If it jumps into the scope of some variable, raises an error.
*/
static void solvegoto (LexState *ls, int g, Labeldesc *label) {
int i;
Labellist *gl = &ls->dyd->gt; /* list of goto's */
Labeldesc *gt = &gl->arr[g]; /* goto to be resolved */
lua_assert(eqstr(gt->name, label->name));
if (unlikely(gt->nactvar < label->nactvar)) /* enter some scope? */
jumpscopeerror(ls, gt);
luaK_patchlist(ls->fs, gt->pc, label->pc);
for (i = g; i < gl->n - 1; i++) /* remove goto from pending list */
gl->arr[i] = gl->arr[i + 1];
gl->n--;
}
/*
** Search for an active label with the given name.
*/
static Labeldesc *findlabel (LexState *ls, TString *name) {
int i;
Dyndata *dyd = ls->dyd;
/* check labels in current function for a match */
for (i = ls->fs->firstlabel; i < dyd->label.n; i++) {
Labeldesc *lb = &dyd->label.arr[i];
if (eqstr(lb->name, name)) /* correct label? */
return lb;
}
return NULL; /* label not found */
}
/*
** Adds a new label/goto in the corresponding list.
*/
static int newlabelentry (LexState *ls, Labellist *l, TString *name,
int line, int pc) {
int n = l->n;
luaM_growvector(ls->L, l->arr, n, l->size,
Labeldesc, SHRT_MAX, "labels/gotos");
l->arr[n].name = name;
l->arr[n].line = line;
l->arr[n].nactvar = ls->fs->nactvar;
l->arr[n].close = 0;
l->arr[n].pc = pc;
l->n = n + 1;
return n;
}
static int newgotoentry (LexState *ls, TString *name, int line, int pc) {
return newlabelentry(ls, &ls->dyd->gt, name, line, pc);
}
/*
** Solves forward jumps. Check whether new label 'lb' matches any
** pending gotos in current block and solves them. Return true
** if any of the goto's need to close upvalues.
*/
static int solvegotos (LexState *ls, Labeldesc *lb) {
Labellist *gl = &ls->dyd->gt;
int i = ls->fs->bl->firstgoto;
int needsclose = 0;
while (i < gl->n) {
if (eqstr(gl->arr[i].name, lb->name)) {
needsclose |= gl->arr[i].close;
solvegoto(ls, i, lb); /* will remove 'i' from the list */
}
else
i++;
}
return needsclose;
}
/*
** Create a new label with the given 'name' at the given 'line'.
** 'last' tells whether label is the last non-op statement in its
** block. Solves all pending goto's to this new label and adds
** a close instruction if necessary.
** Returns true iff it added a close instruction.
*/
static int createlabel (LexState *ls, TString *name, int line,
int last) {
FuncState *fs = ls->fs;
Labellist *ll = &ls->dyd->label;
int l = newlabelentry(ls, ll, name, line, luaK_getlabel(fs));
if (last) { /* label is last no-op statement in the block? */
/* assume that locals are already out of scope */
ll->arr[l].nactvar = fs->bl->nactvar;
}
if (solvegotos(ls, &ll->arr[l])) { /* need close? */
luaK_codeABC(fs, OP_CLOSE, luaY_nvarstack(fs), 0, 0);
return 1;
}
return 0;
}
/*
** Adjust pending gotos to outer level of a block.
*/
static void movegotosout (FuncState *fs, BlockCnt *bl) {
int i;
Labellist *gl = &fs->ls->dyd->gt;
/* correct pending gotos to current block */
for (i = bl->firstgoto; i < gl->n; i++) { /* for each pending goto */
Labeldesc *gt = &gl->arr[i];
/* leaving a variable scope? */
if (stacklevel(fs, gt->nactvar) > stacklevel(fs, bl->nactvar))
gt->close |= bl->upval; /* jump may need a close */
gt->nactvar = bl->nactvar; /* update goto level */
}
}
static void enterblock (FuncState *fs, BlockCnt *bl, lu_byte isloop) {
bl->isloop = isloop;
bl->nactvar = fs->nactvar;
bl->firstlabel = fs->ls->dyd->label.n;
bl->firstgoto = fs->ls->dyd->gt.n;
bl->upval = 0;
bl->insidetbc = (fs->bl != NULL && fs->bl->insidetbc);
bl->previous = fs->bl;
fs->bl = bl;
lua_assert(fs->freereg == luaY_nvarstack(fs));
}
/*
** generates an error for an undefined 'goto'.
*/
static l_noret undefgoto (LexState *ls, Labeldesc *gt) {
const char *msg;
if (eqstr(gt->name, luaS_newliteral(ls->L, "break"))) {
msg = "break outside loop at line %d";
msg = luaO_pushfstring(ls->L, msg, gt->line);
}
else {
msg = "no visible label '%s' for <goto> at line %d";
msg = luaO_pushfstring(ls->L, msg, getstr(gt->name), gt->line);
}
luaK_semerror(ls, msg);
}
static void leaveblock (FuncState *fs) {
BlockCnt *bl = fs->bl;
LexState *ls = fs->ls;
int hasclose = 0;
int stklevel = stacklevel(fs, bl->nactvar); /* level outside the block */
if (bl->isloop) /* fix pending breaks? */
hasclose = createlabel(ls, luaS_newliteral(ls->L, "break"), 0, 0);
if (!hasclose && bl->previous && bl->upval)
luaK_codeABC(fs, OP_CLOSE, stklevel, 0, 0);
fs->bl = bl->previous;
removevars(fs, bl->nactvar);
lua_assert(bl->nactvar == fs->nactvar);
fs->freereg = stklevel; /* free registers */
ls->dyd->label.n = bl->firstlabel; /* remove local labels */
if (bl->previous) /* inner block? */
movegotosout(fs, bl); /* update pending gotos to outer block */
else {
if (bl->firstgoto < ls->dyd->gt.n) /* pending gotos in outer block? */
undefgoto(ls, &ls->dyd->gt.arr[bl->firstgoto]); /* error */
}
}
/*
** adds a new prototype into list of prototypes
*/
static Proto *addprototype (LexState *ls) {
Proto *clp;
lua_State *L = ls->L;
FuncState *fs = ls->fs;
Proto *f = fs->f; /* prototype of current function */
if (fs->np >= f->sizep) {
int oldsize = f->sizep;
luaM_growvector(L, f->p, fs->np, f->sizep, Proto *, MAXARG_Bx, "functions");
while (oldsize < f->sizep)
f->p[oldsize++] = NULL;
}
f->p[fs->np++] = clp = luaF_newproto(L);
luaC_objbarrier(L, f, clp);
return clp;
}
/*
** codes instruction to create new closure in parent function.
** The OP_CLOSURE instruction uses the last available register,
** so that, if it invokes the GC, the GC knows which registers
** are in use at that time.
*/
static void codeclosure (LexState *ls, expdesc *v) {
FuncState *fs = ls->fs->prev;
init_exp(v, VRELOC, luaK_codeABx(fs, OP_CLOSURE, 0, fs->np - 1));
luaK_exp2nextreg(fs, v); /* fix it at the last register */
}
static void open_func (LexState *ls, FuncState *fs, BlockCnt *bl) {
Proto *f = fs->f;
fs->prev = ls->fs; /* linked list of funcstates */
fs->ls = ls;
ls->fs = fs;
fs->pc = 0;
fs->previousline = f->linedefined;
fs->iwthabs = 0;
fs->lasttarget = 0;
fs->freereg = 0;
fs->nk = 0;
fs->nabslineinfo = 0;
fs->np = 0;
fs->nups = 0;
fs->ndebugvars = 0;
fs->nactvar = 0;
fs->needclose = 0;
fs->firstlocal = ls->dyd->actvar.n;
fs->firstlabel = ls->dyd->label.n;
fs->bl = NULL;
f->source = ls->source;
luaC_objbarrier(ls->L, f, f->source);
f->maxstacksize = 2; /* registers 0/1 are always valid */
enterblock(fs, bl, 0);
}
static void close_func (LexState *ls) {
lua_State *L = ls->L;
FuncState *fs = ls->fs;
Proto *f = fs->f;
luaK_ret(fs, luaY_nvarstack(fs), 0); /* final return */
leaveblock(fs);
lua_assert(fs->bl == NULL);
luaK_finish(fs);
luaM_shrinkvector(L, f->code, f->sizecode, fs->pc, Instruction);
luaM_shrinkvector(L, f->lineinfo, f->sizelineinfo, fs->pc, ls_byte);
luaM_shrinkvector(L, f->abslineinfo, f->sizeabslineinfo,
fs->nabslineinfo, AbsLineInfo);
luaM_shrinkvector(L, f->k, f->sizek, fs->nk, TValue);
luaM_shrinkvector(L, f->p, f->sizep, fs->np, Proto *);
luaM_shrinkvector(L, f->locvars, f->sizelocvars, fs->ndebugvars, LocVar);
luaM_shrinkvector(L, f->upvalues, f->sizeupvalues, fs->nups, Upvaldesc);
ls->fs = fs->prev;
luaC_checkGC(L);
}
/*============================================================*/
/* GRAMMAR RULES */
/*============================================================*/
/*
** check whether current token is in the follow set of a block.
** 'until' closes syntactical blocks, but do not close scope,
** so it is handled in separate.
*/
static int block_follow (LexState *ls, int withuntil) {
switch (ls->t.token) {
case TK_ELSE: case TK_ELSEIF:
case TK_END: case TK_EOS:
return 1;
case TK_UNTIL: return withuntil;
default: return 0;
}
}
static void statlist (LexState *ls) {
/* statlist -> { stat [';'] } */
while (!block_follow(ls, 1)) {
if (ls->t.token == TK_RETURN) {
statement(ls);
return; /* 'return' must be last statement */
}
statement(ls);
}
}
static void fieldsel (LexState *ls, expdesc *v) {
/* fieldsel -> ['.' | ':'] NAME */
FuncState *fs = ls->fs;
expdesc key;
luaK_exp2anyregup(fs, v);
luaX_next(ls); /* skip the dot or colon */
codename(ls, &key);
luaK_indexed(fs, v, &key);
}
static void yindex (LexState *ls, expdesc *v) {
/* index -> '[' expr ']' */
luaX_next(ls); /* skip the '[' */
expr(ls, v);
luaK_exp2val(ls->fs, v);
checknext(ls, ']');
}
/*
** {======================================================================
** Rules for Constructors
** =======================================================================
*/
typedef struct ConsControl {
expdesc v; /* last list item read */
expdesc *t; /* table descriptor */
int nh; /* total number of 'record' elements */
int na; /* number of array elements already stored */
int tostore; /* number of array elements pending to be stored */
} ConsControl;
static void recfield (LexState *ls, ConsControl *cc) {
/* recfield -> (NAME | '['exp']') = exp */
FuncState *fs = ls->fs;
int reg = ls->fs->freereg;
expdesc tab, key, val;
if (ls->t.token == TK_NAME) {
checklimit(fs, cc->nh, MAX_INT, "items in a constructor");
codename(ls, &key);
}
else /* ls->t.token == '[' */
yindex(ls, &key);
cc->nh++;
checknext(ls, '=');
tab = *cc->t;
luaK_indexed(fs, &tab, &key);
expr(ls, &val);
luaK_storevar(fs, &tab, &val);
fs->freereg = reg; /* free registers */
}
static void closelistfield (FuncState *fs, ConsControl *cc) {
if (cc->v.k == VVOID) return; /* there is no list item */
luaK_exp2nextreg(fs, &cc->v);
cc->v.k = VVOID;
if (cc->tostore == LFIELDS_PER_FLUSH) {
luaK_setlist(fs, cc->t->u.info, cc->na, cc->tostore); /* flush */
cc->na += cc->tostore;
cc->tostore = 0; /* no more items pending */
}
}
static void lastlistfield (FuncState *fs, ConsControl *cc) {
if (cc->tostore == 0) return;
if (hasmultret(cc->v.k)) {
luaK_setmultret(fs, &cc->v);
luaK_setlist(fs, cc->t->u.info, cc->na, LUA_MULTRET);
cc->na--; /* do not count last expression (unknown number of elements) */
}
else {
if (cc->v.k != VVOID)
luaK_exp2nextreg(fs, &cc->v);
luaK_setlist(fs, cc->t->u.info, cc->na, cc->tostore);
}
cc->na += cc->tostore;
}
static void listfield (LexState *ls, ConsControl *cc) {
/* listfield -> exp */
expr(ls, &cc->v);
cc->tostore++;
}
static void field (LexState *ls, ConsControl *cc) {
/* field -> listfield | recfield */
switch(ls->t.token) {
case TK_NAME: { /* may be 'listfield' or 'recfield' */
if (luaX_lookahead(ls) != '=') /* expression? */
listfield(ls, cc);
else
recfield(ls, cc);
break;
}
case '[': {
recfield(ls, cc);
break;
}
default: {
listfield(ls, cc);
break;
}
}
}
static void constructor (LexState *ls, expdesc *t) {
/* constructor -> '{' [ field { sep field } [sep] ] '}'
sep -> ',' | ';' */
FuncState *fs = ls->fs;
int line = ls->linenumber;
int pc = luaK_codeABC(fs, OP_NEWTABLE, 0, 0, 0);
ConsControl cc;
luaK_code(fs, 0); /* space for extra arg. */
cc.na = cc.nh = cc.tostore = 0;
cc.t = t;
init_exp(t, VNONRELOC, fs->freereg); /* table will be at stack top */
luaK_reserveregs(fs, 1);
init_exp(&cc.v, VVOID, 0); /* no value (yet) */
checknext(ls, '{');
do {
lua_assert(cc.v.k == VVOID || cc.tostore > 0);
if (ls->t.token == '}') break;
closelistfield(fs, &cc);
field(ls, &cc);
} while (testnext(ls, ',') || testnext(ls, ';'));
check_match(ls, '}', '{', line);
lastlistfield(fs, &cc);
luaK_settablesize(fs, pc, t->u.info, cc.na, cc.nh);
}
/* }====================================================================== */
static void setvararg (FuncState *fs, int nparams) {
fs->f->is_vararg = 1;
luaK_codeABC(fs, OP_VARARGPREP, nparams, 0, 0);
}
static void parlist (LexState *ls) {
/* parlist -> [ param { ',' param } ] */
FuncState *fs = ls->fs;
Proto *f = fs->f;
int nparams = 0;
int isvararg = 0;
if (ls->t.token != ')') { /* is 'parlist' not empty? */
do {
switch (ls->t.token) {
case TK_NAME: { /* param -> NAME */
new_localvar(ls, str_checkname(ls));
nparams++;
break;
}
case TK_DOTS: { /* param -> '...' */
luaX_next(ls);
isvararg = 1;
break;
}
default: luaX_syntaxerror(ls, "<name> or '...' expected");
}
} while (!isvararg && testnext(ls, ','));
}
adjustlocalvars(ls, nparams);
f->numparams = cast_byte(fs->nactvar);
if (isvararg)
setvararg(fs, f->numparams); /* declared vararg */
luaK_reserveregs(fs, fs->nactvar); /* reserve registers for parameters */
}
static void body (LexState *ls, expdesc *e, int ismethod, int line) {
/* body -> '(' parlist ')' block END */
FuncState new_fs;
BlockCnt bl;
new_fs.f = addprototype(ls);
new_fs.f->linedefined = line;
open_func(ls, &new_fs, &bl);
checknext(ls, '(');
if (ismethod) {
new_localvarliteral(ls, "self"); /* create 'self' parameter */
adjustlocalvars(ls, 1);
}
parlist(ls);
checknext(ls, ')');
statlist(ls);
new_fs.f->lastlinedefined = ls->linenumber;
check_match(ls, TK_END, TK_FUNCTION, line);
codeclosure(ls, e);
close_func(ls);
}
static int explist (LexState *ls, expdesc *v) {
/* explist -> expr { ',' expr } */
int n = 1; /* at least one expression */
expr(ls, v);
while (testnext(ls, ',')) {
luaK_exp2nextreg(ls->fs, v);
expr(ls, v);
n++;
}
return n;
}
static void funcargs (LexState *ls, expdesc *f, int line) {
FuncState *fs = ls->fs;
expdesc args;
int base, nparams;
switch (ls->t.token) {
case '(': { /* funcargs -> '(' [ explist ] ')' */
luaX_next(ls);
if (ls->t.token == ')') /* arg list is empty? */
args.k = VVOID;
else {
explist(ls, &args);
if (hasmultret(args.k))
luaK_setmultret(fs, &args);
}
check_match(ls, ')', '(', line);
break;
}
case '{': { /* funcargs -> constructor */
constructor(ls, &args);
break;
}
case TK_STRING: { /* funcargs -> STRING */
codestring(&args, ls->t.seminfo.ts);
luaX_next(ls); /* must use 'seminfo' before 'next' */
break;
}
default: {
luaX_syntaxerror(ls, "function arguments expected");
}
}
lua_assert(f->k == VNONRELOC);
base = f->u.info; /* base register for call */
if (hasmultret(args.k))
nparams = LUA_MULTRET; /* open call */
else {
if (args.k != VVOID)
luaK_exp2nextreg(fs, &args); /* close last argument */
nparams = fs->freereg - (base+1);
}
init_exp(f, VCALL, luaK_codeABC(fs, OP_CALL, base, nparams+1, 2));
luaK_fixline(fs, line);
fs->freereg = base+1; /* call remove function and arguments and leaves
(unless changed) one result */
}
/*
** {======================================================================
** Expression parsing
** =======================================================================
*/
static void primaryexp (LexState *ls, expdesc *v) {
/* primaryexp -> NAME | '(' expr ')' */
switch (ls->t.token) {
case '(': {
int line = ls->linenumber;
luaX_next(ls);
expr(ls, v);
check_match(ls, ')', '(', line);
luaK_dischargevars(ls->fs, v);
return;
}
case TK_NAME: {
singlevar(ls, v);
return;
}
default: {
luaX_syntaxerror(ls, "unexpected symbol");
}
}
}
static void suffixedexp (LexState *ls, expdesc *v) {
/* suffixedexp ->
primaryexp { '.' NAME | '[' exp ']' | ':' NAME funcargs | funcargs } */
FuncState *fs = ls->fs;
int line = ls->linenumber;
primaryexp(ls, v);
for (;;) {
switch (ls->t.token) {
case '.': { /* fieldsel */
fieldsel(ls, v);
break;
}
case '[': { /* '[' exp ']' */
expdesc key;
luaK_exp2anyregup(fs, v);
yindex(ls, &key);
luaK_indexed(fs, v, &key);
break;
}
case ':': { /* ':' NAME funcargs */
expdesc key;
luaX_next(ls);
codename(ls, &key);
luaK_self(fs, v, &key);
funcargs(ls, v, line);
break;
}
case '(': case TK_STRING: case '{': { /* funcargs */
luaK_exp2nextreg(fs, v);
funcargs(ls, v, line);
break;
}
default: return;
}
}
}
static void simpleexp (LexState *ls, expdesc *v) {
/* simpleexp -> FLT | INT | STRING | NIL | TRUE | FALSE | ... |
constructor | FUNCTION body | suffixedexp */
switch (ls->t.token) {
case TK_FLT: {
init_exp(v, VKFLT, 0);
v->u.nval = ls->t.seminfo.r;
break;
}
case TK_INT: {
init_exp(v, VKINT, 0);
v->u.ival = ls->t.seminfo.i;
break;
}
case TK_STRING: {
codestring(v, ls->t.seminfo.ts);
break;
}
case TK_NIL: {
init_exp(v, VNIL, 0);
break;
}
case TK_TRUE: {
init_exp(v, VTRUE, 0);
break;
}
case TK_FALSE: {
init_exp(v, VFALSE, 0);
break;
}
case TK_DOTS: { /* vararg */
FuncState *fs = ls->fs;
check_condition(ls, fs->f->is_vararg,
"cannot use '...' outside a vararg function");
init_exp(v, VVARARG, luaK_codeABC(fs, OP_VARARG, 0, 0, 1));
break;
}
case '{': { /* constructor */
constructor(ls, v);
return;
}
case TK_FUNCTION: {
luaX_next(ls);
body(ls, v, 0, ls->linenumber);
return;
}
default: {
suffixedexp(ls, v);
return;
}
}
luaX_next(ls);
}
static UnOpr getunopr (int op) {
switch (op) {
case TK_NOT: return OPR_NOT;
case '-': return OPR_MINUS;
case '~': return OPR_BNOT;
case '#': return OPR_LEN;
default: return OPR_NOUNOPR;
}
}
static BinOpr getbinopr (int op) {
switch (op) {
case '+': return OPR_ADD;
case '-': return OPR_SUB;
case '*': return OPR_MUL;
case '%': return OPR_MOD;
case '^': return OPR_POW;
case '/': return OPR_DIV;
case TK_IDIV: return OPR_IDIV;
case '&': return OPR_BAND;
case '|': return OPR_BOR;
case '~': return OPR_BXOR;
case TK_SHL: return OPR_SHL;
case TK_SHR: return OPR_SHR;
case TK_CONCAT: return OPR_CONCAT;
case TK_NE: return OPR_NE;
case TK_EQ: return OPR_EQ;
case '<': return OPR_LT;
case TK_LE: return OPR_LE;
case '>': return OPR_GT;
case TK_GE: return OPR_GE;
case TK_AND: return OPR_AND;
case TK_OR: return OPR_OR;
default: return OPR_NOBINOPR;
}
}
/*
** Priority table for binary operators.
*/
static const struct {
lu_byte left; /* left priority for each binary operator */
lu_byte right; /* right priority */
} priority[] = { /* ORDER OPR */
{10, 10}, {10, 10}, /* '+' '-' */
{11, 11}, {11, 11}, /* '*' '%' */
{14, 13}, /* '^' (right associative) */
{11, 11}, {11, 11}, /* '/' '//' */
{6, 6}, {4, 4}, {5, 5}, /* '&' '|' '~' */
{7, 7}, {7, 7}, /* '<<' '>>' */
{9, 8}, /* '..' (right associative) */
{3, 3}, {3, 3}, {3, 3}, /* ==, <, <= */
{3, 3}, {3, 3}, {3, 3}, /* ~=, >, >= */
{2, 2}, {1, 1} /* and, or */
};
#define UNARY_PRIORITY 12 /* priority for unary operators */
/*
** subexpr -> (simpleexp | unop subexpr) { binop subexpr }
** where 'binop' is any binary operator with a priority higher than 'limit'
*/
static BinOpr subexpr (LexState *ls, expdesc *v, int limit) {
BinOpr op;
UnOpr uop;
enterlevel(ls);
uop = getunopr(ls->t.token);
if (uop != OPR_NOUNOPR) { /* prefix (unary) operator? */
int line = ls->linenumber;
luaX_next(ls); /* skip operator */
subexpr(ls, v, UNARY_PRIORITY);
luaK_prefix(ls->fs, uop, v, line);
}
else simpleexp(ls, v);
/* expand while operators have priorities higher than 'limit' */
op = getbinopr(ls->t.token);
while (op != OPR_NOBINOPR && priority[op].left > limit) {
expdesc v2;
BinOpr nextop;
int line = ls->linenumber;
luaX_next(ls); /* skip operator */
luaK_infix(ls->fs, op, v);
/* read sub-expression with higher priority */
nextop = subexpr(ls, &v2, priority[op].right);
luaK_posfix(ls->fs, op, v, &v2, line);
op = nextop;
}
leavelevel(ls);
return op; /* return first untreated operator */
}
static void expr (LexState *ls, expdesc *v) {
subexpr(ls, v, 0);
}
/* }==================================================================== */
/*
** {======================================================================
** Rules for Statements
** =======================================================================
*/
static void block (LexState *ls) {
/* block -> statlist */
FuncState *fs = ls->fs;
BlockCnt bl;
enterblock(fs, &bl, 0);
statlist(ls);
leaveblock(fs);
}
/*
** structure to chain all variables in the left-hand side of an
** assignment
*/
struct LHS_assign {
struct LHS_assign *prev;
expdesc v; /* variable (global, local, upvalue, or indexed) */
};
/*
** check whether, in an assignment to an upvalue/local variable, the
** upvalue/local variable is begin used in a previous assignment to a
** table. If so, save original upvalue/local value in a safe place and
** use this safe copy in the previous assignment.
*/
static void check_conflict (LexState *ls, struct LHS_assign *lh, expdesc *v) {
FuncState *fs = ls->fs;
int extra = fs->freereg; /* eventual position to save local variable */
int conflict = 0;
for (; lh; lh = lh->prev) { /* check all previous assignments */
if (vkisindexed(lh->v.k)) { /* assignment to table field? */
if (lh->v.k == VINDEXUP) { /* is table an upvalue? */
if (v->k == VUPVAL && lh->v.u.ind.t == v->u.info) {
conflict = 1; /* table is the upvalue being assigned now */
lh->v.k = VINDEXSTR;
lh->v.u.ind.t = extra; /* assignment will use safe copy */
}
}
else { /* table is a register */
if (v->k == VLOCAL && lh->v.u.ind.t == v->u.var.sidx) {
conflict = 1; /* table is the local being assigned now */
lh->v.u.ind.t = extra; /* assignment will use safe copy */
}
/* is index the local being assigned? */
if (lh->v.k == VINDEXED && v->k == VLOCAL &&
lh->v.u.ind.idx == v->u.var.sidx) {
conflict = 1;
lh->v.u.ind.idx = extra; /* previous assignment will use safe copy */
}
}
}
}
if (conflict) {
/* copy upvalue/local value to a temporary (in position 'extra') */
if (v->k == VLOCAL)
luaK_codeABC(fs, OP_MOVE, extra, v->u.var.sidx, 0);
else
luaK_codeABC(fs, OP_GETUPVAL, extra, v->u.info, 0);
luaK_reserveregs(fs, 1);
}
}
/*
** Parse and compile a multiple assignment. The first "variable"
** (a 'suffixedexp') was already read by the caller.
**
** assignment -> suffixedexp restassign
** restassign -> ',' suffixedexp restassign | '=' explist
*/
static void restassign (LexState *ls, struct LHS_assign *lh, int nvars) {
expdesc e;
check_condition(ls, vkisvar(lh->v.k), "syntax error");
check_readonly(ls, &lh->v);
if (testnext(ls, ',')) { /* restassign -> ',' suffixedexp restassign */
struct LHS_assign nv;
nv.prev = lh;
suffixedexp(ls, &nv.v);
if (!vkisindexed(nv.v.k))
check_conflict(ls, lh, &nv.v);
enterlevel(ls); /* control recursion depth */
restassign(ls, &nv, nvars+1);
leavelevel(ls);
}
else { /* restassign -> '=' explist */
int nexps;
checknext(ls, '=');
nexps = explist(ls, &e);
if (nexps != nvars)
adjust_assign(ls, nvars, nexps, &e);
else {
luaK_setoneret(ls->fs, &e); /* close last expression */
luaK_storevar(ls->fs, &lh->v, &e);
return; /* avoid default */
}
}
init_exp(&e, VNONRELOC, ls->fs->freereg-1); /* default assignment */
luaK_storevar(ls->fs, &lh->v, &e);
}
static int cond (LexState *ls) {
/* cond -> exp */
expdesc v;
expr(ls, &v); /* read condition */
if (v.k == VNIL) v.k = VFALSE; /* 'falses' are all equal here */
luaK_goiftrue(ls->fs, &v);
return v.f;
}
static void gotostat (LexState *ls) {
FuncState *fs = ls->fs;
int line = ls->linenumber;
TString *name = str_checkname(ls); /* label's name */
Labeldesc *lb = findlabel(ls, name);
if (lb == NULL) /* no label? */
/* forward jump; will be resolved when the label is declared */
newgotoentry(ls, name, line, luaK_jump(fs));
else { /* found a label */
/* backward jump; will be resolved here */
int lblevel = stacklevel(fs, lb->nactvar); /* label level */
if (luaY_nvarstack(fs) > lblevel) /* leaving the scope of a variable? */
luaK_codeABC(fs, OP_CLOSE, lblevel, 0, 0);
/* create jump and link it to the label */
luaK_patchlist(fs, luaK_jump(fs), lb->pc);
}
}
/*
** Break statement. Semantically equivalent to "goto break".
*/
static void breakstat (LexState *ls) {
int line = ls->linenumber;
luaX_next(ls); /* skip break */
newgotoentry(ls, luaS_newliteral(ls->L, "break"), line, luaK_jump(ls->fs));
}
/*
** Check whether there is already a label with the given 'name'.
*/
static void checkrepeated (LexState *ls, TString *name) {
Labeldesc *lb = findlabel(ls, name);
if (unlikely(lb != NULL)) { /* already defined? */
const char *msg = "label '%s' already defined on line %d";
msg = luaO_pushfstring(ls->L, msg, getstr(name), lb->line);
luaK_semerror(ls, msg); /* error */
}
}
static void labelstat (LexState *ls, TString *name, int line) {
/* label -> '::' NAME '::' */
checknext(ls, TK_DBCOLON); /* skip double colon */
while (ls->t.token == ';' || ls->t.token == TK_DBCOLON)
statement(ls); /* skip other no-op statements */
checkrepeated(ls, name); /* check for repeated labels */
createlabel(ls, name, line, block_follow(ls, 0));
}
static void whilestat (LexState *ls, int line) {
/* whilestat -> WHILE cond DO block END */
FuncState *fs = ls->fs;
int whileinit;
int condexit;
BlockCnt bl;
luaX_next(ls); /* skip WHILE */
whileinit = luaK_getlabel(fs);
condexit = cond(ls);
enterblock(fs, &bl, 1);
checknext(ls, TK_DO);
block(ls);
luaK_jumpto(fs, whileinit);
check_match(ls, TK_END, TK_WHILE, line);
leaveblock(fs);
luaK_patchtohere(fs, condexit); /* false conditions finish the loop */
}
static void repeatstat (LexState *ls, int line) {
/* repeatstat -> REPEAT block UNTIL cond */
int condexit;
FuncState *fs = ls->fs;
int repeat_init = luaK_getlabel(fs);
BlockCnt bl1, bl2;
enterblock(fs, &bl1, 1); /* loop block */
enterblock(fs, &bl2, 0); /* scope block */
luaX_next(ls); /* skip REPEAT */
statlist(ls);
check_match(ls, TK_UNTIL, TK_REPEAT, line);
condexit = cond(ls); /* read condition (inside scope block) */
leaveblock(fs); /* finish scope */
if (bl2.upval) { /* upvalues? */
int exit = luaK_jump(fs); /* normal exit must jump over fix */
luaK_patchtohere(fs, condexit); /* repetition must close upvalues */
luaK_codeABC(fs, OP_CLOSE, stacklevel(fs, bl2.nactvar), 0, 0);
condexit = luaK_jump(fs); /* repeat after closing upvalues */
luaK_patchtohere(fs, exit); /* normal exit comes to here */
}
luaK_patchlist(fs, condexit, repeat_init); /* close the loop */
leaveblock(fs); /* finish loop */
}
/*
** Read an expression and generate code to put its results in next
** stack slot.
**
*/
static void exp1 (LexState *ls) {
expdesc e;
expr(ls, &e);
luaK_exp2nextreg(ls->fs, &e);
lua_assert(e.k == VNONRELOC);
}
/*
** Fix for instruction at position 'pc' to jump to 'dest'.
** (Jump addresses are relative in Lua). 'back' true means
** a back jump.
*/
static void fixforjump (FuncState *fs, int pc, int dest, int back) {
Instruction *jmp = &fs->f->code[pc];
int offset = dest - (pc + 1);
if (back)
offset = -offset;
if (unlikely(offset > MAXARG_Bx))
luaX_syntaxerror(fs->ls, "control structure too long");
SETARG_Bx(*jmp, offset);
}
/*
** Generate code for a 'for' loop.
*/
static void forbody (LexState *ls, int base, int line, int nvars, int isgen) {
/* forbody -> DO block */
static const OpCode forprep[2] = {OP_FORPREP, OP_TFORPREP};
static const OpCode forloop[2] = {OP_FORLOOP, OP_TFORLOOP};
BlockCnt bl;
FuncState *fs = ls->fs;
int prep, endfor;
checknext(ls, TK_DO);
prep = luaK_codeABx(fs, forprep[isgen], base, 0);
enterblock(fs, &bl, 0); /* scope for declared variables */
adjustlocalvars(ls, nvars);
luaK_reserveregs(fs, nvars);
block(ls);
leaveblock(fs); /* end of scope for declared variables */
fixforjump(fs, prep, luaK_getlabel(fs), 0);
if (isgen) { /* generic for? */
luaK_codeABC(fs, OP_TFORCALL, base, 0, nvars);
luaK_fixline(fs, line);
}
endfor = luaK_codeABx(fs, forloop[isgen], base, 0);
fixforjump(fs, endfor, prep + 1, 1);
luaK_fixline(fs, line);
}
static void fornum (LexState *ls, TString *varname, int line) {
/* fornum -> NAME = exp,exp[,exp] forbody */
FuncState *fs = ls->fs;
int base = fs->freereg;
new_localvarliteral(ls, "(for state)");
new_localvarliteral(ls, "(for state)");
new_localvarliteral(ls, "(for state)");
new_localvar(ls, varname);
checknext(ls, '=');
exp1(ls); /* initial value */
checknext(ls, ',');
exp1(ls); /* limit */
if (testnext(ls, ','))
exp1(ls); /* optional step */
else { /* default step = 1 */
luaK_int(fs, fs->freereg, 1);
luaK_reserveregs(fs, 1);
}
adjustlocalvars(ls, 3); /* control variables */
forbody(ls, base, line, 1, 0);
}
static void forlist (LexState *ls, TString *indexname) {
/* forlist -> NAME {,NAME} IN explist forbody */
FuncState *fs = ls->fs;
expdesc e;
int nvars = 5; /* gen, state, control, toclose, 'indexname' */
int line;
int base = fs->freereg;
/* create control variables */
new_localvarliteral(ls, "(for state)");
new_localvarliteral(ls, "(for state)");
new_localvarliteral(ls, "(for state)");
new_localvarliteral(ls, "(for state)");
/* create declared variables */
new_localvar(ls, indexname);
while (testnext(ls, ',')) {
new_localvar(ls, str_checkname(ls));
nvars++;
}
checknext(ls, TK_IN);
line = ls->linenumber;
adjust_assign(ls, 4, explist(ls, &e), &e);
adjustlocalvars(ls, 4); /* control variables */
markupval(fs, fs->nactvar); /* last control var. must be closed */
luaK_checkstack(fs, 3); /* extra space to call generator */
forbody(ls, base, line, nvars - 4, 1);
}
static void forstat (LexState *ls, int line) {
/* forstat -> FOR (fornum | forlist) END */
FuncState *fs = ls->fs;
TString *varname;
BlockCnt bl;
enterblock(fs, &bl, 1); /* scope for loop and control variables */
luaX_next(ls); /* skip 'for' */
varname = str_checkname(ls); /* first variable name */
switch (ls->t.token) {
case '=': fornum(ls, varname, line); break;
case ',': case TK_IN: forlist(ls, varname); break;
default: luaX_syntaxerror(ls, "'=' or 'in' expected");
}
check_match(ls, TK_END, TK_FOR, line);
leaveblock(fs); /* loop scope ('break' jumps to this point) */
}
/*
** Check whether next instruction is a single jump (a 'break', a 'goto'
** to a forward label, or a 'goto' to a backward label with no variable
** to close). If so, set the name of the 'label' it is jumping to
** ("break" for a 'break') or to where it is jumping to ('target') and
** return true. If not a single jump, leave input unchanged, to be
** handled as a regular statement.
*/
static int issinglejump (LexState *ls, TString **label, int *target) {
if (testnext(ls, TK_BREAK)) { /* a break? */
*label = luaS_newliteral(ls->L, "break");
return 1;
}
else if (ls->t.token != TK_GOTO || luaX_lookahead(ls) != TK_NAME)
return 0; /* not a valid goto */
else {
TString *lname = ls->lookahead.seminfo.ts; /* label's id */
Labeldesc *lb = findlabel(ls, lname);
if (lb) { /* a backward jump? */
/* does it need to close variables? */
if (luaY_nvarstack(ls->fs) > stacklevel(ls->fs, lb->nactvar))
return 0; /* not a single jump; cannot optimize */
*target = lb->pc;
}
else /* jump forward */
*label = lname;
luaX_next(ls); /* skip goto */
luaX_next(ls); /* skip name */
return 1;
}
}
static void test_then_block (LexState *ls, int *escapelist) {
/* test_then_block -> [IF | ELSEIF] cond THEN block */
BlockCnt bl;
int line;
FuncState *fs = ls->fs;
TString *jlb = NULL;
int target = NO_JUMP;
expdesc v;
int jf; /* instruction to skip 'then' code (if condition is false) */
luaX_next(ls); /* skip IF or ELSEIF */
expr(ls, &v); /* read condition */
checknext(ls, TK_THEN);
line = ls->linenumber;
if (issinglejump(ls, &jlb, &target)) { /* 'if x then goto' ? */
luaK_goiffalse(ls->fs, &v); /* will jump to label if condition is true */
enterblock(fs, &bl, 0); /* must enter block before 'goto' */
if (jlb != NULL) /* forward jump? */
newgotoentry(ls, jlb, line, v.t); /* will be resolved later */
else /* backward jump */
luaK_patchlist(fs, v.t, target); /* jump directly to 'target' */
while (testnext(ls, ';')) {} /* skip semicolons */
if (block_follow(ls, 0)) { /* jump is the entire block? */
leaveblock(fs);
return; /* and that is it */
}
else /* must skip over 'then' part if condition is false */
jf = luaK_jump(fs);
}
else { /* regular case (not a jump) */
luaK_goiftrue(ls->fs, &v); /* skip over block if condition is false */
enterblock(fs, &bl, 0);
jf = v.f;
}
statlist(ls); /* 'then' part */
leaveblock(fs);
if (ls->t.token == TK_ELSE ||
ls->t.token == TK_ELSEIF) /* followed by 'else'/'elseif'? */
luaK_concat(fs, escapelist, luaK_jump(fs)); /* must jump over it */
luaK_patchtohere(fs, jf);
}
static void ifstat (LexState *ls, int line) {
/* ifstat -> IF cond THEN block {ELSEIF cond THEN block} [ELSE block] END */
FuncState *fs = ls->fs;
int escapelist = NO_JUMP; /* exit list for finished parts */
test_then_block(ls, &escapelist); /* IF cond THEN block */
while (ls->t.token == TK_ELSEIF)
test_then_block(ls, &escapelist); /* ELSEIF cond THEN block */
if (testnext(ls, TK_ELSE))
block(ls); /* 'else' part */
check_match(ls, TK_END, TK_IF, line);
luaK_patchtohere(fs, escapelist); /* patch escape list to 'if' end */
}
static void localfunc (LexState *ls) {
expdesc b;
FuncState *fs = ls->fs;
int fvar = fs->nactvar; /* function's variable index */
new_localvar(ls, str_checkname(ls)); /* new local variable */
adjustlocalvars(ls, 1); /* enter its scope */
body(ls, &b, 0, ls->linenumber); /* function created in next register */
/* debug information will only see the variable after this point! */
localdebuginfo(fs, fvar)->startpc = fs->pc;
}
static int getlocalattribute (LexState *ls) {
/* ATTRIB -> ['<' Name '>'] */
if (testnext(ls, '<')) {
const char *attr = getstr(str_checkname(ls));
checknext(ls, '>');
if (strcmp(attr, "const") == 0)
return RDKCONST; /* read-only variable */
else if (strcmp(attr, "close") == 0)
return RDKTOCLOSE; /* to-be-closed variable */
else
luaK_semerror(ls,
luaO_pushfstring(ls->L, "unknown attribute '%s'", attr));
}
return VDKREG; /* regular variable */
}
static void checktoclose (LexState *ls, int level) {
if (level != -1) { /* is there a to-be-closed variable? */
FuncState *fs = ls->fs;
markupval(fs, level + 1);
fs->bl->insidetbc = 1; /* in the scope of a to-be-closed variable */
luaK_codeABC(fs, OP_TBC, stacklevel(fs, level), 0, 0);
}
}
static void localstat (LexState *ls) {
/* stat -> LOCAL ATTRIB NAME {',' ATTRIB NAME} ['=' explist] */
FuncState *fs = ls->fs;
int toclose = -1; /* index of to-be-closed variable (if any) */
Vardesc *var; /* last variable */
int vidx, kind; /* index and kind of last variable */
int nvars = 0;
int nexps;
expdesc e;
do {
vidx = new_localvar(ls, str_checkname(ls));
kind = getlocalattribute(ls);
getlocalvardesc(fs, vidx)->vd.kind = kind;
if (kind == RDKTOCLOSE) { /* to-be-closed? */
if (toclose != -1) /* one already present? */
luaK_semerror(ls, "multiple to-be-closed variables in local list");
toclose = fs->nactvar + nvars;
}
nvars++;
} while (testnext(ls, ','));
if (testnext(ls, '='))
nexps = explist(ls, &e);
else {
e.k = VVOID;
nexps = 0;
}
var = getlocalvardesc(fs, vidx); /* get last variable */
if (nvars == nexps && /* no adjustments? */
var->vd.kind == RDKCONST && /* last variable is const? */
luaK_exp2const(fs, &e, &var->k)) { /* compile-time constant? */
var->vd.kind = RDKCTC; /* variable is a compile-time constant */
adjustlocalvars(ls, nvars - 1); /* exclude last variable */
fs->nactvar++; /* but count it */
}
else {
adjust_assign(ls, nvars, nexps, &e);
adjustlocalvars(ls, nvars);
}
checktoclose(ls, toclose);
}
static int funcname (LexState *ls, expdesc *v) {
/* funcname -> NAME {fieldsel} [':' NAME] */
int ismethod = 0;
singlevar(ls, v);
while (ls->t.token == '.')
fieldsel(ls, v);
if (ls->t.token == ':') {
ismethod = 1;
fieldsel(ls, v);
}
return ismethod;
}
static void funcstat (LexState *ls, int line) {
/* funcstat -> FUNCTION funcname body */
int ismethod;
expdesc v, b;
luaX_next(ls); /* skip FUNCTION */
ismethod = funcname(ls, &v);
body(ls, &b, ismethod, line);
luaK_storevar(ls->fs, &v, &b);
luaK_fixline(ls->fs, line); /* definition "happens" in the first line */
}
static void exprstat (LexState *ls) {
/* stat -> func | assignment */
FuncState *fs = ls->fs;
struct LHS_assign v;
suffixedexp(ls, &v.v);
if (ls->t.token == '=' || ls->t.token == ',') { /* stat -> assignment ? */
v.prev = NULL;
restassign(ls, &v, 1);
}
else { /* stat -> func */
Instruction *inst;
check_condition(ls, v.v.k == VCALL, "syntax error");
inst = &getinstruction(fs, &v.v);
SETARG_C(*inst, 1); /* call statement uses no results */
}
}
static void retstat (LexState *ls) {
/* stat -> RETURN [explist] [';'] */
FuncState *fs = ls->fs;
expdesc e;
int nret; /* number of values being returned */
int first = luaY_nvarstack(fs); /* first slot to be returned */
if (block_follow(ls, 1) || ls->t.token == ';')
nret = 0; /* return no values */
else {
nret = explist(ls, &e); /* optional return values */
if (hasmultret(e.k)) {
luaK_setmultret(fs, &e);
if (e.k == VCALL && nret == 1 && !fs->bl->insidetbc) { /* tail call? */
SET_OPCODE(getinstruction(fs,&e), OP_TAILCALL);
lua_assert(GETARG_A(getinstruction(fs,&e)) == luaY_nvarstack(fs));
}
nret = LUA_MULTRET; /* return all values */
}
else {
if (nret == 1) /* only one single value? */
first = luaK_exp2anyreg(fs, &e); /* can use original slot */
else { /* values must go to the top of the stack */
luaK_exp2nextreg(fs, &e);
lua_assert(nret == fs->freereg - first);
}
}
}
luaK_ret(fs, first, nret);
testnext(ls, ';'); /* skip optional semicolon */
}
static void statement (LexState *ls) {
int line = ls->linenumber; /* may be needed for error messages */
enterlevel(ls);
switch (ls->t.token) {
case ';': { /* stat -> ';' (empty statement) */
luaX_next(ls); /* skip ';' */
break;
}
case TK_IF: { /* stat -> ifstat */
ifstat(ls, line);
break;
}
case TK_WHILE: { /* stat -> whilestat */
whilestat(ls, line);
break;
}
case TK_DO: { /* stat -> DO block END */
luaX_next(ls); /* skip DO */
block(ls);
check_match(ls, TK_END, TK_DO, line);
break;
}
case TK_FOR: { /* stat -> forstat */
forstat(ls, line);
break;
}
case TK_REPEAT: { /* stat -> repeatstat */
repeatstat(ls, line);
break;
}
case TK_FUNCTION: { /* stat -> funcstat */
funcstat(ls, line);
break;
}
case TK_LOCAL: { /* stat -> localstat */
luaX_next(ls); /* skip LOCAL */
if (testnext(ls, TK_FUNCTION)) /* local function? */
localfunc(ls);
else
localstat(ls);
break;
}
case TK_DBCOLON: { /* stat -> label */
luaX_next(ls); /* skip double colon */
labelstat(ls, str_checkname(ls), line);
break;
}
case TK_RETURN: { /* stat -> retstat */
luaX_next(ls); /* skip RETURN */
retstat(ls);
break;
}
case TK_BREAK: { /* stat -> breakstat */
breakstat(ls);
break;
}
case TK_GOTO: { /* stat -> 'goto' NAME */
luaX_next(ls); /* skip 'goto' */
gotostat(ls);
break;
}
default: { /* stat -> func | assignment */
exprstat(ls);
break;
}
}
lua_assert(ls->fs->f->maxstacksize >= ls->fs->freereg &&
ls->fs->freereg >= luaY_nvarstack(ls->fs));
ls->fs->freereg = luaY_nvarstack(ls->fs); /* free registers */
leavelevel(ls);
}
/* }====================================================================== */
/*
** compiles the main function, which is a regular vararg function with an
** upvalue named LUA_ENV
*/
static void mainfunc (LexState *ls, FuncState *fs) {
BlockCnt bl;
Upvaldesc *env;
open_func(ls, fs, &bl);
setvararg(fs, 0); /* main function is always declared vararg */
env = allocupvalue(fs); /* ...set environment upvalue */
env->instack = 1;
env->idx = 0;
env->kind = VDKREG;
env->name = ls->envn;
luaC_objbarrier(ls->L, fs->f, env->name);
luaX_next(ls); /* read first token */
statlist(ls); /* parse main body */
check(ls, TK_EOS);
close_func(ls);
}
LClosure *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff,
Dyndata *dyd, const char *name, int firstchar) {
LexState lexstate;
FuncState funcstate;
LClosure *cl = luaF_newLclosure(L, 1); /* create main closure */
setclLvalue2s(L, L->top, cl); /* anchor it (to avoid being collected) */
luaD_inctop(L);
lexstate.h = luaH_new(L); /* create table for scanner */
sethvalue2s(L, L->top, lexstate.h); /* anchor it */
luaD_inctop(L);
funcstate.f = cl->p = luaF_newproto(L);
luaC_objbarrier(L, cl, cl->p);
funcstate.f->source = luaS_new(L, name); /* create and anchor TString */
luaC_objbarrier(L, funcstate.f, funcstate.f->source);
lexstate.buff = buff;
lexstate.dyd = dyd;
dyd->actvar.n = dyd->gt.n = dyd->label.n = 0;
luaX_setinput(L, &lexstate, z, funcstate.f->source, firstchar);
mainfunc(&lexstate, &funcstate);
lua_assert(!funcstate.prev && funcstate.nups == 1 && !lexstate.fs);
/* all scopes should be correctly finished */
lua_assert(dyd->actvar.n == 0 && dyd->gt.n == 0 && dyd->label.n == 0);
L->top--; /* remove scanner's table */
return cl; /* closure is on the stack, too */
}
LPREFIX¶
/*
** $Id: lprefix.h $
** Definitions for Lua code that must come before any other header file
** See Copyright Notice in lua.h
*/
#ifndef lprefix_h
#define lprefix_h
#include "_native_lua_config.h" /* native Lua */
/*
** Allows POSIX/XSI stuff
*/
#if !defined(LUA_USE_C89) /* { */
#if !defined(_XOPEN_SOURCE)
#define _XOPEN_SOURCE 600
#elif _XOPEN_SOURCE == 0
#undef _XOPEN_SOURCE /* use -D_XOPEN_SOURCE=0 to undefine it */
#endif
/*
** Allows manipulation of large files in gcc and some other compilers
*/
#if !defined(LUA_32BITS) && !defined(_FILE_OFFSET_BITS)
#define _LARGEFILE_SOURCE 1
#define _FILE_OFFSET_BITS 64
#endif
#endif /* } */
/*
** Windows stuff
*/
#if defined(_WIN32) /* { */
#if !defined(_CRT_SECURE_NO_WARNINGS)
#define _CRT_SECURE_NO_WARNINGS /* avoid warnings about ISO C functions */
#endif
#endif /* } */
#endif
LSTATE¶
/*
** $Id: lstate.h $
** Global State
** See Copyright Notice in lua.h
*/
#ifndef lstate_h
#define lstate_h
#include "lua.h"
#include "lobject.h"
#include "ltm.h"
#include "lzio.h"
#include "_native_lua_config.h" /* native Lua */
/*
** Some notes about garbage-collected objects: All objects in Lua must
** be kept somehow accessible until being freed, so all objects always
** belong to one (and only one) of these lists, using field 'next' of
** the 'CommonHeader' for the link:
**
** 'allgc': all objects not marked for finalization;
** 'finobj': all objects marked for finalization;
** 'tobefnz': all objects ready to be finalized;
** 'fixedgc': all objects that are not to be collected (currently
** only small strings, such as reserved words).
**
** For the generational collector, some of these lists have marks for
** generations. Each mark points to the first element in the list for
** that particular generation; that generation goes until the next mark.
**
** 'allgc' -> 'survival': new objects;
** 'survival' -> 'old': objects that survived one collection;
** 'old' -> 'reallyold': objects that became old in last collection;
** 'reallyold' -> NULL: objects old for more than one cycle.
**
** 'finobj' -> 'finobjsur': new objects marked for finalization;
** 'finobjsur' -> 'finobjold': survived """";
** 'finobjold' -> 'finobjrold': just old """";
** 'finobjrold' -> NULL: really old """".
*/
/*
** Moreover, there is another set of lists that control gray objects.
** These lists are linked by fields 'gclist'. (All objects that
** can become gray have such a field. The field is not the same
** in all objects, but it always has this name.) Any gray object
** must belong to one of these lists, and all objects in these lists
** must be gray:
**
** 'gray': regular gray objects, still waiting to be visited.
** 'grayagain': objects that must be revisited at the atomic phase.
** That includes
** - black objects got in a write barrier;
** - all kinds of weak tables during propagation phase;
** - all threads.
** 'weak': tables with weak values to be cleared;
** 'ephemeron': ephemeron tables with white->white entries;
** 'allweak': tables with weak keys and/or weak values to be cleared.
*/
/*
** About 'nCcalls': each thread in Lua (a lua_State) keeps a count of
** how many "C calls" it still can do in the C stack, to avoid C-stack
** overflow. This count is very rough approximation; it considers only
** recursive functions inside the interpreter, as non-recursive calls
** can be considered using a fixed (although unknown) amount of stack
** space.
**
** The count has two parts: the lower part is the count itself; the
** higher part counts the number of non-yieldable calls in the stack.
** (They are together so that we can change both with one instruction.)
**
** Because calls to external C functions can use an unknown amount
** of space (e.g., functions using an auxiliary buffer), calls
** to these functions add more than one to the count (see CSTACKCF).
**
** The proper count excludes the number of CallInfo structures allocated
** by Lua, as a kind of "potential" calls. So, when Lua calls a function
** (and "consumes" one CallInfo), it needs neither to decrement nor to
** check 'nCcalls', as its use of C stack is already accounted for.
*/
/* number of "C stack slots" used by an external C function */
#define CSTACKCF 10
/*
** The C-stack size is sliced in the following zones:
** - larger than CSTACKERR: normal stack;
** - [CSTACKMARK, CSTACKERR]: buffer zone to signal a stack overflow;
** - [CSTACKCF, CSTACKERRMARK]: error-handling zone;
** - below CSTACKERRMARK: buffer zone to signal overflow during overflow;
** (Because the counter can be decremented CSTACKCF at once, we need
** the so called "buffer zones", with at least that size, to properly
** detect a change from one zone to the next.)
*/
#define CSTACKERR (8 * CSTACKCF)
#define CSTACKMARK (CSTACKERR - (CSTACKCF + 2))
#define CSTACKERRMARK (CSTACKCF + 2)
/* initial limit for the C-stack of threads */
#define CSTACKTHREAD (2 * CSTACKERR)
/* true if this thread does not have non-yieldable calls in the stack */
#define yieldable(L) (((L)->nCcalls & 0xffff0000) == 0)
/* real number of C calls */
#define getCcalls(L) ((L)->nCcalls & 0xffff)
/* Increment the number of non-yieldable calls */
#define incnny(L) ((L)->nCcalls += 0x10000)
/* Decrement the number of non-yieldable calls */
#define decnny(L) ((L)->nCcalls -= 0x10000)
/* Increment the number of non-yieldable calls and decrement nCcalls */
#define incXCcalls(L) ((L)->nCcalls += 0x10000 - CSTACKCF)
/* Decrement the number of non-yieldable calls and increment nCcalls */
#define decXCcalls(L) ((L)->nCcalls -= 0x10000 - CSTACKCF)
struct lua_longjmp; /* defined in ldo.c */
/*
** Atomic type (relative to signals) to better ensure that 'lua_sethook'
** is thread safe
*/
#if !defined(l_signalT)
#include <signal.h>
#define l_signalT sig_atomic_t
#endif
/* extra stack space to handle TM calls and some other extras */
#define EXTRA_STACK 5
#define BASIC_STACK_SIZE (2*LUA_MINSTACK)
/* kinds of Garbage Collection */
#define KGC_INC 0 /* incremental gc */
#define KGC_GEN 1 /* generational gc */
typedef struct stringtable {
TString **hash;
int nuse; /* number of elements */
int size;
} stringtable;
/*
** Information about a call.
*/
typedef struct CallInfo {
StkId func; /* function index in the stack */
StkId top; /* top for this function */
struct CallInfo *previous, *next; /* dynamic call link */
union {
struct { /* only for Lua functions */
const Instruction *savedpc;
volatile l_signalT trap;
int nextraargs; /* # of extra arguments in vararg functions */
} l;
struct { /* only for C functions */
lua_KFunction k; /* continuation in case of yields */
ptrdiff_t old_errfunc;
lua_KContext ctx; /* context info. in case of yields */
} c;
} u;
union {
int funcidx; /* called-function index */
int nyield; /* number of values yielded */
struct { /* info about transferred values (for call/return hooks) */
unsigned short ftransfer; /* offset of first value transferred */
unsigned short ntransfer; /* number of values transferred */
} transferinfo;
} u2;
short nresults; /* expected number of results from this function */
unsigned short callstatus;
} CallInfo;
/*
** Bits in CallInfo status
*/
#define CIST_OAH (1<<0) /* original value of 'allowhook' */
#define CIST_C (1<<1) /* call is running a C function */
#define CIST_HOOKED (1<<2) /* call is running a debug hook */
#define CIST_YPCALL (1<<3) /* call is a yieldable protected call */
#define CIST_TAIL (1<<4) /* call was tail called */
#define CIST_HOOKYIELD (1<<5) /* last hook called yielded */
#define CIST_FIN (1<<6) /* call is running a finalizer */
#define CIST_TRAN (1<<7) /* 'ci' has transfer information */
#if defined(LUA_COMPAT_LT_LE)
#define CIST_LEQ (1<<8) /* using __lt for __le */
#endif
/* active function is a Lua function */
#define isLua(ci) (!((ci)->callstatus & CIST_C))
/* call is running Lua code (not a hook) */
#define isLuacode(ci) (!((ci)->callstatus & (CIST_C | CIST_HOOKED)))
/* assume that CIST_OAH has offset 0 and that 'v' is strictly 0/1 */
#define setoah(st,v) ((st) = ((st) & ~CIST_OAH) | (v))
#define getoah(st) ((st) & CIST_OAH)
/*
** 'global state', shared by all threads of this state
*/
typedef struct global_State {
lua_Alloc frealloc; /* function to reallocate memory */
void *ud; /* auxiliary data to 'frealloc' */
l_mem totalbytes; /* number of bytes currently allocated - GCdebt */
l_mem GCdebt; /* bytes allocated not yet compensated by the collector */
lu_mem GCestimate; /* an estimate of the non-garbage memory in use */
lu_mem lastatomic; /* see function 'genstep' in file 'lgc.c' */
stringtable strt; /* hash table for strings */
TValue l_registry;
TValue nilvalue; /* a nil value */
unsigned int seed; /* randomized seed for hashes */
lu_byte currentwhite;
lu_byte gcstate; /* state of garbage collector */
lu_byte gckind; /* kind of GC running */
lu_byte genminormul; /* control for minor generational collections */
lu_byte genmajormul; /* control for major generational collections */
lu_byte gcrunning; /* true if GC is running */
lu_byte gcemergency; /* true if this is an emergency collection */
lu_byte gcpause; /* size of pause between successive GCs */
lu_byte gcstepmul; /* GC "speed" */
lu_byte gcstepsize; /* (log2 of) GC granularity */
GCObject *allgc; /* list of all collectable objects */
GCObject **sweepgc; /* current position of sweep in list */
GCObject *finobj; /* list of collectable objects with finalizers */
GCObject *gray; /* list of gray objects */
GCObject *grayagain; /* list of objects to be traversed atomically */
GCObject *weak; /* list of tables with weak values */
GCObject *ephemeron; /* list of ephemeron tables (weak keys) */
GCObject *allweak; /* list of all-weak tables */
GCObject *tobefnz; /* list of userdata to be GC */
GCObject *fixedgc; /* list of objects not to be collected */
/* fields for generational collector */
GCObject *survival; /* start of objects that survived one GC cycle */
GCObject *old; /* start of old objects */
GCObject *reallyold; /* old objects with more than one cycle */
GCObject *finobjsur; /* list of survival objects with finalizers */
GCObject *finobjold; /* list of old objects with finalizers */
GCObject *finobjrold; /* list of really old objects with finalizers */
struct lua_State *twups; /* list of threads with open upvalues */
lua_CFunction panic; /* to be called in unprotected errors */
struct lua_State *mainthread;
TString *memerrmsg; /* message for memory-allocation errors */
TString *tmname[TM_N]; /* array with tag-method names */
struct Table *mt[LUA_NUMTAGS]; /* metatables for basic types */
TString *strcache[STRCACHE_N][STRCACHE_M]; /* cache for strings in API */
lua_WarnFunction warnf; /* warning function */
void *ud_warn; /* auxiliary data to 'warnf' */
unsigned int Cstacklimit; /* current limit for the C stack */
} global_State;
/*
** 'per thread' state
*/
struct lua_State {
CommonHeader;
lu_byte status;
lu_byte allowhook;
unsigned short nci; /* number of items in 'ci' list */
StkId top; /* first free slot in the stack */
global_State *l_G;
CallInfo *ci; /* call info for current function */
const Instruction *oldpc; /* last pc traced */
StkId stack_last; /* last free slot in the stack */
StkId stack; /* stack base */
UpVal *openupval; /* list of open upvalues in this stack */
GCObject *gclist;
struct lua_State *twups; /* list of threads with open upvalues */
struct lua_longjmp *errorJmp; /* current error recover point */
CallInfo base_ci; /* CallInfo for first level (C calling Lua) */
volatile lua_Hook hook;
ptrdiff_t errfunc; /* current error handling function (stack index) */
l_uint32 nCcalls; /* number of allowed nested C calls - 'nci' */
int stacksize;
int basehookcount;
int hookcount;
volatile l_signalT hookmask;
};
#define G(L) (L->l_G)
/*
** Union of all collectable objects (only for conversions)
*/
union GCUnion {
GCObject gc; /* common header */
struct TString ts;
struct Udata u;
union Closure cl;
struct Table h;
struct Proto p;
struct lua_State th; /* thread */
struct UpVal upv;
};
#define cast_u(o) cast(union GCUnion *, (o))
/* macros to convert a GCObject into a specific value */
#define gco2ts(o) \
check_exp(novariant((o)->tt) == LUA_TSTRING, &((cast_u(o))->ts))
#define gco2u(o) check_exp((o)->tt == LUA_VUSERDATA, &((cast_u(o))->u))
#define gco2lcl(o) check_exp((o)->tt == LUA_VLCL, &((cast_u(o))->cl.l))
#define gco2ccl(o) check_exp((o)->tt == LUA_VCCL, &((cast_u(o))->cl.c))
#define gco2cl(o) \
check_exp(novariant((o)->tt) == LUA_TFUNCTION, &((cast_u(o))->cl))
#define gco2t(o) check_exp((o)->tt == LUA_VTABLE, &((cast_u(o))->h))
#define gco2p(o) check_exp((o)->tt == LUA_VPROTO, &((cast_u(o))->p))
#define gco2th(o) check_exp((o)->tt == LUA_VTHREAD, &((cast_u(o))->th))
#define gco2upv(o) check_exp((o)->tt == LUA_VUPVAL, &((cast_u(o))->upv))
/*
** macro to convert a Lua object into a GCObject
** (The access to 'tt' tries to ensure that 'v' is actually a Lua object.)
*/
#define obj2gco(v) check_exp((v)->tt >= LUA_TSTRING, &(cast_u(v)->gc))
/* actual number of total bytes allocated */
#define gettotalbytes(g) cast(lu_mem, (g)->totalbytes + (g)->GCdebt)
LUAI_FUNC void luaE_setdebt (global_State *g, l_mem debt);
LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1);
LUAI_FUNC CallInfo *luaE_extendCI (lua_State *L);
LUAI_FUNC void luaE_freeCI (lua_State *L);
LUAI_FUNC void luaE_shrinkCI (lua_State *L);
LUAI_FUNC void luaE_enterCcall (lua_State *L);
LUAI_FUNC void luaE_warning (lua_State *L, const char *msg, int tocont);
LUAI_FUNC void luaE_warnerror (lua_State *L, const char *where);
#define luaE_exitCcall(L) ((L)->nCcalls++)
#endif
/*
** $Id: lstate.c $
** Global State
** See Copyright Notice in lua.h
*/
#define lstate_c
#define LUA_CORE
#include "lprefix.h"
#include <stddef.h>
#include <string.h>
#include "lua.h"
#include "lapi.h"
#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "lgc.h"
#include "llex.h"
#include "lmem.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "ltm.h"
/*
** thread state + extra space
*/
typedef struct LX {
lu_byte extra_[LUA_EXTRASPACE];
lua_State l;
} LX;
/*
** Main thread combines a thread state and the global state
*/
typedef struct LG {
LX l;
global_State g;
} LG;
#define fromstate(L) (cast(LX *, cast(lu_byte *, (L)) - offsetof(LX, l)))
/*
** A macro to create a "random" seed when a state is created;
** the seed is used to randomize string hashes.
*/
#if !defined(luai_makeseed)
#include <time.h>
/*
** Compute an initial seed with some level of randomness.
** Rely on Address Space Layout Randomization (if present) and
** current time.
*/
#define addbuff(b,p,e) \
{ size_t t = cast_sizet(e); \
memcpy(b + p, &t, sizeof(t)); p += sizeof(t); }
static unsigned int luai_makeseed (lua_State *L) {
char buff[3 * sizeof(size_t)];
unsigned int h = cast_uint(time(NULL));
int p = 0;
addbuff(buff, p, L); /* heap variable */
addbuff(buff, p, &h); /* local variable */
addbuff(buff, p, &lua_newstate); /* public function */
lua_assert(p == sizeof(buff));
return luaS_hash(buff, p, h, 1);
}
#endif
/*
** set GCdebt to a new value keeping the value (totalbytes + GCdebt)
** invariant (and avoiding underflows in 'totalbytes')
*/
void luaE_setdebt (global_State *g, l_mem debt) {
l_mem tb = gettotalbytes(g);
lua_assert(tb > 0);
if (debt < tb - MAX_LMEM)
debt = tb - MAX_LMEM; /* will make 'totalbytes == MAX_LMEM' */
g->totalbytes = tb - debt;
g->GCdebt = debt;
}
LUA_API int lua_setcstacklimit (lua_State *L, unsigned int limit) {
global_State *g = G(L);
int ccalls;
luaE_freeCI(L); /* release unused CIs */
ccalls = getCcalls(L);
if (limit >= 40000)
return 0; /* out of bounds */
limit += CSTACKERR;
if (L != g-> mainthread)
return 0; /* only main thread can change the C stack */
else if (ccalls <= CSTACKERR)
return 0; /* handling overflow */
else {
int diff = limit - g->Cstacklimit;
if (ccalls + diff <= CSTACKERR)
return 0; /* new limit would cause an overflow */
g->Cstacklimit = limit; /* set new limit */
L->nCcalls += diff; /* correct 'nCcalls' */
return limit - diff - CSTACKERR; /* success; return previous limit */
}
}
/*
** Decrement count of "C calls" and check for overflows. In case of
** a stack overflow, check appropriate error ("regular" overflow or
** overflow while handling stack overflow). If 'nCcalls' is smaller
** than CSTACKERR but larger than CSTACKMARK, it means it has just
** entered the "overflow zone", so the function raises an overflow
** error. If 'nCcalls' is smaller than CSTACKMARK (which means it is
** already handling an overflow) but larger than CSTACKERRMARK, does
** not report an error (to allow message handling to work). Otherwise,
** report a stack overflow while handling a stack overflow (probably
** caused by a repeating error in the message handling function).
*/
void luaE_enterCcall (lua_State *L) {
int ncalls = getCcalls(L);
L->nCcalls--;
if (ncalls <= CSTACKERR) { /* possible overflow? */
luaE_freeCI(L); /* release unused CIs */
ncalls = getCcalls(L); /* update call count */
if (ncalls <= CSTACKERR) { /* still overflow? */
if (ncalls <= CSTACKERRMARK) /* below error-handling zone? */
luaD_throw(L, LUA_ERRERR); /* error while handling stack error */
else if (ncalls >= CSTACKMARK) {
/* not in error-handling zone; raise the error now */
L->nCcalls = (CSTACKMARK - 1); /* enter error-handling zone */
luaG_runerror(L, "C stack overflow");
}
/* else stack is in the error-handling zone;
allow message handler to work */
}
}
}
CallInfo *luaE_extendCI (lua_State *L) {
CallInfo *ci;
lua_assert(L->ci->next == NULL);
luaE_enterCcall(L);
ci = luaM_new(L, CallInfo);
lua_assert(L->ci->next == NULL);
L->ci->next = ci;
ci->previous = L->ci;
ci->next = NULL;
ci->u.l.trap = 0;
L->nci++;
return ci;
}
/*
** free all CallInfo structures not in use by a thread
*/
void luaE_freeCI (lua_State *L) {
CallInfo *ci = L->ci;
CallInfo *next = ci->next;
ci->next = NULL;
L->nCcalls += L->nci; /* add removed elements back to 'nCcalls' */
while ((ci = next) != NULL) {
next = ci->next;
luaM_free(L, ci);
L->nci--;
}
L->nCcalls -= L->nci; /* adjust result */
}
/*
** free half of the CallInfo structures not in use by a thread,
** keeping the first one.
*/
void luaE_shrinkCI (lua_State *L) {
CallInfo *ci = L->ci->next; /* first free CallInfo */
CallInfo *next;
if (ci == NULL)
return; /* no extra elements */
L->nCcalls += L->nci; /* add removed elements back to 'nCcalls' */
while ((next = ci->next) != NULL) { /* two extra elements? */
CallInfo *next2 = next->next; /* next's next */
ci->next = next2; /* remove next from the list */
L->nci--;
luaM_free(L, next); /* free next */
if (next2 == NULL)
break; /* no more elements */
else {
next2->previous = ci;
ci = next2; /* continue */
}
}
L->nCcalls -= L->nci; /* adjust result */
}
static void stack_init (lua_State *L1, lua_State *L) {
int i; CallInfo *ci;
/* initialize stack array */
L1->stack = luaM_newvector(L, BASIC_STACK_SIZE, StackValue);
L1->stacksize = BASIC_STACK_SIZE;
for (i = 0; i < BASIC_STACK_SIZE; i++)
setnilvalue(s2v(L1->stack + i)); /* erase new stack */
L1->top = L1->stack;
L1->stack_last = L1->stack + L1->stacksize - EXTRA_STACK;
/* initialize first ci */
ci = &L1->base_ci;
ci->next = ci->previous = NULL;
ci->callstatus = CIST_C;
ci->func = L1->top;
ci->u.c.k = NULL;
ci->nresults = 0;
setnilvalue(s2v(L1->top)); /* 'function' entry for this 'ci' */
L1->top++;
ci->top = L1->top + LUA_MINSTACK;
L1->ci = ci;
}
static void freestack (lua_State *L) {
if (L->stack == NULL)
return; /* stack not completely built yet */
L->ci = &L->base_ci; /* free the entire 'ci' list */
luaE_freeCI(L);
lua_assert(L->nci == 0);
luaM_freearray(L, L->stack, L->stacksize); /* free stack array */
}
/*
** Create registry table and its predefined values
*/
static void init_registry (lua_State *L, global_State *g) {
TValue temp;
/* create registry */
Table *registry = luaH_new(L);
sethvalue(L, &g->l_registry, registry);
luaH_resize(L, registry, LUA_RIDX_LAST, 0);
/* registry[LUA_RIDX_MAINTHREAD] = L */
setthvalue(L, &temp, L); /* temp = L */
luaH_setint(L, registry, LUA_RIDX_MAINTHREAD, &temp);
/* registry[LUA_RIDX_GLOBALS] = table of globals */
sethvalue(L, &temp, luaH_new(L)); /* temp = new table (global table) */
luaH_setint(L, registry, LUA_RIDX_GLOBALS, &temp);
}
/*
** open parts of the state that may cause memory-allocation errors.
** ('g->nilvalue' being a nil value flags that the state was completely
** build.)
*/
static void f_luaopen (lua_State *L, void *ud) {
global_State *g = G(L);
UNUSED(ud);
stack_init(L, L); /* init stack */
init_registry(L, g);
luaS_init(L);
luaT_init(L);
luaX_init(L);
g->gcrunning = 1; /* allow gc */
setnilvalue(&g->nilvalue);
luai_userstateopen(L);
}
/*
** preinitialize a thread with consistent values without allocating
** any memory (to avoid errors)
*/
static void preinit_thread (lua_State *L, global_State *g) {
G(L) = g;
L->stack = NULL;
L->ci = NULL;
L->nci = 0;
L->stacksize = 0;
L->twups = L; /* thread has no upvalues */
L->errorJmp = NULL;
L->hook = NULL;
L->hookmask = 0;
L->basehookcount = 0;
L->allowhook = 1;
resethookcount(L);
L->openupval = NULL;
L->status = LUA_OK;
L->errfunc = 0;
}
static void close_state (lua_State *L) {
global_State *g = G(L);
luaF_close(L, L->stack, CLOSEPROTECT); /* close all upvalues */
luaC_freeallobjects(L); /* collect all objects */
if (ttisnil(&g->nilvalue)) /* closing a fully built state? */
luai_userstateclose(L);
luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size);
freestack(L);
lua_assert(gettotalbytes(g) == sizeof(LG));
(*g->frealloc)(g->ud, fromstate(L), sizeof(LG), 0); /* free main block */
}
LUA_API lua_State *lua_newthread (lua_State *L) {
global_State *g = G(L);
lua_State *L1;
lua_lock(L);
luaC_checkGC(L);
/* create new thread */
L1 = &cast(LX *, luaM_newobject(L, LUA_TTHREAD, sizeof(LX)))->l;
L1->marked = luaC_white(g);
L1->tt = LUA_VTHREAD;
/* link it on list 'allgc' */
L1->next = g->allgc;
g->allgc = obj2gco(L1);
/* anchor it on L stack */
setthvalue2s(L, L->top, L1);
api_incr_top(L);
preinit_thread(L1, g);
L1->nCcalls = getCcalls(L);
L1->hookmask = L->hookmask;
L1->basehookcount = L->basehookcount;
L1->hook = L->hook;
resethookcount(L1);
/* initialize L1 extra space */
memcpy(lua_getextraspace(L1), lua_getextraspace(g->mainthread),
LUA_EXTRASPACE);
luai_userstatethread(L, L1);
stack_init(L1, L); /* init stack */
lua_unlock(L);
return L1;
}
void luaE_freethread (lua_State *L, lua_State *L1) {
LX *l = fromstate(L1);
luaF_close(L1, L1->stack, NOCLOSINGMETH); /* close all upvalues */
lua_assert(L1->openupval == NULL);
luai_userstatefree(L, L1);
freestack(L1);
luaM_free(L, l);
}
int lua_resetthread (lua_State *L) {
CallInfo *ci;
int status;
lua_lock(L);
L->ci = ci = &L->base_ci; /* unwind CallInfo list */
setnilvalue(s2v(L->stack)); /* 'function' entry for basic 'ci' */
ci->func = L->stack;
ci->callstatus = CIST_C;
status = luaF_close(L, L->stack, CLOSEPROTECT);
if (status != CLOSEPROTECT) /* real errors? */
luaD_seterrorobj(L, status, L->stack + 1);
else {
status = LUA_OK;
L->top = L->stack + 1;
}
ci->top = L->top + LUA_MINSTACK;
L->status = status;
lua_unlock(L);
return status;
}
LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
int i;
lua_State *L;
global_State *g;
LG *l = cast(LG *, (*f)(ud, NULL, LUA_TTHREAD, sizeof(LG)));
if (l == NULL) return NULL;
L = &l->l.l;
g = &l->g;
L->tt = LUA_VTHREAD;
g->currentwhite = bitmask(WHITE0BIT);
L->marked = luaC_white(g);
preinit_thread(L, g);
g->allgc = obj2gco(L); /* by now, only object is the main thread */
L->next = NULL;
g->Cstacklimit = L->nCcalls = LUAI_MAXCSTACK + CSTACKERR;
g->frealloc = f;
g->ud = ud;
g->warnf = NULL;
g->ud_warn = NULL;
g->mainthread = L;
g->seed = luai_makeseed(L);
g->gcrunning = 0; /* no GC while building state */
g->strt.size = g->strt.nuse = 0;
g->strt.hash = NULL;
setnilvalue(&g->l_registry);
g->panic = NULL;
g->gcstate = GCSpause;
g->gckind = KGC_INC;
g->gcemergency = 0;
g->finobj = g->tobefnz = g->fixedgc = NULL;
g->survival = g->old = g->reallyold = NULL;
g->finobjsur = g->finobjold = g->finobjrold = NULL;
g->sweepgc = NULL;
g->gray = g->grayagain = NULL;
g->weak = g->ephemeron = g->allweak = NULL;
g->twups = NULL;
g->totalbytes = sizeof(LG);
g->GCdebt = 0;
g->lastatomic = 0;
setivalue(&g->nilvalue, 0); /* to signal that state is not yet built */
setgcparam(g->gcpause, LUAI_GCPAUSE);
setgcparam(g->gcstepmul, LUAI_GCMUL);
g->gcstepsize = LUAI_GCSTEPSIZE;
setgcparam(g->genmajormul, LUAI_GENMAJORMUL);
g->genminormul = LUAI_GENMINORMUL;
for (i=0; i < LUA_NUMTAGS; i++) g->mt[i] = NULL;
if (luaD_rawrunprotected(L, f_luaopen, NULL) != LUA_OK) {
/* memory allocation error: free partial state */
close_state(L);
L = NULL;
}
return L;
}
LUA_API void lua_close (lua_State *L) {
L = G(L)->mainthread; /* only the main thread can be closed */
lua_lock(L);
close_state(L);
}
void luaE_warning (lua_State *L, const char *msg, int tocont) {
lua_WarnFunction wf = G(L)->warnf;
if (wf != NULL)
wf(G(L)->ud_warn, msg, tocont);
}
/*
** Generate a warning from an error message
*/
void luaE_warnerror (lua_State *L, const char *where) {
TValue *errobj = s2v(L->top - 1); /* error object */
const char *msg = (ttisstring(errobj))
? svalue(errobj)
: "error object is not a string";
/* produce warning "error in %s (%s)" (where, msg) */
luaE_warning(L, "error in ", 1);
luaE_warning(L, where, 1);
luaE_warning(L, " (", 1);
luaE_warning(L, msg, 1);
luaE_warning(L, ")", 0);
}
LSTRING¶
/*
** $Id: lstring.h $
** String table (keep all strings handled by Lua)
** See Copyright Notice in lua.h
*/
#ifndef lstring_h
#define lstring_h
#include "lgc.h"
#include "lobject.h"
#include "lstate.h"
#include "_native_lua_config.h" /* native Lua */
/*
** Memory-allocation error message must be preallocated (it cannot
** be created after memory is exhausted)
*/
#define MEMERRMSG "not enough memory"
/*
** Size of a TString: Size of the header plus space for the string
** itself (including final '\0').
*/
#define sizelstring(l) (offsetof(TString, contents) + ((l) + 1) * sizeof(char))
#define luaS_newliteral(L, s) (luaS_newlstr(L, "" s, \
(sizeof(s)/sizeof(char))-1))
/*
** test whether a string is a reserved word
*/
#define isreserved(s) ((s)->tt == LUA_VSHRSTR && (s)->extra > 0)
/*
** equality for short strings, which are always internalized
*/
#define eqshrstr(a,b) check_exp((a)->tt == LUA_VSHRSTR, (a) == (b))
LUAI_FUNC unsigned int luaS_hash (const char *str, size_t l,
unsigned int seed, size_t step);
LUAI_FUNC unsigned int luaS_hashlongstr (TString *ts);
LUAI_FUNC int luaS_eqlngstr (TString *a, TString *b);
LUAI_FUNC void luaS_resize (lua_State *L, int newsize);
LUAI_FUNC void luaS_clearcache (global_State *g);
LUAI_FUNC void luaS_init (lua_State *L);
LUAI_FUNC void luaS_remove (lua_State *L, TString *ts);
LUAI_FUNC Udata *luaS_newudata (lua_State *L, size_t s, int nuvalue);
LUAI_FUNC TString *luaS_newlstr (lua_State *L, const char *str, size_t l);
LUAI_FUNC TString *luaS_new (lua_State *L, const char *str);
LUAI_FUNC TString *luaS_createlngstrobj (lua_State *L, size_t l);
#endif
/*
** $Id: lstring.c $
** String table (keeps all strings handled by Lua)
** See Copyright Notice in lua.h
*/
#define lstring_c
#define LUA_CORE
#include "lprefix.h"
#include <string.h>
#include "lua.h"
#include "ldebug.h"
#include "ldo.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
#include "lstring.h"
/*
** Lua will use at most ~(2^LUAI_HASHLIMIT) bytes from a long string to
** compute its hash
*/
#if !defined(LUAI_HASHLIMIT)
#define LUAI_HASHLIMIT 5
#endif
/*
** Maximum size for string table.
*/
#define MAXSTRTB cast_int(luaM_limitN(MAX_INT, TString*))
/*
** equality for long strings
*/
int luaS_eqlngstr (TString *a, TString *b) {
size_t len = a->u.lnglen;
lua_assert(a->tt == LUA_VLNGSTR && b->tt == LUA_VLNGSTR);
return (a == b) || /* same instance or... */
((len == b->u.lnglen) && /* equal length and ... */
(memcmp(getstr(a), getstr(b), len) == 0)); /* equal contents */
}
unsigned int luaS_hash (const char *str, size_t l, unsigned int seed,
size_t step) {
unsigned int h = seed ^ cast_uint(l);
for (; l >= step; l -= step)
h ^= ((h<<5) + (h>>2) + cast_byte(str[l - 1]));
return h;
}
unsigned int luaS_hashlongstr (TString *ts) {
lua_assert(ts->tt == LUA_VLNGSTR);
if (ts->extra == 0) { /* no hash? */
size_t len = ts->u.lnglen;
size_t step = (len >> LUAI_HASHLIMIT) + 1;
ts->hash = luaS_hash(getstr(ts), len, ts->hash, step);
ts->extra = 1; /* now it has its hash */
}
return ts->hash;
}
static void tablerehash (TString **vect, int osize, int nsize) {
int i;
for (i = osize; i < nsize; i++) /* clear new elements */
vect[i] = NULL;
for (i = 0; i < osize; i++) { /* rehash old part of the array */
TString *p = vect[i];
vect[i] = NULL;
while (p) { /* for each string in the list */
TString *hnext = p->u.hnext; /* save next */
unsigned int h = lmod(p->hash, nsize); /* new position */
p->u.hnext = vect[h]; /* chain it into array */
vect[h] = p;
p = hnext;
}
}
}
/*
** Resize the string table. If allocation fails, keep the current size.
** (This can degrade performance, but any non-zero size should work
** correctly.)
*/
void luaS_resize (lua_State *L, int nsize) {
stringtable *tb = &G(L)->strt;
int osize = tb->size;
TString **newvect;
if (nsize < osize) /* shrinking table? */
tablerehash(tb->hash, osize, nsize); /* depopulate shrinking part */
newvect = luaM_reallocvector(L, tb->hash, osize, nsize, TString*);
if (unlikely(newvect == NULL)) { /* reallocation failed? */
if (nsize < osize) /* was it shrinking table? */
tablerehash(tb->hash, nsize, osize); /* restore to original size */
/* leave table as it was */
}
else { /* allocation succeeded */
tb->hash = newvect;
tb->size = nsize;
if (nsize > osize)
tablerehash(newvect, osize, nsize); /* rehash for new size */
}
}
/*
** Clear API string cache. (Entries cannot be empty, so fill them with
** a non-collectable string.)
*/
void luaS_clearcache (global_State *g) {
int i, j;
for (i = 0; i < STRCACHE_N; i++)
for (j = 0; j < STRCACHE_M; j++) {
if (iswhite(g->strcache[i][j])) /* will entry be collected? */
g->strcache[i][j] = g->memerrmsg; /* replace it with something fixed */
}
}
/*
** Initialize the string table and the string cache
*/
void luaS_init (lua_State *L) {
global_State *g = G(L);
int i, j;
stringtable *tb = &G(L)->strt;
tb->hash = luaM_newvector(L, MINSTRTABSIZE, TString*);
tablerehash(tb->hash, 0, MINSTRTABSIZE); /* clear array */
tb->size = MINSTRTABSIZE;
/* pre-create memory-error message */
g->memerrmsg = luaS_newliteral(L, MEMERRMSG);
luaC_fix(L, obj2gco(g->memerrmsg)); /* it should never be collected */
for (i = 0; i < STRCACHE_N; i++) /* fill cache with valid strings */
for (j = 0; j < STRCACHE_M; j++)
g->strcache[i][j] = g->memerrmsg;
}
/*
** creates a new string object
*/
static TString *createstrobj (lua_State *L, size_t l, int tag, unsigned int h) {
TString *ts;
GCObject *o;
size_t totalsize; /* total size of TString object */
totalsize = sizelstring(l);
o = luaC_newobj(L, tag, totalsize);
ts = gco2ts(o);
ts->hash = h;
ts->extra = 0;
getstr(ts)[l] = '\0'; /* ending 0 */
return ts;
}
TString *luaS_createlngstrobj (lua_State *L, size_t l) {
TString *ts = createstrobj(L, l, LUA_VLNGSTR, G(L)->seed);
ts->u.lnglen = l;
return ts;
}
void luaS_remove (lua_State *L, TString *ts) {
stringtable *tb = &G(L)->strt;
TString **p = &tb->hash[lmod(ts->hash, tb->size)];
while (*p != ts) /* find previous element */
p = &(*p)->u.hnext;
*p = (*p)->u.hnext; /* remove element from its list */
tb->nuse--;
}
static void growstrtab (lua_State *L, stringtable *tb) {
if (unlikely(tb->nuse == MAX_INT)) { /* too many strings? */
luaC_fullgc(L, 1); /* try to free some... */
if (tb->nuse == MAX_INT) /* still too many? */
luaM_error(L); /* cannot even create a message... */
}
if (tb->size <= MAXSTRTB / 2) /* can grow string table? */
luaS_resize(L, tb->size * 2);
}
/*
** Checks whether short string exists and reuses it or creates a new one.
*/
static TString *internshrstr (lua_State *L, const char *str, size_t l) {
TString *ts;
global_State *g = G(L);
stringtable *tb = &g->strt;
unsigned int h = luaS_hash(str, l, g->seed, 1);
TString **list = &tb->hash[lmod(h, tb->size)];
lua_assert(str != NULL); /* otherwise 'memcmp'/'memcpy' are undefined */
for (ts = *list; ts != NULL; ts = ts->u.hnext) {
if (l == ts->shrlen && (memcmp(str, getstr(ts), l * sizeof(char)) == 0)) {
/* found! */
if (isdead(g, ts)) /* dead (but not collected yet)? */
changewhite(ts); /* resurrect it */
return ts;
}
}
/* else must create a new string */
if (tb->nuse >= tb->size) { /* need to grow string table? */
growstrtab(L, tb);
list = &tb->hash[lmod(h, tb->size)]; /* rehash with new size */
}
ts = createstrobj(L, l, LUA_VSHRSTR, h);
memcpy(getstr(ts), str, l * sizeof(char));
ts->shrlen = cast_byte(l);
ts->u.hnext = *list;
*list = ts;
tb->nuse++;
return ts;
}
/*
** new string (with explicit length)
*/
TString *luaS_newlstr (lua_State *L, const char *str, size_t l) {
if (l <= LUAI_MAXSHORTLEN) /* short string? */
return internshrstr(L, str, l);
else {
TString *ts;
if (unlikely(l >= (MAX_SIZE - sizeof(TString))/sizeof(char)))
luaM_toobig(L);
ts = luaS_createlngstrobj(L, l);
memcpy(getstr(ts), str, l * sizeof(char));
return ts;
}
}
/*
** Create or reuse a zero-terminated string, first checking in the
** cache (using the string address as a key). The cache can contain
** only zero-terminated strings, so it is safe to use 'strcmp' to
** check hits.
*/
TString *luaS_new (lua_State *L, const char *str) {
unsigned int i = point2uint(str) % STRCACHE_N; /* hash */
int j;
TString **p = G(L)->strcache[i];
for (j = 0; j < STRCACHE_M; j++) {
if (strcmp(str, getstr(p[j])) == 0) /* hit? */
return p[j]; /* that is it */
}
/* normal route */
for (j = STRCACHE_M - 1; j > 0; j--)
p[j] = p[j - 1]; /* move out last element */
/* new element is first in the list */
p[0] = luaS_newlstr(L, str, strlen(str));
return p[0];
}
Udata *luaS_newudata (lua_State *L, size_t s, int nuvalue) {
Udata *u;
int i;
GCObject *o;
if (unlikely(s > MAX_SIZE - udatamemoffset(nuvalue)))
luaM_toobig(L);
o = luaC_newobj(L, LUA_VUSERDATA, sizeudata(nuvalue, s));
u = gco2u(o);
u->len = s;
u->nuvalue = nuvalue;
u->metatable = NULL;
for (i = 0; i < nuvalue; i++)
setnilvalue(&u->uv[i].uv);
return u;
}
LSTRLIB¶
/*
** $Id: lstrlib.c $
** Standard library for string operations and pattern-matching
** See Copyright Notice in lua.h
*/
#define lstrlib_c
#define LUA_LIB
#include "lprefix.h"
#include <ctype.h>
#include <float.h>
#include <limits.h>
#include <locale.h>
#include <math.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "_native_lua_config.h" /* native Lua */
/*
** maximum number of captures that a pattern can do during
** pattern-matching. This limit is arbitrary, but must fit in
** an unsigned char.
*/
#if !defined(LUA_MAXCAPTURES)
#define LUA_MAXCAPTURES 32
#endif
/* macro to 'unsign' a character */
#define uchar(c) ((unsigned char)(c))
/*
** Some sizes are better limited to fit in 'int', but must also fit in
** 'size_t'. (We assume that 'lua_Integer' cannot be smaller than 'int'.)
*/
#define MAX_SIZET ((size_t)(~(size_t)0))
#define MAXSIZE \
(sizeof(size_t) < sizeof(int) ? MAX_SIZET : (size_t)(INT_MAX))
static int str_len (lua_State *L) {
size_t l;
luaL_checklstring(L, 1, &l);
lua_pushinteger(L, (lua_Integer)l);
return 1;
}
/*
** translate a relative initial string position
** (negative means back from end): clip result to [1, inf).
** The length of any string in Lua must fit in a lua_Integer,
** so there are no overflows in the casts.
** The inverted comparison avoids a possible overflow
** computing '-pos'.
*/
static size_t posrelatI (lua_Integer pos, size_t len) {
if (pos > 0)
return (size_t)pos;
else if (pos == 0)
return 1;
else if (pos < -(lua_Integer)len) /* inverted comparison */
return 1; /* clip to 1 */
else return len + (size_t)pos + 1;
}
/*
** Gets an optional ending string position from argument 'arg',
** with default value 'def'.
** Negative means back from end: clip result to [0, len]
*/
static size_t getendpos (lua_State *L, int arg, lua_Integer def,
size_t len) {
lua_Integer pos = luaL_optinteger(L, arg, def);
if (pos > (lua_Integer)len)
return len;
else if (pos >= 0)
return (size_t)pos;
else if (pos < -(lua_Integer)len)
return 0;
else return len + (size_t)pos + 1;
}
static int str_sub (lua_State *L) {
size_t l;
const char *s = luaL_checklstring(L, 1, &l);
size_t start = posrelatI(luaL_checkinteger(L, 2), l);
size_t end = getendpos(L, 3, -1, l);
if (start <= end)
lua_pushlstring(L, s + start - 1, (end - start) + 1);
else lua_pushliteral(L, "");
return 1;
}
static int str_reverse (lua_State *L) {
size_t l, i;
luaL_Buffer b;
const char *s = luaL_checklstring(L, 1, &l);
char *p = luaL_buffinitsize(L, &b, l);
for (i = 0; i < l; i++)
p[i] = s[l - i - 1];
luaL_pushresultsize(&b, l);
return 1;
}
static int str_lower (lua_State *L) {
size_t l;
size_t i;
luaL_Buffer b;
const char *s = luaL_checklstring(L, 1, &l);
char *p = luaL_buffinitsize(L, &b, l);
for (i=0; i<l; i++)
p[i] = tolower(uchar(s[i]));
luaL_pushresultsize(&b, l);
return 1;
}
static int str_upper (lua_State *L) {
size_t l;
size_t i;
luaL_Buffer b;
const char *s = luaL_checklstring(L, 1, &l);
char *p = luaL_buffinitsize(L, &b, l);
for (i=0; i<l; i++)
p[i] = toupper(uchar(s[i]));
luaL_pushresultsize(&b, l);
return 1;
}
static int str_rep (lua_State *L) {
size_t l, lsep;
const char *s = luaL_checklstring(L, 1, &l);
lua_Integer n = luaL_checkinteger(L, 2);
const char *sep = luaL_optlstring(L, 3, "", &lsep);
if (n <= 0) lua_pushliteral(L, "");
else if (l + lsep < l || l + lsep > MAXSIZE / n) /* may overflow? */
return luaL_error(L, "resulting string too large");
else {
size_t totallen = (size_t)n * l + (size_t)(n - 1) * lsep;
luaL_Buffer b;
char *p = luaL_buffinitsize(L, &b, totallen);
while (n-- > 1) { /* first n-1 copies (followed by separator) */
memcpy(p, s, l * sizeof(char)); p += l;
if (lsep > 0) { /* empty 'memcpy' is not that cheap */
memcpy(p, sep, lsep * sizeof(char));
p += lsep;
}
}
memcpy(p, s, l * sizeof(char)); /* last copy (not followed by separator) */
luaL_pushresultsize(&b, totallen);
}
return 1;
}
static int str_byte (lua_State *L) {
size_t l;
const char *s = luaL_checklstring(L, 1, &l);
lua_Integer pi = luaL_optinteger(L, 2, 1);
size_t posi = posrelatI(pi, l);
size_t pose = getendpos(L, 3, pi, l);
int n, i;
if (posi > pose) return 0; /* empty interval; return no values */
if (pose - posi >= (size_t)INT_MAX) /* arithmetic overflow? */
return luaL_error(L, "string slice too long");
n = (int)(pose - posi) + 1;
luaL_checkstack(L, n, "string slice too long");
for (i=0; i<n; i++)
lua_pushinteger(L, uchar(s[posi+i-1]));
return n;
}
static int str_char (lua_State *L) {
int n = lua_gettop(L); /* number of arguments */
int i;
luaL_Buffer b;
char *p = luaL_buffinitsize(L, &b, n);
for (i=1; i<=n; i++) {
lua_Unsigned c = (lua_Unsigned)luaL_checkinteger(L, i);
luaL_argcheck(L, c <= (lua_Unsigned)UCHAR_MAX, i, "value out of range");
p[i - 1] = uchar(c);
}
luaL_pushresultsize(&b, n);
return 1;
}
/*
** Buffer to store the result of 'string.dump'. It must be initialized
** after the call to 'lua_dump', to ensure that the function is on the
** top of the stack when 'lua_dump' is called. ('luaL_buffinit' might
** push stuff.)
*/
struct str_Writer {
int init; /* true iff buffer has been initialized */
luaL_Buffer B;
};
static int writer (lua_State *L, const void *b, size_t size, void *ud) {
struct str_Writer *state = (struct str_Writer *)ud;
if (!state->init) {
state->init = 1;
luaL_buffinit(L, &state->B);
}
luaL_addlstring(&state->B, (const char *)b, size);
return 0;
}
static int str_dump (lua_State *L) {
struct str_Writer state;
int strip = lua_toboolean(L, 2);
luaL_checktype(L, 1, LUA_TFUNCTION);
lua_settop(L, 1); /* ensure function is on the top of the stack */
state.init = 0;
if (lua_dump(L, writer, &state, strip) != 0)
return luaL_error(L, "unable to dump given function");
luaL_pushresult(&state.B);
return 1;
}
/*
** {======================================================
** METAMETHODS
** =======================================================
*/
#if defined(LUA_NOCVTS2N) /* { */
/* no coercion from strings to numbers */
static const luaL_Reg stringmetamethods[] = {
{"__index", NULL}, /* placeholder */
{NULL, NULL}
};
#else /* }{ */
static int tonum (lua_State *L, int arg) {
if (lua_type(L, arg) == LUA_TNUMBER) { /* already a number? */
lua_pushvalue(L, arg);
return 1;
}
else { /* check whether it is a numerical string */
size_t len;
const char *s = lua_tolstring(L, arg, &len);
return (s != NULL && lua_stringtonumber(L, s) == len + 1);
}
}
static void trymt (lua_State *L, const char *mtname) {
lua_settop(L, 2); /* back to the original arguments */
if (lua_type(L, 2) == LUA_TSTRING || !luaL_getmetafield(L, 2, mtname))
luaL_error(L, "attempt to %s a '%s' with a '%s'", mtname + 2,
luaL_typename(L, -2), luaL_typename(L, -1));
lua_insert(L, -3); /* put metamethod before arguments */
lua_call(L, 2, 1); /* call metamethod */
}
static int arith (lua_State *L, int op, const char *mtname) {
if (tonum(L, 1) && tonum(L, 2))
lua_arith(L, op); /* result will be on the top */
else
trymt(L, mtname);
return 1;
}
static int arith_add (lua_State *L) {
return arith(L, LUA_OPADD, "__add");
}
static int arith_sub (lua_State *L) {
return arith(L, LUA_OPSUB, "__sub");
}
static int arith_mul (lua_State *L) {
return arith(L, LUA_OPMUL, "__mul");
}
static int arith_mod (lua_State *L) {
return arith(L, LUA_OPMOD, "__mod");
}
static int arith_pow (lua_State *L) {
return arith(L, LUA_OPPOW, "__pow");
}
static int arith_div (lua_State *L) {
return arith(L, LUA_OPDIV, "__div");
}
static int arith_idiv (lua_State *L) {
return arith(L, LUA_OPIDIV, "__idiv");
}
static int arith_unm (lua_State *L) {
return arith(L, LUA_OPUNM, "__unm");
}
static const luaL_Reg stringmetamethods[] = {
{"__add", arith_add},
{"__sub", arith_sub},
{"__mul", arith_mul},
{"__mod", arith_mod},
{"__pow", arith_pow},
{"__div", arith_div},
{"__idiv", arith_idiv},
{"__unm", arith_unm},
{"__index", NULL}, /* placeholder */
{NULL, NULL}
};
#endif /* } */
/* }====================================================== */
/*
** {======================================================
** PATTERN MATCHING
** =======================================================
*/
#define CAP_UNFINISHED (-1)
#define CAP_POSITION (-2)
typedef struct MatchState {
const char *src_init; /* init of source string */
const char *src_end; /* end ('\0') of source string */
const char *p_end; /* end ('\0') of pattern */
lua_State *L;
int matchdepth; /* control for recursive depth (to avoid C stack overflow) */
unsigned char level; /* total number of captures (finished or unfinished) */
struct {
const char *init;
ptrdiff_t len;
} capture[LUA_MAXCAPTURES];
} MatchState;
/* recursive function */
static const char *match (MatchState *ms, const char *s, const char *p);
/* maximum recursion depth for 'match' */
#if !defined(MAXCCALLS)
#define MAXCCALLS 200
#endif
#define L_ESC '%'
#define SPECIALS "^$*+?.([%-"
static int check_capture (MatchState *ms, int l) {
l -= '1';
if (l < 0 || l >= ms->level || ms->capture[l].len == CAP_UNFINISHED)
return luaL_error(ms->L, "invalid capture index %%%d", l + 1);
return l;
}
static int capture_to_close (MatchState *ms) {
int level = ms->level;
for (level--; level>=0; level--)
if (ms->capture[level].len == CAP_UNFINISHED) return level;
return luaL_error(ms->L, "invalid pattern capture");
}
static const char *classend (MatchState *ms, const char *p) {
switch (*p++) {
case L_ESC: {
if (p == ms->p_end)
luaL_error(ms->L, "malformed pattern (ends with '%%')");
return p+1;
}
case '[': {
if (*p == '^') p++;
do { /* look for a ']' */
if (p == ms->p_end)
luaL_error(ms->L, "malformed pattern (missing ']')");
if (*(p++) == L_ESC && p < ms->p_end)
p++; /* skip escapes (e.g. '%]') */
} while (*p != ']');
return p+1;
}
default: {
return p;
}
}
}
static int match_class (int c, int cl) {
int res;
switch (tolower(cl)) {
case 'a' : res = isalpha(c); break;
case 'c' : res = iscntrl(c); break;
case 'd' : res = isdigit(c); break;
case 'g' : res = isgraph(c); break;
case 'l' : res = islower(c); break;
case 'p' : res = ispunct(c); break;
case 's' : res = isspace(c); break;
case 'u' : res = isupper(c); break;
case 'w' : res = isalnum(c); break;
case 'x' : res = isxdigit(c); break;
case 'z' : res = (c == 0); break; /* deprecated option */
default: return (cl == c);
}
return (islower(cl) ? res : !res);
}
static int matchbracketclass (int c, const char *p, const char *ec) {
int sig = 1;
if (*(p+1) == '^') {
sig = 0;
p++; /* skip the '^' */
}
while (++p < ec) {
if (*p == L_ESC) {
p++;
if (match_class(c, uchar(*p)))
return sig;
}
else if ((*(p+1) == '-') && (p+2 < ec)) {
p+=2;
if (uchar(*(p-2)) <= c && c <= uchar(*p))
return sig;
}
else if (uchar(*p) == c) return sig;
}
return !sig;
}
static int singlematch (MatchState *ms, const char *s, const char *p,
const char *ep) {
if (s >= ms->src_end)
return 0;
else {
int c = uchar(*s);
switch (*p) {
case '.': return 1; /* matches any char */
case L_ESC: return match_class(c, uchar(*(p+1)));
case '[': return matchbracketclass(c, p, ep-1);
default: return (uchar(*p) == c);
}
}
}
static const char *matchbalance (MatchState *ms, const char *s,
const char *p) {
if (p >= ms->p_end - 1)
luaL_error(ms->L, "malformed pattern (missing arguments to '%%b')");
if (*s != *p) return NULL;
else {
int b = *p;
int e = *(p+1);
int cont = 1;
while (++s < ms->src_end) {
if (*s == e) {
if (--cont == 0) return s+1;
}
else if (*s == b) cont++;
}
}
return NULL; /* string ends out of balance */
}
static const char *max_expand (MatchState *ms, const char *s,
const char *p, const char *ep) {
ptrdiff_t i = 0; /* counts maximum expand for item */
while (singlematch(ms, s + i, p, ep))
i++;
/* keeps trying to match with the maximum repetitions */
while (i>=0) {
const char *res = match(ms, (s+i), ep+1);
if (res) return res;
i--; /* else didn't match; reduce 1 repetition to try again */
}
return NULL;
}
static const char *min_expand (MatchState *ms, const char *s,
const char *p, const char *ep) {
for (;;) {
const char *res = match(ms, s, ep+1);
if (res != NULL)
return res;
else if (singlematch(ms, s, p, ep))
s++; /* try with one more repetition */
else return NULL;
}
}
static const char *start_capture (MatchState *ms, const char *s,
const char *p, int what) {
const char *res;
int level = ms->level;
if (level >= LUA_MAXCAPTURES) luaL_error(ms->L, "too many captures");
ms->capture[level].init = s;
ms->capture[level].len = what;
ms->level = level+1;
if ((res=match(ms, s, p)) == NULL) /* match failed? */
ms->level--; /* undo capture */
return res;
}
static const char *end_capture (MatchState *ms, const char *s,
const char *p) {
int l = capture_to_close(ms);
const char *res;
ms->capture[l].len = s - ms->capture[l].init; /* close capture */
if ((res = match(ms, s, p)) == NULL) /* match failed? */
ms->capture[l].len = CAP_UNFINISHED; /* undo capture */
return res;
}
static const char *match_capture (MatchState *ms, const char *s, int l) {
size_t len;
l = check_capture(ms, l);
len = ms->capture[l].len;
if ((size_t)(ms->src_end-s) >= len &&
memcmp(ms->capture[l].init, s, len) == 0)
return s+len;
else return NULL;
}
static const char *match (MatchState *ms, const char *s, const char *p) {
if (ms->matchdepth-- == 0)
luaL_error(ms->L, "pattern too complex");
init: /* using goto's to optimize tail recursion */
if (p != ms->p_end) { /* end of pattern? */
switch (*p) {
case '(': { /* start capture */
if (*(p + 1) == ')') /* position capture? */
s = start_capture(ms, s, p + 2, CAP_POSITION);
else
s = start_capture(ms, s, p + 1, CAP_UNFINISHED);
break;
}
case ')': { /* end capture */
s = end_capture(ms, s, p + 1);
break;
}
case '$': {
if ((p + 1) != ms->p_end) /* is the '$' the last char in pattern? */
goto dflt; /* no; go to default */
s = (s == ms->src_end) ? s : NULL; /* check end of string */
break;
}
case L_ESC: { /* escaped sequences not in the format class[*+?-]? */
switch (*(p + 1)) {
case 'b': { /* balanced string? */
s = matchbalance(ms, s, p + 2);
if (s != NULL) {
p += 4; goto init; /* return match(ms, s, p + 4); */
} /* else fail (s == NULL) */
break;
}
case 'f': { /* frontier? */
const char *ep; char previous;
p += 2;
if (*p != '[')
luaL_error(ms->L, "missing '[' after '%%f' in pattern");
ep = classend(ms, p); /* points to what is next */
previous = (s == ms->src_init) ? '\0' : *(s - 1);
if (!matchbracketclass(uchar(previous), p, ep - 1) &&
matchbracketclass(uchar(*s), p, ep - 1)) {
p = ep; goto init; /* return match(ms, s, ep); */
}
s = NULL; /* match failed */
break;
}
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
case '8': case '9': { /* capture results (%0-%9)? */
s = match_capture(ms, s, uchar(*(p + 1)));
if (s != NULL) {
p += 2; goto init; /* return match(ms, s, p + 2) */
}
break;
}
default: goto dflt;
}
break;
}
default: dflt: { /* pattern class plus optional suffix */
const char *ep = classend(ms, p); /* points to optional suffix */
/* does not match at least once? */
if (!singlematch(ms, s, p, ep)) {
if (*ep == '*' || *ep == '?' || *ep == '-') { /* accept empty? */
p = ep + 1; goto init; /* return match(ms, s, ep + 1); */
}
else /* '+' or no suffix */
s = NULL; /* fail */
}
else { /* matched once */
switch (*ep) { /* handle optional suffix */
case '?': { /* optional */
const char *res;
if ((res = match(ms, s + 1, ep + 1)) != NULL)
s = res;
else {
p = ep + 1; goto init; /* else return match(ms, s, ep + 1); */
}
break;
}
case '+': /* 1 or more repetitions */
s++; /* 1 match already done */
/* FALLTHROUGH */
case '*': /* 0 or more repetitions */
s = max_expand(ms, s, p, ep);
break;
case '-': /* 0 or more repetitions (minimum) */
s = min_expand(ms, s, p, ep);
break;
default: /* no suffix */
s++; p = ep; goto init; /* return match(ms, s + 1, ep); */
}
}
break;
}
}
}
ms->matchdepth++;
return s;
}
static const char *lmemfind (const char *s1, size_t l1,
const char *s2, size_t l2) {
if (l2 == 0) return s1; /* empty strings are everywhere */
else if (l2 > l1) return NULL; /* avoids a negative 'l1' */
else {
const char *init; /* to search for a '*s2' inside 's1' */
l2--; /* 1st char will be checked by 'memchr' */
l1 = l1-l2; /* 's2' cannot be found after that */
while (l1 > 0 && (init = (const char *)memchr(s1, *s2, l1)) != NULL) {
init++; /* 1st char is already checked */
if (memcmp(init, s2+1, l2) == 0)
return init-1;
else { /* correct 'l1' and 's1' to try again */
l1 -= init-s1;
s1 = init;
}
}
return NULL; /* not found */
}
}
/*
** get information about the i-th capture. If there are no captures
** and 'i==0', return information about the whole match, which
** is the range 's'..'e'. If the capture is a string, return
** its length and put its address in '*cap'. If it is an integer
** (a position), push it on the stack and return CAP_POSITION.
*/
static size_t get_onecapture (MatchState *ms, int i, const char *s,
const char *e, const char **cap) {
if (i >= ms->level) {
if (i != 0)
luaL_error(ms->L, "invalid capture index %%%d", i + 1);
*cap = s;
return e - s;
}
else {
ptrdiff_t capl = ms->capture[i].len;
*cap = ms->capture[i].init;
if (capl == CAP_UNFINISHED)
luaL_error(ms->L, "unfinished capture");
else if (capl == CAP_POSITION)
lua_pushinteger(ms->L, (ms->capture[i].init - ms->src_init) + 1);
return capl;
}
}
/*
** Push the i-th capture on the stack.
*/
static void push_onecapture (MatchState *ms, int i, const char *s,
const char *e) {
const char *cap;
ptrdiff_t l = get_onecapture(ms, i, s, e, &cap);
if (l != CAP_POSITION)
lua_pushlstring(ms->L, cap, l);
/* else position was already pushed */
}
static int push_captures (MatchState *ms, const char *s, const char *e) {
int i;
int nlevels = (ms->level == 0 && s) ? 1 : ms->level;
luaL_checkstack(ms->L, nlevels, "too many captures");
for (i = 0; i < nlevels; i++)
push_onecapture(ms, i, s, e);
return nlevels; /* number of strings pushed */
}
/* check whether pattern has no special characters */
static int nospecials (const char *p, size_t l) {
size_t upto = 0;
do {
if (strpbrk(p + upto, SPECIALS))
return 0; /* pattern has a special character */
upto += strlen(p + upto) + 1; /* may have more after \0 */
} while (upto <= l);
return 1; /* no special chars found */
}
static void prepstate (MatchState *ms, lua_State *L,
const char *s, size_t ls, const char *p, size_t lp) {
ms->L = L;
ms->matchdepth = MAXCCALLS;
ms->src_init = s;
ms->src_end = s + ls;
ms->p_end = p + lp;
}
static void reprepstate (MatchState *ms) {
ms->level = 0;
lua_assert(ms->matchdepth == MAXCCALLS);
}
static int str_find_aux (lua_State *L, int find) {
size_t ls, lp;
const char *s = luaL_checklstring(L, 1, &ls);
const char *p = luaL_checklstring(L, 2, &lp);
size_t init = posrelatI(luaL_optinteger(L, 3, 1), ls) - 1;
if (init > ls) { /* start after string's end? */
luaL_pushfail(L); /* cannot find anything */
return 1;
}
/* explicit request or no special characters? */
if (find && (lua_toboolean(L, 4) || nospecials(p, lp))) {
/* do a plain search */
const char *s2 = lmemfind(s + init, ls - init, p, lp);
if (s2) {
lua_pushinteger(L, (s2 - s) + 1);
lua_pushinteger(L, (s2 - s) + lp);
return 2;
}
}
else {
MatchState ms;
const char *s1 = s + init;
int anchor = (*p == '^');
if (anchor) {
p++; lp--; /* skip anchor character */
}
prepstate(&ms, L, s, ls, p, lp);
do {
const char *res;
reprepstate(&ms);
if ((res=match(&ms, s1, p)) != NULL) {
if (find) {
lua_pushinteger(L, (s1 - s) + 1); /* start */
lua_pushinteger(L, res - s); /* end */
return push_captures(&ms, NULL, 0) + 2;
}
else
return push_captures(&ms, s1, res);
}
} while (s1++ < ms.src_end && !anchor);
}
luaL_pushfail(L); /* not found */
return 1;
}
static int str_find (lua_State *L) {
return str_find_aux(L, 1);
}
static int str_match (lua_State *L) {
return str_find_aux(L, 0);
}
/* state for 'gmatch' */
typedef struct GMatchState {
const char *src; /* current position */
const char *p; /* pattern */
const char *lastmatch; /* end of last match */
MatchState ms; /* match state */
} GMatchState;
static int gmatch_aux (lua_State *L) {
GMatchState *gm = (GMatchState *)lua_touserdata(L, lua_upvalueindex(3));
const char *src;
gm->ms.L = L;
for (src = gm->src; src <= gm->ms.src_end; src++) {
const char *e;
reprepstate(&gm->ms);
if ((e = match(&gm->ms, src, gm->p)) != NULL && e != gm->lastmatch) {
gm->src = gm->lastmatch = e;
return push_captures(&gm->ms, src, e);
}
}
return 0; /* not found */
}
static int gmatch (lua_State *L) {
size_t ls, lp;
const char *s = luaL_checklstring(L, 1, &ls);
const char *p = luaL_checklstring(L, 2, &lp);
size_t init = posrelatI(luaL_optinteger(L, 3, 1), ls) - 1;
GMatchState *gm;
lua_settop(L, 2); /* keep strings on closure to avoid being collected */
gm = (GMatchState *)lua_newuserdatauv(L, sizeof(GMatchState), 0);
if (init > ls) /* start after string's end? */
init = ls + 1; /* avoid overflows in 's + init' */
prepstate(&gm->ms, L, s, ls, p, lp);
gm->src = s + init; gm->p = p; gm->lastmatch = NULL;
lua_pushcclosure(L, gmatch_aux, 3);
return 1;
}
static void add_s (MatchState *ms, luaL_Buffer *b, const char *s,
const char *e) {
size_t l;
lua_State *L = ms->L;
const char *news = lua_tolstring(L, 3, &l);
const char *p;
while ((p = (char *)memchr(news, L_ESC, l)) != NULL) {
luaL_addlstring(b, news, p - news);
p++; /* skip ESC */
if (*p == L_ESC) /* '%%' */
luaL_addchar(b, *p);
else if (*p == '0') /* '%0' */
luaL_addlstring(b, s, e - s);
else if (isdigit(uchar(*p))) { /* '%n' */
const char *cap;
ptrdiff_t resl = get_onecapture(ms, *p - '1', s, e, &cap);
if (resl == CAP_POSITION)
luaL_addvalue(b); /* add position to accumulated result */
else
luaL_addlstring(b, cap, resl);
}
else
luaL_error(L, "invalid use of '%c' in replacement string", L_ESC);
l -= p + 1 - news;
news = p + 1;
}
luaL_addlstring(b, news, l);
}
/*
** Add the replacement value to the string buffer 'b'.
** Return true if the original string was changed. (Function calls and
** table indexing resulting in nil or false do not change the subject.)
*/
static int add_value (MatchState *ms, luaL_Buffer *b, const char *s,
const char *e, int tr) {
lua_State *L = ms->L;
switch (tr) {
case LUA_TFUNCTION: { /* call the function */
int n;
lua_pushvalue(L, 3); /* push the function */
n = push_captures(ms, s, e); /* all captures as arguments */
lua_call(L, n, 1); /* call it */
break;
}
case LUA_TTABLE: { /* index the table */
push_onecapture(ms, 0, s, e); /* first capture is the index */
lua_gettable(L, 3);
break;
}
default: { /* LUA_TNUMBER or LUA_TSTRING */
add_s(ms, b, s, e); /* add value to the buffer */
return 1; /* something changed */
}
}
if (!lua_toboolean(L, -1)) { /* nil or false? */
lua_pop(L, 1); /* remove value */
luaL_addlstring(b, s, e - s); /* keep original text */
return 0; /* no changes */
}
else if (!lua_isstring(L, -1))
return luaL_error(L, "invalid replacement value (a %s)",
luaL_typename(L, -1));
else {
luaL_addvalue(b); /* add result to accumulator */
return 1; /* something changed */
}
}
static int str_gsub (lua_State *L) {
size_t srcl, lp;
const char *src = luaL_checklstring(L, 1, &srcl); /* subject */
const char *p = luaL_checklstring(L, 2, &lp); /* pattern */
const char *lastmatch = NULL; /* end of last match */
int tr = lua_type(L, 3); /* replacement type */
lua_Integer max_s = luaL_optinteger(L, 4, srcl + 1); /* max replacements */
int anchor = (*p == '^');
lua_Integer n = 0; /* replacement count */
int changed = 0; /* change flag */
MatchState ms;
luaL_Buffer b;
luaL_argexpected(L, tr == LUA_TNUMBER || tr == LUA_TSTRING ||
tr == LUA_TFUNCTION || tr == LUA_TTABLE, 3,
"string/function/table");
luaL_buffinit(L, &b);
if (anchor) {
p++; lp--; /* skip anchor character */
}
prepstate(&ms, L, src, srcl, p, lp);
while (n < max_s) {
const char *e;
reprepstate(&ms); /* (re)prepare state for new match */
if ((e = match(&ms, src, p)) != NULL && e != lastmatch) { /* match? */
n++;
changed = add_value(&ms, &b, src, e, tr) | changed;
src = lastmatch = e;
}
else if (src < ms.src_end) /* otherwise, skip one character */
luaL_addchar(&b, *src++);
else break; /* end of subject */
if (anchor) break;
}
if (!changed) /* no changes? */
lua_pushvalue(L, 1); /* return original string */
else { /* something changed */
luaL_addlstring(&b, src, ms.src_end-src);
luaL_pushresult(&b); /* create and return new string */
}
lua_pushinteger(L, n); /* number of substitutions */
return 2;
}
/* }====================================================== */
/*
** {======================================================
** STRING FORMAT
** =======================================================
*/
#if !defined(lua_number2strx) /* { */
/*
** Hexadecimal floating-point formatter
*/
#define SIZELENMOD (sizeof(LUA_NUMBER_FRMLEN)/sizeof(char))
/*
** Number of bits that goes into the first digit. It can be any value
** between 1 and 4; the following definition tries to align the number
** to nibble boundaries by making what is left after that first digit a
** multiple of 4.
*/
#define L_NBFD ((l_floatatt(MANT_DIG) - 1)%4 + 1)
/*
** Add integer part of 'x' to buffer and return new 'x'
*/
static lua_Number adddigit (char *buff, int n, lua_Number x) {
lua_Number dd = l_mathop(floor)(x); /* get integer part from 'x' */
int d = (int)dd;
buff[n] = (d < 10 ? d + '0' : d - 10 + 'a'); /* add to buffer */
return x - dd; /* return what is left */
}
static int num2straux (char *buff, int sz, lua_Number x) {
/* if 'inf' or 'NaN', format it like '%g' */
if (x != x || x == (lua_Number)HUGE_VAL || x == -(lua_Number)HUGE_VAL)
return l_sprintf(buff, sz, LUA_NUMBER_FMT, (LUAI_UACNUMBER)x);
else if (x == 0) { /* can be -0... */
/* create "0" or "-0" followed by exponent */
return l_sprintf(buff, sz, LUA_NUMBER_FMT "x0p+0", (LUAI_UACNUMBER)x);
}
else {
int e;
lua_Number m = l_mathop(frexp)(x, &e); /* 'x' fraction and exponent */
int n = 0; /* character count */
if (m < 0) { /* is number negative? */
buff[n++] = '-'; /* add sign */
m = -m; /* make it positive */
}
buff[n++] = '0'; buff[n++] = 'x'; /* add "0x" */
m = adddigit(buff, n++, m * (1 << L_NBFD)); /* add first digit */
e -= L_NBFD; /* this digit goes before the radix point */
if (m > 0) { /* more digits? */
buff[n++] = lua_getlocaledecpoint(); /* add radix point */
do { /* add as many digits as needed */
m = adddigit(buff, n++, m * 16);
} while (m > 0);
}
n += l_sprintf(buff + n, sz - n, "p%+d", e); /* add exponent */
lua_assert(n < sz);
return n;
}
}
static int lua_number2strx (lua_State *L, char *buff, int sz,
const char *fmt, lua_Number x) {
int n = num2straux(buff, sz, x);
if (fmt[SIZELENMOD] == 'A') {
int i;
for (i = 0; i < n; i++)
buff[i] = toupper(uchar(buff[i]));
}
else if (fmt[SIZELENMOD] != 'a')
return luaL_error(L, "modifiers for format '%%a'/'%%A' not implemented");
return n;
}
#endif /* } */
/*
** Maximum size for items formatted with '%f'. This size is produced
** by format('%.99f', -maxfloat), and is equal to 99 + 3 ('-', '.',
** and '\0') + number of decimal digits to represent maxfloat (which
** is maximum exponent + 1). (99+3+1, adding some extra, 110)
*/
#define MAX_ITEMF (110 + l_floatatt(MAX_10_EXP))
/*
** All formats except '%f' do not need that large limit. The other
** float formats use exponents, so that they fit in the 99 limit for
** significant digits; 's' for large strings and 'q' add items directly
** to the buffer; all integer formats also fit in the 99 limit. The
** worst case are floats: they may need 99 significant digits, plus
** '0x', '-', '.', 'e+XXXX', and '\0'. Adding some extra, 120.
*/
#define MAX_ITEM 120
/* valid flags in a format specification */
#if !defined(L_FMTFLAGS)
#define L_FMTFLAGS "-+ #0"
#endif
/*
** maximum size of each format specification (such as "%-099.99d")
*/
#define MAX_FORMAT 32
static void addquoted (luaL_Buffer *b, const char *s, size_t len) {
luaL_addchar(b, '"');
while (len--) {
if (*s == '"' || *s == '\\' || *s == '\n') {
luaL_addchar(b, '\\');
luaL_addchar(b, *s);
}
else if (iscntrl(uchar(*s))) {
char buff[10];
if (!isdigit(uchar(*(s+1))))
l_sprintf(buff, sizeof(buff), "\\%d", (int)uchar(*s));
else
l_sprintf(buff, sizeof(buff), "\\%03d", (int)uchar(*s));
luaL_addstring(b, buff);
}
else
luaL_addchar(b, *s);
s++;
}
luaL_addchar(b, '"');
}
/*
** Serialize a floating-point number in such a way that it can be
** scanned back by Lua. Use hexadecimal format for "common" numbers
** (to preserve precision); inf, -inf, and NaN are handled separately.
** (NaN cannot be expressed as a numeral, so we write '(0/0)' for it.)
*/
static int quotefloat (lua_State *L, char *buff, lua_Number n) {
const char *s; /* for the fixed representations */
if (n == (lua_Number)HUGE_VAL) /* inf? */
s = "1e9999";
else if (n == -(lua_Number)HUGE_VAL) /* -inf? */
s = "-1e9999";
else if (n != n) /* NaN? */
s = "(0/0)";
else { /* format number as hexadecimal */
int nb = lua_number2strx(L, buff, MAX_ITEM,
"%" LUA_NUMBER_FRMLEN "a", n);
/* ensures that 'buff' string uses a dot as the radix character */
if (memchr(buff, '.', nb) == NULL) { /* no dot? */
char point = lua_getlocaledecpoint(); /* try locale point */
char *ppoint = (char *)memchr(buff, point, nb);
if (ppoint) *ppoint = '.'; /* change it to a dot */
}
return nb;
}
/* for the fixed representations */
return l_sprintf(buff, MAX_ITEM, "%s", s);
}
static void addliteral (lua_State *L, luaL_Buffer *b, int arg) {
switch (lua_type(L, arg)) {
case LUA_TSTRING: {
size_t len;
const char *s = lua_tolstring(L, arg, &len);
addquoted(b, s, len);
break;
}
case LUA_TNUMBER: {
char *buff = luaL_prepbuffsize(b, MAX_ITEM);
int nb;
if (!lua_isinteger(L, arg)) /* float? */
nb = quotefloat(L, buff, lua_tonumber(L, arg));
else { /* integers */
lua_Integer n = lua_tointeger(L, arg);
const char *format = (n == LUA_MININTEGER) /* corner case? */
? "0x%" LUA_INTEGER_FRMLEN "x" /* use hex */
: LUA_INTEGER_FMT; /* else use default format */
nb = l_sprintf(buff, MAX_ITEM, format, (LUAI_UACINT)n);
}
luaL_addsize(b, nb);
break;
}
case LUA_TNIL: case LUA_TBOOLEAN: {
luaL_tolstring(L, arg, NULL);
luaL_addvalue(b);
break;
}
default: {
luaL_argerror(L, arg, "value has no literal form");
}
}
}
static const char *scanformat (lua_State *L, const char *strfrmt, char *form) {
const char *p = strfrmt;
while (*p != '\0' && strchr(L_FMTFLAGS, *p) != NULL) p++; /* skip flags */
if ((size_t)(p - strfrmt) >= sizeof(L_FMTFLAGS)/sizeof(char))
luaL_error(L, "invalid format (repeated flags)");
if (isdigit(uchar(*p))) p++; /* skip width */
if (isdigit(uchar(*p))) p++; /* (2 digits at most) */
if (*p == '.') {
p++;
if (isdigit(uchar(*p))) p++; /* skip precision */
if (isdigit(uchar(*p))) p++; /* (2 digits at most) */
}
if (isdigit(uchar(*p)))
luaL_error(L, "invalid format (width or precision too long)");
*(form++) = '%';
memcpy(form, strfrmt, ((p - strfrmt) + 1) * sizeof(char));
form += (p - strfrmt) + 1;
*form = '\0';
return p;
}
/*
** add length modifier into formats
*/
static void addlenmod (char *form, const char *lenmod) {
size_t l = strlen(form);
size_t lm = strlen(lenmod);
char spec = form[l - 1];
strcpy(form + l - 1, lenmod);
form[l + lm - 1] = spec;
form[l + lm] = '\0';
}
static int str_format (lua_State *L) {
int top = lua_gettop(L);
int arg = 1;
size_t sfl;
const char *strfrmt = luaL_checklstring(L, arg, &sfl);
const char *strfrmt_end = strfrmt+sfl;
luaL_Buffer b;
luaL_buffinit(L, &b);
while (strfrmt < strfrmt_end) {
if (*strfrmt != L_ESC)
luaL_addchar(&b, *strfrmt++);
else if (*++strfrmt == L_ESC)
luaL_addchar(&b, *strfrmt++); /* %% */
else { /* format item */
char form[MAX_FORMAT]; /* to store the format ('%...') */
int maxitem = MAX_ITEM;
char *buff = luaL_prepbuffsize(&b, maxitem); /* to put formatted item */
int nb = 0; /* number of bytes in added item */
if (++arg > top)
return luaL_argerror(L, arg, "no value");
strfrmt = scanformat(L, strfrmt, form);
switch (*strfrmt++) {
case 'c': {
nb = l_sprintf(buff, maxitem, form, (int)luaL_checkinteger(L, arg));
break;
}
case 'd': case 'i':
case 'o': case 'u': case 'x': case 'X': {
lua_Integer n = luaL_checkinteger(L, arg);
addlenmod(form, LUA_INTEGER_FRMLEN);
nb = l_sprintf(buff, maxitem, form, (LUAI_UACINT)n);
break;
}
case 'a': case 'A':
addlenmod(form, LUA_NUMBER_FRMLEN);
nb = lua_number2strx(L, buff, maxitem, form,
luaL_checknumber(L, arg));
break;
case 'f':
maxitem = MAX_ITEMF; /* extra space for '%f' */
buff = luaL_prepbuffsize(&b, maxitem);
/* FALLTHROUGH */
case 'e': case 'E': case 'g': case 'G': {
lua_Number n = luaL_checknumber(L, arg);
addlenmod(form, LUA_NUMBER_FRMLEN);
nb = l_sprintf(buff, maxitem, form, (LUAI_UACNUMBER)n);
break;
}
case 'p': {
const void *p = lua_topointer(L, arg);
if (p == NULL) { /* avoid calling 'printf' with argument NULL */
p = "(null)"; /* result */
form[strlen(form) - 1] = 's'; /* format it as a string */
}
nb = l_sprintf(buff, maxitem, form, p);
break;
}
case 'q': {
if (form[2] != '\0') /* modifiers? */
return luaL_error(L, "specifier '%%q' cannot have modifiers");
addliteral(L, &b, arg);
break;
}
case 's': {
size_t l;
const char *s = luaL_tolstring(L, arg, &l);
if (form[2] == '\0') /* no modifiers? */
luaL_addvalue(&b); /* keep entire string */
else {
luaL_argcheck(L, l == strlen(s), arg, "string contains zeros");
if (!strchr(form, '.') && l >= 100) {
/* no precision and string is too long to be formatted */
luaL_addvalue(&b); /* keep entire string */
}
else { /* format the string into 'buff' */
nb = l_sprintf(buff, maxitem, form, s);
lua_pop(L, 1); /* remove result from 'luaL_tolstring' */
}
}
break;
}
default: { /* also treat cases 'pnLlh' */
return luaL_error(L, "invalid conversion '%s' to 'format'", form);
}
}
lua_assert(nb < maxitem);
luaL_addsize(&b, nb);
}
}
luaL_pushresult(&b);
return 1;
}
/* }====================================================== */
/*
** {======================================================
** PACK/UNPACK
** =======================================================
*/
/* value used for padding */
#if !defined(LUAL_PACKPADBYTE)
#define LUAL_PACKPADBYTE 0x00
#endif
/* maximum size for the binary representation of an integer */
#define MAXINTSIZE 16
/* number of bits in a character */
#define NB CHAR_BIT
/* mask for one character (NB 1's) */
#define MC ((1 << NB) - 1)
/* size of a lua_Integer */
#define SZINT ((int)sizeof(lua_Integer))
/* dummy union to get native endianness */
static const union {
int dummy;
char little; /* true iff machine is little endian */
} nativeendian = {1};
/* dummy structure to get native alignment requirements */
struct cD {
char c;
union { double d; void *p; lua_Integer i; lua_Number n; } u;
};
#define MAXALIGN (offsetof(struct cD, u))
/*
** Union for serializing floats
*/
typedef union Ftypes {
float f;
double d;
lua_Number n;
char buff[5 * sizeof(lua_Number)]; /* enough for any float type */
} Ftypes;
/*
** information to pack/unpack stuff
*/
typedef struct Header {
lua_State *L;
int islittle;
int maxalign;
} Header;
/*
** options for pack/unpack
*/
typedef enum KOption {
Kint, /* signed integers */
Kuint, /* unsigned integers */
Kfloat, /* floating-point numbers */
Kchar, /* fixed-length strings */
Kstring, /* strings with prefixed length */
Kzstr, /* zero-terminated strings */
Kpadding, /* padding */
Kpaddalign, /* padding for alignment */
Knop /* no-op (configuration or spaces) */
} KOption;
/*
** Read an integer numeral from string 'fmt' or return 'df' if
** there is no numeral
*/
static int digit (int c) { return '0' <= c && c <= '9'; }
static int getnum (const char **fmt, int df) {
if (!digit(**fmt)) /* no number? */
return df; /* return default value */
else {
int a = 0;
do {
a = a*10 + (*((*fmt)++) - '0');
} while (digit(**fmt) && a <= ((int)MAXSIZE - 9)/10);
return a;
}
}
/*
** Read an integer numeral and raises an error if it is larger
** than the maximum size for integers.
*/
static int getnumlimit (Header *h, const char **fmt, int df) {
int sz = getnum(fmt, df);
if (sz > MAXINTSIZE || sz <= 0)
return luaL_error(h->L, "integral size (%d) out of limits [1,%d]",
sz, MAXINTSIZE);
return sz;
}
/*
** Initialize Header
*/
static void initheader (lua_State *L, Header *h) {
h->L = L;
h->islittle = nativeendian.little;
h->maxalign = 1;
}
/*
** Read and classify next option. 'size' is filled with option's size.
*/
static KOption getoption (Header *h, const char **fmt, int *size) {
int opt = *((*fmt)++);
*size = 0; /* default */
switch (opt) {
case 'b': *size = sizeof(char); return Kint;
case 'B': *size = sizeof(char); return Kuint;
case 'h': *size = sizeof(short); return Kint;
case 'H': *size = sizeof(short); return Kuint;
case 'l': *size = sizeof(long); return Kint;
case 'L': *size = sizeof(long); return Kuint;
case 'j': *size = sizeof(lua_Integer); return Kint;
case 'J': *size = sizeof(lua_Integer); return Kuint;
case 'T': *size = sizeof(size_t); return Kuint;
case 'f': *size = sizeof(float); return Kfloat;
case 'd': *size = sizeof(double); return Kfloat;
case 'n': *size = sizeof(lua_Number); return Kfloat;
case 'i': *size = getnumlimit(h, fmt, sizeof(int)); return Kint;
case 'I': *size = getnumlimit(h, fmt, sizeof(int)); return Kuint;
case 's': *size = getnumlimit(h, fmt, sizeof(size_t)); return Kstring;
case 'c':
*size = getnum(fmt, -1);
if (*size == -1)
luaL_error(h->L, "missing size for format option 'c'");
return Kchar;
case 'z': return Kzstr;
case 'x': *size = 1; return Kpadding;
case 'X': return Kpaddalign;
case ' ': break;
case '<': h->islittle = 1; break;
case '>': h->islittle = 0; break;
case '=': h->islittle = nativeendian.little; break;
case '!': h->maxalign = getnumlimit(h, fmt, MAXALIGN); break;
default: luaL_error(h->L, "invalid format option '%c'", opt);
}
return Knop;
}
/*
** Read, classify, and fill other details about the next option.
** 'psize' is filled with option's size, 'notoalign' with its
** alignment requirements.
** Local variable 'size' gets the size to be aligned. (Kpadal option
** always gets its full alignment, other options are limited by
** the maximum alignment ('maxalign'). Kchar option needs no alignment
** despite its size.
*/
static KOption getdetails (Header *h, size_t totalsize,
const char **fmt, int *psize, int *ntoalign) {
KOption opt = getoption(h, fmt, psize);
int align = *psize; /* usually, alignment follows size */
if (opt == Kpaddalign) { /* 'X' gets alignment from following option */
if (**fmt == '\0' || getoption(h, fmt, &align) == Kchar || align == 0)
luaL_argerror(h->L, 1, "invalid next option for option 'X'");
}
if (align <= 1 || opt == Kchar) /* need no alignment? */
*ntoalign = 0;
else {
if (align > h->maxalign) /* enforce maximum alignment */
align = h->maxalign;
if ((align & (align - 1)) != 0) /* is 'align' not a power of 2? */
luaL_argerror(h->L, 1, "format asks for alignment not power of 2");
*ntoalign = (align - (int)(totalsize & (align - 1))) & (align - 1);
}
return opt;
}
/*
** Pack integer 'n' with 'size' bytes and 'islittle' endianness.
** The final 'if' handles the case when 'size' is larger than
** the size of a Lua integer, correcting the extra sign-extension
** bytes if necessary (by default they would be zeros).
*/
static void packint (luaL_Buffer *b, lua_Unsigned n,
int islittle, int size, int neg) {
char *buff = luaL_prepbuffsize(b, size);
int i;
buff[islittle ? 0 : size - 1] = (char)(n & MC); /* first byte */
for (i = 1; i < size; i++) {
n >>= NB;
buff[islittle ? i : size - 1 - i] = (char)(n & MC);
}
if (neg && size > SZINT) { /* negative number need sign extension? */
for (i = SZINT; i < size; i++) /* correct extra bytes */
buff[islittle ? i : size - 1 - i] = (char)MC;
}
luaL_addsize(b, size); /* add result to buffer */
}
/*
** Copy 'size' bytes from 'src' to 'dest', correcting endianness if
** given 'islittle' is different from native endianness.
*/
static void copywithendian (volatile char *dest, volatile const char *src,
int size, int islittle) {
if (islittle == nativeendian.little) {
while (size-- != 0)
*(dest++) = *(src++);
}
else {
dest += size - 1;
while (size-- != 0)
*(dest--) = *(src++);
}
}
static int str_pack (lua_State *L) {
luaL_Buffer b;
Header h;
const char *fmt = luaL_checkstring(L, 1); /* format string */
int arg = 1; /* current argument to pack */
size_t totalsize = 0; /* accumulate total size of result */
initheader(L, &h);
lua_pushnil(L); /* mark to separate arguments from string buffer */
luaL_buffinit(L, &b);
while (*fmt != '\0') {
int size, ntoalign;
KOption opt = getdetails(&h, totalsize, &fmt, &size, &ntoalign);
totalsize += ntoalign + size;
while (ntoalign-- > 0)
luaL_addchar(&b, LUAL_PACKPADBYTE); /* fill alignment */
arg++;
switch (opt) {
case Kint: { /* signed integers */
lua_Integer n = luaL_checkinteger(L, arg);
if (size < SZINT) { /* need overflow check? */
lua_Integer lim = (lua_Integer)1 << ((size * NB) - 1);
luaL_argcheck(L, -lim <= n && n < lim, arg, "integer overflow");
}
packint(&b, (lua_Unsigned)n, h.islittle, size, (n < 0));
break;
}
case Kuint: { /* unsigned integers */
lua_Integer n = luaL_checkinteger(L, arg);
if (size < SZINT) /* need overflow check? */
luaL_argcheck(L, (lua_Unsigned)n < ((lua_Unsigned)1 << (size * NB)),
arg, "unsigned overflow");
packint(&b, (lua_Unsigned)n, h.islittle, size, 0);
break;
}
case Kfloat: { /* floating-point options */
volatile Ftypes u;
char *buff = luaL_prepbuffsize(&b, size);
lua_Number n = luaL_checknumber(L, arg); /* get argument */
if (size == sizeof(u.f)) u.f = (float)n; /* copy it into 'u' */
else if (size == sizeof(u.d)) u.d = (double)n;
else u.n = n;
/* move 'u' to final result, correcting endianness if needed */
copywithendian(buff, u.buff, size, h.islittle);
luaL_addsize(&b, size);
break;
}
case Kchar: { /* fixed-size string */
size_t len;
const char *s = luaL_checklstring(L, arg, &len);
luaL_argcheck(L, len <= (size_t)size, arg,
"string longer than given size");
luaL_addlstring(&b, s, len); /* add string */
while (len++ < (size_t)size) /* pad extra space */
luaL_addchar(&b, LUAL_PACKPADBYTE);
break;
}
case Kstring: { /* strings with length count */
size_t len;
const char *s = luaL_checklstring(L, arg, &len);
luaL_argcheck(L, size >= (int)sizeof(size_t) ||
len < ((size_t)1 << (size * NB)),
arg, "string length does not fit in given size");
packint(&b, (lua_Unsigned)len, h.islittle, size, 0); /* pack length */
luaL_addlstring(&b, s, len);
totalsize += len;
break;
}
case Kzstr: { /* zero-terminated string */
size_t len;
const char *s = luaL_checklstring(L, arg, &len);
luaL_argcheck(L, strlen(s) == len, arg, "string contains zeros");
luaL_addlstring(&b, s, len);
luaL_addchar(&b, '\0'); /* add zero at the end */
totalsize += len + 1;
break;
}
case Kpadding: luaL_addchar(&b, LUAL_PACKPADBYTE); /* FALLTHROUGH */
case Kpaddalign: case Knop:
arg--; /* undo increment */
break;
}
}
luaL_pushresult(&b);
return 1;
}
static int str_packsize (lua_State *L) {
Header h;
const char *fmt = luaL_checkstring(L, 1); /* format string */
size_t totalsize = 0; /* accumulate total size of result */
initheader(L, &h);
while (*fmt != '\0') {
int size, ntoalign;
KOption opt = getdetails(&h, totalsize, &fmt, &size, &ntoalign);
luaL_argcheck(L, opt != Kstring && opt != Kzstr, 1,
"variable-length format");
size += ntoalign; /* total space used by option */
luaL_argcheck(L, totalsize <= MAXSIZE - size, 1,
"format result too large");
totalsize += size;
}
lua_pushinteger(L, (lua_Integer)totalsize);
return 1;
}
/*
** Unpack an integer with 'size' bytes and 'islittle' endianness.
** If size is smaller than the size of a Lua integer and integer
** is signed, must do sign extension (propagating the sign to the
** higher bits); if size is larger than the size of a Lua integer,
** it must check the unread bytes to see whether they do not cause an
** overflow.
*/
static lua_Integer unpackint (lua_State *L, const char *str,
int islittle, int size, int issigned) {
lua_Unsigned res = 0;
int i;
int limit = (size <= SZINT) ? size : SZINT;
for (i = limit - 1; i >= 0; i--) {
res <<= NB;
res |= (lua_Unsigned)(unsigned char)str[islittle ? i : size - 1 - i];
}
if (size < SZINT) { /* real size smaller than lua_Integer? */
if (issigned) { /* needs sign extension? */
lua_Unsigned mask = (lua_Unsigned)1 << (size*NB - 1);
res = ((res ^ mask) - mask); /* do sign extension */
}
}
else if (size > SZINT) { /* must check unread bytes */
int mask = (!issigned || (lua_Integer)res >= 0) ? 0 : MC;
for (i = limit; i < size; i++) {
if ((unsigned char)str[islittle ? i : size - 1 - i] != mask)
luaL_error(L, "%d-byte integer does not fit into Lua Integer", size);
}
}
return (lua_Integer)res;
}
static int str_unpack (lua_State *L) {
Header h;
const char *fmt = luaL_checkstring(L, 1);
size_t ld;
const char *data = luaL_checklstring(L, 2, &ld);
size_t pos = posrelatI(luaL_optinteger(L, 3, 1), ld) - 1;
int n = 0; /* number of results */
luaL_argcheck(L, pos <= ld, 3, "initial position out of string");
initheader(L, &h);
while (*fmt != '\0') {
int size, ntoalign;
KOption opt = getdetails(&h, pos, &fmt, &size, &ntoalign);
luaL_argcheck(L, (size_t)ntoalign + size <= ld - pos, 2,
"data string too short");
pos += ntoalign; /* skip alignment */
/* stack space for item + next position */
luaL_checkstack(L, 2, "too many results");
n++;
switch (opt) {
case Kint:
case Kuint: {
lua_Integer res = unpackint(L, data + pos, h.islittle, size,
(opt == Kint));
lua_pushinteger(L, res);
break;
}
case Kfloat: {
volatile Ftypes u;
lua_Number num;
copywithendian(u.buff, data + pos, size, h.islittle);
if (size == sizeof(u.f)) num = (lua_Number)u.f;
else if (size == sizeof(u.d)) num = (lua_Number)u.d;
else num = u.n;
lua_pushnumber(L, num);
break;
}
case Kchar: {
lua_pushlstring(L, data + pos, size);
break;
}
case Kstring: {
size_t len = (size_t)unpackint(L, data + pos, h.islittle, size, 0);
luaL_argcheck(L, len <= ld - pos - size, 2, "data string too short");
lua_pushlstring(L, data + pos + size, len);
pos += len; /* skip string */
break;
}
case Kzstr: {
size_t len = (int)strlen(data + pos);
luaL_argcheck(L, pos + len < ld, 2,
"unfinished string for format 'z'");
lua_pushlstring(L, data + pos, len);
pos += len + 1; /* skip string plus final '\0' */
break;
}
case Kpaddalign: case Kpadding: case Knop:
n--; /* undo increment */
break;
}
pos += size;
}
lua_pushinteger(L, pos + 1); /* next position */
return n + 1;
}
/* }====================================================== */
static const luaL_Reg strlib[] = {
{"byte", str_byte},
{"char", str_char},
{"dump", str_dump},
{"find", str_find},
{"format", str_format},
{"gmatch", gmatch},
{"gsub", str_gsub},
{"len", str_len},
{"lower", str_lower},
{"match", str_match},
{"rep", str_rep},
{"reverse", str_reverse},
{"sub", str_sub},
{"upper", str_upper},
{"pack", str_pack},
{"packsize", str_packsize},
{"unpack", str_unpack},
{NULL, NULL}
};
static void createmetatable (lua_State *L) {
/* table to be metatable for strings */
luaL_newlibtable(L, stringmetamethods);
luaL_setfuncs(L, stringmetamethods, 0);
lua_pushliteral(L, ""); /* dummy string */
lua_pushvalue(L, -2); /* copy table */
lua_setmetatable(L, -2); /* set table as metatable for strings */
lua_pop(L, 1); /* pop dummy string */
lua_pushvalue(L, -2); /* get string library */
lua_setfield(L, -2, "__index"); /* metatable.__index = string */
lua_pop(L, 1); /* pop metatable */
}
/*
** Open string library
*/
LUAMOD_API int luaopen_string (lua_State *L) {
luaL_newlib(L, strlib);
createmetatable(L);
return 1;
}
LTABLE¶
/*
** $Id: ltable.h $
** Lua tables (hash)
** See Copyright Notice in lua.h
*/
#ifndef ltable_h
#define ltable_h
#include "lobject.h"
#include "_native_lua_config.h" /* native Lua */
#define gnode(t,i) (&(t)->node[i])
#define gval(n) (&(n)->i_val)
#define gnext(n) ((n)->u.next)
#define invalidateTMcache(t) ((t)->flags = 0)
/* true when 't' is using 'dummynode' as its hash part */
#define isdummy(t) ((t)->lastfree == NULL)
/* allocated size for hash nodes */
#define allocsizenode(t) (isdummy(t) ? 0 : sizenode(t))
/* returns the Node, given the value of a table entry */
#define nodefromval(v) cast(Node *, (v))
LUAI_FUNC const TValue *luaH_getint (Table *t, lua_Integer key);
LUAI_FUNC void luaH_setint (lua_State *L, Table *t, lua_Integer key,
TValue *value);
LUAI_FUNC const TValue *luaH_getshortstr (Table *t, TString *key);
LUAI_FUNC const TValue *luaH_getstr (Table *t, TString *key);
LUAI_FUNC const TValue *luaH_get (Table *t, const TValue *key);
LUAI_FUNC TValue *luaH_newkey (lua_State *L, Table *t, const TValue *key);
LUAI_FUNC TValue *luaH_set (lua_State *L, Table *t, const TValue *key);
LUAI_FUNC Table *luaH_new (lua_State *L);
LUAI_FUNC void luaH_resize (lua_State *L, Table *t, unsigned int nasize,
unsigned int nhsize);
LUAI_FUNC void luaH_resizearray (lua_State *L, Table *t, unsigned int nasize);
LUAI_FUNC void luaH_free (lua_State *L, Table *t);
LUAI_FUNC int luaH_next (lua_State *L, Table *t, StkId key);
LUAI_FUNC lua_Unsigned luaH_getn (Table *t);
LUAI_FUNC unsigned int luaH_realasize (const Table *t);
#if defined(LUA_DEBUG)
LUAI_FUNC Node *luaH_mainposition (const Table *t, const TValue *key);
LUAI_FUNC int luaH_isdummy (const Table *t);
#endif
#endif
/*
** $Id: ltable.c $
** Lua tables (hash)
** See Copyright Notice in lua.h
*/
#define ltable_c
#define LUA_CORE
#include "lprefix.h"
/*
** Implementation of tables (aka arrays, objects, or hash tables).
** Tables keep its elements in two parts: an array part and a hash part.
** Non-negative integer keys are all candidates to be kept in the array
** part. The actual size of the array is the largest 'n' such that
** more than half the slots between 1 and n are in use.
** Hash uses a mix of chained scatter table with Brent's variation.
** A main invariant of these tables is that, if an element is not
** in its main position (i.e. the 'original' position that its hash gives
** to it), then the colliding element is in its own main position.
** Hence even when the load factor reaches 100%, performance remains good.
*/
#include <math.h>
#include <limits.h>
#include "lua.h"
#include "ldebug.h"
#include "ldo.h"
#include "lgc.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "lvm.h"
/*
** MAXABITS is the largest integer such that MAXASIZE fits in an
** unsigned int.
*/
#define MAXABITS cast_int(sizeof(int) * CHAR_BIT - 1)
/*
** MAXASIZE is the maximum size of the array part. It is the minimum
** between 2^MAXABITS and the maximum size that, measured in bytes,
** fits in a 'size_t'.
*/
#define MAXASIZE luaM_limitN(1u << MAXABITS, TValue)
/*
** MAXHBITS is the largest integer such that 2^MAXHBITS fits in a
** signed int.
*/
#define MAXHBITS (MAXABITS - 1)
/*
** MAXHSIZE is the maximum size of the hash part. It is the minimum
** between 2^MAXHBITS and the maximum size such that, measured in bytes,
** it fits in a 'size_t'.
*/
#define MAXHSIZE luaM_limitN(1u << MAXHBITS, Node)
#define hashpow2(t,n) (gnode(t, lmod((n), sizenode(t))))
#define hashstr(t,str) hashpow2(t, (str)->hash)
#define hashboolean(t,p) hashpow2(t, p)
#define hashint(t,i) hashpow2(t, i)
/*
** for some types, it is better to avoid modulus by power of 2, as
** they tend to have many 2 factors.
*/
#define hashmod(t,n) (gnode(t, ((n) % ((sizenode(t)-1)|1))))
#define hashpointer(t,p) hashmod(t, point2uint(p))
#define dummynode (&dummynode_)
static const Node dummynode_ = {
{{NULL}, LUA_VEMPTY, /* value's value and type */
LUA_VNIL, 0, {NULL}} /* key type, next, and key value */
};
static const TValue absentkey = {ABSTKEYCONSTANT};
/*
** Hash for floating-point numbers.
** The main computation should be just
** n = frexp(n, &i); return (n * INT_MAX) + i
** but there are some numerical subtleties.
** In a two-complement representation, INT_MAX does not has an exact
** representation as a float, but INT_MIN does; because the absolute
** value of 'frexp' is smaller than 1 (unless 'n' is inf/NaN), the
** absolute value of the product 'frexp * -INT_MIN' is smaller or equal
** to INT_MAX. Next, the use of 'unsigned int' avoids overflows when
** adding 'i'; the use of '~u' (instead of '-u') avoids problems with
** INT_MIN.
*/
#if !defined(l_hashfloat)
static int l_hashfloat (lua_Number n) {
int i;
lua_Integer ni;
n = l_mathop(frexp)(n, &i) * -cast_num(INT_MIN);
if (!lua_numbertointeger(n, &ni)) { /* is 'n' inf/-inf/NaN? */
lua_assert(luai_numisnan(n) || l_mathop(fabs)(n) == cast_num(HUGE_VAL));
return 0;
}
else { /* normal case */
unsigned int u = cast_uint(i) + cast_uint(ni);
return cast_int(u <= cast_uint(INT_MAX) ? u : ~u);
}
}
#endif
/*
** returns the 'main' position of an element in a table (that is,
** the index of its hash value). The key comes broken (tag in 'ktt'
** and value in 'vkl') so that we can call it on keys inserted into
** nodes.
*/
static Node *mainposition (const Table *t, int ktt, const Value *kvl) {
switch (withvariant(ktt)) {
case LUA_VNUMINT:
return hashint(t, ivalueraw(*kvl));
case LUA_VNUMFLT:
return hashmod(t, l_hashfloat(fltvalueraw(*kvl)));
case LUA_VSHRSTR:
return hashstr(t, tsvalueraw(*kvl));
case LUA_VLNGSTR:
return hashpow2(t, luaS_hashlongstr(tsvalueraw(*kvl)));
case LUA_VFALSE:
return hashboolean(t, 0);
case LUA_VTRUE:
return hashboolean(t, 1);
case LUA_VLIGHTUSERDATA:
return hashpointer(t, pvalueraw(*kvl));
case LUA_VLCF:
return hashpointer(t, fvalueraw(*kvl));
default:
return hashpointer(t, gcvalueraw(*kvl));
}
}
/*
** Returns the main position of an element given as a 'TValue'
*/
static Node *mainpositionTV (const Table *t, const TValue *key) {
return mainposition(t, rawtt(key), valraw(key));
}
/*
** Check whether key 'k1' is equal to the key in node 'n2'.
** This equality is raw, so there are no metamethods. Floats
** with integer values have been normalized, so integers cannot
** be equal to floats. It is assumed that 'eqshrstr' is simply
** pointer equality, so that short strings are handled in the
** default case.
*/
static int equalkey (const TValue *k1, const Node *n2) {
if (rawtt(k1) != keytt(n2)) /* not the same variants? */
return 0; /* cannot be same key */
switch (ttypetag(k1)) {
case LUA_VNIL: case LUA_VFALSE: case LUA_VTRUE:
return 1;
case LUA_VNUMINT:
return (ivalue(k1) == keyival(n2));
case LUA_VNUMFLT:
return luai_numeq(fltvalue(k1), fltvalueraw(keyval(n2)));
case LUA_VLIGHTUSERDATA:
return pvalue(k1) == pvalueraw(keyval(n2));
case LUA_VLCF:
return fvalue(k1) == fvalueraw(keyval(n2));
case LUA_VLNGSTR:
return luaS_eqlngstr(tsvalue(k1), keystrval(n2));
default:
return gcvalue(k1) == gcvalueraw(keyval(n2));
}
}
/*
** True if value of 'alimit' is equal to the real size of the array
** part of table 't'. (Otherwise, the array part must be larger than
** 'alimit'.)
*/
#define limitequalsasize(t) (isrealasize(t) || ispow2((t)->alimit))
/*
** Returns the real size of the 'array' array
*/
LUAI_FUNC unsigned int luaH_realasize (const Table *t) {
if (limitequalsasize(t))
return t->alimit; /* this is the size */
else {
unsigned int size = t->alimit;
/* compute the smallest power of 2 not smaller than 'n' */
size |= (size >> 1);
size |= (size >> 2);
size |= (size >> 4);
size |= (size >> 8);
size |= (size >> 16);
#if (UINT_MAX >> 30) > 3
size |= (size >> 32); /* unsigned int has more than 32 bits */
#endif
size++;
lua_assert(ispow2(size) && size/2 < t->alimit && t->alimit < size);
return size;
}
}
/*
** Check whether real size of the array is a power of 2.
** (If it is not, 'alimit' cannot be changed to any other value
** without changing the real size.)
*/
static int ispow2realasize (const Table *t) {
return (!isrealasize(t) || ispow2(t->alimit));
}
static unsigned int setlimittosize (Table *t) {
t->alimit = luaH_realasize(t);
setrealasize(t);
return t->alimit;
}
#define limitasasize(t) check_exp(isrealasize(t), t->alimit)
/*
** "Generic" get version. (Not that generic: not valid for integers,
** which may be in array part, nor for floats with integral values.)
*/
static const TValue *getgeneric (Table *t, const TValue *key) {
Node *n = mainpositionTV(t, key);
for (;;) { /* check whether 'key' is somewhere in the chain */
if (equalkey(key, n))
return gval(n); /* that's it */
else {
int nx = gnext(n);
if (nx == 0)
return &absentkey; /* not found */
n += nx;
}
}
}
/*
** returns the index for 'k' if 'k' is an appropriate key to live in
** the array part of a table, 0 otherwise.
*/
static unsigned int arrayindex (lua_Integer k) {
if (l_castS2U(k) - 1u < MAXASIZE) /* 'k' in [1, MAXASIZE]? */
return cast_uint(k); /* 'key' is an appropriate array index */
else
return 0;
}
/*
** returns the index of a 'key' for table traversals. First goes all
** elements in the array part, then elements in the hash part. The
** beginning of a traversal is signaled by 0.
*/
static unsigned int findindex (lua_State *L, Table *t, TValue *key,
unsigned int asize) {
unsigned int i;
if (ttisnil(key)) return 0; /* first iteration */
i = ttisinteger(key) ? arrayindex(ivalue(key)) : 0;
if (i - 1u < asize) /* is 'key' inside array part? */
return i; /* yes; that's the index */
else {
const TValue *n = getgeneric(t, key);
if (unlikely(isabstkey(n)))
luaG_runerror(L, "invalid key to 'next'"); /* key not found */
i = cast_int(nodefromval(n) - gnode(t, 0)); /* key index in hash table */
/* hash elements are numbered after array ones */
return (i + 1) + asize;
}
}
int luaH_next (lua_State *L, Table *t, StkId key) {
unsigned int asize = luaH_realasize(t);
unsigned int i = findindex(L, t, s2v(key), asize); /* find original key */
for (; i < asize; i++) { /* try first array part */
if (!isempty(&t->array[i])) { /* a non-empty entry? */
setivalue(s2v(key), i + 1);
setobj2s(L, key + 1, &t->array[i]);
return 1;
}
}
for (i -= asize; cast_int(i) < sizenode(t); i++) { /* hash part */
if (!isempty(gval(gnode(t, i)))) { /* a non-empty entry? */
Node *n = gnode(t, i);
getnodekey(L, s2v(key), n);
setobj2s(L, key + 1, gval(n));
return 1;
}
}
return 0; /* no more elements */
}
static void freehash (lua_State *L, Table *t) {
if (!isdummy(t))
luaM_freearray(L, t->node, cast_sizet(sizenode(t)));
}
/*
** {=============================================================
** Rehash
** ==============================================================
*/
/*
** Compute the optimal size for the array part of table 't'. 'nums' is a
** "count array" where 'nums[i]' is the number of integers in the table
** between 2^(i - 1) + 1 and 2^i. 'pna' enters with the total number of
** integer keys in the table and leaves with the number of keys that
** will go to the array part; return the optimal size. (The condition
** 'twotoi > 0' in the for loop stops the loop if 'twotoi' overflows.)
*/
static unsigned int computesizes (unsigned int nums[], unsigned int *pna) {
int i;
unsigned int twotoi; /* 2^i (candidate for optimal size) */
unsigned int a = 0; /* number of elements smaller than 2^i */
unsigned int na = 0; /* number of elements to go to array part */
unsigned int optimal = 0; /* optimal size for array part */
/* loop while keys can fill more than half of total size */
for (i = 0, twotoi = 1;
twotoi > 0 && *pna > twotoi / 2;
i++, twotoi *= 2) {
a += nums[i];
if (a > twotoi/2) { /* more than half elements present? */
optimal = twotoi; /* optimal size (till now) */
na = a; /* all elements up to 'optimal' will go to array part */
}
}
lua_assert((optimal == 0 || optimal / 2 < na) && na <= optimal);
*pna = na;
return optimal;
}
static int countint (lua_Integer key, unsigned int *nums) {
unsigned int k = arrayindex(key);
if (k != 0) { /* is 'key' an appropriate array index? */
nums[luaO_ceillog2(k)]++; /* count as such */
return 1;
}
else
return 0;
}
/*
** Count keys in array part of table 't': Fill 'nums[i]' with
** number of keys that will go into corresponding slice and return
** total number of non-nil keys.
*/
static unsigned int numusearray (const Table *t, unsigned int *nums) {
int lg;
unsigned int ttlg; /* 2^lg */
unsigned int ause = 0; /* summation of 'nums' */
unsigned int i = 1; /* count to traverse all array keys */
unsigned int asize = limitasasize(t); /* real array size */
/* traverse each slice */
for (lg = 0, ttlg = 1; lg <= MAXABITS; lg++, ttlg *= 2) {
unsigned int lc = 0; /* counter */
unsigned int lim = ttlg;
if (lim > asize) {
lim = asize; /* adjust upper limit */
if (i > lim)
break; /* no more elements to count */
}
/* count elements in range (2^(lg - 1), 2^lg] */
for (; i <= lim; i++) {
if (!isempty(&t->array[i-1]))
lc++;
}
nums[lg] += lc;
ause += lc;
}
return ause;
}
static int numusehash (const Table *t, unsigned int *nums, unsigned int *pna) {
int totaluse = 0; /* total number of elements */
int ause = 0; /* elements added to 'nums' (can go to array part) */
int i = sizenode(t);
while (i--) {
Node *n = &t->node[i];
if (!isempty(gval(n))) {
if (keyisinteger(n))
ause += countint(keyival(n), nums);
totaluse++;
}
}
*pna += ause;
return totaluse;
}
/*
** Creates an array for the hash part of a table with the given
** size, or reuses the dummy node if size is zero.
** The computation for size overflow is in two steps: the first
** comparison ensures that the shift in the second one does not
** overflow.
*/
static void setnodevector (lua_State *L, Table *t, unsigned int size) {
if (size == 0) { /* no elements to hash part? */
t->node = cast(Node *, dummynode); /* use common 'dummynode' */
t->lsizenode = 0;
t->lastfree = NULL; /* signal that it is using dummy node */
}
else {
int i;
int lsize = luaO_ceillog2(size);
if (lsize > MAXHBITS || (1u << lsize) > MAXHSIZE)
luaG_runerror(L, "table overflow");
size = twoto(lsize);
t->node = luaM_newvector(L, size, Node);
for (i = 0; i < (int)size; i++) {
Node *n = gnode(t, i);
gnext(n) = 0;
setnilkey(n);
setempty(gval(n));
}
t->lsizenode = cast_byte(lsize);
t->lastfree = gnode(t, size); /* all positions are free */
}
}
/*
** (Re)insert all elements from the hash part of 'ot' into table 't'.
*/
static void reinsert (lua_State *L, Table *ot, Table *t) {
int j;
int size = sizenode(ot);
for (j = 0; j < size; j++) {
Node *old = gnode(ot, j);
if (!isempty(gval(old))) {
/* doesn't need barrier/invalidate cache, as entry was
already present in the table */
TValue k;
getnodekey(L, &k, old);
setobjt2t(L, luaH_set(L, t, &k), gval(old));
}
}
}
/*
** Exchange the hash part of 't1' and 't2'.
*/
static void exchangehashpart (Table *t1, Table *t2) {
lu_byte lsizenode = t1->lsizenode;
Node *node = t1->node;
Node *lastfree = t1->lastfree;
t1->lsizenode = t2->lsizenode;
t1->node = t2->node;
t1->lastfree = t2->lastfree;
t2->lsizenode = lsizenode;
t2->node = node;
t2->lastfree = lastfree;
}
/*
** Resize table 't' for the new given sizes. Both allocations (for
** the hash part and for the array part) can fail, which creates some
** subtleties. If the first allocation, for the hash part, fails, an
** error is raised and that is it. Otherwise, it copies the elements from
** the shrinking part of the array (if it is shrinking) into the new
** hash. Then it reallocates the array part. If that fails, the table
** is in its original state; the function frees the new hash part and then
** raises the allocation error. Otherwise, it sets the new hash part
** into the table, initializes the new part of the array (if any) with
** nils and reinserts the elements of the old hash back into the new
** parts of the table.
*/
void luaH_resize (lua_State *L, Table *t, unsigned int newasize,
unsigned int nhsize) {
unsigned int i;
Table newt; /* to keep the new hash part */
unsigned int oldasize = setlimittosize(t);
TValue *newarray;
/* create new hash part with appropriate size into 'newt' */
setnodevector(L, &newt, nhsize);
if (newasize < oldasize) { /* will array shrink? */
t->alimit = newasize; /* pretend array has new size... */
exchangehashpart(t, &newt); /* and new hash */
/* re-insert into the new hash the elements from vanishing slice */
for (i = newasize; i < oldasize; i++) {
if (!isempty(&t->array[i]))
luaH_setint(L, t, i + 1, &t->array[i]);
}
t->alimit = oldasize; /* restore current size... */
exchangehashpart(t, &newt); /* and hash (in case of errors) */
}
/* allocate new array */
newarray = luaM_reallocvector(L, t->array, oldasize, newasize, TValue);
if (unlikely(newarray == NULL && newasize > 0)) { /* allocation failed? */
freehash(L, &newt); /* release new hash part */
luaM_error(L); /* raise error (with array unchanged) */
}
/* allocation ok; initialize new part of the array */
exchangehashpart(t, &newt); /* 't' has the new hash ('newt' has the old) */
t->array = newarray; /* set new array part */
t->alimit = newasize;
for (i = oldasize; i < newasize; i++) /* clear new slice of the array */
setempty(&t->array[i]);
/* re-insert elements from old hash part into new parts */
reinsert(L, &newt, t); /* 'newt' now has the old hash */
freehash(L, &newt); /* free old hash part */
}
void luaH_resizearray (lua_State *L, Table *t, unsigned int nasize) {
int nsize = allocsizenode(t);
luaH_resize(L, t, nasize, nsize);
}
/*
** nums[i] = number of keys 'k' where 2^(i - 1) < k <= 2^i
*/
static void rehash (lua_State *L, Table *t, const TValue *ek) {
unsigned int asize; /* optimal size for array part */
unsigned int na; /* number of keys in the array part */
unsigned int nums[MAXABITS + 1];
int i;
int totaluse;
for (i = 0; i <= MAXABITS; i++) nums[i] = 0; /* reset counts */
setlimittosize(t);
na = numusearray(t, nums); /* count keys in array part */
totaluse = na; /* all those keys are integer keys */
totaluse += numusehash(t, nums, &na); /* count keys in hash part */
/* count extra key */
if (ttisinteger(ek))
na += countint(ivalue(ek), nums);
totaluse++;
/* compute new size for array part */
asize = computesizes(nums, &na);
/* resize the table to new computed sizes */
luaH_resize(L, t, asize, totaluse - na);
}
/*
** }=============================================================
*/
Table *luaH_new (lua_State *L) {
GCObject *o = luaC_newobj(L, LUA_VTABLE, sizeof(Table));
Table *t = gco2t(o);
t->metatable = NULL;
t->flags = cast_byte(~0);
t->array = NULL;
t->alimit = 0;
setnodevector(L, t, 0);
return t;
}
void luaH_free (lua_State *L, Table *t) {
freehash(L, t);
luaM_freearray(L, t->array, luaH_realasize(t));
luaM_free(L, t);
}
static Node *getfreepos (Table *t) {
if (!isdummy(t)) {
while (t->lastfree > t->node) {
t->lastfree--;
if (keyisnil(t->lastfree))
return t->lastfree;
}
}
return NULL; /* could not find a free place */
}
/*
** inserts a new key into a hash table; first, check whether key's main
** position is free. If not, check whether colliding node is in its main
** position or not: if it is not, move colliding node to an empty place and
** put new key in its main position; otherwise (colliding node is in its main
** position), new key goes to an empty position.
*/
TValue *luaH_newkey (lua_State *L, Table *t, const TValue *key) {
Node *mp;
TValue aux;
if (unlikely(ttisnil(key)))
luaG_runerror(L, "table index is nil");
else if (ttisfloat(key)) {
lua_Number f = fltvalue(key);
lua_Integer k;
if (luaV_flttointeger(f, &k, F2Ieq)) { /* does key fit in an integer? */
setivalue(&aux, k);
key = &aux; /* insert it as an integer */
}
else if (unlikely(luai_numisnan(f)))
luaG_runerror(L, "table index is NaN");
}
mp = mainpositionTV(t, key);
if (!isempty(gval(mp)) || isdummy(t)) { /* main position is taken? */
Node *othern;
Node *f = getfreepos(t); /* get a free place */
if (f == NULL) { /* cannot find a free place? */
rehash(L, t, key); /* grow table */
/* whatever called 'newkey' takes care of TM cache */
return luaH_set(L, t, key); /* insert key into grown table */
}
lua_assert(!isdummy(t));
othern = mainposition(t, keytt(mp), &keyval(mp));
if (othern != mp) { /* is colliding node out of its main position? */
/* yes; move colliding node into free position */
while (othern + gnext(othern) != mp) /* find previous */
othern += gnext(othern);
gnext(othern) = cast_int(f - othern); /* rechain to point to 'f' */
*f = *mp; /* copy colliding node into free pos. (mp->next also goes) */
if (gnext(mp) != 0) {
gnext(f) += cast_int(mp - f); /* correct 'next' */
gnext(mp) = 0; /* now 'mp' is free */
}
setempty(gval(mp));
}
else { /* colliding node is in its own main position */
/* new node will go into free position */
if (gnext(mp) != 0)
gnext(f) = cast_int((mp + gnext(mp)) - f); /* chain new position */
else lua_assert(gnext(f) == 0);
gnext(mp) = cast_int(f - mp);
mp = f;
}
}
setnodekey(L, mp, key);
luaC_barrierback(L, obj2gco(t), key);
lua_assert(isempty(gval(mp)));
return gval(mp);
}
/*
** Search function for integers. If integer is inside 'alimit', get it
** directly from the array part. Otherwise, if 'alimit' is not equal to
** the real size of the array, key still can be in the array part. In
** this case, try to avoid a call to 'luaH_realasize' when key is just
** one more than the limit (so that it can be incremented without
** changing the real size of the array).
*/
const TValue *luaH_getint (Table *t, lua_Integer key) {
if (l_castS2U(key) - 1u < t->alimit) /* 'key' in [1, t->alimit]? */
return &t->array[key - 1];
else if (!limitequalsasize(t) && /* key still may be in the array part? */
(l_castS2U(key) == t->alimit + 1 ||
l_castS2U(key) - 1u < luaH_realasize(t))) {
t->alimit = cast_uint(key); /* probably '#t' is here now */
return &t->array[key - 1];
}
else {
Node *n = hashint(t, key);
for (;;) { /* check whether 'key' is somewhere in the chain */
if (keyisinteger(n) && keyival(n) == key)
return gval(n); /* that's it */
else {
int nx = gnext(n);
if (nx == 0) break;
n += nx;
}
}
return &absentkey;
}
}
/*
** search function for short strings
*/
const TValue *luaH_getshortstr (Table *t, TString *key) {
Node *n = hashstr(t, key);
lua_assert(key->tt == LUA_VSHRSTR);
for (;;) { /* check whether 'key' is somewhere in the chain */
if (keyisshrstr(n) && eqshrstr(keystrval(n), key))
return gval(n); /* that's it */
else {
int nx = gnext(n);
if (nx == 0)
return &absentkey; /* not found */
n += nx;
}
}
}
const TValue *luaH_getstr (Table *t, TString *key) {
if (key->tt == LUA_VSHRSTR)
return luaH_getshortstr(t, key);
else { /* for long strings, use generic case */
TValue ko;
setsvalue(cast(lua_State *, NULL), &ko, key);
return getgeneric(t, &ko);
}
}
/*
** main search function
*/
const TValue *luaH_get (Table *t, const TValue *key) {
switch (ttypetag(key)) {
case LUA_VSHRSTR: return luaH_getshortstr(t, tsvalue(key));
case LUA_VNUMINT: return luaH_getint(t, ivalue(key));
case LUA_VNIL: return &absentkey;
case LUA_VNUMFLT: {
lua_Integer k;
if (luaV_flttointeger(fltvalue(key), &k, F2Ieq)) /* integral index? */
return luaH_getint(t, k); /* use specialized version */
/* else... */
} /* FALLTHROUGH */
default:
return getgeneric(t, key);
}
}
/*
** beware: when using this function you probably need to check a GC
** barrier and invalidate the TM cache.
*/
TValue *luaH_set (lua_State *L, Table *t, const TValue *key) {
const TValue *p = luaH_get(t, key);
if (!isabstkey(p))
return cast(TValue *, p);
else return luaH_newkey(L, t, key);
}
void luaH_setint (lua_State *L, Table *t, lua_Integer key, TValue *value) {
const TValue *p = luaH_getint(t, key);
TValue *cell;
if (!isabstkey(p))
cell = cast(TValue *, p);
else {
TValue k;
setivalue(&k, key);
cell = luaH_newkey(L, t, &k);
}
setobj2t(L, cell, value);
}
/*
** Try to find a boundary in the hash part of table 't'. From the
** caller, we know that 'j' is zero or present and that 'j + 1' is
** present. We want to find a larger key that is absent from the
** table, so that we can do a binary search between the two keys to
** find a boundary. We keep doubling 'j' until we get an absent index.
** If the doubling would overflow, we try LUA_MAXINTEGER. If it is
** absent, we are ready for the binary search. ('j', being max integer,
** is larger or equal to 'i', but it cannot be equal because it is
** absent while 'i' is present; so 'j > i'.) Otherwise, 'j' is a
** boundary. ('j + 1' cannot be a present integer key because it is
** not a valid integer in Lua.)
*/
static lua_Unsigned hash_search (Table *t, lua_Unsigned j) {
lua_Unsigned i;
if (j == 0) j++; /* the caller ensures 'j + 1' is present */
do {
i = j; /* 'i' is a present index */
if (j <= l_castS2U(LUA_MAXINTEGER) / 2)
j *= 2;
else {
j = LUA_MAXINTEGER;
if (isempty(luaH_getint(t, j))) /* t[j] not present? */
break; /* 'j' now is an absent index */
else /* weird case */
return j; /* well, max integer is a boundary... */
}
} while (!isempty(luaH_getint(t, j))); /* repeat until an absent t[j] */
/* i < j && t[i] present && t[j] absent */
while (j - i > 1u) { /* do a binary search between them */
lua_Unsigned m = (i + j) / 2;
if (isempty(luaH_getint(t, m))) j = m;
else i = m;
}
return i;
}
static unsigned int binsearch (const TValue *array, unsigned int i,
unsigned int j) {
while (j - i > 1u) { /* binary search */
unsigned int m = (i + j) / 2;
if (isempty(&array[m - 1])) j = m;
else i = m;
}
return i;
}
/*
** Try to find a boundary in table 't'. (A 'boundary' is an integer index
** such that t[i] is present and t[i+1] is absent, or 0 if t[1] is absent
** and 'maxinteger' if t[maxinteger] is present.)
** (In the next explanation, we use Lua indices, that is, with base 1.
** The code itself uses base 0 when indexing the array part of the table.)
** The code starts with 'limit = t->alimit', a position in the array
** part that may be a boundary.
**
** (1) If 't[limit]' is empty, there must be a boundary before it.
** As a common case (e.g., after 't[#t]=nil'), check whether 'limit-1'
** is present. If so, it is a boundary. Otherwise, do a binary search
** between 0 and limit to find a boundary. In both cases, try to
** use this boundary as the new 'alimit', as a hint for the next call.
**
** (2) If 't[limit]' is not empty and the array has more elements
** after 'limit', try to find a boundary there. Again, try first
** the special case (which should be quite frequent) where 'limit+1'
** is empty, so that 'limit' is a boundary. Otherwise, check the
** last element of the array part. If it is empty, there must be a
** boundary between the old limit (present) and the last element
** (absent), which is found with a binary search. (This boundary always
** can be a new limit.)
**
** (3) The last case is when there are no elements in the array part
** (limit == 0) or its last element (the new limit) is present.
** In this case, must check the hash part. If there is no hash part
** or 'limit+1' is absent, 'limit' is a boundary. Otherwise, call
** 'hash_search' to find a boundary in the hash part of the table.
** (In those cases, the boundary is not inside the array part, and
** therefore cannot be used as a new limit.)
*/
lua_Unsigned luaH_getn (Table *t) {
unsigned int limit = t->alimit;
if (limit > 0 && isempty(&t->array[limit - 1])) { /* (1)? */
/* there must be a boundary before 'limit' */
if (limit >= 2 && !isempty(&t->array[limit - 2])) {
/* 'limit - 1' is a boundary; can it be a new limit? */
if (ispow2realasize(t) && !ispow2(limit - 1)) {
t->alimit = limit - 1;
setnorealasize(t); /* now 'alimit' is not the real size */
}
return limit - 1;
}
else { /* must search for a boundary in [0, limit] */
unsigned int boundary = binsearch(t->array, 0, limit);
/* can this boundary represent the real size of the array? */
if (ispow2realasize(t) && boundary > luaH_realasize(t) / 2) {
t->alimit = boundary; /* use it as the new limit */
setnorealasize(t);
}
return boundary;
}
}
/* 'limit' is zero or present in table */
if (!limitequalsasize(t)) { /* (2)? */
/* 'limit' > 0 and array has more elements after 'limit' */
if (isempty(&t->array[limit])) /* 'limit + 1' is empty? */
return limit; /* this is the boundary */
/* else, try last element in the array */
limit = luaH_realasize(t);
if (isempty(&t->array[limit - 1])) { /* empty? */
/* there must be a boundary in the array after old limit,
and it must be a valid new limit */
unsigned int boundary = binsearch(t->array, t->alimit, limit);
t->alimit = boundary;
return boundary;
}
/* else, new limit is present in the table; check the hash part */
}
/* (3) 'limit' is the last element and either is zero or present in table */
lua_assert(limit == luaH_realasize(t) &&
(limit == 0 || !isempty(&t->array[limit - 1])));
if (isdummy(t) || isempty(luaH_getint(t, cast(lua_Integer, limit + 1))))
return limit; /* 'limit + 1' is absent */
else /* 'limit + 1' is also present */
return hash_search(t, limit);
}
#if defined(LUA_DEBUG)
/* export these functions for the test library */
Node *luaH_mainposition (const Table *t, const TValue *key) {
return mainpositionTV(t, key);
}
int luaH_isdummy (const Table *t) { return isdummy(t); }
#endif
LTABLIB¶
/*
** $Id: ltablib.c $
** Library for Table Manipulation
** See Copyright Notice in lua.h
*/
#define ltablib_c
#define LUA_LIB
#include "lprefix.h"
#include <limits.h>
#include <stddef.h>
#include <string.h>
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "_native_lua_config.h" /* native Lua */
/*
** Operations that an object must define to mimic a table
** (some functions only need some of them)
*/
#define TAB_R 1 /* read */
#define TAB_W 2 /* write */
#define TAB_L 4 /* length */
#define TAB_RW (TAB_R | TAB_W) /* read/write */
#define aux_getn(L,n,w) (checktab(L, n, (w) | TAB_L), luaL_len(L, n))
static int checkfield (lua_State *L, const char *key, int n) {
lua_pushstring(L, key);
return (lua_rawget(L, -n) != LUA_TNIL);
}
/*
** Check that 'arg' either is a table or can behave like one (that is,
** has a metatable with the required metamethods)
*/
static void checktab (lua_State *L, int arg, int what) {
if (lua_type(L, arg) != LUA_TTABLE) { /* is it not a table? */
int n = 1; /* number of elements to pop */
if (lua_getmetatable(L, arg) && /* must have metatable */
(!(what & TAB_R) || checkfield(L, "__index", ++n)) &&
(!(what & TAB_W) || checkfield(L, "__newindex", ++n)) &&
(!(what & TAB_L) || checkfield(L, "__len", ++n))) {
lua_pop(L, n); /* pop metatable and tested metamethods */
}
else
luaL_checktype(L, arg, LUA_TTABLE); /* force an error */
}
}
static int tinsert (lua_State *L) {
lua_Integer e = aux_getn(L, 1, TAB_RW) + 1; /* first empty element */
lua_Integer pos; /* where to insert new element */
switch (lua_gettop(L)) {
case 2: { /* called with only 2 arguments */
pos = e; /* insert new element at the end */
break;
}
case 3: {
lua_Integer i;
pos = luaL_checkinteger(L, 2); /* 2nd argument is the position */
/* check whether 'pos' is in [1, e] */
luaL_argcheck(L, (lua_Unsigned)pos - 1u < (lua_Unsigned)e, 2,
"position out of bounds");
for (i = e; i > pos; i--) { /* move up elements */
lua_geti(L, 1, i - 1);
lua_seti(L, 1, i); /* t[i] = t[i - 1] */
}
break;
}
default: {
return luaL_error(L, "wrong number of arguments to 'insert'");
}
}
lua_seti(L, 1, pos); /* t[pos] = v */
return 0;
}
static int tremove (lua_State *L) {
lua_Integer size = aux_getn(L, 1, TAB_RW);
lua_Integer pos = luaL_optinteger(L, 2, size);
if (pos != size) /* validate 'pos' if given */
/* check whether 'pos' is in [1, size + 1] */
luaL_argcheck(L, (lua_Unsigned)pos - 1u <= (lua_Unsigned)size, 1,
"position out of bounds");
lua_geti(L, 1, pos); /* result = t[pos] */
for ( ; pos < size; pos++) {
lua_geti(L, 1, pos + 1);
lua_seti(L, 1, pos); /* t[pos] = t[pos + 1] */
}
lua_pushnil(L);
lua_seti(L, 1, pos); /* remove entry t[pos] */
return 1;
}
/*
** Copy elements (1[f], ..., 1[e]) into (tt[t], tt[t+1], ...). Whenever
** possible, copy in increasing order, which is better for rehashing.
** "possible" means destination after original range, or smaller
** than origin, or copying to another table.
*/
static int tmove (lua_State *L) {
lua_Integer f = luaL_checkinteger(L, 2);
lua_Integer e = luaL_checkinteger(L, 3);
lua_Integer t = luaL_checkinteger(L, 4);
int tt = !lua_isnoneornil(L, 5) ? 5 : 1; /* destination table */
checktab(L, 1, TAB_R);
checktab(L, tt, TAB_W);
if (e >= f) { /* otherwise, nothing to move */
lua_Integer n, i;
luaL_argcheck(L, f > 0 || e < LUA_MAXINTEGER + f, 3,
"too many elements to move");
n = e - f + 1; /* number of elements to move */
luaL_argcheck(L, t <= LUA_MAXINTEGER - n + 1, 4,
"destination wrap around");
if (t > e || t <= f || (tt != 1 && !lua_compare(L, 1, tt, LUA_OPEQ))) {
for (i = 0; i < n; i++) {
lua_geti(L, 1, f + i);
lua_seti(L, tt, t + i);
}
}
else {
for (i = n - 1; i >= 0; i--) {
lua_geti(L, 1, f + i);
lua_seti(L, tt, t + i);
}
}
}
lua_pushvalue(L, tt); /* return destination table */
return 1;
}
static void addfield (lua_State *L, luaL_Buffer *b, lua_Integer i) {
lua_geti(L, 1, i);
if (!lua_isstring(L, -1))
luaL_error(L, "invalid value (%s) at index %d in table for 'concat'",
luaL_typename(L, -1), i);
luaL_addvalue(b);
}
static int tconcat (lua_State *L) {
luaL_Buffer b;
lua_Integer last = aux_getn(L, 1, TAB_R);
size_t lsep;
const char *sep = luaL_optlstring(L, 2, "", &lsep);
lua_Integer i = luaL_optinteger(L, 3, 1);
last = luaL_optinteger(L, 4, last);
luaL_buffinit(L, &b);
for (; i < last; i++) {
addfield(L, &b, i);
luaL_addlstring(&b, sep, lsep);
}
if (i == last) /* add last value (if interval was not empty) */
addfield(L, &b, i);
luaL_pushresult(&b);
return 1;
}
/*
** {======================================================
** Pack/unpack
** =======================================================
*/
static int tpack (lua_State *L) {
int i;
int n = lua_gettop(L); /* number of elements to pack */
lua_createtable(L, n, 1); /* create result table */
lua_insert(L, 1); /* put it at index 1 */
for (i = n; i >= 1; i--) /* assign elements */
lua_seti(L, 1, i);
lua_pushinteger(L, n);
lua_setfield(L, 1, "n"); /* t.n = number of elements */
return 1; /* return table */
}
static int tunpack (lua_State *L) {
lua_Unsigned n;
lua_Integer i = luaL_optinteger(L, 2, 1);
lua_Integer e = luaL_opt(L, luaL_checkinteger, 3, luaL_len(L, 1));
if (i > e) return 0; /* empty range */
n = (lua_Unsigned)e - i; /* number of elements minus 1 (avoid overflows) */
if (n >= (unsigned int)INT_MAX || !lua_checkstack(L, (int)(++n)))
return luaL_error(L, "too many results to unpack");
for (; i < e; i++) { /* push arg[i..e - 1] (to avoid overflows) */
lua_geti(L, 1, i);
}
lua_geti(L, 1, e); /* push last element */
return (int)n;
}
/* }====================================================== */
/*
** {======================================================
** Quicksort
** (based on 'Algorithms in MODULA-3', Robert Sedgewick;
** Addison-Wesley, 1993.)
** =======================================================
*/
/* type for array indices */
typedef unsigned int IdxT;
/*
** Produce a "random" 'unsigned int' to randomize pivot choice. This
** macro is used only when 'sort' detects a big imbalance in the result
** of a partition. (If you don't want/need this "randomness", ~0 is a
** good choice.)
*/
#if !defined(l_randomizePivot) /* { */
#include <time.h>
/* size of 'e' measured in number of 'unsigned int's */
#define sof(e) (sizeof(e) / sizeof(unsigned int))
/*
** Use 'time' and 'clock' as sources of "randomness". Because we don't
** know the types 'clock_t' and 'time_t', we cannot cast them to
** anything without risking overflows. A safe way to use their values
** is to copy them to an array of a known type and use the array values.
*/
static unsigned int l_randomizePivot (void) {
clock_t c = clock();
time_t t = time(NULL);
unsigned int buff[sof(c) + sof(t)];
unsigned int i, rnd = 0;
memcpy(buff, &c, sof(c) * sizeof(unsigned int));
memcpy(buff + sof(c), &t, sof(t) * sizeof(unsigned int));
for (i = 0; i < sof(buff); i++)
rnd += buff[i];
return rnd;
}
#endif /* } */
/* arrays larger than 'RANLIMIT' may use randomized pivots */
#define RANLIMIT 100u
static void set2 (lua_State *L, IdxT i, IdxT j) {
lua_seti(L, 1, i);
lua_seti(L, 1, j);
}
/*
** Return true iff value at stack index 'a' is less than the value at
** index 'b' (according to the order of the sort).
*/
static int sort_comp (lua_State *L, int a, int b) {
if (lua_isnil(L, 2)) /* no function? */
return lua_compare(L, a, b, LUA_OPLT); /* a < b */
else { /* function */
int res;
lua_pushvalue(L, 2); /* push function */
lua_pushvalue(L, a-1); /* -1 to compensate function */
lua_pushvalue(L, b-2); /* -2 to compensate function and 'a' */
lua_call(L, 2, 1); /* call function */
res = lua_toboolean(L, -1); /* get result */
lua_pop(L, 1); /* pop result */
return res;
}
}
/*
** Does the partition: Pivot P is at the top of the stack.
** precondition: a[lo] <= P == a[up-1] <= a[up],
** so it only needs to do the partition from lo + 1 to up - 2.
** Pos-condition: a[lo .. i - 1] <= a[i] == P <= a[i + 1 .. up]
** returns 'i'.
*/
static IdxT partition (lua_State *L, IdxT lo, IdxT up) {
IdxT i = lo; /* will be incremented before first use */
IdxT j = up - 1; /* will be decremented before first use */
/* loop invariant: a[lo .. i] <= P <= a[j .. up] */
for (;;) {
/* next loop: repeat ++i while a[i] < P */
while ((void)lua_geti(L, 1, ++i), sort_comp(L, -1, -2)) {
if (i == up - 1) /* a[i] < P but a[up - 1] == P ?? */
luaL_error(L, "invalid order function for sorting");
lua_pop(L, 1); /* remove a[i] */
}
/* after the loop, a[i] >= P and a[lo .. i - 1] < P */
/* next loop: repeat --j while P < a[j] */
while ((void)lua_geti(L, 1, --j), sort_comp(L, -3, -1)) {
if (j < i) /* j < i but a[j] > P ?? */
luaL_error(L, "invalid order function for sorting");
lua_pop(L, 1); /* remove a[j] */
}
/* after the loop, a[j] <= P and a[j + 1 .. up] >= P */
if (j < i) { /* no elements out of place? */
/* a[lo .. i - 1] <= P <= a[j + 1 .. i .. up] */
lua_pop(L, 1); /* pop a[j] */
/* swap pivot (a[up - 1]) with a[i] to satisfy pos-condition */
set2(L, up - 1, i);
return i;
}
/* otherwise, swap a[i] - a[j] to restore invariant and repeat */
set2(L, i, j);
}
}
/*
** Choose an element in the middle (2nd-3th quarters) of [lo,up]
** "randomized" by 'rnd'
*/
static IdxT choosePivot (IdxT lo, IdxT up, unsigned int rnd) {
IdxT r4 = (up - lo) / 4; /* range/4 */
IdxT p = rnd % (r4 * 2) + (lo + r4);
lua_assert(lo + r4 <= p && p <= up - r4);
return p;
}
/*
** Quicksort algorithm (recursive function)
*/
static void auxsort (lua_State *L, IdxT lo, IdxT up,
unsigned int rnd) {
while (lo < up) { /* loop for tail recursion */
IdxT p; /* Pivot index */
IdxT n; /* to be used later */
/* sort elements 'lo', 'p', and 'up' */
lua_geti(L, 1, lo);
lua_geti(L, 1, up);
if (sort_comp(L, -1, -2)) /* a[up] < a[lo]? */
set2(L, lo, up); /* swap a[lo] - a[up] */
else
lua_pop(L, 2); /* remove both values */
if (up - lo == 1) /* only 2 elements? */
return; /* already sorted */
if (up - lo < RANLIMIT || rnd == 0) /* small interval or no randomize? */
p = (lo + up)/2; /* middle element is a good pivot */
else /* for larger intervals, it is worth a random pivot */
p = choosePivot(lo, up, rnd);
lua_geti(L, 1, p);
lua_geti(L, 1, lo);
if (sort_comp(L, -2, -1)) /* a[p] < a[lo]? */
set2(L, p, lo); /* swap a[p] - a[lo] */
else {
lua_pop(L, 1); /* remove a[lo] */
lua_geti(L, 1, up);
if (sort_comp(L, -1, -2)) /* a[up] < a[p]? */
set2(L, p, up); /* swap a[up] - a[p] */
else
lua_pop(L, 2);
}
if (up - lo == 2) /* only 3 elements? */
return; /* already sorted */
lua_geti(L, 1, p); /* get middle element (Pivot) */
lua_pushvalue(L, -1); /* push Pivot */
lua_geti(L, 1, up - 1); /* push a[up - 1] */
set2(L, p, up - 1); /* swap Pivot (a[p]) with a[up - 1] */
p = partition(L, lo, up);
/* a[lo .. p - 1] <= a[p] == P <= a[p + 1 .. up] */
if (p - lo < up - p) { /* lower interval is smaller? */
auxsort(L, lo, p - 1, rnd); /* call recursively for lower interval */
n = p - lo; /* size of smaller interval */
lo = p + 1; /* tail call for [p + 1 .. up] (upper interval) */
}
else {
auxsort(L, p + 1, up, rnd); /* call recursively for upper interval */
n = up - p; /* size of smaller interval */
up = p - 1; /* tail call for [lo .. p - 1] (lower interval) */
}
if ((up - lo) / 128 > n) /* partition too imbalanced? */
rnd = l_randomizePivot(); /* try a new randomization */
} /* tail call auxsort(L, lo, up, rnd) */
}
static int sort (lua_State *L) {
lua_Integer n = aux_getn(L, 1, TAB_RW);
if (n > 1) { /* non-trivial interval? */
luaL_argcheck(L, n < INT_MAX, 1, "array too big");
if (!lua_isnoneornil(L, 2)) /* is there a 2nd argument? */
luaL_checktype(L, 2, LUA_TFUNCTION); /* must be a function */
lua_settop(L, 2); /* make sure there are two arguments */
auxsort(L, 1, (IdxT)n, 0);
}
return 0;
}
/* }====================================================== */
static const luaL_Reg tab_funcs[] = {
{"concat", tconcat},
{"insert", tinsert},
{"pack", tpack},
{"unpack", tunpack},
{"remove", tremove},
{"move", tmove},
{"sort", sort},
{NULL, NULL}
};
LUAMOD_API int luaopen_table (lua_State *L) {
luaL_newlib(L, tab_funcs);
return 1;
}
LTM¶
/*
** $Id: ltm.h $
** Tag methods
** See Copyright Notice in lua.h
*/
#ifndef ltm_h
#define ltm_h
#include "lobject.h"
#include "_native_lua_config.h" /* native Lua */
/*
* WARNING: if you change the order of this enumeration,
* grep "ORDER TM" and "ORDER OP"
*/
typedef enum {
TM_INDEX,
TM_NEWINDEX,
TM_GC,
TM_MODE,
TM_LEN,
TM_EQ, /* last tag method with fast access */
TM_ADD,
TM_SUB,
TM_MUL,
TM_MOD,
TM_POW,
TM_DIV,
TM_IDIV,
TM_BAND,
TM_BOR,
TM_BXOR,
TM_SHL,
TM_SHR,
TM_UNM,
TM_BNOT,
TM_LT,
TM_LE,
TM_CONCAT,
TM_CALL,
TM_CLOSE,
TM_N /* number of elements in the enum */
} TMS;
/*
** Test whether there is no tagmethod.
** (Because tagmethods use raw accesses, the result may be an "empty" nil.)
*/
#define notm(tm) ttisnil(tm)
#define gfasttm(g,et,e) ((et) == NULL ? NULL : \
((et)->flags & (1u<<(e))) ? NULL : luaT_gettm(et, e, (g)->tmname[e]))
#define fasttm(l,et,e) gfasttm(G(l), et, e)
#define ttypename(x) luaT_typenames_[(x) + 1]
LUAI_DDEC(const char *const luaT_typenames_[LUA_TOTALTYPES];)
LUAI_FUNC const char *luaT_objtypename (lua_State *L, const TValue *o);
LUAI_FUNC const TValue *luaT_gettm (Table *events, TMS event, TString *ename);
LUAI_FUNC const TValue *luaT_gettmbyobj (lua_State *L, const TValue *o,
TMS event);
LUAI_FUNC void luaT_init (lua_State *L);
LUAI_FUNC void luaT_callTM (lua_State *L, const TValue *f, const TValue *p1,
const TValue *p2, const TValue *p3);
LUAI_FUNC void luaT_callTMres (lua_State *L, const TValue *f,
const TValue *p1, const TValue *p2, StkId p3);
LUAI_FUNC void luaT_trybinTM (lua_State *L, const TValue *p1, const TValue *p2,
StkId res, TMS event);
LUAI_FUNC void luaT_tryconcatTM (lua_State *L);
LUAI_FUNC void luaT_trybinassocTM (lua_State *L, const TValue *p1,
const TValue *p2, int inv, StkId res, TMS event);
LUAI_FUNC void luaT_trybiniTM (lua_State *L, const TValue *p1, lua_Integer i2,
int inv, StkId res, TMS event);
LUAI_FUNC int luaT_callorderTM (lua_State *L, const TValue *p1,
const TValue *p2, TMS event);
LUAI_FUNC int luaT_callorderiTM (lua_State *L, const TValue *p1, int v2,
int inv, int isfloat, TMS event);
LUAI_FUNC void luaT_adjustvarargs (lua_State *L, int nfixparams,
struct CallInfo *ci, const Proto *p);
LUAI_FUNC void luaT_getvarargs (lua_State *L, struct CallInfo *ci,
StkId where, int wanted);
#endif
/*
** $Id: ltm.c $
** Tag methods
** See Copyright Notice in lua.h
*/
#define ltm_c
#define LUA_CORE
#include "lprefix.h"
#include <string.h>
#include "lua.h"
#include "ldebug.h"
#include "ldo.h"
#include "lgc.h"
#include "lobject.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "ltm.h"
#include "lvm.h"
static const char udatatypename[] = "userdata";
LUAI_DDEF const char *const luaT_typenames_[LUA_TOTALTYPES] = {
"no value",
"nil", "boolean", udatatypename, "number",
"string", "table", "function", udatatypename, "thread",
"upvalue", "proto" /* these last cases are used for tests only */
};
void luaT_init (lua_State *L) {
static const char *const luaT_eventname[] = { /* ORDER TM */
"__index", "__newindex",
"__gc", "__mode", "__len", "__eq",
"__add", "__sub", "__mul", "__mod", "__pow",
"__div", "__idiv",
"__band", "__bor", "__bxor", "__shl", "__shr",
"__unm", "__bnot", "__lt", "__le",
"__concat", "__call", "__close"
};
int i;
for (i=0; i<TM_N; i++) {
G(L)->tmname[i] = luaS_new(L, luaT_eventname[i]);
luaC_fix(L, obj2gco(G(L)->tmname[i])); /* never collect these names */
}
}
/*
** function to be used with macro "fasttm": optimized for absence of
** tag methods
*/
const TValue *luaT_gettm (Table *events, TMS event, TString *ename) {
const TValue *tm = luaH_getshortstr(events, ename);
lua_assert(event <= TM_EQ);
if (notm(tm)) { /* no tag method? */
events->flags |= cast_byte(1u<<event); /* cache this fact */
return NULL;
}
else return tm;
}
const TValue *luaT_gettmbyobj (lua_State *L, const TValue *o, TMS event) {
Table *mt;
switch (ttype(o)) {
case LUA_TTABLE:
mt = hvalue(o)->metatable;
break;
case LUA_TUSERDATA:
mt = uvalue(o)->metatable;
break;
default:
mt = G(L)->mt[ttype(o)];
}
return (mt ? luaH_getshortstr(mt, G(L)->tmname[event]) : &G(L)->nilvalue);
}
/*
** Return the name of the type of an object. For tables and userdata
** with metatable, use their '__name' metafield, if present.
*/
const char *luaT_objtypename (lua_State *L, const TValue *o) {
Table *mt;
if ((ttistable(o) && (mt = hvalue(o)->metatable) != NULL) ||
(ttisfulluserdata(o) && (mt = uvalue(o)->metatable) != NULL)) {
const TValue *name = luaH_getshortstr(mt, luaS_new(L, "__name"));
if (ttisstring(name)) /* is '__name' a string? */
return getstr(tsvalue(name)); /* use it as type name */
}
return ttypename(ttype(o)); /* else use standard type name */
}
void luaT_callTM (lua_State *L, const TValue *f, const TValue *p1,
const TValue *p2, const TValue *p3) {
StkId func = L->top;
setobj2s(L, func, f); /* push function (assume EXTRA_STACK) */
setobj2s(L, func + 1, p1); /* 1st argument */
setobj2s(L, func + 2, p2); /* 2nd argument */
setobj2s(L, func + 3, p3); /* 3rd argument */
L->top = func + 4;
/* metamethod may yield only when called from Lua code */
if (isLuacode(L->ci))
luaD_call(L, func, 0);
else
luaD_callnoyield(L, func, 0);
}
void luaT_callTMres (lua_State *L, const TValue *f, const TValue *p1,
const TValue *p2, StkId res) {
ptrdiff_t result = savestack(L, res);
StkId func = L->top;
setobj2s(L, func, f); /* push function (assume EXTRA_STACK) */
setobj2s(L, func + 1, p1); /* 1st argument */
setobj2s(L, func + 2, p2); /* 2nd argument */
L->top += 3;
/* metamethod may yield only when called from Lua code */
if (isLuacode(L->ci))
luaD_call(L, func, 1);
else
luaD_callnoyield(L, func, 1);
res = restorestack(L, result);
setobjs2s(L, res, --L->top); /* move result to its place */
}
static int callbinTM (lua_State *L, const TValue *p1, const TValue *p2,
StkId res, TMS event) {
const TValue *tm = luaT_gettmbyobj(L, p1, event); /* try first operand */
if (notm(tm))
tm = luaT_gettmbyobj(L, p2, event); /* try second operand */
if (notm(tm)) return 0;
luaT_callTMres(L, tm, p1, p2, res);
return 1;
}
void luaT_trybinTM (lua_State *L, const TValue *p1, const TValue *p2,
StkId res, TMS event) {
if (!callbinTM(L, p1, p2, res, event)) {
switch (event) {
case TM_BAND: case TM_BOR: case TM_BXOR:
case TM_SHL: case TM_SHR: case TM_BNOT: {
if (ttisnumber(p1) && ttisnumber(p2))
luaG_tointerror(L, p1, p2);
else
luaG_opinterror(L, p1, p2, "perform bitwise operation on");
}
/* calls never return, but to avoid warnings: *//* FALLTHROUGH */
default:
luaG_opinterror(L, p1, p2, "perform arithmetic on");
}
}
}
void luaT_tryconcatTM (lua_State *L) {
StkId top = L->top;
if (!callbinTM(L, s2v(top - 2), s2v(top - 1), top - 2, TM_CONCAT))
luaG_concaterror(L, s2v(top - 2), s2v(top - 1));
}
void luaT_trybinassocTM (lua_State *L, const TValue *p1, const TValue *p2,
int flip, StkId res, TMS event) {
if (flip)
luaT_trybinTM(L, p2, p1, res, event);
else
luaT_trybinTM(L, p1, p2, res, event);
}
void luaT_trybiniTM (lua_State *L, const TValue *p1, lua_Integer i2,
int flip, StkId res, TMS event) {
TValue aux;
setivalue(&aux, i2);
luaT_trybinassocTM(L, p1, &aux, flip, res, event);
}
/*
** Calls an order tag method.
** For lessequal, LUA_COMPAT_LT_LE keeps compatibility with old
** behavior: if there is no '__le', try '__lt', based on l <= r iff
** !(r < l) (assuming a total order). If the metamethod yields during
** this substitution, the continuation has to know about it (to negate
** the result of r<l); bit CIST_LEQ in the call status keeps that
** information.
*/
int luaT_callorderTM (lua_State *L, const TValue *p1, const TValue *p2,
TMS event) {
if (callbinTM(L, p1, p2, L->top, event)) /* try original event */
return !l_isfalse(s2v(L->top));
#if defined(LUA_COMPAT_LT_LE)
else if (event == TM_LE) {
/* try '!(p2 < p1)' for '(p1 <= p2)' */
L->ci->callstatus |= CIST_LEQ; /* mark it is doing 'lt' for 'le' */
if (callbinTM(L, p2, p1, L->top, TM_LT)) {
L->ci->callstatus ^= CIST_LEQ; /* clear mark */
return l_isfalse(s2v(L->top));
}
/* else error will remove this 'ci'; no need to clear mark */
}
#endif
luaG_ordererror(L, p1, p2); /* no metamethod found */
return 0; /* to avoid warnings */
}
int luaT_callorderiTM (lua_State *L, const TValue *p1, int v2,
int flip, int isfloat, TMS event) {
TValue aux; const TValue *p2;
if (isfloat) {
setfltvalue(&aux, cast_num(v2));
}
else
setivalue(&aux, v2);
if (flip) { /* arguments were exchanged? */
p2 = p1; p1 = &aux; /* correct them */
}
else
p2 = &aux;
return luaT_callorderTM(L, p1, p2, event);
}
void luaT_adjustvarargs (lua_State *L, int nfixparams, CallInfo *ci,
const Proto *p) {
int i;
int actual = cast_int(L->top - ci->func) - 1; /* number of arguments */
int nextra = actual - nfixparams; /* number of extra arguments */
ci->u.l.nextraargs = nextra;
checkstackGC(L, p->maxstacksize + 1);
/* copy function to the top of the stack */
setobjs2s(L, L->top++, ci->func);
/* move fixed parameters to the top of the stack */
for (i = 1; i <= nfixparams; i++) {
setobjs2s(L, L->top++, ci->func + i);
setnilvalue(s2v(ci->func + i)); /* erase original parameter (for GC) */
}
ci->func += actual + 1;
ci->top += actual + 1;
lua_assert(L->top <= ci->top && ci->top <= L->stack_last);
}
void luaT_getvarargs (lua_State *L, CallInfo *ci, StkId where, int wanted) {
int i;
int nextra = ci->u.l.nextraargs;
if (wanted < 0) {
wanted = nextra; /* get all extra arguments available */
checkstackp(L, nextra, where); /* ensure stack space */
L->top = where + nextra; /* next instruction will need top */
}
for (i = 0; i < wanted && i < nextra; i++)
setobjs2s(L, where + i, ci->func - nextra + i);
for (; i < wanted; i++) /* complete required results with nil */
setnilvalue(s2v(where + i));
}
LUA¶
/*
** $Id: lua.h $
** Lua - A Scripting Language
** Lua.org, PUC-Rio, Brazil (http://www.lua.org)
** See Copyright Notice at the end of this file
*/
#ifndef lua_h
#define lua_h
#include <stdarg.h>
#include <stddef.h>
#include "luaconf.h"
#include "_native_lua_config.h" /* native Lua */
#define LUA_VERSION_MAJOR "5"
#define LUA_VERSION_MINOR "4"
#define LUA_VERSION_RELEASE "0"
#define LUA_VERSION_NUM 504
#define LUA_VERSION_RELEASE_NUM (LUA_VERSION_NUM * 100 + 0)
#define LUA_VERSION "Lua " LUA_VERSION_MAJOR "." LUA_VERSION_MINOR
#define LUA_RELEASE LUA_VERSION "." LUA_VERSION_RELEASE
#define LUA_COPYRIGHT LUA_RELEASE " Copyright (C) 1994-2020 Lua.org, PUC-Rio"
#define LUA_AUTHORS "R. Ierusalimschy, L. H. de Figueiredo, W. Celes"
/* mark for precompiled code ('<esc>Lua') */
#define LUA_SIGNATURE "\x1bLua"
/* option for multiple returns in 'lua_pcall' and 'lua_call' */
#define LUA_MULTRET (-1)
/*
** Pseudo-indices
** (-LUAI_MAXSTACK is the minimum valid index; we keep some free empty
** space after that to help overflow detection)
*/
#define LUA_REGISTRYINDEX (-LUAI_MAXSTACK - 1000)
#define lua_upvalueindex(i) (LUA_REGISTRYINDEX - (i))
/* thread status */
#define LUA_OK 0
#define LUA_YIELD 1
#define LUA_ERRRUN 2
#define LUA_ERRSYNTAX 3
#define LUA_ERRMEM 4
#define LUA_ERRERR 5
typedef struct lua_State lua_State;
/*
** basic types
*/
#define LUA_TNONE (-1)
#define LUA_TNIL 0
#define LUA_TBOOLEAN 1
#define LUA_TLIGHTUSERDATA 2
#define LUA_TNUMBER 3
#define LUA_TSTRING 4
#define LUA_TTABLE 5
#define LUA_TFUNCTION 6
#define LUA_TUSERDATA 7
#define LUA_TTHREAD 8
#define LUA_NUMTYPES 9
/* minimum Lua stack available to a C function */
#define LUA_MINSTACK 20
/* predefined values in the registry */
#define LUA_RIDX_MAINTHREAD 1
#define LUA_RIDX_GLOBALS 2
#define LUA_RIDX_LAST LUA_RIDX_GLOBALS
/* type of numbers in Lua */
typedef LUA_NUMBER lua_Number;
/* type for integer functions */
typedef LUA_INTEGER lua_Integer;
/* unsigned integer type */
typedef LUA_UNSIGNED lua_Unsigned;
/* type for continuation-function contexts */
typedef LUA_KCONTEXT lua_KContext;
/*
** Type for C functions registered with Lua
*/
typedef int (*lua_CFunction) (lua_State *L);
/*
** Type for continuation functions
*/
typedef int (*lua_KFunction) (lua_State *L, int status, lua_KContext ctx);
/*
** Type for functions that read/write blocks when loading/dumping Lua chunks
*/
typedef const char * (*lua_Reader) (lua_State *L, void *ud, size_t *sz);
typedef int (*lua_Writer) (lua_State *L, const void *p, size_t sz, void *ud);
/*
** Type for memory-allocation functions
*/
typedef void * (*lua_Alloc) (void *ud, void *ptr, size_t osize, size_t nsize);
/*
** Type for warning functions
*/
typedef void (*lua_WarnFunction) (void *ud, const char *msg, int tocont);
/*
** generic extra include file
*/
#if defined(LUA_USER_H)
#include LUA_USER_H
#endif
/*
** RCS ident string
*/
extern const char lua_ident[];
/*
** state manipulation
*/
LUA_API lua_State *(lua_newstate) (lua_Alloc f, void *ud);
LUA_API void (lua_close) (lua_State *L);
LUA_API lua_State *(lua_newthread) (lua_State *L);
LUA_API int (lua_resetthread) (lua_State *L);
LUA_API lua_CFunction (lua_atpanic) (lua_State *L, lua_CFunction panicf);
LUA_API lua_Number (lua_version) (lua_State *L);
/*
** basic stack manipulation
*/
LUA_API int (lua_absindex) (lua_State *L, int idx);
LUA_API int (lua_gettop) (lua_State *L);
LUA_API void (lua_settop) (lua_State *L, int idx);
LUA_API void (lua_pushvalue) (lua_State *L, int idx);
LUA_API void (lua_rotate) (lua_State *L, int idx, int n);
LUA_API void (lua_copy) (lua_State *L, int fromidx, int toidx);
LUA_API int (lua_checkstack) (lua_State *L, int n);
LUA_API void (lua_xmove) (lua_State *from, lua_State *to, int n);
/*
** access functions (stack -> C)
*/
LUA_API int (lua_isnumber) (lua_State *L, int idx);
LUA_API int (lua_isstring) (lua_State *L, int idx);
LUA_API int (lua_iscfunction) (lua_State *L, int idx);
LUA_API int (lua_isinteger) (lua_State *L, int idx);
LUA_API int (lua_isuserdata) (lua_State *L, int idx);
LUA_API int (lua_type) (lua_State *L, int idx);
LUA_API const char *(lua_typename) (lua_State *L, int tp);
LUA_API lua_Number (lua_tonumberx) (lua_State *L, int idx, int *isnum);
LUA_API lua_Integer (lua_tointegerx) (lua_State *L, int idx, int *isnum);
LUA_API int (lua_toboolean) (lua_State *L, int idx);
LUA_API const char *(lua_tolstring) (lua_State *L, int idx, size_t *len);
LUA_API lua_Unsigned (lua_rawlen) (lua_State *L, int idx);
LUA_API lua_CFunction (lua_tocfunction) (lua_State *L, int idx);
LUA_API void *(lua_touserdata) (lua_State *L, int idx);
LUA_API lua_State *(lua_tothread) (lua_State *L, int idx);
LUA_API const void *(lua_topointer) (lua_State *L, int idx);
/*
** Comparison and arithmetic functions
*/
#define LUA_OPADD 0 /* ORDER TM, ORDER OP */
#define LUA_OPSUB 1
#define LUA_OPMUL 2
#define LUA_OPMOD 3
#define LUA_OPPOW 4
#define LUA_OPDIV 5
#define LUA_OPIDIV 6
#define LUA_OPBAND 7
#define LUA_OPBOR 8
#define LUA_OPBXOR 9
#define LUA_OPSHL 10
#define LUA_OPSHR 11
#define LUA_OPUNM 12
#define LUA_OPBNOT 13
LUA_API void (lua_arith) (lua_State *L, int op);
#define LUA_OPEQ 0
#define LUA_OPLT 1
#define LUA_OPLE 2
LUA_API int (lua_rawequal) (lua_State *L, int idx1, int idx2);
LUA_API int (lua_compare) (lua_State *L, int idx1, int idx2, int op);
/*
** push functions (C -> stack)
*/
LUA_API void (lua_pushnil) (lua_State *L);
LUA_API void (lua_pushnumber) (lua_State *L, lua_Number n);
LUA_API void (lua_pushinteger) (lua_State *L, lua_Integer n);
LUA_API const char *(lua_pushlstring) (lua_State *L, const char *s, size_t len);
LUA_API const char *(lua_pushstring) (lua_State *L, const char *s);
LUA_API const char *(lua_pushvfstring) (lua_State *L, const char *fmt,
va_list argp);
LUA_API const char *(lua_pushfstring) (lua_State *L, const char *fmt, ...);
LUA_API void (lua_pushcclosure) (lua_State *L, lua_CFunction fn, int n);
LUA_API void (lua_pushboolean) (lua_State *L, int b);
LUA_API void (lua_pushlightuserdata) (lua_State *L, void *p);
LUA_API int (lua_pushthread) (lua_State *L);
/*
** get functions (Lua -> stack)
*/
LUA_API int (lua_getglobal) (lua_State *L, const char *name);
LUA_API int (lua_gettable) (lua_State *L, int idx);
LUA_API int (lua_getfield) (lua_State *L, int idx, const char *k);
LUA_API int (lua_geti) (lua_State *L, int idx, lua_Integer n);
LUA_API int (lua_rawget) (lua_State *L, int idx);
LUA_API int (lua_rawgeti) (lua_State *L, int idx, lua_Integer n);
LUA_API int (lua_rawgetp) (lua_State *L, int idx, const void *p);
LUA_API void (lua_createtable) (lua_State *L, int narr, int nrec);
LUA_API void *(lua_newuserdatauv) (lua_State *L, size_t sz, int nuvalue);
LUA_API int (lua_getmetatable) (lua_State *L, int objindex);
LUA_API int (lua_getiuservalue) (lua_State *L, int idx, int n);
/*
** set functions (stack -> Lua)
*/
LUA_API void (lua_setglobal) (lua_State *L, const char *name);
LUA_API void (lua_settable) (lua_State *L, int idx);
LUA_API void (lua_setfield) (lua_State *L, int idx, const char *k);
LUA_API void (lua_seti) (lua_State *L, int idx, lua_Integer n);
LUA_API void (lua_rawset) (lua_State *L, int idx);
LUA_API void (lua_rawseti) (lua_State *L, int idx, lua_Integer n);
LUA_API void (lua_rawsetp) (lua_State *L, int idx, const void *p);
LUA_API int (lua_setmetatable) (lua_State *L, int objindex);
LUA_API int (lua_setiuservalue) (lua_State *L, int idx, int n);
/*
** 'load' and 'call' functions (load and run Lua code)
*/
LUA_API void (lua_callk) (lua_State *L, int nargs, int nresults,
lua_KContext ctx, lua_KFunction k);
#define lua_call(L,n,r) lua_callk(L, (n), (r), 0, NULL)
LUA_API int (lua_pcallk) (lua_State *L, int nargs, int nresults, int errfunc,
lua_KContext ctx, lua_KFunction k);
#define lua_pcall(L,n,r,f) lua_pcallk(L, (n), (r), (f), 0, NULL)
LUA_API int (lua_load) (lua_State *L, lua_Reader reader, void *dt,
const char *chunkname, const char *mode);
LUA_API int (lua_dump) (lua_State *L, lua_Writer writer, void *data, int strip);
/*
** coroutine functions
*/
LUA_API int (lua_yieldk) (lua_State *L, int nresults, lua_KContext ctx,
lua_KFunction k);
LUA_API int (lua_resume) (lua_State *L, lua_State *from, int narg,
int *nres);
LUA_API int (lua_status) (lua_State *L);
LUA_API int (lua_isyieldable) (lua_State *L);
#define lua_yield(L,n) lua_yieldk(L, (n), 0, NULL)
/*
** Warning-related functions
*/
LUA_API void (lua_setwarnf) (lua_State *L, lua_WarnFunction f, void *ud);
LUA_API void (lua_warning) (lua_State *L, const char *msg, int tocont);
/*
** garbage-collection function and options
*/
#define LUA_GCSTOP 0
#define LUA_GCRESTART 1
#define LUA_GCCOLLECT 2
#define LUA_GCCOUNT 3
#define LUA_GCCOUNTB 4
#define LUA_GCSTEP 5
#define LUA_GCSETPAUSE 6
#define LUA_GCSETSTEPMUL 7
#define LUA_GCISRUNNING 9
#define LUA_GCGEN 10
#define LUA_GCINC 11
LUA_API int (lua_gc) (lua_State *L, int what, ...);
/*
** miscellaneous functions
*/
LUA_API int (lua_error) (lua_State *L);
LUA_API int (lua_next) (lua_State *L, int idx);
LUA_API void (lua_concat) (lua_State *L, int n);
LUA_API void (lua_len) (lua_State *L, int idx);
LUA_API size_t (lua_stringtonumber) (lua_State *L, const char *s);
LUA_API lua_Alloc (lua_getallocf) (lua_State *L, void **ud);
LUA_API void (lua_setallocf) (lua_State *L, lua_Alloc f, void *ud);
LUA_API void (lua_toclose) (lua_State *L, int idx);
/*
** {==============================================================
** some useful macros
** ===============================================================
*/
#define lua_getextraspace(L) ((void *)((char *)(L) - LUA_EXTRASPACE))
#define lua_tonumber(L,i) lua_tonumberx(L,(i),NULL)
#define lua_tointeger(L,i) lua_tointegerx(L,(i),NULL)
#define lua_pop(L,n) lua_settop(L, -(n)-1)
#define lua_newtable(L) lua_createtable(L, 0, 0)
#define lua_register(L,n,f) (lua_pushcfunction(L, (f)), lua_setglobal(L, (n)))
#define lua_pushcfunction(L,f) lua_pushcclosure(L, (f), 0)
#define lua_isfunction(L,n) (lua_type(L, (n)) == LUA_TFUNCTION)
#define lua_istable(L,n) (lua_type(L, (n)) == LUA_TTABLE)
#define lua_islightuserdata(L,n) (lua_type(L, (n)) == LUA_TLIGHTUSERDATA)
#define lua_isnil(L,n) (lua_type(L, (n)) == LUA_TNIL)
#define lua_isboolean(L,n) (lua_type(L, (n)) == LUA_TBOOLEAN)
#define lua_isthread(L,n) (lua_type(L, (n)) == LUA_TTHREAD)
#define lua_isnone(L,n) (lua_type(L, (n)) == LUA_TNONE)
#define lua_isnoneornil(L, n) (lua_type(L, (n)) <= 0)
#define lua_pushliteral(L, s) lua_pushstring(L, "" s)
#define lua_pushglobaltable(L) \
((void)lua_rawgeti(L, LUA_REGISTRYINDEX, LUA_RIDX_GLOBALS))
#define lua_tostring(L,i) lua_tolstring(L, (i), NULL)
#define lua_insert(L,idx) lua_rotate(L, (idx), 1)
#define lua_remove(L,idx) (lua_rotate(L, (idx), -1), lua_pop(L, 1))
#define lua_replace(L,idx) (lua_copy(L, -1, (idx)), lua_pop(L, 1))
/* }============================================================== */
/*
** {==============================================================
** compatibility macros
** ===============================================================
*/
#if defined(LUA_COMPAT_APIINTCASTS)
#define lua_pushunsigned(L,n) lua_pushinteger(L, (lua_Integer)(n))
#define lua_tounsignedx(L,i,is) ((lua_Unsigned)lua_tointegerx(L,i,is))
#define lua_tounsigned(L,i) lua_tounsignedx(L,(i),NULL)
#endif
#define lua_newuserdata(L,s) lua_newuserdatauv(L,s,1)
#define lua_getuservalue(L,idx) lua_getiuservalue(L,idx,1)
#define lua_setuservalue(L,idx) lua_setiuservalue(L,idx,1)
#define LUA_NUMTAGS LUA_NUMTYPES
/* }============================================================== */
/*
** {======================================================================
** Debug API
** =======================================================================
*/
/*
** Event codes
*/
#define LUA_HOOKCALL 0
#define LUA_HOOKRET 1
#define LUA_HOOKLINE 2
#define LUA_HOOKCOUNT 3
#define LUA_HOOKTAILCALL 4
/*
** Event masks
*/
#define LUA_MASKCALL (1 << LUA_HOOKCALL)
#define LUA_MASKRET (1 << LUA_HOOKRET)
#define LUA_MASKLINE (1 << LUA_HOOKLINE)
#define LUA_MASKCOUNT (1 << LUA_HOOKCOUNT)
typedef struct lua_Debug lua_Debug; /* activation record */
/* Functions to be called by the debugger in specific events */
typedef void (*lua_Hook) (lua_State *L, lua_Debug *ar);
LUA_API int (lua_getstack) (lua_State *L, int level, lua_Debug *ar);
LUA_API int (lua_getinfo) (lua_State *L, const char *what, lua_Debug *ar);
LUA_API const char *(lua_getlocal) (lua_State *L, const lua_Debug *ar, int n);
LUA_API const char *(lua_setlocal) (lua_State *L, const lua_Debug *ar, int n);
LUA_API const char *(lua_getupvalue) (lua_State *L, int funcindex, int n);
LUA_API const char *(lua_setupvalue) (lua_State *L, int funcindex, int n);
LUA_API void *(lua_upvalueid) (lua_State *L, int fidx, int n);
LUA_API void (lua_upvaluejoin) (lua_State *L, int fidx1, int n1,
int fidx2, int n2);
LUA_API void (lua_sethook) (lua_State *L, lua_Hook func, int mask, int count);
LUA_API lua_Hook (lua_gethook) (lua_State *L);
LUA_API int (lua_gethookmask) (lua_State *L);
LUA_API int (lua_gethookcount) (lua_State *L);
LUA_API int (lua_setcstacklimit) (lua_State *L, unsigned int limit);
struct lua_Debug {
int event;
const char *name; /* (n) */
const char *namewhat; /* (n) 'global', 'local', 'field', 'method' */
const char *what; /* (S) 'Lua', 'C', 'main', 'tail' */
const char *source; /* (S) */
size_t srclen; /* (S) */
int currentline; /* (l) */
int linedefined; /* (S) */
int lastlinedefined; /* (S) */
unsigned char nups; /* (u) number of upvalues */
unsigned char nparams;/* (u) number of parameters */
char isvararg; /* (u) */
char istailcall; /* (t) */
unsigned short ftransfer; /* (r) index of first value transferred */
unsigned short ntransfer; /* (r) number of transferred values */
char short_src[LUA_IDSIZE]; /* (S) */
/* private part */
struct CallInfo *i_ci; /* active function */
};
/* }====================================================================== */
/******************************************************************************
* Copyright (C) 1994-2020 Lua.org, PUC-Rio.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
******************************************************************************/
#endif
// lua.hpp
// Lua header files for C++
// <<extern "C">> not supplied automatically because Lua also compiles as C++
extern "C" {
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
#include "_native_lua_config.h" /* native Lua */
}
/*
** $Id: lua.c $
** Lua stand-alone interpreter
** See Copyright Notice in lua.h
*/
#define lua_c
#include "lprefix.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "_native_lua_config.h" /* native Lua */
#if !defined(LUA_PROGNAME)
#define LUA_PROGNAME "lua"
#endif
#if !defined(LUA_INIT_VAR)
#define LUA_INIT_VAR "LUA_INIT"
#endif
#define LUA_INITVARVERSION LUA_INIT_VAR LUA_VERSUFFIX
static lua_State *globalL = NULL;
static const char *progname = LUA_PROGNAME;
/*
** Hook set by signal function to stop the interpreter.
*/
static void lstop (lua_State *L, lua_Debug *ar) {
(void)ar; /* unused arg. */
lua_sethook(L, NULL, 0, 0); /* reset hook */
luaL_error(L, "interrupted!");
}
/*
** Function to be called at a C signal. Because a C signal cannot
** just change a Lua state (as there is no proper synchronization),
** this function only sets a hook that, when called, will stop the
** interpreter.
*/
static void laction (int i) {
int flag = LUA_MASKCALL | LUA_MASKRET | LUA_MASKLINE | LUA_MASKCOUNT;
signal(i, SIG_DFL); /* if another SIGINT happens, terminate process */
lua_sethook(globalL, lstop, flag, 1);
}
static void print_usage (const char *badoption) {
lua_writestringerror("%s: ", progname);
if (badoption[1] == 'e' || badoption[1] == 'l')
lua_writestringerror("'%s' needs argument\n", badoption);
else
lua_writestringerror("unrecognized option '%s'\n", badoption);
lua_writestringerror(
"usage: %s [options] [script [args]]\n"
"Available options are:\n"
" -e stat execute string 'stat'\n"
" -i enter interactive mode after executing 'script'\n"
" -l name require library 'name' into global 'name'\n"
" -v show version information\n"
" -E ignore environment variables\n"
" -W turn warnings on\n"
" -- stop handling options\n"
" - stop handling options and execute stdin\n"
,
progname);
}
/*
** Prints an error message, adding the program name in front of it
** (if present)
*/
static void l_message (const char *pname, const char *msg) {
if (pname) lua_writestringerror("%s: ", pname);
lua_writestringerror("%s\n", msg);
}
/*
** Check whether 'status' is not OK and, if so, prints the error
** message on the top of the stack. It assumes that the error object
** is a string, as it was either generated by Lua or by 'msghandler'.
*/
static int report (lua_State *L, int status) {
if (status != LUA_OK) {
const char *msg = lua_tostring(L, -1);
l_message(progname, msg);
lua_pop(L, 1); /* remove message */
}
return status;
}
/*
** Message handler used to run all chunks
*/
static int msghandler (lua_State *L) {
const char *msg = lua_tostring(L, 1);
if (msg == NULL) { /* is error object not a string? */
if (luaL_callmeta(L, 1, "__tostring") && /* does it have a metamethod */
lua_type(L, -1) == LUA_TSTRING) /* that produces a string? */
return 1; /* that is the message */
else
msg = lua_pushfstring(L, "(error object is a %s value)",
luaL_typename(L, 1));
}
luaL_traceback(L, L, msg, 1); /* append a standard traceback */
return 1; /* return the traceback */
}
/*
** Interface to 'lua_pcall', which sets appropriate message function
** and C-signal handler. Used to run all chunks.
*/
static int docall (lua_State *L, int narg, int nres) {
int status;
int base = lua_gettop(L) - narg; /* function index */
lua_pushcfunction(L, msghandler); /* push message handler */
lua_insert(L, base); /* put it under function and args */
globalL = L; /* to be available to 'laction' */
signal(SIGINT, laction); /* set C-signal handler */
status = lua_pcall(L, narg, nres, base);
signal(SIGINT, SIG_DFL); /* reset C-signal handler */
lua_remove(L, base); /* remove message handler from the stack */
return status;
}
static void print_version (void) {
lua_writestring(LUA_COPYRIGHT, strlen(LUA_COPYRIGHT));
lua_writestring(NATIVE_LUA_MSG, strlen(NATIVE_LUA_MSG)); /* native Lua */
lua_writeline();
}
/*
** Create the 'arg' table, which stores all arguments from the
** command line ('argv'). It should be aligned so that, at index 0,
** it has 'argv[script]', which is the script name. The arguments
** to the script (everything after 'script') go to positive indices;
** other arguments (before the script name) go to negative indices.
** If there is no script name, assume interpreter's name as base.
*/
static void createargtable (lua_State *L, char **argv, int argc, int script) {
int i, narg;
if (script == argc) script = 0; /* no script name? */
narg = argc - (script + 1); /* number of positive indices */
lua_createtable(L, narg, script + 1);
for (i = 0; i < argc; i++) {
lua_pushstring(L, argv[i]);
lua_rawseti(L, -2, i - script);
}
lua_setglobal(L, "arg");
}
static int dochunk (lua_State *L, int status) {
if (status == LUA_OK) status = docall(L, 0, 0);
return report(L, status);
}
static int dofile (lua_State *L, const char *name) {
return dochunk(L, luaL_loadfile(L, name));
}
static int dostring (lua_State *L, const char *s, const char *name) {
return dochunk(L, luaL_loadbuffer(L, s, strlen(s), name));
}
/*
** Calls 'require(name)' and stores the result in a global variable
** with the given name.
*/
static int dolibrary (lua_State *L, const char *name) {
int status;
lua_getglobal(L, "require");
lua_pushstring(L, name);
status = docall(L, 1, 1); /* call 'require(name)' */
if (status == LUA_OK)
lua_setglobal(L, name); /* global[name] = require return */
return report(L, status);
}
/*
** Push on the stack the contents of table 'arg' from 1 to #arg
*/
static int pushargs (lua_State *L) {
int i, n;
if (lua_getglobal(L, "arg") != LUA_TTABLE)
luaL_error(L, "'arg' is not a table");
n = (int)luaL_len(L, -1);
luaL_checkstack(L, n + 3, "too many arguments to script");
for (i = 1; i <= n; i++)
lua_rawgeti(L, -i, i);
lua_remove(L, -i); /* remove table from the stack */
return n;
}
static int handle_script (lua_State *L, char **argv) {
int status;
const char *fname = argv[0];
if (strcmp(fname, "-") == 0 && strcmp(argv[-1], "--") != 0)
fname = NULL; /* stdin */
status = luaL_loadfile(L, fname);
if (status == LUA_OK) {
int n = pushargs(L); /* push arguments to script */
status = docall(L, n, LUA_MULTRET);
}
return report(L, status);
}
/* bits of various argument indicators in 'args' */
#define has_error 1 /* bad option */
#define has_i 2 /* -i */
#define has_v 4 /* -v */
#define has_e 8 /* -e */
#define has_E 16 /* -E */
/*
** Traverses all arguments from 'argv', returning a mask with those
** needed before running any Lua code (or an error code if it finds
** any invalid argument). 'first' returns the first not-handled argument
** (either the script name or a bad argument in case of error).
*/
static int collectargs (char **argv, int *first) {
int args = 0;
int i;
for (i = 1; argv[i] != NULL; i++) {
*first = i;
if (argv[i][0] != '-') /* not an option? */
return args; /* stop handling options */
switch (argv[i][1]) { /* else check option */
case '-': /* '--' */
if (argv[i][2] != '\0') /* extra characters after '--'? */
return has_error; /* invalid option */
*first = i + 1;
return args;
case '\0': /* '-' */
return args; /* script "name" is '-' */
case 'E':
if (argv[i][2] != '\0') /* extra characters? */
return has_error; /* invalid option */
args |= has_E;
break;
case 'W':
if (argv[i][2] != '\0') /* extra characters? */
return has_error; /* invalid option */
break;
case 'i':
args |= has_i; /* (-i implies -v) *//* FALLTHROUGH */
case 'v':
if (argv[i][2] != '\0') /* extra characters? */
return has_error; /* invalid option */
args |= has_v;
break;
case 'e':
args |= has_e; /* FALLTHROUGH */
case 'l': /* both options need an argument */
if (argv[i][2] == '\0') { /* no concatenated argument? */
i++; /* try next 'argv' */
if (argv[i] == NULL || argv[i][0] == '-')
return has_error; /* no next argument or it is another option */
}
break;
default: /* invalid option */
return has_error;
}
}
*first = i; /* no script name */
return args;
}
/*
** Processes options 'e' and 'l', which involve running Lua code, and
** 'W', which also affects the state.
** Returns 0 if some code raises an error.
*/
static int runargs (lua_State *L, char **argv, int n) {
int i;
for (i = 1; i < n; i++) {
int option = argv[i][1];
lua_assert(argv[i][0] == '-'); /* already checked */
switch (option) {
case 'e': case 'l': {
int status;
const char *extra = argv[i] + 2; /* both options need an argument */
if (*extra == '\0') extra = argv[++i];
lua_assert(extra != NULL);
status = (option == 'e')
? dostring(L, extra, "=(command line)")
: dolibrary(L, extra);
if (status != LUA_OK) return 0;
break;
}
case 'W':
lua_warning(L, "@on", 0); /* warnings on */
break;
}
}
return 1;
}
static int handle_luainit (lua_State *L) {
const char *name = "=" LUA_INITVARVERSION;
const char *init = getenv(name + 1);
if (init == NULL) {
name = "=" LUA_INIT_VAR;
init = getenv(name + 1); /* try alternative name */
}
if (init == NULL) return LUA_OK;
else if (init[0] == '@')
return dofile(L, init+1);
else
return dostring(L, init, name);
}
/*
** {==================================================================
** Read-Eval-Print Loop (REPL)
** ===================================================================
*/
#if !defined(LUA_PROMPT)
#define LUA_PROMPT "> "
#define LUA_PROMPT2 ">> "
#endif
#if !defined(LUA_MAXINPUT)
#define LUA_MAXINPUT 512
#endif
/*
** lua_stdin_is_tty detects whether the standard input is a 'tty' (that
** is, whether we're running lua interactively).
*/
#if !defined(lua_stdin_is_tty) /* { */
#if defined(LUA_USE_POSIX) /* { */
#include <unistd.h>
#define lua_stdin_is_tty() isatty(0)
#elif defined(LUA_USE_WINDOWS) /* }{ */
#include <io.h>
#include <windows.h>
#define lua_stdin_is_tty() _isatty(_fileno(stdin))
#else /* }{ */
/* ISO C definition */
#define lua_stdin_is_tty() 1 /* assume stdin is a tty */
#endif /* } */
#endif /* } */
/*
** lua_readline defines how to show a prompt and then read a line from
** the standard input.
** lua_saveline defines how to "save" a read line in a "history".
** lua_freeline defines how to free a line read by lua_readline.
*/
#if !defined(lua_readline) /* { */
#if defined(LUA_USE_READLINE) /* { */
#include <readline/readline.h>
#include <readline/history.h>
#define lua_initreadline(L) ((void)L, rl_readline_name="lua")
#define lua_readline(L,b,p) ((void)L, ((b)=readline(p)) != NULL)
#define lua_saveline(L,line) ((void)L, add_history(line))
#define lua_freeline(L,b) ((void)L, free(b))
#else /* }{ */
#define lua_initreadline(L) ((void)L)
#define lua_readline(L,b,p) \
((void)L, fputs(p, stdout), fflush(stdout), /* show prompt */ \
fgets(b, LUA_MAXINPUT, stdin) != NULL) /* get line */
#define lua_saveline(L,line) { (void)L; (void)line; }
#define lua_freeline(L,b) { (void)L; (void)b; }
#endif /* } */
#endif /* } */
/*
** Returns the string to be used as a prompt by the interpreter.
*/
static const char *get_prompt (lua_State *L, int firstline) {
const char *p;
lua_getglobal(L, firstline ? "_PROMPT" : "_PROMPT2");
p = lua_tostring(L, -1);
if (p == NULL) p = (firstline ? LUA_PROMPT : LUA_PROMPT2);
return p;
}
/* mark in error messages for incomplete statements */
#define EOFMARK "<eof>"
#define marklen (sizeof(EOFMARK)/sizeof(char) - 1)
/*
** Check whether 'status' signals a syntax error and the error
** message at the top of the stack ends with the above mark for
** incomplete statements.
*/
static int incomplete (lua_State *L, int status) {
if (status == LUA_ERRSYNTAX) {
size_t lmsg;
const char *msg = lua_tolstring(L, -1, &lmsg);
if (lmsg >= marklen && strcmp(msg + lmsg - marklen, EOFMARK) == 0) {
lua_pop(L, 1);
return 1;
}
}
return 0; /* else... */
}
/*
** Prompt the user, read a line, and push it into the Lua stack.
*/
static int pushline (lua_State *L, int firstline) {
char buffer[LUA_MAXINPUT];
char *b = buffer;
size_t l;
const char *prmt = get_prompt(L, firstline);
int readstatus = lua_readline(L, b, prmt);
if (readstatus == 0)
return 0; /* no input (prompt will be popped by caller) */
lua_pop(L, 1); /* remove prompt */
l = strlen(b);
if (l > 0 && b[l-1] == '\n') /* line ends with newline? */
b[--l] = '\0'; /* remove it */
if (firstline && b[0] == '=') /* for compatibility with 5.2, ... */
lua_pushfstring(L, "return %s", b + 1); /* change '=' to 'return' */
else
lua_pushlstring(L, b, l);
lua_freeline(L, b);
return 1;
}
/*
** Try to compile line on the stack as 'return <line>;'; on return, stack
** has either compiled chunk or original line (if compilation failed).
*/
static int addreturn (lua_State *L) {
const char *line = lua_tostring(L, -1); /* original line */
const char *retline = lua_pushfstring(L, "return %s;", line);
int status = luaL_loadbuffer(L, retline, strlen(retline), "=stdin");
if (status == LUA_OK) {
lua_remove(L, -2); /* remove modified line */
if (line[0] != '\0') /* non empty? */
lua_saveline(L, line); /* keep history */
}
else
lua_pop(L, 2); /* pop result from 'luaL_loadbuffer' and modified line */
return status;
}
/*
** Read multiple lines until a complete Lua statement
*/
static int multiline (lua_State *L) {
for (;;) { /* repeat until gets a complete statement */
size_t len;
const char *line = lua_tolstring(L, 1, &len); /* get what it has */
int status = luaL_loadbuffer(L, line, len, "=stdin"); /* try it */
if (!incomplete(L, status) || !pushline(L, 0)) {
lua_saveline(L, line); /* keep history */
return status; /* cannot or should not try to add continuation line */
}
lua_pushliteral(L, "\n"); /* add newline... */
lua_insert(L, -2); /* ...between the two lines */
lua_concat(L, 3); /* join them */
}
}
/*
** Read a line and try to load (compile) it first as an expression (by
** adding "return " in front of it) and second as a statement. Return
** the final status of load/call with the resulting function (if any)
** in the top of the stack.
*/
static int loadline (lua_State *L) {
int status;
lua_settop(L, 0);
if (!pushline(L, 1))
return -1; /* no input */
if ((status = addreturn(L)) != LUA_OK) /* 'return ...' did not work? */
status = multiline(L); /* try as command, maybe with continuation lines */
lua_remove(L, 1); /* remove line from the stack */
lua_assert(lua_gettop(L) == 1);
return status;
}
/*
** Prints (calling the Lua 'print' function) any values on the stack
*/
static void l_print (lua_State *L) {
int n = lua_gettop(L);
if (n > 0) { /* any result to be printed? */
luaL_checkstack(L, LUA_MINSTACK, "too many results to print");
lua_getglobal(L, "print");
lua_insert(L, 1);
if (lua_pcall(L, n, 0, 0) != LUA_OK)
l_message(progname, lua_pushfstring(L, "error calling 'print' (%s)",
lua_tostring(L, -1)));
}
}
/*
** Do the REPL: repeatedly read (load) a line, evaluate (call) it, and
** print any results.
*/
static void doREPL (lua_State *L) {
int status;
const char *oldprogname = progname;
progname = NULL; /* no 'progname' on errors in interactive mode */
lua_initreadline(L);
while ((status = loadline(L)) != -1) {
if (status == LUA_OK)
status = docall(L, 0, LUA_MULTRET);
if (status == LUA_OK) l_print(L);
else report(L, status);
}
lua_settop(L, 0); /* clear stack */
lua_writeline();
progname = oldprogname;
}
/* }================================================================== */
/*
** Main body of stand-alone interpreter (to be called in protected mode).
** Reads the options and handles them all.
*/
static int pmain (lua_State *L) {
int argc = (int)lua_tointeger(L, 1);
char **argv = (char **)lua_touserdata(L, 2);
int script;
int args = collectargs(argv, &script);
luaL_checkversion(L); /* check that interpreter has correct version */
if (argv[0] && argv[0][0]) progname = argv[0];
if (args == has_error) { /* bad arg? */
print_usage(argv[script]); /* 'script' has index of bad arg. */
return 0;
}
if (args & has_v) /* option '-v'? */
print_version();
if (args & has_E) { /* option '-E'? */
lua_pushboolean(L, 1); /* signal for libraries to ignore env. vars. */
lua_setfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");
}
luaL_openlibs(L); /* open standard libraries */
createargtable(L, argv, argc, script); /* create table 'arg' */
lua_gc(L, LUA_GCGEN, 0, 0); /* GC in generational mode */
if (!(args & has_E)) { /* no option '-E'? */
if (handle_luainit(L) != LUA_OK) /* run LUA_INIT */
return 0; /* error running LUA_INIT */
}
if (!runargs(L, argv, script)) /* execute arguments -e and -l */
return 0; /* something failed */
if (script < argc && /* execute main script (if there is one) */
handle_script(L, argv + script) != LUA_OK)
return 0;
if (args & has_i) /* -i option? */
doREPL(L); /* do read-eval-print loop */
else if (script == argc && !(args & (has_e | has_v))) { /* no arguments? */
if (lua_stdin_is_tty()) { /* running in interactive mode? */
print_version();
doREPL(L); /* do read-eval-print loop */
}
else dofile(L, NULL); /* executes stdin as a file */
}
lua_pushboolean(L, 1); /* signal no errors */
return 1;
}
int main (int argc, char **argv) {
int status, result;
lua_State *L = luaL_newstate(); /* create state */
if (L == NULL) {
l_message(argv[0], "cannot create state: not enough memory");
return EXIT_FAILURE;
}
lua_pushcfunction(L, &pmain); /* to call 'pmain' in protected mode */
lua_pushinteger(L, argc); /* 1st argument */
lua_pushlightuserdata(L, argv); /* 2nd argument */
status = lua_pcall(L, 2, 1, 0); /* do the call */
result = lua_toboolean(L, -1); /* get result */
report(L, status);
lua_close(L);
return (result && status == LUA_OK) ? EXIT_SUCCESS : EXIT_FAILURE;
}
LUAC¶
/*
** $Id: luac.c $
** Lua compiler (saves bytecodes to files; also lists bytecodes)
** See Copyright Notice in lua.h
*/
#define luac_c
#define LUA_CORE
#include "lprefix.h"
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lua.h"
#include "lauxlib.h"
#include "ldebug.h"
#include "lobject.h"
#include "lopcodes.h"
#include "lopnames.h"
#include "lstate.h"
#include "lundump.h"
#include "_native_lua_config.h" /* native Lua */
static void PrintFunction(const Proto* f, int full);
#define luaU_print PrintFunction
#define PROGNAME "luac" /* default program name */
#define OUTPUT PROGNAME ".out" /* default output file */
static int listing=0; /* list bytecodes? */
static int dumping=1; /* dump bytecodes? */
static int stripping=0; /* strip debug information? */
static char Output[]={ OUTPUT }; /* default output file name */
static const char* output=Output; /* actual output file name */
static const char* progname=PROGNAME; /* actual program name */
static TString **tmname;
static void fatal(const char* message)
{
fprintf(stderr,"%s: %s\n",progname,message);
exit(EXIT_FAILURE);
}
static void cannot(const char* what)
{
fprintf(stderr,"%s: cannot %s %s: %s\n",progname,what,output,strerror(errno));
exit(EXIT_FAILURE);
}
static void usage(const char* message)
{
if (*message=='-')
fprintf(stderr,"%s: unrecognized option '%s'\n",progname,message);
else
fprintf(stderr,"%s: %s\n",progname,message);
fprintf(stderr,
"usage: %s [options] [filenames]\n"
"Available options are:\n"
" -l list (use -l -l for full listing)\n"
" -o name output to file 'name' (default is \"%s\")\n"
" -p parse only\n"
" -s strip debug information\n"
" -v show version information\n"
" -- stop handling options\n"
" - stop handling options and process stdin\n"
,progname,Output);
exit(EXIT_FAILURE);
}
#define IS(s) (strcmp(argv[i],s)==0)
static int doargs(int argc, char* argv[])
{
int i;
int version=0;
if (argv[0]!=NULL && *argv[0]!=0) progname=argv[0];
for (i=1; i<argc; i++)
{
if (*argv[i]!='-') /* end of options; keep it */
break;
else if (IS("--")) /* end of options; skip it */
{
++i;
if (version) ++version;
break;
}
else if (IS("-")) /* end of options; use stdin */
break;
else if (IS("-l")) /* list */
++listing;
else if (IS("-o")) /* output file */
{
output=argv[++i];
if (output==NULL || *output==0 || (*output=='-' && output[1]!=0))
usage("'-o' needs argument");
if (IS("-")) output=NULL;
}
else if (IS("-p")) /* parse only */
dumping=0;
else if (IS("-s")) /* strip debug information */
stripping=1;
else if (IS("-v")) /* show version */
++version;
else /* unknown option */
usage(argv[i]);
}
if (i==argc && (listing || !dumping))
{
dumping=0;
argv[--i]=Output;
}
if (version)
{
printf("%s",LUA_COPYRIGHT); /* native Lua */
printf("%s\n",NATIVE_LUA_MSG); /* native Lua */
if (version==argc-1) exit(EXIT_SUCCESS);
}
return i;
}
#define FUNCTION "(function()end)();"
static const char* reader(lua_State* L, void* ud, size_t* size)
{
UNUSED(L);
if ((*(int*)ud)--)
{
*size=sizeof(FUNCTION)-1;
return FUNCTION;
}
else
{
*size=0;
return NULL;
}
}
#define toproto(L,i) getproto(s2v(L->top+(i)))
static const Proto* combine(lua_State* L, int n)
{
if (n==1)
return toproto(L,-1);
else
{
Proto* f;
int i=n;
if (lua_load(L,reader,&i,"=(" PROGNAME ")",NULL)!=LUA_OK) fatal(lua_tostring(L,-1));
f=toproto(L,-1);
for (i=0; i<n; i++)
{
f->p[i]=toproto(L,i-n-1);
if (f->p[i]->sizeupvalues>0) f->p[i]->upvalues[0].instack=0;
}
f->sizelineinfo=0;
return f;
}
}
static int writer(lua_State* L, const void* p, size_t size, void* u)
{
UNUSED(L);
return (fwrite(p,size,1,(FILE*)u)!=1) && (size!=0);
}
static int pmain(lua_State* L)
{
int argc=(int)lua_tointeger(L,1);
char** argv=(char**)lua_touserdata(L,2);
const Proto* f;
int i;
tmname=G(L)->tmname;
if (!lua_checkstack(L,argc)) fatal("too many input files");
for (i=0; i<argc; i++)
{
const char* filename=IS("-") ? NULL : argv[i];
if (luaL_loadfile(L,filename)!=LUA_OK) fatal(lua_tostring(L,-1));
}
f=combine(L,argc);
if (listing) luaU_print(f,listing>1);
if (dumping)
{
FILE* D= (output==NULL) ? stdout : fopen(output,"wb");
if (D==NULL) cannot("open");
lua_lock(L);
luaU_dump(L,f,writer,D,stripping);
lua_unlock(L);
if (ferror(D)) cannot("write");
if (fclose(D)) cannot("close");
}
return 0;
}
int main(int argc, char* argv[])
{
lua_State* L;
int i=doargs(argc,argv);
argc-=i; argv+=i;
if (argc<=0) usage("no input files given");
L=luaL_newstate();
if (L==NULL) fatal("cannot create state: not enough memory");
lua_pushcfunction(L,&pmain);
lua_pushinteger(L,argc);
lua_pushlightuserdata(L,argv);
if (lua_pcall(L,2,0,0)!=LUA_OK) fatal(lua_tostring(L,-1));
lua_close(L);
return EXIT_SUCCESS;
}
/*
** print bytecodes
*/
#define UPVALNAME(x) ((f->upvalues[x].name) ? getstr(f->upvalues[x].name) : "-")
#define VOID(p) ((const void*)(p))
#define eventname(i) (getstr(tmname[i]))
static void PrintString(const TString* ts)
{
const char* s=getstr(ts);
size_t i,n=tsslen(ts);
printf("\"");
for (i=0; i<n; i++)
{
int c=(int)(unsigned char)s[i];
switch (c)
{
case '"':
printf("\\\"");
break;
case '\\':
printf("\\\\");
break;
case '\a':
printf("\\a");
break;
case '\b':
printf("\\b");
break;
case '\f':
printf("\\f");
break;
case '\n':
printf("\\n");
break;
case '\r':
printf("\\r");
break;
case '\t':
printf("\\t");
break;
case '\v':
printf("\\v");
break;
default:
if (isprint(c)) printf("%c",c); else printf("\\%03d",c);
break;
}
}
printf("\"");
}
static void PrintType(const Proto* f, int i)
{
const TValue* o=&f->k[i];
switch (ttypetag(o))
{
case LUA_VNIL:
printf("N");
break;
case LUA_VFALSE:
case LUA_VTRUE:
printf("B");
break;
case LUA_VNUMFLT:
printf("F");
break;
case LUA_VNUMINT:
printf("I");
break;
case LUA_VSHRSTR:
case LUA_VLNGSTR:
printf("S");
break;
default: /* cannot happen */
printf("?%d",ttypetag(o));
break;
}
printf("\t");
}
static void PrintConstant(const Proto* f, int i)
{
const TValue* o=&f->k[i];
switch (ttypetag(o))
{
case LUA_VNIL:
printf("nil");
break;
case LUA_VFALSE:
printf("false");
break;
case LUA_VTRUE:
printf("true");
break;
case LUA_VNUMFLT:
{
char buff[100];
sprintf(buff,LUA_NUMBER_FMT,fltvalue(o));
printf("%s",buff);
if (buff[strspn(buff,"-0123456789")]=='\0') printf(".0");
break;
}
case LUA_VNUMINT:
printf(LUA_INTEGER_FMT,ivalue(o));
break;
case LUA_VSHRSTR:
case LUA_VLNGSTR:
PrintString(tsvalue(o));
break;
default: /* cannot happen */
printf("?%d",ttypetag(o));
break;
}
}
#define COMMENT "\t; "
#define EXTRAARG GETARG_Ax(code[pc+1])
#define EXTRAARGC (EXTRAARG*(MAXARG_C+1))
#define ISK (isk ? "k" : "")
static void PrintCode(const Proto* f)
{
const Instruction* code=f->code;
int pc,n=f->sizecode;
for (pc=0; pc<n; pc++)
{
Instruction i=code[pc];
OpCode o=GET_OPCODE(i);
int a=GETARG_A(i);
int b=GETARG_B(i);
int c=GETARG_C(i);
int ax=GETARG_Ax(i);
int bx=GETARG_Bx(i);
int sb=GETARG_sB(i);
int sc=GETARG_sC(i);
int sbx=GETARG_sBx(i);
int isk=GETARG_k(i);
int line=luaG_getfuncline(f,pc);
printf("\t%d\t",pc+1);
if (line>0) printf("[%d]\t",line); else printf("[-]\t");
printf("%-9s\t",opnames[o]);
switch (o)
{
case OP_MOVE:
printf("%d %d",a,b);
break;
case OP_LOADI:
printf("%d %d",a,sbx);
break;
case OP_LOADF:
printf("%d %d",a,sbx);
break;
case OP_LOADK:
printf("%d %d",a,bx);
printf(COMMENT); PrintConstant(f,bx);
break;
case OP_LOADKX:
printf("%d",a);
printf(COMMENT); PrintConstant(f,EXTRAARG);
break;
case OP_LOADFALSE:
printf("%d",a);
break;
case OP_LFALSESKIP:
printf("%d",a);
break;
case OP_LOADTRUE:
printf("%d",a);
break;
case OP_LOADNIL:
printf("%d %d",a,b);
printf(COMMENT "%d out",b+1);
break;
case OP_GETUPVAL:
printf("%d %d",a,b);
printf(COMMENT "%s",UPVALNAME(b));
break;
case OP_SETUPVAL:
printf("%d %d",a,b);
printf(COMMENT "%s",UPVALNAME(b));
break;
case OP_GETTABUP:
printf("%d %d %d",a,b,c);
printf(COMMENT "%s",UPVALNAME(b));
printf(" "); PrintConstant(f,c);
break;
case OP_GETTABLE:
printf("%d %d %d",a,b,c);
break;
case OP_GETI:
printf("%d %d %d",a,b,c);
break;
case OP_GETFIELD:
printf("%d %d %d",a,b,c);
printf(COMMENT); PrintConstant(f,c);
break;
case OP_SETTABUP:
printf("%d %d %d%s",a,b,c,ISK);
printf(COMMENT "%s",UPVALNAME(a));
printf(" "); PrintConstant(f,b);
if (isk) { printf(" "); PrintConstant(f,c); }
break;
case OP_SETTABLE:
printf("%d %d %d%s",a,b,c,ISK);
if (isk) { printf(COMMENT); PrintConstant(f,c); }
break;
case OP_SETI:
printf("%d %d %d%s",a,b,c,ISK);
if (isk) { printf(COMMENT); PrintConstant(f,c); }
break;
case OP_SETFIELD:
printf("%d %d %d%s",a,b,c,ISK);
printf(COMMENT); PrintConstant(f,b);
if (isk) { printf(" "); PrintConstant(f,c); }
break;
case OP_NEWTABLE:
printf("%d %d %d",a,b,c);
printf(COMMENT "%d",c+EXTRAARGC);
break;
case OP_SELF:
printf("%d %d %d%s",a,b,c,ISK);
if (isk) { printf(COMMENT); PrintConstant(f,c); }
break;
case OP_ADDI:
printf("%d %d %d",a,b,sc);
break;
case OP_ADDK:
printf("%d %d %d",a,b,c);
printf(COMMENT); PrintConstant(f,c);
break;
case OP_SUBK:
printf("%d %d %d",a,b,c);
printf(COMMENT); PrintConstant(f,c);
break;
case OP_MULK:
printf("%d %d %d",a,b,c);
printf(COMMENT); PrintConstant(f,c);
break;
case OP_MODK:
printf("%d %d %d",a,b,c);
printf(COMMENT); PrintConstant(f,c);
break;
case OP_POWK:
printf("%d %d %d",a,b,c);
printf(COMMENT); PrintConstant(f,c);
break;
case OP_DIVK:
printf("%d %d %d",a,b,c);
printf(COMMENT); PrintConstant(f,c);
break;
case OP_IDIVK:
printf("%d %d %d",a,b,c);
printf(COMMENT); PrintConstant(f,c);
break;
case OP_BANDK:
printf("%d %d %d",a,b,c);
printf(COMMENT); PrintConstant(f,c);
break;
case OP_BORK:
printf("%d %d %d",a,b,c);
printf(COMMENT); PrintConstant(f,c);
break;
case OP_BXORK:
printf("%d %d %d",a,b,c);
printf(COMMENT); PrintConstant(f,c);
break;
case OP_SHRI:
printf("%d %d %d",a,b,sc);
break;
case OP_SHLI:
printf("%d %d %d",a,b,sc);
break;
case OP_ADD:
printf("%d %d %d",a,b,c);
break;
case OP_SUB:
printf("%d %d %d",a,b,c);
break;
case OP_MUL:
printf("%d %d %d",a,b,c);
break;
case OP_MOD:
printf("%d %d %d",a,b,c);
break;
case OP_POW:
printf("%d %d %d",a,b,c);
break;
case OP_DIV:
printf("%d %d %d",a,b,c);
break;
case OP_IDIV:
printf("%d %d %d",a,b,c);
break;
case OP_BAND:
printf("%d %d %d",a,b,c);
break;
case OP_BOR:
printf("%d %d %d",a,b,c);
break;
case OP_BXOR:
printf("%d %d %d",a,b,c);
break;
case OP_SHL:
printf("%d %d %d",a,b,c);
break;
case OP_SHR:
printf("%d %d %d",a,b,c);
break;
case OP_MMBIN:
printf("%d %d %d",a,b,c);
printf(COMMENT "%s",eventname(c));
break;
case OP_MMBINI:
printf("%d %d %d %d",a,sb,c,isk);
printf(COMMENT "%s",eventname(c));
if (isk) printf(" flip");
break;
case OP_MMBINK:
printf("%d %d %d %d",a,b,c,isk);
printf(COMMENT "%s ",eventname(c)); PrintConstant(f,b);
if (isk) printf(" flip");
break;
case OP_UNM:
printf("%d %d",a,b);
break;
case OP_BNOT:
printf("%d %d",a,b);
break;
case OP_NOT:
printf("%d %d",a,b);
break;
case OP_LEN:
printf("%d %d",a,b);
break;
case OP_CONCAT:
printf("%d %d",a,b);
break;
case OP_CLOSE:
printf("%d",a);
break;
case OP_TBC:
printf("%d",a);
break;
case OP_JMP:
printf("%d",GETARG_sJ(i));
printf(COMMENT "to %d",GETARG_sJ(i)+pc+2);
break;
case OP_EQ:
printf("%d %d %d",a,b,isk);
break;
case OP_LT:
printf("%d %d %d",a,b,isk);
break;
case OP_LE:
printf("%d %d %d",a,b,isk);
break;
case OP_EQK:
printf("%d %d %d",a,b,isk);
printf(COMMENT); PrintConstant(f,b);
break;
case OP_EQI:
printf("%d %d %d",a,sb,isk);
break;
case OP_LTI:
printf("%d %d %d",a,sb,isk);
break;
case OP_LEI:
printf("%d %d %d",a,sb,isk);
break;
case OP_GTI:
printf("%d %d %d",a,sb,isk);
break;
case OP_GEI:
printf("%d %d %d",a,sb,isk);
break;
case OP_TEST:
printf("%d %d",a,isk);
break;
case OP_TESTSET:
printf("%d %d %d",a,b,isk);
break;
case OP_CALL:
printf("%d %d %d",a,b,c);
printf(COMMENT);
if (b==0) printf("all in "); else printf("%d in ",b-1);
if (c==0) printf("all out"); else printf("%d out",c-1);
break;
case OP_TAILCALL:
printf("%d %d %d",a,b,c);
printf(COMMENT "%d in",b-1);
break;
case OP_RETURN:
printf("%d %d %d",a,b,c);
printf(COMMENT);
if (b==0) printf("all out"); else printf("%d out",b-1);
break;
case OP_RETURN0:
break;
case OP_RETURN1:
printf("%d",a);
break;
case OP_FORLOOP:
printf("%d %d",a,bx);
printf(COMMENT "to %d",pc-bx+2);
break;
case OP_FORPREP:
printf("%d %d",a,bx);
printf(COMMENT "to %d",pc+bx+2);
break;
case OP_TFORPREP:
printf("%d %d",a,bx);
printf(COMMENT "to %d",pc+bx+2);
break;
case OP_TFORCALL:
printf("%d %d",a,c);
break;
case OP_TFORLOOP:
printf("%d %d",a,bx);
printf(COMMENT "to %d",pc-bx+2);
break;
case OP_SETLIST:
printf("%d %d %d",a,b,c);
if (isk) printf(COMMENT "%d",c+EXTRAARGC);
break;
case OP_CLOSURE:
printf("%d %d",a,bx);
printf(COMMENT "%p",VOID(f->p[bx]));
break;
case OP_VARARG:
printf("%d %d",a,c);
printf(COMMENT);
if (c==0) printf("all out"); else printf("%d out",c-1);
break;
case OP_VARARGPREP:
printf("%d",a);
break;
case OP_EXTRAARG:
printf("%d",ax);
break;
#if 0
default:
printf("%d %d %d",a,b,c);
printf(COMMENT "not handled");
break;
#endif
}
printf("\n");
}
}
#define SS(x) ((x==1)?"":"s")
#define S(x) (int)(x),SS(x)
static void PrintHeader(const Proto* f)
{
const char* s=f->source ? getstr(f->source) : "=?";
if (*s=='@' || *s=='=')
s++;
else if (*s==LUA_SIGNATURE[0])
s="(bstring)";
else
s="(string)";
printf("\n%s <%s:%d,%d> (%d instruction%s at %p)\n",
(f->linedefined==0)?"main":"function",s,
f->linedefined,f->lastlinedefined,
S(f->sizecode),VOID(f));
printf("%d%s param%s, %d slot%s, %d upvalue%s, ",
(int)(f->numparams),f->is_vararg?"+":"",SS(f->numparams),
S(f->maxstacksize),S(f->sizeupvalues));
printf("%d local%s, %d constant%s, %d function%s\n",
S(f->sizelocvars),S(f->sizek),S(f->sizep));
}
static void PrintDebug(const Proto* f)
{
int i,n;
n=f->sizek;
printf("constants (%d) for %p:\n",n,VOID(f));
for (i=0; i<n; i++)
{
printf("\t%d\t",i);
PrintType(f,i);
PrintConstant(f,i);
printf("\n");
}
n=f->sizelocvars;
printf("locals (%d) for %p:\n",n,VOID(f));
for (i=0; i<n; i++)
{
printf("\t%d\t%s\t%d\t%d\n",
i,getstr(f->locvars[i].varname),f->locvars[i].startpc+1,f->locvars[i].endpc+1);
}
n=f->sizeupvalues;
printf("upvalues (%d) for %p:\n",n,VOID(f));
for (i=0; i<n; i++)
{
printf("\t%d\t%s\t%d\t%d\n",
i,UPVALNAME(i),f->upvalues[i].instack,f->upvalues[i].idx);
}
}
static void PrintFunction(const Proto* f, int full)
{
int i,n=f->sizep;
PrintHeader(f);
PrintCode(f);
if (full) PrintDebug(f);
for (i=0; i<n; i++) PrintFunction(f->p[i],full);
}
LUACONF¶
/*
** $Id: luaconf.h $
** Configuration file for Lua
** See Copyright Notice in lua.h
*/
#ifndef luaconf_h
#define luaconf_h
#include <limits.h>
#include <stddef.h>
#include "_native_lua_config.h" /* native Lua */
/*
** ===================================================================
** General Configuration File for Lua
**
** Some definitions here can be changed externally, through the
** compiler (e.g., with '-D' options). Those are protected by
** '#if !defined' guards. However, several other definitions should
** be changed directly here, either because they affect the Lua
** ABI (by making the changes here, you ensure that all software
** connected to Lua, such as C libraries, will be compiled with the
** same configuration); or because they are seldom changed.
**
** Search for "@@" to find all configurable definitions.
** ===================================================================
*/
/*
** {====================================================================
** System Configuration: macros to adapt (if needed) Lua to some
** particular platform, for instance restricting it to C89.
** =====================================================================
*/
/*
@@ LUAI_MAXCSTACK defines the maximum depth for nested calls and
** also limits the maximum depth of other recursive algorithms in
** the implementation, such as syntactic analysis. A value too
** large may allow the interpreter to crash (C-stack overflow).
** The default value seems ok for regular machines, but may be
** too high for restricted hardware.
** The test file 'cstack.lua' may help finding a good limit.
** (It will crash with a limit too high.)
*/
#if !defined(LUAI_MAXCSTACK)
#define LUAI_MAXCSTACK 2000
#endif
/*
@@ LUA_USE_C89 controls the use of non-ISO-C89 features.
** Define it if you want Lua to avoid the use of a few C99 features
** or Windows-specific features on Windows.
*/
/* #define LUA_USE_C89 */
/*
** By default, Lua on Windows use (some) specific Windows features
*/
#if !defined(LUA_USE_C89) && defined(_WIN32) && !defined(_WIN32_WCE)
#define LUA_USE_WINDOWS /* enable goodies for regular Windows */
#endif
#if defined(LUA_USE_WINDOWS)
#define LUA_DL_DLL /* enable support for DLL */
#define LUA_USE_C89 /* broadly, Windows is C89 */
#endif
#if defined(LUA_USE_LINUX)
#define LUA_USE_POSIX
#define LUA_USE_DLOPEN /* needs an extra library: -ldl */
#endif
#if defined(LUA_USE_MACOSX)
#define LUA_USE_POSIX
#define LUA_USE_DLOPEN /* MacOS does not need -ldl */
#endif
/*
@@ LUAI_IS32INT is true iff 'int' has (at least) 32 bits.
*/
#define LUAI_IS32INT ((UINT_MAX >> 30) >= 3)
/* }================================================================== */
/*
** {==================================================================
** Configuration for Number types.
** ===================================================================
*/
/*
@@ LUA_32BITS enables Lua with 32-bit integers and 32-bit floats.
*/
/* #define LUA_32BITS */
/*
@@ LUA_C89_NUMBERS ensures that Lua uses the largest types available for
** C89 ('long' and 'double'); Windows always has '__int64', so it does
** not need to use this case.
*/
#if defined(LUA_USE_C89) && !defined(LUA_USE_WINDOWS)
#define LUA_C89_NUMBERS
#endif
/*
@@ LUA_INT_TYPE defines the type for Lua integers.
@@ LUA_FLOAT_TYPE defines the type for Lua floats.
** Lua should work fine with any mix of these options supported
** by your C compiler. The usual configurations are 64-bit integers
** and 'double' (the default), 32-bit integers and 'float' (for
** restricted platforms), and 'long'/'double' (for C compilers not
** compliant with C99, which may not have support for 'long long').
*/
/* predefined options for LUA_INT_TYPE */
#define LUA_INT_INT 1
#define LUA_INT_LONG 2
#define LUA_INT_LONGLONG 3
/* predefined options for LUA_FLOAT_TYPE */
#define LUA_FLOAT_FLOAT 1
#define LUA_FLOAT_DOUBLE 2
#define LUA_FLOAT_LONGDOUBLE 3
#if defined(LUA_32BITS) /* { */
/*
** 32-bit integers and 'float'
*/
#if LUAI_IS32INT /* use 'int' if big enough */
#define LUA_INT_TYPE LUA_INT_INT
#else /* otherwise use 'long' */
#define LUA_INT_TYPE LUA_INT_LONG
#endif
#define LUA_FLOAT_TYPE LUA_FLOAT_FLOAT
#elif defined(LUA_C89_NUMBERS) /* }{ */
/*
** largest types available for C89 ('long' and 'double')
*/
#define LUA_INT_TYPE LUA_INT_LONG
#define LUA_FLOAT_TYPE LUA_FLOAT_DOUBLE
#endif /* } */
/*
** default configuration for 64-bit Lua ('long long' and 'double')
*/
#if !defined(LUA_INT_TYPE)
#define LUA_INT_TYPE LUA_INT_LONGLONG
#endif
#if !defined(LUA_FLOAT_TYPE)
#define LUA_FLOAT_TYPE LUA_FLOAT_DOUBLE
#endif
/* }================================================================== */
/*
** {==================================================================
** Configuration for Paths.
** ===================================================================
*/
/*
** LUA_PATH_SEP is the character that separates templates in a path.
** LUA_PATH_MARK is the string that marks the substitution points in a
** template.
** LUA_EXEC_DIR in a Windows path is replaced by the executable's
** directory.
*/
#define LUA_PATH_SEP ";"
#define LUA_PATH_MARK "?"
#define LUA_EXEC_DIR "!"
/*
@@ LUA_PATH_DEFAULT is the default path that Lua uses to look for
** Lua libraries.
@@ LUA_CPATH_DEFAULT is the default path that Lua uses to look for
** C libraries.
** CHANGE them if your machine has a non-conventional directory
** hierarchy or if you want to install your libraries in
** non-conventional directories.
*/
#define LUA_VDIR LUA_VERSION_MAJOR "." LUA_VERSION_MINOR
#if defined(_WIN32) /* { */
/*
** In Windows, any exclamation mark ('!') in the path is replaced by the
** path of the directory of the executable file of the current process.
*/
#define LUA_LDIR "!\\lua\\"
#define LUA_CDIR "!\\"
#define LUA_SHRDIR "!\\..\\share\\lua\\" LUA_VDIR "\\"
#if !defined(LUA_PATH_DEFAULT)
#define LUA_PATH_DEFAULT \
LUA_LDIR"?.lua;" LUA_LDIR"?\\init.lua;" \
LUA_CDIR"?.lua;" LUA_CDIR"?\\init.lua;" \
LUA_SHRDIR"?.lua;" LUA_SHRDIR"?\\init.lua;" \
".\\?.lua;" ".\\?\\init.lua"
#endif
#if !defined(LUA_CPATH_DEFAULT)
#define LUA_CPATH_DEFAULT \
LUA_CDIR"?.dll;" \
LUA_CDIR"..\\lib\\lua\\" LUA_VDIR "\\?.dll;" \
LUA_CDIR"loadall.dll;" ".\\?.dll"
#endif
#else /* }{ */
#define LUA_ROOT "/usr/local/"
#define LUA_LDIR LUA_ROOT "share/lua/" LUA_VDIR "/"
#define LUA_CDIR LUA_ROOT "lib/lua/" LUA_VDIR "/"
#if !defined(LUA_PATH_DEFAULT)
#define LUA_PATH_DEFAULT \
LUA_LDIR"?.lua;" LUA_LDIR"?/init.lua;" \
LUA_CDIR"?.lua;" LUA_CDIR"?/init.lua;" \
"./?.lua;" "./?/init.lua"
#endif
#if !defined(LUA_CPATH_DEFAULT)
#define LUA_CPATH_DEFAULT \
LUA_CDIR"?.so;" LUA_CDIR"loadall.so;" "./?.so"
#endif
#endif /* } */
/*
@@ LUA_DIRSEP is the directory separator (for submodules).
** CHANGE it if your machine does not use "/" as the directory separator
** and is not Windows. (On Windows Lua automatically uses "\".)
*/
#if !defined(LUA_DIRSEP)
#if defined(_WIN32)
#define LUA_DIRSEP "\\"
#else
#define LUA_DIRSEP "/"
#endif
#endif
/* }================================================================== */
/*
** {==================================================================
** Marks for exported symbols in the C code
** ===================================================================
*/
/*
@@ LUA_API is a mark for all core API functions.
@@ LUALIB_API is a mark for all auxiliary library functions.
@@ LUAMOD_API is a mark for all standard library opening functions.
** CHANGE them if you need to define those functions in some special way.
** For instance, if you want to create one Windows DLL with the core and
** the libraries, you may want to use the following definition (define
** LUA_BUILD_AS_DLL to get it).
*/
#if defined(LUA_BUILD_AS_DLL) /* { */
#if defined(LUA_CORE) || defined(LUA_LIB) /* { */
#define LUA_API __declspec(dllexport)
#else /* }{ */
#define LUA_API __declspec(dllimport)
#endif /* } */
#else /* }{ */
#define LUA_API extern
#endif /* } */
/*
** More often than not the libs go together with the core.
*/
#define LUALIB_API LUA_API
#define LUAMOD_API LUA_API
/*
@@ LUAI_FUNC is a mark for all extern functions that are not to be
** exported to outside modules.
@@ LUAI_DDEF and LUAI_DDEC are marks for all extern (const) variables,
** none of which to be exported to outside modules (LUAI_DDEF for
** definitions and LUAI_DDEC for declarations).
** CHANGE them if you need to mark them in some special way. Elf/gcc
** (versions 3.2 and later) mark them as "hidden" to optimize access
** when Lua is compiled as a shared library. Not all elf targets support
** this attribute. Unfortunately, gcc does not offer a way to check
** whether the target offers that support, and those without support
** give a warning about it. To avoid these warnings, change to the
** default definition.
*/
#if defined(__GNUC__) && ((__GNUC__*100 + __GNUC_MINOR__) >= 302) && \
defined(__ELF__) /* { */
#define LUAI_FUNC __attribute__((visibility("internal"))) extern
#else /* }{ */
#define LUAI_FUNC extern
#endif /* } */
#define LUAI_DDEC(dec) LUAI_FUNC dec
#define LUAI_DDEF /* empty */
/* }================================================================== */
/*
** {==================================================================
** Compatibility with previous versions
** ===================================================================
*/
/*
@@ LUA_COMPAT_5_3 controls other macros for compatibility with Lua 5.3.
** You can define it to get all options, or change specific options
** to fit your specific needs.
*/
#if defined(LUA_COMPAT_5_3) /* { */
/*
@@ LUA_COMPAT_MATHLIB controls the presence of several deprecated
** functions in the mathematical library.
** (These functions were already officially removed in 5.3;
** nevertheless they are still available here.)
*/
#define LUA_COMPAT_MATHLIB
/*
@@ LUA_COMPAT_APIINTCASTS controls the presence of macros for
** manipulating other integer types (lua_pushunsigned, lua_tounsigned,
** luaL_checkint, luaL_checklong, etc.)
** (These macros were also officially removed in 5.3, but they are still
** available here.)
*/
#define LUA_COMPAT_APIINTCASTS
/*
@@ LUA_COMPAT_LT_LE controls the emulation of the '__le' metamethod
** using '__lt'.
*/
#define LUA_COMPAT_LT_LE
/*
@@ The following macros supply trivial compatibility for some
** changes in the API. The macros themselves document how to
** change your code to avoid using them.
** (Once more, these macros were officially removed in 5.3, but they are
** still available here.)
*/
#define lua_strlen(L,i) lua_rawlen(L, (i))
#define lua_objlen(L,i) lua_rawlen(L, (i))
#define lua_equal(L,idx1,idx2) lua_compare(L,(idx1),(idx2),LUA_OPEQ)
#define lua_lessthan(L,idx1,idx2) lua_compare(L,(idx1),(idx2),LUA_OPLT)
#endif /* } */
/* }================================================================== */
/*
** {==================================================================
** Configuration for Numbers.
** Change these definitions if no predefined LUA_FLOAT_* / LUA_INT_*
** satisfy your needs.
** ===================================================================
*/
/*
@@ LUA_NUMBER is the floating-point type used by Lua.
@@ LUAI_UACNUMBER is the result of a 'default argument promotion'
@@ over a floating number.
@@ l_floatatt(x) corrects float attribute 'x' to the proper float type
** by prefixing it with one of FLT/DBL/LDBL.
@@ LUA_NUMBER_FRMLEN is the length modifier for writing floats.
@@ LUA_NUMBER_FMT is the format for writing floats.
@@ lua_number2str converts a float to a string.
@@ l_mathop allows the addition of an 'l' or 'f' to all math operations.
@@ l_floor takes the floor of a float.
@@ lua_str2number converts a decimal numeral to a number.
*/
/* The following definitions are good for most cases here */
#define l_floor(x) (l_mathop(floor)(x))
#define lua_number2str(s,sz,n) \
l_sprintf((s), sz, LUA_NUMBER_FMT, (LUAI_UACNUMBER)(n))
/*
@@ lua_numbertointeger converts a float number with an integral value
** to an integer, or returns 0 if float is not within the range of
** a lua_Integer. (The range comparisons are tricky because of
** rounding. The tests here assume a two-complement representation,
** where MININTEGER always has an exact representation as a float;
** MAXINTEGER may not have one, and therefore its conversion to float
** may have an ill-defined value.)
*/
#define lua_numbertointeger(n,p) \
((n) >= (LUA_NUMBER)(LUA_MININTEGER) && \
(n) < -(LUA_NUMBER)(LUA_MININTEGER) && \
(*(p) = (LUA_INTEGER)(n), 1))
/* now the variable definitions */
#if LUA_FLOAT_TYPE == LUA_FLOAT_FLOAT /* { single float */
#define LUA_NUMBER float
#define l_floatatt(n) (FLT_##n)
#define LUAI_UACNUMBER double
#define LUA_NUMBER_FRMLEN ""
#define LUA_NUMBER_FMT "%.7g"
#define l_mathop(op) op##f
#define lua_str2number(s,p) strtof((s), (p))
#elif LUA_FLOAT_TYPE == LUA_FLOAT_LONGDOUBLE /* }{ long double */
#define LUA_NUMBER long double
#define l_floatatt(n) (LDBL_##n)
#define LUAI_UACNUMBER long double
#define LUA_NUMBER_FRMLEN "L"
#define LUA_NUMBER_FMT "%.19Lg"
#define l_mathop(op) op##l
#define lua_str2number(s,p) strtold((s), (p))
#elif LUA_FLOAT_TYPE == LUA_FLOAT_DOUBLE /* }{ double */
#define LUA_NUMBER double
#define l_floatatt(n) (DBL_##n)
#define LUAI_UACNUMBER double
#define LUA_NUMBER_FRMLEN ""
#define LUA_NUMBER_FMT "%.14g"
#define l_mathop(op) op
#define lua_str2number(s,p) strtod((s), (p))
#else /* }{ */
#error "numeric float type not defined"
#endif /* } */
/*
@@ LUA_INTEGER is the integer type used by Lua.
**
@@ LUA_UNSIGNED is the unsigned version of LUA_INTEGER.
**
@@ LUAI_UACINT is the result of a 'default argument promotion'
@@ over a LUA_INTEGER.
@@ LUA_INTEGER_FRMLEN is the length modifier for reading/writing integers.
@@ LUA_INTEGER_FMT is the format for writing integers.
@@ LUA_MAXINTEGER is the maximum value for a LUA_INTEGER.
@@ LUA_MININTEGER is the minimum value for a LUA_INTEGER.
@@ LUA_MAXUNSIGNED is the maximum value for a LUA_UNSIGNED.
@@ LUA_UNSIGNEDBITS is the number of bits in a LUA_UNSIGNED.
@@ lua_integer2str converts an integer to a string.
*/
/* The following definitions are good for most cases here */
#define LUA_INTEGER_FMT "%" LUA_INTEGER_FRMLEN "d"
#define LUAI_UACINT LUA_INTEGER
#define lua_integer2str(s,sz,n) \
l_sprintf((s), sz, LUA_INTEGER_FMT, (LUAI_UACINT)(n))
/*
** use LUAI_UACINT here to avoid problems with promotions (which
** can turn a comparison between unsigneds into a signed comparison)
*/
#define LUA_UNSIGNED unsigned LUAI_UACINT
#define LUA_UNSIGNEDBITS (sizeof(LUA_UNSIGNED) * CHAR_BIT)
/* now the variable definitions */
#if LUA_INT_TYPE == LUA_INT_INT /* { int */
#define LUA_INTEGER int
#define LUA_INTEGER_FRMLEN ""
#define LUA_MAXINTEGER INT_MAX
#define LUA_MININTEGER INT_MIN
#define LUA_MAXUNSIGNED UINT_MAX
#elif LUA_INT_TYPE == LUA_INT_LONG /* }{ long */
#define LUA_INTEGER long
#define LUA_INTEGER_FRMLEN "l"
#define LUA_MAXINTEGER LONG_MAX
#define LUA_MININTEGER LONG_MIN
#define LUA_MAXUNSIGNED ULONG_MAX
#elif LUA_INT_TYPE == LUA_INT_LONGLONG /* }{ long long */
/* use presence of macro LLONG_MAX as proxy for C99 compliance */
#if defined(LLONG_MAX) /* { */
/* use ISO C99 stuff */
#define LUA_INTEGER long long
#define LUA_INTEGER_FRMLEN "ll"
#define LUA_MAXINTEGER LLONG_MAX
#define LUA_MININTEGER LLONG_MIN
#define LUA_MAXUNSIGNED ULLONG_MAX
#elif defined(LUA_USE_WINDOWS) /* }{ */
/* in Windows, can use specific Windows types */
#define LUA_INTEGER __int64
#define LUA_INTEGER_FRMLEN "I64"
#define LUA_MAXINTEGER _I64_MAX
#define LUA_MININTEGER _I64_MIN
#define LUA_MAXUNSIGNED _UI64_MAX
#else /* }{ */
#error "Compiler does not support 'long long'. Use option '-DLUA_32BITS' \
or '-DLUA_C89_NUMBERS' (see file 'luaconf.h' for details)"
#endif /* } */
#else /* }{ */
#error "numeric integer type not defined"
#endif /* } */
/* }================================================================== */
/*
** {==================================================================
** Dependencies with C99 and other C details
** ===================================================================
*/
/*
@@ l_sprintf is equivalent to 'snprintf' or 'sprintf' in C89.
** (All uses in Lua have only one format item.)
*/
#if !defined(LUA_USE_C89)
#define l_sprintf(s,sz,f,i) snprintf(s,sz,f,i)
#else
#define l_sprintf(s,sz,f,i) ((void)(sz), sprintf(s,f,i))
#endif
/*
@@ lua_strx2number converts a hexadecimal numeral to a number.
** In C99, 'strtod' does that conversion. Otherwise, you can
** leave 'lua_strx2number' undefined and Lua will provide its own
** implementation.
*/
#if !defined(LUA_USE_C89)
#define lua_strx2number(s,p) lua_str2number(s,p)
#endif
/*
@@ lua_pointer2str converts a pointer to a readable string in a
** non-specified way.
*/
#define lua_pointer2str(buff,sz,p) l_sprintf(buff,sz,"%p",p)
/*
@@ lua_number2strx converts a float to a hexadecimal numeral.
** In C99, 'sprintf' (with format specifiers '%a'/'%A') does that.
** Otherwise, you can leave 'lua_number2strx' undefined and Lua will
** provide its own implementation.
*/
#if !defined(LUA_USE_C89)
#define lua_number2strx(L,b,sz,f,n) \
((void)L, l_sprintf(b,sz,f,(LUAI_UACNUMBER)(n)))
#endif
/*
** 'strtof' and 'opf' variants for math functions are not valid in
** C89. Otherwise, the macro 'HUGE_VALF' is a good proxy for testing the
** availability of these variants. ('math.h' is already included in
** all files that use these macros.)
*/
#if defined(LUA_USE_C89) || (defined(HUGE_VAL) && !defined(HUGE_VALF))
#undef l_mathop /* variants not available */
#undef lua_str2number
#define l_mathop(op) (lua_Number)op /* no variant */
#define lua_str2number(s,p) ((lua_Number)strtod((s), (p)))
#endif
/*
@@ LUA_KCONTEXT is the type of the context ('ctx') for continuation
** functions. It must be a numerical type; Lua will use 'intptr_t' if
** available, otherwise it will use 'ptrdiff_t' (the nearest thing to
** 'intptr_t' in C89)
*/
#define LUA_KCONTEXT ptrdiff_t
#if !defined(LUA_USE_C89) && defined(__STDC_VERSION__) && \
__STDC_VERSION__ >= 199901L
#include <stdint.h>
#if defined(INTPTR_MAX) /* even in C99 this type is optional */
#undef LUA_KCONTEXT
#define LUA_KCONTEXT intptr_t
#endif
#endif
/*
@@ lua_getlocaledecpoint gets the locale "radix character" (decimal point).
** Change that if you do not want to use C locales. (Code using this
** macro must include the header 'locale.h'.)
*/
#if !defined(lua_getlocaledecpoint)
#define lua_getlocaledecpoint() (localeconv()->decimal_point[0])
#endif
/* }================================================================== */
/*
** {==================================================================
** Language Variations
** =====================================================================
*/
/*
@@ LUA_NOCVTN2S/LUA_NOCVTS2N control how Lua performs some
** coercions. Define LUA_NOCVTN2S to turn off automatic coercion from
** numbers to strings. Define LUA_NOCVTS2N to turn off automatic
** coercion from strings to numbers.
*/
/* #define LUA_NOCVTN2S */
/* #define LUA_NOCVTS2N */
/*
@@ LUA_USE_APICHECK turns on several consistency checks on the C API.
** Define it as a help when debugging C code.
*/
#if defined(LUA_USE_APICHECK)
#include <assert.h>
#define luai_apicheck(l,e) assert(e)
#endif
/* }================================================================== */
/*
** {==================================================================
** Macros that affect the API and must be stable (that is, must be the
** same when you compile Lua and when you compile code that links to
** Lua).
** =====================================================================
*/
/*
@@ LUAI_MAXSTACK limits the size of the Lua stack.
** CHANGE it if you need a different limit. This limit is arbitrary;
** its only purpose is to stop Lua from consuming unlimited stack
** space (and to reserve some numbers for pseudo-indices).
** (It must fit into max(size_t)/32.)
*/
#if LUAI_IS32INT
#define LUAI_MAXSTACK 1000000
#else
#define LUAI_MAXSTACK 15000
#endif
/*
@@ LUA_EXTRASPACE defines the size of a raw memory area associated with
** a Lua state with very fast access.
** CHANGE it if you need a different size.
*/
#define LUA_EXTRASPACE (sizeof(void *))
/*
@@ LUA_IDSIZE gives the maximum size for the description of the source
@@ of a function in debug information.
** CHANGE it if you want a different size.
*/
#define LUA_IDSIZE 60
/*
@@ LUAL_BUFFERSIZE is the buffer size used by the lauxlib buffer system.
*/
#define LUAL_BUFFERSIZE ((int)(16 * sizeof(void*) * sizeof(lua_Number)))
/*
@@ LUAI_MAXALIGN defines fields that, when used in a union, ensure
** maximum alignment for the other items in that union.
*/
#define LUAI_MAXALIGN lua_Number n; double u; void *s; lua_Integer i; long l
/* }================================================================== */
/* =================================================================== */
/*
** Local configuration. You can use this space to add your redefinitions
** without modifying the main part of the file.
*/
#endif
LUALIB¶
/*
** $Id: lualib.h $
** Lua standard libraries
** See Copyright Notice in lua.h
*/
#ifndef lualib_h
#define lualib_h
#include "lua.h"
#include "_native_lua_config.h" /* native Lua */
/* version suffix for environment variable names */
#define LUA_VERSUFFIX "_" LUA_VERSION_MAJOR "_" LUA_VERSION_MINOR
LUAMOD_API int (luaopen_base) (lua_State *L);
#define LUA_COLIBNAME "coroutine"
LUAMOD_API int (luaopen_coroutine) (lua_State *L);
#define LUA_TABLIBNAME "table"
LUAMOD_API int (luaopen_table) (lua_State *L);
#define LUA_IOLIBNAME "io"
LUAMOD_API int (luaopen_io) (lua_State *L);
#define LUA_OSLIBNAME "os"
LUAMOD_API int (luaopen_os) (lua_State *L);
#define LUA_STRLIBNAME "string"
LUAMOD_API int (luaopen_string) (lua_State *L);
#define LUA_UTF8LIBNAME "utf8"
LUAMOD_API int (luaopen_utf8) (lua_State *L);
#define LUA_MATHLIBNAME "math"
LUAMOD_API int (luaopen_math) (lua_State *L);
#define LUA_DBLIBNAME "debug"
LUAMOD_API int (luaopen_debug) (lua_State *L);
#define LUA_LOADLIBNAME "package"
LUAMOD_API int (luaopen_package) (lua_State *L);
/* open all previous libraries */
LUALIB_API void (luaL_openlibs) (lua_State *L);
#if !defined(lua_assert)
#define lua_assert(x) ((void)0)
#endif
#endif
LUNDUMP¶
/*
** $Id: lundump.h $
** load precompiled Lua chunks
** See Copyright Notice in lua.h
*/
#ifndef lundump_h
#define lundump_h
#include "llimits.h"
#include "lobject.h"
#include "lzio.h"
#include "_native_lua_config.h" /* native Lua */
/* data to catch conversion errors */
#define LUAC_DATA "\x19\x93\r\n\x1a\n"
#define LUAC_INT 0x5678
#define LUAC_NUM cast_num(370.5)
/*
** Encode major-minor version in one byte, one nibble for each
*/
#define MYINT(s) (s[0]-'0') /* assume one-digit numerals */
#define LUAC_VERSION (MYINT(LUA_VERSION_MAJOR)*16+MYINT(LUA_VERSION_MINOR))
#define LUAC_FORMAT 0 /* this is the official format */
/* load one chunk; from lundump.c */
LUAI_FUNC LClosure* luaU_undump (lua_State* L, ZIO* Z, const char* name);
/* dump one chunk; from ldump.c */
LUAI_FUNC int luaU_dump (lua_State* L, const Proto* f, lua_Writer w,
void* data, int strip);
#endif
/*
** $Id: lundump.c $
** load precompiled Lua chunks
** See Copyright Notice in lua.h
*/
#define lundump_c
#define LUA_CORE
#include "lprefix.h"
#include <limits.h>
#include <string.h>
#include "lua.h"
#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "lmem.h"
#include "lobject.h"
#include "lstring.h"
#include "lundump.h"
#include "lzio.h"
#if !defined(luai_verifycode)
#define luai_verifycode(L,f) /* empty */
#endif
typedef struct {
lua_State *L;
ZIO *Z;
const char *name;
} LoadState;
static l_noret error (LoadState *S, const char *why) {
luaO_pushfstring(S->L, "%s: bad binary format (%s)", S->name, why);
luaD_throw(S->L, LUA_ERRSYNTAX);
}
/*
** All high-level loads go through loadVector; you can change it to
** adapt to the endianness of the input
*/
#define loadVector(S,b,n) loadBlock(S,b,(n)*sizeof((b)[0]))
static void loadBlock (LoadState *S, void *b, size_t size) {
if (luaZ_read(S->Z, b, size) != 0)
error(S, "truncated chunk");
}
#define loadVar(S,x) loadVector(S,&x,1)
static lu_byte loadByte (LoadState *S) {
int b = zgetc(S->Z);
if (b == EOZ)
error(S, "truncated chunk");
return cast_byte(b);
}
static size_t loadUnsigned (LoadState *S, size_t limit) {
size_t x = 0;
int b;
limit >>= 7;
do {
b = loadByte(S);
if (x >= limit)
error(S, "integer overflow");
x = (x << 7) | (b & 0x7f);
} while ((b & 0x80) == 0);
return x;
}
static size_t loadSize (LoadState *S) {
return loadUnsigned(S, ~(size_t)0);
}
static int loadInt (LoadState *S) {
return cast_int(loadUnsigned(S, INT_MAX));
}
static lua_Number loadNumber (LoadState *S) {
lua_Number x;
loadVar(S, x);
return x;
}
static lua_Integer loadInteger (LoadState *S) {
lua_Integer x;
loadVar(S, x);
return x;
}
/*
** Load a nullable string into prototype 'p'.
*/
static TString *loadStringN (LoadState *S, Proto *p) {
lua_State *L = S->L;
TString *ts;
size_t size = loadSize(S);
if (size == 0) /* no string? */
return NULL;
else if (--size <= LUAI_MAXSHORTLEN) { /* short string? */
char buff[LUAI_MAXSHORTLEN];
loadVector(S, buff, size); /* load string into buffer */
ts = luaS_newlstr(L, buff, size); /* create string */
}
else { /* long string */
ts = luaS_createlngstrobj(L, size); /* create string */
loadVector(S, getstr(ts), size); /* load directly in final place */
}
luaC_objbarrier(L, p, ts);
return ts;
}
/*
** Load a non-nullable string into prototype 'p'.
*/
static TString *loadString (LoadState *S, Proto *p) {
TString *st = loadStringN(S, p);
if (st == NULL)
error(S, "bad format for constant string");
return st;
}
static void loadCode (LoadState *S, Proto *f) {
int n = loadInt(S);
f->code = luaM_newvectorchecked(S->L, n, Instruction);
f->sizecode = n;
loadVector(S, f->code, n);
}
static void loadFunction(LoadState *S, Proto *f, TString *psource);
static void loadConstants (LoadState *S, Proto *f) {
int i;
int n = loadInt(S);
f->k = luaM_newvectorchecked(S->L, n, TValue);
f->sizek = n;
for (i = 0; i < n; i++)
setnilvalue(&f->k[i]);
for (i = 0; i < n; i++) {
TValue *o = &f->k[i];
int t = loadByte(S);
switch (t) {
case LUA_VNIL:
setnilvalue(o);
break;
case LUA_VFALSE:
setbfvalue(o);
break;
case LUA_VTRUE:
setbtvalue(o);
break;
case LUA_VNUMFLT:
setfltvalue(o, loadNumber(S));
break;
case LUA_VNUMINT:
setivalue(o, loadInteger(S));
break;
case LUA_VSHRSTR:
case LUA_VLNGSTR:
setsvalue2n(S->L, o, loadString(S, f));
break;
default: lua_assert(0);
}
}
}
static void loadProtos (LoadState *S, Proto *f) {
int i;
int n = loadInt(S);
f->p = luaM_newvectorchecked(S->L, n, Proto *);
f->sizep = n;
for (i = 0; i < n; i++)
f->p[i] = NULL;
for (i = 0; i < n; i++) {
f->p[i] = luaF_newproto(S->L);
luaC_objbarrier(S->L, f, f->p[i]);
loadFunction(S, f->p[i], f->source);
}
}
static void loadUpvalues (LoadState *S, Proto *f) {
int i, n;
n = loadInt(S);
f->upvalues = luaM_newvectorchecked(S->L, n, Upvaldesc);
f->sizeupvalues = n;
for (i = 0; i < n; i++) {
f->upvalues[i].name = NULL;
f->upvalues[i].instack = loadByte(S);
f->upvalues[i].idx = loadByte(S);
f->upvalues[i].kind = loadByte(S);
}
}
static void loadDebug (LoadState *S, Proto *f) {
int i, n;
n = loadInt(S);
f->lineinfo = luaM_newvectorchecked(S->L, n, ls_byte);
f->sizelineinfo = n;
loadVector(S, f->lineinfo, n);
n = loadInt(S);
f->abslineinfo = luaM_newvectorchecked(S->L, n, AbsLineInfo);
f->sizeabslineinfo = n;
for (i = 0; i < n; i++) {
f->abslineinfo[i].pc = loadInt(S);
f->abslineinfo[i].line = loadInt(S);
}
n = loadInt(S);
f->locvars = luaM_newvectorchecked(S->L, n, LocVar);
f->sizelocvars = n;
for (i = 0; i < n; i++)
f->locvars[i].varname = NULL;
for (i = 0; i < n; i++) {
f->locvars[i].varname = loadStringN(S, f);
f->locvars[i].startpc = loadInt(S);
f->locvars[i].endpc = loadInt(S);
}
n = loadInt(S);
for (i = 0; i < n; i++)
f->upvalues[i].name = loadStringN(S, f);
}
static void loadFunction (LoadState *S, Proto *f, TString *psource) {
f->source = loadStringN(S, f);
if (f->source == NULL) /* no source in dump? */
f->source = psource; /* reuse parent's source */
f->linedefined = loadInt(S);
f->lastlinedefined = loadInt(S);
f->numparams = loadByte(S);
f->is_vararg = loadByte(S);
f->maxstacksize = loadByte(S);
loadCode(S, f);
loadConstants(S, f);
loadUpvalues(S, f);
loadProtos(S, f);
loadDebug(S, f);
}
static void checkliteral (LoadState *S, const char *s, const char *msg) {
char buff[sizeof(LUA_SIGNATURE) + sizeof(LUAC_DATA)]; /* larger than both */
size_t len = strlen(s);
loadVector(S, buff, len);
if (memcmp(s, buff, len) != 0)
error(S, msg);
}
static void fchecksize (LoadState *S, size_t size, const char *tname) {
if (loadByte(S) != size)
error(S, luaO_pushfstring(S->L, "%s size mismatch", tname));
}
#define checksize(S,t) fchecksize(S,sizeof(t),#t)
static void checkHeader (LoadState *S) {
/* skip 1st char (already read and checked) */
checkliteral(S, &LUA_SIGNATURE[1], "not a binary chunk");
if (loadByte(S) != LUAC_VERSION)
error(S, "version mismatch");
if (loadByte(S) != LUAC_FORMAT)
error(S, "format mismatch");
checkliteral(S, LUAC_DATA, "corrupted chunk");
checksize(S, Instruction);
checksize(S, lua_Integer);
checksize(S, lua_Number);
if (loadInteger(S) != LUAC_INT)
error(S, "integer format mismatch");
if (loadNumber(S) != LUAC_NUM)
error(S, "float format mismatch");
}
/*
** Load precompiled chunk.
*/
LClosure *luaU_undump(lua_State *L, ZIO *Z, const char *name) {
LoadState S;
LClosure *cl;
if (*name == '@' || *name == '=')
S.name = name + 1;
else if (*name == LUA_SIGNATURE[0])
S.name = "binary string";
else
S.name = name;
S.L = L;
S.Z = Z;
checkHeader(&S);
cl = luaF_newLclosure(L, loadByte(&S));
setclLvalue2s(L, L->top, cl);
luaD_inctop(L);
cl->p = luaF_newproto(L);
luaC_objbarrier(L, cl, cl->p);
loadFunction(&S, cl->p, NULL);
lua_assert(cl->nupvalues == cl->p->sizeupvalues);
luai_verifycode(L, cl->p);
return cl;
}
LUTF8LIB¶
/*
** $Id: lutf8lib.c $
** Standard library for UTF-8 manipulation
** See Copyright Notice in lua.h
*/
#define lutf8lib_c
#define LUA_LIB
#include "lprefix.h"
#include <assert.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "_native_lua_config.h" /* native Lua */
#define MAXUNICODE 0x10FFFFu
#define MAXUTF 0x7FFFFFFFu
/*
** Integer type for decoded UTF-8 values; MAXUTF needs 31 bits.
*/
#if (UINT_MAX >> 30) >= 1
typedef unsigned int utfint;
#else
typedef unsigned long utfint;
#endif
#define iscont(p) ((*(p) & 0xC0) == 0x80)
/* from strlib */
/* translate a relative string position: negative means back from end */
static lua_Integer u_posrelat (lua_Integer pos, size_t len) {
if (pos >= 0) return pos;
else if (0u - (size_t)pos > len) return 0;
else return (lua_Integer)len + pos + 1;
}
/*
** Decode one UTF-8 sequence, returning NULL if byte sequence is
** invalid. The array 'limits' stores the minimum value for each
** sequence length, to check for overlong representations. Its first
** entry forces an error for non-ascii bytes with no continuation
** bytes (count == 0).
*/
static const char *utf8_decode (const char *s, utfint *val, int strict) {
static const utfint limits[] =
{~(utfint)0, 0x80, 0x800, 0x10000u, 0x200000u, 0x4000000u};
unsigned int c = (unsigned char)s[0];
utfint res = 0; /* final result */
if (c < 0x80) /* ascii? */
res = c;
else {
int count = 0; /* to count number of continuation bytes */
for (; c & 0x40; c <<= 1) { /* while it needs continuation bytes... */
unsigned int cc = (unsigned char)s[++count]; /* read next byte */
if ((cc & 0xC0) != 0x80) /* not a continuation byte? */
return NULL; /* invalid byte sequence */
res = (res << 6) | (cc & 0x3F); /* add lower 6 bits from cont. byte */
}
res |= ((utfint)(c & 0x7F) << (count * 5)); /* add first byte */
if (count > 5 || res > MAXUTF || res < limits[count])
return NULL; /* invalid byte sequence */
s += count; /* skip continuation bytes read */
}
if (strict) {
/* check for invalid code points; too large or surrogates */
if (res > MAXUNICODE || (0xD800u <= res && res <= 0xDFFFu))
return NULL;
}
if (val) *val = res;
return s + 1; /* +1 to include first byte */
}
/*
** utf8len(s [, i [, j [, lax]]]) --> number of characters that
** start in the range [i,j], or nil + current position if 's' is not
** well formed in that interval
*/
static int utflen (lua_State *L) {
lua_Integer n = 0; /* counter for the number of characters */
size_t len; /* string length in bytes */
const char *s = luaL_checklstring(L, 1, &len);
lua_Integer posi = u_posrelat(luaL_optinteger(L, 2, 1), len);
lua_Integer posj = u_posrelat(luaL_optinteger(L, 3, -1), len);
int lax = lua_toboolean(L, 4);
luaL_argcheck(L, 1 <= posi && --posi <= (lua_Integer)len, 2,
"initial position out of bounds");
luaL_argcheck(L, --posj < (lua_Integer)len, 3,
"final position out of bounds");
while (posi <= posj) {
const char *s1 = utf8_decode(s + posi, NULL, !lax);
if (s1 == NULL) { /* conversion error? */
luaL_pushfail(L); /* return fail ... */
lua_pushinteger(L, posi + 1); /* ... and current position */
return 2;
}
posi = s1 - s;
n++;
}
lua_pushinteger(L, n);
return 1;
}
/*
** codepoint(s, [i, [j [, lax]]]) -> returns codepoints for all
** characters that start in the range [i,j]
*/
static int codepoint (lua_State *L) {
size_t len;
const char *s = luaL_checklstring(L, 1, &len);
lua_Integer posi = u_posrelat(luaL_optinteger(L, 2, 1), len);
lua_Integer pose = u_posrelat(luaL_optinteger(L, 3, posi), len);
int lax = lua_toboolean(L, 4);
int n;
const char *se;
luaL_argcheck(L, posi >= 1, 2, "out of bounds");
luaL_argcheck(L, pose <= (lua_Integer)len, 3, "out of bounds");
if (posi > pose) return 0; /* empty interval; return no values */
if (pose - posi >= INT_MAX) /* (lua_Integer -> int) overflow? */
return luaL_error(L, "string slice too long");
n = (int)(pose - posi) + 1; /* upper bound for number of returns */
luaL_checkstack(L, n, "string slice too long");
n = 0; /* count the number of returns */
se = s + pose; /* string end */
for (s += posi - 1; s < se;) {
utfint code;
s = utf8_decode(s, &code, !lax);
if (s == NULL)
return luaL_error(L, "invalid UTF-8 code");
lua_pushinteger(L, code);
n++;
}
return n;
}
static void pushutfchar (lua_State *L, int arg) {
lua_Unsigned code = (lua_Unsigned)luaL_checkinteger(L, arg);
luaL_argcheck(L, code <= MAXUTF, arg, "value out of range");
lua_pushfstring(L, "%U", (long)code);
}
/*
** utfchar(n1, n2, ...) -> char(n1)..char(n2)...
*/
static int utfchar (lua_State *L) {
int n = lua_gettop(L); /* number of arguments */
if (n == 1) /* optimize common case of single char */
pushutfchar(L, 1);
else {
int i;
luaL_Buffer b;
luaL_buffinit(L, &b);
for (i = 1; i <= n; i++) {
pushutfchar(L, i);
luaL_addvalue(&b);
}
luaL_pushresult(&b);
}
return 1;
}
/*
** offset(s, n, [i]) -> index where n-th character counting from
** position 'i' starts; 0 means character at 'i'.
*/
static int byteoffset (lua_State *L) {
size_t len;
const char *s = luaL_checklstring(L, 1, &len);
lua_Integer n = luaL_checkinteger(L, 2);
lua_Integer posi = (n >= 0) ? 1 : len + 1;
posi = u_posrelat(luaL_optinteger(L, 3, posi), len);
luaL_argcheck(L, 1 <= posi && --posi <= (lua_Integer)len, 3,
"position out of bounds");
if (n == 0) {
/* find beginning of current byte sequence */
while (posi > 0 && iscont(s + posi)) posi--;
}
else {
if (iscont(s + posi))
return luaL_error(L, "initial position is a continuation byte");
if (n < 0) {
while (n < 0 && posi > 0) { /* move back */
do { /* find beginning of previous character */
posi--;
} while (posi > 0 && iscont(s + posi));
n++;
}
}
else {
n--; /* do not move for 1st character */
while (n > 0 && posi < (lua_Integer)len) {
do { /* find beginning of next character */
posi++;
} while (iscont(s + posi)); /* (cannot pass final '\0') */
n--;
}
}
}
if (n == 0) /* did it find given character? */
lua_pushinteger(L, posi + 1);
else /* no such character */
luaL_pushfail(L);
return 1;
}
static int iter_aux (lua_State *L, int strict) {
size_t len;
const char *s = luaL_checklstring(L, 1, &len);
lua_Integer n = lua_tointeger(L, 2) - 1;
if (n < 0) /* first iteration? */
n = 0; /* start from here */
else if (n < (lua_Integer)len) {
n++; /* skip current byte */
while (iscont(s + n)) n++; /* and its continuations */
}
if (n >= (lua_Integer)len)
return 0; /* no more codepoints */
else {
utfint code;
const char *next = utf8_decode(s + n, &code, strict);
if (next == NULL)
return luaL_error(L, "invalid UTF-8 code");
lua_pushinteger(L, n + 1);
lua_pushinteger(L, code);
return 2;
}
}
static int iter_auxstrict (lua_State *L) {
return iter_aux(L, 1);
}
static int iter_auxlax (lua_State *L) {
return iter_aux(L, 0);
}
static int iter_codes (lua_State *L) {
int lax = lua_toboolean(L, 2);
luaL_checkstring(L, 1);
lua_pushcfunction(L, lax ? iter_auxlax : iter_auxstrict);
lua_pushvalue(L, 1);
lua_pushinteger(L, 0);
return 3;
}
/* pattern to match a single UTF-8 character */
#define UTF8PATT "[\0-\x7F\xC2-\xFD][\x80-\xBF]*"
static const luaL_Reg funcs[] = {
{"offset", byteoffset},
{"codepoint", codepoint},
{"char", utfchar},
{"len", utflen},
{"codes", iter_codes},
/* placeholders */
{"charpattern", NULL},
{NULL, NULL}
};
LUAMOD_API int luaopen_utf8 (lua_State *L) {
luaL_newlib(L, funcs);
lua_pushlstring(L, UTF8PATT, sizeof(UTF8PATT)/sizeof(char) - 1);
lua_setfield(L, -2, "charpattern");
return 1;
}
LVM¶
/*
** $Id: lvm.h $
** Lua virtual machine
** See Copyright Notice in lua.h
*/
#ifndef lvm_h
#define lvm_h
#include "ldo.h"
#include "lobject.h"
#include "ltm.h"
#include "_native_lua_config.h" /* native Lua */
#if !defined(LUA_NOCVTN2S)
#define cvt2str(o) ttisnumber(o)
#else
#define cvt2str(o) 0 /* no conversion from numbers to strings */
#endif
#if !defined(LUA_NOCVTS2N)
#define cvt2num(o) ttisstring(o)
#else
#define cvt2num(o) 0 /* no conversion from strings to numbers */
#endif
/*
** You can define LUA_FLOORN2I if you want to convert floats to integers
** by flooring them (instead of raising an error if they are not
** integral values)
*/
#if !defined(LUA_FLOORN2I)
#define LUA_FLOORN2I F2Ieq
#endif
/*
** Rounding modes for float->integer coercion
*/
typedef enum {
F2Ieq, /* no rounding; accepts only integral values */
F2Ifloor, /* takes the floor of the number */
F2Iceil /* takes the ceil of the number */
} F2Imod;
/* convert an object to a float (including string coercion) */
#define tonumber(o,n) \
(ttisfloat(o) ? (*(n) = fltvalue(o), 1) : luaV_tonumber_(o,n))
/* convert an object to a float (without string coercion) */
#define tonumberns(o,n) \
(ttisfloat(o) ? ((n) = fltvalue(o), 1) : \
(ttisinteger(o) ? ((n) = cast_num(ivalue(o)), 1) : 0))
/* convert an object to an integer (including string coercion) */
#define tointeger(o,i) \
(ttisinteger(o) ? (*(i) = ivalue(o), 1) : luaV_tointeger(o,i,LUA_FLOORN2I))
/* convert an object to an integer (without string coercion) */
#define tointegerns(o,i) \
(ttisinteger(o) ? (*(i) = ivalue(o), 1) : luaV_tointegerns(o,i,LUA_FLOORN2I))
#define intop(op,v1,v2) l_castU2S(l_castS2U(v1) op l_castS2U(v2))
#define luaV_rawequalobj(t1,t2) luaV_equalobj(NULL,t1,t2)
/*
** fast track for 'gettable': if 't' is a table and 't[k]' is present,
** return 1 with 'slot' pointing to 't[k]' (position of final result).
** Otherwise, return 0 (meaning it will have to check metamethod)
** with 'slot' pointing to an empty 't[k]' (if 't' is a table) or NULL
** (otherwise). 'f' is the raw get function to use.
*/
#define luaV_fastget(L,t,k,slot,f) \
(!ttistable(t) \
? (slot = NULL, 0) /* not a table; 'slot' is NULL and result is 0 */ \
: (slot = f(hvalue(t), k), /* else, do raw access */ \
!isempty(slot))) /* result not empty? */
/*
** Special case of 'luaV_fastget' for integers, inlining the fast case
** of 'luaH_getint'.
*/
#define luaV_fastgeti(L,t,k,slot) \
(!ttistable(t) \
? (slot = NULL, 0) /* not a table; 'slot' is NULL and result is 0 */ \
: (slot = (l_castS2U(k) - 1u < hvalue(t)->alimit) \
? &hvalue(t)->array[k - 1] : luaH_getint(hvalue(t), k), \
!isempty(slot))) /* result not empty? */
/*
** Finish a fast set operation (when fast get succeeds). In that case,
** 'slot' points to the place to put the value.
*/
#define luaV_finishfastset(L,t,slot,v) \
{ setobj2t(L, cast(TValue *,slot), v); \
luaC_barrierback(L, gcvalue(t), v); }
LUAI_FUNC int luaV_equalobj (lua_State *L, const TValue *t1, const TValue *t2);
LUAI_FUNC int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r);
LUAI_FUNC int luaV_lessequal (lua_State *L, const TValue *l, const TValue *r);
LUAI_FUNC int luaV_tonumber_ (const TValue *obj, lua_Number *n);
LUAI_FUNC int luaV_tointeger (const TValue *obj, lua_Integer *p, F2Imod mode);
LUAI_FUNC int luaV_tointegerns (const TValue *obj, lua_Integer *p,
F2Imod mode);
LUAI_FUNC int luaV_flttointeger (lua_Number n, lua_Integer *p, F2Imod mode);
LUAI_FUNC void luaV_finishget (lua_State *L, const TValue *t, TValue *key,
StkId val, const TValue *slot);
LUAI_FUNC void luaV_finishset (lua_State *L, const TValue *t, TValue *key,
TValue *val, const TValue *slot);
LUAI_FUNC void luaV_finishOp (lua_State *L);
LUAI_FUNC void luaV_execute (lua_State *L, CallInfo *ci);
LUAI_FUNC void luaV_concat (lua_State *L, int total);
LUAI_FUNC lua_Integer luaV_idiv (lua_State *L, lua_Integer x, lua_Integer y);
LUAI_FUNC lua_Integer luaV_mod (lua_State *L, lua_Integer x, lua_Integer y);
LUAI_FUNC lua_Number luaV_modf (lua_State *L, lua_Number x, lua_Number y);
LUAI_FUNC lua_Integer luaV_shiftl (lua_Integer x, lua_Integer y);
LUAI_FUNC void luaV_objlen (lua_State *L, StkId ra, const TValue *rb);
#endif
/*
** $Id: lvm.c $
** Lua virtual machine
** See Copyright Notice in lua.h
*/
#define lvm_c
#define LUA_CORE
#include "lprefix.h"
#include <float.h>
#include <limits.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lua.h"
#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "lgc.h"
#include "lobject.h"
#include "lopcodes.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "ltm.h"
#include "lvm.h"
/*
** By default, use jump tables in the main interpreter loop on gcc
** and compatible compilers.
*/
#if !defined(LUA_USE_JUMPTABLE)
#if defined(__GNUC__)
#define LUA_USE_JUMPTABLE 1
#else
#define LUA_USE_JUMPTABLE 0
#endif
#endif
/* limit for table tag-method chains (to avoid infinite loops) */
#define MAXTAGLOOP 2000
/*
** 'l_intfitsf' checks whether a given integer is in the range that
** can be converted to a float without rounding. Used in comparisons.
*/
/* number of bits in the mantissa of a float */
#define NBM (l_floatatt(MANT_DIG))
/*
** Check whether some integers may not fit in a float, testing whether
** (maxinteger >> NBM) > 0. (That implies (1 << NBM) <= maxinteger.)
** (The shifts are done in parts, to avoid shifting by more than the size
** of an integer. In a worst case, NBM == 113 for long double and
** sizeof(long) == 32.)
*/
#if ((((LUA_MAXINTEGER >> (NBM / 4)) >> (NBM / 4)) >> (NBM / 4)) \
>> (NBM - (3 * (NBM / 4)))) > 0
/* limit for integers that fit in a float */
#define MAXINTFITSF ((lua_Unsigned)1 << NBM)
/* check whether 'i' is in the interval [-MAXINTFITSF, MAXINTFITSF] */
#define l_intfitsf(i) ((MAXINTFITSF + l_castS2U(i)) <= (2 * MAXINTFITSF))
#else /* all integers fit in a float precisely */
#define l_intfitsf(i) 1
#endif
/*
** Try to convert a value from string to a number value.
** If the value is not a string or is a string not representing
** a valid numeral (or if coercions from strings to numbers
** are disabled via macro 'cvt2num'), do not modify 'result'
** and return 0.
*/
static int l_strton (const TValue *obj, TValue *result) {
lua_assert(obj != result);
if (!cvt2num(obj)) /* is object not a string? */
return 0;
else
return (luaO_str2num(svalue(obj), result) == vslen(obj) + 1);
}
/*
** Try to convert a value to a float. The float case is already handled
** by the macro 'tonumber'.
*/
int luaV_tonumber_ (const TValue *obj, lua_Number *n) {
TValue v;
if (ttisinteger(obj)) {
*n = cast_num(ivalue(obj));
return 1;
}
else if (l_strton(obj, &v)) { /* string coercible to number? */
*n = nvalue(&v); /* convert result of 'luaO_str2num' to a float */
return 1;
}
else
return 0; /* conversion failed */
}
/*
** try to convert a float to an integer, rounding according to 'mode'.
*/
int luaV_flttointeger (lua_Number n, lua_Integer *p, F2Imod mode) {
lua_Number f = l_floor(n);
if (n != f) { /* not an integral value? */
if (mode == F2Ieq) return 0; /* fails if mode demands integral value */
else if (mode == F2Iceil) /* needs ceil? */
f += 1; /* convert floor to ceil (remember: n != f) */
}
return lua_numbertointeger(f, p);
}
/*
** try to convert a value to an integer, rounding according to 'mode',
** without string coercion.
** ("Fast track" handled by macro 'tointegerns'.)
*/
int luaV_tointegerns (const TValue *obj, lua_Integer *p, F2Imod mode) {
if (ttisfloat(obj))
return luaV_flttointeger(fltvalue(obj), p, mode);
else if (ttisinteger(obj)) {
*p = ivalue(obj);
return 1;
}
else
return 0;
}
/*
** try to convert a value to an integer.
*/
int luaV_tointeger (const TValue *obj, lua_Integer *p, F2Imod mode) {
TValue v;
if (l_strton(obj, &v)) /* does 'obj' point to a numerical string? */
obj = &v; /* change it to point to its corresponding number */
return luaV_tointegerns(obj, p, mode);
}
/*
** Try to convert a 'for' limit to an integer, preserving the semantics
** of the loop. Return true if the loop must not run; otherwise, '*p'
** gets the integer limit.
** (The following explanation assumes a positive step; it is valid for
** negative steps mutatis mutandis.)
** If the limit is an integer or can be converted to an integer,
** rounding down, that is the limit.
** Otherwise, check whether the limit can be converted to a float. If
** the float is too large, clip it to LUA_MAXINTEGER. If the float
** is too negative, the loop should not run, because any initial
** integer value is greater than such limit; so, the function returns
** true to signal that. (For this latter case, no integer limit would be
** correct; even a limit of LUA_MININTEGER would run the loop once for
** an initial value equal to LUA_MININTEGER.)
*/
static int forlimit (lua_State *L, lua_Integer init, const TValue *lim,
lua_Integer *p, lua_Integer step) {
if (!luaV_tointeger(lim, p, (step < 0 ? F2Iceil : F2Ifloor))) {
/* not coercible to in integer */
lua_Number flim; /* try to convert to float */
if (!tonumber(lim, &flim)) /* cannot convert to float? */
luaG_forerror(L, lim, "limit");
/* else 'flim' is a float out of integer bounds */
if (luai_numlt(0, flim)) { /* if it is positive, it is too large */
if (step < 0) return 1; /* initial value must be less than it */
*p = LUA_MAXINTEGER; /* truncate */
}
else { /* it is less than min integer */
if (step > 0) return 1; /* initial value must be greater than it */
*p = LUA_MININTEGER; /* truncate */
}
}
return (step > 0 ? init > *p : init < *p); /* not to run? */
}
/*
** Prepare a numerical for loop (opcode OP_FORPREP).
** Return true to skip the loop. Otherwise,
** after preparation, stack will be as follows:
** ra : internal index (safe copy of the control variable)
** ra + 1 : loop counter (integer loops) or limit (float loops)
** ra + 2 : step
** ra + 3 : control variable
*/
static int forprep (lua_State *L, StkId ra) {
TValue *pinit = s2v(ra);
TValue *plimit = s2v(ra + 1);
TValue *pstep = s2v(ra + 2);
if (ttisinteger(pinit) && ttisinteger(pstep)) { /* integer loop? */
lua_Integer init = ivalue(pinit);
lua_Integer step = ivalue(pstep);
lua_Integer limit;
if (step == 0)
luaG_runerror(L, "'for' step is zero");
setivalue(s2v(ra + 3), init); /* control variable */
if (forlimit(L, init, plimit, &limit, step))
return 1; /* skip the loop */
else { /* prepare loop counter */
lua_Unsigned count;
if (step > 0) { /* ascending loop? */
count = l_castS2U(limit) - l_castS2U(init);
if (step != 1) /* avoid division in the too common case */
count /= l_castS2U(step);
}
else { /* step < 0; descending loop */
count = l_castS2U(init) - l_castS2U(limit);
/* 'step+1' avoids negating 'mininteger' */
count /= l_castS2U(-(step + 1)) + 1u;
}
/* store the counter in place of the limit (which won't be
needed anymore */
setivalue(plimit, l_castU2S(count));
}
}
else { /* try making all values floats */
lua_Number init; lua_Number limit; lua_Number step;
if (unlikely(!tonumber(plimit, &limit)))
luaG_forerror(L, plimit, "limit");
if (unlikely(!tonumber(pstep, &step)))
luaG_forerror(L, pstep, "step");
if (unlikely(!tonumber(pinit, &init)))
luaG_forerror(L, pinit, "initial value");
if (step == 0)
luaG_runerror(L, "'for' step is zero");
if (luai_numlt(0, step) ? luai_numlt(limit, init)
: luai_numlt(init, limit))
return 1; /* skip the loop */
else {
/* make sure internal values are all floats */
setfltvalue(plimit, limit);
setfltvalue(pstep, step);
setfltvalue(s2v(ra), init); /* internal index */
setfltvalue(s2v(ra + 3), init); /* control variable */
}
}
return 0;
}
/*
** Execute a step of a float numerical for loop, returning
** true iff the loop must continue. (The integer case is
** written online with opcode OP_FORLOOP, for performance.)
*/
static int floatforloop (StkId ra) {
lua_Number step = fltvalue(s2v(ra + 2));
lua_Number limit = fltvalue(s2v(ra + 1));
lua_Number idx = fltvalue(s2v(ra)); /* internal index */
idx = luai_numadd(L, idx, step); /* increment index */
if (luai_numlt(0, step) ? luai_numle(idx, limit)
: luai_numle(limit, idx)) {
chgfltvalue(s2v(ra), idx); /* update internal index */
setfltvalue(s2v(ra + 3), idx); /* and control variable */
return 1; /* jump back */
}
else
return 0; /* finish the loop */
}
/*
** Finish the table access 'val = t[key]'.
** if 'slot' is NULL, 't' is not a table; otherwise, 'slot' points to
** t[k] entry (which must be empty).
*/
void luaV_finishget (lua_State *L, const TValue *t, TValue *key, StkId val,
const TValue *slot) {
int loop; /* counter to avoid infinite loops */
const TValue *tm; /* metamethod */
for (loop = 0; loop < MAXTAGLOOP; loop++) {
if (slot == NULL) { /* 't' is not a table? */
lua_assert(!ttistable(t));
tm = luaT_gettmbyobj(L, t, TM_INDEX);
if (unlikely(notm(tm)))
luaG_typeerror(L, t, "index"); /* no metamethod */
/* else will try the metamethod */
}
else { /* 't' is a table */
lua_assert(isempty(slot));
tm = fasttm(L, hvalue(t)->metatable, TM_INDEX); /* table's metamethod */
if (tm == NULL) { /* no metamethod? */
setnilvalue(s2v(val)); /* result is nil */
return;
}
/* else will try the metamethod */
}
if (ttisfunction(tm)) { /* is metamethod a function? */
luaT_callTMres(L, tm, t, key, val); /* call it */
return;
}
t = tm; /* else try to access 'tm[key]' */
if (luaV_fastget(L, t, key, slot, luaH_get)) { /* fast track? */
setobj2s(L, val, slot); /* done */
return;
}
/* else repeat (tail call 'luaV_finishget') */
}
luaG_runerror(L, "'__index' chain too long; possible loop");
}
/*
** Finish a table assignment 't[key] = val'.
** If 'slot' is NULL, 't' is not a table. Otherwise, 'slot' points
** to the entry 't[key]', or to a value with an absent key if there
** is no such entry. (The value at 'slot' must be empty, otherwise
** 'luaV_fastget' would have done the job.)
*/
void luaV_finishset (lua_State *L, const TValue *t, TValue *key,
TValue *val, const TValue *slot) {
int loop; /* counter to avoid infinite loops */
for (loop = 0; loop < MAXTAGLOOP; loop++) {
const TValue *tm; /* '__newindex' metamethod */
if (slot != NULL) { /* is 't' a table? */
Table *h = hvalue(t); /* save 't' table */
lua_assert(isempty(slot)); /* slot must be empty */
tm = fasttm(L, h->metatable, TM_NEWINDEX); /* get metamethod */
if (tm == NULL) { /* no metamethod? */
if (isabstkey(slot)) /* no previous entry? */
slot = luaH_newkey(L, h, key); /* create one */
/* no metamethod and (now) there is an entry with given key */
setobj2t(L, cast(TValue *, slot), val); /* set its new value */
invalidateTMcache(h);
luaC_barrierback(L, obj2gco(h), val);
return;
}
/* else will try the metamethod */
}
else { /* not a table; check metamethod */
tm = luaT_gettmbyobj(L, t, TM_NEWINDEX);
if (unlikely(notm(tm)))
luaG_typeerror(L, t, "index");
}
/* try the metamethod */
if (ttisfunction(tm)) {
luaT_callTM(L, tm, t, key, val);
return;
}
t = tm; /* else repeat assignment over 'tm' */
if (luaV_fastget(L, t, key, slot, luaH_get)) {
luaV_finishfastset(L, t, slot, val);
return; /* done */
}
/* else 'return luaV_finishset(L, t, key, val, slot)' (loop) */
}
luaG_runerror(L, "'__newindex' chain too long; possible loop");
}
/*
** Compare two strings 'ls' x 'rs', returning an integer less-equal-
** -greater than zero if 'ls' is less-equal-greater than 'rs'.
** The code is a little tricky because it allows '\0' in the strings
** and it uses 'strcoll' (to respect locales) for each segments
** of the strings.
*/
static int l_strcmp (const TString *ls, const TString *rs) {
const char *l = getstr(ls);
size_t ll = tsslen(ls);
const char *r = getstr(rs);
size_t lr = tsslen(rs);
for (;;) { /* for each segment */
int temp = strcoll(l, r);
if (temp != 0) /* not equal? */
return temp; /* done */
else { /* strings are equal up to a '\0' */
size_t len = strlen(l); /* index of first '\0' in both strings */
if (len == lr) /* 'rs' is finished? */
return (len == ll) ? 0 : 1; /* check 'ls' */
else if (len == ll) /* 'ls' is finished? */
return -1; /* 'ls' is less than 'rs' ('rs' is not finished) */
/* both strings longer than 'len'; go on comparing after the '\0' */
len++;
l += len; ll -= len; r += len; lr -= len;
}
}
}
/*
** Check whether integer 'i' is less than float 'f'. If 'i' has an
** exact representation as a float ('l_intfitsf'), compare numbers as
** floats. Otherwise, use the equivalence 'i < f <=> i < ceil(f)'.
** If 'ceil(f)' is out of integer range, either 'f' is greater than
** all integers or less than all integers.
** (The test with 'l_intfitsf' is only for performance; the else
** case is correct for all values, but it is slow due to the conversion
** from float to int.)
** When 'f' is NaN, comparisons must result in false.
*/
static int LTintfloat (lua_Integer i, lua_Number f) {
if (l_intfitsf(i))
return luai_numlt(cast_num(i), f); /* compare them as floats */
else { /* i < f <=> i < ceil(f) */
lua_Integer fi;
if (luaV_flttointeger(f, &fi, F2Iceil)) /* fi = ceil(f) */
return i < fi; /* compare them as integers */
else /* 'f' is either greater or less than all integers */
return f > 0; /* greater? */
}
}
/*
** Check whether integer 'i' is less than or equal to float 'f'.
** See comments on previous function.
*/
static int LEintfloat (lua_Integer i, lua_Number f) {
if (l_intfitsf(i))
return luai_numle(cast_num(i), f); /* compare them as floats */
else { /* i <= f <=> i <= floor(f) */
lua_Integer fi;
if (luaV_flttointeger(f, &fi, F2Ifloor)) /* fi = floor(f) */
return i <= fi; /* compare them as integers */
else /* 'f' is either greater or less than all integers */
return f > 0; /* greater? */
}
}
/*
** Check whether float 'f' is less than integer 'i'.
** See comments on previous function.
*/
static int LTfloatint (lua_Number f, lua_Integer i) {
if (l_intfitsf(i))
return luai_numlt(f, cast_num(i)); /* compare them as floats */
else { /* f < i <=> floor(f) < i */
lua_Integer fi;
if (luaV_flttointeger(f, &fi, F2Ifloor)) /* fi = floor(f) */
return fi < i; /* compare them as integers */
else /* 'f' is either greater or less than all integers */
return f < 0; /* less? */
}
}
/*
** Check whether float 'f' is less than or equal to integer 'i'.
** See comments on previous function.
*/
static int LEfloatint (lua_Number f, lua_Integer i) {
if (l_intfitsf(i))
return luai_numle(f, cast_num(i)); /* compare them as floats */
else { /* f <= i <=> ceil(f) <= i */
lua_Integer fi;
if (luaV_flttointeger(f, &fi, F2Iceil)) /* fi = ceil(f) */
return fi <= i; /* compare them as integers */
else /* 'f' is either greater or less than all integers */
return f < 0; /* less? */
}
}
/*
** Return 'l < r', for numbers.
*/
static int LTnum (const TValue *l, const TValue *r) {
lua_assert(ttisnumber(l) && ttisnumber(r));
if (ttisinteger(l)) {
lua_Integer li = ivalue(l);
if (ttisinteger(r))
return li < ivalue(r); /* both are integers */
else /* 'l' is int and 'r' is float */
return LTintfloat(li, fltvalue(r)); /* l < r ? */
}
else {
lua_Number lf = fltvalue(l); /* 'l' must be float */
if (ttisfloat(r))
return luai_numlt(lf, fltvalue(r)); /* both are float */
else /* 'l' is float and 'r' is int */
return LTfloatint(lf, ivalue(r));
}
}
/*
** Return 'l <= r', for numbers.
*/
static int LEnum (const TValue *l, const TValue *r) {
lua_assert(ttisnumber(l) && ttisnumber(r));
if (ttisinteger(l)) {
lua_Integer li = ivalue(l);
if (ttisinteger(r))
return li <= ivalue(r); /* both are integers */
else /* 'l' is int and 'r' is float */
return LEintfloat(li, fltvalue(r)); /* l <= r ? */
}
else {
lua_Number lf = fltvalue(l); /* 'l' must be float */
if (ttisfloat(r))
return luai_numle(lf, fltvalue(r)); /* both are float */
else /* 'l' is float and 'r' is int */
return LEfloatint(lf, ivalue(r));
}
}
/*
** return 'l < r' for non-numbers.
*/
static int lessthanothers (lua_State *L, const TValue *l, const TValue *r) {
lua_assert(!ttisnumber(l) || !ttisnumber(r));
if (ttisstring(l) && ttisstring(r)) /* both are strings? */
return l_strcmp(tsvalue(l), tsvalue(r)) < 0;
else
return luaT_callorderTM(L, l, r, TM_LT);
}
/*
** Main operation less than; return 'l < r'.
*/
int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r) {
if (ttisnumber(l) && ttisnumber(r)) /* both operands are numbers? */
return LTnum(l, r);
else return lessthanothers(L, l, r);
}
/*
** return 'l <= r' for non-numbers.
*/
static int lessequalothers (lua_State *L, const TValue *l, const TValue *r) {
lua_assert(!ttisnumber(l) || !ttisnumber(r));
if (ttisstring(l) && ttisstring(r)) /* both are strings? */
return l_strcmp(tsvalue(l), tsvalue(r)) <= 0;
else
return luaT_callorderTM(L, l, r, TM_LE);
}
/*
** Main operation less than or equal to; return 'l <= r'.
*/
int luaV_lessequal (lua_State *L, const TValue *l, const TValue *r) {
if (ttisnumber(l) && ttisnumber(r)) /* both operands are numbers? */
return LEnum(l, r);
else return lessequalothers(L, l, r);
}
/*
** Main operation for equality of Lua values; return 't1 == t2'.
** L == NULL means raw equality (no metamethods)
*/
int luaV_equalobj (lua_State *L, const TValue *t1, const TValue *t2) {
const TValue *tm;
if (ttypetag(t1) != ttypetag(t2)) { /* not the same variant? */
if (ttype(t1) != ttype(t2) || ttype(t1) != LUA_TNUMBER)
return 0; /* only numbers can be equal with different variants */
else { /* two numbers with different variants */
lua_Integer i1, i2; /* compare them as integers */
return (tointegerns(t1, &i1) && tointegerns(t2, &i2) && i1 == i2);
}
}
/* values have same type and same variant */
switch (ttypetag(t1)) {
case LUA_VNIL: case LUA_VFALSE: case LUA_VTRUE: return 1;
case LUA_VNUMINT: return (ivalue(t1) == ivalue(t2));
case LUA_VNUMFLT: return luai_numeq(fltvalue(t1), fltvalue(t2));
case LUA_VLIGHTUSERDATA: return pvalue(t1) == pvalue(t2);
case LUA_VLCF: return fvalue(t1) == fvalue(t2);
case LUA_VSHRSTR: return eqshrstr(tsvalue(t1), tsvalue(t2));
case LUA_VLNGSTR: return luaS_eqlngstr(tsvalue(t1), tsvalue(t2));
case LUA_VUSERDATA: {
if (uvalue(t1) == uvalue(t2)) return 1;
else if (L == NULL) return 0;
tm = fasttm(L, uvalue(t1)->metatable, TM_EQ);
if (tm == NULL)
tm = fasttm(L, uvalue(t2)->metatable, TM_EQ);
break; /* will try TM */
}
case LUA_VTABLE: {
if (hvalue(t1) == hvalue(t2)) return 1;
else if (L == NULL) return 0;
tm = fasttm(L, hvalue(t1)->metatable, TM_EQ);
if (tm == NULL)
tm = fasttm(L, hvalue(t2)->metatable, TM_EQ);
break; /* will try TM */
}
default:
return gcvalue(t1) == gcvalue(t2);
}
if (tm == NULL) /* no TM? */
return 0; /* objects are different */
else {
luaT_callTMres(L, tm, t1, t2, L->top); /* call TM */
return !l_isfalse(s2v(L->top));
}
}
/* macro used by 'luaV_concat' to ensure that element at 'o' is a string */
#define tostring(L,o) \
(ttisstring(o) || (cvt2str(o) && (luaO_tostring(L, o), 1)))
#define isemptystr(o) (ttisshrstring(o) && tsvalue(o)->shrlen == 0)
/* copy strings in stack from top - n up to top - 1 to buffer */
static void copy2buff (StkId top, int n, char *buff) {
size_t tl = 0; /* size already copied */
do {
size_t l = vslen(s2v(top - n)); /* length of string being copied */
memcpy(buff + tl, svalue(s2v(top - n)), l * sizeof(char));
tl += l;
} while (--n > 0);
}
/*
** Main operation for concatenation: concat 'total' values in the stack,
** from 'L->top - total' up to 'L->top - 1'.
*/
void luaV_concat (lua_State *L, int total) {
lua_assert(total >= 2);
do {
StkId top = L->top;
int n = 2; /* number of elements handled in this pass (at least 2) */
if (!(ttisstring(s2v(top - 2)) || cvt2str(s2v(top - 2))) ||
!tostring(L, s2v(top - 1)))
luaT_tryconcatTM(L);
else if (isemptystr(s2v(top - 1))) /* second operand is empty? */
cast_void(tostring(L, s2v(top - 2))); /* result is first operand */
else if (isemptystr(s2v(top - 2))) { /* first operand is empty string? */
setobjs2s(L, top - 2, top - 1); /* result is second op. */
}
else {
/* at least two non-empty string values; get as many as possible */
size_t tl = vslen(s2v(top - 1));
TString *ts;
/* collect total length and number of strings */
for (n = 1; n < total && tostring(L, s2v(top - n - 1)); n++) {
size_t l = vslen(s2v(top - n - 1));
if (unlikely(l >= (MAX_SIZE/sizeof(char)) - tl))
luaG_runerror(L, "string length overflow");
tl += l;
}
if (tl <= LUAI_MAXSHORTLEN) { /* is result a short string? */
char buff[LUAI_MAXSHORTLEN];
copy2buff(top, n, buff); /* copy strings to buffer */
ts = luaS_newlstr(L, buff, tl);
}
else { /* long string; copy strings directly to final result */
ts = luaS_createlngstrobj(L, tl);
copy2buff(top, n, getstr(ts));
}
setsvalue2s(L, top - n, ts); /* create result */
}
total -= n-1; /* got 'n' strings to create 1 new */
L->top -= n-1; /* popped 'n' strings and pushed one */
} while (total > 1); /* repeat until only 1 result left */
}
/*
** Main operation 'ra = #rb'.
*/
void luaV_objlen (lua_State *L, StkId ra, const TValue *rb) {
const TValue *tm;
switch (ttypetag(rb)) {
case LUA_VTABLE: {
Table *h = hvalue(rb);
tm = fasttm(L, h->metatable, TM_LEN);
if (tm) break; /* metamethod? break switch to call it */
setivalue(s2v(ra), luaH_getn(h)); /* else primitive len */
return;
}
case LUA_VSHRSTR: {
setivalue(s2v(ra), tsvalue(rb)->shrlen);
return;
}
case LUA_VLNGSTR: {
setivalue(s2v(ra), tsvalue(rb)->u.lnglen);
return;
}
default: { /* try metamethod */
tm = luaT_gettmbyobj(L, rb, TM_LEN);
if (unlikely(notm(tm))) /* no metamethod? */
luaG_typeerror(L, rb, "get length of");
break;
}
}
luaT_callTMres(L, tm, rb, rb, ra);
}
/*
** Integer division; return 'm // n', that is, floor(m/n).
** C division truncates its result (rounds towards zero).
** 'floor(q) == trunc(q)' when 'q >= 0' or when 'q' is integer,
** otherwise 'floor(q) == trunc(q) - 1'.
*/
lua_Integer luaV_idiv (lua_State *L, lua_Integer m, lua_Integer n) {
if (unlikely(l_castS2U(n) + 1u <= 1u)) { /* special cases: -1 or 0 */
if (n == 0)
luaG_runerror(L, "attempt to divide by zero");
return intop(-, 0, m); /* n==-1; avoid overflow with 0x80000...//-1 */
}
else {
lua_Integer q = m / n; /* perform C division */
if ((m ^ n) < 0 && m % n != 0) /* 'm/n' would be negative non-integer? */
q -= 1; /* correct result for different rounding */
return q;
}
}
/*
** Integer modulus; return 'm % n'. (Assume that C '%' with
** negative operands follows C99 behavior. See previous comment
** about luaV_idiv.)
*/
lua_Integer luaV_mod (lua_State *L, lua_Integer m, lua_Integer n) {
if (unlikely(l_castS2U(n) + 1u <= 1u)) { /* special cases: -1 or 0 */
if (n == 0)
luaG_runerror(L, "attempt to perform 'n%%0'");
return 0; /* m % -1 == 0; avoid overflow with 0x80000...%-1 */
}
else {
lua_Integer r = m % n;
if (r != 0 && (r ^ n) < 0) /* 'm/n' would be non-integer negative? */
r += n; /* correct result for different rounding */
return r;
}
}
/*
** Float modulus
*/
lua_Number luaV_modf (lua_State *L, lua_Number m, lua_Number n) {
lua_Number r;
luai_nummod(L, m, n, r);
return r;
}
/* number of bits in an integer */
#define NBITS cast_int(sizeof(lua_Integer) * CHAR_BIT)
/*
** Shift left operation. (Shift right just negates 'y'.)
*/
#define luaV_shiftr(x,y) luaV_shiftl(x,-(y))
lua_Integer luaV_shiftl (lua_Integer x, lua_Integer y) {
if (y < 0) { /* shift right? */
if (y <= -NBITS) return 0;
else return intop(>>, x, -y);
}
else { /* shift left */
if (y >= NBITS) return 0;
else return intop(<<, x, y);
}
}
/*
** create a new Lua closure, push it in the stack, and initialize
** its upvalues.
*/
static void pushclosure (lua_State *L, Proto *p, UpVal **encup, StkId base,
StkId ra) {
int nup = p->sizeupvalues;
Upvaldesc *uv = p->upvalues;
int i;
LClosure *ncl = luaF_newLclosure(L, nup);
ncl->p = p;
setclLvalue2s(L, ra, ncl); /* anchor new closure in stack */
for (i = 0; i < nup; i++) { /* fill in its upvalues */
if (uv[i].instack) /* upvalue refers to local variable? */
ncl->upvals[i] = luaF_findupval(L, base + uv[i].idx);
else /* get upvalue from enclosing function */
ncl->upvals[i] = encup[uv[i].idx];
luaC_objbarrier(L, ncl, ncl->upvals[i]);
}
}
/*
** finish execution of an opcode interrupted by a yield
*/
void luaV_finishOp (lua_State *L) {
CallInfo *ci = L->ci;
StkId base = ci->func + 1;
Instruction inst = *(ci->u.l.savedpc - 1); /* interrupted instruction */
OpCode op = GET_OPCODE(inst);
switch (op) { /* finish its execution */
case OP_MMBIN: case OP_MMBINI: case OP_MMBINK: {
setobjs2s(L, base + GETARG_A(*(ci->u.l.savedpc - 2)), --L->top);
break;
}
case OP_UNM: case OP_BNOT: case OP_LEN:
case OP_GETTABUP: case OP_GETTABLE: case OP_GETI:
case OP_GETFIELD: case OP_SELF: {
setobjs2s(L, base + GETARG_A(inst), --L->top);
break;
}
case OP_LT: case OP_LE:
case OP_LTI: case OP_LEI:
case OP_GTI: case OP_GEI:
case OP_EQ: { /* note that 'OP_EQI'/'OP_EQK' cannot yield */
int res = !l_isfalse(s2v(L->top - 1));
L->top--;
#if defined(LUA_COMPAT_LT_LE)
if (ci->callstatus & CIST_LEQ) { /* "<=" using "<" instead? */
ci->callstatus ^= CIST_LEQ; /* clear mark */
res = !res; /* negate result */
}
#endif
lua_assert(GET_OPCODE(*ci->u.l.savedpc) == OP_JMP);
if (res != GETARG_k(inst)) /* condition failed? */
ci->u.l.savedpc++; /* skip jump instruction */
break;
}
case OP_CONCAT: {
StkId top = L->top - 1; /* top when 'luaT_tryconcatTM' was called */
int a = GETARG_A(inst); /* first element to concatenate */
int total = cast_int(top - 1 - (base + a)); /* yet to concatenate */
setobjs2s(L, top - 2, top); /* put TM result in proper position */
if (total > 1) { /* are there elements to concat? */
L->top = top - 1; /* top is one after last element (at top-2) */
luaV_concat(L, total); /* concat them (may yield again) */
}
break;
}
default: {
/* only these other opcodes can yield */
lua_assert(op == OP_TFORCALL || op == OP_CALL ||
op == OP_TAILCALL || op == OP_SETTABUP || op == OP_SETTABLE ||
op == OP_SETI || op == OP_SETFIELD);
break;
}
}
}
/*
** {==================================================================
** Macros for arithmetic/bitwise/comparison opcodes in 'luaV_execute'
** ===================================================================
*/
#define l_addi(L,a,b) intop(+, a, b)
#define l_subi(L,a,b) intop(-, a, b)
#define l_muli(L,a,b) intop(*, a, b)
#define l_band(a,b) intop(&, a, b)
#define l_bor(a,b) intop(|, a, b)
#define l_bxor(a,b) intop(^, a, b)
#define l_lti(a,b) (a < b)
#define l_lei(a,b) (a <= b)
#define l_gti(a,b) (a > b)
#define l_gei(a,b) (a >= b)
/*
** Arithmetic operations with immediate operands. 'iop' is the integer
** operation, 'fop' is the float operation.
*/
#define op_arithI(L,iop,fop) { \
TValue *v1 = vRB(i); \
int imm = GETARG_sC(i); \
if (ttisinteger(v1)) { \
lua_Integer iv1 = ivalue(v1); \
pc++; setivalue(s2v(ra), iop(L, iv1, imm)); \
} \
else if (ttisfloat(v1)) { \
lua_Number nb = fltvalue(v1); \
lua_Number fimm = cast_num(imm); \
pc++; setfltvalue(s2v(ra), fop(L, nb, fimm)); \
}}
/*
** Auxiliary function for arithmetic operations over floats and others
** with two register operands.
*/
#define op_arithf_aux(L,v1,v2,fop) { \
lua_Number n1; lua_Number n2; \
if (tonumberns(v1, n1) && tonumberns(v2, n2)) { \
pc++; setfltvalue(s2v(ra), fop(L, n1, n2)); \
}}
/*
** Arithmetic operations over floats and others with register operands.
*/
#define op_arithf(L,fop) { \
TValue *v1 = vRB(i); \
TValue *v2 = vRC(i); \
op_arithf_aux(L, v1, v2, fop); }
/*
** Arithmetic operations with K operands for floats.
*/
#define op_arithfK(L,fop) { \
TValue *v1 = vRB(i); \
TValue *v2 = KC(i); \
op_arithf_aux(L, v1, v2, fop); }
/*
** Arithmetic operations over integers and floats.
*/
#define op_arith_aux(L,v1,v2,iop,fop) { \
if (ttisinteger(v1) && ttisinteger(v2)) { \
lua_Integer i1 = ivalue(v1); lua_Integer i2 = ivalue(v2); \
pc++; setivalue(s2v(ra), iop(L, i1, i2)); \
} \
else op_arithf_aux(L, v1, v2, fop); }
/*
** Arithmetic operations with register operands.
*/
#define op_arith(L,iop,fop) { \
TValue *v1 = vRB(i); \
TValue *v2 = vRC(i); \
op_arith_aux(L, v1, v2, iop, fop); }
/*
** Arithmetic operations with K operands.
*/
#define op_arithK(L,iop,fop) { \
TValue *v1 = vRB(i); \
TValue *v2 = KC(i); \
op_arith_aux(L, v1, v2, iop, fop); }
/*
** Bitwise operations with constant operand.
*/
#define op_bitwiseK(L,op) { \
TValue *v1 = vRB(i); \
TValue *v2 = KC(i); \
lua_Integer i1; \
lua_Integer i2 = ivalue(v2); \
if (tointegerns(v1, &i1)) { \
pc++; setivalue(s2v(ra), op(i1, i2)); \
}}
/*
** Bitwise operations with register operands.
*/
#define op_bitwise(L,op) { \
TValue *v1 = vRB(i); \
TValue *v2 = vRC(i); \
lua_Integer i1; lua_Integer i2; \
if (tointegerns(v1, &i1) && tointegerns(v2, &i2)) { \
pc++; setivalue(s2v(ra), op(i1, i2)); \
}}
/*
** Order operations with register operands. 'opn' actually works
** for all numbers, but the fast track improves performance for
** integers.
*/
#define op_order(L,opi,opn,other) { \
int cond; \
TValue *rb = vRB(i); \
if (ttisinteger(s2v(ra)) && ttisinteger(rb)) { \
lua_Integer ia = ivalue(s2v(ra)); \
lua_Integer ib = ivalue(rb); \
cond = opi(ia, ib); \
} \
else if (ttisnumber(s2v(ra)) && ttisnumber(rb)) \
cond = opn(s2v(ra), rb); \
else \
Protect(cond = other(L, s2v(ra), rb)); \
docondjump(); }
/*
** Order operations with immediate operand. (Immediate operand is
** always small enough to have an exact representation as a float.)
*/
#define op_orderI(L,opi,opf,inv,tm) { \
int cond; \
int im = GETARG_sB(i); \
if (ttisinteger(s2v(ra))) \
cond = opi(ivalue(s2v(ra)), im); \
else if (ttisfloat(s2v(ra))) { \
lua_Number fa = fltvalue(s2v(ra)); \
lua_Number fim = cast_num(im); \
cond = opf(fa, fim); \
} \
else { \
int isf = GETARG_C(i); \
Protect(cond = luaT_callorderiTM(L, s2v(ra), im, inv, isf, tm)); \
} \
docondjump(); }
/* }================================================================== */
/*
** {==================================================================
** Function 'luaV_execute': main interpreter loop
** ===================================================================
*/
/*
** some macros for common tasks in 'luaV_execute'
*/
#define RA(i) (base+GETARG_A(i))
#define RB(i) (base+GETARG_B(i))
#define vRB(i) s2v(RB(i))
#define KB(i) (k+GETARG_B(i))
#define RC(i) (base+GETARG_C(i))
#define vRC(i) s2v(RC(i))
#define KC(i) (k+GETARG_C(i))
#define RKC(i) ((TESTARG_k(i)) ? k + GETARG_C(i) : s2v(base + GETARG_C(i)))
#define updatetrap(ci) (trap = ci->u.l.trap)
#define updatebase(ci) (base = ci->func + 1)
#define updatestack(ci) { if (trap) { updatebase(ci); ra = RA(i); } }
/*
** Execute a jump instruction. The 'updatetrap' allows signals to stop
** tight loops. (Without it, the local copy of 'trap' could never change.)
*/
#define dojump(ci,i,e) { pc += GETARG_sJ(i) + e; updatetrap(ci); }
/* for test instructions, execute the jump instruction that follows it */
#define donextjump(ci) { Instruction ni = *pc; dojump(ci, ni, 1); }
/*
** do a conditional jump: skip next instruction if 'cond' is not what
** was expected (parameter 'k'), else do next instruction, which must
** be a jump.
*/
#define docondjump() if (cond != GETARG_k(i)) pc++; else donextjump(ci);
/*
** Correct global 'pc'.
*/
#define savepc(L) (ci->u.l.savedpc = pc)
/*
** Whenever code can raise errors, the global 'pc' and the global
** 'top' must be correct to report occasional errors.
*/
#define savestate(L,ci) (savepc(L), L->top = ci->top)
/*
** Protect code that, in general, can raise errors, reallocate the
** stack, and change the hooks.
*/
#define Protect(exp) (savestate(L,ci), (exp), updatetrap(ci))
/* special version that does not change the top */
#define ProtectNT(exp) (savepc(L), (exp), updatetrap(ci))
/*
** Protect code that will finish the loop (returns) or can only raise
** errors. (That is, it will not return to the interpreter main loop
** after changing the stack or hooks.)
*/
#define halfProtect(exp) (savestate(L,ci), (exp))
/* idem, but without changing the stack */
#define halfProtectNT(exp) (savepc(L), (exp))
#define checkGC(L,c) \
{ luaC_condGC(L, L->top = (c), /* limit of live values */ \
updatetrap(ci)); \
luai_threadyield(L); }
/* fetch an instruction and prepare its execution */
#define vmfetch() { \
if (trap) { /* stack reallocation or hooks? */ \
trap = luaG_traceexec(L, pc); /* handle hooks */ \
updatebase(ci); /* correct stack */ \
} \
i = *(pc++); \
ra = RA(i); /* WARNING: any stack reallocation invalidates 'ra' */ \
}
#define vmdispatch(o) switch(o)
#define vmcase(l) case l:
#define vmbreak break
void luaV_execute (lua_State *L, CallInfo *ci) {
LClosure *cl;
TValue *k;
StkId base;
const Instruction *pc;
int trap;
#if LUA_USE_JUMPTABLE
#include "ljumptab.h"
#endif
tailcall:
trap = L->hookmask;
cl = clLvalue(s2v(ci->func));
k = cl->p->k;
pc = ci->u.l.savedpc;
if (trap) {
if (cl->p->is_vararg)
trap = 0; /* hooks will start after VARARGPREP instruction */
else if (pc == cl->p->code) /* first instruction (not resuming)? */
luaD_hookcall(L, ci);
ci->u.l.trap = 1; /* there may be other hooks */
}
base = ci->func + 1;
/* main loop of interpreter */
for (;;) {
Instruction i; /* instruction being executed */
StkId ra; /* instruction's A register */
vmfetch();
lua_assert(base == ci->func + 1);
lua_assert(base <= L->top && L->top < L->stack + L->stacksize);
/* invalidate top for instructions not expecting it */
lua_assert(isIT(i) || (cast_void(L->top = base), 1));
vmdispatch (GET_OPCODE(i)) {
vmcase(OP_MOVE) {
setobjs2s(L, ra, RB(i));
vmbreak;
}
vmcase(OP_LOADI) {
lua_Integer b = GETARG_sBx(i);
setivalue(s2v(ra), b);
vmbreak;
}
vmcase(OP_LOADF) {
int b = GETARG_sBx(i);
setfltvalue(s2v(ra), cast_num(b));
vmbreak;
}
vmcase(OP_LOADK) {
TValue *rb = k + GETARG_Bx(i);
setobj2s(L, ra, rb);
vmbreak;
}
vmcase(OP_LOADKX) {
TValue *rb;
rb = k + GETARG_Ax(*pc); pc++;
setobj2s(L, ra, rb);
vmbreak;
}
vmcase(OP_LOADFALSE) {
setbfvalue(s2v(ra));
vmbreak;
}
vmcase(OP_LFALSESKIP) {
setbfvalue(s2v(ra));
pc++; /* skip next instruction */
vmbreak;
}
vmcase(OP_LOADTRUE) {
setbtvalue(s2v(ra));
vmbreak;
}
vmcase(OP_LOADNIL) {
int b = GETARG_B(i);
do {
setnilvalue(s2v(ra++));
} while (b--);
vmbreak;
}
vmcase(OP_GETUPVAL) {
int b = GETARG_B(i);
setobj2s(L, ra, cl->upvals[b]->v);
vmbreak;
}
vmcase(OP_SETUPVAL) {
UpVal *uv = cl->upvals[GETARG_B(i)];
setobj(L, uv->v, s2v(ra));
luaC_barrier(L, uv, s2v(ra));
vmbreak;
}
vmcase(OP_GETTABUP) {
const TValue *slot;
TValue *upval = cl->upvals[GETARG_B(i)]->v;
TValue *rc = KC(i);
TString *key = tsvalue(rc); /* key must be a string */
if (luaV_fastget(L, upval, key, slot, luaH_getshortstr)) {
setobj2s(L, ra, slot);
}
else
Protect(luaV_finishget(L, upval, rc, ra, slot));
vmbreak;
}
vmcase(OP_GETTABLE) {
const TValue *slot;
TValue *rb = vRB(i);
TValue *rc = vRC(i);
lua_Unsigned n;
if (ttisinteger(rc) /* fast track for integers? */
? (cast_void(n = ivalue(rc)), luaV_fastgeti(L, rb, n, slot))
: luaV_fastget(L, rb, rc, slot, luaH_get)) {
setobj2s(L, ra, slot);
}
else
Protect(luaV_finishget(L, rb, rc, ra, slot));
vmbreak;
}
vmcase(OP_GETI) {
const TValue *slot;
TValue *rb = vRB(i);
int c = GETARG_C(i);
if (luaV_fastgeti(L, rb, c, slot)) {
setobj2s(L, ra, slot);
}
else {
TValue key;
setivalue(&key, c);
Protect(luaV_finishget(L, rb, &key, ra, slot));
}
vmbreak;
}
vmcase(OP_GETFIELD) {
const TValue *slot;
TValue *rb = vRB(i);
TValue *rc = KC(i);
TString *key = tsvalue(rc); /* key must be a string */
if (luaV_fastget(L, rb, key, slot, luaH_getshortstr)) {
setobj2s(L, ra, slot);
}
else
Protect(luaV_finishget(L, rb, rc, ra, slot));
vmbreak;
}
vmcase(OP_SETTABUP) {
const TValue *slot;
TValue *upval = cl->upvals[GETARG_A(i)]->v;
TValue *rb = KB(i);
TValue *rc = RKC(i);
TString *key = tsvalue(rb); /* key must be a string */
if (luaV_fastget(L, upval, key, slot, luaH_getshortstr)) {
luaV_finishfastset(L, upval, slot, rc);
}
else
Protect(luaV_finishset(L, upval, rb, rc, slot));
vmbreak;
}
vmcase(OP_SETTABLE) {
const TValue *slot;
TValue *rb = vRB(i); /* key (table is in 'ra') */
TValue *rc = RKC(i); /* value */
lua_Unsigned n;
if (ttisinteger(rb) /* fast track for integers? */
? (cast_void(n = ivalue(rb)), luaV_fastgeti(L, s2v(ra), n, slot))
: luaV_fastget(L, s2v(ra), rb, slot, luaH_get)) {
luaV_finishfastset(L, s2v(ra), slot, rc);
}
else
Protect(luaV_finishset(L, s2v(ra), rb, rc, slot));
vmbreak;
}
vmcase(OP_SETI) {
const TValue *slot;
int c = GETARG_B(i);
TValue *rc = RKC(i);
if (luaV_fastgeti(L, s2v(ra), c, slot)) {
luaV_finishfastset(L, s2v(ra), slot, rc);
}
else {
TValue key;
setivalue(&key, c);
Protect(luaV_finishset(L, s2v(ra), &key, rc, slot));
}
vmbreak;
}
vmcase(OP_SETFIELD) {
const TValue *slot;
TValue *rb = KB(i);
TValue *rc = RKC(i);
TString *key = tsvalue(rb); /* key must be a string */
if (luaV_fastget(L, s2v(ra), key, slot, luaH_getshortstr)) {
luaV_finishfastset(L, s2v(ra), slot, rc);
}
else
Protect(luaV_finishset(L, s2v(ra), rb, rc, slot));
vmbreak;
}
vmcase(OP_NEWTABLE) {
int b = GETARG_B(i); /* log2(hash size) + 1 */
int c = GETARG_C(i); /* array size */
Table *t;
if (b > 0)
b = 1 << (b - 1); /* size is 2^(b - 1) */
lua_assert((!TESTARG_k(i)) == (GETARG_Ax(*pc) == 0));
if (TESTARG_k(i)) /* non-zero extra argument? */
c += GETARG_Ax(*pc) * (MAXARG_C + 1); /* add it to size */
pc++; /* skip extra argument */
L->top = ra + 1; /* correct top in case of emergency GC */
t = luaH_new(L); /* memory allocation */
sethvalue2s(L, ra, t);
if (b != 0 || c != 0)
luaH_resize(L, t, c, b); /* idem */
checkGC(L, ra + 1);
vmbreak;
}
vmcase(OP_SELF) {
const TValue *slot;
TValue *rb = vRB(i);
TValue *rc = RKC(i);
TString *key = tsvalue(rc); /* key must be a string */
setobj2s(L, ra + 1, rb);
if (luaV_fastget(L, rb, key, slot, luaH_getstr)) {
setobj2s(L, ra, slot);
}
else
Protect(luaV_finishget(L, rb, rc, ra, slot));
vmbreak;
}
vmcase(OP_ADDI) {
op_arithI(L, l_addi, luai_numadd);
vmbreak;
}
vmcase(OP_ADDK) {
op_arithK(L, l_addi, luai_numadd);
vmbreak;
}
vmcase(OP_SUBK) {
op_arithK(L, l_subi, luai_numsub);
vmbreak;
}
vmcase(OP_MULK) {
op_arithK(L, l_muli, luai_nummul);
vmbreak;
}
vmcase(OP_MODK) {
op_arithK(L, luaV_mod, luaV_modf);
vmbreak;
}
vmcase(OP_POWK) {
op_arithfK(L, luai_numpow);
vmbreak;
}
vmcase(OP_DIVK) {
op_arithfK(L, luai_numdiv);
vmbreak;
}
vmcase(OP_IDIVK) {
op_arithK(L, luaV_idiv, luai_numidiv);
vmbreak;
}
vmcase(OP_BANDK) {
op_bitwiseK(L, l_band);
vmbreak;
}
vmcase(OP_BORK) {
op_bitwiseK(L, l_bor);
vmbreak;
}
vmcase(OP_BXORK) {
op_bitwiseK(L, l_bxor);
vmbreak;
}
vmcase(OP_SHRI) {
TValue *rb = vRB(i);
int ic = GETARG_sC(i);
lua_Integer ib;
if (tointegerns(rb, &ib)) {
pc++; setivalue(s2v(ra), luaV_shiftl(ib, -ic));
}
vmbreak;
}
vmcase(OP_SHLI) {
TValue *rb = vRB(i);
int ic = GETARG_sC(i);
lua_Integer ib;
if (tointegerns(rb, &ib)) {
pc++; setivalue(s2v(ra), luaV_shiftl(ic, ib));
}
vmbreak;
}
vmcase(OP_ADD) {
op_arith(L, l_addi, luai_numadd);
vmbreak;
}
vmcase(OP_SUB) {
op_arith(L, l_subi, luai_numsub);
vmbreak;
}
vmcase(OP_MUL) {
op_arith(L, l_muli, luai_nummul);
vmbreak;
}
vmcase(OP_MOD) {
op_arith(L, luaV_mod, luaV_modf);
vmbreak;
}
vmcase(OP_POW) {
op_arithf(L, luai_numpow);
vmbreak;
}
vmcase(OP_DIV) { /* float division (always with floats) */
op_arithf(L, luai_numdiv);
vmbreak;
}
vmcase(OP_IDIV) { /* floor division */
op_arith(L, luaV_idiv, luai_numidiv);
vmbreak;
}
vmcase(OP_BAND) {
op_bitwise(L, l_band);
vmbreak;
}
vmcase(OP_BOR) {
op_bitwise(L, l_bor);
vmbreak;
}
vmcase(OP_BXOR) {
op_bitwise(L, l_bxor);
vmbreak;
}
vmcase(OP_SHR) {
op_bitwise(L, luaV_shiftr);
vmbreak;
}
vmcase(OP_SHL) {
op_bitwise(L, luaV_shiftl);
vmbreak;
}
vmcase(OP_MMBIN) {
Instruction pi = *(pc - 2); /* original arith. expression */
TValue *rb = vRB(i);
TMS tm = (TMS)GETARG_C(i);
StkId result = RA(pi);
lua_assert(OP_ADD <= GET_OPCODE(pi) && GET_OPCODE(pi) <= OP_SHR);
Protect(luaT_trybinTM(L, s2v(ra), rb, result, tm));
vmbreak;
}
vmcase(OP_MMBINI) {
Instruction pi = *(pc - 2); /* original arith. expression */
int imm = GETARG_sB(i);
TMS tm = (TMS)GETARG_C(i);
int flip = GETARG_k(i);
StkId result = RA(pi);
Protect(luaT_trybiniTM(L, s2v(ra), imm, flip, result, tm));
vmbreak;
}
vmcase(OP_MMBINK) {
Instruction pi = *(pc - 2); /* original arith. expression */
TValue *imm = KB(i);
TMS tm = (TMS)GETARG_C(i);
int flip = GETARG_k(i);
StkId result = RA(pi);
Protect(luaT_trybinassocTM(L, s2v(ra), imm, flip, result, tm));
vmbreak;
}
vmcase(OP_UNM) {
TValue *rb = vRB(i);
lua_Number nb;
if (ttisinteger(rb)) {
lua_Integer ib = ivalue(rb);
setivalue(s2v(ra), intop(-, 0, ib));
}
else if (tonumberns(rb, nb)) {
setfltvalue(s2v(ra), luai_numunm(L, nb));
}
else
Protect(luaT_trybinTM(L, rb, rb, ra, TM_UNM));
vmbreak;
}
vmcase(OP_BNOT) {
TValue *rb = vRB(i);
lua_Integer ib;
if (tointegerns(rb, &ib)) {
setivalue(s2v(ra), intop(^, ~l_castS2U(0), ib));
}
else
Protect(luaT_trybinTM(L, rb, rb, ra, TM_BNOT));
vmbreak;
}
vmcase(OP_NOT) {
TValue *rb = vRB(i);
if (l_isfalse(rb))
setbtvalue(s2v(ra));
else
setbfvalue(s2v(ra));
vmbreak;
}
vmcase(OP_LEN) {
Protect(luaV_objlen(L, ra, vRB(i)));
vmbreak;
}
vmcase(OP_CONCAT) {
int n = GETARG_B(i); /* number of elements to concatenate */
L->top = ra + n; /* mark the end of concat operands */
ProtectNT(luaV_concat(L, n));
checkGC(L, L->top); /* 'luaV_concat' ensures correct top */
vmbreak;
}
vmcase(OP_CLOSE) {
Protect(luaF_close(L, ra, LUA_OK));
vmbreak;
}
vmcase(OP_TBC) {
/* create new to-be-closed upvalue */
halfProtect(luaF_newtbcupval(L, ra));
vmbreak;
}
vmcase(OP_JMP) {
dojump(ci, i, 0);
vmbreak;
}
vmcase(OP_EQ) {
int cond;
TValue *rb = vRB(i);
Protect(cond = luaV_equalobj(L, s2v(ra), rb));
docondjump();
vmbreak;
}
vmcase(OP_LT) {
op_order(L, l_lti, LTnum, lessthanothers);
vmbreak;
}
vmcase(OP_LE) {
op_order(L, l_lei, LEnum, lessequalothers);
vmbreak;
}
vmcase(OP_EQK) {
TValue *rb = KB(i);
/* basic types do not use '__eq'; we can use raw equality */
int cond = luaV_rawequalobj(s2v(ra), rb);
docondjump();
vmbreak;
}
vmcase(OP_EQI) {
int cond;
int im = GETARG_sB(i);
if (ttisinteger(s2v(ra)))
cond = (ivalue(s2v(ra)) == im);
else if (ttisfloat(s2v(ra)))
cond = luai_numeq(fltvalue(s2v(ra)), cast_num(im));
else
cond = 0; /* other types cannot be equal to a number */
docondjump();
vmbreak;
}
vmcase(OP_LTI) {
op_orderI(L, l_lti, luai_numlt, 0, TM_LT);
vmbreak;
}
vmcase(OP_LEI) {
op_orderI(L, l_lei, luai_numle, 0, TM_LE);
vmbreak;
}
vmcase(OP_GTI) {
op_orderI(L, l_gti, luai_numgt, 1, TM_LT);
vmbreak;
}
vmcase(OP_GEI) {
op_orderI(L, l_gei, luai_numge, 1, TM_LE);
vmbreak;
}
vmcase(OP_TEST) {
int cond = !l_isfalse(s2v(ra));
docondjump();
vmbreak;
}
vmcase(OP_TESTSET) {
TValue *rb = vRB(i);
if (l_isfalse(rb) == GETARG_k(i))
pc++;
else {
setobj2s(L, ra, rb);
donextjump(ci);
}
vmbreak;
}
vmcase(OP_CALL) {
int b = GETARG_B(i);
int nresults = GETARG_C(i) - 1;
if (b != 0) /* fixed number of arguments? */
L->top = ra + b; /* top signals number of arguments */
/* else previous instruction set top */
ProtectNT(luaD_call(L, ra, nresults));
vmbreak;
}
vmcase(OP_TAILCALL) {
int b = GETARG_B(i); /* number of arguments + 1 (function) */
int nparams1 = GETARG_C(i);
/* delat is virtual 'func' - real 'func' (vararg functions) */
int delta = (nparams1) ? ci->u.l.nextraargs + nparams1 : 0;
if (b != 0)
L->top = ra + b;
else /* previous instruction set top */
b = cast_int(L->top - ra);
savepc(ci); /* some calls here can raise errors */
if (TESTARG_k(i)) {
/* close upvalues from current call; the compiler ensures
that there are no to-be-closed variables here, so this
call cannot change the stack */
luaF_close(L, base, NOCLOSINGMETH);
lua_assert(base == ci->func + 1);
}
while (!ttisfunction(s2v(ra))) { /* not a function? */
luaD_tryfuncTM(L, ra); /* try '__call' metamethod */
b++; /* there is now one extra argument */
checkstackp(L, 1, ra);
}
if (!ttisLclosure(s2v(ra))) { /* C function? */
luaD_call(L, ra, LUA_MULTRET); /* call it */
updatetrap(ci);
updatestack(ci); /* stack may have been relocated */
ci->func -= delta;
luaD_poscall(L, ci, cast_int(L->top - ra));
return;
}
ci->func -= delta;
luaD_pretailcall(L, ci, ra, b); /* prepare call frame */
goto tailcall;
}
vmcase(OP_RETURN) {
int n = GETARG_B(i) - 1; /* number of results */
int nparams1 = GETARG_C(i);
if (n < 0) /* not fixed? */
n = cast_int(L->top - ra); /* get what is available */
savepc(ci);
if (TESTARG_k(i)) { /* may there be open upvalues? */
if (L->top < ci->top)
L->top = ci->top;
luaF_close(L, base, LUA_OK);
updatetrap(ci);
updatestack(ci);
}
if (nparams1) /* vararg function? */
ci->func -= ci->u.l.nextraargs + nparams1;
L->top = ra + n; /* set call for 'luaD_poscall' */
luaD_poscall(L, ci, n);
return;
}
vmcase(OP_RETURN0) {
if (L->hookmask) {
L->top = ra;
halfProtectNT(luaD_poscall(L, ci, 0)); /* no hurry... */
}
else { /* do the 'poscall' here */
int nres = ci->nresults;
L->ci = ci->previous; /* back to caller */
L->top = base - 1;
while (nres-- > 0)
setnilvalue(s2v(L->top++)); /* all results are nil */
}
return;
}
vmcase(OP_RETURN1) {
if (L->hookmask) {
L->top = ra + 1;
halfProtectNT(luaD_poscall(L, ci, 1)); /* no hurry... */
}
else { /* do the 'poscall' here */
int nres = ci->nresults;
L->ci = ci->previous; /* back to caller */
if (nres == 0)
L->top = base - 1; /* asked for no results */
else {
setobjs2s(L, base - 1, ra); /* at least this result */
L->top = base;
while (--nres > 0) /* complete missing results */
setnilvalue(s2v(L->top++));
}
}
return;
}
vmcase(OP_FORLOOP) {
if (ttisinteger(s2v(ra + 2))) { /* integer loop? */
lua_Unsigned count = l_castS2U(ivalue(s2v(ra + 1)));
if (count > 0) { /* still more iterations? */
lua_Integer step = ivalue(s2v(ra + 2));
lua_Integer idx = ivalue(s2v(ra)); /* internal index */
chgivalue(s2v(ra + 1), count - 1); /* update counter */
idx = intop(+, idx, step); /* add step to index */
chgivalue(s2v(ra), idx); /* update internal index */
setivalue(s2v(ra + 3), idx); /* and control variable */
pc -= GETARG_Bx(i); /* jump back */
}
}
else if (floatforloop(ra)) /* float loop */
pc -= GETARG_Bx(i); /* jump back */
updatetrap(ci); /* allows a signal to break the loop */
vmbreak;
}
vmcase(OP_FORPREP) {
savestate(L, ci); /* in case of errors */
if (forprep(L, ra))
pc += GETARG_Bx(i) + 1; /* skip the loop */
vmbreak;
}
vmcase(OP_TFORPREP) {
/* create to-be-closed upvalue (if needed) */
halfProtect(luaF_newtbcupval(L, ra + 3));
pc += GETARG_Bx(i);
i = *(pc++); /* go to next instruction */
lua_assert(GET_OPCODE(i) == OP_TFORCALL && ra == RA(i));
goto l_tforcall;
}
vmcase(OP_TFORCALL) {
l_tforcall:
/* 'ra' has the iterator function, 'ra + 1' has the state,
'ra + 2' has the control variable, and 'ra + 3' has the
to-be-closed variable. The call will use the stack after
these values (starting at 'ra + 4')
*/
/* push function, state, and control variable */
memcpy(ra + 4, ra, 3 * sizeof(*ra));
L->top = ra + 4 + 3;
ProtectNT(luaD_call(L, ra + 4, GETARG_C(i))); /* do the call */
updatestack(ci); /* stack may have changed */
i = *(pc++); /* go to next instruction */
lua_assert(GET_OPCODE(i) == OP_TFORLOOP && ra == RA(i));
goto l_tforloop;
}
vmcase(OP_TFORLOOP) {
l_tforloop:
if (!ttisnil(s2v(ra + 4))) { /* continue loop? */
setobjs2s(L, ra + 2, ra + 4); /* save control variable */
pc -= GETARG_Bx(i); /* jump back */
}
vmbreak;
}
vmcase(OP_SETLIST) {
int n = GETARG_B(i);
unsigned int last = GETARG_C(i);
Table *h = hvalue(s2v(ra));
if (n == 0)
n = cast_int(L->top - ra) - 1; /* get up to the top */
else
L->top = ci->top; /* correct top in case of emergency GC */
last += n;
if (TESTARG_k(i)) {
last += GETARG_Ax(*pc) * (MAXARG_C + 1);
pc++;
}
if (last > luaH_realasize(h)) /* needs more space? */
luaH_resizearray(L, h, last); /* preallocate it at once */
for (; n > 0; n--) {
TValue *val = s2v(ra + n);
setobj2t(L, &h->array[last - 1], val);
last--;
luaC_barrierback(L, obj2gco(h), val);
}
vmbreak;
}
vmcase(OP_CLOSURE) {
Proto *p = cl->p->p[GETARG_Bx(i)];
halfProtect(pushclosure(L, p, cl->upvals, base, ra));
checkGC(L, ra + 1);
vmbreak;
}
vmcase(OP_VARARG) {
int n = GETARG_C(i) - 1; /* required results */
Protect(luaT_getvarargs(L, ci, ra, n));
vmbreak;
}
vmcase(OP_VARARGPREP) {
luaT_adjustvarargs(L, GETARG_A(i), ci, cl->p);
updatetrap(ci);
if (trap) {
luaD_hookcall(L, ci);
L->oldpc = pc + 1; /* next opcode will be seen as a "new" line */
}
updatebase(ci); /* function has new base after adjustment */
vmbreak;
}
vmcase(OP_EXTRAARG) {
lua_assert(0);
vmbreak;
}
}
}
}
/* }================================================================== */
LZIO¶
/*
** $Id: lzio.h $
** Buffered streams
** See Copyright Notice in lua.h
*/
#ifndef lzio_h
#define lzio_h
#include "lua.h"
#include "lmem.h"
#include "_native_lua_config.h" /* native Lua */
#define EOZ (-1) /* end of stream */
typedef struct Zio ZIO;
#define zgetc(z) (((z)->n--)>0 ? cast_uchar(*(z)->p++) : luaZ_fill(z))
typedef struct Mbuffer {
char *buffer;
size_t n;
size_t buffsize;
} Mbuffer;
#define luaZ_initbuffer(L, buff) ((buff)->buffer = NULL, (buff)->buffsize = 0)
#define luaZ_buffer(buff) ((buff)->buffer)
#define luaZ_sizebuffer(buff) ((buff)->buffsize)
#define luaZ_bufflen(buff) ((buff)->n)
#define luaZ_buffremove(buff,i) ((buff)->n -= (i))
#define luaZ_resetbuffer(buff) ((buff)->n = 0)
#define luaZ_resizebuffer(L, buff, size) \
((buff)->buffer = luaM_reallocvchar(L, (buff)->buffer, \
(buff)->buffsize, size), \
(buff)->buffsize = size)
#define luaZ_freebuffer(L, buff) luaZ_resizebuffer(L, buff, 0)
LUAI_FUNC void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader,
void *data);
LUAI_FUNC size_t luaZ_read (ZIO* z, void *b, size_t n); /* read next n bytes */
/* --------- Private Part ------------------ */
struct Zio {
size_t n; /* bytes still unread */
const char *p; /* current position in buffer */
lua_Reader reader; /* reader function */
void *data; /* additional data */
lua_State *L; /* Lua state (for reader) */
};
LUAI_FUNC int luaZ_fill (ZIO *z);
#endif
/*
** $Id: lzio.c $
** Buffered streams
** See Copyright Notice in lua.h
*/
#define lzio_c
#define LUA_CORE
#include "lprefix.h"
#include <string.h>
#include "lua.h"
#include "llimits.h"
#include "lmem.h"
#include "lstate.h"
#include "lzio.h"
int luaZ_fill (ZIO *z) {
size_t size;
lua_State *L = z->L;
const char *buff;
lua_unlock(L);
buff = z->reader(L, z->data, &size);
lua_lock(L);
if (buff == NULL || size == 0)
return EOZ;
z->n = size - 1; /* discount char being returned */
z->p = buff;
return cast_uchar(*(z->p++));
}
void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader, void *data) {
z->L = L;
z->reader = reader;
z->data = data;
z->n = 0;
z->p = NULL;
}
/* --------------------------------------------------------------- read --- */
size_t luaZ_read (ZIO *z, void *b, size_t n) {
while (n) {
size_t m;
if (z->n == 0) { /* no bytes in buffer? */
if (luaZ_fill(z) == EOZ) /* try to read more */
return n; /* no more input; return number of missing bytes */
else {
z->n++; /* luaZ_fill consumed first byte; put it back */
z->p--;
}
}
m = (n <= z->n) ? n : z->n; /* min. between n and z->n */
memcpy(b, z->p, m);
z->n -= m;
z->p += m;
b = (char *)b + m;
n -= m;
}
return 0;
}
Lua Tests¶
libs¶
#include "lua.h"
#include "lauxlib.h"
static int id (lua_State *L) {
return lua_gettop(L);
}
static const struct luaL_Reg funcs[] = {
{"id", id},
{NULL, NULL}
};
/* function used by lib11.c */
LUAMOD_API int lib1_export (lua_State *L) {
lua_pushstring(L, "exported");
return 1;
}
LUAMOD_API int onefunction (lua_State *L) {
luaL_checkversion(L);
lua_settop(L, 2);
lua_pushvalue(L, 1);
return 2;
}
LUAMOD_API int anotherfunc (lua_State *L) {
luaL_checkversion(L);
lua_pushfstring(L, "%d%%%d\n", (int)lua_tointeger(L, 1),
(int)lua_tointeger(L, 2));
return 1;
}
LUAMOD_API int luaopen_lib1_sub (lua_State *L) {
lua_setglobal(L, "y"); /* 2nd arg: extra value (file name) */
lua_setglobal(L, "x"); /* 1st arg: module name */
luaL_newlib(L, funcs);
return 1;
}
#include "lua.h"
#include "lauxlib.h"
static int id (lua_State *L) {
return lua_gettop(L);
}
static const struct luaL_Reg funcs[] = {
{"id", id},
{NULL, NULL}
};
LUAMOD_API int luaopen_lib2 (lua_State *L) {
lua_settop(L, 2);
lua_setglobal(L, "y"); /* y gets 2nd parameter */
lua_setglobal(L, "x"); /* x gets 1st parameter */
luaL_newlib(L, funcs);
return 1;
}
ltests¶
/*
** $Id: ltests.c $
** Internal Module for Debugging of the Lua Implementation
** See Copyright Notice in lua.h
*/
#define ltests_c
#define LUA_CORE
#include "lprefix.h"
#include <limits.h>
#include <setjmp.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lua.h"
#include "lapi.h"
#include "lauxlib.h"
#include "lcode.h"
#include "lctype.h"
#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "lmem.h"
#include "lopcodes.h"
#include "lopnames.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "lualib.h"
/*
** The whole module only makes sense with LUA_DEBUG on
*/
#if defined(LUA_DEBUG)
void *l_Trick = 0;
#define obj_at(L,k) s2v(L->ci->func + (k))
static int runC (lua_State *L, lua_State *L1, const char *pc);
static void setnameval (lua_State *L, const char *name, int val) {
lua_pushinteger(L, val);
lua_setfield(L, -2, name);
}
static void pushobject (lua_State *L, const TValue *o) {
setobj2s(L, L->top, o);
api_incr_top(L);
}
static void badexit (const char *fmt, const char *s1, const char *s2) {
fprintf(stderr, fmt, s1);
if (s2)
fprintf(stderr, "extra info: %s\n", s2);
/* avoid assertion failures when exiting */
l_memcontrol.numblocks = l_memcontrol.total = 0;
exit(EXIT_FAILURE);
}
static int tpanic (lua_State *L) {
const char *msg = lua_tostring(L, -1);
if (msg == NULL) msg = "error object is not a string";
return (badexit("PANIC: unprotected error in call to Lua API (%s)\n",
msg, NULL),
0); /* do not return to Lua */
}
/*
** Warning function for tests. First, it concatenates all parts of
** a warning in buffer 'buff'. Then, it has three modes:
** - 0.normal: messages starting with '#' are shown on standard output;
** - other messages abort the tests (they represent real warning
** conditions; the standard tests should not generate these conditions
** unexpectedly);
** - 1.allow: all messages are shown;
** - 2.store: all warnings go to the global '_WARN';
*/
static void warnf (void *ud, const char *msg, int tocont) {
lua_State *L = cast(lua_State *, ud);
static char buff[200] = ""; /* should be enough for tests... */
static int onoff = 0;
static int mode = 0; /* start in normal mode */
static int lasttocont = 0;
if (!lasttocont && !tocont && *msg == '@') { /* control message? */
if (buff[0] != '\0')
badexit("Control warning during warning: %s\naborting...\n", msg, buff);
if (strcmp(msg, "@off") == 0)
onoff = 0;
else if (strcmp(msg, "@on") == 0)
onoff = 1;
else if (strcmp(msg, "@normal") == 0)
mode = 0;
else if (strcmp(msg, "@allow") == 0)
mode = 1;
else if (strcmp(msg, "@store") == 0)
mode = 2;
else
badexit("Invalid control warning in test mode: %s\naborting...\n",
msg, NULL);
return;
}
lasttocont = tocont;
if (strlen(msg) >= sizeof(buff) - strlen(buff))
badexit("warnf-buffer overflow (%s)\n", msg, buff);
strcat(buff, msg); /* add new message to current warning */
if (!tocont) { /* message finished? */
lua_unlock(L);
if (lua_getglobal(L, "_WARN") == LUA_TNIL)
lua_pop(L, 1); /* ok, no previous unexpected warning */
else {
badexit("Unhandled warning in store mode: %s\naborting...\n",
lua_tostring(L, -1), buff);
}
lua_lock(L);
switch (mode) {
case 0: { /* normal */
if (buff[0] != '#' && onoff) /* unexpected warning? */
badexit("Unexpected warning in test mode: %s\naborting...\n",
buff, NULL);
} /* FALLTHROUGH */
case 1: { /* allow */
if (onoff)
fprintf(stderr, "Lua warning: %s\n", buff); /* print warning */
break;
}
case 2: { /* store */
lua_unlock(L);
lua_pushstring(L, buff);
lua_setglobal(L, "_WARN"); /* assign message to global '_WARN' */
lua_lock(L);
buff[0] = '\0'; /* prepare buffer for next warning */
break;
}
}
buff[0] = '\0'; /* prepare buffer for next warning */
}
}
/*
** {======================================================================
** Controlled version for realloc.
** =======================================================================
*/
#define MARK 0x55 /* 01010101 (a nice pattern) */
typedef union Header {
LUAI_MAXALIGN;
struct {
size_t size;
int type;
} d;
} Header;
#if !defined(EXTERNMEMCHECK)
/* full memory check */
#define MARKSIZE 16 /* size of marks after each block */
#define fillmem(mem,size) memset(mem, -MARK, size)
#else
/* external memory check: don't do it twice */
#define MARKSIZE 0
#define fillmem(mem,size) /* empty */
#endif
Memcontrol l_memcontrol =
{0UL, 0UL, 0UL, 0UL, (~0UL), {0UL, 0UL, 0UL, 0UL, 0UL, 0UL, 0UL, 0UL, 0UL}};
static void freeblock (Memcontrol *mc, Header *block) {
if (block) {
size_t size = block->d.size;
int i;
for (i = 0; i < MARKSIZE; i++) /* check marks after block */
lua_assert(*(cast_charp(block + 1) + size + i) == MARK);
mc->objcount[block->d.type]--;
fillmem(block, sizeof(Header) + size + MARKSIZE); /* erase block */
free(block); /* actually free block */
mc->numblocks--; /* update counts */
mc->total -= size;
}
}
void *debug_realloc (void *ud, void *b, size_t oldsize, size_t size) {
Memcontrol *mc = cast(Memcontrol *, ud);
Header *block = cast(Header *, b);
int type;
if (mc->memlimit == 0) { /* first time? */
char *limit = getenv("MEMLIMIT"); /* initialize memory limit */
mc->memlimit = limit ? strtoul(limit, NULL, 10) : ULONG_MAX;
}
if (block == NULL) {
type = (oldsize < LUA_NUMTAGS) ? oldsize : 0;
oldsize = 0;
}
else {
block--; /* go to real header */
type = block->d.type;
lua_assert(oldsize == block->d.size);
}
if (size == 0) {
freeblock(mc, block);
return NULL;
}
if (mc->countlimit != ~0UL && size != oldsize) { /* count limit in use? */
if (mc->countlimit == 0)
return NULL; /* fake a memory allocation error */
mc->countlimit--;
}
if (size > oldsize && mc->total+size-oldsize > mc->memlimit)
return NULL; /* fake a memory allocation error */
else {
Header *newblock;
int i;
size_t commonsize = (oldsize < size) ? oldsize : size;
size_t realsize = sizeof(Header) + size + MARKSIZE;
if (realsize < size) return NULL; /* arithmetic overflow! */
newblock = cast(Header *, malloc(realsize)); /* alloc a new block */
if (newblock == NULL)
return NULL; /* really out of memory? */
if (block) {
memcpy(newblock + 1, block + 1, commonsize); /* copy old contents */
freeblock(mc, block); /* erase (and check) old copy */
}
/* initialize new part of the block with something weird */
fillmem(cast_charp(newblock + 1) + commonsize, size - commonsize);
/* initialize marks after block */
for (i = 0; i < MARKSIZE; i++)
*(cast_charp(newblock + 1) + size + i) = MARK;
newblock->d.size = size;
newblock->d.type = type;
mc->total += size;
if (mc->total > mc->maxmem)
mc->maxmem = mc->total;
mc->numblocks++;
mc->objcount[type]++;
return newblock + 1;
}
}
/* }====================================================================== */
/*
** {======================================================
** Functions to check memory consistency
** =======================================================
*/
/*
** Check GC invariants. For incremental mode, a black object cannot
** point to a white one. For generational mode, really old objects
** cannot point to young objects. Both old1 and touched2 objects
** cannot point to new objects (but can point to survivals).
** (Threads and open upvalues, despite being marked "really old",
** continue to be visited in all collections, and therefore can point to
** new objects. They, and only they, are old but gray.)
*/
static int testobjref1 (global_State *g, GCObject *f, GCObject *t) {
if (isdead(g,t)) return 0;
if (issweepphase(g))
return 1; /* no invariants */
else if (g->gckind == KGC_INC)
return !(isblack(f) && iswhite(t)); /* basic incremental invariant */
else { /* generational mode */
if ((getage(f) == G_OLD && isblack(f)) && !isold(t))
return 0;
if (((getage(f) == G_OLD1 || getage(f) == G_TOUCHED2) && isblack(f)) &&
getage(t) == G_NEW)
return 0;
return 1;
}
}
static void printobj (global_State *g, GCObject *o) {
printf("||%s(%p)-%c%c(%02X)||",
ttypename(novariant(o->tt)), (void *)o,
isdead(g,o) ? 'd' : isblack(o) ? 'b' : iswhite(o) ? 'w' : 'g',
"ns01oTt"[getage(o)], o->marked);
if (o->tt == LUA_VSHRSTR || o->tt == LUA_VLNGSTR)
printf(" '%s'", getstr(gco2ts(o)));
}
static int testobjref (global_State *g, GCObject *f, GCObject *t) {
int r1 = testobjref1(g, f, t);
if (!r1) {
printf("%d(%02X) - ", g->gcstate, g->currentwhite);
printobj(g, f);
printf(" -> ");
printobj(g, t);
printf("\n");
}
return r1;
}
#define checkobjref(g,f,t) \
{ if (t) lua_longassert(testobjref(g,f,obj2gco(t))); }
static void checkvalref (global_State *g, GCObject *f, const TValue *t) {
lua_assert(!iscollectable(t) ||
(righttt(t) && testobjref(g, f, gcvalue(t))));
}
static void checktable (global_State *g, Table *h) {
unsigned int i;
unsigned int asize = luaH_realasize(h);
Node *n, *limit = gnode(h, sizenode(h));
GCObject *hgc = obj2gco(h);
checkobjref(g, hgc, h->metatable);
for (i = 0; i < asize; i++)
checkvalref(g, hgc, &h->array[i]);
for (n = gnode(h, 0); n < limit; n++) {
if (!isempty(gval(n))) {
TValue k;
getnodekey(g->mainthread, &k, n);
lua_assert(!keyisnil(n));
checkvalref(g, hgc, &k);
checkvalref(g, hgc, gval(n));
}
}
}
static void checkudata (global_State *g, Udata *u) {
int i;
GCObject *hgc = obj2gco(u);
checkobjref(g, hgc, u->metatable);
for (i = 0; i < u->nuvalue; i++)
checkvalref(g, hgc, &u->uv[i].uv);
}
/*
** All marks are conditional because a GC may happen while the
** prototype is still being created
*/
static void checkproto (global_State *g, Proto *f) {
int i;
GCObject *fgc = obj2gco(f);
checkobjref(g, fgc, f->source);
for (i=0; i<f->sizek; i++) {
if (ttisstring(f->k + i))
checkobjref(g, fgc, tsvalue(f->k + i));
}
for (i=0; i<f->sizeupvalues; i++)
checkobjref(g, fgc, f->upvalues[i].name);
for (i=0; i<f->sizep; i++)
checkobjref(g, fgc, f->p[i]);
for (i=0; i<f->sizelocvars; i++)
checkobjref(g, fgc, f->locvars[i].varname);
}
static void checkCclosure (global_State *g, CClosure *cl) {
GCObject *clgc = obj2gco(cl);
int i;
for (i = 0; i < cl->nupvalues; i++)
checkvalref(g, clgc, &cl->upvalue[i]);
}
static void checkLclosure (global_State *g, LClosure *cl) {
GCObject *clgc = obj2gco(cl);
int i;
checkobjref(g, clgc, cl->p);
for (i=0; i<cl->nupvalues; i++) {
UpVal *uv = cl->upvals[i];
if (uv) {
checkobjref(g, clgc, uv);
if (!upisopen(uv))
checkvalref(g, obj2gco(uv), uv->v);
}
}
}
static int lua_checkpc (CallInfo *ci) {
if (!isLua(ci)) return 1;
else {
StkId f = ci->func;
Proto *p = clLvalue(s2v(f))->p;
return p->code <= ci->u.l.savedpc &&
ci->u.l.savedpc <= p->code + p->sizecode;
}
}
static void checkstack (global_State *g, lua_State *L1) {
StkId o;
CallInfo *ci;
UpVal *uv;
lua_assert(!isdead(g, L1));
if (L1->stack == NULL) { /* incomplete thread? */
lua_assert(L1->stacksize == 0 && L1->openupval == NULL &&
L1->ci == NULL);
return;
}
for (uv = L1->openupval; uv != NULL; uv = uv->u.open.next)
lua_assert(upisopen(uv)); /* must be open */
for (ci = L1->ci; ci != NULL; ci = ci->previous) {
lua_assert(ci->top <= L1->stack_last);
lua_assert(lua_checkpc(ci));
}
for (o = L1->stack; o < L1->stack_last + EXTRA_STACK; o++)
checkliveness(L1, s2v(o)); /* entire stack must have valid values */
}
static void checkrefs (global_State *g, GCObject *o) {
switch (o->tt) {
case LUA_VUSERDATA: {
checkudata(g, gco2u(o));
break;
}
case LUA_VUPVAL: {
checkvalref(g, o, gco2upv(o)->v);
break;
}
case LUA_VTABLE: {
checktable(g, gco2t(o));
break;
}
case LUA_VTHREAD: {
checkstack(g, gco2th(o));
break;
}
case LUA_VLCL: {
checkLclosure(g, gco2lcl(o));
break;
}
case LUA_VCCL: {
checkCclosure(g, gco2ccl(o));
break;
}
case LUA_VPROTO: {
checkproto(g, gco2p(o));
break;
}
case LUA_VSHRSTR:
case LUA_VLNGSTR: {
lua_assert(!isgray(o)); /* strings are never gray */
break;
}
default: lua_assert(0);
}
}
/*
** Check consistency of an object:
** - Dead objects can only happen in the 'allgc' list during a sweep
** phase (controlled by the caller through 'maybedead').
** - During pause, all objects must be white.
** - In generational mode:
** * objects must be old enough for their lists ('listage').
** * old objects cannot be white.
** * old objects must be black, except for 'touched1', 'old0',
** threads, and open upvalues.
*/
static void checkobject (global_State *g, GCObject *o, int maybedead,
int listage) {
if (isdead(g, o))
lua_assert(maybedead);
else {
lua_assert(g->gcstate != GCSpause || iswhite(o));
if (g->gckind == KGC_GEN) { /* generational mode? */
lua_assert(getage(o) >= listage);
lua_assert(!iswhite(o) || !isold(o));
if (isold(o)) {
lua_assert(isblack(o) ||
getage(o) == G_TOUCHED1 ||
getage(o) == G_OLD0 ||
o->tt == LUA_VTHREAD ||
(o->tt == LUA_VUPVAL && upisopen(gco2upv(o))));
}
}
checkrefs(g, o);
}
}
static void checkgraylist (global_State *g, GCObject *o) {
((void)g); /* better to keep it available if we need to print an object */
while (o) {
lua_assert(isgray(o) || getage(o) == G_TOUCHED2);
switch (o->tt) {
case LUA_VTABLE: o = gco2t(o)->gclist; break;
case LUA_VLCL: o = gco2lcl(o)->gclist; break;
case LUA_VCCL: o = gco2ccl(o)->gclist; break;
case LUA_VTHREAD: o = gco2th(o)->gclist; break;
case LUA_VPROTO: o = gco2p(o)->gclist; break;
case LUA_VUSERDATA:
lua_assert(gco2u(o)->nuvalue > 0);
o = gco2u(o)->gclist;
break;
default: lua_assert(0); /* other objects cannot be in a gray list */
}
}
}
/*
** Check objects in gray lists.
*/
static void checkgrays (global_State *g) {
if (!keepinvariant(g)) return;
checkgraylist(g, g->gray);
checkgraylist(g, g->grayagain);
checkgraylist(g, g->weak);
checkgraylist(g, g->ephemeron);
}
static void checklist (global_State *g, int maybedead, int tof,
GCObject *newl, GCObject *survival, GCObject *old, GCObject *reallyold) {
GCObject *o;
for (o = newl; o != survival; o = o->next) {
checkobject(g, o, maybedead, G_NEW);
lua_assert(!tof == !tofinalize(o));
}
for (o = survival; o != old; o = o->next) {
checkobject(g, o, 0, G_SURVIVAL);
lua_assert(!tof == !tofinalize(o));
}
for (o = old; o != reallyold; o = o->next) {
checkobject(g, o, 0, G_OLD1);
lua_assert(!tof == !tofinalize(o));
}
for (o = reallyold; o != NULL; o = o->next) {
checkobject(g, o, 0, G_OLD);
lua_assert(!tof == !tofinalize(o));
}
}
int lua_checkmemory (lua_State *L) {
global_State *g = G(L);
GCObject *o;
int maybedead;
if (keepinvariant(g)) {
lua_assert(!iswhite(g->mainthread));
lua_assert(!iswhite(gcvalue(&g->l_registry)));
}
lua_assert(!isdead(g, gcvalue(&g->l_registry)));
lua_assert(g->sweepgc == NULL || issweepphase(g));
checkgrays(g);
/* check 'fixedgc' list */
for (o = g->fixedgc; o != NULL; o = o->next) {
lua_assert(o->tt == LUA_VSHRSTR && isgray(o) && getage(o) == G_OLD);
}
/* check 'allgc' list */
maybedead = (GCSatomic < g->gcstate && g->gcstate <= GCSswpallgc);
checklist(g, maybedead, 0, g->allgc, g->survival, g->old, g->reallyold);
/* check 'finobj' list */
checklist(g, 0, 1, g->finobj, g->finobjsur, g->finobjold, g->finobjrold);
/* check 'tobefnz' list */
for (o = g->tobefnz; o != NULL; o = o->next) {
checkobject(g, o, 0, G_NEW);
lua_assert(tofinalize(o));
lua_assert(o->tt == LUA_VUSERDATA || o->tt == LUA_VTABLE);
}
return 0;
}
/* }====================================================== */
/*
** {======================================================
** Disassembler
** =======================================================
*/
static char *buildop (Proto *p, int pc, char *buff) {
char *obuff = buff;
Instruction i = p->code[pc];
OpCode o = GET_OPCODE(i);
const char *name = opnames[o];
int line = luaG_getfuncline(p, pc);
int lineinfo = (p->lineinfo != NULL) ? p->lineinfo[pc] : 0;
if (lineinfo == ABSLINEINFO)
buff += sprintf(buff, "(__");
else
buff += sprintf(buff, "(%2d", lineinfo);
buff += sprintf(buff, " - %4d) %4d - ", line, pc);
switch (getOpMode(o)) {
case iABC:
sprintf(buff, "%-12s%4d %4d %4d%s", name,
GETARG_A(i), GETARG_B(i), GETARG_C(i),
GETARG_k(i) ? " (k)" : "");
break;
case iABx:
sprintf(buff, "%-12s%4d %4d", name, GETARG_A(i), GETARG_Bx(i));
break;
case iAsBx:
sprintf(buff, "%-12s%4d %4d", name, GETARG_A(i), GETARG_sBx(i));
break;
case iAx:
sprintf(buff, "%-12s%4d", name, GETARG_Ax(i));
break;
case isJ:
sprintf(buff, "%-12s%4d", name, GETARG_sJ(i));
break;
}
return obuff;
}
#if 0
void luaI_printcode (Proto *pt, int size) {
int pc;
for (pc=0; pc<size; pc++) {
char buff[100];
printf("%s\n", buildop(pt, pc, buff));
}
printf("-------\n");
}
void luaI_printinst (Proto *pt, int pc) {
char buff[100];
printf("%s\n", buildop(pt, pc, buff));
}
#endif
static int listcode (lua_State *L) {
int pc;
Proto *p;
luaL_argcheck(L, lua_isfunction(L, 1) && !lua_iscfunction(L, 1),
1, "Lua function expected");
p = getproto(obj_at(L, 1));
lua_newtable(L);
setnameval(L, "maxstack", p->maxstacksize);
setnameval(L, "numparams", p->numparams);
for (pc=0; pc<p->sizecode; pc++) {
char buff[100];
lua_pushinteger(L, pc+1);
lua_pushstring(L, buildop(p, pc, buff));
lua_settable(L, -3);
}
return 1;
}
static int printcode (lua_State *L) {
int pc;
Proto *p;
luaL_argcheck(L, lua_isfunction(L, 1) && !lua_iscfunction(L, 1),
1, "Lua function expected");
p = getproto(obj_at(L, 1));
printf("maxstack: %d\n", p->maxstacksize);
printf("numparams: %d\n", p->numparams);
for (pc=0; pc<p->sizecode; pc++) {
char buff[100];
printf("%s\n", buildop(p, pc, buff));
}
return 0;
}
static int listk (lua_State *L) {
Proto *p;
int i;
luaL_argcheck(L, lua_isfunction(L, 1) && !lua_iscfunction(L, 1),
1, "Lua function expected");
p = getproto(obj_at(L, 1));
lua_createtable(L, p->sizek, 0);
for (i=0; i<p->sizek; i++) {
pushobject(L, p->k+i);
lua_rawseti(L, -2, i+1);
}
return 1;
}
static int listabslineinfo (lua_State *L) {
Proto *p;
int i;
luaL_argcheck(L, lua_isfunction(L, 1) && !lua_iscfunction(L, 1),
1, "Lua function expected");
p = getproto(obj_at(L, 1));
luaL_argcheck(L, p->abslineinfo != NULL, 1, "function has no debug info");
lua_createtable(L, 2 * p->sizeabslineinfo, 0);
for (i=0; i < p->sizeabslineinfo; i++) {
lua_pushinteger(L, p->abslineinfo[i].pc);
lua_rawseti(L, -2, 2 * i + 1);
lua_pushinteger(L, p->abslineinfo[i].line);
lua_rawseti(L, -2, 2 * i + 2);
}
return 1;
}
static int listlocals (lua_State *L) {
Proto *p;
int pc = cast_int(luaL_checkinteger(L, 2)) - 1;
int i = 0;
const char *name;
luaL_argcheck(L, lua_isfunction(L, 1) && !lua_iscfunction(L, 1),
1, "Lua function expected");
p = getproto(obj_at(L, 1));
while ((name = luaF_getlocalname(p, ++i, pc)) != NULL)
lua_pushstring(L, name);
return i-1;
}
/* }====================================================== */
static void printstack (lua_State *L) {
int i;
int n = lua_gettop(L);
for (i = 1; i <= n; i++) {
printf("%3d: %s\n", i, luaL_tolstring(L, i, NULL));
lua_pop(L, 1);
}
printf("\n");
}
static int get_limits (lua_State *L) {
lua_createtable(L, 0, 6);
setnameval(L, "IS32INT", LUAI_IS32INT);
setnameval(L, "MAXARG_Ax", MAXARG_Ax);
setnameval(L, "MAXARG_Bx", MAXARG_Bx);
setnameval(L, "OFFSET_sBx", OFFSET_sBx);
setnameval(L, "LFPF", LFIELDS_PER_FLUSH);
setnameval(L, "NUM_OPCODES", NUM_OPCODES);
return 1;
}
static int mem_query (lua_State *L) {
if (lua_isnone(L, 1)) {
lua_pushinteger(L, l_memcontrol.total);
lua_pushinteger(L, l_memcontrol.numblocks);
lua_pushinteger(L, l_memcontrol.maxmem);
return 3;
}
else if (lua_isnumber(L, 1)) {
unsigned long limit = cast(unsigned long, luaL_checkinteger(L, 1));
if (limit == 0) limit = ULONG_MAX;
l_memcontrol.memlimit = limit;
return 0;
}
else {
const char *t = luaL_checkstring(L, 1);
int i;
for (i = LUA_NUMTAGS - 1; i >= 0; i--) {
if (strcmp(t, ttypename(i)) == 0) {
lua_pushinteger(L, l_memcontrol.objcount[i]);
return 1;
}
}
return luaL_error(L, "unknown type '%s'", t);
}
}
static int alloc_count (lua_State *L) {
if (lua_isnone(L, 1))
l_memcontrol.countlimit = ~0L;
else
l_memcontrol.countlimit = luaL_checkinteger(L, 1);
return 0;
}
static int settrick (lua_State *L) {
if (ttisnil(obj_at(L, 1)))
l_Trick = NULL;
else
l_Trick = gcvalue(obj_at(L, 1));
return 0;
}
static int gc_color (lua_State *L) {
TValue *o;
luaL_checkany(L, 1);
o = obj_at(L, 1);
if (!iscollectable(o))
lua_pushstring(L, "no collectable");
else {
GCObject *obj = gcvalue(o);
lua_pushstring(L, isdead(G(L), obj) ? "dead" :
iswhite(obj) ? "white" :
isblack(obj) ? "black" : "gray");
}
return 1;
}
static int gc_age (lua_State *L) {
TValue *o;
luaL_checkany(L, 1);
o = obj_at(L, 1);
if (!iscollectable(o))
lua_pushstring(L, "no collectable");
else {
static const char *gennames[] = {"new", "survival", "old0", "old1",
"old", "touched1", "touched2"};
GCObject *obj = gcvalue(o);
lua_pushstring(L, gennames[getage(obj)]);
}
return 1;
}
static int gc_printobj (lua_State *L) {
TValue *o;
luaL_checkany(L, 1);
o = obj_at(L, 1);
if (!iscollectable(o))
printf("no collectable\n");
else {
GCObject *obj = gcvalue(o);
printobj(G(L), obj);
printf("\n");
}
return 0;
}
static int gc_state (lua_State *L) {
static const char *statenames[] = {
"propagate", "atomic", "enteratomic", "sweepallgc", "sweepfinobj",
"sweeptobefnz", "sweepend", "callfin", "pause", ""};
static const int states[] = {
GCSpropagate, GCSenteratomic, GCSatomic, GCSswpallgc, GCSswpfinobj,
GCSswptobefnz, GCSswpend, GCScallfin, GCSpause, -1};
int option = states[luaL_checkoption(L, 1, "", statenames)];
if (option == -1) {
lua_pushstring(L, statenames[G(L)->gcstate]);
return 1;
}
else {
global_State *g = G(L);
if (G(L)->gckind == KGC_GEN)
luaL_error(L, "cannot change states in generational mode");
lua_lock(L);
if (option < g->gcstate) { /* must cross 'pause'? */
luaC_runtilstate(L, bitmask(GCSpause)); /* run until pause */
}
luaC_runtilstate(L, bitmask(option));
lua_assert(G(L)->gcstate == option);
lua_unlock(L);
return 0;
}
}
static int hash_query (lua_State *L) {
if (lua_isnone(L, 2)) {
luaL_argcheck(L, lua_type(L, 1) == LUA_TSTRING, 1, "string expected");
lua_pushinteger(L, tsvalue(obj_at(L, 1))->hash);
}
else {
TValue *o = obj_at(L, 1);
Table *t;
luaL_checktype(L, 2, LUA_TTABLE);
t = hvalue(obj_at(L, 2));
lua_pushinteger(L, luaH_mainposition(t, o) - t->node);
}
return 1;
}
static int stacklevel (lua_State *L) {
unsigned long a = 0;
lua_pushinteger(L, (L->top - L->stack));
lua_pushinteger(L, (L->stack_last - L->stack));
lua_pushinteger(L, L->nCcalls);
lua_pushinteger(L, L->nci);
lua_pushinteger(L, (unsigned long)&a);
return 5;
}
static int table_query (lua_State *L) {
const Table *t;
int i = cast_int(luaL_optinteger(L, 2, -1));
unsigned int asize;
luaL_checktype(L, 1, LUA_TTABLE);
t = hvalue(obj_at(L, 1));
asize = luaH_realasize(t);
if (i == -1) {
lua_pushinteger(L, asize);
lua_pushinteger(L, allocsizenode(t));
lua_pushinteger(L, isdummy(t) ? 0 : t->lastfree - t->node);
lua_pushinteger(L, t->alimit);
return 4;
}
else if ((unsigned int)i < asize) {
lua_pushinteger(L, i);
pushobject(L, &t->array[i]);
lua_pushnil(L);
}
else if ((i -= asize) < sizenode(t)) {
TValue k;
getnodekey(L, &k, gnode(t, i));
if (!isempty(gval(gnode(t, i))) ||
ttisnil(&k) ||
ttisnumber(&k)) {
pushobject(L, &k);
}
else
lua_pushliteral(L, "<undef>");
pushobject(L, gval(gnode(t, i)));
if (gnext(&t->node[i]) != 0)
lua_pushinteger(L, gnext(&t->node[i]));
else
lua_pushnil(L);
}
return 3;
}
static int string_query (lua_State *L) {
stringtable *tb = &G(L)->strt;
int s = cast_int(luaL_optinteger(L, 1, 0)) - 1;
if (s == -1) {
lua_pushinteger(L ,tb->size);
lua_pushinteger(L ,tb->nuse);
return 2;
}
else if (s < tb->size) {
TString *ts;
int n = 0;
for (ts = tb->hash[s]; ts != NULL; ts = ts->u.hnext) {
setsvalue2s(L, L->top, ts);
api_incr_top(L);
n++;
}
return n;
}
else return 0;
}
static int tref (lua_State *L) {
int level = lua_gettop(L);
luaL_checkany(L, 1);
lua_pushvalue(L, 1);
lua_pushinteger(L, luaL_ref(L, LUA_REGISTRYINDEX));
lua_assert(lua_gettop(L) == level+1); /* +1 for result */
return 1;
}
static int getref (lua_State *L) {
int level = lua_gettop(L);
lua_rawgeti(L, LUA_REGISTRYINDEX, luaL_checkinteger(L, 1));
lua_assert(lua_gettop(L) == level+1);
return 1;
}
static int unref (lua_State *L) {
int level = lua_gettop(L);
luaL_unref(L, LUA_REGISTRYINDEX, cast_int(luaL_checkinteger(L, 1)));
lua_assert(lua_gettop(L) == level);
return 0;
}
static int upvalue (lua_State *L) {
int n = cast_int(luaL_checkinteger(L, 2));
luaL_checktype(L, 1, LUA_TFUNCTION);
if (lua_isnone(L, 3)) {
const char *name = lua_getupvalue(L, 1, n);
if (name == NULL) return 0;
lua_pushstring(L, name);
return 2;
}
else {
const char *name = lua_setupvalue(L, 1, n);
lua_pushstring(L, name);
return 1;
}
}
static int newuserdata (lua_State *L) {
size_t size = cast_sizet(luaL_optinteger(L, 1, 0));
int nuv = luaL_optinteger(L, 2, 0);
char *p = cast_charp(lua_newuserdatauv(L, size, nuv));
while (size--) *p++ = '\0';
return 1;
}
static int pushuserdata (lua_State *L) {
lua_Integer u = luaL_checkinteger(L, 1);
lua_pushlightuserdata(L, cast_voidp(cast_sizet(u)));
return 1;
}
static int udataval (lua_State *L) {
lua_pushinteger(L, cast(long, lua_touserdata(L, 1)));
return 1;
}
static int doonnewstack (lua_State *L) {
lua_State *L1 = lua_newthread(L);
size_t l;
const char *s = luaL_checklstring(L, 1, &l);
int status = luaL_loadbuffer(L1, s, l, s);
if (status == LUA_OK)
status = lua_pcall(L1, 0, 0, 0);
lua_pushinteger(L, status);
return 1;
}
static int s2d (lua_State *L) {
lua_pushnumber(L, cast_num(*cast(const double *, luaL_checkstring(L, 1))));
return 1;
}
static int d2s (lua_State *L) {
double d = cast(double, luaL_checknumber(L, 1));
lua_pushlstring(L, cast_charp(&d), sizeof(d));
return 1;
}
static int num2int (lua_State *L) {
lua_pushinteger(L, lua_tointeger(L, 1));
return 1;
}
static int newstate (lua_State *L) {
void *ud;
lua_Alloc f = lua_getallocf(L, &ud);
lua_State *L1 = lua_newstate(f, ud);
if (L1) {
lua_atpanic(L1, tpanic);
lua_pushlightuserdata(L, L1);
}
else
lua_pushnil(L);
return 1;
}
static lua_State *getstate (lua_State *L) {
lua_State *L1 = cast(lua_State *, lua_touserdata(L, 1));
luaL_argcheck(L, L1 != NULL, 1, "state expected");
return L1;
}
static int loadlib (lua_State *L) {
static const luaL_Reg libs[] = {
{LUA_GNAME, luaopen_base},
{"coroutine", luaopen_coroutine},
{"debug", luaopen_debug},
{"io", luaopen_io},
{"os", luaopen_os},
{"math", luaopen_math},
{"string", luaopen_string},
{"table", luaopen_table},
{"T", luaB_opentests},
{NULL, NULL}
};
lua_State *L1 = getstate(L);
int i;
luaL_requiref(L1, "package", luaopen_package, 0);
lua_assert(lua_type(L1, -1) == LUA_TTABLE);
/* 'requiref' should not reload module already loaded... */
luaL_requiref(L1, "package", NULL, 1); /* seg. fault if it reloads */
/* ...but should return the same module */
lua_assert(lua_compare(L1, -1, -2, LUA_OPEQ));
luaL_getsubtable(L1, LUA_REGISTRYINDEX, LUA_PRELOAD_TABLE);
for (i = 0; libs[i].name; i++) {
lua_pushcfunction(L1, libs[i].func);
lua_setfield(L1, -2, libs[i].name);
}
return 0;
}
static int closestate (lua_State *L) {
lua_State *L1 = getstate(L);
lua_close(L1);
return 0;
}
static int doremote (lua_State *L) {
lua_State *L1 = getstate(L);
size_t lcode;
const char *code = luaL_checklstring(L, 2, &lcode);
int status;
lua_settop(L1, 0);
status = luaL_loadbuffer(L1, code, lcode, code);
if (status == LUA_OK)
status = lua_pcall(L1, 0, LUA_MULTRET, 0);
if (status != LUA_OK) {
lua_pushnil(L);
lua_pushstring(L, lua_tostring(L1, -1));
lua_pushinteger(L, status);
return 3;
}
else {
int i = 0;
while (!lua_isnone(L1, ++i))
lua_pushstring(L, lua_tostring(L1, i));
lua_pop(L1, i-1);
return i-1;
}
}
static int log2_aux (lua_State *L) {
unsigned int x = (unsigned int)luaL_checkinteger(L, 1);
lua_pushinteger(L, luaO_ceillog2(x));
return 1;
}
struct Aux { jmp_buf jb; const char *paniccode; lua_State *L; };
/*
** does a long-jump back to "main program".
*/
static int panicback (lua_State *L) {
struct Aux *b;
lua_checkstack(L, 1); /* open space for 'Aux' struct */
lua_getfield(L, LUA_REGISTRYINDEX, "_jmpbuf"); /* get 'Aux' struct */
b = (struct Aux *)lua_touserdata(L, -1);
lua_pop(L, 1); /* remove 'Aux' struct */
runC(b->L, L, b->paniccode); /* run optional panic code */
longjmp(b->jb, 1);
return 1; /* to avoid warnings */
}
static int checkpanic (lua_State *L) {
struct Aux b;
void *ud;
lua_State *L1;
const char *code = luaL_checkstring(L, 1);
lua_Alloc f = lua_getallocf(L, &ud);
b.paniccode = luaL_optstring(L, 2, "");
b.L = L;
L1 = lua_newstate(f, ud); /* create new state */
if (L1 == NULL) { /* error? */
lua_pushnil(L);
return 1;
}
lua_atpanic(L1, panicback); /* set its panic function */
lua_pushlightuserdata(L1, &b);
lua_setfield(L1, LUA_REGISTRYINDEX, "_jmpbuf"); /* store 'Aux' struct */
if (setjmp(b.jb) == 0) { /* set jump buffer */
runC(L, L1, code); /* run code unprotected */
lua_pushliteral(L, "no errors");
}
else { /* error handling */
/* move error message to original state */
lua_pushstring(L, lua_tostring(L1, -1));
}
lua_close(L1);
return 1;
}
/*
** {====================================================================
** function to test the API with C. It interprets a kind of assembler
** language with calls to the API, so the test can be driven by Lua code
** =====================================================================
*/
static void sethookaux (lua_State *L, int mask, int count, const char *code);
static const char *const delimits = " \t\n,;";
static void skip (const char **pc) {
for (;;) {
if (**pc != '\0' && strchr(delimits, **pc)) (*pc)++;
else if (**pc == '#') { /* comment? */
while (**pc != '\n' && **pc != '\0') (*pc)++; /* until end-of-line */
}
else break;
}
}
static int getnum_aux (lua_State *L, lua_State *L1, const char **pc) {
int res = 0;
int sig = 1;
skip(pc);
if (**pc == '.') {
res = cast_int(lua_tointeger(L1, -1));
lua_pop(L1, 1);
(*pc)++;
return res;
}
else if (**pc == '*') {
res = lua_gettop(L1);
(*pc)++;
return res;
}
else if (**pc == '-') {
sig = -1;
(*pc)++;
}
if (!lisdigit(cast_uchar(**pc)))
luaL_error(L, "number expected (%s)", *pc);
while (lisdigit(cast_uchar(**pc))) res = res*10 + (*(*pc)++) - '0';
return sig*res;
}
static const char *getstring_aux (lua_State *L, char *buff, const char **pc) {
int i = 0;
skip(pc);
if (**pc == '"' || **pc == '\'') { /* quoted string? */
int quote = *(*pc)++;
while (**pc != quote) {
if (**pc == '\0') luaL_error(L, "unfinished string in C script");
buff[i++] = *(*pc)++;
}
(*pc)++;
}
else {
while (**pc != '\0' && !strchr(delimits, **pc))
buff[i++] = *(*pc)++;
}
buff[i] = '\0';
return buff;
}
static int getindex_aux (lua_State *L, lua_State *L1, const char **pc) {
skip(pc);
switch (*(*pc)++) {
case 'R': return LUA_REGISTRYINDEX;
case 'G': return luaL_error(L, "deprecated index 'G'");
case 'U': return lua_upvalueindex(getnum_aux(L, L1, pc));
default: (*pc)--; return getnum_aux(L, L1, pc);
}
}
static void pushcode (lua_State *L, int code) {
static const char *const codes[] = {"OK", "YIELD", "ERRRUN",
"ERRSYNTAX", MEMERRMSG, "ERRGCMM", "ERRERR"};
lua_pushstring(L, codes[code]);
}
#define EQ(s1) (strcmp(s1, inst) == 0)
#define getnum (getnum_aux(L, L1, &pc))
#define getstring (getstring_aux(L, buff, &pc))
#define getindex (getindex_aux(L, L1, &pc))
static int testC (lua_State *L);
static int Cfunck (lua_State *L, int status, lua_KContext ctx);
/*
** arithmetic operation encoding for 'arith' instruction
** LUA_OPIDIV -> \
** LUA_OPSHL -> <
** LUA_OPSHR -> >
** LUA_OPUNM -> _
** LUA_OPBNOT -> !
*/
static const char ops[] = "+-*%^/\\&|~<>_!";
static int runC (lua_State *L, lua_State *L1, const char *pc) {
char buff[300];
int status = 0;
if (pc == NULL) return luaL_error(L, "attempt to runC null script");
for (;;) {
const char *inst = getstring;
if EQ("") return 0;
else if EQ("absindex") {
lua_pushnumber(L1, lua_absindex(L1, getindex));
}
else if EQ("append") {
int t = getindex;
int i = lua_rawlen(L1, t);
lua_rawseti(L1, t, i + 1);
}
else if EQ("arith") {
int op;
skip(&pc);
op = strchr(ops, *pc++) - ops;
lua_arith(L1, op);
}
else if EQ("call") {
int narg = getnum;
int nres = getnum;
lua_call(L1, narg, nres);
}
else if EQ("callk") {
int narg = getnum;
int nres = getnum;
int i = getindex;
lua_callk(L1, narg, nres, i, Cfunck);
}
else if EQ("checkstack") {
int sz = getnum;
const char *msg = getstring;
if (*msg == '\0')
msg = NULL; /* to test 'luaL_checkstack' with no message */
luaL_checkstack(L1, sz, msg);
}
else if EQ("rawcheckstack") {
int sz = getnum;
lua_pushboolean(L1, lua_checkstack(L1, sz));
}
else if EQ("compare") {
const char *opt = getstring; /* EQ, LT, or LE */
int op = (opt[0] == 'E') ? LUA_OPEQ
: (opt[1] == 'T') ? LUA_OPLT : LUA_OPLE;
int a = getindex;
int b = getindex;
lua_pushboolean(L1, lua_compare(L1, a, b, op));
}
else if EQ("concat") {
lua_concat(L1, getnum);
}
else if EQ("copy") {
int f = getindex;
lua_copy(L1, f, getindex);
}
else if EQ("func2num") {
lua_CFunction func = lua_tocfunction(L1, getindex);
lua_pushnumber(L1, cast_sizet(func));
}
else if EQ("getfield") {
int t = getindex;
lua_getfield(L1, t, getstring);
}
else if EQ("getglobal") {
lua_getglobal(L1, getstring);
}
else if EQ("getmetatable") {
if (lua_getmetatable(L1, getindex) == 0)
lua_pushnil(L1);
}
else if EQ("gettable") {
lua_gettable(L1, getindex);
}
else if EQ("gettop") {
lua_pushinteger(L1, lua_gettop(L1));
}
else if EQ("gsub") {
int a = getnum; int b = getnum; int c = getnum;
luaL_gsub(L1, lua_tostring(L1, a),
lua_tostring(L1, b),
lua_tostring(L1, c));
}
else if EQ("insert") {
lua_insert(L1, getnum);
}
else if EQ("iscfunction") {
lua_pushboolean(L1, lua_iscfunction(L1, getindex));
}
else if EQ("isfunction") {
lua_pushboolean(L1, lua_isfunction(L1, getindex));
}
else if EQ("isnil") {
lua_pushboolean(L1, lua_isnil(L1, getindex));
}
else if EQ("isnull") {
lua_pushboolean(L1, lua_isnone(L1, getindex));
}
else if EQ("isnumber") {
lua_pushboolean(L1, lua_isnumber(L1, getindex));
}
else if EQ("isstring") {
lua_pushboolean(L1, lua_isstring(L1, getindex));
}
else if EQ("istable") {
lua_pushboolean(L1, lua_istable(L1, getindex));
}
else if EQ("isudataval") {
lua_pushboolean(L1, lua_islightuserdata(L1, getindex));
}
else if EQ("isuserdata") {
lua_pushboolean(L1, lua_isuserdata(L1, getindex));
}
else if EQ("len") {
lua_len(L1, getindex);
}
else if EQ("Llen") {
lua_pushinteger(L1, luaL_len(L1, getindex));
}
else if EQ("loadfile") {
luaL_loadfile(L1, luaL_checkstring(L1, getnum));
}
else if EQ("loadstring") {
const char *s = luaL_checkstring(L1, getnum);
luaL_loadstring(L1, s);
}
else if EQ("newmetatable") {
lua_pushboolean(L1, luaL_newmetatable(L1, getstring));
}
else if EQ("newtable") {
lua_newtable(L1);
}
else if EQ("newthread") {
lua_newthread(L1);
}
else if EQ("resetthread") {
lua_pushinteger(L1, lua_resetthread(L1));
}
else if EQ("newuserdata") {
lua_newuserdata(L1, getnum);
}
else if EQ("next") {
lua_next(L1, -2);
}
else if EQ("objsize") {
lua_pushinteger(L1, lua_rawlen(L1, getindex));
}
else if EQ("pcall") {
int narg = getnum;
int nres = getnum;
status = lua_pcall(L1, narg, nres, getnum);
}
else if EQ("pcallk") {
int narg = getnum;
int nres = getnum;
int i = getindex;
status = lua_pcallk(L1, narg, nres, 0, i, Cfunck);
}
else if EQ("pop") {
lua_pop(L1, getnum);
}
else if EQ("printstack") {
int n = getnum;
if (n != 0) {
printf("%s\n", luaL_tolstring(L1, n, NULL));
lua_pop(L1, 1);
}
else printstack(L1);
}
else if EQ("print") {
const char *msg = getstring;
printf("%s\n", msg);
}
else if EQ("warningC") {
const char *msg = getstring;
lua_warning(L1, msg, 1);
}
else if EQ("warning") {
const char *msg = getstring;
lua_warning(L1, msg, 0);
}
else if EQ("pushbool") {
lua_pushboolean(L1, getnum);
}
else if EQ("pushcclosure") {
lua_pushcclosure(L1, testC, getnum);
}
else if EQ("pushint") {
lua_pushinteger(L1, getnum);
}
else if EQ("pushnil") {
lua_pushnil(L1);
}
else if EQ("pushnum") {
lua_pushnumber(L1, (lua_Number)getnum);
}
else if EQ("pushstatus") {
pushcode(L1, status);
}
else if EQ("pushstring") {
lua_pushstring(L1, getstring);
}
else if EQ("pushupvalueindex") {
lua_pushinteger(L1, lua_upvalueindex(getnum));
}
else if EQ("pushvalue") {
lua_pushvalue(L1, getindex);
}
else if EQ("pushfstringI") {
lua_pushfstring(L1, lua_tostring(L, -2), (int)lua_tointeger(L, -1));
}
else if EQ("pushfstringS") {
lua_pushfstring(L1, lua_tostring(L, -2), lua_tostring(L, -1));
}
else if EQ("pushfstringP") {
lua_pushfstring(L1, lua_tostring(L, -2), lua_topointer(L, -1));
}
else if EQ("rawget") {
int t = getindex;
lua_rawget(L1, t);
}
else if EQ("rawgeti") {
int t = getindex;
lua_rawgeti(L1, t, getnum);
}
else if EQ("rawgetp") {
int t = getindex;
lua_rawgetp(L1, t, cast_voidp(cast_sizet(getnum)));
}
else if EQ("rawset") {
int t = getindex;
lua_rawset(L1, t);
}
else if EQ("rawseti") {
int t = getindex;
lua_rawseti(L1, t, getnum);
}
else if EQ("rawsetp") {
int t = getindex;
lua_rawsetp(L1, t, cast_voidp(cast_sizet(getnum)));
}
else if EQ("remove") {
lua_remove(L1, getnum);
}
else if EQ("replace") {
lua_replace(L1, getindex);
}
else if EQ("resume") {
int i = getindex;
int nres;
status = lua_resume(lua_tothread(L1, i), L, getnum, &nres);
}
else if EQ("return") {
int n = getnum;
if (L1 != L) {
int i;
for (i = 0; i < n; i++) {
int idx = -(n - i);
switch (lua_type(L1, idx)) {
case LUA_TBOOLEAN:
lua_pushboolean(L, lua_toboolean(L1, idx));
break;
default:
lua_pushstring(L, lua_tostring(L1, idx));
break;
}
}
}
return n;
}
else if EQ("rotate") {
int i = getindex;
lua_rotate(L1, i, getnum);
}
else if EQ("setfield") {
int t = getindex;
const char *s = getstring;
lua_setfield(L1, t, s);
}
else if EQ("seti") {
int t = getindex;
lua_seti(L1, t, getnum);
}
else if EQ("setglobal") {
const char *s = getstring;
lua_setglobal(L1, s);
}
else if EQ("sethook") {
int mask = getnum;
int count = getnum;
const char *s = getstring;
sethookaux(L1, mask, count, s);
}
else if EQ("setmetatable") {
int idx = getindex;
lua_setmetatable(L1, idx);
}
else if EQ("settable") {
lua_settable(L1, getindex);
}
else if EQ("settop") {
lua_settop(L1, getnum);
}
else if EQ("testudata") {
int i = getindex;
lua_pushboolean(L1, luaL_testudata(L1, i, getstring) != NULL);
}
else if EQ("error") {
lua_error(L1);
}
else if EQ("abort") {
abort();
}
else if EQ("throw") {
#if defined(__cplusplus)
static struct X { int x; } x;
throw x;
#else
luaL_error(L1, "C++");
#endif
break;
}
else if EQ("tobool") {
lua_pushboolean(L1, lua_toboolean(L1, getindex));
}
else if EQ("tocfunction") {
lua_pushcfunction(L1, lua_tocfunction(L1, getindex));
}
else if EQ("tointeger") {
lua_pushinteger(L1, lua_tointeger(L1, getindex));
}
else if EQ("tonumber") {
lua_pushnumber(L1, lua_tonumber(L1, getindex));
}
else if EQ("topointer") {
lua_pushlightuserdata(L1, cast_voidp(lua_topointer(L1, getindex)));
}
else if EQ("touserdata") {
lua_pushlightuserdata(L1, lua_touserdata(L1, getindex));
}
else if EQ("tostring") {
const char *s = lua_tostring(L1, getindex);
const char *s1 = lua_pushstring(L1, s);
lua_longassert((s == NULL && s1 == NULL) || strcmp(s, s1) == 0);
}
else if EQ("type") {
lua_pushstring(L1, luaL_typename(L1, getnum));
}
else if EQ("xmove") {
int f = getindex;
int t = getindex;
lua_State *fs = (f == 0) ? L1 : lua_tothread(L1, f);
lua_State *ts = (t == 0) ? L1 : lua_tothread(L1, t);
int n = getnum;
if (n == 0) n = lua_gettop(fs);
lua_xmove(fs, ts, n);
}
else if EQ("yield") {
return lua_yield(L1, getnum);
}
else if EQ("yieldk") {
int nres = getnum;
int i = getindex;
return lua_yieldk(L1, nres, i, Cfunck);
}
else if EQ("toclose") {
lua_toclose(L1, getnum);
}
else luaL_error(L, "unknown instruction %s", buff);
}
return 0;
}
static int testC (lua_State *L) {
lua_State *L1;
const char *pc;
if (lua_isuserdata(L, 1)) {
L1 = getstate(L);
pc = luaL_checkstring(L, 2);
}
else if (lua_isthread(L, 1)) {
L1 = lua_tothread(L, 1);
pc = luaL_checkstring(L, 2);
}
else {
L1 = L;
pc = luaL_checkstring(L, 1);
}
return runC(L, L1, pc);
}
static int Cfunc (lua_State *L) {
return runC(L, L, lua_tostring(L, lua_upvalueindex(1)));
}
static int Cfunck (lua_State *L, int status, lua_KContext ctx) {
pushcode(L, status);
lua_setglobal(L, "status");
lua_pushinteger(L, ctx);
lua_setglobal(L, "ctx");
return runC(L, L, lua_tostring(L, ctx));
}
static int makeCfunc (lua_State *L) {
luaL_checkstring(L, 1);
lua_pushcclosure(L, Cfunc, lua_gettop(L));
return 1;
}
/* }====================================================== */
/*
** {======================================================
** tests for C hooks
** =======================================================
*/
/*
** C hook that runs the C script stored in registry.C_HOOK[L]
*/
static void Chook (lua_State *L, lua_Debug *ar) {
const char *scpt;
const char *const events [] = {"call", "ret", "line", "count", "tailcall"};
lua_getfield(L, LUA_REGISTRYINDEX, "C_HOOK");
lua_pushlightuserdata(L, L);
lua_gettable(L, -2); /* get C_HOOK[L] (script saved by sethookaux) */
scpt = lua_tostring(L, -1); /* not very religious (string will be popped) */
lua_pop(L, 2); /* remove C_HOOK and script */
lua_pushstring(L, events[ar->event]); /* may be used by script */
lua_pushinteger(L, ar->currentline); /* may be used by script */
runC(L, L, scpt); /* run script from C_HOOK[L] */
}
/*
** sets 'registry.C_HOOK[L] = scpt' and sets 'Chook' as a hook
*/
static void sethookaux (lua_State *L, int mask, int count, const char *scpt) {
if (*scpt == '\0') { /* no script? */
lua_sethook(L, NULL, 0, 0); /* turn off hooks */
return;
}
lua_getfield(L, LUA_REGISTRYINDEX, "C_HOOK"); /* get C_HOOK table */
if (!lua_istable(L, -1)) { /* no hook table? */
lua_pop(L, 1); /* remove previous value */
lua_newtable(L); /* create new C_HOOK table */
lua_pushvalue(L, -1);
lua_setfield(L, LUA_REGISTRYINDEX, "C_HOOK"); /* register it */
}
lua_pushlightuserdata(L, L);
lua_pushstring(L, scpt);
lua_settable(L, -3); /* C_HOOK[L] = script */
lua_sethook(L, Chook, mask, count);
}
static int sethook (lua_State *L) {
if (lua_isnoneornil(L, 1))
lua_sethook(L, NULL, 0, 0); /* turn off hooks */
else {
const char *scpt = luaL_checkstring(L, 1);
const char *smask = luaL_checkstring(L, 2);
int count = cast_int(luaL_optinteger(L, 3, 0));
int mask = 0;
if (strchr(smask, 'c')) mask |= LUA_MASKCALL;
if (strchr(smask, 'r')) mask |= LUA_MASKRET;
if (strchr(smask, 'l')) mask |= LUA_MASKLINE;
if (count > 0) mask |= LUA_MASKCOUNT;
sethookaux(L, mask, count, scpt);
}
return 0;
}
static int coresume (lua_State *L) {
int status, nres;
lua_State *co = lua_tothread(L, 1);
luaL_argcheck(L, co, 1, "coroutine expected");
status = lua_resume(co, L, 0, &nres);
if (status != LUA_OK && status != LUA_YIELD) {
lua_pushboolean(L, 0);
lua_insert(L, -2);
return 2; /* return false + error message */
}
else {
lua_pushboolean(L, 1);
return 1;
}
}
/* }====================================================== */
static const struct luaL_Reg tests_funcs[] = {
{"checkmemory", lua_checkmemory},
{"closestate", closestate},
{"d2s", d2s},
{"doonnewstack", doonnewstack},
{"doremote", doremote},
{"gccolor", gc_color},
{"gcage", gc_age},
{"gcstate", gc_state},
{"pobj", gc_printobj},
{"getref", getref},
{"hash", hash_query},
{"log2", log2_aux},
{"limits", get_limits},
{"listcode", listcode},
{"printcode", printcode},
{"listk", listk},
{"listabslineinfo", listabslineinfo},
{"listlocals", listlocals},
{"loadlib", loadlib},
{"checkpanic", checkpanic},
{"newstate", newstate},
{"newuserdata", newuserdata},
{"num2int", num2int},
{"pushuserdata", pushuserdata},
{"querystr", string_query},
{"querytab", table_query},
{"ref", tref},
{"resume", coresume},
{"s2d", s2d},
{"sethook", sethook},
{"stacklevel", stacklevel},
{"testC", testC},
{"makeCfunc", makeCfunc},
{"totalmem", mem_query},
{"alloccount", alloc_count},
{"trick", settrick},
{"udataval", udataval},
{"unref", unref},
{"upvalue", upvalue},
{NULL, NULL}
};
static void checkfinalmem (void) {
lua_assert(l_memcontrol.numblocks == 0);
lua_assert(l_memcontrol.total == 0);
}
int luaB_opentests (lua_State *L) {
void *ud;
lua_atpanic(L, &tpanic);
lua_setwarnf(L, &warnf, L);
atexit(checkfinalmem);
lua_assert(lua_getallocf(L, &ud) == debug_realloc);
lua_assert(ud == cast_voidp(&l_memcontrol));
lua_setallocf(L, lua_getallocf(L, NULL), ud);
luaL_newlib(L, tests_funcs);
return 1;
}
#endif
/*
** $Id: ltests.h $
** Internal Header for Debugging of the Lua Implementation
** See Copyright Notice in lua.h
*/
#ifndef ltests_h
#define ltests_h
#include <stdio.h>
#include <stdlib.h>
/* test Lua with compatibility code */
#define LUA_COMPAT_MATHLIB
#define LUA_COMPAT_LT_LE
#define LUA_DEBUG
/* turn on assertions */
#undef NDEBUG
#include <assert.h>
#define lua_assert(c) assert(c)
/* compiled with -O0, Lua uses a lot of C stack space... */
#undef LUAI_MAXCSTACK
#define LUAI_MAXCSTACK 400
/* to avoid warnings, and to make sure value is really unused */
#define UNUSED(x) (x=0, (void)(x))
/* test for sizes in 'l_sprintf' (make sure whole buffer is available) */
#undef l_sprintf
#if !defined(LUA_USE_C89)
#define l_sprintf(s,sz,f,i) (memset(s,0xAB,sz), snprintf(s,sz,f,i))
#else
#define l_sprintf(s,sz,f,i) (memset(s,0xAB,sz), sprintf(s,f,i))
#endif
/* get a chance to test code without jump tables */
#define LUA_USE_JUMPTABLE 0
/* use 32-bit integers in random generator */
#define LUA_RAND32
/* memory-allocator control variables */
typedef struct Memcontrol {
unsigned long numblocks;
unsigned long total;
unsigned long maxmem;
unsigned long memlimit;
unsigned long countlimit;
unsigned long objcount[LUA_NUMTYPES];
} Memcontrol;
LUA_API Memcontrol l_memcontrol;
/*
** generic variable for debug tricks
*/
extern void *l_Trick;
/*
** Function to traverse and check all memory used by Lua
*/
int lua_checkmemory (lua_State *L);
/* test for lock/unlock */
struct L_EXTRA { int lock; int *plock; };
#undef LUA_EXTRASPACE
#define LUA_EXTRASPACE sizeof(struct L_EXTRA)
#define getlock(l) cast(struct L_EXTRA*, lua_getextraspace(l))
#define luai_userstateopen(l) \
(getlock(l)->lock = 0, getlock(l)->plock = &(getlock(l)->lock))
#define luai_userstateclose(l) \
lua_assert(getlock(l)->lock == 1 && getlock(l)->plock == &(getlock(l)->lock))
#define luai_userstatethread(l,l1) \
lua_assert(getlock(l1)->plock == getlock(l)->plock)
#define luai_userstatefree(l,l1) \
lua_assert(getlock(l)->plock == getlock(l1)->plock)
#define lua_lock(l) lua_assert((*getlock(l)->plock)++ == 0)
#define lua_unlock(l) lua_assert(--(*getlock(l)->plock) == 0)
LUA_API int luaB_opentests (lua_State *L);
LUA_API void *debug_realloc (void *ud, void *block,
size_t osize, size_t nsize);
#if defined(lua_c)
#define luaL_newstate() lua_newstate(debug_realloc, &l_memcontrol)
#define luaL_openlibs(L) \
{ (luaL_openlibs)(L); \
luaL_requiref(L, "T", luaB_opentests, 1); \
lua_pop(L, 1); }
#endif
/* change some sizes to give some bugs a chance */
#undef LUAL_BUFFERSIZE
#define LUAL_BUFFERSIZE 23
#define MINSTRTABSIZE 2
#define MAXIWTHABS 3
#define STRCACHE_N 23
#define STRCACHE_M 5
#undef LUAI_USER_ALIGNMENT_T
#define LUAI_USER_ALIGNMENT_T union { char b[sizeof(void*) * 8]; }
/* make stack-overflow tests run faster */
#undef LUAI_MAXSTACK
#define LUAI_MAXSTACK 50000
/* force Lua to use its own implementations */
#undef lua_strx2number
#undef lua_number2strx
#endif
ALL¶
#!../lua
-- $Id: testes/all.lua $
-- See Copyright Notice at the end of this file
local version = "Lua 5.4"
if _VERSION ~= version then
io.stderr:write("This test suite is for ", version,
", not for ", _VERSION, "\nExiting tests")
return
end
_G.ARG = arg -- save arg for other tests
-- next variables control the execution of some tests
-- true means no test (so an undefined variable does not skip a test)
-- defaults are for Linux; test everything.
-- Make true to avoid long or memory consuming tests
_soft = rawget(_G, "_soft") or false
-- Make true to avoid non-portable tests
_port = rawget(_G, "_port") or false
-- Make true to avoid messages about tests not performed
_nomsg = rawget(_G, "_nomsg") or false
local usertests = rawget(_G, "_U")
if usertests then
-- tests for sissies ;) Avoid problems
_soft = true
_port = true
_nomsg = true
end
-- tests should require debug when needed
debug = nil
if usertests then
T = nil -- no "internal" tests for user tests
else
T = rawget(_G, "T") -- avoid problems with 'strict' module
end
--[=[
example of a long [comment],
[[spanning several [lines]]]
]=]
print("\n\tStarting Tests")
do
-- set random seed
local random_x, random_y = math.randomseed()
print(string.format("random seeds: %d, %d", random_x, random_y))
end
print("current path:\n****" .. package.path .. "****\n")
local initclock = os.clock()
local lastclock = initclock
local walltime = os.time()
local collectgarbage = collectgarbage
do -- (
-- track messages for tests not performed
local msgs = {}
function Message (m)
if not _nomsg then
print(m)
msgs[#msgs+1] = string.sub(m, 3, -3)
end
end
assert(os.setlocale"C")
local T,print,format,write,assert,type,unpack,floor =
T,print,string.format,io.write,assert,type,table.unpack,math.floor
-- use K for 1000 and M for 1000000 (not 2^10 -- 2^20)
local function F (m)
local function round (m)
m = m + 0.04999
return format("%.1f", m) -- keep one decimal digit
end
if m < 1000 then return m
else
m = m / 1000
if m < 1000 then return round(m).."K"
else
return round(m/1000).."M"
end
end
end
local Cstacklevel
local showmem
if not T then
local max = 0
showmem = function ()
local m = collectgarbage("count") * 1024
max = (m > max) and m or max
print(format(" ---- total memory: %s, max memory: %s ----\n",
F(m), F(max)))
end
Cstacklevel = function () return 0 end -- no info about stack level
else
showmem = function ()
T.checkmemory()
local total, numblocks, maxmem = T.totalmem()
local count = collectgarbage("count")
print(format(
"\n ---- total memory: %s (%.0fK), max use: %s, blocks: %d\n",
F(total), count, F(maxmem), numblocks))
print(format("\t(strings: %d, tables: %d, functions: %d, "..
"\n\tudata: %d, threads: %d)",
T.totalmem"string", T.totalmem"table", T.totalmem"function",
T.totalmem"userdata", T.totalmem"thread"))
end
Cstacklevel = function ()
local _, _, ncalls, nci = T.stacklevel()
return ncalls + nci -- number of free slots in the C stack
end
end
local Cstack = Cstacklevel()
--
-- redefine dofile to run files through dump/undump
--
local function report (n) print("\n***** FILE '"..n.."'*****") end
local olddofile = dofile
local dofile = function (n, strip)
showmem()
local c = os.clock()
print(string.format("time: %g (+%g)", c - initclock, c - lastclock))
lastclock = c
report(n)
local f = assert(loadfile(n))
local b = string.dump(f, strip)
f = assert(load(b))
return f()
end
dofile('main.lua')
do
local next, setmetatable, stderr = next, setmetatable, io.stderr
-- track collections
local mt = {}
-- each time a table is collected, remark it for finalization
-- on next cycle
mt.__gc = function (o)
stderr:write'.' -- mark progress
local n = setmetatable(o, mt) -- remark it
end
local n = setmetatable({}, mt) -- create object
end
report"gc.lua"
local f = assert(loadfile('gc.lua'))
f()
dofile('db.lua')
assert(dofile('calls.lua') == deep and deep)
olddofile('strings.lua')
olddofile('literals.lua')
dofile('tpack.lua')
assert(dofile('attrib.lua') == 27)
dofile('gengc.lua')
assert(dofile('locals.lua') == 5)
dofile('constructs.lua')
dofile('code.lua', true)
if not _G._soft then
report('big.lua')
local f = coroutine.wrap(assert(loadfile('big.lua')))
assert(f() == 'b')
assert(f() == 'a')
end
dofile('cstack.lua')
dofile('nextvar.lua')
dofile('pm.lua')
dofile('utf8.lua')
dofile('api.lua')
assert(dofile('events.lua') == 12)
dofile('vararg.lua')
dofile('closure.lua')
dofile('coroutine.lua')
dofile('goto.lua', true)
dofile('errors.lua')
dofile('math.lua')
dofile('sort.lua', true)
dofile('bitwise.lua')
assert(dofile('verybig.lua', true) == 10); collectgarbage()
dofile('files.lua')
if #msgs > 0 then
local m = table.concat(msgs, "\n ")
warn("#tests not performed:\n ", m, "\n")
end
print("(there should be two warnings now)")
warn("@on")
warn("#This is ", "an expected", " warning")
warn("@off")
warn("******** THIS WARNING SHOULD NOT APPEAR **********")
warn("******** THIS WARNING ALSO SHOULD NOT APPEAR **********")
warn("@on")
warn("#This is", " another one")
-- no test module should define 'debug'
assert(debug == nil)
local debug = require "debug"
print(string.format("%d-bit integers, %d-bit floats",
string.packsize("j") * 8, string.packsize("n") * 8))
debug.sethook(function (a) assert(type(a) == 'string') end, "cr")
-- to survive outside block
_G.showmem = showmem
assert(Cstack == Cstacklevel(),
"should be at the same C-stack level it was when started the tests")
end --)
local _G, showmem, print, format, clock, time, difftime,
assert, open, warn =
_G, showmem, print, string.format, os.clock, os.time, os.difftime,
assert, io.open, warn
-- file with time of last performed test
local fname = T and "time-debug.txt" or "time.txt"
local lasttime
if not usertests then
-- open file with time of last performed test
local f = io.open(fname)
if f then
lasttime = assert(tonumber(f:read'a'))
f:close();
else -- no such file; assume it is recording time for first time
lasttime = nil
end
end
-- erase (almost) all globals
print('cleaning all!!!!')
for n in pairs(_G) do
if not ({___Glob = 1, tostring = 1})[n] then
_G[n] = undef
end
end
collectgarbage()
collectgarbage()
collectgarbage()
collectgarbage()
collectgarbage()
collectgarbage();showmem()
local clocktime = clock() - initclock
walltime = difftime(time(), walltime)
print(format("\n\ntotal time: %.2fs (wall time: %gs)\n", clocktime, walltime))
if not usertests then
lasttime = lasttime or clocktime -- if no last time, ignore difference
-- check whether current test time differs more than 5% from last time
local diff = (clocktime - lasttime) / lasttime
local tolerance = 0.05 -- 5%
if (diff >= tolerance or diff <= -tolerance) then
warn(format("#time difference from previous test: %+.1f%%",
diff * 100))
end
assert(open(fname, "w")):write(clocktime):close()
end
print("final OK !!!")
--[[
*****************************************************************************
* Copyright (C) 1994-2016 Lua.org, PUC-Rio.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*****************************************************************************
]]
API¶
-- $Id: testes/api.lua $
-- See Copyright Notice in file all.lua
if T==nil then
(Message or print)('\n >>> testC not active: skipping API tests <<<\n')
return
end
local debug = require "debug"
local pack = table.pack
function tcheck (t1, t2)
assert(t1.n == (t2.n or #t2) + 1)
for i = 2, t1.n do assert(t1[i] == t2[i - 1]) end
end
local function checkerr (msg, f, ...)
local stat, err = pcall(f, ...)
assert(not stat and string.find(err, msg))
end
print('testing C API')
a = T.testC("pushvalue R; return 1")
assert(a == debug.getregistry())
-- absindex
assert(T.testC("settop 10; absindex -1; return 1") == 10)
assert(T.testC("settop 5; absindex -5; return 1") == 1)
assert(T.testC("settop 10; absindex 1; return 1") == 1)
assert(T.testC("settop 10; absindex R; return 1") < -10)
-- testing alignment
a = T.d2s(12458954321123.0)
assert(a == string.pack("d", 12458954321123.0))
assert(T.s2d(a) == 12458954321123.0)
a,b,c = T.testC("pushnum 1; pushnum 2; pushnum 3; return 2")
assert(a == 2 and b == 3 and not c)
f = T.makeCfunc("pushnum 1; pushnum 2; pushnum 3; return 2")
a,b,c = f()
assert(a == 2 and b == 3 and not c)
-- test that all trues are equal
a,b,c = T.testC("pushbool 1; pushbool 2; pushbool 0; return 3")
assert(a == b and a == true and c == false)
a,b,c = T.testC"pushbool 0; pushbool 10; pushnil;\
tobool -3; tobool -3; tobool -3; return 3"
assert(a==false and b==true and c==false)
a,b,c = T.testC("gettop; return 2", 10, 20, 30, 40)
assert(a == 40 and b == 5 and not c)
t = pack(T.testC("settop 5; return *", 2, 3))
tcheck(t, {n=4,2,3})
t = pack(T.testC("settop 0; settop 15; return 10", 3, 1, 23))
assert(t.n == 10 and t[1] == nil and t[10] == nil)
t = pack(T.testC("remove -2; return *", 2, 3, 4))
tcheck(t, {n=2,2,4})
t = pack(T.testC("insert -1; return *", 2, 3))
tcheck(t, {n=2,2,3})
t = pack(T.testC("insert 3; return *", 2, 3, 4, 5))
tcheck(t, {n=4,2,5,3,4})
t = pack(T.testC("replace 2; return *", 2, 3, 4, 5))
tcheck(t, {n=3,5,3,4})
t = pack(T.testC("replace -2; return *", 2, 3, 4, 5))
tcheck(t, {n=3,2,3,5})
t = pack(T.testC("remove 3; return *", 2, 3, 4, 5))
tcheck(t, {n=3,2,4,5})
t = pack(T.testC("copy 3 4; return *", 2, 3, 4, 5))
tcheck(t, {n=4,2,3,3,5})
t = pack(T.testC("copy -3 -1; return *", 2, 3, 4, 5))
tcheck(t, {n=4,2,3,4,3})
do -- testing 'rotate'
local t = {10, 20, 30, 40, 50, 60}
for i = -6, 6 do
local s = string.format("rotate 2 %d; return 7", i)
local t1 = pack(T.testC(s, 10, 20, 30, 40, 50, 60))
tcheck(t1, t)
table.insert(t, 1, table.remove(t))
end
t = pack(T.testC("rotate -2 1; return *", 10, 20, 30, 40))
tcheck(t, {10, 20, 40, 30})
t = pack(T.testC("rotate -2 -1; return *", 10, 20, 30, 40))
tcheck(t, {10, 20, 40, 30})
-- some corner cases
t = pack(T.testC("rotate -1 0; return *", 10, 20, 30, 40))
tcheck(t, {10, 20, 30, 40})
t = pack(T.testC("rotate -1 1; return *", 10, 20, 30, 40))
tcheck(t, {10, 20, 30, 40})
t = pack(T.testC("rotate 5 -1; return *", 10, 20, 30, 40))
tcheck(t, {10, 20, 30, 40})
end
-- testing warnings
T.testC([[
warningC "#This shold be a"
warningC " single "
warning "warning"
warningC "#This should be "
warning "another one"
]])
-- testing message handlers
do
local f = T.makeCfunc[[
getglobal error
pushstring bola
pcall 1 1 1 # call 'error' with given handler
pushstatus
return 2 # return error message and status
]]
local msg, st = f(string.upper) -- function handler
assert(st == "ERRRUN" and msg == "BOLA")
local msg, st = f(string.len) -- function handler
assert(st == "ERRRUN" and msg == 4)
end
t = pack(T.testC("insert 3; pushvalue 3; remove 3; pushvalue 2; remove 2; \
insert 2; pushvalue 1; remove 1; insert 1; \
insert -2; pushvalue -2; remove -3; return *",
2, 3, 4, 5, 10, 40, 90))
tcheck(t, {n=7,2,3,4,5,10,40,90})
t = pack(T.testC("concat 5; return *", "alo", 2, 3, "joao", 12))
tcheck(t, {n=1,"alo23joao12"})
-- testing MULTRET
t = pack(T.testC("call 2,-1; return *",
function (a,b) return 1,2,3,4,a,b end, "alo", "joao"))
tcheck(t, {n=6,1,2,3,4,"alo", "joao"})
do -- test returning more results than fit in the caller stack
local a = {}
for i=1,1000 do a[i] = true end; a[999] = 10
local b = T.testC([[pcall 1 -1 0; pop 1; tostring -1; return 1]],
table.unpack, a)
assert(b == "10")
end
-- testing globals
_G.a = 14; _G.b = "a31"
local a = {T.testC[[
getglobal a;
getglobal b;
getglobal b;
setglobal a;
return *
]]}
assert(a[2] == 14 and a[3] == "a31" and a[4] == nil and _G.a == "a31")
-- testing arith
assert(T.testC("pushnum 10; pushnum 20; arith /; return 1") == 0.5)
assert(T.testC("pushnum 10; pushnum 20; arith -; return 1") == -10)
assert(T.testC("pushnum 10; pushnum -20; arith *; return 1") == -200)
assert(T.testC("pushnum 10; pushnum 3; arith ^; return 1") == 1000)
assert(T.testC("pushnum 10; pushstring 20; arith /; return 1") == 0.5)
assert(T.testC("pushstring 10; pushnum 20; arith -; return 1") == -10)
assert(T.testC("pushstring 10; pushstring -20; arith *; return 1") == -200)
assert(T.testC("pushstring 10; pushstring 3; arith ^; return 1") == 1000)
assert(T.testC("arith /; return 1", 2, 0) == 10.0/0)
a = T.testC("pushnum 10; pushint 3; arith \\; return 1")
assert(a == 3.0 and math.type(a) == "float")
a = T.testC("pushint 10; pushint 3; arith \\; return 1")
assert(a == 3 and math.type(a) == "integer")
a = assert(T.testC("pushint 10; pushint 3; arith +; return 1"))
assert(a == 13 and math.type(a) == "integer")
a = assert(T.testC("pushnum 10; pushint 3; arith +; return 1"))
assert(a == 13 and math.type(a) == "float")
a,b,c = T.testC([[pushnum 1;
pushstring 10; arith _;
pushstring 5; return 3]])
assert(a == 1 and b == -10 and c == "5")
mt = {__add = function (a,b) return setmetatable({a[1] + b[1]}, mt) end,
__mod = function (a,b) return setmetatable({a[1] % b[1]}, mt) end,
__unm = function (a) return setmetatable({a[1]* 2}, mt) end}
a,b,c = setmetatable({4}, mt),
setmetatable({8}, mt),
setmetatable({-3}, mt)
x,y,z = T.testC("arith +; return 2", 10, a, b)
assert(x == 10 and y[1] == 12 and z == nil)
assert(T.testC("arith %; return 1", a, c)[1] == 4%-3)
assert(T.testC("arith _; arith +; arith %; return 1", b, a, c)[1] ==
8 % (4 + (-3)*2))
-- errors in arithmetic
checkerr("divide by zero", T.testC, "arith \\", 10, 0)
checkerr("%%0", T.testC, "arith %", 10, 0)
-- testing lessthan and lessequal
assert(T.testC("compare LT 2 5, return 1", 3, 2, 2, 4, 2, 2))
assert(T.testC("compare LE 2 5, return 1", 3, 2, 2, 4, 2, 2))
assert(not T.testC("compare LT 3 4, return 1", 3, 2, 2, 4, 2, 2))
assert(T.testC("compare LE 3 4, return 1", 3, 2, 2, 4, 2, 2))
assert(T.testC("compare LT 5 2, return 1", 4, 2, 2, 3, 2, 2))
assert(not T.testC("compare LT 2 -3, return 1", "4", "2", "2", "3", "2", "2"))
assert(not T.testC("compare LT -3 2, return 1", "3", "2", "2", "4", "2", "2"))
-- non-valid indices produce false
assert(not T.testC("compare LT 1 4, return 1"))
assert(not T.testC("compare LE 9 1, return 1"))
assert(not T.testC("compare EQ 9 9, return 1"))
local b = {__lt = function (a,b) return a[1] < b[1] end}
local a1,a3,a4 = setmetatable({1}, b),
setmetatable({3}, b),
setmetatable({4}, b)
assert(T.testC("compare LT 2 5, return 1", a3, 2, 2, a4, 2, 2))
assert(T.testC("compare LE 2 5, return 1", a3, 2, 2, a4, 2, 2))
assert(T.testC("compare LT 5 -6, return 1", a4, 2, 2, a3, 2, 2))
a,b = T.testC("compare LT 5 -6, return 2", a1, 2, 2, a3, 2, 20)
assert(a == 20 and b == false)
a,b = T.testC("compare LE 5 -6, return 2", a1, 2, 2, a3, 2, 20)
assert(a == 20 and b == false)
a,b = T.testC("compare LE 5 -6, return 2", a1, 2, 2, a1, 2, 20)
assert(a == 20 and b == true)
do -- testing lessthan and lessequal with metamethods
local mt = {__lt = function (a,b) return a[1] < b[1] end,
__le = function (a,b) return a[1] <= b[1] end,
__eq = function (a,b) return a[1] == b[1] end}
local function O (x)
return setmetatable({x}, mt)
end
local a, b = T.testC("compare LT 2 3; pushint 10; return 2", O(1), O(2))
assert(a == true and b == 10)
local a, b = T.testC("compare LE 2 3; pushint 10; return 2", O(3), O(2))
assert(a == false and b == 10)
local a, b = T.testC("compare EQ 2 3; pushint 10; return 2", O(3), O(3))
assert(a == true and b == 10)
end
-- testing length
local t = setmetatable({x = 20}, {__len = function (t) return t.x end})
a,b,c = T.testC([[
len 2;
Llen 2;
objsize 2;
return 3
]], t)
assert(a == 20 and b == 20 and c == 0)
t.x = "234"; t[1] = 20
a,b,c = T.testC([[
len 2;
Llen 2;
objsize 2;
return 3
]], t)
assert(a == "234" and b == 234 and c == 1)
t.x = print; t[1] = 20
a,c = T.testC([[
len 2;
objsize 2;
return 2
]], t)
assert(a == print and c == 1)
-- testing __concat
a = setmetatable({x="u"}, {__concat = function (a,b) return a.x..'.'..b.x end})
x,y = T.testC([[
pushnum 5
pushvalue 2;
pushvalue 2;
concat 2;
pushvalue -2;
return 2;
]], a, a)
assert(x == a..a and y == 5)
-- concat with 0 elements
assert(T.testC("concat 0; return 1") == "")
-- concat with 1 element
assert(T.testC("concat 1; return 1", "xuxu") == "xuxu")
-- testing lua_is
function B(x) return x and 1 or 0 end
function count (x, n)
n = n or 2
local prog = [[
isnumber %d;
isstring %d;
isfunction %d;
iscfunction %d;
istable %d;
isuserdata %d;
isnil %d;
isnull %d;
return 8
]]
prog = string.format(prog, n, n, n, n, n, n, n, n)
local a,b,c,d,e,f,g,h = T.testC(prog, x)
return B(a)+B(b)+B(c)+B(d)+B(e)+B(f)+B(g)+(100*B(h))
end
assert(count(3) == 2)
assert(count('alo') == 1)
assert(count('32') == 2)
assert(count({}) == 1)
assert(count(print) == 2)
assert(count(function () end) == 1)
assert(count(nil) == 1)
assert(count(io.stdin) == 1)
assert(count(nil, 15) == 100)
-- testing lua_to...
function to (s, x, n)
n = n or 2
return T.testC(string.format("%s %d; return 1", s, n), x)
end
local null = T.pushuserdata(0)
local hfunc = string.gmatch("", "") -- a "heavy C function" (with upvalues)
assert(debug.getupvalue(hfunc, 1))
assert(to("tostring", {}) == nil)
assert(to("tostring", "alo") == "alo")
assert(to("tostring", 12) == "12")
assert(to("tostring", 12, 3) == nil)
assert(to("objsize", {}) == 0)
assert(to("objsize", {1,2,3}) == 3)
assert(to("objsize", "alo\0\0a") == 6)
assert(to("objsize", T.newuserdata(0)) == 0)
assert(to("objsize", T.newuserdata(101)) == 101)
assert(to("objsize", 124) == 0)
assert(to("objsize", true) == 0)
assert(to("tonumber", {}) == 0)
assert(to("tonumber", "12") == 12)
assert(to("tonumber", "s2") == 0)
assert(to("tonumber", 1, 20) == 0)
assert(to("topointer", 10) == null)
assert(to("topointer", true) == null)
assert(to("topointer", nil) == null)
assert(to("topointer", "abc") ~= null)
assert(to("topointer", string.rep("x", 10)) ==
to("topointer", string.rep("x", 10))) -- short strings
do -- long strings
local s1 = string.rep("x", 300)
local s2 = string.rep("x", 300)
assert(to("topointer", s1) ~= to("topointer", s2))
end
assert(to("topointer", T.pushuserdata(20)) ~= null)
assert(to("topointer", io.read) ~= null) -- light C function
assert(to("topointer", hfunc) ~= null) -- "heavy" C function
assert(to("topointer", function () end) ~= null) -- Lua function
assert(to("topointer", io.stdin) ~= null) -- full userdata
assert(to("func2num", 20) == 0)
assert(to("func2num", T.pushuserdata(10)) == 0)
assert(to("func2num", io.read) ~= 0) -- light C function
assert(to("func2num", hfunc) ~= 0) -- "heavy" C function (with upvalue)
a = to("tocfunction", math.deg)
assert(a(3) == math.deg(3) and a == math.deg)
print("testing panic function")
do
-- trivial error
assert(T.checkpanic("pushstring hi; error") == "hi")
-- using the stack inside panic
assert(T.checkpanic("pushstring hi; error;",
[[checkstack 5 XX
pushstring ' alo'
pushstring ' mundo'
concat 3]]) == "hi alo mundo")
-- "argerror" without frames
assert(T.checkpanic("loadstring 4") ==
"bad argument #4 (string expected, got no value)")
-- memory error
T.totalmem(T.totalmem()+10000) -- set low memory limit (+10k)
assert(T.checkpanic("newuserdata 20000") == "not enough memory")
T.totalmem(0) -- restore high limit
-- stack error
if not _soft then
local msg = T.checkpanic[[
pushstring "function f() f() end"
loadstring -1; call 0 0
getglobal f; call 0 0
]]
assert(string.find(msg, "stack overflow"))
end
-- exit in panic still close to-be-closed variables
assert(T.checkpanic([[
pushstring "return {__close = function () Y = 'ho'; end}"
newtable
loadstring -2
call 0 1
setmetatable -2
toclose -1
pushstring "hi"
error
]],
[[
getglobal Y
concat 2 # concat original error with global Y
]]) == "hiho")
end
-- testing deep C stack
if not _soft then
print("testing stack overflow")
collectgarbage("stop")
checkerr("XXXX", T.testC, "checkstack 1000023 XXXX") -- too deep
-- too deep (with no message)
checkerr("^stack overflow$", T.testC, "checkstack 1000023 ''")
local s = string.rep("pushnil;checkstack 1 XX;", 1000000)
checkerr("overflow", T.testC, s)
collectgarbage("restart")
print'+'
end
local lim = _soft and 500 or 12000
local prog = {"checkstack " .. (lim * 2 + 100) .. "msg", "newtable"}
for i = 1,lim do
prog[#prog + 1] = "pushnum " .. i
prog[#prog + 1] = "pushnum " .. i * 10
end
prog[#prog + 1] = "rawgeti R 2" -- get global table in registry
prog[#prog + 1] = "insert " .. -(2*lim + 2)
for i = 1,lim do
prog[#prog + 1] = "settable " .. -(2*(lim - i + 1) + 1)
end
prog[#prog + 1] = "return 2"
prog = table.concat(prog, ";")
local g, t = T.testC(prog)
assert(g == _G)
for i = 1,lim do assert(t[i] == i*10); t[i] = undef end
assert(next(t) == nil)
prog, g, t = nil
-- testing errors
a = T.testC([[
loadstring 2; pcall 0 1 0;
pushvalue 3; insert -2; pcall 1 1 0;
pcall 0 0 0;
return 1
]], "x=150", function (a) assert(a==nil); return 3 end)
assert(type(a) == 'string' and x == 150)
function check3(p, ...)
local arg = {...}
assert(#arg == 3)
assert(string.find(arg[3], p))
end
check3(":1:", T.testC("loadstring 2; return *", "x="))
check3("%.", T.testC("loadfile 2; return *", "."))
check3("xxxx", T.testC("loadfile 2; return *", "xxxx"))
-- test errors in non protected threads
function checkerrnopro (code, msg)
local th = coroutine.create(function () end) -- create new thread
local stt, err = pcall(T.testC, th, code) -- run code there
assert(not stt and string.find(err, msg))
end
if not _soft then
checkerrnopro("pushnum 3; call 0 0", "attempt to call")
print"testing stack overflow in unprotected thread"
function f () f() end
checkerrnopro("getglobal 'f'; call 0 0;", "stack overflow")
end
print"+"
-- testing table access
do -- getp/setp
local a = {}
local a1 = T.testC("rawsetp 2 1; return 1", a, 20)
assert(a == a1)
assert(a[T.pushuserdata(1)] == 20)
local a1, res = T.testC("rawgetp -1 1; return 2", a)
assert(a == a1 and res == 20)
end
do -- using the table itself as index
local a = {}
a[a] = 10
local prog = "gettable -1; return *"
local res = {T.testC(prog, a)}
assert(#res == 2 and res[1] == prog and res[2] == 10)
local prog = "settable -2; return *"
local res = {T.testC(prog, a, 20)}
assert(a[a] == 20)
assert(#res == 1 and res[1] == prog)
-- raw
a[a] = 10
local prog = "rawget -1; return *"
local res = {T.testC(prog, a)}
assert(#res == 2 and res[1] == prog and res[2] == 10)
local prog = "rawset -2; return *"
local res = {T.testC(prog, a, 20)}
assert(a[a] == 20)
assert(#res == 1 and res[1] == prog)
-- using the table as the value to set
local prog = "rawset -1; return *"
local res = {T.testC(prog, 30, a)}
assert(a[30] == a)
assert(#res == 1 and res[1] == prog)
local prog = "settable -1; return *"
local res = {T.testC(prog, 40, a)}
assert(a[40] == a)
assert(#res == 1 and res[1] == prog)
local prog = "rawseti -1 100; return *"
local res = {T.testC(prog, a)}
assert(a[100] == a)
assert(#res == 1 and res[1] == prog)
local prog = "seti -1 200; return *"
local res = {T.testC(prog, a)}
assert(a[200] == a)
assert(#res == 1 and res[1] == prog)
end
a = {x=0, y=12}
x, y = T.testC("gettable 2; pushvalue 4; gettable 2; return 2",
a, 3, "y", 4, "x")
assert(x == 0 and y == 12)
T.testC("settable -5", a, 3, 4, "x", 15)
assert(a.x == 15)
a[a] = print
x = T.testC("gettable 2; return 1", a) -- table and key are the same object!
assert(x == print)
T.testC("settable 2", a, "x") -- table and key are the same object!
assert(a[a] == "x")
b = setmetatable({p = a}, {})
getmetatable(b).__index = function (t, i) return t.p[i] end
k, x = T.testC("gettable 3, return 2", 4, b, 20, 35, "x")
assert(x == 15 and k == 35)
k = T.testC("getfield 2 y, return 1", b)
assert(k == 12)
getmetatable(b).__index = function (t, i) return a[i] end
getmetatable(b).__newindex = function (t, i,v ) a[i] = v end
y = T.testC("insert 2; gettable -5; return 1", 2, 3, 4, "y", b)
assert(y == 12)
k = T.testC("settable -5, return 1", b, 3, 4, "x", 16)
assert(a.x == 16 and k == 4)
a[b] = 'xuxu'
y = T.testC("gettable 2, return 1", b)
assert(y == 'xuxu')
T.testC("settable 2", b, 19)
assert(a[b] == 19)
--
do -- testing getfield/setfield with long keys
local t = {_012345678901234567890123456789012345678901234567890123456789 = 32}
local a = T.testC([[
getfield 2 _012345678901234567890123456789012345678901234567890123456789
return 1
]], t)
assert(a == 32)
local a = T.testC([[
pushnum 33
setglobal _012345678901234567890123456789012345678901234567890123456789
]])
assert(_012345678901234567890123456789012345678901234567890123456789 == 33)
_012345678901234567890123456789012345678901234567890123456789 = nil
end
-- testing next
a = {}
t = pack(T.testC("next; return *", a, nil))
tcheck(t, {n=1,a})
a = {a=3}
t = pack(T.testC("next; return *", a, nil))
tcheck(t, {n=3,a,'a',3})
t = pack(T.testC("next; pop 1; next; return *", a, nil))
tcheck(t, {n=1,a})
-- testing upvalues
do
local A = T.testC[[ pushnum 10; pushnum 20; pushcclosure 2; return 1]]
t, b, c = A([[pushvalue U0; pushvalue U1; pushvalue U2; return 3]])
assert(b == 10 and c == 20 and type(t) == 'table')
a, b = A([[tostring U3; tonumber U4; return 2]])
assert(a == nil and b == 0)
A([[pushnum 100; pushnum 200; replace U2; replace U1]])
b, c = A([[pushvalue U1; pushvalue U2; return 2]])
assert(b == 100 and c == 200)
A([[replace U2; replace U1]], {x=1}, {x=2})
b, c = A([[pushvalue U1; pushvalue U2; return 2]])
assert(b.x == 1 and c.x == 2)
T.checkmemory()
end
-- testing absent upvalues from C-function pointers
assert(T.testC[[isnull U1; return 1]] == true)
assert(T.testC[[isnull U100; return 1]] == true)
assert(T.testC[[pushvalue U1; return 1]] == nil)
local f = T.testC[[ pushnum 10; pushnum 20; pushcclosure 2; return 1]]
assert(T.upvalue(f, 1) == 10 and
T.upvalue(f, 2) == 20 and
T.upvalue(f, 3) == nil)
T.upvalue(f, 2, "xuxu")
assert(T.upvalue(f, 2) == "xuxu")
-- large closures
do
local A = "checkstack 300 msg;" ..
string.rep("pushnum 10;", 255) ..
"pushcclosure 255; return 1"
A = T.testC(A)
for i=1,255 do
assert(A(("pushvalue U%d; return 1"):format(i)) == 10)
end
assert(A("isnull U256; return 1"))
assert(not A("isnil U256; return 1"))
end
-- testing get/setuservalue
-- bug in 5.1.2
checkerr("got number", debug.setuservalue, 3, {})
checkerr("got nil", debug.setuservalue, nil, {})
checkerr("got light userdata", debug.setuservalue, T.pushuserdata(1), {})
-- testing multiple user values
local b = T.newuserdata(0, 10)
for i = 1, 10 do
local v, p = debug.getuservalue(b, i)
assert(v == nil and p)
end
do -- indices out of range
local v, p = debug.getuservalue(b, -2)
assert(v == nil and not p)
local v, p = debug.getuservalue(b, 11)
assert(v == nil and not p)
end
local t = {true, false, 4.56, print, {}, b, "XYZ"}
for k, v in ipairs(t) do
debug.setuservalue(b, v, k)
end
for k, v in ipairs(t) do
local v1, p = debug.getuservalue(b, k)
assert(v1 == v and p)
end
assert(not debug.getuservalue(4))
debug.setuservalue(b, function () return 10 end, 10)
collectgarbage() -- function should not be collected
assert(debug.getuservalue(b, 10)() == 10)
debug.setuservalue(b, 134)
collectgarbage() -- number should not be a problem for collector
assert(debug.getuservalue(b) == 134)
-- test barrier for uservalues
do
local oldmode = collectgarbage("incremental")
T.gcstate("atomic")
assert(T.gccolor(b) == "black")
debug.setuservalue(b, {x = 100})
T.gcstate("pause") -- complete collection
assert(debug.getuservalue(b).x == 100) -- uvalue should be there
collectgarbage(oldmode)
end
-- long chain of userdata
for i = 1, 1000 do
local bb = T.newuserdata(0, 1)
debug.setuservalue(bb, b)
b = bb
end
collectgarbage() -- nothing should not be collected
for i = 1, 1000 do
b = debug.getuservalue(b)
end
assert(debug.getuservalue(b).x == 100)
b = nil
-- testing locks (refs)
-- reuse of references
local i = T.ref{}
T.unref(i)
assert(T.ref{} == i)
Arr = {}
Lim = 100
for i=1,Lim do -- lock many objects
Arr[i] = T.ref({})
end
assert(T.ref(nil) == -1 and T.getref(-1) == nil)
T.unref(-1); T.unref(-1)
for i=1,Lim do -- unlock all them
T.unref(Arr[i])
end
function printlocks ()
local f = T.makeCfunc("gettable R; return 1")
local n = f("n")
print("n", n)
for i=0,n do
print(i, f(i))
end
end
for i=1,Lim do -- lock many objects
Arr[i] = T.ref({})
end
for i=1,Lim,2 do -- unlock half of them
T.unref(Arr[i])
end
assert(type(T.getref(Arr[2])) == 'table')
assert(T.getref(-1) == nil)
a = T.ref({})
collectgarbage()
assert(type(T.getref(a)) == 'table')
-- colect in cl the `val' of all collected userdata
tt = {}
cl = {n=0}
A = nil; B = nil
local F
F = function (x)
local udval = T.udataval(x)
table.insert(cl, udval)
local d = T.newuserdata(100) -- create garbage
d = nil
assert(debug.getmetatable(x).__gc == F)
assert(load("table.insert({}, {})"))() -- create more garbage
collectgarbage() -- force a GC during GC
assert(debug.getmetatable(x).__gc == F) -- previous GC did not mess this?
local dummy = {} -- create more garbage during GC
if A ~= nil then
assert(type(A) == "userdata")
assert(T.udataval(A) == B)
debug.getmetatable(A) -- just access it
end
A = x -- ressucita userdata
B = udval
return 1,2,3
end
tt.__gc = F
-- test whether udate collection frees memory in the right time
do
collectgarbage();
collectgarbage();
local x = collectgarbage("count");
local a = T.newuserdata(5001)
assert(T.testC("objsize 2; return 1", a) == 5001)
assert(collectgarbage("count") >= x+4)
a = nil
collectgarbage();
assert(collectgarbage("count") <= x+1)
-- udata without finalizer
x = collectgarbage("count")
collectgarbage("stop")
for i=1,1000 do T.newuserdata(0) end
assert(collectgarbage("count") > x+10)
collectgarbage()
assert(collectgarbage("count") <= x+1)
-- udata with finalizer
collectgarbage()
x = collectgarbage("count")
collectgarbage("stop")
a = {__gc = function () end}
for i=1,1000 do debug.setmetatable(T.newuserdata(0), a) end
assert(collectgarbage("count") >= x+10)
collectgarbage() -- this collection only calls TM, without freeing memory
assert(collectgarbage("count") >= x+10)
collectgarbage() -- now frees memory
assert(collectgarbage("count") <= x+1)
collectgarbage("restart")
end
collectgarbage("stop")
-- create 3 userdatas with tag `tt'
a = T.newuserdata(0); debug.setmetatable(a, tt); na = T.udataval(a)
b = T.newuserdata(0); debug.setmetatable(b, tt); nb = T.udataval(b)
c = T.newuserdata(0); debug.setmetatable(c, tt); nc = T.udataval(c)
-- create userdata without meta table
x = T.newuserdata(4)
y = T.newuserdata(0)
checkerr("FILE%* expected, got userdata", io.input, a)
checkerr("FILE%* expected, got userdata", io.input, x)
assert(debug.getmetatable(x) == nil and debug.getmetatable(y) == nil)
d=T.ref(a);
e=T.ref(b);
f=T.ref(c);
t = {T.getref(d), T.getref(e), T.getref(f)}
assert(t[1] == a and t[2] == b and t[3] == c)
t=nil; a=nil; c=nil;
T.unref(e); T.unref(f)
collectgarbage()
-- check that unref objects have been collected
assert(#cl == 1 and cl[1] == nc)
x = T.getref(d)
assert(type(x) == 'userdata' and debug.getmetatable(x) == tt)
x =nil
tt.b = b -- create cycle
tt=nil -- frees tt for GC
A = nil
b = nil
T.unref(d);
n5 = T.newuserdata(0)
debug.setmetatable(n5, {__gc=F})
n5 = T.udataval(n5)
collectgarbage()
assert(#cl == 4)
-- check order of collection
assert(cl[2] == n5 and cl[3] == nb and cl[4] == na)
collectgarbage"restart"
a, na = {}, {}
for i=30,1,-1 do
a[i] = T.newuserdata(0)
debug.setmetatable(a[i], {__gc=F})
na[i] = T.udataval(a[i])
end
cl = {}
a = nil; collectgarbage()
assert(#cl == 30)
for i=1,30 do assert(cl[i] == na[i]) end
na = nil
for i=2,Lim,2 do -- unlock the other half
T.unref(Arr[i])
end
x = T.newuserdata(41); debug.setmetatable(x, {__gc=F})
assert(T.testC("objsize 2; return 1", x) == 41)
cl = {}
a = {[x] = 1}
x = T.udataval(x)
collectgarbage()
-- old `x' cannot be collected (`a' still uses it)
assert(#cl == 0)
for n in pairs(a) do a[n] = undef end
collectgarbage()
assert(#cl == 1 and cl[1] == x) -- old `x' must be collected
-- testing lua_equal
assert(T.testC("compare EQ 2 4; return 1", print, 1, print, 20))
assert(T.testC("compare EQ 3 2; return 1", 'alo', "alo"))
assert(T.testC("compare EQ 2 3; return 1", nil, nil))
assert(not T.testC("compare EQ 2 3; return 1", {}, {}))
assert(not T.testC("compare EQ 2 3; return 1"))
assert(not T.testC("compare EQ 2 3; return 1", 3))
-- testing lua_equal with fallbacks
do
local map = {}
local t = {__eq = function (a,b) return map[a] == map[b] end}
local function f(x)
local u = T.newuserdata(0)
debug.setmetatable(u, t)
map[u] = x
return u
end
assert(f(10) == f(10))
assert(f(10) ~= f(11))
assert(T.testC("compare EQ 2 3; return 1", f(10), f(10)))
assert(not T.testC("compare EQ 2 3; return 1", f(10), f(20)))
t.__eq = nil
assert(f(10) ~= f(10))
end
print'+'
-- testing changing hooks during hooks
_G.t = {}
T.sethook([[
# set a line hook after 3 count hooks
sethook 4 0 '
getglobal t;
pushvalue -3; append -2
pushvalue -2; append -2
']], "c", 3)
local a = 1 -- counting
a = 1 -- counting
a = 1 -- count hook (set line hook)
a = 1 -- line hook
a = 1 -- line hook
debug.sethook()
t = _G.t
assert(t[1] == "line")
line = t[2]
assert(t[3] == "line" and t[4] == line + 1)
assert(t[5] == "line" and t[6] == line + 2)
assert(t[7] == nil)
-------------------------------------------------------------------------
do -- testing errors during GC
warn("@off")
collectgarbage("stop")
local a = {}
for i=1,20 do
a[i] = T.newuserdata(i) -- creates several udata
end
for i=1,20,2 do -- mark half of them to raise errors during GC
debug.setmetatable(a[i],
{__gc = function (x) error("@expected error in gc") end})
end
for i=2,20,2 do -- mark the other half to count and to create more garbage
debug.setmetatable(a[i], {__gc = function (x) load("A=A+1")() end})
end
a = nil
_G.A = 0
collectgarbage()
assert(A == 10) -- number of normal collections
collectgarbage("restart")
warn("@on")
end
-------------------------------------------------------------------------
-- test for userdata vals
do
local a = {}; local lim = 30
for i=0,lim do a[i] = T.pushuserdata(i) end
for i=0,lim do assert(T.udataval(a[i]) == i) end
for i=0,lim do assert(T.pushuserdata(i) == a[i]) end
for i=0,lim do a[a[i]] = i end
for i=0,lim do a[T.pushuserdata(i)] = i end
assert(type(tostring(a[1])) == "string")
end
-------------------------------------------------------------------------
-- testing multiple states
T.closestate(T.newstate());
L1 = T.newstate()
assert(L1)
assert(T.doremote(L1, "X='a'; return 'a'") == 'a')
assert(#pack(T.doremote(L1, "function f () return 'alo', 3 end; f()")) == 0)
a, b = T.doremote(L1, "return f()")
assert(a == 'alo' and b == '3')
T.doremote(L1, "_ERRORMESSAGE = nil")
-- error: `sin' is not defined
a, _, b = T.doremote(L1, "return sin(1)")
assert(a == nil and b == 2) -- 2 == run-time error
-- error: syntax error
a, b, c = T.doremote(L1, "return a+")
assert(a == nil and c == 3 and type(b) == "string") -- 3 == syntax error
T.loadlib(L1)
a, b, c = T.doremote(L1, [[
string = require'string'
a = require'_G'; assert(a == _G and require("_G") == a)
io = require'io'; assert(type(io.read) == "function")
assert(require("io") == io)
a = require'table'; assert(type(a.insert) == "function")
a = require'debug'; assert(type(a.getlocal) == "function")
a = require'math'; assert(type(a.sin) == "function")
return string.sub('okinama', 1, 2)
]])
assert(a == "ok")
T.closestate(L1);
L1 = T.newstate()
T.loadlib(L1)
T.doremote(L1, "a = {}")
T.testC(L1, [[getglobal "a"; pushstring "x"; pushint 1;
settable -3]])
assert(T.doremote(L1, "return a.x") == "1")
T.closestate(L1)
L1 = nil
print('+')
-------------------------------------------------------------------------
-- testing to-be-closed variables
-------------------------------------------------------------------------
print"testing to-be-closed variables"
do
local openresource = {}
local function newresource ()
local x = setmetatable({10}, {__close = function(y)
assert(openresource[#openresource] == y)
openresource[#openresource] = nil
y[1] = y[1] + 1
end})
openresource[#openresource + 1] = x
return x
end
local a, b = T.testC([[
call 0 1 # create resource
pushnil
toclose -2 # mark call result to be closed
toclose -1 # mark nil to be closed (will be ignored)
return 2
]], newresource)
assert(a[1] == 11 and b == nil)
assert(#openresource == 0) -- was closed
-- repeat the test, but calling function in a 'multret' context
local a = {T.testC([[
call 0 1 # create resource
toclose 2 # mark it to be closed
return 2
]], newresource)}
assert(type(a[1]) == "string" and a[2][1] == 11)
assert(#openresource == 0) -- was closed
-- closing by error
local a, b = pcall(T.makeCfunc[[
call 0 1 # create resource
toclose -1 # mark it to be closed
error # resource is the error object
]], newresource)
assert(a == false and b[1] == 11)
assert(#openresource == 0) -- was closed
-- non-closable value
local a, b = pcall(T.makeCfunc[[
newtable # create non-closable object
toclose -1 # mark it to be closed (should raise an error)
abort # will not be executed
]])
assert(a == false and
string.find(b, "non%-closable value"))
local function check (n)
assert(#openresource == n)
end
-- closing resources with 'settop'
local a = T.testC([[
pushvalue 2
call 0 1 # create resource
toclose -1 # mark it to be closed
pushvalue 2
call 0 1 # create another resource
toclose -1 # mark it to be closed
pushvalue 3
pushint 2 # there should be two open resources
call 1 0
pop 1 # pop second resource from the stack
pushvalue 3
pushint 1 # there should be one open resource
call 1 0
pop 1 # pop second resource from the stack
pushint *
return 1 # return stack size
]], newresource, check)
assert(a == 3) -- no extra items left in the stack
-- non-closable value
local a, b = pcall(T.makeCfunc[[
pushint 32
toclose -1
]])
assert(not a and string.find(b, "(C temporary)"))
end
-------------------------------------------------------------------------
-- testing memory limits
-------------------------------------------------------------------------
print("memory-allocation errors")
checkerr("block too big", T.newuserdata, math.maxinteger)
collectgarbage()
local f = load"local a={}; for i=1,100000 do a[i]=i end"
T.alloccount(10)
checkerr("not enough memory", f)
T.alloccount() -- remove limit
-- test memory errors; increase limit for number of allocations one
-- by one, so that we get memory errors in all allocations of a given
-- task, until there is enough allocations to complete the task without
-- errors.
function testamem (s, f)
collectgarbage(); collectgarbage()
local M = 0
local a,b = nil
while true do
T.alloccount(M)
a, b = pcall(f)
T.alloccount() -- remove limit
if a and b then break end -- stop when no more errors
if not a and not -- `real' error?
(string.find(b, "memory") or string.find(b, "overflow")) then
error(b, 0) -- propagate it
end
M = M + 1 -- increase allocation limit
end
print(string.format("limit for %s: %d allocations", s, M))
return b
end
-- doing nothing
b = testamem("doing nothing", function () return 10 end)
assert(b == 10)
-- testing memory errors when creating a new state
b = testamem("state creation", T.newstate)
T.closestate(b); -- close new state
testamem("empty-table creation", function ()
return {}
end)
testamem("string creation", function ()
return "XXX" .. "YYY"
end)
testamem("coroutine creation", function()
return coroutine.create(print)
end)
-- testing to-be-closed variables
testamem("to-be-closed variables", function()
local flag
do
local x <close> =
setmetatable({}, {__close = function () flag = true end})
flag = false
local x = {}
end
return flag
end)
-- testing threads
-- get main thread from registry (at index LUA_RIDX_MAINTHREAD == 1)
mt = T.testC("rawgeti R 1; return 1")
assert(type(mt) == "thread" and coroutine.running() == mt)
function expand (n,s)
if n==0 then return "" end
local e = string.rep("=", n)
return string.format("T.doonnewstack([%s[ %s;\n collectgarbage(); %s]%s])\n",
e, s, expand(n-1,s), e)
end
G=0; collectgarbage(); a =collectgarbage("count")
load(expand(20,"G=G+1"))()
assert(G==20); collectgarbage(); -- assert(gcinfo() <= a+1)
testamem("running code on new thread", function ()
return T.doonnewstack("x=1") == 0 -- try to create thread
end)
-- testing memory x compiler
testamem("loadstring", function ()
return load("x=1") -- try to do load a string
end)
local testprog = [[
local function foo () return end
local t = {"x"}
a = "aaa"
for i = 1, #t do a=a..t[i] end
return true
]]
-- testing memory x dofile
_G.a = nil
local t =os.tmpname()
local f = assert(io.open(t, "w"))
f:write(testprog)
f:close()
testamem("dofile", function ()
local a = loadfile(t)
return a and a()
end)
assert(os.remove(t))
assert(_G.a == "aaax")
-- other generic tests
testamem("gsub", function ()
local a, b = string.gsub("alo alo", "(a)", function (x) return x..'b' end)
return (a == 'ablo ablo')
end)
testamem("dump/undump", function ()
local a = load(testprog)
local b = a and string.dump(a)
a = b and load(b)
return a and a()
end)
local t = os.tmpname()
testamem("file creation", function ()
local f = assert(io.open(t, 'w'))
assert (not io.open"nomenaoexistente")
io.close(f);
return not loadfile'nomenaoexistente'
end)
assert(os.remove(t))
testamem("table creation", function ()
local a, lim = {}, 10
for i=1,lim do a[i] = i; a[i..'a'] = {} end
return (type(a[lim..'a']) == 'table' and a[lim] == lim)
end)
testamem("constructors", function ()
local a = {10, 20, 30, 40, 50; a=1, b=2, c=3, d=4, e=5}
return (type(a) == 'table' and a.e == 5)
end)
local a = 1
close = nil
testamem("closure creation", function ()
function close (b)
return function (x) return b + x end
end
return (close(2)(4) == 6)
end)
testamem("using coroutines", function ()
local a = coroutine.wrap(function ()
coroutine.yield(string.rep("a", 10))
return {}
end)
assert(string.len(a()) == 10)
return a()
end)
do -- auxiliary buffer
local lim = 100
local a = {}; for i = 1, lim do a[i] = "01234567890123456789" end
testamem("auxiliary buffer", function ()
return (#table.concat(a, ",") == 20*lim + lim - 1)
end)
end
testamem("growing stack", function ()
local function foo (n)
if n == 0 then return 1 else return 1 + foo(n - 1) end
end
return foo(100)
end)
do -- testing failing in 'lua_checkstack'
local res = T.testC([[rawcheckstack 500000; return 1]])
assert(res == false)
local L = T.newstate()
T.alloccount(0) -- will be unable to reallocate the stack
res = T.testC(L, [[rawcheckstack 5000; return 1]])
T.alloccount()
T.closestate(L)
assert(res == false)
end
do -- closing state with no extra memory
local L = T.newstate()
T.alloccount(0)
T.closestate(L)
T.alloccount()
end
do -- garbage collection with no extra memory
local L = T.newstate()
T.loadlib(L)
local res = (T.doremote(L, [[
_ENV = require"_G"
local T = require"T"
local a = {}
for i = 1, 1000 do a[i] = 'i' .. i end -- grow string table
local stsize, stuse = T.querystr()
assert(stuse > 1000)
local function foo (n)
if n > 0 then foo(n - 1) end
end
foo(180) -- grow stack
local _, stksize = T.stacklevel()
assert(stksize > 180)
a = nil
T.alloccount(0)
collectgarbage()
T.alloccount()
-- stack and string table could not be reallocated,
-- so they kept their sizes (without errors)
assert(select(2, T.stacklevel()) == stksize)
assert(T.querystr() == stsize)
return 'ok'
]]))
assert(res == 'ok')
T.closestate(L)
end
print'+'
-- testing some auxlib functions
local function gsub (a, b, c)
a, b = T.testC("gsub 2 3 4; gettop; return 2", a, b, c)
assert(b == 5)
return a
end
assert(gsub("alo.alo.uhuh.", ".", "//") == "alo//alo//uhuh//")
assert(gsub("alo.alo.uhuh.", "alo", "//") == "//.//.uhuh.")
assert(gsub("", "alo", "//") == "")
assert(gsub("...", ".", "/.") == "/././.")
assert(gsub("...", "...", "") == "")
-- testing luaL_newmetatable
local mt_xuxu, res, top = T.testC("newmetatable xuxu; gettop; return 3")
assert(type(mt_xuxu) == "table" and res and top == 3)
local d, res, top = T.testC("newmetatable xuxu; gettop; return 3")
assert(mt_xuxu == d and not res and top == 3)
d, res, top = T.testC("newmetatable xuxu1; gettop; return 3")
assert(mt_xuxu ~= d and res and top == 3)
x = T.newuserdata(0);
y = T.newuserdata(0);
T.testC("pushstring xuxu; gettable R; setmetatable 2", x)
assert(getmetatable(x) == mt_xuxu)
-- testing luaL_testudata
-- correct metatable
local res1, res2, top = T.testC([[testudata -1 xuxu
testudata 2 xuxu
gettop
return 3]], x)
assert(res1 and res2 and top == 4)
-- wrong metatable
res1, res2, top = T.testC([[testudata -1 xuxu1
testudata 2 xuxu1
gettop
return 3]], x)
assert(not res1 and not res2 and top == 4)
-- non-existent type
res1, res2, top = T.testC([[testudata -1 xuxu2
testudata 2 xuxu2
gettop
return 3]], x)
assert(not res1 and not res2 and top == 4)
-- userdata has no metatable
res1, res2, top = T.testC([[testudata -1 xuxu
testudata 2 xuxu
gettop
return 3]], y)
assert(not res1 and not res2 and top == 4)
-- erase metatables
do
local r = debug.getregistry()
assert(r.xuxu == mt_xuxu and r.xuxu1 == d)
r.xuxu = nil; r.xuxu1 = nil
end
print'OK'
ATTRIB¶
-- $Id: testes/attrib.lua $
-- See Copyright Notice in file all.lua
print "testing require"
assert(require"string" == string)
assert(require"math" == math)
assert(require"table" == table)
assert(require"io" == io)
assert(require"os" == os)
assert(require"coroutine" == coroutine)
assert(type(package.path) == "string")
assert(type(package.cpath) == "string")
assert(type(package.loaded) == "table")
assert(type(package.preload) == "table")
assert(type(package.config) == "string")
print("package config: "..string.gsub(package.config, "\n", "|"))
do
-- create a path with 'max' templates,
-- each with 1-10 repetitions of '?'
local max = _soft and 100 or 2000
local t = {}
for i = 1,max do t[i] = string.rep("?", i%10 + 1) end
t[#t + 1] = ";" -- empty template
local path = table.concat(t, ";")
-- use that path in a search
local s, err = package.searchpath("xuxu", path)
-- search fails; check that message has an occurrence of
-- '??????????' with ? replaced by xuxu and at least 'max' lines
assert(not s and
string.find(err, string.rep("xuxu", 10)) and
#string.gsub(err, "[^\n]", "") >= max)
-- path with one very long template
local path = string.rep("?", max)
local s, err = package.searchpath("xuxu", path)
assert(not s and string.find(err, string.rep('xuxu', max)))
end
do
local oldpath = package.path
package.path = {}
local s, err = pcall(require, "no-such-file")
assert(not s and string.find(err, "package.path"))
package.path = oldpath
end
do print"testing 'require' message"
local oldpath = package.path
local oldcpath = package.cpath
package.path = "?.lua;?/?"
package.cpath = "?.so;?/init"
local st, msg = pcall(require, 'XXX')
local expected = [[module 'XXX' not found:
no field package.preload['XXX']
no file 'XXX.lua'
no file 'XXX/XXX'
no file 'XXX.so'
no file 'XXX/init']]
assert(msg == expected)
package.path = oldpath
package.cpath = oldcpath
end
print('+')
-- The next tests for 'require' assume some specific directories and
-- libraries.
if not _port then --[
local dirsep = string.match(package.config, "^([^\n]+)\n")
-- auxiliary directory with C modules and temporary files
local DIR = "libs" .. dirsep
-- prepend DIR to a name and correct directory separators
local function D (x)
x = string.gsub(x, "/", dirsep)
return DIR .. x
end
-- prepend DIR and pospend proper C lib. extension to a name
local function DC (x)
local ext = (dirsep == '\\') and ".dll" or ".so"
return D(x .. ext)
end
local function createfiles (files, preextras, posextras)
for n,c in pairs(files) do
io.output(D(n))
io.write(string.format(preextras, n))
io.write(c)
io.write(string.format(posextras, n))
io.close(io.output())
end
end
function removefiles (files)
for n in pairs(files) do
os.remove(D(n))
end
end
local files = {
["names.lua"] = "do return {...} end\n",
["err.lua"] = "B = 15; a = a + 1;",
["synerr.lua"] = "B =",
["A.lua"] = "",
["B.lua"] = "assert(...=='B');require 'A'",
["A.lc"] = "",
["A"] = "",
["L"] = "",
["XXxX"] = "",
["C.lua"] = "package.loaded[...] = 25; require'C'",
}
AA = nil
local extras = [[
NAME = '%s'
REQUIRED = ...
return AA]]
createfiles(files, "", extras)
-- testing explicit "dir" separator in 'searchpath'
assert(package.searchpath("C.lua", D"?", "", "") == D"C.lua")
assert(package.searchpath("C.lua", D"?", ".", ".") == D"C.lua")
assert(package.searchpath("--x-", D"?", "-", "X") == D"XXxX")
assert(package.searchpath("---xX", D"?", "---", "XX") == D"XXxX")
assert(package.searchpath(D"C.lua", "?", dirsep) == D"C.lua")
assert(package.searchpath(".\\C.lua", D"?", "\\") == D"./C.lua")
local oldpath = package.path
package.path = string.gsub("D/?.lua;D/?.lc;D/?;D/??x?;D/L", "D/", DIR)
local try = function (p, n, r, ext)
NAME = nil
local rr, x = require(p)
assert(NAME == n)
assert(REQUIRED == p)
assert(rr == r)
assert(ext == x)
end
a = require"names"
assert(a[1] == "names" and a[2] == D"names.lua")
_G.a = nil
local st, msg = pcall(require, "err")
assert(not st and string.find(msg, "arithmetic") and B == 15)
st, msg = pcall(require, "synerr")
assert(not st and string.find(msg, "error loading module"))
assert(package.searchpath("C", package.path) == D"C.lua")
assert(require"C" == 25)
assert(require"C" == 25)
AA = nil
try('B', 'B.lua', true, "libs/B.lua")
assert(package.loaded.B)
assert(require"B" == true)
assert(package.loaded.A)
assert(require"C" == 25)
package.loaded.A = nil
try('B', nil, true, nil) -- should not reload package
try('A', 'A.lua', true, "libs/A.lua")
package.loaded.A = nil
os.remove(D'A.lua')
AA = {}
try('A', 'A.lc', AA, "libs/A.lc") -- now must find second option
assert(package.searchpath("A", package.path) == D"A.lc")
assert(require("A") == AA)
AA = false
try('K', 'L', false, "libs/L") -- default option
try('K', 'L', false, "libs/L") -- default option (should reload it)
assert(rawget(_G, "_REQUIREDNAME") == nil)
AA = "x"
try("X", "XXxX", AA, "libs/XXxX")
removefiles(files)
-- testing require of sub-packages
local _G = _G
package.path = string.gsub("D/?.lua;D/?/init.lua", "D/", DIR)
files = {
["P1/init.lua"] = "AA = 10",
["P1/xuxu.lua"] = "AA = 20",
}
createfiles(files, "_ENV = {}\n", "\nreturn _ENV\n")
AA = 0
local m, ext = assert(require"P1")
assert(ext == "libs/P1/init.lua")
assert(AA == 0 and m.AA == 10)
assert(require"P1" == m)
assert(require"P1" == m)
assert(package.searchpath("P1.xuxu", package.path) == D"P1/xuxu.lua")
m.xuxu, ext = assert(require"P1.xuxu")
assert(AA == 0 and m.xuxu.AA == 20)
assert(ext == "libs/P1/xuxu.lua")
assert(require"P1.xuxu" == m.xuxu)
assert(require"P1.xuxu" == m.xuxu)
assert(require"P1" == m and m.AA == 10)
removefiles(files)
package.path = ""
assert(not pcall(require, "file_does_not_exist"))
package.path = "??\0?"
assert(not pcall(require, "file_does_not_exist1"))
package.path = oldpath
-- check 'require' error message
local fname = "file_does_not_exist2"
local m, err = pcall(require, fname)
for t in string.gmatch(package.path..";"..package.cpath, "[^;]+") do
t = string.gsub(t, "?", fname)
assert(string.find(err, t, 1, true))
end
do -- testing 'package.searchers' not being a table
local searchers = package.searchers
package.searchers = 3
local st, msg = pcall(require, 'a')
assert(not st and string.find(msg, "must be a table"))
package.searchers = searchers
end
local function import(...)
local f = {...}
return function (m)
for i=1, #f do m[f[i]] = _G[f[i]] end
end
end
-- cannot change environment of a C function
assert(not pcall(module, 'XUXU'))
-- testing require of C libraries
local p = "" -- On Mac OS X, redefine this to "_"
-- check whether loadlib works in this system
local st, err, when = package.loadlib(DC"lib1", "*")
if not st then
local f, err, when = package.loadlib("donotexist", p.."xuxu")
assert(not f and type(err) == "string" and when == "absent")
;(Message or print)('\n >>> cannot load dynamic library <<<\n')
print(err, when)
else
-- tests for loadlib
local f = assert(package.loadlib(DC"lib1", p.."onefunction"))
local a, b = f(15, 25)
assert(a == 25 and b == 15)
f = assert(package.loadlib(DC"lib1", p.."anotherfunc"))
assert(f(10, 20) == "10%20\n")
-- check error messages
local f, err, when = package.loadlib(DC"lib1", p.."xuxu")
assert(not f and type(err) == "string" and when == "init")
f, err, when = package.loadlib("donotexist", p.."xuxu")
assert(not f and type(err) == "string" and when == "open")
-- symbols from 'lib1' must be visible to other libraries
f = assert(package.loadlib(DC"lib11", p.."luaopen_lib11"))
assert(f() == "exported")
-- test C modules with prefixes in names
package.cpath = DC"?"
local lib2, ext = require"lib2-v2"
assert(string.find(ext, "libs/lib2-v2", 1, true))
-- check correct access to global environment and correct
-- parameters
assert(_ENV.x == "lib2-v2" and _ENV.y == DC"lib2-v2")
assert(lib2.id("x") == true) -- a different "id" implementation
-- test C submodules
local fs, ext = require"lib1.sub"
assert(_ENV.x == "lib1.sub" and _ENV.y == DC"lib1")
assert(string.find(ext, "libs/lib1", 1, true))
assert(fs.id(45) == 45)
end
_ENV = _G
-- testing preload
do
local p = package
package = {}
p.preload.pl = function (...)
local _ENV = {...}
function xuxu (x) return x+20 end
return _ENV
end
local pl, ext = require"pl"
assert(require"pl" == pl)
assert(pl.xuxu(10) == 30)
assert(pl[1] == "pl" and pl[2] == ":preload:" and ext == ":preload:")
package = p
assert(type(package.path) == "string")
end
print('+')
end --]
print("testing assignments, logical operators, and constructors")
local res, res2 = 27
a, b = 1, 2+3
assert(a==1 and b==5)
a={}
function f() return 10, 11, 12 end
a.x, b, a[1] = 1, 2, f()
assert(a.x==1 and b==2 and a[1]==10)
a[f()], b, a[f()+3] = f(), a, 'x'
assert(a[10] == 10 and b == a and a[13] == 'x')
do
local f = function (n) local x = {}; for i=1,n do x[i]=i end;
return table.unpack(x) end;
local a,b,c
a,b = 0, f(1)
assert(a == 0 and b == 1)
A,b = 0, f(1)
assert(A == 0 and b == 1)
a,b,c = 0,5,f(4)
assert(a==0 and b==5 and c==1)
a,b,c = 0,5,f(0)
assert(a==0 and b==5 and c==nil)
end
a, b, c, d = 1 and nil, 1 or nil, (1 and (nil or 1)), 6
assert(not a and b and c and d==6)
d = 20
a, b, c, d = f()
assert(a==10 and b==11 and c==12 and d==nil)
a,b = f(), 1, 2, 3, f()
assert(a==10 and b==1)
assert(a<b == false and a>b == true)
assert((10 and 2) == 2)
assert((10 or 2) == 10)
assert((10 or assert(nil)) == 10)
assert(not (nil and assert(nil)))
assert((nil or "alo") == "alo")
assert((nil and 10) == nil)
assert((false and 10) == false)
assert((true or 10) == true)
assert((false or 10) == 10)
assert(false ~= nil)
assert(nil ~= false)
assert(not nil == true)
assert(not not nil == false)
assert(not not 1 == true)
assert(not not a == true)
assert(not not (6 or nil) == true)
assert(not not (nil and 56) == false)
assert(not not (nil and true) == false)
assert(not 10 == false)
assert(not {} == false)
assert(not 0.5 == false)
assert(not "x" == false)
assert({} ~= {})
print('+')
a = {}
a[true] = 20
a[false] = 10
assert(a[1<2] == 20 and a[1>2] == 10)
function f(a) return a end
local a = {}
for i=3000,-3000,-1 do a[i + 0.0] = i; end
a[10e30] = "alo"; a[true] = 10; a[false] = 20
assert(a[10e30] == 'alo' and a[not 1] == 20 and a[10<20] == 10)
for i=3000,-3000,-1 do assert(a[i] == i); end
a[print] = assert
a[f] = print
a[a] = a
assert(a[a][a][a][a][print] == assert)
a[print](a[a[f]] == a[print])
assert(not pcall(function () local a = {}; a[nil] = 10 end))
assert(not pcall(function () local a = {[nil] = 10} end))
assert(a[nil] == undef)
a = nil
a = {10,9,8,7,6,5,4,3,2; [-3]='a', [f]=print, a='a', b='ab'}
a, a.x, a.y = a, a[-3]
assert(a[1]==10 and a[-3]==a.a and a[f]==print and a.x=='a' and not a.y)
a[1], f(a)[2], b, c = {['alo']=assert}, 10, a[1], a[f], 6, 10, 23, f(a), 2
a[1].alo(a[2]==10 and b==10 and c==print)
a.aVeryLongName012345678901234567890123456789012345678901234567890123456789 = 10
local function foo ()
return a.aVeryLongName012345678901234567890123456789012345678901234567890123456789
end
assert(foo() == 10 and
a.aVeryLongName012345678901234567890123456789012345678901234567890123456789 ==
10)
-- test of large float/integer indices
-- compute maximum integer where all bits fit in a float
local maxint = math.maxinteger
-- trim (if needed) to fit in a float
while maxint ~= (maxint + 0.0) or (maxint - 1) ~= (maxint - 1.0) do
maxint = maxint // 2
end
maxintF = maxint + 0.0 -- float version
assert(maxintF == maxint and math.type(maxintF) == "float" and
maxintF >= 2.0^14)
-- floats and integers must index the same places
a[maxintF] = 10; a[maxintF - 1.0] = 11;
a[-maxintF] = 12; a[-maxintF + 1.0] = 13;
assert(a[maxint] == 10 and a[maxint - 1] == 11 and
a[-maxint] == 12 and a[-maxint + 1] == 13)
a[maxint] = 20
a[-maxint] = 22
assert(a[maxintF] == 20 and a[maxintF - 1.0] == 11 and
a[-maxintF] == 22 and a[-maxintF + 1.0] == 13)
a = nil
-- test conflicts in multiple assignment
do
local a,i,j,b
a = {'a', 'b'}; i=1; j=2; b=a
i, a[i], a, j, a[j], a[i+j] = j, i, i, b, j, i
assert(i == 2 and b[1] == 1 and a == 1 and j == b and b[2] == 2 and
b[3] == 1)
a = {}
local function foo () -- assigining to upvalues
b, a.x, a = a, 10, 20
end
foo()
assert(a == 20 and b.x == 10)
end
-- repeat test with upvalues
do
local a,i,j,b
a = {'a', 'b'}; i=1; j=2; b=a
local function foo ()
i, a[i], a, j, a[j], a[i+j] = j, i, i, b, j, i
end
foo()
assert(i == 2 and b[1] == 1 and a == 1 and j == b and b[2] == 2 and
b[3] == 1)
local t = {}
(function (a) t[a], a = 10, 20 end)(1);
assert(t[1] == 10)
end
-- bug in 5.2 beta
local function foo ()
local a
return function ()
local b
a, b = 3, 14 -- local and upvalue have same index
return a, b
end
end
local a, b = foo()()
assert(a == 3 and b == 14)
print('OK')
return res
BIG¶
-- $Id: testes/big.lua $
-- See Copyright Notice in file all.lua
if _soft then
return 'a'
end
print "testing large tables"
local debug = require"debug"
local lim = 2^18 + 1000
local prog = { "local y = {0" }
for i = 1, lim do prog[#prog + 1] = i end
prog[#prog + 1] = "}\n"
prog[#prog + 1] = "X = y\n"
prog[#prog + 1] = ("assert(X[%d] == %d)"):format(lim - 1, lim - 2)
prog[#prog + 1] = "return 0"
prog = table.concat(prog, ";")
local env = {string = string, assert = assert}
local f = assert(load(prog, nil, nil, env))
f()
assert(env.X[lim] == lim - 1 and env.X[lim + 1] == lim)
for k in pairs(env) do env[k] = undef end
-- yields during accesses larger than K (in RK)
setmetatable(env, {
__index = function (t, n) coroutine.yield('g'); return _G[n] end,
__newindex = function (t, n, v) coroutine.yield('s'); _G[n] = v end,
})
X = nil
co = coroutine.wrap(f)
assert(co() == 's')
assert(co() == 'g')
assert(co() == 'g')
assert(co() == 0)
assert(X[lim] == lim - 1 and X[lim + 1] == lim)
-- errors in accesses larger than K (in RK)
getmetatable(env).__index = function () end
getmetatable(env).__newindex = function () end
local e, m = pcall(f)
assert(not e and m:find("global 'X'"))
-- errors in metamethods
getmetatable(env).__newindex = function () error("hi") end
local e, m = xpcall(f, debug.traceback)
assert(not e and m:find("'newindex'"))
f, X = nil
coroutine.yield'b'
if 2^32 == 0 then -- (small integers) {
print "testing string length overflow"
local repstrings = 192 -- number of strings to be concatenated
local ssize = math.ceil(2.0^32 / repstrings) + 1 -- size of each string
assert(repstrings * ssize > 2.0^32) -- it should be larger than maximum size
local longs = string.rep("\0", ssize) -- create one long string
-- create function to concatenate 'repstrings' copies of its argument
local rep = assert(load(
"local a = ...; return " .. string.rep("a", repstrings, "..")))
local a, b = pcall(rep, longs) -- call that function
-- it should fail without creating string (result would be too large)
assert(not a and string.find(b, "overflow"))
end -- }
print'OK'
return 'a'
BITWISE¶
-- $Id: testes/bitwise.lua $
-- See Copyright Notice in file all.lua
print("testing bitwise operations")
require "bwcoercion"
local numbits = string.packsize('j') * 8
assert(~0 == -1)
assert((1 << (numbits - 1)) == math.mininteger)
-- basic tests for bitwise operators;
-- use variables to avoid constant folding
local a, b, c, d
a = 0xFFFFFFFFFFFFFFFF
assert(a == -1 and a & -1 == a and a & 35 == 35)
a = 0xF0F0F0F0F0F0F0F0
assert(a | -1 == -1)
assert(a ~ a == 0 and a ~ 0 == a and a ~ ~a == -1)
assert(a >> 4 == ~a)
a = 0xF0; b = 0xCC; c = 0xAA; d = 0xFD
assert(a | b ~ c & d == 0xF4)
a = 0xF0.0; b = 0xCC.0; c = "0xAA.0"; d = "0xFD.0"
assert(a | b ~ c & d == 0xF4)
a = 0xF0000000; b = 0xCC000000;
c = 0xAA000000; d = 0xFD000000
assert(a | b ~ c & d == 0xF4000000)
assert(~~a == a and ~a == -1 ~ a and -d == ~d + 1)
a = a << 32
b = b << 32
c = c << 32
d = d << 32
assert(a | b ~ c & d == 0xF4000000 << 32)
assert(~~a == a and ~a == -1 ~ a and -d == ~d + 1)
assert(-1 >> 1 == (1 << (numbits - 1)) - 1 and 1 << 31 == 0x80000000)
assert(-1 >> (numbits - 1) == 1)
assert(-1 >> numbits == 0 and
-1 >> -numbits == 0 and
-1 << numbits == 0 and
-1 << -numbits == 0)
assert((2^30 - 1) << 2^30 == 0)
assert((2^30 - 1) >> 2^30 == 0)
assert(1 >> -3 == 1 << 3 and 1000 >> 5 == 1000 << -5)
-- coercion from strings to integers
assert("0xffffffffffffffff" | 0 == -1)
assert("0xfffffffffffffffe" & "-1" == -2)
assert(" \t-0xfffffffffffffffe\n\t" & "-1" == 2)
assert(" \n -45 \t " >> " -2 " == -45 * 4)
assert("1234.0" << "5.0" == 1234 * 32)
assert("0xffff.0" ~ "0xAAAA" == 0x5555)
assert(~"0x0.000p4" == -1)
assert(("7" .. 3) << 1 == 146)
assert(0xffffffff >> (1 .. "9") == 0x1fff)
assert(10 | (1 .. "9") == 27)
do
local st, msg = pcall(function () return 4 & "a" end)
assert(string.find(msg, "'band'"))
local st, msg = pcall(function () return ~"a" end)
assert(string.find(msg, "'bnot'"))
end
-- out of range number
assert(not pcall(function () return "0xffffffffffffffff.0" | 0 end))
-- embedded zeros
assert(not pcall(function () return "0xffffffffffffffff\0" | 0 end))
print'+'
package.preload.bit32 = function () --{
-- no built-in 'bit32' library: implement it using bitwise operators
local bit = {}
function bit.bnot (a)
return ~a & 0xFFFFFFFF
end
--
-- in all vararg functions, avoid creating 'arg' table when there are
-- only 2 (or less) parameters, as 2 parameters is the common case
--
function bit.band (x, y, z, ...)
if not z then
return ((x or -1) & (y or -1)) & 0xFFFFFFFF
else
local arg = {...}
local res = x & y & z
for i = 1, #arg do res = res & arg[i] end
return res & 0xFFFFFFFF
end
end
function bit.bor (x, y, z, ...)
if not z then
return ((x or 0) | (y or 0)) & 0xFFFFFFFF
else
local arg = {...}
local res = x | y | z
for i = 1, #arg do res = res | arg[i] end
return res & 0xFFFFFFFF
end
end
function bit.bxor (x, y, z, ...)
if not z then
return ((x or 0) ~ (y or 0)) & 0xFFFFFFFF
else
local arg = {...}
local res = x ~ y ~ z
for i = 1, #arg do res = res ~ arg[i] end
return res & 0xFFFFFFFF
end
end
function bit.btest (...)
return bit.band(...) ~= 0
end
function bit.lshift (a, b)
return ((a & 0xFFFFFFFF) << b) & 0xFFFFFFFF
end
function bit.rshift (a, b)
return ((a & 0xFFFFFFFF) >> b) & 0xFFFFFFFF
end
function bit.arshift (a, b)
a = a & 0xFFFFFFFF
if b <= 0 or (a & 0x80000000) == 0 then
return (a >> b) & 0xFFFFFFFF
else
return ((a >> b) | ~(0xFFFFFFFF >> b)) & 0xFFFFFFFF
end
end
function bit.lrotate (a ,b)
b = b & 31
a = a & 0xFFFFFFFF
a = (a << b) | (a >> (32 - b))
return a & 0xFFFFFFFF
end
function bit.rrotate (a, b)
return bit.lrotate(a, -b)
end
local function checkfield (f, w)
w = w or 1
assert(f >= 0, "field cannot be negative")
assert(w > 0, "width must be positive")
assert(f + w <= 32, "trying to access non-existent bits")
return f, ~(-1 << w)
end
function bit.extract (a, f, w)
local f, mask = checkfield(f, w)
return (a >> f) & mask
end
function bit.replace (a, v, f, w)
local f, mask = checkfield(f, w)
v = v & mask
a = (a & ~(mask << f)) | (v << f)
return a & 0xFFFFFFFF
end
return bit
end --}
print("testing bitwise library")
local bit32 = require'bit32'
assert(bit32.band() == bit32.bnot(0))
assert(bit32.btest() == true)
assert(bit32.bor() == 0)
assert(bit32.bxor() == 0)
assert(bit32.band() == bit32.band(0xffffffff))
assert(bit32.band(1,2) == 0)
-- out-of-range numbers
assert(bit32.band(-1) == 0xffffffff)
assert(bit32.band((1 << 33) - 1) == 0xffffffff)
assert(bit32.band(-(1 << 33) - 1) == 0xffffffff)
assert(bit32.band((1 << 33) + 1) == 1)
assert(bit32.band(-(1 << 33) + 1) == 1)
assert(bit32.band(-(1 << 40)) == 0)
assert(bit32.band(1 << 40) == 0)
assert(bit32.band(-(1 << 40) - 2) == 0xfffffffe)
assert(bit32.band((1 << 40) - 4) == 0xfffffffc)
assert(bit32.lrotate(0, -1) == 0)
assert(bit32.lrotate(0, 7) == 0)
assert(bit32.lrotate(0x12345678, 0) == 0x12345678)
assert(bit32.lrotate(0x12345678, 32) == 0x12345678)
assert(bit32.lrotate(0x12345678, 4) == 0x23456781)
assert(bit32.rrotate(0x12345678, -4) == 0x23456781)
assert(bit32.lrotate(0x12345678, -8) == 0x78123456)
assert(bit32.rrotate(0x12345678, 8) == 0x78123456)
assert(bit32.lrotate(0xaaaaaaaa, 2) == 0xaaaaaaaa)
assert(bit32.lrotate(0xaaaaaaaa, -2) == 0xaaaaaaaa)
for i = -50, 50 do
assert(bit32.lrotate(0x89abcdef, i) == bit32.lrotate(0x89abcdef, i%32))
end
assert(bit32.lshift(0x12345678, 4) == 0x23456780)
assert(bit32.lshift(0x12345678, 8) == 0x34567800)
assert(bit32.lshift(0x12345678, -4) == 0x01234567)
assert(bit32.lshift(0x12345678, -8) == 0x00123456)
assert(bit32.lshift(0x12345678, 32) == 0)
assert(bit32.lshift(0x12345678, -32) == 0)
assert(bit32.rshift(0x12345678, 4) == 0x01234567)
assert(bit32.rshift(0x12345678, 8) == 0x00123456)
assert(bit32.rshift(0x12345678, 32) == 0)
assert(bit32.rshift(0x12345678, -32) == 0)
assert(bit32.arshift(0x12345678, 0) == 0x12345678)
assert(bit32.arshift(0x12345678, 1) == 0x12345678 // 2)
assert(bit32.arshift(0x12345678, -1) == 0x12345678 * 2)
assert(bit32.arshift(-1, 1) == 0xffffffff)
assert(bit32.arshift(-1, 24) == 0xffffffff)
assert(bit32.arshift(-1, 32) == 0xffffffff)
assert(bit32.arshift(-1, -1) == bit32.band(-1 * 2, 0xffffffff))
assert(0x12345678 << 4 == 0x123456780)
assert(0x12345678 << 8 == 0x1234567800)
assert(0x12345678 << -4 == 0x01234567)
assert(0x12345678 << -8 == 0x00123456)
assert(0x12345678 << 32 == 0x1234567800000000)
assert(0x12345678 << -32 == 0)
assert(0x12345678 >> 4 == 0x01234567)
assert(0x12345678 >> 8 == 0x00123456)
assert(0x12345678 >> 32 == 0)
assert(0x12345678 >> -32 == 0x1234567800000000)
print("+")
-- some special cases
local c = {0, 1, 2, 3, 10, 0x80000000, 0xaaaaaaaa, 0x55555555,
0xffffffff, 0x7fffffff}
for _, b in pairs(c) do
assert(bit32.band(b) == b)
assert(bit32.band(b, b) == b)
assert(bit32.band(b, b, b, b) == b)
assert(bit32.btest(b, b) == (b ~= 0))
assert(bit32.band(b, b, b) == b)
assert(bit32.band(b, b, b, ~b) == 0)
assert(bit32.btest(b, b, b) == (b ~= 0))
assert(bit32.band(b, bit32.bnot(b)) == 0)
assert(bit32.bor(b, bit32.bnot(b)) == bit32.bnot(0))
assert(bit32.bor(b) == b)
assert(bit32.bor(b, b) == b)
assert(bit32.bor(b, b, b) == b)
assert(bit32.bor(b, b, 0, ~b) == 0xffffffff)
assert(bit32.bxor(b) == b)
assert(bit32.bxor(b, b) == 0)
assert(bit32.bxor(b, b, b) == b)
assert(bit32.bxor(b, b, b, b) == 0)
assert(bit32.bxor(b, 0) == b)
assert(bit32.bnot(b) ~= b)
assert(bit32.bnot(bit32.bnot(b)) == b)
assert(bit32.bnot(b) == (1 << 32) - 1 - b)
assert(bit32.lrotate(b, 32) == b)
assert(bit32.rrotate(b, 32) == b)
assert(bit32.lshift(bit32.lshift(b, -4), 4) == bit32.band(b, bit32.bnot(0xf)))
assert(bit32.rshift(bit32.rshift(b, 4), -4) == bit32.band(b, bit32.bnot(0xf)))
end
-- for this test, use at most 24 bits (mantissa of a single float)
c = {0, 1, 2, 3, 10, 0x800000, 0xaaaaaa, 0x555555, 0xffffff, 0x7fffff}
for _, b in pairs(c) do
for i = -40, 40 do
local x = bit32.lshift(b, i)
local y = math.floor(math.fmod(b * 2.0^i, 2.0^32))
assert(math.fmod(x - y, 2.0^32) == 0)
end
end
assert(not pcall(bit32.band, {}))
assert(not pcall(bit32.bnot, "a"))
assert(not pcall(bit32.lshift, 45))
assert(not pcall(bit32.lshift, 45, print))
assert(not pcall(bit32.rshift, 45, print))
print("+")
-- testing extract/replace
assert(bit32.extract(0x12345678, 0, 4) == 8)
assert(bit32.extract(0x12345678, 4, 4) == 7)
assert(bit32.extract(0xa0001111, 28, 4) == 0xa)
assert(bit32.extract(0xa0001111, 31, 1) == 1)
assert(bit32.extract(0x50000111, 31, 1) == 0)
assert(bit32.extract(0xf2345679, 0, 32) == 0xf2345679)
assert(not pcall(bit32.extract, 0, -1))
assert(not pcall(bit32.extract, 0, 32))
assert(not pcall(bit32.extract, 0, 0, 33))
assert(not pcall(bit32.extract, 0, 31, 2))
assert(bit32.replace(0x12345678, 5, 28, 4) == 0x52345678)
assert(bit32.replace(0x12345678, 0x87654321, 0, 32) == 0x87654321)
assert(bit32.replace(0, 1, 2) == 2^2)
assert(bit32.replace(0, -1, 4) == 2^4)
assert(bit32.replace(-1, 0, 31) == (1 << 31) - 1)
assert(bit32.replace(-1, 0, 1, 2) == (1 << 32) - 7)
-- testing conversion of floats
assert(bit32.bor(3.0) == 3)
assert(bit32.bor(-4.0) == 0xfffffffc)
-- large floats and large-enough integers?
if 2.0^50 < 2.0^50 + 1.0 and 2.0^50 < (-1 >> 1) then
assert(bit32.bor(2.0^32 - 5.0) == 0xfffffffb)
assert(bit32.bor(-2.0^32 - 6.0) == 0xfffffffa)
assert(bit32.bor(2.0^48 - 5.0) == 0xfffffffb)
assert(bit32.bor(-2.0^48 - 6.0) == 0xfffffffa)
end
print'OK'
CALLS¶
-- $Id: testes/calls.lua $
-- See Copyright Notice in file all.lua
print("testing functions and calls")
local debug = require "debug"
-- get the opportunity to test 'type' too ;)
assert(type(1<2) == 'boolean')
assert(type(true) == 'boolean' and type(false) == 'boolean')
assert(type(nil) == 'nil'
and type(-3) == 'number'
and type'x' == 'string'
and type{} == 'table'
and type(type) == 'function')
assert(type(assert) == type(print))
function f (x) return a:x (x) end
assert(type(f) == 'function')
assert(not pcall(type))
-- testing local-function recursion
fact = false
do
local res = 1
local function fact (n)
if n==0 then return res
else return n*fact(n-1)
end
end
assert(fact(5) == 120)
end
assert(fact == false)
-- testing declarations
a = {i = 10}
self = 20
function a:x (x) return x+self.i end
function a.y (x) return x+self end
assert(a:x(1)+10 == a.y(1))
a.t = {i=-100}
a["t"].x = function (self, a,b) return self.i+a+b end
assert(a.t:x(2,3) == -95)
do
local a = {x=0}
function a:add (x) self.x, a.y = self.x+x, 20; return self end
assert(a:add(10):add(20):add(30).x == 60 and a.y == 20)
end
local a = {b={c={}}}
function a.b.c.f1 (x) return x+1 end
function a.b.c:f2 (x,y) self[x] = y end
assert(a.b.c.f1(4) == 5)
a.b.c:f2('k', 12); assert(a.b.c.k == 12)
print('+')
t = nil -- 'declare' t
function f(a,b,c) local d = 'a'; t={a,b,c,d} end
f( -- this line change must be valid
1,2)
assert(t[1] == 1 and t[2] == 2 and t[3] == nil and t[4] == 'a')
f(1,2, -- this one too
3,4)
assert(t[1] == 1 and t[2] == 2 and t[3] == 3 and t[4] == 'a')
function fat(x)
if x <= 1 then return 1
else return x*load("return fat(" .. x-1 .. ")", "")()
end
end
assert(load "load 'assert(fat(6)==720)' () ")()
a = load('return fat(5), 3')
a,b = a()
assert(a == 120 and b == 3)
print('+')
function err_on_n (n)
if n==0 then error(); exit(1);
else err_on_n (n-1); exit(1);
end
end
do
function dummy (n)
if n > 0 then
assert(not pcall(err_on_n, n))
dummy(n-1)
end
end
end
dummy(10)
function deep (n)
if n>0 then deep(n-1) end
end
deep(10)
deep(180)
print"testing tail calls"
function deep (n) if n>0 then return deep(n-1) else return 101 end end
assert(deep(30000) == 101)
a = {}
function a:deep (n) if n>0 then return self:deep(n-1) else return 101 end end
assert(a:deep(30000) == 101)
do -- tail calls x varargs
local function foo (x, ...) local a = {...}; return x, a[1], a[2] end
local function foo1 (x) return foo(10, x, x + 1) end
local a, b, c = foo1(-2)
assert(a == 10 and b == -2 and c == -1)
-- tail calls x metamethods
local t = setmetatable({}, {__call = foo})
local function foo2 (x) return t(10, x) end
a, b, c = foo2(100)
assert(a == t and b == 10 and c == 100)
a, b = (function () return foo() end)()
assert(a == nil and b == nil)
local X, Y, A
local function foo (x, y, ...) X = x; Y = y; A = {...} end
local function foo1 (...) return foo(...) end
local a, b, c = foo1()
assert(X == nil and Y == nil and #A == 0)
a, b, c = foo1(10)
assert(X == 10 and Y == nil and #A == 0)
a, b, c = foo1(10, 20)
assert(X == 10 and Y == 20 and #A == 0)
a, b, c = foo1(10, 20, 30)
assert(X == 10 and Y == 20 and #A == 1 and A[1] == 30)
end
do -- tail calls x chain of __call
local n = 10000 -- depth
local function foo ()
if n == 0 then return 1023
else n = n - 1; return foo()
end
end
-- build a chain of __call metamethods ending in function 'foo'
for i = 1, 100 do
foo = setmetatable({}, {__call = foo})
end
-- call the first one as a tail call in a new coroutine
-- (to ensure stack is not preallocated)
assert(coroutine.wrap(function() return foo() end)() == 1023)
end
print('+')
do -- testing chains of '__call'
local N = 20
local u = table.pack
for i = 1, N do
u = setmetatable({i}, {__call = u})
end
local Res = u("a", "b", "c")
assert(Res.n == N + 3)
for i = 1, N do
assert(Res[i][1] == i)
end
assert(Res[N + 1] == "a" and Res[N + 2] == "b" and Res[N + 3] == "c")
end
a = nil
(function (x) a=x end)(23)
assert(a == 23 and (function (x) return x*2 end)(20) == 40)
-- testing closures
-- fixed-point operator
Z = function (le)
local function a (f)
return le(function (x) return f(f)(x) end)
end
return a(a)
end
-- non-recursive factorial
F = function (f)
return function (n)
if n == 0 then return 1
else return n*f(n-1) end
end
end
fat = Z(F)
assert(fat(0) == 1 and fat(4) == 24 and Z(F)(5)==5*Z(F)(4))
local function g (z)
local function f (a,b,c,d)
return function (x,y) return a+b+c+d+a+x+y+z end
end
return f(z,z+1,z+2,z+3)
end
f = g(10)
assert(f(9, 16) == 10+11+12+13+10+9+16+10)
Z, F, f = nil
print('+')
-- testing multiple returns
function unlpack (t, i)
i = i or 1
if (i <= #t) then
return t[i], unlpack(t, i+1)
end
end
function equaltab (t1, t2)
assert(#t1 == #t2)
for i = 1, #t1 do
assert(t1[i] == t2[i])
end
end
local pack = function (...) return (table.pack(...)) end
function f() return 1,2,30,4 end
function ret2 (a,b) return a,b end
local a,b,c,d = unlpack{1,2,3}
assert(a==1 and b==2 and c==3 and d==nil)
a = {1,2,3,4,false,10,'alo',false,assert}
equaltab(pack(unlpack(a)), a)
equaltab(pack(unlpack(a), -1), {1,-1})
a,b,c,d = ret2(f()), ret2(f())
assert(a==1 and b==1 and c==2 and d==nil)
a,b,c,d = unlpack(pack(ret2(f()), ret2(f())))
assert(a==1 and b==1 and c==2 and d==nil)
a,b,c,d = unlpack(pack(ret2(f()), (ret2(f()))))
assert(a==1 and b==1 and c==nil and d==nil)
a = ret2{ unlpack{1,2,3}, unlpack{3,2,1}, unlpack{"a", "b"}}
assert(a[1] == 1 and a[2] == 3 and a[3] == "a" and a[4] == "b")
-- testing calls with 'incorrect' arguments
rawget({}, "x", 1)
rawset({}, "x", 1, 2)
assert(math.sin(1,2) == math.sin(1))
table.sort({10,9,8,4,19,23,0,0}, function (a,b) return a<b end, "extra arg")
-- test for generic load
local x = "-- a comment\0\0\0\n x = 10 + \n23; \
local a = function () x = 'hi' end; \
return '\0'"
function read1 (x)
local i = 0
return function ()
collectgarbage()
i=i+1
return string.sub(x, i, i)
end
end
function cannotload (msg, a,b)
assert(not a and string.find(b, msg))
end
a = assert(load(read1(x), "modname", "t", _G))
assert(a() == "\0" and _G.x == 33)
assert(debug.getinfo(a).source == "modname")
-- cannot read text in binary mode
cannotload("attempt to load a text chunk", load(read1(x), "modname", "b", {}))
cannotload("attempt to load a text chunk", load(x, "modname", "b"))
a = assert(load(function () return nil end))
a() -- empty chunk
assert(not load(function () return true end))
-- small bug
local t = {nil, "return ", "3"}
f, msg = load(function () return table.remove(t, 1) end)
assert(f() == nil) -- should read the empty chunk
-- another small bug (in 5.2.1)
f = load(string.dump(function () return 1 end), nil, "b", {})
assert(type(f) == "function" and f() == 1)
x = string.dump(load("x = 1; return x"))
a = assert(load(read1(x), nil, "b"))
assert(a() == 1 and _G.x == 1)
cannotload("attempt to load a binary chunk", load(read1(x), nil, "t"))
cannotload("attempt to load a binary chunk", load(x, nil, "t"))
assert(not pcall(string.dump, print)) -- no dump of C functions
cannotload("unexpected symbol", load(read1("*a = 123")))
cannotload("unexpected symbol", load("*a = 123"))
cannotload("hhi", load(function () error("hhi") end))
-- any value is valid for _ENV
assert(load("return _ENV", nil, nil, 123)() == 123)
-- load when _ENV is not first upvalue
local x; XX = 123
local function h ()
local y=x -- use 'x', so that it becomes 1st upvalue
return XX -- global name
end
local d = string.dump(h)
x = load(d, "", "b")
assert(debug.getupvalue(x, 2) == '_ENV')
debug.setupvalue(x, 2, _G)
assert(x() == 123)
assert(assert(load("return XX + ...", nil, nil, {XX = 13}))(4) == 17)
-- test generic load with nested functions
x = [[
return function (x)
return function (y)
return function (z)
return x+y+z
end
end
end
]]
a = assert(load(read1(x)))
assert(a()(2)(3)(10) == 15)
-- test for dump/undump with upvalues
local a, b = 20, 30
x = load(string.dump(function (x)
if x == "set" then a = 10+b; b = b+1 else
return a
end
end), "", "b", nil)
assert(x() == nil)
assert(debug.setupvalue(x, 1, "hi") == "a")
assert(x() == "hi")
assert(debug.setupvalue(x, 2, 13) == "b")
assert(not debug.setupvalue(x, 3, 10)) -- only 2 upvalues
x("set")
assert(x() == 23)
x("set")
assert(x() == 24)
-- test for dump/undump with many upvalues
do
local nup = 200 -- maximum number of local variables
local prog = {"local a1"}
for i = 2, nup do prog[#prog + 1] = ", a" .. i end
prog[#prog + 1] = " = 1"
for i = 2, nup do prog[#prog + 1] = ", " .. i end
local sum = 1
prog[#prog + 1] = "; return function () return a1"
for i = 2, nup do prog[#prog + 1] = " + a" .. i; sum = sum + i end
prog[#prog + 1] = " end"
prog = table.concat(prog)
local f = assert(load(prog))()
assert(f() == sum)
f = load(string.dump(f)) -- main chunk now has many upvalues
local a = 10
local h = function () return a end
for i = 1, nup do
debug.upvaluejoin(f, i, h, 1)
end
assert(f() == 10 * nup)
end
-- test for long method names
do
local t = {x = 1}
function t:_012345678901234567890123456789012345678901234567890123456789 ()
return self.x
end
assert(t:_012345678901234567890123456789012345678901234567890123456789() == 1)
end
-- test for bug in parameter adjustment
assert((function () return nil end)(4) == nil)
assert((function () local a; return a end)(4) == nil)
assert((function (a) return a end)() == nil)
print("testing binary chunks")
do
local header = string.pack("c4BBc6BBBj",
"\27Lua", -- signature
0x54, -- version 5.4 (0x54)
0, -- format
"\x19\x93\r\n\x1a\n", -- data
4, -- size of instruction
string.packsize("j"), -- sizeof(lua integer)
string.packsize("n"), -- sizeof(lua number)
0x5678 -- LUAC_INT
-- LUAC_NUM may not have a unique binary representation (padding...)
)
local c = string.dump(function () local a = 1; local b = 3; return a+b*3 end)
assert(string.sub(c, 1, #header) == header)
-- corrupted header
for i = 1, #header do
local s = string.sub(c, 1, i - 1) ..
string.char(string.byte(string.sub(c, i, i)) + 1) ..
string.sub(c, i + 1, -1)
assert(#s == #c)
assert(not load(s))
end
-- loading truncated binary chunks
for i = 1, #c - 1 do
local st, msg = load(string.sub(c, 1, i))
assert(not st and string.find(msg, "truncated"))
end
assert(assert(load(c))() == 10)
end
print('OK')
return deep
CLOSURE¶
-- $Id: testes/closure.lua $
-- See Copyright Notice in file all.lua
print "testing closures"
local A,B = 0,{g=10}
function f(x)
local a = {}
for i=1,1000 do
local y = 0
do
a[i] = function () B.g = B.g+1; y = y+x; return y+A end
end
end
local dummy = function () return a[A] end
collectgarbage()
A = 1; assert(dummy() == a[1]); A = 0;
assert(a[1]() == x)
assert(a[3]() == x)
collectgarbage()
assert(B.g == 12)
return a
end
local a = f(10)
-- force a GC in this level
local x = {[1] = {}} -- to detect a GC
setmetatable(x, {__mode = 'kv'})
while x[1] do -- repeat until GC
local a = A..A..A..A -- create garbage
A = A+1
end
assert(a[1]() == 20+A)
assert(a[1]() == 30+A)
assert(a[2]() == 10+A)
collectgarbage()
assert(a[2]() == 20+A)
assert(a[2]() == 30+A)
assert(a[3]() == 20+A)
assert(a[8]() == 10+A)
assert(getmetatable(x).__mode == 'kv')
assert(B.g == 19)
-- testing equality
a = {}
for i = 1, 5 do a[i] = function (x) return i + a + _ENV end end
assert(a[3] ~= a[4] and a[4] ~= a[5])
do
local a = function (x) return math.sin(_ENV[x]) end
local function f()
return a
end
assert(f() == f())
end
-- testing closures with 'for' control variable
a = {}
for i=1,10 do
a[i] = {set = function(x) i=x end, get = function () return i end}
if i == 3 then break end
end
assert(a[4] == undef)
a[1].set(10)
assert(a[2].get() == 2)
a[2].set('a')
assert(a[3].get() == 3)
assert(a[2].get() == 'a')
a = {}
local t = {"a", "b"}
for i = 1, #t do
local k = t[i]
a[i] = {set = function(x, y) i=x; k=y end,
get = function () return i, k end}
if i == 2 then break end
end
a[1].set(10, 20)
local r,s = a[2].get()
assert(r == 2 and s == 'b')
r,s = a[1].get()
assert(r == 10 and s == 20)
a[2].set('a', 'b')
r,s = a[2].get()
assert(r == "a" and s == "b")
-- testing closures with 'for' control variable x break
for i=1,3 do
f = function () return i end
break
end
assert(f() == 1)
for k = 1, #t do
local v = t[k]
f = function () return k, v end
break
end
assert(({f()})[1] == 1)
assert(({f()})[2] == "a")
-- testing closure x break x return x errors
local b
function f(x)
local first = 1
while 1 do
if x == 3 and not first then return end
local a = 'xuxu'
b = function (op, y)
if op == 'set' then
a = x+y
else
return a
end
end
if x == 1 then do break end
elseif x == 2 then return
else if x ~= 3 then error() end
end
first = nil
end
end
for i=1,3 do
f(i)
assert(b('get') == 'xuxu')
b('set', 10); assert(b('get') == 10+i)
b = nil
end
pcall(f, 4);
assert(b('get') == 'xuxu')
b('set', 10); assert(b('get') == 14)
local w
-- testing multi-level closure
function f(x)
return function (y)
return function (z) return w+x+y+z end
end
end
y = f(10)
w = 1.345
assert(y(20)(30) == 60+w)
-- testing closures x break
do
local X, Y
local a = math.sin(0)
while a do
local b = 10
X = function () return b end -- closure with upvalue
if a then break end
end
do
local b = 20
Y = function () return b end -- closure with upvalue
end
-- upvalues must be different
assert(X() == 10 and Y() == 20)
end
-- testing closures x repeat-until
local a = {}
local i = 1
repeat
local x = i
a[i] = function () i = x+1; return x end
until i > 10 or a[i]() ~= x
assert(i == 11 and a[1]() == 1 and a[3]() == 3 and i == 4)
-- testing closures created in 'then' and 'else' parts of 'if's
a = {}
for i = 1, 10 do
if i % 3 == 0 then
local y = 0
a[i] = function (x) local t = y; y = x; return t end
elseif i % 3 == 1 then
goto L1
error'not here'
::L1::
local y = 1
a[i] = function (x) local t = y; y = x; return t end
elseif i % 3 == 2 then
local t
goto l4
::l4a:: a[i] = t; goto l4b
error("should never be here!")
::l4::
local y = 2
t = function (x) local t = y; y = x; return t end
goto l4a
error("should never be here!")
::l4b::
end
end
for i = 1, 10 do
assert(a[i](i * 10) == i % 3 and a[i]() == i * 10)
end
print'+'
-- test for correctly closing upvalues in tail calls of vararg functions
local function t ()
local function c(a,b) assert(a=="test" and b=="OK") end
local function v(f, ...) c("test", f() ~= 1 and "FAILED" or "OK") end
local x = 1
return v(function() return x end)
end
t()
-- test for debug manipulation of upvalues
local debug = require'debug'
do
local a , b, c = 3, 5, 7
foo1 = function () return a+b end;
foo2 = function () return b+a end;
do
local a = 10
foo3 = function () return a+b end;
end
end
assert(debug.upvalueid(foo1, 1))
assert(debug.upvalueid(foo1, 2))
assert(not pcall(debug.upvalueid, foo1, 3))
assert(debug.upvalueid(foo1, 1) == debug.upvalueid(foo2, 2))
assert(debug.upvalueid(foo1, 2) == debug.upvalueid(foo2, 1))
assert(debug.upvalueid(foo3, 1))
assert(debug.upvalueid(foo1, 1) ~= debug.upvalueid(foo3, 1))
assert(debug.upvalueid(foo1, 2) == debug.upvalueid(foo3, 2))
assert(debug.upvalueid(string.gmatch("x", "x"), 1) ~= nil)
assert(foo1() == 3 + 5 and foo2() == 5 + 3)
debug.upvaluejoin(foo1, 2, foo2, 2)
assert(foo1() == 3 + 3 and foo2() == 5 + 3)
assert(foo3() == 10 + 5)
debug.upvaluejoin(foo3, 2, foo2, 1)
assert(foo3() == 10 + 5)
debug.upvaluejoin(foo3, 2, foo2, 2)
assert(foo3() == 10 + 3)
assert(not pcall(debug.upvaluejoin, foo1, 3, foo2, 1))
assert(not pcall(debug.upvaluejoin, foo1, 1, foo2, 3))
assert(not pcall(debug.upvaluejoin, foo1, 0, foo2, 1))
assert(not pcall(debug.upvaluejoin, print, 1, foo2, 1))
assert(not pcall(debug.upvaluejoin, {}, 1, foo2, 1))
assert(not pcall(debug.upvaluejoin, foo1, 1, print, 1))
print'OK'
CODE¶
-- $Id: testes/code.lua $
-- See Copyright Notice in file all.lua
if T==nil then
(Message or print)('\n >>> testC not active: skipping opcode tests <<<\n')
return
end
print "testing code generation and optimizations"
-- to test constant propagation
local k0aux <const> = 0
local k0 <const> = k0aux
local k1 <const> = 1
local k3 <const> = 3
local k6 <const> = k3 + (k3 << k0)
local kFF0 <const> = 0xFF0
local k3_78 <const> = 3.78
local x, k3_78_4 <const> = 10, k3_78 / 4
assert(x == 10)
local kx <const> = "x"
local kTrue <const> = true
local kFalse <const> = false
local kNil <const> = nil
-- this code gave an error for the code checker
do
local function f (a)
for k,v,w in a do end
end
end
-- testing reuse in constant table
local function checkKlist (func, list)
local k = T.listk(func)
assert(#k == #list)
for i = 1, #k do
assert(k[i] == list[i] and math.type(k[i]) == math.type(list[i]))
end
end
local function foo ()
local a
a = k3;
a = 0; a = 0.0; a = -7 + 7
a = k3_78/4; a = k3_78_4
a = -k3_78/4; a = k3_78/4; a = -3.78/4
a = -3.79/4; a = 0.0; a = -0;
a = k3; a = 3.0; a = 3; a = 3.0
end
checkKlist(foo, {3.78/4, -3.78/4, -3.79/4})
-- testing opcodes
-- check that 'f' opcodes match '...'
function check (f, ...)
local arg = {...}
local c = T.listcode(f)
for i=1, #arg do
local opcode = string.match(c[i], "%u%w+")
-- print(arg[i], opcode)
assert(arg[i] == opcode)
end
assert(c[#arg+2] == undef)
end
-- check that 'f' opcodes match '...' and that 'f(p) == r'.
function checkR (f, p, r, ...)
local r1 = f(p)
assert(r == r1 and math.type(r) == math.type(r1))
check(f, ...)
end
-- check that 'a' and 'b' has the same opcodes
function checkequal (a, b)
a = T.listcode(a)
b = T.listcode(b)
assert(#a == #b)
for i = 1, #a do
a[i] = string.gsub(a[i], '%b()', '') -- remove line number
b[i] = string.gsub(b[i], '%b()', '') -- remove line number
assert(a[i] == b[i])
end
end
-- some basic instructions
check(function () -- function does not create upvalues
(function () end){f()}
end, 'CLOSURE', 'NEWTABLE', 'EXTRAARG', 'GETTABUP', 'CALL',
'SETLIST', 'CALL', 'RETURN0')
check(function (x) -- function creates upvalues
(function () return x end){f()}
end, 'CLOSURE', 'NEWTABLE', 'EXTRAARG', 'GETTABUP', 'CALL',
'SETLIST', 'CALL', 'RETURN')
-- sequence of LOADNILs
check(function ()
local kNil <const> = nil
local a,b,c
local d; local e;
local f,g,h;
d = nil; d=nil; b=nil; a=kNil; c=nil;
end, 'LOADNIL', 'RETURN0')
check(function ()
local a,b,c,d = 1,1,1,1
d=nil;c=nil;b=nil;a=nil
end, 'LOADI', 'LOADI', 'LOADI', 'LOADI', 'LOADNIL', 'RETURN0')
do
local a,b,c,d = 1,1,1,1
d=nil;c=nil;b=nil;a=nil
assert(a == nil and b == nil and c == nil and d == nil)
end
-- single return
check (function (a,b,c) return a end, 'RETURN1')
-- infinite loops
check(function () while kTrue do local a = -1 end end,
'LOADI', 'JMP', 'RETURN0')
check(function () while 1 do local a = -1 end end,
'LOADI', 'JMP', 'RETURN0')
check(function () repeat local x = 1 until true end,
'LOADI', 'RETURN0')
-- concat optimization
check(function (a,b,c,d) return a..b..c..d end,
'MOVE', 'MOVE', 'MOVE', 'MOVE', 'CONCAT', 'RETURN1')
-- not
check(function () return not not nil end, 'LOADFALSE', 'RETURN1')
check(function () return not not kFalse end, 'LOADFALSE', 'RETURN1')
check(function () return not not true end, 'LOADTRUE', 'RETURN1')
check(function () return not not k3 end, 'LOADTRUE', 'RETURN1')
-- direct access to locals
check(function ()
local a,b,c,d
a = b*a
c.x, a[b] = -((a + d/b - a[b]) ^ a.x), b
end,
'LOADNIL',
'MUL', 'MMBIN',
'DIV', 'MMBIN', 'ADD', 'MMBIN', 'GETTABLE', 'SUB', 'MMBIN',
'GETFIELD', 'POW', 'MMBIN', 'UNM', 'SETTABLE', 'SETFIELD', 'RETURN0')
-- direct access to constants
check(function ()
local a,b
local c = kNil
a[kx] = 3.2
a.x = b
a[b] = 'x'
end,
'LOADNIL', 'SETFIELD', 'SETFIELD', 'SETTABLE', 'RETURN0')
-- "get/set table" with numeric indices
check(function (a)
local k255 <const> = 255
a[1] = a[100]
a[k255] = a[256]
a[256] = 5
end,
'GETI', 'SETI',
'LOADI', 'GETTABLE', 'SETI',
'LOADI', 'SETTABLE', 'RETURN0')
check(function ()
local a,b
a = a - a
b = a/a
b = 5-4
end,
'LOADNIL', 'SUB', 'MMBIN', 'DIV', 'MMBIN', 'LOADI', 'RETURN0')
check(function ()
local a,b
a[kTrue] = false
end,
'LOADNIL', 'LOADTRUE', 'SETTABLE', 'RETURN0')
-- equalities
checkR(function (a) if a == 1 then return 2 end end, 1, 2,
'EQI', 'JMP', 'LOADI', 'RETURN1')
checkR(function (a) if -4.0 == a then return 2 end end, -4, 2,
'EQI', 'JMP', 'LOADI', 'RETURN1')
checkR(function (a) if a == "hi" then return 2 end end, 10, nil,
'EQK', 'JMP', 'LOADI', 'RETURN1')
checkR(function (a) if a == 10000 then return 2 end end, 1, nil,
'EQK', 'JMP', 'LOADI', 'RETURN1') -- number too large
checkR(function (a) if -10000 == a then return 2 end end, -10000, 2,
'EQK', 'JMP', 'LOADI', 'RETURN1') -- number too large
-- comparisons
checkR(function (a) if -10 <= a then return 2 end end, -10, 2,
'GEI', 'JMP', 'LOADI', 'RETURN1')
checkR(function (a) if 128.0 > a then return 2 end end, 129, nil,
'LTI', 'JMP', 'LOADI', 'RETURN1')
checkR(function (a) if -127.0 < a then return 2 end end, -127, nil,
'GTI', 'JMP', 'LOADI', 'RETURN1')
checkR(function (a) if 10 < a then return 2 end end, 11, 2,
'GTI', 'JMP', 'LOADI', 'RETURN1')
checkR(function (a) if 129 < a then return 2 end end, 130, 2,
'LOADI', 'LT', 'JMP', 'LOADI', 'RETURN1')
checkR(function (a) if a >= 23.0 then return 2 end end, 25, 2,
'GEI', 'JMP', 'LOADI', 'RETURN1')
checkR(function (a) if a >= 23.1 then return 2 end end, 0, nil,
'LOADK', 'LE', 'JMP', 'LOADI', 'RETURN1')
checkR(function (a) if a > 2300.0 then return 2 end end, 0, nil,
'LOADF', 'LT', 'JMP', 'LOADI', 'RETURN1')
-- constant folding
local function checkK (func, val)
check(func, 'LOADK', 'RETURN1')
checkKlist(func, {val})
assert(func() == val)
end
local function checkI (func, val)
check(func, 'LOADI', 'RETURN1')
checkKlist(func, {})
assert(func() == val)
end
local function checkF (func, val)
check(func, 'LOADF', 'RETURN1')
checkKlist(func, {})
assert(func() == val)
end
checkF(function () return 0.0 end, 0.0)
checkI(function () return k0 end, 0)
checkI(function () return -k0//1 end, 0)
checkK(function () return 3^-1 end, 1/3)
checkK(function () return (1 + 1)^(50 + 50) end, 2^100)
checkK(function () return (-2)^(31 - 2) end, -0x20000000 + 0.0)
checkF(function () return (-k3^0 + 5) // 3.0 end, 1.0)
checkI(function () return -k3 % 5 end, 2)
checkF(function () return -((2.0^8 + -(-1)) % 8)/2 * 4 - 3 end, -5.0)
checkF(function () return -((2^8 + -(-1)) % 8)//2 * 4 - 3 end, -7.0)
checkI(function () return 0xF0.0 | 0xCC.0 ~ 0xAA & 0xFD end, 0xF4)
checkI(function () return ~(~kFF0 | kFF0) end, 0)
checkI(function () return ~~-1024.0 end, -1024)
checkI(function () return ((100 << k6) << -4) >> 2 end, 100)
-- borders around MAXARG_sBx ((((1 << 17) - 1) >> 1) == 65535)
local a = 17; local sbx = ((1 << a) - 1) >> 1 -- avoid folding
local border <const> = 65535
checkI(function () return border end, sbx)
checkI(function () return -border end, -sbx)
checkI(function () return border + 1 end, sbx + 1)
checkK(function () return border + 2 end, sbx + 2)
checkK(function () return -(border + 1) end, -(sbx + 1))
local border <const> = 65535.0
checkF(function () return border end, sbx + 0.0)
checkF(function () return -border end, -sbx + 0.0)
checkF(function () return border + 1 end, (sbx + 1.0))
checkK(function () return border + 2 end, (sbx + 2.0))
checkK(function () return -(border + 1) end, -(sbx + 1.0))
-- immediate operands
checkR(function (x) return x + k1 end, 10, 11, 'ADDI', 'MMBINI', 'RETURN1')
checkR(function (x) return x - 127 end, 10, -117, 'ADDI', 'MMBINI', 'RETURN1')
checkR(function (x) return 128 + x end, 0.0, 128.0,
'ADDI', 'MMBINI', 'RETURN1')
checkR(function (x) return x * -127 end, -1.0, 127.0,
'MULK', 'MMBINK', 'RETURN1')
checkR(function (x) return 20 * x end, 2, 40, 'MULK', 'MMBINK', 'RETURN1')
checkR(function (x) return x ^ -2 end, 2, 0.25, 'POWK', 'MMBINK', 'RETURN1')
checkR(function (x) return x / 40 end, 40, 1.0, 'DIVK', 'MMBINK', 'RETURN1')
checkR(function (x) return x // 1 end, 10.0, 10.0,
'IDIVK', 'MMBINK', 'RETURN1')
checkR(function (x) return x % (100 - 10) end, 91, 1,
'MODK', 'MMBINK', 'RETURN1')
checkR(function (x) return k1 << x end, 3, 8, 'SHLI', 'MMBINI', 'RETURN1')
checkR(function (x) return x << 127 end, 10, 0, 'SHRI', 'MMBINI', 'RETURN1')
checkR(function (x) return x << -127 end, 10, 0, 'SHRI', 'MMBINI', 'RETURN1')
checkR(function (x) return x >> 128 end, 8, 0, 'SHRI', 'MMBINI', 'RETURN1')
checkR(function (x) return x >> -127 end, 8, 0, 'SHRI', 'MMBINI', 'RETURN1')
checkR(function (x) return x & 1 end, 9, 1, 'BANDK', 'MMBINK', 'RETURN1')
checkR(function (x) return 10 | x end, 1, 11, 'BORK', 'MMBINK', 'RETURN1')
checkR(function (x) return -10 ~ x end, -1, 9, 'BXORK', 'MMBINK', 'RETURN1')
-- K operands in arithmetic operations
checkR(function (x) return x + 0.0 end, 1, 1.0, 'ADDK', 'MMBINK', 'RETURN1')
-- check(function (x) return 128 + x end, 'ADDK', 'MMBINK', 'RETURN1')
checkR(function (x) return x * -10000 end, 2, -20000,
'MULK', 'MMBINK', 'RETURN1')
-- check(function (x) return 20 * x end, 'MULK', 'MMBINK', 'RETURN1')
checkR(function (x) return x ^ 0.5 end, 4, 2.0, 'POWK', 'MMBINK', 'RETURN1')
checkR(function (x) return x / 2.0 end, 4, 2.0, 'DIVK', 'MMBINK', 'RETURN1')
checkR(function (x) return x // 10000 end, 10000, 1,
'IDIVK', 'MMBINK', 'RETURN1')
checkR(function (x) return x % (100.0 - 10) end, 91, 1.0,
'MODK', 'MMBINK', 'RETURN1')
-- no foldings (and immediate operands)
check(function () return -0.0 end, 'LOADF', 'UNM', 'RETURN1')
check(function () return k3/0 end, 'LOADI', 'DIVK', 'MMBINK', 'RETURN1')
check(function () return 0%0 end, 'LOADI', 'MODK', 'MMBINK', 'RETURN1')
check(function () return -4//0 end, 'LOADI', 'IDIVK', 'MMBINK', 'RETURN1')
check(function (x) return x >> 2.0 end, 'LOADF', 'SHR', 'MMBIN', 'RETURN1')
check(function (x) return x << 128 end, 'LOADI', 'SHL', 'MMBIN', 'RETURN1')
check(function (x) return x & 2.0 end, 'LOADF', 'BAND', 'MMBIN', 'RETURN1')
-- basic 'for' loops
check(function () for i = -10, 10.5 do end end,
'LOADI', 'LOADK', 'LOADI', 'FORPREP', 'FORLOOP', 'RETURN0')
check(function () for i = 0xfffffff, 10.0, 1 do end end,
'LOADK', 'LOADF', 'LOADI', 'FORPREP', 'FORLOOP', 'RETURN0')
-- bug in constant folding for 5.1
check(function () return -nil end, 'LOADNIL', 'UNM', 'RETURN1')
check(function ()
local a,b,c
b[c], a = c, b
b[a], a = c, b
a, b = c, a
a = a
end,
'LOADNIL',
'MOVE', 'MOVE', 'SETTABLE',
'MOVE', 'MOVE', 'MOVE', 'SETTABLE',
'MOVE', 'MOVE', 'MOVE',
-- no code for a = a
'RETURN0')
-- x == nil , x ~= nil
-- checkequal(function (b) if (a==nil) then a=1 end; if a~=nil then a=1 end end,
-- function () if (a==9) then a=1 end; if a~=9 then a=1 end end)
-- check(function () if a==nil then a='a' end end,
-- 'GETTABUP', 'EQ', 'JMP', 'SETTABUP', 'RETURN')
do -- tests for table access in upvalues
local t
check(function () t[kx] = t.y end, 'GETTABUP', 'SETTABUP')
check(function (a) t[a()] = t[a()] end,
'MOVE', 'CALL', 'GETUPVAL', 'MOVE', 'CALL',
'GETUPVAL', 'GETTABLE', 'SETTABLE')
end
-- de morgan
checkequal(function () local a; if not (a or b) then b=a end end,
function () local a; if (not a and not b) then b=a end end)
checkequal(function (l) local a; return 0 <= a and a <= l end,
function (l) local a; return not (not(a >= 0) or not(a <= l)) end)
-- if-break optimizations
check(function (a, b)
while a do
if b then break else a = a + 1 end
end
end,
'TEST', 'JMP', 'TEST', 'JMP', 'ADDI', 'MMBINI', 'JMP', 'RETURN0')
checkequal(
function (a) while a < 10 do a = a + 1 end end,
function (a)
::loop::
if not (a < 10) then goto exit end
a = a + 1
goto loop
::exit::
end
)
checkequal(
function (a) repeat local x = a + 1; a = x until a > 0 end,
function (a)
::loop:: do
local x = a + 1
a = x
end
if not (a > 0) then goto loop end
end
)
checkequal(function () return 6 or true or nil end,
function () return k6 or kTrue or kNil end)
checkequal(function () return 6 and true or nil end,
function () return k6 and kTrue or kNil end)
do -- string constants
local k0 <const> = "00000000000000000000000000000000000000000000000000"
local function f1 ()
local k <const> = k0
return function ()
return function () return k end
end
end
local f2 = f1()
local f3 = f2()
assert(f3() == k0)
checkK(f3, k0)
-- string is not needed by other functions
assert(T.listk(f1)[1] == nil)
assert(T.listk(f2)[1] == nil)
end
print 'OK'
CONSTRUCTS¶
-- $Id: testes/constructs.lua $
-- See Copyright Notice in file all.lua
;;print "testing syntax";;
local debug = require "debug"
local function checkload (s, msg)
assert(string.find(select(2, load(s)), msg))
end
-- testing semicollons
do ;;; end
; do ; a = 3; assert(a == 3) end;
;
-- invalid operations should not raise errors when not executed
if false then a = 3 // 0; a = 0 % 0 end
-- testing priorities
assert(2^3^2 == 2^(3^2));
assert(2^3*4 == (2^3)*4);
assert(2.0^-2 == 1/4 and -2^- -2 == - - -4);
assert(not nil and 2 and not(2>3 or 3<2));
assert(-3-1-5 == 0+0-9);
assert(-2^2 == -4 and (-2)^2 == 4 and 2*2-3-1 == 0);
assert(-3%5 == 2 and -3+5 == 2)
assert(2*1+3/3 == 3 and 1+2 .. 3*1 == "33");
assert(not(2+1 > 3*1) and "a".."b" > "a");
assert(0xF0 | 0xCC ~ 0xAA & 0xFD == 0xF4)
assert(0xFD & 0xAA ~ 0xCC | 0xF0 == 0xF4)
assert(0xF0 & 0x0F + 1 == 0x10)
assert(3^4//2^3//5 == 2)
assert(-3+4*5//2^3^2//9+4%10/3 == (-3)+(((4*5)//(2^(3^2)))//9)+((4%10)/3))
assert(not ((true or false) and nil))
assert( true or false and nil)
-- old bug
assert((((1 or false) and true) or false) == true)
assert((((nil and true) or false) and true) == false)
local a,b = 1,nil;
assert(-(1 or 2) == -1 and (1 and 2)+(-1.25 or -4) == 0.75);
x = ((b or a)+1 == 2 and (10 or a)+1 == 11); assert(x);
x = (((2<3) or 1) == true and (2<3 and 4) == 4); assert(x);
x,y=1,2;
assert((x>y) and x or y == 2);
x,y=2,1;
assert((x>y) and x or y == 2);
assert(1234567890 == tonumber('1234567890') and 1234567890+1 == 1234567891)
do -- testing operators with diffent kinds of constants
-- operands to consider:
-- * fit in register
-- * constant doesn't fit in register
-- * floats with integral values
local operand = {3, 100, 5.0, -10, -5.0, 10000, -10000}
local operator = {"+", "-", "*", "/", "//", "%", "^",
"&", "|", "^", "<<", ">>",
"==", "~=", "<", ">", "<=", ">=",}
for _, op in ipairs(operator) do
local f = assert(load(string.format([[return function (x,y)
return x %s y
end]], op)))();
for _, o1 in ipairs(operand) do
for _, o2 in ipairs(operand) do
local gab = f(o1, o2)
_ENV.XX = o1
code = string.format("return XX %s %s", op, o2)
res = assert(load(code))()
assert(res == gab)
_ENV.XX = o2
local code = string.format("return (%s) %s XX", o1, op)
local res = assert(load(code))()
assert(res == gab)
code = string.format("return (%s) %s %s", o1, op, o2)
res = assert(load(code))()
assert(res == gab)
end
end
end
end
-- silly loops
repeat until 1; repeat until true;
while false do end; while nil do end;
do -- test old bug (first name could not be an `upvalue')
local a; function f(x) x={a=1}; x={x=1}; x={G=1} end
end
function f (i)
if type(i) ~= 'number' then return i,'jojo'; end;
if i > 0 then return i, f(i-1); end;
end
x = {f(3), f(5), f(10);};
assert(x[1] == 3 and x[2] == 5 and x[3] == 10 and x[4] == 9 and x[12] == 1);
assert(x[nil] == nil)
x = {f'alo', f'xixi', nil};
assert(x[1] == 'alo' and x[2] == 'xixi' and x[3] == nil);
x = {f'alo'..'xixi'};
assert(x[1] == 'aloxixi')
x = {f{}}
assert(x[2] == 'jojo' and type(x[1]) == 'table')
local f = function (i)
if i < 10 then return 'a';
elseif i < 20 then return 'b';
elseif i < 30 then return 'c';
end;
end
assert(f(3) == 'a' and f(12) == 'b' and f(26) == 'c' and f(100) == nil)
for i=1,1000 do break; end;
n=100;
i=3;
t = {};
a=nil
while not a do
a=0; for i=1,n do for i=i,1,-1 do a=a+1; t[i]=1; end; end;
end
assert(a == n*(n+1)/2 and i==3);
assert(t[1] and t[n] and not t[0] and not t[n+1])
function f(b)
local x = 1;
repeat
local a;
if b==1 then local b=1; x=10; break
elseif b==2 then x=20; break;
elseif b==3 then x=30;
else local a,b,c,d=math.sin(1); x=x+1;
end
until x>=12;
return x;
end;
assert(f(1) == 10 and f(2) == 20 and f(3) == 30 and f(4)==12)
local f = function (i)
if i < 10 then return 'a'
elseif i < 20 then return 'b'
elseif i < 30 then return 'c'
else return 8
end
end
assert(f(3) == 'a' and f(12) == 'b' and f(26) == 'c' and f(100) == 8)
local a, b = nil, 23
x = {f(100)*2+3 or a, a or b+2}
assert(x[1] == 19 and x[2] == 25)
x = {f=2+3 or a, a = b+2}
assert(x.f == 5 and x.a == 25)
a={y=1}
x = {a.y}
assert(x[1] == 1)
function f(i)
while 1 do
if i>0 then i=i-1;
else return; end;
end;
end;
function g(i)
while 1 do
if i>0 then i=i-1
else return end
end
end
f(10); g(10);
do
function f () return 1,2,3; end
local a, b, c = f();
assert(a==1 and b==2 and c==3)
a, b, c = (f());
assert(a==1 and b==nil and c==nil)
end
local a,b = 3 and f();
assert(a==1 and b==nil)
function g() f(); return; end;
assert(g() == nil)
function g() return nil or f() end
a,b = g()
assert(a==1 and b==nil)
print'+';
do -- testing constants
local prog <const> = [[local x <XXX> = 10]]
checkload(prog, "unknown attribute 'XXX'")
checkload([[local xxx <const> = 20; xxx = 10]],
":1: attempt to assign to const variable 'xxx'")
checkload([[
local xx;
local xxx <const> = 20;
local yyy;
local function foo ()
local abc = xx + yyy + xxx;
return function () return function () xxx = yyy end end
end
]], ":6: attempt to assign to const variable 'xxx'")
checkload([[
local x <close> = nil
x = io.open()
]], ":2: attempt to assign to const variable 'x'")
end
f = [[
return function ( a , b , c , d , e )
local x = a >= b or c or ( d and e ) or nil
return x
end , { a = 1 , b = 2 >= 1 , } or { 1 };
]]
f = string.gsub(f, "%s+", "\n"); -- force a SETLINE between opcodes
f,a = load(f)();
assert(a.a == 1 and a.b)
function g (a,b,c,d,e)
if not (a>=b or c or d and e or nil) then return 0; else return 1; end;
end
function h (a,b,c,d,e)
while (a>=b or c or (d and e) or nil) do return 1; end;
return 0;
end;
assert(f(2,1) == true and g(2,1) == 1 and h(2,1) == 1)
assert(f(1,2,'a') == 'a' and g(1,2,'a') == 1 and h(1,2,'a') == 1)
assert(f(1,2,'a')
~= -- force SETLINE before nil
nil, "")
assert(f(1,2,'a') == 'a' and g(1,2,'a') == 1 and h(1,2,'a') == 1)
assert(f(1,2,nil,1,'x') == 'x' and g(1,2,nil,1,'x') == 1 and
h(1,2,nil,1,'x') == 1)
assert(f(1,2,nil,nil,'x') == nil and g(1,2,nil,nil,'x') == 0 and
h(1,2,nil,nil,'x') == 0)
assert(f(1,2,nil,1,nil) == nil and g(1,2,nil,1,nil) == 0 and
h(1,2,nil,1,nil) == 0)
assert(1 and 2<3 == true and 2<3 and 'a'<'b' == true)
x = 2<3 and not 3; assert(x==false)
x = 2<1 or (2>1 and 'a'); assert(x=='a')
do
local a; if nil then a=1; else a=2; end; -- this nil comes as PUSHNIL 2
assert(a==2)
end
function F(a)
assert(debug.getinfo(1, "n").name == 'F')
return a,2,3
end
a,b = F(1)~=nil; assert(a == true and b == nil);
a,b = F(nil)==nil; assert(a == true and b == nil)
----------------------------------------------------------------
------------------------------------------------------------------
-- sometimes will be 0, sometimes will not...
_ENV.GLOB1 = math.random(0, 1)
-- basic expressions with their respective values
local basiccases = {
{"nil", nil},
{"false", false},
{"true", true},
{"10", 10},
{"(0==_ENV.GLOB1)", 0 == _ENV.GLOB1},
}
local prog
if _ENV.GLOB1 == 0 then
basiccases[2][1] = "F" -- constant false
prog = [[
local F <const> = false
if %s then IX = true end
return %s
]]
else
basiccases[4][1] = "k10" -- constant 10
prog = [[
local k10 <const> = 10
if %s then IX = true end
return %s
]]
end
print('testing short-circuit optimizations (' .. _ENV.GLOB1 .. ')')
-- operators with their respective values
local binops <const> = {
{" and ", function (a,b) if not a then return a else return b end end},
{" or ", function (a,b) if a then return a else return b end end},
}
local cases <const> = {}
-- creates all combinations of '(cases[i] op cases[n-i])' plus
-- 'not(cases[i] op cases[n-i])' (syntax + value)
local function createcases (n)
local res = {}
for i = 1, n - 1 do
for _, v1 in ipairs(cases[i]) do
for _, v2 in ipairs(cases[n - i]) do
for _, op in ipairs(binops) do
local t = {
"(" .. v1[1] .. op[1] .. v2[1] .. ")",
op[2](v1[2], v2[2])
}
res[#res + 1] = t
res[#res + 1] = {"not" .. t[1], not t[2]}
end
end
end
end
return res
end
-- do not do too many combinations for soft tests
local level = _soft and 3 or 4
cases[1] = basiccases
for i = 2, level do cases[i] = createcases(i) end
print("+")
local i = 0
for n = 1, level do
for _, v in pairs(cases[n]) do
local s = v[1]
local p = load(string.format(prog, s, s), "")
IX = false
assert(p() == v[2] and IX == not not v[2])
i = i + 1
if i % 60000 == 0 then print('+') end
end
end
------------------------------------------------------------------
-- testing some syntax errors (chosen through 'gcov')
checkload("for x do", "expected")
checkload("x:call", "expected")
print'OK'
COROUTINE¶
-- $Id: testes/coroutine.lua $
-- See Copyright Notice in file all.lua
print "testing coroutines"
local debug = require'debug'
local f
local main, ismain = coroutine.running()
assert(type(main) == "thread" and ismain)
assert(not coroutine.resume(main))
assert(not coroutine.isyieldable(main) and not coroutine.isyieldable())
assert(not pcall(coroutine.yield))
-- trivial errors
assert(not pcall(coroutine.resume, 0))
assert(not pcall(coroutine.status, 0))
-- tests for multiple yield/resume arguments
local function eqtab (t1, t2)
assert(#t1 == #t2)
for i = 1, #t1 do
local v = t1[i]
assert(t2[i] == v)
end
end
_G.x = nil -- declare x
function foo (a, ...)
local x, y = coroutine.running()
assert(x == f and y == false)
-- next call should not corrupt coroutine (but must fail,
-- as it attempts to resume the running coroutine)
assert(coroutine.resume(f) == false)
assert(coroutine.status(f) == "running")
local arg = {...}
assert(coroutine.isyieldable(x))
for i=1,#arg do
_G.x = {coroutine.yield(table.unpack(arg[i]))}
end
return table.unpack(a)
end
f = coroutine.create(foo)
assert(coroutine.isyieldable(f))
assert(type(f) == "thread" and coroutine.status(f) == "suspended")
assert(string.find(tostring(f), "thread"))
local s,a,b,c,d
s,a,b,c,d = coroutine.resume(f, {1,2,3}, {}, {1}, {'a', 'b', 'c'})
assert(coroutine.isyieldable(f))
assert(s and a == nil and coroutine.status(f) == "suspended")
s,a,b,c,d = coroutine.resume(f)
eqtab(_G.x, {})
assert(s and a == 1 and b == nil)
assert(coroutine.isyieldable(f))
s,a,b,c,d = coroutine.resume(f, 1, 2, 3)
eqtab(_G.x, {1, 2, 3})
assert(s and a == 'a' and b == 'b' and c == 'c' and d == nil)
s,a,b,c,d = coroutine.resume(f, "xuxu")
eqtab(_G.x, {"xuxu"})
assert(s and a == 1 and b == 2 and c == 3 and d == nil)
assert(coroutine.status(f) == "dead")
s, a = coroutine.resume(f, "xuxu")
assert(not s and string.find(a, "dead") and coroutine.status(f) == "dead")
-- yields in tail calls
local function foo (i) return coroutine.yield(i) end
f = coroutine.wrap(function ()
for i=1,10 do
assert(foo(i) == _G.x)
end
return 'a'
end)
for i=1,10 do _G.x = i; assert(f(i) == i) end
_G.x = 'xuxu'; assert(f('xuxu') == 'a')
-- recursive
function pf (n, i)
coroutine.yield(n)
pf(n*i, i+1)
end
f = coroutine.wrap(pf)
local s=1
for i=1,10 do
assert(f(1, 1) == s)
s = s*i
end
-- sieve
function gen (n)
return coroutine.wrap(function ()
for i=2,n do coroutine.yield(i) end
end)
end
function filter (p, g)
return coroutine.wrap(function ()
while 1 do
local n = g()
if n == nil then return end
if math.fmod(n, p) ~= 0 then coroutine.yield(n) end
end
end)
end
local x = gen(80)
local a = {}
while 1 do
local n = x()
if n == nil then break end
table.insert(a, n)
x = filter(n, x)
end
assert(#a == 22 and a[#a] == 79)
x, a = nil
-- coroutine closing
do
-- ok to close a dead coroutine
local co = coroutine.create(print)
assert(coroutine.resume(co, "testing 'coroutine.close'"))
assert(coroutine.status(co) == "dead")
assert(coroutine.close(co))
-- cannot close the running coroutine
local st, msg = pcall(coroutine.close, coroutine.running())
assert(not st and string.find(msg, "running"))
local main = coroutine.running()
-- cannot close a "normal" coroutine
;(coroutine.wrap(function ()
local st, msg = pcall(coroutine.close, main)
assert(not st and string.find(msg, "normal"))
end))()
-- to-be-closed variables in coroutines
local X
local function func2close (f)
return setmetatable({}, {__close = f})
end
co = coroutine.create(function ()
local x <close> = func2close(function (self, err)
assert(err == nil); X = false
end)
X = true
coroutine.yield()
end)
coroutine.resume(co)
assert(X)
assert(coroutine.close(co))
assert(not X and coroutine.status(co) == "dead")
-- error closing a coroutine
warn("@on")
local x = 0
co = coroutine.create(function()
local y <close> = func2close(function (self,err)
if (err ~= 111) then os.exit(false) end -- should not happen
x = 200
error("200")
end)
local x <close> = func2close(function (self, err)
assert(err == nil); error(111)
end)
coroutine.yield()
end)
coroutine.resume(co)
assert(x == 0)
-- with test library, use 'store' mode to check warnings
warn(not T and "@off" or "@store")
local st, msg = coroutine.close(co)
if not T then
warn("@on")
else -- test library
assert(string.find(_WARN, "200")); _WARN = nil
warn("@normal")
end
assert(st == false and coroutine.status(co) == "dead" and msg == 111)
assert(x == 200)
end
-- yielding across C boundaries
co = coroutine.wrap(function()
assert(not pcall(table.sort,{1,2,3}, coroutine.yield))
assert(coroutine.isyieldable())
coroutine.yield(20)
return 30
end)
assert(co() == 20)
assert(co() == 30)
local f = function (s, i) return coroutine.yield(i) end
local f1 = coroutine.wrap(function ()
return xpcall(pcall, function (...) return ... end,
function ()
local s = 0
for i in f, nil, 1 do pcall(function () s = s + i end) end
error({s})
end)
end)
f1()
for i = 1, 10 do assert(f1(i) == i) end
local r1, r2, v = f1(nil)
assert(r1 and not r2 and v[1] == (10 + 1)*10/2)
function f (a, b) a = coroutine.yield(a); error{a + b} end
function g(x) return x[1]*2 end
co = coroutine.wrap(function ()
coroutine.yield(xpcall(f, g, 10, 20))
end)
assert(co() == 10)
r, msg = co(100)
assert(not r and msg == 240)
-- unyieldable C call
do
local function f (c)
assert(not coroutine.isyieldable())
return c .. c
end
local co = coroutine.wrap(function (c)
assert(coroutine.isyieldable())
local s = string.gsub("a", ".", f)
return s
end)
assert(co() == "aa")
end
do -- testing single trace of coroutines
local X
local co = coroutine.create(function ()
coroutine.yield(10)
return 20;
end)
local trace = {}
local function dotrace (event)
trace[#trace + 1] = event
end
debug.sethook(co, dotrace, "clr")
repeat until not coroutine.resume(co)
local correcttrace = {"call", "line", "call", "return", "line", "return"}
assert(#trace == #correcttrace)
for k, v in pairs(trace) do
assert(v == correcttrace[k])
end
end
-- errors in coroutines
function foo ()
assert(debug.getinfo(1).currentline == debug.getinfo(foo).linedefined + 1)
assert(debug.getinfo(2).currentline == debug.getinfo(goo).linedefined)
coroutine.yield(3)
error(foo)
end
function goo() foo() end
x = coroutine.wrap(goo)
assert(x() == 3)
local a,b = pcall(x)
assert(not a and b == foo)
x = coroutine.create(goo)
a,b = coroutine.resume(x)
assert(a and b == 3)
a,b = coroutine.resume(x)
assert(not a and b == foo and coroutine.status(x) == "dead")
a,b = coroutine.resume(x)
assert(not a and string.find(b, "dead") and coroutine.status(x) == "dead")
-- co-routines x for loop
function all (a, n, k)
if k == 0 then coroutine.yield(a)
else
for i=1,n do
a[k] = i
all(a, n, k-1)
end
end
end
local a = 0
for t in coroutine.wrap(function () all({}, 5, 4) end) do
a = a+1
end
assert(a == 5^4)
-- access to locals of collected corroutines
local C = {}; setmetatable(C, {__mode = "kv"})
local x = coroutine.wrap (function ()
local a = 10
local function f () a = a+10; return a end
while true do
a = a+1
coroutine.yield(f)
end
end)
C[1] = x;
local f = x()
assert(f() == 21 and x()() == 32 and x() == f)
x = nil
collectgarbage()
assert(C[1] == undef)
assert(f() == 43 and f() == 53)
-- old bug: attempt to resume itself
function co_func (current_co)
assert(coroutine.running() == current_co)
assert(coroutine.resume(current_co) == false)
coroutine.yield(10, 20)
assert(coroutine.resume(current_co) == false)
coroutine.yield(23)
return 10
end
local co = coroutine.create(co_func)
local a,b,c = coroutine.resume(co, co)
assert(a == true and b == 10 and c == 20)
a,b = coroutine.resume(co, co)
assert(a == true and b == 23)
a,b = coroutine.resume(co, co)
assert(a == true and b == 10)
assert(coroutine.resume(co, co) == false)
assert(coroutine.resume(co, co) == false)
-- other old bug when attempting to resume itself
-- (trigger C-code assertions)
do
local A = coroutine.running()
local B = coroutine.create(function() return coroutine.resume(A) end)
local st, res = coroutine.resume(B)
assert(st == true and res == false)
local X = false
A = coroutine.wrap(function()
local _ <close> = setmetatable({}, {__close = function () X = true end})
return pcall(A, 1)
end)
st, res = A()
assert(not st and string.find(res, "non%-suspended") and X == true)
end
-- attempt to resume 'normal' coroutine
local co1, co2
co1 = coroutine.create(function () return co2() end)
co2 = coroutine.wrap(function ()
assert(coroutine.status(co1) == 'normal')
assert(not coroutine.resume(co1))
coroutine.yield(3)
end)
a,b = coroutine.resume(co1)
assert(a and b == 3)
assert(coroutine.status(co1) == 'dead')
-- infinite recursion of coroutines
a = function(a) coroutine.wrap(a)(a) end
assert(not pcall(a, a))
a = nil
-- access to locals of erroneous coroutines
local x = coroutine.create (function ()
local a = 10
_G.f = function () a=a+1; return a end
error('x')
end)
assert(not coroutine.resume(x))
-- overwrite previous position of local `a'
assert(not coroutine.resume(x, 1, 1, 1, 1, 1, 1, 1))
assert(_G.f() == 11)
assert(_G.f() == 12)
if not T then
(Message or print)('\n >>> testC not active: skipping yield/hook tests <<<\n')
else
print "testing yields inside hooks"
local turn
function fact (t, x)
assert(turn == t)
if x == 0 then return 1
else return x*fact(t, x-1)
end
end
local A, B = 0, 0
local x = coroutine.create(function ()
T.sethook("yield 0", "", 2)
A = fact("A", 6)
end)
local y = coroutine.create(function ()
T.sethook("yield 0", "", 3)
B = fact("B", 7)
end)
while A==0 or B==0 do -- A ~= 0 when 'x' finishes (similar for 'B','y')
if A==0 then turn = "A"; assert(T.resume(x)) end
if B==0 then turn = "B"; assert(T.resume(y)) end
-- check that traceback works correctly after yields inside hooks
debug.traceback(x)
debug.traceback(y)
end
assert(B // A == 7) -- fact(7) // fact(6)
local line = debug.getinfo(1, "l").currentline + 2 -- get line number
local function foo ()
local x = 10 --<< this line is 'line'
x = x + 10
_G.XX = x
end
-- testing yields in line hook
local co = coroutine.wrap(function ()
T.sethook("setglobal X; yield 0", "l", 0); foo(); return 10 end)
_G.XX = nil;
_G.X = nil; co(); assert(_G.X == line)
_G.X = nil; co(); assert(_G.X == line + 1)
_G.X = nil; co(); assert(_G.X == line + 2 and _G.XX == nil)
_G.X = nil; co(); assert(_G.X == line + 3 and _G.XX == 20)
assert(co() == 10)
-- testing yields in count hook
co = coroutine.wrap(function ()
T.sethook("yield 0", "", 1); foo(); return 10 end)
_G.XX = nil;
local c = 0
repeat c = c + 1; local a = co() until a == 10
assert(_G.XX == 20 and c >= 5)
co = coroutine.wrap(function ()
T.sethook("yield 0", "", 2); foo(); return 10 end)
_G.XX = nil;
local c = 0
repeat c = c + 1; local a = co() until a == 10
assert(_G.XX == 20 and c >= 5)
_G.X = nil; _G.XX = nil
do
-- testing debug library on a coroutine suspended inside a hook
-- (bug in 5.2/5.3)
c = coroutine.create(function (a, ...)
T.sethook("yield 0", "l") -- will yield on next two lines
assert(a == 10)
return ...
end)
assert(coroutine.resume(c, 1, 2, 3)) -- start coroutine
local n,v = debug.getlocal(c, 0, 1) -- check its local
assert(n == "a" and v == 1)
assert(debug.setlocal(c, 0, 1, 10)) -- test 'setlocal'
local t = debug.getinfo(c, 0) -- test 'getinfo'
assert(t.currentline == t.linedefined + 1)
assert(not debug.getinfo(c, 1)) -- no other level
assert(coroutine.resume(c)) -- run next line
v = {coroutine.resume(c)} -- finish coroutine
assert(v[1] == true and v[2] == 2 and v[3] == 3 and v[4] == undef)
assert(not coroutine.resume(c))
end
do
-- testing debug library on last function in a suspended coroutine
-- (bug in 5.2/5.3)
local c = coroutine.create(function () T.testC("yield 1", 10, 20) end)
local a, b = coroutine.resume(c)
assert(a and b == 20)
assert(debug.getinfo(c, 0).linedefined == -1)
a, b = debug.getlocal(c, 0, 2)
assert(b == 10)
end
print "testing coroutine API"
-- reusing a thread
assert(T.testC([[
newthread # create thread
pushvalue 2 # push body
pushstring 'a a a' # push argument
xmove 0 3 2 # move values to new thread
resume -1, 1 # call it first time
pushstatus
xmove 3 0 0 # move results back to stack
setglobal X # result
setglobal Y # status
pushvalue 2 # push body (to call it again)
pushstring 'b b b'
xmove 0 3 2
resume -1, 1 # call it again
pushstatus
xmove 3 0 0
return 1 # return result
]], function (...) return ... end) == 'b b b')
assert(X == 'a a a' and Y == 'OK')
-- resuming running coroutine
C = coroutine.create(function ()
return T.testC([[
pushnum 10;
pushnum 20;
resume -3 2;
pushstatus
gettop;
return 3]], C)
end)
local a, b, c, d = coroutine.resume(C)
assert(a == true and string.find(b, "non%-suspended") and
c == "ERRRUN" and d == 4)
a, b, c, d = T.testC([[
rawgeti R 1 # get main thread
pushnum 10;
pushnum 20;
resume -3 2;
pushstatus
gettop;
return 4]])
assert(a == coroutine.running() and string.find(b, "non%-suspended") and
c == "ERRRUN" and d == 4)
-- using a main thread as a coroutine
local state = T.newstate()
T.loadlib(state)
assert(T.doremote(state, [[
coroutine = require'coroutine';
X = function (x) coroutine.yield(x, 'BB'); return 'CC' end;
return 'ok']]))
t = table.pack(T.testC(state, [[
rawgeti R 1 # get main thread
pushstring 'XX'
getglobal X # get function for body
pushstring AA # arg
resume 1 1 # 'resume' shadows previous stack!
gettop
setglobal T # top
setglobal B # second yielded value
setglobal A # fist yielded value
rawgeti R 1 # get main thread
pushnum 5 # arg (noise)
resume 1 1 # after coroutine ends, previous stack is back
pushstatus
return *
]]))
assert(t.n == 4 and t[2] == 'XX' and t[3] == 'CC' and t[4] == 'OK')
assert(T.doremote(state, "return T") == '2')
assert(T.doremote(state, "return A") == 'AA')
assert(T.doremote(state, "return B") == 'BB')
T.closestate(state)
print'+'
end
-- leaving a pending coroutine open
_X = coroutine.wrap(function ()
local a = 10
local x = function () a = a+1 end
coroutine.yield()
end)
_X()
if not _soft then
-- bug (stack overflow)
local j = 2^9
local lim = 1000000 -- (C stack limit; assume 32-bit machine)
local t = {lim - 10, lim - 5, lim - 1, lim, lim + 1}
for i = 1, #t do
local j = t[i]
co = coroutine.create(function()
local t = {}
for i = 1, j do t[i] = i end
return table.unpack(t)
end)
local r, msg = coroutine.resume(co)
assert(not r)
end
co = nil
end
assert(coroutine.running() == main)
print"+"
print"testing yields inside metamethods"
local function val(x)
if type(x) == "table" then return x.x else return x end
end
local mt = {
__eq = function(a,b) coroutine.yield(nil, "eq"); return val(a) == val(b) end,
__lt = function(a,b) coroutine.yield(nil, "lt"); return val(a) < val(b) end,
__le = function(a,b) coroutine.yield(nil, "le"); return a - b <= 0 end,
__add = function(a,b) coroutine.yield(nil, "add");
return val(a) + val(b) end,
__sub = function(a,b) coroutine.yield(nil, "sub"); return val(a) - val(b) end,
__mul = function(a,b) coroutine.yield(nil, "mul"); return val(a) * val(b) end,
__div = function(a,b) coroutine.yield(nil, "div"); return val(a) / val(b) end,
__idiv = function(a,b) coroutine.yield(nil, "idiv");
return val(a) // val(b) end,
__pow = function(a,b) coroutine.yield(nil, "pow"); return val(a) ^ val(b) end,
__mod = function(a,b) coroutine.yield(nil, "mod"); return val(a) % val(b) end,
__unm = function(a,b) coroutine.yield(nil, "unm"); return -val(a) end,
__bnot = function(a,b) coroutine.yield(nil, "bnot"); return ~val(a) end,
__shl = function(a,b) coroutine.yield(nil, "shl");
return val(a) << val(b) end,
__shr = function(a,b) coroutine.yield(nil, "shr");
return val(a) >> val(b) end,
__band = function(a,b)
coroutine.yield(nil, "band")
return val(a) & val(b)
end,
__bor = function(a,b) coroutine.yield(nil, "bor");
return val(a) | val(b) end,
__bxor = function(a,b) coroutine.yield(nil, "bxor");
return val(a) ~ val(b) end,
__concat = function(a,b)
coroutine.yield(nil, "concat");
return val(a) .. val(b)
end,
__index = function (t,k) coroutine.yield(nil, "idx"); return t.k[k] end,
__newindex = function (t,k,v) coroutine.yield(nil, "nidx"); t.k[k] = v end,
}
local function new (x)
return setmetatable({x = x, k = {}}, mt)
end
local a = new(10)
local b = new(12)
local c = new"hello"
local function run (f, t)
local i = 1
local c = coroutine.wrap(f)
while true do
local res, stat = c()
if res then assert(t[i] == undef); return res, t end
assert(stat == t[i])
i = i + 1
end
end
assert(run(function () if (a>=b) then return '>=' else return '<' end end,
{"le", "sub"}) == "<")
assert(run(function () if (a<=b) then return '<=' else return '>' end end,
{"le", "sub"}) == "<=")
assert(run(function () if (a==b) then return '==' else return '~=' end end,
{"eq"}) == "~=")
assert(run(function () return a & b + a end, {"add", "band"}) == 2)
assert(run(function () return 1 + a end, {"add"}) == 11)
assert(run(function () return a - 25 end, {"sub"}) == -15)
assert(run(function () return 2 * a end, {"mul"}) == 20)
assert(run(function () return a ^ 2 end, {"pow"}) == 100)
assert(run(function () return a / 2 end, {"div"}) == 5)
assert(run(function () return a % 6 end, {"mod"}) == 4)
assert(run(function () return a // 3 end, {"idiv"}) == 3)
assert(run(function () return a + b end, {"add"}) == 22)
assert(run(function () return a - b end, {"sub"}) == -2)
assert(run(function () return a * b end, {"mul"}) == 120)
assert(run(function () return a ^ b end, {"pow"}) == 10^12)
assert(run(function () return a / b end, {"div"}) == 10/12)
assert(run(function () return a % b end, {"mod"}) == 10)
assert(run(function () return a // b end, {"idiv"}) == 0)
-- repeat tests with larger constants (to use 'K' opcodes)
local a1000 = new(1000)
assert(run(function () return a1000 + 1000 end, {"add"}) == 2000)
assert(run(function () return a1000 - 25000 end, {"sub"}) == -24000)
assert(run(function () return 2000 * a end, {"mul"}) == 20000)
assert(run(function () return a1000 / 1000 end, {"div"}) == 1)
assert(run(function () return a1000 % 600 end, {"mod"}) == 400)
assert(run(function () return a1000 // 500 end, {"idiv"}) == 2)
assert(run(function () return a % b end, {"mod"}) == 10)
assert(run(function () return ~a & b end, {"bnot", "band"}) == ~10 & 12)
assert(run(function () return a | b end, {"bor"}) == 10 | 12)
assert(run(function () return a ~ b end, {"bxor"}) == 10 ~ 12)
assert(run(function () return a << b end, {"shl"}) == 10 << 12)
assert(run(function () return a >> b end, {"shr"}) == 10 >> 12)
assert(run(function () return 10 & b end, {"band"}) == 10 & 12)
assert(run(function () return a | 2 end, {"bor"}) == 10 | 2)
assert(run(function () return a ~ 2 end, {"bxor"}) == 10 ~ 2)
assert(run(function () return a >> 2 end, {"shr"}) == 10 >> 2)
assert(run(function () return 1 >> a end, {"shr"}) == 1 >> 10)
assert(run(function () return a << 2 end, {"shl"}) == 10 << 2)
assert(run(function () return 1 << a end, {"shl"}) == 1 << 10)
assert(run(function () return 2 ~ a end, {"bxor"}) == 2 ~ 10)
assert(run(function () return a..b end, {"concat"}) == "1012")
assert(run(function() return a .. b .. c .. a end,
{"concat", "concat", "concat"}) == "1012hello10")
assert(run(function() return "a" .. "b" .. a .. "c" .. c .. b .. "x" end,
{"concat", "concat", "concat"}) == "ab10chello12x")
do -- a few more tests for comparison operators
local mt1 = {
__le = function (a,b)
coroutine.yield(10)
return (val(a) <= val(b))
end,
__lt = function (a,b)
coroutine.yield(10)
return val(a) < val(b)
end,
}
local mt2 = { __lt = mt1.__lt, __le = mt1.__le }
local function run (f)
local co = coroutine.wrap(f)
local res
repeat
res = co()
until res ~= 10
return res
end
local function test ()
local a1 = setmetatable({x=1}, mt1)
local a2 = setmetatable({x=2}, mt2)
assert(a1 < a2)
assert(a1 <= a2)
assert(1 < a2)
assert(1 <= a2)
assert(2 > a1)
assert(2 >= a2)
return true
end
run(test)
end
assert(run(function ()
a.BB = print
return a.BB
end, {"nidx", "idx"}) == print)
-- getuptable & setuptable
do local _ENV = _ENV
f = function () AAA = BBB + 1; return AAA end
end
g = new(10); g.k.BBB = 10;
debug.setupvalue(f, 1, g)
assert(run(f, {"idx", "nidx", "idx"}) == 11)
assert(g.k.AAA == 11)
print"+"
print"testing yields inside 'for' iterators"
local f = function (s, i)
if i%2 == 0 then coroutine.yield(nil, "for") end
if i < s then return i + 1 end
end
assert(run(function ()
local s = 0
for i in f, 4, 0 do s = s + i end
return s
end, {"for", "for", "for"}) == 10)
-- tests for coroutine API
if T==nil then
(Message or print)('\n >>> testC not active: skipping coroutine API tests <<<\n')
print "OK"; return
end
print('testing coroutine API')
local function apico (...)
local x = {...}
return coroutine.wrap(function ()
return T.testC(table.unpack(x))
end)
end
local a = {apico(
[[
pushstring errorcode
pcallk 1 0 2;
invalid command (should not arrive here)
]],
[[return *]],
"stackmark",
error
)()}
assert(#a == 4 and
a[3] == "stackmark" and
a[4] == "errorcode" and
_G.status == "ERRRUN" and
_G.ctx == 2) -- 'ctx' to pcallk
local co = apico(
"pushvalue 2; pushnum 10; pcallk 1 2 3; invalid command;",
coroutine.yield,
"getglobal status; getglobal ctx; pushvalue 2; pushstring a; pcallk 1 0 4; invalid command",
"getglobal status; getglobal ctx; return *")
assert(co() == 10)
assert(co(20, 30) == 'a')
a = {co()}
assert(#a == 10 and
a[2] == coroutine.yield and
a[5] == 20 and a[6] == 30 and
a[7] == "YIELD" and a[8] == 3 and
a[9] == "YIELD" and a[10] == 4)
assert(not pcall(co)) -- coroutine is dead now
f = T.makeCfunc("pushnum 3; pushnum 5; yield 1;")
co = coroutine.wrap(function ()
assert(f() == 23); assert(f() == 23); return 10
end)
assert(co(23,16) == 5)
assert(co(23,16) == 5)
assert(co(23,16) == 10)
-- testing coroutines with C bodies
f = T.makeCfunc([[
pushnum 102
yieldk 1 U2
cannot be here!
]],
[[ # continuation
pushvalue U3 # accessing upvalues inside a continuation
pushvalue U4
return *
]], 23, "huu")
x = coroutine.wrap(f)
assert(x() == 102)
eqtab({x()}, {23, "huu"})
f = T.makeCfunc[[pushstring 'a'; pushnum 102; yield 2; ]]
a, b, c, d = T.testC([[newthread; pushvalue 2; xmove 0 3 1; resume 3 0;
pushstatus; xmove 3 0 0; resume 3 0; pushstatus;
return 4; ]], f)
assert(a == 'YIELD' and b == 'a' and c == 102 and d == 'OK')
-- testing chain of suspendable C calls
local count = 3 -- number of levels
f = T.makeCfunc([[
remove 1; # remove argument
pushvalue U3; # get selection function
call 0 1; # call it (result is 'f' or 'yield')
pushstring hello # single argument for selected function
pushupvalueindex 2; # index of continuation program
callk 1 -1 .; # call selected function
errorerror # should never arrive here
]],
[[
# continuation program
pushnum 34 # return value
return * # return all results
]],
function () -- selection function
count = count - 1
if count == 0 then return coroutine.yield
else return f
end
end
)
co = coroutine.wrap(function () return f(nil) end)
assert(co() == "hello") -- argument to 'yield'
a = {co()}
-- three '34's (one from each pending C call)
assert(#a == 3 and a[1] == a[2] and a[2] == a[3] and a[3] == 34)
-- testing yields with continuations
co = coroutine.wrap(function (...) return
T.testC([[ # initial function
yieldk 1 2
cannot be here!
]],
[[ # 1st continuation
yieldk 0 3
cannot be here!
]],
[[ # 2nd continuation
yieldk 0 4
cannot be here!
]],
[[ # 3th continuation
pushvalue 6 # function which is last arg. to 'testC' here
pushnum 10; pushnum 20;
pcall 2 0 0 # call should throw an error and return to next line
pop 1 # remove error message
pushvalue 6
getglobal status; getglobal ctx
pcallk 2 2 5 # call should throw an error and jump to continuation
cannot be here!
]],
[[ # 4th (and last) continuation
return *
]],
-- function called by 3th continuation
function (a,b) x=a; y=b; error("errmsg") end,
...
)
end)
local a = {co(3,4,6)}
assert(a[1] == 6 and a[2] == undef)
a = {co()}; assert(a[1] == undef and _G.status == "YIELD" and _G.ctx == 2)
a = {co()}; assert(a[1] == undef and _G.status == "YIELD" and _G.ctx == 3)
a = {co(7,8)};
-- original arguments
assert(type(a[1]) == 'string' and type(a[2]) == 'string' and
type(a[3]) == 'string' and type(a[4]) == 'string' and
type(a[5]) == 'string' and type(a[6]) == 'function')
-- arguments left from fist resume
assert(a[7] == 3 and a[8] == 4)
-- arguments to last resume
assert(a[9] == 7 and a[10] == 8)
-- error message and nothing more
assert(a[11]:find("errmsg") and #a == 11)
-- check arguments to pcallk
assert(x == "YIELD" and y == 4)
assert(not pcall(co)) -- coroutine should be dead
-- bug in nCcalls
local co = coroutine.wrap(function ()
local a = {pcall(pcall,pcall,pcall,pcall,pcall,pcall,pcall,error,"hi")}
return pcall(assert, table.unpack(a))
end)
local a = {co()}
assert(a[10] == "hi")
print'OK'
DB¶
-- $Id: testes/db.lua $
-- See Copyright Notice in file all.lua
-- testing debug library
local debug = require "debug"
local function dostring(s) return assert(load(s))() end
print"testing debug library and debug information"
do
local a=1
end
assert(not debug.gethook())
local testline = 19 -- line where 'test' is defined
function test (s, l, p) -- this must be line 19
collectgarbage() -- avoid gc during trace
local function f (event, line)
assert(event == 'line')
local l = table.remove(l, 1)
if p then print(l, line) end
assert(l == line, "wrong trace!!")
end
debug.sethook(f,"l"); load(s)(); debug.sethook()
assert(#l == 0)
end
do
assert(not pcall(debug.getinfo, print, "X")) -- invalid option
assert(not debug.getinfo(1000)) -- out of range level
assert(not debug.getinfo(-1)) -- out of range level
local a = debug.getinfo(print)
assert(a.what == "C" and a.short_src == "[C]")
a = debug.getinfo(print, "L")
assert(a.activelines == nil)
local b = debug.getinfo(test, "SfL")
assert(b.name == nil and b.what == "Lua" and b.linedefined == testline and
b.lastlinedefined == b.linedefined + 10 and
b.func == test and not string.find(b.short_src, "%["))
assert(b.activelines[b.linedefined + 1] and
b.activelines[b.lastlinedefined])
assert(not b.activelines[b.linedefined] and
not b.activelines[b.lastlinedefined + 1])
end
-- test file and string names truncation
a = "function f () end"
local function dostring (s, x) return load(s, x)() end
dostring(a)
assert(debug.getinfo(f).short_src == string.format('[string "%s"]', a))
dostring(a..string.format("; %s\n=1", string.rep('p', 400)))
assert(string.find(debug.getinfo(f).short_src, '^%[string [^\n]*%.%.%."%]$'))
dostring(a..string.format("; %s=1", string.rep('p', 400)))
assert(string.find(debug.getinfo(f).short_src, '^%[string [^\n]*%.%.%."%]$'))
dostring("\n"..a)
assert(debug.getinfo(f).short_src == '[string "..."]')
dostring(a, "")
assert(debug.getinfo(f).short_src == '[string ""]')
dostring(a, "@xuxu")
assert(debug.getinfo(f).short_src == "xuxu")
dostring(a, "@"..string.rep('p', 1000)..'t')
assert(string.find(debug.getinfo(f).short_src, "^%.%.%.p*t$"))
dostring(a, "=xuxu")
assert(debug.getinfo(f).short_src == "xuxu")
dostring(a, string.format("=%s", string.rep('x', 500)))
assert(string.find(debug.getinfo(f).short_src, "^x*$"))
dostring(a, "=")
assert(debug.getinfo(f).short_src == "")
a = nil; f = nil;
repeat
local g = {x = function ()
local a = debug.getinfo(2)
assert(a.name == 'f' and a.namewhat == 'local')
a = debug.getinfo(1)
assert(a.name == 'x' and a.namewhat == 'field')
return 'xixi'
end}
local f = function () return 1+1 and (not 1 or g.x()) end
assert(f() == 'xixi')
g = debug.getinfo(f)
assert(g.what == "Lua" and g.func == f and g.namewhat == "" and not g.name)
function f (x, name) -- local!
name = name or 'f'
local a = debug.getinfo(1)
assert(a.name == name and a.namewhat == 'local')
return x
end
-- breaks in different conditions
if 3>4 then break end; f()
if 3<4 then a=1 else break end; f()
while 1 do local x=10; break end; f()
local b = 1
if 3>4 then return math.sin(1) end; f()
a = 3<4; f()
a = 3<4 or 1; f()
repeat local x=20; if 4>3 then f() else break end; f() until 1
g = {}
f(g).x = f(2) and f(10)+f(9)
assert(g.x == f(19))
function g(x) if not x then return 3 end return (x('a', 'x')) end
assert(g(f) == 'a')
until 1
test([[if
math.sin(1)
then
a=1
else
a=2
end
]], {2,3,4,7})
test([[--
if nil then
a=1
else
a=2
end
]], {2,5,6})
test([[a=1
repeat
a=a+1
until a==3
]], {1,3,4,3,4})
test([[ do
return
end
]], {2})
test([[local a
a=1
while a<=3 do
a=a+1
end
]], {1,2,3,4,3,4,3,4,3,5})
test([[while math.sin(1) do
if math.sin(1)
then break
end
end
a=1]], {1,2,3,6})
test([[for i=1,3 do
a=i
end
]], {1,2,1,2,1,2,1,3})
test([[for i,v in pairs{'a','b'} do
a=tostring(i) .. v
end
]], {1,2,1,2,1,3})
test([[for i=1,4 do a=1 end]], {1,1,1,1})
do -- testing line info/trace with large gaps in source
local a = {1, 2, 3, 10, 124, 125, 126, 127, 128, 129, 130,
255, 256, 257, 500, 1000}
local s = [[
local b = {10}
a = b[1] X + Y b[1]
b = 4
]]
for _, i in ipairs(a) do
local subs = {X = string.rep("\n", i)}
for _, j in ipairs(a) do
subs.Y = string.rep("\n", j)
local s = string.gsub(s, "[XY]", subs)
test(s, {1, 2 + i, 2 + i + j, 2 + i, 2 + i + j, 3 + i + j})
end
end
end
print'+'
-- invalid levels in [gs]etlocal
assert(not pcall(debug.getlocal, 20, 1))
assert(not pcall(debug.setlocal, -1, 1, 10))
-- parameter names
local function foo (a,b,...) local d, e end
local co = coroutine.create(foo)
assert(debug.getlocal(foo, 1) == 'a')
assert(debug.getlocal(foo, 2) == 'b')
assert(not debug.getlocal(foo, 3))
assert(debug.getlocal(co, foo, 1) == 'a')
assert(debug.getlocal(co, foo, 2) == 'b')
assert(not debug.getlocal(co, foo, 3))
assert(not debug.getlocal(print, 1))
local function foo () return (debug.getlocal(1, -1)) end
assert(not foo(10))
-- varargs
local function foo (a, ...)
local t = table.pack(...)
for i = 1, t.n do
local n, v = debug.getlocal(1, -i)
assert(n == "(vararg)" and v == t[i])
end
assert(not debug.getlocal(1, -(t.n + 1)))
assert(not debug.setlocal(1, -(t.n + 1), 30))
if t.n > 0 then
(function (x)
assert(debug.setlocal(2, -1, x) == "(vararg)")
assert(debug.setlocal(2, -t.n, x) == "(vararg)")
end)(430)
assert(... == 430)
end
end
foo()
foo(print)
foo(200, 3, 4)
local a = {}
for i = 1, (_soft and 100 or 1000) do a[i] = i end
foo(table.unpack(a))
a = nil
do -- test hook presence in debug info
assert(not debug.gethook())
local count = 0
local function f ()
assert(debug.getinfo(1).namewhat == "hook")
local sndline = string.match(debug.traceback(), "\n(.-)\n")
assert(string.find(sndline, "hook"))
count = count + 1
end
debug.sethook(f, "l")
local a = 0
_ENV.a = a
a = 1
debug.sethook()
assert(count == 4)
end
-- hook table has weak keys
assert(getmetatable(debug.getregistry()._HOOKKEY).__mode == 'k')
a = {}; L = nil
local glob = 1
local oldglob = glob
debug.sethook(function (e,l)
collectgarbage() -- force GC during a hook
local f, m, c = debug.gethook()
assert(m == 'crl' and c == 0)
if e == "line" then
if glob ~= oldglob then
L = l-1 -- get the first line where "glob" has changed
oldglob = glob
end
elseif e == "call" then
local f = debug.getinfo(2, "f").func
a[f] = 1
else assert(e == "return")
end
end, "crl")
function f(a,b)
collectgarbage()
local _, x = debug.getlocal(1, 1)
local _, y = debug.getlocal(1, 2)
assert(x == a and y == b)
assert(debug.setlocal(2, 3, "pera") == "AA".."AA")
assert(debug.setlocal(2, 4, "maçã") == "B")
x = debug.getinfo(2)
assert(x.func == g and x.what == "Lua" and x.name == 'g' and
x.nups == 2 and string.find(x.source, "^@.*db%.lua$"))
glob = glob+1
assert(debug.getinfo(1, "l").currentline == L+1)
assert(debug.getinfo(1, "l").currentline == L+2)
end
function foo()
glob = glob+1
assert(debug.getinfo(1, "l").currentline == L+1)
end; foo() -- set L
-- check line counting inside strings and empty lines
_ = 'alo\
alo' .. [[
]]
--[[
]]
assert(debug.getinfo(1, "l").currentline == L+11) -- check count of lines
function g (...)
local arg = {...}
do local a,b,c; a=math.sin(40); end
local feijao
local AAAA,B = "xuxu", "mamão"
f(AAAA,B)
assert(AAAA == "pera" and B == "maçã")
do
local B = 13
local x,y = debug.getlocal(1,5)
assert(x == 'B' and y == 13)
end
end
g()
assert(a[f] and a[g] and a[assert] and a[debug.getlocal] and not a[print])
-- tests for manipulating non-registered locals (C and Lua temporaries)
local n, v = debug.getlocal(0, 1)
assert(v == 0 and n == "(C temporary)")
local n, v = debug.getlocal(0, 2)
assert(v == 2 and n == "(C temporary)")
assert(not debug.getlocal(0, 3))
assert(not debug.getlocal(0, 0))
function f()
assert(select(2, debug.getlocal(2,3)) == 1)
assert(not debug.getlocal(2,4))
debug.setlocal(2, 3, 10)
return 20
end
function g(a,b) return (a+1) + f() end
assert(g(0,0) == 30)
debug.sethook(nil);
assert(not debug.gethook())
-- minimal tests for setuservalue/getuservalue
do
assert(not debug.setuservalue(io.stdin, 10))
local a, b = debug.getuservalue(io.stdin, 10)
assert(a == nil and not b)
end
-- testing iteraction between multiple values x hooks
do
local function f(...) return 3, ... end
local count = 0
local a = {}
for i = 1, 100 do a[i] = i end
debug.sethook(function () count = count + 1 end, "", 1)
local t = {table.unpack(a)}
assert(#t == 100)
t = {table.unpack(a, 1, 3)}
assert(#t == 3)
t = {f(table.unpack(a, 1, 30))}
assert(#t == 31)
end
-- testing access to function arguments
local function collectlocals (level)
local tab = {}
for i = 1, math.huge do
local n, v = debug.getlocal(level + 1, i)
if not (n and string.find(n, "^[a-zA-Z0-9_]+$")) then
break -- consider only real variables
end
tab[n] = v
end
return tab
end
X = nil
a = {}
function a:f (a, b, ...) local arg = {...}; local c = 13 end
debug.sethook(function (e)
assert(e == "call")
dostring("XX = 12") -- test dostring inside hooks
-- testing errors inside hooks
assert(not pcall(load("a='joao'+1")))
debug.sethook(function (e, l)
assert(debug.getinfo(2, "l").currentline == l)
local f,m,c = debug.gethook()
assert(e == "line")
assert(m == 'l' and c == 0)
debug.sethook(nil) -- hook is called only once
assert(not X) -- check that
X = collectlocals(2)
end, "l")
end, "c")
a:f(1,2,3,4,5)
assert(X.self == a and X.a == 1 and X.b == 2 and X.c == nil)
assert(XX == 12)
assert(not debug.gethook())
-- testing access to local variables in return hook (bug in 5.2)
do
local X = false
local function foo (a, b, ...)
do local x,y,z end
local c, d = 10, 20
return
end
local function aux ()
if debug.getinfo(2).name == "foo" then
X = true -- to signal that it found 'foo'
local tab = {a = 100, b = 200, c = 10, d = 20}
for n, v in pairs(collectlocals(2)) do
assert(tab[n] == v)
tab[n] = undef
end
assert(next(tab) == nil) -- 'tab' must be empty
end
end
debug.sethook(aux, "r"); foo(100, 200); debug.sethook()
assert(X)
end
local function eqseq (t1, t2)
assert(#t1 == #t2)
for i = 1, #t1 do
assert(t1[i] == t2[i])
end
end
do print("testing inspection of parameters/returned values")
local on = false
local inp, out
local function hook (event)
if not on then return end
local ar = debug.getinfo(2, "ruS")
local t = {}
for i = ar.ftransfer, ar.ftransfer + ar.ntransfer - 1 do
local _, v = debug.getlocal(2, i)
t[#t + 1] = v
end
if event == "return" then
out = t
else
inp = t
end
end
debug.sethook(hook, "cr")
on = true; math.sin(3); on = false
eqseq(inp, {3}); eqseq(out, {math.sin(3)})
on = true; select(2, 10, 20, 30, 40); on = false
eqseq(inp, {2, 10, 20, 30, 40}); eqseq(out, {20, 30, 40})
local function foo (a, ...) return ... end
local function foo1 () on = not on; return foo(20, 10, 0) end
foo1(); on = false
eqseq(inp, {20}); eqseq(out, {10, 0})
debug.sethook()
end
-- testing upvalue access
local function getupvalues (f)
local t = {}
local i = 1
while true do
local name, value = debug.getupvalue(f, i)
if not name then break end
assert(not t[name])
t[name] = value
i = i + 1
end
return t
end
local a,b,c = 1,2,3
local function foo1 (a) b = a; return c end
local function foo2 (x) a = x; return c+b end
assert(not debug.getupvalue(foo1, 3))
assert(not debug.getupvalue(foo1, 0))
assert(not debug.setupvalue(foo1, 3, "xuxu"))
local t = getupvalues(foo1)
assert(t.a == nil and t.b == 2 and t.c == 3)
t = getupvalues(foo2)
assert(t.a == 1 and t.b == 2 and t.c == 3)
assert(debug.setupvalue(foo1, 1, "xuxu") == "b")
assert(({debug.getupvalue(foo2, 3)})[2] == "xuxu")
-- upvalues of C functions are allways "called" "" (the empty string)
assert(debug.getupvalue(string.gmatch("x", "x"), 1) == "")
-- testing count hooks
local a=0
debug.sethook(function (e) a=a+1 end, "", 1)
a=0; for i=1,1000 do end; assert(1000 < a and a < 1012)
debug.sethook(function (e) a=a+1 end, "", 4)
a=0; for i=1,1000 do end; assert(250 < a and a < 255)
local f,m,c = debug.gethook()
assert(m == "" and c == 4)
debug.sethook(function (e) a=a+1 end, "", 4000)
a=0; for i=1,1000 do end; assert(a == 0)
do
debug.sethook(print, "", 2^24 - 1) -- count upperbound
local f,m,c = debug.gethook()
assert(({debug.gethook()})[3] == 2^24 - 1)
end
debug.sethook()
-- tests for tail calls
local function f (x)
if x then
assert(debug.getinfo(1, "S").what == "Lua")
assert(debug.getinfo(1, "t").istailcall == true)
local tail = debug.getinfo(2)
assert(tail.func == g1 and tail.istailcall == true)
assert(debug.getinfo(3, "S").what == "main")
print"+"
end
end
function g(x) return f(x) end
function g1(x) g(x) end
local function h (x) local f=g1; return f(x) end
h(true)
local b = {}
debug.sethook(function (e) table.insert(b, e) end, "cr")
h(false)
debug.sethook()
local res = {"return", -- first return (from sethook)
"call", "tail call", "call", "tail call",
"return", "return",
"call", -- last call (to sethook)
}
for i = 1, #res do assert(res[i] == table.remove(b, 1)) end
b = 0
debug.sethook(function (e)
if e == "tail call" then
b = b + 1
assert(debug.getinfo(2, "t").istailcall == true)
else
assert(debug.getinfo(2, "t").istailcall == false)
end
end, "c")
h(false)
debug.sethook()
assert(b == 2) -- two tail calls
lim = _soft and 3000 or 30000
local function foo (x)
if x==0 then
assert(debug.getinfo(2).what == "main")
local info = debug.getinfo(1)
assert(info.istailcall == true and info.func == foo)
else return foo(x-1)
end
end
foo(lim)
print"+"
-- testing local function information
co = load[[
local A = function ()
return x
end
return
]]
local a = 0
-- 'A' should be visible to debugger only after its complete definition
debug.sethook(function (e, l)
if l == 3 then a = a + 1; assert(debug.getlocal(2, 1) == "(temporary)")
elseif l == 4 then a = a + 1; assert(debug.getlocal(2, 1) == "A")
end
end, "l")
co() -- run local function definition
debug.sethook() -- turn off hook
assert(a == 2) -- ensure all two lines where hooked
-- testing traceback
assert(debug.traceback(print) == print)
assert(debug.traceback(print, 4) == print)
assert(string.find(debug.traceback("hi", 4), "^hi\n"))
assert(string.find(debug.traceback("hi"), "^hi\n"))
assert(not string.find(debug.traceback("hi"), "'debug.traceback'"))
assert(string.find(debug.traceback("hi", 0), "'debug.traceback'"))
assert(string.find(debug.traceback(), "^stack traceback:\n"))
do -- C-function names in traceback
local st, msg = (function () return pcall end)()(debug.traceback)
assert(st == true and string.find(msg, "pcall"))
end
-- testing nparams, nups e isvararg
local t = debug.getinfo(print, "u")
assert(t.isvararg == true and t.nparams == 0 and t.nups == 0)
t = debug.getinfo(function (a,b,c) end, "u")
assert(t.isvararg == false and t.nparams == 3 and t.nups == 0)
t = debug.getinfo(function (a,b,...) return t[a] end, "u")
assert(t.isvararg == true and t.nparams == 2 and t.nups == 1)
t = debug.getinfo(1) -- main
assert(t.isvararg == true and t.nparams == 0 and t.nups == 1 and
debug.getupvalue(t.func, 1) == "_ENV")
t = debug.getinfo(math.sin) -- C function
assert(t.isvararg == true and t.nparams == 0 and t.nups == 0)
t = debug.getinfo(string.gmatch("abc", "a")) -- C closure
assert(t.isvararg == true and t.nparams == 0 and t.nups > 0)
-- testing debugging of coroutines
local function checktraceback (co, p, level)
local tb = debug.traceback(co, nil, level)
local i = 0
for l in string.gmatch(tb, "[^\n]+\n?") do
assert(i == 0 or string.find(l, p[i]))
i = i+1
end
assert(p[i] == undef)
end
local function f (n)
if n > 0 then f(n-1)
else coroutine.yield() end
end
local co = coroutine.create(f)
coroutine.resume(co, 3)
checktraceback(co, {"yield", "db.lua", "db.lua", "db.lua", "db.lua"})
checktraceback(co, {"db.lua", "db.lua", "db.lua", "db.lua"}, 1)
checktraceback(co, {"db.lua", "db.lua", "db.lua"}, 2)
checktraceback(co, {"db.lua"}, 4)
checktraceback(co, {}, 40)
co = coroutine.create(function (x)
local a = 1
coroutine.yield(debug.getinfo(1, "l"))
coroutine.yield(debug.getinfo(1, "l").currentline)
return a
end)
local tr = {}
local foo = function (e, l) if l then table.insert(tr, l) end end
debug.sethook(co, foo, "lcr")
local _, l = coroutine.resume(co, 10)
local x = debug.getinfo(co, 1, "lfLS")
assert(x.currentline == l.currentline and x.activelines[x.currentline])
assert(type(x.func) == "function")
for i=x.linedefined + 1, x.lastlinedefined do
assert(x.activelines[i])
x.activelines[i] = undef
end
assert(next(x.activelines) == nil) -- no 'extra' elements
assert(not debug.getinfo(co, 2))
local a,b = debug.getlocal(co, 1, 1)
assert(a == "x" and b == 10)
a,b = debug.getlocal(co, 1, 2)
assert(a == "a" and b == 1)
debug.setlocal(co, 1, 2, "hi")
assert(debug.gethook(co) == foo)
assert(#tr == 2 and
tr[1] == l.currentline-1 and tr[2] == l.currentline)
a,b,c = pcall(coroutine.resume, co)
assert(a and b and c == l.currentline+1)
checktraceback(co, {"yield", "in function <"})
a,b = coroutine.resume(co)
assert(a and b == "hi")
assert(#tr == 4 and tr[4] == l.currentline+2)
assert(debug.gethook(co) == foo)
assert(not debug.gethook())
checktraceback(co, {})
-- check get/setlocal in coroutines
co = coroutine.create(function (x)
local a, b = coroutine.yield(x)
assert(a == 100 and b == nil)
return x
end)
a, b = coroutine.resume(co, 10)
assert(a and b == 10)
a, b = debug.getlocal(co, 1, 1)
assert(a == "x" and b == 10)
assert(not debug.getlocal(co, 1, 5))
assert(debug.setlocal(co, 1, 1, 30) == "x")
assert(not debug.setlocal(co, 1, 5, 40))
a, b = coroutine.resume(co, 100)
assert(a and b == 30)
-- check traceback of suspended (or dead with error) coroutines
function f(i)
if i == 0 then error(i)
else coroutine.yield(); f(i-1)
end
end
co = coroutine.create(function (x) f(x) end)
a, b = coroutine.resume(co, 3)
t = {"'coroutine.yield'", "'f'", "in function <"}
while coroutine.status(co) == "suspended" do
checktraceback(co, t)
a, b = coroutine.resume(co)
table.insert(t, 2, "'f'") -- one more recursive call to 'f'
end
t[1] = "'error'"
checktraceback(co, t)
-- test acessing line numbers of a coroutine from a resume inside
-- a C function (this is a known bug in Lua 5.0)
local function g(x)
coroutine.yield(x)
end
local function f (i)
debug.sethook(function () end, "l")
for j=1,1000 do
g(i+j)
end
end
local co = coroutine.wrap(f)
co(10)
pcall(co)
pcall(co)
assert(type(debug.getregistry()) == "table")
-- test tagmethod information
local a = {}
local function f (t)
local info = debug.getinfo(1);
assert(info.namewhat == "metamethod")
a.op = info.name
return info.name
end
setmetatable(a, {
__index = f; __add = f; __div = f; __mod = f; __concat = f; __pow = f;
__mul = f; __idiv = f; __unm = f; __len = f; __sub = f;
__shl = f; __shr = f; __bor = f; __bxor = f;
__eq = f; __le = f; __lt = f; __unm = f; __len = f; __band = f;
__bnot = f;
})
local b = setmetatable({}, getmetatable(a))
assert(a[3] == "index" and a^3 == "pow" and a..a == "concat")
assert(a/3 == "div" and 3%a == "mod")
assert(a+3 == "add" and 3-a == "sub" and a*3 == "mul" and
-a == "unm" and #a == "len" and a&3 == "band")
assert(a + 30000 == "add" and a - 3.0 == "sub" and a * 3.0 == "mul" and
-a == "unm" and #a == "len" and a & 3 == "band")
assert(a|3 == "bor" and 3~a == "bxor" and a<<3 == "shl" and a>>1 == "shr")
assert (a==b and a.op == "eq")
assert (a>=b and a.op == "order")
assert (a>b and a.op == "order")
assert(~a == "bnot")
do -- testing for-iterator name
local function f()
assert(debug.getinfo(1).name == "for iterator")
end
for i in f do end
end
do -- testing debug info for finalizers
local name = nil
-- create a piece of garbage with a finalizer
setmetatable({}, {__gc = function ()
local t = debug.getinfo(2) -- get callee information
assert(t.namewhat == "metamethod")
name = t.name
end})
-- repeat until previous finalizer runs (setting 'name')
repeat local a = {} until name
assert(name == "__gc")
end
do
print("testing traceback sizes")
local function countlines (s)
return select(2, string.gsub(s, "\n", ""))
end
local function deep (lvl, n)
if lvl == 0 then
return (debug.traceback("message", n))
else
return (deep(lvl-1, n))
end
end
local function checkdeep (total, start)
local s = deep(total, start)
local rest = string.match(s, "^message\nstack traceback:\n(.*)$")
local cl = countlines(rest)
-- at most 10 lines in first part, 11 in second, plus '...'
assert(cl <= 10 + 11 + 1)
local brk = string.find(rest, "%.%.%.")
if brk then -- does message have '...'?
local rest1 = string.sub(rest, 1, brk)
local rest2 = string.sub(rest, brk, #rest)
assert(countlines(rest1) == 10 and countlines(rest2) == 11)
else
assert(cl == total - start + 2)
end
end
for d = 1, 51, 10 do
for l = 1, d do
-- use coroutines to ensure complete control of the stack
coroutine.wrap(checkdeep)(d, l)
end
end
end
print("testing debug functions on chunk without debug info")
prog = [[-- program to be loaded without debug information
local debug = require'debug'
local a = 12 -- a local variable
local n, v = debug.getlocal(1, 1)
assert(n == "(temporary)" and v == debug) -- unkown name but known value
n, v = debug.getlocal(1, 2)
assert(n == "(temporary)" and v == 12) -- unkown name but known value
-- a function with an upvalue
local f = function () local x; return a end
n, v = debug.getupvalue(f, 1)
assert(n == "(no name)" and v == 12)
assert(debug.setupvalue(f, 1, 13) == "(no name)")
assert(a == 13)
local t = debug.getinfo(f)
assert(t.name == nil and t.linedefined > 0 and
t.lastlinedefined == t.linedefined and
t.short_src == "?")
assert(debug.getinfo(1).currentline == -1)
t = debug.getinfo(f, "L").activelines
assert(next(t) == nil) -- active lines are empty
-- dump/load a function without debug info
f = load(string.dump(f))
t = debug.getinfo(f)
assert(t.name == nil and t.linedefined > 0 and
t.lastlinedefined == t.linedefined and
t.short_src == "?")
assert(debug.getinfo(1).currentline == -1)
return a
]]
-- load 'prog' without debug info
local f = assert(load(string.dump(load(prog), true)))
assert(f() == 13)
do -- tests for 'source' in binary dumps
local prog = [[
return function (x)
return function (y)
return x + y
end
end
]]
local name = string.rep("x", 1000)
local p = assert(load(prog, name))
-- load 'p' as a binary chunk with debug information
local c = string.dump(p)
assert(#c > 1000 and #c < 2000) -- no repetition of 'source' in dump
local f = assert(load(c))
local g = f()
local h = g(3)
assert(h(5) == 8)
assert(debug.getinfo(f).source == name and -- all functions have 'source'
debug.getinfo(g).source == name and
debug.getinfo(h).source == name)
-- again, without debug info
local c = string.dump(p, true)
assert(#c < 500) -- no 'source' in dump
local f = assert(load(c))
local g = f()
local h = g(30)
assert(h(50) == 80)
assert(debug.getinfo(f).source == '=?' and -- no function has 'source'
debug.getinfo(g).source == '=?' and
debug.getinfo(h).source == '=?')
end
print"OK"
ERRORS¶
-- $Id: testes/errors.lua $
-- See Copyright Notice in file all.lua
print("testing errors")
local debug = require"debug"
-- avoid problems with 'strict' module (which may generate other error messages)
local mt = getmetatable(_G) or {}
local oldmm = mt.__index
mt.__index = nil
local function checkerr (msg, f, ...)
local st, err = pcall(f, ...)
assert(not st and string.find(err, msg))
end
local function doit (s)
local f, msg = load(s)
if not f then return msg end
local cond, msg = pcall(f)
return (not cond) and msg
end
local function checkmessage (prog, msg)
local m = doit(prog)
assert(string.find(m, msg, 1, true))
end
local function checksyntax (prog, extra, token, line)
local msg = doit(prog)
if not string.find(token, "^<%a") and not string.find(token, "^char%(")
then token = "'"..token.."'" end
token = string.gsub(token, "(%p)", "%%%1")
local pt = string.format([[^%%[string ".*"%%]:%d: .- near %s$]],
line, token)
assert(string.find(msg, pt))
assert(string.find(msg, msg, 1, true))
end
-- test error message with no extra info
assert(doit("error('hi', 0)") == 'hi')
-- test error message with no info
assert(doit("error()") == nil)
-- test common errors/errors that crashed in the past
assert(doit("table.unpack({}, 1, n=2^30)"))
assert(doit("a=math.sin()"))
assert(not doit("tostring(1)") and doit("tostring()"))
assert(doit"tonumber()")
assert(doit"repeat until 1; a")
assert(doit"return;;")
assert(doit"assert(false)")
assert(doit"assert(nil)")
assert(doit("function a (... , ...) end"))
assert(doit("function a (, ...) end"))
assert(doit("local t={}; t = t[#t] + 1"))
checksyntax([[
local a = {4
]], "'}' expected (to close '{' at line 1)", "<eof>", 3)
if not T then
(Message or print)
('\n >>> testC not active: skipping memory message test <<<\n')
else
print "testing memory error message"
local a = {}
for i = 1, 10000 do a[i] = true end -- preallocate array
collectgarbage()
T.totalmem(T.totalmem() + 10000)
-- force a memory error (by a small margin)
local st, msg = pcall(function()
for i = 1, 100000 do a[i] = tostring(i) end
end)
T.totalmem(0)
assert(not st and msg == "not enough" .. " memory")
end
-- tests for better error messages
checkmessage("a = {} + 1", "arithmetic")
checkmessage("a = {} | 1", "bitwise operation")
checkmessage("a = {} < 1", "attempt to compare")
checkmessage("a = {} <= 1", "attempt to compare")
checkmessage("a=1; bbbb=2; a=math.sin(3)+bbbb(3)", "global 'bbbb'")
checkmessage("a={}; do local a=1 end a:bbbb(3)", "method 'bbbb'")
checkmessage("local a={}; a.bbbb(3)", "field 'bbbb'")
assert(not string.find(doit"a={13}; local bbbb=1; a[bbbb](3)", "'bbbb'"))
checkmessage("a={13}; local bbbb=1; a[bbbb](3)", "number")
checkmessage("a=(1)..{}", "a table value")
-- tail calls
checkmessage("local a={}; return a.bbbb(3)", "field 'bbbb'")
checkmessage("a={}; do local a=1 end; return a:bbbb(3)", "method 'bbbb'")
checkmessage("a = #print", "length of a function value")
checkmessage("a = #3", "length of a number value")
aaa = nil
checkmessage("aaa.bbb:ddd(9)", "global 'aaa'")
checkmessage("local aaa={bbb=1}; aaa.bbb:ddd(9)", "field 'bbb'")
checkmessage("local aaa={bbb={}}; aaa.bbb:ddd(9)", "method 'ddd'")
checkmessage("local a,b,c; (function () a = b+1.1 end)()", "upvalue 'b'")
assert(not doit"local aaa={bbb={ddd=next}}; aaa.bbb:ddd(nil)")
-- upvalues being indexed do not go to the stack
checkmessage("local a,b,cc; (function () a = cc[1] end)()", "upvalue 'cc'")
checkmessage("local a,b,cc; (function () a.x = 1 end)()", "upvalue 'a'")
checkmessage("local _ENV = {x={}}; a = a + 1", "global 'a'")
checkmessage("b=1; local aaa={}; x=aaa+b", "local 'aaa'")
checkmessage("aaa={}; x=3.3/aaa", "global 'aaa'")
checkmessage("aaa=2; b=nil;x=aaa*b", "global 'b'")
checkmessage("aaa={}; x=-aaa", "global 'aaa'")
-- short circuit
checkmessage("a=1; local a,bbbb=2,3; a = math.sin(1) and bbbb(3)",
"local 'bbbb'")
checkmessage("a=1; local a,bbbb=2,3; a = bbbb(1) or a(3)", "local 'bbbb'")
checkmessage("local a,b,c,f = 1,1,1; f((a and b) or c)", "local 'f'")
checkmessage("local a,b,c = 1,1,1; ((a and b) or c)()", "call a number value")
assert(not string.find(doit"aaa={}; x=(aaa or aaa)+(aaa and aaa)", "'aaa'"))
assert(not string.find(doit"aaa={}; (aaa or aaa)()", "'aaa'"))
checkmessage("print(print < 10)", "function with number")
checkmessage("print(print < print)", "two function values")
checkmessage("print('10' < 10)", "string with number")
checkmessage("print(10 < '23')", "number with string")
-- float->integer conversions
checkmessage("local a = 2.0^100; x = a << 2", "local a")
checkmessage("local a = 1 >> 2.0^100", "has no integer representation")
checkmessage("local a = 10.1 << 2.0^100", "has no integer representation")
checkmessage("local a = 2.0^100 & 1", "has no integer representation")
checkmessage("local a = 2.0^100 & 1e100", "has no integer representation")
checkmessage("local a = 2.0 | 1e40", "has no integer representation")
checkmessage("local a = 2e100 ~ 1", "has no integer representation")
checkmessage("string.sub('a', 2.0^100)", "has no integer representation")
checkmessage("string.rep('a', 3.3)", "has no integer representation")
checkmessage("return 6e40 & 7", "has no integer representation")
checkmessage("return 34 << 7e30", "has no integer representation")
checkmessage("return ~-3e40", "has no integer representation")
checkmessage("return ~-3.009", "has no integer representation")
checkmessage("return 3.009 & 1", "has no integer representation")
checkmessage("return 34 >> {}", "table value")
checkmessage("a = 24 // 0", "divide by zero")
checkmessage("a = 1 % 0", "'n%0'")
-- numeric for loops
checkmessage("for i = {}, 10 do end", "table")
checkmessage("for i = io.stdin, 10 do end", "FILE")
checkmessage("for i = {}, 10 do end", "initial value")
checkmessage("for i = 1, 'x', 10 do end", "string")
checkmessage("for i = 1, {}, 10 do end", "limit")
checkmessage("for i = 1, {} do end", "limit")
checkmessage("for i = 1, 10, print do end", "step")
checkmessage("for i = 1, 10, print do end", "function")
-- passing light userdata instead of full userdata
_G.D = debug
checkmessage([[
-- create light udata
local x = D.upvalueid(function () return debug end, 1)
D.setuservalue(x, {})
]], "light userdata")
_G.D = nil
do -- named objects (field '__name')
checkmessage("math.sin(io.input())", "(number expected, got FILE*)")
_G.XX = setmetatable({}, {__name = "My Type"})
assert(string.find(tostring(XX), "^My Type"))
checkmessage("io.input(XX)", "(FILE* expected, got My Type)")
checkmessage("return XX + 1", "on a My Type value")
checkmessage("return ~io.stdin", "on a FILE* value")
checkmessage("return XX < XX", "two My Type values")
checkmessage("return {} < XX", "table with My Type")
checkmessage("return XX < io.stdin", "My Type with FILE*")
_G.XX = nil
end
-- global functions
checkmessage("(io.write or print){}", "io.write")
checkmessage("(collectgarbage or print){}", "collectgarbage")
-- errors in functions without debug info
do
local f = function (a) return a + 1 end
f = assert(load(string.dump(f, true)))
assert(f(3) == 4)
checkerr("^%?:%-1:", f, {})
-- code with a move to a local var ('OP_MOV A B' with A<B)
f = function () local a; a = {}; return a + 2 end
-- no debug info (so that 'a' is unknown)
f = assert(load(string.dump(f, true)))
-- symbolic execution should not get lost
checkerr("^%?:%-1:.*table value", f)
end
-- tests for field accesses after RK limit
local t = {}
for i = 1, 1000 do
t[i] = "a = x" .. i
end
local s = table.concat(t, "; ")
t = nil
checkmessage(s.."; a = bbb + 1", "global 'bbb'")
checkmessage("local _ENV=_ENV;"..s.."; a = bbb + 1", "global 'bbb'")
checkmessage(s.."; local t = {}; a = t.bbb + 1", "field 'bbb'")
checkmessage(s.."; local t = {}; t:bbb()", "method 'bbb'")
checkmessage([[aaa=9
repeat until 3==3
local x=math.sin(math.cos(3))
if math.sin(1) == x then return math.sin(1) end -- tail call
local a,b = 1, {
{x='a'..'b'..'c', y='b', z=x},
{1,2,3,4,5} or 3+3<=3+3,
3+1>3+1,
{d = x and aaa[x or y]}}
]], "global 'aaa'")
checkmessage([[
local x,y = {},1
if math.sin(1) == 0 then return 3 end -- return
x.a()]], "field 'a'")
checkmessage([[
prefix = nil
insert = nil
while 1 do
local a
if nil then break end
insert(prefix, a)
end]], "global 'insert'")
checkmessage([[ -- tail call
return math.sin("a")
]], "'sin'")
checkmessage([[collectgarbage("nooption")]], "invalid option")
checkmessage([[x = print .. "a"]], "concatenate")
checkmessage([[x = "a" .. false]], "concatenate")
checkmessage([[x = {} .. 2]], "concatenate")
checkmessage("getmetatable(io.stdin).__gc()", "no value")
checkmessage([[
local Var
local function main()
NoSuchName (function() Var=0 end)
end
main()
]], "global 'NoSuchName'")
print'+'
a = {}; setmetatable(a, {__index = string})
checkmessage("a:sub()", "bad self")
checkmessage("string.sub('a', {})", "#2")
checkmessage("('a'):sub{}", "#1")
checkmessage("table.sort({1,2,3}, table.sort)", "'table.sort'")
checkmessage("string.gsub('s', 's', setmetatable)", "'setmetatable'")
-- tests for errors in coroutines
local function f (n)
local c = coroutine.create(f)
local a,b = coroutine.resume(c)
return b
end
assert(string.find(f(), "C stack overflow"))
checkmessage("coroutine.yield()", "outside a coroutine")
f = coroutine.wrap(function () table.sort({1,2,3}, coroutine.yield) end)
checkerr("yield across", f)
-- testing size of 'source' info; size of buffer for that info is
-- LUA_IDSIZE, declared as 60 in luaconf. Get one position for '\0'.
idsize = 60 - 1
local function checksize (source)
-- syntax error
local _, msg = load("x", source)
msg = string.match(msg, "^([^:]*):") -- get source (1st part before ':')
assert(msg:len() <= idsize)
end
for i = 60 - 10, 60 + 10 do -- check border cases around 60
checksize("@" .. string.rep("x", i)) -- file names
checksize(string.rep("x", i - 10)) -- string sources
checksize("=" .. string.rep("x", i)) -- exact sources
end
-- testing line error
local function lineerror (s, l)
local err,msg = pcall(load(s))
local line = tonumber(string.match(msg, ":(%d+):"))
assert(line == l or (not line and not l))
end
lineerror("local a\n for i=1,'a' do \n print(i) \n end", 2)
lineerror("\n local a \n for k,v in 3 \n do \n print(k) \n end", 3)
lineerror("\n\n for k,v in \n 3 \n do \n print(k) \n end", 4)
lineerror("function a.x.y ()\na=a+1\nend", 1)
lineerror("a = \na\n+\n{}", 3)
lineerror("a = \n3\n+\n(\n4\n/\nprint)", 6)
lineerror("a = \nprint\n+\n(\n4\n/\n7)", 3)
lineerror("a\n=\n-\n\nprint\n;", 3)
lineerror([[
a
(
23)
]], 1)
lineerror([[
local a = {x = 13}
a
.
x
(
23
)
]], 2)
lineerror([[
local a = {x = 13}
a
.
x
(
23 + a
)
]], 6)
local p = [[
function g() f() end
function f(x) error('a', X) end
g()
]]
X=3;lineerror((p), 3)
X=0;lineerror((p), false)
X=1;lineerror((p), 2)
X=2;lineerror((p), 1)
lineerror([[
local b = false
if not b then
error 'test'
end]], 3)
lineerror([[
local b = false
if not b then
if not b then
if not b then
error 'test'
end
end
end]], 5)
if not _soft then
-- several tests that exaust the Lua stack
collectgarbage()
print"testing stack overflow"
C = 0
local l = debug.getinfo(1, "l").currentline; function y () C=C+1; y() end
local function checkstackmessage (m)
return (string.find(m, "stack overflow"))
end
-- repeated stack overflows (to check stack recovery)
assert(checkstackmessage(doit('y()')))
print('+')
assert(checkstackmessage(doit('y()')))
print('+')
assert(checkstackmessage(doit('y()')))
print('+')
-- error lines in stack overflow
C = 0
local l1
local function g(x)
l1 = debug.getinfo(x, "l").currentline; y()
end
local _, stackmsg = xpcall(g, debug.traceback, 1)
print('+')
local stack = {}
for line in string.gmatch(stackmsg, "[^\n]*") do
local curr = string.match(line, ":(%d+):")
if curr then table.insert(stack, tonumber(curr)) end
end
local i=1
while stack[i] ~= l1 do
assert(stack[i] == l)
i = i+1
end
assert(i > 15)
-- error in error handling
local res, msg = xpcall(error, error)
assert(not res and type(msg) == 'string')
print('+')
local function f (x)
if x==0 then error('a\n')
else
local aux = function () return f(x-1) end
local a,b = xpcall(aux, aux)
return a,b
end
end
f(3)
local function loop (x,y,z) return 1 + loop(x, y, z) end
local res, msg = xpcall(loop, function (m)
assert(string.find(m, "stack overflow"))
checkerr("error handling", loop)
assert(math.sin(0) == 0)
return 15
end)
assert(msg == 15)
local f = function ()
for i = 999900, 1000000, 1 do table.unpack({}, 1, i) end
end
checkerr("too many results", f)
end
do
-- non string messages
local t = {}
local res, msg = pcall(function () error(t) end)
assert(not res and msg == t)
res, msg = pcall(function () error(nil) end)
assert(not res and msg == nil)
local function f() error{msg='x'} end
res, msg = xpcall(f, function (r) return {msg=r.msg..'y'} end)
assert(msg.msg == 'xy')
-- 'assert' with extra arguments
res, msg = pcall(assert, false, "X", t)
assert(not res and msg == "X")
-- 'assert' with no message
res, msg = pcall(function () assert(false) end)
local line = string.match(msg, "%w+%.lua:(%d+): assertion failed!$")
assert(tonumber(line) == debug.getinfo(1, "l").currentline - 2)
-- 'assert' with non-string messages
res, msg = pcall(assert, false, t)
assert(not res and msg == t)
res, msg = pcall(assert, nil, nil)
assert(not res and msg == nil)
-- 'assert' without arguments
res, msg = pcall(assert)
assert(not res and string.find(msg, "value expected"))
end
-- xpcall with arguments
a, b, c = xpcall(string.find, error, "alo", "al")
assert(a and b == 1 and c == 2)
a, b, c = xpcall(string.find, function (x) return {} end, true, "al")
assert(not a and type(b) == "table" and c == nil)
print("testing tokens in error messages")
checksyntax("syntax error", "", "error", 1)
checksyntax("1.000", "", "1.000", 1)
checksyntax("[[a]]", "", "[[a]]", 1)
checksyntax("'aa'", "", "'aa'", 1)
checksyntax("while << do end", "", "<<", 1)
checksyntax("for >> do end", "", ">>", 1)
-- test invalid non-printable char in a chunk
checksyntax("a\1a = 1", "", "<\\1>", 1)
-- test 255 as first char in a chunk
checksyntax("\255a = 1", "", "<\\255>", 1)
doit('I = load("a=9+"); a=3')
assert(a==3 and not I)
print('+')
lim = 1000
if _soft then lim = 100 end
for i=1,lim do
doit('a = ')
doit('a = 4+nil')
end
-- testing syntax limits
local function testrep (init, rep, close, repc, finalresult)
local s = init .. string.rep(rep, 100) .. close .. string.rep(repc, 100)
local res, msg = load(s)
assert(res) -- 100 levels is OK
if (finalresult) then
assert(res() == finalresult)
end
s = init .. string.rep(rep, 10000)
local res, msg = load(s) -- 10000 levels not ok
assert(not res and (string.find(msg, "too many registers") or
string.find(msg, "stack overflow")))
end
testrep("local a; a", ",a", "= 1", ",1") -- multiple assignment
testrep("local a; a=", "{", "0", "}")
testrep("return ", "(", "2", ")", 2)
testrep("local function a (x) return x end; return ", "a(", "2.2", ")", 2.2)
testrep("", "do ", "", " end")
testrep("", "while a do ", "", " end")
testrep("local a; ", "if a then else ", "", " end")
testrep("", "function foo () ", "", " end")
testrep("local a = ''; return ", "a..", "'a'", "", "a")
testrep("local a = 1; return ", "a^", "a", "", 1)
checkmessage("a = f(x" .. string.rep(",x", 260) .. ")", "too many registers")
-- testing other limits
-- upvalues
local lim = 127
local s = "local function fooA ()\n local "
for j = 1,lim do
s = s.."a"..j..", "
end
s = s.."b,c\n"
s = s.."local function fooB ()\n local "
for j = 1,lim do
s = s.."b"..j..", "
end
s = s.."b\n"
s = s.."function fooC () return b+c"
local c = 1+2
for j = 1,lim do
s = s.."+a"..j.."+b"..j
c = c + 2
end
s = s.."\nend end end"
local a,b = load(s)
assert(c > 255 and string.find(b, "too many upvalues") and
string.find(b, "line 5"))
-- local variables
s = "\nfunction foo ()\n local "
for j = 1,300 do
s = s.."a"..j..", "
end
s = s.."b\n"
local a,b = load(s)
assert(string.find(b, "line 2") and string.find(b, "too many local variables"))
mt.__index = oldmm
print('OK')
EVENTS¶
-- $Id: testes/events.lua $
-- See Copyright Notice in file all.lua
print('testing metatables')
local debug = require'debug'
X = 20; B = 30
_ENV = setmetatable({}, {__index=_G})
collectgarbage()
X = X+10
assert(X == 30 and _G.X == 20)
B = false
assert(B == false)
_ENV["B"] = undef
assert(B == 30)
assert(getmetatable{} == nil)
assert(getmetatable(4) == nil)
assert(getmetatable(nil) == nil)
a={name = "NAME"}; setmetatable(a, {__metatable = "xuxu",
__tostring=function(x) return x.name end})
assert(getmetatable(a) == "xuxu")
assert(tostring(a) == "NAME")
-- cannot change a protected metatable
assert(pcall(setmetatable, a, {}) == false)
a.name = "gororoba"
assert(tostring(a) == "gororoba")
local a, t = {10,20,30; x="10", y="20"}, {}
assert(setmetatable(a,t) == a)
assert(getmetatable(a) == t)
assert(setmetatable(a,nil) == a)
assert(getmetatable(a) == nil)
assert(setmetatable(a,t) == a)
function f (t, i, e)
assert(not e)
local p = rawget(t, "parent")
return (p and p[i]+3), "dummy return"
end
t.__index = f
a.parent = {z=25, x=12, [4] = 24}
assert(a[1] == 10 and a.z == 28 and a[4] == 27 and a.x == "10")
collectgarbage()
a = setmetatable({}, t)
function f(t, i, v) rawset(t, i, v-3) end
setmetatable(t, t) -- causes a bug in 5.1 !
t.__newindex = f
a[1] = 30; a.x = "101"; a[5] = 200
assert(a[1] == 27 and a.x == 98 and a[5] == 197)
do -- bug in Lua 5.3.2
local mt = {}
mt.__newindex = mt
local t = setmetatable({}, mt)
t[1] = 10 -- will segfault on some machines
assert(mt[1] == 10)
end
local c = {}
a = setmetatable({}, t)
t.__newindex = c
t.__index = c
a[1] = 10; a[2] = 20; a[3] = 90;
for i = 4, 20 do a[i] = i * 10 end
assert(a[1] == 10 and a[2] == 20 and a[3] == 90)
for i = 4, 20 do assert(a[i] == i * 10) end
assert(next(a) == nil)
do
local a;
a = setmetatable({}, {__index = setmetatable({},
{__index = setmetatable({},
{__index = function (_,n) return a[n-3]+4, "lixo" end})})})
a[0] = 20
for i=0,10 do
assert(a[i*3] == 20 + i*4)
end
end
do -- newindex
local foi
local a = {}
for i=1,10 do a[i] = 0; a['a'..i] = 0; end
setmetatable(a, {__newindex = function (t,k,v) foi=true; rawset(t,k,v) end})
foi = false; a[1]=0; assert(not foi)
foi = false; a['a1']=0; assert(not foi)
foi = false; a['a11']=0; assert(foi)
foi = false; a[11]=0; assert(foi)
foi = false; a[1]=undef; assert(not foi)
a[1] = undef
foi = false; a[1]=nil; assert(foi)
end
setmetatable(t, nil)
function f (t, ...) return t, {...} end
t.__call = f
do
local x,y = a(table.unpack{'a', 1})
assert(x==a and y[1]=='a' and y[2]==1 and y[3]==undef)
x,y = a()
assert(x==a and y[1]==undef)
end
local b = setmetatable({}, t)
setmetatable(b,t)
function f(op)
return function (...) cap = {[0] = op, ...} ; return (...) end
end
t.__add = f("add")
t.__sub = f("sub")
t.__mul = f("mul")
t.__div = f("div")
t.__idiv = f("idiv")
t.__mod = f("mod")
t.__unm = f("unm")
t.__pow = f("pow")
t.__len = f("len")
t.__band = f("band")
t.__bor = f("bor")
t.__bxor = f("bxor")
t.__shl = f("shl")
t.__shr = f("shr")
t.__bnot = f("bnot")
t.__lt = f("lt")
t.__le = f("le")
local function checkcap (t)
assert(#cap + 1 == #t)
for i = 1, #t do
assert(cap[i - 1] == t[i])
assert(math.type(cap[i - 1]) == math.type(t[i]))
end
end
-- Some tests are done inside small anonymous functions to ensure
-- that constants go to constant table even in debug compilation,
-- when the constant table is very small.
assert(b+5 == b); checkcap{"add", b, 5}
assert(5.2 + b == 5.2); checkcap{"add", 5.2, b}
assert(b+'5' == b); checkcap{"add", b, '5'}
assert(5+b == 5); checkcap{"add", 5, b}
assert('5'+b == '5'); checkcap{"add", '5', b}
b=b-3; assert(getmetatable(b) == t); checkcap{"sub", b, 3}
assert(5-a == 5); checkcap{"sub", 5, a}
assert('5'-a == '5'); checkcap{"sub", '5', a}
assert(a*a == a); checkcap{"mul", a, a}
assert(a/0 == a); checkcap{"div", a, 0}
assert(a/0.0 == a); checkcap{"div", a, 0.0}
assert(a%2 == a); checkcap{"mod", a, 2}
assert(a // (1/0) == a); checkcap{"idiv", a, 1/0}
;(function () assert(a & "hi" == a) end)(); checkcap{"band", a, "hi"}
;(function () assert(10 & a == 10) end)(); checkcap{"band", 10, a}
;(function () assert(a | 10 == a) end)(); checkcap{"bor", a, 10}
assert(a | "hi" == a); checkcap{"bor", a, "hi"}
assert("hi" ~ a == "hi"); checkcap{"bxor", "hi", a}
;(function () assert(10 ~ a == 10) end)(); checkcap{"bxor", 10, a}
assert(-a == a); checkcap{"unm", a, a}
assert(a^4.0 == a); checkcap{"pow", a, 4.0}
assert(a^'4' == a); checkcap{"pow", a, '4'}
assert(4^a == 4); checkcap{"pow", 4, a}
assert('4'^a == '4'); checkcap{"pow", '4', a}
assert(#a == a); checkcap{"len", a, a}
assert(~a == a); checkcap{"bnot", a, a}
assert(a << 3 == a); checkcap{"shl", a, 3}
assert(1.5 >> a == 1.5); checkcap{"shr", 1.5, a}
-- for comparison operators, all results are true
assert(5.0 > a); checkcap{"lt", a, 5.0}
assert(a >= 10); checkcap{"le", 10, a}
assert(a <= -10.0); checkcap{"le", a, -10.0}
assert(a < -10); checkcap{"lt", a, -10}
-- test for rawlen
t = setmetatable({1,2,3}, {__len = function () return 10 end})
assert(#t == 10 and rawlen(t) == 3)
assert(rawlen"abc" == 3)
assert(not pcall(rawlen, io.stdin))
assert(not pcall(rawlen, 34))
assert(not pcall(rawlen))
-- rawlen for long strings
assert(rawlen(string.rep('a', 1000)) == 1000)
t = {}
t.__lt = function (a,b,c)
collectgarbage()
assert(c == nil)
if type(a) == 'table' then a = a.x end
if type(b) == 'table' then b = b.x end
return a<b, "dummy"
end
t.__le = function (a,b,c)
assert(c == nil)
if type(a) == 'table' then a = a.x end
if type(b) == 'table' then b = b.x end
return a<=b, "dummy"
end
t.__eq = function (a,b,c)
assert(c == nil)
if type(a) == 'table' then a = a.x end
if type(b) == 'table' then b = b.x end
return a == b, "dummy"
end
function Op(x) return setmetatable({x=x}, t) end
local function test (a, b, c)
assert(not(Op(1)<Op(1)) and (Op(1)<Op(2)) and not(Op(2)<Op(1)))
assert(not(1 < Op(1)) and (Op(1) < 2) and not(2 < Op(1)))
assert(not(Op('a')<Op('a')) and (Op('a')<Op('b')) and not(Op('b')<Op('a')))
assert(not('a' < Op('a')) and (Op('a') < 'b') and not(Op('b') < Op('a')))
assert((Op(1)<=Op(1)) and (Op(1)<=Op(2)) and not(Op(2)<=Op(1)))
assert((Op('a')<=Op('a')) and (Op('a')<=Op('b')) and not(Op('b')<=Op('a')))
assert(not(Op(1)>Op(1)) and not(Op(1)>Op(2)) and (Op(2)>Op(1)))
assert(not(Op('a')>Op('a')) and not(Op('a')>Op('b')) and (Op('b')>Op('a')))
assert((Op(1)>=Op(1)) and not(Op(1)>=Op(2)) and (Op(2)>=Op(1)))
assert((1 >= Op(1)) and not(1 >= Op(2)) and (Op(2) >= 1))
assert((Op('a')>=Op('a')) and not(Op('a')>=Op('b')) and (Op('b')>=Op('a')))
assert(('a' >= Op('a')) and not(Op('a') >= 'b') and (Op('b') >= Op('a')))
assert(Op(1) == Op(1) and Op(1) ~= Op(2))
assert(Op('a') == Op('a') and Op('a') ~= Op('b'))
assert(a == a and a ~= b)
assert(Op(3) == c)
end
test(Op(1), Op(2), Op(3))
-- test `partial order'
local function rawSet(x)
local y = {}
for _,k in pairs(x) do y[k] = 1 end
return y
end
local function Set(x)
return setmetatable(rawSet(x), t)
end
t.__lt = function (a,b)
for k in pairs(a) do
if not b[k] then return false end
b[k] = undef
end
return next(b) ~= nil
end
t.__le = function (a,b)
for k in pairs(a) do
if not b[k] then return false end
end
return true
end
assert(Set{1,2,3} < Set{1,2,3,4})
assert(not(Set{1,2,3,4} < Set{1,2,3,4}))
assert((Set{1,2,3,4} <= Set{1,2,3,4}))
assert((Set{1,2,3,4} >= Set{1,2,3,4}))
assert(not (Set{1,3} <= Set{3,5}))
assert(not(Set{1,3} <= Set{3,5}))
assert(not(Set{1,3} >= Set{3,5}))
t.__eq = function (a,b)
for k in pairs(a) do
if not b[k] then return false end
b[k] = undef
end
return next(b) == nil
end
local s = Set{1,3,5}
assert(s == Set{3,5,1})
assert(not rawequal(s, Set{3,5,1}))
assert(rawequal(s, s))
assert(Set{1,3,5,1} == rawSet{3,5,1})
assert(rawSet{1,3,5,1} == Set{3,5,1})
assert(Set{1,3,5} ~= Set{3,5,1,6})
-- '__eq' is not used for table accesses
t[Set{1,3,5}] = 1
assert(t[Set{1,3,5}] == undef)
if not T then
(Message or print)('\n >>> testC not active: skipping tests for \z
userdata <<<\n')
else
local u1 = T.newuserdata(0, 1)
local u2 = T.newuserdata(0, 1)
local u3 = T.newuserdata(0, 1)
assert(u1 ~= u2 and u1 ~= u3)
debug.setuservalue(u1, 1);
debug.setuservalue(u2, 2);
debug.setuservalue(u3, 1);
debug.setmetatable(u1, {__eq = function (a, b)
return debug.getuservalue(a) == debug.getuservalue(b)
end})
debug.setmetatable(u2, {__eq = function (a, b)
return true
end})
assert(u1 == u3 and u3 == u1 and u1 ~= u2)
assert(u2 == u1 and u2 == u3 and u3 == u2)
assert(u2 ~= {}) -- different types cannot be equal
assert(rawequal(u1, u1) and not rawequal(u1, u3))
local mirror = {}
debug.setmetatable(u3, {__index = mirror, __newindex = mirror})
for i = 1, 10 do u3[i] = i end
for i = 1, 10 do assert(u3[i] == i) end
end
t.__concat = function (a,b,c)
assert(c == nil)
if type(a) == 'table' then a = a.val end
if type(b) == 'table' then b = b.val end
if A then return a..b
else
return setmetatable({val=a..b}, t)
end
end
c = {val="c"}; setmetatable(c, t)
d = {val="d"}; setmetatable(d, t)
A = true
assert(c..d == 'cd')
assert(0 .."a".."b"..c..d.."e".."f"..(5+3).."g" == "0abcdef8g")
A = false
assert((c..d..c..d).val == 'cdcd')
x = c..d
assert(getmetatable(x) == t and x.val == 'cd')
x = 0 .."a".."b"..c..d.."e".."f".."g"
assert(x.val == "0abcdefg")
-- concat metamethod x numbers (bug in 5.1.1)
c = {}
local x
setmetatable(c, {__concat = function (a,b)
assert(type(a) == "number" and b == c or type(b) == "number" and a == c)
return c
end})
assert(c..5 == c and 5 .. c == c)
assert(4 .. c .. 5 == c and 4 .. 5 .. 6 .. 7 .. c == c)
-- test comparison compatibilities
local t1, t2, c, d
t1 = {}; c = {}; setmetatable(c, t1)
d = {}
t1.__eq = function () return true end
t1.__lt = function () return true end
t1.__le = function () return false end
setmetatable(d, t1)
assert(c == d and c < d and not(d <= c))
t2 = {}
t2.__eq = t1.__eq
t2.__lt = t1.__lt
setmetatable(d, t2)
assert(c == d and c < d and not(d <= c))
-- test for several levels of calls
local i
local tt = {
__call = function (t, ...)
i = i+1
if t.f then return t.f(...)
else return {...}
end
end
}
local a = setmetatable({}, tt)
local b = setmetatable({f=a}, tt)
local c = setmetatable({f=b}, tt)
i = 0
x = c(3,4,5)
assert(i == 3 and x[1] == 3 and x[3] == 5)
assert(_G.X == 20)
print'+'
local _g = _G
_ENV = setmetatable({}, {__index=function (_,k) return _g[k] end})
a = {}
rawset(a, "x", 1, 2, 3)
assert(a.x == 1 and rawget(a, "x", 3) == 1)
print '+'
-- testing metatables for basic types
mt = {__index = function (a,b) return a+b end,
__len = function (x) return math.floor(x) end}
debug.setmetatable(10, mt)
assert(getmetatable(-2) == mt)
assert((10)[3] == 13)
assert((10)["3"] == 13)
assert(#3.45 == 3)
debug.setmetatable(23, nil)
assert(getmetatable(-2) == nil)
debug.setmetatable(true, mt)
assert(getmetatable(false) == mt)
mt.__index = function (a,b) return a or b end
assert((true)[false] == true)
assert((false)[false] == false)
debug.setmetatable(false, nil)
assert(getmetatable(true) == nil)
debug.setmetatable(nil, mt)
assert(getmetatable(nil) == mt)
mt.__add = function (a,b) return (a or 1) + (b or 2) end
assert(10 + nil == 12)
assert(nil + 23 == 24)
assert(nil + nil == 3)
debug.setmetatable(nil, nil)
assert(getmetatable(nil) == nil)
debug.setmetatable(nil, {})
-- loops in delegation
a = {}; setmetatable(a, a); a.__index = a; a.__newindex = a
assert(not pcall(function (a,b) return a[b] end, a, 10))
assert(not pcall(function (a,b,c) a[b] = c end, a, 10, true))
-- bug in 5.1
T, K, V = nil
grandparent = {}
grandparent.__newindex = function(t,k,v) T=t; K=k; V=v end
parent = {}
parent.__newindex = parent
setmetatable(parent, grandparent)
child = setmetatable({}, parent)
child.foo = 10 --> CRASH (on some machines)
assert(T == parent and K == "foo" and V == 10)
print 'OK'
return 12
FILES¶
-- $Id: testes/files.lua $
-- See Copyright Notice in file all.lua
local debug = require "debug"
local maxint = math.maxinteger
assert(type(os.getenv"PATH") == "string")
assert(io.input(io.stdin) == io.stdin)
assert(not pcall(io.input, "non-existent-file"))
assert(io.output(io.stdout) == io.stdout)
local function testerr (msg, f, ...)
local stat, err = pcall(f, ...)
return (not stat and string.find(err, msg, 1, true))
end
local function checkerr (msg, f, ...)
assert(testerr(msg, f, ...))
end
-- cannot close standard files
assert(not io.close(io.stdin) and
not io.stdout:close() and
not io.stderr:close())
-- cannot call close method without an argument (new in 5.3.5)
checkerr("got no value", io.stdin.close)
assert(type(io.input()) == "userdata" and io.type(io.output()) == "file")
assert(type(io.stdin) == "userdata" and io.type(io.stderr) == "file")
assert(not io.type(8))
local a = {}; setmetatable(a, {})
assert(not io.type(a))
assert(getmetatable(io.input()).__name == "FILE*")
local a,b,c = io.open('xuxu_nao_existe')
assert(not a and type(b) == "string" and type(c) == "number")
a,b,c = io.open('/a/b/c/d', 'w')
assert(not a and type(b) == "string" and type(c) == "number")
local file = os.tmpname()
local f, msg = io.open(file, "w")
if not f then
(Message or print)("'os.tmpname' file cannot be open; skipping file tests")
else --{ most tests here need tmpname
f:close()
print('testing i/o')
local otherfile = os.tmpname()
checkerr("invalid mode", io.open, file, "rw")
checkerr("invalid mode", io.open, file, "rb+")
checkerr("invalid mode", io.open, file, "r+bk")
checkerr("invalid mode", io.open, file, "")
checkerr("invalid mode", io.open, file, "+")
checkerr("invalid mode", io.open, file, "b")
assert(io.open(file, "r+b")):close()
assert(io.open(file, "r+")):close()
assert(io.open(file, "rb")):close()
assert(os.setlocale('C', 'all'))
io.input(io.stdin); io.output(io.stdout);
os.remove(file)
assert(not loadfile(file))
checkerr("", dofile, file)
assert(not io.open(file))
io.output(file)
assert(io.output() ~= io.stdout)
if not _port then -- invalid seek
local status, msg, code = io.stdin:seek("set", 1000)
assert(not status and type(msg) == "string" and type(code) == "number")
end
assert(io.output():seek() == 0)
assert(io.write("alo alo"):seek() == string.len("alo alo"))
assert(io.output():seek("cur", -3) == string.len("alo alo")-3)
assert(io.write("joao"))
assert(io.output():seek("end") == string.len("alo joao"))
assert(io.output():seek("set") == 0)
assert(io.write('"álo"', "{a}\n", "second line\n", "third line \n"))
assert(io.write('çfourth_line'))
io.output(io.stdout)
collectgarbage() -- file should be closed by GC
assert(io.input() == io.stdin and rawequal(io.output(), io.stdout))
print('+')
-- test GC for files
collectgarbage()
for i=1,120 do
for i=1,5 do
io.input(file)
assert(io.open(file, 'r'))
io.lines(file)
end
collectgarbage()
end
io.input():close()
io.close()
assert(os.rename(file, otherfile))
assert(not os.rename(file, otherfile))
io.output(io.open(otherfile, "ab"))
assert(io.write("\n\n\t\t ", 3450, "\n"));
io.close()
do
-- closing file by scope
local F = nil
do
local f <close> = assert(io.open(file, "w"))
F = f
end
assert(tostring(F) == "file (closed)")
end
assert(os.remove(file))
do
-- test writing/reading numbers
local f <close> = assert(io.open(file, "w"))
f:write(maxint, '\n')
f:write(string.format("0X%x\n", maxint))
f:write("0xABCp-3", '\n')
f:write(0, '\n')
f:write(-maxint, '\n')
f:write(string.format("0x%X\n", -maxint))
f:write("-0xABCp-3", '\n')
assert(f:close())
local f <close> = assert(io.open(file, "r"))
assert(f:read("n") == maxint)
assert(f:read("n") == maxint)
assert(f:read("n") == 0xABCp-3)
assert(f:read("n") == 0)
assert(f:read("*n") == -maxint) -- test old format (with '*')
assert(f:read("n") == -maxint)
assert(f:read("*n") == -0xABCp-3) -- test old format (with '*')
end
assert(os.remove(file))
-- testing multiple arguments to io.read
do
local f <close> = assert(io.open(file, "w"))
f:write[[
a line
another line
1234
3.45
one
two
three
]]
local l1, l2, l3, l4, n1, n2, c, dummy
assert(f:close())
local f <close> = assert(io.open(file, "r"))
l1, l2, n1, n2, dummy = f:read("l", "L", "n", "n")
assert(l1 == "a line" and l2 == "another line\n" and
n1 == 1234 and n2 == 3.45 and dummy == nil)
assert(f:close())
local f <close> = assert(io.open(file, "r"))
l1, l2, n1, n2, c, l3, l4, dummy = f:read(7, "l", "n", "n", 1, "l", "l")
assert(l1 == "a line\n" and l2 == "another line" and c == '\n' and
n1 == 1234 and n2 == 3.45 and l3 == "one" and l4 == "two"
and dummy == nil)
assert(f:close())
local f <close> = assert(io.open(file, "r"))
-- second item failing
l1, n1, n2, dummy = f:read("l", "n", "n", "l")
assert(l1 == "a line" and not n1)
end
assert(os.remove(file))
-- test yielding during 'dofile'
f = assert(io.open(file, "w"))
f:write[[
local x, z = coroutine.yield(10)
local y = coroutine.yield(20)
return x + y * z
]]
assert(f:close())
f = coroutine.wrap(dofile)
assert(f(file) == 10)
assert(f(100, 101) == 20)
assert(f(200) == 100 + 200 * 101)
assert(os.remove(file))
f = assert(io.open(file, "w"))
-- test number termination
f:write[[
-12.3- -0xffff+ .3|5.E-3X +234e+13E 0xDEADBEEFDEADBEEFx
0x1.13Ap+3e
]]
-- very long number
f:write("1234"); for i = 1, 1000 do f:write("0") end; f:write("\n")
-- invalid sequences (must read and discard valid prefixes)
f:write[[
.e+ 0.e; --; 0xX;
]]
assert(f:close())
f = assert(io.open(file, "r"))
assert(f:read("n") == -12.3); assert(f:read(1) == "-")
assert(f:read("n") == -0xffff); assert(f:read(2) == "+ ")
assert(f:read("n") == 0.3); assert(f:read(1) == "|")
assert(f:read("n") == 5e-3); assert(f:read(1) == "X")
assert(f:read("n") == 234e13); assert(f:read(1) == "E")
assert(f:read("n") == 0Xdeadbeefdeadbeef); assert(f:read(2) == "x\n")
assert(f:read("n") == 0x1.13aP3); assert(f:read(1) == "e")
do -- attempt to read too long number
assert(not f:read("n")) -- fails
local s = f:read("L") -- read rest of line
assert(string.find(s, "^00*\n$")) -- lots of 0's left
end
assert(not f:read("n")); assert(f:read(2) == "e+")
assert(not f:read("n")); assert(f:read(1) == ";")
assert(not f:read("n")); assert(f:read(2) == "-;")
assert(not f:read("n")); assert(f:read(1) == "X")
assert(not f:read("n")); assert(f:read(1) == ";")
assert(not f:read("n")); assert(not f:read(0)) -- end of file
assert(f:close())
assert(os.remove(file))
-- test line generators
assert(not pcall(io.lines, "non-existent-file"))
assert(os.rename(otherfile, file))
io.output(otherfile)
local n = 0
local f = io.lines(file)
while f() do n = n + 1 end;
assert(n == 6) -- number of lines in the file
checkerr("file is already closed", f)
checkerr("file is already closed", f)
-- copy from file to otherfile
n = 0
for l in io.lines(file) do io.write(l, "\n"); n = n + 1 end
io.close()
assert(n == 6)
-- copy from otherfile back to file
local f = assert(io.open(otherfile))
assert(io.type(f) == "file")
io.output(file)
assert(not io.output():read())
n = 0
for l in f:lines() do io.write(l, "\n"); n = n + 1 end
assert(tostring(f):sub(1, 5) == "file ")
assert(f:close()); io.close()
assert(n == 6)
checkerr("closed file", io.close, f)
assert(tostring(f) == "file (closed)")
assert(io.type(f) == "closed file")
io.input(file)
f = io.open(otherfile):lines()
n = 0
for l in io.lines() do assert(l == f()); n = n + 1 end
f = nil; collectgarbage()
assert(n == 6)
assert(os.remove(otherfile))
do -- bug in 5.3.1
io.output(otherfile)
io.write(string.rep("a", 300), "\n")
io.close()
local t ={}; for i = 1, 250 do t[i] = 1 end
t = {io.lines(otherfile, table.unpack(t))()}
-- everything ok here
assert(#t == 250 and t[1] == 'a' and t[#t] == 'a')
t[#t + 1] = 1 -- one too many
checkerr("too many arguments", io.lines, otherfile, table.unpack(t))
collectgarbage() -- ensure 'otherfile' is closed
assert(os.remove(otherfile))
end
io.input(file)
do -- test error returns
local a,b,c = io.input():write("xuxu")
assert(not a and type(b) == "string" and type(c) == "number")
end
checkerr("invalid format", io.read, "x")
assert(io.read(0) == "") -- not eof
assert(io.read(5, 'l') == '"álo"')
assert(io.read(0) == "")
assert(io.read() == "second line")
local x = io.input():seek()
assert(io.read() == "third line ")
assert(io.input():seek("set", x))
assert(io.read('L') == "third line \n")
assert(io.read(1) == "ç")
assert(io.read(string.len"fourth_line") == "fourth_line")
assert(io.input():seek("cur", -string.len"fourth_line"))
assert(io.read() == "fourth_line")
assert(io.read() == "") -- empty line
assert(io.read('n') == 3450)
assert(io.read(1) == '\n')
assert(not io.read(0)) -- end of file
assert(not io.read(1)) -- end of file
assert(not io.read(30000)) -- end of file
assert(({io.read(1)})[2] == undef)
assert(not io.read()) -- end of file
assert(({io.read()})[2] == undef)
assert(not io.read('n')) -- end of file
assert(({io.read('n')})[2] == undef)
assert(io.read('a') == '') -- end of file (OK for 'a')
assert(io.read('a') == '') -- end of file (OK for 'a')
collectgarbage()
print('+')
io.close(io.input())
checkerr(" input file is closed", io.read)
assert(os.remove(file))
local t = '0123456789'
for i=1,10 do t = t..t; end
assert(string.len(t) == 10*2^10)
io.output(file)
io.write("alo"):write("\n")
io.close()
checkerr(" output file is closed", io.write)
local f = io.open(file, "a+b")
io.output(f)
collectgarbage()
assert(io.write(' ' .. t .. ' '))
assert(io.write(';', 'end of file\n'))
f:flush(); io.flush()
f:close()
print('+')
io.input(file)
assert(io.read() == "alo")
assert(io.read(1) == ' ')
assert(io.read(string.len(t)) == t)
assert(io.read(1) == ' ')
assert(io.read(0))
assert(io.read('a') == ';end of file\n')
assert(not io.read(0))
assert(io.close(io.input()))
-- test errors in read/write
do
local function ismsg (m)
-- error message is not a code number
return (type(m) == "string" and not tonumber(m))
end
-- read
local f = io.open(file, "w")
local r, m, c = f:read()
assert(not r and ismsg(m) and type(c) == "number")
assert(f:close())
-- write
f = io.open(file, "r")
r, m, c = f:write("whatever")
assert(not r and ismsg(m) and type(c) == "number")
assert(f:close())
-- lines
f = io.open(file, "w")
r, m = pcall(f:lines())
assert(r == false and ismsg(m))
assert(f:close())
end
assert(os.remove(file))
-- test for L format
io.output(file); io.write"\n\nline\nother":close()
io.input(file)
assert(io.read"L" == "\n")
assert(io.read"L" == "\n")
assert(io.read"L" == "line\n")
assert(io.read"L" == "other")
assert(not io.read"L")
io.input():close()
local f = assert(io.open(file))
local s = ""
for l in f:lines("L") do s = s .. l end
assert(s == "\n\nline\nother")
f:close()
io.input(file)
s = ""
for l in io.lines(nil, "L") do s = s .. l end
assert(s == "\n\nline\nother")
io.input():close()
s = ""
for l in io.lines(file, "L") do s = s .. l end
assert(s == "\n\nline\nother")
s = ""
for l in io.lines(file, "l") do s = s .. l end
assert(s == "lineother")
io.output(file); io.write"a = 10 + 34\na = 2*a\na = -a\n":close()
local t = {}
assert(load(io.lines(file, "L"), nil, nil, t))()
assert(t.a == -((10 + 34) * 2))
do -- testing closing file in line iteration
-- get the to-be-closed variable from a loop
local function gettoclose (lv)
lv = lv + 1
local stvar = 0 -- to-be-closed is 4th state variable in the loop
for i = 1, 1000 do
local n, v = debug.getlocal(lv, i)
if n == "(for state)" then
stvar = stvar + 1
if stvar == 4 then return v end
end
end
end
local f
for l in io.lines(file) do
f = gettoclose(1)
assert(io.type(f) == "file")
break
end
assert(io.type(f) == "closed file")
f = nil
local function foo (name)
for l in io.lines(name) do
f = gettoclose(1)
assert(io.type(f) == "file")
error(f) -- exit loop with an error
end
end
local st, msg = pcall(foo, file)
assert(st == false and io.type(msg) == "closed file")
end
-- test for multipe arguments in 'lines'
io.output(file); io.write"0123456789\n":close()
for a,b in io.lines(file, 1, 1) do
if a == "\n" then assert(not b)
else assert(tonumber(a) == tonumber(b) - 1)
end
end
for a,b,c in io.lines(file, 1, 2, "a") do
assert(a == "0" and b == "12" and c == "3456789\n")
end
for a,b,c in io.lines(file, "a", 0, 1) do
if a == "" then break end
assert(a == "0123456789\n" and not b and not c)
end
collectgarbage() -- to close file in previous iteration
io.output(file); io.write"00\n10\n20\n30\n40\n":close()
for a, b in io.lines(file, "n", "n") do
if a == 40 then assert(not b)
else assert(a == b - 10)
end
end
-- test load x lines
io.output(file);
io.write[[
local y
= X
X =
X *
2 +
X;
X =
X
- y;
]]:close()
_G.X = 1
assert(not load((io.lines(file))))
collectgarbage() -- to close file in previous iteration
load((io.lines(file, "L")))()
assert(_G.X == 2)
load((io.lines(file, 1)))()
assert(_G.X == 4)
load((io.lines(file, 3)))()
assert(_G.X == 8)
print('+')
local x1 = "string\n\n\\com \"\"''coisas [[estranhas]] ]]'"
io.output(file)
assert(io.write(string.format("x2 = %q\n-- comment without ending EOS", x1)))
io.close()
assert(loadfile(file))()
assert(x1 == x2)
print('+')
assert(os.remove(file))
assert(not os.remove(file))
assert(not os.remove(otherfile))
-- testing loadfile
local function testloadfile (s, expres)
io.output(file)
if s then io.write(s) end
io.close()
local res = assert(loadfile(file))()
assert(os.remove(file))
assert(res == expres)
end
-- loading empty file
testloadfile(nil, nil)
-- loading file with initial comment without end of line
testloadfile("# a non-ending comment", nil)
-- checking Unicode BOM in files
testloadfile("\xEF\xBB\xBF# some comment\nreturn 234", 234)
testloadfile("\xEF\xBB\xBFreturn 239", 239)
testloadfile("\xEF\xBB\xBF", nil) -- empty file with a BOM
-- checking line numbers in files with initial comments
testloadfile("# a comment\nreturn require'debug'.getinfo(1).currentline", 2)
-- loading binary file
io.output(io.open(file, "wb"))
assert(io.write(string.dump(function () return 10, '\0alo\255', 'hi' end)))
io.close()
a, b, c = assert(loadfile(file))()
assert(a == 10 and b == "\0alo\255" and c == "hi")
assert(os.remove(file))
-- bug in 5.2.1
do
io.output(io.open(file, "wb"))
-- save function with no upvalues
assert(io.write(string.dump(function () return 1 end)))
io.close()
f = assert(loadfile(file, "b", {}))
assert(type(f) == "function" and f() == 1)
assert(os.remove(file))
end
-- loading binary file with initial comment
io.output(io.open(file, "wb"))
assert(io.write("#this is a comment for a binary file\0\n",
string.dump(function () return 20, '\0\0\0' end)))
io.close()
a, b, c = assert(loadfile(file))()
assert(a == 20 and b == "\0\0\0" and c == nil)
assert(os.remove(file))
-- 'loadfile' with 'env'
do
local f = io.open(file, 'w')
f:write[[
if (...) then a = 15; return b, c, d
else return _ENV
end
]]
f:close()
local t = {b = 12, c = "xuxu", d = print}
local f = assert(loadfile(file, 't', t))
local b, c, d = f(1)
assert(t.a == 15 and b == 12 and c == t.c and d == print)
assert(f() == t)
f = assert(loadfile(file, 't', nil))
assert(f() == nil)
f = assert(loadfile(file))
assert(f() == _G)
assert(os.remove(file))
end
-- 'loadfile' x modes
do
io.open(file, 'w'):write("return 10"):close()
local s, m = loadfile(file, 'b')
assert(not s and string.find(m, "a text chunk"))
io.open(file, 'w'):write("\27 return 10"):close()
local s, m = loadfile(file, 't')
assert(not s and string.find(m, "a binary chunk"))
assert(os.remove(file))
end
io.output(file)
assert(io.write("qualquer coisa\n"))
assert(io.write("mais qualquer coisa"))
io.close()
assert(io.output(assert(io.open(otherfile, 'wb')))
:write("outra coisa\0\1\3\0\0\0\0\255\0")
:close())
local filehandle = assert(io.open(file, 'r+'))
local otherfilehandle = assert(io.open(otherfile, 'rb'))
assert(filehandle ~= otherfilehandle)
assert(type(filehandle) == "userdata")
assert(filehandle:read('l') == "qualquer coisa")
io.input(otherfilehandle)
assert(io.read(string.len"outra coisa") == "outra coisa")
assert(filehandle:read('l') == "mais qualquer coisa")
filehandle:close();
assert(type(filehandle) == "userdata")
io.input(otherfilehandle)
assert(io.read(4) == "\0\1\3\0")
assert(io.read(3) == "\0\0\0")
assert(io.read(0) == "") -- 255 is not eof
assert(io.read(1) == "\255")
assert(io.read('a') == "\0")
assert(not io.read(0))
assert(otherfilehandle == io.input())
otherfilehandle:close()
assert(os.remove(file))
assert(os.remove(otherfile))
collectgarbage()
io.output(file)
:write[[
123.4 -56e-2 not a number
second line
third line
and the rest of the file
]]
:close()
io.input(file)
local _,a,b,c,d,e,h,__ = io.read(1, 'n', 'n', 'l', 'l', 'l', 'a', 10)
assert(io.close(io.input()))
assert(_ == ' ' and not __)
assert(type(a) == 'number' and a==123.4 and b==-56e-2)
assert(d=='second line' and e=='third line')
assert(h==[[
and the rest of the file
]])
assert(os.remove(file))
collectgarbage()
-- testing buffers
do
local f = assert(io.open(file, "w"))
local fr = assert(io.open(file, "r"))
assert(f:setvbuf("full", 2000))
f:write("x")
assert(fr:read("all") == "") -- full buffer; output not written yet
f:close()
fr:seek("set")
assert(fr:read("all") == "x") -- `close' flushes it
f = assert(io.open(file), "w")
assert(f:setvbuf("no"))
f:write("x")
fr:seek("set")
assert(fr:read("all") == "x") -- no buffer; output is ready
f:close()
f = assert(io.open(file, "a"))
assert(f:setvbuf("line"))
f:write("x")
fr:seek("set", 1)
assert(fr:read("all") == "") -- line buffer; no output without `\n'
f:write("a\n"):seek("set", 1)
assert(fr:read("all") == "xa\n") -- now we have a whole line
f:close(); fr:close()
assert(os.remove(file))
end
if not _soft then
print("testing large files (> BUFSIZ)")
io.output(file)
for i=1,5001 do io.write('0123456789123') end
io.write('\n12346'):close()
io.input(file)
local x = io.read('a')
io.input():seek('set', 0)
local y = io.read(30001)..io.read(1005)..io.read(0)..
io.read(1)..io.read(100003)
assert(x == y and string.len(x) == 5001*13 + 6)
io.input():seek('set', 0)
y = io.read() -- huge line
assert(x == y..'\n'..io.read())
assert(not io.read())
io.close(io.input())
assert(os.remove(file))
x = nil; y = nil
end
if not _port then
local progname
do -- get name of running executable
local arg = arg or ARG
local i = 0
while arg[i] do i = i - 1 end
progname = '"' .. arg[i + 1] .. '"'
end
print("testing popen/pclose and execute")
local tests = {
-- command, what, code
{"ls > /dev/null", "ok"},
{"not-to-be-found-command", "exit"},
{"exit 3", "exit", 3},
{"exit 129", "exit", 129},
{"kill -s HUP $$", "signal", 1},
{"kill -s KILL $$", "signal", 9},
{"sh -c 'kill -s HUP $$'", "exit"},
{progname .. ' -e " "', "ok"},
{progname .. ' -e "os.exit(0, true)"', "ok"},
{progname .. ' -e "os.exit(20, true)"', "exit", 20},
}
print("\n(some error messages are expected now)")
for _, v in ipairs(tests) do
local x, y, z = io.popen(v[1]):close()
local x1, y1, z1 = os.execute(v[1])
assert(x == x1 and y == y1 and z == z1)
if v[2] == "ok" then
assert(x and y == 'exit' and z == 0)
else
assert(not x and y == v[2]) -- correct status and 'what'
-- correct code if known (but always different from 0)
assert((v[3] == nil and z > 0) or v[3] == z)
end
end
end
-- testing tmpfile
f = io.tmpfile()
assert(io.type(f) == "file")
f:write("alo")
f:seek("set")
assert(f:read"a" == "alo")
end --}
print'+'
print("testing date/time")
assert(os.date("") == "")
assert(os.date("!") == "")
assert(os.date("\0\0") == "\0\0")
assert(os.date("!\0\0") == "\0\0")
local x = string.rep("a", 10000)
assert(os.date(x) == x)
local t = os.time()
D = os.date("*t", t)
assert(os.date(string.rep("%d", 1000), t) ==
string.rep(os.date("%d", t), 1000))
assert(os.date(string.rep("%", 200)) == string.rep("%", 100))
local function checkDateTable (t)
_G.D = os.date("*t", t)
assert(os.time(D) == t)
load(os.date([[assert(D.year==%Y and D.month==%m and D.day==%d and
D.hour==%H and D.min==%M and D.sec==%S and
D.wday==%w+1 and D.yday==%j)]], t))()
_G.D = nil
end
checkDateTable(os.time())
if not _port then
-- assume that time_t can represent these values
checkDateTable(0)
checkDateTable(1)
checkDateTable(1000)
checkDateTable(0x7fffffff)
checkDateTable(0x80000000)
end
checkerr("invalid conversion specifier", os.date, "%")
checkerr("invalid conversion specifier", os.date, "%9")
checkerr("invalid conversion specifier", os.date, "%")
checkerr("invalid conversion specifier", os.date, "%O")
checkerr("invalid conversion specifier", os.date, "%E")
checkerr("invalid conversion specifier", os.date, "%Ea")
checkerr("not an integer", os.time, {year=1000, month=1, day=1, hour='x'})
checkerr("not an integer", os.time, {year=1000, month=1, day=1, hour=1.5})
checkerr("missing", os.time, {hour = 12}) -- missing date
if string.packsize("i") == 4 then -- 4-byte ints
checkerr("field 'year' is out-of-bound", os.time,
{year = -(1 << 31) + 1899, month = 1, day = 1})
end
if not _port then
-- test Posix-specific modifiers
assert(type(os.date("%Ex")) == 'string')
assert(type(os.date("%Oy")) == 'string')
-- test large dates (assume at least 4-byte ints and time_t)
local t0 = os.time{year = 1970, month = 1, day = 0}
local t1 = os.time{year = 1970, month = 1, day = 0, sec = (1 << 31) - 1}
assert(t1 - t0 == (1 << 31) - 1)
t0 = os.time{year = 1970, month = 1, day = 1}
t1 = os.time{year = 1970, month = 1, day = 1, sec = -(1 << 31)}
assert(t1 - t0 == -(1 << 31))
-- test out-of-range dates (at least for Unix)
if maxint >= 2^62 then -- cannot do these tests in Small Lua
-- no arith overflows
checkerr("out-of-bound", os.time, {year = -maxint, month = 1, day = 1})
if string.packsize("i") == 4 then -- 4-byte ints
if testerr("out-of-bound", os.date, "%Y", 2^40) then
-- time_t has 4 bytes and therefore cannot represent year 4000
print(" 4-byte time_t")
checkerr("cannot be represented", os.time, {year=4000, month=1, day=1})
else
-- time_t has 8 bytes; an int year cannot represent a huge time
print(" 8-byte time_t")
checkerr("cannot be represented", os.date, "%Y", 2^60)
-- this is the maximum year
assert(tonumber(os.time
{year=(1 << 31) + 1899, month=12, day=31, hour=23, min=59, sec=59}))
-- this is too much
checkerr("represented", os.time,
{year=(1 << 31) + 1899, month=12, day=31, hour=23, min=59, sec=60})
end
-- internal 'int' fields cannot hold these values
checkerr("field 'day' is out-of-bound", os.time,
{year = 0, month = 1, day = 2^32})
checkerr("field 'month' is out-of-bound", os.time,
{year = 0, month = -((1 << 31) + 1), day = 1})
checkerr("field 'year' is out-of-bound", os.time,
{year = (1 << 31) + 1900, month = 1, day = 1})
else -- 8-byte ints
-- assume time_t has 8 bytes too
print(" 8-byte time_t")
assert(tonumber(os.date("%Y", 2^60)))
-- but still cannot represent a huge year
checkerr("cannot be represented", os.time, {year=2^60, month=1, day=1})
end
end
end
do
local D = os.date("*t")
local t = os.time(D)
if D.isdst == nil then
print("no daylight saving information")
else
assert(type(D.isdst) == 'boolean')
end
D.isdst = nil
local t1 = os.time(D)
assert(t == t1) -- if isdst is absent uses correct default
end
local D = os.date("*t")
t = os.time(D)
D.year = D.year-1;
local t1 = os.time(D)
-- allow for leap years
assert(math.abs(os.difftime(t,t1)/(24*3600) - 365) < 2)
-- should not take more than 1 second to execute these two lines
t = os.time()
t1 = os.time(os.date("*t"))
local diff = os.difftime(t1,t)
assert(0 <= diff and diff <= 1)
diff = os.difftime(t,t1)
assert(-1 <= diff and diff <= 0)
local t1 = os.time{year=2000, month=10, day=1, hour=23, min=12}
local t2 = os.time{year=2000, month=10, day=1, hour=23, min=10, sec=19}
assert(os.difftime(t1,t2) == 60*2-19)
-- since 5.3.3, 'os.time' normalizes table fields
t1 = {year = 2005, month = 1, day = 1, hour = 1, min = 0, sec = -3602}
os.time(t1)
assert(t1.day == 31 and t1.month == 12 and t1.year == 2004 and
t1.hour == 23 and t1.min == 59 and t1.sec == 58 and
t1.yday == 366)
io.output(io.stdout)
local t = os.date('%d %m %Y %H %M %S')
local d, m, a, h, min, s = string.match(t,
"(%d+) (%d+) (%d+) (%d+) (%d+) (%d+)")
d = tonumber(d)
m = tonumber(m)
a = tonumber(a)
h = tonumber(h)
min = tonumber(min)
s = tonumber(s)
io.write(string.format('test done on %2.2d/%2.2d/%d', d, m, a))
io.write(string.format(', at %2.2d:%2.2d:%2.2d\n', h, min, s))
io.write(string.format('%s\n', _VERSION))
GC¶
-- $Id: testes/gc.lua $
-- See Copyright Notice in file all.lua
print('testing incremental garbage collection')
local debug = require"debug"
assert(collectgarbage("isrunning"))
collectgarbage()
local oldmode = collectgarbage("incremental")
-- changing modes should return previous mode
assert(collectgarbage("generational") == "incremental")
assert(collectgarbage("generational") == "generational")
assert(collectgarbage("incremental") == "generational")
assert(collectgarbage("incremental") == "incremental")
local function nop () end
local function gcinfo ()
return collectgarbage"count" * 1024
end
-- test weird parameters to 'collectgarbage'
do
-- save original parameters
local a = collectgarbage("setpause", 200)
local b = collectgarbage("setstepmul", 200)
local t = {0, 2, 10, 90, 500, 5000, 30000, 0x7ffffffe}
for i = 1, #t do
local p = t[i]
for j = 1, #t do
local m = t[j]
collectgarbage("setpause", p)
collectgarbage("setstepmul", m)
collectgarbage("step", 0)
collectgarbage("step", 10000)
end
end
-- restore original parameters
collectgarbage("setpause", a)
collectgarbage("setstepmul", b)
collectgarbage()
end
_G["while"] = 234
--
-- tests for GC activation when creating different kinds of objects
--
local function GC1 ()
local u
local b -- (above 'u' it in the stack)
local finish = false
u = setmetatable({}, {__gc = function () finish = true end})
b = {34}
repeat u = {} until finish
assert(b[1] == 34) -- 'u' was collected, but 'b' was not
finish = false; local i = 1
u = setmetatable({}, {__gc = function () finish = true end})
repeat i = i + 1; u = tostring(i) .. tostring(i) until finish
assert(b[1] == 34) -- 'u' was collected, but 'b' was not
finish = false
u = setmetatable({}, {__gc = function () finish = true end})
repeat local i; u = function () return i end until finish
assert(b[1] == 34) -- 'u' was collected, but 'b' was not
end
local function GC2 ()
local u
local finish = false
u = {setmetatable({}, {__gc = function () finish = true end})}
local b = {34}
repeat u = {{}} until finish
assert(b[1] == 34) -- 'u' was collected, but 'b' was not
finish = false; local i = 1
u = {setmetatable({}, {__gc = function () finish = true end})}
repeat i = i + 1; u = {tostring(i) .. tostring(i)} until finish
assert(b[1] == 34) -- 'u' was collected, but 'b' was not
finish = false
u = {setmetatable({}, {__gc = function () finish = true end})}
repeat local i; u = {function () return i end} until finish
assert(b[1] == 34) -- 'u' was collected, but 'b' was not
end
local function GC() GC1(); GC2() end
do
print("creating many objects")
local limit = 5000
for i = 1, limit do
local a = {}; a = nil
end
local a = "a"
for i = 1, limit do
a = i .. "b";
a = string.gsub(a, '(%d%d*)', "%1 %1")
a = "a"
end
a = {}
function a:test ()
for i = 1, limit do
load(string.format("function temp(a) return 'a%d' end", i), "")()
assert(temp() == string.format('a%d', i))
end
end
a:test()
end
-- collection of functions without locals, globals, etc.
do local f = function () end end
print("functions with errors")
prog = [[
do
a = 10;
function foo(x,y)
a = sin(a+0.456-0.23e-12);
return function (z) return sin(%x+z) end
end
local x = function (w) a=a+w; end
end
]]
do
local step = 1
if _soft then step = 13 end
for i=1, string.len(prog), step do
for j=i, string.len(prog), step do
pcall(load(string.sub(prog, i, j), ""))
end
end
end
foo = nil
print('long strings')
x = "01234567890123456789012345678901234567890123456789012345678901234567890123456789"
assert(string.len(x)==80)
s = ''
k = math.min(300, (math.maxinteger // 80) // 2)
for n = 1, k do s = s..x; j=tostring(n) end
assert(string.len(s) == k*80)
s = string.sub(s, 1, 10000)
s, i = string.gsub(s, '(%d%d%d%d)', '')
assert(i==10000 // 4)
s = nil
x = nil
assert(_G["while"] == 234)
--
-- test the "size" of basic GC steps (whatever they mean...)
--
do
print("steps")
print("steps (2)")
local function dosteps (siz)
collectgarbage()
local a = {}
for i=1,100 do a[i] = {{}}; local b = {} end
local x = gcinfo()
local i = 0
repeat -- do steps until it completes a collection cycle
i = i+1
until collectgarbage("step", siz)
assert(gcinfo() < x)
return i -- number of steps
end
collectgarbage"stop"
if not _port then
assert(dosteps(10) < dosteps(2))
end
-- collector should do a full collection with so many steps
assert(dosteps(20000) == 1)
assert(collectgarbage("step", 20000) == true)
assert(collectgarbage("step", 20000) == true)
assert(not collectgarbage("isrunning"))
collectgarbage"restart"
assert(collectgarbage("isrunning"))
end
if not _port then
-- test the pace of the collector
collectgarbage(); collectgarbage()
local x = gcinfo()
collectgarbage"stop"
repeat
local a = {}
until gcinfo() > 3 * x
collectgarbage"restart"
assert(collectgarbage("isrunning"))
repeat
local a = {}
until gcinfo() <= x * 2
end
print("clearing tables")
lim = 15
a = {}
-- fill a with `collectable' indices
for i=1,lim do a[{}] = i end
b = {}
for k,v in pairs(a) do b[k]=v end
-- remove all indices and collect them
for n in pairs(b) do
a[n] = undef
assert(type(n) == 'table' and next(n) == nil)
collectgarbage()
end
b = nil
collectgarbage()
for n in pairs(a) do error'cannot be here' end
for i=1,lim do a[i] = i end
for i=1,lim do assert(a[i] == i) end
print('weak tables')
a = {}; setmetatable(a, {__mode = 'k'});
-- fill a with some `collectable' indices
for i=1,lim do a[{}] = i end
-- and some non-collectable ones
for i=1,lim do a[i] = i end
for i=1,lim do local s=string.rep('@', i); a[s] = s..'#' end
collectgarbage()
local i = 0
for k,v in pairs(a) do assert(k==v or k..'#'==v); i=i+1 end
assert(i == 2*lim)
a = {}; setmetatable(a, {__mode = 'v'});
a[1] = string.rep('b', 21)
collectgarbage()
assert(a[1]) -- strings are *values*
a[1] = undef
-- fill a with some `collectable' values (in both parts of the table)
for i=1,lim do a[i] = {} end
for i=1,lim do a[i..'x'] = {} end
-- and some non-collectable ones
for i=1,lim do local t={}; a[t]=t end
for i=1,lim do a[i+lim]=i..'x' end
collectgarbage()
local i = 0
for k,v in pairs(a) do assert(k==v or k-lim..'x' == v); i=i+1 end
assert(i == 2*lim)
a = {}; setmetatable(a, {__mode = 'kv'});
local x, y, z = {}, {}, {}
-- keep only some items
a[1], a[2], a[3] = x, y, z
a[string.rep('$', 11)] = string.rep('$', 11)
-- fill a with some `collectable' values
for i=4,lim do a[i] = {} end
for i=1,lim do a[{}] = i end
for i=1,lim do local t={}; a[t]=t end
collectgarbage()
assert(next(a) ~= nil)
local i = 0
for k,v in pairs(a) do
assert((k == 1 and v == x) or
(k == 2 and v == y) or
(k == 3 and v == z) or k==v);
i = i+1
end
assert(i == 4)
x,y,z=nil
collectgarbage()
assert(next(a) == string.rep('$', 11))
-- 'bug' in 5.1
a = {}
local t = {x = 10}
local C = setmetatable({key = t}, {__mode = 'v'})
local C1 = setmetatable({[t] = 1}, {__mode = 'k'})
a.x = t -- this should not prevent 't' from being removed from
-- weak table 'C' by the time 'a' is finalized
setmetatable(a, {__gc = function (u)
assert(C.key == nil)
assert(type(next(C1)) == 'table')
end})
a, t = nil
collectgarbage()
collectgarbage()
assert(next(C) == nil and next(C1) == nil)
C, C1 = nil
-- ephemerons
local mt = {__mode = 'k'}
a = {{10},{20},{30},{40}}; setmetatable(a, mt)
x = nil
for i = 1, 100 do local n = {}; a[n] = {k = {x}}; x = n end
GC()
local n = x
local i = 0
while n do n = a[n].k[1]; i = i + 1 end
assert(i == 100)
x = nil
GC()
for i = 1, 4 do assert(a[i][1] == i * 10); a[i] = undef end
assert(next(a) == nil)
local K = {}
a[K] = {}
for i=1,10 do a[K][i] = {}; a[a[K][i]] = setmetatable({}, mt) end
x = nil
local k = 1
for j = 1,100 do
local n = {}; local nk = k%10 + 1
a[a[K][nk]][n] = {x, k = k}; x = n; k = nk
end
GC()
local n = x
local i = 0
while n do local t = a[a[K][k]][n]; n = t[1]; k = t.k; i = i + 1 end
assert(i == 100)
K = nil
GC()
-- assert(next(a) == nil)
-- testing errors during GC
if T then
collectgarbage("stop") -- stop collection
local u = {}
local s = {}; setmetatable(s, {__mode = 'k'})
setmetatable(u, {__gc = function (o)
local i = s[o]
s[i] = true
assert(not s[i - 1]) -- check proper finalization order
if i == 8 then error("@expected@") end -- error during GC
end})
for i = 6, 10 do
local n = setmetatable({}, getmetatable(u))
s[n] = i
end
warn("@on"); warn("@store")
collectgarbage()
assert(string.find(_WARN, "error in __gc metamethod"))
assert(string.match(_WARN, "@(.-)@") == "expected"); _WARN = nil
for i = 8, 10 do assert(s[i]) end
for i = 1, 5 do
local n = setmetatable({}, getmetatable(u))
s[n] = i
end
collectgarbage()
for i = 1, 10 do assert(s[i]) end
getmetatable(u).__gc = nil
warn("@normal")
end
print '+'
-- testing userdata
if T==nil then
(Message or print)('\n >>> testC not active: skipping userdata GC tests <<<\n')
else
local function newproxy(u)
return debug.setmetatable(T.newuserdata(0), debug.getmetatable(u))
end
collectgarbage("stop") -- stop collection
local u = newproxy(nil)
debug.setmetatable(u, {__gc = true})
local s = 0
local a = {[u] = 0}; setmetatable(a, {__mode = 'vk'})
for i=1,10 do a[newproxy(u)] = i end
for k in pairs(a) do assert(getmetatable(k) == getmetatable(u)) end
local a1 = {}; for k,v in pairs(a) do a1[k] = v end
for k,v in pairs(a1) do a[v] = k end
for i =1,10 do assert(a[i]) end
getmetatable(u).a = a1
getmetatable(u).u = u
do
local u = u
getmetatable(u).__gc = function (o)
assert(a[o] == 10-s)
assert(a[10-s] == undef) -- udata already removed from weak table
assert(getmetatable(o) == getmetatable(u))
assert(getmetatable(o).a[o] == 10-s)
s=s+1
end
end
a1, u = nil
assert(next(a) ~= nil)
collectgarbage()
assert(s==11)
collectgarbage()
assert(next(a) == nil) -- finalized keys are removed in two cycles
end
-- __gc x weak tables
local u = setmetatable({}, {__gc = true})
-- __gc metamethod should be collected before running
setmetatable(getmetatable(u), {__mode = "v"})
getmetatable(u).__gc = function (o) os.exit(1) end -- cannot happen
u = nil
collectgarbage()
local u = setmetatable({}, {__gc = true})
local m = getmetatable(u)
m.x = {[{0}] = 1; [0] = {1}}; setmetatable(m.x, {__mode = "kv"});
m.__gc = function (o)
assert(next(getmetatable(o).x) == nil)
m = 10
end
u, m = nil
collectgarbage()
assert(m==10)
do -- tests for string keys in weak tables
collectgarbage(); collectgarbage()
local m = collectgarbage("count") -- current memory
local a = setmetatable({}, {__mode = "kv"})
a[string.rep("a", 2^22)] = 25 -- long string key -> number value
a[string.rep("b", 2^22)] = {} -- long string key -> colectable value
a[{}] = 14 -- colectable key
assert(collectgarbage("count") > m + 2^13) -- 2^13 == 2 * 2^22 in KB
collectgarbage()
assert(collectgarbage("count") >= m + 2^12 and
collectgarbage("count") < m + 2^13) -- one key was collected
local k, v = next(a) -- string key with number value preserved
assert(k == string.rep("a", 2^22) and v == 25)
assert(next(a, k) == nil) -- everything else cleared
assert(a[string.rep("b", 2^22)] == undef)
a[k] = undef -- erase this last entry
k = nil
collectgarbage()
assert(next(a) == nil)
-- make sure will not try to compare with dead key
assert(a[string.rep("b", 100)] == undef)
assert(collectgarbage("count") <= m + 1) -- eveything collected
end
-- errors during collection
if T then
warn("@store")
u = setmetatable({}, {__gc = function () error "@expected error" end})
u = nil
collectgarbage()
assert(string.find(_WARN, "@expected error")); _WARN = nil
warn("@normal")
end
if not _soft then
print("long list")
local a = {}
for i = 1,200000 do
a = {next = a}
end
a = nil
collectgarbage()
end
-- create many threads with self-references and open upvalues
print("self-referenced threads")
local thread_id = 0
local threads = {}
local function fn (thread)
local x = {}
threads[thread_id] = function()
thread = x
end
coroutine.yield()
end
while thread_id < 1000 do
local thread = coroutine.create(fn)
coroutine.resume(thread, thread)
thread_id = thread_id + 1
end
-- Create a closure (function inside 'f') with an upvalue ('param') that
-- points (through a table) to the closure itself and to the thread
-- ('co' and the initial value of 'param') where closure is running.
-- Then, assert that table (and therefore everything else) will be
-- collected.
do
local collected = false -- to detect collection
collectgarbage(); collectgarbage("stop")
do
local function f (param)
;(function ()
assert(type(f) == 'function' and type(param) == 'thread')
param = {param, f}
setmetatable(param, {__gc = function () collected = true end})
coroutine.yield(100)
end)()
end
local co = coroutine.create(f)
assert(coroutine.resume(co, co))
end
-- Now, thread and closure are not reacheable any more.
collectgarbage()
assert(collected)
collectgarbage("restart")
end
do
collectgarbage()
collectgarbage"stop"
collectgarbage("step", 0) -- steps should not unblock the collector
local x = gcinfo()
repeat
for i=1,1000 do _ENV.a = {} end -- no collection during the loop
until gcinfo() > 2 * x
collectgarbage"restart"
end
if T then -- tests for weird cases collecting upvalues
local function foo ()
local a = {x = 20}
coroutine.yield(function () return a.x end) -- will run collector
assert(a.x == 20) -- 'a' is 'ok'
a = {x = 30} -- create a new object
assert(T.gccolor(a) == "white") -- of course it is new...
coroutine.yield(100) -- 'a' is still local to this thread
end
local t = setmetatable({}, {__mode = "kv"})
collectgarbage(); collectgarbage('stop')
-- create coroutine in a weak table, so it will never be marked
t.co = coroutine.wrap(foo)
local f = t.co() -- create function to access local 'a'
T.gcstate("atomic") -- ensure all objects are traversed
assert(T.gcstate() == "atomic")
assert(t.co() == 100) -- resume coroutine, creating new table for 'a'
assert(T.gccolor(t.co) == "white") -- thread was not traversed
T.gcstate("pause") -- collect thread, but should mark 'a' before that
assert(t.co == nil and f() == 30) -- ensure correct access to 'a'
collectgarbage("restart")
-- test barrier in sweep phase (backing userdata to gray)
local u = T.newuserdata(0, 1) -- create a userdata
collectgarbage()
collectgarbage"stop"
local a = {} -- avoid 'u' as first element in 'allgc'
T.gcstate"atomic"
T.gcstate"sweepallgc"
local x = {}
assert(T.gccolor(u) == "black") -- userdata is "old" (black)
assert(T.gccolor(x) == "white") -- table is "new" (white)
debug.setuservalue(u, x) -- trigger barrier
assert(T.gccolor(u) == "gray") -- userdata changed back to gray
collectgarbage"restart"
print"+"
end
if T then
local debug = require "debug"
collectgarbage("stop")
local x = T.newuserdata(0)
local y = T.newuserdata(0)
debug.setmetatable(y, {__gc = nop}) -- bless the new udata before...
debug.setmetatable(x, {__gc = nop}) -- ...the old one
assert(T.gccolor(y) == "white")
T.checkmemory()
collectgarbage("restart")
end
if T then
print("emergency collections")
collectgarbage()
collectgarbage()
T.totalmem(T.totalmem() + 200)
for i=1,200 do local a = {} end
T.totalmem(0)
collectgarbage()
local t = T.totalmem("table")
local a = {{}, {}, {}} -- create 4 new tables
assert(T.totalmem("table") == t + 4)
t = T.totalmem("function")
a = function () end -- create 1 new closure
assert(T.totalmem("function") == t + 1)
t = T.totalmem("thread")
a = coroutine.create(function () end) -- create 1 new coroutine
assert(T.totalmem("thread") == t + 1)
end
-- create an object to be collected when state is closed
do
local setmetatable,assert,type,print,getmetatable =
setmetatable,assert,type,print,getmetatable
local tt = {}
tt.__gc = function (o)
assert(getmetatable(o) == tt)
-- create new objects during GC
local a = 'xuxu'..(10+3)..'joao', {}
___Glob = o -- ressurrect object!
setmetatable({}, tt) -- creates a new one with same metatable
print(">>> closing state " .. "<<<\n")
end
local u = setmetatable({}, tt)
___Glob = {u} -- avoid object being collected before program end
end
-- create several objects to raise errors when collected while closing state
if T then
local error, assert, find, warn = error, assert, string.find, warn
local n = 0
local lastmsg
local mt = {__gc = function (o)
n = n + 1
assert(n == o[1])
if n == 1 then
_WARN = nil
elseif n == 2 then
assert(find(_WARN, "@expected warning"))
lastmsg = _WARN -- get message from previous error (first 'o')
else
assert(lastmsg == _WARN) -- subsequent error messages are equal
end
warn("@store"); _WARN = nil
error"@expected warning"
end}
for i = 10, 1, -1 do
-- create object and preserve it until the end
table.insert(___Glob, setmetatable({i}, mt))
end
end
-- just to make sure
assert(collectgarbage'isrunning')
collectgarbage(oldmode)
print('OK')
GOTO¶
-- $Id: testes/goto.lua $
-- See Copyright Notice in file all.lua
collectgarbage()
local function errmsg (code, m)
local st, msg = load(code)
assert(not st and string.find(msg, m))
end
-- cannot see label inside block
errmsg([[ goto l1; do ::l1:: end ]], "label 'l1'")
errmsg([[ do ::l1:: end goto l1; ]], "label 'l1'")
-- repeated label
errmsg([[ ::l1:: ::l1:: ]], "label 'l1'")
errmsg([[ ::l1:: do ::l1:: end]], "label 'l1'")
-- undefined label
errmsg([[ goto l1; local aa ::l1:: ::l2:: print(3) ]], "local 'aa'")
-- jumping over variable definition
errmsg([[
do local bb, cc; goto l1; end
local aa
::l1:: print(3)
]], "local 'aa'")
-- jumping into a block
errmsg([[ do ::l1:: end goto l1 ]], "label 'l1'")
errmsg([[ goto l1 do ::l1:: end ]], "label 'l1'")
-- cannot continue a repeat-until with variables
errmsg([[
repeat
if x then goto cont end
local xuxu = 10
::cont::
until xuxu < x
]], "local 'xuxu'")
-- simple gotos
local x
do
local y = 12
goto l1
::l2:: x = x + 1; goto l3
::l1:: x = y; goto l2
end
::l3:: ::l3_1:: assert(x == 13)
-- long labels
do
local prog = [[
do
local a = 1
goto l%sa; a = a + 1
::l%sa:: a = a + 10
goto l%sb; a = a + 2
::l%sb:: a = a + 20
return a
end
]]
local label = string.rep("0123456789", 40)
prog = string.format(prog, label, label, label, label)
assert(assert(load(prog))() == 31)
end
-- ok to jump over local dec. to end of block
do
goto l1
local a = 23
x = a
::l1::;
end
while true do
goto l4
goto l1 -- ok to jump over local dec. to end of block
goto l1 -- multiple uses of same label
local x = 45
::l1:: ;;;
end
::l4:: assert(x == 13)
if print then
goto l1 -- ok to jump over local dec. to end of block
error("should not be here")
goto l2 -- ok to jump over local dec. to end of block
local x
::l1:: ; ::l2:: ;;
else end
-- to repeat a label in a different function is OK
local function foo ()
local a = {}
goto l3
::l1:: a[#a + 1] = 1; goto l2;
::l2:: a[#a + 1] = 2; goto l5;
::l3::
::l3a:: a[#a + 1] = 3; goto l1;
::l4:: a[#a + 1] = 4; goto l6;
::l5:: a[#a + 1] = 5; goto l4;
::l6:: assert(a[1] == 3 and a[2] == 1 and a[3] == 2 and
a[4] == 5 and a[5] == 4)
if not a[6] then a[6] = true; goto l3a end -- do it twice
end
::l6:: foo()
do -- bug in 5.2 -> 5.3.2
local x
::L1::
local y -- cannot join this SETNIL with previous one
assert(y == nil)
y = true
if x == nil then
x = 1
goto L1
else
x = x + 1
end
assert(x == 2 and y == true)
end
-- bug in 5.3
do
local first = true
local a = false
if true then
goto LBL
::loop::
a = true
::LBL::
if first then
first = false
goto loop
end
end
assert(a)
end
do -- compiling infinite loops
goto escape -- do not run the infinite loops
::a:: goto a
::b:: goto c
::c:: goto b
end
::escape::
--------------------------------------------------------------------------------
-- testing closing of upvalues
local debug = require 'debug'
local function foo ()
local t = {}
do
local i = 1
local a, b, c, d
t[1] = function () return a, b, c, d end
::l1::
local b
do
local c
t[#t + 1] = function () return a, b, c, d end -- t[2], t[4], t[6]
if i > 2 then goto l2 end
do
local d
t[#t + 1] = function () return a, b, c, d end -- t[3], t[5]
i = i + 1
local a
goto l1
end
end
end
::l2:: return t
end
local a = foo()
assert(#a == 6)
-- all functions share same 'a'
for i = 2, 6 do
assert(debug.upvalueid(a[1], 1) == debug.upvalueid(a[i], 1))
end
-- 'b' and 'c' are shared among some of them
for i = 2, 6 do
-- only a[1] uses external 'b'/'b'
assert(debug.upvalueid(a[1], 2) ~= debug.upvalueid(a[i], 2))
assert(debug.upvalueid(a[1], 3) ~= debug.upvalueid(a[i], 3))
end
for i = 3, 5, 2 do
-- inner functions share 'b'/'c' with previous ones
assert(debug.upvalueid(a[i], 2) == debug.upvalueid(a[i - 1], 2))
assert(debug.upvalueid(a[i], 3) == debug.upvalueid(a[i - 1], 3))
-- but not with next ones
assert(debug.upvalueid(a[i], 2) ~= debug.upvalueid(a[i + 1], 2))
assert(debug.upvalueid(a[i], 3) ~= debug.upvalueid(a[i + 1], 3))
end
-- only external 'd' is shared
for i = 2, 6, 2 do
assert(debug.upvalueid(a[1], 4) == debug.upvalueid(a[i], 4))
end
-- internal 'd's are all different
for i = 3, 5, 2 do
for j = 1, 6 do
assert((debug.upvalueid(a[i], 4) == debug.upvalueid(a[j], 4))
== (i == j))
end
end
--------------------------------------------------------------------------------
-- testing if x goto optimizations
local function testG (a)
if a == 1 then
goto l1
error("should never be here!")
elseif a == 2 then goto l2
elseif a == 3 then goto l3
elseif a == 4 then
goto l1 -- go to inside the block
error("should never be here!")
::l1:: a = a + 1 -- must go to 'if' end
else
goto l4
::l4a:: a = a * 2; goto l4b
error("should never be here!")
::l4:: goto l4a
error("should never be here!")
::l4b::
end
do return a end
::l2:: do return "2" end
::l3:: do return "3" end
::l1:: return "1"
end
assert(testG(1) == "1")
assert(testG(2) == "2")
assert(testG(3) == "3")
assert(testG(4) == 5)
assert(testG(5) == 10)
do
-- if x back goto out of scope of upvalue
local X
goto L1
::L2:: goto L3
::L1:: do
local a <close> = setmetatable({}, {__close = function () X = true end})
assert(X == nil)
if a then goto L2 end -- jumping back out of scope of 'a'
end
::L3:: assert(X == true) -- checks that 'a' was correctly closed
end
--------------------------------------------------------------------------------
print'OK'
LITERALS¶
-- $Id: testes/literals.lua $
-- See Copyright Notice in file all.lua
print('testing scanner')
local debug = require "debug"
local function dostring (x) return assert(load(x), "")() end
dostring("x \v\f = \t\r 'a\0a' \v\f\f")
assert(x == 'a\0a' and string.len(x) == 3)
-- escape sequences
assert('\n\"\'\\' == [[
"'\]])
assert(string.find("\a\b\f\n\r\t\v", "^%c%c%c%c%c%c%c$"))
-- assume ASCII just for tests:
assert("\09912" == 'c12')
assert("\99ab" == 'cab')
assert("\099" == '\99')
assert("\099\n" == 'c\10')
assert('\0\0\0alo' == '\0' .. '\0\0' .. 'alo')
assert(010 .. 020 .. -030 == "1020-30")
-- hexadecimal escapes
assert("\x00\x05\x10\x1f\x3C\xfF\xe8" == "\0\5\16\31\60\255\232")
local function lexstring (x, y, n)
local f = assert(load('return ' .. x ..
', require"debug".getinfo(1).currentline', ''))
local s, l = f()
assert(s == y and l == n)
end
lexstring("'abc\\z \n efg'", "abcefg", 2)
lexstring("'abc\\z \n\n\n'", "abc", 4)
lexstring("'\\z \n\t\f\v\n'", "", 3)
lexstring("[[\nalo\nalo\n\n]]", "alo\nalo\n\n", 5)
lexstring("[[\nalo\ralo\n\n]]", "alo\nalo\n\n", 5)
lexstring("[[\nalo\ralo\r\n]]", "alo\nalo\n", 4)
lexstring("[[\ralo\n\ralo\r\n]]", "alo\nalo\n", 4)
lexstring("[[alo]\n]alo]]", "alo]\n]alo", 2)
assert("abc\z
def\z
ghi\z
" == 'abcdefghi')
-- UTF-8 sequences
assert("\u{0}\u{00000000}\x00\0" == string.char(0, 0, 0, 0))
-- limits for 1-byte sequences
assert("\u{0}\u{7F}" == "\x00\x7F")
-- limits for 2-byte sequences
assert("\u{80}\u{7FF}" == "\xC2\x80\xDF\xBF")
-- limits for 3-byte sequences
assert("\u{800}\u{FFFF}" == "\xE0\xA0\x80\xEF\xBF\xBF")
-- limits for 4-byte sequences
assert("\u{10000}\u{1FFFFF}" == "\xF0\x90\x80\x80\xF7\xBF\xBF\xBF")
-- limits for 5-byte sequences
assert("\u{200000}\u{3FFFFFF}" == "\xF8\x88\x80\x80\x80\xFB\xBF\xBF\xBF\xBF")
-- limits for 6-byte sequences
assert("\u{4000000}\u{7FFFFFFF}" ==
"\xFC\x84\x80\x80\x80\x80\xFD\xBF\xBF\xBF\xBF\xBF")
-- Error in escape sequences
local function lexerror (s, err)
local st, msg = load('return ' .. s, '')
if err ~= '<eof>' then err = err .. "'" end
assert(not st and string.find(msg, "near .-" .. err))
end
lexerror([["abc\x"]], [[\x"]])
lexerror([["abc\x]], [[\x]])
lexerror([["\x]], [[\x]])
lexerror([["\x5"]], [[\x5"]])
lexerror([["\x5]], [[\x5]])
lexerror([["\xr"]], [[\xr]])
lexerror([["\xr]], [[\xr]])
lexerror([["\x.]], [[\x.]])
lexerror([["\x8%"]], [[\x8%%]])
lexerror([["\xAG]], [[\xAG]])
lexerror([["\g"]], [[\g]])
lexerror([["\g]], [[\g]])
lexerror([["\."]], [[\%.]])
lexerror([["\999"]], [[\999"]])
lexerror([["xyz\300"]], [[\300"]])
lexerror([[" \256"]], [[\256"]])
-- errors in UTF-8 sequences
lexerror([["abc\u{100000000}"]], [[abc\u{100000000]]) -- too large
lexerror([["abc\u11r"]], [[abc\u1]]) -- missing '{'
lexerror([["abc\u"]], [[abc\u"]]) -- missing '{'
lexerror([["abc\u{11r"]], [[abc\u{11r]]) -- missing '}'
lexerror([["abc\u{11"]], [[abc\u{11"]]) -- missing '}'
lexerror([["abc\u{11]], [[abc\u{11]]) -- missing '}'
lexerror([["abc\u{r"]], [[abc\u{r]]) -- no digits
-- unfinished strings
lexerror("[=[alo]]", "<eof>")
lexerror("[=[alo]=", "<eof>")
lexerror("[=[alo]", "<eof>")
lexerror("'alo", "<eof>")
lexerror("'alo \\z \n\n", "<eof>")
lexerror("'alo \\z", "<eof>")
lexerror([['alo \98]], "<eof>")
-- valid characters in variable names
for i = 0, 255 do
local s = string.char(i)
assert(not string.find(s, "[a-zA-Z_]") == not load(s .. "=1", ""))
assert(not string.find(s, "[a-zA-Z_0-9]") ==
not load("a" .. s .. "1 = 1", ""))
end
-- long variable names
var1 = string.rep('a', 15000) .. '1'
var2 = string.rep('a', 15000) .. '2'
prog = string.format([[
%s = 5
%s = %s + 1
return function () return %s - %s end
]], var1, var2, var1, var1, var2)
local f = dostring(prog)
assert(_G[var1] == 5 and _G[var2] == 6 and f() == -1)
var1, var2, f = nil
print('+')
-- escapes --
assert("\n\t" == [[
]])
assert([[
$debug]] == "\n $debug")
assert([[ [ ]] ~= [[ ] ]])
-- long strings --
b = "001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789"
assert(string.len(b) == 960)
prog = [=[
print('+')
a1 = [["this is a 'string' with several 'quotes'"]]
a2 = "'quotes'"
assert(string.find(a1, a2) == 34)
print('+')
a1 = [==[temp = [[an arbitrary value]]; ]==]
assert(load(a1))()
assert(temp == 'an arbitrary value')
-- long strings --
b = "001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789001234567890123456789012345678901234567891234567890123456789012345678901234567890012345678901234567890123456789012345678912345678901234567890123456789012345678900123456789012345678901234567890123456789123456789012345678901234567890123456789"
assert(string.len(b) == 960)
print('+')
a = [[00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
00123456789012345678901234567890123456789123456789012345678901234567890123456789
]]
assert(string.len(a) == 1863)
assert(string.sub(a, 1, 40) == string.sub(b, 1, 40))
x = 1
]=]
print('+')
x = nil
dostring(prog)
assert(x)
prog = nil
a = nil
b = nil
-- testing line ends
prog = [[
a = 1 -- a comment
b = 2
x = [=[
hi
]=]
y = "\
hello\r\n\
"
return require"debug".getinfo(1).currentline
]]
for _, n in pairs{"\n", "\r", "\n\r", "\r\n"} do
local prog, nn = string.gsub(prog, "\n", n)
assert(dostring(prog) == nn)
assert(_G.x == "hi\n" and _G.y == "\nhello\r\n\n")
end
-- testing comments and strings with long brackets
a = [==[]=]==]
assert(a == "]=")
a = [==[[===[[=[]]=][====[]]===]===]==]
assert(a == "[===[[=[]]=][====[]]===]===")
a = [====[[===[[=[]]=][====[]]===]===]====]
assert(a == "[===[[=[]]=][====[]]===]===")
a = [=[]]]]]]]]]=]
assert(a == "]]]]]]]]")
--[===[
x y z [==[ blu foo
]==
]
]=]==]
error error]=]===]
-- generate all strings of four of these chars
local x = {"=", "[", "]", "\n"}
local len = 4
local function gen (c, n)
if n==0 then coroutine.yield(c)
else
for _, a in pairs(x) do
gen(c..a, n-1)
end
end
end
for s in coroutine.wrap(function () gen("", len) end) do
assert(s == load("return [====[\n"..s.."]====]", "")())
end
-- testing decimal point locale
if os.setlocale("pt_BR") or os.setlocale("ptb") then
assert(tonumber("3,4") == 3.4 and tonumber"3.4" == 3.4)
assert(tonumber(" -.4 ") == -0.4)
assert(tonumber(" +0x.41 ") == 0X0.41)
assert(not load("a = (3,4)"))
assert(assert(load("return 3.4"))() == 3.4)
assert(assert(load("return .4,3"))() == .4)
assert(assert(load("return 4."))() == 4.)
assert(assert(load("return 4.+.5"))() == 4.5)
assert(" 0x.1 " + " 0x,1" + "-0X.1\t" == 0x0.1)
assert(not tonumber"inf" and not tonumber"NAN")
assert(assert(load(string.format("return %q", 4.51)))() == 4.51)
local a,b = load("return 4.5.")
assert(string.find(b, "'4%.5%.'"))
assert(os.setlocale("C"))
else
(Message or print)(
'\n >>> pt_BR locale not available: skipping decimal point tests <<<\n')
end
-- testing %q x line ends
local s = "a string with \r and \n and \r\n and \n\r"
local c = string.format("return %q", s)
assert(assert(load(c))() == s)
-- testing errors
assert(not load"a = 'non-ending string")
assert(not load"a = 'non-ending string\n'")
assert(not load"a = '\\345'")
assert(not load"a = [=x]")
local function malformednum (n, exp)
local s, msg = load("return " .. n)
assert(not s and string.find(msg, exp))
end
malformednum("0xe-", "near <eof>")
malformednum("0xep-p", "malformed number")
malformednum("1print()", "malformed number")
print('OK')
LOCALS¶
-- $Id: testes/locals.lua $
-- See Copyright Notice in file all.lua
print('testing local variables and environments')
local debug = require"debug"
-- bug in 5.1:
local function f(x) x = nil; return x end
assert(f(10) == nil)
local function f() local x; return x end
assert(f(10) == nil)
local function f(x) x = nil; local y; return x, y end
assert(f(10) == nil and select(2, f(20)) == nil)
do
local i = 10
do local i = 100; assert(i==100) end
do local i = 1000; assert(i==1000) end
assert(i == 10)
if i ~= 10 then
local i = 20
else
local i = 30
assert(i == 30)
end
end
f = nil
local f
x = 1
a = nil
load('local a = {}')()
assert(a == nil)
function f (a)
local _1, _2, _3, _4, _5
local _6, _7, _8, _9, _10
local x = 3
local b = a
local c,d = a,b
if (d == b) then
local x = 'q'
x = b
assert(x == 2)
else
assert(nil)
end
assert(x == 3)
local f = 10
end
local b=10
local a; repeat local b; a,b=1,2; assert(a+1==b); until a+b==3
assert(x == 1)
f(2)
assert(type(f) == 'function')
local function getenv (f)
local a,b = debug.getupvalue(f, 1)
assert(a == '_ENV')
return b
end
-- test for global table of loaded chunks
assert(getenv(load"a=3") == _G)
local c = {}; local f = load("a = 3", nil, nil, c)
assert(getenv(f) == c)
assert(c.a == nil)
f()
assert(c.a == 3)
-- old test for limits for special instructions
do
local i = 2
local p = 4 -- p == 2^i
repeat
for j=-3,3 do
assert(load(string.format([[local a=%s;
a=a+%s;
assert(a ==2^%s)]], j, p-j, i), '')) ()
assert(load(string.format([[local a=%s;
a=a-%s;
assert(a==-2^%s)]], -j, p-j, i), '')) ()
assert(load(string.format([[local a,b=0,%s;
a=b-%s;
assert(a==-2^%s)]], -j, p-j, i), '')) ()
end
p = 2 * p; i = i + 1
until p <= 0
end
print'+'
if rawget(_G, "T") then
-- testing clearing of dead elements from tables
collectgarbage("stop") -- stop GC
local a = {[{}] = 4, [3] = 0, alo = 1,
a1234567890123456789012345678901234567890 = 10}
local t = T.querytab(a)
for k,_ in pairs(a) do a[k] = undef end
collectgarbage() -- restore GC and collect dead fields in 'a'
for i=0,t-1 do
local k = querytab(a, i)
assert(k == nil or type(k) == 'number' or k == 'alo')
end
-- testing allocation errors during table insertions
local a = {}
local function additems ()
a.x = true; a.y = true; a.z = true
a[1] = true
a[2] = true
end
for i = 1, math.huge do
T.alloccount(i)
local st, msg = pcall(additems)
T.alloccount()
local count = 0
for k, v in pairs(a) do
assert(a[k] == v)
count = count + 1
end
if st then assert(count == 5); break end
end
end
-- testing lexical environments
assert(_ENV == _G)
do
local dummy
local _ENV = (function (...) return ... end)(_G, dummy) -- {
do local _ENV = {assert=assert}; assert(true) end
mt = {_G = _G}
local foo,x
A = false -- "declare" A
do local _ENV = mt
function foo (x)
A = x
do local _ENV = _G; A = 1000 end
return function (x) return A .. x end
end
end
assert(getenv(foo) == mt)
x = foo('hi'); assert(mt.A == 'hi' and A == 1000)
assert(x('*') == mt.A .. '*')
do local _ENV = {assert=assert, A=10};
do local _ENV = {assert=assert, A=20};
assert(A==20);x=A
end
assert(A==10 and x==20)
end
assert(x==20)
do -- constants
local a<const>, b, c<const> = 10, 20, 30
b = a + c + b -- 'b' is not constant
assert(a == 10 and b == 60 and c == 30)
local function checkro (name, code)
local st, msg = load(code)
local gab = string.format("attempt to assign to const variable '%s'", name)
assert(not st and string.find(msg, gab))
end
checkro("y", "local x, y <const>, z = 10, 20, 30; x = 11; y = 12")
checkro("x", "local x <const>, y, z <const> = 10, 20, 30; x = 11")
checkro("z", "local x <const>, y, z <const> = 10, 20, 30; y = 10; z = 11")
checkro("z", [[
local a, z <const>, b = 10;
function foo() a = 20; z = 32; end
]])
checkro("var1", [[
local a, var1 <const> = 10;
function foo() a = 20; z = function () var1 = 12; end end
]])
end
print"testing to-be-closed variables"
local function stack(n) n = ((n == 0) or stack(n - 1)) end
local function func2close (f, x, y)
local obj = setmetatable({}, {__close = f})
if x then
return x, obj, y
else
return obj
end
end
do
local a = {}
do
local b <close> = false -- not to be closed
local x <close> = setmetatable({"x"}, {__close = function (self)
a[#a + 1] = self[1] end})
local w, y <close>, z = func2close(function (self, err)
assert(err == nil); a[#a + 1] = "y"
end, 10, 20)
local c <close> = nil -- not to be closed
a[#a + 1] = "in"
assert(w == 10 and z == 20)
end
a[#a + 1] = "out"
assert(a[1] == "in" and a[2] == "y" and a[3] == "x" and a[4] == "out")
end
do
local X = false
local x, closescope = func2close(function () stack(10); X = true end, 100)
assert(x == 100); x = 101; -- 'x' is not read-only
-- closing functions do not corrupt returning values
local function foo (x)
local _ <close> = closescope
return x, X, 23
end
local a, b, c = foo(1.5)
assert(a == 1.5 and b == false and c == 23 and X == true)
X = false
foo = function (x)
local _<close> = closescope
local y = 15
return y
end
assert(foo() == 15 and X == true)
X = false
foo = function ()
local x <close> = closescope
return x
end
assert(foo() == closescope and X == true)
end
-- testing to-be-closed x compile-time constants
-- (there were some bugs here in Lua 5.4-rc3, due to a confusion
-- between compile levels and stack levels of variables)
do
local flag = false
local x = setmetatable({},
{__close = function() assert(flag == false); flag = true end})
local y <const> = nil
local z <const> = nil
do
local a <close> = x
end
assert(flag) -- 'x' must be closed here
end
do
-- similar problem, but with implicit close in for loops
local flag = false
local x = setmetatable({},
{__close = function () assert(flag == false); flag = true end})
-- return an empty iterator, nil, nil, and 'x' to be closed
local function a ()
return (function () return nil end), nil, nil, x
end
local v <const> = 1
local w <const> = 1
local x <const> = 1
local y <const> = 1
local z <const> = 1
for k in a() do
a = k
end -- ending the loop must close 'x'
assert(flag) -- 'x' must be closed here
end
do
-- calls cannot be tail in the scope of to-be-closed variables
local X, Y
local function foo ()
local _ <close> = func2close(function () Y = 10 end)
assert(X == true and Y == nil) -- 'X' not closed yet
return 1,2,3
end
local function bar ()
local _ <close> = func2close(function () X = false end)
X = true
do
return foo() -- not a tail call!
end
end
local a, b, c, d = bar()
assert(a == 1 and b == 2 and c == 3 and X == false and Y == 10 and d == nil)
end
-- auxiliary functions for testing warnings in '__close'
local function prepwarn ()
if not T then -- no test library?
warn("@off") -- do not show (lots of) warnings
else
warn("@store") -- to test the warnings
end
end
local function endwarn ()
if not T then
warn("@on") -- back to normal
else
assert(_WARN == nil)
warn("@normal")
end
end
local function checkwarn (msg)
if T then
assert(string.find(_WARN, msg))
_WARN = nil -- reset variable to check next warning
end
end
warn("@on")
do print("testing errors in __close")
prepwarn()
-- original error is in __close
local function foo ()
local x <close> =
func2close(function (self, msg)
assert(string.find(msg, "@z"))
error("@x")
end)
local x1 <close> =
func2close(function (self, msg)
checkwarn("@y")
assert(string.find(msg, "@z"))
end)
local gc <close> = func2close(function () collectgarbage() end)
local y <close> =
func2close(function (self, msg)
assert(string.find(msg, "@z")) -- first error in 'z'
checkwarn("@z") -- second error in 'z' generated a warning
error("@y")
end)
local first = true
local z <close> =
-- 'z' close is called twice
func2close(function (self, msg)
if first then
assert(msg == nil)
first = false
else
assert(string.find(msg, "@z")) -- own error
end
error("@z")
end)
return 200
end
local stat, msg = pcall(foo, false)
assert(string.find(msg, "@z"))
checkwarn("@x")
-- original error not in __close
local function foo ()
local x <close> =
func2close(function (self, msg)
assert(msg == 4)
end)
local x1 <close> =
func2close(function (self, msg)
checkwarn("@y")
assert(msg == 4)
error("@x1")
end)
local gc <close> = func2close(function () collectgarbage() end)
local y <close> =
func2close(function (self, msg)
assert(msg == 4) -- error in body
checkwarn("@z")
error("@y")
end)
local first = true
local z <close> =
func2close(function (self, msg)
-- 'z' close is called once
assert(first and msg == 4)
first = false
error("@z")
end)
error(4) -- original error
end
local stat, msg = pcall(foo, true)
assert(msg == 4)
checkwarn("@x1") -- last error
-- error leaving a block
local function foo (...)
do
local x1 <close> =
func2close(function ()
checkwarn("@X")
error("@Y")
end)
local x123 <close> =
func2close(function ()
error("@X")
end)
end
os.exit(false) -- should not run
end
local st, msg = xpcall(foo, debug.traceback)
assert(string.match(msg, "^[^ ]* @X"))
assert(string.find(msg, "in metamethod 'close'"))
checkwarn("@Y")
-- error in toclose in vararg function
local function foo (...)
local x123 <close> = func2close(function () error("@x123") end)
end
local st, msg = xpcall(foo, debug.traceback)
assert(string.match(msg, "^[^ ]* @x123"))
assert(string.find(msg, "in metamethod 'close'"))
checkwarn("@x123") -- from second call to close 'x123'
endwarn()
end
do -- errors due to non-closable values
local function foo ()
local x <close> = {}
os.exit(false) -- should not run
end
local stat, msg = pcall(foo)
assert(not stat and
string.find(msg, "variable 'x' got a non%-closable value"))
local function foo ()
local xyz <close> = setmetatable({}, {__close = print})
getmetatable(xyz).__close = nil -- remove metamethod
end
local stat, msg = pcall(foo)
assert(not stat and
string.find(msg, "attempt to close non%-closable variable 'xyz'"))
end
if rawget(_G, "T") then
warn("@off")
-- memory error inside closing function
local function foo ()
local y <close> = func2close(function () T.alloccount() end)
local x <close> = setmetatable({}, {__close = function ()
T.alloccount(0); local x = {} -- force a memory error
end})
error(1000) -- common error inside the function's body
end
stack(5) -- ensure a minimal number of CI structures
-- despite memory error, 'y' will be executed and
-- memory limit will be lifted
local _, msg = pcall(foo)
assert(msg == 1000)
local close = func2close(function (self, msg)
T.alloccount()
assert(msg == "not enough memory")
end)
-- set a memory limit and return a closing object to remove the limit
local function enter (count)
stack(10) -- reserve some stack space
T.alloccount(count)
return close
end
local function test ()
local x <close> = enter(0) -- set a memory limit
-- creation of previous upvalue will raise a memory error
assert(false) -- should not run
end
local _, msg = pcall(test)
assert(msg == "not enough memory")
-- now use metamethod for closing
close = setmetatable({}, {__close = function ()
T.alloccount()
end})
-- repeat test with extra closing upvalues
local function test ()
local xxx <close> = func2close(function (self, msg)
assert(msg == "not enough memory");
error(1000) -- raise another error
end)
local xx <close> = func2close(function (self, msg)
assert(msg == "not enough memory");
end)
local x <close> = enter(0) -- set a memory limit
-- creation of previous upvalue will raise a memory error
os.exit(false) -- should not run
end
local _, msg = pcall(test)
assert(msg == "not enough memory") -- reported error is the first one
do -- testing 'toclose' in C string buffer
collectgarbage()
local s = string.rep('a', 10000) -- large string
local m = T.totalmem()
collectgarbage("stop")
s = string.upper(s) -- allocate buffer + new string (10K each)
-- ensure buffer was deallocated
assert(T.totalmem() - m <= 11000)
collectgarbage("restart")
end
do -- now some tests for freeing buffer in case of errors
local lim = 10000 -- some size larger than the static buffer
local extra = 2000 -- some extra memory (for callinfo, etc.)
local s = string.rep("a", lim)
-- concat this table needs two buffer resizes (one for each 's')
local a = {s, s}
collectgarbage()
m = T.totalmem()
collectgarbage("stop")
-- error in the first buffer allocation
T. totalmem(m + extra)
assert(not pcall(table.concat, a))
-- first buffer was not even allocated
assert(T.totalmem() - m <= extra)
-- error in the second buffer allocation
T. totalmem(m + lim + extra)
assert(not pcall(table.concat, a))
-- first buffer was released by 'toclose'
assert(T.totalmem() - m <= extra)
-- error in creation of final string
T.totalmem(m + 2 * lim + extra)
assert(not pcall(table.concat, a))
-- second buffer was released by 'toclose'
assert(T.totalmem() - m <= extra)
-- userdata, upvalue, buffer, buffer, final string
T.totalmem(m + 4*lim + extra)
assert(#table.concat(a) == 2*lim)
T.totalmem(0) -- remove memory limit
collectgarbage("restart")
print'+'
end
warn("@on")
end
print "to-be-closed variables in coroutines"
do
-- an error in a wrapped coroutine closes variables
local x = false
local y = false
local co = coroutine.wrap(function ()
local xv <close> = func2close(function () x = true end)
do
local yv <close> = func2close(function () y = true end)
coroutine.yield(100) -- yield doesn't close variable
end
coroutine.yield(200) -- yield doesn't close variable
error(23) -- error does
end)
local b = co()
assert(b == 100 and not x and not y)
b = co()
assert(b == 200 and not x and y)
local a, b = pcall(co)
assert(not a and b == 23 and x and y)
end
do
prepwarn()
-- error in a wrapped coroutine raising errors when closing a variable
local x = 0
local co = coroutine.wrap(function ()
local xx <close> = func2close(function () x = x + 1; error("@YYY") end)
local xv <close> = func2close(function () x = x + 1; error("@XXX") end)
coroutine.yield(100)
error(200)
end)
assert(co() == 100); assert(x == 0)
local st, msg = pcall(co); assert(x == 2)
assert(not st and msg == 200) -- should get first error raised
checkwarn("@YYY")
local x = 0
local y = 0
co = coroutine.wrap(function ()
local xx <close> = func2close(function () y = y + 1; error("YYY") end)
local xv <close> = func2close(function () x = x + 1; error("XXX") end)
coroutine.yield(100)
return 200
end)
assert(co() == 100); assert(x == 0)
local st, msg = pcall(co)
assert(x == 2 and y == 1) -- first close is called twice
-- should get first error raised
assert(not st and string.find(msg, "%w+%.%w+:%d+: XXX"))
checkwarn("YYY")
endwarn()
end
-- a suspended coroutine should not close its variables when collected
local co
co = coroutine.wrap(function()
-- should not run
local x <close> = func2close(function () os.exit(false) end)
co = nil
coroutine.yield()
end)
co() -- start coroutine
assert(co == nil) -- eventually it will be collected
collectgarbage()
-- to-be-closed variables in generic for loops
do
local numopen = 0
local function open (x)
numopen = numopen + 1
return
function () -- iteraction function
x = x - 1
if x > 0 then return x end
end,
nil, -- state
nil, -- control variable
func2close(function () numopen = numopen - 1 end) -- closing function
end
local s = 0
for i in open(10) do
s = s + i
end
assert(s == 45 and numopen == 0)
local s = 0
for i in open(10) do
if i < 5 then break end
s = s + i
end
assert(s == 35 and numopen == 0)
local s = 0
for i in open(10) do
for j in open(10) do
if i + j < 5 then goto endloop end
s = s + i
end
end
::endloop::
assert(s == 375 and numopen == 0)
end
print('OK')
return 5,f
end -- }
MAIN¶
# testing special comment on first line
-- $Id: testes/main.lua $
-- See Copyright Notice in file all.lua
-- most (all?) tests here assume a reasonable "Unix-like" shell
if _port then return end
-- use only "double quotes" inside shell scripts (better change to
-- run on Windows)
print ("testing stand-alone interpreter")
assert(os.execute()) -- machine has a system command
local arg = arg or ARG
local prog = os.tmpname()
local otherprog = os.tmpname()
local out = os.tmpname()
local progname
do
local i = 0
while arg[i] do i=i-1 end
progname = arg[i+1]
end
print("progname: "..progname)
local prepfile = function (s, p)
p = p or prog
io.output(p)
io.write(s)
assert(io.close())
end
local function getoutput ()
io.input(out)
local t = io.read("a")
io.input():close()
assert(os.remove(out))
return t
end
local function checkprogout (s)
-- expected result must end with new line
assert(string.sub(s, -1) == "\n")
local t = getoutput()
for line in string.gmatch(s, ".-\n") do
assert(string.find(t, line, 1, true))
end
end
local function checkout (s)
local t = getoutput()
if s ~= t then print(string.format("'%s' - '%s'\n", s, t)) end
assert(s == t)
return t
end
local function RUN (p, ...)
p = string.gsub(p, "lua", '"'..progname..'"', 1)
local s = string.format(p, ...)
assert(os.execute(s))
end
local function NoRun (msg, p, ...)
p = string.gsub(p, "lua", '"'..progname..'"', 1)
local s = string.format(p, ...)
s = string.format("%s 2> %s", s, out) -- will send error to 'out'
assert(not os.execute(s))
assert(string.find(getoutput(), msg, 1, true)) -- check error message
end
RUN('lua -v')
print(string.format("(temporary program file used in these tests: %s)", prog))
-- running stdin as a file
prepfile""
RUN('lua - < %s > %s', prog, out)
checkout("")
prepfile[[
print(
1, a
)
]]
RUN('lua - < %s > %s', prog, out)
checkout("1\tnil\n")
RUN('echo "print(10)\nprint(2)\n" | lua > %s', out)
checkout("10\n2\n")
-- test option '-'
RUN('echo "print(arg[1])" | lua - -h > %s', out)
checkout("-h\n")
-- test environment variables used by Lua
prepfile("print(package.path)")
-- test LUA_PATH
RUN('env LUA_INIT= LUA_PATH=x lua %s > %s', prog, out)
checkout("x\n")
-- test LUA_PATH_version
RUN('env LUA_INIT= LUA_PATH_5_4=y LUA_PATH=x lua %s > %s', prog, out)
checkout("y\n")
-- test LUA_CPATH
prepfile("print(package.cpath)")
RUN('env LUA_INIT= LUA_CPATH=xuxu lua %s > %s', prog, out)
checkout("xuxu\n")
-- test LUA_CPATH_version
RUN('env LUA_INIT= LUA_CPATH_5_4=yacc LUA_CPATH=x lua %s > %s', prog, out)
checkout("yacc\n")
-- test LUA_INIT (and its access to 'arg' table)
prepfile("print(X)")
RUN('env LUA_INIT="X=tonumber(arg[1])" lua %s 3.2 > %s', prog, out)
checkout("3.2\n")
-- test LUA_INIT_version
prepfile("print(X)")
RUN('env LUA_INIT_5_4="X=10" LUA_INIT="X=3" lua %s > %s', prog, out)
checkout("10\n")
-- test LUA_INIT for files
prepfile("x = x or 10; print(x); x = x + 1")
RUN('env LUA_INIT="@%s" lua %s > %s', prog, prog, out)
checkout("10\n11\n")
-- test errors in LUA_INIT
NoRun('LUA_INIT:1: msg', 'env LUA_INIT="error(\'msg\')" lua')
-- test option '-E'
local defaultpath, defaultCpath
do
prepfile("print(package.path, package.cpath)")
RUN('env LUA_INIT="error(10)" LUA_PATH=xxx LUA_CPATH=xxx lua -E %s > %s',
prog, out)
local output = getoutput()
defaultpath = string.match(output, "^(.-)\t")
defaultCpath = string.match(output, "\t(.-)$")
-- running with an empty environment
-- native Lua: Do not run this test on Travis CI/Azure Pipelines/...
if (os.getenv("NATIVE_LUA_CI_BUILD") ~= "TRUE") then
RUN('env -i lua %s > %s', prog, out)
local out = getoutput()
assert(defaultpath == string.match(output, "^(.-)\t"))
assert(defaultCpath == string.match(output, "\t(.-)$"))
end
end
-- paths did not change
assert(not string.find(defaultpath, "xxx") and
string.find(defaultpath, "lua") and
not string.find(defaultCpath, "xxx") and
string.find(defaultCpath, "lua"))
-- test replacement of ';;' to default path
local function convert (p)
prepfile("print(package.path)")
RUN('env LUA_PATH="%s" lua %s > %s', p, prog, out)
local expected = getoutput()
expected = string.sub(expected, 1, -2) -- cut final end of line
if string.find(p, ";;") then
p = string.gsub(p, ";;", ";"..defaultpath..";")
p = string.gsub(p, "^;", "") -- remove ';' at the beginning
p = string.gsub(p, ";$", "") -- remove ';' at the end
end
assert(p == expected)
end
convert(";")
convert(";;")
convert("a;;b")
convert(";;b")
convert("a;;")
convert("a;b;;c")
-- test -l over multiple libraries
prepfile("print(1); a=2; return {x=15}")
prepfile(("print(a); print(_G['%s'].x)"):format(prog), otherprog)
RUN('env LUA_PATH="?;;" lua -l %s -l%s -lstring -l io %s > %s', prog, otherprog, otherprog, out)
checkout("1\n2\n15\n2\n15\n")
-- test 'arg' table
local a = [[
assert(#arg == 3 and arg[1] == 'a' and
arg[2] == 'b' and arg[3] == 'c')
assert(arg[-1] == '--' and arg[-2] == "-e " and arg[-3] == '%s')
assert(arg[4] == undef and arg[-4] == undef)
local a, b, c = ...
assert(... == 'a' and a == 'a' and b == 'b' and c == 'c')
]]
a = string.format(a, progname)
prepfile(a)
RUN('lua "-e " -- %s a b c', prog) -- "-e " runs an empty command
-- test 'arg' availability in libraries
prepfile"assert(arg)"
prepfile("assert(arg)", otherprog)
RUN('env LUA_PATH="?;;" lua -l%s - < %s', prog, otherprog)
-- test messing up the 'arg' table
RUN('echo "print(...)" | lua -e "arg[1] = 100" - > %s', out)
checkout("100\n")
NoRun("'arg' is not a table", 'echo "" | lua -e "arg = 1" -')
-- test error in 'print'
RUN('echo 10 | lua -e "print=nil" -i > /dev/null 2> %s', out)
assert(string.find(getoutput(), "error calling 'print'"))
-- test 'debug.debug'
RUN('echo "io.stderr:write(1000)\ncont" | lua -e "require\'debug\'.debug()" 2> %s', out)
checkout("lua_debug> 1000lua_debug> ")
print("testing warnings")
-- no warnings by default
RUN('echo "io.stderr:write(1); warn[[XXX]]" | lua 2> %s', out)
checkout("1")
prepfile[[
warn("@allow") -- unknown control, ignored
warn("@off", "XXX", "@off") -- these are not control messages
warn("@off") -- this one is
warn("@on", "YYY", "@on") -- not control, but warn is off
warn("@off") -- keep it off
warn("@on") -- restart warnings
warn("", "@on") -- again, no control, real warning
warn("@on") -- keep it "started"
warn("Z", "Z", "Z") -- common warning
]]
RUN('lua -W %s 2> %s', prog, out)
checkout[[
Lua warning: @offXXX@off
Lua warning: @on
Lua warning: ZZZ
]]
prepfile[[
warn("@allow")
-- create two objects to be finalized when closing state
-- the errors in the finalizers must generate warnings
u1 = setmetatable({}, {__gc = function () error("XYZ") end})
u2 = setmetatable({}, {__gc = function () error("ZYX") end})
]]
RUN('lua -W %s 2> %s', prog, out)
checkprogout("ZYX)\nXYZ)\n")
-- test many arguments
prepfile[[print(({...})[30])]]
RUN('lua %s %s > %s', prog, string.rep(" a", 30), out)
checkout("a\n")
RUN([[lua "-eprint(1)" -ea=3 -e "print(a)" > %s]], out)
checkout("1\n3\n")
-- test iteractive mode
prepfile[[
(6*2-6) -- ===
a =
10
print(a)
a]]
RUN([[lua -e"_PROMPT='' _PROMPT2=''" -i < %s > %s]], prog, out)
checkprogout("6\n10\n10\n\n")
prepfile("a = [[b\nc\nd\ne]]\n=a")
RUN([[lua -e"_PROMPT='' _PROMPT2=''" -i < %s > %s]], prog, out)
checkprogout("b\nc\nd\ne\n\n")
prompt = "alo"
prepfile[[ --
a = 2
]]
RUN([[lua "-e_PROMPT='%s'" -i < %s > %s]], prompt, prog, out)
local t = getoutput()
assert(string.find(t, prompt .. ".*" .. prompt .. ".*" .. prompt))
-- test for error objects
prepfile[[
debug = require "debug"
m = {x=0}
setmetatable(m, {__tostring = function(x)
return tostring(debug.getinfo(4).currentline + x.x)
end})
error(m)
]]
NoRun(progname .. ": 6\n", [[lua %s]], prog)
prepfile("error{}")
NoRun("error object is a table value", [[lua %s]], prog)
-- chunk broken in many lines
s = [=[ --
function f ( x )
local a = [[
xuxu
]]
local b = "\
xuxu\n"
if x == 11 then return 1 + 12 , 2 + 20 end --[[ test multiple returns ]]
return x + 1
--\\
end
return( f( 100 ) )
assert( a == b )
do return f( 11 ) end ]=]
s = string.gsub(s, ' ', '\n\n') -- change all spaces for newlines
prepfile(s)
RUN([[lua -e"_PROMPT='' _PROMPT2=''" -i < %s > %s]], prog, out)
checkprogout("101\n13\t22\n\n")
prepfile[[#comment in 1st line without \n at the end]]
RUN('lua %s', prog)
prepfile[[#test line number when file starts with comment line
debug = require"debug"
print(debug.getinfo(1).currentline)
]]
RUN('lua %s > %s', prog, out)
checkprogout('3\n')
-- close Lua with an open file
prepfile(string.format([[io.output(%q); io.write('alo')]], out))
RUN('lua %s', prog)
checkout('alo')
-- bug in 5.2 beta (extra \0 after version line)
RUN([[lua -v -e"print'hello'" > %s]], out)
t = getoutput()
assert(string.find(t, "native%-lua]\nhello")) -- native Lua
-- testing os.exit
prepfile("os.exit(nil, true)")
RUN('lua %s', prog)
prepfile("os.exit(0, true)")
RUN('lua %s', prog)
prepfile("os.exit(true, true)")
RUN('lua %s', prog)
prepfile("os.exit(1, true)")
NoRun("", "lua %s", prog) -- no message
prepfile("os.exit(false, true)")
NoRun("", "lua %s", prog) -- no message
-- to-be-closed variables in main chunk
prepfile[[
local x <close> = setmetatable({},
{__close = function (self, err)
assert(err == nil)
print("Ok")
end})
local e1 <close> = setmetatable({}, {__close = function () print(120) end})
os.exit(true, true)
]]
RUN('lua %s > %s', prog, out)
checkprogout("120\nOk\n")
-- remove temporary files
assert(os.remove(prog))
assert(os.remove(otherprog))
assert(not os.remove(out))
-- invalid options
NoRun("unrecognized option '-h'", "lua -h")
NoRun("unrecognized option '---'", "lua ---")
NoRun("unrecognized option '-Ex'", "lua -Ex")
NoRun("unrecognized option '-vv'", "lua -vv")
NoRun("unrecognized option '-iv'", "lua -iv")
NoRun("'-e' needs argument", "lua -e")
NoRun("syntax error", "lua -e a")
NoRun("'-l' needs argument", "lua -l")
if T then -- test library?
print("testing 'not enough memory' to create a state")
NoRun("not enough memory", "env MEMLIMIT=100 lua")
-- testing 'warn'
warn("@store")
warn("@123", "456", "789")
assert(_WARN == "@123456789"); _WARN = nil
warn("zip", "", " ", "zap")
assert(_WARN == "zip zap"); _WARN = nil
warn("ZIP", "", " ", "ZAP")
assert(_WARN == "ZIP ZAP"); _WARN = nil
warn("@normal")
end
do
-- 'warn' must get at least one argument
local st, msg = pcall(warn)
assert(string.find(msg, "string expected"))
-- 'warn' does not leave unfinished warning in case of errors
-- (message would appear in next warning)
st, msg = pcall(warn, "SHOULD NOT APPEAR", {})
assert(string.find(msg, "string expected"))
end
print('+')
print('testing Ctrl C')
do
-- interrupt a script
local function kill (pid)
return os.execute(string.format('kill -INT %s 2> /dev/null', pid))
end
-- function to run a script in background, returning its output file
-- descriptor and its pid
local function runback (luaprg)
-- shell script to run 'luaprg' in background and echo its pid
local shellprg = string.format('%s -e "%s" & echo $!', progname, luaprg)
local f = io.popen(shellprg, "r") -- run shell script
local pid = f:read() -- get pid for Lua script
print("(if test fails now, it may leave a Lua script running in \z
background, pid " .. pid .. ")")
return f, pid
end
-- Lua script that runs protected infinite loop and then prints '42'
local f, pid = runback[[
pcall(function () print(12); while true do end end); print(42)]]
-- wait until script is inside 'pcall'
assert(f:read() == "12")
kill(pid) -- send INT signal to Lua script
-- check that 'pcall' captured the exception and script continued running
assert(f:read() == "42") -- expected output
assert(f:close())
print("done")
-- Lua script in a long unbreakable search
local f, pid = runback[[
print(15); string.find(string.rep('a', 100000), '.*b')]]
-- wait (so script can reach the loop)
assert(f:read() == "15")
assert(os.execute("sleep 1"))
-- must send at least two INT signals to stop this Lua script
local n = 100
for i = 0, 100 do -- keep sending signals
if not kill(pid) then -- until it fails
n = i -- number of non-failed kills
break
end
end
assert(f:close())
assert(n >= 2)
print(string.format("done (with %d kills)", n))
end
print("OK")
MATH¶
-- $Id: testes/math.lua $
-- See Copyright Notice in file all.lua
print("testing numbers and math lib")
local minint <const> = math.mininteger
local maxint <const> = math.maxinteger
local intbits <const> = math.floor(math.log(maxint, 2) + 0.5) + 1
assert((1 << intbits) == 0)
assert(minint == 1 << (intbits - 1))
assert(maxint == minint - 1)
-- number of bits in the mantissa of a floating-point number
local floatbits = 24
do
local p = 2.0^floatbits
while p < p + 1.0 do
p = p * 2.0
floatbits = floatbits + 1
end
end
local function isNaN (x)
return (x ~= x)
end
assert(isNaN(0/0))
assert(not isNaN(1/0))
do
local x = 2.0^floatbits
assert(x > x - 1.0 and x == x + 1.0)
print(string.format("%d-bit integers, %d-bit (mantissa) floats",
intbits, floatbits))
end
assert(math.type(0) == "integer" and math.type(0.0) == "float"
and not math.type("10"))
local function checkerror (msg, f, ...)
local s, err = pcall(f, ...)
assert(not s and string.find(err, msg))
end
local msgf2i = "number.* has no integer representation"
-- float equality
function eq (a,b,limit)
if not limit then
if floatbits >= 50 then limit = 1E-11
else limit = 1E-5
end
end
-- a == b needed for +inf/-inf
return a == b or math.abs(a-b) <= limit
end
-- equality with types
function eqT (a,b)
return a == b and math.type(a) == math.type(b)
end
-- basic float notation
assert(0e12 == 0 and .0 == 0 and 0. == 0 and .2e2 == 20 and 2.E-1 == 0.2)
do
local a,b,c = "2", " 3e0 ", " 10 "
assert(a+b == 5 and -b == -3 and b+"2" == 5 and "10"-c == 0)
assert(type(a) == 'string' and type(b) == 'string' and type(c) == 'string')
assert(a == "2" and b == " 3e0 " and c == " 10 " and -c == -" 10 ")
assert(c%a == 0 and a^b == 08)
a = 0
assert(a == -a and 0 == -0)
end
do
local x = -1
local mz = 0/x -- minus zero
t = {[0] = 10, 20, 30, 40, 50}
assert(t[mz] == t[0] and t[-0] == t[0])
end
do -- tests for 'modf'
local a,b = math.modf(3.5)
assert(a == 3.0 and b == 0.5)
a,b = math.modf(-2.5)
assert(a == -2.0 and b == -0.5)
a,b = math.modf(-3e23)
assert(a == -3e23 and b == 0.0)
a,b = math.modf(3e35)
assert(a == 3e35 and b == 0.0)
a,b = math.modf(-1/0) -- -inf
assert(a == -1/0 and b == 0.0)
a,b = math.modf(1/0) -- inf
assert(a == 1/0 and b == 0.0)
a,b = math.modf(0/0) -- NaN
assert(isNaN(a) and isNaN(b))
a,b = math.modf(3) -- integer argument
assert(eqT(a, 3) and eqT(b, 0.0))
a,b = math.modf(minint)
assert(eqT(a, minint) and eqT(b, 0.0))
end
assert(math.huge > 10e30)
assert(-math.huge < -10e30)
-- integer arithmetic
assert(minint < minint + 1)
assert(maxint - 1 < maxint)
assert(0 - minint == minint)
assert(minint * minint == 0)
assert(maxint * maxint * maxint == maxint)
-- testing floor division and conversions
for _, i in pairs{-16, -15, -3, -2, -1, 0, 1, 2, 3, 15} do
for _, j in pairs{-16, -15, -3, -2, -1, 1, 2, 3, 15} do
for _, ti in pairs{0, 0.0} do -- try 'i' as integer and as float
for _, tj in pairs{0, 0.0} do -- try 'j' as integer and as float
local x = i + ti
local y = j + tj
assert(i//j == math.floor(i/j))
end
end
end
end
assert(1//0.0 == 1/0)
assert(-1 // 0.0 == -1/0)
assert(eqT(3.5 // 1.5, 2.0))
assert(eqT(3.5 // -1.5, -3.0))
do -- tests for different kinds of opcodes
local x, y
x = 1; assert(x // 0.0 == 1/0)
x = 1.0; assert(x // 0 == 1/0)
x = 3.5; assert(eqT(x // 1, 3.0))
assert(eqT(x // -1, -4.0))
x = 3.5; y = 1.5; assert(eqT(x // y, 2.0))
x = 3.5; y = -1.5; assert(eqT(x // y, -3.0))
end
assert(maxint // maxint == 1)
assert(maxint // 1 == maxint)
assert((maxint - 1) // maxint == 0)
assert(maxint // (maxint - 1) == 1)
assert(minint // minint == 1)
assert(minint // minint == 1)
assert((minint + 1) // minint == 0)
assert(minint // (minint + 1) == 1)
assert(minint // 1 == minint)
assert(minint // -1 == -minint)
assert(minint // -2 == 2^(intbits - 2))
assert(maxint // -1 == -maxint)
-- negative exponents
do
assert(2^-3 == 1 / 2^3)
assert(eq((-3)^-3, 1 / (-3)^3))
for i = -3, 3 do -- variables avoid constant folding
for j = -3, 3 do
-- domain errors (0^(-n)) are not portable
if not _port or i ~= 0 or j > 0 then
assert(eq(i^j, 1 / i^(-j)))
end
end
end
end
-- comparison between floats and integers (border cases)
if floatbits < intbits then
assert(2.0^floatbits == (1 << floatbits))
assert(2.0^floatbits - 1.0 == (1 << floatbits) - 1.0)
assert(2.0^floatbits - 1.0 ~= (1 << floatbits))
-- float is rounded, int is not
assert(2.0^floatbits + 1.0 ~= (1 << floatbits) + 1)
else -- floats can express all integers with full accuracy
assert(maxint == maxint + 0.0)
assert(maxint - 1 == maxint - 1.0)
assert(minint + 1 == minint + 1.0)
assert(maxint ~= maxint - 1.0)
end
assert(maxint + 0.0 == 2.0^(intbits - 1) - 1.0)
assert(minint + 0.0 == minint)
assert(minint + 0.0 == -2.0^(intbits - 1))
-- order between floats and integers
assert(1 < 1.1); assert(not (1 < 0.9))
assert(1 <= 1.1); assert(not (1 <= 0.9))
assert(-1 < -0.9); assert(not (-1 < -1.1))
assert(1 <= 1.1); assert(not (-1 <= -1.1))
assert(-1 < -0.9); assert(not (-1 < -1.1))
assert(-1 <= -0.9); assert(not (-1 <= -1.1))
assert(minint <= minint + 0.0)
assert(minint + 0.0 <= minint)
assert(not (minint < minint + 0.0))
assert(not (minint + 0.0 < minint))
assert(maxint < minint * -1.0)
assert(maxint <= minint * -1.0)
do
local fmaxi1 = 2^(intbits - 1)
assert(maxint < fmaxi1)
assert(maxint <= fmaxi1)
assert(not (fmaxi1 <= maxint))
assert(minint <= -2^(intbits - 1))
assert(-2^(intbits - 1) <= minint)
end
if floatbits < intbits then
print("testing order (floats cannot represent all integers)")
local fmax = 2^floatbits
local ifmax = fmax | 0
assert(fmax < ifmax + 1)
assert(fmax - 1 < ifmax)
assert(-(fmax - 1) > -ifmax)
assert(not (fmax <= ifmax - 1))
assert(-fmax > -(ifmax + 1))
assert(not (-fmax >= -(ifmax - 1)))
assert(fmax/2 - 0.5 < ifmax//2)
assert(-(fmax/2 - 0.5) > -ifmax//2)
assert(maxint < 2^intbits)
assert(minint > -2^intbits)
assert(maxint <= 2^intbits)
assert(minint >= -2^intbits)
else
print("testing order (floats can represent all integers)")
assert(maxint < maxint + 1.0)
assert(maxint < maxint + 0.5)
assert(maxint - 1.0 < maxint)
assert(maxint - 0.5 < maxint)
assert(not (maxint + 0.0 < maxint))
assert(maxint + 0.0 <= maxint)
assert(not (maxint < maxint + 0.0))
assert(maxint + 0.0 <= maxint)
assert(maxint <= maxint + 0.0)
assert(not (maxint + 1.0 <= maxint))
assert(not (maxint + 0.5 <= maxint))
assert(not (maxint <= maxint - 1.0))
assert(not (maxint <= maxint - 0.5))
assert(minint < minint + 1.0)
assert(minint < minint + 0.5)
assert(minint <= minint + 0.5)
assert(minint - 1.0 < minint)
assert(minint - 1.0 <= minint)
assert(not (minint + 0.0 < minint))
assert(not (minint + 0.5 < minint))
assert(not (minint < minint + 0.0))
assert(minint + 0.0 <= minint)
assert(minint <= minint + 0.0)
assert(not (minint + 1.0 <= minint))
assert(not (minint + 0.5 <= minint))
assert(not (minint <= minint - 1.0))
end
do
local NaN <const> = 0/0
assert(not (NaN < 0))
assert(not (NaN > minint))
assert(not (NaN <= -9))
assert(not (NaN <= maxint))
assert(not (NaN < maxint))
assert(not (minint <= NaN))
assert(not (minint < NaN))
assert(not (4 <= NaN))
assert(not (4 < NaN))
end
-- avoiding errors at compile time
local function checkcompt (msg, code)
checkerror(msg, assert(load(code)))
end
checkcompt("divide by zero", "return 2 // 0")
checkcompt(msgf2i, "return 2.3 >> 0")
checkcompt(msgf2i, ("return 2.0^%d & 1"):format(intbits - 1))
checkcompt("field 'huge'", "return math.huge << 1")
checkcompt(msgf2i, ("return 1 | 2.0^%d"):format(intbits - 1))
checkcompt(msgf2i, "return 2.3 ~ 0.0")
-- testing overflow errors when converting from float to integer (runtime)
local function f2i (x) return x | x end
checkerror(msgf2i, f2i, math.huge) -- +inf
checkerror(msgf2i, f2i, -math.huge) -- -inf
checkerror(msgf2i, f2i, 0/0) -- NaN
if floatbits < intbits then
-- conversion tests when float cannot represent all integers
assert(maxint + 1.0 == maxint + 0.0)
assert(minint - 1.0 == minint + 0.0)
checkerror(msgf2i, f2i, maxint + 0.0)
assert(f2i(2.0^(intbits - 2)) == 1 << (intbits - 2))
assert(f2i(-2.0^(intbits - 2)) == -(1 << (intbits - 2)))
assert((2.0^(floatbits - 1) + 1.0) // 1 == (1 << (floatbits - 1)) + 1)
-- maximum integer representable as a float
local mf = maxint - (1 << (floatbits - intbits)) + 1
assert(f2i(mf + 0.0) == mf) -- OK up to here
mf = mf + 1
assert(f2i(mf + 0.0) ~= mf) -- no more representable
else
-- conversion tests when float can represent all integers
assert(maxint + 1.0 > maxint)
assert(minint - 1.0 < minint)
assert(f2i(maxint + 0.0) == maxint)
checkerror("no integer rep", f2i, maxint + 1.0)
checkerror("no integer rep", f2i, minint - 1.0)
end
-- 'minint' should be representable as a float no matter the precision
assert(f2i(minint + 0.0) == minint)
-- testing numeric strings
assert("2" + 1 == 3)
assert("2 " + 1 == 3)
assert(" -2 " + 1 == -1)
assert(" -0xa " + 1 == -9)
-- Literal integer Overflows (new behavior in 5.3.3)
do
-- no overflows
assert(eqT(tonumber(tostring(maxint)), maxint))
assert(eqT(tonumber(tostring(minint)), minint))
-- add 1 to last digit as a string (it cannot be 9...)
local function incd (n)
local s = string.format("%d", n)
s = string.gsub(s, "%d$", function (d)
assert(d ~= '9')
return string.char(string.byte(d) + 1)
end)
return s
end
-- 'tonumber' with overflow by 1
assert(eqT(tonumber(incd(maxint)), maxint + 1.0))
assert(eqT(tonumber(incd(minint)), minint - 1.0))
-- large numbers
assert(eqT(tonumber("1"..string.rep("0", 30)), 1e30))
assert(eqT(tonumber("-1"..string.rep("0", 30)), -1e30))
-- hexa format still wraps around
assert(eqT(tonumber("0x1"..string.rep("0", 30)), 0))
-- lexer in the limits
assert(minint == load("return " .. minint)())
assert(eqT(maxint, load("return " .. maxint)()))
assert(eqT(10000000000000000000000.0, 10000000000000000000000))
assert(eqT(-10000000000000000000000.0, -10000000000000000000000))
end
-- testing 'tonumber'
-- 'tonumber' with numbers
assert(tonumber(3.4) == 3.4)
assert(eqT(tonumber(3), 3))
assert(eqT(tonumber(maxint), maxint) and eqT(tonumber(minint), minint))
assert(tonumber(1/0) == 1/0)
-- 'tonumber' with strings
assert(tonumber("0") == 0)
assert(not tonumber(""))
assert(not tonumber(" "))
assert(not tonumber("-"))
assert(not tonumber(" -0x "))
assert(not tonumber{})
assert(tonumber'+0.01' == 1/100 and tonumber'+.01' == 0.01 and
tonumber'.01' == 0.01 and tonumber'-1.' == -1 and
tonumber'+1.' == 1)
assert(not tonumber'+ 0.01' and not tonumber'+.e1' and
not tonumber'1e' and not tonumber'1.0e+' and
not tonumber'.')
assert(tonumber('-012') == -010-2)
assert(tonumber('-1.2e2') == - - -120)
assert(tonumber("0xffffffffffff") == (1 << (4*12)) - 1)
assert(tonumber("0x"..string.rep("f", (intbits//4))) == -1)
assert(tonumber("-0x"..string.rep("f", (intbits//4))) == 1)
-- testing 'tonumber' with base
assert(tonumber(' 001010 ', 2) == 10)
assert(tonumber(' 001010 ', 10) == 001010)
assert(tonumber(' -1010 ', 2) == -10)
assert(tonumber('10', 36) == 36)
assert(tonumber(' -10 ', 36) == -36)
assert(tonumber(' +1Z ', 36) == 36 + 35)
assert(tonumber(' -1z ', 36) == -36 + -35)
assert(tonumber('-fFfa', 16) == -(10+(16*(15+(16*(15+(16*15)))))))
assert(tonumber(string.rep('1', (intbits - 2)), 2) + 1 == 2^(intbits - 2))
assert(tonumber('ffffFFFF', 16)+1 == (1 << 32))
assert(tonumber('0ffffFFFF', 16)+1 == (1 << 32))
assert(tonumber('-0ffffffFFFF', 16) - 1 == -(1 << 40))
for i = 2,36 do
local i2 = i * i
local i10 = i2 * i2 * i2 * i2 * i2 -- i^10
assert(tonumber('\t10000000000\t', i) == i10)
end
if not _soft then
-- tests with very long numerals
assert(tonumber("0x"..string.rep("f", 13)..".0") == 2.0^(4*13) - 1)
assert(tonumber("0x"..string.rep("f", 150)..".0") == 2.0^(4*150) - 1)
assert(tonumber("0x"..string.rep("f", 300)..".0") == 2.0^(4*300) - 1)
assert(tonumber("0x"..string.rep("f", 500)..".0") == 2.0^(4*500) - 1)
assert(tonumber('0x3.' .. string.rep('0', 1000)) == 3)
assert(tonumber('0x' .. string.rep('0', 1000) .. 'a') == 10)
assert(tonumber('0x0.' .. string.rep('0', 13).."1") == 2.0^(-4*14))
assert(tonumber('0x0.' .. string.rep('0', 150).."1") == 2.0^(-4*151))
assert(tonumber('0x0.' .. string.rep('0', 300).."1") == 2.0^(-4*301))
assert(tonumber('0x0.' .. string.rep('0', 500).."1") == 2.0^(-4*501))
assert(tonumber('0xe03' .. string.rep('0', 1000) .. 'p-4000') == 3587.0)
assert(tonumber('0x.' .. string.rep('0', 1000) .. '74p4004') == 0x7.4)
end
-- testing 'tonumber' for invalid formats
local function f (...)
if select('#', ...) == 1 then
return (...)
else
return "***"
end
end
assert(not f(tonumber('fFfa', 15)))
assert(not f(tonumber('099', 8)))
assert(not f(tonumber('1\0', 2)))
assert(not f(tonumber('', 8)))
assert(not f(tonumber(' ', 9)))
assert(not f(tonumber(' ', 9)))
assert(not f(tonumber('0xf', 10)))
assert(not f(tonumber('inf')))
assert(not f(tonumber(' INF ')))
assert(not f(tonumber('Nan')))
assert(not f(tonumber('nan')))
assert(not f(tonumber(' ')))
assert(not f(tonumber('')))
assert(not f(tonumber('1 a')))
assert(not f(tonumber('1 a', 2)))
assert(not f(tonumber('1\0')))
assert(not f(tonumber('1 \0')))
assert(not f(tonumber('1\0 ')))
assert(not f(tonumber('e1')))
assert(not f(tonumber('e 1')))
assert(not f(tonumber(' 3.4.5 ')))
-- testing 'tonumber' for invalid hexadecimal formats
assert(not tonumber('0x'))
assert(not tonumber('x'))
assert(not tonumber('x3'))
assert(not tonumber('0x3.3.3')) -- two decimal points
assert(not tonumber('00x2'))
assert(not tonumber('0x 2'))
assert(not tonumber('0 x2'))
assert(not tonumber('23x'))
assert(not tonumber('- 0xaa'))
assert(not tonumber('-0xaaP ')) -- no exponent
assert(not tonumber('0x0.51p'))
assert(not tonumber('0x5p+-2'))
-- testing hexadecimal numerals
assert(0x10 == 16 and 0xfff == 2^12 - 1 and 0XFB == 251)
assert(0x0p12 == 0 and 0x.0p-3 == 0)
assert(0xFFFFFFFF == (1 << 32) - 1)
assert(tonumber('+0x2') == 2)
assert(tonumber('-0xaA') == -170)
assert(tonumber('-0xffFFFfff') == -(1 << 32) + 1)
-- possible confusion with decimal exponent
assert(0E+1 == 0 and 0xE+1 == 15 and 0xe-1 == 13)
-- floating hexas
assert(tonumber(' 0x2.5 ') == 0x25/16)
assert(tonumber(' -0x2.5 ') == -0x25/16)
assert(tonumber(' +0x0.51p+8 ') == 0x51)
assert(0x.FfffFFFF == 1 - '0x.00000001')
assert('0xA.a' + 0 == 10 + 10/16)
assert(0xa.aP4 == 0XAA)
assert(0x4P-2 == 1)
assert(0x1.1 == '0x1.' + '+0x.1')
assert(0Xabcdef.0 == 0x.ABCDEFp+24)
assert(1.1 == 1.+.1)
assert(100.0 == 1E2 and .01 == 1e-2)
assert(1111111111 - 1111111110 == 1000.00e-03)
assert(1.1 == '1.'+'.1')
assert(tonumber'1111111111' - tonumber'1111111110' ==
tonumber" +0.001e+3 \n\t")
assert(0.1e-30 > 0.9E-31 and 0.9E30 < 0.1e31)
assert(0.123456 > 0.123455)
assert(tonumber('+1.23E18') == 1.23*10.0^18)
-- testing order operators
assert(not(1<1) and (1<2) and not(2<1))
assert(not('a'<'a') and ('a'<'b') and not('b'<'a'))
assert((1<=1) and (1<=2) and not(2<=1))
assert(('a'<='a') and ('a'<='b') and not('b'<='a'))
assert(not(1>1) and not(1>2) and (2>1))
assert(not('a'>'a') and not('a'>'b') and ('b'>'a'))
assert((1>=1) and not(1>=2) and (2>=1))
assert(('a'>='a') and not('a'>='b') and ('b'>='a'))
assert(1.3 < 1.4 and 1.3 <= 1.4 and not (1.3 < 1.3) and 1.3 <= 1.3)
-- testing mod operator
assert(eqT(-4 % 3, 2))
assert(eqT(4 % -3, -2))
assert(eqT(-4.0 % 3, 2.0))
assert(eqT(4 % -3.0, -2.0))
assert(eqT(4 % -5, -1))
assert(eqT(4 % -5.0, -1.0))
assert(eqT(4 % 5, 4))
assert(eqT(4 % 5.0, 4.0))
assert(eqT(-4 % -5, -4))
assert(eqT(-4 % -5.0, -4.0))
assert(eqT(-4 % 5, 1))
assert(eqT(-4 % 5.0, 1.0))
assert(eqT(4.25 % 4, 0.25))
assert(eqT(10.0 % 2, 0.0))
assert(eqT(-10.0 % 2, 0.0))
assert(eqT(-10.0 % -2, 0.0))
assert(math.pi - math.pi % 1 == 3)
assert(math.pi - math.pi % 0.001 == 3.141)
do -- very small numbers
local i, j = 0, 20000
while i < j do
local m = (i + j) // 2
if 10^-m > 0 then
i = m + 1
else
j = m
end
end
-- 'i' is the smallest possible ten-exponent
local b = 10^-(i - (i // 10)) -- a very small number
assert(b > 0 and b * b == 0)
local delta = b / 1000
assert(eq((2.1 * b) % (2 * b), (0.1 * b), delta))
assert(eq((-2.1 * b) % (2 * b), (2 * b) - (0.1 * b), delta))
assert(eq((2.1 * b) % (-2 * b), (0.1 * b) - (2 * b), delta))
assert(eq((-2.1 * b) % (-2 * b), (-0.1 * b), delta))
end
-- basic consistency between integer modulo and float modulo
for i = -10, 10 do
for j = -10, 10 do
if j ~= 0 then
assert((i + 0.0) % j == i % j)
end
end
end
for i = 0, 10 do
for j = -10, 10 do
if j ~= 0 then
assert((2^i) % j == (1 << i) % j)
end
end
end
do -- precision of module for large numbers
local i = 10
while (1 << i) > 0 do
assert((1 << i) % 3 == i % 2 + 1)
i = i + 1
end
i = 10
while 2^i < math.huge do
assert(2^i % 3 == i % 2 + 1)
i = i + 1
end
end
assert(eqT(minint % minint, 0))
assert(eqT(maxint % maxint, 0))
assert((minint + 1) % minint == minint + 1)
assert((maxint - 1) % maxint == maxint - 1)
assert(minint % maxint == maxint - 1)
assert(minint % -1 == 0)
assert(minint % -2 == 0)
assert(maxint % -2 == -1)
-- non-portable tests because Windows C library cannot compute
-- fmod(1, huge) correctly
if not _port then
local function anan (x) assert(isNaN(x)) end -- assert Not a Number
anan(0.0 % 0)
anan(1.3 % 0)
anan(math.huge % 1)
anan(math.huge % 1e30)
anan(-math.huge % 1e30)
anan(-math.huge % -1e30)
assert(1 % math.huge == 1)
assert(1e30 % math.huge == 1e30)
assert(1e30 % -math.huge == -math.huge)
assert(-1 % math.huge == math.huge)
assert(-1 % -math.huge == -1)
end
-- testing unsigned comparisons
assert(math.ult(3, 4))
assert(not math.ult(4, 4))
assert(math.ult(-2, -1))
assert(math.ult(2, -1))
assert(not math.ult(-2, -2))
assert(math.ult(maxint, minint))
assert(not math.ult(minint, maxint))
assert(eq(math.sin(-9.8)^2 + math.cos(-9.8)^2, 1))
assert(eq(math.tan(math.pi/4), 1))
assert(eq(math.sin(math.pi/2), 1) and eq(math.cos(math.pi/2), 0))
assert(eq(math.atan(1), math.pi/4) and eq(math.acos(0), math.pi/2) and
eq(math.asin(1), math.pi/2))
assert(eq(math.deg(math.pi/2), 90) and eq(math.rad(90), math.pi/2))
assert(math.abs(-10.43) == 10.43)
assert(eqT(math.abs(minint), minint))
assert(eqT(math.abs(maxint), maxint))
assert(eqT(math.abs(-maxint), maxint))
assert(eq(math.atan(1,0), math.pi/2))
assert(math.fmod(10,3) == 1)
assert(eq(math.sqrt(10)^2, 10))
assert(eq(math.log(2, 10), math.log(2)/math.log(10)))
assert(eq(math.log(2, 2), 1))
assert(eq(math.log(9, 3), 2))
assert(eq(math.exp(0), 1))
assert(eq(math.sin(10), math.sin(10%(2*math.pi))))
assert(tonumber(' 1.3e-2 ') == 1.3e-2)
assert(tonumber(' -1.00000000000001 ') == -1.00000000000001)
-- testing constant limits
-- 2^23 = 8388608
assert(8388609 + -8388609 == 0)
assert(8388608 + -8388608 == 0)
assert(8388607 + -8388607 == 0)
do -- testing floor & ceil
assert(eqT(math.floor(3.4), 3))
assert(eqT(math.ceil(3.4), 4))
assert(eqT(math.floor(-3.4), -4))
assert(eqT(math.ceil(-3.4), -3))
assert(eqT(math.floor(maxint), maxint))
assert(eqT(math.ceil(maxint), maxint))
assert(eqT(math.floor(minint), minint))
assert(eqT(math.floor(minint + 0.0), minint))
assert(eqT(math.ceil(minint), minint))
assert(eqT(math.ceil(minint + 0.0), minint))
assert(math.floor(1e50) == 1e50)
assert(math.ceil(1e50) == 1e50)
assert(math.floor(-1e50) == -1e50)
assert(math.ceil(-1e50) == -1e50)
for _, p in pairs{31,32,63,64} do
assert(math.floor(2^p) == 2^p)
assert(math.floor(2^p + 0.5) == 2^p)
assert(math.ceil(2^p) == 2^p)
assert(math.ceil(2^p - 0.5) == 2^p)
end
checkerror("number expected", math.floor, {})
checkerror("number expected", math.ceil, print)
assert(eqT(math.tointeger(minint), minint))
assert(eqT(math.tointeger(minint .. ""), minint))
assert(eqT(math.tointeger(maxint), maxint))
assert(eqT(math.tointeger(maxint .. ""), maxint))
assert(eqT(math.tointeger(minint + 0.0), minint))
assert(not math.tointeger(0.0 - minint))
assert(not math.tointeger(math.pi))
assert(not math.tointeger(-math.pi))
assert(math.floor(math.huge) == math.huge)
assert(math.ceil(math.huge) == math.huge)
assert(not math.tointeger(math.huge))
assert(math.floor(-math.huge) == -math.huge)
assert(math.ceil(-math.huge) == -math.huge)
assert(not math.tointeger(-math.huge))
assert(math.tointeger("34.0") == 34)
assert(not math.tointeger("34.3"))
assert(not math.tointeger({}))
assert(not math.tointeger(0/0)) -- NaN
end
-- testing fmod for integers
for i = -6, 6 do
for j = -6, 6 do
if j ~= 0 then
local mi = math.fmod(i, j)
local mf = math.fmod(i + 0.0, j)
assert(mi == mf)
assert(math.type(mi) == 'integer' and math.type(mf) == 'float')
if (i >= 0 and j >= 0) or (i <= 0 and j <= 0) or mi == 0 then
assert(eqT(mi, i % j))
end
end
end
end
assert(eqT(math.fmod(minint, minint), 0))
assert(eqT(math.fmod(maxint, maxint), 0))
assert(eqT(math.fmod(minint + 1, minint), minint + 1))
assert(eqT(math.fmod(maxint - 1, maxint), maxint - 1))
checkerror("zero", math.fmod, 3, 0)
do -- testing max/min
checkerror("value expected", math.max)
checkerror("value expected", math.min)
assert(eqT(math.max(3), 3))
assert(eqT(math.max(3, 5, 9, 1), 9))
assert(math.max(maxint, 10e60) == 10e60)
assert(eqT(math.max(minint, minint + 1), minint + 1))
assert(eqT(math.min(3), 3))
assert(eqT(math.min(3, 5, 9, 1), 1))
assert(math.min(3.2, 5.9, -9.2, 1.1) == -9.2)
assert(math.min(1.9, 1.7, 1.72) == 1.7)
assert(math.min(-10e60, minint) == -10e60)
assert(eqT(math.min(maxint, maxint - 1), maxint - 1))
assert(eqT(math.min(maxint - 2, maxint, maxint - 1), maxint - 2))
end
-- testing implicit conversions
local a,b = '10', '20'
assert(a*b == 200 and a+b == 30 and a-b == -10 and a/b == 0.5 and -b == -20)
assert(a == '10' and b == '20')
do
print("testing -0 and NaN")
local mz <const> = -0.0
local z <const> = 0.0
assert(mz == z)
assert(1/mz < 0 and 0 < 1/z)
local a = {[mz] = 1}
assert(a[z] == 1 and a[mz] == 1)
a[z] = 2
assert(a[z] == 2 and a[mz] == 2)
local inf = math.huge * 2 + 1
local mz <const> = -1/inf
local z <const> = 1/inf
assert(mz == z)
assert(1/mz < 0 and 0 < 1/z)
local NaN <const> = inf - inf
assert(NaN ~= NaN)
assert(not (NaN < NaN))
assert(not (NaN <= NaN))
assert(not (NaN > NaN))
assert(not (NaN >= NaN))
assert(not (0 < NaN) and not (NaN < 0))
local NaN1 <const> = 0/0
assert(NaN ~= NaN1 and not (NaN <= NaN1) and not (NaN1 <= NaN))
local a = {}
assert(not pcall(rawset, a, NaN, 1))
assert(a[NaN] == undef)
a[1] = 1
assert(not pcall(rawset, a, NaN, 1))
assert(a[NaN] == undef)
-- strings with same binary representation as 0.0 (might create problems
-- for constant manipulation in the pre-compiler)
local a1, a2, a3, a4, a5 = 0, 0, "\0\0\0\0\0\0\0\0", 0, "\0\0\0\0\0\0\0\0"
assert(a1 == a2 and a2 == a4 and a1 ~= a3)
assert(a3 == a5)
end
print("testing 'math.random'")
local random, max, min = math.random, math.max, math.min
local function testnear (val, ref, tol)
return (math.abs(val - ref) < ref * tol)
end
-- low-level!! For the current implementation of random in Lua,
-- the first call after seed 1007 should return 0x7a7040a5a323c9d6
do
-- all computations should work with 32-bit integers
local h <const> = 0x7a7040a5 -- higher half
local l <const> = 0xa323c9d6 -- lower half
math.randomseed(1007)
-- get the low 'intbits' of the 64-bit expected result
local res = (h << 32 | l) & ~(~0 << intbits)
assert(random(0) == res)
math.randomseed(1007, 0)
-- using higher bits to generate random floats; (the '% 2^32' converts
-- 32-bit integers to floats as unsigned)
local res
if floatbits <= 32 then
-- get all bits from the higher half
res = (h >> (32 - floatbits)) % 2^32
else
-- get 32 bits from the higher half and the rest from the lower half
res = (h % 2^32) * 2^(floatbits - 32) + ((l >> (64 - floatbits)) % 2^32)
end
local rand = random()
assert(eq(rand, 0x0.7a7040a5a323c9d6, 2^-floatbits))
assert(rand * 2^floatbits == res)
end
do
-- testing return of 'randomseed'
local x, y = math.randomseed()
local res = math.random(0)
x, y = math.randomseed(x, y) -- should repeat the state
assert(math.random(0) == res)
math.randomseed(x, y) -- again should repeat the state
assert(math.random(0) == res)
-- keep the random seed for following tests
end
do -- test random for floats
local randbits = math.min(floatbits, 64) -- at most 64 random bits
local mult = 2^randbits -- to make random float into an integral
local counts = {} -- counts for bits
for i = 1, randbits do counts[i] = 0 end
local up = -math.huge
local low = math.huge
local rounds = 100 * randbits -- 100 times for each bit
local totalrounds = 0
::doagain:: -- will repeat test until we get good statistics
for i = 0, rounds do
local t = random()
assert(0 <= t and t < 1)
up = max(up, t)
low = min(low, t)
assert(t * mult % 1 == 0) -- no extra bits
local bit = i % randbits -- bit to be tested
if (t * 2^bit) % 1 >= 0.5 then -- is bit set?
counts[bit + 1] = counts[bit + 1] + 1 -- increment its count
end
end
totalrounds = totalrounds + rounds
if not (eq(up, 1, 0.001) and eq(low, 0, 0.001)) then
goto doagain
end
-- all bit counts should be near 50%
local expected = (totalrounds / randbits / 2)
for i = 1, randbits do
if not testnear(counts[i], expected, 0.10) then
goto doagain
end
end
print(string.format("float random range in %d calls: [%f, %f]",
totalrounds, low, up))
end
do -- test random for full integers
local up = 0
local low = 0
local counts = {} -- counts for bits
for i = 1, intbits do counts[i] = 0 end
local rounds = 100 * intbits -- 100 times for each bit
local totalrounds = 0
::doagain:: -- will repeat test until we get good statistics
for i = 0, rounds do
local t = random(0)
up = max(up, t)
low = min(low, t)
local bit = i % intbits -- bit to be tested
-- increment its count if it is set
counts[bit + 1] = counts[bit + 1] + ((t >> bit) & 1)
end
totalrounds = totalrounds + rounds
local lim = maxint >> 10
if not (maxint - up < lim and low - minint < lim) then
goto doagain
end
-- all bit counts should be near 50%
local expected = (totalrounds / intbits / 2)
for i = 1, intbits do
if not testnear(counts[i], expected, 0.10) then
goto doagain
end
end
print(string.format(
"integer random range in %d calls: [minint + %.0fppm, maxint - %.0fppm]",
totalrounds, (minint - low) / minint * 1e6,
(maxint - up) / maxint * 1e6))
end
do
-- test distribution for a dice
local count = {0, 0, 0, 0, 0, 0}
local rep = 200
local totalrep = 0
::doagain::
for i = 1, rep * 6 do
local r = random(6)
count[r] = count[r] + 1
end
totalrep = totalrep + rep
for i = 1, 6 do
if not testnear(count[i], totalrep, 0.05) then
goto doagain
end
end
end
do
local function aux (x1, x2) -- test random for small intervals
local mark = {}; local count = 0 -- to check that all values appeared
while true do
local t = random(x1, x2)
assert(x1 <= t and t <= x2)
if not mark[t] then -- new value
mark[t] = true
count = count + 1
if count == x2 - x1 + 1 then -- all values appeared; OK
goto ok
end
end
end
::ok::
end
aux(-10,0)
aux(1, 6)
aux(1, 2)
aux(1, 13)
aux(1, 31)
aux(1, 32)
aux(1, 33)
aux(-10, 10)
aux(-10,-10) -- unit set
aux(minint, minint) -- unit set
aux(maxint, maxint) -- unit set
aux(minint, minint + 9)
aux(maxint - 3, maxint)
end
do
local function aux(p1, p2) -- test random for large intervals
local max = minint
local min = maxint
local n = 100
local mark = {}; local count = 0 -- to count how many different values
::doagain::
for _ = 1, n do
local t = random(p1, p2)
if not mark[t] then -- new value
assert(p1 <= t and t <= p2)
max = math.max(max, t)
min = math.min(min, t)
mark[t] = true
count = count + 1
end
end
-- at least 80% of values are different
if not (count >= n * 0.8) then
goto doagain
end
-- min and max not too far from formal min and max
local diff = (p2 - p1) >> 4
if not (min < p1 + diff and max > p2 - diff) then
goto doagain
end
end
aux(0, maxint)
aux(1, maxint)
aux(3, maxint // 3)
aux(minint, -1)
aux(minint // 2, maxint // 2)
aux(minint, maxint)
aux(minint + 1, maxint)
aux(minint, maxint - 1)
aux(0, 1 << (intbits - 5))
end
assert(not pcall(random, 1, 2, 3)) -- too many arguments
-- empty interval
assert(not pcall(random, minint + 1, minint))
assert(not pcall(random, maxint, maxint - 1))
assert(not pcall(random, maxint, minint))
print('OK')
NEXTVAR¶
-- $Id: testes/nextvar.lua $
-- See Copyright Notice in file all.lua
print('testing tables, next, and for')
local function checkerror (msg, f, ...)
local s, err = pcall(f, ...)
assert(not s and string.find(err, msg))
end
local a = {}
-- make sure table has lots of space in hash part
for i=1,100 do a[i.."+"] = true end
for i=1,100 do a[i.."+"] = undef end
-- fill hash part with numeric indices testing size operator
for i=1,100 do
a[i] = true
assert(#a == i)
end
-- testing ipairs
local x = 0
for k,v in ipairs{10,20,30;x=12} do
x = x + 1
assert(k == x and v == x * 10)
end
for _ in ipairs{x=12, y=24} do assert(nil) end
-- test for 'false' x ipair
x = false
local i = 0
for k,v in ipairs{true,false,true,false} do
i = i + 1
x = not x
assert(x == v)
end
assert(i == 4)
-- iterator function is always the same
assert(type(ipairs{}) == 'function' and ipairs{} == ipairs{})
if not T then
(Message or print)
('\n >>> testC not active: skipping tests for table sizes <<<\n')
else --[
-- testing table sizes
local function mp2 (n) -- minimum power of 2 >= n
local mp = 2^math.ceil(math.log(n, 2))
assert(n == 0 or (mp/2 < n and n <= mp))
return mp
end
local function check (t, na, nh)
local a, h = T.querytab(t)
if a ~= na or h ~= nh then
print(na, nh, a, h)
assert(nil)
end
end
-- testing C library sizes
do
local s = 0
for _ in pairs(math) do s = s + 1 end
check(math, 0, mp2(s))
end
-- testing constructor sizes
local sizes = {0, 1, 2, 3, 4, 5, 7, 8, 9, 15, 16, 17,
30, 31, 32, 33, 34, 254, 255, 256, 500, 1000}
for _, sa in ipairs(sizes) do -- 'sa' is size of the array part
local arr = {"return {"}
for i = 1, sa do arr[1 + i] = "1," end -- build array part
for _, sh in ipairs(sizes) do -- 'sh' is size of the hash part
for j = 1, sh do -- build hash part
arr[1 + sa + j] = string.format('k%x=%d,', j, j)
end
arr[1 + sa + sh + 1] = "}"
local prog = table.concat(arr)
local f = assert(load(prog))
f() -- call once to ensure stack space
-- make sure table is not resized after being created
if sa == 0 or sh == 0 then
T.alloccount(2); -- header + array or hash part
else
T.alloccount(3); -- header + array part + hash part
end
local t = f()
T.alloccount();
assert(#t == sa)
check(t, sa, mp2(sh))
end
end
-- tests with unknown number of elements
local a = {}
for i=1,sizes[#sizes] do a[i] = i end -- build auxiliary table
for k in ipairs(sizes) do
local t = {table.unpack(a,1,k)}
assert(#t == k)
check(t, k, 0)
t = {1,2,3,table.unpack(a,1,k)}
check(t, k+3, 0)
assert(#t == k + 3)
end
-- testing tables dynamically built
local lim = 130
local a = {}; a[2] = 1; check(a, 0, 1)
a = {}; a[0] = 1; check(a, 0, 1); a[2] = 1; check(a, 0, 2)
a = {}; a[0] = 1; a[1] = 1; check(a, 1, 1)
a = {}
for i = 1,lim do
a[i] = 1
assert(#a == i)
check(a, mp2(i), 0)
end
a = {}
for i = 1,lim do
a['a'..i] = 1
assert(#a == 0)
check(a, 0, mp2(i))
end
a = {}
for i=1,16 do a[i] = i end
check(a, 16, 0)
do
for i=1,11 do a[i] = undef end
for i=30,50 do a[i] = true; a[i] = undef end -- force a rehash (?)
check(a, 0, 8) -- 5 elements in the table
a[10] = 1
for i=30,50 do a[i] = true; a[i] = undef end -- force a rehash (?)
check(a, 0, 8) -- only 6 elements in the table
for i=1,14 do a[i] = true; a[i] = undef end
for i=18,50 do a[i] = true; a[i] = undef end -- force a rehash (?)
check(a, 0, 4) -- only 2 elements ([15] and [16])
end
-- reverse filling
for i=1,lim do
local a = {}
for i=i,1,-1 do a[i] = i end -- fill in reverse
check(a, mp2(i), 0)
end
-- size tests for vararg
lim = 35
function foo (n, ...)
local arg = {...}
check(arg, n, 0)
assert(select('#', ...) == n)
arg[n+1] = true
check(arg, mp2(n+1), 0)
arg.x = true
check(arg, mp2(n+1), 1)
end
local a = {}
for i=1,lim do a[i] = true; foo(i, table.unpack(a)) end
-- Table length with limit smaller than maximum value at array
local a = {}
for i = 1,64 do a[i] = true end -- make its array size 64
for i = 1,64 do a[i] = nil end -- erase all elements
assert(T.querytab(a) == 64) -- array part has 64 elements
a[32] = true; a[48] = true; -- binary search will find these ones
a[51] = true -- binary search will miss this one
assert(#a == 48) -- this will set the limit
assert(select(4, T.querytab(a)) == 48) -- this is the limit now
a[50] = true -- this will set a new limit
assert(select(4, T.querytab(a)) == 50) -- this is the limit now
-- but the size is larger (and still inside the array part)
assert(#a == 51)
end --]
-- test size operation on tables with nils
assert(#{} == 0)
assert(#{nil} == 0)
assert(#{nil, nil} == 0)
assert(#{nil, nil, nil} == 0)
assert(#{nil, nil, nil, nil} == 0)
assert(#{1, 2, 3, nil, nil} == 3)
print'+'
local nofind = {}
a,b,c = 1,2,3
a,b,c = nil
-- next uses always the same iteraction function
assert(next{} == next{})
local function find (name)
local n,v
while 1 do
n,v = next(_G, n)
if not n then return nofind end
assert(_G[n] ~= undef)
if n == name then return v end
end
end
local function find1 (name)
for n,v in pairs(_G) do
if n==name then return v end
end
return nil -- not found
end
assert(print==find("print") and print == find1("print"))
assert(_G["print"]==find("print"))
assert(assert==find1("assert"))
assert(nofind==find("return"))
assert(not find1("return"))
_G["ret" .. "urn"] = undef
assert(nofind==find("return"))
_G["xxx"] = 1
assert(xxx==find("xxx"))
-- invalid key to 'next'
checkerror("invalid key", next, {10,20}, 3)
-- both 'pairs' and 'ipairs' need an argument
checkerror("bad argument", pairs)
checkerror("bad argument", ipairs)
print('+')
a = {}
for i=0,10000 do
if math.fmod(i,10) ~= 0 then
a['x'..i] = i
end
end
n = {n=0}
for i,v in pairs(a) do
n.n = n.n+1
assert(i and v and a[i] == v)
end
assert(n.n == 9000)
a = nil
do -- clear global table
local a = {}
for n,v in pairs(_G) do a[n]=v end
for n,v in pairs(a) do
if not package.loaded[n] and type(v) ~= "function" and
not string.find(n, "^[%u_]") then
_G[n] = undef
end
collectgarbage()
end
end
--
local function checknext (a)
local b = {}
do local k,v = next(a); while k do b[k] = v; k,v = next(a,k) end end
for k,v in pairs(b) do assert(a[k] == v) end
for k,v in pairs(a) do assert(b[k] == v) end
end
checknext{1,x=1,y=2,z=3}
checknext{1,2,x=1,y=2,z=3}
checknext{1,2,3,x=1,y=2,z=3}
checknext{1,2,3,4,x=1,y=2,z=3}
checknext{1,2,3,4,5,x=1,y=2,z=3}
assert(#{} == 0)
assert(#{[-1] = 2} == 0)
for i=0,40 do
local a = {}
for j=1,i do a[j]=j end
assert(#a == i)
end
-- 'maxn' is now deprecated, but it is easily defined in Lua
function table.maxn (t)
local max = 0
for k in pairs(t) do
max = (type(k) == 'number') and math.max(max, k) or max
end
return max
end
assert(table.maxn{} == 0)
assert(table.maxn{["1000"] = true} == 0)
assert(table.maxn{["1000"] = true, [24.5] = 3} == 24.5)
assert(table.maxn{[1000] = true} == 1000)
assert(table.maxn{[10] = true, [100*math.pi] = print} == 100*math.pi)
table.maxn = nil
-- int overflow
a = {}
for i=0,50 do a[2^i] = true end
assert(a[#a])
print('+')
do -- testing 'next' with all kinds of keys
local a = {
[1] = 1, -- integer
[1.1] = 2, -- float
['x'] = 3, -- short string
[string.rep('x', 1000)] = 4, -- long string
[print] = 5, -- C function
[checkerror] = 6, -- Lua function
[coroutine.running()] = 7, -- thread
[true] = 8, -- boolean
[io.stdin] = 9, -- userdata
[{}] = 10, -- table
}
local b = {}; for i = 1, 10 do b[i] = true end
for k, v in pairs(a) do
assert(b[v]); b[v] = undef
end
assert(next(b) == nil) -- 'b' now is empty
end
-- erasing values
local t = {[{1}] = 1, [{2}] = 2, [string.rep("x ", 4)] = 3,
[100.3] = 4, [4] = 5}
local n = 0
for k, v in pairs( t ) do
n = n+1
assert(t[k] == v)
t[k] = undef
collectgarbage()
assert(t[k] == undef)
end
assert(n == 5)
local function test (a)
assert(not pcall(table.insert, a, 2, 20));
table.insert(a, 10); table.insert(a, 2, 20);
table.insert(a, 1, -1); table.insert(a, 40);
table.insert(a, #a+1, 50)
table.insert(a, 2, -2)
assert(a[2] ~= undef)
assert(a["2"] == undef)
assert(not pcall(table.insert, a, 0, 20));
assert(not pcall(table.insert, a, #a + 2, 20));
assert(table.remove(a,1) == -1)
assert(table.remove(a,1) == -2)
assert(table.remove(a,1) == 10)
assert(table.remove(a,1) == 20)
assert(table.remove(a,1) == 40)
assert(table.remove(a,1) == 50)
assert(table.remove(a,1) == nil)
assert(table.remove(a) == nil)
assert(table.remove(a, #a) == nil)
end
a = {n=0, [-7] = "ban"}
test(a)
assert(a.n == 0 and a[-7] == "ban")
a = {[-7] = "ban"};
test(a)
assert(a.n == nil and #a == 0 and a[-7] == "ban")
a = {[-1] = "ban"}
test(a)
assert(#a == 0 and table.remove(a) == nil and a[-1] == "ban")
a = {[0] = "ban"}
assert(#a == 0 and table.remove(a) == "ban" and a[0] == undef)
table.insert(a, 1, 10); table.insert(a, 1, 20); table.insert(a, 1, -1)
assert(table.remove(a) == 10)
assert(table.remove(a) == 20)
assert(table.remove(a) == -1)
assert(table.remove(a) == nil)
a = {'c', 'd'}
table.insert(a, 3, 'a')
table.insert(a, 'b')
assert(table.remove(a, 1) == 'c')
assert(table.remove(a, 1) == 'd')
assert(table.remove(a, 1) == 'a')
assert(table.remove(a, 1) == 'b')
assert(table.remove(a, 1) == nil)
assert(#a == 0 and a.n == nil)
a = {10,20,30,40}
assert(table.remove(a, #a + 1) == nil)
assert(not pcall(table.remove, a, 0))
assert(a[#a] == 40)
assert(table.remove(a, #a) == 40)
assert(a[#a] == 30)
assert(table.remove(a, 2) == 20)
assert(a[#a] == 30 and #a == 2)
do -- testing table library with metamethods
local function test (proxy, t)
for i = 1, 10 do
table.insert(proxy, 1, i)
end
assert(#proxy == 10 and #t == 10 and proxy[1] ~= undef)
for i = 1, 10 do
assert(t[i] == 11 - i)
end
table.sort(proxy)
for i = 1, 10 do
assert(t[i] == i and proxy[i] == i)
end
assert(table.concat(proxy, ",") == "1,2,3,4,5,6,7,8,9,10")
for i = 1, 8 do
assert(table.remove(proxy, 1) == i)
end
assert(#proxy == 2 and #t == 2)
local a, b, c = table.unpack(proxy)
assert(a == 9 and b == 10 and c == nil)
end
-- all virtual
local t = {}
local proxy = setmetatable({}, {
__len = function () return #t end,
__index = t,
__newindex = t,
})
test(proxy, t)
-- only __newindex
local count = 0
t = setmetatable({}, {
__newindex = function (t,k,v) count = count + 1; rawset(t,k,v) end})
test(t, t)
assert(count == 10) -- after first 10, all other sets are not new
-- no __newindex
t = setmetatable({}, {
__index = function (_,k) return k + 1 end,
__len = function (_) return 5 end})
assert(table.concat(t, ";") == "2;3;4;5;6")
end
if not T then
(Message or print)
('\n >>> testC not active: skipping tests for table library on non-tables <<<\n')
else --[
local debug = require'debug'
local tab = {10, 20, 30}
local mt = {}
local u = T.newuserdata(0)
checkerror("table expected", table.insert, u, 40)
checkerror("table expected", table.remove, u)
debug.setmetatable(u, mt)
checkerror("table expected", table.insert, u, 40)
checkerror("table expected", table.remove, u)
mt.__index = tab
checkerror("table expected", table.insert, u, 40)
checkerror("table expected", table.remove, u)
mt.__newindex = tab
checkerror("table expected", table.insert, u, 40)
checkerror("table expected", table.remove, u)
mt.__len = function () return #tab end
table.insert(u, 40)
assert(#u == 4 and #tab == 4 and u[4] == 40 and tab[4] == 40)
assert(table.remove(u) == 40)
table.insert(u, 1, 50)
assert(#u == 4 and #tab == 4 and u[4] == 30 and tab[1] == 50)
mt.__newindex = nil
mt.__len = nil
local tab2 = {}
local u2 = T.newuserdata(0)
debug.setmetatable(u2, {__newindex = function (_, k, v) tab2[k] = v end})
table.move(u, 1, 4, 1, u2)
assert(#tab2 == 4 and tab2[1] == tab[1] and tab2[4] == tab[4])
end -- ]
print('+')
a = {}
for i=1,1000 do
a[i] = i; a[i - 1] = undef
end
assert(next(a,nil) == 1000 and next(a,1000) == nil)
assert(next({}) == nil)
assert(next({}, nil) == nil)
for a,b in pairs{} do error"not here" end
for i=1,0 do error'not here' end
for i=0,1,-1 do error'not here' end
a = nil; for i=1,1 do assert(not a); a=1 end; assert(a)
a = nil; for i=1,1,-1 do assert(not a); a=1 end; assert(a)
do
print("testing floats in numeric for")
local a
-- integer count
a = 0; for i=1, 1, 1 do a=a+1 end; assert(a==1)
a = 0; for i=10000, 1e4, -1 do a=a+1 end; assert(a==1)
a = 0; for i=1, 0.99999, 1 do a=a+1 end; assert(a==0)
a = 0; for i=9999, 1e4, -1 do a=a+1 end; assert(a==0)
a = 0; for i=1, 0.99999, -1 do a=a+1 end; assert(a==1)
-- float count
a = 0; for i=0, 0.999999999, 0.1 do a=a+1 end; assert(a==10)
a = 0; for i=1.0, 1, 1 do a=a+1 end; assert(a==1)
a = 0; for i=-1.5, -1.5, 1 do a=a+1 end; assert(a==1)
a = 0; for i=1e6, 1e6, -1 do a=a+1 end; assert(a==1)
a = 0; for i=1.0, 0.99999, 1 do a=a+1 end; assert(a==0)
a = 0; for i=99999, 1e5, -1.0 do a=a+1 end; assert(a==0)
a = 0; for i=1.0, 0.99999, -1 do a=a+1 end; assert(a==1)
end
do -- changing the control variable
local a
a = 0; for i = 1, 10 do a = a + 1; i = "x" end; assert(a == 10)
a = 0; for i = 10.0, 1, -1 do a = a + 1; i = "x" end; assert(a == 10)
end
-- conversion
a = 0; for i="10","1","-2" do a=a+1 end; assert(a==5)
do -- checking types
local c
local function checkfloat (i)
assert(math.type(i) == "float")
c = c + 1
end
c = 0; for i = 1.0, 10 do checkfloat(i) end
assert(c == 10)
c = 0; for i = -1, -10, -1.0 do checkfloat(i) end
assert(c == 10)
local function checkint (i)
assert(math.type(i) == "integer")
c = c + 1
end
local m = math.maxinteger
c = 0; for i = m, m - 10, -1 do checkint(i) end
assert(c == 11)
c = 0; for i = 1, 10.9 do checkint(i) end
assert(c == 10)
c = 0; for i = 10, 0.001, -1 do checkint(i) end
assert(c == 10)
c = 0; for i = 1, "10.8" do checkint(i) end
assert(c == 10)
c = 0; for i = 9, "3.4", -1 do checkint(i) end
assert(c == 6)
c = 0; for i = 0, " -3.4 ", -1 do checkint(i) end
assert(c == 4)
c = 0; for i = 100, "96.3", -2 do checkint(i) end
assert(c == 2)
c = 0; for i = 1, math.huge do if i > 10 then break end; checkint(i) end
assert(c == 10)
c = 0; for i = -1, -math.huge, -1 do
if i < -10 then break end; checkint(i)
end
assert(c == 10)
for i = math.mininteger, -10e100 do assert(false) end
for i = math.maxinteger, 10e100, -1 do assert(false) end
end
do -- testing other strange cases for numeric 'for'
local function checkfor (from, to, step, t)
local c = 0
for i = from, to, step do
c = c + 1
assert(i == t[c])
end
assert(c == #t)
end
local maxi = math.maxinteger
local mini = math.mininteger
checkfor(mini, maxi, maxi, {mini, -1, maxi - 1})
checkfor(mini, math.huge, maxi, {mini, -1, maxi - 1})
checkfor(maxi, mini, mini, {maxi, -1})
checkfor(maxi, mini, -maxi, {maxi, 0, -maxi})
checkfor(maxi, -math.huge, mini, {maxi, -1})
checkfor(maxi, mini, 1, {})
checkfor(mini, maxi, -1, {})
checkfor(maxi - 6, maxi, 3, {maxi - 6, maxi - 3, maxi})
checkfor(mini + 4, mini, -2, {mini + 4, mini + 2, mini})
local step = maxi // 10
local c = mini
for i = mini, maxi, step do
assert(i == c)
c = c + step
end
c = maxi
for i = maxi, mini, -step do
assert(i == c)
c = c - step
end
checkfor(maxi, maxi, maxi, {maxi})
checkfor(maxi, maxi, mini, {maxi})
checkfor(mini, mini, maxi, {mini})
checkfor(mini, mini, mini, {mini})
end
checkerror("'for' step is zero", function ()
for i = 1, 10, 0 do end
end)
checkerror("'for' step is zero", function ()
for i = 1, -10, 0 do end
end)
checkerror("'for' step is zero", function ()
for i = 1.0, -10, 0.0 do end
end)
collectgarbage()
-- testing generic 'for'
local function f (n, p)
local t = {}; for i=1,p do t[i] = i*10 end
return function (_, n, ...)
assert(select("#", ...) == 0) -- no extra arguments
if n > 0 then
n = n-1
return n, table.unpack(t)
end
end, nil, n
end
local x = 0
for n,a,b,c,d in f(5,3) do
x = x+1
assert(a == 10 and b == 20 and c == 30 and d == nil)
end
assert(x == 5)
-- testing __pairs and __ipairs metamethod
a = {}
do
local x,y,z = pairs(a)
assert(type(x) == 'function' and y == a and z == nil)
end
local function foo (e,i)
assert(e == a)
if i <= 10 then return i+1, i+2 end
end
local function foo1 (e,i)
i = i + 1
assert(e == a)
if i <= e.n then return i,a[i] end
end
setmetatable(a, {__pairs = function (x) return foo, x, 0 end})
local i = 0
for k,v in pairs(a) do
i = i + 1
assert(k == i and v == k+1)
end
a.n = 5
a[3] = 30
-- testing ipairs with metamethods
a = {n=10}
setmetatable(a, { __index = function (t,k)
if k <= t.n then return k * 10 end
end})
i = 0
for k,v in ipairs(a) do
i = i + 1
assert(k == i and v == i * 10)
end
assert(i == a.n)
print"OK"
PM¶
-- $Id: testes/pm.lua $
-- See Copyright Notice in file all.lua
print('testing pattern matching')
local function checkerror (msg, f, ...)
local s, err = pcall(f, ...)
assert(not s and string.find(err, msg))
end
function f(s, p)
local i,e = string.find(s, p)
if i then return string.sub(s, i, e) end
end
a,b = string.find('', '') -- empty patterns are tricky
assert(a == 1 and b == 0);
a,b = string.find('alo', '')
assert(a == 1 and b == 0)
a,b = string.find('a\0o a\0o a\0o', 'a', 1) -- first position
assert(a == 1 and b == 1)
a,b = string.find('a\0o a\0o a\0o', 'a\0o', 2) -- starts in the midle
assert(a == 5 and b == 7)
a,b = string.find('a\0o a\0o a\0o', 'a\0o', 9) -- starts in the midle
assert(a == 9 and b == 11)
a,b = string.find('a\0a\0a\0a\0\0ab', '\0ab', 2); -- finds at the end
assert(a == 9 and b == 11);
a,b = string.find('a\0a\0a\0a\0\0ab', 'b') -- last position
assert(a == 11 and b == 11)
assert(not string.find('a\0a\0a\0a\0\0ab', 'b\0')) -- check ending
assert(not string.find('', '\0'))
assert(string.find('alo123alo', '12') == 4)
assert(not string.find('alo123alo', '^12'))
assert(string.match("aaab", ".*b") == "aaab")
assert(string.match("aaa", ".*a") == "aaa")
assert(string.match("b", ".*b") == "b")
assert(string.match("aaab", ".+b") == "aaab")
assert(string.match("aaa", ".+a") == "aaa")
assert(not string.match("b", ".+b"))
assert(string.match("aaab", ".?b") == "ab")
assert(string.match("aaa", ".?a") == "aa")
assert(string.match("b", ".?b") == "b")
assert(f('aloALO', '%l*') == 'alo')
assert(f('aLo_ALO', '%a*') == 'aLo')
assert(f(" \n\r*&\n\r xuxu \n\n", "%g%g%g+") == "xuxu")
assert(f('aaab', 'a*') == 'aaa');
assert(f('aaa', '^.*$') == 'aaa');
assert(f('aaa', 'b*') == '');
assert(f('aaa', 'ab*a') == 'aa')
assert(f('aba', 'ab*a') == 'aba')
assert(f('aaab', 'a+') == 'aaa')
assert(f('aaa', '^.+$') == 'aaa')
assert(not f('aaa', 'b+'))
assert(not f('aaa', 'ab+a'))
assert(f('aba', 'ab+a') == 'aba')
assert(f('a$a', '.$') == 'a')
assert(f('a$a', '.%$') == 'a$')
assert(f('a$a', '.$.') == 'a$a')
assert(not f('a$a', '$$'))
assert(not f('a$b', 'a$'))
assert(f('a$a', '$') == '')
assert(f('', 'b*') == '')
assert(not f('aaa', 'bb*'))
assert(f('aaab', 'a-') == '')
assert(f('aaa', '^.-$') == 'aaa')
assert(f('aabaaabaaabaaaba', 'b.*b') == 'baaabaaabaaab')
assert(f('aabaaabaaabaaaba', 'b.-b') == 'baaab')
assert(f('alo xo', '.o$') == 'xo')
assert(f(' \n isto é assim', '%S%S*') == 'isto')
assert(f(' \n isto é assim', '%S*$') == 'assim')
assert(f(' \n isto é assim', '[a-z]*$') == 'assim')
assert(f('um caracter ? extra', '[^%sa-z]') == '?')
assert(f('', 'a?') == '')
assert(f('á', 'á?') == 'á')
assert(f('ábl', 'á?b?l?') == 'ábl')
assert(f(' ábl', 'á?b?l?') == '')
assert(f('aa', '^aa?a?a') == 'aa')
assert(f(']]]áb', '[^]]') == 'á')
assert(f("0alo alo", "%x*") == "0a")
assert(f("alo alo", "%C+") == "alo alo")
print('+')
function f1(s, p)
p = string.gsub(p, "%%([0-9])", function (s)
return "%" .. (tonumber(s)+1)
end)
p = string.gsub(p, "^(^?)", "%1()", 1)
p = string.gsub(p, "($?)$", "()%1", 1)
local t = {string.match(s, p)}
return string.sub(s, t[1], t[#t] - 1)
end
assert(f1('alo alx 123 b\0o b\0o', '(..*) %1') == "b\0o b\0o")
assert(f1('axz123= 4= 4 34', '(.+)=(.*)=%2 %1') == '3= 4= 4 3')
assert(f1('=======', '^(=*)=%1$') == '=======')
assert(not string.match('==========', '^([=]*)=%1$'))
local function range (i, j)
if i <= j then
return i, range(i+1, j)
end
end
local abc = string.char(range(0, 127)) .. string.char(range(128, 255));
assert(string.len(abc) == 256)
function strset (p)
local res = {s=''}
string.gsub(abc, p, function (c) res.s = res.s .. c end)
return res.s
end;
assert(string.len(strset('[\200-\210]')) == 11)
assert(strset('[a-z]') == "abcdefghijklmnopqrstuvwxyz")
assert(strset('[a-z%d]') == strset('[%da-uu-z]'))
assert(strset('[a-]') == "-a")
assert(strset('[^%W]') == strset('[%w]'))
assert(strset('[]%%]') == '%]')
assert(strset('[a%-z]') == '-az')
assert(strset('[%^%[%-a%]%-b]') == '-[]^ab')
assert(strset('%Z') == strset('[\1-\255]'))
assert(strset('.') == strset('[\1-\255%z]'))
print('+');
assert(string.match("alo xyzK", "(%w+)K") == "xyz")
assert(string.match("254 K", "(%d*)K") == "")
assert(string.match("alo ", "(%w*)$") == "")
assert(not string.match("alo ", "(%w+)$"))
assert(string.find("(álo)", "%(á") == 1)
local a, b, c, d, e = string.match("âlo alo", "^(((.).).* (%w*))$")
assert(a == 'âlo alo' and b == 'âl' and c == 'â' and d == 'alo' and e == nil)
a, b, c, d = string.match('0123456789', '(.+(.?)())')
assert(a == '0123456789' and b == '' and c == 11 and d == nil)
print('+')
assert(string.gsub('ülo ülo', 'ü', 'x') == 'xlo xlo')
assert(string.gsub('alo úlo ', ' +$', '') == 'alo úlo') -- trim
assert(string.gsub(' alo alo ', '^%s*(.-)%s*$', '%1') == 'alo alo') -- double trim
assert(string.gsub('alo alo \n 123\n ', '%s+', ' ') == 'alo alo 123 ')
t = "abç d"
a, b = string.gsub(t, '(.)', '%1@')
assert('@'..a == string.gsub(t, '', '@') and b == 5)
a, b = string.gsub('abçd', '(.)', '%0@', 2)
assert(a == 'a@b@çd' and b == 2)
assert(string.gsub('alo alo', '()[al]', '%1') == '12o 56o')
assert(string.gsub("abc=xyz", "(%w*)(%p)(%w+)", "%3%2%1-%0") ==
"xyz=abc-abc=xyz")
assert(string.gsub("abc", "%w", "%1%0") == "aabbcc")
assert(string.gsub("abc", "%w+", "%0%1") == "abcabc")
assert(string.gsub('áéí', '$', '\0óú') == 'áéí\0óú')
assert(string.gsub('', '^', 'r') == 'r')
assert(string.gsub('', '$', 'r') == 'r')
print('+')
do -- new (5.3.3) semantics for empty matches
assert(string.gsub("a b cd", " *", "-") == "-a-b-c-d-")
local res = ""
local sub = "a \nbc\t\td"
local i = 1
for p, e in string.gmatch(sub, "()%s*()") do
res = res .. string.sub(sub, i, p - 1) .. "-"
i = e
end
assert(res == "-a-b-c-d-")
end
assert(string.gsub("um (dois) tres (quatro)", "(%(%w+%))", string.upper) ==
"um (DOIS) tres (QUATRO)")
do
local function setglobal (n,v) rawset(_G, n, v) end
string.gsub("a=roberto,roberto=a", "(%w+)=(%w%w*)", setglobal)
assert(_G.a=="roberto" and _G.roberto=="a")
end
function f(a,b) return string.gsub(a,'.',b) end
assert(string.gsub("trocar tudo em |teste|b| é |beleza|al|", "|([^|]*)|([^|]*)|", f) ==
"trocar tudo em bbbbb é alalalalalal")
local function dostring (s) return load(s, "")() or "" end
assert(string.gsub("alo $a='x'$ novamente $return a$",
"$([^$]*)%$",
dostring) == "alo novamente x")
x = string.gsub("$x=string.gsub('alo', '.', string.upper)$ assim vai para $return x$",
"$([^$]*)%$", dostring)
assert(x == ' assim vai para ALO')
t = {}
s = 'a alo jose joao'
r = string.gsub(s, '()(%w+)()', function (a,w,b)
assert(string.len(w) == b-a);
t[a] = b-a;
end)
assert(s == r and t[1] == 1 and t[3] == 3 and t[7] == 4 and t[13] == 4)
function isbalanced (s)
return not string.find(string.gsub(s, "%b()", ""), "[()]")
end
assert(isbalanced("(9 ((8))(\0) 7) \0\0 a b ()(c)() a"))
assert(not isbalanced("(9 ((8) 7) a b (\0 c) a"))
assert(string.gsub("alo 'oi' alo", "%b''", '"') == 'alo " alo')
local t = {"apple", "orange", "lime"; n=0}
assert(string.gsub("x and x and x", "x", function () t.n=t.n+1; return t[t.n] end)
== "apple and orange and lime")
t = {n=0}
string.gsub("first second word", "%w%w*", function (w) t.n=t.n+1; t[t.n] = w end)
assert(t[1] == "first" and t[2] == "second" and t[3] == "word" and t.n == 3)
t = {n=0}
assert(string.gsub("first second word", "%w+",
function (w) t.n=t.n+1; t[t.n] = w end, 2) == "first second word")
assert(t[1] == "first" and t[2] == "second" and t[3] == undef)
checkerror("invalid replacement value %(a table%)",
string.gsub, "alo", ".", {a = {}})
checkerror("invalid capture index %%2", string.gsub, "alo", ".", "%2")
checkerror("invalid capture index %%0", string.gsub, "alo", "(%0)", "a")
checkerror("invalid capture index %%1", string.gsub, "alo", "(%1)", "a")
checkerror("invalid use of '%%'", string.gsub, "alo", ".", "%x")
if not _soft then
print("big strings")
local a = string.rep('a', 300000)
assert(string.find(a, '^a*.?$'))
assert(not string.find(a, '^a*.?b$'))
assert(string.find(a, '^a-.?$'))
-- bug in 5.1.2
a = string.rep('a', 10000) .. string.rep('b', 10000)
assert(not pcall(string.gsub, a, 'b'))
end
-- recursive nest of gsubs
function rev (s)
return string.gsub(s, "(.)(.+)", function (c,s1) return rev(s1)..c end)
end
local x = "abcdef"
assert(rev(rev(x)) == x)
-- gsub with tables
assert(string.gsub("alo alo", ".", {}) == "alo alo")
assert(string.gsub("alo alo", "(.)", {a="AA", l=""}) == "AAo AAo")
assert(string.gsub("alo alo", "(.).", {a="AA", l="K"}) == "AAo AAo")
assert(string.gsub("alo alo", "((.)(.?))", {al="AA", o=false}) == "AAo AAo")
assert(string.gsub("alo alo", "().", {'x','yy','zzz'}) == "xyyzzz alo")
t = {}; setmetatable(t, {__index = function (t,s) return string.upper(s) end})
assert(string.gsub("a alo b hi", "%w%w+", t) == "a ALO b HI")
-- tests for gmatch
local a = 0
for i in string.gmatch('abcde', '()') do assert(i == a+1); a=i end
assert(a==6)
t = {n=0}
for w in string.gmatch("first second word", "%w+") do
t.n=t.n+1; t[t.n] = w
end
assert(t[1] == "first" and t[2] == "second" and t[3] == "word")
t = {3, 6, 9}
for i in string.gmatch ("xuxx uu ppar r", "()(.)%2") do
assert(i == table.remove(t, 1))
end
assert(#t == 0)
t = {}
for i,j in string.gmatch("13 14 10 = 11, 15= 16, 22=23", "(%d+)%s*=%s*(%d+)") do
t[tonumber(i)] = tonumber(j)
end
a = 0
for k,v in pairs(t) do assert(k+1 == v+0); a=a+1 end
assert(a == 3)
do -- init parameter in gmatch
local s = 0
for k in string.gmatch("10 20 30", "%d+", 3) do
s = s + tonumber(k)
end
assert(s == 50)
s = 0
for k in string.gmatch("11 21 31", "%d+", -4) do
s = s + tonumber(k)
end
assert(s == 32)
-- there is an empty string at the end of the subject
s = 0
for k in string.gmatch("11 21 31", "%w*", 9) do
s = s + 1
end
assert(s == 1)
-- there are no empty strings after the end of the subject
s = 0
for k in string.gmatch("11 21 31", "%w*", 10) do
s = s + 1
end
assert(s == 0)
end
-- tests for `%f' (`frontiers')
assert(string.gsub("aaa aa a aaa a", "%f[%w]a", "x") == "xaa xa x xaa x")
assert(string.gsub("[[]] [][] [[[[", "%f[[].", "x") == "x[]] x]x] x[[[")
assert(string.gsub("01abc45de3", "%f[%d]", ".") == ".01abc.45de.3")
assert(string.gsub("01abc45 de3x", "%f[%D]%w", ".") == "01.bc45 de3.")
assert(string.gsub("function", "%f[\1-\255]%w", ".") == ".unction")
assert(string.gsub("function", "%f[^\1-\255]", ".") == "function.")
assert(string.find("a", "%f[a]") == 1)
assert(string.find("a", "%f[^%z]") == 1)
assert(string.find("a", "%f[^%l]") == 2)
assert(string.find("aba", "%f[a%z]") == 3)
assert(string.find("aba", "%f[%z]") == 4)
assert(not string.find("aba", "%f[%l%z]"))
assert(not string.find("aba", "%f[^%l%z]"))
local i, e = string.find(" alo aalo allo", "%f[%S].-%f[%s].-%f[%S]")
assert(i == 2 and e == 5)
local k = string.match(" alo aalo allo", "%f[%S](.-%f[%s].-%f[%S])")
assert(k == 'alo ')
local a = {1, 5, 9, 14, 17,}
for k in string.gmatch("alo alo th02 is 1hat", "()%f[%w%d]") do
assert(table.remove(a, 1) == k)
end
assert(#a == 0)
-- malformed patterns
local function malform (p, m)
m = m or "malformed"
local r, msg = pcall(string.find, "a", p)
assert(not r and string.find(msg, m))
end
malform("(.", "unfinished capture")
malform(".)", "invalid pattern capture")
malform("[a")
malform("[]")
malform("[^]")
malform("[a%]")
malform("[a%")
malform("%b")
malform("%ba")
malform("%")
malform("%f", "missing")
-- \0 in patterns
assert(string.match("ab\0\1\2c", "[\0-\2]+") == "\0\1\2")
assert(string.match("ab\0\1\2c", "[\0-\0]+") == "\0")
assert(string.find("b$a", "$\0?") == 2)
assert(string.find("abc\0efg", "%\0") == 4)
assert(string.match("abc\0efg\0\1e\1g", "%b\0\1") == "\0efg\0\1e\1")
assert(string.match("abc\0\0\0", "%\0+") == "\0\0\0")
assert(string.match("abc\0\0\0", "%\0%\0?") == "\0\0")
-- magic char after \0
assert(string.find("abc\0\0","\0.") == 4)
assert(string.find("abcx\0\0abc\0abc","x\0\0abc\0a.") == 4)
do -- test reuse of original string in gsub
local s = string.rep("a", 100)
local r = string.gsub(s, "b", "c") -- no match
assert(string.format("%p", s) == string.format("%p", r))
r = string.gsub(s, ".", {x = "y"}) -- no substitutions
assert(string.format("%p", s) == string.format("%p", r))
local count = 0
r = string.gsub(s, ".", function (x)
assert(x == "a")
count = count + 1
return nil -- no substitution
end)
r = string.gsub(r, ".", {b = 'x'}) -- "a" is not a key; no subst.
assert(count == 100)
assert(string.format("%p", s) == string.format("%p", r))
count = 0
r = string.gsub(s, ".", function (x)
assert(x == "a")
count = count + 1
return x -- substitution...
end)
assert(count == 100)
-- no reuse in this case
assert(r == s and string.format("%p", s) ~= string.format("%p", r))
end
print('OK')
SORT¶
-- $Id: testes/sort.lua $
-- See Copyright Notice in file all.lua
print "testing (parts of) table library"
print "testing unpack"
local unpack = table.unpack
local maxI = math.maxinteger
local minI = math.mininteger
local function checkerror (msg, f, ...)
local s, err = pcall(f, ...)
assert(not s and string.find(err, msg))
end
checkerror("wrong number of arguments", table.insert, {}, 2, 3, 4)
local x,y,z,a,n
a = {}; lim = _soft and 200 or 2000
for i=1, lim do a[i]=i end
assert(select(lim, unpack(a)) == lim and select('#', unpack(a)) == lim)
x = unpack(a)
assert(x == 1)
x = {unpack(a)}
assert(#x == lim and x[1] == 1 and x[lim] == lim)
x = {unpack(a, lim-2)}
assert(#x == 3 and x[1] == lim-2 and x[3] == lim)
x = {unpack(a, 10, 6)}
assert(next(x) == nil) -- no elements
x = {unpack(a, 11, 10)}
assert(next(x) == nil) -- no elements
x,y = unpack(a, 10, 10)
assert(x == 10 and y == nil)
x,y,z = unpack(a, 10, 11)
assert(x == 10 and y == 11 and z == nil)
a,x = unpack{1}
assert(a==1 and x==nil)
a,x = unpack({1,2}, 1, 1)
assert(a==1 and x==nil)
do
local maxi = (1 << 31) - 1 -- maximum value for an int (usually)
local mini = -(1 << 31) -- minimum value for an int (usually)
checkerror("too many results", unpack, {}, 0, maxi)
checkerror("too many results", unpack, {}, 1, maxi)
checkerror("too many results", unpack, {}, 0, maxI)
checkerror("too many results", unpack, {}, 1, maxI)
checkerror("too many results", unpack, {}, mini, maxi)
checkerror("too many results", unpack, {}, -maxi, maxi)
checkerror("too many results", unpack, {}, minI, maxI)
unpack({}, maxi, 0)
unpack({}, maxi, 1)
unpack({}, maxI, minI)
pcall(unpack, {}, 1, maxi + 1)
local a, b = unpack({[maxi] = 20}, maxi, maxi)
assert(a == 20 and b == nil)
a, b = unpack({[maxi] = 20}, maxi - 1, maxi)
assert(a == nil and b == 20)
local t = {[maxI - 1] = 12, [maxI] = 23}
a, b = unpack(t, maxI - 1, maxI); assert(a == 12 and b == 23)
a, b = unpack(t, maxI, maxI); assert(a == 23 and b == nil)
a, b = unpack(t, maxI, maxI - 1); assert(a == nil and b == nil)
t = {[minI] = 12.3, [minI + 1] = 23.5}
a, b = unpack(t, minI, minI + 1); assert(a == 12.3 and b == 23.5)
a, b = unpack(t, minI, minI); assert(a == 12.3 and b == nil)
a, b = unpack(t, minI + 1, minI); assert(a == nil and b == nil)
end
do -- length is not an integer
local t = setmetatable({}, {__len = function () return 'abc' end})
assert(#t == 'abc')
checkerror("object length is not an integer", table.insert, t, 1)
end
print "testing pack"
a = table.pack()
assert(a[1] == undef and a.n == 0)
a = table.pack(table)
assert(a[1] == table and a.n == 1)
a = table.pack(nil, nil, nil, nil)
assert(a[1] == nil and a.n == 4)
-- testing move
do
checkerror("table expected", table.move, 1, 2, 3, 4)
local function eqT (a, b)
for k, v in pairs(a) do assert(b[k] == v) end
for k, v in pairs(b) do assert(a[k] == v) end
end
local a = table.move({10,20,30}, 1, 3, 2) -- move forward
eqT(a, {10,10,20,30})
-- move forward with overlap of 1
a = table.move({10, 20, 30}, 1, 3, 3)
eqT(a, {10, 20, 10, 20, 30})
-- moving to the same table (not being explicit about it)
a = {10, 20, 30, 40}
table.move(a, 1, 4, 2, a)
eqT(a, {10, 10, 20, 30, 40})
a = table.move({10,20,30}, 2, 3, 1) -- move backward
eqT(a, {20,30,30})
a = {} -- move to new table
assert(table.move({10,20,30}, 1, 3, 1, a) == a)
eqT(a, {10,20,30})
a = {}
assert(table.move({10,20,30}, 1, 0, 3, a) == a) -- empty move (no move)
eqT(a, {})
a = table.move({10,20,30}, 1, 10, 1) -- move to the same place
eqT(a, {10,20,30})
-- moving on the fringes
a = table.move({[maxI - 2] = 1, [maxI - 1] = 2, [maxI] = 3},
maxI - 2, maxI, -10, {})
eqT(a, {[-10] = 1, [-9] = 2, [-8] = 3})
a = table.move({[minI] = 1, [minI + 1] = 2, [minI + 2] = 3},
minI, minI + 2, -10, {})
eqT(a, {[-10] = 1, [-9] = 2, [-8] = 3})
a = table.move({45}, 1, 1, maxI)
eqT(a, {45, [maxI] = 45})
a = table.move({[maxI] = 100}, maxI, maxI, minI)
eqT(a, {[minI] = 100, [maxI] = 100})
a = table.move({[minI] = 100}, minI, minI, maxI)
eqT(a, {[minI] = 100, [maxI] = 100})
a = setmetatable({}, {
__index = function (_,k) return k * 10 end,
__newindex = error})
local b = table.move(a, 1, 10, 3, {})
eqT(a, {})
eqT(b, {nil,nil,10,20,30,40,50,60,70,80,90,100})
b = setmetatable({""}, {
__index = error,
__newindex = function (t,k,v)
t[1] = string.format("%s(%d,%d)", t[1], k, v)
end})
table.move(a, 10, 13, 3, b)
assert(b[1] == "(3,100)(4,110)(5,120)(6,130)")
local stat, msg = pcall(table.move, b, 10, 13, 3, b)
assert(not stat and msg == b)
end
do
-- for very long moves, just check initial accesses and interrupt
-- move with an error
local function checkmove (f, e, t, x, y)
local pos1, pos2
local a = setmetatable({}, {
__index = function (_,k) pos1 = k end,
__newindex = function (_,k) pos2 = k; error() end, })
local st, msg = pcall(table.move, a, f, e, t)
assert(not st and not msg and pos1 == x and pos2 == y)
end
checkmove(1, maxI, 0, 1, 0)
checkmove(0, maxI - 1, 1, maxI - 1, maxI)
checkmove(minI, -2, -5, -2, maxI - 6)
checkmove(minI + 1, -1, -2, -1, maxI - 3)
checkmove(minI, -2, 0, minI, 0) -- non overlapping
checkmove(minI + 1, -1, 1, minI + 1, 1) -- non overlapping
end
checkerror("too many", table.move, {}, 0, maxI, 1)
checkerror("too many", table.move, {}, -1, maxI - 1, 1)
checkerror("too many", table.move, {}, minI, -1, 1)
checkerror("too many", table.move, {}, minI, maxI, 1)
checkerror("wrap around", table.move, {}, 1, maxI, 2)
checkerror("wrap around", table.move, {}, 1, 2, maxI)
checkerror("wrap around", table.move, {}, minI, -2, 2)
print"testing sort"
-- strange lengths
local a = setmetatable({}, {__len = function () return -1 end})
assert(#a == -1)
table.sort(a, error) -- should not compare anything
a = setmetatable({}, {__len = function () return maxI end})
checkerror("too big", table.sort, a)
-- test checks for invalid order functions
local function check (t)
local function f(a, b) assert(a and b); return true end
checkerror("invalid order function", table.sort, t, f)
end
check{1,2,3,4}
check{1,2,3,4,5}
check{1,2,3,4,5,6}
function check (a, f)
f = f or function (x,y) return x<y end;
for n = #a, 2, -1 do
assert(not f(a[n], a[n-1]))
end
end
a = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep",
"Oct", "Nov", "Dec"}
table.sort(a)
check(a)
function perm (s, n)
n = n or #s
if n == 1 then
local t = {unpack(s)}
table.sort(t)
check(t)
else
for i = 1, n do
s[i], s[n] = s[n], s[i]
perm(s, n - 1)
s[i], s[n] = s[n], s[i]
end
end
end
perm{}
perm{1}
perm{1,2}
perm{1,2,3}
perm{1,2,3,4}
perm{2,2,3,4}
perm{1,2,3,4,5}
perm{1,2,3,3,5}
perm{1,2,3,4,5,6}
perm{2,2,3,3,5,6}
function timesort (a, n, func, msg, pre)
local x = os.clock()
table.sort(a, func)
x = (os.clock() - x) * 1000
pre = pre or ""
print(string.format("%ssorting %d %s elements in %.2f msec.", pre, n, msg, x))
check(a, func)
end
limit = 50000
if _soft then limit = 5000 end
a = {}
for i=1,limit do
a[i] = math.random()
end
timesort(a, limit, nil, "random")
timesort(a, limit, nil, "sorted", "re-")
a = {}
for i=1,limit do
a[i] = math.random()
end
x = os.clock(); i=0
table.sort(a, function(x,y) i=i+1; return y<x end)
x = (os.clock() - x) * 1000
print(string.format("Invert-sorting other %d elements in %.2f msec., with %i comparisons",
limit, x, i))
check(a, function(x,y) return y<x end)
table.sort{} -- empty array
for i=1,limit do a[i] = false end
timesort(a, limit, function(x,y) return nil end, "equal")
for i,v in pairs(a) do assert(v == false) end
A = {"álo", "\0first :-)", "alo", "then this one", "45", "and a new"}
table.sort(A)
check(A)
table.sort(A, function (x, y)
load(string.format("A[%q] = ''", x), "")()
collectgarbage()
return x<y
end)
tt = {__lt = function (a,b) return a.val < b.val end}
a = {}
for i=1,10 do a[i] = {val=math.random(100)}; setmetatable(a[i], tt); end
table.sort(a)
check(a, tt.__lt)
check(a)
print"OK"
STRINGS¶
-- $Id: testes/strings.lua $
-- See Copyright Notice in file all.lua
print('testing strings and string library')
local maxi <const> = math.maxinteger
local mini <const> = math.mininteger
local function checkerror (msg, f, ...)
local s, err = pcall(f, ...)
assert(not s and string.find(err, msg))
end
-- testing string comparisons
assert('alo' < 'alo1')
assert('' < 'a')
assert('alo\0alo' < 'alo\0b')
assert('alo\0alo\0\0' > 'alo\0alo\0')
assert('alo' < 'alo\0')
assert('alo\0' > 'alo')
assert('\0' < '\1')
assert('\0\0' < '\0\1')
assert('\1\0a\0a' <= '\1\0a\0a')
assert(not ('\1\0a\0b' <= '\1\0a\0a'))
assert('\0\0\0' < '\0\0\0\0')
assert(not('\0\0\0\0' < '\0\0\0'))
assert('\0\0\0' <= '\0\0\0\0')
assert(not('\0\0\0\0' <= '\0\0\0'))
assert('\0\0\0' <= '\0\0\0')
assert('\0\0\0' >= '\0\0\0')
assert(not ('\0\0b' < '\0\0a\0'))
-- testing string.sub
assert(string.sub("123456789",2,4) == "234")
assert(string.sub("123456789",7) == "789")
assert(string.sub("123456789",7,6) == "")
assert(string.sub("123456789",7,7) == "7")
assert(string.sub("123456789",0,0) == "")
assert(string.sub("123456789",-10,10) == "123456789")
assert(string.sub("123456789",1,9) == "123456789")
assert(string.sub("123456789",-10,-20) == "")
assert(string.sub("123456789",-1) == "9")
assert(string.sub("123456789",-4) == "6789")
assert(string.sub("123456789",-6, -4) == "456")
assert(string.sub("123456789", mini, -4) == "123456")
assert(string.sub("123456789", mini, maxi) == "123456789")
assert(string.sub("123456789", mini, mini) == "")
assert(string.sub("\000123456789",3,5) == "234")
assert(("\000123456789"):sub(8) == "789")
-- testing string.find
assert(string.find("123456789", "345") == 3)
a,b = string.find("123456789", "345")
assert(string.sub("123456789", a, b) == "345")
assert(string.find("1234567890123456789", "345", 3) == 3)
assert(string.find("1234567890123456789", "345", 4) == 13)
assert(not string.find("1234567890123456789", "346", 4))
assert(string.find("1234567890123456789", ".45", -9) == 13)
assert(not string.find("abcdefg", "\0", 5, 1))
assert(string.find("", "") == 1)
assert(string.find("", "", 1) == 1)
assert(not string.find("", "", 2))
assert(not string.find('', 'aaa', 1))
assert(('alo(.)alo'):find('(.)', 1, 1) == 4)
assert(string.len("") == 0)
assert(string.len("\0\0\0") == 3)
assert(string.len("1234567890") == 10)
assert(#"" == 0)
assert(#"\0\0\0" == 3)
assert(#"1234567890" == 10)
-- testing string.byte/string.char
assert(string.byte("a") == 97)
assert(string.byte("\xe4") > 127)
assert(string.byte(string.char(255)) == 255)
assert(string.byte(string.char(0)) == 0)
assert(string.byte("\0") == 0)
assert(string.byte("\0\0alo\0x", -1) == string.byte('x'))
assert(string.byte("ba", 2) == 97)
assert(string.byte("\n\n", 2, -1) == 10)
assert(string.byte("\n\n", 2, 2) == 10)
assert(string.byte("") == nil)
assert(string.byte("hi", -3) == nil)
assert(string.byte("hi", 3) == nil)
assert(string.byte("hi", 9, 10) == nil)
assert(string.byte("hi", 2, 1) == nil)
assert(string.char() == "")
assert(string.char(0, 255, 0) == "\0\255\0")
assert(string.char(0, string.byte("\xe4"), 0) == "\0\xe4\0")
assert(string.char(string.byte("\xe4l\0óu", 1, -1)) == "\xe4l\0óu")
assert(string.char(string.byte("\xe4l\0óu", 1, 0)) == "")
assert(string.char(string.byte("\xe4l\0óu", -10, 100)) == "\xe4l\0óu")
checkerror("out of range", string.char, 256)
checkerror("out of range", string.char, -1)
checkerror("out of range", string.char, math.maxinteger)
checkerror("out of range", string.char, math.mininteger)
assert(string.upper("ab\0c") == "AB\0C")
assert(string.lower("\0ABCc%$") == "\0abcc%$")
assert(string.rep('teste', 0) == '')
assert(string.rep('tés\00tê', 2) == 'tés\0têtés\000tê')
assert(string.rep('', 10) == '')
if string.packsize("i") == 4 then
-- result length would be 2^31 (int overflow)
checkerror("too large", string.rep, 'aa', (1 << 30))
checkerror("too large", string.rep, 'a', (1 << 30), ',')
end
-- repetitions with separator
assert(string.rep('teste', 0, 'xuxu') == '')
assert(string.rep('teste', 1, 'xuxu') == 'teste')
assert(string.rep('\1\0\1', 2, '\0\0') == '\1\0\1\0\0\1\0\1')
assert(string.rep('', 10, '.') == string.rep('.', 9))
assert(not pcall(string.rep, "aa", maxi // 2 + 10))
assert(not pcall(string.rep, "", maxi // 2 + 10, "aa"))
assert(string.reverse"" == "")
assert(string.reverse"\0\1\2\3" == "\3\2\1\0")
assert(string.reverse"\0001234" == "4321\0")
for i=0,30 do assert(string.len(string.rep('a', i)) == i) end
assert(type(tostring(nil)) == 'string')
assert(type(tostring(12)) == 'string')
assert(string.find(tostring{}, 'table:'))
assert(string.find(tostring(print), 'function:'))
assert(#tostring('\0') == 1)
assert(tostring(true) == "true")
assert(tostring(false) == "false")
assert(tostring(-1203) == "-1203")
assert(tostring(1203.125) == "1203.125")
assert(tostring(-0.5) == "-0.5")
assert(tostring(-32767) == "-32767")
if math.tointeger(2147483647) then -- no overflow? (32 bits)
assert(tostring(-2147483647) == "-2147483647")
end
if math.tointeger(4611686018427387904) then -- no overflow? (64 bits)
assert(tostring(4611686018427387904) == "4611686018427387904")
assert(tostring(-4611686018427387904) == "-4611686018427387904")
end
if tostring(0.0) == "0.0" then -- "standard" coercion float->string
assert('' .. 12 == '12' and 12.0 .. '' == '12.0')
assert(tostring(-1203 + 0.0) == "-1203.0")
else -- compatible coercion
assert(tostring(0.0) == "0")
assert('' .. 12 == '12' and 12.0 .. '' == '12')
assert(tostring(-1203 + 0.0) == "-1203")
end
do -- tests for '%p' format
-- not much to test, as C does not specify what '%p' does.
-- ("The value of the pointer is converted to a sequence of printing
-- characters, in an implementation-defined manner.")
local null = "(null)" -- nulls are formatted by Lua
assert(string.format("%p", 4) == null)
assert(string.format("%p", true) == null)
assert(string.format("%p", nil) == null)
assert(string.format("%p", {}) ~= null)
assert(string.format("%p", print) ~= null)
assert(string.format("%p", coroutine.running()) ~= null)
assert(string.format("%p", io.stdin) ~= null)
assert(string.format("%p", io.stdin) == string.format("%p", io.stdin))
assert(string.format("%p", print) == string.format("%p", print))
assert(string.format("%p", print) ~= string.format("%p", assert))
assert(#string.format("%90p", {}) == 90)
assert(#string.format("%-60p", {}) == 60)
assert(string.format("%10p", false) == string.rep(" ", 10 - #null) .. null)
assert(string.format("%-12p", 1.5) == null .. string.rep(" ", 12 - #null))
do
local t1 = {}; local t2 = {}
assert(string.format("%p", t1) ~= string.format("%p", t2))
end
do -- short strings are internalized
local s1 = string.rep("a", 10)
local s2 = string.rep("aa", 5)
assert(string.format("%p", s1) == string.format("%p", s2))
end
do -- long strings aren't internalized
local s1 = string.rep("a", 300); local s2 = string.rep("a", 300)
assert(string.format("%p", s1) ~= string.format("%p", s2))
end
end
x = '"ílo"\n\\'
assert(string.format('%q%s', x, x) == '"\\"ílo\\"\\\n\\\\""ílo"\n\\')
assert(string.format('%q', "\0") == [["\0"]])
assert(load(string.format('return %q', x))() == x)
x = "\0\1\0023\5\0009"
assert(load(string.format('return %q', x))() == x)
assert(string.format("\0%c\0%c%x\0", string.byte("\xe4"), string.byte("b"), 140) ==
"\0\xe4\0b8c\0")
assert(string.format('') == "")
assert(string.format("%c",34)..string.format("%c",48)..string.format("%c",90)..string.format("%c",100) ==
string.format("%c%c%c%c", 34, 48, 90, 100))
assert(string.format("%s\0 is not \0%s", 'not be', 'be') == 'not be\0 is not \0be')
assert(string.format("%%%d %010d", 10, 23) == "%10 0000000023")
assert(tonumber(string.format("%f", 10.3)) == 10.3)
x = string.format('"%-50s"', 'a')
assert(#x == 52)
assert(string.sub(x, 1, 4) == '"a ')
assert(string.format("-%.20s.20s", string.rep("%", 2000)) ==
"-"..string.rep("%", 20)..".20s")
assert(string.format('"-%20s.20s"', string.rep("%", 2000)) ==
string.format("%q", "-"..string.rep("%", 2000)..".20s"))
do
local function checkQ (v)
local s = string.format("%q", v)
local nv = load("return " .. s)()
assert(v == nv and math.type(v) == math.type(nv))
end
checkQ("\0\0\1\255\u{234}")
checkQ(math.maxinteger)
checkQ(math.mininteger)
checkQ(math.pi)
checkQ(0.1)
checkQ(true)
checkQ(nil)
checkQ(false)
checkQ(math.huge)
checkQ(-math.huge)
assert(string.format("%q", 0/0) == "(0/0)") -- NaN
checkerror("no literal", string.format, "%q", {})
end
assert(string.format("\0%s\0", "\0\0\1") == "\0\0\0\1\0")
checkerror("contains zeros", string.format, "%10s", "\0")
checkerror("cannot have modifiers", string.format, "%10q", "1")
-- format x tostring
assert(string.format("%s %s", nil, true) == "nil true")
assert(string.format("%s %.4s", false, true) == "false true")
assert(string.format("%.3s %.3s", false, true) == "fal tru")
local m = setmetatable({}, {__tostring = function () return "hello" end,
__name = "hi"})
assert(string.format("%s %.10s", m, m) == "hello hello")
getmetatable(m).__tostring = nil -- will use '__name' from now on
assert(string.format("%.4s", m) == "hi: ")
getmetatable(m).__tostring = function () return {} end
checkerror("'__tostring' must return a string", tostring, m)
assert(string.format("%x", 0.0) == "0")
assert(string.format("%02x", 0.0) == "00")
assert(string.format("%08X", 0xFFFFFFFF) == "FFFFFFFF")
assert(string.format("%+08d", 31501) == "+0031501")
assert(string.format("%+08d", -30927) == "-0030927")
do -- longest number that can be formatted
local i = 1
local j = 10000
while i + 1 < j do -- binary search for maximum finite float
local m = (i + j) // 2
if 10^m < math.huge then i = m else j = m end
end
assert(10^i < math.huge and 10^j == math.huge)
local s = string.format('%.99f', -(10^i))
assert(string.len(s) >= i + 101)
assert(tonumber(s) == -(10^i))
-- limit for floats
assert(10^38 < math.huge)
local s = string.format('%.99f', -(10^38))
assert(string.len(s) >= 38 + 101)
assert(tonumber(s) == -(10^38))
end
-- testing large numbers for format
do -- assume at least 32 bits
local max, min = 0x7fffffff, -0x80000000 -- "large" for 32 bits
assert(string.sub(string.format("%8x", -1), -8) == "ffffffff")
assert(string.format("%x", max) == "7fffffff")
assert(string.sub(string.format("%x", min), -8) == "80000000")
assert(string.format("%d", max) == "2147483647")
assert(string.format("%d", min) == "-2147483648")
assert(string.format("%u", 0xffffffff) == "4294967295")
assert(string.format("%o", 0xABCD) == "125715")
max, min = 0x7fffffffffffffff, -0x8000000000000000
if max > 2.0^53 then -- only for 64 bits
assert(string.format("%x", (2^52 | 0) - 1) == "fffffffffffff")
assert(string.format("0x%8X", 0x8f000003) == "0x8F000003")
assert(string.format("%d", 2^53) == "9007199254740992")
assert(string.format("%i", -2^53) == "-9007199254740992")
assert(string.format("%x", max) == "7fffffffffffffff")
assert(string.format("%x", min) == "8000000000000000")
assert(string.format("%d", max) == "9223372036854775807")
assert(string.format("%d", min) == "-9223372036854775808")
assert(string.format("%u", ~(-1 << 64)) == "18446744073709551615")
assert(tostring(1234567890123) == '1234567890123')
end
end
do print("testing 'format %a %A'")
local function matchhexa (n)
local s = string.format("%a", n)
-- result matches ISO C requirements
assert(string.find(s, "^%-?0x[1-9a-f]%.?[0-9a-f]*p[-+]?%d+$"))
assert(tonumber(s) == n) -- and has full precision
s = string.format("%A", n)
assert(string.find(s, "^%-?0X[1-9A-F]%.?[0-9A-F]*P[-+]?%d+$"))
assert(tonumber(s) == n)
end
for _, n in ipairs{0.1, -0.1, 1/3, -1/3, 1e30, -1e30,
-45/247, 1, -1, 2, -2, 3e-20, -3e-20} do
matchhexa(n)
end
assert(string.find(string.format("%A", 0.0), "^0X0%.?0*P%+?0$"))
assert(string.find(string.format("%a", -0.0), "^%-0x0%.?0*p%+?0$"))
if not _port then -- test inf, -inf, NaN, and -0.0
assert(string.find(string.format("%a", 1/0), "^inf"))
assert(string.find(string.format("%A", -1/0), "^%-INF"))
assert(string.find(string.format("%a", 0/0), "^%-?nan"))
assert(string.find(string.format("%a", -0.0), "^%-0x0"))
end
if not pcall(string.format, "%.3a", 0) then
(Message or print)("\n >>> modifiers for format '%a' not available <<<\n")
else
assert(string.find(string.format("%+.2A", 12), "^%+0X%x%.%x0P%+?%d$"))
assert(string.find(string.format("%.4A", -12), "^%-0X%x%.%x000P%+?%d$"))
end
end
-- errors in format
local function check (fmt, msg)
checkerror(msg, string.format, fmt, 10)
end
local aux = string.rep('0', 600)
check("%100.3d", "too long")
check("%1"..aux..".3d", "too long")
check("%1.100d", "too long")
check("%10.1"..aux.."004d", "too long")
check("%t", "invalid conversion")
check("%"..aux.."d", "repeated flags")
check("%d %d", "no value")
assert(load("return 1\n--comment without ending EOL")() == 1)
checkerror("table expected", table.concat, 3)
assert(table.concat{} == "")
assert(table.concat({}, 'x') == "")
assert(table.concat({'\0', '\0\1', '\0\1\2'}, '.\0.') == "\0.\0.\0\1.\0.\0\1\2")
local a = {}; for i=1,300 do a[i] = "xuxu" end
assert(table.concat(a, "123").."123" == string.rep("xuxu123", 300))
assert(table.concat(a, "b", 20, 20) == "xuxu")
assert(table.concat(a, "", 20, 21) == "xuxuxuxu")
assert(table.concat(a, "x", 22, 21) == "")
assert(table.concat(a, "3", 299) == "xuxu3xuxu")
assert(table.concat({}, "x", maxi, maxi - 1) == "")
assert(table.concat({}, "x", mini + 1, mini) == "")
assert(table.concat({}, "x", maxi, mini) == "")
assert(table.concat({[maxi] = "alo"}, "x", maxi, maxi) == "alo")
assert(table.concat({[maxi] = "alo", [maxi - 1] = "y"}, "-", maxi - 1, maxi)
== "y-alo")
assert(not pcall(table.concat, {"a", "b", {}}))
a = {"a","b","c"}
assert(table.concat(a, ",", 1, 0) == "")
assert(table.concat(a, ",", 1, 1) == "a")
assert(table.concat(a, ",", 1, 2) == "a,b")
assert(table.concat(a, ",", 2) == "b,c")
assert(table.concat(a, ",", 3) == "c")
assert(table.concat(a, ",", 4) == "")
if not _port then
local locales = { "ptb", "pt_BR.iso88591", "ISO-8859-1" }
local function trylocale (w)
for i = 1, #locales do
if os.setlocale(locales[i], w) then
print(string.format("'%s' locale set to '%s'", w, locales[i]))
return locales[i]
end
end
print(string.format("'%s' locale not found", w))
return false
end
if trylocale("collate") then
assert("alo" < "álo" and "álo" < "amo")
end
if trylocale("ctype") then
assert(string.gsub("áéíóú", "%a", "x") == "xxxxx")
assert(string.gsub("áÁéÉ", "%l", "x") == "xÁxÉ")
assert(string.gsub("áÁéÉ", "%u", "x") == "áxéx")
assert(string.upper"áÁé{xuxu}ção" == "ÁÁÉ{XUXU}ÇÃO")
end
os.setlocale("C")
assert(os.setlocale() == 'C')
assert(os.setlocale(nil, "numeric") == 'C')
end
-- bug in Lua 5.3.2
-- 'gmatch' iterator does not work across coroutines
do
local f = string.gmatch("1 2 3 4 5", "%d+")
assert(f() == "1")
co = coroutine.wrap(f)
assert(co() == "2")
end
if T==nil then
(Message or print)
("\n >>> testC not active: skipping 'pushfstring' tests <<<\n")
else
print"testing 'pushfstring'"
-- formats %U, %f, %I already tested elsewhere
local blen = 400 -- internal buffer length in 'luaO_pushfstring'
local function callpfs (op, fmt, n)
local x = {T.testC("pushfstring" .. op .. "; return *", fmt, n)}
-- stack has code, 'fmt', 'n', and result from operation
assert(#x == 4) -- make sure nothing else was left in the stack
return x[4]
end
local function testpfs (op, fmt, n)
assert(callpfs(op, fmt, n) == string.format(fmt, n))
end
testpfs("I", "", 0)
testpfs("I", string.rep("a", blen - 1), 0)
testpfs("I", string.rep("a", blen), 0)
testpfs("I", string.rep("a", blen + 1), 0)
local str = string.rep("ab", blen) .. "%d" .. string.rep("d", blen / 2)
testpfs("I", str, 2^14)
testpfs("I", str, -2^15)
str = "%d" .. string.rep("cd", blen)
testpfs("I", str, 2^14)
testpfs("I", str, -2^15)
str = string.rep("c", blen - 2) .. "%d"
testpfs("I", str, 2^14)
testpfs("I", str, -2^15)
for l = 12, 14 do
local str1 = string.rep("a", l)
for i = 0, 500, 13 do
for j = 0, 500, 13 do
str = string.rep("a", i) .. "%s" .. string.rep("d", j)
testpfs("S", str, str1)
testpfs("S", str, str)
end
end
end
str = "abc %c def"
testpfs("I", str, string.byte("A"))
testpfs("I", str, 255)
str = string.rep("a", blen - 1) .. "%p" .. string.rep("cd", blen)
testpfs("P", str, {})
str = string.rep("%%", 3 * blen) .. "%p" .. string.rep("%%", 2 * blen)
testpfs("P", str, {})
end
print('OK')
TPACK¶
-- $Id: testes/tpack.lua $
-- See Copyright Notice in file all.lua
local pack = string.pack
local packsize = string.packsize
local unpack = string.unpack
print "testing pack/unpack"
-- maximum size for integers
local NB = 16
local sizeshort = packsize("h")
local sizeint = packsize("i")
local sizelong = packsize("l")
local sizesize_t = packsize("T")
local sizeLI = packsize("j")
local sizefloat = packsize("f")
local sizedouble = packsize("d")
local sizenumber = packsize("n")
local little = (pack("i2", 1) == "\1\0")
local align = packsize("!xXi16")
assert(1 <= sizeshort and sizeshort <= sizeint and sizeint <= sizelong and
sizefloat <= sizedouble)
print("platform:")
print(string.format(
"\tshort %d, int %d, long %d, size_t %d, float %d, double %d,\n\z
\tlua Integer %d, lua Number %d",
sizeshort, sizeint, sizelong, sizesize_t, sizefloat, sizedouble,
sizeLI, sizenumber))
print("\t" .. (little and "little" or "big") .. " endian")
print("\talignment: " .. align)
-- check errors in arguments
function checkerror (msg, f, ...)
local status, err = pcall(f, ...)
-- print(status, err, msg)
assert(not status and string.find(err, msg))
end
-- minimum behavior for integer formats
assert(unpack("B", pack("B", 0xff)) == 0xff)
assert(unpack("b", pack("b", 0x7f)) == 0x7f)
assert(unpack("b", pack("b", -0x80)) == -0x80)
assert(unpack("H", pack("H", 0xffff)) == 0xffff)
assert(unpack("h", pack("h", 0x7fff)) == 0x7fff)
assert(unpack("h", pack("h", -0x8000)) == -0x8000)
assert(unpack("L", pack("L", 0xffffffff)) == 0xffffffff)
assert(unpack("l", pack("l", 0x7fffffff)) == 0x7fffffff)
assert(unpack("l", pack("l", -0x80000000)) == -0x80000000)
for i = 1, NB do
-- small numbers with signal extension ("\xFF...")
local s = string.rep("\xff", i)
assert(pack("i" .. i, -1) == s)
assert(packsize("i" .. i) == #s)
assert(unpack("i" .. i, s) == -1)
-- small unsigned number ("\0...\xAA")
s = "\xAA" .. string.rep("\0", i - 1)
assert(pack("<I" .. i, 0xAA) == s)
assert(unpack("<I" .. i, s) == 0xAA)
assert(pack(">I" .. i, 0xAA) == s:reverse())
assert(unpack(">I" .. i, s:reverse()) == 0xAA)
end
do
local lnum = 0x13121110090807060504030201
local s = pack("<j", lnum)
assert(unpack("<j", s) == lnum)
assert(unpack("<i" .. sizeLI + 1, s .. "\0") == lnum)
assert(unpack("<i" .. sizeLI + 1, s .. "\0") == lnum)
for i = sizeLI + 1, NB do
local s = pack("<j", -lnum)
assert(unpack("<j", s) == -lnum)
-- strings with (correct) extra bytes
assert(unpack("<i" .. i, s .. ("\xFF"):rep(i - sizeLI)) == -lnum)
assert(unpack(">i" .. i, ("\xFF"):rep(i - sizeLI) .. s:reverse()) == -lnum)
assert(unpack("<I" .. i, s .. ("\0"):rep(i - sizeLI)) == -lnum)
-- overflows
checkerror("does not fit", unpack, "<I" .. i, ("\x00"):rep(i - 1) .. "\1")
checkerror("does not fit", unpack, ">i" .. i, "\1" .. ("\x00"):rep(i - 1))
end
end
for i = 1, sizeLI do
local lstr = "\1\2\3\4\5\6\7\8\9\10\11\12\13"
local lnum = 0x13121110090807060504030201
local n = lnum & (~(-1 << (i * 8)))
local s = string.sub(lstr, 1, i)
assert(pack("<i" .. i, n) == s)
assert(pack(">i" .. i, n) == s:reverse())
assert(unpack(">i" .. i, s:reverse()) == n)
end
-- sign extension
do
local u = 0xf0
for i = 1, sizeLI - 1 do
assert(unpack("<i"..i, "\xf0"..("\xff"):rep(i - 1)) == -16)
assert(unpack(">I"..i, "\xf0"..("\xff"):rep(i - 1)) == u)
u = u * 256 + 0xff
end
end
-- mixed endianness
do
assert(pack(">i2 <i2", 10, 20) == "\0\10\20\0")
local a, b = unpack("<i2 >i2", "\10\0\0\20")
assert(a == 10 and b == 20)
assert(pack("=i4", 2001) == pack("i4", 2001))
end
print("testing invalid formats")
checkerror("out of limits", pack, "i0", 0)
checkerror("out of limits", pack, "i" .. NB + 1, 0)
checkerror("out of limits", pack, "!" .. NB + 1, 0)
checkerror("%(17%) out of limits %[1,16%]", pack, "Xi" .. NB + 1)
checkerror("invalid format option 'r'", pack, "i3r", 0)
checkerror("16%-byte integer", unpack, "i16", string.rep('\3', 16))
checkerror("not power of 2", pack, "!4i3", 0);
checkerror("missing size", pack, "c", "")
checkerror("variable%-length format", packsize, "s")
checkerror("variable%-length format", packsize, "z")
-- overflow in option size (error will be in digit after limit)
checkerror("invalid format", packsize, "c1" .. string.rep("0", 40))
if packsize("i") == 4 then
-- result would be 2^31 (2^3 repetitions of 2^28 strings)
local s = string.rep("c268435456", 2^3)
checkerror("too large", packsize, s)
-- one less is OK
s = string.rep("c268435456", 2^3 - 1) .. "c268435455"
assert(packsize(s) == 0x7fffffff)
end
-- overflow in packing
for i = 1, sizeLI - 1 do
local umax = (1 << (i * 8)) - 1
local max = umax >> 1
local min = ~max
checkerror("overflow", pack, "<I" .. i, -1)
checkerror("overflow", pack, "<I" .. i, min)
checkerror("overflow", pack, ">I" .. i, umax + 1)
checkerror("overflow", pack, ">i" .. i, umax)
checkerror("overflow", pack, ">i" .. i, max + 1)
checkerror("overflow", pack, "<i" .. i, min - 1)
assert(unpack(">i" .. i, pack(">i" .. i, max)) == max)
assert(unpack("<i" .. i, pack("<i" .. i, min)) == min)
assert(unpack(">I" .. i, pack(">I" .. i, umax)) == umax)
end
-- Lua integer size
assert(unpack(">j", pack(">j", math.maxinteger)) == math.maxinteger)
assert(unpack("<j", pack("<j", math.mininteger)) == math.mininteger)
assert(unpack("<J", pack("<j", -1)) == -1) -- maximum unsigned integer
if little then
assert(pack("f", 24) == pack("<f", 24))
else
assert(pack("f", 24) == pack(">f", 24))
end
print "testing pack/unpack of floating-point numbers"
for _, n in ipairs{0, -1.1, 1.9, 1/0, -1/0, 1e20, -1e20, 0.1, 2000.7} do
assert(unpack("n", pack("n", n)) == n)
assert(unpack("<n", pack("<n", n)) == n)
assert(unpack(">n", pack(">n", n)) == n)
assert(pack("<f", n) == pack(">f", n):reverse())
assert(pack(">d", n) == pack("<d", n):reverse())
end
-- for non-native precisions, test only with "round" numbers
for _, n in ipairs{0, -1.5, 1/0, -1/0, 1e10, -1e9, 0.5, 2000.25} do
assert(unpack("<f", pack("<f", n)) == n)
assert(unpack(">f", pack(">f", n)) == n)
assert(unpack("<d", pack("<d", n)) == n)
assert(unpack(">d", pack(">d", n)) == n)
end
print "testing pack/unpack of strings"
do
local s = string.rep("abc", 1000)
assert(pack("zB", s, 247) == s .. "\0\xF7")
local s1, b = unpack("zB", s .. "\0\xF9")
assert(b == 249 and s1 == s)
s1 = pack("s", s)
assert(unpack("s", s1) == s)
checkerror("does not fit", pack, "s1", s)
checkerror("contains zeros", pack, "z", "alo\0");
checkerror("unfinished string", unpack, "zc10000000", "alo")
for i = 2, NB do
local s1 = pack("s" .. i, s)
assert(unpack("s" .. i, s1) == s and #s1 == #s + i)
end
end
do
local x = pack("s", "alo")
checkerror("too short", unpack, "s", x:sub(1, -2))
checkerror("too short", unpack, "c5", "abcd")
checkerror("out of limits", pack, "s100", "alo")
end
do
assert(pack("c0", "") == "")
assert(packsize("c0") == 0)
assert(unpack("c0", "") == "")
assert(pack("<! c3", "abc") == "abc")
assert(packsize("<! c3") == 3)
assert(pack(">!4 c6", "abcdef") == "abcdef")
assert(pack("c3", "123") == "123")
assert(pack("c0", "") == "")
assert(pack("c8", "123456") == "123456\0\0")
assert(pack("c88", "") == string.rep("\0", 88))
assert(pack("c188", "ab") == "ab" .. string.rep("\0", 188 - 2))
local a, b, c = unpack("!4 z c3", "abcdefghi\0xyz")
assert(a == "abcdefghi" and b == "xyz" and c == 14)
checkerror("longer than", pack, "c3", "1234")
end
-- testing multiple types and sequence
do
local x = pack("<b h b f d f n i", 1, 2, 3, 4, 5, 6, 7, 8)
assert(#x == packsize("<b h b f d f n i"))
local a, b, c, d, e, f, g, h = unpack("<b h b f d f n i", x)
assert(a == 1 and b == 2 and c == 3 and d == 4 and e == 5 and f == 6 and
g == 7 and h == 8)
end
print "testing alignment"
do
assert(pack(" < i1 i2 ", 2, 3) == "\2\3\0") -- no alignment by default
local x = pack(">!8 b Xh i4 i8 c1 Xi8", -12, 100, 200, "\xEC")
assert(#x == packsize(">!8 b Xh i4 i8 c1 Xi8"))
assert(x == "\xf4" .. "\0\0\0" ..
"\0\0\0\100" ..
"\0\0\0\0\0\0\0\xC8" ..
"\xEC" .. "\0\0\0\0\0\0\0")
local a, b, c, d, pos = unpack(">!8 c1 Xh i4 i8 b Xi8 XI XH", x)
assert(a == "\xF4" and b == 100 and c == 200 and d == -20 and (pos - 1) == #x)
x = pack(">!4 c3 c4 c2 z i4 c5 c2 Xi4",
"abc", "abcd", "xz", "hello", 5, "world", "xy")
assert(x == "abcabcdxzhello\0\0\0\0\0\5worldxy\0")
local a, b, c, d, e, f, g, pos = unpack(">!4 c3 c4 c2 z i4 c5 c2 Xh Xi4", x)
assert(a == "abc" and b == "abcd" and c == "xz" and d == "hello" and
e == 5 and f == "world" and g == "xy" and (pos - 1) % 4 == 0)
x = pack(" b b Xd b Xb x", 1, 2, 3)
assert(packsize(" b b Xd b Xb x") == 4)
assert(x == "\1\2\3\0")
a, b, c, pos = unpack("bbXdb", x)
assert(a == 1 and b == 2 and c == 3 and pos == #x)
-- only alignment
assert(packsize("!8 xXi8") == 8)
local pos = unpack("!8 xXi8", "0123456701234567"); assert(pos == 9)
assert(packsize("!8 xXi2") == 2)
local pos = unpack("!8 xXi2", "0123456701234567"); assert(pos == 3)
assert(packsize("!2 xXi2") == 2)
local pos = unpack("!2 xXi2", "0123456701234567"); assert(pos == 3)
assert(packsize("!2 xXi8") == 2)
local pos = unpack("!2 xXi8", "0123456701234567"); assert(pos == 3)
assert(packsize("!16 xXi16") == 16)
local pos = unpack("!16 xXi16", "0123456701234567"); assert(pos == 17)
checkerror("invalid next option", pack, "X")
checkerror("invalid next option", unpack, "XXi", "")
checkerror("invalid next option", unpack, "X i", "")
checkerror("invalid next option", pack, "Xc1")
end
do -- testing initial position
local x = pack("i4i4i4i4", 1, 2, 3, 4)
for pos = 1, 16, 4 do
local i, p = unpack("i4", x, pos)
assert(i == pos//4 + 1 and p == pos + 4)
end
-- with alignment
for pos = 0, 12 do -- will always round position to power of 2
local i, p = unpack("!4 i4", x, pos + 1)
assert(i == (pos + 3)//4 + 1 and p == i*4 + 1)
end
-- negative indices
local i, p = unpack("!4 i4", x, -4)
assert(i == 4 and p == 17)
local i, p = unpack("!4 i4", x, -7)
assert(i == 4 and p == 17)
local i, p = unpack("!4 i4", x, -#x)
assert(i == 1 and p == 5)
-- limits
for i = 1, #x + 1 do
assert(unpack("c0", x, i) == "")
end
checkerror("out of string", unpack, "c0", x, #x + 2)
end
print "OK"
UTF8¶
-- $Id: testes/utf8.lua $
-- See Copyright Notice in file all.lua
print "testing UTF-8 library"
local utf8 = require'utf8'
local function checkerror (msg, f, ...)
local s, err = pcall(f, ...)
assert(not s and string.find(err, msg))
end
local function len (s)
return #string.gsub(s, "[\x80-\xBF]", "")
end
local justone = "^" .. utf8.charpattern .. "$"
-- 't' is the list of codepoints of 's'
local function checksyntax (s, t)
-- creates a string "return '\u{t[1]}...\u{t[n]}'"
local ts = {"return '"}
for i = 1, #t do ts[i + 1] = string.format("\\u{%x}", t[i]) end
ts[#t + 2] = "'"
ts = table.concat(ts)
-- its execution should result in 's'
assert(assert(load(ts))() == s)
end
assert(not utf8.offset("alo", 5))
assert(not utf8.offset("alo", -4))
-- 'check' makes several tests over the validity of string 's'.
-- 't' is the list of codepoints of 's'.
local function check (s, t, nonstrict)
local l = utf8.len(s, 1, -1, nonstrict)
assert(#t == l and len(s) == l)
assert(utf8.char(table.unpack(t)) == s) -- 't' and 's' are equivalent
assert(utf8.offset(s, 0) == 1)
checksyntax(s, t)
-- creates new table with all codepoints of 's'
local t1 = {utf8.codepoint(s, 1, -1, nonstrict)}
assert(#t == #t1)
for i = 1, #t do assert(t[i] == t1[i]) end -- 't' is equal to 't1'
for i = 1, l do -- for all codepoints
local pi = utf8.offset(s, i) -- position of i-th char
local pi1 = utf8.offset(s, 2, pi) -- position of next char
assert(string.find(string.sub(s, pi, pi1 - 1), justone))
assert(utf8.offset(s, -1, pi1) == pi)
assert(utf8.offset(s, i - l - 1) == pi)
assert(pi1 - pi == #utf8.char(utf8.codepoint(s, pi, pi, nonstrict)))
for j = pi, pi1 - 1 do
assert(utf8.offset(s, 0, j) == pi)
end
for j = pi + 1, pi1 - 1 do
assert(not utf8.len(s, j))
end
assert(utf8.len(s, pi, pi, nonstrict) == 1)
assert(utf8.len(s, pi, pi1 - 1, nonstrict) == 1)
assert(utf8.len(s, pi, -1, nonstrict) == l - i + 1)
assert(utf8.len(s, pi1, -1, nonstrict) == l - i)
assert(utf8.len(s, 1, pi, nonstrict) == i)
end
local i = 0
for p, c in utf8.codes(s, nonstrict) do
i = i + 1
assert(c == t[i] and p == utf8.offset(s, i))
assert(utf8.codepoint(s, p, p, nonstrict) == c)
end
assert(i == #t)
i = 0
for c in string.gmatch(s, utf8.charpattern) do
i = i + 1
assert(c == utf8.char(t[i]))
end
assert(i == #t)
for i = 1, l do
assert(utf8.offset(s, i) == utf8.offset(s, i - l - 1, #s + 1))
end
end
do -- error indication in utf8.len
local function check (s, p)
local a, b = utf8.len(s)
assert(not a and b == p)
end
check("abc\xE3def", 4)
check("汉字\x80", #("汉字") + 1)
check("\xF4\x9F\xBF", 1)
check("\xF4\x9F\xBF\xBF", 1)
end
-- errors in utf8.codes
do
local function errorcodes (s)
checkerror("invalid UTF%-8 code",
function ()
for c in utf8.codes(s) do assert(c) end
end)
end
errorcodes("ab\xff")
errorcodes("\u{110000}")
end
-- error in initial position for offset
checkerror("position out of bounds", utf8.offset, "abc", 1, 5)
checkerror("position out of bounds", utf8.offset, "abc", 1, -4)
checkerror("position out of bounds", utf8.offset, "", 1, 2)
checkerror("position out of bounds", utf8.offset, "", 1, -1)
checkerror("continuation byte", utf8.offset, "𦧺", 1, 2)
checkerror("continuation byte", utf8.offset, "𦧺", 1, 2)
checkerror("continuation byte", utf8.offset, "\x80", 1)
-- error in indices for len
checkerror("out of bounds", utf8.len, "abc", 0, 2)
checkerror("out of bounds", utf8.len, "abc", 1, 4)
local s = "hello World"
local t = {string.byte(s, 1, -1)}
for i = 1, utf8.len(s) do assert(t[i] == string.byte(s, i)) end
check(s, t)
check("汉字/漢字", {27721, 23383, 47, 28450, 23383,})
do
local s = "áéí\128"
local t = {utf8.codepoint(s,1,#s - 1)}
assert(#t == 3 and t[1] == 225 and t[2] == 233 and t[3] == 237)
checkerror("invalid UTF%-8 code", utf8.codepoint, s, 1, #s)
checkerror("out of bounds", utf8.codepoint, s, #s + 1)
t = {utf8.codepoint(s, 4, 3)}
assert(#t == 0)
checkerror("out of bounds", utf8.codepoint, s, -(#s + 1), 1)
checkerror("out of bounds", utf8.codepoint, s, 1, #s + 1)
-- surrogates
assert(utf8.codepoint("\u{D7FF}") == 0xD800 - 1)
assert(utf8.codepoint("\u{E000}") == 0xDFFF + 1)
assert(utf8.codepoint("\u{D800}", 1, 1, true) == 0xD800)
assert(utf8.codepoint("\u{DFFF}", 1, 1, true) == 0xDFFF)
assert(utf8.codepoint("\u{7FFFFFFF}", 1, 1, true) == 0x7FFFFFFF)
end
assert(utf8.char() == "")
assert(utf8.char(0, 97, 98, 99, 1) == "\0abc\1")
assert(utf8.codepoint(utf8.char(0x10FFFF)) == 0x10FFFF)
assert(utf8.codepoint(utf8.char(0x7FFFFFFF), 1, 1, true) == (1<<31) - 1)
checkerror("value out of range", utf8.char, 0x7FFFFFFF + 1)
checkerror("value out of range", utf8.char, -1)
local function invalid (s)
checkerror("invalid UTF%-8 code", utf8.codepoint, s)
assert(not utf8.len(s))
end
-- UTF-8 representation for 0x11ffff (value out of valid range)
invalid("\xF4\x9F\xBF\xBF")
-- surrogates
invalid("\u{D800}")
invalid("\u{DFFF}")
-- overlong sequences
invalid("\xC0\x80") -- zero
invalid("\xC1\xBF") -- 0x7F (should be coded in 1 byte)
invalid("\xE0\x9F\xBF") -- 0x7FF (should be coded in 2 bytes)
invalid("\xF0\x8F\xBF\xBF") -- 0xFFFF (should be coded in 3 bytes)
-- invalid bytes
invalid("\x80") -- continuation byte
invalid("\xBF") -- continuation byte
invalid("\xFE") -- invalid byte
invalid("\xFF") -- invalid byte
-- empty string
check("", {})
-- minimum and maximum values for each sequence size
s = "\0 \x7F\z
\xC2\x80 \xDF\xBF\z
\xE0\xA0\x80 \xEF\xBF\xBF\z
\xF0\x90\x80\x80 \xF4\x8F\xBF\xBF"
s = string.gsub(s, " ", "")
check(s, {0,0x7F, 0x80,0x7FF, 0x800,0xFFFF, 0x10000,0x10FFFF})
do
-- original UTF-8 values
local s = "\u{4000000}\u{7FFFFFFF}"
assert(#s == 12)
check(s, {0x4000000, 0x7FFFFFFF}, true)
s = "\u{200000}\u{3FFFFFF}"
assert(#s == 10)
check(s, {0x200000, 0x3FFFFFF}, true)
s = "\u{10000}\u{1fffff}"
assert(#s == 8)
check(s, {0x10000, 0x1FFFFF}, true)
end
x = "日本語a-4\0éó"
check(x, {26085, 26412, 35486, 97, 45, 52, 0, 233, 243})
-- Supplementary Characters
check("𣲷𠜎𠱓𡁻𠵼ab𠺢",
{0x23CB7, 0x2070E, 0x20C53, 0x2107B, 0x20D7C, 0x61, 0x62, 0x20EA2,})
check("𨳊𩶘𦧺𨳒𥄫𤓓\xF4\x8F\xBF\xBF",
{0x28CCA, 0x29D98, 0x269FA, 0x28CD2, 0x2512B, 0x244D3, 0x10ffff})
local i = 0
for p, c in string.gmatch(x, "()(" .. utf8.charpattern .. ")") do
i = i + 1
assert(utf8.offset(x, i) == p)
assert(utf8.len(x, p) == utf8.len(x) - i + 1)
assert(utf8.len(c) == 1)
for j = 1, #c - 1 do
assert(utf8.offset(x, 0, p + j - 1) == p)
end
end
print'ok'
VARARG¶
-- $Id: testes/vararg.lua $
-- See Copyright Notice in file all.lua
print('testing vararg')
function f(a, ...)
local x = {n = select('#', ...), ...}
for i = 1, x.n do assert(a[i] == x[i]) end
return x.n
end
function c12 (...)
assert(arg == _G.arg) -- no local 'arg'
local x = {...}; x.n = #x
local res = (x.n==2 and x[1] == 1 and x[2] == 2)
if res then res = 55 end
return res, 2
end
function vararg (...) return {n = select('#', ...), ...} end
local call = function (f, args) return f(table.unpack(args, 1, args.n)) end
assert(f() == 0)
assert(f({1,2,3}, 1, 2, 3) == 3)
assert(f({"alo", nil, 45, f, nil}, "alo", nil, 45, f, nil) == 5)
assert(vararg().n == 0)
assert(vararg(nil, nil).n == 2)
assert(c12(1,2)==55)
a,b = assert(call(c12, {1,2}))
assert(a == 55 and b == 2)
a = call(c12, {1,2;n=2})
assert(a == 55 and b == 2)
a = call(c12, {1,2;n=1})
assert(not a)
assert(c12(1,2,3) == false)
local a = vararg(call(next, {_G,nil;n=2}))
local b,c = next(_G)
assert(a[1] == b and a[2] == c and a.n == 2)
a = vararg(call(call, {c12, {1,2}}))
assert(a.n == 2 and a[1] == 55 and a[2] == 2)
a = call(print, {'+'})
assert(a == nil)
local t = {1, 10}
function t:f (...) local arg = {...}; return self[...]+#arg end
assert(t:f(1,4) == 3 and t:f(2) == 11)
print('+')
lim = 20
local i, a = 1, {}
while i <= lim do a[i] = i+0.3; i=i+1 end
function f(a, b, c, d, ...)
local more = {...}
assert(a == 1.3 and more[1] == 5.3 and
more[lim-4] == lim+0.3 and not more[lim-3])
end
function g(a,b,c)
assert(a == 1.3 and b == 2.3 and c == 3.3)
end
call(f, a)
call(g, a)
a = {}
i = 1
while i <= lim do a[i] = i; i=i+1 end
assert(call(math.max, a) == lim)
print("+")
-- new-style varargs
function oneless (a, ...) return ... end
function f (n, a, ...)
local b
assert(arg == _G.arg) -- no local 'arg'
if n == 0 then
local b, c, d = ...
return a, b, c, d, oneless(oneless(oneless(...)))
else
n, b, a = n-1, ..., a
assert(b == ...)
return f(n, a, ...)
end
end
a,b,c,d,e = assert(f(10,5,4,3,2,1))
assert(a==5 and b==4 and c==3 and d==2 and e==1)
a,b,c,d,e = f(4)
assert(a==nil and b==nil and c==nil and d==nil and e==nil)
-- varargs for main chunks
f = load[[ return {...} ]]
x = f(2,3)
assert(x[1] == 2 and x[2] == 3 and x[3] == undef)
f = load[[
local x = {...}
for i=1,select('#', ...) do assert(x[i] == select(i, ...)) end
assert(x[select('#', ...)+1] == undef)
return true
]]
assert(f("a", "b", nil, {}, assert))
assert(f())
a = {select(3, table.unpack{10,20,30,40})}
assert(#a == 2 and a[1] == 30 and a[2] == 40)
a = {select(1)}
assert(next(a) == nil)
a = {select(-1, 3, 5, 7)}
assert(a[1] == 7 and a[2] == undef)
a = {select(-2, 3, 5, 7)}
assert(a[1] == 5 and a[2] == 7 and a[3] == undef)
pcall(select, 10000)
pcall(select, -10000)
-- bug in 5.2.2
function f(p1, p2, p3, p4, p5, p6, p7, p8, p9, p10,
p11, p12, p13, p14, p15, p16, p17, p18, p19, p20,
p21, p22, p23, p24, p25, p26, p27, p28, p29, p30,
p31, p32, p33, p34, p35, p36, p37, p38, p39, p40,
p41, p42, p43, p44, p45, p46, p48, p49, p50, ...)
local a1,a2,a3,a4,a5,a6,a7
local a8,a9,a10,a11,a12,a13,a14
end
-- assertion fail here
f()
-- missing arguments in tail call
do
local function f(a,b,c) return c, b end
local function g() return f(1,2) end
local a, b = g()
assert(a == nil and b == 2)
end
print('OK')
VERYBIG¶
-- $Id: testes/verybig.lua $
-- See Copyright Notice in file all.lua
print "testing RK"
-- testing opcodes with RK arguments larger than K limit
local function foo ()
local dummy = {
-- fill first 256 entries in table of constants
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32,
33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64,
65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80,
81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96,
97, 98, 99, 100, 101, 102, 103, 104,
105, 106, 107, 108, 109, 110, 111, 112,
113, 114, 115, 116, 117, 118, 119, 120,
121, 122, 123, 124, 125, 126, 127, 128,
129, 130, 131, 132, 133, 134, 135, 136,
137, 138, 139, 140, 141, 142, 143, 144,
145, 146, 147, 148, 149, 150, 151, 152,
153, 154, 155, 156, 157, 158, 159, 160,
161, 162, 163, 164, 165, 166, 167, 168,
169, 170, 171, 172, 173, 174, 175, 176,
177, 178, 179, 180, 181, 182, 183, 184,
185, 186, 187, 188, 189, 190, 191, 192,
193, 194, 195, 196, 197, 198, 199, 200,
201, 202, 203, 204, 205, 206, 207, 208,
209, 210, 211, 212, 213, 214, 215, 216,
217, 218, 219, 220, 221, 222, 223, 224,
225, 226, 227, 228, 229, 230, 231, 232,
233, 234, 235, 236, 237, 238, 239, 240,
241, 242, 243, 244, 245, 246, 247, 248,
249, 250, 251, 252, 253, 254, 255, 256,
}
assert(24.5 + 0.6 == 25.1)
local t = {foo = function (self, x) return x + self.x end, x = 10}
t.t = t
assert(t:foo(1.5) == 11.5)
assert(t.t:foo(0.5) == 10.5) -- bug in 5.2 alpha
assert(24.3 == 24.3)
assert((function () return t.x end)() == 10)
end
foo()
foo = nil
if _soft then return 10 end
print "testing large programs (>64k)"
-- template to create a very big test file
prog = [[$
local a,b
b = {$1$
b30009 = 65534,
b30010 = 65535,
b30011 = 65536,
b30012 = 65537,
b30013 = 16777214,
b30014 = 16777215,
b30015 = 16777216,
b30016 = 16777217,
b30017 = 0x7fffff,
b30018 = -0x7fffff,
b30019 = 0x1ffffff,
b30020 = -0x1ffffd,
b30021 = -65534,
b30022 = -65535,
b30023 = -65536,
b30024 = -0xffffff,
b30025 = 15012.5,
$2$
};
assert(b.a50008 == 25004 and b["a11"] == -5.5)
assert(b.a33007 == -16503.5 and b.a50009 == -25004.5)
assert(b["b"..30024] == -0xffffff)
function b:xxx (a,b) return a+b end
assert(b:xxx(10, 12) == 22) -- pushself with non-constant index
b["xxx"] = undef
s = 0; n=0
for a,b in pairs(b) do s=s+b; n=n+1 end
-- with 32-bit floats, exact value of 's' depends on summation order
assert(81800000.0 < s and s < 81860000 and n == 70001)
a = nil; b = nil
print'+'
function f(x) b=x end
a = f{$3$} or 10
assert(a==10)
assert(b[1] == "a10" and b[2] == 5 and b[#b-1] == "a50009")
function xxxx (x) return b[x] end
assert(xxxx(3) == "a11")
a = nil; b=nil
xxxx = nil
return 10
]]
-- functions to fill in the $n$
local function sig (x)
return (x % 2 == 0) and '' or '-'
end
F = {
function () -- $1$
for i=10,50009 do
io.write('a', i, ' = ', sig(i), 5+((i-10)/2), ',\n')
end
end,
function () -- $2$
for i=30026,50009 do
io.write('b', i, ' = ', sig(i), 15013+((i-30026)/2), ',\n')
end
end,
function () -- $3$
for i=10,50009 do
io.write('"a', i, '", ', sig(i), 5+((i-10)/2), ',\n')
end
end,
}
file = os.tmpname()
io.output(file)
for s in string.gmatch(prog, "$([^$]+)") do
local n = tonumber(s)
if not n then io.write(s) else F[n]() end
end
io.close()
result = dofile(file)
assert(os.remove(file))
print'OK'
return result
