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new fork of Lua 5.1 

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Lua License
-----------
Lua is licensed under the terms of the MIT license reproduced below.
This means that Lua is free software and can be used for both academic
and commercial purposes at absolutely no cost.
For details and rationale, see http://www.lua.org/license.html .
===============================================================================
Copyright (C) 1994-2012 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.
===============================================================================

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HISTORY for Lua 5.1
* Changes from version 5.0 to 5.1
-------------------------------
Language:
+ new module system.
+ new semantics for control variables of fors.
+ new semantics for setn/getn.
+ new syntax/semantics for varargs.
+ new long strings and comments.
+ new `mod' operator (`%')
+ new length operator #t
+ metatables for all types
API:
+ new functions: lua_createtable, lua_get(set)field, lua_push(to)integer.
+ user supplies memory allocator (lua_open becomes lua_newstate).
+ luaopen_* functions must be called through Lua.
Implementation:
+ new configuration scheme via luaconf.h.
+ incremental garbage collection.
+ better handling of end-of-line in the lexer.
+ fully reentrant parser (new Lua function `load')
+ better support for 64-bit machines.
+ native loadlib support for Mac OS X.
+ standard distribution in only one library (lualib.a merged into lua.a)
* Changes from version 4.0 to 5.0
-------------------------------
Language:
+ lexical scoping.
+ Lua coroutines.
+ standard libraries now packaged in tables.
+ tags replaced by metatables and tag methods replaced by metamethods,
stored in metatables.
+ proper tail calls.
+ each function can have its own global table, which can be shared.
+ new __newindex metamethod, called when we insert a new key into a table.
+ new block comments: --[[ ... ]].
+ new generic for.
+ new weak tables.
+ new boolean type.
+ new syntax "local function".
+ (f()) returns the first value returned by f.
+ {f()} fills a table with all values returned by f.
+ \n ignored in [[\n .
+ fixed and-or priorities.
+ more general syntax for function definition (e.g. function a.x.y:f()...end).
+ more general syntax for function calls (e.g. (print or write)(9)).
+ new functions (time/date, tmpfile, unpack, require, load*, etc.).
API:
+ chunks are loaded by using lua_load; new luaL_loadfile and luaL_loadbuffer.
+ introduced lightweight userdata, a simple "void*" without a metatable.
+ new error handling protocol: the core no longer prints error messages;
all errors are reported to the caller on the stack.
+ new lua_atpanic for host cleanup.
+ new, signal-safe, hook scheme.
Implementation:
+ new license: MIT.
+ new, faster, register-based virtual machine.
+ support for external multithreading and coroutines.
+ new and consistent error message format.
+ the core no longer needs "stdio.h" for anything (except for a single
use of sprintf to convert numbers to strings).
+ lua.c now runs the environment variable LUA_INIT, if present. It can
be "@filename", to run a file, or the chunk itself.
+ support for user extensions in lua.c.
sample implementation given for command line editing.
+ new dynamic loading library, active by default on several platforms.
+ safe garbage-collector metamethods.
+ precompiled bytecodes checked for integrity (secure binary dostring).
+ strings are fully aligned.
+ position capture in string.find.
+ read('*l') can read lines with embedded zeros.
* Changes from version 3.2 to 4.0
-------------------------------
Language:
+ new "break" and "for" statements (both numerical and for tables).
+ uniform treatment of globals: globals are now stored in a Lua table.
+ improved error messages.
+ no more '$debug': full speed *and* full debug information.
+ new read form: read(N) for next N bytes.
+ general read patterns now deprecated.
(still available with -DCOMPAT_READPATTERNS.)
+ all return values are passed as arguments for the last function
(old semantics still available with -DLUA_COMPAT_ARGRET)
+ garbage collection tag methods for tables now deprecated.
+ there is now only one tag method for order.
API:
+ New API: fully re-entrant, simpler, and more efficient.
+ New debug API.
Implementation:
+ faster than ever: cleaner virtual machine and new hashing algorithm.
+ non-recursive garbage-collector algorithm.
+ reduced memory usage for programs with many strings.
+ improved treatment for memory allocation errors.
+ improved support for 16-bit machines (we hope).
+ code now compiles unmodified as both ANSI C and C++.
+ numbers in bases other than 10 are converted using strtoul.
+ new -f option in Lua to support #! scripts.
+ luac can now combine text and binaries.
* Changes from version 3.1 to 3.2
-------------------------------
+ redirected all output in Lua's core to _ERRORMESSAGE and _ALERT.
+ increased limit on the number of constants and globals per function
(from 2^16 to 2^24).
+ debugging info (lua_debug and hooks) moved into lua_state and new API
functions provided to get and set this info.
+ new debug lib gives full debugging access within Lua.
+ new table functions "foreachi", "sort", "tinsert", "tremove", "getn".
+ new io functions "flush", "seek".
* Changes from version 3.0 to 3.1
-------------------------------
+ NEW FEATURE: anonymous functions with closures (via "upvalues").
+ new syntax:
- local variables in chunks.
- better scope control with DO block END.
- constructors can now be also written: { record-part; list-part }.
- more general syntax for function calls and lvalues, e.g.:
f(x).y=1
o:f(x,y):g(z)
f"string" is sugar for f("string")
+ strings may now contain arbitrary binary data (e.g., embedded zeros).
+ major code re-organization and clean-up; reduced module interdependecies.
+ no arbitrary limits on the total number of constants and globals.
+ support for multiple global contexts.
+ better syntax error messages.
+ new traversal functions "foreach" and "foreachvar".
+ the default for numbers is now double.
changing it to use floats or longs is easy.
+ complete debug information stored in pre-compiled chunks.
+ sample interpreter now prompts user when run interactively, and also
handles control-C interruptions gracefully.
* Changes from version 2.5 to 3.0
-------------------------------
+ NEW CONCEPT: "tag methods".
Tag methods replace fallbacks as the meta-mechanism for extending the
semantics of Lua. Whereas fallbacks had a global nature, tag methods
work on objects having the same tag (e.g., groups of tables).
Existing code that uses fallbacks should work without change.
+ new, general syntax for constructors {[exp] = exp, ... }.
+ support for handling variable number of arguments in functions (varargs).
+ support for conditional compilation ($if ... $else ... $end).
+ cleaner semantics in API simplifies host code.
+ better support for writing libraries (auxlib.h).
+ better type checking and error messages in the standard library.
+ luac can now also undump.
* Changes from version 2.4 to 2.5
-------------------------------
+ io and string libraries are now based on pattern matching;
the old libraries are still available for compatibility
+ dofile and dostring can now return values (via return statement)
+ better support for 16- and 64-bit machines
+ expanded documentation, with more examples
* Changes from version 2.2 to 2.4
-------------------------------
+ external compiler creates portable binary files that can be loaded faster
+ interface for debugging and profiling
+ new "getglobal" fallback
+ new functions for handling references to Lua objects
+ new functions in standard lib
+ only one copy of each string is stored
+ expanded documentation, with more examples
* Changes from version 2.1 to 2.2
-------------------------------
+ functions now may be declared with any "lvalue" as a name
+ garbage collection of functions
+ support for pipes
* Changes from version 1.1 to 2.1
-------------------------------
+ object-oriented support
+ fallbacks
+ simplified syntax for tables
+ many internal improvements
(end of HISTORY)

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INSTALL for Lua 5.1
* Building Lua
------------
Lua is built in the src directory, but the build process can be
controlled from the top-level Makefile.
Building Lua on Unix systems should be very easy. First do "make" and
see if your platform is listed. If so, just do "make xxx", where xxx
is your platform name. The platforms currently supported are:
aix ansi bsd freebsd generic linux macosx mingw posix solaris
If your platform is not listed, try the closest one or posix, generic,
ansi, in this order.
See below for customization instructions and for instructions on how
to build with other Windows compilers.
If you want to check that Lua has been built correctly, do "make test"
after building Lua. Also, have a look at the example programs in test.
* Installing Lua
--------------
Once you have built Lua, you may want to install it in an official
place in your system. In this case, do "make install". The official
place and the way to install files are defined in Makefile. You must
have the right permissions to install files.
If you want to build and install Lua in one step, do "make xxx install",
where xxx is your platform name.
If you want to install Lua locally, then do "make local". This will
create directories bin, include, lib, man, and install Lua there as
follows:
bin: lua luac
include: lua.h luaconf.h lualib.h lauxlib.h lua.hpp
lib: liblua.a
man/man1: lua.1 luac.1
These are the only directories you need for development.
There are man pages for lua and luac, in both nroff and html, and a
reference manual in html in doc, some sample code in test, and some
useful stuff in etc. You don't need these directories for development.
If you want to install Lua locally, but in some other directory, do
"make install INSTALL_TOP=xxx", where xxx is your chosen directory.
See below for instructions for Windows and other systems.
* Customization
-------------
Three things can be customized by editing a file:
- Where and how to install Lua -- edit Makefile.
- How to build Lua -- edit src/Makefile.
- Lua features -- edit src/luaconf.h.
You don't actually need to edit the Makefiles because you may set the
relevant variables when invoking make.
On the other hand, if you need to select some Lua features, you'll need
to edit src/luaconf.h. The edited file will be the one installed, and
it will be used by any Lua clients that you build, to ensure consistency.
We strongly recommend that you enable dynamic loading. This is done
automatically for all platforms listed above that have this feature
(and also Windows). See src/luaconf.h and also src/Makefile.
* Building Lua on Windows and other systems
-----------------------------------------
If you're not using the usual Unix tools, then the instructions for
building Lua depend on the compiler you use. You'll need to create
projects (or whatever your compiler uses) for building the library,
the interpreter, and the compiler, as follows:
library: lapi.c lcode.c ldebug.c ldo.c ldump.c lfunc.c lgc.c llex.c
lmem.c lobject.c lopcodes.c lparser.c lstate.c lstring.c
ltable.c ltm.c lundump.c lvm.c lzio.c
lauxlib.c lbaselib.c ldblib.c liolib.c lmathlib.c loslib.c
ltablib.c lstrlib.c loadlib.c linit.c
interpreter: library, lua.c
compiler: library, luac.c print.c
If you use Visual Studio .NET, you can use etc/luavs.bat in its
"Command Prompt".
If all you want is to build the Lua interpreter, you may put all .c files
in a single project, except for luac.c and print.c. Or just use etc/all.c.
To use Lua as a library in your own programs, you'll need to know how to
create and use libraries with your compiler.
As mentioned above, you may edit luaconf.h to select some features before
building Lua.
(end of INSTALL)

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# makefile for installing Lua
# see INSTALL for installation instructions
# see src/Makefile and src/luaconf.h for further customization
# == CHANGE THE SETTINGS BELOW TO SUIT YOUR ENVIRONMENT =======================
# Your platform. See PLATS for possible values.
PLAT= none
# Where to install. The installation starts in the src and doc directories,
# so take care if INSTALL_TOP is not an absolute path.
INSTALL_TOP= /usr/local
INSTALL_BIN= $(INSTALL_TOP)/bin
INSTALL_INC= $(INSTALL_TOP)/include
INSTALL_LIB= $(INSTALL_TOP)/lib
INSTALL_MAN= $(INSTALL_TOP)/man/man1
#
# You probably want to make INSTALL_LMOD and INSTALL_CMOD consistent with
# LUA_ROOT, LUA_LDIR, and LUA_CDIR in luaconf.h (and also with etc/lua.pc).
INSTALL_LMOD= $(INSTALL_TOP)/share/lua/$V
INSTALL_CMOD= $(INSTALL_TOP)/lib/lua/$V
# How to install. If your install program does not support "-p", then you
# may have to run ranlib on the installed liblua.a (do "make ranlib").
INSTALL= install -p
INSTALL_EXEC= $(INSTALL) -m 0755
INSTALL_DATA= $(INSTALL) -m 0644
#
# If you don't have install you can use cp instead.
# INSTALL= cp -p
# INSTALL_EXEC= $(INSTALL)
# INSTALL_DATA= $(INSTALL)
# Utilities.
MKDIR= mkdir -p
RANLIB= ranlib
# == END OF USER SETTINGS. NO NEED TO CHANGE ANYTHING BELOW THIS LINE =========
# Convenience platforms targets.
PLATS= aix ansi bsd freebsd generic linux macosx mingw posix solaris
# What to install.
TO_BIN= lua luac
TO_INC= lua.h luaconf.h lualib.h lauxlib.h ../etc/lua.hpp
TO_LIB= liblua.a
TO_MAN= lua.1 luac.1
# Lua version and release.
V= 5.1
R= 5.1.5
all: $(PLAT)
$(PLATS) clean:
cd src && $(MAKE) $@
test: dummy
src/lua test/hello.lua
install: dummy
cd src && $(MKDIR) $(INSTALL_BIN) $(INSTALL_INC) $(INSTALL_LIB) $(INSTALL_MAN) $(INSTALL_LMOD) $(INSTALL_CMOD)
cd src && $(INSTALL_EXEC) $(TO_BIN) $(INSTALL_BIN)
cd src && $(INSTALL_DATA) $(TO_INC) $(INSTALL_INC)
cd src && $(INSTALL_DATA) $(TO_LIB) $(INSTALL_LIB)
cd doc && $(INSTALL_DATA) $(TO_MAN) $(INSTALL_MAN)
ranlib:
cd src && cd $(INSTALL_LIB) && $(RANLIB) $(TO_LIB)
local:
$(MAKE) install INSTALL_TOP=..
none:
@echo "Please do"
@echo " make PLATFORM"
@echo "where PLATFORM is one of these:"
@echo " $(PLATS)"
@echo "See INSTALL for complete instructions."
# make may get confused with test/ and INSTALL in a case-insensitive OS
dummy:
# echo config parameters
echo:
@echo ""
@echo "These are the parameters currently set in src/Makefile to build Lua $R:"
@echo ""
@cd src && $(MAKE) -s echo
@echo ""
@echo "These are the parameters currently set in Makefile to install Lua $R:"
@echo ""
@echo "PLAT = $(PLAT)"
@echo "INSTALL_TOP = $(INSTALL_TOP)"
@echo "INSTALL_BIN = $(INSTALL_BIN)"
@echo "INSTALL_INC = $(INSTALL_INC)"
@echo "INSTALL_LIB = $(INSTALL_LIB)"
@echo "INSTALL_MAN = $(INSTALL_MAN)"
@echo "INSTALL_LMOD = $(INSTALL_LMOD)"
@echo "INSTALL_CMOD = $(INSTALL_CMOD)"
@echo "INSTALL_EXEC = $(INSTALL_EXEC)"
@echo "INSTALL_DATA = $(INSTALL_DATA)"
@echo ""
@echo "See also src/luaconf.h ."
@echo ""
# echo private config parameters
pecho:
@echo "V = $(V)"
@echo "R = $(R)"
@echo "TO_BIN = $(TO_BIN)"
@echo "TO_INC = $(TO_INC)"
@echo "TO_LIB = $(TO_LIB)"
@echo "TO_MAN = $(TO_MAN)"
# echo config parameters as Lua code
# uncomment the last sed expression if you want nil instead of empty strings
lecho:
@echo "-- installation parameters for Lua $R"
@echo "VERSION = '$V'"
@echo "RELEASE = '$R'"
@$(MAKE) echo | grep = | sed -e 's/= /= "/' -e 's/$$/"/' #-e 's/""/nil/'
@echo "-- EOF"
# list targets that do not create files (but not all makes understand .PHONY)
.PHONY: all $(PLATS) clean test install local none dummy echo pecho lecho
# (end of Makefile)

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# Cataract - an environment for end-user programming in Lua 5.1
"Enable all people to modify the software they use in the course of using it."
-- https://futureofcoding.org/episodes/033.html
"What if we, and all computer users, could reach in and modify our favorite apps?"
-- https://www.inkandswitch.com/end-user-programming
"Software must be as easy to change as it is to use it"
-- https://malleable.systems
# README for Lua 5.1
* What is Lua?
------------
Lua is a powerful, light-weight programming language designed for extending
applications. Lua is also frequently used as a general-purpose, stand-alone
language. Lua is free software.
For complete information, visit Lua's web site at http://www.lua.org/ .
For an executive summary, see http://www.lua.org/about.html .
Lua has been used in many different projects around the world.
For a short list, see http://www.lua.org/uses.html .
* Availability
------------
Lua is freely available for both academic and commercial purposes.
See COPYRIGHT and http://www.lua.org/license.html for details.
Lua can be downloaded at http://www.lua.org/download.html .
* Installation
------------
Lua is implemented in pure ANSI C, and compiles unmodified in all known
platforms that have an ANSI C compiler. In most Unix-like platforms, simply
do "make" with a suitable target. See INSTALL for detailed instructions.
* Origin
------
Lua is developed at Lua.org, a laboratory of the Department of Computer
Science of PUC-Rio (the Pontifical Catholic University of Rio de Janeiro
in Brazil).
For more information about the authors, see http://www.lua.org/authors.html .

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<HTML>
<HEAD>
<TITLE>Lua 5.1 Reference Manual - contents</TITLE>
<LINK REL="stylesheet" TYPE="text/css" HREF="lua.css">
<META HTTP-EQUIV="content-type" CONTENT="text/html; charset=utf-8">
<STYLE TYPE="text/css">
ul {
list-style-type: none ;
}
</STYLE>
</HEAD>
<BODY>
<HR>
<H1>
<A HREF="http://www.lua.org/"><IMG SRC="logo.gif" ALT="" BORDER=0></A>
Lua 5.1 Reference Manual
</H1>
<P>
The reference manual is the official definition of the Lua language.
For a complete introduction to Lua programming, see the book
<A HREF="http://www.lua.org/docs.html#pil">Programming in Lua</A>.
<P>
This manual is also available as a book:
<BLOCKQUOTE>
<A HREF="http://www.amazon.com/exec/obidos/ASIN/8590379833/lua-indexmanual-20">
<IMG SRC="cover.png" ALT="" TITLE="buy from Amazon" BORDER=1 ALIGN="left" HSPACE=12>
</A>
<B>Lua 5.1 Reference Manual</B>
<BR>by R. Ierusalimschy, L. H. de Figueiredo, W. Celes
<BR>Lua.org, August 2006
<BR>ISBN 85-903798-3-3
<BR CLEAR="all">
</BLOCKQUOTE>
<P>
<A HREF="http://www.amazon.com/exec/obidos/ASIN/8590379833/lua-indexmanual-20">Buy a copy</A>
of this book and
<A HREF="http://www.lua.org/donations.html">help to support</A>
the Lua project.
<P>
<A HREF="manual.html">start</A>
&middot;
<A HREF="#contents">contents</A>
&middot;
<A HREF="#index">index</A>
&middot;
<A HREF="http://www.lua.org/manual/">other versions</A>
<HR>
<SMALL>
Copyright &copy; 2006&ndash;2012 Lua.org, PUC-Rio.
Freely available under the terms of the
<A HREF="http://www.lua.org/license.html">Lua license</A>.
</SMALL>
<H2><A NAME="contents">Contents</A></H2>
<UL style="padding: 0">
<LI><A HREF="manual.html">1 &ndash; Introduction</A>
<P>
<LI><A HREF="manual.html#2">2 &ndash; The Language</A>
<UL>
<LI><A HREF="manual.html#2.1">2.1 &ndash; Lexical Conventions</A>
<LI><A HREF="manual.html#2.2">2.2 &ndash; Values and Types</A>
<UL>
<LI><A HREF="manual.html#2.2.1">2.2.1 &ndash; Coercion</A>
</UL>
<LI><A HREF="manual.html#2.3">2.3 &ndash; Variables</A>
<LI><A HREF="manual.html#2.4">2.4 &ndash; Statements</A>
<UL>
<LI><A HREF="manual.html#2.4.1">2.4.1 &ndash; Chunks</A>
<LI><A HREF="manual.html#2.4.2">2.4.2 &ndash; Blocks</A>
<LI><A HREF="manual.html#2.4.3">2.4.3 &ndash; Assignment</A>
<LI><A HREF="manual.html#2.4.4">2.4.4 &ndash; Control Structures</A>
<LI><A HREF="manual.html#2.4.5">2.4.5 &ndash; For Statement</A>
<LI><A HREF="manual.html#2.4.6">2.4.6 &ndash; Function Calls as Statements</A>
<LI><A HREF="manual.html#2.4.7">2.4.7 &ndash; Local Declarations</A>
</UL>
<LI><A HREF="manual.html#2.5">2.5 &ndash; Expressions</A>
<UL>
<LI><A HREF="manual.html#2.5.1">2.5.1 &ndash; Arithmetic Operators</A>
<LI><A HREF="manual.html#2.5.2">2.5.2 &ndash; Relational Operators</A>
<LI><A HREF="manual.html#2.5.3">2.5.3 &ndash; Logical Operators</A>
<LI><A HREF="manual.html#2.5.4">2.5.4 &ndash; Concatenation</A>
<LI><A HREF="manual.html#2.5.5">2.5.5 &ndash; The Length Operator</A>
<LI><A HREF="manual.html#2.5.6">2.5.6 &ndash; Precedence</A>
<LI><A HREF="manual.html#2.5.7">2.5.7 &ndash; Table Constructors</A>
<LI><A HREF="manual.html#2.5.8">2.5.8 &ndash; Function Calls</A>
<LI><A HREF="manual.html#2.5.9">2.5.9 &ndash; Function Definitions</A>
</UL>
<LI><A HREF="manual.html#2.6">2.6 &ndash; Visibility Rules</A>
<LI><A HREF="manual.html#2.7">2.7 &ndash; Error Handling</A>
<LI><A HREF="manual.html#2.8">2.8 &ndash; Metatables</A>
<LI><A HREF="manual.html#2.9">2.9 &ndash; Environments</A>
<LI><A HREF="manual.html#2.10">2.10 &ndash; Garbage Collection</A>
<UL>
<LI><A HREF="manual.html#2.10.1">2.10.1 &ndash; Garbage-Collection Metamethods</A>
<LI><A HREF="manual.html#2.10.2">2.10.2 &ndash; Weak Tables</A>
</UL>
<LI><A HREF="manual.html#2.11">2.11 &ndash; Coroutines</A>
</UL>
<P>
<LI><A HREF="manual.html#3">3 &ndash; The Application Program Interface</A>
<UL>
<LI><A HREF="manual.html#3.1">3.1 &ndash; The Stack</A>
<LI><A HREF="manual.html#3.2">3.2 &ndash; Stack Size</A>
<LI><A HREF="manual.html#3.3">3.3 &ndash; Pseudo-Indices</A>
<LI><A HREF="manual.html#3.4">3.4 &ndash; C Closures</A>
<LI><A HREF="manual.html#3.5">3.5 &ndash; Registry</A>
<LI><A HREF="manual.html#3.6">3.6 &ndash; Error Handling in C</A>
<LI><A HREF="manual.html#3.7">3.7 &ndash; Functions and Types</A>
<LI><A HREF="manual.html#3.8">3.8 &ndash; The Debug Interface</A>
</UL>
<P>
<LI><A HREF="manual.html#4">4 &ndash; The Auxiliary Library</A>
<UL>
<LI><A HREF="manual.html#4.1">4.1 &ndash; Functions and Types</A>
</UL>
<P>
<LI><A HREF="manual.html#5">5 &ndash; Standard Libraries</A>
<UL>
<LI><A HREF="manual.html#5.1">5.1 &ndash; Basic Functions</A>
<LI><A HREF="manual.html#5.2">5.2 &ndash; Coroutine Manipulation</A>
<LI><A HREF="manual.html#5.3">5.3 &ndash; Modules</A>
<LI><A HREF="manual.html#5.4">5.4 &ndash; String Manipulation</A>
<UL>
<LI><A HREF="manual.html#5.4.1">5.4.1 &ndash; Patterns</A>
</UL>
<LI><A HREF="manual.html#5.5">5.5 &ndash; Table Manipulation</A>
<LI><A HREF="manual.html#5.6">5.6 &ndash; Mathematical Functions</A>
<LI><A HREF="manual.html#5.7">5.7 &ndash; Input and Output Facilities</A>
<LI><A HREF="manual.html#5.8">5.8 &ndash; Operating System Facilities</A>
<LI><A HREF="manual.html#5.9">5.9 &ndash; The Debug Library</A>
</UL>
<P>
<LI><A HREF="manual.html#6">6 &ndash; Lua Stand-alone</A>
<P>
<LI><A HREF="manual.html#7">7 &ndash; Incompatibilities with the Previous Version</A>
<UL>
<LI><A HREF="manual.html#7.1">7.1 &ndash; Changes in the Language</A>
<LI><A HREF="manual.html#7.2">7.2 &ndash; Changes in the Libraries</A>
<LI><A HREF="manual.html#7.3">7.3 &ndash; Changes in the API</A>
</UL>
<P>
<LI><A HREF="manual.html#8">8 &ndash; The Complete Syntax of Lua</A>
</UL>
<H2><A NAME="index">Index</A></H2>
<TABLE WIDTH="100%">
<TR VALIGN="top">
<TD>
<H3><A NAME="functions">Lua functions</A></H3>
<A HREF="manual.html#pdf-_G">_G</A><BR>
<A HREF="manual.html#pdf-_VERSION">_VERSION</A><BR>
<P>
<A HREF="manual.html#pdf-assert">assert</A><BR>
<A HREF="manual.html#pdf-collectgarbage">collectgarbage</A><BR>
<A HREF="manual.html#pdf-dofile">dofile</A><BR>
<A HREF="manual.html#pdf-error">error</A><BR>
<A HREF="manual.html#pdf-getfenv">getfenv</A><BR>
<A HREF="manual.html#pdf-getmetatable">getmetatable</A><BR>
<A HREF="manual.html#pdf-ipairs">ipairs</A><BR>
<A HREF="manual.html#pdf-load">load</A><BR>
<A HREF="manual.html#pdf-loadfile">loadfile</A><BR>
<A HREF="manual.html#pdf-loadstring">loadstring</A><BR>
<A HREF="manual.html#pdf-module">module</A><BR>
<A HREF="manual.html#pdf-next">next</A><BR>
<A HREF="manual.html#pdf-pairs">pairs</A><BR>
<A HREF="manual.html#pdf-pcall">pcall</A><BR>
<A HREF="manual.html#pdf-print">print</A><BR>
<A HREF="manual.html#pdf-rawequal">rawequal</A><BR>
<A HREF="manual.html#pdf-rawget">rawget</A><BR>
<A HREF="manual.html#pdf-rawset">rawset</A><BR>
<A HREF="manual.html#pdf-require">require</A><BR>
<A HREF="manual.html#pdf-select">select</A><BR>
<A HREF="manual.html#pdf-setfenv">setfenv</A><BR>
<A HREF="manual.html#pdf-setmetatable">setmetatable</A><BR>
<A HREF="manual.html#pdf-tonumber">tonumber</A><BR>
<A HREF="manual.html#pdf-tostring">tostring</A><BR>
<A HREF="manual.html#pdf-type">type</A><BR>
<A HREF="manual.html#pdf-unpack">unpack</A><BR>
<A HREF="manual.html#pdf-xpcall">xpcall</A><BR>
<P>
<A HREF="manual.html#pdf-coroutine.create">coroutine.create</A><BR>
<A HREF="manual.html#pdf-coroutine.resume">coroutine.resume</A><BR>
<A HREF="manual.html#pdf-coroutine.running">coroutine.running</A><BR>
<A HREF="manual.html#pdf-coroutine.status">coroutine.status</A><BR>
<A HREF="manual.html#pdf-coroutine.wrap">coroutine.wrap</A><BR>
<A HREF="manual.html#pdf-coroutine.yield">coroutine.yield</A><BR>
<P>
<A HREF="manual.html#pdf-debug.debug">debug.debug</A><BR>
<A HREF="manual.html#pdf-debug.getfenv">debug.getfenv</A><BR>
<A HREF="manual.html#pdf-debug.gethook">debug.gethook</A><BR>
<A HREF="manual.html#pdf-debug.getinfo">debug.getinfo</A><BR>
<A HREF="manual.html#pdf-debug.getlocal">debug.getlocal</A><BR>
<A HREF="manual.html#pdf-debug.getmetatable">debug.getmetatable</A><BR>
<A HREF="manual.html#pdf-debug.getregistry">debug.getregistry</A><BR>
<A HREF="manual.html#pdf-debug.getupvalue">debug.getupvalue</A><BR>
<A HREF="manual.html#pdf-debug.setfenv">debug.setfenv</A><BR>
<A HREF="manual.html#pdf-debug.sethook">debug.sethook</A><BR>
<A HREF="manual.html#pdf-debug.setlocal">debug.setlocal</A><BR>
<A HREF="manual.html#pdf-debug.setmetatable">debug.setmetatable</A><BR>
<A HREF="manual.html#pdf-debug.setupvalue">debug.setupvalue</A><BR>
<A HREF="manual.html#pdf-debug.traceback">debug.traceback</A><BR>
</TD>
<TD>
<H3>&nbsp;</H3>
<A HREF="manual.html#pdf-file:close">file:close</A><BR>
<A HREF="manual.html#pdf-file:flush">file:flush</A><BR>
<A HREF="manual.html#pdf-file:lines">file:lines</A><BR>
<A HREF="manual.html#pdf-file:read">file:read</A><BR>
<A HREF="manual.html#pdf-file:seek">file:seek</A><BR>
<A HREF="manual.html#pdf-file:setvbuf">file:setvbuf</A><BR>
<A HREF="manual.html#pdf-file:write">file:write</A><BR>
<P>
<A HREF="manual.html#pdf-io.close">io.close</A><BR>
<A HREF="manual.html#pdf-io.flush">io.flush</A><BR>
<A HREF="manual.html#pdf-io.input">io.input</A><BR>
<A HREF="manual.html#pdf-io.lines">io.lines</A><BR>
<A HREF="manual.html#pdf-io.open">io.open</A><BR>
<A HREF="manual.html#pdf-io.output">io.output</A><BR>
<A HREF="manual.html#pdf-io.popen">io.popen</A><BR>
<A HREF="manual.html#pdf-io.read">io.read</A><BR>
<A HREF="manual.html#pdf-io.stderr">io.stderr</A><BR>
<A HREF="manual.html#pdf-io.stdin">io.stdin</A><BR>
<A HREF="manual.html#pdf-io.stdout">io.stdout</A><BR>
<A HREF="manual.html#pdf-io.tmpfile">io.tmpfile</A><BR>
<A HREF="manual.html#pdf-io.type">io.type</A><BR>
<A HREF="manual.html#pdf-io.write">io.write</A><BR>
<P>
<A HREF="manual.html#pdf-math.abs">math.abs</A><BR>
<A HREF="manual.html#pdf-math.acos">math.acos</A><BR>
<A HREF="manual.html#pdf-math.asin">math.asin</A><BR>
<A HREF="manual.html#pdf-math.atan">math.atan</A><BR>
<A HREF="manual.html#pdf-math.atan2">math.atan2</A><BR>
<A HREF="manual.html#pdf-math.ceil">math.ceil</A><BR>
<A HREF="manual.html#pdf-math.cos">math.cos</A><BR>
<A HREF="manual.html#pdf-math.cosh">math.cosh</A><BR>
<A HREF="manual.html#pdf-math.deg">math.deg</A><BR>
<A HREF="manual.html#pdf-math.exp">math.exp</A><BR>
<A HREF="manual.html#pdf-math.floor">math.floor</A><BR>
<A HREF="manual.html#pdf-math.fmod">math.fmod</A><BR>
<A HREF="manual.html#pdf-math.frexp">math.frexp</A><BR>
<A HREF="manual.html#pdf-math.huge">math.huge</A><BR>
<A HREF="manual.html#pdf-math.ldexp">math.ldexp</A><BR>
<A HREF="manual.html#pdf-math.log">math.log</A><BR>
<A HREF="manual.html#pdf-math.log10">math.log10</A><BR>
<A HREF="manual.html#pdf-math.max">math.max</A><BR>
<A HREF="manual.html#pdf-math.min">math.min</A><BR>
<A HREF="manual.html#pdf-math.modf">math.modf</A><BR>
<A HREF="manual.html#pdf-math.pi">math.pi</A><BR>
<A HREF="manual.html#pdf-math.pow">math.pow</A><BR>
<A HREF="manual.html#pdf-math.rad">math.rad</A><BR>
<A HREF="manual.html#pdf-math.random">math.random</A><BR>
<A HREF="manual.html#pdf-math.randomseed">math.randomseed</A><BR>
<A HREF="manual.html#pdf-math.sin">math.sin</A><BR>
<A HREF="manual.html#pdf-math.sinh">math.sinh</A><BR>
<A HREF="manual.html#pdf-math.sqrt">math.sqrt</A><BR>
<A HREF="manual.html#pdf-math.tan">math.tan</A><BR>
<A HREF="manual.html#pdf-math.tanh">math.tanh</A><BR>
<P>
<A HREF="manual.html#pdf-os.clock">os.clock</A><BR>
<A HREF="manual.html#pdf-os.date">os.date</A><BR>
<A HREF="manual.html#pdf-os.difftime">os.difftime</A><BR>
<A HREF="manual.html#pdf-os.execute">os.execute</A><BR>
<A HREF="manual.html#pdf-os.exit">os.exit</A><BR>
<A HREF="manual.html#pdf-os.getenv">os.getenv</A><BR>
<A HREF="manual.html#pdf-os.remove">os.remove</A><BR>
<A HREF="manual.html#pdf-os.rename">os.rename</A><BR>
<A HREF="manual.html#pdf-os.setlocale">os.setlocale</A><BR>
<A HREF="manual.html#pdf-os.time">os.time</A><BR>
<A HREF="manual.html#pdf-os.tmpname">os.tmpname</A><BR>
<P>
<A HREF="manual.html#pdf-package.cpath">package.cpath</A><BR>
<A HREF="manual.html#pdf-package.loaded">package.loaded</A><BR>
<A HREF="manual.html#pdf-package.loaders">package.loaders</A><BR>
<A HREF="manual.html#pdf-package.loadlib">package.loadlib</A><BR>
<A HREF="manual.html#pdf-package.path">package.path</A><BR>
<A HREF="manual.html#pdf-package.preload">package.preload</A><BR>
<A HREF="manual.html#pdf-package.seeall">package.seeall</A><BR>
<P>
<A HREF="manual.html#pdf-string.byte">string.byte</A><BR>
<A HREF="manual.html#pdf-string.char">string.char</A><BR>
<A HREF="manual.html#pdf-string.dump">string.dump</A><BR>
<A HREF="manual.html#pdf-string.find">string.find</A><BR>
<A HREF="manual.html#pdf-string.format">string.format</A><BR>
<A HREF="manual.html#pdf-string.gmatch">string.gmatch</A><BR>
<A HREF="manual.html#pdf-string.gsub">string.gsub</A><BR>
<A HREF="manual.html#pdf-string.len">string.len</A><BR>
<A HREF="manual.html#pdf-string.lower">string.lower</A><BR>
<A HREF="manual.html#pdf-string.match">string.match</A><BR>
<A HREF="manual.html#pdf-string.rep">string.rep</A><BR>
<A HREF="manual.html#pdf-string.reverse">string.reverse</A><BR>
<A HREF="manual.html#pdf-string.sub">string.sub</A><BR>
<A HREF="manual.html#pdf-string.upper">string.upper</A><BR>
<P>
<A HREF="manual.html#pdf-table.concat">table.concat</A><BR>
<A HREF="manual.html#pdf-table.insert">table.insert</A><BR>
<A HREF="manual.html#pdf-table.maxn">table.maxn</A><BR>
<A HREF="manual.html#pdf-table.remove">table.remove</A><BR>
<A HREF="manual.html#pdf-table.sort">table.sort</A><BR>
</TD>
<TD>
<H3>C API</H3>
<A HREF="manual.html#lua_Alloc">lua_Alloc</A><BR>
<A HREF="manual.html#lua_CFunction">lua_CFunction</A><BR>
<A HREF="manual.html#lua_Debug">lua_Debug</A><BR>
<A HREF="manual.html#lua_Hook">lua_Hook</A><BR>
<A HREF="manual.html#lua_Integer">lua_Integer</A><BR>
<A HREF="manual.html#lua_Number">lua_Number</A><BR>
<A HREF="manual.html#lua_Reader">lua_Reader</A><BR>
<A HREF="manual.html#lua_State">lua_State</A><BR>
<A HREF="manual.html#lua_Writer">lua_Writer</A><BR>
<P>
<A HREF="manual.html#lua_atpanic">lua_atpanic</A><BR>
<A HREF="manual.html#lua_call">lua_call</A><BR>
<A HREF="manual.html#lua_checkstack">lua_checkstack</A><BR>
<A HREF="manual.html#lua_close">lua_close</A><BR>
<A HREF="manual.html#lua_concat">lua_concat</A><BR>
<A HREF="manual.html#lua_cpcall">lua_cpcall</A><BR>
<A HREF="manual.html#lua_createtable">lua_createtable</A><BR>
<A HREF="manual.html#lua_dump">lua_dump</A><BR>
<A HREF="manual.html#lua_equal">lua_equal</A><BR>
<A HREF="manual.html#lua_error">lua_error</A><BR>
<A HREF="manual.html#lua_gc">lua_gc</A><BR>
<A HREF="manual.html#lua_getallocf">lua_getallocf</A><BR>
<A HREF="manual.html#lua_getfenv">lua_getfenv</A><BR>
<A HREF="manual.html#lua_getfield">lua_getfield</A><BR>
<A HREF="manual.html#lua_getglobal">lua_getglobal</A><BR>
<A HREF="manual.html#lua_gethook">lua_gethook</A><BR>
<A HREF="manual.html#lua_gethookcount">lua_gethookcount</A><BR>
<A HREF="manual.html#lua_gethookmask">lua_gethookmask</A><BR>
<A HREF="manual.html#lua_getinfo">lua_getinfo</A><BR>
<A HREF="manual.html#lua_getlocal">lua_getlocal</A><BR>
<A HREF="manual.html#lua_getmetatable">lua_getmetatable</A><BR>
<A HREF="manual.html#lua_getstack">lua_getstack</A><BR>
<A HREF="manual.html#lua_gettable">lua_gettable</A><BR>
<A HREF="manual.html#lua_gettop">lua_gettop</A><BR>
<A HREF="manual.html#lua_getupvalue">lua_getupvalue</A><BR>
<A HREF="manual.html#lua_insert">lua_insert</A><BR>
<A HREF="manual.html#lua_isboolean">lua_isboolean</A><BR>
<A HREF="manual.html#lua_iscfunction">lua_iscfunction</A><BR>
<A HREF="manual.html#lua_isfunction">lua_isfunction</A><BR>
<A HREF="manual.html#lua_islightuserdata">lua_islightuserdata</A><BR>
<A HREF="manual.html#lua_isnil">lua_isnil</A><BR>
<A HREF="manual.html#lua_isnone">lua_isnone</A><BR>
<A HREF="manual.html#lua_isnoneornil">lua_isnoneornil</A><BR>
<A HREF="manual.html#lua_isnumber">lua_isnumber</A><BR>
<A HREF="manual.html#lua_isstring">lua_isstring</A><BR>
<A HREF="manual.html#lua_istable">lua_istable</A><BR>
<A HREF="manual.html#lua_isthread">lua_isthread</A><BR>
<A HREF="manual.html#lua_isuserdata">lua_isuserdata</A><BR>
<A HREF="manual.html#lua_lessthan">lua_lessthan</A><BR>
<A HREF="manual.html#lua_load">lua_load</A><BR>
<A HREF="manual.html#lua_newstate">lua_newstate</A><BR>
<A HREF="manual.html#lua_newtable">lua_newtable</A><BR>
<A HREF="manual.html#lua_newthread">lua_newthread</A><BR>
<A HREF="manual.html#lua_newuserdata">lua_newuserdata</A><BR>
<A HREF="manual.html#lua_next">lua_next</A><BR>
<A HREF="manual.html#lua_objlen">lua_objlen</A><BR>
<A HREF="manual.html#lua_pcall">lua_pcall</A><BR>
<A HREF="manual.html#lua_pop">lua_pop</A><BR>
<A HREF="manual.html#lua_pushboolean">lua_pushboolean</A><BR>
<A HREF="manual.html#lua_pushcclosure">lua_pushcclosure</A><BR>
<A HREF="manual.html#lua_pushcfunction">lua_pushcfunction</A><BR>
<A HREF="manual.html#lua_pushfstring">lua_pushfstring</A><BR>
<A HREF="manual.html#lua_pushinteger">lua_pushinteger</A><BR>
<A HREF="manual.html#lua_pushlightuserdata">lua_pushlightuserdata</A><BR>
<A HREF="manual.html#lua_pushliteral">lua_pushliteral</A><BR>
<A HREF="manual.html#lua_pushlstring">lua_pushlstring</A><BR>
<A HREF="manual.html#lua_pushnil">lua_pushnil</A><BR>
<A HREF="manual.html#lua_pushnumber">lua_pushnumber</A><BR>
<A HREF="manual.html#lua_pushstring">lua_pushstring</A><BR>
<A HREF="manual.html#lua_pushthread">lua_pushthread</A><BR>
<A HREF="manual.html#lua_pushvalue">lua_pushvalue</A><BR>
<A HREF="manual.html#lua_pushvfstring">lua_pushvfstring</A><BR>
<A HREF="manual.html#lua_rawequal">lua_rawequal</A><BR>
<A HREF="manual.html#lua_rawget">lua_rawget</A><BR>
<A HREF="manual.html#lua_rawgeti">lua_rawgeti</A><BR>
<A HREF="manual.html#lua_rawset">lua_rawset</A><BR>
<A HREF="manual.html#lua_rawseti">lua_rawseti</A><BR>
<A HREF="manual.html#lua_register">lua_register</A><BR>
<A HREF="manual.html#lua_remove">lua_remove</A><BR>
<A HREF="manual.html#lua_replace">lua_replace</A><BR>
<A HREF="manual.html#lua_resume">lua_resume</A><BR>
<A HREF="manual.html#lua_setallocf">lua_setallocf</A><BR>
<A HREF="manual.html#lua_setfenv">lua_setfenv</A><BR>
<A HREF="manual.html#lua_setfield">lua_setfield</A><BR>
<A HREF="manual.html#lua_setglobal">lua_setglobal</A><BR>
<A HREF="manual.html#lua_sethook">lua_sethook</A><BR>
<A HREF="manual.html#lua_setlocal">lua_setlocal</A><BR>
<A HREF="manual.html#lua_setmetatable">lua_setmetatable</A><BR>
<A HREF="manual.html#lua_settable">lua_settable</A><BR>
<A HREF="manual.html#lua_settop">lua_settop</A><BR>
<A HREF="manual.html#lua_setupvalue">lua_setupvalue</A><BR>
<A HREF="manual.html#lua_status">lua_status</A><BR>
<A HREF="manual.html#lua_toboolean">lua_toboolean</A><BR>
<A HREF="manual.html#lua_tocfunction">lua_tocfunction</A><BR>
<A HREF="manual.html#lua_tointeger">lua_tointeger</A><BR>
<A HREF="manual.html#lua_tolstring">lua_tolstring</A><BR>
<A HREF="manual.html#lua_tonumber">lua_tonumber</A><BR>
<A HREF="manual.html#lua_topointer">lua_topointer</A><BR>
<A HREF="manual.html#lua_tostring">lua_tostring</A><BR>
<A HREF="manual.html#lua_tothread">lua_tothread</A><BR>
<A HREF="manual.html#lua_touserdata">lua_touserdata</A><BR>
<A HREF="manual.html#lua_type">lua_type</A><BR>
<A HREF="manual.html#lua_typename">lua_typename</A><BR>
<A HREF="manual.html#lua_upvalueindex">lua_upvalueindex</A><BR>
<A HREF="manual.html#lua_xmove">lua_xmove</A><BR>
<A HREF="manual.html#lua_yield">lua_yield</A><BR>
</TD>
<TD>
<H3>auxiliary library</H3>
<A HREF="manual.html#luaL_Buffer">luaL_Buffer</A><BR>
<A HREF="manual.html#luaL_Reg">luaL_Reg</A><BR>
<P>
<A HREF="manual.html#luaL_addchar">luaL_addchar</A><BR>
<A HREF="manual.html#luaL_addlstring">luaL_addlstring</A><BR>
<A HREF="manual.html#luaL_addsize">luaL_addsize</A><BR>
<A HREF="manual.html#luaL_addstring">luaL_addstring</A><BR>
<A HREF="manual.html#luaL_addvalue">luaL_addvalue</A><BR>
<A HREF="manual.html#luaL_argcheck">luaL_argcheck</A><BR>
<A HREF="manual.html#luaL_argerror">luaL_argerror</A><BR>
<A HREF="manual.html#luaL_buffinit">luaL_buffinit</A><BR>
<A HREF="manual.html#luaL_callmeta">luaL_callmeta</A><BR>
<A HREF="manual.html#luaL_checkany">luaL_checkany</A><BR>
<A HREF="manual.html#luaL_checkint">luaL_checkint</A><BR>
<A HREF="manual.html#luaL_checkinteger">luaL_checkinteger</A><BR>
<A HREF="manual.html#luaL_checklong">luaL_checklong</A><BR>
<A HREF="manual.html#luaL_checklstring">luaL_checklstring</A><BR>
<A HREF="manual.html#luaL_checknumber">luaL_checknumber</A><BR>
<A HREF="manual.html#luaL_checkoption">luaL_checkoption</A><BR>
<A HREF="manual.html#luaL_checkstack">luaL_checkstack</A><BR>
<A HREF="manual.html#luaL_checkstring">luaL_checkstring</A><BR>
<A HREF="manual.html#luaL_checktype">luaL_checktype</A><BR>
<A HREF="manual.html#luaL_checkudata">luaL_checkudata</A><BR>
<A HREF="manual.html#luaL_dofile">luaL_dofile</A><BR>
<A HREF="manual.html#luaL_dostring">luaL_dostring</A><BR>
<A HREF="manual.html#luaL_error">luaL_error</A><BR>
<A HREF="manual.html#luaL_getmetafield">luaL_getmetafield</A><BR>
<A HREF="manual.html#luaL_getmetatable">luaL_getmetatable</A><BR>
<A HREF="manual.html#luaL_gsub">luaL_gsub</A><BR>
<A HREF="manual.html#luaL_loadbuffer">luaL_loadbuffer</A><BR>
<A HREF="manual.html#luaL_loadfile">luaL_loadfile</A><BR>
<A HREF="manual.html#luaL_loadstring">luaL_loadstring</A><BR>
<A HREF="manual.html#luaL_newmetatable">luaL_newmetatable</A><BR>
<A HREF="manual.html#luaL_newstate">luaL_newstate</A><BR>
<A HREF="manual.html#luaL_openlibs">luaL_openlibs</A><BR>
<A HREF="manual.html#luaL_optint">luaL_optint</A><BR>
<A HREF="manual.html#luaL_optinteger">luaL_optinteger</A><BR>
<A HREF="manual.html#luaL_optlong">luaL_optlong</A><BR>
<A HREF="manual.html#luaL_optlstring">luaL_optlstring</A><BR>
<A HREF="manual.html#luaL_optnumber">luaL_optnumber</A><BR>
<A HREF="manual.html#luaL_optstring">luaL_optstring</A><BR>
<A HREF="manual.html#luaL_prepbuffer">luaL_prepbuffer</A><BR>
<A HREF="manual.html#luaL_pushresult">luaL_pushresult</A><BR>
<A HREF="manual.html#luaL_ref">luaL_ref</A><BR>
<A HREF="manual.html#luaL_register">luaL_register</A><BR>
<A HREF="manual.html#luaL_typename">luaL_typename</A><BR>
<A HREF="manual.html#luaL_typerror">luaL_typerror</A><BR>
<A HREF="manual.html#luaL_unref">luaL_unref</A><BR>
<A HREF="manual.html#luaL_where">luaL_where</A><BR>
</TD>
</TR>
</TABLE>
<P>
<HR>
<SMALL CLASS="footer">
Last update:
Mon Feb 13 18:53:32 BRST 2012
</SMALL>
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Last change: revised for Lua 5.1.5
-->
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.\" $Id: lua.man,v 1.11 2006/01/06 16:03:34 lhf Exp $
.TH LUA 1 "$Date: 2006/01/06 16:03:34 $"
.SH NAME
lua \- Lua interpreter
.SH SYNOPSIS
.B lua
[
.I options
]
[
.I script
[
.I args
]
]
.SH DESCRIPTION
.B lua
is the stand-alone Lua interpreter.
It loads and executes Lua programs,
either in textual source form or
in precompiled binary form.
(Precompiled binaries are output by
.BR luac ,
the Lua compiler.)
.B lua
can be used as a batch interpreter and also interactively.
.LP
The given
.I options
(see below)
are executed and then
the Lua program in file
.I script
is loaded and executed.
The given
.I args
are available to
.I script
as strings in a global table named
.BR arg .
If these arguments contain spaces or other characters special to the shell,
then they should be quoted
(but note that the quotes will be removed by the shell).
The arguments in
.B arg
start at 0,
which contains the string
.RI ' script '.
The index of the last argument is stored in
.BR arg.n .
The arguments given in the command line before
.IR script ,
including the name of the interpreter,
are available in negative indices in
.BR arg .
.LP
At the very start,
before even handling the command line,
.B lua
executes the contents of the environment variable
.BR LUA_INIT ,
if it is defined.
If the value of
.B LUA_INIT
is of the form
.RI '@ filename ',
then
.I filename
is executed.
Otherwise, the string is assumed to be a Lua statement and is executed.
.LP
Options start with
.B '\-'
and are described below.
You can use
.B "'\--'"
to signal the end of options.
.LP
If no arguments are given,
then
.B "\-v \-i"
is assumed when the standard input is a terminal;
otherwise,
.B "\-"
is assumed.
.LP
In interactive mode,
.B lua
prompts the user,
reads lines from the standard input,
and executes them as they are read.
If a line does not contain a complete statement,
then a secondary prompt is displayed and
lines are read until a complete statement is formed or
a syntax error is found.
So, one way to interrupt the reading of an incomplete statement is
to force a syntax error:
adding a
.B ';'
in the middle of a statement is a sure way of forcing a syntax error
(except inside multiline strings and comments; these must be closed explicitly).
If a line starts with
.BR '=' ,
then
.B lua
displays the values of all the expressions in the remainder of the
line. The expressions must be separated by commas.
The primary prompt is the value of the global variable
.BR _PROMPT ,
if this value is a string;
otherwise, the default prompt is used.
Similarly, the secondary prompt is the value of the global variable
.BR _PROMPT2 .
So,
to change the prompts,
set the corresponding variable to a string of your choice.
You can do that after calling the interpreter
or on the command line
(but in this case you have to be careful with quotes
if the prompt string contains a space; otherwise you may confuse the shell.)
The default prompts are "> " and ">> ".
.SH OPTIONS
.TP
.B \-
load and execute the standard input as a file,
that is,
not interactively,
even when the standard input is a terminal.
.TP
.BI \-e " stat"
execute statement
.IR stat .
You need to quote
.I stat
if it contains spaces, quotes,
or other characters special to the shell.
.TP
.B \-i
enter interactive mode after
.I script
is executed.
.TP
.BI \-l " name"
call
.BI require(' name ')
before executing
.IR script .
Typically used to load libraries.
.TP
.B \-v
show version information.
.SH "SEE ALSO"
.BR luac (1)
.br
http://www.lua.org/
.SH DIAGNOSTICS
Error messages should be self explanatory.
.SH AUTHORS
R. Ierusalimschy,
L. H. de Figueiredo,
and
W. Celes
.\" EOF

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body {
color: #000000 ;
background-color: #FFFFFF ;
font-family: Helvetica, Arial, sans-serif ;
text-align: justify ;
margin-right: 30px ;
margin-left: 30px ;
}
h1, h2, h3, h4 {
font-family: Verdana, Geneva, sans-serif ;
font-weight: normal ;
font-style: italic ;
}
h2 {
padding-top: 0.4em ;
padding-bottom: 0.4em ;
padding-left: 30px ;
padding-right: 30px ;
margin-left: -30px ;
background-color: #E0E0FF ;
}
h3 {
padding-left: 0.5em ;
border-left: solid #E0E0FF 1em ;
}
table h3 {
padding-left: 0px ;
border-left: none ;
}
a:link {
color: #000080 ;
background-color: inherit ;
text-decoration: none ;
}
a:visited {
background-color: inherit ;
text-decoration: none ;
}
a:link:hover, a:visited:hover {
color: #000080 ;
background-color: #E0E0FF ;
}
a:link:active, a:visited:active {
color: #FF0000 ;
}
hr {
border: 0 ;
height: 1px ;
color: #a0a0a0 ;
background-color: #a0a0a0 ;
}
:target {
background-color: #F8F8F8 ;
padding: 8px ;
border: solid #a0a0a0 2px ;
}
.footer {
color: gray ;
font-size: small ;
}
input[type=text] {
border: solid #a0a0a0 2px ;
border-radius: 2em ;
-moz-border-radius: 2em ;
background-image: url('images/search.png') ;
background-repeat: no-repeat;
background-position: 4px center ;
padding-left: 20px ;
height: 2em ;
}

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<!-- $Id: lua.man,v 1.11 2006/01/06 16:03:34 lhf Exp $ -->
<HTML>
<HEAD>
<TITLE>LUA man page</TITLE>
<LINK REL="stylesheet" TYPE="text/css" HREF="lua.css">
</HEAD>
<BODY BGCOLOR="#FFFFFF">
<H2>NAME</H2>
lua - Lua interpreter
<H2>SYNOPSIS</H2>
<B>lua</B>
[
<I>options</I>
]
[
<I>script</I>
[
<I>args</I>
]
]
<H2>DESCRIPTION</H2>
<B>lua</B>
is the stand-alone Lua interpreter.
It loads and executes Lua programs,
either in textual source form or
in precompiled binary form.
(Precompiled binaries are output by
<B>luac</B>,
the Lua compiler.)
<B>lua</B>
can be used as a batch interpreter and also interactively.
<P>
The given
<I>options</I>
(see below)
are executed and then
the Lua program in file
<I>script</I>
is loaded and executed.
The given
<I>args</I>
are available to
<I>script</I>
as strings in a global table named
<B>arg</B>.
If these arguments contain spaces or other characters special to the shell,
then they should be quoted
(but note that the quotes will be removed by the shell).
The arguments in
<B>arg</B>
start at 0,
which contains the string
'<I>script</I>'.
The index of the last argument is stored in
<B>arg.n</B>.
The arguments given in the command line before
<I>script</I>,
including the name of the interpreter,
are available in negative indices in
<B>arg</B>.
<P>
At the very start,
before even handling the command line,
<B>lua</B>
executes the contents of the environment variable
<B>LUA_INIT</B>,
if it is defined.
If the value of
<B>LUA_INIT</B>
is of the form
'@<I>filename</I>',
then
<I>filename</I>
is executed.
Otherwise, the string is assumed to be a Lua statement and is executed.
<P>
Options start with
<B>'-'</B>
and are described below.
You can use
<B>'--'</B>
to signal the end of options.
<P>
If no arguments are given,
then
<B>"-v -i"</B>
is assumed when the standard input is a terminal;
otherwise,
<B>"-"</B>
is assumed.
<P>
In interactive mode,
<B>lua</B>
prompts the user,
reads lines from the standard input,
and executes them as they are read.
If a line does not contain a complete statement,
then a secondary prompt is displayed and
lines are read until a complete statement is formed or
a syntax error is found.
So, one way to interrupt the reading of an incomplete statement is
to force a syntax error:
adding a
<B>';'</B>
in the middle of a statement is a sure way of forcing a syntax error
(except inside multiline strings and comments; these must be closed explicitly).
If a line starts with
<B>'='</B>,
then
<B>lua</B>
displays the values of all the expressions in the remainder of the
line. The expressions must be separated by commas.
The primary prompt is the value of the global variable
<B>_PROMPT</B>,
if this value is a string;
otherwise, the default prompt is used.
Similarly, the secondary prompt is the value of the global variable
<B>_PROMPT2</B>.
So,
to change the prompts,
set the corresponding variable to a string of your choice.
You can do that after calling the interpreter
or on the command line
(but in this case you have to be careful with quotes
if the prompt string contains a space; otherwise you may confuse the shell.)
The default prompts are "&gt; " and "&gt;&gt; ".
<H2>OPTIONS</H2>
<P>
<B>-</B>
load and execute the standard input as a file,
that is,
not interactively,
even when the standard input is a terminal.
<P>
<B>-e </B><I>stat</I>
execute statement
<I>stat</I>.
You need to quote
<I>stat </I>
if it contains spaces, quotes,
or other characters special to the shell.
<P>
<B>-i</B>
enter interactive mode after
<I>script</I>
is executed.
<P>
<B>-l </B><I>name</I>
call
<B>require</B>('<I>name</I>')
before executing
<I>script</I>.
Typically used to load libraries.
<P>
<B>-v</B>
show version information.
<H2>SEE ALSO</H2>
<B>luac</B>(1)
<BR>
<A HREF="http://www.lua.org/">http://www.lua.org/</A>
<H2>DIAGNOSTICS</H2>
Error messages should be self explanatory.
<H2>AUTHORS</H2>
R. Ierusalimschy,
L. H. de Figueiredo,
and
W. Celes
<!-- EOF -->
</BODY>
</HTML>

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.\" $Id: luac.man,v 1.28 2006/01/06 16:03:34 lhf Exp $
.TH LUAC 1 "$Date: 2006/01/06 16:03:34 $"
.SH NAME
luac \- Lua compiler
.SH SYNOPSIS
.B luac
[
.I options
] [
.I filenames
]
.SH DESCRIPTION
.B luac
is the Lua compiler.
It translates programs written in the Lua programming language
into binary files that can be later loaded and executed.
.LP
The main advantages of precompiling chunks are:
faster loading,
protecting source code from accidental user changes,
and
off-line syntax checking.
.LP
Pre-compiling does not imply faster execution
because in Lua chunks are always compiled into bytecodes before being executed.
.B luac
simply allows those bytecodes to be saved in a file for later execution.
.LP
Pre-compiled chunks are not necessarily smaller than the corresponding source.
The main goal in pre-compiling is faster loading.
.LP
The binary files created by
.B luac
are portable only among architectures with the same word size and byte order.
.LP
.B luac
produces a single output file containing the bytecodes
for all source files given.
By default,
the output file is named
.BR luac.out ,
but you can change this with the
.B \-o
option.
.LP
In the command line,
you can mix
text files containing Lua source and
binary files containing precompiled chunks.
This is useful to combine several precompiled chunks,
even from different (but compatible) platforms,
into a single precompiled chunk.
.LP
You can use
.B "'\-'"
to indicate the standard input as a source file
and
.B "'\--'"
to signal the end of options
(that is,
all remaining arguments will be treated as files even if they start with
.BR "'\-'" ).
.LP
The internal format of the binary files produced by
.B luac
is likely to change when a new version of Lua is released.
So,
save the source files of all Lua programs that you precompile.
.LP
.SH OPTIONS
Options must be separate.
.TP
.B \-l
produce a listing of the compiled bytecode for Lua's virtual machine.
Listing bytecodes is useful to learn about Lua's virtual machine.
If no files are given, then
.B luac
loads
.B luac.out
and lists its contents.
.TP
.BI \-o " file"
output to
.IR file ,
instead of the default
.BR luac.out .
(You can use
.B "'\-'"
for standard output,
but not on platforms that open standard output in text mode.)
The output file may be a source file because
all files are loaded before the output file is written.
Be careful not to overwrite precious files.
.TP
.B \-p
load files but do not generate any output file.
Used mainly for syntax checking and for testing precompiled chunks:
corrupted files will probably generate errors when loaded.
Lua always performs a thorough integrity test on precompiled chunks.
Bytecode that passes this test is completely safe,
in the sense that it will not break the interpreter.
However,
there is no guarantee that such code does anything sensible.
(None can be given, because the halting problem is unsolvable.)
If no files are given, then
.B luac
loads
.B luac.out
and tests its contents.
No messages are displayed if the file passes the integrity test.
.TP
.B \-s
strip debug information before writing the output file.
This saves some space in very large chunks,
but if errors occur when running a stripped chunk,
then the error messages may not contain the full information they usually do.
For instance,
line numbers and names of local variables are lost.
.TP
.B \-v
show version information.
.SH FILES
.TP 15
.B luac.out
default output file
.SH "SEE ALSO"
.BR lua (1)
.br
http://www.lua.org/
.SH DIAGNOSTICS
Error messages should be self explanatory.
.SH AUTHORS
L. H. de Figueiredo,
R. Ierusalimschy and
W. Celes
.\" EOF

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<!-- $Id: luac.man,v 1.28 2006/01/06 16:03:34 lhf Exp $ -->
<HTML>
<HEAD>
<TITLE>LUAC man page</TITLE>
<LINK REL="stylesheet" TYPE="text/css" HREF="lua.css">
</HEAD>
<BODY BGCOLOR="#FFFFFF">
<H2>NAME</H2>
luac - Lua compiler
<H2>SYNOPSIS</H2>
<B>luac</B>
[
<I>options</I>
] [
<I>filenames</I>
]
<H2>DESCRIPTION</H2>
<B>luac</B>
is the Lua compiler.
It translates programs written in the Lua programming language
into binary files that can be later loaded and executed.
<P>
The main advantages of precompiling chunks are:
faster loading,
protecting source code from accidental user changes,
and
off-line syntax checking.
<P>
Precompiling does not imply faster execution
because in Lua chunks are always compiled into bytecodes before being executed.
<B>luac</B>
simply allows those bytecodes to be saved in a file for later execution.
<P>
Precompiled chunks are not necessarily smaller than the corresponding source.
The main goal in precompiling is faster loading.
<P>
The binary files created by
<B>luac</B>
are portable only among architectures with the same word size and byte order.
<P>
<B>luac</B>
produces a single output file containing the bytecodes
for all source files given.
By default,
the output file is named
<B>luac.out</B>,
but you can change this with the
<B>-o</B>
option.
<P>
In the command line,
you can mix
text files containing Lua source and
binary files containing precompiled chunks.
This is useful because several precompiled chunks,
even from different (but compatible) platforms,
can be combined into a single precompiled chunk.
<P>
You can use
<B>'-'</B>
to indicate the standard input as a source file
and
<B>'--'</B>
to signal the end of options
(that is,
all remaining arguments will be treated as files even if they start with
<B>'-'</B>).
<P>
The internal format of the binary files produced by
<B>luac</B>
is likely to change when a new version of Lua is released.
So,
save the source files of all Lua programs that you precompile.
<P>
<H2>OPTIONS</H2>
Options must be separate.
<P>
<B>-l</B>
produce a listing of the compiled bytecode for Lua's virtual machine.
Listing bytecodes is useful to learn about Lua's virtual machine.
If no files are given, then
<B>luac</B>
loads
<B>luac.out</B>
and lists its contents.
<P>
<B>-o </B><I>file</I>
output to
<I>file</I>,
instead of the default
<B>luac.out</B>.
(You can use
<B>'-'</B>
for standard output,
but not on platforms that open standard output in text mode.)
The output file may be a source file because
all files are loaded before the output file is written.
Be careful not to overwrite precious files.
<P>
<B>-p</B>
load files but do not generate any output file.
Used mainly for syntax checking and for testing precompiled chunks:
corrupted files will probably generate errors when loaded.
Lua always performs a thorough integrity test on precompiled chunks.
Bytecode that passes this test is completely safe,
in the sense that it will not break the interpreter.
However,
there is no guarantee that such code does anything sensible.
(None can be given, because the halting problem is unsolvable.)
If no files are given, then
<B>luac</B>
loads
<B>luac.out</B>
and tests its contents.
No messages are displayed if the file passes the integrity test.
<P>
<B>-s</B>
strip debug information before writing the output file.
This saves some space in very large chunks,
but if errors occur when running a stripped chunk,
then the error messages may not contain the full information they usually do.
For instance,
line numbers and names of local variables are lost.
<P>
<B>-v</B>
show version information.
<H2>FILES</H2>
<P>
<B>luac.out</B>
default output file
<H2>SEE ALSO</H2>
<B>lua</B>(1)
<BR>
<A HREF="http://www.lua.org/">http://www.lua.org/</A>
<H2>DIAGNOSTICS</H2>
Error messages should be self explanatory.
<H2>AUTHORS</H2>
L. H. de Figueiredo,
R. Ierusalimschy and
W. Celes
<!-- EOF -->
</BODY>
</HTML>

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h3 code {
font-family: inherit ;
font-size: inherit ;
}
pre, code {
font-size: 12pt ;
}
span.apii {
float: right ;
font-family: inherit ;
font-style: normal ;
font-size: small ;
color: gray ;
}
p+h1, ul+h1 {
padding-top: 0.4em ;
padding-bottom: 0.4em ;
padding-left: 30px ;
margin-left: -30px ;
background-color: #E0E0FF ;
}

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<HTML>
<HEAD>
<TITLE>Lua documentation</TITLE>
<LINK REL="stylesheet" TYPE="text/css" HREF="lua.css">
</HEAD>
<BODY>
<HR>
<H1>
<A HREF="http://www.lua.org/"><IMG SRC="logo.gif" ALT="Lua" BORDER=0></A>
Documentation
</H1>
This is the documentation included in the source distribution of Lua 5.1.5.
<UL>
<LI><A HREF="contents.html">Reference manual</A>
<LI><A HREF="lua.html">lua man page</A>
<LI><A HREF="luac.html">luac man page</A>
<LI><A HREF="../README">lua/README</A>
<LI><A HREF="../etc/README">lua/etc/README</A>
<LI><A HREF="../test/README">lua/test/README</A>
</UL>
Lua's
<A HREF="http://www.lua.org/">official web site</A>
contains updated documentation,
especially the
<A HREF="http://www.lua.org/manual/5.1/">reference manual</A>.
<P>
<HR>
<SMALL>
Last update:
Fri Feb 3 09:44:42 BRST 2012
</SMALL>
</BODY>
</HTML>

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# makefile for Lua etc
TOP= ..
LIB= $(TOP)/src
INC= $(TOP)/src
BIN= $(TOP)/src
SRC= $(TOP)/src
TST= $(TOP)/test
CC= gcc
CFLAGS= -O2 -Wall -I$(INC) $(MYCFLAGS)
MYCFLAGS=
MYLDFLAGS= -Wl,-E
MYLIBS= -lm
#MYLIBS= -lm -Wl,-E -ldl -lreadline -lhistory -lncurses
RM= rm -f
default:
@echo 'Please choose a target: min noparser one strict clean'
min: min.c
$(CC) $(CFLAGS) $@.c -L$(LIB) -llua $(MYLIBS)
echo 'print"Hello there!"' | ./a.out
noparser: noparser.o
$(CC) noparser.o $(SRC)/lua.o -L$(LIB) -llua $(MYLIBS)
$(BIN)/luac $(TST)/hello.lua
-./a.out luac.out
-./a.out -e'a=1'
one:
$(CC) $(CFLAGS) all.c $(MYLIBS)
./a.out $(TST)/hello.lua
strict:
-$(BIN)/lua -e 'print(a);b=2'
-$(BIN)/lua -lstrict -e 'print(a)'
-$(BIN)/lua -e 'function f() b=2 end f()'
-$(BIN)/lua -lstrict -e 'function f() b=2 end f()'
clean:
$(RM) a.out core core.* *.o luac.out
.PHONY: default min noparser one strict clean

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This directory contains some useful files and code.
Unlike the code in ../src, everything here is in the public domain.
If any of the makes fail, you're probably not using the same libraries
used to build Lua. Set MYLIBS in Makefile accordingly.
all.c
Full Lua interpreter in a single file.
Do "make one" for a demo.
lua.hpp
Lua header files for C++ using 'extern "C"'.
lua.ico
A Lua icon for Windows (and web sites: save as favicon.ico).
Drawn by hand by Markus Gritsch <gritsch@iue.tuwien.ac.at>.
lua.pc
pkg-config data for Lua
luavs.bat
Script to build Lua under "Visual Studio .NET Command Prompt".
Run it from the toplevel as etc\luavs.bat.
min.c
A minimal Lua interpreter.
Good for learning and for starting your own.
Do "make min" for a demo.
noparser.c
Linking with noparser.o avoids loading the parsing modules in lualib.a.
Do "make noparser" for a demo.
strict.lua
Traps uses of undeclared global variables.
Do "make strict" for a demo.

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/*
* all.c -- Lua core, libraries and interpreter in a single file
*/
#define luaall_c
#include "lapi.c"
#include "lcode.c"
#include "ldebug.c"
#include "ldo.c"
#include "ldump.c"
#include "lfunc.c"
#include "lgc.c"
#include "llex.c"
#include "lmem.c"
#include "lobject.c"
#include "lopcodes.c"
#include "lparser.c"
#include "lstate.c"
#include "lstring.c"
#include "ltable.c"
#include "ltm.c"
#include "lundump.c"
#include "lvm.c"
#include "lzio.c"
#include "lauxlib.c"
#include "lbaselib.c"
#include "ldblib.c"
#include "liolib.c"
#include "linit.c"
#include "lmathlib.c"
#include "loadlib.c"
#include "loslib.c"
#include "lstrlib.c"
#include "ltablib.c"
#include "lua.c"

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// 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"
}

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# lua.pc -- pkg-config data for Lua
# vars from install Makefile
# grep '^V=' ../Makefile
V= 5.1
# grep '^R=' ../Makefile
R= 5.1.5
# grep '^INSTALL_.*=' ../Makefile | sed 's/INSTALL_TOP/prefix/'
prefix= /usr/local
INSTALL_BIN= ${prefix}/bin
INSTALL_INC= ${prefix}/include
INSTALL_LIB= ${prefix}/lib
INSTALL_MAN= ${prefix}/man/man1
INSTALL_LMOD= ${prefix}/share/lua/${V}
INSTALL_CMOD= ${prefix}/lib/lua/${V}
# canonical vars
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: Lua
Description: An Extensible Extension Language
Version: ${R}
Requires:
Libs: -L${libdir} -llua -lm
Cflags: -I${includedir}
# (end of lua.pc)

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@rem Script to build Lua under "Visual Studio .NET Command Prompt".
@rem Do not run from this directory; run it from the toplevel: etc\luavs.bat .
@rem It creates lua51.dll, lua51.lib, lua.exe, and luac.exe in src.
@rem (contributed by David Manura and Mike Pall)
@setlocal
@set MYCOMPILE=cl /nologo /MD /O2 /W3 /c /D_CRT_SECURE_NO_DEPRECATE
@set MYLINK=link /nologo
@set MYMT=mt /nologo
cd src
%MYCOMPILE% /DLUA_BUILD_AS_DLL l*.c
del lua.obj luac.obj
%MYLINK% /DLL /out:lua51.dll l*.obj
if exist lua51.dll.manifest^
%MYMT% -manifest lua51.dll.manifest -outputresource:lua51.dll;2
%MYCOMPILE% /DLUA_BUILD_AS_DLL lua.c
%MYLINK% /out:lua.exe lua.obj lua51.lib
if exist lua.exe.manifest^
%MYMT% -manifest lua.exe.manifest -outputresource:lua.exe
%MYCOMPILE% l*.c print.c
del lua.obj linit.obj lbaselib.obj ldblib.obj liolib.obj lmathlib.obj^
loslib.obj ltablib.obj lstrlib.obj loadlib.obj
%MYLINK% /out:luac.exe *.obj
if exist luac.exe.manifest^
%MYMT% -manifest luac.exe.manifest -outputresource:luac.exe
del *.obj *.manifest
cd ..

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/*
* min.c -- a minimal Lua interpreter
* loads stdin only with minimal error handling.
* no interaction, and no standard library, only a "print" function.
*/
#include <stdio.h>
#include "lua.h"
#include "lauxlib.h"
static int print(lua_State *L)
{
int n=lua_gettop(L);
int i;
for (i=1; i<=n; i++)
{
if (i>1) printf("\t");
if (lua_isstring(L,i))
printf("%s",lua_tostring(L,i));
else if (lua_isnil(L,i))
printf("%s","nil");
else if (lua_isboolean(L,i))
printf("%s",lua_toboolean(L,i) ? "true" : "false");
else
printf("%s:%p",luaL_typename(L,i),lua_topointer(L,i));
}
printf("\n");
return 0;
}
int main(void)
{
lua_State *L=lua_open();
lua_register(L,"print",print);
if (luaL_dofile(L,NULL)!=0) fprintf(stderr,"%s\n",lua_tostring(L,-1));
lua_close(L);
return 0;
}

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/*
* The code below can be used to make a Lua core that does not contain the
* parsing modules (lcode, llex, lparser), which represent 35% of the total core.
* You'll only be able to load binary files and strings, precompiled with luac.
* (Of course, you'll have to build luac with the original parsing modules!)
*
* To use this module, simply compile it ("make noparser" does that) and list
* its object file before the Lua libraries. The linker should then not load
* the parsing modules. To try it, do "make luab".
*
* If you also want to avoid the dump module (ldump.o), define NODUMP.
* #define NODUMP
*/
#define LUA_CORE
#include "llex.h"
#include "lparser.h"
#include "lzio.h"
LUAI_FUNC void luaX_init (lua_State *L) {
UNUSED(L);
}
LUAI_FUNC Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, const char *name) {
UNUSED(z);
UNUSED(buff);
UNUSED(name);
lua_pushliteral(L,"parser not loaded");
lua_error(L);
return NULL;
}
#ifdef NODUMP
#include "lundump.h"
LUAI_FUNC int luaU_dump (lua_State* L, const Proto* f, lua_Writer w, void* data, int strip) {
UNUSED(f);
UNUSED(w);
UNUSED(data);
UNUSED(strip);
#if 1
UNUSED(L);
return 0;
#else
lua_pushliteral(L,"dumper not loaded");
lua_error(L);
#endif
}
#endif

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--
-- strict.lua
-- checks uses of undeclared global variables
-- All global variables must be 'declared' through a regular assignment
-- (even assigning nil will do) in a main chunk before being used
-- anywhere or assigned to inside a function.
--
local getinfo, error, rawset, rawget = debug.getinfo, error, rawset, rawget
local mt = getmetatable(_G)
if mt == nil then
mt = {}
setmetatable(_G, mt)
end
mt.__declared = {}
local function what ()
local d = getinfo(3, "S")
return d and d.what or "C"
end
mt.__newindex = function (t, n, v)
if not mt.__declared[n] then
local w = what()
if w ~= "main" and w ~= "C" then
error("assign to undeclared variable '"..n.."'", 2)
end
mt.__declared[n] = true
end
rawset(t, n, v)
end
mt.__index = function (t, n)
if not mt.__declared[n] and what() ~= "C" then
error("variable '"..n.."' is not declared", 2)
end
return rawget(t, n)
end

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# makefile for building Lua
# see ../INSTALL for installation instructions
# see ../Makefile and luaconf.h for further customization
# == CHANGE THE SETTINGS BELOW TO SUIT YOUR ENVIRONMENT =======================
# Your platform. See PLATS for possible values.
PLAT= none
CC= gcc
CFLAGS= -O2 -Wall $(MYCFLAGS)
AR= ar rcu
RANLIB= ranlib
RM= rm -f
LIBS= -lm $(MYLIBS)
MYCFLAGS=
MYLDFLAGS=
MYLIBS=
# == END OF USER SETTINGS. NO NEED TO CHANGE ANYTHING BELOW THIS LINE =========
PLATS= aix ansi bsd freebsd generic linux macosx mingw posix solaris
LUA_A= liblua.a
CORE_O= lapi.o lcode.o ldebug.o ldo.o ldump.o lfunc.o lgc.o llex.o lmem.o \
lobject.o lopcodes.o lparser.o lstate.o lstring.o ltable.o ltm.o \
lundump.o lvm.o lzio.o
LIB_O= lauxlib.o lbaselib.o ldblib.o liolib.o lmathlib.o loslib.o ltablib.o \
lstrlib.o loadlib.o linit.o
LUA_T= lua
LUA_O= lua.o
LUAC_T= luac
LUAC_O= luac.o print.o
ALL_O= $(CORE_O) $(LIB_O) $(LUA_O) $(LUAC_O)
ALL_T= $(LUA_A) $(LUA_T) $(LUAC_T)
ALL_A= $(LUA_A)
default: $(PLAT)
all: $(ALL_T)
o: $(ALL_O)
a: $(ALL_A)
$(LUA_A): $(CORE_O) $(LIB_O)
$(AR) $@ $(CORE_O) $(LIB_O) # DLL needs all object files
$(RANLIB) $@
$(LUA_T): $(LUA_O) $(LUA_A)
$(CC) -o $@ $(MYLDFLAGS) $(LUA_O) $(LUA_A) $(LIBS)
$(LUAC_T): $(LUAC_O) $(LUA_A)
$(CC) -o $@ $(MYLDFLAGS) $(LUAC_O) $(LUA_A) $(LIBS)
clean:
$(RM) $(ALL_T) $(ALL_O)
depend:
@$(CC) $(CFLAGS) -MM l*.c print.c
echo:
@echo "PLAT = $(PLAT)"
@echo "CC = $(CC)"
@echo "CFLAGS = $(CFLAGS)"
@echo "AR = $(AR)"
@echo "RANLIB = $(RANLIB)"
@echo "RM = $(RM)"
@echo "MYCFLAGS = $(MYCFLAGS)"
@echo "MYLDFLAGS = $(MYLDFLAGS)"
@echo "MYLIBS = $(MYLIBS)"
# convenience targets for popular platforms
none:
@echo "Please choose a platform:"
@echo " $(PLATS)"
aix:
$(MAKE) all CC="xlc" CFLAGS="-O2 -DLUA_USE_POSIX -DLUA_USE_DLOPEN" MYLIBS="-ldl" MYLDFLAGS="-brtl -bexpall"
ansi:
$(MAKE) all MYCFLAGS=-DLUA_ANSI
bsd:
$(MAKE) all MYCFLAGS="-DLUA_USE_POSIX -DLUA_USE_DLOPEN" MYLIBS="-Wl,-E"
freebsd:
$(MAKE) all MYCFLAGS="-DLUA_USE_LINUX" MYLIBS="-Wl,-E -lreadline"
generic:
$(MAKE) all MYCFLAGS=
linux:
$(MAKE) all MYCFLAGS=-DLUA_USE_LINUX MYLIBS="-Wl,-E -ldl -lreadline -lhistory -lncurses"
macosx:
$(MAKE) all MYCFLAGS=-DLUA_USE_LINUX MYLIBS="-lreadline"
# use this on Mac OS X 10.3-
# $(MAKE) all MYCFLAGS=-DLUA_USE_MACOSX
mingw:
$(MAKE) "LUA_A=lua51.dll" "LUA_T=lua.exe" \
"AR=$(CC) -shared -o" "RANLIB=strip --strip-unneeded" \
"MYCFLAGS=-DLUA_BUILD_AS_DLL" "MYLIBS=" "MYLDFLAGS=-s" lua.exe
$(MAKE) "LUAC_T=luac.exe" luac.exe
posix:
$(MAKE) all MYCFLAGS=-DLUA_USE_POSIX
solaris:
$(MAKE) all MYCFLAGS="-DLUA_USE_POSIX -DLUA_USE_DLOPEN" MYLIBS="-ldl"
# list targets that do not create files (but not all makes understand .PHONY)
.PHONY: all $(PLATS) default o a clean depend echo none
# DO NOT DELETE
lapi.o: lapi.c lua.h luaconf.h lapi.h lobject.h llimits.h ldebug.h \
lstate.h ltm.h lzio.h lmem.h ldo.h lfunc.h lgc.h lstring.h ltable.h \
lundump.h lvm.h
lauxlib.o: lauxlib.c lua.h luaconf.h lauxlib.h
lbaselib.o: lbaselib.c lua.h luaconf.h lauxlib.h lualib.h
lcode.o: lcode.c lua.h luaconf.h lcode.h llex.h lobject.h llimits.h \
lzio.h lmem.h lopcodes.h lparser.h ldebug.h lstate.h ltm.h ldo.h lgc.h \
ltable.h
ldblib.o: ldblib.c lua.h luaconf.h lauxlib.h lualib.h
ldebug.o: ldebug.c lua.h luaconf.h lapi.h lobject.h llimits.h lcode.h \
llex.h lzio.h lmem.h lopcodes.h lparser.h ldebug.h lstate.h ltm.h ldo.h \
lfunc.h lstring.h lgc.h ltable.h lvm.h
ldo.o: ldo.c lua.h luaconf.h ldebug.h lstate.h lobject.h llimits.h ltm.h \
lzio.h lmem.h ldo.h lfunc.h lgc.h lopcodes.h lparser.h lstring.h \
ltable.h lundump.h lvm.h
ldump.o: ldump.c lua.h luaconf.h lobject.h llimits.h lstate.h ltm.h \
lzio.h lmem.h lundump.h
lfunc.o: lfunc.c lua.h luaconf.h lfunc.h lobject.h llimits.h lgc.h lmem.h \
lstate.h ltm.h lzio.h
lgc.o: lgc.c lua.h luaconf.h ldebug.h lstate.h lobject.h llimits.h ltm.h \
lzio.h lmem.h ldo.h lfunc.h lgc.h lstring.h ltable.h
linit.o: linit.c lua.h luaconf.h lualib.h lauxlib.h
liolib.o: liolib.c lua.h luaconf.h lauxlib.h lualib.h
llex.o: llex.c lua.h luaconf.h ldo.h lobject.h llimits.h lstate.h ltm.h \
lzio.h lmem.h llex.h lparser.h lstring.h lgc.h ltable.h
lmathlib.o: lmathlib.c lua.h luaconf.h lauxlib.h lualib.h
lmem.o: lmem.c lua.h luaconf.h ldebug.h lstate.h lobject.h llimits.h \
ltm.h lzio.h lmem.h ldo.h
loadlib.o: loadlib.c lua.h luaconf.h lauxlib.h lualib.h
lobject.o: lobject.c lua.h luaconf.h ldo.h lobject.h llimits.h lstate.h \
ltm.h lzio.h lmem.h lstring.h lgc.h lvm.h
lopcodes.o: lopcodes.c lopcodes.h llimits.h lua.h luaconf.h
loslib.o: loslib.c lua.h luaconf.h lauxlib.h lualib.h
lparser.o: lparser.c lua.h luaconf.h lcode.h llex.h lobject.h llimits.h \
lzio.h lmem.h lopcodes.h lparser.h ldebug.h lstate.h ltm.h ldo.h \
lfunc.h lstring.h lgc.h ltable.h
lstate.o: lstate.c lua.h luaconf.h ldebug.h lstate.h lobject.h llimits.h \
ltm.h lzio.h lmem.h ldo.h lfunc.h lgc.h llex.h lstring.h ltable.h
lstring.o: lstring.c lua.h luaconf.h lmem.h llimits.h lobject.h lstate.h \
ltm.h lzio.h lstring.h lgc.h
lstrlib.o: lstrlib.c lua.h luaconf.h lauxlib.h lualib.h
ltable.o: ltable.c lua.h luaconf.h ldebug.h lstate.h lobject.h llimits.h \
ltm.h lzio.h lmem.h ldo.h lgc.h ltable.h
ltablib.o: ltablib.c lua.h luaconf.h lauxlib.h lualib.h
ltm.o: ltm.c lua.h luaconf.h lobject.h llimits.h lstate.h ltm.h lzio.h \
lmem.h lstring.h lgc.h ltable.h
lua.o: lua.c lua.h luaconf.h lauxlib.h lualib.h
luac.o: luac.c lua.h luaconf.h lauxlib.h ldo.h lobject.h llimits.h \
lstate.h ltm.h lzio.h lmem.h lfunc.h lopcodes.h lstring.h lgc.h \
lundump.h
lundump.o: lundump.c lua.h luaconf.h ldebug.h lstate.h lobject.h \
llimits.h ltm.h lzio.h lmem.h ldo.h lfunc.h lstring.h lgc.h lundump.h
lvm.o: lvm.c lua.h luaconf.h ldebug.h lstate.h lobject.h llimits.h ltm.h \
lzio.h lmem.h ldo.h lfunc.h lgc.h lopcodes.h lstring.h ltable.h lvm.h
lzio.o: lzio.c lua.h luaconf.h llimits.h lmem.h lstate.h lobject.h ltm.h \
lzio.h
print.o: print.c ldebug.h lstate.h lua.h luaconf.h lobject.h llimits.h \
ltm.h lzio.h lmem.h lopcodes.h lundump.h
# (end of Makefile)

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/*
** $Id: lapi.h,v 2.2.1.1 2007/12/27 13:02:25 roberto Exp $
** Auxiliary functions from Lua API
** See Copyright Notice in lua.h
*/
#ifndef lapi_h
#define lapi_h
#include "lobject.h"
LUAI_FUNC void luaA_pushobject (lua_State *L, const TValue *o);
#endif

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/*
** $Id: lauxlib.c,v 1.159.1.3 2008/01/21 13:20:51 roberto Exp $
** Auxiliary functions for building Lua libraries
** See Copyright Notice in lua.h
*/
#include <ctype.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.
*/
#define lauxlib_c
#define LUA_LIB
#include "lua.h"
#include "lauxlib.h"
#define FREELIST_REF 0 /* free list of references */
/* convert a stack index to positive */
#define abs_index(L, i) ((i) > 0 || (i) <= LUA_REGISTRYINDEX ? (i) : \
lua_gettop(L) + (i) + 1)
/*
** {======================================================
** Error-report functions
** =======================================================
*/
LUALIB_API int luaL_argerror (lua_State *L, int narg, const char *extramsg) {
lua_Debug ar;
if (!lua_getstack(L, 0, &ar)) /* no stack frame? */
return luaL_error(L, "bad argument #%d (%s)", narg, extramsg);
lua_getinfo(L, "n", &ar);
if (strcmp(ar.namewhat, "method") == 0) {
narg--; /* do not count `self' */
if (narg == 0) /* error is in the self argument itself? */
return luaL_error(L, "calling " LUA_QS " on bad self (%s)",
ar.name, extramsg);
}
if (ar.name == NULL)
ar.name = "?";
return luaL_error(L, "bad argument #%d to " LUA_QS " (%s)",
narg, ar.name, extramsg);
}
LUALIB_API int luaL_typerror (lua_State *L, int narg, const char *tname) {
const char *msg = lua_pushfstring(L, "%s expected, got %s",
tname, luaL_typename(L, narg));
return luaL_argerror(L, narg, msg);
}
static void tag_error (lua_State *L, int narg, int tag) {
luaL_typerror(L, narg, lua_typename(L, tag));
}
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_pushliteral(L, ""); /* else, no information available... */
}
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_checkoption (lua_State *L, int narg, const char *def,
const char *const lst[]) {
const char *name = (def) ? luaL_optstring(L, narg, def) :
luaL_checkstring(L, narg);
int i;
for (i=0; lst[i]; i++)
if (strcmp(lst[i], name) == 0)
return i;
return luaL_argerror(L, narg,
lua_pushfstring(L, "invalid option " LUA_QS, name));
}
LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) {
lua_getfield(L, LUA_REGISTRYINDEX, tname); /* get registry.name */
if (!lua_isnil(L, -1)) /* name already in use? */
return 0; /* leave previous value on top, but return 0 */
lua_pop(L, 1);
lua_newtable(L); /* create metatable */
lua_pushvalue(L, -1);
lua_setfield(L, LUA_REGISTRYINDEX, tname); /* registry.name = metatable */
return 1;
}
LUALIB_API void *luaL_checkudata (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? */
lua_getfield(L, LUA_REGISTRYINDEX, tname); /* get correct metatable */
if (lua_rawequal(L, -1, -2)) { /* does it have the correct mt? */
lua_pop(L, 2); /* remove both metatables */
return p;
}
}
}
luaL_typerror(L, ud, tname); /* else error */
return NULL; /* to avoid warnings */
}
LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *mes) {
if (!lua_checkstack(L, space))
luaL_error(L, "stack overflow (%s)", mes);
}
LUALIB_API void luaL_checktype (lua_State *L, int narg, int t) {
if (lua_type(L, narg) != t)
tag_error(L, narg, t);
}
LUALIB_API void luaL_checkany (lua_State *L, int narg) {
if (lua_type(L, narg) == LUA_TNONE)
luaL_argerror(L, narg, "value expected");
}
LUALIB_API const char *luaL_checklstring (lua_State *L, int narg, size_t *len) {
const char *s = lua_tolstring(L, narg, len);
if (!s) tag_error(L, narg, LUA_TSTRING);
return s;
}
LUALIB_API const char *luaL_optlstring (lua_State *L, int narg,
const char *def, size_t *len) {
if (lua_isnoneornil(L, narg)) {
if (len)
*len = (def ? strlen(def) : 0);
return def;
}
else return luaL_checklstring(L, narg, len);
}
LUALIB_API lua_Number luaL_checknumber (lua_State *L, int narg) {
lua_Number d = lua_tonumber(L, narg);
if (d == 0 && !lua_isnumber(L, narg)) /* avoid extra test when d is not 0 */
tag_error(L, narg, LUA_TNUMBER);
return d;
}
LUALIB_API lua_Number luaL_optnumber (lua_State *L, int narg, lua_Number def) {
return luaL_opt(L, luaL_checknumber, narg, def);
}
LUALIB_API lua_Integer luaL_checkinteger (lua_State *L, int narg) {
lua_Integer d = lua_tointeger(L, narg);
if (d == 0 && !lua_isnumber(L, narg)) /* avoid extra test when d is not 0 */
tag_error(L, narg, LUA_TNUMBER);
return d;
}
LUALIB_API lua_Integer luaL_optinteger (lua_State *L, int narg,
lua_Integer def) {
return luaL_opt(L, luaL_checkinteger, narg, def);
}
LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *event) {
if (!lua_getmetatable(L, obj)) /* no metatable? */
return 0;
lua_pushstring(L, event);
lua_rawget(L, -2);
if (lua_isnil(L, -1)) {
lua_pop(L, 2); /* remove metatable and metafield */
return 0;
}
else {
lua_remove(L, -2); /* remove only metatable */
return 1;
}
}
LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event) {
obj = abs_index(L, obj);
if (!luaL_getmetafield(L, obj, event)) /* no metafield? */
return 0;
lua_pushvalue(L, obj);
lua_call(L, 1, 1);
return 1;
}
LUALIB_API void (luaL_register) (lua_State *L, const char *libname,
const luaL_Reg *l) {
luaI_openlib(L, libname, l, 0);
}
static int libsize (const luaL_Reg *l) {
int size = 0;
for (; l->name; l++) size++;
return size;
}
LUALIB_API void luaI_openlib (lua_State *L, const char *libname,
const luaL_Reg *l, int nup) {
if (libname) {
int size = libsize(l);
/* check whether lib already exists */
luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 1);
lua_getfield(L, -1, libname); /* get _LOADED[libname] */
if (!lua_istable(L, -1)) { /* not found? */
lua_pop(L, 1); /* remove previous result */
/* try global variable (and create one if it does not exist) */
if (luaL_findtable(L, LUA_GLOBALSINDEX, libname, size) != NULL)
luaL_error(L, "name conflict for module " LUA_QS, libname);
lua_pushvalue(L, -1);
lua_setfield(L, -3, libname); /* _LOADED[libname] = new table */
}
lua_remove(L, -2); /* remove _LOADED table */
lua_insert(L, -(nup+1)); /* move library table to below upvalues */
}
for (; l->name; l++) {
int i;
for (i=0; i<nup; i++) /* copy upvalues to the top */
lua_pushvalue(L, -nup);
lua_pushcclosure(L, l->func, nup);
lua_setfield(L, -(nup+2), l->name);
}
lua_pop(L, nup); /* remove upvalues */
}
/*
** {======================================================
** getn-setn: size for arrays
** =======================================================
*/
#if defined(LUA_COMPAT_GETN)
static int checkint (lua_State *L, int topop) {
int n = (lua_type(L, -1) == LUA_TNUMBER) ? lua_tointeger(L, -1) : -1;
lua_pop(L, topop);
return n;
}
static void getsizes (lua_State *L) {
lua_getfield(L, LUA_REGISTRYINDEX, "LUA_SIZES");
if (lua_isnil(L, -1)) { /* no `size' table? */
lua_pop(L, 1); /* remove nil */
lua_newtable(L); /* create it */
lua_pushvalue(L, -1); /* `size' will be its own metatable */
lua_setmetatable(L, -2);
lua_pushliteral(L, "kv");
lua_setfield(L, -2, "__mode"); /* metatable(N).__mode = "kv" */
lua_pushvalue(L, -1);
lua_setfield(L, LUA_REGISTRYINDEX, "LUA_SIZES"); /* store in register */
}
}
LUALIB_API void luaL_setn (lua_State *L, int t, int n) {
t = abs_index(L, t);
lua_pushliteral(L, "n");
lua_rawget(L, t);
if (checkint(L, 1) >= 0) { /* is there a numeric field `n'? */
lua_pushliteral(L, "n"); /* use it */
lua_pushinteger(L, n);
lua_rawset(L, t);
}
else { /* use `sizes' */
getsizes(L);
lua_pushvalue(L, t);
lua_pushinteger(L, n);
lua_rawset(L, -3); /* sizes[t] = n */
lua_pop(L, 1); /* remove `sizes' */
}
}
LUALIB_API int luaL_getn (lua_State *L, int t) {
int n;
t = abs_index(L, t);
lua_pushliteral(L, "n"); /* try t.n */
lua_rawget(L, t);
if ((n = checkint(L, 1)) >= 0) return n;
getsizes(L); /* else try sizes[t] */
lua_pushvalue(L, t);
lua_rawget(L, -2);
if ((n = checkint(L, 2)) >= 0) return n;
return (int)lua_objlen(L, t);
}
#endif
/* }====================================================== */
LUALIB_API const char *luaL_gsub (lua_State *L, const char *s, const char *p,
const char *r) {
const char *wild;
size_t l = strlen(p);
luaL_Buffer b;
luaL_buffinit(L, &b);
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 */
luaL_pushresult(&b);
return lua_tostring(L, -1);
}
LUALIB_API const char *luaL_findtable (lua_State *L, int idx,
const char *fname, int szhint) {
const char *e;
lua_pushvalue(L, idx);
do {
e = strchr(fname, '.');
if (e == NULL) e = fname + strlen(fname);
lua_pushlstring(L, fname, e - fname);
lua_rawget(L, -2);
if (lua_isnil(L, -1)) { /* no such field? */
lua_pop(L, 1); /* remove this nil */
lua_createtable(L, 0, (*e == '.' ? 1 : szhint)); /* new table for field */
lua_pushlstring(L, fname, e - fname);
lua_pushvalue(L, -2);
lua_settable(L, -4); /* set new table into field */
}
else if (!lua_istable(L, -1)) { /* field has a non-table value? */
lua_pop(L, 2); /* remove table and value */
return fname; /* return problematic part of the name */
}
lua_remove(L, -2); /* remove previous table */
fname = e + 1;
} while (*e == '.');
return NULL;
}
/*
** {======================================================
** Generic Buffer manipulation
** =======================================================
*/
#define bufflen(B) ((B)->p - (B)->buffer)
#define bufffree(B) ((size_t)(LUAL_BUFFERSIZE - bufflen(B)))
#define LIMIT (LUA_MINSTACK/2)
static int emptybuffer (luaL_Buffer *B) {
size_t l = bufflen(B);
if (l == 0) return 0; /* put nothing on stack */
else {
lua_pushlstring(B->L, B->buffer, l);
B->p = B->buffer;
B->lvl++;
return 1;
}
}
static void adjuststack (luaL_Buffer *B) {
if (B->lvl > 1) {
lua_State *L = B->L;
int toget = 1; /* number of levels to concat */
size_t toplen = lua_strlen(L, -1);
do {
size_t l = lua_strlen(L, -(toget+1));
if (B->lvl - toget + 1 >= LIMIT || toplen > l) {
toplen += l;
toget++;
}
else break;
} while (toget < B->lvl);
lua_concat(L, toget);
B->lvl = B->lvl - toget + 1;
}
}
LUALIB_API char *luaL_prepbuffer (luaL_Buffer *B) {
if (emptybuffer(B))
adjuststack(B);
return B->buffer;
}
LUALIB_API void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l) {
while (l--)
luaL_addchar(B, *s++);
}
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) {
emptybuffer(B);
lua_concat(B->L, B->lvl);
B->lvl = 1;
}
LUALIB_API void luaL_addvalue (luaL_Buffer *B) {
lua_State *L = B->L;
size_t vl;
const char *s = lua_tolstring(L, -1, &vl);
if (vl <= bufffree(B)) { /* fit into buffer? */
memcpy(B->p, s, vl); /* put it there */
B->p += vl;
lua_pop(L, 1); /* remove from stack */
}
else {
if (emptybuffer(B))
lua_insert(L, -2); /* put buffer before new value */
B->lvl++; /* add new value into B stack */
adjuststack(B);
}
}
LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B) {
B->L = L;
B->p = B->buffer;
B->lvl = 0;
}
/* }====================================================== */
LUALIB_API int luaL_ref (lua_State *L, int t) {
int ref;
t = abs_index(L, t);
if (lua_isnil(L, -1)) {
lua_pop(L, 1); /* remove from stack */
return LUA_REFNIL; /* `nil' has a unique fixed reference */
}
lua_rawgeti(L, t, FREELIST_REF); /* get first free element */
ref = (int)lua_tointeger(L, -1); /* ref = t[FREELIST_REF] */
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_REF); /* (t[FREELIST_REF] = t[ref]) */
}
else { /* no free elements */
ref = (int)lua_objlen(L, t);
ref++; /* create 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 = abs_index(L, t);
lua_rawgeti(L, t, FREELIST_REF);
lua_rawseti(L, t, ref); /* t[ref] = t[FREELIST_REF] */
lua_pushinteger(L, ref);
lua_rawseti(L, t, FREELIST_REF); /* t[FREELIST_REF] = ref */
}
}
/*
** {======================================================
** Load functions
** =======================================================
*/
typedef struct LoadF {
int extraline;
FILE *f;
char buff[LUAL_BUFFERSIZE];
} LoadF;
static const char *getF (lua_State *L, void *ud, size_t *size) {
LoadF *lf = (LoadF *)ud;
(void)L;
if (lf->extraline) {
lf->extraline = 0;
*size = 1;
return "\n";
}
if (feof(lf->f)) return NULL;
*size = fread(lf->buff, 1, sizeof(lf->buff), lf->f);
return (*size > 0) ? lf->buff : NULL;
}
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;
}
LUALIB_API int luaL_loadfile (lua_State *L, const char *filename) {
LoadF lf;
int status, readstatus;
int c;
int fnameindex = lua_gettop(L) + 1; /* index of filename on the stack */
lf.extraline = 0;
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);
}
c = getc(lf.f);
if (c == '#') { /* Unix exec. file? */
lf.extraline = 1;
while ((c = getc(lf.f)) != EOF && c != '\n') ; /* skip first line */
if (c == '\n') c = getc(lf.f);
}
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);
/* skip eventual `#!...' */
while ((c = getc(lf.f)) != EOF && c != LUA_SIGNATURE[0]) ;
lf.extraline = 0;
}
ungetc(c, lf.f);
status = lua_load(L, getF, &lf, lua_tostring(L, -1));
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;
if (ls->size == 0) return NULL;
*size = ls->size;
ls->size = 0;
return ls->s;
}
LUALIB_API int luaL_loadbuffer (lua_State *L, const char *buff, size_t size,
const char *name) {
LoadS ls;
ls.s = buff;
ls.size = size;
return lua_load(L, getS, &ls, name);
}
LUALIB_API int (luaL_loadstring) (lua_State *L, const char *s) {
return luaL_loadbuffer(L, s, strlen(s), s);
}
/* }====================================================== */
static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {
(void)ud;
(void)osize;
if (nsize == 0) {
free(ptr);
return NULL;
}
else
return realloc(ptr, nsize);
}
static int panic (lua_State *L) {
(void)L; /* to avoid warnings */
fprintf(stderr, "PANIC: unprotected error in call to Lua API (%s)\n",
lua_tostring(L, -1));
return 0;
}
LUALIB_API lua_State *luaL_newstate (void) {
lua_State *L = lua_newstate(l_alloc, NULL);
if (L) lua_atpanic(L, &panic);
return L;
}

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/*
** $Id: lauxlib.h,v 1.88.1.1 2007/12/27 13:02:25 roberto Exp $
** 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"
#if defined(LUA_COMPAT_GETN)
LUALIB_API int (luaL_getn) (lua_State *L, int t);
LUALIB_API void (luaL_setn) (lua_State *L, int t, int n);
#else
#define luaL_getn(L,i) ((int)lua_objlen(L, i))
#define luaL_setn(L,i,j) ((void)0) /* no op! */
#endif
#if defined(LUA_COMPAT_OPENLIB)
#define luaI_openlib luaL_openlib
#endif
/* extra error code for `luaL_load' */
#define LUA_ERRFILE (LUA_ERRERR+1)
typedef struct luaL_Reg {
const char *name;
lua_CFunction func;
} luaL_Reg;
LUALIB_API void (luaI_openlib) (lua_State *L, const char *libname,
const luaL_Reg *l, int nup);
LUALIB_API void (luaL_register) (lua_State *L, const char *libname,
const luaL_Reg *l);
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 int (luaL_typerror) (lua_State *L, int narg, const char *tname);
LUALIB_API int (luaL_argerror) (lua_State *L, int numarg, const char *extramsg);
LUALIB_API const char *(luaL_checklstring) (lua_State *L, int numArg,
size_t *l);
LUALIB_API const char *(luaL_optlstring) (lua_State *L, int numArg,
const char *def, size_t *l);
LUALIB_API lua_Number (luaL_checknumber) (lua_State *L, int numArg);
LUALIB_API lua_Number (luaL_optnumber) (lua_State *L, int nArg, lua_Number def);
LUALIB_API lua_Integer (luaL_checkinteger) (lua_State *L, int numArg);
LUALIB_API lua_Integer (luaL_optinteger) (lua_State *L, int nArg,
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 narg, int t);
LUALIB_API void (luaL_checkany) (lua_State *L, int narg);
LUALIB_API int (luaL_newmetatable) (lua_State *L, 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 narg, const char *def,
const char *const lst[]);
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_loadfile) (lua_State *L, const char *filename);
LUALIB_API int (luaL_loadbuffer) (lua_State *L, const char *buff, size_t sz,
const char *name);
LUALIB_API int (luaL_loadstring) (lua_State *L, const char *s);
LUALIB_API lua_State *(luaL_newstate) (void);
LUALIB_API const char *(luaL_gsub) (lua_State *L, const char *s, const char *p,
const char *r);
LUALIB_API const char *(luaL_findtable) (lua_State *L, int idx,
const char *fname, int szhint);
/*
** ===============================================================
** some useful macros
** ===============================================================
*/
#define luaL_argcheck(L, cond,numarg,extramsg) \
((void)((cond) || luaL_argerror(L, (numarg), (extramsg))))
#define luaL_checkstring(L,n) (luaL_checklstring(L, (n), NULL))
#define luaL_optstring(L,n,d) (luaL_optlstring(L, (n), (d), NULL))
#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)))
#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)))
/*
** {======================================================
** Generic Buffer manipulation
** =======================================================
*/
typedef struct luaL_Buffer {
char *p; /* current position in buffer */
int lvl; /* number of strings in the stack (level) */
lua_State *L;
char buffer[LUAL_BUFFERSIZE];
} luaL_Buffer;
#define luaL_addchar(B,c) \
((void)((B)->p < ((B)->buffer+LUAL_BUFFERSIZE) || luaL_prepbuffer(B)), \
(*(B)->p++ = (char)(c)))
/* compatibility only */
#define luaL_putchar(B,c) luaL_addchar(B,c)
#define luaL_addsize(B,n) ((B)->p += (n))
LUALIB_API void (luaL_buffinit) (lua_State *L, luaL_Buffer *B);
LUALIB_API char *(luaL_prepbuffer) (luaL_Buffer *B);
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);
/* }====================================================== */
/* compatibility with ref system */
/* pre-defined references */
#define LUA_NOREF (-2)
#define LUA_REFNIL (-1)
#define lua_ref(L,lock) ((lock) ? luaL_ref(L, LUA_REGISTRYINDEX) : \
(lua_pushstring(L, "unlocked references are obsolete"), lua_error(L), 0))
#define lua_unref(L,ref) luaL_unref(L, LUA_REGISTRYINDEX, (ref))
#define lua_getref(L,ref) lua_rawgeti(L, LUA_REGISTRYINDEX, (ref))
#define luaL_reg luaL_Reg
#endif

653
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/*
** $Id: lbaselib.c,v 1.191.1.6 2008/02/14 16:46:22 roberto Exp $
** Basic library
** See Copyright Notice in lua.h
*/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define lbaselib_c
#define LUA_LIB
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
/*
** If your system does not support `stdout', you can just remove this function.
** If you need, you can define your own `print' function, following this
** model but changing `fputs' to put the strings at a proper place
** (a console window or a log file, for instance).
*/
static int luaB_print (lua_State *L) {
int n = lua_gettop(L); /* number of arguments */
int i;
lua_getglobal(L, "tostring");
for (i=1; i<=n; i++) {
const char *s;
lua_pushvalue(L, -1); /* function to be called */
lua_pushvalue(L, i); /* value to print */
lua_call(L, 1, 1);
s = lua_tostring(L, -1); /* get result */
if (s == NULL)
return luaL_error(L, LUA_QL("tostring") " must return a string to "
LUA_QL("print"));
if (i>1) fputs("\t", stdout);
fputs(s, stdout);
lua_pop(L, 1); /* pop result */
}
fputs("\n", stdout);
return 0;
}
static int luaB_tonumber (lua_State *L) {
int base = luaL_optint(L, 2, 10);
if (base == 10) { /* standard conversion */
luaL_checkany(L, 1);
if (lua_isnumber(L, 1)) {
lua_pushnumber(L, lua_tonumber(L, 1));
return 1;
}
}
else {
const char *s1 = luaL_checkstring(L, 1);
char *s2;
unsigned long n;
luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");
n = strtoul(s1, &s2, base);
if (s1 != s2) { /* at least one valid digit? */
while (isspace((unsigned char)(*s2))) s2++; /* skip trailing spaces */
if (*s2 == '\0') { /* no invalid trailing characters? */
lua_pushnumber(L, (lua_Number)n);
return 1;
}
}
}
lua_pushnil(L); /* else not a number */
return 1;
}
static int luaB_error (lua_State *L) {
int level = luaL_optint(L, 2, 1);
lua_settop(L, 1);
if (lua_isstring(L, 1) && level > 0) { /* add extra information? */
luaL_where(L, level);
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_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
"nil or table expected");
if (luaL_getmetafield(L, 1, "__metatable"))
luaL_error(L, "cannot change a protected metatable");
lua_settop(L, 2);
lua_setmetatable(L, 1);
return 1;
}
static void getfunc (lua_State *L, int opt) {
if (lua_isfunction(L, 1)) lua_pushvalue(L, 1);
else {
lua_Debug ar;
int level = opt ? luaL_optint(L, 1, 1) : luaL_checkint(L, 1);
luaL_argcheck(L, level >= 0, 1, "level must be non-negative");
if (lua_getstack(L, level, &ar) == 0)
luaL_argerror(L, 1, "invalid level");
lua_getinfo(L, "f", &ar);
if (lua_isnil(L, -1))
luaL_error(L, "no function environment for tail call at level %d",
level);
}
}
static int luaB_getfenv (lua_State *L) {
getfunc(L, 1);
if (lua_iscfunction(L, -1)) /* is a C function? */
lua_pushvalue(L, LUA_GLOBALSINDEX); /* return the thread's global env. */
else
lua_getfenv(L, -1);
return 1;
}
static int luaB_setfenv (lua_State *L) {
luaL_checktype(L, 2, LUA_TTABLE);
getfunc(L, 0);
lua_pushvalue(L, 2);
if (lua_isnumber(L, 1) && lua_tonumber(L, 1) == 0) {
/* change environment of current thread */
lua_pushthread(L);
lua_insert(L, -2);
lua_setfenv(L, -2);
return 0;
}
else if (lua_iscfunction(L, -2) || lua_setfenv(L, -2) == 0)
luaL_error(L,
LUA_QL("setfenv") " cannot change environment of given object");
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_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 luaB_gcinfo (lua_State *L) {
lua_pushinteger(L, lua_getgccount(L));
return 1;
}
static int luaB_collectgarbage (lua_State *L) {
static const char *const opts[] = {"stop", "restart", "collect",
"count", "step", "setpause", "setstepmul", NULL};
static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT,
LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL};
int o = luaL_checkoption(L, 1, "collect", opts);
int ex = luaL_optint(L, 2, 0);
int res = lua_gc(L, optsnum[o], ex);
switch (optsnum[o]) {
case LUA_GCCOUNT: {
int b = lua_gc(L, LUA_GCCOUNTB, 0);
lua_pushnumber(L, res + ((lua_Number)b/1024));
return 1;
}
case LUA_GCSTEP: {
lua_pushboolean(L, res);
return 1;
}
default: {
lua_pushnumber(L, res);
return 1;
}
}
}
static int luaB_type (lua_State *L) {
luaL_checkany(L, 1);
lua_pushstring(L, luaL_typename(L, 1));
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_checktype(L, 1, LUA_TTABLE);
lua_pushvalue(L, lua_upvalueindex(1)); /* return generator, */
lua_pushvalue(L, 1); /* state, */
lua_pushnil(L); /* and initial value */
return 3;
}
static int ipairsaux (lua_State *L) {
int i = luaL_checkint(L, 2);
luaL_checktype(L, 1, LUA_TTABLE);
i++; /* next value */
lua_pushinteger(L, i);
lua_rawgeti(L, 1, i);
return (lua_isnil(L, -1)) ? 0 : 2;
}
static int luaB_ipairs (lua_State *L) {
luaL_checktype(L, 1, LUA_TTABLE);
lua_pushvalue(L, lua_upvalueindex(1)); /* return generator, */
lua_pushvalue(L, 1); /* state, */
lua_pushinteger(L, 0); /* and initial value */
return 3;
}
static int load_aux (lua_State *L, int status) {
if (status == 0) /* OK? */
return 1;
else {
lua_pushnil(L);
lua_insert(L, -2); /* put before error message */
return 2; /* return nil plus error message */
}
}
static int luaB_loadstring (lua_State *L) {
size_t l;
const char *s = luaL_checklstring(L, 1, &l);
const char *chunkname = luaL_optstring(L, 2, s);
return load_aux(L, luaL_loadbuffer(L, s, l, chunkname));
}
static int luaB_loadfile (lua_State *L) {
const char *fname = luaL_optstring(L, 1, NULL);
return load_aux(L, luaL_loadfile(L, fname));
}
/*
** 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; /* to avoid warnings */
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)) {
*size = 0;
return NULL;
}
else if (lua_isstring(L, -1)) {
lua_replace(L, 3); /* save string in a reserved stack slot */
return lua_tolstring(L, 3, size);
}
else luaL_error(L, "reader function must return a string");
return NULL; /* to avoid warnings */
}
static int luaB_load (lua_State *L) {
int status;
const char *cname = luaL_optstring(L, 2, "=(load)");
luaL_checktype(L, 1, LUA_TFUNCTION);
lua_settop(L, 3); /* function, eventual name, plus one reserved slot */
status = lua_load(L, generic_reader, NULL, cname);
return load_aux(L, status);
}
static int luaB_dofile (lua_State *L) {
const char *fname = luaL_optstring(L, 1, NULL);
int n = lua_gettop(L);
if (luaL_loadfile(L, fname) != 0) lua_error(L);
lua_call(L, 0, LUA_MULTRET);
return lua_gettop(L) - n;
}
static int luaB_assert (lua_State *L) {
luaL_checkany(L, 1);
if (!lua_toboolean(L, 1))
return luaL_error(L, "%s", luaL_optstring(L, 2, "assertion failed!"));
return lua_gettop(L);
}
static int luaB_unpack (lua_State *L) {
int i, e, n;
luaL_checktype(L, 1, LUA_TTABLE);
i = luaL_optint(L, 2, 1);
e = luaL_opt(L, luaL_checkint, 3, luaL_getn(L, 1));
if (i > e) return 0; /* empty range */
n = e - i + 1; /* number of elements */
if (n <= 0 || !lua_checkstack(L, n)) /* n <= 0 means arith. overflow */
return luaL_error(L, "too many results to unpack");
lua_rawgeti(L, 1, i); /* push arg[i] (avoiding overflow problems) */
while (i++ < e) /* push arg[i + 1...e] */
lua_rawgeti(L, 1, i);
return n;
}
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 {
int i = luaL_checkint(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 - i;
}
}
static int luaB_pcall (lua_State *L) {
int status;
luaL_checkany(L, 1);
status = lua_pcall(L, lua_gettop(L) - 1, LUA_MULTRET, 0);
lua_pushboolean(L, (status == 0));
lua_insert(L, 1);
return lua_gettop(L); /* return status + all results */
}
static int luaB_xpcall (lua_State *L) {
int status;
luaL_checkany(L, 2);
lua_settop(L, 2);
lua_insert(L, 1); /* put error function under function to be called */
status = lua_pcall(L, 0, LUA_MULTRET, 1);
lua_pushboolean(L, (status == 0));
lua_replace(L, 1);
return lua_gettop(L); /* return status + all results */
}
static int luaB_tostring (lua_State *L) {
luaL_checkany(L, 1);
if (luaL_callmeta(L, 1, "__tostring")) /* is there a metafield? */
return 1; /* use its value */
switch (lua_type(L, 1)) {
case LUA_TNUMBER:
lua_pushstring(L, lua_tostring(L, 1));
break;
case LUA_TSTRING:
lua_pushvalue(L, 1);
break;
case LUA_TBOOLEAN:
lua_pushstring(L, (lua_toboolean(L, 1) ? "true" : "false"));
break;
case LUA_TNIL:
lua_pushliteral(L, "nil");
break;
default:
lua_pushfstring(L, "%s: %p", luaL_typename(L, 1), lua_topointer(L, 1));
break;
}
return 1;
}
static int luaB_newproxy (lua_State *L) {
lua_settop(L, 1);
lua_newuserdata(L, 0); /* create proxy */
if (lua_toboolean(L, 1) == 0)
return 1; /* no metatable */
else if (lua_isboolean(L, 1)) {
lua_newtable(L); /* create a new metatable `m' ... */
lua_pushvalue(L, -1); /* ... and mark `m' as a valid metatable */
lua_pushboolean(L, 1);
lua_rawset(L, lua_upvalueindex(1)); /* weaktable[m] = true */
}
else {
int validproxy = 0; /* to check if weaktable[metatable(u)] == true */
if (lua_getmetatable(L, 1)) {
lua_rawget(L, lua_upvalueindex(1));
validproxy = lua_toboolean(L, -1);
lua_pop(L, 1); /* remove value */
}
luaL_argcheck(L, validproxy, 1, "boolean or proxy expected");
lua_getmetatable(L, 1); /* metatable is valid; get it */
}
lua_setmetatable(L, 2);
return 1;
}
static const luaL_Reg base_funcs[] = {
{"assert", luaB_assert},
{"collectgarbage", luaB_collectgarbage},
{"dofile", luaB_dofile},
{"error", luaB_error},
{"gcinfo", luaB_gcinfo},
{"getfenv", luaB_getfenv},
{"getmetatable", luaB_getmetatable},
{"loadfile", luaB_loadfile},
{"load", luaB_load},
{"loadstring", luaB_loadstring},
{"next", luaB_next},
{"pcall", luaB_pcall},
{"print", luaB_print},
{"rawequal", luaB_rawequal},
{"rawget", luaB_rawget},
{"rawset", luaB_rawset},
{"select", luaB_select},
{"setfenv", luaB_setfenv},
{"setmetatable", luaB_setmetatable},
{"tonumber", luaB_tonumber},
{"tostring", luaB_tostring},
{"type", luaB_type},
{"unpack", luaB_unpack},
{"xpcall", luaB_xpcall},
{NULL, NULL}
};
/*
** {======================================================
** Coroutine library
** =======================================================
*/
#define CO_RUN 0 /* running */
#define CO_SUS 1 /* suspended */
#define CO_NOR 2 /* 'normal' (it resumed another coroutine) */
#define CO_DEAD 3
static const char *const statnames[] =
{"running", "suspended", "normal", "dead"};
static int costatus (lua_State *L, lua_State *co) {
if (L == co) return CO_RUN;
switch (lua_status(co)) {
case LUA_YIELD:
return CO_SUS;
case 0: {
lua_Debug ar;
if (lua_getstack(co, 0, &ar) > 0) /* does it have frames? */
return CO_NOR; /* it is running */
else if (lua_gettop(co) == 0)
return CO_DEAD;
else
return CO_SUS; /* initial state */
}
default: /* some error occured */
return CO_DEAD;
}
}
static int luaB_costatus (lua_State *L) {
lua_State *co = lua_tothread(L, 1);
luaL_argcheck(L, co, 1, "coroutine expected");
lua_pushstring(L, statnames[costatus(L, co)]);
return 1;
}
static int auxresume (lua_State *L, lua_State *co, int narg) {
int status = costatus(L, co);
if (!lua_checkstack(co, narg))
luaL_error(L, "too many arguments to resume");
if (status != CO_SUS) {
lua_pushfstring(L, "cannot resume %s coroutine", statnames[status]);
return -1; /* error flag */
}
lua_xmove(L, co, narg);
lua_setlevel(L, co);
status = lua_resume(co, narg);
if (status == 0 || status == LUA_YIELD) {
int nres = lua_gettop(co);
if (!lua_checkstack(L, nres + 1))
luaL_error(L, "too many results to resume");
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 = lua_tothread(L, 1);
int r;
luaL_argcheck(L, co, 1, "coroutine expected");
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) {
if (lua_isstring(L, -1)) { /* error object is a string? */
luaL_where(L, 1); /* add extra info */
lua_insert(L, -2);
lua_concat(L, 2);
}
lua_error(L); /* propagate error */
}
return r;
}
static int luaB_cocreate (lua_State *L) {
lua_State *NL = lua_newthread(L);
luaL_argcheck(L, lua_isfunction(L, 1) && !lua_iscfunction(L, 1), 1,
"Lua function expected");
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));
}
static int luaB_corunning (lua_State *L) {
if (lua_pushthread(L))
lua_pushnil(L); /* main thread is not a coroutine */
return 1;
}
static const luaL_Reg co_funcs[] = {
{"create", luaB_cocreate},
{"resume", luaB_coresume},
{"running", luaB_corunning},
{"status", luaB_costatus},
{"wrap", luaB_cowrap},
{"yield", luaB_yield},
{NULL, NULL}
};
/* }====================================================== */
static void auxopen (lua_State *L, const char *name,
lua_CFunction f, lua_CFunction u) {
lua_pushcfunction(L, u);
lua_pushcclosure(L, f, 1);
lua_setfield(L, -2, name);
}
static void base_open (lua_State *L) {
/* set global _G */
lua_pushvalue(L, LUA_GLOBALSINDEX);
lua_setglobal(L, "_G");
/* open lib into global table */
luaL_register(L, "_G", base_funcs);
lua_pushliteral(L, LUA_VERSION);
lua_setglobal(L, "_VERSION"); /* set global _VERSION */
/* `ipairs' and `pairs' need auxiliary functions as upvalues */
auxopen(L, "ipairs", luaB_ipairs, ipairsaux);
auxopen(L, "pairs", luaB_pairs, luaB_next);
/* `newproxy' needs a weaktable as upvalue */
lua_createtable(L, 0, 1); /* new table `w' */
lua_pushvalue(L, -1); /* `w' will be its own metatable */
lua_setmetatable(L, -2);
lua_pushliteral(L, "kv");
lua_setfield(L, -2, "__mode"); /* metatable(w).__mode = "kv" */
lua_pushcclosure(L, luaB_newproxy, 1);
lua_setglobal(L, "newproxy"); /* set global `newproxy' */
}
LUALIB_API int luaopen_base (lua_State *L) {
base_open(L);
luaL_register(L, LUA_COLIBNAME, co_funcs);
return 2;
}

831
src/lcode.c Normal file
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@ -0,0 +1,831 @@
/*
** $Id: lcode.c,v 2.25.1.5 2011/01/31 14:53:16 roberto Exp $
** Code generator for Lua
** See Copyright Notice in lua.h
*/
#include <stdlib.h>
#define lcode_c
#define LUA_CORE
#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 "ltable.h"
#define hasjumps(e) ((e)->t != (e)->f)
static int isnumeral(expdesc *e) {
return (e->k == VKNUM && e->t == NO_JUMP && e->f == NO_JUMP);
}
void luaK_nil (FuncState *fs, int from, int n) {
Instruction *previous;
if (fs->pc > fs->lasttarget) { /* no jumps to current position? */
if (fs->pc == 0) { /* function start? */
if (from >= fs->nactvar)
return; /* positions are already clean */
}
else {
previous = &fs->f->code[fs->pc-1];
if (GET_OPCODE(*previous) == OP_LOADNIL) {
int pfrom = GETARG_A(*previous);
int pto = GETARG_B(*previous);
if (pfrom <= from && from <= pto+1) { /* can connect both? */
if (from+n-1 > pto)
SETARG_B(*previous, from+n-1);
return;
}
}
}
}
luaK_codeABC(fs, OP_LOADNIL, from, from+n-1, 0); /* else no optimization */
}
int luaK_jump (FuncState *fs) {
int jpc = fs->jpc; /* save list of jumps to here */
int j;
fs->jpc = NO_JUMP;
j = luaK_codeAsBx(fs, OP_JMP, 0, NO_JUMP);
luaK_concat(fs, &j, jpc); /* keep them on hold */
return j;
}
void luaK_ret (FuncState *fs, int first, int nret) {
luaK_codeABC(fs, OP_RETURN, first, nret+1, 0);
}
static int condjump (FuncState *fs, OpCode op, int A, int B, int C) {
luaK_codeABC(fs, op, A, B, C);
return luaK_jump(fs);
}
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 (abs(offset) > MAXARG_sBx)
luaX_syntaxerror(fs->ls, "control structure too long");
SETARG_sBx(*jmp, offset);
}
/*
** 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;
}
static int getjump (FuncState *fs, int pc) {
int offset = GETARG_sBx(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 */
}
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;
}
/*
** 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 */
}
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 */
*i = CREATE_ABC(OP_TEST, GETARG_B(*i), 0, GETARG_C(*i));
return 1;
}
static void removevalues (FuncState *fs, int list) {
for (; list != NO_JUMP; list = getjump(fs, list))
patchtestreg(fs, list, NO_REG);
}
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;
}
}
static void dischargejpc (FuncState *fs) {
patchlistaux(fs, fs->jpc, fs->pc, NO_REG, fs->pc);
fs->jpc = NO_JUMP;
}
void luaK_patchlist (FuncState *fs, int list, int target) {
if (target == fs->pc)
luaK_patchtohere(fs, list);
else {
lua_assert(target < fs->pc);
patchlistaux(fs, list, target, NO_REG, target);
}
}
void luaK_patchtohere (FuncState *fs, int list) {
luaK_getlabel(fs);
luaK_concat(fs, &fs->jpc, list);
}
void luaK_concat (FuncState *fs, int *l1, int l2) {
if (l2 == NO_JUMP) return;
else if (*l1 == NO_JUMP)
*l1 = l2;
else {
int list = *l1;
int next;
while ((next = getjump(fs, list)) != NO_JUMP) /* find last element */
list = next;
fixjump(fs, list, l2);
}
}
void luaK_checkstack (FuncState *fs, int n) {
int newstack = fs->freereg + n;
if (newstack > fs->f->maxstacksize) {
if (newstack >= MAXSTACK)
luaX_syntaxerror(fs->ls, "function or expression too complex");
fs->f->maxstacksize = cast_byte(newstack);
}
}
void luaK_reserveregs (FuncState *fs, int n) {
luaK_checkstack(fs, n);
fs->freereg += n;
}
static void freereg (FuncState *fs, int reg) {
if (!ISK(reg) && reg >= fs->nactvar) {
fs->freereg--;
lua_assert(reg == fs->freereg);
}
}
static void freeexp (FuncState *fs, expdesc *e) {
if (e->k == VNONRELOC)
freereg(fs, e->u.s.info);
}
static int addk (FuncState *fs, TValue *k, TValue *v) {
lua_State *L = fs->L;
TValue *idx = luaH_set(L, fs->h, k);
Proto *f = fs->f;
int oldsize = f->sizek;
if (ttisnumber(idx)) {
lua_assert(luaO_rawequalObj(&fs->f->k[cast_int(nvalue(idx))], v));
return cast_int(nvalue(idx));
}
else { /* constant not found; create a new entry */
setnvalue(idx, cast_num(fs->nk));
luaM_growvector(L, f->k, fs->nk, f->sizek, TValue,
MAXARG_Bx, "constant table overflow");
while (oldsize < f->sizek) setnilvalue(&f->k[oldsize++]);
setobj(L, &f->k[fs->nk], v);
luaC_barrier(L, f, v);
return fs->nk++;
}
}
int luaK_stringK (FuncState *fs, TString *s) {
TValue o;
setsvalue(fs->L, &o, s);
return addk(fs, &o, &o);
}
int luaK_numberK (FuncState *fs, lua_Number r) {
TValue o;
setnvalue(&o, r);
return addk(fs, &o, &o);
}
static int boolK (FuncState *fs, int b) {
TValue o;
setbvalue(&o, b);
return addk(fs, &o, &o);
}
static int nilK (FuncState *fs) {
TValue k, v;
setnilvalue(&v);
/* cannot use nil as key; instead use table itself to represent nil */
sethvalue(fs->L, &k, fs->h);
return addk(fs, &k, &v);
}
void luaK_setreturns (FuncState *fs, expdesc *e, int nresults) {
if (e->k == VCALL) { /* expression is an open function call? */
SETARG_C(getcode(fs, e), nresults+1);
}
else if (e->k == VVARARG) {
SETARG_B(getcode(fs, e), nresults+1);
SETARG_A(getcode(fs, e), fs->freereg);
luaK_reserveregs(fs, 1);
}
}
void luaK_setoneret (FuncState *fs, expdesc *e) {
if (e->k == VCALL) { /* expression is an open function call? */
e->k = VNONRELOC;
e->u.s.info = GETARG_A(getcode(fs, e));
}
else if (e->k == VVARARG) {
SETARG_B(getcode(fs, e), 2);
e->k = VRELOCABLE; /* can relocate its simple result */
}
}
void luaK_dischargevars (FuncState *fs, expdesc *e) {
switch (e->k) {
case VLOCAL: {
e->k = VNONRELOC;
break;
}
case VUPVAL: {
e->u.s.info = luaK_codeABC(fs, OP_GETUPVAL, 0, e->u.s.info, 0);
e->k = VRELOCABLE;
break;
}
case VGLOBAL: {
e->u.s.info = luaK_codeABx(fs, OP_GETGLOBAL, 0, e->u.s.info);
e->k = VRELOCABLE;
break;
}
case VINDEXED: {
freereg(fs, e->u.s.aux);
freereg(fs, e->u.s.info);
e->u.s.info = luaK_codeABC(fs, OP_GETTABLE, 0, e->u.s.info, e->u.s.aux);
e->k = VRELOCABLE;
break;
}
case VVARARG:
case VCALL: {
luaK_setoneret(fs, e);
break;
}
default: break; /* there is one value available (somewhere) */
}
}
static int code_label (FuncState *fs, int A, int b, int jump) {
luaK_getlabel(fs); /* those instructions may be jump targets */
return luaK_codeABC(fs, OP_LOADBOOL, A, b, jump);
}
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: case VTRUE: {
luaK_codeABC(fs, OP_LOADBOOL, reg, e->k == VTRUE, 0);
break;
}
case VK: {
luaK_codeABx(fs, OP_LOADK, reg, e->u.s.info);
break;
}
case VKNUM: {
luaK_codeABx(fs, OP_LOADK, reg, luaK_numberK(fs, e->u.nval));
break;
}
case VRELOCABLE: {
Instruction *pc = &getcode(fs, e);
SETARG_A(*pc, reg);
break;
}
case VNONRELOC: {
if (reg != e->u.s.info)
luaK_codeABC(fs, OP_MOVE, reg, e->u.s.info, 0);
break;
}
default: {
lua_assert(e->k == VVOID || e->k == VJMP);
return; /* nothing to do... */
}
}
e->u.s.info = reg;
e->k = VNONRELOC;
}
static void discharge2anyreg (FuncState *fs, expdesc *e) {
if (e->k != VNONRELOC) {
luaK_reserveregs(fs, 1);
discharge2reg(fs, e, fs->freereg-1);
}
}
static void exp2reg (FuncState *fs, expdesc *e, int reg) {
discharge2reg(fs, e, reg);
if (e->k == VJMP)
luaK_concat(fs, &e->t, e->u.s.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_label(fs, reg, 0, 1);
p_t = code_label(fs, reg, 1, 0);
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.s.info = reg;
e->k = VNONRELOC;
}
void luaK_exp2nextreg (FuncState *fs, expdesc *e) {
luaK_dischargevars(fs, e);
freeexp(fs, e);
luaK_reserveregs(fs, 1);
exp2reg(fs, e, fs->freereg - 1);
}
int luaK_exp2anyreg (FuncState *fs, expdesc *e) {
luaK_dischargevars(fs, e);
if (e->k == VNONRELOC) {
if (!hasjumps(e)) return e->u.s.info; /* exp is already in a register */
if (e->u.s.info >= fs->nactvar) { /* reg. is not a local? */
exp2reg(fs, e, e->u.s.info); /* put value on it */
return e->u.s.info;
}
}
luaK_exp2nextreg(fs, e); /* default */
return e->u.s.info;
}
void luaK_exp2val (FuncState *fs, expdesc *e) {
if (hasjumps(e))
luaK_exp2anyreg(fs, e);
else
luaK_dischargevars(fs, e);
}
int luaK_exp2RK (FuncState *fs, expdesc *e) {
luaK_exp2val(fs, e);
switch (e->k) {
case VKNUM:
case VTRUE:
case VFALSE:
case VNIL: {
if (fs->nk <= MAXINDEXRK) { /* constant fit in RK operand? */
e->u.s.info = (e->k == VNIL) ? nilK(fs) :
(e->k == VKNUM) ? luaK_numberK(fs, e->u.nval) :
boolK(fs, (e->k == VTRUE));
e->k = VK;
return RKASK(e->u.s.info);
}
else break;
}
case VK: {
if (e->u.s.info <= MAXINDEXRK) /* constant fit in argC? */
return RKASK(e->u.s.info);
else break;
}
default: break;
}
/* not a constant in the right range: put it in a register */
return luaK_exp2anyreg(fs, e);
}
void luaK_storevar (FuncState *fs, expdesc *var, expdesc *ex) {
switch (var->k) {
case VLOCAL: {
freeexp(fs, ex);
exp2reg(fs, ex, var->u.s.info);
return;
}
case VUPVAL: {
int e = luaK_exp2anyreg(fs, ex);
luaK_codeABC(fs, OP_SETUPVAL, e, var->u.s.info, 0);
break;
}
case VGLOBAL: {
int e = luaK_exp2anyreg(fs, ex);
luaK_codeABx(fs, OP_SETGLOBAL, e, var->u.s.info);
break;
}
case VINDEXED: {
int e = luaK_exp2RK(fs, ex);
luaK_codeABC(fs, OP_SETTABLE, var->u.s.info, var->u.s.aux, e);
break;
}
default: {
lua_assert(0); /* invalid var kind to store */
break;
}
}
freeexp(fs, ex);
}
void luaK_self (FuncState *fs, expdesc *e, expdesc *key) {
int func;
luaK_exp2anyreg(fs, e);
freeexp(fs, e);
func = fs->freereg;
luaK_reserveregs(fs, 2);
luaK_codeABC(fs, OP_SELF, func, e->u.s.info, luaK_exp2RK(fs, key));
freeexp(fs, key);
e->u.s.info = func;
e->k = VNONRELOC;
}
static void invertjump (FuncState *fs, expdesc *e) {
Instruction *pc = getjumpcontrol(fs, e->u.s.info);
lua_assert(testTMode(GET_OPCODE(*pc)) && GET_OPCODE(*pc) != OP_TESTSET &&
GET_OPCODE(*pc) != OP_TEST);
SETARG_A(*pc, !(GETARG_A(*pc)));
}
static int jumponcond (FuncState *fs, expdesc *e, int cond) {
if (e->k == VRELOCABLE) {
Instruction ie = getcode(fs, e);
if (GET_OPCODE(ie) == OP_NOT) {
fs->pc--; /* remove previous OP_NOT */
return condjump(fs, OP_TEST, GETARG_B(ie), 0, !cond);
}
/* else go through */
}
discharge2anyreg(fs, e);
freeexp(fs, e);
return condjump(fs, OP_TESTSET, NO_REG, e->u.s.info, cond);
}
void luaK_goiftrue (FuncState *fs, expdesc *e) {
int pc; /* pc of last jump */
luaK_dischargevars(fs, e);
switch (e->k) {
case VK: case VKNUM: case VTRUE: {
pc = NO_JUMP; /* always true; do nothing */
break;
}
case VJMP: {
invertjump(fs, e);
pc = e->u.s.info;
break;
}
default: {
pc = jumponcond(fs, e, 0);
break;
}
}
luaK_concat(fs, &e->f, pc); /* insert last jump in `f' list */
luaK_patchtohere(fs, e->t);
e->t = NO_JUMP;
}
static void luaK_goiffalse (FuncState *fs, expdesc *e) {
int pc; /* pc of last jump */
luaK_dischargevars(fs, e);
switch (e->k) {
case VNIL: case VFALSE: {
pc = NO_JUMP; /* always false; do nothing */
break;
}
case VJMP: {
pc = e->u.s.info;
break;
}
default: {
pc = jumponcond(fs, e, 1);
break;
}
}
luaK_concat(fs, &e->t, pc); /* insert last jump in `t' list */
luaK_patchtohere(fs, e->f);
e->f = NO_JUMP;
}
static void codenot (FuncState *fs, expdesc *e) {
luaK_dischargevars(fs, e);
switch (e->k) {
case VNIL: case VFALSE: {
e->k = VTRUE;
break;
}
case VK: case VKNUM: case VTRUE: {
e->k = VFALSE;
break;
}
case VJMP: {
invertjump(fs, e);
break;
}
case VRELOCABLE:
case VNONRELOC: {
discharge2anyreg(fs, e);
freeexp(fs, e);
e->u.s.info = luaK_codeABC(fs, OP_NOT, 0, e->u.s.info, 0);
e->k = VRELOCABLE;
break;
}
default: {
lua_assert(0); /* cannot happen */
break;
}
}
/* interchange true and false lists */
{ int temp = e->f; e->f = e->t; e->t = temp; }
removevalues(fs, e->f);
removevalues(fs, e->t);
}
void luaK_indexed (FuncState *fs, expdesc *t, expdesc *k) {
t->u.s.aux = luaK_exp2RK(fs, k);
t->k = VINDEXED;
}
static int constfolding (OpCode op, expdesc *e1, expdesc *e2) {
lua_Number v1, v2, r;
if (!isnumeral(e1) || !isnumeral(e2)) return 0;
v1 = e1->u.nval;
v2 = e2->u.nval;
switch (op) {
case OP_ADD: r = luai_numadd(v1, v2); break;
case OP_SUB: r = luai_numsub(v1, v2); break;
case OP_MUL: r = luai_nummul(v1, v2); break;
case OP_DIV:
if (v2 == 0) return 0; /* do not attempt to divide by 0 */
r = luai_numdiv(v1, v2); break;
case OP_MOD:
if (v2 == 0) return 0; /* do not attempt to divide by 0 */
r = luai_nummod(v1, v2); break;
case OP_POW: r = luai_numpow(v1, v2); break;
case OP_UNM: r = luai_numunm(v1); break;
case OP_LEN: return 0; /* no constant folding for 'len' */
default: lua_assert(0); r = 0; break;
}
if (luai_numisnan(r)) return 0; /* do not attempt to produce NaN */
e1->u.nval = r;
return 1;
}
static void codearith (FuncState *fs, OpCode op, expdesc *e1, expdesc *e2) {
if (constfolding(op, e1, e2))
return;
else {
int o2 = (op != OP_UNM && op != OP_LEN) ? luaK_exp2RK(fs, e2) : 0;
int o1 = luaK_exp2RK(fs, e1);
if (o1 > o2) {
freeexp(fs, e1);
freeexp(fs, e2);
}
else {
freeexp(fs, e2);
freeexp(fs, e1);
}
e1->u.s.info = luaK_codeABC(fs, op, 0, o1, o2);
e1->k = VRELOCABLE;
}
}
static void codecomp (FuncState *fs, OpCode op, int cond, expdesc *e1,
expdesc *e2) {
int o1 = luaK_exp2RK(fs, e1);
int o2 = luaK_exp2RK(fs, e2);
freeexp(fs, e2);
freeexp(fs, e1);
if (cond == 0 && op != OP_EQ) {
int temp; /* exchange args to replace by `<' or `<=' */
temp = o1; o1 = o2; o2 = temp; /* o1 <==> o2 */
cond = 1;
}
e1->u.s.info = condjump(fs, op, cond, o1, o2);
e1->k = VJMP;
}
void luaK_prefix (FuncState *fs, UnOpr op, expdesc *e) {
expdesc e2;
e2.t = e2.f = NO_JUMP; e2.k = VKNUM; e2.u.nval = 0;
switch (op) {
case OPR_MINUS: {
if (!isnumeral(e))
luaK_exp2anyreg(fs, e); /* cannot operate on non-numeric constants */
codearith(fs, OP_UNM, e, &e2);
break;
}
case OPR_NOT: codenot(fs, e); break;
case OPR_LEN: {
luaK_exp2anyreg(fs, e); /* cannot operate on constants */
codearith(fs, OP_LEN, e, &e2);
break;
}
default: lua_assert(0);
}
}
void luaK_infix (FuncState *fs, BinOpr op, expdesc *v) {
switch (op) {
case OPR_AND: {
luaK_goiftrue(fs, v);
break;
}
case OPR_OR: {
luaK_goiffalse(fs, v);
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_MOD: case OPR_POW: {
if (!isnumeral(v)) luaK_exp2RK(fs, v);
break;
}
default: {
luaK_exp2RK(fs, v);
break;
}
}
}
void luaK_posfix (FuncState *fs, BinOpr op, expdesc *e1, expdesc *e2) {
switch (op) {
case OPR_AND: {
lua_assert(e1->t == NO_JUMP); /* list must be closed */
luaK_dischargevars(fs, e2);
luaK_concat(fs, &e2->f, e1->f);
*e1 = *e2;
break;
}
case OPR_OR: {
lua_assert(e1->f == NO_JUMP); /* list must be closed */
luaK_dischargevars(fs, e2);
luaK_concat(fs, &e2->t, e1->t);
*e1 = *e2;
break;
}
case OPR_CONCAT: {
luaK_exp2val(fs, e2);
if (e2->k == VRELOCABLE && GET_OPCODE(getcode(fs, e2)) == OP_CONCAT) {
lua_assert(e1->u.s.info == GETARG_B(getcode(fs, e2))-1);
freeexp(fs, e1);
SETARG_B(getcode(fs, e2), e1->u.s.info);
e1->k = VRELOCABLE; e1->u.s.info = e2->u.s.info;
}
else {
luaK_exp2nextreg(fs, e2); /* operand must be on the 'stack' */
codearith(fs, OP_CONCAT, e1, e2);
}
break;
}
case OPR_ADD: codearith(fs, OP_ADD, e1, e2); break;
case OPR_SUB: codearith(fs, OP_SUB, e1, e2); break;
case OPR_MUL: codearith(fs, OP_MUL, e1, e2); break;
case OPR_DIV: codearith(fs, OP_DIV, e1, e2); break;
case OPR_MOD: codearith(fs, OP_MOD, e1, e2); break;
case OPR_POW: codearith(fs, OP_POW, e1, e2); break;
case OPR_EQ: codecomp(fs, OP_EQ, 1, e1, e2); break;
case OPR_NE: codecomp(fs, OP_EQ, 0, e1, e2); break;
case OPR_LT: codecomp(fs, OP_LT, 1, e1, e2); break;
case OPR_LE: codecomp(fs, OP_LE, 1, e1, e2); break;
case OPR_GT: codecomp(fs, OP_LT, 0, e1, e2); break;
case OPR_GE: codecomp(fs, OP_LE, 0, e1, e2); break;
default: lua_assert(0);
}
}
void luaK_fixline (FuncState *fs, int line) {
fs->f->lineinfo[fs->pc - 1] = line;
}
static int luaK_code (FuncState *fs, Instruction i, int line) {
Proto *f = fs->f;
dischargejpc(fs); /* `pc' will change */
/* put new instruction in code array */
luaM_growvector(fs->L, f->code, fs->pc, f->sizecode, Instruction,
MAX_INT, "code size overflow");
f->code[fs->pc] = i;
/* save corresponding line information */
luaM_growvector(fs->L, f->lineinfo, fs->pc, f->sizelineinfo, int,
MAX_INT, "code size overflow");
f->lineinfo[fs->pc] = line;
return fs->pc++;
}
int luaK_codeABC (FuncState *fs, OpCode o, int a, int b, int c) {
lua_assert(getOpMode(o) == iABC);
lua_assert(getBMode(o) != OpArgN || b == 0);
lua_assert(getCMode(o) != OpArgN || c == 0);
return luaK_code(fs, CREATE_ABC(o, a, b, c), fs->ls->lastline);
}
int luaK_codeABx (FuncState *fs, OpCode o, int a, unsigned int bc) {
lua_assert(getOpMode(o) == iABx || getOpMode(o) == iAsBx);
lua_assert(getCMode(o) == OpArgN);
return luaK_code(fs, CREATE_ABx(o, a, bc), fs->ls->lastline);
}
void luaK_setlist (FuncState *fs, int base, int nelems, int tostore) {
int c = (nelems - 1)/LFIELDS_PER_FLUSH + 1;
int b = (tostore == LUA_MULTRET) ? 0 : tostore;
lua_assert(tostore != 0);
if (c <= MAXARG_C)
luaK_codeABC(fs, OP_SETLIST, base, b, c);
else {
luaK_codeABC(fs, OP_SETLIST, base, b, 0);
luaK_code(fs, cast(Instruction, c), fs->ls->lastline);
}
fs->freereg = base + 1; /* free registers with list values */
}

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/*
** $Id: lcode.h,v 1.48.1.1 2007/12/27 13:02:25 roberto Exp $
** 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"
/*
** 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
*/
typedef enum BinOpr {
OPR_ADD, OPR_SUB, OPR_MUL, OPR_DIV, OPR_MOD, OPR_POW,
OPR_CONCAT,
OPR_NE, OPR_EQ,
OPR_LT, OPR_LE, OPR_GT, OPR_GE,
OPR_AND, OPR_OR,
OPR_NOBINOPR
} BinOpr;
typedef enum UnOpr { OPR_MINUS, OPR_NOT, OPR_LEN, OPR_NOUNOPR } UnOpr;
#define getcode(fs,e) ((fs)->f->code[(e)->u.s.info])
#define luaK_codeAsBx(fs,o,A,sBx) luaK_codeABx(fs,o,A,(sBx)+MAXARG_sBx)
#define luaK_setmultret(fs,e) luaK_setreturns(fs, e, LUA_MULTRET)
LUAI_FUNC int luaK_codeABx (FuncState *fs, OpCode o, int A, unsigned int Bx);
LUAI_FUNC int luaK_codeABC (FuncState *fs, OpCode o, int A, int B, int C);
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 int luaK_stringK (FuncState *fs, TString *s);
LUAI_FUNC int luaK_numberK (FuncState *fs, lua_Number r);
LUAI_FUNC void luaK_dischargevars (FuncState *fs, expdesc *e);
LUAI_FUNC int luaK_exp2anyreg (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_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);
LUAI_FUNC void luaK_infix (FuncState *fs, BinOpr op, expdesc *v);
LUAI_FUNC void luaK_posfix (FuncState *fs, BinOpr op, expdesc *v1, expdesc *v2);
LUAI_FUNC void luaK_setlist (FuncState *fs, int base, int nelems, int tostore);
#endif

398
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/*
** $Id: ldblib.c,v 1.104.1.4 2009/08/04 18:50:18 roberto Exp $
** Interface from Lua to its debug API
** See Copyright Notice in lua.h
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define ldblib_c
#define LUA_LIB
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
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_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
"nil or table expected");
lua_settop(L, 2);
lua_pushboolean(L, lua_setmetatable(L, 1));
return 1;
}
static int db_getfenv (lua_State *L) {
luaL_checkany(L, 1);
lua_getfenv(L, 1);
return 1;
}
static int db_setfenv (lua_State *L) {
luaL_checktype(L, 2, LUA_TTABLE);
lua_settop(L, 2);
if (lua_setfenv(L, 1) == 0)
luaL_error(L, LUA_QL("setfenv")
" cannot change environment of given object");
return 1;
}
static void settabss (lua_State *L, const char *i, const char *v) {
lua_pushstring(L, v);
lua_setfield(L, -2, i);
}
static void settabsi (lua_State *L, const char *i, int v) {
lua_pushinteger(L, v);
lua_setfield(L, -2, i);
}
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;
}
}
static void treatstackoption (lua_State *L, lua_State *L1, const char *fname) {
if (L == L1) {
lua_pushvalue(L, -2);
lua_remove(L, -3);
}
else
lua_xmove(L1, L, 1);
lua_setfield(L, -2, fname);
}
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, "flnSu");
if (lua_isnumber(L, arg+1)) {
if (!lua_getstack(L1, (int)lua_tointeger(L, arg+1), &ar)) {
lua_pushnil(L); /* level out of range */
return 1;
}
}
else if (lua_isfunction(L, arg+1)) {
lua_pushfstring(L, ">%s", options);
options = lua_tostring(L, -1);
lua_pushvalue(L, arg+1);
lua_xmove(L, L1, 1);
}
else
return luaL_argerror(L, arg+1, "function or level expected");
if (!lua_getinfo(L1, options, &ar))
return luaL_argerror(L, arg+2, "invalid option");
lua_createtable(L, 0, 2);
if (strchr(options, 'S')) {
settabss(L, "source", ar.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);
if (strchr(options, 'n')) {
settabss(L, "name", ar.name);
settabss(L, "namewhat", ar.namewhat);
}
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);
lua_Debug ar;
const char *name;
if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar)) /* out of range? */
return luaL_argerror(L, arg+1, "level out of range");
name = lua_getlocal(L1, &ar, luaL_checkint(L, arg+2));
if (name) {
lua_xmove(L1, L, 1);
lua_pushstring(L, name);
lua_pushvalue(L, -2);
return 2;
}
else {
lua_pushnil(L);
return 1;
}
}
static int db_setlocal (lua_State *L) {
int arg;
lua_State *L1 = getthread(L, &arg);
lua_Debug ar;
if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar)) /* out of range? */
return luaL_argerror(L, arg+1, "level out of range");
luaL_checkany(L, arg+3);
lua_settop(L, arg+3);
lua_xmove(L, L1, 1);
lua_pushstring(L, lua_setlocal(L1, &ar, luaL_checkint(L, arg+2)));
return 1;
}
static int auxupvalue (lua_State *L, int get) {
const char *name;
int n = luaL_checkint(L, 2);
luaL_checktype(L, 1, LUA_TFUNCTION);
if (lua_iscfunction(L, 1)) return 0; /* cannot touch C upvalues from Lua */
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));
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);
}
static const char KEY_HOOK = 'h';
static void hookf (lua_State *L, lua_Debug *ar) {
static const char *const hooknames[] =
{"call", "return", "line", "count", "tail return"};
lua_pushlightuserdata(L, (void *)&KEY_HOOK);
lua_rawget(L, LUA_REGISTRYINDEX);
lua_pushlightuserdata(L, L);
lua_rawget(L, -2);
if (lua_isfunction(L, -1)) {
lua_pushstring(L, hooknames[(int)ar->event]);
if (ar->currentline >= 0)
lua_pushinteger(L, ar->currentline);
else lua_pushnil(L);
lua_assert(lua_getinfo(L, "lS", ar));
lua_call(L, 2, 0);
}
}
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;
}
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 void gethooktable (lua_State *L) {
lua_pushlightuserdata(L, (void *)&KEY_HOOK);
lua_rawget(L, LUA_REGISTRYINDEX);
if (!lua_istable(L, -1)) {
lua_pop(L, 1);
lua_createtable(L, 0, 1);
lua_pushlightuserdata(L, (void *)&KEY_HOOK);
lua_pushvalue(L, -2);
lua_rawset(L, LUA_REGISTRYINDEX);
}
}
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)) {
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 = luaL_optint(L, arg+3, 0);
func = hookf; mask = makemask(smask, count);
}
gethooktable(L);
lua_pushlightuserdata(L, L1);
lua_pushvalue(L, arg+1);
lua_rawset(L, -3); /* set new hook */
lua_pop(L, 1); /* remove hook table */
lua_sethook(L1, func, mask, count); /* set hooks */
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 && hook != hookf) /* external hook? */
lua_pushliteral(L, "external hook");
else {
gethooktable(L);
lua_pushlightuserdata(L, L1);
lua_rawget(L, -2); /* get hook */
lua_remove(L, -2); /* remove hook table */
}
lua_pushstring(L, unmakemask(mask, buff));
lua_pushinteger(L, lua_gethookcount(L1));
return 3;
}
static int db_debug (lua_State *L) {
for (;;) {
char buffer[250];
fputs("lua_debug> ", stderr);
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)) {
fputs(lua_tostring(L, -1), stderr);
fputs("\n", stderr);
}
lua_settop(L, 0); /* remove eventual returns */
}
}
#define LEVELS1 12 /* size of the first part of the stack */
#define LEVELS2 10 /* size of the second part of the stack */
static int db_errorfb (lua_State *L) {
int level;
int firstpart = 1; /* still before eventual `...' */
int arg;
lua_State *L1 = getthread(L, &arg);
lua_Debug ar;
if (lua_isnumber(L, arg+2)) {
level = (int)lua_tointeger(L, arg+2);
lua_pop(L, 1);
}
else
level = (L == L1) ? 1 : 0; /* level 0 may be this own function */
if (lua_gettop(L) == arg)
lua_pushliteral(L, "");
else if (!lua_isstring(L, arg+1)) return 1; /* message is not a string */
else lua_pushliteral(L, "\n");
lua_pushliteral(L, "stack traceback:");
while (lua_getstack(L1, level++, &ar)) {
if (level > LEVELS1 && firstpart) {
/* no more than `LEVELS2' more levels? */
if (!lua_getstack(L1, level+LEVELS2, &ar))
level--; /* keep going */
else {
lua_pushliteral(L, "\n\t..."); /* too many levels */
while (lua_getstack(L1, level+LEVELS2, &ar)) /* find last levels */
level++;
}
firstpart = 0;
continue;
}
lua_pushliteral(L, "\n\t");
lua_getinfo(L1, "Snl", &ar);
lua_pushfstring(L, "%s:", ar.short_src);
if (ar.currentline > 0)
lua_pushfstring(L, "%d:", ar.currentline);
if (*ar.namewhat != '\0') /* is there a name? */
lua_pushfstring(L, " in function " LUA_QS, ar.name);
else {
if (*ar.what == 'm') /* main? */
lua_pushfstring(L, " in main chunk");
else if (*ar.what == 'C' || *ar.what == 't')
lua_pushliteral(L, " ?"); /* C function or tail call */
else
lua_pushfstring(L, " in function <%s:%d>",
ar.short_src, ar.linedefined);
}
lua_concat(L, lua_gettop(L) - arg);
}
lua_concat(L, lua_gettop(L) - arg);
return 1;
}
static const luaL_Reg dblib[] = {
{"debug", db_debug},
{"getfenv", db_getfenv},
{"gethook", db_gethook},
{"getinfo", db_getinfo},
{"getlocal", db_getlocal},
{"getregistry", db_getregistry},
{"getmetatable", db_getmetatable},
{"getupvalue", db_getupvalue},
{"setfenv", db_setfenv},
{"sethook", db_sethook},
{"setlocal", db_setlocal},
{"setmetatable", db_setmetatable},
{"setupvalue", db_setupvalue},
{"traceback", db_errorfb},
{NULL, NULL}
};
LUALIB_API int luaopen_debug (lua_State *L) {
luaL_register(L, LUA_DBLIBNAME, dblib);
return 1;
}

638
src/ldebug.c Normal file
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@ -0,0 +1,638 @@
/*
** $Id: ldebug.c,v 2.29.1.6 2008/05/08 16:56:26 roberto Exp $
** Debug Interface
** See Copyright Notice in lua.h
*/
#include <stdarg.h>
#include <stddef.h>
#include <string.h>
#define ldebug_c
#define LUA_CORE
#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"
static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name);
static int currentpc (lua_State *L, CallInfo *ci) {
if (!isLua(ci)) return -1; /* function is not a Lua function? */
if (ci == L->ci)
ci->savedpc = L->savedpc;
return pcRel(ci->savedpc, ci_func(ci)->l.p);
}
static int currentline (lua_State *L, CallInfo *ci) {
int pc = currentpc(L, ci);
if (pc < 0)
return -1; /* only active lua functions have current-line information */
else
return getline(ci_func(ci)->l.p, pc);
}
/*
** this function can be called asynchronous (e.g. during a signal)
*/
LUA_API int lua_sethook (lua_State *L, lua_Hook func, int mask, int count) {
if (func == NULL || mask == 0) { /* turn off hooks? */
mask = 0;
func = NULL;
}
L->hook = func;
L->basehookcount = count;
resethookcount(L);
L->hookmask = cast_byte(mask);
return 1;
}
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;
lua_lock(L);
for (ci = L->ci; level > 0 && ci > L->base_ci; ci--) {
level--;
if (f_isLua(ci)) /* Lua function? */
level -= ci->tailcalls; /* skip lost tail calls */
}
if (level == 0 && ci > L->base_ci) { /* level found? */
status = 1;
ar->i_ci = cast_int(ci - L->base_ci);
}
else if (level < 0) { /* level is of a lost tail call? */
status = 1;
ar->i_ci = 0;
}
else status = 0; /* no such level */
lua_unlock(L);
return status;
}
static Proto *getluaproto (CallInfo *ci) {
return (isLua(ci) ? ci_func(ci)->l.p : NULL);
}
static const char *findlocal (lua_State *L, CallInfo *ci, int n) {
const char *name;
Proto *fp = getluaproto(ci);
if (fp && (name = luaF_getlocalname(fp, n, currentpc(L, ci))) != NULL)
return name; /* is a local variable in a Lua function */
else {
StkId limit = (ci == L->ci) ? L->top : (ci+1)->func;
if (limit - ci->base >= n && n > 0) /* is 'n' inside 'ci' stack? */
return "(*temporary)";
else
return NULL;
}
}
LUA_API const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n) {
CallInfo *ci = L->base_ci + ar->i_ci;
const char *name = findlocal(L, ci, n);
lua_lock(L);
if (name)
luaA_pushobject(L, ci->base + (n - 1));
lua_unlock(L);
return name;
}
LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) {
CallInfo *ci = L->base_ci + ar->i_ci;
const char *name = findlocal(L, ci, n);
lua_lock(L);
if (name)
setobjs2s(L, ci->base + (n - 1), L->top - 1);
L->top--; /* pop value */
lua_unlock(L);
return name;
}
static void funcinfo (lua_Debug *ar, Closure *cl) {
if (cl->c.isC) {
ar->source = "=[C]";
ar->linedefined = -1;
ar->lastlinedefined = -1;
ar->what = "C";
}
else {
ar->source = getstr(cl->l.p->source);
ar->linedefined = cl->l.p->linedefined;
ar->lastlinedefined = cl->l.p->lastlinedefined;
ar->what = (ar->linedefined == 0) ? "main" : "Lua";
}
luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE);
}
static void info_tailcall (lua_Debug *ar) {
ar->name = ar->namewhat = "";
ar->what = "tail";
ar->lastlinedefined = ar->linedefined = ar->currentline = -1;
ar->source = "=(tail call)";
luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE);
ar->nups = 0;
}
static void collectvalidlines (lua_State *L, Closure *f) {
if (f == NULL || f->c.isC) {
setnilvalue(L->top);
}
else {
Table *t = luaH_new(L, 0, 0);
int *lineinfo = f->l.p->lineinfo;
int i;
for (i=0; i<f->l.p->sizelineinfo; i++)
setbvalue(luaH_setnum(L, t, lineinfo[i]), 1);
sethvalue(L, L->top, t);
}
incr_top(L);
}
static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar,
Closure *f, CallInfo *ci) {
int status = 1;
if (f == NULL) {
info_tailcall(ar);
return status;
}
for (; *what; what++) {
switch (*what) {
case 'S': {
funcinfo(ar, f);
break;
}
case 'l': {
ar->currentline = (ci) ? currentline(L, ci) : -1;
break;
}
case 'u': {
ar->nups = f->c.nupvalues;
break;
}
case 'n': {
ar->namewhat = (ci) ? getfuncname(L, ci, &ar->name) : NULL;
if (ar->namewhat == NULL) {
ar->namewhat = ""; /* not found */
ar->name = NULL;
}
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 *f = NULL;
CallInfo *ci = NULL;
lua_lock(L);
if (*what == '>') {
StkId func = L->top - 1;
luai_apicheck(L, ttisfunction(func));
what++; /* skip the '>' */
f = clvalue(func);
L->top--; /* pop function */
}
else if (ar->i_ci != 0) { /* no tail call? */
ci = L->base_ci + ar->i_ci;
lua_assert(ttisfunction(ci->func));
f = clvalue(ci->func);
}
status = auxgetinfo(L, what, ar, f, ci);
if (strchr(what, 'f')) {
if (f == NULL) setnilvalue(L->top);
else setclvalue(L, L->top, f);
incr_top(L);
}
if (strchr(what, 'L'))
collectvalidlines(L, f);
lua_unlock(L);
return status;
}
/*
** {======================================================
** Symbolic Execution and code checker
** =======================================================
*/
#define check(x) if (!(x)) return 0;
#define checkjump(pt,pc) check(0 <= pc && pc < pt->sizecode)
#define checkreg(pt,reg) check((reg) < (pt)->maxstacksize)
static int precheck (const Proto *pt) {
check(pt->maxstacksize <= MAXSTACK);
check(pt->numparams+(pt->is_vararg & VARARG_HASARG) <= pt->maxstacksize);
check(!(pt->is_vararg & VARARG_NEEDSARG) ||
(pt->is_vararg & VARARG_HASARG));
check(pt->sizeupvalues <= pt->nups);
check(pt->sizelineinfo == pt->sizecode || pt->sizelineinfo == 0);
check(pt->sizecode > 0 && GET_OPCODE(pt->code[pt->sizecode-1]) == OP_RETURN);
return 1;
}
#define checkopenop(pt,pc) luaG_checkopenop((pt)->code[(pc)+1])
int luaG_checkopenop (Instruction i) {
switch (GET_OPCODE(i)) {
case OP_CALL:
case OP_TAILCALL:
case OP_RETURN:
case OP_SETLIST: {
check(GETARG_B(i) == 0);
return 1;
}
default: return 0; /* invalid instruction after an open call */
}
}
static int checkArgMode (const Proto *pt, int r, enum OpArgMask mode) {
switch (mode) {
case OpArgN: check(r == 0); break;
case OpArgU: break;
case OpArgR: checkreg(pt, r); break;
case OpArgK:
check(ISK(r) ? INDEXK(r) < pt->sizek : r < pt->maxstacksize);
break;
}
return 1;
}
static Instruction symbexec (const Proto *pt, int lastpc, int reg) {
int pc;
int last; /* stores position of last instruction that changed `reg' */
last = pt->sizecode-1; /* points to final return (a `neutral' instruction) */
check(precheck(pt));
for (pc = 0; pc < lastpc; pc++) {
Instruction i = pt->code[pc];
OpCode op = GET_OPCODE(i);
int a = GETARG_A(i);
int b = 0;
int c = 0;
check(op < NUM_OPCODES);
checkreg(pt, a);
switch (getOpMode(op)) {
case iABC: {
b = GETARG_B(i);
c = GETARG_C(i);
check(checkArgMode(pt, b, getBMode(op)));
check(checkArgMode(pt, c, getCMode(op)));
break;
}
case iABx: {
b = GETARG_Bx(i);
if (getBMode(op) == OpArgK) check(b < pt->sizek);
break;
}
case iAsBx: {
b = GETARG_sBx(i);
if (getBMode(op) == OpArgR) {
int dest = pc+1+b;
check(0 <= dest && dest < pt->sizecode);
if (dest > 0) {
int j;
/* check that it does not jump to a setlist count; this
is tricky, because the count from a previous setlist may
have the same value of an invalid setlist; so, we must
go all the way back to the first of them (if any) */
for (j = 0; j < dest; j++) {
Instruction d = pt->code[dest-1-j];
if (!(GET_OPCODE(d) == OP_SETLIST && GETARG_C(d) == 0)) break;
}
/* if 'j' is even, previous value is not a setlist (even if
it looks like one) */
check((j&1) == 0);
}
}
break;
}
}
if (testAMode(op)) {
if (a == reg) last = pc; /* change register `a' */
}
if (testTMode(op)) {
check(pc+2 < pt->sizecode); /* check skip */
check(GET_OPCODE(pt->code[pc+1]) == OP_JMP);
}
switch (op) {
case OP_LOADBOOL: {
if (c == 1) { /* does it jump? */
check(pc+2 < pt->sizecode); /* check its jump */
check(GET_OPCODE(pt->code[pc+1]) != OP_SETLIST ||
GETARG_C(pt->code[pc+1]) != 0);
}
break;
}
case OP_LOADNIL: {
if (a <= reg && reg <= b)
last = pc; /* set registers from `a' to `b' */
break;
}
case OP_GETUPVAL:
case OP_SETUPVAL: {
check(b < pt->nups);
break;
}
case OP_GETGLOBAL:
case OP_SETGLOBAL: {
check(ttisstring(&pt->k[b]));
break;
}
case OP_SELF: {
checkreg(pt, a+1);
if (reg == a+1) last = pc;
break;
}
case OP_CONCAT: {
check(b < c); /* at least two operands */
break;
}
case OP_TFORLOOP: {
check(c >= 1); /* at least one result (control variable) */
checkreg(pt, a+2+c); /* space for results */
if (reg >= a+2) last = pc; /* affect all regs above its base */
break;
}
case OP_FORLOOP:
case OP_FORPREP:
checkreg(pt, a+3);
/* go through */
case OP_JMP: {
int dest = pc+1+b;
/* not full check and jump is forward and do not skip `lastpc'? */
if (reg != NO_REG && pc < dest && dest <= lastpc)
pc += b; /* do the jump */
break;
}
case OP_CALL:
case OP_TAILCALL: {
if (b != 0) {
checkreg(pt, a+b-1);
}
c--; /* c = num. returns */
if (c == LUA_MULTRET) {
check(checkopenop(pt, pc));
}
else if (c != 0)
checkreg(pt, a+c-1);
if (reg >= a) last = pc; /* affect all registers above base */
break;
}
case OP_RETURN: {
b--; /* b = num. returns */
if (b > 0) checkreg(pt, a+b-1);
break;
}
case OP_SETLIST: {
if (b > 0) checkreg(pt, a + b);
if (c == 0) {
pc++;
check(pc < pt->sizecode - 1);
}
break;
}
case OP_CLOSURE: {
int nup, j;
check(b < pt->sizep);
nup = pt->p[b]->nups;
check(pc + nup < pt->sizecode);
for (j = 1; j <= nup; j++) {
OpCode op1 = GET_OPCODE(pt->code[pc + j]);
check(op1 == OP_GETUPVAL || op1 == OP_MOVE);
}
if (reg != NO_REG) /* tracing? */
pc += nup; /* do not 'execute' these pseudo-instructions */
break;
}
case OP_VARARG: {
check((pt->is_vararg & VARARG_ISVARARG) &&
!(pt->is_vararg & VARARG_NEEDSARG));
b--;
if (b == LUA_MULTRET) check(checkopenop(pt, pc));
checkreg(pt, a+b-1);
break;
}
default: break;
}
}
return pt->code[last];
}
#undef check
#undef checkjump
#undef checkreg
/* }====================================================== */
int luaG_checkcode (const Proto *pt) {
return (symbexec(pt, pt->sizecode, NO_REG) != 0);
}
static const char *kname (Proto *p, int c) {
if (ISK(c) && ttisstring(&p->k[INDEXK(c)]))
return svalue(&p->k[INDEXK(c)]);
else
return "?";
}
static const char *getobjname (lua_State *L, CallInfo *ci, int stackpos,
const char **name) {
if (isLua(ci)) { /* a Lua function? */
Proto *p = ci_func(ci)->l.p;
int pc = currentpc(L, ci);
Instruction i;
*name = luaF_getlocalname(p, stackpos+1, pc);
if (*name) /* is a local? */
return "local";
i = symbexec(p, pc, stackpos); /* try symbolic execution */
lua_assert(pc != -1);
switch (GET_OPCODE(i)) {
case OP_GETGLOBAL: {
int g = GETARG_Bx(i); /* global index */
lua_assert(ttisstring(&p->k[g]));
*name = svalue(&p->k[g]);
return "global";
}
case OP_MOVE: {
int a = GETARG_A(i);
int b = GETARG_B(i); /* move from `b' to `a' */
if (b < a)
return getobjname(L, ci, b, name); /* get name for `b' */
break;
}
case OP_GETTABLE: {
int k = GETARG_C(i); /* key index */
*name = kname(p, k);
return "field";
}
case OP_GETUPVAL: {
int u = GETARG_B(i); /* upvalue index */
*name = p->upvalues ? getstr(p->upvalues[u]) : "?";
return "upvalue";
}
case OP_SELF: {
int k = GETARG_C(i); /* key index */
*name = kname(p, k);
return "method";
}
default: break;
}
}
return NULL; /* no useful name found */
}
static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name) {
Instruction i;
if ((isLua(ci) && ci->tailcalls > 0) || !isLua(ci - 1))
return NULL; /* calling function is not Lua (or is unknown) */
ci--; /* calling function */
i = ci_func(ci)->l.p->code[currentpc(L, ci)];
if (GET_OPCODE(i) == OP_CALL || GET_OPCODE(i) == OP_TAILCALL ||
GET_OPCODE(i) == OP_TFORLOOP)
return getobjname(L, ci, GETARG_A(i), name);
else
return NULL; /* no useful name can be found */
}
/* only ANSI way to check whether a pointer points to an array */
static int isinstack (CallInfo *ci, const TValue *o) {
StkId p;
for (p = ci->base; p < ci->top; p++)
if (o == p) return 1;
return 0;
}
void luaG_typeerror (lua_State *L, const TValue *o, const char *op) {
const char *name = NULL;
const char *t = luaT_typenames[ttype(o)];
const char *kind = (isinstack(L->ci, o)) ?
getobjname(L, L->ci, cast_int(o - L->base), &name) :
NULL;
if (kind)
luaG_runerror(L, "attempt to %s %s " LUA_QS " (a %s value)",
op, kind, name, t);
else
luaG_runerror(L, "attempt to %s a %s value", op, t);
}
void luaG_concaterror (lua_State *L, StkId p1, StkId p2) {
if (ttisstring(p1) || ttisnumber(p1)) p1 = p2;
lua_assert(!ttisstring(p1) && !ttisnumber(p1));
luaG_typeerror(L, p1, "concatenate");
}
void luaG_aritherror (lua_State *L, const TValue *p1, const TValue *p2) {
TValue temp;
if (luaV_tonumber(p1, &temp) == NULL)
p2 = p1; /* first operand is wrong */
luaG_typeerror(L, p2, "perform arithmetic on");
}
int luaG_ordererror (lua_State *L, const TValue *p1, const TValue *p2) {
const char *t1 = luaT_typenames[ttype(p1)];
const char *t2 = luaT_typenames[ttype(p2)];
if (t1[2] == t2[2])
luaG_runerror(L, "attempt to compare two %s values", t1);
else
luaG_runerror(L, "attempt to compare %s with %s", t1, t2);
return 0;
}
static void addinfo (lua_State *L, const char *msg) {
CallInfo *ci = L->ci;
if (isLua(ci)) { /* is Lua code? */
char buff[LUA_IDSIZE]; /* add file:line information */
int line = currentline(L, ci);
luaO_chunkid(buff, getstr(getluaproto(ci)->source), LUA_IDSIZE);
luaO_pushfstring(L, "%s:%d: %s", buff, line, msg);
}
}
void luaG_errormsg (lua_State *L) {
if (L->errfunc != 0) { /* is there an error handling function? */
StkId errfunc = restorestack(L, L->errfunc);
if (!ttisfunction(errfunc)) luaD_throw(L, LUA_ERRERR);
setobjs2s(L, L->top, L->top - 1); /* move argument */
setobjs2s(L, L->top - 1, errfunc); /* push function */
incr_top(L);
luaD_call(L, L->top - 2, 1); /* call it */
}
luaD_throw(L, LUA_ERRRUN);
}
void luaG_runerror (lua_State *L, const char *fmt, ...) {
va_list argp;
va_start(argp, fmt);
addinfo(L, luaO_pushvfstring(L, fmt, argp));
va_end(argp);
luaG_errormsg(L);
}

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/*
** $Id: ldebug.h,v 2.3.1.1 2007/12/27 13:02:25 roberto Exp $
** Auxiliary functions from Debug Interface module
** See Copyright Notice in lua.h
*/
#ifndef ldebug_h
#define ldebug_h
#include "lstate.h"
#define pcRel(pc, p) (cast(int, (pc) - (p)->code) - 1)
#define getline(f,pc) (((f)->lineinfo) ? (f)->lineinfo[pc] : 0)
#define resethookcount(L) (L->hookcount = L->basehookcount)
LUAI_FUNC void luaG_typeerror (lua_State *L, const TValue *o,
const char *opname);
LUAI_FUNC void luaG_concaterror (lua_State *L, StkId p1, StkId p2);
LUAI_FUNC void luaG_aritherror (lua_State *L, const TValue *p1,
const TValue *p2);
LUAI_FUNC int luaG_ordererror (lua_State *L, const TValue *p1,
const TValue *p2);
LUAI_FUNC void luaG_runerror (lua_State *L, const char *fmt, ...);
LUAI_FUNC void luaG_errormsg (lua_State *L);
LUAI_FUNC int luaG_checkcode (const Proto *pt);
LUAI_FUNC int luaG_checkopenop (Instruction i);
#endif

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/*
** $Id: ldo.c,v 2.38.1.4 2012/01/18 02:27:10 roberto Exp $
** Stack and Call structure of Lua
** See Copyright Notice in lua.h
*/
#include <setjmp.h>
#include <stdlib.h>
#include <string.h>
#define ldo_c
#define LUA_CORE
#include "lua.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"
/*
** {======================================================
** Error-recovery functions
** =======================================================
*/
/* 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: {
setsvalue2s(L, oldtop, luaS_newliteral(L, MEMERRMSG));
break;
}
case LUA_ERRERR: {
setsvalue2s(L, oldtop, luaS_newliteral(L, "error in error handling"));
break;
}
case LUA_ERRSYNTAX:
case LUA_ERRRUN: {
setobjs2s(L, oldtop, L->top - 1); /* error message on current top */
break;
}
}
L->top = oldtop + 1;
}
static void restore_stack_limit (lua_State *L) {
lua_assert(L->stack_last - L->stack == L->stacksize - EXTRA_STACK - 1);
if (L->size_ci > LUAI_MAXCALLS) { /* there was an overflow? */
int inuse = cast_int(L->ci - L->base_ci);
if (inuse + 1 < LUAI_MAXCALLS) /* can `undo' overflow? */
luaD_reallocCI(L, LUAI_MAXCALLS);
}
}
static void resetstack (lua_State *L, int status) {
L->ci = L->base_ci;
L->base = L->ci->base;
luaF_close(L, L->base); /* close eventual pending closures */
luaD_seterrorobj(L, status, L->base);
L->nCcalls = L->baseCcalls;
L->allowhook = 1;
restore_stack_limit(L);
L->errfunc = 0;
L->errorJmp = NULL;
}
void luaD_throw (lua_State *L, int errcode) {
if (L->errorJmp) {
L->errorJmp->status = errcode;
LUAI_THROW(L, L->errorJmp);
}
else {
L->status = cast_byte(errcode);
if (G(L)->panic) {
resetstack(L, errcode);
lua_unlock(L);
G(L)->panic(L);
}
exit(EXIT_FAILURE);
}
}
int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud) {
struct lua_longjmp lj;
lj.status = 0;
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 */
return lj.status;
}
/* }====================================================== */
static void correctstack (lua_State *L, TValue *oldstack) {
CallInfo *ci;
GCObject *up;
L->top = (L->top - oldstack) + L->stack;
for (up = L->openupval; up != NULL; up = up->gch.next)
gco2uv(up)->v = (gco2uv(up)->v - oldstack) + L->stack;
for (ci = L->base_ci; ci <= L->ci; ci++) {
ci->top = (ci->top - oldstack) + L->stack;
ci->base = (ci->base - oldstack) + L->stack;
ci->func = (ci->func - oldstack) + L->stack;
}
L->base = (L->base - oldstack) + L->stack;
}
void luaD_reallocstack (lua_State *L, int newsize) {
TValue *oldstack = L->stack;
int realsize = newsize + 1 + EXTRA_STACK;
lua_assert(L->stack_last - L->stack == L->stacksize - EXTRA_STACK - 1);
luaM_reallocvector(L, L->stack, L->stacksize, realsize, TValue);
L->stacksize = realsize;
L->stack_last = L->stack+newsize;
correctstack(L, oldstack);
}
void luaD_reallocCI (lua_State *L, int newsize) {
CallInfo *oldci = L->base_ci;
luaM_reallocvector(L, L->base_ci, L->size_ci, newsize, CallInfo);
L->size_ci = newsize;
L->ci = (L->ci - oldci) + L->base_ci;
L->end_ci = L->base_ci + L->size_ci - 1;
}
void luaD_growstack (lua_State *L, int n) {
if (n <= L->stacksize) /* double size is enough? */
luaD_reallocstack(L, 2*L->stacksize);
else
luaD_reallocstack(L, L->stacksize + n);
}
static CallInfo *growCI (lua_State *L) {
if (L->size_ci > LUAI_MAXCALLS) /* overflow while handling overflow? */
luaD_throw(L, LUA_ERRERR);
else {
luaD_reallocCI(L, 2*L->size_ci);
if (L->size_ci > LUAI_MAXCALLS)
luaG_runerror(L, "stack overflow");
}
return ++L->ci;
}
void luaD_callhook (lua_State *L, int event, int line) {
lua_Hook hook = L->hook;
if (hook && L->allowhook) {
ptrdiff_t top = savestack(L, L->top);
ptrdiff_t ci_top = savestack(L, L->ci->top);
lua_Debug ar;
ar.event = event;
ar.currentline = line;
if (event == LUA_HOOKTAILRET)
ar.i_ci = 0; /* tail call; no debug information about it */
else
ar.i_ci = cast_int(L->ci - L->base_ci);
luaD_checkstack(L, LUA_MINSTACK); /* ensure minimum stack size */
L->ci->top = L->top + LUA_MINSTACK;
lua_assert(L->ci->top <= L->stack_last);
L->allowhook = 0; /* cannot call hooks inside a hook */
lua_unlock(L);
(*hook)(L, &ar);
lua_lock(L);
lua_assert(!L->allowhook);
L->allowhook = 1;
L->ci->top = restorestack(L, ci_top);
L->top = restorestack(L, top);
}
}
static StkId adjust_varargs (lua_State *L, Proto *p, int actual) {
int i;
int nfixargs = p->numparams;
Table *htab = NULL;
StkId base, fixed;
for (; actual < nfixargs; ++actual)
setnilvalue(L->top++);
#if defined(LUA_COMPAT_VARARG)
if (p->is_vararg & VARARG_NEEDSARG) { /* compat. with old-style vararg? */
int nvar = actual - nfixargs; /* number of extra arguments */
lua_assert(p->is_vararg & VARARG_HASARG);
luaC_checkGC(L);
luaD_checkstack(L, p->maxstacksize);
htab = luaH_new(L, nvar, 1); /* create `arg' table */
for (i=0; i<nvar; i++) /* put extra arguments into `arg' table */
setobj2n(L, luaH_setnum(L, htab, i+1), L->top - nvar + i);
/* store counter in field `n' */
setnvalue(luaH_setstr(L, htab, luaS_newliteral(L, "n")), cast_num(nvar));
}
#endif
/* move fixed parameters to final position */
fixed = L->top - actual; /* first fixed argument */
base = L->top; /* final position of first argument */
for (i=0; i<nfixargs; i++) {
setobjs2s(L, L->top++, fixed+i);
setnilvalue(fixed+i);
}
/* add `arg' parameter */
if (htab) {
sethvalue(L, L->top++, htab);
lua_assert(iswhite(obj2gco(htab)));
}
return base;
}
static StkId tryfuncTM (lua_State *L, StkId func) {
const TValue *tm = luaT_gettmbyobj(L, func, TM_CALL);
StkId p;
ptrdiff_t funcr = savestack(L, func);
if (!ttisfunction(tm))
luaG_typeerror(L, func, "call");
/* Open a hole inside the stack at `func' */
for (p = L->top; p > func; p--) setobjs2s(L, p, p-1);
incr_top(L);
func = restorestack(L, funcr); /* previous call may change stack */
setobj2s(L, func, tm); /* tag method is the new function to be called */
return func;
}
#define inc_ci(L) \
((L->ci == L->end_ci) ? growCI(L) : \
(condhardstacktests(luaD_reallocCI(L, L->size_ci)), ++L->ci))
int luaD_precall (lua_State *L, StkId func, int nresults) {
LClosure *cl;
ptrdiff_t funcr;
if (!ttisfunction(func)) /* `func' is not a function? */
func = tryfuncTM(L, func); /* check the `function' tag method */
funcr = savestack(L, func);
cl = &clvalue(func)->l;
L->ci->savedpc = L->savedpc;
if (!cl->isC) { /* Lua function? prepare its call */
CallInfo *ci;
StkId st, base;
Proto *p = cl->p;
luaD_checkstack(L, p->maxstacksize);
func = restorestack(L, funcr);
if (!p->is_vararg) { /* no varargs? */
base = func + 1;
if (L->top > base + p->numparams)
L->top = base + p->numparams;
}
else { /* vararg function */
int nargs = cast_int(L->top - func) - 1;
base = adjust_varargs(L, p, nargs);
func = restorestack(L, funcr); /* previous call may change the stack */
}
ci = inc_ci(L); /* now `enter' new function */
ci->func = func;
L->base = ci->base = base;
ci->top = L->base + p->maxstacksize;
lua_assert(ci->top <= L->stack_last);
L->savedpc = p->code; /* starting point */
ci->tailcalls = 0;
ci->nresults = nresults;
for (st = L->top; st < ci->top; st++)
setnilvalue(st);
L->top = ci->top;
if (L->hookmask & LUA_MASKCALL) {
L->savedpc++; /* hooks assume 'pc' is already incremented */
luaD_callhook(L, LUA_HOOKCALL, -1);
L->savedpc--; /* correct 'pc' */
}
return PCRLUA;
}
else { /* if is a C function, call it */
CallInfo *ci;
int n;
luaD_checkstack(L, LUA_MINSTACK); /* ensure minimum stack size */
ci = inc_ci(L); /* now `enter' new function */
ci->func = restorestack(L, funcr);
L->base = ci->base = ci->func + 1;
ci->top = L->top + LUA_MINSTACK;
lua_assert(ci->top <= L->stack_last);
ci->nresults = nresults;
if (L->hookmask & LUA_MASKCALL)
luaD_callhook(L, LUA_HOOKCALL, -1);
lua_unlock(L);
n = (*curr_func(L)->c.f)(L); /* do the actual call */
lua_lock(L);
if (n < 0) /* yielding? */
return PCRYIELD;
else {
luaD_poscall(L, L->top - n);
return PCRC;
}
}
}
static StkId callrethooks (lua_State *L, StkId firstResult) {
ptrdiff_t fr = savestack(L, firstResult); /* next call may change stack */
luaD_callhook(L, LUA_HOOKRET, -1);
if (f_isLua(L->ci)) { /* Lua function? */
while ((L->hookmask & LUA_MASKRET) && L->ci->tailcalls--) /* tail calls */
luaD_callhook(L, LUA_HOOKTAILRET, -1);
}
return restorestack(L, fr);
}
int luaD_poscall (lua_State *L, StkId firstResult) {
StkId res;
int wanted, i;
CallInfo *ci;
if (L->hookmask & LUA_MASKRET)
firstResult = callrethooks(L, firstResult);
ci = L->ci--;
res = ci->func; /* res == final position of 1st result */
wanted = ci->nresults;
L->base = (ci - 1)->base; /* restore base */
L->savedpc = (ci - 1)->savedpc; /* restore savedpc */
/* move results to correct place */
for (i = wanted; i != 0 && firstResult < L->top; i--)
setobjs2s(L, res++, firstResult++);
while (i-- > 0)
setnilvalue(res++);
L->top = res;
return (wanted - LUA_MULTRET); /* 0 iff wanted == LUA_MULTRET */
}
/*
** 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) {
if (++L->nCcalls >= LUAI_MAXCCALLS) {
if (L->nCcalls == LUAI_MAXCCALLS)
luaG_runerror(L, "C stack overflow");
else if (L->nCcalls >= (LUAI_MAXCCALLS + (LUAI_MAXCCALLS>>3)))
luaD_throw(L, LUA_ERRERR); /* error while handing stack error */
}
if (luaD_precall(L, func, nResults) == PCRLUA) /* is a Lua function? */
luaV_execute(L, 1); /* call it */
L->nCcalls--;
luaC_checkGC(L);
}
static void resume (lua_State *L, void *ud) {
StkId firstArg = cast(StkId, ud);
CallInfo *ci = L->ci;
if (L->status == 0) { /* start coroutine? */
lua_assert(ci == L->base_ci && firstArg > L->base);
if (luaD_precall(L, firstArg - 1, LUA_MULTRET) != PCRLUA)
return;
}
else { /* resuming from previous yield */
lua_assert(L->status == LUA_YIELD);
L->status = 0;
if (!f_isLua(ci)) { /* `common' yield? */
/* finish interrupted execution of `OP_CALL' */
lua_assert(GET_OPCODE(*((ci-1)->savedpc - 1)) == OP_CALL ||
GET_OPCODE(*((ci-1)->savedpc - 1)) == OP_TAILCALL);
if (luaD_poscall(L, firstArg)) /* complete it... */
L->top = L->ci->top; /* and correct top if not multiple results */
}
else /* yielded inside a hook: just continue its execution */
L->base = L->ci->base;
}
luaV_execute(L, cast_int(L->ci - L->base_ci));
}
static int resume_error (lua_State *L, const char *msg) {
L->top = L->ci->base;
setsvalue2s(L, L->top, luaS_new(L, msg));
incr_top(L);
lua_unlock(L);
return LUA_ERRRUN;
}
LUA_API int lua_resume (lua_State *L, int nargs) {
int status;
lua_lock(L);
if (L->status != LUA_YIELD && (L->status != 0 || L->ci != L->base_ci))
return resume_error(L, "cannot resume non-suspended coroutine");
if (L->nCcalls >= LUAI_MAXCCALLS)
return resume_error(L, "C stack overflow");
luai_userstateresume(L, nargs);
lua_assert(L->errfunc == 0);
L->baseCcalls = ++L->nCcalls;
status = luaD_rawrunprotected(L, resume, L->top - nargs);
if (status != 0) { /* error? */
L->status = cast_byte(status); /* mark thread as `dead' */
luaD_seterrorobj(L, status, L->top);
L->ci->top = L->top;
}
else {
lua_assert(L->nCcalls == L->baseCcalls);
status = L->status;
}
--L->nCcalls;
lua_unlock(L);
return status;
}
LUA_API int lua_yield (lua_State *L, int nresults) {
luai_userstateyield(L, nresults);
lua_lock(L);
if (L->nCcalls > L->baseCcalls)
luaG_runerror(L, "attempt to yield across metamethod/C-call boundary");
L->base = L->top - nresults; /* protect stack slots below */
L->status = LUA_YIELD;
lua_unlock(L);
return -1;
}
int luaD_pcall (lua_State *L, Pfunc func, void *u,
ptrdiff_t old_top, ptrdiff_t ef) {
int status;
unsigned short oldnCcalls = L->nCcalls;
ptrdiff_t old_ci = saveci(L, L->ci);
lu_byte old_allowhooks = L->allowhook;
ptrdiff_t old_errfunc = L->errfunc;
L->errfunc = ef;
status = luaD_rawrunprotected(L, func, u);
if (status != 0) { /* an error occurred? */
StkId oldtop = restorestack(L, old_top);
luaF_close(L, oldtop); /* close eventual pending closures */
luaD_seterrorobj(L, status, oldtop);
L->nCcalls = oldnCcalls;
L->ci = restoreci(L, old_ci);
L->base = L->ci->base;
L->savedpc = L->ci->savedpc;
L->allowhook = old_allowhooks;
restore_stack_limit(L);
}
L->errfunc = old_errfunc;
return status;
}
/*
** Execute a protected parser.
*/
struct SParser { /* data to `f_parser' */
ZIO *z;
Mbuffer buff; /* buffer to be used by the scanner */
const char *name;
};
static void f_parser (lua_State *L, void *ud) {
int i;
Proto *tf;
Closure *cl;
struct SParser *p = cast(struct SParser *, ud);
int c = luaZ_lookahead(p->z);
luaC_checkGC(L);
tf = ((c == LUA_SIGNATURE[0]) ? luaU_undump : luaY_parser)(L, p->z,
&p->buff, p->name);
cl = luaF_newLclosure(L, tf->nups, hvalue(gt(L)));
cl->l.p = tf;
for (i = 0; i < tf->nups; i++) /* initialize eventual upvalues */
cl->l.upvals[i] = luaF_newupval(L);
setclvalue(L, L->top, cl);
incr_top(L);
}
int luaD_protectedparser (lua_State *L, ZIO *z, const char *name) {
struct SParser p;
int status;
p.z = z; p.name = name;
luaZ_initbuffer(L, &p.buff);
status = luaD_pcall(L, f_parser, &p, savestack(L, L->top), L->errfunc);
luaZ_freebuffer(L, &p.buff);
return status;
}

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/*
** $Id: ldo.h,v 2.7.1.1 2007/12/27 13:02:25 roberto Exp $
** 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"
#define luaD_checkstack(L,n) \
if ((char *)L->stack_last - (char *)L->top <= (n)*(int)sizeof(TValue)) \
luaD_growstack(L, n); \
else condhardstacktests(luaD_reallocstack(L, L->stacksize - EXTRA_STACK - 1));
#define incr_top(L) {luaD_checkstack(L,1); L->top++;}
#define savestack(L,p) ((char *)(p) - (char *)L->stack)
#define restorestack(L,n) ((TValue *)((char *)L->stack + (n)))
#define saveci(L,p) ((char *)(p) - (char *)L->base_ci)
#define restoreci(L,n) ((CallInfo *)((char *)L->base_ci + (n)))
/* results from luaD_precall */
#define PCRLUA 0 /* initiated a call to a Lua function */
#define PCRC 1 /* did a call to a C function */
#define PCRYIELD 2 /* C funtion yielded */
/* type of protected functions, to be ran by `runprotected' */
typedef void (*Pfunc) (lua_State *L, void *ud);
LUAI_FUNC int luaD_protectedparser (lua_State *L, ZIO *z, const char *name);
LUAI_FUNC void luaD_callhook (lua_State *L, int event, int line);
LUAI_FUNC int luaD_precall (lua_State *L, StkId func, int nresults);
LUAI_FUNC void luaD_call (lua_State *L, StkId func, int nResults);
LUAI_FUNC int luaD_pcall (lua_State *L, Pfunc func, void *u,
ptrdiff_t oldtop, ptrdiff_t ef);
LUAI_FUNC int luaD_poscall (lua_State *L, StkId firstResult);
LUAI_FUNC void luaD_reallocCI (lua_State *L, int newsize);
LUAI_FUNC void luaD_reallocstack (lua_State *L, int newsize);
LUAI_FUNC void luaD_growstack (lua_State *L, int n);
LUAI_FUNC void luaD_throw (lua_State *L, int errcode);
LUAI_FUNC int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud);
LUAI_FUNC void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop);
#endif

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/*
** $Id: ldump.c,v 2.8.1.1 2007/12/27 13:02:25 roberto Exp $
** save precompiled Lua chunks
** See Copyright Notice in lua.h
*/
#include <stddef.h>
#define ldump_c
#define LUA_CORE
#include "lua.h"
#include "lobject.h"
#include "lstate.h"
#include "lundump.h"
typedef struct {
lua_State* L;
lua_Writer writer;
void* data;
int strip;
int status;
} DumpState;
#define DumpMem(b,n,size,D) DumpBlock(b,(n)*(size),D)
#define DumpVar(x,D) DumpMem(&x,1,sizeof(x),D)
static void DumpBlock(const void* b, size_t size, DumpState* D)
{
if (D->status==0)
{
lua_unlock(D->L);
D->status=(*D->writer)(D->L,b,size,D->data);
lua_lock(D->L);
}
}
static void DumpChar(int y, DumpState* D)
{
char x=(char)y;
DumpVar(x,D);
}
static void DumpInt(int x, DumpState* D)
{
DumpVar(x,D);
}
static void DumpNumber(lua_Number x, DumpState* D)
{
DumpVar(x,D);
}
static void DumpVector(const void* b, int n, size_t size, DumpState* D)
{
DumpInt(n,D);
DumpMem(b,n,size,D);
}
static void DumpString(const TString* s, DumpState* D)
{
if (s==NULL || getstr(s)==NULL)
{
size_t size=0;
DumpVar(size,D);
}
else
{
size_t size=s->tsv.len+1; /* include trailing '\0' */
DumpVar(size,D);
DumpBlock(getstr(s),size,D);
}
}
#define DumpCode(f,D) DumpVector(f->code,f->sizecode,sizeof(Instruction),D)
static void DumpFunction(const Proto* f, const TString* p, DumpState* D);
static void DumpConstants(const Proto* f, DumpState* D)
{
int i,n=f->sizek;
DumpInt(n,D);
for (i=0; i<n; i++)
{
const TValue* o=&f->k[i];
DumpChar(ttype(o),D);
switch (ttype(o))
{
case LUA_TNIL:
break;
case LUA_TBOOLEAN:
DumpChar(bvalue(o),D);
break;
case LUA_TNUMBER:
DumpNumber(nvalue(o),D);
break;
case LUA_TSTRING:
DumpString(rawtsvalue(o),D);
break;
default:
lua_assert(0); /* cannot happen */
break;
}
}
n=f->sizep;
DumpInt(n,D);
for (i=0; i<n; i++) DumpFunction(f->p[i],f->source,D);
}
static void DumpDebug(const Proto* f, DumpState* D)
{
int i,n;
n= (D->strip) ? 0 : f->sizelineinfo;
DumpVector(f->lineinfo,n,sizeof(int),D);
n= (D->strip) ? 0 : f->sizelocvars;
DumpInt(n,D);
for (i=0; i<n; i++)
{
DumpString(f->locvars[i].varname,D);
DumpInt(f->locvars[i].startpc,D);
DumpInt(f->locvars[i].endpc,D);
}
n= (D->strip) ? 0 : f->sizeupvalues;
DumpInt(n,D);
for (i=0; i<n; i++) DumpString(f->upvalues[i],D);
}
static void DumpFunction(const Proto* f, const TString* p, DumpState* D)
{
DumpString((f->source==p || D->strip) ? NULL : f->source,D);
DumpInt(f->linedefined,D);
DumpInt(f->lastlinedefined,D);
DumpChar(f->nups,D);
DumpChar(f->numparams,D);
DumpChar(f->is_vararg,D);
DumpChar(f->maxstacksize,D);
DumpCode(f,D);
DumpConstants(f,D);
DumpDebug(f,D);
}
static void DumpHeader(DumpState* D)
{
char h[LUAC_HEADERSIZE];
luaU_header(h);
DumpBlock(h,LUAC_HEADERSIZE,D);
}
/*
** 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);
DumpFunction(f,NULL,&D);
return D.status;
}

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/*
** $Id: lfunc.c,v 2.12.1.2 2007/12/28 14:58:43 roberto Exp $
** Auxiliary functions to manipulate prototypes and closures
** See Copyright Notice in lua.h
*/
#include <stddef.h>
#define lfunc_c
#define LUA_CORE
#include "lua.h"
#include "lfunc.h"
#include "lgc.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
Closure *luaF_newCclosure (lua_State *L, int nelems, Table *e) {
Closure *c = cast(Closure *, luaM_malloc(L, sizeCclosure(nelems)));
luaC_link(L, obj2gco(c), LUA_TFUNCTION);
c->c.isC = 1;
c->c.env = e;
c->c.nupvalues = cast_byte(nelems);
return c;
}
Closure *luaF_newLclosure (lua_State *L, int nelems, Table *e) {
Closure *c = cast(Closure *, luaM_malloc(L, sizeLclosure(nelems)));
luaC_link(L, obj2gco(c), LUA_TFUNCTION);
c->l.isC = 0;
c->l.env = e;
c->l.nupvalues = cast_byte(nelems);
while (nelems--) c->l.upvals[nelems] = NULL;
return c;
}
UpVal *luaF_newupval (lua_State *L) {
UpVal *uv = luaM_new(L, UpVal);
luaC_link(L, obj2gco(uv), LUA_TUPVAL);
uv->v = &uv->u.value;
setnilvalue(uv->v);
return uv;
}
UpVal *luaF_findupval (lua_State *L, StkId level) {
global_State *g = G(L);
GCObject **pp = &L->openupval;
UpVal *p;
UpVal *uv;
while (*pp != NULL && (p = ngcotouv(*pp))->v >= level) {
lua_assert(p->v != &p->u.value);
if (p->v == level) { /* found a corresponding upvalue? */
if (isdead(g, obj2gco(p))) /* is it dead? */
changewhite(obj2gco(p)); /* ressurect it */
return p;
}
pp = &p->next;
}
uv = luaM_new(L, UpVal); /* not found: create a new one */
uv->tt = LUA_TUPVAL;
uv->marked = luaC_white(g);
uv->v = level; /* current value lives in the stack */
uv->next = *pp; /* chain it in the proper position */
*pp = obj2gco(uv);
uv->u.l.prev = &g->uvhead; /* double link it in `uvhead' list */
uv->u.l.next = g->uvhead.u.l.next;
uv->u.l.next->u.l.prev = uv;
g->uvhead.u.l.next = uv;
lua_assert(uv->u.l.next->u.l.prev == uv && uv->u.l.prev->u.l.next == uv);
return uv;
}
static void unlinkupval (UpVal *uv) {
lua_assert(uv->u.l.next->u.l.prev == uv && uv->u.l.prev->u.l.next == uv);
uv->u.l.next->u.l.prev = uv->u.l.prev; /* remove from `uvhead' list */
uv->u.l.prev->u.l.next = uv->u.l.next;
}
void luaF_freeupval (lua_State *L, UpVal *uv) {
if (uv->v != &uv->u.value) /* is it open? */
unlinkupval(uv); /* remove from open list */
luaM_free(L, uv); /* free upvalue */
}
void luaF_close (lua_State *L, StkId level) {
UpVal *uv;
global_State *g = G(L);
while (L->openupval != NULL && (uv = ngcotouv(L->openupval))->v >= level) {
GCObject *o = obj2gco(uv);
lua_assert(!isblack(o) && uv->v != &uv->u.value);
L->openupval = uv->next; /* remove from `open' list */
if (isdead(g, o))
luaF_freeupval(L, uv); /* free upvalue */
else {
unlinkupval(uv);
setobj(L, &uv->u.value, uv->v);
uv->v = &uv->u.value; /* now current value lives here */
luaC_linkupval(L, uv); /* link upvalue into `gcroot' list */
}
}
}
Proto *luaF_newproto (lua_State *L) {
Proto *f = luaM_new(L, Proto);
luaC_link(L, obj2gco(f), LUA_TPROTO);
f->k = NULL;
f->sizek = 0;
f->p = NULL;
f->sizep = 0;
f->code = NULL;
f->sizecode = 0;
f->sizelineinfo = 0;
f->sizeupvalues = 0;
f->nups = 0;
f->upvalues = NULL;
f->numparams = 0;
f->is_vararg = 0;
f->maxstacksize = 0;
f->lineinfo = NULL;
f->sizelocvars = 0;
f->locvars = NULL;
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, Instruction);
luaM_freearray(L, f->p, f->sizep, Proto *);
luaM_freearray(L, f->k, f->sizek, TValue);
luaM_freearray(L, f->lineinfo, f->sizelineinfo, int);
luaM_freearray(L, f->locvars, f->sizelocvars, struct LocVar);
luaM_freearray(L, f->upvalues, f->sizeupvalues, TString *);
luaM_free(L, f);
}
void luaF_freeclosure (lua_State *L, Closure *c) {
int size = (c->c.isC) ? sizeCclosure(c->c.nupvalues) :
sizeLclosure(c->l.nupvalues);
luaM_freemem(L, c, size);
}
/*
** 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 */
}

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/*
** $Id: lfunc.h,v 2.4.1.1 2007/12/27 13:02:25 roberto Exp $
** Auxiliary functions to manipulate prototypes and closures
** See Copyright Notice in lua.h
*/
#ifndef lfunc_h
#define lfunc_h
#include "lobject.h"
#define sizeCclosure(n) (cast(int, sizeof(CClosure)) + \
cast(int, sizeof(TValue)*((n)-1)))
#define sizeLclosure(n) (cast(int, sizeof(LClosure)) + \
cast(int, sizeof(TValue *)*((n)-1)))
LUAI_FUNC Proto *luaF_newproto (lua_State *L);
LUAI_FUNC Closure *luaF_newCclosure (lua_State *L, int nelems, Table *e);
LUAI_FUNC Closure *luaF_newLclosure (lua_State *L, int nelems, Table *e);
LUAI_FUNC UpVal *luaF_newupval (lua_State *L);
LUAI_FUNC UpVal *luaF_findupval (lua_State *L, StkId level);
LUAI_FUNC void luaF_close (lua_State *L, StkId level);
LUAI_FUNC void luaF_freeproto (lua_State *L, Proto *f);
LUAI_FUNC void luaF_freeclosure (lua_State *L, Closure *c);
LUAI_FUNC void luaF_freeupval (lua_State *L, UpVal *uv);
LUAI_FUNC const char *luaF_getlocalname (const Proto *func, int local_number,
int pc);
#endif

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/*
** $Id: lgc.c,v 2.38.1.2 2011/03/18 18:05:38 roberto Exp $
** Garbage Collector
** See Copyright Notice in lua.h
*/
#include <string.h>
#define lgc_c
#define LUA_CORE
#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"
#define GCSTEPSIZE 1024u
#define GCSWEEPMAX 40
#define GCSWEEPCOST 10
#define GCFINALIZECOST 100
#define maskmarks cast_byte(~(bitmask(BLACKBIT)|WHITEBITS))
#define makewhite(g,x) \
((x)->gch.marked = cast_byte(((x)->gch.marked & maskmarks) | luaC_white(g)))
#define white2gray(x) reset2bits((x)->gch.marked, WHITE0BIT, WHITE1BIT)
#define black2gray(x) resetbit((x)->gch.marked, BLACKBIT)
#define stringmark(s) reset2bits((s)->tsv.marked, WHITE0BIT, WHITE1BIT)
#define isfinalized(u) testbit((u)->marked, FINALIZEDBIT)
#define markfinalized(u) l_setbit((u)->marked, FINALIZEDBIT)
#define KEYWEAK bitmask(KEYWEAKBIT)
#define VALUEWEAK bitmask(VALUEWEAKBIT)
#define markvalue(g,o) { checkconsistency(o); \
if (iscollectable(o) && iswhite(gcvalue(o))) reallymarkobject(g,gcvalue(o)); }
#define markobject(g,t) { if (iswhite(obj2gco(t))) \
reallymarkobject(g, obj2gco(t)); }
#define setthreshold(g) (g->GCthreshold = (g->estimate/100) * g->gcpause)
static void removeentry (Node *n) {
lua_assert(ttisnil(gval(n)));
if (iscollectable(gkey(n)))
setttype(gkey(n), LUA_TDEADKEY); /* dead key; remove it */
}
static void reallymarkobject (global_State *g, GCObject *o) {
lua_assert(iswhite(o) && !isdead(g, o));
white2gray(o);
switch (o->gch.tt) {
case LUA_TSTRING: {
return;
}
case LUA_TUSERDATA: {
Table *mt = gco2u(o)->metatable;
gray2black(o); /* udata are never gray */
if (mt) markobject(g, mt);
markobject(g, gco2u(o)->env);
return;
}
case LUA_TUPVAL: {
UpVal *uv = gco2uv(o);
markvalue(g, uv->v);
if (uv->v == &uv->u.value) /* closed? */
gray2black(o); /* open upvalues are never black */
return;
}
case LUA_TFUNCTION: {
gco2cl(o)->c.gclist = g->gray;
g->gray = o;
break;
}
case LUA_TTABLE: {
gco2h(o)->gclist = g->gray;
g->gray = o;
break;
}
case LUA_TTHREAD: {
gco2th(o)->gclist = g->gray;
g->gray = o;
break;
}
case LUA_TPROTO: {
gco2p(o)->gclist = g->gray;
g->gray = o;
break;
}
default: lua_assert(0);
}
}
static void marktmu (global_State *g) {
GCObject *u = g->tmudata;
if (u) {
do {
u = u->gch.next;
makewhite(g, u); /* may be marked, if left from previous GC */
reallymarkobject(g, u);
} while (u != g->tmudata);
}
}
/* move `dead' udata that need finalization to list `tmudata' */
size_t luaC_separateudata (lua_State *L, int all) {
global_State *g = G(L);
size_t deadmem = 0;
GCObject **p = &g->mainthread->next;
GCObject *curr;
while ((curr = *p) != NULL) {
if (!(iswhite(curr) || all) || isfinalized(gco2u(curr)))
p = &curr->gch.next; /* don't bother with them */
else if (fasttm(L, gco2u(curr)->metatable, TM_GC) == NULL) {
markfinalized(gco2u(curr)); /* don't need finalization */
p = &curr->gch.next;
}
else { /* must call its gc method */
deadmem += sizeudata(gco2u(curr));
markfinalized(gco2u(curr));
*p = curr->gch.next;
/* link `curr' at the end of `tmudata' list */
if (g->tmudata == NULL) /* list is empty? */
g->tmudata = curr->gch.next = curr; /* creates a circular list */
else {
curr->gch.next = g->tmudata->gch.next;
g->tmudata->gch.next = curr;
g->tmudata = curr;
}
}
}
return deadmem;
}
static int traversetable (global_State *g, Table *h) {
int i;
int weakkey = 0;
int weakvalue = 0;
const TValue *mode;
if (h->metatable)
markobject(g, h->metatable);
mode = gfasttm(g, h->metatable, TM_MODE);
if (mode && ttisstring(mode)) { /* is there a weak mode? */
weakkey = (strchr(svalue(mode), 'k') != NULL);
weakvalue = (strchr(svalue(mode), 'v') != NULL);
if (weakkey || weakvalue) { /* is really weak? */
h->marked &= ~(KEYWEAK | VALUEWEAK); /* clear bits */
h->marked |= cast_byte((weakkey << KEYWEAKBIT) |
(weakvalue << VALUEWEAKBIT));
h->gclist = g->weak; /* must be cleared after GC, ... */
g->weak = obj2gco(h); /* ... so put in the appropriate list */
}
}
if (weakkey && weakvalue) return 1;
if (!weakvalue) {
i = h->sizearray;
while (i--)
markvalue(g, &h->array[i]);
}
i = sizenode(h);
while (i--) {
Node *n = gnode(h, i);
lua_assert(ttype(gkey(n)) != LUA_TDEADKEY || ttisnil(gval(n)));
if (ttisnil(gval(n)))
removeentry(n); /* remove empty entries */
else {
lua_assert(!ttisnil(gkey(n)));
if (!weakkey) markvalue(g, gkey(n));
if (!weakvalue) markvalue(g, gval(n));
}
}
return weakkey || weakvalue;
}
/*
** All marks are conditional because a GC may happen while the
** prototype is still being created
*/
static void traverseproto (global_State *g, Proto *f) {
int i;
if (f->source) stringmark(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 */
if (f->upvalues[i])
stringmark(f->upvalues[i]);
}
for (i=0; i<f->sizep; i++) { /* mark nested protos */
if (f->p[i])
markobject(g, f->p[i]);
}
for (i=0; i<f->sizelocvars; i++) { /* mark local-variable names */
if (f->locvars[i].varname)
stringmark(f->locvars[i].varname);
}
}
static void traverseclosure (global_State *g, Closure *cl) {
markobject(g, cl->c.env);
if (cl->c.isC) {
int i;
for (i=0; i<cl->c.nupvalues; i++) /* mark its upvalues */
markvalue(g, &cl->c.upvalue[i]);
}
else {
int i;
lua_assert(cl->l.nupvalues == cl->l.p->nups);
markobject(g, cl->l.p);
for (i=0; i<cl->l.nupvalues; i++) /* mark its upvalues */
markobject(g, cl->l.upvals[i]);
}
}
static void checkstacksizes (lua_State *L, StkId max) {
int ci_used = cast_int(L->ci - L->base_ci); /* number of `ci' in use */
int s_used = cast_int(max - L->stack); /* part of stack in use */
if (L->size_ci > LUAI_MAXCALLS) /* handling overflow? */
return; /* do not touch the stacks */
if (4*ci_used < L->size_ci && 2*BASIC_CI_SIZE < L->size_ci)
luaD_reallocCI(L, L->size_ci/2); /* still big enough... */
condhardstacktests(luaD_reallocCI(L, ci_used + 1));
if (4*s_used < L->stacksize &&
2*(BASIC_STACK_SIZE+EXTRA_STACK) < L->stacksize)
luaD_reallocstack(L, L->stacksize/2); /* still big enough... */
condhardstacktests(luaD_reallocstack(L, s_used));
}
static void traversestack (global_State *g, lua_State *l) {
StkId o, lim;
CallInfo *ci;
markvalue(g, gt(l));
lim = l->top;
for (ci = l->base_ci; ci <= l->ci; ci++) {
lua_assert(ci->top <= l->stack_last);
if (lim < ci->top) lim = ci->top;
}
for (o = l->stack; o < l->top; o++)
markvalue(g, o);
for (; o <= lim; o++)
setnilvalue(o);
checkstacksizes(l, lim);
}
/*
** traverse one gray object, turning it to black.
** Returns `quantity' traversed.
*/
static l_mem propagatemark (global_State *g) {
GCObject *o = g->gray;
lua_assert(isgray(o));
gray2black(o);
switch (o->gch.tt) {
case LUA_TTABLE: {
Table *h = gco2h(o);
g->gray = h->gclist;
if (traversetable(g, h)) /* table is weak? */
black2gray(o); /* keep it gray */
return sizeof(Table) + sizeof(TValue) * h->sizearray +
sizeof(Node) * sizenode(h);
}
case LUA_TFUNCTION: {
Closure *cl = gco2cl(o);
g->gray = cl->c.gclist;
traverseclosure(g, cl);
return (cl->c.isC) ? sizeCclosure(cl->c.nupvalues) :
sizeLclosure(cl->l.nupvalues);
}
case LUA_TTHREAD: {
lua_State *th = gco2th(o);
g->gray = th->gclist;
th->gclist = g->grayagain;
g->grayagain = o;
black2gray(o);
traversestack(g, th);
return sizeof(lua_State) + sizeof(TValue) * th->stacksize +
sizeof(CallInfo) * th->size_ci;
}
case LUA_TPROTO: {
Proto *p = gco2p(o);
g->gray = p->gclist;
traverseproto(g, p);
return sizeof(Proto) + sizeof(Instruction) * p->sizecode +
sizeof(Proto *) * p->sizep +
sizeof(TValue) * p->sizek +
sizeof(int) * p->sizelineinfo +
sizeof(LocVar) * p->sizelocvars +
sizeof(TString *) * p->sizeupvalues;
}
default: lua_assert(0); return 0;
}
}
static size_t propagateall (global_State *g) {
size_t m = 0;
while (g->gray) m += propagatemark(g);
return m;
}
/*
** The next function 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 userdata
** being finalized, keep them in keys, but not in values
*/
static int iscleared (const TValue *o, int iskey) {
if (!iscollectable(o)) return 0;
if (ttisstring(o)) {
stringmark(rawtsvalue(o)); /* strings are `values', so are never weak */
return 0;
}
return iswhite(gcvalue(o)) ||
(ttisuserdata(o) && (!iskey && isfinalized(uvalue(o))));
}
/*
** clear collected entries from weaktables
*/
static void cleartable (GCObject *l) {
while (l) {
Table *h = gco2h(l);
int i = h->sizearray;
lua_assert(testbit(h->marked, VALUEWEAKBIT) ||
testbit(h->marked, KEYWEAKBIT));
if (testbit(h->marked, VALUEWEAKBIT)) {
while (i--) {
TValue *o = &h->array[i];
if (iscleared(o, 0)) /* value was collected? */
setnilvalue(o); /* remove value */
}
}
i = sizenode(h);
while (i--) {
Node *n = gnode(h, i);
if (!ttisnil(gval(n)) && /* non-empty entry? */
(iscleared(key2tval(n), 1) || iscleared(gval(n), 0))) {
setnilvalue(gval(n)); /* remove value ... */
removeentry(n); /* remove entry from table */
}
}
l = h->gclist;
}
}
static void freeobj (lua_State *L, GCObject *o) {
switch (o->gch.tt) {
case LUA_TPROTO: luaF_freeproto(L, gco2p(o)); break;
case LUA_TFUNCTION: luaF_freeclosure(L, gco2cl(o)); break;
case LUA_TUPVAL: luaF_freeupval(L, gco2uv(o)); break;
case LUA_TTABLE: luaH_free(L, gco2h(o)); break;
case LUA_TTHREAD: {
lua_assert(gco2th(o) != L && gco2th(o) != G(L)->mainthread);
luaE_freethread(L, gco2th(o));
break;
}
case LUA_TSTRING: {
G(L)->strt.nuse--;
luaM_freemem(L, o, sizestring(gco2ts(o)));
break;
}
case LUA_TUSERDATA: {
luaM_freemem(L, o, sizeudata(gco2u(o)));
break;
}
default: lua_assert(0);
}
}
#define sweepwholelist(L,p) sweeplist(L,p,MAX_LUMEM)
static GCObject **sweeplist (lua_State *L, GCObject **p, lu_mem count) {
GCObject *curr;
global_State *g = G(L);
int deadmask = otherwhite(g);
while ((curr = *p) != NULL && count-- > 0) {
if (curr->gch.tt == LUA_TTHREAD) /* sweep open upvalues of each thread */
sweepwholelist(L, &gco2th(curr)->openupval);
if ((curr->gch.marked ^ WHITEBITS) & deadmask) { /* not dead? */
lua_assert(!isdead(g, curr) || testbit(curr->gch.marked, FIXEDBIT));
makewhite(g, curr); /* make it white (for next cycle) */
p = &curr->gch.next;
}
else { /* must erase `curr' */
lua_assert(isdead(g, curr) || deadmask == bitmask(SFIXEDBIT));
*p = curr->gch.next;
if (curr == g->rootgc) /* is the first element of the list? */
g->rootgc = curr->gch.next; /* adjust first */
freeobj(L, curr);
}
}
return p;
}
static void checkSizes (lua_State *L) {
global_State *g = G(L);
/* check size of string hash */
if (g->strt.nuse < cast(lu_int32, g->strt.size/4) &&
g->strt.size > MINSTRTABSIZE*2)
luaS_resize(L, g->strt.size/2); /* table is too big */
/* check size of buffer */
if (luaZ_sizebuffer(&g->buff) > LUA_MINBUFFER*2) { /* buffer too big? */
size_t newsize = luaZ_sizebuffer(&g->buff) / 2;
luaZ_resizebuffer(L, &g->buff, newsize);
}
}
static void GCTM (lua_State *L) {
global_State *g = G(L);
GCObject *o = g->tmudata->gch.next; /* get first element */
Udata *udata = rawgco2u(o);
const TValue *tm;
/* remove udata from `tmudata' */
if (o == g->tmudata) /* last element? */
g->tmudata = NULL;
else
g->tmudata->gch.next = udata->uv.next;
udata->uv.next = g->mainthread->next; /* return it to `root' list */
g->mainthread->next = o;
makewhite(g, o);
tm = fasttm(L, udata->uv.metatable, TM_GC);
if (tm != NULL) {
lu_byte oldah = L->allowhook;
lu_mem oldt = g->GCthreshold;
L->allowhook = 0; /* stop debug hooks during GC tag method */
g->GCthreshold = 2*g->totalbytes; /* avoid GC steps */
setobj2s(L, L->top, tm);
setuvalue(L, L->top+1, udata);
L->top += 2;
luaD_call(L, L->top - 2, 0);
L->allowhook = oldah; /* restore hooks */
g->GCthreshold = oldt; /* restore threshold */
}
}
/*
** Call all GC tag methods
*/
void luaC_callGCTM (lua_State *L) {
while (G(L)->tmudata)
GCTM(L);
}
void luaC_freeall (lua_State *L) {
global_State *g = G(L);
int i;
g->currentwhite = WHITEBITS | bitmask(SFIXEDBIT); /* mask to collect all elements */
sweepwholelist(L, &g->rootgc);
for (i = 0; i < g->strt.size; i++) /* free all string lists */
sweepwholelist(L, &g->strt.hash[i]);
}
static void markmt (global_State *g) {
int i;
for (i=0; i<NUM_TAGS; i++)
if (g->mt[i]) markobject(g, g->mt[i]);
}
/* mark root set */
static void markroot (lua_State *L) {
global_State *g = G(L);
g->gray = NULL;
g->grayagain = NULL;
g->weak = NULL;
markobject(g, g->mainthread);
/* make global table be traversed before main stack */
markvalue(g, gt(g->mainthread));
markvalue(g, registry(L));
markmt(g);
g->gcstate = GCSpropagate;
}
static void remarkupvals (global_State *g) {
UpVal *uv;
for (uv = g->uvhead.u.l.next; uv != &g->uvhead; uv = uv->u.l.next) {
lua_assert(uv->u.l.next->u.l.prev == uv && uv->u.l.prev->u.l.next == uv);
if (isgray(obj2gco(uv)))
markvalue(g, uv->v);
}
}
static void atomic (lua_State *L) {
global_State *g = G(L);
size_t udsize; /* total size of userdata to be finalized */
/* remark occasional upvalues of (maybe) dead threads */
remarkupvals(g);
/* traverse objects cautch by write barrier and by 'remarkupvals' */
propagateall(g);
/* remark weak tables */
g->gray = g->weak;
g->weak = NULL;
lua_assert(!iswhite(obj2gco(g->mainthread)));
markobject(g, L); /* mark running thread */
markmt(g); /* mark basic metatables (again) */
propagateall(g);
/* remark gray again */
g->gray = g->grayagain;
g->grayagain = NULL;
propagateall(g);
udsize = luaC_separateudata(L, 0); /* separate userdata to be finalized */
marktmu(g); /* mark `preserved' userdata */
udsize += propagateall(g); /* remark, to propagate `preserveness' */
cleartable(g->weak); /* remove collected objects from weak tables */
/* flip current white */
g->currentwhite = cast_byte(otherwhite(g));
g->sweepstrgc = 0;
g->sweepgc = &g->rootgc;
g->gcstate = GCSsweepstring;
g->estimate = g->totalbytes - udsize; /* first estimate */
}
static l_mem singlestep (lua_State *L) {
global_State *g = G(L);
/*lua_checkmemory(L);*/
switch (g->gcstate) {
case GCSpause: {
markroot(L); /* start a new collection */
return 0;
}
case GCSpropagate: {
if (g->gray)
return propagatemark(g);
else { /* no more `gray' objects */
atomic(L); /* finish mark phase */
return 0;
}
}
case GCSsweepstring: {
lu_mem old = g->totalbytes;
sweepwholelist(L, &g->strt.hash[g->sweepstrgc++]);
if (g->sweepstrgc >= g->strt.size) /* nothing more to sweep? */
g->gcstate = GCSsweep; /* end sweep-string phase */
lua_assert(old >= g->totalbytes);
g->estimate -= old - g->totalbytes;
return GCSWEEPCOST;
}
case GCSsweep: {
lu_mem old = g->totalbytes;
g->sweepgc = sweeplist(L, g->sweepgc, GCSWEEPMAX);
if (*g->sweepgc == NULL) { /* nothing more to sweep? */
checkSizes(L);
g->gcstate = GCSfinalize; /* end sweep phase */
}
lua_assert(old >= g->totalbytes);
g->estimate -= old - g->totalbytes;
return GCSWEEPMAX*GCSWEEPCOST;
}
case GCSfinalize: {
if (g->tmudata) {
GCTM(L);
if (g->estimate > GCFINALIZECOST)
g->estimate -= GCFINALIZECOST;
return GCFINALIZECOST;
}
else {
g->gcstate = GCSpause; /* end collection */
g->gcdept = 0;
return 0;
}
}
default: lua_assert(0); return 0;
}
}
void luaC_step (lua_State *L) {
global_State *g = G(L);
l_mem lim = (GCSTEPSIZE/100) * g->gcstepmul;
if (lim == 0)
lim = (MAX_LUMEM-1)/2; /* no limit */
g->gcdept += g->totalbytes - g->GCthreshold;
do {
lim -= singlestep(L);
if (g->gcstate == GCSpause)
break;
} while (lim > 0);
if (g->gcstate != GCSpause) {
if (g->gcdept < GCSTEPSIZE)
g->GCthreshold = g->totalbytes + GCSTEPSIZE; /* - lim/g->gcstepmul;*/
else {
g->gcdept -= GCSTEPSIZE;
g->GCthreshold = g->totalbytes;
}
}
else {
setthreshold(g);
}
}
void luaC_fullgc (lua_State *L) {
global_State *g = G(L);
if (g->gcstate <= GCSpropagate) {
/* reset sweep marks to sweep all elements (returning them to white) */
g->sweepstrgc = 0;
g->sweepgc = &g->rootgc;
/* reset other collector lists */
g->gray = NULL;
g->grayagain = NULL;
g->weak = NULL;
g->gcstate = GCSsweepstring;
}
lua_assert(g->gcstate != GCSpause && g->gcstate != GCSpropagate);
/* finish any pending sweep phase */
while (g->gcstate != GCSfinalize) {
lua_assert(g->gcstate == GCSsweepstring || g->gcstate == GCSsweep);
singlestep(L);
}
markroot(L);
while (g->gcstate != GCSpause) {
singlestep(L);
}
setthreshold(g);
}
void luaC_barrierf (lua_State *L, GCObject *o, GCObject *v) {
global_State *g = G(L);
lua_assert(isblack(o) && iswhite(v) && !isdead(g, v) && !isdead(g, o));
lua_assert(g->gcstate != GCSfinalize && g->gcstate != GCSpause);
lua_assert(ttype(&o->gch) != LUA_TTABLE);
/* must keep invariant? */
if (g->gcstate == GCSpropagate)
reallymarkobject(g, v); /* restore invariant */
else /* don't mind */
makewhite(g, o); /* mark as white just to avoid other barriers */
}
void luaC_barrierback (lua_State *L, Table *t) {
global_State *g = G(L);
GCObject *o = obj2gco(t);
lua_assert(isblack(o) && !isdead(g, o));
lua_assert(g->gcstate != GCSfinalize && g->gcstate != GCSpause);
black2gray(o); /* make table gray (again) */
t->gclist = g->grayagain;
g->grayagain = o;
}
void luaC_link (lua_State *L, GCObject *o, lu_byte tt) {
global_State *g = G(L);
o->gch.next = g->rootgc;
g->rootgc = o;
o->gch.marked = luaC_white(g);
o->gch.tt = tt;
}
void luaC_linkupval (lua_State *L, UpVal *uv) {
global_State *g = G(L);
GCObject *o = obj2gco(uv);
o->gch.next = g->rootgc; /* link upvalue into `rootgc' list */
g->rootgc = o;
if (isgray(o)) {
if (g->gcstate == GCSpropagate) {
gray2black(o); /* closed upvalues need barrier */
luaC_barrier(L, uv, uv->v);
}
else { /* sweep phase: sweep it (turning it into white) */
makewhite(g, o);
lua_assert(g->gcstate != GCSfinalize && g->gcstate != GCSpause);
}
}
}

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/*
** $Id: lgc.h,v 2.15.1.1 2007/12/27 13:02:25 roberto Exp $
** Garbage Collector
** See Copyright Notice in lua.h
*/
#ifndef lgc_h
#define lgc_h
#include "lobject.h"
/*
** Possible states of the Garbage Collector
*/
#define GCSpause 0
#define GCSpropagate 1
#define GCSsweepstring 2
#define GCSsweep 3
#define GCSfinalize 4
/*
** some userful bit tricks
*/
#define resetbits(x,m) ((x) &= cast(lu_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))
#define set2bits(x,b1,b2) setbits(x, (bit2mask(b1, b2)))
#define reset2bits(x,b1,b2) resetbits(x, (bit2mask(b1, b2)))
#define test2bits(x,b1,b2) testbits(x, (bit2mask(b1, b2)))
/*
** Layout for bit use in `marked' field:
** bit 0 - object is white (type 0)
** bit 1 - object is white (type 1)
** bit 2 - object is black
** bit 3 - for userdata: has been finalized
** bit 3 - for tables: has weak keys
** bit 4 - for tables: has weak values
** bit 5 - object is fixed (should not be collected)
** bit 6 - object is "super" fixed (only the main thread)
*/
#define WHITE0BIT 0
#define WHITE1BIT 1
#define BLACKBIT 2
#define FINALIZEDBIT 3
#define KEYWEAKBIT 3
#define VALUEWEAKBIT 4
#define FIXEDBIT 5
#define SFIXEDBIT 6
#define WHITEBITS bit2mask(WHITE0BIT, WHITE1BIT)
#define iswhite(x) test2bits((x)->gch.marked, WHITE0BIT, WHITE1BIT)
#define isblack(x) testbit((x)->gch.marked, BLACKBIT)
#define isgray(x) (!isblack(x) && !iswhite(x))
#define otherwhite(g) (g->currentwhite ^ WHITEBITS)
#define isdead(g,v) ((v)->gch.marked & otherwhite(g) & WHITEBITS)
#define changewhite(x) ((x)->gch.marked ^= WHITEBITS)
#define gray2black(x) l_setbit((x)->gch.marked, BLACKBIT)
#define valiswhite(x) (iscollectable(x) && iswhite(gcvalue(x)))
#define luaC_white(g) cast(lu_byte, (g)->currentwhite & WHITEBITS)
#define luaC_checkGC(L) { \
condhardstacktests(luaD_reallocstack(L, L->stacksize - EXTRA_STACK - 1)); \
if (G(L)->totalbytes >= G(L)->GCthreshold) \
luaC_step(L); }
#define luaC_barrier(L,p,v) { if (valiswhite(v) && isblack(obj2gco(p))) \
luaC_barrierf(L,obj2gco(p),gcvalue(v)); }
#define luaC_barriert(L,t,v) { if (valiswhite(v) && isblack(obj2gco(t))) \
luaC_barrierback(L,t); }
#define luaC_objbarrier(L,p,o) \
{ if (iswhite(obj2gco(o)) && isblack(obj2gco(p))) \
luaC_barrierf(L,obj2gco(p),obj2gco(o)); }
#define luaC_objbarriert(L,t,o) \
{ if (iswhite(obj2gco(o)) && isblack(obj2gco(t))) luaC_barrierback(L,t); }
LUAI_FUNC size_t luaC_separateudata (lua_State *L, int all);
LUAI_FUNC void luaC_callGCTM (lua_State *L);
LUAI_FUNC void luaC_freeall (lua_State *L);
LUAI_FUNC void luaC_step (lua_State *L);
LUAI_FUNC void luaC_fullgc (lua_State *L);
LUAI_FUNC void luaC_link (lua_State *L, GCObject *o, lu_byte tt);
LUAI_FUNC void luaC_linkupval (lua_State *L, UpVal *uv);
LUAI_FUNC void luaC_barrierf (lua_State *L, GCObject *o, GCObject *v);
LUAI_FUNC void luaC_barrierback (lua_State *L, Table *t);
#endif

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/*
** $Id: linit.c,v 1.14.1.1 2007/12/27 13:02:25 roberto Exp $
** Initialization of libraries for lua.c
** See Copyright Notice in lua.h
*/
#define linit_c
#define LUA_LIB
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
static const luaL_Reg lualibs[] = {
{"", luaopen_base},
{LUA_LOADLIBNAME, luaopen_package},
{LUA_TABLIBNAME, luaopen_table},
{LUA_IOLIBNAME, luaopen_io},
{LUA_OSLIBNAME, luaopen_os},
{LUA_STRLIBNAME, luaopen_string},
{LUA_MATHLIBNAME, luaopen_math},
{LUA_DBLIBNAME, luaopen_debug},
{NULL, NULL}
};
LUALIB_API void luaL_openlibs (lua_State *L) {
const luaL_Reg *lib = lualibs;
for (; lib->func; lib++) {
lua_pushcfunction(L, lib->func);
lua_pushstring(L, lib->name);
lua_call(L, 1, 0);
}
}

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/*
** $Id: liolib.c,v 2.73.1.4 2010/05/14 15:33:51 roberto Exp $
** Standard I/O (and system) library
** See Copyright Notice in lua.h
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define liolib_c
#define LUA_LIB
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#define IO_INPUT 1
#define IO_OUTPUT 2
static const char *const fnames[] = {"input", "output"};
static int pushresult (lua_State *L, int i, const char *filename) {
int en = errno; /* calls to Lua API may change this value */
if (i) {
lua_pushboolean(L, 1);
return 1;
}
else {
lua_pushnil(L);
if (filename)
lua_pushfstring(L, "%s: %s", filename, strerror(en));
else
lua_pushfstring(L, "%s", strerror(en));
lua_pushinteger(L, en);
return 3;
}
}
static void fileerror (lua_State *L, int arg, const char *filename) {
lua_pushfstring(L, "%s: %s", filename, strerror(errno));
luaL_argerror(L, arg, lua_tostring(L, -1));
}
#define tofilep(L) ((FILE **)luaL_checkudata(L, 1, LUA_FILEHANDLE))
static int io_type (lua_State *L) {
void *ud;
luaL_checkany(L, 1);
ud = lua_touserdata(L, 1);
lua_getfield(L, LUA_REGISTRYINDEX, LUA_FILEHANDLE);
if (ud == NULL || !lua_getmetatable(L, 1) || !lua_rawequal(L, -2, -1))
lua_pushnil(L); /* not a file */
else if (*((FILE **)ud) == NULL)
lua_pushliteral(L, "closed file");
else
lua_pushliteral(L, "file");
return 1;
}
static FILE *tofile (lua_State *L) {
FILE **f = tofilep(L);
if (*f == NULL)
luaL_error(L, "attempt to use a closed file");
return *f;
}
/*
** When creating file handles, always creates a `closed' file handle
** before opening the actual file; so, if there is a memory error, the
** file is not left opened.
*/
static FILE **newfile (lua_State *L) {
FILE **pf = (FILE **)lua_newuserdata(L, sizeof(FILE *));
*pf = NULL; /* file handle is currently `closed' */
luaL_getmetatable(L, LUA_FILEHANDLE);
lua_setmetatable(L, -2);
return pf;
}
/*
** function to (not) close the standard files stdin, stdout, and stderr
*/
static int io_noclose (lua_State *L) {
lua_pushnil(L);
lua_pushliteral(L, "cannot close standard file");
return 2;
}
/*
** function to close 'popen' files
*/
static int io_pclose (lua_State *L) {
FILE **p = tofilep(L);
int ok = lua_pclose(L, *p);
*p = NULL;
return pushresult(L, ok, NULL);
}
/*
** function to close regular files
*/
static int io_fclose (lua_State *L) {
FILE **p = tofilep(L);
int ok = (fclose(*p) == 0);
*p = NULL;
return pushresult(L, ok, NULL);
}
static int aux_close (lua_State *L) {
lua_getfenv(L, 1);
lua_getfield(L, -1, "__close");
return (lua_tocfunction(L, -1))(L);
}
static int io_close (lua_State *L) {
if (lua_isnone(L, 1))
lua_rawgeti(L, LUA_ENVIRONINDEX, IO_OUTPUT);
tofile(L); /* make sure argument is a file */
return aux_close(L);
}
static int io_gc (lua_State *L) {
FILE *f = *tofilep(L);
/* ignore closed files */
if (f != NULL)
aux_close(L);
return 0;
}
static int io_tostring (lua_State *L) {
FILE *f = *tofilep(L);
if (f == NULL)
lua_pushliteral(L, "file (closed)");
else
lua_pushfstring(L, "file (%p)", f);
return 1;
}
static int io_open (lua_State *L) {
const char *filename = luaL_checkstring(L, 1);
const char *mode = luaL_optstring(L, 2, "r");
FILE **pf = newfile(L);
*pf = fopen(filename, mode);
return (*pf == NULL) ? pushresult(L, 0, filename) : 1;
}
/*
** this function has a separated environment, which defines the
** correct __close for 'popen' files
*/
static int io_popen (lua_State *L) {
const char *filename = luaL_checkstring(L, 1);
const char *mode = luaL_optstring(L, 2, "r");
FILE **pf = newfile(L);
*pf = lua_popen(L, filename, mode);
return (*pf == NULL) ? pushresult(L, 0, filename) : 1;
}
static int io_tmpfile (lua_State *L) {
FILE **pf = newfile(L);
*pf = tmpfile();
return (*pf == NULL) ? pushresult(L, 0, NULL) : 1;
}
static FILE *getiofile (lua_State *L, int findex) {
FILE *f;
lua_rawgeti(L, LUA_ENVIRONINDEX, findex);
f = *(FILE **)lua_touserdata(L, -1);
if (f == NULL)
luaL_error(L, "standard %s file is closed", fnames[findex - 1]);
return f;
}
static int g_iofile (lua_State *L, int f, const char *mode) {
if (!lua_isnoneornil(L, 1)) {
const char *filename = lua_tostring(L, 1);
if (filename) {
FILE **pf = newfile(L);
*pf = fopen(filename, mode);
if (*pf == NULL)
fileerror(L, 1, filename);
}
else {
tofile(L); /* check that it's a valid file handle */
lua_pushvalue(L, 1);
}
lua_rawseti(L, LUA_ENVIRONINDEX, f);
}
/* return current value */
lua_rawgeti(L, LUA_ENVIRONINDEX, 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);
static void aux_lines (lua_State *L, int idx, int toclose) {
lua_pushvalue(L, idx);
lua_pushboolean(L, toclose); /* close/not close file when finished */
lua_pushcclosure(L, io_readline, 2);
}
static int f_lines (lua_State *L) {
tofile(L); /* check that it's a valid file handle */
aux_lines(L, 1, 0);
return 1;
}
static int io_lines (lua_State *L) {
if (lua_isnoneornil(L, 1)) { /* no arguments? */
/* will iterate over default input */
lua_rawgeti(L, LUA_ENVIRONINDEX, IO_INPUT);
return f_lines(L);
}
else {
const char *filename = luaL_checkstring(L, 1);
FILE **pf = newfile(L);
*pf = fopen(filename, "r");
if (*pf == NULL)
fileerror(L, 1, filename);
aux_lines(L, lua_gettop(L), 1);
return 1;
}
}
/*
** {======================================================
** READ
** =======================================================
*/
static int read_number (lua_State *L, FILE *f) {
lua_Number d;
if (fscanf(f, LUA_NUMBER_SCAN, &d) == 1) {
lua_pushnumber(L, d);
return 1;
}
else {
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);
lua_pushlstring(L, NULL, 0);
return (c != EOF);
}
static int read_line (lua_State *L, FILE *f) {
luaL_Buffer b;
luaL_buffinit(L, &b);
for (;;) {
size_t l;
char *p = luaL_prepbuffer(&b);
if (fgets(p, LUAL_BUFFERSIZE, f) == NULL) { /* eof? */
luaL_pushresult(&b); /* close buffer */
return (lua_objlen(L, -1) > 0); /* check whether read something */
}
l = strlen(p);
if (l == 0 || p[l-1] != '\n')
luaL_addsize(&b, l);
else {
luaL_addsize(&b, l - 1); /* do not include `eol' */
luaL_pushresult(&b); /* close buffer */
return 1; /* read at least an `eol' */
}
}
}
static int read_chars (lua_State *L, FILE *f, size_t n) {
size_t rlen; /* how much to read */
size_t nr; /* number of chars actually read */
luaL_Buffer b;
luaL_buffinit(L, &b);
rlen = LUAL_BUFFERSIZE; /* try to read that much each time */
do {
char *p = luaL_prepbuffer(&b);
if (rlen > n) rlen = n; /* cannot read more than asked */
nr = fread(p, sizeof(char), rlen, f);
luaL_addsize(&b, nr);
n -= nr; /* still have to read `n' chars */
} while (n > 0 && nr == rlen); /* until end of count or eof */
luaL_pushresult(&b); /* close buffer */
return (n == 0 || lua_objlen(L, -1) > 0);
}
static int g_read (lua_State *L, FILE *f, int first) {
int nargs = lua_gettop(L) - 1;
int success;
int n;
clearerr(f);
if (nargs == 0) { /* no arguments? */
success = read_line(L, f);
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)lua_tointeger(L, n);
success = (l == 0) ? test_eof(L, f) : read_chars(L, f, l);
}
else {
const char *p = lua_tostring(L, n);
luaL_argcheck(L, p && p[0] == '*', n, "invalid option");
switch (p[1]) {
case 'n': /* number */
success = read_number(L, f);
break;
case 'l': /* line */
success = read_line(L, f);
break;
case 'a': /* file */
read_chars(L, f, ~((size_t)0)); /* read MAX_SIZE_T chars */
success = 1; /* always success */
break;
default:
return luaL_argerror(L, n, "invalid format");
}
}
}
}
if (ferror(f))
return pushresult(L, 0, NULL);
if (!success) {
lua_pop(L, 1); /* remove last result */
lua_pushnil(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);
}
static int io_readline (lua_State *L) {
FILE *f = *(FILE **)lua_touserdata(L, lua_upvalueindex(1));
int sucess;
if (f == NULL) /* file is already closed? */
luaL_error(L, "file is already closed");
sucess = read_line(L, f);
if (ferror(f))
return luaL_error(L, "%s", strerror(errno));
if (sucess) return 1;
else { /* EOF */
if (lua_toboolean(L, lua_upvalueindex(2))) { /* generator created file? */
lua_settop(L, 0);
lua_pushvalue(L, lua_upvalueindex(1));
aux_close(L); /* close it */
}
return 0;
}
}
/* }====================================================== */
static int g_write (lua_State *L, FILE *f, int arg) {
int nargs = lua_gettop(L) - 1;
int status = 1;
for (; nargs--; arg++) {
if (lua_type(L, arg) == LUA_TNUMBER) {
/* optimization: could be done exactly as for strings */
status = status &&
fprintf(f, LUA_NUMBER_FMT, lua_tonumber(L, arg)) > 0;
}
else {
size_t l;
const char *s = luaL_checklstring(L, arg, &l);
status = status && (fwrite(s, sizeof(char), l, f) == l);
}
}
return pushresult(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) {
return g_write(L, tofile(L), 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);
long offset = luaL_optlong(L, 3, 0);
op = fseek(f, offset, mode[op]);
if (op)
return pushresult(L, 0, NULL); /* error */
else {
lua_pushinteger(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], sz);
return pushresult(L, res == 0, NULL);
}
static int io_flush (lua_State *L) {
return pushresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
}
static int f_flush (lua_State *L) {
return pushresult(L, fflush(tofile(L)) == 0, NULL);
}
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}
};
static const luaL_Reg flib[] = {
{"close", io_close},
{"flush", f_flush},
{"lines", f_lines},
{"read", f_read},
{"seek", f_seek},
{"setvbuf", f_setvbuf},
{"write", f_write},
{"__gc", io_gc},
{"__tostring", io_tostring},
{NULL, NULL}
};
static void createmeta (lua_State *L) {
luaL_newmetatable(L, LUA_FILEHANDLE); /* create metatable for file handles */
lua_pushvalue(L, -1); /* push metatable */
lua_setfield(L, -2, "__index"); /* metatable.__index = metatable */
luaL_register(L, NULL, flib); /* file methods */
}
static void createstdfile (lua_State *L, FILE *f, int k, const char *fname) {
*newfile(L) = f;
if (k > 0) {
lua_pushvalue(L, -1);
lua_rawseti(L, LUA_ENVIRONINDEX, k);
}
lua_pushvalue(L, -2); /* copy environment */
lua_setfenv(L, -2); /* set it */
lua_setfield(L, -3, fname);
}
static void newfenv (lua_State *L, lua_CFunction cls) {
lua_createtable(L, 0, 1);
lua_pushcfunction(L, cls);
lua_setfield(L, -2, "__close");
}
LUALIB_API int luaopen_io (lua_State *L) {
createmeta(L);
/* create (private) environment (with fields IO_INPUT, IO_OUTPUT, __close) */
newfenv(L, io_fclose);
lua_replace(L, LUA_ENVIRONINDEX);
/* open library */
luaL_register(L, LUA_IOLIBNAME, iolib);
/* create (and set) default files */
newfenv(L, io_noclose); /* close function for default files */
createstdfile(L, stdin, IO_INPUT, "stdin");
createstdfile(L, stdout, IO_OUTPUT, "stdout");
createstdfile(L, stderr, 0, "stderr");
lua_pop(L, 1); /* pop environment for default files */
lua_getfield(L, -1, "popen");
newfenv(L, io_pclose); /* create environment for 'popen' */
lua_setfenv(L, -2); /* set fenv for 'popen' */
lua_pop(L, 1); /* pop 'popen' */
return 1;
}

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/*
** $Id: llex.c,v 2.20.1.2 2009/11/23 14:58:22 roberto Exp $
** Lexical Analyzer
** See Copyright Notice in lua.h
*/
#include <ctype.h>
#include <locale.h>
#include <string.h>
#define llex_c
#define LUA_CORE
#include "lua.h"
#include "ldo.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 */
const char *const luaX_tokens [] = {
"and", "break", "do", "else", "elseif",
"end", "false", "for", "function", "if",
"in", "local", "nil", "not", "or", "repeat",
"return", "then", "true", "until", "while",
"..", "...", "==", ">=", "<=", "~=",
"<number>", "<name>", "<string>", "<eof>",
NULL
};
#define save_and_next(ls) (save(ls, ls->current), next(ls))
static void save (LexState *ls, int c) {
Mbuffer *b = ls->buff;
if (b->n + 1 > b->buffsize) {
size_t newsize;
if (b->buffsize >= MAX_SIZET/2)
luaX_lexerror(ls, "lexical element too long", 0);
newsize = b->buffsize * 2;
luaZ_resizebuffer(ls->L, b, newsize);
}
b->buffer[b->n++] = cast(char, c);
}
void luaX_init (lua_State *L) {
int i;
for (i=0; i<NUM_RESERVED; i++) {
TString *ts = luaS_new(L, luaX_tokens[i]);
luaS_fix(ts); /* reserved words are never collected */
lua_assert(strlen(luaX_tokens[i])+1 <= TOKEN_LEN);
ts->tsv.reserved = cast_byte(i+1); /* reserved word */
}
}
#define MAXSRC 80
const char *luaX_token2str (LexState *ls, int token) {
if (token < FIRST_RESERVED) {
lua_assert(token == cast(unsigned char, token));
return (iscntrl(token)) ? luaO_pushfstring(ls->L, "char(%d)", token) :
luaO_pushfstring(ls->L, "%c", token);
}
else
return luaX_tokens[token-FIRST_RESERVED];
}
static const char *txtToken (LexState *ls, int token) {
switch (token) {
case TK_NAME:
case TK_STRING:
case TK_NUMBER:
save(ls, '\0');
return luaZ_buffer(ls->buff);
default:
return luaX_token2str(ls, token);
}
}
void luaX_lexerror (LexState *ls, const char *msg, int token) {
char buff[MAXSRC];
luaO_chunkid(buff, getstr(ls->source), MAXSRC);
msg = luaO_pushfstring(ls->L, "%s:%d: %s", buff, ls->linenumber, msg);
if (token)
luaO_pushfstring(ls->L, "%s near " LUA_QS, msg, txtToken(ls, token));
luaD_throw(ls->L, LUA_ERRSYNTAX);
}
void luaX_syntaxerror (LexState *ls, const char *msg) {
luaX_lexerror(ls, msg, ls->t.token);
}
TString *luaX_newstring (LexState *ls, const char *str, size_t l) {
lua_State *L = ls->L;
TString *ts = luaS_newlstr(L, str, l);
TValue *o = luaH_setstr(L, ls->fs->h, ts); /* entry for `str' */
if (ttisnil(o)) {
setbvalue(o, 1); /* make sure `str' will not be collected */
luaC_checkGC(L);
}
return ts;
}
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)
luaX_syntaxerror(ls, "chunk has too many lines");
}
void luaX_setinput (lua_State *L, LexState *ls, ZIO *z, TString *source) {
ls->decpoint = '.';
ls->L = L;
ls->lookahead.token = TK_EOS; /* no look-ahead token */
ls->z = z;
ls->fs = NULL;
ls->linenumber = 1;
ls->lastline = 1;
ls->source = source;
luaZ_resizebuffer(ls->L, ls->buff, LUA_MINBUFFER); /* initialize buffer */
next(ls); /* read first char */
}
/*
** =======================================================
** LEXICAL ANALYZER
** =======================================================
*/
static int check_next (LexState *ls, const char *set) {
if (!strchr(set, ls->current))
return 0;
save_and_next(ls);
return 1;
}
static void buffreplace (LexState *ls, char from, char to) {
size_t n = luaZ_bufflen(ls->buff);
char *p = luaZ_buffer(ls->buff);
while (n--)
if (p[n] == from) p[n] = to;
}
static void trydecpoint (LexState *ls, SemInfo *seminfo) {
/* format error: try to update decimal point separator */
struct lconv *cv = localeconv();
char old = ls->decpoint;
ls->decpoint = (cv ? cv->decimal_point[0] : '.');
buffreplace(ls, old, ls->decpoint); /* try updated decimal separator */
if (!luaO_str2d(luaZ_buffer(ls->buff), &seminfo->r)) {
/* format error with correct decimal point: no more options */
buffreplace(ls, ls->decpoint, '.'); /* undo change (for error message) */
luaX_lexerror(ls, "malformed number", TK_NUMBER);
}
}
/* LUA_NUMBER */
static void read_numeral (LexState *ls, SemInfo *seminfo) {
lua_assert(isdigit(ls->current));
do {
save_and_next(ls);
} while (isdigit(ls->current) || ls->current == '.');
if (check_next(ls, "Ee")) /* `E'? */
check_next(ls, "+-"); /* optional exponent sign */
while (isalnum(ls->current) || ls->current == '_')
save_and_next(ls);
save(ls, '\0');
buffreplace(ls, '.', ls->decpoint); /* follow locale for decimal point */
if (!luaO_str2d(luaZ_buffer(ls->buff), &seminfo->r)) /* format error? */
trydecpoint(ls, seminfo); /* try to update decimal point separator */
}
static int skip_sep (LexState *ls) {
int 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 : (-count) - 1;
}
static void read_long_string (LexState *ls, SemInfo *seminfo, int sep) {
int cont = 0;
(void)(cont); /* avoid warnings when `cont' is not used */
save_and_next(ls); /* skip 2nd `[' */
if (currIsNewline(ls)) /* string starts with a newline? */
inclinenumber(ls); /* skip it */
for (;;) {
switch (ls->current) {
case EOZ:
luaX_lexerror(ls, (seminfo) ? "unfinished long string" :
"unfinished long comment", TK_EOS);
break; /* to avoid warnings */
#if defined(LUA_COMPAT_LSTR)
case '[': {
if (skip_sep(ls) == sep) {
save_and_next(ls); /* skip 2nd `[' */
cont++;
#if LUA_COMPAT_LSTR == 1
if (sep == 0)
luaX_lexerror(ls, "nesting of [[...]] is deprecated", '[');
#endif
}
break;
}
#endif
case ']': {
if (skip_sep(ls) == sep) {
save_and_next(ls); /* skip 2nd `]' */
#if defined(LUA_COMPAT_LSTR) && LUA_COMPAT_LSTR == 2
cont--;
if (sep == 0 && cont >= 0) break;
#endif
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) + (2 + sep),
luaZ_bufflen(ls->buff) - 2*(2 + sep));
}
static void read_string (LexState *ls, int del, SemInfo *seminfo) {
save_and_next(ls);
while (ls->current != del) {
switch (ls->current) {
case EOZ:
luaX_lexerror(ls, "unfinished string", TK_EOS);
continue; /* to avoid warnings */
case '\n':
case '\r':
luaX_lexerror(ls, "unfinished string", TK_STRING);
continue; /* to avoid warnings */
case '\\': {
int c;
next(ls); /* do not save the `\' */
switch (ls->current) {
case 'a': c = '\a'; break;
case 'b': c = '\b'; break;
case 'f': c = '\f'; break;
case 'n': c = '\n'; break;
case 'r': c = '\r'; break;
case 't': c = '\t'; break;
case 'v': c = '\v'; break;
case '\n': /* go through */
case '\r': save(ls, '\n'); inclinenumber(ls); continue;
case EOZ: continue; /* will raise an error next loop */
default: {
if (!isdigit(ls->current))
save_and_next(ls); /* handles \\, \", \', and \? */
else { /* \xxx */
int i = 0;
c = 0;
do {
c = 10*c + (ls->current-'0');
next(ls);
} while (++i<3 && isdigit(ls->current));
if (c > UCHAR_MAX)
luaX_lexerror(ls, "escape sequence too large", TK_STRING);
save(ls, c);
}
continue;
}
}
save(ls, c);
next(ls);
continue;
}
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': {
inclinenumber(ls);
continue;
}
case '-': {
next(ls);
if (ls->current != '-') return '-';
/* else is a comment */
next(ls);
if (ls->current == '[') {
int sep = skip_sep(ls);
luaZ_resetbuffer(ls->buff); /* `skip_sep' may dirty the buffer */
if (sep >= 0) {
read_long_string(ls, NULL, sep); /* long comment */
luaZ_resetbuffer(ls->buff);
continue;
}
}
/* else short comment */
while (!currIsNewline(ls) && ls->current != EOZ)
next(ls);
continue;
}
case '[': {
int sep = skip_sep(ls);
if (sep >= 0) {
read_long_string(ls, seminfo, sep);
return TK_STRING;
}
else if (sep == -1) return '[';
else luaX_lexerror(ls, "invalid long string delimiter", TK_STRING);
}
case '=': {
next(ls);
if (ls->current != '=') return '=';
else { next(ls); return TK_EQ; }
}
case '<': {
next(ls);
if (ls->current != '=') return '<';
else { next(ls); return TK_LE; }
}
case '>': {
next(ls);
if (ls->current != '=') return '>';
else { next(ls); return TK_GE; }
}
case '~': {
next(ls);
if (ls->current != '=') return '~';
else { next(ls); return TK_NE; }
}
case '"':
case '\'': {
read_string(ls, ls->current, seminfo);
return TK_STRING;
}
case '.': {
save_and_next(ls);
if (check_next(ls, ".")) {
if (check_next(ls, "."))
return TK_DOTS; /* ... */
else return TK_CONCAT; /* .. */
}
else if (!isdigit(ls->current)) return '.';
else {
read_numeral(ls, seminfo);
return TK_NUMBER;
}
}
case EOZ: {
return TK_EOS;
}
default: {
if (isspace(ls->current)) {
lua_assert(!currIsNewline(ls));
next(ls);
continue;
}
else if (isdigit(ls->current)) {
read_numeral(ls, seminfo);
return TK_NUMBER;
}
else if (isalpha(ls->current) || ls->current == '_') {
/* identifier or reserved word */
TString *ts;
do {
save_and_next(ls);
} while (isalnum(ls->current) || ls->current == '_');
ts = luaX_newstring(ls, luaZ_buffer(ls->buff),
luaZ_bufflen(ls->buff));
if (ts->tsv.reserved > 0) /* reserved word? */
return ts->tsv.reserved - 1 + FIRST_RESERVED;
else {
seminfo->ts = ts;
return TK_NAME;
}
}
else {
int c = ls->current;
next(ls);
return c; /* single-char tokens (+ - / ...) */
}
}
}
}
}
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 */
}
void luaX_lookahead (LexState *ls) {
lua_assert(ls->lookahead.token == TK_EOS);
ls->lookahead.token = llex(ls, &ls->lookahead.seminfo);
}

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/*
** $Id: llex.h,v 1.58.1.1 2007/12/27 13:02:25 roberto Exp $
** Lexical Analyzer
** See Copyright Notice in lua.h
*/
#ifndef llex_h
#define llex_h
#include "lobject.h"
#include "lzio.h"
#define FIRST_RESERVED 257
/* maximum length of a reserved word */
#define TOKEN_LEN (sizeof("function")/sizeof(char))
/*
* 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_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_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE, TK_NUMBER,
TK_NAME, TK_STRING, TK_EOS
};
/* number of reserved words */
#define NUM_RESERVED (cast(int, TK_WHILE-FIRST_RESERVED+1))
/* array with token `names' */
LUAI_DATA const char *const luaX_tokens [];
typedef union {
lua_Number r;
TString *ts;
} SemInfo; /* semantics information */
typedef struct Token {
int token;
SemInfo seminfo;
} Token;
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; /* `FuncState' is private to the parser */
struct lua_State *L;
ZIO *z; /* input stream */
Mbuffer *buff; /* buffer for tokens */
TString *source; /* current source name */
char decpoint; /* locale decimal point */
} LexState;
LUAI_FUNC void luaX_init (lua_State *L);
LUAI_FUNC void luaX_setinput (lua_State *L, LexState *ls, ZIO *z,
TString *source);
LUAI_FUNC TString *luaX_newstring (LexState *ls, const char *str, size_t l);
LUAI_FUNC void luaX_next (LexState *ls);
LUAI_FUNC void luaX_lookahead (LexState *ls);
LUAI_FUNC void luaX_lexerror (LexState *ls, const char *msg, int token);
LUAI_FUNC void luaX_syntaxerror (LexState *ls, const char *s);
LUAI_FUNC const char *luaX_token2str (LexState *ls, int token);
#endif

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/*
** $Id: llimits.h,v 1.69.1.1 2007/12/27 13:02:25 roberto Exp $
** 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"
typedef LUAI_UINT32 lu_int32;
typedef LUAI_UMEM lu_mem;
typedef LUAI_MEM l_mem;
/* chars used as small naturals (so that `char' is reserved for characters) */
typedef unsigned char lu_byte;
#define MAX_SIZET ((size_t)(~(size_t)0)-2)
#define MAX_LUMEM ((lu_mem)(~(lu_mem)0)-2)
#define MAX_INT (INT_MAX-2) /* maximum value of an int (-2 for safety) */
/*
** conversion of pointer to integer
** this is for hashing only; there is no problem if the integer
** cannot hold the whole pointer value
*/
#define IntPoint(p) ((unsigned int)(lu_mem)(p))
/* type to ensure maximum alignment */
typedef LUAI_USER_ALIGNMENT_T L_Umaxalign;
/* result of a `usual argument conversion' over lua_Number */
typedef LUAI_UACNUMBER l_uacNumber;
/* internal assertions for in-house debugging */
#ifdef lua_assert
#define check_exp(c,e) (lua_assert(c), (e))
#define api_check(l,e) lua_assert(e)
#else
#define lua_assert(c) ((void)0)
#define check_exp(c,e) (e)
#define api_check luai_apicheck
#endif
#ifndef UNUSED
#define UNUSED(x) ((void)(x)) /* to avoid warnings */
#endif
#ifndef cast
#define cast(t, exp) ((t)(exp))
#endif
#define cast_byte(i) cast(lu_byte, (i))
#define cast_num(i) cast(lua_Number, (i))
#define cast_int(i) cast(int, (i))
/*
** type for virtual-machine instructions
** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)
*/
typedef lu_int32 Instruction;
/* maximum stack for a Lua function */
#define MAXSTACK 250
/* minimum size for the string table (must be power of 2) */
#ifndef MINSTRTABSIZE
#define MINSTRTABSIZE 32
#endif
/* minimum size for string buffer */
#ifndef LUA_MINBUFFER
#define LUA_MINBUFFER 32
#endif
#ifndef lua_lock
#define lua_lock(L) ((void) 0)
#define lua_unlock(L) ((void) 0)
#endif
#ifndef luai_threadyield
#define luai_threadyield(L) {lua_unlock(L); lua_lock(L);}
#endif
/*
** macro to control inclusion of some hard tests on stack reallocation
*/
#ifndef HARDSTACKTESTS
#define condhardstacktests(x) ((void)0)
#else
#define condhardstacktests(x) x
#endif
#endif

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/*
** $Id: lmathlib.c,v 1.67.1.1 2007/12/27 13:02:25 roberto Exp $
** Standard mathematical library
** See Copyright Notice in lua.h
*/
#include <stdlib.h>
#include <math.h>
#define lmathlib_c
#define LUA_LIB
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#undef PI
#define PI (3.14159265358979323846)
#define RADIANS_PER_DEGREE (PI/180.0)
static int math_abs (lua_State *L) {
lua_pushnumber(L, fabs(luaL_checknumber(L, 1)));
return 1;
}
static int math_sin (lua_State *L) {
lua_pushnumber(L, sin(luaL_checknumber(L, 1)));
return 1;
}
static int math_sinh (lua_State *L) {
lua_pushnumber(L, sinh(luaL_checknumber(L, 1)));
return 1;
}
static int math_cos (lua_State *L) {
lua_pushnumber(L, cos(luaL_checknumber(L, 1)));
return 1;
}
static int math_cosh (lua_State *L) {
lua_pushnumber(L, cosh(luaL_checknumber(L, 1)));
return 1;
}
static int math_tan (lua_State *L) {
lua_pushnumber(L, tan(luaL_checknumber(L, 1)));
return 1;
}
static int math_tanh (lua_State *L) {
lua_pushnumber(L, tanh(luaL_checknumber(L, 1)));
return 1;
}
static int math_asin (lua_State *L) {
lua_pushnumber(L, asin(luaL_checknumber(L, 1)));
return 1;
}
static int math_acos (lua_State *L) {
lua_pushnumber(L, acos(luaL_checknumber(L, 1)));
return 1;
}
static int math_atan (lua_State *L) {
lua_pushnumber(L, atan(luaL_checknumber(L, 1)));
return 1;
}
static int math_atan2 (lua_State *L) {
lua_pushnumber(L, atan2(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
return 1;
}
static int math_ceil (lua_State *L) {
lua_pushnumber(L, ceil(luaL_checknumber(L, 1)));
return 1;
}
static int math_floor (lua_State *L) {
lua_pushnumber(L, floor(luaL_checknumber(L, 1)));
return 1;
}
static int math_fmod (lua_State *L) {
lua_pushnumber(L, fmod(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
return 1;
}
static int math_modf (lua_State *L) {
double ip;
double fp = modf(luaL_checknumber(L, 1), &ip);
lua_pushnumber(L, ip);
lua_pushnumber(L, fp);
return 2;
}
static int math_sqrt (lua_State *L) {
lua_pushnumber(L, sqrt(luaL_checknumber(L, 1)));
return 1;
}
static int math_pow (lua_State *L) {
lua_pushnumber(L, pow(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
return 1;
}
static int math_log (lua_State *L) {
lua_pushnumber(L, log(luaL_checknumber(L, 1)));
return 1;
}
static int math_log10 (lua_State *L) {
lua_pushnumber(L, log10(luaL_checknumber(L, 1)));
return 1;
}
static int math_exp (lua_State *L) {
lua_pushnumber(L, exp(luaL_checknumber(L, 1)));
return 1;
}
static int math_deg (lua_State *L) {
lua_pushnumber(L, luaL_checknumber(L, 1)/RADIANS_PER_DEGREE);
return 1;
}
static int math_rad (lua_State *L) {
lua_pushnumber(L, luaL_checknumber(L, 1)*RADIANS_PER_DEGREE);
return 1;
}
static int math_frexp (lua_State *L) {
int e;
lua_pushnumber(L, frexp(luaL_checknumber(L, 1), &e));
lua_pushinteger(L, e);
return 2;
}
static int math_ldexp (lua_State *L) {
lua_pushnumber(L, ldexp(luaL_checknumber(L, 1), luaL_checkint(L, 2)));
return 1;
}
static int math_min (lua_State *L) {
int n = lua_gettop(L); /* number of arguments */
lua_Number dmin = luaL_checknumber(L, 1);
int i;
for (i=2; i<=n; i++) {
lua_Number d = luaL_checknumber(L, i);
if (d < dmin)
dmin = d;
}
lua_pushnumber(L, dmin);
return 1;
}
static int math_max (lua_State *L) {
int n = lua_gettop(L); /* number of arguments */
lua_Number dmax = luaL_checknumber(L, 1);
int i;
for (i=2; i<=n; i++) {
lua_Number d = luaL_checknumber(L, i);
if (d > dmax)
dmax = d;
}
lua_pushnumber(L, dmax);
return 1;
}
static int math_random (lua_State *L) {
/* the `%' avoids the (rare) case of r==1, and is needed also because on
some systems (SunOS!) `rand()' may return a value larger than RAND_MAX */
lua_Number r = (lua_Number)(rand()%RAND_MAX) / (lua_Number)RAND_MAX;
switch (lua_gettop(L)) { /* check number of arguments */
case 0: { /* no arguments */
lua_pushnumber(L, r); /* Number between 0 and 1 */
break;
}
case 1: { /* only upper limit */
int u = luaL_checkint(L, 1);
luaL_argcheck(L, 1<=u, 1, "interval is empty");
lua_pushnumber(L, floor(r*u)+1); /* int between 1 and `u' */
break;
}
case 2: { /* lower and upper limits */
int l = luaL_checkint(L, 1);
int u = luaL_checkint(L, 2);
luaL_argcheck(L, l<=u, 2, "interval is empty");
lua_pushnumber(L, floor(r*(u-l+1))+l); /* int between `l' and `u' */
break;
}
default: return luaL_error(L, "wrong number of arguments");
}
return 1;
}
static int math_randomseed (lua_State *L) {
srand(luaL_checkint(L, 1));
return 0;
}
static const luaL_Reg mathlib[] = {
{"abs", math_abs},
{"acos", math_acos},
{"asin", math_asin},
{"atan2", math_atan2},
{"atan", math_atan},
{"ceil", math_ceil},
{"cosh", math_cosh},
{"cos", math_cos},
{"deg", math_deg},
{"exp", math_exp},
{"floor", math_floor},
{"fmod", math_fmod},
{"frexp", math_frexp},
{"ldexp", math_ldexp},
{"log10", math_log10},
{"log", math_log},
{"max", math_max},
{"min", math_min},
{"modf", math_modf},
{"pow", math_pow},
{"rad", math_rad},
{"random", math_random},
{"randomseed", math_randomseed},
{"sinh", math_sinh},
{"sin", math_sin},
{"sqrt", math_sqrt},
{"tanh", math_tanh},
{"tan", math_tan},
{NULL, NULL}
};
/*
** Open math library
*/
LUALIB_API int luaopen_math (lua_State *L) {
luaL_register(L, LUA_MATHLIBNAME, mathlib);
lua_pushnumber(L, PI);
lua_setfield(L, -2, "pi");
lua_pushnumber(L, HUGE_VAL);
lua_setfield(L, -2, "huge");
#if defined(LUA_COMPAT_MOD)
lua_getfield(L, -1, "fmod");
lua_setfield(L, -2, "mod");
#endif
return 1;
}

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/*
** $Id: lmem.c,v 1.70.1.1 2007/12/27 13:02:25 roberto Exp $
** Interface to Memory Manager
** See Copyright Notice in lua.h
*/
#include <stddef.h>
#define lmem_c
#define LUA_CORE
#include "lua.h"
#include "ldebug.h"
#include "ldo.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
/*
** 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)
**
** Lua ensures that (ptr == NULL) iff (osize == 0).
**
** * frealloc(ud, NULL, 0, x) creates a new block of size `x'
**
** * frealloc(ud, p, x, 0) frees the block `p'
** (in this specific case, frealloc must return NULL).
** particularly, frealloc(ud, NULL, 0, 0) does nothing
** (which is equivalent to free(NULL) in ANSI C)
**
** frealloc returns NULL if it cannot create or reallocate the area
** (any reallocation to an equal or smaller size cannot fail!)
*/
#define MINSIZEARRAY 4
void *luaM_growaux_ (lua_State *L, void *block, int *size, size_t size_elems,
int limit, const char *errormsg) {
void *newblock;
int newsize;
if (*size >= limit/2) { /* cannot double it? */
if (*size >= limit) /* cannot grow even a little? */
luaG_runerror(L, errormsg);
newsize = limit; /* still have at least one free place */
}
else {
newsize = (*size)*2;
if (newsize < MINSIZEARRAY)
newsize = MINSIZEARRAY; /* minimum size */
}
newblock = luaM_reallocv(L, block, *size, newsize, size_elems);
*size = newsize; /* update only when everything else is OK */
return newblock;
}
void *luaM_toobig (lua_State *L) {
luaG_runerror(L, "memory allocation error: block too big");
return NULL; /* to avoid warnings */
}
/*
** generic allocation routine.
*/
void *luaM_realloc_ (lua_State *L, void *block, size_t osize, size_t nsize) {
global_State *g = G(L);
lua_assert((osize == 0) == (block == NULL));
block = (*g->frealloc)(g->ud, block, osize, nsize);
if (block == NULL && nsize > 0)
luaD_throw(L, LUA_ERRMEM);
lua_assert((nsize == 0) == (block == NULL));
g->totalbytes = (g->totalbytes - osize) + nsize;
return block;
}

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/*
** $Id: lmem.h,v 1.31.1.1 2007/12/27 13:02:25 roberto Exp $
** 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"
#define MEMERRMSG "not enough memory"
#define luaM_reallocv(L,b,on,n,e) \
((cast(size_t, (n)+1) <= MAX_SIZET/(e)) ? /* +1 to avoid warnings */ \
luaM_realloc_(L, (b), (on)*(e), (n)*(e)) : \
luaM_toobig(L))
#define luaM_freemem(L, b, s) luaM_realloc_(L, (b), (s), 0)
#define luaM_free(L, b) luaM_realloc_(L, (b), sizeof(*(b)), 0)
#define luaM_freearray(L, b, n, t) luaM_reallocv(L, (b), n, 0, sizeof(t))
#define luaM_malloc(L,t) luaM_realloc_(L, NULL, 0, (t))
#define luaM_new(L,t) cast(t *, luaM_malloc(L, sizeof(t)))
#define luaM_newvector(L,n,t) \
cast(t *, luaM_reallocv(L, NULL, 0, n, sizeof(t)))
#define luaM_growvector(L,v,nelems,size,t,limit,e) \
if ((nelems)+1 > (size)) \
((v)=cast(t *, luaM_growaux_(L,v,&(size),sizeof(t),limit,e)))
#define luaM_reallocvector(L, v,oldn,n,t) \
((v)=cast(t *, luaM_reallocv(L, v, oldn, n, sizeof(t))))
LUAI_FUNC void *luaM_realloc_ (lua_State *L, void *block, size_t oldsize,
size_t size);
LUAI_FUNC void *luaM_toobig (lua_State *L);
LUAI_FUNC void *luaM_growaux_ (lua_State *L, void *block, int *size,
size_t size_elem, int limit,
const char *errormsg);
#endif

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/*
** $Id: loadlib.c,v 1.52.1.4 2009/09/09 13:17:16 roberto Exp $
** 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 Darwin (Mac OS X), an
** implementation for Windows, and a stub for other systems.
*/
#include <stdlib.h>
#include <string.h>
#define loadlib_c
#define LUA_LIB
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
/* prefix for open functions in C libraries */
#define LUA_POF "luaopen_"
/* separator for open functions in C libraries */
#define LUA_OFSEP "_"
#define LIBPREFIX "LOADLIB: "
#define POF LUA_POF
#define LIB_FAIL "open"
/* error codes for ll_loadfunc */
#define ERRLIB 1
#define ERRFUNC 2
#define setprogdir(L) ((void)0)
static void ll_unloadlib (void *lib);
static void *ll_load (lua_State *L, const char *path);
static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym);
#if defined(LUA_DL_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>
static void ll_unloadlib (void *lib) {
dlclose(lib);
}
static void *ll_load (lua_State *L, const char *path) {
void *lib = dlopen(path, RTLD_NOW);
if (lib == NULL) lua_pushstring(L, dlerror());
return lib;
}
static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
lua_CFunction f = (lua_CFunction)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>
#undef setprogdir
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);
if (n == 0 || n == nsize || (lb = strrchr(buff, '\\')) == NULL)
luaL_error(L, "unable to get ModuleFileName");
else {
*lb = '\0';
luaL_gsub(L, lua_tostring(L, -1), LUA_EXECDIR, 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), NULL))
lua_pushstring(L, buffer);
else
lua_pushfstring(L, "system error %d\n", error);
}
static void ll_unloadlib (void *lib) {
FreeLibrary((HINSTANCE)lib);
}
static void *ll_load (lua_State *L, const char *path) {
HINSTANCE lib = LoadLibraryA(path);
if (lib == NULL) pusherror(L);
return lib;
}
static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
lua_CFunction f = (lua_CFunction)GetProcAddress((HINSTANCE)lib, sym);
if (f == NULL) pusherror(L);
return f;
}
/* }====================================================== */
#elif defined(LUA_DL_DYLD)
/*
** {======================================================================
** Native Mac OS X / Darwin Implementation
** =======================================================================
*/
#include <mach-o/dyld.h>
/* Mac appends a `_' before C function names */
#undef POF
#define POF "_" LUA_POF
static void pusherror (lua_State *L) {
const char *err_str;
const char *err_file;
NSLinkEditErrors err;
int err_num;
NSLinkEditError(&err, &err_num, &err_file, &err_str);
lua_pushstring(L, err_str);
}
static const char *errorfromcode (NSObjectFileImageReturnCode ret) {
switch (ret) {
case NSObjectFileImageInappropriateFile:
return "file is not a bundle";
case NSObjectFileImageArch:
return "library is for wrong CPU type";
case NSObjectFileImageFormat:
return "bad format";
case NSObjectFileImageAccess:
return "cannot access file";
case NSObjectFileImageFailure:
default:
return "unable to load library";
}
}
static void ll_unloadlib (void *lib) {
NSUnLinkModule((NSModule)lib, NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES);
}
static void *ll_load (lua_State *L, const char *path) {
NSObjectFileImage img;
NSObjectFileImageReturnCode ret;
/* this would be a rare case, but prevents crashing if it happens */
if(!_dyld_present()) {
lua_pushliteral(L, "dyld not present");
return NULL;
}
ret = NSCreateObjectFileImageFromFile(path, &img);
if (ret == NSObjectFileImageSuccess) {
NSModule mod = NSLinkModule(img, path, NSLINKMODULE_OPTION_PRIVATE |
NSLINKMODULE_OPTION_RETURN_ON_ERROR);
NSDestroyObjectFileImage(img);
if (mod == NULL) pusherror(L);
return mod;
}
lua_pushstring(L, errorfromcode(ret));
return NULL;
}
static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
NSSymbol nss = NSLookupSymbolInModule((NSModule)lib, sym);
if (nss == NULL) {
lua_pushfstring(L, "symbol " LUA_QS " not found", sym);
return NULL;
}
return (lua_CFunction)NSAddressOfSymbol(nss);
}
/* }====================================================== */
#else
/*
** {======================================================
** Fallback for other systems
** =======================================================
*/
#undef LIB_FAIL
#define LIB_FAIL "absent"
#define DLMSG "dynamic libraries not enabled; check your Lua installation"
static void ll_unloadlib (void *lib) {
(void)lib; /* to avoid warnings */
}
static void *ll_load (lua_State *L, const char *path) {
(void)path; /* to avoid warnings */
lua_pushliteral(L, DLMSG);
return NULL;
}
static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
(void)lib; (void)sym; /* to avoid warnings */
lua_pushliteral(L, DLMSG);
return NULL;
}
/* }====================================================== */
#endif
static void **ll_register (lua_State *L, const char *path) {
void **plib;
lua_pushfstring(L, "%s%s", LIBPREFIX, path);
lua_gettable(L, LUA_REGISTRYINDEX); /* check library in registry? */
if (!lua_isnil(L, -1)) /* is there an entry? */
plib = (void **)lua_touserdata(L, -1);
else { /* no entry yet; create one */
lua_pop(L, 1);
plib = (void **)lua_newuserdata(L, sizeof(const void *));
*plib = NULL;
luaL_getmetatable(L, "_LOADLIB");
lua_setmetatable(L, -2);
lua_pushfstring(L, "%s%s", LIBPREFIX, path);
lua_pushvalue(L, -2);
lua_settable(L, LUA_REGISTRYINDEX);
}
return plib;
}
/*
** __gc tag method: calls library's `ll_unloadlib' function with the lib
** handle
*/
static int gctm (lua_State *L) {
void **lib = (void **)luaL_checkudata(L, 1, "_LOADLIB");
if (*lib) ll_unloadlib(*lib);
*lib = NULL; /* mark library as closed */
return 0;
}
static int ll_loadfunc (lua_State *L, const char *path, const char *sym) {
void **reg = ll_register(L, path);
if (*reg == NULL) *reg = ll_load(L, path);
if (*reg == NULL)
return ERRLIB; /* unable to load library */
else {
lua_CFunction f = ll_sym(L, *reg, sym);
if (f == NULL)
return ERRFUNC; /* unable to find function */
lua_pushcfunction(L, f);
return 0; /* return function */
}
}
static int ll_loadlib (lua_State *L) {
const char *path = luaL_checkstring(L, 1);
const char *init = luaL_checkstring(L, 2);
int stat = ll_loadfunc(L, path, init);
if (stat == 0) /* no errors? */
return 1; /* return the loaded function */
else { /* error; error message is on stack top */
lua_pushnil(L);
lua_insert(L, -2);
lua_pushstring(L, (stat == ERRLIB) ? LIB_FAIL : "init");
return 3; /* return nil, 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;
}
static const char *pushnexttemplate (lua_State *L, const char *path) {
const char *l;
while (*path == *LUA_PATHSEP) path++; /* skip separators */
if (*path == '\0') return NULL; /* no more templates */
l = strchr(path, *LUA_PATHSEP); /* find next separator */
if (l == NULL) l = path + strlen(path);
lua_pushlstring(L, path, l - path); /* template */
return l;
}
static const char *findfile (lua_State *L, const char *name,
const char *pname) {
const char *path;
name = luaL_gsub(L, name, ".", LUA_DIRSEP);
lua_getfield(L, LUA_ENVIRONINDEX, pname);
path = lua_tostring(L, -1);
if (path == NULL)
luaL_error(L, LUA_QL("package.%s") " must be a string", pname);
lua_pushliteral(L, ""); /* error accumulator */
while ((path = pushnexttemplate(L, path)) != NULL) {
const char *filename;
filename = luaL_gsub(L, lua_tostring(L, -1), LUA_PATH_MARK, name);
lua_remove(L, -2); /* remove path template */
if (readable(filename)) /* does file exist and is readable? */
return filename; /* return that file name */
lua_pushfstring(L, "\n\tno file " LUA_QS, filename);
lua_remove(L, -2); /* remove file name */
lua_concat(L, 2); /* add entry to possible error message */
}
return NULL; /* not found */
}
static void loaderror (lua_State *L, const char *filename) {
luaL_error(L, "error loading module " LUA_QS " from file " LUA_QS ":\n\t%s",
lua_tostring(L, 1), filename, lua_tostring(L, -1));
}
static int loader_Lua (lua_State *L) {
const char *filename;
const char *name = luaL_checkstring(L, 1);
filename = findfile(L, name, "path");
if (filename == NULL) return 1; /* library not found in this path */
if (luaL_loadfile(L, filename) != 0)
loaderror(L, filename);
return 1; /* library loaded successfully */
}
static const char *mkfuncname (lua_State *L, const char *modname) {
const char *funcname;
const char *mark = strchr(modname, *LUA_IGMARK);
if (mark) modname = mark + 1;
funcname = luaL_gsub(L, modname, ".", LUA_OFSEP);
funcname = lua_pushfstring(L, POF"%s", funcname);
lua_remove(L, -2); /* remove 'gsub' result */
return funcname;
}
static int loader_C (lua_State *L) {
const char *funcname;
const char *name = luaL_checkstring(L, 1);
const char *filename = findfile(L, name, "cpath");
if (filename == NULL) return 1; /* library not found in this path */
funcname = mkfuncname(L, name);
if (ll_loadfunc(L, filename, funcname) != 0)
loaderror(L, filename);
return 1; /* library loaded successfully */
}
static int loader_Croot (lua_State *L) {
const char *funcname;
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");
if (filename == NULL) return 1; /* root not found */
funcname = mkfuncname(L, name);
if ((stat = ll_loadfunc(L, filename, funcname)) != 0) {
if (stat != ERRFUNC) loaderror(L, filename); /* real error */
lua_pushfstring(L, "\n\tno module " LUA_QS " in file " LUA_QS,
name, filename);
return 1; /* function not found */
}
return 1;
}
static int loader_preload (lua_State *L) {
const char *name = luaL_checkstring(L, 1);
lua_getfield(L, LUA_ENVIRONINDEX, "preload");
if (!lua_istable(L, -1))
luaL_error(L, LUA_QL("package.preload") " must be a table");
lua_getfield(L, -1, name);
if (lua_isnil(L, -1)) /* not found? */
lua_pushfstring(L, "\n\tno field package.preload['%s']", name);
return 1;
}
static const int sentinel_ = 0;
#define sentinel ((void *)&sentinel_)
static int ll_require (lua_State *L) {
const char *name = luaL_checkstring(L, 1);
int i;
lua_settop(L, 1); /* _LOADED table will be at index 2 */
lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
lua_getfield(L, 2, name);
if (lua_toboolean(L, -1)) { /* is it there? */
if (lua_touserdata(L, -1) == sentinel) /* check loops */
luaL_error(L, "loop or previous error loading module " LUA_QS, name);
return 1; /* package is already loaded */
}
/* else must load it; iterate over available loaders */
lua_getfield(L, LUA_ENVIRONINDEX, "loaders");
if (!lua_istable(L, -1))
luaL_error(L, LUA_QL("package.loaders") " must be a table");
lua_pushliteral(L, ""); /* error message accumulator */
for (i=1; ; i++) {
lua_rawgeti(L, -2, i); /* get a loader */
if (lua_isnil(L, -1))
luaL_error(L, "module " LUA_QS " not found:%s",
name, lua_tostring(L, -2));
lua_pushstring(L, name);
lua_call(L, 1, 1); /* call it */
if (lua_isfunction(L, -1)) /* did it find module? */
break; /* module loaded successfully */
else if (lua_isstring(L, -1)) /* loader returned error message? */
lua_concat(L, 2); /* accumulate it */
else
lua_pop(L, 1);
}
lua_pushlightuserdata(L, sentinel);
lua_setfield(L, 2, name); /* _LOADED[name] = sentinel */
lua_pushstring(L, name); /* pass name as argument to module */
lua_call(L, 1, 1); /* run loaded module */
if (!lua_isnil(L, -1)) /* non-nil return? */
lua_setfield(L, 2, name); /* _LOADED[name] = returned value */
lua_getfield(L, 2, name);
if (lua_touserdata(L, -1) == sentinel) { /* module did not set a value? */
lua_pushboolean(L, 1); /* use true as result */
lua_pushvalue(L, -1); /* extra copy to be returned */
lua_setfield(L, 2, name); /* _LOADED[name] = true */
}
return 1;
}
/* }====================================================== */
/*
** {======================================================
** 'module' function
** =======================================================
*/
static void setfenv (lua_State *L) {
lua_Debug ar;
if (lua_getstack(L, 1, &ar) == 0 ||
lua_getinfo(L, "f", &ar) == 0 || /* get calling function */
lua_iscfunction(L, -1))
luaL_error(L, LUA_QL("module") " not called from a Lua function");
lua_pushvalue(L, -2);
lua_setfenv(L, -2);
lua_pop(L, 1);
}
static void dooptions (lua_State *L, int n) {
int i;
for (i = 2; i <= n; i++) {
lua_pushvalue(L, i); /* get option (a function) */
lua_pushvalue(L, -2); /* module */
lua_call(L, 1, 0);
}
}
static void modinit (lua_State *L, const char *modname) {
const char *dot;
lua_pushvalue(L, -1);
lua_setfield(L, -2, "_M"); /* module._M = module */
lua_pushstring(L, modname);
lua_setfield(L, -2, "_NAME");
dot = strrchr(modname, '.'); /* look for last dot in module name */
if (dot == NULL) dot = modname;
else dot++;
/* set _PACKAGE as package name (full module name minus last part) */
lua_pushlstring(L, modname, dot - modname);
lua_setfield(L, -2, "_PACKAGE");
}
static int ll_module (lua_State *L) {
const char *modname = luaL_checkstring(L, 1);
int loaded = lua_gettop(L) + 1; /* index of _LOADED table */
lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
lua_getfield(L, loaded, modname); /* get _LOADED[modname] */
if (!lua_istable(L, -1)) { /* not found? */
lua_pop(L, 1); /* remove previous result */
/* try global variable (and create one if it does not exist) */
if (luaL_findtable(L, LUA_GLOBALSINDEX, modname, 1) != NULL)
return luaL_error(L, "name conflict for module " LUA_QS, modname);
lua_pushvalue(L, -1);
lua_setfield(L, loaded, modname); /* _LOADED[modname] = new table */
}
/* check whether table already has a _NAME field */
lua_getfield(L, -1, "_NAME");
if (!lua_isnil(L, -1)) /* is table an initialized module? */
lua_pop(L, 1);
else { /* no; initialize it */
lua_pop(L, 1);
modinit(L, modname);
}
lua_pushvalue(L, -1);
setfenv(L);
dooptions(L, loaded - 1);
return 0;
}
static int ll_seeall (lua_State *L) {
luaL_checktype(L, 1, LUA_TTABLE);
if (!lua_getmetatable(L, 1)) {
lua_createtable(L, 0, 1); /* create new metatable */
lua_pushvalue(L, -1);
lua_setmetatable(L, 1);
}
lua_pushvalue(L, LUA_GLOBALSINDEX);
lua_setfield(L, -2, "__index"); /* mt.__index = _G */
return 0;
}
/* }====================================================== */
/* auxiliary mark (for internal use) */
#define AUXMARK "\1"
static void setpath (lua_State *L, const char *fieldname, const char *envname,
const char *def) {
const char *path = getenv(envname);
if (path == NULL) /* no environment variable? */
lua_pushstring(L, def); /* use default */
else {
/* replace ";;" by ";AUXMARK;" and then AUXMARK by default path */
path = luaL_gsub(L, path, LUA_PATHSEP LUA_PATHSEP,
LUA_PATHSEP AUXMARK LUA_PATHSEP);
luaL_gsub(L, path, AUXMARK, def);
lua_remove(L, -2);
}
setprogdir(L);
lua_setfield(L, -2, fieldname);
}
static const luaL_Reg pk_funcs[] = {
{"loadlib", ll_loadlib},
{"seeall", ll_seeall},
{NULL, NULL}
};
static const luaL_Reg ll_funcs[] = {
{"module", ll_module},
{"require", ll_require},
{NULL, NULL}
};
static const lua_CFunction loaders[] =
{loader_preload, loader_Lua, loader_C, loader_Croot, NULL};
LUALIB_API int luaopen_package (lua_State *L) {
int i;
/* create new type _LOADLIB */
luaL_newmetatable(L, "_LOADLIB");
lua_pushcfunction(L, gctm);
lua_setfield(L, -2, "__gc");
/* create `package' table */
luaL_register(L, LUA_LOADLIBNAME, pk_funcs);
#if defined(LUA_COMPAT_LOADLIB)
lua_getfield(L, -1, "loadlib");
lua_setfield(L, LUA_GLOBALSINDEX, "loadlib");
#endif
lua_pushvalue(L, -1);
lua_replace(L, LUA_ENVIRONINDEX);
/* create `loaders' table */
lua_createtable(L, sizeof(loaders)/sizeof(loaders[0]) - 1, 0);
/* fill it with pre-defined loaders */
for (i=0; loaders[i] != NULL; i++) {
lua_pushcfunction(L, loaders[i]);
lua_rawseti(L, -2, i+1);
}
lua_setfield(L, -2, "loaders"); /* put it in field `loaders' */
setpath(L, "path", LUA_PATH, LUA_PATH_DEFAULT); /* set field `path' */
setpath(L, "cpath", LUA_CPATH, LUA_CPATH_DEFAULT); /* set field `cpath' */
/* store config information */
lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATHSEP "\n" LUA_PATH_MARK "\n"
LUA_EXECDIR "\n" LUA_IGMARK);
lua_setfield(L, -2, "config");
/* set field `loaded' */
luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 2);
lua_setfield(L, -2, "loaded");
/* set field `preload' */
lua_newtable(L);
lua_setfield(L, -2, "preload");
lua_pushvalue(L, LUA_GLOBALSINDEX);
luaL_register(L, NULL, ll_funcs); /* open lib into global table */
lua_pop(L, 1);
return 1; /* return 'package' table */
}

214
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@ -0,0 +1,214 @@
/*
** $Id: lobject.c,v 2.22.1.1 2007/12/27 13:02:25 roberto Exp $
** Some generic functions over Lua objects
** See Copyright Notice in lua.h
*/
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define lobject_c
#define LUA_CORE
#include "lua.h"
#include "ldo.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
#include "lstring.h"
#include "lvm.h"
const TValue luaO_nilobject_ = {{NULL}, LUA_TNIL};
/*
** converts an integer to a "floating point byte", represented as
** (eeeeexxx), where the real value is (1xxx) * 2^(eeeee - 1) if
** eeeee != 0 and (xxx) otherwise.
*/
int luaO_int2fb (unsigned int x) {
int e = 0; /* expoent */
while (x >= 16) {
x = (x+1) >> 1;
e++;
}
if (x < 8) return x;
else return ((e+1) << 3) | (cast_int(x) - 8);
}
/* converts back */
int luaO_fb2int (int x) {
int e = (x >> 3) & 31;
if (e == 0) return x;
else return ((x & 7)+8) << (e - 1);
}
int luaO_log2 (unsigned int x) {
static const lu_byte log_2[256] = {
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 = -1;
while (x >= 256) { l += 8; x >>= 8; }
return l + log_2[x];
}
int luaO_rawequalObj (const TValue *t1, const TValue *t2) {
if (ttype(t1) != ttype(t2)) return 0;
else switch (ttype(t1)) {
case LUA_TNIL:
return 1;
case LUA_TNUMBER:
return luai_numeq(nvalue(t1), nvalue(t2));
case LUA_TBOOLEAN:
return bvalue(t1) == bvalue(t2); /* boolean true must be 1 !! */
case LUA_TLIGHTUSERDATA:
return pvalue(t1) == pvalue(t2);
default:
lua_assert(iscollectable(t1));
return gcvalue(t1) == gcvalue(t2);
}
}
int luaO_str2d (const char *s, lua_Number *result) {
char *endptr;
*result = lua_str2number(s, &endptr);
if (endptr == s) return 0; /* conversion failed */
if (*endptr == 'x' || *endptr == 'X') /* maybe an hexadecimal constant? */
*result = cast_num(strtoul(s, &endptr, 16));
if (*endptr == '\0') return 1; /* most common case */
while (isspace(cast(unsigned char, *endptr))) endptr++;
if (*endptr != '\0') return 0; /* invalid trailing characters? */
return 1;
}
static void pushstr (lua_State *L, const char *str) {
setsvalue2s(L, L->top, luaS_new(L, str));
incr_top(L);
}
/* this function handles only `%d', `%c', %f, %p, and `%s' formats */
const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) {
int n = 1;
pushstr(L, "");
for (;;) {
const char *e = strchr(fmt, '%');
if (e == NULL) break;
setsvalue2s(L, L->top, luaS_newlstr(L, fmt, e-fmt));
incr_top(L);
switch (*(e+1)) {
case 's': {
const char *s = va_arg(argp, char *);
if (s == NULL) s = "(null)";
pushstr(L, s);
break;
}
case 'c': {
char buff[2];
buff[0] = cast(char, va_arg(argp, int));
buff[1] = '\0';
pushstr(L, buff);
break;
}
case 'd': {
setnvalue(L->top, cast_num(va_arg(argp, int)));
incr_top(L);
break;
}
case 'f': {
setnvalue(L->top, cast_num(va_arg(argp, l_uacNumber)));
incr_top(L);
break;
}
case 'p': {
char buff[4*sizeof(void *) + 8]; /* should be enough space for a `%p' */
sprintf(buff, "%p", va_arg(argp, void *));
pushstr(L, buff);
break;
}
case '%': {
pushstr(L, "%");
break;
}
default: {
char buff[3];
buff[0] = '%';
buff[1] = *(e+1);
buff[2] = '\0';
pushstr(L, buff);
break;
}
}
n += 2;
fmt = e+2;
}
pushstr(L, fmt);
luaV_concat(L, n+1, cast_int(L->top - L->base) - 1);
L->top -= n;
return svalue(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;
}
void luaO_chunkid (char *out, const char *source, size_t bufflen) {
if (*source == '=') {
strncpy(out, source+1, bufflen); /* remove first char */
out[bufflen-1] = '\0'; /* ensures null termination */
}
else { /* out = "source", or "...source" */
if (*source == '@') {
size_t l;
source++; /* skip the `@' */
bufflen -= sizeof(" '...' ");
l = strlen(source);
strcpy(out, "");
if (l > bufflen) {
source += (l-bufflen); /* get last part of file name */
strcat(out, "...");
}
strcat(out, source);
}
else { /* out = [string "string"] */
size_t len = strcspn(source, "\n\r"); /* stop at first newline */
bufflen -= sizeof(" [string \"...\"] ");
if (len > bufflen) len = bufflen;
strcpy(out, "[string \"");
if (source[len] != '\0') { /* must truncate? */
strncat(out, source, len);
strcat(out, "...");
}
else
strcat(out, source);
strcat(out, "\"]");
}
}
}

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/*
** $Id: lobject.h,v 2.20.1.2 2008/08/06 13:29:48 roberto Exp $
** 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"
/* tags for values visible from Lua */
#define LAST_TAG LUA_TTHREAD
#define NUM_TAGS (LAST_TAG+1)
/*
** Extra tags for non-values
*/
#define LUA_TPROTO (LAST_TAG+1)
#define LUA_TUPVAL (LAST_TAG+2)
#define LUA_TDEADKEY (LAST_TAG+3)
/*
** Union of all collectable objects
*/
typedef union GCObject GCObject;
/*
** Common Header for all collectable objects (in macro form, to be
** included in other objects)
*/
#define CommonHeader GCObject *next; lu_byte tt; lu_byte marked
/*
** Common header in struct form
*/
typedef struct GCheader {
CommonHeader;
} GCheader;
/*
** Union of all Lua values
*/
typedef union {
GCObject *gc;
void *p;
lua_Number n;
int b;
} Value;
/*
** Tagged Values
*/
#define TValuefields Value value; int tt
typedef struct lua_TValue {
TValuefields;
} TValue;
/* Macros to test type */
#define ttisnil(o) (ttype(o) == LUA_TNIL)
#define ttisnumber(o) (ttype(o) == LUA_TNUMBER)
#define ttisstring(o) (ttype(o) == LUA_TSTRING)
#define ttistable(o) (ttype(o) == LUA_TTABLE)
#define ttisfunction(o) (ttype(o) == LUA_TFUNCTION)
#define ttisboolean(o) (ttype(o) == LUA_TBOOLEAN)
#define ttisuserdata(o) (ttype(o) == LUA_TUSERDATA)
#define ttisthread(o) (ttype(o) == LUA_TTHREAD)
#define ttislightuserdata(o) (ttype(o) == LUA_TLIGHTUSERDATA)
/* Macros to access values */
#define ttype(o) ((o)->tt)
#define gcvalue(o) check_exp(iscollectable(o), (o)->value.gc)
#define pvalue(o) check_exp(ttislightuserdata(o), (o)->value.p)
#define nvalue(o) check_exp(ttisnumber(o), (o)->value.n)
#define rawtsvalue(o) check_exp(ttisstring(o), &(o)->value.gc->ts)
#define tsvalue(o) (&rawtsvalue(o)->tsv)
#define rawuvalue(o) check_exp(ttisuserdata(o), &(o)->value.gc->u)
#define uvalue(o) (&rawuvalue(o)->uv)
#define clvalue(o) check_exp(ttisfunction(o), &(o)->value.gc->cl)
#define hvalue(o) check_exp(ttistable(o), &(o)->value.gc->h)
#define bvalue(o) check_exp(ttisboolean(o), (o)->value.b)
#define thvalue(o) check_exp(ttisthread(o), &(o)->value.gc->th)
#define l_isfalse(o) (ttisnil(o) || (ttisboolean(o) && bvalue(o) == 0))
/*
** for internal debug only
*/
#define checkconsistency(obj) \
lua_assert(!iscollectable(obj) || (ttype(obj) == (obj)->value.gc->gch.tt))
#define checkliveness(g,obj) \
lua_assert(!iscollectable(obj) || \
((ttype(obj) == (obj)->value.gc->gch.tt) && !isdead(g, (obj)->value.gc)))
/* Macros to set values */
#define setnilvalue(obj) ((obj)->tt=LUA_TNIL)
#define setnvalue(obj,x) \
{ TValue *i_o=(obj); i_o->value.n=(x); i_o->tt=LUA_TNUMBER; }
#define setpvalue(obj,x) \
{ TValue *i_o=(obj); i_o->value.p=(x); i_o->tt=LUA_TLIGHTUSERDATA; }
#define setbvalue(obj,x) \
{ TValue *i_o=(obj); i_o->value.b=(x); i_o->tt=LUA_TBOOLEAN; }
#define setsvalue(L,obj,x) \
{ TValue *i_o=(obj); \
i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TSTRING; \
checkliveness(G(L),i_o); }
#define setuvalue(L,obj,x) \
{ TValue *i_o=(obj); \
i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TUSERDATA; \
checkliveness(G(L),i_o); }
#define setthvalue(L,obj,x) \
{ TValue *i_o=(obj); \
i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TTHREAD; \
checkliveness(G(L),i_o); }
#define setclvalue(L,obj,x) \
{ TValue *i_o=(obj); \
i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TFUNCTION; \
checkliveness(G(L),i_o); }
#define sethvalue(L,obj,x) \
{ TValue *i_o=(obj); \
i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TTABLE; \
checkliveness(G(L),i_o); }
#define setptvalue(L,obj,x) \
{ TValue *i_o=(obj); \
i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TPROTO; \
checkliveness(G(L),i_o); }
#define setobj(L,obj1,obj2) \
{ const TValue *o2=(obj2); TValue *o1=(obj1); \
o1->value = o2->value; o1->tt=o2->tt; \
checkliveness(G(L),o1); }
/*
** different types of sets, according to destination
*/
/* from stack to (same) stack */
#define setobjs2s setobj
/* to stack (not from same stack) */
#define setobj2s setobj
#define setsvalue2s setsvalue
#define sethvalue2s sethvalue
#define setptvalue2s setptvalue
/* from table to same table */
#define setobjt2t setobj
/* to table */
#define setobj2t setobj
/* to new object */
#define setobj2n setobj
#define setsvalue2n setsvalue
#define setttype(obj, tt) (ttype(obj) = (tt))
#define iscollectable(o) (ttype(o) >= LUA_TSTRING)
typedef TValue *StkId; /* index to stack elements */
/*
** String headers for string table
*/
typedef union TString {
L_Umaxalign dummy; /* ensures maximum alignment for strings */
struct {
CommonHeader;
lu_byte reserved;
unsigned int hash;
size_t len;
} tsv;
} TString;
#define getstr(ts) cast(const char *, (ts) + 1)
#define svalue(o) getstr(rawtsvalue(o))
typedef union Udata {
L_Umaxalign dummy; /* ensures maximum alignment for `local' udata */
struct {
CommonHeader;
struct Table *metatable;
struct Table *env;
size_t len;
} uv;
} Udata;
/*
** Function Prototypes
*/
typedef struct Proto {
CommonHeader;
TValue *k; /* constants used by the function */
Instruction *code;
struct Proto **p; /* functions defined inside the function */
int *lineinfo; /* map from opcodes to source lines */
struct LocVar *locvars; /* information about local variables */
TString **upvalues; /* upvalue names */
TString *source;
int sizeupvalues;
int sizek; /* size of `k' */
int sizecode;
int sizelineinfo;
int sizep; /* size of `p' */
int sizelocvars;
int linedefined;
int lastlinedefined;
GCObject *gclist;
lu_byte nups; /* number of upvalues */
lu_byte numparams;
lu_byte is_vararg;
lu_byte maxstacksize;
} Proto;
/* masks for new-style vararg */
#define VARARG_HASARG 1
#define VARARG_ISVARARG 2
#define VARARG_NEEDSARG 4
typedef struct LocVar {
TString *varname;
int startpc; /* first point where variable is active */
int endpc; /* first point where variable is dead */
} LocVar;
/*
** Upvalues
*/
typedef struct UpVal {
CommonHeader;
TValue *v; /* points to stack or to its own value */
union {
TValue value; /* the value (when closed) */
struct { /* double linked list (when open) */
struct UpVal *prev;
struct UpVal *next;
} l;
} u;
} UpVal;
/*
** Closures
*/
#define ClosureHeader \
CommonHeader; lu_byte isC; lu_byte nupvalues; GCObject *gclist; \
struct Table *env
typedef struct CClosure {
ClosureHeader;
lua_CFunction f;
TValue upvalue[1];
} CClosure;
typedef struct LClosure {
ClosureHeader;
struct Proto *p;
UpVal *upvals[1];
} LClosure;
typedef union Closure {
CClosure c;
LClosure l;
} Closure;
#define iscfunction(o) (ttype(o) == LUA_TFUNCTION && clvalue(o)->c.isC)
#define isLfunction(o) (ttype(o) == LUA_TFUNCTION && !clvalue(o)->c.isC)
/*
** Tables
*/
typedef union TKey {
struct {
TValuefields;
struct Node *next; /* for chaining */
} nk;
TValue tvk;
} TKey;
typedef struct Node {
TValue i_val;
TKey i_key;
} Node;
typedef struct Table {
CommonHeader;
lu_byte flags; /* 1<<p means tagmethod(p) is not present */
lu_byte lsizenode; /* log2 of size of `node' array */
struct Table *metatable;
TValue *array; /* array part */
Node *node;
Node *lastfree; /* any free position is before this position */
GCObject *gclist;
int sizearray; /* size of `array' array */
} Table;
/*
** `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))
#define luaO_nilobject (&luaO_nilobject_)
LUAI_DATA const TValue luaO_nilobject_;
#define ceillog2(x) (luaO_log2((x)-1) + 1)
LUAI_FUNC int luaO_log2 (unsigned int x);
LUAI_FUNC int luaO_int2fb (unsigned int x);
LUAI_FUNC int luaO_fb2int (int x);
LUAI_FUNC int luaO_rawequalObj (const TValue *t1, const TValue *t2);
LUAI_FUNC int luaO_str2d (const char *s, lua_Number *result);
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 len);
#endif

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/*
** $Id: lopcodes.c,v 1.37.1.1 2007/12/27 13:02:25 roberto Exp $
** See Copyright Notice in lua.h
*/
#define lopcodes_c
#define LUA_CORE
#include "lopcodes.h"
/* ORDER OP */
const char *const luaP_opnames[NUM_OPCODES+1] = {
"MOVE",
"LOADK",
"LOADBOOL",
"LOADNIL",
"GETUPVAL",
"GETGLOBAL",
"GETTABLE",
"SETGLOBAL",
"SETUPVAL",
"SETTABLE",
"NEWTABLE",
"SELF",
"ADD",
"SUB",
"MUL",
"DIV",
"MOD",
"POW",
"UNM",
"NOT",
"LEN",
"CONCAT",
"JMP",
"EQ",
"LT",
"LE",
"TEST",
"TESTSET",
"CALL",
"TAILCALL",
"RETURN",
"FORLOOP",
"FORPREP",
"TFORLOOP",
"SETLIST",
"CLOSE",
"CLOSURE",
"VARARG",
NULL
};
#define opmode(t,a,b,c,m) (((t)<<7) | ((a)<<6) | ((b)<<4) | ((c)<<2) | (m))
const lu_byte luaP_opmodes[NUM_OPCODES] = {
/* T A B C mode opcode */
opmode(0, 1, OpArgR, OpArgN, iABC) /* OP_MOVE */
,opmode(0, 1, OpArgK, OpArgN, iABx) /* OP_LOADK */
,opmode(0, 1, OpArgU, OpArgU, iABC) /* OP_LOADBOOL */
,opmode(0, 1, OpArgR, OpArgN, iABC) /* OP_LOADNIL */
,opmode(0, 1, OpArgU, OpArgN, iABC) /* OP_GETUPVAL */
,opmode(0, 1, OpArgK, OpArgN, iABx) /* OP_GETGLOBAL */
,opmode(0, 1, OpArgR, OpArgK, iABC) /* OP_GETTABLE */
,opmode(0, 0, OpArgK, OpArgN, iABx) /* OP_SETGLOBAL */
,opmode(0, 0, OpArgU, OpArgN, iABC) /* OP_SETUPVAL */
,opmode(0, 0, OpArgK, OpArgK, iABC) /* OP_SETTABLE */
,opmode(0, 1, OpArgU, OpArgU, iABC) /* OP_NEWTABLE */
,opmode(0, 1, OpArgR, OpArgK, iABC) /* OP_SELF */
,opmode(0, 1, OpArgK, OpArgK, iABC) /* OP_ADD */
,opmode(0, 1, OpArgK, OpArgK, iABC) /* OP_SUB */
,opmode(0, 1, OpArgK, OpArgK, iABC) /* OP_MUL */
,opmode(0, 1, OpArgK, OpArgK, iABC) /* OP_DIV */
,opmode(0, 1, OpArgK, OpArgK, iABC) /* OP_MOD */
,opmode(0, 1, OpArgK, OpArgK, iABC) /* OP_POW */
,opmode(0, 1, OpArgR, OpArgN, iABC) /* OP_UNM */
,opmode(0, 1, OpArgR, OpArgN, iABC) /* OP_NOT */
,opmode(0, 1, OpArgR, OpArgN, iABC) /* OP_LEN */
,opmode(0, 1, OpArgR, OpArgR, iABC) /* OP_CONCAT */
,opmode(0, 0, OpArgR, OpArgN, iAsBx) /* OP_JMP */
,opmode(1, 0, OpArgK, OpArgK, iABC) /* OP_EQ */
,opmode(1, 0, OpArgK, OpArgK, iABC) /* OP_LT */
,opmode(1, 0, OpArgK, OpArgK, iABC) /* OP_LE */
,opmode(1, 1, OpArgR, OpArgU, iABC) /* OP_TEST */
,opmode(1, 1, OpArgR, OpArgU, iABC) /* OP_TESTSET */
,opmode(0, 1, OpArgU, OpArgU, iABC) /* OP_CALL */
,opmode(0, 1, OpArgU, OpArgU, iABC) /* OP_TAILCALL */
,opmode(0, 0, OpArgU, OpArgN, iABC) /* OP_RETURN */
,opmode(0, 1, OpArgR, OpArgN, iAsBx) /* OP_FORLOOP */
,opmode(0, 1, OpArgR, OpArgN, iAsBx) /* OP_FORPREP */
,opmode(1, 0, OpArgN, OpArgU, iABC) /* OP_TFORLOOP */
,opmode(0, 0, OpArgU, OpArgU, iABC) /* OP_SETLIST */
,opmode(0, 0, OpArgN, OpArgN, iABC) /* OP_CLOSE */
,opmode(0, 1, OpArgU, OpArgN, iABx) /* OP_CLOSURE */
,opmode(0, 1, OpArgU, OpArgN, iABC) /* OP_VARARG */
};

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/*
** $Id: lopcodes.h,v 1.125.1.1 2007/12/27 13:02:25 roberto Exp $
** Opcodes for Lua virtual machine
** See Copyright Notice in lua.h
*/
#ifndef lopcodes_h
#define lopcodes_h
#include "llimits.h"
/*===========================================================================
We assume that instructions are unsigned numbers.
All instructions have an opcode in the first 6 bits.
Instructions can have the following fields:
`A' : 8 bits
`B' : 9 bits
`C' : 9 bits
`Bx' : 18 bits (`B' and `C' together)
`sBx' : signed Bx
A signed argument is represented in excess K; that is, the number
value is the unsigned value minus K. K is exactly the maximum value
for that argument (so that -max is represented by 0, and +max is
represented by 2*max), which is half the maximum for the corresponding
unsigned argument.
===========================================================================*/
enum OpMode {iABC, iABx, iAsBx}; /* basic instruction format */
/*
** size and position of opcode arguments.
*/
#define SIZE_C 9
#define SIZE_B 9
#define SIZE_Bx (SIZE_C + SIZE_B)
#define SIZE_A 8
#define SIZE_OP 6
#define POS_OP 0
#define POS_A (POS_OP + SIZE_OP)
#define POS_C (POS_A + SIZE_A)
#define POS_B (POS_C + SIZE_C)
#define POS_Bx POS_C
/*
** limits for opcode arguments.
** we use (signed) int to manipulate most arguments,
** so they must fit in LUAI_BITSINT-1 bits (-1 for sign)
*/
#if SIZE_Bx < LUAI_BITSINT-1
#define MAXARG_Bx ((1<<SIZE_Bx)-1)
#define MAXARG_sBx (MAXARG_Bx>>1) /* `sBx' is signed */
#else
#define MAXARG_Bx MAX_INT
#define MAXARG_sBx MAX_INT
#endif
#define MAXARG_A ((1<<SIZE_A)-1)
#define MAXARG_B ((1<<SIZE_B)-1)
#define MAXARG_C ((1<<SIZE_C)-1)
/* 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 GETARG_A(i) (cast(int, ((i)>>POS_A) & MASK1(SIZE_A,0)))
#define SETARG_A(i,u) ((i) = (((i)&MASK0(SIZE_A,POS_A)) | \
((cast(Instruction, u)<<POS_A)&MASK1(SIZE_A,POS_A))))
#define GETARG_B(i) (cast(int, ((i)>>POS_B) & MASK1(SIZE_B,0)))
#define SETARG_B(i,b) ((i) = (((i)&MASK0(SIZE_B,POS_B)) | \
((cast(Instruction, b)<<POS_B)&MASK1(SIZE_B,POS_B))))
#define GETARG_C(i) (cast(int, ((i)>>POS_C) & MASK1(SIZE_C,0)))
#define SETARG_C(i,b) ((i) = (((i)&MASK0(SIZE_C,POS_C)) | \
((cast(Instruction, b)<<POS_C)&MASK1(SIZE_C,POS_C))))
#define GETARG_Bx(i) (cast(int, ((i)>>POS_Bx) & MASK1(SIZE_Bx,0)))
#define SETARG_Bx(i,b) ((i) = (((i)&MASK0(SIZE_Bx,POS_Bx)) | \
((cast(Instruction, b)<<POS_Bx)&MASK1(SIZE_Bx,POS_Bx))))
#define GETARG_sBx(i) (GETARG_Bx(i)-MAXARG_sBx)
#define SETARG_sBx(i,b) SETARG_Bx((i),cast(unsigned int, (b)+MAXARG_sBx))
#define CREATE_ABC(o,a,b,c) ((cast(Instruction, o)<<POS_OP) \
| (cast(Instruction, a)<<POS_A) \
| (cast(Instruction, b)<<POS_B) \
| (cast(Instruction, c)<<POS_C))
#define CREATE_ABx(o,a,bc) ((cast(Instruction, o)<<POS_OP) \
| (cast(Instruction, a)<<POS_A) \
| (cast(Instruction, bc)<<POS_Bx))
/*
** Macros to operate RK indices
*/
/* this bit 1 means constant (0 means register) */
#define BITRK (1 << (SIZE_B - 1))
/* test whether value is a constant */
#define ISK(x) ((x) & BITRK)
/* gets the index of the constant */
#define INDEXK(r) ((int)(r) & ~BITRK)
#define MAXINDEXRK (BITRK - 1)
/* code a constant index as a RK value */
#define RKASK(x) ((x) | BITRK)
/*
** invalid register that fits in 8 bits
*/
#define NO_REG MAXARG_A
/*
** R(x) - register
** Kst(x) - constant (in constant table)
** RK(x) == if ISK(x) then Kst(INDEXK(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_LOADK,/* A Bx R(A) := Kst(Bx) */
OP_LOADBOOL,/* A B C R(A) := (Bool)B; if (C) pc++ */
OP_LOADNIL,/* A B R(A) := ... := R(B) := nil */
OP_GETUPVAL,/* A B R(A) := UpValue[B] */
OP_GETGLOBAL,/* A Bx R(A) := Gbl[Kst(Bx)] */
OP_GETTABLE,/* A B C R(A) := R(B)[RK(C)] */
OP_SETGLOBAL,/* A Bx Gbl[Kst(Bx)] := R(A) */
OP_SETUPVAL,/* A B UpValue[B] := R(A) */
OP_SETTABLE,/* A B C R(A)[RK(B)] := RK(C) */
OP_NEWTABLE,/* A B C R(A) := {} (size = B,C) */
OP_SELF,/* A B C R(A+1) := R(B); R(A) := R(B)[RK(C)] */
OP_ADD,/* A B C R(A) := RK(B) + RK(C) */
OP_SUB,/* A B C R(A) := RK(B) - RK(C) */
OP_MUL,/* A B C R(A) := RK(B) * RK(C) */
OP_DIV,/* A B C R(A) := RK(B) / RK(C) */
OP_MOD,/* A B C R(A) := RK(B) % RK(C) */
OP_POW,/* A B C R(A) := RK(B) ^ RK(C) */
OP_UNM,/* 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 C R(A) := R(B).. ... ..R(C) */
OP_JMP,/* sBx pc+=sBx */
OP_EQ,/* A B C if ((RK(B) == RK(C)) ~= A) then pc++ */
OP_LT,/* A B C if ((RK(B) < RK(C)) ~= A) then pc++ */
OP_LE,/* A B C if ((RK(B) <= RK(C)) ~= A) then pc++ */
OP_TEST,/* A C if not (R(A) <=> C) then pc++ */
OP_TESTSET,/* A B C if (R(B) <=> C) then R(A) := R(B) else pc++ */
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 return R(A)(R(A+1), ... ,R(A+B-1)) */
OP_RETURN,/* A B return R(A), ... ,R(A+B-2) (see note) */
OP_FORLOOP,/* A sBx R(A)+=R(A+2);
if R(A) <?= R(A+1) then { pc+=sBx; R(A+3)=R(A) }*/
OP_FORPREP,/* A sBx R(A)-=R(A+2); pc+=sBx */
OP_TFORLOOP,/* A C R(A+3), ... ,R(A+2+C) := R(A)(R(A+1), R(A+2));
if R(A+3) ~= nil then R(A+2)=R(A+3) else pc++ */
OP_SETLIST,/* A B C R(A)[(C-1)*FPF+i] := R(A+i), 1 <= i <= B */
OP_CLOSE,/* A close all variables in the stack up to (>=) R(A)*/
OP_CLOSURE,/* A Bx R(A) := closure(KPROTO[Bx], R(A), ... ,R(A+n)) */
OP_VARARG/* A B R(A), R(A+1), ..., R(A+B-1) = vararg */
} OpCode;
#define NUM_OPCODES (cast(int, OP_VARARG) + 1)
/*===========================================================================
Notes:
(*) In OP_CALL, if (B == 0) then B = top. C is the number of returns - 1,
and can be 0: OP_CALL then sets `top' to last_result+1, so
next open instruction (OP_CALL, OP_RETURN, OP_SETLIST) may use `top'.
(*) In OP_VARARG, if (B == 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_SETLIST, if (B == 0) then B = `top';
if (C == 0) then next `instruction' is real C
(*) For comparisons, A specifies what condition the test should accept
(true or false).
(*) All `skips' (pc++) assume that next instruction is a jump
===========================================================================*/
/*
** masks for instruction properties. The format is:
** bits 0-1: op mode
** bits 2-3: C arg mode
** bits 4-5: B arg mode
** bit 6: instruction set register A
** bit 7: operator is a test
*/
enum OpArgMask {
OpArgN, /* argument is not used */
OpArgU, /* argument is used */
OpArgR, /* argument is a register or a jump offset */
OpArgK /* argument is a constant or register/constant */
};
LUAI_DATA const lu_byte luaP_opmodes[NUM_OPCODES];
#define getOpMode(m) (cast(enum OpMode, luaP_opmodes[m] & 3))
#define getBMode(m) (cast(enum OpArgMask, (luaP_opmodes[m] >> 4) & 3))
#define getCMode(m) (cast(enum OpArgMask, (luaP_opmodes[m] >> 2) & 3))
#define testAMode(m) (luaP_opmodes[m] & (1 << 6))
#define testTMode(m) (luaP_opmodes[m] & (1 << 7))
LUAI_DATA const char *const luaP_opnames[NUM_OPCODES+1]; /* opcode names */
/* number of list items to accumulate before a SETLIST instruction */
#define LFIELDS_PER_FLUSH 50
#endif

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/*
** $Id: loslib.c,v 1.19.1.3 2008/01/18 16:38:18 roberto Exp $
** Standard Operating System library
** See Copyright Notice in lua.h
*/
#include <errno.h>
#include <locale.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#define loslib_c
#define LUA_LIB
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
static int os_pushresult (lua_State *L, int i, const char *filename) {
int en = errno; /* calls to Lua API may change this value */
if (i) {
lua_pushboolean(L, 1);
return 1;
}
else {
lua_pushnil(L);
lua_pushfstring(L, "%s: %s", filename, strerror(en));
lua_pushinteger(L, en);
return 3;
}
}
static int os_execute (lua_State *L) {
lua_pushinteger(L, system(luaL_optstring(L, 1, NULL)));
return 1;
}
static int os_remove (lua_State *L) {
const char *filename = luaL_checkstring(L, 1);
return os_pushresult(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 os_pushresult(L, rename(fromname, toname) == 0, fromname);
}
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=? }
** =======================================================
*/
static void setfield (lua_State *L, const char *key, int value) {
lua_pushinteger(L, value);
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);
}
static int getboolfield (lua_State *L, const char *key) {
int res;
lua_getfield(L, -1, key);
res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);
lua_pop(L, 1);
return res;
}
static int getfield (lua_State *L, const char *key, int d) {
int res;
lua_getfield(L, -1, key);
if (lua_isnumber(L, -1))
res = (int)lua_tointeger(L, -1);
else {
if (d < 0)
return luaL_error(L, "field " LUA_QS " missing in date table", key);
res = d;
}
lua_pop(L, 1);
return res;
}
static int os_date (lua_State *L) {
const char *s = luaL_optstring(L, 1, "%c");
time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));
struct tm *stm;
if (*s == '!') { /* UTC? */
stm = gmtime(&t);
s++; /* skip `!' */
}
else
stm = localtime(&t);
if (stm == NULL) /* invalid date? */
lua_pushnil(L);
else if (strcmp(s, "*t") == 0) {
lua_createtable(L, 0, 9); /* 9 = number of fields */
setfield(L, "sec", stm->tm_sec);
setfield(L, "min", stm->tm_min);
setfield(L, "hour", stm->tm_hour);
setfield(L, "day", stm->tm_mday);
setfield(L, "month", stm->tm_mon+1);
setfield(L, "year", stm->tm_year+1900);
setfield(L, "wday", stm->tm_wday+1);
setfield(L, "yday", stm->tm_yday+1);
setboolfield(L, "isdst", stm->tm_isdst);
}
else {
char cc[3];
luaL_Buffer b;
cc[0] = '%'; cc[2] = '\0';
luaL_buffinit(L, &b);
for (; *s; s++) {
if (*s != '%' || *(s + 1) == '\0') /* no conversion specifier? */
luaL_addchar(&b, *s);
else {
size_t reslen;
char buff[200]; /* should be big enough for any conversion result */
cc[1] = *(++s);
reslen = strftime(buff, sizeof(buff), cc, stm);
luaL_addlstring(&b, buff, 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_sec = getfield(L, "sec", 0);
ts.tm_min = getfield(L, "min", 0);
ts.tm_hour = getfield(L, "hour", 12);
ts.tm_mday = getfield(L, "day", -1);
ts.tm_mon = getfield(L, "month", -1) - 1;
ts.tm_year = getfield(L, "year", -1) - 1900;
ts.tm_isdst = getboolfield(L, "isdst");
t = mktime(&ts);
}
if (t == (time_t)(-1))
lua_pushnil(L);
else
lua_pushnumber(L, (lua_Number)t);
return 1;
}
static int os_difftime (lua_State *L) {
lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
(time_t)(luaL_optnumber(L, 2, 0))));
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) {
exit(luaL_optint(L, 1, EXIT_SUCCESS));
}
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}
};
/* }====================================================== */
LUALIB_API int luaopen_os (lua_State *L) {
luaL_register(L, LUA_OSLIBNAME, syslib);
return 1;
}

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/*
** $Id: lparser.h,v 1.57.1.1 2007/12/27 13:02:25 roberto Exp $
** Lua Parser
** See Copyright Notice in lua.h
*/
#ifndef lparser_h
#define lparser_h
#include "llimits.h"
#include "lobject.h"
#include "lzio.h"
/*
** Expression descriptor
*/
typedef enum {
VVOID, /* no value */
VNIL,
VTRUE,
VFALSE,
VK, /* info = index of constant in `k' */
VKNUM, /* nval = numerical value */
VLOCAL, /* info = local register */
VUPVAL, /* info = index of upvalue in `upvalues' */
VGLOBAL, /* info = index of table; aux = index of global name in `k' */
VINDEXED, /* info = table register; aux = index register (or `k') */
VJMP, /* info = instruction pc */
VRELOCABLE, /* info = instruction pc */
VNONRELOC, /* info = result register */
VCALL, /* info = instruction pc */
VVARARG /* info = instruction pc */
} expkind;
typedef struct expdesc {
expkind k;
union {
struct { int info, aux; } s;
lua_Number nval;
} u;
int t; /* patch list of `exit when true' */
int f; /* patch list of `exit when false' */
} expdesc;
typedef struct upvaldesc {
lu_byte k;
lu_byte info;
} upvaldesc;
struct BlockCnt; /* defined in lparser.c */
/* state needed to generate code for a given function */
typedef struct FuncState {
Proto *f; /* current function header */
Table *h; /* table to find (and reuse) elements in `k' */
struct FuncState *prev; /* enclosing function */
struct LexState *ls; /* lexical state */
struct lua_State *L; /* copy of the Lua state */
struct BlockCnt *bl; /* chain of current blocks */
int pc; /* next position to code (equivalent to `ncode') */
int lasttarget; /* `pc' of last `jump target' */
int jpc; /* list of pending jumps to `pc' */
int freereg; /* first free register */
int nk; /* number of elements in `k' */
int np; /* number of elements in `p' */
short nlocvars; /* number of elements in `locvars' */
lu_byte nactvar; /* number of active local variables */
upvaldesc upvalues[LUAI_MAXUPVALUES]; /* upvalues */
unsigned short actvar[LUAI_MAXVARS]; /* declared-variable stack */
} FuncState;
LUAI_FUNC Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff,
const char *name);
#endif

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/*
** $Id: lstate.c,v 2.36.1.2 2008/01/03 15:20:39 roberto Exp $
** Global State
** See Copyright Notice in lua.h
*/
#include <stddef.h>
#define lstate_c
#define LUA_CORE
#include "lua.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"
#define state_size(x) (sizeof(x) + LUAI_EXTRASPACE)
#define fromstate(l) (cast(lu_byte *, (l)) - LUAI_EXTRASPACE)
#define tostate(l) (cast(lua_State *, cast(lu_byte *, l) + LUAI_EXTRASPACE))
/*
** Main thread combines a thread state and the global state
*/
typedef struct LG {
lua_State l;
global_State g;
} LG;
static void stack_init (lua_State *L1, lua_State *L) {
/* initialize CallInfo array */
L1->base_ci = luaM_newvector(L, BASIC_CI_SIZE, CallInfo);
L1->ci = L1->base_ci;
L1->size_ci = BASIC_CI_SIZE;
L1->end_ci = L1->base_ci + L1->size_ci - 1;
/* initialize stack array */
L1->stack = luaM_newvector(L, BASIC_STACK_SIZE + EXTRA_STACK, TValue);
L1->stacksize = BASIC_STACK_SIZE + EXTRA_STACK;
L1->top = L1->stack;
L1->stack_last = L1->stack+(L1->stacksize - EXTRA_STACK)-1;
/* initialize first ci */
L1->ci->func = L1->top;
setnilvalue(L1->top++); /* `function' entry for this `ci' */
L1->base = L1->ci->base = L1->top;
L1->ci->top = L1->top + LUA_MINSTACK;
}
static void freestack (lua_State *L, lua_State *L1) {
luaM_freearray(L, L1->base_ci, L1->size_ci, CallInfo);
luaM_freearray(L, L1->stack, L1->stacksize, TValue);
}
/*
** open parts that may cause memory-allocation errors
*/
static void f_luaopen (lua_State *L, void *ud) {
global_State *g = G(L);
UNUSED(ud);
stack_init(L, L); /* init stack */
sethvalue(L, gt(L), luaH_new(L, 0, 2)); /* table of globals */
sethvalue(L, registry(L), luaH_new(L, 0, 2)); /* registry */
luaS_resize(L, MINSTRTABSIZE); /* initial size of string table */
luaT_init(L);
luaX_init(L);
luaS_fix(luaS_newliteral(L, MEMERRMSG));
g->GCthreshold = 4*g->totalbytes;
}
static void preinit_state (lua_State *L, global_State *g) {
G(L) = g;
L->stack = NULL;
L->stacksize = 0;
L->errorJmp = NULL;
L->hook = NULL;
L->hookmask = 0;
L->basehookcount = 0;
L->allowhook = 1;
resethookcount(L);
L->openupval = NULL;
L->size_ci = 0;
L->nCcalls = L->baseCcalls = 0;
L->status = 0;
L->base_ci = L->ci = NULL;
L->savedpc = NULL;
L->errfunc = 0;
setnilvalue(gt(L));
}
static void close_state (lua_State *L) {
global_State *g = G(L);
luaF_close(L, L->stack); /* close all upvalues for this thread */
luaC_freeall(L); /* collect all objects */
lua_assert(g->rootgc == obj2gco(L));
lua_assert(g->strt.nuse == 0);
luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size, TString *);
luaZ_freebuffer(L, &g->buff);
freestack(L, L);
lua_assert(g->totalbytes == sizeof(LG));
(*g->frealloc)(g->ud, fromstate(L), state_size(LG), 0);
}
lua_State *luaE_newthread (lua_State *L) {
lua_State *L1 = tostate(luaM_malloc(L, state_size(lua_State)));
luaC_link(L, obj2gco(L1), LUA_TTHREAD);
preinit_state(L1, G(L));
stack_init(L1, L); /* init stack */
setobj2n(L, gt(L1), gt(L)); /* share table of globals */
L1->hookmask = L->hookmask;
L1->basehookcount = L->basehookcount;
L1->hook = L->hook;
resethookcount(L1);
lua_assert(iswhite(obj2gco(L1)));
return L1;
}
void luaE_freethread (lua_State *L, lua_State *L1) {
luaF_close(L1, L1->stack); /* close all upvalues for this thread */
lua_assert(L1->openupval == NULL);
luai_userstatefree(L1);
freestack(L, L1);
luaM_freemem(L, fromstate(L1), state_size(lua_State));
}
LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
int i;
lua_State *L;
global_State *g;
void *l = (*f)(ud, NULL, 0, state_size(LG));
if (l == NULL) return NULL;
L = tostate(l);
g = &((LG *)L)->g;
L->next = NULL;
L->tt = LUA_TTHREAD;
g->currentwhite = bit2mask(WHITE0BIT, FIXEDBIT);
L->marked = luaC_white(g);
set2bits(L->marked, FIXEDBIT, SFIXEDBIT);
preinit_state(L, g);
g->frealloc = f;
g->ud = ud;
g->mainthread = L;
g->uvhead.u.l.prev = &g->uvhead;
g->uvhead.u.l.next = &g->uvhead;
g->GCthreshold = 0; /* mark it as unfinished state */
g->strt.size = 0;
g->strt.nuse = 0;
g->strt.hash = NULL;
setnilvalue(registry(L));
luaZ_initbuffer(L, &g->buff);
g->panic = NULL;
g->gcstate = GCSpause;
g->rootgc = obj2gco(L);
g->sweepstrgc = 0;
g->sweepgc = &g->rootgc;
g->gray = NULL;
g->grayagain = NULL;
g->weak = NULL;
g->tmudata = NULL;
g->totalbytes = sizeof(LG);
g->gcpause = LUAI_GCPAUSE;
g->gcstepmul = LUAI_GCMUL;
g->gcdept = 0;
for (i=0; i<NUM_TAGS; i++) g->mt[i] = NULL;
if (luaD_rawrunprotected(L, f_luaopen, NULL) != 0) {
/* memory allocation error: free partial state */
close_state(L);
L = NULL;
}
else
luai_userstateopen(L);
return L;
}
static void callallgcTM (lua_State *L, void *ud) {
UNUSED(ud);
luaC_callGCTM(L); /* call GC metamethods for all udata */
}
LUA_API void lua_close (lua_State *L) {
L = G(L)->mainthread; /* only the main thread can be closed */
lua_lock(L);
luaF_close(L, L->stack); /* close all upvalues for this thread */
luaC_separateudata(L, 1); /* separate udata that have GC metamethods */
L->errfunc = 0; /* no error function during GC metamethods */
do { /* repeat until no more errors */
L->ci = L->base_ci;
L->base = L->top = L->ci->base;
L->nCcalls = L->baseCcalls = 0;
} while (luaD_rawrunprotected(L, callallgcTM, NULL) != 0);
lua_assert(G(L)->tmudata == NULL);
luai_userstateclose(L);
close_state(L);
}

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/*
** $Id: lstate.h,v 2.24.1.2 2008/01/03 15:20:39 roberto Exp $
** 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"
struct lua_longjmp; /* defined in ldo.c */
/* table of globals */
#define gt(L) (&L->l_gt)
/* registry */
#define registry(L) (&G(L)->l_registry)
/* extra stack space to handle TM calls and some other extras */
#define EXTRA_STACK 5
#define BASIC_CI_SIZE 8
#define BASIC_STACK_SIZE (2*LUA_MINSTACK)
typedef struct stringtable {
GCObject **hash;
lu_int32 nuse; /* number of elements */
int size;
} stringtable;
/*
** informations about a call
*/
typedef struct CallInfo {
StkId base; /* base for this function */
StkId func; /* function index in the stack */
StkId top; /* top for this function */
const Instruction *savedpc;
int nresults; /* expected number of results from this function */
int tailcalls; /* number of tail calls lost under this entry */
} CallInfo;
#define curr_func(L) (clvalue(L->ci->func))
#define ci_func(ci) (clvalue((ci)->func))
#define f_isLua(ci) (!ci_func(ci)->c.isC)
#define isLua(ci) (ttisfunction((ci)->func) && f_isLua(ci))
/*
** `global state', shared by all threads of this state
*/
typedef struct global_State {
stringtable strt; /* hash table for strings */
lua_Alloc frealloc; /* function to reallocate memory */
void *ud; /* auxiliary data to `frealloc' */
lu_byte currentwhite;
lu_byte gcstate; /* state of garbage collector */
int sweepstrgc; /* position of sweep in `strt' */
GCObject *rootgc; /* list of all collectable objects */
GCObject **sweepgc; /* position of sweep in `rootgc' */
GCObject *gray; /* list of gray objects */
GCObject *grayagain; /* list of objects to be traversed atomically */
GCObject *weak; /* list of weak tables (to be cleared) */
GCObject *tmudata; /* last element of list of userdata to be GC */
Mbuffer buff; /* temporary buffer for string concatentation */
lu_mem GCthreshold;
lu_mem totalbytes; /* number of bytes currently allocated */
lu_mem estimate; /* an estimate of number of bytes actually in use */
lu_mem gcdept; /* how much GC is `behind schedule' */
int gcpause; /* size of pause between successive GCs */
int gcstepmul; /* GC `granularity' */
lua_CFunction panic; /* to be called in unprotected errors */
TValue l_registry;
struct lua_State *mainthread;
UpVal uvhead; /* head of double-linked list of all open upvalues */
struct Table *mt[NUM_TAGS]; /* metatables for basic types */
TString *tmname[TM_N]; /* array with tag-method names */
} global_State;
/*
** `per thread' state
*/
struct lua_State {
CommonHeader;
lu_byte status;
StkId top; /* first free slot in the stack */
StkId base; /* base of current function */
global_State *l_G;
CallInfo *ci; /* call info for current function */
const Instruction *savedpc; /* `savedpc' of current function */
StkId stack_last; /* last free slot in the stack */
StkId stack; /* stack base */
CallInfo *end_ci; /* points after end of ci array*/
CallInfo *base_ci; /* array of CallInfo's */
int stacksize;
int size_ci; /* size of array `base_ci' */
unsigned short nCcalls; /* number of nested C calls */
unsigned short baseCcalls; /* nested C calls when resuming coroutine */
lu_byte hookmask;
lu_byte allowhook;
int basehookcount;
int hookcount;
lua_Hook hook;
TValue l_gt; /* table of globals */
TValue env; /* temporary place for environments */
GCObject *openupval; /* list of open upvalues in this stack */
GCObject *gclist;
struct lua_longjmp *errorJmp; /* current error recover point */
ptrdiff_t errfunc; /* current error handling function (stack index) */
};
#define G(L) (L->l_G)
/*
** Union of all collectable objects
*/
union GCObject {
GCheader gch;
union TString ts;
union Udata u;
union Closure cl;
struct Table h;
struct Proto p;
struct UpVal uv;
struct lua_State th; /* thread */
};
/* macros to convert a GCObject into a specific value */
#define rawgco2ts(o) check_exp((o)->gch.tt == LUA_TSTRING, &((o)->ts))
#define gco2ts(o) (&rawgco2ts(o)->tsv)
#define rawgco2u(o) check_exp((o)->gch.tt == LUA_TUSERDATA, &((o)->u))
#define gco2u(o) (&rawgco2u(o)->uv)
#define gco2cl(o) check_exp((o)->gch.tt == LUA_TFUNCTION, &((o)->cl))
#define gco2h(o) check_exp((o)->gch.tt == LUA_TTABLE, &((o)->h))
#define gco2p(o) check_exp((o)->gch.tt == LUA_TPROTO, &((o)->p))
#define gco2uv(o) check_exp((o)->gch.tt == LUA_TUPVAL, &((o)->uv))
#define ngcotouv(o) \
check_exp((o) == NULL || (o)->gch.tt == LUA_TUPVAL, &((o)->uv))
#define gco2th(o) check_exp((o)->gch.tt == LUA_TTHREAD, &((o)->th))
/* macro to convert any Lua object into a GCObject */
#define obj2gco(v) (cast(GCObject *, (v)))
LUAI_FUNC lua_State *luaE_newthread (lua_State *L);
LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1);
#endif

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/*
** $Id: lstring.c,v 2.8.1.1 2007/12/27 13:02:25 roberto Exp $
** String table (keeps all strings handled by Lua)
** See Copyright Notice in lua.h
*/
#include <string.h>
#define lstring_c
#define LUA_CORE
#include "lua.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
#include "lstring.h"
void luaS_resize (lua_State *L, int newsize) {
GCObject **newhash;
stringtable *tb;
int i;
if (G(L)->gcstate == GCSsweepstring)
return; /* cannot resize during GC traverse */
newhash = luaM_newvector(L, newsize, GCObject *);
tb = &G(L)->strt;
for (i=0; i<newsize; i++) newhash[i] = NULL;
/* rehash */
for (i=0; i<tb->size; i++) {
GCObject *p = tb->hash[i];
while (p) { /* for each node in the list */
GCObject *next = p->gch.next; /* save next */
unsigned int h = gco2ts(p)->hash;
int h1 = lmod(h, newsize); /* new position */
lua_assert(cast_int(h%newsize) == lmod(h, newsize));
p->gch.next = newhash[h1]; /* chain it */
newhash[h1] = p;
p = next;
}
}
luaM_freearray(L, tb->hash, tb->size, TString *);
tb->size = newsize;
tb->hash = newhash;
}
static TString *newlstr (lua_State *L, const char *str, size_t l,
unsigned int h) {
TString *ts;
stringtable *tb;
if (l+1 > (MAX_SIZET - sizeof(TString))/sizeof(char))
luaM_toobig(L);
ts = cast(TString *, luaM_malloc(L, (l+1)*sizeof(char)+sizeof(TString)));
ts->tsv.len = l;
ts->tsv.hash = h;
ts->tsv.marked = luaC_white(G(L));
ts->tsv.tt = LUA_TSTRING;
ts->tsv.reserved = 0;
memcpy(ts+1, str, l*sizeof(char));
((char *)(ts+1))[l] = '\0'; /* ending 0 */
tb = &G(L)->strt;
h = lmod(h, tb->size);
ts->tsv.next = tb->hash[h]; /* chain new entry */
tb->hash[h] = obj2gco(ts);
tb->nuse++;
if (tb->nuse > cast(lu_int32, tb->size) && tb->size <= MAX_INT/2)
luaS_resize(L, tb->size*2); /* too crowded */
return ts;
}
TString *luaS_newlstr (lua_State *L, const char *str, size_t l) {
GCObject *o;
unsigned int h = cast(unsigned int, l); /* seed */
size_t step = (l>>5)+1; /* if string is too long, don't hash all its chars */
size_t l1;
for (l1=l; l1>=step; l1-=step) /* compute hash */
h = h ^ ((h<<5)+(h>>2)+cast(unsigned char, str[l1-1]));
for (o = G(L)->strt.hash[lmod(h, G(L)->strt.size)];
o != NULL;
o = o->gch.next) {
TString *ts = rawgco2ts(o);
if (ts->tsv.len == l && (memcmp(str, getstr(ts), l) == 0)) {
/* string may be dead */
if (isdead(G(L), o)) changewhite(o);
return ts;
}
}
return newlstr(L, str, l, h); /* not found */
}
Udata *luaS_newudata (lua_State *L, size_t s, Table *e) {
Udata *u;
if (s > MAX_SIZET - sizeof(Udata))
luaM_toobig(L);
u = cast(Udata *, luaM_malloc(L, s + sizeof(Udata)));
u->uv.marked = luaC_white(G(L)); /* is not finalized */
u->uv.tt = LUA_TUSERDATA;
u->uv.len = s;
u->uv.metatable = NULL;
u->uv.env = e;
/* chain it on udata list (after main thread) */
u->uv.next = G(L)->mainthread->next;
G(L)->mainthread->next = obj2gco(u);
return u;
}

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/*
** $Id: lstring.h,v 1.43.1.1 2007/12/27 13:02:25 roberto Exp $
** 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"
#define sizestring(s) (sizeof(union TString)+((s)->len+1)*sizeof(char))
#define sizeudata(u) (sizeof(union Udata)+(u)->len)
#define luaS_new(L, s) (luaS_newlstr(L, s, strlen(s)))
#define luaS_newliteral(L, s) (luaS_newlstr(L, "" s, \
(sizeof(s)/sizeof(char))-1))
#define luaS_fix(s) l_setbit((s)->tsv.marked, FIXEDBIT)
LUAI_FUNC void luaS_resize (lua_State *L, int newsize);
LUAI_FUNC Udata *luaS_newudata (lua_State *L, size_t s, Table *e);
LUAI_FUNC TString *luaS_newlstr (lua_State *L, const char *str, size_t l);
#endif

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/*
** $Id: lstrlib.c,v 1.132.1.5 2010/05/14 15:34:19 roberto Exp $
** Standard library for string operations and pattern-matching
** See Copyright Notice in lua.h
*/
#include <ctype.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define lstrlib_c
#define LUA_LIB
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
/* macro to `unsign' a character */
#define uchar(c) ((unsigned char)(c))
static int str_len (lua_State *L) {
size_t l;
luaL_checklstring(L, 1, &l);
lua_pushinteger(L, l);
return 1;
}
static ptrdiff_t posrelat (ptrdiff_t pos, size_t len) {
/* relative string position: negative means back from end */
if (pos < 0) pos += (ptrdiff_t)len + 1;
return (pos >= 0) ? pos : 0;
}
static int str_sub (lua_State *L) {
size_t l;
const char *s = luaL_checklstring(L, 1, &l);
ptrdiff_t start = posrelat(luaL_checkinteger(L, 2), l);
ptrdiff_t end = posrelat(luaL_optinteger(L, 3, -1), l);
if (start < 1) start = 1;
if (end > (ptrdiff_t)l) end = (ptrdiff_t)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;
luaL_Buffer b;
const char *s = luaL_checklstring(L, 1, &l);
luaL_buffinit(L, &b);
while (l--) luaL_addchar(&b, s[l]);
luaL_pushresult(&b);
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);
luaL_buffinit(L, &b);
for (i=0; i<l; i++)
luaL_addchar(&b, tolower(uchar(s[i])));
luaL_pushresult(&b);
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);
luaL_buffinit(L, &b);
for (i=0; i<l; i++)
luaL_addchar(&b, toupper(uchar(s[i])));
luaL_pushresult(&b);
return 1;
}
static int str_rep (lua_State *L) {
size_t l;
luaL_Buffer b;
const char *s = luaL_checklstring(L, 1, &l);
int n = luaL_checkint(L, 2);
luaL_buffinit(L, &b);
while (n-- > 0)
luaL_addlstring(&b, s, l);
luaL_pushresult(&b);
return 1;
}
static int str_byte (lua_State *L) {
size_t l;
const char *s = luaL_checklstring(L, 1, &l);
ptrdiff_t posi = posrelat(luaL_optinteger(L, 2, 1), l);
ptrdiff_t pose = posrelat(luaL_optinteger(L, 3, posi), l);
int n, i;
if (posi <= 0) posi = 1;
if ((size_t)pose > l) pose = l;
if (posi > pose) return 0; /* empty interval; return no values */
n = (int)(pose - posi + 1);
if (posi + n <= pose) /* overflow? */
luaL_error(L, "string slice too long");
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;
luaL_buffinit(L, &b);
for (i=1; i<=n; i++) {
int c = luaL_checkint(L, i);
luaL_argcheck(L, uchar(c) == c, i, "invalid value");
luaL_addchar(&b, uchar(c));
}
luaL_pushresult(&b);
return 1;
}
static int writer (lua_State *L, const void* b, size_t size, void* B) {
(void)L;
luaL_addlstring((luaL_Buffer*) B, (const char *)b, size);
return 0;
}
static int str_dump (lua_State *L) {
luaL_Buffer b;
luaL_checktype(L, 1, LUA_TFUNCTION);
lua_settop(L, 1);
luaL_buffinit(L,&b);
if (lua_dump(L, writer, &b) != 0)
luaL_error(L, "unable to dump given function");
luaL_pushresult(&b);
return 1;
}
/*
** {======================================================
** 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 */
lua_State *L;
int level; /* total number of captures (finished or unfinished) */
struct {
const char *init;
ptrdiff_t len;
} capture[LUA_MAXCAPTURES];
} MatchState;
#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");
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 == '\0')
luaL_error(ms->L, "malformed pattern (ends with " LUA_QL("%%") ")");
return p+1;
}
case '[': {
if (*p == '^') p++;
do { /* look for a `]' */
if (*p == '\0')
luaL_error(ms->L, "malformed pattern (missing " LUA_QL("]") ")");
if (*(p++) == L_ESC && *p != '\0')
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 '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;
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 (int c, const char *p, const char *ep) {
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 *match (MatchState *ms, const char *s, const char *p);
static const char *matchbalance (MatchState *ms, const char *s,
const char *p) {
if (*p == 0 || *(p+1) == 0)
luaL_error(ms->L, "unbalanced pattern");
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 ((s+i)<ms->src_end && singlematch(uchar(*(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 (s<ms->src_end && singlematch(uchar(*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) {
init: /* using goto's to optimize tail recursion */
switch (*p) {
case '(': { /* start capture */
if (*(p+1) == ')') /* position capture? */
return start_capture(ms, s, p+2, CAP_POSITION);
else
return start_capture(ms, s, p+1, CAP_UNFINISHED);
}
case ')': { /* end capture */
return end_capture(ms, s, p+1);
}
case L_ESC: {
switch (*(p+1)) {
case 'b': { /* balanced string? */
s = matchbalance(ms, s, p+2);
if (s == NULL) return NULL;
p+=4; goto init; /* else return match(ms, s, p+4); */
}
case 'f': { /* frontier? */
const char *ep; char previous;
p += 2;
if (*p != '[')
luaL_error(ms->L, "missing " LUA_QL("[") " after "
LUA_QL("%%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)) return NULL;
p=ep; goto init; /* else return match(ms, s, ep); */
}
default: {
if (isdigit(uchar(*(p+1)))) { /* capture results (%0-%9)? */
s = match_capture(ms, s, uchar(*(p+1)));
if (s == NULL) return NULL;
p+=2; goto init; /* else return match(ms, s, p+2) */
}
goto dflt; /* case default */
}
}
}
case '\0': { /* end of pattern */
return s; /* match succeeded */
}
case '$': {
if (*(p+1) == '\0') /* is the `$' the last char in pattern? */
return (s == ms->src_end) ? s : NULL; /* check end of string */
else goto dflt;
}
default: dflt: { /* it is a pattern item */
const char *ep = classend(ms, p); /* points to what is next */
int m = s<ms->src_end && singlematch(uchar(*s), p, ep);
switch (*ep) {
case '?': { /* optional */
const char *res;
if (m && ((res=match(ms, s+1, ep+1)) != NULL))
return res;
p=ep+1; goto init; /* else return match(ms, s, ep+1); */
}
case '*': { /* 0 or more repetitions */
return max_expand(ms, s, p, ep);
}
case '+': { /* 1 or more repetitions */
return (m ? max_expand(ms, s+1, p, ep) : NULL);
}
case '-': { /* 0 or more repetitions (minimum) */
return min_expand(ms, s, p, ep);
}
default: {
if (!m) return NULL;
s++; p=ep; goto init; /* else return match(ms, s+1, ep); */
}
}
}
}
}
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 */
}
}
static void push_onecapture (MatchState *ms, int i, const char *s,
const char *e) {
if (i >= ms->level) {
if (i == 0) /* ms->level == 0, too */
lua_pushlstring(ms->L, s, e - s); /* add whole match */
else
luaL_error(ms->L, "invalid capture index");
}
else {
ptrdiff_t l = ms->capture[i].len;
if (l == CAP_UNFINISHED) luaL_error(ms->L, "unfinished capture");
if (l == CAP_POSITION)
lua_pushinteger(ms->L, ms->capture[i].init - ms->src_init + 1);
else
lua_pushlstring(ms->L, ms->capture[i].init, l);
}
}
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 */
}
static int str_find_aux (lua_State *L, int find) {
size_t l1, l2;
const char *s = luaL_checklstring(L, 1, &l1);
const char *p = luaL_checklstring(L, 2, &l2);
ptrdiff_t init = posrelat(luaL_optinteger(L, 3, 1), l1) - 1;
if (init < 0) init = 0;
else if ((size_t)(init) > l1) init = (ptrdiff_t)l1;
if (find && (lua_toboolean(L, 4) || /* explicit request? */
strpbrk(p, SPECIALS) == NULL)) { /* or no special characters? */
/* do a plain search */
const char *s2 = lmemfind(s+init, l1-init, p, l2);
if (s2) {
lua_pushinteger(L, s2-s+1);
lua_pushinteger(L, s2-s+l2);
return 2;
}
}
else {
MatchState ms;
int anchor = (*p == '^') ? (p++, 1) : 0;
const char *s1=s+init;
ms.L = L;
ms.src_init = s;
ms.src_end = s+l1;
do {
const char *res;
ms.level = 0;
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);
}
lua_pushnil(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);
}
static int gmatch_aux (lua_State *L) {
MatchState ms;
size_t ls;
const char *s = lua_tolstring(L, lua_upvalueindex(1), &ls);
const char *p = lua_tostring(L, lua_upvalueindex(2));
const char *src;
ms.L = L;
ms.src_init = s;
ms.src_end = s+ls;
for (src = s + (size_t)lua_tointeger(L, lua_upvalueindex(3));
src <= ms.src_end;
src++) {
const char *e;
ms.level = 0;
if ((e = match(&ms, src, p)) != NULL) {
lua_Integer newstart = e-s;
if (e == src) newstart++; /* empty match? go at least one position */
lua_pushinteger(L, newstart);
lua_replace(L, lua_upvalueindex(3));
return push_captures(&ms, src, e);
}
}
return 0; /* not found */
}
static int gmatch (lua_State *L) {
luaL_checkstring(L, 1);
luaL_checkstring(L, 2);
lua_settop(L, 2);
lua_pushinteger(L, 0);
lua_pushcclosure(L, gmatch_aux, 3);
return 1;
}
static int gfind_nodef (lua_State *L) {
return luaL_error(L, LUA_QL("string.gfind") " was renamed to "
LUA_QL("string.gmatch"));
}
static void add_s (MatchState *ms, luaL_Buffer *b, const char *s,
const char *e) {
size_t l, i;
const char *news = lua_tolstring(ms->L, 3, &l);
for (i = 0; i < l; i++) {
if (news[i] != L_ESC)
luaL_addchar(b, news[i]);
else {
i++; /* skip ESC */
if (!isdigit(uchar(news[i])))
luaL_addchar(b, news[i]);
else if (news[i] == '0')
luaL_addlstring(b, s, e - s);
else {
push_onecapture(ms, news[i] - '1', s, e);
luaL_addvalue(b); /* add capture to accumulated result */
}
}
}
}
static void add_value (MatchState *ms, luaL_Buffer *b, const char *s,
const char *e) {
lua_State *L = ms->L;
switch (lua_type(L, 3)) {
case LUA_TNUMBER:
case LUA_TSTRING: {
add_s(ms, b, s, e);
return;
}
case LUA_TFUNCTION: {
int n;
lua_pushvalue(L, 3);
n = push_captures(ms, s, e);
lua_call(L, n, 1);
break;
}
case LUA_TTABLE: {
push_onecapture(ms, 0, s, e);
lua_gettable(L, 3);
break;
}
}
if (!lua_toboolean(L, -1)) { /* nil or false? */
lua_pop(L, 1);
lua_pushlstring(L, s, e - s); /* keep original text */
}
else if (!lua_isstring(L, -1))
luaL_error(L, "invalid replacement value (a %s)", luaL_typename(L, -1));
luaL_addvalue(b); /* add result to accumulator */
}
static int str_gsub (lua_State *L) {
size_t srcl;
const char *src = luaL_checklstring(L, 1, &srcl);
const char *p = luaL_checkstring(L, 2);
int tr = lua_type(L, 3);
int max_s = luaL_optint(L, 4, srcl+1);
int anchor = (*p == '^') ? (p++, 1) : 0;
int n = 0;
MatchState ms;
luaL_Buffer b;
luaL_argcheck(L, tr == LUA_TNUMBER || tr == LUA_TSTRING ||
tr == LUA_TFUNCTION || tr == LUA_TTABLE, 3,
"string/function/table expected");
luaL_buffinit(L, &b);
ms.L = L;
ms.src_init = src;
ms.src_end = src+srcl;
while (n < max_s) {
const char *e;
ms.level = 0;
e = match(&ms, src, p);
if (e) {
n++;
add_value(&ms, &b, src, e);
}
if (e && e>src) /* non empty match? */
src = e; /* skip it */
else if (src < ms.src_end)
luaL_addchar(&b, *src++);
else break;
if (anchor) break;
}
luaL_addlstring(&b, src, ms.src_end-src);
luaL_pushresult(&b);
lua_pushinteger(L, n); /* number of substitutions */
return 2;
}
/* }====================================================== */
/* maximum size of each formatted item (> len(format('%99.99f', -1e308))) */
#define MAX_ITEM 512
/* valid flags in a format specification */
#define FLAGS "-+ #0"
/*
** maximum size of each format specification (such as '%-099.99d')
** (+10 accounts for %99.99x plus margin of error)
*/
#define MAX_FORMAT (sizeof(FLAGS) + sizeof(LUA_INTFRMLEN) + 10)
static void addquoted (lua_State *L, luaL_Buffer *b, int arg) {
size_t l;
const char *s = luaL_checklstring(L, arg, &l);
luaL_addchar(b, '"');
while (l--) {
switch (*s) {
case '"': case '\\': case '\n': {
luaL_addchar(b, '\\');
luaL_addchar(b, *s);
break;
}
case '\r': {
luaL_addlstring(b, "\\r", 2);
break;
}
case '\0': {
luaL_addlstring(b, "\\000", 4);
break;
}
default: {
luaL_addchar(b, *s);
break;
}
}
s++;
}
luaL_addchar(b, '"');
}
static const char *scanformat (lua_State *L, const char *strfrmt, char *form) {
const char *p = strfrmt;
while (*p != '\0' && strchr(FLAGS, *p) != NULL) p++; /* skip flags */
if ((size_t)(p - strfrmt) >= sizeof(FLAGS))
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++) = '%';
strncpy(form, strfrmt, p - strfrmt + 1);
form += p - strfrmt + 1;
*form = '\0';
return p;
}
static void addintlen (char *form) {
size_t l = strlen(form);
char spec = form[l - 1];
strcpy(form + l - 1, LUA_INTFRMLEN);
form[l + sizeof(LUA_INTFRMLEN) - 2] = spec;
form[l + sizeof(LUA_INTFRMLEN) - 1] = '\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 (`%...') */
char buff[MAX_ITEM]; /* to store the formatted item */
if (++arg > top)
luaL_argerror(L, arg, "no value");
strfrmt = scanformat(L, strfrmt, form);
switch (*strfrmt++) {
case 'c': {
sprintf(buff, form, (int)luaL_checknumber(L, arg));
break;
}
case 'd': case 'i': {
addintlen(form);
sprintf(buff, form, (LUA_INTFRM_T)luaL_checknumber(L, arg));
break;
}
case 'o': case 'u': case 'x': case 'X': {
addintlen(form);
sprintf(buff, form, (unsigned LUA_INTFRM_T)luaL_checknumber(L, arg));
break;
}
case 'e': case 'E': case 'f':
case 'g': case 'G': {
sprintf(buff, form, (double)luaL_checknumber(L, arg));
break;
}
case 'q': {
addquoted(L, &b, arg);
continue; /* skip the 'addsize' at the end */
}
case 's': {
size_t l;
const char *s = luaL_checklstring(L, arg, &l);
if (!strchr(form, '.') && l >= 100) {
/* no precision and string is too long to be formatted;
keep original string */
lua_pushvalue(L, arg);
luaL_addvalue(&b);
continue; /* skip the `addsize' at the end */
}
else {
sprintf(buff, form, s);
break;
}
}
default: { /* also treat cases `pnLlh' */
return luaL_error(L, "invalid option " LUA_QL("%%%c") " to "
LUA_QL("format"), *(strfrmt - 1));
}
}
luaL_addlstring(&b, buff, strlen(buff));
}
}
luaL_pushresult(&b);
return 1;
}
static const luaL_Reg strlib[] = {
{"byte", str_byte},
{"char", str_char},
{"dump", str_dump},
{"find", str_find},
{"format", str_format},
{"gfind", gfind_nodef},
{"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},
{NULL, NULL}
};
static void createmetatable (lua_State *L) {
lua_createtable(L, 0, 1); /* create metatable for strings */
lua_pushliteral(L, ""); /* dummy string */
lua_pushvalue(L, -2);
lua_setmetatable(L, -2); /* set string metatable */
lua_pop(L, 1); /* pop dummy string */
lua_pushvalue(L, -2); /* string library... */
lua_setfield(L, -2, "__index"); /* ...is the __index metamethod */
lua_pop(L, 1); /* pop metatable */
}
/*
** Open string library
*/
LUALIB_API int luaopen_string (lua_State *L) {
luaL_register(L, LUA_STRLIBNAME, strlib);
#if defined(LUA_COMPAT_GFIND)
lua_getfield(L, -1, "gmatch");
lua_setfield(L, -2, "gfind");
#endif
createmetatable(L);
return 1;
}

588
src/ltable.c Normal file
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@ -0,0 +1,588 @@
/*
** $Id: ltable.c,v 2.32.1.2 2007/12/28 15:32:23 roberto Exp $
** Lua tables (hash)
** See Copyright Notice in lua.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 at
** least half the slots between 0 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 <string.h>
#define ltable_c
#define LUA_CORE
#include "lua.h"
#include "ldebug.h"
#include "ldo.h"
#include "lgc.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
#include "ltable.h"
/*
** max size of array part is 2^MAXBITS
*/
#if LUAI_BITSINT > 26
#define MAXBITS 26
#else
#define MAXBITS (LUAI_BITSINT-2)
#endif
#define MAXASIZE (1 << MAXBITS)
#define hashpow2(t,n) (gnode(t, lmod((n), sizenode(t))))
#define hashstr(t,str) hashpow2(t, (str)->tsv.hash)
#define hashboolean(t,p) hashpow2(t, p)
/*
** 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, IntPoint(p))
/*
** number of ints inside a lua_Number
*/
#define numints cast_int(sizeof(lua_Number)/sizeof(int))
#define dummynode (&dummynode_)
static const Node dummynode_ = {
{{NULL}, LUA_TNIL}, /* value */
{{{NULL}, LUA_TNIL, NULL}} /* key */
};
/*
** hash for lua_Numbers
*/
static Node *hashnum (const Table *t, lua_Number n) {
unsigned int a[numints];
int i;
if (luai_numeq(n, 0)) /* avoid problems with -0 */
return gnode(t, 0);
memcpy(a, &n, sizeof(a));
for (i = 1; i < numints; i++) a[0] += a[i];
return hashmod(t, a[0]);
}
/*
** returns the `main' position of an element in a table (that is, the index
** of its hash value)
*/
static Node *mainposition (const Table *t, const TValue *key) {
switch (ttype(key)) {
case LUA_TNUMBER:
return hashnum(t, nvalue(key));
case LUA_TSTRING:
return hashstr(t, rawtsvalue(key));
case LUA_TBOOLEAN:
return hashboolean(t, bvalue(key));
case LUA_TLIGHTUSERDATA:
return hashpointer(t, pvalue(key));
default:
return hashpointer(t, gcvalue(key));
}
}
/*
** returns the index for `key' if `key' is an appropriate key to live in
** the array part of the table, -1 otherwise.
*/
static int arrayindex (const TValue *key) {
if (ttisnumber(key)) {
lua_Number n = nvalue(key);
int k;
lua_number2int(k, n);
if (luai_numeq(cast_num(k), n))
return k;
}
return -1; /* `key' did not match some condition */
}
/*
** 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 signalled by -1.
*/
static int findindex (lua_State *L, Table *t, StkId key) {
int i;
if (ttisnil(key)) return -1; /* first iteration */
i = arrayindex(key);
if (0 < i && i <= t->sizearray) /* is `key' inside array part? */
return i-1; /* yes; that's the index (corrected to C) */
else {
Node *n = mainposition(t, key);
do { /* check whether `key' is somewhere in the chain */
/* key may be dead already, but it is ok to use it in `next' */
if (luaO_rawequalObj(key2tval(n), key) ||
(ttype(gkey(n)) == LUA_TDEADKEY && iscollectable(key) &&
gcvalue(gkey(n)) == gcvalue(key))) {
i = cast_int(n - gnode(t, 0)); /* key index in hash table */
/* hash elements are numbered after array ones */
return i + t->sizearray;
}
else n = gnext(n);
} while (n);
luaG_runerror(L, "invalid key to " LUA_QL("next")); /* key not found */
return 0; /* to avoid warnings */
}
}
int luaH_next (lua_State *L, Table *t, StkId key) {
int i = findindex(L, t, key); /* find original element */
for (i++; i < t->sizearray; i++) { /* try first array part */
if (!ttisnil(&t->array[i])) { /* a non-nil value? */
setnvalue(key, cast_num(i+1));
setobj2s(L, key+1, &t->array[i]);
return 1;
}
}
for (i -= t->sizearray; i < sizenode(t); i++) { /* then hash part */
if (!ttisnil(gval(gnode(t, i)))) { /* a non-nil value? */
setobj2s(L, key, key2tval(gnode(t, i)));
setobj2s(L, key+1, gval(gnode(t, i)));
return 1;
}
}
return 0; /* no more elements */
}
/*
** {=============================================================
** Rehash
** ==============================================================
*/
static int computesizes (int nums[], int *narray) {
int i;
int twotoi; /* 2^i */
int a = 0; /* number of elements smaller than 2^i */
int na = 0; /* number of elements to go to array part */
int n = 0; /* optimal size for array part */
for (i = 0, twotoi = 1; twotoi/2 < *narray; i++, twotoi *= 2) {
if (nums[i] > 0) {
a += nums[i];
if (a > twotoi/2) { /* more than half elements present? */
n = twotoi; /* optimal size (till now) */
na = a; /* all elements smaller than n will go to array part */
}
}
if (a == *narray) break; /* all elements already counted */
}
*narray = n;
lua_assert(*narray/2 <= na && na <= *narray);
return na;
}
static int countint (const TValue *key, int *nums) {
int k = arrayindex(key);
if (0 < k && k <= MAXASIZE) { /* is `key' an appropriate array index? */
nums[ceillog2(k)]++; /* count as such */
return 1;
}
else
return 0;
}
static int numusearray (const Table *t, int *nums) {
int lg;
int ttlg; /* 2^lg */
int ause = 0; /* summation of `nums' */
int i = 1; /* count to traverse all array keys */
for (lg=0, ttlg=1; lg<=MAXBITS; lg++, ttlg*=2) { /* for each slice */
int lc = 0; /* counter */
int lim = ttlg;
if (lim > t->sizearray) {
lim = t->sizearray; /* 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 (!ttisnil(&t->array[i-1]))
lc++;
}
nums[lg] += lc;
ause += lc;
}
return ause;
}
static int numusehash (const Table *t, int *nums, int *pnasize) {
int totaluse = 0; /* total number of elements */
int ause = 0; /* summation of `nums' */
int i = sizenode(t);
while (i--) {
Node *n = &t->node[i];
if (!ttisnil(gval(n))) {
ause += countint(key2tval(n), nums);
totaluse++;
}
}
*pnasize += ause;
return totaluse;
}
static void setarrayvector (lua_State *L, Table *t, int size) {
int i;
luaM_reallocvector(L, t->array, t->sizearray, size, TValue);
for (i=t->sizearray; i<size; i++)
setnilvalue(&t->array[i]);
t->sizearray = size;
}
static void setnodevector (lua_State *L, Table *t, int size) {
int lsize;
if (size == 0) { /* no elements to hash part? */
t->node = cast(Node *, dummynode); /* use common `dummynode' */
lsize = 0;
}
else {
int i;
lsize = ceillog2(size);
if (lsize > MAXBITS)
luaG_runerror(L, "table overflow");
size = twoto(lsize);
t->node = luaM_newvector(L, size, Node);
for (i=0; i<size; i++) {
Node *n = gnode(t, i);
gnext(n) = NULL;
setnilvalue(gkey(n));
setnilvalue(gval(n));
}
}
t->lsizenode = cast_byte(lsize);
t->lastfree = gnode(t, size); /* all positions are free */
}
static void resize (lua_State *L, Table *t, int nasize, int nhsize) {
int i;
int oldasize = t->sizearray;
int oldhsize = t->lsizenode;
Node *nold = t->node; /* save old hash ... */
if (nasize > oldasize) /* array part must grow? */
setarrayvector(L, t, nasize);
/* create new hash part with appropriate size */
setnodevector(L, t, nhsize);
if (nasize < oldasize) { /* array part must shrink? */
t->sizearray = nasize;
/* re-insert elements from vanishing slice */
for (i=nasize; i<oldasize; i++) {
if (!ttisnil(&t->array[i]))
setobjt2t(L, luaH_setnum(L, t, i+1), &t->array[i]);
}
/* shrink array */
luaM_reallocvector(L, t->array, oldasize, nasize, TValue);
}
/* re-insert elements from hash part */
for (i = twoto(oldhsize) - 1; i >= 0; i--) {
Node *old = nold+i;
if (!ttisnil(gval(old)))
setobjt2t(L, luaH_set(L, t, key2tval(old)), gval(old));
}
if (nold != dummynode)
luaM_freearray(L, nold, twoto(oldhsize), Node); /* free old array */
}
void luaH_resizearray (lua_State *L, Table *t, int nasize) {
int nsize = (t->node == dummynode) ? 0 : sizenode(t);
resize(L, t, nasize, nsize);
}
static void rehash (lua_State *L, Table *t, const TValue *ek) {
int nasize, na;
int nums[MAXBITS+1]; /* nums[i] = number of keys between 2^(i-1) and 2^i */
int i;
int totaluse;
for (i=0; i<=MAXBITS; i++) nums[i] = 0; /* reset counts */
nasize = numusearray(t, nums); /* count keys in array part */
totaluse = nasize; /* all those keys are integer keys */
totaluse += numusehash(t, nums, &nasize); /* count keys in hash part */
/* count extra key */
nasize += countint(ek, nums);
totaluse++;
/* compute new size for array part */
na = computesizes(nums, &nasize);
/* resize the table to new computed sizes */
resize(L, t, nasize, totaluse - na);
}
/*
** }=============================================================
*/
Table *luaH_new (lua_State *L, int narray, int nhash) {
Table *t = luaM_new(L, Table);
luaC_link(L, obj2gco(t), LUA_TTABLE);
t->metatable = NULL;
t->flags = cast_byte(~0);
/* temporary values (kept only if some malloc fails) */
t->array = NULL;
t->sizearray = 0;
t->lsizenode = 0;
t->node = cast(Node *, dummynode);
setarrayvector(L, t, narray);
setnodevector(L, t, nhash);
return t;
}
void luaH_free (lua_State *L, Table *t) {
if (t->node != dummynode)
luaM_freearray(L, t->node, sizenode(t), Node);
luaM_freearray(L, t->array, t->sizearray, TValue);
luaM_free(L, t);
}
static Node *getfreepos (Table *t) {
while (t->lastfree-- > t->node) {
if (ttisnil(gkey(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.
*/
static TValue *newkey (lua_State *L, Table *t, const TValue *key) {
Node *mp = mainposition(t, key);
if (!ttisnil(gval(mp)) || mp == dummynode) {
Node *othern;
Node *n = getfreepos(t); /* get a free place */
if (n == NULL) { /* cannot find a free place? */
rehash(L, t, key); /* grow table */
return luaH_set(L, t, key); /* re-insert key into grown table */
}
lua_assert(n != dummynode);
othern = mainposition(t, key2tval(mp));
if (othern != mp) { /* is colliding node out of its main position? */
/* yes; move colliding node into free position */
while (gnext(othern) != mp) othern = gnext(othern); /* find previous */
gnext(othern) = n; /* redo the chain with `n' in place of `mp' */
*n = *mp; /* copy colliding node into free pos. (mp->next also goes) */
gnext(mp) = NULL; /* now `mp' is free */
setnilvalue(gval(mp));
}
else { /* colliding node is in its own main position */
/* new node will go into free position */
gnext(n) = gnext(mp); /* chain new position */
gnext(mp) = n;
mp = n;
}
}
gkey(mp)->value = key->value; gkey(mp)->tt = key->tt;
luaC_barriert(L, t, key);
lua_assert(ttisnil(gval(mp)));
return gval(mp);
}
/*
** search function for integers
*/
const TValue *luaH_getnum (Table *t, int key) {
/* (1 <= key && key <= t->sizearray) */
if (cast(unsigned int, key-1) < cast(unsigned int, t->sizearray))
return &t->array[key-1];
else {
lua_Number nk = cast_num(key);
Node *n = hashnum(t, nk);
do { /* check whether `key' is somewhere in the chain */
if (ttisnumber(gkey(n)) && luai_numeq(nvalue(gkey(n)), nk))
return gval(n); /* that's it */
else n = gnext(n);
} while (n);
return luaO_nilobject;
}
}
/*
** search function for strings
*/
const TValue *luaH_getstr (Table *t, TString *key) {
Node *n = hashstr(t, key);
do { /* check whether `key' is somewhere in the chain */
if (ttisstring(gkey(n)) && rawtsvalue(gkey(n)) == key)
return gval(n); /* that's it */
else n = gnext(n);
} while (n);
return luaO_nilobject;
}
/*
** main search function
*/
const TValue *luaH_get (Table *t, const TValue *key) {
switch (ttype(key)) {
case LUA_TNIL: return luaO_nilobject;
case LUA_TSTRING: return luaH_getstr(t, rawtsvalue(key));
case LUA_TNUMBER: {
int k;
lua_Number n = nvalue(key);
lua_number2int(k, n);
if (luai_numeq(cast_num(k), nvalue(key))) /* index is int? */
return luaH_getnum(t, k); /* use specialized version */
/* else go through */
}
default: {
Node *n = mainposition(t, key);
do { /* check whether `key' is somewhere in the chain */
if (luaO_rawequalObj(key2tval(n), key))
return gval(n); /* that's it */
else n = gnext(n);
} while (n);
return luaO_nilobject;
}
}
}
TValue *luaH_set (lua_State *L, Table *t, const TValue *key) {
const TValue *p = luaH_get(t, key);
t->flags = 0;
if (p != luaO_nilobject)
return cast(TValue *, p);
else {
if (ttisnil(key)) luaG_runerror(L, "table index is nil");
else if (ttisnumber(key) && luai_numisnan(nvalue(key)))
luaG_runerror(L, "table index is NaN");
return newkey(L, t, key);
}
}
TValue *luaH_setnum (lua_State *L, Table *t, int key) {
const TValue *p = luaH_getnum(t, key);
if (p != luaO_nilobject)
return cast(TValue *, p);
else {
TValue k;
setnvalue(&k, cast_num(key));
return newkey(L, t, &k);
}
}
TValue *luaH_setstr (lua_State *L, Table *t, TString *key) {
const TValue *p = luaH_getstr(t, key);
if (p != luaO_nilobject)
return cast(TValue *, p);
else {
TValue k;
setsvalue(L, &k, key);
return newkey(L, t, &k);
}
}
static int unbound_search (Table *t, unsigned int j) {
unsigned int i = j; /* i is zero or a present index */
j++;
/* find `i' and `j' such that i is present and j is not */
while (!ttisnil(luaH_getnum(t, j))) {
i = j;
j *= 2;
if (j > cast(unsigned int, MAX_INT)) { /* overflow? */
/* table was built with bad purposes: resort to linear search */
i = 1;
while (!ttisnil(luaH_getnum(t, i))) i++;
return i - 1;
}
}
/* now do a binary search between them */
while (j - i > 1) {
unsigned int m = (i+j)/2;
if (ttisnil(luaH_getnum(t, m))) 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 non-nil and t[i+1] is nil (and 0 if t[1] is nil).
*/
int luaH_getn (Table *t) {
unsigned int j = t->sizearray;
if (j > 0 && ttisnil(&t->array[j - 1])) {
/* there is a boundary in the array part: (binary) search for it */
unsigned int i = 0;
while (j - i > 1) {
unsigned int m = (i+j)/2;
if (ttisnil(&t->array[m - 1])) j = m;
else i = m;
}
return i;
}
/* else must find a boundary in hash part */
else if (t->node == dummynode) /* hash part is empty? */
return j; /* that is easy... */
else return unbound_search(t, j);
}
#if defined(LUA_DEBUG)
Node *luaH_mainposition (const Table *t, const TValue *key) {
return mainposition(t, key);
}
int luaH_isdummy (Node *n) { return n == dummynode; }
#endif

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/*
** $Id: ltable.h,v 2.10.1.1 2007/12/27 13:02:25 roberto Exp $
** Lua tables (hash)
** See Copyright Notice in lua.h
*/
#ifndef ltable_h
#define ltable_h
#include "lobject.h"
#define gnode(t,i) (&(t)->node[i])
#define gkey(n) (&(n)->i_key.nk)
#define gval(n) (&(n)->i_val)
#define gnext(n) ((n)->i_key.nk.next)
#define key2tval(n) (&(n)->i_key.tvk)
LUAI_FUNC const TValue *luaH_getnum (Table *t, int key);
LUAI_FUNC TValue *luaH_setnum (lua_State *L, Table *t, int key);
LUAI_FUNC const TValue *luaH_getstr (Table *t, TString *key);
LUAI_FUNC TValue *luaH_setstr (lua_State *L, Table *t, TString *key);
LUAI_FUNC const TValue *luaH_get (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, int narray, int lnhash);
LUAI_FUNC void luaH_resizearray (lua_State *L, Table *t, 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 int luaH_getn (Table *t);
#if defined(LUA_DEBUG)
LUAI_FUNC Node *luaH_mainposition (const Table *t, const TValue *key);
LUAI_FUNC int luaH_isdummy (Node *n);
#endif
#endif

287
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/*
** $Id: ltablib.c,v 1.38.1.3 2008/02/14 16:46:58 roberto Exp $
** Library for Table Manipulation
** See Copyright Notice in lua.h
*/
#include <stddef.h>
#define ltablib_c
#define LUA_LIB
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#define aux_getn(L,n) (luaL_checktype(L, n, LUA_TTABLE), luaL_getn(L, n))
static int foreachi (lua_State *L) {
int i;
int n = aux_getn(L, 1);
luaL_checktype(L, 2, LUA_TFUNCTION);
for (i=1; i <= n; i++) {
lua_pushvalue(L, 2); /* function */
lua_pushinteger(L, i); /* 1st argument */
lua_rawgeti(L, 1, i); /* 2nd argument */
lua_call(L, 2, 1);
if (!lua_isnil(L, -1))
return 1;
lua_pop(L, 1); /* remove nil result */
}
return 0;
}
static int foreach (lua_State *L) {
luaL_checktype(L, 1, LUA_TTABLE);
luaL_checktype(L, 2, LUA_TFUNCTION);
lua_pushnil(L); /* first key */
while (lua_next(L, 1)) {
lua_pushvalue(L, 2); /* function */
lua_pushvalue(L, -3); /* key */
lua_pushvalue(L, -3); /* value */
lua_call(L, 2, 1);
if (!lua_isnil(L, -1))
return 1;
lua_pop(L, 2); /* remove value and result */
}
return 0;
}
static int maxn (lua_State *L) {
lua_Number max = 0;
luaL_checktype(L, 1, LUA_TTABLE);
lua_pushnil(L); /* first key */
while (lua_next(L, 1)) {
lua_pop(L, 1); /* remove value */
if (lua_type(L, -1) == LUA_TNUMBER) {
lua_Number v = lua_tonumber(L, -1);
if (v > max) max = v;
}
}
lua_pushnumber(L, max);
return 1;
}
static int getn (lua_State *L) {
lua_pushinteger(L, aux_getn(L, 1));
return 1;
}
static int setn (lua_State *L) {
luaL_checktype(L, 1, LUA_TTABLE);
#ifndef luaL_setn
luaL_setn(L, 1, luaL_checkint(L, 2));
#else
luaL_error(L, LUA_QL("setn") " is obsolete");
#endif
lua_pushvalue(L, 1);
return 1;
}
static int tinsert (lua_State *L) {
int e = aux_getn(L, 1) + 1; /* first empty element */
int 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: {
int i;
pos = luaL_checkint(L, 2); /* 2nd argument is the position */
if (pos > e) e = pos; /* `grow' array if necessary */
for (i = e; i > pos; i--) { /* move up elements */
lua_rawgeti(L, 1, i-1);
lua_rawseti(L, 1, i); /* t[i] = t[i-1] */
}
break;
}
default: {
return luaL_error(L, "wrong number of arguments to " LUA_QL("insert"));
}
}
luaL_setn(L, 1, e); /* new size */
lua_rawseti(L, 1, pos); /* t[pos] = v */
return 0;
}
static int tremove (lua_State *L) {
int e = aux_getn(L, 1);
int pos = luaL_optint(L, 2, e);
if (!(1 <= pos && pos <= e)) /* position is outside bounds? */
return 0; /* nothing to remove */
luaL_setn(L, 1, e - 1); /* t.n = n-1 */
lua_rawgeti(L, 1, pos); /* result = t[pos] */
for ( ;pos<e; pos++) {
lua_rawgeti(L, 1, pos+1);
lua_rawseti(L, 1, pos); /* t[pos] = t[pos+1] */
}
lua_pushnil(L);
lua_rawseti(L, 1, e); /* t[e] = nil */
return 1;
}
static void addfield (lua_State *L, luaL_Buffer *b, int i) {
lua_rawgeti(L, 1, i);
if (!lua_isstring(L, -1))
luaL_error(L, "invalid value (%s) at index %d in table for "
LUA_QL("concat"), luaL_typename(L, -1), i);
luaL_addvalue(b);
}
static int tconcat (lua_State *L) {
luaL_Buffer b;
size_t lsep;
int i, last;
const char *sep = luaL_optlstring(L, 2, "", &lsep);
luaL_checktype(L, 1, LUA_TTABLE);
i = luaL_optint(L, 3, 1);
last = luaL_opt(L, luaL_checkint, 4, luaL_getn(L, 1));
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;
}
/*
** {======================================================
** Quicksort
** (based on `Algorithms in MODULA-3', Robert Sedgewick;
** Addison-Wesley, 1993.)
*/
static void set2 (lua_State *L, int i, int j) {
lua_rawseti(L, 1, i);
lua_rawseti(L, 1, j);
}
static int sort_comp (lua_State *L, int a, int b) {
if (!lua_isnil(L, 2)) { /* function? */
int res;
lua_pushvalue(L, 2);
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);
res = lua_toboolean(L, -1);
lua_pop(L, 1);
return res;
}
else /* a < b? */
return lua_lessthan(L, a, b);
}
static void auxsort (lua_State *L, int l, int u) {
while (l < u) { /* for tail recursion */
int i, j;
/* sort elements a[l], a[(l+u)/2] and a[u] */
lua_rawgeti(L, 1, l);
lua_rawgeti(L, 1, u);
if (sort_comp(L, -1, -2)) /* a[u] < a[l]? */
set2(L, l, u); /* swap a[l] - a[u] */
else
lua_pop(L, 2);
if (u-l == 1) break; /* only 2 elements */
i = (l+u)/2;
lua_rawgeti(L, 1, i);
lua_rawgeti(L, 1, l);
if (sort_comp(L, -2, -1)) /* a[i]<a[l]? */
set2(L, i, l);
else {
lua_pop(L, 1); /* remove a[l] */
lua_rawgeti(L, 1, u);
if (sort_comp(L, -1, -2)) /* a[u]<a[i]? */
set2(L, i, u);
else
lua_pop(L, 2);
}
if (u-l == 2) break; /* only 3 elements */
lua_rawgeti(L, 1, i); /* Pivot */
lua_pushvalue(L, -1);
lua_rawgeti(L, 1, u-1);
set2(L, i, u-1);
/* a[l] <= P == a[u-1] <= a[u], only need to sort from l+1 to u-2 */
i = l; j = u-1;
for (;;) { /* invariant: a[l..i] <= P <= a[j..u] */
/* repeat ++i until a[i] >= P */
while (lua_rawgeti(L, 1, ++i), sort_comp(L, -1, -2)) {
if (i>u) luaL_error(L, "invalid order function for sorting");
lua_pop(L, 1); /* remove a[i] */
}
/* repeat --j until a[j] <= P */
while (lua_rawgeti(L, 1, --j), sort_comp(L, -3, -1)) {
if (j<l) luaL_error(L, "invalid order function for sorting");
lua_pop(L, 1); /* remove a[j] */
}
if (j<i) {
lua_pop(L, 3); /* pop pivot, a[i], a[j] */
break;
}
set2(L, i, j);
}
lua_rawgeti(L, 1, u-1);
lua_rawgeti(L, 1, i);
set2(L, u-1, i); /* swap pivot (a[u-1]) with a[i] */
/* a[l..i-1] <= a[i] == P <= a[i+1..u] */
/* adjust so that smaller half is in [j..i] and larger one in [l..u] */
if (i-l < u-i) {
j=l; i=i-1; l=i+2;
}
else {
j=i+1; i=u; u=j-2;
}
auxsort(L, j, i); /* call recursively the smaller one */
} /* repeat the routine for the larger one */
}
static int sort (lua_State *L) {
int n = aux_getn(L, 1);
luaL_checkstack(L, 40, ""); /* assume array is smaller than 2^40 */
if (!lua_isnoneornil(L, 2)) /* is there a 2nd argument? */
luaL_checktype(L, 2, LUA_TFUNCTION);
lua_settop(L, 2); /* make sure there is two arguments */
auxsort(L, 1, n);
return 0;
}
/* }====================================================== */
static const luaL_Reg tab_funcs[] = {
{"concat", tconcat},
{"foreach", foreach},
{"foreachi", foreachi},
{"getn", getn},
{"maxn", maxn},
{"insert", tinsert},
{"remove", tremove},
{"setn", setn},
{"sort", sort},
{NULL, NULL}
};
LUALIB_API int luaopen_table (lua_State *L) {
luaL_register(L, LUA_TABLIBNAME, tab_funcs);
return 1;
}

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/*
** $Id: ltm.c,v 2.8.1.1 2007/12/27 13:02:25 roberto Exp $
** Tag methods
** See Copyright Notice in lua.h
*/
#include <string.h>
#define ltm_c
#define LUA_CORE
#include "lua.h"
#include "lobject.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "ltm.h"
const char *const luaT_typenames[] = {
"nil", "boolean", "userdata", "number",
"string", "table", "function", "userdata", "thread",
"proto", "upval"
};
void luaT_init (lua_State *L) {
static const char *const luaT_eventname[] = { /* ORDER TM */
"__index", "__newindex",
"__gc", "__mode", "__eq",
"__add", "__sub", "__mul", "__div", "__mod",
"__pow", "__unm", "__len", "__lt", "__le",
"__concat", "__call"
};
int i;
for (i=0; i<TM_N; i++) {
G(L)->tmname[i] = luaS_new(L, luaT_eventname[i]);
luaS_fix(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_getstr(events, ename);
lua_assert(event <= TM_EQ);
if (ttisnil(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_getstr(mt, G(L)->tmname[event]) : luaO_nilobject);
}

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/*
** $Id: ltm.h,v 2.6.1.1 2007/12/27 13:02:25 roberto Exp $
** Tag methods
** See Copyright Notice in lua.h
*/
#ifndef ltm_h
#define ltm_h
#include "lobject.h"
/*
* WARNING: if you change the order of this enumeration,
* grep "ORDER TM"
*/
typedef enum {
TM_INDEX,
TM_NEWINDEX,
TM_GC,
TM_MODE,
TM_EQ, /* last tag method with `fast' access */
TM_ADD,
TM_SUB,
TM_MUL,
TM_DIV,
TM_MOD,
TM_POW,
TM_UNM,
TM_LEN,
TM_LT,
TM_LE,
TM_CONCAT,
TM_CALL,
TM_N /* number of elements in the enum */
} TMS;
#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)
LUAI_DATA const char *const luaT_typenames[];
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);
#endif

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/*
** $Id: lua.c,v 1.160.1.2 2007/12/28 15:32:23 roberto Exp $
** Lua stand-alone interpreter
** See Copyright Notice in lua.h
*/
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define lua_c
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
static lua_State *globalL = NULL;
static const char *progname = LUA_PROGNAME;
static void lstop (lua_State *L, lua_Debug *ar) {
(void)ar; /* unused arg. */
lua_sethook(L, NULL, 0, 0);
luaL_error(L, "interrupted!");
}
static void laction (int i) {
signal(i, SIG_DFL); /* if another SIGINT happens before lstop,
terminate process (default action) */
lua_sethook(globalL, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
}
static void print_usage (void) {
fprintf(stderr,
"usage: %s [options] [script [args]].\n"
"Available options are:\n"
" -e stat execute string " LUA_QL("stat") "\n"
" -l name require library " LUA_QL("name") "\n"
" -i enter interactive mode after executing " LUA_QL("script") "\n"
" -v show version information\n"
" -- stop handling options\n"
" - execute stdin and stop handling options\n"
,
progname);
fflush(stderr);
}
static void l_message (const char *pname, const char *msg) {
if (pname) fprintf(stderr, "%s: ", pname);
fprintf(stderr, "%s\n", msg);
fflush(stderr);
}
static int report (lua_State *L, int status) {
if (status && !lua_isnil(L, -1)) {
const char *msg = lua_tostring(L, -1);
if (msg == NULL) msg = "(error object is not a string)";
l_message(progname, msg);
lua_pop(L, 1);
}
return status;
}
static int traceback (lua_State *L) {
if (!lua_isstring(L, 1)) /* 'message' not a string? */
return 1; /* keep it intact */
lua_getfield(L, LUA_GLOBALSINDEX, "debug");
if (!lua_istable(L, -1)) {
lua_pop(L, 1);
return 1;
}
lua_getfield(L, -1, "traceback");
if (!lua_isfunction(L, -1)) {
lua_pop(L, 2);
return 1;
}
lua_pushvalue(L, 1); /* pass error message */
lua_pushinteger(L, 2); /* skip this function and traceback */
lua_call(L, 2, 1); /* call debug.traceback */
return 1;
}
static int docall (lua_State *L, int narg, int clear) {
int status;
int base = lua_gettop(L) - narg; /* function index */
lua_pushcfunction(L, traceback); /* push traceback function */
lua_insert(L, base); /* put it under chunk and args */
signal(SIGINT, laction);
status = lua_pcall(L, narg, (clear ? 0 : LUA_MULTRET), base);
signal(SIGINT, SIG_DFL);
lua_remove(L, base); /* remove traceback function */
/* force a complete garbage collection in case of errors */
if (status != 0) lua_gc(L, LUA_GCCOLLECT, 0);
return status;
}
static void print_version (void) {
l_message(NULL, LUA_RELEASE " " LUA_COPYRIGHT);
}
static int getargs (lua_State *L, char **argv, int n) {
int narg;
int i;
int argc = 0;
while (argv[argc]) argc++; /* count total number of arguments */
narg = argc - (n + 1); /* number of arguments to the script */
luaL_checkstack(L, narg + 3, "too many arguments to script");
for (i=n+1; i < argc; i++)
lua_pushstring(L, argv[i]);
lua_createtable(L, narg, n + 1);
for (i=0; i < argc; i++) {
lua_pushstring(L, argv[i]);
lua_rawseti(L, -2, i - n);
}
return narg;
}
static int dofile (lua_State *L, const char *name) {
int status = luaL_loadfile(L, name) || docall(L, 0, 1);
return report(L, status);
}
static int dostring (lua_State *L, const char *s, const char *name) {
int status = luaL_loadbuffer(L, s, strlen(s), name) || docall(L, 0, 1);
return report(L, status);
}
static int dolibrary (lua_State *L, const char *name) {
lua_getglobal(L, "require");
lua_pushstring(L, name);
return report(L, docall(L, 1, 1));
}
static const char *get_prompt (lua_State *L, int firstline) {
const char *p;
lua_getfield(L, LUA_GLOBALSINDEX, firstline ? "_PROMPT" : "_PROMPT2");
p = lua_tostring(L, -1);
if (p == NULL) p = (firstline ? LUA_PROMPT : LUA_PROMPT2);
lua_pop(L, 1); /* remove global */
return p;
}
static int incomplete (lua_State *L, int status) {
if (status == LUA_ERRSYNTAX) {
size_t lmsg;
const char *msg = lua_tolstring(L, -1, &lmsg);
const char *tp = msg + lmsg - (sizeof(LUA_QL("<eof>")) - 1);
if (strstr(msg, LUA_QL("<eof>")) == tp) {
lua_pop(L, 1);
return 1;
}
}
return 0; /* else... */
}
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);
if (lua_readline(L, b, prmt) == 0)
return 0; /* no input */
l = strlen(b);
if (l > 0 && b[l-1] == '\n') /* line ends with newline? */
b[l-1] = '\0'; /* remove it */
if (firstline && b[0] == '=') /* first line starts with `=' ? */
lua_pushfstring(L, "return %s", b+1); /* change it to `return' */
else
lua_pushstring(L, b);
lua_freeline(L, b);
return 1;
}
static int loadline (lua_State *L) {
int status;
lua_settop(L, 0);
if (!pushline(L, 1))
return -1; /* no input */
for (;;) { /* repeat until gets a complete line */
status = luaL_loadbuffer(L, lua_tostring(L, 1), lua_strlen(L, 1), "=stdin");
if (!incomplete(L, status)) break; /* cannot try to add lines? */
if (!pushline(L, 0)) /* no more input? */
return -1;
lua_pushliteral(L, "\n"); /* add a new line... */
lua_insert(L, -2); /* ...between the two lines */
lua_concat(L, 3); /* join them */
}
lua_saveline(L, 1);
lua_remove(L, 1); /* remove line */
return status;
}
static void dotty (lua_State *L) {
int status;
const char *oldprogname = progname;
progname = NULL;
while ((status = loadline(L)) != -1) {
if (status == 0) status = docall(L, 0, 0);
report(L, status);
if (status == 0 && lua_gettop(L) > 0) { /* any result to print? */
lua_getglobal(L, "print");
lua_insert(L, 1);
if (lua_pcall(L, lua_gettop(L)-1, 0, 0) != 0)
l_message(progname, lua_pushfstring(L,
"error calling " LUA_QL("print") " (%s)",
lua_tostring(L, -1)));
}
}
lua_settop(L, 0); /* clear stack */
fputs("\n", stdout);
fflush(stdout);
progname = oldprogname;
}
static int handle_script (lua_State *L, char **argv, int n) {
int status;
const char *fname;
int narg = getargs(L, argv, n); /* collect arguments */
lua_setglobal(L, "arg");
fname = argv[n];
if (strcmp(fname, "-") == 0 && strcmp(argv[n-1], "--") != 0)
fname = NULL; /* stdin */
status = luaL_loadfile(L, fname);
lua_insert(L, -(narg+1));
if (status == 0)
status = docall(L, narg, 0);
else
lua_pop(L, narg);
return report(L, status);
}
/* check that argument has no extra characters at the end */
#define notail(x) {if ((x)[2] != '\0') return -1;}
static int collectargs (char **argv, int *pi, int *pv, int *pe) {
int i;
for (i = 1; argv[i] != NULL; i++) {
if (argv[i][0] != '-') /* not an option? */
return i;
switch (argv[i][1]) { /* option */
case '-':
notail(argv[i]);
return (argv[i+1] != NULL ? i+1 : 0);
case '\0':
return i;
case 'i':
notail(argv[i]);
*pi = 1; /* go through */
case 'v':
notail(argv[i]);
*pv = 1;
break;
case 'e':
*pe = 1; /* go through */
case 'l':
if (argv[i][2] == '\0') {
i++;
if (argv[i] == NULL) return -1;
}
break;
default: return -1; /* invalid option */
}
}
return 0;
}
static int runargs (lua_State *L, char **argv, int n) {
int i;
for (i = 1; i < n; i++) {
if (argv[i] == NULL) continue;
lua_assert(argv[i][0] == '-');
switch (argv[i][1]) { /* option */
case 'e': {
const char *chunk = argv[i] + 2;
if (*chunk == '\0') chunk = argv[++i];
lua_assert(chunk != NULL);
if (dostring(L, chunk, "=(command line)") != 0)
return 1;
break;
}
case 'l': {
const char *filename = argv[i] + 2;
if (*filename == '\0') filename = argv[++i];
lua_assert(filename != NULL);
if (dolibrary(L, filename))
return 1; /* stop if file fails */
break;
}
default: break;
}
}
return 0;
}
static int handle_luainit (lua_State *L) {
const char *init = getenv(LUA_INIT);
if (init == NULL) return 0; /* status OK */
else if (init[0] == '@')
return dofile(L, init+1);
else
return dostring(L, init, "=" LUA_INIT);
}
struct Smain {
int argc;
char **argv;
int status;
};
static int pmain (lua_State *L) {
struct Smain *s = (struct Smain *)lua_touserdata(L, 1);
char **argv = s->argv;
int script;
int has_i = 0, has_v = 0, has_e = 0;
globalL = L;
if (argv[0] && argv[0][0]) progname = argv[0];
lua_gc(L, LUA_GCSTOP, 0); /* stop collector during initialization */
luaL_openlibs(L); /* open libraries */
lua_gc(L, LUA_GCRESTART, 0);
s->status = handle_luainit(L);
if (s->status != 0) return 0;
script = collectargs(argv, &has_i, &has_v, &has_e);
if (script < 0) { /* invalid args? */
print_usage();
s->status = 1;
return 0;
}
if (has_v) print_version();
s->status = runargs(L, argv, (script > 0) ? script : s->argc);
if (s->status != 0) return 0;
if (script)
s->status = handle_script(L, argv, script);
if (s->status != 0) return 0;
if (has_i)
dotty(L);
else if (script == 0 && !has_e && !has_v) {
if (lua_stdin_is_tty()) {
print_version();
dotty(L);
}
else dofile(L, NULL); /* executes stdin as a file */
}
return 0;
}
int main (int argc, char **argv) {
int status;
struct Smain s;
lua_State *L = lua_open(); /* create state */
if (L == NULL) {
l_message(argv[0], "cannot create state: not enough memory");
return EXIT_FAILURE;
}
s.argc = argc;
s.argv = argv;
status = lua_cpcall(L, &pmain, &s);
report(L, status);
lua_close(L);
return (status || s.status) ? EXIT_FAILURE : EXIT_SUCCESS;
}

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/*
** $Id: lua.h,v 1.218.1.7 2012/01/13 20:36:20 roberto Exp $
** Lua - An Extensible Extension 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"
#define LUA_VERSION "Lua 5.1"
#define LUA_RELEASE "Lua 5.1.5"
#define LUA_VERSION_NUM 501
#define LUA_COPYRIGHT "Copyright (C) 1994-2012 Lua.org, PUC-Rio"
#define LUA_AUTHORS "R. Ierusalimschy, L. H. de Figueiredo & W. Celes"
/* mark for precompiled code (`<esc>Lua') */
#define LUA_SIGNATURE "\033Lua"
/* option for multiple returns in `lua_pcall' and `lua_call' */
#define LUA_MULTRET (-1)
/*
** pseudo-indices
*/
#define LUA_REGISTRYINDEX (-10000)
#define LUA_ENVIRONINDEX (-10001)
#define LUA_GLOBALSINDEX (-10002)
#define lua_upvalueindex(i) (LUA_GLOBALSINDEX-(i))
/* thread status; 0 is OK */
#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;
typedef int (*lua_CFunction) (lua_State *L);
/*
** 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);
/*
** prototype for memory-allocation functions
*/
typedef void * (*lua_Alloc) (void *ud, void *ptr, size_t osize, size_t nsize);
/*
** 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
/* minimum Lua stack available to a C function */
#define LUA_MINSTACK 20
/*
** generic extra include file
*/
#if defined(LUA_USER_H)
#include LUA_USER_H
#endif
/* type of numbers in Lua */
typedef LUA_NUMBER lua_Number;
/* type for integer functions */
typedef LUA_INTEGER lua_Integer;
/*
** 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 lua_CFunction (lua_atpanic) (lua_State *L, lua_CFunction panicf);
/*
** basic stack manipulation
*/
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_remove) (lua_State *L, int idx);
LUA_API void (lua_insert) (lua_State *L, int idx);
LUA_API void (lua_replace) (lua_State *L, int idx);
LUA_API int (lua_checkstack) (lua_State *L, int sz);
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_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 int (lua_equal) (lua_State *L, int idx1, int idx2);
LUA_API int (lua_rawequal) (lua_State *L, int idx1, int idx2);
LUA_API int (lua_lessthan) (lua_State *L, int idx1, int idx2);
LUA_API lua_Number (lua_tonumber) (lua_State *L, int idx);
LUA_API lua_Integer (lua_tointeger) (lua_State *L, int idx);
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 size_t (lua_objlen) (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);
/*
** 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 void (lua_pushlstring) (lua_State *L, const char *s, size_t l);
LUA_API void (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 void (lua_gettable) (lua_State *L, int idx);
LUA_API void (lua_getfield) (lua_State *L, int idx, const char *k);
LUA_API void (lua_rawget) (lua_State *L, int idx);
LUA_API void (lua_rawgeti) (lua_State *L, int idx, int n);
LUA_API void (lua_createtable) (lua_State *L, int narr, int nrec);
LUA_API void *(lua_newuserdata) (lua_State *L, size_t sz);
LUA_API int (lua_getmetatable) (lua_State *L, int objindex);
LUA_API void (lua_getfenv) (lua_State *L, int idx);
/*
** set functions (stack -> Lua)
*/
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_rawset) (lua_State *L, int idx);
LUA_API void (lua_rawseti) (lua_State *L, int idx, int n);
LUA_API int (lua_setmetatable) (lua_State *L, int objindex);
LUA_API int (lua_setfenv) (lua_State *L, int idx);
/*
** `load' and `call' functions (load and run Lua code)
*/
LUA_API void (lua_call) (lua_State *L, int nargs, int nresults);
LUA_API int (lua_pcall) (lua_State *L, int nargs, int nresults, int errfunc);
LUA_API int (lua_cpcall) (lua_State *L, lua_CFunction func, void *ud);
LUA_API int (lua_load) (lua_State *L, lua_Reader reader, void *dt,
const char *chunkname);
LUA_API int (lua_dump) (lua_State *L, lua_Writer writer, void *data);
/*
** coroutine functions
*/
LUA_API int (lua_yield) (lua_State *L, int nresults);
LUA_API int (lua_resume) (lua_State *L, int narg);
LUA_API int (lua_status) (lua_State *L);
/*
** 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
LUA_API int (lua_gc) (lua_State *L, int what, int data);
/*
** 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 lua_Alloc (lua_getallocf) (lua_State *L, void **ud);
LUA_API void lua_setallocf (lua_State *L, lua_Alloc f, void *ud);
/*
** ===============================================================
** some useful macros
** ===============================================================
*/
#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_strlen(L,i) lua_objlen(L, (i))
#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_pushlstring(L, "" s, (sizeof(s)/sizeof(char))-1)
#define lua_setglobal(L,s) lua_setfield(L, LUA_GLOBALSINDEX, (s))
#define lua_getglobal(L,s) lua_getfield(L, LUA_GLOBALSINDEX, (s))
#define lua_tostring(L,i) lua_tolstring(L, (i), NULL)
/*
** compatibility macros and functions
*/
#define lua_open() luaL_newstate()
#define lua_getregistry(L) lua_pushvalue(L, LUA_REGISTRYINDEX)
#define lua_getgccount(L) lua_gc(L, LUA_GCCOUNT, 0)
#define lua_Chunkreader lua_Reader
#define lua_Chunkwriter lua_Writer
/* hack */
LUA_API void lua_setlevel (lua_State *from, lua_State *to);
/*
** {======================================================================
** Debug API
** =======================================================================
*/
/*
** Event codes
*/
#define LUA_HOOKCALL 0
#define LUA_HOOKRET 1
#define LUA_HOOKLINE 2
#define LUA_HOOKCOUNT 3
#define LUA_HOOKTAILRET 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 debuger 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 int 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);
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) */
int currentline; /* (l) */
int nups; /* (u) number of upvalues */
int linedefined; /* (S) */
int lastlinedefined; /* (S) */
char short_src[LUA_IDSIZE]; /* (S) */
/* private part */
int i_ci; /* active function */
};
/* }====================================================================== */
/******************************************************************************
* Copyright (C) 1994-2012 Lua.org, PUC-Rio. All rights reserved.
*
* 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

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src/luac.c Normal file
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@ -0,0 +1,200 @@
/*
** $Id: luac.c,v 1.54 2006/06/02 17:37:11 lhf Exp $
** Lua compiler (saves bytecodes to files; also list bytecodes)
** See Copyright Notice in lua.h
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define luac_c
#define LUA_CORE
#include "lua.h"
#include "lauxlib.h"
#include "ldo.h"
#include "lfunc.h"
#include "lmem.h"
#include "lobject.h"
#include "lopcodes.h"
#include "lstring.h"
#include "lundump.h"
#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 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 " LUA_QS "\n",progname,message);
else
fprintf(stderr,"%s: %s\n",progname,message);
fprintf(stderr,
"usage: %s [options] [filenames].\n"
"Available options are:\n"
" - process stdin\n"
" -l list\n"
" -o name output to file " LUA_QL("name") " (default is \"%s\")\n"
" -p parse only\n"
" -s strip debug information\n"
" -v show version information\n"
" -- stop handling options\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) usage(LUA_QL("-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 %s\n",LUA_RELEASE,LUA_COPYRIGHT);
if (version==argc-1) exit(EXIT_SUCCESS);
}
return i;
}
#define toproto(L,i) (clvalue(L->top+(i))->l.p)
static const Proto* combine(lua_State* L, int n)
{
if (n==1)
return toproto(L,-1);
else
{
int i,pc;
Proto* f=luaF_newproto(L);
setptvalue2s(L,L->top,f); incr_top(L);
f->source=luaS_newliteral(L,"=(" PROGNAME ")");
f->maxstacksize=1;
pc=2*n+1;
f->code=luaM_newvector(L,pc,Instruction);
f->sizecode=pc;
f->p=luaM_newvector(L,n,Proto*);
f->sizep=n;
pc=0;
for (i=0; i<n; i++)
{
f->p[i]=toproto(L,i-n-1);
f->code[pc++]=CREATE_ABx(OP_CLOSURE,0,i);
f->code[pc++]=CREATE_ABC(OP_CALL,0,1,1);
}
f->code[pc++]=CREATE_ABC(OP_RETURN,0,1,0);
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);
}
struct Smain {
int argc;
char** argv;
};
static int pmain(lua_State* L)
{
struct Smain* s = (struct Smain*)lua_touserdata(L, 1);
int argc=s->argc;
char** argv=s->argv;
const Proto* f;
int i;
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)!=0) 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;
struct Smain s;
int i=doargs(argc,argv);
argc-=i; argv+=i;
if (argc<=0) usage("no input files given");
L=lua_open();
if (L==NULL) fatal("not enough memory for state");
s.argc=argc;
s.argv=argv;
if (lua_cpcall(L,pmain,&s)!=0) fatal(lua_tostring(L,-1));
lua_close(L);
return EXIT_SUCCESS;
}

763
src/luaconf.h Normal file
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@ -0,0 +1,763 @@
/*
** $Id: luaconf.h,v 1.82.1.7 2008/02/11 16:25:08 roberto Exp $
** Configuration file for Lua
** See Copyright Notice in lua.h
*/
#ifndef lconfig_h
#define lconfig_h
#include <limits.h>
#include <stddef.h>
/*
** ==================================================================
** Search for "@@" to find all configurable definitions.
** ===================================================================
*/
/*
@@ LUA_ANSI controls the use of non-ansi features.
** CHANGE it (define it) if you want Lua to avoid the use of any
** non-ansi feature or library.
*/
#if defined(__STRICT_ANSI__)
#define LUA_ANSI
#endif
#if !defined(LUA_ANSI) && defined(_WIN32)
#define LUA_WIN
#endif
#if defined(LUA_USE_LINUX)
#define LUA_USE_POSIX
#define LUA_USE_DLOPEN /* needs an extra library: -ldl */
#define LUA_USE_READLINE /* needs some extra libraries */
#endif
#if defined(LUA_USE_MACOSX)
#define LUA_USE_POSIX
#define LUA_DL_DYLD /* does not need extra library */
#endif
/*
@@ LUA_USE_POSIX includes all functionallity listed as X/Open System
@* Interfaces Extension (XSI).
** CHANGE it (define it) if your system is XSI compatible.
*/
#if defined(LUA_USE_POSIX)
#define LUA_USE_MKSTEMP
#define LUA_USE_ISATTY
#define LUA_USE_POPEN
#define LUA_USE_ULONGJMP
#endif
/*
@@ LUA_PATH and LUA_CPATH are the names of the environment variables that
@* Lua check to set its paths.
@@ LUA_INIT is the name of the environment variable that Lua
@* checks for initialization code.
** CHANGE them if you want different names.
*/
#define LUA_PATH "LUA_PATH"
#define LUA_CPATH "LUA_CPATH"
#define LUA_INIT "LUA_INIT"
/*
@@ 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.
*/
#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_PATH_DEFAULT \
".\\?.lua;" LUA_LDIR"?.lua;" LUA_LDIR"?\\init.lua;" \
LUA_CDIR"?.lua;" LUA_CDIR"?\\init.lua"
#define LUA_CPATH_DEFAULT \
".\\?.dll;" LUA_CDIR"?.dll;" LUA_CDIR"loadall.dll"
#else
#define LUA_ROOT "/usr/local/"
#define LUA_LDIR LUA_ROOT "share/lua/5.1/"
#define LUA_CDIR LUA_ROOT "lib/lua/5.1/"
#define LUA_PATH_DEFAULT \
"./?.lua;" LUA_LDIR"?.lua;" LUA_LDIR"?/init.lua;" \
LUA_CDIR"?.lua;" LUA_CDIR"?/init.lua"
#define LUA_CPATH_DEFAULT \
"./?.so;" LUA_CDIR"?.so;" LUA_CDIR"loadall.so"
#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(_WIN32)
#define LUA_DIRSEP "\\"
#else
#define LUA_DIRSEP "/"
#endif
/*
@@ LUA_PATHSEP is the character that separates templates in a path.
@@ LUA_PATH_MARK is the string that marks the substitution points in a
@* template.
@@ LUA_EXECDIR in a Windows path is replaced by the executable's
@* directory.
@@ LUA_IGMARK is a mark to ignore all before it when bulding the
@* luaopen_ function name.
** CHANGE them if for some reason your system cannot use those
** characters. (E.g., if one of those characters is a common character
** in file/directory names.) Probably you do not need to change them.
*/
#define LUA_PATHSEP ";"
#define LUA_PATH_MARK "?"
#define LUA_EXECDIR "!"
#define LUA_IGMARK "-"
/*
@@ LUA_INTEGER is the integral type used by lua_pushinteger/lua_tointeger.
** CHANGE that if ptrdiff_t is not adequate on your machine. (On most
** machines, ptrdiff_t gives a good choice between int or long.)
*/
#define LUA_INTEGER ptrdiff_t
/*
@@ LUA_API is a mark for all core API functions.
@@ LUALIB_API is a mark for all standard library 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
/*
@@ LUAI_FUNC is a mark for all extern functions that are not to be
@* exported to outside modules.
@@ LUAI_DATA is a mark for all extern (const) variables that are not to
@* be exported to outside modules.
** 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.
*/
#if defined(luaall_c)
#define LUAI_FUNC static
#define LUAI_DATA /* empty */
#elif defined(__GNUC__) && ((__GNUC__*100 + __GNUC_MINOR__) >= 302) && \
defined(__ELF__)
#define LUAI_FUNC __attribute__((visibility("hidden"))) extern
#define LUAI_DATA LUAI_FUNC
#else
#define LUAI_FUNC extern
#define LUAI_DATA extern
#endif
/*
@@ LUA_QL describes how error messages quote program elements.
** CHANGE it if you want a different appearance.
*/
#define LUA_QL(x) "'" x "'"
#define LUA_QS LUA_QL("%s")
/*
@@ 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
/*
** {==================================================================
** Stand-alone configuration
** ===================================================================
*/
#if defined(lua_c) || defined(luaall_c)
/*
@@ lua_stdin_is_tty detects whether the standard input is a 'tty' (that
@* is, whether we're running lua interactively).
** CHANGE it if you have a better definition for non-POSIX/non-Windows
** systems.
*/
#if defined(LUA_USE_ISATTY)
#include <unistd.h>
#define lua_stdin_is_tty() isatty(0)
#elif defined(LUA_WIN)
#include <io.h>
#include <stdio.h>
#define lua_stdin_is_tty() _isatty(_fileno(stdin))
#else
#define lua_stdin_is_tty() 1 /* assume stdin is a tty */
#endif
/*
@@ LUA_PROMPT is the default prompt used by stand-alone Lua.
@@ LUA_PROMPT2 is the default continuation prompt used by stand-alone Lua.
** CHANGE them if you want different prompts. (You can also change the
** prompts dynamically, assigning to globals _PROMPT/_PROMPT2.)
*/
#define LUA_PROMPT "> "
#define LUA_PROMPT2 ">> "
/*
@@ LUA_PROGNAME is the default name for the stand-alone Lua program.
** CHANGE it if your stand-alone interpreter has a different name and
** your system is not able to detect that name automatically.
*/
#define LUA_PROGNAME "lua"
/*
@@ LUA_MAXINPUT is the maximum length for an input line in the
@* stand-alone interpreter.
** CHANGE it if you need longer lines.
*/
#define LUA_MAXINPUT 512
/*
@@ 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.
** CHANGE them if you want to improve this functionality (e.g., by using
** GNU readline and history facilities).
*/
#if defined(LUA_USE_READLINE)
#include <stdio.h>
#include <readline/readline.h>
#include <readline/history.h>
#define lua_readline(L,b,p) ((void)L, ((b)=readline(p)) != NULL)
#define lua_saveline(L,idx) \
if (lua_strlen(L,idx) > 0) /* non-empty line? */ \
add_history(lua_tostring(L, idx)); /* add it to history */
#define lua_freeline(L,b) ((void)L, free(b))
#else
#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,idx) { (void)L; (void)idx; }
#define lua_freeline(L,b) { (void)L; (void)b; }
#endif
#endif
/* }================================================================== */
/*
@@ LUAI_GCPAUSE defines the default pause between garbage-collector cycles
@* as a percentage.
** CHANGE it if you want the GC to run faster or slower (higher values
** mean larger pauses which mean slower collection.) You can also change
** this value dynamically.
*/
#define LUAI_GCPAUSE 200 /* 200% (wait memory to double before next GC) */
/*
@@ LUAI_GCMUL defines the default speed of garbage collection relative to
@* memory allocation as a percentage.
** CHANGE it if you want to change the granularity of the garbage
** collection. (Higher values mean coarser collections. 0 represents
** infinity, where each step performs a full collection.) You can also
** change this value dynamically.
*/
#define LUAI_GCMUL 200 /* GC runs 'twice the speed' of memory allocation */
/*
@@ LUA_COMPAT_GETN controls compatibility with old getn behavior.
** CHANGE it (define it) if you want exact compatibility with the
** behavior of setn/getn in Lua 5.0.
*/
#undef LUA_COMPAT_GETN
/*
@@ LUA_COMPAT_LOADLIB controls compatibility about global loadlib.
** CHANGE it to undefined as soon as you do not need a global 'loadlib'
** function (the function is still available as 'package.loadlib').
*/
#undef LUA_COMPAT_LOADLIB
/*
@@ LUA_COMPAT_VARARG controls compatibility with old vararg feature.
** CHANGE it to undefined as soon as your programs use only '...' to
** access vararg parameters (instead of the old 'arg' table).
*/
#define LUA_COMPAT_VARARG
/*
@@ LUA_COMPAT_MOD controls compatibility with old math.mod function.
** CHANGE it to undefined as soon as your programs use 'math.fmod' or
** the new '%' operator instead of 'math.mod'.
*/
#define LUA_COMPAT_MOD
/*
@@ LUA_COMPAT_LSTR controls compatibility with old long string nesting
@* facility.
** CHANGE it to 2 if you want the old behaviour, or undefine it to turn
** off the advisory error when nesting [[...]].
*/
#define LUA_COMPAT_LSTR 1
/*
@@ LUA_COMPAT_GFIND controls compatibility with old 'string.gfind' name.
** CHANGE it to undefined as soon as you rename 'string.gfind' to
** 'string.gmatch'.
*/
#define LUA_COMPAT_GFIND
/*
@@ LUA_COMPAT_OPENLIB controls compatibility with old 'luaL_openlib'
@* behavior.
** CHANGE it to undefined as soon as you replace to 'luaL_register'
** your uses of 'luaL_openlib'
*/
#define LUA_COMPAT_OPENLIB
/*
@@ luai_apicheck is the assert macro used by the Lua-C API.
** CHANGE luai_apicheck if you want Lua to perform some checks in the
** parameters it gets from API calls. This may slow down the interpreter
** a bit, but may be quite useful when debugging C code that interfaces
** with Lua. A useful redefinition is to use assert.h.
*/
#if defined(LUA_USE_APICHECK)
#include <assert.h>
#define luai_apicheck(L,o) { (void)L; assert(o); }
#else
#define luai_apicheck(L,o) { (void)L; }
#endif
/*
@@ LUAI_BITSINT defines the number of bits in an int.
** CHANGE here if Lua cannot automatically detect the number of bits of
** your machine. Probably you do not need to change this.
*/
/* avoid overflows in comparison */
#if INT_MAX-20 < 32760
#define LUAI_BITSINT 16
#elif INT_MAX > 2147483640L
/* int has at least 32 bits */
#define LUAI_BITSINT 32
#else
#error "you must define LUA_BITSINT with number of bits in an integer"
#endif
/*
@@ LUAI_UINT32 is an unsigned integer with at least 32 bits.
@@ LUAI_INT32 is an signed integer with at least 32 bits.
@@ LUAI_UMEM is an unsigned integer big enough to count the total
@* memory used by Lua.
@@ LUAI_MEM is a signed integer big enough to count the total memory
@* used by Lua.
** CHANGE here if for some weird reason the default definitions are not
** good enough for your machine. (The definitions in the 'else'
** part always works, but may waste space on machines with 64-bit
** longs.) Probably you do not need to change this.
*/
#if LUAI_BITSINT >= 32
#define LUAI_UINT32 unsigned int
#define LUAI_INT32 int
#define LUAI_MAXINT32 INT_MAX
#define LUAI_UMEM size_t
#define LUAI_MEM ptrdiff_t
#else
/* 16-bit ints */
#define LUAI_UINT32 unsigned long
#define LUAI_INT32 long
#define LUAI_MAXINT32 LONG_MAX
#define LUAI_UMEM unsigned long
#define LUAI_MEM long
#endif
/*
@@ LUAI_MAXCALLS limits the number of nested calls.
** CHANGE it if you need really deep recursive calls. This limit is
** arbitrary; its only purpose is to stop infinite recursion before
** exhausting memory.
*/
#define LUAI_MAXCALLS 20000
/*
@@ LUAI_MAXCSTACK limits the number of Lua stack slots that a C function
@* can use.
** CHANGE it if you need lots of (Lua) stack space for your C
** functions. This limit is arbitrary; its only purpose is to stop C
** functions to consume unlimited stack space. (must be smaller than
** -LUA_REGISTRYINDEX)
*/
#define LUAI_MAXCSTACK 8000
/*
** {==================================================================
** CHANGE (to smaller values) the following definitions if your system
** has a small C stack. (Or you may want to change them to larger
** values if your system has a large C stack and these limits are
** too rigid for you.) Some of these constants control the size of
** stack-allocated arrays used by the compiler or the interpreter, while
** others limit the maximum number of recursive calls that the compiler
** or the interpreter can perform. Values too large may cause a C stack
** overflow for some forms of deep constructs.
** ===================================================================
*/
/*
@@ LUAI_MAXCCALLS is the maximum depth for nested C calls (short) and
@* syntactical nested non-terminals in a program.
*/
#define LUAI_MAXCCALLS 200
/*
@@ LUAI_MAXVARS is the maximum number of local variables per function
@* (must be smaller than 250).
*/
#define LUAI_MAXVARS 200
/*
@@ LUAI_MAXUPVALUES is the maximum number of upvalues per function
@* (must be smaller than 250).
*/
#define LUAI_MAXUPVALUES 60
/*
@@ LUAL_BUFFERSIZE is the buffer size used by the lauxlib buffer system.
*/
#define LUAL_BUFFERSIZE BUFSIZ
/* }================================================================== */
/*
** {==================================================================
@@ LUA_NUMBER is the type of numbers in Lua.
** CHANGE the following definitions only if you want to build Lua
** with a number type different from double. You may also need to
** change lua_number2int & lua_number2integer.
** ===================================================================
*/
#define LUA_NUMBER_DOUBLE
#define LUA_NUMBER double
/*
@@ LUAI_UACNUMBER is the result of an 'usual argument conversion'
@* over a number.
*/
#define LUAI_UACNUMBER double
/*
@@ LUA_NUMBER_SCAN is the format for reading numbers.
@@ LUA_NUMBER_FMT is the format for writing numbers.
@@ lua_number2str converts a number to a string.
@@ LUAI_MAXNUMBER2STR is maximum size of previous conversion.
@@ lua_str2number converts a string to a number.
*/
#define LUA_NUMBER_SCAN "%lf"
#define LUA_NUMBER_FMT "%.14g"
#define lua_number2str(s,n) sprintf((s), LUA_NUMBER_FMT, (n))
#define LUAI_MAXNUMBER2STR 32 /* 16 digits, sign, point, and \0 */
#define lua_str2number(s,p) strtod((s), (p))
/*
@@ The luai_num* macros define the primitive operations over numbers.
*/
#if defined(LUA_CORE)
#include <math.h>
#define luai_numadd(a,b) ((a)+(b))
#define luai_numsub(a,b) ((a)-(b))
#define luai_nummul(a,b) ((a)*(b))
#define luai_numdiv(a,b) ((a)/(b))
#define luai_nummod(a,b) ((a) - floor((a)/(b))*(b))
#define luai_numpow(a,b) (pow(a,b))
#define luai_numunm(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_numisnan(a) (!luai_numeq((a), (a)))
#endif
/*
@@ lua_number2int is a macro to convert lua_Number to int.
@@ lua_number2integer is a macro to convert lua_Number to lua_Integer.
** CHANGE them if you know a faster way to convert a lua_Number to
** int (with any rounding method and without throwing errors) in your
** system. In Pentium machines, a naive typecast from double to int
** in C is extremely slow, so any alternative is worth trying.
*/
/* On a Pentium, resort to a trick */
#if defined(LUA_NUMBER_DOUBLE) && !defined(LUA_ANSI) && !defined(__SSE2__) && \
(defined(__i386) || defined (_M_IX86) || defined(__i386__))
/* On a Microsoft compiler, use assembler */
#if defined(_MSC_VER)
#define lua_number2int(i,d) __asm fld d __asm fistp i
#define lua_number2integer(i,n) lua_number2int(i, n)
/* the next trick should work on any Pentium, but sometimes clashes
with a DirectX idiosyncrasy */
#else
union luai_Cast { double l_d; long l_l; };
#define lua_number2int(i,d) \
{ volatile union luai_Cast u; u.l_d = (d) + 6755399441055744.0; (i) = u.l_l; }
#define lua_number2integer(i,n) lua_number2int(i, n)
#endif
/* this option always works, but may be slow */
#else
#define lua_number2int(i,d) ((i)=(int)(d))
#define lua_number2integer(i,d) ((i)=(lua_Integer)(d))
#endif
/* }================================================================== */
/*
@@ LUAI_USER_ALIGNMENT_T is a type that requires maximum alignment.
** CHANGE it if your system requires alignments larger than double. (For
** instance, if your system supports long doubles and they must be
** aligned in 16-byte boundaries, then you should add long double in the
** union.) Probably you do not need to change this.
*/
#define LUAI_USER_ALIGNMENT_T union { double u; void *s; long l; }
/*
@@ LUAI_THROW/LUAI_TRY define how Lua does exception handling.
** CHANGE them if you prefer to use longjmp/setjmp even with C++
** or if want/don't to use _longjmp/_setjmp instead of regular
** longjmp/setjmp. 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(__cplusplus)
/* 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_ULONGJMP)
/* in Unix, 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
/* default 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
/*
@@ LUA_MAXCAPTURES is the maximum number of captures that a pattern
@* can do during pattern-matching.
** CHANGE it if you need more captures. This limit is arbitrary.
*/
#define LUA_MAXCAPTURES 32
/*
@@ lua_tmpnam is the function that the OS library uses to create a
@* temporary name.
@@ LUA_TMPNAMBUFSIZE is the maximum size of a name created by lua_tmpnam.
** CHANGE them if you have an alternative to tmpnam (which is considered
** insecure) or if you want the original tmpnam anyway. By default, Lua
** uses tmpnam except when POSIX is available, where it uses mkstemp.
*/
#if defined(loslib_c) || defined(luaall_c)
#if defined(LUA_USE_MKSTEMP)
#include <unistd.h>
#define LUA_TMPNAMBUFSIZE 32
#define lua_tmpnam(b,e) { \
strcpy(b, "/tmp/lua_XXXXXX"); \
e = mkstemp(b); \
if (e != -1) close(e); \
e = (e == -1); }
#else
#define LUA_TMPNAMBUFSIZE L_tmpnam
#define lua_tmpnam(b,e) { e = (tmpnam(b) == NULL); }
#endif
#endif
/*
@@ lua_popen spawns a new process connected to the current one through
@* the file streams.
** CHANGE it if you have a way to implement it in your system.
*/
#if defined(LUA_USE_POPEN)
#define lua_popen(L,c,m) ((void)L, fflush(NULL), popen(c,m))
#define lua_pclose(L,file) ((void)L, (pclose(file) != -1))
#elif defined(LUA_WIN)
#define lua_popen(L,c,m) ((void)L, _popen(c,m))
#define lua_pclose(L,file) ((void)L, (_pclose(file) != -1))
#else
#define lua_popen(L,c,m) ((void)((void)c, m), \
luaL_error(L, LUA_QL("popen") " not supported"), (FILE*)0)
#define lua_pclose(L,file) ((void)((void)L, file), 0)
#endif
/*
@@ LUA_DL_* define which dynamic-library system Lua should use.
** CHANGE here if Lua has problems choosing the appropriate
** dynamic-library system for your platform (either Windows' DLL, Mac's
** dyld, or Unix's dlopen). If your system is some kind of Unix, there
** is a good chance that it has dlopen, so LUA_DL_DLOPEN will work for
** it. To use dlopen you also need to adapt the src/Makefile (probably
** adding -ldl to the linker options), so Lua does not select it
** automatically. (When you change the makefile to add -ldl, you must
** also add -DLUA_USE_DLOPEN.)
** If you do not want any kind of dynamic library, undefine all these
** options.
** By default, _WIN32 gets LUA_DL_DLL and MAC OS X gets LUA_DL_DYLD.
*/
#if defined(LUA_USE_DLOPEN)
#define LUA_DL_DLOPEN
#endif
#if defined(LUA_WIN)
#define LUA_DL_DLL
#endif
/*
@@ LUAI_EXTRASPACE allows you to add user-specific data in a lua_State
@* (the data goes just *before* the lua_State pointer).
** CHANGE (define) this if you really need that. This value must be
** a multiple of the maximum alignment required for your machine.
*/
#define LUAI_EXTRASPACE 0
/*
@@ luai_userstate* allow user-specific actions on threads.
** CHANGE them if you defined LUAI_EXTRASPACE and need to do something
** extra when a thread is created/deleted/resumed/yielded.
*/
#define luai_userstateopen(L) ((void)L)
#define luai_userstateclose(L) ((void)L)
#define luai_userstatethread(L,L1) ((void)L)
#define luai_userstatefree(L) ((void)L)
#define luai_userstateresume(L,n) ((void)L)
#define luai_userstateyield(L,n) ((void)L)
/*
@@ LUA_INTFRMLEN is the length modifier for integer conversions
@* in 'string.format'.
@@ LUA_INTFRM_T is the integer type correspoding to the previous length
@* modifier.
** CHANGE them if your system supports long long or does not support long.
*/
#if defined(LUA_USELONGLONG)
#define LUA_INTFRMLEN "ll"
#define LUA_INTFRM_T long long
#else
#define LUA_INTFRMLEN "l"
#define LUA_INTFRM_T long
#endif
/* =================================================================== */
/*
** Local configuration. You can use this space to add your redefinitions
** without modifying the main part of the file.
*/
#endif

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/*
** $Id: lualib.h,v 1.36.1.1 2007/12/27 13:02:25 roberto Exp $
** Lua standard libraries
** See Copyright Notice in lua.h
*/
#ifndef lualib_h
#define lualib_h
#include "lua.h"
/* Key to file-handle type */
#define LUA_FILEHANDLE "FILE*"
#define LUA_COLIBNAME "coroutine"
LUALIB_API int (luaopen_base) (lua_State *L);
#define LUA_TABLIBNAME "table"
LUALIB_API int (luaopen_table) (lua_State *L);
#define LUA_IOLIBNAME "io"
LUALIB_API int (luaopen_io) (lua_State *L);
#define LUA_OSLIBNAME "os"
LUALIB_API int (luaopen_os) (lua_State *L);
#define LUA_STRLIBNAME "string"
LUALIB_API int (luaopen_string) (lua_State *L);
#define LUA_MATHLIBNAME "math"
LUALIB_API int (luaopen_math) (lua_State *L);
#define LUA_DBLIBNAME "debug"
LUALIB_API int (luaopen_debug) (lua_State *L);
#define LUA_LOADLIBNAME "package"
LUALIB_API int (luaopen_package) (lua_State *L);
/* open all previous libraries */
LUALIB_API void (luaL_openlibs) (lua_State *L);
#ifndef lua_assert
#define lua_assert(x) ((void)0)
#endif
#endif

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/*
** $Id: lundump.c,v 2.7.1.4 2008/04/04 19:51:41 roberto Exp $
** load precompiled Lua chunks
** See Copyright Notice in lua.h
*/
#include <string.h>
#define lundump_c
#define LUA_CORE
#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"
typedef struct {
lua_State* L;
ZIO* Z;
Mbuffer* b;
const char* name;
} LoadState;
#ifdef LUAC_TRUST_BINARIES
#define IF(c,s)
#define error(S,s)
#else
#define IF(c,s) if (c) error(S,s)
static void error(LoadState* S, const char* why)
{
luaO_pushfstring(S->L,"%s: %s in precompiled chunk",S->name,why);
luaD_throw(S->L,LUA_ERRSYNTAX);
}
#endif
#define LoadMem(S,b,n,size) LoadBlock(S,b,(n)*(size))
#define LoadByte(S) (lu_byte)LoadChar(S)
#define LoadVar(S,x) LoadMem(S,&x,1,sizeof(x))
#define LoadVector(S,b,n,size) LoadMem(S,b,n,size)
static void LoadBlock(LoadState* S, void* b, size_t size)
{
size_t r=luaZ_read(S->Z,b,size);
IF (r!=0, "unexpected end");
}
static int LoadChar(LoadState* S)
{
char x;
LoadVar(S,x);
return x;
}
static int LoadInt(LoadState* S)
{
int x;
LoadVar(S,x);
IF (x<0, "bad integer");
return x;
}
static lua_Number LoadNumber(LoadState* S)
{
lua_Number x;
LoadVar(S,x);
return x;
}
static TString* LoadString(LoadState* S)
{
size_t size;
LoadVar(S,size);
if (size==0)
return NULL;
else
{
char* s=luaZ_openspace(S->L,S->b,size);
LoadBlock(S,s,size);
return luaS_newlstr(S->L,s,size-1); /* remove trailing '\0' */
}
}
static void LoadCode(LoadState* S, Proto* f)
{
int n=LoadInt(S);
f->code=luaM_newvector(S->L,n,Instruction);
f->sizecode=n;
LoadVector(S,f->code,n,sizeof(Instruction));
}
static Proto* LoadFunction(LoadState* S, TString* p);
static void LoadConstants(LoadState* S, Proto* f)
{
int i,n;
n=LoadInt(S);
f->k=luaM_newvector(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=LoadChar(S);
switch (t)
{
case LUA_TNIL:
setnilvalue(o);
break;
case LUA_TBOOLEAN:
setbvalue(o,LoadChar(S)!=0);
break;
case LUA_TNUMBER:
setnvalue(o,LoadNumber(S));
break;
case LUA_TSTRING:
setsvalue2n(S->L,o,LoadString(S));
break;
default:
error(S,"bad constant");
break;
}
}
n=LoadInt(S);
f->p=luaM_newvector(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]=LoadFunction(S,f->source);
}
static void LoadDebug(LoadState* S, Proto* f)
{
int i,n;
n=LoadInt(S);
f->lineinfo=luaM_newvector(S->L,n,int);
f->sizelineinfo=n;
LoadVector(S,f->lineinfo,n,sizeof(int));
n=LoadInt(S);
f->locvars=luaM_newvector(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=LoadString(S);
f->locvars[i].startpc=LoadInt(S);
f->locvars[i].endpc=LoadInt(S);
}
n=LoadInt(S);
f->upvalues=luaM_newvector(S->L,n,TString*);
f->sizeupvalues=n;
for (i=0; i<n; i++) f->upvalues[i]=NULL;
for (i=0; i<n; i++) f->upvalues[i]=LoadString(S);
}
static Proto* LoadFunction(LoadState* S, TString* p)
{
Proto* f;
if (++S->L->nCcalls > LUAI_MAXCCALLS) error(S,"code too deep");
f=luaF_newproto(S->L);
setptvalue2s(S->L,S->L->top,f); incr_top(S->L);
f->source=LoadString(S); if (f->source==NULL) f->source=p;
f->linedefined=LoadInt(S);
f->lastlinedefined=LoadInt(S);
f->nups=LoadByte(S);
f->numparams=LoadByte(S);
f->is_vararg=LoadByte(S);
f->maxstacksize=LoadByte(S);
LoadCode(S,f);
LoadConstants(S,f);
LoadDebug(S,f);
IF (!luaG_checkcode(f), "bad code");
S->L->top--;
S->L->nCcalls--;
return f;
}
static void LoadHeader(LoadState* S)
{
char h[LUAC_HEADERSIZE];
char s[LUAC_HEADERSIZE];
luaU_header(h);
LoadBlock(S,s,LUAC_HEADERSIZE);
IF (memcmp(h,s,LUAC_HEADERSIZE)!=0, "bad header");
}
/*
** load precompiled chunk
*/
Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name)
{
LoadState S;
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;
S.b=buff;
LoadHeader(&S);
return LoadFunction(&S,luaS_newliteral(L,"=?"));
}
/*
* make header
*/
void luaU_header (char* h)
{
int x=1;
memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-1);
h+=sizeof(LUA_SIGNATURE)-1;
*h++=(char)LUAC_VERSION;
*h++=(char)LUAC_FORMAT;
*h++=(char)*(char*)&x; /* endianness */
*h++=(char)sizeof(int);
*h++=(char)sizeof(size_t);
*h++=(char)sizeof(Instruction);
*h++=(char)sizeof(lua_Number);
*h++=(char)(((lua_Number)0.5)==0); /* is lua_Number integral? */
}

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/*
** $Id: lundump.h,v 1.37.1.1 2007/12/27 13:02:25 roberto Exp $
** load precompiled Lua chunks
** See Copyright Notice in lua.h
*/
#ifndef lundump_h
#define lundump_h
#include "lobject.h"
#include "lzio.h"
/* load one chunk; from lundump.c */
LUAI_FUNC Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name);
/* make header; from lundump.c */
LUAI_FUNC void luaU_header (char* h);
/* dump one chunk; from ldump.c */
LUAI_FUNC int luaU_dump (lua_State* L, const Proto* f, lua_Writer w, void* data, int strip);
#ifdef luac_c
/* print one chunk; from print.c */
LUAI_FUNC void luaU_print (const Proto* f, int full);
#endif
/* for header of binary files -- this is Lua 5.1 */
#define LUAC_VERSION 0x51
/* for header of binary files -- this is the official format */
#define LUAC_FORMAT 0
/* size of header of binary files */
#define LUAC_HEADERSIZE 12
#endif

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/*
** $Id: lvm.c,v 2.63.1.5 2011/08/17 20:43:11 roberto Exp $
** Lua virtual machine
** See Copyright Notice in lua.h
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define lvm_c
#define LUA_CORE
#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"
/* limit for table tag-method chains (to avoid loops) */
#define MAXTAGLOOP 100
const TValue *luaV_tonumber (const TValue *obj, TValue *n) {
lua_Number num;
if (ttisnumber(obj)) return obj;
if (ttisstring(obj) && luaO_str2d(svalue(obj), &num)) {
setnvalue(n, num);
return n;
}
else
return NULL;
}
int luaV_tostring (lua_State *L, StkId obj) {
if (!ttisnumber(obj))
return 0;
else {
char s[LUAI_MAXNUMBER2STR];
lua_Number n = nvalue(obj);
lua_number2str(s, n);
setsvalue2s(L, obj, luaS_new(L, s));
return 1;
}
}
static void traceexec (lua_State *L, const Instruction *pc) {
lu_byte mask = L->hookmask;
const Instruction *oldpc = L->savedpc;
L->savedpc = pc;
if ((mask & LUA_MASKCOUNT) && L->hookcount == 0) {
resethookcount(L);
luaD_callhook(L, LUA_HOOKCOUNT, -1);
}
if (mask & LUA_MASKLINE) {
Proto *p = ci_func(L->ci)->l.p;
int npc = pcRel(pc, p);
int newline = getline(p, npc);
/* call linehook when enter a new function, when jump back (loop),
or when enter a new line */
if (npc == 0 || pc <= oldpc || newline != getline(p, pcRel(oldpc, p)))
luaD_callhook(L, LUA_HOOKLINE, newline);
}
}
static void callTMres (lua_State *L, StkId res, const TValue *f,
const TValue *p1, const TValue *p2) {
ptrdiff_t result = savestack(L, res);
setobj2s(L, L->top, f); /* push function */
setobj2s(L, L->top+1, p1); /* 1st argument */
setobj2s(L, L->top+2, p2); /* 2nd argument */
luaD_checkstack(L, 3);
L->top += 3;
luaD_call(L, L->top - 3, 1);
res = restorestack(L, result);
L->top--;
setobjs2s(L, res, L->top);
}
static void callTM (lua_State *L, const TValue *f, const TValue *p1,
const TValue *p2, const TValue *p3) {
setobj2s(L, L->top, f); /* push function */
setobj2s(L, L->top+1, p1); /* 1st argument */
setobj2s(L, L->top+2, p2); /* 2nd argument */
setobj2s(L, L->top+3, p3); /* 3th argument */
luaD_checkstack(L, 4);
L->top += 4;
luaD_call(L, L->top - 4, 0);
}
void luaV_gettable (lua_State *L, const TValue *t, TValue *key, StkId val) {
int loop;
for (loop = 0; loop < MAXTAGLOOP; loop++) {
const TValue *tm;
if (ttistable(t)) { /* `t' is a table? */
Table *h = hvalue(t);
const TValue *res = luaH_get(h, key); /* do a primitive get */
if (!ttisnil(res) || /* result is no nil? */
(tm = fasttm(L, h->metatable, TM_INDEX)) == NULL) { /* or no TM? */
setobj2s(L, val, res);
return;
}
/* else will try the tag method */
}
else if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_INDEX)))
luaG_typeerror(L, t, "index");
if (ttisfunction(tm)) {
callTMres(L, val, tm, t, key);
return;
}
t = tm; /* else repeat with `tm' */
}
luaG_runerror(L, "loop in gettable");
}
void luaV_settable (lua_State *L, const TValue *t, TValue *key, StkId val) {
int loop;
TValue temp;
for (loop = 0; loop < MAXTAGLOOP; loop++) {
const TValue *tm;
if (ttistable(t)) { /* `t' is a table? */
Table *h = hvalue(t);
TValue *oldval = luaH_set(L, h, key); /* do a primitive set */
if (!ttisnil(oldval) || /* result is no nil? */
(tm = fasttm(L, h->metatable, TM_NEWINDEX)) == NULL) { /* or no TM? */
setobj2t(L, oldval, val);
h->flags = 0;
luaC_barriert(L, h, val);
return;
}
/* else will try the tag method */
}
else if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_NEWINDEX)))
luaG_typeerror(L, t, "index");
if (ttisfunction(tm)) {
callTM(L, tm, t, key, val);
return;
}
/* else repeat with `tm' */
setobj(L, &temp, tm); /* avoid pointing inside table (may rehash) */
t = &temp;
}
luaG_runerror(L, "loop in settable");
}
static int call_binTM (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 (ttisnil(tm))
tm = luaT_gettmbyobj(L, p2, event); /* try second operand */
if (ttisnil(tm)) return 0;
callTMres(L, res, tm, p1, p2);
return 1;
}
static const TValue *get_compTM (lua_State *L, Table *mt1, Table *mt2,
TMS event) {
const TValue *tm1 = fasttm(L, mt1, event);
const TValue *tm2;
if (tm1 == NULL) return NULL; /* no metamethod */
if (mt1 == mt2) return tm1; /* same metatables => same metamethods */
tm2 = fasttm(L, mt2, event);
if (tm2 == NULL) return NULL; /* no metamethod */
if (luaO_rawequalObj(tm1, tm2)) /* same metamethods? */
return tm1;
return NULL;
}
static int call_orderTM (lua_State *L, const TValue *p1, const TValue *p2,
TMS event) {
const TValue *tm1 = luaT_gettmbyobj(L, p1, event);
const TValue *tm2;
if (ttisnil(tm1)) return -1; /* no metamethod? */
tm2 = luaT_gettmbyobj(L, p2, event);
if (!luaO_rawequalObj(tm1, tm2)) /* different metamethods? */
return -1;
callTMres(L, L->top, tm1, p1, p2);
return !l_isfalse(L->top);
}
static int l_strcmp (const TString *ls, const TString *rs) {
const char *l = getstr(ls);
size_t ll = ls->tsv.len;
const char *r = getstr(rs);
size_t lr = rs->tsv.len;
for (;;) {
int temp = strcoll(l, r);
if (temp != 0) return temp;
else { /* strings are equal up to a `\0' */
size_t len = strlen(l); /* index of first `\0' in both strings */
if (len == lr) /* r is finished? */
return (len == ll) ? 0 : 1;
else if (len == ll) /* l is finished? */
return -1; /* l is smaller than r (because r is not finished) */
/* both strings longer than `len'; go on comparing (after the `\0') */
len++;
l += len; ll -= len; r += len; lr -= len;
}
}
}
int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r) {
int res;
if (ttype(l) != ttype(r))
return luaG_ordererror(L, l, r);
else if (ttisnumber(l))
return luai_numlt(nvalue(l), nvalue(r));
else if (ttisstring(l))
return l_strcmp(rawtsvalue(l), rawtsvalue(r)) < 0;
else if ((res = call_orderTM(L, l, r, TM_LT)) != -1)
return res;
return luaG_ordererror(L, l, r);
}
static int lessequal (lua_State *L, const TValue *l, const TValue *r) {
int res;
if (ttype(l) != ttype(r))
return luaG_ordererror(L, l, r);
else if (ttisnumber(l))
return luai_numle(nvalue(l), nvalue(r));
else if (ttisstring(l))
return l_strcmp(rawtsvalue(l), rawtsvalue(r)) <= 0;
else if ((res = call_orderTM(L, l, r, TM_LE)) != -1) /* first try `le' */
return res;
else if ((res = call_orderTM(L, r, l, TM_LT)) != -1) /* else try `lt' */
return !res;
return luaG_ordererror(L, l, r);
}
int luaV_equalval (lua_State *L, const TValue *t1, const TValue *t2) {
const TValue *tm;
lua_assert(ttype(t1) == ttype(t2));
switch (ttype(t1)) {
case LUA_TNIL: return 1;
case LUA_TNUMBER: return luai_numeq(nvalue(t1), nvalue(t2));
case LUA_TBOOLEAN: return bvalue(t1) == bvalue(t2); /* true must be 1 !! */
case LUA_TLIGHTUSERDATA: return pvalue(t1) == pvalue(t2);
case LUA_TUSERDATA: {
if (uvalue(t1) == uvalue(t2)) return 1;
tm = get_compTM(L, uvalue(t1)->metatable, uvalue(t2)->metatable,
TM_EQ);
break; /* will try TM */
}
case LUA_TTABLE: {
if (hvalue(t1) == hvalue(t2)) return 1;
tm = get_compTM(L, hvalue(t1)->metatable, hvalue(t2)->metatable, TM_EQ);
break; /* will try TM */
}
default: return gcvalue(t1) == gcvalue(t2);
}
if (tm == NULL) return 0; /* no TM? */
callTMres(L, L->top, tm, t1, t2); /* call TM */
return !l_isfalse(L->top);
}
void luaV_concat (lua_State *L, int total, int last) {
do {
StkId top = L->base + last + 1;
int n = 2; /* number of elements handled in this pass (at least 2) */
if (!(ttisstring(top-2) || ttisnumber(top-2)) || !tostring(L, top-1)) {
if (!call_binTM(L, top-2, top-1, top-2, TM_CONCAT))
luaG_concaterror(L, top-2, top-1);
} else if (tsvalue(top-1)->len == 0) /* second op is empty? */
(void)tostring(L, top - 2); /* result is first op (as string) */
else {
/* at least two string values; get as many as possible */
size_t tl = tsvalue(top-1)->len;
char *buffer;
int i;
/* collect total length */
for (n = 1; n < total && tostring(L, top-n-1); n++) {
size_t l = tsvalue(top-n-1)->len;
if (l >= MAX_SIZET - tl) luaG_runerror(L, "string length overflow");
tl += l;
}
buffer = luaZ_openspace(L, &G(L)->buff, tl);
tl = 0;
for (i=n; i>0; i--) { /* concat all strings */
size_t l = tsvalue(top-i)->len;
memcpy(buffer+tl, svalue(top-i), l);
tl += l;
}
setsvalue2s(L, top-n, luaS_newlstr(L, buffer, tl));
}
total -= n-1; /* got `n' strings to create 1 new */
last -= n-1;
} while (total > 1); /* repeat until only 1 result left */
}
static void Arith (lua_State *L, StkId ra, const TValue *rb,
const TValue *rc, TMS op) {
TValue tempb, tempc;
const TValue *b, *c;
if ((b = luaV_tonumber(rb, &tempb)) != NULL &&
(c = luaV_tonumber(rc, &tempc)) != NULL) {
lua_Number nb = nvalue(b), nc = nvalue(c);
switch (op) {
case TM_ADD: setnvalue(ra, luai_numadd(nb, nc)); break;
case TM_SUB: setnvalue(ra, luai_numsub(nb, nc)); break;
case TM_MUL: setnvalue(ra, luai_nummul(nb, nc)); break;
case TM_DIV: setnvalue(ra, luai_numdiv(nb, nc)); break;
case TM_MOD: setnvalue(ra, luai_nummod(nb, nc)); break;
case TM_POW: setnvalue(ra, luai_numpow(nb, nc)); break;
case TM_UNM: setnvalue(ra, luai_numunm(nb)); break;
default: lua_assert(0); break;
}
}
else if (!call_binTM(L, rb, rc, ra, op))
luaG_aritherror(L, rb, rc);
}
/*
** some macros for common tasks in `luaV_execute'
*/
#define runtime_check(L, c) { if (!(c)) break; }
#define RA(i) (base+GETARG_A(i))
/* to be used after possible stack reallocation */
#define RB(i) check_exp(getBMode(GET_OPCODE(i)) == OpArgR, base+GETARG_B(i))
#define RC(i) check_exp(getCMode(GET_OPCODE(i)) == OpArgR, base+GETARG_C(i))
#define RKB(i) check_exp(getBMode(GET_OPCODE(i)) == OpArgK, \
ISK(GETARG_B(i)) ? k+INDEXK(GETARG_B(i)) : base+GETARG_B(i))
#define RKC(i) check_exp(getCMode(GET_OPCODE(i)) == OpArgK, \
ISK(GETARG_C(i)) ? k+INDEXK(GETARG_C(i)) : base+GETARG_C(i))
#define KBx(i) check_exp(getBMode(GET_OPCODE(i)) == OpArgK, k+GETARG_Bx(i))
#define dojump(L,pc,i) {(pc) += (i); luai_threadyield(L);}
#define Protect(x) { L->savedpc = pc; {x;}; base = L->base; }
#define arith_op(op,tm) { \
TValue *rb = RKB(i); \
TValue *rc = RKC(i); \
if (ttisnumber(rb) && ttisnumber(rc)) { \
lua_Number nb = nvalue(rb), nc = nvalue(rc); \
setnvalue(ra, op(nb, nc)); \
} \
else \
Protect(Arith(L, ra, rb, rc, tm)); \
}
void luaV_execute (lua_State *L, int nexeccalls) {
LClosure *cl;
StkId base;
TValue *k;
const Instruction *pc;
reentry: /* entry point */
lua_assert(isLua(L->ci));
pc = L->savedpc;
cl = &clvalue(L->ci->func)->l;
base = L->base;
k = cl->p->k;
/* main loop of interpreter */
for (;;) {
const Instruction i = *pc++;
StkId ra;
if ((L->hookmask & (LUA_MASKLINE | LUA_MASKCOUNT)) &&
(--L->hookcount == 0 || L->hookmask & LUA_MASKLINE)) {
traceexec(L, pc);
if (L->status == LUA_YIELD) { /* did hook yield? */
L->savedpc = pc - 1;
return;
}
base = L->base;
}
/* warning!! several calls may realloc the stack and invalidate `ra' */
ra = RA(i);
lua_assert(base == L->base && L->base == L->ci->base);
lua_assert(base <= L->top && L->top <= L->stack + L->stacksize);
lua_assert(L->top == L->ci->top || luaG_checkopenop(i));
switch (GET_OPCODE(i)) {
case OP_MOVE: {
setobjs2s(L, ra, RB(i));
continue;
}
case OP_LOADK: {
setobj2s(L, ra, KBx(i));
continue;
}
case OP_LOADBOOL: {
setbvalue(ra, GETARG_B(i));
if (GETARG_C(i)) pc++; /* skip next instruction (if C) */
continue;
}
case OP_LOADNIL: {
TValue *rb = RB(i);
do {
setnilvalue(rb--);
} while (rb >= ra);
continue;
}
case OP_GETUPVAL: {
int b = GETARG_B(i);
setobj2s(L, ra, cl->upvals[b]->v);
continue;
}
case OP_GETGLOBAL: {
TValue g;
TValue *rb = KBx(i);
sethvalue(L, &g, cl->env);
lua_assert(ttisstring(rb));
Protect(luaV_gettable(L, &g, rb, ra));
continue;
}
case OP_GETTABLE: {
Protect(luaV_gettable(L, RB(i), RKC(i), ra));
continue;
}
case OP_SETGLOBAL: {
TValue g;
sethvalue(L, &g, cl->env);
lua_assert(ttisstring(KBx(i)));
Protect(luaV_settable(L, &g, KBx(i), ra));
continue;
}
case OP_SETUPVAL: {
UpVal *uv = cl->upvals[GETARG_B(i)];
setobj(L, uv->v, ra);
luaC_barrier(L, uv, ra);
continue;
}
case OP_SETTABLE: {
Protect(luaV_settable(L, ra, RKB(i), RKC(i)));
continue;
}
case OP_NEWTABLE: {
int b = GETARG_B(i);
int c = GETARG_C(i);
sethvalue(L, ra, luaH_new(L, luaO_fb2int(b), luaO_fb2int(c)));
Protect(luaC_checkGC(L));
continue;
}
case OP_SELF: {
StkId rb = RB(i);
setobjs2s(L, ra+1, rb);
Protect(luaV_gettable(L, rb, RKC(i), ra));
continue;
}
case OP_ADD: {
arith_op(luai_numadd, TM_ADD);
continue;
}
case OP_SUB: {
arith_op(luai_numsub, TM_SUB);
continue;
}
case OP_MUL: {
arith_op(luai_nummul, TM_MUL);
continue;
}
case OP_DIV: {
arith_op(luai_numdiv, TM_DIV);
continue;
}
case OP_MOD: {
arith_op(luai_nummod, TM_MOD);
continue;
}
case OP_POW: {
arith_op(luai_numpow, TM_POW);
continue;
}
case OP_UNM: {
TValue *rb = RB(i);
if (ttisnumber(rb)) {
lua_Number nb = nvalue(rb);
setnvalue(ra, luai_numunm(nb));
}
else {
Protect(Arith(L, ra, rb, rb, TM_UNM));
}
continue;
}
case OP_NOT: {
int res = l_isfalse(RB(i)); /* next assignment may change this value */
setbvalue(ra, res);
continue;
}
case OP_LEN: {
const TValue *rb = RB(i);
switch (ttype(rb)) {
case LUA_TTABLE: {
setnvalue(ra, cast_num(luaH_getn(hvalue(rb))));
break;
}
case LUA_TSTRING: {
setnvalue(ra, cast_num(tsvalue(rb)->len));
break;
}
default: { /* try metamethod */
Protect(
if (!call_binTM(L, rb, luaO_nilobject, ra, TM_LEN))
luaG_typeerror(L, rb, "get length of");
)
}
}
continue;
}
case OP_CONCAT: {
int b = GETARG_B(i);
int c = GETARG_C(i);
Protect(luaV_concat(L, c-b+1, c); luaC_checkGC(L));
setobjs2s(L, RA(i), base+b);
continue;
}
case OP_JMP: {
dojump(L, pc, GETARG_sBx(i));
continue;
}
case OP_EQ: {
TValue *rb = RKB(i);
TValue *rc = RKC(i);
Protect(
if (equalobj(L, rb, rc) == GETARG_A(i))
dojump(L, pc, GETARG_sBx(*pc));
)
pc++;
continue;
}
case OP_LT: {
Protect(
if (luaV_lessthan(L, RKB(i), RKC(i)) == GETARG_A(i))
dojump(L, pc, GETARG_sBx(*pc));
)
pc++;
continue;
}
case OP_LE: {
Protect(
if (lessequal(L, RKB(i), RKC(i)) == GETARG_A(i))
dojump(L, pc, GETARG_sBx(*pc));
)
pc++;
continue;
}
case OP_TEST: {
if (l_isfalse(ra) != GETARG_C(i))
dojump(L, pc, GETARG_sBx(*pc));
pc++;
continue;
}
case OP_TESTSET: {
TValue *rb = RB(i);
if (l_isfalse(rb) != GETARG_C(i)) {
setobjs2s(L, ra, rb);
dojump(L, pc, GETARG_sBx(*pc));
}
pc++;
continue;
}
case OP_CALL: {
int b = GETARG_B(i);
int nresults = GETARG_C(i) - 1;
if (b != 0) L->top = ra+b; /* else previous instruction set top */
L->savedpc = pc;
switch (luaD_precall(L, ra, nresults)) {
case PCRLUA: {
nexeccalls++;
goto reentry; /* restart luaV_execute over new Lua function */
}
case PCRC: {
/* it was a C function (`precall' called it); adjust results */
if (nresults >= 0) L->top = L->ci->top;
base = L->base;
continue;
}
default: {
return; /* yield */
}
}
}
case OP_TAILCALL: {
int b = GETARG_B(i);
if (b != 0) L->top = ra+b; /* else previous instruction set top */
L->savedpc = pc;
lua_assert(GETARG_C(i) - 1 == LUA_MULTRET);
switch (luaD_precall(L, ra, LUA_MULTRET)) {
case PCRLUA: {
/* tail call: put new frame in place of previous one */
CallInfo *ci = L->ci - 1; /* previous frame */
int aux;
StkId func = ci->func;
StkId pfunc = (ci+1)->func; /* previous function index */
if (L->openupval) luaF_close(L, ci->base);
L->base = ci->base = ci->func + ((ci+1)->base - pfunc);
for (aux = 0; pfunc+aux < L->top; aux++) /* move frame down */
setobjs2s(L, func+aux, pfunc+aux);
ci->top = L->top = func+aux; /* correct top */
lua_assert(L->top == L->base + clvalue(func)->l.p->maxstacksize);
ci->savedpc = L->savedpc;
ci->tailcalls++; /* one more call lost */
L->ci--; /* remove new frame */
goto reentry;
}
case PCRC: { /* it was a C function (`precall' called it) */
base = L->base;
continue;
}
default: {
return; /* yield */
}
}
}
case OP_RETURN: {
int b = GETARG_B(i);
if (b != 0) L->top = ra+b-1;
if (L->openupval) luaF_close(L, base);
L->savedpc = pc;
b = luaD_poscall(L, ra);
if (--nexeccalls == 0) /* was previous function running `here'? */
return; /* no: return */
else { /* yes: continue its execution */
if (b) L->top = L->ci->top;
lua_assert(isLua(L->ci));
lua_assert(GET_OPCODE(*((L->ci)->savedpc - 1)) == OP_CALL);
goto reentry;
}
}
case OP_FORLOOP: {
lua_Number step = nvalue(ra+2);
lua_Number idx = luai_numadd(nvalue(ra), step); /* increment index */
lua_Number limit = nvalue(ra+1);
if (luai_numlt(0, step) ? luai_numle(idx, limit)
: luai_numle(limit, idx)) {
dojump(L, pc, GETARG_sBx(i)); /* jump back */
setnvalue(ra, idx); /* update internal index... */
setnvalue(ra+3, idx); /* ...and external index */
}
continue;
}
case OP_FORPREP: {
const TValue *init = ra;
const TValue *plimit = ra+1;
const TValue *pstep = ra+2;
L->savedpc = pc; /* next steps may throw errors */
if (!tonumber(init, ra))
luaG_runerror(L, LUA_QL("for") " initial value must be a number");
else if (!tonumber(plimit, ra+1))
luaG_runerror(L, LUA_QL("for") " limit must be a number");
else if (!tonumber(pstep, ra+2))
luaG_runerror(L, LUA_QL("for") " step must be a number");
setnvalue(ra, luai_numsub(nvalue(ra), nvalue(pstep)));
dojump(L, pc, GETARG_sBx(i));
continue;
}
case OP_TFORLOOP: {
StkId cb = ra + 3; /* call base */
setobjs2s(L, cb+2, ra+2);
setobjs2s(L, cb+1, ra+1);
setobjs2s(L, cb, ra);
L->top = cb+3; /* func. + 2 args (state and index) */
Protect(luaD_call(L, cb, GETARG_C(i)));
L->top = L->ci->top;
cb = RA(i) + 3; /* previous call may change the stack */
if (!ttisnil(cb)) { /* continue loop? */
setobjs2s(L, cb-1, cb); /* save control variable */
dojump(L, pc, GETARG_sBx(*pc)); /* jump back */
}
pc++;
continue;
}
case OP_SETLIST: {
int n = GETARG_B(i);
int c = GETARG_C(i);
int last;
Table *h;
if (n == 0) {
n = cast_int(L->top - ra) - 1;
L->top = L->ci->top;
}
if (c == 0) c = cast_int(*pc++);
runtime_check(L, ttistable(ra));
h = hvalue(ra);
last = ((c-1)*LFIELDS_PER_FLUSH) + n;
if (last > h->sizearray) /* needs more space? */
luaH_resizearray(L, h, last); /* pre-alloc it at once */
for (; n > 0; n--) {
TValue *val = ra+n;
setobj2t(L, luaH_setnum(L, h, last--), val);
luaC_barriert(L, h, val);
}
continue;
}
case OP_CLOSE: {
luaF_close(L, ra);
continue;
}
case OP_CLOSURE: {
Proto *p;
Closure *ncl;
int nup, j;
p = cl->p->p[GETARG_Bx(i)];
nup = p->nups;
ncl = luaF_newLclosure(L, nup, cl->env);
ncl->l.p = p;
for (j=0; j<nup; j++, pc++) {
if (GET_OPCODE(*pc) == OP_GETUPVAL)
ncl->l.upvals[j] = cl->upvals[GETARG_B(*pc)];
else {
lua_assert(GET_OPCODE(*pc) == OP_MOVE);
ncl->l.upvals[j] = luaF_findupval(L, base + GETARG_B(*pc));
}
}
setclvalue(L, ra, ncl);
Protect(luaC_checkGC(L));
continue;
}
case OP_VARARG: {
int b = GETARG_B(i) - 1;
int j;
CallInfo *ci = L->ci;
int n = cast_int(ci->base - ci->func) - cl->p->numparams - 1;
if (b == LUA_MULTRET) {
Protect(luaD_checkstack(L, n));
ra = RA(i); /* previous call may change the stack */
b = n;
L->top = ra + n;
}
for (j = 0; j < b; j++) {
if (j < n) {
setobjs2s(L, ra + j, ci->base - n + j);
}
else {
setnilvalue(ra + j);
}
}
continue;
}
}
}
}

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/*
** $Id: lvm.h,v 2.5.1.1 2007/12/27 13:02:25 roberto Exp $
** Lua virtual machine
** See Copyright Notice in lua.h
*/
#ifndef lvm_h
#define lvm_h
#include "ldo.h"
#include "lobject.h"
#include "ltm.h"
#define tostring(L,o) ((ttype(o) == LUA_TSTRING) || (luaV_tostring(L, o)))
#define tonumber(o,n) (ttype(o) == LUA_TNUMBER || \
(((o) = luaV_tonumber(o,n)) != NULL))
#define equalobj(L,o1,o2) \
(ttype(o1) == ttype(o2) && luaV_equalval(L, o1, o2))
LUAI_FUNC int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r);
LUAI_FUNC int luaV_equalval (lua_State *L, const TValue *t1, const TValue *t2);
LUAI_FUNC const TValue *luaV_tonumber (const TValue *obj, TValue *n);
LUAI_FUNC int luaV_tostring (lua_State *L, StkId obj);
LUAI_FUNC void luaV_gettable (lua_State *L, const TValue *t, TValue *key,
StkId val);
LUAI_FUNC void luaV_settable (lua_State *L, const TValue *t, TValue *key,
StkId val);
LUAI_FUNC void luaV_execute (lua_State *L, int nexeccalls);
LUAI_FUNC void luaV_concat (lua_State *L, int total, int last);
#endif

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/*
** $Id: lzio.c,v 1.31.1.1 2007/12/27 13:02:25 roberto Exp $
** a generic input stream interface
** See Copyright Notice in lua.h
*/
#include <string.h>
#define lzio_c
#define LUA_CORE
#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;
z->p = buff;
return char2int(*(z->p++));
}
int luaZ_lookahead (ZIO *z) {
if (z->n == 0) {
if (luaZ_fill(z) == EOZ)
return EOZ;
else {
z->n++; /* luaZ_fill removed first byte; put back it */
z->p--;
}
}
return char2int(*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 (luaZ_lookahead(z) == EOZ)
return n; /* return number of missing bytes */
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;
}
/* ------------------------------------------------------------------------ */
char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n) {
if (n > buff->buffsize) {
if (n < LUA_MINBUFFER) n = LUA_MINBUFFER;
luaZ_resizebuffer(L, buff, n);
}
return buff->buffer;
}

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/*
** $Id: lzio.h,v 1.21.1.1 2007/12/27 13:02:25 roberto Exp $
** Buffered streams
** See Copyright Notice in lua.h
*/
#ifndef lzio_h
#define lzio_h
#include "lua.h"
#include "lmem.h"
#define EOZ (-1) /* end of stream */
typedef struct Zio ZIO;
#define char2int(c) cast(int, cast(unsigned char, (c)))
#define zgetc(z) (((z)->n--)>0 ? char2int(*(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_resetbuffer(buff) ((buff)->n = 0)
#define luaZ_resizebuffer(L, buff, size) \
(luaM_reallocvector(L, (buff)->buffer, (buff)->buffsize, size, char), \
(buff)->buffsize = size)
#define luaZ_freebuffer(L, buff) luaZ_resizebuffer(L, buff, 0)
LUAI_FUNC char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n);
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 */
LUAI_FUNC int luaZ_lookahead (ZIO *z);
/* --------- Private Part ------------------ */
struct Zio {
size_t n; /* bytes still unread */
const char *p; /* current position in buffer */
lua_Reader reader;
void* data; /* additional data */
lua_State *L; /* Lua state (for reader) */
};
LUAI_FUNC int luaZ_fill (ZIO *z);
#endif

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/*
** $Id: print.c,v 1.55a 2006/05/31 13:30:05 lhf Exp $
** print bytecodes
** See Copyright Notice in lua.h
*/
#include <ctype.h>
#include <stdio.h>
#define luac_c
#define LUA_CORE
#include "ldebug.h"
#include "lobject.h"
#include "lopcodes.h"
#include "lundump.h"
#define PrintFunction luaU_print
#define Sizeof(x) ((int)sizeof(x))
#define VOID(p) ((const void*)(p))
static void PrintString(const TString* ts)
{
const char* s=getstr(ts);
size_t i,n=ts->tsv.len;
putchar('"');
for (i=0; i<n; i++)
{
int c=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((unsigned char)c))
putchar(c);
else
printf("\\%03u",(unsigned char)c);
}
}
putchar('"');
}
static void PrintConstant(const Proto* f, int i)
{
const TValue* o=&f->k[i];
switch (ttype(o))
{
case LUA_TNIL:
printf("nil");
break;
case LUA_TBOOLEAN:
printf(bvalue(o) ? "true" : "false");
break;
case LUA_TNUMBER:
printf(LUA_NUMBER_FMT,nvalue(o));
break;
case LUA_TSTRING:
PrintString(rawtsvalue(o));
break;
default: /* cannot happen */
printf("? type=%d",ttype(o));
break;
}
}
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 bx=GETARG_Bx(i);
int sbx=GETARG_sBx(i);
int line=getline(f,pc);
printf("\t%d\t",pc+1);
if (line>0) printf("[%d]\t",line); else printf("[-]\t");
printf("%-9s\t",luaP_opnames[o]);
switch (getOpMode(o))
{
case iABC:
printf("%d",a);
if (getBMode(o)!=OpArgN) printf(" %d",ISK(b) ? (-1-INDEXK(b)) : b);
if (getCMode(o)!=OpArgN) printf(" %d",ISK(c) ? (-1-INDEXK(c)) : c);
break;
case iABx:
if (getBMode(o)==OpArgK) printf("%d %d",a,-1-bx); else printf("%d %d",a,bx);
break;
case iAsBx:
if (o==OP_JMP) printf("%d",sbx); else printf("%d %d",a,sbx);
break;
}
switch (o)
{
case OP_LOADK:
printf("\t; "); PrintConstant(f,bx);
break;
case OP_GETUPVAL:
case OP_SETUPVAL:
printf("\t; %s", (f->sizeupvalues>0) ? getstr(f->upvalues[b]) : "-");
break;
case OP_GETGLOBAL:
case OP_SETGLOBAL:
printf("\t; %s",svalue(&f->k[bx]));
break;
case OP_GETTABLE:
case OP_SELF:
if (ISK(c)) { printf("\t; "); PrintConstant(f,INDEXK(c)); }
break;
case OP_SETTABLE:
case OP_ADD:
case OP_SUB:
case OP_MUL:
case OP_DIV:
case OP_POW:
case OP_EQ:
case OP_LT:
case OP_LE:
if (ISK(b) || ISK(c))
{
printf("\t; ");
if (ISK(b)) PrintConstant(f,INDEXK(b)); else printf("-");
printf(" ");
if (ISK(c)) PrintConstant(f,INDEXK(c)); else printf("-");
}
break;
case OP_JMP:
case OP_FORLOOP:
case OP_FORPREP:
printf("\t; to %d",sbx+pc+2);
break;
case OP_CLOSURE:
printf("\t; %p",VOID(f->p[bx]));
break;
case OP_SETLIST:
if (c==0) printf("\t; %d",(int)code[++pc]);
else printf("\t; %d",c);
break;
default:
break;
}
printf("\n");
}
}
#define SS(x) (x==1)?"":"s"
#define S(x) x,SS(x)
static void PrintHeader(const Proto* f)
{
const char* s=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, %d bytes at %p)\n",
(f->linedefined==0)?"main":"function",s,
f->linedefined,f->lastlinedefined,
S(f->sizecode),f->sizecode*Sizeof(Instruction),VOID(f));
printf("%d%s param%s, %d slot%s, %d upvalue%s, ",
f->numparams,f->is_vararg?"+":"",SS(f->numparams),
S(f->maxstacksize),S(f->nups));
printf("%d local%s, %d constant%s, %d function%s\n",
S(f->sizelocvars),S(f->sizek),S(f->sizep));
}
static void PrintConstants(const Proto* f)
{
int i,n=f->sizek;
printf("constants (%d) for %p:\n",n,VOID(f));
for (i=0; i<n; i++)
{
printf("\t%d\t",i+1);
PrintConstant(f,i);
printf("\n");
}
}
static void PrintLocals(const Proto* f)
{
int i,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);
}
}
static void PrintUpvalues(const Proto* f)
{
int i,n=f->sizeupvalues;
printf("upvalues (%d) for %p:\n",n,VOID(f));
if (f->upvalues==NULL) return;
for (i=0; i<n; i++)
{
printf("\t%d\t%s\n",i,getstr(f->upvalues[i]));
}
}
void PrintFunction(const Proto* f, int full)
{
int i,n=f->sizep;
PrintHeader(f);
PrintCode(f);
if (full)
{
PrintConstants(f);
PrintLocals(f);
PrintUpvalues(f);
}
for (i=0; i<n; i++) PrintFunction(f->p[i],full);
}

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These are simple tests for Lua. Some of them contain useful code.
They are meant to be run to make sure Lua is built correctly and also
to be read, to see how Lua programs look.
Here is a one-line summary of each program:
bisect.lua bisection method for solving non-linear equations
cf.lua temperature conversion table (celsius to farenheit)
echo.lua echo command line arguments
env.lua environment variables as automatic global variables
factorial.lua factorial without recursion
fib.lua fibonacci function with cache
fibfor.lua fibonacci numbers with coroutines and generators
globals.lua report global variable usage
hello.lua the first program in every language
life.lua Conway's Game of Life
luac.lua bare-bones luac
printf.lua an implementation of printf
readonly.lua make global variables readonly
sieve.lua the sieve of of Eratosthenes programmed with coroutines
sort.lua two implementations of a sort function
table.lua make table, grouping all data for the same item
trace-calls.lua trace calls
trace-globals.lua trace assigments to global variables
xd.lua hex dump

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-- bisection method for solving non-linear equations
delta=1e-6 -- tolerance
function bisect(f,a,b,fa,fb)
local c=(a+b)/2
io.write(n," c=",c," a=",a," b=",b,"\n")
if c==a or c==b or math.abs(a-b)<delta then return c,b-a end
n=n+1
local fc=f(c)
if fa*fc<0 then return bisect(f,a,c,fa,fc) else return bisect(f,c,b,fc,fb) end
end
-- find root of f in the inverval [a,b]. needs f(a)*f(b)<0
function solve(f,a,b)
n=0
local z,e=bisect(f,a,b,f(a),f(b))
io.write(string.format("after %d steps, root is %.17g with error %.1e, f=%.1e\n",n,z,e,f(z)))
end
-- our function
function f(x)
return x*x*x-x-1
end
-- find zero in [1,2]
solve(f,1,2)

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-- temperature conversion table (celsius to farenheit)
for c0=-20,50-1,10 do
io.write("C ")
for c=c0,c0+10-1 do
io.write(string.format("%3.0f ",c))
end
io.write("\n")
io.write("F ")
for c=c0,c0+10-1 do
f=(9/5)*c+32
io.write(string.format("%3.0f ",f))
end
io.write("\n\n")
end

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-- echo command line arguments
for i=0,table.getn(arg) do
print(i,arg[i])
end

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-- read environment variables as if they were global variables
local f=function (t,i) return os.getenv(i) end
setmetatable(getfenv(),{__index=f})
-- an example
print(a,USER,PATH)

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-- function closures are powerful
-- traditional fixed-point operator from functional programming
Y = function (g)
local a = function (f) return f(f) end
return a(function (f)
return g(function (x)
local c=f(f)
return c(x)
end)
end)
end
-- factorial without recursion
F = function (f)
return function (n)
if n == 0 then return 1
else return n*f(n-1) end
end
end
factorial = Y(F) -- factorial is the fixed point of F
-- now test it
function test(x)
io.write(x,"! = ",factorial(x),"\n")
end
for n=0,16 do
test(n)
end

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-- fibonacci function with cache
-- very inefficient fibonacci function
function fib(n)
N=N+1
if n<2 then
return n
else
return fib(n-1)+fib(n-2)
end
end
-- a general-purpose value cache
function cache(f)
local c={}
return function (x)
local y=c[x]
if not y then
y=f(x)
c[x]=y
end
return y
end
end
-- run and time it
function test(s,f)
N=0
local c=os.clock()
local v=f(n)
local t=os.clock()-c
print(s,n,v,t,N)
end
n=arg[1] or 24 -- for other values, do lua fib.lua XX
n=tonumber(n)
print("","n","value","time","evals")
test("plain",fib)
fib=cache(fib)
test("cached",fib)

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-- example of for with generator functions
function generatefib (n)
return coroutine.wrap(function ()
local a,b = 1, 1
while a <= n do
coroutine.yield(a)
a, b = b, a+b
end
end)
end
for i in generatefib(1000) do print(i) end

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-- reads luac listings and reports global variable usage
-- lines where a global is written to are marked with "*"
-- typical usage: luac -p -l file.lua | lua globals.lua | sort | lua table.lua
while 1 do
local s=io.read()
if s==nil then break end
local ok,_,l,op,g=string.find(s,"%[%-?(%d*)%]%s*([GS])ETGLOBAL.-;%s+(.*)$")
if ok then
if op=="S" then op="*" else op="" end
io.write(g,"\t",l,op,"\n")
end
end

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-- the first program in every language
io.write("Hello world, from ",_VERSION,"!\n")

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-- life.lua
-- original by Dave Bollinger <DBollinger@compuserve.com> posted to lua-l
-- modified to use ANSI terminal escape sequences
-- modified to use for instead of while
local write=io.write
ALIVE="¥" DEAD="þ"
ALIVE="O" DEAD="-"
function delay() -- NOTE: SYSTEM-DEPENDENT, adjust as necessary
for i=1,10000 do end
-- local i=os.clock()+1 while(os.clock()<i) do end
end
function ARRAY2D(w,h)
local t = {w=w,h=h}
for y=1,h do
t[y] = {}
for x=1,w do
t[y][x]=0
end
end
return t
end
_CELLS = {}
-- give birth to a "shape" within the cell array
function _CELLS:spawn(shape,left,top)
for y=0,shape.h-1 do
for x=0,shape.w-1 do
self[top+y][left+x] = shape[y*shape.w+x+1]
end
end
end
-- run the CA and produce the next generation
function _CELLS:evolve(next)
local ym1,y,yp1,yi=self.h-1,self.h,1,self.h
while yi > 0 do
local xm1,x,xp1,xi=self.w-1,self.w,1,self.w
while xi > 0 do
local sum = self[ym1][xm1] + self[ym1][x] + self[ym1][xp1] +
self[y][xm1] + self[y][xp1] +
self[yp1][xm1] + self[yp1][x] + self[yp1][xp1]
next[y][x] = ((sum==2) and self[y][x]) or ((sum==3) and 1) or 0
xm1,x,xp1,xi = x,xp1,xp1+1,xi-1
end
ym1,y,yp1,yi = y,yp1,yp1+1,yi-1
end
end
-- output the array to screen
function _CELLS:draw()
local out="" -- accumulate to reduce flicker
for y=1,self.h do
for x=1,self.w do
out=out..(((self[y][x]>0) and ALIVE) or DEAD)
end
out=out.."\n"
end
write(out)
end
-- constructor
function CELLS(w,h)
local c = ARRAY2D(w,h)
c.spawn = _CELLS.spawn
c.evolve = _CELLS.evolve
c.draw = _CELLS.draw
return c
end
--
-- shapes suitable for use with spawn() above
--
HEART = { 1,0,1,1,0,1,1,1,1; w=3,h=3 }
GLIDER = { 0,0,1,1,0,1,0,1,1; w=3,h=3 }
EXPLODE = { 0,1,0,1,1,1,1,0,1,0,1,0; w=3,h=4 }
FISH = { 0,1,1,1,1,1,0,0,0,1,0,0,0,0,1,1,0,0,1,0; w=5,h=4 }
BUTTERFLY = { 1,0,0,0,1,0,1,1,1,0,1,0,0,0,1,1,0,1,0,1,1,0,0,0,1; w=5,h=5 }
-- the main routine
function LIFE(w,h)
-- create two arrays
local thisgen = CELLS(w,h)
local nextgen = CELLS(w,h)
-- create some life
-- about 1000 generations of fun, then a glider steady-state
thisgen:spawn(GLIDER,5,4)
thisgen:spawn(EXPLODE,25,10)
thisgen:spawn(FISH,4,12)
-- run until break
local gen=1
write("\027[2J") -- ANSI clear screen
while 1 do
thisgen:evolve(nextgen)
thisgen,nextgen = nextgen,thisgen
write("\027[H") -- ANSI home cursor
thisgen:draw()
write("Life - generation ",gen,"\n")
gen=gen+1
if gen>2000 then break end
--delay() -- no delay
end
end
LIFE(40,20)

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-- bare-bones luac in Lua
-- usage: lua luac.lua file.lua
assert(arg[1]~=nil and arg[2]==nil,"usage: lua luac.lua file.lua")
f=assert(io.open("luac.out","wb"))
assert(f:write(string.dump(assert(loadfile(arg[1])))))
assert(f:close())

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-- an implementation of printf
function printf(...)
io.write(string.format(...))
end
printf("Hello %s from %s on %s\n",os.getenv"USER" or "there",_VERSION,os.date())

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-- make global variables readonly
local f=function (t,i) error("cannot redefine global variable `"..i.."'",2) end
local g={}
local G=getfenv()
setmetatable(g,{__index=G,__newindex=f})
setfenv(1,g)
-- an example
rawset(g,"x",3)
x=2
y=1 -- cannot redefine `y'

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-- the sieve of of Eratosthenes programmed with coroutines
-- typical usage: lua -e N=1000 sieve.lua | column
-- generate all the numbers from 2 to n
function gen (n)
return coroutine.wrap(function ()
for i=2,n do coroutine.yield(i) end
end)
end
-- filter the numbers generated by `g', removing multiples of `p'
function filter (p, g)
return coroutine.wrap(function ()
while 1 do
local n = g()
if n == nil then return end
if math.mod(n, p) ~= 0 then coroutine.yield(n) end
end
end)
end
N=N or 1000 -- from command line
x = gen(N) -- generate primes up to N
while 1 do
local n = x() -- pick a number until done
if n == nil then break end
print(n) -- must be a prime number
x = filter(n, x) -- now remove its multiples
end

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-- two implementations of a sort function
-- this is an example only. Lua has now a built-in function "sort"
-- extracted from Programming Pearls, page 110
function qsort(x,l,u,f)
if l<u then
local m=math.random(u-(l-1))+l-1 -- choose a random pivot in range l..u
x[l],x[m]=x[m],x[l] -- swap pivot to first position
local t=x[l] -- pivot value
m=l
local i=l+1
while i<=u do
-- invariant: x[l+1..m] < t <= x[m+1..i-1]
if f(x[i],t) then
m=m+1
x[m],x[i]=x[i],x[m] -- swap x[i] and x[m]
end
i=i+1
end
x[l],x[m]=x[m],x[l] -- swap pivot to a valid place
-- x[l+1..m-1] < x[m] <= x[m+1..u]
qsort(x,l,m-1,f)
qsort(x,m+1,u,f)
end
end
function selectionsort(x,n,f)
local i=1
while i<=n do
local m,j=i,i+1
while j<=n do
if f(x[j],x[m]) then m=j end
j=j+1
end
x[i],x[m]=x[m],x[i] -- swap x[i] and x[m]
i=i+1
end
end
function show(m,x)
io.write(m,"\n\t")
local i=1
while x[i] do
io.write(x[i])
i=i+1
if x[i] then io.write(",") end
end
io.write("\n")
end
function testsorts(x)
local n=1
while x[n] do n=n+1 end; n=n-1 -- count elements
show("original",x)
qsort(x,1,n,function (x,y) return x<y end)
show("after quicksort",x)
selectionsort(x,n,function (x,y) return x>y end)
show("after reverse selection sort",x)
qsort(x,1,n,function (x,y) return x<y end)
show("after quicksort again",x)
end
-- array to be sorted
x={"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"}
testsorts(x)

12
test/table.lua Normal file
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@ -0,0 +1,12 @@
-- make table, grouping all data for the same item
-- input is 2 columns (item, data)
local A
while 1 do
local l=io.read()
if l==nil then break end
local _,_,a,b=string.find(l,'"?([_%w]+)"?%s*(.*)$')
if a~=A then A=a io.write("\n",a,":") end
io.write(" ",b)
end
io.write("\n")

32
test/trace-calls.lua Normal file
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@ -0,0 +1,32 @@
-- trace calls
-- example: lua -ltrace-calls bisect.lua
local level=0
local function hook(event)
local t=debug.getinfo(3)
io.write(level," >>> ",string.rep(" ",level))
if t~=nil and t.currentline>=0 then io.write(t.short_src,":",t.currentline," ") end
t=debug.getinfo(2)
if event=="call" then
level=level+1
else
level=level-1 if level<0 then level=0 end
end
if t.what=="main" then
if event=="call" then
io.write("begin ",t.short_src)
else
io.write("end ",t.short_src)
end
elseif t.what=="Lua" then
-- table.foreach(t,print)
io.write(event," ",t.name or "(Lua)"," <",t.linedefined,":",t.short_src,">")
else
io.write(event," ",t.name or "(C)"," [",t.what,"] ")
end
io.write("\n")
end
debug.sethook(hook,"cr")
level=0

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