Compile Lua To C
Lua C Converter

Conversion of Lua scripts to C scripts is only 'possible' by rewriting the code, or using some kind of utility like (lua2cc). This of course requires that you know what you are doing and that you possess at least basic knowledge of programming, but no lua to c conversion utility likely exists. As Lua has progressed through 5.1, 5.2, and 5.3 (with 5.4 on the horizon), however, some of the packages have not been updated, so Holt cannot use them with recent releases of the language. Many of the Lua libraries are written in C, which need to be compiled and distributed as binaries for some users. Lua has automatic memory management, and garbage collection. And is only valid inside the blockwhere it was created. A C function called from Lua is a block, and its parameters are valid only until its end. A good programming practice is to convert Lua objects to C values as soon as they are available.

Convert string to integer, in Lua. This language bar is your friend. Select your favorite languages! Select your favorite languages.

LuaJIT adds some extensions to the standard Lua/C API. The LuaJIT includedirectory must be in the compiler search path (-Ipath)to be able to include the required header for C code:

Or for C++ code:

`luaJIT_setmode(L, idx, mode)`— Control VM

This is a C API extension to allow control of the VM from C code. Thefull prototype of LuaJIT_setmode is:

The returned status is either success (1) or failure (0).The second argument is either 0 or a stack index (similar to theother Lua/C API functions).

The third argument specifies the mode, which is 'or'ed with a flag.The flag can be LUAJIT_MODE_OFF to turn a feature off,LUAJIT_MODE_ON to turn a feature on, orLUAJIT_MODE_FLUSH to flush cached code.

The following modes are defined:

Compile Lua To C

`luaJIT_setmode(L, 0, LUAJIT_MODE_ENGINE|flag)`

Turn the whole JIT compiler on or off or flush the whole cache of compiled code.

`luaJIT_setmode(L, idx, LUAJIT_MODE_FUNC|flag)`
`luaJIT_setmode(L, idx, LUAJIT_MODE_ALLFUNC|flag)`
`luaJIT_setmode(L, idx, LUAJIT_MODE_ALLSUBFUNC|flag)`

This sets the mode for the function at the stack index idx orthe parent of the calling function (idx = 0). It eitherenables JIT compilation for a function, disables it and flushes anyalready compiled code or only flushes already compiled code. Thisapplies recursively to all sub-functions of the function withLUAJIT_MODE_ALLFUNC or only to the sub-functions withLUAJIT_MODE_ALLSUBFUNC.

`luaJIT_setmode(L, trace, LUAJIT_MODE_TRACE|LUAJIT_MODE_FLUSH)`

Flushes the specified root trace and all of its side traces from the cache.The code for the trace will be retained as long as there are any othertraces which link to it.

`luaJIT_setmode(L, idx, LUAJIT_MODE_WRAPCFUNC|flag)`

This mode defines a wrapper function for calls to C functions. Ifcalled with LUAJIT_MODE_ON, the stack index at idxmust be a lightuserdata object holding a pointer to the wrapperfunction. From now on all C functions are called through the wrapperfunction. If called with LUAJIT_MODE_OFF this mode is turnedoff and all C functions are directly called.

The wrapper function can be used for debugging purposes or to catchand convert foreign exceptions. But please read the section onC++ exception interoperabilityfirst. Recommended usage can be seen in this C++ code excerpt:

Note that you can only define a single global wrapper function,so be careful when using this mechanism from multiple C++ modules.Also note that this mechanism is not without overhead.

Lua C Converter

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This library offers basic facilities to convert Lua values to andfrom C structs.Its main functions arestruct.pack,which packs multiple Lua values into a struct-like string;and struct.unpack,which unpacks multiple Lua values from a given struct-like string.

The fist argument to both functions is aformat string,which describes the layout of the structure.The format string is a sequence of conversion elements,which respect the current endianess and the current alignment requirements.Initially, the current endianess is the machine's native endiannessand the current alignment requirement is 1(meaning no alignment at all).You can change these settings with appropriate directives inthe format string.

The elements in the format string are as follows:

' ' (empty space) ignored.
'!n'flag to set the current alignment requirement to n(necessarily a power of 2);an absent n means the machine's native alignment.
'>' flag to set mode to big endian.
'<' flag to set mode to little endian.
'x' a padding zero byte with no corresponding Lua value.
'b' a signed char.
'B' an unsigned char.
'h' a signed short (native size).
'H' an unsigned short (native size).
'l' a signed long (native size).
'L' an unsigned long (native size).
'T' a size_t (native size).
'in' a signed integer with n bytes.An absent n means the native size of an int.
'In' like 'in' but unsigned.
'f' a float (native size).
'd' a double (native size).
's' a zero-terminated string.
'cn' a sequence of exactly n charscorresponding to a single Lua string.An absent n means 1.When packing, the given string must have at least n characters(extra characters are discarded).
'c0' this is like 'cn',except that the n is given by other means:When packing, n is the length of the given string;when unpacking, n is the value of the previous unpacked value(which must be a number).In that case, this previous value is not returned.

Lua API

Examples

luaJIT_setmode(L, idx, mode)— Control VM

Compile Lua To C

luaJIT_setmode(L, 0, LUAJIT_MODE_ENGINE|flag)

luaJIT_setmode(L, idx, LUAJIT_MODE_FUNC|flag)luaJIT_setmode(L, idx, LUAJIT_MODE_ALLFUNC|flag)luaJIT_setmode(L, idx, LUAJIT_MODE_ALLSUBFUNC|flag)

luaJIT_setmode(L, trace, LUAJIT_MODE_TRACE|LUAJIT_MODE_FLUSH)

luaJIT_setmode(L, idx, LUAJIT_MODE_WRAPCFUNC|flag)

Lua C Conversion