3 ** Configuration file for Lua
4 ** See Copyright Notice in lua.h
16 ** ===================================================================
17 ** General Configuration File for Lua
19 ** Some definitions here can be changed externally, through the
20 ** compiler (e.g., with '-D' options). Those are protected by
21 ** '#if !defined' guards. However, several other definitions should
22 ** be changed directly here, either because they affect the Lua
23 ** ABI (by making the changes here, you ensure that all software
24 ** connected to Lua, such as C libraries, will be compiled with the
25 ** same configuration); or because they are seldom changed.
27 ** Search for "@@" to find all configurable definitions.
28 ** ===================================================================
33 ** {====================================================================
34 ** System Configuration: macros to adapt (if needed) Lua to some
35 ** particular platform, for instance restricting it to C89.
36 ** =====================================================================
40 @@ LUA_USE_C89 controls the use of non-ISO-C89 features.
41 ** Define it if you want Lua to avoid the use of a few C99 features
42 ** or Windows-specific features on Windows.
44 /* #define LUA_USE_C89 */
48 ** By default, Lua on Windows use (some) specific Windows features
50 #if !defined(LUA_USE_C89) && defined(_WIN32) && !defined(_WIN32_WCE)
51 #define LUA_USE_WINDOWS /* enable goodies for regular Windows */
55 #if defined(LUA_USE_WINDOWS)
56 #define LUA_DL_DLL /* enable support for DLL */
57 #define LUA_USE_C89 /* broadly, Windows is C89 */
61 #if defined(LUA_USE_LINUX)
63 #define LUA_USE_DLOPEN /* needs an extra library: -ldl */
67 #if defined(LUA_USE_MACOSX)
69 #define LUA_USE_DLOPEN /* MacOS does not need -ldl */
74 @@ LUAI_IS32INT is true iff 'int' has (at least) 32 bits.
76 #define LUAI_IS32INT ((UINT_MAX >> 30) >= 3)
78 /* }================================================================== */
83 ** {==================================================================
84 ** Configuration for Number types.
85 ** ===================================================================
89 @@ LUA_32BITS enables Lua with 32-bit integers and 32-bit floats.
91 /* #define LUA_32BITS */
95 @@ LUA_C89_NUMBERS ensures that Lua uses the largest types available for
96 ** C89 ('long' and 'double'); Windows always has '__int64', so it does
97 ** not need to use this case.
99 #if defined(LUA_USE_C89) && !defined(LUA_USE_WINDOWS)
100 #define LUA_C89_NUMBERS
105 @@ LUA_INT_TYPE defines the type for Lua integers.
106 @@ LUA_FLOAT_TYPE defines the type for Lua floats.
107 ** Lua should work fine with any mix of these options supported
108 ** by your C compiler. The usual configurations are 64-bit integers
109 ** and 'double' (the default), 32-bit integers and 'float' (for
110 ** restricted platforms), and 'long'/'double' (for C compilers not
111 ** compliant with C99, which may not have support for 'long long').
114 /* predefined options for LUA_INT_TYPE */
115 #define LUA_INT_INT 1
116 #define LUA_INT_LONG 2
117 #define LUA_INT_LONGLONG 3
119 /* predefined options for LUA_FLOAT_TYPE */
120 #define LUA_FLOAT_FLOAT 1
121 #define LUA_FLOAT_DOUBLE 2
122 #define LUA_FLOAT_LONGDOUBLE 3
123 #define LUA_FLOAT_INT64 4
125 #if defined(LUA_32BITS) /* { */
127 ** 32-bit integers and 'float'
129 #if LUAI_IS32INT /* use 'int' if big enough */
130 #define LUA_INT_TYPE LUA_INT_INT
131 #else /* otherwise use 'long' */
132 #define LUA_INT_TYPE LUA_INT_LONG
134 #define LUA_FLOAT_TYPE LUA_FLOAT_FLOAT
136 #elif defined(LUA_C89_NUMBERS) /* }{ */
138 ** largest types available for C89 ('long' and 'double')
140 #define LUA_INT_TYPE LUA_INT_LONG
141 #define LUA_FLOAT_TYPE LUA_FLOAT_DOUBLE
147 ** default configuration for 64-bit Lua ('long long' and 'double')
149 #if !defined(LUA_INT_TYPE)
150 #define LUA_INT_TYPE LUA_INT_LONGLONG
153 #if !defined(LUA_FLOAT_TYPE)
154 #define LUA_FLOAT_TYPE LUA_FLOAT_DOUBLE
157 /* }================================================================== */
162 ** {==================================================================
163 ** Configuration for Paths.
164 ** ===================================================================
168 ** LUA_PATH_SEP is the character that separates templates in a path.
169 ** LUA_PATH_MARK is the string that marks the substitution points in a
171 ** LUA_EXEC_DIR in a Windows path is replaced by the executable's
174 #define LUA_PATH_SEP ";"
175 #define LUA_PATH_MARK "?"
176 #define LUA_EXEC_DIR "!"
180 @@ LUA_PATH_DEFAULT is the default path that Lua uses to look for
182 @@ LUA_CPATH_DEFAULT is the default path that Lua uses to look for
184 ** CHANGE them if your machine has a non-conventional directory
185 ** hierarchy or if you want to install your libraries in
186 ** non-conventional directories.
189 #define LUA_VDIR LUA_VERSION_MAJOR "." LUA_VERSION_MINOR
190 #if defined(_WIN32) /* { */
192 ** In Windows, any exclamation mark ('!') in the path is replaced by the
193 ** path of the directory of the executable file of the current process.
195 #define LUA_LDIR "!\\lua\\"
196 #define LUA_CDIR "!\\"
197 #define LUA_SHRDIR "!\\..\\share\\lua\\" LUA_VDIR "\\"
199 #if !defined(LUA_PATH_DEFAULT)
200 #define LUA_PATH_DEFAULT \
201 LUA_LDIR"?.lua;" LUA_LDIR"?\\init.lua;" \
202 LUA_CDIR"?.lua;" LUA_CDIR"?\\init.lua;" \
203 LUA_SHRDIR"?.lua;" LUA_SHRDIR"?\\init.lua;" \
204 ".\\?.lua;" ".\\?\\init.lua"
207 #if !defined(LUA_CPATH_DEFAULT)
208 #define LUA_CPATH_DEFAULT \
210 LUA_CDIR"..\\lib\\lua\\" LUA_VDIR "\\?.dll;" \
211 LUA_CDIR"loadall.dll;" ".\\?.dll"
216 #define LUA_ROOT LUA_PATH "/" LUA_VDIR "/"
217 #define LUA_LDIR LUA_ROOT "share/"
218 #define LUA_CDIR LUA_ROOT "lib/"
220 #if !defined(LUA_PATH_DEFAULT)
221 #define LUA_PATH_DEFAULT \
222 LUA_LDIR"?.lua;" LUA_LDIR"?/init.lua;" \
223 LUA_CDIR"?.lua;" LUA_CDIR"?/init.lua;" \
224 "./?.lua;" "./?/init.lua"
227 #if !defined(LUA_CPATH_DEFAULT)
228 #define LUA_CPATH_DEFAULT \
229 LUA_CDIR"?.so;" LUA_CDIR"loadall.so;" "./?.so"
236 @@ LUA_DIRSEP is the directory separator (for submodules).
237 ** CHANGE it if your machine does not use "/" as the directory separator
238 ** and is not Windows. (On Windows Lua automatically uses "\".)
240 #if !defined(LUA_DIRSEP)
243 #define LUA_DIRSEP "\\"
245 #define LUA_DIRSEP "/"
250 /* }================================================================== */
254 ** {==================================================================
255 ** Marks for exported symbols in the C code
256 ** ===================================================================
260 @@ LUA_API is a mark for all core API functions.
261 @@ LUALIB_API is a mark for all auxiliary library functions.
262 @@ LUAMOD_API is a mark for all standard library opening functions.
263 ** CHANGE them if you need to define those functions in some special way.
264 ** For instance, if you want to create one Windows DLL with the core and
265 ** the libraries, you may want to use the following definition (define
266 ** LUA_BUILD_AS_DLL to get it).
268 #if defined(LUA_BUILD_AS_DLL) /* { */
270 #if defined(LUA_CORE) || defined(LUA_LIB) /* { */
271 #define LUA_API __declspec(dllexport)
273 #define LUA_API __declspec(dllimport)
278 #define LUA_API extern
284 ** More often than not the libs go together with the core.
286 #define LUALIB_API LUA_API
287 #define LUAMOD_API LUA_API
291 @@ LUAI_FUNC is a mark for all extern functions that are not to be
292 ** exported to outside modules.
293 @@ LUAI_DDEF and LUAI_DDEC are marks for all extern (const) variables,
294 ** none of which to be exported to outside modules (LUAI_DDEF for
295 ** definitions and LUAI_DDEC for declarations).
296 ** CHANGE them if you need to mark them in some special way. Elf/gcc
297 ** (versions 3.2 and later) mark them as "hidden" to optimize access
298 ** when Lua is compiled as a shared library. Not all elf targets support
299 ** this attribute. Unfortunately, gcc does not offer a way to check
300 ** whether the target offers that support, and those without support
301 ** give a warning about it. To avoid these warnings, change to the
302 ** default definition.
304 #if defined(__GNUC__) && ((__GNUC__*100 + __GNUC_MINOR__) >= 302) && \
305 defined(__ELF__) /* { */
306 #define LUAI_FUNC __attribute__((visibility("internal"))) extern
308 #define LUAI_FUNC extern
311 #define LUAI_DDEC(dec) LUAI_FUNC dec
312 #define LUAI_DDEF /* empty */
314 /* }================================================================== */
318 ** {==================================================================
319 ** Compatibility with previous versions
320 ** ===================================================================
324 @@ LUA_COMPAT_5_3 controls other macros for compatibility with Lua 5.3.
325 ** You can define it to get all options, or change specific options
326 ** to fit your specific needs.
328 #if defined(LUA_COMPAT_5_3) /* { */
331 @@ LUA_COMPAT_MATHLIB controls the presence of several deprecated
332 ** functions in the mathematical library.
333 ** (These functions were already officially removed in 5.3;
334 ** nevertheless they are still available here.)
336 #define LUA_COMPAT_MATHLIB
339 @@ LUA_COMPAT_APIINTCASTS controls the presence of macros for
340 ** manipulating other integer types (lua_pushunsigned, lua_tounsigned,
341 ** luaL_checkint, luaL_checklong, etc.)
342 ** (These macros were also officially removed in 5.3, but they are still
345 #define LUA_COMPAT_APIINTCASTS
349 @@ LUA_COMPAT_LT_LE controls the emulation of the '__le' metamethod
352 #define LUA_COMPAT_LT_LE
356 @@ The following macros supply trivial compatibility for some
357 ** changes in the API. The macros themselves document how to
358 ** change your code to avoid using them.
359 ** (Once more, these macros were officially removed in 5.3, but they are
360 ** still available here.)
362 #define lua_strlen(L,i) lua_rawlen(L, (i))
364 #define lua_objlen(L,i) lua_rawlen(L, (i))
366 #define lua_equal(L,idx1,idx2) lua_compare(L,(idx1),(idx2),LUA_OPEQ)
367 #define lua_lessthan(L,idx1,idx2) lua_compare(L,(idx1),(idx2),LUA_OPLT)
371 /* }================================================================== */
376 ** {==================================================================
377 ** Configuration for Numbers.
378 ** Change these definitions if no predefined LUA_FLOAT_* / LUA_INT_*
379 ** satisfy your needs.
380 ** ===================================================================
384 @@ LUA_NUMBER is the floating-point type used by Lua.
385 @@ LUAI_UACNUMBER is the result of a 'default argument promotion'
386 @@ over a floating number.
387 @@ l_floatatt(x) corrects float attribute 'x' to the proper float type
388 ** by prefixing it with one of FLT/DBL/LDBL.
389 @@ LUA_NUMBER_FRMLEN is the length modifier for writing floats.
390 @@ LUA_NUMBER_FMT is the format for writing floats.
391 @@ lua_number2str converts a float to a string.
392 @@ l_mathop allows the addition of an 'l' or 'f' to all math operations.
393 @@ l_floor takes the floor of a float.
394 @@ lua_str2number converts a decimal numeral to a number.
398 /* The following definitions are good for most cases here */
400 #define l_floor(x) (l_mathop(floor)(x))
402 #define lua_number2str(s,sz,n) \
403 l_sprintf((s), sz, LUA_NUMBER_FMT, (LUAI_UACNUMBER)(n))
406 @@ lua_numbertointeger converts a float number with an integral value
407 ** to an integer, or returns 0 if float is not within the range of
408 ** a lua_Integer. (The range comparisons are tricky because of
409 ** rounding. The tests here assume a two-complement representation,
410 ** where MININTEGER always has an exact representation as a float;
411 ** MAXINTEGER may not have one, and therefore its conversion to float
412 ** may have an ill-defined value.)
414 #define lua_numbertointeger(n,p) \
415 (*(p) = (LUA_INTEGER)(n), 1)
418 /* now the variable definitions */
420 #if LUA_FLOAT_TYPE == LUA_FLOAT_FLOAT /* { single float */
422 #define LUA_NUMBER float
424 #define l_floatatt(n) (FLT_##n)
426 #define LUAI_UACNUMBER double
428 #define LUA_NUMBER_FRMLEN ""
429 #define LUA_NUMBER_FMT "%.7g"
431 #define l_mathop(op) op##f
433 #define lua_str2number(s,p) strtof((s), (p))
436 #elif LUA_FLOAT_TYPE == LUA_FLOAT_LONGDOUBLE /* }{ long double */
438 #define LUA_NUMBER long double
440 #define l_floatatt(n) (LDBL_##n)
442 #define LUAI_UACNUMBER long double
444 #define LUA_NUMBER_FRMLEN "L"
445 #define LUA_NUMBER_FMT "%.19Lg"
447 #define l_mathop(op) op##l
449 #define lua_str2number(s,p) strtold((s), (p))
451 #elif LUA_FLOAT_TYPE == LUA_FLOAT_DOUBLE /* }{ double */
453 #define LUA_NUMBER double
455 #define l_floatatt(n) (DBL_##n)
457 #define LUAI_UACNUMBER double
459 #define LUA_NUMBER_FRMLEN ""
460 #define LUA_NUMBER_FMT "%.14g"
462 #define l_mathop(op) op
464 #define lua_str2number(s,p) strtod((s), (p))
466 #elif LUA_FLOAT_TYPE == LUA_FLOAT_INT64 /* }{ int64 */
470 #include <machine/_inttypes.h>
472 #define panic lua_panic
473 /* Hack to use int64 as the LUA_NUMBER from ZFS code, kinda */
475 #define LUA_NUMBER int64_t
477 #define l_mathlim(n) (LUA_FLOAT_INT_HACK_##n)
478 #define LUA_FLOAT_INT_HACK_MANT_DIG 32
479 #define LUA_FLOAT_INT_HACK_MAX_10_EXP 32
481 #define LUAI_UACNUMBER int64_t
483 #define LUA_NUMBER_FRMLEN ""
484 #define LUA_NUMBER_FMT "%" PRId64
486 #define l_mathop(x) (lstd_ ## x)
488 #define lua_str2number(s,p) strtoll((s), (p), 0)
490 #define lua_getlocaledecpoint() '.'
494 #error "numeric float type not defined"
501 @@ LUA_INTEGER is the integer type used by Lua.
503 @@ LUA_UNSIGNED is the unsigned version of LUA_INTEGER.
505 @@ LUAI_UACINT is the result of a 'default argument promotion'
506 @@ over a LUA_INTEGER.
507 @@ LUA_INTEGER_FRMLEN is the length modifier for reading/writing integers.
508 @@ LUA_INTEGER_FMT is the format for writing integers.
509 @@ LUA_MAXINTEGER is the maximum value for a LUA_INTEGER.
510 @@ LUA_MININTEGER is the minimum value for a LUA_INTEGER.
511 @@ LUA_MAXUNSIGNED is the maximum value for a LUA_UNSIGNED.
512 @@ LUA_UNSIGNEDBITS is the number of bits in a LUA_UNSIGNED.
513 @@ lua_integer2str converts an integer to a string.
517 /* The following definitions are good for most cases here */
519 #define LUA_INTEGER_FMT "%" LUA_INTEGER_FRMLEN "d"
521 #define LUAI_UACINT LUA_INTEGER
523 #define lua_integer2str(s,sz,n) \
524 l_sprintf((s), sz, LUA_INTEGER_FMT, (LUAI_UACINT)(n))
527 ** use LUAI_UACINT here to avoid problems with promotions (which
528 ** can turn a comparison between unsigneds into a signed comparison)
530 #define LUA_UNSIGNED unsigned LUAI_UACINT
533 #define LUA_UNSIGNEDBITS (sizeof(LUA_UNSIGNED) * CHAR_BIT)
536 /* now the variable definitions */
538 #if LUA_INT_TYPE == LUA_INT_INT /* { int */
540 #define LUA_INTEGER int
541 #define LUA_INTEGER_FRMLEN ""
543 #define LUA_MAXINTEGER INT_MAX
544 #define LUA_MININTEGER INT_MIN
546 #define LUA_MAXUNSIGNED UINT_MAX
548 #elif LUA_INT_TYPE == LUA_INT_LONG /* }{ long */
550 #define LUA_INTEGER long
551 #define LUA_INTEGER_FRMLEN "l"
553 #define LUA_MAXINTEGER LONG_MAX
554 #define LUA_MININTEGER LONG_MIN
556 #define LUA_MAXUNSIGNED ULONG_MAX
558 #elif LUA_INT_TYPE == LUA_INT_LONGLONG /* }{ long long */
560 /* use presence of macro LLONG_MAX as proxy for C99 compliance */
561 #if defined(LLONG_MAX) /* { */
562 /* use ISO C99 stuff */
564 #define LUA_INTEGER long long
565 #define LUA_INTEGER_FRMLEN "ll"
567 #define LUA_MAXINTEGER LLONG_MAX
568 #define LUA_MININTEGER LLONG_MIN
570 #define LUA_MAXUNSIGNED ULLONG_MAX
572 #elif defined(LUA_USE_WINDOWS) /* }{ */
573 /* in Windows, can use specific Windows types */
575 #define LUA_INTEGER __int64
576 #define LUA_INTEGER_FRMLEN "I64"
578 #define LUA_MAXINTEGER _I64_MAX
579 #define LUA_MININTEGER _I64_MIN
581 #define LUA_MAXUNSIGNED _UI64_MAX
585 #error "Compiler does not support 'long long'. Use option '-DLUA_32BITS' \
586 or '-DLUA_C89_NUMBERS' (see file 'luaconf.h' for details)"
592 #error "numeric integer type not defined"
596 /* }================================================================== */
600 ** {==================================================================
601 ** Dependencies with C99 and other C details
602 ** ===================================================================
606 @@ l_sprintf is equivalent to 'snprintf' or 'sprintf' in C89.
607 ** (All uses in Lua have only one format item.)
609 #if !defined(LUA_USE_C89)
610 #define l_sprintf(s,sz,f,i) snprintf(s,sz,f,i)
612 #define l_sprintf(s,sz,f,i) ((void)(sz), sprintf(s,f,i))
617 @@ lua_strx2number converts a hexadecimal numeral to a number.
618 ** In C99, 'strtod' does that conversion. Otherwise, you can
619 ** leave 'lua_strx2number' undefined and Lua will provide its own
622 #if !defined(LUA_USE_C89)
623 #define lua_strx2number(s,p) lua_str2number(s,p)
628 @@ lua_pointer2str converts a pointer to a readable string in a
629 ** non-specified way.
631 #define lua_pointer2str(buff,sz,p) l_sprintf(buff,sz,"%p",p)
635 @@ lua_number2strx converts a float to a hexadecimal numeral.
636 ** In C99, 'sprintf' (with format specifiers '%a'/'%A') does that.
637 ** Otherwise, you can leave 'lua_number2strx' undefined and Lua will
638 ** provide its own implementation.
640 #if !defined(LUA_USE_C89)
641 #define lua_number2strx(L,b,sz,f,n) \
642 ((void)L, l_sprintf(b,sz,f,(LUAI_UACNUMBER)(n)))
647 ** 'strtof' and 'opf' variants for math functions are not valid in
648 ** C89. Otherwise, the macro 'HUGE_VALF' is a good proxy for testing the
649 ** availability of these variants. ('math.h' is already included in
650 ** all files that use these macros.)
652 #if defined(LUA_USE_C89) || (defined(HUGE_VAL) && !defined(HUGE_VALF))
653 #undef l_mathop /* variants not available */
654 #undef lua_str2number
655 #define l_mathop(op) (lua_Number)op /* no variant */
656 #define lua_str2number(s,p) ((lua_Number)strtod((s), (p)))
661 @@ LUA_KCONTEXT is the type of the context ('ctx') for continuation
662 ** functions. It must be a numerical type; Lua will use 'intptr_t' if
663 ** available, otherwise it will use 'ptrdiff_t' (the nearest thing to
664 ** 'intptr_t' in C89)
666 #define LUA_KCONTEXT ptrdiff_t
668 #if !defined(LUA_USE_C89) && defined(__STDC_VERSION__) && \
669 __STDC_VERSION__ >= 199901L
671 #if defined(INTPTR_MAX) /* even in C99 this type is optional */
673 #define LUA_KCONTEXT intptr_t
679 @@ lua_getlocaledecpoint gets the locale "radix character" (decimal point).
680 ** Change that if you do not want to use C locales. (Code using this
681 ** macro must include the header 'locale.h'.)
683 #if !defined(lua_getlocaledecpoint)
684 #define lua_getlocaledecpoint() (localeconv()->decimal_point[0])
687 /* }================================================================== */
691 ** {==================================================================
692 ** Language Variations
693 ** =====================================================================
697 @@ LUA_NOCVTN2S/LUA_NOCVTS2N control how Lua performs some
698 ** coercions. Define LUA_NOCVTN2S to turn off automatic coercion from
699 ** numbers to strings. Define LUA_NOCVTS2N to turn off automatic
700 ** coercion from strings to numbers.
702 /* #define LUA_NOCVTN2S */
703 /* #define LUA_NOCVTS2N */
707 @@ LUA_USE_APICHECK turns on several consistency checks on the C API.
708 ** Define it as a help when debugging C code.
710 #if defined(LUA_USE_APICHECK)
712 #define luai_apicheck(l,e) assert(e)
715 /* }================================================================== */
719 ** {==================================================================
720 ** Macros that affect the API and must be stable (that is, must be the
721 ** same when you compile Lua and when you compile code that links to
723 ** =====================================================================
727 @@ LUAI_MAXSTACK limits the size of the Lua stack.
728 ** CHANGE it if you need a different limit. This limit is arbitrary;
729 ** its only purpose is to stop Lua from consuming unlimited stack
730 ** space (and to reserve some numbers for pseudo-indices).
731 ** (It must fit into max(size_t)/32.)
734 #define LUAI_MAXSTACK 1000000
736 #define LUAI_MAXSTACK 15000
741 @@ LUA_EXTRASPACE defines the size of a raw memory area associated with
742 ** a Lua state with very fast access.
743 ** CHANGE it if you need a different size.
745 #define LUA_EXTRASPACE (sizeof(void *))
749 @@ LUA_IDSIZE gives the maximum size for the description of the source
750 @@ of a function in debug information.
751 ** CHANGE it if you want a different size.
753 #define LUA_IDSIZE 60
757 @@ LUAL_BUFFERSIZE is the buffer size used by the lauxlib buffer system.
759 #define LUAL_BUFFERSIZE 128
763 @@ LUAI_MAXALIGN defines fields that, when used in a union, ensure
764 ** maximum alignment for the other items in that union.
766 #define LUAI_MAXALIGN lua_Number n; void *s; lua_Integer i; long l
768 /* }================================================================== */
774 /* =================================================================== */
777 ** Local configuration. You can use this space to add your redefinitions
778 ** without modifying the main part of the file.