You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
323 lines
7.5 KiB
323 lines
7.5 KiB
/* |
|
** $Id: llimits.h,v 1.141.1.1 2017/04/19 17:20:42 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" |
|
|
|
/* |
|
** 'lu_mem' and 'l_mem' are unsigned/signed integers big enough to count |
|
** the total memory used by Lua (in bytes). Usually, 'size_t' and |
|
** 'ptrdiff_t' should work, but we use 'long' for 16-bit machines. |
|
*/ |
|
#if defined(LUAI_MEM) /* { external definitions? */ |
|
typedef LUAI_UMEM lu_mem; |
|
typedef LUAI_MEM l_mem; |
|
#elif LUAI_BITSINT >= 32 /* }{ */ |
|
typedef size_t lu_mem; |
|
typedef ptrdiff_t l_mem; |
|
#else /* 16-bit ints */ /* }{ */ |
|
typedef unsigned long lu_mem; |
|
typedef long l_mem; |
|
#endif /* } */ |
|
|
|
|
|
/* chars used as small naturals (so that 'char' is reserved for characters) */ |
|
typedef unsigned char lu_byte; |
|
|
|
|
|
/* maximum value for size_t */ |
|
#define MAX_SIZET ((size_t)(~(size_t)0)) |
|
|
|
/* maximum size visible for Lua (must be representable in a lua_Integer */ |
|
#define MAX_SIZE (sizeof(size_t) < sizeof(lua_Integer) ? MAX_SIZET \ |
|
: (size_t)(LUA_MAXINTEGER)) |
|
|
|
|
|
#define MAX_LUMEM ((lu_mem)(~(lu_mem)0)) |
|
|
|
#define MAX_LMEM ((l_mem)(MAX_LUMEM >> 1)) |
|
|
|
|
|
#define MAX_INT INT_MAX /* maximum value of an int */ |
|
|
|
|
|
/* |
|
** conversion of pointer to unsigned integer: |
|
** this is for hashing only; there is no problem if the integer |
|
** cannot hold the whole pointer value |
|
*/ |
|
#define point2uint(p) ((unsigned int)((size_t)(p) & UINT_MAX)) |
|
|
|
|
|
|
|
/* type to ensure maximum alignment */ |
|
#if defined(LUAI_USER_ALIGNMENT_T) |
|
typedef LUAI_USER_ALIGNMENT_T L_Umaxalign; |
|
#else |
|
typedef union { |
|
lua_Number n; |
|
double u; |
|
void *s; |
|
lua_Integer i; |
|
long l; |
|
} L_Umaxalign; |
|
#endif |
|
|
|
|
|
|
|
/* types of 'usual argument conversions' for lua_Number and lua_Integer */ |
|
typedef LUAI_UACNUMBER l_uacNumber; |
|
typedef LUAI_UACINT l_uacInt; |
|
|
|
|
|
/* internal assertions for in-house debugging */ |
|
#if defined(lua_assert) |
|
#define check_exp(c,e) (lua_assert(c), (e)) |
|
/* to avoid problems with conditions too long */ |
|
#define lua_longassert(c) ((c) ? (void)0 : lua_assert(0)) |
|
#else |
|
#define lua_assert(c) ((void)0) |
|
#define check_exp(c,e) (e) |
|
#define lua_longassert(c) ((void)0) |
|
#endif |
|
|
|
/* |
|
** assertion for checking API calls |
|
*/ |
|
#if !defined(luai_apicheck) |
|
#define luai_apicheck(l,e) lua_assert(e) |
|
#endif |
|
|
|
#define api_check(l,e,msg) luai_apicheck(l,(e) && msg) |
|
|
|
|
|
/* macro to avoid warnings about unused variables */ |
|
#if !defined(UNUSED) |
|
#define UNUSED(x) ((void)(x)) |
|
#endif |
|
|
|
|
|
/* type casts (a macro highlights casts in the code) */ |
|
#define cast(t, exp) ((t)(exp)) |
|
|
|
#define cast_void(i) cast(void, (i)) |
|
#define cast_byte(i) cast(lu_byte, (i)) |
|
#define cast_num(i) cast(lua_Number, (i)) |
|
#define cast_int(i) cast(int, (i)) |
|
#define cast_uchar(i) cast(unsigned char, (i)) |
|
|
|
|
|
/* cast a signed lua_Integer to lua_Unsigned */ |
|
#if !defined(l_castS2U) |
|
#define l_castS2U(i) ((lua_Unsigned)(i)) |
|
#endif |
|
|
|
/* |
|
** cast a lua_Unsigned to a signed lua_Integer; this cast is |
|
** not strict ISO C, but two-complement architectures should |
|
** work fine. |
|
*/ |
|
#if !defined(l_castU2S) |
|
#define l_castU2S(i) ((lua_Integer)(i)) |
|
#endif |
|
|
|
|
|
/* |
|
** non-return type |
|
*/ |
|
#if defined(__GNUC__) |
|
#define l_noret void __attribute__((noreturn)) |
|
#elif defined(_MSC_VER) && _MSC_VER >= 1200 |
|
#define l_noret void __declspec(noreturn) |
|
#else |
|
#define l_noret void |
|
#endif |
|
|
|
|
|
|
|
/* |
|
** maximum depth for nested C calls and syntactical nested non-terminals |
|
** in a program. (Value must fit in an unsigned short int.) |
|
*/ |
|
#if !defined(LUAI_MAXCCALLS) |
|
#define LUAI_MAXCCALLS 200 |
|
#endif |
|
|
|
|
|
|
|
/* |
|
** type for virtual-machine instructions; |
|
** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h) |
|
*/ |
|
#if LUAI_BITSINT >= 32 |
|
typedef unsigned int Instruction; |
|
#else |
|
typedef unsigned long Instruction; |
|
#endif |
|
|
|
|
|
|
|
/* |
|
** Maximum length for short strings, that is, strings that are |
|
** internalized. (Cannot be smaller than reserved words or tags for |
|
** metamethods, as these strings must be internalized; |
|
** #("function") = 8, #("__newindex") = 10.) |
|
*/ |
|
#if !defined(LUAI_MAXSHORTLEN) |
|
#define LUAI_MAXSHORTLEN 40 |
|
#endif |
|
|
|
|
|
/* |
|
** Initial size for the string table (must be power of 2). |
|
** The Lua core alone registers ~50 strings (reserved words + |
|
** metaevent keys + a few others). Libraries would typically add |
|
** a few dozens more. |
|
*/ |
|
#if !defined(MINSTRTABSIZE) |
|
#define MINSTRTABSIZE 128 |
|
#endif |
|
|
|
|
|
/* |
|
** Size of cache for strings in the API. 'N' is the number of |
|
** sets (better be a prime) and "M" is the size of each set (M == 1 |
|
** makes a direct cache.) |
|
*/ |
|
#if !defined(STRCACHE_N) |
|
#define STRCACHE_N 53 |
|
#define STRCACHE_M 2 |
|
#endif |
|
|
|
|
|
/* minimum size for string buffer */ |
|
#if !defined(LUA_MINBUFFER) |
|
#define LUA_MINBUFFER 32 |
|
#endif |
|
|
|
|
|
/* |
|
** macros that are executed whenever program enters the Lua core |
|
** ('lua_lock') and leaves the core ('lua_unlock') |
|
*/ |
|
#if !defined(lua_lock) |
|
#define lua_lock(L) ((void) 0) |
|
#define lua_unlock(L) ((void) 0) |
|
#endif |
|
|
|
/* |
|
** macro executed during Lua functions at points where the |
|
** function can yield. |
|
*/ |
|
#if !defined(luai_threadyield) |
|
#define luai_threadyield(L) {lua_unlock(L); lua_lock(L);} |
|
#endif |
|
|
|
|
|
/* |
|
** these macros allow user-specific actions on threads when you defined |
|
** LUAI_EXTRASPACE and need to do something extra when a thread is |
|
** created/deleted/resumed/yielded. |
|
*/ |
|
#if !defined(luai_userstateopen) |
|
#define luai_userstateopen(L) ((void)L) |
|
#endif |
|
|
|
#if !defined(luai_userstateclose) |
|
#define luai_userstateclose(L) ((void)L) |
|
#endif |
|
|
|
#if !defined(luai_userstatethread) |
|
#define luai_userstatethread(L,L1) ((void)L) |
|
#endif |
|
|
|
#if !defined(luai_userstatefree) |
|
#define luai_userstatefree(L,L1) ((void)L) |
|
#endif |
|
|
|
#if !defined(luai_userstateresume) |
|
#define luai_userstateresume(L,n) ((void)L) |
|
#endif |
|
|
|
#if !defined(luai_userstateyield) |
|
#define luai_userstateyield(L,n) ((void)L) |
|
#endif |
|
|
|
|
|
|
|
/* |
|
** The luai_num* macros define the primitive operations over numbers. |
|
*/ |
|
|
|
/* floor division (defined as 'floor(a/b)') */ |
|
#if !defined(luai_numidiv) |
|
#define luai_numidiv(L,a,b) ((void)L, l_floor(luai_numdiv(L,a,b))) |
|
#endif |
|
|
|
/* float division */ |
|
#if !defined(luai_numdiv) |
|
#define luai_numdiv(L,a,b) ((a)/(b)) |
|
#endif |
|
|
|
/* |
|
** modulo: defined as 'a - floor(a/b)*b'; this definition gives NaN when |
|
** 'b' is huge, but the result should be 'a'. 'fmod' gives the result of |
|
** 'a - trunc(a/b)*b', and therefore must be corrected when 'trunc(a/b) |
|
** ~= floor(a/b)'. That happens when the division has a non-integer |
|
** negative result, which is equivalent to the test below. |
|
*/ |
|
#if !defined(luai_nummod) |
|
#define luai_nummod(L,a,b,m) \ |
|
{ (m) = l_mathop(fmod)(a,b); if ((m)*(b) < 0) (m) += (b); } |
|
#endif |
|
|
|
/* exponentiation */ |
|
#if !defined(luai_numpow) |
|
#define luai_numpow(L,a,b) ((void)L, l_mathop(pow)(a,b)) |
|
#endif |
|
|
|
/* the others are quite standard operations */ |
|
#if !defined(luai_numadd) |
|
#define luai_numadd(L,a,b) ((a)+(b)) |
|
#define luai_numsub(L,a,b) ((a)-(b)) |
|
#define luai_nummul(L,a,b) ((a)*(b)) |
|
#define luai_numunm(L,a) (-(a)) |
|
#define luai_numeq(a,b) ((a)==(b)) |
|
#define luai_numlt(a,b) ((a)<(b)) |
|
#define luai_numle(a,b) ((a)<=(b)) |
|
#define luai_numisnan(a) (!luai_numeq((a), (a))) |
|
#endif |
|
|
|
|
|
|
|
|
|
|
|
/* |
|
** macro to control inclusion of some hard tests on stack reallocation |
|
*/ |
|
#if !defined(HARDSTACKTESTS) |
|
#define condmovestack(L,pre,pos) ((void)0) |
|
#else |
|
/* realloc stack keeping its size */ |
|
#define condmovestack(L,pre,pos) \ |
|
{ int sz_ = (L)->stacksize; pre; luaD_reallocstack((L), sz_); pos; } |
|
#endif |
|
|
|
#if !defined(HARDMEMTESTS) |
|
#define condchangemem(L,pre,pos) ((void)0) |
|
#else |
|
#define condchangemem(L,pre,pos) \ |
|
{ if (G(L)->gcrunning) { pre; luaC_fullgc(L, 0); pos; } } |
|
#endif |
|
|
|
#endif
|
|
|