mirror of
https://github.com/lua/lua.git
synced 2024-11-27 20:23:55 +08:00
3cf1729a02
a stringfication of the condition, to avoid too long string literals (limited by C90 to ~510 characters)
287 lines
7.0 KiB
C
287 lines
7.0 KiB
C
/*
|
|
** $Id: llimits.h,v 1.88 2011/02/28 17:32:10 roberto Exp roberto $
|
|
** 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 unsigned LUA_INT32 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 MIN_LMEM ((l_mem)~((~(lu_mem)0)>>1))
|
|
|
|
|
|
#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 */
|
|
#if !defined(LUAI_USER_ALIGNMENT_T)
|
|
#define LUAI_USER_ALIGNMENT_T union { double u; void *s; long l; }
|
|
#endif
|
|
|
|
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 */
|
|
#if defined(lua_assert)
|
|
#define check_exp(c,e) (lua_assert(c), (e))
|
|
/* to avoid problems with conditions too long */
|
|
#define lua_longassert(c) { if (!(c)) lua_assert(0); }
|
|
#else
|
|
#define lua_assert(c) /* empty */
|
|
#define check_exp(c,e) (e)
|
|
#define lua_longassert(c) /* empty */
|
|
#endif
|
|
|
|
/*
|
|
** assertion for checking API calls
|
|
*/
|
|
#if defined(LUA_USE_APICHECK)
|
|
#include <assert.h>
|
|
#define luai_apicheck(L,e) { (void)L; assert(e); }
|
|
#elif !defined(luai_apicheck)
|
|
#define luai_apicheck(L,e) lua_assert(e)
|
|
#endif
|
|
|
|
#define api_check(l,e,msg) luai_apicheck(l,(e) && msg)
|
|
|
|
|
|
#if !defined(UNUSED)
|
|
#define UNUSED(x) ((void)(x)) /* to avoid warnings */
|
|
#endif
|
|
|
|
|
|
#define cast(t, exp) ((t)(exp))
|
|
|
|
#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))
|
|
|
|
|
|
/*
|
|
** 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
|
|
|
|
/*
|
|
** maximum number of upvalues in a closure (both C and Lua). (Value
|
|
** must fit in an unsigned char.)
|
|
*/
|
|
#define MAXUPVAL UCHAR_MAX
|
|
|
|
|
|
/*
|
|
** 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) */
|
|
#if !defined(MINSTRTABSIZE)
|
|
#define MINSTRTABSIZE 32
|
|
#endif
|
|
|
|
|
|
/* minimum size for string buffer */
|
|
#if !defined(LUA_MINBUFFER)
|
|
#define LUA_MINBUFFER 32
|
|
#endif
|
|
|
|
|
|
#if !defined(lua_lock)
|
|
#define lua_lock(L) ((void) 0)
|
|
#define lua_unlock(L) ((void) 0)
|
|
#endif
|
|
|
|
#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
|
|
|
|
/*
|
|
** lua_number2int is a macro to convert lua_Number to int.
|
|
** lua_number2integer is a macro to convert lua_Number to lua_Integer.
|
|
** lua_number2unsigned is a macro to convert a lua_Number to a lua_Unsigned.
|
|
** lua_unsigned2number is a macro to convert a lua_Unsigned to a lua_Number.
|
|
** luai_hashnum is a macro to hash a lua_Number value into an integer.
|
|
** The hash must be deterministic and give reasonable values for
|
|
** both small and large values (outside the range of integers).
|
|
*/
|
|
|
|
#if defined(MS_ASMTRICK) /* { */
|
|
/* trick with Microsoft assembler for X86 */
|
|
|
|
#define lua_number2int(i,n) __asm {__asm fld n __asm fistp i}
|
|
#define lua_number2integer(i,n) lua_number2int(i, n)
|
|
#define lua_number2unsigned(i,n) \
|
|
{__int64 l; __asm {__asm fld n __asm fistp l} i = (unsigned int)l;}
|
|
|
|
|
|
#elif defined(LUA_IEEE754TRICK) /* }{ */
|
|
/* the next trick should work on any machine using IEEE754 with
|
|
a 32-bit integer type */
|
|
|
|
union luai_Cast { double l_d; LUA_INT32 l_p[2]; };
|
|
|
|
#if !defined(LUA_IEEEENDIAN) /* { */
|
|
#define LUAI_EXTRAIEEE \
|
|
static const union luai_Cast ieeeendian = {-(33.0 + 6755399441055744.0)};
|
|
#define LUA_IEEEENDIAN (ieeeendian.l_p[1] == 33)
|
|
#else
|
|
#define LUAI_EXTRAIEEE /* empty */
|
|
#endif /* } */
|
|
|
|
#define lua_number2int32(i,n,t) \
|
|
{ LUAI_EXTRAIEEE \
|
|
volatile union luai_Cast u; u.l_d = (n) + 6755399441055744.0; \
|
|
(i) = (t)u.l_p[LUA_IEEEENDIAN]; }
|
|
|
|
#define luai_hashnum(i,n) \
|
|
{ volatile union luai_Cast u; u.l_d = (n) + 1.0; /* avoid -0 */ \
|
|
(i) = u.l_p[0] + u.l_p[1]; } /* add double bits for his hash */
|
|
|
|
#define lua_number2int(i,n) lua_number2int32(i, n, int)
|
|
#define lua_number2integer(i,n) lua_number2int32(i, n, lua_Integer)
|
|
#define lua_number2unsigned(i,n) lua_number2int32(i, n, lua_Unsigned)
|
|
|
|
#endif /* } */
|
|
|
|
|
|
/* the following definitions always work, but may be slow */
|
|
|
|
#if !defined(lua_number2int)
|
|
#define lua_number2int(i,n) ((i)=(int)(n))
|
|
#endif
|
|
|
|
#if !defined(lua_number2integer)
|
|
#define lua_number2integer(i,n) ((i)=(lua_Integer)(n))
|
|
#endif
|
|
|
|
#if !defined(lua_number2unsigned) /* { */
|
|
/* the following definition assures proper modulo behavior */
|
|
#if defined(LUA_NUMBER_DOUBLE)
|
|
#include <math.h>
|
|
#define SUPUNSIGNED ((lua_Number)(~(lua_Unsigned)0) + 1)
|
|
#define lua_number2unsigned(i,n) \
|
|
((i)=(lua_Unsigned)((n) - floor((n)/SUPUNSIGNED)*SUPUNSIGNED))
|
|
#else
|
|
#define lua_number2unsigned(i,n) ((i)=(lua_Unsigned)(n))
|
|
#endif
|
|
#endif /* } */
|
|
|
|
|
|
#if !defined(lua_unsigned2number)
|
|
/* on several machines, coercion from unsigned to double is slow,
|
|
so it may be worth to avoid */
|
|
#define lua_unsigned2number(u) \
|
|
(((u) <= (lua_Unsigned)INT_MAX) ? (lua_Number)(int)(u) : (lua_Number)(u))
|
|
#endif
|
|
|
|
|
|
|
|
#if (defined(ltable_c) || defined(luaall_c)) && !defined(luai_hashnum)
|
|
|
|
#include <float.h>
|
|
#include <math.h>
|
|
|
|
#define luai_hashnum(i,n) { int e; \
|
|
n = frexp(n, &e) * (lua_Number)(INT_MAX - DBL_MAX_EXP); \
|
|
lua_number2int(i, n); i += e; }
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/*
|
|
** macro to control inclusion of some hard tests on stack reallocation
|
|
*/
|
|
#if !defined(HARDSTACKTESTS)
|
|
#define condmovestack(L) ((void)0)
|
|
#else
|
|
/* realloc stack keeping its size */
|
|
#define condmovestack(L) luaD_reallocstack((L), (L)->stacksize)
|
|
#endif
|
|
|
|
#if !defined(HARDMEMTESTS)
|
|
#define condchangemem(L) condmovestack(L)
|
|
#else
|
|
#define condchangemem(L) \
|
|
((void)(!(G(L)->gcrunning) || (luaC_fullgc(L, 0), 1)))
|
|
#endif
|
|
|
|
#endif
|