llimits.h
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上传日期:2020-08-09
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文件大小:2k
- /*
- ** $Id: llimits.h,v 1.69 2005/12/27 17:12:00 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