Lua 5.1.4: llimits.h

L0001 /*
L0002 ** $Id: llimits.h,v 1.69.1.1 2007年12月27日 13:02:25 roberto Exp $
L0003 ** Limits, basic types, and some other `installation-dependent' definitions
L0004 ** See Copyright Notice in lua.h
L0005 */
L0006 
L0007 #ifndef llimits_h
L0008 #define llimits_h
L0009 
L0010 
L0011 #include <limits.h>
L0012 #include <stddef.h>
L0013 
L0014 
L0015 #include "lua.h"
 L0016 
L0017 
L0018 typedef LUAI_UINT32 lu_int32;
L0019 
L0020 typedef LUAI_UMEM lu_mem;
L0021 
L0022 typedef LUAI_MEM l_mem;
L0023 
L0024 
L0025 
L0026 /* chars used as small naturals (so that `char' is reserved for characters) */
L0027 typedef unsigned char lu_byte;
L0028 
L0029 
L0030 #define MAX_SIZET	((size_t)(~(size_t)0)-2)
L0031 
L0032 #define MAX_LUMEM	((lu_mem)(~(lu_mem)0)-2)
L0033 
L0034 
L0035 #define MAX_INT (INT_MAX-2) /* maximum value of an int (-2 for safety) */
L0036 
L0037 /*
L0038 ** conversion of pointer to integer
L0039 ** this is for hashing only; there is no problem if the integer
L0040 ** cannot hold the whole pointer value
L0041 */
L0042 #define IntPoint(p) ((unsigned int)(lu_mem)(p))
L0043 
L0044 
L0045 
L0046 /* type to ensure maximum alignment */
L0047 typedef LUAI_USER_ALIGNMENT_T L_Umaxalign;
L0048 
L0049 
L0050 /* result of a `usual argument conversion' over lua_Number */
L0051 typedef LUAI_UACNUMBER l_uacNumber;
L0052 
L0053 
L0054 /* internal assertions for in-house debugging */
L0055 #ifdef lua_assert
L0056 
L0057 #define check_exp(c,e)		(lua_assert(c), (e))
L0058 #define api_check(l,e)		lua_assert(e)
L0059 
L0060 #else
L0061 
L0062 #define lua_assert(c)		((void)0)
L0063 #define check_exp(c,e)		(e)
L0064 #define api_check		luai_apicheck
L0065 
L0066 #endif
L0067 
L0068 
L0069 #ifndef UNUSED
L0070 #define UNUSED(x)	((void)(x))	/* to avoid warnings */
L0071 #endif
L0072 
L0073 
L0074 #ifndef cast
L0075 #define cast(t, exp)	((t)(exp))
L0076 #endif
L0077 
L0078 #define cast_byte(i)	cast(lu_byte, (i))
L0079 #define cast_num(i)	cast(lua_Number, (i))
L0080 #define cast_int(i)	cast(int, (i))
L0081 
L0082 
L0083 
L0084 /*
L0085 ** type for virtual-machine instructions
L0086 ** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)
L0087 */
L0088 typedef lu_int32 Instruction;
L0089 
L0090 
L0091 
L0092 /* maximum stack for a Lua function */
L0093 #define MAXSTACK	250
Note: must fix in byte (lu_byte)--see Proto::maxstacksize.
L0094 
L0095 
L0096 
L0097 /* minimum size for the string table (must be power of 2) */
L0098 #ifndef MINSTRTABSIZE
L0099 #define MINSTRTABSIZE	32
L0100 #endif
L0101 
L0102 
L0103 /* minimum size for string buffer */
L0104 #ifndef LUA_MINBUFFER
L0105 #define LUA_MINBUFFER	32
L0106 #endif
L0107 
L0108 
L0109 #ifndef lua_lock
L0110 #define lua_lock(L) ((void) 0) 
L0111 #define lua_unlock(L) ((void) 0)
L0112 #endif
L0113 
L0114 #ifndef luai_threadyield
L0115 #define luai_threadyield(L) {lua_unlock(L); lua_lock(L);}
L0116 #endif
L0117 
L0118 
L0119 /*
L0120 ** macro to control inclusion of some hard tests on stack reallocation
L0121 */ 
L0122 #ifndef HARDSTACKTESTS
L0123 #define condhardstacktests(x)	((void)0)
L0124 #else
L0125 #define condhardstacktests(x)	x
L0126 #endif
L0127 
L0128 #endif