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# lua/llimits.h

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    00001 /*
    00002 ** $Id: llimits.h,v 1.69 2005/12/27 17:12:00 roberto Exp $
    00003 ** Limits, basic types, and some other `installation-dependent' definitions
    00004 ** See Copyright Notice in lua.h
    00005 */
    00006
    00007 #ifndef llimits_h
    00008 #define llimits_h
    00009
    00010
    00011 #include <limits.h>
    00012 #include <stddef.h>
    00013
    00014
    00015 #include "lua.h"
    00016
    00017
    00018 typedef LUAI_UINT32 lu_int32;
    00019
    00020 typedef LUAI_UMEM lu_mem;
    00021
    00022 typedef LUAI_MEM l_mem;
    00023
    00024
    00025
    00026 /* chars used as small naturals (so that `char' is reserved for characters) */
    00027 typedef unsigned char lu_byte;
    00028
    00029
    00030 #define MAX_SIZET       ((size_t)(~(size_t)0)-2)
    00031
    00032 #define MAX_LUMEM       ((lu_mem)(~(lu_mem)0)-2)
    00033
    00034
    00035 #define MAX_INT (INT_MAX-2)  /* maximum value of an int (-2 for safety) */
    00036
    00037 /*
    00038 ** conversion of pointer to integer
    00039 ** this is for hashing only; there is no problem if the integer
    00040 ** cannot hold the whole pointer value
    00041 */
    00042 #define IntPoint(p)  ((unsigned int)(lu_mem)(p))
    00043
    00044
    00045
    00046 /* type to ensure maximum alignment */
    00047 typedef LUAI_USER_ALIGNMENT_T L_Umaxalign;
    00048
    00049
    00050 /* result of a `usual argument conversion' over lua_Number */
    00051 typedef LUAI_UACNUMBER l_uacNumber;
    00052
    00053
    00054 /* internal assertions for in-house debugging */
    00055 #ifdef lua_assert
    00056
    00057 #define check_exp(c,e)          (lua_assert(c), (e))
    00058 #define api_check(l,e)          lua_assert(e)
    00059
    00060 #else
    00061
    00062 #define lua_assert(c)           ((void)0)
    00063 #define check_exp(c,e)          (e)
    00064 #define api_check               luai_apicheck
    00065
    00066 #endif
    00067
    00068
    00069 #ifndef UNUSED
    00070 #define UNUSED(x)       ((void)(x))     /* to avoid warnings */
    00071 #endif
    00072
    00073
    00074 #ifndef cast
    00075 #define cast(t, exp)    ((t)(exp))
    00076 #endif
    00077
    00078 #define cast_byte(i)    cast(lu_byte, (i))
    00079 #define cast_num(i)     cast(lua_Number, (i))
    00080 #define cast_int(i)     cast(int, (i))
    00081
    00082
    00083
    00084 /*
    00085 ** type for virtual-machine instructions
    00086 ** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)
    00087 */
    00088 typedef lu_int32 Instruction;
    00089
    00090
    00091
    00092 /* maximum stack for a Lua function */
    00093 #define MAXSTACK        250
    00094
    00095
    00096
    00097 /* minimum size for the string table (must be power of 2) */
    00098 #ifndef MINSTRTABSIZE
    00099 #define MINSTRTABSIZE   32
    00100 #endif
    00101
    00102
    00103 /* minimum size for string buffer */
    00104 #ifndef LUA_MINBUFFER
    00105 #define LUA_MINBUFFER   32
    00106 #endif
    00107
    00108
    00109 #ifndef lua_lock
    00110 #define lua_lock(L)     ((void) 0)
    00111 #define lua_unlock(L)   ((void) 0)
    00112 #endif
    00113
    00114 #ifndef luai_threadyield
    00115 #define luai_threadyield(L)     {lua_unlock(L); lua_lock(L);}
    00116 #endif
    00117
    00118
    00119 /*
    00120 ** macro to control inclusion of some hard tests on stack reallocation
    00121 */
    00122 #ifndef HARDSTACKTESTS
    00123 #define condhardstacktests(x)   ((void)0)
    00124 #else
    00125 #define condhardstacktests(x)   x
    00126 #endif
    00127
    00128 #endif