src/llimits.h

   1 /*
   2 ** $Id: llimits.h,v 1.69.1.1 2007/12/27 13:02:25 roberto Exp $
   3 ** Limits, basic types, and some other `installation-dependent' definitions
   4 ** See Copyright Notice in lua.h
   5 */
   6
   7 #ifndef llimits_h
   8 #define llimits_h
   9
  10
  11 #include <limits.h>
  12 #include <stddef.h>
  13
  14
  15 #include "lua.h"
  16
  17
  18 typedef LUAI_UINT32 lu_int32;
  19
  20 typedef LUAI_UMEM lu_mem;
  21
  22 typedef LUAI_MEM l_mem;
  23
  24
  25
  26 /* chars used as small naturals (so that `char' is reserved for characters) */
  27 typedef unsigned char lu_byte;
  28
  29
  30 #define MAX_SIZET       ((size_t)(~(size_t)0)-2)
  31
  32 #define MAX_LUMEM       ((lu_mem)(~(lu_mem)0)-2)
  33
  34
  35 #define MAX_INT (INT_MAX-2)  /* maximum value of an int (-2 for safety) */
  36
  37 /*
  38 ** conversion of pointer to integer
  39 ** this is for hashing only; there is no problem if the integer
  40 ** cannot hold the whole pointer value
  41 */
  42 #define IntPoint(p)  ((unsigned int)(lu_mem)(p))
  43
  44
  45
  46 /* type to ensure maximum alignment */
  47 typedef LUAI_USER_ALIGNMENT_T L_Umaxalign;
  48
  49
  50 /* result of a `usual argument conversion' over lua_Number */
  51 typedef LUAI_UACNUMBER l_uacNumber;
  52
  53
  54 /* internal assertions for in-house debugging */
  55 #ifdef lua_assert
  56
  57 #define check_exp(c,e)          (lua_assert(c), (e))
  58 #define api_check(l,e)          lua_assert(e)
  59
  60 #else
  61
  62 #define lua_assert(c)           ((void)0)
  63 #define check_exp(c,e)          (e)
  64 #define api_check               luai_apicheck
  65
  66 #endif
  67
  68
  69 #ifndef UNUSED
  70 #define UNUSED(x)       ((void)(x))     /* to avoid warnings */
  71 #endif
  72
  73
  74 #ifndef cast
  75 #define cast(t, exp)    ((t)(exp))
  76 #endif
  77
  78 #define cast_byte(i)    cast(lu_byte, (i))
  79 #define cast_num(i)     cast(lua_Number, (i))
  80 #define cast_int(i)     cast(int, (i))
  81
  82
  83
  84 /*
  85 ** type for virtual-machine instructions
  86 ** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)
  87 */
  88 typedef lu_int32 Instruction;
  89
  90
  91
  92 /* maximum stack for a Lua function */
  93 #define MAXSTACK        250
  94
  95
  96
  97 /* minimum size for the string table (must be power of 2) */
  98 #ifndef MINSTRTABSIZE
  99 #define MINSTRTABSIZE   32
 100 #endif
 101
 102
 103 /* minimum size for string buffer */
 104 #ifndef LUA_MINBUFFER
 105 #define LUA_MINBUFFER   32
 106 #endif
 107
 108
 109 #ifndef lua_lock
 110 #define lua_lock(L)     ((void) 0)
 111 #define lua_unlock(L)   ((void) 0)
 112 #endif
 113
 114 #ifndef luai_threadyield
 115 #define luai_threadyield(L)     {lua_unlock(L); lua_lock(L);}
 116 #endif
 117
 118
 119 /*
 120 ** macro to control inclusion of some hard tests on stack reallocation
 121 */
 122 #ifndef HARDSTACKTESTS
 123 #define condhardstacktests(x)   ((void)0)
 124 #else
 125 #define condhardstacktests(x)   x
 126 #endif
 127
 128 #endif