external/mit/lua/dist/src/llimits.h

   1 /*      $NetBSD: llimits.h,v 1.1.1.2 2012/03/15 00:08:12 alnsn Exp $    */
   2
   3 /*
   4 ** $Id: llimits.h,v 1.1.1.2 2012/03/15 00:08:12 alnsn Exp $
   5 ** Limits, basic types, and some other `installation-dependent' definitions
   6 ** See Copyright Notice in lua.h
   7 */
   8
   9 #ifndef llimits_h
  10 #define llimits_h
  11
  12
  13 #include <limits.h>
  14 #include <stddef.h>
  15
  16
  17 #include "lua.h"
  18
  19
  20 typedef LUAI_UINT32 lu_int32;
  21
  22 typedef LUAI_UMEM lu_mem;
  23
  24 typedef LUAI_MEM l_mem;
  25
  26
  27
  28 /* chars used as small naturals (so that `char' is reserved for characters) */
  29 typedef unsigned char lu_byte;
  30
  31
  32 #define MAX_SIZET       ((size_t)(~(size_t)0)-2)
  33
  34 #define MAX_LUMEM       ((lu_mem)(~(lu_mem)0)-2)
  35
  36
  37 #define MAX_INT (INT_MAX-2)  /* maximum value of an int (-2 for safety) */
  38
  39 /*
  40 ** conversion of pointer to integer
  41 ** this is for hashing only; there is no problem if the integer
  42 ** cannot hold the whole pointer value
  43 */
  44 #define IntPoint(p)  ((unsigned int)(lu_mem)(p))
  45
  46
  47
  48 /* type to ensure maximum alignment */
  49 typedef LUAI_USER_ALIGNMENT_T L_Umaxalign;
  50
  51
  52 /* result of a `usual argument conversion' over lua_Number */
  53 typedef LUAI_UACNUMBER l_uacNumber;
  54
  55
  56 /* internal assertions for in-house debugging */
  57 #ifdef lua_assert
  58
  59 #define check_exp(c,e)          (lua_assert(c), (e))
  60 #define api_check(l,e)          lua_assert(e)
  61
  62 #else
  63
  64 #define lua_assert(c)           ((void)0)
  65 #define check_exp(c,e)          (e)
  66 #define api_check               luai_apicheck
  67
  68 #endif
  69
  70
  71 #ifndef UNUSED
  72 #define UNUSED(x)       ((void)(x))     /* to avoid warnings */
  73 #endif
  74
  75
  76 #ifndef cast
  77 #define cast(t, exp)    ((t)(exp))
  78 #endif
  79
  80 #define cast_byte(i)    cast(lu_byte, (i))
  81 #define cast_num(i)     cast(lua_Number, (i))
  82 #define cast_int(i)     cast(int, (i))
  83
  84
  85
  86 /*
  87 ** type for virtual-machine instructions
  88 ** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)
  89 */
  90 typedef lu_int32 Instruction;
  91
  92
  93
  94 /* maximum stack for a Lua function */
  95 #define MAXSTACK        250
  96
  97
  98
  99 /* minimum size for the string table (must be power of 2) */
 100 #ifndef MINSTRTABSIZE
 101 #define MINSTRTABSIZE   32
 102 #endif
 103
 104
 105 /* minimum size for string buffer */
 106 #ifndef LUA_MINBUFFER
 107 #define LUA_MINBUFFER   32
 108 #endif
 109
 110
 111 #ifndef lua_lock
 112 #define lua_lock(L)     ((void) 0)
 113 #define lua_unlock(L)   ((void) 0)
 114 #endif
 115
 116 #ifndef luai_threadyield
 117 #define luai_threadyield(L)     {lua_unlock(L); lua_lock(L);}
 118 #endif
 119
 120
 121 /*
 122 ** macro to control inclusion of some hard tests on stack reallocation
 123 */
 124 #ifndef HARDSTACKTESTS
 125 #define condhardstacktests(x)   ((void)0)
 126 #else
 127 #define condhardstacktests(x)   x
 128 #endif
 129
 130 #endif