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