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 131