1/* $NetBSD$ */ 2 3/* 4** Id: llimits.h,v 1.69.1.1 2007/12/27 13:02:25 roberto 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 20typedef LUAI_UINT32 lu_int32; 21 22typedef LUAI_UMEM lu_mem; 23 24typedef LUAI_MEM l_mem; 25 26 27 28/* chars used as small naturals (so that `char' is reserved for characters) */ 29typedef 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 */ 49typedef LUAI_USER_ALIGNMENT_T L_Umaxalign; 50 51 52/* result of a `usual argument conversion' over lua_Number */ 53typedef 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*/ 90typedef 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