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1/*
2** $Id: llimits.h,v 1.69 2005/12/27 17:12:00 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
18typedef LUAI_UINT32 lu_int32;
19
20typedef LUAI_UMEM lu_mem;
21
22typedef LUAI_MEM l_mem;
23
24
25
26/* chars used as small naturals (so that `char' is reserved for characters) */
27typedef 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 */
47typedef LUAI_USER_ALIGNMENT_T L_Umaxalign;
48
49
50/* result of a `usual argument conversion' over lua_Number */
51typedef 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_checkluai_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*/
88typedef lu_int32 Instruction;
89
90
91
92/* maximum stack for a Lua function */
93#define MAXSTACK250
94
95
96
97/* minimum size for the string table (must be power of 2) */
98#ifndef MINSTRTABSIZE
99#define MINSTRTABSIZE32
100#endif
101
102
103/* minimum size for string buffer */
104#ifndef LUA_MINBUFFER
105#define LUA_MINBUFFER32
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

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