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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
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