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comparison lib/lua/lua-5.2.2/llimits.h @ 1866:41cc4dd3c122

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Lua 5.2.2 added.
author Nomad
date Wed, 16 Oct 2013 13:34:26 +0200
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1848:3b39b70e8e93 1866:41cc4dd3c122
1 /*
2 ** $Id: llimits.h,v 1.103 2013/02/20 14:08:56 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 unsigned LUA_INT32 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 #define MAX_LMEM ((l_mem) ((MAX_LUMEM >> 1) - 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 #if !defined(LUAI_USER_ALIGNMENT_T)
50 #define LUAI_USER_ALIGNMENT_T union { double u; void *s; long l; }
51 #endif
52
53 typedef LUAI_USER_ALIGNMENT_T L_Umaxalign;
54
55
56 /* result of a `usual argument conversion' over lua_Number */
57 typedef LUAI_UACNUMBER l_uacNumber;
58
59
60 /* internal assertions for in-house debugging */
61 #if defined(lua_assert)
62 #define check_exp(c,e) (lua_assert(c), (e))
63 /* to avoid problems with conditions too long */
64 #define lua_longassert(c) { if (!(c)) lua_assert(0); }
65 #else
66 #define lua_assert(c) ((void)0)
67 #define check_exp(c,e) (e)
68 #define lua_longassert(c) ((void)0)
69 #endif
70
71 /*
72 ** assertion for checking API calls
73 */
74 #if !defined(luai_apicheck)
75
76 #if defined(LUA_USE_APICHECK)
77 #include <assert.h>
78 #define luai_apicheck(L,e) assert(e)
79 #else
80 #define luai_apicheck(L,e) lua_assert(e)
81 #endif
82
83 #endif
84
85 #define api_check(l,e,msg) luai_apicheck(l,(e) && msg)
86
87
88 #if !defined(UNUSED)
89 #define UNUSED(x) ((void)(x)) /* to avoid warnings */
90 #endif
91
92
93 #define cast(t, exp) ((t)(exp))
94
95 #define cast_byte(i) cast(lu_byte, (i))
96 #define cast_num(i) cast(lua_Number, (i))
97 #define cast_int(i) cast(int, (i))
98 #define cast_uchar(i) cast(unsigned char, (i))
99
100
101 /*
102 ** non-return type
103 */
104 #if defined(__GNUC__)
105 #define l_noret void __attribute__((noreturn))
106 #elif defined(_MSC_VER)
107 #define l_noret void __declspec(noreturn)
108 #else
109 #define l_noret void
110 #endif
111
112
113
114 /*
115 ** maximum depth for nested C calls and syntactical nested non-terminals
116 ** in a program. (Value must fit in an unsigned short int.)
117 */
118 #if !defined(LUAI_MAXCCALLS)
119 #define LUAI_MAXCCALLS 200
120 #endif
121
122 /*
123 ** maximum number of upvalues in a closure (both C and Lua). (Value
124 ** must fit in an unsigned char.)
125 */
126 #define MAXUPVAL UCHAR_MAX
127
128
129 /*
130 ** type for virtual-machine instructions
131 ** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)
132 */
133 typedef lu_int32 Instruction;
134
135
136
137 /* maximum stack for a Lua function */
138 #define MAXSTACK 250
139
140
141
142 /* minimum size for the string table (must be power of 2) */
143 #if !defined(MINSTRTABSIZE)
144 #define MINSTRTABSIZE 32
145 #endif
146
147
148 /* minimum size for string buffer */
149 #if !defined(LUA_MINBUFFER)
150 #define LUA_MINBUFFER 32
151 #endif
152
153
154 #if !defined(lua_lock)
155 #define lua_lock(L) ((void) 0)
156 #define lua_unlock(L) ((void) 0)
157 #endif
158
159 #if !defined(luai_threadyield)
160 #define luai_threadyield(L) {lua_unlock(L); lua_lock(L);}
161 #endif
162
163
164 /*
165 ** these macros allow user-specific actions on threads when you defined
166 ** LUAI_EXTRASPACE and need to do something extra when a thread is
167 ** created/deleted/resumed/yielded.
168 */
169 #if !defined(luai_userstateopen)
170 #define luai_userstateopen(L) ((void)L)
171 #endif
172
173 #if !defined(luai_userstateclose)
174 #define luai_userstateclose(L) ((void)L)
175 #endif
176
177 #if !defined(luai_userstatethread)
178 #define luai_userstatethread(L,L1) ((void)L)
179 #endif
180
181 #if !defined(luai_userstatefree)
182 #define luai_userstatefree(L,L1) ((void)L)
183 #endif
184
185 #if !defined(luai_userstateresume)
186 #define luai_userstateresume(L,n) ((void)L)
187 #endif
188
189 #if !defined(luai_userstateyield)
190 #define luai_userstateyield(L,n) ((void)L)
191 #endif
192
193 /*
194 ** lua_number2int is a macro to convert lua_Number to int.
195 ** lua_number2integer is a macro to convert lua_Number to lua_Integer.
196 ** lua_number2unsigned is a macro to convert a lua_Number to a lua_Unsigned.
197 ** lua_unsigned2number is a macro to convert a lua_Unsigned to a lua_Number.
198 ** luai_hashnum is a macro to hash a lua_Number value into an integer.
199 ** The hash must be deterministic and give reasonable values for
200 ** both small and large values (outside the range of integers).
201 */
202
203 #if defined(MS_ASMTRICK) || defined(LUA_MSASMTRICK) /* { */
204 /* trick with Microsoft assembler for X86 */
205
206 #define lua_number2int(i,n) __asm {__asm fld n __asm fistp i}
207 #define lua_number2integer(i,n) lua_number2int(i, n)
208 #define lua_number2unsigned(i,n) \
209 {__int64 l; __asm {__asm fld n __asm fistp l} i = (unsigned int)l;}
210
211
212 #elif defined(LUA_IEEE754TRICK) /* }{ */
213 /* the next trick should work on any machine using IEEE754 with
214 a 32-bit int type */
215
216 union luai_Cast { double l_d; LUA_INT32 l_p[2]; };
217
218 #if !defined(LUA_IEEEENDIAN) /* { */
219 #define LUAI_EXTRAIEEE \
220 static const union luai_Cast ieeeendian = {-(33.0 + 6755399441055744.0)};
221 #define LUA_IEEEENDIANLOC (ieeeendian.l_p[1] == 33)
222 #else
223 #define LUA_IEEEENDIANLOC LUA_IEEEENDIAN
224 #define LUAI_EXTRAIEEE /* empty */
225 #endif /* } */
226
227 #define lua_number2int32(i,n,t) \
228 { LUAI_EXTRAIEEE \
229 volatile union luai_Cast u; u.l_d = (n) + 6755399441055744.0; \
230 (i) = (t)u.l_p[LUA_IEEEENDIANLOC]; }
231
232 #define luai_hashnum(i,n) \
233 { volatile union luai_Cast u; u.l_d = (n) + 1.0; /* avoid -0 */ \
234 (i) = u.l_p[0]; (i) += u.l_p[1]; } /* add double bits for his hash */
235
236 #define lua_number2int(i,n) lua_number2int32(i, n, int)
237 #define lua_number2unsigned(i,n) lua_number2int32(i, n, lua_Unsigned)
238
239 /* the trick can be expanded to lua_Integer when it is a 32-bit value */
240 #if defined(LUA_IEEELL)
241 #define lua_number2integer(i,n) lua_number2int32(i, n, lua_Integer)
242 #endif
243
244 #endif /* } */
245
246
247 /* the following definitions always work, but may be slow */
248
249 #if !defined(lua_number2int)
250 #define lua_number2int(i,n) ((i)=(int)(n))
251 #endif
252
253 #if !defined(lua_number2integer)
254 #define lua_number2integer(i,n) ((i)=(lua_Integer)(n))
255 #endif
256
257 #if !defined(lua_number2unsigned) /* { */
258 /* the following definition assures proper modulo behavior */
259 #if defined(LUA_NUMBER_DOUBLE) || defined(LUA_NUMBER_FLOAT)
260 #include <math.h>
261 #define SUPUNSIGNED ((lua_Number)(~(lua_Unsigned)0) + 1)
262 #define lua_number2unsigned(i,n) \
263 ((i)=(lua_Unsigned)((n) - floor((n)/SUPUNSIGNED)*SUPUNSIGNED))
264 #else
265 #define lua_number2unsigned(i,n) ((i)=(lua_Unsigned)(n))
266 #endif
267 #endif /* } */
268
269
270 #if !defined(lua_unsigned2number)
271 /* on several machines, coercion from unsigned to double is slow,
272 so it may be worth to avoid */
273 #define lua_unsigned2number(u) \
274 (((u) <= (lua_Unsigned)INT_MAX) ? (lua_Number)(int)(u) : (lua_Number)(u))
275 #endif
276
277
278
279 #if defined(ltable_c) && !defined(luai_hashnum)
280
281 #include <float.h>
282 #include <math.h>
283
284 #define luai_hashnum(i,n) { int e; \
285 n = l_mathop(frexp)(n, &e) * (lua_Number)(INT_MAX - DBL_MAX_EXP); \
286 lua_number2int(i, n); i += e; }
287
288 #endif
289
290
291
292 /*
293 ** macro to control inclusion of some hard tests on stack reallocation
294 */
295 #if !defined(HARDSTACKTESTS)
296 #define condmovestack(L) ((void)0)
297 #else
298 /* realloc stack keeping its size */
299 #define condmovestack(L) luaD_reallocstack((L), (L)->stacksize)
300 #endif
301
302 #if !defined(HARDMEMTESTS)
303 #define condchangemem(L) condmovestack(L)
304 #else
305 #define condchangemem(L) \
306 ((void)(!(G(L)->gcrunning) || (luaC_fullgc(L, 0), 1)))
307 #endif
308
309 #endif