]>
Commit | Line | Data |
---|---|---|
d99a0153 CW |
1 | /* |
2 | ** $Id: llimits.h,v 1.103.1.1 2013/04/12 18:48:47 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 <sys/lua/lua.h> | |
12 | ||
13 | ||
14 | typedef unsigned LUA_INT32 lu_int32; | |
15 | ||
16 | typedef LUAI_UMEM lu_mem; | |
17 | ||
18 | typedef LUAI_MEM l_mem; | |
19 | ||
20 | ||
21 | ||
22 | /* chars used as small naturals (so that `char' is reserved for characters) */ | |
23 | typedef unsigned char lu_byte; | |
24 | ||
25 | ||
26 | #define MAX_SIZET ((size_t)(~(size_t)0)-2) | |
27 | ||
28 | #define MAX_LUMEM ((lu_mem)(~(lu_mem)0)-2) | |
29 | ||
30 | #define MAX_LMEM ((l_mem) ((MAX_LUMEM >> 1) - 2)) | |
31 | ||
32 | ||
33 | #define MAX_INT (INT_MAX-2) /* maximum value of an int (-2 for safety) */ | |
34 | ||
35 | /* | |
36 | ** conversion of pointer to integer | |
37 | ** this is for hashing only; there is no problem if the integer | |
38 | ** cannot hold the whole pointer value | |
39 | */ | |
40 | #define IntPoint(p) ((unsigned int)(lu_mem)(p)) | |
41 | ||
42 | ||
43 | ||
44 | /* type to ensure maximum alignment */ | |
45 | #if !defined(LUAI_USER_ALIGNMENT_T) | |
46 | #define LUAI_USER_ALIGNMENT_T union { double u; void *s; long l; } | |
47 | #endif | |
48 | ||
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 | #if defined(lua_assert) | |
58 | #define check_exp(c,e) (lua_assert(c), (e)) | |
59 | /* to avoid problems with conditions too long */ | |
60 | #define lua_longassert(c) { if (!(c)) lua_assert(0); } | |
61 | #else | |
62 | #define lua_assert(c) ((void)0) | |
63 | #define check_exp(c,e) (e) | |
64 | #define lua_longassert(c) ((void)0) | |
65 | #endif | |
66 | ||
67 | /* | |
68 | ** assertion for checking API calls | |
69 | */ | |
70 | #if !defined(luai_apicheck) | |
71 | ||
72 | #if defined(LUA_USE_APICHECK) | |
73 | #include <assert.h> | |
74 | #define luai_apicheck(L,e) assert(e) | |
75 | #else | |
76 | #define luai_apicheck(L,e) lua_assert(e) | |
77 | #endif | |
78 | ||
79 | #endif | |
80 | ||
81 | #define api_check(l,e,msg) luai_apicheck(l,(e) && msg) | |
82 | ||
83 | ||
84 | #if !defined(UNUSED) | |
85 | #define UNUSED(x) ((void)(x)) /* to avoid warnings */ | |
86 | #endif | |
87 | ||
88 | ||
89 | #define cast(t, exp) ((t)(exp)) | |
90 | ||
91 | #define cast_byte(i) cast(lu_byte, (i)) | |
92 | #define cast_num(i) cast(lua_Number, (i)) | |
93 | #define cast_int(i) cast(int, (i)) | |
94 | #define cast_uchar(i) cast(unsigned char, (i)) | |
95 | ||
96 | ||
97 | /* | |
98 | ** non-return type | |
62d5c553 | 99 | ** |
9f5c1bc6 | 100 | ** Suppress noreturn attribute in kernel builds to avoid objtool check warnings |
d99a0153 | 101 | */ |
62d5c553 | 102 | #if defined(__GNUC__) && !defined(_KERNEL) |
d99a0153 CW |
103 | #define l_noret void __attribute__((noreturn)) |
104 | #elif defined(_MSC_VER) | |
105 | #define l_noret void __declspec(noreturn) | |
106 | #else | |
107 | #define l_noret void | |
108 | #endif | |
109 | ||
110 | ||
111 | ||
112 | /* | |
113 | ** maximum depth for nested C calls and syntactical nested non-terminals | |
114 | ** in a program. (Value must fit in an unsigned short int.) | |
115 | ** | |
116 | ** Note: On amd64 platform, the limit has been measured to be 45. We set | |
117 | ** the maximum lower to give a margin for changing the amount of stack | |
118 | ** used by various functions involved in parsing and executing code. | |
119 | */ | |
120 | #if !defined(LUAI_MAXCCALLS) | |
121 | #define LUAI_MAXCCALLS 20 | |
122 | #endif | |
123 | ||
3eabed74 MA |
124 | /* |
125 | * Minimum amount of available stack space (in bytes) to make a C call. With | |
126 | * gsub() recursion, the stack space between each luaD_call() is 1256 bytes. | |
127 | */ | |
128 | #define LUAI_MINCSTACK 4096 | |
129 | ||
d99a0153 CW |
130 | /* |
131 | ** maximum number of upvalues in a closure (both C and Lua). (Value | |
132 | ** must fit in an unsigned char.) | |
133 | */ | |
134 | #define MAXUPVAL UCHAR_MAX | |
135 | ||
136 | ||
137 | /* | |
138 | ** type for virtual-machine instructions | |
139 | ** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h) | |
140 | */ | |
141 | typedef lu_int32 Instruction; | |
142 | ||
143 | ||
144 | ||
145 | /* maximum stack for a Lua function */ | |
146 | #define MAXSTACK 250 | |
147 | ||
148 | ||
149 | ||
150 | /* minimum size for the string table (must be power of 2) */ | |
151 | #if !defined(MINSTRTABSIZE) | |
152 | #define MINSTRTABSIZE 32 | |
153 | #endif | |
154 | ||
155 | ||
156 | /* minimum size for string buffer */ | |
157 | #if !defined(LUA_MINBUFFER) | |
158 | #define LUA_MINBUFFER 32 | |
159 | #endif | |
160 | ||
161 | ||
162 | #if !defined(lua_lock) | |
163 | #define lua_lock(L) ((void) 0) | |
164 | #define lua_unlock(L) ((void) 0) | |
165 | #endif | |
166 | ||
167 | #if !defined(luai_threadyield) | |
168 | #define luai_threadyield(L) {lua_unlock(L); lua_lock(L);} | |
169 | #endif | |
170 | ||
171 | ||
172 | /* | |
173 | ** these macros allow user-specific actions on threads when you defined | |
174 | ** LUAI_EXTRASPACE and need to do something extra when a thread is | |
175 | ** created/deleted/resumed/yielded. | |
176 | */ | |
177 | #if !defined(luai_userstateopen) | |
178 | #define luai_userstateopen(L) ((void)L) | |
179 | #endif | |
180 | ||
181 | #if !defined(luai_userstateclose) | |
182 | #define luai_userstateclose(L) ((void)L) | |
183 | #endif | |
184 | ||
185 | #if !defined(luai_userstatethread) | |
186 | #define luai_userstatethread(L,L1) ((void)L) | |
187 | #endif | |
188 | ||
189 | #if !defined(luai_userstatefree) | |
190 | #define luai_userstatefree(L,L1) ((void)L) | |
191 | #endif | |
192 | ||
193 | #if !defined(luai_userstateresume) | |
194 | #define luai_userstateresume(L,n) ((void)L) | |
195 | #endif | |
196 | ||
197 | #if !defined(luai_userstateyield) | |
198 | #define luai_userstateyield(L,n) ((void)L) | |
199 | #endif | |
200 | ||
201 | /* | |
202 | ** lua_number2int is a macro to convert lua_Number to int. | |
203 | ** lua_number2integer is a macro to convert lua_Number to lua_Integer. | |
204 | ** lua_number2unsigned is a macro to convert a lua_Number to a lua_Unsigned. | |
205 | ** lua_unsigned2number is a macro to convert a lua_Unsigned to a lua_Number. | |
206 | ** luai_hashnum is a macro to hash a lua_Number value into an integer. | |
207 | ** The hash must be deterministic and give reasonable values for | |
208 | ** both small and large values (outside the range of integers). | |
209 | */ | |
210 | ||
211 | #if defined(MS_ASMTRICK) || defined(LUA_MSASMTRICK) /* { */ | |
212 | /* trick with Microsoft assembler for X86 */ | |
213 | ||
214 | #define lua_number2int(i,n) __asm {__asm fld n __asm fistp i} | |
215 | #define lua_number2integer(i,n) lua_number2int(i, n) | |
216 | #define lua_number2unsigned(i,n) \ | |
217 | {__int64 l; __asm {__asm fld n __asm fistp l} i = (unsigned int)l;} | |
218 | ||
219 | ||
220 | #elif defined(LUA_IEEE754TRICK) /* }{ */ | |
221 | /* the next trick should work on any machine using IEEE754 with | |
222 | a 32-bit int type */ | |
223 | ||
224 | union luai_Cast { double l_d; LUA_INT32 l_p[2]; }; | |
225 | ||
226 | #if !defined(LUA_IEEEENDIAN) /* { */ | |
227 | #define LUAI_EXTRAIEEE \ | |
228 | static const union luai_Cast ieeeendian = {-(33.0 + 6755399441055744.0)}; | |
229 | #define LUA_IEEEENDIANLOC (ieeeendian.l_p[1] == 33) | |
230 | #else | |
231 | #define LUA_IEEEENDIANLOC LUA_IEEEENDIAN | |
232 | #define LUAI_EXTRAIEEE /* empty */ | |
233 | #endif /* } */ | |
234 | ||
235 | #define lua_number2int32(i,n,t) \ | |
236 | { LUAI_EXTRAIEEE \ | |
237 | volatile union luai_Cast u; u.l_d = (n) + 6755399441055744.0; \ | |
238 | (i) = (t)u.l_p[LUA_IEEEENDIANLOC]; } | |
239 | ||
240 | #define luai_hashnum(i,n) \ | |
241 | { volatile union luai_Cast u; u.l_d = (n) + 1.0; /* avoid -0 */ \ | |
242 | (i) = u.l_p[0]; (i) += u.l_p[1]; } /* add double bits for his hash */ | |
243 | ||
244 | #define lua_number2int(i,n) lua_number2int32(i, n, int) | |
245 | #define lua_number2unsigned(i,n) lua_number2int32(i, n, lua_Unsigned) | |
246 | ||
247 | /* the trick can be expanded to lua_Integer when it is a 32-bit value */ | |
248 | #if defined(LUA_IEEELL) | |
249 | #define lua_number2integer(i,n) lua_number2int32(i, n, lua_Integer) | |
250 | #endif | |
251 | ||
252 | #endif /* } */ | |
253 | ||
254 | ||
255 | /* the following definitions always work, but may be slow */ | |
256 | ||
257 | #if !defined(lua_number2int) | |
258 | #define lua_number2int(i,n) ((i)=(int)(n)) | |
259 | #endif | |
260 | ||
261 | #if !defined(lua_number2integer) | |
262 | #define lua_number2integer(i,n) ((i)=(lua_Integer)(n)) | |
263 | #endif | |
264 | ||
265 | #if !defined(lua_number2unsigned) /* { */ | |
266 | /* the following definition assures proper modulo behavior */ | |
267 | #if defined(LUA_NUMBER_DOUBLE) || defined(LUA_NUMBER_FLOAT) | |
268 | #include <math.h> | |
269 | #define SUPUNSIGNED ((lua_Number)(~(lua_Unsigned)0) + 1) | |
270 | #define lua_number2unsigned(i,n) \ | |
271 | ((i)=(lua_Unsigned)((n) - floor((n)/SUPUNSIGNED)*SUPUNSIGNED)) | |
272 | #else | |
273 | #define lua_number2unsigned(i,n) ((i)=(lua_Unsigned)(n)) | |
274 | #endif | |
275 | #endif /* } */ | |
276 | ||
277 | ||
278 | #if !defined(lua_unsigned2number) | |
279 | /* on several machines, coercion from unsigned to double is slow, | |
280 | so it may be worth to avoid */ | |
281 | #define lua_unsigned2number(u) \ | |
282 | (((u) <= (lua_Unsigned)INT_MAX) ? (lua_Number)(int)(u) : (lua_Number)(u)) | |
283 | #endif | |
284 | ||
285 | ||
286 | ||
287 | #if defined(ltable_c) && !defined(luai_hashnum) | |
288 | ||
d99a0153 CW |
289 | #define luai_hashnum(i,n) (i = lcompat_hashnum(n)) |
290 | ||
291 | #endif | |
292 | ||
293 | ||
294 | ||
295 | /* | |
296 | ** macro to control inclusion of some hard tests on stack reallocation | |
297 | */ | |
298 | #if !defined(HARDSTACKTESTS) | |
299 | #define condmovestack(L) ((void)0) | |
300 | #else | |
301 | /* realloc stack keeping its size */ | |
302 | #define condmovestack(L) luaD_reallocstack((L), (L)->stacksize) | |
303 | #endif | |
304 | ||
305 | #if !defined(HARDMEMTESTS) | |
306 | #define condchangemem(L) condmovestack(L) | |
307 | #else | |
308 | #define condchangemem(L) \ | |
309 | ((void)(!(G(L)->gcrunning) || (luaC_fullgc(L, 0), 1))) | |
310 | #endif | |
311 | ||
312 | #endif |