|
1866
|
1 /*
|
|
|
2 ** $Id: lapi.c,v 2.171 2013/03/16 21:10:18 roberto Exp $
|
|
|
3 ** Lua API
|
|
|
4 ** See Copyright Notice in lua.h
|
|
|
5 */
|
|
|
6
|
|
|
7
|
|
|
8 #include <stdarg.h>
|
|
|
9 #include <string.h>
|
|
|
10
|
|
|
11 #define lapi_c
|
|
|
12 #define LUA_CORE
|
|
|
13
|
|
|
14 #include "lua.h"
|
|
|
15
|
|
|
16 #include "lapi.h"
|
|
|
17 #include "ldebug.h"
|
|
|
18 #include "ldo.h"
|
|
|
19 #include "lfunc.h"
|
|
|
20 #include "lgc.h"
|
|
|
21 #include "lmem.h"
|
|
|
22 #include "lobject.h"
|
|
|
23 #include "lstate.h"
|
|
|
24 #include "lstring.h"
|
|
|
25 #include "ltable.h"
|
|
|
26 #include "ltm.h"
|
|
|
27 #include "lundump.h"
|
|
|
28 #include "lvm.h"
|
|
|
29
|
|
|
30
|
|
|
31
|
|
|
32 const char lua_ident[] =
|
|
|
33 "$LuaVersion: " LUA_COPYRIGHT " $"
|
|
|
34 "$LuaAuthors: " LUA_AUTHORS " $";
|
|
|
35
|
|
|
36
|
|
|
37 /* value at a non-valid index */
|
|
|
38 #define NONVALIDVALUE cast(TValue *, luaO_nilobject)
|
|
|
39
|
|
|
40 /* corresponding test */
|
|
|
41 #define isvalid(o) ((o) != luaO_nilobject)
|
|
|
42
|
|
|
43 /* test for pseudo index */
|
|
|
44 #define ispseudo(i) ((i) <= LUA_REGISTRYINDEX)
|
|
|
45
|
|
|
46 /* test for valid but not pseudo index */
|
|
|
47 #define isstackindex(i, o) (isvalid(o) && !ispseudo(i))
|
|
|
48
|
|
|
49 #define api_checkvalidindex(L, o) api_check(L, isvalid(o), "invalid index")
|
|
|
50
|
|
|
51 #define api_checkstackindex(L, i, o) \
|
|
|
52 api_check(L, isstackindex(i, o), "index not in the stack")
|
|
|
53
|
|
|
54
|
|
|
55 static TValue *index2addr (lua_State *L, int idx) {
|
|
|
56 CallInfo *ci = L->ci;
|
|
|
57 if (idx > 0) {
|
|
|
58 TValue *o = ci->func + idx;
|
|
|
59 api_check(L, idx <= ci->top - (ci->func + 1), "unacceptable index");
|
|
|
60 if (o >= L->top) return NONVALIDVALUE;
|
|
|
61 else return o;
|
|
|
62 }
|
|
|
63 else if (!ispseudo(idx)) { /* negative index */
|
|
|
64 api_check(L, idx != 0 && -idx <= L->top - (ci->func + 1), "invalid index");
|
|
|
65 return L->top + idx;
|
|
|
66 }
|
|
|
67 else if (idx == LUA_REGISTRYINDEX)
|
|
|
68 return &G(L)->l_registry;
|
|
|
69 else { /* upvalues */
|
|
|
70 idx = LUA_REGISTRYINDEX - idx;
|
|
|
71 api_check(L, idx <= MAXUPVAL + 1, "upvalue index too large");
|
|
|
72 if (ttislcf(ci->func)) /* light C function? */
|
|
|
73 return NONVALIDVALUE; /* it has no upvalues */
|
|
|
74 else {
|
|
|
75 CClosure *func = clCvalue(ci->func);
|
|
|
76 return (idx <= func->nupvalues) ? &func->upvalue[idx-1] : NONVALIDVALUE;
|
|
|
77 }
|
|
|
78 }
|
|
|
79 }
|
|
|
80
|
|
|
81
|
|
|
82 /*
|
|
|
83 ** to be called by 'lua_checkstack' in protected mode, to grow stack
|
|
|
84 ** capturing memory errors
|
|
|
85 */
|
|
|
86 static void growstack (lua_State *L, void *ud) {
|
|
|
87 int size = *(int *)ud;
|
|
|
88 luaD_growstack(L, size);
|
|
|
89 }
|
|
|
90
|
|
|
91
|
|
|
92 LUA_API int lua_checkstack (lua_State *L, int size) {
|
|
|
93 int res;
|
|
|
94 CallInfo *ci = L->ci;
|
|
|
95 lua_lock(L);
|
|
|
96 if (L->stack_last - L->top > size) /* stack large enough? */
|
|
|
97 res = 1; /* yes; check is OK */
|
|
|
98 else { /* no; need to grow stack */
|
|
|
99 int inuse = cast_int(L->top - L->stack) + EXTRA_STACK;
|
|
|
100 if (inuse > LUAI_MAXSTACK - size) /* can grow without overflow? */
|
|
|
101 res = 0; /* no */
|
|
|
102 else /* try to grow stack */
|
|
|
103 res = (luaD_rawrunprotected(L, &growstack, &size) == LUA_OK);
|
|
|
104 }
|
|
|
105 if (res && ci->top < L->top + size)
|
|
|
106 ci->top = L->top + size; /* adjust frame top */
|
|
|
107 lua_unlock(L);
|
|
|
108 return res;
|
|
|
109 }
|
|
|
110
|
|
|
111
|
|
|
112 LUA_API void lua_xmove (lua_State *from, lua_State *to, int n) {
|
|
|
113 int i;
|
|
|
114 if (from == to) return;
|
|
|
115 lua_lock(to);
|
|
|
116 api_checknelems(from, n);
|
|
|
117 api_check(from, G(from) == G(to), "moving among independent states");
|
|
|
118 api_check(from, to->ci->top - to->top >= n, "not enough elements to move");
|
|
|
119 from->top -= n;
|
|
|
120 for (i = 0; i < n; i++) {
|
|
|
121 setobj2s(to, to->top++, from->top + i);
|
|
|
122 }
|
|
|
123 lua_unlock(to);
|
|
|
124 }
|
|
|
125
|
|
|
126
|
|
|
127 LUA_API lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf) {
|
|
|
128 lua_CFunction old;
|
|
|
129 lua_lock(L);
|
|
|
130 old = G(L)->panic;
|
|
|
131 G(L)->panic = panicf;
|
|
|
132 lua_unlock(L);
|
|
|
133 return old;
|
|
|
134 }
|
|
|
135
|
|
|
136
|
|
|
137 LUA_API const lua_Number *lua_version (lua_State *L) {
|
|
|
138 static const lua_Number version = LUA_VERSION_NUM;
|
|
|
139 if (L == NULL) return &version;
|
|
|
140 else return G(L)->version;
|
|
|
141 }
|
|
|
142
|
|
|
143
|
|
|
144
|
|
|
145 /*
|
|
|
146 ** basic stack manipulation
|
|
|
147 */
|
|
|
148
|
|
|
149
|
|
|
150 /*
|
|
|
151 ** convert an acceptable stack index into an absolute index
|
|
|
152 */
|
|
|
153 LUA_API int lua_absindex (lua_State *L, int idx) {
|
|
|
154 return (idx > 0 || ispseudo(idx))
|
|
|
155 ? idx
|
|
|
156 : cast_int(L->top - L->ci->func + idx);
|
|
|
157 }
|
|
|
158
|
|
|
159
|
|
|
160 LUA_API int lua_gettop (lua_State *L) {
|
|
|
161 return cast_int(L->top - (L->ci->func + 1));
|
|
|
162 }
|
|
|
163
|
|
|
164
|
|
|
165 LUA_API void lua_settop (lua_State *L, int idx) {
|
|
|
166 StkId func = L->ci->func;
|
|
|
167 lua_lock(L);
|
|
|
168 if (idx >= 0) {
|
|
|
169 api_check(L, idx <= L->stack_last - (func + 1), "new top too large");
|
|
|
170 while (L->top < (func + 1) + idx)
|
|
|
171 setnilvalue(L->top++);
|
|
|
172 L->top = (func + 1) + idx;
|
|
|
173 }
|
|
|
174 else {
|
|
|
175 api_check(L, -(idx+1) <= (L->top - (func + 1)), "invalid new top");
|
|
|
176 L->top += idx+1; /* `subtract' index (index is negative) */
|
|
|
177 }
|
|
|
178 lua_unlock(L);
|
|
|
179 }
|
|
|
180
|
|
|
181
|
|
|
182 LUA_API void lua_remove (lua_State *L, int idx) {
|
|
|
183 StkId p;
|
|
|
184 lua_lock(L);
|
|
|
185 p = index2addr(L, idx);
|
|
|
186 api_checkstackindex(L, idx, p);
|
|
|
187 while (++p < L->top) setobjs2s(L, p-1, p);
|
|
|
188 L->top--;
|
|
|
189 lua_unlock(L);
|
|
|
190 }
|
|
|
191
|
|
|
192
|
|
|
193 LUA_API void lua_insert (lua_State *L, int idx) {
|
|
|
194 StkId p;
|
|
|
195 StkId q;
|
|
|
196 lua_lock(L);
|
|
|
197 p = index2addr(L, idx);
|
|
|
198 api_checkstackindex(L, idx, p);
|
|
|
199 for (q = L->top; q > p; q--) /* use L->top as a temporary */
|
|
|
200 setobjs2s(L, q, q - 1);
|
|
|
201 setobjs2s(L, p, L->top);
|
|
|
202 lua_unlock(L);
|
|
|
203 }
|
|
|
204
|
|
|
205
|
|
|
206 static void moveto (lua_State *L, TValue *fr, int idx) {
|
|
|
207 TValue *to = index2addr(L, idx);
|
|
|
208 api_checkvalidindex(L, to);
|
|
|
209 setobj(L, to, fr);
|
|
|
210 if (idx < LUA_REGISTRYINDEX) /* function upvalue? */
|
|
|
211 luaC_barrier(L, clCvalue(L->ci->func), fr);
|
|
|
212 /* LUA_REGISTRYINDEX does not need gc barrier
|
|
|
213 (collector revisits it before finishing collection) */
|
|
|
214 }
|
|
|
215
|
|
|
216
|
|
|
217 LUA_API void lua_replace (lua_State *L, int idx) {
|
|
|
218 lua_lock(L);
|
|
|
219 api_checknelems(L, 1);
|
|
|
220 moveto(L, L->top - 1, idx);
|
|
|
221 L->top--;
|
|
|
222 lua_unlock(L);
|
|
|
223 }
|
|
|
224
|
|
|
225
|
|
|
226 LUA_API void lua_copy (lua_State *L, int fromidx, int toidx) {
|
|
|
227 TValue *fr;
|
|
|
228 lua_lock(L);
|
|
|
229 fr = index2addr(L, fromidx);
|
|
|
230 moveto(L, fr, toidx);
|
|
|
231 lua_unlock(L);
|
|
|
232 }
|
|
|
233
|
|
|
234
|
|
|
235 LUA_API void lua_pushvalue (lua_State *L, int idx) {
|
|
|
236 lua_lock(L);
|
|
|
237 setobj2s(L, L->top, index2addr(L, idx));
|
|
|
238 api_incr_top(L);
|
|
|
239 lua_unlock(L);
|
|
|
240 }
|
|
|
241
|
|
|
242
|
|
|
243
|
|
|
244 /*
|
|
|
245 ** access functions (stack -> C)
|
|
|
246 */
|
|
|
247
|
|
|
248
|
|
|
249 LUA_API int lua_type (lua_State *L, int idx) {
|
|
|
250 StkId o = index2addr(L, idx);
|
|
|
251 return (isvalid(o) ? ttypenv(o) : LUA_TNONE);
|
|
|
252 }
|
|
|
253
|
|
|
254
|
|
|
255 LUA_API const char *lua_typename (lua_State *L, int t) {
|
|
|
256 UNUSED(L);
|
|
|
257 return ttypename(t);
|
|
|
258 }
|
|
|
259
|
|
|
260
|
|
|
261 LUA_API int lua_iscfunction (lua_State *L, int idx) {
|
|
|
262 StkId o = index2addr(L, idx);
|
|
|
263 return (ttislcf(o) || (ttisCclosure(o)));
|
|
|
264 }
|
|
|
265
|
|
|
266
|
|
|
267 LUA_API int lua_isnumber (lua_State *L, int idx) {
|
|
|
268 TValue n;
|
|
|
269 const TValue *o = index2addr(L, idx);
|
|
|
270 return tonumber(o, &n);
|
|
|
271 }
|
|
|
272
|
|
|
273
|
|
|
274 LUA_API int lua_isstring (lua_State *L, int idx) {
|
|
|
275 int t = lua_type(L, idx);
|
|
|
276 return (t == LUA_TSTRING || t == LUA_TNUMBER);
|
|
|
277 }
|
|
|
278
|
|
|
279
|
|
|
280 LUA_API int lua_isuserdata (lua_State *L, int idx) {
|
|
|
281 const TValue *o = index2addr(L, idx);
|
|
|
282 return (ttisuserdata(o) || ttislightuserdata(o));
|
|
|
283 }
|
|
|
284
|
|
|
285
|
|
|
286 LUA_API int lua_rawequal (lua_State *L, int index1, int index2) {
|
|
|
287 StkId o1 = index2addr(L, index1);
|
|
|
288 StkId o2 = index2addr(L, index2);
|
|
|
289 return (isvalid(o1) && isvalid(o2)) ? luaV_rawequalobj(o1, o2) : 0;
|
|
|
290 }
|
|
|
291
|
|
|
292
|
|
|
293 LUA_API void lua_arith (lua_State *L, int op) {
|
|
|
294 StkId o1; /* 1st operand */
|
|
|
295 StkId o2; /* 2nd operand */
|
|
|
296 lua_lock(L);
|
|
|
297 if (op != LUA_OPUNM) /* all other operations expect two operands */
|
|
|
298 api_checknelems(L, 2);
|
|
|
299 else { /* for unary minus, add fake 2nd operand */
|
|
|
300 api_checknelems(L, 1);
|
|
|
301 setobjs2s(L, L->top, L->top - 1);
|
|
|
302 L->top++;
|
|
|
303 }
|
|
|
304 o1 = L->top - 2;
|
|
|
305 o2 = L->top - 1;
|
|
|
306 if (ttisnumber(o1) && ttisnumber(o2)) {
|
|
|
307 setnvalue(o1, luaO_arith(op, nvalue(o1), nvalue(o2)));
|
|
|
308 }
|
|
|
309 else
|
|
|
310 luaV_arith(L, o1, o1, o2, cast(TMS, op - LUA_OPADD + TM_ADD));
|
|
|
311 L->top--;
|
|
|
312 lua_unlock(L);
|
|
|
313 }
|
|
|
314
|
|
|
315
|
|
|
316 LUA_API int lua_compare (lua_State *L, int index1, int index2, int op) {
|
|
|
317 StkId o1, o2;
|
|
|
318 int i = 0;
|
|
|
319 lua_lock(L); /* may call tag method */
|
|
|
320 o1 = index2addr(L, index1);
|
|
|
321 o2 = index2addr(L, index2);
|
|
|
322 if (isvalid(o1) && isvalid(o2)) {
|
|
|
323 switch (op) {
|
|
|
324 case LUA_OPEQ: i = equalobj(L, o1, o2); break;
|
|
|
325 case LUA_OPLT: i = luaV_lessthan(L, o1, o2); break;
|
|
|
326 case LUA_OPLE: i = luaV_lessequal(L, o1, o2); break;
|
|
|
327 default: api_check(L, 0, "invalid option");
|
|
|
328 }
|
|
|
329 }
|
|
|
330 lua_unlock(L);
|
|
|
331 return i;
|
|
|
332 }
|
|
|
333
|
|
|
334
|
|
|
335 LUA_API lua_Number lua_tonumberx (lua_State *L, int idx, int *isnum) {
|
|
|
336 TValue n;
|
|
|
337 const TValue *o = index2addr(L, idx);
|
|
|
338 if (tonumber(o, &n)) {
|
|
|
339 if (isnum) *isnum = 1;
|
|
|
340 return nvalue(o);
|
|
|
341 }
|
|
|
342 else {
|
|
|
343 if (isnum) *isnum = 0;
|
|
|
344 return 0;
|
|
|
345 }
|
|
|
346 }
|
|
|
347
|
|
|
348
|
|
|
349 LUA_API lua_Integer lua_tointegerx (lua_State *L, int idx, int *isnum) {
|
|
|
350 TValue n;
|
|
|
351 const TValue *o = index2addr(L, idx);
|
|
|
352 if (tonumber(o, &n)) {
|
|
|
353 lua_Integer res;
|
|
|
354 lua_Number num = nvalue(o);
|
|
|
355 lua_number2integer(res, num);
|
|
|
356 if (isnum) *isnum = 1;
|
|
|
357 return res;
|
|
|
358 }
|
|
|
359 else {
|
|
|
360 if (isnum) *isnum = 0;
|
|
|
361 return 0;
|
|
|
362 }
|
|
|
363 }
|
|
|
364
|
|
|
365
|
|
|
366 LUA_API lua_Unsigned lua_tounsignedx (lua_State *L, int idx, int *isnum) {
|
|
|
367 TValue n;
|
|
|
368 const TValue *o = index2addr(L, idx);
|
|
|
369 if (tonumber(o, &n)) {
|
|
|
370 lua_Unsigned res;
|
|
|
371 lua_Number num = nvalue(o);
|
|
|
372 lua_number2unsigned(res, num);
|
|
|
373 if (isnum) *isnum = 1;
|
|
|
374 return res;
|
|
|
375 }
|
|
|
376 else {
|
|
|
377 if (isnum) *isnum = 0;
|
|
|
378 return 0;
|
|
|
379 }
|
|
|
380 }
|
|
|
381
|
|
|
382
|
|
|
383 LUA_API int lua_toboolean (lua_State *L, int idx) {
|
|
|
384 const TValue *o = index2addr(L, idx);
|
|
|
385 return !l_isfalse(o);
|
|
|
386 }
|
|
|
387
|
|
|
388
|
|
|
389 LUA_API const char *lua_tolstring (lua_State *L, int idx, size_t *len) {
|
|
|
390 StkId o = index2addr(L, idx);
|
|
|
391 if (!ttisstring(o)) {
|
|
|
392 lua_lock(L); /* `luaV_tostring' may create a new string */
|
|
|
393 if (!luaV_tostring(L, o)) { /* conversion failed? */
|
|
|
394 if (len != NULL) *len = 0;
|
|
|
395 lua_unlock(L);
|
|
|
396 return NULL;
|
|
|
397 }
|
|
|
398 luaC_checkGC(L);
|
|
|
399 o = index2addr(L, idx); /* previous call may reallocate the stack */
|
|
|
400 lua_unlock(L);
|
|
|
401 }
|
|
|
402 if (len != NULL) *len = tsvalue(o)->len;
|
|
|
403 return svalue(o);
|
|
|
404 }
|
|
|
405
|
|
|
406
|
|
|
407 LUA_API size_t lua_rawlen (lua_State *L, int idx) {
|
|
|
408 StkId o = index2addr(L, idx);
|
|
|
409 switch (ttypenv(o)) {
|
|
|
410 case LUA_TSTRING: return tsvalue(o)->len;
|
|
|
411 case LUA_TUSERDATA: return uvalue(o)->len;
|
|
|
412 case LUA_TTABLE: return luaH_getn(hvalue(o));
|
|
|
413 default: return 0;
|
|
|
414 }
|
|
|
415 }
|
|
|
416
|
|
|
417
|
|
|
418 LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx) {
|
|
|
419 StkId o = index2addr(L, idx);
|
|
|
420 if (ttislcf(o)) return fvalue(o);
|
|
|
421 else if (ttisCclosure(o))
|
|
|
422 return clCvalue(o)->f;
|
|
|
423 else return NULL; /* not a C function */
|
|
|
424 }
|
|
|
425
|
|
|
426
|
|
|
427 LUA_API void *lua_touserdata (lua_State *L, int idx) {
|
|
|
428 StkId o = index2addr(L, idx);
|
|
|
429 switch (ttypenv(o)) {
|
|
|
430 case LUA_TUSERDATA: return (rawuvalue(o) + 1);
|
|
|
431 case LUA_TLIGHTUSERDATA: return pvalue(o);
|
|
|
432 default: return NULL;
|
|
|
433 }
|
|
|
434 }
|
|
|
435
|
|
|
436
|
|
|
437 LUA_API lua_State *lua_tothread (lua_State *L, int idx) {
|
|
|
438 StkId o = index2addr(L, idx);
|
|
|
439 return (!ttisthread(o)) ? NULL : thvalue(o);
|
|
|
440 }
|
|
|
441
|
|
|
442
|
|
|
443 LUA_API const void *lua_topointer (lua_State *L, int idx) {
|
|
|
444 StkId o = index2addr(L, idx);
|
|
|
445 switch (ttype(o)) {
|
|
|
446 case LUA_TTABLE: return hvalue(o);
|
|
|
447 case LUA_TLCL: return clLvalue(o);
|
|
|
448 case LUA_TCCL: return clCvalue(o);
|
|
|
449 case LUA_TLCF: return cast(void *, cast(size_t, fvalue(o)));
|
|
|
450 case LUA_TTHREAD: return thvalue(o);
|
|
|
451 case LUA_TUSERDATA:
|
|
|
452 case LUA_TLIGHTUSERDATA:
|
|
|
453 return lua_touserdata(L, idx);
|
|
|
454 default: return NULL;
|
|
|
455 }
|
|
|
456 }
|
|
|
457
|
|
|
458
|
|
|
459
|
|
|
460 /*
|
|
|
461 ** push functions (C -> stack)
|
|
|
462 */
|
|
|
463
|
|
|
464
|
|
|
465 LUA_API void lua_pushnil (lua_State *L) {
|
|
|
466 lua_lock(L);
|
|
|
467 setnilvalue(L->top);
|
|
|
468 api_incr_top(L);
|
|
|
469 lua_unlock(L);
|
|
|
470 }
|
|
|
471
|
|
|
472
|
|
|
473 LUA_API void lua_pushnumber (lua_State *L, lua_Number n) {
|
|
|
474 lua_lock(L);
|
|
|
475 setnvalue(L->top, n);
|
|
|
476 luai_checknum(L, L->top,
|
|
|
477 luaG_runerror(L, "C API - attempt to push a signaling NaN"));
|
|
|
478 api_incr_top(L);
|
|
|
479 lua_unlock(L);
|
|
|
480 }
|
|
|
481
|
|
|
482
|
|
|
483 LUA_API void lua_pushinteger (lua_State *L, lua_Integer n) {
|
|
|
484 lua_lock(L);
|
|
|
485 setnvalue(L->top, cast_num(n));
|
|
|
486 api_incr_top(L);
|
|
|
487 lua_unlock(L);
|
|
|
488 }
|
|
|
489
|
|
|
490
|
|
|
491 LUA_API void lua_pushunsigned (lua_State *L, lua_Unsigned u) {
|
|
|
492 lua_Number n;
|
|
|
493 lua_lock(L);
|
|
|
494 n = lua_unsigned2number(u);
|
|
|
495 setnvalue(L->top, n);
|
|
|
496 api_incr_top(L);
|
|
|
497 lua_unlock(L);
|
|
|
498 }
|
|
|
499
|
|
|
500
|
|
|
501 LUA_API const char *lua_pushlstring (lua_State *L, const char *s, size_t len) {
|
|
|
502 TString *ts;
|
|
|
503 lua_lock(L);
|
|
|
504 luaC_checkGC(L);
|
|
|
505 ts = luaS_newlstr(L, s, len);
|
|
|
506 setsvalue2s(L, L->top, ts);
|
|
|
507 api_incr_top(L);
|
|
|
508 lua_unlock(L);
|
|
|
509 return getstr(ts);
|
|
|
510 }
|
|
|
511
|
|
|
512
|
|
|
513 LUA_API const char *lua_pushstring (lua_State *L, const char *s) {
|
|
|
514 if (s == NULL) {
|
|
|
515 lua_pushnil(L);
|
|
|
516 return NULL;
|
|
|
517 }
|
|
|
518 else {
|
|
|
519 TString *ts;
|
|
|
520 lua_lock(L);
|
|
|
521 luaC_checkGC(L);
|
|
|
522 ts = luaS_new(L, s);
|
|
|
523 setsvalue2s(L, L->top, ts);
|
|
|
524 api_incr_top(L);
|
|
|
525 lua_unlock(L);
|
|
|
526 return getstr(ts);
|
|
|
527 }
|
|
|
528 }
|
|
|
529
|
|
|
530
|
|
|
531 LUA_API const char *lua_pushvfstring (lua_State *L, const char *fmt,
|
|
|
532 va_list argp) {
|
|
|
533 const char *ret;
|
|
|
534 lua_lock(L);
|
|
|
535 luaC_checkGC(L);
|
|
|
536 ret = luaO_pushvfstring(L, fmt, argp);
|
|
|
537 lua_unlock(L);
|
|
|
538 return ret;
|
|
|
539 }
|
|
|
540
|
|
|
541
|
|
|
542 LUA_API const char *lua_pushfstring (lua_State *L, const char *fmt, ...) {
|
|
|
543 const char *ret;
|
|
|
544 va_list argp;
|
|
|
545 lua_lock(L);
|
|
|
546 luaC_checkGC(L);
|
|
|
547 va_start(argp, fmt);
|
|
|
548 ret = luaO_pushvfstring(L, fmt, argp);
|
|
|
549 va_end(argp);
|
|
|
550 lua_unlock(L);
|
|
|
551 return ret;
|
|
|
552 }
|
|
|
553
|
|
|
554
|
|
|
555 LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
|
|
|
556 lua_lock(L);
|
|
|
557 if (n == 0) {
|
|
|
558 setfvalue(L->top, fn);
|
|
|
559 }
|
|
|
560 else {
|
|
|
561 Closure *cl;
|
|
|
562 api_checknelems(L, n);
|
|
|
563 api_check(L, n <= MAXUPVAL, "upvalue index too large");
|
|
|
564 luaC_checkGC(L);
|
|
|
565 cl = luaF_newCclosure(L, n);
|
|
|
566 cl->c.f = fn;
|
|
|
567 L->top -= n;
|
|
|
568 while (n--)
|
|
|
569 setobj2n(L, &cl->c.upvalue[n], L->top + n);
|
|
|
570 setclCvalue(L, L->top, cl);
|
|
|
571 }
|
|
|
572 api_incr_top(L);
|
|
|
573 lua_unlock(L);
|
|
|
574 }
|
|
|
575
|
|
|
576
|
|
|
577 LUA_API void lua_pushboolean (lua_State *L, int b) {
|
|
|
578 lua_lock(L);
|
|
|
579 setbvalue(L->top, (b != 0)); /* ensure that true is 1 */
|
|
|
580 api_incr_top(L);
|
|
|
581 lua_unlock(L);
|
|
|
582 }
|
|
|
583
|
|
|
584
|
|
|
585 LUA_API void lua_pushlightuserdata (lua_State *L, void *p) {
|
|
|
586 lua_lock(L);
|
|
|
587 setpvalue(L->top, p);
|
|
|
588 api_incr_top(L);
|
|
|
589 lua_unlock(L);
|
|
|
590 }
|
|
|
591
|
|
|
592
|
|
|
593 LUA_API int lua_pushthread (lua_State *L) {
|
|
|
594 lua_lock(L);
|
|
|
595 setthvalue(L, L->top, L);
|
|
|
596 api_incr_top(L);
|
|
|
597 lua_unlock(L);
|
|
|
598 return (G(L)->mainthread == L);
|
|
|
599 }
|
|
|
600
|
|
|
601
|
|
|
602
|
|
|
603 /*
|
|
|
604 ** get functions (Lua -> stack)
|
|
|
605 */
|
|
|
606
|
|
|
607
|
|
|
608 LUA_API void lua_getglobal (lua_State *L, const char *var) {
|
|
|
609 Table *reg = hvalue(&G(L)->l_registry);
|
|
|
610 const TValue *gt; /* global table */
|
|
|
611 lua_lock(L);
|
|
|
612 gt = luaH_getint(reg, LUA_RIDX_GLOBALS);
|
|
|
613 setsvalue2s(L, L->top++, luaS_new(L, var));
|
|
|
614 luaV_gettable(L, gt, L->top - 1, L->top - 1);
|
|
|
615 lua_unlock(L);
|
|
|
616 }
|
|
|
617
|
|
|
618
|
|
|
619 LUA_API void lua_gettable (lua_State *L, int idx) {
|
|
|
620 StkId t;
|
|
|
621 lua_lock(L);
|
|
|
622 t = index2addr(L, idx);
|
|
|
623 luaV_gettable(L, t, L->top - 1, L->top - 1);
|
|
|
624 lua_unlock(L);
|
|
|
625 }
|
|
|
626
|
|
|
627
|
|
|
628 LUA_API void lua_getfield (lua_State *L, int idx, const char *k) {
|
|
|
629 StkId t;
|
|
|
630 lua_lock(L);
|
|
|
631 t = index2addr(L, idx);
|
|
|
632 setsvalue2s(L, L->top, luaS_new(L, k));
|
|
|
633 api_incr_top(L);
|
|
|
634 luaV_gettable(L, t, L->top - 1, L->top - 1);
|
|
|
635 lua_unlock(L);
|
|
|
636 }
|
|
|
637
|
|
|
638
|
|
|
639 LUA_API void lua_rawget (lua_State *L, int idx) {
|
|
|
640 StkId t;
|
|
|
641 lua_lock(L);
|
|
|
642 t = index2addr(L, idx);
|
|
|
643 api_check(L, ttistable(t), "table expected");
|
|
|
644 setobj2s(L, L->top - 1, luaH_get(hvalue(t), L->top - 1));
|
|
|
645 lua_unlock(L);
|
|
|
646 }
|
|
|
647
|
|
|
648
|
|
|
649 LUA_API void lua_rawgeti (lua_State *L, int idx, int n) {
|
|
|
650 StkId t;
|
|
|
651 lua_lock(L);
|
|
|
652 t = index2addr(L, idx);
|
|
|
653 api_check(L, ttistable(t), "table expected");
|
|
|
654 setobj2s(L, L->top, luaH_getint(hvalue(t), n));
|
|
|
655 api_incr_top(L);
|
|
|
656 lua_unlock(L);
|
|
|
657 }
|
|
|
658
|
|
|
659
|
|
|
660 LUA_API void lua_rawgetp (lua_State *L, int idx, const void *p) {
|
|
|
661 StkId t;
|
|
|
662 TValue k;
|
|
|
663 lua_lock(L);
|
|
|
664 t = index2addr(L, idx);
|
|
|
665 api_check(L, ttistable(t), "table expected");
|
|
|
666 setpvalue(&k, cast(void *, p));
|
|
|
667 setobj2s(L, L->top, luaH_get(hvalue(t), &k));
|
|
|
668 api_incr_top(L);
|
|
|
669 lua_unlock(L);
|
|
|
670 }
|
|
|
671
|
|
|
672
|
|
|
673 LUA_API void lua_createtable (lua_State *L, int narray, int nrec) {
|
|
|
674 Table *t;
|
|
|
675 lua_lock(L);
|
|
|
676 luaC_checkGC(L);
|
|
|
677 t = luaH_new(L);
|
|
|
678 sethvalue(L, L->top, t);
|
|
|
679 api_incr_top(L);
|
|
|
680 if (narray > 0 || nrec > 0)
|
|
|
681 luaH_resize(L, t, narray, nrec);
|
|
|
682 lua_unlock(L);
|
|
|
683 }
|
|
|
684
|
|
|
685
|
|
|
686 LUA_API int lua_getmetatable (lua_State *L, int objindex) {
|
|
|
687 const TValue *obj;
|
|
|
688 Table *mt = NULL;
|
|
|
689 int res;
|
|
|
690 lua_lock(L);
|
|
|
691 obj = index2addr(L, objindex);
|
|
|
692 switch (ttypenv(obj)) {
|
|
|
693 case LUA_TTABLE:
|
|
|
694 mt = hvalue(obj)->metatable;
|
|
|
695 break;
|
|
|
696 case LUA_TUSERDATA:
|
|
|
697 mt = uvalue(obj)->metatable;
|
|
|
698 break;
|
|
|
699 default:
|
|
|
700 mt = G(L)->mt[ttypenv(obj)];
|
|
|
701 break;
|
|
|
702 }
|
|
|
703 if (mt == NULL)
|
|
|
704 res = 0;
|
|
|
705 else {
|
|
|
706 sethvalue(L, L->top, mt);
|
|
|
707 api_incr_top(L);
|
|
|
708 res = 1;
|
|
|
709 }
|
|
|
710 lua_unlock(L);
|
|
|
711 return res;
|
|
|
712 }
|
|
|
713
|
|
|
714
|
|
|
715 LUA_API void lua_getuservalue (lua_State *L, int idx) {
|
|
|
716 StkId o;
|
|
|
717 lua_lock(L);
|
|
|
718 o = index2addr(L, idx);
|
|
|
719 api_check(L, ttisuserdata(o), "userdata expected");
|
|
|
720 if (uvalue(o)->env) {
|
|
|
721 sethvalue(L, L->top, uvalue(o)->env);
|
|
|
722 } else
|
|
|
723 setnilvalue(L->top);
|
|
|
724 api_incr_top(L);
|
|
|
725 lua_unlock(L);
|
|
|
726 }
|
|
|
727
|
|
|
728
|
|
|
729 /*
|
|
|
730 ** set functions (stack -> Lua)
|
|
|
731 */
|
|
|
732
|
|
|
733
|
|
|
734 LUA_API void lua_setglobal (lua_State *L, const char *var) {
|
|
|
735 Table *reg = hvalue(&G(L)->l_registry);
|
|
|
736 const TValue *gt; /* global table */
|
|
|
737 lua_lock(L);
|
|
|
738 api_checknelems(L, 1);
|
|
|
739 gt = luaH_getint(reg, LUA_RIDX_GLOBALS);
|
|
|
740 setsvalue2s(L, L->top++, luaS_new(L, var));
|
|
|
741 luaV_settable(L, gt, L->top - 1, L->top - 2);
|
|
|
742 L->top -= 2; /* pop value and key */
|
|
|
743 lua_unlock(L);
|
|
|
744 }
|
|
|
745
|
|
|
746
|
|
|
747 LUA_API void lua_settable (lua_State *L, int idx) {
|
|
|
748 StkId t;
|
|
|
749 lua_lock(L);
|
|
|
750 api_checknelems(L, 2);
|
|
|
751 t = index2addr(L, idx);
|
|
|
752 luaV_settable(L, t, L->top - 2, L->top - 1);
|
|
|
753 L->top -= 2; /* pop index and value */
|
|
|
754 lua_unlock(L);
|
|
|
755 }
|
|
|
756
|
|
|
757
|
|
|
758 LUA_API void lua_setfield (lua_State *L, int idx, const char *k) {
|
|
|
759 StkId t;
|
|
|
760 lua_lock(L);
|
|
|
761 api_checknelems(L, 1);
|
|
|
762 t = index2addr(L, idx);
|
|
|
763 setsvalue2s(L, L->top++, luaS_new(L, k));
|
|
|
764 luaV_settable(L, t, L->top - 1, L->top - 2);
|
|
|
765 L->top -= 2; /* pop value and key */
|
|
|
766 lua_unlock(L);
|
|
|
767 }
|
|
|
768
|
|
|
769
|
|
|
770 LUA_API void lua_rawset (lua_State *L, int idx) {
|
|
|
771 StkId t;
|
|
|
772 lua_lock(L);
|
|
|
773 api_checknelems(L, 2);
|
|
|
774 t = index2addr(L, idx);
|
|
|
775 api_check(L, ttistable(t), "table expected");
|
|
|
776 setobj2t(L, luaH_set(L, hvalue(t), L->top-2), L->top-1);
|
|
|
777 invalidateTMcache(hvalue(t));
|
|
|
778 luaC_barrierback(L, gcvalue(t), L->top-1);
|
|
|
779 L->top -= 2;
|
|
|
780 lua_unlock(L);
|
|
|
781 }
|
|
|
782
|
|
|
783
|
|
|
784 LUA_API void lua_rawseti (lua_State *L, int idx, int n) {
|
|
|
785 StkId t;
|
|
|
786 lua_lock(L);
|
|
|
787 api_checknelems(L, 1);
|
|
|
788 t = index2addr(L, idx);
|
|
|
789 api_check(L, ttistable(t), "table expected");
|
|
|
790 luaH_setint(L, hvalue(t), n, L->top - 1);
|
|
|
791 luaC_barrierback(L, gcvalue(t), L->top-1);
|
|
|
792 L->top--;
|
|
|
793 lua_unlock(L);
|
|
|
794 }
|
|
|
795
|
|
|
796
|
|
|
797 LUA_API void lua_rawsetp (lua_State *L, int idx, const void *p) {
|
|
|
798 StkId t;
|
|
|
799 TValue k;
|
|
|
800 lua_lock(L);
|
|
|
801 api_checknelems(L, 1);
|
|
|
802 t = index2addr(L, idx);
|
|
|
803 api_check(L, ttistable(t), "table expected");
|
|
|
804 setpvalue(&k, cast(void *, p));
|
|
|
805 setobj2t(L, luaH_set(L, hvalue(t), &k), L->top - 1);
|
|
|
806 luaC_barrierback(L, gcvalue(t), L->top - 1);
|
|
|
807 L->top--;
|
|
|
808 lua_unlock(L);
|
|
|
809 }
|
|
|
810
|
|
|
811
|
|
|
812 LUA_API int lua_setmetatable (lua_State *L, int objindex) {
|
|
|
813 TValue *obj;
|
|
|
814 Table *mt;
|
|
|
815 lua_lock(L);
|
|
|
816 api_checknelems(L, 1);
|
|
|
817 obj = index2addr(L, objindex);
|
|
|
818 if (ttisnil(L->top - 1))
|
|
|
819 mt = NULL;
|
|
|
820 else {
|
|
|
821 api_check(L, ttistable(L->top - 1), "table expected");
|
|
|
822 mt = hvalue(L->top - 1);
|
|
|
823 }
|
|
|
824 switch (ttypenv(obj)) {
|
|
|
825 case LUA_TTABLE: {
|
|
|
826 hvalue(obj)->metatable = mt;
|
|
|
827 if (mt) {
|
|
|
828 luaC_objbarrierback(L, gcvalue(obj), mt);
|
|
|
829 luaC_checkfinalizer(L, gcvalue(obj), mt);
|
|
|
830 }
|
|
|
831 break;
|
|
|
832 }
|
|
|
833 case LUA_TUSERDATA: {
|
|
|
834 uvalue(obj)->metatable = mt;
|
|
|
835 if (mt) {
|
|
|
836 luaC_objbarrier(L, rawuvalue(obj), mt);
|
|
|
837 luaC_checkfinalizer(L, gcvalue(obj), mt);
|
|
|
838 }
|
|
|
839 break;
|
|
|
840 }
|
|
|
841 default: {
|
|
|
842 G(L)->mt[ttypenv(obj)] = mt;
|
|
|
843 break;
|
|
|
844 }
|
|
|
845 }
|
|
|
846 L->top--;
|
|
|
847 lua_unlock(L);
|
|
|
848 return 1;
|
|
|
849 }
|
|
|
850
|
|
|
851
|
|
|
852 LUA_API void lua_setuservalue (lua_State *L, int idx) {
|
|
|
853 StkId o;
|
|
|
854 lua_lock(L);
|
|
|
855 api_checknelems(L, 1);
|
|
|
856 o = index2addr(L, idx);
|
|
|
857 api_check(L, ttisuserdata(o), "userdata expected");
|
|
|
858 if (ttisnil(L->top - 1))
|
|
|
859 uvalue(o)->env = NULL;
|
|
|
860 else {
|
|
|
861 api_check(L, ttistable(L->top - 1), "table expected");
|
|
|
862 uvalue(o)->env = hvalue(L->top - 1);
|
|
|
863 luaC_objbarrier(L, gcvalue(o), hvalue(L->top - 1));
|
|
|
864 }
|
|
|
865 L->top--;
|
|
|
866 lua_unlock(L);
|
|
|
867 }
|
|
|
868
|
|
|
869
|
|
|
870 /*
|
|
|
871 ** `load' and `call' functions (run Lua code)
|
|
|
872 */
|
|
|
873
|
|
|
874
|
|
|
875 #define checkresults(L,na,nr) \
|
|
|
876 api_check(L, (nr) == LUA_MULTRET || (L->ci->top - L->top >= (nr) - (na)), \
|
|
|
877 "results from function overflow current stack size")
|
|
|
878
|
|
|
879
|
|
|
880 LUA_API int lua_getctx (lua_State *L, int *ctx) {
|
|
|
881 if (L->ci->callstatus & CIST_YIELDED) {
|
|
|
882 if (ctx) *ctx = L->ci->u.c.ctx;
|
|
|
883 return L->ci->u.c.status;
|
|
|
884 }
|
|
|
885 else return LUA_OK;
|
|
|
886 }
|
|
|
887
|
|
|
888
|
|
|
889 LUA_API void lua_callk (lua_State *L, int nargs, int nresults, int ctx,
|
|
|
890 lua_CFunction k) {
|
|
|
891 StkId func;
|
|
|
892 lua_lock(L);
|
|
|
893 api_check(L, k == NULL || !isLua(L->ci),
|
|
|
894 "cannot use continuations inside hooks");
|
|
|
895 api_checknelems(L, nargs+1);
|
|
|
896 api_check(L, L->status == LUA_OK, "cannot do calls on non-normal thread");
|
|
|
897 checkresults(L, nargs, nresults);
|
|
|
898 func = L->top - (nargs+1);
|
|
|
899 if (k != NULL && L->nny == 0) { /* need to prepare continuation? */
|
|
|
900 L->ci->u.c.k = k; /* save continuation */
|
|
|
901 L->ci->u.c.ctx = ctx; /* save context */
|
|
|
902 luaD_call(L, func, nresults, 1); /* do the call */
|
|
|
903 }
|
|
|
904 else /* no continuation or no yieldable */
|
|
|
905 luaD_call(L, func, nresults, 0); /* just do the call */
|
|
|
906 adjustresults(L, nresults);
|
|
|
907 lua_unlock(L);
|
|
|
908 }
|
|
|
909
|
|
|
910
|
|
|
911
|
|
|
912 /*
|
|
|
913 ** Execute a protected call.
|
|
|
914 */
|
|
|
915 struct CallS { /* data to `f_call' */
|
|
|
916 StkId func;
|
|
|
917 int nresults;
|
|
|
918 };
|
|
|
919
|
|
|
920
|
|
|
921 static void f_call (lua_State *L, void *ud) {
|
|
|
922 struct CallS *c = cast(struct CallS *, ud);
|
|
|
923 luaD_call(L, c->func, c->nresults, 0);
|
|
|
924 }
|
|
|
925
|
|
|
926
|
|
|
927
|
|
|
928 LUA_API int lua_pcallk (lua_State *L, int nargs, int nresults, int errfunc,
|
|
|
929 int ctx, lua_CFunction k) {
|
|
|
930 struct CallS c;
|
|
|
931 int status;
|
|
|
932 ptrdiff_t func;
|
|
|
933 lua_lock(L);
|
|
|
934 api_check(L, k == NULL || !isLua(L->ci),
|
|
|
935 "cannot use continuations inside hooks");
|
|
|
936 api_checknelems(L, nargs+1);
|
|
|
937 api_check(L, L->status == LUA_OK, "cannot do calls on non-normal thread");
|
|
|
938 checkresults(L, nargs, nresults);
|
|
|
939 if (errfunc == 0)
|
|
|
940 func = 0;
|
|
|
941 else {
|
|
|
942 StkId o = index2addr(L, errfunc);
|
|
|
943 api_checkstackindex(L, errfunc, o);
|
|
|
944 func = savestack(L, o);
|
|
|
945 }
|
|
|
946 c.func = L->top - (nargs+1); /* function to be called */
|
|
|
947 if (k == NULL || L->nny > 0) { /* no continuation or no yieldable? */
|
|
|
948 c.nresults = nresults; /* do a 'conventional' protected call */
|
|
|
949 status = luaD_pcall(L, f_call, &c, savestack(L, c.func), func);
|
|
|
950 }
|
|
|
951 else { /* prepare continuation (call is already protected by 'resume') */
|
|
|
952 CallInfo *ci = L->ci;
|
|
|
953 ci->u.c.k = k; /* save continuation */
|
|
|
954 ci->u.c.ctx = ctx; /* save context */
|
|
|
955 /* save information for error recovery */
|
|
|
956 ci->extra = savestack(L, c.func);
|
|
|
957 ci->u.c.old_allowhook = L->allowhook;
|
|
|
958 ci->u.c.old_errfunc = L->errfunc;
|
|
|
959 L->errfunc = func;
|
|
|
960 /* mark that function may do error recovery */
|
|
|
961 ci->callstatus |= CIST_YPCALL;
|
|
|
962 luaD_call(L, c.func, nresults, 1); /* do the call */
|
|
|
963 ci->callstatus &= ~CIST_YPCALL;
|
|
|
964 L->errfunc = ci->u.c.old_errfunc;
|
|
|
965 status = LUA_OK; /* if it is here, there were no errors */
|
|
|
966 }
|
|
|
967 adjustresults(L, nresults);
|
|
|
968 lua_unlock(L);
|
|
|
969 return status;
|
|
|
970 }
|
|
|
971
|
|
|
972
|
|
|
973 LUA_API int lua_load (lua_State *L, lua_Reader reader, void *data,
|
|
|
974 const char *chunkname, const char *mode) {
|
|
|
975 ZIO z;
|
|
|
976 int status;
|
|
|
977 lua_lock(L);
|
|
|
978 if (!chunkname) chunkname = "?";
|
|
|
979 luaZ_init(L, &z, reader, data);
|
|
|
980 status = luaD_protectedparser(L, &z, chunkname, mode);
|
|
|
981 if (status == LUA_OK) { /* no errors? */
|
|
|
982 LClosure *f = clLvalue(L->top - 1); /* get newly created function */
|
|
|
983 if (f->nupvalues == 1) { /* does it have one upvalue? */
|
|
|
984 /* get global table from registry */
|
|
|
985 Table *reg = hvalue(&G(L)->l_registry);
|
|
|
986 const TValue *gt = luaH_getint(reg, LUA_RIDX_GLOBALS);
|
|
|
987 /* set global table as 1st upvalue of 'f' (may be LUA_ENV) */
|
|
|
988 setobj(L, f->upvals[0]->v, gt);
|
|
|
989 luaC_barrier(L, f->upvals[0], gt);
|
|
|
990 }
|
|
|
991 }
|
|
|
992 lua_unlock(L);
|
|
|
993 return status;
|
|
|
994 }
|
|
|
995
|
|
|
996
|
|
|
997 LUA_API int lua_dump (lua_State *L, lua_Writer writer, void *data) {
|
|
|
998 int status;
|
|
|
999 TValue *o;
|
|
|
1000 lua_lock(L);
|
|
|
1001 api_checknelems(L, 1);
|
|
|
1002 o = L->top - 1;
|
|
|
1003 if (isLfunction(o))
|
|
|
1004 status = luaU_dump(L, getproto(o), writer, data, 0);
|
|
|
1005 else
|
|
|
1006 status = 1;
|
|
|
1007 lua_unlock(L);
|
|
|
1008 return status;
|
|
|
1009 }
|
|
|
1010
|
|
|
1011
|
|
|
1012 LUA_API int lua_status (lua_State *L) {
|
|
|
1013 return L->status;
|
|
|
1014 }
|
|
|
1015
|
|
|
1016
|
|
|
1017 /*
|
|
|
1018 ** Garbage-collection function
|
|
|
1019 */
|
|
|
1020
|
|
|
1021 LUA_API int lua_gc (lua_State *L, int what, int data) {
|
|
|
1022 int res = 0;
|
|
|
1023 global_State *g;
|
|
|
1024 lua_lock(L);
|
|
|
1025 g = G(L);
|
|
|
1026 switch (what) {
|
|
|
1027 case LUA_GCSTOP: {
|
|
|
1028 g->gcrunning = 0;
|
|
|
1029 break;
|
|
|
1030 }
|
|
|
1031 case LUA_GCRESTART: {
|
|
|
1032 luaE_setdebt(g, 0);
|
|
|
1033 g->gcrunning = 1;
|
|
|
1034 break;
|
|
|
1035 }
|
|
|
1036 case LUA_GCCOLLECT: {
|
|
|
1037 luaC_fullgc(L, 0);
|
|
|
1038 break;
|
|
|
1039 }
|
|
|
1040 case LUA_GCCOUNT: {
|
|
|
1041 /* GC values are expressed in Kbytes: #bytes/2^10 */
|
|
|
1042 res = cast_int(gettotalbytes(g) >> 10);
|
|
|
1043 break;
|
|
|
1044 }
|
|
|
1045 case LUA_GCCOUNTB: {
|
|
|
1046 res = cast_int(gettotalbytes(g) & 0x3ff);
|
|
|
1047 break;
|
|
|
1048 }
|
|
|
1049 case LUA_GCSTEP: {
|
|
|
1050 if (g->gckind == KGC_GEN) { /* generational mode? */
|
|
|
1051 res = (g->GCestimate == 0); /* true if it will do major collection */
|
|
|
1052 luaC_forcestep(L); /* do a single step */
|
|
|
1053 }
|
|
|
1054 else {
|
|
|
1055 lu_mem debt = cast(lu_mem, data) * 1024 - GCSTEPSIZE;
|
|
|
1056 if (g->gcrunning)
|
|
|
1057 debt += g->GCdebt; /* include current debt */
|
|
|
1058 luaE_setdebt(g, debt);
|
|
|
1059 luaC_forcestep(L);
|
|
|
1060 if (g->gcstate == GCSpause) /* end of cycle? */
|
|
|
1061 res = 1; /* signal it */
|
|
|
1062 }
|
|
|
1063 break;
|
|
|
1064 }
|
|
|
1065 case LUA_GCSETPAUSE: {
|
|
|
1066 res = g->gcpause;
|
|
|
1067 g->gcpause = data;
|
|
|
1068 break;
|
|
|
1069 }
|
|
|
1070 case LUA_GCSETMAJORINC: {
|
|
|
1071 res = g->gcmajorinc;
|
|
|
1072 g->gcmajorinc = data;
|
|
|
1073 break;
|
|
|
1074 }
|
|
|
1075 case LUA_GCSETSTEPMUL: {
|
|
|
1076 res = g->gcstepmul;
|
|
|
1077 g->gcstepmul = data;
|
|
|
1078 break;
|
|
|
1079 }
|
|
|
1080 case LUA_GCISRUNNING: {
|
|
|
1081 res = g->gcrunning;
|
|
|
1082 break;
|
|
|
1083 }
|
|
|
1084 case LUA_GCGEN: { /* change collector to generational mode */
|
|
|
1085 luaC_changemode(L, KGC_GEN);
|
|
|
1086 break;
|
|
|
1087 }
|
|
|
1088 case LUA_GCINC: { /* change collector to incremental mode */
|
|
|
1089 luaC_changemode(L, KGC_NORMAL);
|
|
|
1090 break;
|
|
|
1091 }
|
|
|
1092 default: res = -1; /* invalid option */
|
|
|
1093 }
|
|
|
1094 lua_unlock(L);
|
|
|
1095 return res;
|
|
|
1096 }
|
|
|
1097
|
|
|
1098
|
|
|
1099
|
|
|
1100 /*
|
|
|
1101 ** miscellaneous functions
|
|
|
1102 */
|
|
|
1103
|
|
|
1104
|
|
|
1105 LUA_API int lua_error (lua_State *L) {
|
|
|
1106 lua_lock(L);
|
|
|
1107 api_checknelems(L, 1);
|
|
|
1108 luaG_errormsg(L);
|
|
|
1109 /* code unreachable; will unlock when control actually leaves the kernel */
|
|
|
1110 return 0; /* to avoid warnings */
|
|
|
1111 }
|
|
|
1112
|
|
|
1113
|
|
|
1114 LUA_API int lua_next (lua_State *L, int idx) {
|
|
|
1115 StkId t;
|
|
|
1116 int more;
|
|
|
1117 lua_lock(L);
|
|
|
1118 t = index2addr(L, idx);
|
|
|
1119 api_check(L, ttistable(t), "table expected");
|
|
|
1120 more = luaH_next(L, hvalue(t), L->top - 1);
|
|
|
1121 if (more) {
|
|
|
1122 api_incr_top(L);
|
|
|
1123 }
|
|
|
1124 else /* no more elements */
|
|
|
1125 L->top -= 1; /* remove key */
|
|
|
1126 lua_unlock(L);
|
|
|
1127 return more;
|
|
|
1128 }
|
|
|
1129
|
|
|
1130
|
|
|
1131 LUA_API void lua_concat (lua_State *L, int n) {
|
|
|
1132 lua_lock(L);
|
|
|
1133 api_checknelems(L, n);
|
|
|
1134 if (n >= 2) {
|
|
|
1135 luaC_checkGC(L);
|
|
|
1136 luaV_concat(L, n);
|
|
|
1137 }
|
|
|
1138 else if (n == 0) { /* push empty string */
|
|
|
1139 setsvalue2s(L, L->top, luaS_newlstr(L, "", 0));
|
|
|
1140 api_incr_top(L);
|
|
|
1141 }
|
|
|
1142 /* else n == 1; nothing to do */
|
|
|
1143 lua_unlock(L);
|
|
|
1144 }
|
|
|
1145
|
|
|
1146
|
|
|
1147 LUA_API void lua_len (lua_State *L, int idx) {
|
|
|
1148 StkId t;
|
|
|
1149 lua_lock(L);
|
|
|
1150 t = index2addr(L, idx);
|
|
|
1151 luaV_objlen(L, L->top, t);
|
|
|
1152 api_incr_top(L);
|
|
|
1153 lua_unlock(L);
|
|
|
1154 }
|
|
|
1155
|
|
|
1156
|
|
|
1157 LUA_API lua_Alloc lua_getallocf (lua_State *L, void **ud) {
|
|
|
1158 lua_Alloc f;
|
|
|
1159 lua_lock(L);
|
|
|
1160 if (ud) *ud = G(L)->ud;
|
|
|
1161 f = G(L)->frealloc;
|
|
|
1162 lua_unlock(L);
|
|
|
1163 return f;
|
|
|
1164 }
|
|
|
1165
|
|
|
1166
|
|
|
1167 LUA_API void lua_setallocf (lua_State *L, lua_Alloc f, void *ud) {
|
|
|
1168 lua_lock(L);
|
|
|
1169 G(L)->ud = ud;
|
|
|
1170 G(L)->frealloc = f;
|
|
|
1171 lua_unlock(L);
|
|
|
1172 }
|
|
|
1173
|
|
|
1174
|
|
|
1175 LUA_API void *lua_newuserdata (lua_State *L, size_t size) {
|
|
|
1176 Udata *u;
|
|
|
1177 lua_lock(L);
|
|
|
1178 luaC_checkGC(L);
|
|
|
1179 u = luaS_newudata(L, size, NULL);
|
|
|
1180 setuvalue(L, L->top, u);
|
|
|
1181 api_incr_top(L);
|
|
|
1182 lua_unlock(L);
|
|
|
1183 return u + 1;
|
|
|
1184 }
|
|
|
1185
|
|
|
1186
|
|
|
1187
|
|
|
1188 static const char *aux_upvalue (StkId fi, int n, TValue **val,
|
|
|
1189 GCObject **owner) {
|
|
|
1190 switch (ttype(fi)) {
|
|
|
1191 case LUA_TCCL: { /* C closure */
|
|
|
1192 CClosure *f = clCvalue(fi);
|
|
|
1193 if (!(1 <= n && n <= f->nupvalues)) return NULL;
|
|
|
1194 *val = &f->upvalue[n-1];
|
|
|
1195 if (owner) *owner = obj2gco(f);
|
|
|
1196 return "";
|
|
|
1197 }
|
|
|
1198 case LUA_TLCL: { /* Lua closure */
|
|
|
1199 LClosure *f = clLvalue(fi);
|
|
|
1200 TString *name;
|
|
|
1201 Proto *p = f->p;
|
|
|
1202 if (!(1 <= n && n <= p->sizeupvalues)) return NULL;
|
|
|
1203 *val = f->upvals[n-1]->v;
|
|
|
1204 if (owner) *owner = obj2gco(f->upvals[n - 1]);
|
|
|
1205 name = p->upvalues[n-1].name;
|
|
|
1206 return (name == NULL) ? "" : getstr(name);
|
|
|
1207 }
|
|
|
1208 default: return NULL; /* not a closure */
|
|
|
1209 }
|
|
|
1210 }
|
|
|
1211
|
|
|
1212
|
|
|
1213 LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) {
|
|
|
1214 const char *name;
|
|
|
1215 TValue *val = NULL; /* to avoid warnings */
|
|
|
1216 lua_lock(L);
|
|
|
1217 name = aux_upvalue(index2addr(L, funcindex), n, &val, NULL);
|
|
|
1218 if (name) {
|
|
|
1219 setobj2s(L, L->top, val);
|
|
|
1220 api_incr_top(L);
|
|
|
1221 }
|
|
|
1222 lua_unlock(L);
|
|
|
1223 return name;
|
|
|
1224 }
|
|
|
1225
|
|
|
1226
|
|
|
1227 LUA_API const char *lua_setupvalue (lua_State *L, int funcindex, int n) {
|
|
|
1228 const char *name;
|
|
|
1229 TValue *val = NULL; /* to avoid warnings */
|
|
|
1230 GCObject *owner = NULL; /* to avoid warnings */
|
|
|
1231 StkId fi;
|
|
|
1232 lua_lock(L);
|
|
|
1233 fi = index2addr(L, funcindex);
|
|
|
1234 api_checknelems(L, 1);
|
|
|
1235 name = aux_upvalue(fi, n, &val, &owner);
|
|
|
1236 if (name) {
|
|
|
1237 L->top--;
|
|
|
1238 setobj(L, val, L->top);
|
|
|
1239 luaC_barrier(L, owner, L->top);
|
|
|
1240 }
|
|
|
1241 lua_unlock(L);
|
|
|
1242 return name;
|
|
|
1243 }
|
|
|
1244
|
|
|
1245
|
|
|
1246 static UpVal **getupvalref (lua_State *L, int fidx, int n, LClosure **pf) {
|
|
|
1247 LClosure *f;
|
|
|
1248 StkId fi = index2addr(L, fidx);
|
|
|
1249 api_check(L, ttisLclosure(fi), "Lua function expected");
|
|
|
1250 f = clLvalue(fi);
|
|
|
1251 api_check(L, (1 <= n && n <= f->p->sizeupvalues), "invalid upvalue index");
|
|
|
1252 if (pf) *pf = f;
|
|
|
1253 return &f->upvals[n - 1]; /* get its upvalue pointer */
|
|
|
1254 }
|
|
|
1255
|
|
|
1256
|
|
|
1257 LUA_API void *lua_upvalueid (lua_State *L, int fidx, int n) {
|
|
|
1258 StkId fi = index2addr(L, fidx);
|
|
|
1259 switch (ttype(fi)) {
|
|
|
1260 case LUA_TLCL: { /* lua closure */
|
|
|
1261 return *getupvalref(L, fidx, n, NULL);
|
|
|
1262 }
|
|
|
1263 case LUA_TCCL: { /* C closure */
|
|
|
1264 CClosure *f = clCvalue(fi);
|
|
|
1265 api_check(L, 1 <= n && n <= f->nupvalues, "invalid upvalue index");
|
|
|
1266 return &f->upvalue[n - 1];
|
|
|
1267 }
|
|
|
1268 default: {
|
|
|
1269 api_check(L, 0, "closure expected");
|
|
|
1270 return NULL;
|
|
|
1271 }
|
|
|
1272 }
|
|
|
1273 }
|
|
|
1274
|
|
|
1275
|
|
|
1276 LUA_API void lua_upvaluejoin (lua_State *L, int fidx1, int n1,
|
|
|
1277 int fidx2, int n2) {
|
|
|
1278 LClosure *f1;
|
|
|
1279 UpVal **up1 = getupvalref(L, fidx1, n1, &f1);
|
|
|
1280 UpVal **up2 = getupvalref(L, fidx2, n2, NULL);
|
|
|
1281 *up1 = *up2;
|
|
|
1282 luaC_objbarrier(L, f1, *up2);
|
|
|
1283 }
|
|
|
1284
|
