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comparison src/lua/lapi.c @ 11:27763b933818

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raise lua sources up one level
author Robert McIntyre <rlm@mit.edu>
date Sat, 03 Mar 2012 11:07:39 -0600
parents src/lua/src/lapi.c@f9f4f1b99eed
children
comparison
equal deleted inserted replaced
10:48b74a4e4692 11:27763b933818
1 /*
2 ** $Id: lapi.c,v 2.55.1.5 2008/07/04 18:41:18 roberto Exp $
3 ** Lua API
4 ** See Copyright Notice in lua.h
5 */
6
7
8 #include <assert.h>
9 #include <math.h>
10 #include <stdarg.h>
11 #include <string.h>
12
13 #define lapi_c
14 #define LUA_CORE
15
16 #include "lua.h"
17
18 #include "lapi.h"
19 #include "ldebug.h"
20 #include "ldo.h"
21 #include "lfunc.h"
22 #include "lgc.h"
23 #include "lmem.h"
24 #include "lobject.h"
25 #include "lstate.h"
26 #include "lstring.h"
27 #include "ltable.h"
28 #include "ltm.h"
29 #include "lundump.h"
30 #include "lvm.h"
31
32
33
34 const char lua_ident[] =
35 "$Lua: " LUA_RELEASE " " LUA_COPYRIGHT " $\n"
36 "$Authors: " LUA_AUTHORS " $\n"
37 "$URL: www.lua.org $\n";
38
39
40
41 #define api_checknelems(L, n) api_check(L, (n) <= (L->top - L->base))
42
43 #define api_checkvalidindex(L, i) api_check(L, (i) != luaO_nilobject)
44
45 #define api_incr_top(L) {api_check(L, L->top < L->ci->top); L->top++;}
46
47
48
49 static TValue *index2adr (lua_State *L, int idx) {
50 if (idx > 0) {
51 TValue *o = L->base + (idx - 1);
52 api_check(L, idx <= L->ci->top - L->base);
53 if (o >= L->top) return cast(TValue *, luaO_nilobject);
54 else return o;
55 }
56 else if (idx > LUA_REGISTRYINDEX) {
57 api_check(L, idx != 0 && -idx <= L->top - L->base);
58 return L->top + idx;
59 }
60 else switch (idx) { /* pseudo-indices */
61 case LUA_REGISTRYINDEX: return registry(L);
62 case LUA_ENVIRONINDEX: {
63 Closure *func = curr_func(L);
64 sethvalue(L, &L->env, func->c.env);
65 return &L->env;
66 }
67 case LUA_GLOBALSINDEX: return gt(L);
68 default: {
69 Closure *func = curr_func(L);
70 idx = LUA_GLOBALSINDEX - idx;
71 return (idx <= func->c.nupvalues)
72 ? &func->c.upvalue[idx-1]
73 : cast(TValue *, luaO_nilobject);
74 }
75 }
76 }
77
78
79 static Table *getcurrenv (lua_State *L) {
80 if (L->ci == L->base_ci) /* no enclosing function? */
81 return hvalue(gt(L)); /* use global table as environment */
82 else {
83 Closure *func = curr_func(L);
84 return func->c.env;
85 }
86 }
87
88
89 void luaA_pushobject (lua_State *L, const TValue *o) {
90 setobj2s(L, L->top, o);
91 api_incr_top(L);
92 }
93
94
95 LUA_API int lua_checkstack (lua_State *L, int size) {
96 int res = 1;
97 lua_lock(L);
98 if (size > LUAI_MAXCSTACK || (L->top - L->base + size) > LUAI_MAXCSTACK)
99 res = 0; /* stack overflow */
100 else if (size > 0) {
101 luaD_checkstack(L, size);
102 if (L->ci->top < L->top + size)
103 L->ci->top = L->top + size;
104 }
105 lua_unlock(L);
106 return res;
107 }
108
109
110 LUA_API void lua_xmove (lua_State *from, lua_State *to, int n) {
111 int i;
112 if (from == to) return;
113 lua_lock(to);
114 api_checknelems(from, n);
115 api_check(from, G(from) == G(to));
116 api_check(from, to->ci->top - to->top >= n);
117 from->top -= n;
118 for (i = 0; i < n; i++) {
119 setobj2s(to, to->top++, from->top + i);
120 }
121 lua_unlock(to);
122 }
123
124
125 LUA_API void lua_setlevel (lua_State *from, lua_State *to) {
126 to->nCcalls = from->nCcalls;
127 }
128
129
130 LUA_API lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf) {
131 lua_CFunction old;
132 lua_lock(L);
133 old = G(L)->panic;
134 G(L)->panic = panicf;
135 lua_unlock(L);
136 return old;
137 }
138
139
140 LUA_API lua_State *lua_newthread (lua_State *L) {
141 lua_State *L1;
142 lua_lock(L);
143 luaC_checkGC(L);
144 L1 = luaE_newthread(L);
145 setthvalue(L, L->top, L1);
146 api_incr_top(L);
147 lua_unlock(L);
148 luai_userstatethread(L, L1);
149 return L1;
150 }
151
152
153
154 /*
155 ** basic stack manipulation
156 */
157
158
159 LUA_API int lua_gettop (lua_State *L) {
160 return cast_int(L->top - L->base);
161 }
162
163
164 LUA_API void lua_settop (lua_State *L, int idx) {
165 lua_lock(L);
166 if (idx >= 0) {
167 api_check(L, idx <= L->stack_last - L->base);
168 while (L->top < L->base + idx)
169 setnilvalue(L->top++);
170 L->top = L->base + idx;
171 }
172 else {
173 api_check(L, -(idx+1) <= (L->top - L->base));
174 L->top += idx+1; /* `subtract' index (index is negative) */
175 }
176 lua_unlock(L);
177 }
178
179
180 LUA_API void lua_remove (lua_State *L, int idx) {
181 StkId p;
182 lua_lock(L);
183 p = index2adr(L, idx);
184 api_checkvalidindex(L, p);
185 while (++p < L->top) setobjs2s(L, p-1, p);
186 L->top--;
187 lua_unlock(L);
188 }
189
190
191 LUA_API void lua_insert (lua_State *L, int idx) {
192 StkId p;
193 StkId q;
194 lua_lock(L);
195 p = index2adr(L, idx);
196 api_checkvalidindex(L, p);
197 for (q = L->top; q>p; q--) setobjs2s(L, q, q-1);
198 setobjs2s(L, p, L->top);
199 lua_unlock(L);
200 }
201
202
203 LUA_API void lua_replace (lua_State *L, int idx) {
204 StkId o;
205 lua_lock(L);
206 /* explicit test for incompatible code */
207 if (idx == LUA_ENVIRONINDEX && L->ci == L->base_ci)
208 luaG_runerror(L, "no calling environment");
209 api_checknelems(L, 1);
210 o = index2adr(L, idx);
211 api_checkvalidindex(L, o);
212 if (idx == LUA_ENVIRONINDEX) {
213 Closure *func = curr_func(L);
214 api_check(L, ttistable(L->top - 1));
215 func->c.env = hvalue(L->top - 1);
216 luaC_barrier(L, func, L->top - 1);
217 }
218 else {
219 setobj(L, o, L->top - 1);
220 if (idx < LUA_GLOBALSINDEX) /* function upvalue? */
221 luaC_barrier(L, curr_func(L), L->top - 1);
222 }
223 L->top--;
224 lua_unlock(L);
225 }
226
227
228 LUA_API void lua_pushvalue (lua_State *L, int idx) {
229 lua_lock(L);
230 setobj2s(L, L->top, index2adr(L, idx));
231 api_incr_top(L);
232 lua_unlock(L);
233 }
234
235
236
237 /*
238 ** access functions (stack -> C)
239 */
240
241
242 LUA_API int lua_type (lua_State *L, int idx) {
243 StkId o = index2adr(L, idx);
244 return (o == luaO_nilobject) ? LUA_TNONE : ttype(o);
245 }
246
247
248 LUA_API const char *lua_typename (lua_State *L, int t) {
249 UNUSED(L);
250 return (t == LUA_TNONE) ? "no value" : luaT_typenames[t];
251 }
252
253
254 LUA_API int lua_iscfunction (lua_State *L, int idx) {
255 StkId o = index2adr(L, idx);
256 return iscfunction(o);
257 }
258
259
260 LUA_API int lua_isnumber (lua_State *L, int idx) {
261 TValue n;
262 const TValue *o = index2adr(L, idx);
263 return tonumber(o, &n);
264 }
265
266
267 LUA_API int lua_isstring (lua_State *L, int idx) {
268 int t = lua_type(L, idx);
269 return (t == LUA_TSTRING || t == LUA_TNUMBER);
270 }
271
272
273 LUA_API int lua_isuserdata (lua_State *L, int idx) {
274 const TValue *o = index2adr(L, idx);
275 return (ttisuserdata(o) || ttislightuserdata(o));
276 }
277
278
279 LUA_API int lua_rawequal (lua_State *L, int index1, int index2) {
280 StkId o1 = index2adr(L, index1);
281 StkId o2 = index2adr(L, index2);
282 return (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0
283 : luaO_rawequalObj(o1, o2);
284 }
285
286
287 LUA_API int lua_equal (lua_State *L, int index1, int index2) {
288 StkId o1, o2;
289 int i;
290 lua_lock(L); /* may call tag method */
291 o1 = index2adr(L, index1);
292 o2 = index2adr(L, index2);
293 i = (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0 : equalobj(L, o1, o2);
294 lua_unlock(L);
295 return i;
296 }
297
298
299 LUA_API int lua_lessthan (lua_State *L, int index1, int index2) {
300 StkId o1, o2;
301 int i;
302 lua_lock(L); /* may call tag method */
303 o1 = index2adr(L, index1);
304 o2 = index2adr(L, index2);
305 i = (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0
306 : luaV_lessthan(L, o1, o2);
307 lua_unlock(L);
308 return i;
309 }
310
311
312
313 LUA_API lua_Number lua_tonumber (lua_State *L, int idx) {
314 TValue n;
315 const TValue *o = index2adr(L, idx);
316 if (tonumber(o, &n))
317 return nvalue(o);
318 else
319 return 0;
320 }
321
322
323 LUA_API lua_Integer lua_tointeger (lua_State *L, int idx) {
324 TValue n;
325 const TValue *o = index2adr(L, idx);
326 if (tonumber(o, &n)) {
327 lua_Integer res;
328 lua_Number num = nvalue(o);
329 lua_number2integer(res, num);
330 return res;
331 }
332 else
333 return 0;
334 }
335
336
337 LUA_API int lua_toboolean (lua_State *L, int idx) {
338 const TValue *o = index2adr(L, idx);
339 return !l_isfalse(o);
340 }
341
342
343 LUA_API const char *lua_tolstring (lua_State *L, int idx, size_t *len) {
344 StkId o = index2adr(L, idx);
345 if (!ttisstring(o)) {
346 lua_lock(L); /* `luaV_tostring' may create a new string */
347 if (!luaV_tostring(L, o)) { /* conversion failed? */
348 if (len != NULL) *len = 0;
349 lua_unlock(L);
350 return NULL;
351 }
352 luaC_checkGC(L);
353 o = index2adr(L, idx); /* previous call may reallocate the stack */
354 lua_unlock(L);
355 }
356 if (len != NULL) *len = tsvalue(o)->len;
357 return svalue(o);
358 }
359
360
361 LUA_API size_t lua_objlen (lua_State *L, int idx) {
362 StkId o = index2adr(L, idx);
363 switch (ttype(o)) {
364 case LUA_TSTRING: return tsvalue(o)->len;
365 case LUA_TUSERDATA: return uvalue(o)->len;
366 case LUA_TTABLE: return luaH_getn(hvalue(o));
367 case LUA_TNUMBER: {
368 size_t l;
369 lua_lock(L); /* `luaV_tostring' may create a new string */
370 l = (luaV_tostring(L, o) ? tsvalue(o)->len : 0);
371 lua_unlock(L);
372 return l;
373 }
374 default: return 0;
375 }
376 }
377
378
379 LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx) {
380 StkId o = index2adr(L, idx);
381 return (!iscfunction(o)) ? NULL : clvalue(o)->c.f;
382 }
383
384
385 LUA_API void *lua_touserdata (lua_State *L, int idx) {
386 StkId o = index2adr(L, idx);
387 switch (ttype(o)) {
388 case LUA_TUSERDATA: return (rawuvalue(o) + 1);
389 case LUA_TLIGHTUSERDATA: return pvalue(o);
390 default: return NULL;
391 }
392 }
393
394
395 LUA_API lua_State *lua_tothread (lua_State *L, int idx) {
396 StkId o = index2adr(L, idx);
397 return (!ttisthread(o)) ? NULL : thvalue(o);
398 }
399
400
401 LUA_API const void *lua_topointer (lua_State *L, int idx) {
402 StkId o = index2adr(L, idx);
403 switch (ttype(o)) {
404 case LUA_TTABLE: return hvalue(o);
405 case LUA_TFUNCTION: return clvalue(o);
406 case LUA_TTHREAD: return thvalue(o);
407 case LUA_TUSERDATA:
408 case LUA_TLIGHTUSERDATA:
409 return lua_touserdata(L, idx);
410 default: return NULL;
411 }
412 }
413
414
415
416 /*
417 ** push functions (C -> stack)
418 */
419
420
421 LUA_API void lua_pushnil (lua_State *L) {
422 lua_lock(L);
423 setnilvalue(L->top);
424 api_incr_top(L);
425 lua_unlock(L);
426 }
427
428
429 LUA_API void lua_pushnumber (lua_State *L, lua_Number n) {
430 lua_lock(L);
431 setnvalue(L->top, n);
432 api_incr_top(L);
433 lua_unlock(L);
434 }
435
436
437 LUA_API void lua_pushinteger (lua_State *L, lua_Integer n) {
438 lua_lock(L);
439 setnvalue(L->top, cast_num(n));
440 api_incr_top(L);
441 lua_unlock(L);
442 }
443
444
445 LUA_API void lua_pushlstring (lua_State *L, const char *s, size_t len) {
446 lua_lock(L);
447 luaC_checkGC(L);
448 setsvalue2s(L, L->top, luaS_newlstr(L, s, len));
449 api_incr_top(L);
450 lua_unlock(L);
451 }
452
453
454 LUA_API void lua_pushstring (lua_State *L, const char *s) {
455 if (s == NULL)
456 lua_pushnil(L);
457 else
458 lua_pushlstring(L, s, strlen(s));
459 }
460
461
462 LUA_API const char *lua_pushvfstring (lua_State *L, const char *fmt,
463 va_list argp) {
464 const char *ret;
465 lua_lock(L);
466 luaC_checkGC(L);
467 ret = luaO_pushvfstring(L, fmt, argp);
468 lua_unlock(L);
469 return ret;
470 }
471
472
473 LUA_API const char *lua_pushfstring (lua_State *L, const char *fmt, ...) {
474 const char *ret;
475 va_list argp;
476 lua_lock(L);
477 luaC_checkGC(L);
478 va_start(argp, fmt);
479 ret = luaO_pushvfstring(L, fmt, argp);
480 va_end(argp);
481 lua_unlock(L);
482 return ret;
483 }
484
485
486 LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
487 Closure *cl;
488 lua_lock(L);
489 luaC_checkGC(L);
490 api_checknelems(L, n);
491 cl = luaF_newCclosure(L, n, getcurrenv(L));
492 cl->c.f = fn;
493 L->top -= n;
494 while (n--)
495 setobj2n(L, &cl->c.upvalue[n], L->top+n);
496 setclvalue(L, L->top, cl);
497 lua_assert(iswhite(obj2gco(cl)));
498 api_incr_top(L);
499 lua_unlock(L);
500 }
501
502
503 LUA_API void lua_pushboolean (lua_State *L, int b) {
504 lua_lock(L);
505 setbvalue(L->top, (b != 0)); /* ensure that true is 1 */
506 api_incr_top(L);
507 lua_unlock(L);
508 }
509
510
511 LUA_API void lua_pushlightuserdata (lua_State *L, void *p) {
512 lua_lock(L);
513 setpvalue(L->top, p);
514 api_incr_top(L);
515 lua_unlock(L);
516 }
517
518
519 LUA_API int lua_pushthread (lua_State *L) {
520 lua_lock(L);
521 setthvalue(L, L->top, L);
522 api_incr_top(L);
523 lua_unlock(L);
524 return (G(L)->mainthread == L);
525 }
526
527
528
529 /*
530 ** get functions (Lua -> stack)
531 */
532
533
534 LUA_API void lua_gettable (lua_State *L, int idx) {
535 StkId t;
536 lua_lock(L);
537 t = index2adr(L, idx);
538 api_checkvalidindex(L, t);
539 luaV_gettable(L, t, L->top - 1, L->top - 1);
540 lua_unlock(L);
541 }
542
543
544 LUA_API void lua_getfield (lua_State *L, int idx, const char *k) {
545 StkId t;
546 TValue key;
547 lua_lock(L);
548 t = index2adr(L, idx);
549 api_checkvalidindex(L, t);
550 setsvalue(L, &key, luaS_new(L, k));
551 luaV_gettable(L, t, &key, L->top);
552 api_incr_top(L);
553 lua_unlock(L);
554 }
555
556
557 LUA_API void lua_rawget (lua_State *L, int idx) {
558 StkId t;
559 lua_lock(L);
560 t = index2adr(L, idx);
561 api_check(L, ttistable(t));
562 setobj2s(L, L->top - 1, luaH_get(hvalue(t), L->top - 1));
563 lua_unlock(L);
564 }
565
566
567 LUA_API void lua_rawgeti (lua_State *L, int idx, int n) {
568 StkId o;
569 lua_lock(L);
570 o = index2adr(L, idx);
571 api_check(L, ttistable(o));
572 setobj2s(L, L->top, luaH_getnum(hvalue(o), n));
573 api_incr_top(L);
574 lua_unlock(L);
575 }
576
577
578 LUA_API void lua_createtable (lua_State *L, int narray, int nrec) {
579 lua_lock(L);
580 luaC_checkGC(L);
581 sethvalue(L, L->top, luaH_new(L, narray, nrec));
582 api_incr_top(L);
583 lua_unlock(L);
584 }
585
586
587 LUA_API int lua_getmetatable (lua_State *L, int objindex) {
588 const TValue *obj;
589 Table *mt = NULL;
590 int res;
591 lua_lock(L);
592 obj = index2adr(L, objindex);
593 switch (ttype(obj)) {
594 case LUA_TTABLE:
595 mt = hvalue(obj)->metatable;
596 break;
597 case LUA_TUSERDATA:
598 mt = uvalue(obj)->metatable;
599 break;
600 default:
601 mt = G(L)->mt[ttype(obj)];
602 break;
603 }
604 if (mt == NULL)
605 res = 0;
606 else {
607 sethvalue(L, L->top, mt);
608 api_incr_top(L);
609 res = 1;
610 }
611 lua_unlock(L);
612 return res;
613 }
614
615
616 LUA_API void lua_getfenv (lua_State *L, int idx) {
617 StkId o;
618 lua_lock(L);
619 o = index2adr(L, idx);
620 api_checkvalidindex(L, o);
621 switch (ttype(o)) {
622 case LUA_TFUNCTION:
623 sethvalue(L, L->top, clvalue(o)->c.env);
624 break;
625 case LUA_TUSERDATA:
626 sethvalue(L, L->top, uvalue(o)->env);
627 break;
628 case LUA_TTHREAD:
629 setobj2s(L, L->top, gt(thvalue(o)));
630 break;
631 default:
632 setnilvalue(L->top);
633 break;
634 }
635 api_incr_top(L);
636 lua_unlock(L);
637 }
638
639
640 /*
641 ** set functions (stack -> Lua)
642 */
643
644
645 LUA_API void lua_settable (lua_State *L, int idx) {
646 StkId t;
647 lua_lock(L);
648 api_checknelems(L, 2);
649 t = index2adr(L, idx);
650 api_checkvalidindex(L, t);
651 luaV_settable(L, t, L->top - 2, L->top - 1);
652 L->top -= 2; /* pop index and value */
653 lua_unlock(L);
654 }
655
656
657 LUA_API void lua_setfield (lua_State *L, int idx, const char *k) {
658 StkId t;
659 TValue key;
660 lua_lock(L);
661 api_checknelems(L, 1);
662 t = index2adr(L, idx);
663 api_checkvalidindex(L, t);
664 setsvalue(L, &key, luaS_new(L, k));
665 luaV_settable(L, t, &key, L->top - 1);
666 L->top--; /* pop value */
667 lua_unlock(L);
668 }
669
670
671 LUA_API void lua_rawset (lua_State *L, int idx) {
672 StkId t;
673 lua_lock(L);
674 api_checknelems(L, 2);
675 t = index2adr(L, idx);
676 api_check(L, ttistable(t));
677 setobj2t(L, luaH_set(L, hvalue(t), L->top-2), L->top-1);
678 luaC_barriert(L, hvalue(t), L->top-1);
679 L->top -= 2;
680 lua_unlock(L);
681 }
682
683
684 LUA_API void lua_rawseti (lua_State *L, int idx, int n) {
685 StkId o;
686 lua_lock(L);
687 api_checknelems(L, 1);
688 o = index2adr(L, idx);
689 api_check(L, ttistable(o));
690 setobj2t(L, luaH_setnum(L, hvalue(o), n), L->top-1);
691 luaC_barriert(L, hvalue(o), L->top-1);
692 L->top--;
693 lua_unlock(L);
694 }
695
696
697 LUA_API int lua_setmetatable (lua_State *L, int objindex) {
698 TValue *obj;
699 Table *mt;
700 lua_lock(L);
701 api_checknelems(L, 1);
702 obj = index2adr(L, objindex);
703 api_checkvalidindex(L, obj);
704 if (ttisnil(L->top - 1))
705 mt = NULL;
706 else {
707 api_check(L, ttistable(L->top - 1));
708 mt = hvalue(L->top - 1);
709 }
710 switch (ttype(obj)) {
711 case LUA_TTABLE: {
712 hvalue(obj)->metatable = mt;
713 if (mt)
714 luaC_objbarriert(L, hvalue(obj), mt);
715 break;
716 }
717 case LUA_TUSERDATA: {
718 uvalue(obj)->metatable = mt;
719 if (mt)
720 luaC_objbarrier(L, rawuvalue(obj), mt);
721 break;
722 }
723 default: {
724 G(L)->mt[ttype(obj)] = mt;
725 break;
726 }
727 }
728 L->top--;
729 lua_unlock(L);
730 return 1;
731 }
732
733
734 LUA_API int lua_setfenv (lua_State *L, int idx) {
735 StkId o;
736 int res = 1;
737 lua_lock(L);
738 api_checknelems(L, 1);
739 o = index2adr(L, idx);
740 api_checkvalidindex(L, o);
741 api_check(L, ttistable(L->top - 1));
742 switch (ttype(o)) {
743 case LUA_TFUNCTION:
744 clvalue(o)->c.env = hvalue(L->top - 1);
745 break;
746 case LUA_TUSERDATA:
747 uvalue(o)->env = hvalue(L->top - 1);
748 break;
749 case LUA_TTHREAD:
750 sethvalue(L, gt(thvalue(o)), hvalue(L->top - 1));
751 break;
752 default:
753 res = 0;
754 break;
755 }
756 if (res) luaC_objbarrier(L, gcvalue(o), hvalue(L->top - 1));
757 L->top--;
758 lua_unlock(L);
759 return res;
760 }
761
762
763 /*
764 ** `load' and `call' functions (run Lua code)
765 */
766
767
768 #define adjustresults(L,nres) \
769 { if (nres == LUA_MULTRET && L->top >= L->ci->top) L->ci->top = L->top; }
770
771
772 #define checkresults(L,na,nr) \
773 api_check(L, (nr) == LUA_MULTRET || (L->ci->top - L->top >= (nr) - (na)))
774
775
776 LUA_API void lua_call (lua_State *L, int nargs, int nresults) {
777 StkId func;
778 lua_lock(L);
779 api_checknelems(L, nargs+1);
780 checkresults(L, nargs, nresults);
781 func = L->top - (nargs+1);
782 luaD_call(L, func, nresults);
783 adjustresults(L, nresults);
784 lua_unlock(L);
785 }
786
787
788
789 /*
790 ** Execute a protected call.
791 */
792 struct CallS { /* data to `f_call' */
793 StkId func;
794 int nresults;
795 };
796
797
798 static void f_call (lua_State *L, void *ud) {
799 struct CallS *c = cast(struct CallS *, ud);
800 luaD_call(L, c->func, c->nresults);
801 }
802
803
804
805 LUA_API int lua_pcall (lua_State *L, int nargs, int nresults, int errfunc) {
806 struct CallS c;
807 int status;
808 ptrdiff_t func;
809 lua_lock(L);
810 api_checknelems(L, nargs+1);
811 checkresults(L, nargs, nresults);
812 if (errfunc == 0)
813 func = 0;
814 else {
815 StkId o = index2adr(L, errfunc);
816 api_checkvalidindex(L, o);
817 func = savestack(L, o);
818 }
819 c.func = L->top - (nargs+1); /* function to be called */
820 c.nresults = nresults;
821 status = luaD_pcall(L, f_call, &c, savestack(L, c.func), func);
822 adjustresults(L, nresults);
823 lua_unlock(L);
824 return status;
825 }
826
827
828 /*
829 ** Execute a protected C call.
830 */
831 struct CCallS { /* data to `f_Ccall' */
832 lua_CFunction func;
833 void *ud;
834 };
835
836
837 static void f_Ccall (lua_State *L, void *ud) {
838 struct CCallS *c = cast(struct CCallS *, ud);
839 Closure *cl;
840 cl = luaF_newCclosure(L, 0, getcurrenv(L));
841 cl->c.f = c->func;
842 setclvalue(L, L->top, cl); /* push function */
843 api_incr_top(L);
844 setpvalue(L->top, c->ud); /* push only argument */
845 api_incr_top(L);
846 luaD_call(L, L->top - 2, 0);
847 }
848
849
850 LUA_API int lua_cpcall (lua_State *L, lua_CFunction func, void *ud) {
851 struct CCallS c;
852 int status;
853 lua_lock(L);
854 c.func = func;
855 c.ud = ud;
856 status = luaD_pcall(L, f_Ccall, &c, savestack(L, L->top), 0);
857 lua_unlock(L);
858 return status;
859 }
860
861
862 LUA_API int lua_load (lua_State *L, lua_Reader reader, void *data,
863 const char *chunkname) {
864 ZIO z;
865 int status;
866 lua_lock(L);
867 if (!chunkname) chunkname = "?";
868 luaZ_init(L, &z, reader, data);
869 status = luaD_protectedparser(L, &z, chunkname);
870 lua_unlock(L);
871 return status;
872 }
873
874
875 LUA_API int lua_dump (lua_State *L, lua_Writer writer, void *data) {
876 int status;
877 TValue *o;
878 lua_lock(L);
879 api_checknelems(L, 1);
880 o = L->top - 1;
881 if (isLfunction(o))
882 status = luaU_dump(L, clvalue(o)->l.p, writer, data, 0);
883 else
884 status = 1;
885 lua_unlock(L);
886 return status;
887 }
888
889
890 LUA_API int lua_status (lua_State *L) {
891 return L->status;
892 }
893
894
895 /*
896 ** Garbage-collection function
897 */
898
899 LUA_API int lua_gc (lua_State *L, int what, int data) {
900 int res = 0;
901 global_State *g;
902 lua_lock(L);
903 g = G(L);
904 switch (what) {
905 case LUA_GCSTOP: {
906 g->GCthreshold = MAX_LUMEM;
907 break;
908 }
909 case LUA_GCRESTART: {
910 g->GCthreshold = g->totalbytes;
911 break;
912 }
913 case LUA_GCCOLLECT: {
914 luaC_fullgc(L);
915 break;
916 }
917 case LUA_GCCOUNT: {
918 /* GC values are expressed in Kbytes: #bytes/2^10 */
919 res = cast_int(g->totalbytes >> 10);
920 break;
921 }
922 case LUA_GCCOUNTB: {
923 res = cast_int(g->totalbytes & 0x3ff);
924 break;
925 }
926 case LUA_GCSTEP: {
927 lu_mem a = (cast(lu_mem, data) << 10);
928 if (a <= g->totalbytes)
929 g->GCthreshold = g->totalbytes - a;
930 else
931 g->GCthreshold = 0;
932 while (g->GCthreshold <= g->totalbytes) {
933 luaC_step(L);
934 if (g->gcstate == GCSpause) { /* end of cycle? */
935 res = 1; /* signal it */
936 break;
937 }
938 }
939 break;
940 }
941 case LUA_GCSETPAUSE: {
942 res = g->gcpause;
943 g->gcpause = data;
944 break;
945 }
946 case LUA_GCSETSTEPMUL: {
947 res = g->gcstepmul;
948 g->gcstepmul = data;
949 break;
950 }
951 default: res = -1; /* invalid option */
952 }
953 lua_unlock(L);
954 return res;
955 }
956
957
958
959 /*
960 ** miscellaneous functions
961 */
962
963
964 LUA_API int lua_error (lua_State *L) {
965 lua_lock(L);
966 api_checknelems(L, 1);
967 luaG_errormsg(L);
968 lua_unlock(L);
969 return 0; /* to avoid warnings */
970 }
971
972
973 LUA_API int lua_next (lua_State *L, int idx) {
974 StkId t;
975 int more;
976 lua_lock(L);
977 t = index2adr(L, idx);
978 api_check(L, ttistable(t));
979 more = luaH_next(L, hvalue(t), L->top - 1);
980 if (more) {
981 api_incr_top(L);
982 }
983 else /* no more elements */
984 L->top -= 1; /* remove key */
985 lua_unlock(L);
986 return more;
987 }
988
989
990 LUA_API void lua_concat (lua_State *L, int n) {
991 lua_lock(L);
992 api_checknelems(L, n);
993 if (n >= 2) {
994 luaC_checkGC(L);
995 luaV_concat(L, n, cast_int(L->top - L->base) - 1);
996 L->top -= (n-1);
997 }
998 else if (n == 0) { /* push empty string */
999 setsvalue2s(L, L->top, luaS_newlstr(L, "", 0));
1000 api_incr_top(L);
1001 }
1002 /* else n == 1; nothing to do */
1003 lua_unlock(L);
1004 }
1005
1006
1007 LUA_API lua_Alloc lua_getallocf (lua_State *L, void **ud) {
1008 lua_Alloc f;
1009 lua_lock(L);
1010 if (ud) *ud = G(L)->ud;
1011 f = G(L)->frealloc;
1012 lua_unlock(L);
1013 return f;
1014 }
1015
1016
1017 LUA_API void lua_setallocf (lua_State *L, lua_Alloc f, void *ud) {
1018 lua_lock(L);
1019 G(L)->ud = ud;
1020 G(L)->frealloc = f;
1021 lua_unlock(L);
1022 }
1023
1024
1025 LUA_API void *lua_newuserdata (lua_State *L, size_t size) {
1026 Udata *u;
1027 lua_lock(L);
1028 luaC_checkGC(L);
1029 u = luaS_newudata(L, size, getcurrenv(L));
1030 setuvalue(L, L->top, u);
1031 api_incr_top(L);
1032 lua_unlock(L);
1033 return u + 1;
1034 }
1035
1036
1037
1038
1039 static const char *aux_upvalue (StkId fi, int n, TValue **val) {
1040 Closure *f;
1041 if (!ttisfunction(fi)) return NULL;
1042 f = clvalue(fi);
1043 if (f->c.isC) {
1044 if (!(1 <= n && n <= f->c.nupvalues)) return NULL;
1045 *val = &f->c.upvalue[n-1];
1046 return "";
1047 }
1048 else {
1049 Proto *p = f->l.p;
1050 if (!(1 <= n && n <= p->sizeupvalues)) return NULL;
1051 *val = f->l.upvals[n-1]->v;
1052 return getstr(p->upvalues[n-1]);
1053 }
1054 }
1055
1056
1057 LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) {
1058 const char *name;
1059 TValue *val;
1060 lua_lock(L);
1061 name = aux_upvalue(index2adr(L, funcindex), n, &val);
1062 if (name) {
1063 setobj2s(L, L->top, val);
1064 api_incr_top(L);
1065 }
1066 lua_unlock(L);
1067 return name;
1068 }
1069
1070
1071 LUA_API const char *lua_setupvalue (lua_State *L, int funcindex, int n) {
1072 const char *name;
1073 TValue *val;
1074 StkId fi;
1075 lua_lock(L);
1076 fi = index2adr(L, funcindex);
1077 api_checknelems(L, 1);
1078 name = aux_upvalue(fi, n, &val);
1079 if (name) {
1080 L->top--;
1081 setobj(L, val, L->top);
1082 luaC_barrier(L, clvalue(fi), L->top);
1083 }
1084 lua_unlock(L);
1085 return name;
1086 }
1087