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-rw-r--r--lapi.c1080
1 files changed, 0 insertions, 1080 deletions
diff --git a/lapi.c b/lapi.c
deleted file mode 100644
index 0fa66eb4..00000000
--- a/lapi.c
+++ /dev/null
@@ -1,1080 +0,0 @@
1/*
2** $Id: lapi.c,v 2.54 2006/06/02 15:34:00 roberto Exp roberto $
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
34const 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
49static 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
79static 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
89void luaA_pushobject (lua_State *L, const TValue *o) {
90 setobj2s(L, L->top, o);
91 api_incr_top(L);
92}
93
94
95LUA_API int lua_checkstack (lua_State *L, int size) {
96 int res;
97 lua_lock(L);
98 if ((L->top - L->base + size) > LUAI_MAXCSTACK)
99 res = 0; /* stack overflow */
100 else {
101 luaD_checkstack(L, size);
102 if (L->ci->top < L->top + size)
103 L->ci->top = L->top + size;
104 res = 1;
105 }
106 lua_unlock(L);
107 return res;
108}
109
110
111LUA_API void lua_xmove (lua_State *from, lua_State *to, int n) {
112 int i;
113 if (from == to) return;
114 lua_lock(to);
115 api_checknelems(from, n);
116 api_check(from, G(from) == G(to));
117 api_check(from, to->ci->top - to->top >= n);
118 from->top -= n;
119 for (i = 0; i < n; i++) {
120 setobj2s(to, to->top++, from->top + i);
121 }
122 lua_unlock(to);
123}
124
125
126LUA_API lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf) {
127 lua_CFunction old;
128 lua_lock(L);
129 old = G(L)->panic;
130 G(L)->panic = panicf;
131 lua_unlock(L);
132 return old;
133}
134
135
136LUA_API lua_State *lua_newthread (lua_State *L) {
137 lua_State *L1;
138 lua_lock(L);
139 luaC_checkGC(L);
140 L1 = luaE_newthread(L);
141 setthvalue(L, L->top, L1);
142 api_incr_top(L);
143 lua_unlock(L);
144 luai_userstatethread(L, L1);
145 return L1;
146}
147
148
149
150/*
151** basic stack manipulation
152*/
153
154
155LUA_API int lua_gettop (lua_State *L) {
156 return cast_int(L->top - L->base);
157}
158
159
160LUA_API void lua_settop (lua_State *L, int idx) {
161 lua_lock(L);
162 if (idx >= 0) {
163 api_check(L, idx <= L->stack_last - L->base);
164 while (L->top < L->base + idx)
165 setnilvalue(L->top++);
166 L->top = L->base + idx;
167 }
168 else {
169 api_check(L, -(idx+1) <= (L->top - L->base));
170 L->top += idx+1; /* `subtract' index (index is negative) */
171 }
172 lua_unlock(L);
173}
174
175
176LUA_API void lua_remove (lua_State *L, int idx) {
177 StkId p;
178 lua_lock(L);
179 p = index2adr(L, idx);
180 api_checkvalidindex(L, p);
181 while (++p < L->top) setobjs2s(L, p-1, p);
182 L->top--;
183 lua_unlock(L);
184}
185
186
187LUA_API void lua_insert (lua_State *L, int idx) {
188 StkId p;
189 StkId q;
190 lua_lock(L);
191 p = index2adr(L, idx);
192 api_checkvalidindex(L, p);
193 for (q = L->top; q>p; q--) setobjs2s(L, q, q-1);
194 setobjs2s(L, p, L->top);
195 lua_unlock(L);
196}
197
198
199LUA_API void lua_replace (lua_State *L, int idx) {
200 StkId o;
201 lua_lock(L);
202 /* explicit test for incompatible code */
203 if (idx == LUA_ENVIRONINDEX && L->ci == L->base_ci)
204 luaG_runerror(L, "no calling environment");
205 api_checknelems(L, 1);
206 o = index2adr(L, idx);
207 api_checkvalidindex(L, o);
208 if (idx == LUA_ENVIRONINDEX) {
209 Closure *func = curr_func(L);
210 api_check(L, ttistable(L->top - 1));
211 func->c.env = hvalue(L->top - 1);
212 luaC_barrier(L, func, L->top - 1);
213 }
214 else {
215 setobj(L, o, L->top - 1);
216 if (idx < LUA_GLOBALSINDEX) /* function upvalue? */
217 luaC_barrier(L, curr_func(L), L->top - 1);
218 }
219 L->top--;
220 lua_unlock(L);
221}
222
223
224LUA_API void lua_pushvalue (lua_State *L, int idx) {
225 lua_lock(L);
226 setobj2s(L, L->top, index2adr(L, idx));
227 api_incr_top(L);
228 lua_unlock(L);
229}
230
231
232
233/*
234** access functions (stack -> C)
235*/
236
237
238LUA_API int lua_type (lua_State *L, int idx) {
239 StkId o = index2adr(L, idx);
240 return (o == luaO_nilobject) ? LUA_TNONE : ttype(o);
241}
242
243
244LUA_API const char *lua_typename (lua_State *L, int t) {
245 UNUSED(L);
246 return (t == LUA_TNONE) ? "no value" : luaT_typenames[t];
247}
248
249
250LUA_API int lua_iscfunction (lua_State *L, int idx) {
251 StkId o = index2adr(L, idx);
252 return iscfunction(o);
253}
254
255
256LUA_API int lua_isnumber (lua_State *L, int idx) {
257 TValue n;
258 const TValue *o = index2adr(L, idx);
259 return tonumber(o, &n);
260}
261
262
263LUA_API int lua_isstring (lua_State *L, int idx) {
264 int t = lua_type(L, idx);
265 return (t == LUA_TSTRING || t == LUA_TNUMBER);
266}
267
268
269LUA_API int lua_isuserdata (lua_State *L, int idx) {
270 const TValue *o = index2adr(L, idx);
271 return (ttisuserdata(o) || ttislightuserdata(o));
272}
273
274
275LUA_API int lua_rawequal (lua_State *L, int index1, int index2) {
276 StkId o1 = index2adr(L, index1);
277 StkId o2 = index2adr(L, index2);
278 return (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0
279 : luaO_rawequalObj(o1, o2);
280}
281
282
283LUA_API int lua_equal (lua_State *L, int index1, int index2) {
284 StkId o1, o2;
285 int i;
286 lua_lock(L); /* may call tag method */
287 o1 = index2adr(L, index1);
288 o2 = index2adr(L, index2);
289 i = (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0 : equalobj(L, o1, o2);
290 lua_unlock(L);
291 return i;
292}
293
294
295LUA_API int lua_lessthan (lua_State *L, int index1, int index2) {
296 StkId o1, o2;
297 int i;
298 lua_lock(L); /* may call tag method */
299 o1 = index2adr(L, index1);
300 o2 = index2adr(L, index2);
301 i = (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0
302 : luaV_lessthan(L, o1, o2);
303 lua_unlock(L);
304 return i;
305}
306
307
308
309LUA_API lua_Number lua_tonumber (lua_State *L, int idx) {
310 TValue n;
311 const TValue *o = index2adr(L, idx);
312 if (tonumber(o, &n))
313 return nvalue(o);
314 else
315 return 0;
316}
317
318
319LUA_API lua_Integer lua_tointeger (lua_State *L, int idx) {
320 TValue n;
321 const TValue *o = index2adr(L, idx);
322 if (tonumber(o, &n)) {
323 lua_Integer res;
324 lua_Number num = nvalue(o);
325 lua_number2integer(res, num);
326 return res;
327 }
328 else
329 return 0;
330}
331
332
333LUA_API int lua_toboolean (lua_State *L, int idx) {
334 const TValue *o = index2adr(L, idx);
335 return !l_isfalse(o);
336}
337
338
339LUA_API const char *lua_tolstring (lua_State *L, int idx, size_t *len) {
340 StkId o = index2adr(L, idx);
341 if (!ttisstring(o)) {
342 lua_lock(L); /* `luaV_tostring' may create a new string */
343 if (!luaV_tostring(L, o)) { /* conversion failed? */
344 if (len != NULL) *len = 0;
345 lua_unlock(L);
346 return NULL;
347 }
348 luaC_checkGC(L);
349 o = index2adr(L, idx); /* previous call may reallocate the stack */
350 lua_unlock(L);
351 }
352 if (len != NULL) *len = tsvalue(o)->len;
353 return svalue(o);
354}
355
356
357LUA_API size_t lua_objlen (lua_State *L, int idx) {
358 StkId o = index2adr(L, idx);
359 switch (ttype(o)) {
360 case LUA_TSTRING: return tsvalue(o)->len;
361 case LUA_TUSERDATA: return uvalue(o)->len;
362 case LUA_TTABLE: return luaH_getn(hvalue(o));
363 case LUA_TNUMBER: {
364 size_t l;
365 lua_lock(L); /* `luaV_tostring' may create a new string */
366 l = (luaV_tostring(L, o) ? tsvalue(o)->len : 0);
367 lua_unlock(L);
368 return l;
369 }
370 default: return 0;
371 }
372}
373
374
375LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx) {
376 StkId o = index2adr(L, idx);
377 return (!iscfunction(o)) ? NULL : clvalue(o)->c.f;
378}
379
380
381LUA_API void *lua_touserdata (lua_State *L, int idx) {
382 StkId o = index2adr(L, idx);
383 switch (ttype(o)) {
384 case LUA_TUSERDATA: return (rawuvalue(o) + 1);
385 case LUA_TLIGHTUSERDATA: return pvalue(o);
386 default: return NULL;
387 }
388}
389
390
391LUA_API lua_State *lua_tothread (lua_State *L, int idx) {
392 StkId o = index2adr(L, idx);
393 return (!ttisthread(o)) ? NULL : thvalue(o);
394}
395
396
397LUA_API const void *lua_topointer (lua_State *L, int idx) {
398 StkId o = index2adr(L, idx);
399 switch (ttype(o)) {
400 case LUA_TTABLE: return hvalue(o);
401 case LUA_TFUNCTION: return clvalue(o);
402 case LUA_TTHREAD: return thvalue(o);
403 case LUA_TUSERDATA:
404 case LUA_TLIGHTUSERDATA:
405 return lua_touserdata(L, idx);
406 default: return NULL;
407 }
408}
409
410
411
412/*
413** push functions (C -> stack)
414*/
415
416
417LUA_API void lua_pushnil (lua_State *L) {
418 lua_lock(L);
419 setnilvalue(L->top);
420 api_incr_top(L);
421 lua_unlock(L);
422}
423
424
425LUA_API void lua_pushnumber (lua_State *L, lua_Number n) {
426 lua_lock(L);
427 setnvalue(L->top, n);
428 api_incr_top(L);
429 lua_unlock(L);
430}
431
432
433LUA_API void lua_pushinteger (lua_State *L, lua_Integer n) {
434 lua_lock(L);
435 setnvalue(L->top, cast_num(n));
436 api_incr_top(L);
437 lua_unlock(L);
438}
439
440
441LUA_API void lua_pushlstring (lua_State *L, const char *s, size_t len) {
442 lua_lock(L);
443 luaC_checkGC(L);
444 setsvalue2s(L, L->top, luaS_newlstr(L, s, len));
445 api_incr_top(L);
446 lua_unlock(L);
447}
448
449
450LUA_API void lua_pushstring (lua_State *L, const char *s) {
451 if (s == NULL)
452 lua_pushnil(L);
453 else
454 lua_pushlstring(L, s, strlen(s));
455}
456
457
458LUA_API const char *lua_pushvfstring (lua_State *L, const char *fmt,
459 va_list argp) {
460 const char *ret;
461 lua_lock(L);
462 luaC_checkGC(L);
463 ret = luaO_pushvfstring(L, fmt, argp);
464 lua_unlock(L);
465 return ret;
466}
467
468
469LUA_API const char *lua_pushfstring (lua_State *L, const char *fmt, ...) {
470 const char *ret;
471 va_list argp;
472 lua_lock(L);
473 luaC_checkGC(L);
474 va_start(argp, fmt);
475 ret = luaO_pushvfstring(L, fmt, argp);
476 va_end(argp);
477 lua_unlock(L);
478 return ret;
479}
480
481
482LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
483 Closure *cl;
484 lua_lock(L);
485 luaC_checkGC(L);
486 api_checknelems(L, n);
487 cl = luaF_newCclosure(L, n, getcurrenv(L));
488 cl->c.f = fn;
489 L->top -= n;
490 while (n--)
491 setobj2n(L, &cl->c.upvalue[n], L->top+n);
492 setclvalue(L, L->top, cl);
493 lua_assert(iswhite(obj2gco(cl)));
494 api_incr_top(L);
495 lua_unlock(L);
496}
497
498
499LUA_API void lua_pushboolean (lua_State *L, int b) {
500 lua_lock(L);
501 setbvalue(L->top, (b != 0)); /* ensure that true is 1 */
502 api_incr_top(L);
503 lua_unlock(L);
504}
505
506
507LUA_API void lua_pushlightuserdata (lua_State *L, void *p) {
508 lua_lock(L);
509 setpvalue(L->top, p);
510 api_incr_top(L);
511 lua_unlock(L);
512}
513
514
515LUA_API int lua_pushthread (lua_State *L) {
516 lua_lock(L);
517 setthvalue(L, L->top, L);
518 api_incr_top(L);
519 lua_unlock(L);
520 return (G(L)->mainthread == L);
521}
522
523
524
525/*
526** get functions (Lua -> stack)
527*/
528
529
530LUA_API void lua_gettable (lua_State *L, int idx) {
531 StkId t;
532 lua_lock(L);
533 t = index2adr(L, idx);
534 api_checkvalidindex(L, t);
535 luaV_gettable(L, t, L->top - 1, L->top - 1);
536 lua_unlock(L);
537}
538
539
540LUA_API void lua_getfield (lua_State *L, int idx, const char *k) {
541 StkId t;
542 TValue key;
543 lua_lock(L);
544 t = index2adr(L, idx);
545 api_checkvalidindex(L, t);
546 setsvalue(L, &key, luaS_new(L, k));
547 luaV_gettable(L, t, &key, L->top);
548 api_incr_top(L);
549 lua_unlock(L);
550}
551
552
553LUA_API void lua_rawget (lua_State *L, int idx) {
554 StkId t;
555 lua_lock(L);
556 t = index2adr(L, idx);
557 api_check(L, ttistable(t));
558 setobj2s(L, L->top - 1, luaH_get(hvalue(t), L->top - 1));
559 lua_unlock(L);
560}
561
562
563LUA_API void lua_rawgeti (lua_State *L, int idx, int n) {
564 StkId o;
565 lua_lock(L);
566 o = index2adr(L, idx);
567 api_check(L, ttistable(o));
568 setobj2s(L, L->top, luaH_getnum(hvalue(o), n));
569 api_incr_top(L);
570 lua_unlock(L);
571}
572
573
574LUA_API void lua_createtable (lua_State *L, int narray, int nrec) {
575 lua_lock(L);
576 luaC_checkGC(L);
577 sethvalue(L, L->top, luaH_new(L, narray, nrec));
578 api_incr_top(L);
579 lua_unlock(L);
580}
581
582
583LUA_API int lua_getmetatable (lua_State *L, int objindex) {
584 const TValue *obj;
585 Table *mt = NULL;
586 int res;
587 lua_lock(L);
588 obj = index2adr(L, objindex);
589 switch (ttype(obj)) {
590 case LUA_TTABLE:
591 mt = hvalue(obj)->metatable;
592 break;
593 case LUA_TUSERDATA:
594 mt = uvalue(obj)->metatable;
595 break;
596 default:
597 mt = G(L)->mt[ttype(obj)];
598 break;
599 }
600 if (mt == NULL)
601 res = 0;
602 else {
603 sethvalue(L, L->top, mt);
604 api_incr_top(L);
605 res = 1;
606 }
607 lua_unlock(L);
608 return res;
609}
610
611
612LUA_API void lua_getfenv (lua_State *L, int idx) {
613 StkId o;
614 lua_lock(L);
615 o = index2adr(L, idx);
616 api_checkvalidindex(L, o);
617 switch (ttype(o)) {
618 case LUA_TFUNCTION:
619 sethvalue(L, L->top, clvalue(o)->c.env);
620 break;
621 case LUA_TUSERDATA:
622 sethvalue(L, L->top, uvalue(o)->env);
623 break;
624 case LUA_TTHREAD:
625 setobj2s(L, L->top, gt(thvalue(o)));
626 break;
627 default:
628 setnilvalue(L->top);
629 break;
630 }
631 api_incr_top(L);
632 lua_unlock(L);
633}
634
635
636/*
637** set functions (stack -> Lua)
638*/
639
640
641LUA_API void lua_settable (lua_State *L, int idx) {
642 StkId t;
643 lua_lock(L);
644 api_checknelems(L, 2);
645 t = index2adr(L, idx);
646 api_checkvalidindex(L, t);
647 luaV_settable(L, t, L->top - 2, L->top - 1);
648 L->top -= 2; /* pop index and value */
649 lua_unlock(L);
650}
651
652
653LUA_API void lua_setfield (lua_State *L, int idx, const char *k) {
654 StkId t;
655 TValue key;
656 lua_lock(L);
657 api_checknelems(L, 1);
658 t = index2adr(L, idx);
659 api_checkvalidindex(L, t);
660 setsvalue(L, &key, luaS_new(L, k));
661 luaV_settable(L, t, &key, L->top - 1);
662 L->top--; /* pop value */
663 lua_unlock(L);
664}
665
666
667LUA_API void lua_rawset (lua_State *L, int idx) {
668 StkId t;
669 lua_lock(L);
670 api_checknelems(L, 2);
671 t = index2adr(L, idx);
672 api_check(L, ttistable(t));
673 setobj2t(L, luaH_set(L, hvalue(t), L->top-2), L->top-1);
674 luaC_barriert(L, hvalue(t), L->top-1);
675 L->top -= 2;
676 lua_unlock(L);
677}
678
679
680LUA_API void lua_rawseti (lua_State *L, int idx, int n) {
681 StkId o;
682 lua_lock(L);
683 api_checknelems(L, 1);
684 o = index2adr(L, idx);
685 api_check(L, ttistable(o));
686 setobj2t(L, luaH_setnum(L, hvalue(o), n), L->top-1);
687 luaC_barriert(L, hvalue(o), L->top-1);
688 L->top--;
689 lua_unlock(L);
690}
691
692
693LUA_API int lua_setmetatable (lua_State *L, int objindex) {
694 TValue *obj;
695 Table *mt;
696 lua_lock(L);
697 api_checknelems(L, 1);
698 obj = index2adr(L, objindex);
699 api_checkvalidindex(L, obj);
700 if (ttisnil(L->top - 1))
701 mt = NULL;
702 else {
703 api_check(L, ttistable(L->top - 1));
704 mt = hvalue(L->top - 1);
705 }
706 switch (ttype(obj)) {
707 case LUA_TTABLE: {
708 hvalue(obj)->metatable = mt;
709 if (mt)
710 luaC_objbarriert(L, hvalue(obj), mt);
711 break;
712 }
713 case LUA_TUSERDATA: {
714 uvalue(obj)->metatable = mt;
715 if (mt)
716 luaC_objbarrier(L, rawuvalue(obj), mt);
717 break;
718 }
719 default: {
720 G(L)->mt[ttype(obj)] = mt;
721 break;
722 }
723 }
724 L->top--;
725 lua_unlock(L);
726 return 1;
727}
728
729
730LUA_API int lua_setfenv (lua_State *L, int idx) {
731 StkId o;
732 int res = 1;
733 lua_lock(L);
734 api_checknelems(L, 1);
735 o = index2adr(L, idx);
736 api_checkvalidindex(L, o);
737 api_check(L, ttistable(L->top - 1));
738 switch (ttype(o)) {
739 case LUA_TFUNCTION:
740 clvalue(o)->c.env = hvalue(L->top - 1);
741 break;
742 case LUA_TUSERDATA:
743 uvalue(o)->env = hvalue(L->top - 1);
744 break;
745 case LUA_TTHREAD:
746 sethvalue(L, gt(thvalue(o)), hvalue(L->top - 1));
747 break;
748 default:
749 res = 0;
750 break;
751 }
752 luaC_objbarrier(L, gcvalue(o), hvalue(L->top - 1));
753 L->top--;
754 lua_unlock(L);
755 return res;
756}
757
758
759/*
760** `load' and `call' functions (run Lua code)
761*/
762
763
764#define adjustresults(L,nres) \
765 { if (nres == LUA_MULTRET && L->top >= L->ci->top) L->ci->top = L->top; }
766
767
768#define checkresults(L,na,nr) \
769 api_check(L, (nr) == LUA_MULTRET || (L->ci->top - L->top >= (nr) - (na)))
770
771
772LUA_API void lua_call (lua_State *L, int nargs, int nresults) {
773 StkId func;
774 lua_lock(L);
775 api_checknelems(L, nargs+1);
776 checkresults(L, nargs, nresults);
777 func = L->top - (nargs+1);
778 luaD_call(L, func, nresults);
779 adjustresults(L, nresults);
780 lua_unlock(L);
781}
782
783
784
785/*
786** Execute a protected call.
787*/
788struct CallS { /* data to `f_call' */
789 StkId func;
790 int nresults;
791};
792
793
794static void f_call (lua_State *L, void *ud) {
795 struct CallS *c = cast(struct CallS *, ud);
796 luaD_call(L, c->func, c->nresults);
797}
798
799
800
801LUA_API int lua_pcall (lua_State *L, int nargs, int nresults, int errfunc) {
802 struct CallS c;
803 int status;
804 ptrdiff_t func;
805 lua_lock(L);
806 api_checknelems(L, nargs+1);
807 checkresults(L, nargs, nresults);
808 if (errfunc == 0)
809 func = 0;
810 else {
811 StkId o = index2adr(L, errfunc);
812 api_checkvalidindex(L, o);
813 func = savestack(L, o);
814 }
815 c.func = L->top - (nargs+1); /* function to be called */
816 c.nresults = nresults;
817 status = luaD_pcall(L, f_call, &c, savestack(L, c.func), func);
818 adjustresults(L, nresults);
819 lua_unlock(L);
820 return status;
821}
822
823
824/*
825** Execute a protected C call.
826*/
827struct CCallS { /* data to `f_Ccall' */
828 lua_CFunction func;
829 void *ud;
830};
831
832
833static void f_Ccall (lua_State *L, void *ud) {
834 struct CCallS *c = cast(struct CCallS *, ud);
835 Closure *cl;
836 cl = luaF_newCclosure(L, 0, getcurrenv(L));
837 cl->c.f = c->func;
838 setclvalue(L, L->top, cl); /* push function */
839 api_incr_top(L);
840 setpvalue(L->top, c->ud); /* push only argument */
841 api_incr_top(L);
842 luaD_call(L, L->top - 2, 0);
843}
844
845
846LUA_API int lua_cpcall (lua_State *L, lua_CFunction func, void *ud) {
847 struct CCallS c;
848 int status;
849 lua_lock(L);
850 c.func = func;
851 c.ud = ud;
852 status = luaD_pcall(L, f_Ccall, &c, savestack(L, L->top), 0);
853 lua_unlock(L);
854 return status;
855}
856
857
858LUA_API int lua_load (lua_State *L, lua_Reader reader, void *data,
859 const char *chunkname) {
860 ZIO z;
861 int status;
862 lua_lock(L);
863 if (!chunkname) chunkname = "?";
864 luaZ_init(L, &z, reader, data);
865 status = luaD_protectedparser(L, &z, chunkname);
866 lua_unlock(L);
867 return status;
868}
869
870
871LUA_API int lua_dump (lua_State *L, lua_Writer writer, void *data) {
872 int status;
873 TValue *o;
874 lua_lock(L);
875 api_checknelems(L, 1);
876 o = L->top - 1;
877 if (isLfunction(o))
878 status = luaU_dump(L, clvalue(o)->l.p, writer, data, 0);
879 else
880 status = 1;
881 lua_unlock(L);
882 return status;
883}
884
885
886LUA_API int lua_status (lua_State *L) {
887 return L->status;
888}
889
890
891/*
892** Garbage-collection function
893*/
894
895LUA_API int lua_gc (lua_State *L, int what, int data) {
896 int res = 0;
897 global_State *g;
898 lua_lock(L);
899 g = G(L);
900 switch (what) {
901 case LUA_GCSTOP: {
902 g->GCthreshold = MAX_LUMEM;
903 break;
904 }
905 case LUA_GCRESTART: {
906 g->GCthreshold = g->totalbytes;
907 break;
908 }
909 case LUA_GCCOLLECT: {
910 luaC_fullgc(L);
911 break;
912 }
913 case LUA_GCCOUNT: {
914 /* GC values are expressed in Kbytes: #bytes/2^10 */
915 res = cast_int(g->totalbytes >> 10);
916 break;
917 }
918 case LUA_GCCOUNTB: {
919 res = cast_int(g->totalbytes & 0x3ff);
920 break;
921 }
922 case LUA_GCSTEP: {
923 lu_mem a = (cast(lu_mem, data) << 10);
924 if (a <= g->totalbytes)
925 g->GCthreshold = g->totalbytes - a;
926 else
927 g->GCthreshold = 0;
928 while (g->GCthreshold <= g->totalbytes)
929 luaC_step(L);
930 if (g->gcstate == GCSpause) /* end of cycle? */
931 res = 1; /* signal it */
932 break;
933 }
934 case LUA_GCSETPAUSE: {
935 res = g->gcpause;
936 g->gcpause = data;
937 break;
938 }
939 case LUA_GCSETSTEPMUL: {
940 res = g->gcstepmul;
941 g->gcstepmul = data;
942 break;
943 }
944 default: res = -1; /* invalid option */
945 }
946 lua_unlock(L);
947 return res;
948}
949
950
951
952/*
953** miscellaneous functions
954*/
955
956
957LUA_API int lua_error (lua_State *L) {
958 lua_lock(L);
959 api_checknelems(L, 1);
960 luaG_errormsg(L);
961 lua_unlock(L);
962 return 0; /* to avoid warnings */
963}
964
965
966LUA_API int lua_next (lua_State *L, int idx) {
967 StkId t;
968 int more;
969 lua_lock(L);
970 t = index2adr(L, idx);
971 api_check(L, ttistable(t));
972 more = luaH_next(L, hvalue(t), L->top - 1);
973 if (more) {
974 api_incr_top(L);
975 }
976 else /* no more elements */
977 L->top -= 1; /* remove key */
978 lua_unlock(L);
979 return more;
980}
981
982
983LUA_API void lua_concat (lua_State *L, int n) {
984 lua_lock(L);
985 api_checknelems(L, n);
986 if (n >= 2) {
987 luaC_checkGC(L);
988 luaV_concat(L, n, cast_int(L->top - L->base) - 1);
989 L->top -= (n-1);
990 }
991 else if (n == 0) { /* push empty string */
992 setsvalue2s(L, L->top, luaS_newlstr(L, "", 0));
993 api_incr_top(L);
994 }
995 /* else n == 1; nothing to do */
996 lua_unlock(L);
997}
998
999
1000LUA_API lua_Alloc lua_getallocf (lua_State *L, void **ud) {
1001 lua_Alloc f;
1002 lua_lock(L);
1003 if (ud) *ud = G(L)->ud;
1004 f = G(L)->frealloc;
1005 lua_unlock(L);
1006 return f;
1007}
1008
1009
1010LUA_API void lua_setallocf (lua_State *L, lua_Alloc f, void *ud) {
1011 lua_lock(L);
1012 G(L)->ud = ud;
1013 G(L)->frealloc = f;
1014 lua_unlock(L);
1015}
1016
1017
1018LUA_API void *lua_newuserdata (lua_State *L, size_t size) {
1019 Udata *u;
1020 lua_lock(L);
1021 luaC_checkGC(L);
1022 u = luaS_newudata(L, size, getcurrenv(L));
1023 setuvalue(L, L->top, u);
1024 api_incr_top(L);
1025 lua_unlock(L);
1026 return u + 1;
1027}
1028
1029
1030
1031
1032static const char *aux_upvalue (StkId fi, int n, TValue **val) {
1033 Closure *f;
1034 if (!ttisfunction(fi)) return NULL;
1035 f = clvalue(fi);
1036 if (f->c.isC) {
1037 if (!(1 <= n && n <= f->c.nupvalues)) return NULL;
1038 *val = &f->c.upvalue[n-1];
1039 return "";
1040 }
1041 else {
1042 Proto *p = f->l.p;
1043 if (!(1 <= n && n <= p->sizeupvalues)) return NULL;
1044 *val = f->l.upvals[n-1]->v;
1045 return getstr(p->upvalues[n-1]);
1046 }
1047}
1048
1049
1050LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) {
1051 const char *name;
1052 TValue *val;
1053 lua_lock(L);
1054 name = aux_upvalue(index2adr(L, funcindex), n, &val);
1055 if (name) {
1056 setobj2s(L, L->top, val);
1057 api_incr_top(L);
1058 }
1059 lua_unlock(L);
1060 return name;
1061}
1062
1063
1064LUA_API const char *lua_setupvalue (lua_State *L, int funcindex, int n) {
1065 const char *name;
1066 TValue *val;
1067 StkId fi;
1068 lua_lock(L);
1069 fi = index2adr(L, funcindex);
1070 api_checknelems(L, 1);
1071 name = aux_upvalue(fi, n, &val);
1072 if (name) {
1073 L->top--;
1074 setobj(L, val, L->top);
1075 luaC_barrier(L, clvalue(fi), L->top);
1076 }
1077 lua_unlock(L);
1078 return name;
1079}
1080
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