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comparison lib/lua/lua-5.2.2/lapi.c @ 1866:41cc4dd3c122

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Lua 5.2.2 added.
author Nomad
date Wed, 16 Oct 2013 13:34:26 +0200
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1848:3b39b70e8e93 1866:41cc4dd3c122
1 /*
2 ** $Id: 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