aboutsummaryrefslogtreecommitdiffstatshomepage
path: root/libraries/LuaJIT-1.1.7/src/lvm.c
diff options
context:
space:
mode:
Diffstat (limited to 'libraries/LuaJIT-1.1.7/src/lvm.c')
-rw-r--r--libraries/LuaJIT-1.1.7/src/lvm.c766
1 files changed, 0 insertions, 766 deletions
diff --git a/libraries/LuaJIT-1.1.7/src/lvm.c b/libraries/LuaJIT-1.1.7/src/lvm.c
deleted file mode 100644
index d24f43c..0000000
--- a/libraries/LuaJIT-1.1.7/src/lvm.c
+++ /dev/null
@@ -1,766 +0,0 @@
1/*
2** $Id: lvm.c,v 2.63.1.3 2007/12/28 15:32:23 roberto Exp $
3** Lua virtual machine
4** See Copyright Notice in lua.h
5*/
6
7
8#include <stdio.h>
9#include <stdlib.h>
10#include <string.h>
11
12#define lvm_c
13#define LUA_CORE
14
15#include "lua.h"
16
17#include "ldebug.h"
18#include "ldo.h"
19#include "lfunc.h"
20#include "lgc.h"
21#include "lobject.h"
22#include "lopcodes.h"
23#include "lstate.h"
24#include "lstring.h"
25#include "ltable.h"
26#include "ltm.h"
27#include "lvm.h"
28
29
30
31/* limit for table tag-method chains (to avoid loops) */
32#define MAXTAGLOOP 100
33
34
35const TValue *luaV_tonumber (const TValue *obj, TValue *n) {
36 lua_Number num;
37 if (ttisnumber(obj)) return obj;
38 if (ttisstring(obj) && luaO_str2d(svalue(obj), &num)) {
39 setnvalue(n, num);
40 return n;
41 }
42 else
43 return NULL;
44}
45
46
47int luaV_tostring (lua_State *L, StkId obj) {
48 if (!ttisnumber(obj))
49 return 0;
50 else {
51 char s[LUAI_MAXNUMBER2STR];
52 lua_Number n = nvalue(obj);
53 lua_number2str(s, n);
54 setsvalue2s(L, obj, luaS_new(L, s));
55 return 1;
56 }
57}
58
59
60static void traceexec (lua_State *L, const Instruction *pc) {
61 lu_byte mask = L->hookmask;
62 const Instruction *oldpc = L->savedpc;
63 L->savedpc = pc;
64 if ((mask & LUA_MASKCOUNT) && L->hookcount == 0) {
65 resethookcount(L);
66 luaD_callhook(L, LUA_HOOKCOUNT, -1);
67 }
68 if (mask & LUA_MASKLINE) {
69 Proto *p = ci_func(L->ci)->l.p;
70 int npc = pcRel(pc, p);
71 int newline = getline(p, npc);
72 /* call linehook when enter a new function, when jump back (loop),
73 or when enter a new line */
74 if (npc == 0 || pc <= oldpc || newline != getline(p, pcRel(oldpc, p)))
75 luaD_callhook(L, LUA_HOOKLINE, newline);
76 }
77}
78
79
80static void callTMres (lua_State *L, StkId res, const TValue *f,
81 const TValue *p1, const TValue *p2) {
82 ptrdiff_t result = savestack(L, res);
83 setobj2s(L, L->top, f); /* push function */
84 setobj2s(L, L->top+1, p1); /* 1st argument */
85 setobj2s(L, L->top+2, p2); /* 2nd argument */
86 luaD_checkstack(L, 3);
87 L->top += 3;
88 luaD_call(L, L->top - 3, 1);
89 res = restorestack(L, result);
90 L->top--;
91 setobjs2s(L, res, L->top);
92}
93
94
95
96static void callTM (lua_State *L, const TValue *f, const TValue *p1,
97 const TValue *p2, const TValue *p3) {
98 setobj2s(L, L->top, f); /* push function */
99 setobj2s(L, L->top+1, p1); /* 1st argument */
100 setobj2s(L, L->top+2, p2); /* 2nd argument */
101 setobj2s(L, L->top+3, p3); /* 3th argument */
102 luaD_checkstack(L, 4);
103 L->top += 4;
104 luaD_call(L, L->top - 4, 0);
105}
106
107
108void luaV_gettable (lua_State *L, const TValue *t, TValue *key, StkId val) {
109 int loop;
110 for (loop = 0; loop < MAXTAGLOOP; loop++) {
111 const TValue *tm;
112 if (ttistable(t)) { /* `t' is a table? */
113 Table *h = hvalue(t);
114 const TValue *res = luaH_get(h, key); /* do a primitive get */
115 if (!ttisnil(res) || /* result is no nil? */
116 (tm = fasttm(L, h->metatable, TM_INDEX)) == NULL) { /* or no TM? */
117 setobj2s(L, val, res);
118 return;
119 }
120 /* else will try the tag method */
121 }
122 else if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_INDEX)))
123 luaG_typeerror(L, t, "index");
124 if (ttisfunction(tm)) {
125 callTMres(L, val, tm, t, key);
126 return;
127 }
128 t = tm; /* else repeat with `tm' */
129 }
130 luaG_runerror(L, "loop in gettable");
131}
132
133
134void luaV_settable (lua_State *L, const TValue *t, TValue *key, StkId val) {
135 int loop;
136 TValue temp;
137 for (loop = 0; loop < MAXTAGLOOP; loop++) {
138 const TValue *tm;
139 if (ttistable(t)) { /* `t' is a table? */
140 Table *h = hvalue(t);
141 TValue *oldval = luaH_set(L, h, key); /* do a primitive set */
142 if (!ttisnil(oldval) || /* result is no nil? */
143 (tm = fasttm(L, h->metatable, TM_NEWINDEX)) == NULL) { /* or no TM? */
144 setobj2t(L, oldval, val);
145 luaC_barriert(L, h, val);
146 return;
147 }
148 /* else will try the tag method */
149 }
150 else if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_NEWINDEX)))
151 luaG_typeerror(L, t, "index");
152 if (ttisfunction(tm)) {
153 callTM(L, tm, t, key, val);
154 return;
155 }
156 /* else repeat with `tm' */
157 setobj(L, &temp, tm); /* avoid pointing inside table (may rehash) */
158 t = &temp;
159 }
160 luaG_runerror(L, "loop in settable");
161}
162
163
164static int call_binTM (lua_State *L, const TValue *p1, const TValue *p2,
165 StkId res, TMS event) {
166 const TValue *tm = luaT_gettmbyobj(L, p1, event); /* try first operand */
167 if (ttisnil(tm))
168 tm = luaT_gettmbyobj(L, p2, event); /* try second operand */
169 if (ttisnil(tm)) return 0;
170 callTMres(L, res, tm, p1, p2);
171 return 1;
172}
173
174
175static const TValue *get_compTM (lua_State *L, Table *mt1, Table *mt2,
176 TMS event) {
177 const TValue *tm1 = fasttm(L, mt1, event);
178 const TValue *tm2;
179 if (tm1 == NULL) return NULL; /* no metamethod */
180 if (mt1 == mt2) return tm1; /* same metatables => same metamethods */
181 tm2 = fasttm(L, mt2, event);
182 if (tm2 == NULL) return NULL; /* no metamethod */
183 if (luaO_rawequalObj(tm1, tm2)) /* same metamethods? */
184 return tm1;
185 return NULL;
186}
187
188
189static int call_orderTM (lua_State *L, const TValue *p1, const TValue *p2,
190 TMS event) {
191 const TValue *tm1 = luaT_gettmbyobj(L, p1, event);
192 const TValue *tm2;
193 if (ttisnil(tm1)) return -1; /* no metamethod? */
194 tm2 = luaT_gettmbyobj(L, p2, event);
195 if (!luaO_rawequalObj(tm1, tm2)) /* different metamethods? */
196 return -1;
197 callTMres(L, L->top, tm1, p1, p2);
198 return !l_isfalse(L->top);
199}
200
201
202static int l_strcmp (const TString *ls, const TString *rs) {
203 const char *l = getstr(ls);
204 size_t ll = ls->tsv.len;
205 const char *r = getstr(rs);
206 size_t lr = rs->tsv.len;
207 for (;;) {
208 int temp = strcoll(l, r);
209 if (temp != 0) return temp;
210 else { /* strings are equal up to a `\0' */
211 size_t len = strlen(l); /* index of first `\0' in both strings */
212 if (len == lr) /* r is finished? */
213 return (len == ll) ? 0 : 1;
214 else if (len == ll) /* l is finished? */
215 return -1; /* l is smaller than r (because r is not finished) */
216 /* both strings longer than `len'; go on comparing (after the `\0') */
217 len++;
218 l += len; ll -= len; r += len; lr -= len;
219 }
220 }
221}
222
223
224int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r) {
225 int res;
226 if (ttype(l) != ttype(r))
227 return luaG_ordererror(L, l, r);
228 else if (ttisnumber(l))
229 return luai_numlt(nvalue(l), nvalue(r));
230 else if (ttisstring(l))
231 return l_strcmp(rawtsvalue(l), rawtsvalue(r)) < 0;
232 else if ((res = call_orderTM(L, l, r, TM_LT)) != -1)
233 return res;
234 return luaG_ordererror(L, l, r);
235}
236
237
238int luaV_lessequal (lua_State *L, const TValue *l, const TValue *r) {
239 int res;
240 if (ttype(l) != ttype(r))
241 return luaG_ordererror(L, l, r);
242 else if (ttisnumber(l))
243 return luai_numle(nvalue(l), nvalue(r));
244 else if (ttisstring(l))
245 return l_strcmp(rawtsvalue(l), rawtsvalue(r)) <= 0;
246 else if ((res = call_orderTM(L, l, r, TM_LE)) != -1) /* first try `le' */
247 return res;
248 else if ((res = call_orderTM(L, r, l, TM_LT)) != -1) /* else try `lt' */
249 return !res;
250 return luaG_ordererror(L, l, r);
251}
252
253
254int luaV_equalval (lua_State *L, const TValue *t1, const TValue *t2) {
255 const TValue *tm;
256 lua_assert(ttype(t1) == ttype(t2));
257 switch (ttype(t1)) {
258 case LUA_TNIL: return 1;
259 case LUA_TNUMBER: return luai_numeq(nvalue(t1), nvalue(t2));
260 case LUA_TBOOLEAN: return bvalue(t1) == bvalue(t2); /* true must be 1 !! */
261 case LUA_TLIGHTUSERDATA: return pvalue(t1) == pvalue(t2);
262 case LUA_TUSERDATA: {
263 if (uvalue(t1) == uvalue(t2)) return 1;
264 tm = get_compTM(L, uvalue(t1)->metatable, uvalue(t2)->metatable,
265 TM_EQ);
266 break; /* will try TM */
267 }
268 case LUA_TTABLE: {
269 if (hvalue(t1) == hvalue(t2)) return 1;
270 tm = get_compTM(L, hvalue(t1)->metatable, hvalue(t2)->metatable, TM_EQ);
271 break; /* will try TM */
272 }
273 default: return gcvalue(t1) == gcvalue(t2);
274 }
275 if (tm == NULL) return 0; /* no TM? */
276 callTMres(L, L->top, tm, t1, t2); /* call TM */
277 return !l_isfalse(L->top);
278}
279
280
281void luaV_concat (lua_State *L, int total, int last) {
282 do {
283 StkId top = L->base + last + 1;
284 int n = 2; /* number of elements handled in this pass (at least 2) */
285 if (!(ttisstring(top-2) || ttisnumber(top-2)) || !tostring(L, top-1)) {
286 if (!call_binTM(L, top-2, top-1, top-2, TM_CONCAT))
287 luaG_concaterror(L, top-2, top-1);
288 } else if (tsvalue(top-1)->len == 0) /* second op is empty? */
289 (void)tostring(L, top - 2); /* result is first op (as string) */
290 else {
291 /* at least two string values; get as many as possible */
292 size_t tl = tsvalue(top-1)->len;
293 char *buffer;
294 int i;
295 /* collect total length */
296 for (n = 1; n < total && tostring(L, top-n-1); n++) {
297 size_t l = tsvalue(top-n-1)->len;
298 if (l >= MAX_SIZET - tl) luaG_runerror(L, "string length overflow");
299 tl += l;
300 }
301 buffer = luaZ_openspace(L, &G(L)->buff, tl);
302 tl = 0;
303 for (i=n; i>0; i--) { /* concat all strings */
304 size_t l = tsvalue(top-i)->len;
305 memcpy(buffer+tl, svalue(top-i), l);
306 tl += l;
307 }
308 setsvalue2s(L, top-n, luaS_newlstr(L, buffer, tl));
309 }
310 total -= n-1; /* got `n' strings to create 1 new */
311 last -= n-1;
312 } while (total > 1); /* repeat until only 1 result left */
313}
314
315
316void luaV_arith (lua_State *L, StkId ra, const TValue *rb,
317 const TValue *rc, TMS op) {
318 TValue tempb, tempc;
319 const TValue *b, *c;
320 if ((b = luaV_tonumber(rb, &tempb)) != NULL &&
321 (c = luaV_tonumber(rc, &tempc)) != NULL) {
322 lua_Number nb = nvalue(b), nc = nvalue(c);
323 switch (op) {
324 case TM_ADD: setnvalue(ra, luai_numadd(nb, nc)); break;
325 case TM_SUB: setnvalue(ra, luai_numsub(nb, nc)); break;
326 case TM_MUL: setnvalue(ra, luai_nummul(nb, nc)); break;
327 case TM_DIV: setnvalue(ra, luai_numdiv(nb, nc)); break;
328 case TM_MOD: setnvalue(ra, luai_nummod(nb, nc)); break;
329 case TM_POW: setnvalue(ra, luai_numpow(nb, nc)); break;
330 case TM_UNM: setnvalue(ra, luai_numunm(nb)); break;
331 default: lua_assert(0); break;
332 }
333 }
334 else if (!call_binTM(L, rb, rc, ra, op))
335 luaG_aritherror(L, rb, rc);
336}
337
338
339
340/*
341** some macros for common tasks in `luaV_execute'
342*/
343
344#define runtime_check(L, c) { if (!(c)) break; }
345
346#define RA(i) (base+GETARG_A(i))
347/* to be used after possible stack reallocation */
348#define RB(i) check_exp(getBMode(GET_OPCODE(i)) == OpArgR, base+GETARG_B(i))
349#define RC(i) check_exp(getCMode(GET_OPCODE(i)) == OpArgR, base+GETARG_C(i))
350#define RKB(i) check_exp(getBMode(GET_OPCODE(i)) == OpArgK, \
351 ISK(GETARG_B(i)) ? k+INDEXK(GETARG_B(i)) : base+GETARG_B(i))
352#define RKC(i) check_exp(getCMode(GET_OPCODE(i)) == OpArgK, \
353 ISK(GETARG_C(i)) ? k+INDEXK(GETARG_C(i)) : base+GETARG_C(i))
354#define KBx(i) check_exp(getBMode(GET_OPCODE(i)) == OpArgK, k+GETARG_Bx(i))
355
356
357#define dojump(L,pc,i) {(pc) += (i); luai_threadyield(L);}
358
359
360#define Protect(x) { L->savedpc = pc; {x;}; base = L->base; }
361
362
363#define arith_op(op,tm) { \
364 TValue *rb = RKB(i); \
365 TValue *rc = RKC(i); \
366 if (ttisnumber(rb) && ttisnumber(rc)) { \
367 lua_Number nb = nvalue(rb), nc = nvalue(rc); \
368 setnvalue(ra, op(nb, nc)); \
369 } \
370 else \
371 Protect(luaV_arith(L, ra, rb, rc, tm)); \
372 }
373
374
375
376void luaV_execute (lua_State *L, int nexeccalls) {
377 LClosure *cl;
378 StkId base;
379 TValue *k;
380 const Instruction *pc;
381 reentry: /* entry point */
382 lua_assert(isLua(L->ci));
383 pc = L->savedpc;
384 cl = &clvalue(L->ci->func)->l;
385 base = L->base;
386 k = cl->p->k;
387 /* main loop of interpreter */
388 for (;;) {
389 const Instruction i = *pc++;
390 StkId ra;
391 if ((L->hookmask & (LUA_MASKLINE | LUA_MASKCOUNT)) &&
392 (--L->hookcount == 0 || L->hookmask & LUA_MASKLINE)) {
393 traceexec(L, pc);
394 if (L->status == LUA_YIELD) { /* did hook yield? */
395 L->savedpc = pc - 1;
396 return;
397 }
398 base = L->base;
399 }
400 /* warning!! several calls may realloc the stack and invalidate `ra' */
401 ra = RA(i);
402 lua_assert(base == L->base && L->base == L->ci->base);
403 lua_assert(base <= L->top && L->top <= L->stack + L->stacksize);
404 lua_assert(L->top == L->ci->top || luaG_checkopenop(i));
405 switch (GET_OPCODE(i)) {
406 case OP_MOVE: {
407 setobjs2s(L, ra, RB(i));
408 continue;
409 }
410 case OP_LOADK: {
411 setobj2s(L, ra, KBx(i));
412 continue;
413 }
414 case OP_LOADBOOL: {
415 setbvalue(ra, GETARG_B(i));
416 if (GETARG_C(i)) pc++; /* skip next instruction (if C) */
417 continue;
418 }
419 case OP_LOADNIL: {
420 TValue *rb = RB(i);
421 do {
422 setnilvalue(rb--);
423 } while (rb >= ra);
424 continue;
425 }
426 case OP_GETUPVAL: {
427 int b = GETARG_B(i);
428 setobj2s(L, ra, cl->upvals[b]->v);
429 continue;
430 }
431 case OP_GETGLOBAL: {
432 TValue g;
433 TValue *rb = KBx(i);
434 sethvalue(L, &g, cl->env);
435 lua_assert(ttisstring(rb));
436 Protect(luaV_gettable(L, &g, rb, ra));
437 continue;
438 }
439 case OP_GETTABLE: {
440 Protect(luaV_gettable(L, RB(i), RKC(i), ra));
441 continue;
442 }
443 case OP_SETGLOBAL: {
444 TValue g;
445 sethvalue(L, &g, cl->env);
446 lua_assert(ttisstring(KBx(i)));
447 Protect(luaV_settable(L, &g, KBx(i), ra));
448 continue;
449 }
450 case OP_SETUPVAL: {
451 UpVal *uv = cl->upvals[GETARG_B(i)];
452 setobj(L, uv->v, ra);
453 luaC_barrier(L, uv, ra);
454 continue;
455 }
456 case OP_SETTABLE: {
457 Protect(luaV_settable(L, ra, RKB(i), RKC(i)));
458 continue;
459 }
460 case OP_NEWTABLE: {
461 int b = GETARG_B(i);
462 int c = GETARG_C(i);
463 sethvalue(L, ra, luaH_new(L, luaO_fb2int(b), luaO_fb2int(c)));
464 Protect(luaC_checkGC(L));
465 continue;
466 }
467 case OP_SELF: {
468 StkId rb = RB(i);
469 setobjs2s(L, ra+1, rb);
470 Protect(luaV_gettable(L, rb, RKC(i), ra));
471 continue;
472 }
473 case OP_ADD: {
474 arith_op(luai_numadd, TM_ADD);
475 continue;
476 }
477 case OP_SUB: {
478 arith_op(luai_numsub, TM_SUB);
479 continue;
480 }
481 case OP_MUL: {
482 arith_op(luai_nummul, TM_MUL);
483 continue;
484 }
485 case OP_DIV: {
486 arith_op(luai_numdiv, TM_DIV);
487 continue;
488 }
489 case OP_MOD: {
490 arith_op(luai_nummod, TM_MOD);
491 continue;
492 }
493 case OP_POW: {
494 arith_op(luai_numpow, TM_POW);
495 continue;
496 }
497 case OP_UNM: {
498 TValue *rb = RB(i);
499 if (ttisnumber(rb)) {
500 lua_Number nb = nvalue(rb);
501 setnvalue(ra, luai_numunm(nb));
502 }
503 else {
504 Protect(luaV_arith(L, ra, rb, rb, TM_UNM));
505 }
506 continue;
507 }
508 case OP_NOT: {
509 int res = l_isfalse(RB(i)); /* next assignment may change this value */
510 setbvalue(ra, res);
511 continue;
512 }
513 case OP_LEN: {
514 const TValue *rb = RB(i);
515 switch (ttype(rb)) {
516 case LUA_TTABLE: {
517 setnvalue(ra, cast_num(luaH_getn(hvalue(rb))));
518 break;
519 }
520 case LUA_TSTRING: {
521 setnvalue(ra, cast_num(tsvalue(rb)->len));
522 break;
523 }
524 default: { /* try metamethod */
525 Protect(
526 if (!call_binTM(L, rb, luaO_nilobject, ra, TM_LEN))
527 luaG_typeerror(L, rb, "get length of");
528 )
529 }
530 }
531 continue;
532 }
533 case OP_CONCAT: {
534 int b = GETARG_B(i);
535 int c = GETARG_C(i);
536 Protect(luaV_concat(L, c-b+1, c); luaC_checkGC(L));
537 setobjs2s(L, RA(i), base+b);
538 continue;
539 }
540 case OP_JMP: {
541 dojump(L, pc, GETARG_sBx(i));
542 continue;
543 }
544 case OP_EQ: {
545 TValue *rb = RKB(i);
546 TValue *rc = RKC(i);
547 Protect(
548 if (equalobj(L, rb, rc) == GETARG_A(i))
549 dojump(L, pc, GETARG_sBx(*pc));
550 )
551 pc++;
552 continue;
553 }
554 case OP_LT: {
555 Protect(
556 if (luaV_lessthan(L, RKB(i), RKC(i)) == GETARG_A(i))
557 dojump(L, pc, GETARG_sBx(*pc));
558 )
559 pc++;
560 continue;
561 }
562 case OP_LE: {
563 Protect(
564 if (luaV_lessequal(L, RKB(i), RKC(i)) == GETARG_A(i))
565 dojump(L, pc, GETARG_sBx(*pc));
566 )
567 pc++;
568 continue;
569 }
570 case OP_TEST: {
571 if (l_isfalse(ra) != GETARG_C(i))
572 dojump(L, pc, GETARG_sBx(*pc));
573 pc++;
574 continue;
575 }
576 case OP_TESTSET: {
577 TValue *rb = RB(i);
578 if (l_isfalse(rb) != GETARG_C(i)) {
579 setobjs2s(L, ra, rb);
580 dojump(L, pc, GETARG_sBx(*pc));
581 }
582 pc++;
583 continue;
584 }
585 case OP_CALL: {
586 int b = GETARG_B(i);
587 int nresults = GETARG_C(i) - 1;
588 if (b != 0) L->top = ra+b; /* else previous instruction set top */
589 L->savedpc = pc;
590 switch (luaD_precall(L, ra, nresults)) {
591 case PCRLUA: {
592 nexeccalls++;
593 goto reentry; /* restart luaV_execute over new Lua function */
594 }
595 case PCRC: {
596 /* it was a C function (`precall' called it); adjust results */
597 if (nresults >= 0) L->top = L->ci->top;
598 base = L->base;
599 continue;
600 }
601 default: {
602 return; /* yield */
603 }
604 }
605 }
606 case OP_TAILCALL: {
607 int b = GETARG_B(i);
608 if (b != 0) L->top = ra+b; /* else previous instruction set top */
609 L->savedpc = pc;
610 lua_assert(GETARG_C(i) - 1 == LUA_MULTRET);
611 switch (luaD_precall(L, ra, LUA_MULTRET)) {
612 case PCRLUA: {
613 /* tail call: put new frame in place of previous one */
614 CallInfo *ci = L->ci - 1; /* previous frame */
615 int aux;
616 StkId func = ci->func;
617 StkId pfunc = (ci+1)->func; /* previous function index */
618 if (L->openupval) luaF_close(L, ci->base);
619 L->base = ci->base = ci->func + ((ci+1)->base - pfunc);
620 for (aux = 0; pfunc+aux < L->top; aux++) /* move frame down */
621 setobjs2s(L, func+aux, pfunc+aux);
622 ci->top = L->top = func+aux; /* correct top */
623 lua_assert(L->top == L->base + clvalue(func)->l.p->maxstacksize);
624 ci->savedpc = L->savedpc;
625 ci->tailcalls++; /* one more call lost */
626 L->ci--; /* remove new frame */
627 goto reentry;
628 }
629 case PCRC: { /* it was a C function (`precall' called it) */
630 base = L->base;
631 continue;
632 }
633 default: {
634 return; /* yield */
635 }
636 }
637 }
638 case OP_RETURN: {
639 int b = GETARG_B(i);
640 if (b != 0) L->top = ra+b-1;
641 if (L->openupval) luaF_close(L, base);
642 L->savedpc = pc;
643 b = luaD_poscall(L, ra);
644 if (--nexeccalls == 0) /* was previous function running `here'? */
645 return; /* no: return */
646 else { /* yes: continue its execution */
647 if (b) L->top = L->ci->top;
648 lua_assert(isLua(L->ci));
649 lua_assert(GET_OPCODE(*((L->ci)->savedpc - 1)) == OP_CALL);
650 goto reentry;
651 }
652 }
653 case OP_FORLOOP: {
654 lua_Number step = nvalue(ra+2);
655 lua_Number idx = luai_numadd(nvalue(ra), step); /* increment index */
656 lua_Number limit = nvalue(ra+1);
657 if (luai_numlt(0, step) ? luai_numle(idx, limit)
658 : luai_numle(limit, idx)) {
659 dojump(L, pc, GETARG_sBx(i)); /* jump back */
660 setnvalue(ra, idx); /* update internal index... */
661 setnvalue(ra+3, idx); /* ...and external index */
662 }
663 continue;
664 }
665 case OP_FORPREP: {
666 const TValue *init = ra;
667 const TValue *plimit = ra+1;
668 const TValue *pstep = ra+2;
669 L->savedpc = pc; /* next steps may throw errors */
670 if (!tonumber(init, ra))
671 luaG_runerror(L, LUA_QL("for") " initial value must be a number");
672 else if (!tonumber(plimit, ra+1))
673 luaG_runerror(L, LUA_QL("for") " limit must be a number");
674 else if (!tonumber(pstep, ra+2))
675 luaG_runerror(L, LUA_QL("for") " step must be a number");
676 setnvalue(ra, luai_numsub(nvalue(ra), nvalue(pstep)));
677 dojump(L, pc, GETARG_sBx(i));
678 continue;
679 }
680 case OP_TFORLOOP: {
681 StkId cb = ra + 3; /* call base */
682 setobjs2s(L, cb+2, ra+2);
683 setobjs2s(L, cb+1, ra+1);
684 setobjs2s(L, cb, ra);
685 L->top = cb+3; /* func. + 2 args (state and index) */
686 Protect(luaD_call(L, cb, GETARG_C(i)));
687 L->top = L->ci->top;
688 cb = RA(i) + 3; /* previous call may change the stack */
689 if (!ttisnil(cb)) { /* continue loop? */
690 setobjs2s(L, cb-1, cb); /* save control variable */
691 dojump(L, pc, GETARG_sBx(*pc)); /* jump back */
692 }
693 pc++;
694 continue;
695 }
696 case OP_SETLIST: {
697 int n = GETARG_B(i);
698 int c = GETARG_C(i);
699 int last;
700 Table *h;
701 if (n == 0) {
702 n = cast_int(L->top - ra) - 1;
703 L->top = L->ci->top;
704 }
705 if (c == 0) c = cast_int(*pc++);
706 runtime_check(L, ttistable(ra));
707 h = hvalue(ra);
708 last = ((c-1)*LFIELDS_PER_FLUSH) + n;
709 if (last > h->sizearray) /* needs more space? */
710 luaH_resizearray(L, h, last); /* pre-alloc it at once */
711 for (; n > 0; n--) {
712 TValue *val = ra+n;
713 setobj2t(L, luaH_setnum(L, h, last--), val);
714 luaC_barriert(L, h, val);
715 }
716 continue;
717 }
718 case OP_CLOSE: {
719 luaF_close(L, ra);
720 continue;
721 }
722 case OP_CLOSURE: {
723 Proto *p;
724 Closure *ncl;
725 int nup, j;
726 p = cl->p->p[GETARG_Bx(i)];
727 nup = p->nups;
728 ncl = luaF_newLclosure(L, nup, cl->env);
729 ncl->l.p = p;
730 for (j=0; j<nup; j++, pc++) {
731 if (GET_OPCODE(*pc) == OP_GETUPVAL)
732 ncl->l.upvals[j] = cl->upvals[GETARG_B(*pc)];
733 else {
734 lua_assert(GET_OPCODE(*pc) == OP_MOVE);
735 ncl->l.upvals[j] = luaF_findupval(L, base + GETARG_B(*pc));
736 }
737 }
738 setclvalue(L, ra, ncl);
739 Protect(luaC_checkGC(L));
740 continue;
741 }
742 case OP_VARARG: {
743 int b = GETARG_B(i) - 1;
744 int j;
745 CallInfo *ci = L->ci;
746 int n = cast_int(ci->base - ci->func) - cl->p->numparams - 1;
747 if (b == LUA_MULTRET) {
748 Protect(luaD_checkstack(L, n));
749 ra = RA(i); /* previous call may change the stack */
750 b = n;
751 L->top = ra + n;
752 }
753 for (j = 0; j < b; j++) {
754 if (j < n) {
755 setobjs2s(L, ra + j, ci->base - n + j);
756 }
757 else {
758 setnilvalue(ra + j);
759 }
760 }
761 continue;
762 }
763 }
764 }
765}
766
generated by cgit v1.1 at 2024-07-01 03:58:20 +0000