1 /* scope.c
2 *
3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 * 2000, 2001, 2002, 2003, 2004, by Larry Wall and others
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
9 */
10
11 /*
12 * "For the fashion of Minas Tirith was such that it was built on seven
13 * levels..."
14 */
15
16 #include "EXTERN.h"
17 #define PERL_IN_SCOPE_C
18 #include "perl.h"
19
20 #if defined(PERL_FLEXIBLE_EXCEPTIONS)
21 void *
Perl_default_protect(pTHX_ volatile JMPENV * pcur_env,int * excpt,protect_body_t body,...)22 Perl_default_protect(pTHX_ volatile JMPENV *pcur_env, int *excpt,
23 protect_body_t body, ...)
24 {
25 void *ret;
26 va_list args;
27 va_start(args, body);
28 ret = vdefault_protect(pcur_env, excpt, body, &args);
29 va_end(args);
30 return ret;
31 }
32
33 void *
Perl_vdefault_protect(pTHX_ volatile JMPENV * pcur_env,int * excpt,protect_body_t body,va_list * args)34 Perl_vdefault_protect(pTHX_ volatile JMPENV *pcur_env, int *excpt,
35 protect_body_t body, va_list *args)
36 {
37 int ex;
38 void *ret;
39
40 JMPENV_PUSH(ex);
41 if (ex)
42 ret = NULL;
43 else
44 ret = CALL_FPTR(body)(aTHX_ *args);
45 *excpt = ex;
46 JMPENV_POP;
47 return ret;
48 }
49 #endif
50
51 SV**
Perl_stack_grow(pTHX_ SV ** sp,SV ** p,int n)52 Perl_stack_grow(pTHX_ SV **sp, SV **p, int n)
53 {
54 PL_stack_sp = sp;
55 #ifndef STRESS_REALLOC
56 av_extend(PL_curstack, (p - PL_stack_base) + (n) + 128);
57 #else
58 av_extend(PL_curstack, (p - PL_stack_base) + (n) + 1);
59 #endif
60 return PL_stack_sp;
61 }
62
63 #ifndef STRESS_REALLOC
64 #define GROW(old) ((old) * 3 / 2)
65 #else
66 #define GROW(old) ((old) + 1)
67 #endif
68
69 PERL_SI *
Perl_new_stackinfo(pTHX_ I32 stitems,I32 cxitems)70 Perl_new_stackinfo(pTHX_ I32 stitems, I32 cxitems)
71 {
72 PERL_SI *si;
73 New(56, si, 1, PERL_SI);
74 si->si_stack = newAV();
75 AvREAL_off(si->si_stack);
76 av_extend(si->si_stack, stitems > 0 ? stitems-1 : 0);
77 AvALLOC(si->si_stack)[0] = &PL_sv_undef;
78 AvFILLp(si->si_stack) = 0;
79 si->si_prev = 0;
80 si->si_next = 0;
81 si->si_cxmax = cxitems - 1;
82 si->si_cxix = -1;
83 si->si_type = PERLSI_UNDEF;
84 New(56, si->si_cxstack, cxitems, PERL_CONTEXT);
85 /* Without any kind of initialising PUSHSUBST()
86 * in pp_subst() will read uninitialised heap. */
87 Poison(si->si_cxstack, cxitems, PERL_CONTEXT);
88 return si;
89 }
90
91 I32
Perl_cxinc(pTHX)92 Perl_cxinc(pTHX)
93 {
94 IV old_max = cxstack_max;
95 cxstack_max = GROW(cxstack_max);
96 Renew(cxstack, cxstack_max + 1, PERL_CONTEXT); /* XXX should fix CXINC macro */
97 /* Without any kind of initialising deep enough recursion
98 * will end up reading uninitialised PERL_CONTEXTs. */
99 Poison(cxstack + old_max + 1, cxstack_max - old_max, PERL_CONTEXT);
100 return cxstack_ix + 1;
101 }
102
103 void
Perl_push_return(pTHX_ OP * retop)104 Perl_push_return(pTHX_ OP *retop)
105 {
106 if (PL_retstack_ix == PL_retstack_max) {
107 PL_retstack_max = GROW(PL_retstack_max);
108 Renew(PL_retstack, PL_retstack_max, OP*);
109 }
110 PL_retstack[PL_retstack_ix++] = retop;
111 }
112
113 OP *
Perl_pop_return(pTHX)114 Perl_pop_return(pTHX)
115 {
116 if (PL_retstack_ix > 0)
117 return PL_retstack[--PL_retstack_ix];
118 else
119 return Nullop;
120 }
121
122 void
Perl_push_scope(pTHX)123 Perl_push_scope(pTHX)
124 {
125 if (PL_scopestack_ix == PL_scopestack_max) {
126 PL_scopestack_max = GROW(PL_scopestack_max);
127 Renew(PL_scopestack, PL_scopestack_max, I32);
128 }
129 PL_scopestack[PL_scopestack_ix++] = PL_savestack_ix;
130
131 }
132
133 void
Perl_pop_scope(pTHX)134 Perl_pop_scope(pTHX)
135 {
136 I32 oldsave = PL_scopestack[--PL_scopestack_ix];
137 LEAVE_SCOPE(oldsave);
138 }
139
140 void
Perl_markstack_grow(pTHX)141 Perl_markstack_grow(pTHX)
142 {
143 I32 oldmax = PL_markstack_max - PL_markstack;
144 I32 newmax = GROW(oldmax);
145
146 Renew(PL_markstack, newmax, I32);
147 PL_markstack_ptr = PL_markstack + oldmax;
148 PL_markstack_max = PL_markstack + newmax;
149 }
150
151 void
Perl_savestack_grow(pTHX)152 Perl_savestack_grow(pTHX)
153 {
154 PL_savestack_max = GROW(PL_savestack_max) + 4;
155 Renew(PL_savestack, PL_savestack_max, ANY);
156 }
157
158 void
Perl_savestack_grow_cnt(pTHX_ I32 need)159 Perl_savestack_grow_cnt(pTHX_ I32 need)
160 {
161 PL_savestack_max = PL_savestack_ix + need;
162 Renew(PL_savestack, PL_savestack_max, ANY);
163 }
164
165 #undef GROW
166
167 void
Perl_tmps_grow(pTHX_ I32 n)168 Perl_tmps_grow(pTHX_ I32 n)
169 {
170 #ifndef STRESS_REALLOC
171 if (n < 128)
172 n = (PL_tmps_max < 512) ? 128 : 512;
173 #endif
174 PL_tmps_max = PL_tmps_ix + n + 1;
175 Renew(PL_tmps_stack, PL_tmps_max, SV*);
176 }
177
178
179 void
Perl_free_tmps(pTHX)180 Perl_free_tmps(pTHX)
181 {
182 /* XXX should tmps_floor live in cxstack? */
183 I32 myfloor = PL_tmps_floor;
184 while (PL_tmps_ix > myfloor) { /* clean up after last statement */
185 SV* sv = PL_tmps_stack[PL_tmps_ix];
186 PL_tmps_stack[PL_tmps_ix--] = Nullsv;
187 if (sv && sv != &PL_sv_undef) {
188 SvTEMP_off(sv);
189 SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */
190 }
191 }
192 }
193
194 STATIC SV *
S_save_scalar_at(pTHX_ SV ** sptr)195 S_save_scalar_at(pTHX_ SV **sptr)
196 {
197 register SV *sv;
198 SV *osv = *sptr;
199
200 sv = *sptr = NEWSV(0,0);
201 if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
202 sv_upgrade(sv, SvTYPE(osv));
203 if (SvGMAGICAL(osv)) {
204 MAGIC* mg;
205 bool oldtainted = PL_tainted;
206 mg_get(osv); /* note, can croak! */
207 if (PL_tainting && PL_tainted &&
208 (mg = mg_find(osv, PERL_MAGIC_taint))) {
209 SAVESPTR(mg->mg_obj);
210 mg->mg_obj = osv;
211 }
212 SvFLAGS(osv) |= (SvFLAGS(osv) &
213 (SVp_NOK|SVp_POK)) >> PRIVSHIFT;
214 PL_tainted = oldtainted;
215 }
216 SvMAGIC(sv) = SvMAGIC(osv);
217 SvFLAGS(sv) |= SvMAGICAL(osv);
218 /* XXX SvMAGIC() is *shared* between osv and sv. This can
219 * lead to coredumps when both SVs are destroyed without one
220 * of their SvMAGIC() slots being NULLed. */
221 PL_localizing = 1;
222 SvSETMAGIC(sv);
223 PL_localizing = 0;
224 }
225 return sv;
226 }
227
228 SV *
Perl_save_scalar(pTHX_ GV * gv)229 Perl_save_scalar(pTHX_ GV *gv)
230 {
231 SV **sptr = &GvSV(gv);
232 SSCHECK(3);
233 SSPUSHPTR(SvREFCNT_inc(gv));
234 SSPUSHPTR(SvREFCNT_inc(*sptr));
235 SSPUSHINT(SAVEt_SV);
236 return save_scalar_at(sptr);
237 }
238
239 SV*
Perl_save_svref(pTHX_ SV ** sptr)240 Perl_save_svref(pTHX_ SV **sptr)
241 {
242 SSCHECK(3);
243 SSPUSHPTR(sptr);
244 SSPUSHPTR(SvREFCNT_inc(*sptr));
245 SSPUSHINT(SAVEt_SVREF);
246 return save_scalar_at(sptr);
247 }
248
249 /* Like save_sptr(), but also SvREFCNT_dec()s the new value. Can be used to
250 * restore a global SV to its prior contents, freeing new value. */
251 void
Perl_save_generic_svref(pTHX_ SV ** sptr)252 Perl_save_generic_svref(pTHX_ SV **sptr)
253 {
254 SSCHECK(3);
255 SSPUSHPTR(sptr);
256 SSPUSHPTR(SvREFCNT_inc(*sptr));
257 SSPUSHINT(SAVEt_GENERIC_SVREF);
258 }
259
260 /* Like save_pptr(), but also Safefree()s the new value if it is different
261 * from the old one. Can be used to restore a global char* to its prior
262 * contents, freeing new value. */
263 void
Perl_save_generic_pvref(pTHX_ char ** str)264 Perl_save_generic_pvref(pTHX_ char **str)
265 {
266 SSCHECK(3);
267 SSPUSHPTR(str);
268 SSPUSHPTR(*str);
269 SSPUSHINT(SAVEt_GENERIC_PVREF);
270 }
271
272 /* Like save_generic_pvref(), but uses PerlMemShared_free() rather than Safefree().
273 * Can be used to restore a shared global char* to its prior
274 * contents, freeing new value. */
275 void
Perl_save_shared_pvref(pTHX_ char ** str)276 Perl_save_shared_pvref(pTHX_ char **str)
277 {
278 SSCHECK(3);
279 SSPUSHPTR(str);
280 SSPUSHPTR(*str);
281 SSPUSHINT(SAVEt_SHARED_PVREF);
282 }
283
284 void
Perl_save_gp(pTHX_ GV * gv,I32 empty)285 Perl_save_gp(pTHX_ GV *gv, I32 empty)
286 {
287 SSGROW(6);
288 SSPUSHIV((IV)SvLEN(gv));
289 SvLEN(gv) = 0; /* forget that anything was allocated here */
290 SSPUSHIV((IV)SvCUR(gv));
291 SSPUSHPTR(SvPVX(gv));
292 SvPOK_off(gv);
293 SSPUSHPTR(SvREFCNT_inc(gv));
294 SSPUSHPTR(GvGP(gv));
295 SSPUSHINT(SAVEt_GP);
296
297 if (empty) {
298 register GP *gp;
299
300 Newz(602, gp, 1, GP);
301
302 if (GvCVu(gv))
303 PL_sub_generation++; /* taking a method out of circulation */
304 if (GvIOp(gv) && (IoFLAGS(GvIOp(gv)) & IOf_ARGV)) {
305 gp->gp_io = newIO();
306 IoFLAGS(gp->gp_io) |= IOf_ARGV|IOf_START;
307 }
308 GvGP(gv) = gp_ref(gp);
309 GvSV(gv) = NEWSV(72,0);
310 GvLINE(gv) = CopLINE(PL_curcop);
311 GvFILE(gv) = CopFILE(PL_curcop) ? CopFILE(PL_curcop) : "";
312 GvEGV(gv) = gv;
313 }
314 else {
315 gp_ref(GvGP(gv));
316 GvINTRO_on(gv);
317 }
318 }
319
320 AV *
Perl_save_ary(pTHX_ GV * gv)321 Perl_save_ary(pTHX_ GV *gv)
322 {
323 AV *oav = GvAVn(gv);
324 AV *av;
325
326 if (!AvREAL(oav) && AvREIFY(oav))
327 av_reify(oav);
328 SSCHECK(3);
329 SSPUSHPTR(gv);
330 SSPUSHPTR(oav);
331 SSPUSHINT(SAVEt_AV);
332
333 GvAV(gv) = Null(AV*);
334 av = GvAVn(gv);
335 if (SvMAGIC(oav)) {
336 SvMAGIC(av) = SvMAGIC(oav);
337 SvFLAGS((SV*)av) |= SvMAGICAL(oav);
338 SvMAGICAL_off(oav);
339 SvMAGIC(oav) = 0;
340 PL_localizing = 1;
341 SvSETMAGIC((SV*)av);
342 PL_localizing = 0;
343 }
344 return av;
345 }
346
347 HV *
Perl_save_hash(pTHX_ GV * gv)348 Perl_save_hash(pTHX_ GV *gv)
349 {
350 HV *ohv, *hv;
351
352 SSCHECK(3);
353 SSPUSHPTR(gv);
354 SSPUSHPTR(ohv = GvHVn(gv));
355 SSPUSHINT(SAVEt_HV);
356
357 GvHV(gv) = Null(HV*);
358 hv = GvHVn(gv);
359 if (SvMAGIC(ohv)) {
360 SvMAGIC(hv) = SvMAGIC(ohv);
361 SvFLAGS((SV*)hv) |= SvMAGICAL(ohv);
362 SvMAGICAL_off(ohv);
363 SvMAGIC(ohv) = 0;
364 PL_localizing = 1;
365 SvSETMAGIC((SV*)hv);
366 PL_localizing = 0;
367 }
368 return hv;
369 }
370
371 void
Perl_save_item(pTHX_ register SV * item)372 Perl_save_item(pTHX_ register SV *item)
373 {
374 register SV *sv = NEWSV(0,0);
375
376 sv_setsv(sv,item);
377 SSCHECK(3);
378 SSPUSHPTR(item); /* remember the pointer */
379 SSPUSHPTR(sv); /* remember the value */
380 SSPUSHINT(SAVEt_ITEM);
381 }
382
383 void
Perl_save_int(pTHX_ int * intp)384 Perl_save_int(pTHX_ int *intp)
385 {
386 SSCHECK(3);
387 SSPUSHINT(*intp);
388 SSPUSHPTR(intp);
389 SSPUSHINT(SAVEt_INT);
390 }
391
392 void
Perl_save_long(pTHX_ long int * longp)393 Perl_save_long(pTHX_ long int *longp)
394 {
395 SSCHECK(3);
396 SSPUSHLONG(*longp);
397 SSPUSHPTR(longp);
398 SSPUSHINT(SAVEt_LONG);
399 }
400
401 void
Perl_save_bool(pTHX_ bool * boolp)402 Perl_save_bool(pTHX_ bool *boolp)
403 {
404 SSCHECK(3);
405 SSPUSHBOOL(*boolp);
406 SSPUSHPTR(boolp);
407 SSPUSHINT(SAVEt_BOOL);
408 }
409
410 void
Perl_save_I32(pTHX_ I32 * intp)411 Perl_save_I32(pTHX_ I32 *intp)
412 {
413 SSCHECK(3);
414 SSPUSHINT(*intp);
415 SSPUSHPTR(intp);
416 SSPUSHINT(SAVEt_I32);
417 }
418
419 void
Perl_save_I16(pTHX_ I16 * intp)420 Perl_save_I16(pTHX_ I16 *intp)
421 {
422 SSCHECK(3);
423 SSPUSHINT(*intp);
424 SSPUSHPTR(intp);
425 SSPUSHINT(SAVEt_I16);
426 }
427
428 void
Perl_save_I8(pTHX_ I8 * bytep)429 Perl_save_I8(pTHX_ I8 *bytep)
430 {
431 SSCHECK(3);
432 SSPUSHINT(*bytep);
433 SSPUSHPTR(bytep);
434 SSPUSHINT(SAVEt_I8);
435 }
436
437 void
Perl_save_iv(pTHX_ IV * ivp)438 Perl_save_iv(pTHX_ IV *ivp)
439 {
440 SSCHECK(3);
441 SSPUSHIV(*ivp);
442 SSPUSHPTR(ivp);
443 SSPUSHINT(SAVEt_IV);
444 }
445
446 /* Cannot use save_sptr() to store a char* since the SV** cast will
447 * force word-alignment and we'll miss the pointer.
448 */
449 void
Perl_save_pptr(pTHX_ char ** pptr)450 Perl_save_pptr(pTHX_ char **pptr)
451 {
452 SSCHECK(3);
453 SSPUSHPTR(*pptr);
454 SSPUSHPTR(pptr);
455 SSPUSHINT(SAVEt_PPTR);
456 }
457
458 void
Perl_save_vptr(pTHX_ void * ptr)459 Perl_save_vptr(pTHX_ void *ptr)
460 {
461 SSCHECK(3);
462 SSPUSHPTR(*(char**)ptr);
463 SSPUSHPTR(ptr);
464 SSPUSHINT(SAVEt_VPTR);
465 }
466
467 void
Perl_save_sptr(pTHX_ SV ** sptr)468 Perl_save_sptr(pTHX_ SV **sptr)
469 {
470 SSCHECK(3);
471 SSPUSHPTR(*sptr);
472 SSPUSHPTR(sptr);
473 SSPUSHINT(SAVEt_SPTR);
474 }
475
476 void
Perl_save_padsv(pTHX_ PADOFFSET off)477 Perl_save_padsv(pTHX_ PADOFFSET off)
478 {
479 SSCHECK(4);
480 ASSERT_CURPAD_ACTIVE("save_padsv");
481 SSPUSHPTR(PL_curpad[off]);
482 SSPUSHPTR(PL_comppad);
483 SSPUSHLONG((long)off);
484 SSPUSHINT(SAVEt_PADSV);
485 }
486
487 SV **
Perl_save_threadsv(pTHX_ PADOFFSET i)488 Perl_save_threadsv(pTHX_ PADOFFSET i)
489 {
490 #ifdef USE_5005THREADS
491 SV **svp = &THREADSV(i); /* XXX Change to save by offset */
492 DEBUG_S(PerlIO_printf(Perl_debug_log, "save_threadsv %"UVuf": %p %p:%s\n",
493 (UV)i, svp, *svp, SvPEEK(*svp)));
494 save_svref(svp);
495 return svp;
496 #else
497 Perl_croak(aTHX_ "panic: save_threadsv called in non-threaded perl");
498 return 0;
499 #endif /* USE_5005THREADS */
500 }
501
502 void
Perl_save_nogv(pTHX_ GV * gv)503 Perl_save_nogv(pTHX_ GV *gv)
504 {
505 SSCHECK(2);
506 SSPUSHPTR(gv);
507 SSPUSHINT(SAVEt_NSTAB);
508 }
509
510 void
Perl_save_hptr(pTHX_ HV ** hptr)511 Perl_save_hptr(pTHX_ HV **hptr)
512 {
513 SSCHECK(3);
514 SSPUSHPTR(*hptr);
515 SSPUSHPTR(hptr);
516 SSPUSHINT(SAVEt_HPTR);
517 }
518
519 void
Perl_save_aptr(pTHX_ AV ** aptr)520 Perl_save_aptr(pTHX_ AV **aptr)
521 {
522 SSCHECK(3);
523 SSPUSHPTR(*aptr);
524 SSPUSHPTR(aptr);
525 SSPUSHINT(SAVEt_APTR);
526 }
527
528 void
Perl_save_freesv(pTHX_ SV * sv)529 Perl_save_freesv(pTHX_ SV *sv)
530 {
531 SSCHECK(2);
532 SSPUSHPTR(sv);
533 SSPUSHINT(SAVEt_FREESV);
534 }
535
536 void
Perl_save_mortalizesv(pTHX_ SV * sv)537 Perl_save_mortalizesv(pTHX_ SV *sv)
538 {
539 SSCHECK(2);
540 SSPUSHPTR(sv);
541 SSPUSHINT(SAVEt_MORTALIZESV);
542 }
543
544 void
Perl_save_freeop(pTHX_ OP * o)545 Perl_save_freeop(pTHX_ OP *o)
546 {
547 SSCHECK(2);
548 SSPUSHPTR(o);
549 SSPUSHINT(SAVEt_FREEOP);
550 }
551
552 void
Perl_save_freepv(pTHX_ char * pv)553 Perl_save_freepv(pTHX_ char *pv)
554 {
555 SSCHECK(2);
556 SSPUSHPTR(pv);
557 SSPUSHINT(SAVEt_FREEPV);
558 }
559
560 void
Perl_save_clearsv(pTHX_ SV ** svp)561 Perl_save_clearsv(pTHX_ SV **svp)
562 {
563 ASSERT_CURPAD_ACTIVE("save_clearsv");
564 SSCHECK(2);
565 SSPUSHLONG((long)(svp-PL_curpad));
566 SSPUSHINT(SAVEt_CLEARSV);
567 }
568
569 void
Perl_save_delete(pTHX_ HV * hv,char * key,I32 klen)570 Perl_save_delete(pTHX_ HV *hv, char *key, I32 klen)
571 {
572 SSCHECK(4);
573 SSPUSHINT(klen);
574 SSPUSHPTR(key);
575 SSPUSHPTR(SvREFCNT_inc(hv));
576 SSPUSHINT(SAVEt_DELETE);
577 }
578
579 void
Perl_save_list(pTHX_ register SV ** sarg,I32 maxsarg)580 Perl_save_list(pTHX_ register SV **sarg, I32 maxsarg)
581 {
582 register SV *sv;
583 register I32 i;
584
585 for (i = 1; i <= maxsarg; i++) {
586 sv = NEWSV(0,0);
587 sv_setsv(sv,sarg[i]);
588 SSCHECK(3);
589 SSPUSHPTR(sarg[i]); /* remember the pointer */
590 SSPUSHPTR(sv); /* remember the value */
591 SSPUSHINT(SAVEt_ITEM);
592 }
593 }
594
595 void
Perl_save_destructor(pTHX_ DESTRUCTORFUNC_NOCONTEXT_t f,void * p)596 Perl_save_destructor(pTHX_ DESTRUCTORFUNC_NOCONTEXT_t f, void* p)
597 {
598 SSCHECK(3);
599 SSPUSHDPTR(f);
600 SSPUSHPTR(p);
601 SSPUSHINT(SAVEt_DESTRUCTOR);
602 }
603
604 void
Perl_save_destructor_x(pTHX_ DESTRUCTORFUNC_t f,void * p)605 Perl_save_destructor_x(pTHX_ DESTRUCTORFUNC_t f, void* p)
606 {
607 SSCHECK(3);
608 SSPUSHDXPTR(f);
609 SSPUSHPTR(p);
610 SSPUSHINT(SAVEt_DESTRUCTOR_X);
611 }
612
613 void
Perl_save_aelem(pTHX_ AV * av,I32 idx,SV ** sptr)614 Perl_save_aelem(pTHX_ AV *av, I32 idx, SV **sptr)
615 {
616 SV *sv;
617 SSCHECK(4);
618 SSPUSHPTR(SvREFCNT_inc(av));
619 SSPUSHINT(idx);
620 SSPUSHPTR(SvREFCNT_inc(*sptr));
621 SSPUSHINT(SAVEt_AELEM);
622 /* if it gets reified later, the restore will have the wrong refcnt */
623 if (!AvREAL(av) && AvREIFY(av))
624 SvREFCNT_inc(*sptr);
625 save_scalar_at(sptr);
626 sv = *sptr;
627 /* If we're localizing a tied array element, this new sv
628 * won't actually be stored in the array - so it won't get
629 * reaped when the localize ends. Ensure it gets reaped by
630 * mortifying it instead. DAPM */
631 if (SvTIED_mg(sv, PERL_MAGIC_tiedelem))
632 sv_2mortal(sv);
633 }
634
635 void
Perl_save_helem(pTHX_ HV * hv,SV * key,SV ** sptr)636 Perl_save_helem(pTHX_ HV *hv, SV *key, SV **sptr)
637 {
638 SV *sv;
639 SSCHECK(4);
640 SSPUSHPTR(SvREFCNT_inc(hv));
641 SSPUSHPTR(SvREFCNT_inc(key));
642 SSPUSHPTR(SvREFCNT_inc(*sptr));
643 SSPUSHINT(SAVEt_HELEM);
644 save_scalar_at(sptr);
645 sv = *sptr;
646 /* If we're localizing a tied hash element, this new sv
647 * won't actually be stored in the hash - so it won't get
648 * reaped when the localize ends. Ensure it gets reaped by
649 * mortifying it instead. DAPM */
650 if (SvTIED_mg(sv, PERL_MAGIC_tiedelem))
651 sv_2mortal(sv);
652 }
653
654 void
Perl_save_op(pTHX)655 Perl_save_op(pTHX)
656 {
657 SSCHECK(2);
658 SSPUSHPTR(PL_op);
659 SSPUSHINT(SAVEt_OP);
660 }
661
662 I32
Perl_save_alloc(pTHX_ I32 size,I32 pad)663 Perl_save_alloc(pTHX_ I32 size, I32 pad)
664 {
665 register I32 start = pad + ((char*)&PL_savestack[PL_savestack_ix]
666 - (char*)PL_savestack);
667 register I32 elems = 1 + ((size + pad - 1) / sizeof(*PL_savestack));
668
669 /* SSCHECK may not be good enough */
670 while (PL_savestack_ix + elems + 2 > PL_savestack_max)
671 savestack_grow();
672
673 PL_savestack_ix += elems;
674 SSPUSHINT(elems);
675 SSPUSHINT(SAVEt_ALLOC);
676 return start;
677 }
678
679 void
Perl_leave_scope(pTHX_ I32 base)680 Perl_leave_scope(pTHX_ I32 base)
681 {
682 register SV *sv;
683 register SV *value;
684 register GV *gv;
685 register AV *av;
686 register HV *hv;
687 register void* ptr;
688 register char* str;
689 I32 i;
690
691 if (base < -1)
692 Perl_croak(aTHX_ "panic: corrupt saved stack index");
693 while (PL_savestack_ix > base) {
694 switch (SSPOPINT) {
695 case SAVEt_ITEM: /* normal string */
696 value = (SV*)SSPOPPTR;
697 sv = (SV*)SSPOPPTR;
698 sv_replace(sv,value);
699 PL_localizing = 2;
700 SvSETMAGIC(sv);
701 PL_localizing = 0;
702 break;
703 case SAVEt_SV: /* scalar reference */
704 value = (SV*)SSPOPPTR;
705 gv = (GV*)SSPOPPTR;
706 ptr = &GvSV(gv);
707 av = (AV*)gv; /* what to refcnt_dec */
708 goto restore_sv;
709 case SAVEt_GENERIC_PVREF: /* generic pv */
710 str = (char*)SSPOPPTR;
711 ptr = SSPOPPTR;
712 if (*(char**)ptr != str) {
713 Safefree(*(char**)ptr);
714 *(char**)ptr = str;
715 }
716 break;
717 case SAVEt_SHARED_PVREF: /* shared pv */
718 str = (char*)SSPOPPTR;
719 ptr = SSPOPPTR;
720 if (*(char**)ptr != str) {
721 #ifdef NETWARE
722 PerlMem_free(*(char**)ptr);
723 #else
724 PerlMemShared_free(*(char**)ptr);
725 #endif
726 *(char**)ptr = str;
727 }
728 break;
729 case SAVEt_GENERIC_SVREF: /* generic sv */
730 value = (SV*)SSPOPPTR;
731 ptr = SSPOPPTR;
732 sv = *(SV**)ptr;
733 *(SV**)ptr = value;
734 SvREFCNT_dec(sv);
735 SvREFCNT_dec(value);
736 break;
737 case SAVEt_SVREF: /* scalar reference */
738 value = (SV*)SSPOPPTR;
739 ptr = SSPOPPTR;
740 av = Nullav; /* what to refcnt_dec */
741 restore_sv:
742 sv = *(SV**)ptr;
743 DEBUG_S(PerlIO_printf(Perl_debug_log,
744 "restore svref: %p %p:%s -> %p:%s\n",
745 ptr, sv, SvPEEK(sv), value, SvPEEK(value)));
746 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
747 SvTYPE(sv) != SVt_PVGV)
748 {
749 (void)SvUPGRADE(value, SvTYPE(sv));
750 SvMAGIC(value) = SvMAGIC(sv);
751 SvFLAGS(value) |= SvMAGICAL(sv);
752 SvMAGICAL_off(sv);
753 SvMAGIC(sv) = 0;
754 }
755 /* XXX This branch is pretty bogus. This code irretrievably
756 * clears(!) the magic on the SV (either to avoid further
757 * croaking that might ensue when the SvSETMAGIC() below is
758 * called, or to avoid two different SVs pointing at the same
759 * SvMAGIC()). This needs a total rethink. --GSAR */
760 else if (SvTYPE(value) >= SVt_PVMG && SvMAGIC(value) &&
761 SvTYPE(value) != SVt_PVGV)
762 {
763 SvFLAGS(value) |= (SvFLAGS(value) &
764 (SVp_NOK|SVp_POK)) >> PRIVSHIFT;
765 SvMAGICAL_off(value);
766 /* XXX this is a leak when we get here because the
767 * mg_get() in save_scalar_at() croaked */
768 SvMAGIC(value) = 0;
769 }
770 *(SV**)ptr = value;
771 SvREFCNT_dec(sv);
772 PL_localizing = 2;
773 SvSETMAGIC(value);
774 PL_localizing = 0;
775 SvREFCNT_dec(value);
776 if (av) /* actually an av, hv or gv */
777 SvREFCNT_dec(av);
778 break;
779 case SAVEt_AV: /* array reference */
780 av = (AV*)SSPOPPTR;
781 gv = (GV*)SSPOPPTR;
782 if (GvAV(gv)) {
783 AV *goner = GvAV(gv);
784 SvMAGIC(av) = SvMAGIC(goner);
785 SvFLAGS((SV*)av) |= SvMAGICAL(goner);
786 SvMAGICAL_off(goner);
787 SvMAGIC(goner) = 0;
788 SvREFCNT_dec(goner);
789 }
790 GvAV(gv) = av;
791 if (SvMAGICAL(av)) {
792 PL_localizing = 2;
793 SvSETMAGIC((SV*)av);
794 PL_localizing = 0;
795 }
796 break;
797 case SAVEt_HV: /* hash reference */
798 hv = (HV*)SSPOPPTR;
799 gv = (GV*)SSPOPPTR;
800 if (GvHV(gv)) {
801 HV *goner = GvHV(gv);
802 SvMAGIC(hv) = SvMAGIC(goner);
803 SvFLAGS(hv) |= SvMAGICAL(goner);
804 SvMAGICAL_off(goner);
805 SvMAGIC(goner) = 0;
806 SvREFCNT_dec(goner);
807 }
808 GvHV(gv) = hv;
809 if (SvMAGICAL(hv)) {
810 PL_localizing = 2;
811 SvSETMAGIC((SV*)hv);
812 PL_localizing = 0;
813 }
814 break;
815 case SAVEt_INT: /* int reference */
816 ptr = SSPOPPTR;
817 *(int*)ptr = (int)SSPOPINT;
818 break;
819 case SAVEt_LONG: /* long reference */
820 ptr = SSPOPPTR;
821 *(long*)ptr = (long)SSPOPLONG;
822 break;
823 case SAVEt_BOOL: /* bool reference */
824 ptr = SSPOPPTR;
825 *(bool*)ptr = (bool)SSPOPBOOL;
826 break;
827 case SAVEt_I32: /* I32 reference */
828 ptr = SSPOPPTR;
829 *(I32*)ptr = (I32)SSPOPINT;
830 break;
831 case SAVEt_I16: /* I16 reference */
832 ptr = SSPOPPTR;
833 *(I16*)ptr = (I16)SSPOPINT;
834 break;
835 case SAVEt_I8: /* I8 reference */
836 ptr = SSPOPPTR;
837 *(I8*)ptr = (I8)SSPOPINT;
838 break;
839 case SAVEt_IV: /* IV reference */
840 ptr = SSPOPPTR;
841 *(IV*)ptr = (IV)SSPOPIV;
842 break;
843 case SAVEt_SPTR: /* SV* reference */
844 ptr = SSPOPPTR;
845 *(SV**)ptr = (SV*)SSPOPPTR;
846 break;
847 case SAVEt_VPTR: /* random* reference */
848 case SAVEt_PPTR: /* char* reference */
849 ptr = SSPOPPTR;
850 *(char**)ptr = (char*)SSPOPPTR;
851 break;
852 case SAVEt_HPTR: /* HV* reference */
853 ptr = SSPOPPTR;
854 *(HV**)ptr = (HV*)SSPOPPTR;
855 break;
856 case SAVEt_APTR: /* AV* reference */
857 ptr = SSPOPPTR;
858 *(AV**)ptr = (AV*)SSPOPPTR;
859 break;
860 case SAVEt_NSTAB:
861 gv = (GV*)SSPOPPTR;
862 (void)sv_clear((SV*)gv);
863 break;
864 case SAVEt_GP: /* scalar reference */
865 ptr = SSPOPPTR;
866 gv = (GV*)SSPOPPTR;
867 if (SvPVX(gv) && SvLEN(gv) > 0) {
868 Safefree(SvPVX(gv));
869 }
870 SvPVX(gv) = (char *)SSPOPPTR;
871 SvCUR(gv) = (STRLEN)SSPOPIV;
872 SvLEN(gv) = (STRLEN)SSPOPIV;
873 gp_free(gv);
874 GvGP(gv) = (GP*)ptr;
875 if (GvCVu(gv))
876 PL_sub_generation++; /* putting a method back into circulation */
877 SvREFCNT_dec(gv);
878 break;
879 case SAVEt_FREESV:
880 ptr = SSPOPPTR;
881 SvREFCNT_dec((SV*)ptr);
882 break;
883 case SAVEt_MORTALIZESV:
884 ptr = SSPOPPTR;
885 sv_2mortal((SV*)ptr);
886 break;
887 case SAVEt_FREEOP:
888 ptr = SSPOPPTR;
889 ASSERT_CURPAD_LEGAL("SAVEt_FREEOP"); /* XXX DAPM tmp */
890 op_free((OP*)ptr);
891 break;
892 case SAVEt_FREEPV:
893 ptr = SSPOPPTR;
894 Safefree((char*)ptr);
895 break;
896 case SAVEt_CLEARSV:
897 ptr = (void*)&PL_curpad[SSPOPLONG];
898 sv = *(SV**)ptr;
899
900 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
901 "Pad 0x%"UVxf"[0x%"UVxf"] clearsv: %ld sv=0x%"UVxf"<%"IVdf"> %s\n",
902 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
903 (long)((SV **)ptr-PL_curpad), PTR2UV(sv), (IV)SvREFCNT(sv),
904 (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) ? "clear" : "abandon"
905 ));
906
907 /* Can clear pad variable in place? */
908 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
909 /*
910 * if a my variable that was made readonly is going out of
911 * scope, we want to remove the readonlyness so that it can
912 * go out of scope quietly
913 */
914 if (SvPADMY(sv) && !SvFAKE(sv))
915 SvREADONLY_off(sv);
916
917 if (SvTHINKFIRST(sv))
918 sv_force_normal_flags(sv, SV_IMMEDIATE_UNREF);
919 if (SvMAGICAL(sv))
920 mg_free(sv);
921
922 switch (SvTYPE(sv)) {
923 case SVt_NULL:
924 break;
925 case SVt_PVAV:
926 av_clear((AV*)sv);
927 break;
928 case SVt_PVHV:
929 hv_clear((HV*)sv);
930 break;
931 case SVt_PVCV:
932 Perl_croak(aTHX_ "panic: leave_scope pad code");
933 case SVt_RV:
934 case SVt_IV:
935 case SVt_NV:
936 (void)SvOK_off(sv);
937 break;
938 default:
939 (void)SvOK_off(sv);
940 (void)SvOOK_off(sv);
941 break;
942 }
943 }
944 else { /* Someone has a claim on this, so abandon it. */
945 U32 padflags = SvFLAGS(sv) & (SVs_PADBUSY|SVs_PADMY|SVs_PADTMP);
946 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
947 case SVt_PVAV: *(SV**)ptr = (SV*)newAV(); break;
948 case SVt_PVHV: *(SV**)ptr = (SV*)newHV(); break;
949 default: *(SV**)ptr = NEWSV(0,0); break;
950 }
951 SvREFCNT_dec(sv); /* Cast current value to the winds. */
952 SvFLAGS(*(SV**)ptr) |= padflags; /* preserve pad nature */
953 }
954 break;
955 case SAVEt_DELETE:
956 ptr = SSPOPPTR;
957 hv = (HV*)ptr;
958 ptr = SSPOPPTR;
959 (void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
960 SvREFCNT_dec(hv);
961 Safefree(ptr);
962 break;
963 case SAVEt_DESTRUCTOR:
964 ptr = SSPOPPTR;
965 (*SSPOPDPTR)(ptr);
966 break;
967 case SAVEt_DESTRUCTOR_X:
968 ptr = SSPOPPTR;
969 (*SSPOPDXPTR)(aTHX_ ptr);
970 break;
971 case SAVEt_REGCONTEXT:
972 case SAVEt_ALLOC:
973 i = SSPOPINT;
974 PL_savestack_ix -= i; /* regexp must have croaked */
975 break;
976 case SAVEt_STACK_POS: /* Position on Perl stack */
977 i = SSPOPINT;
978 PL_stack_sp = PL_stack_base + i;
979 break;
980 case SAVEt_AELEM: /* array element */
981 value = (SV*)SSPOPPTR;
982 i = SSPOPINT;
983 av = (AV*)SSPOPPTR;
984 if (!AvREAL(av) && AvREIFY(av)) /* undo reify guard */
985 SvREFCNT_dec(value);
986 ptr = av_fetch(av,i,1);
987 if (ptr) {
988 sv = *(SV**)ptr;
989 if (sv && sv != &PL_sv_undef) {
990 if (SvTIED_mg((SV*)av, PERL_MAGIC_tied))
991 (void)SvREFCNT_inc(sv);
992 goto restore_sv;
993 }
994 }
995 SvREFCNT_dec(av);
996 SvREFCNT_dec(value);
997 break;
998 case SAVEt_HELEM: /* hash element */
999 value = (SV*)SSPOPPTR;
1000 sv = (SV*)SSPOPPTR;
1001 hv = (HV*)SSPOPPTR;
1002 ptr = hv_fetch_ent(hv, sv, 1, 0);
1003 if (ptr) {
1004 SV *oval = HeVAL((HE*)ptr);
1005 if (oval && oval != &PL_sv_undef) {
1006 ptr = &HeVAL((HE*)ptr);
1007 if (SvTIED_mg((SV*)hv, PERL_MAGIC_tied))
1008 (void)SvREFCNT_inc(*(SV**)ptr);
1009 SvREFCNT_dec(sv);
1010 av = (AV*)hv; /* what to refcnt_dec */
1011 goto restore_sv;
1012 }
1013 }
1014 SvREFCNT_dec(hv);
1015 SvREFCNT_dec(sv);
1016 SvREFCNT_dec(value);
1017 break;
1018 case SAVEt_OP:
1019 PL_op = (OP*)SSPOPPTR;
1020 break;
1021 case SAVEt_HINTS:
1022 if ((PL_hints & HINT_LOCALIZE_HH) && GvHV(PL_hintgv)) {
1023 SvREFCNT_dec((SV*)GvHV(PL_hintgv));
1024 GvHV(PL_hintgv) = NULL;
1025 }
1026 *(I32*)&PL_hints = (I32)SSPOPINT;
1027 if (PL_hints & HINT_LOCALIZE_HH) {
1028 SvREFCNT_dec((SV*)GvHV(PL_hintgv));
1029 GvHV(PL_hintgv) = (HV*)SSPOPPTR;
1030 }
1031
1032 break;
1033 case SAVEt_COMPPAD:
1034 PL_comppad = (PAD*)SSPOPPTR;
1035 if (PL_comppad)
1036 PL_curpad = AvARRAY(PL_comppad);
1037 else
1038 PL_curpad = Null(SV**);
1039 break;
1040 case SAVEt_PADSV:
1041 {
1042 PADOFFSET off = (PADOFFSET)SSPOPLONG;
1043 ptr = SSPOPPTR;
1044 if (ptr)
1045 AvARRAY((PAD*)ptr)[off] = (SV*)SSPOPPTR;
1046 }
1047 break;
1048 default:
1049 Perl_croak(aTHX_ "panic: leave_scope inconsistency");
1050 }
1051 }
1052 }
1053
1054 void
Perl_cx_dump(pTHX_ PERL_CONTEXT * cx)1055 Perl_cx_dump(pTHX_ PERL_CONTEXT *cx)
1056 {
1057 #ifdef DEBUGGING
1058 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]);
1059 if (CxTYPE(cx) != CXt_SUBST) {
1060 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
1061 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%"UVxf"\n",
1062 PTR2UV(cx->blk_oldcop));
1063 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
1064 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
1065 PerlIO_printf(Perl_debug_log, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
1066 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%"UVxf"\n",
1067 PTR2UV(cx->blk_oldpm));
1068 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
1069 }
1070 switch (CxTYPE(cx)) {
1071 case CXt_NULL:
1072 case CXt_BLOCK:
1073 break;
1074 case CXt_FORMAT:
1075 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%"UVxf"\n",
1076 PTR2UV(cx->blk_sub.cv));
1077 PerlIO_printf(Perl_debug_log, "BLK_SUB.GV = 0x%"UVxf"\n",
1078 PTR2UV(cx->blk_sub.gv));
1079 PerlIO_printf(Perl_debug_log, "BLK_SUB.DFOUTGV = 0x%"UVxf"\n",
1080 PTR2UV(cx->blk_sub.dfoutgv));
1081 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
1082 (int)cx->blk_sub.hasargs);
1083 break;
1084 case CXt_SUB:
1085 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%"UVxf"\n",
1086 PTR2UV(cx->blk_sub.cv));
1087 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
1088 (long)cx->blk_sub.olddepth);
1089 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
1090 (int)cx->blk_sub.hasargs);
1091 PerlIO_printf(Perl_debug_log, "BLK_SUB.LVAL = %d\n",
1092 (int)cx->blk_sub.lval);
1093 break;
1094 case CXt_EVAL:
1095 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
1096 (long)cx->blk_eval.old_in_eval);
1097 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
1098 PL_op_name[cx->blk_eval.old_op_type],
1099 PL_op_desc[cx->blk_eval.old_op_type]);
1100 if (cx->blk_eval.old_namesv)
1101 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
1102 SvPVX(cx->blk_eval.old_namesv));
1103 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%"UVxf"\n",
1104 PTR2UV(cx->blk_eval.old_eval_root));
1105 break;
1106
1107 case CXt_LOOP:
1108 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n",
1109 cx->blk_loop.label);
1110 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
1111 (long)cx->blk_loop.resetsp);
1112 PerlIO_printf(Perl_debug_log, "BLK_LOOP.REDO_OP = 0x%"UVxf"\n",
1113 PTR2UV(cx->blk_loop.redo_op));
1114 PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%"UVxf"\n",
1115 PTR2UV(cx->blk_loop.next_op));
1116 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LAST_OP = 0x%"UVxf"\n",
1117 PTR2UV(cx->blk_loop.last_op));
1118 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
1119 (long)cx->blk_loop.iterix);
1120 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%"UVxf"\n",
1121 PTR2UV(cx->blk_loop.iterary));
1122 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%"UVxf"\n",
1123 PTR2UV(CxITERVAR(cx)));
1124 if (CxITERVAR(cx))
1125 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%"UVxf"\n",
1126 PTR2UV(cx->blk_loop.itersave));
1127 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERLVAL = 0x%"UVxf"\n",
1128 PTR2UV(cx->blk_loop.iterlval));
1129 break;
1130
1131 case CXt_SUBST:
1132 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
1133 (long)cx->sb_iters);
1134 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
1135 (long)cx->sb_maxiters);
1136 PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n",
1137 (long)cx->sb_rflags);
1138 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
1139 (long)cx->sb_once);
1140 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
1141 cx->sb_orig);
1142 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%"UVxf"\n",
1143 PTR2UV(cx->sb_dstr));
1144 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%"UVxf"\n",
1145 PTR2UV(cx->sb_targ));
1146 PerlIO_printf(Perl_debug_log, "SB_S = 0x%"UVxf"\n",
1147 PTR2UV(cx->sb_s));
1148 PerlIO_printf(Perl_debug_log, "SB_M = 0x%"UVxf"\n",
1149 PTR2UV(cx->sb_m));
1150 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%"UVxf"\n",
1151 PTR2UV(cx->sb_strend));
1152 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%"UVxf"\n",
1153 PTR2UV(cx->sb_rxres));
1154 break;
1155 }
1156 #endif /* DEBUGGING */
1157 }
1158