source: vendor/perl/5.8.8/scope.c@ 3560

Last change on this file since 3560 was 3181, checked in by bird, 19 years ago

perl 5.8.8
File size: 28.5 KB
Line 
1/* scope.c
2 *
3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 * 2000, 2001, 2002, 2003, 2004, 2005, 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/* This file contains functions to manipulate several of Perl's stacks;
17 * in particular it contains code to push various types of things onto
18 * the savestack, then to pop them off and perform the correct restorative
19 * action for each one. This corresponds to the cleanup Perl does at
20 * each scope exit.
21 */
22
23#include "EXTERN.h"
24#define PERL_IN_SCOPE_C
25#include "perl.h"
26
27#if defined(PERL_FLEXIBLE_EXCEPTIONS)
28void *
29Perl_default_protect(pTHX_ volatile JMPENV *pcur_env, int *excpt,
30 protect_body_t body, ...)
31{
32 void *ret;
33 va_list args;
34 va_start(args, body);
35 ret = vdefault_protect(pcur_env, excpt, body, &args);
36 va_end(args);
37 return ret;
38}
39
40void *
41Perl_vdefault_protect(pTHX_ volatile JMPENV *pcur_env, int *excpt,
42 protect_body_t body, va_list *args)
43{
44 int ex;
45 void *ret;
46
47 JMPENV_PUSH(ex);
48 if (ex)
49 ret = NULL;
50 else
51 ret = CALL_FPTR(body)(aTHX_ *args);
52 *excpt = ex;
53 JMPENV_POP;
54 return ret;
55}
56#endif
57
58SV**
59Perl_stack_grow(pTHX_ SV **sp, SV **p, int n)
60{
61 PL_stack_sp = sp;
62#ifndef STRESS_REALLOC
63 av_extend(PL_curstack, (p - PL_stack_base) + (n) + 128);
64#else
65 av_extend(PL_curstack, (p - PL_stack_base) + (n) + 1);
66#endif
67 return PL_stack_sp;
68}
69
70#ifndef STRESS_REALLOC
71#define GROW(old) ((old) * 3 / 2)
72#else
73#define GROW(old) ((old) + 1)
74#endif
75
76PERL_SI *
77Perl_new_stackinfo(pTHX_ I32 stitems, I32 cxitems)
78{
79 PERL_SI *si;
80 Newx(si, 1, PERL_SI);
81 si->si_stack = newAV();
82 AvREAL_off(si->si_stack);
83 av_extend(si->si_stack, stitems > 0 ? stitems-1 : 0);
84 AvALLOC(si->si_stack)[0] = &PL_sv_undef;
85 AvFILLp(si->si_stack) = 0;
86 si->si_prev = 0;
87 si->si_next = 0;
88 si->si_cxmax = cxitems - 1;
89 si->si_cxix = -1;
90 si->si_type = PERLSI_UNDEF;
91 Newx(si->si_cxstack, cxitems, PERL_CONTEXT);
92 /* Without any kind of initialising PUSHSUBST()
93 * in pp_subst() will read uninitialised heap. */
94 Poison(si->si_cxstack, cxitems, PERL_CONTEXT);
95 return si;
96}
97
98I32
99Perl_cxinc(pTHX)
100{
101 const IV old_max = cxstack_max;
102 cxstack_max = GROW(cxstack_max);
103 Renew(cxstack, cxstack_max + 1, PERL_CONTEXT); /* XXX should fix CXINC macro */
104 /* Without any kind of initialising deep enough recursion
105 * will end up reading uninitialised PERL_CONTEXTs. */
106 Poison(cxstack + old_max + 1, cxstack_max - old_max, PERL_CONTEXT);
107 return cxstack_ix + 1;
108}
109
110void
111Perl_push_return(pTHX_ OP *retop)
112{
113 if (PL_retstack_ix == PL_retstack_max) {
114 PL_retstack_max = GROW(PL_retstack_max);
115 Renew(PL_retstack, PL_retstack_max, OP*);
116 }
117 PL_retstack[PL_retstack_ix++] = retop;
118}
119
120OP *
121Perl_pop_return(pTHX)
122{
123 if (PL_retstack_ix > 0)
124 return PL_retstack[--PL_retstack_ix];
125 else
126 return Nullop;
127}
128
129void
130Perl_push_scope(pTHX)
131{
132 if (PL_scopestack_ix == PL_scopestack_max) {
133 PL_scopestack_max = GROW(PL_scopestack_max);
134 Renew(PL_scopestack, PL_scopestack_max, I32);
135 }
136 PL_scopestack[PL_scopestack_ix++] = PL_savestack_ix;
137
138}
139
140void
141Perl_pop_scope(pTHX)
142{
143 const I32 oldsave = PL_scopestack[--PL_scopestack_ix];
144 LEAVE_SCOPE(oldsave);
145}
146
147void
148Perl_markstack_grow(pTHX)
149{
150 const I32 oldmax = PL_markstack_max - PL_markstack;
151 const I32 newmax = GROW(oldmax);
152
153 Renew(PL_markstack, newmax, I32);
154 PL_markstack_ptr = PL_markstack + oldmax;
155 PL_markstack_max = PL_markstack + newmax;
156}
157
158void
159Perl_savestack_grow(pTHX)
160{
161 PL_savestack_max = GROW(PL_savestack_max) + 4;
162 Renew(PL_savestack, PL_savestack_max, ANY);
163}
164
165void
166Perl_savestack_grow_cnt(pTHX_ I32 need)
167{
168 PL_savestack_max = PL_savestack_ix + need;
169 Renew(PL_savestack, PL_savestack_max, ANY);
170}
171
172#undef GROW
173
174void
175Perl_tmps_grow(pTHX_ I32 n)
176{
177#ifndef STRESS_REALLOC
178 if (n < 128)
179 n = (PL_tmps_max < 512) ? 128 : 512;
180#endif
181 PL_tmps_max = PL_tmps_ix + n + 1;
182 Renew(PL_tmps_stack, PL_tmps_max, SV*);
183}
184
185
186void
187Perl_free_tmps(pTHX)
188{
189 /* XXX should tmps_floor live in cxstack? */
190 const I32 myfloor = PL_tmps_floor;
191 while (PL_tmps_ix > myfloor) { /* clean up after last statement */
192 SV* const sv = PL_tmps_stack[PL_tmps_ix];
193 PL_tmps_stack[PL_tmps_ix--] = Nullsv;
194 if (sv && sv != &PL_sv_undef) {
195 SvTEMP_off(sv);
196 SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */
197 }
198 }
199}
200
201STATIC SV *
202S_save_scalar_at(pTHX_ SV **sptr)
203{
204 SV * const osv = *sptr;
205 register SV * const sv = *sptr = NEWSV(0,0);
206
207 if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
208 sv_upgrade(sv, SvTYPE(osv));
209 if (SvGMAGICAL(osv)) {
210 MAGIC* mg;
211 const bool oldtainted = PL_tainted;
212 mg_get(osv); /* note, can croak! */
213 if (PL_tainting && PL_tainted &&
214 (mg = mg_find(osv, PERL_MAGIC_taint))) {
215 SAVESPTR(mg->mg_obj);
216 mg->mg_obj = osv;
217 }
218 SvFLAGS(osv) |= (SvFLAGS(osv) &
219 (SVp_NOK|SVp_POK)) >> PRIVSHIFT;
220 PL_tainted = oldtainted;
221 }
222 SvMAGIC_set(sv, SvMAGIC(osv));
223 SvFLAGS(sv) |= SvMAGICAL(osv);
224 /* XXX SvMAGIC() is *shared* between osv and sv. This can
225 * lead to coredumps when both SVs are destroyed without one
226 * of their SvMAGIC() slots being NULLed. */
227 PL_localizing = 1;
228 SvSETMAGIC(sv);
229 PL_localizing = 0;
230 }
231 return sv;
232}
233
234SV *
235Perl_save_scalar(pTHX_ GV *gv)
236{
237 SV **sptr = &GvSV(gv);
238 SSCHECK(3);
239 SSPUSHPTR(SvREFCNT_inc(gv));
240 SSPUSHPTR(SvREFCNT_inc(*sptr));
241 SSPUSHINT(SAVEt_SV);
242 return save_scalar_at(sptr);
243}
244
245SV*
246Perl_save_svref(pTHX_ SV **sptr)
247{
248 SSCHECK(3);
249 SSPUSHPTR(sptr);
250 SSPUSHPTR(SvREFCNT_inc(*sptr));
251 SSPUSHINT(SAVEt_SVREF);
252 return save_scalar_at(sptr);
253}
254
255/* Like save_sptr(), but also SvREFCNT_dec()s the new value. Can be used to
256 * restore a global SV to its prior contents, freeing new value. */
257void
258Perl_save_generic_svref(pTHX_ SV **sptr)
259{
260 SSCHECK(3);
261 SSPUSHPTR(sptr);
262 SSPUSHPTR(SvREFCNT_inc(*sptr));
263 SSPUSHINT(SAVEt_GENERIC_SVREF);
264}
265
266/* Like save_pptr(), but also Safefree()s the new value if it is different
267 * from the old one. Can be used to restore a global char* to its prior
268 * contents, freeing new value. */
269void
270Perl_save_generic_pvref(pTHX_ char **str)
271{
272 SSCHECK(3);
273 SSPUSHPTR(str);
274 SSPUSHPTR(*str);
275 SSPUSHINT(SAVEt_GENERIC_PVREF);
276}
277
278/* Like save_generic_pvref(), but uses PerlMemShared_free() rather than Safefree().
279 * Can be used to restore a shared global char* to its prior
280 * contents, freeing new value. */
281void
282Perl_save_shared_pvref(pTHX_ char **str)
283{
284 SSCHECK(3);
285 SSPUSHPTR(str);
286 SSPUSHPTR(*str);
287 SSPUSHINT(SAVEt_SHARED_PVREF);
288}
289
290void
291Perl_save_gp(pTHX_ GV *gv, I32 empty)
292{
293 SSGROW(6);
294 SSPUSHIV((IV)SvLEN(gv));
295 SvLEN_set(gv, 0); /* forget that anything was allocated here */
296 SSPUSHIV((IV)SvCUR(gv));
297 SSPUSHPTR(SvPVX_const(gv));
298 SvPOK_off(gv);
299 SSPUSHPTR(SvREFCNT_inc(gv));
300 SSPUSHPTR(GvGP(gv));
301 SSPUSHINT(SAVEt_GP);
302
303 if (empty) {
304 register GP *gp;
305
306 Newxz(gp, 1, GP);
307
308 if (GvCVu(gv))
309 PL_sub_generation++; /* taking a method out of circulation */
310 if (GvIOp(gv) && (IoFLAGS(GvIOp(gv)) & IOf_ARGV)) {
311 gp->gp_io = newIO();
312 IoFLAGS(gp->gp_io) |= IOf_ARGV|IOf_START;
313 }
314 GvGP(gv) = gp_ref(gp);
315 GvSV(gv) = NEWSV(72,0);
316 GvLINE(gv) = CopLINE(PL_curcop);
317 /* XXX Ideally this cast would be replaced with a change to const char*
318 in the struct. */
319 GvFILE(gv) = CopFILE(PL_curcop) ? CopFILE(PL_curcop) : (char *) "";
320 GvEGV(gv) = gv;
321 }
322 else {
323 gp_ref(GvGP(gv));
324 GvINTRO_on(gv);
325 }
326}
327
328AV *
329Perl_save_ary(pTHX_ GV *gv)
330{
331 AV * const oav = GvAVn(gv);
332 AV *av;
333
334 if (!AvREAL(oav) && AvREIFY(oav))
335 av_reify(oav);
336 SSCHECK(3);
337 SSPUSHPTR(gv);
338 SSPUSHPTR(oav);
339 SSPUSHINT(SAVEt_AV);
340
341 GvAV(gv) = Null(AV*);
342 av = GvAVn(gv);
343 if (SvMAGIC(oav)) {
344 SvMAGIC_set(av, SvMAGIC(oav));
345 SvFLAGS((SV*)av) |= SvMAGICAL(oav);
346 SvMAGICAL_off(oav);
347 SvMAGIC_set(oav, NULL);
348 PL_localizing = 1;
349 SvSETMAGIC((SV*)av);
350 PL_localizing = 0;
351 }
352 return av;
353}
354
355HV *
356Perl_save_hash(pTHX_ GV *gv)
357{
358 HV *ohv, *hv;
359
360 SSCHECK(3);
361 SSPUSHPTR(gv);
362 SSPUSHPTR(ohv = GvHVn(gv));
363 SSPUSHINT(SAVEt_HV);
364
365 GvHV(gv) = Null(HV*);
366 hv = GvHVn(gv);
367 if (SvMAGIC(ohv)) {
368 SvMAGIC_set(hv, SvMAGIC(ohv));
369 SvFLAGS((SV*)hv) |= SvMAGICAL(ohv);
370 SvMAGICAL_off(ohv);
371 SvMAGIC_set(ohv, NULL);
372 PL_localizing = 1;
373 SvSETMAGIC((SV*)hv);
374 PL_localizing = 0;
375 }
376 return hv;
377}
378
379void
380Perl_save_item(pTHX_ register SV *item)
381{
382 register SV * const sv = newSVsv(item);
383
384 SSCHECK(3);
385 SSPUSHPTR(item); /* remember the pointer */
386 SSPUSHPTR(sv); /* remember the value */
387 SSPUSHINT(SAVEt_ITEM);
388}
389
390void
391Perl_save_int(pTHX_ int *intp)
392{
393 SSCHECK(3);
394 SSPUSHINT(*intp);
395 SSPUSHPTR(intp);
396 SSPUSHINT(SAVEt_INT);
397}
398
399void
400Perl_save_long(pTHX_ long int *longp)
401{
402 SSCHECK(3);
403 SSPUSHLONG(*longp);
404 SSPUSHPTR(longp);
405 SSPUSHINT(SAVEt_LONG);
406}
407
408void
409Perl_save_bool(pTHX_ bool *boolp)
410{
411 SSCHECK(3);
412 SSPUSHBOOL(*boolp);
413 SSPUSHPTR(boolp);
414 SSPUSHINT(SAVEt_BOOL);
415}
416
417void
418Perl_save_I32(pTHX_ I32 *intp)
419{
420 SSCHECK(3);
421 SSPUSHINT(*intp);
422 SSPUSHPTR(intp);
423 SSPUSHINT(SAVEt_I32);
424}
425
426void
427Perl_save_I16(pTHX_ I16 *intp)
428{
429 SSCHECK(3);
430 SSPUSHINT(*intp);
431 SSPUSHPTR(intp);
432 SSPUSHINT(SAVEt_I16);
433}
434
435void
436Perl_save_I8(pTHX_ I8 *bytep)
437{
438 SSCHECK(3);
439 SSPUSHINT(*bytep);
440 SSPUSHPTR(bytep);
441 SSPUSHINT(SAVEt_I8);
442}
443
444void
445Perl_save_iv(pTHX_ IV *ivp)
446{
447 SSCHECK(3);
448 SSPUSHIV(*ivp);
449 SSPUSHPTR(ivp);
450 SSPUSHINT(SAVEt_IV);
451}
452
453/* Cannot use save_sptr() to store a char* since the SV** cast will
454 * force word-alignment and we'll miss the pointer.
455 */
456void
457Perl_save_pptr(pTHX_ char **pptr)
458{
459 SSCHECK(3);
460 SSPUSHPTR(*pptr);
461 SSPUSHPTR(pptr);
462 SSPUSHINT(SAVEt_PPTR);
463}
464
465void
466Perl_save_vptr(pTHX_ void *ptr)
467{
468 SSCHECK(3);
469 SSPUSHPTR(*(char**)ptr);
470 SSPUSHPTR(ptr);
471 SSPUSHINT(SAVEt_VPTR);
472}
473
474void
475Perl_save_sptr(pTHX_ SV **sptr)
476{
477 SSCHECK(3);
478 SSPUSHPTR(*sptr);
479 SSPUSHPTR(sptr);
480 SSPUSHINT(SAVEt_SPTR);
481}
482
483void
484Perl_save_padsv(pTHX_ PADOFFSET off)
485{
486 SSCHECK(4);
487 ASSERT_CURPAD_ACTIVE("save_padsv");
488 SSPUSHPTR(PL_curpad[off]);
489 SSPUSHPTR(PL_comppad);
490 SSPUSHLONG((long)off);
491 SSPUSHINT(SAVEt_PADSV);
492}
493
494SV **
495Perl_save_threadsv(pTHX_ PADOFFSET i)
496{
497#ifdef USE_5005THREADS
498 SV **svp = &THREADSV(i); /* XXX Change to save by offset */
499 DEBUG_S(PerlIO_printf(Perl_debug_log, "save_threadsv %"UVuf": %p %p:%s\n",
500 (UV)i, svp, *svp, SvPEEK(*svp)));
501 save_svref(svp);
502 return svp;
503#else
504 Perl_croak(aTHX_ "panic: save_threadsv called in non-threaded perl");
505 PERL_UNUSED_ARG(i);
506 NORETURN_FUNCTION_END;
507#endif /* USE_5005THREADS */
508}
509
510void
511Perl_save_nogv(pTHX_ GV *gv)
512{
513 SSCHECK(2);
514 SSPUSHPTR(gv);
515 SSPUSHINT(SAVEt_NSTAB);
516}
517
518void
519Perl_save_hptr(pTHX_ HV **hptr)
520{
521 SSCHECK(3);
522 SSPUSHPTR(*hptr);
523 SSPUSHPTR(hptr);
524 SSPUSHINT(SAVEt_HPTR);
525}
526
527void
528Perl_save_aptr(pTHX_ AV **aptr)
529{
530 SSCHECK(3);
531 SSPUSHPTR(*aptr);
532 SSPUSHPTR(aptr);
533 SSPUSHINT(SAVEt_APTR);
534}
535
536void
537Perl_save_freesv(pTHX_ SV *sv)
538{
539 SSCHECK(2);
540 SSPUSHPTR(sv);
541 SSPUSHINT(SAVEt_FREESV);
542}
543
544void
545Perl_save_mortalizesv(pTHX_ SV *sv)
546{
547 SSCHECK(2);
548 SSPUSHPTR(sv);
549 SSPUSHINT(SAVEt_MORTALIZESV);
550}
551
552void
553Perl_save_freeop(pTHX_ OP *o)
554{
555 SSCHECK(2);
556 SSPUSHPTR(o);
557 SSPUSHINT(SAVEt_FREEOP);
558}
559
560void
561Perl_save_freepv(pTHX_ char *pv)
562{
563 SSCHECK(2);
564 SSPUSHPTR(pv);
565 SSPUSHINT(SAVEt_FREEPV);
566}
567
568void
569Perl_save_clearsv(pTHX_ SV **svp)
570{
571 ASSERT_CURPAD_ACTIVE("save_clearsv");
572 SSCHECK(2);
573 SSPUSHLONG((long)(svp-PL_curpad));
574 SSPUSHINT(SAVEt_CLEARSV);
575}
576
577void
578Perl_save_delete(pTHX_ HV *hv, char *key, I32 klen)
579{
580 SSCHECK(4);
581 SSPUSHINT(klen);
582 SSPUSHPTR(key);
583 SSPUSHPTR(SvREFCNT_inc(hv));
584 SSPUSHINT(SAVEt_DELETE);
585}
586
587void
588Perl_save_list(pTHX_ register SV **sarg, I32 maxsarg)
589{
590 register I32 i;
591
592 for (i = 1; i <= maxsarg; i++) {
593 register SV * const sv = NEWSV(0,0);
594 sv_setsv(sv,sarg[i]);
595 SSCHECK(3);
596 SSPUSHPTR(sarg[i]); /* remember the pointer */
597 SSPUSHPTR(sv); /* remember the value */
598 SSPUSHINT(SAVEt_ITEM);
599 }
600}
601
602void
603Perl_save_destructor(pTHX_ DESTRUCTORFUNC_NOCONTEXT_t f, void* p)
604{
605 SSCHECK(3);
606 SSPUSHDPTR(f);
607 SSPUSHPTR(p);
608 SSPUSHINT(SAVEt_DESTRUCTOR);
609}
610
611void
612Perl_save_destructor_x(pTHX_ DESTRUCTORFUNC_t f, void* p)
613{
614 SSCHECK(3);
615 SSPUSHDXPTR(f);
616 SSPUSHPTR(p);
617 SSPUSHINT(SAVEt_DESTRUCTOR_X);
618}
619
620void
621Perl_save_aelem(pTHX_ AV *av, I32 idx, SV **sptr)
622{
623 SV *sv;
624 SSCHECK(4);
625 SSPUSHPTR(SvREFCNT_inc(av));
626 SSPUSHINT(idx);
627 SSPUSHPTR(SvREFCNT_inc(*sptr));
628 SSPUSHINT(SAVEt_AELEM);
629 /* if it gets reified later, the restore will have the wrong refcnt */
630 if (!AvREAL(av) && AvREIFY(av))
631 (void)SvREFCNT_inc(*sptr);
632 save_scalar_at(sptr);
633 sv = *sptr;
634 /* If we're localizing a tied array element, this new sv
635 * won't actually be stored in the array - so it won't get
636 * reaped when the localize ends. Ensure it gets reaped by
637 * mortifying it instead. DAPM */
638 if (SvTIED_mg(sv, PERL_MAGIC_tiedelem))
639 sv_2mortal(sv);
640}
641
642void
643Perl_save_helem(pTHX_ HV *hv, SV *key, SV **sptr)
644{
645 SV *sv;
646 SSCHECK(4);
647 SSPUSHPTR(SvREFCNT_inc(hv));
648 SSPUSHPTR(SvREFCNT_inc(key));
649 SSPUSHPTR(SvREFCNT_inc(*sptr));
650 SSPUSHINT(SAVEt_HELEM);
651 save_scalar_at(sptr);
652 sv = *sptr;
653 /* If we're localizing a tied hash element, this new sv
654 * won't actually be stored in the hash - so it won't get
655 * reaped when the localize ends. Ensure it gets reaped by
656 * mortifying it instead. DAPM */
657 if (SvTIED_mg(sv, PERL_MAGIC_tiedelem))
658 sv_2mortal(sv);
659}
660
661void
662Perl_save_op(pTHX)
663{
664 SSCHECK(2);
665 SSPUSHPTR(PL_op);
666 SSPUSHINT(SAVEt_OP);
667}
668
669I32
670Perl_save_alloc(pTHX_ I32 size, I32 pad)
671{
672 register const I32 start = pad + ((char*)&PL_savestack[PL_savestack_ix]
673 - (char*)PL_savestack);
674 register const I32 elems = 1 + ((size + pad - 1) / sizeof(*PL_savestack));
675
676 /* SSCHECK may not be good enough */
677 while (PL_savestack_ix + elems + 2 > PL_savestack_max)
678 savestack_grow();
679
680 PL_savestack_ix += elems;
681 SSPUSHINT(elems);
682 SSPUSHINT(SAVEt_ALLOC);
683 return start;
684}
685
686void
687Perl_leave_scope(pTHX_ I32 base)
688{
689 register SV *sv;
690 register SV *value;
691 register GV *gv;
692 register AV *av;
693 register HV *hv;
694 register void* ptr;
695 register char* str;
696 I32 i;
697
698 if (base < -1)
699 Perl_croak(aTHX_ "panic: corrupt saved stack index");
700 while (PL_savestack_ix > base) {
701 switch (SSPOPINT) {
702 case SAVEt_ITEM: /* normal string */
703 value = (SV*)SSPOPPTR;
704 sv = (SV*)SSPOPPTR;
705 sv_replace(sv,value);
706 PL_localizing = 2;
707 SvSETMAGIC(sv);
708 PL_localizing = 0;
709 break;
710 case SAVEt_SV: /* scalar reference */
711 value = (SV*)SSPOPPTR;
712 gv = (GV*)SSPOPPTR;
713 ptr = &GvSV(gv);
714 av = (AV*)gv; /* what to refcnt_dec */
715 goto restore_sv;
716 case SAVEt_GENERIC_PVREF: /* generic pv */
717 str = (char*)SSPOPPTR;
718 ptr = SSPOPPTR;
719 if (*(char**)ptr != str) {
720 Safefree(*(char**)ptr);
721 *(char**)ptr = str;
722 }
723 break;
724 case SAVEt_SHARED_PVREF: /* shared pv */
725 str = (char*)SSPOPPTR;
726 ptr = SSPOPPTR;
727 if (*(char**)ptr != str) {
728#ifdef NETWARE
729 PerlMem_free(*(char**)ptr);
730#else
731 PerlMemShared_free(*(char**)ptr);
732#endif
733 *(char**)ptr = str;
734 }
735 break;
736 case SAVEt_GENERIC_SVREF: /* generic sv */
737 value = (SV*)SSPOPPTR;
738 ptr = SSPOPPTR;
739 sv = *(SV**)ptr;
740 *(SV**)ptr = value;
741 SvREFCNT_dec(sv);
742 SvREFCNT_dec(value);
743 break;
744 case SAVEt_SVREF: /* scalar reference */
745 value = (SV*)SSPOPPTR;
746 ptr = SSPOPPTR;
747 av = Nullav; /* what to refcnt_dec */
748 restore_sv:
749 sv = *(SV**)ptr;
750 DEBUG_S(PerlIO_printf(Perl_debug_log,
751 "restore svref: %p %p:%s -> %p:%s\n",
752 ptr, sv, SvPEEK(sv), value, SvPEEK(value)));
753 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
754 SvTYPE(sv) != SVt_PVGV)
755 {
756 (void)SvUPGRADE(value, SvTYPE(sv));
757 SvMAGIC_set(value, SvMAGIC(sv));
758 SvFLAGS(value) |= SvMAGICAL(sv);
759 SvMAGICAL_off(sv);
760 SvMAGIC_set(sv, 0);
761 }
762 /* XXX This branch is pretty bogus. This code irretrievably
763 * clears(!) the magic on the SV (either to avoid further
764 * croaking that might ensue when the SvSETMAGIC() below is
765 * called, or to avoid two different SVs pointing at the same
766 * SvMAGIC()). This needs a total rethink. --GSAR */
767 else if (SvTYPE(value) >= SVt_PVMG && SvMAGIC(value) &&
768 SvTYPE(value) != SVt_PVGV)
769 {
770 SvFLAGS(value) |= (SvFLAGS(value) &
771 (SVp_NOK|SVp_POK)) >> PRIVSHIFT;
772 SvMAGICAL_off(value);
773 /* XXX this is a leak when we get here because the
774 * mg_get() in save_scalar_at() croaked */
775 SvMAGIC_set(value, NULL);
776 }
777 *(SV**)ptr = value;
778 SvREFCNT_dec(sv);
779 PL_localizing = 2;
780 SvSETMAGIC(value);
781 PL_localizing = 0;
782 SvREFCNT_dec(value);
783 if (av) /* actually an av, hv or gv */
784 SvREFCNT_dec(av);
785 break;
786 case SAVEt_AV: /* array reference */
787 av = (AV*)SSPOPPTR;
788 gv = (GV*)SSPOPPTR;
789 if (GvAV(gv)) {
790 AV * const goner = GvAV(gv);
791 SvMAGIC_set(av, SvMAGIC(goner));
792 SvFLAGS((SV*)av) |= SvMAGICAL(goner);
793 SvMAGICAL_off(goner);
794 SvMAGIC_set(goner, NULL);
795 SvREFCNT_dec(goner);
796 }
797 GvAV(gv) = av;
798 if (SvMAGICAL(av)) {
799 PL_localizing = 2;
800 SvSETMAGIC((SV*)av);
801 PL_localizing = 0;
802 }
803 break;
804 case SAVEt_HV: /* hash reference */
805 hv = (HV*)SSPOPPTR;
806 gv = (GV*)SSPOPPTR;
807 if (GvHV(gv)) {
808 HV * const goner = GvHV(gv);
809 SvMAGIC_set(hv, SvMAGIC(goner));
810 SvFLAGS(hv) |= SvMAGICAL(goner);
811 SvMAGICAL_off(goner);
812 SvMAGIC_set(goner, NULL);
813 SvREFCNT_dec(goner);
814 }
815 GvHV(gv) = hv;
816 if (SvMAGICAL(hv)) {
817 PL_localizing = 2;
818 SvSETMAGIC((SV*)hv);
819 PL_localizing = 0;
820 }
821 break;
822 case SAVEt_INT: /* int reference */
823 ptr = SSPOPPTR;
824 *(int*)ptr = (int)SSPOPINT;
825 break;
826 case SAVEt_LONG: /* long reference */
827 ptr = SSPOPPTR;
828 *(long*)ptr = (long)SSPOPLONG;
829 break;
830 case SAVEt_BOOL: /* bool reference */
831 ptr = SSPOPPTR;
832 *(bool*)ptr = (bool)SSPOPBOOL;
833 break;
834 case SAVEt_I32: /* I32 reference */
835 ptr = SSPOPPTR;
836 *(I32*)ptr = (I32)SSPOPINT;
837 break;
838 case SAVEt_I16: /* I16 reference */
839 ptr = SSPOPPTR;
840 *(I16*)ptr = (I16)SSPOPINT;
841 break;
842 case SAVEt_I8: /* I8 reference */
843 ptr = SSPOPPTR;
844 *(I8*)ptr = (I8)SSPOPINT;
845 break;
846 case SAVEt_IV: /* IV reference */
847 ptr = SSPOPPTR;
848 *(IV*)ptr = (IV)SSPOPIV;
849 break;
850 case SAVEt_SPTR: /* SV* reference */
851 ptr = SSPOPPTR;
852 *(SV**)ptr = (SV*)SSPOPPTR;
853 break;
854 case SAVEt_VPTR: /* random* reference */
855 case SAVEt_PPTR: /* char* reference */
856 ptr = SSPOPPTR;
857 *(char**)ptr = (char*)SSPOPPTR;
858 break;
859 case SAVEt_HPTR: /* HV* reference */
860 ptr = SSPOPPTR;
861 *(HV**)ptr = (HV*)SSPOPPTR;
862 break;
863 case SAVEt_APTR: /* AV* reference */
864 ptr = SSPOPPTR;
865 *(AV**)ptr = (AV*)SSPOPPTR;
866 break;
867 case SAVEt_NSTAB:
868 gv = (GV*)SSPOPPTR;
869 (void)sv_clear((SV*)gv);
870 break;
871 case SAVEt_GP: /* scalar reference */
872 ptr = SSPOPPTR;
873 gv = (GV*)SSPOPPTR;
874 if (SvPVX_const(gv) && SvLEN(gv) > 0) {
875 Safefree(SvPVX_mutable(gv));
876 }
877 SvPV_set(gv, (char *)SSPOPPTR);
878 SvCUR_set(gv, (STRLEN)SSPOPIV);
879 SvLEN_set(gv, (STRLEN)SSPOPIV);
880 gp_free(gv);
881 GvGP(gv) = (GP*)ptr;
882 if (GvCVu(gv))
883 PL_sub_generation++; /* putting a method back into circulation */
884 SvREFCNT_dec(gv);
885 break;
886 case SAVEt_FREESV:
887 ptr = SSPOPPTR;
888 SvREFCNT_dec((SV*)ptr);
889 break;
890 case SAVEt_MORTALIZESV:
891 ptr = SSPOPPTR;
892 sv_2mortal((SV*)ptr);
893 break;
894 case SAVEt_FREEOP:
895 ptr = SSPOPPTR;
896 ASSERT_CURPAD_LEGAL("SAVEt_FREEOP"); /* XXX DAPM tmp */
897 op_free((OP*)ptr);
898 break;
899 case SAVEt_FREEPV:
900 ptr = SSPOPPTR;
901 Safefree(ptr);
902 break;
903 case SAVEt_CLEARSV:
904 ptr = (void*)&PL_curpad[SSPOPLONG];
905 sv = *(SV**)ptr;
906
907 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
908 "Pad 0x%"UVxf"[0x%"UVxf"] clearsv: %ld sv=0x%"UVxf"<%"IVdf"> %s\n",
909 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
910 (long)((SV **)ptr-PL_curpad), PTR2UV(sv), (IV)SvREFCNT(sv),
911 (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) ? "clear" : "abandon"
912 ));
913
914 /* Can clear pad variable in place? */
915 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
916 /*
917 * if a my variable that was made readonly is going out of
918 * scope, we want to remove the readonlyness so that it can
919 * go out of scope quietly
920 */
921 if (SvPADMY(sv) && !SvFAKE(sv))
922 SvREADONLY_off(sv);
923
924 if (SvTHINKFIRST(sv))
925 sv_force_normal_flags(sv, SV_IMMEDIATE_UNREF);
926 if (SvMAGICAL(sv))
927 mg_free(sv);
928
929 switch (SvTYPE(sv)) {
930 case SVt_NULL:
931 break;
932 case SVt_PVAV:
933 av_clear((AV*)sv);
934 /* Need to detach $#array from @array that has just gone
935 out of scope. Otherwise the first $#array controls the
936 size of the array "newly" created the next time this
937 scope is entered.
938 */
939 if (AvARYLEN(sv)) {
940 MAGIC *mg = mg_find (AvARYLEN(sv), PERL_MAGIC_arylen);
941
942 if (mg) {
943 mg->mg_obj = 0;
944 }
945
946 SvREFCNT_dec(AvARYLEN(sv));
947 AvARYLEN(sv) = 0;
948 }
949 break;
950 case SVt_PVHV:
951 hv_clear((HV*)sv);
952 break;
953 case SVt_PVCV:
954 Perl_croak(aTHX_ "panic: leave_scope pad code");
955 default:
956 SvOK_off(sv);
957 break;
958 }
959 }
960 else { /* Someone has a claim on this, so abandon it. */
961 const U32 padflags
962 = SvFLAGS(sv) & (SVs_PADBUSY|SVs_PADMY|SVs_PADTMP);
963 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
964 case SVt_PVAV: *(SV**)ptr = (SV*)newAV(); break;
965 case SVt_PVHV: *(SV**)ptr = (SV*)newHV(); break;
966 default: *(SV**)ptr = NEWSV(0,0); break;
967 }
968 SvREFCNT_dec(sv); /* Cast current value to the winds. */
969 SvFLAGS(*(SV**)ptr) |= padflags; /* preserve pad nature */
970 }
971 break;
972 case SAVEt_DELETE:
973 ptr = SSPOPPTR;
974 hv = (HV*)ptr;
975 ptr = SSPOPPTR;
976 (void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
977 SvREFCNT_dec(hv);
978 Safefree(ptr);
979 break;
980 case SAVEt_DESTRUCTOR:
981 ptr = SSPOPPTR;
982 (*SSPOPDPTR)(ptr);
983 break;
984 case SAVEt_DESTRUCTOR_X:
985 ptr = SSPOPPTR;
986 (*SSPOPDXPTR)(aTHX_ ptr);
987 break;
988 case SAVEt_REGCONTEXT:
989 case SAVEt_ALLOC:
990 i = SSPOPINT;
991 PL_savestack_ix -= i; /* regexp must have croaked */
992 break;
993 case SAVEt_STACK_POS: /* Position on Perl stack */
994 i = SSPOPINT;
995 PL_stack_sp = PL_stack_base + i;
996 break;
997 case SAVEt_AELEM: /* array element */
998 value = (SV*)SSPOPPTR;
999 i = SSPOPINT;
1000 av = (AV*)SSPOPPTR;
1001 if (!AvREAL(av) && AvREIFY(av)) /* undo reify guard */
1002 SvREFCNT_dec(value);
1003 ptr = av_fetch(av,i,1);
1004 if (ptr) {
1005 sv = *(SV**)ptr;
1006 if (sv && sv != &PL_sv_undef) {
1007 if (SvTIED_mg((SV*)av, PERL_MAGIC_tied))
1008 (void)SvREFCNT_inc(sv);
1009 goto restore_sv;
1010 }
1011 }
1012 SvREFCNT_dec(av);
1013 SvREFCNT_dec(value);
1014 break;
1015 case SAVEt_HELEM: /* hash element */
1016 value = (SV*)SSPOPPTR;
1017 sv = (SV*)SSPOPPTR;
1018 hv = (HV*)SSPOPPTR;
1019 ptr = hv_fetch_ent(hv, sv, 1, 0);
1020 if (ptr) {
1021 const SV * const oval = HeVAL((HE*)ptr);
1022 if (oval && oval != &PL_sv_undef) {
1023 ptr = &HeVAL((HE*)ptr);
1024 if (SvTIED_mg((SV*)hv, PERL_MAGIC_tied))
1025 (void)SvREFCNT_inc(*(SV**)ptr);
1026 SvREFCNT_dec(sv);
1027 av = (AV*)hv; /* what to refcnt_dec */
1028 goto restore_sv;
1029 }
1030 }
1031 SvREFCNT_dec(hv);
1032 SvREFCNT_dec(sv);
1033 SvREFCNT_dec(value);
1034 break;
1035 case SAVEt_OP:
1036 PL_op = (OP*)SSPOPPTR;
1037 break;
1038 case SAVEt_HINTS:
1039 if ((PL_hints & HINT_LOCALIZE_HH) && GvHV(PL_hintgv)) {
1040 SvREFCNT_dec((SV*)GvHV(PL_hintgv));
1041 GvHV(PL_hintgv) = NULL;
1042 }
1043 *(I32*)&PL_hints = (I32)SSPOPINT;
1044 if (PL_hints & HINT_LOCALIZE_HH) {
1045 SvREFCNT_dec((SV*)GvHV(PL_hintgv));
1046 GvHV(PL_hintgv) = (HV*)SSPOPPTR;
1047 }
1048
1049 break;
1050 case SAVEt_COMPPAD:
1051 PL_comppad = (PAD*)SSPOPPTR;
1052 if (PL_comppad)
1053 PL_curpad = AvARRAY(PL_comppad);
1054 else
1055 PL_curpad = Null(SV**);
1056 break;
1057 case SAVEt_PADSV:
1058 {
1059 const PADOFFSET off = (PADOFFSET)SSPOPLONG;
1060 ptr = SSPOPPTR;
1061 if (ptr)
1062 AvARRAY((PAD*)ptr)[off] = (SV*)SSPOPPTR;
1063 }
1064 break;
1065 case SAVEt_SAVESWITCHSTACK:
1066 {
1067 dSP;
1068 AV* t = (AV*)SSPOPPTR;
1069 AV* f = (AV*)SSPOPPTR;
1070 SWITCHSTACK(t,f);
1071 PL_curstackinfo->si_stack = f;
1072 }
1073 break;
1074 default:
1075 Perl_croak(aTHX_ "panic: leave_scope inconsistency");
1076 }
1077 }
1078}
1079
1080void
1081Perl_cx_dump(pTHX_ PERL_CONTEXT *cx)
1082{
1083#ifdef DEBUGGING
1084 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]);
1085 if (CxTYPE(cx) != CXt_SUBST) {
1086 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
1087 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%"UVxf"\n",
1088 PTR2UV(cx->blk_oldcop));
1089 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
1090 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
1091 PerlIO_printf(Perl_debug_log, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
1092 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%"UVxf"\n",
1093 PTR2UV(cx->blk_oldpm));
1094 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
1095 }
1096 switch (CxTYPE(cx)) {
1097 case CXt_NULL:
1098 case CXt_BLOCK:
1099 break;
1100 case CXt_FORMAT:
1101 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%"UVxf"\n",
1102 PTR2UV(cx->blk_sub.cv));
1103 PerlIO_printf(Perl_debug_log, "BLK_SUB.GV = 0x%"UVxf"\n",
1104 PTR2UV(cx->blk_sub.gv));
1105 PerlIO_printf(Perl_debug_log, "BLK_SUB.DFOUTGV = 0x%"UVxf"\n",
1106 PTR2UV(cx->blk_sub.dfoutgv));
1107 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
1108 (int)cx->blk_sub.hasargs);
1109 break;
1110 case CXt_SUB:
1111 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%"UVxf"\n",
1112 PTR2UV(cx->blk_sub.cv));
1113 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
1114 (long)cx->blk_sub.olddepth);
1115 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
1116 (int)cx->blk_sub.hasargs);
1117 PerlIO_printf(Perl_debug_log, "BLK_SUB.LVAL = %d\n",
1118 (int)cx->blk_sub.lval);
1119 break;
1120 case CXt_EVAL:
1121 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
1122 (long)cx->blk_eval.old_in_eval);
1123 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
1124 PL_op_name[cx->blk_eval.old_op_type],
1125 PL_op_desc[cx->blk_eval.old_op_type]);
1126 if (cx->blk_eval.old_namesv)
1127 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
1128 SvPVX_const(cx->blk_eval.old_namesv));
1129 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%"UVxf"\n",
1130 PTR2UV(cx->blk_eval.old_eval_root));
1131 break;
1132
1133 case CXt_LOOP:
1134 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n",
1135 cx->blk_loop.label);
1136 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
1137 (long)cx->blk_loop.resetsp);
1138 PerlIO_printf(Perl_debug_log, "BLK_LOOP.REDO_OP = 0x%"UVxf"\n",
1139 PTR2UV(cx->blk_loop.redo_op));
1140 PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%"UVxf"\n",
1141 PTR2UV(cx->blk_loop.next_op));
1142 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LAST_OP = 0x%"UVxf"\n",
1143 PTR2UV(cx->blk_loop.last_op));
1144 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
1145 (long)cx->blk_loop.iterix);
1146 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%"UVxf"\n",
1147 PTR2UV(cx->blk_loop.iterary));
1148 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%"UVxf"\n",
1149 PTR2UV(CxITERVAR(cx)));
1150 if (CxITERVAR(cx))
1151 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%"UVxf"\n",
1152 PTR2UV(cx->blk_loop.itersave));
1153 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERLVAL = 0x%"UVxf"\n",
1154 PTR2UV(cx->blk_loop.iterlval));
1155 break;
1156
1157 case CXt_SUBST:
1158 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
1159 (long)cx->sb_iters);
1160 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
1161 (long)cx->sb_maxiters);
1162 PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n",
1163 (long)cx->sb_rflags);
1164 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
1165 (long)cx->sb_once);
1166 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
1167 cx->sb_orig);
1168 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%"UVxf"\n",
1169 PTR2UV(cx->sb_dstr));
1170 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%"UVxf"\n",
1171 PTR2UV(cx->sb_targ));
1172 PerlIO_printf(Perl_debug_log, "SB_S = 0x%"UVxf"\n",
1173 PTR2UV(cx->sb_s));
1174 PerlIO_printf(Perl_debug_log, "SB_M = 0x%"UVxf"\n",
1175 PTR2UV(cx->sb_m));
1176 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%"UVxf"\n",
1177 PTR2UV(cx->sb_strend));
1178 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%"UVxf"\n",
1179 PTR2UV(cx->sb_rxres));
1180 break;
1181 }
1182#endif /* DEBUGGING */
1183}
1184
1185/*
1186 * Local variables:
1187 * c-indentation-style: bsd
1188 * c-basic-offset: 4
1189 * indent-tabs-mode: t
1190 * End:
1191 *
1192 * ex: set ts=8 sts=4 sw=4 noet:
1193 */
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