3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
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.
12 * For the fashion of Minas Tirith was such that it was built on seven
15 * [p.751 of _The Lord of the Rings_, V/i: "Minas Tirith"]
18 /* This file contains functions to manipulate several of Perl's stacks;
19 * in particular it contains code to push various types of things onto
20 * the savestack, then to pop them off and perform the correct restorative
21 * action for each one. This corresponds to the cleanup Perl does at
26 #define PERL_IN_SCOPE_C
30 Perl_stack_grow(pTHX_ SV **sp, SV **p, int n)
34 PERL_ARGS_ASSERT_STACK_GROW;
37 #ifndef STRESS_REALLOC
38 av_extend(PL_curstack, (p - PL_stack_base) + (n) + 128);
40 av_extend(PL_curstack, (p - PL_stack_base) + (n) + 1);
45 #ifndef STRESS_REALLOC
46 #define GROW(old) ((old) * 3 / 2)
48 #define GROW(old) ((old) + 1)
52 Perl_new_stackinfo(pTHX_ I32 stitems, I32 cxitems)
57 si->si_stack = newAV();
58 AvREAL_off(si->si_stack);
59 av_extend(si->si_stack, stitems > 0 ? stitems-1 : 0);
60 AvALLOC(si->si_stack)[0] = &PL_sv_undef;
61 AvFILLp(si->si_stack) = 0;
64 si->si_cxmax = cxitems - 1;
66 si->si_type = PERLSI_UNDEF;
67 Newx(si->si_cxstack, cxitems, PERL_CONTEXT);
68 /* Without any kind of initialising PUSHSUBST()
69 * in pp_subst() will read uninitialised heap. */
70 PoisonNew(si->si_cxstack, cxitems, PERL_CONTEXT);
78 const IV old_max = cxstack_max;
79 cxstack_max = GROW(cxstack_max);
80 Renew(cxstack, cxstack_max + 1, PERL_CONTEXT); /* XXX should fix CXINC macro */
81 /* Without any kind of initialising deep enough recursion
82 * will end up reading uninitialised PERL_CONTEXTs. */
83 PoisonNew(cxstack + old_max + 1, cxstack_max - old_max, PERL_CONTEXT);
84 return cxstack_ix + 1;
91 if (PL_scopestack_ix == PL_scopestack_max) {
92 PL_scopestack_max = GROW(PL_scopestack_max);
93 Renew(PL_scopestack, PL_scopestack_max, I32);
95 Renew(PL_scopestack_name, PL_scopestack_max, const char*);
99 PL_scopestack_name[PL_scopestack_ix] = "unknown";
101 PL_scopestack[PL_scopestack_ix++] = PL_savestack_ix;
109 const I32 oldsave = PL_scopestack[--PL_scopestack_ix];
110 LEAVE_SCOPE(oldsave);
114 Perl_markstack_grow(pTHX)
117 const I32 oldmax = PL_markstack_max - PL_markstack;
118 const I32 newmax = GROW(oldmax);
120 Renew(PL_markstack, newmax, I32);
121 PL_markstack_ptr = PL_markstack + oldmax;
122 PL_markstack_max = PL_markstack + newmax;
126 Perl_savestack_grow(pTHX)
129 PL_savestack_max = GROW(PL_savestack_max) + 4;
130 Renew(PL_savestack, PL_savestack_max, ANY);
134 Perl_savestack_grow_cnt(pTHX_ I32 need)
137 PL_savestack_max = PL_savestack_ix + need;
138 Renew(PL_savestack, PL_savestack_max, ANY);
144 Perl_tmps_grow(pTHX_ I32 n)
147 #ifndef STRESS_REALLOC
149 n = (PL_tmps_max < 512) ? 128 : 512;
151 PL_tmps_max = PL_tmps_ix + n + 1;
152 Renew(PL_tmps_stack, PL_tmps_max, SV*);
160 /* XXX should tmps_floor live in cxstack? */
161 const I32 myfloor = PL_tmps_floor;
162 while (PL_tmps_ix > myfloor) { /* clean up after last statement */
163 SV* const sv = PL_tmps_stack[PL_tmps_ix];
164 PL_tmps_stack[PL_tmps_ix--] = NULL;
165 if (sv && sv != &PL_sv_undef) {
167 SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */
173 S_save_scalar_at(pTHX_ SV **sptr, const U32 flags)
179 PERL_ARGS_ASSERT_SAVE_SCALAR_AT;
182 sv = (flags & SAVEf_KEEPOLDELEM) ? osv : (*sptr = newSV(0));
184 if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
185 if (SvGMAGICAL(osv)) {
186 const bool oldtainted = PL_tainted;
187 SvFLAGS(osv) |= (SvFLAGS(osv) &
188 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
189 PL_tainted = oldtainted;
191 if (!(flags & SAVEf_KEEPOLDELEM))
192 mg_localize(osv, sv, (flags & SAVEf_SETMAGIC) != 0);
199 Perl_save_pushptrptr(pTHX_ void *const ptr1, void *const ptr2, const int type)
209 Perl_save_scalar(pTHX_ GV *gv)
212 SV ** const sptr = &GvSVn(gv);
214 PERL_ARGS_ASSERT_SAVE_SCALAR;
219 save_pushptrptr(SvREFCNT_inc_simple(gv), SvREFCNT_inc(*sptr), SAVEt_SV);
220 return save_scalar_at(sptr, SAVEf_SETMAGIC); /* XXX - FIXME - see #60360 */
223 /* Like save_sptr(), but also SvREFCNT_dec()s the new value. Can be used to
224 * restore a global SV to its prior contents, freeing new value. */
226 Perl_save_generic_svref(pTHX_ SV **sptr)
230 PERL_ARGS_ASSERT_SAVE_GENERIC_SVREF;
232 save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_GENERIC_SVREF);
235 /* Like save_pptr(), but also Safefree()s the new value if it is different
236 * from the old one. Can be used to restore a global char* to its prior
237 * contents, freeing new value. */
239 Perl_save_generic_pvref(pTHX_ char **str)
243 PERL_ARGS_ASSERT_SAVE_GENERIC_PVREF;
245 save_pushptrptr(*str, str, SAVEt_GENERIC_PVREF);
248 /* Like save_generic_pvref(), but uses PerlMemShared_free() rather than Safefree().
249 * Can be used to restore a shared global char* to its prior
250 * contents, freeing new value. */
252 Perl_save_shared_pvref(pTHX_ char **str)
256 PERL_ARGS_ASSERT_SAVE_SHARED_PVREF;
258 save_pushptrptr(str, *str, SAVEt_SHARED_PVREF);
261 /* set the SvFLAGS specified by mask to the values in val */
264 Perl_save_set_svflags(pTHX_ SV* sv, U32 mask, U32 val)
268 PERL_ARGS_ASSERT_SAVE_SET_SVFLAGS;
274 SSPUSHUV(SAVEt_SET_SVFLAGS);
278 Perl_save_gp(pTHX_ GV *gv, I32 empty)
282 PERL_ARGS_ASSERT_SAVE_GP;
285 SSPUSHINT(SvFAKE(gv));
287 SSPUSHPTR(SvREFCNT_inc(gv));
290 /* Don't let the localized GV coerce into non-glob, otherwise we would
291 * not be able to restore GP upon leave from context if that happened */
295 GP *gp = Perl_newGP(aTHX_ gv);
298 mro_method_changed_in(GvSTASH(gv)); /* taking a method out of circulation ("local")*/
299 if (GvIOp(gv) && (IoFLAGS(GvIOp(gv)) & IOf_ARGV)) {
301 IoFLAGS(gp->gp_io) |= IOf_ARGV|IOf_START;
303 #ifdef PERL_DONT_CREATE_GVSV
304 if (gv == PL_errgv) {
305 /* We could scatter this logic everywhere by changing the
306 definition of ERRSV from GvSV() to GvSVn(), but it seems more
307 efficient to do this check once here. */
308 gp->gp_sv = newSV(0);
320 Perl_save_ary(pTHX_ GV *gv)
323 AV * const oav = GvAVn(gv);
326 PERL_ARGS_ASSERT_SAVE_ARY;
328 if (!AvREAL(oav) && AvREIFY(oav))
330 save_pushptrptr(gv, oav, SAVEt_AV);
335 mg_localize(MUTABLE_SV(oav), MUTABLE_SV(av), TRUE);
340 Perl_save_hash(pTHX_ GV *gv)
345 PERL_ARGS_ASSERT_SAVE_HASH;
347 save_pushptrptr(gv, (ohv = GvHVn(gv)), SAVEt_HV);
352 mg_localize(MUTABLE_SV(ohv), MUTABLE_SV(hv), TRUE);
357 Perl_save_item(pTHX_ register SV *item)
360 register SV * const sv = newSVsv(item);
362 PERL_ARGS_ASSERT_SAVE_ITEM;
364 save_pushptrptr(item, /* remember the pointer */
365 sv, /* remember the value */
370 Perl_save_bool(pTHX_ bool *boolp)
374 PERL_ARGS_ASSERT_SAVE_BOOL;
378 SSPUSHUV(SAVEt_BOOL | (*boolp << 8));
382 Perl_save_pushi32ptr(pTHX_ const I32 i, void *const ptr, const int type)
392 Perl_save_int(pTHX_ int *intp)
395 const UV shifted = (UV)*intp << SAVE_TIGHT_SHIFT;
397 PERL_ARGS_ASSERT_SAVE_INT;
399 if ((int)(shifted >> SAVE_TIGHT_SHIFT) == *intp) {
402 SSPUSHUV(SAVEt_INT_SMALL | shifted);
404 save_pushi32ptr(*intp, intp, SAVEt_INT);
408 Perl_save_I8(pTHX_ I8 *bytep)
412 PERL_ARGS_ASSERT_SAVE_I8;
416 SSPUSHUV(SAVEt_I8 | ((UV)*bytep << 8));
420 Perl_save_I16(pTHX_ I16 *intp)
424 PERL_ARGS_ASSERT_SAVE_I16;
428 SSPUSHUV(SAVEt_I16 | ((UV)*intp << 8));
432 Perl_save_I32(pTHX_ I32 *intp)
435 const UV shifted = (UV)*intp << SAVE_TIGHT_SHIFT;
437 PERL_ARGS_ASSERT_SAVE_I32;
439 if ((I32)(shifted >> SAVE_TIGHT_SHIFT) == *intp) {
442 SSPUSHUV(SAVEt_I32_SMALL | shifted);
444 save_pushi32ptr(*intp, intp, SAVEt_I32);
447 /* Cannot use save_sptr() to store a char* since the SV** cast will
448 * force word-alignment and we'll miss the pointer.
451 Perl_save_pptr(pTHX_ char **pptr)
455 PERL_ARGS_ASSERT_SAVE_PPTR;
457 save_pushptrptr(*pptr, pptr, SAVEt_PPTR);
461 Perl_save_vptr(pTHX_ void *ptr)
465 PERL_ARGS_ASSERT_SAVE_VPTR;
467 save_pushptrptr(*(char**)ptr, ptr, SAVEt_VPTR);
471 Perl_save_sptr(pTHX_ SV **sptr)
475 PERL_ARGS_ASSERT_SAVE_SPTR;
477 save_pushptrptr(*sptr, sptr, SAVEt_SPTR);
481 Perl_save_padsv_and_mortalize(pTHX_ PADOFFSET off)
485 ASSERT_CURPAD_ACTIVE("save_padsv");
486 SSPUSHPTR(SvREFCNT_inc_simple_NN(PL_curpad[off]));
487 SSPUSHPTR(PL_comppad);
488 SSPUSHLONG((long)off);
489 SSPUSHUV(SAVEt_PADSV_AND_MORTALIZE);
493 Perl_save_hptr(pTHX_ HV **hptr)
497 PERL_ARGS_ASSERT_SAVE_HPTR;
499 save_pushptrptr(*hptr, hptr, SAVEt_HPTR);
503 Perl_save_aptr(pTHX_ AV **aptr)
507 PERL_ARGS_ASSERT_SAVE_APTR;
509 save_pushptrptr(*aptr, aptr, SAVEt_APTR);
513 Perl_save_pushptr(pTHX_ void *const ptr, const int type)
522 Perl_save_clearsv(pTHX_ SV **svp)
525 const UV offset = svp - PL_curpad;
526 const UV offset_shifted = offset << SAVE_TIGHT_SHIFT;
528 PERL_ARGS_ASSERT_SAVE_CLEARSV;
530 ASSERT_CURPAD_ACTIVE("save_clearsv");
531 if ((offset_shifted >> SAVE_TIGHT_SHIFT) != offset)
532 Perl_croak(aTHX_ "panic: pad offset %"UVuf" out of range (%p-%p)",
533 offset, svp, PL_curpad);
536 SSPUSHUV(offset_shifted | SAVEt_CLEARSV);
537 SvPADSTALE_off(*svp); /* mark lexical as active */
541 Perl_save_delete(pTHX_ HV *hv, char *key, I32 klen)
545 PERL_ARGS_ASSERT_SAVE_DELETE;
547 save_pushptri32ptr(key, klen, SvREFCNT_inc_simple(hv), SAVEt_DELETE);
551 Perl_save_hdelete(pTHX_ HV *hv, SV *keysv)
557 PERL_ARGS_ASSERT_SAVE_HDELETE;
559 key = SvPV_const(keysv, len);
560 klen = SvUTF8(keysv) ? -(I32)len : (I32)len;
561 SvREFCNT_inc_simple_void_NN(hv);
562 save_pushptri32ptr(savepvn(key, len), klen, hv, SAVEt_DELETE);
566 Perl_save_adelete(pTHX_ AV *av, I32 key)
570 PERL_ARGS_ASSERT_SAVE_ADELETE;
572 SvREFCNT_inc_void(av);
573 save_pushi32ptr(key, av, SAVEt_ADELETE);
577 Perl_save_destructor(pTHX_ DESTRUCTORFUNC_NOCONTEXT_t f, void* p)
581 PERL_ARGS_ASSERT_SAVE_DESTRUCTOR;
586 SSPUSHUV(SAVEt_DESTRUCTOR);
590 Perl_save_destructor_x(pTHX_ DESTRUCTORFUNC_t f, void* p)
596 SSPUSHUV(SAVEt_DESTRUCTOR_X);
600 Perl_save_hints(pTHX)
603 if (PL_compiling.cop_hints_hash) {
605 PL_compiling.cop_hints_hash->refcounted_he_refcnt++;
608 if (PL_hints & HINT_LOCALIZE_HH) {
609 save_pushptri32ptr(GvHV(PL_hintgv), PL_hints,
610 PL_compiling.cop_hints_hash, SAVEt_HINTS);
611 GvHV(PL_hintgv) = Perl_hv_copy_hints_hv(aTHX_ GvHV(PL_hintgv));
613 save_pushi32ptr(PL_hints, PL_compiling.cop_hints_hash, SAVEt_HINTS);
618 S_save_pushptri32ptr(pTHX_ void *const ptr1, const I32 i, void *const ptr2,
629 Perl_save_aelem_flags(pTHX_ AV *av, I32 idx, SV **sptr, const U32 flags)
634 PERL_ARGS_ASSERT_SAVE_AELEM_FLAGS;
637 save_pushptri32ptr(SvREFCNT_inc_simple(av), idx, SvREFCNT_inc(*sptr),
639 /* if it gets reified later, the restore will have the wrong refcnt */
640 if (!AvREAL(av) && AvREIFY(av))
641 SvREFCNT_inc_void(*sptr);
642 save_scalar_at(sptr, flags); /* XXX - FIXME - see #60360 */
643 if (flags & SAVEf_KEEPOLDELEM)
646 /* If we're localizing a tied array element, this new sv
647 * won't actually be stored in the array - 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((const SV *)av, PERL_MAGIC_tied))
655 Perl_save_helem_flags(pTHX_ HV *hv, SV *key, SV **sptr, const U32 flags)
660 PERL_ARGS_ASSERT_SAVE_HELEM_FLAGS;
664 SSPUSHPTR(SvREFCNT_inc_simple(hv));
665 SSPUSHPTR(newSVsv(key));
666 SSPUSHPTR(SvREFCNT_inc(*sptr));
667 SSPUSHUV(SAVEt_HELEM);
668 save_scalar_at(sptr, flags);
669 if (flags & SAVEf_KEEPOLDELEM)
672 /* If we're localizing a tied hash element, this new sv
673 * won't actually be stored in the hash - so it won't get
674 * reaped when the localize ends. Ensure it gets reaped by
675 * mortifying it instead. DAPM */
676 if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
681 Perl_save_svref(pTHX_ SV **sptr)
685 PERL_ARGS_ASSERT_SAVE_SVREF;
688 save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_SVREF);
689 return save_scalar_at(sptr, SAVEf_SETMAGIC); /* XXX - FIXME - see #60360 */
693 Perl_save_alloc(pTHX_ I32 size, I32 pad)
696 register const I32 start = pad + ((char*)&PL_savestack[PL_savestack_ix]
697 - (char*)PL_savestack);
698 const UV elems = 1 + ((size + pad - 1) / sizeof(*PL_savestack));
699 const UV elems_shifted = elems << SAVE_TIGHT_SHIFT;
701 if ((elems_shifted >> SAVE_TIGHT_SHIFT) != elems)
702 Perl_croak(aTHX_ "panic: save_alloc elems %"UVuf" out of range (%ld-%ld)",
707 PL_savestack_ix += elems;
708 SSPUSHUV(SAVEt_ALLOC | elems_shifted);
713 Perl_leave_scope(pTHX_ I32 base)
724 /* Localise the effects of the TAINT_NOT inside the loop. */
725 const bool was = PL_tainted;
728 Perl_croak(aTHX_ "panic: corrupt saved stack index");
729 DEBUG_l(Perl_deb(aTHX_ "savestack: releasing items %ld -> %ld\n",
730 (long)PL_savestack_ix, (long)base));
731 while (PL_savestack_ix > base) {
733 const U8 type = (U8)uv & SAVE_MASK;
737 case SAVEt_ITEM: /* normal string */
738 value = MUTABLE_SV(SSPOPPTR);
739 sv = MUTABLE_SV(SSPOPPTR);
740 sv_replace(sv,value);
745 case SAVEt_SV: /* scalar reference */
746 value = MUTABLE_SV(SSPOPPTR);
747 gv = MUTABLE_GV(SSPOPPTR);
749 av = MUTABLE_AV(gv); /* what to refcnt_dec */
758 if (av) /* actually an av, hv or gv */
761 case SAVEt_GENERIC_PVREF: /* generic pv */
763 str = (char*)SSPOPPTR;
764 if (*(char**)ptr != str) {
765 Safefree(*(char**)ptr);
769 case SAVEt_SHARED_PVREF: /* shared pv */
770 str = (char*)SSPOPPTR;
772 if (*(char**)ptr != str) {
774 PerlMem_free(*(char**)ptr);
776 PerlMemShared_free(*(char**)ptr);
781 case SAVEt_GENERIC_SVREF: /* generic sv */
782 value = MUTABLE_SV(SSPOPPTR);
789 case SAVEt_AV: /* array reference */
790 av = MUTABLE_AV(SSPOPPTR);
791 gv = MUTABLE_GV(SSPOPPTR);
792 SvREFCNT_dec(GvAV(gv));
796 SvSETMAGIC(MUTABLE_SV(av));
800 case SAVEt_HV: /* hash reference */
801 hv = MUTABLE_HV(SSPOPPTR);
802 gv = MUTABLE_GV(SSPOPPTR);
803 SvREFCNT_dec(GvHV(gv));
807 SvSETMAGIC(MUTABLE_SV(hv));
811 case SAVEt_INT_SMALL:
813 *(int*)ptr = (int)(uv >> SAVE_TIGHT_SHIFT);
815 case SAVEt_INT: /* int reference */
817 *(int*)ptr = (int)SSPOPINT;
819 case SAVEt_BOOL: /* bool reference */
821 *(bool*)ptr = cBOOL(uv >> 8);
823 case SAVEt_I32_SMALL:
825 *(I32*)ptr = (I32)(uv >> SAVE_TIGHT_SHIFT);
827 case SAVEt_I32: /* I32 reference */
829 #ifdef PERL_DEBUG_READONLY_OPS
831 const I32 val = SSPOPINT;
832 if (*(I32*)ptr != val)
836 *(I32*)ptr = (I32)SSPOPINT;
839 case SAVEt_SPTR: /* SV* reference */
841 *(SV**)ptr = MUTABLE_SV(SSPOPPTR);
843 case SAVEt_VPTR: /* random* reference */
844 case SAVEt_PPTR: /* char* reference */
846 *(char**)ptr = (char*)SSPOPPTR;
848 case SAVEt_HPTR: /* HV* reference */
850 *(HV**)ptr = MUTABLE_HV(SSPOPPTR);
852 case SAVEt_APTR: /* AV* reference */
854 *(AV**)ptr = MUTABLE_AV(SSPOPPTR);
856 case SAVEt_GP: /* scalar reference */
857 gv = MUTABLE_GV(SSPOPPTR);
859 GvGP(gv) = (GP*)SSPOPPTR;
862 /* putting a method back into circulation ("local")*/
863 if (GvCVu(gv) && (hv=GvSTASH(gv)) && HvNAME_get(hv))
864 mro_method_changed_in(hv);
869 SvREFCNT_dec(MUTABLE_SV(ptr));
871 case SAVEt_MORTALIZESV:
873 sv_2mortal(MUTABLE_SV(ptr));
877 ASSERT_CURPAD_LEGAL("SAVEt_FREEOP"); /* XXX DAPM tmp */
885 ptr = (void*)&PL_curpad[uv >> SAVE_TIGHT_SHIFT];
888 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
889 "Pad 0x%"UVxf"[0x%"UVxf"] clearsv: %ld sv=0x%"UVxf"<%"IVdf"> %s\n",
890 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
891 (long)((SV **)ptr-PL_curpad), PTR2UV(sv), (IV)SvREFCNT(sv),
892 (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) ? "clear" : "abandon"
895 /* Can clear pad variable in place? */
896 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
898 * if a my variable that was made readonly is going out of
899 * scope, we want to remove the readonlyness so that it can
900 * go out of scope quietly
902 if (SvPADMY(sv) && !SvFAKE(sv))
905 if (SvTHINKFIRST(sv))
906 sv_force_normal_flags(sv, SV_IMMEDIATE_UNREF);
910 switch (SvTYPE(sv)) {
914 av_clear(MUTABLE_AV(sv));
917 hv_clear(MUTABLE_HV(sv));
920 Perl_croak(aTHX_ "panic: leave_scope pad code");
925 SvPADSTALE_on(sv); /* mark as no longer live */
927 else { /* Someone has a claim on this, so abandon it. */
928 const U32 padflags = SvFLAGS(sv) & (SVs_PADMY|SVs_PADTMP);
929 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
930 case SVt_PVAV: *(SV**)ptr = MUTABLE_SV(newAV()); break;
931 case SVt_PVHV: *(SV**)ptr = MUTABLE_SV(newHV()); break;
932 default: *(SV**)ptr = newSV(0); break;
934 SvREFCNT_dec(sv); /* Cast current value to the winds. */
935 /* preserve pad nature, but also mark as not live
936 * for any closure capturing */
937 SvFLAGS(*(SV**)ptr) |= padflags | SVs_PADSTALE;
942 hv = MUTABLE_HV(ptr);
945 (void)hv_delete(hv, (char*)ptr, i, G_DISCARD);
951 av = MUTABLE_AV(ptr);
953 (void)av_delete(av, i, G_DISCARD);
956 case SAVEt_DESTRUCTOR_X:
958 (*SSPOPDXPTR)(aTHX_ ptr);
960 case SAVEt_REGCONTEXT:
961 /* regexp must have croaked */
963 PL_savestack_ix -= uv >> SAVE_TIGHT_SHIFT;
965 case SAVEt_STACK_POS: /* Position on Perl stack */
967 PL_stack_sp = PL_stack_base + i;
969 case SAVEt_STACK_CXPOS: /* blk_oldsp on context stack */
971 cxstack[i].blk_oldsp = SSPOPINT;
973 case SAVEt_AELEM: /* array element */
974 value = MUTABLE_SV(SSPOPPTR);
976 av = MUTABLE_AV(SSPOPPTR);
977 ptr = av_fetch(av,i,1);
978 if (!AvREAL(av) && AvREIFY(av)) /* undo reify guard */
982 if (sv && sv != &PL_sv_undef) {
983 if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied))
984 SvREFCNT_inc_void_NN(sv);
991 case SAVEt_HELEM: /* hash element */
992 value = MUTABLE_SV(SSPOPPTR);
993 sv = MUTABLE_SV(SSPOPPTR);
994 hv = MUTABLE_HV(SSPOPPTR);
995 ptr = hv_fetch_ent(hv, sv, 1, 0);
998 const SV * const oval = HeVAL((HE*)ptr);
999 if (oval && oval != &PL_sv_undef) {
1000 ptr = &HeVAL((HE*)ptr);
1001 if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1002 SvREFCNT_inc_void(*(SV**)ptr);
1003 av = MUTABLE_AV(hv); /* what to refcnt_dec */
1008 SvREFCNT_dec(value);
1011 PL_op = (OP*)SSPOPPTR;
1014 if ((PL_hints & HINT_LOCALIZE_HH) && GvHV(PL_hintgv)) {
1015 SvREFCNT_dec(MUTABLE_SV(GvHV(PL_hintgv)));
1016 GvHV(PL_hintgv) = NULL;
1018 Perl_refcounted_he_free(aTHX_ PL_compiling.cop_hints_hash);
1019 PL_compiling.cop_hints_hash = (struct refcounted_he *) SSPOPPTR;
1020 *(I32*)&PL_hints = (I32)SSPOPINT;
1021 if (PL_hints & HINT_LOCALIZE_HH) {
1022 SvREFCNT_dec(MUTABLE_SV(GvHV(PL_hintgv)));
1023 GvHV(PL_hintgv) = MUTABLE_HV(SSPOPPTR);
1024 assert(GvHV(PL_hintgv));
1025 } else if (!GvHV(PL_hintgv)) {
1026 /* Need to add a new one manually, else gv_fetchpv() can
1027 add one in this code:
1029 if (SvTYPE(gv) == SVt_PVGV) {
1032 gv_init_sv(gv, sv_type);
1033 if (*name=='!' && sv_type == SVt_PVHV && len==1)
1039 and it won't have the magic set. */
1041 HV *const hv = newHV();
1042 hv_magic(hv, NULL, PERL_MAGIC_hints);
1043 GvHV(PL_hintgv) = hv;
1045 assert(GvHV(PL_hintgv));
1048 PL_comppad = (PAD*)SSPOPPTR;
1050 PL_curpad = AvARRAY(PL_comppad);
1054 case SAVEt_PADSV_AND_MORTALIZE:
1056 const PADOFFSET off = (PADOFFSET)SSPOPLONG;
1060 svp = AvARRAY((PAD*)ptr) + off;
1061 /* This mortalizing used to be done by POPLOOP() via itersave.
1062 But as we have all the information here, we can do it here,
1063 save even having to have itersave in the struct. */
1065 *svp = MUTABLE_SV(SSPOPPTR);
1068 case SAVEt_SAVESWITCHSTACK:
1071 AV *const t = MUTABLE_AV(SSPOPPTR);
1072 AV *const f = MUTABLE_AV(SSPOPPTR);
1074 PL_curstackinfo->si_stack = f;
1077 case SAVEt_SET_SVFLAGS:
1079 const U32 val = (U32)SSPOPINT;
1080 const U32 mask = (U32)SSPOPINT;
1081 sv = MUTABLE_SV(SSPOPPTR);
1082 SvFLAGS(sv) &= ~mask;
1087 /* This would be a mathom, but Perl_save_svref() calls a static
1088 function, S_save_scalar_at(), so has to stay in this file. */
1089 case SAVEt_SVREF: /* scalar reference */
1090 value = MUTABLE_SV(SSPOPPTR);
1092 av = NULL; /* what to refcnt_dec */
1095 /* These are only saved in mathoms.c */
1097 gv = MUTABLE_GV(SSPOPPTR);
1098 (void)sv_clear(MUTABLE_SV(gv));
1100 case SAVEt_LONG: /* long reference */
1102 *(long*)ptr = (long)SSPOPLONG;
1104 case SAVEt_IV: /* IV reference */
1106 *(IV*)ptr = (IV)SSPOPIV;
1109 case SAVEt_I16: /* I16 reference */
1111 *(I16*)ptr = (I16)(uv >> 8);
1113 case SAVEt_I8: /* I8 reference */
1115 *(I8*)ptr = (I8)(uv >> 8);
1117 case SAVEt_DESTRUCTOR:
1121 case SAVEt_COP_ARYBASE:
1124 CopARYBASE_set((COP *)ptr, i);
1126 case SAVEt_COMPILE_WARNINGS:
1129 if (!specialWARN(PL_compiling.cop_warnings))
1130 PerlMemShared_free(PL_compiling.cop_warnings);
1132 PL_compiling.cop_warnings = (STRLEN*)ptr;
1134 case SAVEt_RE_STATE:
1136 const struct re_save_state *const state
1137 = (struct re_save_state *)
1138 (PL_savestack + PL_savestack_ix
1139 - SAVESTACK_ALLOC_FOR_RE_SAVE_STATE);
1140 PL_savestack_ix -= SAVESTACK_ALLOC_FOR_RE_SAVE_STATE;
1142 if (PL_reg_start_tmp != state->re_state_reg_start_tmp) {
1143 Safefree(PL_reg_start_tmp);
1145 if (PL_reg_poscache != state->re_state_reg_poscache) {
1146 Safefree(PL_reg_poscache);
1148 Copy(state, &PL_reg_state, 1, struct re_save_state);
1153 parser_free((yy_parser *) ptr);
1156 Perl_croak(aTHX_ "panic: leave_scope inconsistency");
1166 Perl_cx_dump(pTHX_ PERL_CONTEXT *cx)
1170 PERL_ARGS_ASSERT_CX_DUMP;
1173 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]);
1174 if (CxTYPE(cx) != CXt_SUBST) {
1175 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
1176 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%"UVxf"\n",
1177 PTR2UV(cx->blk_oldcop));
1178 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
1179 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
1180 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%"UVxf"\n",
1181 PTR2UV(cx->blk_oldpm));
1182 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
1184 switch (CxTYPE(cx)) {
1189 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.CV = 0x%"UVxf"\n",
1190 PTR2UV(cx->blk_format.cv));
1191 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.GV = 0x%"UVxf"\n",
1192 PTR2UV(cx->blk_format.gv));
1193 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.DFOUTGV = 0x%"UVxf"\n",
1194 PTR2UV(cx->blk_format.dfoutgv));
1195 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.HASARGS = %d\n",
1196 (int)CxHASARGS(cx));
1197 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.RETOP = 0x%"UVxf"\n",
1198 PTR2UV(cx->blk_format.retop));
1201 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%"UVxf"\n",
1202 PTR2UV(cx->blk_sub.cv));
1203 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
1204 (long)cx->blk_sub.olddepth);
1205 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
1206 (int)CxHASARGS(cx));
1207 PerlIO_printf(Perl_debug_log, "BLK_SUB.LVAL = %d\n", (int)CxLVAL(cx));
1208 PerlIO_printf(Perl_debug_log, "BLK_SUB.RETOP = 0x%"UVxf"\n",
1209 PTR2UV(cx->blk_sub.retop));
1212 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
1213 (long)CxOLD_IN_EVAL(cx));
1214 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
1215 PL_op_name[CxOLD_OP_TYPE(cx)],
1216 PL_op_desc[CxOLD_OP_TYPE(cx)]);
1217 if (cx->blk_eval.old_namesv)
1218 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
1219 SvPVX_const(cx->blk_eval.old_namesv));
1220 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%"UVxf"\n",
1221 PTR2UV(cx->blk_eval.old_eval_root));
1222 PerlIO_printf(Perl_debug_log, "BLK_EVAL.RETOP = 0x%"UVxf"\n",
1223 PTR2UV(cx->blk_eval.retop));
1226 case CXt_LOOP_LAZYIV:
1227 case CXt_LOOP_LAZYSV:
1229 case CXt_LOOP_PLAIN:
1230 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n", CxLABEL(cx));
1231 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
1232 (long)cx->blk_loop.resetsp);
1233 PerlIO_printf(Perl_debug_log, "BLK_LOOP.MY_OP = 0x%"UVxf"\n",
1234 PTR2UV(cx->blk_loop.my_op));
1235 PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%"UVxf"\n",
1236 PTR2UV(CX_LOOP_NEXTOP_GET(cx)));
1237 /* XXX: not accurate for LAZYSV/IV */
1238 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%"UVxf"\n",
1239 PTR2UV(cx->blk_loop.state_u.ary.ary));
1240 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
1241 (long)cx->blk_loop.state_u.ary.ix);
1242 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%"UVxf"\n",
1243 PTR2UV(CxITERVAR(cx)));
1247 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
1248 (long)cx->sb_iters);
1249 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
1250 (long)cx->sb_maxiters);
1251 PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n",
1252 (long)cx->sb_rflags);
1253 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
1255 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
1257 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%"UVxf"\n",
1258 PTR2UV(cx->sb_dstr));
1259 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%"UVxf"\n",
1260 PTR2UV(cx->sb_targ));
1261 PerlIO_printf(Perl_debug_log, "SB_S = 0x%"UVxf"\n",
1263 PerlIO_printf(Perl_debug_log, "SB_M = 0x%"UVxf"\n",
1265 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%"UVxf"\n",
1266 PTR2UV(cx->sb_strend));
1267 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%"UVxf"\n",
1268 PTR2UV(cx->sb_rxres));
1272 PERL_UNUSED_CONTEXT;
1273 PERL_UNUSED_ARG(cx);
1274 #endif /* DEBUGGING */
1279 * c-indentation-style: bsd
1281 * indent-tabs-mode: t
1284 * ex: set ts=8 sts=4 sw=4 noet: