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);
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 SvFLAGS(osv) |= (SvFLAGS(osv) &
187 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
189 if (!(flags & SAVEf_KEEPOLDELEM))
190 mg_localize(osv, sv, (flags & SAVEf_SETMAGIC) != 0);
197 Perl_save_pushptrptr(pTHX_ void *const ptr1, void *const ptr2, const int type)
207 Perl_save_scalar(pTHX_ GV *gv)
210 SV ** const sptr = &GvSVn(gv);
212 PERL_ARGS_ASSERT_SAVE_SCALAR;
217 save_pushptrptr(SvREFCNT_inc_simple(gv), SvREFCNT_inc(*sptr), SAVEt_SV);
218 return save_scalar_at(sptr, SAVEf_SETMAGIC); /* XXX - FIXME - see #60360 */
221 /* Like save_sptr(), but also SvREFCNT_dec()s the new value. Can be used to
222 * restore a global SV to its prior contents, freeing new value. */
224 Perl_save_generic_svref(pTHX_ SV **sptr)
228 PERL_ARGS_ASSERT_SAVE_GENERIC_SVREF;
230 save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_GENERIC_SVREF);
233 /* Like save_pptr(), but also Safefree()s the new value if it is different
234 * from the old one. Can be used to restore a global char* to its prior
235 * contents, freeing new value. */
237 Perl_save_generic_pvref(pTHX_ char **str)
241 PERL_ARGS_ASSERT_SAVE_GENERIC_PVREF;
243 save_pushptrptr(*str, str, SAVEt_GENERIC_PVREF);
246 /* Like save_generic_pvref(), but uses PerlMemShared_free() rather than Safefree().
247 * Can be used to restore a shared global char* to its prior
248 * contents, freeing new value. */
250 Perl_save_shared_pvref(pTHX_ char **str)
254 PERL_ARGS_ASSERT_SAVE_SHARED_PVREF;
256 save_pushptrptr(str, *str, SAVEt_SHARED_PVREF);
259 /* set the SvFLAGS specified by mask to the values in val */
262 Perl_save_set_svflags(pTHX_ SV* sv, U32 mask, U32 val)
266 PERL_ARGS_ASSERT_SAVE_SET_SVFLAGS;
272 SSPUSHUV(SAVEt_SET_SVFLAGS);
276 Perl_save_gp(pTHX_ GV *gv, I32 empty)
280 PERL_ARGS_ASSERT_SAVE_GP;
283 SSPUSHINT(SvFAKE(gv));
285 SSPUSHPTR(SvREFCNT_inc(gv));
288 /* Don't let the localized GV coerce into non-glob, otherwise we would
289 * not be able to restore GP upon leave from context if that happened */
293 GP *gp = Perl_newGP(aTHX_ gv);
296 mro_method_changed_in(GvSTASH(gv)); /* taking a method out of circulation ("local")*/
297 if (GvIOp(gv) && (IoFLAGS(GvIOp(gv)) & IOf_ARGV)) {
299 IoFLAGS(gp->gp_io) |= IOf_ARGV|IOf_START;
301 #ifdef PERL_DONT_CREATE_GVSV
302 if (gv == PL_errgv) {
303 /* We could scatter this logic everywhere by changing the
304 definition of ERRSV from GvSV() to GvSVn(), but it seems more
305 efficient to do this check once here. */
306 gp->gp_sv = newSV(0);
318 Perl_save_ary(pTHX_ GV *gv)
321 AV * const oav = GvAVn(gv);
324 PERL_ARGS_ASSERT_SAVE_ARY;
326 if (!AvREAL(oav) && AvREIFY(oav))
328 save_pushptrptr(gv, oav, SAVEt_AV);
333 mg_localize(MUTABLE_SV(oav), MUTABLE_SV(av), TRUE);
338 Perl_save_hash(pTHX_ GV *gv)
343 PERL_ARGS_ASSERT_SAVE_HASH;
345 save_pushptrptr(gv, (ohv = GvHVn(gv)), SAVEt_HV);
350 mg_localize(MUTABLE_SV(ohv), MUTABLE_SV(hv), TRUE);
355 Perl_save_item(pTHX_ register SV *item)
358 register SV * const sv = newSVsv(item);
360 PERL_ARGS_ASSERT_SAVE_ITEM;
362 save_pushptrptr(item, /* remember the pointer */
363 sv, /* remember the value */
368 Perl_save_bool(pTHX_ bool *boolp)
372 PERL_ARGS_ASSERT_SAVE_BOOL;
376 SSPUSHUV(SAVEt_BOOL | (*boolp << 8));
380 Perl_save_pushi32ptr(pTHX_ const I32 i, void *const ptr, const int type)
390 Perl_save_int(pTHX_ int *intp)
393 const UV shifted = (UV)*intp << SAVE_TIGHT_SHIFT;
395 PERL_ARGS_ASSERT_SAVE_INT;
397 if ((int)(shifted >> SAVE_TIGHT_SHIFT) == *intp) {
400 SSPUSHUV(SAVEt_INT_SMALL | shifted);
402 save_pushi32ptr(*intp, intp, SAVEt_INT);
406 Perl_save_I8(pTHX_ I8 *bytep)
410 PERL_ARGS_ASSERT_SAVE_I8;
414 SSPUSHUV(SAVEt_I8 | ((UV)*bytep << 8));
418 Perl_save_I16(pTHX_ I16 *intp)
422 PERL_ARGS_ASSERT_SAVE_I16;
426 SSPUSHUV(SAVEt_I16 | ((UV)*intp << 8));
430 Perl_save_I32(pTHX_ I32 *intp)
433 const UV shifted = (UV)*intp << SAVE_TIGHT_SHIFT;
435 PERL_ARGS_ASSERT_SAVE_I32;
437 if ((I32)(shifted >> SAVE_TIGHT_SHIFT) == *intp) {
440 SSPUSHUV(SAVEt_I32_SMALL | shifted);
442 save_pushi32ptr(*intp, intp, SAVEt_I32);
445 /* Cannot use save_sptr() to store a char* since the SV** cast will
446 * force word-alignment and we'll miss the pointer.
449 Perl_save_pptr(pTHX_ char **pptr)
453 PERL_ARGS_ASSERT_SAVE_PPTR;
455 save_pushptrptr(*pptr, pptr, SAVEt_PPTR);
459 Perl_save_vptr(pTHX_ void *ptr)
463 PERL_ARGS_ASSERT_SAVE_VPTR;
465 save_pushptrptr(*(char**)ptr, ptr, SAVEt_VPTR);
469 Perl_save_sptr(pTHX_ SV **sptr)
473 PERL_ARGS_ASSERT_SAVE_SPTR;
475 save_pushptrptr(*sptr, sptr, SAVEt_SPTR);
479 Perl_save_padsv_and_mortalize(pTHX_ PADOFFSET off)
483 ASSERT_CURPAD_ACTIVE("save_padsv");
484 SSPUSHPTR(SvREFCNT_inc_simple_NN(PL_curpad[off]));
485 SSPUSHPTR(PL_comppad);
486 SSPUSHLONG((long)off);
487 SSPUSHUV(SAVEt_PADSV_AND_MORTALIZE);
491 Perl_save_hptr(pTHX_ HV **hptr)
495 PERL_ARGS_ASSERT_SAVE_HPTR;
497 save_pushptrptr(*hptr, hptr, SAVEt_HPTR);
501 Perl_save_aptr(pTHX_ AV **aptr)
505 PERL_ARGS_ASSERT_SAVE_APTR;
507 save_pushptrptr(*aptr, aptr, SAVEt_APTR);
511 Perl_save_pushptr(pTHX_ void *const ptr, const int type)
520 Perl_save_clearsv(pTHX_ SV **svp)
523 const UV offset = svp - PL_curpad;
524 const UV offset_shifted = offset << SAVE_TIGHT_SHIFT;
526 PERL_ARGS_ASSERT_SAVE_CLEARSV;
528 ASSERT_CURPAD_ACTIVE("save_clearsv");
529 if ((offset_shifted >> SAVE_TIGHT_SHIFT) != offset)
530 Perl_croak(aTHX_ "panic: pad offset %"UVuf" out of range (%p-%p)",
531 offset, svp, PL_curpad);
534 SSPUSHUV(offset_shifted | SAVEt_CLEARSV);
535 SvPADSTALE_off(*svp); /* mark lexical as active */
539 Perl_save_delete(pTHX_ HV *hv, char *key, I32 klen)
543 PERL_ARGS_ASSERT_SAVE_DELETE;
545 save_pushptri32ptr(key, klen, SvREFCNT_inc_simple(hv), SAVEt_DELETE);
549 Perl_save_hdelete(pTHX_ HV *hv, SV *keysv)
555 PERL_ARGS_ASSERT_SAVE_HDELETE;
557 key = SvPV_const(keysv, len);
558 klen = SvUTF8(keysv) ? -(I32)len : (I32)len;
559 SvREFCNT_inc_simple_void_NN(hv);
560 save_pushptri32ptr(savepvn(key, len), klen, hv, SAVEt_DELETE);
564 Perl_save_adelete(pTHX_ AV *av, I32 key)
568 PERL_ARGS_ASSERT_SAVE_ADELETE;
570 SvREFCNT_inc_void(av);
571 save_pushi32ptr(key, av, SAVEt_ADELETE);
575 Perl_save_destructor(pTHX_ DESTRUCTORFUNC_NOCONTEXT_t f, void* p)
579 PERL_ARGS_ASSERT_SAVE_DESTRUCTOR;
584 SSPUSHUV(SAVEt_DESTRUCTOR);
588 Perl_save_destructor_x(pTHX_ DESTRUCTORFUNC_t f, void* p)
594 SSPUSHUV(SAVEt_DESTRUCTOR_X);
598 Perl_save_hints(pTHX)
601 COPHH *save_cophh = cophh_copy(CopHINTHASH_get(&PL_compiling));
602 if (PL_hints & HINT_LOCALIZE_HH) {
603 save_pushptri32ptr(GvHV(PL_hintgv), PL_hints, save_cophh, SAVEt_HINTS);
604 GvHV(PL_hintgv) = hv_copy_hints_hv(GvHV(PL_hintgv));
606 save_pushi32ptr(PL_hints, save_cophh, SAVEt_HINTS);
611 S_save_pushptri32ptr(pTHX_ void *const ptr1, const I32 i, void *const ptr2,
622 Perl_save_aelem_flags(pTHX_ AV *av, I32 idx, SV **sptr, const U32 flags)
627 PERL_ARGS_ASSERT_SAVE_AELEM_FLAGS;
630 save_pushptri32ptr(SvREFCNT_inc_simple(av), idx, SvREFCNT_inc(*sptr),
632 /* if it gets reified later, the restore will have the wrong refcnt */
633 if (!AvREAL(av) && AvREIFY(av))
634 SvREFCNT_inc_void(*sptr);
635 save_scalar_at(sptr, flags); /* XXX - FIXME - see #60360 */
636 if (flags & SAVEf_KEEPOLDELEM)
639 /* If we're localizing a tied array element, this new sv
640 * won't actually be stored in the array - so it won't get
641 * reaped when the localize ends. Ensure it gets reaped by
642 * mortifying it instead. DAPM */
643 if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied))
648 Perl_save_helem_flags(pTHX_ HV *hv, SV *key, SV **sptr, const U32 flags)
653 PERL_ARGS_ASSERT_SAVE_HELEM_FLAGS;
657 SSPUSHPTR(SvREFCNT_inc_simple(hv));
658 SSPUSHPTR(newSVsv(key));
659 SSPUSHPTR(SvREFCNT_inc(*sptr));
660 SSPUSHUV(SAVEt_HELEM);
661 save_scalar_at(sptr, flags);
662 if (flags & SAVEf_KEEPOLDELEM)
665 /* If we're localizing a tied hash element, this new sv
666 * won't actually be stored in the hash - so it won't get
667 * reaped when the localize ends. Ensure it gets reaped by
668 * mortifying it instead. DAPM */
669 if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
674 Perl_save_svref(pTHX_ SV **sptr)
678 PERL_ARGS_ASSERT_SAVE_SVREF;
681 save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_SVREF);
682 return save_scalar_at(sptr, SAVEf_SETMAGIC); /* XXX - FIXME - see #60360 */
686 Perl_save_alloc(pTHX_ I32 size, I32 pad)
689 register const I32 start = pad + ((char*)&PL_savestack[PL_savestack_ix]
690 - (char*)PL_savestack);
691 const UV elems = 1 + ((size + pad - 1) / sizeof(*PL_savestack));
692 const UV elems_shifted = elems << SAVE_TIGHT_SHIFT;
694 if ((elems_shifted >> SAVE_TIGHT_SHIFT) != elems)
695 Perl_croak(aTHX_ "panic: save_alloc elems %"UVuf" out of range (%ld-%ld)",
700 PL_savestack_ix += elems;
701 SSPUSHUV(SAVEt_ALLOC | elems_shifted);
706 Perl_leave_scope(pTHX_ I32 base)
717 /* Localise the effects of the TAINT_NOT inside the loop. */
718 const bool was = PL_tainted;
721 Perl_croak(aTHX_ "panic: corrupt saved stack index");
722 DEBUG_l(Perl_deb(aTHX_ "savestack: releasing items %ld -> %ld\n",
723 (long)PL_savestack_ix, (long)base));
724 while (PL_savestack_ix > base) {
726 const U8 type = (U8)uv & SAVE_MASK;
730 case SAVEt_ITEM: /* normal string */
731 value = MUTABLE_SV(SSPOPPTR);
732 sv = MUTABLE_SV(SSPOPPTR);
733 sv_replace(sv,value);
738 case SAVEt_SV: /* scalar reference */
739 value = MUTABLE_SV(SSPOPPTR);
740 gv = MUTABLE_GV(SSPOPPTR);
742 av = MUTABLE_AV(gv); /* what to refcnt_dec */
751 if (av) /* actually an av, hv or gv */
754 case SAVEt_GENERIC_PVREF: /* generic pv */
756 str = (char*)SSPOPPTR;
757 if (*(char**)ptr != str) {
758 Safefree(*(char**)ptr);
762 case SAVEt_SHARED_PVREF: /* shared pv */
763 str = (char*)SSPOPPTR;
765 if (*(char**)ptr != str) {
767 PerlMem_free(*(char**)ptr);
769 PerlMemShared_free(*(char**)ptr);
774 case SAVEt_GVSV: /* scalar slot in GV */
775 value = MUTABLE_SV(SSPOPPTR);
776 gv = MUTABLE_GV(SSPOPPTR);
779 case SAVEt_GENERIC_SVREF: /* generic sv */
780 value = MUTABLE_SV(SSPOPPTR);
788 case SAVEt_AV: /* array reference */
789 av = MUTABLE_AV(SSPOPPTR);
790 gv = MUTABLE_GV(SSPOPPTR);
791 SvREFCNT_dec(GvAV(gv));
795 SvSETMAGIC(MUTABLE_SV(av));
799 case SAVEt_HV: /* hash reference */
800 hv = MUTABLE_HV(SSPOPPTR);
801 gv = MUTABLE_GV(SSPOPPTR);
802 SvREFCNT_dec(GvHV(gv));
806 SvSETMAGIC(MUTABLE_SV(hv));
810 case SAVEt_INT_SMALL:
812 *(int*)ptr = (int)(uv >> SAVE_TIGHT_SHIFT);
814 case SAVEt_INT: /* int reference */
816 *(int*)ptr = (int)SSPOPINT;
818 case SAVEt_BOOL: /* bool reference */
820 *(bool*)ptr = cBOOL(uv >> 8);
822 case SAVEt_I32_SMALL:
824 *(I32*)ptr = (I32)(uv >> SAVE_TIGHT_SHIFT);
826 case SAVEt_I32: /* I32 reference */
828 #ifdef PERL_DEBUG_READONLY_OPS
830 const I32 val = SSPOPINT;
831 if (*(I32*)ptr != val)
835 *(I32*)ptr = (I32)SSPOPINT;
838 case SAVEt_SPTR: /* SV* reference */
840 *(SV**)ptr = MUTABLE_SV(SSPOPPTR);
842 case SAVEt_VPTR: /* random* reference */
843 case SAVEt_PPTR: /* char* reference */
845 *(char**)ptr = (char*)SSPOPPTR;
847 case SAVEt_HPTR: /* HV* reference */
849 *(HV**)ptr = MUTABLE_HV(SSPOPPTR);
851 case SAVEt_APTR: /* AV* reference */
853 *(AV**)ptr = MUTABLE_AV(SSPOPPTR);
855 case SAVEt_GP: /* scalar reference */
856 gv = MUTABLE_GV(SSPOPPTR);
858 GvGP(gv) = (GP*)SSPOPPTR;
861 /* putting a method back into circulation ("local")*/
862 if (GvCVu(gv) && (hv=GvSTASH(gv)) && HvENAME_get(hv))
863 mro_method_changed_in(hv);
868 SvREFCNT_dec(MUTABLE_SV(ptr));
870 case SAVEt_FREECOPHH:
872 cophh_free((COPHH *)ptr);
874 case SAVEt_MORTALIZESV:
876 sv_2mortal(MUTABLE_SV(ptr));
880 ASSERT_CURPAD_LEGAL("SAVEt_FREEOP"); /* XXX DAPM tmp */
888 ptr = (void*)&PL_curpad[uv >> SAVE_TIGHT_SHIFT];
891 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
892 "Pad 0x%"UVxf"[0x%"UVxf"] clearsv: %ld sv=0x%"UVxf"<%"IVdf"> %s\n",
893 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
894 (long)((SV **)ptr-PL_curpad), PTR2UV(sv), (IV)SvREFCNT(sv),
895 (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) ? "clear" : "abandon"
898 /* Can clear pad variable in place? */
899 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
901 * if a my variable that was made readonly is going out of
902 * scope, we want to remove the readonlyness so that it can
903 * go out of scope quietly
905 if (SvPADMY(sv) && !SvFAKE(sv))
908 if (SvTHINKFIRST(sv))
909 sv_force_normal_flags(sv, SV_IMMEDIATE_UNREF);
913 switch (SvTYPE(sv)) {
917 av_clear(MUTABLE_AV(sv));
920 hv_clear(MUTABLE_HV(sv));
923 Perl_croak(aTHX_ "panic: leave_scope pad code");
928 SvPADSTALE_on(sv); /* mark as no longer live */
930 else { /* Someone has a claim on this, so abandon it. */
931 const U32 padflags = SvFLAGS(sv) & (SVs_PADMY|SVs_PADTMP);
932 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
933 case SVt_PVAV: *(SV**)ptr = MUTABLE_SV(newAV()); break;
934 case SVt_PVHV: *(SV**)ptr = MUTABLE_SV(newHV()); break;
935 default: *(SV**)ptr = newSV(0); break;
937 SvREFCNT_dec(sv); /* Cast current value to the winds. */
938 /* preserve pad nature, but also mark as not live
939 * for any closure capturing */
940 SvFLAGS(*(SV**)ptr) |= padflags | SVs_PADSTALE;
945 hv = MUTABLE_HV(ptr);
948 (void)hv_delete(hv, (char*)ptr, i, G_DISCARD);
954 av = MUTABLE_AV(ptr);
956 (void)av_delete(av, i, G_DISCARD);
959 case SAVEt_DESTRUCTOR_X:
961 (*SSPOPDXPTR)(aTHX_ ptr);
963 case SAVEt_REGCONTEXT:
964 /* regexp must have croaked */
966 PL_savestack_ix -= uv >> SAVE_TIGHT_SHIFT;
968 case SAVEt_STACK_POS: /* Position on Perl stack */
970 PL_stack_sp = PL_stack_base + i;
972 case SAVEt_STACK_CXPOS: /* blk_oldsp on context stack */
974 cxstack[i].blk_oldsp = SSPOPINT;
976 case SAVEt_AELEM: /* array element */
977 value = MUTABLE_SV(SSPOPPTR);
979 av = MUTABLE_AV(SSPOPPTR);
980 ptr = av_fetch(av,i,1);
981 if (!AvREAL(av) && AvREIFY(av)) /* undo reify guard */
985 if (sv && sv != &PL_sv_undef) {
986 if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied))
987 SvREFCNT_inc_void_NN(sv);
994 case SAVEt_HELEM: /* hash element */
995 value = MUTABLE_SV(SSPOPPTR);
996 sv = MUTABLE_SV(SSPOPPTR);
997 hv = MUTABLE_HV(SSPOPPTR);
998 ptr = hv_fetch_ent(hv, sv, 1, 0);
1001 const SV * const oval = HeVAL((HE*)ptr);
1002 if (oval && oval != &PL_sv_undef) {
1003 ptr = &HeVAL((HE*)ptr);
1004 if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1005 SvREFCNT_inc_void(*(SV**)ptr);
1006 av = MUTABLE_AV(hv); /* what to refcnt_dec */
1011 SvREFCNT_dec(value);
1014 PL_op = (OP*)SSPOPPTR;
1017 if ((PL_hints & HINT_LOCALIZE_HH) && GvHV(PL_hintgv)) {
1018 SvREFCNT_dec(MUTABLE_SV(GvHV(PL_hintgv)));
1019 GvHV(PL_hintgv) = NULL;
1021 cophh_free(CopHINTHASH_get(&PL_compiling));
1022 CopHINTHASH_set(&PL_compiling, (COPHH*)SSPOPPTR);
1023 *(I32*)&PL_hints = (I32)SSPOPINT;
1024 if (PL_hints & HINT_LOCALIZE_HH) {
1025 SvREFCNT_dec(MUTABLE_SV(GvHV(PL_hintgv)));
1026 GvHV(PL_hintgv) = MUTABLE_HV(SSPOPPTR);
1027 assert(GvHV(PL_hintgv));
1028 } else if (!GvHV(PL_hintgv)) {
1029 /* Need to add a new one manually, else gv_fetchpv() can
1030 add one in this code:
1032 if (SvTYPE(gv) == SVt_PVGV) {
1035 gv_init_sv(gv, sv_type);
1036 if (*name=='!' && sv_type == SVt_PVHV && len==1)
1042 and it won't have the magic set. */
1044 HV *const hv = newHV();
1045 hv_magic(hv, NULL, PERL_MAGIC_hints);
1046 GvHV(PL_hintgv) = hv;
1048 assert(GvHV(PL_hintgv));
1051 PL_comppad = (PAD*)SSPOPPTR;
1053 PL_curpad = AvARRAY(PL_comppad);
1057 case SAVEt_PADSV_AND_MORTALIZE:
1059 const PADOFFSET off = (PADOFFSET)SSPOPLONG;
1063 svp = AvARRAY((PAD*)ptr) + off;
1064 /* This mortalizing used to be done by POPLOOP() via itersave.
1065 But as we have all the information here, we can do it here,
1066 save even having to have itersave in the struct. */
1068 *svp = MUTABLE_SV(SSPOPPTR);
1071 case SAVEt_SAVESWITCHSTACK:
1074 AV *const t = MUTABLE_AV(SSPOPPTR);
1075 AV *const f = MUTABLE_AV(SSPOPPTR);
1077 PL_curstackinfo->si_stack = f;
1080 case SAVEt_SET_SVFLAGS:
1082 const U32 val = (U32)SSPOPINT;
1083 const U32 mask = (U32)SSPOPINT;
1084 sv = MUTABLE_SV(SSPOPPTR);
1085 SvFLAGS(sv) &= ~mask;
1090 /* This would be a mathom, but Perl_save_svref() calls a static
1091 function, S_save_scalar_at(), so has to stay in this file. */
1092 case SAVEt_SVREF: /* scalar reference */
1093 value = MUTABLE_SV(SSPOPPTR);
1095 av = NULL; /* what to refcnt_dec */
1098 /* These are only saved in mathoms.c */
1100 gv = MUTABLE_GV(SSPOPPTR);
1101 (void)sv_clear(MUTABLE_SV(gv));
1103 case SAVEt_LONG: /* long reference */
1105 *(long*)ptr = (long)SSPOPLONG;
1107 case SAVEt_IV: /* IV reference */
1109 *(IV*)ptr = (IV)SSPOPIV;
1112 case SAVEt_I16: /* I16 reference */
1114 *(I16*)ptr = (I16)(uv >> 8);
1116 case SAVEt_I8: /* I8 reference */
1118 *(I8*)ptr = (I8)(uv >> 8);
1120 case SAVEt_DESTRUCTOR:
1124 case SAVEt_COP_ARYBASE:
1127 CopARYBASE_set((COP *)ptr, i);
1129 case SAVEt_COMPILE_WARNINGS:
1132 if (!specialWARN(PL_compiling.cop_warnings))
1133 PerlMemShared_free(PL_compiling.cop_warnings);
1135 PL_compiling.cop_warnings = (STRLEN*)ptr;
1137 case SAVEt_RE_STATE:
1139 const struct re_save_state *const state
1140 = (struct re_save_state *)
1141 (PL_savestack + PL_savestack_ix
1142 - SAVESTACK_ALLOC_FOR_RE_SAVE_STATE);
1143 PL_savestack_ix -= SAVESTACK_ALLOC_FOR_RE_SAVE_STATE;
1145 if (PL_reg_start_tmp != state->re_state_reg_start_tmp) {
1146 Safefree(PL_reg_start_tmp);
1148 if (PL_reg_poscache != state->re_state_reg_poscache) {
1149 Safefree(PL_reg_poscache);
1151 Copy(state, &PL_reg_state, 1, struct re_save_state);
1156 parser_free((yy_parser *) ptr);
1159 Perl_croak(aTHX_ "panic: leave_scope inconsistency");
1169 Perl_cx_dump(pTHX_ PERL_CONTEXT *cx)
1173 PERL_ARGS_ASSERT_CX_DUMP;
1176 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]);
1177 if (CxTYPE(cx) != CXt_SUBST) {
1178 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
1179 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%"UVxf"\n",
1180 PTR2UV(cx->blk_oldcop));
1181 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
1182 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
1183 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%"UVxf"\n",
1184 PTR2UV(cx->blk_oldpm));
1185 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
1187 switch (CxTYPE(cx)) {
1192 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.CV = 0x%"UVxf"\n",
1193 PTR2UV(cx->blk_format.cv));
1194 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.GV = 0x%"UVxf"\n",
1195 PTR2UV(cx->blk_format.gv));
1196 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.DFOUTGV = 0x%"UVxf"\n",
1197 PTR2UV(cx->blk_format.dfoutgv));
1198 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.HASARGS = %d\n",
1199 (int)CxHASARGS(cx));
1200 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.RETOP = 0x%"UVxf"\n",
1201 PTR2UV(cx->blk_format.retop));
1204 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%"UVxf"\n",
1205 PTR2UV(cx->blk_sub.cv));
1206 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
1207 (long)cx->blk_sub.olddepth);
1208 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
1209 (int)CxHASARGS(cx));
1210 PerlIO_printf(Perl_debug_log, "BLK_SUB.LVAL = %d\n", (int)CxLVAL(cx));
1211 PerlIO_printf(Perl_debug_log, "BLK_SUB.RETOP = 0x%"UVxf"\n",
1212 PTR2UV(cx->blk_sub.retop));
1215 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
1216 (long)CxOLD_IN_EVAL(cx));
1217 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
1218 PL_op_name[CxOLD_OP_TYPE(cx)],
1219 PL_op_desc[CxOLD_OP_TYPE(cx)]);
1220 if (cx->blk_eval.old_namesv)
1221 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
1222 SvPVX_const(cx->blk_eval.old_namesv));
1223 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%"UVxf"\n",
1224 PTR2UV(cx->blk_eval.old_eval_root));
1225 PerlIO_printf(Perl_debug_log, "BLK_EVAL.RETOP = 0x%"UVxf"\n",
1226 PTR2UV(cx->blk_eval.retop));
1229 case CXt_LOOP_LAZYIV:
1230 case CXt_LOOP_LAZYSV:
1232 case CXt_LOOP_PLAIN:
1233 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n", CxLABEL(cx));
1234 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
1235 (long)cx->blk_loop.resetsp);
1236 PerlIO_printf(Perl_debug_log, "BLK_LOOP.MY_OP = 0x%"UVxf"\n",
1237 PTR2UV(cx->blk_loop.my_op));
1238 /* XXX: not accurate for LAZYSV/IV */
1239 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%"UVxf"\n",
1240 PTR2UV(cx->blk_loop.state_u.ary.ary));
1241 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
1242 (long)cx->blk_loop.state_u.ary.ix);
1243 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%"UVxf"\n",
1244 PTR2UV(CxITERVAR(cx)));
1248 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
1249 (long)cx->sb_iters);
1250 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
1251 (long)cx->sb_maxiters);
1252 PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n",
1253 (long)cx->sb_rflags);
1254 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
1256 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
1258 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%"UVxf"\n",
1259 PTR2UV(cx->sb_dstr));
1260 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%"UVxf"\n",
1261 PTR2UV(cx->sb_targ));
1262 PerlIO_printf(Perl_debug_log, "SB_S = 0x%"UVxf"\n",
1264 PerlIO_printf(Perl_debug_log, "SB_M = 0x%"UVxf"\n",
1266 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%"UVxf"\n",
1267 PTR2UV(cx->sb_strend));
1268 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%"UVxf"\n",
1269 PTR2UV(cx->sb_rxres));
1273 PERL_UNUSED_CONTEXT;
1274 PERL_UNUSED_ARG(cx);
1275 #endif /* DEBUGGING */
1280 * c-indentation-style: bsd
1282 * indent-tabs-mode: t
1285 * ex: set ts=8 sts=4 sw=4 noet: