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 if (PL_compiling.cop_hints_hash) {
603 PL_compiling.cop_hints_hash->refcounted_he_refcnt++;
606 if (PL_hints & HINT_LOCALIZE_HH) {
607 save_pushptri32ptr(GvHV(PL_hintgv), PL_hints,
608 PL_compiling.cop_hints_hash, SAVEt_HINTS);
609 GvHV(PL_hintgv) = hv_copy_hints_hv(GvHV(PL_hintgv));
611 save_pushi32ptr(PL_hints, PL_compiling.cop_hints_hash, SAVEt_HINTS);
616 S_save_pushptri32ptr(pTHX_ void *const ptr1, const I32 i, void *const ptr2,
627 Perl_save_aelem_flags(pTHX_ AV *av, I32 idx, SV **sptr, const U32 flags)
632 PERL_ARGS_ASSERT_SAVE_AELEM_FLAGS;
635 save_pushptri32ptr(SvREFCNT_inc_simple(av), idx, SvREFCNT_inc(*sptr),
637 /* if it gets reified later, the restore will have the wrong refcnt */
638 if (!AvREAL(av) && AvREIFY(av))
639 SvREFCNT_inc_void(*sptr);
640 save_scalar_at(sptr, flags); /* XXX - FIXME - see #60360 */
641 if (flags & SAVEf_KEEPOLDELEM)
644 /* If we're localizing a tied array element, this new sv
645 * won't actually be stored in the array - so it won't get
646 * reaped when the localize ends. Ensure it gets reaped by
647 * mortifying it instead. DAPM */
648 if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied))
653 Perl_save_helem_flags(pTHX_ HV *hv, SV *key, SV **sptr, const U32 flags)
658 PERL_ARGS_ASSERT_SAVE_HELEM_FLAGS;
662 SSPUSHPTR(SvREFCNT_inc_simple(hv));
663 SSPUSHPTR(newSVsv(key));
664 SSPUSHPTR(SvREFCNT_inc(*sptr));
665 SSPUSHUV(SAVEt_HELEM);
666 save_scalar_at(sptr, flags);
667 if (flags & SAVEf_KEEPOLDELEM)
670 /* If we're localizing a tied hash element, this new sv
671 * won't actually be stored in the hash - so it won't get
672 * reaped when the localize ends. Ensure it gets reaped by
673 * mortifying it instead. DAPM */
674 if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
679 Perl_save_svref(pTHX_ SV **sptr)
683 PERL_ARGS_ASSERT_SAVE_SVREF;
686 save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_SVREF);
687 return save_scalar_at(sptr, SAVEf_SETMAGIC); /* XXX - FIXME - see #60360 */
691 Perl_save_alloc(pTHX_ I32 size, I32 pad)
694 register const I32 start = pad + ((char*)&PL_savestack[PL_savestack_ix]
695 - (char*)PL_savestack);
696 const UV elems = 1 + ((size + pad - 1) / sizeof(*PL_savestack));
697 const UV elems_shifted = elems << SAVE_TIGHT_SHIFT;
699 if ((elems_shifted >> SAVE_TIGHT_SHIFT) != elems)
700 Perl_croak(aTHX_ "panic: save_alloc elems %"UVuf" out of range (%ld-%ld)",
705 PL_savestack_ix += elems;
706 SSPUSHUV(SAVEt_ALLOC | elems_shifted);
711 Perl_leave_scope(pTHX_ I32 base)
722 /* Localise the effects of the TAINT_NOT inside the loop. */
723 const bool was = PL_tainted;
726 Perl_croak(aTHX_ "panic: corrupt saved stack index");
727 DEBUG_l(Perl_deb(aTHX_ "savestack: releasing items %ld -> %ld\n",
728 (long)PL_savestack_ix, (long)base));
729 while (PL_savestack_ix > base) {
731 const U8 type = (U8)uv & SAVE_MASK;
735 case SAVEt_ITEM: /* normal string */
736 value = MUTABLE_SV(SSPOPPTR);
737 sv = MUTABLE_SV(SSPOPPTR);
738 sv_replace(sv,value);
743 case SAVEt_SV: /* scalar reference */
744 value = MUTABLE_SV(SSPOPPTR);
745 gv = MUTABLE_GV(SSPOPPTR);
747 av = MUTABLE_AV(gv); /* what to refcnt_dec */
756 if (av) /* actually an av, hv or gv */
759 case SAVEt_GENERIC_PVREF: /* generic pv */
761 str = (char*)SSPOPPTR;
762 if (*(char**)ptr != str) {
763 Safefree(*(char**)ptr);
767 case SAVEt_SHARED_PVREF: /* shared pv */
768 str = (char*)SSPOPPTR;
770 if (*(char**)ptr != str) {
772 PerlMem_free(*(char**)ptr);
774 PerlMemShared_free(*(char**)ptr);
779 case SAVEt_GVSV: /* scalar slot in GV */
780 value = MUTABLE_SV(SSPOPPTR);
781 gv = MUTABLE_GV(SSPOPPTR);
784 case SAVEt_GENERIC_SVREF: /* generic sv */
785 value = MUTABLE_SV(SSPOPPTR);
793 case SAVEt_AV: /* array reference */
794 av = MUTABLE_AV(SSPOPPTR);
795 gv = MUTABLE_GV(SSPOPPTR);
796 SvREFCNT_dec(GvAV(gv));
800 SvSETMAGIC(MUTABLE_SV(av));
804 case SAVEt_HV: /* hash reference */
805 hv = MUTABLE_HV(SSPOPPTR);
806 gv = MUTABLE_GV(SSPOPPTR);
807 SvREFCNT_dec(GvHV(gv));
811 SvSETMAGIC(MUTABLE_SV(hv));
815 case SAVEt_INT_SMALL:
817 *(int*)ptr = (int)(uv >> SAVE_TIGHT_SHIFT);
819 case SAVEt_INT: /* int reference */
821 *(int*)ptr = (int)SSPOPINT;
823 case SAVEt_BOOL: /* bool reference */
825 *(bool*)ptr = cBOOL(uv >> 8);
827 case SAVEt_I32_SMALL:
829 *(I32*)ptr = (I32)(uv >> SAVE_TIGHT_SHIFT);
831 case SAVEt_I32: /* I32 reference */
833 #ifdef PERL_DEBUG_READONLY_OPS
835 const I32 val = SSPOPINT;
836 if (*(I32*)ptr != val)
840 *(I32*)ptr = (I32)SSPOPINT;
843 case SAVEt_SPTR: /* SV* reference */
845 *(SV**)ptr = MUTABLE_SV(SSPOPPTR);
847 case SAVEt_VPTR: /* random* reference */
848 case SAVEt_PPTR: /* char* reference */
850 *(char**)ptr = (char*)SSPOPPTR;
852 case SAVEt_HPTR: /* HV* reference */
854 *(HV**)ptr = MUTABLE_HV(SSPOPPTR);
856 case SAVEt_APTR: /* AV* reference */
858 *(AV**)ptr = MUTABLE_AV(SSPOPPTR);
860 case SAVEt_GP: /* scalar reference */
861 gv = MUTABLE_GV(SSPOPPTR);
863 GvGP(gv) = (GP*)SSPOPPTR;
866 /* putting a method back into circulation ("local")*/
867 if (GvCVu(gv) && (hv=GvSTASH(gv)) && HvNAME_get(hv))
868 mro_method_changed_in(hv);
873 SvREFCNT_dec(MUTABLE_SV(ptr));
875 case SAVEt_MORTALIZESV:
877 sv_2mortal(MUTABLE_SV(ptr));
881 ASSERT_CURPAD_LEGAL("SAVEt_FREEOP"); /* XXX DAPM tmp */
889 ptr = (void*)&PL_curpad[uv >> SAVE_TIGHT_SHIFT];
892 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
893 "Pad 0x%"UVxf"[0x%"UVxf"] clearsv: %ld sv=0x%"UVxf"<%"IVdf"> %s\n",
894 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
895 (long)((SV **)ptr-PL_curpad), PTR2UV(sv), (IV)SvREFCNT(sv),
896 (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) ? "clear" : "abandon"
899 /* Can clear pad variable in place? */
900 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
902 * if a my variable that was made readonly is going out of
903 * scope, we want to remove the readonlyness so that it can
904 * go out of scope quietly
906 if (SvPADMY(sv) && !SvFAKE(sv))
909 if (SvTHINKFIRST(sv))
910 sv_force_normal_flags(sv, SV_IMMEDIATE_UNREF);
914 switch (SvTYPE(sv)) {
918 av_clear(MUTABLE_AV(sv));
921 hv_clear(MUTABLE_HV(sv));
924 Perl_croak(aTHX_ "panic: leave_scope pad code");
929 SvPADSTALE_on(sv); /* mark as no longer live */
931 else { /* Someone has a claim on this, so abandon it. */
932 const U32 padflags = SvFLAGS(sv) & (SVs_PADMY|SVs_PADTMP);
933 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
934 case SVt_PVAV: *(SV**)ptr = MUTABLE_SV(newAV()); break;
935 case SVt_PVHV: *(SV**)ptr = MUTABLE_SV(newHV()); break;
936 default: *(SV**)ptr = newSV(0); break;
938 SvREFCNT_dec(sv); /* Cast current value to the winds. */
939 /* preserve pad nature, but also mark as not live
940 * for any closure capturing */
941 SvFLAGS(*(SV**)ptr) |= padflags | SVs_PADSTALE;
946 hv = MUTABLE_HV(ptr);
949 (void)hv_delete(hv, (char*)ptr, i, G_DISCARD);
955 av = MUTABLE_AV(ptr);
957 (void)av_delete(av, i, G_DISCARD);
960 case SAVEt_DESTRUCTOR_X:
962 (*SSPOPDXPTR)(aTHX_ ptr);
964 case SAVEt_REGCONTEXT:
965 /* regexp must have croaked */
967 PL_savestack_ix -= uv >> SAVE_TIGHT_SHIFT;
969 case SAVEt_STACK_POS: /* Position on Perl stack */
971 PL_stack_sp = PL_stack_base + i;
973 case SAVEt_STACK_CXPOS: /* blk_oldsp on context stack */
975 cxstack[i].blk_oldsp = SSPOPINT;
977 case SAVEt_AELEM: /* array element */
978 value = MUTABLE_SV(SSPOPPTR);
980 av = MUTABLE_AV(SSPOPPTR);
981 ptr = av_fetch(av,i,1);
982 if (!AvREAL(av) && AvREIFY(av)) /* undo reify guard */
986 if (sv && sv != &PL_sv_undef) {
987 if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied))
988 SvREFCNT_inc_void_NN(sv);
995 case SAVEt_HELEM: /* hash element */
996 value = MUTABLE_SV(SSPOPPTR);
997 sv = MUTABLE_SV(SSPOPPTR);
998 hv = MUTABLE_HV(SSPOPPTR);
999 ptr = hv_fetch_ent(hv, sv, 1, 0);
1002 const SV * const oval = HeVAL((HE*)ptr);
1003 if (oval && oval != &PL_sv_undef) {
1004 ptr = &HeVAL((HE*)ptr);
1005 if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1006 SvREFCNT_inc_void(*(SV**)ptr);
1007 av = MUTABLE_AV(hv); /* what to refcnt_dec */
1012 SvREFCNT_dec(value);
1015 PL_op = (OP*)SSPOPPTR;
1018 if ((PL_hints & HINT_LOCALIZE_HH) && GvHV(PL_hintgv)) {
1019 SvREFCNT_dec(MUTABLE_SV(GvHV(PL_hintgv)));
1020 GvHV(PL_hintgv) = NULL;
1022 Perl_refcounted_he_free(aTHX_ PL_compiling.cop_hints_hash);
1023 PL_compiling.cop_hints_hash = (struct refcounted_he *) SSPOPPTR;
1024 *(I32*)&PL_hints = (I32)SSPOPINT;
1025 if (PL_hints & HINT_LOCALIZE_HH) {
1026 SvREFCNT_dec(MUTABLE_SV(GvHV(PL_hintgv)));
1027 GvHV(PL_hintgv) = MUTABLE_HV(SSPOPPTR);
1028 assert(GvHV(PL_hintgv));
1029 } else if (!GvHV(PL_hintgv)) {
1030 /* Need to add a new one manually, else gv_fetchpv() can
1031 add one in this code:
1033 if (SvTYPE(gv) == SVt_PVGV) {
1036 gv_init_sv(gv, sv_type);
1037 if (*name=='!' && sv_type == SVt_PVHV && len==1)
1043 and it won't have the magic set. */
1045 HV *const hv = newHV();
1046 hv_magic(hv, NULL, PERL_MAGIC_hints);
1047 GvHV(PL_hintgv) = hv;
1049 assert(GvHV(PL_hintgv));
1052 PL_comppad = (PAD*)SSPOPPTR;
1054 PL_curpad = AvARRAY(PL_comppad);
1058 case SAVEt_PADSV_AND_MORTALIZE:
1060 const PADOFFSET off = (PADOFFSET)SSPOPLONG;
1064 svp = AvARRAY((PAD*)ptr) + off;
1065 /* This mortalizing used to be done by POPLOOP() via itersave.
1066 But as we have all the information here, we can do it here,
1067 save even having to have itersave in the struct. */
1069 *svp = MUTABLE_SV(SSPOPPTR);
1072 case SAVEt_SAVESWITCHSTACK:
1075 AV *const t = MUTABLE_AV(SSPOPPTR);
1076 AV *const f = MUTABLE_AV(SSPOPPTR);
1078 PL_curstackinfo->si_stack = f;
1081 case SAVEt_SET_SVFLAGS:
1083 const U32 val = (U32)SSPOPINT;
1084 const U32 mask = (U32)SSPOPINT;
1085 sv = MUTABLE_SV(SSPOPPTR);
1086 SvFLAGS(sv) &= ~mask;
1091 /* This would be a mathom, but Perl_save_svref() calls a static
1092 function, S_save_scalar_at(), so has to stay in this file. */
1093 case SAVEt_SVREF: /* scalar reference */
1094 value = MUTABLE_SV(SSPOPPTR);
1096 av = NULL; /* what to refcnt_dec */
1099 /* These are only saved in mathoms.c */
1101 gv = MUTABLE_GV(SSPOPPTR);
1102 (void)sv_clear(MUTABLE_SV(gv));
1104 case SAVEt_LONG: /* long reference */
1106 *(long*)ptr = (long)SSPOPLONG;
1108 case SAVEt_IV: /* IV reference */
1110 *(IV*)ptr = (IV)SSPOPIV;
1113 case SAVEt_I16: /* I16 reference */
1115 *(I16*)ptr = (I16)(uv >> 8);
1117 case SAVEt_I8: /* I8 reference */
1119 *(I8*)ptr = (I8)(uv >> 8);
1121 case SAVEt_DESTRUCTOR:
1125 case SAVEt_COP_ARYBASE:
1128 CopARYBASE_set((COP *)ptr, i);
1130 case SAVEt_COMPILE_WARNINGS:
1133 if (!specialWARN(PL_compiling.cop_warnings))
1134 PerlMemShared_free(PL_compiling.cop_warnings);
1136 PL_compiling.cop_warnings = (STRLEN*)ptr;
1138 case SAVEt_RE_STATE:
1140 const struct re_save_state *const state
1141 = (struct re_save_state *)
1142 (PL_savestack + PL_savestack_ix
1143 - SAVESTACK_ALLOC_FOR_RE_SAVE_STATE);
1144 PL_savestack_ix -= SAVESTACK_ALLOC_FOR_RE_SAVE_STATE;
1146 if (PL_reg_start_tmp != state->re_state_reg_start_tmp) {
1147 Safefree(PL_reg_start_tmp);
1149 if (PL_reg_poscache != state->re_state_reg_poscache) {
1150 Safefree(PL_reg_poscache);
1152 Copy(state, &PL_reg_state, 1, struct re_save_state);
1157 parser_free((yy_parser *) ptr);
1160 Perl_croak(aTHX_ "panic: leave_scope inconsistency");
1170 Perl_cx_dump(pTHX_ PERL_CONTEXT *cx)
1174 PERL_ARGS_ASSERT_CX_DUMP;
1177 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]);
1178 if (CxTYPE(cx) != CXt_SUBST) {
1179 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
1180 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%"UVxf"\n",
1181 PTR2UV(cx->blk_oldcop));
1182 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
1183 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
1184 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%"UVxf"\n",
1185 PTR2UV(cx->blk_oldpm));
1186 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
1188 switch (CxTYPE(cx)) {
1193 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.CV = 0x%"UVxf"\n",
1194 PTR2UV(cx->blk_format.cv));
1195 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.GV = 0x%"UVxf"\n",
1196 PTR2UV(cx->blk_format.gv));
1197 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.DFOUTGV = 0x%"UVxf"\n",
1198 PTR2UV(cx->blk_format.dfoutgv));
1199 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.HASARGS = %d\n",
1200 (int)CxHASARGS(cx));
1201 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.RETOP = 0x%"UVxf"\n",
1202 PTR2UV(cx->blk_format.retop));
1205 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%"UVxf"\n",
1206 PTR2UV(cx->blk_sub.cv));
1207 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
1208 (long)cx->blk_sub.olddepth);
1209 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
1210 (int)CxHASARGS(cx));
1211 PerlIO_printf(Perl_debug_log, "BLK_SUB.LVAL = %d\n", (int)CxLVAL(cx));
1212 PerlIO_printf(Perl_debug_log, "BLK_SUB.RETOP = 0x%"UVxf"\n",
1213 PTR2UV(cx->blk_sub.retop));
1216 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
1217 (long)CxOLD_IN_EVAL(cx));
1218 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
1219 PL_op_name[CxOLD_OP_TYPE(cx)],
1220 PL_op_desc[CxOLD_OP_TYPE(cx)]);
1221 if (cx->blk_eval.old_namesv)
1222 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
1223 SvPVX_const(cx->blk_eval.old_namesv));
1224 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%"UVxf"\n",
1225 PTR2UV(cx->blk_eval.old_eval_root));
1226 PerlIO_printf(Perl_debug_log, "BLK_EVAL.RETOP = 0x%"UVxf"\n",
1227 PTR2UV(cx->blk_eval.retop));
1230 case CXt_LOOP_LAZYIV:
1231 case CXt_LOOP_LAZYSV:
1233 case CXt_LOOP_PLAIN:
1234 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n", CxLABEL(cx));
1235 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
1236 (long)cx->blk_loop.resetsp);
1237 PerlIO_printf(Perl_debug_log, "BLK_LOOP.MY_OP = 0x%"UVxf"\n",
1238 PTR2UV(cx->blk_loop.my_op));
1239 /* XXX: not accurate for LAZYSV/IV */
1240 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%"UVxf"\n",
1241 PTR2UV(cx->blk_loop.state_u.ary.ary));
1242 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
1243 (long)cx->blk_loop.state_u.ary.ix);
1244 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%"UVxf"\n",
1245 PTR2UV(CxITERVAR(cx)));
1249 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
1250 (long)cx->sb_iters);
1251 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
1252 (long)cx->sb_maxiters);
1253 PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n",
1254 (long)cx->sb_rflags);
1255 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
1257 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
1259 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%"UVxf"\n",
1260 PTR2UV(cx->sb_dstr));
1261 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%"UVxf"\n",
1262 PTR2UV(cx->sb_targ));
1263 PerlIO_printf(Perl_debug_log, "SB_S = 0x%"UVxf"\n",
1265 PerlIO_printf(Perl_debug_log, "SB_M = 0x%"UVxf"\n",
1267 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%"UVxf"\n",
1268 PTR2UV(cx->sb_strend));
1269 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%"UVxf"\n",
1270 PTR2UV(cx->sb_rxres));
1274 PERL_UNUSED_CONTEXT;
1275 PERL_UNUSED_ARG(cx);
1276 #endif /* DEBUGGING */
1281 * c-indentation-style: bsd
1283 * indent-tabs-mode: t
1286 * ex: set ts=8 sts=4 sw=4 noet: