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--];
165 PoisonWith(PL_tmps_stack + PL_tmps_ix + 1, 1, SV *, 0xAB);
167 if (sv && sv != &PL_sv_undef) {
169 SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */
175 S_save_scalar_at(pTHX_ SV **sptr, const U32 flags)
181 PERL_ARGS_ASSERT_SAVE_SCALAR_AT;
184 sv = (flags & SAVEf_KEEPOLDELEM) ? osv : (*sptr = newSV(0));
186 if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv)) {
187 if (SvGMAGICAL(osv)) {
188 SvFLAGS(osv) |= (SvFLAGS(osv) &
189 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
191 if (!(flags & SAVEf_KEEPOLDELEM))
192 mg_localize(osv, sv, cBOOL(flags & SAVEf_SETMAGIC));
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;
284 save_pushptrptr(SvREFCNT_inc(gv), GvGP(gv), SAVEt_GP);
287 GP *gp = Perl_newGP(aTHX_ gv);
290 mro_method_changed_in(GvSTASH(gv)); /* taking a method out of circulation ("local")*/
291 if (GvIOp(gv) && (IoFLAGS(GvIOp(gv)) & IOf_ARGV)) {
293 IoFLAGS(gp->gp_io) |= IOf_ARGV|IOf_START;
295 #ifdef PERL_DONT_CREATE_GVSV
296 if (gv == PL_errgv) {
297 /* We could scatter this logic everywhere by changing the
298 definition of ERRSV from GvSV() to GvSVn(), but it seems more
299 efficient to do this check once here. */
300 gp->gp_sv = newSV(0);
312 Perl_save_ary(pTHX_ GV *gv)
315 AV * const oav = GvAVn(gv);
318 PERL_ARGS_ASSERT_SAVE_ARY;
320 if (!AvREAL(oav) && AvREIFY(oav))
322 save_pushptrptr(SvREFCNT_inc_simple_NN(gv), oav, SAVEt_AV);
327 mg_localize(MUTABLE_SV(oav), MUTABLE_SV(av), TRUE);
332 Perl_save_hash(pTHX_ GV *gv)
337 PERL_ARGS_ASSERT_SAVE_HASH;
340 SvREFCNT_inc_simple_NN(gv), (ohv = GvHVn(gv)), SAVEt_HV
346 mg_localize(MUTABLE_SV(ohv), MUTABLE_SV(hv), TRUE);
351 Perl_save_item(pTHX_ register SV *item)
354 SV * const sv = newSVsv(item);
356 PERL_ARGS_ASSERT_SAVE_ITEM;
358 save_pushptrptr(item, /* remember the pointer */
359 sv, /* remember the value */
364 Perl_save_bool(pTHX_ bool *boolp)
368 PERL_ARGS_ASSERT_SAVE_BOOL;
372 SSPUSHUV(SAVEt_BOOL | (*boolp << 8));
376 Perl_save_pushi32ptr(pTHX_ const I32 i, void *const ptr, const int type)
386 Perl_save_int(pTHX_ int *intp)
389 const UV shifted = (UV)*intp << SAVE_TIGHT_SHIFT;
391 PERL_ARGS_ASSERT_SAVE_INT;
393 if ((int)(shifted >> SAVE_TIGHT_SHIFT) == *intp) {
396 SSPUSHUV(SAVEt_INT_SMALL | shifted);
398 save_pushi32ptr(*intp, intp, SAVEt_INT);
402 Perl_save_I8(pTHX_ I8 *bytep)
406 PERL_ARGS_ASSERT_SAVE_I8;
410 SSPUSHUV(SAVEt_I8 | ((UV)*bytep << 8));
414 Perl_save_I16(pTHX_ I16 *intp)
418 PERL_ARGS_ASSERT_SAVE_I16;
422 SSPUSHUV(SAVEt_I16 | ((UV)*intp << 8));
426 Perl_save_I32(pTHX_ I32 *intp)
429 const UV shifted = (UV)*intp << SAVE_TIGHT_SHIFT;
431 PERL_ARGS_ASSERT_SAVE_I32;
433 if ((I32)(shifted >> SAVE_TIGHT_SHIFT) == *intp) {
436 SSPUSHUV(SAVEt_I32_SMALL | shifted);
438 save_pushi32ptr(*intp, intp, SAVEt_I32);
441 /* Cannot use save_sptr() to store a char* since the SV** cast will
442 * force word-alignment and we'll miss the pointer.
445 Perl_save_pptr(pTHX_ char **pptr)
449 PERL_ARGS_ASSERT_SAVE_PPTR;
451 save_pushptrptr(*pptr, pptr, SAVEt_PPTR);
455 Perl_save_vptr(pTHX_ void *ptr)
459 PERL_ARGS_ASSERT_SAVE_VPTR;
461 save_pushptrptr(*(char**)ptr, ptr, SAVEt_VPTR);
465 Perl_save_sptr(pTHX_ SV **sptr)
469 PERL_ARGS_ASSERT_SAVE_SPTR;
471 save_pushptrptr(*sptr, sptr, SAVEt_SPTR);
475 Perl_save_padsv_and_mortalize(pTHX_ PADOFFSET off)
479 ASSERT_CURPAD_ACTIVE("save_padsv");
480 SSPUSHPTR(SvREFCNT_inc_simple_NN(PL_curpad[off]));
481 SSPUSHPTR(PL_comppad);
482 SSPUSHLONG((long)off);
483 SSPUSHUV(SAVEt_PADSV_AND_MORTALIZE);
487 Perl_save_hptr(pTHX_ HV **hptr)
491 PERL_ARGS_ASSERT_SAVE_HPTR;
493 save_pushptrptr(*hptr, hptr, SAVEt_HPTR);
497 Perl_save_aptr(pTHX_ AV **aptr)
501 PERL_ARGS_ASSERT_SAVE_APTR;
503 save_pushptrptr(*aptr, aptr, SAVEt_APTR);
507 Perl_save_pushptr(pTHX_ void *const ptr, const int type)
516 Perl_save_clearsv(pTHX_ SV **svp)
519 const UV offset = svp - PL_curpad;
520 const UV offset_shifted = offset << SAVE_TIGHT_SHIFT;
522 PERL_ARGS_ASSERT_SAVE_CLEARSV;
524 ASSERT_CURPAD_ACTIVE("save_clearsv");
525 if ((offset_shifted >> SAVE_TIGHT_SHIFT) != offset)
526 Perl_croak(aTHX_ "panic: pad offset %"UVuf" out of range (%p-%p)",
527 offset, svp, PL_curpad);
530 SSPUSHUV(offset_shifted | SAVEt_CLEARSV);
531 SvPADSTALE_off(*svp); /* mark lexical as active */
535 Perl_save_delete(pTHX_ HV *hv, char *key, I32 klen)
539 PERL_ARGS_ASSERT_SAVE_DELETE;
541 save_pushptri32ptr(key, klen, SvREFCNT_inc_simple(hv), SAVEt_DELETE);
545 Perl_save_hdelete(pTHX_ HV *hv, SV *keysv)
551 PERL_ARGS_ASSERT_SAVE_HDELETE;
553 key = SvPV_const(keysv, len);
554 klen = SvUTF8(keysv) ? -(I32)len : (I32)len;
555 SvREFCNT_inc_simple_void_NN(hv);
556 save_pushptri32ptr(savepvn(key, len), klen, hv, SAVEt_DELETE);
560 Perl_save_adelete(pTHX_ AV *av, I32 key)
564 PERL_ARGS_ASSERT_SAVE_ADELETE;
566 SvREFCNT_inc_void(av);
567 save_pushi32ptr(key, av, SAVEt_ADELETE);
571 Perl_save_destructor(pTHX_ DESTRUCTORFUNC_NOCONTEXT_t f, void* p)
575 PERL_ARGS_ASSERT_SAVE_DESTRUCTOR;
580 SSPUSHUV(SAVEt_DESTRUCTOR);
584 Perl_save_destructor_x(pTHX_ DESTRUCTORFUNC_t f, void* p)
590 SSPUSHUV(SAVEt_DESTRUCTOR_X);
594 Perl_save_hints(pTHX)
597 COPHH *save_cophh = cophh_copy(CopHINTHASH_get(&PL_compiling));
598 if (PL_hints & HINT_LOCALIZE_HH) {
599 HV *oldhh = GvHV(PL_hintgv);
600 save_pushptri32ptr(oldhh, PL_hints, save_cophh, SAVEt_HINTS);
601 GvHV(PL_hintgv) = NULL; /* in case copying dies */
602 GvHV(PL_hintgv) = hv_copy_hints_hv(oldhh);
604 save_pushi32ptr(PL_hints, save_cophh, SAVEt_HINTS);
609 S_save_pushptri32ptr(pTHX_ void *const ptr1, const I32 i, void *const ptr2,
620 Perl_save_aelem_flags(pTHX_ AV *av, I32 idx, SV **sptr, const U32 flags)
625 PERL_ARGS_ASSERT_SAVE_AELEM_FLAGS;
628 save_pushptri32ptr(SvREFCNT_inc_simple(av), idx, SvREFCNT_inc(*sptr),
630 /* if it gets reified later, the restore will have the wrong refcnt */
631 if (!AvREAL(av) && AvREIFY(av))
632 SvREFCNT_inc_void(*sptr);
633 save_scalar_at(sptr, flags); /* XXX - FIXME - see #60360 */
634 if (flags & SAVEf_KEEPOLDELEM)
637 /* If we're localizing a tied array element, this new sv
638 * won't actually be stored in the array - so it won't get
639 * reaped when the localize ends. Ensure it gets reaped by
640 * mortifying it instead. DAPM */
641 if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied))
646 Perl_save_helem_flags(pTHX_ HV *hv, SV *key, SV **sptr, const U32 flags)
651 PERL_ARGS_ASSERT_SAVE_HELEM_FLAGS;
655 SSPUSHPTR(SvREFCNT_inc_simple(hv));
656 SSPUSHPTR(newSVsv(key));
657 SSPUSHPTR(SvREFCNT_inc(*sptr));
658 SSPUSHUV(SAVEt_HELEM);
659 save_scalar_at(sptr, flags);
660 if (flags & SAVEf_KEEPOLDELEM)
663 /* If we're localizing a tied hash element, this new sv
664 * won't actually be stored in the hash - so it won't get
665 * reaped when the localize ends. Ensure it gets reaped by
666 * mortifying it instead. DAPM */
667 if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
672 Perl_save_svref(pTHX_ SV **sptr)
676 PERL_ARGS_ASSERT_SAVE_SVREF;
679 save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_SVREF);
680 return save_scalar_at(sptr, SAVEf_SETMAGIC); /* XXX - FIXME - see #60360 */
684 Perl_save_alloc(pTHX_ I32 size, I32 pad)
687 const I32 start = pad + ((char*)&PL_savestack[PL_savestack_ix]
688 - (char*)PL_savestack);
689 const UV elems = 1 + ((size + pad - 1) / sizeof(*PL_savestack));
690 const UV elems_shifted = elems << SAVE_TIGHT_SHIFT;
692 if ((elems_shifted >> SAVE_TIGHT_SHIFT) != elems)
693 Perl_croak(aTHX_ "panic: save_alloc elems %"UVuf" out of range (%ld-%ld)",
698 PL_savestack_ix += elems;
699 SSPUSHUV(SAVEt_ALLOC | elems_shifted);
704 Perl_leave_scope(pTHX_ I32 base)
715 /* Localise the effects of the TAINT_NOT inside the loop. */
716 bool was = PL_tainted;
719 Perl_croak(aTHX_ "panic: corrupt saved stack index %ld", (long) base);
720 DEBUG_l(Perl_deb(aTHX_ "savestack: releasing items %ld -> %ld\n",
721 (long)PL_savestack_ix, (long)base));
722 while (PL_savestack_ix > base) {
724 const U8 type = (U8)uv & SAVE_MASK;
728 case SAVEt_ITEM: /* normal string */
729 value = MUTABLE_SV(SSPOPPTR);
730 sv = MUTABLE_SV(SSPOPPTR);
731 sv_replace(sv,value);
736 case SAVEt_SV: /* scalar reference */
737 value = MUTABLE_SV(SSPOPPTR);
738 gv = MUTABLE_GV(SSPOPPTR);
740 av = MUTABLE_AV(gv); /* what to refcnt_dec */
749 SvREFCNT_dec(av); /* av may actually be an AV, HV or GV */
751 case SAVEt_GENERIC_PVREF: /* generic pv */
753 str = (char*)SSPOPPTR;
754 if (*(char**)ptr != str) {
755 Safefree(*(char**)ptr);
759 case SAVEt_SHARED_PVREF: /* shared pv */
760 str = (char*)SSPOPPTR;
762 if (*(char**)ptr != str) {
764 PerlMem_free(*(char**)ptr);
766 PerlMemShared_free(*(char**)ptr);
771 case SAVEt_GVSV: /* scalar slot in GV */
772 value = MUTABLE_SV(SSPOPPTR);
773 gv = MUTABLE_GV(SSPOPPTR);
776 case SAVEt_GENERIC_SVREF: /* generic sv */
777 value = MUTABLE_SV(SSPOPPTR);
785 case SAVEt_AV: /* array reference */
786 av = MUTABLE_AV(SSPOPPTR);
787 gv = MUTABLE_GV(SSPOPPTR);
788 SvREFCNT_dec(GvAV(gv));
792 SvSETMAGIC(MUTABLE_SV(av));
797 case SAVEt_HV: /* hash reference */
798 hv = MUTABLE_HV(SSPOPPTR);
799 gv = MUTABLE_GV(SSPOPPTR);
800 SvREFCNT_dec(GvHV(gv));
804 SvSETMAGIC(MUTABLE_SV(hv));
809 case SAVEt_INT_SMALL:
811 *(int*)ptr = (int)(uv >> SAVE_TIGHT_SHIFT);
813 case SAVEt_INT: /* int reference */
815 *(int*)ptr = (int)SSPOPINT;
817 case SAVEt_BOOL: /* bool reference */
819 *(bool*)ptr = cBOOL(uv >> 8);
821 if (ptr == &PL_tainted) {
822 /* If we don't update <was>, to reflect what was saved on the
823 * stack for PL_tainted, then we will overwrite this attempt to
824 * restore it when we exit this routine. Note that this won't
825 * work if this value was saved in a wider-than necessary type,
830 case SAVEt_I32_SMALL:
832 *(I32*)ptr = (I32)(uv >> SAVE_TIGHT_SHIFT);
834 case SAVEt_I32: /* I32 reference */
836 #ifdef PERL_DEBUG_READONLY_OPS
838 const I32 val = SSPOPINT;
839 if (*(I32*)ptr != val)
843 *(I32*)ptr = (I32)SSPOPINT;
846 case SAVEt_SPTR: /* SV* reference */
848 *(SV**)ptr = MUTABLE_SV(SSPOPPTR);
850 case SAVEt_VPTR: /* random* reference */
851 case SAVEt_PPTR: /* char* reference */
853 *(char**)ptr = (char*)SSPOPPTR;
855 case SAVEt_HPTR: /* HV* reference */
857 *(HV**)ptr = MUTABLE_HV(SSPOPPTR);
859 case SAVEt_APTR: /* AV* reference */
861 *(AV**)ptr = MUTABLE_AV(SSPOPPTR);
863 case SAVEt_GP: /* scalar reference */
865 gv = MUTABLE_GV(SSPOPPTR);
867 GvGP_set(gv, (GP*)ptr);
868 /* putting a method back into circulation ("local")*/
869 if (GvCVu(gv) && (hv=GvSTASH(gv)) && HvENAME_get(hv))
870 mro_method_changed_in(hv);
875 SvREFCNT_dec(MUTABLE_SV(ptr));
877 case SAVEt_FREECOPHH:
879 cophh_free((COPHH *)ptr);
881 case SAVEt_MORTALIZESV:
883 sv_2mortal(MUTABLE_SV(ptr));
887 ASSERT_CURPAD_LEGAL("SAVEt_FREEOP"); /* XXX DAPM tmp */
895 ptr = (void*)&PL_curpad[uv >> SAVE_TIGHT_SHIFT];
898 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
899 "Pad 0x%"UVxf"[0x%"UVxf"] clearsv: %ld sv=0x%"UVxf"<%"IVdf"> %s\n",
900 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
901 (long)((SV **)ptr-PL_curpad), PTR2UV(sv), (IV)SvREFCNT(sv),
902 (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) ? "clear" : "abandon"
905 /* Can clear pad variable in place? */
906 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
908 * if a my variable that was made readonly is going out of
909 * scope, we want to remove the readonlyness so that it can
910 * go out of scope quietly
912 if (SvPADMY(sv) && !SvFAKE(sv))
915 if (SvTHINKFIRST(sv))
916 sv_force_normal_flags(sv, SV_IMMEDIATE_UNREF
918 if (SvTYPE(sv) == SVt_PVHV)
919 Perl_hv_kill_backrefs(aTHX_ MUTABLE_HV(sv));
922 sv_unmagic(sv, PERL_MAGIC_backref);
923 if (SvTYPE(sv) != SVt_PVCV)
927 switch (SvTYPE(sv)) {
931 av_clear(MUTABLE_AV(sv));
934 hv_clear(MUTABLE_HV(sv));
938 HEK * const hek = CvNAME_HEK((CV *)sv);
942 CvNAME_HEK_set(sv, hek);
949 SvPADSTALE_on(sv); /* mark as no longer live */
951 else { /* Someone has a claim on this, so abandon it. */
952 assert( SvFLAGS(sv) & SVs_PADMY);
953 assert(!(SvFLAGS(sv) & SVs_PADTMP));
954 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
955 case SVt_PVAV: *(SV**)ptr = MUTABLE_SV(newAV()); break;
956 case SVt_PVHV: *(SV**)ptr = MUTABLE_SV(newHV()); break;
959 SV ** const svp = (SV **)ptr;
962 *svp = newSV_type(SVt_PVCV);
967 share_hek_hek(CvNAME_HEK((CV *)sv)));
970 default: *(SV**)ptr = newSV(0); break;
972 SvREFCNT_dec(sv); /* Cast current value to the winds. */
973 /* preserve pad nature, but also mark as not live
974 * for any closure capturing */
975 SvFLAGS(*(SV**)ptr) |= (SVs_PADMY|SVs_PADSTALE);
980 hv = MUTABLE_HV(ptr);
983 (void)hv_delete(hv, (char*)ptr, i, G_DISCARD);
989 av = MUTABLE_AV(ptr);
991 (void)av_delete(av, i, G_DISCARD);
994 case SAVEt_DESTRUCTOR_X:
996 (*SSPOPDXPTR)(aTHX_ ptr);
998 case SAVEt_REGCONTEXT:
999 /* regexp must have croaked */
1001 PL_savestack_ix -= uv >> SAVE_TIGHT_SHIFT;
1003 case SAVEt_STACK_POS: /* Position on Perl stack */
1005 PL_stack_sp = PL_stack_base + i;
1007 case SAVEt_STACK_CXPOS: /* blk_oldsp on context stack */
1009 cxstack[i].blk_oldsp = SSPOPINT;
1011 case SAVEt_AELEM: /* array element */
1012 value = MUTABLE_SV(SSPOPPTR);
1014 av = MUTABLE_AV(SSPOPPTR);
1015 ptr = av_fetch(av,i,1);
1016 if (!AvREAL(av) && AvREIFY(av)) /* undo reify guard */
1017 SvREFCNT_dec(value);
1020 if (sv && sv != &PL_sv_undef) {
1021 if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied))
1022 SvREFCNT_inc_void_NN(sv);
1027 SvREFCNT_dec(value);
1029 case SAVEt_HELEM: /* hash element */
1030 value = MUTABLE_SV(SSPOPPTR);
1031 sv = MUTABLE_SV(SSPOPPTR);
1032 hv = MUTABLE_HV(SSPOPPTR);
1033 ptr = hv_fetch_ent(hv, sv, 1, 0);
1036 const SV * const oval = HeVAL((HE*)ptr);
1037 if (oval && oval != &PL_sv_undef) {
1038 ptr = &HeVAL((HE*)ptr);
1039 if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1040 SvREFCNT_inc_void(*(SV**)ptr);
1041 av = MUTABLE_AV(hv); /* what to refcnt_dec */
1046 SvREFCNT_dec(value);
1049 PL_op = (OP*)SSPOPPTR;
1052 if ((PL_hints & HINT_LOCALIZE_HH)) {
1053 while (GvHV(PL_hintgv)) {
1054 HV *hv = GvHV(PL_hintgv);
1055 GvHV(PL_hintgv) = NULL;
1056 SvREFCNT_dec(MUTABLE_SV(hv));
1059 cophh_free(CopHINTHASH_get(&PL_compiling));
1060 CopHINTHASH_set(&PL_compiling, (COPHH*)SSPOPPTR);
1061 *(I32*)&PL_hints = (I32)SSPOPINT;
1062 if (PL_hints & HINT_LOCALIZE_HH) {
1063 SvREFCNT_dec(MUTABLE_SV(GvHV(PL_hintgv)));
1064 GvHV(PL_hintgv) = MUTABLE_HV(SSPOPPTR);
1066 if (!GvHV(PL_hintgv)) {
1067 /* Need to add a new one manually, else rv2hv can
1068 add one via GvHVn and it won't have the magic set. */
1069 HV *const hv = newHV();
1070 hv_magic(hv, NULL, PERL_MAGIC_hints);
1071 GvHV(PL_hintgv) = hv;
1073 assert(GvHV(PL_hintgv));
1076 PL_comppad = (PAD*)SSPOPPTR;
1078 PL_curpad = AvARRAY(PL_comppad);
1082 case SAVEt_PADSV_AND_MORTALIZE:
1084 const PADOFFSET off = (PADOFFSET)SSPOPLONG;
1088 svp = AvARRAY((PAD*)ptr) + off;
1089 /* This mortalizing used to be done by POPLOOP() via itersave.
1090 But as we have all the information here, we can do it here,
1091 save even having to have itersave in the struct. */
1093 *svp = MUTABLE_SV(SSPOPPTR);
1096 case SAVEt_SAVESWITCHSTACK:
1099 AV *const t = MUTABLE_AV(SSPOPPTR);
1100 AV *const f = MUTABLE_AV(SSPOPPTR);
1102 PL_curstackinfo->si_stack = f;
1105 case SAVEt_SET_SVFLAGS:
1107 const U32 val = (U32)SSPOPINT;
1108 const U32 mask = (U32)SSPOPINT;
1109 sv = MUTABLE_SV(SSPOPPTR);
1110 SvFLAGS(sv) &= ~mask;
1115 /* This would be a mathom, but Perl_save_svref() calls a static
1116 function, S_save_scalar_at(), so has to stay in this file. */
1117 case SAVEt_SVREF: /* scalar reference */
1118 value = MUTABLE_SV(SSPOPPTR);
1120 av = NULL; /* what to refcnt_dec */
1123 /* These are only saved in mathoms.c */
1125 gv = MUTABLE_GV(SSPOPPTR);
1126 (void)sv_clear(MUTABLE_SV(gv));
1128 case SAVEt_LONG: /* long reference */
1130 *(long*)ptr = (long)SSPOPLONG;
1132 case SAVEt_IV: /* IV reference */
1134 *(IV*)ptr = (IV)SSPOPIV;
1137 case SAVEt_I16: /* I16 reference */
1139 *(I16*)ptr = (I16)(uv >> 8);
1141 case SAVEt_I8: /* I8 reference */
1143 *(I8*)ptr = (I8)(uv >> 8);
1145 case SAVEt_DESTRUCTOR:
1149 case SAVEt_COMPILE_WARNINGS:
1152 if (!specialWARN(PL_compiling.cop_warnings))
1153 PerlMemShared_free(PL_compiling.cop_warnings);
1155 PL_compiling.cop_warnings = (STRLEN*)ptr;
1157 case SAVEt_RE_STATE:
1159 const struct re_save_state *const state
1160 = (struct re_save_state *)
1161 (PL_savestack + PL_savestack_ix
1162 - SAVESTACK_ALLOC_FOR_RE_SAVE_STATE);
1163 PL_savestack_ix -= SAVESTACK_ALLOC_FOR_RE_SAVE_STATE;
1165 if (PL_reg_poscache != state->re_state_reg_poscache) {
1166 Safefree(PL_reg_poscache);
1168 Copy(state, &PL_reg_state, 1, struct re_save_state);
1173 parser_free((yy_parser *) ptr);
1176 Perl_croak(aTHX_ "panic: leave_scope inconsistency %u", type);
1186 Perl_cx_dump(pTHX_ PERL_CONTEXT *cx)
1190 PERL_ARGS_ASSERT_CX_DUMP;
1193 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]);
1194 if (CxTYPE(cx) != CXt_SUBST) {
1195 const char *gimme_text;
1196 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
1197 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%"UVxf"\n",
1198 PTR2UV(cx->blk_oldcop));
1199 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
1200 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
1201 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%"UVxf"\n",
1202 PTR2UV(cx->blk_oldpm));
1203 switch (cx->blk_gimme) {
1205 gimme_text = "VOID";
1208 gimme_text = "SCALAR";
1211 gimme_text = "LIST";
1214 gimme_text = "UNKNOWN";
1217 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", gimme_text);
1219 switch (CxTYPE(cx)) {
1224 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.CV = 0x%"UVxf"\n",
1225 PTR2UV(cx->blk_format.cv));
1226 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.GV = 0x%"UVxf"\n",
1227 PTR2UV(cx->blk_format.gv));
1228 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.DFOUTGV = 0x%"UVxf"\n",
1229 PTR2UV(cx->blk_format.dfoutgv));
1230 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.HASARGS = %d\n",
1231 (int)CxHASARGS(cx));
1232 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.RETOP = 0x%"UVxf"\n",
1233 PTR2UV(cx->blk_format.retop));
1236 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%"UVxf"\n",
1237 PTR2UV(cx->blk_sub.cv));
1238 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
1239 (long)cx->blk_sub.olddepth);
1240 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
1241 (int)CxHASARGS(cx));
1242 PerlIO_printf(Perl_debug_log, "BLK_SUB.LVAL = %d\n", (int)CxLVAL(cx));
1243 PerlIO_printf(Perl_debug_log, "BLK_SUB.RETOP = 0x%"UVxf"\n",
1244 PTR2UV(cx->blk_sub.retop));
1247 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
1248 (long)CxOLD_IN_EVAL(cx));
1249 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
1250 PL_op_name[CxOLD_OP_TYPE(cx)],
1251 PL_op_desc[CxOLD_OP_TYPE(cx)]);
1252 if (cx->blk_eval.old_namesv)
1253 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
1254 SvPVX_const(cx->blk_eval.old_namesv));
1255 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%"UVxf"\n",
1256 PTR2UV(cx->blk_eval.old_eval_root));
1257 PerlIO_printf(Perl_debug_log, "BLK_EVAL.RETOP = 0x%"UVxf"\n",
1258 PTR2UV(cx->blk_eval.retop));
1261 case CXt_LOOP_LAZYIV:
1262 case CXt_LOOP_LAZYSV:
1264 case CXt_LOOP_PLAIN:
1265 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n", CxLABEL(cx));
1266 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
1267 (long)cx->blk_loop.resetsp);
1268 PerlIO_printf(Perl_debug_log, "BLK_LOOP.MY_OP = 0x%"UVxf"\n",
1269 PTR2UV(cx->blk_loop.my_op));
1270 /* XXX: not accurate for LAZYSV/IV */
1271 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%"UVxf"\n",
1272 PTR2UV(cx->blk_loop.state_u.ary.ary));
1273 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
1274 (long)cx->blk_loop.state_u.ary.ix);
1275 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%"UVxf"\n",
1276 PTR2UV(CxITERVAR(cx)));
1280 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
1281 (long)cx->sb_iters);
1282 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
1283 (long)cx->sb_maxiters);
1284 PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n",
1285 (long)cx->sb_rflags);
1286 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
1288 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
1290 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%"UVxf"\n",
1291 PTR2UV(cx->sb_dstr));
1292 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%"UVxf"\n",
1293 PTR2UV(cx->sb_targ));
1294 PerlIO_printf(Perl_debug_log, "SB_S = 0x%"UVxf"\n",
1296 PerlIO_printf(Perl_debug_log, "SB_M = 0x%"UVxf"\n",
1298 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%"UVxf"\n",
1299 PTR2UV(cx->sb_strend));
1300 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%"UVxf"\n",
1301 PTR2UV(cx->sb_rxres));
1305 PERL_UNUSED_CONTEXT;
1306 PERL_UNUSED_ARG(cx);
1307 #endif /* DEBUGGING */
1312 * c-indentation-style: bsd
1314 * indent-tabs-mode: nil
1317 * ex: set ts=8 sts=4 sw=4 et: