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 = TAINT_get;
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);
820 #if !NO_TAINT_SUPPORT
821 if (ptr == &(TAINT_get)) {
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,
831 case SAVEt_I32_SMALL:
833 *(I32*)ptr = (I32)(uv >> SAVE_TIGHT_SHIFT);
835 case SAVEt_I32: /* I32 reference */
837 #ifdef PERL_DEBUG_READONLY_OPS
839 const I32 val = SSPOPINT;
840 if (*(I32*)ptr != val)
844 *(I32*)ptr = (I32)SSPOPINT;
847 case SAVEt_SPTR: /* SV* reference */
849 *(SV**)ptr = MUTABLE_SV(SSPOPPTR);
851 case SAVEt_VPTR: /* random* reference */
852 case SAVEt_PPTR: /* char* reference */
854 *(char**)ptr = (char*)SSPOPPTR;
856 case SAVEt_HPTR: /* HV* reference */
858 *(HV**)ptr = MUTABLE_HV(SSPOPPTR);
860 case SAVEt_APTR: /* AV* reference */
862 *(AV**)ptr = MUTABLE_AV(SSPOPPTR);
864 case SAVEt_GP: /* scalar reference */
866 gv = MUTABLE_GV(SSPOPPTR);
868 GvGP_set(gv, (GP*)ptr);
869 /* putting a method back into circulation ("local")*/
870 if (GvCVu(gv) && (hv=GvSTASH(gv)) && HvENAME_get(hv))
871 mro_method_changed_in(hv);
876 SvREFCNT_dec(MUTABLE_SV(ptr));
878 case SAVEt_FREECOPHH:
880 cophh_free((COPHH *)ptr);
882 case SAVEt_MORTALIZESV:
884 sv_2mortal(MUTABLE_SV(ptr));
888 ASSERT_CURPAD_LEGAL("SAVEt_FREEOP"); /* XXX DAPM tmp */
898 case SAVEt_CLEARPADRANGE:
899 i = (I32)((uv >> SAVE_TIGHT_SHIFT) & OPpPADRANGE_COUNTMASK);
900 svp = &PL_curpad[uv >>
901 (OPpPADRANGE_COUNTSHIFT + SAVE_TIGHT_SHIFT)] + i - 1;
904 svp = &PL_curpad[uv >> SAVE_TIGHT_SHIFT];
907 for (; i; i--, svp--) {
910 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
911 "Pad 0x%"UVxf"[0x%"UVxf"] clearsv: %ld sv=0x%"UVxf"<%"IVdf"> %s\n",
912 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
913 (long)(svp-PL_curpad), PTR2UV(sv), (IV)SvREFCNT(sv),
914 (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) ? "clear" : "abandon"
917 /* Can clear pad variable in place? */
918 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
920 * if a my variable that was made readonly is going out of
921 * scope, we want to remove the readonlyness so that it can
922 * go out of scope quietly
924 if (SvPADMY(sv) && !SvFAKE(sv))
927 if (SvTHINKFIRST(sv))
928 sv_force_normal_flags(sv, SV_IMMEDIATE_UNREF
930 if (SvTYPE(sv) == SVt_PVHV)
931 Perl_hv_kill_backrefs(aTHX_ MUTABLE_HV(sv));
934 sv_unmagic(sv, PERL_MAGIC_backref);
935 if (SvTYPE(sv) != SVt_PVCV)
939 switch (SvTYPE(sv)) {
943 av_clear(MUTABLE_AV(sv));
946 hv_clear(MUTABLE_HV(sv));
950 HEK * const hek = CvNAME_HEK((CV *)sv);
954 CvNAME_HEK_set(sv, hek);
961 SvPADSTALE_on(sv); /* mark as no longer live */
963 else { /* Someone has a claim on this, so abandon it. */
964 assert( SvFLAGS(sv) & SVs_PADMY);
965 assert(!(SvFLAGS(sv) & SVs_PADTMP));
966 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
967 case SVt_PVAV: *svp = MUTABLE_SV(newAV()); break;
968 case SVt_PVHV: *svp = MUTABLE_SV(newHV()); break;
972 *svp = newSV_type(SVt_PVCV);
977 share_hek_hek(CvNAME_HEK((CV *)sv)));
980 default: *svp = newSV(0); break;
982 SvREFCNT_dec(sv); /* Cast current value to the winds. */
983 /* preserve pad nature, but also mark as not live
984 * for any closure capturing */
985 SvFLAGS(*svp) |= (SVs_PADMY|SVs_PADSTALE);
992 hv = MUTABLE_HV(ptr);
995 (void)hv_delete(hv, (char*)ptr, i, G_DISCARD);
1001 av = MUTABLE_AV(ptr);
1003 (void)av_delete(av, i, G_DISCARD);
1006 case SAVEt_DESTRUCTOR_X:
1008 (*SSPOPDXPTR)(aTHX_ ptr);
1010 case SAVEt_REGCONTEXT:
1011 /* regexp must have croaked */
1013 PL_savestack_ix -= uv >> SAVE_TIGHT_SHIFT;
1015 case SAVEt_STACK_POS: /* Position on Perl stack */
1017 PL_stack_sp = PL_stack_base + i;
1019 case SAVEt_STACK_CXPOS: /* blk_oldsp on context stack */
1021 cxstack[i].blk_oldsp = SSPOPINT;
1023 case SAVEt_AELEM: /* array element */
1024 value = MUTABLE_SV(SSPOPPTR);
1026 av = MUTABLE_AV(SSPOPPTR);
1027 ptr = av_fetch(av,i,1);
1028 if (!AvREAL(av) && AvREIFY(av)) /* undo reify guard */
1029 SvREFCNT_dec(value);
1032 if (sv && sv != &PL_sv_undef) {
1033 if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied))
1034 SvREFCNT_inc_void_NN(sv);
1039 SvREFCNT_dec(value);
1041 case SAVEt_HELEM: /* hash element */
1042 value = MUTABLE_SV(SSPOPPTR);
1043 sv = MUTABLE_SV(SSPOPPTR);
1044 hv = MUTABLE_HV(SSPOPPTR);
1045 ptr = hv_fetch_ent(hv, sv, 1, 0);
1048 const SV * const oval = HeVAL((HE*)ptr);
1049 if (oval && oval != &PL_sv_undef) {
1050 ptr = &HeVAL((HE*)ptr);
1051 if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1052 SvREFCNT_inc_void(*(SV**)ptr);
1053 av = MUTABLE_AV(hv); /* what to refcnt_dec */
1058 SvREFCNT_dec(value);
1061 PL_op = (OP*)SSPOPPTR;
1064 if ((PL_hints & HINT_LOCALIZE_HH)) {
1065 while (GvHV(PL_hintgv)) {
1066 HV *hv = GvHV(PL_hintgv);
1067 GvHV(PL_hintgv) = NULL;
1068 SvREFCNT_dec(MUTABLE_SV(hv));
1071 cophh_free(CopHINTHASH_get(&PL_compiling));
1072 CopHINTHASH_set(&PL_compiling, (COPHH*)SSPOPPTR);
1073 *(I32*)&PL_hints = (I32)SSPOPINT;
1074 if (PL_hints & HINT_LOCALIZE_HH) {
1075 SvREFCNT_dec(MUTABLE_SV(GvHV(PL_hintgv)));
1076 GvHV(PL_hintgv) = MUTABLE_HV(SSPOPPTR);
1078 if (!GvHV(PL_hintgv)) {
1079 /* Need to add a new one manually, else rv2hv can
1080 add one via GvHVn and it won't have the magic set. */
1081 HV *const hv = newHV();
1082 hv_magic(hv, NULL, PERL_MAGIC_hints);
1083 GvHV(PL_hintgv) = hv;
1085 assert(GvHV(PL_hintgv));
1088 PL_comppad = (PAD*)SSPOPPTR;
1090 PL_curpad = AvARRAY(PL_comppad);
1094 case SAVEt_PADSV_AND_MORTALIZE:
1096 const PADOFFSET off = (PADOFFSET)SSPOPLONG;
1100 svp = AvARRAY((PAD*)ptr) + off;
1101 /* This mortalizing used to be done by POPLOOP() via itersave.
1102 But as we have all the information here, we can do it here,
1103 save even having to have itersave in the struct. */
1105 *svp = MUTABLE_SV(SSPOPPTR);
1108 case SAVEt_SAVESWITCHSTACK:
1111 AV *const t = MUTABLE_AV(SSPOPPTR);
1112 AV *const f = MUTABLE_AV(SSPOPPTR);
1114 PL_curstackinfo->si_stack = f;
1117 case SAVEt_SET_SVFLAGS:
1119 const U32 val = (U32)SSPOPINT;
1120 const U32 mask = (U32)SSPOPINT;
1121 sv = MUTABLE_SV(SSPOPPTR);
1122 SvFLAGS(sv) &= ~mask;
1127 /* This would be a mathom, but Perl_save_svref() calls a static
1128 function, S_save_scalar_at(), so has to stay in this file. */
1129 case SAVEt_SVREF: /* scalar reference */
1130 value = MUTABLE_SV(SSPOPPTR);
1132 av = NULL; /* what to refcnt_dec */
1135 /* These are only saved in mathoms.c */
1137 gv = MUTABLE_GV(SSPOPPTR);
1138 (void)sv_clear(MUTABLE_SV(gv));
1140 case SAVEt_LONG: /* long reference */
1142 *(long*)ptr = (long)SSPOPLONG;
1144 case SAVEt_IV: /* IV reference */
1146 *(IV*)ptr = (IV)SSPOPIV;
1149 case SAVEt_I16: /* I16 reference */
1151 *(I16*)ptr = (I16)(uv >> 8);
1153 case SAVEt_I8: /* I8 reference */
1155 *(I8*)ptr = (I8)(uv >> 8);
1157 case SAVEt_DESTRUCTOR:
1161 case SAVEt_COMPILE_WARNINGS:
1164 if (!specialWARN(PL_compiling.cop_warnings))
1165 PerlMemShared_free(PL_compiling.cop_warnings);
1167 PL_compiling.cop_warnings = (STRLEN*)ptr;
1169 case SAVEt_RE_STATE:
1171 const struct re_save_state *const state
1172 = (struct re_save_state *)
1173 (PL_savestack + PL_savestack_ix
1174 - SAVESTACK_ALLOC_FOR_RE_SAVE_STATE);
1175 PL_savestack_ix -= SAVESTACK_ALLOC_FOR_RE_SAVE_STATE;
1177 if (PL_reg_poscache != state->re_state_reg_poscache) {
1178 Safefree(PL_reg_poscache);
1180 Copy(state, &PL_reg_state, 1, struct re_save_state);
1185 parser_free((yy_parser *) ptr);
1188 Perl_croak(aTHX_ "panic: leave_scope inconsistency %u", type);
1198 Perl_cx_dump(pTHX_ PERL_CONTEXT *cx)
1202 PERL_ARGS_ASSERT_CX_DUMP;
1205 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]);
1206 if (CxTYPE(cx) != CXt_SUBST) {
1207 const char *gimme_text;
1208 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
1209 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%"UVxf"\n",
1210 PTR2UV(cx->blk_oldcop));
1211 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
1212 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
1213 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%"UVxf"\n",
1214 PTR2UV(cx->blk_oldpm));
1215 switch (cx->blk_gimme) {
1217 gimme_text = "VOID";
1220 gimme_text = "SCALAR";
1223 gimme_text = "LIST";
1226 gimme_text = "UNKNOWN";
1229 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", gimme_text);
1231 switch (CxTYPE(cx)) {
1236 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.CV = 0x%"UVxf"\n",
1237 PTR2UV(cx->blk_format.cv));
1238 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.GV = 0x%"UVxf"\n",
1239 PTR2UV(cx->blk_format.gv));
1240 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.DFOUTGV = 0x%"UVxf"\n",
1241 PTR2UV(cx->blk_format.dfoutgv));
1242 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.HASARGS = %d\n",
1243 (int)CxHASARGS(cx));
1244 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.RETOP = 0x%"UVxf"\n",
1245 PTR2UV(cx->blk_format.retop));
1248 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%"UVxf"\n",
1249 PTR2UV(cx->blk_sub.cv));
1250 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
1251 (long)cx->blk_sub.olddepth);
1252 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
1253 (int)CxHASARGS(cx));
1254 PerlIO_printf(Perl_debug_log, "BLK_SUB.LVAL = %d\n", (int)CxLVAL(cx));
1255 PerlIO_printf(Perl_debug_log, "BLK_SUB.RETOP = 0x%"UVxf"\n",
1256 PTR2UV(cx->blk_sub.retop));
1259 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
1260 (long)CxOLD_IN_EVAL(cx));
1261 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
1262 PL_op_name[CxOLD_OP_TYPE(cx)],
1263 PL_op_desc[CxOLD_OP_TYPE(cx)]);
1264 if (cx->blk_eval.old_namesv)
1265 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
1266 SvPVX_const(cx->blk_eval.old_namesv));
1267 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%"UVxf"\n",
1268 PTR2UV(cx->blk_eval.old_eval_root));
1269 PerlIO_printf(Perl_debug_log, "BLK_EVAL.RETOP = 0x%"UVxf"\n",
1270 PTR2UV(cx->blk_eval.retop));
1273 case CXt_LOOP_LAZYIV:
1274 case CXt_LOOP_LAZYSV:
1276 case CXt_LOOP_PLAIN:
1277 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n", CxLABEL(cx));
1278 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
1279 (long)cx->blk_loop.resetsp);
1280 PerlIO_printf(Perl_debug_log, "BLK_LOOP.MY_OP = 0x%"UVxf"\n",
1281 PTR2UV(cx->blk_loop.my_op));
1282 /* XXX: not accurate for LAZYSV/IV */
1283 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%"UVxf"\n",
1284 PTR2UV(cx->blk_loop.state_u.ary.ary));
1285 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
1286 (long)cx->blk_loop.state_u.ary.ix);
1287 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%"UVxf"\n",
1288 PTR2UV(CxITERVAR(cx)));
1292 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
1293 (long)cx->sb_iters);
1294 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
1295 (long)cx->sb_maxiters);
1296 PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n",
1297 (long)cx->sb_rflags);
1298 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
1300 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
1302 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%"UVxf"\n",
1303 PTR2UV(cx->sb_dstr));
1304 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%"UVxf"\n",
1305 PTR2UV(cx->sb_targ));
1306 PerlIO_printf(Perl_debug_log, "SB_S = 0x%"UVxf"\n",
1308 PerlIO_printf(Perl_debug_log, "SB_M = 0x%"UVxf"\n",
1310 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%"UVxf"\n",
1311 PTR2UV(cx->sb_strend));
1312 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%"UVxf"\n",
1313 PTR2UV(cx->sb_rxres));
1317 PERL_UNUSED_CONTEXT;
1318 PERL_UNUSED_ARG(cx);
1319 #endif /* DEBUGGING */
1324 * c-indentation-style: bsd
1326 * indent-tabs-mode: nil
1329 * ex: set ts=8 sts=4 sw=4 et: