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 SvPADSTALE_off(*svp); /* mark lexical as active */
526 if ((offset_shifted >> SAVE_TIGHT_SHIFT) != offset)
527 Perl_croak(aTHX_ "panic: pad offset %"UVuf" out of range (%p-%p)",
528 offset, svp, PL_curpad);
531 SSPUSHUV(offset_shifted | SAVEt_CLEARSV);
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 /* The array needs to hold a reference count on its new element, so it
632 if (!AvREAL(av) && AvREIFY(av))
634 save_scalar_at(sptr, flags); /* XXX - FIXME - see #60360 */
635 if (flags & SAVEf_KEEPOLDELEM)
638 /* If we're localizing a tied array element, this new sv
639 * won't actually be stored in the array - so it won't get
640 * reaped when the localize ends. Ensure it gets reaped by
641 * mortifying it instead. DAPM */
642 if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied))
647 Perl_save_helem_flags(pTHX_ HV *hv, SV *key, SV **sptr, const U32 flags)
652 PERL_ARGS_ASSERT_SAVE_HELEM_FLAGS;
656 SSPUSHPTR(SvREFCNT_inc_simple(hv));
657 SSPUSHPTR(newSVsv(key));
658 SSPUSHPTR(SvREFCNT_inc(*sptr));
659 SSPUSHUV(SAVEt_HELEM);
660 save_scalar_at(sptr, flags);
661 if (flags & SAVEf_KEEPOLDELEM)
664 /* If we're localizing a tied hash element, this new sv
665 * won't actually be stored in the hash - so it won't get
666 * reaped when the localize ends. Ensure it gets reaped by
667 * mortifying it instead. DAPM */
668 if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
673 Perl_save_svref(pTHX_ SV **sptr)
677 PERL_ARGS_ASSERT_SAVE_SVREF;
680 save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_SVREF);
681 return save_scalar_at(sptr, SAVEf_SETMAGIC); /* XXX - FIXME - see #60360 */
685 Perl_save_alloc(pTHX_ I32 size, I32 pad)
688 const I32 start = pad + ((char*)&PL_savestack[PL_savestack_ix]
689 - (char*)PL_savestack);
690 const UV elems = 1 + ((size + pad - 1) / sizeof(*PL_savestack));
691 const UV elems_shifted = elems << SAVE_TIGHT_SHIFT;
693 if ((elems_shifted >> SAVE_TIGHT_SHIFT) != elems)
694 Perl_croak(aTHX_ "panic: save_alloc elems %"UVuf" out of range (%ld-%ld)",
699 PL_savestack_ix += elems;
700 SSPUSHUV(SAVEt_ALLOC | elems_shifted);
705 Perl_leave_scope(pTHX_ I32 base)
716 /* Localise the effects of the TAINT_NOT inside the loop. */
717 bool was = TAINT_get;
720 Perl_croak(aTHX_ "panic: corrupt saved stack index %ld", (long) base);
721 DEBUG_l(Perl_deb(aTHX_ "savestack: releasing items %ld -> %ld\n",
722 (long)PL_savestack_ix, (long)base));
723 while (PL_savestack_ix > base) {
725 const U8 type = (U8)uv & SAVE_MASK;
729 case SAVEt_ITEM: /* normal string */
730 value = MUTABLE_SV(SSPOPPTR);
731 sv = MUTABLE_SV(SSPOPPTR);
732 sv_replace(sv,value);
737 case SAVEt_SV: /* scalar reference */
738 value = MUTABLE_SV(SSPOPPTR);
739 gv = MUTABLE_GV(SSPOPPTR);
741 av = MUTABLE_AV(gv); /* what to refcnt_dec */
750 SvREFCNT_dec(av); /* av may actually be an AV, HV or GV */
752 case SAVEt_GENERIC_PVREF: /* generic pv */
754 str = (char*)SSPOPPTR;
755 if (*(char**)ptr != str) {
756 Safefree(*(char**)ptr);
760 case SAVEt_SHARED_PVREF: /* shared pv */
761 str = (char*)SSPOPPTR;
763 if (*(char**)ptr != str) {
765 PerlMem_free(*(char**)ptr);
767 PerlMemShared_free(*(char**)ptr);
772 case SAVEt_GVSV: /* scalar slot in GV */
773 value = MUTABLE_SV(SSPOPPTR);
774 gv = MUTABLE_GV(SSPOPPTR);
777 case SAVEt_GENERIC_SVREF: /* generic sv */
778 value = MUTABLE_SV(SSPOPPTR);
786 case SAVEt_AV: /* array reference */
787 av = MUTABLE_AV(SSPOPPTR);
788 gv = MUTABLE_GV(SSPOPPTR);
789 SvREFCNT_dec(GvAV(gv));
793 SvSETMAGIC(MUTABLE_SV(av));
798 case SAVEt_HV: /* hash reference */
799 hv = MUTABLE_HV(SSPOPPTR);
800 gv = MUTABLE_GV(SSPOPPTR);
801 SvREFCNT_dec(GvHV(gv));
805 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);
821 #if !NO_TAINT_SUPPORT
822 if (ptr == &(TAINT_get)) {
823 /* If we don't update <was>, to reflect what was saved on the
824 * stack for PL_tainted, then we will overwrite this attempt to
825 * restore it when we exit this routine. Note that this won't
826 * work if this value was saved in a wider-than necessary type,
832 case SAVEt_I32_SMALL:
834 *(I32*)ptr = (I32)(uv >> SAVE_TIGHT_SHIFT);
836 case SAVEt_I32: /* I32 reference */
838 #ifdef PERL_DEBUG_READONLY_OPS
840 const I32 val = SSPOPINT;
841 if (*(I32*)ptr != val)
845 *(I32*)ptr = (I32)SSPOPINT;
848 case SAVEt_SPTR: /* SV* reference */
850 *(SV**)ptr = MUTABLE_SV(SSPOPPTR);
852 case SAVEt_VPTR: /* random* reference */
853 case SAVEt_PPTR: /* char* reference */
855 *(char**)ptr = (char*)SSPOPPTR;
857 case SAVEt_HPTR: /* HV* reference */
859 *(HV**)ptr = MUTABLE_HV(SSPOPPTR);
861 case SAVEt_APTR: /* AV* reference */
863 *(AV**)ptr = MUTABLE_AV(SSPOPPTR);
865 case SAVEt_GP: /* scalar reference */
867 gv = MUTABLE_GV(SSPOPPTR);
869 GvGP_set(gv, (GP*)ptr);
870 /* putting a method back into circulation ("local")*/
871 if (GvCVu(gv) && (hv=GvSTASH(gv)) && HvENAME_get(hv))
872 mro_method_changed_in(hv);
877 SvREFCNT_dec(MUTABLE_SV(ptr));
879 case SAVEt_FREECOPHH:
881 cophh_free((COPHH *)ptr);
883 case SAVEt_MORTALIZESV:
885 sv_2mortal(MUTABLE_SV(ptr));
889 ASSERT_CURPAD_LEGAL("SAVEt_FREEOP");
899 case SAVEt_CLEARPADRANGE:
900 i = (I32)((uv >> SAVE_TIGHT_SHIFT) & OPpPADRANGE_COUNTMASK);
901 svp = &PL_curpad[uv >>
902 (OPpPADRANGE_COUNTSHIFT + SAVE_TIGHT_SHIFT)] + i - 1;
905 svp = &PL_curpad[uv >> SAVE_TIGHT_SHIFT];
908 for (; i; i--, svp--) {
911 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
912 "Pad 0x%"UVxf"[0x%"UVxf"] clearsv: %ld sv=0x%"UVxf"<%"IVdf"> %s\n",
913 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
914 (long)(svp-PL_curpad), PTR2UV(sv), (IV)SvREFCNT(sv),
915 (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) ? "clear" : "abandon"
918 /* Can clear pad variable in place? */
919 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
921 * if a my variable that was made readonly is going out of
922 * scope, we want to remove the readonlyness so that it can
923 * go out of scope quietly
925 if (SvPADMY(sv) && !SvFAKE(sv))
928 if (SvTHINKFIRST(sv))
929 sv_force_normal_flags(sv, SV_IMMEDIATE_UNREF
931 if (SvTYPE(sv) == SVt_PVHV)
932 Perl_hv_kill_backrefs(aTHX_ MUTABLE_HV(sv));
935 sv_unmagic(sv, PERL_MAGIC_backref);
936 if (SvTYPE(sv) != SVt_PVCV)
940 switch (SvTYPE(sv)) {
944 av_clear(MUTABLE_AV(sv));
947 hv_clear(MUTABLE_HV(sv));
951 HEK * const hek = CvNAME_HEK((CV *)sv);
955 CvNAME_HEK_set(sv, hek);
962 SvPADSTALE_on(sv); /* mark as no longer live */
964 else { /* Someone has a claim on this, so abandon it. */
965 assert( SvFLAGS(sv) & SVs_PADMY);
966 assert(!(SvFLAGS(sv) & SVs_PADTMP));
967 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
968 case SVt_PVAV: *svp = MUTABLE_SV(newAV()); break;
969 case SVt_PVHV: *svp = MUTABLE_SV(newHV()); break;
973 *svp = newSV_type(SVt_PVCV);
978 share_hek_hek(CvNAME_HEK((CV *)sv)));
981 default: *svp = newSV(0); break;
983 SvREFCNT_dec(sv); /* Cast current value to the winds. */
984 /* preserve pad nature, but also mark as not live
985 * for any closure capturing */
986 SvFLAGS(*svp) |= (SVs_PADMY|SVs_PADSTALE);
993 hv = MUTABLE_HV(ptr);
996 (void)hv_delete(hv, (char*)ptr, i, G_DISCARD);
1002 av = MUTABLE_AV(ptr);
1004 (void)av_delete(av, i, G_DISCARD);
1007 case SAVEt_DESTRUCTOR_X:
1009 (*SSPOPDXPTR)(aTHX_ ptr);
1011 case SAVEt_REGCONTEXT:
1012 /* regexp must have croaked */
1014 PL_savestack_ix -= uv >> SAVE_TIGHT_SHIFT;
1016 case SAVEt_STACK_POS: /* Position on Perl stack */
1018 PL_stack_sp = PL_stack_base + i;
1020 case SAVEt_STACK_CXPOS: /* blk_oldsp on context stack */
1022 cxstack[i].blk_oldsp = SSPOPINT;
1024 case SAVEt_AELEM: /* array element */
1025 value = MUTABLE_SV(SSPOPPTR);
1027 av = MUTABLE_AV(SSPOPPTR);
1028 ptr = av_fetch(av,i,1);
1029 if (!AvREAL(av) && AvREIFY(av)) /* undo reify guard */
1030 SvREFCNT_dec(value);
1033 if (sv && sv != &PL_sv_undef) {
1034 if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied))
1035 SvREFCNT_inc_void_NN(sv);
1040 SvREFCNT_dec(value);
1042 case SAVEt_HELEM: /* hash element */
1043 value = MUTABLE_SV(SSPOPPTR);
1044 sv = MUTABLE_SV(SSPOPPTR);
1045 hv = MUTABLE_HV(SSPOPPTR);
1046 ptr = hv_fetch_ent(hv, sv, 1, 0);
1049 const SV * const oval = HeVAL((HE*)ptr);
1050 if (oval && oval != &PL_sv_undef) {
1051 ptr = &HeVAL((HE*)ptr);
1052 if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1053 SvREFCNT_inc_void(*(SV**)ptr);
1054 av = MUTABLE_AV(hv); /* what to refcnt_dec */
1059 SvREFCNT_dec(value);
1062 PL_op = (OP*)SSPOPPTR;
1065 if ((PL_hints & HINT_LOCALIZE_HH)) {
1066 while (GvHV(PL_hintgv)) {
1067 HV *hv = GvHV(PL_hintgv);
1068 GvHV(PL_hintgv) = NULL;
1069 SvREFCNT_dec(MUTABLE_SV(hv));
1072 cophh_free(CopHINTHASH_get(&PL_compiling));
1073 CopHINTHASH_set(&PL_compiling, (COPHH*)SSPOPPTR);
1074 *(I32*)&PL_hints = (I32)SSPOPINT;
1075 if (PL_hints & HINT_LOCALIZE_HH) {
1076 SvREFCNT_dec(MUTABLE_SV(GvHV(PL_hintgv)));
1077 GvHV(PL_hintgv) = MUTABLE_HV(SSPOPPTR);
1079 if (!GvHV(PL_hintgv)) {
1080 /* Need to add a new one manually, else rv2hv can
1081 add one via GvHVn and it won't have the magic set. */
1082 HV *const hv = newHV();
1083 hv_magic(hv, NULL, PERL_MAGIC_hints);
1084 GvHV(PL_hintgv) = hv;
1086 assert(GvHV(PL_hintgv));
1089 PL_comppad = (PAD*)SSPOPPTR;
1091 PL_curpad = AvARRAY(PL_comppad);
1095 case SAVEt_PADSV_AND_MORTALIZE:
1097 const PADOFFSET off = (PADOFFSET)SSPOPLONG;
1101 svp = AvARRAY((PAD*)ptr) + off;
1102 /* This mortalizing used to be done by POPLOOP() via itersave.
1103 But as we have all the information here, we can do it here,
1104 save even having to have itersave in the struct. */
1106 *svp = MUTABLE_SV(SSPOPPTR);
1109 case SAVEt_SAVESWITCHSTACK:
1112 AV *const t = MUTABLE_AV(SSPOPPTR);
1113 AV *const f = MUTABLE_AV(SSPOPPTR);
1115 PL_curstackinfo->si_stack = f;
1118 case SAVEt_SET_SVFLAGS:
1120 const U32 val = (U32)SSPOPINT;
1121 const U32 mask = (U32)SSPOPINT;
1122 sv = MUTABLE_SV(SSPOPPTR);
1123 SvFLAGS(sv) &= ~mask;
1128 /* This would be a mathom, but Perl_save_svref() calls a static
1129 function, S_save_scalar_at(), so has to stay in this file. */
1130 case SAVEt_SVREF: /* scalar reference */
1131 value = MUTABLE_SV(SSPOPPTR);
1133 av = NULL; /* what to refcnt_dec */
1136 /* These are only saved in mathoms.c */
1138 gv = MUTABLE_GV(SSPOPPTR);
1139 (void)sv_clear(MUTABLE_SV(gv));
1141 case SAVEt_LONG: /* long reference */
1143 *(long*)ptr = (long)SSPOPLONG;
1145 case SAVEt_IV: /* IV reference */
1147 *(IV*)ptr = (IV)SSPOPIV;
1150 case SAVEt_I16: /* I16 reference */
1152 *(I16*)ptr = (I16)(uv >> 8);
1154 case SAVEt_I8: /* I8 reference */
1156 *(I8*)ptr = (I8)(uv >> 8);
1158 case SAVEt_DESTRUCTOR:
1162 case SAVEt_COMPILE_WARNINGS:
1165 if (!specialWARN(PL_compiling.cop_warnings))
1166 PerlMemShared_free(PL_compiling.cop_warnings);
1168 PL_compiling.cop_warnings = (STRLEN*)ptr;
1170 case SAVEt_RE_STATE:
1172 const struct re_save_state *const state
1173 = (struct re_save_state *)
1174 (PL_savestack + PL_savestack_ix
1175 - SAVESTACK_ALLOC_FOR_RE_SAVE_STATE);
1176 PL_savestack_ix -= SAVESTACK_ALLOC_FOR_RE_SAVE_STATE;
1178 if (PL_reg_poscache != state->re_state_reg_poscache) {
1179 Safefree(PL_reg_poscache);
1181 Copy(state, &PL_reg_state, 1, struct re_save_state);
1186 parser_free((yy_parser *) ptr);
1189 Perl_croak(aTHX_ "panic: leave_scope inconsistency %u", type);
1199 Perl_cx_dump(pTHX_ PERL_CONTEXT *cx)
1203 PERL_ARGS_ASSERT_CX_DUMP;
1206 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]);
1207 if (CxTYPE(cx) != CXt_SUBST) {
1208 const char *gimme_text;
1209 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
1210 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%"UVxf"\n",
1211 PTR2UV(cx->blk_oldcop));
1212 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
1213 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
1214 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%"UVxf"\n",
1215 PTR2UV(cx->blk_oldpm));
1216 switch (cx->blk_gimme) {
1218 gimme_text = "VOID";
1221 gimme_text = "SCALAR";
1224 gimme_text = "LIST";
1227 gimme_text = "UNKNOWN";
1230 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", gimme_text);
1232 switch (CxTYPE(cx)) {
1237 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.CV = 0x%"UVxf"\n",
1238 PTR2UV(cx->blk_format.cv));
1239 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.GV = 0x%"UVxf"\n",
1240 PTR2UV(cx->blk_format.gv));
1241 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.DFOUTGV = 0x%"UVxf"\n",
1242 PTR2UV(cx->blk_format.dfoutgv));
1243 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.HASARGS = %d\n",
1244 (int)CxHASARGS(cx));
1245 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.RETOP = 0x%"UVxf"\n",
1246 PTR2UV(cx->blk_format.retop));
1249 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%"UVxf"\n",
1250 PTR2UV(cx->blk_sub.cv));
1251 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
1252 (long)cx->blk_sub.olddepth);
1253 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
1254 (int)CxHASARGS(cx));
1255 PerlIO_printf(Perl_debug_log, "BLK_SUB.LVAL = %d\n", (int)CxLVAL(cx));
1256 PerlIO_printf(Perl_debug_log, "BLK_SUB.RETOP = 0x%"UVxf"\n",
1257 PTR2UV(cx->blk_sub.retop));
1260 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
1261 (long)CxOLD_IN_EVAL(cx));
1262 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
1263 PL_op_name[CxOLD_OP_TYPE(cx)],
1264 PL_op_desc[CxOLD_OP_TYPE(cx)]);
1265 if (cx->blk_eval.old_namesv)
1266 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
1267 SvPVX_const(cx->blk_eval.old_namesv));
1268 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%"UVxf"\n",
1269 PTR2UV(cx->blk_eval.old_eval_root));
1270 PerlIO_printf(Perl_debug_log, "BLK_EVAL.RETOP = 0x%"UVxf"\n",
1271 PTR2UV(cx->blk_eval.retop));
1274 case CXt_LOOP_LAZYIV:
1275 case CXt_LOOP_LAZYSV:
1277 case CXt_LOOP_PLAIN:
1278 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n", CxLABEL(cx));
1279 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
1280 (long)cx->blk_loop.resetsp);
1281 PerlIO_printf(Perl_debug_log, "BLK_LOOP.MY_OP = 0x%"UVxf"\n",
1282 PTR2UV(cx->blk_loop.my_op));
1283 /* XXX: not accurate for LAZYSV/IV */
1284 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%"UVxf"\n",
1285 PTR2UV(cx->blk_loop.state_u.ary.ary));
1286 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
1287 (long)cx->blk_loop.state_u.ary.ix);
1288 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%"UVxf"\n",
1289 PTR2UV(CxITERVAR(cx)));
1293 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
1294 (long)cx->sb_iters);
1295 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
1296 (long)cx->sb_maxiters);
1297 PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n",
1298 (long)cx->sb_rflags);
1299 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
1301 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
1303 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%"UVxf"\n",
1304 PTR2UV(cx->sb_dstr));
1305 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%"UVxf"\n",
1306 PTR2UV(cx->sb_targ));
1307 PerlIO_printf(Perl_debug_log, "SB_S = 0x%"UVxf"\n",
1309 PerlIO_printf(Perl_debug_log, "SB_M = 0x%"UVxf"\n",
1311 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%"UVxf"\n",
1312 PTR2UV(cx->sb_strend));
1313 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%"UVxf"\n",
1314 PTR2UV(cx->sb_rxres));
1318 PERL_UNUSED_CONTEXT;
1319 PERL_UNUSED_ARG(cx);
1320 #endif /* DEBUGGING */
1325 * c-indentation-style: bsd
1327 * indent-tabs-mode: nil
1330 * ex: set ts=8 sts=4 sw=4 et: