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)) {
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, cBOOL(flags & SAVEf_SETMAGIC));
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;
282 save_pushptrptr(SvREFCNT_inc(gv), GvGP(gv), SAVEt_GP);
285 GP *gp = Perl_newGP(aTHX_ gv);
288 mro_method_changed_in(GvSTASH(gv)); /* taking a method out of circulation ("local")*/
289 if (GvIOp(gv) && (IoFLAGS(GvIOp(gv)) & IOf_ARGV)) {
291 IoFLAGS(gp->gp_io) |= IOf_ARGV|IOf_START;
293 #ifdef PERL_DONT_CREATE_GVSV
294 if (gv == PL_errgv) {
295 /* We could scatter this logic everywhere by changing the
296 definition of ERRSV from GvSV() to GvSVn(), but it seems more
297 efficient to do this check once here. */
298 gp->gp_sv = newSV(0);
310 Perl_save_ary(pTHX_ GV *gv)
313 AV * const oav = GvAVn(gv);
316 PERL_ARGS_ASSERT_SAVE_ARY;
318 if (!AvREAL(oav) && AvREIFY(oav))
320 save_pushptrptr(SvREFCNT_inc_simple_NN(gv), oav, SAVEt_AV);
325 mg_localize(MUTABLE_SV(oav), MUTABLE_SV(av), TRUE);
330 Perl_save_hash(pTHX_ GV *gv)
335 PERL_ARGS_ASSERT_SAVE_HASH;
338 SvREFCNT_inc_simple_NN(gv), (ohv = GvHVn(gv)), SAVEt_HV
344 mg_localize(MUTABLE_SV(ohv), MUTABLE_SV(hv), TRUE);
349 Perl_save_item(pTHX_ register SV *item)
352 register SV * const sv = newSVsv(item);
354 PERL_ARGS_ASSERT_SAVE_ITEM;
356 save_pushptrptr(item, /* remember the pointer */
357 sv, /* remember the value */
362 Perl_save_bool(pTHX_ bool *boolp)
366 PERL_ARGS_ASSERT_SAVE_BOOL;
370 SSPUSHUV(SAVEt_BOOL | (*boolp << 8));
374 Perl_save_pushi32ptr(pTHX_ const I32 i, void *const ptr, const int type)
384 Perl_save_int(pTHX_ int *intp)
387 const UV shifted = (UV)*intp << SAVE_TIGHT_SHIFT;
389 PERL_ARGS_ASSERT_SAVE_INT;
391 if ((int)(shifted >> SAVE_TIGHT_SHIFT) == *intp) {
394 SSPUSHUV(SAVEt_INT_SMALL | shifted);
396 save_pushi32ptr(*intp, intp, SAVEt_INT);
400 Perl_save_I8(pTHX_ I8 *bytep)
404 PERL_ARGS_ASSERT_SAVE_I8;
408 SSPUSHUV(SAVEt_I8 | ((UV)*bytep << 8));
412 Perl_save_I16(pTHX_ I16 *intp)
416 PERL_ARGS_ASSERT_SAVE_I16;
420 SSPUSHUV(SAVEt_I16 | ((UV)*intp << 8));
424 Perl_save_I32(pTHX_ I32 *intp)
427 const UV shifted = (UV)*intp << SAVE_TIGHT_SHIFT;
429 PERL_ARGS_ASSERT_SAVE_I32;
431 if ((I32)(shifted >> SAVE_TIGHT_SHIFT) == *intp) {
434 SSPUSHUV(SAVEt_I32_SMALL | shifted);
436 save_pushi32ptr(*intp, intp, SAVEt_I32);
439 /* Cannot use save_sptr() to store a char* since the SV** cast will
440 * force word-alignment and we'll miss the pointer.
443 Perl_save_pptr(pTHX_ char **pptr)
447 PERL_ARGS_ASSERT_SAVE_PPTR;
449 save_pushptrptr(*pptr, pptr, SAVEt_PPTR);
453 Perl_save_vptr(pTHX_ void *ptr)
457 PERL_ARGS_ASSERT_SAVE_VPTR;
459 save_pushptrptr(*(char**)ptr, ptr, SAVEt_VPTR);
463 Perl_save_sptr(pTHX_ SV **sptr)
467 PERL_ARGS_ASSERT_SAVE_SPTR;
469 save_pushptrptr(*sptr, sptr, SAVEt_SPTR);
473 Perl_save_padsv_and_mortalize(pTHX_ PADOFFSET off)
477 ASSERT_CURPAD_ACTIVE("save_padsv");
478 SSPUSHPTR(SvREFCNT_inc_simple_NN(PL_curpad[off]));
479 SSPUSHPTR(PL_comppad);
480 SSPUSHLONG((long)off);
481 SSPUSHUV(SAVEt_PADSV_AND_MORTALIZE);
485 Perl_save_hptr(pTHX_ HV **hptr)
489 PERL_ARGS_ASSERT_SAVE_HPTR;
491 save_pushptrptr(*hptr, hptr, SAVEt_HPTR);
495 Perl_save_aptr(pTHX_ AV **aptr)
499 PERL_ARGS_ASSERT_SAVE_APTR;
501 save_pushptrptr(*aptr, aptr, SAVEt_APTR);
505 Perl_save_pushptr(pTHX_ void *const ptr, const int type)
514 Perl_save_clearsv(pTHX_ SV **svp)
517 const UV offset = svp - PL_curpad;
518 const UV offset_shifted = offset << SAVE_TIGHT_SHIFT;
520 PERL_ARGS_ASSERT_SAVE_CLEARSV;
522 ASSERT_CURPAD_ACTIVE("save_clearsv");
523 if ((offset_shifted >> SAVE_TIGHT_SHIFT) != offset)
524 Perl_croak(aTHX_ "panic: pad offset %"UVuf" out of range (%p-%p)",
525 offset, svp, PL_curpad);
528 SSPUSHUV(offset_shifted | SAVEt_CLEARSV);
529 SvPADSTALE_off(*svp); /* mark lexical as active */
533 Perl_save_delete(pTHX_ HV *hv, char *key, I32 klen)
537 PERL_ARGS_ASSERT_SAVE_DELETE;
539 save_pushptri32ptr(key, klen, SvREFCNT_inc_simple(hv), SAVEt_DELETE);
543 Perl_save_hdelete(pTHX_ HV *hv, SV *keysv)
549 PERL_ARGS_ASSERT_SAVE_HDELETE;
551 key = SvPV_const(keysv, len);
552 klen = SvUTF8(keysv) ? -(I32)len : (I32)len;
553 SvREFCNT_inc_simple_void_NN(hv);
554 save_pushptri32ptr(savepvn(key, len), klen, hv, SAVEt_DELETE);
558 Perl_save_adelete(pTHX_ AV *av, I32 key)
562 PERL_ARGS_ASSERT_SAVE_ADELETE;
564 SvREFCNT_inc_void(av);
565 save_pushi32ptr(key, av, SAVEt_ADELETE);
569 Perl_save_destructor(pTHX_ DESTRUCTORFUNC_NOCONTEXT_t f, void* p)
573 PERL_ARGS_ASSERT_SAVE_DESTRUCTOR;
578 SSPUSHUV(SAVEt_DESTRUCTOR);
582 Perl_save_destructor_x(pTHX_ DESTRUCTORFUNC_t f, void* p)
588 SSPUSHUV(SAVEt_DESTRUCTOR_X);
592 Perl_save_hints(pTHX)
595 COPHH *save_cophh = cophh_copy(CopHINTHASH_get(&PL_compiling));
596 if (PL_hints & HINT_LOCALIZE_HH) {
597 HV *oldhh = GvHV(PL_hintgv);
598 save_pushptri32ptr(oldhh, PL_hints, save_cophh, SAVEt_HINTS);
599 GvHV(PL_hintgv) = NULL; /* in case copying dies */
600 GvHV(PL_hintgv) = hv_copy_hints_hv(oldhh);
602 save_pushi32ptr(PL_hints, save_cophh, SAVEt_HINTS);
607 S_save_pushptri32ptr(pTHX_ void *const ptr1, const I32 i, void *const ptr2,
618 Perl_save_aelem_flags(pTHX_ AV *av, I32 idx, SV **sptr, const U32 flags)
623 PERL_ARGS_ASSERT_SAVE_AELEM_FLAGS;
626 save_pushptri32ptr(SvREFCNT_inc_simple(av), idx, SvREFCNT_inc(*sptr),
628 /* if it gets reified later, the restore will have the wrong refcnt */
629 if (!AvREAL(av) && AvREIFY(av))
630 SvREFCNT_inc_void(*sptr);
631 save_scalar_at(sptr, flags); /* XXX - FIXME - see #60360 */
632 if (flags & SAVEf_KEEPOLDELEM)
635 /* If we're localizing a tied array element, this new sv
636 * won't actually be stored in the array - so it won't get
637 * reaped when the localize ends. Ensure it gets reaped by
638 * mortifying it instead. DAPM */
639 if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied))
644 Perl_save_helem_flags(pTHX_ HV *hv, SV *key, SV **sptr, const U32 flags)
649 PERL_ARGS_ASSERT_SAVE_HELEM_FLAGS;
653 SSPUSHPTR(SvREFCNT_inc_simple(hv));
654 SSPUSHPTR(newSVsv(key));
655 SSPUSHPTR(SvREFCNT_inc(*sptr));
656 SSPUSHUV(SAVEt_HELEM);
657 save_scalar_at(sptr, flags);
658 if (flags & SAVEf_KEEPOLDELEM)
661 /* If we're localizing a tied hash element, this new sv
662 * won't actually be stored in the hash - so it won't get
663 * reaped when the localize ends. Ensure it gets reaped by
664 * mortifying it instead. DAPM */
665 if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
670 Perl_save_svref(pTHX_ SV **sptr)
674 PERL_ARGS_ASSERT_SAVE_SVREF;
677 save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_SVREF);
678 return save_scalar_at(sptr, SAVEf_SETMAGIC); /* XXX - FIXME - see #60360 */
682 Perl_save_alloc(pTHX_ I32 size, I32 pad)
685 register const I32 start = pad + ((char*)&PL_savestack[PL_savestack_ix]
686 - (char*)PL_savestack);
687 const UV elems = 1 + ((size + pad - 1) / sizeof(*PL_savestack));
688 const UV elems_shifted = elems << SAVE_TIGHT_SHIFT;
690 if ((elems_shifted >> SAVE_TIGHT_SHIFT) != elems)
691 Perl_croak(aTHX_ "panic: save_alloc elems %"UVuf" out of range (%ld-%ld)",
696 PL_savestack_ix += elems;
697 SSPUSHUV(SAVEt_ALLOC | elems_shifted);
702 Perl_leave_scope(pTHX_ I32 base)
713 /* Localise the effects of the TAINT_NOT inside the loop. */
714 bool was = PL_tainted;
717 Perl_croak(aTHX_ "panic: corrupt saved stack index %ld", (long) base);
718 DEBUG_l(Perl_deb(aTHX_ "savestack: releasing items %ld -> %ld\n",
719 (long)PL_savestack_ix, (long)base));
720 while (PL_savestack_ix > base) {
722 const U8 type = (U8)uv & SAVE_MASK;
726 case SAVEt_ITEM: /* normal string */
727 value = MUTABLE_SV(SSPOPPTR);
728 sv = MUTABLE_SV(SSPOPPTR);
729 sv_replace(sv,value);
734 case SAVEt_SV: /* scalar reference */
735 value = MUTABLE_SV(SSPOPPTR);
736 gv = MUTABLE_GV(SSPOPPTR);
738 av = MUTABLE_AV(gv); /* what to refcnt_dec */
747 SvREFCNT_dec(av); /* av may actually be an AV, HV or GV */
749 case SAVEt_GENERIC_PVREF: /* generic pv */
751 str = (char*)SSPOPPTR;
752 if (*(char**)ptr != str) {
753 Safefree(*(char**)ptr);
757 case SAVEt_SHARED_PVREF: /* shared pv */
758 str = (char*)SSPOPPTR;
760 if (*(char**)ptr != str) {
762 PerlMem_free(*(char**)ptr);
764 PerlMemShared_free(*(char**)ptr);
769 case SAVEt_GVSV: /* scalar slot in GV */
770 value = MUTABLE_SV(SSPOPPTR);
771 gv = MUTABLE_GV(SSPOPPTR);
774 case SAVEt_GENERIC_SVREF: /* generic sv */
775 value = MUTABLE_SV(SSPOPPTR);
783 case SAVEt_AV: /* array reference */
784 av = MUTABLE_AV(SSPOPPTR);
785 gv = MUTABLE_GV(SSPOPPTR);
786 SvREFCNT_dec(GvAV(gv));
790 SvSETMAGIC(MUTABLE_SV(av));
795 case SAVEt_HV: /* hash reference */
796 hv = MUTABLE_HV(SSPOPPTR);
797 gv = MUTABLE_GV(SSPOPPTR);
798 SvREFCNT_dec(GvHV(gv));
802 SvSETMAGIC(MUTABLE_SV(hv));
807 case SAVEt_INT_SMALL:
809 *(int*)ptr = (int)(uv >> SAVE_TIGHT_SHIFT);
811 case SAVEt_INT: /* int reference */
813 *(int*)ptr = (int)SSPOPINT;
815 case SAVEt_BOOL: /* bool reference */
817 *(bool*)ptr = cBOOL(uv >> 8);
819 if (ptr == &PL_tainted) {
820 /* If we don't update <was>, to reflect what was saved on the
821 * stack for PL_tainted, then we will overwrite this attempt to
822 * restore it when we exit this routine. Note that this won't
823 * work if this value was saved in a wider-than necessary type,
828 case SAVEt_I32_SMALL:
830 *(I32*)ptr = (I32)(uv >> SAVE_TIGHT_SHIFT);
832 case SAVEt_I32: /* I32 reference */
834 #ifdef PERL_DEBUG_READONLY_OPS
836 const I32 val = SSPOPINT;
837 if (*(I32*)ptr != val)
841 *(I32*)ptr = (I32)SSPOPINT;
844 case SAVEt_SPTR: /* SV* reference */
846 *(SV**)ptr = MUTABLE_SV(SSPOPPTR);
848 case SAVEt_VPTR: /* random* reference */
849 case SAVEt_PPTR: /* char* reference */
851 *(char**)ptr = (char*)SSPOPPTR;
853 case SAVEt_HPTR: /* HV* reference */
855 *(HV**)ptr = MUTABLE_HV(SSPOPPTR);
857 case SAVEt_APTR: /* AV* reference */
859 *(AV**)ptr = MUTABLE_AV(SSPOPPTR);
861 case SAVEt_GP: /* scalar reference */
863 gv = MUTABLE_GV(SSPOPPTR);
865 GvGP_set(gv, (GP*)ptr);
866 /* putting a method back into circulation ("local")*/
867 if (GvCVu(gv) && (hv=GvSTASH(gv)) && HvENAME_get(hv))
868 mro_method_changed_in(hv);
873 SvREFCNT_dec(MUTABLE_SV(ptr));
875 case SAVEt_FREECOPHH:
877 cophh_free((COPHH *)ptr);
879 case SAVEt_MORTALIZESV:
881 sv_2mortal(MUTABLE_SV(ptr));
885 ASSERT_CURPAD_LEGAL("SAVEt_FREEOP"); /* XXX DAPM tmp */
893 ptr = (void*)&PL_curpad[uv >> SAVE_TIGHT_SHIFT];
896 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
897 "Pad 0x%"UVxf"[0x%"UVxf"] clearsv: %ld sv=0x%"UVxf"<%"IVdf"> %s\n",
898 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
899 (long)((SV **)ptr-PL_curpad), PTR2UV(sv), (IV)SvREFCNT(sv),
900 (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) ? "clear" : "abandon"
903 /* Can clear pad variable in place? */
904 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
906 * if a my variable that was made readonly is going out of
907 * scope, we want to remove the readonlyness so that it can
908 * go out of scope quietly
910 if (SvPADMY(sv) && !SvFAKE(sv))
913 if (SvTHINKFIRST(sv))
914 sv_force_normal_flags(sv, SV_IMMEDIATE_UNREF
916 if (SvTYPE(sv) == SVt_PVHV)
917 Perl_hv_kill_backrefs(aTHX_ MUTABLE_HV(sv));
919 sv_unmagic(sv, PERL_MAGIC_backref),
922 switch (SvTYPE(sv)) {
926 av_clear(MUTABLE_AV(sv));
929 hv_clear(MUTABLE_HV(sv));
932 Perl_croak(aTHX_ "panic: leave_scope pad code");
937 SvPADSTALE_on(sv); /* mark as no longer live */
939 else { /* Someone has a claim on this, so abandon it. */
940 assert( SvFLAGS(sv) & SVs_PADMY);
941 assert(!(SvFLAGS(sv) & SVs_PADTMP));
942 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
943 case SVt_PVAV: *(SV**)ptr = MUTABLE_SV(newAV()); break;
944 case SVt_PVHV: *(SV**)ptr = MUTABLE_SV(newHV()); break;
945 default: *(SV**)ptr = newSV(0); break;
947 SvREFCNT_dec(sv); /* Cast current value to the winds. */
948 /* preserve pad nature, but also mark as not live
949 * for any closure capturing */
950 SvFLAGS(*(SV**)ptr) |= (SVs_PADMY|SVs_PADSTALE);
955 hv = MUTABLE_HV(ptr);
958 (void)hv_delete(hv, (char*)ptr, i, G_DISCARD);
964 av = MUTABLE_AV(ptr);
966 (void)av_delete(av, i, G_DISCARD);
969 case SAVEt_DESTRUCTOR_X:
971 (*SSPOPDXPTR)(aTHX_ ptr);
973 case SAVEt_REGCONTEXT:
974 /* regexp must have croaked */
976 PL_savestack_ix -= uv >> SAVE_TIGHT_SHIFT;
978 case SAVEt_STACK_POS: /* Position on Perl stack */
980 PL_stack_sp = PL_stack_base + i;
982 case SAVEt_STACK_CXPOS: /* blk_oldsp on context stack */
984 cxstack[i].blk_oldsp = SSPOPINT;
986 case SAVEt_AELEM: /* array element */
987 value = MUTABLE_SV(SSPOPPTR);
989 av = MUTABLE_AV(SSPOPPTR);
990 ptr = av_fetch(av,i,1);
991 if (!AvREAL(av) && AvREIFY(av)) /* undo reify guard */
995 if (sv && sv != &PL_sv_undef) {
996 if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied))
997 SvREFCNT_inc_void_NN(sv);
1002 SvREFCNT_dec(value);
1004 case SAVEt_HELEM: /* hash element */
1005 value = MUTABLE_SV(SSPOPPTR);
1006 sv = MUTABLE_SV(SSPOPPTR);
1007 hv = MUTABLE_HV(SSPOPPTR);
1008 ptr = hv_fetch_ent(hv, sv, 1, 0);
1011 const SV * const oval = HeVAL((HE*)ptr);
1012 if (oval && oval != &PL_sv_undef) {
1013 ptr = &HeVAL((HE*)ptr);
1014 if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1015 SvREFCNT_inc_void(*(SV**)ptr);
1016 av = MUTABLE_AV(hv); /* what to refcnt_dec */
1021 SvREFCNT_dec(value);
1024 PL_op = (OP*)SSPOPPTR;
1027 if ((PL_hints & HINT_LOCALIZE_HH)) {
1028 while (GvHV(PL_hintgv)) {
1029 HV *hv = GvHV(PL_hintgv);
1030 GvHV(PL_hintgv) = NULL;
1031 SvREFCNT_dec(MUTABLE_SV(hv));
1034 cophh_free(CopHINTHASH_get(&PL_compiling));
1035 CopHINTHASH_set(&PL_compiling, (COPHH*)SSPOPPTR);
1036 *(I32*)&PL_hints = (I32)SSPOPINT;
1037 if (PL_hints & HINT_LOCALIZE_HH) {
1038 SvREFCNT_dec(MUTABLE_SV(GvHV(PL_hintgv)));
1039 GvHV(PL_hintgv) = MUTABLE_HV(SSPOPPTR);
1041 if (!GvHV(PL_hintgv)) {
1042 /* Need to add a new one manually, else rv2hv can
1043 add one via GvHVn and it won't have the magic set. */
1044 HV *const hv = newHV();
1045 hv_magic(hv, NULL, PERL_MAGIC_hints);
1046 GvHV(PL_hintgv) = hv;
1048 assert(GvHV(PL_hintgv));
1051 PL_comppad = (PAD*)SSPOPPTR;
1053 PL_curpad = AvARRAY(PL_comppad);
1057 case SAVEt_PADSV_AND_MORTALIZE:
1059 const PADOFFSET off = (PADOFFSET)SSPOPLONG;
1063 svp = AvARRAY((PAD*)ptr) + off;
1064 /* This mortalizing used to be done by POPLOOP() via itersave.
1065 But as we have all the information here, we can do it here,
1066 save even having to have itersave in the struct. */
1068 *svp = MUTABLE_SV(SSPOPPTR);
1071 case SAVEt_SAVESWITCHSTACK:
1074 AV *const t = MUTABLE_AV(SSPOPPTR);
1075 AV *const f = MUTABLE_AV(SSPOPPTR);
1077 PL_curstackinfo->si_stack = f;
1080 case SAVEt_SET_SVFLAGS:
1082 const U32 val = (U32)SSPOPINT;
1083 const U32 mask = (U32)SSPOPINT;
1084 sv = MUTABLE_SV(SSPOPPTR);
1085 SvFLAGS(sv) &= ~mask;
1090 /* This would be a mathom, but Perl_save_svref() calls a static
1091 function, S_save_scalar_at(), so has to stay in this file. */
1092 case SAVEt_SVREF: /* scalar reference */
1093 value = MUTABLE_SV(SSPOPPTR);
1095 av = NULL; /* what to refcnt_dec */
1098 /* These are only saved in mathoms.c */
1100 gv = MUTABLE_GV(SSPOPPTR);
1101 (void)sv_clear(MUTABLE_SV(gv));
1103 case SAVEt_LONG: /* long reference */
1105 *(long*)ptr = (long)SSPOPLONG;
1107 case SAVEt_IV: /* IV reference */
1109 *(IV*)ptr = (IV)SSPOPIV;
1112 case SAVEt_I16: /* I16 reference */
1114 *(I16*)ptr = (I16)(uv >> 8);
1116 case SAVEt_I8: /* I8 reference */
1118 *(I8*)ptr = (I8)(uv >> 8);
1120 case SAVEt_DESTRUCTOR:
1124 case SAVEt_COMPILE_WARNINGS:
1127 if (!specialWARN(PL_compiling.cop_warnings))
1128 PerlMemShared_free(PL_compiling.cop_warnings);
1130 PL_compiling.cop_warnings = (STRLEN*)ptr;
1132 case SAVEt_RE_STATE:
1134 const struct re_save_state *const state
1135 = (struct re_save_state *)
1136 (PL_savestack + PL_savestack_ix
1137 - SAVESTACK_ALLOC_FOR_RE_SAVE_STATE);
1138 PL_savestack_ix -= SAVESTACK_ALLOC_FOR_RE_SAVE_STATE;
1140 if (PL_reg_poscache != state->re_state_reg_poscache) {
1141 Safefree(PL_reg_poscache);
1143 Copy(state, &PL_reg_state, 1, struct re_save_state);
1148 parser_free((yy_parser *) ptr);
1151 Perl_croak(aTHX_ "panic: leave_scope inconsistency %u", type);
1161 Perl_cx_dump(pTHX_ PERL_CONTEXT *cx)
1165 PERL_ARGS_ASSERT_CX_DUMP;
1168 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]);
1169 if (CxTYPE(cx) != CXt_SUBST) {
1170 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
1171 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%"UVxf"\n",
1172 PTR2UV(cx->blk_oldcop));
1173 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
1174 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
1175 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%"UVxf"\n",
1176 PTR2UV(cx->blk_oldpm));
1177 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
1179 switch (CxTYPE(cx)) {
1184 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.CV = 0x%"UVxf"\n",
1185 PTR2UV(cx->blk_format.cv));
1186 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.GV = 0x%"UVxf"\n",
1187 PTR2UV(cx->blk_format.gv));
1188 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.DFOUTGV = 0x%"UVxf"\n",
1189 PTR2UV(cx->blk_format.dfoutgv));
1190 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.HASARGS = %d\n",
1191 (int)CxHASARGS(cx));
1192 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.RETOP = 0x%"UVxf"\n",
1193 PTR2UV(cx->blk_format.retop));
1196 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%"UVxf"\n",
1197 PTR2UV(cx->blk_sub.cv));
1198 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
1199 (long)cx->blk_sub.olddepth);
1200 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
1201 (int)CxHASARGS(cx));
1202 PerlIO_printf(Perl_debug_log, "BLK_SUB.LVAL = %d\n", (int)CxLVAL(cx));
1203 PerlIO_printf(Perl_debug_log, "BLK_SUB.RETOP = 0x%"UVxf"\n",
1204 PTR2UV(cx->blk_sub.retop));
1207 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
1208 (long)CxOLD_IN_EVAL(cx));
1209 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
1210 PL_op_name[CxOLD_OP_TYPE(cx)],
1211 PL_op_desc[CxOLD_OP_TYPE(cx)]);
1212 if (cx->blk_eval.old_namesv)
1213 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
1214 SvPVX_const(cx->blk_eval.old_namesv));
1215 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%"UVxf"\n",
1216 PTR2UV(cx->blk_eval.old_eval_root));
1217 PerlIO_printf(Perl_debug_log, "BLK_EVAL.RETOP = 0x%"UVxf"\n",
1218 PTR2UV(cx->blk_eval.retop));
1221 case CXt_LOOP_LAZYIV:
1222 case CXt_LOOP_LAZYSV:
1224 case CXt_LOOP_PLAIN:
1225 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n", CxLABEL(cx));
1226 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
1227 (long)cx->blk_loop.resetsp);
1228 PerlIO_printf(Perl_debug_log, "BLK_LOOP.MY_OP = 0x%"UVxf"\n",
1229 PTR2UV(cx->blk_loop.my_op));
1230 /* XXX: not accurate for LAZYSV/IV */
1231 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%"UVxf"\n",
1232 PTR2UV(cx->blk_loop.state_u.ary.ary));
1233 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
1234 (long)cx->blk_loop.state_u.ary.ix);
1235 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%"UVxf"\n",
1236 PTR2UV(CxITERVAR(cx)));
1240 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
1241 (long)cx->sb_iters);
1242 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
1243 (long)cx->sb_maxiters);
1244 PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n",
1245 (long)cx->sb_rflags);
1246 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
1248 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
1250 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%"UVxf"\n",
1251 PTR2UV(cx->sb_dstr));
1252 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%"UVxf"\n",
1253 PTR2UV(cx->sb_targ));
1254 PerlIO_printf(Perl_debug_log, "SB_S = 0x%"UVxf"\n",
1256 PerlIO_printf(Perl_debug_log, "SB_M = 0x%"UVxf"\n",
1258 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%"UVxf"\n",
1259 PTR2UV(cx->sb_strend));
1260 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%"UVxf"\n",
1261 PTR2UV(cx->sb_rxres));
1265 PERL_UNUSED_CONTEXT;
1266 PERL_UNUSED_ARG(cx);
1267 #endif /* DEBUGGING */
1272 * c-indentation-style: bsd
1274 * indent-tabs-mode: nil
1277 * ex: set ts=8 sts=4 sw=4 et: