3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
12 * For the fashion of Minas Tirith was such that it was built on seven
15 * [p.751 of _The Lord of the Rings_, V/i: "Minas Tirith"]
18 /* This file contains functions to manipulate several of Perl's stacks;
19 * in particular it contains code to push various types of things onto
20 * the savestack, then to pop them off and perform the correct restorative
21 * action for each one. This corresponds to the cleanup Perl does at
26 #define PERL_IN_SCOPE_C
30 Perl_stack_grow(pTHX_ SV **sp, SV **p, int n)
34 PERL_ARGS_ASSERT_STACK_GROW;
37 #ifndef STRESS_REALLOC
38 av_extend(PL_curstack, (p - PL_stack_base) + (n) + 128);
40 av_extend(PL_curstack, (p - PL_stack_base) + (n) + 1);
45 #ifndef STRESS_REALLOC
46 #define GROW(old) ((old) * 3 / 2)
48 #define GROW(old) ((old) + 1)
52 Perl_new_stackinfo(pTHX_ I32 stitems, I32 cxitems)
57 si->si_stack = newAV();
58 AvREAL_off(si->si_stack);
59 av_extend(si->si_stack, stitems > 0 ? stitems-1 : 0);
60 AvALLOC(si->si_stack)[0] = &PL_sv_undef;
61 AvFILLp(si->si_stack) = 0;
64 si->si_cxmax = cxitems - 1;
66 si->si_type = PERLSI_UNDEF;
67 Newx(si->si_cxstack, cxitems, PERL_CONTEXT);
68 /* Without any kind of initialising PUSHSUBST()
69 * in pp_subst() will read uninitialised heap. */
70 PoisonNew(si->si_cxstack, cxitems, PERL_CONTEXT);
78 const IV old_max = cxstack_max;
79 cxstack_max = GROW(cxstack_max);
80 Renew(cxstack, cxstack_max + 1, PERL_CONTEXT);
81 /* Without any kind of initialising deep enough recursion
82 * will end up reading uninitialised PERL_CONTEXTs. */
83 PoisonNew(cxstack + old_max + 1, cxstack_max - old_max, PERL_CONTEXT);
84 return cxstack_ix + 1;
91 if (PL_scopestack_ix == PL_scopestack_max) {
92 PL_scopestack_max = GROW(PL_scopestack_max);
93 Renew(PL_scopestack, PL_scopestack_max, I32);
95 Renew(PL_scopestack_name, PL_scopestack_max, const char*);
99 PL_scopestack_name[PL_scopestack_ix] = "unknown";
101 PL_scopestack[PL_scopestack_ix++] = PL_savestack_ix;
109 const I32 oldsave = PL_scopestack[--PL_scopestack_ix];
110 LEAVE_SCOPE(oldsave);
114 Perl_markstack_grow(pTHX)
117 const I32 oldmax = PL_markstack_max - PL_markstack;
118 const I32 newmax = GROW(oldmax);
120 Renew(PL_markstack, newmax, I32);
121 PL_markstack_ptr = PL_markstack + oldmax;
122 PL_markstack_max = PL_markstack + newmax;
126 Perl_savestack_grow(pTHX)
129 PL_savestack_max = GROW(PL_savestack_max) + 4;
130 Renew(PL_savestack, PL_savestack_max, ANY);
134 Perl_savestack_grow_cnt(pTHX_ I32 need)
137 PL_savestack_max = PL_savestack_ix + need;
138 Renew(PL_savestack, PL_savestack_max, ANY);
144 Perl_tmps_grow(pTHX_ I32 n)
147 #ifndef STRESS_REALLOC
149 n = (PL_tmps_max < 512) ? 128 : 512;
151 PL_tmps_max = PL_tmps_ix + n + 1;
152 Renew(PL_tmps_stack, PL_tmps_max, SV*);
160 /* XXX should tmps_floor live in cxstack? */
161 const I32 myfloor = PL_tmps_floor;
162 while (PL_tmps_ix > myfloor) { /* clean up after last statement */
163 SV* const sv = PL_tmps_stack[PL_tmps_ix];
164 PL_tmps_stack[PL_tmps_ix--] = NULL;
165 if (sv && sv != &PL_sv_undef) {
167 SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */
173 S_save_scalar_at(pTHX_ SV **sptr, const U32 flags)
179 PERL_ARGS_ASSERT_SAVE_SCALAR_AT;
182 sv = (flags & SAVEf_KEEPOLDELEM) ? osv : (*sptr = newSV(0));
184 if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
185 if (SvGMAGICAL(osv)) {
186 SvFLAGS(osv) |= (SvFLAGS(osv) &
187 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
189 if (!(flags & SAVEf_KEEPOLDELEM))
190 mg_localize(osv, sv, 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 save_pushptri32ptr(GvHV(PL_hintgv), PL_hints, save_cophh, SAVEt_HINTS);
598 GvHV(PL_hintgv) = hv_copy_hints_hv(GvHV(PL_hintgv));
600 save_pushi32ptr(PL_hints, save_cophh, SAVEt_HINTS);
605 S_save_pushptri32ptr(pTHX_ void *const ptr1, const I32 i, void *const ptr2,
616 Perl_save_aelem_flags(pTHX_ AV *av, I32 idx, SV **sptr, const U32 flags)
621 PERL_ARGS_ASSERT_SAVE_AELEM_FLAGS;
624 save_pushptri32ptr(SvREFCNT_inc_simple(av), idx, SvREFCNT_inc(*sptr),
626 /* if it gets reified later, the restore will have the wrong refcnt */
627 if (!AvREAL(av) && AvREIFY(av))
628 SvREFCNT_inc_void(*sptr);
629 save_scalar_at(sptr, flags); /* XXX - FIXME - see #60360 */
630 if (flags & SAVEf_KEEPOLDELEM)
633 /* If we're localizing a tied array element, this new sv
634 * won't actually be stored in the array - so it won't get
635 * reaped when the localize ends. Ensure it gets reaped by
636 * mortifying it instead. DAPM */
637 if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied))
642 Perl_save_helem_flags(pTHX_ HV *hv, SV *key, SV **sptr, const U32 flags)
647 PERL_ARGS_ASSERT_SAVE_HELEM_FLAGS;
651 SSPUSHPTR(SvREFCNT_inc_simple(hv));
652 SSPUSHPTR(newSVsv(key));
653 SSPUSHPTR(SvREFCNT_inc(*sptr));
654 SSPUSHUV(SAVEt_HELEM);
655 save_scalar_at(sptr, flags);
656 if (flags & SAVEf_KEEPOLDELEM)
659 /* If we're localizing a tied hash element, this new sv
660 * won't actually be stored in the hash - so it won't get
661 * reaped when the localize ends. Ensure it gets reaped by
662 * mortifying it instead. DAPM */
663 if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
668 Perl_save_svref(pTHX_ SV **sptr)
672 PERL_ARGS_ASSERT_SAVE_SVREF;
675 save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_SVREF);
676 return save_scalar_at(sptr, SAVEf_SETMAGIC); /* XXX - FIXME - see #60360 */
680 Perl_save_alloc(pTHX_ I32 size, I32 pad)
683 register const I32 start = pad + ((char*)&PL_savestack[PL_savestack_ix]
684 - (char*)PL_savestack);
685 const UV elems = 1 + ((size + pad - 1) / sizeof(*PL_savestack));
686 const UV elems_shifted = elems << SAVE_TIGHT_SHIFT;
688 if ((elems_shifted >> SAVE_TIGHT_SHIFT) != elems)
689 Perl_croak(aTHX_ "panic: save_alloc elems %"UVuf" out of range (%ld-%ld)",
694 PL_savestack_ix += elems;
695 SSPUSHUV(SAVEt_ALLOC | elems_shifted);
700 Perl_leave_scope(pTHX_ I32 base)
711 /* Localise the effects of the TAINT_NOT inside the loop. */
712 const bool was = PL_tainted;
715 Perl_croak(aTHX_ "panic: corrupt saved stack index");
716 DEBUG_l(Perl_deb(aTHX_ "savestack: releasing items %ld -> %ld\n",
717 (long)PL_savestack_ix, (long)base));
718 while (PL_savestack_ix > base) {
720 const U8 type = (U8)uv & SAVE_MASK;
724 case SAVEt_ITEM: /* normal string */
725 value = MUTABLE_SV(SSPOPPTR);
726 sv = MUTABLE_SV(SSPOPPTR);
727 sv_replace(sv,value);
732 case SAVEt_SV: /* scalar reference */
733 value = MUTABLE_SV(SSPOPPTR);
734 gv = MUTABLE_GV(SSPOPPTR);
736 av = MUTABLE_AV(gv); /* what to refcnt_dec */
745 SvREFCNT_dec(av); /* av may actually be an AV, HV or GV */
747 case SAVEt_GENERIC_PVREF: /* generic pv */
749 str = (char*)SSPOPPTR;
750 if (*(char**)ptr != str) {
751 Safefree(*(char**)ptr);
755 case SAVEt_SHARED_PVREF: /* shared pv */
756 str = (char*)SSPOPPTR;
758 if (*(char**)ptr != str) {
760 PerlMem_free(*(char**)ptr);
762 PerlMemShared_free(*(char**)ptr);
767 case SAVEt_GVSV: /* scalar slot in GV */
768 value = MUTABLE_SV(SSPOPPTR);
769 gv = MUTABLE_GV(SSPOPPTR);
772 case SAVEt_GENERIC_SVREF: /* generic sv */
773 value = MUTABLE_SV(SSPOPPTR);
781 case SAVEt_AV: /* array reference */
782 av = MUTABLE_AV(SSPOPPTR);
783 gv = MUTABLE_GV(SSPOPPTR);
784 SvREFCNT_dec(GvAV(gv));
788 SvSETMAGIC(MUTABLE_SV(av));
793 case SAVEt_HV: /* hash reference */
794 hv = MUTABLE_HV(SSPOPPTR);
795 gv = MUTABLE_GV(SSPOPPTR);
796 SvREFCNT_dec(GvHV(gv));
800 SvSETMAGIC(MUTABLE_SV(hv));
805 case SAVEt_INT_SMALL:
807 *(int*)ptr = (int)(uv >> SAVE_TIGHT_SHIFT);
809 case SAVEt_INT: /* int reference */
811 *(int*)ptr = (int)SSPOPINT;
813 case SAVEt_BOOL: /* bool reference */
815 *(bool*)ptr = cBOOL(uv >> 8);
817 case SAVEt_I32_SMALL:
819 *(I32*)ptr = (I32)(uv >> SAVE_TIGHT_SHIFT);
821 case SAVEt_I32: /* I32 reference */
823 #ifdef PERL_DEBUG_READONLY_OPS
825 const I32 val = SSPOPINT;
826 if (*(I32*)ptr != val)
830 *(I32*)ptr = (I32)SSPOPINT;
833 case SAVEt_SPTR: /* SV* reference */
835 *(SV**)ptr = MUTABLE_SV(SSPOPPTR);
837 case SAVEt_VPTR: /* random* reference */
838 case SAVEt_PPTR: /* char* reference */
840 *(char**)ptr = (char*)SSPOPPTR;
842 case SAVEt_HPTR: /* HV* reference */
844 *(HV**)ptr = MUTABLE_HV(SSPOPPTR);
846 case SAVEt_APTR: /* AV* reference */
848 *(AV**)ptr = MUTABLE_AV(SSPOPPTR);
850 case SAVEt_GP: /* scalar reference */
852 gv = MUTABLE_GV(SSPOPPTR);
854 GvGP_set(gv, (GP*)ptr);
855 /* putting a method back into circulation ("local")*/
856 if (GvCVu(gv) && (hv=GvSTASH(gv)) && HvENAME_get(hv))
857 mro_method_changed_in(hv);
862 SvREFCNT_dec(MUTABLE_SV(ptr));
864 case SAVEt_FREECOPHH:
866 cophh_free((COPHH *)ptr);
868 case SAVEt_MORTALIZESV:
870 sv_2mortal(MUTABLE_SV(ptr));
874 ASSERT_CURPAD_LEGAL("SAVEt_FREEOP"); /* XXX DAPM tmp */
882 ptr = (void*)&PL_curpad[uv >> SAVE_TIGHT_SHIFT];
885 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
886 "Pad 0x%"UVxf"[0x%"UVxf"] clearsv: %ld sv=0x%"UVxf"<%"IVdf"> %s\n",
887 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
888 (long)((SV **)ptr-PL_curpad), PTR2UV(sv), (IV)SvREFCNT(sv),
889 (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) ? "clear" : "abandon"
892 /* Can clear pad variable in place? */
893 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
895 * if a my variable that was made readonly is going out of
896 * scope, we want to remove the readonlyness so that it can
897 * go out of scope quietly
899 if (SvPADMY(sv) && !SvFAKE(sv))
902 if (SvTHINKFIRST(sv))
903 sv_force_normal_flags(sv, SV_IMMEDIATE_UNREF);
907 switch (SvTYPE(sv)) {
911 av_clear(MUTABLE_AV(sv));
914 hv_clear(MUTABLE_HV(sv));
917 Perl_croak(aTHX_ "panic: leave_scope pad code");
922 SvPADSTALE_on(sv); /* mark as no longer live */
924 else { /* Someone has a claim on this, so abandon it. */
925 const U32 padflags = SvFLAGS(sv) & (SVs_PADMY|SVs_PADTMP);
926 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
927 case SVt_PVAV: *(SV**)ptr = MUTABLE_SV(newAV()); break;
928 case SVt_PVHV: *(SV**)ptr = MUTABLE_SV(newHV()); break;
929 default: *(SV**)ptr = newSV(0); break;
931 SvREFCNT_dec(sv); /* Cast current value to the winds. */
932 /* preserve pad nature, but also mark as not live
933 * for any closure capturing */
934 SvFLAGS(*(SV**)ptr) |= padflags | SVs_PADSTALE;
939 hv = MUTABLE_HV(ptr);
942 (void)hv_delete(hv, (char*)ptr, i, G_DISCARD);
948 av = MUTABLE_AV(ptr);
950 (void)av_delete(av, i, G_DISCARD);
953 case SAVEt_DESTRUCTOR_X:
955 (*SSPOPDXPTR)(aTHX_ ptr);
957 case SAVEt_REGCONTEXT:
958 /* regexp must have croaked */
960 PL_savestack_ix -= uv >> SAVE_TIGHT_SHIFT;
962 case SAVEt_STACK_POS: /* Position on Perl stack */
964 PL_stack_sp = PL_stack_base + i;
966 case SAVEt_STACK_CXPOS: /* blk_oldsp on context stack */
968 cxstack[i].blk_oldsp = SSPOPINT;
970 case SAVEt_AELEM: /* array element */
971 value = MUTABLE_SV(SSPOPPTR);
973 av = MUTABLE_AV(SSPOPPTR);
974 ptr = av_fetch(av,i,1);
975 if (!AvREAL(av) && AvREIFY(av)) /* undo reify guard */
979 if (sv && sv != &PL_sv_undef) {
980 if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied))
981 SvREFCNT_inc_void_NN(sv);
988 case SAVEt_HELEM: /* hash element */
989 value = MUTABLE_SV(SSPOPPTR);
990 sv = MUTABLE_SV(SSPOPPTR);
991 hv = MUTABLE_HV(SSPOPPTR);
992 ptr = hv_fetch_ent(hv, sv, 1, 0);
995 const SV * const oval = HeVAL((HE*)ptr);
996 if (oval && oval != &PL_sv_undef) {
997 ptr = &HeVAL((HE*)ptr);
998 if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
999 SvREFCNT_inc_void(*(SV**)ptr);
1000 av = MUTABLE_AV(hv); /* what to refcnt_dec */
1005 SvREFCNT_dec(value);
1008 PL_op = (OP*)SSPOPPTR;
1011 if ((PL_hints & HINT_LOCALIZE_HH) && GvHV(PL_hintgv)) {
1012 SvREFCNT_dec(MUTABLE_SV(GvHV(PL_hintgv)));
1013 GvHV(PL_hintgv) = NULL;
1015 cophh_free(CopHINTHASH_get(&PL_compiling));
1016 CopHINTHASH_set(&PL_compiling, (COPHH*)SSPOPPTR);
1017 *(I32*)&PL_hints = (I32)SSPOPINT;
1018 if (PL_hints & HINT_LOCALIZE_HH) {
1019 SvREFCNT_dec(MUTABLE_SV(GvHV(PL_hintgv)));
1020 GvHV(PL_hintgv) = MUTABLE_HV(SSPOPPTR);
1021 assert(GvHV(PL_hintgv));
1022 } else if (!GvHV(PL_hintgv)) {
1023 /* Need to add a new one manually, else gv_fetchpv() can
1024 add one in this code:
1026 if (SvTYPE(gv) == SVt_PVGV) {
1029 gv_init_sv(gv, sv_type);
1030 if (*name=='!' && sv_type == SVt_PVHV && len==1)
1036 and it won't have the magic set. */
1038 HV *const hv = newHV();
1039 hv_magic(hv, NULL, PERL_MAGIC_hints);
1040 GvHV(PL_hintgv) = hv;
1042 assert(GvHV(PL_hintgv));
1045 PL_comppad = (PAD*)SSPOPPTR;
1047 PL_curpad = AvARRAY(PL_comppad);
1051 case SAVEt_PADSV_AND_MORTALIZE:
1053 const PADOFFSET off = (PADOFFSET)SSPOPLONG;
1057 svp = AvARRAY((PAD*)ptr) + off;
1058 /* This mortalizing used to be done by POPLOOP() via itersave.
1059 But as we have all the information here, we can do it here,
1060 save even having to have itersave in the struct. */
1062 *svp = MUTABLE_SV(SSPOPPTR);
1065 case SAVEt_SAVESWITCHSTACK:
1068 AV *const t = MUTABLE_AV(SSPOPPTR);
1069 AV *const f = MUTABLE_AV(SSPOPPTR);
1071 PL_curstackinfo->si_stack = f;
1074 case SAVEt_SET_SVFLAGS:
1076 const U32 val = (U32)SSPOPINT;
1077 const U32 mask = (U32)SSPOPINT;
1078 sv = MUTABLE_SV(SSPOPPTR);
1079 SvFLAGS(sv) &= ~mask;
1084 /* This would be a mathom, but Perl_save_svref() calls a static
1085 function, S_save_scalar_at(), so has to stay in this file. */
1086 case SAVEt_SVREF: /* scalar reference */
1087 value = MUTABLE_SV(SSPOPPTR);
1089 av = NULL; /* what to refcnt_dec */
1092 /* These are only saved in mathoms.c */
1094 gv = MUTABLE_GV(SSPOPPTR);
1095 (void)sv_clear(MUTABLE_SV(gv));
1097 case SAVEt_LONG: /* long reference */
1099 *(long*)ptr = (long)SSPOPLONG;
1101 case SAVEt_IV: /* IV reference */
1103 *(IV*)ptr = (IV)SSPOPIV;
1106 case SAVEt_I16: /* I16 reference */
1108 *(I16*)ptr = (I16)(uv >> 8);
1110 case SAVEt_I8: /* I8 reference */
1112 *(I8*)ptr = (I8)(uv >> 8);
1114 case SAVEt_DESTRUCTOR:
1118 case SAVEt_COMPILE_WARNINGS:
1121 if (!specialWARN(PL_compiling.cop_warnings))
1122 PerlMemShared_free(PL_compiling.cop_warnings);
1124 PL_compiling.cop_warnings = (STRLEN*)ptr;
1126 case SAVEt_RE_STATE:
1128 const struct re_save_state *const state
1129 = (struct re_save_state *)
1130 (PL_savestack + PL_savestack_ix
1131 - SAVESTACK_ALLOC_FOR_RE_SAVE_STATE);
1132 PL_savestack_ix -= SAVESTACK_ALLOC_FOR_RE_SAVE_STATE;
1134 if (PL_reg_start_tmp != state->re_state_reg_start_tmp) {
1135 Safefree(PL_reg_start_tmp);
1137 if (PL_reg_poscache != state->re_state_reg_poscache) {
1138 Safefree(PL_reg_poscache);
1140 Copy(state, &PL_reg_state, 1, struct re_save_state);
1145 parser_free((yy_parser *) ptr);
1148 Perl_croak(aTHX_ "panic: leave_scope inconsistency");
1158 Perl_cx_dump(pTHX_ PERL_CONTEXT *cx)
1162 PERL_ARGS_ASSERT_CX_DUMP;
1165 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]);
1166 if (CxTYPE(cx) != CXt_SUBST) {
1167 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
1168 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%"UVxf"\n",
1169 PTR2UV(cx->blk_oldcop));
1170 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
1171 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
1172 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%"UVxf"\n",
1173 PTR2UV(cx->blk_oldpm));
1174 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
1176 switch (CxTYPE(cx)) {
1181 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.CV = 0x%"UVxf"\n",
1182 PTR2UV(cx->blk_format.cv));
1183 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.GV = 0x%"UVxf"\n",
1184 PTR2UV(cx->blk_format.gv));
1185 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.DFOUTGV = 0x%"UVxf"\n",
1186 PTR2UV(cx->blk_format.dfoutgv));
1187 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.HASARGS = %d\n",
1188 (int)CxHASARGS(cx));
1189 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.RETOP = 0x%"UVxf"\n",
1190 PTR2UV(cx->blk_format.retop));
1193 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%"UVxf"\n",
1194 PTR2UV(cx->blk_sub.cv));
1195 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
1196 (long)cx->blk_sub.olddepth);
1197 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
1198 (int)CxHASARGS(cx));
1199 PerlIO_printf(Perl_debug_log, "BLK_SUB.LVAL = %d\n", (int)CxLVAL(cx));
1200 PerlIO_printf(Perl_debug_log, "BLK_SUB.RETOP = 0x%"UVxf"\n",
1201 PTR2UV(cx->blk_sub.retop));
1204 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
1205 (long)CxOLD_IN_EVAL(cx));
1206 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
1207 PL_op_name[CxOLD_OP_TYPE(cx)],
1208 PL_op_desc[CxOLD_OP_TYPE(cx)]);
1209 if (cx->blk_eval.old_namesv)
1210 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
1211 SvPVX_const(cx->blk_eval.old_namesv));
1212 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%"UVxf"\n",
1213 PTR2UV(cx->blk_eval.old_eval_root));
1214 PerlIO_printf(Perl_debug_log, "BLK_EVAL.RETOP = 0x%"UVxf"\n",
1215 PTR2UV(cx->blk_eval.retop));
1218 case CXt_LOOP_LAZYIV:
1219 case CXt_LOOP_LAZYSV:
1221 case CXt_LOOP_PLAIN:
1222 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n", CxLABEL(cx));
1223 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
1224 (long)cx->blk_loop.resetsp);
1225 PerlIO_printf(Perl_debug_log, "BLK_LOOP.MY_OP = 0x%"UVxf"\n",
1226 PTR2UV(cx->blk_loop.my_op));
1227 /* XXX: not accurate for LAZYSV/IV */
1228 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%"UVxf"\n",
1229 PTR2UV(cx->blk_loop.state_u.ary.ary));
1230 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
1231 (long)cx->blk_loop.state_u.ary.ix);
1232 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%"UVxf"\n",
1233 PTR2UV(CxITERVAR(cx)));
1237 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
1238 (long)cx->sb_iters);
1239 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
1240 (long)cx->sb_maxiters);
1241 PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n",
1242 (long)cx->sb_rflags);
1243 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
1245 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
1247 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%"UVxf"\n",
1248 PTR2UV(cx->sb_dstr));
1249 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%"UVxf"\n",
1250 PTR2UV(cx->sb_targ));
1251 PerlIO_printf(Perl_debug_log, "SB_S = 0x%"UVxf"\n",
1253 PerlIO_printf(Perl_debug_log, "SB_M = 0x%"UVxf"\n",
1255 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%"UVxf"\n",
1256 PTR2UV(cx->sb_strend));
1257 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%"UVxf"\n",
1258 PTR2UV(cx->sb_rxres));
1262 PERL_UNUSED_CONTEXT;
1263 PERL_UNUSED_ARG(cx);
1264 #endif /* DEBUGGING */
1269 * c-indentation-style: bsd
1271 * indent-tabs-mode: t
1274 * ex: set ts=8 sts=4 sw=4 noet: