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(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;
337 save_pushptrptr(gv, (ohv = GvHVn(gv)), SAVEt_HV);
342 mg_localize(MUTABLE_SV(ohv), MUTABLE_SV(hv), TRUE);
347 Perl_save_item(pTHX_ register SV *item)
350 register SV * const sv = newSVsv(item);
352 PERL_ARGS_ASSERT_SAVE_ITEM;
354 save_pushptrptr(item, /* remember the pointer */
355 sv, /* remember the value */
360 Perl_save_bool(pTHX_ bool *boolp)
364 PERL_ARGS_ASSERT_SAVE_BOOL;
368 SSPUSHUV(SAVEt_BOOL | (*boolp << 8));
372 Perl_save_pushi32ptr(pTHX_ const I32 i, void *const ptr, const int type)
382 Perl_save_int(pTHX_ int *intp)
385 const UV shifted = (UV)*intp << SAVE_TIGHT_SHIFT;
387 PERL_ARGS_ASSERT_SAVE_INT;
389 if ((int)(shifted >> SAVE_TIGHT_SHIFT) == *intp) {
392 SSPUSHUV(SAVEt_INT_SMALL | shifted);
394 save_pushi32ptr(*intp, intp, SAVEt_INT);
398 Perl_save_I8(pTHX_ I8 *bytep)
402 PERL_ARGS_ASSERT_SAVE_I8;
406 SSPUSHUV(SAVEt_I8 | ((UV)*bytep << 8));
410 Perl_save_I16(pTHX_ I16 *intp)
414 PERL_ARGS_ASSERT_SAVE_I16;
418 SSPUSHUV(SAVEt_I16 | ((UV)*intp << 8));
422 Perl_save_I32(pTHX_ I32 *intp)
425 const UV shifted = (UV)*intp << SAVE_TIGHT_SHIFT;
427 PERL_ARGS_ASSERT_SAVE_I32;
429 if ((I32)(shifted >> SAVE_TIGHT_SHIFT) == *intp) {
432 SSPUSHUV(SAVEt_I32_SMALL | shifted);
434 save_pushi32ptr(*intp, intp, SAVEt_I32);
437 /* Cannot use save_sptr() to store a char* since the SV** cast will
438 * force word-alignment and we'll miss the pointer.
441 Perl_save_pptr(pTHX_ char **pptr)
445 PERL_ARGS_ASSERT_SAVE_PPTR;
447 save_pushptrptr(*pptr, pptr, SAVEt_PPTR);
451 Perl_save_vptr(pTHX_ void *ptr)
455 PERL_ARGS_ASSERT_SAVE_VPTR;
457 save_pushptrptr(*(char**)ptr, ptr, SAVEt_VPTR);
461 Perl_save_sptr(pTHX_ SV **sptr)
465 PERL_ARGS_ASSERT_SAVE_SPTR;
467 save_pushptrptr(*sptr, sptr, SAVEt_SPTR);
471 Perl_save_padsv_and_mortalize(pTHX_ PADOFFSET off)
475 ASSERT_CURPAD_ACTIVE("save_padsv");
476 SSPUSHPTR(SvREFCNT_inc_simple_NN(PL_curpad[off]));
477 SSPUSHPTR(PL_comppad);
478 SSPUSHLONG((long)off);
479 SSPUSHUV(SAVEt_PADSV_AND_MORTALIZE);
483 Perl_save_hptr(pTHX_ HV **hptr)
487 PERL_ARGS_ASSERT_SAVE_HPTR;
489 save_pushptrptr(*hptr, hptr, SAVEt_HPTR);
493 Perl_save_aptr(pTHX_ AV **aptr)
497 PERL_ARGS_ASSERT_SAVE_APTR;
499 save_pushptrptr(*aptr, aptr, SAVEt_APTR);
503 Perl_save_pushptr(pTHX_ void *const ptr, const int type)
512 Perl_save_clearsv(pTHX_ SV **svp)
515 const UV offset = svp - PL_curpad;
516 const UV offset_shifted = offset << SAVE_TIGHT_SHIFT;
518 PERL_ARGS_ASSERT_SAVE_CLEARSV;
520 ASSERT_CURPAD_ACTIVE("save_clearsv");
521 if ((offset_shifted >> SAVE_TIGHT_SHIFT) != offset)
522 Perl_croak(aTHX_ "panic: pad offset %"UVuf" out of range (%p-%p)",
523 offset, svp, PL_curpad);
526 SSPUSHUV(offset_shifted | SAVEt_CLEARSV);
527 SvPADSTALE_off(*svp); /* mark lexical as active */
531 Perl_save_delete(pTHX_ HV *hv, char *key, I32 klen)
535 PERL_ARGS_ASSERT_SAVE_DELETE;
537 save_pushptri32ptr(key, klen, SvREFCNT_inc_simple(hv), SAVEt_DELETE);
541 Perl_save_hdelete(pTHX_ HV *hv, SV *keysv)
547 PERL_ARGS_ASSERT_SAVE_HDELETE;
549 key = SvPV_const(keysv, len);
550 klen = SvUTF8(keysv) ? -(I32)len : (I32)len;
551 SvREFCNT_inc_simple_void_NN(hv);
552 save_pushptri32ptr(savepvn(key, len), klen, hv, SAVEt_DELETE);
556 Perl_save_adelete(pTHX_ AV *av, I32 key)
560 PERL_ARGS_ASSERT_SAVE_ADELETE;
562 SvREFCNT_inc_void(av);
563 save_pushi32ptr(key, av, SAVEt_ADELETE);
567 Perl_save_destructor(pTHX_ DESTRUCTORFUNC_NOCONTEXT_t f, void* p)
571 PERL_ARGS_ASSERT_SAVE_DESTRUCTOR;
576 SSPUSHUV(SAVEt_DESTRUCTOR);
580 Perl_save_destructor_x(pTHX_ DESTRUCTORFUNC_t f, void* p)
586 SSPUSHUV(SAVEt_DESTRUCTOR_X);
590 Perl_save_hints(pTHX)
593 COPHH *save_cophh = cophh_copy(CopHINTHASH_get(&PL_compiling));
594 if (PL_hints & HINT_LOCALIZE_HH) {
595 save_pushptri32ptr(GvHV(PL_hintgv), PL_hints, save_cophh, SAVEt_HINTS);
596 GvHV(PL_hintgv) = hv_copy_hints_hv(GvHV(PL_hintgv));
598 save_pushi32ptr(PL_hints, save_cophh, SAVEt_HINTS);
603 S_save_pushptri32ptr(pTHX_ void *const ptr1, const I32 i, void *const ptr2,
614 Perl_save_aelem_flags(pTHX_ AV *av, I32 idx, SV **sptr, const U32 flags)
619 PERL_ARGS_ASSERT_SAVE_AELEM_FLAGS;
622 save_pushptri32ptr(SvREFCNT_inc_simple(av), idx, SvREFCNT_inc(*sptr),
624 /* if it gets reified later, the restore will have the wrong refcnt */
625 if (!AvREAL(av) && AvREIFY(av))
626 SvREFCNT_inc_void(*sptr);
627 save_scalar_at(sptr, flags); /* XXX - FIXME - see #60360 */
628 if (flags & SAVEf_KEEPOLDELEM)
631 /* If we're localizing a tied array element, this new sv
632 * won't actually be stored in the array - so it won't get
633 * reaped when the localize ends. Ensure it gets reaped by
634 * mortifying it instead. DAPM */
635 if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied))
640 Perl_save_helem_flags(pTHX_ HV *hv, SV *key, SV **sptr, const U32 flags)
645 PERL_ARGS_ASSERT_SAVE_HELEM_FLAGS;
649 SSPUSHPTR(SvREFCNT_inc_simple(hv));
650 SSPUSHPTR(newSVsv(key));
651 SSPUSHPTR(SvREFCNT_inc(*sptr));
652 SSPUSHUV(SAVEt_HELEM);
653 save_scalar_at(sptr, flags);
654 if (flags & SAVEf_KEEPOLDELEM)
657 /* If we're localizing a tied hash element, this new sv
658 * won't actually be stored in the hash - so it won't get
659 * reaped when the localize ends. Ensure it gets reaped by
660 * mortifying it instead. DAPM */
661 if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
666 Perl_save_svref(pTHX_ SV **sptr)
670 PERL_ARGS_ASSERT_SAVE_SVREF;
673 save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_SVREF);
674 return save_scalar_at(sptr, SAVEf_SETMAGIC); /* XXX - FIXME - see #60360 */
678 Perl_save_alloc(pTHX_ I32 size, I32 pad)
681 register const I32 start = pad + ((char*)&PL_savestack[PL_savestack_ix]
682 - (char*)PL_savestack);
683 const UV elems = 1 + ((size + pad - 1) / sizeof(*PL_savestack));
684 const UV elems_shifted = elems << SAVE_TIGHT_SHIFT;
686 if ((elems_shifted >> SAVE_TIGHT_SHIFT) != elems)
687 Perl_croak(aTHX_ "panic: save_alloc elems %"UVuf" out of range (%ld-%ld)",
692 PL_savestack_ix += elems;
693 SSPUSHUV(SAVEt_ALLOC | elems_shifted);
698 Perl_leave_scope(pTHX_ I32 base)
709 /* Localise the effects of the TAINT_NOT inside the loop. */
710 const bool was = PL_tainted;
713 Perl_croak(aTHX_ "panic: corrupt saved stack index");
714 DEBUG_l(Perl_deb(aTHX_ "savestack: releasing items %ld -> %ld\n",
715 (long)PL_savestack_ix, (long)base));
716 while (PL_savestack_ix > base) {
718 const U8 type = (U8)uv & SAVE_MASK;
722 case SAVEt_ITEM: /* normal string */
723 value = MUTABLE_SV(SSPOPPTR);
724 sv = MUTABLE_SV(SSPOPPTR);
725 sv_replace(sv,value);
730 case SAVEt_SV: /* scalar reference */
731 value = MUTABLE_SV(SSPOPPTR);
732 gv = MUTABLE_GV(SSPOPPTR);
734 av = MUTABLE_AV(gv); /* what to refcnt_dec */
743 SvREFCNT_dec(av); /* av may actually be an AV, HV or GV */
745 case SAVEt_GENERIC_PVREF: /* generic pv */
747 str = (char*)SSPOPPTR;
748 if (*(char**)ptr != str) {
749 Safefree(*(char**)ptr);
753 case SAVEt_SHARED_PVREF: /* shared pv */
754 str = (char*)SSPOPPTR;
756 if (*(char**)ptr != str) {
758 PerlMem_free(*(char**)ptr);
760 PerlMemShared_free(*(char**)ptr);
765 case SAVEt_GVSV: /* scalar slot in GV */
766 value = MUTABLE_SV(SSPOPPTR);
767 gv = MUTABLE_GV(SSPOPPTR);
770 case SAVEt_GENERIC_SVREF: /* generic sv */
771 value = MUTABLE_SV(SSPOPPTR);
779 case SAVEt_AV: /* array reference */
780 av = MUTABLE_AV(SSPOPPTR);
781 gv = MUTABLE_GV(SSPOPPTR);
782 SvREFCNT_dec(GvAV(gv));
786 SvSETMAGIC(MUTABLE_SV(av));
790 case SAVEt_HV: /* hash reference */
791 hv = MUTABLE_HV(SSPOPPTR);
792 gv = MUTABLE_GV(SSPOPPTR);
793 SvREFCNT_dec(GvHV(gv));
797 SvSETMAGIC(MUTABLE_SV(hv));
801 case SAVEt_INT_SMALL:
803 *(int*)ptr = (int)(uv >> SAVE_TIGHT_SHIFT);
805 case SAVEt_INT: /* int reference */
807 *(int*)ptr = (int)SSPOPINT;
809 case SAVEt_BOOL: /* bool reference */
811 *(bool*)ptr = cBOOL(uv >> 8);
813 case SAVEt_I32_SMALL:
815 *(I32*)ptr = (I32)(uv >> SAVE_TIGHT_SHIFT);
817 case SAVEt_I32: /* I32 reference */
819 #ifdef PERL_DEBUG_READONLY_OPS
821 const I32 val = SSPOPINT;
822 if (*(I32*)ptr != val)
826 *(I32*)ptr = (I32)SSPOPINT;
829 case SAVEt_SPTR: /* SV* reference */
831 *(SV**)ptr = MUTABLE_SV(SSPOPPTR);
833 case SAVEt_VPTR: /* random* reference */
834 case SAVEt_PPTR: /* char* reference */
836 *(char**)ptr = (char*)SSPOPPTR;
838 case SAVEt_HPTR: /* HV* reference */
840 *(HV**)ptr = MUTABLE_HV(SSPOPPTR);
842 case SAVEt_APTR: /* AV* reference */
844 *(AV**)ptr = MUTABLE_AV(SSPOPPTR);
846 case SAVEt_GP: /* scalar reference */
848 gv = MUTABLE_GV(SSPOPPTR);
850 GvGP_set(gv, (GP*)ptr);
851 /* putting a method back into circulation ("local")*/
852 if (GvCVu(gv) && (hv=GvSTASH(gv)) && HvENAME_get(hv))
853 mro_method_changed_in(hv);
858 SvREFCNT_dec(MUTABLE_SV(ptr));
860 case SAVEt_FREECOPHH:
862 cophh_free((COPHH *)ptr);
864 case SAVEt_MORTALIZESV:
866 sv_2mortal(MUTABLE_SV(ptr));
870 ASSERT_CURPAD_LEGAL("SAVEt_FREEOP"); /* XXX DAPM tmp */
878 ptr = (void*)&PL_curpad[uv >> SAVE_TIGHT_SHIFT];
881 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
882 "Pad 0x%"UVxf"[0x%"UVxf"] clearsv: %ld sv=0x%"UVxf"<%"IVdf"> %s\n",
883 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
884 (long)((SV **)ptr-PL_curpad), PTR2UV(sv), (IV)SvREFCNT(sv),
885 (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) ? "clear" : "abandon"
888 /* Can clear pad variable in place? */
889 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
891 * if a my variable that was made readonly is going out of
892 * scope, we want to remove the readonlyness so that it can
893 * go out of scope quietly
895 if (SvPADMY(sv) && !SvFAKE(sv))
898 if (SvTHINKFIRST(sv))
899 sv_force_normal_flags(sv, SV_IMMEDIATE_UNREF);
903 switch (SvTYPE(sv)) {
907 av_clear(MUTABLE_AV(sv));
910 hv_clear(MUTABLE_HV(sv));
913 Perl_croak(aTHX_ "panic: leave_scope pad code");
918 SvPADSTALE_on(sv); /* mark as no longer live */
920 else { /* Someone has a claim on this, so abandon it. */
921 const U32 padflags = SvFLAGS(sv) & (SVs_PADMY|SVs_PADTMP);
922 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
923 case SVt_PVAV: *(SV**)ptr = MUTABLE_SV(newAV()); break;
924 case SVt_PVHV: *(SV**)ptr = MUTABLE_SV(newHV()); break;
925 default: *(SV**)ptr = newSV(0); break;
927 SvREFCNT_dec(sv); /* Cast current value to the winds. */
928 /* preserve pad nature, but also mark as not live
929 * for any closure capturing */
930 SvFLAGS(*(SV**)ptr) |= padflags | SVs_PADSTALE;
935 hv = MUTABLE_HV(ptr);
938 (void)hv_delete(hv, (char*)ptr, i, G_DISCARD);
944 av = MUTABLE_AV(ptr);
946 (void)av_delete(av, i, G_DISCARD);
949 case SAVEt_DESTRUCTOR_X:
951 (*SSPOPDXPTR)(aTHX_ ptr);
953 case SAVEt_REGCONTEXT:
954 /* regexp must have croaked */
956 PL_savestack_ix -= uv >> SAVE_TIGHT_SHIFT;
958 case SAVEt_STACK_POS: /* Position on Perl stack */
960 PL_stack_sp = PL_stack_base + i;
962 case SAVEt_STACK_CXPOS: /* blk_oldsp on context stack */
964 cxstack[i].blk_oldsp = SSPOPINT;
966 case SAVEt_AELEM: /* array element */
967 value = MUTABLE_SV(SSPOPPTR);
969 av = MUTABLE_AV(SSPOPPTR);
970 ptr = av_fetch(av,i,1);
971 if (!AvREAL(av) && AvREIFY(av)) /* undo reify guard */
975 if (sv && sv != &PL_sv_undef) {
976 if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied))
977 SvREFCNT_inc_void_NN(sv);
984 case SAVEt_HELEM: /* hash element */
985 value = MUTABLE_SV(SSPOPPTR);
986 sv = MUTABLE_SV(SSPOPPTR);
987 hv = MUTABLE_HV(SSPOPPTR);
988 ptr = hv_fetch_ent(hv, sv, 1, 0);
991 const SV * const oval = HeVAL((HE*)ptr);
992 if (oval && oval != &PL_sv_undef) {
993 ptr = &HeVAL((HE*)ptr);
994 if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
995 SvREFCNT_inc_void(*(SV**)ptr);
996 av = MUTABLE_AV(hv); /* what to refcnt_dec */
1001 SvREFCNT_dec(value);
1004 PL_op = (OP*)SSPOPPTR;
1007 if ((PL_hints & HINT_LOCALIZE_HH) && GvHV(PL_hintgv)) {
1008 SvREFCNT_dec(MUTABLE_SV(GvHV(PL_hintgv)));
1009 GvHV(PL_hintgv) = NULL;
1011 cophh_free(CopHINTHASH_get(&PL_compiling));
1012 CopHINTHASH_set(&PL_compiling, (COPHH*)SSPOPPTR);
1013 *(I32*)&PL_hints = (I32)SSPOPINT;
1014 if (PL_hints & HINT_LOCALIZE_HH) {
1015 SvREFCNT_dec(MUTABLE_SV(GvHV(PL_hintgv)));
1016 GvHV(PL_hintgv) = MUTABLE_HV(SSPOPPTR);
1017 assert(GvHV(PL_hintgv));
1018 } else if (!GvHV(PL_hintgv)) {
1019 /* Need to add a new one manually, else gv_fetchpv() can
1020 add one in this code:
1022 if (SvTYPE(gv) == SVt_PVGV) {
1025 gv_init_sv(gv, sv_type);
1026 if (*name=='!' && sv_type == SVt_PVHV && len==1)
1032 and it won't have the magic set. */
1034 HV *const hv = newHV();
1035 hv_magic(hv, NULL, PERL_MAGIC_hints);
1036 GvHV(PL_hintgv) = hv;
1038 assert(GvHV(PL_hintgv));
1041 PL_comppad = (PAD*)SSPOPPTR;
1043 PL_curpad = AvARRAY(PL_comppad);
1047 case SAVEt_PADSV_AND_MORTALIZE:
1049 const PADOFFSET off = (PADOFFSET)SSPOPLONG;
1053 svp = AvARRAY((PAD*)ptr) + off;
1054 /* This mortalizing used to be done by POPLOOP() via itersave.
1055 But as we have all the information here, we can do it here,
1056 save even having to have itersave in the struct. */
1058 *svp = MUTABLE_SV(SSPOPPTR);
1061 case SAVEt_SAVESWITCHSTACK:
1064 AV *const t = MUTABLE_AV(SSPOPPTR);
1065 AV *const f = MUTABLE_AV(SSPOPPTR);
1067 PL_curstackinfo->si_stack = f;
1070 case SAVEt_SET_SVFLAGS:
1072 const U32 val = (U32)SSPOPINT;
1073 const U32 mask = (U32)SSPOPINT;
1074 sv = MUTABLE_SV(SSPOPPTR);
1075 SvFLAGS(sv) &= ~mask;
1080 /* This would be a mathom, but Perl_save_svref() calls a static
1081 function, S_save_scalar_at(), so has to stay in this file. */
1082 case SAVEt_SVREF: /* scalar reference */
1083 value = MUTABLE_SV(SSPOPPTR);
1085 av = NULL; /* what to refcnt_dec */
1088 /* These are only saved in mathoms.c */
1090 gv = MUTABLE_GV(SSPOPPTR);
1091 (void)sv_clear(MUTABLE_SV(gv));
1093 case SAVEt_LONG: /* long reference */
1095 *(long*)ptr = (long)SSPOPLONG;
1097 case SAVEt_IV: /* IV reference */
1099 *(IV*)ptr = (IV)SSPOPIV;
1102 case SAVEt_I16: /* I16 reference */
1104 *(I16*)ptr = (I16)(uv >> 8);
1106 case SAVEt_I8: /* I8 reference */
1108 *(I8*)ptr = (I8)(uv >> 8);
1110 case SAVEt_DESTRUCTOR:
1114 case SAVEt_COP_ARYBASE:
1117 CopARYBASE_set((COP *)ptr, i);
1119 case SAVEt_COMPILE_WARNINGS:
1122 if (!specialWARN(PL_compiling.cop_warnings))
1123 PerlMemShared_free(PL_compiling.cop_warnings);
1125 PL_compiling.cop_warnings = (STRLEN*)ptr;
1127 case SAVEt_RE_STATE:
1129 const struct re_save_state *const state
1130 = (struct re_save_state *)
1131 (PL_savestack + PL_savestack_ix
1132 - SAVESTACK_ALLOC_FOR_RE_SAVE_STATE);
1133 PL_savestack_ix -= SAVESTACK_ALLOC_FOR_RE_SAVE_STATE;
1135 if (PL_reg_start_tmp != state->re_state_reg_start_tmp) {
1136 Safefree(PL_reg_start_tmp);
1138 if (PL_reg_poscache != state->re_state_reg_poscache) {
1139 Safefree(PL_reg_poscache);
1141 Copy(state, &PL_reg_state, 1, struct re_save_state);
1146 parser_free((yy_parser *) ptr);
1149 Perl_croak(aTHX_ "panic: leave_scope inconsistency");
1159 Perl_cx_dump(pTHX_ PERL_CONTEXT *cx)
1163 PERL_ARGS_ASSERT_CX_DUMP;
1166 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]);
1167 if (CxTYPE(cx) != CXt_SUBST) {
1168 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
1169 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%"UVxf"\n",
1170 PTR2UV(cx->blk_oldcop));
1171 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
1172 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
1173 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%"UVxf"\n",
1174 PTR2UV(cx->blk_oldpm));
1175 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
1177 switch (CxTYPE(cx)) {
1182 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.CV = 0x%"UVxf"\n",
1183 PTR2UV(cx->blk_format.cv));
1184 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.GV = 0x%"UVxf"\n",
1185 PTR2UV(cx->blk_format.gv));
1186 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.DFOUTGV = 0x%"UVxf"\n",
1187 PTR2UV(cx->blk_format.dfoutgv));
1188 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.HASARGS = %d\n",
1189 (int)CxHASARGS(cx));
1190 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.RETOP = 0x%"UVxf"\n",
1191 PTR2UV(cx->blk_format.retop));
1194 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%"UVxf"\n",
1195 PTR2UV(cx->blk_sub.cv));
1196 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
1197 (long)cx->blk_sub.olddepth);
1198 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
1199 (int)CxHASARGS(cx));
1200 PerlIO_printf(Perl_debug_log, "BLK_SUB.LVAL = %d\n", (int)CxLVAL(cx));
1201 PerlIO_printf(Perl_debug_log, "BLK_SUB.RETOP = 0x%"UVxf"\n",
1202 PTR2UV(cx->blk_sub.retop));
1205 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
1206 (long)CxOLD_IN_EVAL(cx));
1207 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
1208 PL_op_name[CxOLD_OP_TYPE(cx)],
1209 PL_op_desc[CxOLD_OP_TYPE(cx)]);
1210 if (cx->blk_eval.old_namesv)
1211 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
1212 SvPVX_const(cx->blk_eval.old_namesv));
1213 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%"UVxf"\n",
1214 PTR2UV(cx->blk_eval.old_eval_root));
1215 PerlIO_printf(Perl_debug_log, "BLK_EVAL.RETOP = 0x%"UVxf"\n",
1216 PTR2UV(cx->blk_eval.retop));
1219 case CXt_LOOP_LAZYIV:
1220 case CXt_LOOP_LAZYSV:
1222 case CXt_LOOP_PLAIN:
1223 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n", CxLABEL(cx));
1224 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
1225 (long)cx->blk_loop.resetsp);
1226 PerlIO_printf(Perl_debug_log, "BLK_LOOP.MY_OP = 0x%"UVxf"\n",
1227 PTR2UV(cx->blk_loop.my_op));
1228 /* XXX: not accurate for LAZYSV/IV */
1229 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%"UVxf"\n",
1230 PTR2UV(cx->blk_loop.state_u.ary.ary));
1231 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
1232 (long)cx->blk_loop.state_u.ary.ix);
1233 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%"UVxf"\n",
1234 PTR2UV(CxITERVAR(cx)));
1238 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
1239 (long)cx->sb_iters);
1240 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
1241 (long)cx->sb_maxiters);
1242 PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n",
1243 (long)cx->sb_rflags);
1244 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
1246 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
1248 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%"UVxf"\n",
1249 PTR2UV(cx->sb_dstr));
1250 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%"UVxf"\n",
1251 PTR2UV(cx->sb_targ));
1252 PerlIO_printf(Perl_debug_log, "SB_S = 0x%"UVxf"\n",
1254 PerlIO_printf(Perl_debug_log, "SB_M = 0x%"UVxf"\n",
1256 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%"UVxf"\n",
1257 PTR2UV(cx->sb_strend));
1258 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%"UVxf"\n",
1259 PTR2UV(cx->sb_rxres));
1263 PERL_UNUSED_CONTEXT;
1264 PERL_UNUSED_ARG(cx);
1265 #endif /* DEBUGGING */
1270 * c-indentation-style: bsd
1272 * indent-tabs-mode: t
1275 * ex: set ts=8 sts=4 sw=4 noet: