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);
288 HV * const stash = GvSTASH(gv);
290 if (GvCVu(gv) && stash && HvENAME(stash))
291 mro_method_changed_in(GvSTASH(gv)); /* taking a method out of circulation ("local")*/
292 if (GvIOp(gv) && (IoFLAGS(GvIOp(gv)) & IOf_ARGV)) {
294 IoFLAGS(gp->gp_io) |= IOf_ARGV|IOf_START;
305 Perl_save_ary(pTHX_ GV *gv)
308 AV * const oav = GvAVn(gv);
311 PERL_ARGS_ASSERT_SAVE_ARY;
313 if (!AvREAL(oav) && AvREIFY(oav))
315 save_pushptrptr(SvREFCNT_inc_simple_NN(gv), oav, SAVEt_AV);
320 mg_localize(MUTABLE_SV(oav), MUTABLE_SV(av), TRUE);
325 Perl_save_hash(pTHX_ GV *gv)
330 PERL_ARGS_ASSERT_SAVE_HASH;
333 SvREFCNT_inc_simple_NN(gv), (ohv = GvHVn(gv)), SAVEt_HV
339 mg_localize(MUTABLE_SV(ohv), MUTABLE_SV(hv), TRUE);
344 Perl_save_item(pTHX_ SV *item)
347 SV * const sv = newSVsv(item);
349 PERL_ARGS_ASSERT_SAVE_ITEM;
351 save_pushptrptr(item, /* remember the pointer */
352 sv, /* remember the value */
357 Perl_save_bool(pTHX_ bool *boolp)
361 PERL_ARGS_ASSERT_SAVE_BOOL;
365 SSPUSHUV(SAVEt_BOOL | (*boolp << 8));
369 Perl_save_pushi32ptr(pTHX_ const I32 i, void *const ptr, const int type)
379 Perl_save_int(pTHX_ int *intp)
382 const UV shifted = (UV)*intp << SAVE_TIGHT_SHIFT;
384 PERL_ARGS_ASSERT_SAVE_INT;
386 if ((int)(shifted >> SAVE_TIGHT_SHIFT) == *intp) {
389 SSPUSHUV(SAVEt_INT_SMALL | shifted);
391 save_pushi32ptr(*intp, intp, SAVEt_INT);
395 Perl_save_I8(pTHX_ I8 *bytep)
399 PERL_ARGS_ASSERT_SAVE_I8;
403 SSPUSHUV(SAVEt_I8 | ((UV)*bytep << 8));
407 Perl_save_I16(pTHX_ I16 *intp)
411 PERL_ARGS_ASSERT_SAVE_I16;
415 SSPUSHUV(SAVEt_I16 | ((UV)*intp << 8));
419 Perl_save_I32(pTHX_ I32 *intp)
422 const UV shifted = (UV)*intp << SAVE_TIGHT_SHIFT;
424 PERL_ARGS_ASSERT_SAVE_I32;
426 if ((I32)(shifted >> SAVE_TIGHT_SHIFT) == *intp) {
429 SSPUSHUV(SAVEt_I32_SMALL | shifted);
431 save_pushi32ptr(*intp, intp, SAVEt_I32);
434 /* Cannot use save_sptr() to store a char* since the SV** cast will
435 * force word-alignment and we'll miss the pointer.
438 Perl_save_pptr(pTHX_ char **pptr)
442 PERL_ARGS_ASSERT_SAVE_PPTR;
444 save_pushptrptr(*pptr, pptr, SAVEt_PPTR);
448 Perl_save_vptr(pTHX_ void *ptr)
452 PERL_ARGS_ASSERT_SAVE_VPTR;
454 save_pushptrptr(*(char**)ptr, ptr, SAVEt_VPTR);
458 Perl_save_sptr(pTHX_ SV **sptr)
462 PERL_ARGS_ASSERT_SAVE_SPTR;
464 save_pushptrptr(*sptr, sptr, SAVEt_SPTR);
468 Perl_save_padsv_and_mortalize(pTHX_ PADOFFSET off)
472 ASSERT_CURPAD_ACTIVE("save_padsv");
473 SSPUSHPTR(SvREFCNT_inc_simple_NN(PL_curpad[off]));
474 SSPUSHPTR(PL_comppad);
475 SSPUSHLONG((long)off);
476 SSPUSHUV(SAVEt_PADSV_AND_MORTALIZE);
480 Perl_save_hptr(pTHX_ HV **hptr)
484 PERL_ARGS_ASSERT_SAVE_HPTR;
486 save_pushptrptr(*hptr, hptr, SAVEt_HPTR);
490 Perl_save_aptr(pTHX_ AV **aptr)
494 PERL_ARGS_ASSERT_SAVE_APTR;
496 save_pushptrptr(*aptr, aptr, SAVEt_APTR);
500 Perl_save_pushptr(pTHX_ void *const ptr, const int type)
509 Perl_save_clearsv(pTHX_ SV **svp)
512 const UV offset = svp - PL_curpad;
513 const UV offset_shifted = offset << SAVE_TIGHT_SHIFT;
515 PERL_ARGS_ASSERT_SAVE_CLEARSV;
517 ASSERT_CURPAD_ACTIVE("save_clearsv");
518 SvPADSTALE_off(*svp); /* mark lexical as active */
519 if ((offset_shifted >> SAVE_TIGHT_SHIFT) != offset)
520 Perl_croak(aTHX_ "panic: pad offset %"UVuf" out of range (%p-%p)",
521 offset, svp, PL_curpad);
524 SSPUSHUV(offset_shifted | SAVEt_CLEARSV);
528 Perl_save_delete(pTHX_ HV *hv, char *key, I32 klen)
532 PERL_ARGS_ASSERT_SAVE_DELETE;
534 save_pushptri32ptr(key, klen, SvREFCNT_inc_simple(hv), SAVEt_DELETE);
538 Perl_save_hdelete(pTHX_ HV *hv, SV *keysv)
544 PERL_ARGS_ASSERT_SAVE_HDELETE;
546 key = SvPV_const(keysv, len);
547 klen = SvUTF8(keysv) ? -(I32)len : (I32)len;
548 SvREFCNT_inc_simple_void_NN(hv);
549 save_pushptri32ptr(savepvn(key, len), klen, hv, SAVEt_DELETE);
553 Perl_save_adelete(pTHX_ AV *av, I32 key)
557 PERL_ARGS_ASSERT_SAVE_ADELETE;
559 SvREFCNT_inc_void(av);
560 save_pushi32ptr(key, av, SAVEt_ADELETE);
564 Perl_save_destructor(pTHX_ DESTRUCTORFUNC_NOCONTEXT_t f, void* p)
568 PERL_ARGS_ASSERT_SAVE_DESTRUCTOR;
573 SSPUSHUV(SAVEt_DESTRUCTOR);
577 Perl_save_destructor_x(pTHX_ DESTRUCTORFUNC_t f, void* p)
583 SSPUSHUV(SAVEt_DESTRUCTOR_X);
587 Perl_save_hints(pTHX)
590 COPHH *save_cophh = cophh_copy(CopHINTHASH_get(&PL_compiling));
591 if (PL_hints & HINT_LOCALIZE_HH) {
592 HV *oldhh = GvHV(PL_hintgv);
593 save_pushptri32ptr(oldhh, PL_hints, save_cophh, SAVEt_HINTS);
594 GvHV(PL_hintgv) = NULL; /* in case copying dies */
595 GvHV(PL_hintgv) = hv_copy_hints_hv(oldhh);
597 save_pushi32ptr(PL_hints, save_cophh, SAVEt_HINTS);
602 S_save_pushptri32ptr(pTHX_ void *const ptr1, const I32 i, void *const ptr2,
613 Perl_save_aelem_flags(pTHX_ AV *av, I32 idx, SV **sptr, const U32 flags)
618 PERL_ARGS_ASSERT_SAVE_AELEM_FLAGS;
621 save_pushptri32ptr(SvREFCNT_inc_simple(av), idx, SvREFCNT_inc(*sptr),
623 /* The array needs to hold a reference count on its new element, so it
625 if (!AvREAL(av) && AvREIFY(av))
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 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 bool was = TAINT_get;
713 Perl_croak(aTHX_ "panic: corrupt saved stack index %ld", (long) base);
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));
791 case SAVEt_HV: /* hash reference */
792 hv = MUTABLE_HV(SSPOPPTR);
793 gv = MUTABLE_GV(SSPOPPTR);
794 SvREFCNT_dec(GvHV(gv));
798 SvSETMAGIC(MUTABLE_SV(hv));
803 case SAVEt_INT_SMALL:
805 *(int*)ptr = (int)(uv >> SAVE_TIGHT_SHIFT);
807 case SAVEt_INT: /* int reference */
809 *(int*)ptr = (int)SSPOPINT;
811 case SAVEt_BOOL: /* bool reference */
813 *(bool*)ptr = cBOOL(uv >> 8);
814 #if !NO_TAINT_SUPPORT
815 if (ptr == &(TAINT_get)) {
816 /* If we don't update <was>, to reflect what was saved on the
817 * stack for PL_tainted, then we will overwrite this attempt to
818 * restore it when we exit this routine. Note that this won't
819 * work if this value was saved in a wider-than necessary type,
825 case SAVEt_I32_SMALL:
827 *(I32*)ptr = (I32)(uv >> SAVE_TIGHT_SHIFT);
829 case SAVEt_I32: /* I32 reference */
831 #ifdef PERL_DEBUG_READONLY_OPS
833 const I32 val = SSPOPINT;
834 if (*(I32*)ptr != val)
838 *(I32*)ptr = (I32)SSPOPINT;
841 case SAVEt_SPTR: /* SV* reference */
843 *(SV**)ptr = MUTABLE_SV(SSPOPPTR);
845 case SAVEt_VPTR: /* random* reference */
846 case SAVEt_PPTR: /* char* reference */
848 *(char**)ptr = (char*)SSPOPPTR;
850 case SAVEt_HPTR: /* HV* reference */
852 *(HV**)ptr = MUTABLE_HV(SSPOPPTR);
854 case SAVEt_APTR: /* AV* reference */
856 *(AV**)ptr = MUTABLE_AV(SSPOPPTR);
858 case SAVEt_GP: /* scalar reference */
860 gv = MUTABLE_GV(SSPOPPTR);
862 GvGP_set(gv, (GP*)ptr);
863 /* putting a method back into circulation ("local")*/
864 if (GvCVu(gv) && (hv=GvSTASH(gv)) && HvENAME_get(hv))
865 gv_method_changed(gv);
870 SvREFCNT_dec(MUTABLE_SV(ptr));
872 case SAVEt_FREECOPHH:
874 cophh_free((COPHH *)ptr);
876 case SAVEt_MORTALIZESV:
878 sv_2mortal(MUTABLE_SV(ptr));
882 ASSERT_CURPAD_LEGAL("SAVEt_FREEOP");
892 case SAVEt_CLEARPADRANGE:
893 i = (I32)((uv >> SAVE_TIGHT_SHIFT) & OPpPADRANGE_COUNTMASK);
894 svp = &PL_curpad[uv >>
895 (OPpPADRANGE_COUNTSHIFT + SAVE_TIGHT_SHIFT)] + i - 1;
898 svp = &PL_curpad[uv >> SAVE_TIGHT_SHIFT];
901 for (; i; i--, svp--) {
904 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
905 "Pad 0x%"UVxf"[0x%"UVxf"] clearsv: %ld sv=0x%"UVxf"<%"IVdf"> %s\n",
906 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
907 (long)(svp-PL_curpad), PTR2UV(sv), (IV)SvREFCNT(sv),
908 (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) ? "clear" : "abandon"
911 /* Can clear pad variable in place? */
912 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
914 * if a my variable that was made readonly is going out of
915 * scope, we want to remove the readonlyness so that it can
916 * go out of scope quietly
918 if (SvPADMY(sv) && !SvFAKE(sv))
921 if (SvTHINKFIRST(sv))
922 sv_force_normal_flags(sv, SV_IMMEDIATE_UNREF
924 if (SvTYPE(sv) == SVt_PVHV)
925 Perl_hv_kill_backrefs(aTHX_ MUTABLE_HV(sv));
928 sv_unmagic(sv, PERL_MAGIC_backref);
929 if (SvTYPE(sv) != SVt_PVCV)
933 switch (SvTYPE(sv)) {
937 av_clear(MUTABLE_AV(sv));
940 hv_clear(MUTABLE_HV(sv));
944 HEK * const hek = CvNAME_HEK((CV *)sv);
948 CvNAME_HEK_set(sv, hek);
955 SvPADSTALE_on(sv); /* mark as no longer live */
957 else { /* Someone has a claim on this, so abandon it. */
958 assert( SvFLAGS(sv) & SVs_PADMY);
959 assert(!(SvFLAGS(sv) & SVs_PADTMP));
960 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
961 case SVt_PVAV: *svp = MUTABLE_SV(newAV()); break;
962 case SVt_PVHV: *svp = MUTABLE_SV(newHV()); break;
966 *svp = newSV_type(SVt_PVCV);
971 share_hek_hek(CvNAME_HEK((CV *)sv)));
974 default: *svp = newSV(0); break;
976 SvREFCNT_dec(sv); /* Cast current value to the winds. */
977 /* preserve pad nature, but also mark as not live
978 * for any closure capturing */
979 SvFLAGS(*svp) |= (SVs_PADMY|SVs_PADSTALE);
986 hv = MUTABLE_HV(ptr);
989 (void)hv_delete(hv, (char*)ptr, i, G_DISCARD);
995 av = MUTABLE_AV(ptr);
997 (void)av_delete(av, i, G_DISCARD);
1000 case SAVEt_DESTRUCTOR_X:
1002 (*SSPOPDXPTR)(aTHX_ ptr);
1004 case SAVEt_REGCONTEXT:
1005 /* regexp must have croaked */
1007 PL_savestack_ix -= uv >> SAVE_TIGHT_SHIFT;
1009 case SAVEt_STACK_POS: /* Position on Perl stack */
1011 PL_stack_sp = PL_stack_base + i;
1013 case SAVEt_STACK_CXPOS: /* blk_oldsp on context stack */
1015 cxstack[i].blk_oldsp = SSPOPINT;
1017 case SAVEt_AELEM: /* array element */
1018 value = MUTABLE_SV(SSPOPPTR);
1020 av = MUTABLE_AV(SSPOPPTR);
1021 ptr = av_fetch(av,i,1);
1022 if (!AvREAL(av) && AvREIFY(av)) /* undo reify guard */
1023 SvREFCNT_dec(value);
1026 if (sv && sv != &PL_sv_undef) {
1027 if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied))
1028 SvREFCNT_inc_void_NN(sv);
1033 SvREFCNT_dec(value);
1035 case SAVEt_HELEM: /* hash element */
1036 value = MUTABLE_SV(SSPOPPTR);
1037 sv = MUTABLE_SV(SSPOPPTR);
1038 hv = MUTABLE_HV(SSPOPPTR);
1039 ptr = hv_fetch_ent(hv, sv, 1, 0);
1042 const SV * const oval = HeVAL((HE*)ptr);
1043 if (oval && oval != &PL_sv_undef) {
1044 ptr = &HeVAL((HE*)ptr);
1045 if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1046 SvREFCNT_inc_void(*(SV**)ptr);
1047 av = MUTABLE_AV(hv); /* what to refcnt_dec */
1052 SvREFCNT_dec(value);
1055 PL_op = (OP*)SSPOPPTR;
1058 if ((PL_hints & HINT_LOCALIZE_HH)) {
1059 while (GvHV(PL_hintgv)) {
1060 HV *hv = GvHV(PL_hintgv);
1061 GvHV(PL_hintgv) = NULL;
1062 SvREFCNT_dec(MUTABLE_SV(hv));
1065 cophh_free(CopHINTHASH_get(&PL_compiling));
1066 CopHINTHASH_set(&PL_compiling, (COPHH*)SSPOPPTR);
1067 *(I32*)&PL_hints = (I32)SSPOPINT;
1068 if (PL_hints & HINT_LOCALIZE_HH) {
1069 SvREFCNT_dec(MUTABLE_SV(GvHV(PL_hintgv)));
1070 GvHV(PL_hintgv) = MUTABLE_HV(SSPOPPTR);
1072 if (!GvHV(PL_hintgv)) {
1073 /* Need to add a new one manually, else rv2hv can
1074 add one via GvHVn and it won't have the magic set. */
1075 HV *const hv = newHV();
1076 hv_magic(hv, NULL, PERL_MAGIC_hints);
1077 GvHV(PL_hintgv) = hv;
1079 assert(GvHV(PL_hintgv));
1082 PL_comppad = (PAD*)SSPOPPTR;
1084 PL_curpad = AvARRAY(PL_comppad);
1088 case SAVEt_PADSV_AND_MORTALIZE:
1090 const PADOFFSET off = (PADOFFSET)SSPOPLONG;
1094 svp = AvARRAY((PAD*)ptr) + off;
1095 /* This mortalizing used to be done by POPLOOP() via itersave.
1096 But as we have all the information here, we can do it here,
1097 save even having to have itersave in the struct. */
1099 *svp = MUTABLE_SV(SSPOPPTR);
1102 case SAVEt_SAVESWITCHSTACK:
1105 AV *const t = MUTABLE_AV(SSPOPPTR);
1106 AV *const f = MUTABLE_AV(SSPOPPTR);
1108 PL_curstackinfo->si_stack = f;
1111 case SAVEt_SET_SVFLAGS:
1113 const U32 val = (U32)SSPOPINT;
1114 const U32 mask = (U32)SSPOPINT;
1115 sv = MUTABLE_SV(SSPOPPTR);
1116 SvFLAGS(sv) &= ~mask;
1121 /* This would be a mathom, but Perl_save_svref() calls a static
1122 function, S_save_scalar_at(), so has to stay in this file. */
1123 case SAVEt_SVREF: /* scalar reference */
1124 value = MUTABLE_SV(SSPOPPTR);
1126 av = NULL; /* what to refcnt_dec */
1129 /* These are only saved in mathoms.c */
1131 gv = MUTABLE_GV(SSPOPPTR);
1132 (void)sv_clear(MUTABLE_SV(gv));
1134 case SAVEt_LONG: /* long reference */
1136 *(long*)ptr = (long)SSPOPLONG;
1138 case SAVEt_IV: /* IV reference */
1140 *(IV*)ptr = (IV)SSPOPIV;
1143 case SAVEt_I16: /* I16 reference */
1145 *(I16*)ptr = (I16)(uv >> 8);
1147 case SAVEt_I8: /* I8 reference */
1149 *(I8*)ptr = (I8)(uv >> 8);
1151 case SAVEt_DESTRUCTOR:
1155 case SAVEt_COMPILE_WARNINGS:
1158 if (!specialWARN(PL_compiling.cop_warnings))
1159 PerlMemShared_free(PL_compiling.cop_warnings);
1161 PL_compiling.cop_warnings = (STRLEN*)ptr;
1163 case SAVEt_RE_STATE:
1165 const struct re_save_state *const state
1166 = (struct re_save_state *)
1167 (PL_savestack + PL_savestack_ix
1168 - SAVESTACK_ALLOC_FOR_RE_SAVE_STATE);
1169 PL_savestack_ix -= SAVESTACK_ALLOC_FOR_RE_SAVE_STATE;
1171 if (PL_reg_poscache != state->re_state_reg_poscache) {
1172 Safefree(PL_reg_poscache);
1174 Copy(state, &PL_reg_state, 1, struct re_save_state);
1179 parser_free((yy_parser *) ptr);
1182 Perl_croak(aTHX_ "panic: leave_scope inconsistency %u", type);
1192 Perl_cx_dump(pTHX_ PERL_CONTEXT *cx)
1196 PERL_ARGS_ASSERT_CX_DUMP;
1199 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]);
1200 if (CxTYPE(cx) != CXt_SUBST) {
1201 const char *gimme_text;
1202 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
1203 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%"UVxf"\n",
1204 PTR2UV(cx->blk_oldcop));
1205 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
1206 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
1207 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%"UVxf"\n",
1208 PTR2UV(cx->blk_oldpm));
1209 switch (cx->blk_gimme) {
1211 gimme_text = "VOID";
1214 gimme_text = "SCALAR";
1217 gimme_text = "LIST";
1220 gimme_text = "UNKNOWN";
1223 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", gimme_text);
1225 switch (CxTYPE(cx)) {
1230 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.CV = 0x%"UVxf"\n",
1231 PTR2UV(cx->blk_format.cv));
1232 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.GV = 0x%"UVxf"\n",
1233 PTR2UV(cx->blk_format.gv));
1234 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.DFOUTGV = 0x%"UVxf"\n",
1235 PTR2UV(cx->blk_format.dfoutgv));
1236 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.HASARGS = %d\n",
1237 (int)CxHASARGS(cx));
1238 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.RETOP = 0x%"UVxf"\n",
1239 PTR2UV(cx->blk_format.retop));
1242 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%"UVxf"\n",
1243 PTR2UV(cx->blk_sub.cv));
1244 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
1245 (long)cx->blk_sub.olddepth);
1246 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
1247 (int)CxHASARGS(cx));
1248 PerlIO_printf(Perl_debug_log, "BLK_SUB.LVAL = %d\n", (int)CxLVAL(cx));
1249 PerlIO_printf(Perl_debug_log, "BLK_SUB.RETOP = 0x%"UVxf"\n",
1250 PTR2UV(cx->blk_sub.retop));
1253 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
1254 (long)CxOLD_IN_EVAL(cx));
1255 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
1256 PL_op_name[CxOLD_OP_TYPE(cx)],
1257 PL_op_desc[CxOLD_OP_TYPE(cx)]);
1258 if (cx->blk_eval.old_namesv)
1259 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
1260 SvPVX_const(cx->blk_eval.old_namesv));
1261 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%"UVxf"\n",
1262 PTR2UV(cx->blk_eval.old_eval_root));
1263 PerlIO_printf(Perl_debug_log, "BLK_EVAL.RETOP = 0x%"UVxf"\n",
1264 PTR2UV(cx->blk_eval.retop));
1267 case CXt_LOOP_LAZYIV:
1268 case CXt_LOOP_LAZYSV:
1270 case CXt_LOOP_PLAIN:
1271 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n", CxLABEL(cx));
1272 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
1273 (long)cx->blk_loop.resetsp);
1274 PerlIO_printf(Perl_debug_log, "BLK_LOOP.MY_OP = 0x%"UVxf"\n",
1275 PTR2UV(cx->blk_loop.my_op));
1276 /* XXX: not accurate for LAZYSV/IV */
1277 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%"UVxf"\n",
1278 PTR2UV(cx->blk_loop.state_u.ary.ary));
1279 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
1280 (long)cx->blk_loop.state_u.ary.ix);
1281 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%"UVxf"\n",
1282 PTR2UV(CxITERVAR(cx)));
1286 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
1287 (long)cx->sb_iters);
1288 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
1289 (long)cx->sb_maxiters);
1290 PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n",
1291 (long)cx->sb_rflags);
1292 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
1294 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
1296 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%"UVxf"\n",
1297 PTR2UV(cx->sb_dstr));
1298 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%"UVxf"\n",
1299 PTR2UV(cx->sb_targ));
1300 PerlIO_printf(Perl_debug_log, "SB_S = 0x%"UVxf"\n",
1302 PerlIO_printf(Perl_debug_log, "SB_M = 0x%"UVxf"\n",
1304 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%"UVxf"\n",
1305 PTR2UV(cx->sb_strend));
1306 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%"UVxf"\n",
1307 PTR2UV(cx->sb_rxres));
1311 PERL_UNUSED_CONTEXT;
1312 PERL_UNUSED_ARG(cx);
1313 #endif /* DEBUGGING */
1318 * c-indentation-style: bsd
1320 * indent-tabs-mode: nil
1323 * ex: set ts=8 sts=4 sw=4 et: