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, SSize_t 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_ SSize_t 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 SSize_t 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_NN(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)
210 Perl_save_scalar(pTHX_ GV *gv)
213 SV ** const sptr = &GvSVn(gv);
215 PERL_ARGS_ASSERT_SAVE_SCALAR;
217 if (SvGMAGICAL(*sptr)) {
222 save_pushptrptr(SvREFCNT_inc_simple(gv), SvREFCNT_inc(*sptr), SAVEt_SV);
223 return save_scalar_at(sptr, SAVEf_SETMAGIC); /* XXX - FIXME - see #60360 */
226 /* Like save_sptr(), but also SvREFCNT_dec()s the new value. Can be used to
227 * restore a global SV to its prior contents, freeing new value. */
229 Perl_save_generic_svref(pTHX_ SV **sptr)
233 PERL_ARGS_ASSERT_SAVE_GENERIC_SVREF;
235 save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_GENERIC_SVREF);
238 /* Like save_pptr(), but also Safefree()s the new value if it is different
239 * from the old one. Can be used to restore a global char* to its prior
240 * contents, freeing new value. */
242 Perl_save_generic_pvref(pTHX_ char **str)
246 PERL_ARGS_ASSERT_SAVE_GENERIC_PVREF;
248 save_pushptrptr(*str, str, SAVEt_GENERIC_PVREF);
251 /* Like save_generic_pvref(), but uses PerlMemShared_free() rather than Safefree().
252 * Can be used to restore a shared global char* to its prior
253 * contents, freeing new value. */
255 Perl_save_shared_pvref(pTHX_ char **str)
259 PERL_ARGS_ASSERT_SAVE_SHARED_PVREF;
261 save_pushptrptr(str, *str, SAVEt_SHARED_PVREF);
264 /* set the SvFLAGS specified by mask to the values in val */
267 Perl_save_set_svflags(pTHX_ SV* sv, U32 mask, U32 val)
272 PERL_ARGS_ASSERT_SAVE_SET_SVFLAGS;
277 SS_ADD_UV(SAVEt_SET_SVFLAGS);
282 Perl_save_gp(pTHX_ GV *gv, I32 empty)
286 PERL_ARGS_ASSERT_SAVE_GP;
288 save_pushptrptr(SvREFCNT_inc(gv), GvGP(gv), SAVEt_GP);
291 GP *gp = Perl_newGP(aTHX_ gv);
292 HV * const stash = GvSTASH(gv);
293 bool isa_changed = 0;
295 if (stash && HvENAME(stash)) {
296 if (GvNAMELEN(gv) == 3 && strnEQ(GvNAME(gv), "ISA", 3))
299 /* taking a method out of circulation ("local")*/
300 mro_method_changed_in(stash);
302 if (GvIOp(gv) && (IoFLAGS(GvIOp(gv)) & IOf_ARGV)) {
304 IoFLAGS(gp->gp_io) |= IOf_ARGV|IOf_START;
307 if (isa_changed) mro_isa_changed_in(stash);
316 Perl_save_ary(pTHX_ GV *gv)
319 AV * const oav = GvAVn(gv);
322 PERL_ARGS_ASSERT_SAVE_ARY;
324 if (!AvREAL(oav) && AvREIFY(oav))
326 save_pushptrptr(SvREFCNT_inc_simple_NN(gv), oav, SAVEt_AV);
331 mg_localize(MUTABLE_SV(oav), MUTABLE_SV(av), TRUE);
336 Perl_save_hash(pTHX_ GV *gv)
341 PERL_ARGS_ASSERT_SAVE_HASH;
344 SvREFCNT_inc_simple_NN(gv), (ohv = GvHVn(gv)), SAVEt_HV
350 mg_localize(MUTABLE_SV(ohv), MUTABLE_SV(hv), TRUE);
355 Perl_save_item(pTHX_ SV *item)
358 SV * const sv = newSVsv(item);
360 PERL_ARGS_ASSERT_SAVE_ITEM;
362 save_pushptrptr(item, /* remember the pointer */
363 sv, /* remember the value */
368 Perl_save_bool(pTHX_ bool *boolp)
373 PERL_ARGS_ASSERT_SAVE_BOOL;
376 SS_ADD_UV(SAVEt_BOOL | (*boolp << 8));
381 Perl_save_pushi32ptr(pTHX_ const I32 i, void *const ptr, const int type)
393 Perl_save_int(pTHX_ int *intp)
397 UV type = ((UV)((UV)i << SAVE_TIGHT_SHIFT) | SAVEt_INT_SMALL);
401 PERL_ARGS_ASSERT_SAVE_INT;
403 if ((int)(type >> SAVE_TIGHT_SHIFT) != i) {
414 Perl_save_I8(pTHX_ I8 *bytep)
419 PERL_ARGS_ASSERT_SAVE_I8;
422 SS_ADD_UV(SAVEt_I8 | ((UV)*bytep << 8));
427 Perl_save_I16(pTHX_ I16 *intp)
432 PERL_ARGS_ASSERT_SAVE_I16;
435 SS_ADD_UV(SAVEt_I16 | ((UV)*intp << 8));
440 Perl_save_I32(pTHX_ I32 *intp)
444 UV type = ((I32)((U32)i << SAVE_TIGHT_SHIFT) | SAVEt_I32_SMALL);
448 PERL_ARGS_ASSERT_SAVE_I32;
450 if ((I32)(type >> SAVE_TIGHT_SHIFT) != i) {
461 Perl_save_strlen(pTHX_ STRLEN *ptr)
466 PERL_ARGS_ASSERT_SAVE_STRLEN;
470 SS_ADD_UV(SAVEt_STRLEN);
474 /* Cannot use save_sptr() to store a char* since the SV** cast will
475 * force word-alignment and we'll miss the pointer.
478 Perl_save_pptr(pTHX_ char **pptr)
482 PERL_ARGS_ASSERT_SAVE_PPTR;
484 save_pushptrptr(*pptr, pptr, SAVEt_PPTR);
488 Perl_save_vptr(pTHX_ void *ptr)
492 PERL_ARGS_ASSERT_SAVE_VPTR;
494 save_pushptrptr(*(char**)ptr, ptr, SAVEt_VPTR);
498 Perl_save_sptr(pTHX_ SV **sptr)
502 PERL_ARGS_ASSERT_SAVE_SPTR;
504 save_pushptrptr(*sptr, sptr, SAVEt_SPTR);
508 Perl_save_padsv_and_mortalize(pTHX_ PADOFFSET off)
513 ASSERT_CURPAD_ACTIVE("save_padsv");
514 SS_ADD_PTR(SvREFCNT_inc_simple_NN(PL_curpad[off]));
515 SS_ADD_PTR(PL_comppad);
517 SS_ADD_UV(SAVEt_PADSV_AND_MORTALIZE);
522 Perl_save_hptr(pTHX_ HV **hptr)
526 PERL_ARGS_ASSERT_SAVE_HPTR;
528 save_pushptrptr(*hptr, hptr, SAVEt_HPTR);
532 Perl_save_aptr(pTHX_ AV **aptr)
536 PERL_ARGS_ASSERT_SAVE_APTR;
538 save_pushptrptr(*aptr, aptr, SAVEt_APTR);
542 Perl_save_pushptr(pTHX_ void *const ptr, const int type)
552 Perl_save_clearsv(pTHX_ SV **svp)
555 const UV offset = svp - PL_curpad;
556 const UV offset_shifted = offset << SAVE_TIGHT_SHIFT;
558 PERL_ARGS_ASSERT_SAVE_CLEARSV;
560 ASSERT_CURPAD_ACTIVE("save_clearsv");
561 SvPADSTALE_off(*svp); /* mark lexical as active */
562 if ((offset_shifted >> SAVE_TIGHT_SHIFT) != offset) {
563 Perl_croak(aTHX_ "panic: pad offset %"UVuf" out of range (%p-%p)",
564 offset, svp, PL_curpad);
569 SS_ADD_UV(offset_shifted | SAVEt_CLEARSV);
575 Perl_save_delete(pTHX_ HV *hv, char *key, I32 klen)
579 PERL_ARGS_ASSERT_SAVE_DELETE;
581 save_pushptri32ptr(key, klen, SvREFCNT_inc_simple(hv), SAVEt_DELETE);
585 Perl_save_hdelete(pTHX_ HV *hv, SV *keysv)
591 PERL_ARGS_ASSERT_SAVE_HDELETE;
593 key = SvPV_const(keysv, len);
594 klen = SvUTF8(keysv) ? -(I32)len : (I32)len;
595 SvREFCNT_inc_simple_void_NN(hv);
596 save_pushptri32ptr(savepvn(key, len), klen, hv, SAVEt_DELETE);
600 Perl_save_adelete(pTHX_ AV *av, I32 key)
604 PERL_ARGS_ASSERT_SAVE_ADELETE;
606 SvREFCNT_inc_void(av);
607 save_pushi32ptr(key, av, SAVEt_ADELETE);
611 Perl_save_destructor(pTHX_ DESTRUCTORFUNC_NOCONTEXT_t f, void* p)
616 PERL_ARGS_ASSERT_SAVE_DESTRUCTOR;
620 SS_ADD_UV(SAVEt_DESTRUCTOR);
625 Perl_save_destructor_x(pTHX_ DESTRUCTORFUNC_t f, void* p)
632 SS_ADD_UV(SAVEt_DESTRUCTOR_X);
637 Perl_save_hints(pTHX)
640 COPHH *save_cophh = cophh_copy(CopHINTHASH_get(&PL_compiling));
641 if (PL_hints & HINT_LOCALIZE_HH) {
642 HV *oldhh = GvHV(PL_hintgv);
643 save_pushptri32ptr(oldhh, PL_hints, save_cophh, SAVEt_HINTS);
644 GvHV(PL_hintgv) = NULL; /* in case copying dies */
645 GvHV(PL_hintgv) = hv_copy_hints_hv(oldhh);
647 save_pushi32ptr(PL_hints, save_cophh, SAVEt_HINTS);
652 S_save_pushptri32ptr(pTHX_ void *const ptr1, const I32 i, void *const ptr2,
664 Perl_save_aelem_flags(pTHX_ AV *av, I32 idx, SV **sptr, const U32 flags)
669 PERL_ARGS_ASSERT_SAVE_AELEM_FLAGS;
672 save_pushptri32ptr(SvREFCNT_inc_simple(av), idx, SvREFCNT_inc(*sptr),
674 /* The array needs to hold a reference count on its new element, so it
676 if (!AvREAL(av) && AvREIFY(av))
678 save_scalar_at(sptr, flags); /* XXX - FIXME - see #60360 */
679 if (flags & SAVEf_KEEPOLDELEM)
682 /* If we're localizing a tied array element, this new sv
683 * won't actually be stored in the array - so it won't get
684 * reaped when the localize ends. Ensure it gets reaped by
685 * mortifying it instead. DAPM */
686 if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied))
691 Perl_save_helem_flags(pTHX_ HV *hv, SV *key, SV **sptr, const U32 flags)
696 PERL_ARGS_ASSERT_SAVE_HELEM_FLAGS;
701 SS_ADD_PTR(SvREFCNT_inc_simple(hv));
702 SS_ADD_PTR(newSVsv(key));
703 SS_ADD_PTR(SvREFCNT_inc(*sptr));
704 SS_ADD_UV(SAVEt_HELEM);
707 save_scalar_at(sptr, flags);
708 if (flags & SAVEf_KEEPOLDELEM)
711 /* If we're localizing a tied hash element, this new sv
712 * won't actually be stored in the hash - so it won't get
713 * reaped when the localize ends. Ensure it gets reaped by
714 * mortifying it instead. DAPM */
715 if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
720 Perl_save_svref(pTHX_ SV **sptr)
724 PERL_ARGS_ASSERT_SAVE_SVREF;
727 save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_SVREF);
728 return save_scalar_at(sptr, SAVEf_SETMAGIC); /* XXX - FIXME - see #60360 */
732 Perl_save_alloc(pTHX_ I32 size, I32 pad)
735 const I32 start = pad + ((char*)&PL_savestack[PL_savestack_ix]
736 - (char*)PL_savestack);
737 const UV elems = 1 + ((size + pad - 1) / sizeof(*PL_savestack));
738 const UV elems_shifted = elems << SAVE_TIGHT_SHIFT;
740 if ((elems_shifted >> SAVE_TIGHT_SHIFT) != elems)
742 "panic: save_alloc elems %"UVuf" out of range (%"IVdf"-%"IVdf")",
743 elems, (IV)size, (IV)pad);
747 PL_savestack_ix += elems;
748 SSPUSHUV(SAVEt_ALLOC | elems_shifted);
754 #define ARG0_SV MUTABLE_SV(arg0.any_ptr)
755 #define ARG0_AV MUTABLE_AV(arg0.any_ptr)
756 #define ARG0_HV MUTABLE_HV(arg0.any_ptr)
757 #define ARG0_PTR arg0.any_ptr
758 #define ARG0_PV (char*)(arg0.any_ptr)
759 #define ARG0_PVP (char**)(arg0.any_ptr)
760 #define ARG0_I32 (arg0.any_i32)
762 #define ARG1_SV MUTABLE_SV(arg1.any_ptr)
763 #define ARG1_AV MUTABLE_AV(arg1.any_ptr)
764 #define ARG1_GV MUTABLE_GV(arg1.any_ptr)
765 #define ARG1_SVP (SV**)(arg1.any_ptr)
766 #define ARG1_PVP (char**)(arg1.any_ptr)
767 #define ARG1_PTR arg1.any_ptr
768 #define ARG1_PV (char*)(arg1.any_ptr)
769 #define ARG1_I32 (arg1.any_i32)
771 #define ARG2_SV MUTABLE_SV(arg2.any_ptr)
772 #define ARG2_AV MUTABLE_AV(arg2.any_ptr)
773 #define ARG2_HV MUTABLE_HV(arg2.any_ptr)
774 #define ARG2_GV MUTABLE_GV(arg2.any_ptr)
775 #define ARG2_PV (char*)(arg2.any_ptr)
778 Perl_leave_scope(pTHX_ I32 base)
782 /* Localise the effects of the TAINT_NOT inside the loop. */
783 bool was = TAINT_get;
785 ANY arg0, arg1, arg2;
787 /* these initialisations are logically unnecessary, but they shut up
788 * spurious 'may be used uninitialized' compiler warnings */
794 Perl_croak(aTHX_ "panic: corrupt saved stack index %ld", (long) base);
795 DEBUG_l(Perl_deb(aTHX_ "savestack: releasing items %ld -> %ld\n",
796 (long)PL_savestack_ix, (long)base));
797 while (PL_savestack_ix > base) {
807 I32 ix = PL_savestack_ix - 1;
808 ANY *p = &PL_savestack[ix];
810 type = (U8)uv & SAVE_MASK;
811 if (type > SAVEt_ARG0_MAX) {
814 if (type > SAVEt_ARG1_MAX) {
816 if (type > SAVEt_ARG2_MAX) {
822 PL_savestack_ix = ix;
826 case SAVEt_ITEM: /* normal string */
827 sv_replace(ARG1_SV, ARG0_SV);
828 if (SvSMAGICAL(ARG1_SV)) {
835 /* This would be a mathom, but Perl_save_svref() calls a static
836 function, S_save_scalar_at(), so has to stay in this file. */
837 case SAVEt_SVREF: /* scalar reference */
839 refsv = NULL; /* what to refcnt_dec */
842 case SAVEt_SV: /* scalar reference */
843 svp = &GvSV(ARG1_GV);
844 refsv = ARG1_SV; /* what to refcnt_dec */
847 SV * const sv = *svp;
850 if (SvSMAGICAL(ARG0_SV)) {
855 SvREFCNT_dec_NN(ARG0_SV);
859 case SAVEt_GENERIC_PVREF: /* generic pv */
860 if (*ARG0_PVP != ARG1_PV) {
865 case SAVEt_SHARED_PVREF: /* shared pv */
866 if (*ARG1_PVP != ARG0_PV) {
868 PerlMem_free(*ARG1_PVP);
870 PerlMemShared_free(*ARG1_PVP);
875 case SAVEt_GVSV: /* scalar slot in GV */
876 svp = &GvSV(ARG1_GV);
878 case SAVEt_GENERIC_SVREF: /* generic sv */
882 SV * const sv = *svp;
885 SvREFCNT_dec(ARG0_SV);
888 case SAVEt_GVSLOT: /* any slot in GV */
890 HV *const hv = GvSTASH(ARG2_GV);
892 if (hv && HvENAME(hv) && (
893 (ARG0_SV && SvTYPE(ARG0_SV) == SVt_PVCV)
894 || (*svp && SvTYPE(*svp) == SVt_PVCV)
897 if ((char *)svp < (char *)GvGP(ARG2_GV)
898 || (char *)svp > (char *)GvGP(ARG2_GV) + sizeof(struct gp)
899 || GvREFCNT(ARG2_GV) > 1)
901 else mro_method_changed_in(hv);
905 case SAVEt_AV: /* array reference */
906 SvREFCNT_dec(GvAV(ARG1_GV));
907 GvAV(ARG1_GV) = ARG0_AV;
908 if (SvSMAGICAL(ARG0_SV)) {
913 SvREFCNT_dec_NN(ARG1_GV);
915 case SAVEt_HV: /* hash reference */
916 SvREFCNT_dec(GvHV(ARG1_GV));
917 GvHV(ARG1_GV) = ARG0_HV;
918 if (SvSMAGICAL(ARG0_SV)) {
923 SvREFCNT_dec_NN(ARG1_GV);
925 case SAVEt_INT_SMALL:
926 *(int*)ARG0_PTR = (int)(uv >> SAVE_TIGHT_SHIFT);
928 case SAVEt_INT: /* int reference */
929 *(int*)ARG0_PTR = (int)ARG1_I32;
931 case SAVEt_STRLEN: /* STRLEN/size_t ref */
932 *(STRLEN*)ARG0_PTR = (STRLEN)arg1.any_iv;
934 case SAVEt_BOOL: /* bool reference */
935 *(bool*)ARG0_PTR = cBOOL(uv >> 8);
936 #ifdef NO_TAINT_SUPPORT
937 PERL_UNUSED_VAR(was);
939 if (ARG0_PTR == &(TAINT_get)) {
940 /* If we don't update <was>, to reflect what was saved on the
941 * stack for PL_tainted, then we will overwrite this attempt to
942 * restore it when we exit this routine. Note that this won't
943 * work if this value was saved in a wider-than necessary type,
945 was = *(bool*)ARG0_PTR;
949 case SAVEt_I32_SMALL:
950 *(I32*)ARG0_PTR = (I32)(uv >> SAVE_TIGHT_SHIFT);
952 case SAVEt_I32: /* I32 reference */
953 #ifdef PERL_DEBUG_READONLY_OPS
954 if (*(I32*)ARG0_PTR != ARG1_I32)
956 *(I32*)ARG0_PTR = ARG1_I32;
958 case SAVEt_SPTR: /* SV* reference */
959 *(SV**)(ARG0_PTR)= ARG1_SV;
961 case SAVEt_VPTR: /* random* reference */
962 case SAVEt_PPTR: /* char* reference */
965 case SAVEt_HPTR: /* HV* reference */
966 *(HV**)ARG0_PTR = MUTABLE_HV(ARG1_PTR);
968 case SAVEt_APTR: /* AV* reference */
969 *(AV**)ARG0_PTR = ARG1_AV;
971 case SAVEt_GP: /* scalar reference */
974 /* possibly taking a method out of circulation */
975 const bool had_method = !!GvCVu(ARG1_GV);
977 GvGP_set(ARG1_GV, (GP*)ARG0_PTR);
978 if ((hv=GvSTASH(ARG1_GV)) && HvENAME_get(hv)) {
979 if ( GvNAMELEN(ARG1_GV) == 3
980 && strnEQ(GvNAME(ARG1_GV), "ISA", 3)
982 mro_isa_changed_in(hv);
983 else if (had_method || GvCVu(ARG1_GV))
984 /* putting a method back into circulation ("local")*/
985 gv_method_changed(ARG1_GV);
987 SvREFCNT_dec_NN(ARG1_GV);
991 SvREFCNT_dec(ARG0_SV);
993 case SAVEt_FREECOPHH:
994 cophh_free((COPHH *)ARG0_PTR);
996 case SAVEt_MORTALIZESV:
1000 ASSERT_CURPAD_LEGAL("SAVEt_FREEOP");
1001 op_free((OP*)ARG0_PTR);
1012 case SAVEt_CLEARPADRANGE:
1013 i = (I32)((uv >> SAVE_TIGHT_SHIFT) & OPpPADRANGE_COUNTMASK);
1014 svp = &PL_curpad[uv >>
1015 (OPpPADRANGE_COUNTSHIFT + SAVE_TIGHT_SHIFT)] + i - 1;
1018 svp = &PL_curpad[uv >> SAVE_TIGHT_SHIFT];
1021 for (; i; i--, svp--) {
1024 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1025 "Pad 0x%"UVxf"[0x%"UVxf"] clearsv: %ld sv=0x%"UVxf"<%"IVdf"> %s\n",
1026 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
1027 (long)(svp-PL_curpad), PTR2UV(sv), (IV)SvREFCNT(sv),
1028 (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) ? "clear" : "abandon"
1031 /* Can clear pad variable in place? */
1032 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
1034 * if a my variable that was made readonly is going out of
1035 * scope, we want to remove the readonlyness so that it can
1036 * go out of scope quietly
1038 if (SvPADMY(sv) && !SvFAKE(sv))
1041 if (SvTHINKFIRST(sv))
1042 sv_force_normal_flags(sv, SV_IMMEDIATE_UNREF
1044 if (SvTYPE(sv) == SVt_PVHV)
1045 Perl_hv_kill_backrefs(aTHX_ MUTABLE_HV(sv));
1048 sv_unmagic(sv, PERL_MAGIC_backref);
1049 if (SvTYPE(sv) != SVt_PVCV)
1053 switch (SvTYPE(sv)) {
1057 av_clear(MUTABLE_AV(sv));
1060 hv_clear(MUTABLE_HV(sv));
1064 HEK * const hek = CvNAME_HEK((CV *)sv);
1068 CvNAME_HEK_set(sv, hek);
1075 SvPADSTALE_on(sv); /* mark as no longer live */
1077 else { /* Someone has a claim on this, so abandon it. */
1078 assert( SvFLAGS(sv) & SVs_PADMY);
1079 assert(!(SvFLAGS(sv) & SVs_PADTMP));
1080 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
1081 case SVt_PVAV: *svp = MUTABLE_SV(newAV()); break;
1082 case SVt_PVHV: *svp = MUTABLE_SV(newHV()); break;
1086 *svp = newSV_type(SVt_PVCV);
1089 assert(CvNAMED(sv));
1090 CvNAME_HEK_set(*svp,
1091 share_hek_hek(CvNAME_HEK((CV *)sv)));
1094 default: *svp = newSV(0); break;
1096 SvREFCNT_dec_NN(sv); /* Cast current value to the winds. */
1097 /* preserve pad nature, but also mark as not live
1098 * for any closure capturing */
1099 SvFLAGS(*svp) |= (SVs_PADMY|SVs_PADSTALE);
1105 (void)hv_delete(ARG0_HV, ARG2_PV, ARG1_I32, G_DISCARD);
1106 SvREFCNT_dec(ARG0_HV);
1107 Safefree(arg2.any_ptr);
1110 (void)av_delete(ARG0_AV, ARG1_I32, G_DISCARD);
1111 SvREFCNT_dec(ARG0_AV);
1113 case SAVEt_DESTRUCTOR_X:
1114 (*arg1.any_dxptr)(aTHX_ ARG0_PTR);
1116 case SAVEt_REGCONTEXT:
1117 /* regexp must have croaked */
1119 PL_savestack_ix -= uv >> SAVE_TIGHT_SHIFT;
1121 case SAVEt_STACK_POS: /* Position on Perl stack */
1122 PL_stack_sp = PL_stack_base + arg0.any_i32;
1124 case SAVEt_AELEM: /* array element */
1125 svp = av_fetch(ARG2_AV, ARG1_I32, 1);
1126 if (!AvREAL(ARG2_AV) && AvREIFY(ARG2_AV)) /* undo reify guard */
1127 SvREFCNT_dec(ARG0_SV);
1129 SV * const sv = *svp;
1130 if (sv && sv != &PL_sv_undef) {
1131 if (SvTIED_mg((const SV *)ARG2_AV, PERL_MAGIC_tied))
1132 SvREFCNT_inc_void_NN(sv);
1137 SvREFCNT_dec(ARG2_AV);
1138 SvREFCNT_dec(ARG0_SV);
1140 case SAVEt_HELEM: /* hash element */
1142 HE * const he = hv_fetch_ent(ARG2_HV, ARG1_SV, 1, 0);
1143 SvREFCNT_dec(ARG1_SV);
1145 const SV * const oval = HeVAL(he);
1146 if (oval && oval != &PL_sv_undef) {
1148 if (SvTIED_mg((const SV *)ARG2_HV, PERL_MAGIC_tied))
1149 SvREFCNT_inc_void(*svp);
1150 refsv = ARG2_SV; /* what to refcnt_dec */
1154 SvREFCNT_dec(ARG2_HV);
1155 SvREFCNT_dec(ARG0_SV);
1159 PL_op = (OP*)ARG0_PTR;
1162 if ((PL_hints & HINT_LOCALIZE_HH)) {
1163 while (GvHV(PL_hintgv)) {
1164 HV *hv = GvHV(PL_hintgv);
1165 GvHV(PL_hintgv) = NULL;
1166 SvREFCNT_dec(MUTABLE_SV(hv));
1169 cophh_free(CopHINTHASH_get(&PL_compiling));
1170 CopHINTHASH_set(&PL_compiling, (COPHH*)ARG0_PTR);
1171 *(I32*)&PL_hints = ARG1_I32;
1172 if (PL_hints & HINT_LOCALIZE_HH) {
1173 SvREFCNT_dec(MUTABLE_SV(GvHV(PL_hintgv)));
1174 GvHV(PL_hintgv) = MUTABLE_HV(SSPOPPTR);
1176 if (!GvHV(PL_hintgv)) {
1177 /* Need to add a new one manually, else rv2hv can
1178 add one via GvHVn and it won't have the magic set. */
1179 HV *const hv = newHV();
1180 hv_magic(hv, NULL, PERL_MAGIC_hints);
1181 GvHV(PL_hintgv) = hv;
1183 assert(GvHV(PL_hintgv));
1186 PL_comppad = (PAD*)ARG0_PTR;
1188 PL_curpad = AvARRAY(PL_comppad);
1192 case SAVEt_PADSV_AND_MORTALIZE:
1196 svp = AvARRAY((PAD*)ARG1_PTR) + (PADOFFSET)arg0.any_uv;
1197 /* This mortalizing used to be done by POPLOOP() via itersave.
1198 But as we have all the information here, we can do it here,
1199 save even having to have itersave in the struct. */
1204 case SAVEt_SAVESWITCHSTACK:
1207 SWITCHSTACK(ARG0_AV, ARG1_AV);
1208 PL_curstackinfo->si_stack = ARG1_AV;
1211 case SAVEt_SET_SVFLAGS:
1212 SvFLAGS(ARG2_SV) &= ~((U32)ARG1_I32);
1213 SvFLAGS(ARG2_SV) |= (U32)ARG0_I32;
1216 /* These are only saved in mathoms.c */
1218 (void)sv_clear(ARG0_SV);
1220 case SAVEt_LONG: /* long reference */
1221 *(long*)ARG0_PTR = arg1.any_long;
1223 case SAVEt_IV: /* IV reference */
1224 *(IV*)ARG0_PTR = arg1.any_iv;
1227 case SAVEt_I16: /* I16 reference */
1228 *(I16*)ARG0_PTR = (I16)(uv >> 8);
1230 case SAVEt_I8: /* I8 reference */
1231 *(I8*)ARG0_PTR = (I8)(uv >> 8);
1233 case SAVEt_DESTRUCTOR:
1234 (*arg1.any_dptr)(ARG0_PTR);
1236 case SAVEt_COMPILE_WARNINGS:
1237 if (!specialWARN(PL_compiling.cop_warnings))
1238 PerlMemShared_free(PL_compiling.cop_warnings);
1240 PL_compiling.cop_warnings = (STRLEN*)ARG0_PTR;
1243 parser_free((yy_parser *) ARG0_PTR);
1245 case SAVEt_READONLY_OFF:
1246 SvREADONLY_off(ARG0_SV);
1249 Perl_croak(aTHX_ "panic: leave_scope inconsistency %u", type);
1257 Perl_cx_dump(pTHX_ PERL_CONTEXT *cx)
1261 PERL_ARGS_ASSERT_CX_DUMP;
1264 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]);
1265 if (CxTYPE(cx) != CXt_SUBST) {
1266 const char *gimme_text;
1267 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
1268 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%"UVxf"\n",
1269 PTR2UV(cx->blk_oldcop));
1270 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
1271 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
1272 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%"UVxf"\n",
1273 PTR2UV(cx->blk_oldpm));
1274 switch (cx->blk_gimme) {
1276 gimme_text = "VOID";
1279 gimme_text = "SCALAR";
1282 gimme_text = "LIST";
1285 gimme_text = "UNKNOWN";
1288 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", gimme_text);
1290 switch (CxTYPE(cx)) {
1295 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.CV = 0x%"UVxf"\n",
1296 PTR2UV(cx->blk_format.cv));
1297 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.GV = 0x%"UVxf"\n",
1298 PTR2UV(cx->blk_format.gv));
1299 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.DFOUTGV = 0x%"UVxf"\n",
1300 PTR2UV(cx->blk_format.dfoutgv));
1301 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.HASARGS = %d\n",
1302 (int)CxHASARGS(cx));
1303 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.RETOP = 0x%"UVxf"\n",
1304 PTR2UV(cx->blk_format.retop));
1307 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%"UVxf"\n",
1308 PTR2UV(cx->blk_sub.cv));
1309 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
1310 (long)cx->blk_sub.olddepth);
1311 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
1312 (int)CxHASARGS(cx));
1313 PerlIO_printf(Perl_debug_log, "BLK_SUB.LVAL = %d\n", (int)CxLVAL(cx));
1314 PerlIO_printf(Perl_debug_log, "BLK_SUB.RETOP = 0x%"UVxf"\n",
1315 PTR2UV(cx->blk_sub.retop));
1318 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
1319 (long)CxOLD_IN_EVAL(cx));
1320 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
1321 PL_op_name[CxOLD_OP_TYPE(cx)],
1322 PL_op_desc[CxOLD_OP_TYPE(cx)]);
1323 if (cx->blk_eval.old_namesv)
1324 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
1325 SvPVX_const(cx->blk_eval.old_namesv));
1326 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%"UVxf"\n",
1327 PTR2UV(cx->blk_eval.old_eval_root));
1328 PerlIO_printf(Perl_debug_log, "BLK_EVAL.RETOP = 0x%"UVxf"\n",
1329 PTR2UV(cx->blk_eval.retop));
1332 case CXt_LOOP_LAZYIV:
1333 case CXt_LOOP_LAZYSV:
1335 case CXt_LOOP_PLAIN:
1336 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n", CxLABEL(cx));
1337 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
1338 (long)cx->blk_loop.resetsp);
1339 PerlIO_printf(Perl_debug_log, "BLK_LOOP.MY_OP = 0x%"UVxf"\n",
1340 PTR2UV(cx->blk_loop.my_op));
1341 /* XXX: not accurate for LAZYSV/IV */
1342 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%"UVxf"\n",
1343 PTR2UV(cx->blk_loop.state_u.ary.ary));
1344 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
1345 (long)cx->blk_loop.state_u.ary.ix);
1346 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%"UVxf"\n",
1347 PTR2UV(CxITERVAR(cx)));
1351 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
1352 (long)cx->sb_iters);
1353 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
1354 (long)cx->sb_maxiters);
1355 PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n",
1356 (long)cx->sb_rflags);
1357 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
1359 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
1361 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%"UVxf"\n",
1362 PTR2UV(cx->sb_dstr));
1363 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%"UVxf"\n",
1364 PTR2UV(cx->sb_targ));
1365 PerlIO_printf(Perl_debug_log, "SB_S = 0x%"UVxf"\n",
1367 PerlIO_printf(Perl_debug_log, "SB_M = 0x%"UVxf"\n",
1369 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%"UVxf"\n",
1370 PTR2UV(cx->sb_strend));
1371 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%"UVxf"\n",
1372 PTR2UV(cx->sb_rxres));
1376 PERL_UNUSED_CONTEXT;
1377 PERL_UNUSED_ARG(cx);
1378 #endif /* DEBUGGING */
1383 * c-indentation-style: bsd
1385 * indent-tabs-mode: nil
1388 * ex: set ts=8 sts=4 sw=4 et: