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, SSize_t key)
605 PERL_ARGS_ASSERT_SAVE_ADELETE;
607 SvREFCNT_inc_void(av);
610 SS_ADD_IV(SAVEt_ADELETE);
615 Perl_save_destructor(pTHX_ DESTRUCTORFUNC_NOCONTEXT_t f, void* p)
620 PERL_ARGS_ASSERT_SAVE_DESTRUCTOR;
624 SS_ADD_UV(SAVEt_DESTRUCTOR);
629 Perl_save_destructor_x(pTHX_ DESTRUCTORFUNC_t f, void* p)
636 SS_ADD_UV(SAVEt_DESTRUCTOR_X);
641 Perl_save_hints(pTHX)
644 COPHH *save_cophh = cophh_copy(CopHINTHASH_get(&PL_compiling));
645 if (PL_hints & HINT_LOCALIZE_HH) {
646 HV *oldhh = GvHV(PL_hintgv);
647 save_pushptri32ptr(oldhh, PL_hints, save_cophh, SAVEt_HINTS);
648 GvHV(PL_hintgv) = NULL; /* in case copying dies */
649 GvHV(PL_hintgv) = hv_copy_hints_hv(oldhh);
651 save_pushi32ptr(PL_hints, save_cophh, SAVEt_HINTS);
656 S_save_pushptri32ptr(pTHX_ void *const ptr1, const I32 i, void *const ptr2,
668 Perl_save_aelem_flags(pTHX_ AV *av, SSize_t idx, SV **sptr,
674 PERL_ARGS_ASSERT_SAVE_AELEM_FLAGS;
677 SS_ADD_PTR(SvREFCNT_inc_simple(av));
679 SS_ADD_PTR(SvREFCNT_inc(*sptr));
680 SS_ADD_UV(SAVEt_AELEM);
682 /* The array needs to hold a reference count on its new element, so it
684 if (!AvREAL(av) && AvREIFY(av))
686 save_scalar_at(sptr, flags); /* XXX - FIXME - see #60360 */
687 if (flags & SAVEf_KEEPOLDELEM)
690 /* If we're localizing a tied array element, this new sv
691 * won't actually be stored in the array - so it won't get
692 * reaped when the localize ends. Ensure it gets reaped by
693 * mortifying it instead. DAPM */
694 if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied))
699 Perl_save_helem_flags(pTHX_ HV *hv, SV *key, SV **sptr, const U32 flags)
704 PERL_ARGS_ASSERT_SAVE_HELEM_FLAGS;
709 SS_ADD_PTR(SvREFCNT_inc_simple(hv));
710 SS_ADD_PTR(newSVsv(key));
711 SS_ADD_PTR(SvREFCNT_inc(*sptr));
712 SS_ADD_UV(SAVEt_HELEM);
715 save_scalar_at(sptr, flags);
716 if (flags & SAVEf_KEEPOLDELEM)
719 /* If we're localizing a tied hash element, this new sv
720 * won't actually be stored in the hash - so it won't get
721 * reaped when the localize ends. Ensure it gets reaped by
722 * mortifying it instead. DAPM */
723 if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
728 Perl_save_svref(pTHX_ SV **sptr)
732 PERL_ARGS_ASSERT_SAVE_SVREF;
735 save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_SVREF);
736 return save_scalar_at(sptr, SAVEf_SETMAGIC); /* XXX - FIXME - see #60360 */
740 Perl_save_alloc(pTHX_ I32 size, I32 pad)
743 const I32 start = pad + ((char*)&PL_savestack[PL_savestack_ix]
744 - (char*)PL_savestack);
745 const UV elems = 1 + ((size + pad - 1) / sizeof(*PL_savestack));
746 const UV elems_shifted = elems << SAVE_TIGHT_SHIFT;
748 if ((elems_shifted >> SAVE_TIGHT_SHIFT) != elems)
750 "panic: save_alloc elems %"UVuf" out of range (%"IVdf"-%"IVdf")",
751 elems, (IV)size, (IV)pad);
755 PL_savestack_ix += elems;
756 SSPUSHUV(SAVEt_ALLOC | elems_shifted);
762 #define ARG0_SV MUTABLE_SV(arg0.any_ptr)
763 #define ARG0_AV MUTABLE_AV(arg0.any_ptr)
764 #define ARG0_HV MUTABLE_HV(arg0.any_ptr)
765 #define ARG0_PTR arg0.any_ptr
766 #define ARG0_PV (char*)(arg0.any_ptr)
767 #define ARG0_PVP (char**)(arg0.any_ptr)
768 #define ARG0_I32 (arg0.any_i32)
770 #define ARG1_SV MUTABLE_SV(arg1.any_ptr)
771 #define ARG1_AV MUTABLE_AV(arg1.any_ptr)
772 #define ARG1_GV MUTABLE_GV(arg1.any_ptr)
773 #define ARG1_SVP (SV**)(arg1.any_ptr)
774 #define ARG1_PVP (char**)(arg1.any_ptr)
775 #define ARG1_PTR arg1.any_ptr
776 #define ARG1_PV (char*)(arg1.any_ptr)
777 #define ARG1_I32 (arg1.any_i32)
779 #define ARG2_SV MUTABLE_SV(arg2.any_ptr)
780 #define ARG2_AV MUTABLE_AV(arg2.any_ptr)
781 #define ARG2_HV MUTABLE_HV(arg2.any_ptr)
782 #define ARG2_GV MUTABLE_GV(arg2.any_ptr)
783 #define ARG2_PV (char*)(arg2.any_ptr)
786 Perl_leave_scope(pTHX_ I32 base)
790 /* Localise the effects of the TAINT_NOT inside the loop. */
791 bool was = TAINT_get;
793 ANY arg0, arg1, arg2;
795 /* these initialisations are logically unnecessary, but they shut up
796 * spurious 'may be used uninitialized' compiler warnings */
802 Perl_croak(aTHX_ "panic: corrupt saved stack index %ld", (long) base);
803 DEBUG_l(Perl_deb(aTHX_ "savestack: releasing items %ld -> %ld\n",
804 (long)PL_savestack_ix, (long)base));
805 while (PL_savestack_ix > base) {
815 I32 ix = PL_savestack_ix - 1;
816 ANY *p = &PL_savestack[ix];
818 type = (U8)uv & SAVE_MASK;
819 if (type > SAVEt_ARG0_MAX) {
822 if (type > SAVEt_ARG1_MAX) {
824 if (type > SAVEt_ARG2_MAX) {
830 PL_savestack_ix = ix;
834 case SAVEt_ITEM: /* normal string */
835 sv_replace(ARG1_SV, ARG0_SV);
836 if (SvSMAGICAL(ARG1_SV)) {
843 /* This would be a mathom, but Perl_save_svref() calls a static
844 function, S_save_scalar_at(), so has to stay in this file. */
845 case SAVEt_SVREF: /* scalar reference */
847 refsv = NULL; /* what to refcnt_dec */
850 case SAVEt_SV: /* scalar reference */
851 svp = &GvSV(ARG1_GV);
852 refsv = ARG1_SV; /* what to refcnt_dec */
855 SV * const sv = *svp;
858 if (SvSMAGICAL(ARG0_SV)) {
863 SvREFCNT_dec_NN(ARG0_SV);
867 case SAVEt_GENERIC_PVREF: /* generic pv */
868 if (*ARG0_PVP != ARG1_PV) {
873 case SAVEt_SHARED_PVREF: /* shared pv */
874 if (*ARG1_PVP != ARG0_PV) {
876 PerlMem_free(*ARG1_PVP);
878 PerlMemShared_free(*ARG1_PVP);
883 case SAVEt_GVSV: /* scalar slot in GV */
884 svp = &GvSV(ARG1_GV);
886 case SAVEt_GENERIC_SVREF: /* generic sv */
890 SV * const sv = *svp;
893 SvREFCNT_dec(ARG0_SV);
896 case SAVEt_GVSLOT: /* any slot in GV */
898 HV *const hv = GvSTASH(ARG2_GV);
900 if (hv && HvENAME(hv) && (
901 (ARG0_SV && SvTYPE(ARG0_SV) == SVt_PVCV)
902 || (*svp && SvTYPE(*svp) == SVt_PVCV)
905 if ((char *)svp < (char *)GvGP(ARG2_GV)
906 || (char *)svp > (char *)GvGP(ARG2_GV) + sizeof(struct gp)
907 || GvREFCNT(ARG2_GV) > 1)
909 else mro_method_changed_in(hv);
913 case SAVEt_AV: /* array reference */
914 SvREFCNT_dec(GvAV(ARG1_GV));
915 GvAV(ARG1_GV) = ARG0_AV;
916 if (SvSMAGICAL(ARG0_SV)) {
921 SvREFCNT_dec_NN(ARG1_GV);
923 case SAVEt_HV: /* hash reference */
924 SvREFCNT_dec(GvHV(ARG1_GV));
925 GvHV(ARG1_GV) = ARG0_HV;
926 if (SvSMAGICAL(ARG0_SV)) {
931 SvREFCNT_dec_NN(ARG1_GV);
933 case SAVEt_INT_SMALL:
934 *(int*)ARG0_PTR = (int)(uv >> SAVE_TIGHT_SHIFT);
936 case SAVEt_INT: /* int reference */
937 *(int*)ARG0_PTR = (int)ARG1_I32;
939 case SAVEt_STRLEN: /* STRLEN/size_t ref */
940 *(STRLEN*)ARG0_PTR = (STRLEN)arg1.any_iv;
942 case SAVEt_BOOL: /* bool reference */
943 *(bool*)ARG0_PTR = cBOOL(uv >> 8);
944 #ifdef NO_TAINT_SUPPORT
945 PERL_UNUSED_VAR(was);
947 if (ARG0_PTR == &(TAINT_get)) {
948 /* If we don't update <was>, to reflect what was saved on the
949 * stack for PL_tainted, then we will overwrite this attempt to
950 * restore it when we exit this routine. Note that this won't
951 * work if this value was saved in a wider-than necessary type,
953 was = *(bool*)ARG0_PTR;
957 case SAVEt_I32_SMALL:
958 *(I32*)ARG0_PTR = (I32)(uv >> SAVE_TIGHT_SHIFT);
960 case SAVEt_I32: /* I32 reference */
961 #ifdef PERL_DEBUG_READONLY_OPS
962 if (*(I32*)ARG0_PTR != ARG1_I32)
964 *(I32*)ARG0_PTR = ARG1_I32;
966 case SAVEt_SPTR: /* SV* reference */
967 *(SV**)(ARG0_PTR)= ARG1_SV;
969 case SAVEt_VPTR: /* random* reference */
970 case SAVEt_PPTR: /* char* reference */
973 case SAVEt_HPTR: /* HV* reference */
974 *(HV**)ARG0_PTR = MUTABLE_HV(ARG1_PTR);
976 case SAVEt_APTR: /* AV* reference */
977 *(AV**)ARG0_PTR = ARG1_AV;
979 case SAVEt_GP: /* scalar reference */
982 /* possibly taking a method out of circulation */
983 const bool had_method = !!GvCVu(ARG1_GV);
985 GvGP_set(ARG1_GV, (GP*)ARG0_PTR);
986 if ((hv=GvSTASH(ARG1_GV)) && HvENAME_get(hv)) {
987 if ( GvNAMELEN(ARG1_GV) == 3
988 && strnEQ(GvNAME(ARG1_GV), "ISA", 3)
990 mro_isa_changed_in(hv);
991 else if (had_method || GvCVu(ARG1_GV))
992 /* putting a method back into circulation ("local")*/
993 gv_method_changed(ARG1_GV);
995 SvREFCNT_dec_NN(ARG1_GV);
999 SvREFCNT_dec(ARG0_SV);
1001 case SAVEt_FREECOPHH:
1002 cophh_free((COPHH *)ARG0_PTR);
1004 case SAVEt_MORTALIZESV:
1005 sv_2mortal(ARG0_SV);
1008 ASSERT_CURPAD_LEGAL("SAVEt_FREEOP");
1009 op_free((OP*)ARG0_PTR);
1020 case SAVEt_CLEARPADRANGE:
1021 i = (I32)((uv >> SAVE_TIGHT_SHIFT) & OPpPADRANGE_COUNTMASK);
1022 svp = &PL_curpad[uv >>
1023 (OPpPADRANGE_COUNTSHIFT + SAVE_TIGHT_SHIFT)] + i - 1;
1026 svp = &PL_curpad[uv >> SAVE_TIGHT_SHIFT];
1029 for (; i; i--, svp--) {
1032 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1033 "Pad 0x%"UVxf"[0x%"UVxf"] clearsv: %ld sv=0x%"UVxf"<%"IVdf"> %s\n",
1034 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
1035 (long)(svp-PL_curpad), PTR2UV(sv), (IV)SvREFCNT(sv),
1036 (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) ? "clear" : "abandon"
1039 /* Can clear pad variable in place? */
1040 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
1042 * if a my variable that was made readonly is going out of
1043 * scope, we want to remove the readonlyness so that it can
1044 * go out of scope quietly
1046 if (SvPADMY(sv) && !SvFAKE(sv))
1049 if (SvTYPE(sv) == SVt_PVHV)
1050 Perl_hv_kill_backrefs(aTHX_ MUTABLE_HV(sv));
1053 sv_unmagic(sv, PERL_MAGIC_backref);
1054 if (SvTYPE(sv) != SVt_PVCV)
1057 if (SvTHINKFIRST(sv))
1058 sv_force_normal_flags(sv, SV_IMMEDIATE_UNREF
1061 switch (SvTYPE(sv)) {
1065 av_clear(MUTABLE_AV(sv));
1068 hv_clear(MUTABLE_HV(sv));
1072 HEK * const hek = CvNAME_HEK((CV *)sv);
1076 CvNAME_HEK_set(sv, hek);
1083 SvPADSTALE_on(sv); /* mark as no longer live */
1085 else { /* Someone has a claim on this, so abandon it. */
1086 assert( SvFLAGS(sv) & SVs_PADMY);
1087 assert(!(SvFLAGS(sv) & SVs_PADTMP));
1088 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
1089 case SVt_PVAV: *svp = MUTABLE_SV(newAV()); break;
1090 case SVt_PVHV: *svp = MUTABLE_SV(newHV()); break;
1094 *svp = newSV_type(SVt_PVCV);
1097 assert(CvNAMED(sv));
1098 CvNAME_HEK_set(*svp,
1099 share_hek_hek(CvNAME_HEK((CV *)sv)));
1102 default: *svp = newSV(0); break;
1104 SvREFCNT_dec_NN(sv); /* Cast current value to the winds. */
1105 /* preserve pad nature, but also mark as not live
1106 * for any closure capturing */
1107 SvFLAGS(*svp) |= (SVs_PADMY|SVs_PADSTALE);
1113 (void)hv_delete(ARG0_HV, ARG2_PV, ARG1_I32, G_DISCARD);
1114 SvREFCNT_dec(ARG0_HV);
1115 Safefree(arg2.any_ptr);
1118 (void)av_delete(ARG0_AV, arg1.any_iv, G_DISCARD);
1119 SvREFCNT_dec(ARG0_AV);
1121 case SAVEt_DESTRUCTOR_X:
1122 (*arg1.any_dxptr)(aTHX_ ARG0_PTR);
1124 case SAVEt_REGCONTEXT:
1125 /* regexp must have croaked */
1127 PL_savestack_ix -= uv >> SAVE_TIGHT_SHIFT;
1129 case SAVEt_STACK_POS: /* Position on Perl stack */
1130 PL_stack_sp = PL_stack_base + arg0.any_i32;
1132 case SAVEt_AELEM: /* array element */
1133 svp = av_fetch(ARG2_AV, arg1.any_iv, 1);
1134 if (!AvREAL(ARG2_AV) && AvREIFY(ARG2_AV)) /* undo reify guard */
1135 SvREFCNT_dec(ARG0_SV);
1137 SV * const sv = *svp;
1138 if (sv && sv != &PL_sv_undef) {
1139 if (SvTIED_mg((const SV *)ARG2_AV, PERL_MAGIC_tied))
1140 SvREFCNT_inc_void_NN(sv);
1145 SvREFCNT_dec(ARG2_AV);
1146 SvREFCNT_dec(ARG0_SV);
1148 case SAVEt_HELEM: /* hash element */
1150 HE * const he = hv_fetch_ent(ARG2_HV, ARG1_SV, 1, 0);
1151 SvREFCNT_dec(ARG1_SV);
1153 const SV * const oval = HeVAL(he);
1154 if (oval && oval != &PL_sv_undef) {
1156 if (SvTIED_mg((const SV *)ARG2_HV, PERL_MAGIC_tied))
1157 SvREFCNT_inc_void(*svp);
1158 refsv = ARG2_SV; /* what to refcnt_dec */
1162 SvREFCNT_dec(ARG2_HV);
1163 SvREFCNT_dec(ARG0_SV);
1167 PL_op = (OP*)ARG0_PTR;
1170 if ((PL_hints & HINT_LOCALIZE_HH)) {
1171 while (GvHV(PL_hintgv)) {
1172 HV *hv = GvHV(PL_hintgv);
1173 GvHV(PL_hintgv) = NULL;
1174 SvREFCNT_dec(MUTABLE_SV(hv));
1177 cophh_free(CopHINTHASH_get(&PL_compiling));
1178 CopHINTHASH_set(&PL_compiling, (COPHH*)ARG0_PTR);
1179 *(I32*)&PL_hints = ARG1_I32;
1180 if (PL_hints & HINT_LOCALIZE_HH) {
1181 SvREFCNT_dec(MUTABLE_SV(GvHV(PL_hintgv)));
1182 GvHV(PL_hintgv) = MUTABLE_HV(SSPOPPTR);
1184 if (!GvHV(PL_hintgv)) {
1185 /* Need to add a new one manually, else rv2hv can
1186 add one via GvHVn and it won't have the magic set. */
1187 HV *const hv = newHV();
1188 hv_magic(hv, NULL, PERL_MAGIC_hints);
1189 GvHV(PL_hintgv) = hv;
1191 assert(GvHV(PL_hintgv));
1194 PL_comppad = (PAD*)ARG0_PTR;
1196 PL_curpad = AvARRAY(PL_comppad);
1200 case SAVEt_PADSV_AND_MORTALIZE:
1204 svp = AvARRAY((PAD*)ARG1_PTR) + (PADOFFSET)arg0.any_uv;
1205 /* This mortalizing used to be done by POPLOOP() via itersave.
1206 But as we have all the information here, we can do it here,
1207 save even having to have itersave in the struct. */
1212 case SAVEt_SAVESWITCHSTACK:
1215 SWITCHSTACK(ARG0_AV, ARG1_AV);
1216 PL_curstackinfo->si_stack = ARG1_AV;
1219 case SAVEt_SET_SVFLAGS:
1220 SvFLAGS(ARG2_SV) &= ~((U32)ARG1_I32);
1221 SvFLAGS(ARG2_SV) |= (U32)ARG0_I32;
1224 /* These are only saved in mathoms.c */
1226 (void)sv_clear(ARG0_SV);
1228 case SAVEt_LONG: /* long reference */
1229 *(long*)ARG0_PTR = arg1.any_long;
1231 case SAVEt_IV: /* IV reference */
1232 *(IV*)ARG0_PTR = arg1.any_iv;
1235 case SAVEt_I16: /* I16 reference */
1236 *(I16*)ARG0_PTR = (I16)(uv >> 8);
1238 case SAVEt_I8: /* I8 reference */
1239 *(I8*)ARG0_PTR = (I8)(uv >> 8);
1241 case SAVEt_DESTRUCTOR:
1242 (*arg1.any_dptr)(ARG0_PTR);
1244 case SAVEt_COMPILE_WARNINGS:
1245 if (!specialWARN(PL_compiling.cop_warnings))
1246 PerlMemShared_free(PL_compiling.cop_warnings);
1248 PL_compiling.cop_warnings = (STRLEN*)ARG0_PTR;
1251 parser_free((yy_parser *) ARG0_PTR);
1253 case SAVEt_READONLY_OFF:
1254 SvREADONLY_off(ARG0_SV);
1257 Perl_croak(aTHX_ "panic: leave_scope inconsistency %u", type);
1265 Perl_cx_dump(pTHX_ PERL_CONTEXT *cx)
1269 PERL_ARGS_ASSERT_CX_DUMP;
1272 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]);
1273 if (CxTYPE(cx) != CXt_SUBST) {
1274 const char *gimme_text;
1275 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
1276 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%"UVxf"\n",
1277 PTR2UV(cx->blk_oldcop));
1278 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
1279 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
1280 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%"UVxf"\n",
1281 PTR2UV(cx->blk_oldpm));
1282 switch (cx->blk_gimme) {
1284 gimme_text = "VOID";
1287 gimme_text = "SCALAR";
1290 gimme_text = "LIST";
1293 gimme_text = "UNKNOWN";
1296 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", gimme_text);
1298 switch (CxTYPE(cx)) {
1303 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.CV = 0x%"UVxf"\n",
1304 PTR2UV(cx->blk_format.cv));
1305 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.GV = 0x%"UVxf"\n",
1306 PTR2UV(cx->blk_format.gv));
1307 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.DFOUTGV = 0x%"UVxf"\n",
1308 PTR2UV(cx->blk_format.dfoutgv));
1309 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.HASARGS = %d\n",
1310 (int)CxHASARGS(cx));
1311 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.RETOP = 0x%"UVxf"\n",
1312 PTR2UV(cx->blk_format.retop));
1315 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%"UVxf"\n",
1316 PTR2UV(cx->blk_sub.cv));
1317 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
1318 (long)cx->blk_sub.olddepth);
1319 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
1320 (int)CxHASARGS(cx));
1321 PerlIO_printf(Perl_debug_log, "BLK_SUB.LVAL = %d\n", (int)CxLVAL(cx));
1322 PerlIO_printf(Perl_debug_log, "BLK_SUB.RETOP = 0x%"UVxf"\n",
1323 PTR2UV(cx->blk_sub.retop));
1326 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
1327 (long)CxOLD_IN_EVAL(cx));
1328 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
1329 PL_op_name[CxOLD_OP_TYPE(cx)],
1330 PL_op_desc[CxOLD_OP_TYPE(cx)]);
1331 if (cx->blk_eval.old_namesv)
1332 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
1333 SvPVX_const(cx->blk_eval.old_namesv));
1334 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%"UVxf"\n",
1335 PTR2UV(cx->blk_eval.old_eval_root));
1336 PerlIO_printf(Perl_debug_log, "BLK_EVAL.RETOP = 0x%"UVxf"\n",
1337 PTR2UV(cx->blk_eval.retop));
1340 case CXt_LOOP_LAZYIV:
1341 case CXt_LOOP_LAZYSV:
1343 case CXt_LOOP_PLAIN:
1344 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n", CxLABEL(cx));
1345 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
1346 (long)cx->blk_loop.resetsp);
1347 PerlIO_printf(Perl_debug_log, "BLK_LOOP.MY_OP = 0x%"UVxf"\n",
1348 PTR2UV(cx->blk_loop.my_op));
1349 /* XXX: not accurate for LAZYSV/IV */
1350 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%"UVxf"\n",
1351 PTR2UV(cx->blk_loop.state_u.ary.ary));
1352 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
1353 (long)cx->blk_loop.state_u.ary.ix);
1354 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%"UVxf"\n",
1355 PTR2UV(CxITERVAR(cx)));
1359 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
1360 (long)cx->sb_iters);
1361 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
1362 (long)cx->sb_maxiters);
1363 PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n",
1364 (long)cx->sb_rflags);
1365 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
1367 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
1369 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%"UVxf"\n",
1370 PTR2UV(cx->sb_dstr));
1371 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%"UVxf"\n",
1372 PTR2UV(cx->sb_targ));
1373 PerlIO_printf(Perl_debug_log, "SB_S = 0x%"UVxf"\n",
1375 PerlIO_printf(Perl_debug_log, "SB_M = 0x%"UVxf"\n",
1377 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%"UVxf"\n",
1378 PTR2UV(cx->sb_strend));
1379 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%"UVxf"\n",
1380 PTR2UV(cx->sb_rxres));
1384 PERL_UNUSED_CONTEXT;
1385 PERL_UNUSED_ARG(cx);
1386 #endif /* DEBUGGING */
1391 * c-indentation-style: bsd
1393 * indent-tabs-mode: nil
1396 * ex: set ts=8 sts=4 sw=4 et: