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)
32 PERL_ARGS_ASSERT_STACK_GROW;
35 #ifndef STRESS_REALLOC
36 av_extend(PL_curstack, (p - PL_stack_base) + (n) + 128);
38 av_extend(PL_curstack, (p - PL_stack_base) + (n) + 1);
43 #ifndef STRESS_REALLOC
44 #define GROW(old) ((old) * 3 / 2)
46 #define GROW(old) ((old) + 1)
50 Perl_new_stackinfo(pTHX_ I32 stitems, I32 cxitems)
54 si->si_stack = newAV();
55 AvREAL_off(si->si_stack);
56 av_extend(si->si_stack, stitems > 0 ? stitems-1 : 0);
57 AvALLOC(si->si_stack)[0] = &PL_sv_undef;
58 AvFILLp(si->si_stack) = 0;
61 si->si_cxmax = cxitems - 1;
63 si->si_type = PERLSI_UNDEF;
64 Newx(si->si_cxstack, cxitems, PERL_CONTEXT);
65 /* Without any kind of initialising PUSHSUBST()
66 * in pp_subst() will read uninitialised heap. */
67 PoisonNew(si->si_cxstack, cxitems, PERL_CONTEXT);
74 const IV old_max = cxstack_max;
75 cxstack_max = GROW(cxstack_max);
76 Renew(cxstack, cxstack_max + 1, PERL_CONTEXT);
77 /* Without any kind of initialising deep enough recursion
78 * will end up reading uninitialised PERL_CONTEXTs. */
79 PoisonNew(cxstack + old_max + 1, cxstack_max - old_max, PERL_CONTEXT);
80 return cxstack_ix + 1;
86 if (UNLIKELY(PL_scopestack_ix == PL_scopestack_max)) {
87 PL_scopestack_max = GROW(PL_scopestack_max);
88 Renew(PL_scopestack, PL_scopestack_max, I32);
90 Renew(PL_scopestack_name, PL_scopestack_max, const char*);
94 PL_scopestack_name[PL_scopestack_ix] = "unknown";
96 PL_scopestack[PL_scopestack_ix++] = PL_savestack_ix;
103 const I32 oldsave = PL_scopestack[--PL_scopestack_ix];
104 LEAVE_SCOPE(oldsave);
108 Perl_markstack_grow(pTHX)
110 const I32 oldmax = PL_markstack_max - PL_markstack;
111 const I32 newmax = GROW(oldmax);
113 Renew(PL_markstack, newmax, I32);
114 PL_markstack_max = PL_markstack + newmax;
115 PL_markstack_ptr = PL_markstack + oldmax;
116 return PL_markstack_ptr;
120 Perl_savestack_grow(pTHX)
122 PL_savestack_max = GROW(PL_savestack_max) + 4;
123 Renew(PL_savestack, PL_savestack_max, ANY);
127 Perl_savestack_grow_cnt(pTHX_ I32 need)
129 PL_savestack_max = PL_savestack_ix + need;
130 Renew(PL_savestack, PL_savestack_max, ANY);
136 Perl_tmps_grow(pTHX_ SSize_t n)
138 #ifndef STRESS_REALLOC
140 n = (PL_tmps_max < 512) ? 128 : 512;
142 PL_tmps_max = PL_tmps_ix + n + 1;
143 Renew(PL_tmps_stack, PL_tmps_max, SV*);
150 /* XXX should tmps_floor live in cxstack? */
151 const SSize_t myfloor = PL_tmps_floor;
152 while (PL_tmps_ix > myfloor) { /* clean up after last statement */
153 SV* const sv = PL_tmps_stack[PL_tmps_ix--];
155 PoisonWith(PL_tmps_stack + PL_tmps_ix + 1, 1, SV *, 0xAB);
157 if (LIKELY(sv && sv != &PL_sv_undef)) {
159 SvREFCNT_dec_NN(sv); /* note, can modify tmps_ix!!! */
165 S_save_scalar_at(pTHX_ SV **sptr, const U32 flags)
170 PERL_ARGS_ASSERT_SAVE_SCALAR_AT;
173 sv = (flags & SAVEf_KEEPOLDELEM) ? osv : (*sptr = newSV(0));
175 if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv)) {
176 if (SvGMAGICAL(osv)) {
177 SvFLAGS(osv) |= (SvFLAGS(osv) &
178 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
180 if (!(flags & SAVEf_KEEPOLDELEM))
181 mg_localize(osv, sv, cBOOL(flags & SAVEf_SETMAGIC));
188 Perl_save_pushptrptr(pTHX_ void *const ptr1, void *const ptr2, const int type)
198 Perl_save_scalar(pTHX_ GV *gv)
200 SV ** const sptr = &GvSVn(gv);
202 PERL_ARGS_ASSERT_SAVE_SCALAR;
204 if (UNLIKELY(SvGMAGICAL(*sptr))) {
209 save_pushptrptr(SvREFCNT_inc_simple(gv), SvREFCNT_inc(*sptr), SAVEt_SV);
210 return save_scalar_at(sptr, SAVEf_SETMAGIC); /* XXX - FIXME - see #60360 */
213 /* Like save_sptr(), but also SvREFCNT_dec()s the new value. Can be used to
214 * restore a global SV to its prior contents, freeing new value. */
216 Perl_save_generic_svref(pTHX_ SV **sptr)
218 PERL_ARGS_ASSERT_SAVE_GENERIC_SVREF;
220 save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_GENERIC_SVREF);
223 /* Like save_pptr(), but also Safefree()s the new value if it is different
224 * from the old one. Can be used to restore a global char* to its prior
225 * contents, freeing new value. */
227 Perl_save_generic_pvref(pTHX_ char **str)
229 PERL_ARGS_ASSERT_SAVE_GENERIC_PVREF;
231 save_pushptrptr(*str, str, SAVEt_GENERIC_PVREF);
234 /* Like save_generic_pvref(), but uses PerlMemShared_free() rather than Safefree().
235 * Can be used to restore a shared global char* to its prior
236 * contents, freeing new value. */
238 Perl_save_shared_pvref(pTHX_ char **str)
240 PERL_ARGS_ASSERT_SAVE_SHARED_PVREF;
242 save_pushptrptr(str, *str, SAVEt_SHARED_PVREF);
245 /* set the SvFLAGS specified by mask to the values in val */
248 Perl_save_set_svflags(pTHX_ SV* sv, U32 mask, U32 val)
252 PERL_ARGS_ASSERT_SAVE_SET_SVFLAGS;
257 SS_ADD_UV(SAVEt_SET_SVFLAGS);
262 Perl_save_gp(pTHX_ GV *gv, I32 empty)
264 PERL_ARGS_ASSERT_SAVE_GP;
266 save_pushptrptr(SvREFCNT_inc(gv), GvGP(gv), SAVEt_GP);
269 GP *gp = Perl_newGP(aTHX_ gv);
270 HV * const stash = GvSTASH(gv);
271 bool isa_changed = 0;
273 if (stash && HvENAME(stash)) {
274 if (GvNAMELEN(gv) == 3 && strnEQ(GvNAME(gv), "ISA", 3))
277 /* taking a method out of circulation ("local")*/
278 mro_method_changed_in(stash);
280 if (GvIOp(gv) && (IoFLAGS(GvIOp(gv)) & IOf_ARGV)) {
282 IoFLAGS(gp->gp_io) |= IOf_ARGV|IOf_START;
285 if (isa_changed) mro_isa_changed_in(stash);
294 Perl_save_ary(pTHX_ GV *gv)
296 AV * const oav = GvAVn(gv);
299 PERL_ARGS_ASSERT_SAVE_ARY;
301 if (UNLIKELY(!AvREAL(oav) && AvREIFY(oav)))
303 save_pushptrptr(SvREFCNT_inc_simple_NN(gv), oav, SAVEt_AV);
307 if (UNLIKELY(SvMAGIC(oav)))
308 mg_localize(MUTABLE_SV(oav), MUTABLE_SV(av), TRUE);
313 Perl_save_hash(pTHX_ GV *gv)
317 PERL_ARGS_ASSERT_SAVE_HASH;
320 SvREFCNT_inc_simple_NN(gv), (ohv = GvHVn(gv)), SAVEt_HV
325 if (UNLIKELY(SvMAGIC(ohv)))
326 mg_localize(MUTABLE_SV(ohv), MUTABLE_SV(hv), TRUE);
331 Perl_save_item(pTHX_ SV *item)
333 SV * const sv = newSVsv(item);
335 PERL_ARGS_ASSERT_SAVE_ITEM;
337 save_pushptrptr(item, /* remember the pointer */
338 sv, /* remember the value */
343 Perl_save_bool(pTHX_ bool *boolp)
347 PERL_ARGS_ASSERT_SAVE_BOOL;
350 SS_ADD_UV(SAVEt_BOOL | (*boolp << 8));
355 Perl_save_pushi32ptr(pTHX_ const I32 i, void *const ptr, const int type)
366 Perl_save_int(pTHX_ int *intp)
369 UV type = ((UV)((UV)i << SAVE_TIGHT_SHIFT) | SAVEt_INT_SMALL);
373 PERL_ARGS_ASSERT_SAVE_INT;
375 if (UNLIKELY((int)(type >> SAVE_TIGHT_SHIFT) != i)) {
386 Perl_save_I8(pTHX_ I8 *bytep)
390 PERL_ARGS_ASSERT_SAVE_I8;
393 SS_ADD_UV(SAVEt_I8 | ((UV)*bytep << 8));
398 Perl_save_I16(pTHX_ I16 *intp)
402 PERL_ARGS_ASSERT_SAVE_I16;
405 SS_ADD_UV(SAVEt_I16 | ((UV)*intp << 8));
410 Perl_save_I32(pTHX_ I32 *intp)
413 UV type = ((I32)((U32)i << SAVE_TIGHT_SHIFT) | SAVEt_I32_SMALL);
417 PERL_ARGS_ASSERT_SAVE_I32;
419 if (UNLIKELY((I32)(type >> SAVE_TIGHT_SHIFT) != i)) {
430 Perl_save_strlen(pTHX_ STRLEN *ptr)
434 PERL_ARGS_ASSERT_SAVE_STRLEN;
438 SS_ADD_UV(SAVEt_STRLEN);
442 /* Cannot use save_sptr() to store a char* since the SV** cast will
443 * force word-alignment and we'll miss the pointer.
446 Perl_save_pptr(pTHX_ char **pptr)
448 PERL_ARGS_ASSERT_SAVE_PPTR;
450 save_pushptrptr(*pptr, pptr, SAVEt_PPTR);
454 Perl_save_vptr(pTHX_ void *ptr)
456 PERL_ARGS_ASSERT_SAVE_VPTR;
458 save_pushptrptr(*(char**)ptr, ptr, SAVEt_VPTR);
462 Perl_save_sptr(pTHX_ SV **sptr)
464 PERL_ARGS_ASSERT_SAVE_SPTR;
466 save_pushptrptr(*sptr, sptr, SAVEt_SPTR);
470 Perl_save_padsv_and_mortalize(pTHX_ PADOFFSET off)
474 ASSERT_CURPAD_ACTIVE("save_padsv");
475 SS_ADD_PTR(SvREFCNT_inc_simple_NN(PL_curpad[off]));
476 SS_ADD_PTR(PL_comppad);
478 SS_ADD_UV(SAVEt_PADSV_AND_MORTALIZE);
483 Perl_save_hptr(pTHX_ HV **hptr)
485 PERL_ARGS_ASSERT_SAVE_HPTR;
487 save_pushptrptr(*hptr, hptr, SAVEt_HPTR);
491 Perl_save_aptr(pTHX_ AV **aptr)
493 PERL_ARGS_ASSERT_SAVE_APTR;
495 save_pushptrptr(*aptr, aptr, SAVEt_APTR);
499 Perl_save_pushptr(pTHX_ void *const ptr, const int type)
508 Perl_save_clearsv(pTHX_ SV **svp)
510 const UV offset = svp - PL_curpad;
511 const UV offset_shifted = offset << SAVE_TIGHT_SHIFT;
513 PERL_ARGS_ASSERT_SAVE_CLEARSV;
515 ASSERT_CURPAD_ACTIVE("save_clearsv");
516 SvPADSTALE_off(*svp); /* mark lexical as active */
517 if (UNLIKELY((offset_shifted >> SAVE_TIGHT_SHIFT) != offset)) {
518 Perl_croak(aTHX_ "panic: pad offset %"UVuf" out of range (%p-%p)",
519 offset, svp, PL_curpad);
524 SS_ADD_UV(offset_shifted | SAVEt_CLEARSV);
530 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, SSize_t key)
557 PERL_ARGS_ASSERT_SAVE_ADELETE;
559 SvREFCNT_inc_void(av);
562 SS_ADD_IV(SAVEt_ADELETE);
567 Perl_save_destructor(pTHX_ DESTRUCTORFUNC_NOCONTEXT_t f, void* p)
570 PERL_ARGS_ASSERT_SAVE_DESTRUCTOR;
574 SS_ADD_UV(SAVEt_DESTRUCTOR);
579 Perl_save_destructor_x(pTHX_ DESTRUCTORFUNC_t f, void* p)
585 SS_ADD_UV(SAVEt_DESTRUCTOR_X);
590 Perl_save_hints(pTHX)
592 COPHH *save_cophh = cophh_copy(CopHINTHASH_get(&PL_compiling));
593 if (PL_hints & HINT_LOCALIZE_HH) {
594 HV *oldhh = GvHV(PL_hintgv);
595 save_pushptri32ptr(oldhh, PL_hints, save_cophh, SAVEt_HINTS);
596 GvHV(PL_hintgv) = NULL; /* in case copying dies */
597 GvHV(PL_hintgv) = hv_copy_hints_hv(oldhh);
599 save_pushi32ptr(PL_hints, save_cophh, SAVEt_HINTS);
604 S_save_pushptri32ptr(pTHX_ void *const ptr1, const I32 i, void *const ptr2,
616 Perl_save_aelem_flags(pTHX_ AV *av, SSize_t idx, SV **sptr,
622 PERL_ARGS_ASSERT_SAVE_AELEM_FLAGS;
625 SS_ADD_PTR(SvREFCNT_inc_simple(av));
627 SS_ADD_PTR(SvREFCNT_inc(*sptr));
628 SS_ADD_UV(SAVEt_AELEM);
630 /* The array needs to hold a reference count on its new element, so it
632 if (UNLIKELY(!AvREAL(av) && AvREIFY(av)))
634 save_scalar_at(sptr, flags); /* XXX - FIXME - see #60360 */
635 if (flags & SAVEf_KEEPOLDELEM)
638 /* If we're localizing a tied array element, this new sv
639 * won't actually be stored in the array - so it won't get
640 * reaped when the localize ends. Ensure it gets reaped by
641 * mortifying it instead. DAPM */
642 if (UNLIKELY(SvTIED_mg((const SV *)av, PERL_MAGIC_tied)))
647 Perl_save_helem_flags(pTHX_ HV *hv, SV *key, SV **sptr, const U32 flags)
651 PERL_ARGS_ASSERT_SAVE_HELEM_FLAGS;
656 SS_ADD_PTR(SvREFCNT_inc_simple(hv));
657 SS_ADD_PTR(newSVsv(key));
658 SS_ADD_PTR(SvREFCNT_inc(*sptr));
659 SS_ADD_UV(SAVEt_HELEM);
662 save_scalar_at(sptr, flags);
663 if (flags & SAVEf_KEEPOLDELEM)
666 /* If we're localizing a tied hash element, this new sv
667 * won't actually be stored in the hash - so it won't get
668 * reaped when the localize ends. Ensure it gets reaped by
669 * mortifying it instead. DAPM */
670 if (UNLIKELY(SvTIED_mg((const SV *)hv, PERL_MAGIC_tied)))
675 Perl_save_svref(pTHX_ SV **sptr)
677 PERL_ARGS_ASSERT_SAVE_SVREF;
680 save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_SVREF);
681 return save_scalar_at(sptr, SAVEf_SETMAGIC); /* XXX - FIXME - see #60360 */
685 Perl_save_alloc(pTHX_ I32 size, I32 pad)
687 const I32 start = pad + ((char*)&PL_savestack[PL_savestack_ix]
688 - (char*)PL_savestack);
689 const UV elems = 1 + ((size + pad - 1) / sizeof(*PL_savestack));
690 const UV elems_shifted = elems << SAVE_TIGHT_SHIFT;
692 if (UNLIKELY((elems_shifted >> SAVE_TIGHT_SHIFT) != elems))
694 "panic: save_alloc elems %"UVuf" out of range (%"IVdf"-%"IVdf")",
695 elems, (IV)size, (IV)pad);
699 PL_savestack_ix += elems;
700 SSPUSHUV(SAVEt_ALLOC | elems_shifted);
706 #define ARG0_SV MUTABLE_SV(arg0.any_ptr)
707 #define ARG0_AV MUTABLE_AV(arg0.any_ptr)
708 #define ARG0_HV MUTABLE_HV(arg0.any_ptr)
709 #define ARG0_PTR arg0.any_ptr
710 #define ARG0_PV (char*)(arg0.any_ptr)
711 #define ARG0_PVP (char**)(arg0.any_ptr)
712 #define ARG0_I32 (arg0.any_i32)
714 #define ARG1_SV MUTABLE_SV(arg1.any_ptr)
715 #define ARG1_AV MUTABLE_AV(arg1.any_ptr)
716 #define ARG1_GV MUTABLE_GV(arg1.any_ptr)
717 #define ARG1_SVP (SV**)(arg1.any_ptr)
718 #define ARG1_PVP (char**)(arg1.any_ptr)
719 #define ARG1_PTR arg1.any_ptr
720 #define ARG1_PV (char*)(arg1.any_ptr)
721 #define ARG1_I32 (arg1.any_i32)
723 #define ARG2_SV MUTABLE_SV(arg2.any_ptr)
724 #define ARG2_AV MUTABLE_AV(arg2.any_ptr)
725 #define ARG2_HV MUTABLE_HV(arg2.any_ptr)
726 #define ARG2_GV MUTABLE_GV(arg2.any_ptr)
727 #define ARG2_PV (char*)(arg2.any_ptr)
730 Perl_leave_scope(pTHX_ I32 base)
732 /* Localise the effects of the TAINT_NOT inside the loop. */
733 bool was = TAINT_get;
735 ANY arg0, arg1, arg2;
737 /* these initialisations are logically unnecessary, but they shut up
738 * spurious 'may be used uninitialized' compiler warnings */
743 if (UNLIKELY(base < -1))
744 Perl_croak(aTHX_ "panic: corrupt saved stack index %ld", (long) base);
745 DEBUG_l(Perl_deb(aTHX_ "savestack: releasing items %ld -> %ld\n",
746 (long)PL_savestack_ix, (long)base));
747 while (PL_savestack_ix > base) {
757 I32 ix = PL_savestack_ix - 1;
758 ANY *p = &PL_savestack[ix];
760 type = (U8)uv & SAVE_MASK;
761 if (type > SAVEt_ARG0_MAX) {
764 if (type > SAVEt_ARG1_MAX) {
766 if (type > SAVEt_ARG2_MAX) {
772 PL_savestack_ix = ix;
776 case SAVEt_ITEM: /* normal string */
777 sv_replace(ARG1_SV, ARG0_SV);
778 if (UNLIKELY(SvSMAGICAL(ARG1_SV))) {
785 /* This would be a mathom, but Perl_save_svref() calls a static
786 function, S_save_scalar_at(), so has to stay in this file. */
787 case SAVEt_SVREF: /* scalar reference */
789 refsv = NULL; /* what to refcnt_dec */
792 case SAVEt_SV: /* scalar reference */
793 svp = &GvSV(ARG1_GV);
794 refsv = ARG1_SV; /* what to refcnt_dec */
797 SV * const sv = *svp;
800 if (UNLIKELY(SvSMAGICAL(ARG0_SV))) {
805 SvREFCNT_dec_NN(ARG0_SV);
809 case SAVEt_GENERIC_PVREF: /* generic pv */
810 if (*ARG0_PVP != ARG1_PV) {
815 case SAVEt_SHARED_PVREF: /* shared pv */
816 if (*ARG1_PVP != ARG0_PV) {
818 PerlMem_free(*ARG1_PVP);
820 PerlMemShared_free(*ARG1_PVP);
825 case SAVEt_GVSV: /* scalar slot in GV */
826 svp = &GvSV(ARG1_GV);
828 case SAVEt_GENERIC_SVREF: /* generic sv */
832 SV * const sv = *svp;
835 SvREFCNT_dec(ARG0_SV);
838 case SAVEt_GVSLOT: /* any slot in GV */
840 HV *const hv = GvSTASH(ARG2_GV);
842 if (hv && HvENAME(hv) && (
843 (ARG0_SV && SvTYPE(ARG0_SV) == SVt_PVCV)
844 || (*svp && SvTYPE(*svp) == SVt_PVCV)
847 if ((char *)svp < (char *)GvGP(ARG2_GV)
848 || (char *)svp > (char *)GvGP(ARG2_GV) + sizeof(struct gp)
849 || GvREFCNT(ARG2_GV) > 1)
851 else mro_method_changed_in(hv);
855 case SAVEt_AV: /* array reference */
856 SvREFCNT_dec(GvAV(ARG1_GV));
857 GvAV(ARG1_GV) = ARG0_AV;
858 if (UNLIKELY(SvSMAGICAL(ARG0_SV))) {
863 SvREFCNT_dec_NN(ARG1_GV);
865 case SAVEt_HV: /* hash reference */
866 SvREFCNT_dec(GvHV(ARG1_GV));
867 GvHV(ARG1_GV) = ARG0_HV;
868 if (UNLIKELY(SvSMAGICAL(ARG0_SV))) {
873 SvREFCNT_dec_NN(ARG1_GV);
875 case SAVEt_INT_SMALL:
876 *(int*)ARG0_PTR = (int)(uv >> SAVE_TIGHT_SHIFT);
878 case SAVEt_INT: /* int reference */
879 *(int*)ARG0_PTR = (int)ARG1_I32;
881 case SAVEt_STRLEN: /* STRLEN/size_t ref */
882 *(STRLEN*)ARG0_PTR = (STRLEN)arg1.any_iv;
884 case SAVEt_BOOL: /* bool reference */
885 *(bool*)ARG0_PTR = cBOOL(uv >> 8);
886 #ifdef NO_TAINT_SUPPORT
887 PERL_UNUSED_VAR(was);
889 if (UNLIKELY(ARG0_PTR == &(TAINT_get))) {
890 /* If we don't update <was>, to reflect what was saved on the
891 * stack for PL_tainted, then we will overwrite this attempt to
892 * restore it when we exit this routine. Note that this won't
893 * work if this value was saved in a wider-than necessary type,
895 was = *(bool*)ARG0_PTR;
899 case SAVEt_I32_SMALL:
900 *(I32*)ARG0_PTR = (I32)(uv >> SAVE_TIGHT_SHIFT);
902 case SAVEt_I32: /* I32 reference */
903 #ifdef PERL_DEBUG_READONLY_OPS
904 if (*(I32*)ARG0_PTR != ARG1_I32)
906 *(I32*)ARG0_PTR = ARG1_I32;
908 case SAVEt_SPTR: /* SV* reference */
909 *(SV**)(ARG0_PTR)= ARG1_SV;
911 case SAVEt_VPTR: /* random* reference */
912 case SAVEt_PPTR: /* char* reference */
915 case SAVEt_HPTR: /* HV* reference */
916 *(HV**)ARG0_PTR = MUTABLE_HV(ARG1_PTR);
918 case SAVEt_APTR: /* AV* reference */
919 *(AV**)ARG0_PTR = ARG1_AV;
921 case SAVEt_GP: /* scalar reference */
924 /* possibly taking a method out of circulation */
925 const bool had_method = !!GvCVu(ARG1_GV);
927 GvGP_set(ARG1_GV, (GP*)ARG0_PTR);
928 if ((hv=GvSTASH(ARG1_GV)) && HvENAME_get(hv)) {
929 if ( GvNAMELEN(ARG1_GV) == 3
930 && strnEQ(GvNAME(ARG1_GV), "ISA", 3)
932 mro_isa_changed_in(hv);
933 else if (had_method || GvCVu(ARG1_GV))
934 /* putting a method back into circulation ("local")*/
935 gv_method_changed(ARG1_GV);
937 SvREFCNT_dec_NN(ARG1_GV);
941 SvREFCNT_dec(ARG0_SV);
943 case SAVEt_FREECOPHH:
944 cophh_free((COPHH *)ARG0_PTR);
946 case SAVEt_MORTALIZESV:
950 ASSERT_CURPAD_LEGAL("SAVEt_FREEOP");
951 op_free((OP*)ARG0_PTR);
962 case SAVEt_CLEARPADRANGE:
963 i = (I32)((uv >> SAVE_TIGHT_SHIFT) & OPpPADRANGE_COUNTMASK);
964 svp = &PL_curpad[uv >>
965 (OPpPADRANGE_COUNTSHIFT + SAVE_TIGHT_SHIFT)] + i - 1;
968 svp = &PL_curpad[uv >> SAVE_TIGHT_SHIFT];
971 for (; i; i--, svp--) {
974 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
975 "Pad 0x%"UVxf"[0x%"UVxf"] clearsv: %ld sv=0x%"UVxf"<%"IVdf"> %s\n",
976 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
977 (long)(svp-PL_curpad), PTR2UV(sv), (IV)SvREFCNT(sv),
978 (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) ? "clear" : "abandon"
983 /* Can clear pad variable in place? */
984 if (SvREFCNT(sv) == 1 && !SvOBJECT(sv)) {
986 /* these flags are the union of all the relevant flags
987 * in the individual conditions within */
988 if (UNLIKELY(SvFLAGS(sv) & (
989 SVf_READONLY /* for SvREADONLY_off() */
990 | (SVs_GMG|SVs_SMG|SVs_RMG) /* SvMAGICAL() */
994 /* if a my variable that was made readonly is
995 * going out of scope, we want to remove the
996 * readonlyness so that it can go out of scope
999 if (SvREADONLY(sv) && !SvFAKE(sv))
1002 if (SvOOK(sv)) { /* OOK or HvAUX */
1003 if (SvTYPE(sv) == SVt_PVHV)
1004 Perl_hv_kill_backrefs(aTHX_ MUTABLE_HV(sv));
1009 if (SvMAGICAL(sv)) {
1010 /* note that backrefs (either in HvAUX or magic)
1011 * must be removed before other magic */
1012 sv_unmagic(sv, PERL_MAGIC_backref);
1013 if (SvTYPE(sv) != SVt_PVCV)
1016 if (SvTHINKFIRST(sv))
1017 sv_force_normal_flags(sv, SV_IMMEDIATE_UNREF
1021 switch (SvTYPE(sv)) {
1025 av_clear(MUTABLE_AV(sv));
1028 hv_clear(MUTABLE_HV(sv));
1032 HEK * const hek = CvNAME_HEK((CV *)sv);
1036 CvNAME_HEK_set(sv, hek);
1040 /* This looks odd, but these two macros are for use in
1041 expressions and finish with a trailing comma, so
1042 adding a ; after them would be wrong. */
1045 SvFLAGS(sv) &=~ (SVf_OK|SVf_IVisUV|SVf_UTF8);
1048 SvPADSTALE_on(sv); /* mark as no longer live */
1050 else { /* Someone has a claim on this, so abandon it. */
1051 assert( SvFLAGS(sv) & SVs_PADMY);
1052 assert(!(SvFLAGS(sv) & SVs_PADTMP));
1053 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
1054 case SVt_PVAV: *svp = MUTABLE_SV(newAV()); break;
1055 case SVt_PVHV: *svp = MUTABLE_SV(newHV()); break;
1059 *svp = newSV_type(SVt_PVCV);
1062 assert(CvNAMED(sv));
1063 CvNAME_HEK_set(*svp,
1064 share_hek_hek(CvNAME_HEK((CV *)sv)));
1067 default: *svp = newSV(0); break;
1069 SvREFCNT_dec_NN(sv); /* Cast current value to the winds. */
1070 /* preserve pad nature, but also mark as not live
1071 * for any closure capturing */
1072 SvFLAGS(*svp) |= (SVs_PADMY|SVs_PADSTALE);
1078 (void)hv_delete(ARG0_HV, ARG2_PV, ARG1_I32, G_DISCARD);
1079 SvREFCNT_dec(ARG0_HV);
1080 Safefree(arg2.any_ptr);
1083 (void)av_delete(ARG0_AV, arg1.any_iv, G_DISCARD);
1084 SvREFCNT_dec(ARG0_AV);
1086 case SAVEt_DESTRUCTOR_X:
1087 (*arg1.any_dxptr)(aTHX_ ARG0_PTR);
1089 case SAVEt_REGCONTEXT:
1090 /* regexp must have croaked */
1092 PL_savestack_ix -= uv >> SAVE_TIGHT_SHIFT;
1094 case SAVEt_STACK_POS: /* Position on Perl stack */
1095 PL_stack_sp = PL_stack_base + arg0.any_i32;
1097 case SAVEt_AELEM: /* array element */
1098 svp = av_fetch(ARG2_AV, arg1.any_iv, 1);
1099 if (UNLIKELY(!AvREAL(ARG2_AV) && AvREIFY(ARG2_AV))) /* undo reify guard */
1100 SvREFCNT_dec(ARG0_SV);
1102 SV * const sv = *svp;
1103 if (LIKELY(sv && sv != &PL_sv_undef)) {
1104 if (UNLIKELY(SvTIED_mg((const SV *)ARG2_AV, PERL_MAGIC_tied)))
1105 SvREFCNT_inc_void_NN(sv);
1110 SvREFCNT_dec(ARG2_AV);
1111 SvREFCNT_dec(ARG0_SV);
1113 case SAVEt_HELEM: /* hash element */
1115 HE * const he = hv_fetch_ent(ARG2_HV, ARG1_SV, 1, 0);
1116 SvREFCNT_dec(ARG1_SV);
1118 const SV * const oval = HeVAL(he);
1119 if (LIKELY(oval && oval != &PL_sv_undef)) {
1121 if (UNLIKELY(SvTIED_mg((const SV *)ARG2_HV, PERL_MAGIC_tied)))
1122 SvREFCNT_inc_void(*svp);
1123 refsv = ARG2_SV; /* what to refcnt_dec */
1127 SvREFCNT_dec(ARG2_HV);
1128 SvREFCNT_dec(ARG0_SV);
1132 PL_op = (OP*)ARG0_PTR;
1135 if ((PL_hints & HINT_LOCALIZE_HH)) {
1136 while (GvHV(PL_hintgv)) {
1137 HV *hv = GvHV(PL_hintgv);
1138 GvHV(PL_hintgv) = NULL;
1139 SvREFCNT_dec(MUTABLE_SV(hv));
1142 cophh_free(CopHINTHASH_get(&PL_compiling));
1143 CopHINTHASH_set(&PL_compiling, (COPHH*)ARG0_PTR);
1144 *(I32*)&PL_hints = ARG1_I32;
1145 if (PL_hints & HINT_LOCALIZE_HH) {
1146 SvREFCNT_dec(MUTABLE_SV(GvHV(PL_hintgv)));
1147 GvHV(PL_hintgv) = MUTABLE_HV(SSPOPPTR);
1149 if (!GvHV(PL_hintgv)) {
1150 /* Need to add a new one manually, else rv2hv can
1151 add one via GvHVn and it won't have the magic set. */
1152 HV *const hv = newHV();
1153 hv_magic(hv, NULL, PERL_MAGIC_hints);
1154 GvHV(PL_hintgv) = hv;
1156 assert(GvHV(PL_hintgv));
1159 PL_comppad = (PAD*)ARG0_PTR;
1160 if (LIKELY(PL_comppad))
1161 PL_curpad = AvARRAY(PL_comppad);
1165 case SAVEt_PADSV_AND_MORTALIZE:
1169 svp = AvARRAY((PAD*)ARG1_PTR) + (PADOFFSET)arg0.any_uv;
1170 /* This mortalizing used to be done by POPLOOP() via itersave.
1171 But as we have all the information here, we can do it here,
1172 save even having to have itersave in the struct. */
1177 case SAVEt_SAVESWITCHSTACK:
1180 SWITCHSTACK(ARG0_AV, ARG1_AV);
1181 PL_curstackinfo->si_stack = ARG1_AV;
1184 case SAVEt_SET_SVFLAGS:
1185 SvFLAGS(ARG2_SV) &= ~((U32)ARG1_I32);
1186 SvFLAGS(ARG2_SV) |= (U32)ARG0_I32;
1189 /* These are only saved in mathoms.c */
1191 (void)sv_clear(ARG0_SV);
1193 case SAVEt_LONG: /* long reference */
1194 *(long*)ARG0_PTR = arg1.any_long;
1196 case SAVEt_IV: /* IV reference */
1197 *(IV*)ARG0_PTR = arg1.any_iv;
1200 case SAVEt_I16: /* I16 reference */
1201 *(I16*)ARG0_PTR = (I16)(uv >> 8);
1203 case SAVEt_I8: /* I8 reference */
1204 *(I8*)ARG0_PTR = (I8)(uv >> 8);
1206 case SAVEt_DESTRUCTOR:
1207 (*arg1.any_dptr)(ARG0_PTR);
1209 case SAVEt_COMPILE_WARNINGS:
1210 if (!specialWARN(PL_compiling.cop_warnings))
1211 PerlMemShared_free(PL_compiling.cop_warnings);
1213 PL_compiling.cop_warnings = (STRLEN*)ARG0_PTR;
1216 parser_free((yy_parser *) ARG0_PTR);
1218 case SAVEt_READONLY_OFF:
1219 SvREADONLY_off(ARG0_SV);
1222 Perl_croak(aTHX_ "panic: leave_scope inconsistency %u", type);
1230 Perl_cx_dump(pTHX_ PERL_CONTEXT *cx)
1232 PERL_ARGS_ASSERT_CX_DUMP;
1235 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]);
1236 if (CxTYPE(cx) != CXt_SUBST) {
1237 const char *gimme_text;
1238 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
1239 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%"UVxf"\n",
1240 PTR2UV(cx->blk_oldcop));
1241 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
1242 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
1243 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%"UVxf"\n",
1244 PTR2UV(cx->blk_oldpm));
1245 switch (cx->blk_gimme) {
1247 gimme_text = "VOID";
1250 gimme_text = "SCALAR";
1253 gimme_text = "LIST";
1256 gimme_text = "UNKNOWN";
1259 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", gimme_text);
1261 switch (CxTYPE(cx)) {
1266 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.CV = 0x%"UVxf"\n",
1267 PTR2UV(cx->blk_format.cv));
1268 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.GV = 0x%"UVxf"\n",
1269 PTR2UV(cx->blk_format.gv));
1270 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.DFOUTGV = 0x%"UVxf"\n",
1271 PTR2UV(cx->blk_format.dfoutgv));
1272 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.HASARGS = %d\n",
1273 (int)CxHASARGS(cx));
1274 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.RETOP = 0x%"UVxf"\n",
1275 PTR2UV(cx->blk_format.retop));
1278 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%"UVxf"\n",
1279 PTR2UV(cx->blk_sub.cv));
1280 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
1281 (long)cx->blk_sub.olddepth);
1282 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
1283 (int)CxHASARGS(cx));
1284 PerlIO_printf(Perl_debug_log, "BLK_SUB.LVAL = %d\n", (int)CxLVAL(cx));
1285 PerlIO_printf(Perl_debug_log, "BLK_SUB.RETOP = 0x%"UVxf"\n",
1286 PTR2UV(cx->blk_sub.retop));
1289 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
1290 (long)CxOLD_IN_EVAL(cx));
1291 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
1292 PL_op_name[CxOLD_OP_TYPE(cx)],
1293 PL_op_desc[CxOLD_OP_TYPE(cx)]);
1294 if (cx->blk_eval.old_namesv)
1295 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
1296 SvPVX_const(cx->blk_eval.old_namesv));
1297 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%"UVxf"\n",
1298 PTR2UV(cx->blk_eval.old_eval_root));
1299 PerlIO_printf(Perl_debug_log, "BLK_EVAL.RETOP = 0x%"UVxf"\n",
1300 PTR2UV(cx->blk_eval.retop));
1303 case CXt_LOOP_LAZYIV:
1304 case CXt_LOOP_LAZYSV:
1306 case CXt_LOOP_PLAIN:
1307 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n", CxLABEL(cx));
1308 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
1309 (long)cx->blk_loop.resetsp);
1310 PerlIO_printf(Perl_debug_log, "BLK_LOOP.MY_OP = 0x%"UVxf"\n",
1311 PTR2UV(cx->blk_loop.my_op));
1312 /* XXX: not accurate for LAZYSV/IV */
1313 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%"UVxf"\n",
1314 PTR2UV(cx->blk_loop.state_u.ary.ary));
1315 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
1316 (long)cx->blk_loop.state_u.ary.ix);
1317 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%"UVxf"\n",
1318 PTR2UV(CxITERVAR(cx)));
1322 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
1323 (long)cx->sb_iters);
1324 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
1325 (long)cx->sb_maxiters);
1326 PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n",
1327 (long)cx->sb_rflags);
1328 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
1330 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
1332 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%"UVxf"\n",
1333 PTR2UV(cx->sb_dstr));
1334 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%"UVxf"\n",
1335 PTR2UV(cx->sb_targ));
1336 PerlIO_printf(Perl_debug_log, "SB_S = 0x%"UVxf"\n",
1338 PerlIO_printf(Perl_debug_log, "SB_M = 0x%"UVxf"\n",
1340 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%"UVxf"\n",
1341 PTR2UV(cx->sb_strend));
1342 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%"UVxf"\n",
1343 PTR2UV(cx->sb_rxres));
1347 PERL_UNUSED_CONTEXT;
1348 PERL_UNUSED_ARG(cx);
1349 #endif /* DEBUGGING */
1354 * c-indentation-style: bsd
1356 * indent-tabs-mode: nil
1359 * ex: set ts=8 sts=4 sw=4 et: