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);
135 /* The original function was called Perl_tmps_grow and was removed from public
136 API, Perl_tmps_grow_p is the replacement and it used in public macros but
139 Perl_tmps_grow_p takes a proposed ix. A proposed ix is PL_tmps_ix + extend_by,
140 where the result of (PL_tmps_ix + extend_by) is >= PL_tmps_max
141 Upon return, PL_tmps_stack[ix] will be a valid address. For machine code
142 optimization and register usage reasons, the proposed ix passed into
143 tmps_grow is returned to the caller which the caller can then use to write
144 an SV * to PL_tmps_stack[ix]. If the caller was using tmps_grow in
145 pre-extend mode (EXTEND_MORTAL macro), then it ignores the return value of
146 tmps_grow. Note, tmps_grow DOES NOT write ix to PL_tmps_ix, the caller
147 must assign ix or ret val of tmps_grow to PL_temps_ix themselves if that is
148 appropriate. The assignment to PL_temps_ix can happen before or after
149 tmps_grow call since tmps_grow doesn't look at PL_tmps_ix.
153 Perl_tmps_grow_p(pTHX_ SSize_t ix)
155 SSize_t extend_to = ix;
156 #ifndef STRESS_REALLOC
157 if (ix - PL_tmps_max < 128)
158 extend_to += (PL_tmps_max < 512) ? 128 : 512;
160 PL_tmps_max = extend_to + 1;
161 Renew(PL_tmps_stack, PL_tmps_max, SV*);
169 /* XXX should tmps_floor live in cxstack? */
170 const SSize_t myfloor = PL_tmps_floor;
171 while (PL_tmps_ix > myfloor) { /* clean up after last statement */
172 SV* const sv = PL_tmps_stack[PL_tmps_ix--];
174 PoisonWith(PL_tmps_stack + PL_tmps_ix + 1, 1, SV *, 0xAB);
176 if (LIKELY(sv && sv != &PL_sv_undef)) {
178 SvREFCNT_dec_NN(sv); /* note, can modify tmps_ix!!! */
184 S_save_scalar_at(pTHX_ SV **sptr, const U32 flags)
189 PERL_ARGS_ASSERT_SAVE_SCALAR_AT;
192 sv = (flags & SAVEf_KEEPOLDELEM) ? osv : (*sptr = newSV(0));
194 if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv)) {
195 if (SvGMAGICAL(osv)) {
196 SvFLAGS(osv) |= (SvFLAGS(osv) &
197 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
199 if (!(flags & SAVEf_KEEPOLDELEM))
200 mg_localize(osv, sv, cBOOL(flags & SAVEf_SETMAGIC));
207 Perl_save_pushptrptr(pTHX_ void *const ptr1, void *const ptr2, const int type)
217 Perl_save_scalar(pTHX_ GV *gv)
219 SV ** const sptr = &GvSVn(gv);
221 PERL_ARGS_ASSERT_SAVE_SCALAR;
223 if (UNLIKELY(SvGMAGICAL(*sptr))) {
228 save_pushptrptr(SvREFCNT_inc_simple(gv), SvREFCNT_inc(*sptr), SAVEt_SV);
229 return save_scalar_at(sptr, SAVEf_SETMAGIC); /* XXX - FIXME - see #60360 */
232 /* Like save_sptr(), but also SvREFCNT_dec()s the new value. Can be used to
233 * restore a global SV to its prior contents, freeing new value. */
235 Perl_save_generic_svref(pTHX_ SV **sptr)
237 PERL_ARGS_ASSERT_SAVE_GENERIC_SVREF;
239 save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_GENERIC_SVREF);
242 /* Like save_pptr(), but also Safefree()s the new value if it is different
243 * from the old one. Can be used to restore a global char* to its prior
244 * contents, freeing new value. */
246 Perl_save_generic_pvref(pTHX_ char **str)
248 PERL_ARGS_ASSERT_SAVE_GENERIC_PVREF;
250 save_pushptrptr(*str, str, SAVEt_GENERIC_PVREF);
253 /* Like save_generic_pvref(), but uses PerlMemShared_free() rather than Safefree().
254 * Can be used to restore a shared global char* to its prior
255 * contents, freeing new value. */
257 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)
271 PERL_ARGS_ASSERT_SAVE_SET_SVFLAGS;
276 SS_ADD_UV(SAVEt_SET_SVFLAGS);
281 Perl_save_gp(pTHX_ GV *gv, I32 empty)
283 PERL_ARGS_ASSERT_SAVE_GP;
285 save_pushptrptr(SvREFCNT_inc(gv), GvGP(gv), SAVEt_GP);
288 GP *gp = Perl_newGP(aTHX_ gv);
289 HV * const stash = GvSTASH(gv);
290 bool isa_changed = 0;
292 if (stash && HvENAME(stash)) {
293 if (GvNAMELEN(gv) == 3 && strnEQ(GvNAME(gv), "ISA", 3))
296 /* taking a method out of circulation ("local")*/
297 mro_method_changed_in(stash);
299 if (GvIOp(gv) && (IoFLAGS(GvIOp(gv)) & IOf_ARGV)) {
301 IoFLAGS(gp->gp_io) |= IOf_ARGV|IOf_START;
304 if (isa_changed) mro_isa_changed_in(stash);
313 Perl_save_ary(pTHX_ GV *gv)
315 AV * const oav = GvAVn(gv);
318 PERL_ARGS_ASSERT_SAVE_ARY;
320 if (UNLIKELY(!AvREAL(oav) && AvREIFY(oav)))
322 save_pushptrptr(SvREFCNT_inc_simple_NN(gv), oav, SAVEt_AV);
326 if (UNLIKELY(SvMAGIC(oav)))
327 mg_localize(MUTABLE_SV(oav), MUTABLE_SV(av), TRUE);
332 Perl_save_hash(pTHX_ GV *gv)
336 PERL_ARGS_ASSERT_SAVE_HASH;
339 SvREFCNT_inc_simple_NN(gv), (ohv = GvHVn(gv)), SAVEt_HV
344 if (UNLIKELY(SvMAGIC(ohv)))
345 mg_localize(MUTABLE_SV(ohv), MUTABLE_SV(hv), TRUE);
350 Perl_save_item(pTHX_ SV *item)
352 SV * const sv = newSVsv(item);
354 PERL_ARGS_ASSERT_SAVE_ITEM;
356 save_pushptrptr(item, /* remember the pointer */
357 sv, /* remember the value */
362 Perl_save_bool(pTHX_ bool *boolp)
366 PERL_ARGS_ASSERT_SAVE_BOOL;
369 SS_ADD_UV(SAVEt_BOOL | (*boolp << 8));
374 Perl_save_pushi32ptr(pTHX_ const I32 i, void *const ptr, const int type)
385 Perl_save_int(pTHX_ int *intp)
388 UV type = ((UV)((UV)i << SAVE_TIGHT_SHIFT) | SAVEt_INT_SMALL);
392 PERL_ARGS_ASSERT_SAVE_INT;
394 if (UNLIKELY((int)(type >> SAVE_TIGHT_SHIFT) != i)) {
405 Perl_save_I8(pTHX_ I8 *bytep)
409 PERL_ARGS_ASSERT_SAVE_I8;
412 SS_ADD_UV(SAVEt_I8 | ((UV)*bytep << 8));
417 Perl_save_I16(pTHX_ I16 *intp)
421 PERL_ARGS_ASSERT_SAVE_I16;
424 SS_ADD_UV(SAVEt_I16 | ((UV)*intp << 8));
429 Perl_save_I32(pTHX_ I32 *intp)
432 UV type = ((I32)((U32)i << SAVE_TIGHT_SHIFT) | SAVEt_I32_SMALL);
436 PERL_ARGS_ASSERT_SAVE_I32;
438 if (UNLIKELY((I32)(type >> SAVE_TIGHT_SHIFT) != i)) {
449 Perl_save_strlen(pTHX_ STRLEN *ptr)
453 PERL_ARGS_ASSERT_SAVE_STRLEN;
457 SS_ADD_UV(SAVEt_STRLEN);
461 /* Cannot use save_sptr() to store a char* since the SV** cast will
462 * force word-alignment and we'll miss the pointer.
465 Perl_save_pptr(pTHX_ char **pptr)
467 PERL_ARGS_ASSERT_SAVE_PPTR;
469 save_pushptrptr(*pptr, pptr, SAVEt_PPTR);
473 Perl_save_vptr(pTHX_ void *ptr)
475 PERL_ARGS_ASSERT_SAVE_VPTR;
477 save_pushptrptr(*(char**)ptr, ptr, SAVEt_VPTR);
481 Perl_save_sptr(pTHX_ SV **sptr)
483 PERL_ARGS_ASSERT_SAVE_SPTR;
485 save_pushptrptr(*sptr, sptr, SAVEt_SPTR);
489 Perl_save_padsv_and_mortalize(pTHX_ PADOFFSET off)
493 ASSERT_CURPAD_ACTIVE("save_padsv");
494 SS_ADD_PTR(SvREFCNT_inc_simple_NN(PL_curpad[off]));
495 SS_ADD_PTR(PL_comppad);
497 SS_ADD_UV(SAVEt_PADSV_AND_MORTALIZE);
502 Perl_save_hptr(pTHX_ HV **hptr)
504 PERL_ARGS_ASSERT_SAVE_HPTR;
506 save_pushptrptr(*hptr, hptr, SAVEt_HPTR);
510 Perl_save_aptr(pTHX_ AV **aptr)
512 PERL_ARGS_ASSERT_SAVE_APTR;
514 save_pushptrptr(*aptr, aptr, SAVEt_APTR);
518 Perl_save_pushptr(pTHX_ void *const ptr, const int type)
527 Perl_save_clearsv(pTHX_ SV **svp)
529 const UV offset = svp - PL_curpad;
530 const UV offset_shifted = offset << SAVE_TIGHT_SHIFT;
532 PERL_ARGS_ASSERT_SAVE_CLEARSV;
534 ASSERT_CURPAD_ACTIVE("save_clearsv");
535 SvPADSTALE_off(*svp); /* mark lexical as active */
536 if (UNLIKELY((offset_shifted >> SAVE_TIGHT_SHIFT) != offset)) {
537 Perl_croak(aTHX_ "panic: pad offset %"UVuf" out of range (%p-%p)",
538 offset, svp, PL_curpad);
543 SS_ADD_UV(offset_shifted | SAVEt_CLEARSV);
549 Perl_save_delete(pTHX_ HV *hv, char *key, I32 klen)
551 PERL_ARGS_ASSERT_SAVE_DELETE;
553 save_pushptri32ptr(key, klen, SvREFCNT_inc_simple(hv), SAVEt_DELETE);
557 Perl_save_hdelete(pTHX_ HV *hv, SV *keysv)
563 PERL_ARGS_ASSERT_SAVE_HDELETE;
565 key = SvPV_const(keysv, len);
566 klen = SvUTF8(keysv) ? -(I32)len : (I32)len;
567 SvREFCNT_inc_simple_void_NN(hv);
568 save_pushptri32ptr(savepvn(key, len), klen, hv, SAVEt_DELETE);
572 Perl_save_adelete(pTHX_ AV *av, SSize_t key)
576 PERL_ARGS_ASSERT_SAVE_ADELETE;
578 SvREFCNT_inc_void(av);
581 SS_ADD_IV(SAVEt_ADELETE);
586 Perl_save_destructor(pTHX_ DESTRUCTORFUNC_NOCONTEXT_t f, void* p)
589 PERL_ARGS_ASSERT_SAVE_DESTRUCTOR;
593 SS_ADD_UV(SAVEt_DESTRUCTOR);
598 Perl_save_destructor_x(pTHX_ DESTRUCTORFUNC_t f, void* p)
604 SS_ADD_UV(SAVEt_DESTRUCTOR_X);
609 Perl_save_hints(pTHX)
611 COPHH *save_cophh = cophh_copy(CopHINTHASH_get(&PL_compiling));
612 if (PL_hints & HINT_LOCALIZE_HH) {
613 HV *oldhh = GvHV(PL_hintgv);
614 save_pushptri32ptr(oldhh, PL_hints, save_cophh, SAVEt_HINTS);
615 GvHV(PL_hintgv) = NULL; /* in case copying dies */
616 GvHV(PL_hintgv) = hv_copy_hints_hv(oldhh);
618 save_pushi32ptr(PL_hints, save_cophh, SAVEt_HINTS);
623 S_save_pushptri32ptr(pTHX_ void *const ptr1, const I32 i, void *const ptr2,
635 Perl_save_aelem_flags(pTHX_ AV *av, SSize_t idx, SV **sptr,
641 PERL_ARGS_ASSERT_SAVE_AELEM_FLAGS;
644 SS_ADD_PTR(SvREFCNT_inc_simple(av));
646 SS_ADD_PTR(SvREFCNT_inc(*sptr));
647 SS_ADD_UV(SAVEt_AELEM);
649 /* The array needs to hold a reference count on its new element, so it
651 if (UNLIKELY(!AvREAL(av) && AvREIFY(av)))
653 save_scalar_at(sptr, flags); /* XXX - FIXME - see #60360 */
654 if (flags & SAVEf_KEEPOLDELEM)
657 /* If we're localizing a tied array element, this new sv
658 * won't actually be stored in the array - so it won't get
659 * reaped when the localize ends. Ensure it gets reaped by
660 * mortifying it instead. DAPM */
661 if (UNLIKELY(SvTIED_mg((const SV *)av, PERL_MAGIC_tied)))
666 Perl_save_helem_flags(pTHX_ HV *hv, SV *key, SV **sptr, const U32 flags)
670 PERL_ARGS_ASSERT_SAVE_HELEM_FLAGS;
675 SS_ADD_PTR(SvREFCNT_inc_simple(hv));
676 SS_ADD_PTR(newSVsv(key));
677 SS_ADD_PTR(SvREFCNT_inc(*sptr));
678 SS_ADD_UV(SAVEt_HELEM);
681 save_scalar_at(sptr, flags);
682 if (flags & SAVEf_KEEPOLDELEM)
685 /* If we're localizing a tied hash element, this new sv
686 * won't actually be stored in the hash - so it won't get
687 * reaped when the localize ends. Ensure it gets reaped by
688 * mortifying it instead. DAPM */
689 if (UNLIKELY(SvTIED_mg((const SV *)hv, PERL_MAGIC_tied)))
694 Perl_save_svref(pTHX_ SV **sptr)
696 PERL_ARGS_ASSERT_SAVE_SVREF;
699 save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_SVREF);
700 return save_scalar_at(sptr, SAVEf_SETMAGIC); /* XXX - FIXME - see #60360 */
704 Perl_save_alloc(pTHX_ I32 size, I32 pad)
706 const I32 start = pad + ((char*)&PL_savestack[PL_savestack_ix]
707 - (char*)PL_savestack);
708 const UV elems = 1 + ((size + pad - 1) / sizeof(*PL_savestack));
709 const UV elems_shifted = elems << SAVE_TIGHT_SHIFT;
711 if (UNLIKELY((elems_shifted >> SAVE_TIGHT_SHIFT) != elems))
713 "panic: save_alloc elems %"UVuf" out of range (%"IVdf"-%"IVdf")",
714 elems, (IV)size, (IV)pad);
718 PL_savestack_ix += elems;
719 SSPUSHUV(SAVEt_ALLOC | elems_shifted);
724 Perl_save_aliased_sv(pTHX_ GV *gv)
727 PERL_ARGS_ASSERT_SAVE_ALIASED_SV;
728 SS_ADD_PTR(gp_ref(GvGP(gv)));
729 SS_ADD_UV(SAVEt_GP_ALIASED_SV | cBOOL(GvALIASED_SV(gv)) << 8);
735 #define ARG0_SV MUTABLE_SV(arg0.any_ptr)
736 #define ARG0_AV MUTABLE_AV(arg0.any_ptr)
737 #define ARG0_HV MUTABLE_HV(arg0.any_ptr)
738 #define ARG0_PTR arg0.any_ptr
739 #define ARG0_PV (char*)(arg0.any_ptr)
740 #define ARG0_PVP (char**)(arg0.any_ptr)
741 #define ARG0_I32 (arg0.any_i32)
743 #define ARG1_SV MUTABLE_SV(arg1.any_ptr)
744 #define ARG1_AV MUTABLE_AV(arg1.any_ptr)
745 #define ARG1_GV MUTABLE_GV(arg1.any_ptr)
746 #define ARG1_SVP (SV**)(arg1.any_ptr)
747 #define ARG1_PVP (char**)(arg1.any_ptr)
748 #define ARG1_PTR arg1.any_ptr
749 #define ARG1_PV (char*)(arg1.any_ptr)
750 #define ARG1_I32 (arg1.any_i32)
752 #define ARG2_SV MUTABLE_SV(arg2.any_ptr)
753 #define ARG2_AV MUTABLE_AV(arg2.any_ptr)
754 #define ARG2_HV MUTABLE_HV(arg2.any_ptr)
755 #define ARG2_GV MUTABLE_GV(arg2.any_ptr)
756 #define ARG2_PV (char*)(arg2.any_ptr)
759 Perl_leave_scope(pTHX_ I32 base)
761 /* Localise the effects of the TAINT_NOT inside the loop. */
762 bool was = TAINT_get;
767 ANY arg0, arg1, arg2;
769 /* these initialisations are logically unnecessary, but they shut up
770 * spurious 'may be used uninitialized' compiler warnings */
775 if (UNLIKELY(base < -1))
776 Perl_croak(aTHX_ "panic: corrupt saved stack index %ld", (long) base);
777 DEBUG_l(Perl_deb(aTHX_ "savestack: releasing items %ld -> %ld\n",
778 (long)PL_savestack_ix, (long)base));
779 while (PL_savestack_ix > base) {
789 I32 ix = PL_savestack_ix - 1;
790 ANY *p = &PL_savestack[ix];
792 type = (U8)uv & SAVE_MASK;
793 if (type > SAVEt_ARG0_MAX) {
796 if (type > SAVEt_ARG1_MAX) {
798 if (type > SAVEt_ARG2_MAX) {
804 PL_savestack_ix = ix;
808 case SAVEt_ITEM: /* normal string */
809 sv_replace(ARG1_SV, ARG0_SV);
810 if (UNLIKELY(SvSMAGICAL(ARG1_SV))) {
817 /* This would be a mathom, but Perl_save_svref() calls a static
818 function, S_save_scalar_at(), so has to stay in this file. */
819 case SAVEt_SVREF: /* scalar reference */
821 refsv = NULL; /* what to refcnt_dec */
824 case SAVEt_SV: /* scalar reference */
825 svp = &GvSV(ARG1_GV);
826 refsv = ARG1_SV; /* what to refcnt_dec */
829 SV * const sv = *svp;
832 if (UNLIKELY(SvSMAGICAL(ARG0_SV))) {
837 SvREFCNT_dec_NN(ARG0_SV);
841 case SAVEt_GENERIC_PVREF: /* generic pv */
842 if (*ARG0_PVP != ARG1_PV) {
847 case SAVEt_SHARED_PVREF: /* shared pv */
848 if (*ARG1_PVP != ARG0_PV) {
850 PerlMem_free(*ARG1_PVP);
852 PerlMemShared_free(*ARG1_PVP);
857 case SAVEt_GVSV: /* scalar slot in GV */
858 svp = &GvSV(ARG1_GV);
860 case SAVEt_GENERIC_SVREF: /* generic sv */
864 SV * const sv = *svp;
867 SvREFCNT_dec(ARG0_SV);
870 case SAVEt_GVSLOT: /* any slot in GV */
872 HV *const hv = GvSTASH(ARG2_GV);
874 if (hv && HvENAME(hv) && (
875 (ARG0_SV && SvTYPE(ARG0_SV) == SVt_PVCV)
876 || (*svp && SvTYPE(*svp) == SVt_PVCV)
879 if ((char *)svp < (char *)GvGP(ARG2_GV)
880 || (char *)svp > (char *)GvGP(ARG2_GV) + sizeof(struct gp)
881 || GvREFCNT(ARG2_GV) > 2) /* "> 2" to ignore savestack's ref */
883 else mro_method_changed_in(hv);
887 case SAVEt_AV: /* array reference */
888 SvREFCNT_dec(GvAV(ARG1_GV));
889 GvAV(ARG1_GV) = ARG0_AV;
890 if (UNLIKELY(SvSMAGICAL(ARG0_SV))) {
895 SvREFCNT_dec_NN(ARG1_GV);
897 case SAVEt_HV: /* hash reference */
898 SvREFCNT_dec(GvHV(ARG1_GV));
899 GvHV(ARG1_GV) = ARG0_HV;
900 if (UNLIKELY(SvSMAGICAL(ARG0_SV))) {
905 SvREFCNT_dec_NN(ARG1_GV);
907 case SAVEt_INT_SMALL:
908 *(int*)ARG0_PTR = (int)(uv >> SAVE_TIGHT_SHIFT);
910 case SAVEt_INT: /* int reference */
911 *(int*)ARG0_PTR = (int)ARG1_I32;
913 case SAVEt_STRLEN: /* STRLEN/size_t ref */
914 *(STRLEN*)ARG0_PTR = (STRLEN)arg1.any_iv;
916 case SAVEt_BOOL: /* bool reference */
917 *(bool*)ARG0_PTR = cBOOL(uv >> 8);
918 #ifdef NO_TAINT_SUPPORT
919 PERL_UNUSED_VAR(was);
921 if (UNLIKELY(ARG0_PTR == &(TAINT_get))) {
922 /* If we don't update <was>, to reflect what was saved on the
923 * stack for PL_tainted, then we will overwrite this attempt to
924 * restore it when we exit this routine. Note that this won't
925 * work if this value was saved in a wider-than necessary type,
927 was = *(bool*)ARG0_PTR;
931 case SAVEt_I32_SMALL:
932 *(I32*)ARG0_PTR = (I32)(uv >> SAVE_TIGHT_SHIFT);
934 case SAVEt_I32: /* I32 reference */
935 #ifdef PERL_DEBUG_READONLY_OPS
936 if (*(I32*)ARG0_PTR != ARG1_I32)
938 *(I32*)ARG0_PTR = ARG1_I32;
940 case SAVEt_SPTR: /* SV* reference */
941 *(SV**)(ARG0_PTR)= ARG1_SV;
943 case SAVEt_VPTR: /* random* reference */
944 case SAVEt_PPTR: /* char* reference */
947 case SAVEt_HPTR: /* HV* reference */
948 *(HV**)ARG0_PTR = MUTABLE_HV(ARG1_PTR);
950 case SAVEt_APTR: /* AV* reference */
951 *(AV**)ARG0_PTR = ARG1_AV;
953 case SAVEt_GP: /* scalar reference */
956 /* possibly taking a method out of circulation */
957 const bool had_method = !!GvCVu(ARG1_GV);
959 GvGP_set(ARG1_GV, (GP*)ARG0_PTR);
960 if ((hv=GvSTASH(ARG1_GV)) && HvENAME_get(hv)) {
961 if ( GvNAMELEN(ARG1_GV) == 3
962 && strnEQ(GvNAME(ARG1_GV), "ISA", 3)
964 mro_isa_changed_in(hv);
965 else if (had_method || GvCVu(ARG1_GV))
966 /* putting a method back into circulation ("local")*/
967 gv_method_changed(ARG1_GV);
969 SvREFCNT_dec_NN(ARG1_GV);
973 SvREFCNT_dec(ARG0_SV);
975 case SAVEt_FREEPADNAME:
976 PadnameREFCNT_dec((PADNAME *)ARG0_PTR);
978 case SAVEt_FREECOPHH:
979 cophh_free((COPHH *)ARG0_PTR);
981 case SAVEt_MORTALIZESV:
985 ASSERT_CURPAD_LEGAL("SAVEt_FREEOP");
986 op_free((OP*)ARG0_PTR);
992 case SAVEt_CLEARPADRANGE:
993 i = (I32)((uv >> SAVE_TIGHT_SHIFT) & OPpPADRANGE_COUNTMASK);
994 svp = &PL_curpad[uv >>
995 (OPpPADRANGE_COUNTSHIFT + SAVE_TIGHT_SHIFT)] + i - 1;
998 svp = &PL_curpad[uv >> SAVE_TIGHT_SHIFT];
1001 for (; i; i--, svp--) {
1004 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1005 "Pad 0x%"UVxf"[0x%"UVxf"] clearsv: %ld sv=0x%"UVxf"<%"IVdf"> %s\n",
1006 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
1007 (long)(svp-PL_curpad), PTR2UV(sv), (IV)SvREFCNT(sv),
1008 (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) ? "clear" : "abandon"
1011 /* Can clear pad variable in place? */
1012 if (SvREFCNT(sv) == 1 && !SvOBJECT(sv)) {
1014 /* these flags are the union of all the relevant flags
1015 * in the individual conditions within */
1016 if (UNLIKELY(SvFLAGS(sv) & (
1017 SVf_READONLY|SVf_PROTECT /*for SvREADONLY_off*/
1018 | (SVs_GMG|SVs_SMG|SVs_RMG) /* SvMAGICAL() */
1022 /* if a my variable that was made readonly is
1023 * going out of scope, we want to remove the
1024 * readonlyness so that it can go out of scope
1030 if (SvOOK(sv)) { /* OOK or HvAUX */
1031 if (SvTYPE(sv) == SVt_PVHV)
1032 Perl_hv_kill_backrefs(aTHX_ MUTABLE_HV(sv));
1037 if (SvMAGICAL(sv)) {
1038 /* note that backrefs (either in HvAUX or magic)
1039 * must be removed before other magic */
1040 sv_unmagic(sv, PERL_MAGIC_backref);
1041 if (SvTYPE(sv) != SVt_PVCV)
1044 if (SvTHINKFIRST(sv))
1045 sv_force_normal_flags(sv, SV_IMMEDIATE_UNREF
1049 switch (SvTYPE(sv)) {
1053 av_clear(MUTABLE_AV(sv));
1056 hv_clear(MUTABLE_HV(sv));
1062 ? CvNAME_HEK((CV *)sv)
1063 : GvNAME_HEK(CvGV(sv));
1065 (void)share_hek_hek(hek);
1067 CvNAME_HEK_set(sv, hek);
1072 /* This looks odd, but these two macros are for use in
1073 expressions and finish with a trailing comma, so
1074 adding a ; after them would be wrong. */
1077 SvFLAGS(sv) &=~ (SVf_OK|SVf_IVisUV|SVf_UTF8);
1081 SvPADSTALE_on(sv); /* mark as no longer live */
1083 else { /* Someone has a claim on this, so abandon it. */
1084 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
1085 case SVt_PVAV: *svp = MUTABLE_SV(newAV()); break;
1086 case SVt_PVHV: *svp = MUTABLE_SV(newHV()); break;
1089 HEK * const hek = CvNAMED(sv)
1090 ? CvNAME_HEK((CV *)sv)
1091 : GvNAME_HEK(CvGV(sv));
1094 *svp = newSV_type(SVt_PVCV);
1097 CvNAME_HEK_set(*svp,
1098 share_hek_hek(hek));
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_PADSTALE;
1112 (void)hv_delete(ARG0_HV, ARG2_PV, ARG1_I32, G_DISCARD);
1113 SvREFCNT_dec(ARG0_HV);
1114 Safefree(arg2.any_ptr);
1117 (void)av_delete(ARG0_AV, arg1.any_iv, G_DISCARD);
1118 SvREFCNT_dec(ARG0_AV);
1120 case SAVEt_DESTRUCTOR_X:
1121 (*arg1.any_dxptr)(aTHX_ ARG0_PTR);
1123 case SAVEt_REGCONTEXT:
1124 /* regexp must have croaked */
1126 PL_savestack_ix -= uv >> SAVE_TIGHT_SHIFT;
1128 case SAVEt_STACK_POS: /* Position on Perl stack */
1129 PL_stack_sp = PL_stack_base + arg0.any_i32;
1131 case SAVEt_AELEM: /* array element */
1132 svp = av_fetch(ARG2_AV, arg1.any_iv, 1);
1133 if (UNLIKELY(!AvREAL(ARG2_AV) && AvREIFY(ARG2_AV))) /* undo reify guard */
1134 SvREFCNT_dec(ARG0_SV);
1136 SV * const sv = *svp;
1137 if (LIKELY(sv && sv != &PL_sv_undef)) {
1138 if (UNLIKELY(SvTIED_mg((const SV *)ARG2_AV, PERL_MAGIC_tied)))
1139 SvREFCNT_inc_void_NN(sv);
1144 SvREFCNT_dec(ARG2_AV);
1145 SvREFCNT_dec(ARG0_SV);
1147 case SAVEt_HELEM: /* hash element */
1149 HE * const he = hv_fetch_ent(ARG2_HV, ARG1_SV, 1, 0);
1150 SvREFCNT_dec(ARG1_SV);
1152 const SV * const oval = HeVAL(he);
1153 if (LIKELY(oval && oval != &PL_sv_undef)) {
1155 if (UNLIKELY(SvTIED_mg((const SV *)ARG2_HV, PERL_MAGIC_tied)))
1156 SvREFCNT_inc_void(*svp);
1157 refsv = ARG2_SV; /* what to refcnt_dec */
1161 SvREFCNT_dec(ARG2_HV);
1162 SvREFCNT_dec(ARG0_SV);
1166 PL_op = (OP*)ARG0_PTR;
1169 if ((PL_hints & HINT_LOCALIZE_HH)) {
1170 while (GvHV(PL_hintgv)) {
1171 HV *hv = GvHV(PL_hintgv);
1172 GvHV(PL_hintgv) = NULL;
1173 SvREFCNT_dec(MUTABLE_SV(hv));
1176 cophh_free(CopHINTHASH_get(&PL_compiling));
1177 CopHINTHASH_set(&PL_compiling, (COPHH*)ARG0_PTR);
1178 *(I32*)&PL_hints = ARG1_I32;
1179 if (PL_hints & HINT_LOCALIZE_HH) {
1180 SvREFCNT_dec(MUTABLE_SV(GvHV(PL_hintgv)));
1181 GvHV(PL_hintgv) = MUTABLE_HV(SSPOPPTR);
1183 if (!GvHV(PL_hintgv)) {
1184 /* Need to add a new one manually, else rv2hv can
1185 add one via GvHVn and it won't have the magic set. */
1186 HV *const hv = newHV();
1187 hv_magic(hv, NULL, PERL_MAGIC_hints);
1188 GvHV(PL_hintgv) = hv;
1190 assert(GvHV(PL_hintgv));
1193 PL_comppad = (PAD*)ARG0_PTR;
1194 if (LIKELY(PL_comppad))
1195 PL_curpad = AvARRAY(PL_comppad);
1199 case SAVEt_PADSV_AND_MORTALIZE:
1203 svp = AvARRAY((PAD*)ARG1_PTR) + (PADOFFSET)arg0.any_uv;
1204 /* This mortalizing used to be done by POPLOOP() via itersave.
1205 But as we have all the information here, we can do it here,
1206 save even having to have itersave in the struct. */
1211 case SAVEt_SAVESWITCHSTACK:
1214 SWITCHSTACK(ARG0_AV, ARG1_AV);
1215 PL_curstackinfo->si_stack = ARG1_AV;
1218 case SAVEt_SET_SVFLAGS:
1219 SvFLAGS(ARG2_SV) &= ~((U32)ARG1_I32);
1220 SvFLAGS(ARG2_SV) |= (U32)ARG0_I32;
1223 /* These are only saved in mathoms.c */
1225 (void)sv_clear(ARG0_SV);
1227 case SAVEt_LONG: /* long reference */
1228 *(long*)ARG0_PTR = arg1.any_long;
1230 case SAVEt_IV: /* IV reference */
1231 *(IV*)ARG0_PTR = arg1.any_iv;
1234 case SAVEt_I16: /* I16 reference */
1235 *(I16*)ARG0_PTR = (I16)(uv >> 8);
1237 case SAVEt_I8: /* I8 reference */
1238 *(I8*)ARG0_PTR = (I8)(uv >> 8);
1240 case SAVEt_DESTRUCTOR:
1241 (*arg1.any_dptr)(ARG0_PTR);
1243 case SAVEt_COMPILE_WARNINGS:
1244 if (!specialWARN(PL_compiling.cop_warnings))
1245 PerlMemShared_free(PL_compiling.cop_warnings);
1247 PL_compiling.cop_warnings = (STRLEN*)ARG0_PTR;
1250 parser_free((yy_parser *) ARG0_PTR);
1252 case SAVEt_READONLY_OFF:
1253 SvREADONLY_off(ARG0_SV);
1255 case SAVEt_GP_ALIASED_SV: {
1256 /* The GP may have been abandoned, leaving the savestack with
1257 the only remaining reference to it. */
1258 GP * const gp = (GP *)ARG0_PTR;
1259 if (gp->gp_refcnt == 1) {
1260 GV * const gv = (GV *)sv_2mortal(newSV_type(SVt_PVGV));
1261 isGV_with_GP_on(gv);
1264 isGV_with_GP_off(gv);
1268 if (uv >> 8) gp->gp_flags |= GPf_ALIASED_SV;
1269 else gp->gp_flags &= ~GPf_ALIASED_SV;
1274 Perl_croak(aTHX_ "panic: leave_scope inconsistency %u", type);
1282 Perl_cx_dump(pTHX_ PERL_CONTEXT *cx)
1284 PERL_ARGS_ASSERT_CX_DUMP;
1287 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]);
1288 if (CxTYPE(cx) != CXt_SUBST) {
1289 const char *gimme_text;
1290 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
1291 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%"UVxf"\n",
1292 PTR2UV(cx->blk_oldcop));
1293 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
1294 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
1295 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%"UVxf"\n",
1296 PTR2UV(cx->blk_oldpm));
1297 switch (cx->blk_gimme) {
1299 gimme_text = "VOID";
1302 gimme_text = "SCALAR";
1305 gimme_text = "LIST";
1308 gimme_text = "UNKNOWN";
1311 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", gimme_text);
1313 switch (CxTYPE(cx)) {
1318 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.CV = 0x%"UVxf"\n",
1319 PTR2UV(cx->blk_format.cv));
1320 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.GV = 0x%"UVxf"\n",
1321 PTR2UV(cx->blk_format.gv));
1322 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.DFOUTGV = 0x%"UVxf"\n",
1323 PTR2UV(cx->blk_format.dfoutgv));
1324 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.HASARGS = %d\n",
1325 (int)CxHASARGS(cx));
1326 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.RETOP = 0x%"UVxf"\n",
1327 PTR2UV(cx->blk_format.retop));
1330 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%"UVxf"\n",
1331 PTR2UV(cx->blk_sub.cv));
1332 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
1333 (long)cx->blk_sub.olddepth);
1334 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
1335 (int)CxHASARGS(cx));
1336 PerlIO_printf(Perl_debug_log, "BLK_SUB.LVAL = %d\n", (int)CxLVAL(cx));
1337 PerlIO_printf(Perl_debug_log, "BLK_SUB.RETOP = 0x%"UVxf"\n",
1338 PTR2UV(cx->blk_sub.retop));
1341 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
1342 (long)CxOLD_IN_EVAL(cx));
1343 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
1344 PL_op_name[CxOLD_OP_TYPE(cx)],
1345 PL_op_desc[CxOLD_OP_TYPE(cx)]);
1346 if (cx->blk_eval.old_namesv)
1347 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
1348 SvPVX_const(cx->blk_eval.old_namesv));
1349 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%"UVxf"\n",
1350 PTR2UV(cx->blk_eval.old_eval_root));
1351 PerlIO_printf(Perl_debug_log, "BLK_EVAL.RETOP = 0x%"UVxf"\n",
1352 PTR2UV(cx->blk_eval.retop));
1355 case CXt_LOOP_LAZYIV:
1356 case CXt_LOOP_LAZYSV:
1358 case CXt_LOOP_PLAIN:
1359 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n", CxLABEL(cx));
1360 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
1361 (long)cx->blk_loop.resetsp);
1362 PerlIO_printf(Perl_debug_log, "BLK_LOOP.MY_OP = 0x%"UVxf"\n",
1363 PTR2UV(cx->blk_loop.my_op));
1364 /* XXX: not accurate for LAZYSV/IV */
1365 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%"UVxf"\n",
1366 PTR2UV(cx->blk_loop.state_u.ary.ary));
1367 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
1368 (long)cx->blk_loop.state_u.ary.ix);
1369 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%"UVxf"\n",
1370 PTR2UV(CxITERVAR(cx)));
1374 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
1375 (long)cx->sb_iters);
1376 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
1377 (long)cx->sb_maxiters);
1378 PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n",
1379 (long)cx->sb_rflags);
1380 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
1382 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
1384 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%"UVxf"\n",
1385 PTR2UV(cx->sb_dstr));
1386 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%"UVxf"\n",
1387 PTR2UV(cx->sb_targ));
1388 PerlIO_printf(Perl_debug_log, "SB_S = 0x%"UVxf"\n",
1390 PerlIO_printf(Perl_debug_log, "SB_M = 0x%"UVxf"\n",
1392 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%"UVxf"\n",
1393 PTR2UV(cx->sb_strend));
1394 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%"UVxf"\n",
1395 PTR2UV(cx->sb_rxres));
1399 PERL_UNUSED_CONTEXT;
1400 PERL_UNUSED_ARG(cx);
1401 #endif /* DEBUGGING */
1406 * c-indentation-style: bsd
1408 * indent-tabs-mode: nil
1411 * ex: set ts=8 sts=4 sw=4 et: