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;
36 "panic: stack_grow() negative count (%"IVdf")", (IV)n);
39 #ifndef STRESS_REALLOC
40 av_extend(PL_curstack, (p - PL_stack_base) + (n) + 128);
42 av_extend(PL_curstack, (p - PL_stack_base) + (n) + 1);
47 #ifndef STRESS_REALLOC
48 #define GROW(old) ((old) * 3 / 2)
50 #define GROW(old) ((old) + 1)
54 Perl_new_stackinfo(pTHX_ I32 stitems, I32 cxitems)
58 si->si_stack = newAV();
59 AvREAL_off(si->si_stack);
60 av_extend(si->si_stack, stitems > 0 ? stitems-1 : 0);
61 AvALLOC(si->si_stack)[0] = &PL_sv_undef;
62 AvFILLp(si->si_stack) = 0;
65 si->si_cxmax = cxitems - 1;
67 si->si_type = PERLSI_UNDEF;
68 Newx(si->si_cxstack, cxitems, PERL_CONTEXT);
69 /* Without any kind of initialising PUSHSUBST()
70 * in pp_subst() will read uninitialised heap. */
71 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;
90 if (UNLIKELY(PL_scopestack_ix == PL_scopestack_max)) {
91 PL_scopestack_max = GROW(PL_scopestack_max);
92 Renew(PL_scopestack, PL_scopestack_max, I32);
94 Renew(PL_scopestack_name, PL_scopestack_max, const char*);
98 PL_scopestack_name[PL_scopestack_ix] = "unknown";
100 PL_scopestack[PL_scopestack_ix++] = PL_savestack_ix;
107 const I32 oldsave = PL_scopestack[--PL_scopestack_ix];
108 LEAVE_SCOPE(oldsave);
112 Perl_markstack_grow(pTHX)
114 const I32 oldmax = PL_markstack_max - PL_markstack;
115 const I32 newmax = GROW(oldmax);
117 Renew(PL_markstack, newmax, I32);
118 PL_markstack_max = PL_markstack + newmax;
119 PL_markstack_ptr = PL_markstack + oldmax;
120 return PL_markstack_ptr;
124 Perl_savestack_grow(pTHX)
126 PL_savestack_max = GROW(PL_savestack_max) + 4;
127 Renew(PL_savestack, PL_savestack_max, ANY);
131 Perl_savestack_grow_cnt(pTHX_ I32 need)
133 PL_savestack_max = PL_savestack_ix + need;
134 Renew(PL_savestack, PL_savestack_max, ANY);
139 /* The original function was called Perl_tmps_grow and was removed from public
140 API, Perl_tmps_grow_p is the replacement and it used in public macros but
143 Perl_tmps_grow_p takes a proposed ix. A proposed ix is PL_tmps_ix + extend_by,
144 where the result of (PL_tmps_ix + extend_by) is >= PL_tmps_max
145 Upon return, PL_tmps_stack[ix] will be a valid address. For machine code
146 optimization and register usage reasons, the proposed ix passed into
147 tmps_grow is returned to the caller which the caller can then use to write
148 an SV * to PL_tmps_stack[ix]. If the caller was using tmps_grow in
149 pre-extend mode (EXTEND_MORTAL macro), then it ignores the return value of
150 tmps_grow. Note, tmps_grow DOES NOT write ix to PL_tmps_ix, the caller
151 must assign ix or ret val of tmps_grow to PL_temps_ix themselves if that is
152 appropriate. The assignment to PL_temps_ix can happen before or after
153 tmps_grow call since tmps_grow doesn't look at PL_tmps_ix.
157 Perl_tmps_grow_p(pTHX_ SSize_t ix)
159 SSize_t extend_to = ix;
160 #ifndef STRESS_REALLOC
161 if (ix - PL_tmps_max < 128)
162 extend_to += (PL_tmps_max < 512) ? 128 : 512;
164 PL_tmps_max = extend_to + 1;
165 Renew(PL_tmps_stack, PL_tmps_max, SV*);
173 /* XXX should tmps_floor live in cxstack? */
174 const SSize_t myfloor = PL_tmps_floor;
175 while (PL_tmps_ix > myfloor) { /* clean up after last statement */
176 SV* const sv = PL_tmps_stack[PL_tmps_ix--];
178 PoisonWith(PL_tmps_stack + PL_tmps_ix + 1, 1, SV *, 0xAB);
180 if (LIKELY(sv && sv != &PL_sv_undef)) {
182 SvREFCNT_dec_NN(sv); /* note, can modify tmps_ix!!! */
188 S_save_scalar_at(pTHX_ SV **sptr, const U32 flags)
193 PERL_ARGS_ASSERT_SAVE_SCALAR_AT;
196 sv = (flags & SAVEf_KEEPOLDELEM) ? osv : (*sptr = newSV(0));
198 if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv)) {
199 if (SvGMAGICAL(osv)) {
200 SvFLAGS(osv) |= (SvFLAGS(osv) &
201 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
203 if (!(flags & SAVEf_KEEPOLDELEM))
204 mg_localize(osv, sv, cBOOL(flags & SAVEf_SETMAGIC));
211 Perl_save_pushptrptr(pTHX_ void *const ptr1, void *const ptr2, const int type)
221 Perl_save_scalar(pTHX_ GV *gv)
223 SV ** const sptr = &GvSVn(gv);
225 PERL_ARGS_ASSERT_SAVE_SCALAR;
227 if (UNLIKELY(SvGMAGICAL(*sptr))) {
232 save_pushptrptr(SvREFCNT_inc_simple(gv), SvREFCNT_inc(*sptr), SAVEt_SV);
233 return save_scalar_at(sptr, SAVEf_SETMAGIC); /* XXX - FIXME - see #60360 */
236 /* Like save_sptr(), but also SvREFCNT_dec()s the new value. Can be used to
237 * restore a global SV to its prior contents, freeing new value. */
239 Perl_save_generic_svref(pTHX_ SV **sptr)
241 PERL_ARGS_ASSERT_SAVE_GENERIC_SVREF;
243 save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_GENERIC_SVREF);
246 /* Like save_pptr(), but also Safefree()s the new value if it is different
247 * from the old one. Can be used to restore a global char* to its prior
248 * contents, freeing new value. */
250 Perl_save_generic_pvref(pTHX_ char **str)
252 PERL_ARGS_ASSERT_SAVE_GENERIC_PVREF;
254 save_pushptrptr(*str, str, SAVEt_GENERIC_PVREF);
257 /* Like save_generic_pvref(), but uses PerlMemShared_free() rather than Safefree().
258 * Can be used to restore a shared global char* to its prior
259 * contents, freeing new value. */
261 Perl_save_shared_pvref(pTHX_ char **str)
263 PERL_ARGS_ASSERT_SAVE_SHARED_PVREF;
265 save_pushptrptr(str, *str, SAVEt_SHARED_PVREF);
268 /* set the SvFLAGS specified by mask to the values in val */
271 Perl_save_set_svflags(pTHX_ SV* sv, U32 mask, U32 val)
275 PERL_ARGS_ASSERT_SAVE_SET_SVFLAGS;
280 SS_ADD_UV(SAVEt_SET_SVFLAGS);
285 Perl_save_gp(pTHX_ GV *gv, I32 empty)
287 PERL_ARGS_ASSERT_SAVE_GP;
289 save_pushptrptr(SvREFCNT_inc(gv), GvGP(gv), SAVEt_GP);
292 GP *gp = Perl_newGP(aTHX_ gv);
293 HV * const stash = GvSTASH(gv);
294 bool isa_changed = 0;
296 if (stash && HvENAME(stash)) {
297 if (GvNAMELEN(gv) == 3 && strnEQ(GvNAME(gv), "ISA", 3))
300 /* taking a method out of circulation ("local")*/
301 mro_method_changed_in(stash);
303 if (GvIOp(gv) && (IoFLAGS(GvIOp(gv)) & IOf_ARGV)) {
305 IoFLAGS(gp->gp_io) |= IOf_ARGV|IOf_START;
308 if (isa_changed) mro_isa_changed_in(stash);
317 Perl_save_ary(pTHX_ GV *gv)
319 AV * const oav = GvAVn(gv);
322 PERL_ARGS_ASSERT_SAVE_ARY;
324 if (UNLIKELY(!AvREAL(oav) && AvREIFY(oav)))
326 save_pushptrptr(SvREFCNT_inc_simple_NN(gv), oav, SAVEt_AV);
330 if (UNLIKELY(SvMAGIC(oav)))
331 mg_localize(MUTABLE_SV(oav), MUTABLE_SV(av), TRUE);
336 Perl_save_hash(pTHX_ GV *gv)
340 PERL_ARGS_ASSERT_SAVE_HASH;
343 SvREFCNT_inc_simple_NN(gv), (ohv = GvHVn(gv)), SAVEt_HV
348 if (UNLIKELY(SvMAGIC(ohv)))
349 mg_localize(MUTABLE_SV(ohv), MUTABLE_SV(hv), TRUE);
354 Perl_save_item(pTHX_ SV *item)
356 SV * const sv = newSVsv(item);
358 PERL_ARGS_ASSERT_SAVE_ITEM;
360 save_pushptrptr(item, /* remember the pointer */
361 sv, /* remember the value */
366 Perl_save_bool(pTHX_ bool *boolp)
370 PERL_ARGS_ASSERT_SAVE_BOOL;
373 SS_ADD_UV(SAVEt_BOOL | (*boolp << 8));
378 Perl_save_pushi32ptr(pTHX_ const I32 i, void *const ptr, const int type)
389 Perl_save_int(pTHX_ int *intp)
392 UV type = ((UV)((UV)i << SAVE_TIGHT_SHIFT) | SAVEt_INT_SMALL);
396 PERL_ARGS_ASSERT_SAVE_INT;
398 if (UNLIKELY((int)(type >> SAVE_TIGHT_SHIFT) != i)) {
409 Perl_save_I8(pTHX_ I8 *bytep)
413 PERL_ARGS_ASSERT_SAVE_I8;
416 SS_ADD_UV(SAVEt_I8 | ((UV)*bytep << 8));
421 Perl_save_I16(pTHX_ I16 *intp)
425 PERL_ARGS_ASSERT_SAVE_I16;
428 SS_ADD_UV(SAVEt_I16 | ((UV)*intp << 8));
433 Perl_save_I32(pTHX_ I32 *intp)
436 UV type = ((I32)((U32)i << SAVE_TIGHT_SHIFT) | SAVEt_I32_SMALL);
440 PERL_ARGS_ASSERT_SAVE_I32;
442 if (UNLIKELY((I32)(type >> SAVE_TIGHT_SHIFT) != i)) {
453 Perl_save_strlen(pTHX_ STRLEN *ptr)
457 PERL_ARGS_ASSERT_SAVE_STRLEN;
461 SS_ADD_UV(SAVEt_STRLEN);
465 /* Cannot use save_sptr() to store a char* since the SV** cast will
466 * force word-alignment and we'll miss the pointer.
469 Perl_save_pptr(pTHX_ char **pptr)
471 PERL_ARGS_ASSERT_SAVE_PPTR;
473 save_pushptrptr(*pptr, pptr, SAVEt_PPTR);
477 Perl_save_vptr(pTHX_ void *ptr)
479 PERL_ARGS_ASSERT_SAVE_VPTR;
481 save_pushptrptr(*(char**)ptr, ptr, SAVEt_VPTR);
485 Perl_save_sptr(pTHX_ SV **sptr)
487 PERL_ARGS_ASSERT_SAVE_SPTR;
489 save_pushptrptr(*sptr, sptr, SAVEt_SPTR);
493 Perl_save_padsv_and_mortalize(pTHX_ PADOFFSET off)
497 ASSERT_CURPAD_ACTIVE("save_padsv");
498 SS_ADD_PTR(SvREFCNT_inc_simple_NN(PL_curpad[off]));
499 SS_ADD_PTR(PL_comppad);
501 SS_ADD_UV(SAVEt_PADSV_AND_MORTALIZE);
506 Perl_save_hptr(pTHX_ HV **hptr)
508 PERL_ARGS_ASSERT_SAVE_HPTR;
510 save_pushptrptr(*hptr, hptr, SAVEt_HPTR);
514 Perl_save_aptr(pTHX_ AV **aptr)
516 PERL_ARGS_ASSERT_SAVE_APTR;
518 save_pushptrptr(*aptr, aptr, SAVEt_APTR);
522 Perl_save_pushptr(pTHX_ void *const ptr, const int type)
531 Perl_save_clearsv(pTHX_ SV **svp)
533 const UV offset = svp - PL_curpad;
534 const UV offset_shifted = offset << SAVE_TIGHT_SHIFT;
536 PERL_ARGS_ASSERT_SAVE_CLEARSV;
538 ASSERT_CURPAD_ACTIVE("save_clearsv");
539 SvPADSTALE_off(*svp); /* mark lexical as active */
540 if (UNLIKELY((offset_shifted >> SAVE_TIGHT_SHIFT) != offset)) {
541 Perl_croak(aTHX_ "panic: pad offset %"UVuf" out of range (%p-%p)",
542 offset, svp, PL_curpad);
547 SS_ADD_UV(offset_shifted | SAVEt_CLEARSV);
553 Perl_save_delete(pTHX_ HV *hv, char *key, I32 klen)
555 PERL_ARGS_ASSERT_SAVE_DELETE;
557 save_pushptri32ptr(key, klen, SvREFCNT_inc_simple(hv), SAVEt_DELETE);
561 Perl_save_hdelete(pTHX_ HV *hv, SV *keysv)
567 PERL_ARGS_ASSERT_SAVE_HDELETE;
569 key = SvPV_const(keysv, len);
570 klen = SvUTF8(keysv) ? -(I32)len : (I32)len;
571 SvREFCNT_inc_simple_void_NN(hv);
572 save_pushptri32ptr(savepvn(key, len), klen, hv, SAVEt_DELETE);
576 Perl_save_adelete(pTHX_ AV *av, SSize_t key)
580 PERL_ARGS_ASSERT_SAVE_ADELETE;
582 SvREFCNT_inc_void(av);
585 SS_ADD_IV(SAVEt_ADELETE);
590 Perl_save_destructor(pTHX_ DESTRUCTORFUNC_NOCONTEXT_t f, void* p)
593 PERL_ARGS_ASSERT_SAVE_DESTRUCTOR;
597 SS_ADD_UV(SAVEt_DESTRUCTOR);
602 Perl_save_destructor_x(pTHX_ DESTRUCTORFUNC_t f, void* p)
608 SS_ADD_UV(SAVEt_DESTRUCTOR_X);
613 Perl_save_hints(pTHX)
615 COPHH *save_cophh = cophh_copy(CopHINTHASH_get(&PL_compiling));
616 if (PL_hints & HINT_LOCALIZE_HH) {
617 HV *oldhh = GvHV(PL_hintgv);
618 save_pushptri32ptr(oldhh, PL_hints, save_cophh, SAVEt_HINTS);
619 GvHV(PL_hintgv) = NULL; /* in case copying dies */
620 GvHV(PL_hintgv) = hv_copy_hints_hv(oldhh);
622 save_pushi32ptr(PL_hints, save_cophh, SAVEt_HINTS);
627 S_save_pushptri32ptr(pTHX_ void *const ptr1, const I32 i, void *const ptr2,
639 Perl_save_aelem_flags(pTHX_ AV *av, SSize_t idx, SV **sptr,
645 PERL_ARGS_ASSERT_SAVE_AELEM_FLAGS;
648 SS_ADD_PTR(SvREFCNT_inc_simple(av));
650 SS_ADD_PTR(SvREFCNT_inc(*sptr));
651 SS_ADD_UV(SAVEt_AELEM);
653 /* The array needs to hold a reference count on its new element, so it
655 if (UNLIKELY(!AvREAL(av) && AvREIFY(av)))
657 save_scalar_at(sptr, flags); /* XXX - FIXME - see #60360 */
658 if (flags & SAVEf_KEEPOLDELEM)
661 /* If we're localizing a tied array element, this new sv
662 * won't actually be stored in the array - so it won't get
663 * reaped when the localize ends. Ensure it gets reaped by
664 * mortifying it instead. DAPM */
665 if (UNLIKELY(SvTIED_mg((const SV *)av, PERL_MAGIC_tied)))
670 Perl_save_helem_flags(pTHX_ HV *hv, SV *key, SV **sptr, const U32 flags)
674 PERL_ARGS_ASSERT_SAVE_HELEM_FLAGS;
679 SS_ADD_PTR(SvREFCNT_inc_simple(hv));
680 SS_ADD_PTR(newSVsv(key));
681 SS_ADD_PTR(SvREFCNT_inc(*sptr));
682 SS_ADD_UV(SAVEt_HELEM);
685 save_scalar_at(sptr, flags);
686 if (flags & SAVEf_KEEPOLDELEM)
689 /* If we're localizing a tied hash element, this new sv
690 * won't actually be stored in the hash - so it won't get
691 * reaped when the localize ends. Ensure it gets reaped by
692 * mortifying it instead. DAPM */
693 if (UNLIKELY(SvTIED_mg((const SV *)hv, PERL_MAGIC_tied)))
698 Perl_save_svref(pTHX_ SV **sptr)
700 PERL_ARGS_ASSERT_SAVE_SVREF;
703 save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_SVREF);
704 return save_scalar_at(sptr, SAVEf_SETMAGIC); /* XXX - FIXME - see #60360 */
708 Perl_save_alloc(pTHX_ I32 size, I32 pad)
710 const I32 start = pad + ((char*)&PL_savestack[PL_savestack_ix]
711 - (char*)PL_savestack);
712 const UV elems = 1 + ((size + pad - 1) / sizeof(*PL_savestack));
713 const UV elems_shifted = elems << SAVE_TIGHT_SHIFT;
715 if (UNLIKELY((elems_shifted >> SAVE_TIGHT_SHIFT) != elems))
717 "panic: save_alloc elems %"UVuf" out of range (%"IVdf"-%"IVdf")",
718 elems, (IV)size, (IV)pad);
722 PL_savestack_ix += elems;
723 SSPUSHUV(SAVEt_ALLOC | elems_shifted);
729 #define ARG0_SV MUTABLE_SV(arg0.any_ptr)
730 #define ARG0_AV MUTABLE_AV(arg0.any_ptr)
731 #define ARG0_HV MUTABLE_HV(arg0.any_ptr)
732 #define ARG0_PTR arg0.any_ptr
733 #define ARG0_PV (char*)(arg0.any_ptr)
734 #define ARG0_PVP (char**)(arg0.any_ptr)
735 #define ARG0_I32 (arg0.any_i32)
737 #define ARG1_SV MUTABLE_SV(arg1.any_ptr)
738 #define ARG1_AV MUTABLE_AV(arg1.any_ptr)
739 #define ARG1_GV MUTABLE_GV(arg1.any_ptr)
740 #define ARG1_SVP (SV**)(arg1.any_ptr)
741 #define ARG1_PVP (char**)(arg1.any_ptr)
742 #define ARG1_PTR arg1.any_ptr
743 #define ARG1_PV (char*)(arg1.any_ptr)
744 #define ARG1_I32 (arg1.any_i32)
746 #define ARG2_SV MUTABLE_SV(arg2.any_ptr)
747 #define ARG2_AV MUTABLE_AV(arg2.any_ptr)
748 #define ARG2_HV MUTABLE_HV(arg2.any_ptr)
749 #define ARG2_GV MUTABLE_GV(arg2.any_ptr)
750 #define ARG2_PV (char*)(arg2.any_ptr)
753 Perl_leave_scope(pTHX_ I32 base)
755 /* Localise the effects of the TAINT_NOT inside the loop. */
756 bool was = TAINT_get;
761 ANY arg0, arg1, arg2;
763 /* these initialisations are logically unnecessary, but they shut up
764 * spurious 'may be used uninitialized' compiler warnings */
769 if (UNLIKELY(base < -1))
770 Perl_croak(aTHX_ "panic: corrupt saved stack index %ld", (long) base);
771 DEBUG_l(Perl_deb(aTHX_ "savestack: releasing items %ld -> %ld\n",
772 (long)PL_savestack_ix, (long)base));
773 while (PL_savestack_ix > base) {
783 I32 ix = PL_savestack_ix - 1;
784 ANY *p = &PL_savestack[ix];
786 type = (U8)uv & SAVE_MASK;
787 if (type > SAVEt_ARG0_MAX) {
790 if (type > SAVEt_ARG1_MAX) {
792 if (type > SAVEt_ARG2_MAX) {
798 PL_savestack_ix = ix;
802 case SAVEt_ITEM: /* normal string */
803 sv_replace(ARG1_SV, ARG0_SV);
804 if (UNLIKELY(SvSMAGICAL(ARG1_SV))) {
811 /* This would be a mathom, but Perl_save_svref() calls a static
812 function, S_save_scalar_at(), so has to stay in this file. */
813 case SAVEt_SVREF: /* scalar reference */
815 refsv = NULL; /* what to refcnt_dec */
818 case SAVEt_SV: /* scalar reference */
819 svp = &GvSV(ARG1_GV);
820 refsv = ARG1_SV; /* what to refcnt_dec */
823 SV * const sv = *svp;
826 if (UNLIKELY(SvSMAGICAL(ARG0_SV))) {
831 SvREFCNT_dec_NN(ARG0_SV);
835 case SAVEt_GENERIC_PVREF: /* generic pv */
836 if (*ARG0_PVP != ARG1_PV) {
841 case SAVEt_SHARED_PVREF: /* shared pv */
842 if (*ARG1_PVP != ARG0_PV) {
844 PerlMem_free(*ARG1_PVP);
846 PerlMemShared_free(*ARG1_PVP);
851 case SAVEt_GVSV: /* scalar slot in GV */
852 svp = &GvSV(ARG1_GV);
854 case SAVEt_GENERIC_SVREF: /* generic sv */
858 SV * const sv = *svp;
861 SvREFCNT_dec(ARG0_SV);
864 case SAVEt_GVSLOT: /* any slot in GV */
866 HV *const hv = GvSTASH(ARG2_GV);
868 if (hv && HvENAME(hv) && (
869 (ARG0_SV && SvTYPE(ARG0_SV) == SVt_PVCV)
870 || (*svp && SvTYPE(*svp) == SVt_PVCV)
873 if ((char *)svp < (char *)GvGP(ARG2_GV)
874 || (char *)svp > (char *)GvGP(ARG2_GV) + sizeof(struct gp)
875 || GvREFCNT(ARG2_GV) > 2) /* "> 2" to ignore savestack's ref */
877 else mro_method_changed_in(hv);
881 case SAVEt_AV: /* array reference */
882 SvREFCNT_dec(GvAV(ARG1_GV));
883 GvAV(ARG1_GV) = ARG0_AV;
884 if (UNLIKELY(SvSMAGICAL(ARG0_SV))) {
889 SvREFCNT_dec_NN(ARG1_GV);
891 case SAVEt_HV: /* hash reference */
892 SvREFCNT_dec(GvHV(ARG1_GV));
893 GvHV(ARG1_GV) = ARG0_HV;
894 if (UNLIKELY(SvSMAGICAL(ARG0_SV))) {
899 SvREFCNT_dec_NN(ARG1_GV);
901 case SAVEt_INT_SMALL:
902 *(int*)ARG0_PTR = (int)(uv >> SAVE_TIGHT_SHIFT);
904 case SAVEt_INT: /* int reference */
905 *(int*)ARG0_PTR = (int)ARG1_I32;
907 case SAVEt_STRLEN: /* STRLEN/size_t ref */
908 *(STRLEN*)ARG0_PTR = (STRLEN)arg1.any_iv;
910 case SAVEt_BOOL: /* bool reference */
911 *(bool*)ARG0_PTR = cBOOL(uv >> 8);
912 #ifdef NO_TAINT_SUPPORT
913 PERL_UNUSED_VAR(was);
915 if (UNLIKELY(ARG0_PTR == &(TAINT_get))) {
916 /* If we don't update <was>, to reflect what was saved on the
917 * stack for PL_tainted, then we will overwrite this attempt to
918 * restore it when we exit this routine. Note that this won't
919 * work if this value was saved in a wider-than necessary type,
921 was = *(bool*)ARG0_PTR;
925 case SAVEt_I32_SMALL:
926 *(I32*)ARG0_PTR = (I32)(uv >> SAVE_TIGHT_SHIFT);
928 case SAVEt_I32: /* I32 reference */
929 #ifdef PERL_DEBUG_READONLY_OPS
930 if (*(I32*)ARG0_PTR != ARG1_I32)
932 *(I32*)ARG0_PTR = ARG1_I32;
934 case SAVEt_SPTR: /* SV* reference */
935 *(SV**)(ARG0_PTR)= ARG1_SV;
937 case SAVEt_VPTR: /* random* reference */
938 case SAVEt_PPTR: /* char* reference */
941 case SAVEt_HPTR: /* HV* reference */
942 *(HV**)ARG0_PTR = MUTABLE_HV(ARG1_PTR);
944 case SAVEt_APTR: /* AV* reference */
945 *(AV**)ARG0_PTR = ARG1_AV;
947 case SAVEt_GP: /* scalar reference */
950 /* possibly taking a method out of circulation */
951 const bool had_method = !!GvCVu(ARG1_GV);
953 GvGP_set(ARG1_GV, (GP*)ARG0_PTR);
954 if ((hv=GvSTASH(ARG1_GV)) && HvENAME_get(hv)) {
955 if ( GvNAMELEN(ARG1_GV) == 3
956 && strnEQ(GvNAME(ARG1_GV), "ISA", 3)
958 mro_isa_changed_in(hv);
959 else if (had_method || GvCVu(ARG1_GV))
960 /* putting a method back into circulation ("local")*/
961 gv_method_changed(ARG1_GV);
963 SvREFCNT_dec_NN(ARG1_GV);
967 SvREFCNT_dec(ARG0_SV);
969 case SAVEt_FREEPADNAME:
970 PadnameREFCNT_dec((PADNAME *)ARG0_PTR);
972 case SAVEt_FREECOPHH:
973 cophh_free((COPHH *)ARG0_PTR);
975 case SAVEt_MORTALIZESV:
979 ASSERT_CURPAD_LEGAL("SAVEt_FREEOP");
980 op_free((OP*)ARG0_PTR);
986 case SAVEt_CLEARPADRANGE:
987 i = (I32)((uv >> SAVE_TIGHT_SHIFT) & OPpPADRANGE_COUNTMASK);
988 svp = &PL_curpad[uv >>
989 (OPpPADRANGE_COUNTSHIFT + SAVE_TIGHT_SHIFT)] + i - 1;
992 svp = &PL_curpad[uv >> SAVE_TIGHT_SHIFT];
995 for (; i; i--, svp--) {
998 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
999 "Pad 0x%"UVxf"[0x%"UVxf"] clearsv: %ld sv=0x%"UVxf"<%"IVdf"> %s\n",
1000 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
1001 (long)(svp-PL_curpad), PTR2UV(sv), (IV)SvREFCNT(sv),
1002 (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) ? "clear" : "abandon"
1005 /* Can clear pad variable in place? */
1006 if (SvREFCNT(sv) == 1 && !SvOBJECT(sv)) {
1008 /* these flags are the union of all the relevant flags
1009 * in the individual conditions within */
1010 if (UNLIKELY(SvFLAGS(sv) & (
1011 SVf_READONLY|SVf_PROTECT /*for SvREADONLY_off*/
1012 | (SVs_GMG|SVs_SMG|SVs_RMG) /* SvMAGICAL() */
1016 /* if a my variable that was made readonly is
1017 * going out of scope, we want to remove the
1018 * readonlyness so that it can go out of scope
1024 if (SvOOK(sv)) { /* OOK or HvAUX */
1025 if (SvTYPE(sv) == SVt_PVHV)
1026 Perl_hv_kill_backrefs(aTHX_ MUTABLE_HV(sv));
1031 if (SvMAGICAL(sv)) {
1032 /* note that backrefs (either in HvAUX or magic)
1033 * must be removed before other magic */
1034 sv_unmagic(sv, PERL_MAGIC_backref);
1035 if (SvTYPE(sv) != SVt_PVCV)
1038 if (SvTHINKFIRST(sv))
1039 sv_force_normal_flags(sv, SV_IMMEDIATE_UNREF
1043 switch (SvTYPE(sv)) {
1047 av_clear(MUTABLE_AV(sv));
1050 hv_clear(MUTABLE_HV(sv));
1056 ? CvNAME_HEK((CV *)sv)
1057 : GvNAME_HEK(CvGV(sv));
1059 (void)share_hek_hek(hek);
1061 CvNAME_HEK_set(sv, hek);
1066 /* This looks odd, but these two macros are for use in
1067 expressions and finish with a trailing comma, so
1068 adding a ; after them would be wrong. */
1071 SvFLAGS(sv) &=~ (SVf_OK|SVf_IVisUV|SVf_UTF8);
1075 SvPADSTALE_on(sv); /* mark as no longer live */
1077 else { /* Someone has a claim on this, so abandon it. */
1078 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
1079 case SVt_PVAV: *svp = MUTABLE_SV(newAV()); break;
1080 case SVt_PVHV: *svp = MUTABLE_SV(newHV()); break;
1083 HEK * const hek = CvNAMED(sv)
1084 ? CvNAME_HEK((CV *)sv)
1085 : GvNAME_HEK(CvGV(sv));
1088 *svp = newSV_type(SVt_PVCV);
1091 CvNAME_HEK_set(*svp,
1092 share_hek_hek(hek));
1096 default: *svp = newSV(0); break;
1098 SvREFCNT_dec_NN(sv); /* Cast current value to the winds. */
1099 /* preserve pad nature, but also mark as not live
1100 * for any closure capturing */
1101 SvFLAGS(*svp) |= SVs_PADSTALE;
1106 (void)hv_delete(ARG0_HV, ARG2_PV, ARG1_I32, G_DISCARD);
1107 SvREFCNT_dec(ARG0_HV);
1108 Safefree(arg2.any_ptr);
1111 (void)av_delete(ARG0_AV, arg1.any_iv, G_DISCARD);
1112 SvREFCNT_dec(ARG0_AV);
1114 case SAVEt_DESTRUCTOR_X:
1115 (*arg1.any_dxptr)(aTHX_ ARG0_PTR);
1117 case SAVEt_REGCONTEXT:
1118 /* regexp must have croaked */
1120 PL_savestack_ix -= uv >> SAVE_TIGHT_SHIFT;
1122 case SAVEt_STACK_POS: /* Position on Perl stack */
1123 PL_stack_sp = PL_stack_base + arg0.any_i32;
1125 case SAVEt_AELEM: /* array element */
1126 svp = av_fetch(ARG2_AV, arg1.any_iv, 1);
1127 if (UNLIKELY(!AvREAL(ARG2_AV) && AvREIFY(ARG2_AV))) /* undo reify guard */
1128 SvREFCNT_dec(ARG0_SV);
1130 SV * const sv = *svp;
1131 if (LIKELY(sv && sv != &PL_sv_undef)) {
1132 if (UNLIKELY(SvTIED_mg((const SV *)ARG2_AV, PERL_MAGIC_tied)))
1133 SvREFCNT_inc_void_NN(sv);
1138 SvREFCNT_dec(ARG2_AV);
1139 SvREFCNT_dec(ARG0_SV);
1141 case SAVEt_HELEM: /* hash element */
1143 HE * const he = hv_fetch_ent(ARG2_HV, ARG1_SV, 1, 0);
1144 SvREFCNT_dec(ARG1_SV);
1146 const SV * const oval = HeVAL(he);
1147 if (LIKELY(oval && oval != &PL_sv_undef)) {
1149 if (UNLIKELY(SvTIED_mg((const SV *)ARG2_HV, PERL_MAGIC_tied)))
1150 SvREFCNT_inc_void(*svp);
1151 refsv = ARG2_SV; /* what to refcnt_dec */
1155 SvREFCNT_dec(ARG2_HV);
1156 SvREFCNT_dec(ARG0_SV);
1160 PL_op = (OP*)ARG0_PTR;
1163 if ((PL_hints & HINT_LOCALIZE_HH)) {
1164 while (GvHV(PL_hintgv)) {
1165 HV *hv = GvHV(PL_hintgv);
1166 GvHV(PL_hintgv) = NULL;
1167 SvREFCNT_dec(MUTABLE_SV(hv));
1170 cophh_free(CopHINTHASH_get(&PL_compiling));
1171 CopHINTHASH_set(&PL_compiling, (COPHH*)ARG0_PTR);
1172 *(I32*)&PL_hints = ARG1_I32;
1173 if (PL_hints & HINT_LOCALIZE_HH) {
1174 SvREFCNT_dec(MUTABLE_SV(GvHV(PL_hintgv)));
1175 GvHV(PL_hintgv) = MUTABLE_HV(SSPOPPTR);
1177 if (!GvHV(PL_hintgv)) {
1178 /* Need to add a new one manually, else rv2hv can
1179 add one via GvHVn and it won't have the magic set. */
1180 HV *const hv = newHV();
1181 hv_magic(hv, NULL, PERL_MAGIC_hints);
1182 GvHV(PL_hintgv) = hv;
1184 assert(GvHV(PL_hintgv));
1187 PL_comppad = (PAD*)ARG0_PTR;
1188 if (LIKELY(PL_comppad))
1189 PL_curpad = AvARRAY(PL_comppad);
1193 case SAVEt_PADSV_AND_MORTALIZE:
1197 svp = AvARRAY((PAD*)ARG1_PTR) + (PADOFFSET)arg0.any_uv;
1198 /* This mortalizing used to be done by POPLOOP() via itersave.
1199 But as we have all the information here, we can do it here,
1200 save even having to have itersave in the struct. */
1205 case SAVEt_SAVESWITCHSTACK:
1208 SWITCHSTACK(ARG0_AV, ARG1_AV);
1209 PL_curstackinfo->si_stack = ARG1_AV;
1212 case SAVEt_SET_SVFLAGS:
1213 SvFLAGS(ARG2_SV) &= ~((U32)ARG1_I32);
1214 SvFLAGS(ARG2_SV) |= (U32)ARG0_I32;
1217 /* These are only saved in mathoms.c */
1219 (void)sv_clear(ARG0_SV);
1221 case SAVEt_LONG: /* long reference */
1222 *(long*)ARG0_PTR = arg1.any_long;
1224 case SAVEt_IV: /* IV reference */
1225 *(IV*)ARG0_PTR = arg1.any_iv;
1228 case SAVEt_I16: /* I16 reference */
1229 *(I16*)ARG0_PTR = (I16)(uv >> 8);
1231 case SAVEt_I8: /* I8 reference */
1232 *(I8*)ARG0_PTR = (I8)(uv >> 8);
1234 case SAVEt_DESTRUCTOR:
1235 (*arg1.any_dptr)(ARG0_PTR);
1237 case SAVEt_COMPILE_WARNINGS:
1238 if (!specialWARN(PL_compiling.cop_warnings))
1239 PerlMemShared_free(PL_compiling.cop_warnings);
1241 PL_compiling.cop_warnings = (STRLEN*)ARG0_PTR;
1244 parser_free((yy_parser *) ARG0_PTR);
1246 case SAVEt_READONLY_OFF:
1247 SvREADONLY_off(ARG0_SV);
1250 Perl_croak(aTHX_ "panic: leave_scope inconsistency %u", type);
1258 Perl_cx_dump(pTHX_ PERL_CONTEXT *cx)
1260 PERL_ARGS_ASSERT_CX_DUMP;
1263 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]);
1264 if (CxTYPE(cx) != CXt_SUBST) {
1265 const char *gimme_text;
1266 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
1267 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%"UVxf"\n",
1268 PTR2UV(cx->blk_oldcop));
1269 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
1270 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
1271 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%"UVxf"\n",
1272 PTR2UV(cx->blk_oldpm));
1273 switch (cx->blk_gimme) {
1275 gimme_text = "VOID";
1278 gimme_text = "SCALAR";
1281 gimme_text = "LIST";
1284 gimme_text = "UNKNOWN";
1287 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", gimme_text);
1289 switch (CxTYPE(cx)) {
1294 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.CV = 0x%"UVxf"\n",
1295 PTR2UV(cx->blk_format.cv));
1296 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.GV = 0x%"UVxf"\n",
1297 PTR2UV(cx->blk_format.gv));
1298 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.DFOUTGV = 0x%"UVxf"\n",
1299 PTR2UV(cx->blk_format.dfoutgv));
1300 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.HASARGS = %d\n",
1301 (int)CxHASARGS(cx));
1302 PerlIO_printf(Perl_debug_log, "BLK_FORMAT.RETOP = 0x%"UVxf"\n",
1303 PTR2UV(cx->blk_format.retop));
1306 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%"UVxf"\n",
1307 PTR2UV(cx->blk_sub.cv));
1308 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
1309 (long)cx->blk_sub.olddepth);
1310 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
1311 (int)CxHASARGS(cx));
1312 PerlIO_printf(Perl_debug_log, "BLK_SUB.LVAL = %d\n", (int)CxLVAL(cx));
1313 PerlIO_printf(Perl_debug_log, "BLK_SUB.RETOP = 0x%"UVxf"\n",
1314 PTR2UV(cx->blk_sub.retop));
1317 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
1318 (long)CxOLD_IN_EVAL(cx));
1319 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
1320 PL_op_name[CxOLD_OP_TYPE(cx)],
1321 PL_op_desc[CxOLD_OP_TYPE(cx)]);
1322 if (cx->blk_eval.old_namesv)
1323 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
1324 SvPVX_const(cx->blk_eval.old_namesv));
1325 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%"UVxf"\n",
1326 PTR2UV(cx->blk_eval.old_eval_root));
1327 PerlIO_printf(Perl_debug_log, "BLK_EVAL.RETOP = 0x%"UVxf"\n",
1328 PTR2UV(cx->blk_eval.retop));
1331 case CXt_LOOP_LAZYIV:
1332 case CXt_LOOP_LAZYSV:
1334 case CXt_LOOP_PLAIN:
1335 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n", CxLABEL(cx));
1336 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
1337 (long)cx->blk_loop.resetsp);
1338 PerlIO_printf(Perl_debug_log, "BLK_LOOP.MY_OP = 0x%"UVxf"\n",
1339 PTR2UV(cx->blk_loop.my_op));
1340 /* XXX: not accurate for LAZYSV/IV */
1341 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%"UVxf"\n",
1342 PTR2UV(cx->blk_loop.state_u.ary.ary));
1343 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
1344 (long)cx->blk_loop.state_u.ary.ix);
1345 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%"UVxf"\n",
1346 PTR2UV(CxITERVAR(cx)));
1350 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
1351 (long)cx->sb_iters);
1352 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
1353 (long)cx->sb_maxiters);
1354 PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n",
1355 (long)cx->sb_rflags);
1356 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
1358 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
1360 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%"UVxf"\n",
1361 PTR2UV(cx->sb_dstr));
1362 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%"UVxf"\n",
1363 PTR2UV(cx->sb_targ));
1364 PerlIO_printf(Perl_debug_log, "SB_S = 0x%"UVxf"\n",
1366 PerlIO_printf(Perl_debug_log, "SB_M = 0x%"UVxf"\n",
1368 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%"UVxf"\n",
1369 PTR2UV(cx->sb_strend));
1370 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%"UVxf"\n",
1371 PTR2UV(cx->sb_rxres));
1375 PERL_UNUSED_CONTEXT;
1376 PERL_UNUSED_ARG(cx);
1377 #endif /* DEBUGGING */
1381 * ex: set ts=8 sts=4 sw=4 et: