3 * Copyright (c) 1991-1999, Larry Wall
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Artistic License, as specified in the README file.
11 * "For the fashion of Minas Tirith was such that it was built on seven
19 stack_grow(SV **sp, SV **p, int n)
22 #if defined(DEBUGGING) && !defined(USE_THREADS)
23 static int growing = 0;
28 #ifndef STRESS_REALLOC
29 av_extend(PL_curstack, (p - PL_stack_base) + (n) + 128);
31 av_extend(PL_curstack, (p - PL_stack_base) + (n) + 1);
33 #if defined(DEBUGGING) && !defined(USE_THREADS)
39 #ifndef STRESS_REALLOC
40 #define GROW(old) ((old) * 3 / 2)
42 #define GROW(old) ((old) + 1)
46 new_stackinfo(I32 stitems, I32 cxitems)
50 New(56, si, 1, PERL_SI);
51 si->si_stack = newAV();
52 AvREAL_off(si->si_stack);
53 av_extend(si->si_stack, stitems > 0 ? stitems-1 : 0);
54 AvALLOC(si->si_stack)[0] = &PL_sv_undef;
55 AvFILLp(si->si_stack) = 0;
58 si->si_cxmax = cxitems - 1;
60 si->si_type = PERLSI_UNDEF;
61 New(56, si->si_cxstack, cxitems, PERL_CONTEXT);
69 cxstack_max = GROW(cxstack_max);
70 Renew(cxstack, cxstack_max + 1, PERL_CONTEXT); /* XXX should fix CXINC macro */
71 return cxstack_ix + 1;
75 push_return(OP *retop)
78 if (PL_retstack_ix == PL_retstack_max) {
79 PL_retstack_max = GROW(PL_retstack_max);
80 Renew(PL_retstack, PL_retstack_max, OP*);
82 PL_retstack[PL_retstack_ix++] = retop;
89 if (PL_retstack_ix > 0)
90 return PL_retstack[--PL_retstack_ix];
99 if (PL_scopestack_ix == PL_scopestack_max) {
100 PL_scopestack_max = GROW(PL_scopestack_max);
101 Renew(PL_scopestack, PL_scopestack_max, I32);
103 PL_scopestack[PL_scopestack_ix++] = PL_savestack_ix;
111 I32 oldsave = PL_scopestack[--PL_scopestack_ix];
112 LEAVE_SCOPE(oldsave);
119 I32 oldmax = PL_markstack_max - PL_markstack;
120 I32 newmax = GROW(oldmax);
122 Renew(PL_markstack, newmax, I32);
123 PL_markstack_ptr = PL_markstack + oldmax;
124 PL_markstack_max = PL_markstack + newmax;
131 PL_savestack_max = GROW(PL_savestack_max) + 4;
132 Renew(PL_savestack, PL_savestack_max, ANY);
141 #ifndef STRESS_REALLOC
143 n = (PL_tmps_max < 512) ? 128 : 512;
145 PL_tmps_max = PL_tmps_ix + n + 1;
146 Renew(PL_tmps_stack, PL_tmps_max, SV*);
154 /* XXX should tmps_floor live in cxstack? */
155 I32 myfloor = PL_tmps_floor;
156 while (PL_tmps_ix > myfloor) { /* clean up after last statement */
157 SV* sv = PL_tmps_stack[PL_tmps_ix];
158 PL_tmps_stack[PL_tmps_ix--] = Nullsv;
161 SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */
167 save_scalar_at(SV **sptr)
173 sv = *sptr = NEWSV(0,0);
174 if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
175 sv_upgrade(sv, SvTYPE(osv));
176 if (SvGMAGICAL(osv)) {
178 bool oldtainted = PL_tainted;
180 if (PL_tainting && PL_tainted && (mg = mg_find(osv, 't'))) {
181 SAVESPTR(mg->mg_obj);
184 SvFLAGS(osv) |= (SvFLAGS(osv) &
185 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
186 PL_tainted = oldtainted;
188 SvMAGIC(sv) = SvMAGIC(osv);
189 SvFLAGS(sv) |= SvMAGICAL(osv);
201 SV **sptr = &GvSV(gv);
203 SSPUSHPTR(SvREFCNT_inc(gv));
204 SSPUSHPTR(SvREFCNT_inc(*sptr));
206 return save_scalar_at(sptr);
210 save_svref(SV **sptr)
215 SSPUSHPTR(SvREFCNT_inc(*sptr));
216 SSPUSHINT(SAVEt_SVREF);
217 return save_scalar_at(sptr);
220 /* Like save_svref(), but doesn't deal with magic. Can be used to
221 * restore a global SV to its prior contents, freeing new value. */
223 save_generic_svref(SV **sptr)
228 SSPUSHPTR(SvREFCNT_inc(*sptr));
229 SSPUSHINT(SAVEt_GENERIC_SVREF);
233 save_gp(GV *gv, I32 empty)
237 SSPUSHIV((IV)SvLEN(gv));
238 SvLEN(gv) = 0; /* forget that anything was allocated here */
239 SSPUSHIV((IV)SvCUR(gv));
240 SSPUSHPTR(SvPVX(gv));
242 SSPUSHPTR(SvREFCNT_inc(gv));
250 PL_sub_generation++; /* taking a method out of circulation */
251 Newz(602, gp, 1, GP);
252 GvGP(gv) = gp_ref(gp);
253 GvSV(gv) = NEWSV(72,0);
254 GvLINE(gv) = PL_curcop->cop_line;
270 if (!AvREAL(oav) && AvREIFY(oav))
277 GvAV(gv) = Null(AV*);
280 SvMAGIC(av) = SvMAGIC(oav);
281 SvFLAGS(av) |= SvMAGICAL(oav);
299 SSPUSHPTR(ohv = GvHVn(gv));
302 GvHV(gv) = Null(HV*);
305 SvMAGIC(hv) = SvMAGIC(ohv);
306 SvFLAGS(hv) |= SvMAGICAL(ohv);
317 save_item(register SV *item)
320 register SV *sv = NEWSV(0,0);
324 SSPUSHPTR(item); /* remember the pointer */
325 SSPUSHPTR(sv); /* remember the value */
326 SSPUSHINT(SAVEt_ITEM);
336 SSPUSHINT(SAVEt_INT);
340 save_long(long int *longp)
346 SSPUSHINT(SAVEt_LONG);
356 SSPUSHINT(SAVEt_I32);
366 SSPUSHINT(SAVEt_I16);
379 /* Cannot use save_sptr() to store a char* since the SV** cast will
380 * force word-alignment and we'll miss the pointer.
383 save_pptr(char **pptr)
389 SSPUSHINT(SAVEt_PPTR);
399 SSPUSHINT(SAVEt_SPTR);
403 save_threadsv(PADOFFSET i)
407 SV **svp = &THREADSV(i); /* XXX Change to save by offset */
408 DEBUG_S(PerlIO_printf(PerlIO_stderr(), "save_threadsv %u: %p %p:%s\n",
409 i, svp, *svp, SvPEEK(*svp)));
413 croak("panic: save_threadsv called in non-threaded perl");
415 #endif /* USE_THREADS */
424 SSPUSHINT(SAVEt_NSTAB);
434 SSPUSHINT(SAVEt_HPTR);
444 SSPUSHINT(SAVEt_APTR);
453 SSPUSHINT(SAVEt_FREESV);
462 SSPUSHINT(SAVEt_FREEOP);
466 save_freepv(char *pv)
471 SSPUSHINT(SAVEt_FREEPV);
475 save_clearsv(SV **svp)
479 SSPUSHLONG((long)(svp-PL_curpad));
480 SSPUSHINT(SAVEt_CLEARSV);
484 save_delete(HV *hv, char *key, I32 klen)
490 SSPUSHPTR(SvREFCNT_inc(hv));
491 SSPUSHINT(SAVEt_DELETE);
495 save_list(register SV **sarg, I32 maxsarg)
501 for (i = 1; i <= maxsarg; i++) {
503 sv_setsv(sv,sarg[i]);
505 SSPUSHPTR(sarg[i]); /* remember the pointer */
506 SSPUSHPTR(sv); /* remember the value */
507 SSPUSHINT(SAVEt_ITEM);
513 save_destructor(DESTRUCTORFUNC f, void* p)
515 save_destructor(void (*f) (void *), void *p)
522 SSPUSHINT(SAVEt_DESTRUCTOR);
526 save_aelem(AV *av, I32 idx, SV **sptr)
530 SSPUSHPTR(SvREFCNT_inc(av));
532 SSPUSHPTR(SvREFCNT_inc(*sptr));
533 SSPUSHINT(SAVEt_AELEM);
534 save_scalar_at(sptr);
538 save_helem(HV *hv, SV *key, SV **sptr)
542 SSPUSHPTR(SvREFCNT_inc(hv));
543 SSPUSHPTR(SvREFCNT_inc(key));
544 SSPUSHPTR(SvREFCNT_inc(*sptr));
545 SSPUSHINT(SAVEt_HELEM);
546 save_scalar_at(sptr);
559 save_alloc(I32 size, I32 pad)
562 register I32 start = pad + ((char*)&PL_savestack[PL_savestack_ix]
563 - (char*)PL_savestack);
564 register I32 elems = 1 + ((size + pad - 1) / sizeof(*PL_savestack));
566 /* SSCHECK may not be good enough */
567 while (PL_savestack_ix + elems + 2 > PL_savestack_max)
570 PL_savestack_ix += elems;
572 SSPUSHINT(SAVEt_ALLOC);
577 leave_scope(I32 base)
589 croak("panic: corrupt saved stack index");
590 while (PL_savestack_ix > base) {
592 case SAVEt_ITEM: /* normal string */
593 value = (SV*)SSPOPPTR;
595 sv_replace(sv,value);
600 case SAVEt_SV: /* scalar reference */
601 value = (SV*)SSPOPPTR;
606 case SAVEt_GENERIC_SVREF: /* generic sv */
607 value = (SV*)SSPOPPTR;
616 case SAVEt_SVREF: /* scalar reference */
617 value = (SV*)SSPOPPTR;
621 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
622 "restore svref: %p %p:%s -> %p:%s\n",
623 ptr, sv, SvPEEK(sv), value, SvPEEK(value)));
624 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
625 SvTYPE(sv) != SVt_PVGV)
627 (void)SvUPGRADE(value, SvTYPE(sv));
628 SvMAGIC(value) = SvMAGIC(sv);
629 SvFLAGS(value) |= SvMAGICAL(sv);
633 else if (SvTYPE(value) >= SVt_PVMG && SvMAGIC(value) &&
634 SvTYPE(value) != SVt_PVGV)
636 SvFLAGS(value) |= (SvFLAGS(value) &
637 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
638 SvMAGICAL_off(value);
648 case SAVEt_AV: /* array reference */
652 AV *goner = GvAV(gv);
653 SvMAGIC(av) = SvMAGIC(goner);
654 SvFLAGS(av) |= SvMAGICAL(goner);
655 SvMAGICAL_off(goner);
666 case SAVEt_HV: /* hash reference */
670 HV *goner = GvHV(gv);
671 SvMAGIC(hv) = SvMAGIC(goner);
672 SvFLAGS(hv) |= SvMAGICAL(goner);
673 SvMAGICAL_off(goner);
684 case SAVEt_INT: /* int reference */
686 *(int*)ptr = (int)SSPOPINT;
688 case SAVEt_LONG: /* long reference */
690 *(long*)ptr = (long)SSPOPLONG;
692 case SAVEt_I32: /* I32 reference */
694 *(I32*)ptr = (I32)SSPOPINT;
696 case SAVEt_I16: /* I16 reference */
698 *(I16*)ptr = (I16)SSPOPINT;
700 case SAVEt_IV: /* IV reference */
702 *(IV*)ptr = (IV)SSPOPIV;
704 case SAVEt_SPTR: /* SV* reference */
706 *(SV**)ptr = (SV*)SSPOPPTR;
708 case SAVEt_PPTR: /* char* reference */
710 *(char**)ptr = (char*)SSPOPPTR;
712 case SAVEt_HPTR: /* HV* reference */
714 *(HV**)ptr = (HV*)SSPOPPTR;
716 case SAVEt_APTR: /* AV* reference */
718 *(AV**)ptr = (AV*)SSPOPPTR;
722 (void)sv_clear((SV*)gv);
724 case SAVEt_GP: /* scalar reference */
727 if (SvPVX(gv) && SvLEN(gv) > 0) {
730 SvPVX(gv) = (char *)SSPOPPTR;
731 SvCUR(gv) = (STRLEN)SSPOPIV;
732 SvLEN(gv) = (STRLEN)SSPOPIV;
736 PL_sub_generation++; /* putting a method back into circulation */
741 SvREFCNT_dec((SV*)ptr);
746 PL_curpad = AvARRAY(PL_comppad);
751 Safefree((char*)ptr);
754 ptr = (void*)&PL_curpad[SSPOPLONG];
756 /* Can clear pad variable in place? */
757 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
758 if (SvTHINKFIRST(sv))
763 switch (SvTYPE(sv)) {
773 croak("panic: leave_scope pad code");
785 else { /* Someone has a claim on this, so abandon it. */
786 U32 padflags = SvFLAGS(sv) & (SVs_PADBUSY|SVs_PADMY|SVs_PADTMP);
787 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
788 case SVt_PVAV: *(SV**)ptr = (SV*)newAV(); break;
789 case SVt_PVHV: *(SV**)ptr = (SV*)newHV(); break;
790 default: *(SV**)ptr = NEWSV(0,0); break;
792 SvREFCNT_dec(sv); /* Cast current value to the winds. */
793 SvFLAGS(*(SV**)ptr) |= padflags; /* preserve pad nature */
800 (void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
804 case SAVEt_DESTRUCTOR:
806 (CALLDESTRUCTOR)(ptr);
808 case SAVEt_REGCONTEXT:
811 PL_savestack_ix -= i; /* regexp must have croaked */
813 case SAVEt_STACK_POS: /* Position on Perl stack */
815 PL_stack_sp = PL_stack_base + i;
817 case SAVEt_AELEM: /* array element */
818 value = (SV*)SSPOPPTR;
821 ptr = av_fetch(av,i,1);
824 if (sv && sv != &PL_sv_undef) {
825 if (SvTIED_mg((SV*)av, 'P'))
826 (void)SvREFCNT_inc(sv);
834 case SAVEt_HELEM: /* hash element */
835 value = (SV*)SSPOPPTR;
838 ptr = hv_fetch_ent(hv, sv, 1, 0);
840 SV *oval = HeVAL((HE*)ptr);
841 if (oval && oval != &PL_sv_undef) {
842 ptr = &HeVAL((HE*)ptr);
843 if (SvTIED_mg((SV*)hv, 'P'))
844 (void)SvREFCNT_inc(*(SV**)ptr);
855 PL_op = (OP*)SSPOPPTR;
858 if (GvHV(PL_hintgv)) {
859 SvREFCNT_dec((SV*)GvHV(PL_hintgv));
860 GvHV(PL_hintgv) = NULL;
862 *(I32*)&PL_hints = (I32)SSPOPINT;
865 croak("panic: leave_scope inconsistency");
871 cx_dump(PERL_CONTEXT *cx)
875 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]);
876 if (CxTYPE(cx) != CXt_SUBST) {
877 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
878 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop);
879 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
880 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
881 PerlIO_printf(Perl_debug_log, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
882 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm);
883 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
885 switch (CxTYPE(cx)) {
890 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%lx\n",
891 (long)cx->blk_sub.cv);
892 PerlIO_printf(Perl_debug_log, "BLK_SUB.GV = 0x%lx\n",
893 (long)cx->blk_sub.gv);
894 PerlIO_printf(Perl_debug_log, "BLK_SUB.DFOUTGV = 0x%lx\n",
895 (long)cx->blk_sub.dfoutgv);
896 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
897 (long)cx->blk_sub.olddepth);
898 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
899 (int)cx->blk_sub.hasargs);
902 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
903 (long)cx->blk_eval.old_in_eval);
904 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
905 PL_op_name[cx->blk_eval.old_op_type],
906 PL_op_desc[cx->blk_eval.old_op_type]);
907 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
908 cx->blk_eval.old_name);
909 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n",
910 (long)cx->blk_eval.old_eval_root);
914 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n",
916 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
917 (long)cx->blk_loop.resetsp);
918 PerlIO_printf(Perl_debug_log, "BLK_LOOP.REDO_OP = 0x%lx\n",
919 (long)cx->blk_loop.redo_op);
920 PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%lx\n",
921 (long)cx->blk_loop.next_op);
922 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LAST_OP = 0x%lx\n",
923 (long)cx->blk_loop.last_op);
924 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
925 (long)cx->blk_loop.iterix);
926 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%lx\n",
927 (long)cx->blk_loop.iterary);
928 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%lx\n",
929 (long)cx->blk_loop.itervar);
930 if (cx->blk_loop.itervar)
931 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%lx\n",
932 (long)cx->blk_loop.itersave);
933 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERLVAL = 0x%lx\n",
934 (long)cx->blk_loop.iterlval);
938 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
940 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
941 (long)cx->sb_maxiters);
942 PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n",
943 (long)cx->sb_rflags);
944 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
946 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
948 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%lx\n",
950 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%lx\n",
952 PerlIO_printf(Perl_debug_log, "SB_S = 0x%lx\n",
954 PerlIO_printf(Perl_debug_log, "SB_M = 0x%lx\n",
956 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%lx\n",
957 (long)cx->sb_strend);
958 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%lx\n",
962 #endif /* DEBUGGING */