3 * Copyright (c) 1991-1997, 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 /* XXX should tmps_floor live in cxstack? */
142 I32 myfloor = PL_tmps_floor;
143 while (PL_tmps_ix > myfloor) { /* clean up after last statement */
144 SV* sv = PL_tmps_stack[PL_tmps_ix];
145 PL_tmps_stack[PL_tmps_ix--] = Nullsv;
148 SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */
154 save_scalar_at(SV **sptr)
160 sv = *sptr = NEWSV(0,0);
161 if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
162 sv_upgrade(sv, SvTYPE(osv));
163 if (SvGMAGICAL(osv)) {
165 bool oldtainted = PL_tainted;
167 if (PL_tainting && PL_tainted && (mg = mg_find(osv, 't'))) {
168 SAVESPTR(mg->mg_obj);
171 SvFLAGS(osv) |= (SvFLAGS(osv) &
172 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
173 PL_tainted = oldtainted;
175 SvMAGIC(sv) = SvMAGIC(osv);
176 SvFLAGS(sv) |= SvMAGICAL(osv);
188 SV **sptr = &GvSV(gv);
190 SSPUSHPTR(SvREFCNT_inc(gv));
191 SSPUSHPTR(SvREFCNT_inc(*sptr));
193 return save_scalar_at(sptr);
197 save_svref(SV **sptr)
202 SSPUSHPTR(SvREFCNT_inc(*sptr));
203 SSPUSHINT(SAVEt_SVREF);
204 return save_scalar_at(sptr);
208 save_gp(GV *gv, I32 empty)
212 SSPUSHIV((IV)SvLEN(gv));
213 SvLEN(gv) = 0; /* forget that anything was allocated here */
214 SSPUSHIV((IV)SvCUR(gv));
215 SSPUSHPTR(SvPVX(gv));
217 SSPUSHPTR(SvREFCNT_inc(gv));
225 PL_sub_generation++; /* taking a method out of circulation */
226 Newz(602, gp, 1, GP);
227 GvGP(gv) = gp_ref(gp);
228 GvSV(gv) = NEWSV(72,0);
229 GvLINE(gv) = PL_curcop->cop_line;
245 if (!AvREAL(oav) && AvREIFY(oav))
252 GvAV(gv) = Null(AV*);
255 SvMAGIC(av) = SvMAGIC(oav);
256 SvFLAGS(av) |= SvMAGICAL(oav);
274 SSPUSHPTR(ohv = GvHVn(gv));
277 GvHV(gv) = Null(HV*);
280 SvMAGIC(hv) = SvMAGIC(ohv);
281 SvFLAGS(hv) |= SvMAGICAL(ohv);
292 save_item(register SV *item)
295 register SV *sv = NEWSV(0,0);
299 SSPUSHPTR(item); /* remember the pointer */
300 SSPUSHPTR(sv); /* remember the value */
301 SSPUSHINT(SAVEt_ITEM);
311 SSPUSHINT(SAVEt_INT);
315 save_long(long int *longp)
321 SSPUSHINT(SAVEt_LONG);
331 SSPUSHINT(SAVEt_I32);
341 SSPUSHINT(SAVEt_I16);
354 /* Cannot use save_sptr() to store a char* since the SV** cast will
355 * force word-alignment and we'll miss the pointer.
358 save_pptr(char **pptr)
364 SSPUSHINT(SAVEt_PPTR);
374 SSPUSHINT(SAVEt_SPTR);
378 save_threadsv(PADOFFSET i)
382 SV **svp = &THREADSV(i); /* XXX Change to save by offset */
383 DEBUG_S(PerlIO_printf(PerlIO_stderr(), "save_threadsv %u: %p %p:%s\n",
384 i, svp, *svp, SvPEEK(*svp)));
388 croak("panic: save_threadsv called in non-threaded perl");
390 #endif /* USE_THREADS */
399 SSPUSHINT(SAVEt_NSTAB);
409 SSPUSHINT(SAVEt_HPTR);
419 SSPUSHINT(SAVEt_APTR);
428 SSPUSHINT(SAVEt_FREESV);
437 SSPUSHINT(SAVEt_FREEOP);
441 save_freepv(char *pv)
446 SSPUSHINT(SAVEt_FREEPV);
450 save_clearsv(SV **svp)
454 SSPUSHLONG((long)(svp-PL_curpad));
455 SSPUSHINT(SAVEt_CLEARSV);
459 save_delete(HV *hv, char *key, I32 klen)
465 SSPUSHPTR(SvREFCNT_inc(hv));
466 SSPUSHINT(SAVEt_DELETE);
470 save_list(register SV **sarg, I32 maxsarg)
476 for (i = 1; i <= maxsarg; i++) {
478 sv_setsv(sv,sarg[i]);
480 SSPUSHPTR(sarg[i]); /* remember the pointer */
481 SSPUSHPTR(sv); /* remember the value */
482 SSPUSHINT(SAVEt_ITEM);
488 save_destructor(DESTRUCTORFUNC f, void* p)
490 save_destructor(void (*f) (void *), void *p)
497 SSPUSHINT(SAVEt_DESTRUCTOR);
501 save_aelem(AV *av, I32 idx, SV **sptr)
505 SSPUSHPTR(SvREFCNT_inc(av));
507 SSPUSHPTR(SvREFCNT_inc(*sptr));
508 SSPUSHINT(SAVEt_AELEM);
509 save_scalar_at(sptr);
513 save_helem(HV *hv, SV *key, SV **sptr)
517 SSPUSHPTR(SvREFCNT_inc(hv));
518 SSPUSHPTR(SvREFCNT_inc(key));
519 SSPUSHPTR(SvREFCNT_inc(*sptr));
520 SSPUSHINT(SAVEt_HELEM);
521 save_scalar_at(sptr);
534 save_alloc(I32 size, I32 pad)
537 register I32 start = pad + ((char*)&PL_savestack[PL_savestack_ix]
538 - (char*)PL_savestack);
539 register I32 elems = 1 + ((size + pad - 1) / sizeof(*PL_savestack));
541 /* SSCHECK may not be good enough */
542 while (PL_savestack_ix + elems + 2 > PL_savestack_max)
545 PL_savestack_ix += elems;
547 SSPUSHINT(SAVEt_ALLOC);
552 leave_scope(I32 base)
564 croak("panic: corrupt saved stack index");
565 while (PL_savestack_ix > base) {
567 case SAVEt_ITEM: /* normal string */
568 value = (SV*)SSPOPPTR;
570 sv_replace(sv,value);
575 case SAVEt_SV: /* scalar reference */
576 value = (SV*)SSPOPPTR;
581 case SAVEt_SVREF: /* scalar reference */
582 value = (SV*)SSPOPPTR;
586 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
587 "restore svref: %p %p:%s -> %p:%s\n",
588 ptr, sv, SvPEEK(sv), value, SvPEEK(value)));
589 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
590 SvTYPE(sv) != SVt_PVGV)
592 (void)SvUPGRADE(value, SvTYPE(sv));
593 SvMAGIC(value) = SvMAGIC(sv);
594 SvFLAGS(value) |= SvMAGICAL(sv);
598 else if (SvTYPE(value) >= SVt_PVMG && SvMAGIC(value) &&
599 SvTYPE(value) != SVt_PVGV)
601 SvFLAGS(value) |= (SvFLAGS(value) &
602 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
603 SvMAGICAL_off(value);
613 case SAVEt_AV: /* array reference */
617 AV *goner = GvAV(gv);
618 SvMAGIC(av) = SvMAGIC(goner);
619 SvFLAGS(av) |= SvMAGICAL(goner);
620 SvMAGICAL_off(goner);
631 case SAVEt_HV: /* hash reference */
635 HV *goner = GvHV(gv);
636 SvMAGIC(hv) = SvMAGIC(goner);
637 SvFLAGS(hv) |= SvMAGICAL(goner);
638 SvMAGICAL_off(goner);
649 case SAVEt_INT: /* int reference */
651 *(int*)ptr = (int)SSPOPINT;
653 case SAVEt_LONG: /* long reference */
655 *(long*)ptr = (long)SSPOPLONG;
657 case SAVEt_I32: /* I32 reference */
659 *(I32*)ptr = (I32)SSPOPINT;
661 case SAVEt_I16: /* I16 reference */
663 *(I16*)ptr = (I16)SSPOPINT;
665 case SAVEt_IV: /* IV reference */
667 *(IV*)ptr = (IV)SSPOPIV;
669 case SAVEt_SPTR: /* SV* reference */
671 *(SV**)ptr = (SV*)SSPOPPTR;
673 case SAVEt_PPTR: /* char* reference */
675 *(char**)ptr = (char*)SSPOPPTR;
677 case SAVEt_HPTR: /* HV* reference */
679 *(HV**)ptr = (HV*)SSPOPPTR;
681 case SAVEt_APTR: /* AV* reference */
683 *(AV**)ptr = (AV*)SSPOPPTR;
687 (void)sv_clear((SV*)gv);
689 case SAVEt_GP: /* scalar reference */
692 if (SvPVX(gv) && SvLEN(gv) > 0) {
695 SvPVX(gv) = (char *)SSPOPPTR;
696 SvCUR(gv) = (STRLEN)SSPOPIV;
697 SvLEN(gv) = (STRLEN)SSPOPIV;
701 PL_sub_generation++; /* putting a method back into circulation */
706 SvREFCNT_dec((SV*)ptr);
711 PL_curpad = AvARRAY(PL_comppad);
716 Safefree((char*)ptr);
719 ptr = (void*)&PL_curpad[SSPOPLONG];
721 /* Can clear pad variable in place? */
722 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
723 if (SvTHINKFIRST(sv)) {
725 croak("panic: leave_scope clearsv");
732 switch (SvTYPE(sv)) {
742 croak("panic: leave_scope pad code");
754 else { /* Someone has a claim on this, so abandon it. */
755 U32 padflags = SvFLAGS(sv) & (SVs_PADBUSY|SVs_PADMY|SVs_PADTMP);
756 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
757 case SVt_PVAV: *(SV**)ptr = (SV*)newAV(); break;
758 case SVt_PVHV: *(SV**)ptr = (SV*)newHV(); break;
759 default: *(SV**)ptr = NEWSV(0,0); break;
761 SvREFCNT_dec(sv); /* Cast current value to the winds. */
762 SvFLAGS(*(SV**)ptr) |= padflags; /* preserve pad nature */
769 (void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
773 case SAVEt_DESTRUCTOR:
775 (CALLDESTRUCTOR)(ptr);
777 case SAVEt_REGCONTEXT:
780 PL_savestack_ix -= i; /* regexp must have croaked */
782 case SAVEt_STACK_POS: /* Position on Perl stack */
784 PL_stack_sp = PL_stack_base + i;
786 case SAVEt_AELEM: /* array element */
787 value = (SV*)SSPOPPTR;
790 ptr = av_fetch(av,i,1);
793 if (sv && sv != &PL_sv_undef) {
794 if (SvRMAGICAL(av) && mg_find((SV*)av, 'P'))
795 (void)SvREFCNT_inc(sv);
803 case SAVEt_HELEM: /* hash element */
804 value = (SV*)SSPOPPTR;
807 ptr = hv_fetch_ent(hv, sv, 1, 0);
809 SV *oval = HeVAL((HE*)ptr);
810 if (oval && oval != &PL_sv_undef) {
811 ptr = &HeVAL((HE*)ptr);
812 if (SvRMAGICAL(hv) && mg_find((SV*)hv, 'P'))
813 (void)SvREFCNT_inc(*(SV**)ptr);
824 PL_op = (OP*)SSPOPPTR;
827 if (GvHV(PL_hintgv)) {
828 SvREFCNT_dec((SV*)GvHV(PL_hintgv));
829 GvHV(PL_hintgv) = NULL;
831 *(I32*)&PL_hints = (I32)SSPOPINT;
834 croak("panic: leave_scope inconsistency");
840 cx_dump(PERL_CONTEXT *cx)
844 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), block_type[CxTYPE(cx)]);
845 if (CxTYPE(cx) != CXt_SUBST) {
846 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
847 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop);
848 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
849 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
850 PerlIO_printf(Perl_debug_log, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
851 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm);
852 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
854 switch (CxTYPE(cx)) {
859 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%lx\n",
860 (long)cx->blk_sub.cv);
861 PerlIO_printf(Perl_debug_log, "BLK_SUB.GV = 0x%lx\n",
862 (long)cx->blk_sub.gv);
863 PerlIO_printf(Perl_debug_log, "BLK_SUB.DFOUTGV = 0x%lx\n",
864 (long)cx->blk_sub.dfoutgv);
865 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
866 (long)cx->blk_sub.olddepth);
867 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
868 (int)cx->blk_sub.hasargs);
871 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
872 (long)cx->blk_eval.old_in_eval);
873 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
874 op_name[cx->blk_eval.old_op_type],
875 op_desc[cx->blk_eval.old_op_type]);
876 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
877 cx->blk_eval.old_name);
878 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n",
879 (long)cx->blk_eval.old_eval_root);
883 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n",
885 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
886 (long)cx->blk_loop.resetsp);
887 PerlIO_printf(Perl_debug_log, "BLK_LOOP.REDO_OP = 0x%lx\n",
888 (long)cx->blk_loop.redo_op);
889 PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%lx\n",
890 (long)cx->blk_loop.next_op);
891 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LAST_OP = 0x%lx\n",
892 (long)cx->blk_loop.last_op);
893 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
894 (long)cx->blk_loop.iterix);
895 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%lx\n",
896 (long)cx->blk_loop.iterary);
897 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%lx\n",
898 (long)cx->blk_loop.itervar);
899 if (cx->blk_loop.itervar)
900 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%lx\n",
901 (long)cx->blk_loop.itersave);
902 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERLVAL = 0x%lx\n",
903 (long)cx->blk_loop.iterlval);
907 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
909 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
910 (long)cx->sb_maxiters);
911 PerlIO_printf(Perl_debug_log, "SB_SAFEBASE = %ld\n",
912 (long)cx->sb_safebase);
913 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
915 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
917 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%lx\n",
919 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%lx\n",
921 PerlIO_printf(Perl_debug_log, "SB_S = 0x%lx\n",
923 PerlIO_printf(Perl_debug_log, "SB_M = 0x%lx\n",
925 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%lx\n",
926 (long)cx->sb_strend);
927 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%lx\n",
931 #endif /* DEBUGGING */