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 /* 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);
207 /* Like save_svref(), but doesn't deal with magic. Can be used to
208 * restore a global SV to its prior contents, freeing new value. */
210 save_generic_svref(SV **sptr)
215 SSPUSHPTR(SvREFCNT_inc(*sptr));
216 SSPUSHINT(SAVEt_GENERIC_SVREF);
220 save_gp(GV *gv, I32 empty)
224 SSPUSHIV((IV)SvLEN(gv));
225 SvLEN(gv) = 0; /* forget that anything was allocated here */
226 SSPUSHIV((IV)SvCUR(gv));
227 SSPUSHPTR(SvPVX(gv));
229 SSPUSHPTR(SvREFCNT_inc(gv));
237 PL_sub_generation++; /* taking a method out of circulation */
238 Newz(602, gp, 1, GP);
239 GvGP(gv) = gp_ref(gp);
240 GvSV(gv) = NEWSV(72,0);
241 GvLINE(gv) = PL_curcop->cop_line;
257 if (!AvREAL(oav) && AvREIFY(oav))
264 GvAV(gv) = Null(AV*);
267 SvMAGIC(av) = SvMAGIC(oav);
268 SvFLAGS(av) |= SvMAGICAL(oav);
286 SSPUSHPTR(ohv = GvHVn(gv));
289 GvHV(gv) = Null(HV*);
292 SvMAGIC(hv) = SvMAGIC(ohv);
293 SvFLAGS(hv) |= SvMAGICAL(ohv);
304 save_item(register SV *item)
307 register SV *sv = NEWSV(0,0);
311 SSPUSHPTR(item); /* remember the pointer */
312 SSPUSHPTR(sv); /* remember the value */
313 SSPUSHINT(SAVEt_ITEM);
323 SSPUSHINT(SAVEt_INT);
327 save_long(long int *longp)
333 SSPUSHINT(SAVEt_LONG);
343 SSPUSHINT(SAVEt_I32);
353 SSPUSHINT(SAVEt_I16);
366 /* Cannot use save_sptr() to store a char* since the SV** cast will
367 * force word-alignment and we'll miss the pointer.
370 save_pptr(char **pptr)
376 SSPUSHINT(SAVEt_PPTR);
386 SSPUSHINT(SAVEt_SPTR);
390 save_threadsv(PADOFFSET i)
394 SV **svp = &THREADSV(i); /* XXX Change to save by offset */
395 DEBUG_S(PerlIO_printf(PerlIO_stderr(), "save_threadsv %u: %p %p:%s\n",
396 i, svp, *svp, SvPEEK(*svp)));
400 croak("panic: save_threadsv called in non-threaded perl");
402 #endif /* USE_THREADS */
411 SSPUSHINT(SAVEt_NSTAB);
421 SSPUSHINT(SAVEt_HPTR);
431 SSPUSHINT(SAVEt_APTR);
440 SSPUSHINT(SAVEt_FREESV);
449 SSPUSHINT(SAVEt_FREEOP);
453 save_freepv(char *pv)
458 SSPUSHINT(SAVEt_FREEPV);
462 save_clearsv(SV **svp)
466 SSPUSHLONG((long)(svp-PL_curpad));
467 SSPUSHINT(SAVEt_CLEARSV);
471 save_delete(HV *hv, char *key, I32 klen)
477 SSPUSHPTR(SvREFCNT_inc(hv));
478 SSPUSHINT(SAVEt_DELETE);
482 save_list(register SV **sarg, I32 maxsarg)
488 for (i = 1; i <= maxsarg; i++) {
490 sv_setsv(sv,sarg[i]);
492 SSPUSHPTR(sarg[i]); /* remember the pointer */
493 SSPUSHPTR(sv); /* remember the value */
494 SSPUSHINT(SAVEt_ITEM);
500 save_destructor(DESTRUCTORFUNC f, void* p)
502 save_destructor(void (*f) (void *), void *p)
509 SSPUSHINT(SAVEt_DESTRUCTOR);
513 save_aelem(AV *av, I32 idx, SV **sptr)
517 SSPUSHPTR(SvREFCNT_inc(av));
519 SSPUSHPTR(SvREFCNT_inc(*sptr));
520 SSPUSHINT(SAVEt_AELEM);
521 save_scalar_at(sptr);
525 save_helem(HV *hv, SV *key, SV **sptr)
529 SSPUSHPTR(SvREFCNT_inc(hv));
530 SSPUSHPTR(SvREFCNT_inc(key));
531 SSPUSHPTR(SvREFCNT_inc(*sptr));
532 SSPUSHINT(SAVEt_HELEM);
533 save_scalar_at(sptr);
546 leave_scope(I32 base)
558 croak("panic: corrupt saved stack index");
559 while (PL_savestack_ix > base) {
561 case SAVEt_ITEM: /* normal string */
562 value = (SV*)SSPOPPTR;
564 sv_replace(sv,value);
569 case SAVEt_SV: /* scalar reference */
570 value = (SV*)SSPOPPTR;
575 case SAVEt_GENERIC_SVREF: /* generic sv */
576 value = (SV*)SSPOPPTR;
585 case SAVEt_SVREF: /* scalar reference */
586 value = (SV*)SSPOPPTR;
590 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
591 "restore svref: %p %p:%s -> %p:%s\n",
592 ptr, sv, SvPEEK(sv), value, SvPEEK(value)));
593 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
594 SvTYPE(sv) != SVt_PVGV)
596 (void)SvUPGRADE(value, SvTYPE(sv));
597 SvMAGIC(value) = SvMAGIC(sv);
598 SvFLAGS(value) |= SvMAGICAL(sv);
602 else if (SvTYPE(value) >= SVt_PVMG && SvMAGIC(value) &&
603 SvTYPE(value) != SVt_PVGV)
605 SvFLAGS(value) |= (SvFLAGS(value) &
606 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
607 SvMAGICAL_off(value);
617 case SAVEt_AV: /* array reference */
621 AV *goner = GvAV(gv);
622 SvMAGIC(av) = SvMAGIC(goner);
623 SvFLAGS(av) |= SvMAGICAL(goner);
624 SvMAGICAL_off(goner);
635 case SAVEt_HV: /* hash reference */
639 HV *goner = GvHV(gv);
640 SvMAGIC(hv) = SvMAGIC(goner);
641 SvFLAGS(hv) |= SvMAGICAL(goner);
642 SvMAGICAL_off(goner);
653 case SAVEt_INT: /* int reference */
655 *(int*)ptr = (int)SSPOPINT;
657 case SAVEt_LONG: /* long reference */
659 *(long*)ptr = (long)SSPOPLONG;
661 case SAVEt_I32: /* I32 reference */
663 *(I32*)ptr = (I32)SSPOPINT;
665 case SAVEt_I16: /* I16 reference */
667 *(I16*)ptr = (I16)SSPOPINT;
669 case SAVEt_IV: /* IV reference */
671 *(IV*)ptr = (IV)SSPOPIV;
673 case SAVEt_SPTR: /* SV* reference */
675 *(SV**)ptr = (SV*)SSPOPPTR;
677 case SAVEt_PPTR: /* char* reference */
679 *(char**)ptr = (char*)SSPOPPTR;
681 case SAVEt_HPTR: /* HV* reference */
683 *(HV**)ptr = (HV*)SSPOPPTR;
685 case SAVEt_APTR: /* AV* reference */
687 *(AV**)ptr = (AV*)SSPOPPTR;
691 (void)sv_clear((SV*)gv);
693 case SAVEt_GP: /* scalar reference */
696 if (SvPVX(gv) && SvLEN(gv) > 0) {
699 SvPVX(gv) = (char *)SSPOPPTR;
700 SvCUR(gv) = (STRLEN)SSPOPIV;
701 SvLEN(gv) = (STRLEN)SSPOPIV;
705 PL_sub_generation++; /* putting a method back into circulation */
710 SvREFCNT_dec((SV*)ptr);
715 PL_curpad = AvARRAY(PL_comppad);
720 Safefree((char*)ptr);
723 ptr = (void*)&PL_curpad[SSPOPLONG];
725 /* Can clear pad variable in place? */
726 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
727 if (SvTHINKFIRST(sv)) {
729 croak("panic: leave_scope clearsv");
736 switch (SvTYPE(sv)) {
746 croak("panic: leave_scope pad code");
758 else { /* Someone has a claim on this, so abandon it. */
759 U32 padflags = SvFLAGS(sv) & (SVs_PADBUSY|SVs_PADMY|SVs_PADTMP);
760 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
761 case SVt_PVAV: *(SV**)ptr = (SV*)newAV(); break;
762 case SVt_PVHV: *(SV**)ptr = (SV*)newHV(); break;
763 default: *(SV**)ptr = NEWSV(0,0); break;
765 SvREFCNT_dec(sv); /* Cast current value to the winds. */
766 SvFLAGS(*(SV**)ptr) |= padflags; /* preserve pad nature */
773 (void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
777 case SAVEt_DESTRUCTOR:
779 (CALLDESTRUCTOR)(ptr);
781 case SAVEt_REGCONTEXT:
783 PL_savestack_ix -= i; /* regexp must have croaked */
785 case SAVEt_STACK_POS: /* Position on Perl stack */
787 PL_stack_sp = PL_stack_base + i;
789 case SAVEt_AELEM: /* array element */
790 value = (SV*)SSPOPPTR;
793 ptr = av_fetch(av,i,1);
796 if (sv && sv != &PL_sv_undef) {
797 if (SvTIED_mg((SV*)av, 'P'))
798 (void)SvREFCNT_inc(sv);
806 case SAVEt_HELEM: /* hash element */
807 value = (SV*)SSPOPPTR;
810 ptr = hv_fetch_ent(hv, sv, 1, 0);
812 SV *oval = HeVAL((HE*)ptr);
813 if (oval && oval != &PL_sv_undef) {
814 ptr = &HeVAL((HE*)ptr);
815 if (SvTIED_mg((SV*)hv, 'P'))
816 (void)SvREFCNT_inc(*(SV**)ptr);
827 PL_op = (OP*)SSPOPPTR;
830 if (GvHV(PL_hintgv)) {
831 SvREFCNT_dec((SV*)GvHV(PL_hintgv));
832 GvHV(PL_hintgv) = NULL;
834 *(I32*)&PL_hints = (I32)SSPOPINT;
837 croak("panic: leave_scope inconsistency");
843 cx_dump(PERL_CONTEXT *cx)
847 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), block_type[CxTYPE(cx)]);
848 if (CxTYPE(cx) != CXt_SUBST) {
849 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
850 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop);
851 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
852 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
853 PerlIO_printf(Perl_debug_log, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
854 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm);
855 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
857 switch (CxTYPE(cx)) {
862 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%lx\n",
863 (long)cx->blk_sub.cv);
864 PerlIO_printf(Perl_debug_log, "BLK_SUB.GV = 0x%lx\n",
865 (long)cx->blk_sub.gv);
866 PerlIO_printf(Perl_debug_log, "BLK_SUB.DFOUTGV = 0x%lx\n",
867 (long)cx->blk_sub.dfoutgv);
868 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
869 (long)cx->blk_sub.olddepth);
870 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
871 (int)cx->blk_sub.hasargs);
874 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
875 (long)cx->blk_eval.old_in_eval);
876 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
877 op_name[cx->blk_eval.old_op_type],
878 op_desc[cx->blk_eval.old_op_type]);
879 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
880 cx->blk_eval.old_name);
881 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n",
882 (long)cx->blk_eval.old_eval_root);
886 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n",
888 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
889 (long)cx->blk_loop.resetsp);
890 PerlIO_printf(Perl_debug_log, "BLK_LOOP.REDO_OP = 0x%lx\n",
891 (long)cx->blk_loop.redo_op);
892 PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%lx\n",
893 (long)cx->blk_loop.next_op);
894 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LAST_OP = 0x%lx\n",
895 (long)cx->blk_loop.last_op);
896 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
897 (long)cx->blk_loop.iterix);
898 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%lx\n",
899 (long)cx->blk_loop.iterary);
900 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%lx\n",
901 (long)cx->blk_loop.itervar);
902 if (cx->blk_loop.itervar)
903 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%lx\n",
904 (long)cx->blk_loop.itersave);
905 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERLVAL = 0x%lx\n",
906 (long)cx->blk_loop.iterlval);
910 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
912 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
913 (long)cx->sb_maxiters);
914 PerlIO_printf(Perl_debug_log, "SB_SAFEBASE = %ld\n",
915 (long)cx->sb_safebase);
916 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
918 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
920 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%lx\n",
922 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%lx\n",
924 PerlIO_printf(Perl_debug_log, "SB_S = 0x%lx\n",
926 PerlIO_printf(Perl_debug_log, "SB_M = 0x%lx\n",
928 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%lx\n",
929 (long)cx->sb_strend);
930 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%lx\n",
934 #endif /* DEBUGGING */