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(curstack, (p - stack_base) + (n) + 128);
31 av_extend(curstack, (p - 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] = &sv_undef;
55 AvFILLp(si->si_stack) = 0;
58 si->si_cxmax = cxitems - 1;
60 si->si_type = SI_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 (retstack_ix == retstack_max) {
79 retstack_max = GROW(retstack_max);
80 Renew(retstack, retstack_max, OP*);
82 retstack[retstack_ix++] = retop;
90 return retstack[--retstack_ix];
99 if (scopestack_ix == scopestack_max) {
100 scopestack_max = GROW(scopestack_max);
101 Renew(scopestack, scopestack_max, I32);
103 scopestack[scopestack_ix++] = savestack_ix;
111 I32 oldsave = scopestack[--scopestack_ix];
112 LEAVE_SCOPE(oldsave);
119 I32 oldmax = markstack_max - markstack;
120 I32 newmax = GROW(oldmax);
122 Renew(markstack, newmax, I32);
123 markstack_ptr = markstack + oldmax;
124 markstack_max = markstack + newmax;
131 savestack_max = GROW(savestack_max) + 4;
132 Renew(savestack, savestack_max, ANY);
141 /* XXX should tmps_floor live in cxstack? */
142 I32 myfloor = tmps_floor;
143 while (tmps_ix > myfloor) { /* clean up after last statement */
144 SV* sv = tmps_stack[tmps_ix];
145 tmps_stack[tmps_ix--] = Nullsv;
150 SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */
156 save_scalar_at(SV **sptr)
162 sv = *sptr = NEWSV(0,0);
163 if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
164 sv_upgrade(sv, SvTYPE(osv));
165 if (SvGMAGICAL(osv)) {
167 bool oldtainted = tainted;
169 if (tainting && tainted && (mg = mg_find(osv, 't'))) {
170 SAVESPTR(mg->mg_obj);
173 SvFLAGS(osv) |= (SvFLAGS(osv) &
174 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
175 tainted = oldtainted;
177 SvMAGIC(sv) = SvMAGIC(osv);
178 SvFLAGS(sv) |= SvMAGICAL(osv);
190 SV **sptr = &GvSV(gv);
192 SSPUSHPTR(SvREFCNT_inc(gv));
193 SSPUSHPTR(SvREFCNT_inc(*sptr));
195 return save_scalar_at(sptr);
199 save_svref(SV **sptr)
204 SSPUSHPTR(SvREFCNT_inc(*sptr));
205 SSPUSHINT(SAVEt_SVREF);
206 return save_scalar_at(sptr);
210 save_gp(GV *gv, I32 empty)
214 SSPUSHIV((IV)SvLEN(gv));
215 SvLEN(gv) = 0; /* forget that anything was allocated here */
216 SSPUSHIV((IV)SvCUR(gv));
217 SSPUSHPTR(SvPVX(gv));
219 SSPUSHPTR(SvREFCNT_inc(gv));
225 Newz(602, gp, 1, GP);
226 GvGP(gv) = gp_ref(gp);
227 GvSV(gv) = NEWSV(72,0);
228 GvLINE(gv) = curcop->cop_line;
244 if (!AvREAL(oav) && AvREIFY(oav))
251 GvAV(gv) = Null(AV*);
254 SvMAGIC(av) = SvMAGIC(oav);
255 SvFLAGS(av) |= SvMAGICAL(oav);
273 SSPUSHPTR(ohv = GvHVn(gv));
276 GvHV(gv) = Null(HV*);
279 SvMAGIC(hv) = SvMAGIC(ohv);
280 SvFLAGS(hv) |= SvMAGICAL(ohv);
291 save_item(register SV *item)
294 register SV *sv = NEWSV(0,0);
298 SSPUSHPTR(item); /* remember the pointer */
299 SSPUSHPTR(sv); /* remember the value */
300 SSPUSHINT(SAVEt_ITEM);
310 SSPUSHINT(SAVEt_INT);
314 save_long(long int *longp)
320 SSPUSHINT(SAVEt_LONG);
330 SSPUSHINT(SAVEt_I32);
340 SSPUSHINT(SAVEt_I16);
353 /* Cannot use save_sptr() to store a char* since the SV** cast will
354 * force word-alignment and we'll miss the pointer.
357 save_pptr(char **pptr)
363 SSPUSHINT(SAVEt_PPTR);
373 SSPUSHINT(SAVEt_SPTR);
377 save_threadsv(PADOFFSET i)
381 SV **svp = &THREADSV(i); /* XXX Change to save by offset */
382 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "save_threadsv %u: %p %p:%s\n",
383 i, svp, *svp, SvPEEK(*svp)));
387 croak("panic: save_threadsv called in non-threaded perl");
389 #endif /* USE_THREADS */
398 SSPUSHINT(SAVEt_NSTAB);
408 SSPUSHINT(SAVEt_HPTR);
418 SSPUSHINT(SAVEt_APTR);
427 SSPUSHINT(SAVEt_FREESV);
436 SSPUSHINT(SAVEt_FREEOP);
440 save_freepv(char *pv)
445 SSPUSHINT(SAVEt_FREEPV);
449 save_clearsv(SV **svp)
453 SSPUSHLONG((long)(svp-curpad));
454 SSPUSHINT(SAVEt_CLEARSV);
458 save_delete(HV *hv, char *key, I32 klen)
464 SSPUSHPTR(SvREFCNT_inc(hv));
465 SSPUSHINT(SAVEt_DELETE);
469 save_list(register SV **sarg, I32 maxsarg)
475 for (i = 1; i <= maxsarg; i++) {
477 sv_setsv(sv,sarg[i]);
479 SSPUSHPTR(sarg[i]); /* remember the pointer */
480 SSPUSHPTR(sv); /* remember the value */
481 SSPUSHINT(SAVEt_ITEM);
487 save_destructor(DESTRUCTORFUNC f, void* p)
489 save_destructor(void (*f) (void *), void *p)
496 SSPUSHINT(SAVEt_DESTRUCTOR);
500 save_aelem(AV *av, I32 idx, SV **sptr)
504 SSPUSHPTR(SvREFCNT_inc(av));
506 SSPUSHPTR(SvREFCNT_inc(*sptr));
507 SSPUSHINT(SAVEt_AELEM);
508 save_scalar_at(sptr);
512 save_helem(HV *hv, SV *key, SV **sptr)
516 SSPUSHPTR(SvREFCNT_inc(hv));
517 SSPUSHPTR(SvREFCNT_inc(key));
518 SSPUSHPTR(SvREFCNT_inc(*sptr));
519 SSPUSHINT(SAVEt_HELEM);
520 save_scalar_at(sptr);
533 leave_scope(I32 base)
545 croak("panic: corrupt saved stack index");
546 while (savestack_ix > base) {
548 case SAVEt_ITEM: /* normal string */
549 value = (SV*)SSPOPPTR;
551 sv_replace(sv,value);
556 case SAVEt_SV: /* scalar reference */
557 value = (SV*)SSPOPPTR;
562 case SAVEt_SVREF: /* scalar reference */
563 value = (SV*)SSPOPPTR;
567 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
568 "restore svref: %p %p:%s -> %p:%s\n",
569 ptr, sv, SvPEEK(sv), value, SvPEEK(value)));
570 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
571 SvTYPE(sv) != SVt_PVGV)
573 (void)SvUPGRADE(value, SvTYPE(sv));
574 SvMAGIC(value) = SvMAGIC(sv);
575 SvFLAGS(value) |= SvMAGICAL(sv);
579 else if (SvTYPE(value) >= SVt_PVMG && SvMAGIC(value) &&
580 SvTYPE(value) != SVt_PVGV)
582 SvFLAGS(value) |= (SvFLAGS(value) &
583 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
584 SvMAGICAL_off(value);
594 case SAVEt_AV: /* array reference */
598 AV *goner = GvAV(gv);
599 SvMAGIC(av) = SvMAGIC(goner);
600 SvFLAGS(av) |= SvMAGICAL(goner);
601 SvMAGICAL_off(goner);
612 case SAVEt_HV: /* hash reference */
616 HV *goner = GvHV(gv);
617 SvMAGIC(hv) = SvMAGIC(goner);
618 SvFLAGS(hv) |= SvMAGICAL(goner);
619 SvMAGICAL_off(goner);
630 case SAVEt_INT: /* int reference */
632 *(int*)ptr = (int)SSPOPINT;
634 case SAVEt_LONG: /* long reference */
636 *(long*)ptr = (long)SSPOPLONG;
638 case SAVEt_I32: /* I32 reference */
640 *(I32*)ptr = (I32)SSPOPINT;
642 case SAVEt_I16: /* I16 reference */
644 *(I16*)ptr = (I16)SSPOPINT;
646 case SAVEt_IV: /* IV reference */
648 *(IV*)ptr = (IV)SSPOPIV;
650 case SAVEt_SPTR: /* SV* reference */
652 *(SV**)ptr = (SV*)SSPOPPTR;
654 case SAVEt_PPTR: /* char* reference */
656 *(char**)ptr = (char*)SSPOPPTR;
658 case SAVEt_HPTR: /* HV* reference */
660 *(HV**)ptr = (HV*)SSPOPPTR;
662 case SAVEt_APTR: /* AV* reference */
664 *(AV**)ptr = (AV*)SSPOPPTR;
668 (void)sv_clear((SV*)gv);
670 case SAVEt_GP: /* scalar reference */
673 if (SvPOK(gv) && SvLEN(gv) > 0) {
676 SvPVX(gv) = (char *)SSPOPPTR;
677 SvCUR(gv) = (STRLEN)SSPOPIV;
678 SvLEN(gv) = (STRLEN)SSPOPIV;
685 SvREFCNT_dec((SV*)ptr);
690 curpad = AvARRAY(comppad);
695 Safefree((char*)ptr);
698 ptr = (void*)&curpad[SSPOPLONG];
700 /* Can clear pad variable in place? */
701 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
702 if (SvTHINKFIRST(sv)) {
704 croak("panic: leave_scope clearsv");
711 switch (SvTYPE(sv)) {
721 croak("panic: leave_scope pad code");
733 else { /* Someone has a claim on this, so abandon it. */
734 U32 padflags = SvFLAGS(sv) & (SVs_PADBUSY|SVs_PADMY|SVs_PADTMP);
735 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
736 case SVt_PVAV: *(SV**)ptr = (SV*)newAV(); break;
737 case SVt_PVHV: *(SV**)ptr = (SV*)newHV(); break;
738 default: *(SV**)ptr = NEWSV(0,0); break;
740 SvREFCNT_dec(sv); /* Cast current value to the winds. */
741 SvFLAGS(*(SV**)ptr) |= padflags; /* preserve pad nature */
748 (void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
752 case SAVEt_DESTRUCTOR:
754 (CALLDESTRUCTOR)(ptr);
756 case SAVEt_REGCONTEXT:
758 savestack_ix -= i; /* regexp must have croaked */
760 case SAVEt_STACK_POS: /* Position on Perl stack */
762 stack_sp = stack_base + i;
764 case SAVEt_AELEM: /* array element */
765 value = (SV*)SSPOPPTR;
768 ptr = av_fetch(av,i,1);
771 if (sv && sv != &sv_undef) {
772 if (SvRMAGICAL(av) && mg_find((SV*)av, 'P'))
773 (void)SvREFCNT_inc(sv);
781 case SAVEt_HELEM: /* hash element */
782 value = (SV*)SSPOPPTR;
785 ptr = hv_fetch_ent(hv, sv, 1, 0);
787 SV *oval = HeVAL((HE*)ptr);
788 if (oval && oval != &sv_undef) {
789 ptr = &HeVAL((HE*)ptr);
790 if (SvRMAGICAL(hv) && mg_find((SV*)hv, 'P'))
791 (void)SvREFCNT_inc(*(SV**)ptr);
805 croak("panic: leave_scope inconsistency");
813 cx_dump(PERL_CONTEXT *cx)
816 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), block_type[cx->cx_type]);
817 if (cx->cx_type != CXt_SUBST) {
818 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
819 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop);
820 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
821 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
822 PerlIO_printf(Perl_debug_log, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
823 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm);
824 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
826 switch (cx->cx_type) {
831 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%lx\n",
832 (long)cx->blk_sub.cv);
833 PerlIO_printf(Perl_debug_log, "BLK_SUB.GV = 0x%lx\n",
834 (long)cx->blk_sub.gv);
835 PerlIO_printf(Perl_debug_log, "BLK_SUB.DFOUTGV = 0x%lx\n",
836 (long)cx->blk_sub.dfoutgv);
837 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
838 (long)cx->blk_sub.olddepth);
839 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
840 (int)cx->blk_sub.hasargs);
843 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
844 (long)cx->blk_eval.old_in_eval);
845 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
846 op_name[cx->blk_eval.old_op_type],
847 op_desc[cx->blk_eval.old_op_type]);
848 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
849 cx->blk_eval.old_name);
850 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n",
851 (long)cx->blk_eval.old_eval_root);
855 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n",
857 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
858 (long)cx->blk_loop.resetsp);
859 PerlIO_printf(Perl_debug_log, "BLK_LOOP.REDO_OP = 0x%lx\n",
860 (long)cx->blk_loop.redo_op);
861 PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%lx\n",
862 (long)cx->blk_loop.next_op);
863 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LAST_OP = 0x%lx\n",
864 (long)cx->blk_loop.last_op);
865 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
866 (long)cx->blk_loop.iterix);
867 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%lx\n",
868 (long)cx->blk_loop.iterary);
869 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%lx\n",
870 (long)cx->blk_loop.itervar);
871 if (cx->blk_loop.itervar)
872 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%lx\n",
873 (long)cx->blk_loop.itersave);
874 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERLVAL = 0x%lx\n",
875 (long)cx->blk_loop.iterlval);
879 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
881 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
882 (long)cx->sb_maxiters);
883 PerlIO_printf(Perl_debug_log, "SB_SAFEBASE = %ld\n",
884 (long)cx->sb_safebase);
885 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
887 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
889 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%lx\n",
891 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%lx\n",
893 PerlIO_printf(Perl_debug_log, "SB_S = 0x%lx\n",
895 PerlIO_printf(Perl_debug_log, "SB_M = 0x%lx\n",
897 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%lx\n",
898 (long)cx->sb_strend);
899 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%lx\n",