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 av_extend(curstack, (p - stack_base) + (n) + 128);
29 #if defined(DEBUGGING) && !defined(USE_THREADS)
39 cxstack_max = cxstack_max * 3 / 2;
40 Renew(cxstack, cxstack_max + 1, PERL_CONTEXT); /* XXX should fix CXINC macro */
41 return cxstack_ix + 1;
45 push_return(OP *retop)
48 if (retstack_ix == retstack_max) {
49 retstack_max = retstack_max * 3 / 2;
50 Renew(retstack, retstack_max, OP*);
52 retstack[retstack_ix++] = retop;
60 return retstack[--retstack_ix];
69 if (scopestack_ix == scopestack_max) {
70 scopestack_max = scopestack_max * 3 / 2;
71 Renew(scopestack, scopestack_max, I32);
73 scopestack[scopestack_ix++] = savestack_ix;
81 I32 oldsave = scopestack[--scopestack_ix];
89 I32 oldmax = markstack_max - markstack;
90 I32 newmax = oldmax * 3 / 2;
92 Renew(markstack, newmax, I32);
93 markstack_ptr = markstack + oldmax;
94 markstack_max = markstack + newmax;
101 savestack_max = savestack_max * 3 / 2;
102 Renew(savestack, savestack_max, ANY);
109 /* XXX should tmps_floor live in cxstack? */
110 I32 myfloor = tmps_floor;
111 while (tmps_ix > myfloor) { /* clean up after last statement */
112 SV* sv = tmps_stack[tmps_ix];
113 tmps_stack[tmps_ix--] = Nullsv;
118 SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */
124 save_scalar_at(SV **sptr)
130 sv = *sptr = NEWSV(0,0);
131 if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
132 sv_upgrade(sv, SvTYPE(osv));
133 if (SvGMAGICAL(osv)) {
135 bool oldtainted = tainted;
137 if (tainting && tainted && (mg = mg_find(osv, 't'))) {
138 SAVESPTR(mg->mg_obj);
141 SvFLAGS(osv) |= (SvFLAGS(osv) &
142 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
143 tainted = oldtainted;
145 SvMAGIC(sv) = SvMAGIC(osv);
146 SvFLAGS(sv) |= SvMAGICAL(osv);
158 SV **sptr = &GvSV(gv);
160 SSPUSHPTR(SvREFCNT_inc(gv));
161 SSPUSHPTR(SvREFCNT_inc(*sptr));
163 return save_scalar_at(sptr);
167 save_svref(SV **sptr)
172 SSPUSHPTR(SvREFCNT_inc(*sptr));
173 SSPUSHINT(SAVEt_SVREF);
174 return save_scalar_at(sptr);
178 save_gp(GV *gv, I32 empty)
182 SSPUSHIV((IV)SvLEN(gv));
183 SvLEN(gv) = 0; /* forget that anything was allocated here */
184 SSPUSHIV((IV)SvCUR(gv));
185 SSPUSHPTR(SvPVX(gv));
187 SSPUSHPTR(SvREFCNT_inc(gv));
193 Newz(602, gp, 1, GP);
194 GvGP(gv) = gp_ref(gp);
195 GvSV(gv) = NEWSV(72,0);
196 GvLINE(gv) = curcop->cop_line;
212 if (!AvREAL(oav) && AvREIFY(oav))
219 GvAV(gv) = Null(AV*);
222 SvMAGIC(av) = SvMAGIC(oav);
223 SvFLAGS(av) |= SvMAGICAL(oav);
241 SSPUSHPTR(ohv = GvHVn(gv));
244 GvHV(gv) = Null(HV*);
247 SvMAGIC(hv) = SvMAGIC(ohv);
248 SvFLAGS(hv) |= SvMAGICAL(ohv);
259 save_item(register SV *item)
262 register SV *sv = NEWSV(0,0);
266 SSPUSHPTR(item); /* remember the pointer */
267 SSPUSHPTR(sv); /* remember the value */
268 SSPUSHINT(SAVEt_ITEM);
278 SSPUSHINT(SAVEt_INT);
282 save_long(long int *longp)
288 SSPUSHINT(SAVEt_LONG);
298 SSPUSHINT(SAVEt_I32);
308 SSPUSHINT(SAVEt_I16);
321 /* Cannot use save_sptr() to store a char* since the SV** cast will
322 * force word-alignment and we'll miss the pointer.
325 save_pptr(char **pptr)
331 SSPUSHINT(SAVEt_PPTR);
341 SSPUSHINT(SAVEt_SPTR);
345 save_threadsv(PADOFFSET i)
349 SV **svp = &THREADSV(i); /* XXX Change to save by offset */
350 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "save_threadsv %u: %p %p:%s\n",
351 i, svp, *svp, SvPEEK(*svp)));
355 croak("panic: save_threadsv called in non-threaded perl");
357 #endif /* USE_THREADS */
366 SSPUSHINT(SAVEt_NSTAB);
376 SSPUSHINT(SAVEt_HPTR);
386 SSPUSHINT(SAVEt_APTR);
395 SSPUSHINT(SAVEt_FREESV);
404 SSPUSHINT(SAVEt_FREEOP);
408 save_freepv(char *pv)
413 SSPUSHINT(SAVEt_FREEPV);
417 save_clearsv(SV **svp)
421 SSPUSHLONG((long)(svp-curpad));
422 SSPUSHINT(SAVEt_CLEARSV);
426 save_delete(HV *hv, char *key, I32 klen)
432 SSPUSHPTR(SvREFCNT_inc(hv));
433 SSPUSHINT(SAVEt_DELETE);
437 save_list(register SV **sarg, I32 maxsarg)
443 for (i = 1; i <= maxsarg; i++) {
445 sv_setsv(sv,sarg[i]);
447 SSPUSHPTR(sarg[i]); /* remember the pointer */
448 SSPUSHPTR(sv); /* remember the value */
449 SSPUSHINT(SAVEt_ITEM);
454 save_destructor(void (*f) (void *), void *p)
460 SSPUSHINT(SAVEt_DESTRUCTOR);
464 save_aelem(AV *av, I32 idx, SV **sptr)
468 SSPUSHPTR(SvREFCNT_inc(av));
470 SSPUSHPTR(SvREFCNT_inc(*sptr));
471 SSPUSHINT(SAVEt_AELEM);
472 save_scalar_at(sptr);
476 save_helem(HV *hv, SV *key, SV **sptr)
480 SSPUSHPTR(SvREFCNT_inc(hv));
481 SSPUSHPTR(SvREFCNT_inc(key));
482 SSPUSHPTR(SvREFCNT_inc(*sptr));
483 SSPUSHINT(SAVEt_HELEM);
484 save_scalar_at(sptr);
497 leave_scope(I32 base)
509 croak("panic: corrupt saved stack index");
510 while (savestack_ix > base) {
512 case SAVEt_ITEM: /* normal string */
513 value = (SV*)SSPOPPTR;
515 sv_replace(sv,value);
520 case SAVEt_SV: /* scalar reference */
521 value = (SV*)SSPOPPTR;
526 case SAVEt_SVREF: /* scalar reference */
527 value = (SV*)SSPOPPTR;
531 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
532 "restore svref: %p %p:%s -> %p:%s\n",
533 ptr, sv, SvPEEK(sv), value, SvPEEK(value)));
534 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
535 SvTYPE(sv) != SVt_PVGV)
537 (void)SvUPGRADE(value, SvTYPE(sv));
538 SvMAGIC(value) = SvMAGIC(sv);
539 SvFLAGS(value) |= SvMAGICAL(sv);
543 else if (SvTYPE(value) >= SVt_PVMG && SvMAGIC(value) &&
544 SvTYPE(value) != SVt_PVGV)
546 SvFLAGS(value) |= (SvFLAGS(value) &
547 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
548 SvMAGICAL_off(value);
558 case SAVEt_AV: /* array reference */
562 AV *goner = GvAV(gv);
563 SvMAGIC(av) = SvMAGIC(goner);
564 SvFLAGS(av) |= SvMAGICAL(goner);
565 SvMAGICAL_off(goner);
576 case SAVEt_HV: /* hash reference */
580 HV *goner = GvHV(gv);
581 SvMAGIC(hv) = SvMAGIC(goner);
582 SvFLAGS(hv) |= SvMAGICAL(goner);
583 SvMAGICAL_off(goner);
594 case SAVEt_INT: /* int reference */
596 *(int*)ptr = (int)SSPOPINT;
598 case SAVEt_LONG: /* long reference */
600 *(long*)ptr = (long)SSPOPLONG;
602 case SAVEt_I32: /* I32 reference */
604 *(I32*)ptr = (I32)SSPOPINT;
606 case SAVEt_I16: /* I16 reference */
608 *(I16*)ptr = (I16)SSPOPINT;
610 case SAVEt_IV: /* IV reference */
612 *(IV*)ptr = (IV)SSPOPIV;
614 case SAVEt_SPTR: /* SV* reference */
616 *(SV**)ptr = (SV*)SSPOPPTR;
618 case SAVEt_PPTR: /* char* reference */
620 *(char**)ptr = (char*)SSPOPPTR;
622 case SAVEt_HPTR: /* HV* reference */
624 *(HV**)ptr = (HV*)SSPOPPTR;
626 case SAVEt_APTR: /* AV* reference */
628 *(AV**)ptr = (AV*)SSPOPPTR;
632 (void)sv_clear((SV*)gv);
634 case SAVEt_GP: /* scalar reference */
637 if (SvPOK(gv) && SvLEN(gv) > 0) {
640 SvPVX(gv) = (char *)SSPOPPTR;
641 SvCUR(gv) = (STRLEN)SSPOPIV;
642 SvLEN(gv) = (STRLEN)SSPOPIV;
649 SvREFCNT_dec((SV*)ptr);
654 curpad = AvARRAY(comppad);
659 Safefree((char*)ptr);
662 ptr = (void*)&curpad[SSPOPLONG];
664 /* Can clear pad variable in place? */
665 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
666 if (SvTHINKFIRST(sv)) {
668 croak("panic: leave_scope clearsv");
675 switch (SvTYPE(sv)) {
685 croak("panic: leave_scope pad code");
697 else { /* Someone has a claim on this, so abandon it. */
698 U32 padflags = SvFLAGS(sv) & (SVs_PADBUSY|SVs_PADMY|SVs_PADTMP);
699 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
700 case SVt_PVAV: *(SV**)ptr = (SV*)newAV(); break;
701 case SVt_PVHV: *(SV**)ptr = (SV*)newHV(); break;
702 default: *(SV**)ptr = NEWSV(0,0); break;
704 SvREFCNT_dec(sv); /* Cast current value to the winds. */
705 SvFLAGS(*(SV**)ptr) |= padflags; /* preserve pad nature */
712 (void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
716 case SAVEt_DESTRUCTOR:
720 case SAVEt_REGCONTEXT:
722 savestack_ix -= i; /* regexp must have croaked */
724 case SAVEt_STACK_POS: /* Position on Perl stack */
726 stack_sp = stack_base + i;
728 case SAVEt_AELEM: /* array element */
729 value = (SV*)SSPOPPTR;
732 ptr = av_fetch(av,i,1);
735 if (sv && sv != &sv_undef) {
736 if (SvRMAGICAL(av) && mg_find((SV*)av, 'P'))
737 (void)SvREFCNT_inc(sv);
745 case SAVEt_HELEM: /* hash element */
746 value = (SV*)SSPOPPTR;
749 ptr = hv_fetch_ent(hv, sv, 1, 0);
751 SV *oval = HeVAL((HE*)ptr);
752 if (oval && oval != &sv_undef) {
753 ptr = &HeVAL((HE*)ptr);
754 if (SvRMAGICAL(hv) && mg_find((SV*)hv, 'P'))
755 (void)SvREFCNT_inc(*(SV**)ptr);
769 croak("panic: leave_scope inconsistency");
777 cx_dump(PERL_CONTEXT *cx)
780 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), block_type[cx->cx_type]);
781 if (cx->cx_type != CXt_SUBST) {
782 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
783 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop);
784 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
785 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
786 PerlIO_printf(Perl_debug_log, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
787 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm);
788 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
790 switch (cx->cx_type) {
795 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%lx\n",
796 (long)cx->blk_sub.cv);
797 PerlIO_printf(Perl_debug_log, "BLK_SUB.GV = 0x%lx\n",
798 (long)cx->blk_sub.gv);
799 PerlIO_printf(Perl_debug_log, "BLK_SUB.DFOUTGV = 0x%lx\n",
800 (long)cx->blk_sub.dfoutgv);
801 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
802 (long)cx->blk_sub.olddepth);
803 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
804 (int)cx->blk_sub.hasargs);
807 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
808 (long)cx->blk_eval.old_in_eval);
809 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
810 op_name[cx->blk_eval.old_op_type],
811 op_desc[cx->blk_eval.old_op_type]);
812 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
813 cx->blk_eval.old_name);
814 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n",
815 (long)cx->blk_eval.old_eval_root);
819 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n",
821 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
822 (long)cx->blk_loop.resetsp);
823 PerlIO_printf(Perl_debug_log, "BLK_LOOP.REDO_OP = 0x%lx\n",
824 (long)cx->blk_loop.redo_op);
825 PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%lx\n",
826 (long)cx->blk_loop.next_op);
827 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LAST_OP = 0x%lx\n",
828 (long)cx->blk_loop.last_op);
829 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
830 (long)cx->blk_loop.iterix);
831 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%lx\n",
832 (long)cx->blk_loop.iterary);
833 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%lx\n",
834 (long)cx->blk_loop.itervar);
835 if (cx->blk_loop.itervar)
836 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%lx\n",
837 (long)cx->blk_loop.itersave);
838 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERLVAL = 0x%lx\n",
839 (long)cx->blk_loop.iterlval);
843 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
845 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
846 (long)cx->sb_maxiters);
847 PerlIO_printf(Perl_debug_log, "SB_SAFEBASE = %ld\n",
848 (long)cx->sb_safebase);
849 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
851 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
853 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%lx\n",
855 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%lx\n",
857 PerlIO_printf(Perl_debug_log, "SB_S = 0x%lx\n",
859 PerlIO_printf(Perl_debug_log, "SB_M = 0x%lx\n",
861 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%lx\n",
862 (long)cx->sb_strend);
863 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%lx\n",