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)
23 av_extend(curstack, (p - stack_base) + (n) + 128);
31 cxstack_max = cxstack_max * 3 / 2;
32 Renew(cxstack, cxstack_max + 1, PERL_CONTEXT); /* XXX should fix CXINC macro */
33 return cxstack_ix + 1;
37 push_return(OP *retop)
40 if (retstack_ix == retstack_max) {
41 retstack_max = retstack_max * 3 / 2;
42 Renew(retstack, retstack_max, OP*);
44 retstack[retstack_ix++] = retop;
52 return retstack[--retstack_ix];
61 if (scopestack_ix == scopestack_max) {
62 scopestack_max = scopestack_max * 3 / 2;
63 Renew(scopestack, scopestack_max, I32);
65 scopestack[scopestack_ix++] = savestack_ix;
73 I32 oldsave = scopestack[--scopestack_ix];
81 I32 oldmax = markstack_max - markstack;
82 I32 newmax = oldmax * 3 / 2;
84 Renew(markstack, newmax, I32);
85 markstack_ptr = markstack + oldmax;
86 markstack_max = markstack + newmax;
93 savestack_max = savestack_max * 3 / 2;
94 Renew(savestack, savestack_max, ANY);
101 /* XXX should tmps_floor live in cxstack? */
102 I32 myfloor = tmps_floor;
103 while (tmps_ix > myfloor) { /* clean up after last statement */
104 SV* sv = tmps_stack[tmps_ix];
105 tmps_stack[tmps_ix--] = Nullsv;
110 SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */
116 save_scalar_at(SV **sptr)
122 sv = *sptr = NEWSV(0,0);
123 if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
124 sv_upgrade(sv, SvTYPE(osv));
125 if (SvGMAGICAL(osv)) {
127 bool oldtainted = tainted;
129 if (tainting && tainted && (mg = mg_find(osv, 't'))) {
130 SAVESPTR(mg->mg_obj);
133 SvFLAGS(osv) |= (SvFLAGS(osv) &
134 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
135 tainted = oldtainted;
137 SvMAGIC(sv) = SvMAGIC(osv);
138 SvFLAGS(sv) |= SvMAGICAL(osv);
154 return save_scalar_at(&GvSV(gv));
158 save_svref(SV **sptr)
164 SSPUSHINT(SAVEt_SVREF);
165 return save_scalar_at(sptr);
169 save_gp(GV *gv, I32 empty)
173 SSPUSHIV((IV)SvLEN(gv));
174 SvLEN(gv) = 0; /* forget that anything was allocated here */
175 SSPUSHIV((IV)SvCUR(gv));
176 SSPUSHPTR(SvPVX(gv));
178 SSPUSHPTR(SvREFCNT_inc(gv));
184 Newz(602, gp, 1, GP);
185 GvGP(gv) = gp_ref(gp);
186 GvSV(gv) = NEWSV(72,0);
187 GvLINE(gv) = curcop->cop_line;
204 SSPUSHPTR(oav = GvAVn(gv));
207 GvAV(gv) = Null(AV*);
210 SvMAGIC(av) = SvMAGIC(oav);
211 SvFLAGS(av) |= SvMAGICAL(oav);
229 SSPUSHPTR(ohv = GvHVn(gv));
232 GvHV(gv) = Null(HV*);
235 SvMAGIC(hv) = SvMAGIC(ohv);
236 SvFLAGS(hv) |= SvMAGICAL(ohv);
247 save_item(register SV *item)
253 SSPUSHPTR(item); /* remember the pointer */
256 SSPUSHPTR(sv); /* remember the value */
257 SSPUSHINT(SAVEt_ITEM);
267 SSPUSHINT(SAVEt_INT);
271 save_long(long int *longp)
277 SSPUSHINT(SAVEt_LONG);
287 SSPUSHINT(SAVEt_I32);
297 SSPUSHINT(SAVEt_I16);
310 /* Cannot use save_sptr() to store a char* since the SV** cast will
311 * force word-alignment and we'll miss the pointer.
314 save_pptr(char **pptr)
320 SSPUSHINT(SAVEt_PPTR);
330 SSPUSHINT(SAVEt_SPTR);
339 SSPUSHINT(SAVEt_NSTAB);
349 SSPUSHINT(SAVEt_HPTR);
359 SSPUSHINT(SAVEt_APTR);
368 SSPUSHINT(SAVEt_FREESV);
377 SSPUSHINT(SAVEt_FREEOP);
381 save_freepv(char *pv)
386 SSPUSHINT(SAVEt_FREEPV);
390 save_clearsv(SV **svp)
394 SSPUSHLONG((long)(svp-curpad));
395 SSPUSHINT(SAVEt_CLEARSV);
399 save_delete(HV *hv, char *key, I32 klen)
406 SSPUSHINT(SAVEt_DELETE);
410 save_list(register SV **sarg, I32 maxsarg)
416 SSCHECK(3 * maxsarg);
417 for (i = 1; i <= maxsarg; i++) {
418 SSPUSHPTR(sarg[i]); /* remember the pointer */
420 sv_setsv(sv,sarg[i]);
421 SSPUSHPTR(sv); /* remember the value */
422 SSPUSHINT(SAVEt_ITEM);
427 save_destructor(void (*f) (void *), void *p)
433 SSPUSHINT(SAVEt_DESTRUCTOR);
446 leave_scope(I32 base)
457 croak("panic: corrupt saved stack index");
458 while (savestack_ix > base) {
460 case SAVEt_ITEM: /* normal string */
461 value = (SV*)SSPOPPTR;
463 sv_replace(sv,value);
468 case SAVEt_SV: /* scalar reference */
469 value = (SV*)SSPOPPTR;
473 case SAVEt_SVREF: /* scalar reference */
474 value = (SV*)SSPOPPTR;
478 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
479 SvTYPE(sv) != SVt_PVGV)
481 (void)SvUPGRADE(value, SvTYPE(sv));
482 SvMAGIC(value) = SvMAGIC(sv);
483 SvFLAGS(value) |= SvMAGICAL(sv);
487 else if (SvTYPE(value) >= SVt_PVMG && SvMAGIC(value) &&
488 SvTYPE(value) != SVt_PVGV)
490 SvFLAGS(value) |= (SvFLAGS(value) &
491 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
492 SvMAGICAL_off(value);
501 case SAVEt_AV: /* array reference */
505 AV *goner = GvAV(gv);
506 SvMAGIC(av) = SvMAGIC(goner);
507 SvFLAGS(av) |= SvMAGICAL(goner);
508 SvMAGICAL_off(goner);
519 case SAVEt_HV: /* hash reference */
523 HV *goner = GvHV(gv);
524 SvMAGIC(hv) = SvMAGIC(goner);
525 SvFLAGS(hv) |= SvMAGICAL(goner);
526 SvMAGICAL_off(goner);
537 case SAVEt_INT: /* int reference */
539 *(int*)ptr = (int)SSPOPINT;
541 case SAVEt_LONG: /* long reference */
543 *(long*)ptr = (long)SSPOPLONG;
545 case SAVEt_I32: /* I32 reference */
547 *(I32*)ptr = (I32)SSPOPINT;
549 case SAVEt_I16: /* I16 reference */
551 *(I16*)ptr = (I16)SSPOPINT;
553 case SAVEt_IV: /* IV reference */
555 *(IV*)ptr = (IV)SSPOPIV;
557 case SAVEt_SPTR: /* SV* reference */
559 *(SV**)ptr = (SV*)SSPOPPTR;
561 case SAVEt_PPTR: /* char* reference */
563 *(char**)ptr = (char*)SSPOPPTR;
565 case SAVEt_HPTR: /* HV* reference */
567 *(HV**)ptr = (HV*)SSPOPPTR;
569 case SAVEt_APTR: /* AV* reference */
571 *(AV**)ptr = (AV*)SSPOPPTR;
575 (void)sv_clear((SV*)gv);
577 case SAVEt_GP: /* scalar reference */
582 if (SvPOK(gv) && SvLEN(gv) > 0) {
585 SvPVX(gv) = (char *)SSPOPPTR;
586 SvCUR(gv) = (STRLEN)SSPOPIV;
587 SvLEN(gv) = (STRLEN)SSPOPIV;
592 SvREFCNT_dec((SV*)ptr);
597 curpad = AvARRAY(comppad);
602 Safefree((char*)ptr);
605 ptr = (void*)&curpad[SSPOPLONG];
607 /* Can clear pad variable in place? */
608 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
609 if (SvTHINKFIRST(sv)) {
611 croak("panic: leave_scope clearsv");
618 switch (SvTYPE(sv)) {
628 croak("panic: leave_scope pad code");
640 else { /* Someone has a claim on this, so abandon it. */
641 U32 padflags = SvFLAGS(sv) & (SVs_PADBUSY|SVs_PADMY|SVs_PADTMP);
642 SvREFCNT_dec(sv); /* Cast current value to the winds. */
643 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
644 case SVt_PVAV: *(SV**)ptr = (SV*)newAV(); break;
645 case SVt_PVHV: *(SV**)ptr = (SV*)newHV(); break;
646 default: *(SV**)ptr = NEWSV(0,0); break;
648 SvFLAGS(*(SV**)ptr) |= padflags; /* preserve pad nature */
655 (void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
658 case SAVEt_DESTRUCTOR:
662 case SAVEt_REGCONTEXT:
664 I32 delta = SSPOPINT;
665 savestack_ix -= delta; /* regexp must have croaked */
668 case SAVEt_STACK_POS: /* Position on Perl stack */
670 I32 delta = SSPOPINT;
671 stack_sp = stack_base + delta;
678 croak("panic: leave_scope inconsistency");
686 cx_dump(PERL_CONTEXT *cx)
689 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), block_type[cx->cx_type]);
690 if (cx->cx_type != CXt_SUBST) {
691 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
692 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop);
693 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
694 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
695 PerlIO_printf(Perl_debug_log, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
696 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm);
697 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
699 switch (cx->cx_type) {
704 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%lx\n",
705 (long)cx->blk_sub.cv);
706 PerlIO_printf(Perl_debug_log, "BLK_SUB.GV = 0x%lx\n",
707 (long)cx->blk_sub.gv);
708 PerlIO_printf(Perl_debug_log, "BLK_SUB.DFOUTGV = 0x%lx\n",
709 (long)cx->blk_sub.dfoutgv);
710 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
711 (long)cx->blk_sub.olddepth);
712 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
713 (int)cx->blk_sub.hasargs);
716 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
717 (long)cx->blk_eval.old_in_eval);
718 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
719 op_name[cx->blk_eval.old_op_type],
720 op_desc[cx->blk_eval.old_op_type]);
721 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
722 cx->blk_eval.old_name);
723 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n",
724 (long)cx->blk_eval.old_eval_root);
728 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n",
730 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
731 (long)cx->blk_loop.resetsp);
732 PerlIO_printf(Perl_debug_log, "BLK_LOOP.REDO_OP = 0x%lx\n",
733 (long)cx->blk_loop.redo_op);
734 PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%lx\n",
735 (long)cx->blk_loop.next_op);
736 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LAST_OP = 0x%lx\n",
737 (long)cx->blk_loop.last_op);
738 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
739 (long)cx->blk_loop.iterix);
740 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%lx\n",
741 (long)cx->blk_loop.iterary);
742 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%lx\n",
743 (long)cx->blk_loop.itervar);
744 if (cx->blk_loop.itervar)
745 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%lx\n",
746 (long)cx->blk_loop.itersave);
747 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERLVAL = 0x%lx\n",
748 (long)cx->blk_loop.iterlval);
752 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
754 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
755 (long)cx->sb_maxiters);
756 PerlIO_printf(Perl_debug_log, "SB_SAFEBASE = %ld\n",
757 (long)cx->sb_safebase);
758 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
760 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
762 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%lx\n",
764 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%lx\n",
766 PerlIO_printf(Perl_debug_log, "SB_S = 0x%lx\n",
768 PerlIO_printf(Perl_debug_log, "SB_M = 0x%lx\n",
770 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%lx\n",
771 (long)cx->sb_strend);
772 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%lx\n",