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);
162 return save_scalar_at(&GvSV(gv));
166 save_svref(SV **sptr)
172 SSPUSHINT(SAVEt_SVREF);
173 return save_scalar_at(sptr);
177 save_gp(GV *gv, I32 empty)
181 SSPUSHIV((IV)SvLEN(gv));
182 SvLEN(gv) = 0; /* forget that anything was allocated here */
183 SSPUSHIV((IV)SvCUR(gv));
184 SSPUSHPTR(SvPVX(gv));
186 SSPUSHPTR(SvREFCNT_inc(gv));
192 Newz(602, gp, 1, GP);
193 GvGP(gv) = gp_ref(gp);
194 GvSV(gv) = NEWSV(72,0);
195 GvLINE(gv) = curcop->cop_line;
211 if (!AvREAL(oav) && AvREIFY(oav))
218 GvAV(gv) = Null(AV*);
221 SvMAGIC(av) = SvMAGIC(oav);
222 SvFLAGS(av) |= SvMAGICAL(oav);
240 SSPUSHPTR(ohv = GvHVn(gv));
243 GvHV(gv) = Null(HV*);
246 SvMAGIC(hv) = SvMAGIC(ohv);
247 SvFLAGS(hv) |= SvMAGICAL(ohv);
258 save_item(register SV *item)
264 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 = av_fetch(thr->threadsv, i, FALSE);
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)
433 SSPUSHINT(SAVEt_DELETE);
437 save_list(register SV **sarg, I32 maxsarg)
443 SSCHECK(3 * maxsarg);
444 for (i = 1; i <= maxsarg; i++) {
445 SSPUSHPTR(sarg[i]); /* remember the pointer */
447 sv_setsv(sv,sarg[i]);
448 SSPUSHPTR(sv); /* remember the value */
449 SSPUSHINT(SAVEt_ITEM);
454 save_destructor(void (*f) (void *), void *p)
460 SSPUSHINT(SAVEt_DESTRUCTOR);
473 leave_scope(I32 base)
484 croak("panic: corrupt saved stack index");
485 while (savestack_ix > base) {
487 case SAVEt_ITEM: /* normal string */
488 value = (SV*)SSPOPPTR;
490 sv_replace(sv,value);
495 case SAVEt_SV: /* scalar reference */
496 value = (SV*)SSPOPPTR;
500 case SAVEt_SVREF: /* scalar reference */
501 value = (SV*)SSPOPPTR;
505 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
506 "restore svref: %p %p:%s -> %p:%s\n",
507 ptr, sv, SvPEEK(sv), value, SvPEEK(value)));
508 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
509 SvTYPE(sv) != SVt_PVGV)
511 (void)SvUPGRADE(value, SvTYPE(sv));
512 SvMAGIC(value) = SvMAGIC(sv);
513 SvFLAGS(value) |= SvMAGICAL(sv);
517 else if (SvTYPE(value) >= SVt_PVMG && SvMAGIC(value) &&
518 SvTYPE(value) != SVt_PVGV)
520 SvFLAGS(value) |= (SvFLAGS(value) &
521 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
522 SvMAGICAL_off(value);
531 case SAVEt_AV: /* array reference */
535 AV *goner = GvAV(gv);
536 SvMAGIC(av) = SvMAGIC(goner);
537 SvFLAGS(av) |= SvMAGICAL(goner);
538 SvMAGICAL_off(goner);
549 case SAVEt_HV: /* hash reference */
553 HV *goner = GvHV(gv);
554 SvMAGIC(hv) = SvMAGIC(goner);
555 SvFLAGS(hv) |= SvMAGICAL(goner);
556 SvMAGICAL_off(goner);
567 case SAVEt_INT: /* int reference */
569 *(int*)ptr = (int)SSPOPINT;
571 case SAVEt_LONG: /* long reference */
573 *(long*)ptr = (long)SSPOPLONG;
575 case SAVEt_I32: /* I32 reference */
577 *(I32*)ptr = (I32)SSPOPINT;
579 case SAVEt_I16: /* I16 reference */
581 *(I16*)ptr = (I16)SSPOPINT;
583 case SAVEt_IV: /* IV reference */
585 *(IV*)ptr = (IV)SSPOPIV;
587 case SAVEt_SPTR: /* SV* reference */
589 *(SV**)ptr = (SV*)SSPOPPTR;
591 case SAVEt_PPTR: /* char* reference */
593 *(char**)ptr = (char*)SSPOPPTR;
595 case SAVEt_HPTR: /* HV* reference */
597 *(HV**)ptr = (HV*)SSPOPPTR;
599 case SAVEt_APTR: /* AV* reference */
601 *(AV**)ptr = (AV*)SSPOPPTR;
605 (void)sv_clear((SV*)gv);
607 case SAVEt_GP: /* scalar reference */
612 if (SvPOK(gv) && SvLEN(gv) > 0) {
615 SvPVX(gv) = (char *)SSPOPPTR;
616 SvCUR(gv) = (STRLEN)SSPOPIV;
617 SvLEN(gv) = (STRLEN)SSPOPIV;
622 SvREFCNT_dec((SV*)ptr);
627 curpad = AvARRAY(comppad);
632 Safefree((char*)ptr);
635 ptr = (void*)&curpad[SSPOPLONG];
637 /* Can clear pad variable in place? */
638 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
639 if (SvTHINKFIRST(sv)) {
641 croak("panic: leave_scope clearsv");
648 switch (SvTYPE(sv)) {
658 croak("panic: leave_scope pad code");
670 else { /* Someone has a claim on this, so abandon it. */
671 U32 padflags = SvFLAGS(sv) & (SVs_PADBUSY|SVs_PADMY|SVs_PADTMP);
672 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
673 case SVt_PVAV: *(SV**)ptr = (SV*)newAV(); break;
674 case SVt_PVHV: *(SV**)ptr = (SV*)newHV(); break;
675 default: *(SV**)ptr = NEWSV(0,0); break;
677 SvREFCNT_dec(sv); /* Cast current value to the winds. */
678 SvFLAGS(*(SV**)ptr) |= padflags; /* preserve pad nature */
685 (void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
688 case SAVEt_DESTRUCTOR:
692 case SAVEt_REGCONTEXT:
694 I32 delta = SSPOPINT;
695 savestack_ix -= delta; /* regexp must have croaked */
698 case SAVEt_STACK_POS: /* Position on Perl stack */
700 I32 delta = SSPOPINT;
701 stack_sp = stack_base + delta;
708 croak("panic: leave_scope inconsistency");
716 cx_dump(PERL_CONTEXT *cx)
719 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), block_type[cx->cx_type]);
720 if (cx->cx_type != CXt_SUBST) {
721 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
722 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop);
723 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
724 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
725 PerlIO_printf(Perl_debug_log, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
726 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm);
727 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
729 switch (cx->cx_type) {
734 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%lx\n",
735 (long)cx->blk_sub.cv);
736 PerlIO_printf(Perl_debug_log, "BLK_SUB.GV = 0x%lx\n",
737 (long)cx->blk_sub.gv);
738 PerlIO_printf(Perl_debug_log, "BLK_SUB.DFOUTGV = 0x%lx\n",
739 (long)cx->blk_sub.dfoutgv);
740 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
741 (long)cx->blk_sub.olddepth);
742 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
743 (int)cx->blk_sub.hasargs);
746 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
747 (long)cx->blk_eval.old_in_eval);
748 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
749 op_name[cx->blk_eval.old_op_type],
750 op_desc[cx->blk_eval.old_op_type]);
751 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
752 cx->blk_eval.old_name);
753 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n",
754 (long)cx->blk_eval.old_eval_root);
758 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n",
760 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
761 (long)cx->blk_loop.resetsp);
762 PerlIO_printf(Perl_debug_log, "BLK_LOOP.REDO_OP = 0x%lx\n",
763 (long)cx->blk_loop.redo_op);
764 PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%lx\n",
765 (long)cx->blk_loop.next_op);
766 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LAST_OP = 0x%lx\n",
767 (long)cx->blk_loop.last_op);
768 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
769 (long)cx->blk_loop.iterix);
770 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%lx\n",
771 (long)cx->blk_loop.iterary);
772 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%lx\n",
773 (long)cx->blk_loop.itervar);
774 if (cx->blk_loop.itervar)
775 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%lx\n",
776 (long)cx->blk_loop.itersave);
777 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERLVAL = 0x%lx\n",
778 (long)cx->blk_loop.iterlval);
782 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
784 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
785 (long)cx->sb_maxiters);
786 PerlIO_printf(Perl_debug_log, "SB_SAFEBASE = %ld\n",
787 (long)cx->sb_safebase);
788 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
790 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
792 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%lx\n",
794 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%lx\n",
796 PerlIO_printf(Perl_debug_log, "SB_S = 0x%lx\n",
798 PerlIO_printf(Perl_debug_log, "SB_M = 0x%lx\n",
800 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%lx\n",
801 (long)cx->sb_strend);
802 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%lx\n",