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)
49 cxstack_max = GROW(cxstack_max);
50 Renew(cxstack, cxstack_max + 1, PERL_CONTEXT); /* XXX should fix CXINC macro */
51 return cxstack_ix + 1;
55 push_return(OP *retop)
58 if (retstack_ix == retstack_max) {
59 retstack_max = GROW(retstack_max);
60 Renew(retstack, retstack_max, OP*);
62 retstack[retstack_ix++] = retop;
70 return retstack[--retstack_ix];
79 if (scopestack_ix == scopestack_max) {
80 scopestack_max = GROW(scopestack_max);
81 Renew(scopestack, scopestack_max, I32);
83 scopestack[scopestack_ix++] = savestack_ix;
91 I32 oldsave = scopestack[--scopestack_ix];
99 I32 oldmax = markstack_max - markstack;
100 I32 newmax = GROW(oldmax);
102 Renew(markstack, newmax, I32);
103 markstack_ptr = markstack + oldmax;
104 markstack_max = markstack + newmax;
111 savestack_max = GROW(savestack_max) + 4;
112 Renew(savestack, savestack_max, ANY);
121 /* XXX should tmps_floor live in cxstack? */
122 I32 myfloor = tmps_floor;
123 while (tmps_ix > myfloor) { /* clean up after last statement */
124 SV* sv = tmps_stack[tmps_ix];
125 tmps_stack[tmps_ix--] = Nullsv;
130 SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */
136 save_scalar_at(SV **sptr)
142 sv = *sptr = NEWSV(0,0);
143 if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
144 sv_upgrade(sv, SvTYPE(osv));
145 if (SvGMAGICAL(osv)) {
147 bool oldtainted = tainted;
149 if (tainting && tainted && (mg = mg_find(osv, 't'))) {
150 SAVESPTR(mg->mg_obj);
153 SvFLAGS(osv) |= (SvFLAGS(osv) &
154 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
155 tainted = oldtainted;
157 SvMAGIC(sv) = SvMAGIC(osv);
158 SvFLAGS(sv) |= SvMAGICAL(osv);
170 SV **sptr = &GvSV(gv);
172 SSPUSHPTR(SvREFCNT_inc(gv));
173 SSPUSHPTR(SvREFCNT_inc(*sptr));
175 return save_scalar_at(sptr);
179 save_svref(SV **sptr)
184 SSPUSHPTR(SvREFCNT_inc(*sptr));
185 SSPUSHINT(SAVEt_SVREF);
186 return save_scalar_at(sptr);
190 save_gp(GV *gv, I32 empty)
194 SSPUSHIV((IV)SvLEN(gv));
195 SvLEN(gv) = 0; /* forget that anything was allocated here */
196 SSPUSHIV((IV)SvCUR(gv));
197 SSPUSHPTR(SvPVX(gv));
199 SSPUSHPTR(SvREFCNT_inc(gv));
205 Newz(602, gp, 1, GP);
206 GvGP(gv) = gp_ref(gp);
207 GvSV(gv) = NEWSV(72,0);
208 GvLINE(gv) = curcop->cop_line;
224 if (!AvREAL(oav) && AvREIFY(oav))
231 GvAV(gv) = Null(AV*);
234 SvMAGIC(av) = SvMAGIC(oav);
235 SvFLAGS(av) |= SvMAGICAL(oav);
253 SSPUSHPTR(ohv = GvHVn(gv));
256 GvHV(gv) = Null(HV*);
259 SvMAGIC(hv) = SvMAGIC(ohv);
260 SvFLAGS(hv) |= SvMAGICAL(ohv);
271 save_item(register SV *item)
274 register SV *sv = NEWSV(0,0);
278 SSPUSHPTR(item); /* remember the pointer */
279 SSPUSHPTR(sv); /* remember the value */
280 SSPUSHINT(SAVEt_ITEM);
290 SSPUSHINT(SAVEt_INT);
294 save_long(long int *longp)
300 SSPUSHINT(SAVEt_LONG);
310 SSPUSHINT(SAVEt_I32);
320 SSPUSHINT(SAVEt_I16);
333 /* Cannot use save_sptr() to store a char* since the SV** cast will
334 * force word-alignment and we'll miss the pointer.
337 save_pptr(char **pptr)
343 SSPUSHINT(SAVEt_PPTR);
353 SSPUSHINT(SAVEt_SPTR);
357 save_threadsv(PADOFFSET i)
361 SV **svp = &THREADSV(i); /* XXX Change to save by offset */
362 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "save_threadsv %u: %p %p:%s\n",
363 i, svp, *svp, SvPEEK(*svp)));
367 croak("panic: save_threadsv called in non-threaded perl");
369 #endif /* USE_THREADS */
378 SSPUSHINT(SAVEt_NSTAB);
388 SSPUSHINT(SAVEt_HPTR);
398 SSPUSHINT(SAVEt_APTR);
407 SSPUSHINT(SAVEt_FREESV);
416 SSPUSHINT(SAVEt_FREEOP);
420 save_freepv(char *pv)
425 SSPUSHINT(SAVEt_FREEPV);
429 save_clearsv(SV **svp)
433 SSPUSHLONG((long)(svp-curpad));
434 SSPUSHINT(SAVEt_CLEARSV);
438 save_delete(HV *hv, char *key, I32 klen)
444 SSPUSHPTR(SvREFCNT_inc(hv));
445 SSPUSHINT(SAVEt_DELETE);
449 save_list(register SV **sarg, I32 maxsarg)
455 for (i = 1; i <= maxsarg; i++) {
457 sv_setsv(sv,sarg[i]);
459 SSPUSHPTR(sarg[i]); /* remember the pointer */
460 SSPUSHPTR(sv); /* remember the value */
461 SSPUSHINT(SAVEt_ITEM);
466 save_destructor(void (*f) (void *), void *p)
472 SSPUSHINT(SAVEt_DESTRUCTOR);
476 save_aelem(AV *av, I32 idx, SV **sptr)
480 SSPUSHPTR(SvREFCNT_inc(av));
482 SSPUSHPTR(SvREFCNT_inc(*sptr));
483 SSPUSHINT(SAVEt_AELEM);
484 save_scalar_at(sptr);
488 save_helem(HV *hv, SV *key, SV **sptr)
492 SSPUSHPTR(SvREFCNT_inc(hv));
493 SSPUSHPTR(SvREFCNT_inc(key));
494 SSPUSHPTR(SvREFCNT_inc(*sptr));
495 SSPUSHINT(SAVEt_HELEM);
496 save_scalar_at(sptr);
509 leave_scope(I32 base)
521 croak("panic: corrupt saved stack index");
522 while (savestack_ix > base) {
524 case SAVEt_ITEM: /* normal string */
525 value = (SV*)SSPOPPTR;
527 sv_replace(sv,value);
532 case SAVEt_SV: /* scalar reference */
533 value = (SV*)SSPOPPTR;
538 case SAVEt_SVREF: /* scalar reference */
539 value = (SV*)SSPOPPTR;
543 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
544 "restore svref: %p %p:%s -> %p:%s\n",
545 ptr, sv, SvPEEK(sv), value, SvPEEK(value)));
546 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
547 SvTYPE(sv) != SVt_PVGV)
549 (void)SvUPGRADE(value, SvTYPE(sv));
550 SvMAGIC(value) = SvMAGIC(sv);
551 SvFLAGS(value) |= SvMAGICAL(sv);
555 else if (SvTYPE(value) >= SVt_PVMG && SvMAGIC(value) &&
556 SvTYPE(value) != SVt_PVGV)
558 SvFLAGS(value) |= (SvFLAGS(value) &
559 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
560 SvMAGICAL_off(value);
570 case SAVEt_AV: /* array reference */
574 AV *goner = GvAV(gv);
575 SvMAGIC(av) = SvMAGIC(goner);
576 SvFLAGS(av) |= SvMAGICAL(goner);
577 SvMAGICAL_off(goner);
588 case SAVEt_HV: /* hash reference */
592 HV *goner = GvHV(gv);
593 SvMAGIC(hv) = SvMAGIC(goner);
594 SvFLAGS(hv) |= SvMAGICAL(goner);
595 SvMAGICAL_off(goner);
606 case SAVEt_INT: /* int reference */
608 *(int*)ptr = (int)SSPOPINT;
610 case SAVEt_LONG: /* long reference */
612 *(long*)ptr = (long)SSPOPLONG;
614 case SAVEt_I32: /* I32 reference */
616 *(I32*)ptr = (I32)SSPOPINT;
618 case SAVEt_I16: /* I16 reference */
620 *(I16*)ptr = (I16)SSPOPINT;
622 case SAVEt_IV: /* IV reference */
624 *(IV*)ptr = (IV)SSPOPIV;
626 case SAVEt_SPTR: /* SV* reference */
628 *(SV**)ptr = (SV*)SSPOPPTR;
630 case SAVEt_PPTR: /* char* reference */
632 *(char**)ptr = (char*)SSPOPPTR;
634 case SAVEt_HPTR: /* HV* reference */
636 *(HV**)ptr = (HV*)SSPOPPTR;
638 case SAVEt_APTR: /* AV* reference */
640 *(AV**)ptr = (AV*)SSPOPPTR;
644 (void)sv_clear((SV*)gv);
646 case SAVEt_GP: /* scalar reference */
649 if (SvPOK(gv) && SvLEN(gv) > 0) {
652 SvPVX(gv) = (char *)SSPOPPTR;
653 SvCUR(gv) = (STRLEN)SSPOPIV;
654 SvLEN(gv) = (STRLEN)SSPOPIV;
661 SvREFCNT_dec((SV*)ptr);
666 curpad = AvARRAY(comppad);
671 Safefree((char*)ptr);
674 ptr = (void*)&curpad[SSPOPLONG];
676 /* Can clear pad variable in place? */
677 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
678 if (SvTHINKFIRST(sv)) {
680 croak("panic: leave_scope clearsv");
687 switch (SvTYPE(sv)) {
697 croak("panic: leave_scope pad code");
709 else { /* Someone has a claim on this, so abandon it. */
710 U32 padflags = SvFLAGS(sv) & (SVs_PADBUSY|SVs_PADMY|SVs_PADTMP);
711 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
712 case SVt_PVAV: *(SV**)ptr = (SV*)newAV(); break;
713 case SVt_PVHV: *(SV**)ptr = (SV*)newHV(); break;
714 default: *(SV**)ptr = NEWSV(0,0); break;
716 SvREFCNT_dec(sv); /* Cast current value to the winds. */
717 SvFLAGS(*(SV**)ptr) |= padflags; /* preserve pad nature */
724 (void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
728 case SAVEt_DESTRUCTOR:
732 case SAVEt_REGCONTEXT:
734 savestack_ix -= i; /* regexp must have croaked */
736 case SAVEt_STACK_POS: /* Position on Perl stack */
738 stack_sp = stack_base + i;
740 case SAVEt_AELEM: /* array element */
741 value = (SV*)SSPOPPTR;
744 ptr = av_fetch(av,i,1);
747 if (sv && sv != &sv_undef) {
748 if (SvRMAGICAL(av) && mg_find((SV*)av, 'P'))
749 (void)SvREFCNT_inc(sv);
757 case SAVEt_HELEM: /* hash element */
758 value = (SV*)SSPOPPTR;
761 ptr = hv_fetch_ent(hv, sv, 1, 0);
763 SV *oval = HeVAL((HE*)ptr);
764 if (oval && oval != &sv_undef) {
765 ptr = &HeVAL((HE*)ptr);
766 if (SvRMAGICAL(hv) && mg_find((SV*)hv, 'P'))
767 (void)SvREFCNT_inc(*(SV**)ptr);
781 croak("panic: leave_scope inconsistency");
789 cx_dump(PERL_CONTEXT *cx)
792 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), block_type[cx->cx_type]);
793 if (cx->cx_type != CXt_SUBST) {
794 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
795 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop);
796 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
797 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
798 PerlIO_printf(Perl_debug_log, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
799 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm);
800 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
802 switch (cx->cx_type) {
807 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%lx\n",
808 (long)cx->blk_sub.cv);
809 PerlIO_printf(Perl_debug_log, "BLK_SUB.GV = 0x%lx\n",
810 (long)cx->blk_sub.gv);
811 PerlIO_printf(Perl_debug_log, "BLK_SUB.DFOUTGV = 0x%lx\n",
812 (long)cx->blk_sub.dfoutgv);
813 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
814 (long)cx->blk_sub.olddepth);
815 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
816 (int)cx->blk_sub.hasargs);
819 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
820 (long)cx->blk_eval.old_in_eval);
821 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
822 op_name[cx->blk_eval.old_op_type],
823 op_desc[cx->blk_eval.old_op_type]);
824 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
825 cx->blk_eval.old_name);
826 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n",
827 (long)cx->blk_eval.old_eval_root);
831 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n",
833 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
834 (long)cx->blk_loop.resetsp);
835 PerlIO_printf(Perl_debug_log, "BLK_LOOP.REDO_OP = 0x%lx\n",
836 (long)cx->blk_loop.redo_op);
837 PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%lx\n",
838 (long)cx->blk_loop.next_op);
839 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LAST_OP = 0x%lx\n",
840 (long)cx->blk_loop.last_op);
841 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
842 (long)cx->blk_loop.iterix);
843 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%lx\n",
844 (long)cx->blk_loop.iterary);
845 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%lx\n",
846 (long)cx->blk_loop.itervar);
847 if (cx->blk_loop.itervar)
848 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%lx\n",
849 (long)cx->blk_loop.itersave);
850 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERLVAL = 0x%lx\n",
851 (long)cx->blk_loop.iterlval);
855 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
857 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
858 (long)cx->sb_maxiters);
859 PerlIO_printf(Perl_debug_log, "SB_SAFEBASE = %ld\n",
860 (long)cx->sb_safebase);
861 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
863 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
865 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%lx\n",
867 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%lx\n",
869 PerlIO_printf(Perl_debug_log, "SB_S = 0x%lx\n",
871 PerlIO_printf(Perl_debug_log, "SB_M = 0x%lx\n",
873 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%lx\n",
874 (long)cx->sb_strend);
875 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%lx\n",