3 * Copyright (c) 1991-1999, 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 default_protect(int *excpt, protect_body_t body, ...)
27 DEBUG_l(deb("Setting up local jumplevel %p, was %p\n",
28 &cur_env, PL_top_env));
34 ret = CALL_FPTR(body)(args);
43 stack_grow(SV **sp, SV **p, int n)
46 #if defined(DEBUGGING) && !defined(USE_THREADS)
47 static int growing = 0;
52 #ifndef STRESS_REALLOC
53 av_extend(PL_curstack, (p - PL_stack_base) + (n) + 128);
55 av_extend(PL_curstack, (p - PL_stack_base) + (n) + 1);
57 #if defined(DEBUGGING) && !defined(USE_THREADS)
63 #ifndef STRESS_REALLOC
64 #define GROW(old) ((old) * 3 / 2)
66 #define GROW(old) ((old) + 1)
70 new_stackinfo(I32 stitems, I32 cxitems)
74 New(56, si, 1, PERL_SI);
75 si->si_stack = newAV();
76 AvREAL_off(si->si_stack);
77 av_extend(si->si_stack, stitems > 0 ? stitems-1 : 0);
78 AvALLOC(si->si_stack)[0] = &PL_sv_undef;
79 AvFILLp(si->si_stack) = 0;
82 si->si_cxmax = cxitems - 1;
84 si->si_type = PERLSI_UNDEF;
85 New(56, si->si_cxstack, cxitems, PERL_CONTEXT);
93 cxstack_max = GROW(cxstack_max);
94 Renew(cxstack, cxstack_max + 1, PERL_CONTEXT); /* XXX should fix CXINC macro */
95 return cxstack_ix + 1;
99 push_return(OP *retop)
102 if (PL_retstack_ix == PL_retstack_max) {
103 PL_retstack_max = GROW(PL_retstack_max);
104 Renew(PL_retstack, PL_retstack_max, OP*);
106 PL_retstack[PL_retstack_ix++] = retop;
113 if (PL_retstack_ix > 0)
114 return PL_retstack[--PL_retstack_ix];
123 if (PL_scopestack_ix == PL_scopestack_max) {
124 PL_scopestack_max = GROW(PL_scopestack_max);
125 Renew(PL_scopestack, PL_scopestack_max, I32);
127 PL_scopestack[PL_scopestack_ix++] = PL_savestack_ix;
135 I32 oldsave = PL_scopestack[--PL_scopestack_ix];
136 LEAVE_SCOPE(oldsave);
143 I32 oldmax = PL_markstack_max - PL_markstack;
144 I32 newmax = GROW(oldmax);
146 Renew(PL_markstack, newmax, I32);
147 PL_markstack_ptr = PL_markstack + oldmax;
148 PL_markstack_max = PL_markstack + newmax;
155 PL_savestack_max = GROW(PL_savestack_max) + 4;
156 Renew(PL_savestack, PL_savestack_max, ANY);
165 #ifndef STRESS_REALLOC
167 n = (PL_tmps_max < 512) ? 128 : 512;
169 PL_tmps_max = PL_tmps_ix + n + 1;
170 Renew(PL_tmps_stack, PL_tmps_max, SV*);
178 /* XXX should tmps_floor live in cxstack? */
179 I32 myfloor = PL_tmps_floor;
180 while (PL_tmps_ix > myfloor) { /* clean up after last statement */
181 SV* sv = PL_tmps_stack[PL_tmps_ix];
182 PL_tmps_stack[PL_tmps_ix--] = Nullsv;
185 SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */
191 save_scalar_at(SV **sptr)
197 sv = *sptr = NEWSV(0,0);
198 if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
199 sv_upgrade(sv, SvTYPE(osv));
200 if (SvGMAGICAL(osv)) {
202 bool oldtainted = PL_tainted;
204 if (PL_tainting && PL_tainted && (mg = mg_find(osv, 't'))) {
205 SAVESPTR(mg->mg_obj);
208 SvFLAGS(osv) |= (SvFLAGS(osv) &
209 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
210 PL_tainted = oldtainted;
212 SvMAGIC(sv) = SvMAGIC(osv);
213 SvFLAGS(sv) |= SvMAGICAL(osv);
225 SV **sptr = &GvSV(gv);
227 SSPUSHPTR(SvREFCNT_inc(gv));
228 SSPUSHPTR(SvREFCNT_inc(*sptr));
230 return save_scalar_at(sptr);
234 save_svref(SV **sptr)
239 SSPUSHPTR(SvREFCNT_inc(*sptr));
240 SSPUSHINT(SAVEt_SVREF);
241 return save_scalar_at(sptr);
244 /* Like save_svref(), but doesn't deal with magic. Can be used to
245 * restore a global SV to its prior contents, freeing new value. */
247 save_generic_svref(SV **sptr)
252 SSPUSHPTR(SvREFCNT_inc(*sptr));
253 SSPUSHINT(SAVEt_GENERIC_SVREF);
257 save_gp(GV *gv, I32 empty)
261 SSPUSHIV((IV)SvLEN(gv));
262 SvLEN(gv) = 0; /* forget that anything was allocated here */
263 SSPUSHIV((IV)SvCUR(gv));
264 SSPUSHPTR(SvPVX(gv));
266 SSPUSHPTR(SvREFCNT_inc(gv));
274 PL_sub_generation++; /* taking a method out of circulation */
275 Newz(602, gp, 1, GP);
276 GvGP(gv) = gp_ref(gp);
277 GvSV(gv) = NEWSV(72,0);
278 GvLINE(gv) = PL_curcop->cop_line;
294 if (!AvREAL(oav) && AvREIFY(oav))
301 GvAV(gv) = Null(AV*);
304 SvMAGIC(av) = SvMAGIC(oav);
305 SvFLAGS(av) |= SvMAGICAL(oav);
323 SSPUSHPTR(ohv = GvHVn(gv));
326 GvHV(gv) = Null(HV*);
329 SvMAGIC(hv) = SvMAGIC(ohv);
330 SvFLAGS(hv) |= SvMAGICAL(ohv);
341 save_item(register SV *item)
344 register SV *sv = NEWSV(0,0);
348 SSPUSHPTR(item); /* remember the pointer */
349 SSPUSHPTR(sv); /* remember the value */
350 SSPUSHINT(SAVEt_ITEM);
360 SSPUSHINT(SAVEt_INT);
364 save_long(long int *longp)
370 SSPUSHINT(SAVEt_LONG);
380 SSPUSHINT(SAVEt_I32);
390 SSPUSHINT(SAVEt_I16);
403 /* Cannot use save_sptr() to store a char* since the SV** cast will
404 * force word-alignment and we'll miss the pointer.
407 save_pptr(char **pptr)
413 SSPUSHINT(SAVEt_PPTR);
423 SSPUSHINT(SAVEt_SPTR);
427 save_threadsv(PADOFFSET i)
431 SV **svp = &THREADSV(i); /* XXX Change to save by offset */
432 DEBUG_S(PerlIO_printf(PerlIO_stderr(), "save_threadsv %u: %p %p:%s\n",
433 i, svp, *svp, SvPEEK(*svp)));
437 croak("panic: save_threadsv called in non-threaded perl");
439 #endif /* USE_THREADS */
448 SSPUSHINT(SAVEt_NSTAB);
458 SSPUSHINT(SAVEt_HPTR);
468 SSPUSHINT(SAVEt_APTR);
477 SSPUSHINT(SAVEt_FREESV);
486 SSPUSHINT(SAVEt_FREEOP);
490 save_freepv(char *pv)
495 SSPUSHINT(SAVEt_FREEPV);
499 save_clearsv(SV **svp)
503 SSPUSHLONG((long)(svp-PL_curpad));
504 SSPUSHINT(SAVEt_CLEARSV);
508 save_delete(HV *hv, char *key, I32 klen)
514 SSPUSHPTR(SvREFCNT_inc(hv));
515 SSPUSHINT(SAVEt_DELETE);
519 save_list(register SV **sarg, I32 maxsarg)
525 for (i = 1; i <= maxsarg; i++) {
527 sv_setsv(sv,sarg[i]);
529 SSPUSHPTR(sarg[i]); /* remember the pointer */
530 SSPUSHPTR(sv); /* remember the value */
531 SSPUSHINT(SAVEt_ITEM);
537 save_destructor(DESTRUCTORFUNC f, void* p)
539 save_destructor(void (*f) (void *), void *p)
546 SSPUSHINT(SAVEt_DESTRUCTOR);
550 save_aelem(AV *av, I32 idx, SV **sptr)
554 SSPUSHPTR(SvREFCNT_inc(av));
556 SSPUSHPTR(SvREFCNT_inc(*sptr));
557 SSPUSHINT(SAVEt_AELEM);
558 save_scalar_at(sptr);
562 save_helem(HV *hv, SV *key, SV **sptr)
566 SSPUSHPTR(SvREFCNT_inc(hv));
567 SSPUSHPTR(SvREFCNT_inc(key));
568 SSPUSHPTR(SvREFCNT_inc(*sptr));
569 SSPUSHINT(SAVEt_HELEM);
570 save_scalar_at(sptr);
583 save_alloc(I32 size, I32 pad)
586 register I32 start = pad + ((char*)&PL_savestack[PL_savestack_ix]
587 - (char*)PL_savestack);
588 register I32 elems = 1 + ((size + pad - 1) / sizeof(*PL_savestack));
590 /* SSCHECK may not be good enough */
591 while (PL_savestack_ix + elems + 2 > PL_savestack_max)
594 PL_savestack_ix += elems;
596 SSPUSHINT(SAVEt_ALLOC);
601 leave_scope(I32 base)
613 croak("panic: corrupt saved stack index");
614 while (PL_savestack_ix > base) {
616 case SAVEt_ITEM: /* normal string */
617 value = (SV*)SSPOPPTR;
619 sv_replace(sv,value);
624 case SAVEt_SV: /* scalar reference */
625 value = (SV*)SSPOPPTR;
630 case SAVEt_GENERIC_SVREF: /* generic sv */
631 value = (SV*)SSPOPPTR;
640 case SAVEt_SVREF: /* scalar reference */
641 value = (SV*)SSPOPPTR;
645 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
646 "restore svref: %p %p:%s -> %p:%s\n",
647 ptr, sv, SvPEEK(sv), value, SvPEEK(value)));
648 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
649 SvTYPE(sv) != SVt_PVGV)
651 (void)SvUPGRADE(value, SvTYPE(sv));
652 SvMAGIC(value) = SvMAGIC(sv);
653 SvFLAGS(value) |= SvMAGICAL(sv);
657 else if (SvTYPE(value) >= SVt_PVMG && SvMAGIC(value) &&
658 SvTYPE(value) != SVt_PVGV)
660 SvFLAGS(value) |= (SvFLAGS(value) &
661 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
662 SvMAGICAL_off(value);
672 case SAVEt_AV: /* array reference */
676 AV *goner = GvAV(gv);
677 SvMAGIC(av) = SvMAGIC(goner);
678 SvFLAGS(av) |= SvMAGICAL(goner);
679 SvMAGICAL_off(goner);
690 case SAVEt_HV: /* hash reference */
694 HV *goner = GvHV(gv);
695 SvMAGIC(hv) = SvMAGIC(goner);
696 SvFLAGS(hv) |= SvMAGICAL(goner);
697 SvMAGICAL_off(goner);
708 case SAVEt_INT: /* int reference */
710 *(int*)ptr = (int)SSPOPINT;
712 case SAVEt_LONG: /* long reference */
714 *(long*)ptr = (long)SSPOPLONG;
716 case SAVEt_I32: /* I32 reference */
718 *(I32*)ptr = (I32)SSPOPINT;
720 case SAVEt_I16: /* I16 reference */
722 *(I16*)ptr = (I16)SSPOPINT;
724 case SAVEt_IV: /* IV reference */
726 *(IV*)ptr = (IV)SSPOPIV;
728 case SAVEt_SPTR: /* SV* reference */
730 *(SV**)ptr = (SV*)SSPOPPTR;
732 case SAVEt_PPTR: /* char* reference */
734 *(char**)ptr = (char*)SSPOPPTR;
736 case SAVEt_HPTR: /* HV* reference */
738 *(HV**)ptr = (HV*)SSPOPPTR;
740 case SAVEt_APTR: /* AV* reference */
742 *(AV**)ptr = (AV*)SSPOPPTR;
746 (void)sv_clear((SV*)gv);
748 case SAVEt_GP: /* scalar reference */
751 if (SvPVX(gv) && SvLEN(gv) > 0) {
754 SvPVX(gv) = (char *)SSPOPPTR;
755 SvCUR(gv) = (STRLEN)SSPOPIV;
756 SvLEN(gv) = (STRLEN)SSPOPIV;
760 PL_sub_generation++; /* putting a method back into circulation */
765 SvREFCNT_dec((SV*)ptr);
770 PL_curpad = AvARRAY(PL_comppad);
775 Safefree((char*)ptr);
778 ptr = (void*)&PL_curpad[SSPOPLONG];
780 /* Can clear pad variable in place? */
781 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
782 if (SvTHINKFIRST(sv))
787 switch (SvTYPE(sv)) {
797 croak("panic: leave_scope pad code");
809 else { /* Someone has a claim on this, so abandon it. */
810 U32 padflags = SvFLAGS(sv) & (SVs_PADBUSY|SVs_PADMY|SVs_PADTMP);
811 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
812 case SVt_PVAV: *(SV**)ptr = (SV*)newAV(); break;
813 case SVt_PVHV: *(SV**)ptr = (SV*)newHV(); break;
814 default: *(SV**)ptr = NEWSV(0,0); break;
816 SvREFCNT_dec(sv); /* Cast current value to the winds. */
817 SvFLAGS(*(SV**)ptr) |= padflags; /* preserve pad nature */
824 (void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
828 case SAVEt_DESTRUCTOR:
830 (CALLDESTRUCTOR)(ptr);
832 case SAVEt_REGCONTEXT:
835 PL_savestack_ix -= i; /* regexp must have croaked */
837 case SAVEt_STACK_POS: /* Position on Perl stack */
839 PL_stack_sp = PL_stack_base + i;
841 case SAVEt_AELEM: /* array element */
842 value = (SV*)SSPOPPTR;
845 ptr = av_fetch(av,i,1);
848 if (sv && sv != &PL_sv_undef) {
849 if (SvTIED_mg((SV*)av, 'P'))
850 (void)SvREFCNT_inc(sv);
858 case SAVEt_HELEM: /* hash element */
859 value = (SV*)SSPOPPTR;
862 ptr = hv_fetch_ent(hv, sv, 1, 0);
864 SV *oval = HeVAL((HE*)ptr);
865 if (oval && oval != &PL_sv_undef) {
866 ptr = &HeVAL((HE*)ptr);
867 if (SvTIED_mg((SV*)hv, 'P'))
868 (void)SvREFCNT_inc(*(SV**)ptr);
879 PL_op = (OP*)SSPOPPTR;
882 if (GvHV(PL_hintgv)) {
883 SvREFCNT_dec((SV*)GvHV(PL_hintgv));
884 GvHV(PL_hintgv) = NULL;
886 *(I32*)&PL_hints = (I32)SSPOPINT;
889 croak("panic: leave_scope inconsistency");
895 cx_dump(PERL_CONTEXT *cx)
899 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]);
900 if (CxTYPE(cx) != CXt_SUBST) {
901 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
902 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop);
903 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
904 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
905 PerlIO_printf(Perl_debug_log, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
906 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm);
907 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
909 switch (CxTYPE(cx)) {
914 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%lx\n",
915 (long)cx->blk_sub.cv);
916 PerlIO_printf(Perl_debug_log, "BLK_SUB.GV = 0x%lx\n",
917 (long)cx->blk_sub.gv);
918 PerlIO_printf(Perl_debug_log, "BLK_SUB.DFOUTGV = 0x%lx\n",
919 (long)cx->blk_sub.dfoutgv);
920 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
921 (long)cx->blk_sub.olddepth);
922 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
923 (int)cx->blk_sub.hasargs);
926 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
927 (long)cx->blk_eval.old_in_eval);
928 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
929 PL_op_name[cx->blk_eval.old_op_type],
930 PL_op_desc[cx->blk_eval.old_op_type]);
931 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
932 cx->blk_eval.old_name);
933 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n",
934 (long)cx->blk_eval.old_eval_root);
938 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n",
940 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
941 (long)cx->blk_loop.resetsp);
942 PerlIO_printf(Perl_debug_log, "BLK_LOOP.REDO_OP = 0x%lx\n",
943 (long)cx->blk_loop.redo_op);
944 PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%lx\n",
945 (long)cx->blk_loop.next_op);
946 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LAST_OP = 0x%lx\n",
947 (long)cx->blk_loop.last_op);
948 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
949 (long)cx->blk_loop.iterix);
950 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%lx\n",
951 (long)cx->blk_loop.iterary);
952 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%lx\n",
953 (long)cx->blk_loop.itervar);
954 if (cx->blk_loop.itervar)
955 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%lx\n",
956 (long)cx->blk_loop.itersave);
957 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERLVAL = 0x%lx\n",
958 (long)cx->blk_loop.iterlval);
962 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
964 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
965 (long)cx->sb_maxiters);
966 PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n",
967 (long)cx->sb_rflags);
968 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
970 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
972 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%lx\n",
974 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%lx\n",
976 PerlIO_printf(Perl_debug_log, "SB_S = 0x%lx\n",
978 PerlIO_printf(Perl_debug_log, "SB_M = 0x%lx\n",
980 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%lx\n",
981 (long)cx->sb_strend);
982 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%lx\n",
986 #endif /* DEBUGGING */