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
16 #define PERL_IN_SCOPE_C
20 Perl_default_protect(pTHX_ volatile JMPENV *pcur_env, int *excpt,
21 protect_body_t body, ...)
26 ret = vdefault_protect(pcur_env, excpt, body, &args);
32 Perl_vdefault_protect(pTHX_ volatile JMPENV *pcur_env, int *excpt,
33 protect_body_t body, va_list *args)
39 DEBUG_l(Perl_deb(aTHX_ "Setting up local jumplevel %p, was %p\n",
40 pcur_env, PL_top_env));
45 ret = CALL_FPTR(body)(aTHX_ *args);
52 Perl_stack_grow(pTHX_ SV **sp, SV **p, int n)
55 #if defined(DEBUGGING) && !defined(USE_THREADS)
56 static int growing = 0;
61 #ifndef STRESS_REALLOC
62 av_extend(PL_curstack, (p - PL_stack_base) + (n) + 128);
64 av_extend(PL_curstack, (p - PL_stack_base) + (n) + 1);
66 #if defined(DEBUGGING) && !defined(USE_THREADS)
72 #ifndef STRESS_REALLOC
73 #define GROW(old) ((old) * 3 / 2)
75 #define GROW(old) ((old) + 1)
79 Perl_new_stackinfo(pTHX_ I32 stitems, I32 cxitems)
83 New(56, si, 1, PERL_SI);
84 si->si_stack = newAV();
85 AvREAL_off(si->si_stack);
86 av_extend(si->si_stack, stitems > 0 ? stitems-1 : 0);
87 AvALLOC(si->si_stack)[0] = &PL_sv_undef;
88 AvFILLp(si->si_stack) = 0;
91 si->si_cxmax = cxitems - 1;
93 si->si_type = PERLSI_UNDEF;
94 New(56, si->si_cxstack, cxitems, PERL_CONTEXT);
102 cxstack_max = GROW(cxstack_max);
103 Renew(cxstack, cxstack_max + 1, PERL_CONTEXT); /* XXX should fix CXINC macro */
104 return cxstack_ix + 1;
108 Perl_push_return(pTHX_ OP *retop)
111 if (PL_retstack_ix == PL_retstack_max) {
112 PL_retstack_max = GROW(PL_retstack_max);
113 Renew(PL_retstack, PL_retstack_max, OP*);
115 PL_retstack[PL_retstack_ix++] = retop;
119 Perl_pop_return(pTHX)
122 if (PL_retstack_ix > 0)
123 return PL_retstack[--PL_retstack_ix];
129 Perl_push_scope(pTHX)
132 if (PL_scopestack_ix == PL_scopestack_max) {
133 PL_scopestack_max = GROW(PL_scopestack_max);
134 Renew(PL_scopestack, PL_scopestack_max, I32);
136 PL_scopestack[PL_scopestack_ix++] = PL_savestack_ix;
144 I32 oldsave = PL_scopestack[--PL_scopestack_ix];
145 LEAVE_SCOPE(oldsave);
149 Perl_markstack_grow(pTHX)
152 I32 oldmax = PL_markstack_max - PL_markstack;
153 I32 newmax = GROW(oldmax);
155 Renew(PL_markstack, newmax, I32);
156 PL_markstack_ptr = PL_markstack + oldmax;
157 PL_markstack_max = PL_markstack + newmax;
161 Perl_savestack_grow(pTHX)
164 PL_savestack_max = GROW(PL_savestack_max) + 4;
165 Renew(PL_savestack, PL_savestack_max, ANY);
171 Perl_tmps_grow(pTHX_ I32 n)
174 #ifndef STRESS_REALLOC
176 n = (PL_tmps_max < 512) ? 128 : 512;
178 PL_tmps_max = PL_tmps_ix + n + 1;
179 Renew(PL_tmps_stack, PL_tmps_max, SV*);
187 /* XXX should tmps_floor live in cxstack? */
188 I32 myfloor = PL_tmps_floor;
189 while (PL_tmps_ix > myfloor) { /* clean up after last statement */
190 SV* sv = PL_tmps_stack[PL_tmps_ix];
191 PL_tmps_stack[PL_tmps_ix--] = Nullsv;
194 SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */
200 S_save_scalar_at(pTHX_ SV **sptr)
206 sv = *sptr = NEWSV(0,0);
207 if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
208 sv_upgrade(sv, SvTYPE(osv));
209 if (SvGMAGICAL(osv)) {
211 bool oldtainted = PL_tainted;
213 if (PL_tainting && PL_tainted && (mg = mg_find(osv, 't'))) {
214 SAVESPTR(mg->mg_obj);
217 SvFLAGS(osv) |= (SvFLAGS(osv) &
218 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
219 PL_tainted = oldtainted;
221 SvMAGIC(sv) = SvMAGIC(osv);
222 SvFLAGS(sv) |= SvMAGICAL(osv);
231 Perl_save_scalar(pTHX_ GV *gv)
234 SV **sptr = &GvSV(gv);
236 SSPUSHPTR(SvREFCNT_inc(gv));
237 SSPUSHPTR(SvREFCNT_inc(*sptr));
239 return save_scalar_at(sptr);
243 Perl_save_svref(pTHX_ SV **sptr)
248 SSPUSHPTR(SvREFCNT_inc(*sptr));
249 SSPUSHINT(SAVEt_SVREF);
250 return save_scalar_at(sptr);
253 /* Like save_svref(), but doesn't deal with magic. Can be used to
254 * restore a global SV to its prior contents, freeing new value. */
256 Perl_save_generic_svref(pTHX_ SV **sptr)
261 SSPUSHPTR(SvREFCNT_inc(*sptr));
262 SSPUSHINT(SAVEt_GENERIC_SVREF);
266 Perl_save_gp(pTHX_ GV *gv, I32 empty)
270 SSPUSHIV((IV)SvLEN(gv));
271 SvLEN(gv) = 0; /* forget that anything was allocated here */
272 SSPUSHIV((IV)SvCUR(gv));
273 SSPUSHPTR(SvPVX(gv));
275 SSPUSHPTR(SvREFCNT_inc(gv));
283 PL_sub_generation++; /* taking a method out of circulation */
284 Newz(602, gp, 1, GP);
285 GvGP(gv) = gp_ref(gp);
286 GvSV(gv) = NEWSV(72,0);
287 GvLINE(gv) = PL_curcop->cop_line;
297 Perl_save_ary(pTHX_ GV *gv)
303 if (!AvREAL(oav) && AvREIFY(oav))
310 GvAV(gv) = Null(AV*);
313 SvMAGIC(av) = SvMAGIC(oav);
314 SvFLAGS(av) |= SvMAGICAL(oav);
325 Perl_save_hash(pTHX_ GV *gv)
332 SSPUSHPTR(ohv = GvHVn(gv));
335 GvHV(gv) = Null(HV*);
338 SvMAGIC(hv) = SvMAGIC(ohv);
339 SvFLAGS(hv) |= SvMAGICAL(ohv);
350 Perl_save_item(pTHX_ register SV *item)
353 register SV *sv = NEWSV(0,0);
357 SSPUSHPTR(item); /* remember the pointer */
358 SSPUSHPTR(sv); /* remember the value */
359 SSPUSHINT(SAVEt_ITEM);
363 Perl_save_int(pTHX_ int *intp)
369 SSPUSHINT(SAVEt_INT);
373 Perl_save_long(pTHX_ long int *longp)
379 SSPUSHINT(SAVEt_LONG);
383 Perl_save_I32(pTHX_ I32 *intp)
389 SSPUSHINT(SAVEt_I32);
393 Perl_save_I16(pTHX_ I16 *intp)
399 SSPUSHINT(SAVEt_I16);
403 Perl_save_iv(pTHX_ IV *ivp)
412 /* Cannot use save_sptr() to store a char* since the SV** cast will
413 * force word-alignment and we'll miss the pointer.
416 Perl_save_pptr(pTHX_ char **pptr)
422 SSPUSHINT(SAVEt_PPTR);
426 Perl_save_sptr(pTHX_ SV **sptr)
432 SSPUSHINT(SAVEt_SPTR);
436 Perl_save_threadsv(pTHX_ PADOFFSET i)
440 SV **svp = &THREADSV(i); /* XXX Change to save by offset */
441 DEBUG_S(PerlIO_printf(Perl_debug_log, "save_threadsv %u: %p %p:%s\n",
442 i, svp, *svp, SvPEEK(*svp)));
446 Perl_croak(aTHX_ "panic: save_threadsv called in non-threaded perl");
448 #endif /* USE_THREADS */
452 Perl_save_nogv(pTHX_ GV *gv)
457 SSPUSHINT(SAVEt_NSTAB);
461 Perl_save_hptr(pTHX_ HV **hptr)
467 SSPUSHINT(SAVEt_HPTR);
471 Perl_save_aptr(pTHX_ AV **aptr)
477 SSPUSHINT(SAVEt_APTR);
481 Perl_save_freesv(pTHX_ SV *sv)
486 SSPUSHINT(SAVEt_FREESV);
490 Perl_save_freeop(pTHX_ OP *o)
495 SSPUSHINT(SAVEt_FREEOP);
499 Perl_save_freepv(pTHX_ char *pv)
504 SSPUSHINT(SAVEt_FREEPV);
508 Perl_save_clearsv(pTHX_ SV **svp)
512 SSPUSHLONG((long)(svp-PL_curpad));
513 SSPUSHINT(SAVEt_CLEARSV);
517 Perl_save_delete(pTHX_ HV *hv, char *key, I32 klen)
523 SSPUSHPTR(SvREFCNT_inc(hv));
524 SSPUSHINT(SAVEt_DELETE);
528 Perl_save_list(pTHX_ register SV **sarg, I32 maxsarg)
534 for (i = 1; i <= maxsarg; i++) {
536 sv_setsv(sv,sarg[i]);
538 SSPUSHPTR(sarg[i]); /* remember the pointer */
539 SSPUSHPTR(sv); /* remember the value */
540 SSPUSHINT(SAVEt_ITEM);
545 Perl_save_destructor(pTHX_ DESTRUCTORFUNC_NOCONTEXT_t f, void* p)
551 SSPUSHINT(SAVEt_DESTRUCTOR);
555 Perl_save_destructor_x(pTHX_ DESTRUCTORFUNC_t f, void* p)
561 SSPUSHINT(SAVEt_DESTRUCTOR_X);
565 Perl_save_aelem(pTHX_ AV *av, I32 idx, SV **sptr)
569 SSPUSHPTR(SvREFCNT_inc(av));
571 SSPUSHPTR(SvREFCNT_inc(*sptr));
572 SSPUSHINT(SAVEt_AELEM);
573 save_scalar_at(sptr);
577 Perl_save_helem(pTHX_ HV *hv, SV *key, SV **sptr)
581 SSPUSHPTR(SvREFCNT_inc(hv));
582 SSPUSHPTR(SvREFCNT_inc(key));
583 SSPUSHPTR(SvREFCNT_inc(*sptr));
584 SSPUSHINT(SAVEt_HELEM);
585 save_scalar_at(sptr);
598 Perl_save_alloc(pTHX_ I32 size, I32 pad)
601 register I32 start = pad + ((char*)&PL_savestack[PL_savestack_ix]
602 - (char*)PL_savestack);
603 register I32 elems = 1 + ((size + pad - 1) / sizeof(*PL_savestack));
605 /* SSCHECK may not be good enough */
606 while (PL_savestack_ix + elems + 2 > PL_savestack_max)
609 PL_savestack_ix += elems;
611 SSPUSHINT(SAVEt_ALLOC);
616 Perl_leave_scope(pTHX_ I32 base)
628 Perl_croak(aTHX_ "panic: corrupt saved stack index");
629 while (PL_savestack_ix > base) {
631 case SAVEt_ITEM: /* normal string */
632 value = (SV*)SSPOPPTR;
634 sv_replace(sv,value);
639 case SAVEt_SV: /* scalar reference */
640 value = (SV*)SSPOPPTR;
645 case SAVEt_GENERIC_SVREF: /* generic sv */
646 value = (SV*)SSPOPPTR;
655 case SAVEt_SVREF: /* scalar reference */
656 value = (SV*)SSPOPPTR;
660 DEBUG_S(PerlIO_printf(Perl_debug_log,
661 "restore svref: %p %p:%s -> %p:%s\n",
662 ptr, sv, SvPEEK(sv), value, SvPEEK(value)));
663 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
664 SvTYPE(sv) != SVt_PVGV)
666 (void)SvUPGRADE(value, SvTYPE(sv));
667 SvMAGIC(value) = SvMAGIC(sv);
668 SvFLAGS(value) |= SvMAGICAL(sv);
672 else if (SvTYPE(value) >= SVt_PVMG && SvMAGIC(value) &&
673 SvTYPE(value) != SVt_PVGV)
675 SvFLAGS(value) |= (SvFLAGS(value) &
676 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
677 SvMAGICAL_off(value);
687 case SAVEt_AV: /* array reference */
691 AV *goner = GvAV(gv);
692 SvMAGIC(av) = SvMAGIC(goner);
693 SvFLAGS(av) |= SvMAGICAL(goner);
694 SvMAGICAL_off(goner);
705 case SAVEt_HV: /* hash reference */
709 HV *goner = GvHV(gv);
710 SvMAGIC(hv) = SvMAGIC(goner);
711 SvFLAGS(hv) |= SvMAGICAL(goner);
712 SvMAGICAL_off(goner);
723 case SAVEt_INT: /* int reference */
725 *(int*)ptr = (int)SSPOPINT;
727 case SAVEt_LONG: /* long reference */
729 *(long*)ptr = (long)SSPOPLONG;
731 case SAVEt_I32: /* I32 reference */
733 *(I32*)ptr = (I32)SSPOPINT;
735 case SAVEt_I16: /* I16 reference */
737 *(I16*)ptr = (I16)SSPOPINT;
739 case SAVEt_IV: /* IV reference */
741 *(IV*)ptr = (IV)SSPOPIV;
743 case SAVEt_SPTR: /* SV* reference */
745 *(SV**)ptr = (SV*)SSPOPPTR;
747 case SAVEt_PPTR: /* char* reference */
749 *(char**)ptr = (char*)SSPOPPTR;
751 case SAVEt_HPTR: /* HV* reference */
753 *(HV**)ptr = (HV*)SSPOPPTR;
755 case SAVEt_APTR: /* AV* reference */
757 *(AV**)ptr = (AV*)SSPOPPTR;
761 (void)sv_clear((SV*)gv);
763 case SAVEt_GP: /* scalar reference */
766 if (SvPVX(gv) && SvLEN(gv) > 0) {
769 SvPVX(gv) = (char *)SSPOPPTR;
770 SvCUR(gv) = (STRLEN)SSPOPIV;
771 SvLEN(gv) = (STRLEN)SSPOPIV;
775 PL_sub_generation++; /* putting a method back into circulation */
780 SvREFCNT_dec((SV*)ptr);
785 PL_curpad = AvARRAY(PL_comppad);
790 Safefree((char*)ptr);
793 ptr = (void*)&PL_curpad[SSPOPLONG];
795 /* Can clear pad variable in place? */
796 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
797 if (SvTHINKFIRST(sv))
802 switch (SvTYPE(sv)) {
812 Perl_croak(aTHX_ "panic: leave_scope pad code");
824 else { /* Someone has a claim on this, so abandon it. */
825 U32 padflags = SvFLAGS(sv) & (SVs_PADBUSY|SVs_PADMY|SVs_PADTMP);
826 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
827 case SVt_PVAV: *(SV**)ptr = (SV*)newAV(); break;
828 case SVt_PVHV: *(SV**)ptr = (SV*)newHV(); break;
829 default: *(SV**)ptr = NEWSV(0,0); break;
831 SvREFCNT_dec(sv); /* Cast current value to the winds. */
832 SvFLAGS(*(SV**)ptr) |= padflags; /* preserve pad nature */
839 (void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
843 case SAVEt_DESTRUCTOR:
847 case SAVEt_DESTRUCTOR_X:
849 (*SSPOPDXPTR)(aTHXo_ ptr);
851 case SAVEt_REGCONTEXT:
854 PL_savestack_ix -= i; /* regexp must have croaked */
856 case SAVEt_STACK_POS: /* Position on Perl stack */
858 PL_stack_sp = PL_stack_base + i;
860 case SAVEt_AELEM: /* array element */
861 value = (SV*)SSPOPPTR;
864 ptr = av_fetch(av,i,1);
867 if (sv && sv != &PL_sv_undef) {
868 if (SvTIED_mg((SV*)av, 'P'))
869 (void)SvREFCNT_inc(sv);
877 case SAVEt_HELEM: /* hash element */
878 value = (SV*)SSPOPPTR;
881 ptr = hv_fetch_ent(hv, sv, 1, 0);
883 SV *oval = HeVAL((HE*)ptr);
884 if (oval && oval != &PL_sv_undef) {
885 ptr = &HeVAL((HE*)ptr);
886 if (SvTIED_mg((SV*)hv, 'P'))
887 (void)SvREFCNT_inc(*(SV**)ptr);
898 PL_op = (OP*)SSPOPPTR;
901 if (GvHV(PL_hintgv)) {
902 SvREFCNT_dec((SV*)GvHV(PL_hintgv));
903 GvHV(PL_hintgv) = NULL;
905 *(I32*)&PL_hints = (I32)SSPOPINT;
908 Perl_croak(aTHX_ "panic: leave_scope inconsistency");
914 Perl_cx_dump(pTHX_ PERL_CONTEXT *cx)
918 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]);
919 if (CxTYPE(cx) != CXt_SUBST) {
920 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
921 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop);
922 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
923 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
924 PerlIO_printf(Perl_debug_log, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
925 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm);
926 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
928 switch (CxTYPE(cx)) {
933 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%lx\n",
934 (long)cx->blk_sub.cv);
935 PerlIO_printf(Perl_debug_log, "BLK_SUB.GV = 0x%lx\n",
936 (long)cx->blk_sub.gv);
937 PerlIO_printf(Perl_debug_log, "BLK_SUB.DFOUTGV = 0x%lx\n",
938 (long)cx->blk_sub.dfoutgv);
939 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
940 (long)cx->blk_sub.olddepth);
941 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
942 (int)cx->blk_sub.hasargs);
945 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
946 (long)cx->blk_eval.old_in_eval);
947 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
948 PL_op_name[cx->blk_eval.old_op_type],
949 PL_op_desc[cx->blk_eval.old_op_type]);
950 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
951 cx->blk_eval.old_name);
952 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n",
953 (long)cx->blk_eval.old_eval_root);
957 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n",
959 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
960 (long)cx->blk_loop.resetsp);
961 PerlIO_printf(Perl_debug_log, "BLK_LOOP.REDO_OP = 0x%lx\n",
962 (long)cx->blk_loop.redo_op);
963 PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%lx\n",
964 (long)cx->blk_loop.next_op);
965 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LAST_OP = 0x%lx\n",
966 (long)cx->blk_loop.last_op);
967 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
968 (long)cx->blk_loop.iterix);
969 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%lx\n",
970 (long)cx->blk_loop.iterary);
971 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%lx\n",
972 (long)cx->blk_loop.itervar);
973 if (cx->blk_loop.itervar)
974 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%lx\n",
975 (long)cx->blk_loop.itersave);
976 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERLVAL = 0x%lx\n",
977 (long)cx->blk_loop.iterlval);
981 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
983 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
984 (long)cx->sb_maxiters);
985 PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n",
986 (long)cx->sb_rflags);
987 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
989 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
991 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%lx\n",
993 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%lx\n",
995 PerlIO_printf(Perl_debug_log, "SB_S = 0x%lx\n",
997 PerlIO_printf(Perl_debug_log, "SB_M = 0x%lx\n",
999 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%lx\n",
1000 (long)cx->sb_strend);
1001 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%lx\n",
1002 (long)cx->sb_rxres);
1005 #endif /* DEBUGGING */