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
18 static void setjmp_tryblock _((CPERLarg_ TRYVTBL *vtbl, void *locals));
21 install_tryblock_method(tryblock_f fn)
24 tryblock_function = fn;
26 tryblock_function = setjmp_tryblock;
30 stack_grow(SV **sp, SV **p, int n)
33 #if defined(DEBUGGING) && !defined(USE_THREADS)
34 static int growing = 0;
39 #ifndef STRESS_REALLOC
40 av_extend(curstack, (p - stack_base) + (n) + 128);
42 av_extend(curstack, (p - stack_base) + (n) + 1);
44 #if defined(DEBUGGING) && !defined(USE_THREADS)
50 #ifndef STRESS_REALLOC
51 #define GROW(old) ((old) * 3 / 2)
53 #define GROW(old) ((old) + 1)
57 new_stackinfo(I32 stitems, I32 cxitems)
61 New(56, si, 1, PERL_SI);
62 si->si_stack = newAV();
63 AvREAL_off(si->si_stack);
64 av_extend(si->si_stack, stitems > 0 ? stitems-1 : 0);
65 AvALLOC(si->si_stack)[0] = &sv_undef;
66 AvFILLp(si->si_stack) = 0;
69 si->si_cxmax = cxitems - 1;
71 si->si_type = SI_UNDEF;
72 New(56, si->si_cxstack, cxitems, PERL_CONTEXT);
80 cxstack_max = GROW(cxstack_max);
81 Renew(cxstack, cxstack_max + 1, PERL_CONTEXT); /* XXX should fix CXINC macro */
82 return cxstack_ix + 1;
86 push_return(OP *retop)
89 if (retstack_ix == retstack_max) {
90 retstack_max = GROW(retstack_max);
91 Renew(retstack, retstack_max, OP*);
93 retstack[retstack_ix++] = retop;
101 return retstack[--retstack_ix];
110 if (scopestack_ix == scopestack_max) {
111 scopestack_max = GROW(scopestack_max);
112 Renew(scopestack, scopestack_max, I32);
114 scopestack[scopestack_ix++] = savestack_ix;
122 I32 oldsave = scopestack[--scopestack_ix];
123 LEAVE_SCOPE(oldsave);
130 I32 oldmax = markstack_max - markstack;
131 I32 newmax = GROW(oldmax);
133 Renew(markstack, newmax, I32);
134 markstack_ptr = markstack + oldmax;
135 markstack_max = markstack + newmax;
142 savestack_max = GROW(savestack_max) + 4;
143 Renew(savestack, savestack_max, ANY);
152 /* XXX should tmps_floor live in cxstack? */
153 I32 myfloor = tmps_floor;
154 while (tmps_ix > myfloor) { /* clean up after last statement */
155 SV* sv = tmps_stack[tmps_ix];
156 tmps_stack[tmps_ix--] = Nullsv;
161 SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */
167 save_scalar_at(SV **sptr)
173 sv = *sptr = NEWSV(0,0);
174 if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
175 sv_upgrade(sv, SvTYPE(osv));
176 if (SvGMAGICAL(osv)) {
178 bool oldtainted = tainted;
180 if (tainting && tainted && (mg = mg_find(osv, 't'))) {
181 SAVESPTR(mg->mg_obj);
184 SvFLAGS(osv) |= (SvFLAGS(osv) &
185 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
186 tainted = oldtainted;
188 SvMAGIC(sv) = SvMAGIC(osv);
189 SvFLAGS(sv) |= SvMAGICAL(osv);
201 SV **sptr = &GvSV(gv);
203 SSPUSHPTR(SvREFCNT_inc(gv));
204 SSPUSHPTR(SvREFCNT_inc(*sptr));
206 return save_scalar_at(sptr);
210 save_svref(SV **sptr)
215 SSPUSHPTR(SvREFCNT_inc(*sptr));
216 SSPUSHINT(SAVEt_SVREF);
217 return save_scalar_at(sptr);
221 save_gp(GV *gv, I32 empty)
225 SSPUSHIV((IV)SvLEN(gv));
226 SvLEN(gv) = 0; /* forget that anything was allocated here */
227 SSPUSHIV((IV)SvCUR(gv));
228 SSPUSHPTR(SvPVX(gv));
230 SSPUSHPTR(SvREFCNT_inc(gv));
238 sub_generation++; /* taking a method out of circulation */
239 Newz(602, gp, 1, GP);
240 GvGP(gv) = gp_ref(gp);
241 GvSV(gv) = NEWSV(72,0);
242 GvLINE(gv) = curcop->cop_line;
258 if (!AvREAL(oav) && AvREIFY(oav))
265 GvAV(gv) = Null(AV*);
268 SvMAGIC(av) = SvMAGIC(oav);
269 SvFLAGS(av) |= SvMAGICAL(oav);
287 SSPUSHPTR(ohv = GvHVn(gv));
290 GvHV(gv) = Null(HV*);
293 SvMAGIC(hv) = SvMAGIC(ohv);
294 SvFLAGS(hv) |= SvMAGICAL(ohv);
305 save_item(register SV *item)
308 register SV *sv = NEWSV(0,0);
312 SSPUSHPTR(item); /* remember the pointer */
313 SSPUSHPTR(sv); /* remember the value */
314 SSPUSHINT(SAVEt_ITEM);
324 SSPUSHINT(SAVEt_INT);
328 save_long(long int *longp)
334 SSPUSHINT(SAVEt_LONG);
344 SSPUSHINT(SAVEt_I32);
354 SSPUSHINT(SAVEt_I16);
367 /* Cannot use save_sptr() to store a char* since the SV** cast will
368 * force word-alignment and we'll miss the pointer.
371 save_pptr(char **pptr)
377 SSPUSHINT(SAVEt_PPTR);
387 SSPUSHINT(SAVEt_SPTR);
391 save_threadsv(PADOFFSET i)
395 SV **svp = &THREADSV(i); /* XXX Change to save by offset */
396 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "save_threadsv %u: %p %p:%s\n",
397 i, svp, *svp, SvPEEK(*svp)));
401 croak("panic: save_threadsv called in non-threaded perl");
403 #endif /* USE_THREADS */
412 SSPUSHINT(SAVEt_NSTAB);
422 SSPUSHINT(SAVEt_HPTR);
432 SSPUSHINT(SAVEt_APTR);
441 SSPUSHINT(SAVEt_FREESV);
450 SSPUSHINT(SAVEt_FREEOP);
454 save_freepv(char *pv)
459 SSPUSHINT(SAVEt_FREEPV);
463 save_clearsv(SV **svp)
467 SSPUSHLONG((long)(svp-curpad));
468 SSPUSHINT(SAVEt_CLEARSV);
472 save_delete(HV *hv, char *key, I32 klen)
478 SSPUSHPTR(SvREFCNT_inc(hv));
479 SSPUSHINT(SAVEt_DELETE);
483 save_list(register SV **sarg, I32 maxsarg)
489 for (i = 1; i <= maxsarg; i++) {
491 sv_setsv(sv,sarg[i]);
493 SSPUSHPTR(sarg[i]); /* remember the pointer */
494 SSPUSHPTR(sv); /* remember the value */
495 SSPUSHINT(SAVEt_ITEM);
501 save_destructor(DESTRUCTORFUNC f, void* p)
503 save_destructor(void (*f) (void *), void *p)
510 SSPUSHINT(SAVEt_DESTRUCTOR);
514 save_aelem(AV *av, I32 idx, SV **sptr)
518 SSPUSHPTR(SvREFCNT_inc(av));
520 SSPUSHPTR(SvREFCNT_inc(*sptr));
521 SSPUSHINT(SAVEt_AELEM);
522 save_scalar_at(sptr);
526 save_helem(HV *hv, SV *key, SV **sptr)
530 SSPUSHPTR(SvREFCNT_inc(hv));
531 SSPUSHPTR(SvREFCNT_inc(key));
532 SSPUSHPTR(SvREFCNT_inc(*sptr));
533 SSPUSHINT(SAVEt_HELEM);
534 save_scalar_at(sptr);
547 leave_scope(I32 base)
559 croak("panic: corrupt saved stack index");
560 while (savestack_ix > base) {
562 case SAVEt_ITEM: /* normal string */
563 value = (SV*)SSPOPPTR;
565 sv_replace(sv,value);
570 case SAVEt_SV: /* scalar reference */
571 value = (SV*)SSPOPPTR;
576 case SAVEt_SVREF: /* scalar reference */
577 value = (SV*)SSPOPPTR;
581 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
582 "restore svref: %p %p:%s -> %p:%s\n",
583 ptr, sv, SvPEEK(sv), value, SvPEEK(value)));
584 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
585 SvTYPE(sv) != SVt_PVGV)
587 (void)SvUPGRADE(value, SvTYPE(sv));
588 SvMAGIC(value) = SvMAGIC(sv);
589 SvFLAGS(value) |= SvMAGICAL(sv);
593 else if (SvTYPE(value) >= SVt_PVMG && SvMAGIC(value) &&
594 SvTYPE(value) != SVt_PVGV)
596 SvFLAGS(value) |= (SvFLAGS(value) &
597 (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
598 SvMAGICAL_off(value);
608 case SAVEt_AV: /* array reference */
612 AV *goner = GvAV(gv);
613 SvMAGIC(av) = SvMAGIC(goner);
614 SvFLAGS(av) |= SvMAGICAL(goner);
615 SvMAGICAL_off(goner);
626 case SAVEt_HV: /* hash reference */
630 HV *goner = GvHV(gv);
631 SvMAGIC(hv) = SvMAGIC(goner);
632 SvFLAGS(hv) |= SvMAGICAL(goner);
633 SvMAGICAL_off(goner);
644 case SAVEt_INT: /* int reference */
646 *(int*)ptr = (int)SSPOPINT;
648 case SAVEt_LONG: /* long reference */
650 *(long*)ptr = (long)SSPOPLONG;
652 case SAVEt_I32: /* I32 reference */
654 *(I32*)ptr = (I32)SSPOPINT;
656 case SAVEt_I16: /* I16 reference */
658 *(I16*)ptr = (I16)SSPOPINT;
660 case SAVEt_IV: /* IV reference */
662 *(IV*)ptr = (IV)SSPOPIV;
664 case SAVEt_SPTR: /* SV* reference */
666 *(SV**)ptr = (SV*)SSPOPPTR;
668 case SAVEt_PPTR: /* char* reference */
670 *(char**)ptr = (char*)SSPOPPTR;
672 case SAVEt_HPTR: /* HV* reference */
674 *(HV**)ptr = (HV*)SSPOPPTR;
676 case SAVEt_APTR: /* AV* reference */
678 *(AV**)ptr = (AV*)SSPOPPTR;
682 (void)sv_clear((SV*)gv);
684 case SAVEt_GP: /* scalar reference */
687 if (SvPOK(gv) && SvLEN(gv) > 0) {
690 SvPVX(gv) = (char *)SSPOPPTR;
691 SvCUR(gv) = (STRLEN)SSPOPIV;
692 SvLEN(gv) = (STRLEN)SSPOPIV;
696 sub_generation++; /* putting a method back into circulation */
701 SvREFCNT_dec((SV*)ptr);
706 curpad = AvARRAY(comppad);
711 Safefree((char*)ptr);
714 ptr = (void*)&curpad[SSPOPLONG];
716 /* Can clear pad variable in place? */
717 if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
718 if (SvTHINKFIRST(sv)) {
720 croak("panic: leave_scope clearsv");
727 switch (SvTYPE(sv)) {
737 croak("panic: leave_scope pad code");
749 else { /* Someone has a claim on this, so abandon it. */
750 U32 padflags = SvFLAGS(sv) & (SVs_PADBUSY|SVs_PADMY|SVs_PADTMP);
751 switch (SvTYPE(sv)) { /* Console ourselves with a new value */
752 case SVt_PVAV: *(SV**)ptr = (SV*)newAV(); break;
753 case SVt_PVHV: *(SV**)ptr = (SV*)newHV(); break;
754 default: *(SV**)ptr = NEWSV(0,0); break;
756 SvREFCNT_dec(sv); /* Cast current value to the winds. */
757 SvFLAGS(*(SV**)ptr) |= padflags; /* preserve pad nature */
764 (void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
768 case SAVEt_DESTRUCTOR:
770 (CALLDESTRUCTOR)(ptr);
772 case SAVEt_REGCONTEXT:
774 savestack_ix -= i; /* regexp must have croaked */
776 case SAVEt_STACK_POS: /* Position on Perl stack */
778 stack_sp = stack_base + i;
780 case SAVEt_AELEM: /* array element */
781 value = (SV*)SSPOPPTR;
784 ptr = av_fetch(av,i,1);
787 if (sv && sv != &sv_undef) {
788 if (SvRMAGICAL(av) && mg_find((SV*)av, 'P'))
789 (void)SvREFCNT_inc(sv);
797 case SAVEt_HELEM: /* hash element */
798 value = (SV*)SSPOPPTR;
801 ptr = hv_fetch_ent(hv, sv, 1, 0);
803 SV *oval = HeVAL((HE*)ptr);
804 if (oval && oval != &sv_undef) {
805 ptr = &HeVAL((HE*)ptr);
806 if (SvRMAGICAL(hv) && mg_find((SV*)hv, 'P'))
807 (void)SvREFCNT_inc(*(SV**)ptr);
821 croak("panic: leave_scope inconsistency");
827 cx_dump(PERL_CONTEXT *cx)
831 PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), block_type[cx->cx_type]);
832 if (cx->cx_type != CXt_SUBST) {
833 PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
834 PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop);
835 PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
836 PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
837 PerlIO_printf(Perl_debug_log, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
838 PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm);
839 PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
841 switch (cx->cx_type) {
846 PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%lx\n",
847 (long)cx->blk_sub.cv);
848 PerlIO_printf(Perl_debug_log, "BLK_SUB.GV = 0x%lx\n",
849 (long)cx->blk_sub.gv);
850 PerlIO_printf(Perl_debug_log, "BLK_SUB.DFOUTGV = 0x%lx\n",
851 (long)cx->blk_sub.dfoutgv);
852 PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
853 (long)cx->blk_sub.olddepth);
854 PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
855 (int)cx->blk_sub.hasargs);
858 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
859 (long)cx->blk_eval.old_in_eval);
860 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
861 op_name[cx->blk_eval.old_op_type],
862 op_desc[cx->blk_eval.old_op_type]);
863 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
864 cx->blk_eval.old_name);
865 PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n",
866 (long)cx->blk_eval.old_eval_root);
870 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n",
872 PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
873 (long)cx->blk_loop.resetsp);
874 PerlIO_printf(Perl_debug_log, "BLK_LOOP.REDO_OP = 0x%lx\n",
875 (long)cx->blk_loop.redo_op);
876 PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%lx\n",
877 (long)cx->blk_loop.next_op);
878 PerlIO_printf(Perl_debug_log, "BLK_LOOP.LAST_OP = 0x%lx\n",
879 (long)cx->blk_loop.last_op);
880 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
881 (long)cx->blk_loop.iterix);
882 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%lx\n",
883 (long)cx->blk_loop.iterary);
884 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%lx\n",
885 (long)cx->blk_loop.itervar);
886 if (cx->blk_loop.itervar)
887 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%lx\n",
888 (long)cx->blk_loop.itersave);
889 PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERLVAL = 0x%lx\n",
890 (long)cx->blk_loop.iterlval);
894 PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
896 PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
897 (long)cx->sb_maxiters);
898 PerlIO_printf(Perl_debug_log, "SB_SAFEBASE = %ld\n",
899 (long)cx->sb_safebase);
900 PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
902 PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
904 PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%lx\n",
906 PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%lx\n",
908 PerlIO_printf(Perl_debug_log, "SB_S = 0x%lx\n",
910 PerlIO_printf(Perl_debug_log, "SB_M = 0x%lx\n",
912 PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%lx\n",
913 (long)cx->sb_strend);
914 PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%lx\n",
918 #endif /* DEBUGGING */
923 /* make 'static' once JMPENV_PUSH is no longer used (see scope.h) XXX */
925 setjmp_jump(CPERLarg)
928 PerlProc_longjmp(((SETJMPENV*)top_env)->je_buf, 1);
932 setjmp_tryblock(CPERLarg_ TRYVTBL *vtbl, void *locals)
937 JMPENV_INIT(je, setjmp_jump);
938 PerlProc_setjmp(je.je_buf, 1);
940 jmpstat = JMPENV_STAT(je);
943 assert(vtbl->try_normal[0]);
944 (*vtbl->try_normal[0])(PERL_OBJECT_THIS_ locals);
947 if (vtbl->try_exception[0])
948 (*vtbl->try_exception[0])(PERL_OBJECT_THIS_ locals);
951 if (vtbl->try_myexit[0])
952 (*vtbl->try_myexit[0])(PERL_OBJECT_THIS_ locals);
955 if (jmpstat != JMP_ABNORMAL)
956 PerlIO_printf(PerlIO_stderr(),
957 "JMPENV_JUMP(%d) is bogus\n", jmpstat);
958 if (vtbl->try_abnormal[0])
959 (*vtbl->try_abnormal[0])(PERL_OBJECT_THIS_ locals);
963 switch (JMPENV_STAT(je)) {
965 if (vtbl->try_normal[1])
966 (*vtbl->try_normal[1])(PERL_OBJECT_THIS_ locals);
969 if (vtbl->try_exception[1])
970 (*vtbl->try_exception[1])(PERL_OBJECT_THIS_ locals);
973 if (vtbl->try_myexit[1])
974 (*vtbl->try_myexit[1])(PERL_OBJECT_THIS_ locals);
977 if (jmpstat != JMP_ABNORMAL)
978 PerlIO_printf(PerlIO_stderr(),
979 "JMPENV_JUMP(%d) is bogus\n", jmpstat);
980 if (vtbl->try_abnormal[1])
981 (*vtbl->try_abnormal[1])(PERL_OBJECT_THIS_ locals);