3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 * 2000, 2001, 2002, 2003, 2004, 2005, by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
12 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
13 * of your inquisitiveness, I shall spend all the rest of my days answering
14 * you. What more do you want to know?'
15 * 'The names of all the stars, and of all living things, and the whole
16 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
23 A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
24 It is a structure that holds a pointer to a scalar, an array, a hash etc,
25 corresponding to $foo, @foo, %foo.
27 GVs are usually found as values in stashes (symbol table hashes) where
28 Perl stores its global variables.
37 static const char S_autoload[] = "AUTOLOAD";
38 static const STRLEN S_autolen = sizeof(S_autoload)-1;
41 #ifdef PERL_DONT_CREATE_GVSV
43 Perl_gv_SVadd(pTHX_ GV *gv)
45 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
46 Perl_croak(aTHX_ "Bad symbol for scalar");
48 GvSV(gv) = NEWSV(72,0);
54 Perl_gv_AVadd(pTHX_ register GV *gv)
56 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
57 Perl_croak(aTHX_ "Bad symbol for array");
64 Perl_gv_HVadd(pTHX_ register GV *gv)
66 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
67 Perl_croak(aTHX_ "Bad symbol for hash");
74 Perl_gv_IOadd(pTHX_ register GV *gv)
76 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
77 Perl_croak(aTHX_ "Bad symbol for filehandle");
79 #ifdef GV_UNIQUE_CHECK
81 Perl_croak(aTHX_ "Bad symbol for filehandle (GV is unique)");
90 Perl_gv_fetchfile(pTHX_ const char *name)
100 tmplen = strlen(name) + 2;
101 if (tmplen < sizeof smallbuf)
104 Newx(tmpbuf, tmplen + 1, char);
105 /* This is where the debugger's %{"::_<$filename"} hash is created */
108 memcpy(tmpbuf + 2, name, tmplen - 1);
109 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
111 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
112 #ifdef PERL_DONT_CREATE_GVSV
113 GvSV(gv) = newSVpvn(name, tmplen - 2);
115 sv_setpvn(GvSV(gv), name, tmplen - 2);
118 hv_magic(GvHVn(gv_AVadd(gv)), Nullgv, PERL_MAGIC_dbfile);
120 if (tmpbuf != smallbuf)
126 Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
130 const bool doproto = SvTYPE(gv) > SVt_NULL;
131 const char * const proto = (doproto && SvPOK(gv)) ? SvPVX_const(gv) : NULL;
133 sv_upgrade((SV*)gv, SVt_PVGV);
140 Safefree(SvPVX_mutable(gv));
143 GvGP(gv) = gp_ref(gp);
144 #ifdef PERL_DONT_CREATE_GVSV
147 GvSV(gv) = NEWSV(72,0);
149 GvLINE(gv) = CopLINE(PL_curcop);
150 /* XXX Ideally this cast would be replaced with a change to const char*
152 GvFILE(gv) = CopFILE(PL_curcop) ? CopFILE(PL_curcop) : (char *) "";
155 sv_magic((SV*)gv, (SV*)gv, PERL_MAGIC_glob, Nullch, 0);
158 Perl_sv_add_backref(aTHX_ (SV*)stash, (SV*)gv);
159 GvNAME(gv) = savepvn(name, len);
161 if (multi || doproto) /* doproto means it _was_ mentioned */
163 if (doproto) { /* Replicate part of newSUB here. */
166 /* XXX unsafe for threads if eval_owner isn't held */
167 (void) start_subparse(0,0); /* Create empty CV in compcv. */
168 GvCV(gv) = PL_compcv;
173 CvFILE_set_from_cop(GvCV(gv), PL_curcop);
174 CvSTASH(GvCV(gv)) = PL_curstash;
176 sv_setpv((SV*)GvCV(gv), proto);
183 S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
195 #ifdef PERL_DONT_CREATE_GVSV
207 =for apidoc gv_fetchmeth
209 Returns the glob with the given C<name> and a defined subroutine or
210 C<NULL>. The glob lives in the given C<stash>, or in the stashes
211 accessible via @ISA and UNIVERSAL::.
213 The argument C<level> should be either 0 or -1. If C<level==0>, as a
214 side-effect creates a glob with the given C<name> in the given C<stash>
215 which in the case of success contains an alias for the subroutine, and sets
216 up caching info for this glob. Similarly for all the searched stashes.
218 This function grants C<"SUPER"> token as a postfix of the stash name. The
219 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
220 visible to Perl code. So when calling C<call_sv>, you should not use
221 the GV directly; instead, you should use the method's CV, which can be
222 obtained from the GV with the C<GvCV> macro.
228 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
237 /* UNIVERSAL methods should be callable without a stash */
239 level = -1; /* probably appropriate */
240 if(!(stash = gv_stashpvn("UNIVERSAL", 9, FALSE)))
244 hvname = HvNAME_get(stash);
247 "Can't use anonymous symbol table for method lookup");
249 if ((level > 100) || (level < -100))
250 Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
253 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
255 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
260 if (SvTYPE(topgv) != SVt_PVGV)
261 gv_init(topgv, stash, name, len, TRUE);
262 if ((cv = GvCV(topgv))) {
263 /* If genuine method or valid cache entry, use it */
264 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
266 /* Stale cached entry: junk it */
268 GvCV(topgv) = cv = Nullcv;
271 else if (GvCVGEN(topgv) == PL_sub_generation)
272 return 0; /* cache indicates sub doesn't exist */
275 gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE);
276 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : Nullav;
278 /* create and re-create @.*::SUPER::ISA on demand */
279 if (!av || !SvMAGIC(av)) {
280 STRLEN packlen = HvNAMELEN_get(stash);
282 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
286 basestash = gv_stashpvn(hvname, packlen, TRUE);
287 gvp = (GV**)hv_fetch(basestash, "ISA", 3, FALSE);
288 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
289 gvp = (GV**)hv_fetch(stash, "ISA", 3, TRUE);
290 if (!gvp || !(gv = *gvp))
291 Perl_croak(aTHX_ "Cannot create %s::ISA", hvname);
292 if (SvTYPE(gv) != SVt_PVGV)
293 gv_init(gv, stash, "ISA", 3, TRUE);
294 SvREFCNT_dec(GvAV(gv));
295 GvAV(gv) = (AV*)SvREFCNT_inc(av);
301 SV** svp = AvARRAY(av);
302 /* NOTE: No support for tied ISA */
303 I32 items = AvFILLp(av) + 1;
305 SV* const sv = *svp++;
306 HV* const basestash = gv_stashsv(sv, FALSE);
308 if (ckWARN(WARN_MISC))
309 Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
313 gv = gv_fetchmeth(basestash, name, len,
314 (level >= 0) ? level + 1 : level - 1);
320 /* if at top level, try UNIVERSAL */
322 if (level == 0 || level == -1) {
323 HV* const lastchance = gv_stashpvn("UNIVERSAL", 9, FALSE);
326 if ((gv = gv_fetchmeth(lastchance, name, len,
327 (level >= 0) ? level + 1 : level - 1)))
331 * Cache method in topgv if:
332 * 1. topgv has no synonyms (else inheritance crosses wires)
333 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
336 GvREFCNT(topgv) == 1 &&
338 (CvROOT(cv) || CvXSUB(cv)))
340 if ((cv = GvCV(topgv)))
342 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
343 GvCVGEN(topgv) = PL_sub_generation;
347 else if (topgv && GvREFCNT(topgv) == 1) {
348 /* cache the fact that the method is not defined */
349 GvCVGEN(topgv) = PL_sub_generation;
358 =for apidoc gv_fetchmeth_autoload
360 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
361 Returns a glob for the subroutine.
363 For an autoloaded subroutine without a GV, will create a GV even
364 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
365 of the result may be zero.
371 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
373 GV *gv = gv_fetchmeth(stash, name, len, level);
380 return Nullgv; /* UNIVERSAL::AUTOLOAD could cause trouble */
381 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
383 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
386 if (!(CvROOT(cv) || CvXSUB(cv)))
388 /* Have an autoload */
389 if (level < 0) /* Cannot do without a stub */
390 gv_fetchmeth(stash, name, len, 0);
391 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
400 =for apidoc gv_fetchmethod
402 See L<gv_fetchmethod_autoload>.
408 Perl_gv_fetchmethod(pTHX_ HV *stash, const char *name)
410 return gv_fetchmethod_autoload(stash, name, TRUE);
414 =for apidoc gv_fetchmethod_autoload
416 Returns the glob which contains the subroutine to call to invoke the method
417 on the C<stash>. In fact in the presence of autoloading this may be the
418 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
421 The third parameter of C<gv_fetchmethod_autoload> determines whether
422 AUTOLOAD lookup is performed if the given method is not present: non-zero
423 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
424 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
425 with a non-zero C<autoload> parameter.
427 These functions grant C<"SUPER"> token as a prefix of the method name. Note
428 that if you want to keep the returned glob for a long time, you need to
429 check for it being "AUTOLOAD", since at the later time the call may load a
430 different subroutine due to $AUTOLOAD changing its value. Use the glob
431 created via a side effect to do this.
433 These functions have the same side-effects and as C<gv_fetchmeth> with
434 C<level==0>. C<name> should be writable if contains C<':'> or C<'
435 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
436 C<call_sv> apply equally to these functions.
442 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
444 register const char *nend;
445 const char *nsplit = 0;
449 if (stash && SvTYPE(stash) < SVt_PVHV)
452 for (nend = name; *nend; nend++) {
455 else if (*nend == ':' && *(nend + 1) == ':')
459 const char * const origname = name;
463 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
464 /* ->SUPER::method should really be looked up in original stash */
465 SV *tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
466 CopSTASHPV(PL_curcop)));
467 /* __PACKAGE__::SUPER stash should be autovivified */
468 stash = gv_stashpvn(SvPVX_const(tmpstr), SvCUR(tmpstr), TRUE);
469 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
470 origname, HvNAME_get(stash), name) );
473 /* don't autovifify if ->NoSuchStash::method */
474 stash = gv_stashpvn(origname, nsplit - origname, FALSE);
476 /* however, explicit calls to Pkg::SUPER::method may
477 happen, and may require autovivification to work */
478 if (!stash && (nsplit - origname) >= 7 &&
479 strnEQ(nsplit - 7, "::SUPER", 7) &&
480 gv_stashpvn(origname, nsplit - origname - 7, FALSE))
481 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
486 gv = gv_fetchmeth(stash, name, nend - name, 0);
488 if (strEQ(name,"import") || strEQ(name,"unimport"))
489 gv = (GV*)&PL_sv_yes;
491 gv = gv_autoload4(ostash, name, nend - name, TRUE);
494 CV* const cv = GvCV(gv);
495 if (!CvROOT(cv) && !CvXSUB(cv)) {
503 if (GvCV(stubgv) != cv) /* orphaned import */
506 autogv = gv_autoload4(GvSTASH(stubgv),
507 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
517 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
525 const char *packname = "";
528 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
531 if (SvTYPE(stash) < SVt_PVHV) {
532 packname = SvPV_const((SV*)stash, packname_len);
536 packname = HvNAME_get(stash);
537 packname_len = HvNAMELEN_get(stash);
540 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
544 if (!(CvROOT(cv) || CvXSUB(cv)))
548 * Inheriting AUTOLOAD for non-methods works ... for now.
550 if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
551 && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)
553 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
554 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
555 packname, (int)len, name);
558 /* rather than lookup/init $AUTOLOAD here
559 * only to have the XSUB do another lookup for $AUTOLOAD
560 * and split that value on the last '::',
561 * pass along the same data via some unused fields in the CV
564 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
570 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
571 * The subroutine's original name may not be "AUTOLOAD", so we don't
572 * use that, but for lack of anything better we will use the sub's
573 * original package to look up $AUTOLOAD.
575 varstash = GvSTASH(CvGV(cv));
576 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
580 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
581 #ifdef PERL_DONT_CREATE_GVSV
582 GvSV(vargv) = NEWSV(72,0);
586 varsv = GvSVn(vargv);
587 sv_setpvn(varsv, packname, packname_len);
588 sv_catpvn(varsv, "::", 2);
589 sv_catpvn(varsv, name, len);
590 SvTAINTED_off(varsv);
594 /* The "gv" parameter should be the glob known to Perl code as *!
595 * The scalar must already have been magicalized.
598 S_require_errno(pTHX_ GV *gv)
601 HV* stash = gv_stashpvn("Errno",5,FALSE);
603 if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
607 save_scalar(gv); /* keep the value of $! */
608 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
609 newSVpvn("Errno",5), Nullsv);
612 stash = gv_stashpvn("Errno",5,FALSE);
613 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
614 Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available");
619 =for apidoc gv_stashpv
621 Returns a pointer to the stash for a specified package. C<name> should
622 be a valid UTF-8 string and must be null-terminated. If C<create> is set
623 then the package will be created if it does not already exist. If C<create>
624 is not set and the package does not exist then NULL is returned.
630 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
632 return gv_stashpvn(name, strlen(name), create);
636 =for apidoc gv_stashpvn
638 Returns a pointer to the stash for a specified package. C<name> should
639 be a valid UTF-8 string. The C<namelen> parameter indicates the length of
640 the C<name>, in bytes. If C<create> is set then the package will be
641 created if it does not already exist. If C<create> is not set and the
642 package does not exist then NULL is returned.
648 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
655 if (namelen + 3 < sizeof smallbuf)
658 Newx(tmpbuf, namelen + 3, char);
659 Copy(name,tmpbuf,namelen,char);
660 tmpbuf[namelen++] = ':';
661 tmpbuf[namelen++] = ':';
662 tmpbuf[namelen] = '\0';
663 tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV);
664 if (tmpbuf != smallbuf)
669 GvHV(tmpgv) = newHV();
671 if (!HvNAME_get(stash))
672 hv_name_set(stash, name, namelen, 0);
677 =for apidoc gv_stashsv
679 Returns a pointer to the stash for a specified package, which must be a
680 valid UTF-8 string. See C<gv_stashpv>.
686 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
689 const char * const ptr = SvPV_const(sv,len);
690 return gv_stashpvn(ptr, len, create);
695 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
696 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
700 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
702 const char * const nambeg = SvPV_const(name, len);
703 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
707 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
710 register const char *name = nambeg;
714 register const char *namend;
716 const I32 add = flags & ~SVf_UTF8;
718 PERL_UNUSED_ARG(full_len);
720 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
723 for (namend = name; *namend; namend++) {
724 if ((*namend == ':' && namend[1] == ':')
725 || (*namend == '\'' && namend[1]))
729 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
737 if (len + 3 < sizeof (smallbuf))
740 Newx(tmpbuf, len+3, char);
741 Copy(name, tmpbuf, len, char);
745 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
746 gv = gvp ? *gvp : Nullgv;
747 if (gv && gv != (GV*)&PL_sv_undef) {
748 if (SvTYPE(gv) != SVt_PVGV)
749 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
753 if (tmpbuf != smallbuf)
755 if (!gv || gv == (GV*)&PL_sv_undef)
758 if (!(stash = GvHV(gv)))
759 stash = GvHV(gv) = newHV();
761 if (!HvNAME_get(stash))
762 hv_name_set(stash, nambeg, namend - nambeg, 0);
770 return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE);
775 /* No stash in name, so see how we can default */
778 if (isIDFIRST_lazy(name)) {
781 /* name is always \0 terminated, and initial \0 wouldn't return
782 true from isIDFIRST_lazy, so we know that name[1] is defined */
789 if (strEQ(name, "INC") || strEQ(name, "ENV"))
793 if (strEQ(name, "SIG"))
797 if (strEQ(name, "STDIN") || strEQ(name, "STDOUT") ||
798 strEQ(name, "STDERR"))
802 if (strEQ(name, "ARGV") || strEQ(name, "ARGVOUT"))
809 else if (IN_PERL_COMPILETIME) {
811 if (add && (PL_hints & HINT_STRICT_VARS) &&
812 sv_type != SVt_PVCV &&
813 sv_type != SVt_PVGV &&
814 sv_type != SVt_PVFM &&
815 sv_type != SVt_PVIO &&
816 !(len == 1 && sv_type == SVt_PV &&
817 (*name == 'a' || *name == 'b')) )
819 gvp = (GV**)hv_fetch(stash,name,len,0);
821 *gvp == (GV*)&PL_sv_undef ||
822 SvTYPE(*gvp) != SVt_PVGV)
826 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
827 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
828 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
830 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
831 sv_type == SVt_PVAV ? '@' :
832 sv_type == SVt_PVHV ? '%' : '$',
835 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
841 stash = CopSTASH(PL_curcop);
847 /* By this point we should have a stash and a name */
851 SV * const err = Perl_mess(aTHX_
852 "Global symbol \"%s%s\" requires explicit package name",
853 (sv_type == SVt_PV ? "$"
854 : sv_type == SVt_PVAV ? "@"
855 : sv_type == SVt_PVHV ? "%"
857 if (USE_UTF8_IN_NAMES)
860 stash = GvHV(gv_fetchpv("<none>::", GV_ADDMULTI, SVt_PVHV));
866 if (!SvREFCNT(stash)) /* symbol table under destruction */
869 gvp = (GV**)hv_fetch(stash,name,len,add);
870 if (!gvp || *gvp == (GV*)&PL_sv_undef)
873 if (SvTYPE(gv) == SVt_PVGV) {
876 gv_init_sv(gv, sv_type);
877 if (*name=='!' && sv_type == SVt_PVHV && len==1)
881 } else if (add & GV_NOINIT) {
885 /* Adding a new symbol */
887 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
888 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
889 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
890 gv_init_sv(gv, sv_type);
892 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
893 : (PL_dowarn & G_WARN_ON ) ) )
896 /* set up magic where warranted */
900 /* Nothing else to do.
901 The compiler will probably turn the switch statement into a
902 branch table. Make sure we avoid even that small overhead for
903 the common case of lower case variable names. */
907 const char * const name2 = name + 1;
910 if (strEQ(name2, "RGV")) {
911 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
915 if (strnEQ(name2, "XPORT", 5))
919 if (strEQ(name2, "SA")) {
920 AV* const av = GvAVn(gv);
922 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, Nullch, 0);
923 /* NOTE: No support for tied ISA */
924 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
925 && AvFILLp(av) == -1)
928 av_push(av, newSVpvn(pname = "NDBM_File",9));
929 gv_stashpvn(pname, 9, TRUE);
930 av_push(av, newSVpvn(pname = "DB_File",7));
931 gv_stashpvn(pname, 7, TRUE);
932 av_push(av, newSVpvn(pname = "GDBM_File",9));
933 gv_stashpvn(pname, 9, TRUE);
934 av_push(av, newSVpvn(pname = "SDBM_File",9));
935 gv_stashpvn(pname, 9, TRUE);
936 av_push(av, newSVpvn(pname = "ODBM_File",9));
937 gv_stashpvn(pname, 9, TRUE);
942 if (strEQ(name2, "VERLOAD")) {
943 HV* const hv = GvHVn(gv);
945 hv_magic(hv, Nullgv, PERL_MAGIC_overload);
949 if (strEQ(name2, "IG")) {
953 Newxz(PL_psig_ptr, SIG_SIZE, SV*);
954 Newxz(PL_psig_name, SIG_SIZE, SV*);
955 Newxz(PL_psig_pend, SIG_SIZE, int);
959 hv_magic(hv, Nullgv, PERL_MAGIC_sig);
960 for (i = 1; i < SIG_SIZE; i++) {
961 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
963 sv_setsv(*init, &PL_sv_undef);
971 if (strEQ(name2, "ERSION"))
974 case '\003': /* $^CHILD_ERROR_NATIVE */
975 if (strEQ(name2, "HILD_ERROR_NATIVE"))
978 case '\005': /* $^ENCODING */
979 if (strEQ(name2, "NCODING"))
982 case '\017': /* $^OPEN */
983 if (strEQ(name2, "PEN"))
986 case '\024': /* ${^TAINT} */
987 if (strEQ(name2, "AINT"))
990 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
991 if (strEQ(name2, "NICODE"))
993 if (strEQ(name2, "TF8LOCALE"))
996 case '\027': /* $^WARNING_BITS */
997 if (strEQ(name2, "ARNING_BITS"))
1010 /* ensures variable is only digits */
1011 /* ${"1foo"} fails this test (and is thus writeable) */
1012 /* added by japhy, but borrowed from is_gv_magical */
1013 const char *end = name + len;
1014 while (--end > name) {
1015 if (!isDIGIT(*end)) return gv;
1022 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1023 be case '\0' in this switch statement (ie a default case) */
1029 sv_type == SVt_PVAV ||
1030 sv_type == SVt_PVHV ||
1031 sv_type == SVt_PVCV ||
1032 sv_type == SVt_PVFM ||
1035 PL_sawampersand = TRUE;
1039 sv_setpv(GvSVn(gv),PL_chopset);
1043 #ifdef COMPLEX_STATUS
1044 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1050 /* If %! has been used, automatically load Errno.pm.
1051 The require will itself set errno, so in order to
1052 preserve its value we have to set up the magic
1053 now (rather than going to magicalize)
1056 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1058 if (sv_type == SVt_PVHV)
1064 AV* const av = GvAVn(gv);
1065 sv_magic((SV*)av, Nullsv, PERL_MAGIC_regdata, Nullch, 0);
1071 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1072 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1073 "$%c is no longer supported", *name);
1076 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1081 AV* const av = GvAVn(gv);
1082 sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, Nullch, 0);
1086 case '\023': /* $^S */
1097 SvREADONLY_on(GvSVn(gv));
1112 case '\001': /* $^A */
1113 case '\003': /* $^C */
1114 case '\004': /* $^D */
1115 case '\005': /* $^E */
1116 case '\006': /* $^F */
1117 case '\010': /* $^H */
1118 case '\011': /* $^I, NOT \t in EBCDIC */
1119 case '\016': /* $^N */
1120 case '\017': /* $^O */
1121 case '\020': /* $^P */
1122 case '\024': /* $^T */
1123 case '\027': /* $^W */
1125 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1128 case '\014': /* $^L */
1129 sv_setpvn(GvSVn(gv),"\f",1);
1130 PL_formfeed = GvSVn(gv);
1133 sv_setpvn(GvSVn(gv),"\034",1);
1137 SV * const sv = GvSVn(gv);
1138 if (!sv_derived_from(PL_patchlevel, "version"))
1139 (void *)upg_version(PL_patchlevel);
1140 GvSV(gv) = vnumify(PL_patchlevel);
1141 SvREADONLY_on(GvSV(gv));
1145 case '\026': /* $^V */
1147 SV * const sv = GvSVn(gv);
1148 GvSV(gv) = new_version(PL_patchlevel);
1149 SvREADONLY_on(GvSV(gv));
1159 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1163 const HV * const hv = GvSTASH(gv);
1168 sv_setpv(sv, prefix ? prefix : "");
1170 name = HvNAME_get(hv);
1172 namelen = HvNAMELEN_get(hv);
1178 if (keepmain || strNE(name, "main")) {
1179 sv_catpvn(sv,name,namelen);
1180 sv_catpvn(sv,"::", 2);
1182 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1186 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1188 const GV * const egv = GvEGV(gv);
1189 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1196 IO * const io = (IO*)NEWSV(0,0);
1198 sv_upgrade((SV *)io,SVt_PVIO);
1199 /* This used to read SvREFCNT(io) = 1;
1200 It's not clear why the reference count needed an explicit reset. NWC
1202 assert (SvREFCNT(io) == 1);
1204 /* Clear the stashcache because a new IO could overrule a package name */
1205 hv_clear(PL_stashcache);
1206 iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV);
1207 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1208 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1209 iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV);
1210 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1215 Perl_gv_check(pTHX_ HV *stash)
1219 if (!HvARRAY(stash))
1221 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1223 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1226 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1227 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1229 if (hv != PL_defstash && hv != stash)
1230 gv_check(hv); /* nested package */
1232 else if (isALPHA(*HeKEY(entry))) {
1234 gv = (GV*)HeVAL(entry);
1235 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1238 /* performance hack: if filename is absolute and it's a standard
1239 * module, don't bother warning */
1240 #ifdef MACOS_TRADITIONAL
1241 # define LIB_COMPONENT ":lib:"
1243 # define LIB_COMPONENT "/lib/"
1246 && PERL_FILE_IS_ABSOLUTE(file)
1247 && (instr(file, LIB_COMPONENT) || instr(file, ".pm")))
1251 CopLINE_set(PL_curcop, GvLINE(gv));
1253 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1255 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1257 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1258 "Name \"%s::%s\" used only once: possible typo",
1259 HvNAME_get(stash), GvNAME(gv));
1266 Perl_newGVgen(pTHX_ const char *pack)
1268 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1272 /* hopefully this is only called on local symbol table entries */
1275 Perl_gp_ref(pTHX_ GP *gp)
1282 /* multi-named GPs cannot be used for method cache */
1283 SvREFCNT_dec(gp->gp_cv);
1288 /* Adding a new name to a subroutine invalidates method cache */
1289 PL_sub_generation++;
1296 Perl_gp_free(pTHX_ GV *gv)
1300 if (!gv || !(gp = GvGP(gv)))
1302 if (gp->gp_refcnt == 0) {
1303 if (ckWARN_d(WARN_INTERNAL))
1304 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1305 "Attempt to free unreferenced glob pointers"
1306 pTHX__FORMAT pTHX__VALUE);
1310 /* Deleting the name of a subroutine invalidates method cache */
1311 PL_sub_generation++;
1313 if (--gp->gp_refcnt > 0) {
1314 if (gp->gp_egv == gv)
1319 if (gp->gp_sv) SvREFCNT_dec(gp->gp_sv);
1320 if (gp->gp_av) SvREFCNT_dec(gp->gp_av);
1321 /* FIXME - another reference loop GV -> symtab -> GV ?
1322 Somehow gp->gp_hv can end up pointing at freed garbage. */
1323 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1324 const char *hvname = HvNAME_get(gp->gp_hv);
1325 if (PL_stashcache && hvname)
1326 hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv),
1328 SvREFCNT_dec(gp->gp_hv);
1330 if (gp->gp_io) SvREFCNT_dec(gp->gp_io);
1331 if (gp->gp_cv) SvREFCNT_dec(gp->gp_cv);
1332 if (gp->gp_form) SvREFCNT_dec(gp->gp_form);
1339 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1341 AMT * const amtp = (AMT*)mg->mg_ptr;
1342 PERL_UNUSED_ARG(sv);
1344 if (amtp && AMT_AMAGIC(amtp)) {
1346 for (i = 1; i < NofAMmeth; i++) {
1347 CV * const cv = amtp->table[i];
1349 SvREFCNT_dec((SV *) cv);
1350 amtp->table[i] = Nullcv;
1357 /* Updates and caches the CV's */
1360 Perl_Gv_AMupdate(pTHX_ HV *stash)
1362 MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1363 AMT * const amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
1366 if (mg && amtp->was_ok_am == PL_amagic_generation
1367 && amtp->was_ok_sub == PL_sub_generation)
1368 return (bool)AMT_OVERLOADED(amtp);
1369 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1371 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1374 amt.was_ok_am = PL_amagic_generation;
1375 amt.was_ok_sub = PL_sub_generation;
1376 amt.fallback = AMGfallNO;
1380 int filled = 0, have_ovl = 0;
1383 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1385 /* Try to find via inheritance. */
1386 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1387 SV * const sv = gv ? GvSV(gv) : NULL;
1391 lim = DESTROY_amg; /* Skip overloading entries. */
1392 #ifdef PERL_DONT_CREATE_GVSV
1394 /* Equivalent to !SvTRUE and !SvOK */
1397 else if (SvTRUE(sv))
1398 amt.fallback=AMGfallYES;
1400 amt.fallback=AMGfallNEVER;
1402 for (i = 1; i < lim; i++)
1403 amt.table[i] = Nullcv;
1404 for (; i < NofAMmeth; i++) {
1405 const char *cooky = PL_AMG_names[i];
1406 /* Human-readable form, for debugging: */
1407 const char *cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1408 const STRLEN l = strlen(cooky);
1410 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1411 cp, HvNAME_get(stash)) );
1412 /* don't fill the cache while looking up!
1413 Creation of inheritance stubs in intermediate packages may
1414 conflict with the logic of runtime method substitution.
1415 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1416 then we could have created stubs for "(+0" in A and C too.
1417 But if B overloads "bool", we may want to use it for
1418 numifying instead of C's "+0". */
1419 if (i >= DESTROY_amg)
1420 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1421 else /* Autoload taken care of below */
1422 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1424 if (gv && (cv = GvCV(gv))) {
1426 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1427 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1428 /* This is a hack to support autoloading..., while
1429 knowing *which* methods were declared as overloaded. */
1430 /* GvSV contains the name of the method. */
1432 SV *gvsv = GvSV(gv);
1434 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1435 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1436 GvSV(gv), cp, hvname) );
1437 if (!gvsv || !SvPOK(gvsv)
1438 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1441 /* Can be an import stub (created by "can"). */
1442 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1443 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1444 "in package \"%.256s\"",
1445 (GvCVGEN(gv) ? "Stub found while resolving"
1449 cv = GvCV(gv = ngv);
1451 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1452 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1453 GvNAME(CvGV(cv))) );
1455 if (i < DESTROY_amg)
1457 } else if (gv) { /* Autoloaded... */
1461 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1464 AMT_AMAGIC_on(&amt);
1466 AMT_OVERLOADED_on(&amt);
1467 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1468 (char*)&amt, sizeof(AMT));
1472 /* Here we have no table: */
1474 AMT_AMAGIC_off(&amt);
1475 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1476 (char*)&amt, sizeof(AMTS));
1482 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1487 if (!stash || !HvNAME_get(stash))
1489 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1493 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1495 amtp = (AMT*)mg->mg_ptr;
1496 if ( amtp->was_ok_am != PL_amagic_generation
1497 || amtp->was_ok_sub != PL_sub_generation )
1499 if (AMT_AMAGIC(amtp)) {
1500 CV * const ret = amtp->table[id];
1501 if (ret && isGV(ret)) { /* Autoloading stab */
1502 /* Passing it through may have resulted in a warning
1503 "Inherited AUTOLOAD for a non-method deprecated", since
1504 our caller is going through a function call, not a method call.
1505 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1506 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1519 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1524 CV **cvp=NULL, **ocvp=NULL;
1525 AMT *amtp=NULL, *oamtp=NULL;
1526 int off = 0, off1, lr = 0, notfound = 0;
1527 int postpr = 0, force_cpy = 0;
1528 int assign = AMGf_assign & flags;
1529 const int assignshift = assign ? 1 : 0;
1534 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1535 && (stash = SvSTASH(SvRV(left)))
1536 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1537 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1538 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1540 && ((cv = cvp[off=method+assignshift])
1541 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1547 cv = cvp[off=method])))) {
1548 lr = -1; /* Call method for left argument */
1550 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1553 /* look for substituted methods */
1554 /* In all the covered cases we should be called with assign==0. */
1558 if ((cv = cvp[off=add_ass_amg])
1559 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1560 right = &PL_sv_yes; lr = -1; assign = 1;
1565 if ((cv = cvp[off = subtr_ass_amg])
1566 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1567 right = &PL_sv_yes; lr = -1; assign = 1;
1571 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1574 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1577 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1580 (void)((cv = cvp[off=bool__amg])
1581 || (cv = cvp[off=numer_amg])
1582 || (cv = cvp[off=string_amg]));
1588 * SV* ref causes confusion with the interpreter variable of
1591 SV* const tmpRef=SvRV(left);
1592 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1594 * Just to be extra cautious. Maybe in some
1595 * additional cases sv_setsv is safe, too.
1597 SV* const newref = newSVsv(tmpRef);
1598 SvOBJECT_on(newref);
1599 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1605 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1606 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1607 SV* const nullsv=sv_2mortal(newSViv(0));
1609 SV* const lessp = amagic_call(left,nullsv,
1610 lt_amg,AMGf_noright);
1611 logic = SvTRUE(lessp);
1613 SV* const lessp = amagic_call(left,nullsv,
1614 ncmp_amg,AMGf_noright);
1615 logic = (SvNV(lessp) < 0);
1618 if (off==subtr_amg) {
1629 if ((cv = cvp[off=subtr_amg])) {
1631 left = sv_2mortal(newSViv(0));
1636 case iter_amg: /* XXXX Eventually should do to_gv. */
1638 return NULL; /* Delegate operation to standard mechanisms. */
1646 return left; /* Delegate operation to standard mechanisms. */
1651 if (!cv) goto not_found;
1652 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1653 && (stash = SvSTASH(SvRV(right)))
1654 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1655 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1656 ? (amtp = (AMT*)mg->mg_ptr)->table
1658 && (cv = cvp[off=method])) { /* Method for right
1661 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1662 && (cvp=ocvp) && (lr = -1))
1663 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1664 && !(flags & AMGf_unary)) {
1665 /* We look for substitution for
1666 * comparison operations and
1668 if (method==concat_amg || method==concat_ass_amg
1669 || method==repeat_amg || method==repeat_ass_amg) {
1670 return NULL; /* Delegate operation to string conversion */
1680 postpr = 1; off=ncmp_amg; break;
1687 postpr = 1; off=scmp_amg; break;
1689 if (off != -1) cv = cvp[off];
1694 not_found: /* No method found, either report or croak */
1702 return left; /* Delegate operation to standard mechanisms. */
1705 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1706 notfound = 1; lr = -1;
1707 } else if (cvp && (cv=cvp[nomethod_amg])) {
1708 notfound = 1; lr = 1;
1711 if (off==-1) off=method;
1712 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1713 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1714 AMG_id2name(method + assignshift),
1715 (flags & AMGf_unary ? " " : "\n\tleft "),
1717 "in overloaded package ":
1718 "has no overloaded magic",
1720 HvNAME_get(SvSTASH(SvRV(left))):
1723 ",\n\tright argument in overloaded package ":
1726 : ",\n\tright argument has no overloaded magic"),
1728 HvNAME_get(SvSTASH(SvRV(right))):
1730 if (amtp && amtp->fallback >= AMGfallYES) {
1731 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1733 Perl_croak(aTHX_ "%"SVf, msg);
1737 force_cpy = force_cpy || assign;
1742 DEBUG_o(Perl_deb(aTHX_
1743 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1745 method+assignshift==off? "" :
1747 method+assignshift==off? "" :
1748 AMG_id2name(method+assignshift),
1749 method+assignshift==off? "" : "\")",
1750 flags & AMGf_unary? "" :
1751 lr==1 ? " for right argument": " for left argument",
1752 flags & AMGf_unary? " for argument" : "",
1753 stash ? HvNAME_get(stash) : "null",
1754 fl? ",\n\tassignment variant used": "") );
1757 /* Since we use shallow copy during assignment, we need
1758 * to dublicate the contents, probably calling user-supplied
1759 * version of copy operator
1761 /* We need to copy in following cases:
1762 * a) Assignment form was called.
1763 * assignshift==1, assign==T, method + 1 == off
1764 * b) Increment or decrement, called directly.
1765 * assignshift==0, assign==0, method + 0 == off
1766 * c) Increment or decrement, translated to assignment add/subtr.
1767 * assignshift==0, assign==T,
1769 * d) Increment or decrement, translated to nomethod.
1770 * assignshift==0, assign==0,
1772 * e) Assignment form translated to nomethod.
1773 * assignshift==1, assign==T, method + 1 != off
1776 /* off is method, method+assignshift, or a result of opcode substitution.
1777 * In the latter case assignshift==0, so only notfound case is important.
1779 if (( (method + assignshift == off)
1780 && (assign || (method == inc_amg) || (method == dec_amg)))
1787 const bool oldcatch = CATCH_GET;
1790 Zero(&myop, 1, BINOP);
1791 myop.op_last = (OP *) &myop;
1792 myop.op_next = Nullop;
1793 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1795 PUSHSTACKi(PERLSI_OVERLOAD);
1798 PL_op = (OP *) &myop;
1799 if (PERLDB_SUB && PL_curstash != PL_debstash)
1800 PL_op->op_private |= OPpENTERSUB_DB;
1804 EXTEND(SP, notfound + 5);
1805 PUSHs(lr>0? right: left);
1806 PUSHs(lr>0? left: right);
1807 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1809 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1814 if ((PL_op = Perl_pp_entersub(aTHX)))
1822 CATCH_SET(oldcatch);
1829 ans=SvIV(res)<=0; break;
1832 ans=SvIV(res)<0; break;
1835 ans=SvIV(res)>=0; break;
1838 ans=SvIV(res)>0; break;
1841 ans=SvIV(res)==0; break;
1844 ans=SvIV(res)!=0; break;
1847 SvSetSV(left,res); return left;
1849 ans=!SvTRUE(res); break;
1854 } else if (method==copy_amg) {
1856 Perl_croak(aTHX_ "Copy method did not return a reference");
1858 return SvREFCNT_inc(SvRV(res));
1866 =for apidoc is_gv_magical_sv
1868 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
1874 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
1877 const char * const temp = SvPV_const(name, len);
1878 return is_gv_magical(temp, len, flags);
1882 =for apidoc is_gv_magical
1884 Returns C<TRUE> if given the name of a magical GV.
1886 Currently only useful internally when determining if a GV should be
1887 created even in rvalue contexts.
1889 C<flags> is not used at present but available for future extension to
1890 allow selecting particular classes of magical variable.
1892 Currently assumes that C<name> is NUL terminated (as well as len being valid).
1893 This assumption is met by all callers within the perl core, which all pass
1894 pointers returned by SvPV.
1899 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
1901 PERL_UNUSED_ARG(flags);
1904 const char * const name1 = name + 1;
1907 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
1911 if (len == 8 && strEQ(name1, "VERLOAD"))
1915 if (len == 3 && name[1] == 'I' && name[2] == 'G')
1918 /* Using ${^...} variables is likely to be sufficiently rare that
1919 it seems sensible to avoid the space hit of also checking the
1921 case '\017': /* ${^OPEN} */
1922 if (strEQ(name1, "PEN"))
1925 case '\024': /* ${^TAINT} */
1926 if (strEQ(name1, "AINT"))
1929 case '\025': /* ${^UNICODE} */
1930 if (strEQ(name1, "NICODE"))
1932 if (strEQ(name1, "TF8LOCALE"))
1935 case '\027': /* ${^WARNING_BITS} */
1936 if (strEQ(name1, "ARNING_BITS"))
1949 const char *end = name + len;
1950 while (--end > name) {
1958 /* Because we're already assuming that name is NUL terminated
1959 below, we can treat an empty name as "\0" */
1986 case '\001': /* $^A */
1987 case '\003': /* $^C */
1988 case '\004': /* $^D */
1989 case '\005': /* $^E */
1990 case '\006': /* $^F */
1991 case '\010': /* $^H */
1992 case '\011': /* $^I, NOT \t in EBCDIC */
1993 case '\014': /* $^L */
1994 case '\016': /* $^N */
1995 case '\017': /* $^O */
1996 case '\020': /* $^P */
1997 case '\023': /* $^S */
1998 case '\024': /* $^T */
1999 case '\026': /* $^V */
2000 case '\027': /* $^W */
2021 * c-indentation-style: bsd
2023 * indent-tabs-mode: t
2026 * ex: set ts=8 sts=4 sw=4 noet: