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 $foo, @foo, %foo.
27 GVs are usually found as values in stashes (symbol table hashes) where
28 Perl stores its global variables.
38 Perl_gv_AVadd(pTHX_ register GV *gv)
40 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
41 Perl_croak(aTHX_ "Bad symbol for array");
48 Perl_gv_HVadd(pTHX_ register GV *gv)
50 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
51 Perl_croak(aTHX_ "Bad symbol for hash");
58 Perl_gv_IOadd(pTHX_ register GV *gv)
60 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
61 Perl_croak(aTHX_ "Bad symbol for filehandle");
63 #ifdef GV_UNIQUE_CHECK
65 Perl_croak(aTHX_ "Bad symbol for filehandle (GV is unique)");
74 Perl_gv_fetchfile(pTHX_ const char *name)
84 tmplen = strlen(name) + 2;
85 if (tmplen < sizeof smallbuf)
88 New(603, tmpbuf, tmplen + 1, char);
89 /* This is where the debugger's %{"::_<$filename"} hash is created */
92 strcpy(tmpbuf + 2, name);
93 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
95 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
96 sv_setpv(GvSV(gv), name);
98 hv_magic(GvHVn(gv_AVadd(gv)), Nullgv, PERL_MAGIC_dbfile);
100 if (tmpbuf != smallbuf)
106 Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
109 bool doproto = SvTYPE(gv) > SVt_NULL;
110 char *proto = (doproto && SvPOK(gv)) ? SvPVX(gv) : NULL;
112 sv_upgrade((SV*)gv, SVt_PVGV);
121 Newz(602, gp, 1, GP);
122 GvGP(gv) = gp_ref(gp);
123 GvSV(gv) = NEWSV(72,0);
124 GvLINE(gv) = CopLINE(PL_curcop);
125 GvFILE(gv) = CopFILE(PL_curcop) ? CopFILE(PL_curcop) : "";
128 sv_magic((SV*)gv, (SV*)gv, PERL_MAGIC_glob, Nullch, 0);
129 GvSTASH(gv) = (HV*)SvREFCNT_inc(stash);
130 GvNAME(gv) = savepvn(name, len);
132 if (multi || doproto) /* doproto means it _was_ mentioned */
134 if (doproto) { /* Replicate part of newSUB here. */
137 /* XXX unsafe for threads if eval_owner isn't held */
138 start_subparse(0,0); /* Create CV in compcv. */
139 GvCV(gv) = PL_compcv;
144 CvFILE_set_from_cop(GvCV(gv), PL_curcop);
145 CvSTASH(GvCV(gv)) = PL_curstash;
147 sv_setpv((SV*)GvCV(gv), proto);
154 S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
170 =for apidoc gv_fetchmeth
172 Returns the glob with the given C<name> and a defined subroutine or
173 C<NULL>. The glob lives in the given C<stash>, or in the stashes
174 accessible via @ISA and UNIVERSAL::.
176 The argument C<level> should be either 0 or -1. If C<level==0>, as a
177 side-effect creates a glob with the given C<name> in the given C<stash>
178 which in the case of success contains an alias for the subroutine, and sets
179 up caching info for this glob. Similarly for all the searched stashes.
181 This function grants C<"SUPER"> token as a postfix of the stash name. The
182 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
183 visible to Perl code. So when calling C<call_sv>, you should not use
184 the GV directly; instead, you should use the method's CV, which can be
185 obtained from the GV with the C<GvCV> macro.
191 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
199 /* UNIVERSAL methods should be callable without a stash */
201 level = -1; /* probably appropriate */
202 if(!(stash = gv_stashpvn("UNIVERSAL", 9, FALSE)))
208 "Can't use anonymous symbol table for method lookup");
210 if ((level > 100) || (level < -100))
211 Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
212 name, HvNAME(stash));
214 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,HvNAME(stash)) );
216 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
221 if (SvTYPE(topgv) != SVt_PVGV)
222 gv_init(topgv, stash, name, len, TRUE);
223 if ((cv = GvCV(topgv))) {
224 /* If genuine method or valid cache entry, use it */
225 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
227 /* Stale cached entry: junk it */
229 GvCV(topgv) = cv = Nullcv;
232 else if (GvCVGEN(topgv) == PL_sub_generation)
233 return 0; /* cache indicates sub doesn't exist */
236 gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE);
237 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : Nullav;
239 /* create and re-create @.*::SUPER::ISA on demand */
240 if (!av || !SvMAGIC(av)) {
241 char* packname = HvNAME(stash);
242 STRLEN packlen = strlen(packname);
244 if (packlen >= 7 && strEQ(packname + packlen - 7, "::SUPER")) {
248 basestash = gv_stashpvn(packname, packlen, TRUE);
249 gvp = (GV**)hv_fetch(basestash, "ISA", 3, FALSE);
250 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
251 gvp = (GV**)hv_fetch(stash, "ISA", 3, TRUE);
252 if (!gvp || !(gv = *gvp))
253 Perl_croak(aTHX_ "Cannot create %s::ISA", HvNAME(stash));
254 if (SvTYPE(gv) != SVt_PVGV)
255 gv_init(gv, stash, "ISA", 3, TRUE);
256 SvREFCNT_dec(GvAV(gv));
257 GvAV(gv) = (AV*)SvREFCNT_inc(av);
263 SV** svp = AvARRAY(av);
264 /* NOTE: No support for tied ISA */
265 I32 items = AvFILLp(av) + 1;
268 HV* basestash = gv_stashsv(sv, FALSE);
270 if (ckWARN(WARN_MISC))
271 Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
275 gv = gv_fetchmeth(basestash, name, len,
276 (level >= 0) ? level + 1 : level - 1);
282 /* if at top level, try UNIVERSAL */
284 if (level == 0 || level == -1) {
287 if ((lastchance = gv_stashpvn("UNIVERSAL", 9, FALSE))) {
288 if ((gv = gv_fetchmeth(lastchance, name, len,
289 (level >= 0) ? level + 1 : level - 1)))
293 * Cache method in topgv if:
294 * 1. topgv has no synonyms (else inheritance crosses wires)
295 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
298 GvREFCNT(topgv) == 1 &&
300 (CvROOT(cv) || CvXSUB(cv)))
302 if ((cv = GvCV(topgv)))
304 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
305 GvCVGEN(topgv) = PL_sub_generation;
309 else if (topgv && GvREFCNT(topgv) == 1) {
310 /* cache the fact that the method is not defined */
311 GvCVGEN(topgv) = PL_sub_generation;
320 =for apidoc gv_fetchmeth_autoload
322 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
323 Returns a glob for the subroutine.
325 For an autoloaded subroutine without a GV, will create a GV even
326 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
327 of the result may be zero.
333 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
335 GV *gv = gv_fetchmeth(stash, name, len, level);
338 char autoload[] = "AUTOLOAD";
339 STRLEN autolen = sizeof(autoload)-1;
344 return Nullgv; /* UNIVERSAL::AUTOLOAD could cause trouble */
345 if (len == autolen && strnEQ(name, autoload, autolen))
347 if (!(gv = gv_fetchmeth(stash, autoload, autolen, FALSE)))
350 if (!(CvROOT(cv) || CvXSUB(cv)))
352 /* Have an autoload */
353 if (level < 0) /* Cannot do without a stub */
354 gv_fetchmeth(stash, name, len, 0);
355 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
364 =for apidoc gv_fetchmethod
366 See L<gv_fetchmethod_autoload>.
372 Perl_gv_fetchmethod(pTHX_ HV *stash, const char *name)
374 return gv_fetchmethod_autoload(stash, name, TRUE);
378 =for apidoc gv_fetchmethod_autoload
380 Returns the glob which contains the subroutine to call to invoke the method
381 on the C<stash>. In fact in the presence of autoloading this may be the
382 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
385 The third parameter of C<gv_fetchmethod_autoload> determines whether
386 AUTOLOAD lookup is performed if the given method is not present: non-zero
387 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
388 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
389 with a non-zero C<autoload> parameter.
391 These functions grant C<"SUPER"> token as a prefix of the method name. Note
392 that if you want to keep the returned glob for a long time, you need to
393 check for it being "AUTOLOAD", since at the later time the call may load a
394 different subroutine due to $AUTOLOAD changing its value. Use the glob
395 created via a side effect to do this.
397 These functions have the same side-effects and as C<gv_fetchmeth> with
398 C<level==0>. C<name> should be writable if contains C<':'> or C<'
399 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
400 C<call_sv> apply equally to these functions.
406 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
408 register const char *nend;
409 const char *nsplit = 0;
413 if (stash && SvTYPE(stash) < SVt_PVHV)
416 for (nend = name; *nend; nend++) {
419 else if (*nend == ':' && *(nend + 1) == ':')
423 const char *origname = name;
427 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
428 /* ->SUPER::method should really be looked up in original stash */
429 SV *tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
430 CopSTASHPV(PL_curcop)));
431 /* __PACKAGE__::SUPER stash should be autovivified */
432 stash = gv_stashpvn(SvPVX(tmpstr), SvCUR(tmpstr), TRUE);
433 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
434 origname, HvNAME(stash), name) );
437 /* don't autovifify if ->NoSuchStash::method */
438 stash = gv_stashpvn(origname, nsplit - origname, FALSE);
440 /* however, explicit calls to Pkg::SUPER::method may
441 happen, and may require autovivification to work */
442 if (!stash && (nsplit - origname) >= 7 &&
443 strnEQ(nsplit - 7, "::SUPER", 7) &&
444 gv_stashpvn(origname, nsplit - origname - 7, FALSE))
445 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
450 gv = gv_fetchmeth(stash, name, nend - name, 0);
452 if (strEQ(name,"import") || strEQ(name,"unimport"))
453 gv = (GV*)&PL_sv_yes;
455 gv = gv_autoload4(ostash, name, nend - name, TRUE);
459 if (!CvROOT(cv) && !CvXSUB(cv)) {
467 if (GvCV(stubgv) != cv) /* orphaned import */
470 autogv = gv_autoload4(GvSTASH(stubgv),
471 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
481 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
483 char autoload[] = "AUTOLOAD";
484 STRLEN autolen = sizeof(autoload)-1;
492 if (len == autolen && strnEQ(name, autoload, autolen))
495 if (SvTYPE(stash) < SVt_PVHV) {
496 packname = SvPV_nolen((SV*)stash);
500 packname = HvNAME(stash);
503 if (!(gv = gv_fetchmeth(stash, autoload, autolen, FALSE)))
507 if (!(CvROOT(cv) || CvXSUB(cv)))
511 * Inheriting AUTOLOAD for non-methods works ... for now.
513 if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX) && !method &&
514 (GvCVGEN(gv) || GvSTASH(gv) != stash))
515 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
516 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
517 packname, (int)len, name);
520 /* rather than lookup/init $AUTOLOAD here
521 * only to have the XSUB do another lookup for $AUTOLOAD
522 * and split that value on the last '::',
523 * pass along the same data via some unused fields in the CV
526 SvPVX(cv) = (char *)name; /* cast to lose constness warning */
532 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
533 * The subroutine's original name may not be "AUTOLOAD", so we don't
534 * use that, but for lack of anything better we will use the sub's
535 * original package to look up $AUTOLOAD.
537 varstash = GvSTASH(CvGV(cv));
538 vargv = *(GV**)hv_fetch(varstash, autoload, autolen, TRUE);
542 gv_init(vargv, varstash, autoload, autolen, FALSE);
545 sv_setpv(varsv, packname);
546 sv_catpvn(varsv, "::", 2);
547 sv_catpvn(varsv, name, len);
548 SvTAINTED_off(varsv);
552 /* The "gv" parameter should be the glob known to Perl code as *!
553 * The scalar must already have been magicalized.
556 S_require_errno(pTHX_ GV *gv)
558 HV* stash = gv_stashpvn("Errno",5,FALSE);
560 if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
564 save_scalar(gv); /* keep the value of $! */
565 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
566 newSVpvn("Errno",5), Nullsv);
569 stash = gv_stashpvn("Errno",5,FALSE);
570 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
571 Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available");
576 =for apidoc gv_stashpv
578 Returns a pointer to the stash for a specified package. C<name> should
579 be a valid UTF-8 string and must be null-terminated. If C<create> is set
580 then the package will be created if it does not already exist. If C<create>
581 is not set and the package does not exist then NULL is returned.
587 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
589 return gv_stashpvn(name, strlen(name), create);
593 =for apidoc gv_stashpvn
595 Returns a pointer to the stash for a specified package. C<name> should
596 be a valid UTF-8 string. The C<namelen> parameter indicates the length of
597 the C<name>, in bytes. If C<create> is set then the package will be
598 created if it does not already exist. If C<create> is not set and the
599 package does not exist then NULL is returned.
605 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
612 if (namelen + 3 < sizeof smallbuf)
615 New(606, tmpbuf, namelen + 3, char);
616 Copy(name,tmpbuf,namelen,char);
617 tmpbuf[namelen++] = ':';
618 tmpbuf[namelen++] = ':';
619 tmpbuf[namelen] = '\0';
620 tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV);
621 if (tmpbuf != smallbuf)
626 GvHV(tmpgv) = newHV();
629 HvNAME(stash) = savepv(name);
634 =for apidoc gv_stashsv
636 Returns a pointer to the stash for a specified package, which must be a
637 valid UTF-8 string. See C<gv_stashpv>.
643 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
648 return gv_stashpvn(ptr, len, create);
653 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
654 STRLEN len = strlen (nambeg);
655 return gv_fetchpvn_flags(nambeg, len, add, sv_type);
659 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
661 const char *nambeg = SvPV(name, len);
662 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
666 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
669 register const char *name = nambeg;
673 register const char *namend;
675 I32 add = flags & ~SVf_UTF8;
677 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
680 for (namend = name; *namend; namend++) {
681 if ((*namend == ':' && namend[1] == ':')
682 || (*namend == '\'' && namend[1]))
686 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
694 if (len + 3 < sizeof (smallbuf))
697 New(601, tmpbuf, len+3, char);
698 Copy(name, tmpbuf, len, char);
702 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
703 gv = gvp ? *gvp : Nullgv;
704 if (gv && gv != (GV*)&PL_sv_undef) {
705 if (SvTYPE(gv) != SVt_PVGV)
706 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
710 if (tmpbuf != smallbuf)
712 if (!gv || gv == (GV*)&PL_sv_undef)
715 if (!(stash = GvHV(gv)))
716 stash = GvHV(gv) = newHV();
719 HvNAME(stash) = savepvn(nambeg, namend - nambeg);
727 return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE);
732 /* No stash in name, so see how we can default */
735 if (isIDFIRST_lazy(name)) {
738 /* name is always \0 terminated, and initial \0 wouldn't return
739 true from isIDFIRST_lazy, so we know that name[1] is defined */
746 if (strEQ(name, "INC") || strEQ(name, "ENV"))
750 if (strEQ(name, "SIG"))
754 if (strEQ(name, "STDIN") || strEQ(name, "STDOUT") ||
755 strEQ(name, "STDERR"))
759 if (strEQ(name, "ARGV") || strEQ(name, "ARGVOUT"))
766 else if (IN_PERL_COMPILETIME) {
768 if (add && (PL_hints & HINT_STRICT_VARS) &&
769 sv_type != SVt_PVCV &&
770 sv_type != SVt_PVGV &&
771 sv_type != SVt_PVFM &&
772 sv_type != SVt_PVIO &&
773 !(len == 1 && sv_type == SVt_PV &&
774 (*name == 'a' || *name == 'b')) )
776 gvp = (GV**)hv_fetch(stash,name,len,0);
778 *gvp == (GV*)&PL_sv_undef ||
779 SvTYPE(*gvp) != SVt_PVGV)
783 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
784 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
785 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
787 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
788 sv_type == SVt_PVAV ? '@' :
789 sv_type == SVt_PVHV ? '%' : '$',
792 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
798 stash = CopSTASH(PL_curcop);
804 /* By this point we should have a stash and a name */
808 register SV *err = Perl_mess(aTHX_
809 "Global symbol \"%s%s\" requires explicit package name",
810 (sv_type == SVt_PV ? "$"
811 : sv_type == SVt_PVAV ? "@"
812 : sv_type == SVt_PVHV ? "%"
814 if (USE_UTF8_IN_NAMES)
817 stash = GvHV(gv_fetchpv("<none>::", GV_ADDMULTI, SVt_PVHV));
823 if (!SvREFCNT(stash)) /* symbol table under destruction */
826 gvp = (GV**)hv_fetch(stash,name,len,add);
827 if (!gvp || *gvp == (GV*)&PL_sv_undef)
830 if (SvTYPE(gv) == SVt_PVGV) {
833 gv_init_sv(gv, sv_type);
834 if (*name=='!' && sv_type == SVt_PVHV && len==1)
838 } else if (add & GV_NOINIT) {
842 /* Adding a new symbol */
844 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
845 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
846 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
847 gv_init_sv(gv, sv_type);
849 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
850 : (PL_dowarn & G_WARN_ON ) ) )
853 /* set up magic where warranted */
857 /* Nothing else to do.
858 The compiler will probably turn the switch statement into a
859 branch table. Make sure we avoid even that small overhead for
860 the common case of lower case variable names. */
864 const char *name2 = name + 1;
867 if (strEQ(name2, "RGV")) {
868 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
872 if (strnEQ(name2, "XPORT", 5))
876 if (strEQ(name2, "SA")) {
879 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, Nullch, 0);
880 /* NOTE: No support for tied ISA */
881 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
882 && AvFILLp(av) == -1)
885 av_push(av, newSVpvn(pname = "NDBM_File",9));
886 gv_stashpvn(pname, 9, TRUE);
887 av_push(av, newSVpvn(pname = "DB_File",7));
888 gv_stashpvn(pname, 7, TRUE);
889 av_push(av, newSVpvn(pname = "GDBM_File",9));
890 gv_stashpvn(pname, 9, TRUE);
891 av_push(av, newSVpvn(pname = "SDBM_File",9));
892 gv_stashpvn(pname, 9, TRUE);
893 av_push(av, newSVpvn(pname = "ODBM_File",9));
894 gv_stashpvn(pname, 9, TRUE);
899 if (strEQ(name2, "VERLOAD")) {
902 hv_magic(hv, Nullgv, PERL_MAGIC_overload);
906 if (strEQ(name2, "IG")) {
910 Newz(73, PL_psig_ptr, SIG_SIZE, SV*);
911 Newz(73, PL_psig_name, SIG_SIZE, SV*);
912 Newz(73, PL_psig_pend, SIG_SIZE, int);
916 hv_magic(hv, Nullgv, PERL_MAGIC_sig);
917 for (i = 1; i < SIG_SIZE; i++) {
919 init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
921 sv_setsv(*init, &PL_sv_undef);
929 if (strEQ(name2, "ERSION"))
932 case '\005': /* $^ENCODING */
933 if (strEQ(name2, "NCODING"))
936 case '\017': /* $^OPEN */
937 if (strEQ(name2, "PEN"))
940 case '\024': /* ${^TAINT} */
941 if (strEQ(name2, "AINT"))
944 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
945 if (strEQ(name2, "NICODE"))
947 if (strEQ(name2, "TF8LOCALE"))
950 case '\027': /* $^WARNING_BITS */
951 if (strEQ(name2, "ARNING_BITS"))
964 /* ensures variable is only digits */
965 /* ${"1foo"} fails this test (and is thus writeable) */
966 /* added by japhy, but borrowed from is_gv_magical */
967 const char *end = name + len;
968 while (--end > name) {
969 if (!isDIGIT(*end)) return gv;
976 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
977 be case '\0' in this switch statement (ie a default case) */
983 sv_type == SVt_PVAV ||
984 sv_type == SVt_PVHV ||
985 sv_type == SVt_PVCV ||
986 sv_type == SVt_PVFM ||
989 PL_sawampersand = TRUE;
993 sv_setpv(GvSV(gv),PL_chopset);
997 #ifdef COMPLEX_STATUS
998 (void)SvUPGRADE(GvSV(gv), SVt_PVLV);
1004 /* If %! has been used, automatically load Errno.pm.
1005 The require will itself set errno, so in order to
1006 preserve its value we have to set up the magic
1007 now (rather than going to magicalize)
1010 sv_magic(GvSV(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1012 if (sv_type == SVt_PVHV)
1019 sv_magic((SV*)av, Nullsv, PERL_MAGIC_regdata, Nullch, 0);
1024 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1025 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1026 "$* is no longer supported");
1029 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1030 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1031 "Use of $# is deprecated");
1034 sv_setiv(GvSV(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1040 sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, Nullch, 0);
1044 case '\023': /* $^S */
1055 SvREADONLY_on(GvSV(gv));
1070 case '\001': /* $^A */
1071 case '\003': /* $^C */
1072 case '\004': /* $^D */
1073 case '\005': /* $^E */
1074 case '\006': /* $^F */
1075 case '\010': /* $^H */
1076 case '\011': /* $^I, NOT \t in EBCDIC */
1077 case '\016': /* $^N */
1078 case '\017': /* $^O */
1079 case '\020': /* $^P */
1080 case '\024': /* $^T */
1081 case '\027': /* $^W */
1083 sv_magic(GvSV(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1086 case '\014': /* $^L */
1087 sv_setpv(GvSV(gv),"\f");
1088 PL_formfeed = GvSV(gv);
1091 sv_setpv(GvSV(gv),"\034");
1096 if (!sv_derived_from(PL_patchlevel, "version"))
1097 (void *)upg_version(PL_patchlevel);
1098 GvSV(gv) = vnumify(PL_patchlevel);
1099 SvREADONLY_on(GvSV(gv));
1103 case '\026': /* $^V */
1106 GvSV(gv) = new_version(PL_patchlevel);
1107 SvREADONLY_on(GvSV(gv));
1117 Perl_gv_fullname4(pTHX_ SV *sv, GV *gv, const char *prefix, bool keepmain)
1120 HV *hv = GvSTASH(gv);
1125 sv_setpv(sv, prefix ? prefix : "");
1131 if (keepmain || strNE(name, "main")) {
1133 sv_catpvn(sv,"::", 2);
1135 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1139 Perl_gv_fullname3(pTHX_ SV *sv, GV *gv, const char *prefix)
1141 gv_fullname4(sv, gv, prefix, TRUE);
1145 Perl_gv_efullname4(pTHX_ SV *sv, GV *gv, const char *prefix, bool keepmain)
1147 GV *egv = GvEGV(gv);
1150 gv_fullname4(sv, egv, prefix, keepmain);
1154 Perl_gv_efullname3(pTHX_ SV *sv, GV *gv, const char *prefix)
1156 gv_efullname4(sv, gv, prefix, TRUE);
1159 /* XXX compatibility with versions <= 5.003. */
1161 Perl_gv_fullname(pTHX_ SV *sv, GV *gv)
1163 gv_fullname3(sv, gv, sv == (SV*)gv ? "*" : "");
1166 /* XXX compatibility with versions <= 5.003. */
1168 Perl_gv_efullname(pTHX_ SV *sv, GV *gv)
1170 gv_efullname3(sv, gv, sv == (SV*)gv ? "*" : "");
1179 io = (IO*)NEWSV(0,0);
1180 sv_upgrade((SV *)io,SVt_PVIO);
1183 /* Clear the stashcache because a new IO could overrule a
1185 hv_clear(PL_stashcache);
1186 iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV);
1187 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1188 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1189 iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV);
1190 SvSTASH(io) = (HV*)SvREFCNT_inc(GvHV(iogv));
1195 Perl_gv_check(pTHX_ HV *stash)
1202 if (!HvARRAY(stash))
1204 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1205 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1206 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1207 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1209 if (hv != PL_defstash && hv != stash)
1210 gv_check(hv); /* nested package */
1212 else if (isALPHA(*HeKEY(entry))) {
1214 gv = (GV*)HeVAL(entry);
1215 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1218 /* performance hack: if filename is absolute and it's a standard
1219 * module, don't bother warning */
1221 && PERL_FILE_IS_ABSOLUTE(file)
1222 #ifdef MACOS_TRADITIONAL
1223 && (instr(file, ":lib:")
1225 && (instr(file, "/lib/")
1227 || instr(file, ".pm")))
1231 CopLINE_set(PL_curcop, GvLINE(gv));
1233 CopFILE(PL_curcop) = file; /* set for warning */
1235 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1237 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1238 "Name \"%s::%s\" used only once: possible typo",
1239 HvNAME(stash), GvNAME(gv));
1246 Perl_newGVgen(pTHX_ char *pack)
1248 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1252 /* hopefully this is only called on local symbol table entries */
1255 Perl_gp_ref(pTHX_ GP *gp)
1262 /* multi-named GPs cannot be used for method cache */
1263 SvREFCNT_dec(gp->gp_cv);
1268 /* Adding a new name to a subroutine invalidates method cache */
1269 PL_sub_generation++;
1276 Perl_gp_free(pTHX_ GV *gv)
1280 if (!gv || !(gp = GvGP(gv)))
1282 if (gp->gp_refcnt == 0) {
1283 if (ckWARN_d(WARN_INTERNAL))
1284 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1285 "Attempt to free unreferenced glob pointers"
1286 pTHX__FORMAT pTHX__VALUE);
1290 /* Deleting the name of a subroutine invalidates method cache */
1291 PL_sub_generation++;
1293 if (--gp->gp_refcnt > 0) {
1294 if (gp->gp_egv == gv)
1299 if (gp->gp_sv) SvREFCNT_dec(gp->gp_sv);
1300 if (gp->gp_av) SvREFCNT_dec(gp->gp_av);
1302 if (PL_stashcache && HvNAME(gp->gp_hv))
1303 hv_delete(PL_stashcache,
1304 HvNAME(gp->gp_hv), strlen(HvNAME(gp->gp_hv)),
1306 SvREFCNT_dec(gp->gp_hv);
1308 if (gp->gp_io) SvREFCNT_dec(gp->gp_io);
1309 if (gp->gp_cv) SvREFCNT_dec(gp->gp_cv);
1310 if (gp->gp_form) SvREFCNT_dec(gp->gp_form);
1317 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1319 AMT *amtp = (AMT*)mg->mg_ptr;
1320 if (amtp && AMT_AMAGIC(amtp)) {
1322 for (i = 1; i < NofAMmeth; i++) {
1323 CV *cv = amtp->table[i];
1325 SvREFCNT_dec((SV *) cv);
1326 amtp->table[i] = Nullcv;
1333 /* Updates and caches the CV's */
1336 Perl_Gv_AMupdate(pTHX_ HV *stash)
1340 MAGIC* mg=mg_find((SV*)stash, PERL_MAGIC_overload_table);
1341 AMT *amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
1344 if (mg && amtp->was_ok_am == PL_amagic_generation
1345 && amtp->was_ok_sub == PL_sub_generation)
1346 return (bool)AMT_OVERLOADED(amtp);
1347 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1349 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME(stash)) );
1352 amt.was_ok_am = PL_amagic_generation;
1353 amt.was_ok_sub = PL_sub_generation;
1354 amt.fallback = AMGfallNO;
1358 int filled = 0, have_ovl = 0;
1362 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1364 /* Try to find via inheritance. */
1365 gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1370 lim = DESTROY_amg; /* Skip overloading entries. */
1371 else if (SvTRUE(sv))
1372 amt.fallback=AMGfallYES;
1374 amt.fallback=AMGfallNEVER;
1376 for (i = 1; i < lim; i++)
1377 amt.table[i] = Nullcv;
1378 for (; i < NofAMmeth; i++) {
1379 char *cooky = (char*)PL_AMG_names[i];
1380 /* Human-readable form, for debugging: */
1381 char *cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1382 STRLEN l = strlen(cooky);
1384 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of `%s' in package `%.256s'\n",
1385 cp, HvNAME(stash)) );
1386 /* don't fill the cache while looking up!
1387 Creation of inheritance stubs in intermediate packages may
1388 conflict with the logic of runtime method substitution.
1389 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1390 then we could have created stubs for "(+0" in A and C too.
1391 But if B overloads "bool", we may want to use it for
1392 numifying instead of C's "+0". */
1393 if (i >= DESTROY_amg)
1394 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1395 else /* Autoload taken care of below */
1396 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1398 if (gv && (cv = GvCV(gv))) {
1399 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1400 && strEQ(HvNAME(GvSTASH(CvGV(cv))), "overload")) {
1401 /* This is a hack to support autoloading..., while
1402 knowing *which* methods were declared as overloaded. */
1403 /* GvSV contains the name of the method. */
1406 DEBUG_o( Perl_deb(aTHX_ "Resolving method `%"SVf256\
1407 "' for overloaded `%s' in package `%.256s'\n",
1408 GvSV(gv), cp, HvNAME(stash)) );
1409 if (!SvPOK(GvSV(gv))
1410 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX(GvSV(gv)),
1413 /* Can be an import stub (created by `can'). */
1414 SV *gvsv = GvSV(gv);
1415 const char *name = SvPOK(gvsv) ? SvPVX(gvsv) : "???";
1416 Perl_croak(aTHX_ "%s method `%.256s' overloading `%s' "\
1417 "in package `%.256s'",
1418 (GvCVGEN(gv) ? "Stub found while resolving"
1420 name, cp, HvNAME(stash));
1422 cv = GvCV(gv = ngv);
1424 DEBUG_o( Perl_deb(aTHX_ "Overloading `%s' in package `%.256s' via `%.256s::%.256s' \n",
1425 cp, HvNAME(stash), HvNAME(GvSTASH(CvGV(cv))),
1426 GvNAME(CvGV(cv))) );
1428 if (i < DESTROY_amg)
1430 } else if (gv) { /* Autoloaded... */
1434 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1437 AMT_AMAGIC_on(&amt);
1439 AMT_OVERLOADED_on(&amt);
1440 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1441 (char*)&amt, sizeof(AMT));
1445 /* Here we have no table: */
1447 AMT_AMAGIC_off(&amt);
1448 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1449 (char*)&amt, sizeof(AMTS));
1455 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1461 if (!stash || !HvNAME(stash))
1463 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1467 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1469 amtp = (AMT*)mg->mg_ptr;
1470 if ( amtp->was_ok_am != PL_amagic_generation
1471 || amtp->was_ok_sub != PL_sub_generation )
1473 if (AMT_AMAGIC(amtp)) {
1474 ret = amtp->table[id];
1475 if (ret && isGV(ret)) { /* Autoloading stab */
1476 /* Passing it through may have resulted in a warning
1477 "Inherited AUTOLOAD for a non-method deprecated", since
1478 our caller is going through a function call, not a method call.
1479 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1480 GV *gv = gv_fetchmethod(stash, (char*)PL_AMG_names[id]);
1493 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1497 CV **cvp=NULL, **ocvp=NULL;
1498 AMT *amtp=NULL, *oamtp=NULL;
1499 int off=0, off1, lr=0, assign=AMGf_assign & flags, notfound=0;
1500 int postpr = 0, force_cpy = 0, assignshift = assign ? 1 : 0;
1505 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1506 && (stash = SvSTASH(SvRV(left)))
1507 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1508 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1509 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1511 && ((cv = cvp[off=method+assignshift])
1512 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1518 cv = cvp[off=method])))) {
1519 lr = -1; /* Call method for left argument */
1521 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1524 /* look for substituted methods */
1525 /* In all the covered cases we should be called with assign==0. */
1529 if ((cv = cvp[off=add_ass_amg])
1530 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1531 right = &PL_sv_yes; lr = -1; assign = 1;
1536 if ((cv = cvp[off = subtr_ass_amg])
1537 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1538 right = &PL_sv_yes; lr = -1; assign = 1;
1542 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1545 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1548 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1551 (void)((cv = cvp[off=bool__amg])
1552 || (cv = cvp[off=numer_amg])
1553 || (cv = cvp[off=string_amg]));
1559 * SV* ref causes confusion with the interpreter variable of
1562 SV* tmpRef=SvRV(left);
1563 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1565 * Just to be extra cautious. Maybe in some
1566 * additional cases sv_setsv is safe, too.
1568 SV* newref = newSVsv(tmpRef);
1569 SvOBJECT_on(newref);
1570 SvSTASH(newref) = (HV*)SvREFCNT_inc(SvSTASH(tmpRef));
1576 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1577 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1578 SV* nullsv=sv_2mortal(newSViv(0));
1580 SV* lessp = amagic_call(left,nullsv,
1581 lt_amg,AMGf_noright);
1582 logic = SvTRUE(lessp);
1584 SV* lessp = amagic_call(left,nullsv,
1585 ncmp_amg,AMGf_noright);
1586 logic = (SvNV(lessp) < 0);
1589 if (off==subtr_amg) {
1600 if ((cv = cvp[off=subtr_amg])) {
1602 left = sv_2mortal(newSViv(0));
1607 case iter_amg: /* XXXX Eventually should do to_gv. */
1609 return NULL; /* Delegate operation to standard mechanisms. */
1617 return left; /* Delegate operation to standard mechanisms. */
1622 if (!cv) goto not_found;
1623 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1624 && (stash = SvSTASH(SvRV(right)))
1625 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1626 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1627 ? (amtp = (AMT*)mg->mg_ptr)->table
1629 && (cv = cvp[off=method])) { /* Method for right
1632 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1633 && (cvp=ocvp) && (lr = -1))
1634 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1635 && !(flags & AMGf_unary)) {
1636 /* We look for substitution for
1637 * comparison operations and
1639 if (method==concat_amg || method==concat_ass_amg
1640 || method==repeat_amg || method==repeat_ass_amg) {
1641 return NULL; /* Delegate operation to string conversion */
1651 postpr = 1; off=ncmp_amg; break;
1658 postpr = 1; off=scmp_amg; break;
1660 if (off != -1) cv = cvp[off];
1665 not_found: /* No method found, either report or croak */
1673 return left; /* Delegate operation to standard mechanisms. */
1676 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1677 notfound = 1; lr = -1;
1678 } else if (cvp && (cv=cvp[nomethod_amg])) {
1679 notfound = 1; lr = 1;
1682 if (off==-1) off=method;
1683 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1684 "Operation `%s': no method found,%sargument %s%s%s%s",
1685 AMG_id2name(method + assignshift),
1686 (flags & AMGf_unary ? " " : "\n\tleft "),
1688 "in overloaded package ":
1689 "has no overloaded magic",
1691 HvNAME(SvSTASH(SvRV(left))):
1694 ",\n\tright argument in overloaded package ":
1697 : ",\n\tright argument has no overloaded magic"),
1699 HvNAME(SvSTASH(SvRV(right))):
1701 if (amtp && amtp->fallback >= AMGfallYES) {
1702 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX(msg)) );
1704 Perl_croak(aTHX_ "%"SVf, msg);
1708 force_cpy = force_cpy || assign;
1713 DEBUG_o(Perl_deb(aTHX_
1714 "Overloaded operator `%s'%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1716 method+assignshift==off? "" :
1718 method+assignshift==off? "" :
1719 AMG_id2name(method+assignshift),
1720 method+assignshift==off? "" : "')",
1721 flags & AMGf_unary? "" :
1722 lr==1 ? " for right argument": " for left argument",
1723 flags & AMGf_unary? " for argument" : "",
1724 stash ? HvNAME(stash) : "null",
1725 fl? ",\n\tassignment variant used": "") );
1728 /* Since we use shallow copy during assignment, we need
1729 * to dublicate the contents, probably calling user-supplied
1730 * version of copy operator
1732 /* We need to copy in following cases:
1733 * a) Assignment form was called.
1734 * assignshift==1, assign==T, method + 1 == off
1735 * b) Increment or decrement, called directly.
1736 * assignshift==0, assign==0, method + 0 == off
1737 * c) Increment or decrement, translated to assignment add/subtr.
1738 * assignshift==0, assign==T,
1740 * d) Increment or decrement, translated to nomethod.
1741 * assignshift==0, assign==0,
1743 * e) Assignment form translated to nomethod.
1744 * assignshift==1, assign==T, method + 1 != off
1747 /* off is method, method+assignshift, or a result of opcode substitution.
1748 * In the latter case assignshift==0, so only notfound case is important.
1750 if (( (method + assignshift == off)
1751 && (assign || (method == inc_amg) || (method == dec_amg)))
1758 bool oldcatch = CATCH_GET;
1761 Zero(&myop, 1, BINOP);
1762 myop.op_last = (OP *) &myop;
1763 myop.op_next = Nullop;
1764 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1766 PUSHSTACKi(PERLSI_OVERLOAD);
1769 PL_op = (OP *) &myop;
1770 if (PERLDB_SUB && PL_curstash != PL_debstash)
1771 PL_op->op_private |= OPpENTERSUB_DB;
1775 EXTEND(SP, notfound + 5);
1776 PUSHs(lr>0? right: left);
1777 PUSHs(lr>0? left: right);
1778 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1780 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1785 if ((PL_op = Perl_pp_entersub(aTHX)))
1793 CATCH_SET(oldcatch);
1800 ans=SvIV(res)<=0; break;
1803 ans=SvIV(res)<0; break;
1806 ans=SvIV(res)>=0; break;
1809 ans=SvIV(res)>0; break;
1812 ans=SvIV(res)==0; break;
1815 ans=SvIV(res)!=0; break;
1818 SvSetSV(left,res); return left;
1820 ans=!SvTRUE(res); break;
1823 } else if (method==copy_amg) {
1825 Perl_croak(aTHX_ "Copy method did not return a reference");
1827 return SvREFCNT_inc(SvRV(res));
1835 =for apidoc is_gv_magical
1837 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
1843 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
1846 char *temp = SvPV(name, len);
1847 return is_gv_magical(temp, len, flags);
1851 =for apidoc is_gv_magical
1853 Returns C<TRUE> if given the name of a magical GV.
1855 Currently only useful internally when determining if a GV should be
1856 created even in rvalue contexts.
1858 C<flags> is not used at present but available for future extension to
1859 allow selecting particular classes of magical variable.
1861 Currently assumes that C<name> is NUL terminated (as well as len being valid).
1862 This assumption is met by all callers within the perl core, which all pass
1863 pointers returned by SvPV.
1868 Perl_is_gv_magical(pTHX_ char *name, STRLEN len, U32 flags)
1871 const char *name1 = name + 1;
1874 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
1878 if (len == 8 && strEQ(name1, "VERLOAD"))
1882 if (len == 3 && name[1] == 'I' && name[2] == 'G')
1885 /* Using ${^...} variables is likely to be sufficiently rare that
1886 it seems sensible to avoid the space hit of also checking the
1888 case '\017': /* ${^OPEN} */
1889 if (strEQ(name1, "PEN"))
1892 case '\024': /* ${^TAINT} */
1893 if (strEQ(name1, "AINT"))
1896 case '\025': /* ${^UNICODE} */
1897 if (strEQ(name1, "NICODE"))
1899 if (strEQ(name1, "TF8LOCALE"))
1902 case '\027': /* ${^WARNING_BITS} */
1903 if (strEQ(name1, "ARNING_BITS"))
1916 char *end = name + len;
1917 while (--end > name) {
1925 /* Because we're already assuming that name is NUL terminated
1926 below, we can treat an empty name as "\0" */
1953 case '\001': /* $^A */
1954 case '\003': /* $^C */
1955 case '\004': /* $^D */
1956 case '\005': /* $^E */
1957 case '\006': /* $^F */
1958 case '\010': /* $^H */
1959 case '\011': /* $^I, NOT \t in EBCDIC */
1960 case '\014': /* $^L */
1961 case '\016': /* $^N */
1962 case '\017': /* $^O */
1963 case '\020': /* $^P */
1964 case '\023': /* $^S */
1965 case '\024': /* $^T */
1966 case '\026': /* $^V */
1967 case '\027': /* $^W */