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 const 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 /* XXX Ideally this cast would be replaced with a change to const char*
127 GvFILE(gv) = CopFILE(PL_curcop) ? CopFILE(PL_curcop) : (char *) "";
130 sv_magic((SV*)gv, (SV*)gv, PERL_MAGIC_glob, Nullch, 0);
131 GvSTASH(gv) = (HV*)SvREFCNT_inc(stash);
132 GvNAME(gv) = savepvn(name, len);
134 if (multi || doproto) /* doproto means it _was_ mentioned */
136 if (doproto) { /* Replicate part of newSUB here. */
139 /* XXX unsafe for threads if eval_owner isn't held */
140 start_subparse(0,0); /* Create CV in compcv. */
141 GvCV(gv) = PL_compcv;
146 CvFILE_set_from_cop(GvCV(gv), PL_curcop);
147 CvSTASH(GvCV(gv)) = PL_curstash;
149 sv_setpv((SV*)GvCV(gv), proto);
156 S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
172 =for apidoc gv_fetchmeth
174 Returns the glob with the given C<name> and a defined subroutine or
175 C<NULL>. The glob lives in the given C<stash>, or in the stashes
176 accessible via @ISA and UNIVERSAL::.
178 The argument C<level> should be either 0 or -1. If C<level==0>, as a
179 side-effect creates a glob with the given C<name> in the given C<stash>
180 which in the case of success contains an alias for the subroutine, and sets
181 up caching info for this glob. Similarly for all the searched stashes.
183 This function grants C<"SUPER"> token as a postfix of the stash name. The
184 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
185 visible to Perl code. So when calling C<call_sv>, you should not use
186 the GV directly; instead, you should use the method's CV, which can be
187 obtained from the GV with the C<GvCV> macro.
193 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
201 /* UNIVERSAL methods should be callable without a stash */
203 level = -1; /* probably appropriate */
204 if(!(stash = gv_stashpvn("UNIVERSAL", 9, FALSE)))
210 "Can't use anonymous symbol table for method lookup");
212 if ((level > 100) || (level < -100))
213 Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
214 name, HvNAME(stash));
216 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,HvNAME(stash)) );
218 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
223 if (SvTYPE(topgv) != SVt_PVGV)
224 gv_init(topgv, stash, name, len, TRUE);
225 if ((cv = GvCV(topgv))) {
226 /* If genuine method or valid cache entry, use it */
227 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
229 /* Stale cached entry: junk it */
231 GvCV(topgv) = cv = Nullcv;
234 else if (GvCVGEN(topgv) == PL_sub_generation)
235 return 0; /* cache indicates sub doesn't exist */
238 gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE);
239 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : Nullav;
241 /* create and re-create @.*::SUPER::ISA on demand */
242 if (!av || !SvMAGIC(av)) {
243 char* packname = HvNAME(stash);
244 STRLEN packlen = strlen(packname);
246 if (packlen >= 7 && strEQ(packname + packlen - 7, "::SUPER")) {
250 basestash = gv_stashpvn(packname, packlen, TRUE);
251 gvp = (GV**)hv_fetch(basestash, "ISA", 3, FALSE);
252 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
253 gvp = (GV**)hv_fetch(stash, "ISA", 3, TRUE);
254 if (!gvp || !(gv = *gvp))
255 Perl_croak(aTHX_ "Cannot create %s::ISA", HvNAME(stash));
256 if (SvTYPE(gv) != SVt_PVGV)
257 gv_init(gv, stash, "ISA", 3, TRUE);
258 SvREFCNT_dec(GvAV(gv));
259 GvAV(gv) = (AV*)SvREFCNT_inc(av);
265 SV** svp = AvARRAY(av);
266 /* NOTE: No support for tied ISA */
267 I32 items = AvFILLp(av) + 1;
270 HV* basestash = gv_stashsv(sv, FALSE);
272 if (ckWARN(WARN_MISC))
273 Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
277 gv = gv_fetchmeth(basestash, name, len,
278 (level >= 0) ? level + 1 : level - 1);
284 /* if at top level, try UNIVERSAL */
286 if (level == 0 || level == -1) {
289 if ((lastchance = gv_stashpvn("UNIVERSAL", 9, FALSE))) {
290 if ((gv = gv_fetchmeth(lastchance, name, len,
291 (level >= 0) ? level + 1 : level - 1)))
295 * Cache method in topgv if:
296 * 1. topgv has no synonyms (else inheritance crosses wires)
297 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
300 GvREFCNT(topgv) == 1 &&
302 (CvROOT(cv) || CvXSUB(cv)))
304 if ((cv = GvCV(topgv)))
306 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
307 GvCVGEN(topgv) = PL_sub_generation;
311 else if (topgv && GvREFCNT(topgv) == 1) {
312 /* cache the fact that the method is not defined */
313 GvCVGEN(topgv) = PL_sub_generation;
322 =for apidoc gv_fetchmeth_autoload
324 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
325 Returns a glob for the subroutine.
327 For an autoloaded subroutine without a GV, will create a GV even
328 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
329 of the result may be zero.
335 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
337 GV *gv = gv_fetchmeth(stash, name, len, level);
340 char autoload[] = "AUTOLOAD";
341 STRLEN autolen = sizeof(autoload)-1;
346 return Nullgv; /* UNIVERSAL::AUTOLOAD could cause trouble */
347 if (len == autolen && strnEQ(name, autoload, autolen))
349 if (!(gv = gv_fetchmeth(stash, autoload, autolen, FALSE)))
352 if (!(CvROOT(cv) || CvXSUB(cv)))
354 /* Have an autoload */
355 if (level < 0) /* Cannot do without a stub */
356 gv_fetchmeth(stash, name, len, 0);
357 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
366 =for apidoc gv_fetchmethod
368 See L<gv_fetchmethod_autoload>.
374 Perl_gv_fetchmethod(pTHX_ HV *stash, const char *name)
376 return gv_fetchmethod_autoload(stash, name, TRUE);
380 =for apidoc gv_fetchmethod_autoload
382 Returns the glob which contains the subroutine to call to invoke the method
383 on the C<stash>. In fact in the presence of autoloading this may be the
384 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
387 The third parameter of C<gv_fetchmethod_autoload> determines whether
388 AUTOLOAD lookup is performed if the given method is not present: non-zero
389 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
390 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
391 with a non-zero C<autoload> parameter.
393 These functions grant C<"SUPER"> token as a prefix of the method name. Note
394 that if you want to keep the returned glob for a long time, you need to
395 check for it being "AUTOLOAD", since at the later time the call may load a
396 different subroutine due to $AUTOLOAD changing its value. Use the glob
397 created via a side effect to do this.
399 These functions have the same side-effects and as C<gv_fetchmeth> with
400 C<level==0>. C<name> should be writable if contains C<':'> or C<'
401 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
402 C<call_sv> apply equally to these functions.
408 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
410 register const char *nend;
411 const char *nsplit = 0;
415 if (stash && SvTYPE(stash) < SVt_PVHV)
418 for (nend = name; *nend; nend++) {
421 else if (*nend == ':' && *(nend + 1) == ':')
425 const char *origname = name;
429 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
430 /* ->SUPER::method should really be looked up in original stash */
431 SV *tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
432 CopSTASHPV(PL_curcop)));
433 /* __PACKAGE__::SUPER stash should be autovivified */
434 stash = gv_stashpvn(SvPVX(tmpstr), SvCUR(tmpstr), TRUE);
435 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
436 origname, HvNAME(stash), name) );
439 /* don't autovifify if ->NoSuchStash::method */
440 stash = gv_stashpvn(origname, nsplit - origname, FALSE);
442 /* however, explicit calls to Pkg::SUPER::method may
443 happen, and may require autovivification to work */
444 if (!stash && (nsplit - origname) >= 7 &&
445 strnEQ(nsplit - 7, "::SUPER", 7) &&
446 gv_stashpvn(origname, nsplit - origname - 7, FALSE))
447 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
452 gv = gv_fetchmeth(stash, name, nend - name, 0);
454 if (strEQ(name,"import") || strEQ(name,"unimport"))
455 gv = (GV*)&PL_sv_yes;
457 gv = gv_autoload4(ostash, name, nend - name, TRUE);
461 if (!CvROOT(cv) && !CvXSUB(cv)) {
469 if (GvCV(stubgv) != cv) /* orphaned import */
472 autogv = gv_autoload4(GvSTASH(stubgv),
473 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
483 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
485 char autoload[] = "AUTOLOAD";
486 STRLEN autolen = sizeof(autoload)-1;
492 const char *packname = "";
494 if (len == autolen && strnEQ(name, autoload, autolen))
497 if (SvTYPE(stash) < SVt_PVHV) {
498 packname = SvPV_nolen((SV*)stash);
502 packname = HvNAME(stash);
505 if (!(gv = gv_fetchmeth(stash, autoload, autolen, FALSE)))
509 if (!(CvROOT(cv) || CvXSUB(cv)))
513 * Inheriting AUTOLOAD for non-methods works ... for now.
515 if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX) && !method &&
516 (GvCVGEN(gv) || GvSTASH(gv) != stash))
517 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
518 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
519 packname, (int)len, name);
522 /* rather than lookup/init $AUTOLOAD here
523 * only to have the XSUB do another lookup for $AUTOLOAD
524 * and split that value on the last '::',
525 * pass along the same data via some unused fields in the CV
528 SvPVX(cv) = (char *)name; /* cast to lose constness warning */
534 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
535 * The subroutine's original name may not be "AUTOLOAD", so we don't
536 * use that, but for lack of anything better we will use the sub's
537 * original package to look up $AUTOLOAD.
539 varstash = GvSTASH(CvGV(cv));
540 vargv = *(GV**)hv_fetch(varstash, autoload, autolen, TRUE);
544 gv_init(vargv, varstash, autoload, autolen, FALSE);
547 sv_setpv(varsv, packname);
548 sv_catpvn(varsv, "::", 2);
549 sv_catpvn(varsv, name, len);
550 SvTAINTED_off(varsv);
554 /* The "gv" parameter should be the glob known to Perl code as *!
555 * The scalar must already have been magicalized.
558 S_require_errno(pTHX_ GV *gv)
560 HV* stash = gv_stashpvn("Errno",5,FALSE);
562 if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
566 save_scalar(gv); /* keep the value of $! */
567 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
568 newSVpvn("Errno",5), Nullsv);
571 stash = gv_stashpvn("Errno",5,FALSE);
572 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
573 Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available");
578 =for apidoc gv_stashpv
580 Returns a pointer to the stash for a specified package. C<name> should
581 be a valid UTF-8 string and must be null-terminated. If C<create> is set
582 then the package will be created if it does not already exist. If C<create>
583 is not set and the package does not exist then NULL is returned.
589 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
591 return gv_stashpvn(name, strlen(name), create);
595 =for apidoc gv_stashpvn
597 Returns a pointer to the stash for a specified package. C<name> should
598 be a valid UTF-8 string. The C<namelen> parameter indicates the length of
599 the C<name>, in bytes. If C<create> is set then the package will be
600 created if it does not already exist. If C<create> is not set and the
601 package does not exist then NULL is returned.
607 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
614 if (namelen + 3 < sizeof smallbuf)
617 New(606, tmpbuf, namelen + 3, char);
618 Copy(name,tmpbuf,namelen,char);
619 tmpbuf[namelen++] = ':';
620 tmpbuf[namelen++] = ':';
621 tmpbuf[namelen] = '\0';
622 tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV);
623 if (tmpbuf != smallbuf)
628 GvHV(tmpgv) = newHV();
631 HvNAME(stash) = savepv(name);
636 =for apidoc gv_stashsv
638 Returns a pointer to the stash for a specified package, which must be a
639 valid UTF-8 string. See C<gv_stashpv>.
645 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
650 return gv_stashpvn(ptr, len, create);
655 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
656 STRLEN len = strlen (nambeg);
657 return gv_fetchpvn_flags(nambeg, len, add, sv_type);
661 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
663 const char *nambeg = SvPV(name, len);
664 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
668 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
671 register const char *name = nambeg;
675 register const char *namend;
677 const I32 add = flags & ~SVf_UTF8;
680 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
683 for (namend = name; *namend; namend++) {
684 if ((*namend == ':' && namend[1] == ':')
685 || (*namend == '\'' && namend[1]))
689 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
697 if (len + 3 < sizeof (smallbuf))
700 New(601, tmpbuf, len+3, char);
701 Copy(name, tmpbuf, len, char);
705 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
706 gv = gvp ? *gvp : Nullgv;
707 if (gv && gv != (GV*)&PL_sv_undef) {
708 if (SvTYPE(gv) != SVt_PVGV)
709 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
713 if (tmpbuf != smallbuf)
715 if (!gv || gv == (GV*)&PL_sv_undef)
718 if (!(stash = GvHV(gv)))
719 stash = GvHV(gv) = newHV();
722 HvNAME(stash) = savepvn(nambeg, namend - nambeg);
730 return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE);
735 /* No stash in name, so see how we can default */
738 if (isIDFIRST_lazy(name)) {
741 /* name is always \0 terminated, and initial \0 wouldn't return
742 true from isIDFIRST_lazy, so we know that name[1] is defined */
749 if (strEQ(name, "INC") || strEQ(name, "ENV"))
753 if (strEQ(name, "SIG"))
757 if (strEQ(name, "STDIN") || strEQ(name, "STDOUT") ||
758 strEQ(name, "STDERR"))
762 if (strEQ(name, "ARGV") || strEQ(name, "ARGVOUT"))
769 else if (IN_PERL_COMPILETIME) {
771 if (add && (PL_hints & HINT_STRICT_VARS) &&
772 sv_type != SVt_PVCV &&
773 sv_type != SVt_PVGV &&
774 sv_type != SVt_PVFM &&
775 sv_type != SVt_PVIO &&
776 !(len == 1 && sv_type == SVt_PV &&
777 (*name == 'a' || *name == 'b')) )
779 gvp = (GV**)hv_fetch(stash,name,len,0);
781 *gvp == (GV*)&PL_sv_undef ||
782 SvTYPE(*gvp) != SVt_PVGV)
786 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
787 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
788 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
790 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
791 sv_type == SVt_PVAV ? '@' :
792 sv_type == SVt_PVHV ? '%' : '$',
795 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
801 stash = CopSTASH(PL_curcop);
807 /* By this point we should have a stash and a name */
811 register SV *err = Perl_mess(aTHX_
812 "Global symbol \"%s%s\" requires explicit package name",
813 (sv_type == SVt_PV ? "$"
814 : sv_type == SVt_PVAV ? "@"
815 : sv_type == SVt_PVHV ? "%"
817 if (USE_UTF8_IN_NAMES)
820 stash = GvHV(gv_fetchpv("<none>::", GV_ADDMULTI, SVt_PVHV));
826 if (!SvREFCNT(stash)) /* symbol table under destruction */
829 gvp = (GV**)hv_fetch(stash,name,len,add);
830 if (!gvp || *gvp == (GV*)&PL_sv_undef)
833 if (SvTYPE(gv) == SVt_PVGV) {
836 gv_init_sv(gv, sv_type);
837 if (*name=='!' && sv_type == SVt_PVHV && len==1)
841 } else if (add & GV_NOINIT) {
845 /* Adding a new symbol */
847 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
848 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
849 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
850 gv_init_sv(gv, sv_type);
852 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
853 : (PL_dowarn & G_WARN_ON ) ) )
856 /* set up magic where warranted */
860 /* Nothing else to do.
861 The compiler will probably turn the switch statement into a
862 branch table. Make sure we avoid even that small overhead for
863 the common case of lower case variable names. */
867 const char *name2 = name + 1;
870 if (strEQ(name2, "RGV")) {
871 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
875 if (strnEQ(name2, "XPORT", 5))
879 if (strEQ(name2, "SA")) {
882 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, Nullch, 0);
883 /* NOTE: No support for tied ISA */
884 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
885 && AvFILLp(av) == -1)
888 av_push(av, newSVpvn(pname = "NDBM_File",9));
889 gv_stashpvn(pname, 9, TRUE);
890 av_push(av, newSVpvn(pname = "DB_File",7));
891 gv_stashpvn(pname, 7, TRUE);
892 av_push(av, newSVpvn(pname = "GDBM_File",9));
893 gv_stashpvn(pname, 9, TRUE);
894 av_push(av, newSVpvn(pname = "SDBM_File",9));
895 gv_stashpvn(pname, 9, TRUE);
896 av_push(av, newSVpvn(pname = "ODBM_File",9));
897 gv_stashpvn(pname, 9, TRUE);
902 if (strEQ(name2, "VERLOAD")) {
905 hv_magic(hv, Nullgv, PERL_MAGIC_overload);
909 if (strEQ(name2, "IG")) {
913 Newz(73, PL_psig_ptr, SIG_SIZE, SV*);
914 Newz(73, PL_psig_name, SIG_SIZE, SV*);
915 Newz(73, PL_psig_pend, SIG_SIZE, int);
919 hv_magic(hv, Nullgv, PERL_MAGIC_sig);
920 for (i = 1; i < SIG_SIZE; i++) {
922 init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
924 sv_setsv(*init, &PL_sv_undef);
932 if (strEQ(name2, "ERSION"))
935 case '\005': /* $^ENCODING */
936 if (strEQ(name2, "NCODING"))
939 case '\017': /* $^OPEN */
940 if (strEQ(name2, "PEN"))
943 case '\024': /* ${^TAINT} */
944 if (strEQ(name2, "AINT"))
947 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
948 if (strEQ(name2, "NICODE"))
950 if (strEQ(name2, "TF8LOCALE"))
953 case '\027': /* $^WARNING_BITS */
954 if (strEQ(name2, "ARNING_BITS"))
967 /* ensures variable is only digits */
968 /* ${"1foo"} fails this test (and is thus writeable) */
969 /* added by japhy, but borrowed from is_gv_magical */
970 const char *end = name + len;
971 while (--end > name) {
972 if (!isDIGIT(*end)) return gv;
979 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
980 be case '\0' in this switch statement (ie a default case) */
986 sv_type == SVt_PVAV ||
987 sv_type == SVt_PVHV ||
988 sv_type == SVt_PVCV ||
989 sv_type == SVt_PVFM ||
992 PL_sawampersand = TRUE;
996 sv_setpv(GvSV(gv),PL_chopset);
1000 #ifdef COMPLEX_STATUS
1001 (void)SvUPGRADE(GvSV(gv), SVt_PVLV);
1007 /* If %! has been used, automatically load Errno.pm.
1008 The require will itself set errno, so in order to
1009 preserve its value we have to set up the magic
1010 now (rather than going to magicalize)
1013 sv_magic(GvSV(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1015 if (sv_type == SVt_PVHV)
1022 sv_magic((SV*)av, Nullsv, PERL_MAGIC_regdata, Nullch, 0);
1027 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1028 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1029 "$* is no longer supported");
1032 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1033 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1034 "Use of $# is deprecated");
1037 sv_setiv(GvSV(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1043 sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, Nullch, 0);
1047 case '\023': /* $^S */
1058 SvREADONLY_on(GvSV(gv));
1073 case '\001': /* $^A */
1074 case '\003': /* $^C */
1075 case '\004': /* $^D */
1076 case '\005': /* $^E */
1077 case '\006': /* $^F */
1078 case '\010': /* $^H */
1079 case '\011': /* $^I, NOT \t in EBCDIC */
1080 case '\016': /* $^N */
1081 case '\017': /* $^O */
1082 case '\020': /* $^P */
1083 case '\024': /* $^T */
1084 case '\027': /* $^W */
1086 sv_magic(GvSV(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1089 case '\014': /* $^L */
1090 sv_setpv(GvSV(gv),"\f");
1091 PL_formfeed = GvSV(gv);
1094 sv_setpv(GvSV(gv),"\034");
1099 if (!sv_derived_from(PL_patchlevel, "version"))
1100 (void *)upg_version(PL_patchlevel);
1101 GvSV(gv) = vnumify(PL_patchlevel);
1102 SvREADONLY_on(GvSV(gv));
1106 case '\026': /* $^V */
1108 SV * const sv = GvSV(gv);
1109 GvSV(gv) = new_version(PL_patchlevel);
1110 SvREADONLY_on(GvSV(gv));
1120 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1123 const HV * const hv = GvSTASH(gv);
1128 sv_setpv(sv, prefix ? prefix : "");
1134 if (keepmain || strNE(name, "main")) {
1136 sv_catpvn(sv,"::", 2);
1138 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1142 Perl_gv_fullname3(pTHX_ SV *sv, const GV *gv, const char *prefix)
1144 gv_fullname4(sv, gv, prefix, TRUE);
1148 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1150 const GV *egv = GvEGV(gv);
1153 gv_fullname4(sv, egv, prefix, keepmain);
1157 Perl_gv_efullname3(pTHX_ SV *sv, const GV *gv, const char *prefix)
1159 gv_efullname4(sv, gv, prefix, TRUE);
1162 /* compatibility with versions <= 5.003. */
1164 Perl_gv_fullname(pTHX_ SV *sv, const GV *gv)
1166 gv_fullname3(sv, gv, sv == (const SV*)gv ? "*" : "");
1169 /* compatibility with versions <= 5.003. */
1171 Perl_gv_efullname(pTHX_ SV *sv, const GV *gv)
1173 gv_efullname3(sv, gv, sv == (const SV*)gv ? "*" : "");
1182 io = (IO*)NEWSV(0,0);
1183 sv_upgrade((SV *)io,SVt_PVIO);
1186 /* Clear the stashcache because a new IO could overrule a
1188 hv_clear(PL_stashcache);
1189 iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV);
1190 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1191 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1192 iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV);
1193 SvSTASH(io) = (HV*)SvREFCNT_inc(GvHV(iogv));
1198 Perl_gv_check(pTHX_ HV *stash)
1204 if (!HvARRAY(stash))
1206 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1208 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1209 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1210 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1212 if (hv != PL_defstash && hv != stash)
1213 gv_check(hv); /* nested package */
1215 else if (isALPHA(*HeKEY(entry))) {
1217 gv = (GV*)HeVAL(entry);
1218 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1221 /* performance hack: if filename is absolute and it's a standard
1222 * module, don't bother warning */
1224 && PERL_FILE_IS_ABSOLUTE(file)
1225 #ifdef MACOS_TRADITIONAL
1226 && (instr(file, ":lib:")
1228 && (instr(file, "/lib/")
1230 || instr(file, ".pm")))
1234 CopLINE_set(PL_curcop, GvLINE(gv));
1236 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1238 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1240 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1241 "Name \"%s::%s\" used only once: possible typo",
1242 HvNAME(stash), GvNAME(gv));
1249 Perl_newGVgen(pTHX_ const char *pack)
1251 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1255 /* hopefully this is only called on local symbol table entries */
1258 Perl_gp_ref(pTHX_ GP *gp)
1265 /* multi-named GPs cannot be used for method cache */
1266 SvREFCNT_dec(gp->gp_cv);
1271 /* Adding a new name to a subroutine invalidates method cache */
1272 PL_sub_generation++;
1279 Perl_gp_free(pTHX_ GV *gv)
1283 if (!gv || !(gp = GvGP(gv)))
1285 if (gp->gp_refcnt == 0) {
1286 if (ckWARN_d(WARN_INTERNAL))
1287 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1288 "Attempt to free unreferenced glob pointers"
1289 pTHX__FORMAT pTHX__VALUE);
1293 /* Deleting the name of a subroutine invalidates method cache */
1294 PL_sub_generation++;
1296 if (--gp->gp_refcnt > 0) {
1297 if (gp->gp_egv == gv)
1302 if (gp->gp_sv) SvREFCNT_dec(gp->gp_sv);
1303 if (gp->gp_av) SvREFCNT_dec(gp->gp_av);
1305 if (PL_stashcache && HvNAME(gp->gp_hv))
1306 hv_delete(PL_stashcache,
1307 HvNAME(gp->gp_hv), strlen(HvNAME(gp->gp_hv)),
1309 SvREFCNT_dec(gp->gp_hv);
1311 if (gp->gp_io) SvREFCNT_dec(gp->gp_io);
1312 if (gp->gp_cv) SvREFCNT_dec(gp->gp_cv);
1313 if (gp->gp_form) SvREFCNT_dec(gp->gp_form);
1320 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1322 AMT *amtp = (AMT*)mg->mg_ptr;
1325 if (amtp && AMT_AMAGIC(amtp)) {
1327 for (i = 1; i < NofAMmeth; i++) {
1328 CV *cv = amtp->table[i];
1330 SvREFCNT_dec((SV *) cv);
1331 amtp->table[i] = Nullcv;
1338 /* Updates and caches the CV's */
1341 Perl_Gv_AMupdate(pTHX_ HV *stash)
1345 MAGIC* mg=mg_find((SV*)stash, PERL_MAGIC_overload_table);
1346 AMT *amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
1349 if (mg && amtp->was_ok_am == PL_amagic_generation
1350 && amtp->was_ok_sub == PL_sub_generation)
1351 return (bool)AMT_OVERLOADED(amtp);
1352 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1354 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME(stash)) );
1357 amt.was_ok_am = PL_amagic_generation;
1358 amt.was_ok_sub = PL_sub_generation;
1359 amt.fallback = AMGfallNO;
1363 int filled = 0, have_ovl = 0;
1367 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1369 /* Try to find via inheritance. */
1370 gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1375 lim = DESTROY_amg; /* Skip overloading entries. */
1376 else if (SvTRUE(sv))
1377 amt.fallback=AMGfallYES;
1379 amt.fallback=AMGfallNEVER;
1381 for (i = 1; i < lim; i++)
1382 amt.table[i] = Nullcv;
1383 for (; i < NofAMmeth; i++) {
1384 const char *cooky = PL_AMG_names[i];
1385 /* Human-readable form, for debugging: */
1386 const char *cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1387 const STRLEN l = strlen(cooky);
1389 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of `%s' in package `%.256s'\n",
1390 cp, HvNAME(stash)) );
1391 /* don't fill the cache while looking up!
1392 Creation of inheritance stubs in intermediate packages may
1393 conflict with the logic of runtime method substitution.
1394 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1395 then we could have created stubs for "(+0" in A and C too.
1396 But if B overloads "bool", we may want to use it for
1397 numifying instead of C's "+0". */
1398 if (i >= DESTROY_amg)
1399 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1400 else /* Autoload taken care of below */
1401 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1403 if (gv && (cv = GvCV(gv))) {
1404 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1405 && strEQ(HvNAME(GvSTASH(CvGV(cv))), "overload")) {
1406 /* This is a hack to support autoloading..., while
1407 knowing *which* methods were declared as overloaded. */
1408 /* GvSV contains the name of the method. */
1411 DEBUG_o( Perl_deb(aTHX_ "Resolving method `%"SVf256\
1412 "' for overloaded `%s' in package `%.256s'\n",
1413 GvSV(gv), cp, HvNAME(stash)) );
1414 if (!SvPOK(GvSV(gv))
1415 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX(GvSV(gv)),
1418 /* Can be an import stub (created by `can'). */
1419 SV *gvsv = GvSV(gv);
1420 const char *name = SvPOK(gvsv) ? SvPVX(gvsv) : "???";
1421 Perl_croak(aTHX_ "%s method `%.256s' overloading `%s' "\
1422 "in package `%.256s'",
1423 (GvCVGEN(gv) ? "Stub found while resolving"
1425 name, cp, HvNAME(stash));
1427 cv = GvCV(gv = ngv);
1429 DEBUG_o( Perl_deb(aTHX_ "Overloading `%s' in package `%.256s' via `%.256s::%.256s' \n",
1430 cp, HvNAME(stash), HvNAME(GvSTASH(CvGV(cv))),
1431 GvNAME(CvGV(cv))) );
1433 if (i < DESTROY_amg)
1435 } else if (gv) { /* Autoloaded... */
1439 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1442 AMT_AMAGIC_on(&amt);
1444 AMT_OVERLOADED_on(&amt);
1445 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1446 (char*)&amt, sizeof(AMT));
1450 /* Here we have no table: */
1452 AMT_AMAGIC_off(&amt);
1453 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1454 (char*)&amt, sizeof(AMTS));
1460 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1466 if (!stash || !HvNAME(stash))
1468 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1472 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1474 amtp = (AMT*)mg->mg_ptr;
1475 if ( amtp->was_ok_am != PL_amagic_generation
1476 || amtp->was_ok_sub != PL_sub_generation )
1478 if (AMT_AMAGIC(amtp)) {
1479 ret = amtp->table[id];
1480 if (ret && isGV(ret)) { /* Autoloading stab */
1481 /* Passing it through may have resulted in a warning
1482 "Inherited AUTOLOAD for a non-method deprecated", since
1483 our caller is going through a function call, not a method call.
1484 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1485 GV *gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1498 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1502 CV **cvp=NULL, **ocvp=NULL;
1503 AMT *amtp=NULL, *oamtp=NULL;
1504 int off=0, off1, lr=0, assign=AMGf_assign & flags, notfound=0;
1505 int postpr = 0, force_cpy = 0, assignshift = assign ? 1 : 0;
1510 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1511 && (stash = SvSTASH(SvRV(left)))
1512 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1513 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1514 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1516 && ((cv = cvp[off=method+assignshift])
1517 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1523 cv = cvp[off=method])))) {
1524 lr = -1; /* Call method for left argument */
1526 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1529 /* look for substituted methods */
1530 /* In all the covered cases we should be called with assign==0. */
1534 if ((cv = cvp[off=add_ass_amg])
1535 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1536 right = &PL_sv_yes; lr = -1; assign = 1;
1541 if ((cv = cvp[off = subtr_ass_amg])
1542 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1543 right = &PL_sv_yes; lr = -1; assign = 1;
1547 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1550 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1553 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1556 (void)((cv = cvp[off=bool__amg])
1557 || (cv = cvp[off=numer_amg])
1558 || (cv = cvp[off=string_amg]));
1564 * SV* ref causes confusion with the interpreter variable of
1567 SV* tmpRef=SvRV(left);
1568 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1570 * Just to be extra cautious. Maybe in some
1571 * additional cases sv_setsv is safe, too.
1573 SV* newref = newSVsv(tmpRef);
1574 SvOBJECT_on(newref);
1575 SvSTASH(newref) = (HV*)SvREFCNT_inc(SvSTASH(tmpRef));
1581 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1582 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1583 SV* nullsv=sv_2mortal(newSViv(0));
1585 SV* lessp = amagic_call(left,nullsv,
1586 lt_amg,AMGf_noright);
1587 logic = SvTRUE(lessp);
1589 SV* lessp = amagic_call(left,nullsv,
1590 ncmp_amg,AMGf_noright);
1591 logic = (SvNV(lessp) < 0);
1594 if (off==subtr_amg) {
1605 if ((cv = cvp[off=subtr_amg])) {
1607 left = sv_2mortal(newSViv(0));
1612 case iter_amg: /* XXXX Eventually should do to_gv. */
1614 return NULL; /* Delegate operation to standard mechanisms. */
1622 return left; /* Delegate operation to standard mechanisms. */
1627 if (!cv) goto not_found;
1628 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1629 && (stash = SvSTASH(SvRV(right)))
1630 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1631 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1632 ? (amtp = (AMT*)mg->mg_ptr)->table
1634 && (cv = cvp[off=method])) { /* Method for right
1637 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1638 && (cvp=ocvp) && (lr = -1))
1639 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1640 && !(flags & AMGf_unary)) {
1641 /* We look for substitution for
1642 * comparison operations and
1644 if (method==concat_amg || method==concat_ass_amg
1645 || method==repeat_amg || method==repeat_ass_amg) {
1646 return NULL; /* Delegate operation to string conversion */
1656 postpr = 1; off=ncmp_amg; break;
1663 postpr = 1; off=scmp_amg; break;
1665 if (off != -1) cv = cvp[off];
1670 not_found: /* No method found, either report or croak */
1678 return left; /* Delegate operation to standard mechanisms. */
1681 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1682 notfound = 1; lr = -1;
1683 } else if (cvp && (cv=cvp[nomethod_amg])) {
1684 notfound = 1; lr = 1;
1687 if (off==-1) off=method;
1688 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1689 "Operation `%s': no method found,%sargument %s%s%s%s",
1690 AMG_id2name(method + assignshift),
1691 (flags & AMGf_unary ? " " : "\n\tleft "),
1693 "in overloaded package ":
1694 "has no overloaded magic",
1696 HvNAME(SvSTASH(SvRV(left))):
1699 ",\n\tright argument in overloaded package ":
1702 : ",\n\tright argument has no overloaded magic"),
1704 HvNAME(SvSTASH(SvRV(right))):
1706 if (amtp && amtp->fallback >= AMGfallYES) {
1707 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX(msg)) );
1709 Perl_croak(aTHX_ "%"SVf, msg);
1713 force_cpy = force_cpy || assign;
1718 DEBUG_o(Perl_deb(aTHX_
1719 "Overloaded operator `%s'%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1721 method+assignshift==off? "" :
1723 method+assignshift==off? "" :
1724 AMG_id2name(method+assignshift),
1725 method+assignshift==off? "" : "')",
1726 flags & AMGf_unary? "" :
1727 lr==1 ? " for right argument": " for left argument",
1728 flags & AMGf_unary? " for argument" : "",
1729 stash ? HvNAME(stash) : "null",
1730 fl? ",\n\tassignment variant used": "") );
1733 /* Since we use shallow copy during assignment, we need
1734 * to dublicate the contents, probably calling user-supplied
1735 * version of copy operator
1737 /* We need to copy in following cases:
1738 * a) Assignment form was called.
1739 * assignshift==1, assign==T, method + 1 == off
1740 * b) Increment or decrement, called directly.
1741 * assignshift==0, assign==0, method + 0 == off
1742 * c) Increment or decrement, translated to assignment add/subtr.
1743 * assignshift==0, assign==T,
1745 * d) Increment or decrement, translated to nomethod.
1746 * assignshift==0, assign==0,
1748 * e) Assignment form translated to nomethod.
1749 * assignshift==1, assign==T, method + 1 != off
1752 /* off is method, method+assignshift, or a result of opcode substitution.
1753 * In the latter case assignshift==0, so only notfound case is important.
1755 if (( (method + assignshift == off)
1756 && (assign || (method == inc_amg) || (method == dec_amg)))
1763 bool oldcatch = CATCH_GET;
1766 Zero(&myop, 1, BINOP);
1767 myop.op_last = (OP *) &myop;
1768 myop.op_next = Nullop;
1769 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1771 PUSHSTACKi(PERLSI_OVERLOAD);
1774 PL_op = (OP *) &myop;
1775 if (PERLDB_SUB && PL_curstash != PL_debstash)
1776 PL_op->op_private |= OPpENTERSUB_DB;
1780 EXTEND(SP, notfound + 5);
1781 PUSHs(lr>0? right: left);
1782 PUSHs(lr>0? left: right);
1783 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1785 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1790 if ((PL_op = Perl_pp_entersub(aTHX)))
1798 CATCH_SET(oldcatch);
1805 ans=SvIV(res)<=0; break;
1808 ans=SvIV(res)<0; break;
1811 ans=SvIV(res)>=0; break;
1814 ans=SvIV(res)>0; break;
1817 ans=SvIV(res)==0; break;
1820 ans=SvIV(res)!=0; break;
1823 SvSetSV(left,res); return left;
1825 ans=!SvTRUE(res); break;
1828 } else if (method==copy_amg) {
1830 Perl_croak(aTHX_ "Copy method did not return a reference");
1832 return SvREFCNT_inc(SvRV(res));
1840 =for apidoc is_gv_magical_sv
1842 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
1848 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
1851 const char *temp = SvPV(name, len);
1852 return is_gv_magical(temp, len, flags);
1856 =for apidoc is_gv_magical
1858 Returns C<TRUE> if given the name of a magical GV.
1860 Currently only useful internally when determining if a GV should be
1861 created even in rvalue contexts.
1863 C<flags> is not used at present but available for future extension to
1864 allow selecting particular classes of magical variable.
1866 Currently assumes that C<name> is NUL terminated (as well as len being valid).
1867 This assumption is met by all callers within the perl core, which all pass
1868 pointers returned by SvPV.
1873 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
1877 const char *name1 = name + 1;
1880 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
1884 if (len == 8 && strEQ(name1, "VERLOAD"))
1888 if (len == 3 && name[1] == 'I' && name[2] == 'G')
1891 /* Using ${^...} variables is likely to be sufficiently rare that
1892 it seems sensible to avoid the space hit of also checking the
1894 case '\017': /* ${^OPEN} */
1895 if (strEQ(name1, "PEN"))
1898 case '\024': /* ${^TAINT} */
1899 if (strEQ(name1, "AINT"))
1902 case '\025': /* ${^UNICODE} */
1903 if (strEQ(name1, "NICODE"))
1905 if (strEQ(name1, "TF8LOCALE"))
1908 case '\027': /* ${^WARNING_BITS} */
1909 if (strEQ(name1, "ARNING_BITS"))
1922 const char *end = name + len;
1923 while (--end > name) {
1931 /* Because we're already assuming that name is NUL terminated
1932 below, we can treat an empty name as "\0" */
1959 case '\001': /* $^A */
1960 case '\003': /* $^C */
1961 case '\004': /* $^D */
1962 case '\005': /* $^E */
1963 case '\006': /* $^F */
1964 case '\010': /* $^H */
1965 case '\011': /* $^I, NOT \t in EBCDIC */
1966 case '\014': /* $^L */
1967 case '\016': /* $^N */
1968 case '\017': /* $^O */
1969 case '\020': /* $^P */
1970 case '\023': /* $^S */
1971 case '\024': /* $^T */
1972 case '\026': /* $^V */
1973 case '\027': /* $^W */