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;
676 I32 utf8 = flags & SVf_UTF8;
678 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
681 for (namend = name; *namend; namend++) {
682 if ((*namend == ':' && namend[1] == ':')
683 || (*namend == '\'' && namend[1]))
687 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
695 if (len + 3 < sizeof (smallbuf))
698 New(601, tmpbuf, len+3, char);
699 Copy(name, tmpbuf, len, char);
703 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
704 gv = gvp ? *gvp : Nullgv;
705 if (gv && gv != (GV*)&PL_sv_undef) {
706 if (SvTYPE(gv) != SVt_PVGV)
707 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
711 if (tmpbuf != smallbuf)
713 if (!gv || gv == (GV*)&PL_sv_undef)
716 if (!(stash = GvHV(gv)))
717 stash = GvHV(gv) = newHV();
720 HvNAME(stash) = savepvn(nambeg, namend - nambeg);
728 return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE);
733 /* No stash in name, so see how we can default */
736 if (isIDFIRST_lazy(name)) {
739 /* name is always \0 terminated, and initial \0 wouldn't return
740 true from isIDFIRST_lazy, so we know that name[1] is defined */
747 if (strEQ(name, "INC") || strEQ(name, "ENV"))
751 if (strEQ(name, "SIG"))
755 if (strEQ(name, "STDIN") || strEQ(name, "STDOUT") ||
756 strEQ(name, "STDERR"))
760 if (strEQ(name, "ARGV") || strEQ(name, "ARGVOUT"))
767 else if (IN_PERL_COMPILETIME) {
769 if (add && (PL_hints & HINT_STRICT_VARS) &&
770 sv_type != SVt_PVCV &&
771 sv_type != SVt_PVGV &&
772 sv_type != SVt_PVFM &&
773 sv_type != SVt_PVIO &&
774 !(len == 1 && sv_type == SVt_PV &&
775 (*name == 'a' || *name == 'b')) )
777 gvp = (GV**)hv_fetch(stash,name,len,0);
779 *gvp == (GV*)&PL_sv_undef ||
780 SvTYPE(*gvp) != SVt_PVGV)
784 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
785 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
786 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
788 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
789 sv_type == SVt_PVAV ? '@' :
790 sv_type == SVt_PVHV ? '%' : '$',
793 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
799 stash = CopSTASH(PL_curcop);
805 /* By this point we should have a stash and a name */
809 register SV *err = Perl_mess(aTHX_
810 "Global symbol \"%s%s\" requires explicit package name",
811 (sv_type == SVt_PV ? "$"
812 : sv_type == SVt_PVAV ? "@"
813 : sv_type == SVt_PVHV ? "%"
815 if (USE_UTF8_IN_NAMES)
818 stash = GvHV(gv_fetchpv("<none>::", GV_ADDMULTI, SVt_PVHV));
824 if (!SvREFCNT(stash)) /* symbol table under destruction */
827 gvp = (GV**)hv_fetch(stash,name,len,add);
828 if (!gvp || *gvp == (GV*)&PL_sv_undef)
831 if (SvTYPE(gv) == SVt_PVGV) {
834 gv_init_sv(gv, sv_type);
835 if (*name=='!' && sv_type == SVt_PVHV && len==1)
839 } else if (add & GV_NOINIT) {
843 /* Adding a new symbol */
845 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
846 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
847 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
848 gv_init_sv(gv, sv_type);
850 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
851 : (PL_dowarn & G_WARN_ON ) ) )
854 /* set up magic where warranted */
858 /* Nothing else to do.
859 The compiler will probably turn the switch statement into a
860 branch table. Make sure we avoid even that small overhead for
861 the common case of lower case variable names. */
865 const char *name2 = name + 1;
868 if (strEQ(name2, "RGV")) {
869 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
873 if (strnEQ(name2, "XPORT", 5))
877 if (strEQ(name2, "SA")) {
880 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, Nullch, 0);
881 /* NOTE: No support for tied ISA */
882 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
883 && AvFILLp(av) == -1)
886 av_push(av, newSVpvn(pname = "NDBM_File",9));
887 gv_stashpvn(pname, 9, TRUE);
888 av_push(av, newSVpvn(pname = "DB_File",7));
889 gv_stashpvn(pname, 7, TRUE);
890 av_push(av, newSVpvn(pname = "GDBM_File",9));
891 gv_stashpvn(pname, 9, TRUE);
892 av_push(av, newSVpvn(pname = "SDBM_File",9));
893 gv_stashpvn(pname, 9, TRUE);
894 av_push(av, newSVpvn(pname = "ODBM_File",9));
895 gv_stashpvn(pname, 9, TRUE);
900 if (strEQ(name2, "VERLOAD")) {
903 hv_magic(hv, Nullgv, PERL_MAGIC_overload);
907 if (strEQ(name2, "IG")) {
911 Newz(73, PL_psig_ptr, SIG_SIZE, SV*);
912 Newz(73, PL_psig_name, SIG_SIZE, SV*);
913 Newz(73, PL_psig_pend, SIG_SIZE, int);
917 hv_magic(hv, Nullgv, PERL_MAGIC_sig);
918 for (i = 1; i < SIG_SIZE; i++) {
920 init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
922 sv_setsv(*init, &PL_sv_undef);
930 if (strEQ(name2, "ERSION"))
933 case '\005': /* $^ENCODING */
934 if (strEQ(name2, "NCODING"))
937 case '\017': /* $^OPEN */
938 if (strEQ(name2, "PEN"))
941 case '\024': /* ${^TAINT} */
942 if (strEQ(name2, "AINT"))
945 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
946 if (strEQ(name2, "NICODE"))
948 if (strEQ(name2, "TF8LOCALE"))
951 case '\027': /* $^WARNING_BITS */
952 if (strEQ(name2, "ARNING_BITS"))
965 /* ensures variable is only digits */
966 /* ${"1foo"} fails this test (and is thus writeable) */
967 /* added by japhy, but borrowed from is_gv_magical */
968 const char *end = name + len;
969 while (--end > name) {
970 if (!isDIGIT(*end)) return gv;
977 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
978 be case '\0' in this switch statement (ie a default case) */
984 sv_type == SVt_PVAV ||
985 sv_type == SVt_PVHV ||
986 sv_type == SVt_PVCV ||
987 sv_type == SVt_PVFM ||
990 PL_sawampersand = TRUE;
994 sv_setpv(GvSV(gv),PL_chopset);
998 #ifdef COMPLEX_STATUS
999 (void)SvUPGRADE(GvSV(gv), SVt_PVLV);
1005 /* If %! has been used, automatically load Errno.pm.
1006 The require will itself set errno, so in order to
1007 preserve its value we have to set up the magic
1008 now (rather than going to magicalize)
1011 sv_magic(GvSV(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1013 if (sv_type == SVt_PVHV)
1020 sv_magic((SV*)av, Nullsv, PERL_MAGIC_regdata, Nullch, 0);
1025 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1026 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1027 "$* is no longer supported");
1030 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1031 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1032 "Use of $# is deprecated");
1035 sv_setiv(GvSV(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1041 sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, Nullch, 0);
1045 case '\023': /* $^S */
1056 SvREADONLY_on(GvSV(gv));
1071 case '\001': /* $^A */
1072 case '\003': /* $^C */
1073 case '\004': /* $^D */
1074 case '\005': /* $^E */
1075 case '\006': /* $^F */
1076 case '\010': /* $^H */
1077 case '\011': /* $^I, NOT \t in EBCDIC */
1078 case '\016': /* $^N */
1079 case '\017': /* $^O */
1080 case '\020': /* $^P */
1081 case '\024': /* $^T */
1082 case '\027': /* $^W */
1084 sv_magic(GvSV(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1087 case '\014': /* $^L */
1088 sv_setpv(GvSV(gv),"\f");
1089 PL_formfeed = GvSV(gv);
1092 sv_setpv(GvSV(gv),"\034");
1097 if (!sv_derived_from(PL_patchlevel, "version"))
1098 (void *)upg_version(PL_patchlevel);
1099 GvSV(gv) = vnumify(PL_patchlevel);
1100 SvREADONLY_on(GvSV(gv));
1104 case '\026': /* $^V */
1107 GvSV(gv) = new_version(PL_patchlevel);
1108 SvREADONLY_on(GvSV(gv));
1118 Perl_gv_fullname4(pTHX_ SV *sv, GV *gv, const char *prefix, bool keepmain)
1121 HV *hv = GvSTASH(gv);
1126 sv_setpv(sv, prefix ? prefix : "");
1132 if (keepmain || strNE(name, "main")) {
1134 sv_catpvn(sv,"::", 2);
1136 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1140 Perl_gv_fullname3(pTHX_ SV *sv, GV *gv, const char *prefix)
1142 gv_fullname4(sv, gv, prefix, TRUE);
1146 Perl_gv_efullname4(pTHX_ SV *sv, GV *gv, const char *prefix, bool keepmain)
1148 GV *egv = GvEGV(gv);
1151 gv_fullname4(sv, egv, prefix, keepmain);
1155 Perl_gv_efullname3(pTHX_ SV *sv, GV *gv, const char *prefix)
1157 gv_efullname4(sv, gv, prefix, TRUE);
1160 /* XXX compatibility with versions <= 5.003. */
1162 Perl_gv_fullname(pTHX_ SV *sv, GV *gv)
1164 gv_fullname3(sv, gv, sv == (SV*)gv ? "*" : "");
1167 /* XXX compatibility with versions <= 5.003. */
1169 Perl_gv_efullname(pTHX_ SV *sv, GV *gv)
1171 gv_efullname3(sv, gv, sv == (SV*)gv ? "*" : "");
1180 io = (IO*)NEWSV(0,0);
1181 sv_upgrade((SV *)io,SVt_PVIO);
1184 /* Clear the stashcache because a new IO could overrule a
1186 hv_clear(PL_stashcache);
1187 iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV);
1188 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1189 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1190 iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV);
1191 SvSTASH(io) = (HV*)SvREFCNT_inc(GvHV(iogv));
1196 Perl_gv_check(pTHX_ HV *stash)
1203 if (!HvARRAY(stash))
1205 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1206 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1207 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1208 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1210 if (hv != PL_defstash && hv != stash)
1211 gv_check(hv); /* nested package */
1213 else if (isALPHA(*HeKEY(entry))) {
1215 gv = (GV*)HeVAL(entry);
1216 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1219 /* performance hack: if filename is absolute and it's a standard
1220 * module, don't bother warning */
1222 && PERL_FILE_IS_ABSOLUTE(file)
1223 #ifdef MACOS_TRADITIONAL
1224 && (instr(file, ":lib:")
1226 && (instr(file, "/lib/")
1228 || instr(file, ".pm")))
1232 CopLINE_set(PL_curcop, GvLINE(gv));
1234 CopFILE(PL_curcop) = file; /* set for warning */
1236 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1238 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1239 "Name \"%s::%s\" used only once: possible typo",
1240 HvNAME(stash), GvNAME(gv));
1247 Perl_newGVgen(pTHX_ char *pack)
1249 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1253 /* hopefully this is only called on local symbol table entries */
1256 Perl_gp_ref(pTHX_ GP *gp)
1263 /* multi-named GPs cannot be used for method cache */
1264 SvREFCNT_dec(gp->gp_cv);
1269 /* Adding a new name to a subroutine invalidates method cache */
1270 PL_sub_generation++;
1277 Perl_gp_free(pTHX_ GV *gv)
1281 if (!gv || !(gp = GvGP(gv)))
1283 if (gp->gp_refcnt == 0) {
1284 if (ckWARN_d(WARN_INTERNAL))
1285 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1286 "Attempt to free unreferenced glob pointers"
1287 pTHX__FORMAT pTHX__VALUE);
1291 /* Deleting the name of a subroutine invalidates method cache */
1292 PL_sub_generation++;
1294 if (--gp->gp_refcnt > 0) {
1295 if (gp->gp_egv == gv)
1300 if (gp->gp_sv) SvREFCNT_dec(gp->gp_sv);
1301 if (gp->gp_av) SvREFCNT_dec(gp->gp_av);
1303 if (PL_stashcache && HvNAME(gp->gp_hv))
1304 hv_delete(PL_stashcache,
1305 HvNAME(gp->gp_hv), strlen(HvNAME(gp->gp_hv)),
1307 SvREFCNT_dec(gp->gp_hv);
1309 if (gp->gp_io) SvREFCNT_dec(gp->gp_io);
1310 if (gp->gp_cv) SvREFCNT_dec(gp->gp_cv);
1311 if (gp->gp_form) SvREFCNT_dec(gp->gp_form);
1318 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1320 AMT *amtp = (AMT*)mg->mg_ptr;
1321 if (amtp && AMT_AMAGIC(amtp)) {
1323 for (i = 1; i < NofAMmeth; i++) {
1324 CV *cv = amtp->table[i];
1326 SvREFCNT_dec((SV *) cv);
1327 amtp->table[i] = Nullcv;
1334 /* Updates and caches the CV's */
1337 Perl_Gv_AMupdate(pTHX_ HV *stash)
1341 MAGIC* mg=mg_find((SV*)stash, PERL_MAGIC_overload_table);
1342 AMT *amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
1345 if (mg && amtp->was_ok_am == PL_amagic_generation
1346 && amtp->was_ok_sub == PL_sub_generation)
1347 return (bool)AMT_OVERLOADED(amtp);
1348 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1350 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME(stash)) );
1353 amt.was_ok_am = PL_amagic_generation;
1354 amt.was_ok_sub = PL_sub_generation;
1355 amt.fallback = AMGfallNO;
1359 int filled = 0, have_ovl = 0;
1363 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1365 /* Try to find via inheritance. */
1366 gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1371 lim = DESTROY_amg; /* Skip overloading entries. */
1372 else if (SvTRUE(sv))
1373 amt.fallback=AMGfallYES;
1375 amt.fallback=AMGfallNEVER;
1377 for (i = 1; i < lim; i++)
1378 amt.table[i] = Nullcv;
1379 for (; i < NofAMmeth; i++) {
1380 char *cooky = (char*)PL_AMG_names[i];
1381 /* Human-readable form, for debugging: */
1382 char *cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1383 STRLEN l = strlen(cooky);
1385 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of `%s' in package `%.256s'\n",
1386 cp, HvNAME(stash)) );
1387 /* don't fill the cache while looking up!
1388 Creation of inheritance stubs in intermediate packages may
1389 conflict with the logic of runtime method substitution.
1390 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1391 then we could have created stubs for "(+0" in A and C too.
1392 But if B overloads "bool", we may want to use it for
1393 numifying instead of C's "+0". */
1394 if (i >= DESTROY_amg)
1395 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1396 else /* Autoload taken care of below */
1397 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1399 if (gv && (cv = GvCV(gv))) {
1400 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1401 && strEQ(HvNAME(GvSTASH(CvGV(cv))), "overload")) {
1402 /* This is a hack to support autoloading..., while
1403 knowing *which* methods were declared as overloaded. */
1404 /* GvSV contains the name of the method. */
1407 DEBUG_o( Perl_deb(aTHX_ "Resolving method `%"SVf256\
1408 "' for overloaded `%s' in package `%.256s'\n",
1409 GvSV(gv), cp, HvNAME(stash)) );
1410 if (!SvPOK(GvSV(gv))
1411 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX(GvSV(gv)),
1414 /* Can be an import stub (created by `can'). */
1415 SV *gvsv = GvSV(gv);
1416 const char *name = SvPOK(gvsv) ? SvPVX(gvsv) : "???";
1417 Perl_croak(aTHX_ "%s method `%.256s' overloading `%s' "\
1418 "in package `%.256s'",
1419 (GvCVGEN(gv) ? "Stub found while resolving"
1421 name, cp, HvNAME(stash));
1423 cv = GvCV(gv = ngv);
1425 DEBUG_o( Perl_deb(aTHX_ "Overloading `%s' in package `%.256s' via `%.256s::%.256s' \n",
1426 cp, HvNAME(stash), HvNAME(GvSTASH(CvGV(cv))),
1427 GvNAME(CvGV(cv))) );
1429 if (i < DESTROY_amg)
1431 } else if (gv) { /* Autoloaded... */
1435 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1438 AMT_AMAGIC_on(&amt);
1440 AMT_OVERLOADED_on(&amt);
1441 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1442 (char*)&amt, sizeof(AMT));
1446 /* Here we have no table: */
1448 AMT_AMAGIC_off(&amt);
1449 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1450 (char*)&amt, sizeof(AMTS));
1456 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1462 if (!stash || !HvNAME(stash))
1464 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1468 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1470 amtp = (AMT*)mg->mg_ptr;
1471 if ( amtp->was_ok_am != PL_amagic_generation
1472 || amtp->was_ok_sub != PL_sub_generation )
1474 if (AMT_AMAGIC(amtp)) {
1475 ret = amtp->table[id];
1476 if (ret && isGV(ret)) { /* Autoloading stab */
1477 /* Passing it through may have resulted in a warning
1478 "Inherited AUTOLOAD for a non-method deprecated", since
1479 our caller is going through a function call, not a method call.
1480 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1481 GV *gv = gv_fetchmethod(stash, (char*)PL_AMG_names[id]);
1494 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1498 CV **cvp=NULL, **ocvp=NULL;
1499 AMT *amtp=NULL, *oamtp=NULL;
1500 int off=0, off1, lr=0, assign=AMGf_assign & flags, notfound=0;
1501 int postpr = 0, force_cpy = 0, assignshift = assign ? 1 : 0;
1506 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1507 && (stash = SvSTASH(SvRV(left)))
1508 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1509 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1510 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1512 && ((cv = cvp[off=method+assignshift])
1513 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1519 cv = cvp[off=method])))) {
1520 lr = -1; /* Call method for left argument */
1522 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1525 /* look for substituted methods */
1526 /* In all the covered cases we should be called with assign==0. */
1530 if ((cv = cvp[off=add_ass_amg])
1531 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1532 right = &PL_sv_yes; lr = -1; assign = 1;
1537 if ((cv = cvp[off = subtr_ass_amg])
1538 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1539 right = &PL_sv_yes; lr = -1; assign = 1;
1543 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1546 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1549 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1552 (void)((cv = cvp[off=bool__amg])
1553 || (cv = cvp[off=numer_amg])
1554 || (cv = cvp[off=string_amg]));
1560 * SV* ref causes confusion with the interpreter variable of
1563 SV* tmpRef=SvRV(left);
1564 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1566 * Just to be extra cautious. Maybe in some
1567 * additional cases sv_setsv is safe, too.
1569 SV* newref = newSVsv(tmpRef);
1570 SvOBJECT_on(newref);
1571 SvSTASH(newref) = (HV*)SvREFCNT_inc(SvSTASH(tmpRef));
1577 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1578 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1579 SV* nullsv=sv_2mortal(newSViv(0));
1581 SV* lessp = amagic_call(left,nullsv,
1582 lt_amg,AMGf_noright);
1583 logic = SvTRUE(lessp);
1585 SV* lessp = amagic_call(left,nullsv,
1586 ncmp_amg,AMGf_noright);
1587 logic = (SvNV(lessp) < 0);
1590 if (off==subtr_amg) {
1601 if ((cv = cvp[off=subtr_amg])) {
1603 left = sv_2mortal(newSViv(0));
1608 case iter_amg: /* XXXX Eventually should do to_gv. */
1610 return NULL; /* Delegate operation to standard mechanisms. */
1618 return left; /* Delegate operation to standard mechanisms. */
1623 if (!cv) goto not_found;
1624 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1625 && (stash = SvSTASH(SvRV(right)))
1626 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1627 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1628 ? (amtp = (AMT*)mg->mg_ptr)->table
1630 && (cv = cvp[off=method])) { /* Method for right
1633 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1634 && (cvp=ocvp) && (lr = -1))
1635 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1636 && !(flags & AMGf_unary)) {
1637 /* We look for substitution for
1638 * comparison operations and
1640 if (method==concat_amg || method==concat_ass_amg
1641 || method==repeat_amg || method==repeat_ass_amg) {
1642 return NULL; /* Delegate operation to string conversion */
1652 postpr = 1; off=ncmp_amg; break;
1659 postpr = 1; off=scmp_amg; break;
1661 if (off != -1) cv = cvp[off];
1666 not_found: /* No method found, either report or croak */
1674 return left; /* Delegate operation to standard mechanisms. */
1677 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1678 notfound = 1; lr = -1;
1679 } else if (cvp && (cv=cvp[nomethod_amg])) {
1680 notfound = 1; lr = 1;
1683 if (off==-1) off=method;
1684 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1685 "Operation `%s': no method found,%sargument %s%s%s%s",
1686 AMG_id2name(method + assignshift),
1687 (flags & AMGf_unary ? " " : "\n\tleft "),
1689 "in overloaded package ":
1690 "has no overloaded magic",
1692 HvNAME(SvSTASH(SvRV(left))):
1695 ",\n\tright argument in overloaded package ":
1698 : ",\n\tright argument has no overloaded magic"),
1700 HvNAME(SvSTASH(SvRV(right))):
1702 if (amtp && amtp->fallback >= AMGfallYES) {
1703 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX(msg)) );
1705 Perl_croak(aTHX_ "%"SVf, msg);
1709 force_cpy = force_cpy || assign;
1714 DEBUG_o(Perl_deb(aTHX_
1715 "Overloaded operator `%s'%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1717 method+assignshift==off? "" :
1719 method+assignshift==off? "" :
1720 AMG_id2name(method+assignshift),
1721 method+assignshift==off? "" : "')",
1722 flags & AMGf_unary? "" :
1723 lr==1 ? " for right argument": " for left argument",
1724 flags & AMGf_unary? " for argument" : "",
1725 stash ? HvNAME(stash) : "null",
1726 fl? ",\n\tassignment variant used": "") );
1729 /* Since we use shallow copy during assignment, we need
1730 * to dublicate the contents, probably calling user-supplied
1731 * version of copy operator
1733 /* We need to copy in following cases:
1734 * a) Assignment form was called.
1735 * assignshift==1, assign==T, method + 1 == off
1736 * b) Increment or decrement, called directly.
1737 * assignshift==0, assign==0, method + 0 == off
1738 * c) Increment or decrement, translated to assignment add/subtr.
1739 * assignshift==0, assign==T,
1741 * d) Increment or decrement, translated to nomethod.
1742 * assignshift==0, assign==0,
1744 * e) Assignment form translated to nomethod.
1745 * assignshift==1, assign==T, method + 1 != off
1748 /* off is method, method+assignshift, or a result of opcode substitution.
1749 * In the latter case assignshift==0, so only notfound case is important.
1751 if (( (method + assignshift == off)
1752 && (assign || (method == inc_amg) || (method == dec_amg)))
1759 bool oldcatch = CATCH_GET;
1762 Zero(&myop, 1, BINOP);
1763 myop.op_last = (OP *) &myop;
1764 myop.op_next = Nullop;
1765 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1767 PUSHSTACKi(PERLSI_OVERLOAD);
1770 PL_op = (OP *) &myop;
1771 if (PERLDB_SUB && PL_curstash != PL_debstash)
1772 PL_op->op_private |= OPpENTERSUB_DB;
1776 EXTEND(SP, notfound + 5);
1777 PUSHs(lr>0? right: left);
1778 PUSHs(lr>0? left: right);
1779 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1781 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1786 if ((PL_op = Perl_pp_entersub(aTHX)))
1794 CATCH_SET(oldcatch);
1801 ans=SvIV(res)<=0; break;
1804 ans=SvIV(res)<0; break;
1807 ans=SvIV(res)>=0; break;
1810 ans=SvIV(res)>0; break;
1813 ans=SvIV(res)==0; break;
1816 ans=SvIV(res)!=0; break;
1819 SvSetSV(left,res); return left;
1821 ans=!SvTRUE(res); break;
1824 } else if (method==copy_amg) {
1826 Perl_croak(aTHX_ "Copy method did not return a reference");
1828 return SvREFCNT_inc(SvRV(res));
1836 =for apidoc is_gv_magical
1838 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
1844 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
1847 char *temp = SvPV(name, len);
1848 return is_gv_magical(temp, len, flags);
1852 =for apidoc is_gv_magical
1854 Returns C<TRUE> if given the name of a magical GV.
1856 Currently only useful internally when determining if a GV should be
1857 created even in rvalue contexts.
1859 C<flags> is not used at present but available for future extension to
1860 allow selecting particular classes of magical variable.
1862 Currently assumes that C<name> is NUL terminated (as well as len being valid).
1863 This assumption is met by all callers within the perl core, which all pass
1864 pointers returned by SvPV.
1869 Perl_is_gv_magical(pTHX_ char *name, STRLEN len, U32 flags)
1872 const char *name1 = name + 1;
1875 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
1879 if (len == 8 && strEQ(name1, "VERLOAD"))
1883 if (len == 3 && name[1] == 'I' && name[2] == 'G')
1886 /* Using ${^...} variables is likely to be sufficiently rare that
1887 it seems sensible to avoid the space hit of also checking the
1889 case '\017': /* ${^OPEN} */
1890 if (strEQ(name1, "PEN"))
1893 case '\024': /* ${^TAINT} */
1894 if (strEQ(name1, "AINT"))
1897 case '\025': /* ${^UNICODE} */
1898 if (strEQ(name1, "NICODE"))
1900 if (strEQ(name1, "TF8LOCALE"))
1903 case '\027': /* ${^WARNING_BITS} */
1904 if (strEQ(name1, "ARNING_BITS"))
1917 char *end = name + len;
1918 while (--end > name) {
1926 /* Because we're already assuming that name is NUL terminated
1927 below, we can treat an empty name as "\0" */
1954 case '\001': /* $^A */
1955 case '\003': /* $^C */
1956 case '\004': /* $^D */
1957 case '\005': /* $^E */
1958 case '\006': /* $^F */
1959 case '\010': /* $^H */
1960 case '\011': /* $^I, NOT \t in EBCDIC */
1961 case '\014': /* $^L */
1962 case '\016': /* $^N */
1963 case '\017': /* $^O */
1964 case '\020': /* $^P */
1965 case '\023': /* $^S */
1966 case '\024': /* $^T */
1967 case '\026': /* $^V */
1968 case '\027': /* $^W */