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)
110 const bool doproto = SvTYPE(gv) > SVt_NULL;
111 char *proto = (doproto && SvPOK(gv)) ? SvPVX(gv) : NULL;
113 sv_upgrade((SV*)gv, SVt_PVGV);
122 Newz(602, gp, 1, GP);
123 GvGP(gv) = gp_ref(gp);
124 GvSV(gv) = NEWSV(72,0);
125 GvLINE(gv) = CopLINE(PL_curcop);
126 /* XXX Ideally this cast would be replaced with a change to const char*
128 GvFILE(gv) = CopFILE(PL_curcop) ? CopFILE(PL_curcop) : (char *) "";
131 sv_magic((SV*)gv, (SV*)gv, PERL_MAGIC_glob, Nullch, 0);
132 GvSTASH(gv) = (HV*)SvREFCNT_inc(stash);
133 GvNAME(gv) = savepvn(name, len);
135 if (multi || doproto) /* doproto means it _was_ mentioned */
137 if (doproto) { /* Replicate part of newSUB here. */
140 /* XXX unsafe for threads if eval_owner isn't held */
141 start_subparse(0,0); /* Create CV in compcv. */
142 GvCV(gv) = PL_compcv;
147 CvFILE_set_from_cop(GvCV(gv), PL_curcop);
148 CvSTASH(GvCV(gv)) = PL_curstash;
150 sv_setpv((SV*)GvCV(gv), proto);
157 S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
173 =for apidoc gv_fetchmeth
175 Returns the glob with the given C<name> and a defined subroutine or
176 C<NULL>. The glob lives in the given C<stash>, or in the stashes
177 accessible via @ISA and UNIVERSAL::.
179 The argument C<level> should be either 0 or -1. If C<level==0>, as a
180 side-effect creates a glob with the given C<name> in the given C<stash>
181 which in the case of success contains an alias for the subroutine, and sets
182 up caching info for this glob. Similarly for all the searched stashes.
184 This function grants C<"SUPER"> token as a postfix of the stash name. The
185 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
186 visible to Perl code. So when calling C<call_sv>, you should not use
187 the GV directly; instead, you should use the method's CV, which can be
188 obtained from the GV with the C<GvCV> macro.
194 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
202 /* UNIVERSAL methods should be callable without a stash */
204 level = -1; /* probably appropriate */
205 if(!(stash = gv_stashpvn("UNIVERSAL", 9, FALSE)))
211 "Can't use anonymous symbol table for method lookup");
213 if ((level > 100) || (level < -100))
214 Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
215 name, HvNAME(stash));
217 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,HvNAME(stash)) );
219 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
224 if (SvTYPE(topgv) != SVt_PVGV)
225 gv_init(topgv, stash, name, len, TRUE);
226 if ((cv = GvCV(topgv))) {
227 /* If genuine method or valid cache entry, use it */
228 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
230 /* Stale cached entry: junk it */
232 GvCV(topgv) = cv = Nullcv;
235 else if (GvCVGEN(topgv) == PL_sub_generation)
236 return 0; /* cache indicates sub doesn't exist */
239 gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE);
240 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : Nullav;
242 /* create and re-create @.*::SUPER::ISA on demand */
243 if (!av || !SvMAGIC(av)) {
244 const char* packname = HvNAME(stash);
245 STRLEN packlen = strlen(packname);
247 if (packlen >= 7 && strEQ(packname + packlen - 7, "::SUPER")) {
251 basestash = gv_stashpvn(packname, packlen, TRUE);
252 gvp = (GV**)hv_fetch(basestash, "ISA", 3, FALSE);
253 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
254 gvp = (GV**)hv_fetch(stash, "ISA", 3, TRUE);
255 if (!gvp || !(gv = *gvp))
256 Perl_croak(aTHX_ "Cannot create %s::ISA", HvNAME(stash));
257 if (SvTYPE(gv) != SVt_PVGV)
258 gv_init(gv, stash, "ISA", 3, TRUE);
259 SvREFCNT_dec(GvAV(gv));
260 GvAV(gv) = (AV*)SvREFCNT_inc(av);
266 SV** svp = AvARRAY(av);
267 /* NOTE: No support for tied ISA */
268 I32 items = AvFILLp(av) + 1;
271 HV* basestash = gv_stashsv(sv, FALSE);
273 if (ckWARN(WARN_MISC))
274 Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
278 gv = gv_fetchmeth(basestash, name, len,
279 (level >= 0) ? level + 1 : level - 1);
285 /* if at top level, try UNIVERSAL */
287 if (level == 0 || level == -1) {
290 if ((lastchance = gv_stashpvn("UNIVERSAL", 9, FALSE))) {
291 if ((gv = gv_fetchmeth(lastchance, name, len,
292 (level >= 0) ? level + 1 : level - 1)))
296 * Cache method in topgv if:
297 * 1. topgv has no synonyms (else inheritance crosses wires)
298 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
301 GvREFCNT(topgv) == 1 &&
303 (CvROOT(cv) || CvXSUB(cv)))
305 if ((cv = GvCV(topgv)))
307 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
308 GvCVGEN(topgv) = PL_sub_generation;
312 else if (topgv && GvREFCNT(topgv) == 1) {
313 /* cache the fact that the method is not defined */
314 GvCVGEN(topgv) = PL_sub_generation;
323 =for apidoc gv_fetchmeth_autoload
325 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
326 Returns a glob for the subroutine.
328 For an autoloaded subroutine without a GV, will create a GV even
329 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
330 of the result may be zero.
336 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
338 GV *gv = gv_fetchmeth(stash, name, len, level);
341 const char autoload[] = "AUTOLOAD";
342 STRLEN autolen = sizeof(autoload)-1;
347 return Nullgv; /* UNIVERSAL::AUTOLOAD could cause trouble */
348 if (len == autolen && strnEQ(name, autoload, autolen))
350 if (!(gv = gv_fetchmeth(stash, autoload, autolen, FALSE)))
353 if (!(CvROOT(cv) || CvXSUB(cv)))
355 /* Have an autoload */
356 if (level < 0) /* Cannot do without a stub */
357 gv_fetchmeth(stash, name, len, 0);
358 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
367 =for apidoc gv_fetchmethod
369 See L<gv_fetchmethod_autoload>.
375 Perl_gv_fetchmethod(pTHX_ HV *stash, const char *name)
377 return gv_fetchmethod_autoload(stash, name, TRUE);
381 =for apidoc gv_fetchmethod_autoload
383 Returns the glob which contains the subroutine to call to invoke the method
384 on the C<stash>. In fact in the presence of autoloading this may be the
385 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
388 The third parameter of C<gv_fetchmethod_autoload> determines whether
389 AUTOLOAD lookup is performed if the given method is not present: non-zero
390 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
391 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
392 with a non-zero C<autoload> parameter.
394 These functions grant C<"SUPER"> token as a prefix of the method name. Note
395 that if you want to keep the returned glob for a long time, you need to
396 check for it being "AUTOLOAD", since at the later time the call may load a
397 different subroutine due to $AUTOLOAD changing its value. Use the glob
398 created via a side effect to do this.
400 These functions have the same side-effects and as C<gv_fetchmeth> with
401 C<level==0>. C<name> should be writable if contains C<':'> or C<'
402 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
403 C<call_sv> apply equally to these functions.
409 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
411 register const char *nend;
412 const char *nsplit = 0;
416 if (stash && SvTYPE(stash) < SVt_PVHV)
419 for (nend = name; *nend; nend++) {
422 else if (*nend == ':' && *(nend + 1) == ':')
426 const char *origname = name;
430 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
431 /* ->SUPER::method should really be looked up in original stash */
432 SV *tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
433 CopSTASHPV(PL_curcop)));
434 /* __PACKAGE__::SUPER stash should be autovivified */
435 stash = gv_stashpvn(SvPVX(tmpstr), SvCUR(tmpstr), TRUE);
436 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
437 origname, HvNAME(stash), name) );
440 /* don't autovifify if ->NoSuchStash::method */
441 stash = gv_stashpvn(origname, nsplit - origname, FALSE);
443 /* however, explicit calls to Pkg::SUPER::method may
444 happen, and may require autovivification to work */
445 if (!stash && (nsplit - origname) >= 7 &&
446 strnEQ(nsplit - 7, "::SUPER", 7) &&
447 gv_stashpvn(origname, nsplit - origname - 7, FALSE))
448 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
453 gv = gv_fetchmeth(stash, name, nend - name, 0);
455 if (strEQ(name,"import") || strEQ(name,"unimport"))
456 gv = (GV*)&PL_sv_yes;
458 gv = gv_autoload4(ostash, name, nend - name, TRUE);
462 if (!CvROOT(cv) && !CvXSUB(cv)) {
470 if (GvCV(stubgv) != cv) /* orphaned import */
473 autogv = gv_autoload4(GvSTASH(stubgv),
474 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
484 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
487 const char autoload[] = "AUTOLOAD";
488 const STRLEN autolen = sizeof(autoload)-1;
494 const char *packname = "";
496 if (len == autolen && strnEQ(name, autoload, autolen))
499 if (SvTYPE(stash) < SVt_PVHV) {
500 packname = SvPV_nolen((SV*)stash);
504 packname = HvNAME(stash);
507 if (!(gv = gv_fetchmeth(stash, autoload, autolen, FALSE)))
511 if (!(CvROOT(cv) || CvXSUB(cv)))
515 * Inheriting AUTOLOAD for non-methods works ... for now.
517 if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX) && !method &&
518 (GvCVGEN(gv) || GvSTASH(gv) != stash))
519 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
520 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
521 packname, (int)len, name);
524 /* rather than lookup/init $AUTOLOAD here
525 * only to have the XSUB do another lookup for $AUTOLOAD
526 * and split that value on the last '::',
527 * pass along the same data via some unused fields in the CV
530 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
536 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
537 * The subroutine's original name may not be "AUTOLOAD", so we don't
538 * use that, but for lack of anything better we will use the sub's
539 * original package to look up $AUTOLOAD.
541 varstash = GvSTASH(CvGV(cv));
542 vargv = *(GV**)hv_fetch(varstash, autoload, autolen, TRUE);
546 gv_init(vargv, varstash, autoload, autolen, FALSE);
549 sv_setpv(varsv, packname);
550 sv_catpvn(varsv, "::", 2);
551 sv_catpvn(varsv, name, len);
552 SvTAINTED_off(varsv);
556 /* The "gv" parameter should be the glob known to Perl code as *!
557 * The scalar must already have been magicalized.
560 S_require_errno(pTHX_ GV *gv)
563 HV* stash = gv_stashpvn("Errno",5,FALSE);
565 if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
569 save_scalar(gv); /* keep the value of $! */
570 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
571 newSVpvn("Errno",5), Nullsv);
574 stash = gv_stashpvn("Errno",5,FALSE);
575 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
576 Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available");
581 =for apidoc gv_stashpv
583 Returns a pointer to the stash for a specified package. C<name> should
584 be a valid UTF-8 string and must be null-terminated. If C<create> is set
585 then the package will be created if it does not already exist. If C<create>
586 is not set and the package does not exist then NULL is returned.
592 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
594 return gv_stashpvn(name, strlen(name), create);
598 =for apidoc gv_stashpvn
600 Returns a pointer to the stash for a specified package. C<name> should
601 be a valid UTF-8 string. The C<namelen> parameter indicates the length of
602 the C<name>, in bytes. If C<create> is set then the package will be
603 created if it does not already exist. If C<create> is not set and the
604 package does not exist then NULL is returned.
610 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
617 if (namelen + 3 < sizeof smallbuf)
620 New(606, tmpbuf, namelen + 3, char);
621 Copy(name,tmpbuf,namelen,char);
622 tmpbuf[namelen++] = ':';
623 tmpbuf[namelen++] = ':';
624 tmpbuf[namelen] = '\0';
625 tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV);
626 if (tmpbuf != smallbuf)
631 GvHV(tmpgv) = newHV();
634 HvNAME(stash) = savepv(name);
639 =for apidoc gv_stashsv
641 Returns a pointer to the stash for a specified package, which must be a
642 valid UTF-8 string. See C<gv_stashpv>.
648 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
651 const char *ptr = SvPV(sv,len);
652 return gv_stashpvn(ptr, len, create);
657 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
658 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
662 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
664 const char *nambeg = SvPV(name, len);
665 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
669 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
672 register const char *name = nambeg;
676 register const char *namend;
678 const I32 add = flags & ~SVf_UTF8;
681 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
684 for (namend = name; *namend; namend++) {
685 if ((*namend == ':' && namend[1] == ':')
686 || (*namend == '\'' && namend[1]))
690 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
698 if (len + 3 < sizeof (smallbuf))
701 New(601, tmpbuf, len+3, char);
702 Copy(name, tmpbuf, len, char);
706 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
707 gv = gvp ? *gvp : Nullgv;
708 if (gv && gv != (GV*)&PL_sv_undef) {
709 if (SvTYPE(gv) != SVt_PVGV)
710 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
714 if (tmpbuf != smallbuf)
716 if (!gv || gv == (GV*)&PL_sv_undef)
719 if (!(stash = GvHV(gv)))
720 stash = GvHV(gv) = newHV();
723 HvNAME(stash) = savepvn(nambeg, namend - nambeg);
731 return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE);
736 /* No stash in name, so see how we can default */
739 if (isIDFIRST_lazy(name)) {
742 /* name is always \0 terminated, and initial \0 wouldn't return
743 true from isIDFIRST_lazy, so we know that name[1] is defined */
750 if (strEQ(name, "INC") || strEQ(name, "ENV"))
754 if (strEQ(name, "SIG"))
758 if (strEQ(name, "STDIN") || strEQ(name, "STDOUT") ||
759 strEQ(name, "STDERR"))
763 if (strEQ(name, "ARGV") || strEQ(name, "ARGVOUT"))
770 else if (IN_PERL_COMPILETIME) {
772 if (add && (PL_hints & HINT_STRICT_VARS) &&
773 sv_type != SVt_PVCV &&
774 sv_type != SVt_PVGV &&
775 sv_type != SVt_PVFM &&
776 sv_type != SVt_PVIO &&
777 !(len == 1 && sv_type == SVt_PV &&
778 (*name == 'a' || *name == 'b')) )
780 gvp = (GV**)hv_fetch(stash,name,len,0);
782 *gvp == (GV*)&PL_sv_undef ||
783 SvTYPE(*gvp) != SVt_PVGV)
787 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
788 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
789 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
791 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
792 sv_type == SVt_PVAV ? '@' :
793 sv_type == SVt_PVHV ? '%' : '$',
796 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
802 stash = CopSTASH(PL_curcop);
808 /* By this point we should have a stash and a name */
812 register SV *err = Perl_mess(aTHX_
813 "Global symbol \"%s%s\" requires explicit package name",
814 (sv_type == SVt_PV ? "$"
815 : sv_type == SVt_PVAV ? "@"
816 : sv_type == SVt_PVHV ? "%"
818 if (USE_UTF8_IN_NAMES)
821 stash = GvHV(gv_fetchpv("<none>::", GV_ADDMULTI, SVt_PVHV));
827 if (!SvREFCNT(stash)) /* symbol table under destruction */
830 gvp = (GV**)hv_fetch(stash,name,len,add);
831 if (!gvp || *gvp == (GV*)&PL_sv_undef)
834 if (SvTYPE(gv) == SVt_PVGV) {
837 gv_init_sv(gv, sv_type);
838 if (*name=='!' && sv_type == SVt_PVHV && len==1)
842 } else if (add & GV_NOINIT) {
846 /* Adding a new symbol */
848 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
849 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
850 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
851 gv_init_sv(gv, sv_type);
853 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
854 : (PL_dowarn & G_WARN_ON ) ) )
857 /* set up magic where warranted */
861 /* Nothing else to do.
862 The compiler will probably turn the switch statement into a
863 branch table. Make sure we avoid even that small overhead for
864 the common case of lower case variable names. */
868 const char *name2 = name + 1;
871 if (strEQ(name2, "RGV")) {
872 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
876 if (strnEQ(name2, "XPORT", 5))
880 if (strEQ(name2, "SA")) {
883 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, Nullch, 0);
884 /* NOTE: No support for tied ISA */
885 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
886 && AvFILLp(av) == -1)
889 av_push(av, newSVpvn(pname = "NDBM_File",9));
890 gv_stashpvn(pname, 9, TRUE);
891 av_push(av, newSVpvn(pname = "DB_File",7));
892 gv_stashpvn(pname, 7, TRUE);
893 av_push(av, newSVpvn(pname = "GDBM_File",9));
894 gv_stashpvn(pname, 9, TRUE);
895 av_push(av, newSVpvn(pname = "SDBM_File",9));
896 gv_stashpvn(pname, 9, TRUE);
897 av_push(av, newSVpvn(pname = "ODBM_File",9));
898 gv_stashpvn(pname, 9, TRUE);
903 if (strEQ(name2, "VERLOAD")) {
906 hv_magic(hv, Nullgv, PERL_MAGIC_overload);
910 if (strEQ(name2, "IG")) {
914 Newz(73, PL_psig_ptr, SIG_SIZE, SV*);
915 Newz(73, PL_psig_name, SIG_SIZE, SV*);
916 Newz(73, PL_psig_pend, SIG_SIZE, int);
920 hv_magic(hv, Nullgv, PERL_MAGIC_sig);
921 for (i = 1; i < SIG_SIZE; i++) {
923 init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
925 sv_setsv(*init, &PL_sv_undef);
933 if (strEQ(name2, "ERSION"))
936 case '\005': /* $^ENCODING */
937 if (strEQ(name2, "NCODING"))
940 case '\017': /* $^OPEN */
941 if (strEQ(name2, "PEN"))
944 case '\024': /* ${^TAINT} */
945 if (strEQ(name2, "AINT"))
948 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
949 if (strEQ(name2, "NICODE"))
951 if (strEQ(name2, "TF8LOCALE"))
954 case '\027': /* $^WARNING_BITS */
955 if (strEQ(name2, "ARNING_BITS"))
968 /* ensures variable is only digits */
969 /* ${"1foo"} fails this test (and is thus writeable) */
970 /* added by japhy, but borrowed from is_gv_magical */
971 const char *end = name + len;
972 while (--end > name) {
973 if (!isDIGIT(*end)) return gv;
980 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
981 be case '\0' in this switch statement (ie a default case) */
987 sv_type == SVt_PVAV ||
988 sv_type == SVt_PVHV ||
989 sv_type == SVt_PVCV ||
990 sv_type == SVt_PVFM ||
993 PL_sawampersand = TRUE;
997 sv_setpv(GvSV(gv),PL_chopset);
1001 #ifdef COMPLEX_STATUS
1002 (void)SvUPGRADE(GvSV(gv), SVt_PVLV);
1008 /* If %! has been used, automatically load Errno.pm.
1009 The require will itself set errno, so in order to
1010 preserve its value we have to set up the magic
1011 now (rather than going to magicalize)
1014 sv_magic(GvSV(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1016 if (sv_type == SVt_PVHV)
1023 sv_magic((SV*)av, Nullsv, PERL_MAGIC_regdata, Nullch, 0);
1028 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1029 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1030 "$* is no longer supported");
1033 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1034 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1035 "Use of $# is deprecated");
1038 sv_setiv(GvSV(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1044 sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, Nullch, 0);
1048 case '\023': /* $^S */
1059 SvREADONLY_on(GvSV(gv));
1074 case '\001': /* $^A */
1075 case '\003': /* $^C */
1076 case '\004': /* $^D */
1077 case '\005': /* $^E */
1078 case '\006': /* $^F */
1079 case '\010': /* $^H */
1080 case '\011': /* $^I, NOT \t in EBCDIC */
1081 case '\016': /* $^N */
1082 case '\017': /* $^O */
1083 case '\020': /* $^P */
1084 case '\024': /* $^T */
1085 case '\027': /* $^W */
1087 sv_magic(GvSV(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1090 case '\014': /* $^L */
1091 sv_setpv(GvSV(gv),"\f");
1092 PL_formfeed = GvSV(gv);
1095 sv_setpv(GvSV(gv),"\034");
1100 if (!sv_derived_from(PL_patchlevel, "version"))
1101 (void *)upg_version(PL_patchlevel);
1102 GvSV(gv) = vnumify(PL_patchlevel);
1103 SvREADONLY_on(GvSV(gv));
1107 case '\026': /* $^V */
1109 SV * const sv = GvSV(gv);
1110 GvSV(gv) = new_version(PL_patchlevel);
1111 SvREADONLY_on(GvSV(gv));
1121 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1124 const HV * const hv = GvSTASH(gv);
1129 sv_setpv(sv, prefix ? prefix : "");
1135 if (keepmain || strNE(name, "main")) {
1137 sv_catpvn(sv,"::", 2);
1139 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1143 Perl_gv_fullname3(pTHX_ SV *sv, const GV *gv, const char *prefix)
1145 gv_fullname4(sv, gv, prefix, TRUE);
1149 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1151 const GV *egv = GvEGV(gv);
1154 gv_fullname4(sv, egv, prefix, keepmain);
1158 Perl_gv_efullname3(pTHX_ SV *sv, const GV *gv, const char *prefix)
1160 gv_efullname4(sv, gv, prefix, TRUE);
1163 /* compatibility with versions <= 5.003. */
1165 Perl_gv_fullname(pTHX_ SV *sv, const GV *gv)
1167 gv_fullname3(sv, gv, sv == (const SV*)gv ? "*" : "");
1170 /* compatibility with versions <= 5.003. */
1172 Perl_gv_efullname(pTHX_ SV *sv, const GV *gv)
1174 gv_efullname3(sv, gv, sv == (const SV*)gv ? "*" : "");
1181 IO * const io = (IO*)NEWSV(0,0);
1183 sv_upgrade((SV *)io,SVt_PVIO);
1186 /* Clear the stashcache because a new IO could overrule a
1188 hv_clear(PL_stashcache);
1189 iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV);
1190 /* unless exists($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_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1198 Perl_gv_check(pTHX_ HV *stash)
1202 if (!HvARRAY(stash))
1204 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1206 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)
1465 if (!stash || !HvNAME(stash))
1467 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1471 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1473 amtp = (AMT*)mg->mg_ptr;
1474 if ( amtp->was_ok_am != PL_amagic_generation
1475 || amtp->was_ok_sub != PL_sub_generation )
1477 if (AMT_AMAGIC(amtp)) {
1478 CV * const ret = amtp->table[id];
1479 if (ret && isGV(ret)) { /* Autoloading stab */
1480 /* Passing it through may have resulted in a warning
1481 "Inherited AUTOLOAD for a non-method deprecated", since
1482 our caller is going through a function call, not a method call.
1483 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1484 GV *gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1497 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_set(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 const 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;
1830 } else if (method==copy_amg) {
1832 Perl_croak(aTHX_ "Copy method did not return a reference");
1834 return SvREFCNT_inc(SvRV(res));
1842 =for apidoc is_gv_magical_sv
1844 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
1850 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
1853 const char *temp = SvPV(name, len);
1854 return is_gv_magical(temp, len, flags);
1858 =for apidoc is_gv_magical
1860 Returns C<TRUE> if given the name of a magical GV.
1862 Currently only useful internally when determining if a GV should be
1863 created even in rvalue contexts.
1865 C<flags> is not used at present but available for future extension to
1866 allow selecting particular classes of magical variable.
1868 Currently assumes that C<name> is NUL terminated (as well as len being valid).
1869 This assumption is met by all callers within the perl core, which all pass
1870 pointers returned by SvPV.
1875 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
1879 const char *name1 = name + 1;
1882 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
1886 if (len == 8 && strEQ(name1, "VERLOAD"))
1890 if (len == 3 && name[1] == 'I' && name[2] == 'G')
1893 /* Using ${^...} variables is likely to be sufficiently rare that
1894 it seems sensible to avoid the space hit of also checking the
1896 case '\017': /* ${^OPEN} */
1897 if (strEQ(name1, "PEN"))
1900 case '\024': /* ${^TAINT} */
1901 if (strEQ(name1, "AINT"))
1904 case '\025': /* ${^UNICODE} */
1905 if (strEQ(name1, "NICODE"))
1907 if (strEQ(name1, "TF8LOCALE"))
1910 case '\027': /* ${^WARNING_BITS} */
1911 if (strEQ(name1, "ARNING_BITS"))
1924 const char *end = name + len;
1925 while (--end > name) {
1933 /* Because we're already assuming that name is NUL terminated
1934 below, we can treat an empty name as "\0" */
1961 case '\001': /* $^A */
1962 case '\003': /* $^C */
1963 case '\004': /* $^D */
1964 case '\005': /* $^E */
1965 case '\006': /* $^F */
1966 case '\010': /* $^H */
1967 case '\011': /* $^I, NOT \t in EBCDIC */
1968 case '\014': /* $^L */
1969 case '\016': /* $^N */
1970 case '\017': /* $^O */
1971 case '\020': /* $^P */
1972 case '\023': /* $^S */
1973 case '\024': /* $^T */
1974 case '\026': /* $^V */
1975 case '\027': /* $^W */