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 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 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 char autoload[] = "AUTOLOAD";
488 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)
653 return gv_stashpvn(ptr, len, create);
658 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
659 STRLEN len = strlen (nambeg);
660 return gv_fetchpvn_flags(nambeg, len, add, sv_type);
664 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
666 const char *nambeg = SvPV(name, len);
667 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
671 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
674 register const char *name = nambeg;
678 register const char *namend;
680 const I32 add = flags & ~SVf_UTF8;
683 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
686 for (namend = name; *namend; namend++) {
687 if ((*namend == ':' && namend[1] == ':')
688 || (*namend == '\'' && namend[1]))
692 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
700 if (len + 3 < sizeof (smallbuf))
703 New(601, tmpbuf, len+3, char);
704 Copy(name, tmpbuf, len, char);
708 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
709 gv = gvp ? *gvp : Nullgv;
710 if (gv && gv != (GV*)&PL_sv_undef) {
711 if (SvTYPE(gv) != SVt_PVGV)
712 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
716 if (tmpbuf != smallbuf)
718 if (!gv || gv == (GV*)&PL_sv_undef)
721 if (!(stash = GvHV(gv)))
722 stash = GvHV(gv) = newHV();
725 HvNAME(stash) = savepvn(nambeg, namend - nambeg);
733 return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE);
738 /* No stash in name, so see how we can default */
741 if (isIDFIRST_lazy(name)) {
744 /* name is always \0 terminated, and initial \0 wouldn't return
745 true from isIDFIRST_lazy, so we know that name[1] is defined */
752 if (strEQ(name, "INC") || strEQ(name, "ENV"))
756 if (strEQ(name, "SIG"))
760 if (strEQ(name, "STDIN") || strEQ(name, "STDOUT") ||
761 strEQ(name, "STDERR"))
765 if (strEQ(name, "ARGV") || strEQ(name, "ARGVOUT"))
772 else if (IN_PERL_COMPILETIME) {
774 if (add && (PL_hints & HINT_STRICT_VARS) &&
775 sv_type != SVt_PVCV &&
776 sv_type != SVt_PVGV &&
777 sv_type != SVt_PVFM &&
778 sv_type != SVt_PVIO &&
779 !(len == 1 && sv_type == SVt_PV &&
780 (*name == 'a' || *name == 'b')) )
782 gvp = (GV**)hv_fetch(stash,name,len,0);
784 *gvp == (GV*)&PL_sv_undef ||
785 SvTYPE(*gvp) != SVt_PVGV)
789 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
790 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
791 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
793 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
794 sv_type == SVt_PVAV ? '@' :
795 sv_type == SVt_PVHV ? '%' : '$',
798 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
804 stash = CopSTASH(PL_curcop);
810 /* By this point we should have a stash and a name */
814 register SV *err = Perl_mess(aTHX_
815 "Global symbol \"%s%s\" requires explicit package name",
816 (sv_type == SVt_PV ? "$"
817 : sv_type == SVt_PVAV ? "@"
818 : sv_type == SVt_PVHV ? "%"
820 if (USE_UTF8_IN_NAMES)
823 stash = GvHV(gv_fetchpv("<none>::", GV_ADDMULTI, SVt_PVHV));
829 if (!SvREFCNT(stash)) /* symbol table under destruction */
832 gvp = (GV**)hv_fetch(stash,name,len,add);
833 if (!gvp || *gvp == (GV*)&PL_sv_undef)
836 if (SvTYPE(gv) == SVt_PVGV) {
839 gv_init_sv(gv, sv_type);
840 if (*name=='!' && sv_type == SVt_PVHV && len==1)
844 } else if (add & GV_NOINIT) {
848 /* Adding a new symbol */
850 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
851 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
852 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
853 gv_init_sv(gv, sv_type);
855 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
856 : (PL_dowarn & G_WARN_ON ) ) )
859 /* set up magic where warranted */
863 /* Nothing else to do.
864 The compiler will probably turn the switch statement into a
865 branch table. Make sure we avoid even that small overhead for
866 the common case of lower case variable names. */
870 const char *name2 = name + 1;
873 if (strEQ(name2, "RGV")) {
874 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
878 if (strnEQ(name2, "XPORT", 5))
882 if (strEQ(name2, "SA")) {
885 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, Nullch, 0);
886 /* NOTE: No support for tied ISA */
887 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
888 && AvFILLp(av) == -1)
891 av_push(av, newSVpvn(pname = "NDBM_File",9));
892 gv_stashpvn(pname, 9, TRUE);
893 av_push(av, newSVpvn(pname = "DB_File",7));
894 gv_stashpvn(pname, 7, TRUE);
895 av_push(av, newSVpvn(pname = "GDBM_File",9));
896 gv_stashpvn(pname, 9, TRUE);
897 av_push(av, newSVpvn(pname = "SDBM_File",9));
898 gv_stashpvn(pname, 9, TRUE);
899 av_push(av, newSVpvn(pname = "ODBM_File",9));
900 gv_stashpvn(pname, 9, TRUE);
905 if (strEQ(name2, "VERLOAD")) {
908 hv_magic(hv, Nullgv, PERL_MAGIC_overload);
912 if (strEQ(name2, "IG")) {
916 Newz(73, PL_psig_ptr, SIG_SIZE, SV*);
917 Newz(73, PL_psig_name, SIG_SIZE, SV*);
918 Newz(73, PL_psig_pend, SIG_SIZE, int);
922 hv_magic(hv, Nullgv, PERL_MAGIC_sig);
923 for (i = 1; i < SIG_SIZE; i++) {
925 init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
927 sv_setsv(*init, &PL_sv_undef);
935 if (strEQ(name2, "ERSION"))
938 case '\005': /* $^ENCODING */
939 if (strEQ(name2, "NCODING"))
942 case '\017': /* $^OPEN */
943 if (strEQ(name2, "PEN"))
946 case '\024': /* ${^TAINT} */
947 if (strEQ(name2, "AINT"))
950 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
951 if (strEQ(name2, "NICODE"))
953 if (strEQ(name2, "TF8LOCALE"))
956 case '\027': /* $^WARNING_BITS */
957 if (strEQ(name2, "ARNING_BITS"))
970 /* ensures variable is only digits */
971 /* ${"1foo"} fails this test (and is thus writeable) */
972 /* added by japhy, but borrowed from is_gv_magical */
973 const char *end = name + len;
974 while (--end > name) {
975 if (!isDIGIT(*end)) return gv;
982 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
983 be case '\0' in this switch statement (ie a default case) */
989 sv_type == SVt_PVAV ||
990 sv_type == SVt_PVHV ||
991 sv_type == SVt_PVCV ||
992 sv_type == SVt_PVFM ||
995 PL_sawampersand = TRUE;
999 sv_setpv(GvSV(gv),PL_chopset);
1003 #ifdef COMPLEX_STATUS
1004 (void)SvUPGRADE(GvSV(gv), SVt_PVLV);
1010 /* If %! has been used, automatically load Errno.pm.
1011 The require will itself set errno, so in order to
1012 preserve its value we have to set up the magic
1013 now (rather than going to magicalize)
1016 sv_magic(GvSV(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1018 if (sv_type == SVt_PVHV)
1025 sv_magic((SV*)av, Nullsv, PERL_MAGIC_regdata, Nullch, 0);
1030 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1031 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1032 "$* is no longer supported");
1035 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1036 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1037 "Use of $# is deprecated");
1040 sv_setiv(GvSV(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1046 sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, Nullch, 0);
1050 case '\023': /* $^S */
1061 SvREADONLY_on(GvSV(gv));
1076 case '\001': /* $^A */
1077 case '\003': /* $^C */
1078 case '\004': /* $^D */
1079 case '\005': /* $^E */
1080 case '\006': /* $^F */
1081 case '\010': /* $^H */
1082 case '\011': /* $^I, NOT \t in EBCDIC */
1083 case '\016': /* $^N */
1084 case '\017': /* $^O */
1085 case '\020': /* $^P */
1086 case '\024': /* $^T */
1087 case '\027': /* $^W */
1089 sv_magic(GvSV(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1092 case '\014': /* $^L */
1093 sv_setpv(GvSV(gv),"\f");
1094 PL_formfeed = GvSV(gv);
1097 sv_setpv(GvSV(gv),"\034");
1102 if (!sv_derived_from(PL_patchlevel, "version"))
1103 (void *)upg_version(PL_patchlevel);
1104 GvSV(gv) = vnumify(PL_patchlevel);
1105 SvREADONLY_on(GvSV(gv));
1109 case '\026': /* $^V */
1111 SV * const sv = GvSV(gv);
1112 GvSV(gv) = new_version(PL_patchlevel);
1113 SvREADONLY_on(GvSV(gv));
1123 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1126 const HV * const hv = GvSTASH(gv);
1131 sv_setpv(sv, prefix ? prefix : "");
1137 if (keepmain || strNE(name, "main")) {
1139 sv_catpvn(sv,"::", 2);
1141 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1145 Perl_gv_fullname3(pTHX_ SV *sv, const GV *gv, const char *prefix)
1147 gv_fullname4(sv, gv, prefix, TRUE);
1151 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1153 const GV *egv = GvEGV(gv);
1156 gv_fullname4(sv, egv, prefix, keepmain);
1160 Perl_gv_efullname3(pTHX_ SV *sv, const GV *gv, const char *prefix)
1162 gv_efullname4(sv, gv, prefix, TRUE);
1165 /* compatibility with versions <= 5.003. */
1167 Perl_gv_fullname(pTHX_ SV *sv, const GV *gv)
1169 gv_fullname3(sv, gv, sv == (const SV*)gv ? "*" : "");
1172 /* compatibility with versions <= 5.003. */
1174 Perl_gv_efullname(pTHX_ SV *sv, const GV *gv)
1176 gv_efullname3(sv, gv, sv == (const SV*)gv ? "*" : "");
1185 io = (IO*)NEWSV(0,0);
1186 sv_upgrade((SV *)io,SVt_PVIO);
1189 /* Clear the stashcache because a new IO could overrule a
1191 hv_clear(PL_stashcache);
1192 iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV);
1193 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1194 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1195 iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV);
1196 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1201 Perl_gv_check(pTHX_ HV *stash)
1207 if (!HvARRAY(stash))
1209 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1211 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1212 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1213 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1215 if (hv != PL_defstash && hv != stash)
1216 gv_check(hv); /* nested package */
1218 else if (isALPHA(*HeKEY(entry))) {
1220 gv = (GV*)HeVAL(entry);
1221 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1224 /* performance hack: if filename is absolute and it's a standard
1225 * module, don't bother warning */
1227 && PERL_FILE_IS_ABSOLUTE(file)
1228 #ifdef MACOS_TRADITIONAL
1229 && (instr(file, ":lib:")
1231 && (instr(file, "/lib/")
1233 || instr(file, ".pm")))
1237 CopLINE_set(PL_curcop, GvLINE(gv));
1239 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1241 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1243 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1244 "Name \"%s::%s\" used only once: possible typo",
1245 HvNAME(stash), GvNAME(gv));
1252 Perl_newGVgen(pTHX_ const char *pack)
1254 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1258 /* hopefully this is only called on local symbol table entries */
1261 Perl_gp_ref(pTHX_ GP *gp)
1268 /* multi-named GPs cannot be used for method cache */
1269 SvREFCNT_dec(gp->gp_cv);
1274 /* Adding a new name to a subroutine invalidates method cache */
1275 PL_sub_generation++;
1282 Perl_gp_free(pTHX_ GV *gv)
1286 if (!gv || !(gp = GvGP(gv)))
1288 if (gp->gp_refcnt == 0) {
1289 if (ckWARN_d(WARN_INTERNAL))
1290 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1291 "Attempt to free unreferenced glob pointers"
1292 pTHX__FORMAT pTHX__VALUE);
1296 /* Deleting the name of a subroutine invalidates method cache */
1297 PL_sub_generation++;
1299 if (--gp->gp_refcnt > 0) {
1300 if (gp->gp_egv == gv)
1305 if (gp->gp_sv) SvREFCNT_dec(gp->gp_sv);
1306 if (gp->gp_av) SvREFCNT_dec(gp->gp_av);
1308 if (PL_stashcache && HvNAME(gp->gp_hv))
1309 hv_delete(PL_stashcache,
1310 HvNAME(gp->gp_hv), strlen(HvNAME(gp->gp_hv)),
1312 SvREFCNT_dec(gp->gp_hv);
1314 if (gp->gp_io) SvREFCNT_dec(gp->gp_io);
1315 if (gp->gp_cv) SvREFCNT_dec(gp->gp_cv);
1316 if (gp->gp_form) SvREFCNT_dec(gp->gp_form);
1323 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1325 AMT *amtp = (AMT*)mg->mg_ptr;
1328 if (amtp && AMT_AMAGIC(amtp)) {
1330 for (i = 1; i < NofAMmeth; i++) {
1331 CV *cv = amtp->table[i];
1333 SvREFCNT_dec((SV *) cv);
1334 amtp->table[i] = Nullcv;
1341 /* Updates and caches the CV's */
1344 Perl_Gv_AMupdate(pTHX_ HV *stash)
1348 MAGIC* mg=mg_find((SV*)stash, PERL_MAGIC_overload_table);
1349 AMT *amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
1352 if (mg && amtp->was_ok_am == PL_amagic_generation
1353 && amtp->was_ok_sub == PL_sub_generation)
1354 return (bool)AMT_OVERLOADED(amtp);
1355 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1357 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME(stash)) );
1360 amt.was_ok_am = PL_amagic_generation;
1361 amt.was_ok_sub = PL_sub_generation;
1362 amt.fallback = AMGfallNO;
1366 int filled = 0, have_ovl = 0;
1370 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1372 /* Try to find via inheritance. */
1373 gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1378 lim = DESTROY_amg; /* Skip overloading entries. */
1379 else if (SvTRUE(sv))
1380 amt.fallback=AMGfallYES;
1382 amt.fallback=AMGfallNEVER;
1384 for (i = 1; i < lim; i++)
1385 amt.table[i] = Nullcv;
1386 for (; i < NofAMmeth; i++) {
1387 const char *cooky = PL_AMG_names[i];
1388 /* Human-readable form, for debugging: */
1389 const char *cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1390 const STRLEN l = strlen(cooky);
1392 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of `%s' in package `%.256s'\n",
1393 cp, HvNAME(stash)) );
1394 /* don't fill the cache while looking up!
1395 Creation of inheritance stubs in intermediate packages may
1396 conflict with the logic of runtime method substitution.
1397 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1398 then we could have created stubs for "(+0" in A and C too.
1399 But if B overloads "bool", we may want to use it for
1400 numifying instead of C's "+0". */
1401 if (i >= DESTROY_amg)
1402 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1403 else /* Autoload taken care of below */
1404 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1406 if (gv && (cv = GvCV(gv))) {
1407 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1408 && strEQ(HvNAME(GvSTASH(CvGV(cv))), "overload")) {
1409 /* This is a hack to support autoloading..., while
1410 knowing *which* methods were declared as overloaded. */
1411 /* GvSV contains the name of the method. */
1414 DEBUG_o( Perl_deb(aTHX_ "Resolving method `%"SVf256\
1415 "' for overloaded `%s' in package `%.256s'\n",
1416 GvSV(gv), cp, HvNAME(stash)) );
1417 if (!SvPOK(GvSV(gv))
1418 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX(GvSV(gv)),
1421 /* Can be an import stub (created by `can'). */
1422 SV *gvsv = GvSV(gv);
1423 const char *name = SvPOK(gvsv) ? SvPVX(gvsv) : "???";
1424 Perl_croak(aTHX_ "%s method `%.256s' overloading `%s' "\
1425 "in package `%.256s'",
1426 (GvCVGEN(gv) ? "Stub found while resolving"
1428 name, cp, HvNAME(stash));
1430 cv = GvCV(gv = ngv);
1432 DEBUG_o( Perl_deb(aTHX_ "Overloading `%s' in package `%.256s' via `%.256s::%.256s' \n",
1433 cp, HvNAME(stash), HvNAME(GvSTASH(CvGV(cv))),
1434 GvNAME(CvGV(cv))) );
1436 if (i < DESTROY_amg)
1438 } else if (gv) { /* Autoloaded... */
1442 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1445 AMT_AMAGIC_on(&amt);
1447 AMT_OVERLOADED_on(&amt);
1448 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1449 (char*)&amt, sizeof(AMT));
1453 /* Here we have no table: */
1455 AMT_AMAGIC_off(&amt);
1456 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1457 (char*)&amt, sizeof(AMTS));
1463 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1469 if (!stash || !HvNAME(stash))
1471 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1475 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1477 amtp = (AMT*)mg->mg_ptr;
1478 if ( amtp->was_ok_am != PL_amagic_generation
1479 || amtp->was_ok_sub != PL_sub_generation )
1481 if (AMT_AMAGIC(amtp)) {
1482 ret = amtp->table[id];
1483 if (ret && isGV(ret)) { /* Autoloading stab */
1484 /* Passing it through may have resulted in a warning
1485 "Inherited AUTOLOAD for a non-method deprecated", since
1486 our caller is going through a function call, not a method call.
1487 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1488 GV *gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1501 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1506 CV **cvp=NULL, **ocvp=NULL;
1507 AMT *amtp=NULL, *oamtp=NULL;
1508 int off=0, off1, lr=0, assign=AMGf_assign & flags, notfound=0;
1509 int postpr = 0, force_cpy = 0, assignshift = assign ? 1 : 0;
1514 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1515 && (stash = SvSTASH(SvRV(left)))
1516 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1517 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1518 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1520 && ((cv = cvp[off=method+assignshift])
1521 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1527 cv = cvp[off=method])))) {
1528 lr = -1; /* Call method for left argument */
1530 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1533 /* look for substituted methods */
1534 /* In all the covered cases we should be called with assign==0. */
1538 if ((cv = cvp[off=add_ass_amg])
1539 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1540 right = &PL_sv_yes; lr = -1; assign = 1;
1545 if ((cv = cvp[off = subtr_ass_amg])
1546 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1547 right = &PL_sv_yes; lr = -1; assign = 1;
1551 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1554 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1557 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1560 (void)((cv = cvp[off=bool__amg])
1561 || (cv = cvp[off=numer_amg])
1562 || (cv = cvp[off=string_amg]));
1568 * SV* ref causes confusion with the interpreter variable of
1571 SV* tmpRef=SvRV(left);
1572 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1574 * Just to be extra cautious. Maybe in some
1575 * additional cases sv_setsv is safe, too.
1577 SV* newref = newSVsv(tmpRef);
1578 SvOBJECT_on(newref);
1579 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1585 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1586 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1587 SV* nullsv=sv_2mortal(newSViv(0));
1589 SV* lessp = amagic_call(left,nullsv,
1590 lt_amg,AMGf_noright);
1591 logic = SvTRUE(lessp);
1593 SV* lessp = amagic_call(left,nullsv,
1594 ncmp_amg,AMGf_noright);
1595 logic = (SvNV(lessp) < 0);
1598 if (off==subtr_amg) {
1609 if ((cv = cvp[off=subtr_amg])) {
1611 left = sv_2mortal(newSViv(0));
1616 case iter_amg: /* XXXX Eventually should do to_gv. */
1618 return NULL; /* Delegate operation to standard mechanisms. */
1626 return left; /* Delegate operation to standard mechanisms. */
1631 if (!cv) goto not_found;
1632 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1633 && (stash = SvSTASH(SvRV(right)))
1634 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1635 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1636 ? (amtp = (AMT*)mg->mg_ptr)->table
1638 && (cv = cvp[off=method])) { /* Method for right
1641 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1642 && (cvp=ocvp) && (lr = -1))
1643 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1644 && !(flags & AMGf_unary)) {
1645 /* We look for substitution for
1646 * comparison operations and
1648 if (method==concat_amg || method==concat_ass_amg
1649 || method==repeat_amg || method==repeat_ass_amg) {
1650 return NULL; /* Delegate operation to string conversion */
1660 postpr = 1; off=ncmp_amg; break;
1667 postpr = 1; off=scmp_amg; break;
1669 if (off != -1) cv = cvp[off];
1674 not_found: /* No method found, either report or croak */
1682 return left; /* Delegate operation to standard mechanisms. */
1685 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1686 notfound = 1; lr = -1;
1687 } else if (cvp && (cv=cvp[nomethod_amg])) {
1688 notfound = 1; lr = 1;
1691 if (off==-1) off=method;
1692 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1693 "Operation `%s': no method found,%sargument %s%s%s%s",
1694 AMG_id2name(method + assignshift),
1695 (flags & AMGf_unary ? " " : "\n\tleft "),
1697 "in overloaded package ":
1698 "has no overloaded magic",
1700 HvNAME(SvSTASH(SvRV(left))):
1703 ",\n\tright argument in overloaded package ":
1706 : ",\n\tright argument has no overloaded magic"),
1708 HvNAME(SvSTASH(SvRV(right))):
1710 if (amtp && amtp->fallback >= AMGfallYES) {
1711 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX(msg)) );
1713 Perl_croak(aTHX_ "%"SVf, msg);
1717 force_cpy = force_cpy || assign;
1722 DEBUG_o(Perl_deb(aTHX_
1723 "Overloaded operator `%s'%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1725 method+assignshift==off? "" :
1727 method+assignshift==off? "" :
1728 AMG_id2name(method+assignshift),
1729 method+assignshift==off? "" : "')",
1730 flags & AMGf_unary? "" :
1731 lr==1 ? " for right argument": " for left argument",
1732 flags & AMGf_unary? " for argument" : "",
1733 stash ? HvNAME(stash) : "null",
1734 fl? ",\n\tassignment variant used": "") );
1737 /* Since we use shallow copy during assignment, we need
1738 * to dublicate the contents, probably calling user-supplied
1739 * version of copy operator
1741 /* We need to copy in following cases:
1742 * a) Assignment form was called.
1743 * assignshift==1, assign==T, method + 1 == off
1744 * b) Increment or decrement, called directly.
1745 * assignshift==0, assign==0, method + 0 == off
1746 * c) Increment or decrement, translated to assignment add/subtr.
1747 * assignshift==0, assign==T,
1749 * d) Increment or decrement, translated to nomethod.
1750 * assignshift==0, assign==0,
1752 * e) Assignment form translated to nomethod.
1753 * assignshift==1, assign==T, method + 1 != off
1756 /* off is method, method+assignshift, or a result of opcode substitution.
1757 * In the latter case assignshift==0, so only notfound case is important.
1759 if (( (method + assignshift == off)
1760 && (assign || (method == inc_amg) || (method == dec_amg)))
1767 bool oldcatch = CATCH_GET;
1770 Zero(&myop, 1, BINOP);
1771 myop.op_last = (OP *) &myop;
1772 myop.op_next = Nullop;
1773 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1775 PUSHSTACKi(PERLSI_OVERLOAD);
1778 PL_op = (OP *) &myop;
1779 if (PERLDB_SUB && PL_curstash != PL_debstash)
1780 PL_op->op_private |= OPpENTERSUB_DB;
1784 EXTEND(SP, notfound + 5);
1785 PUSHs(lr>0? right: left);
1786 PUSHs(lr>0? left: right);
1787 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1789 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1794 if ((PL_op = Perl_pp_entersub(aTHX)))
1802 CATCH_SET(oldcatch);
1809 ans=SvIV(res)<=0; break;
1812 ans=SvIV(res)<0; break;
1815 ans=SvIV(res)>=0; break;
1818 ans=SvIV(res)>0; break;
1821 ans=SvIV(res)==0; break;
1824 ans=SvIV(res)!=0; break;
1827 SvSetSV(left,res); return left;
1829 ans=!SvTRUE(res); break;
1832 } else if (method==copy_amg) {
1834 Perl_croak(aTHX_ "Copy method did not return a reference");
1836 return SvREFCNT_inc(SvRV(res));
1844 =for apidoc is_gv_magical_sv
1846 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
1852 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
1855 const char *temp = SvPV(name, len);
1856 return is_gv_magical(temp, len, flags);
1860 =for apidoc is_gv_magical
1862 Returns C<TRUE> if given the name of a magical GV.
1864 Currently only useful internally when determining if a GV should be
1865 created even in rvalue contexts.
1867 C<flags> is not used at present but available for future extension to
1868 allow selecting particular classes of magical variable.
1870 Currently assumes that C<name> is NUL terminated (as well as len being valid).
1871 This assumption is met by all callers within the perl core, which all pass
1872 pointers returned by SvPV.
1877 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
1881 const char *name1 = name + 1;
1884 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
1888 if (len == 8 && strEQ(name1, "VERLOAD"))
1892 if (len == 3 && name[1] == 'I' && name[2] == 'G')
1895 /* Using ${^...} variables is likely to be sufficiently rare that
1896 it seems sensible to avoid the space hit of also checking the
1898 case '\017': /* ${^OPEN} */
1899 if (strEQ(name1, "PEN"))
1902 case '\024': /* ${^TAINT} */
1903 if (strEQ(name1, "AINT"))
1906 case '\025': /* ${^UNICODE} */
1907 if (strEQ(name1, "NICODE"))
1909 if (strEQ(name1, "TF8LOCALE"))
1912 case '\027': /* ${^WARNING_BITS} */
1913 if (strEQ(name1, "ARNING_BITS"))
1926 const char *end = name + len;
1927 while (--end > name) {
1935 /* Because we're already assuming that name is NUL terminated
1936 below, we can treat an empty name as "\0" */
1963 case '\001': /* $^A */
1964 case '\003': /* $^C */
1965 case '\004': /* $^D */
1966 case '\005': /* $^E */
1967 case '\006': /* $^F */
1968 case '\010': /* $^H */
1969 case '\011': /* $^I, NOT \t in EBCDIC */
1970 case '\014': /* $^L */
1971 case '\016': /* $^N */
1972 case '\017': /* $^O */
1973 case '\020': /* $^P */
1974 case '\023': /* $^S */
1975 case '\024': /* $^T */
1976 case '\026': /* $^V */
1977 case '\027': /* $^W */