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 $foo, @foo, %foo.
27 GVs are usually found as values in stashes (symbol table hashes) where
28 Perl stores its global variables.
37 static const char S_autoload[] = "AUTOLOAD";
38 static const STRLEN S_autolen = sizeof(S_autoload)-1;
41 Perl_gv_AVadd(pTHX_ register GV *gv)
43 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
44 Perl_croak(aTHX_ "Bad symbol for array");
51 Perl_gv_HVadd(pTHX_ register GV *gv)
53 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
54 Perl_croak(aTHX_ "Bad symbol for hash");
61 Perl_gv_IOadd(pTHX_ register GV *gv)
63 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
64 Perl_croak(aTHX_ "Bad symbol for filehandle");
66 #ifdef GV_UNIQUE_CHECK
68 Perl_croak(aTHX_ "Bad symbol for filehandle (GV is unique)");
77 Perl_gv_fetchfile(pTHX_ const char *name)
87 tmplen = strlen(name) + 2;
88 if (tmplen < sizeof smallbuf)
91 New(603, tmpbuf, tmplen + 1, char);
92 /* This is where the debugger's %{"::_<$filename"} hash is created */
95 strcpy(tmpbuf + 2, name);
96 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
98 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
99 sv_setpv(GvSV(gv), name);
101 hv_magic(GvHVn(gv_AVadd(gv)), Nullgv, PERL_MAGIC_dbfile);
103 if (tmpbuf != smallbuf)
109 Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
113 const bool doproto = SvTYPE(gv) > SVt_NULL;
114 const char * const proto = (doproto && SvPOK(gv)) ? SvPVX(gv) : NULL;
116 sv_upgrade((SV*)gv, SVt_PVGV);
125 Newz(602, gp, 1, GP);
126 GvGP(gv) = gp_ref(gp);
127 GvSV(gv) = NEWSV(72,0);
128 GvLINE(gv) = CopLINE(PL_curcop);
129 /* XXX Ideally this cast would be replaced with a change to const char*
131 GvFILE(gv) = CopFILE(PL_curcop) ? CopFILE(PL_curcop) : (char *) "";
134 sv_magic((SV*)gv, (SV*)gv, PERL_MAGIC_glob, Nullch, 0);
135 GvSTASH(gv) = (HV*)SvREFCNT_inc(stash);
136 GvNAME(gv) = savepvn(name, len);
138 if (multi || doproto) /* doproto means it _was_ mentioned */
140 if (doproto) { /* Replicate part of newSUB here. */
143 /* XXX unsafe for threads if eval_owner isn't held */
144 start_subparse(0,0); /* Create CV in compcv. */
145 GvCV(gv) = PL_compcv;
150 CvFILE_set_from_cop(GvCV(gv), PL_curcop);
151 CvSTASH(GvCV(gv)) = PL_curstash;
153 sv_setpv((SV*)GvCV(gv), proto);
160 S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
176 =for apidoc gv_fetchmeth
178 Returns the glob with the given C<name> and a defined subroutine or
179 C<NULL>. The glob lives in the given C<stash>, or in the stashes
180 accessible via @ISA and UNIVERSAL::.
182 The argument C<level> should be either 0 or -1. If C<level==0>, as a
183 side-effect creates a glob with the given C<name> in the given C<stash>
184 which in the case of success contains an alias for the subroutine, and sets
185 up caching info for this glob. Similarly for all the searched stashes.
187 This function grants C<"SUPER"> token as a postfix of the stash name. The
188 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
189 visible to Perl code. So when calling C<call_sv>, you should not use
190 the GV directly; instead, you should use the method's CV, which can be
191 obtained from the GV with the C<GvCV> macro.
197 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
205 /* UNIVERSAL methods should be callable without a stash */
207 level = -1; /* probably appropriate */
208 if(!(stash = gv_stashpvn("UNIVERSAL", 9, FALSE)))
214 "Can't use anonymous symbol table for method lookup");
216 if ((level > 100) || (level < -100))
217 Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
218 name, HvNAME(stash));
220 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,HvNAME(stash)) );
222 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
227 if (SvTYPE(topgv) != SVt_PVGV)
228 gv_init(topgv, stash, name, len, TRUE);
229 if ((cv = GvCV(topgv))) {
230 /* If genuine method or valid cache entry, use it */
231 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
233 /* Stale cached entry: junk it */
235 GvCV(topgv) = cv = Nullcv;
238 else if (GvCVGEN(topgv) == PL_sub_generation)
239 return 0; /* cache indicates sub doesn't exist */
242 gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE);
243 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : Nullav;
245 /* create and re-create @.*::SUPER::ISA on demand */
246 if (!av || !SvMAGIC(av)) {
247 const char* packname = HvNAME(stash);
248 STRLEN packlen = strlen(packname);
250 if (packlen >= 7 && strEQ(packname + packlen - 7, "::SUPER")) {
254 basestash = gv_stashpvn(packname, packlen, TRUE);
255 gvp = (GV**)hv_fetch(basestash, "ISA", 3, FALSE);
256 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
257 gvp = (GV**)hv_fetch(stash, "ISA", 3, TRUE);
258 if (!gvp || !(gv = *gvp))
259 Perl_croak(aTHX_ "Cannot create %s::ISA", HvNAME(stash));
260 if (SvTYPE(gv) != SVt_PVGV)
261 gv_init(gv, stash, "ISA", 3, TRUE);
262 SvREFCNT_dec(GvAV(gv));
263 GvAV(gv) = (AV*)SvREFCNT_inc(av);
269 SV** svp = AvARRAY(av);
270 /* NOTE: No support for tied ISA */
271 I32 items = AvFILLp(av) + 1;
274 HV* basestash = gv_stashsv(sv, FALSE);
276 if (ckWARN(WARN_MISC))
277 Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
281 gv = gv_fetchmeth(basestash, name, len,
282 (level >= 0) ? level + 1 : level - 1);
288 /* if at top level, try UNIVERSAL */
290 if (level == 0 || level == -1) {
293 if ((lastchance = gv_stashpvn("UNIVERSAL", 9, FALSE))) {
294 if ((gv = gv_fetchmeth(lastchance, name, len,
295 (level >= 0) ? level + 1 : level - 1)))
299 * Cache method in topgv if:
300 * 1. topgv has no synonyms (else inheritance crosses wires)
301 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
304 GvREFCNT(topgv) == 1 &&
306 (CvROOT(cv) || CvXSUB(cv)))
308 if ((cv = GvCV(topgv)))
310 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
311 GvCVGEN(topgv) = PL_sub_generation;
315 else if (topgv && GvREFCNT(topgv) == 1) {
316 /* cache the fact that the method is not defined */
317 GvCVGEN(topgv) = PL_sub_generation;
326 =for apidoc gv_fetchmeth_autoload
328 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
329 Returns a glob for the subroutine.
331 For an autoloaded subroutine without a GV, will create a GV even
332 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
333 of the result may be zero.
339 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
341 GV *gv = gv_fetchmeth(stash, name, len, level);
348 return Nullgv; /* UNIVERSAL::AUTOLOAD could cause trouble */
349 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
351 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
354 if (!(CvROOT(cv) || CvXSUB(cv)))
356 /* Have an autoload */
357 if (level < 0) /* Cannot do without a stub */
358 gv_fetchmeth(stash, name, len, 0);
359 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
368 =for apidoc gv_fetchmethod
370 See L<gv_fetchmethod_autoload>.
376 Perl_gv_fetchmethod(pTHX_ HV *stash, const char *name)
378 return gv_fetchmethod_autoload(stash, name, TRUE);
382 =for apidoc gv_fetchmethod_autoload
384 Returns the glob which contains the subroutine to call to invoke the method
385 on the C<stash>. In fact in the presence of autoloading this may be the
386 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
389 The third parameter of C<gv_fetchmethod_autoload> determines whether
390 AUTOLOAD lookup is performed if the given method is not present: non-zero
391 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
392 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
393 with a non-zero C<autoload> parameter.
395 These functions grant C<"SUPER"> token as a prefix of the method name. Note
396 that if you want to keep the returned glob for a long time, you need to
397 check for it being "AUTOLOAD", since at the later time the call may load a
398 different subroutine due to $AUTOLOAD changing its value. Use the glob
399 created via a side effect to do this.
401 These functions have the same side-effects and as C<gv_fetchmeth> with
402 C<level==0>. C<name> should be writable if contains C<':'> or C<'
403 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
404 C<call_sv> apply equally to these functions.
410 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
412 register const char *nend;
413 const char *nsplit = 0;
417 if (stash && SvTYPE(stash) < SVt_PVHV)
420 for (nend = name; *nend; nend++) {
423 else if (*nend == ':' && *(nend + 1) == ':')
427 const char *origname = name;
431 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
432 /* ->SUPER::method should really be looked up in original stash */
433 SV *tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
434 CopSTASHPV(PL_curcop)));
435 /* __PACKAGE__::SUPER stash should be autovivified */
436 stash = gv_stashpvn(SvPVX(tmpstr), SvCUR(tmpstr), TRUE);
437 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
438 origname, HvNAME(stash), name) );
441 /* don't autovifify if ->NoSuchStash::method */
442 stash = gv_stashpvn(origname, nsplit - origname, FALSE);
444 /* however, explicit calls to Pkg::SUPER::method may
445 happen, and may require autovivification to work */
446 if (!stash && (nsplit - origname) >= 7 &&
447 strnEQ(nsplit - 7, "::SUPER", 7) &&
448 gv_stashpvn(origname, nsplit - origname - 7, FALSE))
449 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
454 gv = gv_fetchmeth(stash, name, nend - name, 0);
456 if (strEQ(name,"import") || strEQ(name,"unimport"))
457 gv = (GV*)&PL_sv_yes;
459 gv = gv_autoload4(ostash, name, nend - name, TRUE);
463 if (!CvROOT(cv) && !CvXSUB(cv)) {
471 if (GvCV(stubgv) != cv) /* orphaned import */
474 autogv = gv_autoload4(GvSTASH(stubgv),
475 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
485 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
493 const char *packname = "";
495 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
498 if (SvTYPE(stash) < SVt_PVHV) {
499 packname = SvPV_nolen((SV*)stash);
503 packname = HvNAME(stash);
506 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
510 if (!(CvROOT(cv) || CvXSUB(cv)))
514 * Inheriting AUTOLOAD for non-methods works ... for now.
516 if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX) && !method &&
517 (GvCVGEN(gv) || GvSTASH(gv) != stash))
518 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
519 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
520 packname, (int)len, name);
523 /* rather than lookup/init $AUTOLOAD here
524 * only to have the XSUB do another lookup for $AUTOLOAD
525 * and split that value on the last '::',
526 * pass along the same data via some unused fields in the CV
529 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
535 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
536 * The subroutine's original name may not be "AUTOLOAD", so we don't
537 * use that, but for lack of anything better we will use the sub's
538 * original package to look up $AUTOLOAD.
540 varstash = GvSTASH(CvGV(cv));
541 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
545 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
548 sv_setpv(varsv, packname);
549 sv_catpvn(varsv, "::", 2);
550 sv_catpvn(varsv, name, len);
551 SvTAINTED_off(varsv);
555 /* The "gv" parameter should be the glob known to Perl code as *!
556 * The scalar must already have been magicalized.
559 S_require_errno(pTHX_ GV *gv)
562 HV* stash = gv_stashpvn("Errno",5,FALSE);
564 if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
568 save_scalar(gv); /* keep the value of $! */
569 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
570 newSVpvn("Errno",5), Nullsv);
573 stash = gv_stashpvn("Errno",5,FALSE);
574 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
575 Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available");
580 =for apidoc gv_stashpv
582 Returns a pointer to the stash for a specified package. C<name> should
583 be a valid UTF-8 string and must be null-terminated. If C<create> is set
584 then the package will be created if it does not already exist. If C<create>
585 is not set and the package does not exist then NULL is returned.
591 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
593 return gv_stashpvn(name, strlen(name), create);
597 =for apidoc gv_stashpvn
599 Returns a pointer to the stash for a specified package. C<name> should
600 be a valid UTF-8 string. The C<namelen> parameter indicates the length of
601 the C<name>, in bytes. If C<create> is set then the package will be
602 created if it does not already exist. If C<create> is not set and the
603 package does not exist then NULL is returned.
609 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
616 if (namelen + 3 < sizeof smallbuf)
619 New(606, tmpbuf, namelen + 3, char);
620 Copy(name,tmpbuf,namelen,char);
621 tmpbuf[namelen++] = ':';
622 tmpbuf[namelen++] = ':';
623 tmpbuf[namelen] = '\0';
624 tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV);
625 if (tmpbuf != smallbuf)
630 GvHV(tmpgv) = newHV();
633 HvNAME(stash) = savepv(name);
638 =for apidoc gv_stashsv
640 Returns a pointer to the stash for a specified package, which must be a
641 valid UTF-8 string. See C<gv_stashpv>.
647 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
650 const char *ptr = SvPV(sv,len);
651 return gv_stashpvn(ptr, len, create);
656 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
657 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
661 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
663 const char *nambeg = SvPV(name, len);
664 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
668 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
671 register const char *name = nambeg;
675 register const char *namend;
677 const I32 add = flags & ~SVf_UTF8;
680 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
683 for (namend = name; *namend; namend++) {
684 if ((*namend == ':' && namend[1] == ':')
685 || (*namend == '\'' && namend[1]))
689 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
697 if (len + 3 < sizeof (smallbuf))
700 New(601, tmpbuf, len+3, char);
701 Copy(name, tmpbuf, len, char);
705 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
706 gv = gvp ? *gvp : Nullgv;
707 if (gv && gv != (GV*)&PL_sv_undef) {
708 if (SvTYPE(gv) != SVt_PVGV)
709 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
713 if (tmpbuf != smallbuf)
715 if (!gv || gv == (GV*)&PL_sv_undef)
718 if (!(stash = GvHV(gv)))
719 stash = GvHV(gv) = newHV();
722 HvNAME(stash) = savepvn(nambeg, namend - nambeg);
730 return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE);
735 /* No stash in name, so see how we can default */
738 if (isIDFIRST_lazy(name)) {
741 /* name is always \0 terminated, and initial \0 wouldn't return
742 true from isIDFIRST_lazy, so we know that name[1] is defined */
749 if (strEQ(name, "INC") || strEQ(name, "ENV"))
753 if (strEQ(name, "SIG"))
757 if (strEQ(name, "STDIN") || strEQ(name, "STDOUT") ||
758 strEQ(name, "STDERR"))
762 if (strEQ(name, "ARGV") || strEQ(name, "ARGVOUT"))
769 else if (IN_PERL_COMPILETIME) {
771 if (add && (PL_hints & HINT_STRICT_VARS) &&
772 sv_type != SVt_PVCV &&
773 sv_type != SVt_PVGV &&
774 sv_type != SVt_PVFM &&
775 sv_type != SVt_PVIO &&
776 !(len == 1 && sv_type == SVt_PV &&
777 (*name == 'a' || *name == 'b')) )
779 gvp = (GV**)hv_fetch(stash,name,len,0);
781 *gvp == (GV*)&PL_sv_undef ||
782 SvTYPE(*gvp) != SVt_PVGV)
786 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
787 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
788 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
790 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
791 sv_type == SVt_PVAV ? '@' :
792 sv_type == SVt_PVHV ? '%' : '$',
795 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
801 stash = CopSTASH(PL_curcop);
807 /* By this point we should have a stash and a name */
811 register SV *err = Perl_mess(aTHX_
812 "Global symbol \"%s%s\" requires explicit package name",
813 (sv_type == SVt_PV ? "$"
814 : sv_type == SVt_PVAV ? "@"
815 : sv_type == SVt_PVHV ? "%"
817 if (USE_UTF8_IN_NAMES)
820 stash = GvHV(gv_fetchpv("<none>::", GV_ADDMULTI, SVt_PVHV));
826 if (!SvREFCNT(stash)) /* symbol table under destruction */
829 gvp = (GV**)hv_fetch(stash,name,len,add);
830 if (!gvp || *gvp == (GV*)&PL_sv_undef)
833 if (SvTYPE(gv) == SVt_PVGV) {
836 gv_init_sv(gv, sv_type);
837 if (*name=='!' && sv_type == SVt_PVHV && len==1)
841 } else if (add & GV_NOINIT) {
845 /* Adding a new symbol */
847 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
848 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
849 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
850 gv_init_sv(gv, sv_type);
852 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
853 : (PL_dowarn & G_WARN_ON ) ) )
856 /* set up magic where warranted */
860 /* Nothing else to do.
861 The compiler will probably turn the switch statement into a
862 branch table. Make sure we avoid even that small overhead for
863 the common case of lower case variable names. */
867 const char *name2 = name + 1;
870 if (strEQ(name2, "RGV")) {
871 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
875 if (strnEQ(name2, "XPORT", 5))
879 if (strEQ(name2, "SA")) {
882 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, Nullch, 0);
883 /* NOTE: No support for tied ISA */
884 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
885 && AvFILLp(av) == -1)
888 av_push(av, newSVpvn(pname = "NDBM_File",9));
889 gv_stashpvn(pname, 9, TRUE);
890 av_push(av, newSVpvn(pname = "DB_File",7));
891 gv_stashpvn(pname, 7, TRUE);
892 av_push(av, newSVpvn(pname = "GDBM_File",9));
893 gv_stashpvn(pname, 9, TRUE);
894 av_push(av, newSVpvn(pname = "SDBM_File",9));
895 gv_stashpvn(pname, 9, TRUE);
896 av_push(av, newSVpvn(pname = "ODBM_File",9));
897 gv_stashpvn(pname, 9, TRUE);
902 if (strEQ(name2, "VERLOAD")) {
905 hv_magic(hv, Nullgv, PERL_MAGIC_overload);
909 if (strEQ(name2, "IG")) {
913 Newz(73, PL_psig_ptr, SIG_SIZE, SV*);
914 Newz(73, PL_psig_name, SIG_SIZE, SV*);
915 Newz(73, PL_psig_pend, SIG_SIZE, int);
919 hv_magic(hv, Nullgv, PERL_MAGIC_sig);
920 for (i = 1; i < SIG_SIZE; i++) {
922 init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
924 sv_setsv(*init, &PL_sv_undef);
932 if (strEQ(name2, "ERSION"))
935 case '\005': /* $^ENCODING */
936 if (strEQ(name2, "NCODING"))
939 case '\017': /* $^OPEN */
940 if (strEQ(name2, "PEN"))
943 case '\024': /* ${^TAINT} */
944 if (strEQ(name2, "AINT"))
947 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
948 if (strEQ(name2, "NICODE"))
950 if (strEQ(name2, "TF8LOCALE"))
953 case '\027': /* $^WARNING_BITS */
954 if (strEQ(name2, "ARNING_BITS"))
967 /* ensures variable is only digits */
968 /* ${"1foo"} fails this test (and is thus writeable) */
969 /* added by japhy, but borrowed from is_gv_magical */
970 const char *end = name + len;
971 while (--end > name) {
972 if (!isDIGIT(*end)) return gv;
979 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
980 be case '\0' in this switch statement (ie a default case) */
986 sv_type == SVt_PVAV ||
987 sv_type == SVt_PVHV ||
988 sv_type == SVt_PVCV ||
989 sv_type == SVt_PVFM ||
992 PL_sawampersand = TRUE;
996 sv_setpv(GvSV(gv),PL_chopset);
1000 #ifdef COMPLEX_STATUS
1001 (void)SvUPGRADE(GvSV(gv), SVt_PVLV);
1007 /* If %! has been used, automatically load Errno.pm.
1008 The require will itself set errno, so in order to
1009 preserve its value we have to set up the magic
1010 now (rather than going to magicalize)
1013 sv_magic(GvSV(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1015 if (sv_type == SVt_PVHV)
1022 sv_magic((SV*)av, Nullsv, PERL_MAGIC_regdata, Nullch, 0);
1027 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1028 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1029 "$* is no longer supported");
1032 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1033 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1034 "Use of $# is deprecated");
1037 sv_setiv(GvSV(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1043 sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, Nullch, 0);
1047 case '\023': /* $^S */
1058 SvREADONLY_on(GvSV(gv));
1073 case '\001': /* $^A */
1074 case '\003': /* $^C */
1075 case '\004': /* $^D */
1076 case '\005': /* $^E */
1077 case '\006': /* $^F */
1078 case '\010': /* $^H */
1079 case '\011': /* $^I, NOT \t in EBCDIC */
1080 case '\016': /* $^N */
1081 case '\017': /* $^O */
1082 case '\020': /* $^P */
1083 case '\024': /* $^T */
1084 case '\027': /* $^W */
1086 sv_magic(GvSV(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1089 case '\014': /* $^L */
1090 sv_setpv(GvSV(gv),"\f");
1091 PL_formfeed = GvSV(gv);
1094 sv_setpv(GvSV(gv),"\034");
1099 if (!sv_derived_from(PL_patchlevel, "version"))
1100 (void *)upg_version(PL_patchlevel);
1101 GvSV(gv) = vnumify(PL_patchlevel);
1102 SvREADONLY_on(GvSV(gv));
1106 case '\026': /* $^V */
1108 SV * const sv = GvSV(gv);
1109 GvSV(gv) = new_version(PL_patchlevel);
1110 SvREADONLY_on(GvSV(gv));
1120 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1123 const HV * const hv = GvSTASH(gv);
1128 sv_setpv(sv, prefix ? prefix : "");
1134 if (keepmain || strNE(name, "main")) {
1136 sv_catpvn(sv,"::", 2);
1138 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1142 Perl_gv_fullname3(pTHX_ SV *sv, const GV *gv, const char *prefix)
1144 gv_fullname4(sv, gv, prefix, TRUE);
1148 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1150 const GV *egv = GvEGV(gv);
1153 gv_fullname4(sv, egv, prefix, keepmain);
1157 Perl_gv_efullname3(pTHX_ SV *sv, const GV *gv, const char *prefix)
1159 gv_efullname4(sv, gv, prefix, TRUE);
1162 /* compatibility with versions <= 5.003. */
1164 Perl_gv_fullname(pTHX_ SV *sv, const GV *gv)
1166 gv_fullname3(sv, gv, sv == (const SV*)gv ? "*" : "");
1169 /* compatibility with versions <= 5.003. */
1171 Perl_gv_efullname(pTHX_ SV *sv, const GV *gv)
1173 gv_efullname3(sv, gv, sv == (const SV*)gv ? "*" : "");
1180 IO * const io = (IO*)NEWSV(0,0);
1182 sv_upgrade((SV *)io,SVt_PVIO);
1185 /* Clear the stashcache because a new IO could overrule a
1187 hv_clear(PL_stashcache);
1188 iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV);
1189 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1190 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1191 iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV);
1192 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1197 Perl_gv_check(pTHX_ HV *stash)
1201 if (!HvARRAY(stash))
1203 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1205 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1208 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1209 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1211 if (hv != PL_defstash && hv != stash)
1212 gv_check(hv); /* nested package */
1214 else if (isALPHA(*HeKEY(entry))) {
1216 gv = (GV*)HeVAL(entry);
1217 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1220 /* performance hack: if filename is absolute and it's a standard
1221 * module, don't bother warning */
1223 && PERL_FILE_IS_ABSOLUTE(file)
1224 #ifdef MACOS_TRADITIONAL
1225 && (instr(file, ":lib:")
1227 && (instr(file, "/lib/")
1229 || instr(file, ".pm")))
1233 CopLINE_set(PL_curcop, GvLINE(gv));
1235 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1237 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1239 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1240 "Name \"%s::%s\" used only once: possible typo",
1241 HvNAME(stash), GvNAME(gv));
1248 Perl_newGVgen(pTHX_ const char *pack)
1250 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1254 /* hopefully this is only called on local symbol table entries */
1257 Perl_gp_ref(pTHX_ GP *gp)
1264 /* multi-named GPs cannot be used for method cache */
1265 SvREFCNT_dec(gp->gp_cv);
1270 /* Adding a new name to a subroutine invalidates method cache */
1271 PL_sub_generation++;
1278 Perl_gp_free(pTHX_ GV *gv)
1282 if (!gv || !(gp = GvGP(gv)))
1284 if (gp->gp_refcnt == 0) {
1285 if (ckWARN_d(WARN_INTERNAL))
1286 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1287 "Attempt to free unreferenced glob pointers"
1288 pTHX__FORMAT pTHX__VALUE);
1292 /* Deleting the name of a subroutine invalidates method cache */
1293 PL_sub_generation++;
1295 if (--gp->gp_refcnt > 0) {
1296 if (gp->gp_egv == gv)
1301 if (gp->gp_sv) SvREFCNT_dec(gp->gp_sv);
1302 if (gp->gp_av) SvREFCNT_dec(gp->gp_av);
1304 if (PL_stashcache && HvNAME(gp->gp_hv))
1305 hv_delete(PL_stashcache,
1306 HvNAME(gp->gp_hv), strlen(HvNAME(gp->gp_hv)),
1308 SvREFCNT_dec(gp->gp_hv);
1310 if (gp->gp_io) SvREFCNT_dec(gp->gp_io);
1311 if (gp->gp_cv) SvREFCNT_dec(gp->gp_cv);
1312 if (gp->gp_form) SvREFCNT_dec(gp->gp_form);
1319 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1321 AMT *amtp = (AMT*)mg->mg_ptr;
1324 if (amtp && AMT_AMAGIC(amtp)) {
1326 for (i = 1; i < NofAMmeth; i++) {
1327 CV *cv = amtp->table[i];
1329 SvREFCNT_dec((SV *) cv);
1330 amtp->table[i] = Nullcv;
1337 /* Updates and caches the CV's */
1340 Perl_Gv_AMupdate(pTHX_ HV *stash)
1344 MAGIC* mg=mg_find((SV*)stash, PERL_MAGIC_overload_table);
1345 AMT *amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
1348 if (mg && amtp->was_ok_am == PL_amagic_generation
1349 && amtp->was_ok_sub == PL_sub_generation)
1350 return (bool)AMT_OVERLOADED(amtp);
1351 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1353 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME(stash)) );
1356 amt.was_ok_am = PL_amagic_generation;
1357 amt.was_ok_sub = PL_sub_generation;
1358 amt.fallback = AMGfallNO;
1362 int filled = 0, have_ovl = 0;
1366 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1368 /* Try to find via inheritance. */
1369 gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1374 lim = DESTROY_amg; /* Skip overloading entries. */
1375 else if (SvTRUE(sv))
1376 amt.fallback=AMGfallYES;
1378 amt.fallback=AMGfallNEVER;
1380 for (i = 1; i < lim; i++)
1381 amt.table[i] = Nullcv;
1382 for (; i < NofAMmeth; i++) {
1383 const char *cooky = PL_AMG_names[i];
1384 /* Human-readable form, for debugging: */
1385 const char *cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1386 const STRLEN l = strlen(cooky);
1388 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of `%s' in package `%.256s'\n",
1389 cp, HvNAME(stash)) );
1390 /* don't fill the cache while looking up!
1391 Creation of inheritance stubs in intermediate packages may
1392 conflict with the logic of runtime method substitution.
1393 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1394 then we could have created stubs for "(+0" in A and C too.
1395 But if B overloads "bool", we may want to use it for
1396 numifying instead of C's "+0". */
1397 if (i >= DESTROY_amg)
1398 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1399 else /* Autoload taken care of below */
1400 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1402 if (gv && (cv = GvCV(gv))) {
1403 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1404 && strEQ(HvNAME(GvSTASH(CvGV(cv))), "overload")) {
1405 /* This is a hack to support autoloading..., while
1406 knowing *which* methods were declared as overloaded. */
1407 /* GvSV contains the name of the method. */
1410 DEBUG_o( Perl_deb(aTHX_ "Resolving method `%"SVf256\
1411 "' for overloaded `%s' in package `%.256s'\n",
1412 GvSV(gv), cp, HvNAME(stash)) );
1413 if (!SvPOK(GvSV(gv))
1414 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX(GvSV(gv)),
1417 /* Can be an import stub (created by `can'). */
1418 SV *gvsv = GvSV(gv);
1419 const char *name = SvPOK(gvsv) ? SvPVX(gvsv) : "???";
1420 Perl_croak(aTHX_ "%s method `%.256s' overloading `%s' "\
1421 "in package `%.256s'",
1422 (GvCVGEN(gv) ? "Stub found while resolving"
1424 name, cp, HvNAME(stash));
1426 cv = GvCV(gv = ngv);
1428 DEBUG_o( Perl_deb(aTHX_ "Overloading `%s' in package `%.256s' via `%.256s::%.256s' \n",
1429 cp, HvNAME(stash), HvNAME(GvSTASH(CvGV(cv))),
1430 GvNAME(CvGV(cv))) );
1432 if (i < DESTROY_amg)
1434 } else if (gv) { /* Autoloaded... */
1438 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1441 AMT_AMAGIC_on(&amt);
1443 AMT_OVERLOADED_on(&amt);
1444 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1445 (char*)&amt, sizeof(AMT));
1449 /* Here we have no table: */
1451 AMT_AMAGIC_off(&amt);
1452 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1453 (char*)&amt, sizeof(AMTS));
1459 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1464 if (!stash || !HvNAME(stash))
1466 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1470 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1472 amtp = (AMT*)mg->mg_ptr;
1473 if ( amtp->was_ok_am != PL_amagic_generation
1474 || amtp->was_ok_sub != PL_sub_generation )
1476 if (AMT_AMAGIC(amtp)) {
1477 CV * const ret = amtp->table[id];
1478 if (ret && isGV(ret)) { /* Autoloading stab */
1479 /* Passing it through may have resulted in a warning
1480 "Inherited AUTOLOAD for a non-method deprecated", since
1481 our caller is going through a function call, not a method call.
1482 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1483 GV *gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1496 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1501 CV **cvp=NULL, **ocvp=NULL;
1502 AMT *amtp=NULL, *oamtp=NULL;
1503 int off=0, off1, lr=0, assign=AMGf_assign & flags, notfound=0;
1504 int postpr = 0, force_cpy = 0, assignshift = assign ? 1 : 0;
1509 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1510 && (stash = SvSTASH(SvRV(left)))
1511 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1512 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1513 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1515 && ((cv = cvp[off=method+assignshift])
1516 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1522 cv = cvp[off=method])))) {
1523 lr = -1; /* Call method for left argument */
1525 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1528 /* look for substituted methods */
1529 /* In all the covered cases we should be called with assign==0. */
1533 if ((cv = cvp[off=add_ass_amg])
1534 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1535 right = &PL_sv_yes; lr = -1; assign = 1;
1540 if ((cv = cvp[off = subtr_ass_amg])
1541 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1542 right = &PL_sv_yes; lr = -1; assign = 1;
1546 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1549 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1552 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1555 (void)((cv = cvp[off=bool__amg])
1556 || (cv = cvp[off=numer_amg])
1557 || (cv = cvp[off=string_amg]));
1563 * SV* ref causes confusion with the interpreter variable of
1566 SV* tmpRef=SvRV(left);
1567 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1569 * Just to be extra cautious. Maybe in some
1570 * additional cases sv_setsv is safe, too.
1572 SV* newref = newSVsv(tmpRef);
1573 SvOBJECT_on(newref);
1574 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1580 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1581 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1582 SV* nullsv=sv_2mortal(newSViv(0));
1584 SV* lessp = amagic_call(left,nullsv,
1585 lt_amg,AMGf_noright);
1586 logic = SvTRUE(lessp);
1588 SV* lessp = amagic_call(left,nullsv,
1589 ncmp_amg,AMGf_noright);
1590 logic = (SvNV(lessp) < 0);
1593 if (off==subtr_amg) {
1604 if ((cv = cvp[off=subtr_amg])) {
1606 left = sv_2mortal(newSViv(0));
1611 case iter_amg: /* XXXX Eventually should do to_gv. */
1613 return NULL; /* Delegate operation to standard mechanisms. */
1621 return left; /* Delegate operation to standard mechanisms. */
1626 if (!cv) goto not_found;
1627 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1628 && (stash = SvSTASH(SvRV(right)))
1629 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1630 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1631 ? (amtp = (AMT*)mg->mg_ptr)->table
1633 && (cv = cvp[off=method])) { /* Method for right
1636 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1637 && (cvp=ocvp) && (lr = -1))
1638 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1639 && !(flags & AMGf_unary)) {
1640 /* We look for substitution for
1641 * comparison operations and
1643 if (method==concat_amg || method==concat_ass_amg
1644 || method==repeat_amg || method==repeat_ass_amg) {
1645 return NULL; /* Delegate operation to string conversion */
1655 postpr = 1; off=ncmp_amg; break;
1662 postpr = 1; off=scmp_amg; break;
1664 if (off != -1) cv = cvp[off];
1669 not_found: /* No method found, either report or croak */
1677 return left; /* Delegate operation to standard mechanisms. */
1680 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1681 notfound = 1; lr = -1;
1682 } else if (cvp && (cv=cvp[nomethod_amg])) {
1683 notfound = 1; lr = 1;
1686 if (off==-1) off=method;
1687 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1688 "Operation `%s': no method found,%sargument %s%s%s%s",
1689 AMG_id2name(method + assignshift),
1690 (flags & AMGf_unary ? " " : "\n\tleft "),
1692 "in overloaded package ":
1693 "has no overloaded magic",
1695 HvNAME(SvSTASH(SvRV(left))):
1698 ",\n\tright argument in overloaded package ":
1701 : ",\n\tright argument has no overloaded magic"),
1703 HvNAME(SvSTASH(SvRV(right))):
1705 if (amtp && amtp->fallback >= AMGfallYES) {
1706 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX(msg)) );
1708 Perl_croak(aTHX_ "%"SVf, msg);
1712 force_cpy = force_cpy || assign;
1717 DEBUG_o(Perl_deb(aTHX_
1718 "Overloaded operator `%s'%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1720 method+assignshift==off? "" :
1722 method+assignshift==off? "" :
1723 AMG_id2name(method+assignshift),
1724 method+assignshift==off? "" : "')",
1725 flags & AMGf_unary? "" :
1726 lr==1 ? " for right argument": " for left argument",
1727 flags & AMGf_unary? " for argument" : "",
1728 stash ? HvNAME(stash) : "null",
1729 fl? ",\n\tassignment variant used": "") );
1732 /* Since we use shallow copy during assignment, we need
1733 * to dublicate the contents, probably calling user-supplied
1734 * version of copy operator
1736 /* We need to copy in following cases:
1737 * a) Assignment form was called.
1738 * assignshift==1, assign==T, method + 1 == off
1739 * b) Increment or decrement, called directly.
1740 * assignshift==0, assign==0, method + 0 == off
1741 * c) Increment or decrement, translated to assignment add/subtr.
1742 * assignshift==0, assign==T,
1744 * d) Increment or decrement, translated to nomethod.
1745 * assignshift==0, assign==0,
1747 * e) Assignment form translated to nomethod.
1748 * assignshift==1, assign==T, method + 1 != off
1751 /* off is method, method+assignshift, or a result of opcode substitution.
1752 * In the latter case assignshift==0, so only notfound case is important.
1754 if (( (method + assignshift == off)
1755 && (assign || (method == inc_amg) || (method == dec_amg)))
1762 const bool oldcatch = CATCH_GET;
1765 Zero(&myop, 1, BINOP);
1766 myop.op_last = (OP *) &myop;
1767 myop.op_next = Nullop;
1768 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1770 PUSHSTACKi(PERLSI_OVERLOAD);
1773 PL_op = (OP *) &myop;
1774 if (PERLDB_SUB && PL_curstash != PL_debstash)
1775 PL_op->op_private |= OPpENTERSUB_DB;
1779 EXTEND(SP, notfound + 5);
1780 PUSHs(lr>0? right: left);
1781 PUSHs(lr>0? left: right);
1782 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1784 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1789 if ((PL_op = Perl_pp_entersub(aTHX)))
1797 CATCH_SET(oldcatch);
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 ans=SvIV(res)!=0; break;
1822 SvSetSV(left,res); return left;
1824 ans=!SvTRUE(res); break;
1829 } else if (method==copy_amg) {
1831 Perl_croak(aTHX_ "Copy method did not return a reference");
1833 return SvREFCNT_inc(SvRV(res));
1841 =for apidoc is_gv_magical_sv
1843 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
1849 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
1852 const char *temp = SvPV(name, len);
1853 return is_gv_magical(temp, len, flags);
1857 =for apidoc is_gv_magical
1859 Returns C<TRUE> if given the name of a magical GV.
1861 Currently only useful internally when determining if a GV should be
1862 created even in rvalue contexts.
1864 C<flags> is not used at present but available for future extension to
1865 allow selecting particular classes of magical variable.
1867 Currently assumes that C<name> is NUL terminated (as well as len being valid).
1868 This assumption is met by all callers within the perl core, which all pass
1869 pointers returned by SvPV.
1874 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
1878 const char *name1 = name + 1;
1881 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
1885 if (len == 8 && strEQ(name1, "VERLOAD"))
1889 if (len == 3 && name[1] == 'I' && name[2] == 'G')
1892 /* Using ${^...} variables is likely to be sufficiently rare that
1893 it seems sensible to avoid the space hit of also checking the
1895 case '\017': /* ${^OPEN} */
1896 if (strEQ(name1, "PEN"))
1899 case '\024': /* ${^TAINT} */
1900 if (strEQ(name1, "AINT"))
1903 case '\025': /* ${^UNICODE} */
1904 if (strEQ(name1, "NICODE"))
1906 if (strEQ(name1, "TF8LOCALE"))
1909 case '\027': /* ${^WARNING_BITS} */
1910 if (strEQ(name1, "ARNING_BITS"))
1923 const char *end = name + len;
1924 while (--end > name) {
1932 /* Because we're already assuming that name is NUL terminated
1933 below, we can treat an empty name as "\0" */
1960 case '\001': /* $^A */
1961 case '\003': /* $^C */
1962 case '\004': /* $^D */
1963 case '\005': /* $^E */
1964 case '\006': /* $^F */
1965 case '\010': /* $^H */
1966 case '\011': /* $^I, NOT \t in EBCDIC */
1967 case '\014': /* $^L */
1968 case '\016': /* $^N */
1969 case '\017': /* $^O */
1970 case '\020': /* $^P */
1971 case '\023': /* $^S */
1972 case '\024': /* $^T */
1973 case '\026': /* $^V */
1974 case '\027': /* $^W */
1995 * c-indentation-style: bsd
1997 * indent-tabs-mode: t
2000 * ex: set ts=8 sts=4 sw=4 noet: