3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 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 in 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,'
19 * [p.599 of _The Lord of the Rings_, III/xi: "The PalantÃr"]
25 A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
26 It is a structure that holds a pointer to a scalar, an array, a hash etc,
27 corresponding to $foo, @foo, %foo.
29 GVs are usually found as values in stashes (symbol table hashes) where
30 Perl stores its global variables.
40 static const char S_autoload[] = "AUTOLOAD";
41 static const STRLEN S_autolen = sizeof(S_autoload)-1;
44 Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
51 SvTYPE((const SV *)gv) != SVt_PVGV
52 && SvTYPE((const SV *)gv) != SVt_PVLV
56 if (type == SVt_PVIO) {
58 * if it walks like a dirhandle, then let's assume that
59 * this is a dirhandle.
61 what = PL_op->op_type == OP_READDIR ||
62 PL_op->op_type == OP_TELLDIR ||
63 PL_op->op_type == OP_SEEKDIR ||
64 PL_op->op_type == OP_REWINDDIR ||
65 PL_op->op_type == OP_CLOSEDIR ?
66 "dirhandle" : "filehandle";
67 /* diag_listed_as: Bad symbol for filehandle */
68 } else if (type == SVt_PVHV) {
71 what = type == SVt_PVAV ? "array" : "scalar";
73 Perl_croak(aTHX_ "Bad symbol for %s", what);
76 if (type == SVt_PVHV) {
77 where = (SV **)&GvHV(gv);
78 } else if (type == SVt_PVAV) {
79 where = (SV **)&GvAV(gv);
80 } else if (type == SVt_PVIO) {
81 where = (SV **)&GvIOp(gv);
87 *where = newSV_type(type);
92 Perl_gv_fetchfile(pTHX_ const char *name)
94 PERL_ARGS_ASSERT_GV_FETCHFILE;
95 return gv_fetchfile_flags(name, strlen(name), 0);
99 Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
105 const STRLEN tmplen = namelen + 2;
108 PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS;
109 PERL_UNUSED_ARG(flags);
114 if (tmplen <= sizeof smallbuf)
117 Newx(tmpbuf, tmplen, char);
118 /* This is where the debugger's %{"::_<$filename"} hash is created */
121 memcpy(tmpbuf + 2, name, namelen);
122 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
124 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
125 #ifdef PERL_DONT_CREATE_GVSV
126 GvSV(gv) = newSVpvn(name, namelen);
128 sv_setpvn(GvSV(gv), name, namelen);
131 if ((PERLDB_LINE || PERLDB_SAVESRC) && !GvAV(gv))
132 hv_magic(GvHVn(gv_AVadd(gv)), NULL, PERL_MAGIC_dbfile);
133 if (tmpbuf != smallbuf)
139 =for apidoc gv_const_sv
141 If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
142 inlining, or C<gv> is a placeholder reference that would be promoted to such
143 a typeglob, then returns the value returned by the sub. Otherwise, returns
150 Perl_gv_const_sv(pTHX_ GV *gv)
152 PERL_ARGS_ASSERT_GV_CONST_SV;
154 if (SvTYPE(gv) == SVt_PVGV)
155 return cv_const_sv(GvCVu(gv));
156 return SvROK(gv) ? SvRV(gv) : NULL;
160 Perl_newGP(pTHX_ GV *const gv)
165 const char *const file
166 = (PL_curcop && CopFILE(PL_curcop)) ? CopFILE(PL_curcop) : "";
167 const STRLEN len = strlen(file);
169 SV *const temp_sv = CopFILESV(PL_curcop);
173 PERL_ARGS_ASSERT_NEWGP;
176 file = SvPVX(temp_sv);
177 len = SvCUR(temp_sv);
184 PERL_HASH(hash, file, len);
188 #ifndef PERL_DONT_CREATE_GVSV
189 gp->gp_sv = newSV(0);
192 gp->gp_line = PL_curcop ? CopLINE(PL_curcop) : 0;
193 /* XXX Ideally this cast would be replaced with a change to const char*
195 gp->gp_file_hek = share_hek(file, len, hash);
202 /* Assign CvGV(cv) = gv, handling weak references.
203 * See also S_anonymise_cv_maybe */
206 Perl_cvgv_set(pTHX_ CV* cv, GV* gv)
208 GV * const oldgv = CvGV(cv);
209 PERL_ARGS_ASSERT_CVGV_SET;
220 sv_del_backref(MUTABLE_SV(oldgv), MUTABLE_SV(cv));
224 SvANY(cv)->xcv_gv = gv;
225 assert(!CvCVGV_RC(cv));
230 if (isGV_with_GP(gv) && GvGP(gv) && (GvCV(gv) == cv || GvFORM(gv) == cv))
231 Perl_sv_add_backref(aTHX_ MUTABLE_SV(gv), MUTABLE_SV(cv));
234 SvREFCNT_inc_simple_void_NN(gv);
238 /* Assign CvSTASH(cv) = st, handling weak references. */
241 Perl_cvstash_set(pTHX_ CV *cv, HV *st)
243 HV *oldst = CvSTASH(cv);
244 PERL_ARGS_ASSERT_CVSTASH_SET;
248 sv_del_backref(MUTABLE_SV(oldst), MUTABLE_SV(cv));
249 SvANY(cv)->xcv_stash = st;
251 Perl_sv_add_backref(aTHX_ MUTABLE_SV(st), MUTABLE_SV(cv));
255 Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
258 const U32 old_type = SvTYPE(gv);
259 const bool doproto = old_type > SVt_NULL;
260 char * const proto = (doproto && SvPOK(gv)) ? SvPVX(gv) : NULL;
261 const STRLEN protolen = proto ? SvCUR(gv) : 0;
262 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
263 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
265 PERL_ARGS_ASSERT_GV_INIT;
266 assert (!(proto && has_constant));
269 /* The constant has to be a simple scalar type. */
270 switch (SvTYPE(has_constant)) {
276 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
277 sv_reftype(has_constant, 0));
285 if (old_type < SVt_PVGV) {
286 if (old_type >= SVt_PV)
288 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
296 Safefree(SvPVX_mutable(gv));
301 GvGP_set(gv, Perl_newGP(aTHX_ gv));
304 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
305 gv_name_set(gv, name, len, GV_ADD);
306 if (multi || doproto) /* doproto means it _was_ mentioned */
308 if (doproto) { /* Replicate part of newSUB here. */
314 /* newCONSTSUB doesn't take a len arg, so make sure we
315 * give it a \0-terminated string */
316 name0 = savepvn(name,len);
318 /* newCONSTSUB takes ownership of the reference from us. */
319 cv = newCONSTSUB(stash, (name0 ? name0 : name), has_constant);
320 /* In case op.c:S_process_special_blocks stole it: */
322 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
323 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
326 /* If this reference was a copy of another, then the subroutine
327 must have been "imported", by a Perl space assignment to a GV
328 from a reference to CV. */
329 if (exported_constant)
330 GvIMPORTED_CV_on(gv);
332 (void) start_subparse(0,0); /* Create empty CV in compcv. */
338 mro_method_changed_in(GvSTASH(gv)); /* sub Foo::bar($) { (shift) } sub ASDF::baz($); *ASDF::baz = \&Foo::bar */
340 CvFILE_set_from_cop(cv, PL_curcop);
341 CvSTASH_set(cv, PL_curstash);
343 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
344 SV_HAS_TRAILING_NUL);
350 S_gv_init_sv(pTHX_ GV *gv, const svtype sv_type)
352 PERL_ARGS_ASSERT_GV_INIT_SV;
364 #ifdef PERL_DONT_CREATE_GVSV
372 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
373 If we just cast GvSVn(gv) to void, it ignores evaluating it for
381 =for apidoc gv_fetchmeth
383 Returns the glob with the given C<name> and a defined subroutine or
384 C<NULL>. The glob lives in the given C<stash>, or in the stashes
385 accessible via @ISA and UNIVERSAL::.
387 The argument C<level> should be either 0 or -1. If C<level==0>, as a
388 side-effect creates a glob with the given C<name> in the given C<stash>
389 which in the case of success contains an alias for the subroutine, and sets
390 up caching info for this glob.
392 This function grants C<"SUPER"> token as a postfix of the stash name. The
393 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
394 visible to Perl code. So when calling C<call_sv>, you should not use
395 the GV directly; instead, you should use the method's CV, which can be
396 obtained from the GV with the C<GvCV> macro.
401 /* NOTE: No support for tied ISA */
404 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
412 GV* candidate = NULL;
416 I32 create = (level >= 0) ? 1 : 0;
421 PERL_ARGS_ASSERT_GV_FETCHMETH;
423 /* UNIVERSAL methods should be callable without a stash */
425 create = 0; /* probably appropriate */
426 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
432 hvname = HvNAME_get(stash);
434 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
439 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
441 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
443 /* check locally for a real method or a cache entry */
444 gvp = (GV**)hv_fetch(stash, name, len, create);
448 if (SvTYPE(topgv) != SVt_PVGV)
449 gv_init(topgv, stash, name, len, TRUE);
450 if ((cand_cv = GvCV(topgv))) {
451 /* If genuine method or valid cache entry, use it */
452 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
456 /* stale cache entry, junk it and move on */
457 SvREFCNT_dec(cand_cv);
458 GvCV_set(topgv, NULL);
463 else if (GvCVGEN(topgv) == topgen_cmp) {
464 /* cache indicates no such method definitively */
469 packlen = HvNAMELEN_get(stash);
470 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
473 basestash = gv_stashpvn(hvname, packlen, GV_ADD);
474 linear_av = mro_get_linear_isa(basestash);
477 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
480 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
481 items = AvFILLp(linear_av); /* no +1, to skip over self */
483 linear_sv = *linear_svp++;
485 cstash = gv_stashsv(linear_sv, 0);
488 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX), "Can't locate package %"SVf" for @%s::ISA",
489 SVfARG(linear_sv), hvname);
495 gvp = (GV**)hv_fetch(cstash, name, len, 0);
499 if (SvTYPE(candidate) != SVt_PVGV) gv_init(candidate, cstash, name, len, TRUE);
500 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
502 * Found real method, cache method in topgv if:
503 * 1. topgv has no synonyms (else inheritance crosses wires)
504 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
506 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
507 CV *old_cv = GvCV(topgv);
508 SvREFCNT_dec(old_cv);
509 SvREFCNT_inc_simple_void_NN(cand_cv);
510 GvCV_set(topgv, cand_cv);
511 GvCVGEN(topgv) = topgen_cmp;
517 /* Check UNIVERSAL without caching */
518 if(level == 0 || level == -1) {
519 candidate = gv_fetchmeth(NULL, name, len, 1);
521 cand_cv = GvCV(candidate);
522 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
523 CV *old_cv = GvCV(topgv);
524 SvREFCNT_dec(old_cv);
525 SvREFCNT_inc_simple_void_NN(cand_cv);
526 GvCV_set(topgv, cand_cv);
527 GvCVGEN(topgv) = topgen_cmp;
533 if (topgv && GvREFCNT(topgv) == 1) {
534 /* cache the fact that the method is not defined */
535 GvCVGEN(topgv) = topgen_cmp;
542 =for apidoc gv_fetchmeth_autoload
544 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
545 Returns a glob for the subroutine.
547 For an autoloaded subroutine without a GV, will create a GV even
548 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
549 of the result may be zero.
555 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
557 GV *gv = gv_fetchmeth(stash, name, len, level);
559 PERL_ARGS_ASSERT_GV_FETCHMETH_AUTOLOAD;
566 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
567 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
569 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
572 if (!(CvROOT(cv) || CvXSUB(cv)))
574 /* Have an autoload */
575 if (level < 0) /* Cannot do without a stub */
576 gv_fetchmeth(stash, name, len, 0);
577 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
586 =for apidoc gv_fetchmethod_autoload
588 Returns the glob which contains the subroutine to call to invoke the method
589 on the C<stash>. In fact in the presence of autoloading this may be the
590 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
593 The third parameter of C<gv_fetchmethod_autoload> determines whether
594 AUTOLOAD lookup is performed if the given method is not present: non-zero
595 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
596 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
597 with a non-zero C<autoload> parameter.
599 These functions grant C<"SUPER"> token as a prefix of the method name. Note
600 that if you want to keep the returned glob for a long time, you need to
601 check for it being "AUTOLOAD", since at the later time the call may load a
602 different subroutine due to $AUTOLOAD changing its value. Use the glob
603 created via a side effect to do this.
605 These functions have the same side-effects and as C<gv_fetchmeth> with
606 C<level==0>. C<name> should be writable if contains C<':'> or C<'
607 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
608 C<call_sv> apply equally to these functions.
614 S_gv_get_super_pkg(pTHX_ const char* name, I32 namelen)
621 PERL_ARGS_ASSERT_GV_GET_SUPER_PKG;
623 stash = gv_stashpvn(name, namelen, 0);
624 if(stash) return stash;
626 /* If we must create it, give it an @ISA array containing
627 the real package this SUPER is for, so that it's tied
628 into the cache invalidation code correctly */
629 stash = gv_stashpvn(name, namelen, GV_ADD);
630 gvp = (GV**)hv_fetchs(stash, "ISA", TRUE);
632 gv_init(gv, stash, "ISA", 3, TRUE);
633 superisa = GvAVn(gv);
635 sv_magic(MUTABLE_SV(superisa), MUTABLE_SV(gv), PERL_MAGIC_isa, NULL, 0);
637 av_push(superisa, newSVpv(CopSTASHPV(PL_curcop), 0));
639 av_push(superisa, newSVhek(CopSTASH(PL_curcop)
640 ? HvNAME_HEK(CopSTASH(PL_curcop)) : NULL));
647 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
649 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
651 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
654 /* Don't merge this yet, as it's likely to get a len parameter, and possibly
657 Perl_gv_fetchmethod_flags(pTHX_ HV *stash, const char *name, U32 flags)
660 register const char *nend;
661 const char *nsplit = NULL;
664 const char * const origname = name;
665 SV *const error_report = MUTABLE_SV(stash);
666 const U32 autoload = flags & GV_AUTOLOAD;
667 const U32 do_croak = flags & GV_CROAK;
669 PERL_ARGS_ASSERT_GV_FETCHMETHOD_FLAGS;
671 if (SvTYPE(stash) < SVt_PVHV)
674 /* The only way stash can become NULL later on is if nsplit is set,
675 which in turn means that there is no need for a SVt_PVHV case
676 the error reporting code. */
679 for (nend = name; *nend; nend++) {
684 else if (*nend == ':' && *(nend + 1) == ':') {
690 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
691 /* ->SUPER::method should really be looked up in original stash */
692 SV * const tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
693 CopSTASHPV(PL_curcop)));
694 /* __PACKAGE__::SUPER stash should be autovivified */
695 stash = gv_get_super_pkg(SvPVX_const(tmpstr), SvCUR(tmpstr));
696 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
697 origname, HvNAME_get(stash), name) );
700 /* don't autovifify if ->NoSuchStash::method */
701 stash = gv_stashpvn(origname, nsplit - origname, 0);
703 /* however, explicit calls to Pkg::SUPER::method may
704 happen, and may require autovivification to work */
705 if (!stash && (nsplit - origname) >= 7 &&
706 strnEQ(nsplit - 7, "::SUPER", 7) &&
707 gv_stashpvn(origname, nsplit - origname - 7, 0))
708 stash = gv_get_super_pkg(origname, nsplit - origname);
713 gv = gv_fetchmeth(stash, name, nend - name, 0);
715 if (strEQ(name,"import") || strEQ(name,"unimport"))
716 gv = MUTABLE_GV(&PL_sv_yes);
718 gv = gv_autoload4(ostash, name, nend - name, TRUE);
719 if (!gv && do_croak) {
720 /* Right now this is exclusively for the benefit of S_method_common
723 /* If we can't find an IO::File method, it might be a call on
724 * a filehandle. If IO:File has not been loaded, try to
725 * require it first instead of croaking */
726 const char *stash_name = HvNAME_get(stash);
727 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
728 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
729 STR_WITH_LEN("IO/File.pm"), 0,
730 HV_FETCH_ISEXISTS, NULL, 0)
732 require_pv("IO/File.pm");
733 gv = gv_fetchmeth(stash, name, nend - name, 0);
738 "Can't locate object method \"%s\" via package \"%.*s\"",
739 name, (int)HvNAMELEN_get(stash), HvNAME_get(stash));
743 const char *packname;
746 packlen = nsplit - origname;
749 packname = SvPV_const(error_report, packlen);
753 "Can't locate object method \"%s\" via package \"%.*s\""
754 " (perhaps you forgot to load \"%.*s\"?)",
755 name, (int)packlen, packname, (int)packlen, packname);
760 CV* const cv = GvCV(gv);
761 if (!CvROOT(cv) && !CvXSUB(cv)) {
769 if (GvCV(stubgv) != cv) /* orphaned import */
772 autogv = gv_autoload4(GvSTASH(stubgv),
773 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
783 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
791 const char *packname = "";
792 STRLEN packname_len = 0;
794 PERL_ARGS_ASSERT_GV_AUTOLOAD4;
796 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
799 if (SvTYPE(stash) < SVt_PVHV) {
800 packname = SvPV_const(MUTABLE_SV(stash), packname_len);
804 packname = HvNAME_get(stash);
805 packname_len = HvNAMELEN_get(stash);
808 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
812 if (!(CvROOT(cv) || CvXSUB(cv)))
816 * Inheriting AUTOLOAD for non-methods works ... for now.
818 if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
820 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
821 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
822 packname, (int)len, name);
825 /* rather than lookup/init $AUTOLOAD here
826 * only to have the XSUB do another lookup for $AUTOLOAD
827 * and split that value on the last '::',
828 * pass along the same data via some unused fields in the CV
830 CvSTASH_set(cv, stash);
831 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
837 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
838 * The subroutine's original name may not be "AUTOLOAD", so we don't
839 * use that, but for lack of anything better we will use the sub's
840 * original package to look up $AUTOLOAD.
842 varstash = GvSTASH(CvGV(cv));
843 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
847 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
848 #ifdef PERL_DONT_CREATE_GVSV
849 GvSV(vargv) = newSV(0);
853 varsv = GvSVn(vargv);
854 sv_setpvn(varsv, packname, packname_len);
855 sv_catpvs(varsv, "::");
856 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
857 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
858 sv_catpvn_mg(varsv, name, len);
863 /* require_tie_mod() internal routine for requiring a module
864 * that implements the logic of automatic ties like %! and %-
866 * The "gv" parameter should be the glob.
867 * "varpv" holds the name of the var, used for error messages.
868 * "namesv" holds the module name. Its refcount will be decremented.
869 * "methpv" holds the method name to test for to check that things
870 * are working reasonably close to as expected.
871 * "flags": if flag & 1 then save the scalar before loading.
872 * For the protection of $! to work (it is set by this routine)
873 * the sv slot must already be magicalized.
876 S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
879 HV* stash = gv_stashsv(namesv, 0);
881 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
883 if (!stash || !(gv_fetchmethod(stash, methpv))) {
884 SV *module = newSVsv(namesv);
885 char varname = *varpv; /* varpv might be clobbered by load_module,
886 so save it. For the moment it's always
892 PUSHSTACKi(PERLSI_MAGIC);
893 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
897 stash = gv_stashsv(namesv, 0);
899 Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" is not available",
900 varname, SVfARG(namesv));
901 else if (!gv_fetchmethod(stash, methpv))
902 Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" does not support method %s",
903 varname, SVfARG(namesv), methpv);
905 SvREFCNT_dec(namesv);
910 =for apidoc gv_stashpv
912 Returns a pointer to the stash for a specified package. Uses C<strlen> to
913 determine the length of C<name>, then calls C<gv_stashpvn()>.
919 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
921 PERL_ARGS_ASSERT_GV_STASHPV;
922 return gv_stashpvn(name, strlen(name), create);
926 =for apidoc gv_stashpvn
928 Returns a pointer to the stash for a specified package. The C<namelen>
929 parameter indicates the length of the C<name>, in bytes. C<flags> is passed
930 to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
931 created if it does not already exist. If the package does not exist and
932 C<flags> is 0 (or any other setting that does not create packages) then NULL
940 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
946 U32 tmplen = namelen + 2;
948 PERL_ARGS_ASSERT_GV_STASHPVN;
950 if (tmplen <= sizeof smallbuf)
953 Newx(tmpbuf, tmplen, char);
954 Copy(name, tmpbuf, namelen, char);
955 tmpbuf[namelen] = ':';
956 tmpbuf[namelen+1] = ':';
957 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
958 if (tmpbuf != smallbuf)
963 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
965 if (!HvNAME_get(stash)) {
966 hv_name_set(stash, name, namelen, 0);
968 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
969 /* If the containing stash has multiple effective
970 names, see that this one gets them, too. */
971 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
972 mro_package_moved(stash, NULL, tmpgv, 1);
978 =for apidoc gv_stashsv
980 Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
986 Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
989 const char * const ptr = SvPV_const(sv,len);
991 PERL_ARGS_ASSERT_GV_STASHSV;
993 return gv_stashpvn(ptr, len, flags);
998 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
999 PERL_ARGS_ASSERT_GV_FETCHPV;
1000 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
1004 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
1006 const char * const nambeg = SvPV_const(name, len);
1007 PERL_ARGS_ASSERT_GV_FETCHSV;
1008 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1012 S_gv_magicalize_isa(pTHX_ GV *gv)
1016 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1020 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1025 S_gv_magicalize_overload(pTHX_ GV *gv)
1029 PERL_ARGS_ASSERT_GV_MAGICALIZE_OVERLOAD;
1033 hv_magic(hv, NULL, PERL_MAGIC_overload);
1037 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
1038 const svtype sv_type)
1041 register const char *name = nambeg;
1042 register GV *gv = NULL;
1045 register const char *name_cursor;
1047 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
1048 const I32 no_expand = flags & GV_NOEXPAND;
1049 const I32 add = flags & ~GV_NOADD_MASK;
1050 const char *const name_end = nambeg + full_len;
1051 const char *const name_em1 = name_end - 1;
1054 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
1056 if (flags & GV_NOTQUAL) {
1057 /* Caller promised that there is no stash, so we can skip the check. */
1062 if (full_len > 2 && *name == '*' && isALPHA(name[1])) {
1063 /* accidental stringify on a GV? */
1067 for (name_cursor = name; name_cursor < name_end; name_cursor++) {
1068 if (name_cursor < name_em1 &&
1069 ((*name_cursor == ':'
1070 && name_cursor[1] == ':')
1071 || *name_cursor == '\''))
1074 stash = PL_defstash;
1075 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
1078 len = name_cursor - name;
1079 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1081 if (*name_cursor == ':') {
1086 Newx(tmpbuf, len+2, char);
1087 Copy(name, tmpbuf, len, char);
1088 tmpbuf[len++] = ':';
1089 tmpbuf[len++] = ':';
1092 gvp = (GV**)hv_fetch(stash, key, len, add);
1093 gv = gvp ? *gvp : NULL;
1094 if (gv && gv != (const GV *)&PL_sv_undef) {
1095 if (SvTYPE(gv) != SVt_PVGV)
1096 gv_init(gv, stash, key, len, (add & GV_ADDMULTI));
1102 if (!gv || gv == (const GV *)&PL_sv_undef)
1105 if (!(stash = GvHV(gv)))
1107 stash = GvHV(gv) = newHV();
1108 if (!HvNAME_get(stash)) {
1109 hv_name_set(stash, nambeg, name_cursor-nambeg, 0);
1110 /* If the containing stash has multiple effective
1111 names, see that this one gets them, too. */
1112 if (HvAUX(GvSTASH(gv))->xhv_name_count)
1113 mro_package_moved(stash, NULL, gv, 1);
1116 else if (!HvNAME_get(stash))
1117 hv_name_set(stash, nambeg, name_cursor - nambeg, 0);
1120 if (*name_cursor == ':')
1122 name = name_cursor+1;
1123 if (name == name_end)
1125 ? gv : MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1128 len = name_cursor - name;
1130 /* No stash in name, so see how we can default */
1134 if (len && isIDFIRST_lazy(name)) {
1135 bool global = FALSE;
1143 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1144 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1145 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
1149 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1154 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1155 && name[3] == 'I' && name[4] == 'N')
1159 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1160 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1161 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
1165 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1166 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1173 stash = PL_defstash;
1174 else if (IN_PERL_COMPILETIME) {
1175 stash = PL_curstash;
1176 if (add && (PL_hints & HINT_STRICT_VARS) &&
1177 sv_type != SVt_PVCV &&
1178 sv_type != SVt_PVGV &&
1179 sv_type != SVt_PVFM &&
1180 sv_type != SVt_PVIO &&
1181 !(len == 1 && sv_type == SVt_PV &&
1182 (*name == 'a' || *name == 'b')) )
1184 gvp = (GV**)hv_fetch(stash,name,len,0);
1186 *gvp == (const GV *)&PL_sv_undef ||
1187 SvTYPE(*gvp) != SVt_PVGV)
1191 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1192 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1193 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1195 /* diag_listed_as: Variable "%s" is not imported%s */
1197 aTHX_ packWARN(WARN_MISC),
1198 "Variable \"%c%s\" is not imported",
1199 sv_type == SVt_PVAV ? '@' :
1200 sv_type == SVt_PVHV ? '%' : '$',
1204 aTHX_ packWARN(WARN_MISC),
1205 "\t(Did you mean &%s instead?)\n", name
1212 stash = CopSTASH(PL_curcop);
1215 stash = PL_defstash;
1218 /* By this point we should have a stash and a name */
1222 SV * const err = Perl_mess(aTHX_
1223 "Global symbol \"%s%s\" requires explicit package name",
1224 (sv_type == SVt_PV ? "$"
1225 : sv_type == SVt_PVAV ? "@"
1226 : sv_type == SVt_PVHV ? "%"
1229 if (USE_UTF8_IN_NAMES)
1232 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1234 /* symbol table under destruction */
1243 if (!SvREFCNT(stash)) /* symbol table under destruction */
1246 gvp = (GV**)hv_fetch(stash,name,len,add);
1247 if (!gvp || *gvp == (const GV *)&PL_sv_undef)
1250 if (SvTYPE(gv) == SVt_PVGV) {
1253 gv_init_sv(gv, sv_type);
1254 if (len == 1 && stash == PL_defstash
1255 && (sv_type == SVt_PVHV || sv_type == SVt_PVGV)) {
1257 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1258 else if (*name == '-' || *name == '+')
1259 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
1261 else if (len == 3 && sv_type == SVt_PVAV
1262 && strnEQ(name, "ISA", 3)
1263 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
1264 gv_magicalize_isa(gv);
1267 } else if (no_init) {
1269 } else if (no_expand && SvROK(gv)) {
1273 /* Adding a new symbol.
1274 Unless of course there was already something non-GV here, in which case
1275 we want to behave as if there was always a GV here, containing some sort
1277 Otherwise we run the risk of creating things like GvIO, which can cause
1278 subtle bugs. eg the one that tripped up SQL::Translator */
1280 faking_it = SvOK(gv);
1282 if (add & GV_ADDWARN)
1283 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
1284 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
1285 gv_init_sv(gv, faking_it ? SVt_PVCV : sv_type);
1287 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
1288 : (PL_dowarn & G_WARN_ON ) ) )
1291 /* set up magic where warranted */
1292 if (stash != PL_defstash) { /* not the main stash */
1293 /* We only have to check for four names here: EXPORT, ISA, OVERLOAD
1294 and VERSION. All the others apply only to the main stash. */
1296 const char * const name2 = name + 1;
1299 if (strnEQ(name2, "XPORT", 5))
1303 if (strEQ(name2, "SA"))
1304 gv_magicalize_isa(gv);
1307 if (strEQ(name2, "VERLOAD"))
1308 gv_magicalize_overload(gv);
1311 if (strEQ(name2, "ERSION"))
1321 /* Nothing else to do.
1322 The compiler will probably turn the switch statement into a
1323 branch table. Make sure we avoid even that small overhead for
1324 the common case of lower case variable names. */
1328 const char * const name2 = name + 1;
1331 if (strEQ(name2, "RGV")) {
1332 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1334 else if (strEQ(name2, "RGVOUT")) {
1339 if (strnEQ(name2, "XPORT", 5))
1343 if (strEQ(name2, "SA")) {
1344 gv_magicalize_isa(gv);
1348 if (strEQ(name2, "VERLOAD")) {
1349 gv_magicalize_overload(gv);
1353 if (strEQ(name2, "IG")) {
1356 if (!PL_psig_name) {
1357 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
1358 Newxz(PL_psig_pend, SIG_SIZE, int);
1359 PL_psig_ptr = PL_psig_name + SIG_SIZE;
1361 /* I think that the only way to get here is to re-use an
1362 embedded perl interpreter, where the previous
1363 use didn't clean up fully because
1364 PL_perl_destruct_level was 0. I'm not sure that we
1365 "support" that, in that I suspect in that scenario
1366 there are sufficient other garbage values left in the
1367 interpreter structure that something else will crash
1368 before we get here. I suspect that this is one of
1369 those "doctor, it hurts when I do this" bugs. */
1370 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
1371 Zero(PL_psig_pend, SIG_SIZE, int);
1375 hv_magic(hv, NULL, PERL_MAGIC_sig);
1376 for (i = 1; i < SIG_SIZE; i++) {
1377 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1379 sv_setsv(*init, &PL_sv_undef);
1384 if (strEQ(name2, "ERSION"))
1387 case '\003': /* $^CHILD_ERROR_NATIVE */
1388 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1391 case '\005': /* $^ENCODING */
1392 if (strEQ(name2, "NCODING"))
1395 case '\007': /* $^GLOBAL_PHASE */
1396 if (strEQ(name2, "LOBAL_PHASE"))
1399 case '\015': /* $^MATCH */
1400 if (strEQ(name2, "ATCH"))
1402 case '\017': /* $^OPEN */
1403 if (strEQ(name2, "PEN"))
1406 case '\020': /* $^PREMATCH $^POSTMATCH */
1407 if (strEQ(name2, "REMATCH") || strEQ(name2, "OSTMATCH"))
1410 case '\024': /* ${^TAINT} */
1411 if (strEQ(name2, "AINT"))
1414 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1415 if (strEQ(name2, "NICODE"))
1417 if (strEQ(name2, "TF8LOCALE"))
1419 if (strEQ(name2, "TF8CACHE"))
1422 case '\027': /* $^WARNING_BITS */
1423 if (strEQ(name2, "ARNING_BITS"))
1436 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1438 /* This snippet is taken from is_gv_magical */
1439 const char *end = name + len;
1440 while (--end > name) {
1441 if (!isDIGIT(*end)) return gv;
1448 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1449 be case '\0' in this switch statement (ie a default case) */
1455 sv_type == SVt_PVAV ||
1456 sv_type == SVt_PVHV ||
1457 sv_type == SVt_PVCV ||
1458 sv_type == SVt_PVFM ||
1461 PL_sawampersand = TRUE;
1465 sv_setpv(GvSVn(gv),PL_chopset);
1469 #ifdef COMPLEX_STATUS
1470 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1476 /* If %! has been used, automatically load Errno.pm. */
1478 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1480 /* magicalization must be done before require_tie_mod is called */
1481 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1482 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1487 GvMULTI_on(gv); /* no used once warnings here */
1489 AV* const av = GvAVn(gv);
1490 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
1492 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
1493 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1495 SvREADONLY_on(GvSVn(gv));
1498 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1499 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
1505 if (sv_type == SVt_PV)
1506 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1507 "$%c is no longer supported", *name);
1510 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1513 case '\010': /* $^H */
1515 HV *const hv = GvHVn(gv);
1516 hv_magic(hv, NULL, PERL_MAGIC_hints);
1519 case '\023': /* $^S */
1521 SvREADONLY_on(GvSVn(gv));
1546 case '\001': /* $^A */
1547 case '\003': /* $^C */
1548 case '\004': /* $^D */
1549 case '\005': /* $^E */
1550 case '\006': /* $^F */
1551 case '\011': /* $^I, NOT \t in EBCDIC */
1552 case '\016': /* $^N */
1553 case '\017': /* $^O */
1554 case '\020': /* $^P */
1555 case '\024': /* $^T */
1556 case '\027': /* $^W */
1558 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1561 case '\014': /* $^L */
1562 sv_setpvs(GvSVn(gv),"\f");
1563 PL_formfeed = GvSVn(gv);
1566 sv_setpvs(GvSVn(gv),"\034");
1570 SV * const sv = GvSVn(gv);
1571 if (!sv_derived_from(PL_patchlevel, "version"))
1572 upg_version(PL_patchlevel, TRUE);
1573 GvSV(gv) = vnumify(PL_patchlevel);
1574 SvREADONLY_on(GvSV(gv));
1578 case '\026': /* $^V */
1580 SV * const sv = GvSVn(gv);
1581 GvSV(gv) = new_version(PL_patchlevel);
1582 SvREADONLY_on(GvSV(gv));
1592 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1596 const HV * const hv = GvSTASH(gv);
1598 PERL_ARGS_ASSERT_GV_FULLNAME4;
1604 sv_setpv(sv, prefix ? prefix : "");
1606 name = HvNAME_get(hv);
1608 namelen = HvNAMELEN_get(hv);
1614 if (keepmain || strNE(name, "main")) {
1615 sv_catpvn(sv,name,namelen);
1618 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1622 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1624 const GV * const egv = GvEGVx(gv);
1626 PERL_ARGS_ASSERT_GV_EFULLNAME4;
1628 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1632 Perl_gv_check(pTHX_ const HV *stash)
1637 PERL_ARGS_ASSERT_GV_CHECK;
1639 if (!HvARRAY(stash))
1641 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1643 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1646 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1647 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
1649 if (hv != PL_defstash && hv != stash)
1650 gv_check(hv); /* nested package */
1652 else if (isALPHA(*HeKEY(entry))) {
1654 gv = MUTABLE_GV(HeVAL(entry));
1655 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1658 CopLINE_set(PL_curcop, GvLINE(gv));
1660 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1662 CopFILEGV(PL_curcop)
1663 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
1665 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1666 "Name \"%s::%s\" used only once: possible typo",
1667 HvNAME_get(stash), GvNAME(gv));
1674 Perl_newGVgen(pTHX_ const char *pack)
1678 PERL_ARGS_ASSERT_NEWGVGEN;
1680 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1684 /* hopefully this is only called on local symbol table entries */
1687 Perl_gp_ref(pTHX_ GP *gp)
1695 /* If the GP they asked for a reference to contains
1696 a method cache entry, clear it first, so that we
1697 don't infect them with our cached entry */
1698 SvREFCNT_dec(gp->gp_cv);
1707 Perl_gp_free(pTHX_ GV *gv)
1713 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
1715 if (gp->gp_refcnt == 0) {
1716 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
1717 "Attempt to free unreferenced glob pointers"
1718 pTHX__FORMAT pTHX__VALUE);
1721 if (--gp->gp_refcnt > 0) {
1722 if (gp->gp_egv == gv)
1729 /* Copy and null out all the glob slots, so destructors do not see
1731 HEK * const file_hek = gp->gp_file_hek;
1732 SV * const sv = gp->gp_sv;
1733 AV * const av = gp->gp_av;
1734 HV * const hv = gp->gp_hv;
1735 IO * const io = gp->gp_io;
1736 CV * const cv = gp->gp_cv;
1737 CV * const form = gp->gp_form;
1739 gp->gp_file_hek = NULL;
1748 unshare_hek(file_hek);
1752 /* FIXME - another reference loop GV -> symtab -> GV ?
1753 Somehow gp->gp_hv can end up pointing at freed garbage. */
1754 if (hv && SvTYPE(hv) == SVt_PVHV) {
1755 const char *hvname = HvNAME_get(hv);
1756 if (PL_stashcache && hvname)
1757 (void)hv_delete(PL_stashcache, hvname, HvNAMELEN_get(hv),
1765 if (!gp->gp_file_hek
1771 && !gp->gp_form) break;
1773 if (--attempts == 0) {
1775 "panic: gp_free failed to free glob pointer - "
1776 "something is repeatedly re-creating entries"
1786 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1788 AMT * const amtp = (AMT*)mg->mg_ptr;
1789 PERL_UNUSED_ARG(sv);
1791 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
1793 if (amtp && AMT_AMAGIC(amtp)) {
1795 for (i = 1; i < NofAMmeth; i++) {
1796 CV * const cv = amtp->table[i];
1798 SvREFCNT_dec(MUTABLE_SV(cv));
1799 amtp->table[i] = NULL;
1806 /* Updates and caches the CV's */
1808 * 1 on success and there is some overload
1809 * 0 if there is no overload
1810 * -1 if some error occurred and it couldn't croak
1814 Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
1817 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
1819 const struct mro_meta* stash_meta = HvMROMETA(stash);
1822 PERL_ARGS_ASSERT_GV_AMUPDATE;
1824 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
1826 const AMT * const amtp = (AMT*)mg->mg_ptr;
1827 if (amtp->was_ok_am == PL_amagic_generation
1828 && amtp->was_ok_sub == newgen) {
1829 return AMT_OVERLOADED(amtp) ? 1 : 0;
1831 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
1834 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1837 amt.was_ok_am = PL_amagic_generation;
1838 amt.was_ok_sub = newgen;
1839 amt.fallback = AMGfallNO;
1843 int filled = 0, have_ovl = 0;
1846 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1848 /* Try to find via inheritance. */
1849 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1850 SV * const sv = gv ? GvSV(gv) : NULL;
1854 lim = DESTROY_amg; /* Skip overloading entries. */
1855 #ifdef PERL_DONT_CREATE_GVSV
1857 NOOP; /* Equivalent to !SvTRUE and !SvOK */
1860 else if (SvTRUE(sv))
1861 amt.fallback=AMGfallYES;
1863 amt.fallback=AMGfallNEVER;
1865 for (i = 1; i < lim; i++)
1866 amt.table[i] = NULL;
1867 for (; i < NofAMmeth; i++) {
1868 const char * const cooky = PL_AMG_names[i];
1869 /* Human-readable form, for debugging: */
1870 const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1871 const STRLEN l = PL_AMG_namelens[i];
1873 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1874 cp, HvNAME_get(stash)) );
1875 /* don't fill the cache while looking up!
1876 Creation of inheritance stubs in intermediate packages may
1877 conflict with the logic of runtime method substitution.
1878 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1879 then we could have created stubs for "(+0" in A and C too.
1880 But if B overloads "bool", we may want to use it for
1881 numifying instead of C's "+0". */
1882 if (i >= DESTROY_amg)
1883 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1884 else /* Autoload taken care of below */
1885 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1887 if (gv && (cv = GvCV(gv))) {
1889 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1890 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1891 /* This is a hack to support autoloading..., while
1892 knowing *which* methods were declared as overloaded. */
1893 /* GvSV contains the name of the method. */
1895 SV *gvsv = GvSV(gv);
1897 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1898 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1899 (void*)GvSV(gv), cp, hvname) );
1900 if (!gvsv || !SvPOK(gvsv)
1901 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1904 /* Can be an import stub (created by "can"). */
1909 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1910 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1911 "in package \"%.256s\"",
1912 (GvCVGEN(gv) ? "Stub found while resolving"
1917 cv = GvCV(gv = ngv);
1919 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1920 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1921 GvNAME(CvGV(cv))) );
1923 if (i < DESTROY_amg)
1925 } else if (gv) { /* Autoloaded... */
1926 cv = MUTABLE_CV(gv);
1929 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
1932 AMT_AMAGIC_on(&amt);
1934 AMT_OVERLOADED_on(&amt);
1935 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
1936 (char*)&amt, sizeof(AMT));
1940 /* Here we have no table: */
1942 AMT_AMAGIC_off(&amt);
1943 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
1944 (char*)&amt, sizeof(AMTS));
1950 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1956 struct mro_meta* stash_meta;
1958 if (!stash || !HvNAME_get(stash))
1961 stash_meta = HvMROMETA(stash);
1962 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
1964 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
1967 /* If we're looking up a destructor to invoke, we must avoid
1968 * that Gv_AMupdate croaks, because we might be dying already */
1969 if (Gv_AMupdate(stash, cBOOL(id == DESTROY_amg)) == -1) {
1970 /* and if it didn't found a destructor, we fall back
1971 * to a simpler method that will only look for the
1972 * destructor instead of the whole magic */
1973 if (id == DESTROY_amg) {
1974 GV * const gv = gv_fetchmethod(stash, "DESTROY");
1980 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
1983 amtp = (AMT*)mg->mg_ptr;
1984 if ( amtp->was_ok_am != PL_amagic_generation
1985 || amtp->was_ok_sub != newgen )
1987 if (AMT_AMAGIC(amtp)) {
1988 CV * const ret = amtp->table[id];
1989 if (ret && isGV(ret)) { /* Autoloading stab */
1990 /* Passing it through may have resulted in a warning
1991 "Inherited AUTOLOAD for a non-method deprecated", since
1992 our caller is going through a function call, not a method call.
1993 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1994 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
2006 /* Implement tryAMAGICun_MG macro.
2007 Do get magic, then see if the stack arg is overloaded and if so call it.
2009 AMGf_set return the arg using SETs rather than assigning to
2011 AMGf_numeric apply sv_2num to the stack arg.
2015 Perl_try_amagic_un(pTHX_ int method, int flags) {
2019 SV* const arg = TOPs;
2023 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2024 AMGf_noright | AMGf_unary))) {
2025 if (flags & AMGf_set) {
2030 if (SvPADMY(TARG)) {
2031 sv_setsv(TARG, tmpsv);
2041 if ((flags & AMGf_numeric) && SvROK(arg))
2047 /* Implement tryAMAGICbin_MG macro.
2048 Do get magic, then see if the two stack args are overloaded and if so
2051 AMGf_set return the arg using SETs rather than assigning to
2053 AMGf_assign op may be called as mutator (eg +=)
2054 AMGf_numeric apply sv_2num to the stack arg.
2058 Perl_try_amagic_bin(pTHX_ int method, int flags) {
2061 SV* const left = TOPm1s;
2062 SV* const right = TOPs;
2068 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2069 SV * const tmpsv = amagic_call(left, right, method,
2070 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2072 if (flags & AMGf_set) {
2079 if (opASSIGN || SvPADMY(TARG)) {
2080 sv_setsv(TARG, tmpsv);
2090 if(left==right && SvGMAGICAL(left)) {
2091 SV * const left = sv_newmortal();
2093 /* Print the uninitialized warning now, so it includes the vari-
2096 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2097 sv_setsv_flags(left, &PL_sv_no, 0);
2099 else sv_setsv_flags(left, right, 0);
2102 if (flags & AMGf_numeric) {
2104 *(sp-1) = sv_2num(TOPm1s);
2106 *sp = sv_2num(right);
2112 Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2115 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2117 while (SvAMAGIC(ref) &&
2118 (tmpsv = amagic_call(ref, &PL_sv_undef, method,
2119 AMGf_noright | AMGf_unary))) {
2121 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2122 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2123 /* Bail out if it returns us the same reference. */
2128 return tmpsv ? tmpsv : ref;
2132 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
2137 CV **cvp=NULL, **ocvp=NULL;
2138 AMT *amtp=NULL, *oamtp=NULL;
2139 int off = 0, off1, lr = 0, notfound = 0;
2140 int postpr = 0, force_cpy = 0;
2141 int assign = AMGf_assign & flags;
2142 const int assignshift = assign ? 1 : 0;
2143 int use_default_op = 0;
2149 PERL_ARGS_ASSERT_AMAGIC_CALL;
2151 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
2152 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2154 if ( !lex_mask || !SvOK(lex_mask) )
2155 /* overloading lexically disabled */
2157 else if ( lex_mask && SvPOK(lex_mask) ) {
2158 /* we have an entry in the hints hash, check if method has been
2159 * masked by overloading.pm */
2161 const int offset = method / 8;
2162 const int bit = method % 8;
2163 char *pv = SvPV(lex_mask, len);
2165 /* Bit set, so this overloading operator is disabled */
2166 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2171 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
2172 && (stash = SvSTASH(SvRV(left)))
2173 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
2174 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
2175 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
2177 && ((cv = cvp[off=method+assignshift])
2178 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2184 cv = cvp[off=method])))) {
2185 lr = -1; /* Call method for left argument */
2187 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2190 /* look for substituted methods */
2191 /* In all the covered cases we should be called with assign==0. */
2195 if ((cv = cvp[off=add_ass_amg])
2196 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
2197 right = &PL_sv_yes; lr = -1; assign = 1;
2202 if ((cv = cvp[off = subtr_ass_amg])
2203 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
2204 right = &PL_sv_yes; lr = -1; assign = 1;
2208 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
2211 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
2214 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
2217 (void)((cv = cvp[off=bool__amg])
2218 || (cv = cvp[off=numer_amg])
2219 || (cv = cvp[off=string_amg]));
2226 * SV* ref causes confusion with the interpreter variable of
2229 SV* const tmpRef=SvRV(left);
2230 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
2232 * Just to be extra cautious. Maybe in some
2233 * additional cases sv_setsv is safe, too.
2235 SV* const newref = newSVsv(tmpRef);
2236 SvOBJECT_on(newref);
2237 /* As a bit of a source compatibility hack, SvAMAGIC() and
2238 friends dereference an RV, to behave the same was as when
2239 overloading was stored on the reference, not the referant.
2240 Hence we can't use SvAMAGIC_on()
2242 SvFLAGS(newref) |= SVf_AMAGIC;
2243 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
2249 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
2250 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
2251 SV* const nullsv=sv_2mortal(newSViv(0));
2253 SV* const lessp = amagic_call(left,nullsv,
2254 lt_amg,AMGf_noright);
2255 logic = SvTRUE(lessp);
2257 SV* const lessp = amagic_call(left,nullsv,
2258 ncmp_amg,AMGf_noright);
2259 logic = (SvNV(lessp) < 0);
2262 if (off==subtr_amg) {
2273 if ((cv = cvp[off=subtr_amg])) {
2275 left = sv_2mortal(newSViv(0));
2280 case iter_amg: /* XXXX Eventually should do to_gv. */
2281 case ftest_amg: /* XXXX Eventually should do to_gv. */
2284 return NULL; /* Delegate operation to standard mechanisms. */
2292 return left; /* Delegate operation to standard mechanisms. */
2297 if (!cv) goto not_found;
2298 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
2299 && (stash = SvSTASH(SvRV(right)))
2300 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
2301 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
2302 ? (amtp = (AMT*)mg->mg_ptr)->table
2304 && (cv = cvp[off=method])) { /* Method for right
2307 } else if (((cvp && amtp->fallback > AMGfallNEVER)
2308 || (ocvp && oamtp->fallback > AMGfallNEVER))
2309 && !(flags & AMGf_unary)) {
2310 /* We look for substitution for
2311 * comparison operations and
2313 if (method==concat_amg || method==concat_ass_amg
2314 || method==repeat_amg || method==repeat_ass_amg) {
2315 return NULL; /* Delegate operation to string conversion */
2337 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
2341 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
2351 not_found: /* No method found, either report or croak */
2359 return left; /* Delegate operation to standard mechanisms. */
2362 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
2363 notfound = 1; lr = -1;
2364 } else if (cvp && (cv=cvp[nomethod_amg])) {
2365 notfound = 1; lr = 1;
2366 } else if ((use_default_op =
2367 (!ocvp || oamtp->fallback >= AMGfallYES)
2368 && (!cvp || amtp->fallback >= AMGfallYES))
2370 /* Skip generating the "no method found" message. */
2374 if (off==-1) off=method;
2375 msg = sv_2mortal(Perl_newSVpvf(aTHX_
2376 "Operation \"%s\": no method found,%sargument %s%s%s%s",
2377 AMG_id2name(method + assignshift),
2378 (flags & AMGf_unary ? " " : "\n\tleft "),
2380 "in overloaded package ":
2381 "has no overloaded magic",
2383 HvNAME_get(SvSTASH(SvRV(left))):
2386 ",\n\tright argument in overloaded package ":
2389 : ",\n\tright argument has no overloaded magic"),
2391 HvNAME_get(SvSTASH(SvRV(right))):
2393 if (use_default_op) {
2394 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
2396 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
2400 force_cpy = force_cpy || assign;
2405 DEBUG_o(Perl_deb(aTHX_
2406 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
2408 method+assignshift==off? "" :
2410 method+assignshift==off? "" :
2411 AMG_id2name(method+assignshift),
2412 method+assignshift==off? "" : "\")",
2413 flags & AMGf_unary? "" :
2414 lr==1 ? " for right argument": " for left argument",
2415 flags & AMGf_unary? " for argument" : "",
2416 stash ? HvNAME_get(stash) : "null",
2417 fl? ",\n\tassignment variant used": "") );
2420 /* Since we use shallow copy during assignment, we need
2421 * to dublicate the contents, probably calling user-supplied
2422 * version of copy operator
2424 /* We need to copy in following cases:
2425 * a) Assignment form was called.
2426 * assignshift==1, assign==T, method + 1 == off
2427 * b) Increment or decrement, called directly.
2428 * assignshift==0, assign==0, method + 0 == off
2429 * c) Increment or decrement, translated to assignment add/subtr.
2430 * assignshift==0, assign==T,
2432 * d) Increment or decrement, translated to nomethod.
2433 * assignshift==0, assign==0,
2435 * e) Assignment form translated to nomethod.
2436 * assignshift==1, assign==T, method + 1 != off
2439 /* off is method, method+assignshift, or a result of opcode substitution.
2440 * In the latter case assignshift==0, so only notfound case is important.
2442 if (( (method + assignshift == off)
2443 && (assign || (method == inc_amg) || (method == dec_amg)))
2446 /* newSVsv does not behave as advertised, so we copy missing
2447 * information by hand */
2448 SV *tmpRef = SvRV(left);
2450 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
2451 SvRV_set(left, rv_copy);
2453 SvREFCNT_dec(tmpRef);
2461 const bool oldcatch = CATCH_GET;
2464 Zero(&myop, 1, BINOP);
2465 myop.op_last = (OP *) &myop;
2466 myop.op_next = NULL;
2467 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
2469 PUSHSTACKi(PERLSI_OVERLOAD);
2472 PL_op = (OP *) &myop;
2473 if (PERLDB_SUB && PL_curstash != PL_debstash)
2474 PL_op->op_private |= OPpENTERSUB_DB;
2476 Perl_pp_pushmark(aTHX);
2478 EXTEND(SP, notfound + 5);
2479 PUSHs(lr>0? right: left);
2480 PUSHs(lr>0? left: right);
2481 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
2483 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
2484 AMG_id2namelen(method + assignshift), SVs_TEMP));
2486 PUSHs(MUTABLE_SV(cv));
2489 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
2497 CATCH_SET(oldcatch);
2504 ans=SvIV(res)<=0; break;
2507 ans=SvIV(res)<0; break;
2510 ans=SvIV(res)>=0; break;
2513 ans=SvIV(res)>0; break;
2516 ans=SvIV(res)==0; break;
2519 ans=SvIV(res)!=0; break;
2522 SvSetSV(left,res); return left;
2524 ans=!SvTRUE(res); break;
2529 } else if (method==copy_amg) {
2531 Perl_croak(aTHX_ "Copy method did not return a reference");
2533 return SvREFCNT_inc(SvRV(res));
2541 =for apidoc is_gv_magical_sv
2543 Returns C<TRUE> if given the name of a magical GV.
2545 Currently only useful internally when determining if a GV should be
2546 created even in rvalue contexts.
2548 C<flags> is not used at present but available for future extension to
2549 allow selecting particular classes of magical variable.
2551 Currently assumes that C<name> is NUL terminated (as well as len being valid).
2552 This assumption is met by all callers within the perl core, which all pass
2553 pointers returned by SvPV.
2559 Perl_is_gv_magical_sv(pTHX_ SV *const name_sv, U32 flags)
2562 const char *const name = SvPV_const(name_sv, len);
2564 PERL_UNUSED_ARG(flags);
2565 PERL_ARGS_ASSERT_IS_GV_MAGICAL_SV;
2568 const char * const name1 = name + 1;
2571 if (len == 3 && name[1] == 'S' && name[2] == 'A')
2575 if (len == 8 && strEQ(name1, "VERLOAD"))
2579 if (len == 3 && name[1] == 'I' && name[2] == 'G')
2582 /* Using ${^...} variables is likely to be sufficiently rare that
2583 it seems sensible to avoid the space hit of also checking the
2585 case '\017': /* ${^OPEN} */
2586 if (strEQ(name1, "PEN"))
2589 case '\024': /* ${^TAINT} */
2590 if (strEQ(name1, "AINT"))
2593 case '\025': /* ${^UNICODE} */
2594 if (strEQ(name1, "NICODE"))
2596 if (strEQ(name1, "TF8LOCALE"))
2599 case '\027': /* ${^WARNING_BITS} */
2600 if (strEQ(name1, "ARNING_BITS"))
2613 const char *end = name + len;
2614 while (--end > name) {
2622 /* Because we're already assuming that name is NUL terminated
2623 below, we can treat an empty name as "\0" */
2649 case '\001': /* $^A */
2650 case '\003': /* $^C */
2651 case '\004': /* $^D */
2652 case '\005': /* $^E */
2653 case '\006': /* $^F */
2654 case '\010': /* $^H */
2655 case '\011': /* $^I, NOT \t in EBCDIC */
2656 case '\014': /* $^L */
2657 case '\016': /* $^N */
2658 case '\017': /* $^O */
2659 case '\020': /* $^P */
2660 case '\023': /* $^S */
2661 case '\024': /* $^T */
2662 case '\026': /* $^V */
2663 case '\027': /* $^W */
2683 Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
2688 PERL_ARGS_ASSERT_GV_NAME_SET;
2689 PERL_UNUSED_ARG(flags);
2692 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
2694 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
2695 unshare_hek(GvNAME_HEK(gv));
2698 PERL_HASH(hash, name, len);
2699 GvNAME_HEK(gv) = share_hek(name, len, hash);
2703 =for apidoc gv_try_downgrade
2705 If the typeglob C<gv> can be expressed more succinctly, by having
2706 something other than a real GV in its place in the stash, replace it
2707 with the optimised form. Basic requirements for this are that C<gv>
2708 is a real typeglob, is sufficiently ordinary, and is only referenced
2709 from its package. This function is meant to be used when a GV has been
2710 looked up in part to see what was there, causing upgrading, but based
2711 on what was found it turns out that the real GV isn't required after all.
2713 If C<gv> is a completely empty typeglob, it is deleted from the stash.
2715 If C<gv> is a typeglob containing only a sufficiently-ordinary constant
2716 sub, the typeglob is replaced with a scalar-reference placeholder that
2717 more compactly represents the same thing.
2723 Perl_gv_try_downgrade(pTHX_ GV *gv)
2729 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
2731 /* XXX Why and where does this leave dangling pointers during global
2733 if (PL_phase == PERL_PHASE_DESTRUCT) return;
2735 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
2736 !SvOBJECT(gv) && !SvREADONLY(gv) &&
2737 isGV_with_GP(gv) && GvGP(gv) &&
2738 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
2739 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
2740 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2742 if (SvMAGICAL(gv)) {
2744 /* only backref magic is allowed */
2745 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
2747 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
2748 if (mg->mg_type != PERL_MAGIC_backref)
2754 HEK *gvnhek = GvNAME_HEK(gv);
2755 (void)hv_delete(stash, HEK_KEY(gvnhek),
2756 HEK_UTF8(gvnhek) ? -HEK_LEN(gvnhek) : HEK_LEN(gvnhek), G_DISCARD);
2757 } else if (GvMULTI(gv) && cv &&
2758 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
2759 CvSTASH(cv) == stash && CvGV(cv) == gv &&
2760 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
2761 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
2762 (namehek = GvNAME_HEK(gv)) &&
2763 (gvp = hv_fetch(stash, HEK_KEY(namehek),
2764 HEK_LEN(namehek)*(HEK_UTF8(namehek) ? -1 : 1), 0)) &&
2766 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
2770 SvFLAGS(gv) = SVt_IV|SVf_ROK;
2771 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
2772 STRUCT_OFFSET(XPVIV, xiv_iv));
2773 SvRV_set(gv, value);
2779 * c-indentation-style: bsd
2781 * indent-tabs-mode: t
2784 * ex: set ts=8 sts=4 sw=4 noet: