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;
417 I32 create = (level >= 0) ? 1 : 0;
422 PERL_ARGS_ASSERT_GV_FETCHMETH;
424 /* UNIVERSAL methods should be callable without a stash */
426 create = 0; /* probably appropriate */
427 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
433 hvname = HvNAME_get(stash);
435 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
440 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
442 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
444 /* check locally for a real method or a cache entry */
445 gvp = (GV**)hv_fetch(stash, name, len, create);
449 if (SvTYPE(topgv) != SVt_PVGV)
450 gv_init(topgv, stash, name, len, TRUE);
451 if ((cand_cv = GvCV(topgv))) {
452 /* If genuine method or valid cache entry, use it */
453 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
457 /* stale cache entry, junk it and move on */
458 SvREFCNT_dec(cand_cv);
459 GvCV_set(topgv, NULL);
464 else if (GvCVGEN(topgv) == topgen_cmp) {
465 /* cache indicates no such method definitively */
470 packlen = HvNAMELEN_get(stash);
471 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
474 basestash = gv_stashpvn(hvname, packlen, GV_ADD);
475 linear_av = mro_get_linear_isa(basestash);
478 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
481 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
482 items = AvFILLp(linear_av); /* no +1, to skip over self */
484 linear_sv = *linear_svp++;
486 cstash = gv_stashsv(linear_sv, 0);
489 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX), "Can't locate package %"SVf" for @%s::ISA",
490 SVfARG(linear_sv), hvname);
496 gvp = (GV**)hv_fetch(cstash, name, len, 0);
500 if (SvTYPE(candidate) != SVt_PVGV) gv_init(candidate, cstash, name, len, TRUE);
501 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
503 * Found real method, cache method in topgv if:
504 * 1. topgv has no synonyms (else inheritance crosses wires)
505 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
507 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
508 if ((old_cv = GvCV(topgv))) 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 if ((old_cv = GvCV(topgv))) SvREFCNT_dec(old_cv);
524 SvREFCNT_inc_simple_void_NN(cand_cv);
525 GvCV_set(topgv, cand_cv);
526 GvCVGEN(topgv) = topgen_cmp;
532 if (topgv && GvREFCNT(topgv) == 1) {
533 /* cache the fact that the method is not defined */
534 GvCVGEN(topgv) = topgen_cmp;
541 =for apidoc gv_fetchmeth_autoload
543 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
544 Returns a glob for the subroutine.
546 For an autoloaded subroutine without a GV, will create a GV even
547 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
548 of the result may be zero.
554 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
556 GV *gv = gv_fetchmeth(stash, name, len, level);
558 PERL_ARGS_ASSERT_GV_FETCHMETH_AUTOLOAD;
565 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
566 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
568 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
571 if (!(CvROOT(cv) || CvXSUB(cv)))
573 /* Have an autoload */
574 if (level < 0) /* Cannot do without a stub */
575 gv_fetchmeth(stash, name, len, 0);
576 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
585 =for apidoc gv_fetchmethod_autoload
587 Returns the glob which contains the subroutine to call to invoke the method
588 on the C<stash>. In fact in the presence of autoloading this may be the
589 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
592 The third parameter of C<gv_fetchmethod_autoload> determines whether
593 AUTOLOAD lookup is performed if the given method is not present: non-zero
594 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
595 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
596 with a non-zero C<autoload> parameter.
598 These functions grant C<"SUPER"> token as a prefix of the method name. Note
599 that if you want to keep the returned glob for a long time, you need to
600 check for it being "AUTOLOAD", since at the later time the call may load a
601 different subroutine due to $AUTOLOAD changing its value. Use the glob
602 created via a side effect to do this.
604 These functions have the same side-effects and as C<gv_fetchmeth> with
605 C<level==0>. C<name> should be writable if contains C<':'> or C<'
606 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
607 C<call_sv> apply equally to these functions.
613 S_gv_get_super_pkg(pTHX_ const char* name, I32 namelen)
620 PERL_ARGS_ASSERT_GV_GET_SUPER_PKG;
622 stash = gv_stashpvn(name, namelen, 0);
623 if(stash) return stash;
625 /* If we must create it, give it an @ISA array containing
626 the real package this SUPER is for, so that it's tied
627 into the cache invalidation code correctly */
628 stash = gv_stashpvn(name, namelen, GV_ADD);
629 gvp = (GV**)hv_fetchs(stash, "ISA", TRUE);
631 gv_init(gv, stash, "ISA", 3, TRUE);
632 superisa = GvAVn(gv);
634 sv_magic(MUTABLE_SV(superisa), MUTABLE_SV(gv), PERL_MAGIC_isa, NULL, 0);
636 av_push(superisa, newSVpv(CopSTASHPV(PL_curcop), 0));
638 av_push(superisa, newSVhek(CopSTASH(PL_curcop)
639 ? HvNAME_HEK(CopSTASH(PL_curcop)) : NULL));
646 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
648 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
650 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
653 /* Don't merge this yet, as it's likely to get a len parameter, and possibly
656 Perl_gv_fetchmethod_flags(pTHX_ HV *stash, const char *name, U32 flags)
659 register const char *nend;
660 const char *nsplit = NULL;
663 const char * const origname = name;
664 SV *const error_report = MUTABLE_SV(stash);
665 const U32 autoload = flags & GV_AUTOLOAD;
666 const U32 do_croak = flags & GV_CROAK;
668 PERL_ARGS_ASSERT_GV_FETCHMETHOD_FLAGS;
670 if (SvTYPE(stash) < SVt_PVHV)
673 /* The only way stash can become NULL later on is if nsplit is set,
674 which in turn means that there is no need for a SVt_PVHV case
675 the error reporting code. */
678 for (nend = name; *nend; nend++) {
683 else if (*nend == ':' && *(nend + 1) == ':') {
689 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
690 /* ->SUPER::method should really be looked up in original stash */
691 SV * const tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
692 CopSTASHPV(PL_curcop)));
693 /* __PACKAGE__::SUPER stash should be autovivified */
694 stash = gv_get_super_pkg(SvPVX_const(tmpstr), SvCUR(tmpstr));
695 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
696 origname, HvNAME_get(stash), name) );
699 /* don't autovifify if ->NoSuchStash::method */
700 stash = gv_stashpvn(origname, nsplit - origname, 0);
702 /* however, explicit calls to Pkg::SUPER::method may
703 happen, and may require autovivification to work */
704 if (!stash && (nsplit - origname) >= 7 &&
705 strnEQ(nsplit - 7, "::SUPER", 7) &&
706 gv_stashpvn(origname, nsplit - origname - 7, 0))
707 stash = gv_get_super_pkg(origname, nsplit - origname);
712 gv = gv_fetchmeth(stash, name, nend - name, 0);
714 if (strEQ(name,"import") || strEQ(name,"unimport"))
715 gv = MUTABLE_GV(&PL_sv_yes);
717 gv = gv_autoload4(ostash, name, nend - name, TRUE);
718 if (!gv && do_croak) {
719 /* Right now this is exclusively for the benefit of S_method_common
722 /* If we can't find an IO::File method, it might be a call on
723 * a filehandle. If IO:File has not been loaded, try to
724 * require it first instead of croaking */
725 const char *stash_name = HvNAME_get(stash);
726 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
727 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
728 STR_WITH_LEN("IO/File.pm"), 0,
729 HV_FETCH_ISEXISTS, NULL, 0)
731 require_pv("IO/File.pm");
732 gv = gv_fetchmeth(stash, name, nend - name, 0);
737 "Can't locate object method \"%s\" via package \"%.*s\"",
738 name, (int)HvNAMELEN_get(stash), HvNAME_get(stash));
742 const char *packname;
745 packlen = nsplit - origname;
748 packname = SvPV_const(error_report, packlen);
752 "Can't locate object method \"%s\" via package \"%.*s\""
753 " (perhaps you forgot to load \"%.*s\"?)",
754 name, (int)packlen, packname, (int)packlen, packname);
759 CV* const cv = GvCV(gv);
760 if (!CvROOT(cv) && !CvXSUB(cv)) {
768 if (GvCV(stubgv) != cv) /* orphaned import */
771 autogv = gv_autoload4(GvSTASH(stubgv),
772 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
782 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
790 const char *packname = "";
791 STRLEN packname_len = 0;
793 PERL_ARGS_ASSERT_GV_AUTOLOAD4;
795 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
798 if (SvTYPE(stash) < SVt_PVHV) {
799 packname = SvPV_const(MUTABLE_SV(stash), packname_len);
803 packname = HvNAME_get(stash);
804 packname_len = HvNAMELEN_get(stash);
807 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
811 if (!(CvROOT(cv) || CvXSUB(cv)))
815 * Inheriting AUTOLOAD for non-methods works ... for now.
817 if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
819 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
820 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
821 packname, (int)len, name);
824 /* rather than lookup/init $AUTOLOAD here
825 * only to have the XSUB do another lookup for $AUTOLOAD
826 * and split that value on the last '::',
827 * pass along the same data via some unused fields in the CV
829 CvSTASH_set(cv, stash);
830 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
836 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
837 * The subroutine's original name may not be "AUTOLOAD", so we don't
838 * use that, but for lack of anything better we will use the sub's
839 * original package to look up $AUTOLOAD.
841 varstash = GvSTASH(CvGV(cv));
842 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
846 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
847 #ifdef PERL_DONT_CREATE_GVSV
848 GvSV(vargv) = newSV(0);
852 varsv = GvSVn(vargv);
853 sv_setpvn(varsv, packname, packname_len);
854 sv_catpvs(varsv, "::");
855 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
856 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
857 sv_catpvn_mg(varsv, name, len);
862 /* require_tie_mod() internal routine for requiring a module
863 * that implements the logic of automatic ties like %! and %-
865 * The "gv" parameter should be the glob.
866 * "varpv" holds the name of the var, used for error messages.
867 * "namesv" holds the module name. Its refcount will be decremented.
868 * "methpv" holds the method name to test for to check that things
869 * are working reasonably close to as expected.
870 * "flags": if flag & 1 then save the scalar before loading.
871 * For the protection of $! to work (it is set by this routine)
872 * the sv slot must already be magicalized.
875 S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
878 HV* stash = gv_stashsv(namesv, 0);
880 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
882 if (!stash || !(gv_fetchmethod(stash, methpv))) {
883 SV *module = newSVsv(namesv);
884 char varname = *varpv; /* varpv might be clobbered by load_module,
885 so save it. For the moment it's always
891 PUSHSTACKi(PERLSI_MAGIC);
892 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
896 stash = gv_stashsv(namesv, 0);
898 Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" is not available",
899 varname, SVfARG(namesv));
900 else if (!gv_fetchmethod(stash, methpv))
901 Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" does not support method %s",
902 varname, SVfARG(namesv), methpv);
904 SvREFCNT_dec(namesv);
909 =for apidoc gv_stashpv
911 Returns a pointer to the stash for a specified package. Uses C<strlen> to
912 determine the length of C<name>, then calls C<gv_stashpvn()>.
918 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
920 PERL_ARGS_ASSERT_GV_STASHPV;
921 return gv_stashpvn(name, strlen(name), create);
925 =for apidoc gv_stashpvn
927 Returns a pointer to the stash for a specified package. The C<namelen>
928 parameter indicates the length of the C<name>, in bytes. C<flags> is passed
929 to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
930 created if it does not already exist. If the package does not exist and
931 C<flags> is 0 (or any other setting that does not create packages) then NULL
939 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
945 U32 tmplen = namelen + 2;
947 PERL_ARGS_ASSERT_GV_STASHPVN;
949 if (tmplen <= sizeof smallbuf)
952 Newx(tmpbuf, tmplen, char);
953 Copy(name, tmpbuf, namelen, char);
954 tmpbuf[namelen] = ':';
955 tmpbuf[namelen+1] = ':';
956 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
957 if (tmpbuf != smallbuf)
962 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
964 if (!HvNAME_get(stash)) {
965 hv_name_set(stash, name, namelen, 0);
967 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
968 /* If the containing stash has multiple effective
969 names, see that this one gets them, too. */
970 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
971 mro_package_moved(stash, NULL, tmpgv, 1);
977 =for apidoc gv_stashsv
979 Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
985 Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
988 const char * const ptr = SvPV_const(sv,len);
990 PERL_ARGS_ASSERT_GV_STASHSV;
992 return gv_stashpvn(ptr, len, flags);
997 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
998 PERL_ARGS_ASSERT_GV_FETCHPV;
999 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
1003 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
1005 const char * const nambeg = SvPV_const(name, len);
1006 PERL_ARGS_ASSERT_GV_FETCHSV;
1007 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1011 S_gv_magicalize_isa(pTHX_ GV *gv)
1015 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1019 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1024 S_gv_magicalize_overload(pTHX_ GV *gv)
1028 PERL_ARGS_ASSERT_GV_MAGICALIZE_OVERLOAD;
1032 hv_magic(hv, NULL, PERL_MAGIC_overload);
1036 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
1037 const svtype sv_type)
1040 register const char *name = nambeg;
1041 register GV *gv = NULL;
1044 register const char *name_cursor;
1046 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
1047 const I32 no_expand = flags & GV_NOEXPAND;
1048 const I32 add = flags & ~GV_NOADD_MASK;
1049 const char *const name_end = nambeg + full_len;
1050 const char *const name_em1 = name_end - 1;
1053 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
1055 if (flags & GV_NOTQUAL) {
1056 /* Caller promised that there is no stash, so we can skip the check. */
1061 if (full_len > 2 && *name == '*' && isALPHA(name[1])) {
1062 /* accidental stringify on a GV? */
1066 for (name_cursor = name; name_cursor < name_end; name_cursor++) {
1067 if (name_cursor < name_em1 &&
1068 ((*name_cursor == ':'
1069 && name_cursor[1] == ':')
1070 || *name_cursor == '\''))
1073 stash = PL_defstash;
1074 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
1077 len = name_cursor - name;
1078 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1080 if (*name_cursor == ':') {
1085 Newx(tmpbuf, len+2, char);
1086 Copy(name, tmpbuf, len, char);
1087 tmpbuf[len++] = ':';
1088 tmpbuf[len++] = ':';
1091 gvp = (GV**)hv_fetch(stash, key, len, add);
1092 gv = gvp ? *gvp : NULL;
1093 if (gv && gv != (const GV *)&PL_sv_undef) {
1094 if (SvTYPE(gv) != SVt_PVGV)
1095 gv_init(gv, stash, key, len, (add & GV_ADDMULTI));
1101 if (!gv || gv == (const GV *)&PL_sv_undef)
1104 if (!(stash = GvHV(gv)))
1106 stash = GvHV(gv) = newHV();
1107 if (!HvNAME_get(stash)) {
1108 hv_name_set(stash, nambeg, name_cursor-nambeg, 0);
1109 /* If the containing stash has multiple effective
1110 names, see that this one gets them, too. */
1111 if (HvAUX(GvSTASH(gv))->xhv_name_count)
1112 mro_package_moved(stash, NULL, gv, 1);
1115 else if (!HvNAME_get(stash))
1116 hv_name_set(stash, nambeg, name_cursor - nambeg, 0);
1119 if (*name_cursor == ':')
1121 name = name_cursor+1;
1122 if (name == name_end)
1124 ? gv : MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1127 len = name_cursor - name;
1129 /* No stash in name, so see how we can default */
1133 if (len && isIDFIRST_lazy(name)) {
1134 bool global = FALSE;
1142 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1143 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1144 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
1148 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1153 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1154 && name[3] == 'I' && name[4] == 'N')
1158 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1159 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1160 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
1164 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1165 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1172 stash = PL_defstash;
1173 else if (IN_PERL_COMPILETIME) {
1174 stash = PL_curstash;
1175 if (add && (PL_hints & HINT_STRICT_VARS) &&
1176 sv_type != SVt_PVCV &&
1177 sv_type != SVt_PVGV &&
1178 sv_type != SVt_PVFM &&
1179 sv_type != SVt_PVIO &&
1180 !(len == 1 && sv_type == SVt_PV &&
1181 (*name == 'a' || *name == 'b')) )
1183 gvp = (GV**)hv_fetch(stash,name,len,0);
1185 *gvp == (const GV *)&PL_sv_undef ||
1186 SvTYPE(*gvp) != SVt_PVGV)
1190 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1191 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1192 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1194 /* diag_listed_as: Variable "%s" is not imported%s */
1196 aTHX_ packWARN(WARN_MISC),
1197 "Variable \"%c%s\" is not imported",
1198 sv_type == SVt_PVAV ? '@' :
1199 sv_type == SVt_PVHV ? '%' : '$',
1203 aTHX_ packWARN(WARN_MISC),
1204 "\t(Did you mean &%s instead?)\n", name
1211 stash = CopSTASH(PL_curcop);
1214 stash = PL_defstash;
1217 /* By this point we should have a stash and a name */
1221 SV * const err = Perl_mess(aTHX_
1222 "Global symbol \"%s%s\" requires explicit package name",
1223 (sv_type == SVt_PV ? "$"
1224 : sv_type == SVt_PVAV ? "@"
1225 : sv_type == SVt_PVHV ? "%"
1228 if (USE_UTF8_IN_NAMES)
1231 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1233 /* symbol table under destruction */
1242 if (!SvREFCNT(stash)) /* symbol table under destruction */
1245 gvp = (GV**)hv_fetch(stash,name,len,add);
1246 if (!gvp || *gvp == (const GV *)&PL_sv_undef)
1249 if (SvTYPE(gv) == SVt_PVGV) {
1252 gv_init_sv(gv, sv_type);
1253 if (len == 1 && stash == PL_defstash
1254 && (sv_type == SVt_PVHV || sv_type == SVt_PVGV)) {
1256 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1257 else if (*name == '-' || *name == '+')
1258 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
1260 else if (len == 3 && sv_type == SVt_PVAV
1261 && strnEQ(name, "ISA", 3)
1262 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
1263 gv_magicalize_isa(gv);
1266 } else if (no_init) {
1268 } else if (no_expand && SvROK(gv)) {
1272 /* Adding a new symbol.
1273 Unless of course there was already something non-GV here, in which case
1274 we want to behave as if there was always a GV here, containing some sort
1276 Otherwise we run the risk of creating things like GvIO, which can cause
1277 subtle bugs. eg the one that tripped up SQL::Translator */
1279 faking_it = SvOK(gv);
1281 if (add & GV_ADDWARN)
1282 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
1283 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
1284 gv_init_sv(gv, faking_it ? SVt_PVCV : sv_type);
1286 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
1287 : (PL_dowarn & G_WARN_ON ) ) )
1290 /* set up magic where warranted */
1291 if (stash != PL_defstash) { /* not the main stash */
1292 /* We only have to check for four names here: EXPORT, ISA, OVERLOAD
1293 and VERSION. All the others apply only to the main stash. */
1295 const char * const name2 = name + 1;
1298 if (strnEQ(name2, "XPORT", 5))
1302 if (strEQ(name2, "SA"))
1303 gv_magicalize_isa(gv);
1306 if (strEQ(name2, "VERLOAD"))
1307 gv_magicalize_overload(gv);
1310 if (strEQ(name2, "ERSION"))
1320 /* Nothing else to do.
1321 The compiler will probably turn the switch statement into a
1322 branch table. Make sure we avoid even that small overhead for
1323 the common case of lower case variable names. */
1327 const char * const name2 = name + 1;
1330 if (strEQ(name2, "RGV")) {
1331 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1333 else if (strEQ(name2, "RGVOUT")) {
1338 if (strnEQ(name2, "XPORT", 5))
1342 if (strEQ(name2, "SA")) {
1343 gv_magicalize_isa(gv);
1347 if (strEQ(name2, "VERLOAD")) {
1348 gv_magicalize_overload(gv);
1352 if (strEQ(name2, "IG")) {
1355 if (!PL_psig_name) {
1356 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
1357 Newxz(PL_psig_pend, SIG_SIZE, int);
1358 PL_psig_ptr = PL_psig_name + SIG_SIZE;
1360 /* I think that the only way to get here is to re-use an
1361 embedded perl interpreter, where the previous
1362 use didn't clean up fully because
1363 PL_perl_destruct_level was 0. I'm not sure that we
1364 "support" that, in that I suspect in that scenario
1365 there are sufficient other garbage values left in the
1366 interpreter structure that something else will crash
1367 before we get here. I suspect that this is one of
1368 those "doctor, it hurts when I do this" bugs. */
1369 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
1370 Zero(PL_psig_pend, SIG_SIZE, int);
1374 hv_magic(hv, NULL, PERL_MAGIC_sig);
1375 for (i = 1; i < SIG_SIZE; i++) {
1376 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1378 sv_setsv(*init, &PL_sv_undef);
1383 if (strEQ(name2, "ERSION"))
1386 case '\003': /* $^CHILD_ERROR_NATIVE */
1387 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1390 case '\005': /* $^ENCODING */
1391 if (strEQ(name2, "NCODING"))
1394 case '\007': /* $^GLOBAL_PHASE */
1395 if (strEQ(name2, "LOBAL_PHASE"))
1398 case '\015': /* $^MATCH */
1399 if (strEQ(name2, "ATCH"))
1401 case '\017': /* $^OPEN */
1402 if (strEQ(name2, "PEN"))
1405 case '\020': /* $^PREMATCH $^POSTMATCH */
1406 if (strEQ(name2, "REMATCH") || strEQ(name2, "OSTMATCH"))
1409 case '\024': /* ${^TAINT} */
1410 if (strEQ(name2, "AINT"))
1413 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1414 if (strEQ(name2, "NICODE"))
1416 if (strEQ(name2, "TF8LOCALE"))
1418 if (strEQ(name2, "TF8CACHE"))
1421 case '\027': /* $^WARNING_BITS */
1422 if (strEQ(name2, "ARNING_BITS"))
1435 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1437 /* This snippet is taken from is_gv_magical */
1438 const char *end = name + len;
1439 while (--end > name) {
1440 if (!isDIGIT(*end)) return gv;
1447 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1448 be case '\0' in this switch statement (ie a default case) */
1454 sv_type == SVt_PVAV ||
1455 sv_type == SVt_PVHV ||
1456 sv_type == SVt_PVCV ||
1457 sv_type == SVt_PVFM ||
1460 PL_sawampersand = TRUE;
1464 sv_setpv(GvSVn(gv),PL_chopset);
1468 #ifdef COMPLEX_STATUS
1469 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1475 /* If %! has been used, automatically load Errno.pm. */
1477 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1479 /* magicalization must be done before require_tie_mod is called */
1480 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1481 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1486 GvMULTI_on(gv); /* no used once warnings here */
1488 AV* const av = GvAVn(gv);
1489 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
1491 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
1492 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1494 SvREADONLY_on(GvSVn(gv));
1497 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1498 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
1504 if (sv_type == SVt_PV)
1505 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1506 "$%c is no longer supported", *name);
1509 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1512 case '\010': /* $^H */
1514 HV *const hv = GvHVn(gv);
1515 hv_magic(hv, NULL, PERL_MAGIC_hints);
1518 case '\023': /* $^S */
1520 SvREADONLY_on(GvSVn(gv));
1545 case '\001': /* $^A */
1546 case '\003': /* $^C */
1547 case '\004': /* $^D */
1548 case '\005': /* $^E */
1549 case '\006': /* $^F */
1550 case '\011': /* $^I, NOT \t in EBCDIC */
1551 case '\016': /* $^N */
1552 case '\017': /* $^O */
1553 case '\020': /* $^P */
1554 case '\024': /* $^T */
1555 case '\027': /* $^W */
1557 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1560 case '\014': /* $^L */
1561 sv_setpvs(GvSVn(gv),"\f");
1562 PL_formfeed = GvSVn(gv);
1565 sv_setpvs(GvSVn(gv),"\034");
1569 SV * const sv = GvSVn(gv);
1570 if (!sv_derived_from(PL_patchlevel, "version"))
1571 upg_version(PL_patchlevel, TRUE);
1572 GvSV(gv) = vnumify(PL_patchlevel);
1573 SvREADONLY_on(GvSV(gv));
1577 case '\026': /* $^V */
1579 SV * const sv = GvSVn(gv);
1580 GvSV(gv) = new_version(PL_patchlevel);
1581 SvREADONLY_on(GvSV(gv));
1591 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1595 const HV * const hv = GvSTASH(gv);
1597 PERL_ARGS_ASSERT_GV_FULLNAME4;
1603 sv_setpv(sv, prefix ? prefix : "");
1605 name = HvNAME_get(hv);
1607 namelen = HvNAMELEN_get(hv);
1613 if (keepmain || strNE(name, "main")) {
1614 sv_catpvn(sv,name,namelen);
1617 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1621 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1623 const GV * const egv = GvEGVx(gv);
1625 PERL_ARGS_ASSERT_GV_EFULLNAME4;
1627 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1631 Perl_gv_check(pTHX_ const HV *stash)
1636 PERL_ARGS_ASSERT_GV_CHECK;
1638 if (!HvARRAY(stash))
1640 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1642 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1645 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1646 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
1648 if (hv != PL_defstash && hv != stash)
1649 gv_check(hv); /* nested package */
1651 else if (isALPHA(*HeKEY(entry))) {
1653 gv = MUTABLE_GV(HeVAL(entry));
1654 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1657 CopLINE_set(PL_curcop, GvLINE(gv));
1659 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1661 CopFILEGV(PL_curcop)
1662 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
1664 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1665 "Name \"%s::%s\" used only once: possible typo",
1666 HvNAME_get(stash), GvNAME(gv));
1673 Perl_newGVgen(pTHX_ const char *pack)
1677 PERL_ARGS_ASSERT_NEWGVGEN;
1679 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1683 /* hopefully this is only called on local symbol table entries */
1686 Perl_gp_ref(pTHX_ GP *gp)
1694 /* If the GP they asked for a reference to contains
1695 a method cache entry, clear it first, so that we
1696 don't infect them with our cached entry */
1697 SvREFCNT_dec(gp->gp_cv);
1706 Perl_gp_free(pTHX_ GV *gv)
1712 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
1714 if (gp->gp_refcnt == 0) {
1715 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
1716 "Attempt to free unreferenced glob pointers"
1717 pTHX__FORMAT pTHX__VALUE);
1720 if (--gp->gp_refcnt > 0) {
1721 if (gp->gp_egv == gv)
1728 /* Copy and null out all the glob slots, so destructors do not see
1730 HEK * const file_hek = gp->gp_file_hek;
1731 SV * const sv = gp->gp_sv;
1732 AV * const av = gp->gp_av;
1733 HV * const hv = gp->gp_hv;
1734 IO * const io = gp->gp_io;
1735 CV * const cv = gp->gp_cv;
1736 CV * const form = gp->gp_form;
1738 gp->gp_file_hek = NULL;
1747 unshare_hek(file_hek);
1751 /* FIXME - another reference loop GV -> symtab -> GV ?
1752 Somehow gp->gp_hv can end up pointing at freed garbage. */
1753 if (hv && SvTYPE(hv) == SVt_PVHV) {
1754 const char *hvname = HvNAME_get(hv);
1755 if (PL_stashcache && hvname)
1756 (void)hv_delete(PL_stashcache, hvname, HvNAMELEN_get(hv),
1764 if (!gp->gp_file_hek
1770 && !gp->gp_form) break;
1772 if (--attempts == 0) {
1774 "panic: gp_free failed to free glob pointer - "
1775 "something is repeatedly re-creating entries"
1785 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1787 AMT * const amtp = (AMT*)mg->mg_ptr;
1788 PERL_UNUSED_ARG(sv);
1790 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
1792 if (amtp && AMT_AMAGIC(amtp)) {
1794 for (i = 1; i < NofAMmeth; i++) {
1795 CV * const cv = amtp->table[i];
1797 SvREFCNT_dec(MUTABLE_SV(cv));
1798 amtp->table[i] = NULL;
1805 /* Updates and caches the CV's */
1807 * 1 on success and there is some overload
1808 * 0 if there is no overload
1809 * -1 if some error occurred and it couldn't croak
1813 Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
1816 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
1818 const struct mro_meta* stash_meta = HvMROMETA(stash);
1821 PERL_ARGS_ASSERT_GV_AMUPDATE;
1823 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
1825 const AMT * const amtp = (AMT*)mg->mg_ptr;
1826 if (amtp->was_ok_am == PL_amagic_generation
1827 && amtp->was_ok_sub == newgen) {
1828 return AMT_OVERLOADED(amtp) ? 1 : 0;
1830 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
1833 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1836 amt.was_ok_am = PL_amagic_generation;
1837 amt.was_ok_sub = newgen;
1838 amt.fallback = AMGfallNO;
1842 int filled = 0, have_ovl = 0;
1845 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1847 /* Try to find via inheritance. */
1848 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1849 SV * const sv = gv ? GvSV(gv) : NULL;
1853 lim = DESTROY_amg; /* Skip overloading entries. */
1854 #ifdef PERL_DONT_CREATE_GVSV
1856 NOOP; /* Equivalent to !SvTRUE and !SvOK */
1859 else if (SvTRUE(sv))
1860 amt.fallback=AMGfallYES;
1862 amt.fallback=AMGfallNEVER;
1864 for (i = 1; i < lim; i++)
1865 amt.table[i] = NULL;
1866 for (; i < NofAMmeth; i++) {
1867 const char * const cooky = PL_AMG_names[i];
1868 /* Human-readable form, for debugging: */
1869 const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1870 const STRLEN l = PL_AMG_namelens[i];
1872 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1873 cp, HvNAME_get(stash)) );
1874 /* don't fill the cache while looking up!
1875 Creation of inheritance stubs in intermediate packages may
1876 conflict with the logic of runtime method substitution.
1877 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1878 then we could have created stubs for "(+0" in A and C too.
1879 But if B overloads "bool", we may want to use it for
1880 numifying instead of C's "+0". */
1881 if (i >= DESTROY_amg)
1882 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1883 else /* Autoload taken care of below */
1884 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1886 if (gv && (cv = GvCV(gv))) {
1888 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1889 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1890 /* This is a hack to support autoloading..., while
1891 knowing *which* methods were declared as overloaded. */
1892 /* GvSV contains the name of the method. */
1894 SV *gvsv = GvSV(gv);
1896 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1897 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1898 (void*)GvSV(gv), cp, hvname) );
1899 if (!gvsv || !SvPOK(gvsv)
1900 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1903 /* Can be an import stub (created by "can"). */
1908 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1909 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1910 "in package \"%.256s\"",
1911 (GvCVGEN(gv) ? "Stub found while resolving"
1916 cv = GvCV(gv = ngv);
1918 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1919 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1920 GvNAME(CvGV(cv))) );
1922 if (i < DESTROY_amg)
1924 } else if (gv) { /* Autoloaded... */
1925 cv = MUTABLE_CV(gv);
1928 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
1931 AMT_AMAGIC_on(&amt);
1933 AMT_OVERLOADED_on(&amt);
1934 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
1935 (char*)&amt, sizeof(AMT));
1939 /* Here we have no table: */
1941 AMT_AMAGIC_off(&amt);
1942 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
1943 (char*)&amt, sizeof(AMTS));
1949 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1955 struct mro_meta* stash_meta;
1957 if (!stash || !HvNAME_get(stash))
1960 stash_meta = HvMROMETA(stash);
1961 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
1963 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
1966 /* If we're looking up a destructor to invoke, we must avoid
1967 * that Gv_AMupdate croaks, because we might be dying already */
1968 if (Gv_AMupdate(stash, cBOOL(id == DESTROY_amg)) == -1) {
1969 /* and if it didn't found a destructor, we fall back
1970 * to a simpler method that will only look for the
1971 * destructor instead of the whole magic */
1972 if (id == DESTROY_amg) {
1973 GV * const gv = gv_fetchmethod(stash, "DESTROY");
1979 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
1982 amtp = (AMT*)mg->mg_ptr;
1983 if ( amtp->was_ok_am != PL_amagic_generation
1984 || amtp->was_ok_sub != newgen )
1986 if (AMT_AMAGIC(amtp)) {
1987 CV * const ret = amtp->table[id];
1988 if (ret && isGV(ret)) { /* Autoloading stab */
1989 /* Passing it through may have resulted in a warning
1990 "Inherited AUTOLOAD for a non-method deprecated", since
1991 our caller is going through a function call, not a method call.
1992 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1993 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
2005 /* Implement tryAMAGICun_MG macro.
2006 Do get magic, then see if the stack arg is overloaded and if so call it.
2008 AMGf_set return the arg using SETs rather than assigning to
2010 AMGf_numeric apply sv_2num to the stack arg.
2014 Perl_try_amagic_un(pTHX_ int method, int flags) {
2018 SV* const arg = TOPs;
2022 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2023 AMGf_noright | AMGf_unary))) {
2024 if (flags & AMGf_set) {
2029 if (SvPADMY(TARG)) {
2030 sv_setsv(TARG, tmpsv);
2040 if ((flags & AMGf_numeric) && SvROK(arg))
2046 /* Implement tryAMAGICbin_MG macro.
2047 Do get magic, then see if the two stack args are overloaded and if so
2050 AMGf_set return the arg using SETs rather than assigning to
2052 AMGf_assign op may be called as mutator (eg +=)
2053 AMGf_numeric apply sv_2num to the stack arg.
2057 Perl_try_amagic_bin(pTHX_ int method, int flags) {
2060 SV* const left = TOPm1s;
2061 SV* const right = TOPs;
2067 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2068 SV * const tmpsv = amagic_call(left, right, method,
2069 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2071 if (flags & AMGf_set) {
2078 if (opASSIGN || SvPADMY(TARG)) {
2079 sv_setsv(TARG, tmpsv);
2089 if(left==right && SvGMAGICAL(left)) {
2090 SV * const left = sv_newmortal();
2092 /* Print the uninitialized warning now, so it includes the vari-
2095 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2096 sv_setsv_flags(left, &PL_sv_no, 0);
2098 else sv_setsv_flags(left, right, 0);
2101 if (flags & AMGf_numeric) {
2103 *(sp-1) = sv_2num(TOPm1s);
2105 *sp = sv_2num(right);
2111 Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2114 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2116 while (SvAMAGIC(ref) &&
2117 (tmpsv = amagic_call(ref, &PL_sv_undef, method,
2118 AMGf_noright | AMGf_unary))) {
2120 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2121 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2122 /* Bail out if it returns us the same reference. */
2127 return tmpsv ? tmpsv : ref;
2131 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
2136 CV **cvp=NULL, **ocvp=NULL;
2137 AMT *amtp=NULL, *oamtp=NULL;
2138 int off = 0, off1, lr = 0, notfound = 0;
2139 int postpr = 0, force_cpy = 0;
2140 int assign = AMGf_assign & flags;
2141 const int assignshift = assign ? 1 : 0;
2142 int use_default_op = 0;
2148 PERL_ARGS_ASSERT_AMAGIC_CALL;
2150 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
2151 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2153 if ( !lex_mask || !SvOK(lex_mask) )
2154 /* overloading lexically disabled */
2156 else if ( lex_mask && SvPOK(lex_mask) ) {
2157 /* we have an entry in the hints hash, check if method has been
2158 * masked by overloading.pm */
2160 const int offset = method / 8;
2161 const int bit = method % 8;
2162 char *pv = SvPV(lex_mask, len);
2164 /* Bit set, so this overloading operator is disabled */
2165 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2170 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
2171 && (stash = SvSTASH(SvRV(left)))
2172 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
2173 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
2174 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
2176 && ((cv = cvp[off=method+assignshift])
2177 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2183 cv = cvp[off=method])))) {
2184 lr = -1; /* Call method for left argument */
2186 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2189 /* look for substituted methods */
2190 /* In all the covered cases we should be called with assign==0. */
2194 if ((cv = cvp[off=add_ass_amg])
2195 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
2196 right = &PL_sv_yes; lr = -1; assign = 1;
2201 if ((cv = cvp[off = subtr_ass_amg])
2202 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
2203 right = &PL_sv_yes; lr = -1; assign = 1;
2207 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
2210 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
2213 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
2216 (void)((cv = cvp[off=bool__amg])
2217 || (cv = cvp[off=numer_amg])
2218 || (cv = cvp[off=string_amg]));
2225 * SV* ref causes confusion with the interpreter variable of
2228 SV* const tmpRef=SvRV(left);
2229 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
2231 * Just to be extra cautious. Maybe in some
2232 * additional cases sv_setsv is safe, too.
2234 SV* const newref = newSVsv(tmpRef);
2235 SvOBJECT_on(newref);
2236 /* As a bit of a source compatibility hack, SvAMAGIC() and
2237 friends dereference an RV, to behave the same was as when
2238 overloading was stored on the reference, not the referant.
2239 Hence we can't use SvAMAGIC_on()
2241 SvFLAGS(newref) |= SVf_AMAGIC;
2242 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
2248 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
2249 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
2250 SV* const nullsv=sv_2mortal(newSViv(0));
2252 SV* const lessp = amagic_call(left,nullsv,
2253 lt_amg,AMGf_noright);
2254 logic = SvTRUE(lessp);
2256 SV* const lessp = amagic_call(left,nullsv,
2257 ncmp_amg,AMGf_noright);
2258 logic = (SvNV(lessp) < 0);
2261 if (off==subtr_amg) {
2272 if ((cv = cvp[off=subtr_amg])) {
2274 left = sv_2mortal(newSViv(0));
2279 case iter_amg: /* XXXX Eventually should do to_gv. */
2280 case ftest_amg: /* XXXX Eventually should do to_gv. */
2283 return NULL; /* Delegate operation to standard mechanisms. */
2291 return left; /* Delegate operation to standard mechanisms. */
2296 if (!cv) goto not_found;
2297 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
2298 && (stash = SvSTASH(SvRV(right)))
2299 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
2300 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
2301 ? (amtp = (AMT*)mg->mg_ptr)->table
2303 && (cv = cvp[off=method])) { /* Method for right
2306 } else if (((cvp && amtp->fallback > AMGfallNEVER)
2307 || (ocvp && oamtp->fallback > AMGfallNEVER))
2308 && !(flags & AMGf_unary)) {
2309 /* We look for substitution for
2310 * comparison operations and
2312 if (method==concat_amg || method==concat_ass_amg
2313 || method==repeat_amg || method==repeat_ass_amg) {
2314 return NULL; /* Delegate operation to string conversion */
2336 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
2340 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
2350 not_found: /* No method found, either report or croak */
2358 return left; /* Delegate operation to standard mechanisms. */
2361 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
2362 notfound = 1; lr = -1;
2363 } else if (cvp && (cv=cvp[nomethod_amg])) {
2364 notfound = 1; lr = 1;
2365 } else if ((use_default_op =
2366 (!ocvp || oamtp->fallback >= AMGfallYES)
2367 && (!cvp || amtp->fallback >= AMGfallYES))
2369 /* Skip generating the "no method found" message. */
2373 if (off==-1) off=method;
2374 msg = sv_2mortal(Perl_newSVpvf(aTHX_
2375 "Operation \"%s\": no method found,%sargument %s%s%s%s",
2376 AMG_id2name(method + assignshift),
2377 (flags & AMGf_unary ? " " : "\n\tleft "),
2379 "in overloaded package ":
2380 "has no overloaded magic",
2382 HvNAME_get(SvSTASH(SvRV(left))):
2385 ",\n\tright argument in overloaded package ":
2388 : ",\n\tright argument has no overloaded magic"),
2390 HvNAME_get(SvSTASH(SvRV(right))):
2392 if (use_default_op) {
2393 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
2395 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
2399 force_cpy = force_cpy || assign;
2404 DEBUG_o(Perl_deb(aTHX_
2405 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
2407 method+assignshift==off? "" :
2409 method+assignshift==off? "" :
2410 AMG_id2name(method+assignshift),
2411 method+assignshift==off? "" : "\")",
2412 flags & AMGf_unary? "" :
2413 lr==1 ? " for right argument": " for left argument",
2414 flags & AMGf_unary? " for argument" : "",
2415 stash ? HvNAME_get(stash) : "null",
2416 fl? ",\n\tassignment variant used": "") );
2419 /* Since we use shallow copy during assignment, we need
2420 * to dublicate the contents, probably calling user-supplied
2421 * version of copy operator
2423 /* We need to copy in following cases:
2424 * a) Assignment form was called.
2425 * assignshift==1, assign==T, method + 1 == off
2426 * b) Increment or decrement, called directly.
2427 * assignshift==0, assign==0, method + 0 == off
2428 * c) Increment or decrement, translated to assignment add/subtr.
2429 * assignshift==0, assign==T,
2431 * d) Increment or decrement, translated to nomethod.
2432 * assignshift==0, assign==0,
2434 * e) Assignment form translated to nomethod.
2435 * assignshift==1, assign==T, method + 1 != off
2438 /* off is method, method+assignshift, or a result of opcode substitution.
2439 * In the latter case assignshift==0, so only notfound case is important.
2441 if (( (method + assignshift == off)
2442 && (assign || (method == inc_amg) || (method == dec_amg)))
2445 /* newSVsv does not behave as advertised, so we copy missing
2446 * information by hand */
2447 SV *tmpRef = SvRV(left);
2449 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
2450 SvRV_set(left, rv_copy);
2452 SvREFCNT_dec(tmpRef);
2460 const bool oldcatch = CATCH_GET;
2463 Zero(&myop, 1, BINOP);
2464 myop.op_last = (OP *) &myop;
2465 myop.op_next = NULL;
2466 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
2468 PUSHSTACKi(PERLSI_OVERLOAD);
2471 PL_op = (OP *) &myop;
2472 if (PERLDB_SUB && PL_curstash != PL_debstash)
2473 PL_op->op_private |= OPpENTERSUB_DB;
2475 Perl_pp_pushmark(aTHX);
2477 EXTEND(SP, notfound + 5);
2478 PUSHs(lr>0? right: left);
2479 PUSHs(lr>0? left: right);
2480 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
2482 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
2483 AMG_id2namelen(method + assignshift), SVs_TEMP));
2485 PUSHs(MUTABLE_SV(cv));
2488 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
2496 CATCH_SET(oldcatch);
2503 ans=SvIV(res)<=0; break;
2506 ans=SvIV(res)<0; break;
2509 ans=SvIV(res)>=0; break;
2512 ans=SvIV(res)>0; break;
2515 ans=SvIV(res)==0; break;
2518 ans=SvIV(res)!=0; break;
2521 SvSetSV(left,res); return left;
2523 ans=!SvTRUE(res); break;
2528 } else if (method==copy_amg) {
2530 Perl_croak(aTHX_ "Copy method did not return a reference");
2532 return SvREFCNT_inc(SvRV(res));
2540 =for apidoc is_gv_magical_sv
2542 Returns C<TRUE> if given the name of a magical GV.
2544 Currently only useful internally when determining if a GV should be
2545 created even in rvalue contexts.
2547 C<flags> is not used at present but available for future extension to
2548 allow selecting particular classes of magical variable.
2550 Currently assumes that C<name> is NUL terminated (as well as len being valid).
2551 This assumption is met by all callers within the perl core, which all pass
2552 pointers returned by SvPV.
2558 Perl_is_gv_magical_sv(pTHX_ SV *const name_sv, U32 flags)
2561 const char *const name = SvPV_const(name_sv, len);
2563 PERL_UNUSED_ARG(flags);
2564 PERL_ARGS_ASSERT_IS_GV_MAGICAL_SV;
2567 const char * const name1 = name + 1;
2570 if (len == 3 && name[1] == 'S' && name[2] == 'A')
2574 if (len == 8 && strEQ(name1, "VERLOAD"))
2578 if (len == 3 && name[1] == 'I' && name[2] == 'G')
2581 /* Using ${^...} variables is likely to be sufficiently rare that
2582 it seems sensible to avoid the space hit of also checking the
2584 case '\017': /* ${^OPEN} */
2585 if (strEQ(name1, "PEN"))
2588 case '\024': /* ${^TAINT} */
2589 if (strEQ(name1, "AINT"))
2592 case '\025': /* ${^UNICODE} */
2593 if (strEQ(name1, "NICODE"))
2595 if (strEQ(name1, "TF8LOCALE"))
2598 case '\027': /* ${^WARNING_BITS} */
2599 if (strEQ(name1, "ARNING_BITS"))
2612 const char *end = name + len;
2613 while (--end > name) {
2621 /* Because we're already assuming that name is NUL terminated
2622 below, we can treat an empty name as "\0" */
2648 case '\001': /* $^A */
2649 case '\003': /* $^C */
2650 case '\004': /* $^D */
2651 case '\005': /* $^E */
2652 case '\006': /* $^F */
2653 case '\010': /* $^H */
2654 case '\011': /* $^I, NOT \t in EBCDIC */
2655 case '\014': /* $^L */
2656 case '\016': /* $^N */
2657 case '\017': /* $^O */
2658 case '\020': /* $^P */
2659 case '\023': /* $^S */
2660 case '\024': /* $^T */
2661 case '\026': /* $^V */
2662 case '\027': /* $^W */
2682 Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
2687 PERL_ARGS_ASSERT_GV_NAME_SET;
2688 PERL_UNUSED_ARG(flags);
2691 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
2693 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
2694 unshare_hek(GvNAME_HEK(gv));
2697 PERL_HASH(hash, name, len);
2698 GvNAME_HEK(gv) = share_hek(name, len, hash);
2702 =for apidoc gv_try_downgrade
2704 If the typeglob C<gv> can be expressed more succinctly, by having
2705 something other than a real GV in its place in the stash, replace it
2706 with the optimised form. Basic requirements for this are that C<gv>
2707 is a real typeglob, is sufficiently ordinary, and is only referenced
2708 from its package. This function is meant to be used when a GV has been
2709 looked up in part to see what was there, causing upgrading, but based
2710 on what was found it turns out that the real GV isn't required after all.
2712 If C<gv> is a completely empty typeglob, it is deleted from the stash.
2714 If C<gv> is a typeglob containing only a sufficiently-ordinary constant
2715 sub, the typeglob is replaced with a scalar-reference placeholder that
2716 more compactly represents the same thing.
2722 Perl_gv_try_downgrade(pTHX_ GV *gv)
2728 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
2730 /* XXX Why and where does this leave dangling pointers during global
2732 if (PL_phase == PERL_PHASE_DESTRUCT) return;
2734 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
2735 !SvOBJECT(gv) && !SvREADONLY(gv) &&
2736 isGV_with_GP(gv) && GvGP(gv) &&
2737 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
2738 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
2739 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2741 if (SvMAGICAL(gv)) {
2743 /* only backref magic is allowed */
2744 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
2746 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
2747 if (mg->mg_type != PERL_MAGIC_backref)
2753 HEK *gvnhek = GvNAME_HEK(gv);
2754 (void)hv_delete(stash, HEK_KEY(gvnhek),
2755 HEK_UTF8(gvnhek) ? -HEK_LEN(gvnhek) : HEK_LEN(gvnhek), G_DISCARD);
2756 } else if (GvMULTI(gv) && cv &&
2757 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
2758 CvSTASH(cv) == stash && CvGV(cv) == gv &&
2759 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
2760 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
2761 (namehek = GvNAME_HEK(gv)) &&
2762 (gvp = hv_fetch(stash, HEK_KEY(namehek),
2763 HEK_LEN(namehek)*(HEK_UTF8(namehek) ? -1 : 1), 0)) &&
2765 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
2769 SvFLAGS(gv) = SVt_IV|SVf_ROK;
2770 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
2771 STRUCT_OFFSET(XPVIV, xiv_iv));
2772 SvRV_set(gv, value);
2778 * c-indentation-style: bsd
2780 * indent-tabs-mode: t
2783 * ex: set ts=8 sts=4 sw=4 noet: