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;
963 if (!HvNAME_get(stash)) {
964 hv_name_set(stash, name, namelen, 0);
966 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
967 /* If the containing stash has multiple effective
968 names, see that this one gets them, too. */
969 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
970 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_cursor < name_em1
1068 && name_cursor[1] == ':')
1069 || (*name_cursor == '\'' && name_cursor[1]))
1072 stash = PL_defstash;
1073 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
1076 len = name_cursor - name;
1077 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1079 if (*name_cursor == ':') {
1084 Newx(tmpbuf, len+2, char);
1085 Copy(name, tmpbuf, len, char);
1086 tmpbuf[len++] = ':';
1087 tmpbuf[len++] = ':';
1090 gvp = (GV**)hv_fetch(stash, key, len, add);
1091 gv = gvp ? *gvp : NULL;
1092 if (gv && gv != (const GV *)&PL_sv_undef) {
1093 if (SvTYPE(gv) != SVt_PVGV)
1094 gv_init(gv, stash, key, len, (add & GV_ADDMULTI));
1100 if (!gv || gv == (const GV *)&PL_sv_undef)
1103 if (!(stash = GvHV(gv)))
1105 stash = GvHV(gv) = newHV();
1106 if (!HvNAME_get(stash)) {
1107 hv_name_set(stash, nambeg, name_cursor-nambeg, 0);
1108 /* If the containing stash has multiple effective
1109 names, see that this one gets them, too. */
1110 if (HvAUX(GvSTASH(gv))->xhv_name_count)
1111 mro_package_moved(stash, NULL, gv, 1);
1114 else if (!HvNAME_get(stash))
1115 hv_name_set(stash, nambeg, name_cursor - nambeg, 0);
1118 if (*name_cursor == ':')
1120 name = name_cursor+1;
1121 if (name == name_end)
1123 ? gv : MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1126 len = name_cursor - name;
1128 /* No stash in name, so see how we can default */
1132 if (len && isIDFIRST_lazy(name)) {
1133 bool global = FALSE;
1141 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1142 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1143 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
1147 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1152 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1153 && name[3] == 'I' && name[4] == 'N')
1157 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1158 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1159 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
1163 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1164 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1171 stash = PL_defstash;
1172 else if (IN_PERL_COMPILETIME) {
1173 stash = PL_curstash;
1174 if (add && (PL_hints & HINT_STRICT_VARS) &&
1175 sv_type != SVt_PVCV &&
1176 sv_type != SVt_PVGV &&
1177 sv_type != SVt_PVFM &&
1178 sv_type != SVt_PVIO &&
1179 !(len == 1 && sv_type == SVt_PV &&
1180 (*name == 'a' || *name == 'b')) )
1182 gvp = (GV**)hv_fetch(stash,name,len,0);
1184 *gvp == (const GV *)&PL_sv_undef ||
1185 SvTYPE(*gvp) != SVt_PVGV)
1189 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1190 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1191 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1193 /* diag_listed_as: Variable "%s" is not imported%s */
1195 aTHX_ packWARN(WARN_MISC),
1196 "Variable \"%c%s\" is not imported",
1197 sv_type == SVt_PVAV ? '@' :
1198 sv_type == SVt_PVHV ? '%' : '$',
1202 aTHX_ packWARN(WARN_MISC),
1203 "\t(Did you mean &%s instead?)\n", name
1210 stash = CopSTASH(PL_curcop);
1213 stash = PL_defstash;
1216 /* By this point we should have a stash and a name */
1220 SV * const err = Perl_mess(aTHX_
1221 "Global symbol \"%s%s\" requires explicit package name",
1222 (sv_type == SVt_PV ? "$"
1223 : sv_type == SVt_PVAV ? "@"
1224 : sv_type == SVt_PVHV ? "%"
1227 if (USE_UTF8_IN_NAMES)
1230 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1232 /* symbol table under destruction */
1241 if (!SvREFCNT(stash)) /* symbol table under destruction */
1244 gvp = (GV**)hv_fetch(stash,name,len,add);
1245 if (!gvp || *gvp == (const GV *)&PL_sv_undef)
1248 if (SvTYPE(gv) == SVt_PVGV) {
1251 gv_init_sv(gv, sv_type);
1252 if (len == 1 && stash == PL_defstash
1253 && (sv_type == SVt_PVHV || sv_type == SVt_PVGV)) {
1255 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1256 else if (*name == '-' || *name == '+')
1257 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
1259 else if (len == 3 && sv_type == SVt_PVAV
1260 && strnEQ(name, "ISA", 3)
1261 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
1262 gv_magicalize_isa(gv);
1265 } else if (no_init) {
1267 } else if (no_expand && SvROK(gv)) {
1271 /* Adding a new symbol.
1272 Unless of course there was already something non-GV here, in which case
1273 we want to behave as if there was always a GV here, containing some sort
1275 Otherwise we run the risk of creating things like GvIO, which can cause
1276 subtle bugs. eg the one that tripped up SQL::Translator */
1278 faking_it = SvOK(gv);
1280 if (add & GV_ADDWARN)
1281 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
1282 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
1283 gv_init_sv(gv, faking_it ? SVt_PVCV : sv_type);
1285 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
1286 : (PL_dowarn & G_WARN_ON ) ) )
1289 /* set up magic where warranted */
1290 if (stash != PL_defstash) { /* not the main stash */
1291 /* We only have to check for four names here: EXPORT, ISA, OVERLOAD
1292 and VERSION. All the others apply only to the main stash. */
1294 const char * const name2 = name + 1;
1297 if (strnEQ(name2, "XPORT", 5))
1301 if (strEQ(name2, "SA"))
1302 gv_magicalize_isa(gv);
1305 if (strEQ(name2, "VERLOAD"))
1306 gv_magicalize_overload(gv);
1309 if (strEQ(name2, "ERSION"))
1319 /* Nothing else to do.
1320 The compiler will probably turn the switch statement into a
1321 branch table. Make sure we avoid even that small overhead for
1322 the common case of lower case variable names. */
1326 const char * const name2 = name + 1;
1329 if (strEQ(name2, "RGV")) {
1330 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1332 else if (strEQ(name2, "RGVOUT")) {
1337 if (strnEQ(name2, "XPORT", 5))
1341 if (strEQ(name2, "SA")) {
1342 gv_magicalize_isa(gv);
1346 if (strEQ(name2, "VERLOAD")) {
1347 gv_magicalize_overload(gv);
1351 if (strEQ(name2, "IG")) {
1354 if (!PL_psig_name) {
1355 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
1356 Newxz(PL_psig_pend, SIG_SIZE, int);
1357 PL_psig_ptr = PL_psig_name + SIG_SIZE;
1359 /* I think that the only way to get here is to re-use an
1360 embedded perl interpreter, where the previous
1361 use didn't clean up fully because
1362 PL_perl_destruct_level was 0. I'm not sure that we
1363 "support" that, in that I suspect in that scenario
1364 there are sufficient other garbage values left in the
1365 interpreter structure that something else will crash
1366 before we get here. I suspect that this is one of
1367 those "doctor, it hurts when I do this" bugs. */
1368 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
1369 Zero(PL_psig_pend, SIG_SIZE, int);
1373 hv_magic(hv, NULL, PERL_MAGIC_sig);
1374 for (i = 1; i < SIG_SIZE; i++) {
1375 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1377 sv_setsv(*init, &PL_sv_undef);
1382 if (strEQ(name2, "ERSION"))
1385 case '\003': /* $^CHILD_ERROR_NATIVE */
1386 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1389 case '\005': /* $^ENCODING */
1390 if (strEQ(name2, "NCODING"))
1393 case '\007': /* $^GLOBAL_PHASE */
1394 if (strEQ(name2, "LOBAL_PHASE"))
1397 case '\015': /* $^MATCH */
1398 if (strEQ(name2, "ATCH"))
1400 case '\017': /* $^OPEN */
1401 if (strEQ(name2, "PEN"))
1404 case '\020': /* $^PREMATCH $^POSTMATCH */
1405 if (strEQ(name2, "REMATCH") || strEQ(name2, "OSTMATCH"))
1408 case '\024': /* ${^TAINT} */
1409 if (strEQ(name2, "AINT"))
1412 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1413 if (strEQ(name2, "NICODE"))
1415 if (strEQ(name2, "TF8LOCALE"))
1417 if (strEQ(name2, "TF8CACHE"))
1420 case '\027': /* $^WARNING_BITS */
1421 if (strEQ(name2, "ARNING_BITS"))
1434 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1436 /* This snippet is taken from is_gv_magical */
1437 const char *end = name + len;
1438 while (--end > name) {
1439 if (!isDIGIT(*end)) return gv;
1446 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1447 be case '\0' in this switch statement (ie a default case) */
1453 sv_type == SVt_PVAV ||
1454 sv_type == SVt_PVHV ||
1455 sv_type == SVt_PVCV ||
1456 sv_type == SVt_PVFM ||
1459 PL_sawampersand = TRUE;
1463 sv_setpv(GvSVn(gv),PL_chopset);
1467 #ifdef COMPLEX_STATUS
1468 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1474 /* If %! has been used, automatically load Errno.pm. */
1476 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1478 /* magicalization must be done before require_tie_mod is called */
1479 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1480 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1485 GvMULTI_on(gv); /* no used once warnings here */
1487 AV* const av = GvAVn(gv);
1488 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
1490 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
1491 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1493 SvREADONLY_on(GvSVn(gv));
1496 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1497 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
1503 if (sv_type == SVt_PV)
1504 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1505 "$%c is no longer supported", *name);
1508 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1511 case '\010': /* $^H */
1513 HV *const hv = GvHVn(gv);
1514 hv_magic(hv, NULL, PERL_MAGIC_hints);
1517 case '\023': /* $^S */
1519 SvREADONLY_on(GvSVn(gv));
1543 case '\001': /* $^A */
1544 case '\003': /* $^C */
1545 case '\004': /* $^D */
1546 case '\005': /* $^E */
1547 case '\006': /* $^F */
1548 case '\011': /* $^I, NOT \t in EBCDIC */
1549 case '\016': /* $^N */
1550 case '\017': /* $^O */
1551 case '\020': /* $^P */
1552 case '\024': /* $^T */
1553 case '\027': /* $^W */
1555 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1558 case '\014': /* $^L */
1559 sv_setpvs(GvSVn(gv),"\f");
1560 PL_formfeed = GvSVn(gv);
1563 sv_setpvs(GvSVn(gv),"\034");
1567 SV * const sv = GvSVn(gv);
1568 if (!sv_derived_from(PL_patchlevel, "version"))
1569 upg_version(PL_patchlevel, TRUE);
1570 GvSV(gv) = vnumify(PL_patchlevel);
1571 SvREADONLY_on(GvSV(gv));
1575 case '\026': /* $^V */
1577 SV * const sv = GvSVn(gv);
1578 GvSV(gv) = new_version(PL_patchlevel);
1579 SvREADONLY_on(GvSV(gv));
1589 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1593 const HV * const hv = GvSTASH(gv);
1595 PERL_ARGS_ASSERT_GV_FULLNAME4;
1601 sv_setpv(sv, prefix ? prefix : "");
1603 name = HvNAME_get(hv);
1605 namelen = HvNAMELEN_get(hv);
1611 if (keepmain || strNE(name, "main")) {
1612 sv_catpvn(sv,name,namelen);
1615 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1619 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1621 const GV * const egv = GvEGVx(gv);
1623 PERL_ARGS_ASSERT_GV_EFULLNAME4;
1625 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1629 Perl_gv_check(pTHX_ const HV *stash)
1634 PERL_ARGS_ASSERT_GV_CHECK;
1636 if (!HvARRAY(stash))
1638 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1640 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1643 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1644 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
1646 if (hv != PL_defstash && hv != stash)
1647 gv_check(hv); /* nested package */
1649 else if (isALPHA(*HeKEY(entry))) {
1651 gv = MUTABLE_GV(HeVAL(entry));
1652 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1655 CopLINE_set(PL_curcop, GvLINE(gv));
1657 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1659 CopFILEGV(PL_curcop)
1660 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
1662 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1663 "Name \"%s::%s\" used only once: possible typo",
1664 HvNAME_get(stash), GvNAME(gv));
1671 Perl_newGVgen(pTHX_ const char *pack)
1675 PERL_ARGS_ASSERT_NEWGVGEN;
1677 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1681 /* hopefully this is only called on local symbol table entries */
1684 Perl_gp_ref(pTHX_ GP *gp)
1692 /* If the GP they asked for a reference to contains
1693 a method cache entry, clear it first, so that we
1694 don't infect them with our cached entry */
1695 SvREFCNT_dec(gp->gp_cv);
1704 Perl_gp_free(pTHX_ GV *gv)
1710 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
1712 if (gp->gp_refcnt == 0) {
1713 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
1714 "Attempt to free unreferenced glob pointers"
1715 pTHX__FORMAT pTHX__VALUE);
1718 if (--gp->gp_refcnt > 0) {
1719 if (gp->gp_egv == gv)
1726 /* Copy and null out all the glob slots, so destructors do not see
1728 HEK * const file_hek = gp->gp_file_hek;
1729 SV * const sv = gp->gp_sv;
1730 AV * const av = gp->gp_av;
1731 HV * const hv = gp->gp_hv;
1732 IO * const io = gp->gp_io;
1733 CV * const cv = gp->gp_cv;
1734 CV * const form = gp->gp_form;
1736 gp->gp_file_hek = NULL;
1745 unshare_hek(file_hek);
1749 /* FIXME - another reference loop GV -> symtab -> GV ?
1750 Somehow gp->gp_hv can end up pointing at freed garbage. */
1751 if (hv && SvTYPE(hv) == SVt_PVHV) {
1752 const char *hvname = HvNAME_get(hv);
1753 if (PL_stashcache && hvname)
1754 (void)hv_delete(PL_stashcache, hvname, HvNAMELEN_get(hv),
1762 if (!gp->gp_file_hek
1768 && !gp->gp_form) break;
1770 if (--attempts == 0) {
1772 "panic: gp_free failed to free glob pointer - "
1773 "something is repeatedly re-creating entries"
1783 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1785 AMT * const amtp = (AMT*)mg->mg_ptr;
1786 PERL_UNUSED_ARG(sv);
1788 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
1790 if (amtp && AMT_AMAGIC(amtp)) {
1792 for (i = 1; i < NofAMmeth; i++) {
1793 CV * const cv = amtp->table[i];
1795 SvREFCNT_dec(MUTABLE_SV(cv));
1796 amtp->table[i] = NULL;
1803 /* Updates and caches the CV's */
1805 * 1 on success and there is some overload
1806 * 0 if there is no overload
1807 * -1 if some error occurred and it couldn't croak
1811 Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
1814 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
1816 const struct mro_meta* stash_meta = HvMROMETA(stash);
1819 PERL_ARGS_ASSERT_GV_AMUPDATE;
1821 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
1823 const AMT * const amtp = (AMT*)mg->mg_ptr;
1824 if (amtp->was_ok_am == PL_amagic_generation
1825 && amtp->was_ok_sub == newgen) {
1826 return AMT_OVERLOADED(amtp) ? 1 : 0;
1828 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
1831 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1834 amt.was_ok_am = PL_amagic_generation;
1835 amt.was_ok_sub = newgen;
1836 amt.fallback = AMGfallNO;
1840 int filled = 0, have_ovl = 0;
1843 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1845 /* Try to find via inheritance. */
1846 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1847 SV * const sv = gv ? GvSV(gv) : NULL;
1851 lim = DESTROY_amg; /* Skip overloading entries. */
1852 #ifdef PERL_DONT_CREATE_GVSV
1854 NOOP; /* Equivalent to !SvTRUE and !SvOK */
1857 else if (SvTRUE(sv))
1858 amt.fallback=AMGfallYES;
1860 amt.fallback=AMGfallNEVER;
1862 for (i = 1; i < lim; i++)
1863 amt.table[i] = NULL;
1864 for (; i < NofAMmeth; i++) {
1865 const char * const cooky = PL_AMG_names[i];
1866 /* Human-readable form, for debugging: */
1867 const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1868 const STRLEN l = PL_AMG_namelens[i];
1870 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1871 cp, HvNAME_get(stash)) );
1872 /* don't fill the cache while looking up!
1873 Creation of inheritance stubs in intermediate packages may
1874 conflict with the logic of runtime method substitution.
1875 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1876 then we could have created stubs for "(+0" in A and C too.
1877 But if B overloads "bool", we may want to use it for
1878 numifying instead of C's "+0". */
1879 if (i >= DESTROY_amg)
1880 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1881 else /* Autoload taken care of below */
1882 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1884 if (gv && (cv = GvCV(gv))) {
1886 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1887 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1888 /* This is a hack to support autoloading..., while
1889 knowing *which* methods were declared as overloaded. */
1890 /* GvSV contains the name of the method. */
1892 SV *gvsv = GvSV(gv);
1894 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1895 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1896 (void*)GvSV(gv), cp, hvname) );
1897 if (!gvsv || !SvPOK(gvsv)
1898 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1901 /* Can be an import stub (created by "can"). */
1906 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1907 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1908 "in package \"%.256s\"",
1909 (GvCVGEN(gv) ? "Stub found while resolving"
1914 cv = GvCV(gv = ngv);
1916 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1917 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1918 GvNAME(CvGV(cv))) );
1920 if (i < DESTROY_amg)
1922 } else if (gv) { /* Autoloaded... */
1923 cv = MUTABLE_CV(gv);
1926 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
1929 AMT_AMAGIC_on(&amt);
1931 AMT_OVERLOADED_on(&amt);
1932 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
1933 (char*)&amt, sizeof(AMT));
1937 /* Here we have no table: */
1939 AMT_AMAGIC_off(&amt);
1940 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
1941 (char*)&amt, sizeof(AMTS));
1947 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1953 struct mro_meta* stash_meta;
1955 if (!stash || !HvNAME_get(stash))
1958 stash_meta = HvMROMETA(stash);
1959 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
1961 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
1964 /* If we're looking up a destructor to invoke, we must avoid
1965 * that Gv_AMupdate croaks, because we might be dying already */
1966 if (Gv_AMupdate(stash, cBOOL(id == DESTROY_amg)) == -1) {
1967 /* and if it didn't found a destructor, we fall back
1968 * to a simpler method that will only look for the
1969 * destructor instead of the whole magic */
1970 if (id == DESTROY_amg) {
1971 GV * const gv = gv_fetchmethod(stash, "DESTROY");
1977 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
1980 amtp = (AMT*)mg->mg_ptr;
1981 if ( amtp->was_ok_am != PL_amagic_generation
1982 || amtp->was_ok_sub != newgen )
1984 if (AMT_AMAGIC(amtp)) {
1985 CV * const ret = amtp->table[id];
1986 if (ret && isGV(ret)) { /* Autoloading stab */
1987 /* Passing it through may have resulted in a warning
1988 "Inherited AUTOLOAD for a non-method deprecated", since
1989 our caller is going through a function call, not a method call.
1990 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1991 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
2003 /* Implement tryAMAGICun_MG macro.
2004 Do get magic, then see if the stack arg is overloaded and if so call it.
2006 AMGf_set return the arg using SETs rather than assigning to
2008 AMGf_numeric apply sv_2num to the stack arg.
2012 Perl_try_amagic_un(pTHX_ int method, int flags) {
2016 SV* const arg = TOPs;
2020 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2021 AMGf_noright | AMGf_unary))) {
2022 if (flags & AMGf_set) {
2027 if (SvPADMY(TARG)) {
2028 sv_setsv(TARG, tmpsv);
2038 if ((flags & AMGf_numeric) && SvROK(arg))
2044 /* Implement tryAMAGICbin_MG macro.
2045 Do get magic, then see if the two stack args are overloaded and if so
2048 AMGf_set return the arg using SETs rather than assigning to
2050 AMGf_assign op may be called as mutator (eg +=)
2051 AMGf_numeric apply sv_2num to the stack arg.
2055 Perl_try_amagic_bin(pTHX_ int method, int flags) {
2058 SV* const left = TOPm1s;
2059 SV* const right = TOPs;
2065 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2066 SV * const tmpsv = amagic_call(left, right, method,
2067 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2069 if (flags & AMGf_set) {
2076 if (opASSIGN || SvPADMY(TARG)) {
2077 sv_setsv(TARG, tmpsv);
2087 if(left==right && SvGMAGICAL(left)) {
2088 SV * const left = sv_newmortal();
2090 /* Print the uninitialized warning now, so it includes the vari-
2093 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2094 sv_setsv_flags(left, &PL_sv_no, 0);
2096 else sv_setsv_flags(left, right, 0);
2099 if (flags & AMGf_numeric) {
2101 *(sp-1) = sv_2num(TOPm1s);
2103 *sp = sv_2num(right);
2109 Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2112 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2114 while (SvAMAGIC(ref) &&
2115 (tmpsv = amagic_call(ref, &PL_sv_undef, method,
2116 AMGf_noright | AMGf_unary))) {
2118 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2119 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2120 /* Bail out if it returns us the same reference. */
2125 return tmpsv ? tmpsv : ref;
2129 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
2134 CV **cvp=NULL, **ocvp=NULL;
2135 AMT *amtp=NULL, *oamtp=NULL;
2136 int off = 0, off1, lr = 0, notfound = 0;
2137 int postpr = 0, force_cpy = 0;
2138 int assign = AMGf_assign & flags;
2139 const int assignshift = assign ? 1 : 0;
2140 int use_default_op = 0;
2146 PERL_ARGS_ASSERT_AMAGIC_CALL;
2148 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
2149 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2151 if ( !lex_mask || !SvOK(lex_mask) )
2152 /* overloading lexically disabled */
2154 else if ( lex_mask && SvPOK(lex_mask) ) {
2155 /* we have an entry in the hints hash, check if method has been
2156 * masked by overloading.pm */
2158 const int offset = method / 8;
2159 const int bit = method % 8;
2160 char *pv = SvPV(lex_mask, len);
2162 /* Bit set, so this overloading operator is disabled */
2163 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2168 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
2169 && (stash = SvSTASH(SvRV(left)))
2170 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
2171 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
2172 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
2174 && ((cv = cvp[off=method+assignshift])
2175 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2181 cv = cvp[off=method])))) {
2182 lr = -1; /* Call method for left argument */
2184 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2187 /* look for substituted methods */
2188 /* In all the covered cases we should be called with assign==0. */
2192 if ((cv = cvp[off=add_ass_amg])
2193 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
2194 right = &PL_sv_yes; lr = -1; assign = 1;
2199 if ((cv = cvp[off = subtr_ass_amg])
2200 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
2201 right = &PL_sv_yes; lr = -1; assign = 1;
2205 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
2208 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
2211 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
2214 (void)((cv = cvp[off=bool__amg])
2215 || (cv = cvp[off=numer_amg])
2216 || (cv = cvp[off=string_amg]));
2223 * SV* ref causes confusion with the interpreter variable of
2226 SV* const tmpRef=SvRV(left);
2227 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
2229 * Just to be extra cautious. Maybe in some
2230 * additional cases sv_setsv is safe, too.
2232 SV* const newref = newSVsv(tmpRef);
2233 SvOBJECT_on(newref);
2234 /* As a bit of a source compatibility hack, SvAMAGIC() and
2235 friends dereference an RV, to behave the same was as when
2236 overloading was stored on the reference, not the referant.
2237 Hence we can't use SvAMAGIC_on()
2239 SvFLAGS(newref) |= SVf_AMAGIC;
2240 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
2246 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
2247 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
2248 SV* const nullsv=sv_2mortal(newSViv(0));
2250 SV* const lessp = amagic_call(left,nullsv,
2251 lt_amg,AMGf_noright);
2252 logic = SvTRUE(lessp);
2254 SV* const lessp = amagic_call(left,nullsv,
2255 ncmp_amg,AMGf_noright);
2256 logic = (SvNV(lessp) < 0);
2259 if (off==subtr_amg) {
2270 if ((cv = cvp[off=subtr_amg])) {
2272 left = sv_2mortal(newSViv(0));
2277 case iter_amg: /* XXXX Eventually should do to_gv. */
2278 case ftest_amg: /* XXXX Eventually should do to_gv. */
2281 return NULL; /* Delegate operation to standard mechanisms. */
2289 return left; /* Delegate operation to standard mechanisms. */
2294 if (!cv) goto not_found;
2295 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
2296 && (stash = SvSTASH(SvRV(right)))
2297 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
2298 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
2299 ? (amtp = (AMT*)mg->mg_ptr)->table
2301 && (cv = cvp[off=method])) { /* Method for right
2304 } else if (((cvp && amtp->fallback > AMGfallNEVER)
2305 || (ocvp && oamtp->fallback > AMGfallNEVER))
2306 && !(flags & AMGf_unary)) {
2307 /* We look for substitution for
2308 * comparison operations and
2310 if (method==concat_amg || method==concat_ass_amg
2311 || method==repeat_amg || method==repeat_ass_amg) {
2312 return NULL; /* Delegate operation to string conversion */
2334 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
2338 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
2348 not_found: /* No method found, either report or croak */
2356 return left; /* Delegate operation to standard mechanisms. */
2359 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
2360 notfound = 1; lr = -1;
2361 } else if (cvp && (cv=cvp[nomethod_amg])) {
2362 notfound = 1; lr = 1;
2363 } else if ((use_default_op =
2364 (!ocvp || oamtp->fallback >= AMGfallYES)
2365 && (!cvp || amtp->fallback >= AMGfallYES))
2367 /* Skip generating the "no method found" message. */
2371 if (off==-1) off=method;
2372 msg = sv_2mortal(Perl_newSVpvf(aTHX_
2373 "Operation \"%s\": no method found,%sargument %s%s%s%s",
2374 AMG_id2name(method + assignshift),
2375 (flags & AMGf_unary ? " " : "\n\tleft "),
2377 "in overloaded package ":
2378 "has no overloaded magic",
2380 HvNAME_get(SvSTASH(SvRV(left))):
2383 ",\n\tright argument in overloaded package ":
2386 : ",\n\tright argument has no overloaded magic"),
2388 HvNAME_get(SvSTASH(SvRV(right))):
2390 if (use_default_op) {
2391 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
2393 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
2397 force_cpy = force_cpy || assign;
2402 DEBUG_o(Perl_deb(aTHX_
2403 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
2405 method+assignshift==off? "" :
2407 method+assignshift==off? "" :
2408 AMG_id2name(method+assignshift),
2409 method+assignshift==off? "" : "\")",
2410 flags & AMGf_unary? "" :
2411 lr==1 ? " for right argument": " for left argument",
2412 flags & AMGf_unary? " for argument" : "",
2413 stash ? HvNAME_get(stash) : "null",
2414 fl? ",\n\tassignment variant used": "") );
2417 /* Since we use shallow copy during assignment, we need
2418 * to dublicate the contents, probably calling user-supplied
2419 * version of copy operator
2421 /* We need to copy in following cases:
2422 * a) Assignment form was called.
2423 * assignshift==1, assign==T, method + 1 == off
2424 * b) Increment or decrement, called directly.
2425 * assignshift==0, assign==0, method + 0 == off
2426 * c) Increment or decrement, translated to assignment add/subtr.
2427 * assignshift==0, assign==T,
2429 * d) Increment or decrement, translated to nomethod.
2430 * assignshift==0, assign==0,
2432 * e) Assignment form translated to nomethod.
2433 * assignshift==1, assign==T, method + 1 != off
2436 /* off is method, method+assignshift, or a result of opcode substitution.
2437 * In the latter case assignshift==0, so only notfound case is important.
2439 if (( (method + assignshift == off)
2440 && (assign || (method == inc_amg) || (method == dec_amg)))
2443 /* newSVsv does not behave as advertised, so we copy missing
2444 * information by hand */
2445 SV *tmpRef = SvRV(left);
2447 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
2448 SvRV_set(left, rv_copy);
2450 SvREFCNT_dec(tmpRef);
2458 const bool oldcatch = CATCH_GET;
2461 Zero(&myop, 1, BINOP);
2462 myop.op_last = (OP *) &myop;
2463 myop.op_next = NULL;
2464 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
2466 PUSHSTACKi(PERLSI_OVERLOAD);
2469 PL_op = (OP *) &myop;
2470 if (PERLDB_SUB && PL_curstash != PL_debstash)
2471 PL_op->op_private |= OPpENTERSUB_DB;
2473 Perl_pp_pushmark(aTHX);
2475 EXTEND(SP, notfound + 5);
2476 PUSHs(lr>0? right: left);
2477 PUSHs(lr>0? left: right);
2478 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
2480 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
2481 AMG_id2namelen(method + assignshift), SVs_TEMP));
2483 PUSHs(MUTABLE_SV(cv));
2486 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
2494 CATCH_SET(oldcatch);
2501 ans=SvIV(res)<=0; break;
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 SvSetSV(left,res); return left;
2521 ans=!SvTRUE(res); break;
2526 } else if (method==copy_amg) {
2528 Perl_croak(aTHX_ "Copy method did not return a reference");
2530 return SvREFCNT_inc(SvRV(res));
2538 =for apidoc is_gv_magical_sv
2540 Returns C<TRUE> if given the name of a magical GV.
2542 Currently only useful internally when determining if a GV should be
2543 created even in rvalue contexts.
2545 C<flags> is not used at present but available for future extension to
2546 allow selecting particular classes of magical variable.
2548 Currently assumes that C<name> is NUL terminated (as well as len being valid).
2549 This assumption is met by all callers within the perl core, which all pass
2550 pointers returned by SvPV.
2556 Perl_is_gv_magical_sv(pTHX_ SV *const name_sv, U32 flags)
2559 const char *const name = SvPV_const(name_sv, len);
2561 PERL_UNUSED_ARG(flags);
2562 PERL_ARGS_ASSERT_IS_GV_MAGICAL_SV;
2565 const char * const name1 = name + 1;
2568 if (len == 3 && name[1] == 'S' && name[2] == 'A')
2572 if (len == 8 && strEQ(name1, "VERLOAD"))
2576 if (len == 3 && name[1] == 'I' && name[2] == 'G')
2579 /* Using ${^...} variables is likely to be sufficiently rare that
2580 it seems sensible to avoid the space hit of also checking the
2582 case '\017': /* ${^OPEN} */
2583 if (strEQ(name1, "PEN"))
2586 case '\024': /* ${^TAINT} */
2587 if (strEQ(name1, "AINT"))
2590 case '\025': /* ${^UNICODE} */
2591 if (strEQ(name1, "NICODE"))
2593 if (strEQ(name1, "TF8LOCALE"))
2596 case '\027': /* ${^WARNING_BITS} */
2597 if (strEQ(name1, "ARNING_BITS"))
2610 const char *end = name + len;
2611 while (--end > name) {
2619 /* Because we're already assuming that name is NUL terminated
2620 below, we can treat an empty name as "\0" */
2646 case '\001': /* $^A */
2647 case '\003': /* $^C */
2648 case '\004': /* $^D */
2649 case '\005': /* $^E */
2650 case '\006': /* $^F */
2651 case '\010': /* $^H */
2652 case '\011': /* $^I, NOT \t in EBCDIC */
2653 case '\014': /* $^L */
2654 case '\016': /* $^N */
2655 case '\017': /* $^O */
2656 case '\020': /* $^P */
2657 case '\023': /* $^S */
2658 case '\024': /* $^T */
2659 case '\026': /* $^V */
2660 case '\027': /* $^W */
2680 Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
2685 PERL_ARGS_ASSERT_GV_NAME_SET;
2686 PERL_UNUSED_ARG(flags);
2689 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
2691 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
2692 unshare_hek(GvNAME_HEK(gv));
2695 PERL_HASH(hash, name, len);
2696 GvNAME_HEK(gv) = share_hek(name, len, hash);
2700 =for apidoc gv_try_downgrade
2702 If the typeglob C<gv> can be expressed more succinctly, by having
2703 something other than a real GV in its place in the stash, replace it
2704 with the optimised form. Basic requirements for this are that C<gv>
2705 is a real typeglob, is sufficiently ordinary, and is only referenced
2706 from its package. This function is meant to be used when a GV has been
2707 looked up in part to see what was there, causing upgrading, but based
2708 on what was found it turns out that the real GV isn't required after all.
2710 If C<gv> is a completely empty typeglob, it is deleted from the stash.
2712 If C<gv> is a typeglob containing only a sufficiently-ordinary constant
2713 sub, the typeglob is replaced with a scalar-reference placeholder that
2714 more compactly represents the same thing.
2720 Perl_gv_try_downgrade(pTHX_ GV *gv)
2726 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
2728 /* XXX Why and where does this leave dangling pointers during global
2730 if (PL_phase == PERL_PHASE_DESTRUCT) return;
2732 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
2733 !SvOBJECT(gv) && !SvREADONLY(gv) &&
2734 isGV_with_GP(gv) && GvGP(gv) &&
2735 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
2736 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
2737 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2739 if (SvMAGICAL(gv)) {
2741 /* only backref magic is allowed */
2742 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
2744 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
2745 if (mg->mg_type != PERL_MAGIC_backref)
2751 HEK *gvnhek = GvNAME_HEK(gv);
2752 (void)hv_delete(stash, HEK_KEY(gvnhek),
2753 HEK_UTF8(gvnhek) ? -HEK_LEN(gvnhek) : HEK_LEN(gvnhek), G_DISCARD);
2754 } else if (GvMULTI(gv) && cv &&
2755 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
2756 CvSTASH(cv) == stash && CvGV(cv) == gv &&
2757 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
2758 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
2759 (namehek = GvNAME_HEK(gv)) &&
2760 (gvp = hv_fetch(stash, HEK_KEY(namehek),
2761 HEK_LEN(namehek)*(HEK_UTF8(namehek) ? -1 : 1), 0)) &&
2763 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
2767 SvFLAGS(gv) = SVt_IV|SVf_ROK;
2768 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
2769 STRUCT_OFFSET(XPVIV, xiv_iv));
2770 SvRV_set(gv, value);
2776 * c-indentation-style: bsd
2778 * indent-tabs-mode: t
2781 * ex: set ts=8 sts=4 sw=4 noet: