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 sv_catpvn(varsv, name, len);
860 /* require_tie_mod() internal routine for requiring a module
861 * that implements the logic of automatic ties like %! and %-
863 * The "gv" parameter should be the glob.
864 * "varpv" holds the name of the var, used for error messages.
865 * "namesv" holds the module name. Its refcount will be decremented.
866 * "methpv" holds the method name to test for to check that things
867 * are working reasonably close to as expected.
868 * "flags": if flag & 1 then save the scalar before loading.
869 * For the protection of $! to work (it is set by this routine)
870 * the sv slot must already be magicalized.
873 S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
876 HV* stash = gv_stashsv(namesv, 0);
878 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
880 if (!stash || !(gv_fetchmethod(stash, methpv))) {
881 SV *module = newSVsv(namesv);
882 char varname = *varpv; /* varpv might be clobbered by load_module,
883 so save it. For the moment it's always
889 PUSHSTACKi(PERLSI_MAGIC);
890 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
894 stash = gv_stashsv(namesv, 0);
896 Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" is not available",
897 varname, SVfARG(namesv));
898 else if (!gv_fetchmethod(stash, methpv))
899 Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" does not support method %s",
900 varname, SVfARG(namesv), methpv);
902 SvREFCNT_dec(namesv);
907 =for apidoc gv_stashpv
909 Returns a pointer to the stash for a specified package. Uses C<strlen> to
910 determine the length of C<name>, then calls C<gv_stashpvn()>.
916 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
918 PERL_ARGS_ASSERT_GV_STASHPV;
919 return gv_stashpvn(name, strlen(name), create);
923 =for apidoc gv_stashpvn
925 Returns a pointer to the stash for a specified package. The C<namelen>
926 parameter indicates the length of the C<name>, in bytes. C<flags> is passed
927 to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
928 created if it does not already exist. If the package does not exist and
929 C<flags> is 0 (or any other setting that does not create packages) then NULL
937 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
943 U32 tmplen = namelen + 2;
945 PERL_ARGS_ASSERT_GV_STASHPVN;
947 if (tmplen <= sizeof smallbuf)
950 Newx(tmpbuf, tmplen, char);
951 Copy(name, tmpbuf, namelen, char);
952 tmpbuf[namelen] = ':';
953 tmpbuf[namelen+1] = ':';
954 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
955 if (tmpbuf != smallbuf)
961 assert(HvNAME_get(stash));
966 =for apidoc gv_stashsv
968 Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
974 Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
977 const char * const ptr = SvPV_const(sv,len);
979 PERL_ARGS_ASSERT_GV_STASHSV;
981 return gv_stashpvn(ptr, len, flags);
986 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
987 PERL_ARGS_ASSERT_GV_FETCHPV;
988 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
992 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
994 const char * const nambeg = SvPV_const(name, len);
995 PERL_ARGS_ASSERT_GV_FETCHSV;
996 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1000 S_gv_magicalize_isa(pTHX_ GV *gv)
1004 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1008 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1013 S_gv_magicalize_overload(pTHX_ GV *gv)
1017 PERL_ARGS_ASSERT_GV_MAGICALIZE_OVERLOAD;
1021 hv_magic(hv, NULL, PERL_MAGIC_overload);
1025 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
1026 const svtype sv_type)
1029 register const char *name = nambeg;
1030 register GV *gv = NULL;
1033 register const char *name_cursor;
1035 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
1036 const I32 no_expand = flags & GV_NOEXPAND;
1037 const I32 add = flags & ~GV_NOADD_MASK;
1038 const char *const name_end = nambeg + full_len;
1039 const char *const name_em1 = name_end - 1;
1042 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
1044 if (flags & GV_NOTQUAL) {
1045 /* Caller promised that there is no stash, so we can skip the check. */
1050 if (full_len > 2 && *name == '*' && isALPHA(name[1])) {
1051 /* accidental stringify on a GV? */
1055 for (name_cursor = name; name_cursor < name_end; name_cursor++) {
1056 if ((*name_cursor == ':' && name_cursor < name_em1
1057 && name_cursor[1] == ':')
1058 || (*name_cursor == '\'' && name_cursor[1]))
1061 stash = PL_defstash;
1062 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
1065 len = name_cursor - name;
1068 if (*name_cursor == ':') {
1073 Newx(tmpbuf, len+2, char);
1074 Copy(name, tmpbuf, len, char);
1075 tmpbuf[len++] = ':';
1076 tmpbuf[len++] = ':';
1079 gvp = (GV**)hv_fetch(stash, key, len, add);
1080 gv = gvp ? *gvp : NULL;
1081 if (gv && gv != (const GV *)&PL_sv_undef) {
1082 if (SvTYPE(gv) != SVt_PVGV)
1083 gv_init(gv, stash, key, len, (add & GV_ADDMULTI));
1089 if (!gv || gv == (const GV *)&PL_sv_undef)
1092 if (!(stash = GvHV(gv)))
1094 stash = GvHV(gv) = newHV();
1095 if (!HvNAME_get(stash)) {
1096 hv_name_set(stash, nambeg, name_cursor-nambeg, 0);
1097 /* If the containing stash has multiple effective
1098 names, see that this one gets them, too. */
1099 if (HvAUX(GvSTASH(gv))->xhv_name_count)
1100 mro_package_moved(stash, NULL, gv, 1);
1103 else if (!HvNAME_get(stash))
1104 hv_name_set(stash, nambeg, name_cursor - nambeg, 0);
1107 if (*name_cursor == ':')
1111 if (name == name_end)
1113 ? gv : MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1116 len = name_cursor - name;
1118 /* No stash in name, so see how we can default */
1122 if (len && isIDFIRST_lazy(name)) {
1123 bool global = FALSE;
1131 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1132 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1133 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
1137 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1142 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1143 && name[3] == 'I' && name[4] == 'N')
1147 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1148 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1149 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
1153 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1154 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1161 stash = PL_defstash;
1162 else if (IN_PERL_COMPILETIME) {
1163 stash = PL_curstash;
1164 if (add && (PL_hints & HINT_STRICT_VARS) &&
1165 sv_type != SVt_PVCV &&
1166 sv_type != SVt_PVGV &&
1167 sv_type != SVt_PVFM &&
1168 sv_type != SVt_PVIO &&
1169 !(len == 1 && sv_type == SVt_PV &&
1170 (*name == 'a' || *name == 'b')) )
1172 gvp = (GV**)hv_fetch(stash,name,len,0);
1174 *gvp == (const GV *)&PL_sv_undef ||
1175 SvTYPE(*gvp) != SVt_PVGV)
1179 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1180 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1181 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1183 /* diag_listed_as: Variable "%s" is not imported%s */
1185 aTHX_ packWARN(WARN_MISC),
1186 "Variable \"%c%s\" is not imported",
1187 sv_type == SVt_PVAV ? '@' :
1188 sv_type == SVt_PVHV ? '%' : '$',
1192 aTHX_ packWARN(WARN_MISC),
1193 "\t(Did you mean &%s instead?)\n", name
1200 stash = CopSTASH(PL_curcop);
1203 stash = PL_defstash;
1206 /* By this point we should have a stash and a name */
1210 SV * const err = Perl_mess(aTHX_
1211 "Global symbol \"%s%s\" requires explicit package name",
1212 (sv_type == SVt_PV ? "$"
1213 : sv_type == SVt_PVAV ? "@"
1214 : sv_type == SVt_PVHV ? "%"
1217 if (USE_UTF8_IN_NAMES)
1220 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1222 /* symbol table under destruction */
1231 if (!SvREFCNT(stash)) /* symbol table under destruction */
1234 gvp = (GV**)hv_fetch(stash,name,len,add);
1235 if (!gvp || *gvp == (const GV *)&PL_sv_undef)
1238 if (SvTYPE(gv) == SVt_PVGV) {
1241 gv_init_sv(gv, sv_type);
1242 if (len == 1 && (sv_type == SVt_PVHV || sv_type == SVt_PVGV)) {
1244 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1245 else if (*name == '-' || *name == '+')
1246 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
1248 else if (len == 3 && sv_type == SVt_PVAV
1249 && strnEQ(name, "ISA", 3)
1250 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
1251 gv_magicalize_isa(gv);
1254 } else if (no_init) {
1256 } else if (no_expand && SvROK(gv)) {
1260 /* Adding a new symbol.
1261 Unless of course there was already something non-GV here, in which case
1262 we want to behave as if there was always a GV here, containing some sort
1264 Otherwise we run the risk of creating things like GvIO, which can cause
1265 subtle bugs. eg the one that tripped up SQL::Translator */
1267 faking_it = SvOK(gv);
1269 if (add & GV_ADDWARN)
1270 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
1271 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
1272 gv_init_sv(gv, faking_it ? SVt_PVCV : sv_type);
1274 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
1275 : (PL_dowarn & G_WARN_ON ) ) )
1278 /* set up magic where warranted */
1279 if (stash != PL_defstash) { /* not the main stash */
1280 /* We only have to check for four names here: EXPORT, ISA, OVERLOAD
1281 and VERSION. All the others apply only to the main stash. */
1283 const char * const name2 = name + 1;
1286 if (strnEQ(name2, "XPORT", 5))
1290 if (strEQ(name2, "SA"))
1291 gv_magicalize_isa(gv);
1294 if (strEQ(name2, "VERLOAD"))
1295 gv_magicalize_overload(gv);
1298 if (strEQ(name2, "ERSION"))
1308 /* Nothing else to do.
1309 The compiler will probably turn the switch statement into a
1310 branch table. Make sure we avoid even that small overhead for
1311 the common case of lower case variable names. */
1315 const char * const name2 = name + 1;
1318 if (strEQ(name2, "RGV")) {
1319 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1321 else if (strEQ(name2, "RGVOUT")) {
1326 if (strnEQ(name2, "XPORT", 5))
1330 if (strEQ(name2, "SA")) {
1331 gv_magicalize_isa(gv);
1335 if (strEQ(name2, "VERLOAD")) {
1336 gv_magicalize_overload(gv);
1340 if (strEQ(name2, "IG")) {
1343 if (!PL_psig_name) {
1344 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
1345 Newxz(PL_psig_pend, SIG_SIZE, int);
1346 PL_psig_ptr = PL_psig_name + SIG_SIZE;
1348 /* I think that the only way to get here is to re-use an
1349 embedded perl interpreter, where the previous
1350 use didn't clean up fully because
1351 PL_perl_destruct_level was 0. I'm not sure that we
1352 "support" that, in that I suspect in that scenario
1353 there are sufficient other garbage values left in the
1354 interpreter structure that something else will crash
1355 before we get here. I suspect that this is one of
1356 those "doctor, it hurts when I do this" bugs. */
1357 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
1358 Zero(PL_psig_pend, SIG_SIZE, int);
1362 hv_magic(hv, NULL, PERL_MAGIC_sig);
1363 for (i = 1; i < SIG_SIZE; i++) {
1364 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1366 sv_setsv(*init, &PL_sv_undef);
1371 if (strEQ(name2, "ERSION"))
1374 case '\003': /* $^CHILD_ERROR_NATIVE */
1375 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1378 case '\005': /* $^ENCODING */
1379 if (strEQ(name2, "NCODING"))
1382 case '\007': /* $^GLOBAL_PHASE */
1383 if (strEQ(name2, "LOBAL_PHASE"))
1386 case '\015': /* $^MATCH */
1387 if (strEQ(name2, "ATCH"))
1389 case '\017': /* $^OPEN */
1390 if (strEQ(name2, "PEN"))
1393 case '\020': /* $^PREMATCH $^POSTMATCH */
1394 if (strEQ(name2, "REMATCH") || strEQ(name2, "OSTMATCH"))
1397 case '\024': /* ${^TAINT} */
1398 if (strEQ(name2, "AINT"))
1401 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1402 if (strEQ(name2, "NICODE"))
1404 if (strEQ(name2, "TF8LOCALE"))
1406 if (strEQ(name2, "TF8CACHE"))
1409 case '\027': /* $^WARNING_BITS */
1410 if (strEQ(name2, "ARNING_BITS"))
1423 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1425 /* This snippet is taken from is_gv_magical */
1426 const char *end = name + len;
1427 while (--end > name) {
1428 if (!isDIGIT(*end)) return gv;
1435 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1436 be case '\0' in this switch statement (ie a default case) */
1442 sv_type == SVt_PVAV ||
1443 sv_type == SVt_PVHV ||
1444 sv_type == SVt_PVCV ||
1445 sv_type == SVt_PVFM ||
1448 PL_sawampersand = TRUE;
1452 sv_setpv(GvSVn(gv),PL_chopset);
1456 #ifdef COMPLEX_STATUS
1457 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1463 /* If %! has been used, automatically load Errno.pm. */
1465 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1467 /* magicalization must be done before require_tie_mod is called */
1468 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1469 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1474 GvMULTI_on(gv); /* no used once warnings here */
1476 AV* const av = GvAVn(gv);
1477 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
1479 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
1480 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1482 SvREADONLY_on(GvSVn(gv));
1485 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1486 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
1492 if (sv_type == SVt_PV)
1493 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1494 "$%c is no longer supported", *name);
1497 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1500 case '\010': /* $^H */
1502 HV *const hv = GvHVn(gv);
1503 hv_magic(hv, NULL, PERL_MAGIC_hints);
1506 case '\023': /* $^S */
1508 SvREADONLY_on(GvSVn(gv));
1532 case '\001': /* $^A */
1533 case '\003': /* $^C */
1534 case '\004': /* $^D */
1535 case '\005': /* $^E */
1536 case '\006': /* $^F */
1537 case '\011': /* $^I, NOT \t in EBCDIC */
1538 case '\016': /* $^N */
1539 case '\017': /* $^O */
1540 case '\020': /* $^P */
1541 case '\024': /* $^T */
1542 case '\027': /* $^W */
1544 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1547 case '\014': /* $^L */
1548 sv_setpvs(GvSVn(gv),"\f");
1549 PL_formfeed = GvSVn(gv);
1552 sv_setpvs(GvSVn(gv),"\034");
1556 SV * const sv = GvSVn(gv);
1557 if (!sv_derived_from(PL_patchlevel, "version"))
1558 upg_version(PL_patchlevel, TRUE);
1559 GvSV(gv) = vnumify(PL_patchlevel);
1560 SvREADONLY_on(GvSV(gv));
1564 case '\026': /* $^V */
1566 SV * const sv = GvSVn(gv);
1567 GvSV(gv) = new_version(PL_patchlevel);
1568 SvREADONLY_on(GvSV(gv));
1578 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1582 const HV * const hv = GvSTASH(gv);
1584 PERL_ARGS_ASSERT_GV_FULLNAME4;
1590 sv_setpv(sv, prefix ? prefix : "");
1592 name = HvNAME_get(hv);
1594 namelen = HvNAMELEN_get(hv);
1600 if (keepmain || strNE(name, "main")) {
1601 sv_catpvn(sv,name,namelen);
1604 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1608 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1610 const GV * const egv = GvEGVx(gv);
1612 PERL_ARGS_ASSERT_GV_EFULLNAME4;
1614 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1618 Perl_gv_check(pTHX_ const HV *stash)
1623 PERL_ARGS_ASSERT_GV_CHECK;
1625 if (!HvARRAY(stash))
1627 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1629 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1632 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1633 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
1635 if (hv != PL_defstash && hv != stash)
1636 gv_check(hv); /* nested package */
1638 else if (isALPHA(*HeKEY(entry))) {
1640 gv = MUTABLE_GV(HeVAL(entry));
1641 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1644 CopLINE_set(PL_curcop, GvLINE(gv));
1646 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1648 CopFILEGV(PL_curcop)
1649 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
1651 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1652 "Name \"%s::%s\" used only once: possible typo",
1653 HvNAME_get(stash), GvNAME(gv));
1660 Perl_newGVgen(pTHX_ const char *pack)
1664 PERL_ARGS_ASSERT_NEWGVGEN;
1666 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1670 /* hopefully this is only called on local symbol table entries */
1673 Perl_gp_ref(pTHX_ GP *gp)
1681 /* If the GP they asked for a reference to contains
1682 a method cache entry, clear it first, so that we
1683 don't infect them with our cached entry */
1684 SvREFCNT_dec(gp->gp_cv);
1693 Perl_gp_free(pTHX_ GV *gv)
1699 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
1701 if (gp->gp_refcnt == 0) {
1702 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
1703 "Attempt to free unreferenced glob pointers"
1704 pTHX__FORMAT pTHX__VALUE);
1707 if (--gp->gp_refcnt > 0) {
1708 if (gp->gp_egv == gv)
1715 /* Copy and null out all the glob slots, so destructors do not see
1717 HEK * const file_hek = gp->gp_file_hek;
1718 SV * const sv = gp->gp_sv;
1719 AV * const av = gp->gp_av;
1720 HV * const hv = gp->gp_hv;
1721 IO * const io = gp->gp_io;
1722 CV * const cv = gp->gp_cv;
1723 CV * const form = gp->gp_form;
1725 gp->gp_file_hek = NULL;
1734 unshare_hek(file_hek);
1738 /* FIXME - another reference loop GV -> symtab -> GV ?
1739 Somehow gp->gp_hv can end up pointing at freed garbage. */
1740 if (hv && SvTYPE(hv) == SVt_PVHV) {
1741 const char *hvname = HvNAME_get(hv);
1742 if (PL_stashcache && hvname)
1743 (void)hv_delete(PL_stashcache, hvname, HvNAMELEN_get(hv),
1751 if (!gp->gp_file_hek
1757 && !gp->gp_form) break;
1759 if (--attempts == 0) {
1761 "panic: gp_free failed to free glob pointer - "
1762 "something is repeatedly re-creating entries"
1772 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1774 AMT * const amtp = (AMT*)mg->mg_ptr;
1775 PERL_UNUSED_ARG(sv);
1777 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
1779 if (amtp && AMT_AMAGIC(amtp)) {
1781 for (i = 1; i < NofAMmeth; i++) {
1782 CV * const cv = amtp->table[i];
1784 SvREFCNT_dec(MUTABLE_SV(cv));
1785 amtp->table[i] = NULL;
1792 /* Updates and caches the CV's */
1794 * 1 on success and there is some overload
1795 * 0 if there is no overload
1796 * -1 if some error occurred and it couldn't croak
1800 Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
1803 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
1805 const struct mro_meta* stash_meta = HvMROMETA(stash);
1808 PERL_ARGS_ASSERT_GV_AMUPDATE;
1810 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
1812 const AMT * const amtp = (AMT*)mg->mg_ptr;
1813 if (amtp->was_ok_am == PL_amagic_generation
1814 && amtp->was_ok_sub == newgen) {
1815 return AMT_OVERLOADED(amtp) ? 1 : 0;
1817 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
1820 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1823 amt.was_ok_am = PL_amagic_generation;
1824 amt.was_ok_sub = newgen;
1825 amt.fallback = AMGfallNO;
1829 int filled = 0, have_ovl = 0;
1832 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1834 /* Try to find via inheritance. */
1835 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1836 SV * const sv = gv ? GvSV(gv) : NULL;
1840 lim = DESTROY_amg; /* Skip overloading entries. */
1841 #ifdef PERL_DONT_CREATE_GVSV
1843 NOOP; /* Equivalent to !SvTRUE and !SvOK */
1846 else if (SvTRUE(sv))
1847 amt.fallback=AMGfallYES;
1849 amt.fallback=AMGfallNEVER;
1851 for (i = 1; i < lim; i++)
1852 amt.table[i] = NULL;
1853 for (; i < NofAMmeth; i++) {
1854 const char * const cooky = PL_AMG_names[i];
1855 /* Human-readable form, for debugging: */
1856 const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1857 const STRLEN l = PL_AMG_namelens[i];
1859 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1860 cp, HvNAME_get(stash)) );
1861 /* don't fill the cache while looking up!
1862 Creation of inheritance stubs in intermediate packages may
1863 conflict with the logic of runtime method substitution.
1864 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1865 then we could have created stubs for "(+0" in A and C too.
1866 But if B overloads "bool", we may want to use it for
1867 numifying instead of C's "+0". */
1868 if (i >= DESTROY_amg)
1869 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1870 else /* Autoload taken care of below */
1871 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1873 if (gv && (cv = GvCV(gv))) {
1875 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1876 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1877 /* This is a hack to support autoloading..., while
1878 knowing *which* methods were declared as overloaded. */
1879 /* GvSV contains the name of the method. */
1881 SV *gvsv = GvSV(gv);
1883 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1884 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1885 (void*)GvSV(gv), cp, hvname) );
1886 if (!gvsv || !SvPOK(gvsv)
1887 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1890 /* Can be an import stub (created by "can"). */
1895 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1896 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1897 "in package \"%.256s\"",
1898 (GvCVGEN(gv) ? "Stub found while resolving"
1903 cv = GvCV(gv = ngv);
1905 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1906 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1907 GvNAME(CvGV(cv))) );
1909 if (i < DESTROY_amg)
1911 } else if (gv) { /* Autoloaded... */
1912 cv = MUTABLE_CV(gv);
1915 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
1918 AMT_AMAGIC_on(&amt);
1920 AMT_OVERLOADED_on(&amt);
1921 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
1922 (char*)&amt, sizeof(AMT));
1926 /* Here we have no table: */
1928 AMT_AMAGIC_off(&amt);
1929 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
1930 (char*)&amt, sizeof(AMTS));
1936 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1942 struct mro_meta* stash_meta;
1944 if (!stash || !HvNAME_get(stash))
1947 stash_meta = HvMROMETA(stash);
1948 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
1950 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
1953 /* If we're looking up a destructor to invoke, we must avoid
1954 * that Gv_AMupdate croaks, because we might be dying already */
1955 if (Gv_AMupdate(stash, cBOOL(id == DESTROY_amg)) == -1) {
1956 /* and if it didn't found a destructor, we fall back
1957 * to a simpler method that will only look for the
1958 * destructor instead of the whole magic */
1959 if (id == DESTROY_amg) {
1960 GV * const gv = gv_fetchmethod(stash, "DESTROY");
1966 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
1969 amtp = (AMT*)mg->mg_ptr;
1970 if ( amtp->was_ok_am != PL_amagic_generation
1971 || amtp->was_ok_sub != newgen )
1973 if (AMT_AMAGIC(amtp)) {
1974 CV * const ret = amtp->table[id];
1975 if (ret && isGV(ret)) { /* Autoloading stab */
1976 /* Passing it through may have resulted in a warning
1977 "Inherited AUTOLOAD for a non-method deprecated", since
1978 our caller is going through a function call, not a method call.
1979 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1980 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1992 /* Implement tryAMAGICun_MG macro.
1993 Do get magic, then see if the stack arg is overloaded and if so call it.
1995 AMGf_set return the arg using SETs rather than assigning to
1997 AMGf_numeric apply sv_2num to the stack arg.
2001 Perl_try_amagic_un(pTHX_ int method, int flags) {
2005 SV* const arg = TOPs;
2009 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2010 AMGf_noright | AMGf_unary))) {
2011 if (flags & AMGf_set) {
2016 if (SvPADMY(TARG)) {
2017 sv_setsv(TARG, tmpsv);
2027 if ((flags & AMGf_numeric) && SvROK(arg))
2033 /* Implement tryAMAGICbin_MG macro.
2034 Do get magic, then see if the two stack args are overloaded and if so
2037 AMGf_set return the arg using SETs rather than assigning to
2039 AMGf_assign op may be called as mutator (eg +=)
2040 AMGf_numeric apply sv_2num to the stack arg.
2044 Perl_try_amagic_bin(pTHX_ int method, int flags) {
2047 SV* const left = TOPm1s;
2048 SV* const right = TOPs;
2054 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2055 SV * const tmpsv = amagic_call(left, right, method,
2056 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2058 if (flags & AMGf_set) {
2065 if (opASSIGN || SvPADMY(TARG)) {
2066 sv_setsv(TARG, tmpsv);
2076 if (flags & AMGf_numeric) {
2078 *(sp-1) = sv_2num(left);
2080 *sp = sv_2num(right);
2086 Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2089 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2091 while (SvAMAGIC(ref) &&
2092 (tmpsv = amagic_call(ref, &PL_sv_undef, method,
2093 AMGf_noright | AMGf_unary))) {
2095 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2096 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2097 /* Bail out if it returns us the same reference. */
2102 return tmpsv ? tmpsv : ref;
2106 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
2111 CV **cvp=NULL, **ocvp=NULL;
2112 AMT *amtp=NULL, *oamtp=NULL;
2113 int off = 0, off1, lr = 0, notfound = 0;
2114 int postpr = 0, force_cpy = 0;
2115 int assign = AMGf_assign & flags;
2116 const int assignshift = assign ? 1 : 0;
2117 int use_default_op = 0;
2123 PERL_ARGS_ASSERT_AMAGIC_CALL;
2125 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
2126 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2128 if ( !lex_mask || !SvOK(lex_mask) )
2129 /* overloading lexically disabled */
2131 else if ( lex_mask && SvPOK(lex_mask) ) {
2132 /* we have an entry in the hints hash, check if method has been
2133 * masked by overloading.pm */
2135 const int offset = method / 8;
2136 const int bit = method % 8;
2137 char *pv = SvPV(lex_mask, len);
2139 /* Bit set, so this overloading operator is disabled */
2140 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2145 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
2146 && (stash = SvSTASH(SvRV(left)))
2147 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
2148 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
2149 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
2151 && ((cv = cvp[off=method+assignshift])
2152 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2158 cv = cvp[off=method])))) {
2159 lr = -1; /* Call method for left argument */
2161 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2164 /* look for substituted methods */
2165 /* In all the covered cases we should be called with assign==0. */
2169 if ((cv = cvp[off=add_ass_amg])
2170 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
2171 right = &PL_sv_yes; lr = -1; assign = 1;
2176 if ((cv = cvp[off = subtr_ass_amg])
2177 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
2178 right = &PL_sv_yes; lr = -1; assign = 1;
2182 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
2185 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
2188 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
2191 (void)((cv = cvp[off=bool__amg])
2192 || (cv = cvp[off=numer_amg])
2193 || (cv = cvp[off=string_amg]));
2200 * SV* ref causes confusion with the interpreter variable of
2203 SV* const tmpRef=SvRV(left);
2204 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
2206 * Just to be extra cautious. Maybe in some
2207 * additional cases sv_setsv is safe, too.
2209 SV* const newref = newSVsv(tmpRef);
2210 SvOBJECT_on(newref);
2211 /* As a bit of a source compatibility hack, SvAMAGIC() and
2212 friends dereference an RV, to behave the same was as when
2213 overloading was stored on the reference, not the referant.
2214 Hence we can't use SvAMAGIC_on()
2216 SvFLAGS(newref) |= SVf_AMAGIC;
2217 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
2223 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
2224 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
2225 SV* const nullsv=sv_2mortal(newSViv(0));
2227 SV* const lessp = amagic_call(left,nullsv,
2228 lt_amg,AMGf_noright);
2229 logic = SvTRUE(lessp);
2231 SV* const lessp = amagic_call(left,nullsv,
2232 ncmp_amg,AMGf_noright);
2233 logic = (SvNV(lessp) < 0);
2236 if (off==subtr_amg) {
2247 if ((cv = cvp[off=subtr_amg])) {
2249 left = sv_2mortal(newSViv(0));
2254 case iter_amg: /* XXXX Eventually should do to_gv. */
2255 case ftest_amg: /* XXXX Eventually should do to_gv. */
2258 return NULL; /* Delegate operation to standard mechanisms. */
2266 return left; /* Delegate operation to standard mechanisms. */
2271 if (!cv) goto not_found;
2272 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
2273 && (stash = SvSTASH(SvRV(right)))
2274 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
2275 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
2276 ? (amtp = (AMT*)mg->mg_ptr)->table
2278 && (cv = cvp[off=method])) { /* Method for right
2281 } else if (((cvp && amtp->fallback > AMGfallNEVER)
2282 || (ocvp && oamtp->fallback > AMGfallNEVER))
2283 && !(flags & AMGf_unary)) {
2284 /* We look for substitution for
2285 * comparison operations and
2287 if (method==concat_amg || method==concat_ass_amg
2288 || method==repeat_amg || method==repeat_ass_amg) {
2289 return NULL; /* Delegate operation to string conversion */
2311 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
2315 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
2325 not_found: /* No method found, either report or croak */
2333 return left; /* Delegate operation to standard mechanisms. */
2336 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
2337 notfound = 1; lr = -1;
2338 } else if (cvp && (cv=cvp[nomethod_amg])) {
2339 notfound = 1; lr = 1;
2340 } else if ((use_default_op =
2341 (!ocvp || oamtp->fallback >= AMGfallYES)
2342 && (!cvp || amtp->fallback >= AMGfallYES))
2344 /* Skip generating the "no method found" message. */
2348 if (off==-1) off=method;
2349 msg = sv_2mortal(Perl_newSVpvf(aTHX_
2350 "Operation \"%s\": no method found,%sargument %s%s%s%s",
2351 AMG_id2name(method + assignshift),
2352 (flags & AMGf_unary ? " " : "\n\tleft "),
2354 "in overloaded package ":
2355 "has no overloaded magic",
2357 HvNAME_get(SvSTASH(SvRV(left))):
2360 ",\n\tright argument in overloaded package ":
2363 : ",\n\tright argument has no overloaded magic"),
2365 HvNAME_get(SvSTASH(SvRV(right))):
2367 if (use_default_op) {
2368 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
2370 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
2374 force_cpy = force_cpy || assign;
2379 DEBUG_o(Perl_deb(aTHX_
2380 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
2382 method+assignshift==off? "" :
2384 method+assignshift==off? "" :
2385 AMG_id2name(method+assignshift),
2386 method+assignshift==off? "" : "\")",
2387 flags & AMGf_unary? "" :
2388 lr==1 ? " for right argument": " for left argument",
2389 flags & AMGf_unary? " for argument" : "",
2390 stash ? HvNAME_get(stash) : "null",
2391 fl? ",\n\tassignment variant used": "") );
2394 /* Since we use shallow copy during assignment, we need
2395 * to dublicate the contents, probably calling user-supplied
2396 * version of copy operator
2398 /* We need to copy in following cases:
2399 * a) Assignment form was called.
2400 * assignshift==1, assign==T, method + 1 == off
2401 * b) Increment or decrement, called directly.
2402 * assignshift==0, assign==0, method + 0 == off
2403 * c) Increment or decrement, translated to assignment add/subtr.
2404 * assignshift==0, assign==T,
2406 * d) Increment or decrement, translated to nomethod.
2407 * assignshift==0, assign==0,
2409 * e) Assignment form translated to nomethod.
2410 * assignshift==1, assign==T, method + 1 != off
2413 /* off is method, method+assignshift, or a result of opcode substitution.
2414 * In the latter case assignshift==0, so only notfound case is important.
2416 if (( (method + assignshift == off)
2417 && (assign || (method == inc_amg) || (method == dec_amg)))
2420 /* newSVsv does not behave as advertised, so we copy missing
2421 * information by hand */
2422 SV *tmpRef = SvRV(left);
2424 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
2425 SvRV_set(left, rv_copy);
2427 SvREFCNT_dec(tmpRef);
2435 const bool oldcatch = CATCH_GET;
2438 Zero(&myop, 1, BINOP);
2439 myop.op_last = (OP *) &myop;
2440 myop.op_next = NULL;
2441 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
2443 PUSHSTACKi(PERLSI_OVERLOAD);
2446 PL_op = (OP *) &myop;
2447 if (PERLDB_SUB && PL_curstash != PL_debstash)
2448 PL_op->op_private |= OPpENTERSUB_DB;
2450 Perl_pp_pushmark(aTHX);
2452 EXTEND(SP, notfound + 5);
2453 PUSHs(lr>0? right: left);
2454 PUSHs(lr>0? left: right);
2455 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
2457 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
2458 AMG_id2namelen(method + assignshift), SVs_TEMP));
2460 PUSHs(MUTABLE_SV(cv));
2463 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
2471 CATCH_SET(oldcatch);
2478 ans=SvIV(res)<=0; break;
2481 ans=SvIV(res)<0; break;
2484 ans=SvIV(res)>=0; break;
2487 ans=SvIV(res)>0; break;
2490 ans=SvIV(res)==0; break;
2493 ans=SvIV(res)!=0; break;
2496 SvSetSV(left,res); return left;
2498 ans=!SvTRUE(res); break;
2503 } else if (method==copy_amg) {
2505 Perl_croak(aTHX_ "Copy method did not return a reference");
2507 return SvREFCNT_inc(SvRV(res));
2515 =for apidoc is_gv_magical_sv
2517 Returns C<TRUE> if given the name of a magical GV.
2519 Currently only useful internally when determining if a GV should be
2520 created even in rvalue contexts.
2522 C<flags> is not used at present but available for future extension to
2523 allow selecting particular classes of magical variable.
2525 Currently assumes that C<name> is NUL terminated (as well as len being valid).
2526 This assumption is met by all callers within the perl core, which all pass
2527 pointers returned by SvPV.
2533 Perl_is_gv_magical_sv(pTHX_ SV *const name_sv, U32 flags)
2536 const char *const name = SvPV_const(name_sv, len);
2538 PERL_UNUSED_ARG(flags);
2539 PERL_ARGS_ASSERT_IS_GV_MAGICAL_SV;
2542 const char * const name1 = name + 1;
2545 if (len == 3 && name[1] == 'S' && name[2] == 'A')
2549 if (len == 8 && strEQ(name1, "VERLOAD"))
2553 if (len == 3 && name[1] == 'I' && name[2] == 'G')
2556 /* Using ${^...} variables is likely to be sufficiently rare that
2557 it seems sensible to avoid the space hit of also checking the
2559 case '\017': /* ${^OPEN} */
2560 if (strEQ(name1, "PEN"))
2563 case '\024': /* ${^TAINT} */
2564 if (strEQ(name1, "AINT"))
2567 case '\025': /* ${^UNICODE} */
2568 if (strEQ(name1, "NICODE"))
2570 if (strEQ(name1, "TF8LOCALE"))
2573 case '\027': /* ${^WARNING_BITS} */
2574 if (strEQ(name1, "ARNING_BITS"))
2587 const char *end = name + len;
2588 while (--end > name) {
2596 /* Because we're already assuming that name is NUL terminated
2597 below, we can treat an empty name as "\0" */
2623 case '\001': /* $^A */
2624 case '\003': /* $^C */
2625 case '\004': /* $^D */
2626 case '\005': /* $^E */
2627 case '\006': /* $^F */
2628 case '\010': /* $^H */
2629 case '\011': /* $^I, NOT \t in EBCDIC */
2630 case '\014': /* $^L */
2631 case '\016': /* $^N */
2632 case '\017': /* $^O */
2633 case '\020': /* $^P */
2634 case '\023': /* $^S */
2635 case '\024': /* $^T */
2636 case '\026': /* $^V */
2637 case '\027': /* $^W */
2657 Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
2662 PERL_ARGS_ASSERT_GV_NAME_SET;
2663 PERL_UNUSED_ARG(flags);
2666 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
2668 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
2669 unshare_hek(GvNAME_HEK(gv));
2672 PERL_HASH(hash, name, len);
2673 GvNAME_HEK(gv) = share_hek(name, len, hash);
2677 =for apidoc gv_try_downgrade
2679 If the typeglob C<gv> can be expressed more succinctly, by having
2680 something other than a real GV in its place in the stash, replace it
2681 with the optimised form. Basic requirements for this are that C<gv>
2682 is a real typeglob, is sufficiently ordinary, and is only referenced
2683 from its package. This function is meant to be used when a GV has been
2684 looked up in part to see what was there, causing upgrading, but based
2685 on what was found it turns out that the real GV isn't required after all.
2687 If C<gv> is a completely empty typeglob, it is deleted from the stash.
2689 If C<gv> is a typeglob containing only a sufficiently-ordinary constant
2690 sub, the typeglob is replaced with a scalar-reference placeholder that
2691 more compactly represents the same thing.
2697 Perl_gv_try_downgrade(pTHX_ GV *gv)
2703 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
2705 /* XXX Why and where does this leave dangling pointers during global
2707 if (PL_phase == PERL_PHASE_DESTRUCT) return;
2709 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
2710 !SvOBJECT(gv) && !SvREADONLY(gv) &&
2711 isGV_with_GP(gv) && GvGP(gv) &&
2712 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
2713 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
2714 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2716 if (SvMAGICAL(gv)) {
2718 /* only backref magic is allowed */
2719 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
2721 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
2722 if (mg->mg_type != PERL_MAGIC_backref)
2728 HEK *gvnhek = GvNAME_HEK(gv);
2729 (void)hv_delete(stash, HEK_KEY(gvnhek),
2730 HEK_UTF8(gvnhek) ? -HEK_LEN(gvnhek) : HEK_LEN(gvnhek), G_DISCARD);
2731 } else if (GvMULTI(gv) && cv &&
2732 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
2733 CvSTASH(cv) == stash && CvGV(cv) == gv &&
2734 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
2735 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
2736 (namehek = GvNAME_HEK(gv)) &&
2737 (gvp = hv_fetch(stash, HEK_KEY(namehek),
2738 HEK_LEN(namehek)*(HEK_UTF8(namehek) ? -1 : 1), 0)) &&
2740 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
2744 SvFLAGS(gv) = SVt_IV|SVf_ROK;
2745 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
2746 STRUCT_OFFSET(XPVIV, xiv_iv));
2747 SvRV_set(gv, value);
2753 * c-indentation-style: bsd
2755 * indent-tabs-mode: t
2758 * ex: set ts=8 sts=4 sw=4 noet: