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)
963 assert(HvNAME_get(stash));
968 =for apidoc gv_stashsv
970 Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
976 Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
979 const char * const ptr = SvPV_const(sv,len);
981 PERL_ARGS_ASSERT_GV_STASHSV;
983 return gv_stashpvn(ptr, len, flags);
988 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
989 PERL_ARGS_ASSERT_GV_FETCHPV;
990 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
994 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
996 const char * const nambeg = SvPV_const(name, len);
997 PERL_ARGS_ASSERT_GV_FETCHSV;
998 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1002 S_gv_magicalize_isa(pTHX_ GV *gv)
1006 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1010 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1015 S_gv_magicalize_overload(pTHX_ GV *gv)
1019 PERL_ARGS_ASSERT_GV_MAGICALIZE_OVERLOAD;
1023 hv_magic(hv, NULL, PERL_MAGIC_overload);
1027 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
1028 const svtype sv_type)
1031 register const char *name = nambeg;
1032 register GV *gv = NULL;
1035 register const char *name_cursor;
1037 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
1038 const I32 no_expand = flags & GV_NOEXPAND;
1039 const I32 add = flags & ~GV_NOADD_MASK;
1040 const char *const name_end = nambeg + full_len;
1041 const char *const name_em1 = name_end - 1;
1044 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
1046 if (flags & GV_NOTQUAL) {
1047 /* Caller promised that there is no stash, so we can skip the check. */
1052 if (full_len > 2 && *name == '*' && isALPHA(name[1])) {
1053 /* accidental stringify on a GV? */
1057 for (name_cursor = name; name_cursor < name_end; name_cursor++) {
1058 if ((*name_cursor == ':' && name_cursor < name_em1
1059 && name_cursor[1] == ':')
1060 || (*name_cursor == '\'' && name_cursor[1]))
1063 stash = PL_defstash;
1064 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
1067 len = name_cursor - name;
1070 if (*name_cursor == ':') {
1075 Newx(tmpbuf, len+2, char);
1076 Copy(name, tmpbuf, len, char);
1077 tmpbuf[len++] = ':';
1078 tmpbuf[len++] = ':';
1081 gvp = (GV**)hv_fetch(stash, key, len, add);
1082 gv = gvp ? *gvp : NULL;
1083 if (gv && gv != (const GV *)&PL_sv_undef) {
1084 if (SvTYPE(gv) != SVt_PVGV)
1085 gv_init(gv, stash, key, len, (add & GV_ADDMULTI));
1091 if (!gv || gv == (const GV *)&PL_sv_undef)
1094 if (!(stash = GvHV(gv)))
1096 stash = GvHV(gv) = newHV();
1097 if (!HvNAME_get(stash)) {
1098 hv_name_set(stash, nambeg, name_cursor-nambeg, 0);
1099 /* If the containing stash has multiple effective
1100 names, see that this one gets them, too. */
1101 if (HvAUX(GvSTASH(gv))->xhv_name_count)
1102 mro_package_moved(stash, NULL, gv, 1);
1105 else if (!HvNAME_get(stash))
1106 hv_name_set(stash, nambeg, name_cursor - nambeg, 0);
1109 if (*name_cursor == ':')
1113 if (name == name_end)
1115 ? gv : MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1118 len = name_cursor - name;
1120 /* No stash in name, so see how we can default */
1124 if (len && isIDFIRST_lazy(name)) {
1125 bool global = FALSE;
1133 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1134 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1135 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
1139 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1144 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1145 && name[3] == 'I' && name[4] == 'N')
1149 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1150 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1151 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
1155 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1156 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1163 stash = PL_defstash;
1164 else if (IN_PERL_COMPILETIME) {
1165 stash = PL_curstash;
1166 if (add && (PL_hints & HINT_STRICT_VARS) &&
1167 sv_type != SVt_PVCV &&
1168 sv_type != SVt_PVGV &&
1169 sv_type != SVt_PVFM &&
1170 sv_type != SVt_PVIO &&
1171 !(len == 1 && sv_type == SVt_PV &&
1172 (*name == 'a' || *name == 'b')) )
1174 gvp = (GV**)hv_fetch(stash,name,len,0);
1176 *gvp == (const GV *)&PL_sv_undef ||
1177 SvTYPE(*gvp) != SVt_PVGV)
1181 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1182 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1183 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1185 /* diag_listed_as: Variable "%s" is not imported%s */
1187 aTHX_ packWARN(WARN_MISC),
1188 "Variable \"%c%s\" is not imported",
1189 sv_type == SVt_PVAV ? '@' :
1190 sv_type == SVt_PVHV ? '%' : '$',
1194 aTHX_ packWARN(WARN_MISC),
1195 "\t(Did you mean &%s instead?)\n", name
1202 stash = CopSTASH(PL_curcop);
1205 stash = PL_defstash;
1208 /* By this point we should have a stash and a name */
1212 SV * const err = Perl_mess(aTHX_
1213 "Global symbol \"%s%s\" requires explicit package name",
1214 (sv_type == SVt_PV ? "$"
1215 : sv_type == SVt_PVAV ? "@"
1216 : sv_type == SVt_PVHV ? "%"
1219 if (USE_UTF8_IN_NAMES)
1222 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1224 /* symbol table under destruction */
1233 if (!SvREFCNT(stash)) /* symbol table under destruction */
1236 gvp = (GV**)hv_fetch(stash,name,len,add);
1237 if (!gvp || *gvp == (const GV *)&PL_sv_undef)
1240 if (SvTYPE(gv) == SVt_PVGV) {
1243 gv_init_sv(gv, sv_type);
1244 if (len == 1 && stash == PL_defstash
1245 && (sv_type == SVt_PVHV || sv_type == SVt_PVGV)) {
1247 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1248 else if (*name == '-' || *name == '+')
1249 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
1251 else if (len == 3 && sv_type == SVt_PVAV
1252 && strnEQ(name, "ISA", 3)
1253 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
1254 gv_magicalize_isa(gv);
1257 } else if (no_init) {
1259 } else if (no_expand && SvROK(gv)) {
1263 /* Adding a new symbol.
1264 Unless of course there was already something non-GV here, in which case
1265 we want to behave as if there was always a GV here, containing some sort
1267 Otherwise we run the risk of creating things like GvIO, which can cause
1268 subtle bugs. eg the one that tripped up SQL::Translator */
1270 faking_it = SvOK(gv);
1272 if (add & GV_ADDWARN)
1273 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
1274 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
1275 gv_init_sv(gv, faking_it ? SVt_PVCV : sv_type);
1277 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
1278 : (PL_dowarn & G_WARN_ON ) ) )
1281 /* set up magic where warranted */
1282 if (stash != PL_defstash) { /* not the main stash */
1283 /* We only have to check for four names here: EXPORT, ISA, OVERLOAD
1284 and VERSION. All the others apply only to the main stash. */
1286 const char * const name2 = name + 1;
1289 if (strnEQ(name2, "XPORT", 5))
1293 if (strEQ(name2, "SA"))
1294 gv_magicalize_isa(gv);
1297 if (strEQ(name2, "VERLOAD"))
1298 gv_magicalize_overload(gv);
1301 if (strEQ(name2, "ERSION"))
1311 /* Nothing else to do.
1312 The compiler will probably turn the switch statement into a
1313 branch table. Make sure we avoid even that small overhead for
1314 the common case of lower case variable names. */
1318 const char * const name2 = name + 1;
1321 if (strEQ(name2, "RGV")) {
1322 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1324 else if (strEQ(name2, "RGVOUT")) {
1329 if (strnEQ(name2, "XPORT", 5))
1333 if (strEQ(name2, "SA")) {
1334 gv_magicalize_isa(gv);
1338 if (strEQ(name2, "VERLOAD")) {
1339 gv_magicalize_overload(gv);
1343 if (strEQ(name2, "IG")) {
1346 if (!PL_psig_name) {
1347 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
1348 Newxz(PL_psig_pend, SIG_SIZE, int);
1349 PL_psig_ptr = PL_psig_name + SIG_SIZE;
1351 /* I think that the only way to get here is to re-use an
1352 embedded perl interpreter, where the previous
1353 use didn't clean up fully because
1354 PL_perl_destruct_level was 0. I'm not sure that we
1355 "support" that, in that I suspect in that scenario
1356 there are sufficient other garbage values left in the
1357 interpreter structure that something else will crash
1358 before we get here. I suspect that this is one of
1359 those "doctor, it hurts when I do this" bugs. */
1360 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
1361 Zero(PL_psig_pend, SIG_SIZE, int);
1365 hv_magic(hv, NULL, PERL_MAGIC_sig);
1366 for (i = 1; i < SIG_SIZE; i++) {
1367 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1369 sv_setsv(*init, &PL_sv_undef);
1374 if (strEQ(name2, "ERSION"))
1377 case '\003': /* $^CHILD_ERROR_NATIVE */
1378 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1381 case '\005': /* $^ENCODING */
1382 if (strEQ(name2, "NCODING"))
1385 case '\007': /* $^GLOBAL_PHASE */
1386 if (strEQ(name2, "LOBAL_PHASE"))
1389 case '\015': /* $^MATCH */
1390 if (strEQ(name2, "ATCH"))
1392 case '\017': /* $^OPEN */
1393 if (strEQ(name2, "PEN"))
1396 case '\020': /* $^PREMATCH $^POSTMATCH */
1397 if (strEQ(name2, "REMATCH") || strEQ(name2, "OSTMATCH"))
1400 case '\024': /* ${^TAINT} */
1401 if (strEQ(name2, "AINT"))
1404 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1405 if (strEQ(name2, "NICODE"))
1407 if (strEQ(name2, "TF8LOCALE"))
1409 if (strEQ(name2, "TF8CACHE"))
1412 case '\027': /* $^WARNING_BITS */
1413 if (strEQ(name2, "ARNING_BITS"))
1426 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1428 /* This snippet is taken from is_gv_magical */
1429 const char *end = name + len;
1430 while (--end > name) {
1431 if (!isDIGIT(*end)) return gv;
1438 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1439 be case '\0' in this switch statement (ie a default case) */
1445 sv_type == SVt_PVAV ||
1446 sv_type == SVt_PVHV ||
1447 sv_type == SVt_PVCV ||
1448 sv_type == SVt_PVFM ||
1451 PL_sawampersand = TRUE;
1455 sv_setpv(GvSVn(gv),PL_chopset);
1459 #ifdef COMPLEX_STATUS
1460 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1466 /* If %! has been used, automatically load Errno.pm. */
1468 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1470 /* magicalization must be done before require_tie_mod is called */
1471 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1472 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1477 GvMULTI_on(gv); /* no used once warnings here */
1479 AV* const av = GvAVn(gv);
1480 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
1482 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
1483 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1485 SvREADONLY_on(GvSVn(gv));
1488 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1489 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
1495 if (sv_type == SVt_PV)
1496 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1497 "$%c is no longer supported", *name);
1500 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1503 case '\010': /* $^H */
1505 HV *const hv = GvHVn(gv);
1506 hv_magic(hv, NULL, PERL_MAGIC_hints);
1509 case '\023': /* $^S */
1511 SvREADONLY_on(GvSVn(gv));
1535 case '\001': /* $^A */
1536 case '\003': /* $^C */
1537 case '\004': /* $^D */
1538 case '\005': /* $^E */
1539 case '\006': /* $^F */
1540 case '\011': /* $^I, NOT \t in EBCDIC */
1541 case '\016': /* $^N */
1542 case '\017': /* $^O */
1543 case '\020': /* $^P */
1544 case '\024': /* $^T */
1545 case '\027': /* $^W */
1547 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1550 case '\014': /* $^L */
1551 sv_setpvs(GvSVn(gv),"\f");
1552 PL_formfeed = GvSVn(gv);
1555 sv_setpvs(GvSVn(gv),"\034");
1559 SV * const sv = GvSVn(gv);
1560 if (!sv_derived_from(PL_patchlevel, "version"))
1561 upg_version(PL_patchlevel, TRUE);
1562 GvSV(gv) = vnumify(PL_patchlevel);
1563 SvREADONLY_on(GvSV(gv));
1567 case '\026': /* $^V */
1569 SV * const sv = GvSVn(gv);
1570 GvSV(gv) = new_version(PL_patchlevel);
1571 SvREADONLY_on(GvSV(gv));
1581 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1585 const HV * const hv = GvSTASH(gv);
1587 PERL_ARGS_ASSERT_GV_FULLNAME4;
1593 sv_setpv(sv, prefix ? prefix : "");
1595 name = HvNAME_get(hv);
1597 namelen = HvNAMELEN_get(hv);
1603 if (keepmain || strNE(name, "main")) {
1604 sv_catpvn(sv,name,namelen);
1607 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1611 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1613 const GV * const egv = GvEGVx(gv);
1615 PERL_ARGS_ASSERT_GV_EFULLNAME4;
1617 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1621 Perl_gv_check(pTHX_ const HV *stash)
1626 PERL_ARGS_ASSERT_GV_CHECK;
1628 if (!HvARRAY(stash))
1630 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1632 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1635 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1636 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
1638 if (hv != PL_defstash && hv != stash)
1639 gv_check(hv); /* nested package */
1641 else if (isALPHA(*HeKEY(entry))) {
1643 gv = MUTABLE_GV(HeVAL(entry));
1644 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1647 CopLINE_set(PL_curcop, GvLINE(gv));
1649 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1651 CopFILEGV(PL_curcop)
1652 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
1654 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1655 "Name \"%s::%s\" used only once: possible typo",
1656 HvNAME_get(stash), GvNAME(gv));
1663 Perl_newGVgen(pTHX_ const char *pack)
1667 PERL_ARGS_ASSERT_NEWGVGEN;
1669 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1673 /* hopefully this is only called on local symbol table entries */
1676 Perl_gp_ref(pTHX_ GP *gp)
1684 /* If the GP they asked for a reference to contains
1685 a method cache entry, clear it first, so that we
1686 don't infect them with our cached entry */
1687 SvREFCNT_dec(gp->gp_cv);
1696 Perl_gp_free(pTHX_ GV *gv)
1702 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
1704 if (gp->gp_refcnt == 0) {
1705 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
1706 "Attempt to free unreferenced glob pointers"
1707 pTHX__FORMAT pTHX__VALUE);
1710 if (--gp->gp_refcnt > 0) {
1711 if (gp->gp_egv == gv)
1718 /* Copy and null out all the glob slots, so destructors do not see
1720 HEK * const file_hek = gp->gp_file_hek;
1721 SV * const sv = gp->gp_sv;
1722 AV * const av = gp->gp_av;
1723 HV * const hv = gp->gp_hv;
1724 IO * const io = gp->gp_io;
1725 CV * const cv = gp->gp_cv;
1726 CV * const form = gp->gp_form;
1728 gp->gp_file_hek = NULL;
1737 unshare_hek(file_hek);
1741 /* FIXME - another reference loop GV -> symtab -> GV ?
1742 Somehow gp->gp_hv can end up pointing at freed garbage. */
1743 if (hv && SvTYPE(hv) == SVt_PVHV) {
1744 const char *hvname = HvNAME_get(hv);
1745 if (PL_stashcache && hvname)
1746 (void)hv_delete(PL_stashcache, hvname, HvNAMELEN_get(hv),
1754 if (!gp->gp_file_hek
1760 && !gp->gp_form) break;
1762 if (--attempts == 0) {
1764 "panic: gp_free failed to free glob pointer - "
1765 "something is repeatedly re-creating entries"
1775 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1777 AMT * const amtp = (AMT*)mg->mg_ptr;
1778 PERL_UNUSED_ARG(sv);
1780 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
1782 if (amtp && AMT_AMAGIC(amtp)) {
1784 for (i = 1; i < NofAMmeth; i++) {
1785 CV * const cv = amtp->table[i];
1787 SvREFCNT_dec(MUTABLE_SV(cv));
1788 amtp->table[i] = NULL;
1795 /* Updates and caches the CV's */
1797 * 1 on success and there is some overload
1798 * 0 if there is no overload
1799 * -1 if some error occurred and it couldn't croak
1803 Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
1806 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
1808 const struct mro_meta* stash_meta = HvMROMETA(stash);
1811 PERL_ARGS_ASSERT_GV_AMUPDATE;
1813 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
1815 const AMT * const amtp = (AMT*)mg->mg_ptr;
1816 if (amtp->was_ok_am == PL_amagic_generation
1817 && amtp->was_ok_sub == newgen) {
1818 return AMT_OVERLOADED(amtp) ? 1 : 0;
1820 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
1823 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1826 amt.was_ok_am = PL_amagic_generation;
1827 amt.was_ok_sub = newgen;
1828 amt.fallback = AMGfallNO;
1832 int filled = 0, have_ovl = 0;
1835 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1837 /* Try to find via inheritance. */
1838 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1839 SV * const sv = gv ? GvSV(gv) : NULL;
1843 lim = DESTROY_amg; /* Skip overloading entries. */
1844 #ifdef PERL_DONT_CREATE_GVSV
1846 NOOP; /* Equivalent to !SvTRUE and !SvOK */
1849 else if (SvTRUE(sv))
1850 amt.fallback=AMGfallYES;
1852 amt.fallback=AMGfallNEVER;
1854 for (i = 1; i < lim; i++)
1855 amt.table[i] = NULL;
1856 for (; i < NofAMmeth; i++) {
1857 const char * const cooky = PL_AMG_names[i];
1858 /* Human-readable form, for debugging: */
1859 const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1860 const STRLEN l = PL_AMG_namelens[i];
1862 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1863 cp, HvNAME_get(stash)) );
1864 /* don't fill the cache while looking up!
1865 Creation of inheritance stubs in intermediate packages may
1866 conflict with the logic of runtime method substitution.
1867 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1868 then we could have created stubs for "(+0" in A and C too.
1869 But if B overloads "bool", we may want to use it for
1870 numifying instead of C's "+0". */
1871 if (i >= DESTROY_amg)
1872 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1873 else /* Autoload taken care of below */
1874 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1876 if (gv && (cv = GvCV(gv))) {
1878 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1879 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1880 /* This is a hack to support autoloading..., while
1881 knowing *which* methods were declared as overloaded. */
1882 /* GvSV contains the name of the method. */
1884 SV *gvsv = GvSV(gv);
1886 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1887 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1888 (void*)GvSV(gv), cp, hvname) );
1889 if (!gvsv || !SvPOK(gvsv)
1890 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1893 /* Can be an import stub (created by "can"). */
1898 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1899 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1900 "in package \"%.256s\"",
1901 (GvCVGEN(gv) ? "Stub found while resolving"
1906 cv = GvCV(gv = ngv);
1908 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1909 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1910 GvNAME(CvGV(cv))) );
1912 if (i < DESTROY_amg)
1914 } else if (gv) { /* Autoloaded... */
1915 cv = MUTABLE_CV(gv);
1918 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
1921 AMT_AMAGIC_on(&amt);
1923 AMT_OVERLOADED_on(&amt);
1924 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
1925 (char*)&amt, sizeof(AMT));
1929 /* Here we have no table: */
1931 AMT_AMAGIC_off(&amt);
1932 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
1933 (char*)&amt, sizeof(AMTS));
1939 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1945 struct mro_meta* stash_meta;
1947 if (!stash || !HvNAME_get(stash))
1950 stash_meta = HvMROMETA(stash);
1951 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
1953 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
1956 /* If we're looking up a destructor to invoke, we must avoid
1957 * that Gv_AMupdate croaks, because we might be dying already */
1958 if (Gv_AMupdate(stash, cBOOL(id == DESTROY_amg)) == -1) {
1959 /* and if it didn't found a destructor, we fall back
1960 * to a simpler method that will only look for the
1961 * destructor instead of the whole magic */
1962 if (id == DESTROY_amg) {
1963 GV * const gv = gv_fetchmethod(stash, "DESTROY");
1969 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
1972 amtp = (AMT*)mg->mg_ptr;
1973 if ( amtp->was_ok_am != PL_amagic_generation
1974 || amtp->was_ok_sub != newgen )
1976 if (AMT_AMAGIC(amtp)) {
1977 CV * const ret = amtp->table[id];
1978 if (ret && isGV(ret)) { /* Autoloading stab */
1979 /* Passing it through may have resulted in a warning
1980 "Inherited AUTOLOAD for a non-method deprecated", since
1981 our caller is going through a function call, not a method call.
1982 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1983 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1995 /* Implement tryAMAGICun_MG macro.
1996 Do get magic, then see if the stack arg is overloaded and if so call it.
1998 AMGf_set return the arg using SETs rather than assigning to
2000 AMGf_numeric apply sv_2num to the stack arg.
2004 Perl_try_amagic_un(pTHX_ int method, int flags) {
2008 SV* const arg = TOPs;
2012 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2013 AMGf_noright | AMGf_unary))) {
2014 if (flags & AMGf_set) {
2019 if (SvPADMY(TARG)) {
2020 sv_setsv(TARG, tmpsv);
2030 if ((flags & AMGf_numeric) && SvROK(arg))
2036 /* Implement tryAMAGICbin_MG macro.
2037 Do get magic, then see if the two stack args are overloaded and if so
2040 AMGf_set return the arg using SETs rather than assigning to
2042 AMGf_assign op may be called as mutator (eg +=)
2043 AMGf_numeric apply sv_2num to the stack arg.
2047 Perl_try_amagic_bin(pTHX_ int method, int flags) {
2050 SV* const left = TOPm1s;
2051 SV* const right = TOPs;
2057 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2058 SV * const tmpsv = amagic_call(left, right, method,
2059 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2061 if (flags & AMGf_set) {
2068 if (opASSIGN || SvPADMY(TARG)) {
2069 sv_setsv(TARG, tmpsv);
2079 if (flags & AMGf_numeric) {
2081 *(sp-1) = sv_2num(left);
2083 *sp = sv_2num(right);
2089 Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2092 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2094 while (SvAMAGIC(ref) &&
2095 (tmpsv = amagic_call(ref, &PL_sv_undef, method,
2096 AMGf_noright | AMGf_unary))) {
2098 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2099 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2100 /* Bail out if it returns us the same reference. */
2105 return tmpsv ? tmpsv : ref;
2109 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
2114 CV **cvp=NULL, **ocvp=NULL;
2115 AMT *amtp=NULL, *oamtp=NULL;
2116 int off = 0, off1, lr = 0, notfound = 0;
2117 int postpr = 0, force_cpy = 0;
2118 int assign = AMGf_assign & flags;
2119 const int assignshift = assign ? 1 : 0;
2120 int use_default_op = 0;
2126 PERL_ARGS_ASSERT_AMAGIC_CALL;
2128 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
2129 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2131 if ( !lex_mask || !SvOK(lex_mask) )
2132 /* overloading lexically disabled */
2134 else if ( lex_mask && SvPOK(lex_mask) ) {
2135 /* we have an entry in the hints hash, check if method has been
2136 * masked by overloading.pm */
2138 const int offset = method / 8;
2139 const int bit = method % 8;
2140 char *pv = SvPV(lex_mask, len);
2142 /* Bit set, so this overloading operator is disabled */
2143 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2148 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
2149 && (stash = SvSTASH(SvRV(left)))
2150 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
2151 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
2152 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
2154 && ((cv = cvp[off=method+assignshift])
2155 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2161 cv = cvp[off=method])))) {
2162 lr = -1; /* Call method for left argument */
2164 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2167 /* look for substituted methods */
2168 /* In all the covered cases we should be called with assign==0. */
2172 if ((cv = cvp[off=add_ass_amg])
2173 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
2174 right = &PL_sv_yes; lr = -1; assign = 1;
2179 if ((cv = cvp[off = subtr_ass_amg])
2180 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
2181 right = &PL_sv_yes; lr = -1; assign = 1;
2185 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
2188 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
2191 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
2194 (void)((cv = cvp[off=bool__amg])
2195 || (cv = cvp[off=numer_amg])
2196 || (cv = cvp[off=string_amg]));
2203 * SV* ref causes confusion with the interpreter variable of
2206 SV* const tmpRef=SvRV(left);
2207 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
2209 * Just to be extra cautious. Maybe in some
2210 * additional cases sv_setsv is safe, too.
2212 SV* const newref = newSVsv(tmpRef);
2213 SvOBJECT_on(newref);
2214 /* As a bit of a source compatibility hack, SvAMAGIC() and
2215 friends dereference an RV, to behave the same was as when
2216 overloading was stored on the reference, not the referant.
2217 Hence we can't use SvAMAGIC_on()
2219 SvFLAGS(newref) |= SVf_AMAGIC;
2220 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
2226 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
2227 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
2228 SV* const nullsv=sv_2mortal(newSViv(0));
2230 SV* const lessp = amagic_call(left,nullsv,
2231 lt_amg,AMGf_noright);
2232 logic = SvTRUE(lessp);
2234 SV* const lessp = amagic_call(left,nullsv,
2235 ncmp_amg,AMGf_noright);
2236 logic = (SvNV(lessp) < 0);
2239 if (off==subtr_amg) {
2250 if ((cv = cvp[off=subtr_amg])) {
2252 left = sv_2mortal(newSViv(0));
2257 case iter_amg: /* XXXX Eventually should do to_gv. */
2258 case ftest_amg: /* XXXX Eventually should do to_gv. */
2261 return NULL; /* Delegate operation to standard mechanisms. */
2269 return left; /* Delegate operation to standard mechanisms. */
2274 if (!cv) goto not_found;
2275 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
2276 && (stash = SvSTASH(SvRV(right)))
2277 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
2278 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
2279 ? (amtp = (AMT*)mg->mg_ptr)->table
2281 && (cv = cvp[off=method])) { /* Method for right
2284 } else if (((cvp && amtp->fallback > AMGfallNEVER)
2285 || (ocvp && oamtp->fallback > AMGfallNEVER))
2286 && !(flags & AMGf_unary)) {
2287 /* We look for substitution for
2288 * comparison operations and
2290 if (method==concat_amg || method==concat_ass_amg
2291 || method==repeat_amg || method==repeat_ass_amg) {
2292 return NULL; /* Delegate operation to string conversion */
2314 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
2318 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
2328 not_found: /* No method found, either report or croak */
2336 return left; /* Delegate operation to standard mechanisms. */
2339 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
2340 notfound = 1; lr = -1;
2341 } else if (cvp && (cv=cvp[nomethod_amg])) {
2342 notfound = 1; lr = 1;
2343 } else if ((use_default_op =
2344 (!ocvp || oamtp->fallback >= AMGfallYES)
2345 && (!cvp || amtp->fallback >= AMGfallYES))
2347 /* Skip generating the "no method found" message. */
2351 if (off==-1) off=method;
2352 msg = sv_2mortal(Perl_newSVpvf(aTHX_
2353 "Operation \"%s\": no method found,%sargument %s%s%s%s",
2354 AMG_id2name(method + assignshift),
2355 (flags & AMGf_unary ? " " : "\n\tleft "),
2357 "in overloaded package ":
2358 "has no overloaded magic",
2360 HvNAME_get(SvSTASH(SvRV(left))):
2363 ",\n\tright argument in overloaded package ":
2366 : ",\n\tright argument has no overloaded magic"),
2368 HvNAME_get(SvSTASH(SvRV(right))):
2370 if (use_default_op) {
2371 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
2373 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
2377 force_cpy = force_cpy || assign;
2382 DEBUG_o(Perl_deb(aTHX_
2383 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
2385 method+assignshift==off? "" :
2387 method+assignshift==off? "" :
2388 AMG_id2name(method+assignshift),
2389 method+assignshift==off? "" : "\")",
2390 flags & AMGf_unary? "" :
2391 lr==1 ? " for right argument": " for left argument",
2392 flags & AMGf_unary? " for argument" : "",
2393 stash ? HvNAME_get(stash) : "null",
2394 fl? ",\n\tassignment variant used": "") );
2397 /* Since we use shallow copy during assignment, we need
2398 * to dublicate the contents, probably calling user-supplied
2399 * version of copy operator
2401 /* We need to copy in following cases:
2402 * a) Assignment form was called.
2403 * assignshift==1, assign==T, method + 1 == off
2404 * b) Increment or decrement, called directly.
2405 * assignshift==0, assign==0, method + 0 == off
2406 * c) Increment or decrement, translated to assignment add/subtr.
2407 * assignshift==0, assign==T,
2409 * d) Increment or decrement, translated to nomethod.
2410 * assignshift==0, assign==0,
2412 * e) Assignment form translated to nomethod.
2413 * assignshift==1, assign==T, method + 1 != off
2416 /* off is method, method+assignshift, or a result of opcode substitution.
2417 * In the latter case assignshift==0, so only notfound case is important.
2419 if (( (method + assignshift == off)
2420 && (assign || (method == inc_amg) || (method == dec_amg)))
2423 /* newSVsv does not behave as advertised, so we copy missing
2424 * information by hand */
2425 SV *tmpRef = SvRV(left);
2427 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
2428 SvRV_set(left, rv_copy);
2430 SvREFCNT_dec(tmpRef);
2438 const bool oldcatch = CATCH_GET;
2441 Zero(&myop, 1, BINOP);
2442 myop.op_last = (OP *) &myop;
2443 myop.op_next = NULL;
2444 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
2446 PUSHSTACKi(PERLSI_OVERLOAD);
2449 PL_op = (OP *) &myop;
2450 if (PERLDB_SUB && PL_curstash != PL_debstash)
2451 PL_op->op_private |= OPpENTERSUB_DB;
2453 Perl_pp_pushmark(aTHX);
2455 EXTEND(SP, notfound + 5);
2456 PUSHs(lr>0? right: left);
2457 PUSHs(lr>0? left: right);
2458 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
2460 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
2461 AMG_id2namelen(method + assignshift), SVs_TEMP));
2463 PUSHs(MUTABLE_SV(cv));
2466 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
2474 CATCH_SET(oldcatch);
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 ans=SvIV(res)!=0; break;
2499 SvSetSV(left,res); return left;
2501 ans=!SvTRUE(res); break;
2506 } else if (method==copy_amg) {
2508 Perl_croak(aTHX_ "Copy method did not return a reference");
2510 return SvREFCNT_inc(SvRV(res));
2518 =for apidoc is_gv_magical_sv
2520 Returns C<TRUE> if given the name of a magical GV.
2522 Currently only useful internally when determining if a GV should be
2523 created even in rvalue contexts.
2525 C<flags> is not used at present but available for future extension to
2526 allow selecting particular classes of magical variable.
2528 Currently assumes that C<name> is NUL terminated (as well as len being valid).
2529 This assumption is met by all callers within the perl core, which all pass
2530 pointers returned by SvPV.
2536 Perl_is_gv_magical_sv(pTHX_ SV *const name_sv, U32 flags)
2539 const char *const name = SvPV_const(name_sv, len);
2541 PERL_UNUSED_ARG(flags);
2542 PERL_ARGS_ASSERT_IS_GV_MAGICAL_SV;
2545 const char * const name1 = name + 1;
2548 if (len == 3 && name[1] == 'S' && name[2] == 'A')
2552 if (len == 8 && strEQ(name1, "VERLOAD"))
2556 if (len == 3 && name[1] == 'I' && name[2] == 'G')
2559 /* Using ${^...} variables is likely to be sufficiently rare that
2560 it seems sensible to avoid the space hit of also checking the
2562 case '\017': /* ${^OPEN} */
2563 if (strEQ(name1, "PEN"))
2566 case '\024': /* ${^TAINT} */
2567 if (strEQ(name1, "AINT"))
2570 case '\025': /* ${^UNICODE} */
2571 if (strEQ(name1, "NICODE"))
2573 if (strEQ(name1, "TF8LOCALE"))
2576 case '\027': /* ${^WARNING_BITS} */
2577 if (strEQ(name1, "ARNING_BITS"))
2590 const char *end = name + len;
2591 while (--end > name) {
2599 /* Because we're already assuming that name is NUL terminated
2600 below, we can treat an empty name as "\0" */
2626 case '\001': /* $^A */
2627 case '\003': /* $^C */
2628 case '\004': /* $^D */
2629 case '\005': /* $^E */
2630 case '\006': /* $^F */
2631 case '\010': /* $^H */
2632 case '\011': /* $^I, NOT \t in EBCDIC */
2633 case '\014': /* $^L */
2634 case '\016': /* $^N */
2635 case '\017': /* $^O */
2636 case '\020': /* $^P */
2637 case '\023': /* $^S */
2638 case '\024': /* $^T */
2639 case '\026': /* $^V */
2640 case '\027': /* $^W */
2660 Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
2665 PERL_ARGS_ASSERT_GV_NAME_SET;
2666 PERL_UNUSED_ARG(flags);
2669 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
2671 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
2672 unshare_hek(GvNAME_HEK(gv));
2675 PERL_HASH(hash, name, len);
2676 GvNAME_HEK(gv) = share_hek(name, len, hash);
2680 =for apidoc gv_try_downgrade
2682 If the typeglob C<gv> can be expressed more succinctly, by having
2683 something other than a real GV in its place in the stash, replace it
2684 with the optimised form. Basic requirements for this are that C<gv>
2685 is a real typeglob, is sufficiently ordinary, and is only referenced
2686 from its package. This function is meant to be used when a GV has been
2687 looked up in part to see what was there, causing upgrading, but based
2688 on what was found it turns out that the real GV isn't required after all.
2690 If C<gv> is a completely empty typeglob, it is deleted from the stash.
2692 If C<gv> is a typeglob containing only a sufficiently-ordinary constant
2693 sub, the typeglob is replaced with a scalar-reference placeholder that
2694 more compactly represents the same thing.
2700 Perl_gv_try_downgrade(pTHX_ GV *gv)
2706 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
2708 /* XXX Why and where does this leave dangling pointers during global
2710 if (PL_phase == PERL_PHASE_DESTRUCT) return;
2712 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
2713 !SvOBJECT(gv) && !SvREADONLY(gv) &&
2714 isGV_with_GP(gv) && GvGP(gv) &&
2715 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
2716 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
2717 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2719 if (SvMAGICAL(gv)) {
2721 /* only backref magic is allowed */
2722 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
2724 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
2725 if (mg->mg_type != PERL_MAGIC_backref)
2731 HEK *gvnhek = GvNAME_HEK(gv);
2732 (void)hv_delete(stash, HEK_KEY(gvnhek),
2733 HEK_UTF8(gvnhek) ? -HEK_LEN(gvnhek) : HEK_LEN(gvnhek), G_DISCARD);
2734 } else if (GvMULTI(gv) && cv &&
2735 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
2736 CvSTASH(cv) == stash && CvGV(cv) == gv &&
2737 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
2738 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
2739 (namehek = GvNAME_HEK(gv)) &&
2740 (gvp = hv_fetch(stash, HEK_KEY(namehek),
2741 HEK_LEN(namehek)*(HEK_UTF8(namehek) ? -1 : 1), 0)) &&
2743 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
2747 SvFLAGS(gv) = SVt_IV|SVf_ROK;
2748 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
2749 STRUCT_OFFSET(XPVIV, xiv_iv));
2750 SvRV_set(gv, value);
2756 * c-indentation-style: bsd
2758 * indent-tabs-mode: t
2761 * ex: set ts=8 sts=4 sw=4 noet: