3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
12 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
13 * of your inquisitiveness, I shall spend all the rest of my days in answering
14 * you. What more do you want to know?'
15 * 'The names of all the stars, and of all living things, and the whole
16 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
19 * [p.599 of _The Lord of the Rings_, III/xi: "The PalantÃr"]
25 A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
26 It is a structure that holds a pointer to a scalar, an array, a hash etc,
27 corresponding to $foo, @foo, %foo.
29 GVs are usually found as values in stashes (symbol table hashes) where
30 Perl stores its global variables.
40 static const char S_autoload[] = "AUTOLOAD";
41 static const STRLEN S_autolen = sizeof(S_autoload)-1;
44 Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
51 SvTYPE((const SV *)gv) != SVt_PVGV
52 && SvTYPE((const SV *)gv) != SVt_PVLV
56 if (type == SVt_PVIO) {
58 * if it walks like a dirhandle, then let's assume that
59 * this is a dirhandle.
61 what = PL_op->op_type == OP_READDIR ||
62 PL_op->op_type == OP_TELLDIR ||
63 PL_op->op_type == OP_SEEKDIR ||
64 PL_op->op_type == OP_REWINDDIR ||
65 PL_op->op_type == OP_CLOSEDIR ?
66 "dirhandle" : "filehandle";
67 /* diag_listed_as: Bad symbol for filehandle */
68 } else if (type == SVt_PVHV) {
71 what = type == SVt_PVAV ? "array" : "scalar";
73 Perl_croak(aTHX_ "Bad symbol for %s", what);
76 if (type == SVt_PVHV) {
77 where = (SV **)&GvHV(gv);
78 } else if (type == SVt_PVAV) {
79 where = (SV **)&GvAV(gv);
80 } else if (type == SVt_PVIO) {
81 where = (SV **)&GvIOp(gv);
87 *where = newSV_type(type);
92 Perl_gv_fetchfile(pTHX_ const char *name)
94 PERL_ARGS_ASSERT_GV_FETCHFILE;
95 return gv_fetchfile_flags(name, strlen(name), 0);
99 Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
105 const STRLEN tmplen = namelen + 2;
108 PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS;
109 PERL_UNUSED_ARG(flags);
114 if (tmplen <= sizeof smallbuf)
117 Newx(tmpbuf, tmplen, char);
118 /* This is where the debugger's %{"::_<$filename"} hash is created */
121 memcpy(tmpbuf + 2, name, namelen);
122 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
124 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
125 #ifdef PERL_DONT_CREATE_GVSV
126 GvSV(gv) = newSVpvn(name, namelen);
128 sv_setpvn(GvSV(gv), name, namelen);
131 if ((PERLDB_LINE || PERLDB_SAVESRC) && !GvAV(gv))
132 hv_magic(GvHVn(gv_AVadd(gv)), NULL, PERL_MAGIC_dbfile);
133 if (tmpbuf != smallbuf)
139 =for apidoc gv_const_sv
141 If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
142 inlining, or C<gv> is a placeholder reference that would be promoted to such
143 a typeglob, then returns the value returned by the sub. Otherwise, returns
150 Perl_gv_const_sv(pTHX_ GV *gv)
152 PERL_ARGS_ASSERT_GV_CONST_SV;
154 if (SvTYPE(gv) == SVt_PVGV)
155 return cv_const_sv(GvCVu(gv));
156 return SvROK(gv) ? SvRV(gv) : NULL;
160 Perl_newGP(pTHX_ GV *const gv)
165 const char *const file
166 = (PL_curcop && CopFILE(PL_curcop)) ? CopFILE(PL_curcop) : "";
167 const STRLEN len = strlen(file);
169 SV *const temp_sv = CopFILESV(PL_curcop);
173 PERL_ARGS_ASSERT_NEWGP;
176 file = SvPVX(temp_sv);
177 len = SvCUR(temp_sv);
184 PERL_HASH(hash, file, len);
188 #ifndef PERL_DONT_CREATE_GVSV
189 gp->gp_sv = newSV(0);
192 gp->gp_line = PL_curcop ? CopLINE(PL_curcop) : 0;
193 /* XXX Ideally this cast would be replaced with a change to const char*
195 gp->gp_file_hek = share_hek(file, len, hash);
202 /* Assign CvGV(cv) = gv, handling weak references.
203 * See also S_anonymise_cv_maybe */
206 Perl_cvgv_set(pTHX_ CV* cv, GV* gv)
208 GV * const oldgv = CvGV(cv);
209 PERL_ARGS_ASSERT_CVGV_SET;
220 sv_del_backref(MUTABLE_SV(oldgv), MUTABLE_SV(cv));
224 SvANY(cv)->xcv_gv = gv;
225 assert(!CvCVGV_RC(cv));
230 if (isGV_with_GP(gv) && GvGP(gv) && (GvCV(gv) == cv || GvFORM(gv) == cv))
231 Perl_sv_add_backref(aTHX_ MUTABLE_SV(gv), MUTABLE_SV(cv));
234 SvREFCNT_inc_simple_void_NN(gv);
238 /* Assign CvSTASH(cv) = st, handling weak references. */
241 Perl_cvstash_set(pTHX_ CV *cv, HV *st)
243 HV *oldst = CvSTASH(cv);
244 PERL_ARGS_ASSERT_CVSTASH_SET;
248 sv_del_backref(MUTABLE_SV(oldst), MUTABLE_SV(cv));
249 SvANY(cv)->xcv_stash = st;
251 Perl_sv_add_backref(aTHX_ MUTABLE_SV(st), MUTABLE_SV(cv));
255 Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
258 const U32 old_type = SvTYPE(gv);
259 const bool doproto = old_type > SVt_NULL;
260 char * const proto = (doproto && SvPOK(gv)) ? SvPVX(gv) : NULL;
261 const STRLEN protolen = proto ? SvCUR(gv) : 0;
262 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
263 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
265 PERL_ARGS_ASSERT_GV_INIT;
266 assert (!(proto && has_constant));
269 /* The constant has to be a simple scalar type. */
270 switch (SvTYPE(has_constant)) {
276 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
277 sv_reftype(has_constant, 0));
285 if (old_type < SVt_PVGV) {
286 if (old_type >= SVt_PV)
288 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
296 Safefree(SvPVX_mutable(gv));
301 GvGP_set(gv, Perl_newGP(aTHX_ gv));
304 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
305 gv_name_set(gv, name, len, GV_ADD);
306 if (multi || doproto) /* doproto means it _was_ mentioned */
308 if (doproto) { /* Replicate part of newSUB here. */
314 /* newCONSTSUB doesn't take a len arg, so make sure we
315 * give it a \0-terminated string */
316 name0 = savepvn(name,len);
318 /* newCONSTSUB takes ownership of the reference from us. */
319 cv = newCONSTSUB(stash, (name0 ? name0 : name), has_constant);
320 /* In case op.c:S_process_special_blocks stole it: */
322 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
323 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
326 /* If this reference was a copy of another, then the subroutine
327 must have been "imported", by a Perl space assignment to a GV
328 from a reference to CV. */
329 if (exported_constant)
330 GvIMPORTED_CV_on(gv);
332 (void) start_subparse(0,0); /* Create empty CV in compcv. */
338 mro_method_changed_in(GvSTASH(gv)); /* sub Foo::bar($) { (shift) } sub ASDF::baz($); *ASDF::baz = \&Foo::bar */
340 CvFILE_set_from_cop(cv, PL_curcop);
341 CvSTASH_set(cv, PL_curstash);
343 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
344 SV_HAS_TRAILING_NUL);
350 S_gv_init_sv(pTHX_ GV *gv, const svtype sv_type)
352 PERL_ARGS_ASSERT_GV_INIT_SV;
364 #ifdef PERL_DONT_CREATE_GVSV
372 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
373 If we just cast GvSVn(gv) to void, it ignores evaluating it for
381 =for apidoc gv_fetchmeth
383 Returns the glob with the given C<name> and a defined subroutine or
384 C<NULL>. The glob lives in the given C<stash>, or in the stashes
385 accessible via @ISA and UNIVERSAL::.
387 The argument C<level> should be either 0 or -1. If C<level==0>, as a
388 side-effect creates a glob with the given C<name> in the given C<stash>
389 which in the case of success contains an alias for the subroutine, and sets
390 up caching info for this glob.
392 This function grants C<"SUPER"> token as a postfix of the stash name. The
393 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
394 visible to Perl code. So when calling C<call_sv>, you should not use
395 the GV directly; instead, you should use the method's CV, which can be
396 obtained from the GV with the C<GvCV> macro.
401 /* NOTE: No support for tied ISA */
404 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
412 GV* candidate = NULL;
416 I32 create = (level >= 0) ? 1 : 0;
421 PERL_ARGS_ASSERT_GV_FETCHMETH;
423 /* UNIVERSAL methods should be callable without a stash */
425 create = 0; /* probably appropriate */
426 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
432 hvname = HvNAME_get(stash);
434 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
439 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
441 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
443 /* check locally for a real method or a cache entry */
444 gvp = (GV**)hv_fetch(stash, name, len, create);
448 if (SvTYPE(topgv) != SVt_PVGV)
449 gv_init(topgv, stash, name, len, TRUE);
450 if ((cand_cv = GvCV(topgv))) {
451 /* If genuine method or valid cache entry, use it */
452 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
456 /* stale cache entry, junk it and move on */
457 SvREFCNT_dec(cand_cv);
458 GvCV_set(topgv, NULL);
463 else if (GvCVGEN(topgv) == topgen_cmp) {
464 /* cache indicates no such method definitively */
469 packlen = HvNAMELEN_get(stash);
470 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
473 basestash = gv_stashpvn(hvname, packlen, GV_ADD);
474 linear_av = mro_get_linear_isa(basestash);
477 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
480 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
481 items = AvFILLp(linear_av); /* no +1, to skip over self */
483 linear_sv = *linear_svp++;
485 cstash = gv_stashsv(linear_sv, 0);
488 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX), "Can't locate package %"SVf" for @%s::ISA",
489 SVfARG(linear_sv), hvname);
495 gvp = (GV**)hv_fetch(cstash, name, len, 0);
499 if (SvTYPE(candidate) != SVt_PVGV) gv_init(candidate, cstash, name, len, TRUE);
500 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
502 * Found real method, cache method in topgv if:
503 * 1. topgv has no synonyms (else inheritance crosses wires)
504 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
506 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
507 CV *old_cv = GvCV(topgv);
508 SvREFCNT_dec(old_cv);
509 SvREFCNT_inc_simple_void_NN(cand_cv);
510 GvCV_set(topgv, cand_cv);
511 GvCVGEN(topgv) = topgen_cmp;
517 /* Check UNIVERSAL without caching */
518 if(level == 0 || level == -1) {
519 candidate = gv_fetchmeth(NULL, name, len, 1);
521 cand_cv = GvCV(candidate);
522 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
523 CV *old_cv = GvCV(topgv);
524 SvREFCNT_dec(old_cv);
525 SvREFCNT_inc_simple_void_NN(cand_cv);
526 GvCV_set(topgv, cand_cv);
527 GvCVGEN(topgv) = topgen_cmp;
533 if (topgv && GvREFCNT(topgv) == 1) {
534 /* cache the fact that the method is not defined */
535 GvCVGEN(topgv) = topgen_cmp;
542 =for apidoc gv_fetchmeth_autoload
544 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
545 Returns a glob for the subroutine.
547 For an autoloaded subroutine without a GV, will create a GV even
548 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
549 of the result may be zero.
555 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
557 GV *gv = gv_fetchmeth(stash, name, len, level);
559 PERL_ARGS_ASSERT_GV_FETCHMETH_AUTOLOAD;
566 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
567 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
569 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
572 if (!(CvROOT(cv) || CvXSUB(cv)))
574 /* Have an autoload */
575 if (level < 0) /* Cannot do without a stub */
576 gv_fetchmeth(stash, name, len, 0);
577 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
586 =for apidoc gv_fetchmethod_autoload
588 Returns the glob which contains the subroutine to call to invoke the method
589 on the C<stash>. In fact in the presence of autoloading this may be the
590 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
593 The third parameter of C<gv_fetchmethod_autoload> determines whether
594 AUTOLOAD lookup is performed if the given method is not present: non-zero
595 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
596 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
597 with a non-zero C<autoload> parameter.
599 These functions grant C<"SUPER"> token as a prefix of the method name. Note
600 that if you want to keep the returned glob for a long time, you need to
601 check for it being "AUTOLOAD", since at the later time the call may load a
602 different subroutine due to $AUTOLOAD changing its value. Use the glob
603 created via a side effect to do this.
605 These functions have the same side-effects and as C<gv_fetchmeth> with
606 C<level==0>. C<name> should be writable if contains C<':'> or C<'
607 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
608 C<call_sv> apply equally to these functions.
614 S_gv_get_super_pkg(pTHX_ const char* name, I32 namelen)
621 PERL_ARGS_ASSERT_GV_GET_SUPER_PKG;
623 stash = gv_stashpvn(name, namelen, 0);
624 if(stash) return stash;
626 /* If we must create it, give it an @ISA array containing
627 the real package this SUPER is for, so that it's tied
628 into the cache invalidation code correctly */
629 stash = gv_stashpvn(name, namelen, GV_ADD);
630 gvp = (GV**)hv_fetchs(stash, "ISA", TRUE);
632 gv_init(gv, stash, "ISA", 3, TRUE);
633 superisa = GvAVn(gv);
635 sv_magic(MUTABLE_SV(superisa), MUTABLE_SV(gv), PERL_MAGIC_isa, NULL, 0);
637 av_push(superisa, newSVpv(CopSTASHPV(PL_curcop), 0));
639 av_push(superisa, newSVhek(CopSTASH(PL_curcop)
640 ? HvNAME_HEK(CopSTASH(PL_curcop)) : NULL));
647 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
649 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
651 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
654 /* Don't merge this yet, as it's likely to get a len parameter, and possibly
657 Perl_gv_fetchmethod_flags(pTHX_ HV *stash, const char *name, U32 flags)
660 register const char *nend;
661 const char *nsplit = NULL;
664 const char * const origname = name;
665 SV *const error_report = MUTABLE_SV(stash);
666 const U32 autoload = flags & GV_AUTOLOAD;
667 const U32 do_croak = flags & GV_CROAK;
669 PERL_ARGS_ASSERT_GV_FETCHMETHOD_FLAGS;
671 if (SvTYPE(stash) < SVt_PVHV)
674 /* The only way stash can become NULL later on is if nsplit is set,
675 which in turn means that there is no need for a SVt_PVHV case
676 the error reporting code. */
679 for (nend = name; *nend; nend++) {
684 else if (*nend == ':' && *(nend + 1) == ':') {
690 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
691 /* ->SUPER::method should really be looked up in original stash */
692 SV * const tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
693 CopSTASHPV(PL_curcop)));
694 /* __PACKAGE__::SUPER stash should be autovivified */
695 stash = gv_get_super_pkg(SvPVX_const(tmpstr), SvCUR(tmpstr));
696 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
697 origname, HvNAME_get(stash), name) );
700 /* don't autovifify if ->NoSuchStash::method */
701 stash = gv_stashpvn(origname, nsplit - origname, 0);
703 /* however, explicit calls to Pkg::SUPER::method may
704 happen, and may require autovivification to work */
705 if (!stash && (nsplit - origname) >= 7 &&
706 strnEQ(nsplit - 7, "::SUPER", 7) &&
707 gv_stashpvn(origname, nsplit - origname - 7, 0))
708 stash = gv_get_super_pkg(origname, nsplit - origname);
713 gv = gv_fetchmeth(stash, name, nend - name, 0);
715 if (strEQ(name,"import") || strEQ(name,"unimport"))
716 gv = MUTABLE_GV(&PL_sv_yes);
718 gv = gv_autoload4(ostash, name, nend - name, TRUE);
719 if (!gv && do_croak) {
720 /* Right now this is exclusively for the benefit of S_method_common
723 /* If we can't find an IO::File method, it might be a call on
724 * a filehandle. If IO:File has not been loaded, try to
725 * require it first instead of croaking */
726 const char *stash_name = HvNAME_get(stash);
727 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
728 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
729 STR_WITH_LEN("IO/File.pm"), 0,
730 HV_FETCH_ISEXISTS, NULL, 0)
732 require_pv("IO/File.pm");
733 gv = gv_fetchmeth(stash, name, nend - name, 0);
738 "Can't locate object method \"%s\" via package \"%.*s\"",
739 name, (int)HvNAMELEN_get(stash), HvNAME_get(stash));
743 const char *packname;
746 packlen = nsplit - origname;
749 packname = SvPV_const(error_report, packlen);
753 "Can't locate object method \"%s\" via package \"%.*s\""
754 " (perhaps you forgot to load \"%.*s\"?)",
755 name, (int)packlen, packname, (int)packlen, packname);
760 CV* const cv = GvCV(gv);
761 if (!CvROOT(cv) && !CvXSUB(cv)) {
769 if (GvCV(stubgv) != cv) /* orphaned import */
772 autogv = gv_autoload4(GvSTASH(stubgv),
773 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
783 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
791 const char *packname = "";
792 STRLEN packname_len = 0;
794 PERL_ARGS_ASSERT_GV_AUTOLOAD4;
796 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
799 if (SvTYPE(stash) < SVt_PVHV) {
800 packname = SvPV_const(MUTABLE_SV(stash), packname_len);
804 packname = HvNAME_get(stash);
805 packname_len = HvNAMELEN_get(stash);
808 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
812 if (!(CvROOT(cv) || CvXSUB(cv)))
816 * Inheriting AUTOLOAD for non-methods works ... for now.
818 if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
820 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
821 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
822 packname, (int)len, name);
825 /* rather than lookup/init $AUTOLOAD here
826 * only to have the XSUB do another lookup for $AUTOLOAD
827 * and split that value on the last '::',
828 * pass along the same data via some unused fields in the CV
830 CvSTASH_set(cv, stash);
831 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
837 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
838 * The subroutine's original name may not be "AUTOLOAD", so we don't
839 * use that, but for lack of anything better we will use the sub's
840 * original package to look up $AUTOLOAD.
842 varstash = GvSTASH(CvGV(cv));
843 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
847 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
848 #ifdef PERL_DONT_CREATE_GVSV
849 GvSV(vargv) = newSV(0);
853 varsv = GvSVn(vargv);
854 sv_setpvn(varsv, packname, packname_len);
855 sv_catpvs(varsv, "::");
856 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
857 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
858 sv_catpvn_mg(varsv, name, len);
863 /* require_tie_mod() internal routine for requiring a module
864 * that implements the logic of automatic ties like %! and %-
866 * The "gv" parameter should be the glob.
867 * "varpv" holds the name of the var, used for error messages.
868 * "namesv" holds the module name. Its refcount will be decremented.
869 * "methpv" holds the method name to test for to check that things
870 * are working reasonably close to as expected.
871 * "flags": if flag & 1 then save the scalar before loading.
872 * For the protection of $! to work (it is set by this routine)
873 * the sv slot must already be magicalized.
876 S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
879 HV* stash = gv_stashsv(namesv, 0);
881 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
883 if (!stash || !(gv_fetchmethod(stash, methpv))) {
884 SV *module = newSVsv(namesv);
885 char varname = *varpv; /* varpv might be clobbered by load_module,
886 so save it. For the moment it's always
892 PUSHSTACKi(PERLSI_MAGIC);
893 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
897 stash = gv_stashsv(namesv, 0);
899 Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" is not available",
900 varname, SVfARG(namesv));
901 else if (!gv_fetchmethod(stash, methpv))
902 Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" does not support method %s",
903 varname, SVfARG(namesv), methpv);
905 SvREFCNT_dec(namesv);
910 =for apidoc gv_stashpv
912 Returns a pointer to the stash for a specified package. Uses C<strlen> to
913 determine the length of C<name>, then calls C<gv_stashpvn()>.
919 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
921 PERL_ARGS_ASSERT_GV_STASHPV;
922 return gv_stashpvn(name, strlen(name), create);
926 =for apidoc gv_stashpvn
928 Returns a pointer to the stash for a specified package. The C<namelen>
929 parameter indicates the length of the C<name>, in bytes. C<flags> is passed
930 to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
931 created if it does not already exist. If the package does not exist and
932 C<flags> is 0 (or any other setting that does not create packages) then NULL
940 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
946 U32 tmplen = namelen + 2;
948 PERL_ARGS_ASSERT_GV_STASHPVN;
950 if (tmplen <= sizeof smallbuf)
953 Newx(tmpbuf, tmplen, char);
954 Copy(name, tmpbuf, namelen, char);
955 tmpbuf[namelen] = ':';
956 tmpbuf[namelen+1] = ':';
957 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
958 if (tmpbuf != smallbuf)
963 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
965 if (!HvNAME_get(stash)) {
966 hv_name_set(stash, name, namelen, 0);
968 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
969 /* If the containing stash has multiple effective
970 names, see that this one gets them, too. */
971 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
972 mro_package_moved(stash, NULL, tmpgv, 1);
978 =for apidoc gv_stashsv
980 Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
986 Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
989 const char * const ptr = SvPV_const(sv,len);
991 PERL_ARGS_ASSERT_GV_STASHSV;
993 return gv_stashpvn(ptr, len, flags);
998 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
999 PERL_ARGS_ASSERT_GV_FETCHPV;
1000 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
1004 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
1006 const char * const nambeg = SvPV_const(name, len);
1007 PERL_ARGS_ASSERT_GV_FETCHSV;
1008 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1012 S_gv_magicalize_isa(pTHX_ GV *gv)
1016 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1020 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1025 S_gv_magicalize_overload(pTHX_ GV *gv)
1029 PERL_ARGS_ASSERT_GV_MAGICALIZE_OVERLOAD;
1033 hv_magic(hv, NULL, PERL_MAGIC_overload);
1037 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
1038 const svtype sv_type)
1041 register const char *name = nambeg;
1042 register GV *gv = NULL;
1045 register const char *name_cursor;
1047 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
1048 const I32 no_expand = flags & GV_NOEXPAND;
1049 const I32 add = flags & ~GV_NOADD_MASK;
1050 const char *const name_end = nambeg + full_len;
1051 const char *const name_em1 = name_end - 1;
1054 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
1056 if (flags & GV_NOTQUAL) {
1057 /* Caller promised that there is no stash, so we can skip the check. */
1062 if (full_len > 2 && *name == '*' && isALPHA(name[1])) {
1063 /* accidental stringify on a GV? */
1067 for (name_cursor = name; name_cursor < name_end; name_cursor++) {
1068 if (name_cursor < name_em1 &&
1069 ((*name_cursor == ':'
1070 && name_cursor[1] == ':')
1071 || *name_cursor == '\''))
1074 stash = PL_defstash;
1075 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
1078 len = name_cursor - name;
1079 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1081 if (*name_cursor == ':') {
1086 Newx(tmpbuf, len+2, char);
1087 Copy(name, tmpbuf, len, char);
1088 tmpbuf[len++] = ':';
1089 tmpbuf[len++] = ':';
1092 gvp = (GV**)hv_fetch(stash, key, len, add);
1093 gv = gvp ? *gvp : NULL;
1094 if (gv && gv != (const GV *)&PL_sv_undef) {
1095 if (SvTYPE(gv) != SVt_PVGV)
1096 gv_init(gv, stash, key, len, (add & GV_ADDMULTI));
1102 if (!gv || gv == (const GV *)&PL_sv_undef)
1105 if (!(stash = GvHV(gv)))
1107 stash = GvHV(gv) = newHV();
1108 if (!HvNAME_get(stash)) {
1109 if (GvSTASH(gv) == PL_defstash && len == 6
1110 && strnEQ(name, "CORE", 4))
1111 hv_name_set(stash, "CORE", 4, 0);
1114 stash, nambeg, name_cursor-nambeg, 0
1116 /* If the containing stash has multiple effective
1117 names, see that this one gets them, too. */
1118 if (HvAUX(GvSTASH(gv))->xhv_name_count)
1119 mro_package_moved(stash, NULL, gv, 1);
1122 else if (!HvNAME_get(stash))
1123 hv_name_set(stash, nambeg, name_cursor - nambeg, 0);
1126 if (*name_cursor == ':')
1128 name = name_cursor+1;
1129 if (name == name_end)
1131 ? gv : MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1134 len = name_cursor - name;
1136 /* No stash in name, so see how we can default */
1140 if (len && isIDFIRST_lazy(name)) {
1141 bool global = FALSE;
1149 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1150 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1151 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
1155 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1160 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1161 && name[3] == 'I' && name[4] == 'N')
1165 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1166 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1167 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
1171 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1172 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1179 stash = PL_defstash;
1180 else if (IN_PERL_COMPILETIME) {
1181 stash = PL_curstash;
1182 if (add && (PL_hints & HINT_STRICT_VARS) &&
1183 sv_type != SVt_PVCV &&
1184 sv_type != SVt_PVGV &&
1185 sv_type != SVt_PVFM &&
1186 sv_type != SVt_PVIO &&
1187 !(len == 1 && sv_type == SVt_PV &&
1188 (*name == 'a' || *name == 'b')) )
1190 gvp = (GV**)hv_fetch(stash,name,len,0);
1192 *gvp == (const GV *)&PL_sv_undef ||
1193 SvTYPE(*gvp) != SVt_PVGV)
1197 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1198 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1199 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1201 /* diag_listed_as: Variable "%s" is not imported%s */
1203 aTHX_ packWARN(WARN_MISC),
1204 "Variable \"%c%s\" is not imported",
1205 sv_type == SVt_PVAV ? '@' :
1206 sv_type == SVt_PVHV ? '%' : '$',
1210 aTHX_ packWARN(WARN_MISC),
1211 "\t(Did you mean &%s instead?)\n", name
1218 stash = CopSTASH(PL_curcop);
1221 stash = PL_defstash;
1224 /* By this point we should have a stash and a name */
1228 SV * const err = Perl_mess(aTHX_
1229 "Global symbol \"%s%s\" requires explicit package name",
1230 (sv_type == SVt_PV ? "$"
1231 : sv_type == SVt_PVAV ? "@"
1232 : sv_type == SVt_PVHV ? "%"
1235 if (USE_UTF8_IN_NAMES)
1238 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1240 /* symbol table under destruction */
1249 if (!SvREFCNT(stash)) /* symbol table under destruction */
1252 gvp = (GV**)hv_fetch(stash,name,len,add);
1253 if (!gvp || *gvp == (const GV *)&PL_sv_undef)
1256 if (SvTYPE(gv) == SVt_PVGV) {
1259 gv_init_sv(gv, sv_type);
1260 if (len == 1 && stash == PL_defstash
1261 && (sv_type == SVt_PVHV || sv_type == SVt_PVGV)) {
1263 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1264 else if (*name == '-' || *name == '+')
1265 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
1267 else if (len == 3 && sv_type == SVt_PVAV
1268 && strnEQ(name, "ISA", 3)
1269 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
1270 gv_magicalize_isa(gv);
1273 } else if (no_init) {
1275 } else if (no_expand && SvROK(gv)) {
1279 /* Adding a new symbol.
1280 Unless of course there was already something non-GV here, in which case
1281 we want to behave as if there was always a GV here, containing some sort
1283 Otherwise we run the risk of creating things like GvIO, which can cause
1284 subtle bugs. eg the one that tripped up SQL::Translator */
1286 faking_it = SvOK(gv);
1288 if (add & GV_ADDWARN)
1289 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
1290 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
1291 gv_init_sv(gv, faking_it ? SVt_PVCV : sv_type);
1293 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
1294 : (PL_dowarn & G_WARN_ON ) ) )
1297 /* set up magic where warranted */
1298 if (stash != PL_defstash) { /* not the main stash */
1299 /* We only have to check for four names here: EXPORT, ISA, OVERLOAD
1300 and VERSION. All the others apply only to the main stash. */
1302 const char * const name2 = name + 1;
1305 if (strnEQ(name2, "XPORT", 5))
1309 if (strEQ(name2, "SA"))
1310 gv_magicalize_isa(gv);
1313 if (strEQ(name2, "VERLOAD"))
1314 gv_magicalize_overload(gv);
1317 if (strEQ(name2, "ERSION"))
1327 /* Nothing else to do.
1328 The compiler will probably turn the switch statement into a
1329 branch table. Make sure we avoid even that small overhead for
1330 the common case of lower case variable names. */
1334 const char * const name2 = name + 1;
1337 if (strEQ(name2, "RGV")) {
1338 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1340 else if (strEQ(name2, "RGVOUT")) {
1345 if (strnEQ(name2, "XPORT", 5))
1349 if (strEQ(name2, "SA")) {
1350 gv_magicalize_isa(gv);
1354 if (strEQ(name2, "VERLOAD")) {
1355 gv_magicalize_overload(gv);
1359 if (strEQ(name2, "IG")) {
1362 if (!PL_psig_name) {
1363 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
1364 Newxz(PL_psig_pend, SIG_SIZE, int);
1365 PL_psig_ptr = PL_psig_name + SIG_SIZE;
1367 /* I think that the only way to get here is to re-use an
1368 embedded perl interpreter, where the previous
1369 use didn't clean up fully because
1370 PL_perl_destruct_level was 0. I'm not sure that we
1371 "support" that, in that I suspect in that scenario
1372 there are sufficient other garbage values left in the
1373 interpreter structure that something else will crash
1374 before we get here. I suspect that this is one of
1375 those "doctor, it hurts when I do this" bugs. */
1376 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
1377 Zero(PL_psig_pend, SIG_SIZE, int);
1381 hv_magic(hv, NULL, PERL_MAGIC_sig);
1382 for (i = 1; i < SIG_SIZE; i++) {
1383 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1385 sv_setsv(*init, &PL_sv_undef);
1390 if (strEQ(name2, "ERSION"))
1393 case '\003': /* $^CHILD_ERROR_NATIVE */
1394 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1397 case '\005': /* $^ENCODING */
1398 if (strEQ(name2, "NCODING"))
1401 case '\007': /* $^GLOBAL_PHASE */
1402 if (strEQ(name2, "LOBAL_PHASE"))
1405 case '\015': /* $^MATCH */
1406 if (strEQ(name2, "ATCH"))
1408 case '\017': /* $^OPEN */
1409 if (strEQ(name2, "PEN"))
1412 case '\020': /* $^PREMATCH $^POSTMATCH */
1413 if (strEQ(name2, "REMATCH") || strEQ(name2, "OSTMATCH"))
1416 case '\024': /* ${^TAINT} */
1417 if (strEQ(name2, "AINT"))
1420 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1421 if (strEQ(name2, "NICODE"))
1423 if (strEQ(name2, "TF8LOCALE"))
1425 if (strEQ(name2, "TF8CACHE"))
1428 case '\027': /* $^WARNING_BITS */
1429 if (strEQ(name2, "ARNING_BITS"))
1442 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1444 /* This snippet is taken from is_gv_magical */
1445 const char *end = name + len;
1446 while (--end > name) {
1447 if (!isDIGIT(*end)) return gv;
1454 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1455 be case '\0' in this switch statement (ie a default case) */
1461 sv_type == SVt_PVAV ||
1462 sv_type == SVt_PVHV ||
1463 sv_type == SVt_PVCV ||
1464 sv_type == SVt_PVFM ||
1467 PL_sawampersand = TRUE;
1471 sv_setpv(GvSVn(gv),PL_chopset);
1475 #ifdef COMPLEX_STATUS
1476 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1482 /* If %! has been used, automatically load Errno.pm. */
1484 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1486 /* magicalization must be done before require_tie_mod is called */
1487 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1488 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1493 GvMULTI_on(gv); /* no used once warnings here */
1495 AV* const av = GvAVn(gv);
1496 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
1498 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
1499 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1501 SvREADONLY_on(GvSVn(gv));
1504 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1505 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
1511 if (sv_type == SVt_PV)
1512 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1513 "$%c is no longer supported", *name);
1516 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1519 case '\010': /* $^H */
1521 HV *const hv = GvHVn(gv);
1522 hv_magic(hv, NULL, PERL_MAGIC_hints);
1525 case '\023': /* $^S */
1527 SvREADONLY_on(GvSVn(gv));
1552 case '\001': /* $^A */
1553 case '\003': /* $^C */
1554 case '\004': /* $^D */
1555 case '\005': /* $^E */
1556 case '\006': /* $^F */
1557 case '\011': /* $^I, NOT \t in EBCDIC */
1558 case '\016': /* $^N */
1559 case '\017': /* $^O */
1560 case '\020': /* $^P */
1561 case '\024': /* $^T */
1562 case '\027': /* $^W */
1564 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1567 case '\014': /* $^L */
1568 sv_setpvs(GvSVn(gv),"\f");
1569 PL_formfeed = GvSVn(gv);
1572 sv_setpvs(GvSVn(gv),"\034");
1576 SV * const sv = GvSVn(gv);
1577 if (!sv_derived_from(PL_patchlevel, "version"))
1578 upg_version(PL_patchlevel, TRUE);
1579 GvSV(gv) = vnumify(PL_patchlevel);
1580 SvREADONLY_on(GvSV(gv));
1584 case '\026': /* $^V */
1586 SV * const sv = GvSVn(gv);
1587 GvSV(gv) = new_version(PL_patchlevel);
1588 SvREADONLY_on(GvSV(gv));
1598 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1602 const HV * const hv = GvSTASH(gv);
1604 PERL_ARGS_ASSERT_GV_FULLNAME4;
1610 sv_setpv(sv, prefix ? prefix : "");
1612 name = HvNAME_get(hv);
1614 namelen = HvNAMELEN_get(hv);
1620 if (keepmain || strNE(name, "main")) {
1621 sv_catpvn(sv,name,namelen);
1624 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1628 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1630 const GV * const egv = GvEGVx(gv);
1632 PERL_ARGS_ASSERT_GV_EFULLNAME4;
1634 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1638 Perl_gv_check(pTHX_ const HV *stash)
1643 PERL_ARGS_ASSERT_GV_CHECK;
1645 if (!HvARRAY(stash))
1647 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1649 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1652 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1653 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
1655 if (hv != PL_defstash && hv != stash)
1656 gv_check(hv); /* nested package */
1658 else if (isALPHA(*HeKEY(entry))) {
1660 gv = MUTABLE_GV(HeVAL(entry));
1661 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1664 CopLINE_set(PL_curcop, GvLINE(gv));
1666 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1668 CopFILEGV(PL_curcop)
1669 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
1671 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1672 "Name \"%s::%s\" used only once: possible typo",
1673 HvNAME_get(stash), GvNAME(gv));
1680 Perl_newGVgen(pTHX_ const char *pack)
1684 PERL_ARGS_ASSERT_NEWGVGEN;
1686 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1690 /* hopefully this is only called on local symbol table entries */
1693 Perl_gp_ref(pTHX_ GP *gp)
1701 /* If the GP they asked for a reference to contains
1702 a method cache entry, clear it first, so that we
1703 don't infect them with our cached entry */
1704 SvREFCNT_dec(gp->gp_cv);
1713 Perl_gp_free(pTHX_ GV *gv)
1719 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
1721 if (gp->gp_refcnt == 0) {
1722 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
1723 "Attempt to free unreferenced glob pointers"
1724 pTHX__FORMAT pTHX__VALUE);
1727 if (--gp->gp_refcnt > 0) {
1728 if (gp->gp_egv == gv)
1735 /* Copy and null out all the glob slots, so destructors do not see
1737 HEK * const file_hek = gp->gp_file_hek;
1738 SV * const sv = gp->gp_sv;
1739 AV * const av = gp->gp_av;
1740 HV * const hv = gp->gp_hv;
1741 IO * const io = gp->gp_io;
1742 CV * const cv = gp->gp_cv;
1743 CV * const form = gp->gp_form;
1745 gp->gp_file_hek = NULL;
1754 unshare_hek(file_hek);
1758 /* FIXME - another reference loop GV -> symtab -> GV ?
1759 Somehow gp->gp_hv can end up pointing at freed garbage. */
1760 if (hv && SvTYPE(hv) == SVt_PVHV) {
1761 const char *hvname = HvNAME_get(hv);
1762 if (PL_stashcache && hvname)
1763 (void)hv_delete(PL_stashcache, hvname, HvNAMELEN_get(hv),
1771 if (!gp->gp_file_hek
1777 && !gp->gp_form) break;
1779 if (--attempts == 0) {
1781 "panic: gp_free failed to free glob pointer - "
1782 "something is repeatedly re-creating entries"
1792 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1794 AMT * const amtp = (AMT*)mg->mg_ptr;
1795 PERL_UNUSED_ARG(sv);
1797 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
1799 if (amtp && AMT_AMAGIC(amtp)) {
1801 for (i = 1; i < NofAMmeth; i++) {
1802 CV * const cv = amtp->table[i];
1804 SvREFCNT_dec(MUTABLE_SV(cv));
1805 amtp->table[i] = NULL;
1812 /* Updates and caches the CV's */
1814 * 1 on success and there is some overload
1815 * 0 if there is no overload
1816 * -1 if some error occurred and it couldn't croak
1820 Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
1823 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
1825 const struct mro_meta* stash_meta = HvMROMETA(stash);
1828 PERL_ARGS_ASSERT_GV_AMUPDATE;
1830 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
1832 const AMT * const amtp = (AMT*)mg->mg_ptr;
1833 if (amtp->was_ok_am == PL_amagic_generation
1834 && amtp->was_ok_sub == newgen) {
1835 return AMT_OVERLOADED(amtp) ? 1 : 0;
1837 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
1840 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1843 amt.was_ok_am = PL_amagic_generation;
1844 amt.was_ok_sub = newgen;
1845 amt.fallback = AMGfallNO;
1849 int filled = 0, have_ovl = 0;
1852 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1854 /* Try to find via inheritance. */
1855 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1856 SV * const sv = gv ? GvSV(gv) : NULL;
1860 lim = DESTROY_amg; /* Skip overloading entries. */
1861 #ifdef PERL_DONT_CREATE_GVSV
1863 NOOP; /* Equivalent to !SvTRUE and !SvOK */
1866 else if (SvTRUE(sv))
1867 amt.fallback=AMGfallYES;
1869 amt.fallback=AMGfallNEVER;
1871 for (i = 1; i < lim; i++)
1872 amt.table[i] = NULL;
1873 for (; i < NofAMmeth; i++) {
1874 const char * const cooky = PL_AMG_names[i];
1875 /* Human-readable form, for debugging: */
1876 const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1877 const STRLEN l = PL_AMG_namelens[i];
1879 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1880 cp, HvNAME_get(stash)) );
1881 /* don't fill the cache while looking up!
1882 Creation of inheritance stubs in intermediate packages may
1883 conflict with the logic of runtime method substitution.
1884 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1885 then we could have created stubs for "(+0" in A and C too.
1886 But if B overloads "bool", we may want to use it for
1887 numifying instead of C's "+0". */
1888 if (i >= DESTROY_amg)
1889 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1890 else /* Autoload taken care of below */
1891 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1893 if (gv && (cv = GvCV(gv))) {
1895 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1896 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1897 /* This is a hack to support autoloading..., while
1898 knowing *which* methods were declared as overloaded. */
1899 /* GvSV contains the name of the method. */
1901 SV *gvsv = GvSV(gv);
1903 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1904 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1905 (void*)GvSV(gv), cp, hvname) );
1906 if (!gvsv || !SvPOK(gvsv)
1907 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1910 /* Can be an import stub (created by "can"). */
1915 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1916 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1917 "in package \"%.256s\"",
1918 (GvCVGEN(gv) ? "Stub found while resolving"
1923 cv = GvCV(gv = ngv);
1925 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1926 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1927 GvNAME(CvGV(cv))) );
1929 if (i < DESTROY_amg)
1931 } else if (gv) { /* Autoloaded... */
1932 cv = MUTABLE_CV(gv);
1935 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
1938 AMT_AMAGIC_on(&amt);
1940 AMT_OVERLOADED_on(&amt);
1941 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
1942 (char*)&amt, sizeof(AMT));
1946 /* Here we have no table: */
1948 AMT_AMAGIC_off(&amt);
1949 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
1950 (char*)&amt, sizeof(AMTS));
1956 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1962 struct mro_meta* stash_meta;
1964 if (!stash || !HvNAME_get(stash))
1967 stash_meta = HvMROMETA(stash);
1968 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
1970 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
1973 /* If we're looking up a destructor to invoke, we must avoid
1974 * that Gv_AMupdate croaks, because we might be dying already */
1975 if (Gv_AMupdate(stash, cBOOL(id == DESTROY_amg)) == -1) {
1976 /* and if it didn't found a destructor, we fall back
1977 * to a simpler method that will only look for the
1978 * destructor instead of the whole magic */
1979 if (id == DESTROY_amg) {
1980 GV * const gv = gv_fetchmethod(stash, "DESTROY");
1986 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
1989 amtp = (AMT*)mg->mg_ptr;
1990 if ( amtp->was_ok_am != PL_amagic_generation
1991 || amtp->was_ok_sub != newgen )
1993 if (AMT_AMAGIC(amtp)) {
1994 CV * const ret = amtp->table[id];
1995 if (ret && isGV(ret)) { /* Autoloading stab */
1996 /* Passing it through may have resulted in a warning
1997 "Inherited AUTOLOAD for a non-method deprecated", since
1998 our caller is going through a function call, not a method call.
1999 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
2000 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
2012 /* Implement tryAMAGICun_MG macro.
2013 Do get magic, then see if the stack arg is overloaded and if so call it.
2015 AMGf_set return the arg using SETs rather than assigning to
2017 AMGf_numeric apply sv_2num to the stack arg.
2021 Perl_try_amagic_un(pTHX_ int method, int flags) {
2025 SV* const arg = TOPs;
2029 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2030 AMGf_noright | AMGf_unary))) {
2031 if (flags & AMGf_set) {
2036 if (SvPADMY(TARG)) {
2037 sv_setsv(TARG, tmpsv);
2047 if ((flags & AMGf_numeric) && SvROK(arg))
2053 /* Implement tryAMAGICbin_MG macro.
2054 Do get magic, then see if the two stack args are overloaded and if so
2057 AMGf_set return the arg using SETs rather than assigning to
2059 AMGf_assign op may be called as mutator (eg +=)
2060 AMGf_numeric apply sv_2num to the stack arg.
2064 Perl_try_amagic_bin(pTHX_ int method, int flags) {
2067 SV* const left = TOPm1s;
2068 SV* const right = TOPs;
2074 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2075 SV * const tmpsv = amagic_call(left, right, method,
2076 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2078 if (flags & AMGf_set) {
2085 if (opASSIGN || SvPADMY(TARG)) {
2086 sv_setsv(TARG, tmpsv);
2096 if(left==right && SvGMAGICAL(left)) {
2097 SV * const left = sv_newmortal();
2099 /* Print the uninitialized warning now, so it includes the vari-
2102 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2103 sv_setsv_flags(left, &PL_sv_no, 0);
2105 else sv_setsv_flags(left, right, 0);
2108 if (flags & AMGf_numeric) {
2110 *(sp-1) = sv_2num(TOPm1s);
2112 *sp = sv_2num(right);
2118 Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2121 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2123 while (SvAMAGIC(ref) &&
2124 (tmpsv = amagic_call(ref, &PL_sv_undef, method,
2125 AMGf_noright | AMGf_unary))) {
2127 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2128 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2129 /* Bail out if it returns us the same reference. */
2134 return tmpsv ? tmpsv : ref;
2138 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
2143 CV **cvp=NULL, **ocvp=NULL;
2144 AMT *amtp=NULL, *oamtp=NULL;
2145 int off = 0, off1, lr = 0, notfound = 0;
2146 int postpr = 0, force_cpy = 0;
2147 int assign = AMGf_assign & flags;
2148 const int assignshift = assign ? 1 : 0;
2149 int use_default_op = 0;
2155 PERL_ARGS_ASSERT_AMAGIC_CALL;
2157 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
2158 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2160 if ( !lex_mask || !SvOK(lex_mask) )
2161 /* overloading lexically disabled */
2163 else if ( lex_mask && SvPOK(lex_mask) ) {
2164 /* we have an entry in the hints hash, check if method has been
2165 * masked by overloading.pm */
2167 const int offset = method / 8;
2168 const int bit = method % 8;
2169 char *pv = SvPV(lex_mask, len);
2171 /* Bit set, so this overloading operator is disabled */
2172 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2177 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
2178 && (stash = SvSTASH(SvRV(left)))
2179 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
2180 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
2181 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
2183 && ((cv = cvp[off=method+assignshift])
2184 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2190 cv = cvp[off=method])))) {
2191 lr = -1; /* Call method for left argument */
2193 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2196 /* look for substituted methods */
2197 /* In all the covered cases we should be called with assign==0. */
2201 if ((cv = cvp[off=add_ass_amg])
2202 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
2203 right = &PL_sv_yes; lr = -1; assign = 1;
2208 if ((cv = cvp[off = subtr_ass_amg])
2209 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
2210 right = &PL_sv_yes; lr = -1; assign = 1;
2214 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
2217 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
2220 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
2223 (void)((cv = cvp[off=bool__amg])
2224 || (cv = cvp[off=numer_amg])
2225 || (cv = cvp[off=string_amg]));
2232 * SV* ref causes confusion with the interpreter variable of
2235 SV* const tmpRef=SvRV(left);
2236 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
2238 * Just to be extra cautious. Maybe in some
2239 * additional cases sv_setsv is safe, too.
2241 SV* const newref = newSVsv(tmpRef);
2242 SvOBJECT_on(newref);
2243 /* As a bit of a source compatibility hack, SvAMAGIC() and
2244 friends dereference an RV, to behave the same was as when
2245 overloading was stored on the reference, not the referant.
2246 Hence we can't use SvAMAGIC_on()
2248 SvFLAGS(newref) |= SVf_AMAGIC;
2249 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
2255 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
2256 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
2257 SV* const nullsv=sv_2mortal(newSViv(0));
2259 SV* const lessp = amagic_call(left,nullsv,
2260 lt_amg,AMGf_noright);
2261 logic = SvTRUE(lessp);
2263 SV* const lessp = amagic_call(left,nullsv,
2264 ncmp_amg,AMGf_noright);
2265 logic = (SvNV(lessp) < 0);
2268 if (off==subtr_amg) {
2279 if ((cv = cvp[off=subtr_amg])) {
2281 left = sv_2mortal(newSViv(0));
2286 case iter_amg: /* XXXX Eventually should do to_gv. */
2287 case ftest_amg: /* XXXX Eventually should do to_gv. */
2290 return NULL; /* Delegate operation to standard mechanisms. */
2298 return left; /* Delegate operation to standard mechanisms. */
2303 if (!cv) goto not_found;
2304 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
2305 && (stash = SvSTASH(SvRV(right)))
2306 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
2307 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
2308 ? (amtp = (AMT*)mg->mg_ptr)->table
2310 && (cv = cvp[off=method])) { /* Method for right
2313 } else if (((cvp && amtp->fallback > AMGfallNEVER)
2314 || (ocvp && oamtp->fallback > AMGfallNEVER))
2315 && !(flags & AMGf_unary)) {
2316 /* We look for substitution for
2317 * comparison operations and
2319 if (method==concat_amg || method==concat_ass_amg
2320 || method==repeat_amg || method==repeat_ass_amg) {
2321 return NULL; /* Delegate operation to string conversion */
2343 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
2347 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
2357 not_found: /* No method found, either report or croak */
2365 return left; /* Delegate operation to standard mechanisms. */
2368 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
2369 notfound = 1; lr = -1;
2370 } else if (cvp && (cv=cvp[nomethod_amg])) {
2371 notfound = 1; lr = 1;
2372 } else if ((use_default_op =
2373 (!ocvp || oamtp->fallback >= AMGfallYES)
2374 && (!cvp || amtp->fallback >= AMGfallYES))
2376 /* Skip generating the "no method found" message. */
2380 if (off==-1) off=method;
2381 msg = sv_2mortal(Perl_newSVpvf(aTHX_
2382 "Operation \"%s\": no method found,%sargument %s%s%s%s",
2383 AMG_id2name(method + assignshift),
2384 (flags & AMGf_unary ? " " : "\n\tleft "),
2386 "in overloaded package ":
2387 "has no overloaded magic",
2389 HvNAME_get(SvSTASH(SvRV(left))):
2392 ",\n\tright argument in overloaded package ":
2395 : ",\n\tright argument has no overloaded magic"),
2397 HvNAME_get(SvSTASH(SvRV(right))):
2399 if (use_default_op) {
2400 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
2402 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
2406 force_cpy = force_cpy || assign;
2411 DEBUG_o(Perl_deb(aTHX_
2412 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
2414 method+assignshift==off? "" :
2416 method+assignshift==off? "" :
2417 AMG_id2name(method+assignshift),
2418 method+assignshift==off? "" : "\")",
2419 flags & AMGf_unary? "" :
2420 lr==1 ? " for right argument": " for left argument",
2421 flags & AMGf_unary? " for argument" : "",
2422 stash ? HvNAME_get(stash) : "null",
2423 fl? ",\n\tassignment variant used": "") );
2426 /* Since we use shallow copy during assignment, we need
2427 * to dublicate the contents, probably calling user-supplied
2428 * version of copy operator
2430 /* We need to copy in following cases:
2431 * a) Assignment form was called.
2432 * assignshift==1, assign==T, method + 1 == off
2433 * b) Increment or decrement, called directly.
2434 * assignshift==0, assign==0, method + 0 == off
2435 * c) Increment or decrement, translated to assignment add/subtr.
2436 * assignshift==0, assign==T,
2438 * d) Increment or decrement, translated to nomethod.
2439 * assignshift==0, assign==0,
2441 * e) Assignment form translated to nomethod.
2442 * assignshift==1, assign==T, method + 1 != off
2445 /* off is method, method+assignshift, or a result of opcode substitution.
2446 * In the latter case assignshift==0, so only notfound case is important.
2448 if (( (method + assignshift == off)
2449 && (assign || (method == inc_amg) || (method == dec_amg)))
2452 /* newSVsv does not behave as advertised, so we copy missing
2453 * information by hand */
2454 SV *tmpRef = SvRV(left);
2456 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
2457 SvRV_set(left, rv_copy);
2459 SvREFCNT_dec(tmpRef);
2467 const bool oldcatch = CATCH_GET;
2470 Zero(&myop, 1, BINOP);
2471 myop.op_last = (OP *) &myop;
2472 myop.op_next = NULL;
2473 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
2475 PUSHSTACKi(PERLSI_OVERLOAD);
2478 PL_op = (OP *) &myop;
2479 if (PERLDB_SUB && PL_curstash != PL_debstash)
2480 PL_op->op_private |= OPpENTERSUB_DB;
2482 Perl_pp_pushmark(aTHX);
2484 EXTEND(SP, notfound + 5);
2485 PUSHs(lr>0? right: left);
2486 PUSHs(lr>0? left: right);
2487 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
2489 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
2490 AMG_id2namelen(method + assignshift), SVs_TEMP));
2492 PUSHs(MUTABLE_SV(cv));
2495 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
2503 CATCH_SET(oldcatch);
2510 ans=SvIV(res)<=0; break;
2513 ans=SvIV(res)<0; break;
2516 ans=SvIV(res)>=0; break;
2519 ans=SvIV(res)>0; break;
2522 ans=SvIV(res)==0; break;
2525 ans=SvIV(res)!=0; break;
2528 SvSetSV(left,res); return left;
2530 ans=!SvTRUE(res); break;
2535 } else if (method==copy_amg) {
2537 Perl_croak(aTHX_ "Copy method did not return a reference");
2539 return SvREFCNT_inc(SvRV(res));
2547 =for apidoc is_gv_magical_sv
2549 Returns C<TRUE> if given the name of a magical GV.
2551 Currently only useful internally when determining if a GV should be
2552 created even in rvalue contexts.
2554 C<flags> is not used at present but available for future extension to
2555 allow selecting particular classes of magical variable.
2557 Currently assumes that C<name> is NUL terminated (as well as len being valid).
2558 This assumption is met by all callers within the perl core, which all pass
2559 pointers returned by SvPV.
2565 Perl_is_gv_magical_sv(pTHX_ SV *const name_sv, U32 flags)
2568 const char *const name = SvPV_const(name_sv, len);
2570 PERL_UNUSED_ARG(flags);
2571 PERL_ARGS_ASSERT_IS_GV_MAGICAL_SV;
2574 const char * const name1 = name + 1;
2577 if (len == 3 && name[1] == 'S' && name[2] == 'A')
2581 if (len == 8 && strEQ(name1, "VERLOAD"))
2585 if (len == 3 && name[1] == 'I' && name[2] == 'G')
2588 /* Using ${^...} variables is likely to be sufficiently rare that
2589 it seems sensible to avoid the space hit of also checking the
2591 case '\017': /* ${^OPEN} */
2592 if (strEQ(name1, "PEN"))
2595 case '\024': /* ${^TAINT} */
2596 if (strEQ(name1, "AINT"))
2599 case '\025': /* ${^UNICODE} */
2600 if (strEQ(name1, "NICODE"))
2602 if (strEQ(name1, "TF8LOCALE"))
2605 case '\027': /* ${^WARNING_BITS} */
2606 if (strEQ(name1, "ARNING_BITS"))
2619 const char *end = name + len;
2620 while (--end > name) {
2628 /* Because we're already assuming that name is NUL terminated
2629 below, we can treat an empty name as "\0" */
2655 case '\001': /* $^A */
2656 case '\003': /* $^C */
2657 case '\004': /* $^D */
2658 case '\005': /* $^E */
2659 case '\006': /* $^F */
2660 case '\010': /* $^H */
2661 case '\011': /* $^I, NOT \t in EBCDIC */
2662 case '\014': /* $^L */
2663 case '\016': /* $^N */
2664 case '\017': /* $^O */
2665 case '\020': /* $^P */
2666 case '\023': /* $^S */
2667 case '\024': /* $^T */
2668 case '\026': /* $^V */
2669 case '\027': /* $^W */
2689 Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
2694 PERL_ARGS_ASSERT_GV_NAME_SET;
2695 PERL_UNUSED_ARG(flags);
2698 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
2700 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
2701 unshare_hek(GvNAME_HEK(gv));
2704 PERL_HASH(hash, name, len);
2705 GvNAME_HEK(gv) = share_hek(name, len, hash);
2709 =for apidoc gv_try_downgrade
2711 If the typeglob C<gv> can be expressed more succinctly, by having
2712 something other than a real GV in its place in the stash, replace it
2713 with the optimised form. Basic requirements for this are that C<gv>
2714 is a real typeglob, is sufficiently ordinary, and is only referenced
2715 from its package. This function is meant to be used when a GV has been
2716 looked up in part to see what was there, causing upgrading, but based
2717 on what was found it turns out that the real GV isn't required after all.
2719 If C<gv> is a completely empty typeglob, it is deleted from the stash.
2721 If C<gv> is a typeglob containing only a sufficiently-ordinary constant
2722 sub, the typeglob is replaced with a scalar-reference placeholder that
2723 more compactly represents the same thing.
2729 Perl_gv_try_downgrade(pTHX_ GV *gv)
2735 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
2737 /* XXX Why and where does this leave dangling pointers during global
2739 if (PL_phase == PERL_PHASE_DESTRUCT) return;
2741 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
2742 !SvOBJECT(gv) && !SvREADONLY(gv) &&
2743 isGV_with_GP(gv) && GvGP(gv) &&
2744 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
2745 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
2746 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2748 if (SvMAGICAL(gv)) {
2750 /* only backref magic is allowed */
2751 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
2753 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
2754 if (mg->mg_type != PERL_MAGIC_backref)
2760 HEK *gvnhek = GvNAME_HEK(gv);
2761 (void)hv_delete(stash, HEK_KEY(gvnhek),
2762 HEK_UTF8(gvnhek) ? -HEK_LEN(gvnhek) : HEK_LEN(gvnhek), G_DISCARD);
2763 } else if (GvMULTI(gv) && cv &&
2764 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
2765 CvSTASH(cv) == stash && CvGV(cv) == gv &&
2766 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
2767 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
2768 (namehek = GvNAME_HEK(gv)) &&
2769 (gvp = hv_fetch(stash, HEK_KEY(namehek),
2770 HEK_LEN(namehek)*(HEK_UTF8(namehek) ? -1 : 1), 0)) &&
2772 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
2776 SvFLAGS(gv) = SVt_IV|SVf_ROK;
2777 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
2778 STRUCT_OFFSET(XPVIV, xiv_iv));
2779 SvRV_set(gv, value);
2785 * c-indentation-style: bsd
2787 * indent-tabs-mode: t
2790 * ex: set ts=8 sts=4 sw=4 noet: