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"]
24 A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
25 It is a structure that holds a pointer to a scalar, an array, a hash etc,
26 corresponding to $foo, @foo, %foo.
28 GVs are usually found as values in stashes (symbol table hashes) where
29 Perl stores its global variables.
41 static const char S_autoload[] = "AUTOLOAD";
42 static const STRLEN S_autolen = sizeof(S_autoload)-1;
45 Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
52 SvTYPE((const SV *)gv) != SVt_PVGV
53 && SvTYPE((const SV *)gv) != SVt_PVLV
57 if (type == SVt_PVIO) {
59 * if it walks like a dirhandle, then let's assume that
60 * this is a dirhandle.
62 what = OP_IS_DIRHOP(PL_op->op_type) ?
63 "dirhandle" : "filehandle";
64 } else if (type == SVt_PVHV) {
67 what = type == SVt_PVAV ? "array" : "scalar";
69 /* diag_listed_as: Bad symbol for filehandle */
70 Perl_croak(aTHX_ "Bad symbol for %s", what);
73 if (type == SVt_PVHV) {
74 where = (SV **)&GvHV(gv);
75 } else if (type == SVt_PVAV) {
76 where = (SV **)&GvAV(gv);
77 } else if (type == SVt_PVIO) {
78 where = (SV **)&GvIOp(gv);
85 *where = newSV_type(type);
86 if (type == SVt_PVAV && GvNAMELEN(gv) == 3
87 && strnEQ(GvNAME(gv), "ISA", 3))
88 sv_magic(*where, (SV *)gv, PERL_MAGIC_isa, NULL, 0);
94 Perl_gv_fetchfile(pTHX_ const char *name)
96 PERL_ARGS_ASSERT_GV_FETCHFILE;
97 return gv_fetchfile_flags(name, strlen(name), 0);
101 Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
106 const STRLEN tmplen = namelen + 2;
109 PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS;
110 PERL_UNUSED_ARG(flags);
115 if (tmplen <= sizeof smallbuf)
118 Newx(tmpbuf, tmplen, char);
119 /* This is where the debugger's %{"::_<$filename"} hash is created */
122 memcpy(tmpbuf + 2, name, namelen);
123 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
125 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
126 #ifdef PERL_DONT_CREATE_GVSV
127 GvSV(gv) = newSVpvn(name, namelen);
129 sv_setpvn(GvSV(gv), name, namelen);
132 if ((PERLDB_LINE || PERLDB_SAVESRC) && !GvAV(gv))
133 hv_magic(GvHVn(gv), GvAVn(gv), PERL_MAGIC_dbfile);
134 if (tmpbuf != smallbuf)
140 =for apidoc gv_const_sv
142 If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
143 inlining, or C<gv> is a placeholder reference that would be promoted to such
144 a typeglob, then returns the value returned by the sub. Otherwise, returns
151 Perl_gv_const_sv(pTHX_ GV *gv)
153 PERL_ARGS_ASSERT_GV_CONST_SV;
156 if (SvTYPE(gv) == SVt_PVGV)
157 return cv_const_sv(GvCVu(gv));
158 return SvROK(gv) && SvTYPE(SvRV(gv)) != SVt_PVAV ? SvRV(gv) : NULL;
162 Perl_newGP(pTHX_ GV *const gv)
173 PERL_ARGS_ASSERT_NEWGP;
175 gp->gp_egv = gv; /* allow compiler to reuse gv after this */
176 #ifndef PERL_DONT_CREATE_GVSV
177 gp->gp_sv = newSV(0);
180 /* PL_curcop may be null here. E.g.,
181 INIT { bless {} and exit }
182 frees INIT before looking up DESTROY (and creating *DESTROY)
185 gp->gp_line = CopLINE(PL_curcop); /* 0 otherwise Newxz */
187 if (CopFILE(PL_curcop)) {
188 file = CopFILE(PL_curcop);
192 filegv = CopFILEGV(PL_curcop);
194 file = GvNAME(filegv)+2;
195 len = GvNAMELEN(filegv)-2;
206 PERL_HASH(hash, file, len);
207 gp->gp_file_hek = share_hek(file, len, hash);
213 /* Assign CvGV(cv) = gv, handling weak references.
214 * See also S_anonymise_cv_maybe */
217 Perl_cvgv_set(pTHX_ CV* cv, GV* gv)
219 GV * const oldgv = CvGV(cv);
221 PERL_ARGS_ASSERT_CVGV_SET;
228 SvREFCNT_dec_NN(oldgv);
232 sv_del_backref(MUTABLE_SV(oldgv), MUTABLE_SV(cv));
235 else if ((hek = CvNAME_HEK(cv))) unshare_hek(hek);
237 SvANY(cv)->xcv_gv_u.xcv_gv = gv;
238 assert(!CvCVGV_RC(cv));
243 if (isGV_with_GP(gv) && GvGP(gv) && (GvCV(gv) == cv || GvFORM(gv) == cv))
244 Perl_sv_add_backref(aTHX_ MUTABLE_SV(gv), MUTABLE_SV(cv));
247 SvREFCNT_inc_simple_void_NN(gv);
251 /* Assign CvSTASH(cv) = st, handling weak references. */
254 Perl_cvstash_set(pTHX_ CV *cv, HV *st)
256 HV *oldst = CvSTASH(cv);
257 PERL_ARGS_ASSERT_CVSTASH_SET;
261 sv_del_backref(MUTABLE_SV(oldst), MUTABLE_SV(cv));
262 SvANY(cv)->xcv_stash = st;
264 Perl_sv_add_backref(aTHX_ MUTABLE_SV(st), MUTABLE_SV(cv));
268 =for apidoc gv_init_pvn
270 Converts a scalar into a typeglob. This is an incoercible typeglob;
271 assigning a reference to it will assign to one of its slots, instead of
272 overwriting it as happens with typeglobs created by SvSetSV. Converting
273 any scalar that is SvOK() may produce unpredictable results and is reserved
274 for perl's internal use.
276 C<gv> is the scalar to be converted.
278 C<stash> is the parent stash/package, if any.
280 C<name> and C<len> give the name. The name must be unqualified;
281 that is, it must not include the package name. If C<gv> is a
282 stash element, it is the caller's responsibility to ensure that the name
283 passed to this function matches the name of the element. If it does not
284 match, perl's internal bookkeeping will get out of sync.
286 C<flags> can be set to SVf_UTF8 if C<name> is a UTF8 string, or
287 the return value of SvUTF8(sv). It can also take the
288 GV_ADDMULTI flag, which means to pretend that the GV has been
289 seen before (i.e., suppress "Used once" warnings).
293 The old form of gv_init_pvn(). It does not work with UTF8 strings, as it
294 has no flags parameter. If the C<multi> parameter is set, the
295 GV_ADDMULTI flag will be passed to gv_init_pvn().
297 =for apidoc gv_init_pv
299 Same as gv_init_pvn(), but takes a nul-terminated string for the name
300 instead of separate char * and length parameters.
302 =for apidoc gv_init_sv
304 Same as gv_init_pvn(), but takes an SV * for the name instead of separate
305 char * and length parameters. C<flags> is currently unused.
311 Perl_gv_init_sv(pTHX_ GV *gv, HV *stash, SV* namesv, U32 flags)
315 PERL_ARGS_ASSERT_GV_INIT_SV;
316 namepv = SvPV(namesv, namelen);
319 gv_init_pvn(gv, stash, namepv, namelen, flags);
323 Perl_gv_init_pv(pTHX_ GV *gv, HV *stash, const char *name, U32 flags)
325 PERL_ARGS_ASSERT_GV_INIT_PV;
326 gv_init_pvn(gv, stash, name, strlen(name), flags);
330 Perl_gv_init_pvn(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, U32 flags)
332 const U32 old_type = SvTYPE(gv);
333 const bool doproto = old_type > SVt_NULL;
334 char * const proto = (doproto && SvPOK(gv))
335 ? ((void)(SvIsCOW(gv) && (sv_force_normal((SV *)gv), 0)), SvPVX(gv))
337 const STRLEN protolen = proto ? SvCUR(gv) : 0;
338 const U32 proto_utf8 = proto ? SvUTF8(gv) : 0;
339 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
340 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
342 PERL_ARGS_ASSERT_GV_INIT_PVN;
343 assert (!(proto && has_constant));
346 /* The constant has to be a simple scalar type. */
347 switch (SvTYPE(has_constant)) {
352 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
353 sv_reftype(has_constant, 0));
362 if (old_type < SVt_PVGV) {
363 if (old_type >= SVt_PV)
365 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
373 Safefree(SvPVX_mutable(gv));
378 GvGP_set(gv, Perl_newGP(aTHX_ gv));
381 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
382 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
383 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
384 GvMULTI_on(gv); /* _was_ mentioned */
388 /* newCONSTSUB takes ownership of the reference from us. */
389 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
390 /* In case op.c:S_process_special_blocks stole it: */
392 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
393 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
394 /* If this reference was a copy of another, then the subroutine
395 must have been "imported", by a Perl space assignment to a GV
396 from a reference to CV. */
397 if (exported_constant)
398 GvIMPORTED_CV_on(gv);
399 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
404 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
405 SV_HAS_TRAILING_NUL);
406 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
412 S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
414 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
426 #ifdef PERL_DONT_CREATE_GVSV
434 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
435 If we just cast GvSVn(gv) to void, it ignores evaluating it for
442 static void core_xsub(pTHX_ CV* cv);
445 S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
446 const char * const name, const STRLEN len)
448 const int code = keyword(name, len, 1);
449 static const char file[] = __FILE__;
450 CV *cv, *oldcompcv = NULL;
452 bool ampable = TRUE; /* &{}-able */
453 COP *oldcurcop = NULL;
454 yy_parser *oldparser = NULL;
455 I32 oldsavestack_ix = 0;
460 if (!code) return NULL; /* Not a keyword */
461 switch (code < 0 ? -code : code) {
462 /* no support for \&CORE::infix;
463 no support for funcs that do not parse like funcs */
464 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
465 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp:
466 case KEY_default : case KEY_DESTROY:
467 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
468 case KEY_END : case KEY_eq : case KEY_eval :
469 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
470 case KEY_given : case KEY_goto : case KEY_grep :
471 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
472 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
473 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
474 case KEY_package: case KEY_print: case KEY_printf:
475 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
476 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
477 case KEY_s : case KEY_say : case KEY_sort :
478 case KEY_state: case KEY_sub :
479 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
480 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
481 case KEY_x : case KEY_xor : case KEY_y :
484 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
485 case KEY_each : case KEY_eof : case KEY_exec : case KEY_exists:
491 case KEY_splice: case KEY_split:
494 case KEY_truncate: case KEY_unlink:
501 gv_init(gv, stash, name, len, TRUE);
506 oldcurcop = PL_curcop;
507 oldparser = PL_parser;
508 lex_start(NULL, NULL, 0);
509 oldcompcv = PL_compcv;
510 PL_compcv = NULL; /* Prevent start_subparse from setting
512 oldsavestack_ix = start_subparse(FALSE,0);
516 /* Avoid calling newXS, as it calls us, and things start to
518 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
522 CvXSUB(cv) = core_xsub;
524 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
526 (void)gv_fetchfile(file);
527 CvFILE(cv) = (char *)file;
528 /* XXX This is inefficient, as doing things this order causes
529 a prototype check in newATTRSUB. But we have to do
530 it this order as we need an op number before calling
532 (void)core_prototype((SV *)cv, name, code, &opnum);
534 (void)hv_store(stash,name,len,(SV *)gv,0);
540 /* newATTRSUB will free the CV and return NULL if we're still
541 compiling after a syntax error */
542 if ((cv = newATTRSUB_x(
543 oldsavestack_ix, (OP *)gv,
548 : newSVpvn(name,len),
553 assert(GvCV(gv) == orig_cv);
554 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
555 && opnum != OP_UNDEF)
556 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
559 PL_parser = oldparser;
560 PL_curcop = oldcurcop;
561 PL_compcv = oldcompcv;
564 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
566 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
568 SvREFCNT_dec(opnumsv);
575 =for apidoc gv_fetchmeth
577 Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
579 =for apidoc gv_fetchmeth_sv
581 Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
582 of an SV instead of a string/length pair.
588 Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
592 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
593 namepv = SvPV(namesv, namelen);
596 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
600 =for apidoc gv_fetchmeth_pv
602 Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
603 instead of a string/length pair.
609 Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
611 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
612 return gv_fetchmeth_pvn(stash, name, strlen(name), level, flags);
616 =for apidoc gv_fetchmeth_pvn
618 Returns the glob with the given C<name> and a defined subroutine or
619 C<NULL>. The glob lives in the given C<stash>, or in the stashes
620 accessible via @ISA and UNIVERSAL::.
622 The argument C<level> should be either 0 or -1. If C<level==0>, as a
623 side-effect creates a glob with the given C<name> in the given C<stash>
624 which in the case of success contains an alias for the subroutine, and sets
625 up caching info for this glob.
627 The only significant values for C<flags> are GV_SUPER and SVf_UTF8.
629 GV_SUPER indicates that we want to look up the method in the superclasses
633 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
634 visible to Perl code. So when calling C<call_sv>, you should not use
635 the GV directly; instead, you should use the method's CV, which can be
636 obtained from the GV with the C<GvCV> macro.
641 /* NOTE: No support for tied ISA */
644 Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
650 HV* cstash, *cachestash;
651 GV* candidate = NULL;
655 I32 create = (level >= 0) ? 1 : 0;
658 U32 is_utf8 = flags & SVf_UTF8;
660 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
662 /* UNIVERSAL methods should be callable without a stash */
664 create = 0; /* probably appropriate */
665 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
671 hvname = HvNAME_get(stash);
673 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
678 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
679 flags & GV_SUPER ? "SUPER " : "",name,hvname) );
681 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
683 if (flags & GV_SUPER) {
684 if (!HvAUX(stash)->xhv_mro_meta->super)
685 HvAUX(stash)->xhv_mro_meta->super = newHV();
686 cachestash = HvAUX(stash)->xhv_mro_meta->super;
688 else cachestash = stash;
690 /* check locally for a real method or a cache entry */
691 gvp = (GV**)hv_fetch(cachestash, name, is_utf8 ? -(I32)len : (I32)len,
697 if (SvTYPE(topgv) != SVt_PVGV)
698 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
699 if ((cand_cv = GvCV(topgv))) {
700 /* If genuine method or valid cache entry, use it */
701 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
705 /* stale cache entry, junk it and move on */
706 SvREFCNT_dec_NN(cand_cv);
707 GvCV_set(topgv, NULL);
712 else if (GvCVGEN(topgv) == topgen_cmp) {
713 /* cache indicates no such method definitively */
716 else if (stash == cachestash
717 && len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
718 && strnEQ(hvname, "CORE", 4)
719 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
723 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
724 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
725 items = AvFILLp(linear_av); /* no +1, to skip over self */
727 linear_sv = *linear_svp++;
729 cstash = gv_stashsv(linear_sv, 0);
732 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
733 "Can't locate package %"SVf" for @%"HEKf"::ISA",
735 HEKfARG(HvNAME_HEK(stash)));
741 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
743 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
744 const char *hvname = HvNAME(cstash); assert(hvname);
745 if (strnEQ(hvname, "CORE", 4)
747 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
753 else candidate = *gvp;
756 if (SvTYPE(candidate) != SVt_PVGV)
757 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
758 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
760 * Found real method, cache method in topgv if:
761 * 1. topgv has no synonyms (else inheritance crosses wires)
762 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
764 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
765 CV *old_cv = GvCV(topgv);
766 SvREFCNT_dec(old_cv);
767 SvREFCNT_inc_simple_void_NN(cand_cv);
768 GvCV_set(topgv, cand_cv);
769 GvCVGEN(topgv) = topgen_cmp;
775 /* Check UNIVERSAL without caching */
776 if(level == 0 || level == -1) {
777 candidate = gv_fetchmeth_pvn(NULL, name, len, 1, flags &~GV_SUPER);
779 cand_cv = GvCV(candidate);
780 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
781 CV *old_cv = GvCV(topgv);
782 SvREFCNT_dec(old_cv);
783 SvREFCNT_inc_simple_void_NN(cand_cv);
784 GvCV_set(topgv, cand_cv);
785 GvCVGEN(topgv) = topgen_cmp;
791 if (topgv && GvREFCNT(topgv) == 1) {
792 /* cache the fact that the method is not defined */
793 GvCVGEN(topgv) = topgen_cmp;
800 =for apidoc gv_fetchmeth_autoload
802 This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
805 =for apidoc gv_fetchmeth_sv_autoload
807 Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
808 of an SV instead of a string/length pair.
814 Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
818 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
819 namepv = SvPV(namesv, namelen);
822 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
826 =for apidoc gv_fetchmeth_pv_autoload
828 Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
829 instead of a string/length pair.
835 Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
837 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
838 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
842 =for apidoc gv_fetchmeth_pvn_autoload
844 Same as gv_fetchmeth_pvn(), but looks for autoloaded subroutines too.
845 Returns a glob for the subroutine.
847 For an autoloaded subroutine without a GV, will create a GV even
848 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
849 of the result may be zero.
851 Currently, the only significant value for C<flags> is SVf_UTF8.
857 Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
859 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
861 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
868 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
869 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
871 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
874 if (!(CvROOT(cv) || CvXSUB(cv)))
876 /* Have an autoload */
877 if (level < 0) /* Cannot do without a stub */
878 gv_fetchmeth_pvn(stash, name, len, 0, flags);
879 gvp = (GV**)hv_fetch(stash, name,
880 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
889 =for apidoc gv_fetchmethod_autoload
891 Returns the glob which contains the subroutine to call to invoke the method
892 on the C<stash>. In fact in the presence of autoloading this may be the
893 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
896 The third parameter of C<gv_fetchmethod_autoload> determines whether
897 AUTOLOAD lookup is performed if the given method is not present: non-zero
898 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
899 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
900 with a non-zero C<autoload> parameter.
902 These functions grant C<"SUPER"> token
903 as a prefix of the method name. Note
904 that if you want to keep the returned glob for a long time, you need to
905 check for it being "AUTOLOAD", since at the later time the call may load a
906 different subroutine due to $AUTOLOAD changing its value. Use the glob
907 created as a side effect to do this.
909 These functions have the same side-effects as C<gv_fetchmeth> with
910 C<level==0>. The warning against passing the GV returned by
911 C<gv_fetchmeth> to C<call_sv> applies equally to these functions.
917 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
919 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
921 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
925 Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
929 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
930 namepv = SvPV(namesv, namelen);
933 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
937 Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
939 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
940 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
943 /* Don't merge this yet, as it's likely to get a len parameter, and possibly
946 Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
949 const char *nsplit = NULL;
952 const char * const origname = name;
953 SV *const error_report = MUTABLE_SV(stash);
954 const U32 autoload = flags & GV_AUTOLOAD;
955 const U32 do_croak = flags & GV_CROAK;
956 const U32 is_utf8 = flags & SVf_UTF8;
958 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
960 if (SvTYPE(stash) < SVt_PVHV)
963 /* The only way stash can become NULL later on is if nsplit is set,
964 which in turn means that there is no need for a SVt_PVHV case
965 the error reporting code. */
968 for (nend = name; *nend || nend != (origname + len); nend++) {
973 else if (*nend == ':' && *(nend + 1) == ':') {
979 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
980 /* ->SUPER::method should really be looked up in original stash */
981 stash = CopSTASH(PL_curcop);
983 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
984 origname, HvENAME_get(stash), name) );
986 else if ((nsplit - origname) >= 7 &&
987 strnEQ(nsplit - 7, "::SUPER", 7)) {
988 /* don't autovifify if ->NoSuchStash::SUPER::method */
989 stash = gv_stashpvn(origname, nsplit - origname - 7, is_utf8);
990 if (stash) flags |= GV_SUPER;
993 /* don't autovifify if ->NoSuchStash::method */
994 stash = gv_stashpvn(origname, nsplit - origname, is_utf8);
999 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
1001 if (strEQ(name,"import") || strEQ(name,"unimport"))
1002 gv = MUTABLE_GV(&PL_sv_yes);
1004 gv = gv_autoload_pvn(
1005 ostash, name, nend - name, GV_AUTOLOAD_ISMETHOD|flags
1007 if (!gv && do_croak) {
1008 /* Right now this is exclusively for the benefit of S_method_common
1011 /* If we can't find an IO::File method, it might be a call on
1012 * a filehandle. If IO:File has not been loaded, try to
1013 * require it first instead of croaking */
1014 const char *stash_name = HvNAME_get(stash);
1015 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1016 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1017 STR_WITH_LEN("IO/File.pm"), 0,
1018 HV_FETCH_ISEXISTS, NULL, 0)
1020 require_pv("IO/File.pm");
1021 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
1026 "Can't locate object method \"%"UTF8f
1027 "\" via package \"%"HEKf"\"",
1028 UTF8fARG(is_utf8, nend - name, name),
1029 HEKfARG(HvNAME_HEK(stash)));
1035 packnamesv = newSVpvn_flags(origname, nsplit - origname,
1036 SVs_TEMP | is_utf8);
1038 packnamesv = error_report;
1042 "Can't locate object method \"%"UTF8f
1043 "\" via package \"%"SVf"\""
1044 " (perhaps you forgot to load \"%"SVf"\"?)",
1045 UTF8fARG(is_utf8, nend - name, name),
1046 SVfARG(packnamesv), SVfARG(packnamesv));
1050 else if (autoload) {
1051 CV* const cv = GvCV(gv);
1052 if (!CvROOT(cv) && !CvXSUB(cv)) {
1056 if (CvANON(cv) || !CvGV(cv))
1060 if (GvCV(stubgv) != cv) /* orphaned import */
1063 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1064 GvNAME(stubgv), GvNAMELEN(stubgv),
1065 GV_AUTOLOAD_ISMETHOD
1066 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
1076 Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
1080 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
1081 namepv = SvPV(namesv, namelen);
1084 return gv_autoload_pvn(stash, namepv, namelen, flags);
1088 Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
1090 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
1091 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
1095 Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
1102 SV *packname = NULL;
1103 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
1105 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
1107 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
1110 if (SvTYPE(stash) < SVt_PVHV) {
1111 STRLEN packname_len = 0;
1112 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1113 packname = newSVpvn_flags(packname_ptr, packname_len,
1114 SVs_TEMP | SvUTF8(stash));
1118 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
1119 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
1121 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE,
1122 is_utf8 | (flags & GV_SUPER))))
1126 if (!(CvROOT(cv) || CvXSUB(cv)))
1130 * Inheriting AUTOLOAD for non-methods works ... for now.
1133 !(flags & GV_AUTOLOAD_ISMETHOD)
1134 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
1136 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
1137 "Use of inherited AUTOLOAD for non-method %"SVf
1138 "::%"UTF8f"() is deprecated",
1140 UTF8fARG(is_utf8, len, name));
1143 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1144 * and split that value on the last '::', pass along the same data
1145 * via the SvPVX field in the CV, and the stash in CvSTASH.
1147 * Due to an unfortunate accident of history, the SvPVX field
1148 * serves two purposes. It is also used for the subroutine's pro-
1149 * type. Since SvPVX has been documented as returning the sub name
1150 * for a long time, but not as returning the prototype, we have
1151 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1154 * We put the prototype in the same allocated buffer, but after
1155 * the sub name. The SvPOK flag indicates the presence of a proto-
1156 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1157 * If both flags are on, then SvLEN is used to indicate the end of
1158 * the prototype (artificially lower than what is actually allo-
1159 * cated), at the risk of having to reallocate a few bytes unneces-
1160 * sarily--but that should happen very rarely, if ever.
1162 * We use SvUTF8 for both prototypes and sub names, so if one is
1163 * UTF8, the other must be upgraded.
1165 CvSTASH_set(cv, stash);
1166 if (SvPOK(cv)) { /* Ouch! */
1167 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
1169 const char *proto = CvPROTO(cv);
1172 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1173 ulen = SvCUR(tmpsv);
1174 SvCUR(tmpsv)++; /* include null in string */
1176 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1178 SvTEMP_on(tmpsv); /* Allow theft */
1179 sv_setsv_nomg((SV *)cv, tmpsv);
1181 SvREFCNT_dec_NN(tmpsv);
1182 SvLEN(cv) = SvCUR(cv) + 1;
1186 sv_setpvn((SV *)cv, name, len);
1190 else SvUTF8_off(cv);
1196 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1197 * The subroutine's original name may not be "AUTOLOAD", so we don't
1198 * use that, but for lack of anything better we will use the sub's
1199 * original package to look up $AUTOLOAD.
1201 varstash = GvSTASH(CvGV(cv));
1202 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
1206 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
1207 #ifdef PERL_DONT_CREATE_GVSV
1208 GvSV(vargv) = newSV(0);
1212 varsv = GvSVn(vargv);
1213 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1214 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
1215 sv_setsv(varsv, packname);
1216 sv_catpvs(varsv, "::");
1217 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1218 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
1221 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
1229 /* require_tie_mod() internal routine for requiring a module
1230 * that implements the logic of automatic ties like %! and %-
1232 * The "gv" parameter should be the glob.
1233 * "varpv" holds the name of the var, used for error messages.
1234 * "namesv" holds the module name. Its refcount will be decremented.
1235 * "methpv" holds the method name to test for to check that things
1236 * are working reasonably close to as expected.
1237 * "flags": if flag & 1 then save the scalar before loading.
1238 * For the protection of $! to work (it is set by this routine)
1239 * the sv slot must already be magicalized.
1242 S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
1244 HV* stash = gv_stashsv(namesv, 0);
1246 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1248 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
1249 SV *module = newSVsv(namesv);
1250 char varname = *varpv; /* varpv might be clobbered by load_module,
1251 so save it. For the moment it's always
1253 const char type = varname == '[' ? '$' : '%';
1261 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
1262 assert(sp == PL_stack_sp);
1263 stash = gv_stashsv(namesv, 0);
1265 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1266 type, varname, SVfARG(namesv));
1267 else if (!gv_fetchmethod(stash, methpv))
1268 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1269 type, varname, SVfARG(namesv), methpv);
1272 else SvREFCNT_dec_NN(namesv);
1277 =for apidoc gv_stashpv
1279 Returns a pointer to the stash for a specified package. Uses C<strlen> to
1280 determine the length of C<name>, then calls C<gv_stashpvn()>.
1286 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
1288 PERL_ARGS_ASSERT_GV_STASHPV;
1289 return gv_stashpvn(name, strlen(name), create);
1293 =for apidoc gv_stashpvn
1295 Returns a pointer to the stash for a specified package. The C<namelen>
1296 parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1297 to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1298 created if it does not already exist. If the package does not exist and
1299 C<flags> is 0 (or any other setting that does not create packages) then NULL
1302 Flags may be one of:
1311 The most important of which are probably GV_ADD and SVf_UTF8.
1317 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
1323 U32 tmplen = namelen + 2;
1325 PERL_ARGS_ASSERT_GV_STASHPVN;
1327 if (tmplen <= sizeof smallbuf)
1330 Newx(tmpbuf, tmplen, char);
1331 Copy(name, tmpbuf, namelen, char);
1332 tmpbuf[namelen] = ':';
1333 tmpbuf[namelen+1] = ':';
1334 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
1335 if (tmpbuf != smallbuf)
1339 stash = GvHV(tmpgv);
1340 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
1342 if (!HvNAME_get(stash)) {
1343 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1345 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1346 /* If the containing stash has multiple effective
1347 names, see that this one gets them, too. */
1348 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1349 mro_package_moved(stash, NULL, tmpgv, 1);
1355 =for apidoc gv_stashsv
1357 Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
1363 Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
1366 const char * const ptr = SvPV_const(sv,len);
1368 PERL_ARGS_ASSERT_GV_STASHSV;
1370 return gv_stashpvn(ptr, len, flags | SvUTF8(sv));
1375 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
1376 PERL_ARGS_ASSERT_GV_FETCHPV;
1377 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
1381 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
1383 const char * const nambeg =
1384 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
1385 PERL_ARGS_ASSERT_GV_FETCHSV;
1386 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1389 PERL_STATIC_INLINE void
1390 S_gv_magicalize_isa(pTHX_ GV *gv)
1394 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1398 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1402 /* This function grabs name and tries to split a stash and glob
1403 * from its contents. TODO better description, comments
1405 * If the function returns TRUE and 'name == name_end', then
1406 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1408 PERL_STATIC_INLINE bool
1409 S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1410 STRLEN *len, const char *nambeg, STRLEN full_len,
1411 const U32 is_utf8, const I32 add)
1413 const char *name_cursor;
1414 const char *const name_end = nambeg + full_len;
1415 const char *const name_em1 = name_end - 1;
1417 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1419 if (full_len > 2 && **name == '*' && isIDFIRST_lazy_if(*name + 1, is_utf8)) {
1420 /* accidental stringify on a GV? */
1424 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1425 if (name_cursor < name_em1 &&
1426 ((*name_cursor == ':' && name_cursor[1] == ':')
1427 || *name_cursor == '\''))
1430 *stash = PL_defstash;
1431 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1434 *len = name_cursor - *name;
1435 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1438 if (*name_cursor == ':') {
1444 Newx(tmpbuf, *len+2, char);
1445 Copy(*name, tmpbuf, *len, char);
1446 tmpbuf[(*len)++] = ':';
1447 tmpbuf[(*len)++] = ':';
1450 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add);
1451 *gv = gvp ? *gvp : NULL;
1452 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1453 if (SvTYPE(*gv) != SVt_PVGV)
1454 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1460 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1463 if (!(*stash = GvHV(*gv))) {
1464 *stash = GvHV(*gv) = newHV();
1465 if (!HvNAME_get(*stash)) {
1466 if (GvSTASH(*gv) == PL_defstash && *len == 6
1467 && strnEQ(*name, "CORE", 4))
1468 hv_name_set(*stash, "CORE", 4, 0);
1471 *stash, nambeg, name_cursor-nambeg, is_utf8
1473 /* If the containing stash has multiple effective
1474 names, see that this one gets them, too. */
1475 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1476 mro_package_moved(*stash, NULL, *gv, 1);
1479 else if (!HvNAME_get(*stash))
1480 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1483 if (*name_cursor == ':')
1485 *name = name_cursor+1;
1486 if (*name == name_end) {
1488 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1493 *len = name_cursor - *name;
1497 /* Checks if an unqualified name is in the main stash */
1498 PERL_STATIC_INLINE bool
1499 S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
1501 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
1503 /* If it's an alphanumeric variable */
1504 if ( len && isIDFIRST_lazy_if(name, is_utf8) ) {
1505 /* Some "normal" variables are always in main::,
1506 * like INC or STDOUT.
1514 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1515 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1516 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
1520 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1525 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1526 && name[3] == 'I' && name[4] == 'N')
1530 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1531 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1532 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
1536 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1537 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1543 /* *{""}, or a special variable like $@ */
1551 /* This function is called if parse_gv_stash_name() failed to
1552 * find a stash, or if GV_NOTQUAL or an empty name was passed
1553 * to gv_fetchpvn_flags.
1555 * It returns FALSE if the default stash can't be found nor created,
1556 * which might happen during global destruction.
1558 PERL_STATIC_INLINE bool
1559 S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1560 const U32 is_utf8, const I32 add,
1561 const svtype sv_type)
1563 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1565 /* No stash in name, so see how we can default */
1567 if ( gv_is_in_main(name, len, is_utf8) ) {
1568 *stash = PL_defstash;
1571 if (IN_PERL_COMPILETIME) {
1572 *stash = PL_curstash;
1573 if (add && (PL_hints & HINT_STRICT_VARS) &&
1574 sv_type != SVt_PVCV &&
1575 sv_type != SVt_PVGV &&
1576 sv_type != SVt_PVFM &&
1577 sv_type != SVt_PVIO &&
1578 !(len == 1 && sv_type == SVt_PV &&
1579 (*name == 'a' || *name == 'b')) )
1581 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0);
1582 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1583 SvTYPE(*gvp) != SVt_PVGV)
1587 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1588 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1589 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1591 /* diag_listed_as: Variable "%s" is not imported%s */
1593 aTHX_ packWARN(WARN_MISC),
1594 "Variable \"%c%"UTF8f"\" is not imported",
1595 sv_type == SVt_PVAV ? '@' :
1596 sv_type == SVt_PVHV ? '%' : '$',
1597 UTF8fARG(is_utf8, len, name));
1600 aTHX_ packWARN(WARN_MISC),
1601 "\t(Did you mean &%"UTF8f" instead?)\n",
1602 UTF8fARG(is_utf8, len, name)
1609 /* Use the current op's stash */
1610 *stash = CopSTASH(PL_curcop);
1615 if (add && !PL_in_clean_all) {
1616 SV * const err = Perl_mess(aTHX_
1617 "Global symbol \"%s%"UTF8f
1618 "\" requires explicit package name",
1619 (sv_type == SVt_PV ? "$"
1620 : sv_type == SVt_PVAV ? "@"
1621 : sv_type == SVt_PVHV ? "%"
1622 : ""), UTF8fARG(is_utf8, len, name));
1627 /* To maintain the output of errors after the strict exception
1628 * above, and to keep compat with older releases, rather than
1629 * placing the variables in the pad, we place
1630 * them in the <none>:: stash.
1632 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1634 /* symbol table under destruction */
1643 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1649 /* gv_magicalize() is called by gv_fetchpvn_flags when creating
1651 * Note that it does not insert the GV into the stash prior to
1652 * magicalization, which some variables require need in order
1653 * to work (like $[, %+, %-, %!), so callers must take care of
1656 * The return value has a specific meaning for gv_fetchpvn_flags:
1657 * If it returns true, and the gv is empty, it indicates that its
1658 * refcount should be decreased.
1660 PERL_STATIC_INLINE bool
1661 S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
1662 bool addmg, const svtype sv_type)
1666 PERL_ARGS_ASSERT_GV_MAGICALIZE;
1668 if (stash != PL_defstash) { /* not the main stash */
1669 /* We only have to check for a few names here: a, b, EXPORT, ISA
1670 and VERSION. All the others apply only to the main stash or to
1671 CORE (which is checked right after this). */
1673 const char * const name2 = name + 1;
1676 if (strnEQ(name2, "XPORT", 5))
1680 if (strEQ(name2, "SA"))
1681 gv_magicalize_isa(gv);
1684 if (strEQ(name2, "ERSION"))
1689 if (len == 1 && sv_type == SVt_PV)
1698 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1699 /* Avoid null warning: */
1700 const char * const stashname = HvNAME(stash); assert(stashname);
1701 if (strnEQ(stashname, "CORE", 4))
1702 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
1709 /* Nothing else to do.
1710 The compiler will probably turn the switch statement into a
1711 branch table. Make sure we avoid even that small overhead for
1712 the common case of lower case variable names. (On EBCDIC
1713 platforms, we can't just do:
1714 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1715 because cases like '\027' in the switch statement below are
1716 C1 (non-ASCII) controls on those platforms, so the remapping
1717 would make them larger than 'V')
1722 const char * const name2 = name + 1;
1725 if (strEQ(name2, "RGV")) {
1726 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1728 else if (strEQ(name2, "RGVOUT")) {
1733 if (strnEQ(name2, "XPORT", 5))
1737 if (strEQ(name2, "SA")) {
1738 gv_magicalize_isa(gv);
1742 if (strEQ(name2, "IG")) {
1745 if (!PL_psig_name) {
1746 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
1747 Newxz(PL_psig_pend, SIG_SIZE, int);
1748 PL_psig_ptr = PL_psig_name + SIG_SIZE;
1750 /* I think that the only way to get here is to re-use an
1751 embedded perl interpreter, where the previous
1752 use didn't clean up fully because
1753 PL_perl_destruct_level was 0. I'm not sure that we
1754 "support" that, in that I suspect in that scenario
1755 there are sufficient other garbage values left in the
1756 interpreter structure that something else will crash
1757 before we get here. I suspect that this is one of
1758 those "doctor, it hurts when I do this" bugs. */
1759 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
1760 Zero(PL_psig_pend, SIG_SIZE, int);
1764 hv_magic(hv, NULL, PERL_MAGIC_sig);
1765 for (i = 1; i < SIG_SIZE; i++) {
1766 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1768 sv_setsv(*init, &PL_sv_undef);
1773 if (strEQ(name2, "ERSION"))
1776 case '\003': /* $^CHILD_ERROR_NATIVE */
1777 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1780 case '\005': /* $^ENCODING */
1781 if (strEQ(name2, "NCODING"))
1784 case '\007': /* $^GLOBAL_PHASE */
1785 if (strEQ(name2, "LOBAL_PHASE"))
1788 case '\014': /* $^LAST_FH */
1789 if (strEQ(name2, "AST_FH"))
1792 case '\015': /* $^MATCH */
1793 if (strEQ(name2, "ATCH")) {
1794 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1798 case '\017': /* $^OPEN */
1799 if (strEQ(name2, "PEN"))
1802 case '\020': /* $^PREMATCH $^POSTMATCH */
1803 if (strEQ(name2, "REMATCH")) {
1804 paren = RX_BUFF_IDX_CARET_PREMATCH;
1807 if (strEQ(name2, "OSTMATCH")) {
1808 paren = RX_BUFF_IDX_CARET_POSTMATCH;
1812 case '\024': /* ${^TAINT} */
1813 if (strEQ(name2, "AINT"))
1816 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1817 if (strEQ(name2, "NICODE"))
1819 if (strEQ(name2, "TF8LOCALE"))
1821 if (strEQ(name2, "TF8CACHE"))
1824 case '\027': /* $^WARNING_BITS */
1825 if (strEQ(name2, "ARNING_BITS"))
1838 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1840 /* This snippet is taken from is_gv_magical */
1841 const char *end = name + len;
1842 while (--end > name) {
1846 paren = grok_atou(name, NULL);
1852 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1853 be case '\0' in this switch statement (ie a default case) */
1856 paren = RX_BUFF_IDX_FULLMATCH;
1859 paren = RX_BUFF_IDX_PREMATCH;
1862 paren = RX_BUFF_IDX_POSTMATCH;
1864 #ifdef PERL_SAWAMPERSAND
1866 sv_type == SVt_PVAV ||
1867 sv_type == SVt_PVHV ||
1868 sv_type == SVt_PVCV ||
1869 sv_type == SVt_PVFM ||
1871 )) { PL_sawampersand |=
1875 ? SAWAMPERSAND_MIDDLE
1876 : SAWAMPERSAND_RIGHT;
1889 paren = *name - '0';
1892 /* Flag the capture variables with a NULL mg_ptr
1893 Use mg_len for the array index to lookup. */
1894 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
1898 sv_setpv(GvSVn(gv),PL_chopset);
1902 #ifdef COMPLEX_STATUS
1903 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1909 /* If %! has been used, automatically load Errno.pm. */
1911 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1913 /* magicalization must be done before require_tie_mod is called */
1914 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1916 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1923 GvMULTI_on(gv); /* no used once warnings here */
1925 AV* const av = GvAVn(gv);
1926 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
1928 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
1929 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1931 SvREADONLY_on(GvSVn(gv));
1934 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1936 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
1944 if (sv_type == SVt_PV)
1945 /* diag_listed_as: $* is no longer supported */
1946 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1947 "$%c is no longer supported", *name);
1949 case '\010': /* $^H */
1951 HV *const hv = GvHVn(gv);
1952 hv_magic(hv, NULL, PERL_MAGIC_hints);
1956 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
1957 && FEATURE_ARYBASE_IS_ENABLED) {
1958 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
1961 else goto magicalize;
1963 case '\023': /* $^S */
1965 SvREADONLY_on(GvSVn(gv));
1981 case '\001': /* $^A */
1982 case '\003': /* $^C */
1983 case '\004': /* $^D */
1984 case '\005': /* $^E */
1985 case '\006': /* $^F */
1986 case '\011': /* $^I, NOT \t in EBCDIC */
1987 case '\016': /* $^N */
1988 case '\017': /* $^O */
1989 case '\020': /* $^P */
1990 case '\024': /* $^T */
1991 case '\027': /* $^W */
1993 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1996 case '\014': /* $^L */
1997 sv_setpvs(GvSVn(gv),"\f");
2000 sv_setpvs(GvSVn(gv),"\034");
2004 SV * const sv = GvSV(gv);
2005 if (!sv_derived_from(PL_patchlevel, "version"))
2006 upg_version(PL_patchlevel, TRUE);
2007 GvSV(gv) = vnumify(PL_patchlevel);
2008 SvREADONLY_on(GvSV(gv));
2012 case '\026': /* $^V */
2014 SV * const sv = GvSV(gv);
2015 GvSV(gv) = new_version(PL_patchlevel);
2016 SvREADONLY_on(GvSV(gv));
2022 if (sv_type == SVt_PV)
2030 /* This function is called when the stash already holds the GV of the magic
2031 * variable we're looking for, but we need to check that it has the correct
2032 * kind of magic. For example, if someone first uses $! and then %!, the
2033 * latter would end up here, and we add the Errno tie to the HASH slot of
2036 PERL_STATIC_INLINE void
2037 S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2039 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2041 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2043 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
2044 else if (*name == '-' || *name == '+')
2045 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
2046 } else if (sv_type == SVt_PV) {
2047 if (*name == '*' || *name == '#') {
2048 /* diag_listed_as: $* is no longer supported */
2049 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2051 "$%c is no longer supported", *name);
2054 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2057 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
2059 #ifdef PERL_SAWAMPERSAND
2061 PL_sawampersand |= SAWAMPERSAND_LEFT;
2065 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2069 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2078 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2079 const svtype sv_type)
2081 const char *name = nambeg;
2086 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2087 const I32 no_expand = flags & GV_NOEXPAND;
2088 const I32 add = flags & ~GV_NOADD_MASK;
2089 const U32 is_utf8 = flags & SVf_UTF8;
2090 bool addmg = cBOOL(flags & GV_ADDMG);
2091 const char *const name_end = nambeg + full_len;
2094 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2096 /* If we have GV_NOTQUAL, the caller promised that
2097 * there is no stash, so we can skip the check.
2098 * Similarly if full_len is 0, since then we're
2099 * dealing with something like *{""} or ""->foo()
2101 if ((flags & GV_NOTQUAL) || !full_len) {
2104 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2105 if (name == name_end) return gv;
2111 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2115 /* By this point we should have a stash and a name */
2116 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
2117 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2118 if (addmg) gv = (GV *)newSV(0);
2121 else gv = *gvp, addmg = 0;
2122 /* From this point on, addmg means gv has not been inserted in the
2125 if (SvTYPE(gv) == SVt_PVGV) {
2126 /* The GV already exists, so return it, but check if we need to do
2127 * anything else with it before that.
2130 /* This is the heuristic that handles if a variable triggers the
2131 * 'used only once' warning. If there's already a GV in the stash
2132 * with this name, then we assume that the variable has been used
2133 * before and turn its MULTI flag on.
2134 * It's a heuristic because it can easily be "tricked", like with
2135 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2136 * not warning about $main::foo being used just once
2139 gv_init_svtype(gv, sv_type);
2140 /* You reach this path once the typeglob has already been created,
2141 either by the same or a different sigil. If this path didn't
2142 exist, then (say) referencing $! first, and %! second would
2143 mean that %! was not handled correctly. */
2144 if (len == 1 && stash == PL_defstash) {
2145 maybe_multimagic_gv(gv, name, sv_type);
2147 else if (len == 3 && sv_type == SVt_PVAV
2148 && strnEQ(name, "ISA", 3)
2149 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2150 gv_magicalize_isa(gv);
2153 } else if (no_init) {
2157 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2158 * don't expand it to a glob. This is an optimization so that things
2159 * copying constants over, like Exporter, don't have to be rewritten
2160 * to take into account that you can store more than just globs in
2163 else if (no_expand && SvROK(gv)) {
2168 /* Adding a new symbol.
2169 Unless of course there was already something non-GV here, in which case
2170 we want to behave as if there was always a GV here, containing some sort
2172 Otherwise we run the risk of creating things like GvIO, which can cause
2173 subtle bugs. eg the one that tripped up SQL::Translator */
2175 faking_it = SvOK(gv);
2177 if (add & GV_ADDWARN)
2178 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2179 "Had to create %"UTF8f" unexpectedly",
2180 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2181 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2183 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
2186 /* First, store the gv in the symtab if we're adding magic,
2187 * but only for non-empty GVs
2189 #define GvEMPTY(gv) !(GvAV(gv) || GvHV(gv) || GvIO(gv) \
2190 || GvCV(gv) || (GvSV(gv) && SvOK(GvSV(gv))))
2192 if ( addmg && !GvEMPTY(gv) ) {
2193 (void)hv_store(stash,name,len,(SV *)gv,0);
2196 /* set up magic where warranted */
2197 if ( gv_magicalize(gv, stash, name, len, addmg, sv_type) ) {
2200 if ( GvSV(gv) && SvMAGICAL(GvSV(gv)) ) {
2201 /* The GV was and still is "empty", except that now
2202 * it has the magic flags turned on, so we want it
2203 * stored in the symtab.
2205 (void)hv_store(stash,name,len,(SV *)gv,0);
2208 /* Most likely the temporary GV created above */
2209 SvREFCNT_dec_NN(gv);
2215 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
2220 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
2223 const HV * const hv = GvSTASH(gv);
2225 PERL_ARGS_ASSERT_GV_FULLNAME4;
2227 sv_setpv(sv, prefix ? prefix : "");
2229 if (hv && (name = HvNAME(hv))) {
2230 const STRLEN len = HvNAMELEN(hv);
2231 if (keepmain || strnNE(name, "main", len)) {
2232 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
2236 else sv_catpvs(sv,"__ANON__::");
2237 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
2241 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
2243 const GV * const egv = GvEGVx(gv);
2245 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2247 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
2251 /* recursively scan a stash and any nested stashes looking for entries
2252 * that need the "only used once" warning raised
2256 Perl_gv_check(pTHX_ HV *stash)
2260 PERL_ARGS_ASSERT_GV_CHECK;
2262 if (!HvARRAY(stash))
2265 assert(SvOOK(stash));
2267 for (i = 0; i <= (I32) HvMAX(stash); i++) {
2269 /* mark stash is being scanned, to avoid recursing */
2270 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
2271 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
2274 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
2275 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
2277 if (hv != PL_defstash && hv != stash
2279 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2281 gv_check(hv); /* nested package */
2283 else if ( *HeKEY(entry) != '_'
2284 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
2286 gv = MUTABLE_GV(HeVAL(entry));
2287 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
2290 CopLINE_set(PL_curcop, GvLINE(gv));
2292 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2294 CopFILEGV(PL_curcop)
2295 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2297 Perl_warner(aTHX_ packWARN(WARN_ONCE),
2298 "Name \"%"HEKf"::%"HEKf
2299 "\" used only once: possible typo",
2300 HEKfARG(HvNAME_HEK(stash)),
2301 HEKfARG(GvNAME_HEK(gv)));
2304 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
2309 Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
2311 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
2312 assert(!(flags & ~SVf_UTF8));
2314 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2315 UTF8fARG(flags, strlen(pack), pack),
2320 /* hopefully this is only called on local symbol table entries */
2323 Perl_gp_ref(pTHX_ GP *gp)
2330 /* If the GP they asked for a reference to contains
2331 a method cache entry, clear it first, so that we
2332 don't infect them with our cached entry */
2333 SvREFCNT_dec_NN(gp->gp_cv);
2342 Perl_gp_free(pTHX_ GV *gv)
2347 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
2349 if (gp->gp_refcnt == 0) {
2350 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2351 "Attempt to free unreferenced glob pointers"
2352 pTHX__FORMAT pTHX__VALUE);
2355 if (gp->gp_refcnt > 1) {
2357 if (gp->gp_egv == gv)
2365 /* Copy and null out all the glob slots, so destructors do not see
2367 HEK * const file_hek = gp->gp_file_hek;
2368 SV * const sv = gp->gp_sv;
2369 AV * const av = gp->gp_av;
2370 HV * const hv = gp->gp_hv;
2371 IO * const io = gp->gp_io;
2372 CV * const cv = gp->gp_cv;
2373 CV * const form = gp->gp_form;
2375 gp->gp_file_hek = NULL;
2384 unshare_hek(file_hek);
2388 /* FIXME - another reference loop GV -> symtab -> GV ?
2389 Somehow gp->gp_hv can end up pointing at freed garbage. */
2390 if (hv && SvTYPE(hv) == SVt_PVHV) {
2391 const HEK *hvname_hek = HvNAME_HEK(hv);
2392 DEBUG_o(Perl_deb(aTHX_ "gp_free clearing PL_stashcache for '%"HEKf"'\n", HEKfARG(hvname_hek)));
2393 if (PL_stashcache && hvname_hek)
2394 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
2401 /* Possibly reallocated by a destructor */
2404 if (!gp->gp_file_hek
2410 && !gp->gp_form) break;
2412 if (--attempts == 0) {
2414 "panic: gp_free failed to free glob pointer - "
2415 "something is repeatedly re-creating entries"
2420 /* Possibly incremented by a destructor doing glob assignment */
2421 if (gp->gp_refcnt > 1) goto borrowed;
2427 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2429 AMT * const amtp = (AMT*)mg->mg_ptr;
2430 PERL_UNUSED_ARG(sv);
2432 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2434 if (amtp && AMT_AMAGIC(amtp)) {
2436 for (i = 1; i < NofAMmeth; i++) {
2437 CV * const cv = amtp->table[i];
2439 SvREFCNT_dec_NN(MUTABLE_SV(cv));
2440 amtp->table[i] = NULL;
2447 /* Updates and caches the CV's */
2449 * 1 on success and there is some overload
2450 * 0 if there is no overload
2451 * -1 if some error occurred and it couldn't croak
2455 Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
2457 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
2459 const struct mro_meta* stash_meta = HvMROMETA(stash);
2462 PERL_ARGS_ASSERT_GV_AMUPDATE;
2464 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
2466 const AMT * const amtp = (AMT*)mg->mg_ptr;
2467 if (amtp->was_ok_sub == newgen) {
2468 return AMT_AMAGIC(amtp) ? 1 : 0;
2470 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
2473 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
2476 amt.was_ok_sub = newgen;
2477 amt.fallback = AMGfallNO;
2483 bool deref_seen = 0;
2486 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
2488 /* Try to find via inheritance. */
2489 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
2490 SV * const sv = gv ? GvSV(gv) : NULL;
2495 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
2498 #ifdef PERL_DONT_CREATE_GVSV
2500 NOOP; /* Equivalent to !SvTRUE and !SvOK */
2503 else if (SvTRUE(sv))
2504 /* don't need to set overloading here because fallback => 1
2505 * is the default setting for classes without overloading */
2506 amt.fallback=AMGfallYES;
2507 else if (SvOK(sv)) {
2508 amt.fallback=AMGfallNEVER;
2515 assert(SvOOK(stash));
2516 /* initially assume the worst */
2517 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
2519 for (i = 1; i < NofAMmeth; i++) {
2520 const char * const cooky = PL_AMG_names[i];
2521 /* Human-readable form, for debugging: */
2522 const char * const cp = AMG_id2name(i);
2523 const STRLEN l = PL_AMG_namelens[i];
2525 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
2526 cp, HvNAME_get(stash)) );
2527 /* don't fill the cache while looking up!
2528 Creation of inheritance stubs in intermediate packages may
2529 conflict with the logic of runtime method substitution.
2530 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2531 then we could have created stubs for "(+0" in A and C too.
2532 But if B overloads "bool", we may want to use it for
2533 numifying instead of C's "+0". */
2534 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
2536 if (gv && (cv = GvCV(gv))) {
2537 if(GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")){
2538 const char * const hvname = HvNAME_get(GvSTASH(CvGV(cv)));
2539 if (hvname && HEK_LEN(HvNAME_HEK(GvSTASH(CvGV(cv)))) == 8
2540 && strEQ(hvname, "overload")) {
2541 /* This is a hack to support autoloading..., while
2542 knowing *which* methods were declared as overloaded. */
2543 /* GvSV contains the name of the method. */
2545 SV *gvsv = GvSV(gv);
2547 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2548 "\" for overloaded \"%s\" in package \"%.256s\"\n",
2549 (void*)GvSV(gv), cp, HvNAME(stash)) );
2550 if (!gvsv || !SvPOK(gvsv)
2551 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
2553 /* Can be an import stub (created by "can"). */
2558 const SV * const name = (gvsv && SvPOK(gvsv))
2560 : newSVpvs_flags("???", SVs_TEMP);
2561 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
2562 Perl_croak(aTHX_ "%s method \"%"SVf256
2563 "\" overloading \"%s\" "\
2564 "in package \"%"HEKf256"\"",
2565 (GvCVGEN(gv) ? "Stub found while resolving"
2573 cv = GvCV(gv = ngv);
2576 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
2577 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
2578 GvNAME(CvGV(cv))) );
2580 } else if (gv) { /* Autoloaded... */
2581 cv = MUTABLE_CV(gv);
2584 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
2600 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2601 * NB - aux var invalid here, HvARRAY() could have been
2602 * reallocated since it was assigned to */
2603 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
2606 AMT_AMAGIC_on(&amt);
2607 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
2608 (char*)&amt, sizeof(AMT));
2612 /* Here we have no table: */
2614 AMT_AMAGIC_off(&amt);
2615 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
2616 (char*)&amt, sizeof(AMTS));
2622 Perl_gv_handler(pTHX_ HV *stash, I32 id)
2627 struct mro_meta* stash_meta;
2629 if (!stash || !HvNAME_get(stash))
2632 stash_meta = HvMROMETA(stash);
2633 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
2635 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
2638 if (Gv_AMupdate(stash, 0) == -1)
2640 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
2643 amtp = (AMT*)mg->mg_ptr;
2644 if ( amtp->was_ok_sub != newgen )
2646 if (AMT_AMAGIC(amtp)) {
2647 CV * const ret = amtp->table[id];
2648 if (ret && isGV(ret)) { /* Autoloading stab */
2649 /* Passing it through may have resulted in a warning
2650 "Inherited AUTOLOAD for a non-method deprecated", since
2651 our caller is going through a function call, not a method call.
2652 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
2653 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
2665 /* Implement tryAMAGICun_MG macro.
2666 Do get magic, then see if the stack arg is overloaded and if so call it.
2668 AMGf_set return the arg using SETs rather than assigning to
2670 AMGf_numeric apply sv_2num to the stack arg.
2674 Perl_try_amagic_un(pTHX_ int method, int flags) {
2677 SV* const arg = TOPs;
2681 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2682 AMGf_noright | AMGf_unary))) {
2683 if (flags & AMGf_set) {
2688 if (SvPADMY(TARG)) {
2689 sv_setsv(TARG, tmpsv);
2699 if ((flags & AMGf_numeric) && SvROK(arg))
2705 /* Implement tryAMAGICbin_MG macro.
2706 Do get magic, then see if the two stack args are overloaded and if so
2709 AMGf_set return the arg using SETs rather than assigning to
2711 AMGf_assign op may be called as mutator (eg +=)
2712 AMGf_numeric apply sv_2num to the stack arg.
2716 Perl_try_amagic_bin(pTHX_ int method, int flags) {
2718 SV* const left = TOPm1s;
2719 SV* const right = TOPs;
2725 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2726 SV * const tmpsv = amagic_call(left, right, method,
2727 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2729 if (flags & AMGf_set) {
2736 if (opASSIGN || SvPADMY(TARG)) {
2737 sv_setsv(TARG, tmpsv);
2747 if(left==right && SvGMAGICAL(left)) {
2748 SV * const left = sv_newmortal();
2750 /* Print the uninitialized warning now, so it includes the vari-
2753 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2754 sv_setsv_flags(left, &PL_sv_no, 0);
2756 else sv_setsv_flags(left, right, 0);
2759 if (flags & AMGf_numeric) {
2761 *(sp-1) = sv_2num(TOPm1s);
2763 *sp = sv_2num(right);
2769 Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2773 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2777 /* return quickly if none of the deref ops are overloaded */
2778 stash = SvSTASH(SvRV(ref));
2779 assert(SvOOK(stash));
2780 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
2783 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
2784 AMGf_noright | AMGf_unary))) {
2786 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2787 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2788 /* Bail out if it returns us the same reference. */
2795 return tmpsv ? tmpsv : ref;
2799 Perl_amagic_is_enabled(pTHX_ int method)
2801 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2803 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2805 if ( !lex_mask || !SvOK(lex_mask) )
2806 /* overloading lexically disabled */
2808 else if ( lex_mask && SvPOK(lex_mask) ) {
2809 /* we have an entry in the hints hash, check if method has been
2810 * masked by overloading.pm */
2812 const int offset = method / 8;
2813 const int bit = method % 8;
2814 char *pv = SvPV(lex_mask, len);
2816 /* Bit set, so this overloading operator is disabled */
2817 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2824 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
2829 CV **cvp=NULL, **ocvp=NULL;
2830 AMT *amtp=NULL, *oamtp=NULL;
2831 int off = 0, off1, lr = 0, notfound = 0;
2832 int postpr = 0, force_cpy = 0;
2833 int assign = AMGf_assign & flags;
2834 const int assignshift = assign ? 1 : 0;
2835 int use_default_op = 0;
2836 int force_scalar = 0;
2842 PERL_ARGS_ASSERT_AMAGIC_CALL;
2844 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
2845 if (!amagic_is_enabled(method)) return NULL;
2848 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
2849 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
2850 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
2851 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
2852 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
2854 && ((cv = cvp[off=method+assignshift])
2855 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2861 cv = cvp[off=method])))) {
2862 lr = -1; /* Call method for left argument */
2864 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2867 /* look for substituted methods */
2868 /* In all the covered cases we should be called with assign==0. */
2872 if ((cv = cvp[off=add_ass_amg])
2873 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
2874 right = &PL_sv_yes; lr = -1; assign = 1;
2879 if ((cv = cvp[off = subtr_ass_amg])
2880 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
2881 right = &PL_sv_yes; lr = -1; assign = 1;
2885 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
2888 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
2891 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
2894 (void)((cv = cvp[off=bool__amg])
2895 || (cv = cvp[off=numer_amg])
2896 || (cv = cvp[off=string_amg]));
2903 * SV* ref causes confusion with the interpreter variable of
2906 SV* const tmpRef=SvRV(left);
2907 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
2909 * Just to be extra cautious. Maybe in some
2910 * additional cases sv_setsv is safe, too.
2912 SV* const newref = newSVsv(tmpRef);
2913 SvOBJECT_on(newref);
2914 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
2915 delegate to the stash. */
2916 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
2922 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
2923 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
2924 SV* const nullsv=sv_2mortal(newSViv(0));
2926 SV* const lessp = amagic_call(left,nullsv,
2927 lt_amg,AMGf_noright);
2928 logic = SvTRUE(lessp);
2930 SV* const lessp = amagic_call(left,nullsv,
2931 ncmp_amg,AMGf_noright);
2932 logic = (SvNV(lessp) < 0);
2935 if (off==subtr_amg) {
2946 if ((cv = cvp[off=subtr_amg])) {
2948 left = sv_2mortal(newSViv(0));
2953 case iter_amg: /* XXXX Eventually should do to_gv. */
2954 case ftest_amg: /* XXXX Eventually should do to_gv. */
2957 return NULL; /* Delegate operation to standard mechanisms. */
2965 return left; /* Delegate operation to standard mechanisms. */
2970 if (!cv) goto not_found;
2971 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
2972 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
2973 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
2974 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
2975 ? (amtp = (AMT*)mg->mg_ptr)->table
2977 && (cv = cvp[off=method])) { /* Method for right
2980 } else if (((cvp && amtp->fallback > AMGfallNEVER)
2981 || (ocvp && oamtp->fallback > AMGfallNEVER))
2982 && !(flags & AMGf_unary)) {
2983 /* We look for substitution for
2984 * comparison operations and
2986 if (method==concat_amg || method==concat_ass_amg
2987 || method==repeat_amg || method==repeat_ass_amg) {
2988 return NULL; /* Delegate operation to string conversion */
3010 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3014 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3024 not_found: /* No method found, either report or croak */
3032 return left; /* Delegate operation to standard mechanisms. */
3034 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3035 notfound = 1; lr = -1;
3036 } else if (cvp && (cv=cvp[nomethod_amg])) {
3037 notfound = 1; lr = 1;
3038 } else if ((use_default_op =
3039 (!ocvp || oamtp->fallback >= AMGfallYES)
3040 && (!cvp || amtp->fallback >= AMGfallYES))
3042 /* Skip generating the "no method found" message. */
3046 if (off==-1) off=method;
3047 msg = sv_2mortal(Perl_newSVpvf(aTHX_
3048 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
3049 AMG_id2name(method + assignshift),
3050 (flags & AMGf_unary ? " " : "\n\tleft "),
3052 "in overloaded package ":
3053 "has no overloaded magic",
3055 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3058 ",\n\tright argument in overloaded package ":
3061 : ",\n\tright argument has no overloaded magic"),
3063 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3064 SVfARG(&PL_sv_no)));
3065 if (use_default_op) {
3066 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
3068 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
3072 force_cpy = force_cpy || assign;
3077 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3078 * operation. we need this to return a value, so that it can be assigned
3079 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3080 * increment or decrement was itself called in void context */
3086 if (off == subtr_amg)
3089 /* in these cases, we're calling an assignment variant of an operator
3090 * (+= rather than +, for instance). regardless of whether it's a
3091 * fallback or not, it always has to return a value, which will be
3092 * assigned to the proper variable later */
3109 /* the copy constructor always needs to return a value */
3113 /* because of the way these are implemented (they don't perform the
3114 * dereferencing themselves, they return a reference that perl then
3115 * dereferences later), they always have to be in scalar context */
3123 /* these don't have an op of their own; they're triggered by their parent
3124 * op, so the context there isn't meaningful ('$a and foo()' in void
3125 * context still needs to pass scalar context on to $a's bool overload) */
3135 DEBUG_o(Perl_deb(aTHX_
3136 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
3138 method+assignshift==off? "" :
3140 method+assignshift==off? "" :
3141 AMG_id2name(method+assignshift),
3142 method+assignshift==off? "" : "\")",
3143 flags & AMGf_unary? "" :
3144 lr==1 ? " for right argument": " for left argument",
3145 flags & AMGf_unary? " for argument" : "",
3146 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
3147 fl? ",\n\tassignment variant used": "") );
3150 /* Since we use shallow copy during assignment, we need
3151 * to dublicate the contents, probably calling user-supplied
3152 * version of copy operator
3154 /* We need to copy in following cases:
3155 * a) Assignment form was called.
3156 * assignshift==1, assign==T, method + 1 == off
3157 * b) Increment or decrement, called directly.
3158 * assignshift==0, assign==0, method + 0 == off
3159 * c) Increment or decrement, translated to assignment add/subtr.
3160 * assignshift==0, assign==T,
3162 * d) Increment or decrement, translated to nomethod.
3163 * assignshift==0, assign==0,
3165 * e) Assignment form translated to nomethod.
3166 * assignshift==1, assign==T, method + 1 != off
3169 /* off is method, method+assignshift, or a result of opcode substitution.
3170 * In the latter case assignshift==0, so only notfound case is important.
3172 if ( (lr == -1) && ( ( (method + assignshift == off)
3173 && (assign || (method == inc_amg) || (method == dec_amg)))
3176 /* newSVsv does not behave as advertised, so we copy missing
3177 * information by hand */
3178 SV *tmpRef = SvRV(left);
3180 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
3181 SvRV_set(left, rv_copy);
3183 SvREFCNT_dec_NN(tmpRef);
3191 const bool oldcatch = CATCH_GET;
3193 int gimme = force_scalar ? G_SCALAR : GIMME_V;
3196 Zero(&myop, 1, BINOP);
3197 myop.op_last = (OP *) &myop;
3198 myop.op_next = NULL;
3199 myop.op_flags = OPf_STACKED;
3203 myop.op_flags |= OPf_WANT_VOID;
3206 if (flags & AMGf_want_list) {
3207 myop.op_flags |= OPf_WANT_LIST;
3212 myop.op_flags |= OPf_WANT_SCALAR;
3216 PUSHSTACKi(PERLSI_OVERLOAD);
3219 PL_op = (OP *) &myop;
3220 if (PERLDB_SUB && PL_curstash != PL_debstash)
3221 PL_op->op_private |= OPpENTERSUB_DB;
3222 Perl_pp_pushmark(aTHX);
3224 EXTEND(SP, notfound + 5);
3225 PUSHs(lr>0? right: left);
3226 PUSHs(lr>0? left: right);
3227 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
3229 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3230 AMG_id2namelen(method + assignshift), SVs_TEMP));
3232 PUSHs(MUTABLE_SV(cv));
3236 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
3240 nret = SP - (PL_stack_base + oldmark);
3244 /* returning NULL has another meaning, and we check the context
3245 * at the call site too, so this can be differentiated from the
3248 SP = PL_stack_base + oldmark;
3251 if (flags & AMGf_want_list) {
3252 res = sv_2mortal((SV *)newAV());
3253 av_extend((AV *)res, nret);
3255 av_store((AV *)res, nret, POPs);
3267 CATCH_SET(oldcatch);
3274 ans=SvIV(res)<=0; break;
3277 ans=SvIV(res)<0; break;
3280 ans=SvIV(res)>=0; break;
3283 ans=SvIV(res)>0; break;
3286 ans=SvIV(res)==0; break;
3289 ans=SvIV(res)!=0; break;
3292 SvSetSV(left,res); return left;
3294 ans=!SvTRUE(res); break;
3299 } else if (method==copy_amg) {
3301 Perl_croak(aTHX_ "Copy method did not return a reference");
3303 return SvREFCNT_inc(SvRV(res));
3311 Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3316 PERL_ARGS_ASSERT_GV_NAME_SET;
3319 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3321 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3322 unshare_hek(GvNAME_HEK(gv));
3325 PERL_HASH(hash, name, len);
3326 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
3330 =for apidoc gv_try_downgrade
3332 If the typeglob C<gv> can be expressed more succinctly, by having
3333 something other than a real GV in its place in the stash, replace it
3334 with the optimised form. Basic requirements for this are that C<gv>
3335 is a real typeglob, is sufficiently ordinary, and is only referenced
3336 from its package. This function is meant to be used when a GV has been
3337 looked up in part to see what was there, causing upgrading, but based
3338 on what was found it turns out that the real GV isn't required after all.
3340 If C<gv> is a completely empty typeglob, it is deleted from the stash.
3342 If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3343 sub, the typeglob is replaced with a scalar-reference placeholder that
3344 more compactly represents the same thing.
3350 Perl_gv_try_downgrade(pTHX_ GV *gv)
3356 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
3358 /* XXX Why and where does this leave dangling pointers during global
3360 if (PL_phase == PERL_PHASE_DESTRUCT) return;
3362 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
3363 !SvOBJECT(gv) && !SvREADONLY(gv) &&
3364 isGV_with_GP(gv) && GvGP(gv) &&
3365 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
3366 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
3367 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
3369 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3371 if (SvMAGICAL(gv)) {
3373 /* only backref magic is allowed */
3374 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3376 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3377 if (mg->mg_type != PERL_MAGIC_backref)
3383 HEK *gvnhek = GvNAME_HEK(gv);
3384 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
3385 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 &&
3386 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
3387 CvSTASH(cv) == stash && CvGV(cv) == gv &&
3388 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3389 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3390 (namehek = GvNAME_HEK(gv)) &&
3391 (gvp = hv_fetchhek(stash, namehek, 0)) &&
3393 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
3394 const bool imported = !!GvIMPORTED_CV(gv);
3398 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
3399 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3400 STRUCT_OFFSET(XPVIV, xiv_iv));
3401 SvRV_set(gv, value);
3406 Perl_gv_override(pTHX_ const char * const name, const STRLEN len)
3408 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV);
3410 PERL_ARGS_ASSERT_GV_OVERRIDE;
3411 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv;
3412 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE);
3413 gv = gvp ? *gvp : NULL;
3414 if (gv && !isGV(gv)) {
3415 if (!SvPCS_IMPORTED(gv)) return NULL;
3416 gv_init(gv, PL_globalstash, name, len, 0);
3419 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL;
3425 core_xsub(pTHX_ CV* cv)
3428 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3434 * c-indentation-style: bsd
3436 * indent-tabs-mode: nil
3439 * ex: set ts=8 sts=4 sw=4 et: