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 $foo, @foo, %foo.
29 GVs are usually found as values in stashes (symbol table hashes) where
30 Perl stores its global variables.
42 static const char S_autoload[] = "AUTOLOAD";
43 static const STRLEN S_autolen = sizeof(S_autoload)-1;
46 Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
53 SvTYPE((const SV *)gv) != SVt_PVGV
54 && SvTYPE((const SV *)gv) != SVt_PVLV
58 if (type == SVt_PVIO) {
60 * if it walks like a dirhandle, then let's assume that
61 * this is a dirhandle.
63 what = OP_IS_DIRHOP(PL_op->op_type) ?
64 "dirhandle" : "filehandle";
65 } else if (type == SVt_PVHV) {
68 what = type == SVt_PVAV ? "array" : "scalar";
70 /* diag_listed_as: Bad symbol for filehandle */
71 Perl_croak(aTHX_ "Bad symbol for %s", what);
74 if (type == SVt_PVHV) {
75 where = (SV **)&GvHV(gv);
76 } else if (type == SVt_PVAV) {
77 where = (SV **)&GvAV(gv);
78 } else if (type == SVt_PVIO) {
79 where = (SV **)&GvIOp(gv);
86 *where = newSV_type(type);
87 if (type == SVt_PVAV && GvNAMELEN(gv) == 3
88 && strnEQ(GvNAME(gv), "ISA", 3))
89 sv_magic(*where, (SV *)gv, PERL_MAGIC_isa, NULL, 0);
95 Perl_gv_fetchfile(pTHX_ const char *name)
97 PERL_ARGS_ASSERT_GV_FETCHFILE;
98 return gv_fetchfile_flags(name, strlen(name), 0);
102 Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
108 const STRLEN tmplen = namelen + 2;
111 PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS;
112 PERL_UNUSED_ARG(flags);
117 if (tmplen <= sizeof smallbuf)
120 Newx(tmpbuf, tmplen, char);
121 /* This is where the debugger's %{"::_<$filename"} hash is created */
124 memcpy(tmpbuf + 2, name, namelen);
125 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
127 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
128 #ifdef PERL_DONT_CREATE_GVSV
129 GvSV(gv) = newSVpvn(name, namelen);
131 sv_setpvn(GvSV(gv), name, namelen);
134 if ((PERLDB_LINE || PERLDB_SAVESRC) && !GvAV(gv))
135 hv_magic(GvHVn(gv), GvAVn(gv), PERL_MAGIC_dbfile);
136 if (tmpbuf != smallbuf)
142 =for apidoc gv_const_sv
144 If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
145 inlining, or C<gv> is a placeholder reference that would be promoted to such
146 a typeglob, then returns the value returned by the sub. Otherwise, returns
153 Perl_gv_const_sv(pTHX_ GV *gv)
155 PERL_ARGS_ASSERT_GV_CONST_SV;
157 if (SvTYPE(gv) == SVt_PVGV)
158 return cv_const_sv(GvCVu(gv));
159 return SvROK(gv) && SvTYPE(SvRV(gv)) != SVt_PVAV ? SvRV(gv) : NULL;
163 Perl_newGP(pTHX_ GV *const gv)
174 PERL_ARGS_ASSERT_NEWGP;
176 gp->gp_egv = gv; /* allow compiler to reuse gv after this */
177 #ifndef PERL_DONT_CREATE_GVSV
178 gp->gp_sv = newSV(0);
181 /* PL_curcop may be null here. E.g.,
182 INIT { bless {} and exit }
183 frees INIT before looking up DESTROY (and creating *DESTROY)
186 gp->gp_line = CopLINE(PL_curcop); /* 0 otherwise Newxz */
188 if (CopFILE(PL_curcop)) {
189 file = CopFILE(PL_curcop);
193 filegv = CopFILEGV(PL_curcop);
195 file = GvNAME(filegv)+2;
196 len = GvNAMELEN(filegv)-2;
207 PERL_HASH(hash, file, len);
208 gp->gp_file_hek = share_hek(file, len, hash);
214 /* Assign CvGV(cv) = gv, handling weak references.
215 * See also S_anonymise_cv_maybe */
218 Perl_cvgv_set(pTHX_ CV* cv, GV* gv)
220 GV * const oldgv = CvGV(cv);
222 PERL_ARGS_ASSERT_CVGV_SET;
229 SvREFCNT_dec_NN(oldgv);
233 sv_del_backref(MUTABLE_SV(oldgv), MUTABLE_SV(cv));
236 else if ((hek = CvNAME_HEK(cv))) unshare_hek(hek);
238 SvANY(cv)->xcv_gv_u.xcv_gv = gv;
239 assert(!CvCVGV_RC(cv));
244 if (isGV_with_GP(gv) && GvGP(gv) && (GvCV(gv) == cv || GvFORM(gv) == cv))
245 Perl_sv_add_backref(aTHX_ MUTABLE_SV(gv), MUTABLE_SV(cv));
248 SvREFCNT_inc_simple_void_NN(gv);
252 /* Assign CvSTASH(cv) = st, handling weak references. */
255 Perl_cvstash_set(pTHX_ CV *cv, HV *st)
257 HV *oldst = CvSTASH(cv);
258 PERL_ARGS_ASSERT_CVSTASH_SET;
262 sv_del_backref(MUTABLE_SV(oldst), MUTABLE_SV(cv));
263 SvANY(cv)->xcv_stash = st;
265 Perl_sv_add_backref(aTHX_ MUTABLE_SV(st), MUTABLE_SV(cv));
269 =for apidoc gv_init_pvn
271 Converts a scalar into a typeglob. This is an incoercible typeglob;
272 assigning a reference to it will assign to one of its slots, instead of
273 overwriting it as happens with typeglobs created by SvSetSV. Converting
274 any scalar that is SvOK() may produce unpredictable results and is reserved
275 for perl's internal use.
277 C<gv> is the scalar to be converted.
279 C<stash> is the parent stash/package, if any.
281 C<name> and C<len> give the name. The name must be unqualified;
282 that is, it must not include the package name. If C<gv> is a
283 stash element, it is the caller's responsibility to ensure that the name
284 passed to this function matches the name of the element. If it does not
285 match, perl's internal bookkeeping will get out of sync.
287 C<flags> can be set to SVf_UTF8 if C<name> is a UTF8 string, or
288 the return value of SvUTF8(sv). It can also take the
289 GV_ADDMULTI flag, which means to pretend that the GV has been
290 seen before (i.e., suppress "Used once" warnings).
294 The old form of gv_init_pvn(). It does not work with UTF8 strings, as it
295 has no flags parameter. If the C<multi> parameter is set, the
296 GV_ADDMULTI flag will be passed to gv_init_pvn().
298 =for apidoc gv_init_pv
300 Same as gv_init_pvn(), but takes a nul-terminated string for the name
301 instead of separate char * and length parameters.
303 =for apidoc gv_init_sv
305 Same as gv_init_pvn(), but takes an SV * for the name instead of separate
306 char * and length parameters. C<flags> is currently unused.
312 Perl_gv_init_sv(pTHX_ GV *gv, HV *stash, SV* namesv, U32 flags)
316 PERL_ARGS_ASSERT_GV_INIT_SV;
317 namepv = SvPV(namesv, namelen);
320 gv_init_pvn(gv, stash, namepv, namelen, flags);
324 Perl_gv_init_pv(pTHX_ GV *gv, HV *stash, const char *name, U32 flags)
326 PERL_ARGS_ASSERT_GV_INIT_PV;
327 gv_init_pvn(gv, stash, name, strlen(name), flags);
331 Perl_gv_init_pvn(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, U32 flags)
334 const U32 old_type = SvTYPE(gv);
335 const bool doproto = old_type > SVt_NULL;
336 char * const proto = (doproto && SvPOK(gv))
337 ? ((void)(SvIsCOW(gv) && (sv_force_normal((SV *)gv), 0)), SvPVX(gv))
339 const STRLEN protolen = proto ? SvCUR(gv) : 0;
340 const U32 proto_utf8 = proto ? SvUTF8(gv) : 0;
341 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
342 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
344 PERL_ARGS_ASSERT_GV_INIT_PVN;
345 assert (!(proto && has_constant));
348 /* The constant has to be a simple scalar type. */
349 switch (SvTYPE(has_constant)) {
354 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
355 sv_reftype(has_constant, 0));
363 if (old_type < SVt_PVGV) {
364 if (old_type >= SVt_PV)
366 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
374 Safefree(SvPVX_mutable(gv));
379 GvGP_set(gv, Perl_newGP(aTHX_ gv));
382 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
383 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
384 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
385 GvMULTI_on(gv); /* _was_ mentioned */
389 /* newCONSTSUB takes ownership of the reference from us. */
390 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
391 /* In case op.c:S_process_special_blocks stole it: */
393 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
394 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
395 /* If this reference was a copy of another, then the subroutine
396 must have been "imported", by a Perl space assignment to a GV
397 from a reference to CV. */
398 if (exported_constant)
399 GvIMPORTED_CV_on(gv);
400 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
405 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
406 SV_HAS_TRAILING_NUL);
407 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
413 S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
415 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
427 #ifdef PERL_DONT_CREATE_GVSV
435 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
436 If we just cast GvSVn(gv) to void, it ignores evaluating it for
443 static void core_xsub(pTHX_ CV* cv);
446 S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
447 const char * const name, const STRLEN len)
449 const int code = keyword(name, len, 1);
450 static const char file[] = __FILE__;
451 CV *cv, *oldcompcv = NULL;
453 bool ampable = TRUE; /* &{}-able */
454 COP *oldcurcop = NULL;
455 yy_parser *oldparser = NULL;
456 I32 oldsavestack_ix = 0;
461 if (!code) return NULL; /* Not a keyword */
462 switch (code < 0 ? -code : code) {
463 /* no support for \&CORE::infix;
464 no support for funcs that do not parse like funcs */
465 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
466 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp:
467 case KEY_default : case KEY_DESTROY:
468 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
469 case KEY_END : case KEY_eq : case KEY_eval :
470 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
471 case KEY_given : case KEY_goto : case KEY_grep :
472 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
473 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
474 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
475 case KEY_package: case KEY_print: case KEY_printf:
476 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
477 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
478 case KEY_s : case KEY_say : case KEY_sort :
479 case KEY_state: case KEY_sub :
480 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
481 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
482 case KEY_x : case KEY_xor : case KEY_y :
485 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
486 case KEY_each : case KEY_eof : case KEY_exec : case KEY_exists:
492 case KEY_splice: case KEY_split:
495 case KEY_truncate: case KEY_unlink:
502 gv_init(gv, stash, name, len, TRUE);
507 oldcurcop = PL_curcop;
508 oldparser = PL_parser;
509 lex_start(NULL, NULL, 0);
510 oldcompcv = PL_compcv;
511 PL_compcv = NULL; /* Prevent start_subparse from setting
513 oldsavestack_ix = start_subparse(FALSE,0);
517 /* Avoid calling newXS, as it calls us, and things start to
519 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
523 CvXSUB(cv) = core_xsub;
525 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
527 (void)gv_fetchfile(file);
528 CvFILE(cv) = (char *)file;
529 /* XXX This is inefficient, as doing things this order causes
530 a prototype check in newATTRSUB. But we have to do
531 it this order as we need an op number before calling
533 (void)core_prototype((SV *)cv, name, code, &opnum);
535 (void)hv_store(stash,name,len,(SV *)gv,0);
541 /* newATTRSUB will free the CV and return NULL if we're still
542 compiling after a syntax error */
543 if ((cv = newATTRSUB_flags(
544 oldsavestack_ix, (OP *)gv,
549 : newSVpvn(name,len),
554 assert(GvCV(gv) == orig_cv);
555 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
556 && opnum != OP_UNDEF)
557 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
560 PL_parser = oldparser;
561 PL_curcop = oldcurcop;
562 PL_compcv = oldcompcv;
565 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
567 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
569 SvREFCNT_dec(opnumsv);
576 =for apidoc gv_fetchmeth
578 Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
580 =for apidoc gv_fetchmeth_sv
582 Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
583 of an SV instead of a string/length pair.
589 Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
593 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
594 namepv = SvPV(namesv, namelen);
597 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
601 =for apidoc gv_fetchmeth_pv
603 Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
604 instead of a string/length pair.
610 Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
612 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
613 return gv_fetchmeth_pvn(stash, name, strlen(name), level, flags);
617 =for apidoc gv_fetchmeth_pvn
619 Returns the glob with the given C<name> and a defined subroutine or
620 C<NULL>. The glob lives in the given C<stash>, or in the stashes
621 accessible via @ISA and UNIVERSAL::.
623 The argument C<level> should be either 0 or -1. If C<level==0>, as a
624 side-effect creates a glob with the given C<name> in the given C<stash>
625 which in the case of success contains an alias for the subroutine, and sets
626 up caching info for this glob.
628 The only significant values for C<flags> are GV_SUPER and SVf_UTF8.
630 GV_SUPER indicates that we want to look up the method in the superclasses
634 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
635 visible to Perl code. So when calling C<call_sv>, you should not use
636 the GV directly; instead, you should use the method's CV, which can be
637 obtained from the GV with the C<GvCV> macro.
642 /* NOTE: No support for tied ISA */
645 Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
652 HV* cstash, *cachestash;
653 GV* candidate = NULL;
657 I32 create = (level >= 0) ? 1 : 0;
660 U32 is_utf8 = flags & SVf_UTF8;
662 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
664 /* UNIVERSAL methods should be callable without a stash */
666 create = 0; /* probably appropriate */
667 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
673 hvname = HvNAME_get(stash);
675 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
680 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
681 flags & GV_SUPER ? "SUPER " : "",name,hvname) );
683 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
685 if (flags & GV_SUPER) {
686 if (!HvAUX(stash)->xhv_mro_meta->super)
687 HvAUX(stash)->xhv_mro_meta->super = newHV();
688 cachestash = HvAUX(stash)->xhv_mro_meta->super;
690 else cachestash = stash;
692 /* check locally for a real method or a cache entry */
693 gvp = (GV**)hv_fetch(cachestash, name, is_utf8 ? -(I32)len : (I32)len,
699 if (SvTYPE(topgv) != SVt_PVGV)
700 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
701 if ((cand_cv = GvCV(topgv))) {
702 /* If genuine method or valid cache entry, use it */
703 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
707 /* stale cache entry, junk it and move on */
708 SvREFCNT_dec_NN(cand_cv);
709 GvCV_set(topgv, NULL);
714 else if (GvCVGEN(topgv) == topgen_cmp) {
715 /* cache indicates no such method definitively */
718 else if (stash == cachestash
719 && len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
720 && strnEQ(hvname, "CORE", 4)
721 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
725 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
726 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
727 items = AvFILLp(linear_av); /* no +1, to skip over self */
729 linear_sv = *linear_svp++;
731 cstash = gv_stashsv(linear_sv, 0);
734 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
735 "Can't locate package %"SVf" for @%"HEKf"::ISA",
737 HEKfARG(HvNAME_HEK(stash)));
743 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
745 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
746 const char *hvname = HvNAME(cstash); assert(hvname);
747 if (strnEQ(hvname, "CORE", 4)
749 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
755 else candidate = *gvp;
758 if (SvTYPE(candidate) != SVt_PVGV)
759 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
760 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
762 * Found real method, cache method in topgv if:
763 * 1. topgv has no synonyms (else inheritance crosses wires)
764 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
766 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
767 CV *old_cv = GvCV(topgv);
768 SvREFCNT_dec(old_cv);
769 SvREFCNT_inc_simple_void_NN(cand_cv);
770 GvCV_set(topgv, cand_cv);
771 GvCVGEN(topgv) = topgen_cmp;
777 /* Check UNIVERSAL without caching */
778 if(level == 0 || level == -1) {
779 candidate = gv_fetchmeth_pvn(NULL, name, len, 1, flags &~GV_SUPER);
781 cand_cv = GvCV(candidate);
782 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
783 CV *old_cv = GvCV(topgv);
784 SvREFCNT_dec(old_cv);
785 SvREFCNT_inc_simple_void_NN(cand_cv);
786 GvCV_set(topgv, cand_cv);
787 GvCVGEN(topgv) = topgen_cmp;
793 if (topgv && GvREFCNT(topgv) == 1) {
794 /* cache the fact that the method is not defined */
795 GvCVGEN(topgv) = topgen_cmp;
802 =for apidoc gv_fetchmeth_autoload
804 This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
807 =for apidoc gv_fetchmeth_sv_autoload
809 Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
810 of an SV instead of a string/length pair.
816 Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
820 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
821 namepv = SvPV(namesv, namelen);
824 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
828 =for apidoc gv_fetchmeth_pv_autoload
830 Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
831 instead of a string/length pair.
837 Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
839 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
840 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
844 =for apidoc gv_fetchmeth_pvn_autoload
846 Same as gv_fetchmeth_pvn(), but looks for autoloaded subroutines too.
847 Returns a glob for the subroutine.
849 For an autoloaded subroutine without a GV, will create a GV even
850 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
851 of the result may be zero.
853 Currently, the only significant value for C<flags> is SVf_UTF8.
859 Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
861 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
863 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
870 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
871 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
873 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
876 if (!(CvROOT(cv) || CvXSUB(cv)))
878 /* Have an autoload */
879 if (level < 0) /* Cannot do without a stub */
880 gv_fetchmeth_pvn(stash, name, len, 0, flags);
881 gvp = (GV**)hv_fetch(stash, name,
882 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
891 =for apidoc gv_fetchmethod_autoload
893 Returns the glob which contains the subroutine to call to invoke the method
894 on the C<stash>. In fact in the presence of autoloading this may be the
895 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
898 The third parameter of C<gv_fetchmethod_autoload> determines whether
899 AUTOLOAD lookup is performed if the given method is not present: non-zero
900 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
901 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
902 with a non-zero C<autoload> parameter.
904 These functions grant C<"SUPER"> token
905 as a prefix of the method name. Note
906 that if you want to keep the returned glob for a long time, you need to
907 check for it being "AUTOLOAD", since at the later time the call may load a
908 different subroutine due to $AUTOLOAD changing its value. Use the glob
909 created as a side effect to do this.
911 These functions have the same side-effects as C<gv_fetchmeth> with
912 C<level==0>. The warning against passing the GV returned by
913 C<gv_fetchmeth> to C<call_sv> applies equally to these functions.
919 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
921 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
923 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
927 Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
931 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
932 namepv = SvPV(namesv, namelen);
935 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
939 Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
941 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
942 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
945 /* Don't merge this yet, as it's likely to get a len parameter, and possibly
948 Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
952 const char *nsplit = NULL;
955 const char * const origname = name;
956 SV *const error_report = MUTABLE_SV(stash);
957 const U32 autoload = flags & GV_AUTOLOAD;
958 const U32 do_croak = flags & GV_CROAK;
959 const U32 is_utf8 = flags & SVf_UTF8;
961 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
963 if (SvTYPE(stash) < SVt_PVHV)
966 /* The only way stash can become NULL later on is if nsplit is set,
967 which in turn means that there is no need for a SVt_PVHV case
968 the error reporting code. */
971 for (nend = name; *nend || nend != (origname + len); nend++) {
976 else if (*nend == ':' && *(nend + 1) == ':') {
982 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
983 /* ->SUPER::method should really be looked up in original stash */
984 stash = CopSTASH(PL_curcop);
986 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
987 origname, HvENAME_get(stash), name) );
989 else if ((nsplit - origname) >= 7 &&
990 strnEQ(nsplit - 7, "::SUPER", 7)) {
991 /* don't autovifify if ->NoSuchStash::SUPER::method */
992 stash = gv_stashpvn(origname, nsplit - origname - 7, is_utf8);
993 if (stash) flags |= GV_SUPER;
996 /* don't autovifify if ->NoSuchStash::method */
997 stash = gv_stashpvn(origname, nsplit - origname, is_utf8);
1002 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
1004 if (strEQ(name,"import") || strEQ(name,"unimport"))
1005 gv = MUTABLE_GV(&PL_sv_yes);
1007 gv = gv_autoload_pvn(
1008 ostash, name, nend - name, GV_AUTOLOAD_ISMETHOD|flags
1010 if (!gv && do_croak) {
1011 /* Right now this is exclusively for the benefit of S_method_common
1014 /* If we can't find an IO::File method, it might be a call on
1015 * a filehandle. If IO:File has not been loaded, try to
1016 * require it first instead of croaking */
1017 const char *stash_name = HvNAME_get(stash);
1018 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1019 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1020 STR_WITH_LEN("IO/File.pm"), 0,
1021 HV_FETCH_ISEXISTS, NULL, 0)
1023 require_pv("IO/File.pm");
1024 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
1029 "Can't locate object method \"%"UTF8f
1030 "\" via package \"%"HEKf"\"",
1031 UTF8fARG(is_utf8, nend - name, name),
1032 HEKfARG(HvNAME_HEK(stash)));
1038 packnamesv = newSVpvn_flags(origname, nsplit - origname,
1039 SVs_TEMP | is_utf8);
1041 packnamesv = error_report;
1045 "Can't locate object method \"%"UTF8f
1046 "\" via package \"%"SVf"\""
1047 " (perhaps you forgot to load \"%"SVf"\"?)",
1048 UTF8fARG(is_utf8, nend - name, name),
1049 SVfARG(packnamesv), SVfARG(packnamesv));
1053 else if (autoload) {
1054 CV* const cv = GvCV(gv);
1055 if (!CvROOT(cv) && !CvXSUB(cv)) {
1059 if (CvANON(cv) || !CvGV(cv))
1063 if (GvCV(stubgv) != cv) /* orphaned import */
1066 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1067 GvNAME(stubgv), GvNAMELEN(stubgv),
1068 GV_AUTOLOAD_ISMETHOD
1069 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
1079 Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
1083 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
1084 namepv = SvPV(namesv, namelen);
1087 return gv_autoload_pvn(stash, namepv, namelen, flags);
1091 Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
1093 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
1094 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
1098 Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
1106 SV *packname = NULL;
1107 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
1109 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
1111 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
1114 if (SvTYPE(stash) < SVt_PVHV) {
1115 STRLEN packname_len = 0;
1116 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1117 packname = newSVpvn_flags(packname_ptr, packname_len,
1118 SVs_TEMP | SvUTF8(stash));
1122 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
1123 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
1125 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, is_utf8)))
1129 if (!(CvROOT(cv) || CvXSUB(cv)))
1133 * Inheriting AUTOLOAD for non-methods works ... for now.
1136 !(flags & GV_AUTOLOAD_ISMETHOD)
1137 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
1139 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
1140 "Use of inherited AUTOLOAD for non-method %"SVf
1141 "::%"UTF8f"() is deprecated",
1143 UTF8fARG(is_utf8, len, name));
1146 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1147 * and split that value on the last '::', pass along the same data
1148 * via the SvPVX field in the CV, and the stash in CvSTASH.
1150 * Due to an unfortunate accident of history, the SvPVX field
1151 * serves two purposes. It is also used for the subroutine's pro-
1152 * type. Since SvPVX has been documented as returning the sub name
1153 * for a long time, but not as returning the prototype, we have
1154 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1157 * We put the prototype in the same allocated buffer, but after
1158 * the sub name. The SvPOK flag indicates the presence of a proto-
1159 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1160 * If both flags are on, then SvLEN is used to indicate the end of
1161 * the prototype (artificially lower than what is actually allo-
1162 * cated), at the risk of having to reallocate a few bytes unneces-
1163 * sarily--but that should happen very rarely, if ever.
1165 * We use SvUTF8 for both prototypes and sub names, so if one is
1166 * UTF8, the other must be upgraded.
1168 CvSTASH_set(cv, stash);
1169 if (SvPOK(cv)) { /* Ouch! */
1170 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
1172 const char *proto = CvPROTO(cv);
1175 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1176 ulen = SvCUR(tmpsv);
1177 SvCUR(tmpsv)++; /* include null in string */
1179 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1181 SvTEMP_on(tmpsv); /* Allow theft */
1182 sv_setsv_nomg((SV *)cv, tmpsv);
1184 SvREFCNT_dec_NN(tmpsv);
1185 SvLEN(cv) = SvCUR(cv) + 1;
1189 sv_setpvn((SV *)cv, name, len);
1193 else SvUTF8_off(cv);
1199 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1200 * The subroutine's original name may not be "AUTOLOAD", so we don't
1201 * use that, but for lack of anything better we will use the sub's
1202 * original package to look up $AUTOLOAD.
1204 varstash = GvSTASH(CvGV(cv));
1205 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
1209 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
1210 #ifdef PERL_DONT_CREATE_GVSV
1211 GvSV(vargv) = newSV(0);
1215 varsv = GvSVn(vargv);
1216 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1217 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
1218 sv_setsv(varsv, packname);
1219 sv_catpvs(varsv, "::");
1220 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1221 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
1224 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
1232 /* require_tie_mod() internal routine for requiring a module
1233 * that implements the logic of automatic ties like %! and %-
1235 * The "gv" parameter should be the glob.
1236 * "varpv" holds the name of the var, used for error messages.
1237 * "namesv" holds the module name. Its refcount will be decremented.
1238 * "methpv" holds the method name to test for to check that things
1239 * are working reasonably close to as expected.
1240 * "flags": if flag & 1 then save the scalar before loading.
1241 * For the protection of $! to work (it is set by this routine)
1242 * the sv slot must already be magicalized.
1245 S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
1248 HV* stash = gv_stashsv(namesv, 0);
1250 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1252 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
1253 SV *module = newSVsv(namesv);
1254 char varname = *varpv; /* varpv might be clobbered by load_module,
1255 so save it. For the moment it's always
1257 const char type = varname == '[' ? '$' : '%';
1263 PUSHSTACKi(PERLSI_MAGIC);
1264 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
1266 stash = gv_stashsv(namesv, 0);
1268 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1269 type, varname, SVfARG(namesv));
1270 else if (!gv_fetchmethod(stash, methpv))
1271 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1272 type, varname, SVfARG(namesv), methpv);
1275 else SvREFCNT_dec_NN(namesv);
1280 =for apidoc gv_stashpv
1282 Returns a pointer to the stash for a specified package. Uses C<strlen> to
1283 determine the length of C<name>, then calls C<gv_stashpvn()>.
1289 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
1291 PERL_ARGS_ASSERT_GV_STASHPV;
1292 return gv_stashpvn(name, strlen(name), create);
1296 =for apidoc gv_stashpvn
1298 Returns a pointer to the stash for a specified package. The C<namelen>
1299 parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1300 to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1301 created if it does not already exist. If the package does not exist and
1302 C<flags> is 0 (or any other setting that does not create packages) then NULL
1305 Flags may be one of:
1314 The most important of which are probably GV_ADD and SVf_UTF8.
1320 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
1326 U32 tmplen = namelen + 2;
1328 PERL_ARGS_ASSERT_GV_STASHPVN;
1330 if (tmplen <= sizeof smallbuf)
1333 Newx(tmpbuf, tmplen, char);
1334 Copy(name, tmpbuf, namelen, char);
1335 tmpbuf[namelen] = ':';
1336 tmpbuf[namelen+1] = ':';
1337 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
1338 if (tmpbuf != smallbuf)
1342 stash = GvHV(tmpgv);
1343 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
1345 if (!HvNAME_get(stash)) {
1346 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1348 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1349 /* If the containing stash has multiple effective
1350 names, see that this one gets them, too. */
1351 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1352 mro_package_moved(stash, NULL, tmpgv, 1);
1358 =for apidoc gv_stashsv
1360 Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
1366 Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
1369 const char * const ptr = SvPV_const(sv,len);
1371 PERL_ARGS_ASSERT_GV_STASHSV;
1373 return gv_stashpvn(ptr, len, flags | SvUTF8(sv));
1378 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
1379 PERL_ARGS_ASSERT_GV_FETCHPV;
1380 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
1384 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
1386 const char * const nambeg =
1387 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
1388 PERL_ARGS_ASSERT_GV_FETCHSV;
1389 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1392 PERL_STATIC_INLINE void
1393 S_gv_magicalize_isa(pTHX_ GV *gv)
1397 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1401 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1405 /* This function grabs name and tries to split a stash and glob
1406 * from its contents. TODO better description, comments
1408 * If the function returns TRUE and 'name == name_end', then
1409 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1411 PERL_STATIC_INLINE bool
1412 S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1413 STRLEN *len, const char *nambeg, STRLEN full_len,
1414 const U32 is_utf8, const I32 add)
1416 const char *name_cursor;
1417 const char *const name_end = nambeg + full_len;
1418 const char *const name_em1 = name_end - 1;
1420 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1422 if (full_len > 2 && **name == '*' && isIDFIRST_lazy_if(*name + 1, is_utf8)) {
1423 /* accidental stringify on a GV? */
1427 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1428 if (name_cursor < name_em1 &&
1429 ((*name_cursor == ':' && name_cursor[1] == ':')
1430 || *name_cursor == '\''))
1433 *stash = PL_defstash;
1434 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1437 *len = name_cursor - *name;
1438 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1441 if (*name_cursor == ':') {
1447 Newx(tmpbuf, *len+2, char);
1448 Copy(*name, tmpbuf, *len, char);
1449 tmpbuf[(*len)++] = ':';
1450 tmpbuf[(*len)++] = ':';
1453 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -(*len) : *len, add);
1454 *gv = gvp ? *gvp : NULL;
1455 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1456 if (SvTYPE(*gv) != SVt_PVGV)
1457 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1463 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1466 if (!(*stash = GvHV(*gv))) {
1467 *stash = GvHV(*gv) = newHV();
1468 if (!HvNAME_get(*stash)) {
1469 if (GvSTASH(*gv) == PL_defstash && *len == 6
1470 && strnEQ(*name, "CORE", 4))
1471 hv_name_set(*stash, "CORE", 4, 0);
1474 *stash, nambeg, name_cursor-nambeg, is_utf8
1476 /* If the containing stash has multiple effective
1477 names, see that this one gets them, too. */
1478 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1479 mro_package_moved(*stash, NULL, *gv, 1);
1482 else if (!HvNAME_get(*stash))
1483 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1486 if (*name_cursor == ':')
1488 *name = name_cursor+1;
1489 if (*name == name_end) {
1491 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1496 *len = name_cursor - *name;
1500 /* Checks if an unqualified name is in the main stash */
1501 PERL_STATIC_INLINE bool
1502 S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
1504 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
1506 /* If it's an alphanumeric variable */
1507 if ( len && isIDFIRST_lazy_if(name, is_utf8) ) {
1508 /* Some "normal" variables are always in main::,
1509 * like INC or STDOUT.
1517 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1518 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1519 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
1523 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1528 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1529 && name[3] == 'I' && name[4] == 'N')
1533 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1534 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1535 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
1539 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1540 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1546 /* *{""}, or a special variable like $@ */
1554 /* This function is called if parse_gv_stash_name() failed to
1555 * find a stash, or if GV_NOTQUAL or an empty name was passed
1556 * to gv_fetchpvn_flags.
1558 * It returns FALSE if the default stash can't be found nor created,
1559 * which might happen during global destruction.
1561 PERL_STATIC_INLINE bool
1562 S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1563 const U32 is_utf8, const I32 add,
1564 const svtype sv_type)
1566 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1568 /* No stash in name, so see how we can default */
1570 if ( gv_is_in_main(name, len, is_utf8) ) {
1571 *stash = PL_defstash;
1574 if (IN_PERL_COMPILETIME) {
1575 *stash = PL_curstash;
1576 if (add && (PL_hints & HINT_STRICT_VARS) &&
1577 sv_type != SVt_PVCV &&
1578 sv_type != SVt_PVGV &&
1579 sv_type != SVt_PVFM &&
1580 sv_type != SVt_PVIO &&
1581 !(len == 1 && sv_type == SVt_PV &&
1582 (*name == 'a' || *name == 'b')) )
1584 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -len : len,0);
1585 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1586 SvTYPE(*gvp) != SVt_PVGV)
1590 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1591 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1592 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1594 /* diag_listed_as: Variable "%s" is not imported%s */
1596 aTHX_ packWARN(WARN_MISC),
1597 "Variable \"%c%"UTF8f"\" is not imported",
1598 sv_type == SVt_PVAV ? '@' :
1599 sv_type == SVt_PVHV ? '%' : '$',
1600 UTF8fARG(is_utf8, len, name));
1603 aTHX_ packWARN(WARN_MISC),
1604 "\t(Did you mean &%"UTF8f" instead?)\n",
1605 UTF8fARG(is_utf8, len, name)
1612 /* Use the current op's stash */
1613 *stash = CopSTASH(PL_curcop);
1618 if (add && !PL_in_clean_all) {
1619 SV * const err = Perl_mess(aTHX_
1620 "Global symbol \"%s%"UTF8f
1621 "\" requires explicit package name",
1622 (sv_type == SVt_PV ? "$"
1623 : sv_type == SVt_PVAV ? "@"
1624 : sv_type == SVt_PVHV ? "%"
1625 : ""), UTF8fARG(is_utf8, len, name));
1630 /* To maintain the output of errors after the strict exception
1631 * above, and to keep compat with older releases, rather than
1632 * placing the variables in the pad, we place
1633 * them in the <none>:: stash.
1635 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1637 /* symbol table under destruction */
1646 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1652 /* gv_magicalize() is called by gv_fetchpvn_flags when creating
1654 * Note that it does not insert the GV into the stash prior to
1655 * magicalization, which some variables require need in order
1656 * to work (like $[, %+, %-, %!), so callers must take care of
1659 * The return value has a specific meaning for gv_fetchpvn_flags:
1660 * If it returns true, and the gv is empty, it indicates that its
1661 * refcount should be decreased.
1663 PERL_STATIC_INLINE bool
1664 S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
1665 bool addmg, const svtype sv_type)
1669 PERL_ARGS_ASSERT_GV_MAGICALIZE;
1671 if (stash != PL_defstash) { /* not the main stash */
1672 /* We only have to check for a few names here: a, b, EXPORT, ISA
1673 and VERSION. All the others apply only to the main stash or to
1674 CORE (which is checked right after this). */
1676 const char * const name2 = name + 1;
1679 if (strnEQ(name2, "XPORT", 5))
1683 if (strEQ(name2, "SA"))
1684 gv_magicalize_isa(gv);
1687 if (strEQ(name2, "ERSION"))
1692 if (len == 1 && sv_type == SVt_PV)
1701 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1702 /* Avoid null warning: */
1703 const char * const stashname = HvNAME(stash); assert(stashname);
1704 if (strnEQ(stashname, "CORE", 4))
1705 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
1712 /* Nothing else to do.
1713 The compiler will probably turn the switch statement into a
1714 branch table. Make sure we avoid even that small overhead for
1715 the common case of lower case variable names. (On EBCDIC
1716 platforms, we can't just do:
1717 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1718 because cases like '\027' in the switch statement below are
1719 C1 (non-ASCII) controls on those platforms, so the remapping
1720 would make them larger than 'V')
1725 const char * const name2 = name + 1;
1728 if (strEQ(name2, "RGV")) {
1729 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1731 else if (strEQ(name2, "RGVOUT")) {
1736 if (strnEQ(name2, "XPORT", 5))
1740 if (strEQ(name2, "SA")) {
1741 gv_magicalize_isa(gv);
1745 if (strEQ(name2, "IG")) {
1748 if (!PL_psig_name) {
1749 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
1750 Newxz(PL_psig_pend, SIG_SIZE, int);
1751 PL_psig_ptr = PL_psig_name + SIG_SIZE;
1753 /* I think that the only way to get here is to re-use an
1754 embedded perl interpreter, where the previous
1755 use didn't clean up fully because
1756 PL_perl_destruct_level was 0. I'm not sure that we
1757 "support" that, in that I suspect in that scenario
1758 there are sufficient other garbage values left in the
1759 interpreter structure that something else will crash
1760 before we get here. I suspect that this is one of
1761 those "doctor, it hurts when I do this" bugs. */
1762 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
1763 Zero(PL_psig_pend, SIG_SIZE, int);
1767 hv_magic(hv, NULL, PERL_MAGIC_sig);
1768 for (i = 1; i < SIG_SIZE; i++) {
1769 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1771 sv_setsv(*init, &PL_sv_undef);
1776 if (strEQ(name2, "ERSION"))
1779 case '\003': /* $^CHILD_ERROR_NATIVE */
1780 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1783 case '\005': /* $^ENCODING */
1784 if (strEQ(name2, "NCODING"))
1787 case '\007': /* $^GLOBAL_PHASE */
1788 if (strEQ(name2, "LOBAL_PHASE"))
1791 case '\014': /* $^LAST_FH */
1792 if (strEQ(name2, "AST_FH"))
1795 case '\015': /* $^MATCH */
1796 if (strEQ(name2, "ATCH")) {
1797 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1801 case '\017': /* $^OPEN */
1802 if (strEQ(name2, "PEN"))
1805 case '\020': /* $^PREMATCH $^POSTMATCH */
1806 if (strEQ(name2, "REMATCH")) {
1807 paren = RX_BUFF_IDX_CARET_PREMATCH;
1810 if (strEQ(name2, "OSTMATCH")) {
1811 paren = RX_BUFF_IDX_CARET_POSTMATCH;
1815 case '\024': /* ${^TAINT} */
1816 if (strEQ(name2, "AINT"))
1819 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1820 if (strEQ(name2, "NICODE"))
1822 if (strEQ(name2, "TF8LOCALE"))
1824 if (strEQ(name2, "TF8CACHE"))
1827 case '\027': /* $^WARNING_BITS */
1828 if (strEQ(name2, "ARNING_BITS"))
1841 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1843 /* This snippet is taken from is_gv_magical */
1844 const char *end = name + len;
1845 while (--end > name) {
1849 paren = strtoul(name, NULL, 10);
1855 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1856 be case '\0' in this switch statement (ie a default case) */
1859 paren = RX_BUFF_IDX_FULLMATCH;
1862 paren = RX_BUFF_IDX_PREMATCH;
1865 paren = RX_BUFF_IDX_POSTMATCH;
1867 #ifdef PERL_SAWAMPERSAND
1869 sv_type == SVt_PVAV ||
1870 sv_type == SVt_PVHV ||
1871 sv_type == SVt_PVCV ||
1872 sv_type == SVt_PVFM ||
1874 )) { PL_sawampersand |=
1878 ? SAWAMPERSAND_MIDDLE
1879 : SAWAMPERSAND_RIGHT;
1892 paren = *name - '0';
1895 /* Flag the capture variables with a NULL mg_ptr
1896 Use mg_len for the array index to lookup. */
1897 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
1901 sv_setpv(GvSVn(gv),PL_chopset);
1905 #ifdef COMPLEX_STATUS
1906 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1912 /* If %! has been used, automatically load Errno.pm. */
1914 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1916 /* magicalization must be done before require_tie_mod is called */
1917 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1919 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1926 GvMULTI_on(gv); /* no used once warnings here */
1928 AV* const av = GvAVn(gv);
1929 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
1931 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
1932 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1934 SvREADONLY_on(GvSVn(gv));
1937 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1939 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
1947 if (sv_type == SVt_PV)
1948 /* diag_listed_as: $* is no longer supported */
1949 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1950 "$%c is no longer supported", *name);
1952 case '\010': /* $^H */
1954 HV *const hv = GvHVn(gv);
1955 hv_magic(hv, NULL, PERL_MAGIC_hints);
1959 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
1960 && FEATURE_ARYBASE_IS_ENABLED) {
1961 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
1964 else goto magicalize;
1966 case '\023': /* $^S */
1968 SvREADONLY_on(GvSVn(gv));
1984 case '\001': /* $^A */
1985 case '\003': /* $^C */
1986 case '\004': /* $^D */
1987 case '\005': /* $^E */
1988 case '\006': /* $^F */
1989 case '\011': /* $^I, NOT \t in EBCDIC */
1990 case '\016': /* $^N */
1991 case '\017': /* $^O */
1992 case '\020': /* $^P */
1993 case '\024': /* $^T */
1994 case '\027': /* $^W */
1996 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1999 case '\014': /* $^L */
2000 sv_setpvs(GvSVn(gv),"\f");
2003 sv_setpvs(GvSVn(gv),"\034");
2007 SV * const sv = GvSV(gv);
2008 if (!sv_derived_from(PL_patchlevel, "version"))
2009 upg_version(PL_patchlevel, TRUE);
2010 GvSV(gv) = vnumify(PL_patchlevel);
2011 SvREADONLY_on(GvSV(gv));
2015 case '\026': /* $^V */
2017 SV * const sv = GvSV(gv);
2018 GvSV(gv) = new_version(PL_patchlevel);
2019 SvREADONLY_on(GvSV(gv));
2025 if (sv_type == SVt_PV)
2033 /* This function is called when the stash already holds the GV of the magic
2034 * variable we're looking for, but we need to check that it has the correct
2035 * kind of magic. For example, if someone first uses $! and then %!, the
2036 * latter would end up here, and we add the Errno tie to the HASH slot of
2039 PERL_STATIC_INLINE void
2040 S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2042 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2044 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2046 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
2047 else if (*name == '-' || *name == '+')
2048 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
2049 } else if (sv_type == SVt_PV) {
2050 if (*name == '*' || *name == '#') {
2051 /* diag_listed_as: $* is no longer supported */
2052 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2054 "$%c is no longer supported", *name);
2057 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2060 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
2062 #ifdef PERL_SAWAMPERSAND
2064 PL_sawampersand |= SAWAMPERSAND_LEFT;
2068 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2072 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2081 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2082 const svtype sv_type)
2085 const char *name = nambeg;
2090 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2091 const I32 no_expand = flags & GV_NOEXPAND;
2092 const I32 add = flags & ~GV_NOADD_MASK;
2093 const U32 is_utf8 = flags & SVf_UTF8;
2094 bool addmg = cBOOL(flags & GV_ADDMG);
2095 const char *const name_end = nambeg + full_len;
2098 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2100 /* If we have GV_NOTQUAL, the caller promised that
2101 * there is no stash, so we can skip the check.
2102 * Similarly if full_len is 0, since then we're
2103 * dealing with something like *{""} or ""->foo()
2105 if ((flags & GV_NOTQUAL) || !full_len) {
2108 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2109 if (name == name_end) return gv;
2115 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2119 /* By this point we should have a stash and a name */
2120 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -len : len,add);
2121 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2122 if (addmg) gv = (GV *)newSV(0);
2125 else gv = *gvp, addmg = 0;
2126 /* From this point on, addmg means gv has not been inserted in the
2129 if (SvTYPE(gv) == SVt_PVGV) {
2130 /* The GV already exists, so return it, but check if we need to do
2131 * anything else with it before that.
2134 /* This is the heuristic that handles if a variable triggers the
2135 * 'used only once' warning. If there's already a GV in the stash
2136 * with this name, then we assume that the variable has been used
2137 * before and turn its MULTI flag on.
2138 * It's a heuristic because it can easily be "tricked", like with
2139 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2140 * not warning about $main::foo being used just once
2143 gv_init_svtype(gv, sv_type);
2144 /* You reach this path once the typeglob has already been created,
2145 either by the same or a different sigil. If this path didn't
2146 exist, then (say) referencing $! first, and %! second would
2147 mean that %! was not handled correctly. */
2148 if (len == 1 && stash == PL_defstash) {
2149 maybe_multimagic_gv(gv, name, sv_type);
2151 else if (len == 3 && sv_type == SVt_PVAV
2152 && strnEQ(name, "ISA", 3)
2153 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2154 gv_magicalize_isa(gv);
2157 } else if (no_init) {
2161 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2162 * don't expand it to a glob. This is an optimization so that things
2163 * copying constants over, like Exporter, don't have to be rewritten
2164 * to take into account that you can store more than just globs in
2167 else if (no_expand && SvROK(gv)) {
2172 /* Adding a new symbol.
2173 Unless of course there was already something non-GV here, in which case
2174 we want to behave as if there was always a GV here, containing some sort
2176 Otherwise we run the risk of creating things like GvIO, which can cause
2177 subtle bugs. eg the one that tripped up SQL::Translator */
2179 faking_it = SvOK(gv);
2181 if (add & GV_ADDWARN)
2182 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2183 "Had to create %"UTF8f" unexpectedly",
2184 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2185 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2187 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
2190 /* First, store the gv in the symtab if we're adding magic,
2191 * but only for non-empty GVs
2193 #define GvEMPTY(gv) !(GvAV(gv) || GvHV(gv) || GvIO(gv) \
2194 || GvCV(gv) || (GvSV(gv) && SvOK(GvSV(gv))))
2196 if ( addmg && !GvEMPTY(gv) ) {
2197 (void)hv_store(stash,name,len,(SV *)gv,0);
2200 /* set up magic where warranted */
2201 if ( gv_magicalize(gv, stash, name, len, addmg, sv_type) ) {
2204 if ( GvSV(gv) && SvMAGICAL(GvSV(gv)) ) {
2205 /* The GV was and still is "empty", except that now
2206 * it has the magic flags turned on, so we want it
2207 * stored in the symtab.
2209 (void)hv_store(stash,name,len,(SV *)gv,0);
2212 /* Most likely the temporary GV created above */
2213 SvREFCNT_dec_NN(gv);
2219 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
2224 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
2227 const HV * const hv = GvSTASH(gv);
2229 PERL_ARGS_ASSERT_GV_FULLNAME4;
2231 sv_setpv(sv, prefix ? prefix : "");
2233 if (hv && (name = HvNAME(hv))) {
2234 const STRLEN len = HvNAMELEN(hv);
2235 if (keepmain || strnNE(name, "main", len)) {
2236 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
2240 else sv_catpvs(sv,"__ANON__::");
2241 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
2245 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
2247 const GV * const egv = GvEGVx(gv);
2249 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2251 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
2255 Perl_gv_check(pTHX_ HV *stash)
2260 PERL_ARGS_ASSERT_GV_CHECK;
2262 if (!HvARRAY(stash))
2264 for (i = 0; i <= (I32) HvMAX(stash); i++) {
2266 /* SvIsCOW is unused on HVs, so we can use it to mark stashes we
2267 are currently searching through recursively. */
2269 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
2272 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
2273 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
2275 if (hv != PL_defstash && hv != stash && !SvIsCOW(hv))
2276 gv_check(hv); /* nested package */
2278 else if ( *HeKEY(entry) != '_'
2279 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
2281 gv = MUTABLE_GV(HeVAL(entry));
2282 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
2285 CopLINE_set(PL_curcop, GvLINE(gv));
2287 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2289 CopFILEGV(PL_curcop)
2290 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2292 Perl_warner(aTHX_ packWARN(WARN_ONCE),
2293 "Name \"%"HEKf"::%"HEKf
2294 "\" used only once: possible typo",
2295 HEKfARG(HvNAME_HEK(stash)),
2296 HEKfARG(GvNAME_HEK(gv)));
2304 Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
2307 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
2308 assert(!(flags & ~SVf_UTF8));
2310 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2311 UTF8fARG(flags, strlen(pack), pack),
2316 /* hopefully this is only called on local symbol table entries */
2319 Perl_gp_ref(pTHX_ GP *gp)
2327 /* If the GP they asked for a reference to contains
2328 a method cache entry, clear it first, so that we
2329 don't infect them with our cached entry */
2330 SvREFCNT_dec_NN(gp->gp_cv);
2339 Perl_gp_free(pTHX_ GV *gv)
2345 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
2347 if (gp->gp_refcnt == 0) {
2348 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2349 "Attempt to free unreferenced glob pointers"
2350 pTHX__FORMAT pTHX__VALUE);
2353 if (gp->gp_refcnt > 1) {
2355 if (gp->gp_egv == gv)
2363 /* Copy and null out all the glob slots, so destructors do not see
2365 HEK * const file_hek = gp->gp_file_hek;
2366 SV * const sv = gp->gp_sv;
2367 AV * const av = gp->gp_av;
2368 HV * const hv = gp->gp_hv;
2369 IO * const io = gp->gp_io;
2370 CV * const cv = gp->gp_cv;
2371 CV * const form = gp->gp_form;
2373 gp->gp_file_hek = NULL;
2382 unshare_hek(file_hek);
2386 /* FIXME - another reference loop GV -> symtab -> GV ?
2387 Somehow gp->gp_hv can end up pointing at freed garbage. */
2388 if (hv && SvTYPE(hv) == SVt_PVHV) {
2389 const HEK *hvname_hek = HvNAME_HEK(hv);
2390 DEBUG_o(Perl_deb(aTHX_ "gp_free clearing PL_stashcache for '%"HEKf"'\n", hvname_hek));
2391 if (PL_stashcache && hvname_hek)
2392 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
2399 /* Possibly reallocated by a destructor */
2402 if (!gp->gp_file_hek
2408 && !gp->gp_form) break;
2410 if (--attempts == 0) {
2412 "panic: gp_free failed to free glob pointer - "
2413 "something is repeatedly re-creating entries"
2418 /* Possibly incremented by a destructor doing glob assignment */
2419 if (gp->gp_refcnt > 1) goto borrowed;
2425 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2427 AMT * const amtp = (AMT*)mg->mg_ptr;
2428 PERL_UNUSED_ARG(sv);
2430 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2432 if (amtp && AMT_AMAGIC(amtp)) {
2434 for (i = 1; i < NofAMmeth; i++) {
2435 CV * const cv = amtp->table[i];
2437 SvREFCNT_dec_NN(MUTABLE_SV(cv));
2438 amtp->table[i] = NULL;
2445 /* Updates and caches the CV's */
2447 * 1 on success and there is some overload
2448 * 0 if there is no overload
2449 * -1 if some error occurred and it couldn't croak
2453 Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
2456 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
2458 const struct mro_meta* stash_meta = HvMROMETA(stash);
2461 PERL_ARGS_ASSERT_GV_AMUPDATE;
2463 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
2465 const AMT * const amtp = (AMT*)mg->mg_ptr;
2466 if (amtp->was_ok_sub == newgen) {
2467 return AMT_AMAGIC(amtp) ? 1 : 0;
2469 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
2472 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
2475 amt.was_ok_sub = newgen;
2476 amt.fallback = AMGfallNO;
2483 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
2485 /* Try to find via inheritance. */
2486 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
2487 SV * const sv = gv ? GvSV(gv) : NULL;
2492 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
2495 #ifdef PERL_DONT_CREATE_GVSV
2497 NOOP; /* Equivalent to !SvTRUE and !SvOK */
2500 else if (SvTRUE(sv))
2501 /* don't need to set overloading here because fallback => 1
2502 * is the default setting for classes without overloading */
2503 amt.fallback=AMGfallYES;
2504 else if (SvOK(sv)) {
2505 amt.fallback=AMGfallNEVER;
2512 for (i = 1; i < NofAMmeth; i++) {
2513 const char * const cooky = PL_AMG_names[i];
2514 /* Human-readable form, for debugging: */
2515 const char * const cp = AMG_id2name(i);
2516 const STRLEN l = PL_AMG_namelens[i];
2518 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
2519 cp, HvNAME_get(stash)) );
2520 /* don't fill the cache while looking up!
2521 Creation of inheritance stubs in intermediate packages may
2522 conflict with the logic of runtime method substitution.
2523 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2524 then we could have created stubs for "(+0" in A and C too.
2525 But if B overloads "bool", we may want to use it for
2526 numifying instead of C's "+0". */
2527 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
2529 if (gv && (cv = GvCV(gv))) {
2530 if(GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")){
2531 const char * const hvname = HvNAME_get(GvSTASH(CvGV(cv)));
2532 if (hvname && HEK_LEN(HvNAME_HEK(GvSTASH(CvGV(cv)))) == 8
2533 && strEQ(hvname, "overload")) {
2534 /* This is a hack to support autoloading..., while
2535 knowing *which* methods were declared as overloaded. */
2536 /* GvSV contains the name of the method. */
2538 SV *gvsv = GvSV(gv);
2540 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2541 "\" for overloaded \"%s\" in package \"%.256s\"\n",
2542 (void*)GvSV(gv), cp, HvNAME(stash)) );
2543 if (!gvsv || !SvPOK(gvsv)
2544 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
2546 /* Can be an import stub (created by "can"). */
2551 const SV * const name = (gvsv && SvPOK(gvsv))
2553 : newSVpvs_flags("???", SVs_TEMP);
2554 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
2555 Perl_croak(aTHX_ "%s method \"%"SVf256
2556 "\" overloading \"%s\" "\
2557 "in package \"%"HEKf256"\"",
2558 (GvCVGEN(gv) ? "Stub found while resolving"
2566 cv = GvCV(gv = ngv);
2569 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
2570 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
2571 GvNAME(CvGV(cv))) );
2573 } else if (gv) { /* Autoloaded... */
2574 cv = MUTABLE_CV(gv);
2577 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
2580 AMT_AMAGIC_on(&amt);
2581 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
2582 (char*)&amt, sizeof(AMT));
2586 /* Here we have no table: */
2588 AMT_AMAGIC_off(&amt);
2589 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
2590 (char*)&amt, sizeof(AMTS));
2596 Perl_gv_handler(pTHX_ HV *stash, I32 id)
2602 struct mro_meta* stash_meta;
2604 if (!stash || !HvNAME_get(stash))
2607 stash_meta = HvMROMETA(stash);
2608 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
2610 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
2613 if (Gv_AMupdate(stash, 0) == -1)
2615 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
2618 amtp = (AMT*)mg->mg_ptr;
2619 if ( amtp->was_ok_sub != newgen )
2621 if (AMT_AMAGIC(amtp)) {
2622 CV * const ret = amtp->table[id];
2623 if (ret && isGV(ret)) { /* Autoloading stab */
2624 /* Passing it through may have resulted in a warning
2625 "Inherited AUTOLOAD for a non-method deprecated", since
2626 our caller is going through a function call, not a method call.
2627 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
2628 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
2640 /* Implement tryAMAGICun_MG macro.
2641 Do get magic, then see if the stack arg is overloaded and if so call it.
2643 AMGf_set return the arg using SETs rather than assigning to
2645 AMGf_numeric apply sv_2num to the stack arg.
2649 Perl_try_amagic_un(pTHX_ int method, int flags) {
2653 SV* const arg = TOPs;
2657 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2658 AMGf_noright | AMGf_unary))) {
2659 if (flags & AMGf_set) {
2664 if (SvPADMY(TARG)) {
2665 sv_setsv(TARG, tmpsv);
2675 if ((flags & AMGf_numeric) && SvROK(arg))
2681 /* Implement tryAMAGICbin_MG macro.
2682 Do get magic, then see if the two stack args are overloaded and if so
2685 AMGf_set return the arg using SETs rather than assigning to
2687 AMGf_assign op may be called as mutator (eg +=)
2688 AMGf_numeric apply sv_2num to the stack arg.
2692 Perl_try_amagic_bin(pTHX_ int method, int flags) {
2695 SV* const left = TOPm1s;
2696 SV* const right = TOPs;
2702 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2703 SV * const tmpsv = amagic_call(left, right, method,
2704 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2706 if (flags & AMGf_set) {
2713 if (opASSIGN || SvPADMY(TARG)) {
2714 sv_setsv(TARG, tmpsv);
2724 if(left==right && SvGMAGICAL(left)) {
2725 SV * const left = sv_newmortal();
2727 /* Print the uninitialized warning now, so it includes the vari-
2730 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2731 sv_setsv_flags(left, &PL_sv_no, 0);
2733 else sv_setsv_flags(left, right, 0);
2736 if (flags & AMGf_numeric) {
2738 *(sp-1) = sv_2num(TOPm1s);
2740 *sp = sv_2num(right);
2746 Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2749 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2751 while (SvAMAGIC(ref) &&
2752 (tmpsv = amagic_call(ref, &PL_sv_undef, method,
2753 AMGf_noright | AMGf_unary))) {
2755 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2756 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2757 /* Bail out if it returns us the same reference. */
2762 return tmpsv ? tmpsv : ref;
2766 Perl_amagic_is_enabled(pTHX_ int method)
2768 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2770 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2772 if ( !lex_mask || !SvOK(lex_mask) )
2773 /* overloading lexically disabled */
2775 else if ( lex_mask && SvPOK(lex_mask) ) {
2776 /* we have an entry in the hints hash, check if method has been
2777 * masked by overloading.pm */
2779 const int offset = method / 8;
2780 const int bit = method % 8;
2781 char *pv = SvPV(lex_mask, len);
2783 /* Bit set, so this overloading operator is disabled */
2784 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2791 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
2796 CV **cvp=NULL, **ocvp=NULL;
2797 AMT *amtp=NULL, *oamtp=NULL;
2798 int off = 0, off1, lr = 0, notfound = 0;
2799 int postpr = 0, force_cpy = 0;
2800 int assign = AMGf_assign & flags;
2801 const int assignshift = assign ? 1 : 0;
2802 int use_default_op = 0;
2803 int force_scalar = 0;
2809 PERL_ARGS_ASSERT_AMAGIC_CALL;
2811 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
2812 if (!amagic_is_enabled(method)) return NULL;
2815 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
2816 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
2817 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
2818 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
2819 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
2821 && ((cv = cvp[off=method+assignshift])
2822 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2828 cv = cvp[off=method])))) {
2829 lr = -1; /* Call method for left argument */
2831 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2834 /* look for substituted methods */
2835 /* In all the covered cases we should be called with assign==0. */
2839 if ((cv = cvp[off=add_ass_amg])
2840 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
2841 right = &PL_sv_yes; lr = -1; assign = 1;
2846 if ((cv = cvp[off = subtr_ass_amg])
2847 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
2848 right = &PL_sv_yes; lr = -1; assign = 1;
2852 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
2855 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
2858 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
2861 (void)((cv = cvp[off=bool__amg])
2862 || (cv = cvp[off=numer_amg])
2863 || (cv = cvp[off=string_amg]));
2870 * SV* ref causes confusion with the interpreter variable of
2873 SV* const tmpRef=SvRV(left);
2874 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
2876 * Just to be extra cautious. Maybe in some
2877 * additional cases sv_setsv is safe, too.
2879 SV* const newref = newSVsv(tmpRef);
2880 SvOBJECT_on(newref);
2881 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
2882 delegate to the stash. */
2883 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
2889 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
2890 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
2891 SV* const nullsv=sv_2mortal(newSViv(0));
2893 SV* const lessp = amagic_call(left,nullsv,
2894 lt_amg,AMGf_noright);
2895 logic = SvTRUE(lessp);
2897 SV* const lessp = amagic_call(left,nullsv,
2898 ncmp_amg,AMGf_noright);
2899 logic = (SvNV(lessp) < 0);
2902 if (off==subtr_amg) {
2913 if ((cv = cvp[off=subtr_amg])) {
2915 left = sv_2mortal(newSViv(0));
2920 case iter_amg: /* XXXX Eventually should do to_gv. */
2921 case ftest_amg: /* XXXX Eventually should do to_gv. */
2924 return NULL; /* Delegate operation to standard mechanisms. */
2932 return left; /* Delegate operation to standard mechanisms. */
2937 if (!cv) goto not_found;
2938 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
2939 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
2940 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
2941 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
2942 ? (amtp = (AMT*)mg->mg_ptr)->table
2944 && (cv = cvp[off=method])) { /* Method for right
2947 } else if (((cvp && amtp->fallback > AMGfallNEVER)
2948 || (ocvp && oamtp->fallback > AMGfallNEVER))
2949 && !(flags & AMGf_unary)) {
2950 /* We look for substitution for
2951 * comparison operations and
2953 if (method==concat_amg || method==concat_ass_amg
2954 || method==repeat_amg || method==repeat_ass_amg) {
2955 return NULL; /* Delegate operation to string conversion */
2977 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
2981 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
2991 not_found: /* No method found, either report or croak */
2999 return left; /* Delegate operation to standard mechanisms. */
3002 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3003 notfound = 1; lr = -1;
3004 } else if (cvp && (cv=cvp[nomethod_amg])) {
3005 notfound = 1; lr = 1;
3006 } else if ((use_default_op =
3007 (!ocvp || oamtp->fallback >= AMGfallYES)
3008 && (!cvp || amtp->fallback >= AMGfallYES))
3010 /* Skip generating the "no method found" message. */
3014 if (off==-1) off=method;
3015 msg = sv_2mortal(Perl_newSVpvf(aTHX_
3016 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
3017 AMG_id2name(method + assignshift),
3018 (flags & AMGf_unary ? " " : "\n\tleft "),
3020 "in overloaded package ":
3021 "has no overloaded magic",
3023 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3026 ",\n\tright argument in overloaded package ":
3029 : ",\n\tright argument has no overloaded magic"),
3031 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3032 SVfARG(&PL_sv_no)));
3033 if (use_default_op) {
3034 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
3036 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
3040 force_cpy = force_cpy || assign;
3045 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3046 * operation. we need this to return a value, so that it can be assigned
3047 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3048 * increment or decrement was itself called in void context */
3054 if (off == subtr_amg)
3057 /* in these cases, we're calling an assignment variant of an operator
3058 * (+= rather than +, for instance). regardless of whether it's a
3059 * fallback or not, it always has to return a value, which will be
3060 * assigned to the proper variable later */
3077 /* the copy constructor always needs to return a value */
3081 /* because of the way these are implemented (they don't perform the
3082 * dereferencing themselves, they return a reference that perl then
3083 * dereferences later), they always have to be in scalar context */
3091 /* these don't have an op of their own; they're triggered by their parent
3092 * op, so the context there isn't meaningful ('$a and foo()' in void
3093 * context still needs to pass scalar context on to $a's bool overload) */
3103 DEBUG_o(Perl_deb(aTHX_
3104 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
3106 method+assignshift==off? "" :
3108 method+assignshift==off? "" :
3109 AMG_id2name(method+assignshift),
3110 method+assignshift==off? "" : "\")",
3111 flags & AMGf_unary? "" :
3112 lr==1 ? " for right argument": " for left argument",
3113 flags & AMGf_unary? " for argument" : "",
3114 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
3115 fl? ",\n\tassignment variant used": "") );
3118 /* Since we use shallow copy during assignment, we need
3119 * to dublicate the contents, probably calling user-supplied
3120 * version of copy operator
3122 /* We need to copy in following cases:
3123 * a) Assignment form was called.
3124 * assignshift==1, assign==T, method + 1 == off
3125 * b) Increment or decrement, called directly.
3126 * assignshift==0, assign==0, method + 0 == off
3127 * c) Increment or decrement, translated to assignment add/subtr.
3128 * assignshift==0, assign==T,
3130 * d) Increment or decrement, translated to nomethod.
3131 * assignshift==0, assign==0,
3133 * e) Assignment form translated to nomethod.
3134 * assignshift==1, assign==T, method + 1 != off
3137 /* off is method, method+assignshift, or a result of opcode substitution.
3138 * In the latter case assignshift==0, so only notfound case is important.
3140 if ( (lr == -1) && ( ( (method + assignshift == off)
3141 && (assign || (method == inc_amg) || (method == dec_amg)))
3144 /* newSVsv does not behave as advertised, so we copy missing
3145 * information by hand */
3146 SV *tmpRef = SvRV(left);
3148 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
3149 SvRV_set(left, rv_copy);
3151 SvREFCNT_dec_NN(tmpRef);
3159 const bool oldcatch = CATCH_GET;
3161 int gimme = force_scalar ? G_SCALAR : GIMME_V;
3164 Zero(&myop, 1, BINOP);
3165 myop.op_last = (OP *) &myop;
3166 myop.op_next = NULL;
3167 myop.op_flags = OPf_STACKED;
3171 myop.op_flags |= OPf_WANT_VOID;
3174 if (flags & AMGf_want_list) {
3175 myop.op_flags |= OPf_WANT_LIST;
3180 myop.op_flags |= OPf_WANT_SCALAR;
3184 PUSHSTACKi(PERLSI_OVERLOAD);
3187 PL_op = (OP *) &myop;
3188 if (PERLDB_SUB && PL_curstash != PL_debstash)
3189 PL_op->op_private |= OPpENTERSUB_DB;
3191 Perl_pp_pushmark(aTHX);
3193 EXTEND(SP, notfound + 5);
3194 PUSHs(lr>0? right: left);
3195 PUSHs(lr>0? left: right);
3196 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
3198 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3199 AMG_id2namelen(method + assignshift), SVs_TEMP));
3201 PUSHs(MUTABLE_SV(cv));
3205 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
3209 nret = SP - (PL_stack_base + oldmark);
3213 /* returning NULL has another meaning, and we check the context
3214 * at the call site too, so this can be differentiated from the
3217 SP = PL_stack_base + oldmark;
3220 if (flags & AMGf_want_list) {
3221 res = sv_2mortal((SV *)newAV());
3222 av_extend((AV *)res, nret);
3224 av_store((AV *)res, nret, POPs);
3236 CATCH_SET(oldcatch);
3243 ans=SvIV(res)<=0; break;
3246 ans=SvIV(res)<0; break;
3249 ans=SvIV(res)>=0; break;
3252 ans=SvIV(res)>0; break;
3255 ans=SvIV(res)==0; break;
3258 ans=SvIV(res)!=0; break;
3261 SvSetSV(left,res); return left;
3263 ans=!SvTRUE(res); break;
3268 } else if (method==copy_amg) {
3270 Perl_croak(aTHX_ "Copy method did not return a reference");
3272 return SvREFCNT_inc(SvRV(res));
3280 Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3285 PERL_ARGS_ASSERT_GV_NAME_SET;
3288 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3290 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3291 unshare_hek(GvNAME_HEK(gv));
3294 PERL_HASH(hash, name, len);
3295 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
3299 =for apidoc gv_try_downgrade
3301 If the typeglob C<gv> can be expressed more succinctly, by having
3302 something other than a real GV in its place in the stash, replace it
3303 with the optimised form. Basic requirements for this are that C<gv>
3304 is a real typeglob, is sufficiently ordinary, and is only referenced
3305 from its package. This function is meant to be used when a GV has been
3306 looked up in part to see what was there, causing upgrading, but based
3307 on what was found it turns out that the real GV isn't required after all.
3309 If C<gv> is a completely empty typeglob, it is deleted from the stash.
3311 If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3312 sub, the typeglob is replaced with a scalar-reference placeholder that
3313 more compactly represents the same thing.
3319 Perl_gv_try_downgrade(pTHX_ GV *gv)
3325 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
3327 /* XXX Why and where does this leave dangling pointers during global
3329 if (PL_phase == PERL_PHASE_DESTRUCT) return;
3331 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
3332 !SvOBJECT(gv) && !SvREADONLY(gv) &&
3333 isGV_with_GP(gv) && GvGP(gv) &&
3334 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
3335 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
3336 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
3338 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3340 if (SvMAGICAL(gv)) {
3342 /* only backref magic is allowed */
3343 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3345 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3346 if (mg->mg_type != PERL_MAGIC_backref)
3352 HEK *gvnhek = GvNAME_HEK(gv);
3353 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
3354 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 &&
3355 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
3356 CvSTASH(cv) == stash && CvGV(cv) == gv &&
3357 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3358 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3359 (namehek = GvNAME_HEK(gv)) &&
3360 (gvp = hv_fetchhek(stash, namehek, 0)) &&
3362 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
3363 const bool imported = !!GvIMPORTED_CV(gv);
3367 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
3368 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3369 STRUCT_OFFSET(XPVIV, xiv_iv));
3370 SvRV_set(gv, value);
3375 Perl_gv_override(pTHX_ const char * const name, const STRLEN len)
3377 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV);
3379 PERL_ARGS_ASSERT_GV_OVERRIDE;
3380 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv;
3381 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE);
3382 gv = gvp ? *gvp : NULL;
3383 if (gv && !isGV(gv)) {
3384 if (!SvPCS_IMPORTED(gv)) return NULL;
3385 gv_init(gv, PL_globalstash, name, len, 0);
3388 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL;
3394 core_xsub(pTHX_ CV* cv)
3397 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3403 * c-indentation-style: bsd
3405 * indent-tabs-mode: nil
3408 * ex: set ts=8 sts=4 sw=4 et: