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 $foo, @foo, %foo.
28 GVs are usually found as values in stashes (symbol table hashes) where
29 Perl stores its global variables.
41 static const char S_autoload[] = "AUTOLOAD";
42 static const STRLEN S_autolen = sizeof(S_autoload)-1;
45 Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
52 SvTYPE((const SV *)gv) != SVt_PVGV
53 && SvTYPE((const SV *)gv) != SVt_PVLV
57 if (type == SVt_PVIO) {
59 * if it walks like a dirhandle, then let's assume that
60 * this is a dirhandle.
62 what = OP_IS_DIRHOP(PL_op->op_type) ?
63 "dirhandle" : "filehandle";
64 } else if (type == SVt_PVHV) {
67 what = type == SVt_PVAV ? "array" : "scalar";
69 /* diag_listed_as: Bad symbol for filehandle */
70 Perl_croak(aTHX_ "Bad symbol for %s", what);
73 if (type == SVt_PVHV) {
74 where = (SV **)&GvHV(gv);
75 } else if (type == SVt_PVAV) {
76 where = (SV **)&GvAV(gv);
77 } else if (type == SVt_PVIO) {
78 where = (SV **)&GvIOp(gv);
85 *where = newSV_type(type);
86 if (type == SVt_PVAV && GvNAMELEN(gv) == 3
87 && strnEQ(GvNAME(gv), "ISA", 3))
88 sv_magic(*where, (SV *)gv, PERL_MAGIC_isa, NULL, 0);
94 Perl_gv_fetchfile(pTHX_ const char *name)
96 PERL_ARGS_ASSERT_GV_FETCHFILE;
97 return gv_fetchfile_flags(name, strlen(name), 0);
101 Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
107 const STRLEN tmplen = namelen + 2;
110 PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS;
111 PERL_UNUSED_ARG(flags);
116 if (tmplen <= sizeof smallbuf)
119 Newx(tmpbuf, tmplen, char);
120 /* This is where the debugger's %{"::_<$filename"} hash is created */
123 memcpy(tmpbuf + 2, name, namelen);
124 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
126 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
127 #ifdef PERL_DONT_CREATE_GVSV
128 GvSV(gv) = newSVpvn(name, namelen);
130 sv_setpvn(GvSV(gv), name, namelen);
133 if ((PERLDB_LINE || PERLDB_SAVESRC) && !GvAV(gv))
134 hv_magic(GvHVn(gv), GvAVn(gv), PERL_MAGIC_dbfile);
135 if (tmpbuf != smallbuf)
141 =for apidoc gv_const_sv
143 If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
144 inlining, or C<gv> is a placeholder reference that would be promoted to such
145 a typeglob, then returns the value returned by the sub. Otherwise, returns
152 Perl_gv_const_sv(pTHX_ GV *gv)
154 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)
333 const U32 old_type = SvTYPE(gv);
334 const bool doproto = old_type > SVt_NULL;
335 char * const proto = (doproto && SvPOK(gv))
336 ? ((void)(SvIsCOW(gv) && (sv_force_normal((SV *)gv), 0)), SvPVX(gv))
338 const STRLEN protolen = proto ? SvCUR(gv) : 0;
339 const U32 proto_utf8 = proto ? SvUTF8(gv) : 0;
340 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
341 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
343 PERL_ARGS_ASSERT_GV_INIT_PVN;
344 assert (!(proto && has_constant));
347 /* The constant has to be a simple scalar type. */
348 switch (SvTYPE(has_constant)) {
353 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
354 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_x(
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,
1126 is_utf8 | (flags & GV_SUPER))))
1130 if (!(CvROOT(cv) || CvXSUB(cv)))
1134 * Inheriting AUTOLOAD for non-methods works ... for now.
1137 !(flags & GV_AUTOLOAD_ISMETHOD)
1138 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
1140 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
1141 "Use of inherited AUTOLOAD for non-method %"SVf
1142 "::%"UTF8f"() is deprecated",
1144 UTF8fARG(is_utf8, len, name));
1147 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1148 * and split that value on the last '::', pass along the same data
1149 * via the SvPVX field in the CV, and the stash in CvSTASH.
1151 * Due to an unfortunate accident of history, the SvPVX field
1152 * serves two purposes. It is also used for the subroutine's pro-
1153 * type. Since SvPVX has been documented as returning the sub name
1154 * for a long time, but not as returning the prototype, we have
1155 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1158 * We put the prototype in the same allocated buffer, but after
1159 * the sub name. The SvPOK flag indicates the presence of a proto-
1160 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1161 * If both flags are on, then SvLEN is used to indicate the end of
1162 * the prototype (artificially lower than what is actually allo-
1163 * cated), at the risk of having to reallocate a few bytes unneces-
1164 * sarily--but that should happen very rarely, if ever.
1166 * We use SvUTF8 for both prototypes and sub names, so if one is
1167 * UTF8, the other must be upgraded.
1169 CvSTASH_set(cv, stash);
1170 if (SvPOK(cv)) { /* Ouch! */
1171 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
1173 const char *proto = CvPROTO(cv);
1176 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1177 ulen = SvCUR(tmpsv);
1178 SvCUR(tmpsv)++; /* include null in string */
1180 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1182 SvTEMP_on(tmpsv); /* Allow theft */
1183 sv_setsv_nomg((SV *)cv, tmpsv);
1185 SvREFCNT_dec_NN(tmpsv);
1186 SvLEN(cv) = SvCUR(cv) + 1;
1190 sv_setpvn((SV *)cv, name, len);
1194 else SvUTF8_off(cv);
1200 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1201 * The subroutine's original name may not be "AUTOLOAD", so we don't
1202 * use that, but for lack of anything better we will use the sub's
1203 * original package to look up $AUTOLOAD.
1205 varstash = GvSTASH(CvGV(cv));
1206 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
1210 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
1211 #ifdef PERL_DONT_CREATE_GVSV
1212 GvSV(vargv) = newSV(0);
1216 varsv = GvSVn(vargv);
1217 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1218 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
1219 sv_setsv(varsv, packname);
1220 sv_catpvs(varsv, "::");
1221 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1222 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
1225 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
1233 /* require_tie_mod() internal routine for requiring a module
1234 * that implements the logic of automatic ties like %! and %-
1236 * The "gv" parameter should be the glob.
1237 * "varpv" holds the name of the var, used for error messages.
1238 * "namesv" holds the module name. Its refcount will be decremented.
1239 * "methpv" holds the method name to test for to check that things
1240 * are working reasonably close to as expected.
1241 * "flags": if flag & 1 then save the scalar before loading.
1242 * For the protection of $! to work (it is set by this routine)
1243 * the sv slot must already be magicalized.
1246 S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
1249 HV* stash = gv_stashsv(namesv, 0);
1251 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1253 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
1254 SV *module = newSVsv(namesv);
1255 char varname = *varpv; /* varpv might be clobbered by load_module,
1256 so save it. For the moment it's always
1258 const char type = varname == '[' ? '$' : '%';
1266 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
1267 assert(sp == PL_stack_sp);
1268 stash = gv_stashsv(namesv, 0);
1270 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1271 type, varname, SVfARG(namesv));
1272 else if (!gv_fetchmethod(stash, methpv))
1273 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1274 type, varname, SVfARG(namesv), methpv);
1277 else SvREFCNT_dec_NN(namesv);
1282 =for apidoc gv_stashpv
1284 Returns a pointer to the stash for a specified package. Uses C<strlen> to
1285 determine the length of C<name>, then calls C<gv_stashpvn()>.
1291 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
1293 PERL_ARGS_ASSERT_GV_STASHPV;
1294 return gv_stashpvn(name, strlen(name), create);
1298 =for apidoc gv_stashpvn
1300 Returns a pointer to the stash for a specified package. The C<namelen>
1301 parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1302 to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1303 created if it does not already exist. If the package does not exist and
1304 C<flags> is 0 (or any other setting that does not create packages) then NULL
1307 Flags may be one of:
1316 The most important of which are probably GV_ADD and SVf_UTF8.
1322 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
1328 U32 tmplen = namelen + 2;
1330 PERL_ARGS_ASSERT_GV_STASHPVN;
1332 if (tmplen <= sizeof smallbuf)
1335 Newx(tmpbuf, tmplen, char);
1336 Copy(name, tmpbuf, namelen, char);
1337 tmpbuf[namelen] = ':';
1338 tmpbuf[namelen+1] = ':';
1339 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
1340 if (tmpbuf != smallbuf)
1344 stash = GvHV(tmpgv);
1345 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
1347 if (!HvNAME_get(stash)) {
1348 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1350 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1351 /* If the containing stash has multiple effective
1352 names, see that this one gets them, too. */
1353 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1354 mro_package_moved(stash, NULL, tmpgv, 1);
1360 =for apidoc gv_stashsv
1362 Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
1368 Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
1371 const char * const ptr = SvPV_const(sv,len);
1373 PERL_ARGS_ASSERT_GV_STASHSV;
1375 return gv_stashpvn(ptr, len, flags | SvUTF8(sv));
1380 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
1381 PERL_ARGS_ASSERT_GV_FETCHPV;
1382 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
1386 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
1388 const char * const nambeg =
1389 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
1390 PERL_ARGS_ASSERT_GV_FETCHSV;
1391 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1394 PERL_STATIC_INLINE void
1395 S_gv_magicalize_isa(pTHX_ GV *gv)
1399 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1403 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1407 /* This function grabs name and tries to split a stash and glob
1408 * from its contents. TODO better description, comments
1410 * If the function returns TRUE and 'name == name_end', then
1411 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1413 PERL_STATIC_INLINE bool
1414 S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1415 STRLEN *len, const char *nambeg, STRLEN full_len,
1416 const U32 is_utf8, const I32 add)
1418 const char *name_cursor;
1419 const char *const name_end = nambeg + full_len;
1420 const char *const name_em1 = name_end - 1;
1422 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1424 if (full_len > 2 && **name == '*' && isIDFIRST_lazy_if(*name + 1, is_utf8)) {
1425 /* accidental stringify on a GV? */
1429 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1430 if (name_cursor < name_em1 &&
1431 ((*name_cursor == ':' && name_cursor[1] == ':')
1432 || *name_cursor == '\''))
1435 *stash = PL_defstash;
1436 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1439 *len = name_cursor - *name;
1440 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1443 if (*name_cursor == ':') {
1449 Newx(tmpbuf, *len+2, char);
1450 Copy(*name, tmpbuf, *len, char);
1451 tmpbuf[(*len)++] = ':';
1452 tmpbuf[(*len)++] = ':';
1455 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add);
1456 *gv = gvp ? *gvp : NULL;
1457 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1458 if (SvTYPE(*gv) != SVt_PVGV)
1459 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1465 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1468 if (!(*stash = GvHV(*gv))) {
1469 *stash = GvHV(*gv) = newHV();
1470 if (!HvNAME_get(*stash)) {
1471 if (GvSTASH(*gv) == PL_defstash && *len == 6
1472 && strnEQ(*name, "CORE", 4))
1473 hv_name_set(*stash, "CORE", 4, 0);
1476 *stash, nambeg, name_cursor-nambeg, is_utf8
1478 /* If the containing stash has multiple effective
1479 names, see that this one gets them, too. */
1480 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1481 mro_package_moved(*stash, NULL, *gv, 1);
1484 else if (!HvNAME_get(*stash))
1485 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1488 if (*name_cursor == ':')
1490 *name = name_cursor+1;
1491 if (*name == name_end) {
1493 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1498 *len = name_cursor - *name;
1502 /* Checks if an unqualified name is in the main stash */
1503 PERL_STATIC_INLINE bool
1504 S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
1506 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
1508 /* If it's an alphanumeric variable */
1509 if ( len && isIDFIRST_lazy_if(name, is_utf8) ) {
1510 /* Some "normal" variables are always in main::,
1511 * like INC or STDOUT.
1519 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1520 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1521 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
1525 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1530 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1531 && name[3] == 'I' && name[4] == 'N')
1535 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1536 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1537 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
1541 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1542 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1548 /* *{""}, or a special variable like $@ */
1556 /* This function is called if parse_gv_stash_name() failed to
1557 * find a stash, or if GV_NOTQUAL or an empty name was passed
1558 * to gv_fetchpvn_flags.
1560 * It returns FALSE if the default stash can't be found nor created,
1561 * which might happen during global destruction.
1563 PERL_STATIC_INLINE bool
1564 S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1565 const U32 is_utf8, const I32 add,
1566 const svtype sv_type)
1568 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1570 /* No stash in name, so see how we can default */
1572 if ( gv_is_in_main(name, len, is_utf8) ) {
1573 *stash = PL_defstash;
1576 if (IN_PERL_COMPILETIME) {
1577 *stash = PL_curstash;
1578 if (add && (PL_hints & HINT_STRICT_VARS) &&
1579 sv_type != SVt_PVCV &&
1580 sv_type != SVt_PVGV &&
1581 sv_type != SVt_PVFM &&
1582 sv_type != SVt_PVIO &&
1583 !(len == 1 && sv_type == SVt_PV &&
1584 (*name == 'a' || *name == 'b')) )
1586 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0);
1587 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1588 SvTYPE(*gvp) != SVt_PVGV)
1592 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1593 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1594 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1596 /* diag_listed_as: Variable "%s" is not imported%s */
1598 aTHX_ packWARN(WARN_MISC),
1599 "Variable \"%c%"UTF8f"\" is not imported",
1600 sv_type == SVt_PVAV ? '@' :
1601 sv_type == SVt_PVHV ? '%' : '$',
1602 UTF8fARG(is_utf8, len, name));
1605 aTHX_ packWARN(WARN_MISC),
1606 "\t(Did you mean &%"UTF8f" instead?)\n",
1607 UTF8fARG(is_utf8, len, name)
1614 /* Use the current op's stash */
1615 *stash = CopSTASH(PL_curcop);
1620 if (add && !PL_in_clean_all) {
1621 SV * const err = Perl_mess(aTHX_
1622 "Global symbol \"%s%"UTF8f
1623 "\" requires explicit package name",
1624 (sv_type == SVt_PV ? "$"
1625 : sv_type == SVt_PVAV ? "@"
1626 : sv_type == SVt_PVHV ? "%"
1627 : ""), UTF8fARG(is_utf8, len, name));
1632 /* To maintain the output of errors after the strict exception
1633 * above, and to keep compat with older releases, rather than
1634 * placing the variables in the pad, we place
1635 * them in the <none>:: stash.
1637 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1639 /* symbol table under destruction */
1648 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1654 /* gv_magicalize() is called by gv_fetchpvn_flags when creating
1656 * Note that it does not insert the GV into the stash prior to
1657 * magicalization, which some variables require need in order
1658 * to work (like $[, %+, %-, %!), so callers must take care of
1661 * The return value has a specific meaning for gv_fetchpvn_flags:
1662 * If it returns true, and the gv is empty, it indicates that its
1663 * refcount should be decreased.
1665 PERL_STATIC_INLINE bool
1666 S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
1667 bool addmg, const svtype sv_type)
1671 PERL_ARGS_ASSERT_GV_MAGICALIZE;
1673 if (stash != PL_defstash) { /* not the main stash */
1674 /* We only have to check for a few names here: a, b, EXPORT, ISA
1675 and VERSION. All the others apply only to the main stash or to
1676 CORE (which is checked right after this). */
1678 const char * const name2 = name + 1;
1681 if (strnEQ(name2, "XPORT", 5))
1685 if (strEQ(name2, "SA"))
1686 gv_magicalize_isa(gv);
1689 if (strEQ(name2, "ERSION"))
1694 if (len == 1 && sv_type == SVt_PV)
1703 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1704 /* Avoid null warning: */
1705 const char * const stashname = HvNAME(stash); assert(stashname);
1706 if (strnEQ(stashname, "CORE", 4))
1707 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
1714 /* Nothing else to do.
1715 The compiler will probably turn the switch statement into a
1716 branch table. Make sure we avoid even that small overhead for
1717 the common case of lower case variable names. (On EBCDIC
1718 platforms, we can't just do:
1719 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1720 because cases like '\027' in the switch statement below are
1721 C1 (non-ASCII) controls on those platforms, so the remapping
1722 would make them larger than 'V')
1727 const char * const name2 = name + 1;
1730 if (strEQ(name2, "RGV")) {
1731 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1733 else if (strEQ(name2, "RGVOUT")) {
1738 if (strnEQ(name2, "XPORT", 5))
1742 if (strEQ(name2, "SA")) {
1743 gv_magicalize_isa(gv);
1747 if (strEQ(name2, "IG")) {
1750 if (!PL_psig_name) {
1751 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
1752 Newxz(PL_psig_pend, SIG_SIZE, int);
1753 PL_psig_ptr = PL_psig_name + SIG_SIZE;
1755 /* I think that the only way to get here is to re-use an
1756 embedded perl interpreter, where the previous
1757 use didn't clean up fully because
1758 PL_perl_destruct_level was 0. I'm not sure that we
1759 "support" that, in that I suspect in that scenario
1760 there are sufficient other garbage values left in the
1761 interpreter structure that something else will crash
1762 before we get here. I suspect that this is one of
1763 those "doctor, it hurts when I do this" bugs. */
1764 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
1765 Zero(PL_psig_pend, SIG_SIZE, int);
1769 hv_magic(hv, NULL, PERL_MAGIC_sig);
1770 for (i = 1; i < SIG_SIZE; i++) {
1771 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1773 sv_setsv(*init, &PL_sv_undef);
1778 if (strEQ(name2, "ERSION"))
1781 case '\003': /* $^CHILD_ERROR_NATIVE */
1782 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1785 case '\005': /* $^ENCODING */
1786 if (strEQ(name2, "NCODING"))
1789 case '\007': /* $^GLOBAL_PHASE */
1790 if (strEQ(name2, "LOBAL_PHASE"))
1793 case '\014': /* $^LAST_FH */
1794 if (strEQ(name2, "AST_FH"))
1797 case '\015': /* $^MATCH */
1798 if (strEQ(name2, "ATCH")) {
1799 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1803 case '\017': /* $^OPEN */
1804 if (strEQ(name2, "PEN"))
1807 case '\020': /* $^PREMATCH $^POSTMATCH */
1808 if (strEQ(name2, "REMATCH")) {
1809 paren = RX_BUFF_IDX_CARET_PREMATCH;
1812 if (strEQ(name2, "OSTMATCH")) {
1813 paren = RX_BUFF_IDX_CARET_POSTMATCH;
1817 case '\024': /* ${^TAINT} */
1818 if (strEQ(name2, "AINT"))
1821 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1822 if (strEQ(name2, "NICODE"))
1824 if (strEQ(name2, "TF8LOCALE"))
1826 if (strEQ(name2, "TF8CACHE"))
1829 case '\027': /* $^WARNING_BITS */
1830 if (strEQ(name2, "ARNING_BITS"))
1843 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1845 /* This snippet is taken from is_gv_magical */
1846 const char *end = name + len;
1847 while (--end > name) {
1851 paren = strtoul(name, NULL, 10);
1857 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1858 be case '\0' in this switch statement (ie a default case) */
1861 paren = RX_BUFF_IDX_FULLMATCH;
1864 paren = RX_BUFF_IDX_PREMATCH;
1867 paren = RX_BUFF_IDX_POSTMATCH;
1869 #ifdef PERL_SAWAMPERSAND
1871 sv_type == SVt_PVAV ||
1872 sv_type == SVt_PVHV ||
1873 sv_type == SVt_PVCV ||
1874 sv_type == SVt_PVFM ||
1876 )) { PL_sawampersand |=
1880 ? SAWAMPERSAND_MIDDLE
1881 : SAWAMPERSAND_RIGHT;
1894 paren = *name - '0';
1897 /* Flag the capture variables with a NULL mg_ptr
1898 Use mg_len for the array index to lookup. */
1899 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
1903 sv_setpv(GvSVn(gv),PL_chopset);
1907 #ifdef COMPLEX_STATUS
1908 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1914 /* If %! has been used, automatically load Errno.pm. */
1916 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1918 /* magicalization must be done before require_tie_mod is called */
1919 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1921 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1928 GvMULTI_on(gv); /* no used once warnings here */
1930 AV* const av = GvAVn(gv);
1931 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
1933 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
1934 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
1936 SvREADONLY_on(GvSVn(gv));
1939 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1941 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
1949 if (sv_type == SVt_PV)
1950 /* diag_listed_as: $* is no longer supported */
1951 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1952 "$%c is no longer supported", *name);
1954 case '\010': /* $^H */
1956 HV *const hv = GvHVn(gv);
1957 hv_magic(hv, NULL, PERL_MAGIC_hints);
1961 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
1962 && FEATURE_ARYBASE_IS_ENABLED) {
1963 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
1966 else goto magicalize;
1968 case '\023': /* $^S */
1970 SvREADONLY_on(GvSVn(gv));
1986 case '\001': /* $^A */
1987 case '\003': /* $^C */
1988 case '\004': /* $^D */
1989 case '\005': /* $^E */
1990 case '\006': /* $^F */
1991 case '\011': /* $^I, NOT \t in EBCDIC */
1992 case '\016': /* $^N */
1993 case '\017': /* $^O */
1994 case '\020': /* $^P */
1995 case '\024': /* $^T */
1996 case '\027': /* $^W */
1998 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
2001 case '\014': /* $^L */
2002 sv_setpvs(GvSVn(gv),"\f");
2005 sv_setpvs(GvSVn(gv),"\034");
2009 SV * const sv = GvSV(gv);
2010 if (!sv_derived_from(PL_patchlevel, "version"))
2011 upg_version(PL_patchlevel, TRUE);
2012 GvSV(gv) = vnumify(PL_patchlevel);
2013 SvREADONLY_on(GvSV(gv));
2017 case '\026': /* $^V */
2019 SV * const sv = GvSV(gv);
2020 GvSV(gv) = new_version(PL_patchlevel);
2021 SvREADONLY_on(GvSV(gv));
2027 if (sv_type == SVt_PV)
2035 /* This function is called when the stash already holds the GV of the magic
2036 * variable we're looking for, but we need to check that it has the correct
2037 * kind of magic. For example, if someone first uses $! and then %!, the
2038 * latter would end up here, and we add the Errno tie to the HASH slot of
2041 PERL_STATIC_INLINE void
2042 S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2044 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2046 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2048 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
2049 else if (*name == '-' || *name == '+')
2050 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
2051 } else if (sv_type == SVt_PV) {
2052 if (*name == '*' || *name == '#') {
2053 /* diag_listed_as: $* is no longer supported */
2054 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2056 "$%c is no longer supported", *name);
2059 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2062 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
2064 #ifdef PERL_SAWAMPERSAND
2066 PL_sawampersand |= SAWAMPERSAND_LEFT;
2070 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2074 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2083 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2084 const svtype sv_type)
2087 const char *name = nambeg;
2092 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2093 const I32 no_expand = flags & GV_NOEXPAND;
2094 const I32 add = flags & ~GV_NOADD_MASK;
2095 const U32 is_utf8 = flags & SVf_UTF8;
2096 bool addmg = cBOOL(flags & GV_ADDMG);
2097 const char *const name_end = nambeg + full_len;
2100 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2102 /* If we have GV_NOTQUAL, the caller promised that
2103 * there is no stash, so we can skip the check.
2104 * Similarly if full_len is 0, since then we're
2105 * dealing with something like *{""} or ""->foo()
2107 if ((flags & GV_NOTQUAL) || !full_len) {
2110 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2111 if (name == name_end) return gv;
2117 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2121 /* By this point we should have a stash and a name */
2122 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
2123 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2124 if (addmg) gv = (GV *)newSV(0);
2127 else gv = *gvp, addmg = 0;
2128 /* From this point on, addmg means gv has not been inserted in the
2131 if (SvTYPE(gv) == SVt_PVGV) {
2132 /* The GV already exists, so return it, but check if we need to do
2133 * anything else with it before that.
2136 /* This is the heuristic that handles if a variable triggers the
2137 * 'used only once' warning. If there's already a GV in the stash
2138 * with this name, then we assume that the variable has been used
2139 * before and turn its MULTI flag on.
2140 * It's a heuristic because it can easily be "tricked", like with
2141 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2142 * not warning about $main::foo being used just once
2145 gv_init_svtype(gv, sv_type);
2146 /* You reach this path once the typeglob has already been created,
2147 either by the same or a different sigil. If this path didn't
2148 exist, then (say) referencing $! first, and %! second would
2149 mean that %! was not handled correctly. */
2150 if (len == 1 && stash == PL_defstash) {
2151 maybe_multimagic_gv(gv, name, sv_type);
2153 else if (len == 3 && sv_type == SVt_PVAV
2154 && strnEQ(name, "ISA", 3)
2155 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2156 gv_magicalize_isa(gv);
2159 } else if (no_init) {
2163 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2164 * don't expand it to a glob. This is an optimization so that things
2165 * copying constants over, like Exporter, don't have to be rewritten
2166 * to take into account that you can store more than just globs in
2169 else if (no_expand && SvROK(gv)) {
2174 /* Adding a new symbol.
2175 Unless of course there was already something non-GV here, in which case
2176 we want to behave as if there was always a GV here, containing some sort
2178 Otherwise we run the risk of creating things like GvIO, which can cause
2179 subtle bugs. eg the one that tripped up SQL::Translator */
2181 faking_it = SvOK(gv);
2183 if (add & GV_ADDWARN)
2184 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2185 "Had to create %"UTF8f" unexpectedly",
2186 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2187 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2189 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
2192 /* First, store the gv in the symtab if we're adding magic,
2193 * but only for non-empty GVs
2195 #define GvEMPTY(gv) !(GvAV(gv) || GvHV(gv) || GvIO(gv) \
2196 || GvCV(gv) || (GvSV(gv) && SvOK(GvSV(gv))))
2198 if ( addmg && !GvEMPTY(gv) ) {
2199 (void)hv_store(stash,name,len,(SV *)gv,0);
2202 /* set up magic where warranted */
2203 if ( gv_magicalize(gv, stash, name, len, addmg, sv_type) ) {
2206 if ( GvSV(gv) && SvMAGICAL(GvSV(gv)) ) {
2207 /* The GV was and still is "empty", except that now
2208 * it has the magic flags turned on, so we want it
2209 * stored in the symtab.
2211 (void)hv_store(stash,name,len,(SV *)gv,0);
2214 /* Most likely the temporary GV created above */
2215 SvREFCNT_dec_NN(gv);
2221 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
2226 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
2229 const HV * const hv = GvSTASH(gv);
2231 PERL_ARGS_ASSERT_GV_FULLNAME4;
2233 sv_setpv(sv, prefix ? prefix : "");
2235 if (hv && (name = HvNAME(hv))) {
2236 const STRLEN len = HvNAMELEN(hv);
2237 if (keepmain || strnNE(name, "main", len)) {
2238 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
2242 else sv_catpvs(sv,"__ANON__::");
2243 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
2247 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
2249 const GV * const egv = GvEGVx(gv);
2251 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2253 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
2257 /* recursively scan a stash and any nested stashes looking for entries
2258 * that need the "only used once" warning raised
2262 Perl_gv_check(pTHX_ HV *stash)
2267 PERL_ARGS_ASSERT_GV_CHECK;
2269 if (!HvARRAY(stash))
2272 assert(SvOOK(stash));
2274 for (i = 0; i <= (I32) HvMAX(stash); i++) {
2276 /* mark stash is being scanned, to avoid recursing */
2277 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
2278 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
2281 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
2282 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
2284 if (hv != PL_defstash && hv != stash
2286 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2288 gv_check(hv); /* nested package */
2290 else if ( *HeKEY(entry) != '_'
2291 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
2293 gv = MUTABLE_GV(HeVAL(entry));
2294 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
2297 CopLINE_set(PL_curcop, GvLINE(gv));
2299 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2301 CopFILEGV(PL_curcop)
2302 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2304 Perl_warner(aTHX_ packWARN(WARN_ONCE),
2305 "Name \"%"HEKf"::%"HEKf
2306 "\" used only once: possible typo",
2307 HEKfARG(HvNAME_HEK(stash)),
2308 HEKfARG(GvNAME_HEK(gv)));
2311 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
2316 Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
2319 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
2320 assert(!(flags & ~SVf_UTF8));
2322 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2323 UTF8fARG(flags, strlen(pack), pack),
2328 /* hopefully this is only called on local symbol table entries */
2331 Perl_gp_ref(pTHX_ GP *gp)
2339 /* If the GP they asked for a reference to contains
2340 a method cache entry, clear it first, so that we
2341 don't infect them with our cached entry */
2342 SvREFCNT_dec_NN(gp->gp_cv);
2351 Perl_gp_free(pTHX_ GV *gv)
2357 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
2359 if (gp->gp_refcnt == 0) {
2360 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2361 "Attempt to free unreferenced glob pointers"
2362 pTHX__FORMAT pTHX__VALUE);
2365 if (gp->gp_refcnt > 1) {
2367 if (gp->gp_egv == gv)
2375 /* Copy and null out all the glob slots, so destructors do not see
2377 HEK * const file_hek = gp->gp_file_hek;
2378 SV * const sv = gp->gp_sv;
2379 AV * const av = gp->gp_av;
2380 HV * const hv = gp->gp_hv;
2381 IO * const io = gp->gp_io;
2382 CV * const cv = gp->gp_cv;
2383 CV * const form = gp->gp_form;
2385 gp->gp_file_hek = NULL;
2394 unshare_hek(file_hek);
2398 /* FIXME - another reference loop GV -> symtab -> GV ?
2399 Somehow gp->gp_hv can end up pointing at freed garbage. */
2400 if (hv && SvTYPE(hv) == SVt_PVHV) {
2401 const HEK *hvname_hek = HvNAME_HEK(hv);
2402 DEBUG_o(Perl_deb(aTHX_ "gp_free clearing PL_stashcache for '%"HEKf"'\n", HEKfARG(hvname_hek)));
2403 if (PL_stashcache && hvname_hek)
2404 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
2411 /* Possibly reallocated by a destructor */
2414 if (!gp->gp_file_hek
2420 && !gp->gp_form) break;
2422 if (--attempts == 0) {
2424 "panic: gp_free failed to free glob pointer - "
2425 "something is repeatedly re-creating entries"
2430 /* Possibly incremented by a destructor doing glob assignment */
2431 if (gp->gp_refcnt > 1) goto borrowed;
2437 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2439 AMT * const amtp = (AMT*)mg->mg_ptr;
2440 PERL_UNUSED_ARG(sv);
2442 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2444 if (amtp && AMT_AMAGIC(amtp)) {
2446 for (i = 1; i < NofAMmeth; i++) {
2447 CV * const cv = amtp->table[i];
2449 SvREFCNT_dec_NN(MUTABLE_SV(cv));
2450 amtp->table[i] = NULL;
2457 /* Updates and caches the CV's */
2459 * 1 on success and there is some overload
2460 * 0 if there is no overload
2461 * -1 if some error occurred and it couldn't croak
2465 Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
2468 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
2470 const struct mro_meta* stash_meta = HvMROMETA(stash);
2473 PERL_ARGS_ASSERT_GV_AMUPDATE;
2475 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
2477 const AMT * const amtp = (AMT*)mg->mg_ptr;
2478 if (amtp->was_ok_sub == newgen) {
2479 return AMT_AMAGIC(amtp) ? 1 : 0;
2481 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
2484 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
2487 amt.was_ok_sub = newgen;
2488 amt.fallback = AMGfallNO;
2494 bool deref_seen = 0;
2497 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
2499 /* Try to find via inheritance. */
2500 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
2501 SV * const sv = gv ? GvSV(gv) : NULL;
2506 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
2509 #ifdef PERL_DONT_CREATE_GVSV
2511 NOOP; /* Equivalent to !SvTRUE and !SvOK */
2514 else if (SvTRUE(sv))
2515 /* don't need to set overloading here because fallback => 1
2516 * is the default setting for classes without overloading */
2517 amt.fallback=AMGfallYES;
2518 else if (SvOK(sv)) {
2519 amt.fallback=AMGfallNEVER;
2526 assert(SvOOK(stash));
2527 /* initially assume the worst */
2528 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
2530 for (i = 1; i < NofAMmeth; i++) {
2531 const char * const cooky = PL_AMG_names[i];
2532 /* Human-readable form, for debugging: */
2533 const char * const cp = AMG_id2name(i);
2534 const STRLEN l = PL_AMG_namelens[i];
2536 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
2537 cp, HvNAME_get(stash)) );
2538 /* don't fill the cache while looking up!
2539 Creation of inheritance stubs in intermediate packages may
2540 conflict with the logic of runtime method substitution.
2541 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2542 then we could have created stubs for "(+0" in A and C too.
2543 But if B overloads "bool", we may want to use it for
2544 numifying instead of C's "+0". */
2545 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
2547 if (gv && (cv = GvCV(gv))) {
2548 if(GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")){
2549 const char * const hvname = HvNAME_get(GvSTASH(CvGV(cv)));
2550 if (hvname && HEK_LEN(HvNAME_HEK(GvSTASH(CvGV(cv)))) == 8
2551 && strEQ(hvname, "overload")) {
2552 /* This is a hack to support autoloading..., while
2553 knowing *which* methods were declared as overloaded. */
2554 /* GvSV contains the name of the method. */
2556 SV *gvsv = GvSV(gv);
2558 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2559 "\" for overloaded \"%s\" in package \"%.256s\"\n",
2560 (void*)GvSV(gv), cp, HvNAME(stash)) );
2561 if (!gvsv || !SvPOK(gvsv)
2562 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
2564 /* Can be an import stub (created by "can"). */
2569 const SV * const name = (gvsv && SvPOK(gvsv))
2571 : newSVpvs_flags("???", SVs_TEMP);
2572 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
2573 Perl_croak(aTHX_ "%s method \"%"SVf256
2574 "\" overloading \"%s\" "\
2575 "in package \"%"HEKf256"\"",
2576 (GvCVGEN(gv) ? "Stub found while resolving"
2584 cv = GvCV(gv = ngv);
2587 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
2588 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
2589 GvNAME(CvGV(cv))) );
2591 } else if (gv) { /* Autoloaded... */
2592 cv = MUTABLE_CV(gv);
2595 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
2611 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2612 * NB - aux var invalid here, HvARRAY() could have been
2613 * reallocated since it was assigned to */
2614 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
2617 AMT_AMAGIC_on(&amt);
2618 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
2619 (char*)&amt, sizeof(AMT));
2623 /* Here we have no table: */
2625 AMT_AMAGIC_off(&amt);
2626 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
2627 (char*)&amt, sizeof(AMTS));
2633 Perl_gv_handler(pTHX_ HV *stash, I32 id)
2639 struct mro_meta* stash_meta;
2641 if (!stash || !HvNAME_get(stash))
2644 stash_meta = HvMROMETA(stash);
2645 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
2647 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
2650 if (Gv_AMupdate(stash, 0) == -1)
2652 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
2655 amtp = (AMT*)mg->mg_ptr;
2656 if ( amtp->was_ok_sub != newgen )
2658 if (AMT_AMAGIC(amtp)) {
2659 CV * const ret = amtp->table[id];
2660 if (ret && isGV(ret)) { /* Autoloading stab */
2661 /* Passing it through may have resulted in a warning
2662 "Inherited AUTOLOAD for a non-method deprecated", since
2663 our caller is going through a function call, not a method call.
2664 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
2665 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
2677 /* Implement tryAMAGICun_MG macro.
2678 Do get magic, then see if the stack arg is overloaded and if so call it.
2680 AMGf_set return the arg using SETs rather than assigning to
2682 AMGf_numeric apply sv_2num to the stack arg.
2686 Perl_try_amagic_un(pTHX_ int method, int flags) {
2690 SV* const arg = TOPs;
2694 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2695 AMGf_noright | AMGf_unary))) {
2696 if (flags & AMGf_set) {
2701 if (SvPADMY(TARG)) {
2702 sv_setsv(TARG, tmpsv);
2712 if ((flags & AMGf_numeric) && SvROK(arg))
2718 /* Implement tryAMAGICbin_MG macro.
2719 Do get magic, then see if the two stack args are overloaded and if so
2722 AMGf_set return the arg using SETs rather than assigning to
2724 AMGf_assign op may be called as mutator (eg +=)
2725 AMGf_numeric apply sv_2num to the stack arg.
2729 Perl_try_amagic_bin(pTHX_ int method, int flags) {
2732 SV* const left = TOPm1s;
2733 SV* const right = TOPs;
2739 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2740 SV * const tmpsv = amagic_call(left, right, method,
2741 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2743 if (flags & AMGf_set) {
2750 if (opASSIGN || SvPADMY(TARG)) {
2751 sv_setsv(TARG, tmpsv);
2761 if(left==right && SvGMAGICAL(left)) {
2762 SV * const left = sv_newmortal();
2764 /* Print the uninitialized warning now, so it includes the vari-
2767 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2768 sv_setsv_flags(left, &PL_sv_no, 0);
2770 else sv_setsv_flags(left, right, 0);
2773 if (flags & AMGf_numeric) {
2775 *(sp-1) = sv_2num(TOPm1s);
2777 *sp = sv_2num(right);
2783 Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2787 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2791 /* return quickly if none of the deref ops are overloaded */
2792 stash = SvSTASH(SvRV(ref));
2793 assert(SvOOK(stash));
2794 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
2797 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
2798 AMGf_noright | AMGf_unary))) {
2800 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2801 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2802 /* Bail out if it returns us the same reference. */
2809 return tmpsv ? tmpsv : ref;
2813 Perl_amagic_is_enabled(pTHX_ int method)
2815 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2817 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2819 if ( !lex_mask || !SvOK(lex_mask) )
2820 /* overloading lexically disabled */
2822 else if ( lex_mask && SvPOK(lex_mask) ) {
2823 /* we have an entry in the hints hash, check if method has been
2824 * masked by overloading.pm */
2826 const int offset = method / 8;
2827 const int bit = method % 8;
2828 char *pv = SvPV(lex_mask, len);
2830 /* Bit set, so this overloading operator is disabled */
2831 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2838 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
2843 CV **cvp=NULL, **ocvp=NULL;
2844 AMT *amtp=NULL, *oamtp=NULL;
2845 int off = 0, off1, lr = 0, notfound = 0;
2846 int postpr = 0, force_cpy = 0;
2847 int assign = AMGf_assign & flags;
2848 const int assignshift = assign ? 1 : 0;
2849 int use_default_op = 0;
2850 int force_scalar = 0;
2856 PERL_ARGS_ASSERT_AMAGIC_CALL;
2858 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
2859 if (!amagic_is_enabled(method)) return NULL;
2862 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
2863 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
2864 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
2865 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
2866 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
2868 && ((cv = cvp[off=method+assignshift])
2869 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2875 cv = cvp[off=method])))) {
2876 lr = -1; /* Call method for left argument */
2878 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2881 /* look for substituted methods */
2882 /* In all the covered cases we should be called with assign==0. */
2886 if ((cv = cvp[off=add_ass_amg])
2887 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
2888 right = &PL_sv_yes; lr = -1; assign = 1;
2893 if ((cv = cvp[off = subtr_ass_amg])
2894 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
2895 right = &PL_sv_yes; lr = -1; assign = 1;
2899 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
2902 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
2905 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
2908 (void)((cv = cvp[off=bool__amg])
2909 || (cv = cvp[off=numer_amg])
2910 || (cv = cvp[off=string_amg]));
2917 * SV* ref causes confusion with the interpreter variable of
2920 SV* const tmpRef=SvRV(left);
2921 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
2923 * Just to be extra cautious. Maybe in some
2924 * additional cases sv_setsv is safe, too.
2926 SV* const newref = newSVsv(tmpRef);
2927 SvOBJECT_on(newref);
2928 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
2929 delegate to the stash. */
2930 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
2936 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
2937 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
2938 SV* const nullsv=sv_2mortal(newSViv(0));
2940 SV* const lessp = amagic_call(left,nullsv,
2941 lt_amg,AMGf_noright);
2942 logic = SvTRUE(lessp);
2944 SV* const lessp = amagic_call(left,nullsv,
2945 ncmp_amg,AMGf_noright);
2946 logic = (SvNV(lessp) < 0);
2949 if (off==subtr_amg) {
2960 if ((cv = cvp[off=subtr_amg])) {
2962 left = sv_2mortal(newSViv(0));
2967 case iter_amg: /* XXXX Eventually should do to_gv. */
2968 case ftest_amg: /* XXXX Eventually should do to_gv. */
2971 return NULL; /* Delegate operation to standard mechanisms. */
2979 return left; /* Delegate operation to standard mechanisms. */
2984 if (!cv) goto not_found;
2985 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
2986 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
2987 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
2988 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
2989 ? (amtp = (AMT*)mg->mg_ptr)->table
2991 && (cv = cvp[off=method])) { /* Method for right
2994 } else if (((cvp && amtp->fallback > AMGfallNEVER)
2995 || (ocvp && oamtp->fallback > AMGfallNEVER))
2996 && !(flags & AMGf_unary)) {
2997 /* We look for substitution for
2998 * comparison operations and
3000 if (method==concat_amg || method==concat_ass_amg
3001 || method==repeat_amg || method==repeat_ass_amg) {
3002 return NULL; /* Delegate operation to string conversion */
3024 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3028 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3038 not_found: /* No method found, either report or croak */
3046 return left; /* Delegate operation to standard mechanisms. */
3048 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3049 notfound = 1; lr = -1;
3050 } else if (cvp && (cv=cvp[nomethod_amg])) {
3051 notfound = 1; lr = 1;
3052 } else if ((use_default_op =
3053 (!ocvp || oamtp->fallback >= AMGfallYES)
3054 && (!cvp || amtp->fallback >= AMGfallYES))
3056 /* Skip generating the "no method found" message. */
3060 if (off==-1) off=method;
3061 msg = sv_2mortal(Perl_newSVpvf(aTHX_
3062 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
3063 AMG_id2name(method + assignshift),
3064 (flags & AMGf_unary ? " " : "\n\tleft "),
3066 "in overloaded package ":
3067 "has no overloaded magic",
3069 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3072 ",\n\tright argument in overloaded package ":
3075 : ",\n\tright argument has no overloaded magic"),
3077 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3078 SVfARG(&PL_sv_no)));
3079 if (use_default_op) {
3080 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
3082 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
3086 force_cpy = force_cpy || assign;
3091 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3092 * operation. we need this to return a value, so that it can be assigned
3093 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3094 * increment or decrement was itself called in void context */
3100 if (off == subtr_amg)
3103 /* in these cases, we're calling an assignment variant of an operator
3104 * (+= rather than +, for instance). regardless of whether it's a
3105 * fallback or not, it always has to return a value, which will be
3106 * assigned to the proper variable later */
3123 /* the copy constructor always needs to return a value */
3127 /* because of the way these are implemented (they don't perform the
3128 * dereferencing themselves, they return a reference that perl then
3129 * dereferences later), they always have to be in scalar context */
3137 /* these don't have an op of their own; they're triggered by their parent
3138 * op, so the context there isn't meaningful ('$a and foo()' in void
3139 * context still needs to pass scalar context on to $a's bool overload) */
3149 DEBUG_o(Perl_deb(aTHX_
3150 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
3152 method+assignshift==off? "" :
3154 method+assignshift==off? "" :
3155 AMG_id2name(method+assignshift),
3156 method+assignshift==off? "" : "\")",
3157 flags & AMGf_unary? "" :
3158 lr==1 ? " for right argument": " for left argument",
3159 flags & AMGf_unary? " for argument" : "",
3160 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
3161 fl? ",\n\tassignment variant used": "") );
3164 /* Since we use shallow copy during assignment, we need
3165 * to dublicate the contents, probably calling user-supplied
3166 * version of copy operator
3168 /* We need to copy in following cases:
3169 * a) Assignment form was called.
3170 * assignshift==1, assign==T, method + 1 == off
3171 * b) Increment or decrement, called directly.
3172 * assignshift==0, assign==0, method + 0 == off
3173 * c) Increment or decrement, translated to assignment add/subtr.
3174 * assignshift==0, assign==T,
3176 * d) Increment or decrement, translated to nomethod.
3177 * assignshift==0, assign==0,
3179 * e) Assignment form translated to nomethod.
3180 * assignshift==1, assign==T, method + 1 != off
3183 /* off is method, method+assignshift, or a result of opcode substitution.
3184 * In the latter case assignshift==0, so only notfound case is important.
3186 if ( (lr == -1) && ( ( (method + assignshift == off)
3187 && (assign || (method == inc_amg) || (method == dec_amg)))
3190 /* newSVsv does not behave as advertised, so we copy missing
3191 * information by hand */
3192 SV *tmpRef = SvRV(left);
3194 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
3195 SvRV_set(left, rv_copy);
3197 SvREFCNT_dec_NN(tmpRef);
3205 const bool oldcatch = CATCH_GET;
3207 int gimme = force_scalar ? G_SCALAR : GIMME_V;
3210 Zero(&myop, 1, BINOP);
3211 myop.op_last = (OP *) &myop;
3212 myop.op_next = NULL;
3213 myop.op_flags = OPf_STACKED;
3217 myop.op_flags |= OPf_WANT_VOID;
3220 if (flags & AMGf_want_list) {
3221 myop.op_flags |= OPf_WANT_LIST;
3226 myop.op_flags |= OPf_WANT_SCALAR;
3230 PUSHSTACKi(PERLSI_OVERLOAD);
3233 PL_op = (OP *) &myop;
3234 if (PERLDB_SUB && PL_curstash != PL_debstash)
3235 PL_op->op_private |= OPpENTERSUB_DB;
3236 Perl_pp_pushmark(aTHX);
3238 EXTEND(SP, notfound + 5);
3239 PUSHs(lr>0? right: left);
3240 PUSHs(lr>0? left: right);
3241 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
3243 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3244 AMG_id2namelen(method + assignshift), SVs_TEMP));
3246 PUSHs(MUTABLE_SV(cv));
3250 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
3254 nret = SP - (PL_stack_base + oldmark);
3258 /* returning NULL has another meaning, and we check the context
3259 * at the call site too, so this can be differentiated from the
3262 SP = PL_stack_base + oldmark;
3265 if (flags & AMGf_want_list) {
3266 res = sv_2mortal((SV *)newAV());
3267 av_extend((AV *)res, nret);
3269 av_store((AV *)res, nret, POPs);
3281 CATCH_SET(oldcatch);
3288 ans=SvIV(res)<=0; break;
3291 ans=SvIV(res)<0; break;
3294 ans=SvIV(res)>=0; break;
3297 ans=SvIV(res)>0; break;
3300 ans=SvIV(res)==0; break;
3303 ans=SvIV(res)!=0; break;
3306 SvSetSV(left,res); return left;
3308 ans=!SvTRUE(res); break;
3313 } else if (method==copy_amg) {
3315 Perl_croak(aTHX_ "Copy method did not return a reference");
3317 return SvREFCNT_inc(SvRV(res));
3325 Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3330 PERL_ARGS_ASSERT_GV_NAME_SET;
3333 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3335 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3336 unshare_hek(GvNAME_HEK(gv));
3339 PERL_HASH(hash, name, len);
3340 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
3344 =for apidoc gv_try_downgrade
3346 If the typeglob C<gv> can be expressed more succinctly, by having
3347 something other than a real GV in its place in the stash, replace it
3348 with the optimised form. Basic requirements for this are that C<gv>
3349 is a real typeglob, is sufficiently ordinary, and is only referenced
3350 from its package. This function is meant to be used when a GV has been
3351 looked up in part to see what was there, causing upgrading, but based
3352 on what was found it turns out that the real GV isn't required after all.
3354 If C<gv> is a completely empty typeglob, it is deleted from the stash.
3356 If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3357 sub, the typeglob is replaced with a scalar-reference placeholder that
3358 more compactly represents the same thing.
3364 Perl_gv_try_downgrade(pTHX_ GV *gv)
3370 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
3372 /* XXX Why and where does this leave dangling pointers during global
3374 if (PL_phase == PERL_PHASE_DESTRUCT) return;
3376 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
3377 !SvOBJECT(gv) && !SvREADONLY(gv) &&
3378 isGV_with_GP(gv) && GvGP(gv) &&
3379 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
3380 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
3381 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
3383 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3385 if (SvMAGICAL(gv)) {
3387 /* only backref magic is allowed */
3388 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3390 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3391 if (mg->mg_type != PERL_MAGIC_backref)
3397 HEK *gvnhek = GvNAME_HEK(gv);
3398 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
3399 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 &&
3400 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
3401 CvSTASH(cv) == stash && CvGV(cv) == gv &&
3402 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3403 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3404 (namehek = GvNAME_HEK(gv)) &&
3405 (gvp = hv_fetchhek(stash, namehek, 0)) &&
3407 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
3408 const bool imported = !!GvIMPORTED_CV(gv);
3412 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
3413 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3414 STRUCT_OFFSET(XPVIV, xiv_iv));
3415 SvRV_set(gv, value);
3420 Perl_gv_override(pTHX_ const char * const name, const STRLEN len)
3422 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV);
3424 PERL_ARGS_ASSERT_GV_OVERRIDE;
3425 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv;
3426 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE);
3427 gv = gvp ? *gvp : NULL;
3428 if (gv && !isGV(gv)) {
3429 if (!SvPCS_IMPORTED(gv)) return NULL;
3430 gv_init(gv, PL_globalstash, name, len, 0);
3433 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL;
3439 core_xsub(pTHX_ CV* cv)
3442 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3448 * c-indentation-style: bsd
3450 * indent-tabs-mode: nil
3453 * ex: set ts=8 sts=4 sw=4 et: