3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
12 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
13 * of your inquisitiveness, I shall spend all the rest of my days in answering
14 * you. What more do you want to know?'
15 * 'The names of all the stars, and of all living things, and the whole
16 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
19 * [p.599 of _The Lord of the Rings_, III/xi: "The PalantÃr"]
24 A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
25 It is a structure that holds a pointer to a scalar, an array, a hash etc,
26 corresponding to $foo, @foo, %foo.
28 GVs are usually found as values in stashes (symbol table hashes) where
29 Perl stores its global variables.
41 static const char S_autoload[] = "AUTOLOAD";
42 static const STRLEN S_autolen = sizeof(S_autoload)-1;
45 Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
52 SvTYPE((const SV *)gv) != SVt_PVGV
53 && SvTYPE((const SV *)gv) != SVt_PVLV
57 if (type == SVt_PVIO) {
59 * if it walks like a dirhandle, then let's assume that
60 * this is a dirhandle.
62 what = OP_IS_DIRHOP(PL_op->op_type) ?
63 "dirhandle" : "filehandle";
64 } else if (type == SVt_PVHV) {
67 what = type == SVt_PVAV ? "array" : "scalar";
69 /* diag_listed_as: Bad symbol for filehandle */
70 Perl_croak(aTHX_ "Bad symbol for %s", what);
73 if (type == SVt_PVHV) {
74 where = (SV **)&GvHV(gv);
75 } else if (type == SVt_PVAV) {
76 where = (SV **)&GvAV(gv);
77 } else if (type == SVt_PVIO) {
78 where = (SV **)&GvIOp(gv);
85 *where = newSV_type(type);
86 if (type == SVt_PVAV && GvNAMELEN(gv) == 3
87 && strnEQ(GvNAME(gv), "ISA", 3))
88 sv_magic(*where, (SV *)gv, PERL_MAGIC_isa, NULL, 0);
94 Perl_gv_fetchfile(pTHX_ const char *name)
96 PERL_ARGS_ASSERT_GV_FETCHFILE;
97 return gv_fetchfile_flags(name, strlen(name), 0);
101 Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
106 const STRLEN tmplen = namelen + 2;
109 PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS;
110 PERL_UNUSED_ARG(flags);
115 if (tmplen <= sizeof smallbuf)
118 Newx(tmpbuf, tmplen, char);
119 /* This is where the debugger's %{"::_<$filename"} hash is created */
122 memcpy(tmpbuf + 2, name, namelen);
123 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
125 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
126 #ifdef PERL_DONT_CREATE_GVSV
127 GvSV(gv) = newSVpvn(name, namelen);
129 sv_setpvn(GvSV(gv), name, namelen);
132 if ((PERLDB_LINE || PERLDB_SAVESRC) && !GvAV(gv))
133 hv_magic(GvHVn(gv), GvAVn(gv), PERL_MAGIC_dbfile);
134 if (tmpbuf != smallbuf)
140 =for apidoc gv_const_sv
142 If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
143 inlining, or C<gv> is a placeholder reference that would be promoted to such
144 a typeglob, then returns the value returned by the sub. Otherwise, returns
151 Perl_gv_const_sv(pTHX_ GV *gv)
153 PERL_ARGS_ASSERT_GV_CONST_SV;
156 if (SvTYPE(gv) == SVt_PVGV)
157 return cv_const_sv(GvCVu(gv));
158 return SvROK(gv) && SvTYPE(SvRV(gv)) != SVt_PVAV ? SvRV(gv) : NULL;
162 Perl_newGP(pTHX_ GV *const gv)
173 PERL_ARGS_ASSERT_NEWGP;
175 gp->gp_egv = gv; /* allow compiler to reuse gv after this */
176 #ifndef PERL_DONT_CREATE_GVSV
177 gp->gp_sv = newSV(0);
180 /* PL_curcop may be null here. E.g.,
181 INIT { bless {} and exit }
182 frees INIT before looking up DESTROY (and creating *DESTROY)
185 gp->gp_line = CopLINE(PL_curcop); /* 0 otherwise Newxz */
187 if (CopFILE(PL_curcop)) {
188 file = CopFILE(PL_curcop);
192 filegv = CopFILEGV(PL_curcop);
194 file = GvNAME(filegv)+2;
195 len = GvNAMELEN(filegv)-2;
206 PERL_HASH(hash, file, len);
207 gp->gp_file_hek = share_hek(file, len, hash);
213 /* Assign CvGV(cv) = gv, handling weak references.
214 * See also S_anonymise_cv_maybe */
217 Perl_cvgv_set(pTHX_ CV* cv, GV* gv)
219 GV * const oldgv = CvNAMED(cv) ? NULL : SvANY(cv)->xcv_gv_u.xcv_gv;
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))) {
241 SvANY(cv)->xcv_gv_u.xcv_gv = gv;
242 assert(!CvCVGV_RC(cv));
247 if (isGV_with_GP(gv) && GvGP(gv) && (GvCV(gv) == cv || GvFORM(gv) == cv))
248 Perl_sv_add_backref(aTHX_ MUTABLE_SV(gv), MUTABLE_SV(cv));
251 SvREFCNT_inc_simple_void_NN(gv);
255 /* Convert CvSTASH + CvNAME_HEK into a GV. Conceptually, all subs have a
256 GV, but for efficiency that GV may not in fact exist. This function,
257 called by CvGV, reifies it. */
260 Perl_cvgv_from_hek(pTHX_ CV *cv)
264 PERL_ARGS_ASSERT_CVGV_FROM_HEK;
265 assert(SvTYPE(cv) == SVt_PVCV);
266 if (!CvSTASH(cv)) return NULL;
267 ASSUME(CvNAME_HEK(cv));
268 svp = hv_fetchhek(CvSTASH(cv), CvNAME_HEK(cv), 0);
269 gv = MUTABLE_GV(svp && *svp ? *svp : newSV(0));
271 gv_init_pvn(gv, CvSTASH(cv), HEK_KEY(CvNAME_HEK(cv)),
272 HEK_LEN(CvNAME_HEK(cv)),
273 SVf_UTF8 * !!HEK_UTF8(CvNAME_HEK(cv)));
274 if (!CvNAMED(cv)) { /* gv_init took care of it */
275 assert (SvANY(cv)->xcv_gv_u.xcv_gv == gv);
278 unshare_hek(CvNAME_HEK(cv));
280 SvANY(cv)->xcv_gv_u.xcv_gv = gv;
281 if (svp && *svp) SvREFCNT_inc_simple_void_NN(gv);
286 /* Assign CvSTASH(cv) = st, handling weak references. */
289 Perl_cvstash_set(pTHX_ CV *cv, HV *st)
291 HV *oldst = CvSTASH(cv);
292 PERL_ARGS_ASSERT_CVSTASH_SET;
296 sv_del_backref(MUTABLE_SV(oldst), MUTABLE_SV(cv));
297 SvANY(cv)->xcv_stash = st;
299 Perl_sv_add_backref(aTHX_ MUTABLE_SV(st), MUTABLE_SV(cv));
303 =for apidoc gv_init_pvn
305 Converts a scalar into a typeglob. This is an incoercible typeglob;
306 assigning a reference to it will assign to one of its slots, instead of
307 overwriting it as happens with typeglobs created by SvSetSV. Converting
308 any scalar that is SvOK() may produce unpredictable results and is reserved
309 for perl's internal use.
311 C<gv> is the scalar to be converted.
313 C<stash> is the parent stash/package, if any.
315 C<name> and C<len> give the name. The name must be unqualified;
316 that is, it must not include the package name. If C<gv> is a
317 stash element, it is the caller's responsibility to ensure that the name
318 passed to this function matches the name of the element. If it does not
319 match, perl's internal bookkeeping will get out of sync.
321 C<flags> can be set to SVf_UTF8 if C<name> is a UTF8 string, or
322 the return value of SvUTF8(sv). It can also take the
323 GV_ADDMULTI flag, which means to pretend that the GV has been
324 seen before (i.e., suppress "Used once" warnings).
328 The old form of gv_init_pvn(). It does not work with UTF8 strings, as it
329 has no flags parameter. If the C<multi> parameter is set, the
330 GV_ADDMULTI flag will be passed to gv_init_pvn().
332 =for apidoc gv_init_pv
334 Same as gv_init_pvn(), but takes a nul-terminated string for the name
335 instead of separate char * and length parameters.
337 =for apidoc gv_init_sv
339 Same as gv_init_pvn(), but takes an SV * for the name instead of separate
340 char * and length parameters. C<flags> is currently unused.
346 Perl_gv_init_sv(pTHX_ GV *gv, HV *stash, SV* namesv, U32 flags)
350 PERL_ARGS_ASSERT_GV_INIT_SV;
351 namepv = SvPV(namesv, namelen);
354 gv_init_pvn(gv, stash, namepv, namelen, flags);
358 Perl_gv_init_pv(pTHX_ GV *gv, HV *stash, const char *name, U32 flags)
360 PERL_ARGS_ASSERT_GV_INIT_PV;
361 gv_init_pvn(gv, stash, name, strlen(name), flags);
365 Perl_gv_init_pvn(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, U32 flags)
367 const U32 old_type = SvTYPE(gv);
368 const bool doproto = old_type > SVt_NULL;
369 char * const proto = (doproto && SvPOK(gv))
370 ? ((void)(SvIsCOW(gv) && (sv_force_normal((SV *)gv), 0)), SvPVX(gv))
372 const STRLEN protolen = proto ? SvCUR(gv) : 0;
373 const U32 proto_utf8 = proto ? SvUTF8(gv) : 0;
374 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
375 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
377 PERL_ARGS_ASSERT_GV_INIT_PVN;
378 assert (!(proto && has_constant));
381 /* The constant has to be a scalar, array or subroutine. */
382 switch (SvTYPE(has_constant)) {
386 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
387 sv_reftype(has_constant, 0));
396 if (old_type < SVt_PVGV) {
397 if (old_type >= SVt_PV)
399 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
407 Safefree(SvPVX_mutable(gv));
412 GvGP_set(gv, Perl_newGP(aTHX_ gv));
415 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
416 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
417 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
418 GvMULTI_on(gv); /* _was_ mentioned */
419 if (has_constant && SvTYPE(has_constant) == SVt_PVCV) {
420 /* Not actually a constant. Just a regular sub. */
421 CV * const cv = (CV *)has_constant;
423 if (CvSTASH(cv) == stash && (
424 CvNAME_HEK(cv) == GvNAME_HEK(gv)
425 || ( HEK_LEN(CvNAME_HEK(cv)) == HEK_LEN(GvNAME_HEK(gv))
426 && HEK_FLAGS(CvNAME_HEK(cv)) != HEK_FLAGS(GvNAME_HEK(gv))
427 && HEK_UTF8(CvNAME_HEK(cv)) == HEK_UTF8(GvNAME_HEK(gv))
428 && memEQ(HEK_KEY(CvNAME_HEK(cv)), GvNAME(gv), GvNAMELEN(gv))
436 /* newCONSTSUB takes ownership of the reference from us. */
437 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
438 /* In case op.c:S_process_special_blocks stole it: */
440 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
441 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
442 /* If this reference was a copy of another, then the subroutine
443 must have been "imported", by a Perl space assignment to a GV
444 from a reference to CV. */
445 if (exported_constant)
446 GvIMPORTED_CV_on(gv);
447 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
452 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
453 SV_HAS_TRAILING_NUL);
454 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
460 S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
462 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
474 #ifdef PERL_DONT_CREATE_GVSV
482 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
483 If we just cast GvSVn(gv) to void, it ignores evaluating it for
490 static void core_xsub(pTHX_ CV* cv);
493 S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
494 const char * const name, const STRLEN len)
496 const int code = keyword(name, len, 1);
497 static const char file[] = __FILE__;
498 CV *cv, *oldcompcv = NULL;
500 bool ampable = TRUE; /* &{}-able */
501 COP *oldcurcop = NULL;
502 yy_parser *oldparser = NULL;
503 I32 oldsavestack_ix = 0;
508 if (!code) return NULL; /* Not a keyword */
509 switch (code < 0 ? -code : code) {
510 /* no support for \&CORE::infix;
511 no support for funcs that do not parse like funcs */
512 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
513 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp:
514 case KEY_default : case KEY_DESTROY:
515 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
516 case KEY_END : case KEY_eq : case KEY_eval :
517 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
518 case KEY_given : case KEY_goto : case KEY_grep :
519 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
520 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
521 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
522 case KEY_package: case KEY_print: case KEY_printf:
523 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
524 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
525 case KEY_s : case KEY_say : case KEY_sort :
526 case KEY_state: case KEY_sub :
527 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
528 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
529 case KEY_x : case KEY_xor : case KEY_y :
532 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
533 case KEY_each : case KEY_eof : case KEY_exec : case KEY_exists:
539 case KEY_splice: case KEY_split:
542 case KEY_truncate: case KEY_unlink:
549 gv_init(gv, stash, name, len, TRUE);
554 oldcurcop = PL_curcop;
555 oldparser = PL_parser;
556 lex_start(NULL, NULL, 0);
557 oldcompcv = PL_compcv;
558 PL_compcv = NULL; /* Prevent start_subparse from setting
560 oldsavestack_ix = start_subparse(FALSE,0);
564 /* Avoid calling newXS, as it calls us, and things start to
566 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
570 CvXSUB(cv) = core_xsub;
573 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
575 (void)gv_fetchfile(file);
576 CvFILE(cv) = (char *)file;
577 /* XXX This is inefficient, as doing things this order causes
578 a prototype check in newATTRSUB. But we have to do
579 it this order as we need an op number before calling
581 (void)core_prototype((SV *)cv, name, code, &opnum);
583 (void)hv_store(stash,name,len,(SV *)gv,0);
589 /* newATTRSUB will free the CV and return NULL if we're still
590 compiling after a syntax error */
591 if ((cv = newATTRSUB_x(
592 oldsavestack_ix, (OP *)gv,
597 : newSVpvn(name,len),
602 assert(GvCV(gv) == orig_cv);
603 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
604 && opnum != OP_UNDEF)
605 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
608 PL_parser = oldparser;
609 PL_curcop = oldcurcop;
610 PL_compcv = oldcompcv;
613 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
615 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
617 SvREFCNT_dec(opnumsv);
624 =for apidoc gv_fetchmeth
626 Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
628 =for apidoc gv_fetchmeth_sv
630 Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
631 of an SV instead of a string/length pair.
637 Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
641 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
642 namepv = SvPV(namesv, namelen);
645 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
649 =for apidoc gv_fetchmeth_pv
651 Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
652 instead of a string/length pair.
658 Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
660 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
661 return gv_fetchmeth_pvn(stash, name, strlen(name), level, flags);
665 =for apidoc gv_fetchmeth_pvn
667 Returns the glob with the given C<name> and a defined subroutine or
668 C<NULL>. The glob lives in the given C<stash>, or in the stashes
669 accessible via @ISA and UNIVERSAL::.
671 The argument C<level> should be either 0 or -1. If C<level==0>, as a
672 side-effect creates a glob with the given C<name> in the given C<stash>
673 which in the case of success contains an alias for the subroutine, and sets
674 up caching info for this glob.
676 The only significant values for C<flags> are GV_SUPER and SVf_UTF8.
678 GV_SUPER indicates that we want to look up the method in the superclasses
682 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
683 visible to Perl code. So when calling C<call_sv>, you should not use
684 the GV directly; instead, you should use the method's CV, which can be
685 obtained from the GV with the C<GvCV> macro.
690 /* NOTE: No support for tied ISA */
693 Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
699 HV* cstash, *cachestash;
700 GV* candidate = NULL;
704 I32 create = (level >= 0) ? 1 : 0;
707 U32 is_utf8 = flags & SVf_UTF8;
709 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
711 /* UNIVERSAL methods should be callable without a stash */
713 create = 0; /* probably appropriate */
714 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
720 hvname = HvNAME_get(stash);
722 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
727 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
728 flags & GV_SUPER ? "SUPER " : "",name,hvname) );
730 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
732 if (flags & GV_SUPER) {
733 if (!HvAUX(stash)->xhv_mro_meta->super)
734 HvAUX(stash)->xhv_mro_meta->super = newHV();
735 cachestash = HvAUX(stash)->xhv_mro_meta->super;
737 else cachestash = stash;
739 /* check locally for a real method or a cache entry */
740 gvp = (GV**)hv_fetch(cachestash, name, is_utf8 ? -(I32)len : (I32)len,
746 if (SvTYPE(topgv) != SVt_PVGV)
747 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
748 if ((cand_cv = GvCV(topgv))) {
749 /* If genuine method or valid cache entry, use it */
750 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
754 /* stale cache entry, junk it and move on */
755 SvREFCNT_dec_NN(cand_cv);
756 GvCV_set(topgv, NULL);
761 else if (GvCVGEN(topgv) == topgen_cmp) {
762 /* cache indicates no such method definitively */
765 else if (stash == cachestash
766 && len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
767 && strnEQ(hvname, "CORE", 4)
768 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
772 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
773 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
774 items = AvFILLp(linear_av); /* no +1, to skip over self */
776 linear_sv = *linear_svp++;
778 cstash = gv_stashsv(linear_sv, 0);
781 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
782 "Can't locate package %"SVf" for @%"HEKf"::ISA",
784 HEKfARG(HvNAME_HEK(stash)));
790 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
792 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
793 const char *hvname = HvNAME(cstash); assert(hvname);
794 if (strnEQ(hvname, "CORE", 4)
796 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
802 else candidate = *gvp;
805 if (SvTYPE(candidate) != SVt_PVGV)
806 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
807 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
809 * Found real method, cache method in topgv if:
810 * 1. topgv has no synonyms (else inheritance crosses wires)
811 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
813 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
814 CV *old_cv = GvCV(topgv);
815 SvREFCNT_dec(old_cv);
816 SvREFCNT_inc_simple_void_NN(cand_cv);
817 GvCV_set(topgv, cand_cv);
818 GvCVGEN(topgv) = topgen_cmp;
824 /* Check UNIVERSAL without caching */
825 if(level == 0 || level == -1) {
826 candidate = gv_fetchmeth_pvn(NULL, name, len, 1, flags &~GV_SUPER);
828 cand_cv = GvCV(candidate);
829 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
830 CV *old_cv = GvCV(topgv);
831 SvREFCNT_dec(old_cv);
832 SvREFCNT_inc_simple_void_NN(cand_cv);
833 GvCV_set(topgv, cand_cv);
834 GvCVGEN(topgv) = topgen_cmp;
840 if (topgv && GvREFCNT(topgv) == 1) {
841 /* cache the fact that the method is not defined */
842 GvCVGEN(topgv) = topgen_cmp;
849 =for apidoc gv_fetchmeth_autoload
851 This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
854 =for apidoc gv_fetchmeth_sv_autoload
856 Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
857 of an SV instead of a string/length pair.
863 Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
867 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
868 namepv = SvPV(namesv, namelen);
871 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
875 =for apidoc gv_fetchmeth_pv_autoload
877 Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
878 instead of a string/length pair.
884 Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
886 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
887 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
891 =for apidoc gv_fetchmeth_pvn_autoload
893 Same as gv_fetchmeth_pvn(), but looks for autoloaded subroutines too.
894 Returns a glob for the subroutine.
896 For an autoloaded subroutine without a GV, will create a GV even
897 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
898 of the result may be zero.
900 Currently, the only significant value for C<flags> is SVf_UTF8.
906 Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
908 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
910 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
917 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
918 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
920 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
923 if (!(CvROOT(cv) || CvXSUB(cv)))
925 /* Have an autoload */
926 if (level < 0) /* Cannot do without a stub */
927 gv_fetchmeth_pvn(stash, name, len, 0, flags);
928 gvp = (GV**)hv_fetch(stash, name,
929 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
938 =for apidoc gv_fetchmethod_autoload
940 Returns the glob which contains the subroutine to call to invoke the method
941 on the C<stash>. In fact in the presence of autoloading this may be the
942 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
945 The third parameter of C<gv_fetchmethod_autoload> determines whether
946 AUTOLOAD lookup is performed if the given method is not present: non-zero
947 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
948 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
949 with a non-zero C<autoload> parameter.
951 These functions grant C<"SUPER"> token
952 as a prefix of the method name. Note
953 that if you want to keep the returned glob for a long time, you need to
954 check for it being "AUTOLOAD", since at the later time the call may load a
955 different subroutine due to $AUTOLOAD changing its value. Use the glob
956 created as a side effect to do this.
958 These functions have the same side-effects as C<gv_fetchmeth> with
959 C<level==0>. The warning against passing the GV returned by
960 C<gv_fetchmeth> to C<call_sv> applies equally to these functions.
966 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
968 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
970 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
974 Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
978 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
979 namepv = SvPV(namesv, namelen);
982 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
986 Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
988 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
989 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
992 /* Don't merge this yet, as it's likely to get a len parameter, and possibly
995 Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
998 const char *nsplit = NULL;
1001 const char * const origname = name;
1002 SV *const error_report = MUTABLE_SV(stash);
1003 const U32 autoload = flags & GV_AUTOLOAD;
1004 const U32 do_croak = flags & GV_CROAK;
1005 const U32 is_utf8 = flags & SVf_UTF8;
1007 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
1009 if (SvTYPE(stash) < SVt_PVHV)
1012 /* The only way stash can become NULL later on is if nsplit is set,
1013 which in turn means that there is no need for a SVt_PVHV case
1014 the error reporting code. */
1017 for (nend = name; *nend || nend != (origname + len); nend++) {
1018 if (*nend == '\'') {
1022 else if (*nend == ':' && *(nend + 1) == ':') {
1028 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
1029 /* ->SUPER::method should really be looked up in original stash */
1030 stash = CopSTASH(PL_curcop);
1032 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
1033 origname, HvENAME_get(stash), name) );
1035 else if ((nsplit - origname) >= 7 &&
1036 strnEQ(nsplit - 7, "::SUPER", 7)) {
1037 /* don't autovifify if ->NoSuchStash::SUPER::method */
1038 stash = gv_stashpvn(origname, nsplit - origname - 7, is_utf8);
1039 if (stash) flags |= GV_SUPER;
1042 /* don't autovifify if ->NoSuchStash::method */
1043 stash = gv_stashpvn(origname, nsplit - origname, is_utf8);
1048 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
1050 if (strEQ(name,"import") || strEQ(name,"unimport"))
1051 gv = MUTABLE_GV(&PL_sv_yes);
1053 gv = gv_autoload_pvn(
1054 ostash, name, nend - name, GV_AUTOLOAD_ISMETHOD|flags
1056 if (!gv && do_croak) {
1057 /* Right now this is exclusively for the benefit of S_method_common
1060 /* If we can't find an IO::File method, it might be a call on
1061 * a filehandle. If IO:File has not been loaded, try to
1062 * require it first instead of croaking */
1063 const char *stash_name = HvNAME_get(stash);
1064 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1065 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1066 STR_WITH_LEN("IO/File.pm"), 0,
1067 HV_FETCH_ISEXISTS, NULL, 0)
1069 require_pv("IO/File.pm");
1070 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
1075 "Can't locate object method \"%"UTF8f
1076 "\" via package \"%"HEKf"\"",
1077 UTF8fARG(is_utf8, nend - name, name),
1078 HEKfARG(HvNAME_HEK(stash)));
1084 packnamesv = newSVpvn_flags(origname, nsplit - origname,
1085 SVs_TEMP | is_utf8);
1087 packnamesv = error_report;
1091 "Can't locate object method \"%"UTF8f
1092 "\" via package \"%"SVf"\""
1093 " (perhaps you forgot to load \"%"SVf"\"?)",
1094 UTF8fARG(is_utf8, nend - name, name),
1095 SVfARG(packnamesv), SVfARG(packnamesv));
1099 else if (autoload) {
1100 CV* const cv = GvCV(gv);
1101 if (!CvROOT(cv) && !CvXSUB(cv)) {
1105 if (CvANON(cv) || CvLEXICAL(cv))
1109 if (GvCV(stubgv) != cv) /* orphaned import */
1112 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1113 GvNAME(stubgv), GvNAMELEN(stubgv),
1114 GV_AUTOLOAD_ISMETHOD
1115 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
1125 Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
1129 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
1130 namepv = SvPV(namesv, namelen);
1133 return gv_autoload_pvn(stash, namepv, namelen, flags);
1137 Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
1139 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
1140 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
1144 Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
1151 SV *packname = NULL;
1152 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
1154 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
1156 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
1159 if (SvTYPE(stash) < SVt_PVHV) {
1160 STRLEN packname_len = 0;
1161 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1162 packname = newSVpvn_flags(packname_ptr, packname_len,
1163 SVs_TEMP | SvUTF8(stash));
1167 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
1168 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
1170 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE,
1171 is_utf8 | (flags & GV_SUPER))))
1175 if (!(CvROOT(cv) || CvXSUB(cv)))
1179 * Inheriting AUTOLOAD for non-methods works ... for now.
1182 !(flags & GV_AUTOLOAD_ISMETHOD)
1183 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
1185 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
1186 "Use of inherited AUTOLOAD for non-method %"SVf
1187 "::%"UTF8f"() is deprecated",
1189 UTF8fARG(is_utf8, len, name));
1192 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1193 * and split that value on the last '::', pass along the same data
1194 * via the SvPVX field in the CV, and the stash in CvSTASH.
1196 * Due to an unfortunate accident of history, the SvPVX field
1197 * serves two purposes. It is also used for the subroutine's pro-
1198 * type. Since SvPVX has been documented as returning the sub name
1199 * for a long time, but not as returning the prototype, we have
1200 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1203 * We put the prototype in the same allocated buffer, but after
1204 * the sub name. The SvPOK flag indicates the presence of a proto-
1205 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1206 * If both flags are on, then SvLEN is used to indicate the end of
1207 * the prototype (artificially lower than what is actually allo-
1208 * cated), at the risk of having to reallocate a few bytes unneces-
1209 * sarily--but that should happen very rarely, if ever.
1211 * We use SvUTF8 for both prototypes and sub names, so if one is
1212 * UTF8, the other must be upgraded.
1214 CvSTASH_set(cv, stash);
1215 if (SvPOK(cv)) { /* Ouch! */
1216 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
1218 const char *proto = CvPROTO(cv);
1221 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1222 ulen = SvCUR(tmpsv);
1223 SvCUR(tmpsv)++; /* include null in string */
1225 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1227 SvTEMP_on(tmpsv); /* Allow theft */
1228 sv_setsv_nomg((SV *)cv, tmpsv);
1230 SvREFCNT_dec_NN(tmpsv);
1231 SvLEN(cv) = SvCUR(cv) + 1;
1235 sv_setpvn((SV *)cv, name, len);
1239 else SvUTF8_off(cv);
1245 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1246 * The subroutine's original name may not be "AUTOLOAD", so we don't
1247 * use that, but for lack of anything better we will use the sub's
1248 * original package to look up $AUTOLOAD.
1250 varstash = CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv));
1251 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
1255 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
1256 #ifdef PERL_DONT_CREATE_GVSV
1257 GvSV(vargv) = newSV(0);
1261 varsv = GvSVn(vargv);
1262 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1263 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
1264 sv_setsv(varsv, packname);
1265 sv_catpvs(varsv, "::");
1266 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1267 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
1270 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
1278 /* require_tie_mod() internal routine for requiring a module
1279 * that implements the logic of automatic ties like %! and %-
1281 * The "gv" parameter should be the glob.
1282 * "varpv" holds the name of the var, used for error messages.
1283 * "namesv" holds the module name. Its refcount will be decremented.
1284 * "methpv" holds the method name to test for to check that things
1285 * are working reasonably close to as expected.
1286 * "flags": if flag & 1 then save the scalar before loading.
1287 * For the protection of $! to work (it is set by this routine)
1288 * the sv slot must already be magicalized.
1291 S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
1293 HV* stash = gv_stashsv(namesv, 0);
1295 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1297 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
1298 SV *module = newSVsv(namesv);
1299 char varname = *varpv; /* varpv might be clobbered by load_module,
1300 so save it. For the moment it's always
1302 const char type = varname == '[' ? '$' : '%';
1310 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
1311 assert(sp == PL_stack_sp);
1312 stash = gv_stashsv(namesv, 0);
1314 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1315 type, varname, SVfARG(namesv));
1316 else if (!gv_fetchmethod(stash, methpv))
1317 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1318 type, varname, SVfARG(namesv), methpv);
1321 else SvREFCNT_dec_NN(namesv);
1326 =for apidoc gv_stashpv
1328 Returns a pointer to the stash for a specified package. Uses C<strlen> to
1329 determine the length of C<name>, then calls C<gv_stashpvn()>.
1335 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
1337 PERL_ARGS_ASSERT_GV_STASHPV;
1338 return gv_stashpvn(name, strlen(name), create);
1342 =for apidoc gv_stashpvn
1344 Returns a pointer to the stash for a specified package. The C<namelen>
1345 parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1346 to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1347 created if it does not already exist. If the package does not exist and
1348 C<flags> is 0 (or any other setting that does not create packages) then NULL
1351 Flags may be one of:
1360 The most important of which are probably GV_ADD and SVf_UTF8.
1362 Note, use of C<gv_stashsv> instead of C<gv_stashpvn> where possible is strongly
1363 recommended for performance reasons.
1369 gv_stashpvn_internal
1371 Perform the internal bits of gv_stashsvpvn_cached. You could think of this
1372 as being one half of the logic. Not to be called except from gv_stashsvpvn_cached().
1376 PERL_STATIC_INLINE HV*
1377 S_gv_stashpvn_internal(pTHX_ const char *name, U32 namelen, I32 flags)
1383 U32 tmplen = namelen + 2;
1385 PERL_ARGS_ASSERT_GV_STASHPVN_INTERNAL;
1387 if (tmplen <= sizeof smallbuf)
1390 Newx(tmpbuf, tmplen, char);
1391 Copy(name, tmpbuf, namelen, char);
1392 tmpbuf[namelen] = ':';
1393 tmpbuf[namelen+1] = ':';
1394 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
1395 if (tmpbuf != smallbuf)
1399 stash = GvHV(tmpgv);
1400 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
1402 if (!HvNAME_get(stash)) {
1403 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1405 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1406 /* If the containing stash has multiple effective
1407 names, see that this one gets them, too. */
1408 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1409 mro_package_moved(stash, NULL, tmpgv, 1);
1415 gv_stashsvpvn_cached
1417 Returns a pointer to the stash for a specified package, possibly
1418 cached. Implements both C<gv_stashpvn> and C<gc_stashsv>.
1420 Requires one of either namesv or namepv to be non-null.
1422 See C<gv_stashpvn> for details on "flags".
1424 Note the sv interface is strongly preferred for performance reasons.
1428 #define PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED \
1429 assert(namesv || name)
1431 PERL_STATIC_INLINE HV*
1432 S_gv_stashsvpvn_cached(pTHX_ SV *namesv, const char *name, U32 namelen, I32 flags)
1437 PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED;
1439 he = (HE *)hv_common(
1440 PL_stashcache, namesv, name, namelen,
1441 (flags & SVf_UTF8) ? HVhek_UTF8 : 0, 0, NULL, 0
1444 if (he) return INT2PTR(HV*,SvIVX(HeVAL(he)));
1445 else if (flags & GV_CACHE_ONLY) return NULL;
1448 if (SvOK(namesv)) { /* prevent double uninit warning */
1450 name = SvPV_const(namesv, len);
1452 flags |= SvUTF8(namesv);
1454 name = ""; namelen = 0;
1457 stash = gv_stashpvn_internal(name, namelen, flags);
1459 if (stash && namelen) {
1460 SV* const ref = newSViv(PTR2IV(stash));
1461 (void)hv_store(PL_stashcache, name,
1462 (flags & SVf_UTF8) ? -(I32)namelen : (I32)namelen, ref, 0);
1469 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
1471 PERL_ARGS_ASSERT_GV_STASHPVN;
1472 return gv_stashsvpvn_cached(NULL, name, namelen, flags);
1476 =for apidoc gv_stashsv
1478 Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
1480 Note this interface is strongly preferred over C<gv_stashpvn> for performance reasons.
1486 Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
1488 PERL_ARGS_ASSERT_GV_STASHSV;
1489 return gv_stashsvpvn_cached(sv, NULL, 0, flags);
1494 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
1495 PERL_ARGS_ASSERT_GV_FETCHPV;
1496 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
1500 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
1502 const char * const nambeg =
1503 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
1504 PERL_ARGS_ASSERT_GV_FETCHSV;
1505 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1508 PERL_STATIC_INLINE void
1509 S_gv_magicalize_isa(pTHX_ GV *gv)
1513 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1517 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1521 /* This function grabs name and tries to split a stash and glob
1522 * from its contents. TODO better description, comments
1524 * If the function returns TRUE and 'name == name_end', then
1525 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1527 PERL_STATIC_INLINE bool
1528 S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1529 STRLEN *len, const char *nambeg, STRLEN full_len,
1530 const U32 is_utf8, const I32 add)
1532 const char *name_cursor;
1533 const char *const name_end = nambeg + full_len;
1534 const char *const name_em1 = name_end - 1;
1536 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1538 if (full_len > 2 && **name == '*' && isIDFIRST_lazy_if(*name + 1, is_utf8)) {
1539 /* accidental stringify on a GV? */
1543 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1544 if (name_cursor < name_em1 &&
1545 ((*name_cursor == ':' && name_cursor[1] == ':')
1546 || *name_cursor == '\''))
1549 *stash = PL_defstash;
1550 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1553 *len = name_cursor - *name;
1554 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1557 if (*name_cursor == ':') {
1563 Newx(tmpbuf, *len+2, char);
1564 Copy(*name, tmpbuf, *len, char);
1565 tmpbuf[(*len)++] = ':';
1566 tmpbuf[(*len)++] = ':';
1569 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add);
1570 *gv = gvp ? *gvp : NULL;
1571 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1572 if (SvTYPE(*gv) != SVt_PVGV)
1573 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1579 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1582 if (!(*stash = GvHV(*gv))) {
1583 *stash = GvHV(*gv) = newHV();
1584 if (!HvNAME_get(*stash)) {
1585 if (GvSTASH(*gv) == PL_defstash && *len == 6
1586 && strnEQ(*name, "CORE", 4))
1587 hv_name_set(*stash, "CORE", 4, 0);
1590 *stash, nambeg, name_cursor-nambeg, is_utf8
1592 /* If the containing stash has multiple effective
1593 names, see that this one gets them, too. */
1594 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1595 mro_package_moved(*stash, NULL, *gv, 1);
1598 else if (!HvNAME_get(*stash))
1599 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1602 if (*name_cursor == ':')
1604 *name = name_cursor+1;
1605 if (*name == name_end) {
1607 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1612 *len = name_cursor - *name;
1616 /* Checks if an unqualified name is in the main stash */
1617 PERL_STATIC_INLINE bool
1618 S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
1620 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
1622 /* If it's an alphanumeric variable */
1623 if ( len && isIDFIRST_lazy_if(name, is_utf8) ) {
1624 /* Some "normal" variables are always in main::,
1625 * like INC or STDOUT.
1633 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1634 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1635 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
1639 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1644 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1645 && name[3] == 'I' && name[4] == 'N')
1649 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1650 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1651 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
1655 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1656 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1662 /* *{""}, or a special variable like $@ */
1670 /* This function is called if parse_gv_stash_name() failed to
1671 * find a stash, or if GV_NOTQUAL or an empty name was passed
1672 * to gv_fetchpvn_flags.
1674 * It returns FALSE if the default stash can't be found nor created,
1675 * which might happen during global destruction.
1677 PERL_STATIC_INLINE bool
1678 S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1679 const U32 is_utf8, const I32 add,
1680 const svtype sv_type)
1682 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1684 /* No stash in name, so see how we can default */
1686 if ( gv_is_in_main(name, len, is_utf8) ) {
1687 *stash = PL_defstash;
1690 if (IN_PERL_COMPILETIME) {
1691 *stash = PL_curstash;
1692 if (add && (PL_hints & HINT_STRICT_VARS) &&
1693 sv_type != SVt_PVCV &&
1694 sv_type != SVt_PVGV &&
1695 sv_type != SVt_PVFM &&
1696 sv_type != SVt_PVIO &&
1697 !(len == 1 && sv_type == SVt_PV &&
1698 (*name == 'a' || *name == 'b')) )
1700 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0);
1701 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1702 SvTYPE(*gvp) != SVt_PVGV)
1706 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1707 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1708 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1710 /* diag_listed_as: Variable "%s" is not imported%s */
1712 aTHX_ packWARN(WARN_MISC),
1713 "Variable \"%c%"UTF8f"\" is not imported",
1714 sv_type == SVt_PVAV ? '@' :
1715 sv_type == SVt_PVHV ? '%' : '$',
1716 UTF8fARG(is_utf8, len, name));
1719 aTHX_ packWARN(WARN_MISC),
1720 "\t(Did you mean &%"UTF8f" instead?)\n",
1721 UTF8fARG(is_utf8, len, name)
1728 /* Use the current op's stash */
1729 *stash = CopSTASH(PL_curcop);
1734 if (add && !PL_in_clean_all) {
1736 qerror(Perl_mess(aTHX_
1737 "Global symbol \"%s%"UTF8f
1738 "\" requires explicit package name (did you forget to "
1739 "declare \"my %s%"UTF8f"\"?)",
1740 (sv_type == SVt_PV ? "$"
1741 : sv_type == SVt_PVAV ? "@"
1742 : sv_type == SVt_PVHV ? "%"
1743 : ""), UTF8fARG(is_utf8, len, name),
1744 (sv_type == SVt_PV ? "$"
1745 : sv_type == SVt_PVAV ? "@"
1746 : sv_type == SVt_PVHV ? "%"
1747 : ""), UTF8fARG(is_utf8, len, name)));
1748 /* To maintain the output of errors after the strict exception
1749 * above, and to keep compat with older releases, rather than
1750 * placing the variables in the pad, we place
1751 * them in the <none>:: stash.
1753 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1755 /* symbol table under destruction */
1764 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1770 /* gv_magicalize() is called by gv_fetchpvn_flags when creating
1772 * Note that it does not insert the GV into the stash prior to
1773 * magicalization, which some variables require need in order
1774 * to work (like $[, %+, %-, %!), so callers must take care of
1777 * The return value has a specific meaning for gv_fetchpvn_flags:
1778 * If it returns true, and the gv is empty, it indicates that its
1779 * refcount should be decreased.
1781 PERL_STATIC_INLINE bool
1782 S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
1783 bool addmg, const svtype sv_type)
1787 PERL_ARGS_ASSERT_GV_MAGICALIZE;
1789 if (stash != PL_defstash) { /* not the main stash */
1790 /* We only have to check for a few names here: a, b, EXPORT, ISA
1791 and VERSION. All the others apply only to the main stash or to
1792 CORE (which is checked right after this). */
1794 const char * const name2 = name + 1;
1797 if (strnEQ(name2, "XPORT", 5))
1801 if (strEQ(name2, "SA"))
1802 gv_magicalize_isa(gv);
1805 if (strEQ(name2, "ERSION"))
1810 if (len == 1 && sv_type == SVt_PV)
1819 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1820 /* Avoid null warning: */
1821 const char * const stashname = HvNAME(stash); assert(stashname);
1822 if (strnEQ(stashname, "CORE", 4))
1823 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
1830 /* Nothing else to do.
1831 The compiler will probably turn the switch statement into a
1832 branch table. Make sure we avoid even that small overhead for
1833 the common case of lower case variable names. (On EBCDIC
1834 platforms, we can't just do:
1835 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1836 because cases like '\027' in the switch statement below are
1837 C1 (non-ASCII) controls on those platforms, so the remapping
1838 would make them larger than 'V')
1843 const char * const name2 = name + 1;
1846 if (strEQ(name2, "RGV")) {
1847 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1849 else if (strEQ(name2, "RGVOUT")) {
1854 if (strnEQ(name2, "XPORT", 5))
1858 if (strEQ(name2, "SA")) {
1859 gv_magicalize_isa(gv);
1863 if (strEQ(name2, "IG")) {
1866 if (!PL_psig_name) {
1867 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
1868 Newxz(PL_psig_pend, SIG_SIZE, int);
1869 PL_psig_ptr = PL_psig_name + SIG_SIZE;
1871 /* I think that the only way to get here is to re-use an
1872 embedded perl interpreter, where the previous
1873 use didn't clean up fully because
1874 PL_perl_destruct_level was 0. I'm not sure that we
1875 "support" that, in that I suspect in that scenario
1876 there are sufficient other garbage values left in the
1877 interpreter structure that something else will crash
1878 before we get here. I suspect that this is one of
1879 those "doctor, it hurts when I do this" bugs. */
1880 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
1881 Zero(PL_psig_pend, SIG_SIZE, int);
1885 hv_magic(hv, NULL, PERL_MAGIC_sig);
1886 for (i = 1; i < SIG_SIZE; i++) {
1887 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1889 sv_setsv(*init, &PL_sv_undef);
1894 if (strEQ(name2, "ERSION"))
1897 case '\003': /* $^CHILD_ERROR_NATIVE */
1898 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1901 case '\005': /* $^ENCODING */
1902 if (strEQ(name2, "NCODING"))
1905 case '\007': /* $^GLOBAL_PHASE */
1906 if (strEQ(name2, "LOBAL_PHASE"))
1909 case '\014': /* $^LAST_FH */
1910 if (strEQ(name2, "AST_FH"))
1913 case '\015': /* $^MATCH */
1914 if (strEQ(name2, "ATCH")) {
1915 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1919 case '\017': /* $^OPEN */
1920 if (strEQ(name2, "PEN"))
1923 case '\020': /* $^PREMATCH $^POSTMATCH */
1924 if (strEQ(name2, "REMATCH")) {
1925 paren = RX_BUFF_IDX_CARET_PREMATCH;
1928 if (strEQ(name2, "OSTMATCH")) {
1929 paren = RX_BUFF_IDX_CARET_POSTMATCH;
1933 case '\024': /* ${^TAINT} */
1934 if (strEQ(name2, "AINT"))
1937 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1938 if (strEQ(name2, "NICODE"))
1940 if (strEQ(name2, "TF8LOCALE"))
1942 if (strEQ(name2, "TF8CACHE"))
1945 case '\027': /* $^WARNING_BITS */
1946 if (strEQ(name2, "ARNING_BITS"))
1959 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1961 /* This snippet is taken from is_gv_magical */
1962 const char *end = name + len;
1963 while (--end > name) {
1967 paren = grok_atou(name, NULL);
1973 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1974 be case '\0' in this switch statement (ie a default case) */
1977 paren = RX_BUFF_IDX_FULLMATCH;
1980 paren = RX_BUFF_IDX_PREMATCH;
1983 paren = RX_BUFF_IDX_POSTMATCH;
1985 #ifdef PERL_SAWAMPERSAND
1987 sv_type == SVt_PVAV ||
1988 sv_type == SVt_PVHV ||
1989 sv_type == SVt_PVCV ||
1990 sv_type == SVt_PVFM ||
1992 )) { PL_sawampersand |=
1996 ? SAWAMPERSAND_MIDDLE
1997 : SAWAMPERSAND_RIGHT;
2010 paren = *name - '0';
2013 /* Flag the capture variables with a NULL mg_ptr
2014 Use mg_len for the array index to lookup. */
2015 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
2019 sv_setpv(GvSVn(gv),PL_chopset);
2023 #ifdef COMPLEX_STATUS
2024 SvUPGRADE(GvSVn(gv), SVt_PVLV);
2030 /* If %! has been used, automatically load Errno.pm. */
2032 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
2034 /* magicalization must be done before require_tie_mod is called */
2035 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
2037 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
2044 GvMULTI_on(gv); /* no used once warnings here */
2046 AV* const av = GvAVn(gv);
2047 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
2049 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
2050 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
2052 SvREADONLY_on(GvSVn(gv));
2055 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
2057 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
2065 if (sv_type == SVt_PV)
2066 /* diag_listed_as: $* is no longer supported */
2067 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
2068 "$%c is no longer supported", *name);
2070 case '\010': /* $^H */
2072 HV *const hv = GvHVn(gv);
2073 hv_magic(hv, NULL, PERL_MAGIC_hints);
2077 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2078 && FEATURE_ARYBASE_IS_ENABLED) {
2079 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
2082 else goto magicalize;
2084 case '\023': /* $^S */
2086 SvREADONLY_on(GvSVn(gv));
2102 case '\001': /* $^A */
2103 case '\003': /* $^C */
2104 case '\004': /* $^D */
2105 case '\005': /* $^E */
2106 case '\006': /* $^F */
2107 case '\011': /* $^I, NOT \t in EBCDIC */
2108 case '\016': /* $^N */
2109 case '\017': /* $^O */
2110 case '\020': /* $^P */
2111 case '\024': /* $^T */
2112 case '\027': /* $^W */
2114 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
2117 case '\014': /* $^L */
2118 sv_setpvs(GvSVn(gv),"\f");
2121 sv_setpvs(GvSVn(gv),"\034");
2125 SV * const sv = GvSV(gv);
2126 if (!sv_derived_from(PL_patchlevel, "version"))
2127 upg_version(PL_patchlevel, TRUE);
2128 GvSV(gv) = vnumify(PL_patchlevel);
2129 SvREADONLY_on(GvSV(gv));
2133 case '\026': /* $^V */
2135 SV * const sv = GvSV(gv);
2136 GvSV(gv) = new_version(PL_patchlevel);
2137 SvREADONLY_on(GvSV(gv));
2143 if (sv_type == SVt_PV)
2151 /* This function is called when the stash already holds the GV of the magic
2152 * variable we're looking for, but we need to check that it has the correct
2153 * kind of magic. For example, if someone first uses $! and then %!, the
2154 * latter would end up here, and we add the Errno tie to the HASH slot of
2157 PERL_STATIC_INLINE void
2158 S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2160 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2162 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2164 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
2165 else if (*name == '-' || *name == '+')
2166 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
2167 } else if (sv_type == SVt_PV) {
2168 if (*name == '*' || *name == '#') {
2169 /* diag_listed_as: $* is no longer supported */
2170 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2172 "$%c is no longer supported", *name);
2175 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2178 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
2180 #ifdef PERL_SAWAMPERSAND
2182 PL_sawampersand |= SAWAMPERSAND_LEFT;
2186 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2190 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2199 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2200 const svtype sv_type)
2202 const char *name = nambeg;
2207 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2208 const I32 no_expand = flags & GV_NOEXPAND;
2209 const I32 add = flags & ~GV_NOADD_MASK;
2210 const U32 is_utf8 = flags & SVf_UTF8;
2211 bool addmg = cBOOL(flags & GV_ADDMG);
2212 const char *const name_end = nambeg + full_len;
2215 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2217 /* If we have GV_NOTQUAL, the caller promised that
2218 * there is no stash, so we can skip the check.
2219 * Similarly if full_len is 0, since then we're
2220 * dealing with something like *{""} or ""->foo()
2222 if ((flags & GV_NOTQUAL) || !full_len) {
2225 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2226 if (name == name_end) return gv;
2232 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2236 /* By this point we should have a stash and a name */
2237 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
2238 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2239 if (addmg) gv = (GV *)newSV(0);
2242 else gv = *gvp, addmg = 0;
2243 /* From this point on, addmg means gv has not been inserted in the
2246 if (SvTYPE(gv) == SVt_PVGV) {
2247 /* The GV already exists, so return it, but check if we need to do
2248 * anything else with it before that.
2251 /* This is the heuristic that handles if a variable triggers the
2252 * 'used only once' warning. If there's already a GV in the stash
2253 * with this name, then we assume that the variable has been used
2254 * before and turn its MULTI flag on.
2255 * It's a heuristic because it can easily be "tricked", like with
2256 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2257 * not warning about $main::foo being used just once
2260 gv_init_svtype(gv, sv_type);
2261 /* You reach this path once the typeglob has already been created,
2262 either by the same or a different sigil. If this path didn't
2263 exist, then (say) referencing $! first, and %! second would
2264 mean that %! was not handled correctly. */
2265 if (len == 1 && stash == PL_defstash) {
2266 maybe_multimagic_gv(gv, name, sv_type);
2268 else if (len == 3 && sv_type == SVt_PVAV
2269 && strnEQ(name, "ISA", 3)
2270 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2271 gv_magicalize_isa(gv);
2274 } else if (no_init) {
2278 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2279 * don't expand it to a glob. This is an optimization so that things
2280 * copying constants over, like Exporter, don't have to be rewritten
2281 * to take into account that you can store more than just globs in
2284 else if (no_expand && SvROK(gv)) {
2289 /* Adding a new symbol.
2290 Unless of course there was already something non-GV here, in which case
2291 we want to behave as if there was always a GV here, containing some sort
2293 Otherwise we run the risk of creating things like GvIO, which can cause
2294 subtle bugs. eg the one that tripped up SQL::Translator */
2296 faking_it = SvOK(gv);
2298 if (add & GV_ADDWARN)
2299 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2300 "Had to create %"UTF8f" unexpectedly",
2301 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2302 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2304 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
2307 /* First, store the gv in the symtab if we're adding magic,
2308 * but only for non-empty GVs
2310 #define GvEMPTY(gv) !(GvAV(gv) || GvHV(gv) || GvIO(gv) \
2311 || GvCV(gv) || (GvSV(gv) && SvOK(GvSV(gv))))
2313 if ( addmg && !GvEMPTY(gv) ) {
2314 (void)hv_store(stash,name,len,(SV *)gv,0);
2317 /* set up magic where warranted */
2318 if ( gv_magicalize(gv, stash, name, len, addmg, sv_type) ) {
2321 if ( GvSV(gv) && SvMAGICAL(GvSV(gv)) ) {
2322 /* The GV was and still is "empty", except that now
2323 * it has the magic flags turned on, so we want it
2324 * stored in the symtab.
2326 (void)hv_store(stash,name,len,(SV *)gv,0);
2329 /* Most likely the temporary GV created above */
2330 SvREFCNT_dec_NN(gv);
2336 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
2341 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
2344 const HV * const hv = GvSTASH(gv);
2346 PERL_ARGS_ASSERT_GV_FULLNAME4;
2348 sv_setpv(sv, prefix ? prefix : "");
2350 if (hv && (name = HvNAME(hv))) {
2351 const STRLEN len = HvNAMELEN(hv);
2352 if (keepmain || strnNE(name, "main", len)) {
2353 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
2357 else sv_catpvs(sv,"__ANON__::");
2358 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
2362 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
2364 const GV * const egv = GvEGVx(gv);
2366 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2368 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
2372 /* recursively scan a stash and any nested stashes looking for entries
2373 * that need the "only used once" warning raised
2377 Perl_gv_check(pTHX_ HV *stash)
2381 PERL_ARGS_ASSERT_GV_CHECK;
2383 if (!HvARRAY(stash))
2386 assert(SvOOK(stash));
2388 for (i = 0; i <= (I32) HvMAX(stash); i++) {
2390 /* mark stash is being scanned, to avoid recursing */
2391 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
2392 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
2395 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
2396 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
2398 if (hv != PL_defstash && hv != stash
2400 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2402 gv_check(hv); /* nested package */
2404 else if ( *HeKEY(entry) != '_'
2405 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
2407 gv = MUTABLE_GV(HeVAL(entry));
2408 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
2411 CopLINE_set(PL_curcop, GvLINE(gv));
2413 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2415 CopFILEGV(PL_curcop)
2416 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2418 Perl_warner(aTHX_ packWARN(WARN_ONCE),
2419 "Name \"%"HEKf"::%"HEKf
2420 "\" used only once: possible typo",
2421 HEKfARG(HvNAME_HEK(stash)),
2422 HEKfARG(GvNAME_HEK(gv)));
2425 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
2430 Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
2432 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
2433 assert(!(flags & ~SVf_UTF8));
2435 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2436 UTF8fARG(flags, strlen(pack), pack),
2441 /* hopefully this is only called on local symbol table entries */
2444 Perl_gp_ref(pTHX_ GP *gp)
2451 /* If the GP they asked for a reference to contains
2452 a method cache entry, clear it first, so that we
2453 don't infect them with our cached entry */
2454 SvREFCNT_dec_NN(gp->gp_cv);
2463 Perl_gp_free(pTHX_ GV *gv)
2468 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
2470 if (gp->gp_refcnt == 0) {
2471 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2472 "Attempt to free unreferenced glob pointers"
2473 pTHX__FORMAT pTHX__VALUE);
2476 if (gp->gp_refcnt > 1) {
2478 if (gp->gp_egv == gv)
2486 /* Copy and null out all the glob slots, so destructors do not see
2488 HEK * const file_hek = gp->gp_file_hek;
2489 SV * const sv = gp->gp_sv;
2490 AV * const av = gp->gp_av;
2491 HV * const hv = gp->gp_hv;
2492 IO * const io = gp->gp_io;
2493 CV * const cv = gp->gp_cv;
2494 CV * const form = gp->gp_form;
2496 gp->gp_file_hek = NULL;
2505 unshare_hek(file_hek);
2509 /* FIXME - another reference loop GV -> symtab -> GV ?
2510 Somehow gp->gp_hv can end up pointing at freed garbage. */
2511 if (hv && SvTYPE(hv) == SVt_PVHV) {
2512 const HEK *hvname_hek = HvNAME_HEK(hv);
2513 DEBUG_o(Perl_deb(aTHX_ "gp_free clearing PL_stashcache for '%"HEKf"'\n", HEKfARG(hvname_hek)));
2514 if (PL_stashcache && hvname_hek)
2515 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
2518 if (io && SvREFCNT(io) == 1 && IoIFP(io)
2519 && (IoTYPE(io) == IoTYPE_WRONLY ||
2520 IoTYPE(io) == IoTYPE_RDWR ||
2521 IoTYPE(io) == IoTYPE_APPEND)
2522 && ckWARN_d(WARN_IO)
2523 && IoIFP(io) != PerlIO_stdin()
2524 && IoIFP(io) != PerlIO_stdout()
2525 && IoIFP(io) != PerlIO_stderr()
2526 && !(IoFLAGS(io) & IOf_FAKE_DIRP))
2527 io_close(io, gv, FALSE, TRUE);
2532 /* Possibly reallocated by a destructor */
2535 if (!gp->gp_file_hek
2541 && !gp->gp_form) break;
2543 if (--attempts == 0) {
2545 "panic: gp_free failed to free glob pointer - "
2546 "something is repeatedly re-creating entries"
2551 /* Possibly incremented by a destructor doing glob assignment */
2552 if (gp->gp_refcnt > 1) goto borrowed;
2558 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2560 AMT * const amtp = (AMT*)mg->mg_ptr;
2561 PERL_UNUSED_ARG(sv);
2563 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2565 if (amtp && AMT_AMAGIC(amtp)) {
2567 for (i = 1; i < NofAMmeth; i++) {
2568 CV * const cv = amtp->table[i];
2570 SvREFCNT_dec_NN(MUTABLE_SV(cv));
2571 amtp->table[i] = NULL;
2578 /* Updates and caches the CV's */
2580 * 1 on success and there is some overload
2581 * 0 if there is no overload
2582 * -1 if some error occurred and it couldn't croak
2586 Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
2588 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
2590 const struct mro_meta* stash_meta = HvMROMETA(stash);
2593 PERL_ARGS_ASSERT_GV_AMUPDATE;
2595 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
2597 const AMT * const amtp = (AMT*)mg->mg_ptr;
2598 if (amtp->was_ok_sub == newgen) {
2599 return AMT_AMAGIC(amtp) ? 1 : 0;
2601 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
2604 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
2607 amt.was_ok_sub = newgen;
2608 amt.fallback = AMGfallNO;
2614 bool deref_seen = 0;
2617 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
2619 /* Try to find via inheritance. */
2620 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
2621 SV * const sv = gv ? GvSV(gv) : NULL;
2626 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
2629 #ifdef PERL_DONT_CREATE_GVSV
2631 NOOP; /* Equivalent to !SvTRUE and !SvOK */
2634 else if (SvTRUE(sv))
2635 /* don't need to set overloading here because fallback => 1
2636 * is the default setting for classes without overloading */
2637 amt.fallback=AMGfallYES;
2638 else if (SvOK(sv)) {
2639 amt.fallback=AMGfallNEVER;
2646 assert(SvOOK(stash));
2647 /* initially assume the worst */
2648 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
2650 for (i = 1; i < NofAMmeth; i++) {
2651 const char * const cooky = PL_AMG_names[i];
2652 /* Human-readable form, for debugging: */
2653 const char * const cp = AMG_id2name(i);
2654 const STRLEN l = PL_AMG_namelens[i];
2656 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
2657 cp, HvNAME_get(stash)) );
2658 /* don't fill the cache while looking up!
2659 Creation of inheritance stubs in intermediate packages may
2660 conflict with the logic of runtime method substitution.
2661 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2662 then we could have created stubs for "(+0" in A and C too.
2663 But if B overloads "bool", we may want to use it for
2664 numifying instead of C's "+0". */
2665 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
2667 if (gv && (cv = GvCV(gv)) && CvHASGV(cv)) {
2668 const HEK * const gvhek =
2669 CvNAMED(cv) ? CvNAME_HEK(cv) : GvNAME_HEK(CvGV(cv));
2670 const HEK * const stashek =
2671 HvNAME_HEK(CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv)));
2672 if (HEK_LEN(gvhek) == 3 && strEQ(HEK_KEY(gvhek), "nil")
2673 && stashek && HEK_LEN(stashek) == 8
2674 && strEQ(HEK_KEY(stashek), "overload")) {
2675 /* This is a hack to support autoloading..., while
2676 knowing *which* methods were declared as overloaded. */
2677 /* GvSV contains the name of the method. */
2679 SV *gvsv = GvSV(gv);
2681 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2682 "\" for overloaded \"%s\" in package \"%.256s\"\n",
2683 (void*)GvSV(gv), cp, HvNAME(stash)) );
2684 if (!gvsv || !SvPOK(gvsv)
2685 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
2687 /* Can be an import stub (created by "can"). */
2692 const SV * const name = (gvsv && SvPOK(gvsv))
2694 : newSVpvs_flags("???", SVs_TEMP);
2695 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
2696 Perl_croak(aTHX_ "%s method \"%"SVf256
2697 "\" overloading \"%s\" "\
2698 "in package \"%"HEKf256"\"",
2699 (GvCVGEN(gv) ? "Stub found while resolving"
2707 cv = GvCV(gv = ngv);
2709 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
2710 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
2711 GvNAME(CvGV(cv))) );
2713 } else if (gv) { /* Autoloaded... */
2714 cv = MUTABLE_CV(gv);
2717 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
2733 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2734 * NB - aux var invalid here, HvARRAY() could have been
2735 * reallocated since it was assigned to */
2736 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
2739 AMT_AMAGIC_on(&amt);
2740 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
2741 (char*)&amt, sizeof(AMT));
2745 /* Here we have no table: */
2747 AMT_AMAGIC_off(&amt);
2748 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
2749 (char*)&amt, sizeof(AMTS));
2755 Perl_gv_handler(pTHX_ HV *stash, I32 id)
2760 struct mro_meta* stash_meta;
2762 if (!stash || !HvNAME_get(stash))
2765 stash_meta = HvMROMETA(stash);
2766 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
2768 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
2771 if (Gv_AMupdate(stash, 0) == -1)
2773 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
2776 amtp = (AMT*)mg->mg_ptr;
2777 if ( amtp->was_ok_sub != newgen )
2779 if (AMT_AMAGIC(amtp)) {
2780 CV * const ret = amtp->table[id];
2781 if (ret && isGV(ret)) { /* Autoloading stab */
2782 /* Passing it through may have resulted in a warning
2783 "Inherited AUTOLOAD for a non-method deprecated", since
2784 our caller is going through a function call, not a method call.
2785 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
2786 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
2798 /* Implement tryAMAGICun_MG macro.
2799 Do get magic, then see if the stack arg is overloaded and if so call it.
2801 AMGf_set return the arg using SETs rather than assigning to
2803 AMGf_numeric apply sv_2num to the stack arg.
2807 Perl_try_amagic_un(pTHX_ int method, int flags) {
2810 SV* const arg = TOPs;
2814 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2815 AMGf_noright | AMGf_unary))) {
2816 if (flags & AMGf_set) {
2821 if (SvPADMY(TARG)) {
2822 sv_setsv(TARG, tmpsv);
2832 if ((flags & AMGf_numeric) && SvROK(arg))
2838 /* Implement tryAMAGICbin_MG macro.
2839 Do get magic, then see if the two stack args are overloaded and if so
2842 AMGf_set return the arg using SETs rather than assigning to
2844 AMGf_assign op may be called as mutator (eg +=)
2845 AMGf_numeric apply sv_2num to the stack arg.
2849 Perl_try_amagic_bin(pTHX_ int method, int flags) {
2851 SV* const left = TOPm1s;
2852 SV* const right = TOPs;
2858 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2859 SV * const tmpsv = amagic_call(left, right, method,
2860 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2862 if (flags & AMGf_set) {
2869 if (opASSIGN || SvPADMY(TARG)) {
2870 sv_setsv(TARG, tmpsv);
2880 if(left==right && SvGMAGICAL(left)) {
2881 SV * const left = sv_newmortal();
2883 /* Print the uninitialized warning now, so it includes the vari-
2886 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2887 sv_setsv_flags(left, &PL_sv_no, 0);
2889 else sv_setsv_flags(left, right, 0);
2892 if (flags & AMGf_numeric) {
2894 *(sp-1) = sv_2num(TOPm1s);
2896 *sp = sv_2num(right);
2902 Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2906 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2910 /* return quickly if none of the deref ops are overloaded */
2911 stash = SvSTASH(SvRV(ref));
2912 assert(SvOOK(stash));
2913 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
2916 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
2917 AMGf_noright | AMGf_unary))) {
2919 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2920 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2921 /* Bail out if it returns us the same reference. */
2928 return tmpsv ? tmpsv : ref;
2932 Perl_amagic_is_enabled(pTHX_ int method)
2934 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2936 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2938 if ( !lex_mask || !SvOK(lex_mask) )
2939 /* overloading lexically disabled */
2941 else if ( lex_mask && SvPOK(lex_mask) ) {
2942 /* we have an entry in the hints hash, check if method has been
2943 * masked by overloading.pm */
2945 const int offset = method / 8;
2946 const int bit = method % 8;
2947 char *pv = SvPV(lex_mask, len);
2949 /* Bit set, so this overloading operator is disabled */
2950 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2957 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
2962 CV **cvp=NULL, **ocvp=NULL;
2963 AMT *amtp=NULL, *oamtp=NULL;
2964 int off = 0, off1, lr = 0, notfound = 0;
2965 int postpr = 0, force_cpy = 0;
2966 int assign = AMGf_assign & flags;
2967 const int assignshift = assign ? 1 : 0;
2968 int use_default_op = 0;
2969 int force_scalar = 0;
2975 PERL_ARGS_ASSERT_AMAGIC_CALL;
2977 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
2978 if (!amagic_is_enabled(method)) return NULL;
2981 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
2982 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
2983 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
2984 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
2985 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
2987 && ((cv = cvp[off=method+assignshift])
2988 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2994 cv = cvp[off=method])))) {
2995 lr = -1; /* Call method for left argument */
2997 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
3000 /* look for substituted methods */
3001 /* In all the covered cases we should be called with assign==0. */
3005 if ((cv = cvp[off=add_ass_amg])
3006 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3007 right = &PL_sv_yes; lr = -1; assign = 1;
3012 if ((cv = cvp[off = subtr_ass_amg])
3013 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3014 right = &PL_sv_yes; lr = -1; assign = 1;
3018 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
3021 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
3024 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
3027 (void)((cv = cvp[off=bool__amg])
3028 || (cv = cvp[off=numer_amg])
3029 || (cv = cvp[off=string_amg]));
3036 * SV* ref causes confusion with the interpreter variable of
3039 SV* const tmpRef=SvRV(left);
3040 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
3042 * Just to be extra cautious. Maybe in some
3043 * additional cases sv_setsv is safe, too.
3045 SV* const newref = newSVsv(tmpRef);
3046 SvOBJECT_on(newref);
3047 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
3048 delegate to the stash. */
3049 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
3055 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
3056 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
3057 SV* const nullsv=sv_2mortal(newSViv(0));
3059 SV* const lessp = amagic_call(left,nullsv,
3060 lt_amg,AMGf_noright);
3061 logic = SvTRUE(lessp);
3063 SV* const lessp = amagic_call(left,nullsv,
3064 ncmp_amg,AMGf_noright);
3065 logic = (SvNV(lessp) < 0);
3068 if (off==subtr_amg) {
3079 if ((cv = cvp[off=subtr_amg])) {
3081 left = sv_2mortal(newSViv(0));
3086 case iter_amg: /* XXXX Eventually should do to_gv. */
3087 case ftest_amg: /* XXXX Eventually should do to_gv. */
3090 return NULL; /* Delegate operation to standard mechanisms. */
3098 return left; /* Delegate operation to standard mechanisms. */
3103 if (!cv) goto not_found;
3104 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
3105 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
3106 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
3107 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
3108 ? (amtp = (AMT*)mg->mg_ptr)->table
3110 && (cv = cvp[off=method])) { /* Method for right
3113 } else if (((cvp && amtp->fallback > AMGfallNEVER)
3114 || (ocvp && oamtp->fallback > AMGfallNEVER))
3115 && !(flags & AMGf_unary)) {
3116 /* We look for substitution for
3117 * comparison operations and
3119 if (method==concat_amg || method==concat_ass_amg
3120 || method==repeat_amg || method==repeat_ass_amg) {
3121 return NULL; /* Delegate operation to string conversion */
3143 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3147 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3157 not_found: /* No method found, either report or croak */
3165 return left; /* Delegate operation to standard mechanisms. */
3167 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3168 notfound = 1; lr = -1;
3169 } else if (cvp && (cv=cvp[nomethod_amg])) {
3170 notfound = 1; lr = 1;
3171 } else if ((use_default_op =
3172 (!ocvp || oamtp->fallback >= AMGfallYES)
3173 && (!cvp || amtp->fallback >= AMGfallYES))
3175 /* Skip generating the "no method found" message. */
3179 if (off==-1) off=method;
3180 msg = sv_2mortal(Perl_newSVpvf(aTHX_
3181 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
3182 AMG_id2name(method + assignshift),
3183 (flags & AMGf_unary ? " " : "\n\tleft "),
3185 "in overloaded package ":
3186 "has no overloaded magic",
3188 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3191 ",\n\tright argument in overloaded package ":
3194 : ",\n\tright argument has no overloaded magic"),
3196 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3197 SVfARG(&PL_sv_no)));
3198 if (use_default_op) {
3199 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
3201 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
3205 force_cpy = force_cpy || assign;
3210 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3211 * operation. we need this to return a value, so that it can be assigned
3212 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3213 * increment or decrement was itself called in void context */
3219 if (off == subtr_amg)
3222 /* in these cases, we're calling an assignment variant of an operator
3223 * (+= rather than +, for instance). regardless of whether it's a
3224 * fallback or not, it always has to return a value, which will be
3225 * assigned to the proper variable later */
3242 /* the copy constructor always needs to return a value */
3246 /* because of the way these are implemented (they don't perform the
3247 * dereferencing themselves, they return a reference that perl then
3248 * dereferences later), they always have to be in scalar context */
3256 /* these don't have an op of their own; they're triggered by their parent
3257 * op, so the context there isn't meaningful ('$a and foo()' in void
3258 * context still needs to pass scalar context on to $a's bool overload) */
3268 DEBUG_o(Perl_deb(aTHX_
3269 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
3271 method+assignshift==off? "" :
3273 method+assignshift==off? "" :
3274 AMG_id2name(method+assignshift),
3275 method+assignshift==off? "" : "\")",
3276 flags & AMGf_unary? "" :
3277 lr==1 ? " for right argument": " for left argument",
3278 flags & AMGf_unary? " for argument" : "",
3279 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
3280 fl? ",\n\tassignment variant used": "") );
3283 /* Since we use shallow copy during assignment, we need
3284 * to dublicate the contents, probably calling user-supplied
3285 * version of copy operator
3287 /* We need to copy in following cases:
3288 * a) Assignment form was called.
3289 * assignshift==1, assign==T, method + 1 == off
3290 * b) Increment or decrement, called directly.
3291 * assignshift==0, assign==0, method + 0 == off
3292 * c) Increment or decrement, translated to assignment add/subtr.
3293 * assignshift==0, assign==T,
3295 * d) Increment or decrement, translated to nomethod.
3296 * assignshift==0, assign==0,
3298 * e) Assignment form translated to nomethod.
3299 * assignshift==1, assign==T, method + 1 != off
3302 /* off is method, method+assignshift, or a result of opcode substitution.
3303 * In the latter case assignshift==0, so only notfound case is important.
3305 if ( (lr == -1) && ( ( (method + assignshift == off)
3306 && (assign || (method == inc_amg) || (method == dec_amg)))
3309 /* newSVsv does not behave as advertised, so we copy missing
3310 * information by hand */
3311 SV *tmpRef = SvRV(left);
3313 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
3314 SvRV_set(left, rv_copy);
3316 SvREFCNT_dec_NN(tmpRef);
3324 const bool oldcatch = CATCH_GET;
3326 int gimme = force_scalar ? G_SCALAR : GIMME_V;
3329 Zero(&myop, 1, BINOP);
3330 myop.op_last = (OP *) &myop;
3331 myop.op_next = NULL;
3332 myop.op_flags = OPf_STACKED;
3336 myop.op_flags |= OPf_WANT_VOID;
3339 if (flags & AMGf_want_list) {
3340 myop.op_flags |= OPf_WANT_LIST;
3345 myop.op_flags |= OPf_WANT_SCALAR;
3349 PUSHSTACKi(PERLSI_OVERLOAD);
3352 PL_op = (OP *) &myop;
3353 if (PERLDB_SUB && PL_curstash != PL_debstash)
3354 PL_op->op_private |= OPpENTERSUB_DB;
3355 Perl_pp_pushmark(aTHX);
3357 EXTEND(SP, notfound + 5);
3358 PUSHs(lr>0? right: left);
3359 PUSHs(lr>0? left: right);
3360 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
3362 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3363 AMG_id2namelen(method + assignshift), SVs_TEMP));
3365 PUSHs(MUTABLE_SV(cv));
3369 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
3373 nret = SP - (PL_stack_base + oldmark);
3377 /* returning NULL has another meaning, and we check the context
3378 * at the call site too, so this can be differentiated from the
3381 SP = PL_stack_base + oldmark;
3384 if (flags & AMGf_want_list) {
3385 res = sv_2mortal((SV *)newAV());
3386 av_extend((AV *)res, nret);
3388 av_store((AV *)res, nret, POPs);
3400 CATCH_SET(oldcatch);
3407 ans=SvIV(res)<=0; break;
3410 ans=SvIV(res)<0; break;
3413 ans=SvIV(res)>=0; break;
3416 ans=SvIV(res)>0; break;
3419 ans=SvIV(res)==0; break;
3422 ans=SvIV(res)!=0; break;
3425 SvSetSV(left,res); return left;
3427 ans=!SvTRUE(res); break;
3432 } else if (method==copy_amg) {
3434 Perl_croak(aTHX_ "Copy method did not return a reference");
3436 return SvREFCNT_inc(SvRV(res));
3444 Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3449 PERL_ARGS_ASSERT_GV_NAME_SET;
3452 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3454 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3455 unshare_hek(GvNAME_HEK(gv));
3458 PERL_HASH(hash, name, len);
3459 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
3463 =for apidoc gv_try_downgrade
3465 If the typeglob C<gv> can be expressed more succinctly, by having
3466 something other than a real GV in its place in the stash, replace it
3467 with the optimised form. Basic requirements for this are that C<gv>
3468 is a real typeglob, is sufficiently ordinary, and is only referenced
3469 from its package. This function is meant to be used when a GV has been
3470 looked up in part to see what was there, causing upgrading, but based
3471 on what was found it turns out that the real GV isn't required after all.
3473 If C<gv> is a completely empty typeglob, it is deleted from the stash.
3475 If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3476 sub, the typeglob is replaced with a scalar-reference placeholder that
3477 more compactly represents the same thing.
3483 Perl_gv_try_downgrade(pTHX_ GV *gv)
3489 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
3491 /* XXX Why and where does this leave dangling pointers during global
3493 if (PL_phase == PERL_PHASE_DESTRUCT) return;
3495 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
3496 !SvOBJECT(gv) && !SvREADONLY(gv) &&
3497 isGV_with_GP(gv) && GvGP(gv) &&
3498 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
3499 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
3500 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
3502 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3504 if (SvMAGICAL(gv)) {
3506 /* only backref magic is allowed */
3507 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3509 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3510 if (mg->mg_type != PERL_MAGIC_backref)
3516 HEK *gvnhek = GvNAME_HEK(gv);
3517 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
3518 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 &&
3519 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
3520 CvSTASH(cv) == stash && !CvNAMED(cv) && CvGV(cv) == gv &&
3521 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3522 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3523 (namehek = GvNAME_HEK(gv)) &&
3524 (gvp = hv_fetchhek(stash, namehek, 0)) &&
3526 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
3527 const bool imported = !!GvIMPORTED_CV(gv);
3531 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
3532 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3533 STRUCT_OFFSET(XPVIV, xiv_iv));
3534 SvRV_set(gv, value);
3539 Perl_gv_override(pTHX_ const char * const name, const STRLEN len)
3541 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV);
3543 PERL_ARGS_ASSERT_GV_OVERRIDE;
3544 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv;
3545 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE);
3546 gv = gvp ? *gvp : NULL;
3547 if (gv && !isGV(gv)) {
3548 if (!SvPCS_IMPORTED(gv)) return NULL;
3549 gv_init(gv, PL_globalstash, name, len, 0);
3552 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL;
3558 core_xsub(pTHX_ CV* cv)
3561 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3567 * c-indentation-style: bsd
3569 * indent-tabs-mode: nil
3572 * ex: set ts=8 sts=4 sw=4 et: