3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 * 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 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 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,'
23 A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
24 It is a structure that holds a pointer to a scalar, an array, a hash etc,
25 corresponding to $foo, @foo, %foo.
27 GVs are usually found as values in stashes (symbol table hashes) where
28 Perl stores its global variables.
37 static const char S_autoload[] = "AUTOLOAD";
38 static const STRLEN S_autolen = sizeof(S_autoload)-1;
41 #ifdef PERL_DONT_CREATE_GVSV
43 Perl_gv_SVadd(pTHX_ GV *gv)
45 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
46 Perl_croak(aTHX_ "Bad symbol for scalar");
54 Perl_gv_AVadd(pTHX_ register GV *gv)
56 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
57 Perl_croak(aTHX_ "Bad symbol for array");
64 Perl_gv_HVadd(pTHX_ register GV *gv)
66 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
67 Perl_croak(aTHX_ "Bad symbol for hash");
74 Perl_gv_IOadd(pTHX_ register GV *gv)
77 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) {
80 * if it walks like a dirhandle, then let's assume that
81 * this is a dirhandle.
83 const char * const fh =
84 PL_op->op_type == OP_READDIR ||
85 PL_op->op_type == OP_TELLDIR ||
86 PL_op->op_type == OP_SEEKDIR ||
87 PL_op->op_type == OP_REWINDDIR ||
88 PL_op->op_type == OP_CLOSEDIR ?
89 "dirhandle" : "filehandle";
90 Perl_croak(aTHX_ "Bad symbol for %s", fh);
94 #ifdef GV_UNIQUE_CHECK
96 Perl_croak(aTHX_ "Bad symbol for filehandle (GV is unique)");
105 Perl_gv_fetchfile(pTHX_ const char *name)
107 return gv_fetchfile_flags(name, strlen(name), 0);
111 Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
117 const STRLEN tmplen = namelen + 2;
120 PERL_UNUSED_ARG(flags);
125 if (tmplen <= sizeof smallbuf)
128 Newx(tmpbuf, tmplen, char);
129 /* This is where the debugger's %{"::_<$filename"} hash is created */
132 memcpy(tmpbuf + 2, name, namelen);
133 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
135 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
136 #ifdef PERL_DONT_CREATE_GVSV
137 GvSV(gv) = newSVpvn(name, namelen);
139 sv_setpvn(GvSV(gv), name, namelen);
142 hv_magic(GvHVn(gv_AVadd(gv)), NULL, PERL_MAGIC_dbfile);
144 if (tmpbuf != smallbuf)
150 =for apidoc gv_const_sv
152 If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
153 inlining, or C<gv> is a placeholder reference that would be promoted to such
154 a typeglob, then returns the value returned by the sub. Otherwise, returns
161 Perl_gv_const_sv(pTHX_ GV *gv)
163 if (SvTYPE(gv) == SVt_PVGV)
164 return cv_const_sv(GvCVu(gv));
165 return SvROK(gv) ? SvRV(gv) : NULL;
169 Perl_newGP(pTHX_ GV *const gv)
172 const char *const file
173 = (PL_curcop && CopFILE(PL_curcop)) ? CopFILE(PL_curcop) : "";
174 STRLEN len = strlen(file);
177 PERL_HASH(hash, file, len);
181 #ifndef PERL_DONT_CREATE_GVSV
182 gp->gp_sv = newSV(0);
185 gp->gp_line = PL_curcop ? CopLINE(PL_curcop) : 0;
186 /* XXX Ideally this cast would be replaced with a change to const char*
188 gp->gp_file_hek = share_hek(file, len, hash);
196 Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
199 const U32 old_type = SvTYPE(gv);
200 const bool doproto = old_type > SVt_NULL;
201 const char * const proto = (doproto && SvPOK(gv)) ? SvPVX_const(gv) : NULL;
202 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
203 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
205 assert (!(proto && has_constant));
208 /* The constant has to be a simple scalar type. */
209 switch (SvTYPE(has_constant)) {
215 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
216 sv_reftype(has_constant, 0));
224 if (old_type < SVt_PVGV) {
225 if (old_type >= SVt_PV)
227 sv_upgrade((SV*)gv, SVt_PVGV);
235 Safefree(SvPVX_mutable(gv));
240 GvGP(gv) = Perl_newGP(aTHX_ gv);
243 Perl_sv_add_backref(aTHX_ (SV*)stash, (SV*)gv);
244 gv_name_set(gv, name, len, GV_ADD);
245 if (multi || doproto) /* doproto means it _was_ mentioned */
247 if (doproto) { /* Replicate part of newSUB here. */
250 /* newCONSTSUB takes ownership of the reference from us. */
251 GvCV(gv) = newCONSTSUB(stash, name, has_constant);
252 /* If this reference was a copy of another, then the subroutine
253 must have been "imported", by a Perl space assignment to a GV
254 from a reference to CV. */
255 if (exported_constant)
256 GvIMPORTED_CV_on(gv);
258 (void) start_subparse(0,0); /* Create empty CV in compcv. */
259 GvCV(gv) = PL_compcv;
265 CvFILE_set_from_cop(GvCV(gv), PL_curcop);
266 CvSTASH(GvCV(gv)) = PL_curstash;
268 sv_setpv((SV*)GvCV(gv), proto);
275 S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
287 #ifdef PERL_DONT_CREATE_GVSV
300 =for apidoc gv_fetchmeth
302 Returns the glob with the given C<name> and a defined subroutine or
303 C<NULL>. The glob lives in the given C<stash>, or in the stashes
304 accessible via @ISA and UNIVERSAL::.
306 The argument C<level> should be either 0 or -1. If C<level==0>, as a
307 side-effect creates a glob with the given C<name> in the given C<stash>
308 which in the case of success contains an alias for the subroutine, and sets
309 up caching info for this glob. Similarly for all the searched stashes.
311 This function grants C<"SUPER"> token as a postfix of the stash name. The
312 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
313 visible to Perl code. So when calling C<call_sv>, you should not use
314 the GV directly; instead, you should use the method's CV, which can be
315 obtained from the GV with the C<GvCV> macro.
321 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
330 HV* lastchance = NULL;
332 /* UNIVERSAL methods should be callable without a stash */
334 level = -1; /* probably appropriate */
335 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
339 hvname = HvNAME_get(stash);
342 "Can't use anonymous symbol table for method lookup");
344 if ((level > 100) || (level < -100))
345 Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
348 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
350 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
355 if (SvTYPE(topgv) != SVt_PVGV)
356 gv_init(topgv, stash, name, len, TRUE);
357 if ((cv = GvCV(topgv))) {
358 /* If genuine method or valid cache entry, use it */
359 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
361 /* Stale cached entry: junk it */
363 GvCV(topgv) = cv = NULL;
366 else if (GvCVGEN(topgv) == PL_sub_generation)
367 return 0; /* cache indicates sub doesn't exist */
370 gvp = (GV**)hv_fetchs(stash, "ISA", FALSE);
371 av = (gvp && (gv = *gvp) && isGV_with_GP(gv)) ? GvAV(gv) : NULL;
373 /* create and re-create @.*::SUPER::ISA on demand */
374 if (!av || !SvMAGIC(av)) {
375 STRLEN packlen = HvNAMELEN_get(stash);
377 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
381 basestash = gv_stashpvn(hvname, packlen, GV_ADD);
382 gvp = (GV**)hv_fetchs(basestash, "ISA", FALSE);
383 if (gvp && (gv = *gvp) && isGV_with_GP(gv) && (av = GvAV(gv))) {
384 gvp = (GV**)hv_fetchs(stash, "ISA", TRUE);
385 if (!gvp || !(gv = *gvp))
386 Perl_croak(aTHX_ "Cannot create %s::ISA", hvname);
387 if (SvTYPE(gv) != SVt_PVGV)
388 gv_init(gv, stash, "ISA", 3, TRUE);
389 SvREFCNT_dec(GvAV(gv));
390 GvAV(gv) = (AV*)SvREFCNT_inc_simple(av);
396 SV** svp = AvARRAY(av);
397 /* NOTE: No support for tied ISA */
398 I32 items = AvFILLp(av) + 1;
400 SV* const sv = *svp++;
401 HV* const basestash = gv_stashsv(sv, 0);
403 if (ckWARN(WARN_MISC))
404 Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
408 gv = gv_fetchmeth(basestash, name, len,
409 (level >= 0) ? level + 1 : level - 1);
415 /* if at top level, try UNIVERSAL */
417 if (level == 0 || level == -1) {
418 lastchance = gv_stashpvs("UNIVERSAL", 0);
421 if ((gv = gv_fetchmeth(lastchance, name, len,
422 (level >= 0) ? level + 1 : level - 1)))
426 * Cache method in topgv if:
427 * 1. topgv has no synonyms (else inheritance crosses wires)
428 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
431 GvREFCNT(topgv) == 1 &&
433 (CvROOT(cv) || CvXSUB(cv)))
435 if ((cv = GvCV(topgv)))
437 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
438 GvCVGEN(topgv) = PL_sub_generation;
442 else if (topgv && GvREFCNT(topgv) == 1) {
443 /* cache the fact that the method is not defined */
444 GvCVGEN(topgv) = PL_sub_generation;
453 =for apidoc gv_fetchmeth_autoload
455 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
456 Returns a glob for the subroutine.
458 For an autoloaded subroutine without a GV, will create a GV even
459 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
460 of the result may be zero.
466 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
468 GV *gv = gv_fetchmeth(stash, name, len, level);
475 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
476 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
478 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
481 if (!(CvROOT(cv) || CvXSUB(cv)))
483 /* Have an autoload */
484 if (level < 0) /* Cannot do without a stub */
485 gv_fetchmeth(stash, name, len, 0);
486 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
495 =for apidoc gv_fetchmethod_autoload
497 Returns the glob which contains the subroutine to call to invoke the method
498 on the C<stash>. In fact in the presence of autoloading this may be the
499 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
502 The third parameter of C<gv_fetchmethod_autoload> determines whether
503 AUTOLOAD lookup is performed if the given method is not present: non-zero
504 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
505 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
506 with a non-zero C<autoload> parameter.
508 These functions grant C<"SUPER"> token as a prefix of the method name. Note
509 that if you want to keep the returned glob for a long time, you need to
510 check for it being "AUTOLOAD", since at the later time the call may load a
511 different subroutine due to $AUTOLOAD changing its value. Use the glob
512 created via a side effect to do this.
514 These functions have the same side-effects and as C<gv_fetchmeth> with
515 C<level==0>. C<name> should be writable if contains C<':'> or C<'
516 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
517 C<call_sv> apply equally to these functions.
523 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
526 register const char *nend;
527 const char *nsplit = NULL;
531 if (stash && SvTYPE(stash) < SVt_PVHV)
534 for (nend = name; *nend; nend++) {
537 else if (*nend == ':' && *(nend + 1) == ':')
541 const char * const origname = name;
545 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
546 /* ->SUPER::method should really be looked up in original stash */
547 SV * const tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
548 CopSTASHPV(PL_curcop)));
549 /* __PACKAGE__::SUPER stash should be autovivified */
550 stash = gv_stashpvn(SvPVX_const(tmpstr), SvCUR(tmpstr), GV_ADD);
551 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
552 origname, HvNAME_get(stash), name) );
555 /* don't autovifify if ->NoSuchStash::method */
556 stash = gv_stashpvn(origname, nsplit - origname, 0);
558 /* however, explicit calls to Pkg::SUPER::method may
559 happen, and may require autovivification to work */
560 if (!stash && (nsplit - origname) >= 7 &&
561 strnEQ(nsplit - 7, "::SUPER", 7) &&
562 gv_stashpvn(origname, nsplit - origname - 7, 0))
563 stash = gv_stashpvn(origname, nsplit - origname, GV_ADD);
568 gv = gv_fetchmeth(stash, name, nend - name, 0);
570 if (strEQ(name,"import") || strEQ(name,"unimport"))
571 gv = (GV*)&PL_sv_yes;
573 gv = gv_autoload4(ostash, name, nend - name, TRUE);
576 CV* const cv = GvCV(gv);
577 if (!CvROOT(cv) && !CvXSUB(cv)) {
585 if (GvCV(stubgv) != cv) /* orphaned import */
588 autogv = gv_autoload4(GvSTASH(stubgv),
589 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
599 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
607 const char *packname = "";
608 STRLEN packname_len = 0;
610 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
613 if (SvTYPE(stash) < SVt_PVHV) {
614 packname = SvPV_const((SV*)stash, packname_len);
618 packname = HvNAME_get(stash);
619 packname_len = HvNAMELEN_get(stash);
622 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
626 if (!(CvROOT(cv) || CvXSUB(cv)))
630 * Inheriting AUTOLOAD for non-methods works ... for now.
632 if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
633 && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)
635 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
636 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
637 packname, (int)len, name);
640 /* rather than lookup/init $AUTOLOAD here
641 * only to have the XSUB do another lookup for $AUTOLOAD
642 * and split that value on the last '::',
643 * pass along the same data via some unused fields in the CV
646 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
652 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
653 * The subroutine's original name may not be "AUTOLOAD", so we don't
654 * use that, but for lack of anything better we will use the sub's
655 * original package to look up $AUTOLOAD.
657 varstash = GvSTASH(CvGV(cv));
658 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
662 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
663 #ifdef PERL_DONT_CREATE_GVSV
664 GvSV(vargv) = newSV(0);
668 varsv = GvSVn(vargv);
669 sv_setpvn(varsv, packname, packname_len);
670 sv_catpvs(varsv, "::");
671 sv_catpvn(varsv, name, len);
676 /* require_tie_mod() internal routine for requiring a module
677 * that implements the logic of automatical ties like %! and %-
679 * The "gv" parameter should be the glob.
680 * "varpv" holds the name of the var, used for error messages.
681 * "namesv" holds the module name. Its refcount will be decremented.
682 * "methpv" holds the method name to test for to check that things
683 * are working reasonably close to as expected.
684 * "flags": if flag & 1 then save the scalar before loading.
685 * For the protection of $! to work (it is set by this routine)
686 * the sv slot must already be magicalized.
689 S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
692 HV* stash = gv_stashsv(namesv, 0);
694 if (!stash || !(gv_fetchmethod(stash, methpv))) {
695 SV *module = newSVsv(namesv);
696 char varname = *varpv; /* varpv might be clobbered by load_module,
697 so save it. For the moment it's always
703 PUSHSTACKi(PERLSI_MAGIC);
704 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
708 stash = gv_stashsv(namesv, 0);
710 Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" is not available",
711 varname, SVfARG(namesv));
712 else if (!gv_fetchmethod(stash, methpv))
713 Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" does not support method %s",
714 varname, SVfARG(namesv), methpv);
716 SvREFCNT_dec(namesv);
721 =for apidoc gv_stashpv
723 Returns a pointer to the stash for a specified package. Uses C<strlen> to
724 determine the length of C<name>, then calls C<gv_stashpvn()>.
730 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
732 return gv_stashpvn(name, strlen(name), create);
736 =for apidoc gv_stashpvn
738 Returns a pointer to the stash for a specified package. The C<namelen>
739 parameter indicates the length of the C<name>, in bytes. C<flags> is passed
740 to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
741 created if it does not already exist. If the package does not exist and
742 C<flags> is 0 (or any other setting that does not create packages) then NULL
750 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
757 if (namelen + 2 <= sizeof smallbuf)
760 Newx(tmpbuf, namelen + 2, char);
761 Copy(name,tmpbuf,namelen,char);
762 tmpbuf[namelen++] = ':';
763 tmpbuf[namelen++] = ':';
764 tmpgv = gv_fetchpvn_flags(tmpbuf, namelen, flags, SVt_PVHV);
765 if (tmpbuf != smallbuf)
770 GvHV(tmpgv) = newHV();
772 if (!HvNAME_get(stash))
773 hv_name_set(stash, name, namelen, 0);
778 =for apidoc gv_stashsv
780 Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
786 Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
789 const char * const ptr = SvPV_const(sv,len);
790 return gv_stashpvn(ptr, len, flags);
795 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
796 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
800 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
802 const char * const nambeg = SvPV_const(name, len);
803 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
807 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
811 register const char *name = nambeg;
812 register GV *gv = NULL;
815 register const char *name_cursor;
817 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
818 const I32 no_expand = flags & GV_NOEXPAND;
819 const I32 add = flags & ~GV_NOADD_MASK;
820 const char *const name_end = nambeg + full_len;
821 const char *const name_em1 = name_end - 1;
823 if (flags & GV_NOTQUAL) {
824 /* Caller promised that there is no stash, so we can skip the check. */
829 if (full_len > 2 && *name == '*' && isALPHA(name[1])) {
830 /* accidental stringify on a GV? */
834 for (name_cursor = name; name_cursor < name_end; name_cursor++) {
835 if ((*name_cursor == ':' && name_cursor < name_em1
836 && name_cursor[1] == ':')
837 || (*name_cursor == '\'' && name_cursor[1]))
841 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
844 len = name_cursor - name;
849 if (len + 2 <= (I32)sizeof (smallbuf))
852 Newx(tmpbuf, len+2, char);
853 Copy(name, tmpbuf, len, char);
856 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
857 gv = gvp ? *gvp : NULL;
858 if (gv && gv != (GV*)&PL_sv_undef) {
859 if (SvTYPE(gv) != SVt_PVGV)
860 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
864 if (tmpbuf != smallbuf)
866 if (!gv || gv == (GV*)&PL_sv_undef)
869 if (!(stash = GvHV(gv)))
870 stash = GvHV(gv) = newHV();
872 if (!HvNAME_get(stash))
873 hv_name_set(stash, nambeg, name_cursor - nambeg, 0);
876 if (*name_cursor == ':')
880 if (name == name_end)
881 return gv ? gv : (GV*)*hv_fetchs(PL_defstash, "main::", TRUE);
884 len = name_cursor - name;
886 /* No stash in name, so see how we can default */
890 if (len && isIDFIRST_lazy(name)) {
899 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
900 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
901 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
905 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
910 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
911 && name[3] == 'I' && name[4] == 'N')
915 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
916 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
917 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
921 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
922 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
930 else if (IN_PERL_COMPILETIME) {
932 if (add && (PL_hints & HINT_STRICT_VARS) &&
933 sv_type != SVt_PVCV &&
934 sv_type != SVt_PVGV &&
935 sv_type != SVt_PVFM &&
936 sv_type != SVt_PVIO &&
937 !(len == 1 && sv_type == SVt_PV &&
938 (*name == 'a' || *name == 'b')) )
940 gvp = (GV**)hv_fetch(stash,name,len,0);
942 *gvp == (GV*)&PL_sv_undef ||
943 SvTYPE(*gvp) != SVt_PVGV)
947 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
948 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
949 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
951 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
952 sv_type == SVt_PVAV ? '@' :
953 sv_type == SVt_PVHV ? '%' : '$',
956 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
962 stash = CopSTASH(PL_curcop);
968 /* By this point we should have a stash and a name */
972 SV * const err = Perl_mess(aTHX_
973 "Global symbol \"%s%s\" requires explicit package name",
974 (sv_type == SVt_PV ? "$"
975 : sv_type == SVt_PVAV ? "@"
976 : sv_type == SVt_PVHV ? "%"
979 if (USE_UTF8_IN_NAMES)
982 gv = gv_fetchpvn_flags("<none>::", 8, GV_ADDMULTI, SVt_PVHV);
984 /* symbol table under destruction */
993 if (!SvREFCNT(stash)) /* symbol table under destruction */
996 gvp = (GV**)hv_fetch(stash,name,len,add);
997 if (!gvp || *gvp == (GV*)&PL_sv_undef)
1000 if (SvTYPE(gv) == SVt_PVGV) {
1003 gv_init_sv(gv, sv_type);
1004 if (len == 1 && (sv_type == SVt_PVHV || sv_type == SVt_PVGV)) {
1006 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1007 else if (*name == '-' || *name == '+')
1008 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "FETCH", 0);
1012 } else if (no_init) {
1014 } else if (no_expand && SvROK(gv)) {
1018 /* Adding a new symbol */
1020 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
1021 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
1022 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
1023 gv_init_sv(gv, sv_type);
1025 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
1026 : (PL_dowarn & G_WARN_ON ) ) )
1029 /* set up magic where warranted */
1034 /* Nothing else to do.
1035 The compiler will probably turn the switch statement into a
1036 branch table. Make sure we avoid even that small overhead for
1037 the common case of lower case variable names. */
1041 const char * const name2 = name + 1;
1044 if (strEQ(name2, "RGV")) {
1045 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1047 else if (strEQ(name2, "RGVOUT")) {
1052 if (strnEQ(name2, "XPORT", 5))
1056 if (strEQ(name2, "SA")) {
1057 AV* const av = GvAVn(gv);
1059 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, NULL, 0);
1060 /* NOTE: No support for tied ISA */
1061 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
1062 && AvFILLp(av) == -1)
1065 av_push(av, newSVpvn(pname = "NDBM_File",9));
1066 gv_stashpvn(pname, 9, GV_ADD);
1067 av_push(av, newSVpvn(pname = "DB_File",7));
1068 gv_stashpvn(pname, 7, GV_ADD);
1069 av_push(av, newSVpvn(pname = "GDBM_File",9));
1070 gv_stashpvn(pname, 9, GV_ADD);
1071 av_push(av, newSVpvn(pname = "SDBM_File",9));
1072 gv_stashpvn(pname, 9, GV_ADD);
1073 av_push(av, newSVpvn(pname = "ODBM_File",9));
1074 gv_stashpvn(pname, 9, GV_ADD);
1079 if (strEQ(name2, "VERLOAD")) {
1080 HV* const hv = GvHVn(gv);
1082 hv_magic(hv, NULL, PERL_MAGIC_overload);
1086 if (strEQ(name2, "IG")) {
1090 Newxz(PL_psig_ptr, SIG_SIZE, SV*);
1091 Newxz(PL_psig_name, SIG_SIZE, SV*);
1092 Newxz(PL_psig_pend, SIG_SIZE, int);
1096 hv_magic(hv, NULL, PERL_MAGIC_sig);
1097 for (i = 1; i < SIG_SIZE; i++) {
1098 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1100 sv_setsv(*init, &PL_sv_undef);
1102 PL_psig_name[i] = 0;
1103 PL_psig_pend[i] = 0;
1108 if (strEQ(name2, "ERSION"))
1111 case '\003': /* $^CHILD_ERROR_NATIVE */
1112 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1115 case '\005': /* $^ENCODING */
1116 if (strEQ(name2, "NCODING"))
1119 case '\015': /* $^MATCH */
1120 if (strEQ(name2, "ATCH"))
1122 case '\017': /* $^OPEN */
1123 if (strEQ(name2, "PEN"))
1126 case '\020': /* $^PREMATCH $^POSTMATCH */
1127 if (strEQ(name2, "REMATCH") || strEQ(name2, "OSTMATCH"))
1129 case '\024': /* ${^TAINT} */
1130 if (strEQ(name2, "AINT"))
1133 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1134 if (strEQ(name2, "NICODE"))
1136 if (strEQ(name2, "TF8LOCALE"))
1138 if (strEQ(name2, "TF8CACHE"))
1141 case '\027': /* $^WARNING_BITS */
1142 if (strEQ(name2, "ARNING_BITS"))
1155 /* ensures variable is only digits */
1156 /* ${"1foo"} fails this test (and is thus writeable) */
1157 /* added by japhy, but borrowed from is_gv_magical */
1158 const char *end = name + len;
1159 while (--end > name) {
1160 if (!isDIGIT(*end)) return gv;
1167 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1168 be case '\0' in this switch statement (ie a default case) */
1174 sv_type == SVt_PVAV ||
1175 sv_type == SVt_PVHV ||
1176 sv_type == SVt_PVCV ||
1177 sv_type == SVt_PVFM ||
1180 PL_sawampersand = TRUE;
1184 sv_setpv(GvSVn(gv),PL_chopset);
1188 #ifdef COMPLEX_STATUS
1189 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1195 /* If %! has been used, automatically load Errno.pm. */
1197 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1199 /* magicalization must be done before require_tie_mod is called */
1200 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1201 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1206 GvMULTI_on(gv); /* no used once warnings here */
1208 AV* const av = GvAVn(gv);
1209 SV* const avc = (*name == '+') ? (SV*)av : NULL;
1211 sv_magic((SV*)av, avc, PERL_MAGIC_regdata, NULL, 0);
1212 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1214 SvREADONLY_on(GvSVn(gv));
1217 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1218 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "FETCH", 0);
1224 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1225 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1226 "$%c is no longer supported", *name);
1229 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1232 case '\010': /* $^H */
1234 HV *const hv = GvHVn(gv);
1235 hv_magic(hv, NULL, PERL_MAGIC_hints);
1238 case '\023': /* $^S */
1249 SvREADONLY_on(GvSVn(gv));
1264 case '\001': /* $^A */
1265 case '\003': /* $^C */
1266 case '\004': /* $^D */
1267 case '\005': /* $^E */
1268 case '\006': /* $^F */
1269 case '\011': /* $^I, NOT \t in EBCDIC */
1270 case '\016': /* $^N */
1271 case '\017': /* $^O */
1272 case '\020': /* $^P */
1273 case '\024': /* $^T */
1274 case '\027': /* $^W */
1276 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1279 case '\014': /* $^L */
1280 sv_setpvn(GvSVn(gv),"\f",1);
1281 PL_formfeed = GvSVn(gv);
1284 sv_setpvn(GvSVn(gv),"\034",1);
1288 SV * const sv = GvSVn(gv);
1289 if (!sv_derived_from(PL_patchlevel, "version"))
1290 upg_version(PL_patchlevel);
1291 GvSV(gv) = vnumify(PL_patchlevel);
1292 SvREADONLY_on(GvSV(gv));
1296 case '\026': /* $^V */
1298 SV * const sv = GvSVn(gv);
1299 GvSV(gv) = new_version(PL_patchlevel);
1300 SvREADONLY_on(GvSV(gv));
1310 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1314 const HV * const hv = GvSTASH(gv);
1319 sv_setpv(sv, prefix ? prefix : "");
1321 name = HvNAME_get(hv);
1323 namelen = HvNAMELEN_get(hv);
1329 if (keepmain || strNE(name, "main")) {
1330 sv_catpvn(sv,name,namelen);
1333 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1337 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1339 const GV * const egv = GvEGV(gv);
1340 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1348 IO * const io = (IO*)newSV_type(SVt_PVIO);
1349 /* This used to read SvREFCNT(io) = 1;
1350 It's not clear why the reference count needed an explicit reset. NWC
1352 assert (SvREFCNT(io) == 1);
1354 /* Clear the stashcache because a new IO could overrule a package name */
1355 hv_clear(PL_stashcache);
1356 iogv = gv_fetchpvs("FileHandle::", 0, SVt_PVHV);
1357 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1358 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1359 iogv = gv_fetchpvs("IO::Handle::", GV_ADD, SVt_PVHV);
1360 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1365 Perl_gv_check(pTHX_ const HV *stash)
1370 if (!HvARRAY(stash))
1372 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1374 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1377 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1378 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1380 if (hv != PL_defstash && hv != stash)
1381 gv_check(hv); /* nested package */
1383 else if (isALPHA(*HeKEY(entry))) {
1385 gv = (GV*)HeVAL(entry);
1386 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1389 /* performance hack: if filename is absolute and it's a standard
1390 * module, don't bother warning */
1391 #ifdef MACOS_TRADITIONAL
1392 # define LIB_COMPONENT ":lib:"
1394 # define LIB_COMPONENT "/lib/"
1397 && PERL_FILE_IS_ABSOLUTE(file)
1398 && (instr(file, LIB_COMPONENT) || instr(file, ".pm")))
1402 CopLINE_set(PL_curcop, GvLINE(gv));
1404 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1406 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1408 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1409 "Name \"%s::%s\" used only once: possible typo",
1410 HvNAME_get(stash), GvNAME(gv));
1417 Perl_newGVgen(pTHX_ const char *pack)
1420 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1424 /* hopefully this is only called on local symbol table entries */
1427 Perl_gp_ref(pTHX_ GP *gp)
1435 /* multi-named GPs cannot be used for method cache */
1436 SvREFCNT_dec(gp->gp_cv);
1441 /* Adding a new name to a subroutine invalidates method cache */
1442 PL_sub_generation++;
1449 Perl_gp_free(pTHX_ GV *gv)
1454 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
1456 if (gp->gp_refcnt == 0) {
1457 if (ckWARN_d(WARN_INTERNAL))
1458 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1459 "Attempt to free unreferenced glob pointers"
1460 pTHX__FORMAT pTHX__VALUE);
1464 /* Deleting the name of a subroutine invalidates method cache */
1465 PL_sub_generation++;
1467 if (--gp->gp_refcnt > 0) {
1468 if (gp->gp_egv == gv)
1474 if (gp->gp_file_hek)
1475 unshare_hek(gp->gp_file_hek);
1476 SvREFCNT_dec(gp->gp_sv);
1477 SvREFCNT_dec(gp->gp_av);
1478 /* FIXME - another reference loop GV -> symtab -> GV ?
1479 Somehow gp->gp_hv can end up pointing at freed garbage. */
1480 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1481 const char *hvname = HvNAME_get(gp->gp_hv);
1482 if (PL_stashcache && hvname)
1483 hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv),
1485 SvREFCNT_dec(gp->gp_hv);
1487 SvREFCNT_dec(gp->gp_io);
1488 SvREFCNT_dec(gp->gp_cv);
1489 SvREFCNT_dec(gp->gp_form);
1496 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1498 AMT * const amtp = (AMT*)mg->mg_ptr;
1499 PERL_UNUSED_ARG(sv);
1501 if (amtp && AMT_AMAGIC(amtp)) {
1503 for (i = 1; i < NofAMmeth; i++) {
1504 CV * const cv = amtp->table[i];
1506 SvREFCNT_dec((SV *) cv);
1507 amtp->table[i] = NULL;
1514 /* Updates and caches the CV's */
1517 Perl_Gv_AMupdate(pTHX_ HV *stash)
1520 MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1524 const AMT * const amtp = (AMT*)mg->mg_ptr;
1525 if (amtp->was_ok_am == PL_amagic_generation
1526 && amtp->was_ok_sub == PL_sub_generation) {
1527 return (bool)AMT_OVERLOADED(amtp);
1529 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1532 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1535 amt.was_ok_am = PL_amagic_generation;
1536 amt.was_ok_sub = PL_sub_generation;
1537 amt.fallback = AMGfallNO;
1541 int filled = 0, have_ovl = 0;
1544 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1546 /* Try to find via inheritance. */
1547 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1548 SV * const sv = gv ? GvSV(gv) : NULL;
1552 lim = DESTROY_amg; /* Skip overloading entries. */
1553 #ifdef PERL_DONT_CREATE_GVSV
1555 NOOP; /* Equivalent to !SvTRUE and !SvOK */
1558 else if (SvTRUE(sv))
1559 amt.fallback=AMGfallYES;
1561 amt.fallback=AMGfallNEVER;
1563 for (i = 1; i < lim; i++)
1564 amt.table[i] = NULL;
1565 for (; i < NofAMmeth; i++) {
1566 const char * const cooky = PL_AMG_names[i];
1567 /* Human-readable form, for debugging: */
1568 const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1569 const STRLEN l = strlen(cooky);
1571 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1572 cp, HvNAME_get(stash)) );
1573 /* don't fill the cache while looking up!
1574 Creation of inheritance stubs in intermediate packages may
1575 conflict with the logic of runtime method substitution.
1576 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1577 then we could have created stubs for "(+0" in A and C too.
1578 But if B overloads "bool", we may want to use it for
1579 numifying instead of C's "+0". */
1580 if (i >= DESTROY_amg)
1581 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1582 else /* Autoload taken care of below */
1583 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1585 if (gv && (cv = GvCV(gv))) {
1587 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1588 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1589 /* This is a hack to support autoloading..., while
1590 knowing *which* methods were declared as overloaded. */
1591 /* GvSV contains the name of the method. */
1593 SV *gvsv = GvSV(gv);
1595 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1596 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1597 (void*)GvSV(gv), cp, hvname) );
1598 if (!gvsv || !SvPOK(gvsv)
1599 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1602 /* Can be an import stub (created by "can"). */
1603 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1604 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1605 "in package \"%.256s\"",
1606 (GvCVGEN(gv) ? "Stub found while resolving"
1610 cv = GvCV(gv = ngv);
1612 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1613 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1614 GvNAME(CvGV(cv))) );
1616 if (i < DESTROY_amg)
1618 } else if (gv) { /* Autoloaded... */
1622 amt.table[i]=(CV*)SvREFCNT_inc_simple(cv);
1625 AMT_AMAGIC_on(&amt);
1627 AMT_OVERLOADED_on(&amt);
1628 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1629 (char*)&amt, sizeof(AMT));
1633 /* Here we have no table: */
1635 AMT_AMAGIC_off(&amt);
1636 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1637 (char*)&amt, sizeof(AMTS));
1643 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1649 if (!stash || !HvNAME_get(stash))
1651 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1655 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1658 amtp = (AMT*)mg->mg_ptr;
1659 if ( amtp->was_ok_am != PL_amagic_generation
1660 || amtp->was_ok_sub != PL_sub_generation )
1662 if (AMT_AMAGIC(amtp)) {
1663 CV * const ret = amtp->table[id];
1664 if (ret && isGV(ret)) { /* Autoloading stab */
1665 /* Passing it through may have resulted in a warning
1666 "Inherited AUTOLOAD for a non-method deprecated", since
1667 our caller is going through a function call, not a method call.
1668 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1669 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1682 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1687 CV **cvp=NULL, **ocvp=NULL;
1688 AMT *amtp=NULL, *oamtp=NULL;
1689 int off = 0, off1, lr = 0, notfound = 0;
1690 int postpr = 0, force_cpy = 0;
1691 int assign = AMGf_assign & flags;
1692 const int assignshift = assign ? 1 : 0;
1697 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1698 && (stash = SvSTASH(SvRV(left)))
1699 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1700 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1701 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1703 && ((cv = cvp[off=method+assignshift])
1704 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1710 cv = cvp[off=method])))) {
1711 lr = -1; /* Call method for left argument */
1713 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1716 /* look for substituted methods */
1717 /* In all the covered cases we should be called with assign==0. */
1721 if ((cv = cvp[off=add_ass_amg])
1722 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1723 right = &PL_sv_yes; lr = -1; assign = 1;
1728 if ((cv = cvp[off = subtr_ass_amg])
1729 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1730 right = &PL_sv_yes; lr = -1; assign = 1;
1734 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1737 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1740 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1743 (void)((cv = cvp[off=bool__amg])
1744 || (cv = cvp[off=numer_amg])
1745 || (cv = cvp[off=string_amg]));
1751 * SV* ref causes confusion with the interpreter variable of
1754 SV* const tmpRef=SvRV(left);
1755 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1757 * Just to be extra cautious. Maybe in some
1758 * additional cases sv_setsv is safe, too.
1760 SV* const newref = newSVsv(tmpRef);
1761 SvOBJECT_on(newref);
1762 /* As a bit of a source compatibility hack, SvAMAGIC() and
1763 friends dereference an RV, to behave the same was as when
1764 overloading was stored on the reference, not the referant.
1765 Hence we can't use SvAMAGIC_on()
1767 SvFLAGS(newref) |= SVf_AMAGIC;
1768 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1774 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1775 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1776 SV* const nullsv=sv_2mortal(newSViv(0));
1778 SV* const lessp = amagic_call(left,nullsv,
1779 lt_amg,AMGf_noright);
1780 logic = SvTRUE(lessp);
1782 SV* const lessp = amagic_call(left,nullsv,
1783 ncmp_amg,AMGf_noright);
1784 logic = (SvNV(lessp) < 0);
1787 if (off==subtr_amg) {
1798 if ((cv = cvp[off=subtr_amg])) {
1800 left = sv_2mortal(newSViv(0));
1805 case iter_amg: /* XXXX Eventually should do to_gv. */
1807 return NULL; /* Delegate operation to standard mechanisms. */
1815 return left; /* Delegate operation to standard mechanisms. */
1820 if (!cv) goto not_found;
1821 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1822 && (stash = SvSTASH(SvRV(right)))
1823 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1824 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1825 ? (amtp = (AMT*)mg->mg_ptr)->table
1827 && (cv = cvp[off=method])) { /* Method for right
1830 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1831 && (cvp=ocvp) && (lr = -1))
1832 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1833 && !(flags & AMGf_unary)) {
1834 /* We look for substitution for
1835 * comparison operations and
1837 if (method==concat_amg || method==concat_ass_amg
1838 || method==repeat_amg || method==repeat_ass_amg) {
1839 return NULL; /* Delegate operation to string conversion */
1849 postpr = 1; off=ncmp_amg; break;
1856 postpr = 1; off=scmp_amg; break;
1858 if (off != -1) cv = cvp[off];
1863 not_found: /* No method found, either report or croak */
1884 return left; /* Delegate operation to standard mechanisms. */
1887 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1888 notfound = 1; lr = -1;
1889 } else if (cvp && (cv=cvp[nomethod_amg])) {
1890 notfound = 1; lr = 1;
1891 } else if ((amtp && amtp->fallback >= AMGfallYES) && !DEBUG_o_TEST) {
1892 /* Skip generating the "no method found" message. */
1896 if (off==-1) off=method;
1897 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1898 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1899 AMG_id2name(method + assignshift),
1900 (flags & AMGf_unary ? " " : "\n\tleft "),
1902 "in overloaded package ":
1903 "has no overloaded magic",
1905 HvNAME_get(SvSTASH(SvRV(left))):
1908 ",\n\tright argument in overloaded package ":
1911 : ",\n\tright argument has no overloaded magic"),
1913 HvNAME_get(SvSTASH(SvRV(right))):
1915 if (amtp && amtp->fallback >= AMGfallYES) {
1916 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1918 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
1922 force_cpy = force_cpy || assign;
1927 DEBUG_o(Perl_deb(aTHX_
1928 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1930 method+assignshift==off? "" :
1932 method+assignshift==off? "" :
1933 AMG_id2name(method+assignshift),
1934 method+assignshift==off? "" : "\")",
1935 flags & AMGf_unary? "" :
1936 lr==1 ? " for right argument": " for left argument",
1937 flags & AMGf_unary? " for argument" : "",
1938 stash ? HvNAME_get(stash) : "null",
1939 fl? ",\n\tassignment variant used": "") );
1942 /* Since we use shallow copy during assignment, we need
1943 * to dublicate the contents, probably calling user-supplied
1944 * version of copy operator
1946 /* We need to copy in following cases:
1947 * a) Assignment form was called.
1948 * assignshift==1, assign==T, method + 1 == off
1949 * b) Increment or decrement, called directly.
1950 * assignshift==0, assign==0, method + 0 == off
1951 * c) Increment or decrement, translated to assignment add/subtr.
1952 * assignshift==0, assign==T,
1954 * d) Increment or decrement, translated to nomethod.
1955 * assignshift==0, assign==0,
1957 * e) Assignment form translated to nomethod.
1958 * assignshift==1, assign==T, method + 1 != off
1961 /* off is method, method+assignshift, or a result of opcode substitution.
1962 * In the latter case assignshift==0, so only notfound case is important.
1964 if (( (method + assignshift == off)
1965 && (assign || (method == inc_amg) || (method == dec_amg)))
1972 const bool oldcatch = CATCH_GET;
1975 Zero(&myop, 1, BINOP);
1976 myop.op_last = (OP *) &myop;
1977 myop.op_next = NULL;
1978 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1980 PUSHSTACKi(PERLSI_OVERLOAD);
1983 PL_op = (OP *) &myop;
1984 if (PERLDB_SUB && PL_curstash != PL_debstash)
1985 PL_op->op_private |= OPpENTERSUB_DB;
1989 EXTEND(SP, notfound + 5);
1990 PUSHs(lr>0? right: left);
1991 PUSHs(lr>0? left: right);
1992 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1994 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1999 if ((PL_op = Perl_pp_entersub(aTHX)))
2007 CATCH_SET(oldcatch);
2014 ans=SvIV(res)<=0; break;
2017 ans=SvIV(res)<0; break;
2020 ans=SvIV(res)>=0; break;
2023 ans=SvIV(res)>0; break;
2026 ans=SvIV(res)==0; break;
2029 ans=SvIV(res)!=0; break;
2032 SvSetSV(left,res); return left;
2034 ans=!SvTRUE(res); break;
2039 } else if (method==copy_amg) {
2041 Perl_croak(aTHX_ "Copy method did not return a reference");
2043 return SvREFCNT_inc(SvRV(res));
2051 =for apidoc is_gv_magical_sv
2053 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
2059 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
2062 const char * const temp = SvPV_const(name, len);
2063 return is_gv_magical(temp, len, flags);
2067 =for apidoc is_gv_magical
2069 Returns C<TRUE> if given the name of a magical GV.
2071 Currently only useful internally when determining if a GV should be
2072 created even in rvalue contexts.
2074 C<flags> is not used at present but available for future extension to
2075 allow selecting particular classes of magical variable.
2077 Currently assumes that C<name> is NUL terminated (as well as len being valid).
2078 This assumption is met by all callers within the perl core, which all pass
2079 pointers returned by SvPV.
2084 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
2086 PERL_UNUSED_CONTEXT;
2087 PERL_UNUSED_ARG(flags);
2090 const char * const name1 = name + 1;
2093 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
2097 if (len == 8 && strEQ(name1, "VERLOAD"))
2101 if (len == 3 && name[1] == 'I' && name[2] == 'G')
2104 /* Using ${^...} variables is likely to be sufficiently rare that
2105 it seems sensible to avoid the space hit of also checking the
2107 case '\017': /* ${^OPEN} */
2108 if (strEQ(name1, "PEN"))
2111 case '\024': /* ${^TAINT} */
2112 if (strEQ(name1, "AINT"))
2115 case '\025': /* ${^UNICODE} */
2116 if (strEQ(name1, "NICODE"))
2118 if (strEQ(name1, "TF8LOCALE"))
2121 case '\027': /* ${^WARNING_BITS} */
2122 if (strEQ(name1, "ARNING_BITS"))
2135 const char *end = name + len;
2136 while (--end > name) {
2144 /* Because we're already assuming that name is NUL terminated
2145 below, we can treat an empty name as "\0" */
2172 case '\001': /* $^A */
2173 case '\003': /* $^C */
2174 case '\004': /* $^D */
2175 case '\005': /* $^E */
2176 case '\006': /* $^F */
2177 case '\010': /* $^H */
2178 case '\011': /* $^I, NOT \t in EBCDIC */
2179 case '\014': /* $^L */
2180 case '\016': /* $^N */
2181 case '\017': /* $^O */
2182 case '\020': /* $^P */
2183 case '\023': /* $^S */
2184 case '\024': /* $^T */
2185 case '\026': /* $^V */
2186 case '\027': /* $^W */
2206 Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
2212 PERL_UNUSED_ARG(flags);
2215 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
2217 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
2218 unshare_hek(GvNAME_HEK(gv));
2221 PERL_HASH(hash, name, len);
2222 GvNAME_HEK(gv) = share_hek(name, len, hash);
2227 * c-indentation-style: bsd
2229 * indent-tabs-mode: t
2232 * ex: set ts=8 sts=4 sw=4 noet: