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
704 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
707 stash = gv_stashsv(namesv, 0);
709 Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" is not available",
710 varname, SVfARG(namesv));
711 else if (!gv_fetchmethod(stash, methpv))
712 Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" does not support method %s",
713 varname, SVfARG(namesv), methpv);
715 SvREFCNT_dec(namesv);
720 =for apidoc gv_stashpv
722 Returns a pointer to the stash for a specified package. Uses C<strlen> to
723 determine the length of C<name>, then calls C<gv_stashpvn()>.
729 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
731 return gv_stashpvn(name, strlen(name), create);
735 =for apidoc gv_stashpvn
737 Returns a pointer to the stash for a specified package. The C<namelen>
738 parameter indicates the length of the C<name>, in bytes. C<flags> is passed
739 to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
740 created if it does not already exist. If the package does not exist and
741 C<flags> is 0 (or any other setting that does not create packages) then NULL
749 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
756 if (namelen + 2 <= sizeof smallbuf)
759 Newx(tmpbuf, namelen + 2, char);
760 Copy(name,tmpbuf,namelen,char);
761 tmpbuf[namelen++] = ':';
762 tmpbuf[namelen++] = ':';
763 tmpgv = gv_fetchpvn_flags(tmpbuf, namelen, flags, SVt_PVHV);
764 if (tmpbuf != smallbuf)
769 GvHV(tmpgv) = newHV();
771 if (!HvNAME_get(stash))
772 hv_name_set(stash, name, namelen, 0);
777 =for apidoc gv_stashsv
779 Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
785 Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
788 const char * const ptr = SvPV_const(sv,len);
789 return gv_stashpvn(ptr, len, flags);
794 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
795 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
799 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
801 const char * const nambeg = SvPV_const(name, len);
802 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
806 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
810 register const char *name = nambeg;
811 register GV *gv = NULL;
814 register const char *name_cursor;
816 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
817 const I32 no_expand = flags & GV_NOEXPAND;
818 const I32 add = flags & ~GV_NOADD_MASK;
819 const char *const name_end = nambeg + full_len;
820 const char *const name_em1 = name_end - 1;
822 if (flags & GV_NOTQUAL) {
823 /* Caller promised that there is no stash, so we can skip the check. */
828 if (full_len > 2 && *name == '*' && isALPHA(name[1])) {
829 /* accidental stringify on a GV? */
833 for (name_cursor = name; name_cursor < name_end; name_cursor++) {
834 if ((*name_cursor == ':' && name_cursor < name_em1
835 && name_cursor[1] == ':')
836 || (*name_cursor == '\'' && name_cursor[1]))
840 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
843 len = name_cursor - name;
848 if (len + 2 <= (I32)sizeof (smallbuf))
851 Newx(tmpbuf, len+2, char);
852 Copy(name, tmpbuf, len, char);
855 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
856 gv = gvp ? *gvp : NULL;
857 if (gv && gv != (GV*)&PL_sv_undef) {
858 if (SvTYPE(gv) != SVt_PVGV)
859 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
863 if (tmpbuf != smallbuf)
865 if (!gv || gv == (GV*)&PL_sv_undef)
868 if (!(stash = GvHV(gv)))
869 stash = GvHV(gv) = newHV();
871 if (!HvNAME_get(stash))
872 hv_name_set(stash, nambeg, name_cursor - nambeg, 0);
875 if (*name_cursor == ':')
879 if (name == name_end)
880 return gv ? gv : (GV*)*hv_fetchs(PL_defstash, "main::", TRUE);
883 len = name_cursor - name;
885 /* No stash in name, so see how we can default */
889 if (len && isIDFIRST_lazy(name)) {
898 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
899 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
900 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
904 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
909 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
910 && name[3] == 'I' && name[4] == 'N')
914 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
915 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
916 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
920 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
921 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
929 else if (IN_PERL_COMPILETIME) {
931 if (add && (PL_hints & HINT_STRICT_VARS) &&
932 sv_type != SVt_PVCV &&
933 sv_type != SVt_PVGV &&
934 sv_type != SVt_PVFM &&
935 sv_type != SVt_PVIO &&
936 !(len == 1 && sv_type == SVt_PV &&
937 (*name == 'a' || *name == 'b')) )
939 gvp = (GV**)hv_fetch(stash,name,len,0);
941 *gvp == (GV*)&PL_sv_undef ||
942 SvTYPE(*gvp) != SVt_PVGV)
946 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
947 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
948 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
950 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
951 sv_type == SVt_PVAV ? '@' :
952 sv_type == SVt_PVHV ? '%' : '$',
955 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
961 stash = CopSTASH(PL_curcop);
967 /* By this point we should have a stash and a name */
971 SV * const err = Perl_mess(aTHX_
972 "Global symbol \"%s%s\" requires explicit package name",
973 (sv_type == SVt_PV ? "$"
974 : sv_type == SVt_PVAV ? "@"
975 : sv_type == SVt_PVHV ? "%"
978 if (USE_UTF8_IN_NAMES)
981 gv = gv_fetchpvn_flags("<none>::", 8, GV_ADDMULTI, SVt_PVHV);
983 /* symbol table under destruction */
992 if (!SvREFCNT(stash)) /* symbol table under destruction */
995 gvp = (GV**)hv_fetch(stash,name,len,add);
996 if (!gvp || *gvp == (GV*)&PL_sv_undef)
999 if (SvTYPE(gv) == SVt_PVGV) {
1002 gv_init_sv(gv, sv_type);
1003 if (len == 1 && (sv_type == SVt_PVHV || sv_type == SVt_PVGV)) {
1005 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1006 else if (*name == '-' || *name == '+')
1007 require_tie_mod(gv, name, newSVpvs("re::Tie::Hash::NamedCapture"), "FETCH", 0);
1011 } else if (no_init) {
1013 } else if (no_expand && SvROK(gv)) {
1017 /* Adding a new symbol */
1019 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
1020 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
1021 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
1022 gv_init_sv(gv, sv_type);
1024 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
1025 : (PL_dowarn & G_WARN_ON ) ) )
1028 /* set up magic where warranted */
1033 /* Nothing else to do.
1034 The compiler will probably turn the switch statement into a
1035 branch table. Make sure we avoid even that small overhead for
1036 the common case of lower case variable names. */
1040 const char * const name2 = name + 1;
1043 if (strEQ(name2, "RGV")) {
1044 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1046 else if (strEQ(name2, "RGVOUT")) {
1051 if (strnEQ(name2, "XPORT", 5))
1055 if (strEQ(name2, "SA")) {
1056 AV* const av = GvAVn(gv);
1058 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, NULL, 0);
1059 /* NOTE: No support for tied ISA */
1060 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
1061 && AvFILLp(av) == -1)
1064 av_push(av, newSVpvn(pname = "NDBM_File",9));
1065 gv_stashpvn(pname, 9, GV_ADD);
1066 av_push(av, newSVpvn(pname = "DB_File",7));
1067 gv_stashpvn(pname, 7, GV_ADD);
1068 av_push(av, newSVpvn(pname = "GDBM_File",9));
1069 gv_stashpvn(pname, 9, GV_ADD);
1070 av_push(av, newSVpvn(pname = "SDBM_File",9));
1071 gv_stashpvn(pname, 9, GV_ADD);
1072 av_push(av, newSVpvn(pname = "ODBM_File",9));
1073 gv_stashpvn(pname, 9, GV_ADD);
1078 if (strEQ(name2, "VERLOAD")) {
1079 HV* const hv = GvHVn(gv);
1081 hv_magic(hv, NULL, PERL_MAGIC_overload);
1085 if (strEQ(name2, "IG")) {
1089 Newxz(PL_psig_ptr, SIG_SIZE, SV*);
1090 Newxz(PL_psig_name, SIG_SIZE, SV*);
1091 Newxz(PL_psig_pend, SIG_SIZE, int);
1095 hv_magic(hv, NULL, PERL_MAGIC_sig);
1096 for (i = 1; i < SIG_SIZE; i++) {
1097 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1099 sv_setsv(*init, &PL_sv_undef);
1101 PL_psig_name[i] = 0;
1102 PL_psig_pend[i] = 0;
1107 if (strEQ(name2, "ERSION"))
1110 case '\003': /* $^CHILD_ERROR_NATIVE */
1111 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1114 case '\005': /* $^ENCODING */
1115 if (strEQ(name2, "NCODING"))
1118 case '\015': /* $^MATCH */
1119 if (strEQ(name2, "ATCH"))
1121 case '\017': /* $^OPEN */
1122 if (strEQ(name2, "PEN"))
1125 case '\020': /* $^PREMATCH $^POSTMATCH */
1126 if (strEQ(name2, "REMATCH") || strEQ(name2, "OSTMATCH"))
1128 case '\024': /* ${^TAINT} */
1129 if (strEQ(name2, "AINT"))
1132 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1133 if (strEQ(name2, "NICODE"))
1135 if (strEQ(name2, "TF8LOCALE"))
1137 if (strEQ(name2, "TF8CACHE"))
1140 case '\027': /* $^WARNING_BITS */
1141 if (strEQ(name2, "ARNING_BITS"))
1154 /* ensures variable is only digits */
1155 /* ${"1foo"} fails this test (and is thus writeable) */
1156 /* added by japhy, but borrowed from is_gv_magical */
1157 const char *end = name + len;
1158 while (--end > name) {
1159 if (!isDIGIT(*end)) return gv;
1166 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1167 be case '\0' in this switch statement (ie a default case) */
1173 sv_type == SVt_PVAV ||
1174 sv_type == SVt_PVHV ||
1175 sv_type == SVt_PVCV ||
1176 sv_type == SVt_PVFM ||
1179 PL_sawampersand = TRUE;
1183 sv_setpv(GvSVn(gv),PL_chopset);
1187 #ifdef COMPLEX_STATUS
1188 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1194 /* If %! has been used, automatically load Errno.pm. */
1196 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1198 /* magicalization must be done before require_tie_mod is called */
1199 if (sv_type == SVt_PVHV)
1200 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1205 GvMULTI_on(gv); /* no used once warnings here */
1207 bool plus = (*name == '+');
1208 SV *stashname = newSVpvs("re::Tie::Hash::NamedCapture");
1209 AV* const av = GvAVn(gv);
1210 HV *const hv = GvHVn(gv);
1211 HV *const hv_tie = newHV();
1212 SV *tie = newRV_noinc((SV*)hv_tie);
1214 sv_bless(tie, gv_stashsv(stashname, GV_ADD));
1215 hv_magic(hv, (GV*)tie, PERL_MAGIC_tied);
1216 sv_magic((SV*)av, (plus ? (SV*)av : NULL), PERL_MAGIC_regdata, NULL, 0);
1217 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1220 SvREADONLY_on(GvSVn(gv));
1222 Perl_hv_store(aTHX_ hv_tie, STR_WITH_LEN("all"), newSViv(1), 0);
1228 require_tie_mod(gv, name, stashname, "FETCH", 0);
1234 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1235 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1236 "$%c is no longer supported", *name);
1239 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1242 case '\010': /* $^H */
1244 HV *const hv = GvHVn(gv);
1245 hv_magic(hv, NULL, PERL_MAGIC_hints);
1248 case '\023': /* $^S */
1259 SvREADONLY_on(GvSVn(gv));
1274 case '\001': /* $^A */
1275 case '\003': /* $^C */
1276 case '\004': /* $^D */
1277 case '\005': /* $^E */
1278 case '\006': /* $^F */
1279 case '\011': /* $^I, NOT \t in EBCDIC */
1280 case '\016': /* $^N */
1281 case '\017': /* $^O */
1282 case '\020': /* $^P */
1283 case '\024': /* $^T */
1284 case '\027': /* $^W */
1286 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1289 case '\014': /* $^L */
1290 sv_setpvn(GvSVn(gv),"\f",1);
1291 PL_formfeed = GvSVn(gv);
1294 sv_setpvn(GvSVn(gv),"\034",1);
1298 SV * const sv = GvSVn(gv);
1299 if (!sv_derived_from(PL_patchlevel, "version"))
1300 upg_version(PL_patchlevel);
1301 GvSV(gv) = vnumify(PL_patchlevel);
1302 SvREADONLY_on(GvSV(gv));
1306 case '\026': /* $^V */
1308 SV * const sv = GvSVn(gv);
1309 GvSV(gv) = new_version(PL_patchlevel);
1310 SvREADONLY_on(GvSV(gv));
1320 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1324 const HV * const hv = GvSTASH(gv);
1329 sv_setpv(sv, prefix ? prefix : "");
1331 name = HvNAME_get(hv);
1333 namelen = HvNAMELEN_get(hv);
1339 if (keepmain || strNE(name, "main")) {
1340 sv_catpvn(sv,name,namelen);
1343 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1347 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1349 const GV * const egv = GvEGV(gv);
1350 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1358 IO * const io = (IO*)newSV_type(SVt_PVIO);
1359 /* This used to read SvREFCNT(io) = 1;
1360 It's not clear why the reference count needed an explicit reset. NWC
1362 assert (SvREFCNT(io) == 1);
1364 /* Clear the stashcache because a new IO could overrule a package name */
1365 hv_clear(PL_stashcache);
1366 iogv = gv_fetchpvs("FileHandle::", 0, SVt_PVHV);
1367 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1368 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1369 iogv = gv_fetchpvs("IO::Handle::", GV_ADD, SVt_PVHV);
1370 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1375 Perl_gv_check(pTHX_ const HV *stash)
1380 if (!HvARRAY(stash))
1382 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1384 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1387 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1388 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1390 if (hv != PL_defstash && hv != stash)
1391 gv_check(hv); /* nested package */
1393 else if (isALPHA(*HeKEY(entry))) {
1395 gv = (GV*)HeVAL(entry);
1396 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1399 /* performance hack: if filename is absolute and it's a standard
1400 * module, don't bother warning */
1401 #ifdef MACOS_TRADITIONAL
1402 # define LIB_COMPONENT ":lib:"
1404 # define LIB_COMPONENT "/lib/"
1407 && PERL_FILE_IS_ABSOLUTE(file)
1408 && (instr(file, LIB_COMPONENT) || instr(file, ".pm")))
1412 CopLINE_set(PL_curcop, GvLINE(gv));
1414 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1416 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1418 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1419 "Name \"%s::%s\" used only once: possible typo",
1420 HvNAME_get(stash), GvNAME(gv));
1427 Perl_newGVgen(pTHX_ const char *pack)
1430 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1434 /* hopefully this is only called on local symbol table entries */
1437 Perl_gp_ref(pTHX_ GP *gp)
1445 /* multi-named GPs cannot be used for method cache */
1446 SvREFCNT_dec(gp->gp_cv);
1451 /* Adding a new name to a subroutine invalidates method cache */
1452 PL_sub_generation++;
1459 Perl_gp_free(pTHX_ GV *gv)
1464 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
1466 if (gp->gp_refcnt == 0) {
1467 if (ckWARN_d(WARN_INTERNAL))
1468 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1469 "Attempt to free unreferenced glob pointers"
1470 pTHX__FORMAT pTHX__VALUE);
1474 /* Deleting the name of a subroutine invalidates method cache */
1475 PL_sub_generation++;
1477 if (--gp->gp_refcnt > 0) {
1478 if (gp->gp_egv == gv)
1484 if (gp->gp_file_hek)
1485 unshare_hek(gp->gp_file_hek);
1486 SvREFCNT_dec(gp->gp_sv);
1487 SvREFCNT_dec(gp->gp_av);
1488 /* FIXME - another reference loop GV -> symtab -> GV ?
1489 Somehow gp->gp_hv can end up pointing at freed garbage. */
1490 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1491 const char *hvname = HvNAME_get(gp->gp_hv);
1492 if (PL_stashcache && hvname)
1493 hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv),
1495 SvREFCNT_dec(gp->gp_hv);
1497 SvREFCNT_dec(gp->gp_io);
1498 SvREFCNT_dec(gp->gp_cv);
1499 SvREFCNT_dec(gp->gp_form);
1506 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1508 AMT * const amtp = (AMT*)mg->mg_ptr;
1509 PERL_UNUSED_ARG(sv);
1511 if (amtp && AMT_AMAGIC(amtp)) {
1513 for (i = 1; i < NofAMmeth; i++) {
1514 CV * const cv = amtp->table[i];
1516 SvREFCNT_dec((SV *) cv);
1517 amtp->table[i] = NULL;
1524 /* Updates and caches the CV's */
1527 Perl_Gv_AMupdate(pTHX_ HV *stash)
1530 MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1534 const AMT * const amtp = (AMT*)mg->mg_ptr;
1535 if (amtp->was_ok_am == PL_amagic_generation
1536 && amtp->was_ok_sub == PL_sub_generation) {
1537 return (bool)AMT_OVERLOADED(amtp);
1539 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1542 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1545 amt.was_ok_am = PL_amagic_generation;
1546 amt.was_ok_sub = PL_sub_generation;
1547 amt.fallback = AMGfallNO;
1551 int filled = 0, have_ovl = 0;
1554 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1556 /* Try to find via inheritance. */
1557 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1558 SV * const sv = gv ? GvSV(gv) : NULL;
1562 lim = DESTROY_amg; /* Skip overloading entries. */
1563 #ifdef PERL_DONT_CREATE_GVSV
1565 NOOP; /* Equivalent to !SvTRUE and !SvOK */
1568 else if (SvTRUE(sv))
1569 amt.fallback=AMGfallYES;
1571 amt.fallback=AMGfallNEVER;
1573 for (i = 1; i < lim; i++)
1574 amt.table[i] = NULL;
1575 for (; i < NofAMmeth; i++) {
1576 const char * const cooky = PL_AMG_names[i];
1577 /* Human-readable form, for debugging: */
1578 const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1579 const STRLEN l = strlen(cooky);
1581 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1582 cp, HvNAME_get(stash)) );
1583 /* don't fill the cache while looking up!
1584 Creation of inheritance stubs in intermediate packages may
1585 conflict with the logic of runtime method substitution.
1586 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1587 then we could have created stubs for "(+0" in A and C too.
1588 But if B overloads "bool", we may want to use it for
1589 numifying instead of C's "+0". */
1590 if (i >= DESTROY_amg)
1591 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1592 else /* Autoload taken care of below */
1593 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1595 if (gv && (cv = GvCV(gv))) {
1597 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1598 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1599 /* This is a hack to support autoloading..., while
1600 knowing *which* methods were declared as overloaded. */
1601 /* GvSV contains the name of the method. */
1603 SV *gvsv = GvSV(gv);
1605 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1606 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1607 (void*)GvSV(gv), cp, hvname) );
1608 if (!gvsv || !SvPOK(gvsv)
1609 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1612 /* Can be an import stub (created by "can"). */
1613 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1614 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1615 "in package \"%.256s\"",
1616 (GvCVGEN(gv) ? "Stub found while resolving"
1620 cv = GvCV(gv = ngv);
1622 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1623 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1624 GvNAME(CvGV(cv))) );
1626 if (i < DESTROY_amg)
1628 } else if (gv) { /* Autoloaded... */
1632 amt.table[i]=(CV*)SvREFCNT_inc_simple(cv);
1635 AMT_AMAGIC_on(&amt);
1637 AMT_OVERLOADED_on(&amt);
1638 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1639 (char*)&amt, sizeof(AMT));
1643 /* Here we have no table: */
1645 AMT_AMAGIC_off(&amt);
1646 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1647 (char*)&amt, sizeof(AMTS));
1653 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1659 if (!stash || !HvNAME_get(stash))
1661 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1665 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1668 amtp = (AMT*)mg->mg_ptr;
1669 if ( amtp->was_ok_am != PL_amagic_generation
1670 || amtp->was_ok_sub != PL_sub_generation )
1672 if (AMT_AMAGIC(amtp)) {
1673 CV * const ret = amtp->table[id];
1674 if (ret && isGV(ret)) { /* Autoloading stab */
1675 /* Passing it through may have resulted in a warning
1676 "Inherited AUTOLOAD for a non-method deprecated", since
1677 our caller is going through a function call, not a method call.
1678 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1679 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1692 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1697 CV **cvp=NULL, **ocvp=NULL;
1698 AMT *amtp=NULL, *oamtp=NULL;
1699 int off = 0, off1, lr = 0, notfound = 0;
1700 int postpr = 0, force_cpy = 0;
1701 int assign = AMGf_assign & flags;
1702 const int assignshift = assign ? 1 : 0;
1707 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1708 && (stash = SvSTASH(SvRV(left)))
1709 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1710 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1711 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1713 && ((cv = cvp[off=method+assignshift])
1714 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1720 cv = cvp[off=method])))) {
1721 lr = -1; /* Call method for left argument */
1723 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1726 /* look for substituted methods */
1727 /* In all the covered cases we should be called with assign==0. */
1731 if ((cv = cvp[off=add_ass_amg])
1732 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1733 right = &PL_sv_yes; lr = -1; assign = 1;
1738 if ((cv = cvp[off = subtr_ass_amg])
1739 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1740 right = &PL_sv_yes; lr = -1; assign = 1;
1744 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1747 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1750 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1753 (void)((cv = cvp[off=bool__amg])
1754 || (cv = cvp[off=numer_amg])
1755 || (cv = cvp[off=string_amg]));
1761 * SV* ref causes confusion with the interpreter variable of
1764 SV* const tmpRef=SvRV(left);
1765 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1767 * Just to be extra cautious. Maybe in some
1768 * additional cases sv_setsv is safe, too.
1770 SV* const newref = newSVsv(tmpRef);
1771 SvOBJECT_on(newref);
1772 /* As a bit of a source compatibility hack, SvAMAGIC() and
1773 friends dereference an RV, to behave the same was as when
1774 overloading was stored on the reference, not the referant.
1775 Hence we can't use SvAMAGIC_on()
1777 SvFLAGS(newref) |= SVf_AMAGIC;
1778 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1784 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1785 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1786 SV* const nullsv=sv_2mortal(newSViv(0));
1788 SV* const lessp = amagic_call(left,nullsv,
1789 lt_amg,AMGf_noright);
1790 logic = SvTRUE(lessp);
1792 SV* const lessp = amagic_call(left,nullsv,
1793 ncmp_amg,AMGf_noright);
1794 logic = (SvNV(lessp) < 0);
1797 if (off==subtr_amg) {
1808 if ((cv = cvp[off=subtr_amg])) {
1810 left = sv_2mortal(newSViv(0));
1815 case iter_amg: /* XXXX Eventually should do to_gv. */
1817 return NULL; /* Delegate operation to standard mechanisms. */
1825 return left; /* Delegate operation to standard mechanisms. */
1830 if (!cv) goto not_found;
1831 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1832 && (stash = SvSTASH(SvRV(right)))
1833 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1834 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1835 ? (amtp = (AMT*)mg->mg_ptr)->table
1837 && (cv = cvp[off=method])) { /* Method for right
1840 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1841 && (cvp=ocvp) && (lr = -1))
1842 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1843 && !(flags & AMGf_unary)) {
1844 /* We look for substitution for
1845 * comparison operations and
1847 if (method==concat_amg || method==concat_ass_amg
1848 || method==repeat_amg || method==repeat_ass_amg) {
1849 return NULL; /* Delegate operation to string conversion */
1859 postpr = 1; off=ncmp_amg; break;
1866 postpr = 1; off=scmp_amg; break;
1868 if (off != -1) cv = cvp[off];
1873 not_found: /* No method found, either report or croak */
1894 return left; /* Delegate operation to standard mechanisms. */
1897 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1898 notfound = 1; lr = -1;
1899 } else if (cvp && (cv=cvp[nomethod_amg])) {
1900 notfound = 1; lr = 1;
1901 } else if ((amtp && amtp->fallback >= AMGfallYES) && !DEBUG_o_TEST) {
1902 /* Skip generating the "no method found" message. */
1906 if (off==-1) off=method;
1907 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1908 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1909 AMG_id2name(method + assignshift),
1910 (flags & AMGf_unary ? " " : "\n\tleft "),
1912 "in overloaded package ":
1913 "has no overloaded magic",
1915 HvNAME_get(SvSTASH(SvRV(left))):
1918 ",\n\tright argument in overloaded package ":
1921 : ",\n\tright argument has no overloaded magic"),
1923 HvNAME_get(SvSTASH(SvRV(right))):
1925 if (amtp && amtp->fallback >= AMGfallYES) {
1926 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1928 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
1932 force_cpy = force_cpy || assign;
1937 DEBUG_o(Perl_deb(aTHX_
1938 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1940 method+assignshift==off? "" :
1942 method+assignshift==off? "" :
1943 AMG_id2name(method+assignshift),
1944 method+assignshift==off? "" : "\")",
1945 flags & AMGf_unary? "" :
1946 lr==1 ? " for right argument": " for left argument",
1947 flags & AMGf_unary? " for argument" : "",
1948 stash ? HvNAME_get(stash) : "null",
1949 fl? ",\n\tassignment variant used": "") );
1952 /* Since we use shallow copy during assignment, we need
1953 * to dublicate the contents, probably calling user-supplied
1954 * version of copy operator
1956 /* We need to copy in following cases:
1957 * a) Assignment form was called.
1958 * assignshift==1, assign==T, method + 1 == off
1959 * b) Increment or decrement, called directly.
1960 * assignshift==0, assign==0, method + 0 == off
1961 * c) Increment or decrement, translated to assignment add/subtr.
1962 * assignshift==0, assign==T,
1964 * d) Increment or decrement, translated to nomethod.
1965 * assignshift==0, assign==0,
1967 * e) Assignment form translated to nomethod.
1968 * assignshift==1, assign==T, method + 1 != off
1971 /* off is method, method+assignshift, or a result of opcode substitution.
1972 * In the latter case assignshift==0, so only notfound case is important.
1974 if (( (method + assignshift == off)
1975 && (assign || (method == inc_amg) || (method == dec_amg)))
1982 const bool oldcatch = CATCH_GET;
1985 Zero(&myop, 1, BINOP);
1986 myop.op_last = (OP *) &myop;
1987 myop.op_next = NULL;
1988 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1990 PUSHSTACKi(PERLSI_OVERLOAD);
1993 PL_op = (OP *) &myop;
1994 if (PERLDB_SUB && PL_curstash != PL_debstash)
1995 PL_op->op_private |= OPpENTERSUB_DB;
1999 EXTEND(SP, notfound + 5);
2000 PUSHs(lr>0? right: left);
2001 PUSHs(lr>0? left: right);
2002 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
2004 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
2009 if ((PL_op = Perl_pp_entersub(aTHX)))
2017 CATCH_SET(oldcatch);
2024 ans=SvIV(res)<=0; break;
2027 ans=SvIV(res)<0; break;
2030 ans=SvIV(res)>=0; break;
2033 ans=SvIV(res)>0; break;
2036 ans=SvIV(res)==0; break;
2039 ans=SvIV(res)!=0; break;
2042 SvSetSV(left,res); return left;
2044 ans=!SvTRUE(res); break;
2049 } else if (method==copy_amg) {
2051 Perl_croak(aTHX_ "Copy method did not return a reference");
2053 return SvREFCNT_inc(SvRV(res));
2061 =for apidoc is_gv_magical_sv
2063 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
2069 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
2072 const char * const temp = SvPV_const(name, len);
2073 return is_gv_magical(temp, len, flags);
2077 =for apidoc is_gv_magical
2079 Returns C<TRUE> if given the name of a magical GV.
2081 Currently only useful internally when determining if a GV should be
2082 created even in rvalue contexts.
2084 C<flags> is not used at present but available for future extension to
2085 allow selecting particular classes of magical variable.
2087 Currently assumes that C<name> is NUL terminated (as well as len being valid).
2088 This assumption is met by all callers within the perl core, which all pass
2089 pointers returned by SvPV.
2094 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
2096 PERL_UNUSED_CONTEXT;
2097 PERL_UNUSED_ARG(flags);
2100 const char * const name1 = name + 1;
2103 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
2107 if (len == 8 && strEQ(name1, "VERLOAD"))
2111 if (len == 3 && name[1] == 'I' && name[2] == 'G')
2114 /* Using ${^...} variables is likely to be sufficiently rare that
2115 it seems sensible to avoid the space hit of also checking the
2117 case '\017': /* ${^OPEN} */
2118 if (strEQ(name1, "PEN"))
2121 case '\024': /* ${^TAINT} */
2122 if (strEQ(name1, "AINT"))
2125 case '\025': /* ${^UNICODE} */
2126 if (strEQ(name1, "NICODE"))
2128 if (strEQ(name1, "TF8LOCALE"))
2131 case '\027': /* ${^WARNING_BITS} */
2132 if (strEQ(name1, "ARNING_BITS"))
2145 const char *end = name + len;
2146 while (--end > name) {
2154 /* Because we're already assuming that name is NUL terminated
2155 below, we can treat an empty name as "\0" */
2182 case '\001': /* $^A */
2183 case '\003': /* $^C */
2184 case '\004': /* $^D */
2185 case '\005': /* $^E */
2186 case '\006': /* $^F */
2187 case '\010': /* $^H */
2188 case '\011': /* $^I, NOT \t in EBCDIC */
2189 case '\014': /* $^L */
2190 case '\016': /* $^N */
2191 case '\017': /* $^O */
2192 case '\020': /* $^P */
2193 case '\023': /* $^S */
2194 case '\024': /* $^T */
2195 case '\026': /* $^V */
2196 case '\027': /* $^W */
2216 Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
2222 PERL_UNUSED_ARG(flags);
2225 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
2227 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
2228 unshare_hek(GvNAME_HEK(gv));
2231 PERL_HASH(hash, name, len);
2232 GvNAME_HEK(gv) = share_hek(name, len, hash);
2237 * c-indentation-style: bsd
2239 * indent-tabs-mode: t
2242 * ex: set ts=8 sts=4 sw=4 noet: