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 $foo, @foo, %foo.
27 GVs are usually found as values in stashes (symbol table hashes) where
28 Perl stores its global variables.
37 static const char S_autoload[] = "AUTOLOAD";
38 static const STRLEN S_autolen = sizeof(S_autoload)-1;
41 #ifdef PERL_DONT_CREATE_GVSV
43 Perl_gv_SVadd(pTHX_ GV *gv)
45 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
46 Perl_croak(aTHX_ "Bad symbol for scalar");
54 Perl_gv_AVadd(pTHX_ register GV *gv)
56 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
57 Perl_croak(aTHX_ "Bad symbol for array");
64 Perl_gv_HVadd(pTHX_ register GV *gv)
66 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
67 Perl_croak(aTHX_ "Bad symbol for hash");
74 Perl_gv_IOadd(pTHX_ register GV *gv)
77 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) {
80 * if it walks like a dirhandle, then let's assume that
81 * this is a dirhandle.
83 const char * const fh =
84 PL_op->op_type == OP_READDIR ||
85 PL_op->op_type == OP_TELLDIR ||
86 PL_op->op_type == OP_SEEKDIR ||
87 PL_op->op_type == OP_REWINDDIR ||
88 PL_op->op_type == OP_CLOSEDIR ?
89 "dirhandle" : "filehandle";
90 Perl_croak(aTHX_ "Bad symbol for %s", fh);
94 #ifdef GV_UNIQUE_CHECK
96 Perl_croak(aTHX_ "Bad symbol for filehandle (GV is unique)");
105 Perl_gv_fetchfile(pTHX_ const char *name)
116 tmplen = strlen(name) + 2;
117 if (tmplen < sizeof smallbuf)
120 Newx(tmpbuf, tmplen + 1, char);
121 /* This is where the debugger's %{"::_<$filename"} hash is created */
124 memcpy(tmpbuf + 2, name, tmplen - 1);
125 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
127 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
128 #ifdef PERL_DONT_CREATE_GVSV
129 GvSV(gv) = newSVpvn(name, tmplen - 2);
131 sv_setpvn(GvSV(gv), name, tmplen - 2);
134 hv_magic(GvHVn(gv_AVadd(gv)), NULL, PERL_MAGIC_dbfile);
136 if (tmpbuf != smallbuf)
142 =for apidoc gv_const_sv
144 If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
145 inlining, or C<gv> is a placeholder reference that would be promoted to such
146 a typeglob, then returns the value returned by the sub. Otherwise, returns
153 Perl_gv_const_sv(pTHX_ GV *gv)
155 if (SvTYPE(gv) == SVt_PVGV)
156 return cv_const_sv(GvCVu(gv));
157 return SvROK(gv) ? SvRV(gv) : NULL;
161 Perl_newGP(pTHX_ GV *const gv)
164 const char *const file
165 = (PL_curcop && CopFILE(PL_curcop)) ? CopFILE(PL_curcop) : "";
166 STRLEN len = strlen(file);
169 PERL_HASH(hash, file, len);
173 #ifndef PERL_DONT_CREATE_GVSV
174 gp->gp_sv = newSV(0);
177 gp->gp_line = PL_curcop ? CopLINE(PL_curcop) : 0;
178 /* XXX Ideally this cast would be replaced with a change to const char*
180 gp->gp_file_hek = share_hek(file, len, hash);
188 Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
191 const U32 old_type = SvTYPE(gv);
192 const bool doproto = old_type > SVt_NULL;
193 const char * const proto = (doproto && SvPOK(gv)) ? SvPVX_const(gv) : NULL;
194 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
195 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
197 assert (!(proto && has_constant));
200 /* The constant has to be a simple scalar type. */
201 switch (SvTYPE(has_constant)) {
207 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
208 sv_reftype(has_constant, 0));
216 if (old_type < SVt_PVGV) {
217 if (old_type >= SVt_PV)
219 sv_upgrade((SV*)gv, SVt_PVGV);
227 Safefree(SvPVX_mutable(gv));
232 GvGP(gv) = Perl_newGP(aTHX_ gv);
235 Perl_sv_add_backref(aTHX_ (SV*)stash, (SV*)gv);
236 gv_name_set(gv, name, len, GV_ADD);
237 if (multi || doproto) /* doproto means it _was_ mentioned */
239 if (doproto) { /* Replicate part of newSUB here. */
242 /* newCONSTSUB takes ownership of the reference from us. */
243 GvCV(gv) = newCONSTSUB(stash, name, has_constant);
244 /* If this reference was a copy of another, then the subroutine
245 must have been "imported", by a Perl space assignment to a GV
246 from a reference to CV. */
247 if (exported_constant)
248 GvIMPORTED_CV_on(gv);
250 /* XXX unsafe for threads if eval_owner isn't held */
251 (void) start_subparse(0,0); /* Create empty CV in compcv. */
252 GvCV(gv) = PL_compcv;
258 CvFILE_set_from_cop(GvCV(gv), PL_curcop);
259 CvSTASH(GvCV(gv)) = PL_curstash;
261 sv_setpv((SV*)GvCV(gv), proto);
268 S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
280 #ifdef PERL_DONT_CREATE_GVSV
293 =for apidoc gv_fetchmeth
295 Returns the glob with the given C<name> and a defined subroutine or
296 C<NULL>. The glob lives in the given C<stash>, or in the stashes
297 accessible via @ISA and UNIVERSAL::.
299 The argument C<level> should be either 0 or -1. If C<level==0>, as a
300 side-effect creates a glob with the given C<name> in the given C<stash>
301 which in the case of success contains an alias for the subroutine, and sets
302 up caching info for this glob. Similarly for all the searched stashes.
304 This function grants C<"SUPER"> token as a postfix of the stash name. The
305 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
306 visible to Perl code. So when calling C<call_sv>, you should not use
307 the GV directly; instead, you should use the method's CV, which can be
308 obtained from the GV with the C<GvCV> macro.
314 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
323 HV* lastchance = NULL;
325 /* UNIVERSAL methods should be callable without a stash */
327 level = -1; /* probably appropriate */
328 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
332 hvname = HvNAME_get(stash);
335 "Can't use anonymous symbol table for method lookup");
337 if ((level > 100) || (level < -100))
338 Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
341 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
343 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
348 if (SvTYPE(topgv) != SVt_PVGV)
349 gv_init(topgv, stash, name, len, TRUE);
350 if ((cv = GvCV(topgv))) {
351 /* If genuine method or valid cache entry, use it */
352 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
354 /* Stale cached entry: junk it */
356 GvCV(topgv) = cv = NULL;
359 else if (GvCVGEN(topgv) == PL_sub_generation)
360 return 0; /* cache indicates sub doesn't exist */
363 gvp = (GV**)hv_fetchs(stash, "ISA", FALSE);
364 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : NULL;
366 /* create and re-create @.*::SUPER::ISA on demand */
367 if (!av || !SvMAGIC(av)) {
368 STRLEN packlen = HvNAMELEN_get(stash);
370 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
374 basestash = gv_stashpvn(hvname, packlen, GV_ADD);
375 gvp = (GV**)hv_fetchs(basestash, "ISA", FALSE);
376 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
377 gvp = (GV**)hv_fetchs(stash, "ISA", TRUE);
378 if (!gvp || !(gv = *gvp))
379 Perl_croak(aTHX_ "Cannot create %s::ISA", hvname);
380 if (SvTYPE(gv) != SVt_PVGV)
381 gv_init(gv, stash, "ISA", 3, TRUE);
382 SvREFCNT_dec(GvAV(gv));
383 GvAV(gv) = (AV*)SvREFCNT_inc_simple(av);
389 SV** svp = AvARRAY(av);
390 /* NOTE: No support for tied ISA */
391 I32 items = AvFILLp(av) + 1;
393 SV* const sv = *svp++;
394 HV* const basestash = gv_stashsv(sv, 0);
396 if (ckWARN(WARN_MISC))
397 Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
401 gv = gv_fetchmeth(basestash, name, len,
402 (level >= 0) ? level + 1 : level - 1);
408 /* if at top level, try UNIVERSAL */
410 if (level == 0 || level == -1) {
411 lastchance = gv_stashpvs("UNIVERSAL", 0);
414 if ((gv = gv_fetchmeth(lastchance, name, len,
415 (level >= 0) ? level + 1 : level - 1)))
419 * Cache method in topgv if:
420 * 1. topgv has no synonyms (else inheritance crosses wires)
421 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
424 GvREFCNT(topgv) == 1 &&
426 (CvROOT(cv) || CvXSUB(cv)))
428 if ((cv = GvCV(topgv)))
430 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
431 GvCVGEN(topgv) = PL_sub_generation;
435 else if (topgv && GvREFCNT(topgv) == 1) {
436 /* cache the fact that the method is not defined */
437 GvCVGEN(topgv) = PL_sub_generation;
446 =for apidoc gv_fetchmeth_autoload
448 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
449 Returns a glob for the subroutine.
451 For an autoloaded subroutine without a GV, will create a GV even
452 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
453 of the result may be zero.
459 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
461 GV *gv = gv_fetchmeth(stash, name, len, level);
468 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
469 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
471 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
474 if (!(CvROOT(cv) || CvXSUB(cv)))
476 /* Have an autoload */
477 if (level < 0) /* Cannot do without a stub */
478 gv_fetchmeth(stash, name, len, 0);
479 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
488 =for apidoc gv_fetchmethod_autoload
490 Returns the glob which contains the subroutine to call to invoke the method
491 on the C<stash>. In fact in the presence of autoloading this may be the
492 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
495 The third parameter of C<gv_fetchmethod_autoload> determines whether
496 AUTOLOAD lookup is performed if the given method is not present: non-zero
497 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
498 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
499 with a non-zero C<autoload> parameter.
501 These functions grant C<"SUPER"> token as a prefix of the method name. Note
502 that if you want to keep the returned glob for a long time, you need to
503 check for it being "AUTOLOAD", since at the later time the call may load a
504 different subroutine due to $AUTOLOAD changing its value. Use the glob
505 created via a side effect to do this.
507 These functions have the same side-effects and as C<gv_fetchmeth> with
508 C<level==0>. C<name> should be writable if contains C<':'> or C<'
509 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
510 C<call_sv> apply equally to these functions.
516 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
519 register const char *nend;
520 const char *nsplit = NULL;
524 if (stash && SvTYPE(stash) < SVt_PVHV)
527 for (nend = name; *nend; nend++) {
530 else if (*nend == ':' && *(nend + 1) == ':')
534 const char * const origname = name;
538 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
539 /* ->SUPER::method should really be looked up in original stash */
540 SV * const tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
541 CopSTASHPV(PL_curcop)));
542 /* __PACKAGE__::SUPER stash should be autovivified */
543 stash = gv_stashpvn(SvPVX_const(tmpstr), SvCUR(tmpstr), GV_ADD);
544 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
545 origname, HvNAME_get(stash), name) );
548 /* don't autovifify if ->NoSuchStash::method */
549 stash = gv_stashpvn(origname, nsplit - origname, 0);
551 /* however, explicit calls to Pkg::SUPER::method may
552 happen, and may require autovivification to work */
553 if (!stash && (nsplit - origname) >= 7 &&
554 strnEQ(nsplit - 7, "::SUPER", 7) &&
555 gv_stashpvn(origname, nsplit - origname - 7, 0))
556 stash = gv_stashpvn(origname, nsplit - origname, GV_ADD);
561 gv = gv_fetchmeth(stash, name, nend - name, 0);
563 if (strEQ(name,"import") || strEQ(name,"unimport"))
564 gv = (GV*)&PL_sv_yes;
566 gv = gv_autoload4(ostash, name, nend - name, TRUE);
569 CV* const cv = GvCV(gv);
570 if (!CvROOT(cv) && !CvXSUB(cv)) {
578 if (GvCV(stubgv) != cv) /* orphaned import */
581 autogv = gv_autoload4(GvSTASH(stubgv),
582 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
592 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
600 const char *packname = "";
601 STRLEN packname_len = 0;
603 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
606 if (SvTYPE(stash) < SVt_PVHV) {
607 packname = SvPV_const((SV*)stash, packname_len);
611 packname = HvNAME_get(stash);
612 packname_len = HvNAMELEN_get(stash);
615 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
619 if (!(CvROOT(cv) || CvXSUB(cv)))
623 * Inheriting AUTOLOAD for non-methods works ... for now.
625 if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
626 && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)
628 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
629 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
630 packname, (int)len, name);
633 /* rather than lookup/init $AUTOLOAD here
634 * only to have the XSUB do another lookup for $AUTOLOAD
635 * and split that value on the last '::',
636 * pass along the same data via some unused fields in the CV
639 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
645 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
646 * The subroutine's original name may not be "AUTOLOAD", so we don't
647 * use that, but for lack of anything better we will use the sub's
648 * original package to look up $AUTOLOAD.
650 varstash = GvSTASH(CvGV(cv));
651 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
655 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
656 #ifdef PERL_DONT_CREATE_GVSV
657 GvSV(vargv) = newSV(0);
661 varsv = GvSVn(vargv);
662 sv_setpvn(varsv, packname, packname_len);
663 sv_catpvs(varsv, "::");
664 sv_catpvn(varsv, name, len);
669 /* require_tie_mod() internal routine for requiring a module
670 * that implements the logic of automatical ties like %! and %-
672 * The "gv" parameter should be the glob.
673 * "varpv" holds the name of the var, used for error messages
674 * "namesv" holds the module name
675 * "methpv" holds the method name to test for to check that things
676 * are working reasonably close to as expected
677 * "flags" if flag & 1 then save the scalar before loading.
678 * For the protection of $! to work (it is set by this routine)
679 * the sv slot must already be magicalized.
682 S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
685 HV* stash = gv_stashsv(namesv, 0);
687 if (!stash || !(gv_fetchmethod(stash, methpv))) {
688 SV *module = newSVsv(namesv);
694 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
697 stash = gv_stashsv(namesv, 0);
699 Perl_croak( aTHX_ "panic: Can't use %%%s because %"SVf" is not available",
700 varpv, SVfARG(module));
701 else if (!gv_fetchmethod(stash, methpv))
702 Perl_croak( aTHX_ "panic: Can't use %%%s because %"SVf" does not support method %s",
703 varpv, SVfARG(module), methpv);
709 =for apidoc gv_stashpv
711 Returns a pointer to the stash for a specified package. Uses C<strlen> to
712 determine the length of C<name, then calls C<gv_stashpvn()>.
718 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
720 return gv_stashpvn(name, strlen(name), create);
724 =for apidoc gv_stashpvn
726 Returns a pointer to the stash for a specified package. The C<namelen>
727 parameter indicates the length of the C<name>, in bytes. C<flags> is passed
728 to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
729 created if it does not already exist. If the package does not exist and
730 C<flags> is 0 (or any other setting that does not create packages) then NULL
738 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
745 if (namelen + 3 < sizeof smallbuf)
748 Newx(tmpbuf, namelen + 3, char);
749 Copy(name,tmpbuf,namelen,char);
750 tmpbuf[namelen++] = ':';
751 tmpbuf[namelen++] = ':';
752 tmpbuf[namelen] = '\0';
753 tmpgv = gv_fetchpvn_flags(tmpbuf, namelen, flags, SVt_PVHV);
754 if (tmpbuf != smallbuf)
759 GvHV(tmpgv) = newHV();
761 if (!HvNAME_get(stash))
762 hv_name_set(stash, name, namelen, 0);
767 =for apidoc gv_stashsv
769 Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
775 Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
778 const char * const ptr = SvPV_const(sv,len);
779 return gv_stashpvn(ptr, len, flags);
784 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
785 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
789 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
791 const char * const nambeg = SvPV_const(name, len);
792 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
796 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
800 register const char *name = nambeg;
801 register GV *gv = NULL;
804 register const char *name_cursor;
806 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
807 const I32 no_expand = flags & GV_NOEXPAND;
808 const I32 add = flags & ~GV_NOADD_MASK;
809 const char *const name_end = nambeg + full_len;
810 const char *const name_em1 = name_end - 1;
812 if (flags & GV_NOTQUAL) {
813 /* Caller promised that there is no stash, so we can skip the check. */
818 if (full_len > 2 && *name == '*' && isALPHA(name[1])) {
819 /* accidental stringify on a GV? */
823 for (name_cursor = name; name_cursor < name_end; name_cursor++) {
824 if ((*name_cursor == ':' && name_cursor < name_em1
825 && name_cursor[1] == ':')
826 || (*name_cursor == '\'' && name_cursor[1]))
830 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
833 len = name_cursor - name;
838 if (len + 3 < (I32)sizeof (smallbuf))
841 Newx(tmpbuf, len+3, char);
842 Copy(name, tmpbuf, len, char);
846 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
847 gv = gvp ? *gvp : NULL;
848 if (gv && gv != (GV*)&PL_sv_undef) {
849 if (SvTYPE(gv) != SVt_PVGV)
850 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
854 if (tmpbuf != smallbuf)
856 if (!gv || gv == (GV*)&PL_sv_undef)
859 if (!(stash = GvHV(gv)))
860 stash = GvHV(gv) = newHV();
862 if (!HvNAME_get(stash))
863 hv_name_set(stash, nambeg, name_cursor - nambeg, 0);
866 if (*name_cursor == ':')
870 if (name == name_end)
871 return gv ? gv : (GV*)*hv_fetchs(PL_defstash, "main::", TRUE);
874 len = name_cursor - name;
876 /* No stash in name, so see how we can default */
880 if (len && isIDFIRST_lazy(name)) {
889 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
890 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
891 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
895 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
900 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
901 && name[3] == 'I' && name[4] == 'N')
905 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
906 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
907 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
911 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
912 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
920 else if (IN_PERL_COMPILETIME) {
922 if (add && (PL_hints & HINT_STRICT_VARS) &&
923 sv_type != SVt_PVCV &&
924 sv_type != SVt_PVGV &&
925 sv_type != SVt_PVFM &&
926 sv_type != SVt_PVIO &&
927 !(len == 1 && sv_type == SVt_PV &&
928 (*name == 'a' || *name == 'b')) )
930 gvp = (GV**)hv_fetch(stash,name,len,0);
932 *gvp == (GV*)&PL_sv_undef ||
933 SvTYPE(*gvp) != SVt_PVGV)
937 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
938 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
939 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
941 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
942 sv_type == SVt_PVAV ? '@' :
943 sv_type == SVt_PVHV ? '%' : '$',
946 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
952 stash = CopSTASH(PL_curcop);
958 /* By this point we should have a stash and a name */
962 SV * const err = Perl_mess(aTHX_
963 "Global symbol \"%s%s\" requires explicit package name",
964 (sv_type == SVt_PV ? "$"
965 : sv_type == SVt_PVAV ? "@"
966 : sv_type == SVt_PVHV ? "%"
969 if (USE_UTF8_IN_NAMES)
972 gv = gv_fetchpvn_flags("<none>::", 8, GV_ADDMULTI, SVt_PVHV);
974 /* symbol table under destruction */
983 if (!SvREFCNT(stash)) /* symbol table under destruction */
986 gvp = (GV**)hv_fetch(stash,name,len,add);
987 if (!gvp || *gvp == (GV*)&PL_sv_undef)
990 if (SvTYPE(gv) == SVt_PVGV) {
993 gv_init_sv(gv, sv_type);
994 if (sv_type == SVt_PVHV && len == 1 ) {
996 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
998 if (*name == '-' || *name == '+')
999 require_tie_mod(gv, name, newSVpvs("re::Tie::Hash::NamedCapture"), "FETCH", 0);
1004 } else if (no_init) {
1006 } else if (no_expand && SvROK(gv)) {
1010 /* Adding a new symbol */
1012 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
1013 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
1014 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
1015 gv_init_sv(gv, sv_type);
1017 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
1018 : (PL_dowarn & G_WARN_ON ) ) )
1021 /* set up magic where warranted */
1026 /* Nothing else to do.
1027 The compiler will probably turn the switch statement into a
1028 branch table. Make sure we avoid even that small overhead for
1029 the common case of lower case variable names. */
1033 const char * const name2 = name + 1;
1036 if (strEQ(name2, "RGV")) {
1037 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1039 else if (strEQ(name2, "RGVOUT")) {
1044 if (strnEQ(name2, "XPORT", 5))
1048 if (strEQ(name2, "SA")) {
1049 AV* const av = GvAVn(gv);
1051 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, NULL, 0);
1052 /* NOTE: No support for tied ISA */
1053 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
1054 && AvFILLp(av) == -1)
1057 av_push(av, newSVpvn(pname = "NDBM_File",9));
1058 gv_stashpvn(pname, 9, GV_ADD);
1059 av_push(av, newSVpvn(pname = "DB_File",7));
1060 gv_stashpvn(pname, 7, GV_ADD);
1061 av_push(av, newSVpvn(pname = "GDBM_File",9));
1062 gv_stashpvn(pname, 9, GV_ADD);
1063 av_push(av, newSVpvn(pname = "SDBM_File",9));
1064 gv_stashpvn(pname, 9, GV_ADD);
1065 av_push(av, newSVpvn(pname = "ODBM_File",9));
1066 gv_stashpvn(pname, 9, GV_ADD);
1071 if (strEQ(name2, "VERLOAD")) {
1072 HV* const hv = GvHVn(gv);
1074 hv_magic(hv, NULL, PERL_MAGIC_overload);
1078 if (strEQ(name2, "IG")) {
1082 Newxz(PL_psig_ptr, SIG_SIZE, SV*);
1083 Newxz(PL_psig_name, SIG_SIZE, SV*);
1084 Newxz(PL_psig_pend, SIG_SIZE, int);
1088 hv_magic(hv, NULL, PERL_MAGIC_sig);
1089 for (i = 1; i < SIG_SIZE; i++) {
1090 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1092 sv_setsv(*init, &PL_sv_undef);
1094 PL_psig_name[i] = 0;
1095 PL_psig_pend[i] = 0;
1100 if (strEQ(name2, "ERSION"))
1103 case '\003': /* $^CHILD_ERROR_NATIVE */
1104 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1107 case '\005': /* $^ENCODING */
1108 if (strEQ(name2, "NCODING"))
1111 case '\015': /* $^MATCH */
1112 if (strEQ(name2, "ATCH"))
1114 case '\017': /* $^OPEN */
1115 if (strEQ(name2, "PEN"))
1118 case '\020': /* $^PREMATCH $^POSTMATCH */
1119 if (strEQ(name2, "REMATCH") || strEQ(name2, "OSTMATCH"))
1121 case '\024': /* ${^TAINT} */
1122 if (strEQ(name2, "AINT"))
1125 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1126 if (strEQ(name2, "NICODE"))
1128 if (strEQ(name2, "TF8LOCALE"))
1130 if (strEQ(name2, "TF8CACHE"))
1133 case '\027': /* $^WARNING_BITS */
1134 if (strEQ(name2, "ARNING_BITS"))
1147 /* ensures variable is only digits */
1148 /* ${"1foo"} fails this test (and is thus writeable) */
1149 /* added by japhy, but borrowed from is_gv_magical */
1150 const char *end = name + len;
1151 while (--end > name) {
1152 if (!isDIGIT(*end)) return gv;
1159 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1160 be case '\0' in this switch statement (ie a default case) */
1166 sv_type == SVt_PVAV ||
1167 sv_type == SVt_PVHV ||
1168 sv_type == SVt_PVCV ||
1169 sv_type == SVt_PVFM ||
1172 PL_sawampersand = TRUE;
1176 sv_setpv(GvSVn(gv),PL_chopset);
1180 #ifdef COMPLEX_STATUS
1181 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1187 /* If %! has been used, automatically load Errno.pm. */
1189 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1191 /* magicalization must be done before require_tie_mod is called */
1192 if (sv_type == SVt_PVHV)
1193 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1198 GvMULTI_on(gv); /* no used once warnings here */
1200 bool plus = (*name == '+');
1201 SV *stashname = newSVpvs("re::Tie::Hash::NamedCapture");
1202 AV* const av = GvAVn(gv);
1203 HV *const hv = GvHVn(gv);
1204 HV *const hv_tie = newHV();
1205 SV *tie = newRV_noinc((SV*)hv_tie);
1207 sv_bless(tie, gv_stashsv(stashname,GV_ADD));
1208 hv_magic(hv, (GV*)tie, PERL_MAGIC_tied);
1209 sv_magic((SV*)av, (plus ? (SV*)av : NULL), PERL_MAGIC_regdata, NULL, 0);
1210 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1213 SvREADONLY_on(GvSVn(gv));
1215 Perl_hv_store(aTHX_ hv_tie, STR_WITH_LEN("all"), newSViv(1), 0);
1221 if (sv_type == SVt_PVHV)
1222 require_tie_mod(gv, name, stashname, "FETCH", 0);
1228 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1229 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1230 "$%c is no longer supported", *name);
1233 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1236 case '\010': /* $^H */
1238 HV *const hv = GvHVn(gv);
1239 hv_magic(hv, NULL, PERL_MAGIC_hints);
1242 case '\023': /* $^S */
1253 SvREADONLY_on(GvSVn(gv));
1268 case '\001': /* $^A */
1269 case '\003': /* $^C */
1270 case '\004': /* $^D */
1271 case '\005': /* $^E */
1272 case '\006': /* $^F */
1273 case '\011': /* $^I, NOT \t in EBCDIC */
1274 case '\016': /* $^N */
1275 case '\017': /* $^O */
1276 case '\020': /* $^P */
1277 case '\024': /* $^T */
1278 case '\027': /* $^W */
1280 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1283 case '\014': /* $^L */
1284 sv_setpvn(GvSVn(gv),"\f",1);
1285 PL_formfeed = GvSVn(gv);
1288 sv_setpvn(GvSVn(gv),"\034",1);
1292 SV * const sv = GvSVn(gv);
1293 if (!sv_derived_from(PL_patchlevel, "version"))
1294 upg_version(PL_patchlevel);
1295 GvSV(gv) = vnumify(PL_patchlevel);
1296 SvREADONLY_on(GvSV(gv));
1300 case '\026': /* $^V */
1302 SV * const sv = GvSVn(gv);
1303 GvSV(gv) = new_version(PL_patchlevel);
1304 SvREADONLY_on(GvSV(gv));
1314 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1318 const HV * const hv = GvSTASH(gv);
1323 sv_setpv(sv, prefix ? prefix : "");
1325 name = HvNAME_get(hv);
1327 namelen = HvNAMELEN_get(hv);
1333 if (keepmain || strNE(name, "main")) {
1334 sv_catpvn(sv,name,namelen);
1337 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1341 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1343 const GV * const egv = GvEGV(gv);
1344 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1352 IO * const io = (IO*)newSV(0);
1354 sv_upgrade((SV *)io,SVt_PVIO);
1355 /* This used to read SvREFCNT(io) = 1;
1356 It's not clear why the reference count needed an explicit reset. NWC
1358 assert (SvREFCNT(io) == 1);
1360 /* Clear the stashcache because a new IO could overrule a package name */
1361 hv_clear(PL_stashcache);
1362 iogv = gv_fetchpvs("FileHandle::", 0, SVt_PVHV);
1363 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1364 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1365 iogv = gv_fetchpvs("IO::Handle::", GV_ADD, SVt_PVHV);
1366 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1371 Perl_gv_check(pTHX_ const HV *stash)
1376 if (!HvARRAY(stash))
1378 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1380 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1383 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1384 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1386 if (hv != PL_defstash && hv != stash)
1387 gv_check(hv); /* nested package */
1389 else if (isALPHA(*HeKEY(entry))) {
1391 gv = (GV*)HeVAL(entry);
1392 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1395 /* performance hack: if filename is absolute and it's a standard
1396 * module, don't bother warning */
1397 #ifdef MACOS_TRADITIONAL
1398 # define LIB_COMPONENT ":lib:"
1400 # define LIB_COMPONENT "/lib/"
1403 && PERL_FILE_IS_ABSOLUTE(file)
1404 && (instr(file, LIB_COMPONENT) || instr(file, ".pm")))
1408 CopLINE_set(PL_curcop, GvLINE(gv));
1410 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1412 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1414 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1415 "Name \"%s::%s\" used only once: possible typo",
1416 HvNAME_get(stash), GvNAME(gv));
1423 Perl_newGVgen(pTHX_ const char *pack)
1426 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1430 /* hopefully this is only called on local symbol table entries */
1433 Perl_gp_ref(pTHX_ GP *gp)
1441 /* multi-named GPs cannot be used for method cache */
1442 SvREFCNT_dec(gp->gp_cv);
1447 /* Adding a new name to a subroutine invalidates method cache */
1448 PL_sub_generation++;
1455 Perl_gp_free(pTHX_ GV *gv)
1460 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
1462 if (gp->gp_refcnt == 0) {
1463 if (ckWARN_d(WARN_INTERNAL))
1464 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1465 "Attempt to free unreferenced glob pointers"
1466 pTHX__FORMAT pTHX__VALUE);
1470 /* Deleting the name of a subroutine invalidates method cache */
1471 PL_sub_generation++;
1473 if (--gp->gp_refcnt > 0) {
1474 if (gp->gp_egv == gv)
1480 if (gp->gp_file_hek)
1481 unshare_hek(gp->gp_file_hek);
1482 SvREFCNT_dec(gp->gp_sv);
1483 SvREFCNT_dec(gp->gp_av);
1484 /* FIXME - another reference loop GV -> symtab -> GV ?
1485 Somehow gp->gp_hv can end up pointing at freed garbage. */
1486 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1487 const char *hvname = HvNAME_get(gp->gp_hv);
1488 if (PL_stashcache && hvname)
1489 hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv),
1491 SvREFCNT_dec(gp->gp_hv);
1493 SvREFCNT_dec(gp->gp_io);
1494 SvREFCNT_dec(gp->gp_cv);
1495 SvREFCNT_dec(gp->gp_form);
1502 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1504 AMT * const amtp = (AMT*)mg->mg_ptr;
1505 PERL_UNUSED_ARG(sv);
1507 if (amtp && AMT_AMAGIC(amtp)) {
1509 for (i = 1; i < NofAMmeth; i++) {
1510 CV * const cv = amtp->table[i];
1512 SvREFCNT_dec((SV *) cv);
1513 amtp->table[i] = NULL;
1520 /* Updates and caches the CV's */
1523 Perl_Gv_AMupdate(pTHX_ HV *stash)
1526 MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1530 const AMT * const amtp = (AMT*)mg->mg_ptr;
1531 if (amtp->was_ok_am == PL_amagic_generation
1532 && amtp->was_ok_sub == PL_sub_generation) {
1533 return (bool)AMT_OVERLOADED(amtp);
1535 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1538 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1541 amt.was_ok_am = PL_amagic_generation;
1542 amt.was_ok_sub = PL_sub_generation;
1543 amt.fallback = AMGfallNO;
1547 int filled = 0, have_ovl = 0;
1550 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1552 /* Try to find via inheritance. */
1553 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1554 SV * const sv = gv ? GvSV(gv) : NULL;
1558 lim = DESTROY_amg; /* Skip overloading entries. */
1559 #ifdef PERL_DONT_CREATE_GVSV
1561 NOOP; /* Equivalent to !SvTRUE and !SvOK */
1564 else if (SvTRUE(sv))
1565 amt.fallback=AMGfallYES;
1567 amt.fallback=AMGfallNEVER;
1569 for (i = 1; i < lim; i++)
1570 amt.table[i] = NULL;
1571 for (; i < NofAMmeth; i++) {
1572 const char * const cooky = PL_AMG_names[i];
1573 /* Human-readable form, for debugging: */
1574 const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1575 const STRLEN l = strlen(cooky);
1577 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1578 cp, HvNAME_get(stash)) );
1579 /* don't fill the cache while looking up!
1580 Creation of inheritance stubs in intermediate packages may
1581 conflict with the logic of runtime method substitution.
1582 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1583 then we could have created stubs for "(+0" in A and C too.
1584 But if B overloads "bool", we may want to use it for
1585 numifying instead of C's "+0". */
1586 if (i >= DESTROY_amg)
1587 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1588 else /* Autoload taken care of below */
1589 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1591 if (gv && (cv = GvCV(gv))) {
1593 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1594 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1595 /* This is a hack to support autoloading..., while
1596 knowing *which* methods were declared as overloaded. */
1597 /* GvSV contains the name of the method. */
1599 SV *gvsv = GvSV(gv);
1601 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1602 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1603 (void*)GvSV(gv), cp, hvname) );
1604 if (!gvsv || !SvPOK(gvsv)
1605 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1608 /* Can be an import stub (created by "can"). */
1609 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1610 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1611 "in package \"%.256s\"",
1612 (GvCVGEN(gv) ? "Stub found while resolving"
1616 cv = GvCV(gv = ngv);
1618 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1619 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1620 GvNAME(CvGV(cv))) );
1622 if (i < DESTROY_amg)
1624 } else if (gv) { /* Autoloaded... */
1628 amt.table[i]=(CV*)SvREFCNT_inc_simple(cv);
1631 AMT_AMAGIC_on(&amt);
1633 AMT_OVERLOADED_on(&amt);
1634 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1635 (char*)&amt, sizeof(AMT));
1639 /* Here we have no table: */
1641 AMT_AMAGIC_off(&amt);
1642 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1643 (char*)&amt, sizeof(AMTS));
1649 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1655 if (!stash || !HvNAME_get(stash))
1657 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1661 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1664 amtp = (AMT*)mg->mg_ptr;
1665 if ( amtp->was_ok_am != PL_amagic_generation
1666 || amtp->was_ok_sub != PL_sub_generation )
1668 if (AMT_AMAGIC(amtp)) {
1669 CV * const ret = amtp->table[id];
1670 if (ret && isGV(ret)) { /* Autoloading stab */
1671 /* Passing it through may have resulted in a warning
1672 "Inherited AUTOLOAD for a non-method deprecated", since
1673 our caller is going through a function call, not a method call.
1674 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1675 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1688 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1693 CV **cvp=NULL, **ocvp=NULL;
1694 AMT *amtp=NULL, *oamtp=NULL;
1695 int off = 0, off1, lr = 0, notfound = 0;
1696 int postpr = 0, force_cpy = 0;
1697 int assign = AMGf_assign & flags;
1698 const int assignshift = assign ? 1 : 0;
1703 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1704 && (stash = SvSTASH(SvRV(left)))
1705 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1706 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1707 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1709 && ((cv = cvp[off=method+assignshift])
1710 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1716 cv = cvp[off=method])))) {
1717 lr = -1; /* Call method for left argument */
1719 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1722 /* look for substituted methods */
1723 /* In all the covered cases we should be called with assign==0. */
1727 if ((cv = cvp[off=add_ass_amg])
1728 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1729 right = &PL_sv_yes; lr = -1; assign = 1;
1734 if ((cv = cvp[off = subtr_ass_amg])
1735 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1736 right = &PL_sv_yes; lr = -1; assign = 1;
1740 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1743 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1746 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1749 (void)((cv = cvp[off=bool__amg])
1750 || (cv = cvp[off=numer_amg])
1751 || (cv = cvp[off=string_amg]));
1757 * SV* ref causes confusion with the interpreter variable of
1760 SV* const tmpRef=SvRV(left);
1761 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1763 * Just to be extra cautious. Maybe in some
1764 * additional cases sv_setsv is safe, too.
1766 SV* const newref = newSVsv(tmpRef);
1767 SvOBJECT_on(newref);
1768 /* As a bit of a source compatibility hack, SvAMAGIC() and
1769 friends dereference an RV, to behave the same was as when
1770 overloading was stored on the reference, not the referant.
1771 Hence we can't use SvAMAGIC_on()
1773 SvFLAGS(newref) |= SVf_AMAGIC;
1774 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1780 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1781 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1782 SV* const nullsv=sv_2mortal(newSViv(0));
1784 SV* const lessp = amagic_call(left,nullsv,
1785 lt_amg,AMGf_noright);
1786 logic = SvTRUE(lessp);
1788 SV* const lessp = amagic_call(left,nullsv,
1789 ncmp_amg,AMGf_noright);
1790 logic = (SvNV(lessp) < 0);
1793 if (off==subtr_amg) {
1804 if ((cv = cvp[off=subtr_amg])) {
1806 left = sv_2mortal(newSViv(0));
1811 case iter_amg: /* XXXX Eventually should do to_gv. */
1813 return NULL; /* Delegate operation to standard mechanisms. */
1821 return left; /* Delegate operation to standard mechanisms. */
1826 if (!cv) goto not_found;
1827 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1828 && (stash = SvSTASH(SvRV(right)))
1829 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1830 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1831 ? (amtp = (AMT*)mg->mg_ptr)->table
1833 && (cv = cvp[off=method])) { /* Method for right
1836 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1837 && (cvp=ocvp) && (lr = -1))
1838 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1839 && !(flags & AMGf_unary)) {
1840 /* We look for substitution for
1841 * comparison operations and
1843 if (method==concat_amg || method==concat_ass_amg
1844 || method==repeat_amg || method==repeat_ass_amg) {
1845 return NULL; /* Delegate operation to string conversion */
1855 postpr = 1; off=ncmp_amg; break;
1862 postpr = 1; off=scmp_amg; break;
1864 if (off != -1) cv = cvp[off];
1869 not_found: /* No method found, either report or croak */
1877 return left; /* Delegate operation to standard mechanisms. */
1880 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1881 notfound = 1; lr = -1;
1882 } else if (cvp && (cv=cvp[nomethod_amg])) {
1883 notfound = 1; lr = 1;
1884 } else if ((amtp && amtp->fallback >= AMGfallYES) && !DEBUG_o_TEST) {
1885 /* Skip generating the "no method found" message. */
1889 if (off==-1) off=method;
1890 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1891 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1892 AMG_id2name(method + assignshift),
1893 (flags & AMGf_unary ? " " : "\n\tleft "),
1895 "in overloaded package ":
1896 "has no overloaded magic",
1898 HvNAME_get(SvSTASH(SvRV(left))):
1901 ",\n\tright argument in overloaded package ":
1904 : ",\n\tright argument has no overloaded magic"),
1906 HvNAME_get(SvSTASH(SvRV(right))):
1908 if (amtp && amtp->fallback >= AMGfallYES) {
1909 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1911 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
1915 force_cpy = force_cpy || assign;
1920 DEBUG_o(Perl_deb(aTHX_
1921 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1923 method+assignshift==off? "" :
1925 method+assignshift==off? "" :
1926 AMG_id2name(method+assignshift),
1927 method+assignshift==off? "" : "\")",
1928 flags & AMGf_unary? "" :
1929 lr==1 ? " for right argument": " for left argument",
1930 flags & AMGf_unary? " for argument" : "",
1931 stash ? HvNAME_get(stash) : "null",
1932 fl? ",\n\tassignment variant used": "") );
1935 /* Since we use shallow copy during assignment, we need
1936 * to dublicate the contents, probably calling user-supplied
1937 * version of copy operator
1939 /* We need to copy in following cases:
1940 * a) Assignment form was called.
1941 * assignshift==1, assign==T, method + 1 == off
1942 * b) Increment or decrement, called directly.
1943 * assignshift==0, assign==0, method + 0 == off
1944 * c) Increment or decrement, translated to assignment add/subtr.
1945 * assignshift==0, assign==T,
1947 * d) Increment or decrement, translated to nomethod.
1948 * assignshift==0, assign==0,
1950 * e) Assignment form translated to nomethod.
1951 * assignshift==1, assign==T, method + 1 != off
1954 /* off is method, method+assignshift, or a result of opcode substitution.
1955 * In the latter case assignshift==0, so only notfound case is important.
1957 if (( (method + assignshift == off)
1958 && (assign || (method == inc_amg) || (method == dec_amg)))
1965 const bool oldcatch = CATCH_GET;
1968 Zero(&myop, 1, BINOP);
1969 myop.op_last = (OP *) &myop;
1970 myop.op_next = NULL;
1971 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1973 PUSHSTACKi(PERLSI_OVERLOAD);
1976 PL_op = (OP *) &myop;
1977 if (PERLDB_SUB && PL_curstash != PL_debstash)
1978 PL_op->op_private |= OPpENTERSUB_DB;
1982 EXTEND(SP, notfound + 5);
1983 PUSHs(lr>0? right: left);
1984 PUSHs(lr>0? left: right);
1985 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1987 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1992 if ((PL_op = Perl_pp_entersub(aTHX)))
2000 CATCH_SET(oldcatch);
2007 ans=SvIV(res)<=0; break;
2010 ans=SvIV(res)<0; break;
2013 ans=SvIV(res)>=0; break;
2016 ans=SvIV(res)>0; break;
2019 ans=SvIV(res)==0; break;
2022 ans=SvIV(res)!=0; break;
2025 SvSetSV(left,res); return left;
2027 ans=!SvTRUE(res); break;
2032 } else if (method==copy_amg) {
2034 Perl_croak(aTHX_ "Copy method did not return a reference");
2036 return SvREFCNT_inc(SvRV(res));
2044 =for apidoc is_gv_magical_sv
2046 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
2052 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
2055 const char * const temp = SvPV_const(name, len);
2056 return is_gv_magical(temp, len, flags);
2060 =for apidoc is_gv_magical
2062 Returns C<TRUE> if given the name of a magical GV.
2064 Currently only useful internally when determining if a GV should be
2065 created even in rvalue contexts.
2067 C<flags> is not used at present but available for future extension to
2068 allow selecting particular classes of magical variable.
2070 Currently assumes that C<name> is NUL terminated (as well as len being valid).
2071 This assumption is met by all callers within the perl core, which all pass
2072 pointers returned by SvPV.
2077 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
2079 PERL_UNUSED_CONTEXT;
2080 PERL_UNUSED_ARG(flags);
2083 const char * const name1 = name + 1;
2086 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
2090 if (len == 8 && strEQ(name1, "VERLOAD"))
2094 if (len == 3 && name[1] == 'I' && name[2] == 'G')
2097 /* Using ${^...} variables is likely to be sufficiently rare that
2098 it seems sensible to avoid the space hit of also checking the
2100 case '\017': /* ${^OPEN} */
2101 if (strEQ(name1, "PEN"))
2104 case '\024': /* ${^TAINT} */
2105 if (strEQ(name1, "AINT"))
2108 case '\025': /* ${^UNICODE} */
2109 if (strEQ(name1, "NICODE"))
2111 if (strEQ(name1, "TF8LOCALE"))
2114 case '\027': /* ${^WARNING_BITS} */
2115 if (strEQ(name1, "ARNING_BITS"))
2128 const char *end = name + len;
2129 while (--end > name) {
2137 /* Because we're already assuming that name is NUL terminated
2138 below, we can treat an empty name as "\0" */
2165 case '\001': /* $^A */
2166 case '\003': /* $^C */
2167 case '\004': /* $^D */
2168 case '\005': /* $^E */
2169 case '\006': /* $^F */
2170 case '\010': /* $^H */
2171 case '\011': /* $^I, NOT \t in EBCDIC */
2172 case '\014': /* $^L */
2173 case '\016': /* $^N */
2174 case '\017': /* $^O */
2175 case '\020': /* $^P */
2176 case '\023': /* $^S */
2177 case '\024': /* $^T */
2178 case '\026': /* $^V */
2179 case '\027': /* $^W */
2199 Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
2205 PERL_UNUSED_ARG(flags);
2208 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
2210 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
2211 unshare_hek(GvNAME_HEK(gv));
2214 PERL_HASH(hash, name, len);
2215 GvNAME_HEK(gv) = share_hek(name, len, hash);
2220 * c-indentation-style: bsd
2222 * indent-tabs-mode: t
2225 * ex: set ts=8 sts=4 sw=4 noet: