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) && gv != (GV*)&PL_sv_undef) ? 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) != (GV*)&PL_sv_undef && (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
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);
701 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
704 stash = gv_stashsv(namesv, 0);
706 Perl_croak( aTHX_ "panic: Can't use %%%s because %"SVf" is not available",
707 varpv, SVfARG(module));
708 else if (!gv_fetchmethod(stash, methpv))
709 Perl_croak( aTHX_ "panic: Can't use %%%s because %"SVf" does not support method %s",
710 varpv, SVfARG(module), methpv);
716 =for apidoc gv_stashpv
718 Returns a pointer to the stash for a specified package. Uses C<strlen> to
719 determine the length of C<name, then calls C<gv_stashpvn()>.
725 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
727 return gv_stashpvn(name, strlen(name), create);
731 =for apidoc gv_stashpvn
733 Returns a pointer to the stash for a specified package. The C<namelen>
734 parameter indicates the length of the C<name>, in bytes. C<flags> is passed
735 to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
736 created if it does not already exist. If the package does not exist and
737 C<flags> is 0 (or any other setting that does not create packages) then NULL
745 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
752 if (namelen + 2 <= sizeof smallbuf)
755 Newx(tmpbuf, namelen + 2, char);
756 Copy(name,tmpbuf,namelen,char);
757 tmpbuf[namelen++] = ':';
758 tmpbuf[namelen++] = ':';
759 tmpgv = gv_fetchpvn_flags(tmpbuf, namelen, flags, SVt_PVHV);
760 if (tmpbuf != smallbuf)
765 GvHV(tmpgv) = newHV();
767 if (!HvNAME_get(stash))
768 hv_name_set(stash, name, namelen, 0);
773 =for apidoc gv_stashsv
775 Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
781 Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
784 const char * const ptr = SvPV_const(sv,len);
785 return gv_stashpvn(ptr, len, flags);
790 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
791 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
795 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
797 const char * const nambeg = SvPV_const(name, len);
798 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
802 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
806 register const char *name = nambeg;
807 register GV *gv = NULL;
810 register const char *name_cursor;
812 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
813 const I32 no_expand = flags & GV_NOEXPAND;
814 const I32 add = flags & ~GV_NOADD_MASK;
815 const char *const name_end = nambeg + full_len;
816 const char *const name_em1 = name_end - 1;
818 if (flags & GV_NOTQUAL) {
819 /* Caller promised that there is no stash, so we can skip the check. */
824 if (full_len > 2 && *name == '*' && isALPHA(name[1])) {
825 /* accidental stringify on a GV? */
829 for (name_cursor = name; name_cursor < name_end; name_cursor++) {
830 if ((*name_cursor == ':' && name_cursor < name_em1
831 && name_cursor[1] == ':')
832 || (*name_cursor == '\'' && name_cursor[1]))
836 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
839 len = name_cursor - name;
844 if (len + 2 <= (I32)sizeof (smallbuf))
847 Newx(tmpbuf, len+2, char);
848 Copy(name, tmpbuf, len, char);
851 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
852 gv = gvp ? *gvp : NULL;
853 if (gv && gv != (GV*)&PL_sv_undef) {
854 if (SvTYPE(gv) != SVt_PVGV)
855 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
859 if (tmpbuf != smallbuf)
861 if (!gv || gv == (GV*)&PL_sv_undef)
864 if (!(stash = GvHV(gv)))
865 stash = GvHV(gv) = newHV();
867 if (!HvNAME_get(stash))
868 hv_name_set(stash, nambeg, name_cursor - nambeg, 0);
871 if (*name_cursor == ':')
875 if (name == name_end)
876 return gv ? gv : (GV*)*hv_fetchs(PL_defstash, "main::", TRUE);
879 len = name_cursor - name;
881 /* No stash in name, so see how we can default */
885 if (len && isIDFIRST_lazy(name)) {
894 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
895 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
896 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
900 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
905 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
906 && name[3] == 'I' && name[4] == 'N')
910 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
911 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
912 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
916 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
917 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
925 else if (IN_PERL_COMPILETIME) {
927 if (add && (PL_hints & HINT_STRICT_VARS) &&
928 sv_type != SVt_PVCV &&
929 sv_type != SVt_PVGV &&
930 sv_type != SVt_PVFM &&
931 sv_type != SVt_PVIO &&
932 !(len == 1 && sv_type == SVt_PV &&
933 (*name == 'a' || *name == 'b')) )
935 gvp = (GV**)hv_fetch(stash,name,len,0);
937 *gvp == (GV*)&PL_sv_undef ||
938 SvTYPE(*gvp) != SVt_PVGV)
942 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
943 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
944 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
946 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
947 sv_type == SVt_PVAV ? '@' :
948 sv_type == SVt_PVHV ? '%' : '$',
951 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
957 stash = CopSTASH(PL_curcop);
963 /* By this point we should have a stash and a name */
967 SV * const err = Perl_mess(aTHX_
968 "Global symbol \"%s%s\" requires explicit package name",
969 (sv_type == SVt_PV ? "$"
970 : sv_type == SVt_PVAV ? "@"
971 : sv_type == SVt_PVHV ? "%"
974 if (USE_UTF8_IN_NAMES)
977 gv = gv_fetchpvn_flags("<none>::", 8, GV_ADDMULTI, SVt_PVHV);
979 /* symbol table under destruction */
988 if (!SvREFCNT(stash)) /* symbol table under destruction */
991 gvp = (GV**)hv_fetch(stash,name,len,add);
992 if (!gvp || *gvp == (GV*)&PL_sv_undef)
995 if (SvTYPE(gv) == SVt_PVGV) {
998 gv_init_sv(gv, sv_type);
999 if (sv_type == SVt_PVHV && len == 1 ) {
1001 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1003 if (*name == '-' || *name == '+')
1004 require_tie_mod(gv, name, newSVpvs("re::Tie::Hash::NamedCapture"), "FETCH", 0);
1009 } else if (no_init) {
1011 } else if (no_expand && SvROK(gv)) {
1015 /* Adding a new symbol */
1017 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
1018 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
1019 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
1020 gv_init_sv(gv, sv_type);
1022 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
1023 : (PL_dowarn & G_WARN_ON ) ) )
1026 /* set up magic where warranted */
1031 /* Nothing else to do.
1032 The compiler will probably turn the switch statement into a
1033 branch table. Make sure we avoid even that small overhead for
1034 the common case of lower case variable names. */
1038 const char * const name2 = name + 1;
1041 if (strEQ(name2, "RGV")) {
1042 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1044 else if (strEQ(name2, "RGVOUT")) {
1049 if (strnEQ(name2, "XPORT", 5))
1053 if (strEQ(name2, "SA")) {
1054 AV* const av = GvAVn(gv);
1056 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, NULL, 0);
1057 /* NOTE: No support for tied ISA */
1058 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
1059 && AvFILLp(av) == -1)
1062 av_push(av, newSVpvn(pname = "NDBM_File",9));
1063 gv_stashpvn(pname, 9, GV_ADD);
1064 av_push(av, newSVpvn(pname = "DB_File",7));
1065 gv_stashpvn(pname, 7, GV_ADD);
1066 av_push(av, newSVpvn(pname = "GDBM_File",9));
1067 gv_stashpvn(pname, 9, GV_ADD);
1068 av_push(av, newSVpvn(pname = "SDBM_File",9));
1069 gv_stashpvn(pname, 9, GV_ADD);
1070 av_push(av, newSVpvn(pname = "ODBM_File",9));
1071 gv_stashpvn(pname, 9, GV_ADD);
1076 if (strEQ(name2, "VERLOAD")) {
1077 HV* const hv = GvHVn(gv);
1079 hv_magic(hv, NULL, PERL_MAGIC_overload);
1083 if (strEQ(name2, "IG")) {
1087 Newxz(PL_psig_ptr, SIG_SIZE, SV*);
1088 Newxz(PL_psig_name, SIG_SIZE, SV*);
1089 Newxz(PL_psig_pend, SIG_SIZE, int);
1093 hv_magic(hv, NULL, PERL_MAGIC_sig);
1094 for (i = 1; i < SIG_SIZE; i++) {
1095 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1097 sv_setsv(*init, &PL_sv_undef);
1099 PL_psig_name[i] = 0;
1100 PL_psig_pend[i] = 0;
1105 if (strEQ(name2, "ERSION"))
1108 case '\003': /* $^CHILD_ERROR_NATIVE */
1109 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1112 case '\005': /* $^ENCODING */
1113 if (strEQ(name2, "NCODING"))
1116 case '\015': /* $^MATCH */
1117 if (strEQ(name2, "ATCH"))
1119 case '\017': /* $^OPEN */
1120 if (strEQ(name2, "PEN"))
1123 case '\020': /* $^PREMATCH $^POSTMATCH */
1124 if (strEQ(name2, "REMATCH") || strEQ(name2, "OSTMATCH"))
1126 case '\024': /* ${^TAINT} */
1127 if (strEQ(name2, "AINT"))
1130 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1131 if (strEQ(name2, "NICODE"))
1133 if (strEQ(name2, "TF8LOCALE"))
1135 if (strEQ(name2, "TF8CACHE"))
1138 case '\027': /* $^WARNING_BITS */
1139 if (strEQ(name2, "ARNING_BITS"))
1152 /* ensures variable is only digits */
1153 /* ${"1foo"} fails this test (and is thus writeable) */
1154 /* added by japhy, but borrowed from is_gv_magical */
1155 const char *end = name + len;
1156 while (--end > name) {
1157 if (!isDIGIT(*end)) return gv;
1164 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1165 be case '\0' in this switch statement (ie a default case) */
1171 sv_type == SVt_PVAV ||
1172 sv_type == SVt_PVHV ||
1173 sv_type == SVt_PVCV ||
1174 sv_type == SVt_PVFM ||
1177 PL_sawampersand = TRUE;
1181 sv_setpv(GvSVn(gv),PL_chopset);
1185 #ifdef COMPLEX_STATUS
1186 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1192 /* If %! has been used, automatically load Errno.pm. */
1194 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1196 /* magicalization must be done before require_tie_mod is called */
1197 if (sv_type == SVt_PVHV)
1198 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1203 GvMULTI_on(gv); /* no used once warnings here */
1205 bool plus = (*name == '+');
1206 SV *stashname = newSVpvs("re::Tie::Hash::NamedCapture");
1207 AV* const av = GvAVn(gv);
1208 HV *const hv = GvHVn(gv);
1209 HV *const hv_tie = newHV();
1210 SV *tie = newRV_noinc((SV*)hv_tie);
1212 sv_bless(tie, gv_stashsv(stashname,GV_ADD));
1213 hv_magic(hv, (GV*)tie, PERL_MAGIC_tied);
1214 sv_magic((SV*)av, (plus ? (SV*)av : NULL), PERL_MAGIC_regdata, NULL, 0);
1215 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1218 SvREADONLY_on(GvSVn(gv));
1220 Perl_hv_store(aTHX_ hv_tie, STR_WITH_LEN("all"), newSViv(1), 0);
1226 if (sv_type == SVt_PVHV)
1227 require_tie_mod(gv, name, stashname, "FETCH", 0);
1233 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1234 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1235 "$%c is no longer supported", *name);
1238 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1241 case '\010': /* $^H */
1243 HV *const hv = GvHVn(gv);
1244 hv_magic(hv, NULL, PERL_MAGIC_hints);
1247 case '\023': /* $^S */
1258 SvREADONLY_on(GvSVn(gv));
1273 case '\001': /* $^A */
1274 case '\003': /* $^C */
1275 case '\004': /* $^D */
1276 case '\005': /* $^E */
1277 case '\006': /* $^F */
1278 case '\011': /* $^I, NOT \t in EBCDIC */
1279 case '\016': /* $^N */
1280 case '\017': /* $^O */
1281 case '\020': /* $^P */
1282 case '\024': /* $^T */
1283 case '\027': /* $^W */
1285 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1288 case '\014': /* $^L */
1289 sv_setpvn(GvSVn(gv),"\f",1);
1290 PL_formfeed = GvSVn(gv);
1293 sv_setpvn(GvSVn(gv),"\034",1);
1297 SV * const sv = GvSVn(gv);
1298 if (!sv_derived_from(PL_patchlevel, "version"))
1299 upg_version(PL_patchlevel);
1300 GvSV(gv) = vnumify(PL_patchlevel);
1301 SvREADONLY_on(GvSV(gv));
1305 case '\026': /* $^V */
1307 SV * const sv = GvSVn(gv);
1308 GvSV(gv) = new_version(PL_patchlevel);
1309 SvREADONLY_on(GvSV(gv));
1319 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1323 const HV * const hv = GvSTASH(gv);
1328 sv_setpv(sv, prefix ? prefix : "");
1330 name = HvNAME_get(hv);
1332 namelen = HvNAMELEN_get(hv);
1338 if (keepmain || strNE(name, "main")) {
1339 sv_catpvn(sv,name,namelen);
1342 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1346 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1348 const GV * const egv = GvEGV(gv);
1349 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1357 IO * const io = (IO*)newSV(0);
1359 sv_upgrade((SV *)io,SVt_PVIO);
1360 /* This used to read SvREFCNT(io) = 1;
1361 It's not clear why the reference count needed an explicit reset. NWC
1363 assert (SvREFCNT(io) == 1);
1365 /* Clear the stashcache because a new IO could overrule a package name */
1366 hv_clear(PL_stashcache);
1367 iogv = gv_fetchpvs("FileHandle::", 0, SVt_PVHV);
1368 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1369 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1370 iogv = gv_fetchpvs("IO::Handle::", GV_ADD, SVt_PVHV);
1371 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1376 Perl_gv_check(pTHX_ const HV *stash)
1381 if (!HvARRAY(stash))
1383 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1385 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1388 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1389 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1391 if (hv != PL_defstash && hv != stash)
1392 gv_check(hv); /* nested package */
1394 else if (isALPHA(*HeKEY(entry))) {
1396 gv = (GV*)HeVAL(entry);
1397 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1400 /* performance hack: if filename is absolute and it's a standard
1401 * module, don't bother warning */
1402 #ifdef MACOS_TRADITIONAL
1403 # define LIB_COMPONENT ":lib:"
1405 # define LIB_COMPONENT "/lib/"
1408 && PERL_FILE_IS_ABSOLUTE(file)
1409 && (instr(file, LIB_COMPONENT) || instr(file, ".pm")))
1413 CopLINE_set(PL_curcop, GvLINE(gv));
1415 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1417 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1419 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1420 "Name \"%s::%s\" used only once: possible typo",
1421 HvNAME_get(stash), GvNAME(gv));
1428 Perl_newGVgen(pTHX_ const char *pack)
1431 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1435 /* hopefully this is only called on local symbol table entries */
1438 Perl_gp_ref(pTHX_ GP *gp)
1446 /* multi-named GPs cannot be used for method cache */
1447 SvREFCNT_dec(gp->gp_cv);
1452 /* Adding a new name to a subroutine invalidates method cache */
1453 PL_sub_generation++;
1460 Perl_gp_free(pTHX_ GV *gv)
1465 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
1467 if (gp->gp_refcnt == 0) {
1468 if (ckWARN_d(WARN_INTERNAL))
1469 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1470 "Attempt to free unreferenced glob pointers"
1471 pTHX__FORMAT pTHX__VALUE);
1475 /* Deleting the name of a subroutine invalidates method cache */
1476 PL_sub_generation++;
1478 if (--gp->gp_refcnt > 0) {
1479 if (gp->gp_egv == gv)
1485 if (gp->gp_file_hek)
1486 unshare_hek(gp->gp_file_hek);
1487 SvREFCNT_dec(gp->gp_sv);
1488 SvREFCNT_dec(gp->gp_av);
1489 /* FIXME - another reference loop GV -> symtab -> GV ?
1490 Somehow gp->gp_hv can end up pointing at freed garbage. */
1491 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1492 const char *hvname = HvNAME_get(gp->gp_hv);
1493 if (PL_stashcache && hvname)
1494 hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv),
1496 SvREFCNT_dec(gp->gp_hv);
1498 SvREFCNT_dec(gp->gp_io);
1499 SvREFCNT_dec(gp->gp_cv);
1500 SvREFCNT_dec(gp->gp_form);
1507 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1509 AMT * const amtp = (AMT*)mg->mg_ptr;
1510 PERL_UNUSED_ARG(sv);
1512 if (amtp && AMT_AMAGIC(amtp)) {
1514 for (i = 1; i < NofAMmeth; i++) {
1515 CV * const cv = amtp->table[i];
1517 SvREFCNT_dec((SV *) cv);
1518 amtp->table[i] = NULL;
1525 /* Updates and caches the CV's */
1528 Perl_Gv_AMupdate(pTHX_ HV *stash)
1531 MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1535 const AMT * const amtp = (AMT*)mg->mg_ptr;
1536 if (amtp->was_ok_am == PL_amagic_generation
1537 && amtp->was_ok_sub == PL_sub_generation) {
1538 return (bool)AMT_OVERLOADED(amtp);
1540 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1543 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1546 amt.was_ok_am = PL_amagic_generation;
1547 amt.was_ok_sub = PL_sub_generation;
1548 amt.fallback = AMGfallNO;
1552 int filled = 0, have_ovl = 0;
1555 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1557 /* Try to find via inheritance. */
1558 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1559 SV * const sv = gv ? GvSV(gv) : NULL;
1563 lim = DESTROY_amg; /* Skip overloading entries. */
1564 #ifdef PERL_DONT_CREATE_GVSV
1566 NOOP; /* Equivalent to !SvTRUE and !SvOK */
1569 else if (SvTRUE(sv))
1570 amt.fallback=AMGfallYES;
1572 amt.fallback=AMGfallNEVER;
1574 for (i = 1; i < lim; i++)
1575 amt.table[i] = NULL;
1576 for (; i < NofAMmeth; i++) {
1577 const char * const cooky = PL_AMG_names[i];
1578 /* Human-readable form, for debugging: */
1579 const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1580 const STRLEN l = strlen(cooky);
1582 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1583 cp, HvNAME_get(stash)) );
1584 /* don't fill the cache while looking up!
1585 Creation of inheritance stubs in intermediate packages may
1586 conflict with the logic of runtime method substitution.
1587 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1588 then we could have created stubs for "(+0" in A and C too.
1589 But if B overloads "bool", we may want to use it for
1590 numifying instead of C's "+0". */
1591 if (i >= DESTROY_amg)
1592 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1593 else /* Autoload taken care of below */
1594 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1596 if (gv && (cv = GvCV(gv))) {
1598 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1599 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1600 /* This is a hack to support autoloading..., while
1601 knowing *which* methods were declared as overloaded. */
1602 /* GvSV contains the name of the method. */
1604 SV *gvsv = GvSV(gv);
1606 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1607 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1608 (void*)GvSV(gv), cp, hvname) );
1609 if (!gvsv || !SvPOK(gvsv)
1610 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1613 /* Can be an import stub (created by "can"). */
1614 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1615 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1616 "in package \"%.256s\"",
1617 (GvCVGEN(gv) ? "Stub found while resolving"
1621 cv = GvCV(gv = ngv);
1623 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1624 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1625 GvNAME(CvGV(cv))) );
1627 if (i < DESTROY_amg)
1629 } else if (gv) { /* Autoloaded... */
1633 amt.table[i]=(CV*)SvREFCNT_inc_simple(cv);
1636 AMT_AMAGIC_on(&amt);
1638 AMT_OVERLOADED_on(&amt);
1639 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1640 (char*)&amt, sizeof(AMT));
1644 /* Here we have no table: */
1646 AMT_AMAGIC_off(&amt);
1647 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1648 (char*)&amt, sizeof(AMTS));
1654 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1660 if (!stash || !HvNAME_get(stash))
1662 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1666 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1669 amtp = (AMT*)mg->mg_ptr;
1670 if ( amtp->was_ok_am != PL_amagic_generation
1671 || amtp->was_ok_sub != PL_sub_generation )
1673 if (AMT_AMAGIC(amtp)) {
1674 CV * const ret = amtp->table[id];
1675 if (ret && isGV(ret)) { /* Autoloading stab */
1676 /* Passing it through may have resulted in a warning
1677 "Inherited AUTOLOAD for a non-method deprecated", since
1678 our caller is going through a function call, not a method call.
1679 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1680 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1693 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1698 CV **cvp=NULL, **ocvp=NULL;
1699 AMT *amtp=NULL, *oamtp=NULL;
1700 int off = 0, off1, lr = 0, notfound = 0;
1701 int postpr = 0, force_cpy = 0;
1702 int assign = AMGf_assign & flags;
1703 const int assignshift = assign ? 1 : 0;
1708 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1709 && (stash = SvSTASH(SvRV(left)))
1710 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1711 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1712 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1714 && ((cv = cvp[off=method+assignshift])
1715 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1721 cv = cvp[off=method])))) {
1722 lr = -1; /* Call method for left argument */
1724 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1727 /* look for substituted methods */
1728 /* In all the covered cases we should be called with assign==0. */
1732 if ((cv = cvp[off=add_ass_amg])
1733 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1734 right = &PL_sv_yes; lr = -1; assign = 1;
1739 if ((cv = cvp[off = subtr_ass_amg])
1740 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1741 right = &PL_sv_yes; lr = -1; assign = 1;
1745 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1748 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1751 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1754 (void)((cv = cvp[off=bool__amg])
1755 || (cv = cvp[off=numer_amg])
1756 || (cv = cvp[off=string_amg]));
1762 * SV* ref causes confusion with the interpreter variable of
1765 SV* const tmpRef=SvRV(left);
1766 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1768 * Just to be extra cautious. Maybe in some
1769 * additional cases sv_setsv is safe, too.
1771 SV* const newref = newSVsv(tmpRef);
1772 SvOBJECT_on(newref);
1773 /* As a bit of a source compatibility hack, SvAMAGIC() and
1774 friends dereference an RV, to behave the same was as when
1775 overloading was stored on the reference, not the referant.
1776 Hence we can't use SvAMAGIC_on()
1778 SvFLAGS(newref) |= SVf_AMAGIC;
1779 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1785 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1786 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1787 SV* const nullsv=sv_2mortal(newSViv(0));
1789 SV* const lessp = amagic_call(left,nullsv,
1790 lt_amg,AMGf_noright);
1791 logic = SvTRUE(lessp);
1793 SV* const lessp = amagic_call(left,nullsv,
1794 ncmp_amg,AMGf_noright);
1795 logic = (SvNV(lessp) < 0);
1798 if (off==subtr_amg) {
1809 if ((cv = cvp[off=subtr_amg])) {
1811 left = sv_2mortal(newSViv(0));
1816 case iter_amg: /* XXXX Eventually should do to_gv. */
1818 return NULL; /* Delegate operation to standard mechanisms. */
1826 return left; /* Delegate operation to standard mechanisms. */
1831 if (!cv) goto not_found;
1832 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1833 && (stash = SvSTASH(SvRV(right)))
1834 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1835 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1836 ? (amtp = (AMT*)mg->mg_ptr)->table
1838 && (cv = cvp[off=method])) { /* Method for right
1841 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1842 && (cvp=ocvp) && (lr = -1))
1843 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1844 && !(flags & AMGf_unary)) {
1845 /* We look for substitution for
1846 * comparison operations and
1848 if (method==concat_amg || method==concat_ass_amg
1849 || method==repeat_amg || method==repeat_ass_amg) {
1850 return NULL; /* Delegate operation to string conversion */
1860 postpr = 1; off=ncmp_amg; break;
1867 postpr = 1; off=scmp_amg; break;
1869 if (off != -1) cv = cvp[off];
1874 not_found: /* No method found, either report or croak */
1882 return left; /* Delegate operation to standard mechanisms. */
1885 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1886 notfound = 1; lr = -1;
1887 } else if (cvp && (cv=cvp[nomethod_amg])) {
1888 notfound = 1; lr = 1;
1889 } else if ((amtp && amtp->fallback >= AMGfallYES) && !DEBUG_o_TEST) {
1890 /* Skip generating the "no method found" message. */
1894 if (off==-1) off=method;
1895 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1896 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1897 AMG_id2name(method + assignshift),
1898 (flags & AMGf_unary ? " " : "\n\tleft "),
1900 "in overloaded package ":
1901 "has no overloaded magic",
1903 HvNAME_get(SvSTASH(SvRV(left))):
1906 ",\n\tright argument in overloaded package ":
1909 : ",\n\tright argument has no overloaded magic"),
1911 HvNAME_get(SvSTASH(SvRV(right))):
1913 if (amtp && amtp->fallback >= AMGfallYES) {
1914 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1916 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
1920 force_cpy = force_cpy || assign;
1925 DEBUG_o(Perl_deb(aTHX_
1926 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1928 method+assignshift==off? "" :
1930 method+assignshift==off? "" :
1931 AMG_id2name(method+assignshift),
1932 method+assignshift==off? "" : "\")",
1933 flags & AMGf_unary? "" :
1934 lr==1 ? " for right argument": " for left argument",
1935 flags & AMGf_unary? " for argument" : "",
1936 stash ? HvNAME_get(stash) : "null",
1937 fl? ",\n\tassignment variant used": "") );
1940 /* Since we use shallow copy during assignment, we need
1941 * to dublicate the contents, probably calling user-supplied
1942 * version of copy operator
1944 /* We need to copy in following cases:
1945 * a) Assignment form was called.
1946 * assignshift==1, assign==T, method + 1 == off
1947 * b) Increment or decrement, called directly.
1948 * assignshift==0, assign==0, method + 0 == off
1949 * c) Increment or decrement, translated to assignment add/subtr.
1950 * assignshift==0, assign==T,
1952 * d) Increment or decrement, translated to nomethod.
1953 * assignshift==0, assign==0,
1955 * e) Assignment form translated to nomethod.
1956 * assignshift==1, assign==T, method + 1 != off
1959 /* off is method, method+assignshift, or a result of opcode substitution.
1960 * In the latter case assignshift==0, so only notfound case is important.
1962 if (( (method + assignshift == off)
1963 && (assign || (method == inc_amg) || (method == dec_amg)))
1970 const bool oldcatch = CATCH_GET;
1973 Zero(&myop, 1, BINOP);
1974 myop.op_last = (OP *) &myop;
1975 myop.op_next = NULL;
1976 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1978 PUSHSTACKi(PERLSI_OVERLOAD);
1981 PL_op = (OP *) &myop;
1982 if (PERLDB_SUB && PL_curstash != PL_debstash)
1983 PL_op->op_private |= OPpENTERSUB_DB;
1987 EXTEND(SP, notfound + 5);
1988 PUSHs(lr>0? right: left);
1989 PUSHs(lr>0? left: right);
1990 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1992 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1997 if ((PL_op = Perl_pp_entersub(aTHX)))
2005 CATCH_SET(oldcatch);
2012 ans=SvIV(res)<=0; break;
2015 ans=SvIV(res)<0; break;
2018 ans=SvIV(res)>=0; break;
2021 ans=SvIV(res)>0; break;
2024 ans=SvIV(res)==0; break;
2027 ans=SvIV(res)!=0; break;
2030 SvSetSV(left,res); return left;
2032 ans=!SvTRUE(res); break;
2037 } else if (method==copy_amg) {
2039 Perl_croak(aTHX_ "Copy method did not return a reference");
2041 return SvREFCNT_inc(SvRV(res));
2049 =for apidoc is_gv_magical_sv
2051 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
2057 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
2060 const char * const temp = SvPV_const(name, len);
2061 return is_gv_magical(temp, len, flags);
2065 =for apidoc is_gv_magical
2067 Returns C<TRUE> if given the name of a magical GV.
2069 Currently only useful internally when determining if a GV should be
2070 created even in rvalue contexts.
2072 C<flags> is not used at present but available for future extension to
2073 allow selecting particular classes of magical variable.
2075 Currently assumes that C<name> is NUL terminated (as well as len being valid).
2076 This assumption is met by all callers within the perl core, which all pass
2077 pointers returned by SvPV.
2082 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
2084 PERL_UNUSED_CONTEXT;
2085 PERL_UNUSED_ARG(flags);
2088 const char * const name1 = name + 1;
2091 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
2095 if (len == 8 && strEQ(name1, "VERLOAD"))
2099 if (len == 3 && name[1] == 'I' && name[2] == 'G')
2102 /* Using ${^...} variables is likely to be sufficiently rare that
2103 it seems sensible to avoid the space hit of also checking the
2105 case '\017': /* ${^OPEN} */
2106 if (strEQ(name1, "PEN"))
2109 case '\024': /* ${^TAINT} */
2110 if (strEQ(name1, "AINT"))
2113 case '\025': /* ${^UNICODE} */
2114 if (strEQ(name1, "NICODE"))
2116 if (strEQ(name1, "TF8LOCALE"))
2119 case '\027': /* ${^WARNING_BITS} */
2120 if (strEQ(name1, "ARNING_BITS"))
2133 const char *end = name + len;
2134 while (--end > name) {
2142 /* Because we're already assuming that name is NUL terminated
2143 below, we can treat an empty name as "\0" */
2170 case '\001': /* $^A */
2171 case '\003': /* $^C */
2172 case '\004': /* $^D */
2173 case '\005': /* $^E */
2174 case '\006': /* $^F */
2175 case '\010': /* $^H */
2176 case '\011': /* $^I, NOT \t in EBCDIC */
2177 case '\014': /* $^L */
2178 case '\016': /* $^N */
2179 case '\017': /* $^O */
2180 case '\020': /* $^P */
2181 case '\023': /* $^S */
2182 case '\024': /* $^T */
2183 case '\026': /* $^V */
2184 case '\027': /* $^W */
2204 Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
2210 PERL_UNUSED_ARG(flags);
2213 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
2215 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
2216 unshare_hek(GvNAME_HEK(gv));
2219 PERL_HASH(hash, name, len);
2220 GvNAME_HEK(gv) = share_hek(name, len, hash);
2225 * c-indentation-style: bsd
2227 * indent-tabs-mode: t
2230 * ex: set ts=8 sts=4 sw=4 noet: