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 + 2 < sizeof smallbuf)
748 Newx(tmpbuf, namelen + 2, char);
749 Copy(name,tmpbuf,namelen,char);
750 tmpbuf[namelen++] = ':';
751 tmpbuf[namelen++] = ':';
752 tmpgv = gv_fetchpvn_flags(tmpbuf, namelen, flags, SVt_PVHV);
753 if (tmpbuf != smallbuf)
758 GvHV(tmpgv) = newHV();
760 if (!HvNAME_get(stash))
761 hv_name_set(stash, name, namelen, 0);
766 =for apidoc gv_stashsv
768 Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
774 Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
777 const char * const ptr = SvPV_const(sv,len);
778 return gv_stashpvn(ptr, len, flags);
783 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
784 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
788 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
790 const char * const nambeg = SvPV_const(name, len);
791 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
795 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
799 register const char *name = nambeg;
800 register GV *gv = NULL;
803 register const char *name_cursor;
805 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
806 const I32 no_expand = flags & GV_NOEXPAND;
807 const I32 add = flags & ~GV_NOADD_MASK;
808 const char *const name_end = nambeg + full_len;
809 const char *const name_em1 = name_end - 1;
811 if (flags & GV_NOTQUAL) {
812 /* Caller promised that there is no stash, so we can skip the check. */
817 if (full_len > 2 && *name == '*' && isALPHA(name[1])) {
818 /* accidental stringify on a GV? */
822 for (name_cursor = name; name_cursor < name_end; name_cursor++) {
823 if ((*name_cursor == ':' && name_cursor < name_em1
824 && name_cursor[1] == ':')
825 || (*name_cursor == '\'' && name_cursor[1]))
829 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
832 len = name_cursor - name;
837 if (len + 2 < (I32)sizeof (smallbuf))
840 Newx(tmpbuf, len+2, char);
841 Copy(name, tmpbuf, len, char);
844 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
845 gv = gvp ? *gvp : NULL;
846 if (gv && gv != (GV*)&PL_sv_undef) {
847 if (SvTYPE(gv) != SVt_PVGV)
848 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
852 if (tmpbuf != smallbuf)
854 if (!gv || gv == (GV*)&PL_sv_undef)
857 if (!(stash = GvHV(gv)))
858 stash = GvHV(gv) = newHV();
860 if (!HvNAME_get(stash))
861 hv_name_set(stash, nambeg, name_cursor - nambeg, 0);
864 if (*name_cursor == ':')
868 if (name == name_end)
869 return gv ? gv : (GV*)*hv_fetchs(PL_defstash, "main::", TRUE);
872 len = name_cursor - name;
874 /* No stash in name, so see how we can default */
878 if (len && isIDFIRST_lazy(name)) {
887 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
888 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
889 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
893 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
898 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
899 && name[3] == 'I' && name[4] == 'N')
903 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
904 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
905 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
909 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
910 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
918 else if (IN_PERL_COMPILETIME) {
920 if (add && (PL_hints & HINT_STRICT_VARS) &&
921 sv_type != SVt_PVCV &&
922 sv_type != SVt_PVGV &&
923 sv_type != SVt_PVFM &&
924 sv_type != SVt_PVIO &&
925 !(len == 1 && sv_type == SVt_PV &&
926 (*name == 'a' || *name == 'b')) )
928 gvp = (GV**)hv_fetch(stash,name,len,0);
930 *gvp == (GV*)&PL_sv_undef ||
931 SvTYPE(*gvp) != SVt_PVGV)
935 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
936 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
937 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
939 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
940 sv_type == SVt_PVAV ? '@' :
941 sv_type == SVt_PVHV ? '%' : '$',
944 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
950 stash = CopSTASH(PL_curcop);
956 /* By this point we should have a stash and a name */
960 SV * const err = Perl_mess(aTHX_
961 "Global symbol \"%s%s\" requires explicit package name",
962 (sv_type == SVt_PV ? "$"
963 : sv_type == SVt_PVAV ? "@"
964 : sv_type == SVt_PVHV ? "%"
967 if (USE_UTF8_IN_NAMES)
970 gv = gv_fetchpvn_flags("<none>::", 8, GV_ADDMULTI, SVt_PVHV);
972 /* symbol table under destruction */
981 if (!SvREFCNT(stash)) /* symbol table under destruction */
984 gvp = (GV**)hv_fetch(stash,name,len,add);
985 if (!gvp || *gvp == (GV*)&PL_sv_undef)
988 if (SvTYPE(gv) == SVt_PVGV) {
991 gv_init_sv(gv, sv_type);
992 if (sv_type == SVt_PVHV && len == 1 ) {
994 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
996 if (*name == '-' || *name == '+')
997 require_tie_mod(gv, name, newSVpvs("re::Tie::Hash::NamedCapture"), "FETCH", 0);
1002 } else if (no_init) {
1004 } else if (no_expand && SvROK(gv)) {
1008 /* Adding a new symbol */
1010 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
1011 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
1012 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
1013 gv_init_sv(gv, sv_type);
1015 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
1016 : (PL_dowarn & G_WARN_ON ) ) )
1019 /* set up magic where warranted */
1024 /* Nothing else to do.
1025 The compiler will probably turn the switch statement into a
1026 branch table. Make sure we avoid even that small overhead for
1027 the common case of lower case variable names. */
1031 const char * const name2 = name + 1;
1034 if (strEQ(name2, "RGV")) {
1035 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1037 else if (strEQ(name2, "RGVOUT")) {
1042 if (strnEQ(name2, "XPORT", 5))
1046 if (strEQ(name2, "SA")) {
1047 AV* const av = GvAVn(gv);
1049 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, NULL, 0);
1050 /* NOTE: No support for tied ISA */
1051 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
1052 && AvFILLp(av) == -1)
1055 av_push(av, newSVpvn(pname = "NDBM_File",9));
1056 gv_stashpvn(pname, 9, GV_ADD);
1057 av_push(av, newSVpvn(pname = "DB_File",7));
1058 gv_stashpvn(pname, 7, GV_ADD);
1059 av_push(av, newSVpvn(pname = "GDBM_File",9));
1060 gv_stashpvn(pname, 9, GV_ADD);
1061 av_push(av, newSVpvn(pname = "SDBM_File",9));
1062 gv_stashpvn(pname, 9, GV_ADD);
1063 av_push(av, newSVpvn(pname = "ODBM_File",9));
1064 gv_stashpvn(pname, 9, GV_ADD);
1069 if (strEQ(name2, "VERLOAD")) {
1070 HV* const hv = GvHVn(gv);
1072 hv_magic(hv, NULL, PERL_MAGIC_overload);
1076 if (strEQ(name2, "IG")) {
1080 Newxz(PL_psig_ptr, SIG_SIZE, SV*);
1081 Newxz(PL_psig_name, SIG_SIZE, SV*);
1082 Newxz(PL_psig_pend, SIG_SIZE, int);
1086 hv_magic(hv, NULL, PERL_MAGIC_sig);
1087 for (i = 1; i < SIG_SIZE; i++) {
1088 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1090 sv_setsv(*init, &PL_sv_undef);
1092 PL_psig_name[i] = 0;
1093 PL_psig_pend[i] = 0;
1098 if (strEQ(name2, "ERSION"))
1101 case '\003': /* $^CHILD_ERROR_NATIVE */
1102 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1105 case '\005': /* $^ENCODING */
1106 if (strEQ(name2, "NCODING"))
1109 case '\015': /* $^MATCH */
1110 if (strEQ(name2, "ATCH"))
1112 case '\017': /* $^OPEN */
1113 if (strEQ(name2, "PEN"))
1116 case '\020': /* $^PREMATCH $^POSTMATCH */
1117 if (strEQ(name2, "REMATCH") || strEQ(name2, "OSTMATCH"))
1119 case '\024': /* ${^TAINT} */
1120 if (strEQ(name2, "AINT"))
1123 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1124 if (strEQ(name2, "NICODE"))
1126 if (strEQ(name2, "TF8LOCALE"))
1128 if (strEQ(name2, "TF8CACHE"))
1131 case '\027': /* $^WARNING_BITS */
1132 if (strEQ(name2, "ARNING_BITS"))
1145 /* ensures variable is only digits */
1146 /* ${"1foo"} fails this test (and is thus writeable) */
1147 /* added by japhy, but borrowed from is_gv_magical */
1148 const char *end = name + len;
1149 while (--end > name) {
1150 if (!isDIGIT(*end)) return gv;
1157 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1158 be case '\0' in this switch statement (ie a default case) */
1164 sv_type == SVt_PVAV ||
1165 sv_type == SVt_PVHV ||
1166 sv_type == SVt_PVCV ||
1167 sv_type == SVt_PVFM ||
1170 PL_sawampersand = TRUE;
1174 sv_setpv(GvSVn(gv),PL_chopset);
1178 #ifdef COMPLEX_STATUS
1179 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1185 /* If %! has been used, automatically load Errno.pm. */
1187 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1189 /* magicalization must be done before require_tie_mod is called */
1190 if (sv_type == SVt_PVHV)
1191 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1196 GvMULTI_on(gv); /* no used once warnings here */
1198 bool plus = (*name == '+');
1199 SV *stashname = newSVpvs("re::Tie::Hash::NamedCapture");
1200 AV* const av = GvAVn(gv);
1201 HV *const hv = GvHVn(gv);
1202 HV *const hv_tie = newHV();
1203 SV *tie = newRV_noinc((SV*)hv_tie);
1205 sv_bless(tie, gv_stashsv(stashname,GV_ADD));
1206 hv_magic(hv, (GV*)tie, PERL_MAGIC_tied);
1207 sv_magic((SV*)av, (plus ? (SV*)av : NULL), PERL_MAGIC_regdata, NULL, 0);
1208 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1211 SvREADONLY_on(GvSVn(gv));
1213 Perl_hv_store(aTHX_ hv_tie, STR_WITH_LEN("all"), newSViv(1), 0);
1219 if (sv_type == SVt_PVHV)
1220 require_tie_mod(gv, name, stashname, "FETCH", 0);
1226 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1227 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1228 "$%c is no longer supported", *name);
1231 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1234 case '\010': /* $^H */
1236 HV *const hv = GvHVn(gv);
1237 hv_magic(hv, NULL, PERL_MAGIC_hints);
1240 case '\023': /* $^S */
1251 SvREADONLY_on(GvSVn(gv));
1266 case '\001': /* $^A */
1267 case '\003': /* $^C */
1268 case '\004': /* $^D */
1269 case '\005': /* $^E */
1270 case '\006': /* $^F */
1271 case '\011': /* $^I, NOT \t in EBCDIC */
1272 case '\016': /* $^N */
1273 case '\017': /* $^O */
1274 case '\020': /* $^P */
1275 case '\024': /* $^T */
1276 case '\027': /* $^W */
1278 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1281 case '\014': /* $^L */
1282 sv_setpvn(GvSVn(gv),"\f",1);
1283 PL_formfeed = GvSVn(gv);
1286 sv_setpvn(GvSVn(gv),"\034",1);
1290 SV * const sv = GvSVn(gv);
1291 if (!sv_derived_from(PL_patchlevel, "version"))
1292 upg_version(PL_patchlevel);
1293 GvSV(gv) = vnumify(PL_patchlevel);
1294 SvREADONLY_on(GvSV(gv));
1298 case '\026': /* $^V */
1300 SV * const sv = GvSVn(gv);
1301 GvSV(gv) = new_version(PL_patchlevel);
1302 SvREADONLY_on(GvSV(gv));
1312 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1316 const HV * const hv = GvSTASH(gv);
1321 sv_setpv(sv, prefix ? prefix : "");
1323 name = HvNAME_get(hv);
1325 namelen = HvNAMELEN_get(hv);
1331 if (keepmain || strNE(name, "main")) {
1332 sv_catpvn(sv,name,namelen);
1335 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1339 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1341 const GV * const egv = GvEGV(gv);
1342 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1350 IO * const io = (IO*)newSV(0);
1352 sv_upgrade((SV *)io,SVt_PVIO);
1353 /* This used to read SvREFCNT(io) = 1;
1354 It's not clear why the reference count needed an explicit reset. NWC
1356 assert (SvREFCNT(io) == 1);
1358 /* Clear the stashcache because a new IO could overrule a package name */
1359 hv_clear(PL_stashcache);
1360 iogv = gv_fetchpvs("FileHandle::", 0, SVt_PVHV);
1361 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1362 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1363 iogv = gv_fetchpvs("IO::Handle::", GV_ADD, SVt_PVHV);
1364 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1369 Perl_gv_check(pTHX_ const HV *stash)
1374 if (!HvARRAY(stash))
1376 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1378 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1381 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1382 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1384 if (hv != PL_defstash && hv != stash)
1385 gv_check(hv); /* nested package */
1387 else if (isALPHA(*HeKEY(entry))) {
1389 gv = (GV*)HeVAL(entry);
1390 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1393 /* performance hack: if filename is absolute and it's a standard
1394 * module, don't bother warning */
1395 #ifdef MACOS_TRADITIONAL
1396 # define LIB_COMPONENT ":lib:"
1398 # define LIB_COMPONENT "/lib/"
1401 && PERL_FILE_IS_ABSOLUTE(file)
1402 && (instr(file, LIB_COMPONENT) || instr(file, ".pm")))
1406 CopLINE_set(PL_curcop, GvLINE(gv));
1408 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1410 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1412 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1413 "Name \"%s::%s\" used only once: possible typo",
1414 HvNAME_get(stash), GvNAME(gv));
1421 Perl_newGVgen(pTHX_ const char *pack)
1424 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1428 /* hopefully this is only called on local symbol table entries */
1431 Perl_gp_ref(pTHX_ GP *gp)
1439 /* multi-named GPs cannot be used for method cache */
1440 SvREFCNT_dec(gp->gp_cv);
1445 /* Adding a new name to a subroutine invalidates method cache */
1446 PL_sub_generation++;
1453 Perl_gp_free(pTHX_ GV *gv)
1458 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
1460 if (gp->gp_refcnt == 0) {
1461 if (ckWARN_d(WARN_INTERNAL))
1462 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1463 "Attempt to free unreferenced glob pointers"
1464 pTHX__FORMAT pTHX__VALUE);
1468 /* Deleting the name of a subroutine invalidates method cache */
1469 PL_sub_generation++;
1471 if (--gp->gp_refcnt > 0) {
1472 if (gp->gp_egv == gv)
1478 if (gp->gp_file_hek)
1479 unshare_hek(gp->gp_file_hek);
1480 SvREFCNT_dec(gp->gp_sv);
1481 SvREFCNT_dec(gp->gp_av);
1482 /* FIXME - another reference loop GV -> symtab -> GV ?
1483 Somehow gp->gp_hv can end up pointing at freed garbage. */
1484 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1485 const char *hvname = HvNAME_get(gp->gp_hv);
1486 if (PL_stashcache && hvname)
1487 hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv),
1489 SvREFCNT_dec(gp->gp_hv);
1491 SvREFCNT_dec(gp->gp_io);
1492 SvREFCNT_dec(gp->gp_cv);
1493 SvREFCNT_dec(gp->gp_form);
1500 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1502 AMT * const amtp = (AMT*)mg->mg_ptr;
1503 PERL_UNUSED_ARG(sv);
1505 if (amtp && AMT_AMAGIC(amtp)) {
1507 for (i = 1; i < NofAMmeth; i++) {
1508 CV * const cv = amtp->table[i];
1510 SvREFCNT_dec((SV *) cv);
1511 amtp->table[i] = NULL;
1518 /* Updates and caches the CV's */
1521 Perl_Gv_AMupdate(pTHX_ HV *stash)
1524 MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1528 const AMT * const amtp = (AMT*)mg->mg_ptr;
1529 if (amtp->was_ok_am == PL_amagic_generation
1530 && amtp->was_ok_sub == PL_sub_generation) {
1531 return (bool)AMT_OVERLOADED(amtp);
1533 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1536 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1539 amt.was_ok_am = PL_amagic_generation;
1540 amt.was_ok_sub = PL_sub_generation;
1541 amt.fallback = AMGfallNO;
1545 int filled = 0, have_ovl = 0;
1548 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1550 /* Try to find via inheritance. */
1551 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1552 SV * const sv = gv ? GvSV(gv) : NULL;
1556 lim = DESTROY_amg; /* Skip overloading entries. */
1557 #ifdef PERL_DONT_CREATE_GVSV
1559 NOOP; /* Equivalent to !SvTRUE and !SvOK */
1562 else if (SvTRUE(sv))
1563 amt.fallback=AMGfallYES;
1565 amt.fallback=AMGfallNEVER;
1567 for (i = 1; i < lim; i++)
1568 amt.table[i] = NULL;
1569 for (; i < NofAMmeth; i++) {
1570 const char * const cooky = PL_AMG_names[i];
1571 /* Human-readable form, for debugging: */
1572 const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1573 const STRLEN l = strlen(cooky);
1575 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1576 cp, HvNAME_get(stash)) );
1577 /* don't fill the cache while looking up!
1578 Creation of inheritance stubs in intermediate packages may
1579 conflict with the logic of runtime method substitution.
1580 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1581 then we could have created stubs for "(+0" in A and C too.
1582 But if B overloads "bool", we may want to use it for
1583 numifying instead of C's "+0". */
1584 if (i >= DESTROY_amg)
1585 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1586 else /* Autoload taken care of below */
1587 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1589 if (gv && (cv = GvCV(gv))) {
1591 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1592 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1593 /* This is a hack to support autoloading..., while
1594 knowing *which* methods were declared as overloaded. */
1595 /* GvSV contains the name of the method. */
1597 SV *gvsv = GvSV(gv);
1599 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1600 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1601 (void*)GvSV(gv), cp, hvname) );
1602 if (!gvsv || !SvPOK(gvsv)
1603 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1606 /* Can be an import stub (created by "can"). */
1607 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1608 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1609 "in package \"%.256s\"",
1610 (GvCVGEN(gv) ? "Stub found while resolving"
1614 cv = GvCV(gv = ngv);
1616 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1617 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1618 GvNAME(CvGV(cv))) );
1620 if (i < DESTROY_amg)
1622 } else if (gv) { /* Autoloaded... */
1626 amt.table[i]=(CV*)SvREFCNT_inc_simple(cv);
1629 AMT_AMAGIC_on(&amt);
1631 AMT_OVERLOADED_on(&amt);
1632 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1633 (char*)&amt, sizeof(AMT));
1637 /* Here we have no table: */
1639 AMT_AMAGIC_off(&amt);
1640 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1641 (char*)&amt, sizeof(AMTS));
1647 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1653 if (!stash || !HvNAME_get(stash))
1655 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1659 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1662 amtp = (AMT*)mg->mg_ptr;
1663 if ( amtp->was_ok_am != PL_amagic_generation
1664 || amtp->was_ok_sub != PL_sub_generation )
1666 if (AMT_AMAGIC(amtp)) {
1667 CV * const ret = amtp->table[id];
1668 if (ret && isGV(ret)) { /* Autoloading stab */
1669 /* Passing it through may have resulted in a warning
1670 "Inherited AUTOLOAD for a non-method deprecated", since
1671 our caller is going through a function call, not a method call.
1672 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1673 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1686 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1691 CV **cvp=NULL, **ocvp=NULL;
1692 AMT *amtp=NULL, *oamtp=NULL;
1693 int off = 0, off1, lr = 0, notfound = 0;
1694 int postpr = 0, force_cpy = 0;
1695 int assign = AMGf_assign & flags;
1696 const int assignshift = assign ? 1 : 0;
1701 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1702 && (stash = SvSTASH(SvRV(left)))
1703 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1704 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1705 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1707 && ((cv = cvp[off=method+assignshift])
1708 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1714 cv = cvp[off=method])))) {
1715 lr = -1; /* Call method for left argument */
1717 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1720 /* look for substituted methods */
1721 /* In all the covered cases we should be called with assign==0. */
1725 if ((cv = cvp[off=add_ass_amg])
1726 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1727 right = &PL_sv_yes; lr = -1; assign = 1;
1732 if ((cv = cvp[off = subtr_ass_amg])
1733 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1734 right = &PL_sv_yes; lr = -1; assign = 1;
1738 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1741 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1744 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1747 (void)((cv = cvp[off=bool__amg])
1748 || (cv = cvp[off=numer_amg])
1749 || (cv = cvp[off=string_amg]));
1755 * SV* ref causes confusion with the interpreter variable of
1758 SV* const tmpRef=SvRV(left);
1759 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1761 * Just to be extra cautious. Maybe in some
1762 * additional cases sv_setsv is safe, too.
1764 SV* const newref = newSVsv(tmpRef);
1765 SvOBJECT_on(newref);
1766 /* As a bit of a source compatibility hack, SvAMAGIC() and
1767 friends dereference an RV, to behave the same was as when
1768 overloading was stored on the reference, not the referant.
1769 Hence we can't use SvAMAGIC_on()
1771 SvFLAGS(newref) |= SVf_AMAGIC;
1772 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1778 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1779 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1780 SV* const nullsv=sv_2mortal(newSViv(0));
1782 SV* const lessp = amagic_call(left,nullsv,
1783 lt_amg,AMGf_noright);
1784 logic = SvTRUE(lessp);
1786 SV* const lessp = amagic_call(left,nullsv,
1787 ncmp_amg,AMGf_noright);
1788 logic = (SvNV(lessp) < 0);
1791 if (off==subtr_amg) {
1802 if ((cv = cvp[off=subtr_amg])) {
1804 left = sv_2mortal(newSViv(0));
1809 case iter_amg: /* XXXX Eventually should do to_gv. */
1811 return NULL; /* Delegate operation to standard mechanisms. */
1819 return left; /* Delegate operation to standard mechanisms. */
1824 if (!cv) goto not_found;
1825 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1826 && (stash = SvSTASH(SvRV(right)))
1827 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1828 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1829 ? (amtp = (AMT*)mg->mg_ptr)->table
1831 && (cv = cvp[off=method])) { /* Method for right
1834 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1835 && (cvp=ocvp) && (lr = -1))
1836 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1837 && !(flags & AMGf_unary)) {
1838 /* We look for substitution for
1839 * comparison operations and
1841 if (method==concat_amg || method==concat_ass_amg
1842 || method==repeat_amg || method==repeat_ass_amg) {
1843 return NULL; /* Delegate operation to string conversion */
1853 postpr = 1; off=ncmp_amg; break;
1860 postpr = 1; off=scmp_amg; break;
1862 if (off != -1) cv = cvp[off];
1867 not_found: /* No method found, either report or croak */
1875 return left; /* Delegate operation to standard mechanisms. */
1878 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1879 notfound = 1; lr = -1;
1880 } else if (cvp && (cv=cvp[nomethod_amg])) {
1881 notfound = 1; lr = 1;
1882 } else if ((amtp && amtp->fallback >= AMGfallYES) && !DEBUG_o_TEST) {
1883 /* Skip generating the "no method found" message. */
1887 if (off==-1) off=method;
1888 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1889 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1890 AMG_id2name(method + assignshift),
1891 (flags & AMGf_unary ? " " : "\n\tleft "),
1893 "in overloaded package ":
1894 "has no overloaded magic",
1896 HvNAME_get(SvSTASH(SvRV(left))):
1899 ",\n\tright argument in overloaded package ":
1902 : ",\n\tright argument has no overloaded magic"),
1904 HvNAME_get(SvSTASH(SvRV(right))):
1906 if (amtp && amtp->fallback >= AMGfallYES) {
1907 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1909 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
1913 force_cpy = force_cpy || assign;
1918 DEBUG_o(Perl_deb(aTHX_
1919 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1921 method+assignshift==off? "" :
1923 method+assignshift==off? "" :
1924 AMG_id2name(method+assignshift),
1925 method+assignshift==off? "" : "\")",
1926 flags & AMGf_unary? "" :
1927 lr==1 ? " for right argument": " for left argument",
1928 flags & AMGf_unary? " for argument" : "",
1929 stash ? HvNAME_get(stash) : "null",
1930 fl? ",\n\tassignment variant used": "") );
1933 /* Since we use shallow copy during assignment, we need
1934 * to dublicate the contents, probably calling user-supplied
1935 * version of copy operator
1937 /* We need to copy in following cases:
1938 * a) Assignment form was called.
1939 * assignshift==1, assign==T, method + 1 == off
1940 * b) Increment or decrement, called directly.
1941 * assignshift==0, assign==0, method + 0 == off
1942 * c) Increment or decrement, translated to assignment add/subtr.
1943 * assignshift==0, assign==T,
1945 * d) Increment or decrement, translated to nomethod.
1946 * assignshift==0, assign==0,
1948 * e) Assignment form translated to nomethod.
1949 * assignshift==1, assign==T, method + 1 != off
1952 /* off is method, method+assignshift, or a result of opcode substitution.
1953 * In the latter case assignshift==0, so only notfound case is important.
1955 if (( (method + assignshift == off)
1956 && (assign || (method == inc_amg) || (method == dec_amg)))
1963 const bool oldcatch = CATCH_GET;
1966 Zero(&myop, 1, BINOP);
1967 myop.op_last = (OP *) &myop;
1968 myop.op_next = NULL;
1969 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1971 PUSHSTACKi(PERLSI_OVERLOAD);
1974 PL_op = (OP *) &myop;
1975 if (PERLDB_SUB && PL_curstash != PL_debstash)
1976 PL_op->op_private |= OPpENTERSUB_DB;
1980 EXTEND(SP, notfound + 5);
1981 PUSHs(lr>0? right: left);
1982 PUSHs(lr>0? left: right);
1983 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1985 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1990 if ((PL_op = Perl_pp_entersub(aTHX)))
1998 CATCH_SET(oldcatch);
2005 ans=SvIV(res)<=0; break;
2008 ans=SvIV(res)<0; break;
2011 ans=SvIV(res)>=0; break;
2014 ans=SvIV(res)>0; break;
2017 ans=SvIV(res)==0; break;
2020 ans=SvIV(res)!=0; break;
2023 SvSetSV(left,res); return left;
2025 ans=!SvTRUE(res); break;
2030 } else if (method==copy_amg) {
2032 Perl_croak(aTHX_ "Copy method did not return a reference");
2034 return SvREFCNT_inc(SvRV(res));
2042 =for apidoc is_gv_magical_sv
2044 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
2050 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
2053 const char * const temp = SvPV_const(name, len);
2054 return is_gv_magical(temp, len, flags);
2058 =for apidoc is_gv_magical
2060 Returns C<TRUE> if given the name of a magical GV.
2062 Currently only useful internally when determining if a GV should be
2063 created even in rvalue contexts.
2065 C<flags> is not used at present but available for future extension to
2066 allow selecting particular classes of magical variable.
2068 Currently assumes that C<name> is NUL terminated (as well as len being valid).
2069 This assumption is met by all callers within the perl core, which all pass
2070 pointers returned by SvPV.
2075 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
2077 PERL_UNUSED_CONTEXT;
2078 PERL_UNUSED_ARG(flags);
2081 const char * const name1 = name + 1;
2084 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
2088 if (len == 8 && strEQ(name1, "VERLOAD"))
2092 if (len == 3 && name[1] == 'I' && name[2] == 'G')
2095 /* Using ${^...} variables is likely to be sufficiently rare that
2096 it seems sensible to avoid the space hit of also checking the
2098 case '\017': /* ${^OPEN} */
2099 if (strEQ(name1, "PEN"))
2102 case '\024': /* ${^TAINT} */
2103 if (strEQ(name1, "AINT"))
2106 case '\025': /* ${^UNICODE} */
2107 if (strEQ(name1, "NICODE"))
2109 if (strEQ(name1, "TF8LOCALE"))
2112 case '\027': /* ${^WARNING_BITS} */
2113 if (strEQ(name1, "ARNING_BITS"))
2126 const char *end = name + len;
2127 while (--end > name) {
2135 /* Because we're already assuming that name is NUL terminated
2136 below, we can treat an empty name as "\0" */
2163 case '\001': /* $^A */
2164 case '\003': /* $^C */
2165 case '\004': /* $^D */
2166 case '\005': /* $^E */
2167 case '\006': /* $^F */
2168 case '\010': /* $^H */
2169 case '\011': /* $^I, NOT \t in EBCDIC */
2170 case '\014': /* $^L */
2171 case '\016': /* $^N */
2172 case '\017': /* $^O */
2173 case '\020': /* $^P */
2174 case '\023': /* $^S */
2175 case '\024': /* $^T */
2176 case '\026': /* $^V */
2177 case '\027': /* $^W */
2197 Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
2203 PERL_UNUSED_ARG(flags);
2206 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
2208 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
2209 unshare_hek(GvNAME_HEK(gv));
2212 PERL_HASH(hash, name, len);
2213 GvNAME_HEK(gv) = share_hek(name, len, hash);
2218 * c-indentation-style: bsd
2220 * indent-tabs-mode: t
2223 * ex: set ts=8 sts=4 sw=4 noet: