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;
263 mro_method_changed_in(GvSTASH(gv)); /* sub Foo::bar($) { (shift) } sub ASDF::baz($); *ASDF::baz = \&Foo::bar */
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
295 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
296 If we just cast GvSVn(gv) to void, it ignores evaluating it for
304 =for apidoc gv_fetchmeth
306 Returns the glob with the given C<name> and a defined subroutine or
307 C<NULL>. The glob lives in the given C<stash>, or in the stashes
308 accessible via @ISA and UNIVERSAL::.
310 The argument C<level> should be either 0 or -1. If C<level==0>, as a
311 side-effect creates a glob with the given C<name> in the given C<stash>
312 which in the case of success contains an alias for the subroutine, and sets
313 up caching info for this glob.
315 This function grants C<"SUPER"> token as a postfix of the stash name. The
316 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
317 visible to Perl code. So when calling C<call_sv>, you should not use
318 the GV directly; instead, you should use the method's CV, which can be
319 obtained from the GV with the C<GvCV> macro.
324 /* NOTE: No support for tied ISA */
327 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
335 GV* candidate = NULL;
340 I32 create = (level >= 0) ? 1 : 0;
345 /* UNIVERSAL methods should be callable without a stash */
347 create = 0; /* probably appropriate */
348 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
354 hvname = HvNAME_get(stash);
356 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
361 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
363 topgen_cmp = HvMROMETA(stash)->sub_generation + PL_sub_generation;
365 /* check locally for a real method or a cache entry */
366 gvp = (GV**)hv_fetch(stash, name, len, create);
370 if (SvTYPE(topgv) != SVt_PVGV)
371 gv_init(topgv, stash, name, len, TRUE);
372 if ((cand_cv = GvCV(topgv))) {
373 /* If genuine method or valid cache entry, use it */
374 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
378 /* stale cache entry, junk it and move on */
379 SvREFCNT_dec(cand_cv);
380 GvCV(topgv) = cand_cv = NULL;
384 else if (GvCVGEN(topgv) == topgen_cmp) {
385 /* cache indicates no such method definitively */
390 packlen = HvNAMELEN_get(stash);
391 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
394 basestash = gv_stashpvn(hvname, packlen, GV_ADD);
395 linear_av = mro_get_linear_isa(basestash);
398 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
401 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
402 items = AvFILLp(linear_av); /* no +1, to skip over self */
404 linear_sv = *linear_svp++;
406 cstash = gv_stashsv(linear_sv, 0);
408 /* mg.c:Perl_magic_setisa sets the fake flag on packages it had
409 to create that the user did not. The "package" statement
410 clears it. We also check if there's anything in the symbol
411 table at all, which would indicate a previously "fake" package
412 where someone adding things via $Foo::Bar = 1 without ever
413 using a "package" statement.
414 This was all neccesary because magic_setisa needs a place to
415 keep isarev information on packages that aren't yet defined,
416 yet we still need to issue this warning when appropriate.
418 if (!cstash || (HvMROMETA(cstash)->fake && !HvFILL(cstash))) {
419 if (ckWARN(WARN_SYNTAX))
420 Perl_warner(aTHX_ packWARN(WARN_SYNTAX), "Can't locate package %"SVf" for @%s::ISA",
421 SVfARG(linear_sv), hvname);
427 gvp = (GV**)hv_fetch(cstash, name, len, 0);
431 if (SvTYPE(candidate) != SVt_PVGV) gv_init(candidate, cstash, name, len, TRUE);
432 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
434 * Found real method, cache method in topgv if:
435 * 1. topgv has no synonyms (else inheritance crosses wires)
436 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
438 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
439 if ((old_cv = GvCV(topgv))) SvREFCNT_dec(old_cv);
440 SvREFCNT_inc_simple_void_NN(cand_cv);
441 GvCV(topgv) = cand_cv;
442 GvCVGEN(topgv) = topgen_cmp;
448 /* Check UNIVERSAL without caching */
449 if(level == 0 || level == -1) {
450 candidate = gv_fetchmeth(NULL, name, len, 1);
452 cand_cv = GvCV(candidate);
453 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
454 if ((old_cv = GvCV(topgv))) SvREFCNT_dec(old_cv);
455 SvREFCNT_inc_simple_void_NN(cand_cv);
456 GvCV(topgv) = cand_cv;
457 GvCVGEN(topgv) = topgen_cmp;
463 if (topgv && GvREFCNT(topgv) == 1) {
464 /* cache the fact that the method is not defined */
465 GvCVGEN(topgv) = topgen_cmp;
472 =for apidoc gv_fetchmeth_autoload
474 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
475 Returns a glob for the subroutine.
477 For an autoloaded subroutine without a GV, will create a GV even
478 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
479 of the result may be zero.
485 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
487 GV *gv = gv_fetchmeth(stash, name, len, level);
494 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
495 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
497 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
500 if (!(CvROOT(cv) || CvXSUB(cv)))
502 /* Have an autoload */
503 if (level < 0) /* Cannot do without a stub */
504 gv_fetchmeth(stash, name, len, 0);
505 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
514 =for apidoc gv_fetchmethod_autoload
516 Returns the glob which contains the subroutine to call to invoke the method
517 on the C<stash>. In fact in the presence of autoloading this may be the
518 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
521 The third parameter of C<gv_fetchmethod_autoload> determines whether
522 AUTOLOAD lookup is performed if the given method is not present: non-zero
523 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
524 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
525 with a non-zero C<autoload> parameter.
527 These functions grant C<"SUPER"> token as a prefix of the method name. Note
528 that if you want to keep the returned glob for a long time, you need to
529 check for it being "AUTOLOAD", since at the later time the call may load a
530 different subroutine due to $AUTOLOAD changing its value. Use the glob
531 created via a side effect to do this.
533 These functions have the same side-effects and as C<gv_fetchmeth> with
534 C<level==0>. C<name> should be writable if contains C<':'> or C<'
535 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
536 C<call_sv> apply equally to these functions.
542 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
545 register const char *nend;
546 const char *nsplit = NULL;
550 if (stash && SvTYPE(stash) < SVt_PVHV)
553 for (nend = name; *nend; nend++) {
556 else if (*nend == ':' && *(nend + 1) == ':')
560 const char * const origname = name;
564 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
565 /* ->SUPER::method should really be looked up in original stash */
566 SV * const tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
567 CopSTASHPV(PL_curcop)));
568 /* __PACKAGE__::SUPER stash should be autovivified */
569 stash = gv_stashpvn(SvPVX_const(tmpstr), SvCUR(tmpstr), GV_ADD);
570 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
571 origname, HvNAME_get(stash), name) );
574 /* don't autovifify if ->NoSuchStash::method */
575 stash = gv_stashpvn(origname, nsplit - origname, 0);
577 /* however, explicit calls to Pkg::SUPER::method may
578 happen, and may require autovivification to work */
579 if (!stash && (nsplit - origname) >= 7 &&
580 strnEQ(nsplit - 7, "::SUPER", 7) &&
581 gv_stashpvn(origname, nsplit - origname - 7, 0))
582 stash = gv_stashpvn(origname, nsplit - origname, GV_ADD);
587 gv = gv_fetchmeth(stash, name, nend - name, 0);
589 if (strEQ(name,"import") || strEQ(name,"unimport"))
590 gv = (GV*)&PL_sv_yes;
592 gv = gv_autoload4(ostash, name, nend - name, TRUE);
595 CV* const cv = GvCV(gv);
596 if (!CvROOT(cv) && !CvXSUB(cv)) {
604 if (GvCV(stubgv) != cv) /* orphaned import */
607 autogv = gv_autoload4(GvSTASH(stubgv),
608 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
618 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
626 const char *packname = "";
627 STRLEN packname_len = 0;
629 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
632 if (SvTYPE(stash) < SVt_PVHV) {
633 packname = SvPV_const((SV*)stash, packname_len);
637 packname = HvNAME_get(stash);
638 packname_len = HvNAMELEN_get(stash);
641 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
645 if (!(CvROOT(cv) || CvXSUB(cv)))
649 * Inheriting AUTOLOAD for non-methods works ... for now.
651 if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
652 && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)
654 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
655 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
656 packname, (int)len, name);
659 /* rather than lookup/init $AUTOLOAD here
660 * only to have the XSUB do another lookup for $AUTOLOAD
661 * and split that value on the last '::',
662 * pass along the same data via some unused fields in the CV
665 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
671 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
672 * The subroutine's original name may not be "AUTOLOAD", so we don't
673 * use that, but for lack of anything better we will use the sub's
674 * original package to look up $AUTOLOAD.
676 varstash = GvSTASH(CvGV(cv));
677 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
681 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
682 #ifdef PERL_DONT_CREATE_GVSV
683 GvSV(vargv) = newSV(0);
687 varsv = GvSVn(vargv);
688 sv_setpvn(varsv, packname, packname_len);
689 sv_catpvs(varsv, "::");
690 sv_catpvn(varsv, name, len);
695 /* require_tie_mod() internal routine for requiring a module
696 * that implements the logic of automatical ties like %! and %-
698 * The "gv" parameter should be the glob.
699 * "varpv" holds the name of the var, used for error messages.
700 * "namesv" holds the module name. Its refcount will be decremented.
701 * "methpv" holds the method name to test for to check that things
702 * are working reasonably close to as expected.
703 * "flags": if flag & 1 then save the scalar before loading.
704 * For the protection of $! to work (it is set by this routine)
705 * the sv slot must already be magicalized.
708 S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
711 HV* stash = gv_stashsv(namesv, 0);
713 if (!stash || !(gv_fetchmethod(stash, methpv))) {
714 SV *module = newSVsv(namesv);
715 char varname = *varpv; /* varpv might be clobbered by load_module,
716 so save it. For the moment it's always
722 PUSHSTACKi(PERLSI_MAGIC);
723 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
727 stash = gv_stashsv(namesv, 0);
729 Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" is not available",
730 varname, SVfARG(namesv));
731 else if (!gv_fetchmethod(stash, methpv))
732 Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" does not support method %s",
733 varname, SVfARG(namesv), methpv);
735 SvREFCNT_dec(namesv);
740 =for apidoc gv_stashpv
742 Returns a pointer to the stash for a specified package. Uses C<strlen> to
743 determine the length of C<name>, then calls C<gv_stashpvn()>.
749 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
751 return gv_stashpvn(name, strlen(name), create);
755 =for apidoc gv_stashpvn
757 Returns a pointer to the stash for a specified package. The C<namelen>
758 parameter indicates the length of the C<name>, in bytes. C<flags> is passed
759 to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
760 created if it does not already exist. If the package does not exist and
761 C<flags> is 0 (or any other setting that does not create packages) then NULL
769 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
776 if (namelen + 2 <= sizeof smallbuf)
779 Newx(tmpbuf, namelen + 2, char);
780 Copy(name,tmpbuf,namelen,char);
781 tmpbuf[namelen++] = ':';
782 tmpbuf[namelen++] = ':';
783 tmpgv = gv_fetchpvn_flags(tmpbuf, namelen, flags, SVt_PVHV);
784 if (tmpbuf != smallbuf)
789 GvHV(tmpgv) = newHV();
791 if (!HvNAME_get(stash))
792 hv_name_set(stash, name, namelen, 0);
797 =for apidoc gv_stashsv
799 Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
805 Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
808 const char * const ptr = SvPV_const(sv,len);
809 return gv_stashpvn(ptr, len, flags);
814 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
815 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
819 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
821 const char * const nambeg = SvPV_const(name, len);
822 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
826 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
830 register const char *name = nambeg;
831 register GV *gv = NULL;
834 register const char *name_cursor;
836 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
837 const I32 no_expand = flags & GV_NOEXPAND;
838 const I32 add = flags & ~GV_NOADD_MASK;
839 const char *const name_end = nambeg + full_len;
840 const char *const name_em1 = name_end - 1;
842 if (flags & GV_NOTQUAL) {
843 /* Caller promised that there is no stash, so we can skip the check. */
848 if (full_len > 2 && *name == '*' && isALPHA(name[1])) {
849 /* accidental stringify on a GV? */
853 for (name_cursor = name; name_cursor < name_end; name_cursor++) {
854 if ((*name_cursor == ':' && name_cursor < name_em1
855 && name_cursor[1] == ':')
856 || (*name_cursor == '\'' && name_cursor[1]))
860 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
863 len = name_cursor - name;
868 if (len + 2 <= (I32)sizeof (smallbuf))
871 Newx(tmpbuf, len+2, char);
872 Copy(name, tmpbuf, len, char);
875 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
876 gv = gvp ? *gvp : NULL;
877 if (gv && gv != (GV*)&PL_sv_undef) {
878 if (SvTYPE(gv) != SVt_PVGV)
879 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
883 if (tmpbuf != smallbuf)
885 if (!gv || gv == (GV*)&PL_sv_undef)
888 if (!(stash = GvHV(gv)))
889 stash = GvHV(gv) = newHV();
891 if (!HvNAME_get(stash))
892 hv_name_set(stash, nambeg, name_cursor - nambeg, 0);
895 if (*name_cursor == ':')
899 if (name == name_end)
900 return gv ? gv : (GV*)*hv_fetchs(PL_defstash, "main::", TRUE);
903 len = name_cursor - name;
905 /* No stash in name, so see how we can default */
909 if (len && isIDFIRST_lazy(name)) {
918 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
919 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
920 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
924 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
929 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
930 && name[3] == 'I' && name[4] == 'N')
934 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
935 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
936 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
940 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
941 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
949 else if (IN_PERL_COMPILETIME) {
951 if (add && (PL_hints & HINT_STRICT_VARS) &&
952 sv_type != SVt_PVCV &&
953 sv_type != SVt_PVGV &&
954 sv_type != SVt_PVFM &&
955 sv_type != SVt_PVIO &&
956 !(len == 1 && sv_type == SVt_PV &&
957 (*name == 'a' || *name == 'b')) )
959 gvp = (GV**)hv_fetch(stash,name,len,0);
961 *gvp == (GV*)&PL_sv_undef ||
962 SvTYPE(*gvp) != SVt_PVGV)
966 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
967 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
968 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
970 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
971 sv_type == SVt_PVAV ? '@' :
972 sv_type == SVt_PVHV ? '%' : '$',
975 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
981 stash = CopSTASH(PL_curcop);
987 /* By this point we should have a stash and a name */
991 SV * const err = Perl_mess(aTHX_
992 "Global symbol \"%s%s\" requires explicit package name",
993 (sv_type == SVt_PV ? "$"
994 : sv_type == SVt_PVAV ? "@"
995 : sv_type == SVt_PVHV ? "%"
998 if (USE_UTF8_IN_NAMES)
1001 gv = gv_fetchpvn_flags("<none>::", 8, GV_ADDMULTI, SVt_PVHV);
1003 /* symbol table under destruction */
1012 if (!SvREFCNT(stash)) /* symbol table under destruction */
1015 gvp = (GV**)hv_fetch(stash,name,len,add);
1016 if (!gvp || *gvp == (GV*)&PL_sv_undef)
1019 if (SvTYPE(gv) == SVt_PVGV) {
1022 gv_init_sv(gv, sv_type);
1023 if (len == 1 && (sv_type == SVt_PVHV || sv_type == SVt_PVGV)) {
1025 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1026 else if (*name == '-' || *name == '+')
1027 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "FETCH", 0);
1031 } else if (no_init) {
1033 } else if (no_expand && SvROK(gv)) {
1037 /* Adding a new symbol */
1039 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
1040 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
1041 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
1042 gv_init_sv(gv, sv_type);
1044 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
1045 : (PL_dowarn & G_WARN_ON ) ) )
1048 /* set up magic where warranted */
1053 /* Nothing else to do.
1054 The compiler will probably turn the switch statement into a
1055 branch table. Make sure we avoid even that small overhead for
1056 the common case of lower case variable names. */
1060 const char * const name2 = name + 1;
1063 if (strEQ(name2, "RGV")) {
1064 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1066 else if (strEQ(name2, "RGVOUT")) {
1071 if (strnEQ(name2, "XPORT", 5))
1075 if (strEQ(name2, "SA")) {
1076 AV* const av = GvAVn(gv);
1078 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, NULL, 0);
1079 /* NOTE: No support for tied ISA */
1080 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
1081 && AvFILLp(av) == -1)
1084 av_push(av, newSVpvn(pname = "NDBM_File",9));
1085 gv_stashpvn(pname, 9, GV_ADD);
1086 av_push(av, newSVpvn(pname = "DB_File",7));
1087 gv_stashpvn(pname, 7, GV_ADD);
1088 av_push(av, newSVpvn(pname = "GDBM_File",9));
1089 gv_stashpvn(pname, 9, GV_ADD);
1090 av_push(av, newSVpvn(pname = "SDBM_File",9));
1091 gv_stashpvn(pname, 9, GV_ADD);
1092 av_push(av, newSVpvn(pname = "ODBM_File",9));
1093 gv_stashpvn(pname, 9, GV_ADD);
1098 if (strEQ(name2, "VERLOAD")) {
1099 HV* const hv = GvHVn(gv);
1101 hv_magic(hv, NULL, PERL_MAGIC_overload);
1105 if (strEQ(name2, "IG")) {
1109 Newxz(PL_psig_ptr, SIG_SIZE, SV*);
1110 Newxz(PL_psig_name, SIG_SIZE, SV*);
1111 Newxz(PL_psig_pend, SIG_SIZE, int);
1115 hv_magic(hv, NULL, PERL_MAGIC_sig);
1116 for (i = 1; i < SIG_SIZE; i++) {
1117 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1119 sv_setsv(*init, &PL_sv_undef);
1121 PL_psig_name[i] = 0;
1122 PL_psig_pend[i] = 0;
1127 if (strEQ(name2, "ERSION"))
1130 case '\003': /* $^CHILD_ERROR_NATIVE */
1131 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1134 case '\005': /* $^ENCODING */
1135 if (strEQ(name2, "NCODING"))
1138 case '\015': /* $^MATCH */
1139 if (strEQ(name2, "ATCH"))
1141 case '\017': /* $^OPEN */
1142 if (strEQ(name2, "PEN"))
1145 case '\020': /* $^PREMATCH $^POSTMATCH */
1146 if (strEQ(name2, "REMATCH") || strEQ(name2, "OSTMATCH"))
1148 case '\024': /* ${^TAINT} */
1149 if (strEQ(name2, "AINT"))
1152 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1153 if (strEQ(name2, "NICODE"))
1155 if (strEQ(name2, "TF8LOCALE"))
1157 if (strEQ(name2, "TF8CACHE"))
1160 case '\027': /* $^WARNING_BITS */
1161 if (strEQ(name2, "ARNING_BITS"))
1174 /* ensures variable is only digits */
1175 /* ${"1foo"} fails this test (and is thus writeable) */
1176 /* added by japhy, but borrowed from is_gv_magical */
1177 const char *end = name + len;
1178 while (--end > name) {
1179 if (!isDIGIT(*end)) return gv;
1186 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1187 be case '\0' in this switch statement (ie a default case) */
1193 sv_type == SVt_PVAV ||
1194 sv_type == SVt_PVHV ||
1195 sv_type == SVt_PVCV ||
1196 sv_type == SVt_PVFM ||
1199 PL_sawampersand = TRUE;
1203 sv_setpv(GvSVn(gv),PL_chopset);
1207 #ifdef COMPLEX_STATUS
1208 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1214 /* If %! has been used, automatically load Errno.pm. */
1216 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1218 /* magicalization must be done before require_tie_mod is called */
1219 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1220 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1225 GvMULTI_on(gv); /* no used once warnings here */
1227 AV* const av = GvAVn(gv);
1228 SV* const avc = (*name == '+') ? (SV*)av : NULL;
1230 sv_magic((SV*)av, avc, PERL_MAGIC_regdata, NULL, 0);
1231 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1233 SvREADONLY_on(GvSVn(gv));
1236 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1237 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "FETCH", 0);
1243 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1244 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1245 "$%c is no longer supported", *name);
1248 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1251 case '\010': /* $^H */
1253 HV *const hv = GvHVn(gv);
1254 hv_magic(hv, NULL, PERL_MAGIC_hints);
1257 case '\023': /* $^S */
1268 SvREADONLY_on(GvSVn(gv));
1283 case '\001': /* $^A */
1284 case '\003': /* $^C */
1285 case '\004': /* $^D */
1286 case '\005': /* $^E */
1287 case '\006': /* $^F */
1288 case '\011': /* $^I, NOT \t in EBCDIC */
1289 case '\016': /* $^N */
1290 case '\017': /* $^O */
1291 case '\020': /* $^P */
1292 case '\024': /* $^T */
1293 case '\027': /* $^W */
1295 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1298 case '\014': /* $^L */
1299 sv_setpvn(GvSVn(gv),"\f",1);
1300 PL_formfeed = GvSVn(gv);
1303 sv_setpvn(GvSVn(gv),"\034",1);
1307 SV * const sv = GvSVn(gv);
1308 if (!sv_derived_from(PL_patchlevel, "version"))
1309 upg_version(PL_patchlevel, TRUE);
1310 GvSV(gv) = vnumify(PL_patchlevel);
1311 SvREADONLY_on(GvSV(gv));
1315 case '\026': /* $^V */
1317 SV * const sv = GvSVn(gv);
1318 GvSV(gv) = new_version(PL_patchlevel);
1319 SvREADONLY_on(GvSV(gv));
1329 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1333 const HV * const hv = GvSTASH(gv);
1338 sv_setpv(sv, prefix ? prefix : "");
1340 name = HvNAME_get(hv);
1342 namelen = HvNAMELEN_get(hv);
1348 if (keepmain || strNE(name, "main")) {
1349 sv_catpvn(sv,name,namelen);
1352 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1356 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1358 const GV * const egv = GvEGV(gv);
1359 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1367 IO * const io = (IO*)newSV_type(SVt_PVIO);
1368 /* This used to read SvREFCNT(io) = 1;
1369 It's not clear why the reference count needed an explicit reset. NWC
1371 assert (SvREFCNT(io) == 1);
1373 /* Clear the stashcache because a new IO could overrule a package name */
1374 hv_clear(PL_stashcache);
1375 iogv = gv_fetchpvs("FileHandle::", 0, SVt_PVHV);
1376 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1377 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1378 iogv = gv_fetchpvs("IO::Handle::", GV_ADD, SVt_PVHV);
1379 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1384 Perl_gv_check(pTHX_ const HV *stash)
1389 if (!HvARRAY(stash))
1391 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1393 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1396 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1397 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1399 if (hv != PL_defstash && hv != stash)
1400 gv_check(hv); /* nested package */
1402 else if (isALPHA(*HeKEY(entry))) {
1404 gv = (GV*)HeVAL(entry);
1405 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
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 /* If the GP they asked for a reference to contains
1442 a method cache entry, clear it first, so that we
1443 don't infect them with our cached entry */
1444 SvREFCNT_dec(gp->gp_cv);
1448 /* XXX if anyone finds a method cache regression with
1449 the "mro" stuff, turning this else block back on
1450 is probably the first place to look --blblack
1454 PL_sub_generation++;
1462 Perl_gp_free(pTHX_ GV *gv)
1467 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
1469 if (gp->gp_refcnt == 0) {
1470 if (ckWARN_d(WARN_INTERNAL))
1471 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1472 "Attempt to free unreferenced glob pointers"
1473 pTHX__FORMAT pTHX__VALUE);
1477 /* Deleting the name of a subroutine invalidates method cache */
1478 PL_sub_generation++;
1480 if (--gp->gp_refcnt > 0) {
1481 if (gp->gp_egv == gv)
1487 if (gp->gp_file_hek)
1488 unshare_hek(gp->gp_file_hek);
1489 SvREFCNT_dec(gp->gp_sv);
1490 SvREFCNT_dec(gp->gp_av);
1491 /* FIXME - another reference loop GV -> symtab -> GV ?
1492 Somehow gp->gp_hv can end up pointing at freed garbage. */
1493 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1494 const char *hvname = HvNAME_get(gp->gp_hv);
1495 if (PL_stashcache && hvname)
1496 hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv),
1498 SvREFCNT_dec(gp->gp_hv);
1500 SvREFCNT_dec(gp->gp_io);
1501 SvREFCNT_dec(gp->gp_cv);
1502 SvREFCNT_dec(gp->gp_form);
1509 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1511 AMT * const amtp = (AMT*)mg->mg_ptr;
1512 PERL_UNUSED_ARG(sv);
1514 if (amtp && AMT_AMAGIC(amtp)) {
1516 for (i = 1; i < NofAMmeth; i++) {
1517 CV * const cv = amtp->table[i];
1519 SvREFCNT_dec((SV *) cv);
1520 amtp->table[i] = NULL;
1527 /* Updates and caches the CV's */
1530 Perl_Gv_AMupdate(pTHX_ HV *stash)
1533 MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1537 newgen = PL_sub_generation + HvMROMETA(stash)->sub_generation;
1539 const AMT * const amtp = (AMT*)mg->mg_ptr;
1540 if (amtp->was_ok_am == PL_amagic_generation
1541 && amtp->was_ok_sub == newgen) {
1542 return (bool)AMT_OVERLOADED(amtp);
1544 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1547 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1550 amt.was_ok_am = PL_amagic_generation;
1551 amt.was_ok_sub = newgen;
1552 amt.fallback = AMGfallNO;
1556 int filled = 0, have_ovl = 0;
1559 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1561 /* Try to find via inheritance. */
1562 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1563 SV * const sv = gv ? GvSV(gv) : NULL;
1567 lim = DESTROY_amg; /* Skip overloading entries. */
1568 #ifdef PERL_DONT_CREATE_GVSV
1570 NOOP; /* Equivalent to !SvTRUE and !SvOK */
1573 else if (SvTRUE(sv))
1574 amt.fallback=AMGfallYES;
1576 amt.fallback=AMGfallNEVER;
1578 for (i = 1; i < lim; i++)
1579 amt.table[i] = NULL;
1580 for (; i < NofAMmeth; i++) {
1581 const char * const cooky = PL_AMG_names[i];
1582 /* Human-readable form, for debugging: */
1583 const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1584 const STRLEN l = strlen(cooky);
1586 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1587 cp, HvNAME_get(stash)) );
1588 /* don't fill the cache while looking up!
1589 Creation of inheritance stubs in intermediate packages may
1590 conflict with the logic of runtime method substitution.
1591 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1592 then we could have created stubs for "(+0" in A and C too.
1593 But if B overloads "bool", we may want to use it for
1594 numifying instead of C's "+0". */
1595 if (i >= DESTROY_amg)
1596 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1597 else /* Autoload taken care of below */
1598 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1600 if (gv && (cv = GvCV(gv))) {
1602 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1603 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1604 /* This is a hack to support autoloading..., while
1605 knowing *which* methods were declared as overloaded. */
1606 /* GvSV contains the name of the method. */
1608 SV *gvsv = GvSV(gv);
1610 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1611 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1612 (void*)GvSV(gv), cp, hvname) );
1613 if (!gvsv || !SvPOK(gvsv)
1614 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1617 /* Can be an import stub (created by "can"). */
1618 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1619 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1620 "in package \"%.256s\"",
1621 (GvCVGEN(gv) ? "Stub found while resolving"
1625 cv = GvCV(gv = ngv);
1627 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1628 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1629 GvNAME(CvGV(cv))) );
1631 if (i < DESTROY_amg)
1633 } else if (gv) { /* Autoloaded... */
1637 amt.table[i]=(CV*)SvREFCNT_inc_simple(cv);
1640 AMT_AMAGIC_on(&amt);
1642 AMT_OVERLOADED_on(&amt);
1643 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1644 (char*)&amt, sizeof(AMT));
1648 /* Here we have no table: */
1650 AMT_AMAGIC_off(&amt);
1651 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1652 (char*)&amt, sizeof(AMTS));
1658 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1665 if (!stash || !HvNAME_get(stash))
1668 newgen = PL_sub_generation + HvMROMETA(stash)->sub_generation;
1670 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1674 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1677 amtp = (AMT*)mg->mg_ptr;
1678 if ( amtp->was_ok_am != PL_amagic_generation
1679 || amtp->was_ok_sub != newgen )
1681 if (AMT_AMAGIC(amtp)) {
1682 CV * const ret = amtp->table[id];
1683 if (ret && isGV(ret)) { /* Autoloading stab */
1684 /* Passing it through may have resulted in a warning
1685 "Inherited AUTOLOAD for a non-method deprecated", since
1686 our caller is going through a function call, not a method call.
1687 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1688 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1701 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1706 CV **cvp=NULL, **ocvp=NULL;
1707 AMT *amtp=NULL, *oamtp=NULL;
1708 int off = 0, off1, lr = 0, notfound = 0;
1709 int postpr = 0, force_cpy = 0;
1710 int assign = AMGf_assign & flags;
1711 const int assignshift = assign ? 1 : 0;
1716 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1717 && (stash = SvSTASH(SvRV(left)))
1718 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1719 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1720 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1722 && ((cv = cvp[off=method+assignshift])
1723 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1729 cv = cvp[off=method])))) {
1730 lr = -1; /* Call method for left argument */
1732 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1735 /* look for substituted methods */
1736 /* In all the covered cases we should be called with assign==0. */
1740 if ((cv = cvp[off=add_ass_amg])
1741 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1742 right = &PL_sv_yes; lr = -1; assign = 1;
1747 if ((cv = cvp[off = subtr_ass_amg])
1748 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1749 right = &PL_sv_yes; lr = -1; assign = 1;
1753 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1756 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1759 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1762 (void)((cv = cvp[off=bool__amg])
1763 || (cv = cvp[off=numer_amg])
1764 || (cv = cvp[off=string_amg]));
1770 * SV* ref causes confusion with the interpreter variable of
1773 SV* const tmpRef=SvRV(left);
1774 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1776 * Just to be extra cautious. Maybe in some
1777 * additional cases sv_setsv is safe, too.
1779 SV* const newref = newSVsv(tmpRef);
1780 SvOBJECT_on(newref);
1781 /* As a bit of a source compatibility hack, SvAMAGIC() and
1782 friends dereference an RV, to behave the same was as when
1783 overloading was stored on the reference, not the referant.
1784 Hence we can't use SvAMAGIC_on()
1786 SvFLAGS(newref) |= SVf_AMAGIC;
1787 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1793 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1794 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1795 SV* const nullsv=sv_2mortal(newSViv(0));
1797 SV* const lessp = amagic_call(left,nullsv,
1798 lt_amg,AMGf_noright);
1799 logic = SvTRUE(lessp);
1801 SV* const lessp = amagic_call(left,nullsv,
1802 ncmp_amg,AMGf_noright);
1803 logic = (SvNV(lessp) < 0);
1806 if (off==subtr_amg) {
1817 if ((cv = cvp[off=subtr_amg])) {
1819 left = sv_2mortal(newSViv(0));
1824 case iter_amg: /* XXXX Eventually should do to_gv. */
1826 return NULL; /* Delegate operation to standard mechanisms. */
1834 return left; /* Delegate operation to standard mechanisms. */
1839 if (!cv) goto not_found;
1840 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1841 && (stash = SvSTASH(SvRV(right)))
1842 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1843 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1844 ? (amtp = (AMT*)mg->mg_ptr)->table
1846 && (cv = cvp[off=method])) { /* Method for right
1849 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1850 && (cvp=ocvp) && (lr = -1))
1851 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1852 && !(flags & AMGf_unary)) {
1853 /* We look for substitution for
1854 * comparison operations and
1856 if (method==concat_amg || method==concat_ass_amg
1857 || method==repeat_amg || method==repeat_ass_amg) {
1858 return NULL; /* Delegate operation to string conversion */
1868 postpr = 1; off=ncmp_amg; break;
1875 postpr = 1; off=scmp_amg; break;
1877 if (off != -1) cv = cvp[off];
1882 not_found: /* No method found, either report or croak */
1903 return left; /* Delegate operation to standard mechanisms. */
1906 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1907 notfound = 1; lr = -1;
1908 } else if (cvp && (cv=cvp[nomethod_amg])) {
1909 notfound = 1; lr = 1;
1910 } else if ((amtp && amtp->fallback >= AMGfallYES) && !DEBUG_o_TEST) {
1911 /* Skip generating the "no method found" message. */
1915 if (off==-1) off=method;
1916 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1917 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1918 AMG_id2name(method + assignshift),
1919 (flags & AMGf_unary ? " " : "\n\tleft "),
1921 "in overloaded package ":
1922 "has no overloaded magic",
1924 HvNAME_get(SvSTASH(SvRV(left))):
1927 ",\n\tright argument in overloaded package ":
1930 : ",\n\tright argument has no overloaded magic"),
1932 HvNAME_get(SvSTASH(SvRV(right))):
1934 if (amtp && amtp->fallback >= AMGfallYES) {
1935 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1937 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
1941 force_cpy = force_cpy || assign;
1946 DEBUG_o(Perl_deb(aTHX_
1947 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1949 method+assignshift==off? "" :
1951 method+assignshift==off? "" :
1952 AMG_id2name(method+assignshift),
1953 method+assignshift==off? "" : "\")",
1954 flags & AMGf_unary? "" :
1955 lr==1 ? " for right argument": " for left argument",
1956 flags & AMGf_unary? " for argument" : "",
1957 stash ? HvNAME_get(stash) : "null",
1958 fl? ",\n\tassignment variant used": "") );
1961 /* Since we use shallow copy during assignment, we need
1962 * to dublicate the contents, probably calling user-supplied
1963 * version of copy operator
1965 /* We need to copy in following cases:
1966 * a) Assignment form was called.
1967 * assignshift==1, assign==T, method + 1 == off
1968 * b) Increment or decrement, called directly.
1969 * assignshift==0, assign==0, method + 0 == off
1970 * c) Increment or decrement, translated to assignment add/subtr.
1971 * assignshift==0, assign==T,
1973 * d) Increment or decrement, translated to nomethod.
1974 * assignshift==0, assign==0,
1976 * e) Assignment form translated to nomethod.
1977 * assignshift==1, assign==T, method + 1 != off
1980 /* off is method, method+assignshift, or a result of opcode substitution.
1981 * In the latter case assignshift==0, so only notfound case is important.
1983 if (( (method + assignshift == off)
1984 && (assign || (method == inc_amg) || (method == dec_amg)))
1991 const bool oldcatch = CATCH_GET;
1994 Zero(&myop, 1, BINOP);
1995 myop.op_last = (OP *) &myop;
1996 myop.op_next = NULL;
1997 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1999 PUSHSTACKi(PERLSI_OVERLOAD);
2002 PL_op = (OP *) &myop;
2003 if (PERLDB_SUB && PL_curstash != PL_debstash)
2004 PL_op->op_private |= OPpENTERSUB_DB;
2008 EXTEND(SP, notfound + 5);
2009 PUSHs(lr>0? right: left);
2010 PUSHs(lr>0? left: right);
2011 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
2013 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
2018 if ((PL_op = Perl_pp_entersub(aTHX)))
2026 CATCH_SET(oldcatch);
2033 ans=SvIV(res)<=0; break;
2036 ans=SvIV(res)<0; break;
2039 ans=SvIV(res)>=0; break;
2042 ans=SvIV(res)>0; break;
2045 ans=SvIV(res)==0; break;
2048 ans=SvIV(res)!=0; break;
2051 SvSetSV(left,res); return left;
2053 ans=!SvTRUE(res); break;
2058 } else if (method==copy_amg) {
2060 Perl_croak(aTHX_ "Copy method did not return a reference");
2062 return SvREFCNT_inc(SvRV(res));
2070 =for apidoc is_gv_magical_sv
2072 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
2078 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
2081 const char * const temp = SvPV_const(name, len);
2082 return is_gv_magical(temp, len, flags);
2086 =for apidoc is_gv_magical
2088 Returns C<TRUE> if given the name of a magical GV.
2090 Currently only useful internally when determining if a GV should be
2091 created even in rvalue contexts.
2093 C<flags> is not used at present but available for future extension to
2094 allow selecting particular classes of magical variable.
2096 Currently assumes that C<name> is NUL terminated (as well as len being valid).
2097 This assumption is met by all callers within the perl core, which all pass
2098 pointers returned by SvPV.
2103 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
2105 PERL_UNUSED_CONTEXT;
2106 PERL_UNUSED_ARG(flags);
2109 const char * const name1 = name + 1;
2112 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
2116 if (len == 8 && strEQ(name1, "VERLOAD"))
2120 if (len == 3 && name[1] == 'I' && name[2] == 'G')
2123 /* Using ${^...} variables is likely to be sufficiently rare that
2124 it seems sensible to avoid the space hit of also checking the
2126 case '\017': /* ${^OPEN} */
2127 if (strEQ(name1, "PEN"))
2130 case '\024': /* ${^TAINT} */
2131 if (strEQ(name1, "AINT"))
2134 case '\025': /* ${^UNICODE} */
2135 if (strEQ(name1, "NICODE"))
2137 if (strEQ(name1, "TF8LOCALE"))
2140 case '\027': /* ${^WARNING_BITS} */
2141 if (strEQ(name1, "ARNING_BITS"))
2154 const char *end = name + len;
2155 while (--end > name) {
2163 /* Because we're already assuming that name is NUL terminated
2164 below, we can treat an empty name as "\0" */
2191 case '\001': /* $^A */
2192 case '\003': /* $^C */
2193 case '\004': /* $^D */
2194 case '\005': /* $^E */
2195 case '\006': /* $^F */
2196 case '\010': /* $^H */
2197 case '\011': /* $^I, NOT \t in EBCDIC */
2198 case '\014': /* $^L */
2199 case '\016': /* $^N */
2200 case '\017': /* $^O */
2201 case '\020': /* $^P */
2202 case '\023': /* $^S */
2203 case '\024': /* $^T */
2204 case '\026': /* $^V */
2205 case '\027': /* $^W */
2225 Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
2231 PERL_UNUSED_ARG(flags);
2234 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
2236 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
2237 unshare_hek(GvNAME_HEK(gv));
2240 PERL_HASH(hash, name, len);
2241 GvNAME_HEK(gv) = share_hek(name, len, hash);
2246 * c-indentation-style: bsd
2248 * indent-tabs-mode: t
2251 * ex: set ts=8 sts=4 sw=4 noet: