3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 * 2000, 2001, 2002, 2003, 2004, 2005, 2006, 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 = CopFILE(PL_curcop) ? CopFILE(PL_curcop) : "";
165 STRLEN len = strlen(file);
168 PERL_HASH(hash, file, len);
172 #ifndef PERL_DONT_CREATE_GVSV
173 gp->gv_sv = newSV(0);
176 gp->gp_line = CopLINE(PL_curcop);
177 /* XXX Ideally this cast would be replaced with a change to const char*
179 gp->gp_file_hek = share_hek(file, len, hash);
187 Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
190 const U32 old_type = SvTYPE(gv);
191 const bool doproto = old_type > SVt_NULL;
192 const char * const proto = (doproto && SvPOK(gv)) ? SvPVX_const(gv) : NULL;
193 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
194 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
196 assert (!(proto && has_constant));
199 /* The constant has to be a simple scalar type. */
200 switch (SvTYPE(has_constant)) {
206 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
207 sv_reftype(has_constant, 0));
215 if (old_type < SVt_PVGV) {
216 if (old_type >= SVt_PV)
218 sv_upgrade((SV*)gv, SVt_PVGV);
226 Safefree(SvPVX_mutable(gv));
231 GvGP(gv) = Perl_newGP(aTHX_ gv);
234 Perl_sv_add_backref(aTHX_ (SV*)stash, (SV*)gv);
235 gv_name_set(gv, name, len, GV_ADD);
236 if (multi || doproto) /* doproto means it _was_ mentioned */
238 if (doproto) { /* Replicate part of newSUB here. */
241 /* newCONSTSUB takes ownership of the reference from us. */
242 GvCV(gv) = newCONSTSUB(stash, name, has_constant);
243 /* If this reference was a copy of another, then the subroutine
244 must have been "imported", by a Perl space assignment to a GV
245 from a reference to CV. */
246 if (exported_constant)
247 GvIMPORTED_CV_on(gv);
249 /* XXX unsafe for threads if eval_owner isn't held */
250 (void) start_subparse(0,0); /* Create empty CV in compcv. */
251 GvCV(gv) = PL_compcv;
257 CvFILE_set_from_cop(GvCV(gv), PL_curcop);
258 CvSTASH(GvCV(gv)) = PL_curstash;
260 sv_setpv((SV*)GvCV(gv), proto);
267 S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
279 #ifdef PERL_DONT_CREATE_GVSV
292 =for apidoc gv_fetchmeth
294 Returns the glob with the given C<name> and a defined subroutine or
295 C<NULL>. The glob lives in the given C<stash>, or in the stashes
296 accessible via @ISA and UNIVERSAL::.
298 The argument C<level> should be either 0 or -1. If C<level==0>, as a
299 side-effect creates a glob with the given C<name> in the given C<stash>
300 which in the case of success contains an alias for the subroutine, and sets
301 up caching info for this glob. Similarly for all the searched stashes.
303 This function grants C<"SUPER"> token as a postfix of the stash name. The
304 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
305 visible to Perl code. So when calling C<call_sv>, you should not use
306 the GV directly; instead, you should use the method's CV, which can be
307 obtained from the GV with the C<GvCV> macro.
313 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
322 HV* lastchance = NULL;
324 /* UNIVERSAL methods should be callable without a stash */
326 level = -1; /* probably appropriate */
327 if(!(stash = gv_stashpvs("UNIVERSAL", FALSE)))
331 hvname = HvNAME_get(stash);
334 "Can't use anonymous symbol table for method lookup");
336 if ((level > 100) || (level < -100))
337 Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
340 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
342 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
347 if (SvTYPE(topgv) != SVt_PVGV)
348 gv_init(topgv, stash, name, len, TRUE);
349 if ((cv = GvCV(topgv))) {
350 /* If genuine method or valid cache entry, use it */
351 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
353 /* Stale cached entry: junk it */
355 GvCV(topgv) = cv = NULL;
358 else if (GvCVGEN(topgv) == PL_sub_generation)
359 return 0; /* cache indicates sub doesn't exist */
362 gvp = (GV**)hv_fetchs(stash, "ISA", FALSE);
363 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : NULL;
365 /* create and re-create @.*::SUPER::ISA on demand */
366 if (!av || !SvMAGIC(av)) {
367 STRLEN packlen = HvNAMELEN_get(stash);
369 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
373 basestash = gv_stashpvn(hvname, packlen, TRUE);
374 gvp = (GV**)hv_fetchs(basestash, "ISA", FALSE);
375 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
376 gvp = (GV**)hv_fetchs(stash, "ISA", TRUE);
377 if (!gvp || !(gv = *gvp))
378 Perl_croak(aTHX_ "Cannot create %s::ISA", hvname);
379 if (SvTYPE(gv) != SVt_PVGV)
380 gv_init(gv, stash, "ISA", 3, TRUE);
381 SvREFCNT_dec(GvAV(gv));
382 GvAV(gv) = (AV*)SvREFCNT_inc_simple(av);
388 SV** svp = AvARRAY(av);
389 /* NOTE: No support for tied ISA */
390 I32 items = AvFILLp(av) + 1;
392 SV* const sv = *svp++;
393 HV* const basestash = gv_stashsv(sv, FALSE);
395 if (ckWARN(WARN_MISC))
396 Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
400 gv = gv_fetchmeth(basestash, name, len,
401 (level >= 0) ? level + 1 : level - 1);
407 /* if at top level, try UNIVERSAL */
409 if (level == 0 || level == -1) {
410 lastchance = gv_stashpvs("UNIVERSAL", FALSE);
413 if ((gv = gv_fetchmeth(lastchance, name, len,
414 (level >= 0) ? level + 1 : level - 1)))
418 * Cache method in topgv if:
419 * 1. topgv has no synonyms (else inheritance crosses wires)
420 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
423 GvREFCNT(topgv) == 1 &&
425 (CvROOT(cv) || CvXSUB(cv)))
427 if ((cv = GvCV(topgv)))
429 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
430 GvCVGEN(topgv) = PL_sub_generation;
434 else if (topgv && GvREFCNT(topgv) == 1) {
435 /* cache the fact that the method is not defined */
436 GvCVGEN(topgv) = PL_sub_generation;
445 =for apidoc gv_fetchmeth_autoload
447 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
448 Returns a glob for the subroutine.
450 For an autoloaded subroutine without a GV, will create a GV even
451 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
452 of the result may be zero.
458 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
460 GV *gv = gv_fetchmeth(stash, name, len, level);
467 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
468 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
470 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
473 if (!(CvROOT(cv) || CvXSUB(cv)))
475 /* Have an autoload */
476 if (level < 0) /* Cannot do without a stub */
477 gv_fetchmeth(stash, name, len, 0);
478 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
487 =for apidoc gv_fetchmethod_autoload
489 Returns the glob which contains the subroutine to call to invoke the method
490 on the C<stash>. In fact in the presence of autoloading this may be the
491 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
494 The third parameter of C<gv_fetchmethod_autoload> determines whether
495 AUTOLOAD lookup is performed if the given method is not present: non-zero
496 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
497 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
498 with a non-zero C<autoload> parameter.
500 These functions grant C<"SUPER"> token as a prefix of the method name. Note
501 that if you want to keep the returned glob for a long time, you need to
502 check for it being "AUTOLOAD", since at the later time the call may load a
503 different subroutine due to $AUTOLOAD changing its value. Use the glob
504 created via a side effect to do this.
506 These functions have the same side-effects and as C<gv_fetchmeth> with
507 C<level==0>. C<name> should be writable if contains C<':'> or C<'
508 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
509 C<call_sv> apply equally to these functions.
515 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
518 register const char *nend;
519 const char *nsplit = NULL;
523 if (stash && SvTYPE(stash) < SVt_PVHV)
526 for (nend = name; *nend; nend++) {
529 else if (*nend == ':' && *(nend + 1) == ':')
533 const char * const origname = name;
537 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
538 /* ->SUPER::method should really be looked up in original stash */
539 SV * const tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
540 CopSTASHPV(PL_curcop)));
541 /* __PACKAGE__::SUPER stash should be autovivified */
542 stash = gv_stashpvn(SvPVX_const(tmpstr), SvCUR(tmpstr), TRUE);
543 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
544 origname, HvNAME_get(stash), name) );
547 /* don't autovifify if ->NoSuchStash::method */
548 stash = gv_stashpvn(origname, nsplit - origname, FALSE);
550 /* however, explicit calls to Pkg::SUPER::method may
551 happen, and may require autovivification to work */
552 if (!stash && (nsplit - origname) >= 7 &&
553 strnEQ(nsplit - 7, "::SUPER", 7) &&
554 gv_stashpvn(origname, nsplit - origname - 7, FALSE))
555 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
560 gv = gv_fetchmeth(stash, name, nend - name, 0);
562 if (strEQ(name,"import") || strEQ(name,"unimport"))
563 gv = (GV*)&PL_sv_yes;
565 gv = gv_autoload4(ostash, name, nend - name, TRUE);
568 CV* const cv = GvCV(gv);
569 if (!CvROOT(cv) && !CvXSUB(cv)) {
577 if (GvCV(stubgv) != cv) /* orphaned import */
580 autogv = gv_autoload4(GvSTASH(stubgv),
581 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
591 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
599 const char *packname = "";
600 STRLEN packname_len = 0;
602 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
605 if (SvTYPE(stash) < SVt_PVHV) {
606 packname = SvPV_const((SV*)stash, packname_len);
610 packname = HvNAME_get(stash);
611 packname_len = HvNAMELEN_get(stash);
614 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
618 if (!(CvROOT(cv) || CvXSUB(cv)))
622 * Inheriting AUTOLOAD for non-methods works ... for now.
624 if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
625 && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)
627 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
628 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
629 packname, (int)len, name);
632 /* rather than lookup/init $AUTOLOAD here
633 * only to have the XSUB do another lookup for $AUTOLOAD
634 * and split that value on the last '::',
635 * pass along the same data via some unused fields in the CV
638 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
644 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
645 * The subroutine's original name may not be "AUTOLOAD", so we don't
646 * use that, but for lack of anything better we will use the sub's
647 * original package to look up $AUTOLOAD.
649 varstash = GvSTASH(CvGV(cv));
650 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
654 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
655 #ifdef PERL_DONT_CREATE_GVSV
656 GvSV(vargv) = newSV(0);
660 varsv = GvSVn(vargv);
661 sv_setpvn(varsv, packname, packname_len);
662 sv_catpvs(varsv, "::");
663 sv_catpvn(varsv, name, len);
667 /* The "gv" parameter should be the glob known to Perl code as *!
668 * The scalar must already have been magicalized.
671 S_require_errno(pTHX_ GV *gv)
674 HV* stash = gv_stashpvs("Errno", FALSE);
676 if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
680 save_scalar(gv); /* keep the value of $! */
681 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
682 newSVpvs("Errno"), NULL);
685 stash = gv_stashpvs("Errno", FALSE);
686 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
687 Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available");
692 =for apidoc gv_stashpv
694 Returns a pointer to the stash for a specified package. C<name> should
695 be a valid UTF-8 string and must be null-terminated. If C<create> is set
696 then the package will be created if it does not already exist. If C<create>
697 is not set and the package does not exist then NULL is returned.
703 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
705 return gv_stashpvn(name, strlen(name), create);
709 =for apidoc gv_stashpvn
711 Returns a pointer to the stash for a specified package. C<name> should
712 be a valid UTF-8 string. The C<namelen> parameter indicates the length of
713 the C<name>, in bytes. If C<create> is set then the package will be
714 created if it does not already exist. If C<create> is not set and the
715 package does not exist then NULL is returned.
721 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
728 if (namelen + 3 < sizeof smallbuf)
731 Newx(tmpbuf, namelen + 3, char);
732 Copy(name,tmpbuf,namelen,char);
733 tmpbuf[namelen++] = ':';
734 tmpbuf[namelen++] = ':';
735 tmpbuf[namelen] = '\0';
736 tmpgv = gv_fetchpvn_flags(tmpbuf, namelen, create, SVt_PVHV);
737 if (tmpbuf != smallbuf)
742 GvHV(tmpgv) = newHV();
744 if (!HvNAME_get(stash))
745 hv_name_set(stash, name, namelen, 0);
750 =for apidoc gv_stashsv
752 Returns a pointer to the stash for a specified package, which must be a
753 valid UTF-8 string. See C<gv_stashpv>.
759 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
762 const char * const ptr = SvPV_const(sv,len);
763 return gv_stashpvn(ptr, len, create);
768 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
769 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
773 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
775 const char * const nambeg = SvPV_const(name, len);
776 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
780 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
784 register const char *name = nambeg;
785 register GV *gv = NULL;
788 register const char *name_cursor;
790 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
791 const I32 no_expand = flags & GV_NOEXPAND;
793 flags & ~SVf_UTF8 & ~GV_NOADD_NOINIT & ~GV_NOEXPAND & ~GV_NOTQUAL;
794 const char *const name_end = nambeg + full_len;
795 const char *const name_em1 = name_end - 1;
797 if (flags & GV_NOTQUAL) {
798 /* Caller promised that there is no stash, so we can skip the check. */
803 if (full_len > 2 && *name == '*' && isALPHA(name[1])) {
804 /* accidental stringify on a GV? */
808 for (name_cursor = name; name_cursor < name_end; name_cursor++) {
809 if ((*name_cursor == ':' && name_cursor < name_em1
810 && name_cursor[1] == ':')
811 || (*name_cursor == '\'' && name_cursor[1]))
815 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
818 len = name_cursor - name;
823 if (len + 3 < (I32)sizeof (smallbuf))
826 Newx(tmpbuf, len+3, char);
827 Copy(name, tmpbuf, len, char);
831 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
832 gv = gvp ? *gvp : NULL;
833 if (gv && gv != (GV*)&PL_sv_undef) {
834 if (SvTYPE(gv) != SVt_PVGV)
835 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
839 if (tmpbuf != smallbuf)
841 if (!gv || gv == (GV*)&PL_sv_undef)
844 if (!(stash = GvHV(gv)))
845 stash = GvHV(gv) = newHV();
847 if (!HvNAME_get(stash))
848 hv_name_set(stash, nambeg, name_cursor - nambeg, 0);
851 if (*name_cursor == ':')
855 if (name == name_end)
856 return gv ? gv : (GV*)*hv_fetchs(PL_defstash, "main::", TRUE);
859 len = name_cursor - name;
861 /* No stash in name, so see how we can default */
865 if (len && isIDFIRST_lazy(name)) {
874 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
875 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
876 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
880 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
885 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
886 && name[3] == 'I' && name[4] == 'N')
890 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
891 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
892 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
896 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
897 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
905 else if (IN_PERL_COMPILETIME) {
907 if (add && (PL_hints & HINT_STRICT_VARS) &&
908 sv_type != SVt_PVCV &&
909 sv_type != SVt_PVGV &&
910 sv_type != SVt_PVFM &&
911 sv_type != SVt_PVIO &&
912 !(len == 1 && sv_type == SVt_PV &&
913 (*name == 'a' || *name == 'b')) )
915 gvp = (GV**)hv_fetch(stash,name,len,0);
917 *gvp == (GV*)&PL_sv_undef ||
918 SvTYPE(*gvp) != SVt_PVGV)
922 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
923 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
924 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
926 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
927 sv_type == SVt_PVAV ? '@' :
928 sv_type == SVt_PVHV ? '%' : '$',
931 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
937 stash = CopSTASH(PL_curcop);
943 /* By this point we should have a stash and a name */
947 SV * const err = Perl_mess(aTHX_
948 "Global symbol \"%s%s\" requires explicit package name",
949 (sv_type == SVt_PV ? "$"
950 : sv_type == SVt_PVAV ? "@"
951 : sv_type == SVt_PVHV ? "%"
954 if (USE_UTF8_IN_NAMES)
957 gv = gv_fetchpvn_flags("<none>::", 8, GV_ADDMULTI, SVt_PVHV);
959 /* symbol table under destruction */
968 if (!SvREFCNT(stash)) /* symbol table under destruction */
971 gvp = (GV**)hv_fetch(stash,name,len,add);
972 if (!gvp || *gvp == (GV*)&PL_sv_undef)
975 if (SvTYPE(gv) == SVt_PVGV) {
978 gv_init_sv(gv, sv_type);
979 if (*name=='!' && sv_type == SVt_PVHV && len==1)
983 } else if (no_init) {
985 } else if (no_expand && SvROK(gv)) {
989 /* Adding a new symbol */
991 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
992 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
993 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
994 gv_init_sv(gv, sv_type);
996 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
997 : (PL_dowarn & G_WARN_ON ) ) )
1000 /* set up magic where warranted */
1005 /* Nothing else to do.
1006 The compiler will probably turn the switch statement into a
1007 branch table. Make sure we avoid even that small overhead for
1008 the common case of lower case variable names. */
1012 const char * const name2 = name + 1;
1015 if (strEQ(name2, "RGV")) {
1016 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1018 else if (strEQ(name2, "RGVOUT")) {
1023 if (strnEQ(name2, "XPORT", 5))
1027 if (strEQ(name2, "SA")) {
1028 AV* const av = GvAVn(gv);
1030 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, NULL, 0);
1031 /* NOTE: No support for tied ISA */
1032 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
1033 && AvFILLp(av) == -1)
1036 av_push(av, newSVpvn(pname = "NDBM_File",9));
1037 gv_stashpvn(pname, 9, TRUE);
1038 av_push(av, newSVpvn(pname = "DB_File",7));
1039 gv_stashpvn(pname, 7, TRUE);
1040 av_push(av, newSVpvn(pname = "GDBM_File",9));
1041 gv_stashpvn(pname, 9, TRUE);
1042 av_push(av, newSVpvn(pname = "SDBM_File",9));
1043 gv_stashpvn(pname, 9, TRUE);
1044 av_push(av, newSVpvn(pname = "ODBM_File",9));
1045 gv_stashpvn(pname, 9, TRUE);
1050 if (strEQ(name2, "VERLOAD")) {
1051 HV* const hv = GvHVn(gv);
1053 hv_magic(hv, NULL, PERL_MAGIC_overload);
1057 if (strEQ(name2, "IG")) {
1061 Newxz(PL_psig_ptr, SIG_SIZE, SV*);
1062 Newxz(PL_psig_name, SIG_SIZE, SV*);
1063 Newxz(PL_psig_pend, SIG_SIZE, int);
1067 hv_magic(hv, NULL, PERL_MAGIC_sig);
1068 for (i = 1; i < SIG_SIZE; i++) {
1069 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1071 sv_setsv(*init, &PL_sv_undef);
1073 PL_psig_name[i] = 0;
1074 PL_psig_pend[i] = 0;
1079 if (strEQ(name2, "ERSION"))
1082 case '\003': /* $^CHILD_ERROR_NATIVE */
1083 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1086 case '\005': /* $^ENCODING */
1087 if (strEQ(name2, "NCODING"))
1090 case '\017': /* $^OPEN */
1091 if (strEQ(name2, "PEN"))
1094 case '\024': /* ${^TAINT} */
1095 if (strEQ(name2, "AINT"))
1098 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1099 if (strEQ(name2, "NICODE"))
1101 if (strEQ(name2, "TF8LOCALE"))
1103 if (strEQ(name2, "TF8CACHE"))
1106 case '\027': /* $^WARNING_BITS */
1107 if (strEQ(name2, "ARNING_BITS"))
1120 /* ensures variable is only digits */
1121 /* ${"1foo"} fails this test (and is thus writeable) */
1122 /* added by japhy, but borrowed from is_gv_magical */
1123 const char *end = name + len;
1124 while (--end > name) {
1125 if (!isDIGIT(*end)) return gv;
1132 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1133 be case '\0' in this switch statement (ie a default case) */
1139 sv_type == SVt_PVAV ||
1140 sv_type == SVt_PVHV ||
1141 sv_type == SVt_PVCV ||
1142 sv_type == SVt_PVFM ||
1145 PL_sawampersand = TRUE;
1149 sv_setpv(GvSVn(gv),PL_chopset);
1153 #ifdef COMPLEX_STATUS
1154 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1160 /* If %! has been used, automatically load Errno.pm.
1161 The require will itself set errno, so in order to
1162 preserve its value we have to set up the magic
1163 now (rather than going to magicalize)
1166 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1168 if (sv_type == SVt_PVHV)
1174 AV* const av = GvAVn(gv);
1175 sv_magic((SV*)av, NULL, PERL_MAGIC_regdata, NULL, 0);
1181 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1182 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1183 "$%c is no longer supported", *name);
1186 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1189 case '\010': /* $^H */
1191 HV *const hv = GvHVn(gv);
1192 hv_magic(hv, NULL, PERL_MAGIC_hints);
1199 AV* const av = GvAVn(gv);
1200 HV* const hv = GvHVn(gv);
1201 sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, NULL, 0);
1203 hv_magic(hv, NULL, PERL_MAGIC_regdata_names);
1207 case '\023': /* $^S */
1218 SvREADONLY_on(GvSVn(gv));
1233 case '\001': /* $^A */
1234 case '\003': /* $^C */
1235 case '\004': /* $^D */
1236 case '\005': /* $^E */
1237 case '\006': /* $^F */
1238 case '\011': /* $^I, NOT \t in EBCDIC */
1239 case '\016': /* $^N */
1240 case '\017': /* $^O */
1241 case '\020': /* $^P */
1242 case '\024': /* $^T */
1243 case '\027': /* $^W */
1245 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1248 case '\014': /* $^L */
1249 sv_setpvn(GvSVn(gv),"\f",1);
1250 PL_formfeed = GvSVn(gv);
1253 sv_setpvn(GvSVn(gv),"\034",1);
1257 SV * const sv = GvSVn(gv);
1258 if (!sv_derived_from(PL_patchlevel, "version"))
1259 upg_version(PL_patchlevel);
1260 GvSV(gv) = vnumify(PL_patchlevel);
1261 SvREADONLY_on(GvSV(gv));
1265 case '\026': /* $^V */
1267 SV * const sv = GvSVn(gv);
1268 GvSV(gv) = new_version(PL_patchlevel);
1269 SvREADONLY_on(GvSV(gv));
1279 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1283 const HV * const hv = GvSTASH(gv);
1288 sv_setpv(sv, prefix ? prefix : "");
1290 name = HvNAME_get(hv);
1292 namelen = HvNAMELEN_get(hv);
1298 if (keepmain || strNE(name, "main")) {
1299 sv_catpvn(sv,name,namelen);
1302 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1306 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1308 const GV * const egv = GvEGV(gv);
1309 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1317 IO * const io = (IO*)newSV(0);
1319 sv_upgrade((SV *)io,SVt_PVIO);
1320 /* This used to read SvREFCNT(io) = 1;
1321 It's not clear why the reference count needed an explicit reset. NWC
1323 assert (SvREFCNT(io) == 1);
1325 /* Clear the stashcache because a new IO could overrule a package name */
1326 hv_clear(PL_stashcache);
1327 iogv = gv_fetchpvs("FileHandle::", 0, SVt_PVHV);
1328 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1329 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1330 iogv = gv_fetchpvs("IO::Handle::", GV_ADD, SVt_PVHV);
1331 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1336 Perl_gv_check(pTHX_ const HV *stash)
1341 if (!HvARRAY(stash))
1343 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1345 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1348 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1349 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1351 if (hv != PL_defstash && hv != stash)
1352 gv_check(hv); /* nested package */
1354 else if (isALPHA(*HeKEY(entry))) {
1356 gv = (GV*)HeVAL(entry);
1357 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1360 /* performance hack: if filename is absolute and it's a standard
1361 * module, don't bother warning */
1362 #ifdef MACOS_TRADITIONAL
1363 # define LIB_COMPONENT ":lib:"
1365 # define LIB_COMPONENT "/lib/"
1368 && PERL_FILE_IS_ABSOLUTE(file)
1369 && (instr(file, LIB_COMPONENT) || instr(file, ".pm")))
1373 CopLINE_set(PL_curcop, GvLINE(gv));
1375 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1377 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1379 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1380 "Name \"%s::%s\" used only once: possible typo",
1381 HvNAME_get(stash), GvNAME(gv));
1388 Perl_newGVgen(pTHX_ const char *pack)
1391 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1395 /* hopefully this is only called on local symbol table entries */
1398 Perl_gp_ref(pTHX_ GP *gp)
1406 /* multi-named GPs cannot be used for method cache */
1407 SvREFCNT_dec(gp->gp_cv);
1412 /* Adding a new name to a subroutine invalidates method cache */
1413 PL_sub_generation++;
1420 Perl_gp_free(pTHX_ GV *gv)
1425 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
1427 if (gp->gp_refcnt == 0) {
1428 if (ckWARN_d(WARN_INTERNAL))
1429 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1430 "Attempt to free unreferenced glob pointers"
1431 pTHX__FORMAT pTHX__VALUE);
1435 /* Deleting the name of a subroutine invalidates method cache */
1436 PL_sub_generation++;
1438 if (--gp->gp_refcnt > 0) {
1439 if (gp->gp_egv == gv)
1445 if (gp->gp_file_hek)
1446 unshare_hek(gp->gp_file_hek);
1447 SvREFCNT_dec(gp->gp_sv);
1448 SvREFCNT_dec(gp->gp_av);
1449 /* FIXME - another reference loop GV -> symtab -> GV ?
1450 Somehow gp->gp_hv can end up pointing at freed garbage. */
1451 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1452 const char *hvname = HvNAME_get(gp->gp_hv);
1453 if (PL_stashcache && hvname)
1454 hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv),
1456 SvREFCNT_dec(gp->gp_hv);
1458 SvREFCNT_dec(gp->gp_io);
1459 SvREFCNT_dec(gp->gp_cv);
1460 SvREFCNT_dec(gp->gp_form);
1467 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1469 AMT * const amtp = (AMT*)mg->mg_ptr;
1470 PERL_UNUSED_ARG(sv);
1472 if (amtp && AMT_AMAGIC(amtp)) {
1474 for (i = 1; i < NofAMmeth; i++) {
1475 CV * const cv = amtp->table[i];
1477 SvREFCNT_dec((SV *) cv);
1478 amtp->table[i] = NULL;
1485 /* Updates and caches the CV's */
1488 Perl_Gv_AMupdate(pTHX_ HV *stash)
1491 MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1495 const AMT * const amtp = (AMT*)mg->mg_ptr;
1496 if (amtp->was_ok_am == PL_amagic_generation
1497 && amtp->was_ok_sub == PL_sub_generation) {
1498 return (bool)AMT_OVERLOADED(amtp);
1500 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1503 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1506 amt.was_ok_am = PL_amagic_generation;
1507 amt.was_ok_sub = PL_sub_generation;
1508 amt.fallback = AMGfallNO;
1512 int filled = 0, have_ovl = 0;
1515 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1517 /* Try to find via inheritance. */
1518 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1519 SV * const sv = gv ? GvSV(gv) : NULL;
1523 lim = DESTROY_amg; /* Skip overloading entries. */
1524 #ifdef PERL_DONT_CREATE_GVSV
1526 NOOP; /* Equivalent to !SvTRUE and !SvOK */
1529 else if (SvTRUE(sv))
1530 amt.fallback=AMGfallYES;
1532 amt.fallback=AMGfallNEVER;
1534 for (i = 1; i < lim; i++)
1535 amt.table[i] = NULL;
1536 for (; i < NofAMmeth; i++) {
1537 const char * const cooky = PL_AMG_names[i];
1538 /* Human-readable form, for debugging: */
1539 const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1540 const STRLEN l = strlen(cooky);
1542 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1543 cp, HvNAME_get(stash)) );
1544 /* don't fill the cache while looking up!
1545 Creation of inheritance stubs in intermediate packages may
1546 conflict with the logic of runtime method substitution.
1547 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1548 then we could have created stubs for "(+0" in A and C too.
1549 But if B overloads "bool", we may want to use it for
1550 numifying instead of C's "+0". */
1551 if (i >= DESTROY_amg)
1552 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1553 else /* Autoload taken care of below */
1554 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1556 if (gv && (cv = GvCV(gv))) {
1558 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1559 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1560 /* This is a hack to support autoloading..., while
1561 knowing *which* methods were declared as overloaded. */
1562 /* GvSV contains the name of the method. */
1564 SV *gvsv = GvSV(gv);
1566 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1567 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1568 (void*)GvSV(gv), cp, hvname) );
1569 if (!gvsv || !SvPOK(gvsv)
1570 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1573 /* Can be an import stub (created by "can"). */
1574 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1575 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1576 "in package \"%.256s\"",
1577 (GvCVGEN(gv) ? "Stub found while resolving"
1581 cv = GvCV(gv = ngv);
1583 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1584 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1585 GvNAME(CvGV(cv))) );
1587 if (i < DESTROY_amg)
1589 } else if (gv) { /* Autoloaded... */
1593 amt.table[i]=(CV*)SvREFCNT_inc_simple(cv);
1596 AMT_AMAGIC_on(&amt);
1598 AMT_OVERLOADED_on(&amt);
1599 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1600 (char*)&amt, sizeof(AMT));
1604 /* Here we have no table: */
1606 AMT_AMAGIC_off(&amt);
1607 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1608 (char*)&amt, sizeof(AMTS));
1614 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1620 if (!stash || !HvNAME_get(stash))
1622 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1626 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1629 amtp = (AMT*)mg->mg_ptr;
1630 if ( amtp->was_ok_am != PL_amagic_generation
1631 || amtp->was_ok_sub != PL_sub_generation )
1633 if (AMT_AMAGIC(amtp)) {
1634 CV * const ret = amtp->table[id];
1635 if (ret && isGV(ret)) { /* Autoloading stab */
1636 /* Passing it through may have resulted in a warning
1637 "Inherited AUTOLOAD for a non-method deprecated", since
1638 our caller is going through a function call, not a method call.
1639 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1640 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1653 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1658 CV **cvp=NULL, **ocvp=NULL;
1659 AMT *amtp=NULL, *oamtp=NULL;
1660 int off = 0, off1, lr = 0, notfound = 0;
1661 int postpr = 0, force_cpy = 0;
1662 int assign = AMGf_assign & flags;
1663 const int assignshift = assign ? 1 : 0;
1668 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1669 && (stash = SvSTASH(SvRV(left)))
1670 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1671 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1672 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1674 && ((cv = cvp[off=method+assignshift])
1675 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1681 cv = cvp[off=method])))) {
1682 lr = -1; /* Call method for left argument */
1684 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1687 /* look for substituted methods */
1688 /* In all the covered cases we should be called with assign==0. */
1692 if ((cv = cvp[off=add_ass_amg])
1693 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1694 right = &PL_sv_yes; lr = -1; assign = 1;
1699 if ((cv = cvp[off = subtr_ass_amg])
1700 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1701 right = &PL_sv_yes; lr = -1; assign = 1;
1705 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1708 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1711 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1714 (void)((cv = cvp[off=bool__amg])
1715 || (cv = cvp[off=numer_amg])
1716 || (cv = cvp[off=string_amg]));
1722 * SV* ref causes confusion with the interpreter variable of
1725 SV* const tmpRef=SvRV(left);
1726 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1728 * Just to be extra cautious. Maybe in some
1729 * additional cases sv_setsv is safe, too.
1731 SV* const newref = newSVsv(tmpRef);
1732 SvOBJECT_on(newref);
1733 /* As a bit of a source compatibility hack, SvAMAGIC() and
1734 friends dereference an RV, to behave the same was as when
1735 overloading was stored on the reference, not the referant.
1736 Hence we can't use SvAMAGIC_on()
1738 SvFLAGS(newref) |= SVf_AMAGIC;
1739 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1745 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1746 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1747 SV* const nullsv=sv_2mortal(newSViv(0));
1749 SV* const lessp = amagic_call(left,nullsv,
1750 lt_amg,AMGf_noright);
1751 logic = SvTRUE(lessp);
1753 SV* const lessp = amagic_call(left,nullsv,
1754 ncmp_amg,AMGf_noright);
1755 logic = (SvNV(lessp) < 0);
1758 if (off==subtr_amg) {
1769 if ((cv = cvp[off=subtr_amg])) {
1771 left = sv_2mortal(newSViv(0));
1776 case iter_amg: /* XXXX Eventually should do to_gv. */
1778 return NULL; /* Delegate operation to standard mechanisms. */
1786 return left; /* Delegate operation to standard mechanisms. */
1791 if (!cv) goto not_found;
1792 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1793 && (stash = SvSTASH(SvRV(right)))
1794 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1795 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1796 ? (amtp = (AMT*)mg->mg_ptr)->table
1798 && (cv = cvp[off=method])) { /* Method for right
1801 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1802 && (cvp=ocvp) && (lr = -1))
1803 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1804 && !(flags & AMGf_unary)) {
1805 /* We look for substitution for
1806 * comparison operations and
1808 if (method==concat_amg || method==concat_ass_amg
1809 || method==repeat_amg || method==repeat_ass_amg) {
1810 return NULL; /* Delegate operation to string conversion */
1820 postpr = 1; off=ncmp_amg; break;
1827 postpr = 1; off=scmp_amg; break;
1829 if (off != -1) cv = cvp[off];
1834 not_found: /* No method found, either report or croak */
1842 return left; /* Delegate operation to standard mechanisms. */
1845 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1846 notfound = 1; lr = -1;
1847 } else if (cvp && (cv=cvp[nomethod_amg])) {
1848 notfound = 1; lr = 1;
1849 } else if ((amtp && amtp->fallback >= AMGfallYES) && !DEBUG_o_TEST) {
1850 /* Skip generating the "no method found" message. */
1854 if (off==-1) off=method;
1855 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1856 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1857 AMG_id2name(method + assignshift),
1858 (flags & AMGf_unary ? " " : "\n\tleft "),
1860 "in overloaded package ":
1861 "has no overloaded magic",
1863 HvNAME_get(SvSTASH(SvRV(left))):
1866 ",\n\tright argument in overloaded package ":
1869 : ",\n\tright argument has no overloaded magic"),
1871 HvNAME_get(SvSTASH(SvRV(right))):
1873 if (amtp && amtp->fallback >= AMGfallYES) {
1874 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1876 Perl_croak(aTHX_ "%"SVf, (void*)msg);
1880 force_cpy = force_cpy || assign;
1885 DEBUG_o(Perl_deb(aTHX_
1886 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1888 method+assignshift==off? "" :
1890 method+assignshift==off? "" :
1891 AMG_id2name(method+assignshift),
1892 method+assignshift==off? "" : "\")",
1893 flags & AMGf_unary? "" :
1894 lr==1 ? " for right argument": " for left argument",
1895 flags & AMGf_unary? " for argument" : "",
1896 stash ? HvNAME_get(stash) : "null",
1897 fl? ",\n\tassignment variant used": "") );
1900 /* Since we use shallow copy during assignment, we need
1901 * to dublicate the contents, probably calling user-supplied
1902 * version of copy operator
1904 /* We need to copy in following cases:
1905 * a) Assignment form was called.
1906 * assignshift==1, assign==T, method + 1 == off
1907 * b) Increment or decrement, called directly.
1908 * assignshift==0, assign==0, method + 0 == off
1909 * c) Increment or decrement, translated to assignment add/subtr.
1910 * assignshift==0, assign==T,
1912 * d) Increment or decrement, translated to nomethod.
1913 * assignshift==0, assign==0,
1915 * e) Assignment form translated to nomethod.
1916 * assignshift==1, assign==T, method + 1 != off
1919 /* off is method, method+assignshift, or a result of opcode substitution.
1920 * In the latter case assignshift==0, so only notfound case is important.
1922 if (( (method + assignshift == off)
1923 && (assign || (method == inc_amg) || (method == dec_amg)))
1930 const bool oldcatch = CATCH_GET;
1933 Zero(&myop, 1, BINOP);
1934 myop.op_last = (OP *) &myop;
1935 myop.op_next = NULL;
1936 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1938 PUSHSTACKi(PERLSI_OVERLOAD);
1941 PL_op = (OP *) &myop;
1942 if (PERLDB_SUB && PL_curstash != PL_debstash)
1943 PL_op->op_private |= OPpENTERSUB_DB;
1947 EXTEND(SP, notfound + 5);
1948 PUSHs(lr>0? right: left);
1949 PUSHs(lr>0? left: right);
1950 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1952 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1957 if ((PL_op = Perl_pp_entersub(aTHX)))
1965 CATCH_SET(oldcatch);
1972 ans=SvIV(res)<=0; break;
1975 ans=SvIV(res)<0; break;
1978 ans=SvIV(res)>=0; break;
1981 ans=SvIV(res)>0; break;
1984 ans=SvIV(res)==0; break;
1987 ans=SvIV(res)!=0; break;
1990 SvSetSV(left,res); return left;
1992 ans=!SvTRUE(res); break;
1997 } else if (method==copy_amg) {
1999 Perl_croak(aTHX_ "Copy method did not return a reference");
2001 return SvREFCNT_inc(SvRV(res));
2009 =for apidoc is_gv_magical_sv
2011 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
2017 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
2020 const char * const temp = SvPV_const(name, len);
2021 return is_gv_magical(temp, len, flags);
2025 =for apidoc is_gv_magical
2027 Returns C<TRUE> if given the name of a magical GV.
2029 Currently only useful internally when determining if a GV should be
2030 created even in rvalue contexts.
2032 C<flags> is not used at present but available for future extension to
2033 allow selecting particular classes of magical variable.
2035 Currently assumes that C<name> is NUL terminated (as well as len being valid).
2036 This assumption is met by all callers within the perl core, which all pass
2037 pointers returned by SvPV.
2042 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
2044 PERL_UNUSED_CONTEXT;
2045 PERL_UNUSED_ARG(flags);
2048 const char * const name1 = name + 1;
2051 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
2055 if (len == 8 && strEQ(name1, "VERLOAD"))
2059 if (len == 3 && name[1] == 'I' && name[2] == 'G')
2062 /* Using ${^...} variables is likely to be sufficiently rare that
2063 it seems sensible to avoid the space hit of also checking the
2065 case '\017': /* ${^OPEN} */
2066 if (strEQ(name1, "PEN"))
2069 case '\024': /* ${^TAINT} */
2070 if (strEQ(name1, "AINT"))
2073 case '\025': /* ${^UNICODE} */
2074 if (strEQ(name1, "NICODE"))
2076 if (strEQ(name1, "TF8LOCALE"))
2079 case '\027': /* ${^WARNING_BITS} */
2080 if (strEQ(name1, "ARNING_BITS"))
2093 const char *end = name + len;
2094 while (--end > name) {
2102 /* Because we're already assuming that name is NUL terminated
2103 below, we can treat an empty name as "\0" */
2130 case '\001': /* $^A */
2131 case '\003': /* $^C */
2132 case '\004': /* $^D */
2133 case '\005': /* $^E */
2134 case '\006': /* $^F */
2135 case '\010': /* $^H */
2136 case '\011': /* $^I, NOT \t in EBCDIC */
2137 case '\014': /* $^L */
2138 case '\016': /* $^N */
2139 case '\017': /* $^O */
2140 case '\020': /* $^P */
2141 case '\023': /* $^S */
2142 case '\024': /* $^T */
2143 case '\026': /* $^V */
2144 case '\027': /* $^W */
2164 Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
2170 PERL_UNUSED_ARG(flags);
2173 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
2175 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
2176 unshare_hek(GvNAME_HEK(gv));
2179 PERL_HASH(hash, name, len);
2180 GvNAME_HEK(gv) = share_hek(name, len, hash);
2185 * c-indentation-style: bsd
2187 * indent-tabs-mode: t
2190 * ex: set ts=8 sts=4 sw=4 noet: