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 unshare_hek(gp->gp_file_hek);
1446 SvREFCNT_dec(gp->gp_sv);
1447 SvREFCNT_dec(gp->gp_av);
1448 /* FIXME - another reference loop GV -> symtab -> GV ?
1449 Somehow gp->gp_hv can end up pointing at freed garbage. */
1450 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1451 const char *hvname = HvNAME_get(gp->gp_hv);
1452 if (PL_stashcache && hvname)
1453 hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv),
1455 SvREFCNT_dec(gp->gp_hv);
1457 SvREFCNT_dec(gp->gp_io);
1458 SvREFCNT_dec(gp->gp_cv);
1459 SvREFCNT_dec(gp->gp_form);
1466 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1468 AMT * const amtp = (AMT*)mg->mg_ptr;
1469 PERL_UNUSED_ARG(sv);
1471 if (amtp && AMT_AMAGIC(amtp)) {
1473 for (i = 1; i < NofAMmeth; i++) {
1474 CV * const cv = amtp->table[i];
1476 SvREFCNT_dec((SV *) cv);
1477 amtp->table[i] = NULL;
1484 /* Updates and caches the CV's */
1487 Perl_Gv_AMupdate(pTHX_ HV *stash)
1490 MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1494 const AMT * const amtp = (AMT*)mg->mg_ptr;
1495 if (amtp->was_ok_am == PL_amagic_generation
1496 && amtp->was_ok_sub == PL_sub_generation) {
1497 return (bool)AMT_OVERLOADED(amtp);
1499 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1502 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1505 amt.was_ok_am = PL_amagic_generation;
1506 amt.was_ok_sub = PL_sub_generation;
1507 amt.fallback = AMGfallNO;
1511 int filled = 0, have_ovl = 0;
1514 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1516 /* Try to find via inheritance. */
1517 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1518 SV * const sv = gv ? GvSV(gv) : NULL;
1522 lim = DESTROY_amg; /* Skip overloading entries. */
1523 #ifdef PERL_DONT_CREATE_GVSV
1525 NOOP; /* Equivalent to !SvTRUE and !SvOK */
1528 else if (SvTRUE(sv))
1529 amt.fallback=AMGfallYES;
1531 amt.fallback=AMGfallNEVER;
1533 for (i = 1; i < lim; i++)
1534 amt.table[i] = NULL;
1535 for (; i < NofAMmeth; i++) {
1536 const char * const cooky = PL_AMG_names[i];
1537 /* Human-readable form, for debugging: */
1538 const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1539 const STRLEN l = strlen(cooky);
1541 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1542 cp, HvNAME_get(stash)) );
1543 /* don't fill the cache while looking up!
1544 Creation of inheritance stubs in intermediate packages may
1545 conflict with the logic of runtime method substitution.
1546 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1547 then we could have created stubs for "(+0" in A and C too.
1548 But if B overloads "bool", we may want to use it for
1549 numifying instead of C's "+0". */
1550 if (i >= DESTROY_amg)
1551 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1552 else /* Autoload taken care of below */
1553 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1555 if (gv && (cv = GvCV(gv))) {
1557 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1558 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1559 /* This is a hack to support autoloading..., while
1560 knowing *which* methods were declared as overloaded. */
1561 /* GvSV contains the name of the method. */
1563 SV *gvsv = GvSV(gv);
1565 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1566 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1567 (void*)GvSV(gv), cp, hvname) );
1568 if (!gvsv || !SvPOK(gvsv)
1569 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1572 /* Can be an import stub (created by "can"). */
1573 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1574 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1575 "in package \"%.256s\"",
1576 (GvCVGEN(gv) ? "Stub found while resolving"
1580 cv = GvCV(gv = ngv);
1582 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1583 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1584 GvNAME(CvGV(cv))) );
1586 if (i < DESTROY_amg)
1588 } else if (gv) { /* Autoloaded... */
1592 amt.table[i]=(CV*)SvREFCNT_inc_simple(cv);
1595 AMT_AMAGIC_on(&amt);
1597 AMT_OVERLOADED_on(&amt);
1598 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1599 (char*)&amt, sizeof(AMT));
1603 /* Here we have no table: */
1605 AMT_AMAGIC_off(&amt);
1606 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1607 (char*)&amt, sizeof(AMTS));
1613 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1619 if (!stash || !HvNAME_get(stash))
1621 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1625 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1628 amtp = (AMT*)mg->mg_ptr;
1629 if ( amtp->was_ok_am != PL_amagic_generation
1630 || amtp->was_ok_sub != PL_sub_generation )
1632 if (AMT_AMAGIC(amtp)) {
1633 CV * const ret = amtp->table[id];
1634 if (ret && isGV(ret)) { /* Autoloading stab */
1635 /* Passing it through may have resulted in a warning
1636 "Inherited AUTOLOAD for a non-method deprecated", since
1637 our caller is going through a function call, not a method call.
1638 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1639 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1652 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1657 CV **cvp=NULL, **ocvp=NULL;
1658 AMT *amtp=NULL, *oamtp=NULL;
1659 int off = 0, off1, lr = 0, notfound = 0;
1660 int postpr = 0, force_cpy = 0;
1661 int assign = AMGf_assign & flags;
1662 const int assignshift = assign ? 1 : 0;
1667 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1668 && (stash = SvSTASH(SvRV(left)))
1669 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1670 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1671 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1673 && ((cv = cvp[off=method+assignshift])
1674 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1680 cv = cvp[off=method])))) {
1681 lr = -1; /* Call method for left argument */
1683 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1686 /* look for substituted methods */
1687 /* In all the covered cases we should be called with assign==0. */
1691 if ((cv = cvp[off=add_ass_amg])
1692 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1693 right = &PL_sv_yes; lr = -1; assign = 1;
1698 if ((cv = cvp[off = subtr_ass_amg])
1699 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1700 right = &PL_sv_yes; lr = -1; assign = 1;
1704 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1707 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1710 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1713 (void)((cv = cvp[off=bool__amg])
1714 || (cv = cvp[off=numer_amg])
1715 || (cv = cvp[off=string_amg]));
1721 * SV* ref causes confusion with the interpreter variable of
1724 SV* const tmpRef=SvRV(left);
1725 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1727 * Just to be extra cautious. Maybe in some
1728 * additional cases sv_setsv is safe, too.
1730 SV* const newref = newSVsv(tmpRef);
1731 SvOBJECT_on(newref);
1732 /* As a bit of a source compatibility hack, SvAMAGIC() and
1733 friends dereference an RV, to behave the same was as when
1734 overloading was stored on the reference, not the referant.
1735 Hence we can't use SvAMAGIC_on()
1737 SvFLAGS(newref) |= SVf_AMAGIC;
1738 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1744 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1745 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1746 SV* const nullsv=sv_2mortal(newSViv(0));
1748 SV* const lessp = amagic_call(left,nullsv,
1749 lt_amg,AMGf_noright);
1750 logic = SvTRUE(lessp);
1752 SV* const lessp = amagic_call(left,nullsv,
1753 ncmp_amg,AMGf_noright);
1754 logic = (SvNV(lessp) < 0);
1757 if (off==subtr_amg) {
1768 if ((cv = cvp[off=subtr_amg])) {
1770 left = sv_2mortal(newSViv(0));
1775 case iter_amg: /* XXXX Eventually should do to_gv. */
1777 return NULL; /* Delegate operation to standard mechanisms. */
1785 return left; /* Delegate operation to standard mechanisms. */
1790 if (!cv) goto not_found;
1791 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1792 && (stash = SvSTASH(SvRV(right)))
1793 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1794 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1795 ? (amtp = (AMT*)mg->mg_ptr)->table
1797 && (cv = cvp[off=method])) { /* Method for right
1800 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1801 && (cvp=ocvp) && (lr = -1))
1802 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1803 && !(flags & AMGf_unary)) {
1804 /* We look for substitution for
1805 * comparison operations and
1807 if (method==concat_amg || method==concat_ass_amg
1808 || method==repeat_amg || method==repeat_ass_amg) {
1809 return NULL; /* Delegate operation to string conversion */
1819 postpr = 1; off=ncmp_amg; break;
1826 postpr = 1; off=scmp_amg; break;
1828 if (off != -1) cv = cvp[off];
1833 not_found: /* No method found, either report or croak */
1841 return left; /* Delegate operation to standard mechanisms. */
1844 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1845 notfound = 1; lr = -1;
1846 } else if (cvp && (cv=cvp[nomethod_amg])) {
1847 notfound = 1; lr = 1;
1848 } else if ((amtp && amtp->fallback >= AMGfallYES) && !DEBUG_o_TEST) {
1849 /* Skip generating the "no method found" message. */
1853 if (off==-1) off=method;
1854 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1855 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1856 AMG_id2name(method + assignshift),
1857 (flags & AMGf_unary ? " " : "\n\tleft "),
1859 "in overloaded package ":
1860 "has no overloaded magic",
1862 HvNAME_get(SvSTASH(SvRV(left))):
1865 ",\n\tright argument in overloaded package ":
1868 : ",\n\tright argument has no overloaded magic"),
1870 HvNAME_get(SvSTASH(SvRV(right))):
1872 if (amtp && amtp->fallback >= AMGfallYES) {
1873 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1875 Perl_croak(aTHX_ "%"SVf, (void*)msg);
1879 force_cpy = force_cpy || assign;
1884 DEBUG_o(Perl_deb(aTHX_
1885 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1887 method+assignshift==off? "" :
1889 method+assignshift==off? "" :
1890 AMG_id2name(method+assignshift),
1891 method+assignshift==off? "" : "\")",
1892 flags & AMGf_unary? "" :
1893 lr==1 ? " for right argument": " for left argument",
1894 flags & AMGf_unary? " for argument" : "",
1895 stash ? HvNAME_get(stash) : "null",
1896 fl? ",\n\tassignment variant used": "") );
1899 /* Since we use shallow copy during assignment, we need
1900 * to dublicate the contents, probably calling user-supplied
1901 * version of copy operator
1903 /* We need to copy in following cases:
1904 * a) Assignment form was called.
1905 * assignshift==1, assign==T, method + 1 == off
1906 * b) Increment or decrement, called directly.
1907 * assignshift==0, assign==0, method + 0 == off
1908 * c) Increment or decrement, translated to assignment add/subtr.
1909 * assignshift==0, assign==T,
1911 * d) Increment or decrement, translated to nomethod.
1912 * assignshift==0, assign==0,
1914 * e) Assignment form translated to nomethod.
1915 * assignshift==1, assign==T, method + 1 != off
1918 /* off is method, method+assignshift, or a result of opcode substitution.
1919 * In the latter case assignshift==0, so only notfound case is important.
1921 if (( (method + assignshift == off)
1922 && (assign || (method == inc_amg) || (method == dec_amg)))
1929 const bool oldcatch = CATCH_GET;
1932 Zero(&myop, 1, BINOP);
1933 myop.op_last = (OP *) &myop;
1934 myop.op_next = NULL;
1935 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1937 PUSHSTACKi(PERLSI_OVERLOAD);
1940 PL_op = (OP *) &myop;
1941 if (PERLDB_SUB && PL_curstash != PL_debstash)
1942 PL_op->op_private |= OPpENTERSUB_DB;
1946 EXTEND(SP, notfound + 5);
1947 PUSHs(lr>0? right: left);
1948 PUSHs(lr>0? left: right);
1949 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1951 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1956 if ((PL_op = Perl_pp_entersub(aTHX)))
1964 CATCH_SET(oldcatch);
1971 ans=SvIV(res)<=0; break;
1974 ans=SvIV(res)<0; break;
1977 ans=SvIV(res)>=0; break;
1980 ans=SvIV(res)>0; break;
1983 ans=SvIV(res)==0; break;
1986 ans=SvIV(res)!=0; break;
1989 SvSetSV(left,res); return left;
1991 ans=!SvTRUE(res); break;
1996 } else if (method==copy_amg) {
1998 Perl_croak(aTHX_ "Copy method did not return a reference");
2000 return SvREFCNT_inc(SvRV(res));
2008 =for apidoc is_gv_magical_sv
2010 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
2016 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
2019 const char * const temp = SvPV_const(name, len);
2020 return is_gv_magical(temp, len, flags);
2024 =for apidoc is_gv_magical
2026 Returns C<TRUE> if given the name of a magical GV.
2028 Currently only useful internally when determining if a GV should be
2029 created even in rvalue contexts.
2031 C<flags> is not used at present but available for future extension to
2032 allow selecting particular classes of magical variable.
2034 Currently assumes that C<name> is NUL terminated (as well as len being valid).
2035 This assumption is met by all callers within the perl core, which all pass
2036 pointers returned by SvPV.
2041 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
2043 PERL_UNUSED_CONTEXT;
2044 PERL_UNUSED_ARG(flags);
2047 const char * const name1 = name + 1;
2050 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
2054 if (len == 8 && strEQ(name1, "VERLOAD"))
2058 if (len == 3 && name[1] == 'I' && name[2] == 'G')
2061 /* Using ${^...} variables is likely to be sufficiently rare that
2062 it seems sensible to avoid the space hit of also checking the
2064 case '\017': /* ${^OPEN} */
2065 if (strEQ(name1, "PEN"))
2068 case '\024': /* ${^TAINT} */
2069 if (strEQ(name1, "AINT"))
2072 case '\025': /* ${^UNICODE} */
2073 if (strEQ(name1, "NICODE"))
2075 if (strEQ(name1, "TF8LOCALE"))
2078 case '\027': /* ${^WARNING_BITS} */
2079 if (strEQ(name1, "ARNING_BITS"))
2092 const char *end = name + len;
2093 while (--end > name) {
2101 /* Because we're already assuming that name is NUL terminated
2102 below, we can treat an empty name as "\0" */
2129 case '\001': /* $^A */
2130 case '\003': /* $^C */
2131 case '\004': /* $^D */
2132 case '\005': /* $^E */
2133 case '\006': /* $^F */
2134 case '\010': /* $^H */
2135 case '\011': /* $^I, NOT \t in EBCDIC */
2136 case '\014': /* $^L */
2137 case '\016': /* $^N */
2138 case '\017': /* $^O */
2139 case '\020': /* $^P */
2140 case '\023': /* $^S */
2141 case '\024': /* $^T */
2142 case '\026': /* $^V */
2143 case '\027': /* $^W */
2163 Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
2169 PERL_UNUSED_ARG(flags);
2172 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
2174 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
2175 unshare_hek(GvNAME_HEK(gv));
2178 PERL_HASH(hash, name, len);
2179 GvNAME_HEK(gv) = share_hek(name, len, hash);
2184 * c-indentation-style: bsd
2186 * indent-tabs-mode: t
2189 * ex: set ts=8 sts=4 sw=4 noet: