3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 * 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
12 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
13 * of your inquisitiveness, I shall spend all the rest of my days answering
14 * you. What more do you want to know?'
15 * 'The names of all the stars, and of all living things, and the whole
16 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
23 A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
24 It is a structure that holds a pointer to a scalar, an array, a hash etc,
25 corresponding to $foo, @foo, %foo.
27 GVs are usually found as values in stashes (symbol table hashes) where
28 Perl stores its global variables.
37 static const char S_autoload[] = "AUTOLOAD";
38 static const STRLEN S_autolen = sizeof(S_autoload)-1;
41 #ifdef PERL_DONT_CREATE_GVSV
43 Perl_gv_SVadd(pTHX_ GV *gv)
45 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
46 Perl_croak(aTHX_ "Bad symbol for scalar");
54 Perl_gv_AVadd(pTHX_ register GV *gv)
56 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
57 Perl_croak(aTHX_ "Bad symbol for array");
64 Perl_gv_HVadd(pTHX_ register GV *gv)
66 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
67 Perl_croak(aTHX_ "Bad symbol for hash");
74 Perl_gv_IOadd(pTHX_ register GV *gv)
77 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) {
80 * if it walks like a dirhandle, then let's assume that
81 * this is a dirhandle.
83 const char * const fh =
84 PL_op->op_type == OP_READDIR ||
85 PL_op->op_type == OP_TELLDIR ||
86 PL_op->op_type == OP_SEEKDIR ||
87 PL_op->op_type == OP_REWINDDIR ||
88 PL_op->op_type == OP_CLOSEDIR ?
89 "dirhandle" : "filehandle";
90 Perl_croak(aTHX_ "Bad symbol for %s", fh);
94 #ifdef GV_UNIQUE_CHECK
96 Perl_croak(aTHX_ "Bad symbol for filehandle (GV is unique)");
105 Perl_gv_fetchfile(pTHX_ const char *name)
116 tmplen = strlen(name) + 2;
117 if (tmplen < sizeof smallbuf)
120 Newx(tmpbuf, tmplen + 1, char);
121 /* This is where the debugger's %{"::_<$filename"} hash is created */
124 memcpy(tmpbuf + 2, name, tmplen - 1);
125 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
127 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
128 #ifdef PERL_DONT_CREATE_GVSV
129 GvSV(gv) = newSVpvn(name, tmplen - 2);
131 sv_setpvn(GvSV(gv), name, tmplen - 2);
134 hv_magic(GvHVn(gv_AVadd(gv)), NULL, PERL_MAGIC_dbfile);
136 if (tmpbuf != smallbuf)
142 =for apidoc gv_const_sv
144 If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
145 inlining, or C<gv> is a placeholder reference that would be promoted to such
146 a typeglob, then returns the value returned by the sub. Otherwise, returns
153 Perl_gv_const_sv(pTHX_ GV *gv)
155 if (SvTYPE(gv) == SVt_PVGV)
156 return cv_const_sv(GvCVu(gv));
157 return SvROK(gv) ? SvRV(gv) : NULL;
161 Perl_newGP(pTHX_ GV *const gv)
164 const char *const file
165 = (PL_curcop && CopFILE(PL_curcop)) ? CopFILE(PL_curcop) : "";
166 STRLEN len = strlen(file);
169 PERL_HASH(hash, file, len);
173 #ifndef PERL_DONT_CREATE_GVSV
174 gp->gv_sv = newSV(0);
177 gp->gp_line = PL_curcop ? CopLINE(PL_curcop) : 0;
178 /* XXX Ideally this cast would be replaced with a change to const char*
180 gp->gp_file_hek = share_hek(file, len, hash);
188 Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
191 const U32 old_type = SvTYPE(gv);
192 const bool doproto = old_type > SVt_NULL;
193 const char * const proto = (doproto && SvPOK(gv)) ? SvPVX_const(gv) : NULL;
194 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
195 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
197 assert (!(proto && has_constant));
200 /* The constant has to be a simple scalar type. */
201 switch (SvTYPE(has_constant)) {
207 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
208 sv_reftype(has_constant, 0));
216 if (old_type < SVt_PVGV) {
217 if (old_type >= SVt_PV)
219 sv_upgrade((SV*)gv, SVt_PVGV);
227 Safefree(SvPVX_mutable(gv));
232 GvGP(gv) = Perl_newGP(aTHX_ gv);
235 Perl_sv_add_backref(aTHX_ (SV*)stash, (SV*)gv);
236 gv_name_set(gv, name, len, GV_ADD);
237 if (multi || doproto) /* doproto means it _was_ mentioned */
239 if (doproto) { /* Replicate part of newSUB here. */
242 /* newCONSTSUB takes ownership of the reference from us. */
243 GvCV(gv) = newCONSTSUB(stash, name, has_constant);
244 /* If this reference was a copy of another, then the subroutine
245 must have been "imported", by a Perl space assignment to a GV
246 from a reference to CV. */
247 if (exported_constant)
248 GvIMPORTED_CV_on(gv);
250 /* XXX unsafe for threads if eval_owner isn't held */
251 (void) start_subparse(0,0); /* Create empty CV in compcv. */
252 GvCV(gv) = PL_compcv;
258 CvFILE_set_from_cop(GvCV(gv), PL_curcop);
259 CvSTASH(GvCV(gv)) = PL_curstash;
261 sv_setpv((SV*)GvCV(gv), proto);
268 S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
280 #ifdef PERL_DONT_CREATE_GVSV
293 =for apidoc gv_fetchmeth
295 Returns the glob with the given C<name> and a defined subroutine or
296 C<NULL>. The glob lives in the given C<stash>, or in the stashes
297 accessible via @ISA and UNIVERSAL::.
299 The argument C<level> should be either 0 or -1. If C<level==0>, as a
300 side-effect creates a glob with the given C<name> in the given C<stash>
301 which in the case of success contains an alias for the subroutine, and sets
302 up caching info for this glob. Similarly for all the searched stashes.
304 This function grants C<"SUPER"> token as a postfix of the stash name. The
305 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
306 visible to Perl code. So when calling C<call_sv>, you should not use
307 the GV directly; instead, you should use the method's CV, which can be
308 obtained from the GV with the C<GvCV> macro.
314 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
323 HV* lastchance = NULL;
325 /* UNIVERSAL methods should be callable without a stash */
327 level = -1; /* probably appropriate */
328 if(!(stash = gv_stashpvs("UNIVERSAL", FALSE)))
332 hvname = HvNAME_get(stash);
335 "Can't use anonymous symbol table for method lookup");
337 if ((level > 100) || (level < -100))
338 Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
341 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
343 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
348 if (SvTYPE(topgv) != SVt_PVGV)
349 gv_init(topgv, stash, name, len, TRUE);
350 if ((cv = GvCV(topgv))) {
351 /* If genuine method or valid cache entry, use it */
352 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
354 /* Stale cached entry: junk it */
356 GvCV(topgv) = cv = NULL;
359 else if (GvCVGEN(topgv) == PL_sub_generation)
360 return 0; /* cache indicates sub doesn't exist */
363 gvp = (GV**)hv_fetchs(stash, "ISA", FALSE);
364 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : NULL;
366 /* create and re-create @.*::SUPER::ISA on demand */
367 if (!av || !SvMAGIC(av)) {
368 STRLEN packlen = HvNAMELEN_get(stash);
370 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
374 basestash = gv_stashpvn(hvname, packlen, TRUE);
375 gvp = (GV**)hv_fetchs(basestash, "ISA", FALSE);
376 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
377 gvp = (GV**)hv_fetchs(stash, "ISA", TRUE);
378 if (!gvp || !(gv = *gvp))
379 Perl_croak(aTHX_ "Cannot create %s::ISA", hvname);
380 if (SvTYPE(gv) != SVt_PVGV)
381 gv_init(gv, stash, "ISA", 3, TRUE);
382 SvREFCNT_dec(GvAV(gv));
383 GvAV(gv) = (AV*)SvREFCNT_inc_simple(av);
389 SV** svp = AvARRAY(av);
390 /* NOTE: No support for tied ISA */
391 I32 items = AvFILLp(av) + 1;
393 SV* const sv = *svp++;
394 HV* const basestash = gv_stashsv(sv, FALSE);
396 if (ckWARN(WARN_MISC))
397 Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
401 gv = gv_fetchmeth(basestash, name, len,
402 (level >= 0) ? level + 1 : level - 1);
408 /* if at top level, try UNIVERSAL */
410 if (level == 0 || level == -1) {
411 lastchance = gv_stashpvs("UNIVERSAL", FALSE);
414 if ((gv = gv_fetchmeth(lastchance, name, len,
415 (level >= 0) ? level + 1 : level - 1)))
419 * Cache method in topgv if:
420 * 1. topgv has no synonyms (else inheritance crosses wires)
421 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
424 GvREFCNT(topgv) == 1 &&
426 (CvROOT(cv) || CvXSUB(cv)))
428 if ((cv = GvCV(topgv)))
430 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
431 GvCVGEN(topgv) = PL_sub_generation;
435 else if (topgv && GvREFCNT(topgv) == 1) {
436 /* cache the fact that the method is not defined */
437 GvCVGEN(topgv) = PL_sub_generation;
446 =for apidoc gv_fetchmeth_autoload
448 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
449 Returns a glob for the subroutine.
451 For an autoloaded subroutine without a GV, will create a GV even
452 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
453 of the result may be zero.
459 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
461 GV *gv = gv_fetchmeth(stash, name, len, level);
468 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
469 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
471 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
474 if (!(CvROOT(cv) || CvXSUB(cv)))
476 /* Have an autoload */
477 if (level < 0) /* Cannot do without a stub */
478 gv_fetchmeth(stash, name, len, 0);
479 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
488 =for apidoc gv_fetchmethod_autoload
490 Returns the glob which contains the subroutine to call to invoke the method
491 on the C<stash>. In fact in the presence of autoloading this may be the
492 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
495 The third parameter of C<gv_fetchmethod_autoload> determines whether
496 AUTOLOAD lookup is performed if the given method is not present: non-zero
497 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
498 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
499 with a non-zero C<autoload> parameter.
501 These functions grant C<"SUPER"> token as a prefix of the method name. Note
502 that if you want to keep the returned glob for a long time, you need to
503 check for it being "AUTOLOAD", since at the later time the call may load a
504 different subroutine due to $AUTOLOAD changing its value. Use the glob
505 created via a side effect to do this.
507 These functions have the same side-effects and as C<gv_fetchmeth> with
508 C<level==0>. C<name> should be writable if contains C<':'> or C<'
509 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
510 C<call_sv> apply equally to these functions.
516 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
519 register const char *nend;
520 const char *nsplit = NULL;
524 if (stash && SvTYPE(stash) < SVt_PVHV)
527 for (nend = name; *nend; nend++) {
530 else if (*nend == ':' && *(nend + 1) == ':')
534 const char * const origname = name;
538 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
539 /* ->SUPER::method should really be looked up in original stash */
540 SV * const tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
541 CopSTASHPV(PL_curcop)));
542 /* __PACKAGE__::SUPER stash should be autovivified */
543 stash = gv_stashpvn(SvPVX_const(tmpstr), SvCUR(tmpstr), TRUE);
544 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
545 origname, HvNAME_get(stash), name) );
548 /* don't autovifify if ->NoSuchStash::method */
549 stash = gv_stashpvn(origname, nsplit - origname, FALSE);
551 /* however, explicit calls to Pkg::SUPER::method may
552 happen, and may require autovivification to work */
553 if (!stash && (nsplit - origname) >= 7 &&
554 strnEQ(nsplit - 7, "::SUPER", 7) &&
555 gv_stashpvn(origname, nsplit - origname - 7, FALSE))
556 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
561 gv = gv_fetchmeth(stash, name, nend - name, 0);
563 if (strEQ(name,"import") || strEQ(name,"unimport"))
564 gv = (GV*)&PL_sv_yes;
566 gv = gv_autoload4(ostash, name, nend - name, TRUE);
569 CV* const cv = GvCV(gv);
570 if (!CvROOT(cv) && !CvXSUB(cv)) {
578 if (GvCV(stubgv) != cv) /* orphaned import */
581 autogv = gv_autoload4(GvSTASH(stubgv),
582 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
592 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
600 const char *packname = "";
601 STRLEN packname_len = 0;
603 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
606 if (SvTYPE(stash) < SVt_PVHV) {
607 packname = SvPV_const((SV*)stash, packname_len);
611 packname = HvNAME_get(stash);
612 packname_len = HvNAMELEN_get(stash);
615 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
619 if (!(CvROOT(cv) || CvXSUB(cv)))
623 * Inheriting AUTOLOAD for non-methods works ... for now.
625 if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
626 && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)
628 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
629 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
630 packname, (int)len, name);
633 /* rather than lookup/init $AUTOLOAD here
634 * only to have the XSUB do another lookup for $AUTOLOAD
635 * and split that value on the last '::',
636 * pass along the same data via some unused fields in the CV
639 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
645 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
646 * The subroutine's original name may not be "AUTOLOAD", so we don't
647 * use that, but for lack of anything better we will use the sub's
648 * original package to look up $AUTOLOAD.
650 varstash = GvSTASH(CvGV(cv));
651 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
655 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
656 #ifdef PERL_DONT_CREATE_GVSV
657 GvSV(vargv) = newSV(0);
661 varsv = GvSVn(vargv);
662 sv_setpvn(varsv, packname, packname_len);
663 sv_catpvs(varsv, "::");
664 sv_catpvn(varsv, name, len);
669 /* require_tie_mod() internal routine for requiring a module
670 * that implements the logic of automatical ties like %! and %-
672 * The "gv" parameter should be the glob.
673 * "varpv" holds the name of the var, used for error messages
674 * "namesv" holds the module name
675 * "methpv" holds the method name to test for to check that things
676 * are working reasonably close to as expected
677 * "flags" if flag & 1 then save the scalar before loading.
678 * For the protection of $! to work (it is set by this routine)
679 * the sv slot must already be magicalized.
682 S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
685 HV* stash = gv_stashsv(namesv, FALSE);
687 if (!stash || !(gv_fetchmethod(stash, methpv))) {
688 SV *module = newSVsv(namesv);
694 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
697 stash = gv_stashsv(namesv, FALSE);
699 Perl_croak( aTHX_ "panic: Can't use %%%s because %"SVf" is not available",
701 else if (!gv_fetchmethod(stash, methpv))
702 Perl_croak( aTHX_ "panic: Can't use %%%s because %"SVf" does not support method %s",
703 varpv, module, methpv);
709 =for apidoc gv_stashpv
711 Returns a pointer to the stash for a specified package. C<name> should
712 be a valid UTF-8 string and must be null-terminated. If C<create> is set
713 then the package will be created if it does not already exist. If C<create>
714 is not set and the package does not exist then NULL is returned.
720 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
722 return gv_stashpvn(name, strlen(name), create);
726 =for apidoc gv_stashpvn
728 Returns a pointer to the stash for a specified package. C<name> should
729 be a valid UTF-8 string. The C<namelen> parameter indicates the length of
730 the C<name>, in bytes. If C<create> is set then the package will be
731 created if it does not already exist. If C<create> is not set and the
732 package does not exist then NULL is returned.
738 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
745 if (namelen + 3 < sizeof smallbuf)
748 Newx(tmpbuf, namelen + 3, char);
749 Copy(name,tmpbuf,namelen,char);
750 tmpbuf[namelen++] = ':';
751 tmpbuf[namelen++] = ':';
752 tmpbuf[namelen] = '\0';
753 tmpgv = gv_fetchpvn_flags(tmpbuf, namelen, create, SVt_PVHV);
754 if (tmpbuf != smallbuf)
759 GvHV(tmpgv) = newHV();
761 if (!HvNAME_get(stash))
762 hv_name_set(stash, name, namelen, 0);
767 =for apidoc gv_stashsv
769 Returns a pointer to the stash for a specified package, which must be a
770 valid UTF-8 string. See C<gv_stashpv>.
776 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
779 const char * const ptr = SvPV_const(sv,len);
780 return gv_stashpvn(ptr, len, create);
785 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
786 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
790 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
792 const char * const nambeg = SvPV_const(name, len);
793 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
797 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
801 register const char *name = nambeg;
802 register GV *gv = NULL;
805 register const char *name_cursor;
807 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
808 const I32 no_expand = flags & GV_NOEXPAND;
810 flags & ~SVf_UTF8 & ~GV_NOADD_NOINIT & ~GV_NOEXPAND & ~GV_NOTQUAL;
811 const char *const name_end = nambeg + full_len;
812 const char *const name_em1 = name_end - 1;
814 if (flags & GV_NOTQUAL) {
815 /* Caller promised that there is no stash, so we can skip the check. */
820 if (full_len > 2 && *name == '*' && isALPHA(name[1])) {
821 /* accidental stringify on a GV? */
825 for (name_cursor = name; name_cursor < name_end; name_cursor++) {
826 if ((*name_cursor == ':' && name_cursor < name_em1
827 && name_cursor[1] == ':')
828 || (*name_cursor == '\'' && name_cursor[1]))
832 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
835 len = name_cursor - name;
840 if (len + 3 < (I32)sizeof (smallbuf))
843 Newx(tmpbuf, len+3, char);
844 Copy(name, tmpbuf, len, char);
848 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
849 gv = gvp ? *gvp : NULL;
850 if (gv && gv != (GV*)&PL_sv_undef) {
851 if (SvTYPE(gv) != SVt_PVGV)
852 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
856 if (tmpbuf != smallbuf)
858 if (!gv || gv == (GV*)&PL_sv_undef)
861 if (!(stash = GvHV(gv)))
862 stash = GvHV(gv) = newHV();
864 if (!HvNAME_get(stash))
865 hv_name_set(stash, nambeg, name_cursor - nambeg, 0);
868 if (*name_cursor == ':')
872 if (name == name_end)
873 return gv ? gv : (GV*)*hv_fetchs(PL_defstash, "main::", TRUE);
876 len = name_cursor - name;
878 /* No stash in name, so see how we can default */
882 if (len && isIDFIRST_lazy(name)) {
891 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
892 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
893 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
897 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
902 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
903 && name[3] == 'I' && name[4] == 'N')
907 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
908 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
909 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
913 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
914 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
922 else if (IN_PERL_COMPILETIME) {
924 if (add && (PL_hints & HINT_STRICT_VARS) &&
925 sv_type != SVt_PVCV &&
926 sv_type != SVt_PVGV &&
927 sv_type != SVt_PVFM &&
928 sv_type != SVt_PVIO &&
929 !(len == 1 && sv_type == SVt_PV &&
930 (*name == 'a' || *name == 'b')) )
932 gvp = (GV**)hv_fetch(stash,name,len,0);
934 *gvp == (GV*)&PL_sv_undef ||
935 SvTYPE(*gvp) != SVt_PVGV)
939 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
940 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
941 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
943 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
944 sv_type == SVt_PVAV ? '@' :
945 sv_type == SVt_PVHV ? '%' : '$',
948 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
954 stash = CopSTASH(PL_curcop);
960 /* By this point we should have a stash and a name */
964 SV * const err = Perl_mess(aTHX_
965 "Global symbol \"%s%s\" requires explicit package name",
966 (sv_type == SVt_PV ? "$"
967 : sv_type == SVt_PVAV ? "@"
968 : sv_type == SVt_PVHV ? "%"
971 if (USE_UTF8_IN_NAMES)
974 gv = gv_fetchpvn_flags("<none>::", 8, GV_ADDMULTI, SVt_PVHV);
976 /* symbol table under destruction */
985 if (!SvREFCNT(stash)) /* symbol table under destruction */
988 gvp = (GV**)hv_fetch(stash,name,len,add);
989 if (!gvp || *gvp == (GV*)&PL_sv_undef)
992 if (SvTYPE(gv) == SVt_PVGV) {
995 gv_init_sv(gv, sv_type);
996 if (sv_type == SVt_PVHV && len == 1 ) {
998 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1000 if (*name == '-' || *name == '+')
1001 require_tie_mod(gv, name, newSVpvs("re::Tie::Hash::NamedCapture"), "FETCH", 0);
1006 } else if (no_init) {
1008 } else if (no_expand && SvROK(gv)) {
1012 /* Adding a new symbol */
1014 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
1015 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
1016 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
1017 gv_init_sv(gv, sv_type);
1019 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
1020 : (PL_dowarn & G_WARN_ON ) ) )
1023 /* set up magic where warranted */
1028 /* Nothing else to do.
1029 The compiler will probably turn the switch statement into a
1030 branch table. Make sure we avoid even that small overhead for
1031 the common case of lower case variable names. */
1035 const char * const name2 = name + 1;
1038 if (strEQ(name2, "RGV")) {
1039 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1041 else if (strEQ(name2, "RGVOUT")) {
1046 if (strnEQ(name2, "XPORT", 5))
1050 if (strEQ(name2, "SA")) {
1051 AV* const av = GvAVn(gv);
1053 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, NULL, 0);
1054 /* NOTE: No support for tied ISA */
1055 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
1056 && AvFILLp(av) == -1)
1059 av_push(av, newSVpvn(pname = "NDBM_File",9));
1060 gv_stashpvn(pname, 9, TRUE);
1061 av_push(av, newSVpvn(pname = "DB_File",7));
1062 gv_stashpvn(pname, 7, TRUE);
1063 av_push(av, newSVpvn(pname = "GDBM_File",9));
1064 gv_stashpvn(pname, 9, TRUE);
1065 av_push(av, newSVpvn(pname = "SDBM_File",9));
1066 gv_stashpvn(pname, 9, TRUE);
1067 av_push(av, newSVpvn(pname = "ODBM_File",9));
1068 gv_stashpvn(pname, 9, TRUE);
1073 if (strEQ(name2, "VERLOAD")) {
1074 HV* const hv = GvHVn(gv);
1076 hv_magic(hv, NULL, PERL_MAGIC_overload);
1080 if (strEQ(name2, "IG")) {
1084 Newxz(PL_psig_ptr, SIG_SIZE, SV*);
1085 Newxz(PL_psig_name, SIG_SIZE, SV*);
1086 Newxz(PL_psig_pend, SIG_SIZE, int);
1090 hv_magic(hv, NULL, PERL_MAGIC_sig);
1091 for (i = 1; i < SIG_SIZE; i++) {
1092 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1094 sv_setsv(*init, &PL_sv_undef);
1096 PL_psig_name[i] = 0;
1097 PL_psig_pend[i] = 0;
1102 if (strEQ(name2, "ERSION"))
1105 case '\003': /* $^CHILD_ERROR_NATIVE */
1106 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1109 case '\005': /* $^ENCODING */
1110 if (strEQ(name2, "NCODING"))
1113 case '\017': /* $^OPEN */
1114 if (strEQ(name2, "PEN"))
1117 case '\024': /* ${^TAINT} */
1118 if (strEQ(name2, "AINT"))
1121 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1122 if (strEQ(name2, "NICODE"))
1124 if (strEQ(name2, "TF8LOCALE"))
1126 if (strEQ(name2, "TF8CACHE"))
1129 case '\027': /* $^WARNING_BITS */
1130 if (strEQ(name2, "ARNING_BITS"))
1143 /* ensures variable is only digits */
1144 /* ${"1foo"} fails this test (and is thus writeable) */
1145 /* added by japhy, but borrowed from is_gv_magical */
1146 const char *end = name + len;
1147 while (--end > name) {
1148 if (!isDIGIT(*end)) return gv;
1155 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1156 be case '\0' in this switch statement (ie a default case) */
1162 sv_type == SVt_PVAV ||
1163 sv_type == SVt_PVHV ||
1164 sv_type == SVt_PVCV ||
1165 sv_type == SVt_PVFM ||
1168 PL_sawampersand = TRUE;
1172 sv_setpv(GvSVn(gv),PL_chopset);
1176 #ifdef COMPLEX_STATUS
1177 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1183 /* If %! has been used, automatically load Errno.pm. */
1185 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1187 /* magicalization must be done before require_tie_mod is called */
1188 if (sv_type == SVt_PVHV)
1189 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
1194 GvMULTI_on(gv); /* no used once warnings here */
1196 bool plus = (*name == '+');
1197 SV *stashname = newSVpvs("re::Tie::Hash::NamedCapture");
1198 AV* const av = GvAVn(gv);
1199 HV *const hv = GvHVn(gv);
1200 HV *const hv_tie = newHV();
1201 SV *tie = newRV_noinc((SV*)hv_tie);
1203 sv_bless(tie, gv_stashsv(stashname,1));
1204 hv_magic(hv, (GV*)tie, PERL_MAGIC_tied);
1205 sv_magic((SV*)av, (plus ? (SV*)av : NULL), PERL_MAGIC_regdata, NULL, 0);
1206 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1209 SvREADONLY_on(GvSVn(gv));
1211 Perl_hv_store(aTHX_ hv_tie, STR_WITH_LEN("all"), newSViv(1), 0);
1217 if (sv_type == SVt_PVHV)
1218 require_tie_mod(gv, name, stashname, "FETCH", 0);
1224 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1225 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1226 "$%c is no longer supported", *name);
1229 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1232 case '\010': /* $^H */
1234 HV *const hv = GvHVn(gv);
1235 hv_magic(hv, NULL, PERL_MAGIC_hints);
1238 case '\023': /* $^S */
1249 SvREADONLY_on(GvSVn(gv));
1264 case '\001': /* $^A */
1265 case '\003': /* $^C */
1266 case '\004': /* $^D */
1267 case '\005': /* $^E */
1268 case '\006': /* $^F */
1269 case '\011': /* $^I, NOT \t in EBCDIC */
1270 case '\016': /* $^N */
1271 case '\017': /* $^O */
1272 case '\020': /* $^P */
1273 case '\024': /* $^T */
1274 case '\027': /* $^W */
1276 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1279 case '\014': /* $^L */
1280 sv_setpvn(GvSVn(gv),"\f",1);
1281 PL_formfeed = GvSVn(gv);
1284 sv_setpvn(GvSVn(gv),"\034",1);
1288 SV * const sv = GvSVn(gv);
1289 if (!sv_derived_from(PL_patchlevel, "version"))
1290 upg_version(PL_patchlevel);
1291 GvSV(gv) = vnumify(PL_patchlevel);
1292 SvREADONLY_on(GvSV(gv));
1296 case '\026': /* $^V */
1298 SV * const sv = GvSVn(gv);
1299 GvSV(gv) = new_version(PL_patchlevel);
1300 SvREADONLY_on(GvSV(gv));
1310 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1314 const HV * const hv = GvSTASH(gv);
1319 sv_setpv(sv, prefix ? prefix : "");
1321 name = HvNAME_get(hv);
1323 namelen = HvNAMELEN_get(hv);
1329 if (keepmain || strNE(name, "main")) {
1330 sv_catpvn(sv,name,namelen);
1333 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1337 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1339 const GV * const egv = GvEGV(gv);
1340 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1348 IO * const io = (IO*)newSV(0);
1350 sv_upgrade((SV *)io,SVt_PVIO);
1351 /* This used to read SvREFCNT(io) = 1;
1352 It's not clear why the reference count needed an explicit reset. NWC
1354 assert (SvREFCNT(io) == 1);
1356 /* Clear the stashcache because a new IO could overrule a package name */
1357 hv_clear(PL_stashcache);
1358 iogv = gv_fetchpvs("FileHandle::", 0, SVt_PVHV);
1359 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1360 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1361 iogv = gv_fetchpvs("IO::Handle::", GV_ADD, SVt_PVHV);
1362 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1367 Perl_gv_check(pTHX_ const HV *stash)
1372 if (!HvARRAY(stash))
1374 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1376 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1379 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1380 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1382 if (hv != PL_defstash && hv != stash)
1383 gv_check(hv); /* nested package */
1385 else if (isALPHA(*HeKEY(entry))) {
1387 gv = (GV*)HeVAL(entry);
1388 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1391 /* performance hack: if filename is absolute and it's a standard
1392 * module, don't bother warning */
1393 #ifdef MACOS_TRADITIONAL
1394 # define LIB_COMPONENT ":lib:"
1396 # define LIB_COMPONENT "/lib/"
1399 && PERL_FILE_IS_ABSOLUTE(file)
1400 && (instr(file, LIB_COMPONENT) || instr(file, ".pm")))
1404 CopLINE_set(PL_curcop, GvLINE(gv));
1406 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1408 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1410 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1411 "Name \"%s::%s\" used only once: possible typo",
1412 HvNAME_get(stash), GvNAME(gv));
1419 Perl_newGVgen(pTHX_ const char *pack)
1422 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1426 /* hopefully this is only called on local symbol table entries */
1429 Perl_gp_ref(pTHX_ GP *gp)
1437 /* multi-named GPs cannot be used for method cache */
1438 SvREFCNT_dec(gp->gp_cv);
1443 /* Adding a new name to a subroutine invalidates method cache */
1444 PL_sub_generation++;
1451 Perl_gp_free(pTHX_ GV *gv)
1456 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
1458 if (gp->gp_refcnt == 0) {
1459 if (ckWARN_d(WARN_INTERNAL))
1460 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1461 "Attempt to free unreferenced glob pointers"
1462 pTHX__FORMAT pTHX__VALUE);
1466 /* Deleting the name of a subroutine invalidates method cache */
1467 PL_sub_generation++;
1469 if (--gp->gp_refcnt > 0) {
1470 if (gp->gp_egv == gv)
1476 if (gp->gp_file_hek)
1477 unshare_hek(gp->gp_file_hek);
1478 SvREFCNT_dec(gp->gp_sv);
1479 SvREFCNT_dec(gp->gp_av);
1480 /* FIXME - another reference loop GV -> symtab -> GV ?
1481 Somehow gp->gp_hv can end up pointing at freed garbage. */
1482 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1483 const char *hvname = HvNAME_get(gp->gp_hv);
1484 if (PL_stashcache && hvname)
1485 hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv),
1487 SvREFCNT_dec(gp->gp_hv);
1489 SvREFCNT_dec(gp->gp_io);
1490 SvREFCNT_dec(gp->gp_cv);
1491 SvREFCNT_dec(gp->gp_form);
1498 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1500 AMT * const amtp = (AMT*)mg->mg_ptr;
1501 PERL_UNUSED_ARG(sv);
1503 if (amtp && AMT_AMAGIC(amtp)) {
1505 for (i = 1; i < NofAMmeth; i++) {
1506 CV * const cv = amtp->table[i];
1508 SvREFCNT_dec((SV *) cv);
1509 amtp->table[i] = NULL;
1516 /* Updates and caches the CV's */
1519 Perl_Gv_AMupdate(pTHX_ HV *stash)
1522 MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1526 const AMT * const amtp = (AMT*)mg->mg_ptr;
1527 if (amtp->was_ok_am == PL_amagic_generation
1528 && amtp->was_ok_sub == PL_sub_generation) {
1529 return (bool)AMT_OVERLOADED(amtp);
1531 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1534 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1537 amt.was_ok_am = PL_amagic_generation;
1538 amt.was_ok_sub = PL_sub_generation;
1539 amt.fallback = AMGfallNO;
1543 int filled = 0, have_ovl = 0;
1546 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1548 /* Try to find via inheritance. */
1549 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1550 SV * const sv = gv ? GvSV(gv) : NULL;
1554 lim = DESTROY_amg; /* Skip overloading entries. */
1555 #ifdef PERL_DONT_CREATE_GVSV
1557 NOOP; /* Equivalent to !SvTRUE and !SvOK */
1560 else if (SvTRUE(sv))
1561 amt.fallback=AMGfallYES;
1563 amt.fallback=AMGfallNEVER;
1565 for (i = 1; i < lim; i++)
1566 amt.table[i] = NULL;
1567 for (; i < NofAMmeth; i++) {
1568 const char * const cooky = PL_AMG_names[i];
1569 /* Human-readable form, for debugging: */
1570 const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1571 const STRLEN l = strlen(cooky);
1573 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1574 cp, HvNAME_get(stash)) );
1575 /* don't fill the cache while looking up!
1576 Creation of inheritance stubs in intermediate packages may
1577 conflict with the logic of runtime method substitution.
1578 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1579 then we could have created stubs for "(+0" in A and C too.
1580 But if B overloads "bool", we may want to use it for
1581 numifying instead of C's "+0". */
1582 if (i >= DESTROY_amg)
1583 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1584 else /* Autoload taken care of below */
1585 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1587 if (gv && (cv = GvCV(gv))) {
1589 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1590 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1591 /* This is a hack to support autoloading..., while
1592 knowing *which* methods were declared as overloaded. */
1593 /* GvSV contains the name of the method. */
1595 SV *gvsv = GvSV(gv);
1597 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1598 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1599 (void*)GvSV(gv), cp, hvname) );
1600 if (!gvsv || !SvPOK(gvsv)
1601 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1604 /* Can be an import stub (created by "can"). */
1605 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1606 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1607 "in package \"%.256s\"",
1608 (GvCVGEN(gv) ? "Stub found while resolving"
1612 cv = GvCV(gv = ngv);
1614 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1615 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1616 GvNAME(CvGV(cv))) );
1618 if (i < DESTROY_amg)
1620 } else if (gv) { /* Autoloaded... */
1624 amt.table[i]=(CV*)SvREFCNT_inc_simple(cv);
1627 AMT_AMAGIC_on(&amt);
1629 AMT_OVERLOADED_on(&amt);
1630 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1631 (char*)&amt, sizeof(AMT));
1635 /* Here we have no table: */
1637 AMT_AMAGIC_off(&amt);
1638 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1639 (char*)&amt, sizeof(AMTS));
1645 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1651 if (!stash || !HvNAME_get(stash))
1653 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1657 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1660 amtp = (AMT*)mg->mg_ptr;
1661 if ( amtp->was_ok_am != PL_amagic_generation
1662 || amtp->was_ok_sub != PL_sub_generation )
1664 if (AMT_AMAGIC(amtp)) {
1665 CV * const ret = amtp->table[id];
1666 if (ret && isGV(ret)) { /* Autoloading stab */
1667 /* Passing it through may have resulted in a warning
1668 "Inherited AUTOLOAD for a non-method deprecated", since
1669 our caller is going through a function call, not a method call.
1670 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1671 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1684 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1689 CV **cvp=NULL, **ocvp=NULL;
1690 AMT *amtp=NULL, *oamtp=NULL;
1691 int off = 0, off1, lr = 0, notfound = 0;
1692 int postpr = 0, force_cpy = 0;
1693 int assign = AMGf_assign & flags;
1694 const int assignshift = assign ? 1 : 0;
1699 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1700 && (stash = SvSTASH(SvRV(left)))
1701 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1702 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1703 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1705 && ((cv = cvp[off=method+assignshift])
1706 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1712 cv = cvp[off=method])))) {
1713 lr = -1; /* Call method for left argument */
1715 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1718 /* look for substituted methods */
1719 /* In all the covered cases we should be called with assign==0. */
1723 if ((cv = cvp[off=add_ass_amg])
1724 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1725 right = &PL_sv_yes; lr = -1; assign = 1;
1730 if ((cv = cvp[off = subtr_ass_amg])
1731 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1732 right = &PL_sv_yes; lr = -1; assign = 1;
1736 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1739 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1742 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1745 (void)((cv = cvp[off=bool__amg])
1746 || (cv = cvp[off=numer_amg])
1747 || (cv = cvp[off=string_amg]));
1753 * SV* ref causes confusion with the interpreter variable of
1756 SV* const tmpRef=SvRV(left);
1757 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1759 * Just to be extra cautious. Maybe in some
1760 * additional cases sv_setsv is safe, too.
1762 SV* const newref = newSVsv(tmpRef);
1763 SvOBJECT_on(newref);
1764 /* As a bit of a source compatibility hack, SvAMAGIC() and
1765 friends dereference an RV, to behave the same was as when
1766 overloading was stored on the reference, not the referant.
1767 Hence we can't use SvAMAGIC_on()
1769 SvFLAGS(newref) |= SVf_AMAGIC;
1770 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1776 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1777 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1778 SV* const nullsv=sv_2mortal(newSViv(0));
1780 SV* const lessp = amagic_call(left,nullsv,
1781 lt_amg,AMGf_noright);
1782 logic = SvTRUE(lessp);
1784 SV* const lessp = amagic_call(left,nullsv,
1785 ncmp_amg,AMGf_noright);
1786 logic = (SvNV(lessp) < 0);
1789 if (off==subtr_amg) {
1800 if ((cv = cvp[off=subtr_amg])) {
1802 left = sv_2mortal(newSViv(0));
1807 case iter_amg: /* XXXX Eventually should do to_gv. */
1809 return NULL; /* Delegate operation to standard mechanisms. */
1817 return left; /* Delegate operation to standard mechanisms. */
1822 if (!cv) goto not_found;
1823 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1824 && (stash = SvSTASH(SvRV(right)))
1825 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1826 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1827 ? (amtp = (AMT*)mg->mg_ptr)->table
1829 && (cv = cvp[off=method])) { /* Method for right
1832 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1833 && (cvp=ocvp) && (lr = -1))
1834 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1835 && !(flags & AMGf_unary)) {
1836 /* We look for substitution for
1837 * comparison operations and
1839 if (method==concat_amg || method==concat_ass_amg
1840 || method==repeat_amg || method==repeat_ass_amg) {
1841 return NULL; /* Delegate operation to string conversion */
1851 postpr = 1; off=ncmp_amg; break;
1858 postpr = 1; off=scmp_amg; break;
1860 if (off != -1) cv = cvp[off];
1865 not_found: /* No method found, either report or croak */
1873 return left; /* Delegate operation to standard mechanisms. */
1876 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1877 notfound = 1; lr = -1;
1878 } else if (cvp && (cv=cvp[nomethod_amg])) {
1879 notfound = 1; lr = 1;
1880 } else if ((amtp && amtp->fallback >= AMGfallYES) && !DEBUG_o_TEST) {
1881 /* Skip generating the "no method found" message. */
1885 if (off==-1) off=method;
1886 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1887 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1888 AMG_id2name(method + assignshift),
1889 (flags & AMGf_unary ? " " : "\n\tleft "),
1891 "in overloaded package ":
1892 "has no overloaded magic",
1894 HvNAME_get(SvSTASH(SvRV(left))):
1897 ",\n\tright argument in overloaded package ":
1900 : ",\n\tright argument has no overloaded magic"),
1902 HvNAME_get(SvSTASH(SvRV(right))):
1904 if (amtp && amtp->fallback >= AMGfallYES) {
1905 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1907 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
1911 force_cpy = force_cpy || assign;
1916 DEBUG_o(Perl_deb(aTHX_
1917 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1919 method+assignshift==off? "" :
1921 method+assignshift==off? "" :
1922 AMG_id2name(method+assignshift),
1923 method+assignshift==off? "" : "\")",
1924 flags & AMGf_unary? "" :
1925 lr==1 ? " for right argument": " for left argument",
1926 flags & AMGf_unary? " for argument" : "",
1927 stash ? HvNAME_get(stash) : "null",
1928 fl? ",\n\tassignment variant used": "") );
1931 /* Since we use shallow copy during assignment, we need
1932 * to dublicate the contents, probably calling user-supplied
1933 * version of copy operator
1935 /* We need to copy in following cases:
1936 * a) Assignment form was called.
1937 * assignshift==1, assign==T, method + 1 == off
1938 * b) Increment or decrement, called directly.
1939 * assignshift==0, assign==0, method + 0 == off
1940 * c) Increment or decrement, translated to assignment add/subtr.
1941 * assignshift==0, assign==T,
1943 * d) Increment or decrement, translated to nomethod.
1944 * assignshift==0, assign==0,
1946 * e) Assignment form translated to nomethod.
1947 * assignshift==1, assign==T, method + 1 != off
1950 /* off is method, method+assignshift, or a result of opcode substitution.
1951 * In the latter case assignshift==0, so only notfound case is important.
1953 if (( (method + assignshift == off)
1954 && (assign || (method == inc_amg) || (method == dec_amg)))
1961 const bool oldcatch = CATCH_GET;
1964 Zero(&myop, 1, BINOP);
1965 myop.op_last = (OP *) &myop;
1966 myop.op_next = NULL;
1967 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1969 PUSHSTACKi(PERLSI_OVERLOAD);
1972 PL_op = (OP *) &myop;
1973 if (PERLDB_SUB && PL_curstash != PL_debstash)
1974 PL_op->op_private |= OPpENTERSUB_DB;
1978 EXTEND(SP, notfound + 5);
1979 PUSHs(lr>0? right: left);
1980 PUSHs(lr>0? left: right);
1981 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1983 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1988 if ((PL_op = Perl_pp_entersub(aTHX)))
1996 CATCH_SET(oldcatch);
2003 ans=SvIV(res)<=0; break;
2006 ans=SvIV(res)<0; break;
2009 ans=SvIV(res)>=0; break;
2012 ans=SvIV(res)>0; break;
2015 ans=SvIV(res)==0; break;
2018 ans=SvIV(res)!=0; break;
2021 SvSetSV(left,res); return left;
2023 ans=!SvTRUE(res); break;
2028 } else if (method==copy_amg) {
2030 Perl_croak(aTHX_ "Copy method did not return a reference");
2032 return SvREFCNT_inc(SvRV(res));
2040 =for apidoc is_gv_magical_sv
2042 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
2048 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
2051 const char * const temp = SvPV_const(name, len);
2052 return is_gv_magical(temp, len, flags);
2056 =for apidoc is_gv_magical
2058 Returns C<TRUE> if given the name of a magical GV.
2060 Currently only useful internally when determining if a GV should be
2061 created even in rvalue contexts.
2063 C<flags> is not used at present but available for future extension to
2064 allow selecting particular classes of magical variable.
2066 Currently assumes that C<name> is NUL terminated (as well as len being valid).
2067 This assumption is met by all callers within the perl core, which all pass
2068 pointers returned by SvPV.
2073 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
2075 PERL_UNUSED_CONTEXT;
2076 PERL_UNUSED_ARG(flags);
2079 const char * const name1 = name + 1;
2082 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
2086 if (len == 8 && strEQ(name1, "VERLOAD"))
2090 if (len == 3 && name[1] == 'I' && name[2] == 'G')
2093 /* Using ${^...} variables is likely to be sufficiently rare that
2094 it seems sensible to avoid the space hit of also checking the
2096 case '\017': /* ${^OPEN} */
2097 if (strEQ(name1, "PEN"))
2100 case '\024': /* ${^TAINT} */
2101 if (strEQ(name1, "AINT"))
2104 case '\025': /* ${^UNICODE} */
2105 if (strEQ(name1, "NICODE"))
2107 if (strEQ(name1, "TF8LOCALE"))
2110 case '\027': /* ${^WARNING_BITS} */
2111 if (strEQ(name1, "ARNING_BITS"))
2124 const char *end = name + len;
2125 while (--end > name) {
2133 /* Because we're already assuming that name is NUL terminated
2134 below, we can treat an empty name as "\0" */
2161 case '\001': /* $^A */
2162 case '\003': /* $^C */
2163 case '\004': /* $^D */
2164 case '\005': /* $^E */
2165 case '\006': /* $^F */
2166 case '\010': /* $^H */
2167 case '\011': /* $^I, NOT \t in EBCDIC */
2168 case '\014': /* $^L */
2169 case '\016': /* $^N */
2170 case '\017': /* $^O */
2171 case '\020': /* $^P */
2172 case '\023': /* $^S */
2173 case '\024': /* $^T */
2174 case '\026': /* $^V */
2175 case '\027': /* $^W */
2195 Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
2201 PERL_UNUSED_ARG(flags);
2204 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
2206 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
2207 unshare_hek(GvNAME_HEK(gv));
2210 PERL_HASH(hash, name, len);
2211 GvNAME_HEK(gv) = share_hek(name, len, hash);
2216 * c-indentation-style: bsd
2218 * indent-tabs-mode: t
2221 * ex: set ts=8 sts=4 sw=4 noet: