3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 * 2000, 2001, 2002, 2003, 2004, 2005, 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 $foo, @foo, %foo.
27 GVs are usually found as values in stashes (symbol table hashes) where
28 Perl stores its global variables.
37 static const char S_autoload[] = "AUTOLOAD";
38 static const STRLEN S_autolen = sizeof(S_autoload)-1;
41 #ifdef PERL_DONT_CREATE_GVSV
43 Perl_gv_SVadd(pTHX_ GV *gv)
45 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
46 Perl_croak(aTHX_ "Bad symbol for scalar");
48 GvSV(gv) = NEWSV(72,0);
54 Perl_gv_AVadd(pTHX_ register GV *gv)
56 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
57 Perl_croak(aTHX_ "Bad symbol for array");
64 Perl_gv_HVadd(pTHX_ register GV *gv)
66 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
67 Perl_croak(aTHX_ "Bad symbol for hash");
74 Perl_gv_IOadd(pTHX_ register GV *gv)
76 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
77 Perl_croak(aTHX_ "Bad symbol for filehandle");
79 #ifdef GV_UNIQUE_CHECK
81 Perl_croak(aTHX_ "Bad symbol for filehandle (GV is unique)");
90 Perl_gv_fetchfile(pTHX_ const char *name)
100 tmplen = strlen(name) + 2;
101 if (tmplen < sizeof smallbuf)
104 Newx(tmpbuf, tmplen + 1, char);
105 /* This is where the debugger's %{"::_<$filename"} hash is created */
108 memcpy(tmpbuf + 2, name, tmplen - 1);
109 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
111 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
112 #ifdef PERL_DONT_CREATE_GVSV
113 GvSV(gv) = newSVpvn(name, tmplen - 2);
115 sv_setpvn(GvSV(gv), name, tmplen - 2);
118 hv_magic(GvHVn(gv_AVadd(gv)), Nullgv, PERL_MAGIC_dbfile);
120 if (tmpbuf != smallbuf)
126 =for apidoc gv_const_sv
128 If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
129 inlining, or C<gv> is a placeholder reference that would be promoted to such
130 a typeglob, then returns the value returned by the sub. Otherwise, returns
137 Perl_gv_const_sv(pTHX_ GV *gv)
139 if (SvTYPE(gv) == SVt_PVGV)
140 return cv_const_sv(GvCVu(gv));
141 return SvROK(gv) ? SvRV(gv) : NULL;
145 Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
149 const bool doproto = SvTYPE(gv) > SVt_NULL;
150 const char * const proto = (doproto && SvPOK(gv)) ? SvPVX_const(gv) : NULL;
151 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
153 assert (!(proto && has_constant));
156 /* The constant has to be a simple scalar type. */
157 switch (SvTYPE(has_constant)) {
163 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
164 sv_reftype(has_constant, 0));
170 sv_upgrade((SV*)gv, SVt_PVGV);
177 Safefree(SvPVX_mutable(gv));
180 GvGP(gv) = gp_ref(gp);
181 #ifdef PERL_DONT_CREATE_GVSV
184 GvSV(gv) = NEWSV(72,0);
186 GvLINE(gv) = CopLINE(PL_curcop);
187 /* XXX Ideally this cast would be replaced with a change to const char*
189 GvFILE(gv) = CopFILE(PL_curcop) ? CopFILE(PL_curcop) : (char *) "";
192 sv_magic((SV*)gv, (SV*)gv, PERL_MAGIC_glob, Nullch, 0);
195 Perl_sv_add_backref(aTHX_ (SV*)stash, (SV*)gv);
196 GvNAME(gv) = savepvn(name, len);
198 if (multi || doproto) /* doproto means it _was_ mentioned */
200 if (doproto) { /* Replicate part of newSUB here. */
204 /* newCONSTSUB takes ownership of the reference from us. */
205 GvCV(gv) = newCONSTSUB(stash, name, has_constant);
207 /* XXX unsafe for threads if eval_owner isn't held */
208 (void) start_subparse(0,0); /* Create empty CV in compcv. */
209 GvCV(gv) = PL_compcv;
215 CvFILE_set_from_cop(GvCV(gv), PL_curcop);
216 CvSTASH(GvCV(gv)) = PL_curstash;
218 sv_setpv((SV*)GvCV(gv), proto);
225 S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
237 #ifdef PERL_DONT_CREATE_GVSV
249 =for apidoc gv_fetchmeth
251 Returns the glob with the given C<name> and a defined subroutine or
252 C<NULL>. The glob lives in the given C<stash>, or in the stashes
253 accessible via @ISA and UNIVERSAL::.
255 The argument C<level> should be either 0 or -1. If C<level==0>, as a
256 side-effect creates a glob with the given C<name> in the given C<stash>
257 which in the case of success contains an alias for the subroutine, and sets
258 up caching info for this glob. Similarly for all the searched stashes.
260 This function grants C<"SUPER"> token as a postfix of the stash name. The
261 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
262 visible to Perl code. So when calling C<call_sv>, you should not use
263 the GV directly; instead, you should use the method's CV, which can be
264 obtained from the GV with the C<GvCV> macro.
270 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
279 /* UNIVERSAL methods should be callable without a stash */
281 level = -1; /* probably appropriate */
282 if(!(stash = gv_stashpvn("UNIVERSAL", 9, FALSE)))
286 hvname = HvNAME_get(stash);
289 "Can't use anonymous symbol table for method lookup");
291 if ((level > 100) || (level < -100))
292 Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
295 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
297 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
302 if (SvTYPE(topgv) != SVt_PVGV)
303 gv_init(topgv, stash, name, len, TRUE);
304 if ((cv = GvCV(topgv))) {
305 /* If genuine method or valid cache entry, use it */
306 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
308 /* Stale cached entry: junk it */
310 GvCV(topgv) = cv = Nullcv;
313 else if (GvCVGEN(topgv) == PL_sub_generation)
314 return 0; /* cache indicates sub doesn't exist */
317 gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE);
318 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : NULL;
320 /* create and re-create @.*::SUPER::ISA on demand */
321 if (!av || !SvMAGIC(av)) {
322 STRLEN packlen = HvNAMELEN_get(stash);
324 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
328 basestash = gv_stashpvn(hvname, packlen, TRUE);
329 gvp = (GV**)hv_fetch(basestash, "ISA", 3, FALSE);
330 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
331 gvp = (GV**)hv_fetch(stash, "ISA", 3, TRUE);
332 if (!gvp || !(gv = *gvp))
333 Perl_croak(aTHX_ "Cannot create %s::ISA", hvname);
334 if (SvTYPE(gv) != SVt_PVGV)
335 gv_init(gv, stash, "ISA", 3, TRUE);
336 SvREFCNT_dec(GvAV(gv));
337 GvAV(gv) = (AV*)SvREFCNT_inc(av);
343 SV** svp = AvARRAY(av);
344 /* NOTE: No support for tied ISA */
345 I32 items = AvFILLp(av) + 1;
347 SV* const sv = *svp++;
348 HV* const basestash = gv_stashsv(sv, FALSE);
350 if (ckWARN(WARN_MISC))
351 Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
355 gv = gv_fetchmeth(basestash, name, len,
356 (level >= 0) ? level + 1 : level - 1);
362 /* if at top level, try UNIVERSAL */
364 if (level == 0 || level == -1) {
365 HV* const lastchance = gv_stashpvn("UNIVERSAL", 9, FALSE);
368 if ((gv = gv_fetchmeth(lastchance, name, len,
369 (level >= 0) ? level + 1 : level - 1)))
373 * Cache method in topgv if:
374 * 1. topgv has no synonyms (else inheritance crosses wires)
375 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
378 GvREFCNT(topgv) == 1 &&
380 (CvROOT(cv) || CvXSUB(cv)))
382 if ((cv = GvCV(topgv)))
384 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
385 GvCVGEN(topgv) = PL_sub_generation;
389 else if (topgv && GvREFCNT(topgv) == 1) {
390 /* cache the fact that the method is not defined */
391 GvCVGEN(topgv) = PL_sub_generation;
400 =for apidoc gv_fetchmeth_autoload
402 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
403 Returns a glob for the subroutine.
405 For an autoloaded subroutine without a GV, will create a GV even
406 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
407 of the result may be zero.
413 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
415 GV *gv = gv_fetchmeth(stash, name, len, level);
422 return Nullgv; /* UNIVERSAL::AUTOLOAD could cause trouble */
423 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
425 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
428 if (!(CvROOT(cv) || CvXSUB(cv)))
430 /* Have an autoload */
431 if (level < 0) /* Cannot do without a stub */
432 gv_fetchmeth(stash, name, len, 0);
433 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
442 =for apidoc gv_fetchmethod_autoload
444 Returns the glob which contains the subroutine to call to invoke the method
445 on the C<stash>. In fact in the presence of autoloading this may be the
446 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
449 The third parameter of C<gv_fetchmethod_autoload> determines whether
450 AUTOLOAD lookup is performed if the given method is not present: non-zero
451 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
452 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
453 with a non-zero C<autoload> parameter.
455 These functions grant C<"SUPER"> token as a prefix of the method name. Note
456 that if you want to keep the returned glob for a long time, you need to
457 check for it being "AUTOLOAD", since at the later time the call may load a
458 different subroutine due to $AUTOLOAD changing its value. Use the glob
459 created via a side effect to do this.
461 These functions have the same side-effects and as C<gv_fetchmeth> with
462 C<level==0>. C<name> should be writable if contains C<':'> or C<'
463 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
464 C<call_sv> apply equally to these functions.
470 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
472 register const char *nend;
473 const char *nsplit = NULL;
477 if (stash && SvTYPE(stash) < SVt_PVHV)
480 for (nend = name; *nend; nend++) {
483 else if (*nend == ':' && *(nend + 1) == ':')
487 const char * const origname = name;
491 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
492 /* ->SUPER::method should really be looked up in original stash */
493 SV *tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
494 CopSTASHPV(PL_curcop)));
495 /* __PACKAGE__::SUPER stash should be autovivified */
496 stash = gv_stashpvn(SvPVX_const(tmpstr), SvCUR(tmpstr), TRUE);
497 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
498 origname, HvNAME_get(stash), name) );
501 /* don't autovifify if ->NoSuchStash::method */
502 stash = gv_stashpvn(origname, nsplit - origname, FALSE);
504 /* however, explicit calls to Pkg::SUPER::method may
505 happen, and may require autovivification to work */
506 if (!stash && (nsplit - origname) >= 7 &&
507 strnEQ(nsplit - 7, "::SUPER", 7) &&
508 gv_stashpvn(origname, nsplit - origname - 7, FALSE))
509 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
514 gv = gv_fetchmeth(stash, name, nend - name, 0);
516 if (strEQ(name,"import") || strEQ(name,"unimport"))
517 gv = (GV*)&PL_sv_yes;
519 gv = gv_autoload4(ostash, name, nend - name, TRUE);
522 CV* const cv = GvCV(gv);
523 if (!CvROOT(cv) && !CvXSUB(cv)) {
531 if (GvCV(stubgv) != cv) /* orphaned import */
534 autogv = gv_autoload4(GvSTASH(stubgv),
535 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
545 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
553 const char *packname = "";
556 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
559 if (SvTYPE(stash) < SVt_PVHV) {
560 packname = SvPV_const((SV*)stash, packname_len);
564 packname = HvNAME_get(stash);
565 packname_len = HvNAMELEN_get(stash);
568 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
572 if (!(CvROOT(cv) || CvXSUB(cv)))
576 * Inheriting AUTOLOAD for non-methods works ... for now.
578 if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
579 && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)
581 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
582 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
583 packname, (int)len, name);
586 /* rather than lookup/init $AUTOLOAD here
587 * only to have the XSUB do another lookup for $AUTOLOAD
588 * and split that value on the last '::',
589 * pass along the same data via some unused fields in the CV
592 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
598 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
599 * The subroutine's original name may not be "AUTOLOAD", so we don't
600 * use that, but for lack of anything better we will use the sub's
601 * original package to look up $AUTOLOAD.
603 varstash = GvSTASH(CvGV(cv));
604 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
608 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
609 #ifdef PERL_DONT_CREATE_GVSV
610 GvSV(vargv) = NEWSV(72,0);
614 varsv = GvSVn(vargv);
615 sv_setpvn(varsv, packname, packname_len);
616 sv_catpvn(varsv, "::", 2);
617 sv_catpvn(varsv, name, len);
618 SvTAINTED_off(varsv);
622 /* The "gv" parameter should be the glob known to Perl code as *!
623 * The scalar must already have been magicalized.
626 S_require_errno(pTHX_ GV *gv)
629 HV* stash = gv_stashpvn("Errno",5,FALSE);
631 if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
635 save_scalar(gv); /* keep the value of $! */
636 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
637 newSVpvn("Errno",5), Nullsv);
640 stash = gv_stashpvn("Errno",5,FALSE);
641 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
642 Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available");
647 =for apidoc gv_stashpv
649 Returns a pointer to the stash for a specified package. C<name> should
650 be a valid UTF-8 string and must be null-terminated. If C<create> is set
651 then the package will be created if it does not already exist. If C<create>
652 is not set and the package does not exist then NULL is returned.
658 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
660 return gv_stashpvn(name, strlen(name), create);
664 =for apidoc gv_stashpvn
666 Returns a pointer to the stash for a specified package. C<name> should
667 be a valid UTF-8 string. The C<namelen> parameter indicates the length of
668 the C<name>, in bytes. If C<create> is set then the package will be
669 created if it does not already exist. If C<create> is not set and the
670 package does not exist then NULL is returned.
676 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
683 if (namelen + 3 < sizeof smallbuf)
686 Newx(tmpbuf, namelen + 3, char);
687 Copy(name,tmpbuf,namelen,char);
688 tmpbuf[namelen++] = ':';
689 tmpbuf[namelen++] = ':';
690 tmpbuf[namelen] = '\0';
691 tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV);
692 if (tmpbuf != smallbuf)
697 GvHV(tmpgv) = newHV();
699 if (!HvNAME_get(stash))
700 hv_name_set(stash, name, namelen, 0);
705 =for apidoc gv_stashsv
707 Returns a pointer to the stash for a specified package, which must be a
708 valid UTF-8 string. See C<gv_stashpv>.
714 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
717 const char * const ptr = SvPV_const(sv,len);
718 return gv_stashpvn(ptr, len, create);
723 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
724 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
728 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
730 const char * const nambeg = SvPV_const(name, len);
731 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
735 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
738 register const char *name = nambeg;
739 register GV *gv = NULL;
742 register const char *namend;
744 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
745 const I32 no_expand = flags & GV_NOEXPAND;
746 const I32 add = flags & ~SVf_UTF8 & ~GV_NOADD_NOINIT & ~GV_NOEXPAND;
748 PERL_UNUSED_ARG(full_len);
750 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
753 for (namend = name; *namend; namend++) {
754 if ((*namend == ':' && namend[1] == ':')
755 || (*namend == '\'' && namend[1]))
759 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
767 if (len + 3 < sizeof (smallbuf))
770 Newx(tmpbuf, len+3, char);
771 Copy(name, tmpbuf, len, char);
775 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
776 gv = gvp ? *gvp : Nullgv;
777 if (gv && gv != (GV*)&PL_sv_undef) {
778 if (SvTYPE(gv) != SVt_PVGV)
779 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
783 if (tmpbuf != smallbuf)
785 if (!gv || gv == (GV*)&PL_sv_undef)
788 if (!(stash = GvHV(gv)))
789 stash = GvHV(gv) = newHV();
791 if (!HvNAME_get(stash))
792 hv_name_set(stash, nambeg, namend - nambeg, 0);
800 return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE);
805 /* No stash in name, so see how we can default */
808 if (isIDFIRST_lazy(name)) {
811 /* name is always \0 terminated, and initial \0 wouldn't return
812 true from isIDFIRST_lazy, so we know that name[1] is defined */
819 if (strEQ(name, "INC") || strEQ(name, "ENV"))
823 if (strEQ(name, "SIG"))
827 if (strEQ(name, "STDIN") || strEQ(name, "STDOUT") ||
828 strEQ(name, "STDERR"))
832 if (strEQ(name, "ARGV") || strEQ(name, "ARGVOUT"))
839 else if (IN_PERL_COMPILETIME) {
841 if (add && (PL_hints & HINT_STRICT_VARS) &&
842 sv_type != SVt_PVCV &&
843 sv_type != SVt_PVGV &&
844 sv_type != SVt_PVFM &&
845 sv_type != SVt_PVIO &&
846 !(len == 1 && sv_type == SVt_PV &&
847 (*name == 'a' || *name == 'b')) )
849 gvp = (GV**)hv_fetch(stash,name,len,0);
851 *gvp == (GV*)&PL_sv_undef ||
852 SvTYPE(*gvp) != SVt_PVGV)
856 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
857 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
858 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
860 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
861 sv_type == SVt_PVAV ? '@' :
862 sv_type == SVt_PVHV ? '%' : '$',
865 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
871 stash = CopSTASH(PL_curcop);
877 /* By this point we should have a stash and a name */
881 SV * const err = Perl_mess(aTHX_
882 "Global symbol \"%s%s\" requires explicit package name",
883 (sv_type == SVt_PV ? "$"
884 : sv_type == SVt_PVAV ? "@"
885 : sv_type == SVt_PVHV ? "%"
887 if (USE_UTF8_IN_NAMES)
890 stash = GvHV(gv_fetchpv("<none>::", GV_ADDMULTI, SVt_PVHV));
896 if (!SvREFCNT(stash)) /* symbol table under destruction */
899 gvp = (GV**)hv_fetch(stash,name,len,add);
900 if (!gvp || *gvp == (GV*)&PL_sv_undef)
903 if (SvTYPE(gv) == SVt_PVGV) {
906 gv_init_sv(gv, sv_type);
907 if (*name=='!' && sv_type == SVt_PVHV && len==1)
911 } else if (no_init) {
913 } else if (no_expand && SvROK(gv)) {
917 /* Adding a new symbol */
919 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
920 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
921 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
922 gv_init_sv(gv, sv_type);
924 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
925 : (PL_dowarn & G_WARN_ON ) ) )
928 /* set up magic where warranted */
932 /* Nothing else to do.
933 The compiler will probably turn the switch statement into a
934 branch table. Make sure we avoid even that small overhead for
935 the common case of lower case variable names. */
939 const char * const name2 = name + 1;
942 if (strEQ(name2, "RGV")) {
943 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
947 if (strnEQ(name2, "XPORT", 5))
951 if (strEQ(name2, "SA")) {
952 AV* const av = GvAVn(gv);
954 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, Nullch, 0);
955 /* NOTE: No support for tied ISA */
956 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
957 && AvFILLp(av) == -1)
960 av_push(av, newSVpvn(pname = "NDBM_File",9));
961 gv_stashpvn(pname, 9, TRUE);
962 av_push(av, newSVpvn(pname = "DB_File",7));
963 gv_stashpvn(pname, 7, TRUE);
964 av_push(av, newSVpvn(pname = "GDBM_File",9));
965 gv_stashpvn(pname, 9, TRUE);
966 av_push(av, newSVpvn(pname = "SDBM_File",9));
967 gv_stashpvn(pname, 9, TRUE);
968 av_push(av, newSVpvn(pname = "ODBM_File",9));
969 gv_stashpvn(pname, 9, TRUE);
974 if (strEQ(name2, "VERLOAD")) {
975 HV* const hv = GvHVn(gv);
977 hv_magic(hv, Nullgv, PERL_MAGIC_overload);
981 if (strEQ(name2, "IG")) {
985 Newxz(PL_psig_ptr, SIG_SIZE, SV*);
986 Newxz(PL_psig_name, SIG_SIZE, SV*);
987 Newxz(PL_psig_pend, SIG_SIZE, int);
991 hv_magic(hv, Nullgv, PERL_MAGIC_sig);
992 for (i = 1; i < SIG_SIZE; i++) {
993 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
995 sv_setsv(*init, &PL_sv_undef);
1003 if (strEQ(name2, "ERSION"))
1006 case '\003': /* $^CHILD_ERROR_NATIVE */
1007 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1010 case '\005': /* $^ENCODING */
1011 if (strEQ(name2, "NCODING"))
1014 case '\017': /* $^OPEN */
1015 if (strEQ(name2, "PEN"))
1018 case '\024': /* ${^TAINT} */
1019 if (strEQ(name2, "AINT"))
1022 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1023 if (strEQ(name2, "NICODE"))
1025 if (strEQ(name2, "TF8LOCALE"))
1028 case '\027': /* $^WARNING_BITS */
1029 if (strEQ(name2, "ARNING_BITS"))
1042 /* ensures variable is only digits */
1043 /* ${"1foo"} fails this test (and is thus writeable) */
1044 /* added by japhy, but borrowed from is_gv_magical */
1045 const char *end = name + len;
1046 while (--end > name) {
1047 if (!isDIGIT(*end)) return gv;
1054 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1055 be case '\0' in this switch statement (ie a default case) */
1061 sv_type == SVt_PVAV ||
1062 sv_type == SVt_PVHV ||
1063 sv_type == SVt_PVCV ||
1064 sv_type == SVt_PVFM ||
1067 PL_sawampersand = TRUE;
1071 sv_setpv(GvSVn(gv),PL_chopset);
1075 #ifdef COMPLEX_STATUS
1076 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1082 /* If %! has been used, automatically load Errno.pm.
1083 The require will itself set errno, so in order to
1084 preserve its value we have to set up the magic
1085 now (rather than going to magicalize)
1088 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1090 if (sv_type == SVt_PVHV)
1096 AV* const av = GvAVn(gv);
1097 sv_magic((SV*)av, Nullsv, PERL_MAGIC_regdata, Nullch, 0);
1103 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1104 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1105 "$%c is no longer supported", *name);
1108 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1113 AV* const av = GvAVn(gv);
1114 sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, Nullch, 0);
1118 case '\023': /* $^S */
1129 SvREADONLY_on(GvSVn(gv));
1144 case '\001': /* $^A */
1145 case '\003': /* $^C */
1146 case '\004': /* $^D */
1147 case '\005': /* $^E */
1148 case '\006': /* $^F */
1149 case '\010': /* $^H */
1150 case '\011': /* $^I, NOT \t in EBCDIC */
1151 case '\016': /* $^N */
1152 case '\017': /* $^O */
1153 case '\020': /* $^P */
1154 case '\024': /* $^T */
1155 case '\027': /* $^W */
1157 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1160 case '\014': /* $^L */
1161 sv_setpvn(GvSVn(gv),"\f",1);
1162 PL_formfeed = GvSVn(gv);
1165 sv_setpvn(GvSVn(gv),"\034",1);
1169 SV * const sv = GvSVn(gv);
1170 if (!sv_derived_from(PL_patchlevel, "version"))
1171 (void *)upg_version(PL_patchlevel);
1172 GvSV(gv) = vnumify(PL_patchlevel);
1173 SvREADONLY_on(GvSV(gv));
1177 case '\026': /* $^V */
1179 SV * const sv = GvSVn(gv);
1180 GvSV(gv) = new_version(PL_patchlevel);
1181 SvREADONLY_on(GvSV(gv));
1191 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1195 const HV * const hv = GvSTASH(gv);
1200 sv_setpv(sv, prefix ? prefix : "");
1202 name = HvNAME_get(hv);
1204 namelen = HvNAMELEN_get(hv);
1210 if (keepmain || strNE(name, "main")) {
1211 sv_catpvn(sv,name,namelen);
1212 sv_catpvn(sv,"::", 2);
1214 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1218 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1220 const GV * const egv = GvEGV(gv);
1221 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1228 IO * const io = (IO*)NEWSV(0,0);
1230 sv_upgrade((SV *)io,SVt_PVIO);
1231 /* This used to read SvREFCNT(io) = 1;
1232 It's not clear why the reference count needed an explicit reset. NWC
1234 assert (SvREFCNT(io) == 1);
1236 /* Clear the stashcache because a new IO could overrule a package name */
1237 hv_clear(PL_stashcache);
1238 iogv = gv_fetchpv("FileHandle::", 0, SVt_PVHV);
1239 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1240 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1241 iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV);
1242 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1247 Perl_gv_check(pTHX_ HV *stash)
1251 if (!HvARRAY(stash))
1253 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1255 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1258 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1259 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1261 if (hv != PL_defstash && hv != stash)
1262 gv_check(hv); /* nested package */
1264 else if (isALPHA(*HeKEY(entry))) {
1266 gv = (GV*)HeVAL(entry);
1267 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1270 /* performance hack: if filename is absolute and it's a standard
1271 * module, don't bother warning */
1272 #ifdef MACOS_TRADITIONAL
1273 # define LIB_COMPONENT ":lib:"
1275 # define LIB_COMPONENT "/lib/"
1278 && PERL_FILE_IS_ABSOLUTE(file)
1279 && (instr(file, LIB_COMPONENT) || instr(file, ".pm")))
1283 CopLINE_set(PL_curcop, GvLINE(gv));
1285 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1287 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1289 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1290 "Name \"%s::%s\" used only once: possible typo",
1291 HvNAME_get(stash), GvNAME(gv));
1298 Perl_newGVgen(pTHX_ const char *pack)
1300 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1304 /* hopefully this is only called on local symbol table entries */
1307 Perl_gp_ref(pTHX_ GP *gp)
1314 /* multi-named GPs cannot be used for method cache */
1315 SvREFCNT_dec(gp->gp_cv);
1320 /* Adding a new name to a subroutine invalidates method cache */
1321 PL_sub_generation++;
1328 Perl_gp_free(pTHX_ GV *gv)
1332 if (!gv || !(gp = GvGP(gv)))
1334 if (gp->gp_refcnt == 0) {
1335 if (ckWARN_d(WARN_INTERNAL))
1336 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1337 "Attempt to free unreferenced glob pointers"
1338 pTHX__FORMAT pTHX__VALUE);
1342 /* Deleting the name of a subroutine invalidates method cache */
1343 PL_sub_generation++;
1345 if (--gp->gp_refcnt > 0) {
1346 if (gp->gp_egv == gv)
1351 if (gp->gp_sv) SvREFCNT_dec(gp->gp_sv);
1352 if (gp->gp_av) SvREFCNT_dec(gp->gp_av);
1353 /* FIXME - another reference loop GV -> symtab -> GV ?
1354 Somehow gp->gp_hv can end up pointing at freed garbage. */
1355 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1356 const char *hvname = HvNAME_get(gp->gp_hv);
1357 if (PL_stashcache && hvname)
1358 hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv),
1360 SvREFCNT_dec(gp->gp_hv);
1362 if (gp->gp_io) SvREFCNT_dec(gp->gp_io);
1363 if (gp->gp_cv) SvREFCNT_dec(gp->gp_cv);
1364 if (gp->gp_form) SvREFCNT_dec(gp->gp_form);
1371 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1373 AMT * const amtp = (AMT*)mg->mg_ptr;
1374 PERL_UNUSED_ARG(sv);
1376 if (amtp && AMT_AMAGIC(amtp)) {
1378 for (i = 1; i < NofAMmeth; i++) {
1379 CV * const cv = amtp->table[i];
1381 SvREFCNT_dec((SV *) cv);
1382 amtp->table[i] = Nullcv;
1389 /* Updates and caches the CV's */
1392 Perl_Gv_AMupdate(pTHX_ HV *stash)
1394 MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1395 AMT * const amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
1398 if (mg && amtp->was_ok_am == PL_amagic_generation
1399 && amtp->was_ok_sub == PL_sub_generation)
1400 return (bool)AMT_OVERLOADED(amtp);
1401 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1403 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1406 amt.was_ok_am = PL_amagic_generation;
1407 amt.was_ok_sub = PL_sub_generation;
1408 amt.fallback = AMGfallNO;
1412 int filled = 0, have_ovl = 0;
1415 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1417 /* Try to find via inheritance. */
1418 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1419 SV * const sv = gv ? GvSV(gv) : NULL;
1423 lim = DESTROY_amg; /* Skip overloading entries. */
1424 #ifdef PERL_DONT_CREATE_GVSV
1426 /* Equivalent to !SvTRUE and !SvOK */
1429 else if (SvTRUE(sv))
1430 amt.fallback=AMGfallYES;
1432 amt.fallback=AMGfallNEVER;
1434 for (i = 1; i < lim; i++)
1435 amt.table[i] = Nullcv;
1436 for (; i < NofAMmeth; i++) {
1437 const char *cooky = PL_AMG_names[i];
1438 /* Human-readable form, for debugging: */
1439 const char *cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1440 const STRLEN l = strlen(cooky);
1442 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1443 cp, HvNAME_get(stash)) );
1444 /* don't fill the cache while looking up!
1445 Creation of inheritance stubs in intermediate packages may
1446 conflict with the logic of runtime method substitution.
1447 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1448 then we could have created stubs for "(+0" in A and C too.
1449 But if B overloads "bool", we may want to use it for
1450 numifying instead of C's "+0". */
1451 if (i >= DESTROY_amg)
1452 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1453 else /* Autoload taken care of below */
1454 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1456 if (gv && (cv = GvCV(gv))) {
1458 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1459 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1460 /* This is a hack to support autoloading..., while
1461 knowing *which* methods were declared as overloaded. */
1462 /* GvSV contains the name of the method. */
1464 SV *gvsv = GvSV(gv);
1466 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1467 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1468 GvSV(gv), cp, hvname) );
1469 if (!gvsv || !SvPOK(gvsv)
1470 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1473 /* Can be an import stub (created by "can"). */
1474 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1475 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1476 "in package \"%.256s\"",
1477 (GvCVGEN(gv) ? "Stub found while resolving"
1481 cv = GvCV(gv = ngv);
1483 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1484 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1485 GvNAME(CvGV(cv))) );
1487 if (i < DESTROY_amg)
1489 } else if (gv) { /* Autoloaded... */
1493 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1496 AMT_AMAGIC_on(&amt);
1498 AMT_OVERLOADED_on(&amt);
1499 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1500 (char*)&amt, sizeof(AMT));
1504 /* Here we have no table: */
1506 AMT_AMAGIC_off(&amt);
1507 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1508 (char*)&amt, sizeof(AMTS));
1514 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1519 if (!stash || !HvNAME_get(stash))
1521 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1525 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1527 amtp = (AMT*)mg->mg_ptr;
1528 if ( amtp->was_ok_am != PL_amagic_generation
1529 || amtp->was_ok_sub != PL_sub_generation )
1531 if (AMT_AMAGIC(amtp)) {
1532 CV * const ret = amtp->table[id];
1533 if (ret && isGV(ret)) { /* Autoloading stab */
1534 /* Passing it through may have resulted in a warning
1535 "Inherited AUTOLOAD for a non-method deprecated", since
1536 our caller is going through a function call, not a method call.
1537 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1538 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1551 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1556 CV **cvp=NULL, **ocvp=NULL;
1557 AMT *amtp=NULL, *oamtp=NULL;
1558 int off = 0, off1, lr = 0, notfound = 0;
1559 int postpr = 0, force_cpy = 0;
1560 int assign = AMGf_assign & flags;
1561 const int assignshift = assign ? 1 : 0;
1566 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1567 && (stash = SvSTASH(SvRV(left)))
1568 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1569 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1570 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1572 && ((cv = cvp[off=method+assignshift])
1573 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1579 cv = cvp[off=method])))) {
1580 lr = -1; /* Call method for left argument */
1582 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1585 /* look for substituted methods */
1586 /* In all the covered cases we should be called with assign==0. */
1590 if ((cv = cvp[off=add_ass_amg])
1591 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1592 right = &PL_sv_yes; lr = -1; assign = 1;
1597 if ((cv = cvp[off = subtr_ass_amg])
1598 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1599 right = &PL_sv_yes; lr = -1; assign = 1;
1603 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1606 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1609 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1612 (void)((cv = cvp[off=bool__amg])
1613 || (cv = cvp[off=numer_amg])
1614 || (cv = cvp[off=string_amg]));
1620 * SV* ref causes confusion with the interpreter variable of
1623 SV* const tmpRef=SvRV(left);
1624 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1626 * Just to be extra cautious. Maybe in some
1627 * additional cases sv_setsv is safe, too.
1629 SV* const newref = newSVsv(tmpRef);
1630 SvOBJECT_on(newref);
1631 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1637 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1638 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1639 SV* const nullsv=sv_2mortal(newSViv(0));
1641 SV* const lessp = amagic_call(left,nullsv,
1642 lt_amg,AMGf_noright);
1643 logic = SvTRUE(lessp);
1645 SV* const lessp = amagic_call(left,nullsv,
1646 ncmp_amg,AMGf_noright);
1647 logic = (SvNV(lessp) < 0);
1650 if (off==subtr_amg) {
1661 if ((cv = cvp[off=subtr_amg])) {
1663 left = sv_2mortal(newSViv(0));
1668 case iter_amg: /* XXXX Eventually should do to_gv. */
1670 return NULL; /* Delegate operation to standard mechanisms. */
1678 return left; /* Delegate operation to standard mechanisms. */
1683 if (!cv) goto not_found;
1684 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1685 && (stash = SvSTASH(SvRV(right)))
1686 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1687 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1688 ? (amtp = (AMT*)mg->mg_ptr)->table
1690 && (cv = cvp[off=method])) { /* Method for right
1693 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1694 && (cvp=ocvp) && (lr = -1))
1695 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1696 && !(flags & AMGf_unary)) {
1697 /* We look for substitution for
1698 * comparison operations and
1700 if (method==concat_amg || method==concat_ass_amg
1701 || method==repeat_amg || method==repeat_ass_amg) {
1702 return NULL; /* Delegate operation to string conversion */
1712 postpr = 1; off=ncmp_amg; break;
1719 postpr = 1; off=scmp_amg; break;
1721 if (off != -1) cv = cvp[off];
1726 not_found: /* No method found, either report or croak */
1734 return left; /* Delegate operation to standard mechanisms. */
1737 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1738 notfound = 1; lr = -1;
1739 } else if (cvp && (cv=cvp[nomethod_amg])) {
1740 notfound = 1; lr = 1;
1743 if (off==-1) off=method;
1744 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1745 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1746 AMG_id2name(method + assignshift),
1747 (flags & AMGf_unary ? " " : "\n\tleft "),
1749 "in overloaded package ":
1750 "has no overloaded magic",
1752 HvNAME_get(SvSTASH(SvRV(left))):
1755 ",\n\tright argument in overloaded package ":
1758 : ",\n\tright argument has no overloaded magic"),
1760 HvNAME_get(SvSTASH(SvRV(right))):
1762 if (amtp && amtp->fallback >= AMGfallYES) {
1763 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1765 Perl_croak(aTHX_ "%"SVf, msg);
1769 force_cpy = force_cpy || assign;
1774 DEBUG_o(Perl_deb(aTHX_
1775 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1777 method+assignshift==off? "" :
1779 method+assignshift==off? "" :
1780 AMG_id2name(method+assignshift),
1781 method+assignshift==off? "" : "\")",
1782 flags & AMGf_unary? "" :
1783 lr==1 ? " for right argument": " for left argument",
1784 flags & AMGf_unary? " for argument" : "",
1785 stash ? HvNAME_get(stash) : "null",
1786 fl? ",\n\tassignment variant used": "") );
1789 /* Since we use shallow copy during assignment, we need
1790 * to dublicate the contents, probably calling user-supplied
1791 * version of copy operator
1793 /* We need to copy in following cases:
1794 * a) Assignment form was called.
1795 * assignshift==1, assign==T, method + 1 == off
1796 * b) Increment or decrement, called directly.
1797 * assignshift==0, assign==0, method + 0 == off
1798 * c) Increment or decrement, translated to assignment add/subtr.
1799 * assignshift==0, assign==T,
1801 * d) Increment or decrement, translated to nomethod.
1802 * assignshift==0, assign==0,
1804 * e) Assignment form translated to nomethod.
1805 * assignshift==1, assign==T, method + 1 != off
1808 /* off is method, method+assignshift, or a result of opcode substitution.
1809 * In the latter case assignshift==0, so only notfound case is important.
1811 if (( (method + assignshift == off)
1812 && (assign || (method == inc_amg) || (method == dec_amg)))
1819 const bool oldcatch = CATCH_GET;
1822 Zero(&myop, 1, BINOP);
1823 myop.op_last = (OP *) &myop;
1824 myop.op_next = Nullop;
1825 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1827 PUSHSTACKi(PERLSI_OVERLOAD);
1830 PL_op = (OP *) &myop;
1831 if (PERLDB_SUB && PL_curstash != PL_debstash)
1832 PL_op->op_private |= OPpENTERSUB_DB;
1836 EXTEND(SP, notfound + 5);
1837 PUSHs(lr>0? right: left);
1838 PUSHs(lr>0? left: right);
1839 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1841 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1846 if ((PL_op = Perl_pp_entersub(aTHX)))
1854 CATCH_SET(oldcatch);
1861 ans=SvIV(res)<=0; break;
1864 ans=SvIV(res)<0; break;
1867 ans=SvIV(res)>=0; break;
1870 ans=SvIV(res)>0; break;
1873 ans=SvIV(res)==0; break;
1876 ans=SvIV(res)!=0; break;
1879 SvSetSV(left,res); return left;
1881 ans=!SvTRUE(res); break;
1886 } else if (method==copy_amg) {
1888 Perl_croak(aTHX_ "Copy method did not return a reference");
1890 return SvREFCNT_inc(SvRV(res));
1898 =for apidoc is_gv_magical_sv
1900 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
1906 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
1909 const char * const temp = SvPV_const(name, len);
1910 return is_gv_magical(temp, len, flags);
1914 =for apidoc is_gv_magical
1916 Returns C<TRUE> if given the name of a magical GV.
1918 Currently only useful internally when determining if a GV should be
1919 created even in rvalue contexts.
1921 C<flags> is not used at present but available for future extension to
1922 allow selecting particular classes of magical variable.
1924 Currently assumes that C<name> is NUL terminated (as well as len being valid).
1925 This assumption is met by all callers within the perl core, which all pass
1926 pointers returned by SvPV.
1931 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
1933 PERL_UNUSED_ARG(flags);
1936 const char * const name1 = name + 1;
1939 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
1943 if (len == 8 && strEQ(name1, "VERLOAD"))
1947 if (len == 3 && name[1] == 'I' && name[2] == 'G')
1950 /* Using ${^...} variables is likely to be sufficiently rare that
1951 it seems sensible to avoid the space hit of also checking the
1953 case '\017': /* ${^OPEN} */
1954 if (strEQ(name1, "PEN"))
1957 case '\024': /* ${^TAINT} */
1958 if (strEQ(name1, "AINT"))
1961 case '\025': /* ${^UNICODE} */
1962 if (strEQ(name1, "NICODE"))
1964 if (strEQ(name1, "TF8LOCALE"))
1967 case '\027': /* ${^WARNING_BITS} */
1968 if (strEQ(name1, "ARNING_BITS"))
1981 const char *end = name + len;
1982 while (--end > name) {
1990 /* Because we're already assuming that name is NUL terminated
1991 below, we can treat an empty name as "\0" */
2018 case '\001': /* $^A */
2019 case '\003': /* $^C */
2020 case '\004': /* $^D */
2021 case '\005': /* $^E */
2022 case '\006': /* $^F */
2023 case '\010': /* $^H */
2024 case '\011': /* $^I, NOT \t in EBCDIC */
2025 case '\014': /* $^L */
2026 case '\016': /* $^N */
2027 case '\017': /* $^O */
2028 case '\020': /* $^P */
2029 case '\023': /* $^S */
2030 case '\024': /* $^T */
2031 case '\026': /* $^V */
2032 case '\027': /* $^W */
2053 * c-indentation-style: bsd
2055 * indent-tabs-mode: t
2058 * ex: set ts=8 sts=4 sw=4 noet: