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 Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
130 const bool doproto = SvTYPE(gv) > SVt_NULL;
131 const char * const proto = (doproto && SvPOK(gv)) ? SvPVX_const(gv) : NULL;
133 sv_upgrade((SV*)gv, SVt_PVGV);
140 Safefree(SvPVX_mutable(gv));
143 GvGP(gv) = gp_ref(gp);
144 #ifdef PERL_DONT_CREATE_GVSV
147 GvSV(gv) = NEWSV(72,0);
149 GvLINE(gv) = CopLINE(PL_curcop);
150 /* XXX Ideally this cast would be replaced with a change to const char*
152 GvFILE(gv) = CopFILE(PL_curcop) ? CopFILE(PL_curcop) : (char *) "";
155 sv_magic((SV*)gv, (SV*)gv, PERL_MAGIC_glob, Nullch, 0);
158 Perl_sv_add_backref(aTHX_ (SV*)stash, (SV*)gv);
159 GvNAME(gv) = savepvn(name, len);
161 if (multi || doproto) /* doproto means it _was_ mentioned */
163 if (doproto) { /* Replicate part of newSUB here. */
166 /* XXX unsafe for threads if eval_owner isn't held */
167 start_subparse(0,0); /* Create CV in compcv. */
168 GvCV(gv) = PL_compcv;
173 CvFILE_set_from_cop(GvCV(gv), PL_curcop);
174 CvSTASH(GvCV(gv)) = PL_curstash;
176 sv_setpv((SV*)GvCV(gv), proto);
183 S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
195 #ifdef PERL_DONT_CREATE_GVSV
207 =for apidoc gv_fetchmeth
209 Returns the glob with the given C<name> and a defined subroutine or
210 C<NULL>. The glob lives in the given C<stash>, or in the stashes
211 accessible via @ISA and UNIVERSAL::.
213 The argument C<level> should be either 0 or -1. If C<level==0>, as a
214 side-effect creates a glob with the given C<name> in the given C<stash>
215 which in the case of success contains an alias for the subroutine, and sets
216 up caching info for this glob. Similarly for all the searched stashes.
218 This function grants C<"SUPER"> token as a postfix of the stash name. The
219 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
220 visible to Perl code. So when calling C<call_sv>, you should not use
221 the GV directly; instead, you should use the method's CV, which can be
222 obtained from the GV with the C<GvCV> macro.
228 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
237 /* UNIVERSAL methods should be callable without a stash */
239 level = -1; /* probably appropriate */
240 if(!(stash = gv_stashpvn("UNIVERSAL", 9, FALSE)))
244 hvname = HvNAME_get(stash);
247 "Can't use anonymous symbol table for method lookup");
249 if ((level > 100) || (level < -100))
250 Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
253 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
255 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
260 if (SvTYPE(topgv) != SVt_PVGV)
261 gv_init(topgv, stash, name, len, TRUE);
262 if ((cv = GvCV(topgv))) {
263 /* If genuine method or valid cache entry, use it */
264 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
266 /* Stale cached entry: junk it */
268 GvCV(topgv) = cv = Nullcv;
271 else if (GvCVGEN(topgv) == PL_sub_generation)
272 return 0; /* cache indicates sub doesn't exist */
275 gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE);
276 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : Nullav;
278 /* create and re-create @.*::SUPER::ISA on demand */
279 if (!av || !SvMAGIC(av)) {
280 STRLEN packlen = HvNAMELEN_get(stash);
282 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
286 basestash = gv_stashpvn(hvname, packlen, TRUE);
287 gvp = (GV**)hv_fetch(basestash, "ISA", 3, FALSE);
288 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
289 gvp = (GV**)hv_fetch(stash, "ISA", 3, TRUE);
290 if (!gvp || !(gv = *gvp))
291 Perl_croak(aTHX_ "Cannot create %s::ISA", hvname);
292 if (SvTYPE(gv) != SVt_PVGV)
293 gv_init(gv, stash, "ISA", 3, TRUE);
294 SvREFCNT_dec(GvAV(gv));
295 GvAV(gv) = (AV*)SvREFCNT_inc(av);
301 SV** svp = AvARRAY(av);
302 /* NOTE: No support for tied ISA */
303 I32 items = AvFILLp(av) + 1;
306 HV* basestash = gv_stashsv(sv, FALSE);
308 if (ckWARN(WARN_MISC))
309 Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
313 gv = gv_fetchmeth(basestash, name, len,
314 (level >= 0) ? level + 1 : level - 1);
320 /* if at top level, try UNIVERSAL */
322 if (level == 0 || level == -1) {
325 if ((lastchance = gv_stashpvn("UNIVERSAL", 9, FALSE))) {
326 if ((gv = gv_fetchmeth(lastchance, name, len,
327 (level >= 0) ? level + 1 : level - 1)))
331 * Cache method in topgv if:
332 * 1. topgv has no synonyms (else inheritance crosses wires)
333 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
336 GvREFCNT(topgv) == 1 &&
338 (CvROOT(cv) || CvXSUB(cv)))
340 if ((cv = GvCV(topgv)))
342 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
343 GvCVGEN(topgv) = PL_sub_generation;
347 else if (topgv && GvREFCNT(topgv) == 1) {
348 /* cache the fact that the method is not defined */
349 GvCVGEN(topgv) = PL_sub_generation;
358 =for apidoc gv_fetchmeth_autoload
360 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
361 Returns a glob for the subroutine.
363 For an autoloaded subroutine without a GV, will create a GV even
364 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
365 of the result may be zero.
371 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
373 GV *gv = gv_fetchmeth(stash, name, len, level);
380 return Nullgv; /* UNIVERSAL::AUTOLOAD could cause trouble */
381 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
383 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
386 if (!(CvROOT(cv) || CvXSUB(cv)))
388 /* Have an autoload */
389 if (level < 0) /* Cannot do without a stub */
390 gv_fetchmeth(stash, name, len, 0);
391 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
400 =for apidoc gv_fetchmethod
402 See L<gv_fetchmethod_autoload>.
408 Perl_gv_fetchmethod(pTHX_ HV *stash, const char *name)
410 return gv_fetchmethod_autoload(stash, name, TRUE);
414 =for apidoc gv_fetchmethod_autoload
416 Returns the glob which contains the subroutine to call to invoke the method
417 on the C<stash>. In fact in the presence of autoloading this may be the
418 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
421 The third parameter of C<gv_fetchmethod_autoload> determines whether
422 AUTOLOAD lookup is performed if the given method is not present: non-zero
423 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
424 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
425 with a non-zero C<autoload> parameter.
427 These functions grant C<"SUPER"> token as a prefix of the method name. Note
428 that if you want to keep the returned glob for a long time, you need to
429 check for it being "AUTOLOAD", since at the later time the call may load a
430 different subroutine due to $AUTOLOAD changing its value. Use the glob
431 created via a side effect to do this.
433 These functions have the same side-effects and as C<gv_fetchmeth> with
434 C<level==0>. C<name> should be writable if contains C<':'> or C<'
435 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
436 C<call_sv> apply equally to these functions.
442 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
444 register const char *nend;
445 const char *nsplit = 0;
449 if (stash && SvTYPE(stash) < SVt_PVHV)
452 for (nend = name; *nend; nend++) {
455 else if (*nend == ':' && *(nend + 1) == ':')
459 const char * const origname = name;
463 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
464 /* ->SUPER::method should really be looked up in original stash */
465 SV *tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
466 CopSTASHPV(PL_curcop)));
467 /* __PACKAGE__::SUPER stash should be autovivified */
468 stash = gv_stashpvn(SvPVX_const(tmpstr), SvCUR(tmpstr), TRUE);
469 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
470 origname, HvNAME_get(stash), name) );
473 /* don't autovifify if ->NoSuchStash::method */
474 stash = gv_stashpvn(origname, nsplit - origname, FALSE);
476 /* however, explicit calls to Pkg::SUPER::method may
477 happen, and may require autovivification to work */
478 if (!stash && (nsplit - origname) >= 7 &&
479 strnEQ(nsplit - 7, "::SUPER", 7) &&
480 gv_stashpvn(origname, nsplit - origname - 7, FALSE))
481 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
486 gv = gv_fetchmeth(stash, name, nend - name, 0);
488 if (strEQ(name,"import") || strEQ(name,"unimport"))
489 gv = (GV*)&PL_sv_yes;
491 gv = gv_autoload4(ostash, name, nend - name, TRUE);
494 CV* const cv = GvCV(gv);
495 if (!CvROOT(cv) && !CvXSUB(cv)) {
503 if (GvCV(stubgv) != cv) /* orphaned import */
506 autogv = gv_autoload4(GvSTASH(stubgv),
507 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
517 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
525 const char *packname = "";
528 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
531 if (SvTYPE(stash) < SVt_PVHV) {
532 packname = SvPV_const((SV*)stash, packname_len);
536 packname = HvNAME_get(stash);
537 packname_len = HvNAMELEN_get(stash);
540 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
544 if (!(CvROOT(cv) || CvXSUB(cv)))
548 * Inheriting AUTOLOAD for non-methods works ... for now.
550 if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX) && !method &&
551 (GvCVGEN(gv) || GvSTASH(gv) != stash))
552 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
553 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
554 packname, (int)len, name);
557 /* rather than lookup/init $AUTOLOAD here
558 * only to have the XSUB do another lookup for $AUTOLOAD
559 * and split that value on the last '::',
560 * pass along the same data via some unused fields in the CV
563 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
569 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
570 * The subroutine's original name may not be "AUTOLOAD", so we don't
571 * use that, but for lack of anything better we will use the sub's
572 * original package to look up $AUTOLOAD.
574 varstash = GvSTASH(CvGV(cv));
575 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
579 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
580 #ifdef PERL_DONT_CREATE_GVSV
581 GvSV(vargv) = NEWSV(72,0);
585 varsv = GvSVn(vargv);
586 sv_setpvn(varsv, packname, packname_len);
587 sv_catpvn(varsv, "::", 2);
588 sv_catpvn(varsv, name, len);
589 SvTAINTED_off(varsv);
593 /* The "gv" parameter should be the glob known to Perl code as *!
594 * The scalar must already have been magicalized.
597 S_require_errno(pTHX_ GV *gv)
600 HV* stash = gv_stashpvn("Errno",5,FALSE);
602 if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
606 save_scalar(gv); /* keep the value of $! */
607 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
608 newSVpvn("Errno",5), Nullsv);
611 stash = gv_stashpvn("Errno",5,FALSE);
612 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
613 Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available");
618 =for apidoc gv_stashpv
620 Returns a pointer to the stash for a specified package. C<name> should
621 be a valid UTF-8 string and must be null-terminated. If C<create> is set
622 then the package will be created if it does not already exist. If C<create>
623 is not set and the package does not exist then NULL is returned.
629 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
631 return gv_stashpvn(name, strlen(name), create);
635 =for apidoc gv_stashpvn
637 Returns a pointer to the stash for a specified package. C<name> should
638 be a valid UTF-8 string. The C<namelen> parameter indicates the length of
639 the C<name>, in bytes. If C<create> is set then the package will be
640 created if it does not already exist. If C<create> is not set and the
641 package does not exist then NULL is returned.
647 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
654 if (namelen + 3 < sizeof smallbuf)
657 Newx(tmpbuf, namelen + 3, char);
658 Copy(name,tmpbuf,namelen,char);
659 tmpbuf[namelen++] = ':';
660 tmpbuf[namelen++] = ':';
661 tmpbuf[namelen] = '\0';
662 tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV);
663 if (tmpbuf != smallbuf)
668 GvHV(tmpgv) = newHV();
670 if (!HvNAME_get(stash))
671 Perl_hv_name_set(aTHX_ stash, name, namelen, 0);
676 =for apidoc gv_stashsv
678 Returns a pointer to the stash for a specified package, which must be a
679 valid UTF-8 string. See C<gv_stashpv>.
685 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
688 const char * const ptr = SvPV_const(sv,len);
689 return gv_stashpvn(ptr, len, create);
694 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
695 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
699 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
701 const char * const nambeg = SvPV_const(name, len);
702 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
706 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
709 register const char *name = nambeg;
713 register const char *namend;
715 const I32 add = flags & ~SVf_UTF8;
717 PERL_UNUSED_ARG(full_len);
719 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
722 for (namend = name; *namend; namend++) {
723 if ((*namend == ':' && namend[1] == ':')
724 || (*namend == '\'' && namend[1]))
728 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
736 if (len + 3 < sizeof (smallbuf))
739 Newx(tmpbuf, len+3, char);
740 Copy(name, tmpbuf, len, char);
744 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
745 gv = gvp ? *gvp : Nullgv;
746 if (gv && gv != (GV*)&PL_sv_undef) {
747 if (SvTYPE(gv) != SVt_PVGV)
748 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
752 if (tmpbuf != smallbuf)
754 if (!gv || gv == (GV*)&PL_sv_undef)
757 if (!(stash = GvHV(gv)))
758 stash = GvHV(gv) = newHV();
760 if (!HvNAME_get(stash))
761 Perl_hv_name_set(aTHX_ stash, nambeg, namend - nambeg, 0);
769 return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE);
774 /* No stash in name, so see how we can default */
777 if (isIDFIRST_lazy(name)) {
780 /* name is always \0 terminated, and initial \0 wouldn't return
781 true from isIDFIRST_lazy, so we know that name[1] is defined */
788 if (strEQ(name, "INC") || strEQ(name, "ENV"))
792 if (strEQ(name, "SIG"))
796 if (strEQ(name, "STDIN") || strEQ(name, "STDOUT") ||
797 strEQ(name, "STDERR"))
801 if (strEQ(name, "ARGV") || strEQ(name, "ARGVOUT"))
808 else if (IN_PERL_COMPILETIME) {
810 if (add && (PL_hints & HINT_STRICT_VARS) &&
811 sv_type != SVt_PVCV &&
812 sv_type != SVt_PVGV &&
813 sv_type != SVt_PVFM &&
814 sv_type != SVt_PVIO &&
815 !(len == 1 && sv_type == SVt_PV &&
816 (*name == 'a' || *name == 'b')) )
818 gvp = (GV**)hv_fetch(stash,name,len,0);
820 *gvp == (GV*)&PL_sv_undef ||
821 SvTYPE(*gvp) != SVt_PVGV)
825 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
826 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
827 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
829 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
830 sv_type == SVt_PVAV ? '@' :
831 sv_type == SVt_PVHV ? '%' : '$',
834 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
840 stash = CopSTASH(PL_curcop);
846 /* By this point we should have a stash and a name */
850 SV * const err = Perl_mess(aTHX_
851 "Global symbol \"%s%s\" requires explicit package name",
852 (sv_type == SVt_PV ? "$"
853 : sv_type == SVt_PVAV ? "@"
854 : sv_type == SVt_PVHV ? "%"
856 if (USE_UTF8_IN_NAMES)
859 stash = GvHV(gv_fetchpv("<none>::", GV_ADDMULTI, SVt_PVHV));
865 if (!SvREFCNT(stash)) /* symbol table under destruction */
868 gvp = (GV**)hv_fetch(stash,name,len,add);
869 if (!gvp || *gvp == (GV*)&PL_sv_undef)
872 if (SvTYPE(gv) == SVt_PVGV) {
875 gv_init_sv(gv, sv_type);
876 if (*name=='!' && sv_type == SVt_PVHV && len==1)
880 } else if (add & GV_NOINIT) {
884 /* Adding a new symbol */
886 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
887 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
888 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
889 gv_init_sv(gv, sv_type);
891 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
892 : (PL_dowarn & G_WARN_ON ) ) )
895 /* set up magic where warranted */
899 /* Nothing else to do.
900 The compiler will probably turn the switch statement into a
901 branch table. Make sure we avoid even that small overhead for
902 the common case of lower case variable names. */
906 const char * const name2 = name + 1;
909 if (strEQ(name2, "RGV")) {
910 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
914 if (strnEQ(name2, "XPORT", 5))
918 if (strEQ(name2, "SA")) {
919 AV* const av = GvAVn(gv);
921 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, Nullch, 0);
922 /* NOTE: No support for tied ISA */
923 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
924 && AvFILLp(av) == -1)
927 av_push(av, newSVpvn(pname = "NDBM_File",9));
928 gv_stashpvn(pname, 9, TRUE);
929 av_push(av, newSVpvn(pname = "DB_File",7));
930 gv_stashpvn(pname, 7, TRUE);
931 av_push(av, newSVpvn(pname = "GDBM_File",9));
932 gv_stashpvn(pname, 9, TRUE);
933 av_push(av, newSVpvn(pname = "SDBM_File",9));
934 gv_stashpvn(pname, 9, TRUE);
935 av_push(av, newSVpvn(pname = "ODBM_File",9));
936 gv_stashpvn(pname, 9, TRUE);
941 if (strEQ(name2, "VERLOAD")) {
942 HV* const hv = GvHVn(gv);
944 hv_magic(hv, Nullgv, PERL_MAGIC_overload);
948 if (strEQ(name2, "IG")) {
952 Newxz(PL_psig_ptr, SIG_SIZE, SV*);
953 Newxz(PL_psig_name, SIG_SIZE, SV*);
954 Newxz(PL_psig_pend, SIG_SIZE, int);
958 hv_magic(hv, Nullgv, PERL_MAGIC_sig);
959 for (i = 1; i < SIG_SIZE; i++) {
960 SV ** const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
962 sv_setsv(*init, &PL_sv_undef);
970 if (strEQ(name2, "ERSION"))
973 case '\003': /* $^CHILD_ERROR_NATIVE */
974 if (strEQ(name2, "HILD_ERROR_NATIVE"))
977 case '\005': /* $^ENCODING */
978 if (strEQ(name2, "NCODING"))
981 case '\017': /* $^OPEN */
982 if (strEQ(name2, "PEN"))
985 case '\024': /* ${^TAINT} */
986 if (strEQ(name2, "AINT"))
989 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
990 if (strEQ(name2, "NICODE"))
992 if (strEQ(name2, "TF8LOCALE"))
995 case '\027': /* $^WARNING_BITS */
996 if (strEQ(name2, "ARNING_BITS"))
1009 /* ensures variable is only digits */
1010 /* ${"1foo"} fails this test (and is thus writeable) */
1011 /* added by japhy, but borrowed from is_gv_magical */
1012 const char *end = name + len;
1013 while (--end > name) {
1014 if (!isDIGIT(*end)) return gv;
1021 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1022 be case '\0' in this switch statement (ie a default case) */
1028 sv_type == SVt_PVAV ||
1029 sv_type == SVt_PVHV ||
1030 sv_type == SVt_PVCV ||
1031 sv_type == SVt_PVFM ||
1034 PL_sawampersand = TRUE;
1038 sv_setpv(GvSVn(gv),PL_chopset);
1042 #ifdef COMPLEX_STATUS
1043 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1049 /* If %! has been used, automatically load Errno.pm.
1050 The require will itself set errno, so in order to
1051 preserve its value we have to set up the magic
1052 now (rather than going to magicalize)
1055 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1057 if (sv_type == SVt_PVHV)
1063 AV* const av = GvAVn(gv);
1064 sv_magic((SV*)av, Nullsv, PERL_MAGIC_regdata, Nullch, 0);
1070 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1071 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1072 "$%c is no longer supported", *name);
1075 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1080 AV* const av = GvAVn(gv);
1081 sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, Nullch, 0);
1085 case '\023': /* $^S */
1096 SvREADONLY_on(GvSVn(gv));
1111 case '\001': /* $^A */
1112 case '\003': /* $^C */
1113 case '\004': /* $^D */
1114 case '\005': /* $^E */
1115 case '\006': /* $^F */
1116 case '\010': /* $^H */
1117 case '\011': /* $^I, NOT \t in EBCDIC */
1118 case '\016': /* $^N */
1119 case '\017': /* $^O */
1120 case '\020': /* $^P */
1121 case '\024': /* $^T */
1122 case '\027': /* $^W */
1124 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1127 case '\014': /* $^L */
1128 sv_setpvn(GvSVn(gv),"\f",1);
1129 PL_formfeed = GvSVn(gv);
1132 sv_setpvn(GvSVn(gv),"\034",1);
1136 SV * const sv = GvSVn(gv);
1137 if (!sv_derived_from(PL_patchlevel, "version"))
1138 (void *)upg_version(PL_patchlevel);
1139 GvSV(gv) = vnumify(PL_patchlevel);
1140 SvREADONLY_on(GvSV(gv));
1144 case '\026': /* $^V */
1146 SV * const sv = GvSVn(gv);
1147 GvSV(gv) = new_version(PL_patchlevel);
1148 SvREADONLY_on(GvSV(gv));
1158 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1162 const HV * const hv = GvSTASH(gv);
1167 sv_setpv(sv, prefix ? prefix : "");
1169 name = HvNAME_get(hv);
1171 namelen = HvNAMELEN_get(hv);
1177 if (keepmain || strNE(name, "main")) {
1178 sv_catpvn(sv,name,namelen);
1179 sv_catpvn(sv,"::", 2);
1181 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1185 Perl_gv_fullname3(pTHX_ SV *sv, const GV *gv, const char *prefix)
1187 gv_fullname4(sv, gv, prefix, TRUE);
1191 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1193 const GV *egv = GvEGV(gv);
1196 gv_fullname4(sv, egv, prefix, keepmain);
1200 Perl_gv_efullname3(pTHX_ SV *sv, const GV *gv, const char *prefix)
1202 gv_efullname4(sv, gv, prefix, TRUE);
1205 /* compatibility with versions <= 5.003. */
1207 Perl_gv_fullname(pTHX_ SV *sv, const GV *gv)
1209 gv_fullname3(sv, gv, sv == (const SV*)gv ? "*" : "");
1212 /* compatibility with versions <= 5.003. */
1214 Perl_gv_efullname(pTHX_ SV *sv, const GV *gv)
1216 gv_efullname3(sv, gv, sv == (const SV*)gv ? "*" : "");
1223 IO * const io = (IO*)NEWSV(0,0);
1225 sv_upgrade((SV *)io,SVt_PVIO);
1228 /* Clear the stashcache because a new IO could overrule a package name */
1229 hv_clear(PL_stashcache);
1230 iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV);
1231 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1232 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1233 iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV);
1234 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1239 Perl_gv_check(pTHX_ HV *stash)
1243 if (!HvARRAY(stash))
1245 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1247 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1250 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1251 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1253 if (hv != PL_defstash && hv != stash)
1254 gv_check(hv); /* nested package */
1256 else if (isALPHA(*HeKEY(entry))) {
1258 gv = (GV*)HeVAL(entry);
1259 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1262 /* performance hack: if filename is absolute and it's a standard
1263 * module, don't bother warning */
1265 && PERL_FILE_IS_ABSOLUTE(file)
1266 #ifdef MACOS_TRADITIONAL
1267 && (instr(file, ":lib:")
1269 && (instr(file, "/lib/")
1271 || instr(file, ".pm")))
1275 CopLINE_set(PL_curcop, GvLINE(gv));
1277 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1279 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1281 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1282 "Name \"%s::%s\" used only once: possible typo",
1283 HvNAME_get(stash), GvNAME(gv));
1290 Perl_newGVgen(pTHX_ const char *pack)
1292 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1296 /* hopefully this is only called on local symbol table entries */
1299 Perl_gp_ref(pTHX_ GP *gp)
1306 /* multi-named GPs cannot be used for method cache */
1307 SvREFCNT_dec(gp->gp_cv);
1312 /* Adding a new name to a subroutine invalidates method cache */
1313 PL_sub_generation++;
1320 Perl_gp_free(pTHX_ GV *gv)
1324 if (!gv || !(gp = GvGP(gv)))
1326 if (gp->gp_refcnt == 0) {
1327 if (ckWARN_d(WARN_INTERNAL))
1328 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1329 "Attempt to free unreferenced glob pointers"
1330 pTHX__FORMAT pTHX__VALUE);
1334 /* Deleting the name of a subroutine invalidates method cache */
1335 PL_sub_generation++;
1337 if (--gp->gp_refcnt > 0) {
1338 if (gp->gp_egv == gv)
1343 if (gp->gp_sv) SvREFCNT_dec(gp->gp_sv);
1344 if (gp->gp_av) SvREFCNT_dec(gp->gp_av);
1345 /* FIXME - another reference loop GV -> symtab -> GV ?
1346 Somehow gp->gp_hv can end up pointing at freed garbage. */
1347 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1348 const char *hvname = HvNAME_get(gp->gp_hv);
1349 if (PL_stashcache && hvname)
1350 hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv),
1352 SvREFCNT_dec(gp->gp_hv);
1354 if (gp->gp_io) SvREFCNT_dec(gp->gp_io);
1355 if (gp->gp_cv) SvREFCNT_dec(gp->gp_cv);
1356 if (gp->gp_form) SvREFCNT_dec(gp->gp_form);
1363 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1365 AMT * const amtp = (AMT*)mg->mg_ptr;
1366 PERL_UNUSED_ARG(sv);
1368 if (amtp && AMT_AMAGIC(amtp)) {
1370 for (i = 1; i < NofAMmeth; i++) {
1371 CV * const cv = amtp->table[i];
1373 SvREFCNT_dec((SV *) cv);
1374 amtp->table[i] = Nullcv;
1381 /* Updates and caches the CV's */
1384 Perl_Gv_AMupdate(pTHX_ HV *stash)
1386 MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1387 AMT * const amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
1390 if (mg && amtp->was_ok_am == PL_amagic_generation
1391 && amtp->was_ok_sub == PL_sub_generation)
1392 return (bool)AMT_OVERLOADED(amtp);
1393 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1395 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1398 amt.was_ok_am = PL_amagic_generation;
1399 amt.was_ok_sub = PL_sub_generation;
1400 amt.fallback = AMGfallNO;
1404 int filled = 0, have_ovl = 0;
1407 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1409 /* Try to find via inheritance. */
1410 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1411 SV * const sv = gv ? GvSV(gv) : NULL;
1415 lim = DESTROY_amg; /* Skip overloading entries. */
1416 #ifdef PERL_DONT_CREATE_GVSV
1418 /* Equivalent to !SvTRUE and !SvOK */
1421 else if (SvTRUE(sv))
1422 amt.fallback=AMGfallYES;
1424 amt.fallback=AMGfallNEVER;
1426 for (i = 1; i < lim; i++)
1427 amt.table[i] = Nullcv;
1428 for (; i < NofAMmeth; i++) {
1429 const char *cooky = PL_AMG_names[i];
1430 /* Human-readable form, for debugging: */
1431 const char *cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1432 const STRLEN l = strlen(cooky);
1434 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1435 cp, HvNAME_get(stash)) );
1436 /* don't fill the cache while looking up!
1437 Creation of inheritance stubs in intermediate packages may
1438 conflict with the logic of runtime method substitution.
1439 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1440 then we could have created stubs for "(+0" in A and C too.
1441 But if B overloads "bool", we may want to use it for
1442 numifying instead of C's "+0". */
1443 if (i >= DESTROY_amg)
1444 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1445 else /* Autoload taken care of below */
1446 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1448 if (gv && (cv = GvCV(gv))) {
1450 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1451 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1452 /* This is a hack to support autoloading..., while
1453 knowing *which* methods were declared as overloaded. */
1454 /* GvSV contains the name of the method. */
1456 SV *gvsv = GvSV(gv);
1458 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1459 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1460 GvSV(gv), cp, hvname) );
1461 if (!gvsv || !SvPOK(gvsv)
1462 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1465 /* Can be an import stub (created by "can"). */
1466 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1467 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1468 "in package \"%.256s\"",
1469 (GvCVGEN(gv) ? "Stub found while resolving"
1473 cv = GvCV(gv = ngv);
1475 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1476 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1477 GvNAME(CvGV(cv))) );
1479 if (i < DESTROY_amg)
1481 } else if (gv) { /* Autoloaded... */
1485 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1488 AMT_AMAGIC_on(&amt);
1490 AMT_OVERLOADED_on(&amt);
1491 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1492 (char*)&amt, sizeof(AMT));
1496 /* Here we have no table: */
1498 AMT_AMAGIC_off(&amt);
1499 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1500 (char*)&amt, sizeof(AMTS));
1506 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1511 if (!stash || !HvNAME_get(stash))
1513 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1517 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1519 amtp = (AMT*)mg->mg_ptr;
1520 if ( amtp->was_ok_am != PL_amagic_generation
1521 || amtp->was_ok_sub != PL_sub_generation )
1523 if (AMT_AMAGIC(amtp)) {
1524 CV * const ret = amtp->table[id];
1525 if (ret && isGV(ret)) { /* Autoloading stab */
1526 /* Passing it through may have resulted in a warning
1527 "Inherited AUTOLOAD for a non-method deprecated", since
1528 our caller is going through a function call, not a method call.
1529 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1530 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1543 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1548 CV **cvp=NULL, **ocvp=NULL;
1549 AMT *amtp=NULL, *oamtp=NULL;
1550 int off = 0, off1, lr = 0, notfound = 0;
1551 int postpr = 0, force_cpy = 0;
1552 int assign = AMGf_assign & flags;
1553 const int assignshift = assign ? 1 : 0;
1558 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1559 && (stash = SvSTASH(SvRV(left)))
1560 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1561 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1562 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1564 && ((cv = cvp[off=method+assignshift])
1565 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1571 cv = cvp[off=method])))) {
1572 lr = -1; /* Call method for left argument */
1574 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1577 /* look for substituted methods */
1578 /* In all the covered cases we should be called with assign==0. */
1582 if ((cv = cvp[off=add_ass_amg])
1583 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1584 right = &PL_sv_yes; lr = -1; assign = 1;
1589 if ((cv = cvp[off = subtr_ass_amg])
1590 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1591 right = &PL_sv_yes; lr = -1; assign = 1;
1595 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1598 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1601 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1604 (void)((cv = cvp[off=bool__amg])
1605 || (cv = cvp[off=numer_amg])
1606 || (cv = cvp[off=string_amg]));
1612 * SV* ref causes confusion with the interpreter variable of
1615 SV* const tmpRef=SvRV(left);
1616 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1618 * Just to be extra cautious. Maybe in some
1619 * additional cases sv_setsv is safe, too.
1621 SV* const newref = newSVsv(tmpRef);
1622 SvOBJECT_on(newref);
1623 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1629 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1630 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1631 SV* const nullsv=sv_2mortal(newSViv(0));
1633 SV* const lessp = amagic_call(left,nullsv,
1634 lt_amg,AMGf_noright);
1635 logic = SvTRUE(lessp);
1637 SV* const lessp = amagic_call(left,nullsv,
1638 ncmp_amg,AMGf_noright);
1639 logic = (SvNV(lessp) < 0);
1642 if (off==subtr_amg) {
1653 if ((cv = cvp[off=subtr_amg])) {
1655 left = sv_2mortal(newSViv(0));
1660 case iter_amg: /* XXXX Eventually should do to_gv. */
1662 return NULL; /* Delegate operation to standard mechanisms. */
1670 return left; /* Delegate operation to standard mechanisms. */
1675 if (!cv) goto not_found;
1676 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1677 && (stash = SvSTASH(SvRV(right)))
1678 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1679 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1680 ? (amtp = (AMT*)mg->mg_ptr)->table
1682 && (cv = cvp[off=method])) { /* Method for right
1685 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1686 && (cvp=ocvp) && (lr = -1))
1687 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1688 && !(flags & AMGf_unary)) {
1689 /* We look for substitution for
1690 * comparison operations and
1692 if (method==concat_amg || method==concat_ass_amg
1693 || method==repeat_amg || method==repeat_ass_amg) {
1694 return NULL; /* Delegate operation to string conversion */
1704 postpr = 1; off=ncmp_amg; break;
1711 postpr = 1; off=scmp_amg; break;
1713 if (off != -1) cv = cvp[off];
1718 not_found: /* No method found, either report or croak */
1726 return left; /* Delegate operation to standard mechanisms. */
1729 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1730 notfound = 1; lr = -1;
1731 } else if (cvp && (cv=cvp[nomethod_amg])) {
1732 notfound = 1; lr = 1;
1735 if (off==-1) off=method;
1736 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1737 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1738 AMG_id2name(method + assignshift),
1739 (flags & AMGf_unary ? " " : "\n\tleft "),
1741 "in overloaded package ":
1742 "has no overloaded magic",
1744 HvNAME_get(SvSTASH(SvRV(left))):
1747 ",\n\tright argument in overloaded package ":
1750 : ",\n\tright argument has no overloaded magic"),
1752 HvNAME_get(SvSTASH(SvRV(right))):
1754 if (amtp && amtp->fallback >= AMGfallYES) {
1755 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1757 Perl_croak(aTHX_ "%"SVf, msg);
1761 force_cpy = force_cpy || assign;
1766 DEBUG_o(Perl_deb(aTHX_
1767 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1769 method+assignshift==off? "" :
1771 method+assignshift==off? "" :
1772 AMG_id2name(method+assignshift),
1773 method+assignshift==off? "" : "\")",
1774 flags & AMGf_unary? "" :
1775 lr==1 ? " for right argument": " for left argument",
1776 flags & AMGf_unary? " for argument" : "",
1777 stash ? HvNAME_get(stash) : "null",
1778 fl? ",\n\tassignment variant used": "") );
1781 /* Since we use shallow copy during assignment, we need
1782 * to dublicate the contents, probably calling user-supplied
1783 * version of copy operator
1785 /* We need to copy in following cases:
1786 * a) Assignment form was called.
1787 * assignshift==1, assign==T, method + 1 == off
1788 * b) Increment or decrement, called directly.
1789 * assignshift==0, assign==0, method + 0 == off
1790 * c) Increment or decrement, translated to assignment add/subtr.
1791 * assignshift==0, assign==T,
1793 * d) Increment or decrement, translated to nomethod.
1794 * assignshift==0, assign==0,
1796 * e) Assignment form translated to nomethod.
1797 * assignshift==1, assign==T, method + 1 != off
1800 /* off is method, method+assignshift, or a result of opcode substitution.
1801 * In the latter case assignshift==0, so only notfound case is important.
1803 if (( (method + assignshift == off)
1804 && (assign || (method == inc_amg) || (method == dec_amg)))
1811 const bool oldcatch = CATCH_GET;
1814 Zero(&myop, 1, BINOP);
1815 myop.op_last = (OP *) &myop;
1816 myop.op_next = Nullop;
1817 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1819 PUSHSTACKi(PERLSI_OVERLOAD);
1822 PL_op = (OP *) &myop;
1823 if (PERLDB_SUB && PL_curstash != PL_debstash)
1824 PL_op->op_private |= OPpENTERSUB_DB;
1828 EXTEND(SP, notfound + 5);
1829 PUSHs(lr>0? right: left);
1830 PUSHs(lr>0? left: right);
1831 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1833 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1838 if ((PL_op = Perl_pp_entersub(aTHX)))
1846 CATCH_SET(oldcatch);
1853 ans=SvIV(res)<=0; break;
1856 ans=SvIV(res)<0; break;
1859 ans=SvIV(res)>=0; break;
1862 ans=SvIV(res)>0; break;
1865 ans=SvIV(res)==0; break;
1868 ans=SvIV(res)!=0; break;
1871 SvSetSV(left,res); return left;
1873 ans=!SvTRUE(res); break;
1878 } else if (method==copy_amg) {
1880 Perl_croak(aTHX_ "Copy method did not return a reference");
1882 return SvREFCNT_inc(SvRV(res));
1890 =for apidoc is_gv_magical_sv
1892 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
1898 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
1901 const char * const temp = SvPV_const(name, len);
1902 return is_gv_magical(temp, len, flags);
1906 =for apidoc is_gv_magical
1908 Returns C<TRUE> if given the name of a magical GV.
1910 Currently only useful internally when determining if a GV should be
1911 created even in rvalue contexts.
1913 C<flags> is not used at present but available for future extension to
1914 allow selecting particular classes of magical variable.
1916 Currently assumes that C<name> is NUL terminated (as well as len being valid).
1917 This assumption is met by all callers within the perl core, which all pass
1918 pointers returned by SvPV.
1923 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
1925 PERL_UNUSED_ARG(flags);
1928 const char * const name1 = name + 1;
1931 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
1935 if (len == 8 && strEQ(name1, "VERLOAD"))
1939 if (len == 3 && name[1] == 'I' && name[2] == 'G')
1942 /* Using ${^...} variables is likely to be sufficiently rare that
1943 it seems sensible to avoid the space hit of also checking the
1945 case '\017': /* ${^OPEN} */
1946 if (strEQ(name1, "PEN"))
1949 case '\024': /* ${^TAINT} */
1950 if (strEQ(name1, "AINT"))
1953 case '\025': /* ${^UNICODE} */
1954 if (strEQ(name1, "NICODE"))
1956 if (strEQ(name1, "TF8LOCALE"))
1959 case '\027': /* ${^WARNING_BITS} */
1960 if (strEQ(name1, "ARNING_BITS"))
1973 const char *end = name + len;
1974 while (--end > name) {
1982 /* Because we're already assuming that name is NUL terminated
1983 below, we can treat an empty name as "\0" */
2010 case '\001': /* $^A */
2011 case '\003': /* $^C */
2012 case '\004': /* $^D */
2013 case '\005': /* $^E */
2014 case '\006': /* $^F */
2015 case '\010': /* $^H */
2016 case '\011': /* $^I, NOT \t in EBCDIC */
2017 case '\014': /* $^L */
2018 case '\016': /* $^N */
2019 case '\017': /* $^O */
2020 case '\020': /* $^P */
2021 case '\023': /* $^S */
2022 case '\024': /* $^T */
2023 case '\026': /* $^V */
2024 case '\027': /* $^W */
2045 * c-indentation-style: bsd
2047 * indent-tabs-mode: t
2050 * ex: set ts=8 sts=4 sw=4 noet: