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 (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
551 && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)
553 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
554 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
555 packname, (int)len, name);
558 /* rather than lookup/init $AUTOLOAD here
559 * only to have the XSUB do another lookup for $AUTOLOAD
560 * and split that value on the last '::',
561 * pass along the same data via some unused fields in the CV
564 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
570 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
571 * The subroutine's original name may not be "AUTOLOAD", so we don't
572 * use that, but for lack of anything better we will use the sub's
573 * original package to look up $AUTOLOAD.
575 varstash = GvSTASH(CvGV(cv));
576 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
580 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
581 #ifdef PERL_DONT_CREATE_GVSV
582 GvSV(vargv) = NEWSV(72,0);
586 varsv = GvSVn(vargv);
587 sv_setpvn(varsv, packname, packname_len);
588 sv_catpvn(varsv, "::", 2);
589 sv_catpvn(varsv, name, len);
590 SvTAINTED_off(varsv);
594 /* The "gv" parameter should be the glob known to Perl code as *!
595 * The scalar must already have been magicalized.
598 S_require_errno(pTHX_ GV *gv)
601 HV* stash = gv_stashpvn("Errno",5,FALSE);
603 if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
607 save_scalar(gv); /* keep the value of $! */
608 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
609 newSVpvn("Errno",5), Nullsv);
612 stash = gv_stashpvn("Errno",5,FALSE);
613 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
614 Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available");
619 =for apidoc gv_stashpv
621 Returns a pointer to the stash for a specified package. C<name> should
622 be a valid UTF-8 string and must be null-terminated. If C<create> is set
623 then the package will be created if it does not already exist. If C<create>
624 is not set and the package does not exist then NULL is returned.
630 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
632 return gv_stashpvn(name, strlen(name), create);
636 =for apidoc gv_stashpvn
638 Returns a pointer to the stash for a specified package. C<name> should
639 be a valid UTF-8 string. The C<namelen> parameter indicates the length of
640 the C<name>, in bytes. If C<create> is set then the package will be
641 created if it does not already exist. If C<create> is not set and the
642 package does not exist then NULL is returned.
648 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
655 if (namelen + 3 < sizeof smallbuf)
658 Newx(tmpbuf, namelen + 3, char);
659 Copy(name,tmpbuf,namelen,char);
660 tmpbuf[namelen++] = ':';
661 tmpbuf[namelen++] = ':';
662 tmpbuf[namelen] = '\0';
663 tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV);
664 if (tmpbuf != smallbuf)
669 GvHV(tmpgv) = newHV();
671 if (!HvNAME_get(stash))
672 Perl_hv_name_set(aTHX_ stash, name, namelen, 0);
677 =for apidoc gv_stashsv
679 Returns a pointer to the stash for a specified package, which must be a
680 valid UTF-8 string. See C<gv_stashpv>.
686 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
689 const char * const ptr = SvPV_const(sv,len);
690 return gv_stashpvn(ptr, len, create);
695 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
696 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
700 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
702 const char * const nambeg = SvPV_const(name, len);
703 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
707 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
710 register const char *name = nambeg;
714 register const char *namend;
716 const I32 add = flags & ~SVf_UTF8;
718 PERL_UNUSED_ARG(full_len);
720 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
723 for (namend = name; *namend; namend++) {
724 if ((*namend == ':' && namend[1] == ':')
725 || (*namend == '\'' && namend[1]))
729 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
737 if (len + 3 < sizeof (smallbuf))
740 Newx(tmpbuf, len+3, char);
741 Copy(name, tmpbuf, len, char);
745 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
746 gv = gvp ? *gvp : Nullgv;
747 if (gv && gv != (GV*)&PL_sv_undef) {
748 if (SvTYPE(gv) != SVt_PVGV)
749 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
753 if (tmpbuf != smallbuf)
755 if (!gv || gv == (GV*)&PL_sv_undef)
758 if (!(stash = GvHV(gv)))
759 stash = GvHV(gv) = newHV();
761 if (!HvNAME_get(stash))
762 Perl_hv_name_set(aTHX_ stash, nambeg, namend - nambeg, 0);
770 return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE);
775 /* No stash in name, so see how we can default */
778 if (isIDFIRST_lazy(name)) {
781 /* name is always \0 terminated, and initial \0 wouldn't return
782 true from isIDFIRST_lazy, so we know that name[1] is defined */
789 if (strEQ(name, "INC") || strEQ(name, "ENV"))
793 if (strEQ(name, "SIG"))
797 if (strEQ(name, "STDIN") || strEQ(name, "STDOUT") ||
798 strEQ(name, "STDERR"))
802 if (strEQ(name, "ARGV") || strEQ(name, "ARGVOUT"))
809 else if (IN_PERL_COMPILETIME) {
811 if (add && (PL_hints & HINT_STRICT_VARS) &&
812 sv_type != SVt_PVCV &&
813 sv_type != SVt_PVGV &&
814 sv_type != SVt_PVFM &&
815 sv_type != SVt_PVIO &&
816 !(len == 1 && sv_type == SVt_PV &&
817 (*name == 'a' || *name == 'b')) )
819 gvp = (GV**)hv_fetch(stash,name,len,0);
821 *gvp == (GV*)&PL_sv_undef ||
822 SvTYPE(*gvp) != SVt_PVGV)
826 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
827 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
828 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
830 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
831 sv_type == SVt_PVAV ? '@' :
832 sv_type == SVt_PVHV ? '%' : '$',
835 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
841 stash = CopSTASH(PL_curcop);
847 /* By this point we should have a stash and a name */
851 SV * const err = Perl_mess(aTHX_
852 "Global symbol \"%s%s\" requires explicit package name",
853 (sv_type == SVt_PV ? "$"
854 : sv_type == SVt_PVAV ? "@"
855 : sv_type == SVt_PVHV ? "%"
857 if (USE_UTF8_IN_NAMES)
860 stash = GvHV(gv_fetchpv("<none>::", GV_ADDMULTI, SVt_PVHV));
866 if (!SvREFCNT(stash)) /* symbol table under destruction */
869 gvp = (GV**)hv_fetch(stash,name,len,add);
870 if (!gvp || *gvp == (GV*)&PL_sv_undef)
873 if (SvTYPE(gv) == SVt_PVGV) {
876 gv_init_sv(gv, sv_type);
877 if (*name=='!' && sv_type == SVt_PVHV && len==1)
881 } else if (add & GV_NOINIT) {
885 /* Adding a new symbol */
887 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
888 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
889 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
890 gv_init_sv(gv, sv_type);
892 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
893 : (PL_dowarn & G_WARN_ON ) ) )
896 /* set up magic where warranted */
900 /* Nothing else to do.
901 The compiler will probably turn the switch statement into a
902 branch table. Make sure we avoid even that small overhead for
903 the common case of lower case variable names. */
907 const char * const name2 = name + 1;
910 if (strEQ(name2, "RGV")) {
911 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
915 if (strnEQ(name2, "XPORT", 5))
919 if (strEQ(name2, "SA")) {
920 AV* const av = GvAVn(gv);
922 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, Nullch, 0);
923 /* NOTE: No support for tied ISA */
924 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
925 && AvFILLp(av) == -1)
928 av_push(av, newSVpvn(pname = "NDBM_File",9));
929 gv_stashpvn(pname, 9, TRUE);
930 av_push(av, newSVpvn(pname = "DB_File",7));
931 gv_stashpvn(pname, 7, TRUE);
932 av_push(av, newSVpvn(pname = "GDBM_File",9));
933 gv_stashpvn(pname, 9, TRUE);
934 av_push(av, newSVpvn(pname = "SDBM_File",9));
935 gv_stashpvn(pname, 9, TRUE);
936 av_push(av, newSVpvn(pname = "ODBM_File",9));
937 gv_stashpvn(pname, 9, TRUE);
942 if (strEQ(name2, "VERLOAD")) {
943 HV* const hv = GvHVn(gv);
945 hv_magic(hv, Nullgv, PERL_MAGIC_overload);
949 if (strEQ(name2, "IG")) {
953 Newxz(PL_psig_ptr, SIG_SIZE, SV*);
954 Newxz(PL_psig_name, SIG_SIZE, SV*);
955 Newxz(PL_psig_pend, SIG_SIZE, int);
959 hv_magic(hv, Nullgv, PERL_MAGIC_sig);
960 for (i = 1; i < SIG_SIZE; i++) {
961 SV ** const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
963 sv_setsv(*init, &PL_sv_undef);
971 if (strEQ(name2, "ERSION"))
974 case '\003': /* $^CHILD_ERROR_NATIVE */
975 if (strEQ(name2, "HILD_ERROR_NATIVE"))
978 case '\005': /* $^ENCODING */
979 if (strEQ(name2, "NCODING"))
982 case '\017': /* $^OPEN */
983 if (strEQ(name2, "PEN"))
986 case '\024': /* ${^TAINT} */
987 if (strEQ(name2, "AINT"))
990 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
991 if (strEQ(name2, "NICODE"))
993 if (strEQ(name2, "TF8LOCALE"))
996 case '\027': /* $^WARNING_BITS */
997 if (strEQ(name2, "ARNING_BITS"))
1010 /* ensures variable is only digits */
1011 /* ${"1foo"} fails this test (and is thus writeable) */
1012 /* added by japhy, but borrowed from is_gv_magical */
1013 const char *end = name + len;
1014 while (--end > name) {
1015 if (!isDIGIT(*end)) return gv;
1022 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1023 be case '\0' in this switch statement (ie a default case) */
1029 sv_type == SVt_PVAV ||
1030 sv_type == SVt_PVHV ||
1031 sv_type == SVt_PVCV ||
1032 sv_type == SVt_PVFM ||
1035 PL_sawampersand = TRUE;
1039 sv_setpv(GvSVn(gv),PL_chopset);
1043 #ifdef COMPLEX_STATUS
1044 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1050 /* If %! has been used, automatically load Errno.pm.
1051 The require will itself set errno, so in order to
1052 preserve its value we have to set up the magic
1053 now (rather than going to magicalize)
1056 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1058 if (sv_type == SVt_PVHV)
1064 AV* const av = GvAVn(gv);
1065 sv_magic((SV*)av, Nullsv, PERL_MAGIC_regdata, Nullch, 0);
1071 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1072 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1073 "$%c is no longer supported", *name);
1076 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1081 AV* const av = GvAVn(gv);
1082 sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, Nullch, 0);
1086 case '\023': /* $^S */
1097 SvREADONLY_on(GvSVn(gv));
1112 case '\001': /* $^A */
1113 case '\003': /* $^C */
1114 case '\004': /* $^D */
1115 case '\005': /* $^E */
1116 case '\006': /* $^F */
1117 case '\010': /* $^H */
1118 case '\011': /* $^I, NOT \t in EBCDIC */
1119 case '\016': /* $^N */
1120 case '\017': /* $^O */
1121 case '\020': /* $^P */
1122 case '\024': /* $^T */
1123 case '\027': /* $^W */
1125 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1128 case '\014': /* $^L */
1129 sv_setpvn(GvSVn(gv),"\f",1);
1130 PL_formfeed = GvSVn(gv);
1133 sv_setpvn(GvSVn(gv),"\034",1);
1137 SV * const sv = GvSVn(gv);
1138 if (!sv_derived_from(PL_patchlevel, "version"))
1139 (void *)upg_version(PL_patchlevel);
1140 GvSV(gv) = vnumify(PL_patchlevel);
1141 SvREADONLY_on(GvSV(gv));
1145 case '\026': /* $^V */
1147 SV * const sv = GvSVn(gv);
1148 GvSV(gv) = new_version(PL_patchlevel);
1149 SvREADONLY_on(GvSV(gv));
1159 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1163 const HV * const hv = GvSTASH(gv);
1168 sv_setpv(sv, prefix ? prefix : "");
1170 name = HvNAME_get(hv);
1172 namelen = HvNAMELEN_get(hv);
1178 if (keepmain || strNE(name, "main")) {
1179 sv_catpvn(sv,name,namelen);
1180 sv_catpvn(sv,"::", 2);
1182 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1186 Perl_gv_fullname3(pTHX_ SV *sv, const GV *gv, const char *prefix)
1188 gv_fullname4(sv, gv, prefix, TRUE);
1192 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1194 const GV * const egv = GvEGV(gv);
1195 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1199 Perl_gv_efullname3(pTHX_ SV *sv, const GV *gv, const char *prefix)
1201 gv_efullname4(sv, gv, prefix, TRUE);
1204 /* compatibility with versions <= 5.003. */
1206 Perl_gv_fullname(pTHX_ SV *sv, const GV *gv)
1208 gv_fullname3(sv, gv, sv == (const SV*)gv ? "*" : "");
1211 /* compatibility with versions <= 5.003. */
1213 Perl_gv_efullname(pTHX_ SV *sv, const GV *gv)
1215 gv_efullname3(sv, gv, sv == (const SV*)gv ? "*" : "");
1222 IO * const io = (IO*)NEWSV(0,0);
1224 sv_upgrade((SV *)io,SVt_PVIO);
1227 /* Clear the stashcache because a new IO could overrule a package name */
1228 hv_clear(PL_stashcache);
1229 iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV);
1230 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1231 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1232 iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV);
1233 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1238 Perl_gv_check(pTHX_ HV *stash)
1242 if (!HvARRAY(stash))
1244 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1246 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1249 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1250 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1252 if (hv != PL_defstash && hv != stash)
1253 gv_check(hv); /* nested package */
1255 else if (isALPHA(*HeKEY(entry))) {
1257 gv = (GV*)HeVAL(entry);
1258 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1261 /* performance hack: if filename is absolute and it's a standard
1262 * module, don't bother warning */
1264 && PERL_FILE_IS_ABSOLUTE(file)
1265 #ifdef MACOS_TRADITIONAL
1266 && (instr(file, ":lib:")
1268 && (instr(file, "/lib/")
1270 || instr(file, ".pm")))
1274 CopLINE_set(PL_curcop, GvLINE(gv));
1276 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1278 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1280 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1281 "Name \"%s::%s\" used only once: possible typo",
1282 HvNAME_get(stash), GvNAME(gv));
1289 Perl_newGVgen(pTHX_ const char *pack)
1291 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1295 /* hopefully this is only called on local symbol table entries */
1298 Perl_gp_ref(pTHX_ GP *gp)
1305 /* multi-named GPs cannot be used for method cache */
1306 SvREFCNT_dec(gp->gp_cv);
1311 /* Adding a new name to a subroutine invalidates method cache */
1312 PL_sub_generation++;
1319 Perl_gp_free(pTHX_ GV *gv)
1323 if (!gv || !(gp = GvGP(gv)))
1325 if (gp->gp_refcnt == 0) {
1326 if (ckWARN_d(WARN_INTERNAL))
1327 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1328 "Attempt to free unreferenced glob pointers"
1329 pTHX__FORMAT pTHX__VALUE);
1333 /* Deleting the name of a subroutine invalidates method cache */
1334 PL_sub_generation++;
1336 if (--gp->gp_refcnt > 0) {
1337 if (gp->gp_egv == gv)
1342 if (gp->gp_sv) SvREFCNT_dec(gp->gp_sv);
1343 if (gp->gp_av) SvREFCNT_dec(gp->gp_av);
1344 /* FIXME - another reference loop GV -> symtab -> GV ?
1345 Somehow gp->gp_hv can end up pointing at freed garbage. */
1346 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1347 const char *hvname = HvNAME_get(gp->gp_hv);
1348 if (PL_stashcache && hvname)
1349 hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv),
1351 SvREFCNT_dec(gp->gp_hv);
1353 if (gp->gp_io) SvREFCNT_dec(gp->gp_io);
1354 if (gp->gp_cv) SvREFCNT_dec(gp->gp_cv);
1355 if (gp->gp_form) SvREFCNT_dec(gp->gp_form);
1362 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1364 AMT * const amtp = (AMT*)mg->mg_ptr;
1365 PERL_UNUSED_ARG(sv);
1367 if (amtp && AMT_AMAGIC(amtp)) {
1369 for (i = 1; i < NofAMmeth; i++) {
1370 CV * const cv = amtp->table[i];
1372 SvREFCNT_dec((SV *) cv);
1373 amtp->table[i] = Nullcv;
1380 /* Updates and caches the CV's */
1383 Perl_Gv_AMupdate(pTHX_ HV *stash)
1385 MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1386 AMT * const amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
1389 if (mg && amtp->was_ok_am == PL_amagic_generation
1390 && amtp->was_ok_sub == PL_sub_generation)
1391 return (bool)AMT_OVERLOADED(amtp);
1392 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1394 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1397 amt.was_ok_am = PL_amagic_generation;
1398 amt.was_ok_sub = PL_sub_generation;
1399 amt.fallback = AMGfallNO;
1403 int filled = 0, have_ovl = 0;
1406 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1408 /* Try to find via inheritance. */
1409 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1410 SV * const sv = gv ? GvSV(gv) : NULL;
1414 lim = DESTROY_amg; /* Skip overloading entries. */
1415 #ifdef PERL_DONT_CREATE_GVSV
1417 /* Equivalent to !SvTRUE and !SvOK */
1420 else if (SvTRUE(sv))
1421 amt.fallback=AMGfallYES;
1423 amt.fallback=AMGfallNEVER;
1425 for (i = 1; i < lim; i++)
1426 amt.table[i] = Nullcv;
1427 for (; i < NofAMmeth; i++) {
1428 const char *cooky = PL_AMG_names[i];
1429 /* Human-readable form, for debugging: */
1430 const char *cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1431 const STRLEN l = strlen(cooky);
1433 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1434 cp, HvNAME_get(stash)) );
1435 /* don't fill the cache while looking up!
1436 Creation of inheritance stubs in intermediate packages may
1437 conflict with the logic of runtime method substitution.
1438 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1439 then we could have created stubs for "(+0" in A and C too.
1440 But if B overloads "bool", we may want to use it for
1441 numifying instead of C's "+0". */
1442 if (i >= DESTROY_amg)
1443 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1444 else /* Autoload taken care of below */
1445 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1447 if (gv && (cv = GvCV(gv))) {
1449 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1450 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1451 /* This is a hack to support autoloading..., while
1452 knowing *which* methods were declared as overloaded. */
1453 /* GvSV contains the name of the method. */
1455 SV *gvsv = GvSV(gv);
1457 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1458 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1459 GvSV(gv), cp, hvname) );
1460 if (!gvsv || !SvPOK(gvsv)
1461 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1464 /* Can be an import stub (created by "can"). */
1465 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1466 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1467 "in package \"%.256s\"",
1468 (GvCVGEN(gv) ? "Stub found while resolving"
1472 cv = GvCV(gv = ngv);
1474 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1475 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1476 GvNAME(CvGV(cv))) );
1478 if (i < DESTROY_amg)
1480 } else if (gv) { /* Autoloaded... */
1484 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1487 AMT_AMAGIC_on(&amt);
1489 AMT_OVERLOADED_on(&amt);
1490 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1491 (char*)&amt, sizeof(AMT));
1495 /* Here we have no table: */
1497 AMT_AMAGIC_off(&amt);
1498 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1499 (char*)&amt, sizeof(AMTS));
1505 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1510 if (!stash || !HvNAME_get(stash))
1512 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1516 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1518 amtp = (AMT*)mg->mg_ptr;
1519 if ( amtp->was_ok_am != PL_amagic_generation
1520 || amtp->was_ok_sub != PL_sub_generation )
1522 if (AMT_AMAGIC(amtp)) {
1523 CV * const ret = amtp->table[id];
1524 if (ret && isGV(ret)) { /* Autoloading stab */
1525 /* Passing it through may have resulted in a warning
1526 "Inherited AUTOLOAD for a non-method deprecated", since
1527 our caller is going through a function call, not a method call.
1528 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1529 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1542 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1547 CV **cvp=NULL, **ocvp=NULL;
1548 AMT *amtp=NULL, *oamtp=NULL;
1549 int off = 0, off1, lr = 0, notfound = 0;
1550 int postpr = 0, force_cpy = 0;
1551 int assign = AMGf_assign & flags;
1552 const int assignshift = assign ? 1 : 0;
1557 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1558 && (stash = SvSTASH(SvRV(left)))
1559 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1560 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1561 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1563 && ((cv = cvp[off=method+assignshift])
1564 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1570 cv = cvp[off=method])))) {
1571 lr = -1; /* Call method for left argument */
1573 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1576 /* look for substituted methods */
1577 /* In all the covered cases we should be called with assign==0. */
1581 if ((cv = cvp[off=add_ass_amg])
1582 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1583 right = &PL_sv_yes; lr = -1; assign = 1;
1588 if ((cv = cvp[off = subtr_ass_amg])
1589 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1590 right = &PL_sv_yes; lr = -1; assign = 1;
1594 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1597 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1600 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1603 (void)((cv = cvp[off=bool__amg])
1604 || (cv = cvp[off=numer_amg])
1605 || (cv = cvp[off=string_amg]));
1611 * SV* ref causes confusion with the interpreter variable of
1614 SV* const tmpRef=SvRV(left);
1615 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1617 * Just to be extra cautious. Maybe in some
1618 * additional cases sv_setsv is safe, too.
1620 SV* const newref = newSVsv(tmpRef);
1621 SvOBJECT_on(newref);
1622 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1628 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1629 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1630 SV* const nullsv=sv_2mortal(newSViv(0));
1632 SV* const lessp = amagic_call(left,nullsv,
1633 lt_amg,AMGf_noright);
1634 logic = SvTRUE(lessp);
1636 SV* const lessp = amagic_call(left,nullsv,
1637 ncmp_amg,AMGf_noright);
1638 logic = (SvNV(lessp) < 0);
1641 if (off==subtr_amg) {
1652 if ((cv = cvp[off=subtr_amg])) {
1654 left = sv_2mortal(newSViv(0));
1659 case iter_amg: /* XXXX Eventually should do to_gv. */
1661 return NULL; /* Delegate operation to standard mechanisms. */
1669 return left; /* Delegate operation to standard mechanisms. */
1674 if (!cv) goto not_found;
1675 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1676 && (stash = SvSTASH(SvRV(right)))
1677 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1678 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1679 ? (amtp = (AMT*)mg->mg_ptr)->table
1681 && (cv = cvp[off=method])) { /* Method for right
1684 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1685 && (cvp=ocvp) && (lr = -1))
1686 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1687 && !(flags & AMGf_unary)) {
1688 /* We look for substitution for
1689 * comparison operations and
1691 if (method==concat_amg || method==concat_ass_amg
1692 || method==repeat_amg || method==repeat_ass_amg) {
1693 return NULL; /* Delegate operation to string conversion */
1703 postpr = 1; off=ncmp_amg; break;
1710 postpr = 1; off=scmp_amg; break;
1712 if (off != -1) cv = cvp[off];
1717 not_found: /* No method found, either report or croak */
1725 return left; /* Delegate operation to standard mechanisms. */
1728 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1729 notfound = 1; lr = -1;
1730 } else if (cvp && (cv=cvp[nomethod_amg])) {
1731 notfound = 1; lr = 1;
1734 if (off==-1) off=method;
1735 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1736 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1737 AMG_id2name(method + assignshift),
1738 (flags & AMGf_unary ? " " : "\n\tleft "),
1740 "in overloaded package ":
1741 "has no overloaded magic",
1743 HvNAME_get(SvSTASH(SvRV(left))):
1746 ",\n\tright argument in overloaded package ":
1749 : ",\n\tright argument has no overloaded magic"),
1751 HvNAME_get(SvSTASH(SvRV(right))):
1753 if (amtp && amtp->fallback >= AMGfallYES) {
1754 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1756 Perl_croak(aTHX_ "%"SVf, msg);
1760 force_cpy = force_cpy || assign;
1765 DEBUG_o(Perl_deb(aTHX_
1766 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1768 method+assignshift==off? "" :
1770 method+assignshift==off? "" :
1771 AMG_id2name(method+assignshift),
1772 method+assignshift==off? "" : "\")",
1773 flags & AMGf_unary? "" :
1774 lr==1 ? " for right argument": " for left argument",
1775 flags & AMGf_unary? " for argument" : "",
1776 stash ? HvNAME_get(stash) : "null",
1777 fl? ",\n\tassignment variant used": "") );
1780 /* Since we use shallow copy during assignment, we need
1781 * to dublicate the contents, probably calling user-supplied
1782 * version of copy operator
1784 /* We need to copy in following cases:
1785 * a) Assignment form was called.
1786 * assignshift==1, assign==T, method + 1 == off
1787 * b) Increment or decrement, called directly.
1788 * assignshift==0, assign==0, method + 0 == off
1789 * c) Increment or decrement, translated to assignment add/subtr.
1790 * assignshift==0, assign==T,
1792 * d) Increment or decrement, translated to nomethod.
1793 * assignshift==0, assign==0,
1795 * e) Assignment form translated to nomethod.
1796 * assignshift==1, assign==T, method + 1 != off
1799 /* off is method, method+assignshift, or a result of opcode substitution.
1800 * In the latter case assignshift==0, so only notfound case is important.
1802 if (( (method + assignshift == off)
1803 && (assign || (method == inc_amg) || (method == dec_amg)))
1810 const bool oldcatch = CATCH_GET;
1813 Zero(&myop, 1, BINOP);
1814 myop.op_last = (OP *) &myop;
1815 myop.op_next = Nullop;
1816 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1818 PUSHSTACKi(PERLSI_OVERLOAD);
1821 PL_op = (OP *) &myop;
1822 if (PERLDB_SUB && PL_curstash != PL_debstash)
1823 PL_op->op_private |= OPpENTERSUB_DB;
1827 EXTEND(SP, notfound + 5);
1828 PUSHs(lr>0? right: left);
1829 PUSHs(lr>0? left: right);
1830 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1832 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1837 if ((PL_op = Perl_pp_entersub(aTHX)))
1845 CATCH_SET(oldcatch);
1852 ans=SvIV(res)<=0; break;
1855 ans=SvIV(res)<0; break;
1858 ans=SvIV(res)>=0; break;
1861 ans=SvIV(res)>0; break;
1864 ans=SvIV(res)==0; break;
1867 ans=SvIV(res)!=0; break;
1870 SvSetSV(left,res); return left;
1872 ans=!SvTRUE(res); break;
1877 } else if (method==copy_amg) {
1879 Perl_croak(aTHX_ "Copy method did not return a reference");
1881 return SvREFCNT_inc(SvRV(res));
1889 =for apidoc is_gv_magical_sv
1891 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
1897 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
1900 const char * const temp = SvPV_const(name, len);
1901 return is_gv_magical(temp, len, flags);
1905 =for apidoc is_gv_magical
1907 Returns C<TRUE> if given the name of a magical GV.
1909 Currently only useful internally when determining if a GV should be
1910 created even in rvalue contexts.
1912 C<flags> is not used at present but available for future extension to
1913 allow selecting particular classes of magical variable.
1915 Currently assumes that C<name> is NUL terminated (as well as len being valid).
1916 This assumption is met by all callers within the perl core, which all pass
1917 pointers returned by SvPV.
1922 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
1924 PERL_UNUSED_ARG(flags);
1927 const char * const name1 = name + 1;
1930 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
1934 if (len == 8 && strEQ(name1, "VERLOAD"))
1938 if (len == 3 && name[1] == 'I' && name[2] == 'G')
1941 /* Using ${^...} variables is likely to be sufficiently rare that
1942 it seems sensible to avoid the space hit of also checking the
1944 case '\017': /* ${^OPEN} */
1945 if (strEQ(name1, "PEN"))
1948 case '\024': /* ${^TAINT} */
1949 if (strEQ(name1, "AINT"))
1952 case '\025': /* ${^UNICODE} */
1953 if (strEQ(name1, "NICODE"))
1955 if (strEQ(name1, "TF8LOCALE"))
1958 case '\027': /* ${^WARNING_BITS} */
1959 if (strEQ(name1, "ARNING_BITS"))
1972 const char *end = name + len;
1973 while (--end > name) {
1981 /* Because we're already assuming that name is NUL terminated
1982 below, we can treat an empty name as "\0" */
2009 case '\001': /* $^A */
2010 case '\003': /* $^C */
2011 case '\004': /* $^D */
2012 case '\005': /* $^E */
2013 case '\006': /* $^F */
2014 case '\010': /* $^H */
2015 case '\011': /* $^I, NOT \t in EBCDIC */
2016 case '\014': /* $^L */
2017 case '\016': /* $^N */
2018 case '\017': /* $^O */
2019 case '\020': /* $^P */
2020 case '\023': /* $^S */
2021 case '\024': /* $^T */
2022 case '\026': /* $^V */
2023 case '\027': /* $^W */
2044 * c-indentation-style: bsd
2046 * indent-tabs-mode: t
2049 * ex: set ts=8 sts=4 sw=4 noet: