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 (void) start_subparse(0,0); /* Create empty 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;
305 SV* const sv = *svp++;
306 HV* const 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) {
323 HV* const 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_autoload
402 Returns the glob which contains the subroutine to call to invoke the method
403 on the C<stash>. In fact in the presence of autoloading this may be the
404 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
407 The third parameter of C<gv_fetchmethod_autoload> determines whether
408 AUTOLOAD lookup is performed if the given method is not present: non-zero
409 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
410 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
411 with a non-zero C<autoload> parameter.
413 These functions grant C<"SUPER"> token as a prefix of the method name. Note
414 that if you want to keep the returned glob for a long time, you need to
415 check for it being "AUTOLOAD", since at the later time the call may load a
416 different subroutine due to $AUTOLOAD changing its value. Use the glob
417 created via a side effect to do this.
419 These functions have the same side-effects and as C<gv_fetchmeth> with
420 C<level==0>. C<name> should be writable if contains C<':'> or C<'
421 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
422 C<call_sv> apply equally to these functions.
428 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
430 register const char *nend;
431 const char *nsplit = 0;
435 if (stash && SvTYPE(stash) < SVt_PVHV)
438 for (nend = name; *nend; nend++) {
441 else if (*nend == ':' && *(nend + 1) == ':')
445 const char * const origname = name;
449 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
450 /* ->SUPER::method should really be looked up in original stash */
451 SV *tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
452 CopSTASHPV(PL_curcop)));
453 /* __PACKAGE__::SUPER stash should be autovivified */
454 stash = gv_stashpvn(SvPVX_const(tmpstr), SvCUR(tmpstr), TRUE);
455 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
456 origname, HvNAME_get(stash), name) );
459 /* don't autovifify if ->NoSuchStash::method */
460 stash = gv_stashpvn(origname, nsplit - origname, FALSE);
462 /* however, explicit calls to Pkg::SUPER::method may
463 happen, and may require autovivification to work */
464 if (!stash && (nsplit - origname) >= 7 &&
465 strnEQ(nsplit - 7, "::SUPER", 7) &&
466 gv_stashpvn(origname, nsplit - origname - 7, FALSE))
467 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
472 gv = gv_fetchmeth(stash, name, nend - name, 0);
474 if (strEQ(name,"import") || strEQ(name,"unimport"))
475 gv = (GV*)&PL_sv_yes;
477 gv = gv_autoload4(ostash, name, nend - name, TRUE);
480 CV* const cv = GvCV(gv);
481 if (!CvROOT(cv) && !CvXSUB(cv)) {
489 if (GvCV(stubgv) != cv) /* orphaned import */
492 autogv = gv_autoload4(GvSTASH(stubgv),
493 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
503 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
511 const char *packname = "";
514 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
517 if (SvTYPE(stash) < SVt_PVHV) {
518 packname = SvPV_const((SV*)stash, packname_len);
522 packname = HvNAME_get(stash);
523 packname_len = HvNAMELEN_get(stash);
526 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
530 if (!(CvROOT(cv) || CvXSUB(cv)))
534 * Inheriting AUTOLOAD for non-methods works ... for now.
536 if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
537 && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)
539 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
540 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
541 packname, (int)len, name);
544 /* rather than lookup/init $AUTOLOAD here
545 * only to have the XSUB do another lookup for $AUTOLOAD
546 * and split that value on the last '::',
547 * pass along the same data via some unused fields in the CV
550 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
556 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
557 * The subroutine's original name may not be "AUTOLOAD", so we don't
558 * use that, but for lack of anything better we will use the sub's
559 * original package to look up $AUTOLOAD.
561 varstash = GvSTASH(CvGV(cv));
562 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
566 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
567 #ifdef PERL_DONT_CREATE_GVSV
568 GvSV(vargv) = NEWSV(72,0);
572 varsv = GvSVn(vargv);
573 sv_setpvn(varsv, packname, packname_len);
574 sv_catpvn(varsv, "::", 2);
575 sv_catpvn(varsv, name, len);
576 SvTAINTED_off(varsv);
580 /* The "gv" parameter should be the glob known to Perl code as *!
581 * The scalar must already have been magicalized.
584 S_require_errno(pTHX_ GV *gv)
587 HV* stash = gv_stashpvn("Errno",5,FALSE);
589 if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
593 save_scalar(gv); /* keep the value of $! */
594 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
595 newSVpvn("Errno",5), Nullsv);
598 stash = gv_stashpvn("Errno",5,FALSE);
599 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
600 Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available");
605 =for apidoc gv_stashpv
607 Returns a pointer to the stash for a specified package. C<name> should
608 be a valid UTF-8 string and must be null-terminated. If C<create> is set
609 then the package will be created if it does not already exist. If C<create>
610 is not set and the package does not exist then NULL is returned.
616 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
618 return gv_stashpvn(name, strlen(name), create);
622 =for apidoc gv_stashpvn
624 Returns a pointer to the stash for a specified package. C<name> should
625 be a valid UTF-8 string. The C<namelen> parameter indicates the length of
626 the C<name>, in bytes. If C<create> is set then the package will be
627 created if it does not already exist. If C<create> is not set and the
628 package does not exist then NULL is returned.
634 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
641 if (namelen + 3 < sizeof smallbuf)
644 Newx(tmpbuf, namelen + 3, char);
645 Copy(name,tmpbuf,namelen,char);
646 tmpbuf[namelen++] = ':';
647 tmpbuf[namelen++] = ':';
648 tmpbuf[namelen] = '\0';
649 tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV);
650 if (tmpbuf != smallbuf)
655 GvHV(tmpgv) = newHV();
657 if (!HvNAME_get(stash))
658 hv_name_set(stash, name, namelen, 0);
663 =for apidoc gv_stashsv
665 Returns a pointer to the stash for a specified package, which must be a
666 valid UTF-8 string. See C<gv_stashpv>.
672 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
675 const char * const ptr = SvPV_const(sv,len);
676 return gv_stashpvn(ptr, len, create);
681 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
682 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
686 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
688 const char * const nambeg = SvPV_const(name, len);
689 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
693 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
696 register const char *name = nambeg;
700 register const char *namend;
702 const I32 add = flags & ~SVf_UTF8;
704 PERL_UNUSED_ARG(full_len);
706 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
709 for (namend = name; *namend; namend++) {
710 if ((*namend == ':' && namend[1] == ':')
711 || (*namend == '\'' && namend[1]))
715 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
723 if (len + 3 < sizeof (smallbuf))
726 Newx(tmpbuf, len+3, char);
727 Copy(name, tmpbuf, len, char);
731 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
732 gv = gvp ? *gvp : Nullgv;
733 if (gv && gv != (GV*)&PL_sv_undef) {
734 if (SvTYPE(gv) != SVt_PVGV)
735 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
739 if (tmpbuf != smallbuf)
741 if (!gv || gv == (GV*)&PL_sv_undef)
744 if (!(stash = GvHV(gv)))
745 stash = GvHV(gv) = newHV();
747 if (!HvNAME_get(stash))
748 hv_name_set(stash, nambeg, namend - nambeg, 0);
756 return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE);
761 /* No stash in name, so see how we can default */
764 if (isIDFIRST_lazy(name)) {
767 /* name is always \0 terminated, and initial \0 wouldn't return
768 true from isIDFIRST_lazy, so we know that name[1] is defined */
775 if (strEQ(name, "INC") || strEQ(name, "ENV"))
779 if (strEQ(name, "SIG"))
783 if (strEQ(name, "STDIN") || strEQ(name, "STDOUT") ||
784 strEQ(name, "STDERR"))
788 if (strEQ(name, "ARGV") || strEQ(name, "ARGVOUT"))
795 else if (IN_PERL_COMPILETIME) {
797 if (add && (PL_hints & HINT_STRICT_VARS) &&
798 sv_type != SVt_PVCV &&
799 sv_type != SVt_PVGV &&
800 sv_type != SVt_PVFM &&
801 sv_type != SVt_PVIO &&
802 !(len == 1 && sv_type == SVt_PV &&
803 (*name == 'a' || *name == 'b')) )
805 gvp = (GV**)hv_fetch(stash,name,len,0);
807 *gvp == (GV*)&PL_sv_undef ||
808 SvTYPE(*gvp) != SVt_PVGV)
812 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
813 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
814 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
816 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
817 sv_type == SVt_PVAV ? '@' :
818 sv_type == SVt_PVHV ? '%' : '$',
821 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
827 stash = CopSTASH(PL_curcop);
833 /* By this point we should have a stash and a name */
837 SV * const err = Perl_mess(aTHX_
838 "Global symbol \"%s%s\" requires explicit package name",
839 (sv_type == SVt_PV ? "$"
840 : sv_type == SVt_PVAV ? "@"
841 : sv_type == SVt_PVHV ? "%"
843 if (USE_UTF8_IN_NAMES)
846 stash = GvHV(gv_fetchpv("<none>::", GV_ADDMULTI, SVt_PVHV));
852 if (!SvREFCNT(stash)) /* symbol table under destruction */
855 gvp = (GV**)hv_fetch(stash,name,len,add);
856 if (!gvp || *gvp == (GV*)&PL_sv_undef)
859 if (SvTYPE(gv) == SVt_PVGV) {
862 gv_init_sv(gv, sv_type);
863 if (*name=='!' && sv_type == SVt_PVHV && len==1)
867 } else if (add & GV_NOINIT) {
871 /* Adding a new symbol */
873 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
874 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
875 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
876 gv_init_sv(gv, sv_type);
878 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
879 : (PL_dowarn & G_WARN_ON ) ) )
882 /* set up magic where warranted */
886 /* Nothing else to do.
887 The compiler will probably turn the switch statement into a
888 branch table. Make sure we avoid even that small overhead for
889 the common case of lower case variable names. */
893 const char * const name2 = name + 1;
896 if (strEQ(name2, "RGV")) {
897 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
901 if (strnEQ(name2, "XPORT", 5))
905 if (strEQ(name2, "SA")) {
906 AV* const av = GvAVn(gv);
908 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, Nullch, 0);
909 /* NOTE: No support for tied ISA */
910 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
911 && AvFILLp(av) == -1)
914 av_push(av, newSVpvn(pname = "NDBM_File",9));
915 gv_stashpvn(pname, 9, TRUE);
916 av_push(av, newSVpvn(pname = "DB_File",7));
917 gv_stashpvn(pname, 7, TRUE);
918 av_push(av, newSVpvn(pname = "GDBM_File",9));
919 gv_stashpvn(pname, 9, TRUE);
920 av_push(av, newSVpvn(pname = "SDBM_File",9));
921 gv_stashpvn(pname, 9, TRUE);
922 av_push(av, newSVpvn(pname = "ODBM_File",9));
923 gv_stashpvn(pname, 9, TRUE);
928 if (strEQ(name2, "VERLOAD")) {
929 HV* const hv = GvHVn(gv);
931 hv_magic(hv, Nullgv, PERL_MAGIC_overload);
935 if (strEQ(name2, "IG")) {
939 Newxz(PL_psig_ptr, SIG_SIZE, SV*);
940 Newxz(PL_psig_name, SIG_SIZE, SV*);
941 Newxz(PL_psig_pend, SIG_SIZE, int);
945 hv_magic(hv, Nullgv, PERL_MAGIC_sig);
946 for (i = 1; i < SIG_SIZE; i++) {
947 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
949 sv_setsv(*init, &PL_sv_undef);
957 if (strEQ(name2, "ERSION"))
960 case '\003': /* $^CHILD_ERROR_NATIVE */
961 if (strEQ(name2, "HILD_ERROR_NATIVE"))
964 case '\005': /* $^ENCODING */
965 if (strEQ(name2, "NCODING"))
968 case '\017': /* $^OPEN */
969 if (strEQ(name2, "PEN"))
972 case '\024': /* ${^TAINT} */
973 if (strEQ(name2, "AINT"))
976 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
977 if (strEQ(name2, "NICODE"))
979 if (strEQ(name2, "TF8LOCALE"))
982 case '\027': /* $^WARNING_BITS */
983 if (strEQ(name2, "ARNING_BITS"))
996 /* ensures variable is only digits */
997 /* ${"1foo"} fails this test (and is thus writeable) */
998 /* added by japhy, but borrowed from is_gv_magical */
999 const char *end = name + len;
1000 while (--end > name) {
1001 if (!isDIGIT(*end)) return gv;
1008 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1009 be case '\0' in this switch statement (ie a default case) */
1015 sv_type == SVt_PVAV ||
1016 sv_type == SVt_PVHV ||
1017 sv_type == SVt_PVCV ||
1018 sv_type == SVt_PVFM ||
1021 PL_sawampersand = TRUE;
1025 sv_setpv(GvSVn(gv),PL_chopset);
1029 #ifdef COMPLEX_STATUS
1030 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1036 /* If %! has been used, automatically load Errno.pm.
1037 The require will itself set errno, so in order to
1038 preserve its value we have to set up the magic
1039 now (rather than going to magicalize)
1042 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1044 if (sv_type == SVt_PVHV)
1050 AV* const av = GvAVn(gv);
1051 sv_magic((SV*)av, Nullsv, PERL_MAGIC_regdata, Nullch, 0);
1057 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1058 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1059 "$%c is no longer supported", *name);
1062 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1067 AV* const av = GvAVn(gv);
1068 sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, Nullch, 0);
1072 case '\023': /* $^S */
1083 SvREADONLY_on(GvSVn(gv));
1098 case '\001': /* $^A */
1099 case '\003': /* $^C */
1100 case '\004': /* $^D */
1101 case '\005': /* $^E */
1102 case '\006': /* $^F */
1103 case '\010': /* $^H */
1104 case '\011': /* $^I, NOT \t in EBCDIC */
1105 case '\016': /* $^N */
1106 case '\017': /* $^O */
1107 case '\020': /* $^P */
1108 case '\024': /* $^T */
1109 case '\027': /* $^W */
1111 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1114 case '\014': /* $^L */
1115 sv_setpvn(GvSVn(gv),"\f",1);
1116 PL_formfeed = GvSVn(gv);
1119 sv_setpvn(GvSVn(gv),"\034",1);
1123 SV * const sv = GvSVn(gv);
1124 if (!sv_derived_from(PL_patchlevel, "version"))
1125 (void *)upg_version(PL_patchlevel);
1126 GvSV(gv) = vnumify(PL_patchlevel);
1127 SvREADONLY_on(GvSV(gv));
1131 case '\026': /* $^V */
1133 SV * const sv = GvSVn(gv);
1134 GvSV(gv) = new_version(PL_patchlevel);
1135 SvREADONLY_on(GvSV(gv));
1145 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1149 const HV * const hv = GvSTASH(gv);
1154 sv_setpv(sv, prefix ? prefix : "");
1156 name = HvNAME_get(hv);
1158 namelen = HvNAMELEN_get(hv);
1164 if (keepmain || strNE(name, "main")) {
1165 sv_catpvn(sv,name,namelen);
1166 sv_catpvn(sv,"::", 2);
1168 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1172 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1174 const GV * const egv = GvEGV(gv);
1175 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1182 IO * const io = (IO*)NEWSV(0,0);
1184 sv_upgrade((SV *)io,SVt_PVIO);
1185 /* This used to read SvREFCNT(io) = 1;
1186 It's not clear why the reference count needed an explicit reset. NWC
1188 assert (SvREFCNT(io) == 1);
1190 /* Clear the stashcache because a new IO could overrule a package name */
1191 hv_clear(PL_stashcache);
1192 iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV);
1193 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1194 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1195 iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV);
1196 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1201 Perl_gv_check(pTHX_ HV *stash)
1205 if (!HvARRAY(stash))
1207 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1209 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1212 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1213 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1215 if (hv != PL_defstash && hv != stash)
1216 gv_check(hv); /* nested package */
1218 else if (isALPHA(*HeKEY(entry))) {
1220 gv = (GV*)HeVAL(entry);
1221 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1224 /* performance hack: if filename is absolute and it's a standard
1225 * module, don't bother warning */
1226 #ifdef MACOS_TRADITIONAL
1227 # define LIB_COMPONENT ":lib:"
1229 # define LIB_COMPONENT "/lib/"
1232 && PERL_FILE_IS_ABSOLUTE(file)
1233 && (instr(file, LIB_COMPONENT) || instr(file, ".pm")))
1237 CopLINE_set(PL_curcop, GvLINE(gv));
1239 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1241 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1243 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1244 "Name \"%s::%s\" used only once: possible typo",
1245 HvNAME_get(stash), GvNAME(gv));
1252 Perl_newGVgen(pTHX_ const char *pack)
1254 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1258 /* hopefully this is only called on local symbol table entries */
1261 Perl_gp_ref(pTHX_ GP *gp)
1268 /* multi-named GPs cannot be used for method cache */
1269 SvREFCNT_dec(gp->gp_cv);
1274 /* Adding a new name to a subroutine invalidates method cache */
1275 PL_sub_generation++;
1282 Perl_gp_free(pTHX_ GV *gv)
1286 if (!gv || !(gp = GvGP(gv)))
1288 if (gp->gp_refcnt == 0) {
1289 if (ckWARN_d(WARN_INTERNAL))
1290 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1291 "Attempt to free unreferenced glob pointers"
1292 pTHX__FORMAT pTHX__VALUE);
1296 /* Deleting the name of a subroutine invalidates method cache */
1297 PL_sub_generation++;
1299 if (--gp->gp_refcnt > 0) {
1300 if (gp->gp_egv == gv)
1305 if (gp->gp_sv) SvREFCNT_dec(gp->gp_sv);
1306 if (gp->gp_av) SvREFCNT_dec(gp->gp_av);
1307 /* FIXME - another reference loop GV -> symtab -> GV ?
1308 Somehow gp->gp_hv can end up pointing at freed garbage. */
1309 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1310 const char *hvname = HvNAME_get(gp->gp_hv);
1311 if (PL_stashcache && hvname)
1312 hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv),
1314 SvREFCNT_dec(gp->gp_hv);
1316 if (gp->gp_io) SvREFCNT_dec(gp->gp_io);
1317 if (gp->gp_cv) SvREFCNT_dec(gp->gp_cv);
1318 if (gp->gp_form) SvREFCNT_dec(gp->gp_form);
1325 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1327 AMT * const amtp = (AMT*)mg->mg_ptr;
1328 PERL_UNUSED_ARG(sv);
1330 if (amtp && AMT_AMAGIC(amtp)) {
1332 for (i = 1; i < NofAMmeth; i++) {
1333 CV * const cv = amtp->table[i];
1335 SvREFCNT_dec((SV *) cv);
1336 amtp->table[i] = Nullcv;
1343 /* Updates and caches the CV's */
1346 Perl_Gv_AMupdate(pTHX_ HV *stash)
1348 MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1349 AMT * const amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
1352 if (mg && amtp->was_ok_am == PL_amagic_generation
1353 && amtp->was_ok_sub == PL_sub_generation)
1354 return (bool)AMT_OVERLOADED(amtp);
1355 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1357 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1360 amt.was_ok_am = PL_amagic_generation;
1361 amt.was_ok_sub = PL_sub_generation;
1362 amt.fallback = AMGfallNO;
1366 int filled = 0, have_ovl = 0;
1369 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1371 /* Try to find via inheritance. */
1372 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1373 SV * const sv = gv ? GvSV(gv) : NULL;
1377 lim = DESTROY_amg; /* Skip overloading entries. */
1378 #ifdef PERL_DONT_CREATE_GVSV
1380 /* Equivalent to !SvTRUE and !SvOK */
1383 else if (SvTRUE(sv))
1384 amt.fallback=AMGfallYES;
1386 amt.fallback=AMGfallNEVER;
1388 for (i = 1; i < lim; i++)
1389 amt.table[i] = Nullcv;
1390 for (; i < NofAMmeth; i++) {
1391 const char *cooky = PL_AMG_names[i];
1392 /* Human-readable form, for debugging: */
1393 const char *cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1394 const STRLEN l = strlen(cooky);
1396 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1397 cp, HvNAME_get(stash)) );
1398 /* don't fill the cache while looking up!
1399 Creation of inheritance stubs in intermediate packages may
1400 conflict with the logic of runtime method substitution.
1401 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1402 then we could have created stubs for "(+0" in A and C too.
1403 But if B overloads "bool", we may want to use it for
1404 numifying instead of C's "+0". */
1405 if (i >= DESTROY_amg)
1406 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1407 else /* Autoload taken care of below */
1408 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1410 if (gv && (cv = GvCV(gv))) {
1412 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1413 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1414 /* This is a hack to support autoloading..., while
1415 knowing *which* methods were declared as overloaded. */
1416 /* GvSV contains the name of the method. */
1418 SV *gvsv = GvSV(gv);
1420 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1421 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1422 GvSV(gv), cp, hvname) );
1423 if (!gvsv || !SvPOK(gvsv)
1424 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1427 /* Can be an import stub (created by "can"). */
1428 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1429 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1430 "in package \"%.256s\"",
1431 (GvCVGEN(gv) ? "Stub found while resolving"
1435 cv = GvCV(gv = ngv);
1437 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1438 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1439 GvNAME(CvGV(cv))) );
1441 if (i < DESTROY_amg)
1443 } else if (gv) { /* Autoloaded... */
1447 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1450 AMT_AMAGIC_on(&amt);
1452 AMT_OVERLOADED_on(&amt);
1453 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1454 (char*)&amt, sizeof(AMT));
1458 /* Here we have no table: */
1460 AMT_AMAGIC_off(&amt);
1461 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1462 (char*)&amt, sizeof(AMTS));
1468 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1473 if (!stash || !HvNAME_get(stash))
1475 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1479 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1481 amtp = (AMT*)mg->mg_ptr;
1482 if ( amtp->was_ok_am != PL_amagic_generation
1483 || amtp->was_ok_sub != PL_sub_generation )
1485 if (AMT_AMAGIC(amtp)) {
1486 CV * const ret = amtp->table[id];
1487 if (ret && isGV(ret)) { /* Autoloading stab */
1488 /* Passing it through may have resulted in a warning
1489 "Inherited AUTOLOAD for a non-method deprecated", since
1490 our caller is going through a function call, not a method call.
1491 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1492 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1505 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1510 CV **cvp=NULL, **ocvp=NULL;
1511 AMT *amtp=NULL, *oamtp=NULL;
1512 int off = 0, off1, lr = 0, notfound = 0;
1513 int postpr = 0, force_cpy = 0;
1514 int assign = AMGf_assign & flags;
1515 const int assignshift = assign ? 1 : 0;
1520 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1521 && (stash = SvSTASH(SvRV(left)))
1522 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1523 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1524 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1526 && ((cv = cvp[off=method+assignshift])
1527 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1533 cv = cvp[off=method])))) {
1534 lr = -1; /* Call method for left argument */
1536 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1539 /* look for substituted methods */
1540 /* In all the covered cases we should be called with assign==0. */
1544 if ((cv = cvp[off=add_ass_amg])
1545 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1546 right = &PL_sv_yes; lr = -1; assign = 1;
1551 if ((cv = cvp[off = subtr_ass_amg])
1552 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1553 right = &PL_sv_yes; lr = -1; assign = 1;
1557 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1560 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1563 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1566 (void)((cv = cvp[off=bool__amg])
1567 || (cv = cvp[off=numer_amg])
1568 || (cv = cvp[off=string_amg]));
1574 * SV* ref causes confusion with the interpreter variable of
1577 SV* const tmpRef=SvRV(left);
1578 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1580 * Just to be extra cautious. Maybe in some
1581 * additional cases sv_setsv is safe, too.
1583 SV* const newref = newSVsv(tmpRef);
1584 SvOBJECT_on(newref);
1585 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1591 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1592 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1593 SV* const nullsv=sv_2mortal(newSViv(0));
1595 SV* const lessp = amagic_call(left,nullsv,
1596 lt_amg,AMGf_noright);
1597 logic = SvTRUE(lessp);
1599 SV* const lessp = amagic_call(left,nullsv,
1600 ncmp_amg,AMGf_noright);
1601 logic = (SvNV(lessp) < 0);
1604 if (off==subtr_amg) {
1615 if ((cv = cvp[off=subtr_amg])) {
1617 left = sv_2mortal(newSViv(0));
1622 case iter_amg: /* XXXX Eventually should do to_gv. */
1624 return NULL; /* Delegate operation to standard mechanisms. */
1632 return left; /* Delegate operation to standard mechanisms. */
1637 if (!cv) goto not_found;
1638 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1639 && (stash = SvSTASH(SvRV(right)))
1640 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1641 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1642 ? (amtp = (AMT*)mg->mg_ptr)->table
1644 && (cv = cvp[off=method])) { /* Method for right
1647 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1648 && (cvp=ocvp) && (lr = -1))
1649 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1650 && !(flags & AMGf_unary)) {
1651 /* We look for substitution for
1652 * comparison operations and
1654 if (method==concat_amg || method==concat_ass_amg
1655 || method==repeat_amg || method==repeat_ass_amg) {
1656 return NULL; /* Delegate operation to string conversion */
1666 postpr = 1; off=ncmp_amg; break;
1673 postpr = 1; off=scmp_amg; break;
1675 if (off != -1) cv = cvp[off];
1680 not_found: /* No method found, either report or croak */
1688 return left; /* Delegate operation to standard mechanisms. */
1691 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1692 notfound = 1; lr = -1;
1693 } else if (cvp && (cv=cvp[nomethod_amg])) {
1694 notfound = 1; lr = 1;
1697 if (off==-1) off=method;
1698 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1699 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1700 AMG_id2name(method + assignshift),
1701 (flags & AMGf_unary ? " " : "\n\tleft "),
1703 "in overloaded package ":
1704 "has no overloaded magic",
1706 HvNAME_get(SvSTASH(SvRV(left))):
1709 ",\n\tright argument in overloaded package ":
1712 : ",\n\tright argument has no overloaded magic"),
1714 HvNAME_get(SvSTASH(SvRV(right))):
1716 if (amtp && amtp->fallback >= AMGfallYES) {
1717 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1719 Perl_croak(aTHX_ "%"SVf, msg);
1723 force_cpy = force_cpy || assign;
1728 DEBUG_o(Perl_deb(aTHX_
1729 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1731 method+assignshift==off? "" :
1733 method+assignshift==off? "" :
1734 AMG_id2name(method+assignshift),
1735 method+assignshift==off? "" : "\")",
1736 flags & AMGf_unary? "" :
1737 lr==1 ? " for right argument": " for left argument",
1738 flags & AMGf_unary? " for argument" : "",
1739 stash ? HvNAME_get(stash) : "null",
1740 fl? ",\n\tassignment variant used": "") );
1743 /* Since we use shallow copy during assignment, we need
1744 * to dublicate the contents, probably calling user-supplied
1745 * version of copy operator
1747 /* We need to copy in following cases:
1748 * a) Assignment form was called.
1749 * assignshift==1, assign==T, method + 1 == off
1750 * b) Increment or decrement, called directly.
1751 * assignshift==0, assign==0, method + 0 == off
1752 * c) Increment or decrement, translated to assignment add/subtr.
1753 * assignshift==0, assign==T,
1755 * d) Increment or decrement, translated to nomethod.
1756 * assignshift==0, assign==0,
1758 * e) Assignment form translated to nomethod.
1759 * assignshift==1, assign==T, method + 1 != off
1762 /* off is method, method+assignshift, or a result of opcode substitution.
1763 * In the latter case assignshift==0, so only notfound case is important.
1765 if (( (method + assignshift == off)
1766 && (assign || (method == inc_amg) || (method == dec_amg)))
1773 const bool oldcatch = CATCH_GET;
1776 Zero(&myop, 1, BINOP);
1777 myop.op_last = (OP *) &myop;
1778 myop.op_next = Nullop;
1779 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1781 PUSHSTACKi(PERLSI_OVERLOAD);
1784 PL_op = (OP *) &myop;
1785 if (PERLDB_SUB && PL_curstash != PL_debstash)
1786 PL_op->op_private |= OPpENTERSUB_DB;
1790 EXTEND(SP, notfound + 5);
1791 PUSHs(lr>0? right: left);
1792 PUSHs(lr>0? left: right);
1793 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1795 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1800 if ((PL_op = Perl_pp_entersub(aTHX)))
1808 CATCH_SET(oldcatch);
1815 ans=SvIV(res)<=0; break;
1818 ans=SvIV(res)<0; break;
1821 ans=SvIV(res)>=0; break;
1824 ans=SvIV(res)>0; break;
1827 ans=SvIV(res)==0; break;
1830 ans=SvIV(res)!=0; break;
1833 SvSetSV(left,res); return left;
1835 ans=!SvTRUE(res); break;
1840 } else if (method==copy_amg) {
1842 Perl_croak(aTHX_ "Copy method did not return a reference");
1844 return SvREFCNT_inc(SvRV(res));
1852 =for apidoc is_gv_magical_sv
1854 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
1860 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
1863 const char * const temp = SvPV_const(name, len);
1864 return is_gv_magical(temp, len, flags);
1868 =for apidoc is_gv_magical
1870 Returns C<TRUE> if given the name of a magical GV.
1872 Currently only useful internally when determining if a GV should be
1873 created even in rvalue contexts.
1875 C<flags> is not used at present but available for future extension to
1876 allow selecting particular classes of magical variable.
1878 Currently assumes that C<name> is NUL terminated (as well as len being valid).
1879 This assumption is met by all callers within the perl core, which all pass
1880 pointers returned by SvPV.
1885 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
1887 PERL_UNUSED_ARG(flags);
1890 const char * const name1 = name + 1;
1893 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
1897 if (len == 8 && strEQ(name1, "VERLOAD"))
1901 if (len == 3 && name[1] == 'I' && name[2] == 'G')
1904 /* Using ${^...} variables is likely to be sufficiently rare that
1905 it seems sensible to avoid the space hit of also checking the
1907 case '\017': /* ${^OPEN} */
1908 if (strEQ(name1, "PEN"))
1911 case '\024': /* ${^TAINT} */
1912 if (strEQ(name1, "AINT"))
1915 case '\025': /* ${^UNICODE} */
1916 if (strEQ(name1, "NICODE"))
1918 if (strEQ(name1, "TF8LOCALE"))
1921 case '\027': /* ${^WARNING_BITS} */
1922 if (strEQ(name1, "ARNING_BITS"))
1935 const char *end = name + len;
1936 while (--end > name) {
1944 /* Because we're already assuming that name is NUL terminated
1945 below, we can treat an empty name as "\0" */
1972 case '\001': /* $^A */
1973 case '\003': /* $^C */
1974 case '\004': /* $^D */
1975 case '\005': /* $^E */
1976 case '\006': /* $^F */
1977 case '\010': /* $^H */
1978 case '\011': /* $^I, NOT \t in EBCDIC */
1979 case '\014': /* $^L */
1980 case '\016': /* $^N */
1981 case '\017': /* $^O */
1982 case '\020': /* $^P */
1983 case '\023': /* $^S */
1984 case '\024': /* $^T */
1985 case '\026': /* $^V */
1986 case '\027': /* $^W */
2007 * c-indentation-style: bsd
2009 * indent-tabs-mode: t
2012 * ex: set ts=8 sts=4 sw=4 noet: