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 $foo, @foo, %foo.
27 GVs are usually found as values in stashes (symbol table hashes) where
28 Perl stores its global variables.
37 static const char S_autoload[] = "AUTOLOAD";
38 static const STRLEN S_autolen = sizeof(S_autoload)-1;
41 Perl_gv_AVadd(pTHX_ register GV *gv)
43 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
44 Perl_croak(aTHX_ "Bad symbol for array");
51 Perl_gv_HVadd(pTHX_ register GV *gv)
53 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
54 Perl_croak(aTHX_ "Bad symbol for hash");
61 Perl_gv_IOadd(pTHX_ register GV *gv)
63 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
64 Perl_croak(aTHX_ "Bad symbol for filehandle");
66 #ifdef GV_UNIQUE_CHECK
68 Perl_croak(aTHX_ "Bad symbol for filehandle (GV is unique)");
77 Perl_gv_fetchfile(pTHX_ const char *name)
87 tmplen = strlen(name) + 2;
88 if (tmplen < sizeof smallbuf)
91 New(603, tmpbuf, tmplen + 1, char);
92 /* This is where the debugger's %{"::_<$filename"} hash is created */
95 strcpy(tmpbuf + 2, name);
96 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
98 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
99 sv_setpv(GvSV(gv), name);
101 hv_magic(GvHVn(gv_AVadd(gv)), Nullgv, PERL_MAGIC_dbfile);
103 if (tmpbuf != smallbuf)
109 Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
113 const bool doproto = SvTYPE(gv) > SVt_NULL;
114 const char * const proto = (doproto && SvPOK(gv)) ? SvPVX_const(gv) : NULL;
116 sv_upgrade((SV*)gv, SVt_PVGV);
123 Safefree(SvPVX_const(gv));
125 Newz(602, gp, 1, GP);
126 GvGP(gv) = gp_ref(gp);
127 GvSV(gv) = NEWSV(72,0);
128 GvLINE(gv) = CopLINE(PL_curcop);
129 /* XXX Ideally this cast would be replaced with a change to const char*
131 GvFILE(gv) = CopFILE(PL_curcop) ? CopFILE(PL_curcop) : (char *) "";
134 sv_magic((SV*)gv, (SV*)gv, PERL_MAGIC_glob, Nullch, 0);
135 GvSTASH(gv) = (HV*)SvREFCNT_inc(stash);
136 GvNAME(gv) = savepvn(name, len);
138 if (multi || doproto) /* doproto means it _was_ mentioned */
140 if (doproto) { /* Replicate part of newSUB here. */
143 /* XXX unsafe for threads if eval_owner isn't held */
144 start_subparse(0,0); /* Create CV in compcv. */
145 GvCV(gv) = PL_compcv;
150 CvFILE_set_from_cop(GvCV(gv), PL_curcop);
151 CvSTASH(GvCV(gv)) = PL_curstash;
153 sv_setpv((SV*)GvCV(gv), proto);
160 S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
176 =for apidoc gv_fetchmeth
178 Returns the glob with the given C<name> and a defined subroutine or
179 C<NULL>. The glob lives in the given C<stash>, or in the stashes
180 accessible via @ISA and UNIVERSAL::.
182 The argument C<level> should be either 0 or -1. If C<level==0>, as a
183 side-effect creates a glob with the given C<name> in the given C<stash>
184 which in the case of success contains an alias for the subroutine, and sets
185 up caching info for this glob. Similarly for all the searched stashes.
187 This function grants C<"SUPER"> token as a postfix of the stash name. The
188 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
189 visible to Perl code. So when calling C<call_sv>, you should not use
190 the GV directly; instead, you should use the method's CV, which can be
191 obtained from the GV with the C<GvCV> macro.
197 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
206 /* UNIVERSAL methods should be callable without a stash */
208 level = -1; /* probably appropriate */
209 if(!(stash = gv_stashpvn("UNIVERSAL", 9, FALSE)))
213 hvname = HvNAME_get(stash);
216 "Can't use anonymous symbol table for method lookup");
218 if ((level > 100) || (level < -100))
219 Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
222 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
224 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
229 if (SvTYPE(topgv) != SVt_PVGV)
230 gv_init(topgv, stash, name, len, TRUE);
231 if ((cv = GvCV(topgv))) {
232 /* If genuine method or valid cache entry, use it */
233 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
235 /* Stale cached entry: junk it */
237 GvCV(topgv) = cv = Nullcv;
240 else if (GvCVGEN(topgv) == PL_sub_generation)
241 return 0; /* cache indicates sub doesn't exist */
244 gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE);
245 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : Nullav;
247 /* create and re-create @.*::SUPER::ISA on demand */
248 if (!av || !SvMAGIC(av)) {
249 /* FIXME - get this from the symtab magic. */
250 STRLEN packlen = strlen(hvname);
252 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
256 basestash = gv_stashpvn(hvname, packlen, TRUE);
257 gvp = (GV**)hv_fetch(basestash, "ISA", 3, FALSE);
258 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
259 gvp = (GV**)hv_fetch(stash, "ISA", 3, TRUE);
260 if (!gvp || !(gv = *gvp))
261 Perl_croak(aTHX_ "Cannot create %s::ISA", hvname);
262 if (SvTYPE(gv) != SVt_PVGV)
263 gv_init(gv, stash, "ISA", 3, TRUE);
264 SvREFCNT_dec(GvAV(gv));
265 GvAV(gv) = (AV*)SvREFCNT_inc(av);
271 SV** svp = AvARRAY(av);
272 /* NOTE: No support for tied ISA */
273 I32 items = AvFILLp(av) + 1;
276 HV* basestash = gv_stashsv(sv, FALSE);
278 if (ckWARN(WARN_MISC))
279 Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
283 gv = gv_fetchmeth(basestash, name, len,
284 (level >= 0) ? level + 1 : level - 1);
290 /* if at top level, try UNIVERSAL */
292 if (level == 0 || level == -1) {
295 if ((lastchance = gv_stashpvn("UNIVERSAL", 9, FALSE))) {
296 if ((gv = gv_fetchmeth(lastchance, name, len,
297 (level >= 0) ? level + 1 : level - 1)))
301 * Cache method in topgv if:
302 * 1. topgv has no synonyms (else inheritance crosses wires)
303 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
306 GvREFCNT(topgv) == 1 &&
308 (CvROOT(cv) || CvXSUB(cv)))
310 if ((cv = GvCV(topgv)))
312 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
313 GvCVGEN(topgv) = PL_sub_generation;
317 else if (topgv && GvREFCNT(topgv) == 1) {
318 /* cache the fact that the method is not defined */
319 GvCVGEN(topgv) = PL_sub_generation;
328 =for apidoc gv_fetchmeth_autoload
330 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
331 Returns a glob for the subroutine.
333 For an autoloaded subroutine without a GV, will create a GV even
334 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
335 of the result may be zero.
341 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
343 GV *gv = gv_fetchmeth(stash, name, len, level);
350 return Nullgv; /* UNIVERSAL::AUTOLOAD could cause trouble */
351 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
353 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
356 if (!(CvROOT(cv) || CvXSUB(cv)))
358 /* Have an autoload */
359 if (level < 0) /* Cannot do without a stub */
360 gv_fetchmeth(stash, name, len, 0);
361 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
370 =for apidoc gv_fetchmethod
372 See L<gv_fetchmethod_autoload>.
378 Perl_gv_fetchmethod(pTHX_ HV *stash, const char *name)
380 return gv_fetchmethod_autoload(stash, name, TRUE);
384 =for apidoc gv_fetchmethod_autoload
386 Returns the glob which contains the subroutine to call to invoke the method
387 on the C<stash>. In fact in the presence of autoloading this may be the
388 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
391 The third parameter of C<gv_fetchmethod_autoload> determines whether
392 AUTOLOAD lookup is performed if the given method is not present: non-zero
393 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
394 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
395 with a non-zero C<autoload> parameter.
397 These functions grant C<"SUPER"> token as a prefix of the method name. Note
398 that if you want to keep the returned glob for a long time, you need to
399 check for it being "AUTOLOAD", since at the later time the call may load a
400 different subroutine due to $AUTOLOAD changing its value. Use the glob
401 created via a side effect to do this.
403 These functions have the same side-effects and as C<gv_fetchmeth> with
404 C<level==0>. C<name> should be writable if contains C<':'> or C<'
405 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
406 C<call_sv> apply equally to these functions.
412 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
414 register const char *nend;
415 const char *nsplit = 0;
419 if (stash && SvTYPE(stash) < SVt_PVHV)
422 for (nend = name; *nend; nend++) {
425 else if (*nend == ':' && *(nend + 1) == ':')
429 const char *origname = name;
433 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
434 /* ->SUPER::method should really be looked up in original stash */
435 SV *tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
436 CopSTASHPV(PL_curcop)));
437 /* __PACKAGE__::SUPER stash should be autovivified */
438 stash = gv_stashpvn(SvPVX_const(tmpstr), SvCUR(tmpstr), TRUE);
439 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
440 origname, HvNAME_get(stash), name) );
443 /* don't autovifify if ->NoSuchStash::method */
444 stash = gv_stashpvn(origname, nsplit - origname, FALSE);
446 /* however, explicit calls to Pkg::SUPER::method may
447 happen, and may require autovivification to work */
448 if (!stash && (nsplit - origname) >= 7 &&
449 strnEQ(nsplit - 7, "::SUPER", 7) &&
450 gv_stashpvn(origname, nsplit - origname - 7, FALSE))
451 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
456 gv = gv_fetchmeth(stash, name, nend - name, 0);
458 if (strEQ(name,"import") || strEQ(name,"unimport"))
459 gv = (GV*)&PL_sv_yes;
461 gv = gv_autoload4(ostash, name, nend - name, TRUE);
465 if (!CvROOT(cv) && !CvXSUB(cv)) {
473 if (GvCV(stubgv) != cv) /* orphaned import */
476 autogv = gv_autoload4(GvSTASH(stubgv),
477 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
487 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
495 const char *packname = "";
497 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
500 if (SvTYPE(stash) < SVt_PVHV) {
501 packname = SvPV_nolen((SV*)stash);
505 packname = HvNAME_get(stash);
508 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
512 if (!(CvROOT(cv) || CvXSUB(cv)))
516 * Inheriting AUTOLOAD for non-methods works ... for now.
518 if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX) && !method &&
519 (GvCVGEN(gv) || GvSTASH(gv) != stash))
520 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
521 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
522 packname, (int)len, name);
525 /* rather than lookup/init $AUTOLOAD here
526 * only to have the XSUB do another lookup for $AUTOLOAD
527 * and split that value on the last '::',
528 * pass along the same data via some unused fields in the CV
531 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
537 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
538 * The subroutine's original name may not be "AUTOLOAD", so we don't
539 * use that, but for lack of anything better we will use the sub's
540 * original package to look up $AUTOLOAD.
542 varstash = GvSTASH(CvGV(cv));
543 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
547 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
550 sv_setpv(varsv, packname);
551 sv_catpvn(varsv, "::", 2);
552 sv_catpvn(varsv, name, len);
553 SvTAINTED_off(varsv);
557 /* The "gv" parameter should be the glob known to Perl code as *!
558 * The scalar must already have been magicalized.
561 S_require_errno(pTHX_ GV *gv)
564 HV* stash = gv_stashpvn("Errno",5,FALSE);
566 if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
570 save_scalar(gv); /* keep the value of $! */
571 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
572 newSVpvn("Errno",5), Nullsv);
575 stash = gv_stashpvn("Errno",5,FALSE);
576 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
577 Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available");
582 =for apidoc gv_stashpv
584 Returns a pointer to the stash for a specified package. C<name> should
585 be a valid UTF-8 string and must be null-terminated. If C<create> is set
586 then the package will be created if it does not already exist. If C<create>
587 is not set and the package does not exist then NULL is returned.
593 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
595 return gv_stashpvn(name, strlen(name), create);
599 =for apidoc gv_stashpvn
601 Returns a pointer to the stash for a specified package. C<name> should
602 be a valid UTF-8 string. The C<namelen> parameter indicates the length of
603 the C<name>, in bytes. If C<create> is set then the package will be
604 created if it does not already exist. If C<create> is not set and the
605 package does not exist then NULL is returned.
611 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
618 if (namelen + 3 < sizeof smallbuf)
621 New(606, tmpbuf, namelen + 3, char);
622 Copy(name,tmpbuf,namelen,char);
623 tmpbuf[namelen++] = ':';
624 tmpbuf[namelen++] = ':';
625 tmpbuf[namelen] = '\0';
626 tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV);
627 if (tmpbuf != smallbuf)
632 GvHV(tmpgv) = newHV();
634 if (!HvNAME_get(stash))
635 Perl_hv_name_set(aTHX_ stash, name, namelen, 0);
640 =for apidoc gv_stashsv
642 Returns a pointer to the stash for a specified package, which must be a
643 valid UTF-8 string. See C<gv_stashpv>.
649 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
652 const char *ptr = SvPV(sv,len);
653 return gv_stashpvn(ptr, len, create);
658 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
659 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
663 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
665 const char *nambeg = SvPV(name, len);
666 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
670 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
673 register const char *name = nambeg;
677 register const char *namend;
679 const I32 add = flags & ~SVf_UTF8;
682 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
685 for (namend = name; *namend; namend++) {
686 if ((*namend == ':' && namend[1] == ':')
687 || (*namend == '\'' && namend[1]))
691 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
699 if (len + 3 < sizeof (smallbuf))
702 New(601, tmpbuf, len+3, char);
703 Copy(name, tmpbuf, len, char);
707 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
708 gv = gvp ? *gvp : Nullgv;
709 if (gv && gv != (GV*)&PL_sv_undef) {
710 if (SvTYPE(gv) != SVt_PVGV)
711 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
715 if (tmpbuf != smallbuf)
717 if (!gv || gv == (GV*)&PL_sv_undef)
720 if (!(stash = GvHV(gv)))
721 stash = GvHV(gv) = newHV();
723 if (!HvNAME_get(stash))
724 Perl_hv_name_set(aTHX, stash, nambeg, namend - nambeg, 0);
732 return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE);
737 /* No stash in name, so see how we can default */
740 if (isIDFIRST_lazy(name)) {
743 /* name is always \0 terminated, and initial \0 wouldn't return
744 true from isIDFIRST_lazy, so we know that name[1] is defined */
751 if (strEQ(name, "INC") || strEQ(name, "ENV"))
755 if (strEQ(name, "SIG"))
759 if (strEQ(name, "STDIN") || strEQ(name, "STDOUT") ||
760 strEQ(name, "STDERR"))
764 if (strEQ(name, "ARGV") || strEQ(name, "ARGVOUT"))
771 else if (IN_PERL_COMPILETIME) {
773 if (add && (PL_hints & HINT_STRICT_VARS) &&
774 sv_type != SVt_PVCV &&
775 sv_type != SVt_PVGV &&
776 sv_type != SVt_PVFM &&
777 sv_type != SVt_PVIO &&
778 !(len == 1 && sv_type == SVt_PV &&
779 (*name == 'a' || *name == 'b')) )
781 gvp = (GV**)hv_fetch(stash,name,len,0);
783 *gvp == (GV*)&PL_sv_undef ||
784 SvTYPE(*gvp) != SVt_PVGV)
788 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
789 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
790 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
792 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
793 sv_type == SVt_PVAV ? '@' :
794 sv_type == SVt_PVHV ? '%' : '$',
797 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
803 stash = CopSTASH(PL_curcop);
809 /* By this point we should have a stash and a name */
813 register SV *err = Perl_mess(aTHX_
814 "Global symbol \"%s%s\" requires explicit package name",
815 (sv_type == SVt_PV ? "$"
816 : sv_type == SVt_PVAV ? "@"
817 : sv_type == SVt_PVHV ? "%"
819 if (USE_UTF8_IN_NAMES)
822 stash = GvHV(gv_fetchpv("<none>::", GV_ADDMULTI, SVt_PVHV));
828 if (!SvREFCNT(stash)) /* symbol table under destruction */
831 gvp = (GV**)hv_fetch(stash,name,len,add);
832 if (!gvp || *gvp == (GV*)&PL_sv_undef)
835 if (SvTYPE(gv) == SVt_PVGV) {
838 gv_init_sv(gv, sv_type);
839 if (*name=='!' && sv_type == SVt_PVHV && len==1)
843 } else if (add & GV_NOINIT) {
847 /* Adding a new symbol */
849 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
850 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
851 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
852 gv_init_sv(gv, sv_type);
854 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
855 : (PL_dowarn & G_WARN_ON ) ) )
858 /* set up magic where warranted */
862 /* Nothing else to do.
863 The compiler will probably turn the switch statement into a
864 branch table. Make sure we avoid even that small overhead for
865 the common case of lower case variable names. */
869 const char *name2 = name + 1;
872 if (strEQ(name2, "RGV")) {
873 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
877 if (strnEQ(name2, "XPORT", 5))
881 if (strEQ(name2, "SA")) {
884 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, Nullch, 0);
885 /* NOTE: No support for tied ISA */
886 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
887 && AvFILLp(av) == -1)
890 av_push(av, newSVpvn(pname = "NDBM_File",9));
891 gv_stashpvn(pname, 9, TRUE);
892 av_push(av, newSVpvn(pname = "DB_File",7));
893 gv_stashpvn(pname, 7, TRUE);
894 av_push(av, newSVpvn(pname = "GDBM_File",9));
895 gv_stashpvn(pname, 9, TRUE);
896 av_push(av, newSVpvn(pname = "SDBM_File",9));
897 gv_stashpvn(pname, 9, TRUE);
898 av_push(av, newSVpvn(pname = "ODBM_File",9));
899 gv_stashpvn(pname, 9, TRUE);
904 if (strEQ(name2, "VERLOAD")) {
907 hv_magic(hv, Nullgv, PERL_MAGIC_overload);
911 if (strEQ(name2, "IG")) {
915 Newz(73, PL_psig_ptr, SIG_SIZE, SV*);
916 Newz(73, PL_psig_name, SIG_SIZE, SV*);
917 Newz(73, PL_psig_pend, SIG_SIZE, int);
921 hv_magic(hv, Nullgv, PERL_MAGIC_sig);
922 for (i = 1; i < SIG_SIZE; i++) {
924 init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
926 sv_setsv(*init, &PL_sv_undef);
934 if (strEQ(name2, "ERSION"))
937 case '\003': /* $^CHILD_ERROR_NATIVE */
938 if (strEQ(name2, "HILD_ERROR_NATIVE"))
941 case '\005': /* $^ENCODING */
942 if (strEQ(name2, "NCODING"))
945 case '\017': /* $^OPEN */
946 if (strEQ(name2, "PEN"))
949 case '\024': /* ${^TAINT} */
950 if (strEQ(name2, "AINT"))
953 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
954 if (strEQ(name2, "NICODE"))
956 if (strEQ(name2, "TF8LOCALE"))
959 case '\027': /* $^WARNING_BITS */
960 if (strEQ(name2, "ARNING_BITS"))
973 /* ensures variable is only digits */
974 /* ${"1foo"} fails this test (and is thus writeable) */
975 /* added by japhy, but borrowed from is_gv_magical */
976 const char *end = name + len;
977 while (--end > name) {
978 if (!isDIGIT(*end)) return gv;
985 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
986 be case '\0' in this switch statement (ie a default case) */
992 sv_type == SVt_PVAV ||
993 sv_type == SVt_PVHV ||
994 sv_type == SVt_PVCV ||
995 sv_type == SVt_PVFM ||
998 PL_sawampersand = TRUE;
1002 sv_setpv(GvSV(gv),PL_chopset);
1006 #ifdef COMPLEX_STATUS
1007 (void)SvUPGRADE(GvSV(gv), SVt_PVLV);
1013 /* If %! has been used, automatically load Errno.pm.
1014 The require will itself set errno, so in order to
1015 preserve its value we have to set up the magic
1016 now (rather than going to magicalize)
1019 sv_magic(GvSV(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1021 if (sv_type == SVt_PVHV)
1028 sv_magic((SV*)av, Nullsv, PERL_MAGIC_regdata, Nullch, 0);
1033 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1034 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1035 "$* is no longer supported");
1038 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1039 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1040 "Use of $# is deprecated");
1043 sv_setiv(GvSV(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1049 sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, Nullch, 0);
1053 case '\023': /* $^S */
1064 SvREADONLY_on(GvSV(gv));
1079 case '\001': /* $^A */
1080 case '\003': /* $^C */
1081 case '\004': /* $^D */
1082 case '\005': /* $^E */
1083 case '\006': /* $^F */
1084 case '\010': /* $^H */
1085 case '\011': /* $^I, NOT \t in EBCDIC */
1086 case '\016': /* $^N */
1087 case '\017': /* $^O */
1088 case '\020': /* $^P */
1089 case '\024': /* $^T */
1090 case '\027': /* $^W */
1092 sv_magic(GvSV(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1095 case '\014': /* $^L */
1096 sv_setpv(GvSV(gv),"\f");
1097 PL_formfeed = GvSV(gv);
1100 sv_setpv(GvSV(gv),"\034");
1105 if (!sv_derived_from(PL_patchlevel, "version"))
1106 (void *)upg_version(PL_patchlevel);
1107 GvSV(gv) = vnumify(PL_patchlevel);
1108 SvREADONLY_on(GvSV(gv));
1112 case '\026': /* $^V */
1114 SV * const sv = GvSV(gv);
1115 GvSV(gv) = new_version(PL_patchlevel);
1116 SvREADONLY_on(GvSV(gv));
1126 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1129 const HV * const hv = GvSTASH(gv);
1134 sv_setpv(sv, prefix ? prefix : "");
1136 name = HvNAME_get(hv);
1140 if (keepmain || strNE(name, "main")) {
1142 sv_catpvn(sv,"::", 2);
1144 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1148 Perl_gv_fullname3(pTHX_ SV *sv, const GV *gv, const char *prefix)
1150 gv_fullname4(sv, gv, prefix, TRUE);
1154 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1156 const GV *egv = GvEGV(gv);
1159 gv_fullname4(sv, egv, prefix, keepmain);
1163 Perl_gv_efullname3(pTHX_ SV *sv, const GV *gv, const char *prefix)
1165 gv_efullname4(sv, gv, prefix, TRUE);
1168 /* compatibility with versions <= 5.003. */
1170 Perl_gv_fullname(pTHX_ SV *sv, const GV *gv)
1172 gv_fullname3(sv, gv, sv == (const SV*)gv ? "*" : "");
1175 /* compatibility with versions <= 5.003. */
1177 Perl_gv_efullname(pTHX_ SV *sv, const GV *gv)
1179 gv_efullname3(sv, gv, sv == (const SV*)gv ? "*" : "");
1186 IO * const io = (IO*)NEWSV(0,0);
1188 sv_upgrade((SV *)io,SVt_PVIO);
1191 /* Clear the stashcache because a new IO could overrule a
1193 hv_clear(PL_stashcache);
1194 iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV);
1195 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1196 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1197 iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV);
1198 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1203 Perl_gv_check(pTHX_ HV *stash)
1207 if (!HvARRAY(stash))
1209 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1211 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1214 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1215 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1217 if (hv != PL_defstash && hv != stash)
1218 gv_check(hv); /* nested package */
1220 else if (isALPHA(*HeKEY(entry))) {
1222 gv = (GV*)HeVAL(entry);
1223 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1226 /* performance hack: if filename is absolute and it's a standard
1227 * module, don't bother warning */
1229 && PERL_FILE_IS_ABSOLUTE(file)
1230 #ifdef MACOS_TRADITIONAL
1231 && (instr(file, ":lib:")
1233 && (instr(file, "/lib/")
1235 || instr(file, ".pm")))
1239 CopLINE_set(PL_curcop, GvLINE(gv));
1241 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1243 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1245 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1246 "Name \"%s::%s\" used only once: possible typo",
1247 HvNAME_get(stash), GvNAME(gv));
1254 Perl_newGVgen(pTHX_ const char *pack)
1256 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1260 /* hopefully this is only called on local symbol table entries */
1263 Perl_gp_ref(pTHX_ GP *gp)
1270 /* multi-named GPs cannot be used for method cache */
1271 SvREFCNT_dec(gp->gp_cv);
1276 /* Adding a new name to a subroutine invalidates method cache */
1277 PL_sub_generation++;
1284 Perl_gp_free(pTHX_ GV *gv)
1288 if (!gv || !(gp = GvGP(gv)))
1290 if (gp->gp_refcnt == 0) {
1291 if (ckWARN_d(WARN_INTERNAL))
1292 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1293 "Attempt to free unreferenced glob pointers"
1294 pTHX__FORMAT pTHX__VALUE);
1298 /* Deleting the name of a subroutine invalidates method cache */
1299 PL_sub_generation++;
1301 if (--gp->gp_refcnt > 0) {
1302 if (gp->gp_egv == gv)
1307 if (gp->gp_sv) SvREFCNT_dec(gp->gp_sv);
1308 if (gp->gp_av) SvREFCNT_dec(gp->gp_av);
1309 /* FIXME - another reference loop GV -> symtab -> GV ?
1310 Somehow gp->gp_hv can end up pointing at freed garbage. */
1311 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1312 /* FIXME strlen HvNAME */
1313 const char *hvname = HvNAME_get(gp->gp_hv);
1314 if (PL_stashcache && hvname)
1315 hv_delete(PL_stashcache, hvname, strlen(hvname), G_DISCARD);
1316 SvREFCNT_dec(gp->gp_hv);
1318 if (gp->gp_io) SvREFCNT_dec(gp->gp_io);
1319 if (gp->gp_cv) SvREFCNT_dec(gp->gp_cv);
1320 if (gp->gp_form) SvREFCNT_dec(gp->gp_form);
1327 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1329 AMT *amtp = (AMT*)mg->mg_ptr;
1332 if (amtp && AMT_AMAGIC(amtp)) {
1334 for (i = 1; i < NofAMmeth; i++) {
1335 CV *cv = amtp->table[i];
1337 SvREFCNT_dec((SV *) cv);
1338 amtp->table[i] = Nullcv;
1345 /* Updates and caches the CV's */
1348 Perl_Gv_AMupdate(pTHX_ HV *stash)
1352 MAGIC* mg=mg_find((SV*)stash, PERL_MAGIC_overload_table);
1353 AMT *amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
1356 if (mg && amtp->was_ok_am == PL_amagic_generation
1357 && amtp->was_ok_sub == PL_sub_generation)
1358 return (bool)AMT_OVERLOADED(amtp);
1359 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1361 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1364 amt.was_ok_am = PL_amagic_generation;
1365 amt.was_ok_sub = PL_sub_generation;
1366 amt.fallback = AMGfallNO;
1370 int filled = 0, have_ovl = 0;
1374 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1376 /* Try to find via inheritance. */
1377 gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1382 lim = DESTROY_amg; /* Skip overloading entries. */
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. */
1419 DEBUG_o( Perl_deb(aTHX_ "Resolving method `%"SVf256\
1420 "' for overloaded `%s' in package `%.256s'\n",
1421 GvSV(gv), cp, hvname) );
1422 if (!SvPOK(GvSV(gv))
1423 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(GvSV(gv)),
1426 /* Can be an import stub (created by `can'). */
1427 SV *gvsv = GvSV(gv);
1428 const char *name = 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 *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, assign=AMGf_assign & flags, notfound=0;
1513 int postpr = 0, force_cpy = 0, assignshift = assign ? 1 : 0;
1518 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1519 && (stash = SvSTASH(SvRV(left)))
1520 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1521 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1522 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1524 && ((cv = cvp[off=method+assignshift])
1525 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1531 cv = cvp[off=method])))) {
1532 lr = -1; /* Call method for left argument */
1534 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1537 /* look for substituted methods */
1538 /* In all the covered cases we should be called with assign==0. */
1542 if ((cv = cvp[off=add_ass_amg])
1543 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1544 right = &PL_sv_yes; lr = -1; assign = 1;
1549 if ((cv = cvp[off = subtr_ass_amg])
1550 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1551 right = &PL_sv_yes; lr = -1; assign = 1;
1555 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1558 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1561 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1564 (void)((cv = cvp[off=bool__amg])
1565 || (cv = cvp[off=numer_amg])
1566 || (cv = cvp[off=string_amg]));
1572 * SV* ref causes confusion with the interpreter variable of
1575 SV* tmpRef=SvRV(left);
1576 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1578 * Just to be extra cautious. Maybe in some
1579 * additional cases sv_setsv is safe, too.
1581 SV* newref = newSVsv(tmpRef);
1582 SvOBJECT_on(newref);
1583 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1589 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1590 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1591 SV* nullsv=sv_2mortal(newSViv(0));
1593 SV* lessp = amagic_call(left,nullsv,
1594 lt_amg,AMGf_noright);
1595 logic = SvTRUE(lessp);
1597 SV* lessp = amagic_call(left,nullsv,
1598 ncmp_amg,AMGf_noright);
1599 logic = (SvNV(lessp) < 0);
1602 if (off==subtr_amg) {
1613 if ((cv = cvp[off=subtr_amg])) {
1615 left = sv_2mortal(newSViv(0));
1620 case iter_amg: /* XXXX Eventually should do to_gv. */
1622 return NULL; /* Delegate operation to standard mechanisms. */
1630 return left; /* Delegate operation to standard mechanisms. */
1635 if (!cv) goto not_found;
1636 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1637 && (stash = SvSTASH(SvRV(right)))
1638 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1639 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1640 ? (amtp = (AMT*)mg->mg_ptr)->table
1642 && (cv = cvp[off=method])) { /* Method for right
1645 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1646 && (cvp=ocvp) && (lr = -1))
1647 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1648 && !(flags & AMGf_unary)) {
1649 /* We look for substitution for
1650 * comparison operations and
1652 if (method==concat_amg || method==concat_ass_amg
1653 || method==repeat_amg || method==repeat_ass_amg) {
1654 return NULL; /* Delegate operation to string conversion */
1664 postpr = 1; off=ncmp_amg; break;
1671 postpr = 1; off=scmp_amg; break;
1673 if (off != -1) cv = cvp[off];
1678 not_found: /* No method found, either report or croak */
1686 return left; /* Delegate operation to standard mechanisms. */
1689 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1690 notfound = 1; lr = -1;
1691 } else if (cvp && (cv=cvp[nomethod_amg])) {
1692 notfound = 1; lr = 1;
1695 if (off==-1) off=method;
1696 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1697 "Operation `%s': no method found,%sargument %s%s%s%s",
1698 AMG_id2name(method + assignshift),
1699 (flags & AMGf_unary ? " " : "\n\tleft "),
1701 "in overloaded package ":
1702 "has no overloaded magic",
1704 HvNAME_get(SvSTASH(SvRV(left))):
1707 ",\n\tright argument in overloaded package ":
1710 : ",\n\tright argument has no overloaded magic"),
1712 HvNAME_get(SvSTASH(SvRV(right))):
1714 if (amtp && amtp->fallback >= AMGfallYES) {
1715 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1717 Perl_croak(aTHX_ "%"SVf, msg);
1721 force_cpy = force_cpy || assign;
1726 DEBUG_o(Perl_deb(aTHX_
1727 "Overloaded operator `%s'%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1729 method+assignshift==off? "" :
1731 method+assignshift==off? "" :
1732 AMG_id2name(method+assignshift),
1733 method+assignshift==off? "" : "')",
1734 flags & AMGf_unary? "" :
1735 lr==1 ? " for right argument": " for left argument",
1736 flags & AMGf_unary? " for argument" : "",
1737 stash ? HvNAME_get(stash) : "null",
1738 fl? ",\n\tassignment variant used": "") );
1741 /* Since we use shallow copy during assignment, we need
1742 * to dublicate the contents, probably calling user-supplied
1743 * version of copy operator
1745 /* We need to copy in following cases:
1746 * a) Assignment form was called.
1747 * assignshift==1, assign==T, method + 1 == off
1748 * b) Increment or decrement, called directly.
1749 * assignshift==0, assign==0, method + 0 == off
1750 * c) Increment or decrement, translated to assignment add/subtr.
1751 * assignshift==0, assign==T,
1753 * d) Increment or decrement, translated to nomethod.
1754 * assignshift==0, assign==0,
1756 * e) Assignment form translated to nomethod.
1757 * assignshift==1, assign==T, method + 1 != off
1760 /* off is method, method+assignshift, or a result of opcode substitution.
1761 * In the latter case assignshift==0, so only notfound case is important.
1763 if (( (method + assignshift == off)
1764 && (assign || (method == inc_amg) || (method == dec_amg)))
1771 const bool oldcatch = CATCH_GET;
1774 Zero(&myop, 1, BINOP);
1775 myop.op_last = (OP *) &myop;
1776 myop.op_next = Nullop;
1777 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1779 PUSHSTACKi(PERLSI_OVERLOAD);
1782 PL_op = (OP *) &myop;
1783 if (PERLDB_SUB && PL_curstash != PL_debstash)
1784 PL_op->op_private |= OPpENTERSUB_DB;
1788 EXTEND(SP, notfound + 5);
1789 PUSHs(lr>0? right: left);
1790 PUSHs(lr>0? left: right);
1791 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1793 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1798 if ((PL_op = Perl_pp_entersub(aTHX)))
1806 CATCH_SET(oldcatch);
1813 ans=SvIV(res)<=0; break;
1816 ans=SvIV(res)<0; break;
1819 ans=SvIV(res)>=0; break;
1822 ans=SvIV(res)>0; break;
1825 ans=SvIV(res)==0; break;
1828 ans=SvIV(res)!=0; break;
1831 SvSetSV(left,res); return left;
1833 ans=!SvTRUE(res); break;
1838 } else if (method==copy_amg) {
1840 Perl_croak(aTHX_ "Copy method did not return a reference");
1842 return SvREFCNT_inc(SvRV(res));
1850 =for apidoc is_gv_magical_sv
1852 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
1858 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
1861 const char *temp = SvPV(name, len);
1862 return is_gv_magical(temp, len, flags);
1866 =for apidoc is_gv_magical
1868 Returns C<TRUE> if given the name of a magical GV.
1870 Currently only useful internally when determining if a GV should be
1871 created even in rvalue contexts.
1873 C<flags> is not used at present but available for future extension to
1874 allow selecting particular classes of magical variable.
1876 Currently assumes that C<name> is NUL terminated (as well as len being valid).
1877 This assumption is met by all callers within the perl core, which all pass
1878 pointers returned by SvPV.
1883 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
1887 const char *name1 = name + 1;
1890 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
1894 if (len == 8 && strEQ(name1, "VERLOAD"))
1898 if (len == 3 && name[1] == 'I' && name[2] == 'G')
1901 /* Using ${^...} variables is likely to be sufficiently rare that
1902 it seems sensible to avoid the space hit of also checking the
1904 case '\017': /* ${^OPEN} */
1905 if (strEQ(name1, "PEN"))
1908 case '\024': /* ${^TAINT} */
1909 if (strEQ(name1, "AINT"))
1912 case '\025': /* ${^UNICODE} */
1913 if (strEQ(name1, "NICODE"))
1915 if (strEQ(name1, "TF8LOCALE"))
1918 case '\027': /* ${^WARNING_BITS} */
1919 if (strEQ(name1, "ARNING_BITS"))
1932 const char *end = name + len;
1933 while (--end > name) {
1941 /* Because we're already assuming that name is NUL terminated
1942 below, we can treat an empty name as "\0" */
1969 case '\001': /* $^A */
1970 case '\003': /* $^C */
1971 case '\004': /* $^D */
1972 case '\005': /* $^E */
1973 case '\006': /* $^F */
1974 case '\010': /* $^H */
1975 case '\011': /* $^I, NOT \t in EBCDIC */
1976 case '\014': /* $^L */
1977 case '\016': /* $^N */
1978 case '\017': /* $^O */
1979 case '\020': /* $^P */
1980 case '\023': /* $^S */
1981 case '\024': /* $^T */
1982 case '\026': /* $^V */
1983 case '\027': /* $^W */
2004 * c-indentation-style: bsd
2006 * indent-tabs-mode: t
2009 * ex: set ts=8 sts=4 sw=4 noet: