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 STRLEN packlen = HvNAMELEN_get(stash);
251 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
255 basestash = gv_stashpvn(hvname, packlen, TRUE);
256 gvp = (GV**)hv_fetch(basestash, "ISA", 3, FALSE);
257 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
258 gvp = (GV**)hv_fetch(stash, "ISA", 3, TRUE);
259 if (!gvp || !(gv = *gvp))
260 Perl_croak(aTHX_ "Cannot create %s::ISA", hvname);
261 if (SvTYPE(gv) != SVt_PVGV)
262 gv_init(gv, stash, "ISA", 3, TRUE);
263 SvREFCNT_dec(GvAV(gv));
264 GvAV(gv) = (AV*)SvREFCNT_inc(av);
270 SV** svp = AvARRAY(av);
271 /* NOTE: No support for tied ISA */
272 I32 items = AvFILLp(av) + 1;
275 HV* basestash = gv_stashsv(sv, FALSE);
277 if (ckWARN(WARN_MISC))
278 Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
282 gv = gv_fetchmeth(basestash, name, len,
283 (level >= 0) ? level + 1 : level - 1);
289 /* if at top level, try UNIVERSAL */
291 if (level == 0 || level == -1) {
294 if ((lastchance = gv_stashpvn("UNIVERSAL", 9, FALSE))) {
295 if ((gv = gv_fetchmeth(lastchance, name, len,
296 (level >= 0) ? level + 1 : level - 1)))
300 * Cache method in topgv if:
301 * 1. topgv has no synonyms (else inheritance crosses wires)
302 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
305 GvREFCNT(topgv) == 1 &&
307 (CvROOT(cv) || CvXSUB(cv)))
309 if ((cv = GvCV(topgv)))
311 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
312 GvCVGEN(topgv) = PL_sub_generation;
316 else if (topgv && GvREFCNT(topgv) == 1) {
317 /* cache the fact that the method is not defined */
318 GvCVGEN(topgv) = PL_sub_generation;
327 =for apidoc gv_fetchmeth_autoload
329 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
330 Returns a glob for the subroutine.
332 For an autoloaded subroutine without a GV, will create a GV even
333 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
334 of the result may be zero.
340 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
342 GV *gv = gv_fetchmeth(stash, name, len, level);
349 return Nullgv; /* UNIVERSAL::AUTOLOAD could cause trouble */
350 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
352 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
355 if (!(CvROOT(cv) || CvXSUB(cv)))
357 /* Have an autoload */
358 if (level < 0) /* Cannot do without a stub */
359 gv_fetchmeth(stash, name, len, 0);
360 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
369 =for apidoc gv_fetchmethod
371 See L<gv_fetchmethod_autoload>.
377 Perl_gv_fetchmethod(pTHX_ HV *stash, const char *name)
379 return gv_fetchmethod_autoload(stash, name, TRUE);
383 =for apidoc gv_fetchmethod_autoload
385 Returns the glob which contains the subroutine to call to invoke the method
386 on the C<stash>. In fact in the presence of autoloading this may be the
387 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
390 The third parameter of C<gv_fetchmethod_autoload> determines whether
391 AUTOLOAD lookup is performed if the given method is not present: non-zero
392 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
393 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
394 with a non-zero C<autoload> parameter.
396 These functions grant C<"SUPER"> token as a prefix of the method name. Note
397 that if you want to keep the returned glob for a long time, you need to
398 check for it being "AUTOLOAD", since at the later time the call may load a
399 different subroutine due to $AUTOLOAD changing its value. Use the glob
400 created via a side effect to do this.
402 These functions have the same side-effects and as C<gv_fetchmeth> with
403 C<level==0>. C<name> should be writable if contains C<':'> or C<'
404 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
405 C<call_sv> apply equally to these functions.
411 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
413 register const char *nend;
414 const char *nsplit = 0;
418 if (stash && SvTYPE(stash) < SVt_PVHV)
421 for (nend = name; *nend; nend++) {
424 else if (*nend == ':' && *(nend + 1) == ':')
428 const char *origname = name;
432 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
433 /* ->SUPER::method should really be looked up in original stash */
434 SV *tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
435 CopSTASHPV(PL_curcop)));
436 /* __PACKAGE__::SUPER stash should be autovivified */
437 stash = gv_stashpvn(SvPVX_const(tmpstr), SvCUR(tmpstr), TRUE);
438 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
439 origname, HvNAME_get(stash), name) );
442 /* don't autovifify if ->NoSuchStash::method */
443 stash = gv_stashpvn(origname, nsplit - origname, FALSE);
445 /* however, explicit calls to Pkg::SUPER::method may
446 happen, and may require autovivification to work */
447 if (!stash && (nsplit - origname) >= 7 &&
448 strnEQ(nsplit - 7, "::SUPER", 7) &&
449 gv_stashpvn(origname, nsplit - origname - 7, FALSE))
450 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
455 gv = gv_fetchmeth(stash, name, nend - name, 0);
457 if (strEQ(name,"import") || strEQ(name,"unimport"))
458 gv = (GV*)&PL_sv_yes;
460 gv = gv_autoload4(ostash, name, nend - name, TRUE);
464 if (!CvROOT(cv) && !CvXSUB(cv)) {
472 if (GvCV(stubgv) != cv) /* orphaned import */
475 autogv = gv_autoload4(GvSTASH(stubgv),
476 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
486 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
494 const char *packname = "";
497 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
500 if (SvTYPE(stash) < SVt_PVHV) {
501 packname = SvPV_const((SV*)stash, packname_len);
505 packname = HvNAME_get(stash);
506 packname_len = HvNAMELEN_get(stash);
509 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
513 if (!(CvROOT(cv) || CvXSUB(cv)))
517 * Inheriting AUTOLOAD for non-methods works ... for now.
519 if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX) && !method &&
520 (GvCVGEN(gv) || GvSTASH(gv) != stash))
521 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
522 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
523 packname, (int)len, name);
526 /* rather than lookup/init $AUTOLOAD here
527 * only to have the XSUB do another lookup for $AUTOLOAD
528 * and split that value on the last '::',
529 * pass along the same data via some unused fields in the CV
532 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
538 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
539 * The subroutine's original name may not be "AUTOLOAD", so we don't
540 * use that, but for lack of anything better we will use the sub's
541 * original package to look up $AUTOLOAD.
543 varstash = GvSTASH(CvGV(cv));
544 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
548 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
551 sv_setpvn(varsv, packname, packname_len);
552 sv_catpvn(varsv, "::", 2);
553 sv_catpvn(varsv, name, len);
554 SvTAINTED_off(varsv);
558 /* The "gv" parameter should be the glob known to Perl code as *!
559 * The scalar must already have been magicalized.
562 S_require_errno(pTHX_ GV *gv)
565 HV* stash = gv_stashpvn("Errno",5,FALSE);
567 if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
571 save_scalar(gv); /* keep the value of $! */
572 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
573 newSVpvn("Errno",5), Nullsv);
576 stash = gv_stashpvn("Errno",5,FALSE);
577 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
578 Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available");
583 =for apidoc gv_stashpv
585 Returns a pointer to the stash for a specified package. C<name> should
586 be a valid UTF-8 string and must be null-terminated. If C<create> is set
587 then the package will be created if it does not already exist. If C<create>
588 is not set and the package does not exist then NULL is returned.
594 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
596 return gv_stashpvn(name, strlen(name), create);
600 =for apidoc gv_stashpvn
602 Returns a pointer to the stash for a specified package. C<name> should
603 be a valid UTF-8 string. The C<namelen> parameter indicates the length of
604 the C<name>, in bytes. If C<create> is set then the package will be
605 created if it does not already exist. If C<create> is not set and the
606 package does not exist then NULL is returned.
612 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
619 if (namelen + 3 < sizeof smallbuf)
622 New(606, tmpbuf, namelen + 3, char);
623 Copy(name,tmpbuf,namelen,char);
624 tmpbuf[namelen++] = ':';
625 tmpbuf[namelen++] = ':';
626 tmpbuf[namelen] = '\0';
627 tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV);
628 if (tmpbuf != smallbuf)
633 GvHV(tmpgv) = newHV();
635 if (!HvNAME_get(stash))
636 Perl_hv_name_set(aTHX_ stash, name, namelen, 0);
641 =for apidoc gv_stashsv
643 Returns a pointer to the stash for a specified package, which must be a
644 valid UTF-8 string. See C<gv_stashpv>.
650 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
653 const char *ptr = SvPV_const(sv,len);
654 return gv_stashpvn(ptr, len, create);
659 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
660 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
664 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
666 const char *nambeg = SvPV_const(name, len);
667 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
671 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
674 register const char *name = nambeg;
678 register const char *namend;
680 const I32 add = flags & ~SVf_UTF8;
683 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
686 for (namend = name; *namend; namend++) {
687 if ((*namend == ':' && namend[1] == ':')
688 || (*namend == '\'' && namend[1]))
692 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
700 if (len + 3 < sizeof (smallbuf))
703 New(601, tmpbuf, len+3, char);
704 Copy(name, tmpbuf, len, char);
708 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
709 gv = gvp ? *gvp : Nullgv;
710 if (gv && gv != (GV*)&PL_sv_undef) {
711 if (SvTYPE(gv) != SVt_PVGV)
712 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
716 if (tmpbuf != smallbuf)
718 if (!gv || gv == (GV*)&PL_sv_undef)
721 if (!(stash = GvHV(gv)))
722 stash = GvHV(gv) = newHV();
724 if (!HvNAME_get(stash))
725 Perl_hv_name_set(aTHX_ stash, nambeg, namend - nambeg, 0);
733 return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE);
738 /* No stash in name, so see how we can default */
741 if (isIDFIRST_lazy(name)) {
744 /* name is always \0 terminated, and initial \0 wouldn't return
745 true from isIDFIRST_lazy, so we know that name[1] is defined */
752 if (strEQ(name, "INC") || strEQ(name, "ENV"))
756 if (strEQ(name, "SIG"))
760 if (strEQ(name, "STDIN") || strEQ(name, "STDOUT") ||
761 strEQ(name, "STDERR"))
765 if (strEQ(name, "ARGV") || strEQ(name, "ARGVOUT"))
772 else if (IN_PERL_COMPILETIME) {
774 if (add && (PL_hints & HINT_STRICT_VARS) &&
775 sv_type != SVt_PVCV &&
776 sv_type != SVt_PVGV &&
777 sv_type != SVt_PVFM &&
778 sv_type != SVt_PVIO &&
779 !(len == 1 && sv_type == SVt_PV &&
780 (*name == 'a' || *name == 'b')) )
782 gvp = (GV**)hv_fetch(stash,name,len,0);
784 *gvp == (GV*)&PL_sv_undef ||
785 SvTYPE(*gvp) != SVt_PVGV)
789 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
790 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
791 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
793 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
794 sv_type == SVt_PVAV ? '@' :
795 sv_type == SVt_PVHV ? '%' : '$',
798 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
804 stash = CopSTASH(PL_curcop);
810 /* By this point we should have a stash and a name */
814 register SV *err = Perl_mess(aTHX_
815 "Global symbol \"%s%s\" requires explicit package name",
816 (sv_type == SVt_PV ? "$"
817 : sv_type == SVt_PVAV ? "@"
818 : sv_type == SVt_PVHV ? "%"
820 if (USE_UTF8_IN_NAMES)
823 stash = GvHV(gv_fetchpv("<none>::", GV_ADDMULTI, SVt_PVHV));
829 if (!SvREFCNT(stash)) /* symbol table under destruction */
832 gvp = (GV**)hv_fetch(stash,name,len,add);
833 if (!gvp || *gvp == (GV*)&PL_sv_undef)
836 if (SvTYPE(gv) == SVt_PVGV) {
839 gv_init_sv(gv, sv_type);
840 if (*name=='!' && sv_type == SVt_PVHV && len==1)
844 } else if (add & GV_NOINIT) {
848 /* Adding a new symbol */
850 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
851 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
852 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
853 gv_init_sv(gv, sv_type);
855 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
856 : (PL_dowarn & G_WARN_ON ) ) )
859 /* set up magic where warranted */
863 /* Nothing else to do.
864 The compiler will probably turn the switch statement into a
865 branch table. Make sure we avoid even that small overhead for
866 the common case of lower case variable names. */
870 const char * const name2 = name + 1;
873 if (strEQ(name2, "RGV")) {
874 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
878 if (strnEQ(name2, "XPORT", 5))
882 if (strEQ(name2, "SA")) {
885 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, Nullch, 0);
886 /* NOTE: No support for tied ISA */
887 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
888 && AvFILLp(av) == -1)
891 av_push(av, newSVpvn(pname = "NDBM_File",9));
892 gv_stashpvn(pname, 9, TRUE);
893 av_push(av, newSVpvn(pname = "DB_File",7));
894 gv_stashpvn(pname, 7, TRUE);
895 av_push(av, newSVpvn(pname = "GDBM_File",9));
896 gv_stashpvn(pname, 9, TRUE);
897 av_push(av, newSVpvn(pname = "SDBM_File",9));
898 gv_stashpvn(pname, 9, TRUE);
899 av_push(av, newSVpvn(pname = "ODBM_File",9));
900 gv_stashpvn(pname, 9, TRUE);
905 if (strEQ(name2, "VERLOAD")) {
908 hv_magic(hv, Nullgv, PERL_MAGIC_overload);
912 if (strEQ(name2, "IG")) {
916 Newz(73, PL_psig_ptr, SIG_SIZE, SV*);
917 Newz(73, PL_psig_name, SIG_SIZE, SV*);
918 Newz(73, PL_psig_pend, SIG_SIZE, int);
922 hv_magic(hv, Nullgv, PERL_MAGIC_sig);
923 for (i = 1; i < SIG_SIZE; i++) {
925 init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
927 sv_setsv(*init, &PL_sv_undef);
935 if (strEQ(name2, "ERSION"))
938 case '\003': /* $^CHILD_ERROR_NATIVE */
939 if (strEQ(name2, "HILD_ERROR_NATIVE"))
942 case '\005': /* $^ENCODING */
943 if (strEQ(name2, "NCODING"))
946 case '\017': /* $^OPEN */
947 if (strEQ(name2, "PEN"))
950 case '\024': /* ${^TAINT} */
951 if (strEQ(name2, "AINT"))
954 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
955 if (strEQ(name2, "NICODE"))
957 if (strEQ(name2, "TF8LOCALE"))
960 case '\027': /* $^WARNING_BITS */
961 if (strEQ(name2, "ARNING_BITS"))
974 /* ensures variable is only digits */
975 /* ${"1foo"} fails this test (and is thus writeable) */
976 /* added by japhy, but borrowed from is_gv_magical */
977 const char *end = name + len;
978 while (--end > name) {
979 if (!isDIGIT(*end)) return gv;
986 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
987 be case '\0' in this switch statement (ie a default case) */
993 sv_type == SVt_PVAV ||
994 sv_type == SVt_PVHV ||
995 sv_type == SVt_PVCV ||
996 sv_type == SVt_PVFM ||
999 PL_sawampersand = TRUE;
1003 sv_setpv(GvSV(gv),PL_chopset);
1007 #ifdef COMPLEX_STATUS
1008 SvUPGRADE(GvSV(gv), SVt_PVLV);
1014 /* If %! has been used, automatically load Errno.pm.
1015 The require will itself set errno, so in order to
1016 preserve its value we have to set up the magic
1017 now (rather than going to magicalize)
1020 sv_magic(GvSV(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1022 if (sv_type == SVt_PVHV)
1029 sv_magic((SV*)av, Nullsv, PERL_MAGIC_regdata, Nullch, 0);
1035 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1036 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1037 "$%c is no longer supported", *name);
1040 sv_setiv(GvSV(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1046 sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, Nullch, 0);
1050 case '\023': /* $^S */
1061 SvREADONLY_on(GvSV(gv));
1076 case '\001': /* $^A */
1077 case '\003': /* $^C */
1078 case '\004': /* $^D */
1079 case '\005': /* $^E */
1080 case '\006': /* $^F */
1081 case '\010': /* $^H */
1082 case '\011': /* $^I, NOT \t in EBCDIC */
1083 case '\016': /* $^N */
1084 case '\017': /* $^O */
1085 case '\020': /* $^P */
1086 case '\024': /* $^T */
1087 case '\027': /* $^W */
1089 sv_magic(GvSV(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1092 case '\014': /* $^L */
1093 sv_setpvn(GvSV(gv),"\f",1);
1094 PL_formfeed = GvSV(gv);
1097 sv_setpvn(GvSV(gv),"\034",1);
1102 if (!sv_derived_from(PL_patchlevel, "version"))
1103 (void *)upg_version(PL_patchlevel);
1104 GvSV(gv) = vnumify(PL_patchlevel);
1105 SvREADONLY_on(GvSV(gv));
1109 case '\026': /* $^V */
1111 SV * const sv = GvSV(gv);
1112 GvSV(gv) = new_version(PL_patchlevel);
1113 SvREADONLY_on(GvSV(gv));
1123 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1127 const HV * const hv = GvSTASH(gv);
1132 sv_setpv(sv, prefix ? prefix : "");
1134 name = HvNAME_get(hv);
1136 namelen = HvNAMELEN_get(hv);
1142 if (keepmain || strNE(name, "main")) {
1143 sv_catpvn(sv,name,namelen);
1144 sv_catpvn(sv,"::", 2);
1146 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1150 Perl_gv_fullname3(pTHX_ SV *sv, const GV *gv, const char *prefix)
1152 gv_fullname4(sv, gv, prefix, TRUE);
1156 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1158 const GV *egv = GvEGV(gv);
1161 gv_fullname4(sv, egv, prefix, keepmain);
1165 Perl_gv_efullname3(pTHX_ SV *sv, const GV *gv, const char *prefix)
1167 gv_efullname4(sv, gv, prefix, TRUE);
1170 /* compatibility with versions <= 5.003. */
1172 Perl_gv_fullname(pTHX_ SV *sv, const GV *gv)
1174 gv_fullname3(sv, gv, sv == (const SV*)gv ? "*" : "");
1177 /* compatibility with versions <= 5.003. */
1179 Perl_gv_efullname(pTHX_ SV *sv, const GV *gv)
1181 gv_efullname3(sv, gv, sv == (const SV*)gv ? "*" : "");
1188 IO * const io = (IO*)NEWSV(0,0);
1190 sv_upgrade((SV *)io,SVt_PVIO);
1193 /* Clear the stashcache because a new IO could overrule a package name */
1194 hv_clear(PL_stashcache);
1195 iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV);
1196 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1197 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1198 iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV);
1199 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1204 Perl_gv_check(pTHX_ HV *stash)
1208 if (!HvARRAY(stash))
1210 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1212 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1215 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1216 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1218 if (hv != PL_defstash && hv != stash)
1219 gv_check(hv); /* nested package */
1221 else if (isALPHA(*HeKEY(entry))) {
1223 gv = (GV*)HeVAL(entry);
1224 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1227 /* performance hack: if filename is absolute and it's a standard
1228 * module, don't bother warning */
1230 && PERL_FILE_IS_ABSOLUTE(file)
1231 #ifdef MACOS_TRADITIONAL
1232 && (instr(file, ":lib:")
1234 && (instr(file, "/lib/")
1236 || instr(file, ".pm")))
1240 CopLINE_set(PL_curcop, GvLINE(gv));
1242 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1244 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1246 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1247 "Name \"%s::%s\" used only once: possible typo",
1248 HvNAME_get(stash), GvNAME(gv));
1255 Perl_newGVgen(pTHX_ const char *pack)
1257 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1261 /* hopefully this is only called on local symbol table entries */
1264 Perl_gp_ref(pTHX_ GP *gp)
1271 /* multi-named GPs cannot be used for method cache */
1272 SvREFCNT_dec(gp->gp_cv);
1277 /* Adding a new name to a subroutine invalidates method cache */
1278 PL_sub_generation++;
1285 Perl_gp_free(pTHX_ GV *gv)
1289 if (!gv || !(gp = GvGP(gv)))
1291 if (gp->gp_refcnt == 0) {
1292 if (ckWARN_d(WARN_INTERNAL))
1293 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1294 "Attempt to free unreferenced glob pointers"
1295 pTHX__FORMAT pTHX__VALUE);
1299 /* Deleting the name of a subroutine invalidates method cache */
1300 PL_sub_generation++;
1302 if (--gp->gp_refcnt > 0) {
1303 if (gp->gp_egv == gv)
1308 if (gp->gp_sv) SvREFCNT_dec(gp->gp_sv);
1309 if (gp->gp_av) SvREFCNT_dec(gp->gp_av);
1310 /* FIXME - another reference loop GV -> symtab -> GV ?
1311 Somehow gp->gp_hv can end up pointing at freed garbage. */
1312 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1313 const char *hvname = HvNAME_get(gp->gp_hv);
1314 if (PL_stashcache && hvname)
1315 hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv),
1317 SvREFCNT_dec(gp->gp_hv);
1319 if (gp->gp_io) SvREFCNT_dec(gp->gp_io);
1320 if (gp->gp_cv) SvREFCNT_dec(gp->gp_cv);
1321 if (gp->gp_form) SvREFCNT_dec(gp->gp_form);
1328 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1330 AMT *amtp = (AMT*)mg->mg_ptr;
1333 if (amtp && AMT_AMAGIC(amtp)) {
1335 for (i = 1; i < NofAMmeth; i++) {
1336 CV *cv = amtp->table[i];
1338 SvREFCNT_dec((SV *) cv);
1339 amtp->table[i] = Nullcv;
1346 /* Updates and caches the CV's */
1349 Perl_Gv_AMupdate(pTHX_ HV *stash)
1353 MAGIC* mg=mg_find((SV*)stash, PERL_MAGIC_overload_table);
1354 AMT *amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
1357 if (mg && amtp->was_ok_am == PL_amagic_generation
1358 && amtp->was_ok_sub == PL_sub_generation)
1359 return (bool)AMT_OVERLOADED(amtp);
1360 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1362 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1365 amt.was_ok_am = PL_amagic_generation;
1366 amt.was_ok_sub = PL_sub_generation;
1367 amt.fallback = AMGfallNO;
1371 int filled = 0, have_ovl = 0;
1375 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1377 /* Try to find via inheritance. */
1378 gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1383 lim = DESTROY_amg; /* Skip overloading entries. */
1384 else if (SvTRUE(sv))
1385 amt.fallback=AMGfallYES;
1387 amt.fallback=AMGfallNEVER;
1389 for (i = 1; i < lim; i++)
1390 amt.table[i] = Nullcv;
1391 for (; i < NofAMmeth; i++) {
1392 const char *cooky = PL_AMG_names[i];
1393 /* Human-readable form, for debugging: */
1394 const char *cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1395 const STRLEN l = strlen(cooky);
1397 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1398 cp, HvNAME_get(stash)) );
1399 /* don't fill the cache while looking up!
1400 Creation of inheritance stubs in intermediate packages may
1401 conflict with the logic of runtime method substitution.
1402 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1403 then we could have created stubs for "(+0" in A and C too.
1404 But if B overloads "bool", we may want to use it for
1405 numifying instead of C's "+0". */
1406 if (i >= DESTROY_amg)
1407 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1408 else /* Autoload taken care of below */
1409 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1411 if (gv && (cv = GvCV(gv))) {
1413 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1414 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1415 /* This is a hack to support autoloading..., while
1416 knowing *which* methods were declared as overloaded. */
1417 /* GvSV contains the name of the method. */
1420 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1421 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1422 GvSV(gv), cp, hvname) );
1423 if (!SvPOK(GvSV(gv))
1424 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(GvSV(gv)),
1427 /* Can be an import stub (created by "can"). */
1428 SV *gvsv = GvSV(gv);
1429 const char * const name = SvPOK(gvsv) ? SvPVX_const(gvsv) : "???";
1430 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1431 "in package \"%.256s\"",
1432 (GvCVGEN(gv) ? "Stub found while resolving"
1436 cv = GvCV(gv = ngv);
1438 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1439 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1440 GvNAME(CvGV(cv))) );
1442 if (i < DESTROY_amg)
1444 } else if (gv) { /* Autoloaded... */
1448 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1451 AMT_AMAGIC_on(&amt);
1453 AMT_OVERLOADED_on(&amt);
1454 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1455 (char*)&amt, sizeof(AMT));
1459 /* Here we have no table: */
1461 AMT_AMAGIC_off(&amt);
1462 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1463 (char*)&amt, sizeof(AMTS));
1469 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1474 if (!stash || !HvNAME_get(stash))
1476 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1480 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1482 amtp = (AMT*)mg->mg_ptr;
1483 if ( amtp->was_ok_am != PL_amagic_generation
1484 || amtp->was_ok_sub != PL_sub_generation )
1486 if (AMT_AMAGIC(amtp)) {
1487 CV * const ret = amtp->table[id];
1488 if (ret && isGV(ret)) { /* Autoloading stab */
1489 /* Passing it through may have resulted in a warning
1490 "Inherited AUTOLOAD for a non-method deprecated", since
1491 our caller is going through a function call, not a method call.
1492 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1493 GV *gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1506 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1511 CV **cvp=NULL, **ocvp=NULL;
1512 AMT *amtp=NULL, *oamtp=NULL;
1513 int off = 0, off1, lr = 0, notfound = 0;
1514 int postpr = 0, force_cpy = 0;
1515 int assign = AMGf_assign & flags;
1516 const int assignshift = assign ? 1 : 0;
1521 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1522 && (stash = SvSTASH(SvRV(left)))
1523 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1524 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1525 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1527 && ((cv = cvp[off=method+assignshift])
1528 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1534 cv = cvp[off=method])))) {
1535 lr = -1; /* Call method for left argument */
1537 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1540 /* look for substituted methods */
1541 /* In all the covered cases we should be called with assign==0. */
1545 if ((cv = cvp[off=add_ass_amg])
1546 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1547 right = &PL_sv_yes; lr = -1; assign = 1;
1552 if ((cv = cvp[off = subtr_ass_amg])
1553 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1554 right = &PL_sv_yes; lr = -1; assign = 1;
1558 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1561 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1564 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1567 (void)((cv = cvp[off=bool__amg])
1568 || (cv = cvp[off=numer_amg])
1569 || (cv = cvp[off=string_amg]));
1575 * SV* ref causes confusion with the interpreter variable of
1578 SV* tmpRef=SvRV(left);
1579 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1581 * Just to be extra cautious. Maybe in some
1582 * additional cases sv_setsv is safe, too.
1584 SV* newref = newSVsv(tmpRef);
1585 SvOBJECT_on(newref);
1586 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1592 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1593 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1594 SV* nullsv=sv_2mortal(newSViv(0));
1596 SV* lessp = amagic_call(left,nullsv,
1597 lt_amg,AMGf_noright);
1598 logic = SvTRUE(lessp);
1600 SV* lessp = amagic_call(left,nullsv,
1601 ncmp_amg,AMGf_noright);
1602 logic = (SvNV(lessp) < 0);
1605 if (off==subtr_amg) {
1616 if ((cv = cvp[off=subtr_amg])) {
1618 left = sv_2mortal(newSViv(0));
1623 case iter_amg: /* XXXX Eventually should do to_gv. */
1625 return NULL; /* Delegate operation to standard mechanisms. */
1633 return left; /* Delegate operation to standard mechanisms. */
1638 if (!cv) goto not_found;
1639 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1640 && (stash = SvSTASH(SvRV(right)))
1641 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1642 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1643 ? (amtp = (AMT*)mg->mg_ptr)->table
1645 && (cv = cvp[off=method])) { /* Method for right
1648 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1649 && (cvp=ocvp) && (lr = -1))
1650 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1651 && !(flags & AMGf_unary)) {
1652 /* We look for substitution for
1653 * comparison operations and
1655 if (method==concat_amg || method==concat_ass_amg
1656 || method==repeat_amg || method==repeat_ass_amg) {
1657 return NULL; /* Delegate operation to string conversion */
1667 postpr = 1; off=ncmp_amg; break;
1674 postpr = 1; off=scmp_amg; break;
1676 if (off != -1) cv = cvp[off];
1681 not_found: /* No method found, either report or croak */
1689 return left; /* Delegate operation to standard mechanisms. */
1692 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1693 notfound = 1; lr = -1;
1694 } else if (cvp && (cv=cvp[nomethod_amg])) {
1695 notfound = 1; lr = 1;
1698 if (off==-1) off=method;
1699 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1700 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1701 AMG_id2name(method + assignshift),
1702 (flags & AMGf_unary ? " " : "\n\tleft "),
1704 "in overloaded package ":
1705 "has no overloaded magic",
1707 HvNAME_get(SvSTASH(SvRV(left))):
1710 ",\n\tright argument in overloaded package ":
1713 : ",\n\tright argument has no overloaded magic"),
1715 HvNAME_get(SvSTASH(SvRV(right))):
1717 if (amtp && amtp->fallback >= AMGfallYES) {
1718 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1720 Perl_croak(aTHX_ "%"SVf, msg);
1724 force_cpy = force_cpy || assign;
1729 DEBUG_o(Perl_deb(aTHX_
1730 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1732 method+assignshift==off? "" :
1734 method+assignshift==off? "" :
1735 AMG_id2name(method+assignshift),
1736 method+assignshift==off? "" : "\")",
1737 flags & AMGf_unary? "" :
1738 lr==1 ? " for right argument": " for left argument",
1739 flags & AMGf_unary? " for argument" : "",
1740 stash ? HvNAME_get(stash) : "null",
1741 fl? ",\n\tassignment variant used": "") );
1744 /* Since we use shallow copy during assignment, we need
1745 * to dublicate the contents, probably calling user-supplied
1746 * version of copy operator
1748 /* We need to copy in following cases:
1749 * a) Assignment form was called.
1750 * assignshift==1, assign==T, method + 1 == off
1751 * b) Increment or decrement, called directly.
1752 * assignshift==0, assign==0, method + 0 == off
1753 * c) Increment or decrement, translated to assignment add/subtr.
1754 * assignshift==0, assign==T,
1756 * d) Increment or decrement, translated to nomethod.
1757 * assignshift==0, assign==0,
1759 * e) Assignment form translated to nomethod.
1760 * assignshift==1, assign==T, method + 1 != off
1763 /* off is method, method+assignshift, or a result of opcode substitution.
1764 * In the latter case assignshift==0, so only notfound case is important.
1766 if (( (method + assignshift == off)
1767 && (assign || (method == inc_amg) || (method == dec_amg)))
1774 const bool oldcatch = CATCH_GET;
1777 Zero(&myop, 1, BINOP);
1778 myop.op_last = (OP *) &myop;
1779 myop.op_next = Nullop;
1780 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1782 PUSHSTACKi(PERLSI_OVERLOAD);
1785 PL_op = (OP *) &myop;
1786 if (PERLDB_SUB && PL_curstash != PL_debstash)
1787 PL_op->op_private |= OPpENTERSUB_DB;
1791 EXTEND(SP, notfound + 5);
1792 PUSHs(lr>0? right: left);
1793 PUSHs(lr>0? left: right);
1794 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1796 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1801 if ((PL_op = Perl_pp_entersub(aTHX)))
1809 CATCH_SET(oldcatch);
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 ans=SvIV(res)!=0; break;
1834 SvSetSV(left,res); return left;
1836 ans=!SvTRUE(res); break;
1841 } else if (method==copy_amg) {
1843 Perl_croak(aTHX_ "Copy method did not return a reference");
1845 return SvREFCNT_inc(SvRV(res));
1853 =for apidoc is_gv_magical_sv
1855 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
1861 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
1864 const char *temp = SvPV_const(name, len);
1865 return is_gv_magical(temp, len, flags);
1869 =for apidoc is_gv_magical
1871 Returns C<TRUE> if given the name of a magical GV.
1873 Currently only useful internally when determining if a GV should be
1874 created even in rvalue contexts.
1876 C<flags> is not used at present but available for future extension to
1877 allow selecting particular classes of magical variable.
1879 Currently assumes that C<name> is NUL terminated (as well as len being valid).
1880 This assumption is met by all callers within the perl core, which all pass
1881 pointers returned by SvPV.
1886 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 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: