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;
132 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
134 assert (!(proto && has_constant));
137 /* The constant has to be a simple scalar type. */
138 switch (SvTYPE(has_constant)) {
144 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
145 sv_reftype(has_constant, 0));
151 sv_upgrade((SV*)gv, SVt_PVGV);
158 Safefree(SvPVX_mutable(gv));
161 GvGP(gv) = gp_ref(gp);
162 #ifdef PERL_DONT_CREATE_GVSV
165 GvSV(gv) = NEWSV(72,0);
167 GvLINE(gv) = CopLINE(PL_curcop);
168 /* XXX Ideally this cast would be replaced with a change to const char*
170 GvFILE(gv) = CopFILE(PL_curcop) ? CopFILE(PL_curcop) : (char *) "";
173 sv_magic((SV*)gv, (SV*)gv, PERL_MAGIC_glob, Nullch, 0);
176 Perl_sv_add_backref(aTHX_ (SV*)stash, (SV*)gv);
177 GvNAME(gv) = savepvn(name, len);
179 if (multi || doproto) /* doproto means it _was_ mentioned */
181 if (doproto) { /* Replicate part of newSUB here. */
185 /* newCONSTSUB takes ownership of the reference from us. */
186 GvCV(gv) = newCONSTSUB(stash, name, has_constant);
188 /* XXX unsafe for threads if eval_owner isn't held */
189 (void) start_subparse(0,0); /* Create empty CV in compcv. */
190 GvCV(gv) = PL_compcv;
196 CvFILE_set_from_cop(GvCV(gv), PL_curcop);
197 CvSTASH(GvCV(gv)) = PL_curstash;
199 sv_setpv((SV*)GvCV(gv), proto);
206 S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
218 #ifdef PERL_DONT_CREATE_GVSV
230 =for apidoc gv_fetchmeth
232 Returns the glob with the given C<name> and a defined subroutine or
233 C<NULL>. The glob lives in the given C<stash>, or in the stashes
234 accessible via @ISA and UNIVERSAL::.
236 The argument C<level> should be either 0 or -1. If C<level==0>, as a
237 side-effect creates a glob with the given C<name> in the given C<stash>
238 which in the case of success contains an alias for the subroutine, and sets
239 up caching info for this glob. Similarly for all the searched stashes.
241 This function grants C<"SUPER"> token as a postfix of the stash name. The
242 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
243 visible to Perl code. So when calling C<call_sv>, you should not use
244 the GV directly; instead, you should use the method's CV, which can be
245 obtained from the GV with the C<GvCV> macro.
251 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
260 /* UNIVERSAL methods should be callable without a stash */
262 level = -1; /* probably appropriate */
263 if(!(stash = gv_stashpvn("UNIVERSAL", 9, FALSE)))
267 hvname = HvNAME_get(stash);
270 "Can't use anonymous symbol table for method lookup");
272 if ((level > 100) || (level < -100))
273 Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
276 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
278 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
283 if (SvTYPE(topgv) != SVt_PVGV)
284 gv_init(topgv, stash, name, len, TRUE);
285 if ((cv = GvCV(topgv))) {
286 /* If genuine method or valid cache entry, use it */
287 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
289 /* Stale cached entry: junk it */
291 GvCV(topgv) = cv = Nullcv;
294 else if (GvCVGEN(topgv) == PL_sub_generation)
295 return 0; /* cache indicates sub doesn't exist */
298 gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE);
299 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : NULL;
301 /* create and re-create @.*::SUPER::ISA on demand */
302 if (!av || !SvMAGIC(av)) {
303 STRLEN packlen = HvNAMELEN_get(stash);
305 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
309 basestash = gv_stashpvn(hvname, packlen, TRUE);
310 gvp = (GV**)hv_fetch(basestash, "ISA", 3, FALSE);
311 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
312 gvp = (GV**)hv_fetch(stash, "ISA", 3, TRUE);
313 if (!gvp || !(gv = *gvp))
314 Perl_croak(aTHX_ "Cannot create %s::ISA", hvname);
315 if (SvTYPE(gv) != SVt_PVGV)
316 gv_init(gv, stash, "ISA", 3, TRUE);
317 SvREFCNT_dec(GvAV(gv));
318 GvAV(gv) = (AV*)SvREFCNT_inc(av);
324 SV** svp = AvARRAY(av);
325 /* NOTE: No support for tied ISA */
326 I32 items = AvFILLp(av) + 1;
328 SV* const sv = *svp++;
329 HV* const basestash = gv_stashsv(sv, FALSE);
331 if (ckWARN(WARN_MISC))
332 Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
336 gv = gv_fetchmeth(basestash, name, len,
337 (level >= 0) ? level + 1 : level - 1);
343 /* if at top level, try UNIVERSAL */
345 if (level == 0 || level == -1) {
346 HV* const lastchance = gv_stashpvn("UNIVERSAL", 9, FALSE);
349 if ((gv = gv_fetchmeth(lastchance, name, len,
350 (level >= 0) ? level + 1 : level - 1)))
354 * Cache method in topgv if:
355 * 1. topgv has no synonyms (else inheritance crosses wires)
356 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
359 GvREFCNT(topgv) == 1 &&
361 (CvROOT(cv) || CvXSUB(cv)))
363 if ((cv = GvCV(topgv)))
365 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
366 GvCVGEN(topgv) = PL_sub_generation;
370 else if (topgv && GvREFCNT(topgv) == 1) {
371 /* cache the fact that the method is not defined */
372 GvCVGEN(topgv) = PL_sub_generation;
381 =for apidoc gv_fetchmeth_autoload
383 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
384 Returns a glob for the subroutine.
386 For an autoloaded subroutine without a GV, will create a GV even
387 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
388 of the result may be zero.
394 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
396 GV *gv = gv_fetchmeth(stash, name, len, level);
403 return Nullgv; /* UNIVERSAL::AUTOLOAD could cause trouble */
404 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
406 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
409 if (!(CvROOT(cv) || CvXSUB(cv)))
411 /* Have an autoload */
412 if (level < 0) /* Cannot do without a stub */
413 gv_fetchmeth(stash, name, len, 0);
414 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
423 =for apidoc gv_fetchmethod_autoload
425 Returns the glob which contains the subroutine to call to invoke the method
426 on the C<stash>. In fact in the presence of autoloading this may be the
427 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
430 The third parameter of C<gv_fetchmethod_autoload> determines whether
431 AUTOLOAD lookup is performed if the given method is not present: non-zero
432 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
433 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
434 with a non-zero C<autoload> parameter.
436 These functions grant C<"SUPER"> token as a prefix of the method name. Note
437 that if you want to keep the returned glob for a long time, you need to
438 check for it being "AUTOLOAD", since at the later time the call may load a
439 different subroutine due to $AUTOLOAD changing its value. Use the glob
440 created via a side effect to do this.
442 These functions have the same side-effects and as C<gv_fetchmeth> with
443 C<level==0>. C<name> should be writable if contains C<':'> or C<'
444 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
445 C<call_sv> apply equally to these functions.
451 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
453 register const char *nend;
454 const char *nsplit = 0;
458 if (stash && SvTYPE(stash) < SVt_PVHV)
461 for (nend = name; *nend; nend++) {
464 else if (*nend == ':' && *(nend + 1) == ':')
468 const char * const origname = name;
472 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
473 /* ->SUPER::method should really be looked up in original stash */
474 SV *tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
475 CopSTASHPV(PL_curcop)));
476 /* __PACKAGE__::SUPER stash should be autovivified */
477 stash = gv_stashpvn(SvPVX_const(tmpstr), SvCUR(tmpstr), TRUE);
478 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
479 origname, HvNAME_get(stash), name) );
482 /* don't autovifify if ->NoSuchStash::method */
483 stash = gv_stashpvn(origname, nsplit - origname, FALSE);
485 /* however, explicit calls to Pkg::SUPER::method may
486 happen, and may require autovivification to work */
487 if (!stash && (nsplit - origname) >= 7 &&
488 strnEQ(nsplit - 7, "::SUPER", 7) &&
489 gv_stashpvn(origname, nsplit - origname - 7, FALSE))
490 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
495 gv = gv_fetchmeth(stash, name, nend - name, 0);
497 if (strEQ(name,"import") || strEQ(name,"unimport"))
498 gv = (GV*)&PL_sv_yes;
500 gv = gv_autoload4(ostash, name, nend - name, TRUE);
503 CV* const cv = GvCV(gv);
504 if (!CvROOT(cv) && !CvXSUB(cv)) {
512 if (GvCV(stubgv) != cv) /* orphaned import */
515 autogv = gv_autoload4(GvSTASH(stubgv),
516 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
526 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
534 const char *packname = "";
537 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
540 if (SvTYPE(stash) < SVt_PVHV) {
541 packname = SvPV_const((SV*)stash, packname_len);
545 packname = HvNAME_get(stash);
546 packname_len = HvNAMELEN_get(stash);
549 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
553 if (!(CvROOT(cv) || CvXSUB(cv)))
557 * Inheriting AUTOLOAD for non-methods works ... for now.
559 if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
560 && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)
562 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
563 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
564 packname, (int)len, name);
567 /* rather than lookup/init $AUTOLOAD here
568 * only to have the XSUB do another lookup for $AUTOLOAD
569 * and split that value on the last '::',
570 * pass along the same data via some unused fields in the CV
573 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
579 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
580 * The subroutine's original name may not be "AUTOLOAD", so we don't
581 * use that, but for lack of anything better we will use the sub's
582 * original package to look up $AUTOLOAD.
584 varstash = GvSTASH(CvGV(cv));
585 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
589 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
590 #ifdef PERL_DONT_CREATE_GVSV
591 GvSV(vargv) = NEWSV(72,0);
595 varsv = GvSVn(vargv);
596 sv_setpvn(varsv, packname, packname_len);
597 sv_catpvn(varsv, "::", 2);
598 sv_catpvn(varsv, name, len);
599 SvTAINTED_off(varsv);
603 /* The "gv" parameter should be the glob known to Perl code as *!
604 * The scalar must already have been magicalized.
607 S_require_errno(pTHX_ GV *gv)
610 HV* stash = gv_stashpvn("Errno",5,FALSE);
612 if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
616 save_scalar(gv); /* keep the value of $! */
617 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
618 newSVpvn("Errno",5), Nullsv);
621 stash = gv_stashpvn("Errno",5,FALSE);
622 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
623 Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available");
628 =for apidoc gv_stashpv
630 Returns a pointer to the stash for a specified package. C<name> should
631 be a valid UTF-8 string and must be null-terminated. If C<create> is set
632 then the package will be created if it does not already exist. If C<create>
633 is not set and the package does not exist then NULL is returned.
639 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
641 return gv_stashpvn(name, strlen(name), create);
645 =for apidoc gv_stashpvn
647 Returns a pointer to the stash for a specified package. C<name> should
648 be a valid UTF-8 string. The C<namelen> parameter indicates the length of
649 the C<name>, in bytes. If C<create> is set then the package will be
650 created if it does not already exist. If C<create> is not set and the
651 package does not exist then NULL is returned.
657 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
664 if (namelen + 3 < sizeof smallbuf)
667 Newx(tmpbuf, namelen + 3, char);
668 Copy(name,tmpbuf,namelen,char);
669 tmpbuf[namelen++] = ':';
670 tmpbuf[namelen++] = ':';
671 tmpbuf[namelen] = '\0';
672 tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV);
673 if (tmpbuf != smallbuf)
678 GvHV(tmpgv) = newHV();
680 if (!HvNAME_get(stash))
681 hv_name_set(stash, name, namelen, 0);
686 =for apidoc gv_stashsv
688 Returns a pointer to the stash for a specified package, which must be a
689 valid UTF-8 string. See C<gv_stashpv>.
695 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
698 const char * const ptr = SvPV_const(sv,len);
699 return gv_stashpvn(ptr, len, create);
704 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
705 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
709 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
711 const char * const nambeg = SvPV_const(name, len);
712 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
716 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
719 register const char *name = nambeg;
723 register const char *namend;
725 const I32 add = flags & ~SVf_UTF8;
727 PERL_UNUSED_ARG(full_len);
729 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
732 for (namend = name; *namend; namend++) {
733 if ((*namend == ':' && namend[1] == ':')
734 || (*namend == '\'' && namend[1]))
738 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
746 if (len + 3 < sizeof (smallbuf))
749 Newx(tmpbuf, len+3, char);
750 Copy(name, tmpbuf, len, char);
754 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
755 gv = gvp ? *gvp : Nullgv;
756 if (gv && gv != (GV*)&PL_sv_undef) {
757 if (SvTYPE(gv) != SVt_PVGV)
758 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
762 if (tmpbuf != smallbuf)
764 if (!gv || gv == (GV*)&PL_sv_undef)
767 if (!(stash = GvHV(gv)))
768 stash = GvHV(gv) = newHV();
770 if (!HvNAME_get(stash))
771 hv_name_set(stash, nambeg, namend - nambeg, 0);
779 return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE);
784 /* No stash in name, so see how we can default */
787 if (isIDFIRST_lazy(name)) {
790 /* name is always \0 terminated, and initial \0 wouldn't return
791 true from isIDFIRST_lazy, so we know that name[1] is defined */
798 if (strEQ(name, "INC") || strEQ(name, "ENV"))
802 if (strEQ(name, "SIG"))
806 if (strEQ(name, "STDIN") || strEQ(name, "STDOUT") ||
807 strEQ(name, "STDERR"))
811 if (strEQ(name, "ARGV") || strEQ(name, "ARGVOUT"))
818 else if (IN_PERL_COMPILETIME) {
820 if (add && (PL_hints & HINT_STRICT_VARS) &&
821 sv_type != SVt_PVCV &&
822 sv_type != SVt_PVGV &&
823 sv_type != SVt_PVFM &&
824 sv_type != SVt_PVIO &&
825 !(len == 1 && sv_type == SVt_PV &&
826 (*name == 'a' || *name == 'b')) )
828 gvp = (GV**)hv_fetch(stash,name,len,0);
830 *gvp == (GV*)&PL_sv_undef ||
831 SvTYPE(*gvp) != SVt_PVGV)
835 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
836 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
837 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
839 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
840 sv_type == SVt_PVAV ? '@' :
841 sv_type == SVt_PVHV ? '%' : '$',
844 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
850 stash = CopSTASH(PL_curcop);
856 /* By this point we should have a stash and a name */
860 SV * const err = Perl_mess(aTHX_
861 "Global symbol \"%s%s\" requires explicit package name",
862 (sv_type == SVt_PV ? "$"
863 : sv_type == SVt_PVAV ? "@"
864 : sv_type == SVt_PVHV ? "%"
866 if (USE_UTF8_IN_NAMES)
869 stash = GvHV(gv_fetchpv("<none>::", GV_ADDMULTI, SVt_PVHV));
875 if (!SvREFCNT(stash)) /* symbol table under destruction */
878 gvp = (GV**)hv_fetch(stash,name,len,add);
879 if (!gvp || *gvp == (GV*)&PL_sv_undef)
882 if (SvTYPE(gv) == SVt_PVGV) {
885 gv_init_sv(gv, sv_type);
886 if (*name=='!' && sv_type == SVt_PVHV && len==1)
890 } else if (add & GV_NOINIT) {
894 /* Adding a new symbol */
896 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
897 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
898 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
899 gv_init_sv(gv, sv_type);
901 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
902 : (PL_dowarn & G_WARN_ON ) ) )
905 /* set up magic where warranted */
909 /* Nothing else to do.
910 The compiler will probably turn the switch statement into a
911 branch table. Make sure we avoid even that small overhead for
912 the common case of lower case variable names. */
916 const char * const name2 = name + 1;
919 if (strEQ(name2, "RGV")) {
920 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
924 if (strnEQ(name2, "XPORT", 5))
928 if (strEQ(name2, "SA")) {
929 AV* const av = GvAVn(gv);
931 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, Nullch, 0);
932 /* NOTE: No support for tied ISA */
933 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
934 && AvFILLp(av) == -1)
937 av_push(av, newSVpvn(pname = "NDBM_File",9));
938 gv_stashpvn(pname, 9, TRUE);
939 av_push(av, newSVpvn(pname = "DB_File",7));
940 gv_stashpvn(pname, 7, TRUE);
941 av_push(av, newSVpvn(pname = "GDBM_File",9));
942 gv_stashpvn(pname, 9, TRUE);
943 av_push(av, newSVpvn(pname = "SDBM_File",9));
944 gv_stashpvn(pname, 9, TRUE);
945 av_push(av, newSVpvn(pname = "ODBM_File",9));
946 gv_stashpvn(pname, 9, TRUE);
951 if (strEQ(name2, "VERLOAD")) {
952 HV* const hv = GvHVn(gv);
954 hv_magic(hv, Nullgv, PERL_MAGIC_overload);
958 if (strEQ(name2, "IG")) {
962 Newxz(PL_psig_ptr, SIG_SIZE, SV*);
963 Newxz(PL_psig_name, SIG_SIZE, SV*);
964 Newxz(PL_psig_pend, SIG_SIZE, int);
968 hv_magic(hv, Nullgv, PERL_MAGIC_sig);
969 for (i = 1; i < SIG_SIZE; i++) {
970 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
972 sv_setsv(*init, &PL_sv_undef);
980 if (strEQ(name2, "ERSION"))
983 case '\003': /* $^CHILD_ERROR_NATIVE */
984 if (strEQ(name2, "HILD_ERROR_NATIVE"))
987 case '\005': /* $^ENCODING */
988 if (strEQ(name2, "NCODING"))
991 case '\017': /* $^OPEN */
992 if (strEQ(name2, "PEN"))
995 case '\024': /* ${^TAINT} */
996 if (strEQ(name2, "AINT"))
999 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1000 if (strEQ(name2, "NICODE"))
1002 if (strEQ(name2, "TF8LOCALE"))
1005 case '\027': /* $^WARNING_BITS */
1006 if (strEQ(name2, "ARNING_BITS"))
1019 /* ensures variable is only digits */
1020 /* ${"1foo"} fails this test (and is thus writeable) */
1021 /* added by japhy, but borrowed from is_gv_magical */
1022 const char *end = name + len;
1023 while (--end > name) {
1024 if (!isDIGIT(*end)) return gv;
1031 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1032 be case '\0' in this switch statement (ie a default case) */
1038 sv_type == SVt_PVAV ||
1039 sv_type == SVt_PVHV ||
1040 sv_type == SVt_PVCV ||
1041 sv_type == SVt_PVFM ||
1044 PL_sawampersand = TRUE;
1048 sv_setpv(GvSVn(gv),PL_chopset);
1052 #ifdef COMPLEX_STATUS
1053 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1059 /* If %! has been used, automatically load Errno.pm.
1060 The require will itself set errno, so in order to
1061 preserve its value we have to set up the magic
1062 now (rather than going to magicalize)
1065 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1067 if (sv_type == SVt_PVHV)
1073 AV* const av = GvAVn(gv);
1074 sv_magic((SV*)av, Nullsv, PERL_MAGIC_regdata, Nullch, 0);
1080 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1081 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1082 "$%c is no longer supported", *name);
1085 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1090 AV* const av = GvAVn(gv);
1091 sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, Nullch, 0);
1095 case '\023': /* $^S */
1106 SvREADONLY_on(GvSVn(gv));
1121 case '\001': /* $^A */
1122 case '\003': /* $^C */
1123 case '\004': /* $^D */
1124 case '\005': /* $^E */
1125 case '\006': /* $^F */
1126 case '\010': /* $^H */
1127 case '\011': /* $^I, NOT \t in EBCDIC */
1128 case '\016': /* $^N */
1129 case '\017': /* $^O */
1130 case '\020': /* $^P */
1131 case '\024': /* $^T */
1132 case '\027': /* $^W */
1134 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1137 case '\014': /* $^L */
1138 sv_setpvn(GvSVn(gv),"\f",1);
1139 PL_formfeed = GvSVn(gv);
1142 sv_setpvn(GvSVn(gv),"\034",1);
1146 SV * const sv = GvSVn(gv);
1147 if (!sv_derived_from(PL_patchlevel, "version"))
1148 (void *)upg_version(PL_patchlevel);
1149 GvSV(gv) = vnumify(PL_patchlevel);
1150 SvREADONLY_on(GvSV(gv));
1154 case '\026': /* $^V */
1156 SV * const sv = GvSVn(gv);
1157 GvSV(gv) = new_version(PL_patchlevel);
1158 SvREADONLY_on(GvSV(gv));
1168 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1172 const HV * const hv = GvSTASH(gv);
1177 sv_setpv(sv, prefix ? prefix : "");
1179 name = HvNAME_get(hv);
1181 namelen = HvNAMELEN_get(hv);
1187 if (keepmain || strNE(name, "main")) {
1188 sv_catpvn(sv,name,namelen);
1189 sv_catpvn(sv,"::", 2);
1191 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1195 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1197 const GV * const egv = GvEGV(gv);
1198 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1205 IO * const io = (IO*)NEWSV(0,0);
1207 sv_upgrade((SV *)io,SVt_PVIO);
1208 /* This used to read SvREFCNT(io) = 1;
1209 It's not clear why the reference count needed an explicit reset. NWC
1211 assert (SvREFCNT(io) == 1);
1213 /* Clear the stashcache because a new IO could overrule a package name */
1214 hv_clear(PL_stashcache);
1215 iogv = gv_fetchpv("FileHandle::", 0, SVt_PVHV);
1216 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1217 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1218 iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV);
1219 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1224 Perl_gv_check(pTHX_ HV *stash)
1228 if (!HvARRAY(stash))
1230 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1232 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1235 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1236 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1238 if (hv != PL_defstash && hv != stash)
1239 gv_check(hv); /* nested package */
1241 else if (isALPHA(*HeKEY(entry))) {
1243 gv = (GV*)HeVAL(entry);
1244 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1247 /* performance hack: if filename is absolute and it's a standard
1248 * module, don't bother warning */
1249 #ifdef MACOS_TRADITIONAL
1250 # define LIB_COMPONENT ":lib:"
1252 # define LIB_COMPONENT "/lib/"
1255 && PERL_FILE_IS_ABSOLUTE(file)
1256 && (instr(file, LIB_COMPONENT) || instr(file, ".pm")))
1260 CopLINE_set(PL_curcop, GvLINE(gv));
1262 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1264 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1266 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1267 "Name \"%s::%s\" used only once: possible typo",
1268 HvNAME_get(stash), GvNAME(gv));
1275 Perl_newGVgen(pTHX_ const char *pack)
1277 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1281 /* hopefully this is only called on local symbol table entries */
1284 Perl_gp_ref(pTHX_ GP *gp)
1291 /* multi-named GPs cannot be used for method cache */
1292 SvREFCNT_dec(gp->gp_cv);
1297 /* Adding a new name to a subroutine invalidates method cache */
1298 PL_sub_generation++;
1305 Perl_gp_free(pTHX_ GV *gv)
1309 if (!gv || !(gp = GvGP(gv)))
1311 if (gp->gp_refcnt == 0) {
1312 if (ckWARN_d(WARN_INTERNAL))
1313 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1314 "Attempt to free unreferenced glob pointers"
1315 pTHX__FORMAT pTHX__VALUE);
1319 /* Deleting the name of a subroutine invalidates method cache */
1320 PL_sub_generation++;
1322 if (--gp->gp_refcnt > 0) {
1323 if (gp->gp_egv == gv)
1328 if (gp->gp_sv) SvREFCNT_dec(gp->gp_sv);
1329 if (gp->gp_av) SvREFCNT_dec(gp->gp_av);
1330 /* FIXME - another reference loop GV -> symtab -> GV ?
1331 Somehow gp->gp_hv can end up pointing at freed garbage. */
1332 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1333 const char *hvname = HvNAME_get(gp->gp_hv);
1334 if (PL_stashcache && hvname)
1335 hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv),
1337 SvREFCNT_dec(gp->gp_hv);
1339 if (gp->gp_io) SvREFCNT_dec(gp->gp_io);
1340 if (gp->gp_cv) SvREFCNT_dec(gp->gp_cv);
1341 if (gp->gp_form) SvREFCNT_dec(gp->gp_form);
1348 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1350 AMT * const amtp = (AMT*)mg->mg_ptr;
1351 PERL_UNUSED_ARG(sv);
1353 if (amtp && AMT_AMAGIC(amtp)) {
1355 for (i = 1; i < NofAMmeth; i++) {
1356 CV * const cv = amtp->table[i];
1358 SvREFCNT_dec((SV *) cv);
1359 amtp->table[i] = Nullcv;
1366 /* Updates and caches the CV's */
1369 Perl_Gv_AMupdate(pTHX_ HV *stash)
1371 MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1372 AMT * const amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
1375 if (mg && amtp->was_ok_am == PL_amagic_generation
1376 && amtp->was_ok_sub == PL_sub_generation)
1377 return (bool)AMT_OVERLOADED(amtp);
1378 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1380 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1383 amt.was_ok_am = PL_amagic_generation;
1384 amt.was_ok_sub = PL_sub_generation;
1385 amt.fallback = AMGfallNO;
1389 int filled = 0, have_ovl = 0;
1392 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1394 /* Try to find via inheritance. */
1395 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1396 SV * const sv = gv ? GvSV(gv) : NULL;
1400 lim = DESTROY_amg; /* Skip overloading entries. */
1401 #ifdef PERL_DONT_CREATE_GVSV
1403 /* Equivalent to !SvTRUE and !SvOK */
1406 else if (SvTRUE(sv))
1407 amt.fallback=AMGfallYES;
1409 amt.fallback=AMGfallNEVER;
1411 for (i = 1; i < lim; i++)
1412 amt.table[i] = Nullcv;
1413 for (; i < NofAMmeth; i++) {
1414 const char *cooky = PL_AMG_names[i];
1415 /* Human-readable form, for debugging: */
1416 const char *cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1417 const STRLEN l = strlen(cooky);
1419 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1420 cp, HvNAME_get(stash)) );
1421 /* don't fill the cache while looking up!
1422 Creation of inheritance stubs in intermediate packages may
1423 conflict with the logic of runtime method substitution.
1424 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1425 then we could have created stubs for "(+0" in A and C too.
1426 But if B overloads "bool", we may want to use it for
1427 numifying instead of C's "+0". */
1428 if (i >= DESTROY_amg)
1429 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1430 else /* Autoload taken care of below */
1431 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1433 if (gv && (cv = GvCV(gv))) {
1435 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1436 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1437 /* This is a hack to support autoloading..., while
1438 knowing *which* methods were declared as overloaded. */
1439 /* GvSV contains the name of the method. */
1441 SV *gvsv = GvSV(gv);
1443 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1444 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1445 GvSV(gv), cp, hvname) );
1446 if (!gvsv || !SvPOK(gvsv)
1447 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1450 /* Can be an import stub (created by "can"). */
1451 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1452 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1453 "in package \"%.256s\"",
1454 (GvCVGEN(gv) ? "Stub found while resolving"
1458 cv = GvCV(gv = ngv);
1460 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1461 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1462 GvNAME(CvGV(cv))) );
1464 if (i < DESTROY_amg)
1466 } else if (gv) { /* Autoloaded... */
1470 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1473 AMT_AMAGIC_on(&amt);
1475 AMT_OVERLOADED_on(&amt);
1476 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1477 (char*)&amt, sizeof(AMT));
1481 /* Here we have no table: */
1483 AMT_AMAGIC_off(&amt);
1484 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1485 (char*)&amt, sizeof(AMTS));
1491 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1496 if (!stash || !HvNAME_get(stash))
1498 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1502 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1504 amtp = (AMT*)mg->mg_ptr;
1505 if ( amtp->was_ok_am != PL_amagic_generation
1506 || amtp->was_ok_sub != PL_sub_generation )
1508 if (AMT_AMAGIC(amtp)) {
1509 CV * const ret = amtp->table[id];
1510 if (ret && isGV(ret)) { /* Autoloading stab */
1511 /* Passing it through may have resulted in a warning
1512 "Inherited AUTOLOAD for a non-method deprecated", since
1513 our caller is going through a function call, not a method call.
1514 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1515 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1528 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1533 CV **cvp=NULL, **ocvp=NULL;
1534 AMT *amtp=NULL, *oamtp=NULL;
1535 int off = 0, off1, lr = 0, notfound = 0;
1536 int postpr = 0, force_cpy = 0;
1537 int assign = AMGf_assign & flags;
1538 const int assignshift = assign ? 1 : 0;
1543 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1544 && (stash = SvSTASH(SvRV(left)))
1545 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1546 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1547 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1549 && ((cv = cvp[off=method+assignshift])
1550 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1556 cv = cvp[off=method])))) {
1557 lr = -1; /* Call method for left argument */
1559 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1562 /* look for substituted methods */
1563 /* In all the covered cases we should be called with assign==0. */
1567 if ((cv = cvp[off=add_ass_amg])
1568 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1569 right = &PL_sv_yes; lr = -1; assign = 1;
1574 if ((cv = cvp[off = subtr_ass_amg])
1575 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1576 right = &PL_sv_yes; lr = -1; assign = 1;
1580 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1583 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1586 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1589 (void)((cv = cvp[off=bool__amg])
1590 || (cv = cvp[off=numer_amg])
1591 || (cv = cvp[off=string_amg]));
1597 * SV* ref causes confusion with the interpreter variable of
1600 SV* const tmpRef=SvRV(left);
1601 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1603 * Just to be extra cautious. Maybe in some
1604 * additional cases sv_setsv is safe, too.
1606 SV* const newref = newSVsv(tmpRef);
1607 SvOBJECT_on(newref);
1608 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1614 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1615 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1616 SV* const nullsv=sv_2mortal(newSViv(0));
1618 SV* const lessp = amagic_call(left,nullsv,
1619 lt_amg,AMGf_noright);
1620 logic = SvTRUE(lessp);
1622 SV* const lessp = amagic_call(left,nullsv,
1623 ncmp_amg,AMGf_noright);
1624 logic = (SvNV(lessp) < 0);
1627 if (off==subtr_amg) {
1638 if ((cv = cvp[off=subtr_amg])) {
1640 left = sv_2mortal(newSViv(0));
1645 case iter_amg: /* XXXX Eventually should do to_gv. */
1647 return NULL; /* Delegate operation to standard mechanisms. */
1655 return left; /* Delegate operation to standard mechanisms. */
1660 if (!cv) goto not_found;
1661 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1662 && (stash = SvSTASH(SvRV(right)))
1663 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1664 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1665 ? (amtp = (AMT*)mg->mg_ptr)->table
1667 && (cv = cvp[off=method])) { /* Method for right
1670 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1671 && (cvp=ocvp) && (lr = -1))
1672 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1673 && !(flags & AMGf_unary)) {
1674 /* We look for substitution for
1675 * comparison operations and
1677 if (method==concat_amg || method==concat_ass_amg
1678 || method==repeat_amg || method==repeat_ass_amg) {
1679 return NULL; /* Delegate operation to string conversion */
1689 postpr = 1; off=ncmp_amg; break;
1696 postpr = 1; off=scmp_amg; break;
1698 if (off != -1) cv = cvp[off];
1703 not_found: /* No method found, either report or croak */
1711 return left; /* Delegate operation to standard mechanisms. */
1714 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1715 notfound = 1; lr = -1;
1716 } else if (cvp && (cv=cvp[nomethod_amg])) {
1717 notfound = 1; lr = 1;
1720 if (off==-1) off=method;
1721 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1722 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1723 AMG_id2name(method + assignshift),
1724 (flags & AMGf_unary ? " " : "\n\tleft "),
1726 "in overloaded package ":
1727 "has no overloaded magic",
1729 HvNAME_get(SvSTASH(SvRV(left))):
1732 ",\n\tright argument in overloaded package ":
1735 : ",\n\tright argument has no overloaded magic"),
1737 HvNAME_get(SvSTASH(SvRV(right))):
1739 if (amtp && amtp->fallback >= AMGfallYES) {
1740 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1742 Perl_croak(aTHX_ "%"SVf, msg);
1746 force_cpy = force_cpy || assign;
1751 DEBUG_o(Perl_deb(aTHX_
1752 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1754 method+assignshift==off? "" :
1756 method+assignshift==off? "" :
1757 AMG_id2name(method+assignshift),
1758 method+assignshift==off? "" : "\")",
1759 flags & AMGf_unary? "" :
1760 lr==1 ? " for right argument": " for left argument",
1761 flags & AMGf_unary? " for argument" : "",
1762 stash ? HvNAME_get(stash) : "null",
1763 fl? ",\n\tassignment variant used": "") );
1766 /* Since we use shallow copy during assignment, we need
1767 * to dublicate the contents, probably calling user-supplied
1768 * version of copy operator
1770 /* We need to copy in following cases:
1771 * a) Assignment form was called.
1772 * assignshift==1, assign==T, method + 1 == off
1773 * b) Increment or decrement, called directly.
1774 * assignshift==0, assign==0, method + 0 == off
1775 * c) Increment or decrement, translated to assignment add/subtr.
1776 * assignshift==0, assign==T,
1778 * d) Increment or decrement, translated to nomethod.
1779 * assignshift==0, assign==0,
1781 * e) Assignment form translated to nomethod.
1782 * assignshift==1, assign==T, method + 1 != off
1785 /* off is method, method+assignshift, or a result of opcode substitution.
1786 * In the latter case assignshift==0, so only notfound case is important.
1788 if (( (method + assignshift == off)
1789 && (assign || (method == inc_amg) || (method == dec_amg)))
1796 const bool oldcatch = CATCH_GET;
1799 Zero(&myop, 1, BINOP);
1800 myop.op_last = (OP *) &myop;
1801 myop.op_next = Nullop;
1802 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1804 PUSHSTACKi(PERLSI_OVERLOAD);
1807 PL_op = (OP *) &myop;
1808 if (PERLDB_SUB && PL_curstash != PL_debstash)
1809 PL_op->op_private |= OPpENTERSUB_DB;
1813 EXTEND(SP, notfound + 5);
1814 PUSHs(lr>0? right: left);
1815 PUSHs(lr>0? left: right);
1816 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1818 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1823 if ((PL_op = Perl_pp_entersub(aTHX)))
1831 CATCH_SET(oldcatch);
1838 ans=SvIV(res)<=0; break;
1841 ans=SvIV(res)<0; break;
1844 ans=SvIV(res)>=0; break;
1847 ans=SvIV(res)>0; break;
1850 ans=SvIV(res)==0; break;
1853 ans=SvIV(res)!=0; break;
1856 SvSetSV(left,res); return left;
1858 ans=!SvTRUE(res); break;
1863 } else if (method==copy_amg) {
1865 Perl_croak(aTHX_ "Copy method did not return a reference");
1867 return SvREFCNT_inc(SvRV(res));
1875 =for apidoc is_gv_magical_sv
1877 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
1883 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
1886 const char * const temp = SvPV_const(name, len);
1887 return is_gv_magical(temp, len, flags);
1891 =for apidoc is_gv_magical
1893 Returns C<TRUE> if given the name of a magical GV.
1895 Currently only useful internally when determining if a GV should be
1896 created even in rvalue contexts.
1898 C<flags> is not used at present but available for future extension to
1899 allow selecting particular classes of magical variable.
1901 Currently assumes that C<name> is NUL terminated (as well as len being valid).
1902 This assumption is met by all callers within the perl core, which all pass
1903 pointers returned by SvPV.
1908 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
1910 PERL_UNUSED_ARG(flags);
1913 const char * const name1 = name + 1;
1916 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
1920 if (len == 8 && strEQ(name1, "VERLOAD"))
1924 if (len == 3 && name[1] == 'I' && name[2] == 'G')
1927 /* Using ${^...} variables is likely to be sufficiently rare that
1928 it seems sensible to avoid the space hit of also checking the
1930 case '\017': /* ${^OPEN} */
1931 if (strEQ(name1, "PEN"))
1934 case '\024': /* ${^TAINT} */
1935 if (strEQ(name1, "AINT"))
1938 case '\025': /* ${^UNICODE} */
1939 if (strEQ(name1, "NICODE"))
1941 if (strEQ(name1, "TF8LOCALE"))
1944 case '\027': /* ${^WARNING_BITS} */
1945 if (strEQ(name1, "ARNING_BITS"))
1958 const char *end = name + len;
1959 while (--end > name) {
1967 /* Because we're already assuming that name is NUL terminated
1968 below, we can treat an empty name as "\0" */
1995 case '\001': /* $^A */
1996 case '\003': /* $^C */
1997 case '\004': /* $^D */
1998 case '\005': /* $^E */
1999 case '\006': /* $^F */
2000 case '\010': /* $^H */
2001 case '\011': /* $^I, NOT \t in EBCDIC */
2002 case '\014': /* $^L */
2003 case '\016': /* $^N */
2004 case '\017': /* $^O */
2005 case '\020': /* $^P */
2006 case '\023': /* $^S */
2007 case '\024': /* $^T */
2008 case '\026': /* $^V */
2009 case '\027': /* $^W */
2030 * c-indentation-style: bsd
2032 * indent-tabs-mode: t
2035 * ex: set ts=8 sts=4 sw=4 noet: