3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 * 2000, 2001, 2002, 2003, 2004, 2005, 2006, 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 $foo, @foo, %foo.
27 GVs are usually found as values in stashes (symbol table hashes) where
28 Perl stores its global variables.
37 static const char S_autoload[] = "AUTOLOAD";
38 static const STRLEN S_autolen = sizeof(S_autoload)-1;
41 #ifdef PERL_DONT_CREATE_GVSV
43 Perl_gv_SVadd(pTHX_ GV *gv)
45 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
46 Perl_croak(aTHX_ "Bad symbol for scalar");
54 Perl_gv_AVadd(pTHX_ register GV *gv)
56 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
57 Perl_croak(aTHX_ "Bad symbol for array");
64 Perl_gv_HVadd(pTHX_ register GV *gv)
66 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
67 Perl_croak(aTHX_ "Bad symbol for hash");
74 Perl_gv_IOadd(pTHX_ register GV *gv)
77 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) {
80 * if it walks like a dirhandle, then let's assume that
81 * this is a dirhandle.
83 const char *fh = PL_op->op_type == OP_READDIR ||
84 PL_op->op_type == OP_TELLDIR ||
85 PL_op->op_type == OP_SEEKDIR ||
86 PL_op->op_type == OP_REWINDDIR ||
87 PL_op->op_type == OP_CLOSEDIR ?
88 "dirhandle" : "filehandle";
89 Perl_croak(aTHX_ "Bad symbol for %s", fh);
93 #ifdef GV_UNIQUE_CHECK
95 Perl_croak(aTHX_ "Bad symbol for filehandle (GV is unique)");
104 Perl_gv_fetchfile(pTHX_ const char *name)
115 tmplen = strlen(name) + 2;
116 if (tmplen < sizeof smallbuf)
119 Newx(tmpbuf, tmplen + 1, char);
120 /* This is where the debugger's %{"::_<$filename"} hash is created */
123 memcpy(tmpbuf + 2, name, tmplen - 1);
124 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
126 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
127 #ifdef PERL_DONT_CREATE_GVSV
128 GvSV(gv) = newSVpvn(name, tmplen - 2);
130 sv_setpvn(GvSV(gv), name, tmplen - 2);
133 hv_magic(GvHVn(gv_AVadd(gv)), Nullgv, PERL_MAGIC_dbfile);
135 if (tmpbuf != smallbuf)
141 =for apidoc gv_const_sv
143 If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
144 inlining, or C<gv> is a placeholder reference that would be promoted to such
145 a typeglob, then returns the value returned by the sub. Otherwise, returns
152 Perl_gv_const_sv(pTHX_ GV *gv)
154 if (SvTYPE(gv) == SVt_PVGV)
155 return cv_const_sv(GvCVu(gv));
156 return SvROK(gv) ? SvRV(gv) : NULL;
160 Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
164 const bool doproto = SvTYPE(gv) > SVt_NULL;
165 const char * const proto = (doproto && SvPOK(gv)) ? SvPVX_const(gv) : NULL;
166 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
168 assert (!(proto && has_constant));
171 /* The constant has to be a simple scalar type. */
172 switch (SvTYPE(has_constant)) {
178 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
179 sv_reftype(has_constant, 0));
185 sv_upgrade((SV*)gv, SVt_PVGV);
192 Safefree(SvPVX_mutable(gv));
195 GvGP(gv) = gp_ref(gp);
196 #ifdef PERL_DONT_CREATE_GVSV
201 GvLINE(gv) = CopLINE(PL_curcop);
202 /* XXX Ideally this cast would be replaced with a change to const char*
204 GvFILE(gv) = CopFILE(PL_curcop) ? CopFILE(PL_curcop) : (char *) "";
207 sv_magic((SV*)gv, (SV*)gv, PERL_MAGIC_glob, Nullch, 0);
210 Perl_sv_add_backref(aTHX_ (SV*)stash, (SV*)gv);
211 GvNAME(gv) = savepvn(name, len);
213 if (multi || doproto) /* doproto means it _was_ mentioned */
215 if (doproto) { /* Replicate part of newSUB here. */
219 /* newCONSTSUB takes ownership of the reference from us. */
220 GvCV(gv) = newCONSTSUB(stash, name, has_constant);
222 /* XXX unsafe for threads if eval_owner isn't held */
223 (void) start_subparse(0,0); /* Create empty CV in compcv. */
224 GvCV(gv) = PL_compcv;
230 CvFILE_set_from_cop(GvCV(gv), PL_curcop);
231 CvSTASH(GvCV(gv)) = PL_curstash;
233 sv_setpv((SV*)GvCV(gv), proto);
240 S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
252 #ifdef PERL_DONT_CREATE_GVSV
265 =for apidoc gv_fetchmeth
267 Returns the glob with the given C<name> and a defined subroutine or
268 C<NULL>. The glob lives in the given C<stash>, or in the stashes
269 accessible via @ISA and UNIVERSAL::.
271 The argument C<level> should be either 0 or -1. If C<level==0>, as a
272 side-effect creates a glob with the given C<name> in the given C<stash>
273 which in the case of success contains an alias for the subroutine, and sets
274 up caching info for this glob. Similarly for all the searched stashes.
276 This function grants C<"SUPER"> token as a postfix of the stash name. The
277 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
278 visible to Perl code. So when calling C<call_sv>, you should not use
279 the GV directly; instead, you should use the method's CV, which can be
280 obtained from the GV with the C<GvCV> macro.
286 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
296 /* UNIVERSAL methods should be callable without a stash */
298 level = -1; /* probably appropriate */
299 if(!(stash = gv_stashpvs("UNIVERSAL", FALSE)))
303 hvname = HvNAME_get(stash);
306 "Can't use anonymous symbol table for method lookup");
308 if ((level > 100) || (level < -100))
309 Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
312 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
314 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
319 if (SvTYPE(topgv) != SVt_PVGV)
320 gv_init(topgv, stash, name, len, TRUE);
321 if ((cv = GvCV(topgv))) {
322 /* If genuine method or valid cache entry, use it */
323 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
325 /* Stale cached entry: junk it */
327 GvCV(topgv) = cv = Nullcv;
330 else if (GvCVGEN(topgv) == PL_sub_generation)
331 return 0; /* cache indicates sub doesn't exist */
334 gvp = (GV**)hv_fetchs(stash, "ISA", FALSE);
335 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : NULL;
337 /* create and re-create @.*::SUPER::ISA on demand */
338 if (!av || !SvMAGIC(av)) {
339 STRLEN packlen = HvNAMELEN_get(stash);
341 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
345 basestash = gv_stashpvn(hvname, packlen, TRUE);
346 gvp = (GV**)hv_fetchs(basestash, "ISA", FALSE);
347 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
348 gvp = (GV**)hv_fetchs(stash, "ISA", TRUE);
349 if (!gvp || !(gv = *gvp))
350 Perl_croak(aTHX_ "Cannot create %s::ISA", hvname);
351 if (SvTYPE(gv) != SVt_PVGV)
352 gv_init(gv, stash, "ISA", 3, TRUE);
353 SvREFCNT_dec(GvAV(gv));
354 GvAV(gv) = (AV*)SvREFCNT_inc(av);
360 SV** svp = AvARRAY(av);
361 /* NOTE: No support for tied ISA */
362 I32 items = AvFILLp(av) + 1;
364 SV* const sv = *svp++;
365 HV* const basestash = gv_stashsv(sv, FALSE);
367 if (ckWARN(WARN_MISC))
368 Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
372 gv = gv_fetchmeth(basestash, name, len,
373 (level >= 0) ? level + 1 : level - 1);
379 /* if at top level, try UNIVERSAL */
381 if (level == 0 || level == -1) {
382 HV* const lastchance = gv_stashpvs("UNIVERSAL", FALSE);
385 if ((gv = gv_fetchmeth(lastchance, name, len,
386 (level >= 0) ? level + 1 : level - 1)))
390 * Cache method in topgv if:
391 * 1. topgv has no synonyms (else inheritance crosses wires)
392 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
395 GvREFCNT(topgv) == 1 &&
397 (CvROOT(cv) || CvXSUB(cv)))
399 if ((cv = GvCV(topgv)))
401 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
402 GvCVGEN(topgv) = PL_sub_generation;
406 else if (topgv && GvREFCNT(topgv) == 1) {
407 /* cache the fact that the method is not defined */
408 GvCVGEN(topgv) = PL_sub_generation;
417 =for apidoc gv_fetchmeth_autoload
419 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
420 Returns a glob for the subroutine.
422 For an autoloaded subroutine without a GV, will create a GV even
423 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
424 of the result may be zero.
430 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
432 GV *gv = gv_fetchmeth(stash, name, len, level);
439 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
440 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
442 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
445 if (!(CvROOT(cv) || CvXSUB(cv)))
447 /* Have an autoload */
448 if (level < 0) /* Cannot do without a stub */
449 gv_fetchmeth(stash, name, len, 0);
450 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
459 =for apidoc gv_fetchmethod_autoload
461 Returns the glob which contains the subroutine to call to invoke the method
462 on the C<stash>. In fact in the presence of autoloading this may be the
463 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
466 The third parameter of C<gv_fetchmethod_autoload> determines whether
467 AUTOLOAD lookup is performed if the given method is not present: non-zero
468 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
469 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
470 with a non-zero C<autoload> parameter.
472 These functions grant C<"SUPER"> token as a prefix of the method name. Note
473 that if you want to keep the returned glob for a long time, you need to
474 check for it being "AUTOLOAD", since at the later time the call may load a
475 different subroutine due to $AUTOLOAD changing its value. Use the glob
476 created via a side effect to do this.
478 These functions have the same side-effects and as C<gv_fetchmeth> with
479 C<level==0>. C<name> should be writable if contains C<':'> or C<'
480 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
481 C<call_sv> apply equally to these functions.
487 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
490 register const char *nend;
491 const char *nsplit = NULL;
495 if (stash && SvTYPE(stash) < SVt_PVHV)
498 for (nend = name; *nend; nend++) {
501 else if (*nend == ':' && *(nend + 1) == ':')
505 const char * const origname = name;
509 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
510 /* ->SUPER::method should really be looked up in original stash */
511 SV *tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
512 CopSTASHPV(PL_curcop)));
513 /* __PACKAGE__::SUPER stash should be autovivified */
514 stash = gv_stashpvn(SvPVX_const(tmpstr), SvCUR(tmpstr), TRUE);
515 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
516 origname, HvNAME_get(stash), name) );
519 /* don't autovifify if ->NoSuchStash::method */
520 stash = gv_stashpvn(origname, nsplit - origname, FALSE);
522 /* however, explicit calls to Pkg::SUPER::method may
523 happen, and may require autovivification to work */
524 if (!stash && (nsplit - origname) >= 7 &&
525 strnEQ(nsplit - 7, "::SUPER", 7) &&
526 gv_stashpvn(origname, nsplit - origname - 7, FALSE))
527 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
532 gv = gv_fetchmeth(stash, name, nend - name, 0);
534 if (strEQ(name,"import") || strEQ(name,"unimport"))
535 gv = (GV*)&PL_sv_yes;
537 gv = gv_autoload4(ostash, name, nend - name, TRUE);
540 CV* const cv = GvCV(gv);
541 if (!CvROOT(cv) && !CvXSUB(cv)) {
549 if (GvCV(stubgv) != cv) /* orphaned import */
552 autogv = gv_autoload4(GvSTASH(stubgv),
553 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
563 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
571 const char *packname = "";
574 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
577 if (SvTYPE(stash) < SVt_PVHV) {
578 packname = SvPV_const((SV*)stash, packname_len);
582 packname = HvNAME_get(stash);
583 packname_len = HvNAMELEN_get(stash);
586 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
590 if (!(CvROOT(cv) || CvXSUB(cv)))
594 * Inheriting AUTOLOAD for non-methods works ... for now.
596 if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
597 && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)
599 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
600 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
601 packname, (int)len, name);
604 /* rather than lookup/init $AUTOLOAD here
605 * only to have the XSUB do another lookup for $AUTOLOAD
606 * and split that value on the last '::',
607 * pass along the same data via some unused fields in the CV
610 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
616 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
617 * The subroutine's original name may not be "AUTOLOAD", so we don't
618 * use that, but for lack of anything better we will use the sub's
619 * original package to look up $AUTOLOAD.
621 varstash = GvSTASH(CvGV(cv));
622 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
626 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
627 #ifdef PERL_DONT_CREATE_GVSV
628 GvSV(vargv) = newSV(0);
632 varsv = GvSVn(vargv);
633 sv_setpvn(varsv, packname, packname_len);
634 sv_catpvs(varsv, "::");
635 sv_catpvn(varsv, name, len);
636 SvTAINTED_off(varsv);
640 /* The "gv" parameter should be the glob known to Perl code as *!
641 * The scalar must already have been magicalized.
644 S_require_errno(pTHX_ GV *gv)
647 HV* stash = gv_stashpvs("Errno", FALSE);
649 if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
653 save_scalar(gv); /* keep the value of $! */
654 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
655 newSVpvs("Errno"), Nullsv);
658 stash = gv_stashpvs("Errno", FALSE);
659 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
660 Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available");
665 =for apidoc gv_stashpv
667 Returns a pointer to the stash for a specified package. C<name> should
668 be a valid UTF-8 string and must be null-terminated. If C<create> is set
669 then the package will be created if it does not already exist. If C<create>
670 is not set and the package does not exist then NULL is returned.
676 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
678 return gv_stashpvn(name, strlen(name), create);
682 =for apidoc gv_stashpvn
684 Returns a pointer to the stash for a specified package. C<name> should
685 be a valid UTF-8 string. The C<namelen> parameter indicates the length of
686 the C<name>, in bytes. If C<create> is set then the package will be
687 created if it does not already exist. If C<create> is not set and the
688 package does not exist then NULL is returned.
694 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
701 if (namelen + 3 < sizeof smallbuf)
704 Newx(tmpbuf, namelen + 3, char);
705 Copy(name,tmpbuf,namelen,char);
706 tmpbuf[namelen++] = ':';
707 tmpbuf[namelen++] = ':';
708 tmpbuf[namelen] = '\0';
709 tmpgv = gv_fetchpvn_flags(tmpbuf, namelen, create, SVt_PVHV);
710 if (tmpbuf != smallbuf)
715 GvHV(tmpgv) = newHV();
717 if (!HvNAME_get(stash))
718 hv_name_set(stash, name, namelen, 0);
723 =for apidoc gv_stashsv
725 Returns a pointer to the stash for a specified package, which must be a
726 valid UTF-8 string. See C<gv_stashpv>.
732 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
735 const char * const ptr = SvPV_const(sv,len);
736 return gv_stashpvn(ptr, len, create);
741 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
742 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
746 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
748 const char * const nambeg = SvPV_const(name, len);
749 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
753 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
757 register const char *name = nambeg;
758 register GV *gv = NULL;
761 register const char *namend;
763 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
764 const I32 no_expand = flags & GV_NOEXPAND;
765 const I32 add = flags & ~SVf_UTF8 & ~GV_NOADD_NOINIT & ~GV_NOEXPAND;
767 PERL_UNUSED_ARG(full_len);
769 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
772 for (namend = name; *namend; namend++) {
773 if ((*namend == ':' && namend[1] == ':')
774 || (*namend == '\'' && namend[1]))
778 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
786 if (len + 3 < sizeof (smallbuf))
789 Newx(tmpbuf, len+3, char);
790 Copy(name, tmpbuf, len, char);
794 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
795 gv = gvp ? *gvp : Nullgv;
796 if (gv && gv != (GV*)&PL_sv_undef) {
797 if (SvTYPE(gv) != SVt_PVGV)
798 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
802 if (tmpbuf != smallbuf)
804 if (!gv || gv == (GV*)&PL_sv_undef)
807 if (!(stash = GvHV(gv)))
808 stash = GvHV(gv) = newHV();
810 if (!HvNAME_get(stash))
811 hv_name_set(stash, nambeg, namend - nambeg, 0);
819 return gv ? gv : (GV*)*hv_fetchs(PL_defstash, "main::", TRUE);
824 /* No stash in name, so see how we can default */
827 if (isIDFIRST_lazy(name)) {
830 /* name is always \0 terminated, and initial \0 wouldn't return
831 true from isIDFIRST_lazy, so we know that name[1] is defined */
838 if (strEQ(name, "INC") || strEQ(name, "ENV"))
842 if (strEQ(name, "SIG"))
846 if (strEQ(name, "STDIN") || strEQ(name, "STDOUT") ||
847 strEQ(name, "STDERR"))
851 if (strEQ(name, "ARGV") || strEQ(name, "ARGVOUT"))
858 else if (IN_PERL_COMPILETIME) {
860 if (add && (PL_hints & HINT_STRICT_VARS) &&
861 sv_type != SVt_PVCV &&
862 sv_type != SVt_PVGV &&
863 sv_type != SVt_PVFM &&
864 sv_type != SVt_PVIO &&
865 !(len == 1 && sv_type == SVt_PV &&
866 (*name == 'a' || *name == 'b')) )
868 gvp = (GV**)hv_fetch(stash,name,len,0);
870 *gvp == (GV*)&PL_sv_undef ||
871 SvTYPE(*gvp) != SVt_PVGV)
875 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
876 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
877 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
879 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
880 sv_type == SVt_PVAV ? '@' :
881 sv_type == SVt_PVHV ? '%' : '$',
884 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
890 stash = CopSTASH(PL_curcop);
896 /* By this point we should have a stash and a name */
900 SV * const err = Perl_mess(aTHX_
901 "Global symbol \"%s%s\" requires explicit package name",
902 (sv_type == SVt_PV ? "$"
903 : sv_type == SVt_PVAV ? "@"
904 : sv_type == SVt_PVHV ? "%"
906 if (USE_UTF8_IN_NAMES)
909 stash = GvHV(gv_fetchpvn_flags("<none>::", 8, GV_ADDMULTI, SVt_PVHV));
915 if (!SvREFCNT(stash)) /* symbol table under destruction */
918 gvp = (GV**)hv_fetch(stash,name,len,add);
919 if (!gvp || *gvp == (GV*)&PL_sv_undef)
922 if (SvTYPE(gv) == SVt_PVGV) {
925 gv_init_sv(gv, sv_type);
926 if (*name=='!' && sv_type == SVt_PVHV && len==1)
930 } else if (no_init) {
932 } else if (no_expand && SvROK(gv)) {
936 /* Adding a new symbol */
938 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
939 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
940 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
941 gv_init_sv(gv, sv_type);
943 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
944 : (PL_dowarn & G_WARN_ON ) ) )
947 /* set up magic where warranted */
951 /* Nothing else to do.
952 The compiler will probably turn the switch statement into a
953 branch table. Make sure we avoid even that small overhead for
954 the common case of lower case variable names. */
958 const char * const name2 = name + 1;
961 if (strEQ(name2, "RGV")) {
962 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
966 if (strnEQ(name2, "XPORT", 5))
970 if (strEQ(name2, "SA")) {
971 AV* const av = GvAVn(gv);
973 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, Nullch, 0);
974 /* NOTE: No support for tied ISA */
975 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
976 && AvFILLp(av) == -1)
979 av_push(av, newSVpvn(pname = "NDBM_File",9));
980 gv_stashpvn(pname, 9, TRUE);
981 av_push(av, newSVpvn(pname = "DB_File",7));
982 gv_stashpvn(pname, 7, TRUE);
983 av_push(av, newSVpvn(pname = "GDBM_File",9));
984 gv_stashpvn(pname, 9, TRUE);
985 av_push(av, newSVpvn(pname = "SDBM_File",9));
986 gv_stashpvn(pname, 9, TRUE);
987 av_push(av, newSVpvn(pname = "ODBM_File",9));
988 gv_stashpvn(pname, 9, TRUE);
993 if (strEQ(name2, "VERLOAD")) {
994 HV* const hv = GvHVn(gv);
996 hv_magic(hv, Nullgv, PERL_MAGIC_overload);
1000 if (strEQ(name2, "IG")) {
1004 Newxz(PL_psig_ptr, SIG_SIZE, SV*);
1005 Newxz(PL_psig_name, SIG_SIZE, SV*);
1006 Newxz(PL_psig_pend, SIG_SIZE, int);
1010 hv_magic(hv, Nullgv, PERL_MAGIC_sig);
1011 for (i = 1; i < SIG_SIZE; i++) {
1012 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1014 sv_setsv(*init, &PL_sv_undef);
1016 PL_psig_name[i] = 0;
1017 PL_psig_pend[i] = 0;
1022 if (strEQ(name2, "ERSION"))
1025 case '\003': /* $^CHILD_ERROR_NATIVE */
1026 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1029 case '\005': /* $^ENCODING */
1030 if (strEQ(name2, "NCODING"))
1033 case '\017': /* $^OPEN */
1034 if (strEQ(name2, "PEN"))
1037 case '\024': /* ${^TAINT} */
1038 if (strEQ(name2, "AINT"))
1041 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1042 if (strEQ(name2, "NICODE"))
1044 if (strEQ(name2, "TF8LOCALE"))
1047 case '\027': /* $^WARNING_BITS */
1048 if (strEQ(name2, "ARNING_BITS"))
1061 /* ensures variable is only digits */
1062 /* ${"1foo"} fails this test (and is thus writeable) */
1063 /* added by japhy, but borrowed from is_gv_magical */
1064 const char *end = name + len;
1065 while (--end > name) {
1066 if (!isDIGIT(*end)) return gv;
1073 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1074 be case '\0' in this switch statement (ie a default case) */
1080 sv_type == SVt_PVAV ||
1081 sv_type == SVt_PVHV ||
1082 sv_type == SVt_PVCV ||
1083 sv_type == SVt_PVFM ||
1086 PL_sawampersand = TRUE;
1090 sv_setpv(GvSVn(gv),PL_chopset);
1094 #ifdef COMPLEX_STATUS
1095 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1101 /* If %! has been used, automatically load Errno.pm.
1102 The require will itself set errno, so in order to
1103 preserve its value we have to set up the magic
1104 now (rather than going to magicalize)
1107 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1109 if (sv_type == SVt_PVHV)
1115 AV* const av = GvAVn(gv);
1116 sv_magic((SV*)av, Nullsv, PERL_MAGIC_regdata, Nullch, 0);
1122 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1123 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1124 "$%c is no longer supported", *name);
1127 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1132 AV* const av = GvAVn(gv);
1133 sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, Nullch, 0);
1137 case '\023': /* $^S */
1148 SvREADONLY_on(GvSVn(gv));
1163 case '\001': /* $^A */
1164 case '\003': /* $^C */
1165 case '\004': /* $^D */
1166 case '\005': /* $^E */
1167 case '\006': /* $^F */
1168 case '\010': /* $^H */
1169 case '\011': /* $^I, NOT \t in EBCDIC */
1170 case '\016': /* $^N */
1171 case '\017': /* $^O */
1172 case '\020': /* $^P */
1173 case '\024': /* $^T */
1174 case '\027': /* $^W */
1176 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1179 case '\014': /* $^L */
1180 sv_setpvn(GvSVn(gv),"\f",1);
1181 PL_formfeed = GvSVn(gv);
1184 sv_setpvn(GvSVn(gv),"\034",1);
1188 SV * const sv = GvSVn(gv);
1189 if (!sv_derived_from(PL_patchlevel, "version"))
1190 upg_version(PL_patchlevel);
1191 GvSV(gv) = vnumify(PL_patchlevel);
1192 SvREADONLY_on(GvSV(gv));
1196 case '\026': /* $^V */
1198 SV * const sv = GvSVn(gv);
1199 GvSV(gv) = new_version(PL_patchlevel);
1200 SvREADONLY_on(GvSV(gv));
1210 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1214 const HV * const hv = GvSTASH(gv);
1219 sv_setpv(sv, prefix ? prefix : "");
1221 name = HvNAME_get(hv);
1223 namelen = HvNAMELEN_get(hv);
1229 if (keepmain || strNE(name, "main")) {
1230 sv_catpvn(sv,name,namelen);
1233 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1237 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1239 const GV * const egv = GvEGV(gv);
1240 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1248 IO * const io = (IO*)newSV(0);
1250 sv_upgrade((SV *)io,SVt_PVIO);
1251 /* This used to read SvREFCNT(io) = 1;
1252 It's not clear why the reference count needed an explicit reset. NWC
1254 assert (SvREFCNT(io) == 1);
1256 /* Clear the stashcache because a new IO could overrule a package name */
1257 hv_clear(PL_stashcache);
1258 iogv = gv_fetchpvn_flags("FileHandle::", 12, 0, SVt_PVHV);
1259 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1260 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1261 iogv = gv_fetchpvn_flags("IO::Handle::", 12, TRUE, SVt_PVHV);
1262 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1267 Perl_gv_check(pTHX_ HV *stash)
1272 if (!HvARRAY(stash))
1274 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1276 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1279 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1280 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1282 if (hv != PL_defstash && hv != stash)
1283 gv_check(hv); /* nested package */
1285 else if (isALPHA(*HeKEY(entry))) {
1287 gv = (GV*)HeVAL(entry);
1288 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1291 /* performance hack: if filename is absolute and it's a standard
1292 * module, don't bother warning */
1293 #ifdef MACOS_TRADITIONAL
1294 # define LIB_COMPONENT ":lib:"
1296 # define LIB_COMPONENT "/lib/"
1299 && PERL_FILE_IS_ABSOLUTE(file)
1300 && (instr(file, LIB_COMPONENT) || instr(file, ".pm")))
1304 CopLINE_set(PL_curcop, GvLINE(gv));
1306 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1308 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1310 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1311 "Name \"%s::%s\" used only once: possible typo",
1312 HvNAME_get(stash), GvNAME(gv));
1319 Perl_newGVgen(pTHX_ const char *pack)
1322 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1326 /* hopefully this is only called on local symbol table entries */
1329 Perl_gp_ref(pTHX_ GP *gp)
1337 /* multi-named GPs cannot be used for method cache */
1338 SvREFCNT_dec(gp->gp_cv);
1343 /* Adding a new name to a subroutine invalidates method cache */
1344 PL_sub_generation++;
1351 Perl_gp_free(pTHX_ GV *gv)
1356 if (!gv || !(gp = GvGP(gv)))
1358 if (gp->gp_refcnt == 0) {
1359 if (ckWARN_d(WARN_INTERNAL))
1360 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1361 "Attempt to free unreferenced glob pointers"
1362 pTHX__FORMAT pTHX__VALUE);
1366 /* Deleting the name of a subroutine invalidates method cache */
1367 PL_sub_generation++;
1369 if (--gp->gp_refcnt > 0) {
1370 if (gp->gp_egv == gv)
1375 if (gp->gp_sv) SvREFCNT_dec(gp->gp_sv);
1376 if (gp->gp_av) SvREFCNT_dec(gp->gp_av);
1377 /* FIXME - another reference loop GV -> symtab -> GV ?
1378 Somehow gp->gp_hv can end up pointing at freed garbage. */
1379 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1380 const char *hvname = HvNAME_get(gp->gp_hv);
1381 if (PL_stashcache && hvname)
1382 hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv),
1384 SvREFCNT_dec(gp->gp_hv);
1386 if (gp->gp_io) SvREFCNT_dec(gp->gp_io);
1387 if (gp->gp_cv) SvREFCNT_dec(gp->gp_cv);
1388 if (gp->gp_form) SvREFCNT_dec(gp->gp_form);
1395 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1397 AMT * const amtp = (AMT*)mg->mg_ptr;
1398 PERL_UNUSED_ARG(sv);
1400 if (amtp && AMT_AMAGIC(amtp)) {
1402 for (i = 1; i < NofAMmeth; i++) {
1403 CV * const cv = amtp->table[i];
1405 SvREFCNT_dec((SV *) cv);
1406 amtp->table[i] = Nullcv;
1413 /* Updates and caches the CV's */
1416 Perl_Gv_AMupdate(pTHX_ HV *stash)
1419 MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1420 AMT * const amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
1423 if (mg && amtp->was_ok_am == PL_amagic_generation
1424 && amtp->was_ok_sub == PL_sub_generation)
1425 return (bool)AMT_OVERLOADED(amtp);
1426 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1428 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1431 amt.was_ok_am = PL_amagic_generation;
1432 amt.was_ok_sub = PL_sub_generation;
1433 amt.fallback = AMGfallNO;
1437 int filled = 0, have_ovl = 0;
1440 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1442 /* Try to find via inheritance. */
1443 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1444 SV * const sv = gv ? GvSV(gv) : NULL;
1448 lim = DESTROY_amg; /* Skip overloading entries. */
1449 #ifdef PERL_DONT_CREATE_GVSV
1451 /* Equivalent to !SvTRUE and !SvOK */
1454 else if (SvTRUE(sv))
1455 amt.fallback=AMGfallYES;
1457 amt.fallback=AMGfallNEVER;
1459 for (i = 1; i < lim; i++)
1460 amt.table[i] = Nullcv;
1461 for (; i < NofAMmeth; i++) {
1462 const char * const cooky = PL_AMG_names[i];
1463 /* Human-readable form, for debugging: */
1464 const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1465 const STRLEN l = strlen(cooky);
1467 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1468 cp, HvNAME_get(stash)) );
1469 /* don't fill the cache while looking up!
1470 Creation of inheritance stubs in intermediate packages may
1471 conflict with the logic of runtime method substitution.
1472 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1473 then we could have created stubs for "(+0" in A and C too.
1474 But if B overloads "bool", we may want to use it for
1475 numifying instead of C's "+0". */
1476 if (i >= DESTROY_amg)
1477 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1478 else /* Autoload taken care of below */
1479 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1481 if (gv && (cv = GvCV(gv))) {
1483 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1484 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1485 /* This is a hack to support autoloading..., while
1486 knowing *which* methods were declared as overloaded. */
1487 /* GvSV contains the name of the method. */
1489 SV *gvsv = GvSV(gv);
1491 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1492 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1493 GvSV(gv), cp, hvname) );
1494 if (!gvsv || !SvPOK(gvsv)
1495 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1498 /* Can be an import stub (created by "can"). */
1499 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1500 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1501 "in package \"%.256s\"",
1502 (GvCVGEN(gv) ? "Stub found while resolving"
1506 cv = GvCV(gv = ngv);
1508 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1509 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1510 GvNAME(CvGV(cv))) );
1512 if (i < DESTROY_amg)
1514 } else if (gv) { /* Autoloaded... */
1518 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1521 AMT_AMAGIC_on(&amt);
1523 AMT_OVERLOADED_on(&amt);
1524 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1525 (char*)&amt, sizeof(AMT));
1529 /* Here we have no table: */
1531 AMT_AMAGIC_off(&amt);
1532 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1533 (char*)&amt, sizeof(AMTS));
1539 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1545 if (!stash || !HvNAME_get(stash))
1547 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1551 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1553 amtp = (AMT*)mg->mg_ptr;
1554 if ( amtp->was_ok_am != PL_amagic_generation
1555 || amtp->was_ok_sub != PL_sub_generation )
1557 if (AMT_AMAGIC(amtp)) {
1558 CV * const ret = amtp->table[id];
1559 if (ret && isGV(ret)) { /* Autoloading stab */
1560 /* Passing it through may have resulted in a warning
1561 "Inherited AUTOLOAD for a non-method deprecated", since
1562 our caller is going through a function call, not a method call.
1563 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1564 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1577 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1582 CV **cvp=NULL, **ocvp=NULL;
1583 AMT *amtp=NULL, *oamtp=NULL;
1584 int off = 0, off1, lr = 0, notfound = 0;
1585 int postpr = 0, force_cpy = 0;
1586 int assign = AMGf_assign & flags;
1587 const int assignshift = assign ? 1 : 0;
1592 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1593 && (stash = SvSTASH(SvRV(left)))
1594 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1595 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1596 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1598 && ((cv = cvp[off=method+assignshift])
1599 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1605 cv = cvp[off=method])))) {
1606 lr = -1; /* Call method for left argument */
1608 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1611 /* look for substituted methods */
1612 /* In all the covered cases we should be called with assign==0. */
1616 if ((cv = cvp[off=add_ass_amg])
1617 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1618 right = &PL_sv_yes; lr = -1; assign = 1;
1623 if ((cv = cvp[off = subtr_ass_amg])
1624 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1625 right = &PL_sv_yes; lr = -1; assign = 1;
1629 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1632 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1635 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1638 (void)((cv = cvp[off=bool__amg])
1639 || (cv = cvp[off=numer_amg])
1640 || (cv = cvp[off=string_amg]));
1646 * SV* ref causes confusion with the interpreter variable of
1649 SV* const tmpRef=SvRV(left);
1650 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1652 * Just to be extra cautious. Maybe in some
1653 * additional cases sv_setsv is safe, too.
1655 SV* const newref = newSVsv(tmpRef);
1656 SvOBJECT_on(newref);
1657 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1663 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1664 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1665 SV* const nullsv=sv_2mortal(newSViv(0));
1667 SV* const lessp = amagic_call(left,nullsv,
1668 lt_amg,AMGf_noright);
1669 logic = SvTRUE(lessp);
1671 SV* const lessp = amagic_call(left,nullsv,
1672 ncmp_amg,AMGf_noright);
1673 logic = (SvNV(lessp) < 0);
1676 if (off==subtr_amg) {
1687 if ((cv = cvp[off=subtr_amg])) {
1689 left = sv_2mortal(newSViv(0));
1694 case iter_amg: /* XXXX Eventually should do to_gv. */
1696 return NULL; /* Delegate operation to standard mechanisms. */
1704 return left; /* Delegate operation to standard mechanisms. */
1709 if (!cv) goto not_found;
1710 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1711 && (stash = SvSTASH(SvRV(right)))
1712 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1713 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1714 ? (amtp = (AMT*)mg->mg_ptr)->table
1716 && (cv = cvp[off=method])) { /* Method for right
1719 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1720 && (cvp=ocvp) && (lr = -1))
1721 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1722 && !(flags & AMGf_unary)) {
1723 /* We look for substitution for
1724 * comparison operations and
1726 if (method==concat_amg || method==concat_ass_amg
1727 || method==repeat_amg || method==repeat_ass_amg) {
1728 return NULL; /* Delegate operation to string conversion */
1738 postpr = 1; off=ncmp_amg; break;
1745 postpr = 1; off=scmp_amg; break;
1747 if (off != -1) cv = cvp[off];
1752 not_found: /* No method found, either report or croak */
1760 return left; /* Delegate operation to standard mechanisms. */
1763 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1764 notfound = 1; lr = -1;
1765 } else if (cvp && (cv=cvp[nomethod_amg])) {
1766 notfound = 1; lr = 1;
1769 if (off==-1) off=method;
1770 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1771 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1772 AMG_id2name(method + assignshift),
1773 (flags & AMGf_unary ? " " : "\n\tleft "),
1775 "in overloaded package ":
1776 "has no overloaded magic",
1778 HvNAME_get(SvSTASH(SvRV(left))):
1781 ",\n\tright argument in overloaded package ":
1784 : ",\n\tright argument has no overloaded magic"),
1786 HvNAME_get(SvSTASH(SvRV(right))):
1788 if (amtp && amtp->fallback >= AMGfallYES) {
1789 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1791 Perl_croak(aTHX_ "%"SVf, msg);
1795 force_cpy = force_cpy || assign;
1800 DEBUG_o(Perl_deb(aTHX_
1801 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1803 method+assignshift==off? "" :
1805 method+assignshift==off? "" :
1806 AMG_id2name(method+assignshift),
1807 method+assignshift==off? "" : "\")",
1808 flags & AMGf_unary? "" :
1809 lr==1 ? " for right argument": " for left argument",
1810 flags & AMGf_unary? " for argument" : "",
1811 stash ? HvNAME_get(stash) : "null",
1812 fl? ",\n\tassignment variant used": "") );
1815 /* Since we use shallow copy during assignment, we need
1816 * to dublicate the contents, probably calling user-supplied
1817 * version of copy operator
1819 /* We need to copy in following cases:
1820 * a) Assignment form was called.
1821 * assignshift==1, assign==T, method + 1 == off
1822 * b) Increment or decrement, called directly.
1823 * assignshift==0, assign==0, method + 0 == off
1824 * c) Increment or decrement, translated to assignment add/subtr.
1825 * assignshift==0, assign==T,
1827 * d) Increment or decrement, translated to nomethod.
1828 * assignshift==0, assign==0,
1830 * e) Assignment form translated to nomethod.
1831 * assignshift==1, assign==T, method + 1 != off
1834 /* off is method, method+assignshift, or a result of opcode substitution.
1835 * In the latter case assignshift==0, so only notfound case is important.
1837 if (( (method + assignshift == off)
1838 && (assign || (method == inc_amg) || (method == dec_amg)))
1845 const bool oldcatch = CATCH_GET;
1848 Zero(&myop, 1, BINOP);
1849 myop.op_last = (OP *) &myop;
1850 myop.op_next = Nullop;
1851 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1853 PUSHSTACKi(PERLSI_OVERLOAD);
1856 PL_op = (OP *) &myop;
1857 if (PERLDB_SUB && PL_curstash != PL_debstash)
1858 PL_op->op_private |= OPpENTERSUB_DB;
1862 EXTEND(SP, notfound + 5);
1863 PUSHs(lr>0? right: left);
1864 PUSHs(lr>0? left: right);
1865 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1867 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1872 if ((PL_op = Perl_pp_entersub(aTHX)))
1880 CATCH_SET(oldcatch);
1887 ans=SvIV(res)<=0; break;
1890 ans=SvIV(res)<0; break;
1893 ans=SvIV(res)>=0; break;
1896 ans=SvIV(res)>0; break;
1899 ans=SvIV(res)==0; break;
1902 ans=SvIV(res)!=0; break;
1905 SvSetSV(left,res); return left;
1907 ans=!SvTRUE(res); break;
1912 } else if (method==copy_amg) {
1914 Perl_croak(aTHX_ "Copy method did not return a reference");
1916 return SvREFCNT_inc(SvRV(res));
1924 =for apidoc is_gv_magical_sv
1926 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
1932 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
1935 const char * const temp = SvPV_const(name, len);
1936 return is_gv_magical(temp, len, flags);
1940 =for apidoc is_gv_magical
1942 Returns C<TRUE> if given the name of a magical GV.
1944 Currently only useful internally when determining if a GV should be
1945 created even in rvalue contexts.
1947 C<flags> is not used at present but available for future extension to
1948 allow selecting particular classes of magical variable.
1950 Currently assumes that C<name> is NUL terminated (as well as len being valid).
1951 This assumption is met by all callers within the perl core, which all pass
1952 pointers returned by SvPV.
1957 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
1959 PERL_UNUSED_ARG(flags);
1962 const char * const name1 = name + 1;
1965 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
1969 if (len == 8 && strEQ(name1, "VERLOAD"))
1973 if (len == 3 && name[1] == 'I' && name[2] == 'G')
1976 /* Using ${^...} variables is likely to be sufficiently rare that
1977 it seems sensible to avoid the space hit of also checking the
1979 case '\017': /* ${^OPEN} */
1980 if (strEQ(name1, "PEN"))
1983 case '\024': /* ${^TAINT} */
1984 if (strEQ(name1, "AINT"))
1987 case '\025': /* ${^UNICODE} */
1988 if (strEQ(name1, "NICODE"))
1990 if (strEQ(name1, "TF8LOCALE"))
1993 case '\027': /* ${^WARNING_BITS} */
1994 if (strEQ(name1, "ARNING_BITS"))
2007 const char *end = name + len;
2008 while (--end > name) {
2016 /* Because we're already assuming that name is NUL terminated
2017 below, we can treat an empty name as "\0" */
2044 case '\001': /* $^A */
2045 case '\003': /* $^C */
2046 case '\004': /* $^D */
2047 case '\005': /* $^E */
2048 case '\006': /* $^F */
2049 case '\010': /* $^H */
2050 case '\011': /* $^I, NOT \t in EBCDIC */
2051 case '\014': /* $^L */
2052 case '\016': /* $^N */
2053 case '\017': /* $^O */
2054 case '\020': /* $^P */
2055 case '\023': /* $^S */
2056 case '\024': /* $^T */
2057 case '\026': /* $^V */
2058 case '\027': /* $^W */
2079 * c-indentation-style: bsd
2081 * indent-tabs-mode: t
2084 * ex: set ts=8 sts=4 sw=4 noet: