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 $foo, @foo, %foo.
27 GVs are usually found as values in stashes (symbol table hashes) where
28 Perl stores its global variables.
37 static const char S_autoload[] = "AUTOLOAD";
38 static const STRLEN S_autolen = sizeof(S_autoload)-1;
41 #ifdef PERL_DONT_CREATE_GVSV
43 Perl_gv_SVadd(pTHX_ GV *gv)
45 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
46 Perl_croak(aTHX_ "Bad symbol for scalar");
48 GvSV(gv) = NEWSV(72,0);
54 Perl_gv_AVadd(pTHX_ register GV *gv)
56 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
57 Perl_croak(aTHX_ "Bad symbol for array");
64 Perl_gv_HVadd(pTHX_ register GV *gv)
66 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
67 Perl_croak(aTHX_ "Bad symbol for hash");
74 Perl_gv_IOadd(pTHX_ register GV *gv)
77 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) {
80 * if it walks like a dirhandle, then let's assume that
81 * this is a dirhandle.
83 const char *fh = PL_op->op_type == OP_READDIR ||
84 PL_op->op_type == OP_TELLDIR ||
85 PL_op->op_type == OP_SEEKDIR ||
86 PL_op->op_type == OP_REWINDDIR ||
87 PL_op->op_type == OP_CLOSEDIR ?
88 "dirhandle" : "filehandle";
89 Perl_croak(aTHX_ "Bad symbol for %s", fh);
93 #ifdef GV_UNIQUE_CHECK
95 Perl_croak(aTHX_ "Bad symbol for filehandle (GV is unique)");
104 Perl_gv_fetchfile(pTHX_ const char *name)
115 tmplen = strlen(name) + 2;
116 if (tmplen < sizeof smallbuf)
119 Newx(tmpbuf, tmplen + 1, char);
120 /* This is where the debugger's %{"::_<$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
199 GvSV(gv) = NEWSV(72,0);
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
264 =for apidoc gv_fetchmeth
266 Returns the glob with the given C<name> and a defined subroutine or
267 C<NULL>. The glob lives in the given C<stash>, or in the stashes
268 accessible via @ISA and UNIVERSAL::.
270 The argument C<level> should be either 0 or -1. If C<level==0>, as a
271 side-effect creates a glob with the given C<name> in the given C<stash>
272 which in the case of success contains an alias for the subroutine, and sets
273 up caching info for this glob. Similarly for all the searched stashes.
275 This function grants C<"SUPER"> token as a postfix of the stash name. The
276 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
277 visible to Perl code. So when calling C<call_sv>, you should not use
278 the GV directly; instead, you should use the method's CV, which can be
279 obtained from the GV with the C<GvCV> macro.
285 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
295 /* UNIVERSAL methods should be callable without a stash */
297 level = -1; /* probably appropriate */
298 if(!(stash = gv_stashpvs("UNIVERSAL", FALSE)))
302 hvname = HvNAME_get(stash);
305 "Can't use anonymous symbol table for method lookup");
307 if ((level > 100) || (level < -100))
308 Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
311 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
313 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
318 if (SvTYPE(topgv) != SVt_PVGV)
319 gv_init(topgv, stash, name, len, TRUE);
320 if ((cv = GvCV(topgv))) {
321 /* If genuine method or valid cache entry, use it */
322 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
324 /* Stale cached entry: junk it */
326 GvCV(topgv) = cv = Nullcv;
329 else if (GvCVGEN(topgv) == PL_sub_generation)
330 return 0; /* cache indicates sub doesn't exist */
333 gvp = (GV**)hv_fetchs(stash, "ISA", FALSE);
334 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : NULL;
336 /* create and re-create @.*::SUPER::ISA on demand */
337 if (!av || !SvMAGIC(av)) {
338 STRLEN packlen = HvNAMELEN_get(stash);
340 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
344 basestash = gv_stashpvn(hvname, packlen, TRUE);
345 gvp = (GV**)hv_fetchs(basestash, "ISA", FALSE);
346 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
347 gvp = (GV**)hv_fetchs(stash, "ISA", TRUE);
348 if (!gvp || !(gv = *gvp))
349 Perl_croak(aTHX_ "Cannot create %s::ISA", hvname);
350 if (SvTYPE(gv) != SVt_PVGV)
351 gv_init(gv, stash, "ISA", 3, TRUE);
352 SvREFCNT_dec(GvAV(gv));
353 GvAV(gv) = (AV*)SvREFCNT_inc(av);
359 SV** svp = AvARRAY(av);
360 /* NOTE: No support for tied ISA */
361 I32 items = AvFILLp(av) + 1;
363 SV* const sv = *svp++;
364 HV* const basestash = gv_stashsv(sv, FALSE);
366 if (ckWARN(WARN_MISC))
367 Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
371 gv = gv_fetchmeth(basestash, name, len,
372 (level >= 0) ? level + 1 : level - 1);
378 /* if at top level, try UNIVERSAL */
380 if (level == 0 || level == -1) {
381 HV* const lastchance = gv_stashpvs("UNIVERSAL", FALSE);
384 if ((gv = gv_fetchmeth(lastchance, name, len,
385 (level >= 0) ? level + 1 : level - 1)))
389 * Cache method in topgv if:
390 * 1. topgv has no synonyms (else inheritance crosses wires)
391 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
394 GvREFCNT(topgv) == 1 &&
396 (CvROOT(cv) || CvXSUB(cv)))
398 if ((cv = GvCV(topgv)))
400 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
401 GvCVGEN(topgv) = PL_sub_generation;
405 else if (topgv && GvREFCNT(topgv) == 1) {
406 /* cache the fact that the method is not defined */
407 GvCVGEN(topgv) = PL_sub_generation;
416 =for apidoc gv_fetchmeth_autoload
418 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
419 Returns a glob for the subroutine.
421 For an autoloaded subroutine without a GV, will create a GV even
422 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
423 of the result may be zero.
429 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
431 GV *gv = gv_fetchmeth(stash, name, len, level);
438 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
439 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
441 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
444 if (!(CvROOT(cv) || CvXSUB(cv)))
446 /* Have an autoload */
447 if (level < 0) /* Cannot do without a stub */
448 gv_fetchmeth(stash, name, len, 0);
449 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
458 =for apidoc gv_fetchmethod_autoload
460 Returns the glob which contains the subroutine to call to invoke the method
461 on the C<stash>. In fact in the presence of autoloading this may be the
462 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
465 The third parameter of C<gv_fetchmethod_autoload> determines whether
466 AUTOLOAD lookup is performed if the given method is not present: non-zero
467 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
468 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
469 with a non-zero C<autoload> parameter.
471 These functions grant C<"SUPER"> token as a prefix of the method name. Note
472 that if you want to keep the returned glob for a long time, you need to
473 check for it being "AUTOLOAD", since at the later time the call may load a
474 different subroutine due to $AUTOLOAD changing its value. Use the glob
475 created via a side effect to do this.
477 These functions have the same side-effects and as C<gv_fetchmeth> with
478 C<level==0>. C<name> should be writable if contains C<':'> or C<'
479 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
480 C<call_sv> apply equally to these functions.
486 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
489 register const char *nend;
490 const char *nsplit = NULL;
494 if (stash && SvTYPE(stash) < SVt_PVHV)
497 for (nend = name; *nend; nend++) {
500 else if (*nend == ':' && *(nend + 1) == ':')
504 const char * const origname = name;
508 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
509 /* ->SUPER::method should really be looked up in original stash */
510 SV *tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
511 CopSTASHPV(PL_curcop)));
512 /* __PACKAGE__::SUPER stash should be autovivified */
513 stash = gv_stashpvn(SvPVX_const(tmpstr), SvCUR(tmpstr), TRUE);
514 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
515 origname, HvNAME_get(stash), name) );
518 /* don't autovifify if ->NoSuchStash::method */
519 stash = gv_stashpvn(origname, nsplit - origname, FALSE);
521 /* however, explicit calls to Pkg::SUPER::method may
522 happen, and may require autovivification to work */
523 if (!stash && (nsplit - origname) >= 7 &&
524 strnEQ(nsplit - 7, "::SUPER", 7) &&
525 gv_stashpvn(origname, nsplit - origname - 7, FALSE))
526 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
531 gv = gv_fetchmeth(stash, name, nend - name, 0);
533 if (strEQ(name,"import") || strEQ(name,"unimport"))
534 gv = (GV*)&PL_sv_yes;
536 gv = gv_autoload4(ostash, name, nend - name, TRUE);
539 CV* const cv = GvCV(gv);
540 if (!CvROOT(cv) && !CvXSUB(cv)) {
548 if (GvCV(stubgv) != cv) /* orphaned import */
551 autogv = gv_autoload4(GvSTASH(stubgv),
552 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
562 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
570 const char *packname = "";
573 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
576 if (SvTYPE(stash) < SVt_PVHV) {
577 packname = SvPV_const((SV*)stash, packname_len);
581 packname = HvNAME_get(stash);
582 packname_len = HvNAMELEN_get(stash);
585 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
589 if (!(CvROOT(cv) || CvXSUB(cv)))
593 * Inheriting AUTOLOAD for non-methods works ... for now.
595 if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
596 && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)
598 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
599 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
600 packname, (int)len, name);
603 /* rather than lookup/init $AUTOLOAD here
604 * only to have the XSUB do another lookup for $AUTOLOAD
605 * and split that value on the last '::',
606 * pass along the same data via some unused fields in the CV
609 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
615 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
616 * The subroutine's original name may not be "AUTOLOAD", so we don't
617 * use that, but for lack of anything better we will use the sub's
618 * original package to look up $AUTOLOAD.
620 varstash = GvSTASH(CvGV(cv));
621 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
625 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
626 #ifdef PERL_DONT_CREATE_GVSV
627 GvSV(vargv) = NEWSV(72,0);
631 varsv = GvSVn(vargv);
632 sv_setpvn(varsv, packname, packname_len);
633 sv_catpvs(varsv, "::");
634 sv_catpvn(varsv, name, len);
635 SvTAINTED_off(varsv);
639 /* The "gv" parameter should be the glob known to Perl code as *!
640 * The scalar must already have been magicalized.
643 S_require_errno(pTHX_ GV *gv)
646 HV* stash = gv_stashpvs("Errno", FALSE);
648 if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
652 save_scalar(gv); /* keep the value of $! */
653 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
654 newSVpvs("Errno"), Nullsv);
657 stash = gv_stashpvs("Errno", FALSE);
658 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
659 Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available");
664 =for apidoc gv_stashpv
666 Returns a pointer to the stash for a specified package. C<name> should
667 be a valid UTF-8 string and must be null-terminated. If C<create> is set
668 then the package will be created if it does not already exist. If C<create>
669 is not set and the package does not exist then NULL is returned.
675 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
677 return gv_stashpvn(name, strlen(name), create);
681 =for apidoc gv_stashpvn
683 Returns a pointer to the stash for a specified package. C<name> should
684 be a valid UTF-8 string. The C<namelen> parameter indicates the length of
685 the C<name>, in bytes. If C<create> is set then the package will be
686 created if it does not already exist. If C<create> is not set and the
687 package does not exist then NULL is returned.
693 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
700 if (namelen + 3 < sizeof smallbuf)
703 Newx(tmpbuf, namelen + 3, char);
704 Copy(name,tmpbuf,namelen,char);
705 tmpbuf[namelen++] = ':';
706 tmpbuf[namelen++] = ':';
707 tmpbuf[namelen] = '\0';
708 tmpgv = gv_fetchpvn_flags(tmpbuf, namelen, create, SVt_PVHV);
709 if (tmpbuf != smallbuf)
714 GvHV(tmpgv) = newHV();
716 if (!HvNAME_get(stash))
717 hv_name_set(stash, name, namelen, 0);
722 =for apidoc gv_stashsv
724 Returns a pointer to the stash for a specified package, which must be a
725 valid UTF-8 string. See C<gv_stashpv>.
731 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
734 const char * const ptr = SvPV_const(sv,len);
735 return gv_stashpvn(ptr, len, create);
740 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
741 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
745 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
747 const char * const nambeg = SvPV_const(name, len);
748 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
752 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
756 register const char *name = nambeg;
757 register GV *gv = NULL;
760 register const char *namend;
762 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
763 const I32 no_expand = flags & GV_NOEXPAND;
764 const I32 add = flags & ~SVf_UTF8 & ~GV_NOADD_NOINIT & ~GV_NOEXPAND;
766 PERL_UNUSED_ARG(full_len);
768 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
771 for (namend = name; *namend; namend++) {
772 if ((*namend == ':' && namend[1] == ':')
773 || (*namend == '\'' && namend[1]))
777 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
785 if (len + 3 < sizeof (smallbuf))
788 Newx(tmpbuf, len+3, char);
789 Copy(name, tmpbuf, len, char);
793 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
794 gv = gvp ? *gvp : Nullgv;
795 if (gv && gv != (GV*)&PL_sv_undef) {
796 if (SvTYPE(gv) != SVt_PVGV)
797 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
801 if (tmpbuf != smallbuf)
803 if (!gv || gv == (GV*)&PL_sv_undef)
806 if (!(stash = GvHV(gv)))
807 stash = GvHV(gv) = newHV();
809 if (!HvNAME_get(stash))
810 hv_name_set(stash, nambeg, namend - nambeg, 0);
818 return gv ? gv : (GV*)*hv_fetchs(PL_defstash, "main::", TRUE);
823 /* No stash in name, so see how we can default */
826 if (isIDFIRST_lazy(name)) {
829 /* name is always \0 terminated, and initial \0 wouldn't return
830 true from isIDFIRST_lazy, so we know that name[1] is defined */
837 if (strEQ(name, "INC") || strEQ(name, "ENV"))
841 if (strEQ(name, "SIG"))
845 if (strEQ(name, "STDIN") || strEQ(name, "STDOUT") ||
846 strEQ(name, "STDERR"))
850 if (strEQ(name, "ARGV") || strEQ(name, "ARGVOUT"))
857 else if (IN_PERL_COMPILETIME) {
859 if (add && (PL_hints & HINT_STRICT_VARS) &&
860 sv_type != SVt_PVCV &&
861 sv_type != SVt_PVGV &&
862 sv_type != SVt_PVFM &&
863 sv_type != SVt_PVIO &&
864 !(len == 1 && sv_type == SVt_PV &&
865 (*name == 'a' || *name == 'b')) )
867 gvp = (GV**)hv_fetch(stash,name,len,0);
869 *gvp == (GV*)&PL_sv_undef ||
870 SvTYPE(*gvp) != SVt_PVGV)
874 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
875 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
876 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
878 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
879 sv_type == SVt_PVAV ? '@' :
880 sv_type == SVt_PVHV ? '%' : '$',
883 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
889 stash = CopSTASH(PL_curcop);
895 /* By this point we should have a stash and a name */
899 SV * const err = Perl_mess(aTHX_
900 "Global symbol \"%s%s\" requires explicit package name",
901 (sv_type == SVt_PV ? "$"
902 : sv_type == SVt_PVAV ? "@"
903 : sv_type == SVt_PVHV ? "%"
905 if (USE_UTF8_IN_NAMES)
908 stash = GvHV(gv_fetchpvn_flags("<none>::", 8, GV_ADDMULTI, SVt_PVHV));
914 if (!SvREFCNT(stash)) /* symbol table under destruction */
917 gvp = (GV**)hv_fetch(stash,name,len,add);
918 if (!gvp || *gvp == (GV*)&PL_sv_undef)
921 if (SvTYPE(gv) == SVt_PVGV) {
924 gv_init_sv(gv, sv_type);
925 if (*name=='!' && sv_type == SVt_PVHV && len==1)
929 } else if (no_init) {
931 } else if (no_expand && SvROK(gv)) {
935 /* Adding a new symbol */
937 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
938 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
939 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
940 gv_init_sv(gv, sv_type);
942 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
943 : (PL_dowarn & G_WARN_ON ) ) )
946 /* set up magic where warranted */
950 /* Nothing else to do.
951 The compiler will probably turn the switch statement into a
952 branch table. Make sure we avoid even that small overhead for
953 the common case of lower case variable names. */
957 const char * const name2 = name + 1;
960 if (strEQ(name2, "RGV")) {
961 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
965 if (strnEQ(name2, "XPORT", 5))
969 if (strEQ(name2, "SA")) {
970 AV* const av = GvAVn(gv);
972 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, Nullch, 0);
973 /* NOTE: No support for tied ISA */
974 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
975 && AvFILLp(av) == -1)
978 av_push(av, newSVpvn(pname = "NDBM_File",9));
979 gv_stashpvn(pname, 9, TRUE);
980 av_push(av, newSVpvn(pname = "DB_File",7));
981 gv_stashpvn(pname, 7, TRUE);
982 av_push(av, newSVpvn(pname = "GDBM_File",9));
983 gv_stashpvn(pname, 9, TRUE);
984 av_push(av, newSVpvn(pname = "SDBM_File",9));
985 gv_stashpvn(pname, 9, TRUE);
986 av_push(av, newSVpvn(pname = "ODBM_File",9));
987 gv_stashpvn(pname, 9, TRUE);
992 if (strEQ(name2, "VERLOAD")) {
993 HV* const hv = GvHVn(gv);
995 hv_magic(hv, Nullgv, PERL_MAGIC_overload);
999 if (strEQ(name2, "IG")) {
1003 Newxz(PL_psig_ptr, SIG_SIZE, SV*);
1004 Newxz(PL_psig_name, SIG_SIZE, SV*);
1005 Newxz(PL_psig_pend, SIG_SIZE, int);
1009 hv_magic(hv, Nullgv, PERL_MAGIC_sig);
1010 for (i = 1; i < SIG_SIZE; i++) {
1011 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1013 sv_setsv(*init, &PL_sv_undef);
1015 PL_psig_name[i] = 0;
1016 PL_psig_pend[i] = 0;
1021 if (strEQ(name2, "ERSION"))
1024 case '\003': /* $^CHILD_ERROR_NATIVE */
1025 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1028 case '\005': /* $^ENCODING */
1029 if (strEQ(name2, "NCODING"))
1032 case '\017': /* $^OPEN */
1033 if (strEQ(name2, "PEN"))
1036 case '\024': /* ${^TAINT} */
1037 if (strEQ(name2, "AINT"))
1040 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1041 if (strEQ(name2, "NICODE"))
1043 if (strEQ(name2, "TF8LOCALE"))
1046 case '\027': /* $^WARNING_BITS */
1047 if (strEQ(name2, "ARNING_BITS"))
1060 /* ensures variable is only digits */
1061 /* ${"1foo"} fails this test (and is thus writeable) */
1062 /* added by japhy, but borrowed from is_gv_magical */
1063 const char *end = name + len;
1064 while (--end > name) {
1065 if (!isDIGIT(*end)) return gv;
1072 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1073 be case '\0' in this switch statement (ie a default case) */
1079 sv_type == SVt_PVAV ||
1080 sv_type == SVt_PVHV ||
1081 sv_type == SVt_PVCV ||
1082 sv_type == SVt_PVFM ||
1085 PL_sawampersand = TRUE;
1089 sv_setpv(GvSVn(gv),PL_chopset);
1093 #ifdef COMPLEX_STATUS
1094 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1100 /* If %! has been used, automatically load Errno.pm.
1101 The require will itself set errno, so in order to
1102 preserve its value we have to set up the magic
1103 now (rather than going to magicalize)
1106 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1108 if (sv_type == SVt_PVHV)
1114 AV* const av = GvAVn(gv);
1115 sv_magic((SV*)av, Nullsv, PERL_MAGIC_regdata, Nullch, 0);
1121 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1122 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1123 "$%c is no longer supported", *name);
1126 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1131 AV* const av = GvAVn(gv);
1132 sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, Nullch, 0);
1136 case '\023': /* $^S */
1147 SvREADONLY_on(GvSVn(gv));
1162 case '\001': /* $^A */
1163 case '\003': /* $^C */
1164 case '\004': /* $^D */
1165 case '\005': /* $^E */
1166 case '\006': /* $^F */
1167 case '\010': /* $^H */
1168 case '\011': /* $^I, NOT \t in EBCDIC */
1169 case '\016': /* $^N */
1170 case '\017': /* $^O */
1171 case '\020': /* $^P */
1172 case '\024': /* $^T */
1173 case '\027': /* $^W */
1175 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1178 case '\014': /* $^L */
1179 sv_setpvn(GvSVn(gv),"\f",1);
1180 PL_formfeed = GvSVn(gv);
1183 sv_setpvn(GvSVn(gv),"\034",1);
1187 SV * const sv = GvSVn(gv);
1188 if (!sv_derived_from(PL_patchlevel, "version"))
1189 upg_version(PL_patchlevel);
1190 GvSV(gv) = vnumify(PL_patchlevel);
1191 SvREADONLY_on(GvSV(gv));
1195 case '\026': /* $^V */
1197 SV * const sv = GvSVn(gv);
1198 GvSV(gv) = new_version(PL_patchlevel);
1199 SvREADONLY_on(GvSV(gv));
1209 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1213 const HV * const hv = GvSTASH(gv);
1218 sv_setpv(sv, prefix ? prefix : "");
1220 name = HvNAME_get(hv);
1222 namelen = HvNAMELEN_get(hv);
1228 if (keepmain || strNE(name, "main")) {
1229 sv_catpvn(sv,name,namelen);
1232 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1236 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1238 const GV * const egv = GvEGV(gv);
1239 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1247 IO * const io = (IO*)NEWSV(0,0);
1249 sv_upgrade((SV *)io,SVt_PVIO);
1250 /* This used to read SvREFCNT(io) = 1;
1251 It's not clear why the reference count needed an explicit reset. NWC
1253 assert (SvREFCNT(io) == 1);
1255 /* Clear the stashcache because a new IO could overrule a package name */
1256 hv_clear(PL_stashcache);
1257 iogv = gv_fetchpvn_flags("FileHandle::", 12, 0, SVt_PVHV);
1258 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1259 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1260 iogv = gv_fetchpvn_flags("IO::Handle::", 12, TRUE, SVt_PVHV);
1261 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1266 Perl_gv_check(pTHX_ HV *stash)
1271 if (!HvARRAY(stash))
1273 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1275 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1278 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1279 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1281 if (hv != PL_defstash && hv != stash)
1282 gv_check(hv); /* nested package */
1284 else if (isALPHA(*HeKEY(entry))) {
1286 gv = (GV*)HeVAL(entry);
1287 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1290 /* performance hack: if filename is absolute and it's a standard
1291 * module, don't bother warning */
1292 #ifdef MACOS_TRADITIONAL
1293 # define LIB_COMPONENT ":lib:"
1295 # define LIB_COMPONENT "/lib/"
1298 && PERL_FILE_IS_ABSOLUTE(file)
1299 && (instr(file, LIB_COMPONENT) || instr(file, ".pm")))
1303 CopLINE_set(PL_curcop, GvLINE(gv));
1305 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1307 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1309 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1310 "Name \"%s::%s\" used only once: possible typo",
1311 HvNAME_get(stash), GvNAME(gv));
1318 Perl_newGVgen(pTHX_ const char *pack)
1321 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1325 /* hopefully this is only called on local symbol table entries */
1328 Perl_gp_ref(pTHX_ GP *gp)
1336 /* multi-named GPs cannot be used for method cache */
1337 SvREFCNT_dec(gp->gp_cv);
1342 /* Adding a new name to a subroutine invalidates method cache */
1343 PL_sub_generation++;
1350 Perl_gp_free(pTHX_ GV *gv)
1355 if (!gv || !(gp = GvGP(gv)))
1357 if (gp->gp_refcnt == 0) {
1358 if (ckWARN_d(WARN_INTERNAL))
1359 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1360 "Attempt to free unreferenced glob pointers"
1361 pTHX__FORMAT pTHX__VALUE);
1365 /* Deleting the name of a subroutine invalidates method cache */
1366 PL_sub_generation++;
1368 if (--gp->gp_refcnt > 0) {
1369 if (gp->gp_egv == gv)
1374 if (gp->gp_sv) SvREFCNT_dec(gp->gp_sv);
1375 if (gp->gp_av) SvREFCNT_dec(gp->gp_av);
1376 /* FIXME - another reference loop GV -> symtab -> GV ?
1377 Somehow gp->gp_hv can end up pointing at freed garbage. */
1378 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1379 const char *hvname = HvNAME_get(gp->gp_hv);
1380 if (PL_stashcache && hvname)
1381 hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv),
1383 SvREFCNT_dec(gp->gp_hv);
1385 if (gp->gp_io) SvREFCNT_dec(gp->gp_io);
1386 if (gp->gp_cv) SvREFCNT_dec(gp->gp_cv);
1387 if (gp->gp_form) SvREFCNT_dec(gp->gp_form);
1394 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1396 AMT * const amtp = (AMT*)mg->mg_ptr;
1397 PERL_UNUSED_ARG(sv);
1399 if (amtp && AMT_AMAGIC(amtp)) {
1401 for (i = 1; i < NofAMmeth; i++) {
1402 CV * const cv = amtp->table[i];
1404 SvREFCNT_dec((SV *) cv);
1405 amtp->table[i] = Nullcv;
1412 /* Updates and caches the CV's */
1415 Perl_Gv_AMupdate(pTHX_ HV *stash)
1418 MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1419 AMT * const amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
1422 if (mg && amtp->was_ok_am == PL_amagic_generation
1423 && amtp->was_ok_sub == PL_sub_generation)
1424 return (bool)AMT_OVERLOADED(amtp);
1425 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1427 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1430 amt.was_ok_am = PL_amagic_generation;
1431 amt.was_ok_sub = PL_sub_generation;
1432 amt.fallback = AMGfallNO;
1436 int filled = 0, have_ovl = 0;
1439 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1441 /* Try to find via inheritance. */
1442 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1443 SV * const sv = gv ? GvSV(gv) : NULL;
1447 lim = DESTROY_amg; /* Skip overloading entries. */
1448 #ifdef PERL_DONT_CREATE_GVSV
1450 /* Equivalent to !SvTRUE and !SvOK */
1453 else if (SvTRUE(sv))
1454 amt.fallback=AMGfallYES;
1456 amt.fallback=AMGfallNEVER;
1458 for (i = 1; i < lim; i++)
1459 amt.table[i] = Nullcv;
1460 for (; i < NofAMmeth; i++) {
1461 const char * const cooky = PL_AMG_names[i];
1462 /* Human-readable form, for debugging: */
1463 const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1464 const STRLEN l = strlen(cooky);
1466 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1467 cp, HvNAME_get(stash)) );
1468 /* don't fill the cache while looking up!
1469 Creation of inheritance stubs in intermediate packages may
1470 conflict with the logic of runtime method substitution.
1471 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1472 then we could have created stubs for "(+0" in A and C too.
1473 But if B overloads "bool", we may want to use it for
1474 numifying instead of C's "+0". */
1475 if (i >= DESTROY_amg)
1476 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1477 else /* Autoload taken care of below */
1478 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1480 if (gv && (cv = GvCV(gv))) {
1482 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1483 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1484 /* This is a hack to support autoloading..., while
1485 knowing *which* methods were declared as overloaded. */
1486 /* GvSV contains the name of the method. */
1488 SV *gvsv = GvSV(gv);
1490 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1491 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1492 GvSV(gv), cp, hvname) );
1493 if (!gvsv || !SvPOK(gvsv)
1494 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1497 /* Can be an import stub (created by "can"). */
1498 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1499 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1500 "in package \"%.256s\"",
1501 (GvCVGEN(gv) ? "Stub found while resolving"
1505 cv = GvCV(gv = ngv);
1507 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1508 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1509 GvNAME(CvGV(cv))) );
1511 if (i < DESTROY_amg)
1513 } else if (gv) { /* Autoloaded... */
1517 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1520 AMT_AMAGIC_on(&amt);
1522 AMT_OVERLOADED_on(&amt);
1523 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1524 (char*)&amt, sizeof(AMT));
1528 /* Here we have no table: */
1530 AMT_AMAGIC_off(&amt);
1531 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1532 (char*)&amt, sizeof(AMTS));
1538 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1544 if (!stash || !HvNAME_get(stash))
1546 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1550 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1552 amtp = (AMT*)mg->mg_ptr;
1553 if ( amtp->was_ok_am != PL_amagic_generation
1554 || amtp->was_ok_sub != PL_sub_generation )
1556 if (AMT_AMAGIC(amtp)) {
1557 CV * const ret = amtp->table[id];
1558 if (ret && isGV(ret)) { /* Autoloading stab */
1559 /* Passing it through may have resulted in a warning
1560 "Inherited AUTOLOAD for a non-method deprecated", since
1561 our caller is going through a function call, not a method call.
1562 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1563 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1576 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1581 CV **cvp=NULL, **ocvp=NULL;
1582 AMT *amtp=NULL, *oamtp=NULL;
1583 int off = 0, off1, lr = 0, notfound = 0;
1584 int postpr = 0, force_cpy = 0;
1585 int assign = AMGf_assign & flags;
1586 const int assignshift = assign ? 1 : 0;
1591 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1592 && (stash = SvSTASH(SvRV(left)))
1593 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1594 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1595 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1597 && ((cv = cvp[off=method+assignshift])
1598 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1604 cv = cvp[off=method])))) {
1605 lr = -1; /* Call method for left argument */
1607 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1610 /* look for substituted methods */
1611 /* In all the covered cases we should be called with assign==0. */
1615 if ((cv = cvp[off=add_ass_amg])
1616 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1617 right = &PL_sv_yes; lr = -1; assign = 1;
1622 if ((cv = cvp[off = subtr_ass_amg])
1623 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1624 right = &PL_sv_yes; lr = -1; assign = 1;
1628 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1631 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1634 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1637 (void)((cv = cvp[off=bool__amg])
1638 || (cv = cvp[off=numer_amg])
1639 || (cv = cvp[off=string_amg]));
1645 * SV* ref causes confusion with the interpreter variable of
1648 SV* const tmpRef=SvRV(left);
1649 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1651 * Just to be extra cautious. Maybe in some
1652 * additional cases sv_setsv is safe, too.
1654 SV* const newref = newSVsv(tmpRef);
1655 SvOBJECT_on(newref);
1656 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1662 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1663 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1664 SV* const nullsv=sv_2mortal(newSViv(0));
1666 SV* const lessp = amagic_call(left,nullsv,
1667 lt_amg,AMGf_noright);
1668 logic = SvTRUE(lessp);
1670 SV* const lessp = amagic_call(left,nullsv,
1671 ncmp_amg,AMGf_noright);
1672 logic = (SvNV(lessp) < 0);
1675 if (off==subtr_amg) {
1686 if ((cv = cvp[off=subtr_amg])) {
1688 left = sv_2mortal(newSViv(0));
1693 case iter_amg: /* XXXX Eventually should do to_gv. */
1695 return NULL; /* Delegate operation to standard mechanisms. */
1703 return left; /* Delegate operation to standard mechanisms. */
1708 if (!cv) goto not_found;
1709 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1710 && (stash = SvSTASH(SvRV(right)))
1711 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1712 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1713 ? (amtp = (AMT*)mg->mg_ptr)->table
1715 && (cv = cvp[off=method])) { /* Method for right
1718 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1719 && (cvp=ocvp) && (lr = -1))
1720 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1721 && !(flags & AMGf_unary)) {
1722 /* We look for substitution for
1723 * comparison operations and
1725 if (method==concat_amg || method==concat_ass_amg
1726 || method==repeat_amg || method==repeat_ass_amg) {
1727 return NULL; /* Delegate operation to string conversion */
1737 postpr = 1; off=ncmp_amg; break;
1744 postpr = 1; off=scmp_amg; break;
1746 if (off != -1) cv = cvp[off];
1751 not_found: /* No method found, either report or croak */
1759 return left; /* Delegate operation to standard mechanisms. */
1762 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1763 notfound = 1; lr = -1;
1764 } else if (cvp && (cv=cvp[nomethod_amg])) {
1765 notfound = 1; lr = 1;
1768 if (off==-1) off=method;
1769 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1770 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1771 AMG_id2name(method + assignshift),
1772 (flags & AMGf_unary ? " " : "\n\tleft "),
1774 "in overloaded package ":
1775 "has no overloaded magic",
1777 HvNAME_get(SvSTASH(SvRV(left))):
1780 ",\n\tright argument in overloaded package ":
1783 : ",\n\tright argument has no overloaded magic"),
1785 HvNAME_get(SvSTASH(SvRV(right))):
1787 if (amtp && amtp->fallback >= AMGfallYES) {
1788 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1790 Perl_croak(aTHX_ "%"SVf, msg);
1794 force_cpy = force_cpy || assign;
1799 DEBUG_o(Perl_deb(aTHX_
1800 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1802 method+assignshift==off? "" :
1804 method+assignshift==off? "" :
1805 AMG_id2name(method+assignshift),
1806 method+assignshift==off? "" : "\")",
1807 flags & AMGf_unary? "" :
1808 lr==1 ? " for right argument": " for left argument",
1809 flags & AMGf_unary? " for argument" : "",
1810 stash ? HvNAME_get(stash) : "null",
1811 fl? ",\n\tassignment variant used": "") );
1814 /* Since we use shallow copy during assignment, we need
1815 * to dublicate the contents, probably calling user-supplied
1816 * version of copy operator
1818 /* We need to copy in following cases:
1819 * a) Assignment form was called.
1820 * assignshift==1, assign==T, method + 1 == off
1821 * b) Increment or decrement, called directly.
1822 * assignshift==0, assign==0, method + 0 == off
1823 * c) Increment or decrement, translated to assignment add/subtr.
1824 * assignshift==0, assign==T,
1826 * d) Increment or decrement, translated to nomethod.
1827 * assignshift==0, assign==0,
1829 * e) Assignment form translated to nomethod.
1830 * assignshift==1, assign==T, method + 1 != off
1833 /* off is method, method+assignshift, or a result of opcode substitution.
1834 * In the latter case assignshift==0, so only notfound case is important.
1836 if (( (method + assignshift == off)
1837 && (assign || (method == inc_amg) || (method == dec_amg)))
1844 const bool oldcatch = CATCH_GET;
1847 Zero(&myop, 1, BINOP);
1848 myop.op_last = (OP *) &myop;
1849 myop.op_next = Nullop;
1850 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1852 PUSHSTACKi(PERLSI_OVERLOAD);
1855 PL_op = (OP *) &myop;
1856 if (PERLDB_SUB && PL_curstash != PL_debstash)
1857 PL_op->op_private |= OPpENTERSUB_DB;
1861 EXTEND(SP, notfound + 5);
1862 PUSHs(lr>0? right: left);
1863 PUSHs(lr>0? left: right);
1864 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1866 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1871 if ((PL_op = Perl_pp_entersub(aTHX)))
1879 CATCH_SET(oldcatch);
1886 ans=SvIV(res)<=0; break;
1889 ans=SvIV(res)<0; break;
1892 ans=SvIV(res)>=0; break;
1895 ans=SvIV(res)>0; break;
1898 ans=SvIV(res)==0; break;
1901 ans=SvIV(res)!=0; break;
1904 SvSetSV(left,res); return left;
1906 ans=!SvTRUE(res); break;
1911 } else if (method==copy_amg) {
1913 Perl_croak(aTHX_ "Copy method did not return a reference");
1915 return SvREFCNT_inc(SvRV(res));
1923 =for apidoc is_gv_magical_sv
1925 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
1931 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
1934 const char * const temp = SvPV_const(name, len);
1935 return is_gv_magical(temp, len, flags);
1939 =for apidoc is_gv_magical
1941 Returns C<TRUE> if given the name of a magical GV.
1943 Currently only useful internally when determining if a GV should be
1944 created even in rvalue contexts.
1946 C<flags> is not used at present but available for future extension to
1947 allow selecting particular classes of magical variable.
1949 Currently assumes that C<name> is NUL terminated (as well as len being valid).
1950 This assumption is met by all callers within the perl core, which all pass
1951 pointers returned by SvPV.
1956 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
1958 PERL_UNUSED_ARG(flags);
1961 const char * const name1 = name + 1;
1964 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
1968 if (len == 8 && strEQ(name1, "VERLOAD"))
1972 if (len == 3 && name[1] == 'I' && name[2] == 'G')
1975 /* Using ${^...} variables is likely to be sufficiently rare that
1976 it seems sensible to avoid the space hit of also checking the
1978 case '\017': /* ${^OPEN} */
1979 if (strEQ(name1, "PEN"))
1982 case '\024': /* ${^TAINT} */
1983 if (strEQ(name1, "AINT"))
1986 case '\025': /* ${^UNICODE} */
1987 if (strEQ(name1, "NICODE"))
1989 if (strEQ(name1, "TF8LOCALE"))
1992 case '\027': /* ${^WARNING_BITS} */
1993 if (strEQ(name1, "ARNING_BITS"))
2006 const char *end = name + len;
2007 while (--end > name) {
2015 /* Because we're already assuming that name is NUL terminated
2016 below, we can treat an empty name as "\0" */
2043 case '\001': /* $^A */
2044 case '\003': /* $^C */
2045 case '\004': /* $^D */
2046 case '\005': /* $^E */
2047 case '\006': /* $^F */
2048 case '\010': /* $^H */
2049 case '\011': /* $^I, NOT \t in EBCDIC */
2050 case '\014': /* $^L */
2051 case '\016': /* $^N */
2052 case '\017': /* $^O */
2053 case '\020': /* $^P */
2054 case '\023': /* $^S */
2055 case '\024': /* $^T */
2056 case '\026': /* $^V */
2057 case '\027': /* $^W */
2078 * c-indentation-style: bsd
2080 * indent-tabs-mode: t
2083 * ex: set ts=8 sts=4 sw=4 noet: