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 $foo, @foo, %foo.
27 GVs are usually found as values in stashes (symbol table hashes) where
28 Perl stores its global variables.
37 const char S_autoload[] = "AUTOLOAD";
38 const STRLEN S_autolen = sizeof(S_autoload)-1;
41 #ifdef PERL_DONT_CREATE_GVSV
43 Perl_gv_SVadd(pTHX_ GV *gv)
45 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
46 Perl_croak(aTHX_ "Bad symbol for scalar");
54 Perl_gv_AVadd(pTHX_ register GV *gv)
56 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
57 Perl_croak(aTHX_ "Bad symbol for array");
64 Perl_gv_HVadd(pTHX_ register GV *gv)
66 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
67 Perl_croak(aTHX_ "Bad symbol for hash");
74 Perl_gv_IOadd(pTHX_ register GV *gv)
76 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) {
79 * if it walks like a dirhandle, then let's assume that
80 * this is a dirhandle.
82 const char * const fh =
83 PL_op->op_type == OP_READDIR ||
84 PL_op->op_type == OP_TELLDIR ||
85 PL_op->op_type == OP_SEEKDIR ||
86 PL_op->op_type == OP_REWINDDIR ||
87 PL_op->op_type == OP_CLOSEDIR ?
88 "dirhandle" : "filehandle";
89 Perl_croak(aTHX_ "Bad symbol for %s", fh);
93 #ifdef GV_UNIQUE_CHECK
95 Perl_croak(aTHX_ "Bad symbol for filehandle (GV is unique)");
104 Perl_gv_fetchfile(pTHX_ const char *name)
114 tmplen = strlen(name) + 2;
115 if (tmplen < sizeof smallbuf)
118 Newx(tmpbuf, tmplen + 1, char);
119 /* This is where the debugger's %{"::_<$filename"} hash is created */
122 memcpy(tmpbuf + 2, name, tmplen - 1);
123 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
125 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
126 #ifdef PERL_DONT_CREATE_GVSV
127 GvSV(gv) = newSVpvn(name, tmplen - 2);
129 sv_setpvn(GvSV(gv), name, tmplen - 2);
132 hv_magic(GvHVn(gv_AVadd(gv)), NULL, PERL_MAGIC_dbfile);
134 if (tmpbuf != smallbuf)
140 =for apidoc gv_const_sv
142 If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
143 inlining, or C<gv> is a placeholder reference that would be promoted to such
144 a typeglob, then returns the value returned by the sub. Otherwise, returns
151 Perl_gv_const_sv(pTHX_ GV *gv)
153 if (SvTYPE(gv) == SVt_PVGV)
154 return cv_const_sv(GvCVu(gv));
155 return SvROK(gv) ? SvRV(gv) : NULL;
159 Perl_newGP(pTHX_ GV *const gv)
162 const char *const file
163 = (PL_curcop && CopFILE(PL_curcop)) ? CopFILE(PL_curcop) : "";
166 #ifndef PERL_DONT_CREATE_GVSV
167 gp->gp_sv = newSV(0);
170 gp->gp_line = PL_curcop ? CopLINE(PL_curcop) : 0;
171 /* XXX Ideally this cast would be replaced with a change to const char*
173 gp->gp_file = (char *) file;
181 Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
183 const bool doproto = SvTYPE(gv) > SVt_NULL;
184 const char * const proto = (doproto && SvPOK(gv)) ? SvPVX_const(gv) : NULL;
185 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
187 assert (!(proto && has_constant));
190 /* The constant has to be a simple scalar type. */
191 switch (SvTYPE(has_constant)) {
197 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
198 sv_reftype(has_constant, 0));
205 sv_upgrade((SV*)gv, SVt_PVGV);
212 Safefree(SvPVX_mutable(gv));
215 GvGP(gv) = Perl_newGP(aTHX_ gv);
216 sv_magic((SV*)gv, (SV*)gv, PERL_MAGIC_glob, NULL, 0);
217 GvSTASH(gv) = (HV*)SvREFCNT_inc(stash);
218 gv_name_set(gv, name, len, GV_ADD);
219 if (multi || doproto) /* doproto means it _was_ mentioned */
221 if (doproto) { /* Replicate part of newSUB here. */
225 /* newCONSTSUB takes ownership of the reference from us. */
226 GvCV(gv) = newCONSTSUB(stash, (char *)name, has_constant);
228 /* XXX unsafe for 5005 threads if eval_owner isn't held */
229 (void) start_subparse(0,0); /* Create empty CV in compcv. */
230 GvCV(gv) = PL_compcv;
236 CvFILE_set_from_cop(GvCV(gv), PL_curcop);
237 CvSTASH(GvCV(gv)) = PL_curstash;
238 #ifdef USE_5005THREADS
239 CvOWNER(GvCV(gv)) = 0;
240 if (!CvMUTEXP(GvCV(gv))) {
241 New(666, CvMUTEXP(GvCV(gv)), 1, perl_mutex);
242 MUTEX_INIT(CvMUTEXP(GvCV(gv)));
244 #endif /* USE_5005THREADS */
246 sv_setpv((SV*)GvCV(gv), proto);
253 S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
265 #ifdef PERL_DONT_CREATE_GVSV
278 =for apidoc gv_fetchmeth
280 Returns the glob with the given C<name> and a defined subroutine or
281 C<NULL>. The glob lives in the given C<stash>, or in the stashes
282 accessible via @ISA and UNIVERSAL::.
284 The argument C<level> should be either 0 or -1. If C<level==0>, as a
285 side-effect creates a glob with the given C<name> in the given C<stash>
286 which in the case of success contains an alias for the subroutine, and sets
287 up caching info for this glob. Similarly for all the searched stashes.
289 This function grants C<"SUPER"> token as a postfix of the stash name. The
290 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
291 visible to Perl code. So when calling C<call_sv>, you should not use
292 the GV directly; instead, you should use the method's CV, which can be
293 obtained from the GV with the C<GvCV> macro.
299 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
307 HV* lastchance = NULL;
309 /* UNIVERSAL methods should be callable without a stash */
311 level = -1; /* probably appropriate */
312 if(!(stash = gv_stashpvs("UNIVERSAL", FALSE)))
316 hvname = HvNAME_get(stash);
319 "Can't use anonymous symbol table for method lookup");
321 if ((level > 100) || (level < -100))
322 Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
325 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
327 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
332 if (SvTYPE(topgv) != SVt_PVGV)
333 gv_init(topgv, stash, name, len, TRUE);
334 if ((cv = GvCV(topgv))) {
335 /* If genuine method or valid cache entry, use it */
336 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
338 /* Stale cached entry: junk it */
340 GvCV(topgv) = cv = Nullcv;
343 else if (GvCVGEN(topgv) == PL_sub_generation)
344 return 0; /* cache indicates sub doesn't exist */
347 gvp = (GV**)hv_fetchs(stash, "ISA", FALSE);
348 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : NULL;
350 /* create and re-create @.*::SUPER::ISA on demand */
351 if (!av || !SvMAGIC(av)) {
352 STRLEN packlen = strlen(hvname);
354 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
358 basestash = gv_stashpvn(hvname, packlen, TRUE);
359 gvp = (GV**)hv_fetchs(basestash, "ISA", FALSE);
360 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
361 gvp = (GV**)hv_fetchs(stash, "ISA", TRUE);
362 if (!gvp || !(gv = *gvp))
363 Perl_croak(aTHX_ "Cannot create %s::ISA", hvname);
364 if (SvTYPE(gv) != SVt_PVGV)
365 gv_init(gv, stash, "ISA", 3, TRUE);
366 SvREFCNT_dec(GvAV(gv));
367 GvAV(gv) = (AV*)SvREFCNT_inc_simple(av);
373 SV** svp = AvARRAY(av);
374 /* NOTE: No support for tied ISA */
375 I32 items = AvFILLp(av) + 1;
377 SV* const sv = *svp++;
378 HV* const basestash = gv_stashsv(sv, FALSE);
380 if (ckWARN(WARN_MISC))
381 Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
385 gv = gv_fetchmeth(basestash, name, len,
386 (level >= 0) ? level + 1 : level - 1);
392 /* if at top level, try UNIVERSAL */
394 if (level == 0 || level == -1) {
395 lastchance = gv_stashpvs("UNIVERSAL", FALSE);
398 if ((gv = gv_fetchmeth(lastchance, name, len,
399 (level >= 0) ? level + 1 : level - 1)))
403 * Cache method in topgv if:
404 * 1. topgv has no synonyms (else inheritance crosses wires)
405 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
408 GvREFCNT(topgv) == 1 &&
410 (CvROOT(cv) || CvXSUB(cv)))
412 if ((cv = GvCV(topgv)))
414 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
415 GvCVGEN(topgv) = PL_sub_generation;
419 else if (topgv && GvREFCNT(topgv) == 1) {
420 /* cache the fact that the method is not defined */
421 GvCVGEN(topgv) = PL_sub_generation;
430 =for apidoc gv_fetchmeth_autoload
432 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
433 Returns a glob for the subroutine.
435 For an autoloaded subroutine without a GV, will create a GV even
436 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
437 of the result may be zero.
443 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
445 GV *gv = gv_fetchmeth(stash, name, len, level);
452 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
453 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
455 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
458 if (!(CvROOT(cv) || CvXSUB(cv)))
460 /* Have an autoload */
461 if (level < 0) /* Cannot do without a stub */
462 gv_fetchmeth(stash, name, len, 0);
463 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
472 =for apidoc gv_fetchmethod_autoload
474 Returns the glob which contains the subroutine to call to invoke the method
475 on the C<stash>. In fact in the presence of autoloading this may be the
476 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
479 The third parameter of C<gv_fetchmethod_autoload> determines whether
480 AUTOLOAD lookup is performed if the given method is not present: non-zero
481 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
482 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
483 with a non-zero C<autoload> parameter.
485 These functions grant C<"SUPER"> token as a prefix of the method name. Note
486 that if you want to keep the returned glob for a long time, you need to
487 check for it being "AUTOLOAD", since at the later time the call may load a
488 different subroutine due to $AUTOLOAD changing its value. Use the glob
489 created via a side effect to do this.
491 These functions have the same side-effects and as C<gv_fetchmeth> with
492 C<level==0>. C<name> should be writable if contains C<':'> or C<'
493 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
494 C<call_sv> apply equally to these functions.
500 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
502 register const char *nend;
503 const char *nsplit = NULL;
507 if (stash && SvTYPE(stash) < SVt_PVHV)
510 for (nend = name; *nend; nend++) {
513 else if (*nend == ':' && *(nend + 1) == ':')
517 const char * const origname = name;
521 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
522 /* ->SUPER::method should really be looked up in original stash */
523 SV * const tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
524 CopSTASHPV(PL_curcop)));
525 /* __PACKAGE__::SUPER stash should be autovivified */
526 stash = gv_stashpvn(SvPVX_const(tmpstr), SvCUR(tmpstr), TRUE);
527 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
528 origname, HvNAME_get(stash), name) );
531 /* don't autovifify if ->NoSuchStash::method */
532 stash = gv_stashpvn(origname, nsplit - origname, FALSE);
534 /* however, explicit calls to Pkg::SUPER::method may
535 happen, and may require autovivification to work */
536 if (!stash && (nsplit - origname) >= 7 &&
537 strnEQ(nsplit - 7, "::SUPER", 7) &&
538 gv_stashpvn(origname, nsplit - origname - 7, FALSE))
539 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
544 gv = gv_fetchmeth(stash, name, nend - name, 0);
546 if (strEQ(name,"import") || strEQ(name,"unimport"))
547 gv = (GV*)&PL_sv_yes;
549 gv = gv_autoload4(ostash, name, nend - name, TRUE);
552 CV* const cv = GvCV(gv);
553 if (!CvROOT(cv) && !CvXSUB(cv)) {
561 if (GvCV(stubgv) != cv) /* orphaned import */
564 autogv = gv_autoload4(GvSTASH(stubgv),
565 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
575 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
582 const char *packname = "";
584 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
587 if (SvTYPE(stash) < SVt_PVHV) {
588 packname = SvPV_nolen_const((SV*)stash);
592 packname = HvNAME_get(stash);
595 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
599 if (!(CvROOT(cv) || CvXSUB(cv)))
603 * Inheriting AUTOLOAD for non-methods works ... for now.
605 if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
606 && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)
608 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
609 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
610 packname, (int)len, name);
612 #ifndef USE_5005THREADS
614 /* rather than lookup/init $AUTOLOAD here
615 * only to have the XSUB do another lookup for $AUTOLOAD
616 * and split that value on the last '::',
617 * pass along the same data via some unused fields in the CV
620 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
627 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
628 * The subroutine's original name may not be "AUTOLOAD", so we don't
629 * use that, but for lack of anything better we will use the sub's
630 * original package to look up $AUTOLOAD.
632 varstash = GvSTASH(CvGV(cv));
633 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
636 #ifdef USE_5005THREADS
637 sv_lock((SV *)varstash);
640 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
641 #ifdef PERL_DONT_CREATE_GVSV
642 GvSV(vargv) = newSV(0);
646 varsv = GvSVn(vargv);
647 #ifdef USE_5005THREADS
650 sv_setpv(varsv, packname);
651 sv_catpvs(varsv, "::");
652 sv_catpvn(varsv, name, len);
656 /* The "gv" parameter should be the glob known to Perl code as *!
657 * The scalar must already have been magicalized.
660 S_require_errno(pTHX_ GV *gv)
662 HV* stash = gv_stashpvs("Errno", FALSE);
664 if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
668 save_scalar(gv); /* keep the value of $! */
669 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
670 newSVpvs("Errno"), NULL);
673 stash = gv_stashpvs("Errno", FALSE);
674 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
675 Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available");
680 =for apidoc gv_stashpv
682 Returns a pointer to the stash for a specified package. C<name> should
683 be a valid UTF-8 string and must be null-terminated. If C<create> is set
684 then the package will be created if it does not already exist. If C<create>
685 is not set and the package does not exist then NULL is returned.
691 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
693 return gv_stashpvn(name, strlen(name), create);
697 =for apidoc gv_stashpvn
699 Returns a pointer to the stash for a specified package. C<name> should
700 be a valid UTF-8 string. The C<namelen> parameter indicates the length of
701 the C<name>, in bytes. If C<create> is set then the package will be
702 created if it does not already exist. If C<create> is not set and the
703 package does not exist then NULL is returned.
709 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
716 if (namelen + 3 < sizeof smallbuf)
719 Newx(tmpbuf, namelen + 3, char);
720 Copy(name,tmpbuf,namelen,char);
721 tmpbuf[namelen++] = ':';
722 tmpbuf[namelen++] = ':';
723 tmpbuf[namelen] = '\0';
724 tmpgv = gv_fetchpvn_flags(tmpbuf, namelen, create, SVt_PVHV);
725 if (tmpbuf != smallbuf)
730 GvHV(tmpgv) = newHV();
732 if (!HvNAME_get(stash))
733 hv_name_set(stash, name, namelen, 0);
738 =for apidoc gv_stashsv
740 Returns a pointer to the stash for a specified package, which must be a
741 valid UTF-8 string. See C<gv_stashpv>.
747 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
750 const char * const ptr = SvPV_const(sv,len);
751 return gv_stashpvn(ptr, len, create);
756 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
757 STRLEN len = strlen (nambeg);
758 return gv_fetchpvn_flags(nambeg, len, add, sv_type);
762 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
764 const char *nambeg = SvPV(name, len);
765 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
769 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
772 register const char *name = nambeg;
773 register GV *gv = NULL;
776 register const char *name_cursor;
778 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
779 const I32 no_expand = flags & GV_NOEXPAND;
781 flags & ~SVf_UTF8 & ~GV_NOADD_NOINIT & ~GV_NOEXPAND & ~GV_NOTQUAL;
782 const char *const name_end = nambeg + full_len;
783 const char *const name_em1 = name_end - 1;
785 if (flags & GV_NOTQUAL) {
786 /* Caller promised that there is no stash, so we can skip the check. */
791 if (full_len > 2 && *name == '*' && isALPHA(name[1])) {
792 /* accidental stringify on a GV? */
796 for (name_cursor = name; name_cursor < name_end; name_cursor++) {
797 if ((*name_cursor == ':' && name_cursor < name_em1
798 && name_cursor[1] == ':')
799 || (*name_cursor == '\'' && name_cursor[1]))
803 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
806 len = name_cursor - name;
811 if (len + 3 < (I32)sizeof (smallbuf))
814 Newx(tmpbuf, len+3, char);
815 Copy(name, tmpbuf, len, char);
819 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
820 gv = gvp ? *gvp : NULL;
821 if (gv && gv != (GV*)&PL_sv_undef) {
822 if (SvTYPE(gv) != SVt_PVGV)
823 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
827 if (tmpbuf != smallbuf)
829 if (!gv || gv == (GV*)&PL_sv_undef)
832 if (!(stash = GvHV(gv)))
833 stash = GvHV(gv) = newHV();
835 if (!HvNAME_get(stash))
836 hv_name_set(stash, nambeg, name_cursor - nambeg, 0);
839 if (*name_cursor == ':')
843 if (name == name_end)
844 return gv ? gv : (GV*)*hv_fetchs(PL_defstash, "main::", TRUE);
847 len = name_cursor - name;
849 /* No stash in name, so see how we can default */
853 if (len && isIDFIRST_lazy(name)) {
862 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
863 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
864 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
868 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
873 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
874 && name[3] == 'I' && name[4] == 'N')
878 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
879 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
880 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
884 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
885 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
893 else if (IN_PERL_COMPILETIME) {
895 if (add && (PL_hints & HINT_STRICT_VARS) &&
896 sv_type != SVt_PVCV &&
897 sv_type != SVt_PVGV &&
898 sv_type != SVt_PVFM &&
899 sv_type != SVt_PVIO &&
900 !(len == 1 && sv_type == SVt_PV &&
901 (*name == 'a' || *name == 'b')) )
903 gvp = (GV**)hv_fetch(stash,name,len,0);
905 *gvp == (GV*)&PL_sv_undef ||
906 SvTYPE(*gvp) != SVt_PVGV)
910 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
911 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
912 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
914 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
915 sv_type == SVt_PVAV ? '@' :
916 sv_type == SVt_PVHV ? '%' : '$',
919 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
925 stash = CopSTASH(PL_curcop);
931 /* By this point we should have a stash and a name */
935 SV * const err = Perl_mess(aTHX_
936 "Global symbol \"%s%s\" requires explicit package name",
937 (sv_type == SVt_PV ? "$"
938 : sv_type == SVt_PVAV ? "@"
939 : sv_type == SVt_PVHV ? "%"
941 if (USE_UTF8_IN_NAMES)
944 stash = PL_nullstash;
950 if (!SvREFCNT(stash)) /* symbol table under destruction */
953 gvp = (GV**)hv_fetch(stash,name,len,add);
954 if (!gvp || *gvp == (GV*)&PL_sv_undef)
957 if (SvTYPE(gv) == SVt_PVGV) {
960 gv_init_sv(gv, sv_type);
961 if (*name=='!' && sv_type == SVt_PVHV && len==1)
965 } else if (no_init) {
967 } else if (no_expand && SvROK(gv)) {
971 /* Adding a new symbol */
973 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
974 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
975 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
976 gv_init_sv(gv, sv_type);
978 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
979 : (PL_dowarn & G_WARN_ON ) ) )
982 /* set up magic where warranted */
987 /* Nothing else to do.
988 The compiler will probably turn the switch statement into a
989 branch table. Make sure we avoid even that small overhead for
990 the common case of lower case variable names. */
994 const char * const name2 = name + 1;
997 if (strEQ(name2, "RGV")) {
998 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1000 else if (strEQ(name2, "RGVOUT")) {
1005 if (strnEQ(name2, "XPORT", 5))
1009 if (strEQ(name2, "SA")) {
1010 AV* const av = GvAVn(gv);
1012 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, NULL, 0);
1013 /* NOTE: No support for tied ISA */
1014 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
1015 && AvFILLp(av) == -1)
1018 av_push(av, newSVpvn(pname = "NDBM_File",9));
1019 gv_stashpvn(pname, 9, TRUE);
1020 av_push(av, newSVpvn(pname = "DB_File",7));
1021 gv_stashpvn(pname, 7, TRUE);
1022 av_push(av, newSVpvn(pname = "GDBM_File",9));
1023 gv_stashpvn(pname, 9, TRUE);
1024 av_push(av, newSVpvn(pname = "SDBM_File",9));
1025 gv_stashpvn(pname, 9, TRUE);
1026 av_push(av, newSVpvn(pname = "ODBM_File",9));
1027 gv_stashpvn(pname, 9, TRUE);
1032 if (strEQ(name2, "VERLOAD")) {
1033 HV* const hv = GvHVn(gv);
1035 hv_magic(hv, NULL, PERL_MAGIC_overload);
1039 if (strEQ(name2, "IG")) {
1043 Newxz(PL_psig_ptr, SIG_SIZE, SV*);
1044 Newxz(PL_psig_name, SIG_SIZE, SV*);
1045 Newxz(PL_psig_pend, SIG_SIZE, int);
1049 hv_magic(hv, NULL, PERL_MAGIC_sig);
1050 for (i = 1; i < SIG_SIZE; i++) {
1051 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1053 sv_setsv(*init, &PL_sv_undef);
1055 PL_psig_name[i] = 0;
1056 PL_psig_pend[i] = 0;
1061 if (strEQ(name2, "ERSION"))
1064 case '\003': /* $^CHILD_ERROR_NATIVE */
1065 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1068 case '\005': /* $^ENCODING */
1069 if (strEQ(name2, "NCODING"))
1072 case '\017': /* $^OPEN */
1073 if (strEQ(name2, "PEN"))
1076 case '\024': /* ${^TAINT} */
1077 if (strEQ(name2, "AINT"))
1080 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1081 if (strEQ(name2, "NICODE"))
1083 if (strEQ(name2, "TF8LOCALE"))
1085 if (strEQ(name2, "TF8CACHE"))
1088 case '\027': /* $^WARNING_BITS */
1089 if (strEQ(name2, "ARNING_BITS"))
1102 /* ensures variable is only digits */
1103 /* ${"1foo"} fails this test (and is thus writeable) */
1104 /* added by japhy, but borrowed from is_gv_magical */
1105 const char *end = name + len;
1106 while (--end > name) {
1107 if (!isDIGIT(*end)) return gv;
1114 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1115 be case '\0' in this switch statement (ie a default case) */
1121 sv_type == SVt_PVAV ||
1122 sv_type == SVt_PVHV ||
1123 sv_type == SVt_PVCV ||
1124 sv_type == SVt_PVFM ||
1127 PL_sawampersand = TRUE;
1131 sv_setpv(GvSVn(gv),PL_chopset);
1135 (void)SvUPGRADE(GvSVn(gv), SVt_PVLV);
1140 /* If %! has been used, automatically load Errno.pm.
1141 The require will itself set errno, so in order to
1142 preserve its value we have to set up the magic
1143 now (rather than going to magicalize)
1146 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1148 if (sv_type == SVt_PVHV)
1154 AV* const av = GvAVn(gv);
1155 sv_magic((SV*)av, NULL, PERL_MAGIC_regdata, NULL, 0);
1161 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1162 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1163 "Use of $%s is deprecated", name);
1166 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1171 AV* const av = GvAVn(gv);
1172 sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, NULL, 0);
1176 case '\023': /* $^S */
1187 SvREADONLY_on(GvSVn(gv));
1202 case '\001': /* $^A */
1203 case '\003': /* $^C */
1204 case '\004': /* $^D */
1205 case '\005': /* $^E */
1206 case '\006': /* $^F */
1207 case '\010': /* $^H */
1208 case '\011': /* $^I, NOT \t in EBCDIC */
1209 case '\016': /* $^N */
1210 case '\017': /* $^O */
1211 case '\020': /* $^P */
1212 case '\024': /* $^T */
1213 case '\027': /* $^W */
1215 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1218 case '\014': /* $^L */
1219 sv_setpvn(GvSVn(gv),"\f",1);
1220 PL_formfeed = GvSVn(gv);
1223 sv_setpvn(GvSVn(gv),"\034",1);
1227 SV * const sv = GvSVn(gv);
1228 (void)SvUPGRADE(sv, SVt_PVNV);
1229 Perl_sv_setpvf(aTHX_ sv,
1230 #if defined(PERL_SUBVERSION) && (PERL_SUBVERSION > 0)
1236 SvNVX(PL_patchlevel));
1237 SvNVX(sv) = SvNVX(PL_patchlevel);
1242 case '\026': /* $^V */
1244 SV * const sv = GvSVn(gv);
1245 GvSV(gv) = SvREFCNT_inc(PL_patchlevel);
1255 Perl_gv_fullname4(pTHX_ SV *sv, GV *gv, const char *prefix, bool keepmain)
1258 const HV * const hv = GvSTASH(gv);
1263 sv_setpv(sv, prefix ? prefix : "");
1265 name = HvNAME_get(hv);
1269 if (keepmain || strNE(name, "main")) {
1273 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1277 Perl_gv_efullname4(pTHX_ SV *sv, GV *gv, const char *prefix, bool keepmain)
1279 const GV * const egv = GvEGV(gv);
1280 gv_fullname4(sv, (GV *) (egv ? egv : gv), prefix, keepmain);
1287 IO * const io = (IO*)newSV(0);
1289 sv_upgrade((SV *)io,SVt_PVIO);
1290 /* This used to read SvREFCNT(io) = 1;
1291 It's not clear why the reference count needed an explicit reset. NWC
1293 assert (SvREFCNT(io) == 1);
1295 /* Clear the stashcache because a new IO could overrule a package name */
1296 hv_clear(PL_stashcache);
1297 iogv = gv_fetchpvs("FileHandle::", 0, SVt_PVHV);
1298 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1299 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1300 iogv = gv_fetchpvs("IO::Handle::", GV_ADD, SVt_PVHV);
1301 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1306 Perl_gv_check(pTHX_ HV *stash)
1310 if (!HvARRAY(stash))
1312 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1314 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1317 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1318 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1320 if (hv != PL_defstash && hv != stash)
1321 gv_check(hv); /* nested package */
1323 else if (isALPHA(*HeKEY(entry))) {
1325 gv = (GV*)HeVAL(entry);
1326 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1329 /* performance hack: if filename is absolute and it's a standard
1330 * module, don't bother warning */
1331 #ifdef MACOS_TRADITIONAL
1332 # define LIB_COMPONENT ":lib:"
1334 # define LIB_COMPONENT "/lib/"
1337 && PERL_FILE_IS_ABSOLUTE(file)
1338 && (instr(file, LIB_COMPONENT) || instr(file, ".pm")))
1342 CopLINE_set(PL_curcop, GvLINE(gv));
1344 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1346 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1348 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1349 "Name \"%s::%s\" used only once: possible typo",
1350 HvNAME_get(stash), GvNAME(gv));
1357 Perl_newGVgen(pTHX_ char *pack)
1359 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1363 /* hopefully this is only called on local symbol table entries */
1366 Perl_gp_ref(pTHX_ GP *gp)
1373 /* multi-named GPs cannot be used for method cache */
1374 SvREFCNT_dec(gp->gp_cv);
1379 /* Adding a new name to a subroutine invalidates method cache */
1380 PL_sub_generation++;
1387 Perl_gp_free(pTHX_ GV *gv)
1391 if (!gv || !(gp = GvGP(gv)))
1393 if (gp->gp_refcnt == 0) {
1394 if (ckWARN_d(WARN_INTERNAL))
1395 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1396 "Attempt to free unreferenced glob pointers"
1397 pTHX__FORMAT pTHX__VALUE);
1401 /* Deleting the name of a subroutine invalidates method cache */
1402 PL_sub_generation++;
1404 if (--gp->gp_refcnt > 0) {
1405 if (gp->gp_egv == gv)
1411 SvREFCNT_dec(gp->gp_sv);
1412 SvREFCNT_dec(gp->gp_av);
1413 /* FIXME - another reference loop GV -> symtab -> GV ?
1414 Somehow gp->gp_hv can end up pointing at freed garbage. */
1415 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1416 /* FIXME strlen HvNAME */
1417 const char *hvname = HvNAME_get(gp->gp_hv);
1418 if (PL_stashcache && hvname)
1419 hv_delete(PL_stashcache, hvname, strlen(hvname), G_DISCARD);
1420 SvREFCNT_dec(gp->gp_hv);
1422 SvREFCNT_dec(gp->gp_io);
1423 SvREFCNT_dec(gp->gp_cv);
1424 SvREFCNT_dec(gp->gp_form);
1431 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1433 AMT * const amtp = (AMT*)mg->mg_ptr;
1434 PERL_UNUSED_ARG(sv);
1436 if (amtp && AMT_AMAGIC(amtp)) {
1438 for (i = 1; i < NofAMmeth; i++) {
1439 CV * const cv = amtp->table[i];
1441 SvREFCNT_dec((SV *) cv);
1442 amtp->table[i] = Nullcv;
1449 /* Updates and caches the CV's */
1452 Perl_Gv_AMupdate(pTHX_ HV *stash)
1454 MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1458 const AMT * const amtp = (AMT*)mg->mg_ptr;
1459 if (amtp->was_ok_am == PL_amagic_generation
1460 && amtp->was_ok_sub == PL_sub_generation) {
1461 return (bool)AMT_OVERLOADED(amtp);
1463 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1466 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1469 amt.was_ok_am = PL_amagic_generation;
1470 amt.was_ok_sub = PL_sub_generation;
1471 amt.fallback = AMGfallNO;
1475 int filled = 0, have_ovl = 0;
1478 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1480 /* Try to find via inheritance. */
1481 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1482 SV * const sv = gv ? GvSV(gv) : NULL;
1486 lim = DESTROY_amg; /* Skip overloading entries. */
1487 #ifdef PERL_DONT_CREATE_GVSV
1489 NOOP; /* Equivalent to !SvTRUE and !SvOK */
1492 else if (SvTRUE(sv))
1493 amt.fallback=AMGfallYES;
1495 amt.fallback=AMGfallNEVER;
1497 for (i = 1; i < lim; i++)
1498 amt.table[i] = Nullcv;
1499 for (; i < NofAMmeth; i++) {
1500 const char * const cooky = PL_AMG_names[i];
1501 /* Human-readable form, for debugging: */
1502 const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1503 const STRLEN l = strlen(cooky);
1505 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1506 cp, HvNAME_get(stash)) );
1507 /* don't fill the cache while looking up!
1508 Creation of inheritance stubs in intermediate packages may
1509 conflict with the logic of runtime method substitution.
1510 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1511 then we could have created stubs for "(+0" in A and C too.
1512 But if B overloads "bool", we may want to use it for
1513 numifying instead of C's "+0". */
1514 if (i >= DESTROY_amg)
1515 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1516 else /* Autoload taken care of below */
1517 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1519 if (gv && (cv = GvCV(gv))) {
1521 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1522 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1523 /* This is a hack to support autoloading..., while
1524 knowing *which* methods were declared as overloaded. */
1525 /* GvSV contains the name of the method. */
1527 SV *gvsv = GvSV(gv);
1529 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1530 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1531 (void*)GvSV(gv), cp, hvname) );
1532 if (!gvsv || !SvPOK(gvsv)
1533 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1536 /* Can be an import stub (created by "can"). */
1537 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1538 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1539 "in package \"%.256s\"",
1540 (GvCVGEN(gv) ? "Stub found while resolving"
1544 cv = GvCV(gv = ngv);
1546 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1547 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1548 GvNAME(CvGV(cv))) );
1550 if (i < DESTROY_amg)
1552 } else if (gv) { /* Autoloaded... */
1556 amt.table[i]=(CV*)SvREFCNT_inc_simple(cv);
1559 AMT_AMAGIC_on(&amt);
1561 AMT_OVERLOADED_on(&amt);
1562 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1563 (char*)&amt, sizeof(AMT));
1567 /* Here we have no table: */
1569 AMT_AMAGIC_off(&amt);
1570 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1571 (char*)&amt, sizeof(AMTS));
1577 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1582 if (!stash || !HvNAME_get(stash))
1584 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1588 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1590 amtp = (AMT*)mg->mg_ptr;
1591 if ( amtp->was_ok_am != PL_amagic_generation
1592 || amtp->was_ok_sub != PL_sub_generation )
1594 if (AMT_AMAGIC(amtp)) {
1595 CV * const ret = amtp->table[id];
1596 if (ret && isGV(ret)) { /* Autoloading stab */
1597 /* Passing it through may have resulted in a warning
1598 "Inherited AUTOLOAD for a non-method deprecated", since
1599 our caller is going through a function call, not a method call.
1600 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1601 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1614 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1618 CV **cvp=NULL, **ocvp=NULL;
1619 AMT *amtp=NULL, *oamtp=NULL;
1620 int off = 0, off1, lr = 0, notfound = 0;
1621 int postpr = 0, force_cpy = 0;
1622 int assign = AMGf_assign & flags;
1623 const int assignshift = assign ? 1 : 0;
1628 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1629 && (stash = SvSTASH(SvRV(left)))
1630 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1631 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1632 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1634 && ((cv = cvp[off=method+assignshift])
1635 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1641 cv = cvp[off=method])))) {
1642 lr = -1; /* Call method for left argument */
1644 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1647 /* look for substituted methods */
1648 /* In all the covered cases we should be called with assign==0. */
1652 if ((cv = cvp[off=add_ass_amg])
1653 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1654 right = &PL_sv_yes; lr = -1; assign = 1;
1659 if ((cv = cvp[off = subtr_ass_amg])
1660 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1661 right = &PL_sv_yes; lr = -1; assign = 1;
1665 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1668 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1671 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1674 (void)((cv = cvp[off=bool__amg])
1675 || (cv = cvp[off=numer_amg])
1676 || (cv = cvp[off=string_amg]));
1682 * SV* ref causes confusion with the interpreter variable of
1685 SV* const tmpRef=SvRV(left);
1686 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1688 * Just to be extra cautious. Maybe in some
1689 * additional cases sv_setsv is safe, too.
1691 SV* const newref = newSVsv(tmpRef);
1692 SvOBJECT_on(newref);
1693 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1699 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1700 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1701 SV* const nullsv=sv_2mortal(newSViv(0));
1703 SV* const lessp = amagic_call(left,nullsv,
1704 lt_amg,AMGf_noright);
1705 logic = SvTRUE(lessp);
1707 SV* const lessp = amagic_call(left,nullsv,
1708 ncmp_amg,AMGf_noright);
1709 logic = (SvNV(lessp) < 0);
1712 if (off==subtr_amg) {
1723 if ((cv = cvp[off=subtr_amg])) {
1725 left = sv_2mortal(newSViv(0));
1730 case iter_amg: /* XXXX Eventually should do to_gv. */
1732 return NULL; /* Delegate operation to standard mechanisms. */
1740 return left; /* Delegate operation to standard mechanisms. */
1745 if (!cv) goto not_found;
1746 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1747 && (stash = SvSTASH(SvRV(right)))
1748 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1749 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1750 ? (amtp = (AMT*)mg->mg_ptr)->table
1752 && (cv = cvp[off=method])) { /* Method for right
1755 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1756 && (cvp=ocvp) && (lr = -1))
1757 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1758 && !(flags & AMGf_unary)) {
1759 /* We look for substitution for
1760 * comparison operations and
1762 if (method==concat_amg || method==concat_ass_amg
1763 || method==repeat_amg || method==repeat_ass_amg) {
1764 return NULL; /* Delegate operation to string conversion */
1774 postpr = 1; off=ncmp_amg; break;
1781 postpr = 1; off=scmp_amg; break;
1783 if (off != -1) cv = cvp[off];
1788 not_found: /* No method found, either report or croak */
1796 return left; /* Delegate operation to standard mechanisms. */
1799 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1800 notfound = 1; lr = -1;
1801 } else if (cvp && (cv=cvp[nomethod_amg])) {
1802 notfound = 1; lr = 1;
1803 } else if ((amtp && amtp->fallback >= AMGfallYES) && !DEBUG_o_TEST) {
1804 /* Skip generating the "no method found" message. */
1808 if (off==-1) off=method;
1809 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1810 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1811 AMG_id2name(method + assignshift),
1812 (flags & AMGf_unary ? " " : "\n\tleft "),
1814 "in overloaded package ":
1815 "has no overloaded magic",
1817 HvNAME_get(SvSTASH(SvRV(left))):
1820 ",\n\tright argument in overloaded package ":
1823 : ",\n\tright argument has no overloaded magic"),
1825 HvNAME_get(SvSTASH(SvRV(right))):
1827 if (amtp && amtp->fallback >= AMGfallYES) {
1828 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1830 Perl_croak(aTHX_ "%"SVf, (void*)msg);
1834 force_cpy = force_cpy || assign;
1839 DEBUG_o(Perl_deb(aTHX_
1840 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1842 method+assignshift==off? "" :
1844 method+assignshift==off? "" :
1845 AMG_id2name(method+assignshift),
1846 method+assignshift==off? "" : "\")",
1847 flags & AMGf_unary? "" :
1848 lr==1 ? " for right argument": " for left argument",
1849 flags & AMGf_unary? " for argument" : "",
1850 stash ? HvNAME_get(stash) : "null",
1851 fl? ",\n\tassignment variant used": "") );
1854 /* Since we use shallow copy during assignment, we need
1855 * to dublicate the contents, probably calling user-supplied
1856 * version of copy operator
1858 /* We need to copy in following cases:
1859 * a) Assignment form was called.
1860 * assignshift==1, assign==T, method + 1 == off
1861 * b) Increment or decrement, called directly.
1862 * assignshift==0, assign==0, method + 0 == off
1863 * c) Increment or decrement, translated to assignment add/subtr.
1864 * assignshift==0, assign==T,
1866 * d) Increment or decrement, translated to nomethod.
1867 * assignshift==0, assign==0,
1869 * e) Assignment form translated to nomethod.
1870 * assignshift==1, assign==T, method + 1 != off
1873 /* off is method, method+assignshift, or a result of opcode substitution.
1874 * In the latter case assignshift==0, so only notfound case is important.
1876 if (( (method + assignshift == off)
1877 && (assign || (method == inc_amg) || (method == dec_amg)))
1884 const bool oldcatch = CATCH_GET;
1887 Zero(&myop, 1, BINOP);
1888 myop.op_last = (OP *) &myop;
1889 myop.op_next = NULL;
1890 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1892 PUSHSTACKi(PERLSI_OVERLOAD);
1895 PL_op = (OP *) &myop;
1896 if (PERLDB_SUB && PL_curstash != PL_debstash)
1897 PL_op->op_private |= OPpENTERSUB_DB;
1901 EXTEND(SP, notfound + 5);
1902 PUSHs(lr>0? right: left);
1903 PUSHs(lr>0? left: right);
1904 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1906 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1911 if ((PL_op = Perl_pp_entersub(aTHX)))
1919 CATCH_SET(oldcatch);
1926 ans=SvIV(res)<=0; break;
1929 ans=SvIV(res)<0; break;
1932 ans=SvIV(res)>=0; break;
1935 ans=SvIV(res)>0; break;
1938 ans=SvIV(res)==0; break;
1941 ans=SvIV(res)!=0; break;
1944 SvSetSV(left,res); return left;
1946 ans=!SvTRUE(res); break;
1951 } else if (method==copy_amg) {
1953 Perl_croak(aTHX_ "Copy method did not return a reference");
1955 return SvREFCNT_inc(SvRV(res));
1963 =for apidoc is_gv_magical
1965 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
1971 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
1974 char *temp = SvPV(name, len);
1975 return is_gv_magical(temp, len, flags);
1979 =for apidoc is_gv_magical
1981 Returns C<TRUE> if given the name of a magical GV.
1983 Currently only useful internally when determining if a GV should be
1984 created even in rvalue contexts.
1986 C<flags> is not used at present but available for future extension to
1987 allow selecting particular classes of magical variable.
1989 Currently assumes that C<name> is NUL terminated (as well as len being valid).
1990 This assumption is met by all callers within the perl core, which all pass
1991 pointers returned by SvPV.
1996 Perl_is_gv_magical(pTHX_ char *name, STRLEN len, U32 flags)
1998 PERL_UNUSED_ARG(flags);
2001 const char * const name1 = name + 1;
2004 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
2008 if (len == 8 && strEQ(name1, "VERLOAD"))
2012 if (len == 3 && name[1] == 'I' && name[2] == 'G')
2015 /* Using ${^...} variables is likely to be sufficiently rare that
2016 it seems sensible to avoid the space hit of also checking the
2018 case '\017': /* ${^OPEN} */
2019 if (strEQ(name1, "PEN"))
2022 case '\024': /* ${^TAINT} */
2023 if (strEQ(name1, "AINT"))
2026 case '\025': /* ${^UNICODE} */
2027 if (strEQ(name1, "NICODE"))
2029 if (strEQ(name1, "TF8LOCALE"))
2032 case '\027': /* ${^WARNING_BITS} */
2033 if (strEQ(name1, "ARNING_BITS"))
2046 const char *end = name + len;
2047 while (--end > name) {
2055 /* Because we're already assuming that name is NUL terminated
2056 below, we can treat an empty name as "\0" */
2084 case '\001': /* $^A */
2085 case '\003': /* $^C */
2086 case '\004': /* $^D */
2087 case '\005': /* $^E */
2088 case '\006': /* $^F */
2089 case '\010': /* $^H */
2090 case '\011': /* $^I, NOT \t in EBCDIC */
2091 case '\014': /* $^L */
2092 case '\016': /* $^N */
2093 case '\017': /* $^O */
2094 case '\020': /* $^P */
2095 case '\023': /* $^S */
2096 case '\024': /* $^T */
2097 case '\026': /* $^V */
2098 case '\027': /* $^W */
2118 Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
2121 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
2123 if (!(flags & GV_ADD)) {
2124 Safefree(GvXPVGV(gv)->xgv_name);
2126 GvXPVGV(gv)->xgv_name = name ? savepvn(name, len) : NULL;
2127 GvXPVGV(gv)->xgv_namelen = len;
2132 * c-indentation-style: bsd
2134 * indent-tabs-mode: t
2137 * ex: set ts=8 sts=4 sw=4 noet: