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 $foo, @foo, %foo.
27 GVs are usually found as values in stashes (symbol table hashes) where
28 Perl stores its global variables.
37 const char S_autoload[] = "AUTOLOAD";
38 const STRLEN S_autolen = sizeof(S_autoload)-1;
41 #ifdef PERL_DONT_CREATE_GVSV
43 Perl_gv_SVadd(pTHX_ GV *gv)
45 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
46 Perl_croak(aTHX_ "Bad symbol for scalar");
48 GvSV(gv) = NEWSV(72,0);
54 Perl_gv_AVadd(pTHX_ register GV *gv)
56 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
57 Perl_croak(aTHX_ "Bad symbol for array");
64 Perl_gv_HVadd(pTHX_ register GV *gv)
66 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
67 Perl_croak(aTHX_ "Bad symbol for hash");
74 Perl_gv_IOadd(pTHX_ register GV *gv)
76 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
77 Perl_croak(aTHX_ "Bad symbol for filehandle");
79 #ifdef GV_UNIQUE_CHECK
81 Perl_croak(aTHX_ "Bad symbol for filehandle (GV is unique)");
90 Perl_gv_fetchfile(pTHX_ const char *name)
100 tmplen = strlen(name) + 2;
101 if (tmplen < sizeof smallbuf)
104 Newx(tmpbuf, tmplen + 1, char);
105 /* This is where the debugger's %{"::_<$filename"} hash is created */
108 memcpy(tmpbuf + 2, name, tmplen - 1);
109 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
111 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
112 #ifdef PERL_DONT_CREATE_GVSV
113 GvSV(gv) = newSVpvn(name, tmplen - 2);
115 sv_setpvn(GvSV(gv), name, tmplen - 2);
118 hv_magic(GvHVn(gv_AVadd(gv)), NULL, PERL_MAGIC_dbfile);
120 if (tmpbuf != smallbuf)
126 =for apidoc gv_const_sv
128 If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
129 inlining, or C<gv> is a placeholder reference that would be promoted to such
130 a typeglob, then returns the value returned by the sub. Otherwise, returns
137 Perl_gv_const_sv(pTHX_ GV *gv)
139 if (SvTYPE(gv) == SVt_PVGV)
140 return cv_const_sv(GvCVu(gv));
141 return SvROK(gv) ? SvRV(gv) : NULL;
145 Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
148 const bool doproto = SvTYPE(gv) > SVt_NULL;
149 const char * const proto = (doproto && SvPOK(gv)) ? SvPVX_const(gv) : NULL;
150 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
152 assert (!(proto && has_constant));
155 /* The constant has to be a simple scalar type. */
156 switch (SvTYPE(has_constant)) {
162 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
163 sv_reftype(has_constant, 0));
169 sv_upgrade((SV*)gv, SVt_PVGV);
176 Safefree(SvPVX_mutable(gv));
179 GvGP(gv) = gp_ref(gp);
180 #ifdef PERL_DONT_CREATE_GVSV
183 GvSV(gv) = NEWSV(72,0);
186 /* We can get in the messy situation of the COP that PL_curcop pointed
187 to getting freed, and as part of the same free overloading decides
188 to look for DESTROY, which gets us in here, needing to *create* a
190 GvLINE(gv) = CopLINE(PL_curcop);
191 /* XXX Ideally this cast would be replaced with a change to const char*
193 GvFILE(gv) = CopFILE(PL_curcop) ? CopFILE(PL_curcop) : (char *) "";
196 GvFILE(gv) = (char *) "";
200 sv_magic((SV*)gv, (SV*)gv, PERL_MAGIC_glob, NULL, 0);
201 GvSTASH(gv) = (HV*)SvREFCNT_inc(stash);
202 GvNAME(gv) = savepvn(name, len);
204 if (multi || doproto) /* doproto means it _was_ mentioned */
206 if (doproto) { /* Replicate part of newSUB here. */
210 /* newCONSTSUB takes ownership of the reference from us. */
211 GvCV(gv) = newCONSTSUB(stash, (char *)name, has_constant);
213 /* XXX unsafe for threads if eval_owner isn't held */
214 (void) start_subparse(0,0); /* Create empty CV in compcv. */
215 GvCV(gv) = PL_compcv;
221 CvFILE_set_from_cop(GvCV(gv), PL_curcop);
222 CvSTASH(GvCV(gv)) = PL_curstash;
223 #ifdef USE_5005THREADS
224 CvOWNER(GvCV(gv)) = 0;
225 if (!CvMUTEXP(GvCV(gv))) {
226 New(666, CvMUTEXP(GvCV(gv)), 1, perl_mutex);
227 MUTEX_INIT(CvMUTEXP(GvCV(gv)));
229 #endif /* USE_5005THREADS */
231 sv_setpv((SV*)GvCV(gv), proto);
238 S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
250 #ifdef PERL_DONT_CREATE_GVSV
263 =for apidoc gv_fetchmeth
265 Returns the glob with the given C<name> and a defined subroutine or
266 C<NULL>. The glob lives in the given C<stash>, or in the stashes
267 accessible via @ISA and UNIVERSAL::.
269 The argument C<level> should be either 0 or -1. If C<level==0>, as a
270 side-effect creates a glob with the given C<name> in the given C<stash>
271 which in the case of success contains an alias for the subroutine, and sets
272 up caching info for this glob. Similarly for all the searched stashes.
274 This function grants C<"SUPER"> token as a postfix of the stash name. The
275 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
276 visible to Perl code. So when calling C<call_sv>, you should not use
277 the GV directly; instead, you should use the method's CV, which can be
278 obtained from the GV with the C<GvCV> macro.
284 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
293 /* UNIVERSAL methods should be callable without a stash */
295 level = -1; /* probably appropriate */
296 if(!(stash = gv_stashpvn("UNIVERSAL", 9, FALSE)))
300 hvname = HvNAME_get(stash);
303 "Can't use anonymous symbol table for method lookup");
305 if ((level > 100) || (level < -100))
306 Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
309 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
311 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
316 if (SvTYPE(topgv) != SVt_PVGV)
317 gv_init(topgv, stash, name, len, TRUE);
318 if ((cv = GvCV(topgv))) {
319 /* If genuine method or valid cache entry, use it */
320 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
322 /* Stale cached entry: junk it */
324 GvCV(topgv) = cv = Nullcv;
327 else if (GvCVGEN(topgv) == PL_sub_generation)
328 return 0; /* cache indicates sub doesn't exist */
331 gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE);
332 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : NULL;
334 /* create and re-create @.*::SUPER::ISA on demand */
335 if (!av || !SvMAGIC(av)) {
336 STRLEN packlen = strlen(hvname);
338 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
342 basestash = gv_stashpvn(hvname, packlen, TRUE);
343 gvp = (GV**)hv_fetch(basestash, "ISA", 3, FALSE);
344 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
345 gvp = (GV**)hv_fetch(stash, "ISA", 3, TRUE);
346 if (!gvp || !(gv = *gvp))
347 Perl_croak(aTHX_ "Cannot create %s::ISA", hvname);
348 if (SvTYPE(gv) != SVt_PVGV)
349 gv_init(gv, stash, "ISA", 3, TRUE);
350 SvREFCNT_dec(GvAV(gv));
351 GvAV(gv) = (AV*)SvREFCNT_inc_simple(av);
357 SV** svp = AvARRAY(av);
358 /* NOTE: No support for tied ISA */
359 I32 items = AvFILLp(av) + 1;
361 SV* const sv = *svp++;
362 HV* const basestash = gv_stashsv(sv, FALSE);
364 if (ckWARN(WARN_MISC))
365 Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
369 gv = gv_fetchmeth(basestash, name, len,
370 (level >= 0) ? level + 1 : level - 1);
376 /* if at top level, try UNIVERSAL */
378 if (level == 0 || level == -1) {
379 HV* const lastchance = gv_stashpvn("UNIVERSAL", 9, FALSE);
382 if ((gv = gv_fetchmeth(lastchance, name, len,
383 (level >= 0) ? level + 1 : level - 1)))
387 * Cache method in topgv if:
388 * 1. topgv has no synonyms (else inheritance crosses wires)
389 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
392 GvREFCNT(topgv) == 1 &&
394 (CvROOT(cv) || CvXSUB(cv)))
396 if ((cv = GvCV(topgv)))
398 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
399 GvCVGEN(topgv) = PL_sub_generation;
403 else if (topgv && GvREFCNT(topgv) == 1) {
404 /* cache the fact that the method is not defined */
405 GvCVGEN(topgv) = PL_sub_generation;
414 =for apidoc gv_fetchmeth_autoload
416 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
417 Returns a glob for the subroutine.
419 For an autoloaded subroutine without a GV, will create a GV even
420 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
421 of the result may be zero.
427 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
429 GV *gv = gv_fetchmeth(stash, name, len, level);
436 return Nullgv; /* UNIVERSAL::AUTOLOAD could cause trouble */
437 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
439 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
442 if (!(CvROOT(cv) || CvXSUB(cv)))
444 /* Have an autoload */
445 if (level < 0) /* Cannot do without a stub */
446 gv_fetchmeth(stash, name, len, 0);
447 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
456 =for apidoc gv_fetchmethod_autoload
458 Returns the glob which contains the subroutine to call to invoke the method
459 on the C<stash>. In fact in the presence of autoloading this may be the
460 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
463 The third parameter of C<gv_fetchmethod_autoload> determines whether
464 AUTOLOAD lookup is performed if the given method is not present: non-zero
465 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
466 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
467 with a non-zero C<autoload> parameter.
469 These functions grant C<"SUPER"> token as a prefix of the method name. Note
470 that if you want to keep the returned glob for a long time, you need to
471 check for it being "AUTOLOAD", since at the later time the call may load a
472 different subroutine due to $AUTOLOAD changing its value. Use the glob
473 created via a side effect to do this.
475 These functions have the same side-effects and as C<gv_fetchmeth> with
476 C<level==0>. C<name> should be writable if contains C<':'> or C<'
477 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
478 C<call_sv> apply equally to these functions.
484 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
486 register const char *nend;
487 const char *nsplit = NULL;
491 if (stash && SvTYPE(stash) < SVt_PVHV)
494 for (nend = name; *nend; nend++) {
497 else if (*nend == ':' && *(nend + 1) == ':')
501 const char * const origname = name;
505 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
506 /* ->SUPER::method should really be looked up in original stash */
507 SV * const tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
508 CopSTASHPV(PL_curcop)));
509 /* __PACKAGE__::SUPER stash should be autovivified */
510 stash = gv_stashpvn(SvPVX_const(tmpstr), SvCUR(tmpstr), TRUE);
511 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
512 origname, HvNAME_get(stash), name) );
515 /* don't autovifify if ->NoSuchStash::method */
516 stash = gv_stashpvn(origname, nsplit - origname, FALSE);
518 /* however, explicit calls to Pkg::SUPER::method may
519 happen, and may require autovivification to work */
520 if (!stash && (nsplit - origname) >= 7 &&
521 strnEQ(nsplit - 7, "::SUPER", 7) &&
522 gv_stashpvn(origname, nsplit - origname - 7, FALSE))
523 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
528 gv = gv_fetchmeth(stash, name, nend - name, 0);
530 if (strEQ(name,"import") || strEQ(name,"unimport"))
531 gv = (GV*)&PL_sv_yes;
533 gv = gv_autoload4(ostash, name, nend - name, TRUE);
536 CV* const cv = GvCV(gv);
537 if (!CvROOT(cv) && !CvXSUB(cv)) {
545 if (GvCV(stubgv) != cv) /* orphaned import */
548 autogv = gv_autoload4(GvSTASH(stubgv),
549 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
559 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
566 const char *packname = "";
568 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
571 if (SvTYPE(stash) < SVt_PVHV) {
572 packname = SvPV_nolen_const((SV*)stash);
576 packname = HvNAME_get(stash);
579 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
583 if (!(CvROOT(cv) || CvXSUB(cv)))
587 * Inheriting AUTOLOAD for non-methods works ... for now.
589 if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
590 && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)
592 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
593 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
594 packname, (int)len, name);
596 #ifndef USE_5005THREADS
598 /* rather than lookup/init $AUTOLOAD here
599 * only to have the XSUB do another lookup for $AUTOLOAD
600 * and split that value on the last '::',
601 * pass along the same data via some unused fields in the CV
604 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
611 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
612 * The subroutine's original name may not be "AUTOLOAD", so we don't
613 * use that, but for lack of anything better we will use the sub's
614 * original package to look up $AUTOLOAD.
616 varstash = GvSTASH(CvGV(cv));
617 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
620 #ifdef USE_5005THREADS
621 sv_lock((SV *)varstash);
624 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
625 #ifdef PERL_DONT_CREATE_GVSV
626 GvSV(vargv) = NEWSV(72,0);
630 varsv = GvSVn(vargv);
631 #ifdef USE_5005THREADS
634 sv_setpv(varsv, packname);
635 sv_catpvn(varsv, "::", 2);
636 sv_catpvn(varsv, name, len);
637 SvTAINTED_off(varsv);
641 /* The "gv" parameter should be the glob known to Perl code as *!
642 * The scalar must already have been magicalized.
645 S_require_errno(pTHX_ GV *gv)
647 HV* stash = gv_stashpvn("Errno",5,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 newSVpvn("Errno",5), NULL);
658 stash = gv_stashpvn("Errno",5,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 STRLEN len = strlen (nambeg);
743 return gv_fetchpvn_flags(nambeg, len, add, sv_type);
747 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
749 const char *nambeg = SvPV(name, len);
750 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
754 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 *name_cursor;
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;
766 const char *const name_end = nambeg + full_len;
767 const char *const name_em1 = name_end - 1;
769 if (full_len > 2 && *name == '*' && isALPHA(name[1])) {
770 /* accidental stringify on a GV? */
774 for (name_cursor = name; name_cursor < name_end; name_cursor++) {
775 if ((*name_cursor == ':' && name_cursor < name_em1
776 && name_cursor[1] == ':')
777 || (*name_cursor == '\'' && name_cursor[1]))
781 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
784 len = name_cursor - name;
789 if (len + 3 < sizeof (smallbuf))
792 Newx(tmpbuf, len+3, char);
793 Copy(name, tmpbuf, len, char);
797 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
798 gv = gvp ? *gvp : NULL;
799 if (gv && gv != (GV*)&PL_sv_undef) {
800 if (SvTYPE(gv) != SVt_PVGV)
801 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
805 if (tmpbuf != smallbuf)
807 if (!gv || gv == (GV*)&PL_sv_undef)
810 if (!(stash = GvHV(gv)))
811 stash = GvHV(gv) = newHV();
813 if (!HvNAME_get(stash))
814 hv_name_set(stash, nambeg, name_cursor - nambeg, 0);
817 if (*name_cursor == ':')
821 if (name == name_end)
822 return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE);
825 len = name_cursor - name;
827 /* No stash in name, so see how we can default */
830 if (len && isIDFIRST_lazy(name)) {
839 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
840 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
841 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
845 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
850 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
851 && name[3] == 'I' && name[4] == 'N')
855 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
856 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
857 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
861 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
862 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
870 else if (IN_PERL_COMPILETIME) {
872 if (add && (PL_hints & HINT_STRICT_VARS) &&
873 sv_type != SVt_PVCV &&
874 sv_type != SVt_PVGV &&
875 sv_type != SVt_PVFM &&
876 sv_type != SVt_PVIO &&
877 !(len == 1 && sv_type == SVt_PV &&
878 (*name == 'a' || *name == 'b')) )
880 gvp = (GV**)hv_fetch(stash,name,len,0);
882 *gvp == (GV*)&PL_sv_undef ||
883 SvTYPE(*gvp) != SVt_PVGV)
887 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
888 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
889 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
891 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
892 sv_type == SVt_PVAV ? '@' :
893 sv_type == SVt_PVHV ? '%' : '$',
896 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
902 stash = CopSTASH(PL_curcop);
908 /* By this point we should have a stash and a name */
912 SV * const err = Perl_mess(aTHX_
913 "Global symbol \"%s%s\" requires explicit package name",
914 (sv_type == SVt_PV ? "$"
915 : sv_type == SVt_PVAV ? "@"
916 : sv_type == SVt_PVHV ? "%"
918 if (USE_UTF8_IN_NAMES)
921 stash = PL_nullstash;
927 if (!SvREFCNT(stash)) /* symbol table under destruction */
930 gvp = (GV**)hv_fetch(stash,name,len,add);
931 if (!gvp || *gvp == (GV*)&PL_sv_undef)
934 if (SvTYPE(gv) == SVt_PVGV) {
937 gv_init_sv(gv, sv_type);
938 if (*name=='!' && sv_type == SVt_PVHV && len==1)
942 } else if (no_init) {
944 } else if (no_expand && SvROK(gv)) {
948 /* Adding a new symbol */
950 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
951 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
952 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
953 gv_init_sv(gv, sv_type);
955 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
956 : (PL_dowarn & G_WARN_ON ) ) )
959 /* set up magic where warranted */
963 /* Nothing else to do.
964 The compiler will probably turn the switch statement into a
965 branch table. Make sure we avoid even that small overhead for
966 the common case of lower case variable names. */
970 const char * const name2 = name + 1;
973 if (strEQ(name2, "RGV")) {
974 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
978 if (strnEQ(name2, "XPORT", 5))
982 if (strEQ(name2, "SA")) {
983 AV* const av = GvAVn(gv);
985 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, NULL, 0);
986 /* NOTE: No support for tied ISA */
987 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
988 && AvFILLp(av) == -1)
991 av_push(av, newSVpvn(pname = "NDBM_File",9));
992 gv_stashpvn(pname, 9, TRUE);
993 av_push(av, newSVpvn(pname = "DB_File",7));
994 gv_stashpvn(pname, 7, TRUE);
995 av_push(av, newSVpvn(pname = "GDBM_File",9));
996 gv_stashpvn(pname, 9, TRUE);
997 av_push(av, newSVpvn(pname = "SDBM_File",9));
998 gv_stashpvn(pname, 9, TRUE);
999 av_push(av, newSVpvn(pname = "ODBM_File",9));
1000 gv_stashpvn(pname, 9, TRUE);
1005 if (strEQ(name2, "VERLOAD")) {
1006 HV* const hv = GvHVn(gv);
1008 hv_magic(hv, NULL, PERL_MAGIC_overload);
1012 if (strEQ(name2, "IG")) {
1016 Newxz(PL_psig_ptr, SIG_SIZE, SV*);
1017 Newxz(PL_psig_name, SIG_SIZE, SV*);
1018 Newxz(PL_psig_pend, SIG_SIZE, int);
1022 hv_magic(hv, NULL, PERL_MAGIC_sig);
1023 for (i = 1; i < SIG_SIZE; i++) {
1024 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1026 sv_setsv(*init, &PL_sv_undef);
1028 PL_psig_name[i] = 0;
1029 PL_psig_pend[i] = 0;
1034 if (strEQ(name2, "ERSION"))
1037 case '\003': /* $^CHILD_ERROR_NATIVE */
1038 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1041 case '\005': /* $^ENCODING */
1042 if (strEQ(name2, "NCODING"))
1045 case '\017': /* $^OPEN */
1046 if (strEQ(name2, "PEN"))
1049 case '\024': /* ${^TAINT} */
1050 if (strEQ(name2, "AINT"))
1053 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1054 if (strEQ(name2, "NICODE"))
1056 if (strEQ(name2, "TF8LOCALE"))
1058 if (strEQ(name2, "TF8CACHE"))
1061 case '\027': /* $^WARNING_BITS */
1062 if (strEQ(name2, "ARNING_BITS"))
1075 /* ensures variable is only digits */
1076 /* ${"1foo"} fails this test (and is thus writeable) */
1077 /* added by japhy, but borrowed from is_gv_magical */
1078 const char *end = name + len;
1079 while (--end > name) {
1080 if (!isDIGIT(*end)) return gv;
1087 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1088 be case '\0' in this switch statement (ie a default case) */
1094 sv_type == SVt_PVAV ||
1095 sv_type == SVt_PVHV ||
1096 sv_type == SVt_PVCV ||
1097 sv_type == SVt_PVFM ||
1100 PL_sawampersand = TRUE;
1104 sv_setpv(GvSVn(gv),PL_chopset);
1108 (void)SvUPGRADE(GvSVn(gv), SVt_PVLV);
1113 /* If %! has been used, automatically load Errno.pm.
1114 The require will itself set errno, so in order to
1115 preserve its value we have to set up the magic
1116 now (rather than going to magicalize)
1119 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1121 if (sv_type == SVt_PVHV)
1127 AV* const av = GvAVn(gv);
1128 sv_magic((SV*)av, NULL, PERL_MAGIC_regdata, NULL, 0);
1134 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1135 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1136 "Use of $%s is deprecated", name);
1139 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1144 AV* const av = GvAVn(gv);
1145 sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, NULL, 0);
1149 case '\023': /* $^S */
1160 SvREADONLY_on(GvSVn(gv));
1175 case '\001': /* $^A */
1176 case '\003': /* $^C */
1177 case '\004': /* $^D */
1178 case '\005': /* $^E */
1179 case '\006': /* $^F */
1180 case '\010': /* $^H */
1181 case '\011': /* $^I, NOT \t in EBCDIC */
1182 case '\016': /* $^N */
1183 case '\017': /* $^O */
1184 case '\020': /* $^P */
1185 case '\024': /* $^T */
1186 case '\027': /* $^W */
1188 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1191 case '\014': /* $^L */
1192 sv_setpvn(GvSVn(gv),"\f",1);
1193 PL_formfeed = GvSVn(gv);
1196 sv_setpvn(GvSVn(gv),"\034",1);
1200 SV * const sv = GvSVn(gv);
1201 (void)SvUPGRADE(sv, SVt_PVNV);
1202 Perl_sv_setpvf(aTHX_ sv,
1203 #if defined(PERL_SUBVERSION) && (PERL_SUBVERSION > 0)
1209 SvNVX(PL_patchlevel));
1210 SvNVX(sv) = SvNVX(PL_patchlevel);
1215 case '\026': /* $^V */
1217 SV * const sv = GvSVn(gv);
1218 GvSV(gv) = SvREFCNT_inc(PL_patchlevel);
1228 Perl_gv_fullname4(pTHX_ SV *sv, GV *gv, const char *prefix, bool keepmain)
1231 const HV * const hv = GvSTASH(gv);
1236 sv_setpv(sv, prefix ? prefix : "");
1238 name = HvNAME_get(hv);
1242 if (keepmain || strNE(name, "main")) {
1244 sv_catpvn(sv,"::", 2);
1246 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1250 Perl_gv_efullname4(pTHX_ SV *sv, GV *gv, const char *prefix, bool keepmain)
1252 const GV * const egv = GvEGV(gv);
1253 gv_fullname4(sv, (GV *) (egv ? egv : gv), prefix, keepmain);
1260 IO * const io = (IO*)NEWSV(0,0);
1262 sv_upgrade((SV *)io,SVt_PVIO);
1263 /* This used to read SvREFCNT(io) = 1;
1264 It's not clear why the reference count needed an explicit reset. NWC
1266 assert (SvREFCNT(io) == 1);
1268 /* Clear the stashcache because a new IO could overrule a package name */
1269 hv_clear(PL_stashcache);
1270 iogv = gv_fetchpvn_flags("FileHandle::", 12, 0, SVt_PVHV);
1271 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1272 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1273 iogv = gv_fetchpvn_flags("IO::Handle::", 12, TRUE, SVt_PVHV);
1274 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1279 Perl_gv_check(pTHX_ HV *stash)
1283 if (!HvARRAY(stash))
1285 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1287 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1290 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1291 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1293 if (hv != PL_defstash && hv != stash)
1294 gv_check(hv); /* nested package */
1296 else if (isALPHA(*HeKEY(entry))) {
1298 gv = (GV*)HeVAL(entry);
1299 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1302 /* performance hack: if filename is absolute and it's a standard
1303 * module, don't bother warning */
1304 #ifdef MACOS_TRADITIONAL
1305 # define LIB_COMPONENT ":lib:"
1307 # define LIB_COMPONENT "/lib/"
1310 && PERL_FILE_IS_ABSOLUTE(file)
1311 && (instr(file, LIB_COMPONENT) || instr(file, ".pm")))
1315 CopLINE_set(PL_curcop, GvLINE(gv));
1317 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1319 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1321 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1322 "Name \"%s::%s\" used only once: possible typo",
1323 HvNAME_get(stash), GvNAME(gv));
1330 Perl_newGVgen(pTHX_ char *pack)
1332 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1336 /* hopefully this is only called on local symbol table entries */
1339 Perl_gp_ref(pTHX_ GP *gp)
1346 /* multi-named GPs cannot be used for method cache */
1347 SvREFCNT_dec(gp->gp_cv);
1352 /* Adding a new name to a subroutine invalidates method cache */
1353 PL_sub_generation++;
1360 Perl_gp_free(pTHX_ GV *gv)
1364 if (!gv || !(gp = GvGP(gv)))
1366 if (gp->gp_refcnt == 0) {
1367 if (ckWARN_d(WARN_INTERNAL))
1368 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1369 "Attempt to free unreferenced glob pointers"
1370 pTHX__FORMAT pTHX__VALUE);
1374 /* Deleting the name of a subroutine invalidates method cache */
1375 PL_sub_generation++;
1377 if (--gp->gp_refcnt > 0) {
1378 if (gp->gp_egv == gv)
1383 if (gp->gp_sv) SvREFCNT_dec(gp->gp_sv);
1384 if (gp->gp_av) SvREFCNT_dec(gp->gp_av);
1385 /* FIXME - another reference loop GV -> symtab -> GV ?
1386 Somehow gp->gp_hv can end up pointing at freed garbage. */
1387 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1388 /* FIXME strlen HvNAME */
1389 const char *hvname = HvNAME_get(gp->gp_hv);
1390 if (PL_stashcache && hvname)
1391 hv_delete(PL_stashcache, hvname, strlen(hvname), G_DISCARD);
1392 SvREFCNT_dec(gp->gp_hv);
1394 if (gp->gp_io) SvREFCNT_dec(gp->gp_io);
1395 if (gp->gp_cv) SvREFCNT_dec(gp->gp_cv);
1396 if (gp->gp_form) SvREFCNT_dec(gp->gp_form);
1403 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1405 AMT * const amtp = (AMT*)mg->mg_ptr;
1406 PERL_UNUSED_ARG(sv);
1408 if (amtp && AMT_AMAGIC(amtp)) {
1410 for (i = 1; i < NofAMmeth; i++) {
1411 CV * const cv = amtp->table[i];
1413 SvREFCNT_dec((SV *) cv);
1414 amtp->table[i] = Nullcv;
1421 /* Updates and caches the CV's */
1424 Perl_Gv_AMupdate(pTHX_ HV *stash)
1426 MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1427 AMT * const amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
1430 if (mg && amtp->was_ok_am == PL_amagic_generation
1431 && amtp->was_ok_sub == PL_sub_generation)
1432 return (bool)AMT_OVERLOADED(amtp);
1433 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1435 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1438 amt.was_ok_am = PL_amagic_generation;
1439 amt.was_ok_sub = PL_sub_generation;
1440 amt.fallback = AMGfallNO;
1444 int filled = 0, have_ovl = 0;
1447 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1449 /* Try to find via inheritance. */
1450 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1451 SV * const sv = gv ? GvSV(gv) : NULL;
1455 lim = DESTROY_amg; /* Skip overloading entries. */
1456 #ifdef PERL_DONT_CREATE_GVSV
1458 /* Equivalent to !SvTRUE and !SvOK */
1461 else if (SvTRUE(sv))
1462 amt.fallback=AMGfallYES;
1464 amt.fallback=AMGfallNEVER;
1466 for (i = 1; i < lim; i++)
1467 amt.table[i] = Nullcv;
1468 for (; i < NofAMmeth; i++) {
1469 const char *cooky = PL_AMG_names[i];
1470 /* Human-readable form, for debugging: */
1471 const char *cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1472 const STRLEN l = strlen(cooky);
1474 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1475 cp, HvNAME_get(stash)) );
1476 /* don't fill the cache while looking up!
1477 Creation of inheritance stubs in intermediate packages may
1478 conflict with the logic of runtime method substitution.
1479 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1480 then we could have created stubs for "(+0" in A and C too.
1481 But if B overloads "bool", we may want to use it for
1482 numifying instead of C's "+0". */
1483 if (i >= DESTROY_amg)
1484 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1485 else /* Autoload taken care of below */
1486 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1488 if (gv && (cv = GvCV(gv))) {
1490 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1491 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1492 /* This is a hack to support autoloading..., while
1493 knowing *which* methods were declared as overloaded. */
1494 /* GvSV contains the name of the method. */
1496 SV *gvsv = GvSV(gv);
1498 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1499 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1500 GvSV(gv), cp, hvname) );
1501 if (!gvsv || !SvPOK(gvsv)
1502 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1505 /* Can be an import stub (created by "can"). */
1506 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1507 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1508 "in package \"%.256s\"",
1509 (GvCVGEN(gv) ? "Stub found while resolving"
1513 cv = GvCV(gv = ngv);
1515 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1516 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1517 GvNAME(CvGV(cv))) );
1519 if (i < DESTROY_amg)
1521 } else if (gv) { /* Autoloaded... */
1525 amt.table[i]=(CV*)SvREFCNT_inc_simple(cv);
1528 AMT_AMAGIC_on(&amt);
1530 AMT_OVERLOADED_on(&amt);
1531 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1532 (char*)&amt, sizeof(AMT));
1536 /* Here we have no table: */
1538 AMT_AMAGIC_off(&amt);
1539 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1540 (char*)&amt, sizeof(AMTS));
1546 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1551 if (!stash || !HvNAME_get(stash))
1553 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1557 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1559 amtp = (AMT*)mg->mg_ptr;
1560 if ( amtp->was_ok_am != PL_amagic_generation
1561 || amtp->was_ok_sub != PL_sub_generation )
1563 if (AMT_AMAGIC(amtp)) {
1564 CV * const ret = amtp->table[id];
1565 if (ret && isGV(ret)) { /* Autoloading stab */
1566 /* Passing it through may have resulted in a warning
1567 "Inherited AUTOLOAD for a non-method deprecated", since
1568 our caller is going through a function call, not a method call.
1569 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1570 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1583 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1587 CV **cvp=NULL, **ocvp=NULL;
1588 AMT *amtp=NULL, *oamtp=NULL;
1589 int off = 0, off1, lr = 0, notfound = 0;
1590 int postpr = 0, force_cpy = 0;
1591 int assign = AMGf_assign & flags;
1592 const int assignshift = assign ? 1 : 0;
1597 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1598 && (stash = SvSTASH(SvRV(left)))
1599 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1600 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1601 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1603 && ((cv = cvp[off=method+assignshift])
1604 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1610 cv = cvp[off=method])))) {
1611 lr = -1; /* Call method for left argument */
1613 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1616 /* look for substituted methods */
1617 /* In all the covered cases we should be called with assign==0. */
1621 if ((cv = cvp[off=add_ass_amg])
1622 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1623 right = &PL_sv_yes; lr = -1; assign = 1;
1628 if ((cv = cvp[off = subtr_ass_amg])
1629 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1630 right = &PL_sv_yes; lr = -1; assign = 1;
1634 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1637 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1640 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1643 (void)((cv = cvp[off=bool__amg])
1644 || (cv = cvp[off=numer_amg])
1645 || (cv = cvp[off=string_amg]));
1651 * SV* ref causes confusion with the interpreter variable of
1654 SV* const tmpRef=SvRV(left);
1655 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1657 * Just to be extra cautious. Maybe in some
1658 * additional cases sv_setsv is safe, too.
1660 SV* const newref = newSVsv(tmpRef);
1661 SvOBJECT_on(newref);
1662 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1668 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1669 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1670 SV* const nullsv=sv_2mortal(newSViv(0));
1672 SV* const lessp = amagic_call(left,nullsv,
1673 lt_amg,AMGf_noright);
1674 logic = SvTRUE(lessp);
1676 SV* const lessp = amagic_call(left,nullsv,
1677 ncmp_amg,AMGf_noright);
1678 logic = (SvNV(lessp) < 0);
1681 if (off==subtr_amg) {
1692 if ((cv = cvp[off=subtr_amg])) {
1694 left = sv_2mortal(newSViv(0));
1699 case iter_amg: /* XXXX Eventually should do to_gv. */
1701 return NULL; /* Delegate operation to standard mechanisms. */
1709 return left; /* Delegate operation to standard mechanisms. */
1714 if (!cv) goto not_found;
1715 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1716 && (stash = SvSTASH(SvRV(right)))
1717 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1718 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1719 ? (amtp = (AMT*)mg->mg_ptr)->table
1721 && (cv = cvp[off=method])) { /* Method for right
1724 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1725 && (cvp=ocvp) && (lr = -1))
1726 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1727 && !(flags & AMGf_unary)) {
1728 /* We look for substitution for
1729 * comparison operations and
1731 if (method==concat_amg || method==concat_ass_amg
1732 || method==repeat_amg || method==repeat_ass_amg) {
1733 return NULL; /* Delegate operation to string conversion */
1743 postpr = 1; off=ncmp_amg; break;
1750 postpr = 1; off=scmp_amg; break;
1752 if (off != -1) cv = cvp[off];
1757 not_found: /* No method found, either report or croak */
1765 return left; /* Delegate operation to standard mechanisms. */
1768 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1769 notfound = 1; lr = -1;
1770 } else if (cvp && (cv=cvp[nomethod_amg])) {
1771 notfound = 1; lr = 1;
1774 if (off==-1) off=method;
1775 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1776 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1777 AMG_id2name(method + assignshift),
1778 (flags & AMGf_unary ? " " : "\n\tleft "),
1780 "in overloaded package ":
1781 "has no overloaded magic",
1783 HvNAME_get(SvSTASH(SvRV(left))):
1786 ",\n\tright argument in overloaded package ":
1789 : ",\n\tright argument has no overloaded magic"),
1791 HvNAME_get(SvSTASH(SvRV(right))):
1793 if (amtp && amtp->fallback >= AMGfallYES) {
1794 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1796 Perl_croak(aTHX_ "%"SVf, msg);
1800 force_cpy = force_cpy || assign;
1805 DEBUG_o(Perl_deb(aTHX_
1806 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1808 method+assignshift==off? "" :
1810 method+assignshift==off? "" :
1811 AMG_id2name(method+assignshift),
1812 method+assignshift==off? "" : "\")",
1813 flags & AMGf_unary? "" :
1814 lr==1 ? " for right argument": " for left argument",
1815 flags & AMGf_unary? " for argument" : "",
1816 stash ? HvNAME_get(stash) : "null",
1817 fl? ",\n\tassignment variant used": "") );
1820 /* Since we use shallow copy during assignment, we need
1821 * to dublicate the contents, probably calling user-supplied
1822 * version of copy operator
1824 /* We need to copy in following cases:
1825 * a) Assignment form was called.
1826 * assignshift==1, assign==T, method + 1 == off
1827 * b) Increment or decrement, called directly.
1828 * assignshift==0, assign==0, method + 0 == off
1829 * c) Increment or decrement, translated to assignment add/subtr.
1830 * assignshift==0, assign==T,
1832 * d) Increment or decrement, translated to nomethod.
1833 * assignshift==0, assign==0,
1835 * e) Assignment form translated to nomethod.
1836 * assignshift==1, assign==T, method + 1 != off
1839 /* off is method, method+assignshift, or a result of opcode substitution.
1840 * In the latter case assignshift==0, so only notfound case is important.
1842 if (( (method + assignshift == off)
1843 && (assign || (method == inc_amg) || (method == dec_amg)))
1850 const bool oldcatch = CATCH_GET;
1853 Zero(&myop, 1, BINOP);
1854 myop.op_last = (OP *) &myop;
1855 myop.op_next = NULL;
1856 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1858 PUSHSTACKi(PERLSI_OVERLOAD);
1861 PL_op = (OP *) &myop;
1862 if (PERLDB_SUB && PL_curstash != PL_debstash)
1863 PL_op->op_private |= OPpENTERSUB_DB;
1867 EXTEND(SP, notfound + 5);
1868 PUSHs(lr>0? right: left);
1869 PUSHs(lr>0? left: right);
1870 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1872 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1877 if ((PL_op = Perl_pp_entersub(aTHX)))
1885 CATCH_SET(oldcatch);
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 ans=SvIV(res)==0; break;
1907 ans=SvIV(res)!=0; break;
1910 SvSetSV(left,res); return left;
1912 ans=!SvTRUE(res); break;
1917 } else if (method==copy_amg) {
1919 Perl_croak(aTHX_ "Copy method did not return a reference");
1921 return SvREFCNT_inc(SvRV(res));
1929 =for apidoc is_gv_magical
1931 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
1937 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
1940 char *temp = SvPV(name, len);
1941 return is_gv_magical(temp, len, flags);
1945 =for apidoc is_gv_magical
1947 Returns C<TRUE> if given the name of a magical GV.
1949 Currently only useful internally when determining if a GV should be
1950 created even in rvalue contexts.
1952 C<flags> is not used at present but available for future extension to
1953 allow selecting particular classes of magical variable.
1955 Currently assumes that C<name> is NUL terminated (as well as len being valid).
1956 This assumption is met by all callers within the perl core, which all pass
1957 pointers returned by SvPV.
1962 Perl_is_gv_magical(pTHX_ char *name, STRLEN len, U32 flags)
1964 PERL_UNUSED_ARG(flags);
1967 const char * const name1 = name + 1;
1970 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
1974 if (len == 8 && strEQ(name1, "VERLOAD"))
1978 if (len == 3 && name[1] == 'I' && name[2] == 'G')
1981 /* Using ${^...} variables is likely to be sufficiently rare that
1982 it seems sensible to avoid the space hit of also checking the
1984 case '\017': /* ${^OPEN} */
1985 if (strEQ(name1, "PEN"))
1988 case '\024': /* ${^TAINT} */
1989 if (strEQ(name1, "AINT"))
1992 case '\025': /* ${^UNICODE} */
1993 if (strEQ(name1, "NICODE"))
1995 if (strEQ(name1, "TF8LOCALE"))
1998 case '\027': /* ${^WARNING_BITS} */
1999 if (strEQ(name1, "ARNING_BITS"))
2012 const char *end = name + len;
2013 while (--end > name) {
2021 /* Because we're already assuming that name is NUL terminated
2022 below, we can treat an empty name as "\0" */
2050 case '\001': /* $^A */
2051 case '\003': /* $^C */
2052 case '\004': /* $^D */
2053 case '\005': /* $^E */
2054 case '\006': /* $^F */
2055 case '\010': /* $^H */
2056 case '\011': /* $^I, NOT \t in EBCDIC */
2057 case '\014': /* $^L */
2058 case '\016': /* $^N */
2059 case '\017': /* $^O */
2060 case '\020': /* $^P */
2061 case '\023': /* $^S */
2062 case '\024': /* $^T */
2063 case '\026': /* $^V */
2064 case '\027': /* $^W */
2085 * c-indentation-style: bsd
2087 * indent-tabs-mode: t
2090 * ex: set ts=8 sts=4 sw=4 noet: