3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 * 2000, 2001, 2002, 2003, 2004, 2005, 2006, by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
12 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
13 * of your inquisitiveness, I shall spend all the rest of my days answering
14 * you. What more do you want to know?'
15 * 'The names of all the stars, and of all living things, and the whole
16 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
23 A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
24 It is a structure that holds a pointer to a scalar, an array, a hash etc,
25 corresponding to $foo, @foo, %foo.
27 GVs are usually found as values in stashes (symbol table hashes) where
28 Perl stores its global variables.
37 static const char S_autoload[] = "AUTOLOAD";
38 static const STRLEN S_autolen = sizeof(S_autoload)-1;
41 #ifdef PERL_DONT_CREATE_GVSV
43 Perl_gv_SVadd(pTHX_ GV *gv)
45 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
46 Perl_croak(aTHX_ "Bad symbol for scalar");
54 Perl_gv_AVadd(pTHX_ register GV *gv)
56 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
57 Perl_croak(aTHX_ "Bad symbol for array");
64 Perl_gv_HVadd(pTHX_ register GV *gv)
66 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
67 Perl_croak(aTHX_ "Bad symbol for hash");
74 Perl_gv_IOadd(pTHX_ register GV *gv)
77 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) {
80 * if it walks like a dirhandle, then let's assume that
81 * this is a dirhandle.
83 const char *fh = PL_op->op_type == OP_READDIR ||
84 PL_op->op_type == OP_TELLDIR ||
85 PL_op->op_type == OP_SEEKDIR ||
86 PL_op->op_type == OP_REWINDDIR ||
87 PL_op->op_type == OP_CLOSEDIR ?
88 "dirhandle" : "filehandle";
89 Perl_croak(aTHX_ "Bad symbol for %s", fh);
93 #ifdef GV_UNIQUE_CHECK
95 Perl_croak(aTHX_ "Bad symbol for filehandle (GV is unique)");
104 Perl_gv_fetchfile(pTHX_ const char *name)
115 tmplen = strlen(name) + 2;
116 if (tmplen < sizeof smallbuf)
119 Newx(tmpbuf, tmplen + 1, char);
120 /* This is where the debugger's %{"::_<$filename"} hash is created */
123 memcpy(tmpbuf + 2, name, tmplen - 1);
124 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
126 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
127 #ifdef PERL_DONT_CREATE_GVSV
128 GvSV(gv) = newSVpvn(name, tmplen - 2);
130 sv_setpvn(GvSV(gv), name, tmplen - 2);
133 hv_magic(GvHVn(gv_AVadd(gv)), Nullgv, PERL_MAGIC_dbfile);
135 if (tmpbuf != smallbuf)
141 =for apidoc gv_const_sv
143 If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
144 inlining, or C<gv> is a placeholder reference that would be promoted to such
145 a typeglob, then returns the value returned by the sub. Otherwise, returns
152 Perl_gv_const_sv(pTHX_ GV *gv)
154 if (SvTYPE(gv) == SVt_PVGV)
155 return cv_const_sv(GvCVu(gv));
156 return SvROK(gv) ? SvRV(gv) : NULL;
160 Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
164 const bool doproto = SvTYPE(gv) > SVt_NULL;
165 const char * const proto = (doproto && SvPOK(gv)) ? SvPVX_const(gv) : NULL;
166 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
168 assert (!(proto && has_constant));
171 /* The constant has to be a simple scalar type. */
172 switch (SvTYPE(has_constant)) {
178 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
179 sv_reftype(has_constant, 0));
185 sv_upgrade((SV*)gv, SVt_PVGV);
192 Safefree(SvPVX_mutable(gv));
195 GvGP(gv) = gp_ref(gp);
196 #ifdef PERL_DONT_CREATE_GVSV
201 GvLINE(gv) = CopLINE(PL_curcop);
202 /* XXX Ideally this cast would be replaced with a change to const char*
204 GvFILE(gv) = CopFILE(PL_curcop) ? CopFILE(PL_curcop) : (char *) "";
207 sv_magic((SV*)gv, (SV*)gv, PERL_MAGIC_glob, Nullch, 0);
210 Perl_sv_add_backref(aTHX_ (SV*)stash, (SV*)gv);
211 GvNAME(gv) = savepvn(name, len);
213 if (multi || doproto) /* doproto means it _was_ mentioned */
215 if (doproto) { /* Replicate part of newSUB here. */
219 /* newCONSTSUB takes ownership of the reference from us. */
220 GvCV(gv) = newCONSTSUB(stash, name, has_constant);
222 /* XXX unsafe for threads if eval_owner isn't held */
223 (void) start_subparse(0,0); /* Create empty CV in compcv. */
224 GvCV(gv) = PL_compcv;
230 CvFILE_set_from_cop(GvCV(gv), PL_curcop);
231 CvSTASH(GvCV(gv)) = PL_curstash;
233 sv_setpv((SV*)GvCV(gv), proto);
240 S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
252 #ifdef PERL_DONT_CREATE_GVSV
265 =for apidoc gv_fetchmeth
267 Returns the glob with the given C<name> and a defined subroutine or
268 C<NULL>. The glob lives in the given C<stash>, or in the stashes
269 accessible via @ISA and UNIVERSAL::.
271 The argument C<level> should be either 0 or -1. If C<level==0>, as a
272 side-effect creates a glob with the given C<name> in the given C<stash>
273 which in the case of success contains an alias for the subroutine, and sets
274 up caching info for this glob. Similarly for all the searched stashes.
276 This function grants C<"SUPER"> token as a postfix of the stash name. The
277 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
278 visible to Perl code. So when calling C<call_sv>, you should not use
279 the GV directly; instead, you should use the method's CV, which can be
280 obtained from the GV with the C<GvCV> macro.
286 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
296 /* UNIVERSAL methods should be callable without a stash */
298 level = -1; /* probably appropriate */
299 if(!(stash = gv_stashpvs("UNIVERSAL", FALSE)))
303 hvname = HvNAME_get(stash);
306 "Can't use anonymous symbol table for method lookup");
308 if ((level > 100) || (level < -100))
309 Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
312 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
314 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
319 if (SvTYPE(topgv) != SVt_PVGV)
320 gv_init(topgv, stash, name, len, TRUE);
321 if ((cv = GvCV(topgv))) {
322 /* If genuine method or valid cache entry, use it */
323 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
325 /* Stale cached entry: junk it */
327 GvCV(topgv) = cv = Nullcv;
330 else if (GvCVGEN(topgv) == PL_sub_generation)
331 return 0; /* cache indicates sub doesn't exist */
334 gvp = (GV**)hv_fetchs(stash, "ISA", FALSE);
335 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : NULL;
337 /* create and re-create @.*::SUPER::ISA on demand */
338 if (!av || !SvMAGIC(av)) {
339 STRLEN packlen = HvNAMELEN_get(stash);
341 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
345 basestash = gv_stashpvn(hvname, packlen, TRUE);
346 gvp = (GV**)hv_fetchs(basestash, "ISA", FALSE);
347 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
348 gvp = (GV**)hv_fetchs(stash, "ISA", TRUE);
349 if (!gvp || !(gv = *gvp))
350 Perl_croak(aTHX_ "Cannot create %s::ISA", hvname);
351 if (SvTYPE(gv) != SVt_PVGV)
352 gv_init(gv, stash, "ISA", 3, TRUE);
353 SvREFCNT_dec(GvAV(gv));
354 GvAV(gv) = (AV*)SvREFCNT_inc(av);
360 SV** svp = AvARRAY(av);
361 /* NOTE: No support for tied ISA */
362 I32 items = AvFILLp(av) + 1;
364 SV* const sv = *svp++;
365 HV* const basestash = gv_stashsv(sv, FALSE);
367 if (ckWARN(WARN_MISC))
368 Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
372 gv = gv_fetchmeth(basestash, name, len,
373 (level >= 0) ? level + 1 : level - 1);
379 /* if at top level, try UNIVERSAL */
381 if (level == 0 || level == -1) {
382 HV* const lastchance = gv_stashpvs("UNIVERSAL", FALSE);
385 if ((gv = gv_fetchmeth(lastchance, name, len,
386 (level >= 0) ? level + 1 : level - 1)))
390 * Cache method in topgv if:
391 * 1. topgv has no synonyms (else inheritance crosses wires)
392 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
395 GvREFCNT(topgv) == 1 &&
397 (CvROOT(cv) || CvXSUB(cv)))
399 if ((cv = GvCV(topgv)))
401 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
402 GvCVGEN(topgv) = PL_sub_generation;
406 else if (topgv && GvREFCNT(topgv) == 1) {
407 /* cache the fact that the method is not defined */
408 GvCVGEN(topgv) = PL_sub_generation;
417 =for apidoc gv_fetchmeth_autoload
419 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
420 Returns a glob for the subroutine.
422 For an autoloaded subroutine without a GV, will create a GV even
423 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
424 of the result may be zero.
430 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
432 GV *gv = gv_fetchmeth(stash, name, len, level);
439 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
440 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
442 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
445 if (!(CvROOT(cv) || CvXSUB(cv)))
447 /* Have an autoload */
448 if (level < 0) /* Cannot do without a stub */
449 gv_fetchmeth(stash, name, len, 0);
450 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
459 =for apidoc gv_fetchmethod_autoload
461 Returns the glob which contains the subroutine to call to invoke the method
462 on the C<stash>. In fact in the presence of autoloading this may be the
463 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
466 The third parameter of C<gv_fetchmethod_autoload> determines whether
467 AUTOLOAD lookup is performed if the given method is not present: non-zero
468 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
469 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
470 with a non-zero C<autoload> parameter.
472 These functions grant C<"SUPER"> token as a prefix of the method name. Note
473 that if you want to keep the returned glob for a long time, you need to
474 check for it being "AUTOLOAD", since at the later time the call may load a
475 different subroutine due to $AUTOLOAD changing its value. Use the glob
476 created via a side effect to do this.
478 These functions have the same side-effects and as C<gv_fetchmeth> with
479 C<level==0>. C<name> should be writable if contains C<':'> or C<'
480 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
481 C<call_sv> apply equally to these functions.
487 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
490 register const char *nend;
491 const char *nsplit = NULL;
495 if (stash && SvTYPE(stash) < SVt_PVHV)
498 for (nend = name; *nend; nend++) {
501 else if (*nend == ':' && *(nend + 1) == ':')
505 const char * const origname = name;
509 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
510 /* ->SUPER::method should really be looked up in original stash */
511 SV *tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
512 CopSTASHPV(PL_curcop)));
513 /* __PACKAGE__::SUPER stash should be autovivified */
514 stash = gv_stashpvn(SvPVX_const(tmpstr), SvCUR(tmpstr), TRUE);
515 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
516 origname, HvNAME_get(stash), name) );
519 /* don't autovifify if ->NoSuchStash::method */
520 stash = gv_stashpvn(origname, nsplit - origname, FALSE);
522 /* however, explicit calls to Pkg::SUPER::method may
523 happen, and may require autovivification to work */
524 if (!stash && (nsplit - origname) >= 7 &&
525 strnEQ(nsplit - 7, "::SUPER", 7) &&
526 gv_stashpvn(origname, nsplit - origname - 7, FALSE))
527 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
532 gv = gv_fetchmeth(stash, name, nend - name, 0);
534 if (strEQ(name,"import") || strEQ(name,"unimport"))
535 gv = (GV*)&PL_sv_yes;
537 gv = gv_autoload4(ostash, name, nend - name, TRUE);
540 CV* const cv = GvCV(gv);
541 if (!CvROOT(cv) && !CvXSUB(cv)) {
549 if (GvCV(stubgv) != cv) /* orphaned import */
552 autogv = gv_autoload4(GvSTASH(stubgv),
553 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
563 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
571 const char *packname = "";
574 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
577 if (SvTYPE(stash) < SVt_PVHV) {
578 packname = SvPV_const((SV*)stash, packname_len);
582 packname = HvNAME_get(stash);
583 packname_len = HvNAMELEN_get(stash);
586 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
590 if (!(CvROOT(cv) || CvXSUB(cv)))
594 * Inheriting AUTOLOAD for non-methods works ... for now.
596 if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
597 && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)
599 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
600 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
601 packname, (int)len, name);
604 /* rather than lookup/init $AUTOLOAD here
605 * only to have the XSUB do another lookup for $AUTOLOAD
606 * and split that value on the last '::',
607 * pass along the same data via some unused fields in the CV
610 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
616 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
617 * The subroutine's original name may not be "AUTOLOAD", so we don't
618 * use that, but for lack of anything better we will use the sub's
619 * original package to look up $AUTOLOAD.
621 varstash = GvSTASH(CvGV(cv));
622 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
626 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
627 #ifdef PERL_DONT_CREATE_GVSV
628 GvSV(vargv) = newSV(0);
632 varsv = GvSVn(vargv);
633 sv_setpvn(varsv, packname, packname_len);
634 sv_catpvs(varsv, "::");
635 sv_catpvn(varsv, name, len);
636 SvTAINTED_off(varsv);
640 /* The "gv" parameter should be the glob known to Perl code as *!
641 * The scalar must already have been magicalized.
644 S_require_errno(pTHX_ GV *gv)
647 HV* stash = gv_stashpvs("Errno", FALSE);
649 if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
653 save_scalar(gv); /* keep the value of $! */
654 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
655 newSVpvs("Errno"), Nullsv);
658 stash = gv_stashpvs("Errno", FALSE);
659 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
660 Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available");
665 =for apidoc gv_stashpv
667 Returns a pointer to the stash for a specified package. C<name> should
668 be a valid UTF-8 string and must be null-terminated. If C<create> is set
669 then the package will be created if it does not already exist. If C<create>
670 is not set and the package does not exist then NULL is returned.
676 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
678 return gv_stashpvn(name, strlen(name), create);
682 =for apidoc gv_stashpvn
684 Returns a pointer to the stash for a specified package. C<name> should
685 be a valid UTF-8 string. The C<namelen> parameter indicates the length of
686 the C<name>, in bytes. If C<create> is set then the package will be
687 created if it does not already exist. If C<create> is not set and the
688 package does not exist then NULL is returned.
694 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
701 if (namelen + 3 < sizeof smallbuf)
704 Newx(tmpbuf, namelen + 3, char);
705 Copy(name,tmpbuf,namelen,char);
706 tmpbuf[namelen++] = ':';
707 tmpbuf[namelen++] = ':';
708 tmpbuf[namelen] = '\0';
709 tmpgv = gv_fetchpvn_flags(tmpbuf, namelen, create, SVt_PVHV);
710 if (tmpbuf != smallbuf)
715 GvHV(tmpgv) = newHV();
717 if (!HvNAME_get(stash))
718 hv_name_set(stash, name, namelen, 0);
723 =for apidoc gv_stashsv
725 Returns a pointer to the stash for a specified package, which must be a
726 valid UTF-8 string. See C<gv_stashpv>.
732 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
735 const char * const ptr = SvPV_const(sv,len);
736 return gv_stashpvn(ptr, len, create);
741 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
742 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
746 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
748 const char * const nambeg = SvPV_const(name, len);
749 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
753 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
757 register const char *name = nambeg;
758 register GV *gv = NULL;
761 register const char *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 (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
772 for (name_cursor = name; name_cursor < name_end; name_cursor++) {
773 if ((*name_cursor == ':' && name_cursor < name_em1
774 && name_cursor[1] == ':')
775 || (*name_cursor == '\'' && name_cursor[1]))
779 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
782 len = name_cursor - name;
787 if (len + 3 < sizeof (smallbuf))
790 Newx(tmpbuf, len+3, char);
791 Copy(name, tmpbuf, len, char);
795 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
796 gv = gvp ? *gvp : Nullgv;
797 if (gv && gv != (GV*)&PL_sv_undef) {
798 if (SvTYPE(gv) != SVt_PVGV)
799 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
803 if (tmpbuf != smallbuf)
805 if (!gv || gv == (GV*)&PL_sv_undef)
808 if (!(stash = GvHV(gv)))
809 stash = GvHV(gv) = newHV();
811 if (!HvNAME_get(stash))
812 hv_name_set(stash, nambeg, name_cursor - nambeg, 0);
815 if (*name_cursor == ':')
819 if (name == name_end)
820 return gv ? gv : (GV*)*hv_fetchs(PL_defstash, "main::", TRUE);
823 len = name_cursor - name;
825 /* No stash in name, so see how we can default */
828 if (len && isIDFIRST_lazy(name)) {
837 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
838 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
839 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
843 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
848 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
849 && name[3] == 'I' && name[4] == 'N')
853 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
854 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
855 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
859 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
860 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
868 else if (IN_PERL_COMPILETIME) {
870 if (add && (PL_hints & HINT_STRICT_VARS) &&
871 sv_type != SVt_PVCV &&
872 sv_type != SVt_PVGV &&
873 sv_type != SVt_PVFM &&
874 sv_type != SVt_PVIO &&
875 !(len == 1 && sv_type == SVt_PV &&
876 (*name == 'a' || *name == 'b')) )
878 gvp = (GV**)hv_fetch(stash,name,len,0);
880 *gvp == (GV*)&PL_sv_undef ||
881 SvTYPE(*gvp) != SVt_PVGV)
885 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
886 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
887 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
889 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
890 sv_type == SVt_PVAV ? '@' :
891 sv_type == SVt_PVHV ? '%' : '$',
894 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
900 stash = CopSTASH(PL_curcop);
906 /* By this point we should have a stash and a name */
910 SV * const err = Perl_mess(aTHX_
911 "Global symbol \"%s%s\" requires explicit package name",
912 (sv_type == SVt_PV ? "$"
913 : sv_type == SVt_PVAV ? "@"
914 : sv_type == SVt_PVHV ? "%"
916 if (USE_UTF8_IN_NAMES)
919 stash = GvHV(gv_fetchpvn_flags("<none>::", 8, GV_ADDMULTI, SVt_PVHV));
925 if (!SvREFCNT(stash)) /* symbol table under destruction */
928 gvp = (GV**)hv_fetch(stash,name,len,add);
929 if (!gvp || *gvp == (GV*)&PL_sv_undef)
932 if (SvTYPE(gv) == SVt_PVGV) {
935 gv_init_sv(gv, sv_type);
936 if (*name=='!' && sv_type == SVt_PVHV && len==1)
940 } else if (no_init) {
942 } else if (no_expand && SvROK(gv)) {
946 /* Adding a new symbol */
948 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
949 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
950 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
951 gv_init_sv(gv, sv_type);
953 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
954 : (PL_dowarn & G_WARN_ON ) ) )
957 /* set up magic where warranted */
961 /* Nothing else to do.
962 The compiler will probably turn the switch statement into a
963 branch table. Make sure we avoid even that small overhead for
964 the common case of lower case variable names. */
968 const char * const name2 = name + 1;
971 if (strEQ(name2, "RGV")) {
972 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
976 if (strnEQ(name2, "XPORT", 5))
980 if (strEQ(name2, "SA")) {
981 AV* const av = GvAVn(gv);
983 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, Nullch, 0);
984 /* NOTE: No support for tied ISA */
985 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
986 && AvFILLp(av) == -1)
989 av_push(av, newSVpvn(pname = "NDBM_File",9));
990 gv_stashpvn(pname, 9, TRUE);
991 av_push(av, newSVpvn(pname = "DB_File",7));
992 gv_stashpvn(pname, 7, TRUE);
993 av_push(av, newSVpvn(pname = "GDBM_File",9));
994 gv_stashpvn(pname, 9, TRUE);
995 av_push(av, newSVpvn(pname = "SDBM_File",9));
996 gv_stashpvn(pname, 9, TRUE);
997 av_push(av, newSVpvn(pname = "ODBM_File",9));
998 gv_stashpvn(pname, 9, TRUE);
1003 if (strEQ(name2, "VERLOAD")) {
1004 HV* const hv = GvHVn(gv);
1006 hv_magic(hv, Nullgv, PERL_MAGIC_overload);
1010 if (strEQ(name2, "IG")) {
1014 Newxz(PL_psig_ptr, SIG_SIZE, SV*);
1015 Newxz(PL_psig_name, SIG_SIZE, SV*);
1016 Newxz(PL_psig_pend, SIG_SIZE, int);
1020 hv_magic(hv, Nullgv, PERL_MAGIC_sig);
1021 for (i = 1; i < SIG_SIZE; i++) {
1022 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
1024 sv_setsv(*init, &PL_sv_undef);
1026 PL_psig_name[i] = 0;
1027 PL_psig_pend[i] = 0;
1032 if (strEQ(name2, "ERSION"))
1035 case '\003': /* $^CHILD_ERROR_NATIVE */
1036 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1039 case '\005': /* $^ENCODING */
1040 if (strEQ(name2, "NCODING"))
1043 case '\017': /* $^OPEN */
1044 if (strEQ(name2, "PEN"))
1047 case '\024': /* ${^TAINT} */
1048 if (strEQ(name2, "AINT"))
1051 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1052 if (strEQ(name2, "NICODE"))
1054 if (strEQ(name2, "TF8LOCALE"))
1057 case '\027': /* $^WARNING_BITS */
1058 if (strEQ(name2, "ARNING_BITS"))
1071 /* ensures variable is only digits */
1072 /* ${"1foo"} fails this test (and is thus writeable) */
1073 /* added by japhy, but borrowed from is_gv_magical */
1074 const char *end = name + len;
1075 while (--end > name) {
1076 if (!isDIGIT(*end)) return gv;
1083 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1084 be case '\0' in this switch statement (ie a default case) */
1090 sv_type == SVt_PVAV ||
1091 sv_type == SVt_PVHV ||
1092 sv_type == SVt_PVCV ||
1093 sv_type == SVt_PVFM ||
1096 PL_sawampersand = TRUE;
1100 sv_setpv(GvSVn(gv),PL_chopset);
1104 #ifdef COMPLEX_STATUS
1105 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1111 /* If %! has been used, automatically load Errno.pm.
1112 The require will itself set errno, so in order to
1113 preserve its value we have to set up the magic
1114 now (rather than going to magicalize)
1117 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1119 if (sv_type == SVt_PVHV)
1125 AV* const av = GvAVn(gv);
1126 sv_magic((SV*)av, Nullsv, PERL_MAGIC_regdata, Nullch, 0);
1132 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1133 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1134 "$%c is no longer supported", *name);
1137 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1142 AV* const av = GvAVn(gv);
1143 sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, Nullch, 0);
1147 case '\023': /* $^S */
1158 SvREADONLY_on(GvSVn(gv));
1173 case '\001': /* $^A */
1174 case '\003': /* $^C */
1175 case '\004': /* $^D */
1176 case '\005': /* $^E */
1177 case '\006': /* $^F */
1178 case '\010': /* $^H */
1179 case '\011': /* $^I, NOT \t in EBCDIC */
1180 case '\016': /* $^N */
1181 case '\017': /* $^O */
1182 case '\020': /* $^P */
1183 case '\024': /* $^T */
1184 case '\027': /* $^W */
1186 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1189 case '\014': /* $^L */
1190 sv_setpvn(GvSVn(gv),"\f",1);
1191 PL_formfeed = GvSVn(gv);
1194 sv_setpvn(GvSVn(gv),"\034",1);
1198 SV * const sv = GvSVn(gv);
1199 if (!sv_derived_from(PL_patchlevel, "version"))
1200 upg_version(PL_patchlevel);
1201 GvSV(gv) = vnumify(PL_patchlevel);
1202 SvREADONLY_on(GvSV(gv));
1206 case '\026': /* $^V */
1208 SV * const sv = GvSVn(gv);
1209 GvSV(gv) = new_version(PL_patchlevel);
1210 SvREADONLY_on(GvSV(gv));
1220 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1224 const HV * const hv = GvSTASH(gv);
1229 sv_setpv(sv, prefix ? prefix : "");
1231 name = HvNAME_get(hv);
1233 namelen = HvNAMELEN_get(hv);
1239 if (keepmain || strNE(name, "main")) {
1240 sv_catpvn(sv,name,namelen);
1243 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1247 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1249 const GV * const egv = GvEGV(gv);
1250 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1258 IO * const io = (IO*)newSV(0);
1260 sv_upgrade((SV *)io,SVt_PVIO);
1261 /* This used to read SvREFCNT(io) = 1;
1262 It's not clear why the reference count needed an explicit reset. NWC
1264 assert (SvREFCNT(io) == 1);
1266 /* Clear the stashcache because a new IO could overrule a package name */
1267 hv_clear(PL_stashcache);
1268 iogv = gv_fetchpvn_flags("FileHandle::", 12, 0, SVt_PVHV);
1269 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1270 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1271 iogv = gv_fetchpvn_flags("IO::Handle::", 12, TRUE, SVt_PVHV);
1272 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1277 Perl_gv_check(pTHX_ HV *stash)
1282 if (!HvARRAY(stash))
1284 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1286 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1289 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1290 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1292 if (hv != PL_defstash && hv != stash)
1293 gv_check(hv); /* nested package */
1295 else if (isALPHA(*HeKEY(entry))) {
1297 gv = (GV*)HeVAL(entry);
1298 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1301 /* performance hack: if filename is absolute and it's a standard
1302 * module, don't bother warning */
1303 #ifdef MACOS_TRADITIONAL
1304 # define LIB_COMPONENT ":lib:"
1306 # define LIB_COMPONENT "/lib/"
1309 && PERL_FILE_IS_ABSOLUTE(file)
1310 && (instr(file, LIB_COMPONENT) || instr(file, ".pm")))
1314 CopLINE_set(PL_curcop, GvLINE(gv));
1316 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1318 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1320 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1321 "Name \"%s::%s\" used only once: possible typo",
1322 HvNAME_get(stash), GvNAME(gv));
1329 Perl_newGVgen(pTHX_ const 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)
1347 /* multi-named GPs cannot be used for method cache */
1348 SvREFCNT_dec(gp->gp_cv);
1353 /* Adding a new name to a subroutine invalidates method cache */
1354 PL_sub_generation++;
1361 Perl_gp_free(pTHX_ GV *gv)
1366 if (!gv || !(gp = GvGP(gv)))
1368 if (gp->gp_refcnt == 0) {
1369 if (ckWARN_d(WARN_INTERNAL))
1370 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1371 "Attempt to free unreferenced glob pointers"
1372 pTHX__FORMAT pTHX__VALUE);
1376 /* Deleting the name of a subroutine invalidates method cache */
1377 PL_sub_generation++;
1379 if (--gp->gp_refcnt > 0) {
1380 if (gp->gp_egv == gv)
1385 if (gp->gp_sv) SvREFCNT_dec(gp->gp_sv);
1386 if (gp->gp_av) SvREFCNT_dec(gp->gp_av);
1387 /* FIXME - another reference loop GV -> symtab -> GV ?
1388 Somehow gp->gp_hv can end up pointing at freed garbage. */
1389 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1390 const char *hvname = HvNAME_get(gp->gp_hv);
1391 if (PL_stashcache && hvname)
1392 hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv),
1394 SvREFCNT_dec(gp->gp_hv);
1396 if (gp->gp_io) SvREFCNT_dec(gp->gp_io);
1397 if (gp->gp_cv) SvREFCNT_dec(gp->gp_cv);
1398 if (gp->gp_form) SvREFCNT_dec(gp->gp_form);
1405 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1407 AMT * const amtp = (AMT*)mg->mg_ptr;
1408 PERL_UNUSED_ARG(sv);
1410 if (amtp && AMT_AMAGIC(amtp)) {
1412 for (i = 1; i < NofAMmeth; i++) {
1413 CV * const cv = amtp->table[i];
1415 SvREFCNT_dec((SV *) cv);
1416 amtp->table[i] = Nullcv;
1423 /* Updates and caches the CV's */
1426 Perl_Gv_AMupdate(pTHX_ HV *stash)
1429 MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1430 AMT * const amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
1433 if (mg && amtp->was_ok_am == PL_amagic_generation
1434 && amtp->was_ok_sub == PL_sub_generation)
1435 return (bool)AMT_OVERLOADED(amtp);
1436 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1438 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1441 amt.was_ok_am = PL_amagic_generation;
1442 amt.was_ok_sub = PL_sub_generation;
1443 amt.fallback = AMGfallNO;
1447 int filled = 0, have_ovl = 0;
1450 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1452 /* Try to find via inheritance. */
1453 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1454 SV * const sv = gv ? GvSV(gv) : NULL;
1458 lim = DESTROY_amg; /* Skip overloading entries. */
1459 #ifdef PERL_DONT_CREATE_GVSV
1461 /* Equivalent to !SvTRUE and !SvOK */
1464 else if (SvTRUE(sv))
1465 amt.fallback=AMGfallYES;
1467 amt.fallback=AMGfallNEVER;
1469 for (i = 1; i < lim; i++)
1470 amt.table[i] = Nullcv;
1471 for (; i < NofAMmeth; i++) {
1472 const char * const cooky = PL_AMG_names[i];
1473 /* Human-readable form, for debugging: */
1474 const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1475 const STRLEN l = strlen(cooky);
1477 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1478 cp, HvNAME_get(stash)) );
1479 /* don't fill the cache while looking up!
1480 Creation of inheritance stubs in intermediate packages may
1481 conflict with the logic of runtime method substitution.
1482 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1483 then we could have created stubs for "(+0" in A and C too.
1484 But if B overloads "bool", we may want to use it for
1485 numifying instead of C's "+0". */
1486 if (i >= DESTROY_amg)
1487 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1488 else /* Autoload taken care of below */
1489 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1491 if (gv && (cv = GvCV(gv))) {
1493 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1494 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1495 /* This is a hack to support autoloading..., while
1496 knowing *which* methods were declared as overloaded. */
1497 /* GvSV contains the name of the method. */
1499 SV *gvsv = GvSV(gv);
1501 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1502 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1503 GvSV(gv), cp, hvname) );
1504 if (!gvsv || !SvPOK(gvsv)
1505 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1508 /* Can be an import stub (created by "can"). */
1509 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1510 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1511 "in package \"%.256s\"",
1512 (GvCVGEN(gv) ? "Stub found while resolving"
1516 cv = GvCV(gv = ngv);
1518 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1519 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1520 GvNAME(CvGV(cv))) );
1522 if (i < DESTROY_amg)
1524 } else if (gv) { /* Autoloaded... */
1528 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1531 AMT_AMAGIC_on(&amt);
1533 AMT_OVERLOADED_on(&amt);
1534 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1535 (char*)&amt, sizeof(AMT));
1539 /* Here we have no table: */
1541 AMT_AMAGIC_off(&amt);
1542 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1543 (char*)&amt, sizeof(AMTS));
1549 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1555 if (!stash || !HvNAME_get(stash))
1557 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1561 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1563 amtp = (AMT*)mg->mg_ptr;
1564 if ( amtp->was_ok_am != PL_amagic_generation
1565 || amtp->was_ok_sub != PL_sub_generation )
1567 if (AMT_AMAGIC(amtp)) {
1568 CV * const ret = amtp->table[id];
1569 if (ret && isGV(ret)) { /* Autoloading stab */
1570 /* Passing it through may have resulted in a warning
1571 "Inherited AUTOLOAD for a non-method deprecated", since
1572 our caller is going through a function call, not a method call.
1573 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1574 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1587 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1592 CV **cvp=NULL, **ocvp=NULL;
1593 AMT *amtp=NULL, *oamtp=NULL;
1594 int off = 0, off1, lr = 0, notfound = 0;
1595 int postpr = 0, force_cpy = 0;
1596 int assign = AMGf_assign & flags;
1597 const int assignshift = assign ? 1 : 0;
1602 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1603 && (stash = SvSTASH(SvRV(left)))
1604 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1605 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1606 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1608 && ((cv = cvp[off=method+assignshift])
1609 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1615 cv = cvp[off=method])))) {
1616 lr = -1; /* Call method for left argument */
1618 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1621 /* look for substituted methods */
1622 /* In all the covered cases we should be called with assign==0. */
1626 if ((cv = cvp[off=add_ass_amg])
1627 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1628 right = &PL_sv_yes; lr = -1; assign = 1;
1633 if ((cv = cvp[off = subtr_ass_amg])
1634 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1635 right = &PL_sv_yes; lr = -1; assign = 1;
1639 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1642 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1645 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1648 (void)((cv = cvp[off=bool__amg])
1649 || (cv = cvp[off=numer_amg])
1650 || (cv = cvp[off=string_amg]));
1656 * SV* ref causes confusion with the interpreter variable of
1659 SV* const tmpRef=SvRV(left);
1660 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1662 * Just to be extra cautious. Maybe in some
1663 * additional cases sv_setsv is safe, too.
1665 SV* const newref = newSVsv(tmpRef);
1666 SvOBJECT_on(newref);
1667 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1673 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1674 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1675 SV* const nullsv=sv_2mortal(newSViv(0));
1677 SV* const lessp = amagic_call(left,nullsv,
1678 lt_amg,AMGf_noright);
1679 logic = SvTRUE(lessp);
1681 SV* const lessp = amagic_call(left,nullsv,
1682 ncmp_amg,AMGf_noright);
1683 logic = (SvNV(lessp) < 0);
1686 if (off==subtr_amg) {
1697 if ((cv = cvp[off=subtr_amg])) {
1699 left = sv_2mortal(newSViv(0));
1704 case iter_amg: /* XXXX Eventually should do to_gv. */
1706 return NULL; /* Delegate operation to standard mechanisms. */
1714 return left; /* Delegate operation to standard mechanisms. */
1719 if (!cv) goto not_found;
1720 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1721 && (stash = SvSTASH(SvRV(right)))
1722 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1723 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1724 ? (amtp = (AMT*)mg->mg_ptr)->table
1726 && (cv = cvp[off=method])) { /* Method for right
1729 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1730 && (cvp=ocvp) && (lr = -1))
1731 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1732 && !(flags & AMGf_unary)) {
1733 /* We look for substitution for
1734 * comparison operations and
1736 if (method==concat_amg || method==concat_ass_amg
1737 || method==repeat_amg || method==repeat_ass_amg) {
1738 return NULL; /* Delegate operation to string conversion */
1748 postpr = 1; off=ncmp_amg; break;
1755 postpr = 1; off=scmp_amg; break;
1757 if (off != -1) cv = cvp[off];
1762 not_found: /* No method found, either report or croak */
1770 return left; /* Delegate operation to standard mechanisms. */
1773 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1774 notfound = 1; lr = -1;
1775 } else if (cvp && (cv=cvp[nomethod_amg])) {
1776 notfound = 1; lr = 1;
1779 if (off==-1) off=method;
1780 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1781 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1782 AMG_id2name(method + assignshift),
1783 (flags & AMGf_unary ? " " : "\n\tleft "),
1785 "in overloaded package ":
1786 "has no overloaded magic",
1788 HvNAME_get(SvSTASH(SvRV(left))):
1791 ",\n\tright argument in overloaded package ":
1794 : ",\n\tright argument has no overloaded magic"),
1796 HvNAME_get(SvSTASH(SvRV(right))):
1798 if (amtp && amtp->fallback >= AMGfallYES) {
1799 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1801 Perl_croak(aTHX_ "%"SVf, msg);
1805 force_cpy = force_cpy || assign;
1810 DEBUG_o(Perl_deb(aTHX_
1811 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1813 method+assignshift==off? "" :
1815 method+assignshift==off? "" :
1816 AMG_id2name(method+assignshift),
1817 method+assignshift==off? "" : "\")",
1818 flags & AMGf_unary? "" :
1819 lr==1 ? " for right argument": " for left argument",
1820 flags & AMGf_unary? " for argument" : "",
1821 stash ? HvNAME_get(stash) : "null",
1822 fl? ",\n\tassignment variant used": "") );
1825 /* Since we use shallow copy during assignment, we need
1826 * to dublicate the contents, probably calling user-supplied
1827 * version of copy operator
1829 /* We need to copy in following cases:
1830 * a) Assignment form was called.
1831 * assignshift==1, assign==T, method + 1 == off
1832 * b) Increment or decrement, called directly.
1833 * assignshift==0, assign==0, method + 0 == off
1834 * c) Increment or decrement, translated to assignment add/subtr.
1835 * assignshift==0, assign==T,
1837 * d) Increment or decrement, translated to nomethod.
1838 * assignshift==0, assign==0,
1840 * e) Assignment form translated to nomethod.
1841 * assignshift==1, assign==T, method + 1 != off
1844 /* off is method, method+assignshift, or a result of opcode substitution.
1845 * In the latter case assignshift==0, so only notfound case is important.
1847 if (( (method + assignshift == off)
1848 && (assign || (method == inc_amg) || (method == dec_amg)))
1855 const bool oldcatch = CATCH_GET;
1858 Zero(&myop, 1, BINOP);
1859 myop.op_last = (OP *) &myop;
1860 myop.op_next = Nullop;
1861 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1863 PUSHSTACKi(PERLSI_OVERLOAD);
1866 PL_op = (OP *) &myop;
1867 if (PERLDB_SUB && PL_curstash != PL_debstash)
1868 PL_op->op_private |= OPpENTERSUB_DB;
1872 EXTEND(SP, notfound + 5);
1873 PUSHs(lr>0? right: left);
1874 PUSHs(lr>0? left: right);
1875 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1877 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1882 if ((PL_op = Perl_pp_entersub(aTHX)))
1890 CATCH_SET(oldcatch);
1897 ans=SvIV(res)<=0; break;
1900 ans=SvIV(res)<0; break;
1903 ans=SvIV(res)>=0; break;
1906 ans=SvIV(res)>0; break;
1909 ans=SvIV(res)==0; break;
1912 ans=SvIV(res)!=0; break;
1915 SvSetSV(left,res); return left;
1917 ans=!SvTRUE(res); break;
1922 } else if (method==copy_amg) {
1924 Perl_croak(aTHX_ "Copy method did not return a reference");
1926 return SvREFCNT_inc(SvRV(res));
1934 =for apidoc is_gv_magical_sv
1936 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
1942 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
1945 const char * const temp = SvPV_const(name, len);
1946 return is_gv_magical(temp, len, flags);
1950 =for apidoc is_gv_magical
1952 Returns C<TRUE> if given the name of a magical GV.
1954 Currently only useful internally when determining if a GV should be
1955 created even in rvalue contexts.
1957 C<flags> is not used at present but available for future extension to
1958 allow selecting particular classes of magical variable.
1960 Currently assumes that C<name> is NUL terminated (as well as len being valid).
1961 This assumption is met by all callers within the perl core, which all pass
1962 pointers returned by SvPV.
1967 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
1969 PERL_UNUSED_ARG(flags);
1972 const char * const name1 = name + 1;
1975 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
1979 if (len == 8 && strEQ(name1, "VERLOAD"))
1983 if (len == 3 && name[1] == 'I' && name[2] == 'G')
1986 /* Using ${^...} variables is likely to be sufficiently rare that
1987 it seems sensible to avoid the space hit of also checking the
1989 case '\017': /* ${^OPEN} */
1990 if (strEQ(name1, "PEN"))
1993 case '\024': /* ${^TAINT} */
1994 if (strEQ(name1, "AINT"))
1997 case '\025': /* ${^UNICODE} */
1998 if (strEQ(name1, "NICODE"))
2000 if (strEQ(name1, "TF8LOCALE"))
2003 case '\027': /* ${^WARNING_BITS} */
2004 if (strEQ(name1, "ARNING_BITS"))
2017 const char *end = name + len;
2018 while (--end > name) {
2026 /* Because we're already assuming that name is NUL terminated
2027 below, we can treat an empty name as "\0" */
2054 case '\001': /* $^A */
2055 case '\003': /* $^C */
2056 case '\004': /* $^D */
2057 case '\005': /* $^E */
2058 case '\006': /* $^F */
2059 case '\010': /* $^H */
2060 case '\011': /* $^I, NOT \t in EBCDIC */
2061 case '\014': /* $^L */
2062 case '\016': /* $^N */
2063 case '\017': /* $^O */
2064 case '\020': /* $^P */
2065 case '\023': /* $^S */
2066 case '\024': /* $^T */
2067 case '\026': /* $^V */
2068 case '\027': /* $^W */
2089 * c-indentation-style: bsd
2091 * indent-tabs-mode: t
2094 * ex: set ts=8 sts=4 sw=4 noet: