3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 * 2000, 2001, 2002, 2003, 2004, 2005, by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
12 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
13 * of your inquisitiveness, I shall spend all the rest of my days answering
14 * you. What more do you want to know?'
15 * 'The names of all the stars, and of all living things, and the whole
16 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
23 A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
24 It is a structure that holds a pointer to a scalar, an array, a hash etc,
25 corresponding to $foo, @foo, %foo.
27 GVs are usually found as values in stashes (symbol table hashes) where
28 Perl stores its global variables.
37 static const char S_autoload[] = "AUTOLOAD";
38 static const STRLEN S_autolen = sizeof(S_autoload)-1;
41 #ifdef PERL_DONT_CREATE_GVSV
43 Perl_gv_SVadd(pTHX_ GV *gv)
45 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
46 Perl_croak(aTHX_ "Bad symbol for scalar");
48 GvSV(gv) = NEWSV(72,0);
54 Perl_gv_AVadd(pTHX_ register GV *gv)
56 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
57 Perl_croak(aTHX_ "Bad symbol for array");
64 Perl_gv_HVadd(pTHX_ register GV *gv)
66 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
67 Perl_croak(aTHX_ "Bad symbol for hash");
74 Perl_gv_IOadd(pTHX_ register GV *gv)
76 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
77 Perl_croak(aTHX_ "Bad symbol for filehandle");
79 #ifdef GV_UNIQUE_CHECK
81 Perl_croak(aTHX_ "Bad symbol for filehandle (GV is unique)");
90 Perl_gv_fetchfile(pTHX_ const char *name)
100 tmplen = strlen(name) + 2;
101 if (tmplen < sizeof smallbuf)
104 Newx(tmpbuf, tmplen + 1, char);
105 /* This is where the debugger's %{"::_<$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)), Nullgv, 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)
149 const bool doproto = SvTYPE(gv) > SVt_NULL;
150 const char * const proto = (doproto && SvPOK(gv)) ? SvPVX_const(gv) : NULL;
151 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
153 assert (!(proto && has_constant));
156 /* The constant has to be a simple scalar type. */
157 switch (SvTYPE(has_constant)) {
163 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
164 sv_reftype(has_constant, 0));
170 sv_upgrade((SV*)gv, SVt_PVGV);
177 Safefree(SvPVX_mutable(gv));
180 GvGP(gv) = gp_ref(gp);
181 #ifdef PERL_DONT_CREATE_GVSV
184 GvSV(gv) = NEWSV(72,0);
186 GvLINE(gv) = CopLINE(PL_curcop);
187 /* XXX Ideally this cast would be replaced with a change to const char*
189 GvFILE(gv) = CopFILE(PL_curcop) ? CopFILE(PL_curcop) : (char *) "";
192 sv_magic((SV*)gv, (SV*)gv, PERL_MAGIC_glob, Nullch, 0);
195 Perl_sv_add_backref(aTHX_ (SV*)stash, (SV*)gv);
196 GvNAME(gv) = savepvn(name, len);
198 if (multi || doproto) /* doproto means it _was_ mentioned */
200 if (doproto) { /* Replicate part of newSUB here. */
204 /* newCONSTSUB takes ownership of the reference from us. */
205 GvCV(gv) = newCONSTSUB(stash, name, has_constant);
207 /* XXX unsafe for threads if eval_owner isn't held */
208 (void) start_subparse(0,0); /* Create empty CV in compcv. */
209 GvCV(gv) = PL_compcv;
215 CvFILE_set_from_cop(GvCV(gv), PL_curcop);
216 CvSTASH(GvCV(gv)) = PL_curstash;
218 sv_setpv((SV*)GvCV(gv), proto);
225 S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
237 #ifdef PERL_DONT_CREATE_GVSV
249 =for apidoc gv_fetchmeth
251 Returns the glob with the given C<name> and a defined subroutine or
252 C<NULL>. The glob lives in the given C<stash>, or in the stashes
253 accessible via @ISA and UNIVERSAL::.
255 The argument C<level> should be either 0 or -1. If C<level==0>, as a
256 side-effect creates a glob with the given C<name> in the given C<stash>
257 which in the case of success contains an alias for the subroutine, and sets
258 up caching info for this glob. Similarly for all the searched stashes.
260 This function grants C<"SUPER"> token as a postfix of the stash name. The
261 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
262 visible to Perl code. So when calling C<call_sv>, you should not use
263 the GV directly; instead, you should use the method's CV, which can be
264 obtained from the GV with the C<GvCV> macro.
270 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
279 /* UNIVERSAL methods should be callable without a stash */
281 level = -1; /* probably appropriate */
282 if(!(stash = gv_stashpvn("UNIVERSAL", 9, FALSE)))
286 hvname = HvNAME_get(stash);
289 "Can't use anonymous symbol table for method lookup");
291 if ((level > 100) || (level < -100))
292 Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
295 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
297 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
302 if (SvTYPE(topgv) != SVt_PVGV)
303 gv_init(topgv, stash, name, len, TRUE);
304 if ((cv = GvCV(topgv))) {
305 /* If genuine method or valid cache entry, use it */
306 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
308 /* Stale cached entry: junk it */
310 GvCV(topgv) = cv = Nullcv;
313 else if (GvCVGEN(topgv) == PL_sub_generation)
314 return 0; /* cache indicates sub doesn't exist */
317 gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE);
318 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : NULL;
320 /* create and re-create @.*::SUPER::ISA on demand */
321 if (!av || !SvMAGIC(av)) {
322 STRLEN packlen = HvNAMELEN_get(stash);
324 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
328 basestash = gv_stashpvn(hvname, packlen, TRUE);
329 gvp = (GV**)hv_fetch(basestash, "ISA", 3, FALSE);
330 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
331 gvp = (GV**)hv_fetch(stash, "ISA", 3, TRUE);
332 if (!gvp || !(gv = *gvp))
333 Perl_croak(aTHX_ "Cannot create %s::ISA", hvname);
334 if (SvTYPE(gv) != SVt_PVGV)
335 gv_init(gv, stash, "ISA", 3, TRUE);
336 SvREFCNT_dec(GvAV(gv));
337 GvAV(gv) = (AV*)SvREFCNT_inc(av);
343 SV** svp = AvARRAY(av);
344 /* NOTE: No support for tied ISA */
345 I32 items = AvFILLp(av) + 1;
347 SV* const sv = *svp++;
348 HV* const basestash = gv_stashsv(sv, FALSE);
350 if (ckWARN(WARN_MISC))
351 Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
355 gv = gv_fetchmeth(basestash, name, len,
356 (level >= 0) ? level + 1 : level - 1);
362 /* if at top level, try UNIVERSAL */
364 if (level == 0 || level == -1) {
365 HV* const lastchance = gv_stashpvn("UNIVERSAL", 9, FALSE);
368 if ((gv = gv_fetchmeth(lastchance, name, len,
369 (level >= 0) ? level + 1 : level - 1)))
373 * Cache method in topgv if:
374 * 1. topgv has no synonyms (else inheritance crosses wires)
375 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
378 GvREFCNT(topgv) == 1 &&
380 (CvROOT(cv) || CvXSUB(cv)))
382 if ((cv = GvCV(topgv)))
384 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
385 GvCVGEN(topgv) = PL_sub_generation;
389 else if (topgv && GvREFCNT(topgv) == 1) {
390 /* cache the fact that the method is not defined */
391 GvCVGEN(topgv) = PL_sub_generation;
400 =for apidoc gv_fetchmeth_autoload
402 Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
403 Returns a glob for the subroutine.
405 For an autoloaded subroutine without a GV, will create a GV even
406 if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
407 of the result may be zero.
413 Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
415 GV *gv = gv_fetchmeth(stash, name, len, level);
422 return Nullgv; /* UNIVERSAL::AUTOLOAD could cause trouble */
423 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
425 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
428 if (!(CvROOT(cv) || CvXSUB(cv)))
430 /* Have an autoload */
431 if (level < 0) /* Cannot do without a stub */
432 gv_fetchmeth(stash, name, len, 0);
433 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
442 =for apidoc gv_fetchmethod_autoload
444 Returns the glob which contains the subroutine to call to invoke the method
445 on the C<stash>. In fact in the presence of autoloading this may be the
446 glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
449 The third parameter of C<gv_fetchmethod_autoload> determines whether
450 AUTOLOAD lookup is performed if the given method is not present: non-zero
451 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
452 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
453 with a non-zero C<autoload> parameter.
455 These functions grant C<"SUPER"> token as a prefix of the method name. Note
456 that if you want to keep the returned glob for a long time, you need to
457 check for it being "AUTOLOAD", since at the later time the call may load a
458 different subroutine due to $AUTOLOAD changing its value. Use the glob
459 created via a side effect to do this.
461 These functions have the same side-effects and as C<gv_fetchmeth> with
462 C<level==0>. C<name> should be writable if contains C<':'> or C<'
463 ''>. The warning against passing the GV returned by C<gv_fetchmeth> to
464 C<call_sv> apply equally to these functions.
470 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
472 register const char *nend;
473 const char *nsplit = 0;
477 if (stash && SvTYPE(stash) < SVt_PVHV)
480 for (nend = name; *nend; nend++) {
483 else if (*nend == ':' && *(nend + 1) == ':')
487 const char * const origname = name;
491 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
492 /* ->SUPER::method should really be looked up in original stash */
493 SV *tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
494 CopSTASHPV(PL_curcop)));
495 /* __PACKAGE__::SUPER stash should be autovivified */
496 stash = gv_stashpvn(SvPVX_const(tmpstr), SvCUR(tmpstr), TRUE);
497 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
498 origname, HvNAME_get(stash), name) );
501 /* don't autovifify if ->NoSuchStash::method */
502 stash = gv_stashpvn(origname, nsplit - origname, FALSE);
504 /* however, explicit calls to Pkg::SUPER::method may
505 happen, and may require autovivification to work */
506 if (!stash && (nsplit - origname) >= 7 &&
507 strnEQ(nsplit - 7, "::SUPER", 7) &&
508 gv_stashpvn(origname, nsplit - origname - 7, FALSE))
509 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
514 gv = gv_fetchmeth(stash, name, nend - name, 0);
516 if (strEQ(name,"import") || strEQ(name,"unimport"))
517 gv = (GV*)&PL_sv_yes;
519 gv = gv_autoload4(ostash, name, nend - name, TRUE);
522 CV* const cv = GvCV(gv);
523 if (!CvROOT(cv) && !CvXSUB(cv)) {
531 if (GvCV(stubgv) != cv) /* orphaned import */
534 autogv = gv_autoload4(GvSTASH(stubgv),
535 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
545 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
553 const char *packname = "";
556 if (len == S_autolen && strnEQ(name, S_autoload, S_autolen))
559 if (SvTYPE(stash) < SVt_PVHV) {
560 packname = SvPV_const((SV*)stash, packname_len);
564 packname = HvNAME_get(stash);
565 packname_len = HvNAMELEN_get(stash);
568 if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
572 if (!(CvROOT(cv) || CvXSUB(cv)))
576 * Inheriting AUTOLOAD for non-methods works ... for now.
578 if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
579 && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)
581 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
582 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
583 packname, (int)len, name);
586 /* rather than lookup/init $AUTOLOAD here
587 * only to have the XSUB do another lookup for $AUTOLOAD
588 * and split that value on the last '::',
589 * pass along the same data via some unused fields in the CV
592 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
598 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
599 * The subroutine's original name may not be "AUTOLOAD", so we don't
600 * use that, but for lack of anything better we will use the sub's
601 * original package to look up $AUTOLOAD.
603 varstash = GvSTASH(CvGV(cv));
604 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
608 gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
609 #ifdef PERL_DONT_CREATE_GVSV
610 GvSV(vargv) = NEWSV(72,0);
614 varsv = GvSVn(vargv);
615 sv_setpvn(varsv, packname, packname_len);
616 sv_catpvn(varsv, "::", 2);
617 sv_catpvn(varsv, name, len);
618 SvTAINTED_off(varsv);
622 /* The "gv" parameter should be the glob known to Perl code as *!
623 * The scalar must already have been magicalized.
626 S_require_errno(pTHX_ GV *gv)
629 HV* stash = gv_stashpvn("Errno",5,FALSE);
631 if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
635 save_scalar(gv); /* keep the value of $! */
636 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
637 newSVpvn("Errno",5), Nullsv);
640 stash = gv_stashpvn("Errno",5,FALSE);
641 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
642 Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available");
647 =for apidoc gv_stashpv
649 Returns a pointer to the stash for a specified package. C<name> should
650 be a valid UTF-8 string and must be null-terminated. If C<create> is set
651 then the package will be created if it does not already exist. If C<create>
652 is not set and the package does not exist then NULL is returned.
658 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
660 return gv_stashpvn(name, strlen(name), create);
664 =for apidoc gv_stashpvn
666 Returns a pointer to the stash for a specified package. C<name> should
667 be a valid UTF-8 string. The C<namelen> parameter indicates the length of
668 the C<name>, in bytes. If C<create> is set then the package will be
669 created if it does not already exist. If C<create> is not set and the
670 package does not exist then NULL is returned.
676 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
683 if (namelen + 3 < sizeof smallbuf)
686 Newx(tmpbuf, namelen + 3, char);
687 Copy(name,tmpbuf,namelen,char);
688 tmpbuf[namelen++] = ':';
689 tmpbuf[namelen++] = ':';
690 tmpbuf[namelen] = '\0';
691 tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV);
692 if (tmpbuf != smallbuf)
697 GvHV(tmpgv) = newHV();
699 if (!HvNAME_get(stash))
700 hv_name_set(stash, name, namelen, 0);
705 =for apidoc gv_stashsv
707 Returns a pointer to the stash for a specified package, which must be a
708 valid UTF-8 string. See C<gv_stashpv>.
714 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
717 const char * const ptr = SvPV_const(sv,len);
718 return gv_stashpvn(ptr, len, create);
723 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
724 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
728 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
730 const char * const nambeg = SvPV_const(name, len);
731 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
735 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
738 register const char *name = nambeg;
742 register const char *namend;
744 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
745 const I32 add = flags & ~SVf_UTF8 & ~ GV_NOADD_NOINIT;
747 PERL_UNUSED_ARG(full_len);
749 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
752 for (namend = name; *namend; namend++) {
753 if ((*namend == ':' && namend[1] == ':')
754 || (*namend == '\'' && namend[1]))
758 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
766 if (len + 3 < sizeof (smallbuf))
769 Newx(tmpbuf, len+3, char);
770 Copy(name, tmpbuf, len, char);
774 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
775 gv = gvp ? *gvp : Nullgv;
776 if (gv && gv != (GV*)&PL_sv_undef) {
777 if (SvTYPE(gv) != SVt_PVGV)
778 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
782 if (tmpbuf != smallbuf)
784 if (!gv || gv == (GV*)&PL_sv_undef)
787 if (!(stash = GvHV(gv)))
788 stash = GvHV(gv) = newHV();
790 if (!HvNAME_get(stash))
791 hv_name_set(stash, nambeg, namend - nambeg, 0);
799 return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE);
804 /* No stash in name, so see how we can default */
807 if (isIDFIRST_lazy(name)) {
810 /* name is always \0 terminated, and initial \0 wouldn't return
811 true from isIDFIRST_lazy, so we know that name[1] is defined */
818 if (strEQ(name, "INC") || strEQ(name, "ENV"))
822 if (strEQ(name, "SIG"))
826 if (strEQ(name, "STDIN") || strEQ(name, "STDOUT") ||
827 strEQ(name, "STDERR"))
831 if (strEQ(name, "ARGV") || strEQ(name, "ARGVOUT"))
838 else if (IN_PERL_COMPILETIME) {
840 if (add && (PL_hints & HINT_STRICT_VARS) &&
841 sv_type != SVt_PVCV &&
842 sv_type != SVt_PVGV &&
843 sv_type != SVt_PVFM &&
844 sv_type != SVt_PVIO &&
845 !(len == 1 && sv_type == SVt_PV &&
846 (*name == 'a' || *name == 'b')) )
848 gvp = (GV**)hv_fetch(stash,name,len,0);
850 *gvp == (GV*)&PL_sv_undef ||
851 SvTYPE(*gvp) != SVt_PVGV)
855 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
856 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
857 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
859 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
860 sv_type == SVt_PVAV ? '@' :
861 sv_type == SVt_PVHV ? '%' : '$',
864 Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
870 stash = CopSTASH(PL_curcop);
876 /* By this point we should have a stash and a name */
880 SV * const err = Perl_mess(aTHX_
881 "Global symbol \"%s%s\" requires explicit package name",
882 (sv_type == SVt_PV ? "$"
883 : sv_type == SVt_PVAV ? "@"
884 : sv_type == SVt_PVHV ? "%"
886 if (USE_UTF8_IN_NAMES)
889 stash = GvHV(gv_fetchpv("<none>::", GV_ADDMULTI, SVt_PVHV));
895 if (!SvREFCNT(stash)) /* symbol table under destruction */
898 gvp = (GV**)hv_fetch(stash,name,len,add);
899 if (!gvp || *gvp == (GV*)&PL_sv_undef)
902 if (SvTYPE(gv) == SVt_PVGV) {
905 gv_init_sv(gv, sv_type);
906 if (*name=='!' && sv_type == SVt_PVHV && len==1)
910 } else if (no_init) {
914 /* Adding a new symbol */
916 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
917 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg);
918 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
919 gv_init_sv(gv, sv_type);
921 if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
922 : (PL_dowarn & G_WARN_ON ) ) )
925 /* set up magic where warranted */
929 /* Nothing else to do.
930 The compiler will probably turn the switch statement into a
931 branch table. Make sure we avoid even that small overhead for
932 the common case of lower case variable names. */
936 const char * const name2 = name + 1;
939 if (strEQ(name2, "RGV")) {
940 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
944 if (strnEQ(name2, "XPORT", 5))
948 if (strEQ(name2, "SA")) {
949 AV* const av = GvAVn(gv);
951 sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, Nullch, 0);
952 /* NOTE: No support for tied ISA */
953 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
954 && AvFILLp(av) == -1)
957 av_push(av, newSVpvn(pname = "NDBM_File",9));
958 gv_stashpvn(pname, 9, TRUE);
959 av_push(av, newSVpvn(pname = "DB_File",7));
960 gv_stashpvn(pname, 7, TRUE);
961 av_push(av, newSVpvn(pname = "GDBM_File",9));
962 gv_stashpvn(pname, 9, TRUE);
963 av_push(av, newSVpvn(pname = "SDBM_File",9));
964 gv_stashpvn(pname, 9, TRUE);
965 av_push(av, newSVpvn(pname = "ODBM_File",9));
966 gv_stashpvn(pname, 9, TRUE);
971 if (strEQ(name2, "VERLOAD")) {
972 HV* const hv = GvHVn(gv);
974 hv_magic(hv, Nullgv, PERL_MAGIC_overload);
978 if (strEQ(name2, "IG")) {
982 Newxz(PL_psig_ptr, SIG_SIZE, SV*);
983 Newxz(PL_psig_name, SIG_SIZE, SV*);
984 Newxz(PL_psig_pend, SIG_SIZE, int);
988 hv_magic(hv, Nullgv, PERL_MAGIC_sig);
989 for (i = 1; i < SIG_SIZE; i++) {
990 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
992 sv_setsv(*init, &PL_sv_undef);
1000 if (strEQ(name2, "ERSION"))
1003 case '\003': /* $^CHILD_ERROR_NATIVE */
1004 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1007 case '\005': /* $^ENCODING */
1008 if (strEQ(name2, "NCODING"))
1011 case '\017': /* $^OPEN */
1012 if (strEQ(name2, "PEN"))
1015 case '\024': /* ${^TAINT} */
1016 if (strEQ(name2, "AINT"))
1019 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
1020 if (strEQ(name2, "NICODE"))
1022 if (strEQ(name2, "TF8LOCALE"))
1025 case '\027': /* $^WARNING_BITS */
1026 if (strEQ(name2, "ARNING_BITS"))
1039 /* ensures variable is only digits */
1040 /* ${"1foo"} fails this test (and is thus writeable) */
1041 /* added by japhy, but borrowed from is_gv_magical */
1042 const char *end = name + len;
1043 while (--end > name) {
1044 if (!isDIGIT(*end)) return gv;
1051 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1052 be case '\0' in this switch statement (ie a default case) */
1058 sv_type == SVt_PVAV ||
1059 sv_type == SVt_PVHV ||
1060 sv_type == SVt_PVCV ||
1061 sv_type == SVt_PVFM ||
1064 PL_sawampersand = TRUE;
1068 sv_setpv(GvSVn(gv),PL_chopset);
1072 #ifdef COMPLEX_STATUS
1073 SvUPGRADE(GvSVn(gv), SVt_PVLV);
1079 /* If %! has been used, automatically load Errno.pm.
1080 The require will itself set errno, so in order to
1081 preserve its value we have to set up the magic
1082 now (rather than going to magicalize)
1085 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1087 if (sv_type == SVt_PVHV)
1093 AV* const av = GvAVn(gv);
1094 sv_magic((SV*)av, Nullsv, PERL_MAGIC_regdata, Nullch, 0);
1100 if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
1101 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1102 "$%c is no longer supported", *name);
1105 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
1110 AV* const av = GvAVn(gv);
1111 sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, Nullch, 0);
1115 case '\023': /* $^S */
1126 SvREADONLY_on(GvSVn(gv));
1141 case '\001': /* $^A */
1142 case '\003': /* $^C */
1143 case '\004': /* $^D */
1144 case '\005': /* $^E */
1145 case '\006': /* $^F */
1146 case '\010': /* $^H */
1147 case '\011': /* $^I, NOT \t in EBCDIC */
1148 case '\016': /* $^N */
1149 case '\017': /* $^O */
1150 case '\020': /* $^P */
1151 case '\024': /* $^T */
1152 case '\027': /* $^W */
1154 sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
1157 case '\014': /* $^L */
1158 sv_setpvn(GvSVn(gv),"\f",1);
1159 PL_formfeed = GvSVn(gv);
1162 sv_setpvn(GvSVn(gv),"\034",1);
1166 SV * const sv = GvSVn(gv);
1167 if (!sv_derived_from(PL_patchlevel, "version"))
1168 (void *)upg_version(PL_patchlevel);
1169 GvSV(gv) = vnumify(PL_patchlevel);
1170 SvREADONLY_on(GvSV(gv));
1174 case '\026': /* $^V */
1176 SV * const sv = GvSVn(gv);
1177 GvSV(gv) = new_version(PL_patchlevel);
1178 SvREADONLY_on(GvSV(gv));
1188 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1192 const HV * const hv = GvSTASH(gv);
1197 sv_setpv(sv, prefix ? prefix : "");
1199 name = HvNAME_get(hv);
1201 namelen = HvNAMELEN_get(hv);
1207 if (keepmain || strNE(name, "main")) {
1208 sv_catpvn(sv,name,namelen);
1209 sv_catpvn(sv,"::", 2);
1211 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
1215 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
1217 const GV * const egv = GvEGV(gv);
1218 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
1225 IO * const io = (IO*)NEWSV(0,0);
1227 sv_upgrade((SV *)io,SVt_PVIO);
1228 /* This used to read SvREFCNT(io) = 1;
1229 It's not clear why the reference count needed an explicit reset. NWC
1231 assert (SvREFCNT(io) == 1);
1233 /* Clear the stashcache because a new IO could overrule a package name */
1234 hv_clear(PL_stashcache);
1235 iogv = gv_fetchpv("FileHandle::", 0, SVt_PVHV);
1236 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
1237 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
1238 iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV);
1239 SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv)));
1244 Perl_gv_check(pTHX_ HV *stash)
1248 if (!HvARRAY(stash))
1250 for (i = 0; i <= (I32) HvMAX(stash); i++) {
1252 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
1255 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
1256 (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv)))
1258 if (hv != PL_defstash && hv != stash)
1259 gv_check(hv); /* nested package */
1261 else if (isALPHA(*HeKEY(entry))) {
1263 gv = (GV*)HeVAL(entry);
1264 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
1267 /* performance hack: if filename is absolute and it's a standard
1268 * module, don't bother warning */
1269 #ifdef MACOS_TRADITIONAL
1270 # define LIB_COMPONENT ":lib:"
1272 # define LIB_COMPONENT "/lib/"
1275 && PERL_FILE_IS_ABSOLUTE(file)
1276 && (instr(file, LIB_COMPONENT) || instr(file, ".pm")))
1280 CopLINE_set(PL_curcop, GvLINE(gv));
1282 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1284 CopFILEGV(PL_curcop) = gv_fetchfile(file);
1286 Perl_warner(aTHX_ packWARN(WARN_ONCE),
1287 "Name \"%s::%s\" used only once: possible typo",
1288 HvNAME_get(stash), GvNAME(gv));
1295 Perl_newGVgen(pTHX_ const char *pack)
1297 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
1301 /* hopefully this is only called on local symbol table entries */
1304 Perl_gp_ref(pTHX_ GP *gp)
1311 /* multi-named GPs cannot be used for method cache */
1312 SvREFCNT_dec(gp->gp_cv);
1317 /* Adding a new name to a subroutine invalidates method cache */
1318 PL_sub_generation++;
1325 Perl_gp_free(pTHX_ GV *gv)
1329 if (!gv || !(gp = GvGP(gv)))
1331 if (gp->gp_refcnt == 0) {
1332 if (ckWARN_d(WARN_INTERNAL))
1333 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1334 "Attempt to free unreferenced glob pointers"
1335 pTHX__FORMAT pTHX__VALUE);
1339 /* Deleting the name of a subroutine invalidates method cache */
1340 PL_sub_generation++;
1342 if (--gp->gp_refcnt > 0) {
1343 if (gp->gp_egv == gv)
1348 if (gp->gp_sv) SvREFCNT_dec(gp->gp_sv);
1349 if (gp->gp_av) SvREFCNT_dec(gp->gp_av);
1350 /* FIXME - another reference loop GV -> symtab -> GV ?
1351 Somehow gp->gp_hv can end up pointing at freed garbage. */
1352 if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) {
1353 const char *hvname = HvNAME_get(gp->gp_hv);
1354 if (PL_stashcache && hvname)
1355 hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv),
1357 SvREFCNT_dec(gp->gp_hv);
1359 if (gp->gp_io) SvREFCNT_dec(gp->gp_io);
1360 if (gp->gp_cv) SvREFCNT_dec(gp->gp_cv);
1361 if (gp->gp_form) SvREFCNT_dec(gp->gp_form);
1368 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
1370 AMT * const amtp = (AMT*)mg->mg_ptr;
1371 PERL_UNUSED_ARG(sv);
1373 if (amtp && AMT_AMAGIC(amtp)) {
1375 for (i = 1; i < NofAMmeth; i++) {
1376 CV * const cv = amtp->table[i];
1378 SvREFCNT_dec((SV *) cv);
1379 amtp->table[i] = Nullcv;
1386 /* Updates and caches the CV's */
1389 Perl_Gv_AMupdate(pTHX_ HV *stash)
1391 MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1392 AMT * const amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
1395 if (mg && amtp->was_ok_am == PL_amagic_generation
1396 && amtp->was_ok_sub == PL_sub_generation)
1397 return (bool)AMT_OVERLOADED(amtp);
1398 sv_unmagic((SV*)stash, PERL_MAGIC_overload_table);
1400 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
1403 amt.was_ok_am = PL_amagic_generation;
1404 amt.was_ok_sub = PL_sub_generation;
1405 amt.fallback = AMGfallNO;
1409 int filled = 0, have_ovl = 0;
1412 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1414 /* Try to find via inheritance. */
1415 GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1);
1416 SV * const sv = gv ? GvSV(gv) : NULL;
1420 lim = DESTROY_amg; /* Skip overloading entries. */
1421 #ifdef PERL_DONT_CREATE_GVSV
1423 /* Equivalent to !SvTRUE and !SvOK */
1426 else if (SvTRUE(sv))
1427 amt.fallback=AMGfallYES;
1429 amt.fallback=AMGfallNEVER;
1431 for (i = 1; i < lim; i++)
1432 amt.table[i] = Nullcv;
1433 for (; i < NofAMmeth; i++) {
1434 const char *cooky = PL_AMG_names[i];
1435 /* Human-readable form, for debugging: */
1436 const char *cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
1437 const STRLEN l = strlen(cooky);
1439 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
1440 cp, HvNAME_get(stash)) );
1441 /* don't fill the cache while looking up!
1442 Creation of inheritance stubs in intermediate packages may
1443 conflict with the logic of runtime method substitution.
1444 Indeed, for inheritance A -> B -> C, if C overloads "+0",
1445 then we could have created stubs for "(+0" in A and C too.
1446 But if B overloads "bool", we may want to use it for
1447 numifying instead of C's "+0". */
1448 if (i >= DESTROY_amg)
1449 gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0);
1450 else /* Autoload taken care of below */
1451 gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1);
1453 if (gv && (cv = GvCV(gv))) {
1455 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1456 && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) {
1457 /* This is a hack to support autoloading..., while
1458 knowing *which* methods were declared as overloaded. */
1459 /* GvSV contains the name of the method. */
1461 SV *gvsv = GvSV(gv);
1463 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
1464 "\" for overloaded \"%s\" in package \"%.256s\"\n",
1465 GvSV(gv), cp, hvname) );
1466 if (!gvsv || !SvPOK(gvsv)
1467 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
1470 /* Can be an import stub (created by "can"). */
1471 const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???";
1472 Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
1473 "in package \"%.256s\"",
1474 (GvCVGEN(gv) ? "Stub found while resolving"
1478 cv = GvCV(gv = ngv);
1480 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
1481 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
1482 GvNAME(CvGV(cv))) );
1484 if (i < DESTROY_amg)
1486 } else if (gv) { /* Autoloaded... */
1490 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1493 AMT_AMAGIC_on(&amt);
1495 AMT_OVERLOADED_on(&amt);
1496 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1497 (char*)&amt, sizeof(AMT));
1501 /* Here we have no table: */
1503 AMT_AMAGIC_off(&amt);
1504 sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table,
1505 (char*)&amt, sizeof(AMTS));
1511 Perl_gv_handler(pTHX_ HV *stash, I32 id)
1516 if (!stash || !HvNAME_get(stash))
1518 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1522 mg = mg_find((SV*)stash, PERL_MAGIC_overload_table);
1524 amtp = (AMT*)mg->mg_ptr;
1525 if ( amtp->was_ok_am != PL_amagic_generation
1526 || amtp->was_ok_sub != PL_sub_generation )
1528 if (AMT_AMAGIC(amtp)) {
1529 CV * const ret = amtp->table[id];
1530 if (ret && isGV(ret)) { /* Autoloading stab */
1531 /* Passing it through may have resulted in a warning
1532 "Inherited AUTOLOAD for a non-method deprecated", since
1533 our caller is going through a function call, not a method call.
1534 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
1535 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
1548 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1553 CV **cvp=NULL, **ocvp=NULL;
1554 AMT *amtp=NULL, *oamtp=NULL;
1555 int off = 0, off1, lr = 0, notfound = 0;
1556 int postpr = 0, force_cpy = 0;
1557 int assign = AMGf_assign & flags;
1558 const int assignshift = assign ? 1 : 0;
1563 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1564 && (stash = SvSTASH(SvRV(left)))
1565 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1566 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1567 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1569 && ((cv = cvp[off=method+assignshift])
1570 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1576 cv = cvp[off=method])))) {
1577 lr = -1; /* Call method for left argument */
1579 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1582 /* look for substituted methods */
1583 /* In all the covered cases we should be called with assign==0. */
1587 if ((cv = cvp[off=add_ass_amg])
1588 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1589 right = &PL_sv_yes; lr = -1; assign = 1;
1594 if ((cv = cvp[off = subtr_ass_amg])
1595 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1596 right = &PL_sv_yes; lr = -1; assign = 1;
1600 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1603 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1606 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1609 (void)((cv = cvp[off=bool__amg])
1610 || (cv = cvp[off=numer_amg])
1611 || (cv = cvp[off=string_amg]));
1617 * SV* ref causes confusion with the interpreter variable of
1620 SV* const tmpRef=SvRV(left);
1621 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1623 * Just to be extra cautious. Maybe in some
1624 * additional cases sv_setsv is safe, too.
1626 SV* const newref = newSVsv(tmpRef);
1627 SvOBJECT_on(newref);
1628 SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
1634 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1635 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1636 SV* const nullsv=sv_2mortal(newSViv(0));
1638 SV* const lessp = amagic_call(left,nullsv,
1639 lt_amg,AMGf_noright);
1640 logic = SvTRUE(lessp);
1642 SV* const lessp = amagic_call(left,nullsv,
1643 ncmp_amg,AMGf_noright);
1644 logic = (SvNV(lessp) < 0);
1647 if (off==subtr_amg) {
1658 if ((cv = cvp[off=subtr_amg])) {
1660 left = sv_2mortal(newSViv(0));
1665 case iter_amg: /* XXXX Eventually should do to_gv. */
1667 return NULL; /* Delegate operation to standard mechanisms. */
1675 return left; /* Delegate operation to standard mechanisms. */
1680 if (!cv) goto not_found;
1681 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1682 && (stash = SvSTASH(SvRV(right)))
1683 && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table))
1684 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1685 ? (amtp = (AMT*)mg->mg_ptr)->table
1687 && (cv = cvp[off=method])) { /* Method for right
1690 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1691 && (cvp=ocvp) && (lr = -1))
1692 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1693 && !(flags & AMGf_unary)) {
1694 /* We look for substitution for
1695 * comparison operations and
1697 if (method==concat_amg || method==concat_ass_amg
1698 || method==repeat_amg || method==repeat_ass_amg) {
1699 return NULL; /* Delegate operation to string conversion */
1709 postpr = 1; off=ncmp_amg; break;
1716 postpr = 1; off=scmp_amg; break;
1718 if (off != -1) cv = cvp[off];
1723 not_found: /* No method found, either report or croak */
1731 return left; /* Delegate operation to standard mechanisms. */
1734 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1735 notfound = 1; lr = -1;
1736 } else if (cvp && (cv=cvp[nomethod_amg])) {
1737 notfound = 1; lr = 1;
1740 if (off==-1) off=method;
1741 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1742 "Operation \"%s\": no method found,%sargument %s%s%s%s",
1743 AMG_id2name(method + assignshift),
1744 (flags & AMGf_unary ? " " : "\n\tleft "),
1746 "in overloaded package ":
1747 "has no overloaded magic",
1749 HvNAME_get(SvSTASH(SvRV(left))):
1752 ",\n\tright argument in overloaded package ":
1755 : ",\n\tright argument has no overloaded magic"),
1757 HvNAME_get(SvSTASH(SvRV(right))):
1759 if (amtp && amtp->fallback >= AMGfallYES) {
1760 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) );
1762 Perl_croak(aTHX_ "%"SVf, msg);
1766 force_cpy = force_cpy || assign;
1771 DEBUG_o(Perl_deb(aTHX_
1772 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1774 method+assignshift==off? "" :
1776 method+assignshift==off? "" :
1777 AMG_id2name(method+assignshift),
1778 method+assignshift==off? "" : "\")",
1779 flags & AMGf_unary? "" :
1780 lr==1 ? " for right argument": " for left argument",
1781 flags & AMGf_unary? " for argument" : "",
1782 stash ? HvNAME_get(stash) : "null",
1783 fl? ",\n\tassignment variant used": "") );
1786 /* Since we use shallow copy during assignment, we need
1787 * to dublicate the contents, probably calling user-supplied
1788 * version of copy operator
1790 /* We need to copy in following cases:
1791 * a) Assignment form was called.
1792 * assignshift==1, assign==T, method + 1 == off
1793 * b) Increment or decrement, called directly.
1794 * assignshift==0, assign==0, method + 0 == off
1795 * c) Increment or decrement, translated to assignment add/subtr.
1796 * assignshift==0, assign==T,
1798 * d) Increment or decrement, translated to nomethod.
1799 * assignshift==0, assign==0,
1801 * e) Assignment form translated to nomethod.
1802 * assignshift==1, assign==T, method + 1 != off
1805 /* off is method, method+assignshift, or a result of opcode substitution.
1806 * In the latter case assignshift==0, so only notfound case is important.
1808 if (( (method + assignshift == off)
1809 && (assign || (method == inc_amg) || (method == dec_amg)))
1816 const bool oldcatch = CATCH_GET;
1819 Zero(&myop, 1, BINOP);
1820 myop.op_last = (OP *) &myop;
1821 myop.op_next = Nullop;
1822 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1824 PUSHSTACKi(PERLSI_OVERLOAD);
1827 PL_op = (OP *) &myop;
1828 if (PERLDB_SUB && PL_curstash != PL_debstash)
1829 PL_op->op_private |= OPpENTERSUB_DB;
1833 EXTEND(SP, notfound + 5);
1834 PUSHs(lr>0? right: left);
1835 PUSHs(lr>0? left: right);
1836 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1838 PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0)));
1843 if ((PL_op = Perl_pp_entersub(aTHX)))
1851 CATCH_SET(oldcatch);
1858 ans=SvIV(res)<=0; break;
1861 ans=SvIV(res)<0; break;
1864 ans=SvIV(res)>=0; break;
1867 ans=SvIV(res)>0; break;
1870 ans=SvIV(res)==0; break;
1873 ans=SvIV(res)!=0; break;
1876 SvSetSV(left,res); return left;
1878 ans=!SvTRUE(res); break;
1883 } else if (method==copy_amg) {
1885 Perl_croak(aTHX_ "Copy method did not return a reference");
1887 return SvREFCNT_inc(SvRV(res));
1895 =for apidoc is_gv_magical_sv
1897 Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical.
1903 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
1906 const char * const temp = SvPV_const(name, len);
1907 return is_gv_magical(temp, len, flags);
1911 =for apidoc is_gv_magical
1913 Returns C<TRUE> if given the name of a magical GV.
1915 Currently only useful internally when determining if a GV should be
1916 created even in rvalue contexts.
1918 C<flags> is not used at present but available for future extension to
1919 allow selecting particular classes of magical variable.
1921 Currently assumes that C<name> is NUL terminated (as well as len being valid).
1922 This assumption is met by all callers within the perl core, which all pass
1923 pointers returned by SvPV.
1928 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
1930 PERL_UNUSED_ARG(flags);
1933 const char * const name1 = name + 1;
1936 if (len == 3 && name1[1] == 'S' && name[2] == 'A')
1940 if (len == 8 && strEQ(name1, "VERLOAD"))
1944 if (len == 3 && name[1] == 'I' && name[2] == 'G')
1947 /* Using ${^...} variables is likely to be sufficiently rare that
1948 it seems sensible to avoid the space hit of also checking the
1950 case '\017': /* ${^OPEN} */
1951 if (strEQ(name1, "PEN"))
1954 case '\024': /* ${^TAINT} */
1955 if (strEQ(name1, "AINT"))
1958 case '\025': /* ${^UNICODE} */
1959 if (strEQ(name1, "NICODE"))
1961 if (strEQ(name1, "TF8LOCALE"))
1964 case '\027': /* ${^WARNING_BITS} */
1965 if (strEQ(name1, "ARNING_BITS"))
1978 const char *end = name + len;
1979 while (--end > name) {
1987 /* Because we're already assuming that name is NUL terminated
1988 below, we can treat an empty name as "\0" */
2015 case '\001': /* $^A */
2016 case '\003': /* $^C */
2017 case '\004': /* $^D */
2018 case '\005': /* $^E */
2019 case '\006': /* $^F */
2020 case '\010': /* $^H */
2021 case '\011': /* $^I, NOT \t in EBCDIC */
2022 case '\014': /* $^L */
2023 case '\016': /* $^N */
2024 case '\017': /* $^O */
2025 case '\020': /* $^P */
2026 case '\023': /* $^S */
2027 case '\024': /* $^T */
2028 case '\026': /* $^V */
2029 case '\027': /* $^W */
2050 * c-indentation-style: bsd
2052 * indent-tabs-mode: t
2055 * ex: set ts=8 sts=4 sw=4 noet: