6 * Contributed by Graham Barr <Graham.Barr@tiuk.ti.com>
7 * The main guts of traverse_isa was actually copied from gv_fetchmeth
11 isa_lookup(stash, name, len, level)
25 if(strEQ(HvNAME(stash), name))
29 croak("Recursive inheritance detected");
31 gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE);
33 if (gvp && (gv = *gvp) != (GV*)&sv_undef && (hv = GvHV(gv))) {
35 SV** svp = (SV**)hv_fetch(hv, name, len, FALSE);
36 if (svp && (sv = *svp) != (SV*)&sv_undef)
40 gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE);
42 if (gvp && (gv = *gvp) != (GV*)&sv_undef && (av = GvAV(gv))) {
44 gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE);
48 if (SvTYPE(gv) != SVt_PVGV)
49 gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE);
54 SV** svp = AvARRAY(av);
55 I32 items = AvFILL(av) + 1;
58 HV* basestash = gv_stashsv(sv, FALSE);
61 warn("Can't locate package %s for @%s::ISA",
62 SvPVX(sv), HvNAME(stash));
65 if(&sv_yes == isa_lookup(basestash, name, len, level + 1)) {
66 (void)hv_store(hv,name,len,&sv_yes,0);
70 (void)hv_store(hv,name,len,&sv_no,0);
86 croak("Usage: UNIVERSAL::isa(reference, kind)");
91 name = (char *)SvPV(ST(1),na);
95 type = sv_reftype(sv,0);
100 stash = gv_stashsv(sv, FALSE);
103 ST(0) = (type && strEQ(type,name)) ||
104 (stash && isa_lookup(stash, name, strlen(name), 0) == &sv_yes)
122 croak("Usage: UNIVERSAL::can(object-ref, method)");
125 name = (char *)SvPV(ST(1),na);
128 if(SvROK(sv) && (sv = (SV*)SvRV(sv)) && SvOBJECT(sv)) {
129 gv = gv_fetchmethod(SvSTASH(sv), name);
132 /* If the sub is only a stub then we may have a gv to AUTOLOAD */
133 GV **gvp = (GV**)hv_fetch(GvSTASH(gv), name, strlen(name), TRUE);
134 if(gvp && (cvp = GvCV(*gvp))) {
136 sv_setsv(rv, newRV((SV*)cvp));
146 XS(XS_UNIVERSAL_is_instance)
149 ST(0) = SvROK(ST(0)) ? &sv_yes : &sv_no;
154 XS(XS_UNIVERSAL_class)
158 SV *sv = sv_newmortal();
159 sv_setpv(sv, HvNAME(SvSTASH(ST(0))));
166 XS(XS_UNIVERSAL_VERSION)
176 sv = (SV*)SvRV(ST(0));
178 croak("Cannot find version of an unblessed reference");
182 pkg = gv_stashsv(ST(0), FALSE);
185 gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**);
187 if (gvp && (gv = *gvp) != (GV*)&sv_undef && (sv = GvSV(gv))) {
188 SV *nsv = sv_newmortal();
198 if(items > 1 && (undef || SvNV(ST(1)) > SvNV(sv)))
199 croak("%s version %s required--this is only version %s",
200 HvNAME(pkg),SvPV(ST(1),na),undef ? undef : SvPV(sv,na));
208 boot_core_UNIVERSAL()
210 char *file = __FILE__;
212 newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file);
213 newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file);
214 newXS("UNIVERSAL::class", XS_UNIVERSAL_class, file);
215 newXS("UNIVERSAL::is_instance", XS_UNIVERSAL_is_instance, file);
216 newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file);