2 #define PERL_IN_UNIVERSAL_C
6 * Contributed by Graham Barr <Graham.Barr@tiuk.ti.com>
7 * The main guts of traverse_isa was actually copied from gv_fetchmeth
11 S_isa_lookup(pTHX_ HV *stash, const char *name, HV* name_stash,
20 /* A stash/class can go by many names (ie. User == main::User), so
21 we compare the stash itself just in case */
22 if (name_stash && (stash == name_stash))
25 if (strEQ(HvNAME(stash), name))
29 Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'",
32 gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE);
34 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (subgen = GvSV(gv))
37 if (SvIV(subgen) == PL_sub_generation) {
39 SV** svp = (SV**)hv_fetch(hv, name, len, FALSE);
40 if (svp && (sv = *svp) != (SV*)&PL_sv_undef) {
41 DEBUG_o( Perl_deb(aTHX_ "Using cached ISA %s for package %s\n",
42 name, HvNAME(stash)) );
47 DEBUG_o( Perl_deb(aTHX_ "ISA Cache in package %s is stale\n",
50 sv_setiv(subgen, PL_sub_generation);
54 gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE);
56 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
58 gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE);
62 if (SvTYPE(gv) != SVt_PVGV)
63 gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE);
68 subgen = newSViv(PL_sub_generation);
73 SV** svp = AvARRAY(av);
74 /* NOTE: No support for tied ISA */
75 I32 items = AvFILLp(av) + 1;
78 HV* basestash = gv_stashsv(sv, FALSE);
80 if (ckWARN(WARN_MISC))
81 Perl_warner(aTHX_ WARN_SYNTAX,
82 "Can't locate package %s for @%s::ISA",
83 SvPVX(sv), HvNAME(stash));
86 if (&PL_sv_yes == isa_lookup(basestash, name, name_stash,
88 (void)hv_store(hv,name,len,&PL_sv_yes,0);
92 (void)hv_store(hv,name,len,&PL_sv_no,0);
96 return boolSV(strEQ(name, "UNIVERSAL"));
100 =head1 SV Manipulation Functions
102 =for apidoc sv_derived_from
104 Returns a boolean indicating whether the SV is derived from the specified
105 class. This is the function that implements C<UNIVERSAL::isa>. It works
106 for class names as well as for objects.
112 Perl_sv_derived_from(pTHX_ SV *sv, const char *name)
126 type = sv_reftype(sv,0);
131 stash = gv_stashsv(sv, FALSE);
134 name_stash = gv_stashpv(name, FALSE);
136 return (type && strEQ(type,name)) ||
137 (stash && isa_lookup(stash, name, name_stash, strlen(name), 0)
145 void XS_UNIVERSAL_isa(pTHX_ CV *cv);
146 void XS_UNIVERSAL_can(pTHX_ CV *cv);
147 void XS_UNIVERSAL_VERSION(pTHX_ CV *cv);
152 XS(XS_utf8_downgrade);
153 XS(XS_utf8_unicode_to_native);
154 XS(XS_utf8_native_to_unicode);
155 XS(XS_access_readonly);
158 Perl_boot_core_UNIVERSAL(pTHX)
160 char *file = __FILE__;
162 newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file);
163 newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file);
164 newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file);
165 newXS("utf8::valid", XS_utf8_valid, file);
166 newXS("utf8::encode", XS_utf8_encode, file);
167 newXS("utf8::decode", XS_utf8_decode, file);
168 newXS("utf8::upgrade", XS_utf8_upgrade, file);
169 newXS("utf8::downgrade", XS_utf8_downgrade, file);
170 newXS("utf8::native_to_unicode", XS_utf8_native_to_unicode, file);
171 newXS("utf8::unicode_to_native", XS_utf8_unicode_to_native, file);
172 newXSproto("access::readonly",XS_access_readonly, file, "\\[$%@];$");
184 Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)");
191 if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv))))
194 name = (char *)SvPV(ST(1),n_a);
196 ST(0) = boolSV(sv_derived_from(sv, name));
210 Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)");
217 if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv))))
220 name = (char *)SvPV(ST(1),n_a);
229 pkg = gv_stashsv(sv, FALSE);
233 GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE);
235 rv = sv_2mortal(newRV((SV*)GvCV(gv)));
242 XS(XS_UNIVERSAL_VERSION)
252 sv = (SV*)SvRV(ST(0));
254 Perl_croak(aTHX_ "Cannot find version of an unblessed reference");
258 pkg = gv_stashsv(ST(0), FALSE);
261 gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**);
263 if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) {
264 SV *nsv = sv_newmortal();
270 sv = (SV*)&PL_sv_undef;
279 Perl_croak(aTHX_ "%s does not define $%s::VERSION--version check failed",
280 HvNAME(pkg), HvNAME(pkg));
282 if (!SvNIOK(sv) && SvPOK(sv)) {
283 char *str = SvPVx(sv,len);
286 /* XXX could DWIM "1.2.3" here */
287 if (!isDIGIT(str[len]) && str[len] != '.' && str[len] != '_')
291 if (SvNOK(req) && SvPOK(req)) {
292 /* they said C<use Foo v1.2.3> and $Foo::VERSION
293 * doesn't look like a float: do string compare */
294 if (sv_cmp(req,sv) == 1) {
295 Perl_croak(aTHX_ "%s v%"VDf" required--"
296 "this is only v%"VDf,
297 HvNAME(pkg), req, sv);
301 /* they said C<use Foo 1.002_003> and $Foo::VERSION
302 * doesn't look like a float: force numeric compare */
303 (void)SvUPGRADE(sv, SVt_PVNV);
304 SvNVX(sv) = str_to_version(sv);
309 /* if we get here, we're looking for a numeric comparison,
310 * so force the required version into a float, even if they
311 * said C<use Foo v1.2.3> */
312 if (SvNOK(req) && SvPOK(req)) {
314 req = sv_newmortal();
318 if (SvNV(req) > SvNV(sv))
319 Perl_croak(aTHX_ "%s version %s required--this is only version %s",
320 HvNAME(pkg), SvPV_nolen(req), SvPV_nolen(sv));
333 Perl_croak(aTHX_ "Usage: utf8::valid(sv)");
338 char *s = SvPV(sv,len);
339 if (!SvUTF8(sv) || is_utf8_string((U8*)s,len))
352 Perl_croak(aTHX_ "Usage: utf8::encode(sv)");
365 Perl_croak(aTHX_ "Usage: utf8::decode(sv)");
370 RETVAL = sv_utf8_decode(sv);
371 ST(0) = boolSV(RETVAL);
381 Perl_croak(aTHX_ "Usage: utf8::upgrade(sv)");
387 RETVAL = sv_utf8_upgrade(sv);
388 XSprePUSH; PUSHi((IV)RETVAL);
393 XS(XS_utf8_downgrade)
396 if (items < 1 || items > 2)
397 Perl_croak(aTHX_ "Usage: utf8::downgrade(sv, failok=0)");
406 failok = (int)SvIV(ST(1));
409 RETVAL = sv_utf8_downgrade(sv, failok);
410 ST(0) = boolSV(RETVAL);
416 XS(XS_utf8_native_to_unicode)
422 Perl_croak(aTHX_ "Usage: utf8::native_to_unicode(sv)");
424 ST(0) = sv_2mortal(newSViv(NATIVE_TO_UNI(uv)));
428 XS(XS_utf8_unicode_to_native)
434 Perl_croak(aTHX_ "Usage: utf8::unicode_to_native(sv)");
436 ST(0) = sv_2mortal(newSViv(UNI_TO_NATIVE(uv)));
440 XS(XS_access_readonly)
443 SV *sv = SvRV(ST(0));
444 IV old = SvREADONLY(sv);