3 * Copyright (c) 1997-2002, Larry Wall
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Artistic License, as specified in the README file.
11 * "The roots of those mountains must be roots indeed; there must be
12 * great secrets buried there which have not been discovered since the
13 * beginning." --Gandalf, relating Gollum's story
17 #define PERL_IN_UNIVERSAL_C
21 * Contributed by Graham Barr <Graham.Barr@tiuk.ti.com>
22 * The main guts of traverse_isa was actually copied from gv_fetchmeth
26 S_isa_lookup(pTHX_ HV *stash, const char *name, HV* name_stash,
35 /* A stash/class can go by many names (ie. User == main::User), so
36 we compare the stash itself just in case */
37 if (name_stash && (stash == name_stash))
40 if (strEQ(HvNAME(stash), name))
44 Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'",
47 gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE);
49 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (subgen = GvSV(gv))
52 if (SvIV(subgen) == PL_sub_generation) {
54 SV** svp = (SV**)hv_fetch(hv, name, len, FALSE);
55 if (svp && (sv = *svp) != (SV*)&PL_sv_undef) {
56 DEBUG_o( Perl_deb(aTHX_ "Using cached ISA %s for package %s\n",
57 name, HvNAME(stash)) );
62 DEBUG_o( Perl_deb(aTHX_ "ISA Cache in package %s is stale\n",
65 sv_setiv(subgen, PL_sub_generation);
69 gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE);
71 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
73 gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE);
77 if (SvTYPE(gv) != SVt_PVGV)
78 gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE);
83 subgen = newSViv(PL_sub_generation);
88 SV** svp = AvARRAY(av);
89 /* NOTE: No support for tied ISA */
90 I32 items = AvFILLp(av) + 1;
93 HV* basestash = gv_stashsv(sv, FALSE);
95 if (ckWARN(WARN_MISC))
96 Perl_warner(aTHX_ WARN_SYNTAX,
97 "Can't locate package %s for @%s::ISA",
98 SvPVX(sv), HvNAME(stash));
101 if (&PL_sv_yes == isa_lookup(basestash, name, name_stash,
103 (void)hv_store(hv,name,len,&PL_sv_yes,0);
107 (void)hv_store(hv,name,len,&PL_sv_no,0);
111 return boolSV(strEQ(name, "UNIVERSAL"));
115 =head1 SV Manipulation Functions
117 =for apidoc sv_derived_from
119 Returns a boolean indicating whether the SV is derived from the specified
120 class. This is the function that implements C<UNIVERSAL::isa>. It works
121 for class names as well as for objects.
127 Perl_sv_derived_from(pTHX_ SV *sv, const char *name)
141 type = sv_reftype(sv,0);
146 stash = gv_stashsv(sv, FALSE);
149 name_stash = gv_stashpv(name, FALSE);
151 return (type && strEQ(type,name)) ||
152 (stash && isa_lookup(stash, name, name_stash, strlen(name), 0)
160 void XS_UNIVERSAL_isa(pTHX_ CV *cv);
161 void XS_UNIVERSAL_can(pTHX_ CV *cv);
162 void XS_UNIVERSAL_VERSION(pTHX_ CV *cv);
167 XS(XS_utf8_downgrade);
168 XS(XS_utf8_unicode_to_native);
169 XS(XS_utf8_native_to_unicode);
170 XS(XS_access_readonly);
173 Perl_boot_core_UNIVERSAL(pTHX)
175 char *file = __FILE__;
177 newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file);
178 newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file);
179 newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file);
180 newXS("utf8::valid", XS_utf8_valid, file);
181 newXS("utf8::encode", XS_utf8_encode, file);
182 newXS("utf8::decode", XS_utf8_decode, file);
183 newXS("utf8::upgrade", XS_utf8_upgrade, file);
184 newXS("utf8::downgrade", XS_utf8_downgrade, file);
185 newXS("utf8::native_to_unicode", XS_utf8_native_to_unicode, file);
186 newXS("utf8::unicode_to_native", XS_utf8_unicode_to_native, file);
187 newXSproto("access::readonly",XS_access_readonly, file, "\\[$%@];$");
199 Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)");
206 if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv))))
209 name = (char *)SvPV(ST(1),n_a);
211 ST(0) = boolSV(sv_derived_from(sv, name));
225 Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)");
232 if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv))))
235 name = (char *)SvPV(ST(1),n_a);
244 pkg = gv_stashsv(sv, FALSE);
248 GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE);
250 rv = sv_2mortal(newRV((SV*)GvCV(gv)));
257 XS(XS_UNIVERSAL_VERSION)
267 sv = (SV*)SvRV(ST(0));
269 Perl_croak(aTHX_ "Cannot find version of an unblessed reference");
273 pkg = gv_stashsv(ST(0), FALSE);
276 gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**);
278 if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) {
279 SV *nsv = sv_newmortal();
285 sv = (SV*)&PL_sv_undef;
296 "%s does not define $%s::VERSION--version check failed",
297 HvNAME(pkg), HvNAME(pkg));
299 char *str = SvPVx(ST(0), len);
302 "%s defines neither package nor VERSION--version check failed", str);
305 if (!SvNIOK(sv) && SvPOK(sv)) {
306 char *str = SvPVx(sv,len);
309 /* XXX could DWIM "1.2.3" here */
310 if (!isDIGIT(str[len]) && str[len] != '.' && str[len] != '_')
314 if (SvNOK(req) && SvPOK(req)) {
315 /* they said C<use Foo v1.2.3> and $Foo::VERSION
316 * doesn't look like a float: do string compare */
317 if (sv_cmp(req,sv) == 1) {
318 Perl_croak(aTHX_ "%s v%"VDf" required--"
319 "this is only v%"VDf,
320 HvNAME(pkg), req, sv);
324 /* they said C<use Foo 1.002_003> and $Foo::VERSION
325 * doesn't look like a float: force numeric compare */
326 (void)SvUPGRADE(sv, SVt_PVNV);
327 SvNVX(sv) = str_to_version(sv);
332 /* if we get here, we're looking for a numeric comparison,
333 * so force the required version into a float, even if they
334 * said C<use Foo v1.2.3> */
335 if (SvNOK(req) && SvPOK(req)) {
337 req = sv_newmortal();
341 if (SvNV(req) > SvNV(sv))
342 Perl_croak(aTHX_ "%s version %s required--this is only version %s",
343 HvNAME(pkg), SvPV_nolen(req), SvPV_nolen(sv));
356 Perl_croak(aTHX_ "Usage: utf8::valid(sv)");
361 char *s = SvPV(sv,len);
362 if (!SvUTF8(sv) || is_utf8_string((U8*)s,len))
375 Perl_croak(aTHX_ "Usage: utf8::encode(sv)");
388 Perl_croak(aTHX_ "Usage: utf8::decode(sv)");
393 RETVAL = sv_utf8_decode(sv);
394 ST(0) = boolSV(RETVAL);
404 Perl_croak(aTHX_ "Usage: utf8::upgrade(sv)");
410 RETVAL = sv_utf8_upgrade(sv);
411 XSprePUSH; PUSHi((IV)RETVAL);
416 XS(XS_utf8_downgrade)
419 if (items < 1 || items > 2)
420 Perl_croak(aTHX_ "Usage: utf8::downgrade(sv, failok=0)");
429 failok = (int)SvIV(ST(1));
432 RETVAL = sv_utf8_downgrade(sv, failok);
433 ST(0) = boolSV(RETVAL);
439 XS(XS_utf8_native_to_unicode)
445 Perl_croak(aTHX_ "Usage: utf8::native_to_unicode(sv)");
447 ST(0) = sv_2mortal(newSViv(NATIVE_TO_UNI(uv)));
451 XS(XS_utf8_unicode_to_native)
457 Perl_croak(aTHX_ "Usage: utf8::unicode_to_native(sv)");
459 ST(0) = sv_2mortal(newSViv(UNI_TO_NATIVE(uv)));
463 XS(XS_access_readonly)
466 SV *sv = SvRV(ST(0));
467 IV old = SvREADONLY(sv);