7005095: Cast: compile reject sensible cast from final class to interface
Summary: a previous fix to cast conversion has made the compiler too strict w.r.t. final cast
Reviewed-by: jjg
--- a/langtools/src/share/classes/com/sun/tools/javac/code/Types.java Wed Dec 08 21:21:42 2010 -0800
+++ b/langtools/src/share/classes/com/sun/tools/javac/code/Types.java Thu Dec 09 15:50:10 2010 +0000
@@ -1033,12 +1033,7 @@
&& !disjointTypes(aHigh.allparams(), lowSub.allparams())
&& !disjointTypes(aLow.allparams(), highSub.allparams())
&& !disjointTypes(aLow.allparams(), lowSub.allparams())) {
- if (s.isInterface() &&
- !t.isInterface() &&
- t.isFinal() &&
- !isSubtype(t, s)) {
- return false;
- } else if (upcast ? giveWarning(a, b) :
+ if (upcast ? giveWarning(a, b) :
giveWarning(b, a))
warnStack.head.warnUnchecked();
return true;
@@ -3377,8 +3372,8 @@
public Type visitCapturedType(CapturedType t, Void s) {
Type bound = visitWildcardType(t.wildcard, null);
return (bound.contains(t)) ?
- (high ? syms.objectType : syms.botType) :
- bound;
+ erasure(bound) :
+ bound;
}
@Override
@@ -3386,7 +3381,7 @@
if (rewriteTypeVars) {
Type bound = high ?
(t.bound.contains(t) ?
- syms.objectType :
+ erasure(t.bound) :
visit(t.bound)) :
syms.botType;
return rewriteAsWildcardType(bound, t);
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/cast/7005095/T7005095neg.java Thu Dec 09 15:50:10 2010 +0000
@@ -0,0 +1,14 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug 7005095
+ * @summary Cast: compile reject sensible cast from final class to interface
+ * @compile/fail/ref=T7005095neg.out -XDrawDiagnostics T7005095neg.java
+ */
+
+class T7005095pos<T extends Integer> {
+ interface Foo<T> {}
+
+ static final class FooImpl implements Foo<String> {}
+
+ Object o = (Foo<T>) new FooImpl();
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/cast/7005095/T7005095neg.out Thu Dec 09 15:50:10 2010 +0000
@@ -0,0 +1,2 @@
+T7005095neg.java:13:25: compiler.err.prob.found.req: (compiler.misc.inconvertible.types), T7005095pos.FooImpl, T7005095pos.Foo<T>
+1 error
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/cast/7005095/T7005095pos.java Thu Dec 09 15:50:10 2010 +0000
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 7005095
+ * @summary Cast: compile reject sensible cast from final class to interface
+ * @compile T7005095pos.java
+ */
+
+class T7005095pos<T extends CharSequence> {
+ interface Foo<T> {}
+
+ static final class FooImpl implements Foo<String> {}
+
+ Object o = (Foo<T>) new FooImpl();
+}