6738538: javac crashes when using a type parameter as a covariant method return type

Summary: Capture conversion should be applied when acccessing a member of an intersection type
Reviewed-by: jjg

src/share/classes/com/sun/tools/javac/code/Types.java

@@ -1430,6 +1430,10 @@ public class Types {
                 long flags = sym.flags();
                 if (((flags & STATIC) == 0) && owner.type.isParameterized()) {
                     Type base = asOuterSuper(t, owner);
+                    //if t is an intersection type T = CT & I1 & I2 ... & In
+                    //its supertypes CT, I1, ... In might contain wildcards
+                    //so we need to go through capture conversion
+                    base = t.isCompound() ? capture(base) : base;
                     if (base != null) {
                         List<Type> ownerParams = owner.type.allparams();
                         List<Type> baseParams = base.allparams();

test/tools/javac/OverrideChecks/6738538/T6738538a.java

+/*
+ * Copyright 2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ * @test
+ * @bug 6738538 6687444
+ * @summary  javac crashes when using a type parameter as a covariant method return type
+ * @author Maurizio Cimadamore
+ *
+ * @compile T6738538a.java
+ */
+
+class T6738538a {
+
+    class C<T> {
+        public T m(){
+            return null;
+        }
+    }
+    interface I<T>{
+        public T m();
+    }
+    class Crash<T extends C<?> & I> {}
+}
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test/tools/javac/OverrideChecks/6738538/T6738538b.java

+/*
+ * Copyright 2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ * @test
+ * @bug 6738538 6687444
+ * @summary  javac crashes when using a type parameter as a covariant method return type
+ * @author Maurizio Cimadamore
+ *
+ * @compile T6738538b.java
+ */
+
+class T6738538b {
+    interface I1 {
+        Object m();
+    }
+
+    interface I2 {}
+
+    class C1<T> implements I1 {
+        public T m() {
+            return null;
+        }
+    }
+
+    class C2<T extends C1<?> & I2> {}
+}
\ No newline at end of file