8144832: cast conversion fails when converting a type-variable to primitive type

Reviewed-by: mcimadamore

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

@@ -1436,12 +1436,13 @@ public class Types {
     public boolean isCastable(Type t, Type s, Warner warn) {
         if (t == s)
             return true;
-
-        if (t.isPrimitive() != s.isPrimitive())
+        if (t.isPrimitive() != s.isPrimitive()) {
+            t = skipTypeVars(t, false);
             return (isConvertible(t, s, warn)
                     || (allowObjectToPrimitiveCast &&
                         s.isPrimitive() &&
                         isSubtype(boxedClass(s).type, t)));
+        }
         if (warn != warnStack.head) {
             try {
                 warnStack = warnStack.prepend(warn);

langtools/test/tools/javac/types/CastTest.java

@@ -35,8 +35,6 @@
  */
 
 import com.sun.tools.javac.code.Type;
-import com.sun.tools.javac.code.Type.*;
-import com.sun.tools.javac.code.Symbol.*;
 import java.lang.reflect.Array;
 
 import static com.sun.tools.javac.code.Flags.*;
@@ -65,7 +63,7 @@ public class CastTest extends TypeHarness {
     /*C*/       { F   , F    , F  , F   , F    , F     , F   , F   , T, F , T, T, F     , F      , F    , F     , F      , F       , F     , F     , F  , F   , F  , F },
     /*+C*/      { F   , F    , F  , F   , F    , F     , F   , F   , F, T , F, T, F     , F      , F    , F     , F      , F       , F     , F     , F  , F   , F  , F },
     /*I*/       { F   , F    , F  , F   , F    , F     , F   , F   , T, F , T, T, F     , F      , F    , F     , F      , F       , F     , F     , F  , F   , F  , F },
-    /*T*/       { F   , F    , F  , F   , F    , F     , F   , F   , T, T , T, T, T     , T      , T    , T     , T      , T       , T     , T     , T  , T   , T  , T },
+    /*T*/       { T   , T    , T  , T   , T    , T     , T   , T   , T, T , T, T, T     , T      , T    , T     , T      , T       , T     , T     , T  , T   , T  , T },
     /*byte[]*/  { F   , F    , F  , F   , F    , F     , F   , F   , F, F , F, T, T     , F      , F    , F     , F      , F       , F     , F     , F  , F   , F  , F },
     /*short[]*/ { F   , F    , F  , F   , F    , F     , F   , F   , F, F , F, T, F     , T      , F    , F     , F      , F       , F     , F     , F  , F   , F  , F },
     /*int[]*/   { F   , F    , F  , F   , F    , F     , F   , F   , F, F , F, T, F     , F      , T    , F     , F      , F       , F     , F     , F  , F   , F  , F },

langtools/test/tools/javac/types/CastToTypeVarTest.java

+/*
+ * Copyright (c) 2015, 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 8144832
+ * @summary cast conversion fails when converting a type-variable to primitive type
+ * @compile -Werror -Xlint:all CastToTypeVarTest.java
+ */
+
+public class CastToTypeVarTest<X, Y extends X> {
+    void foo(Y y) {
+        X x = (X)y;
+    }
+}

langtools/test/tools/javac/types/CastTypeVarToPrimitiveTest.java

+/*
+ * Copyright (c) 2015, 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 8144832
+ * @summary cast conversion fails when converting a type-variable to primitive type
+ * @compile CastTypeVarToPrimitiveTest.java
+ */
+
+public class CastTypeVarToPrimitiveTest<T> {
+    void foo(T valIn){
+        double val = (double)valIn;
+    }
+}