1 /*

     2  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

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     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

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    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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    24  */

    25 

    26 /**

    27  * @test

    28  * @bug 8058199

    29  * @summary Code generation problem with javac skipping a checkcast instruction

    30  */

    31 public class T8058199 {

    32 

    33     final static String SYNTHETIC_CAST_TYPE = "[Ljava.lang.String;";

    34 

    35     @SuppressWarnings("unchecked")

    36     <Z> Z[] makeArr(Z z) { return (Z[])new Object[1]; }

    37 

    38     <U> void check(U u) { }

    39 

    40     void testMethod() {

    41         test(() -> check(makeArr("")));

    42     }

    43 

    44     void testNewDiamond() {

    45         class Check<X> {

    46             Check(X x) { }

    47         }

    48         test(()-> new Check<>(makeArr("")));

    49     }

    50 

    51     void testNewGeneric() {

    52         class Check {

    53             <Z> Check(Z z) { }

    54         }

    55         test(()-> new Check(makeArr("")));

    56     }

    57 

    58     private void test(Runnable r) {

    59         try {

    60             r.run();

    61             throw new AssertionError("Missing synthetic cast");

    62         } catch (ClassCastException cce) {

    63             if (!cce.getMessage().contains(SYNTHETIC_CAST_TYPE)) {

    64                 throw new AssertionError("Bad type in synthetic cast", cce);

    65             }

    66         }

    67     }

    68 

    69     public static void main(String[] args) {

    70         T8058199 test = new T8058199();

    71         test.testMethod();

    72         test.testNewDiamond();

    73         test.testNewGeneric();

    74     }

    75 }