T8058199.java revision 2667:103d3df93bbd 
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
6 * under the terms of the GNU General Public License version 2 only, as
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
18 * 2 along with this work; if not, write to the Free Software Foundation,
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 */
31public 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}
76