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comparison test/compiler/6478991/NullCheckTest.java @ 3792:15559220ce79

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6478991: C1 NullCheckEliminator yields incorrect exceptions Reviewed-by: twisti, iveresov
author never
date Tue, 05 Jul 2011 16:07:54 -0700
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3791:2c359f27615c 3792:15559220ce79
1 /*
2 * Copyright (c) 2011, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 /**
26 * @test
27 * @bug 6478991
28 * @summary C1 NullCheckEliminator yields incorrect exceptions
29 *
30 * @run main/othervm -XX:CompileOnly=NullCheckTest.test,NullCheckTest.inlined -Xcomp NullCheckTest
31 */
32
33 public class NullCheckTest {
34 static class A {
35 int f;
36
37 public final void inlined(A a) {
38 // This cast is intended to fail.
39 B b = ((B) a);
40 }
41 }
42
43 static class B extends A {
44 }
45
46
47 private static void test(A a1, A a2) {
48 // Inlined call must do a null check on a1.
49 // However, the exlipcit NullCheck instruction is eliminated and
50 // the null check is folded into the field load below, so the
51 // exception in the inlined method is thrown before the null check
52 // and the NullPointerException is not thrown.
53 a1.inlined(a2);
54
55 int x = a1.f;
56 }
57
58 public static void main(String[] args) {
59 // load classes
60 new B();
61 try {
62 test(null, new A());
63
64 throw new InternalError("FAILURE: no exception");
65 } catch (NullPointerException ex) {
66 System.out.println("CORRECT: NullPointerException");
67 } catch (ClassCastException ex) {
68 System.out.println("FAILURE: ClassCastException");
69 throw ex;
70 }
71 }
72 }