1 /*
 2  * Copyright (c) 2022, Red Hat, Inc. 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  * @test
26  * bug 8280885
27  * @summary Shenandoah: Some tests failed with "EA: missing allocation reference path"
28  * @requires vm.gc.Shenandoah
29  *
30  * @run main/othervm -XX:-BackgroundCompilation -XX:+UseShenandoahGC -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCMode=iu
31  *                   -XX:CompileCommand=dontinline,TestUnexpectedIUBarrierEA::notInlined TestUnexpectedIUBarrierEA
32  */
33 
34 public class TestUnexpectedIUBarrierEA {
35 
36     private static Object field;
37 
38     public static void main(String[] args) {
39         for (int i = 0; i < 20_000; i++) {
40             test(false);
41         }
42     }
43 
44     private static void test(boolean flag) {
45         A a = new A();
46         B b = new B();
47         b.field = a;
48         notInlined();
49         Object o = b.field;
50         if (!(o instanceof A)) {
51 
52         }
53         C c = new C();
54         c.field = o;
55         if (flag) {
56             field = c.field;
57         }
58     }
59 
60     private static void notInlined() {
61 
62     }
63 
64     private static class A {
65     }
66 
67     private static class B {
68         public Object field;
69     }
70 
71     private static class C {
72         public Object field;
73     }
74 }