1 /*
 2  * Copyright (c) 2021, Red Hat, Inc. All rights reserved.
 3  * Copyright (c) 2023, 2024, Oracle and/or its affiliates. All rights reserved.
 4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 5  *
 6  * This code is free software; you can redistribute it and/or modify it
 7  * under the terms of the GNU General Public License version 2 only, as
 8  * published by the Free Software Foundation.
 9  *
10  * This code is distributed in the hope that it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13  * version 2 for more details (a copy is included in the LICENSE file that
14  * accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License version
17  * 2 along with this work; if not, write to the Free Software Foundation,
18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19  *
20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21  * or visit www.oracle.com if you need additional information or have any
22  * questions.
23  */
24 
25 /**
26  * @test
27  * @bug 8260363
28  * @summary C2 compilation fails with assert(n->Opcode() != Op_Phi) failed: cannot match
29  * @enablePreview
30  * @modules java.base/jdk.internal.value
31  *          java.base/jdk.internal.vm.annotation
32  * @run main/othervm -XX:-BackgroundCompilation TestFlatArrayAliasesCardMark
33  */
34 
35 import jdk.internal.value.ValueClass;
36 import jdk.internal.vm.annotation.ImplicitlyConstructible;
37 import jdk.internal.vm.annotation.LooselyConsistentValue;
38 import jdk.internal.vm.annotation.NullRestricted;
39 
40 @ImplicitlyConstructible
41 @LooselyConsistentValue
42 value class Test0 {
43     int x = 42;
44     short[] array = new short[7];
45 }
46 
47 public class TestFlatArrayAliasesCardMark {
48     int f = 1;
49 
50     public void method1(Test0[] array) {
51         for (int i = 0; i < 100; ++i) {
52             array[0] = array[0];
53             for (int j = 0; j < 10; ++j) {
54                 for (int k = 0; k < 10; ++k) {
55                     f = 42;
56                 }
57             }
58         }
59     }
60 
61     public static void main(String[] args) {
62         TestFlatArrayAliasesCardMark t = new TestFlatArrayAliasesCardMark();
63         Test0[] array = (Test0[])ValueClass.newNullRestrictedArray(Test0.class, 1);
64         array[0] = new Test0();
65 
66         for (int l1 = 0; l1 < 10_000; ++l1) {
67             t.method1(array);
68         }
69     }
70 }