1 /*
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 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
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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
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22  */
23 
24 /*
25  * @test
26  * @bug 8348743
27  * @summary Tests ValueGetObjectHashCodeTest functionality for value objects.
28  * @requires vm.jvmti
29  * @modules java.base/jdk.internal.vm.annotation
30  * @enablePreview
31  * @run main/othervm/native -agentlib:ValueGetObjectHashCodeTest
32  *                          -XX:+UnlockDiagnosticVMOptions -XX:+PrintInlineLayout
33  *                          ValueGetObjectHashCodeTest
34  */
35 
36 import jdk.internal.vm.annotation.NullRestricted;
37 import jdk.internal.vm.annotation.Strict;
38 
39 public class ValueGetObjectHashCodeTest {
40 
41     private static value class ValueClass {
42         public int f1;
43         public ValueClass(int v1) { f1 = v1; }
44         public String toString() {
45             return "value(" + String.valueOf(f1) + ")";
46         }
47     }
48 
49     private static value class ValueHolder {
50         public ValueClass f1;
51         @Strict
52         @NullRestricted
53         public ValueClass f2;
54 
55         public ValueHolder(int v1, int v2) {
56             f1 = new ValueClass(v1);
57             f2 = new ValueClass(v2);
58         }
59         public String toString() {
60             return "holder{" + f1 + ", " + f2 + "}";
61         }
62     }
63 
64     private static native int getHash0(Object object);
65 
66     private static int getHash(Object object) {
67         int hash = getHash0(object);
68         System.out.println("hash (" + object + "): " + hash);
69         return hash;
70     }
71 
72     public static void main(String[] args) {
73         System.loadLibrary("ValueGetObjectHashCodeTest");
74         ValueClass v1 = new ValueClass(8);
75         ValueHolder h1 = new ValueHolder(8, 8);
76 
77         // expect the same hash code for equal value objects
78         int hash1 = getHash(v1);
79         int hash2 = getHash(h1.f1);
80         int hash3 = getHash(h1.f2);
81 
82         if (hash1 != hash2 || hash2 != hash3) {
83             throw new RuntimeException("Hash should be equal");
84         }
85     }
86 }