1 /*
 2  * Copyright (c) 2020, 2024, 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
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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 import jdk.internal.vm.annotation.LooselyConsistentValue;
26 import jdk.test.lib.Asserts;
27 
28 
29 /*
30  * @test
31  * @summary Test JNI IsSameObject semantic with inline types
32  * @library /testlibrary /test/lib
33  * @modules java.base/jdk.internal.vm.annotation
34  * @enablePreview
35  * @compile TestJNIIsSameObject.java
36  * @run main/othervm/native TestJNIIsSameObject
37  */
38 
39 public class TestJNIIsSameObject {
40   @LooselyConsistentValue
41   static value class Value {
42     int i;
43 
44     public Value(int i) {
45       this.i = i;
46     }
47   }
48   native static boolean isSameObject(Object o0, Object o1);
49 
50   static {
51     System.loadLibrary("JNIIsSameObject");
52   }
53 
54   public static void main(String[] args) {
55     // Same value in different instances
56     Value v0 = new Value(3);
57     Value v1 = new Value(3);
58     Asserts.assertTrue(isSameObject(v0, v1));
59 
60     // Different values
61     Value v2 = new Value(4);
62     Asserts.assertFalse(isSameObject(v0, v2));
63 
64     // Same object
65     TestJNIIsSameObject t0 = new TestJNIIsSameObject();
66     Object o = t0;
67     Asserts.assertTrue(isSameObject(t0, o));
68 
69     // Different objects
70     TestJNIIsSameObject t1 = new TestJNIIsSameObject();
71     Asserts.assertFalse(isSameObject(t0, t1));
72 
73     // Comparing against null
74     Asserts.assertFalse(isSameObject(v0, null));
75     Asserts.assertFalse(isSameObject(null, v0));
76     Asserts.assertFalse(isSameObject(t0, null));
77     Asserts.assertFalse(isSameObject(null, t0));
78 
79     // Object vs inline
80     Asserts.assertFalse(isSameObject(v0, t0));
81     Asserts.assertFalse(isSameObject(t0, v0));
82 
83   }
84 }