1 /*
 2  * Copyright (c) 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  * @test
26  * @summary Test casting of value objects to an unloaded type.
27  * @enablePreview
28  * @library /test/lib
29  * @run main/othervm -Xbatch -XX:CompileCommand=dontinline,TestUnloadedCastType::test*
30  *                   TestUnloadedCastType
31  */
32 
33 import jdk.test.lib.Asserts;
34 
35 public class TestUnloadedCastType {
36 
37     static value class MyValue {
38         int x = 0;
39     }
40 
41     static class Unloaded { }
42 
43     public static Object test(MyValue val) {
44         Object obj = val;
45         return (Unloaded)obj;
46     }
47 
48     public static void main(String[] args) {
49         for (int i = 0; i < 50_000; ++i) {
50             Asserts.assertEQ(test(null), null);
51         }
52         try {
53             test(new MyValue());
54             throw new RuntimeException("No ClassCastException thrown");
55         } catch (ClassCastException e) {
56             // Expected
57         }
58     }
59 }