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
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  * @summary Test a hidden inline class.
27  * @library /test/lib
28  * @enablePreview
29  * @run main/othervm HiddenInlineClassTest
30  */
31 
32 import java.io.File;
33 import java.lang.invoke.MethodHandles;
34 import java.lang.invoke.MethodHandles.Lookup;
35 import java.nio.file.Files;
36 import java.nio.file.Path;
37 import java.nio.file.Paths;
38 
39 public class HiddenInlineClassTest {
40     static final Path CLASSES_DIR = Paths.get(System.getProperty("test.classes", "."));
41 
42     static byte[] readClassFile(String classFileName) throws Exception {
43        Path path = CLASSES_DIR.resolve(classFileName.replace('.', File.separatorChar) + ".class");
44        return Files.readAllBytes(path);
45     }
46 
47     public static void main(String[] args) throws Throwable {
48         Lookup lookup = MethodHandles.lookup();
49         byte[] bytes = readClassFile("HiddenPoint");
50 
51         // Define a hidden class that is an inline type.
52         Class<?> c = lookup.defineHiddenClass(bytes, true).lookupClass();
53         Object hp = c.newInstance();
54         String s = (String)c.getMethod("getValue").invoke(hp);
55         if (!s.equals("x: 0, y: 0")) {
56             throw new RuntimeException(
57                 "wrong value returned by method getValue() in inline hidden class: " + s);
58         }
59     }
60 
61 }
62 
63 value class HiddenPoint {
64     int x;
65     int y;
66 
67     HiddenPoint() {
68         this.x = 0;
69         this.y = 0;
70     }
71 
72     public String getValue() {
73         return "x: " + x + ", y: " + y;
74     }
75 }
76