1 /*
 2  * Copyright (c) 2020, 2025, 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
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22  */
23 
24 /*
25  * @test
26  * @summary Test a hidden inline class.
27  * @library /test/lib
28  * @enablePreview
29  * @run main runtime.valhalla.inlinetypes.HiddenInlineClassTest
30  */
31 
32 package runtime.valhalla.inlinetypes;
33 
34 import java.io.File;
35 import java.lang.invoke.MethodHandles;
36 import java.lang.invoke.MethodHandles.Lookup;
37 import java.nio.file.Files;
38 import java.nio.file.Path;
39 import java.nio.file.Paths;
40 
41 public class HiddenInlineClassTest {
42     static final Path CLASSES_DIR = Paths.get(System.getProperty("test.classes", "."));
43 
44     static byte[] readClassFile(String classFileName) throws Exception {
45        Path path = CLASSES_DIR.resolve(classFileName.replace('.', File.separatorChar) + ".class");
46        return Files.readAllBytes(path);
47     }
48 
49     public static void main(String[] args) throws Throwable {
50         Lookup lookup = MethodHandles.lookup();
51         byte[] bytes = readClassFile("runtime.valhalla.inlinetypes.HiddenPoint");
52 
53         // Define a hidden class that is an inline type.
54         Class<?> c = lookup.defineHiddenClass(bytes, true).lookupClass();
55         Object hp = c.newInstance();
56         String s = (String)c.getMethod("getValue").invoke(hp);
57         if (!s.equals("x: 0, y: 0")) {
58             throw new RuntimeException(
59                 "wrong value returned by method getValue() in inline hidden class: " + s);
60         }
61     }
62 
63 }
64 
65 value class HiddenPoint {
66     int x;
67     int y;
68 
69     HiddenPoint() {
70         this.x = 0;
71         this.y = 0;
72     }
73 
74     public String getValue() {
75         return "x: " + x + ", y: " + y;
76     }
77 }
78