1 /*
 2  * Copyright (c) 2021, 2024, Red Hat, Inc. All rights reserved.
 3  * Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
 4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 5  *
 6  * This code is free software; you can redistribute it and/or modify it
 7  * under the terms of the GNU General Public License version 2 only, as
 8  * published by the Free Software Foundation.
 9  *
10  * This code is distributed in the hope that it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13  * version 2 for more details (a copy is included in the LICENSE file that
14  * accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License version
17  * 2 along with this work; if not, write to the Free Software Foundation,
18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19  *
20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21  * or visit www.oracle.com if you need additional information or have any
22  * questions.
23  */
24 
25 package compiler.valhalla.inlinetypes;
26 
27 import jdk.internal.vm.annotation.LooselyConsistentValue;
28 import jdk.internal.vm.annotation.NullRestricted;
29 import jdk.internal.vm.annotation.Strict;
30 
31 /*
32  * @test BlackholeTest
33  * @summary Check that blackholes work with inline types
34  * @enablePreview
35  * @modules java.base/jdk.internal.value
36  *          java.base/jdk.internal.vm.annotation
37  * @run main/othervm
38  *      -Xbatch -XX:+UnlockExperimentalVMOptions
39  *      -XX:CompileCommand=blackhole,compiler/valhalla/inlinetypes/BlackholeTest.blackhole
40  *      compiler.valhalla.inlinetypes.BlackholeTest
41  */
42 
43 public class BlackholeTest {
44     @LooselyConsistentValue
45     static value class MyValue {
46         int x = 0;
47     }
48 
49     @Strict
50     @NullRestricted
51     static MyValue v = new MyValue();
52     @Strict
53     @NullRestricted
54     static volatile MyValue vv = new MyValue();
55 
56     public static void main(String[] args) {
57         for (int c = 0; c < 5; c++) {
58             testNew();
59             testField();
60             testVolatileField();
61         }
62     }
63 
64     private static void testNew() {
65         for (int c = 0; c < 100_000; c++) {
66             blackhole(new MyValue());
67         }
68     }
69 
70     private static void testField() {
71         for (int c = 0; c < 100_000; c++) {
72             blackhole(v);
73         }
74     }
75 
76     private static void testVolatileField() {
77         for (int c = 0; c < 100_000; c++) {
78             blackhole(vv);
79         }
80     }
81 
82     public static void blackhole(MyValue v) {
83         // Should be empty
84     }
85 }