1 /*
 2  * Copyright (c) 2021, 2024, Red Hat, Inc. 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 package compiler.valhalla.inlinetypes;
25 
26 import jdk.internal.vm.annotation.ImplicitlyConstructible;
27 import jdk.internal.vm.annotation.LooselyConsistentValue;
28 import jdk.internal.vm.annotation.NullRestricted;
29 
30 /*
31  * @test BlackholeTest
32  * @summary Check that blackholes work with inline types
33  * @enablePreview
34  * @modules java.base/jdk.internal.value
35  *          java.base/jdk.internal.vm.annotation
36  * @run main/othervm
37  *      -Xbatch -XX:+UnlockExperimentalVMOptions
38  *      -XX:CompileCommand=blackhole,compiler/valhalla/inlinetypes/BlackholeTest.blackhole
39  *      compiler.valhalla.inlinetypes.BlackholeTest
40  */
41 
42 public class BlackholeTest {
43     @ImplicitlyConstructible
44     @LooselyConsistentValue
45     static value class MyValue {
46         int x = 0;
47     }
48 
49     @NullRestricted
50     static MyValue v;
51     @NullRestricted
52     static volatile MyValue vv;
53 
54     public static void main(String[] args) {
55         for (int c = 0; c < 5; c++) {
56             testNew();
57             testField();
58             testVolatileField();
59         }
60     }
61 
62     private static void testNew() {
63         for (int c = 0; c < 100_000; c++) {
64             blackhole(new MyValue());
65         }
66     }
67 
68     private static void testField() {
69         for (int c = 0; c < 100_000; c++) {
70             blackhole(v);
71         }
72     }
73 
74     private static void testVolatileField() {
75         for (int c = 0; c < 100_000; c++) {
76             blackhole(vv);
77         }
78     }
79 
80     public static void blackhole(MyValue v) {
81         // Should be empty
82     }
83 }