1 /*
 2  * Copyright Amazon.com Inc. 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 package org.openjdk.bench.vm.gc.barriers.writes;
26 
27 import org.openjdk.jmh.annotations.*;
28 
29 import java.util.concurrent.TimeUnit;
30 
31 @Warmup(iterations = 3, time = 1, timeUnit = TimeUnit.SECONDS)
32 @Measurement(iterations = 3, time = 1, timeUnit = TimeUnit.SECONDS)
33 @Fork(3)
34 @BenchmarkMode(Mode.AverageTime)
35 @OutputTimeUnit(TimeUnit.NANOSECONDS)
36 @State(Scope.Thread)
37 public class MultipleKnownNulls {
38 
39     Target dst;
40 
41     @Setup
42     public void setup() {
43         dst = new Target();
44     }
45 
46     @Benchmark
47     @CompilerControl(CompilerControl.Mode.DONT_INLINE)
48     public void test() {
49         dst.x1 = null;
50         dst.x2 = null;
51         dst.x3 = null;
52         dst.x4 = null;
53     }
54 
55     static class Target {
56         Object x1;
57         Object x2;
58         Object x3;
59         Object x4;
60     }
61 
62 }