1 /*
 2  * Copyright (c) 2023, 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 package org.openjdk.bench.java.lang.foreign;
24 
25 import org.openjdk.jmh.annotations.Benchmark;
26 import org.openjdk.jmh.annotations.BenchmarkMode;
27 import org.openjdk.jmh.annotations.Fork;
28 import org.openjdk.jmh.annotations.Measurement;
29 import org.openjdk.jmh.annotations.Mode;
30 import org.openjdk.jmh.annotations.OutputTimeUnit;
31 import org.openjdk.jmh.annotations.Param;
32 import org.openjdk.jmh.annotations.Scope;
33 import org.openjdk.jmh.annotations.Setup;
34 import org.openjdk.jmh.annotations.State;
35 import org.openjdk.jmh.annotations.Warmup;
36 
37 import java.lang.foreign.Arena;
38 import java.lang.foreign.MemorySegment;
39 import java.util.concurrent.TimeUnit;
40 
41 @BenchmarkMode(Mode.AverageTime)
42 @Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
43 @Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
44 @State(Scope.Benchmark)
45 @OutputTimeUnit(TimeUnit.NANOSECONDS)
46 @Fork(value = 3, jvmArgsAppend = {"--enable-native-access=ALL-UNNAMED", "--enable-preview"})
47 public class ToJavaStringTest {
48 
49     private MemorySegment strSegment;
50 
51     @Param({"5", "20", "100", "200"})
52     int size;
53 
54     static {
55         System.loadLibrary("ToJavaString");
56     }
57 
58     @Setup
59     public void setup() {
60         var arena = Arena.ofAuto();
61         strSegment = arena.allocateFrom(LOREM.substring(0, size));
62     }
63 
64     @Benchmark
65     public String panama_readString() {
66         return strSegment.getString(0);
67     }
68 
69     @Benchmark
70     public String jni_readString() {
71         return readString(strSegment.address());
72     }
73 
74     static native String readString(long addr);
75 
76     static String LOREM = """
77                 Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et
78                  dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip
79                  ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu
80                  fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt
81                  mollit anim id est laborum.
82                 """;
83 
84 }