1 /*
2  * Copyright (C) 2017 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 // This test was inspired by benchmarks.MicroMethodHandles.java.MicroMethodHandles.
18 
19 import java.io.PrintStream;
20 import java.lang.invoke.MethodHandle;
21 import java.lang.invoke.MethodHandles;
22 import java.lang.invoke.MethodType;
23 
24 class A {
binaryFunction(int x, double y)25   public Long binaryFunction(int x, double y) {
26     return 1000l;
27   }
28 }
29 
30 class Test {
Test()31   Test() throws Throwable {
32     this.handle = MethodHandles.lookup().findVirtual(A.class, "binaryFunction",
33                                                      MethodType.methodType(Long.class, int.class,
34                                                                            double.class));
35     this.a = new A();
36     this.x = new Integer(72);
37     this.y = new Double(-1.39e-31);
38   }
39 
execute()40   void execute() {
41     try {
42       executeFor(2000);
43       System.out.println(getName());
44     } catch (Throwable t) {
45       System.err.println("Exception during the execution of " + getName());
46       System.err.println(t);
47       t.printStackTrace(new PrintStream(System.err));
48       System.exit(1);
49     }
50   }
51 
executeFor(long timeMinimumMillis)52   void executeFor(long timeMinimumMillis) throws Throwable {
53     long startTime = System.currentTimeMillis();
54     long elapsed = 0;
55     while (elapsed < timeMinimumMillis) {
56       exercise();
57       elapsed = System.currentTimeMillis() - startTime;
58     }
59   }
60 
exercise()61   void exercise() throws Throwable {
62     for (int i = 0; i < EXERCISE_ITERATIONS; ++i) {
63       run();
64     }
65   }
66 
run()67   void run() throws Throwable {
68     long result = (long) handle.invoke(a, x, y);
69   }
70 
getName()71   String getName() {
72     return getClass().getSimpleName();
73   }
74 
75   private static final int EXERCISE_ITERATIONS = 500;
76 
77   private MethodHandle handle;
78   private A a;
79   private Integer x;
80   private Double y;
81 }
82 
83 public class Main {
main(String[] args)84   public static void main(String[] args) throws Throwable {
85     Test[] tests = new Test[] { new Test(), new Test(), new Test() };
86     for (Test test : tests) {
87       test.execute();
88     }
89     System.out.println("passed");
90   }
91 }
92