1 /* 2 * Copyright (c) 2014 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 package org.openjdk.bench.java.lang.invoke; 26 27 import org.openjdk.jmh.annotations.Benchmark; 28 import org.openjdk.jmh.annotations.BenchmarkMode; 29 import org.openjdk.jmh.annotations.Mode; 30 import org.openjdk.jmh.annotations.OutputTimeUnit; 31 import org.openjdk.jmh.annotations.Scope; 32 import org.openjdk.jmh.annotations.Setup; 33 import org.openjdk.jmh.annotations.State; 34 35 import java.lang.invoke.MethodHandle; 36 import java.lang.invoke.MethodHandleProxies; 37 import java.lang.invoke.MethodHandles; 38 import java.lang.invoke.MethodType; 39 import java.util.concurrent.TimeUnit; 40 41 /** 42 * Benchmark evaluates the performance of MethodHandleProxies.* 43 */ 44 @BenchmarkMode(Mode.AverageTime) 45 @OutputTimeUnit(TimeUnit.NANOSECONDS) 46 @State(Scope.Thread) 47 public class MethodHandleProxiesAsIFInstance { 48 49 /** 50 * Implementation notes: 51 * - asInterfaceInstance() can only target static MethodHandle (adapters needed to call instance method?) 52 * - baselineCompute will quickly degrade to GC test, if escape analysis is unable to spare the allocation 53 * - testCreate* will always be slower if allocation is not eliminated; baselineAllocCompute makes sure allocation is present 54 */ 55 56 public int i; 57 58 private MethodHandle target; 59 private Doable precreated; 60 61 @Setup 62 public void setup() throws Throwable { 63 target = MethodHandles.lookup().findStatic(MethodHandleProxiesAsIFInstance.class, "doWork", MethodType.methodType(int.class, int.class)); 64 precreated = MethodHandleProxies.asInterfaceInstance(Doable.class, target); 65 } 66 67 @Benchmark 68 public Doable testCreate() { 69 Doable doable = MethodHandleProxies.asInterfaceInstance(Doable.class, target); 70 return doable; // make sure allocation happens 71 } 72 73 @Benchmark 74 public Doable testCreateCall() { 75 Doable doable = MethodHandleProxies.asInterfaceInstance(Doable.class, target); 76 i = doable.doWork(i); // make sure computation happens 77 return null; // let allocation be eliminated 78 } 79 80 @Benchmark 81 public Doable testCall() { 82 i = precreated.doWork(i); // make sure computation happens 83 return precreated; 84 } 85 86 @Benchmark 87 public Doable baselineCompute() { 88 Doable doable = new Doable() { 89 @Override 90 public int doWork(int i) { 91 return MethodHandleProxiesAsIFInstance.doWork(i); 92 } 93 }; 94 95 i = doable.doWork(i); // make sure computation happens 96 return null; // let allocation be eliminated 97 } 98 99 @Benchmark 100 public Doable baselineAllocCompute() { 101 Doable doable = new Doable() { 102 @Override 103 public int doWork(int i) { 104 return MethodHandleProxiesAsIFInstance.doWork(i); 105 } 106 }; 107 108 i = doable.doWork(i); // make sure computation happens 109 return doable; // make sure allocation happens 110 } 111 112 public static int doWork(int i) { 113 return i + 1; 114 } 115 116 public interface Doable { 117 int doWork(int i); 118 } 119 120 }