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.MethodHandles; 37 import java.lang.invoke.MethodType; 38 import java.lang.reflect.Method; 39 import java.util.concurrent.TimeUnit; 40 41 /** 42 * Benchmark to assess basic MethodHandle performance. 43 */ 44 @BenchmarkMode(Mode.AverageTime) 45 @OutputTimeUnit(TimeUnit.NANOSECONDS) 46 @State(Scope.Thread) 47 public class MethodHandleBasicInvoke { 48 49 /* 50 * Implementation notes: 51 * - this is a very basic test, does not do any parameter conversion (in fact, no parameters at all) 52 * - baselines include calling method directly, and doing the same via reflection 53 * - baselineRaw is known to be super-fast with good inlining 54 */ 55 56 private int i; 57 private static MethodHandle mh; 58 private static Method ref; 59 private static MethodHandle mhUnreflect; 60 61 @Setup 62 public void setup() throws Throwable { 63 mh = MethodHandles.lookup().findVirtual(MethodHandleBasicInvoke.class, "doWork", MethodType.methodType(int.class)); 64 65 ref = MethodHandleBasicInvoke.class.getMethod("doWork"); 66 ref.setAccessible(true); 67 68 mhUnreflect = MethodHandles.lookup().unreflect(ref); 69 } 70 71 @Benchmark 72 public int baselineRaw() throws Throwable { 73 return doWork(); 74 } 75 76 @Benchmark 77 public int baselineReflect() throws Throwable { 78 return (int) ref.invoke(this); 79 } 80 81 @Benchmark 82 public int testMH_Plain_Invoke() throws Throwable { 83 return (int) mh.invoke(this); 84 } 85 86 @Benchmark 87 public int testMH_Plain_Exact() throws Throwable { 88 return (int) mh.invokeExact(this); 89 } 90 91 @Benchmark 92 public int testMH_Unreflect_Invoke() throws Throwable { 93 return (int) mhUnreflect.invoke(this); 94 } 95 96 @Benchmark 97 public int testMH_Unreflect_Exact() throws Throwable { 98 return (int) mhUnreflect.invokeExact(this); 99 } 100 101 public int doWork() { 102 return i++; 103 } 104 105 }