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. 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.invoke; 24 25 import org.openjdk.jmh.annotations.Benchmark; 26 import org.openjdk.jmh.annotations.BenchmarkMode; 27 import org.openjdk.jmh.annotations.Mode; 28 import org.openjdk.jmh.annotations.OutputTimeUnit; 29 import org.openjdk.jmh.annotations.Scope; 30 import org.openjdk.jmh.annotations.Setup; 31 import org.openjdk.jmh.annotations.State; 32 33 import java.lang.invoke.MethodHandle; 34 import java.lang.invoke.MethodHandles; 35 import java.lang.invoke.MethodType; 36 import java.lang.reflect.Method; 37 import java.util.concurrent.TimeUnit; 38 39 /** 40 * Benchmark to assess basic MethodHandle performance. 41 */ 42 @BenchmarkMode(Mode.AverageTime) 43 @OutputTimeUnit(TimeUnit.NANOSECONDS) 44 @State(Scope.Thread) 45 public class MethodHandleBasicInvoke { 46 47 /* 48 * Implementation notes: 49 * - this is a very basic test, does not do any parameter conversion (in fact, no parameters at all) 50 * - baselines include calling method directly, and doing the same via reflection 51 * - baselineRaw is known to be super-fast with good inlining 52 */ 53 54 private int i; 55 private static MethodHandle mh; 56 private static Method ref; 57 private static MethodHandle mhUnreflect; 58 59 @Setup 60 public void setup() throws Throwable { 61 mh = MethodHandles.lookup().findVirtual(MethodHandleBasicInvoke.class, "doWork", MethodType.methodType(int.class)); 62 63 ref = MethodHandleBasicInvoke.class.getMethod("doWork"); 64 ref.setAccessible(true); 65 66 mhUnreflect = MethodHandles.lookup().unreflect(ref); 67 } 68 69 @Benchmark 70 public int baselineRaw() throws Throwable { 71 return doWork(); 72 } 73 74 @Benchmark 75 public int baselineReflect() throws Throwable { 76 return (int) ref.invoke(this); 77 } 78 79 @Benchmark 80 public int testMH_Plain_Invoke() throws Throwable { 81 return (int) mh.invoke(this); 82 } 83 84 @Benchmark 85 public int testMH_Plain_Exact() throws Throwable { 86 return (int) mh.invokeExact(this); 87 } 88 89 @Benchmark 90 public int testMH_Unreflect_Invoke() throws Throwable { 91 return (int) mhUnreflect.invoke(this); 92 } 93 94 @Benchmark 95 public int testMH_Unreflect_Exact() throws Throwable { 96 return (int) mhUnreflect.invokeExact(this); 97 } 98 99 public int doWork() { 100 return i++; 101 } 102 103 }