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.util.concurrent.TimeUnit; 39 40 /** 41 * Benchmark assesses MethodHandles.dropArguments() performance 42 */ 43 @BenchmarkMode(Mode.AverageTime) 44 @OutputTimeUnit(TimeUnit.NANOSECONDS) 45 @State(Scope.Benchmark) 46 public class MethodHandlesDropArguments { 47 48 /** 49 * Implementation notes: 50 * - calling static method to have consistent arg list without receiver type 51 * - using volatile ints as arguments to prevent opportunistic optimizations 52 * - using Integers to limit argument conversion costs 53 */ 54 55 private MethodHandle orig; 56 private MethodHandle modified; 57 58 private volatile Integer arg1 = 42; 59 private volatile Integer arg2 = 43; 60 private volatile Integer arg3 = 44; 61 62 @Setup 63 public void setup() throws Throwable { 64 orig = MethodHandles.lookup().findStatic(MethodHandlesDropArguments.class, "doWork", MethodType.methodType(int.class, Integer.class, Integer.class, Integer.class)); 65 modified = MethodHandles.dropArguments(orig, 0, int.class); 66 } 67 68 @Benchmark 69 public int baselineRaw() throws Throwable { 70 return doWork(arg1, arg2, arg3); 71 } 72 73 @Benchmark 74 public int baselineMH() throws Throwable { 75 return (int) orig.invokeExact(arg1, arg2, arg3); 76 } 77 78 @Benchmark 79 public int testInvoke() throws Throwable { 80 return (int) modified.invokeExact(0, arg1, arg2, arg3); 81 } 82 83 @Benchmark 84 public MethodHandle interCreate() throws Throwable { 85 return MethodHandles.dropArguments(orig, 0, int.class); 86 } 87 88 public static int doWork(Integer a, Integer b, Integer c) { 89 return 31*(31*(31*a + b) + c); 90 } 91 92 }