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.filterArguments() performance 42 */ 43 @BenchmarkMode(Mode.AverageTime) 44 @OutputTimeUnit(TimeUnit.NANOSECONDS) 45 @State(Scope.Benchmark) 46 public class MethodHandlesFilterArgs { 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 * - the filter is empty to measure infra costs, not the filter itself 54 * - baselines should be comparable for each method if optimized enough 55 */ 56 57 private MethodHandle orig; 58 private MethodHandle modified1; 59 private MethodHandle modified2; 60 private MethodHandle modified3; 61 62 private volatile Integer arg1 = 42; 63 private volatile Integer arg2 = 43; 64 private volatile Integer arg3 = 44; 65 66 @Setup 67 public void setup() throws Throwable { 68 orig = MethodHandles.lookup().findStatic(MethodHandlesFilterArgs.class, "doWork", MethodType.methodType(int.class, Integer.class, Integer.class, Integer.class)); 69 MethodHandle filter = MethodHandles.lookup().findStatic(MethodHandlesFilterArgs.class, "filter", MethodType.methodType(Integer.class, Integer.class)); 70 modified1 = MethodHandles.filterArguments(orig, 0, filter); 71 modified2 = MethodHandles.filterArguments(orig, 0, filter, filter); 72 modified3 = MethodHandles.filterArguments(orig, 0, filter, filter, filter); 73 } 74 75 @Benchmark 76 public int baselineRaw() throws Throwable { 77 return doWork(arg1, arg2, arg3); 78 } 79 80 @Benchmark 81 public int baselineRawConvert() throws Throwable { 82 return doWork(filter(arg1), filter(arg2), filter(arg3)); 83 } 84 85 @Benchmark 86 public int baselineMH() throws Throwable { 87 return (int) orig.invokeExact(arg1, arg2, arg3); 88 } 89 90 @Benchmark 91 public int baselineMHConvert() throws Throwable { 92 return (int) orig.invokeExact(filter(arg1), filter(arg2), filter(arg3)); 93 } 94 95 @Benchmark 96 public int testInvoke_M1() throws Throwable { 97 return (int) modified1.invokeExact(arg1, arg2, arg3); 98 } 99 100 @Benchmark 101 public int testInvoke_M2() throws Throwable { 102 return (int) modified2.invokeExact(arg1, arg2, arg3); 103 } 104 105 @Benchmark 106 public int testInvoke_M3() throws Throwable { 107 return (int) modified3.invokeExact(arg1, arg2, arg3); 108 } 109 110 public static Integer filter(Integer a) { 111 return a; 112 } 113 114 public static int doWork(Integer a, Integer b, Integer c) { 115 return 31*(31*(31*a + b) + c); 116 } 117 118 }