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 currying with MethodHandle.bindTo() performance 42 */ 43 @BenchmarkMode(Mode.AverageTime) 44 @OutputTimeUnit(TimeUnit.NANOSECONDS) 45 @State(Scope.Thread) 46 public class MethodHandleBindToCurry { 47 48 /* 49 Implementation notes: 50 - calls static method to avoid binding "this" 51 - tests the performance of gradually curried methods, hoping for compiler to optimize 52 - arguments are volatile, to break optimistic CSE happening before the actual call 53 - using invokeExact and Integers to skip argument conversions 54 - baseline includes calling the method directly, and this is known to be super-fast due to inlining 55 */ 56 57 private MethodHandle mhOrig; 58 private MethodHandle mhCurry1; 59 private MethodHandle mhCurry2; 60 private MethodHandle mhCurry3; 61 62 private volatile Integer arg1 = 1; 63 private volatile Integer arg2 = 2; 64 private volatile Integer arg3 = 3; 65 66 @Setup 67 public void setup() throws Throwable { 68 mhOrig = MethodHandles.lookup().findStatic(MethodHandleBindToCurry.class, "doWork", 69 MethodType.methodType(int.class, Integer.class, Integer.class, Integer.class)); 70 mhCurry1 = mhOrig.bindTo(arg1); 71 mhCurry2 = mhCurry1.bindTo(arg2); 72 mhCurry3 = mhCurry2.bindTo(arg3); 73 } 74 75 @Benchmark 76 public int baselineRaw() { 77 return doWork(arg1, arg2, arg3); 78 } 79 80 @Benchmark 81 public int testInvoke_C0() throws Throwable { 82 return (int) mhOrig.invokeExact(arg1, arg2, arg3); 83 } 84 85 @Benchmark 86 public int testInvoke_C1() throws Throwable { 87 return (int) mhCurry1.invokeExact(arg2, arg3); 88 } 89 90 @Benchmark 91 public int testInvoke_C2() throws Throwable { 92 return (int) mhCurry2.invokeExact(arg3); 93 } 94 95 @Benchmark 96 public int testInvoke_C3() throws Throwable { 97 return (int) mhCurry3.invokeExact(); 98 } 99 100 public static int doWork(Integer a, Integer b, Integer c) { 101 return 31*(31*(31*a + b) + c); 102 } 103 104 }