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.util.concurrent.TimeUnit; 37 38 /** 39 * Benchmark assesses runtime argument conversion performance for MethodHandles. 40 * This particular test checks autoboxing conversion. 41 */ 42 @BenchmarkMode(Mode.AverageTime) 43 @OutputTimeUnit(TimeUnit.NANOSECONDS) 44 @State(Scope.Thread) 45 public class MethodHandleConvertBoxing { 46 47 /* 48 * Implementation notes: 49 * 50 * Baseline is invokeExact call, which presumably measures the performance without argument conversion. 51 * 52 * The test is subdivided into three subtests, gradually doing more work: 53 * - 1_Convert: calls MH.asType to do actual conversion 54 * - 2_MTConvert: instantiates MT, and then calls MH.asType to do actual conversion 55 * - 3_Call: calls MH.invoke, requesting argument conversion 56 * 57 * Calling static method as to minimize virtual dispatch overheads. 58 */ 59 60 private Integer valueBoxed; 61 private int valueUnboxed; 62 63 private MethodHandle mh; 64 private MethodType newType; 65 66 @Setup 67 public void setup() throws Throwable { 68 mh = MethodHandles.lookup().findStatic(MethodHandleConvertBoxing.class, "target", MethodType.methodType(int.class, int.class)); 69 newType = MethodType.methodType(int.class, Integer.class); 70 valueBoxed = 42; 71 valueUnboxed = 42; 72 } 73 74 @Benchmark 75 public int baselineExact() throws Throwable { 76 return (int) mh.invokeExact(valueUnboxed); 77 } 78 79 @Benchmark 80 public MethodHandle test_1_Convert() throws Throwable { 81 return mh.asType(newType); 82 } 83 84 @Benchmark 85 public MethodHandle test_2_MTConvert() throws Throwable { 86 return mh.asType(MethodType.methodType(int.class, Integer.class)); 87 } 88 89 @Benchmark 90 public int test_3_Call() throws Throwable { 91 return (int) mh.invoke(valueBoxed); 92 } 93 94 public static int target(int value) { 95 return value + 1; 96 } 97 98 99 }