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.catchException() performance 42 */ 43 @BenchmarkMode(Mode.AverageTime) 44 @OutputTimeUnit(TimeUnit.NANOSECONDS) 45 @State(Scope.Thread) 46 public class MethodHandlesCatchException { 47 48 /** 49 * Implementation notes: 50 * - emulating instance method handles because of current issue with instance methods 51 * (http://monaco.us.oracle.com/detail.jsf?cr=7179751) 52 * - exception is cached to harness the MH code, not exception instantiation 53 * - measuring two modes: a) always going through normal code path; b) always going through exceptional one 54 * - baselines do the same thing in pure Java 55 */ 56 57 private static final MyException MY_EXCEPTION = new MyException(); 58 59 private int i1; 60 private int i2; 61 62 private static MethodHandle methNormal; 63 private static MethodHandle methExceptional; 64 65 @Setup 66 public void setup() throws Throwable { 67 MethodHandle bodyNormal = MethodHandles.lookup().findStatic(MethodHandlesCatchException.class, "doWorkNormal", MethodType.methodType(void.class, MethodHandlesCatchException.class)); 68 MethodHandle bodyExceptional = MethodHandles.lookup().findStatic(MethodHandlesCatchException.class, "doWorkExceptional", MethodType.methodType(void.class, MethodHandlesCatchException.class)); 69 MethodHandle fallback = MethodHandles.lookup().findStatic(MethodHandlesCatchException.class, "fallback", MethodType.methodType(void.class, MyException.class, MethodHandlesCatchException.class)); 70 71 methNormal = MethodHandles.catchException(bodyNormal, MyException.class, fallback); 72 methExceptional = MethodHandles.catchException(bodyExceptional, MyException.class, fallback); 73 } 74 75 @Benchmark 76 public void baselineNormal() { 77 try { 78 doWorkNormal(this); 79 } catch (MyException e) { 80 fallback(e, this); 81 } 82 } 83 84 @Benchmark 85 public void baselineExceptional() { 86 try { 87 doWorkExceptional(this); 88 } catch (MyException e) { 89 fallback(e, this); 90 } 91 } 92 93 @Benchmark 94 public void testNormal() throws Throwable { 95 methNormal.invokeExact(this); 96 } 97 98 @Benchmark 99 public void testExceptional() throws Throwable { 100 methExceptional.invokeExact(this); 101 } 102 103 104 public static void doWorkNormal(MethodHandlesCatchException inst) throws MyException { 105 inst.i1++; 106 } 107 108 public static void doWorkExceptional(MethodHandlesCatchException inst) throws MyException { 109 inst.i1++; 110 throw MY_EXCEPTION; 111 } 112 113 public static void fallback(MyException ex, MethodHandlesCatchException inst) { 114 inst.i2++; 115 } 116 117 public static class MyException extends Exception { 118 119 } 120 121 }