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 MethodHandles.catchException() performance 40 */ 41 @BenchmarkMode(Mode.AverageTime) 42 @OutputTimeUnit(TimeUnit.NANOSECONDS) 43 @State(Scope.Thread) 44 public class MethodHandlesCatchException { 45 46 /** 47 * Implementation notes: 48 * - emulating instance method handles because of current issue with instance methods 49 * - exception is cached to harness the MH code, not exception instantiation 50 * - measuring two modes: 51 * a) always going through normal code path; 52 * b) always going through exceptional one 53 * - baselines do the same thing in pure Java 54 */ 55 56 private static final MyException MY_EXCEPTION = new MyException(); 57 58 private int i1; 59 private int i2; 60 61 private static MethodHandle methNormal; 62 private static MethodHandle methExceptional; 63 64 @Setup 65 public void setup() throws Throwable { 66 MethodHandle bodyNormal = MethodHandles.lookup() 67 .findStatic(MethodHandlesCatchException.class, "doWorkNormal", 68 MethodType.methodType(void.class, MethodHandlesCatchException.class)); 69 MethodHandle bodyExceptional = MethodHandles.lookup() 70 .findStatic(MethodHandlesCatchException.class, "doWorkExceptional", 71 MethodType.methodType(void.class, MethodHandlesCatchException.class)); 72 MethodHandle fallback = MethodHandles.lookup() 73 .findStatic(MethodHandlesCatchException.class, "fallback", 74 MethodType.methodType(void.class, MyException.class, MethodHandlesCatchException.class)); 75 76 methNormal = MethodHandles.catchException(bodyNormal, MyException.class, fallback); 77 methExceptional = MethodHandles.catchException(bodyExceptional, MyException.class, fallback); 78 } 79 80 @Benchmark 81 public void baselineNormal() { 82 try { 83 doWorkNormal(this); 84 } catch (MyException e) { 85 fallback(e, this); 86 } 87 } 88 89 @Benchmark 90 public void baselineExceptional() { 91 try { 92 doWorkExceptional(this); 93 } catch (MyException e) { 94 fallback(e, this); 95 } 96 } 97 98 @Benchmark 99 public void testNormal() throws Throwable { 100 methNormal.invokeExact(this); 101 } 102 103 @Benchmark 104 public void testExceptional() throws Throwable { 105 methExceptional.invokeExact(this); 106 } 107 108 109 public static void doWorkNormal(MethodHandlesCatchException inst) throws MyException { 110 inst.i1++; 111 } 112 113 public static void doWorkExceptional(MethodHandlesCatchException inst) throws MyException { 114 inst.i1++; 115 throw MY_EXCEPTION; 116 } 117 118 public static void fallback(MyException ex, MethodHandlesCatchException inst) { 119 inst.i2++; 120 } 121 122 public static class MyException extends Exception { 123 124 } 125 126 }