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 }