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.MethodHandleProxies;
  37 import java.lang.invoke.MethodHandles;
  38 import java.lang.invoke.MethodType;
  39 import java.util.concurrent.TimeUnit;
  40 
  41 /**
  42  * Benchmark evaluates the performance of MethodHandleProxies.*
  43  */
  44 @BenchmarkMode(Mode.AverageTime)
  45 @OutputTimeUnit(TimeUnit.NANOSECONDS)
  46 @State(Scope.Thread)
  47 public class MethodHandleProxiesAsIFInstance {
  48 
  49     /**
  50      * Implementation notes:
  51      *   - asInterfaceInstance() can only target static MethodHandle (adapters needed to call instance method?)
  52      *   - baselineCompute will quickly degrade to GC test, if escape analysis is unable to spare the allocation
  53      *   - testCreate* will always be slower if allocation is not eliminated; baselineAllocCompute makes sure allocation is present
  54      */
  55 
  56     public int i;
  57 
  58     private MethodHandle target;
  59     private Doable precreated;
  60 
  61     @Setup
  62     public void setup() throws Throwable {
  63         target = MethodHandles.lookup().findStatic(MethodHandleProxiesAsIFInstance.class, "doWork", MethodType.methodType(int.class, int.class));
  64         precreated = MethodHandleProxies.asInterfaceInstance(Doable.class, target);
  65     }
  66 
  67     @Benchmark
  68     public Doable testCreate() {
  69         Doable doable = MethodHandleProxies.asInterfaceInstance(Doable.class, target);
  70         return doable;              // make sure allocation happens
  71     }
  72 
  73     @Benchmark
  74     public Doable testCreateCall() {
  75         Doable doable = MethodHandleProxies.asInterfaceInstance(Doable.class, target);
  76         i = doable.doWork(i);       // make sure computation happens
  77         return null;                // let allocation be eliminated
  78     }
  79 
  80     @Benchmark
  81     public Doable testCall() {
  82         i = precreated.doWork(i);   // make sure computation happens
  83         return precreated;
  84     }
  85 
  86     @Benchmark
  87     public Doable baselineCompute() {
  88         Doable doable = new Doable() {
  89             @Override
  90             public int doWork(int i) {
  91                 return MethodHandleProxiesAsIFInstance.doWork(i);
  92             }
  93         };
  94 
  95         i = doable.doWork(i);       // make sure computation happens
  96         return null;                // let allocation be eliminated
  97     }
  98 
  99     @Benchmark
 100     public Doable baselineAllocCompute() {
 101         Doable doable = new Doable() {
 102             @Override
 103             public int doWork(int i) {
 104                 return MethodHandleProxiesAsIFInstance.doWork(i);
 105             }
 106         };
 107 
 108         i = doable.doWork(i);       // make sure computation happens
 109         return doable;              // make sure allocation happens
 110     }
 111 
 112     public static int doWork(int i) {
 113         return i + 1;
 114     }
 115 
 116     public interface Doable {
 117         int doWork(int i);
 118     }
 119 
 120 }