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 MethodHandle.bindTo() binding performance
  40  */
  41 @BenchmarkMode(Mode.AverageTime)
  42 @OutputTimeUnit(TimeUnit.NANOSECONDS)
  43 @State(Scope.Thread)
  44 public class MethodHandleBindToBinding {
  45 
  46     /*
  47        Implementation notes:
  48           - calls static method to avoid binding "this"
  49           - tests binding costs with multiple depth (C1, C2, C3)
  50           - baseline includes naive side effect store
  51           - lowering the binding cost will minimise both the spread between C1/C2/C3 and difference towards baseline
  52           - this test performance will never reach the baseline
  53      */
  54 
  55     private MethodHandle mhOrig;
  56 
  57     @Setup
  58     public void setup() throws Throwable {
  59         mhOrig = MethodHandles.lookup().findStatic(MethodHandleBindToBinding.class, "doWork",
  60                 MethodType.methodType(Integer.class, Integer.class, Integer.class, Integer.class));
  61     }
  62 
  63     @Benchmark
  64     public Object baselineRaw() {
  65         return mhOrig;
  66     }
  67 
  68     @Benchmark
  69     public Object testBind_C1() throws Throwable {
  70         MethodHandle mhCurry1 = mhOrig.bindTo(1);
  71         return mhCurry1;
  72     }
  73 
  74     @Benchmark
  75     public Object testBind_C2() throws Throwable {
  76         MethodHandle mhCurry1 = mhOrig.bindTo(1);
  77         MethodHandle mhCurry2 = mhCurry1.bindTo(2);
  78         return mhCurry2;
  79     }
  80 
  81     @Benchmark
  82     public Object testBind_C3() throws Throwable {
  83         MethodHandle mhCurry1 = mhOrig.bindTo(1);
  84         MethodHandle mhCurry2 = mhCurry1.bindTo(2);
  85         MethodHandle mhCurry3 = mhCurry2.bindTo(3);
  86         return mhCurry3;
  87     }
  88 
  89     public static Integer doWork(Integer a, Integer b, Integer c) {
  90         return 31*(31*(31*a + b) + c);
  91     }
  92 
  93 }