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.exactInvoker() performance
  40  */
  41 @BenchmarkMode(Mode.AverageTime)
  42 @OutputTimeUnit(TimeUnit.NANOSECONDS)
  43 @State(Scope.Benchmark)
  44 public class MethodHandlesExactInvoker {
  45 
  46     /**
  47      * Implementation notes:
  48      *   - calling static method to have consistent arg list without receiver type
  49      *   - using volatile ints as arguments to prevent opportunistic optimizations
  50      *   - using Integers to limit argument conversion costs
  51      *   - tested method should perform no worse than the baseline
  52      */
  53 
  54     private MethodHandle mhOrig;
  55     private MethodHandle mnInvoke;
  56 
  57     private volatile Integer arg1 = 42;
  58     private volatile Integer arg2 = 43;
  59     private volatile Integer arg3 = 44;
  60 
  61     @Setup
  62     public void setup() throws Throwable {
  63         MethodType mt = MethodType.methodType(int.class, Integer.class, Integer.class, Integer.class);
  64         mhOrig = MethodHandles.lookup().findStatic(MethodHandlesInsertArguments.class, "doWork", mt);
  65         mnInvoke = MethodHandles.exactInvoker(mt);
  66     }
  67 
  68     @Benchmark
  69     public int baselineOrig() throws Throwable {
  70         return (int) mhOrig.invokeExact(arg1, arg2, arg3);
  71     }
  72 
  73     @Benchmark
  74     public int testInvoker() throws Throwable {
  75         return (int) mnInvoke.invokeExact(mhOrig, arg1, arg2, arg3);
  76     }
  77 
  78     public static int doWork(Integer a, Integer b, Integer c) {
  79         return 31*(31*(31*a + b) + c);
  80     }
  81 }