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.lang.reflect.Method;
  37 import java.util.concurrent.TimeUnit;
  38 
  39 /**
  40  * Benchmark to assess basic MethodHandle performance.
  41  */
  42 @BenchmarkMode(Mode.AverageTime)
  43 @OutputTimeUnit(TimeUnit.NANOSECONDS)
  44 @State(Scope.Thread)
  45 public class MethodHandleBasicInvoke {
  46 
  47     /*
  48      * Implementation notes:
  49      *   - this is a very basic test, does not do any parameter conversion (in fact, no parameters at all)
  50      *   - baselines include calling method directly, and doing the same via reflection
  51      *   - baselineRaw is known to be super-fast with good inlining
  52      */
  53 
  54     private int i;
  55     private static MethodHandle mh;
  56     private static Method ref;
  57     private static MethodHandle mhUnreflect;
  58 
  59     @Setup
  60     public void setup() throws Throwable {
  61         mh = MethodHandles.lookup().findVirtual(MethodHandleBasicInvoke.class, "doWork", MethodType.methodType(int.class));
  62 
  63         ref = MethodHandleBasicInvoke.class.getMethod("doWork");
  64         ref.setAccessible(true);
  65 
  66         mhUnreflect = MethodHandles.lookup().unreflect(ref);
  67     }
  68 
  69     @Benchmark
  70     public int baselineRaw() throws Throwable {
  71         return doWork();
  72     }
  73 
  74     @Benchmark
  75     public int baselineReflect() throws Throwable {
  76         return (int) ref.invoke(this);
  77     }
  78 
  79     @Benchmark
  80     public int testMH_Plain_Invoke() throws Throwable {
  81         return (int) mh.invoke(this);
  82     }
  83 
  84     @Benchmark
  85     public int testMH_Plain_Exact() throws Throwable {
  86         return (int) mh.invokeExact(this);
  87     }
  88 
  89     @Benchmark
  90     public int testMH_Unreflect_Invoke() throws Throwable {
  91         return (int) mhUnreflect.invoke(this);
  92     }
  93 
  94     @Benchmark
  95     public int testMH_Unreflect_Exact() throws Throwable {
  96         return (int) mhUnreflect.invokeExact(this);
  97     }
  98 
  99     public int doWork() {
 100         return i++;
 101     }
 102 
 103 }