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  * Microbenchmark assesses MethodHandle.asSpreader() performance

    40  */

    41 @BenchmarkMode(Mode.AverageTime)

    42 @OutputTimeUnit(TimeUnit.NANOSECONDS)

    43 @State(Scope.Thread)

    44 public class MethodHandleAsSpreader {

    45 

    46     /*

    47     * Implementation notes:

    48     *   - simple array-parameter method is being called

    49     *   - baselineRaw calls method directly with dynamically instantiating the array

    50     *   - baselineCached calls method directly with pre-cached array

    51     *   - additional testCreate() test harnesses the collector acquisition performance

    52     *   - testCollector() can be faster than both baselines: it can wrapping array at all

    53     */

    54 

    55     public int i;

    56     private static MethodHandle mh;

    57     private static MethodHandle spreaderMH;

    58     private static int[] cachedArgs;

    59 

    60     @Setup

    61     public void setup() throws IllegalAccessException, NoSuchMethodException {

    62         mh = MethodHandles.lookup().findVirtual(MethodHandleAsSpreader.class, "doWork", MethodType.methodType(void.class, int.class, int.class, int.class, int.class, int.class));

    63         spreaderMH = mh.asSpreader(int[].class, 5);

    64         cachedArgs = new int[]{1, 2, 3, 4, 5};

    65     }

    66 

    67     @Benchmark

    68     public void baselineMH() throws Throwable {

    69         mh.invokeExact(this, 1, 2, 3, 4, 5);

    70     }

    71 

    72     @Benchmark

    73     public void baselineRaw() throws Throwable {

    74         doWork(1, 2, 3, 4, 5);

    75     }

    76 

    77     @Benchmark

    78     public MethodHandle testCreate() {

    79         return mh.asSpreader(int[].class, 5);

    80     }

    81 

    82     @Benchmark

    83     public void testSpreader() throws Throwable {

    84         spreaderMH.invokeExact(this, new int[] { 1, 2, 3, 4, 5 });

    85     }

    86 

    87     @Benchmark

    88     public void testSpreaderCached() throws Throwable {

    89         spreaderMH.invokeExact(this, cachedArgs);

    90     }

    91 

    92     public void doWork(int arg1, int arg2, int arg3, int arg4, int arg5) {

    93         i += (arg1 + arg2 + arg3 + arg4 + arg5);

    94     }

    95 

    96 }