/*
 * Copyright (c) 2017, Red Hat Inc. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package org.openjdk.gcbench.runtime.arraycopy;

import org.openjdk.jmh.annotations.*;

import java.util.Arrays;
import java.util.concurrent.TimeUnit;

@Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
@Fork(1)
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Threads(1)
@State(Scope.Thread)
public class RefArray {

    public static final int SIZE = 64;

    Object[] sourceNulls, sourceObjs;

    @Setup
    public void setup() {
        sourceNulls = new Object[SIZE];
        sourceObjs = new Object[SIZE];
        for (int c = 0; c < SIZE; c++) {
            sourceObjs[c] = new Object();
        }
    }

    private Object doCopy(Object[] src, int size) {
        Object[] dst = new Object[size];
        System.arraycopy(src, 0, dst, 0, size);
        return dst;
    }

    @Benchmark
    public Object nulls_01() {
        return doCopy(sourceNulls, 1);
    }

    @Benchmark
    public Object nulls_02() {
        return doCopy(sourceNulls, 2);
    }

    @Benchmark
    public Object nulls_04() {
        return doCopy(sourceNulls, 4);
    }

    @Benchmark
    public Object nulls_08() {
        return doCopy(sourceNulls, 8);
    }

    @Benchmark
    public Object nulls_16() {
        return doCopy(sourceNulls, 16);
    }

    @Benchmark
    public Object nulls_32() {
        return doCopy(sourceNulls, 32);
    }

    @Benchmark
    public Object nulls_64() {
        return doCopy(sourceNulls, 64);
    }

    @Benchmark
    public Object objs_01() {
        return doCopy(sourceObjs, 1);
    }

    @Benchmark
    public Object objs_02() {
        return doCopy(sourceObjs, 2);
    }

    @Benchmark
    public Object objs_04() {
        return doCopy(sourceObjs, 4);
    }

    @Benchmark
    public Object objs_08() {
        return doCopy(sourceObjs, 8);
    }

    @Benchmark
    public Object objs_16() {
        return doCopy(sourceObjs, 16);
    }

    @Benchmark
    public Object objs_32() {
        return doCopy(sourceObjs, 32);
    }

    @Benchmark
    public Object objs_64() {
        return doCopy(sourceObjs, 64);
    }

}