/*

 * Copyright (c) 2014 Oracle and/or its affiliates. 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.

 *

 * 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.bench.vm.gc;

import org.openjdk.jmh.annotations.Benchmark;

import org.openjdk.jmh.annotations.BenchmarkMode;

import org.openjdk.jmh.annotations.Mode;

import org.openjdk.jmh.annotations.OutputTimeUnit;

import org.openjdk.jmh.annotations.Scope;

import org.openjdk.jmh.annotations.State;

import org.openjdk.jmh.infra.Blackhole;

import java.util.concurrent.TimeUnit;

@BenchmarkMode(Mode.AverageTime)

@OutputTimeUnit(TimeUnit.NANOSECONDS)

@State(Scope.Thread)

public class Alloc {

    public static final int LENGTH = 400;

    public static final int ARR_LEN = 100;

    public int largeLen = 100;

    public int smalllen = 6;

    @Benchmark

    public void testLargeConstArray(Blackhole bh) throws Exception {

        int localArrlen = ARR_LEN;

        for (int i = 0; i < LENGTH; i++) {

            Object[] tmp = new Object[localArrlen];

            bh.consume(tmp);

        }

    }

    @Benchmark

    public void testLargeVariableArray(Blackhole bh) throws Exception {

        int localArrlen = largeLen;

        for (int i = 0; i < LENGTH; i++) {

            Object[] tmp = new Object[localArrlen];

            bh.consume(tmp);

        }

    }

    @Benchmark

    public void testSmallConstArray(Blackhole bh) throws Exception {

        int localArrlen = largeLen;

        for (int i = 0; i < LENGTH; i++) {

            Object[] tmp = new Object[localArrlen];

            bh.consume(tmp);

        }

    }

    @Benchmark

    public void testSmallObject(Blackhole bh) throws Exception {

        FortyBytes localDummy = null;

        for (int i = 0; i < LENGTH; i++) {

            FortyBytes tmp = new FortyBytes();

            tmp.next = localDummy;

            localDummy = tmp;

            bh.consume(tmp);

        }

    }

    @Benchmark

    public void testSmallVariableArray(Blackhole bh) throws Exception {

        int localArrlen = smalllen;

        for (int i = 0; i < LENGTH; i++) {

            Object[] tmp = new Object[localArrlen];

            bh.consume(tmp);

        }

    }

    final class FortyBytes {

        Object next;

        int y, z, k, f, g, e, t;

    }

}