/*

 * Copyright (c) 2014, 2016, 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.

 */

/*

 * @test RandomAllocationTest

 * @key stress

 * @summary stressing code cache by allocating randomly sized "dummy" code blobs

 * @library /test/lib /

 * @modules java.base/jdk.internal.misc

 *          java.management

 *

 * @build sun.hotspot.WhiteBox

 * @run driver ClassFileInstaller sun.hotspot.WhiteBox

 *                                sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions

 *                   -XX:+WhiteBoxAPI

 *                   -XX:CompileCommand=dontinline,compiler.codecache.stress.Helper$TestCase::method

 *                   -XX:-SegmentedCodeCache

 *                   compiler.codecache.stress.RandomAllocationTest

 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions

 *                   -XX:+WhiteBoxAPI

 *                   -XX:CompileCommand=dontinline,compiler.codecache.stress.Helper$TestCase::method

 *                   -XX:+SegmentedCodeCache

 *                   compiler.codecache.stress.RandomAllocationTest

 */

package compiler.codecache.stress;

import sun.hotspot.code.BlobType;

import java.util.ArrayList;

public class RandomAllocationTest implements Runnable {

    private static final long CODE_CACHE_SIZE

            = Helper.WHITE_BOX.getUintxVMFlag("ReservedCodeCacheSize");

    private static final int MAX_BLOB_SIZE = (int) (CODE_CACHE_SIZE >> 7);

    private static final BlobType[] BLOB_TYPES

            = BlobType.getAvailable().toArray(new BlobType[0]);

    public static void main(String[] args) {

        new CodeCacheStressRunner(new RandomAllocationTest()).runTest();

    }

    private final ArrayList<Long> blobs = new ArrayList<>();

    @Override

    public void run() {

        boolean allocate = blobs.isEmpty() || Helper.RNG.nextBoolean();

        if (allocate) {

            int type = Helper.RNG.nextInt(BLOB_TYPES.length);

            long addr = Helper.WHITE_BOX.allocateCodeBlob(

                    Helper.RNG.nextInt(MAX_BLOB_SIZE), BLOB_TYPES[type].id);

            if (addr != 0) {

                blobs.add(addr);

            }

        } else {

            int index = Helper.RNG.nextInt(blobs.size());

            Helper.WHITE_BOX.freeCodeBlob(blobs.remove(index));

        }

    }

}