/*

 * Copyright (c) 2018, Red Hat, Inc. All rights reserved.

 *

 * 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 TestAllocLargeObj

 * @summary Test allocation of small object to result OOM, but not to crash JVM

 * @key gc

 * @requires vm.gc.Shenandoah

 * @library /test/lib

 * @run main TestAllocLargeObj

 */

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.process.ProcessTools;

public class TestAllocLargeObj {

    static final int SIZE = 1 * 1024 * 1024;

    static final int COUNT = 16;

    static volatile Object sink;

    public static void work() throws Exception {

        Object[] root = new Object[COUNT];

        sink = root;

        for (int c = 0; c < COUNT; c++) {

            root[c] = new Object[SIZE];

        }

    }

    public static void main(String[] args) throws Exception {

        if (args.length > 0) {

            work();

            return;

        }

        {

            ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

                    "-Xmx16m",

                    "-XX:+UnlockExperimentalVMOptions",

                    "-XX:+UseShenandoahGC",

                    TestAllocLargeObj.class.getName(),

                    "test");

            OutputAnalyzer analyzer = new OutputAnalyzer(pb.start());

            analyzer.shouldHaveExitValue(1);

            analyzer.shouldContain("java.lang.OutOfMemoryError: Java heap space");

        }

        {

            ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

                    "-Xmx1g",

                    "-XX:+UnlockExperimentalVMOptions",

                    "-XX:+UseShenandoahGC",

                    TestAllocLargeObj.class.getName(),

                    "test");

            OutputAnalyzer analyzer = new OutputAnalyzer(pb.start());

            analyzer.shouldHaveExitValue(0);

            analyzer.shouldNotContain("java.lang.OutOfMemoryError: Java heap space");

        }

    }

}