/*

 * Copyright (c) 2015, 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

 * @bug 8058897

 * @library /testlibrary

 */

import com.oracle.java.testlibrary.*;

import sun.misc.Unsafe;

import static com.oracle.java.testlibrary.Asserts.*;

public class Reallocate {

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

        Unsafe unsafe = Utils.getUnsafe();

        long address = unsafe.allocateMemory(1);

        assertNotEquals(address, 0L);

        // Make sure we reallocate correctly

        unsafe.putByte(address, Byte.MAX_VALUE);

        address = unsafe.reallocateMemory(address, 2);

        assertNotEquals(address, 0L);

        assertEquals(unsafe.getByte(address), Byte.MAX_VALUE);

        // Reallocating with a 0 size should return a null pointer

        address = unsafe.reallocateMemory(address, 0);

        assertEquals(address, 0L);

        // Reallocating with a null pointer should result in a normal allocation

        address = unsafe.reallocateMemory(0L, 1);

        assertNotEquals(address, 0L);

        unsafe.putByte(address, Byte.MAX_VALUE);

        assertEquals(unsafe.getByte(address), Byte.MAX_VALUE);

        // Make sure we can throw an OOME when we fail to reallocate due to OOM

        try {

        } catch (OutOfMemoryError e) {

            // Expected

            return;

        }

        throw new RuntimeException("Did not get expected OOM");

    }

}