1 /*

     2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 /*

    25  * @test

    26  * @summary Verifies behaviour of Unsafe.allocateMemory

    27  * @library /testlibrary

    28  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:MallocMaxTestWords=20m AllocateMemory

    29  */

    30 

    31 import com.oracle.java.testlibrary.*;

    32 import sun.misc.Unsafe;

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

    34 

    35 public class AllocateMemory {

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

    37         Unsafe unsafe = Utils.getUnsafe();

    38 

    39         // Allocate a byte, write to the location and read back the value

    40         long address = unsafe.allocateMemory(1);

    41         assertNotEquals(address, 0L);

    42 

    43         unsafe.putByte(address, Byte.MAX_VALUE);

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

    45         unsafe.freeMemory(address);

    46 

    47         // Call to allocateMemory() with a negative value should result in an IllegalArgumentException

    48         try {

    49             address = unsafe.allocateMemory(-1);

    50             throw new RuntimeException("Did not get expected IllegalArgumentException");

    51         } catch (IllegalArgumentException e) {

    52             // Expected

    53             assertNotEquals(address, 0L);

    54         }

    55 

    56         // allocateMemory() should throw an OutOfMemoryError when the underlying malloc fails,

    57         // we test this by limiting the malloc using -XX:MallocMaxTestWords

    58         try {

    59             address = unsafe.allocateMemory(20 * 1024 * 1024 * 8);

    60         } catch (OutOfMemoryError e) {

    61             // Expected

    62             return;

    63         }

    64         throw new RuntimeException("Did not get expected OutOfMemoryError");

    65     }

    66 }