| /* |
| * Copyright (c) 2015, 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 |
| * @requires vm.compMode != "Xcomp" |
| * @summary Verifies behaviour of Unsafe.allocateMemory |
| * @library /test/lib |
| * @modules java.base/jdk.internal.misc |
| * java.management |
| * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:MallocMaxTestWords=100m AllocateMemory |
| */ |
| |
| import jdk.internal.misc.Unsafe; |
| import static jdk.test.lib.Asserts.*; |
| |
| public class AllocateMemory { |
| public static void main(String args[]) throws Exception { |
| Unsafe unsafe = Unsafe.getUnsafe(); |
| |
| // Allocate a byte, write to the location and read back the value |
| long address = unsafe.allocateMemory(1); |
| assertNotEquals(address, 0L); |
| |
| unsafe.putByte(address, Byte.MAX_VALUE); |
| assertEquals(Byte.MAX_VALUE, unsafe.getByte(address)); |
| unsafe.freeMemory(address); |
| |
| // Call to allocateMemory() with a negative value should result in an IllegalArgumentException |
| try { |
| address = unsafe.allocateMemory(-1); |
| throw new RuntimeException("Did not get expected IllegalArgumentException"); |
| } catch (IllegalArgumentException e) { |
| // Expected |
| assertNotEquals(address, 0L); |
| } |
| |
| // allocateMemory() should throw an OutOfMemoryError when the underlying malloc fails, |
| // we test this by limiting the malloc using -XX:MallocMaxTestWords |
| try { |
| address = unsafe.allocateMemory(100 * 1024 * 1024 * 8); |
| } catch (OutOfMemoryError e) { |
| // Expected |
| return; |
| } |
| throw new RuntimeException("Did not get expected OutOfMemoryError"); |
| } |
| } |