1 /* 2 * Copyright (c) 2015, 2016, 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 * @requires vm.compMode != "Xcomp" 27 * @summary Verifies behaviour of Unsafe.allocateMemory 28 * @library /test/lib 29 * @modules java.base/jdk.internal.misc 30 * java.management 31 * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:MallocMaxTestWords=100m AllocateMemory 32 */ 33 34 import jdk.test.lib.Utils; 35 import jdk.internal.misc.Unsafe; 36 import static jdk.test.lib.Asserts.*; 37 38 public class AllocateMemory { 39 public static void main(String args[]) throws Exception { 40 Unsafe unsafe = Utils.getUnsafe(); 41 42 // Allocate a byte, write to the location and read back the value 43 long address = unsafe.allocateMemory(1); 44 assertNotEquals(address, 0L); 45 46 unsafe.putByte(address, Byte.MAX_VALUE); 47 assertEquals(Byte.MAX_VALUE, unsafe.getByte(address)); 48 unsafe.freeMemory(address); 49 50 // Call to allocateMemory() with a negative value should result in an IllegalArgumentException 51 try { 52 address = unsafe.allocateMemory(-1); 53 throw new RuntimeException("Did not get expected IllegalArgumentException"); 54 } catch (IllegalArgumentException e) { 55 // Expected 56 assertNotEquals(address, 0L); 57 } 58 59 // allocateMemory() should throw an OutOfMemoryError when the underlying malloc fails, 60 // we test this by limiting the malloc using -XX:MallocMaxTestWords 61 try { 62 address = unsafe.allocateMemory(100 * 1024 * 1024 * 8); 63 } catch (OutOfMemoryError e) { 64 // Expected 65 return; 66 } 67 throw new RuntimeException("Did not get expected OutOfMemoryError"); 68 } 69 }