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 }