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 the behaviour of Unsafe.allocateInstance 27 * @library /test/lib 28 * @modules java.base/jdk.internal.misc 29 * java.management 30 * @run main AllocateInstance 31 */ 32 33 import jdk.test.lib.Utils; 34 import jdk.internal.misc.Unsafe; 35 import static jdk.test.lib.Asserts.*; 36 37 public class AllocateInstance { 38 static final Unsafe UNSAFE = Utils.getUnsafe(); 39 40 class TestClass { 41 public boolean calledConstructor = false; 42 43 public TestClass() { 44 calledConstructor = true; 45 } 46 } 47 48 static void testConstructorCall() throws InstantiationException { 49 // allocateInstance() should not result in a call to the constructor 50 TestClass tc = (TestClass)UNSAFE.allocateInstance(TestClass.class); 51 assertFalse(tc.calledConstructor); 52 } 53 54 abstract class AbstractClass { 55 public AbstractClass() {} 56 } 57 58 static void testAbstractClass() { 59 try { 60 AbstractClass ac = (AbstractClass) UNSAFE.allocateInstance(AbstractClass.class); 61 throw new AssertionError("Should throw InstantiationException for an abstract class"); 62 } catch (InstantiationException e) { 63 // Expected 64 } 65 } 66 67 interface AnInterface {} 68 69 static void testInterface() { 70 try { 71 AnInterface ai = (AnInterface) UNSAFE.allocateInstance(AnInterface.class); 72 throw new AssertionError("Should throw InstantiationException for an interface"); 73 } catch (InstantiationException e) { 74 // Expected 75 } 76 } 77 78 public static void main(String args[]) throws Exception { 79 for (int i = 0; i < 20_000; i++) { 80 testConstructorCall(); 81 testAbstractClass(); 82 testInterface(); 83 } 84 } 85 }