| /* |
| * Copyright (c) 2015, 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 |
| * @summary Verifies the behaviour of Unsafe.fieldOffset |
| * @library /testlibrary |
| * @modules java.base/sun.misc |
| * java.management |
| * @run main FieldOffset |
| */ |
| |
| import java.lang.reflect.Field; |
| import com.oracle.java.testlibrary.*; |
| import sun.misc.Unsafe; |
| import java.lang.reflect.*; |
| import static com.oracle.java.testlibrary.Asserts.*; |
| |
| public class FieldOffset { |
| public static void main(String args[]) throws Exception { |
| Unsafe unsafe = Utils.getUnsafe(); |
| Field[] fields = Test.class.getDeclaredFields(); |
| |
| for (int i = 0; i < fields.length; i++) { |
| long offset = unsafe.objectFieldOffset(fields[i]); |
| // Ensure we got a valid offset value back |
| assertNotEquals(offset, unsafe.INVALID_FIELD_OFFSET); |
| |
| // Make sure the field offset is unique |
| for (int j = 0; j < i; j++) { |
| assertNotEquals(offset, unsafe.objectFieldOffset(fields[j])); |
| } |
| } |
| |
| fields = StaticTest.class.getDeclaredFields(); |
| for (int i = 0; i < fields.length; i++) { |
| long offset = unsafe.staticFieldOffset(fields[i]); |
| // Ensure we got a valid offset value back |
| assertNotEquals(offset, unsafe.INVALID_FIELD_OFFSET); |
| |
| // Make sure the field offset is unique |
| for (int j = 0; j < i; j++) { |
| assertNotEquals(offset, unsafe.staticFieldOffset(fields[j])); |
| } |
| } |
| |
| } |
| |
| class Test { |
| boolean booleanField; |
| byte byteField; |
| char charField; |
| double doubleField; |
| float floatField; |
| int intField; |
| long longField; |
| Object objectField; |
| short shortField; |
| } |
| |
| static class StaticTest { |
| static boolean booleanField; |
| static byte byteField; |
| static char charField; |
| static double doubleField; |
| static float floatField; |
| static int intField; |
| static long longField; |
| static Object objectField; |
| static short shortField; |
| } |
| |
| } |