93 lines
3.0 KiB
Java
93 lines
3.0 KiB
Java
/*
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* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @summary Verifies the behaviour of Unsafe.fieldOffset
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* @library /test/lib
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* @modules java.base/jdk.internal.misc
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* java.management
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* @run main FieldOffset
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*/
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import java.lang.reflect.Field;
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import jdk.internal.misc.Unsafe;
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import java.lang.reflect.*;
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import static jdk.test.lib.Asserts.*;
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public class FieldOffset {
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public static void main(String args[]) throws Exception {
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Unsafe unsafe = Unsafe.getUnsafe();
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Field[] fields = Test.class.getDeclaredFields();
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for (int i = 0; i < fields.length; i++) {
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long offset = unsafe.objectFieldOffset(fields[i]);
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// Ensure we got a valid offset value back
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assertNotEquals(offset, unsafe.INVALID_FIELD_OFFSET);
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// Make sure the field offset is unique
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for (int j = 0; j < i; j++) {
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assertNotEquals(offset, unsafe.objectFieldOffset(fields[j]));
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}
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}
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fields = StaticTest.class.getDeclaredFields();
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for (int i = 0; i < fields.length; i++) {
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long offset = unsafe.staticFieldOffset(fields[i]);
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// Ensure we got a valid offset value back
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assertNotEquals(offset, unsafe.INVALID_FIELD_OFFSET);
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// Make sure the field offset is unique
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for (int j = 0; j < i; j++) {
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assertNotEquals(offset, unsafe.staticFieldOffset(fields[j]));
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}
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}
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}
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class Test {
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boolean booleanField;
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byte byteField;
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char charField;
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double doubleField;
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float floatField;
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int intField;
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long longField;
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Object objectField;
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short shortField;
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}
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static class StaticTest {
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static boolean booleanField;
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static byte byteField;
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static char charField;
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static double doubleField;
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static float floatField;
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static int intField;
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static long longField;
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static Object objectField;
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static short shortField;
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}
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}
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