56 lines
1.8 KiB
Java
56 lines
1.8 KiB
Java
/*
|
|
* Copyright (c) 2021, 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
|
|
* @bug 8273359
|
|
*
|
|
* @modules java.base/jdk.internal.misc:+open
|
|
* @run main/othervm -Xbatch compiler.unsafe.AlignmentGapAccess
|
|
*/
|
|
|
|
package compiler.unsafe;
|
|
|
|
import jdk.internal.misc.Unsafe;
|
|
|
|
public class AlignmentGapAccess {
|
|
private static final Unsafe UNSAFE = Unsafe.getUnsafe();
|
|
|
|
static class A { int fa; }
|
|
static class B extends A { byte fb; }
|
|
|
|
static final long FA_OFFSET = UNSAFE.objectFieldOffset(A.class, "fa");
|
|
static final long FB_OFFSET = UNSAFE.objectFieldOffset(B.class, "fb");
|
|
|
|
static int test(B obj) {
|
|
return UNSAFE.getInt(obj, FB_OFFSET + 1);
|
|
}
|
|
|
|
public static void main(String[] args) {
|
|
for (int i = 0; i < 20_000; i++) {
|
|
test(new B());
|
|
}
|
|
System.out.println("TEST PASSED");
|
|
}
|
|
}
|