Mercurial > hg > graal-compiler
view test/compiler/unsafe/GetUnsafeObjectG1PreBarrier.java @ 15226:f1c66b738dae
mx: refactored archive command
author | Doug Simon <doug.simon@oracle.com> |
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date | Fri, 18 Apr 2014 13:36:48 +0200 |
parents | 71526a36ebb4 |
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/* * Copyright (c) 2013, 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 8016474 * @summary The bug only happens with C1 and G1 using a different ObjectAlignmentInBytes than KlassAlignmentInBytes (which is 8) * @run main/othervm -Xbatch -XX:+IgnoreUnrecognizedVMOptions -XX:ObjectAlignmentInBytes=32 GetUnsafeObjectG1PreBarrier */ import java.lang.reflect.Field; import sun.misc.Unsafe; public class GetUnsafeObjectG1PreBarrier { private static final Unsafe unsafe; private static final int N = 100_000; static { try { Field theUnsafe = Unsafe.class.getDeclaredField("theUnsafe"); theUnsafe.setAccessible(true); unsafe = (Unsafe) theUnsafe.get(null); } catch (NoSuchFieldException | IllegalAccessException e) { throw new IllegalStateException(e); } } public Object a; public static void main(String[] args) throws Throwable { new GetUnsafeObjectG1PreBarrier(); } public GetUnsafeObjectG1PreBarrier() throws Throwable { doit(); } private void doit() throws Throwable { Field field = GetUnsafeObjectG1PreBarrier.class.getField("a"); long fieldOffset = unsafe.objectFieldOffset(field); for (int i = 0; i < N; i++) { readField(this, fieldOffset); } } private void readField(Object o, long fieldOffset) { unsafe.getObject(o, fieldOffset); } }