• file
• revisions
• annotate
• diff
• comparison
• raw

test/compiler/unsafe/GetUnsafeObjectG1PreBarrier.java@49b5160951dd (annotated)

test/compiler/unsafe/GetUnsafeObjectG1PreBarrier.java

Thu, 17 Apr 2014 16:09:08 -0700

author

amurillo

date

Thu, 17 Apr 2014 16:09:08 -0700

changeset 6635

49b5160951dd

parent 5490

71526a36ebb4

child 6876

710a3c8b516e

permissions

-rw-r--r--

Added tag hs25.20-b11 for changeset b6a2ba7d3ea7

twisti@5486	1	/*
twisti@5486	2	* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
twisti@5486	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
twisti@5486	4	*
twisti@5486	5	* This code is free software; you can redistribute it and/or modify it
twisti@5486	6	* under the terms of the GNU General Public License version 2 only, as
twisti@5486	7	* published by the Free Software Foundation.
twisti@5486	8	*
twisti@5486	9	* This code is distributed in the hope that it will be useful, but WITHOUT
twisti@5486	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
twisti@5486	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
twisti@5486	12	* version 2 for more details (a copy is included in the LICENSE file that
twisti@5486	13	* accompanied this code).
twisti@5486	14	*
twisti@5486	15	* You should have received a copy of the GNU General Public License version
twisti@5486	16	* 2 along with this work; if not, write to the Free Software Foundation,
twisti@5486	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
twisti@5486	18	*
twisti@5486	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
twisti@5486	20	* or visit www.oracle.com if you need additional information or have any
twisti@5486	21	* questions.
twisti@5486	22	*/
twisti@5486	23
twisti@5486	24	/*
twisti@5486	25	* @test
twisti@5486	26	* @bug 8016474
twisti@5486	27	* @summary The bug only happens with C1 and G1 using a different ObjectAlignmentInBytes than KlassAlignmentInBytes (which is 8)
twisti@5490	28	* @run main/othervm -Xbatch -XX:+IgnoreUnrecognizedVMOptions -XX:ObjectAlignmentInBytes=32 GetUnsafeObjectG1PreBarrier
twisti@5486	29	*/
twisti@5486	30
twisti@5486	31	import java.lang.reflect.Field;
twisti@5486	32
twisti@5486	33	import sun.misc.Unsafe;
twisti@5486	34
twisti@5486	35	public class GetUnsafeObjectG1PreBarrier {
twisti@5486	36	private static final Unsafe unsafe;
twisti@5486	37	private static final int N = 100_000;
twisti@5486	38
twisti@5486	39	static {
twisti@5486	40	try {
twisti@5486	41	Field theUnsafe = Unsafe.class.getDeclaredField("theUnsafe");
twisti@5486	42	theUnsafe.setAccessible(true);
twisti@5486	43	unsafe = (Unsafe) theUnsafe.get(null);
twisti@5486	44	} catch (NoSuchFieldException | IllegalAccessException e) {
twisti@5486	45	throw new IllegalStateException(e);
twisti@5486	46	}
twisti@5486	47	}
twisti@5486	48
twisti@5486	49	public Object a;
twisti@5486	50
twisti@5486	51	public static void main(String[] args) throws Throwable {
twisti@5486	52	new GetUnsafeObjectG1PreBarrier();
twisti@5486	53	}
twisti@5486	54
twisti@5486	55	public GetUnsafeObjectG1PreBarrier() throws Throwable {
twisti@5486	56	doit();
twisti@5486	57	}
twisti@5486	58
twisti@5486	59	private void doit() throws Throwable {
twisti@5486	60	Field field = GetUnsafeObjectG1PreBarrier.class.getField("a");
twisti@5486	61	long fieldOffset = unsafe.objectFieldOffset(field);
twisti@5486	62
twisti@5486	63	for (int i = 0; i < N; i++) {
twisti@5486	64	readField(this, fieldOffset);
twisti@5486	65	}
twisti@5486	66	}
twisti@5486	67
twisti@5486	68	private void readField(Object o, long fieldOffset) {
twisti@5486	69	unsafe.getObject(o, fieldOffset);
twisti@5486	70	}
twisti@5486	71	}