78 lines
2.5 KiB
Java
78 lines
2.5 KiB
Java
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/*
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* Copyright (c) 2015, 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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/*
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* @test
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* @bug 8143930
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* @summary C1 LinearScan asserts when compiling two back-to-back CompareAndSwapLongs
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* @modules java.base/jdk.internal.misc
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* @run testng/othervm -Diters=200000 -XX:TieredStopAtLevel=1 UnsafeTwoCASLong
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*/
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import org.testng.annotations.Test;
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import java.lang.reflect.Field;
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import static org.testng.Assert.*;
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public class UnsafeTwoCASLong {
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static final int ITERS = Integer.getInteger("iters", 1);
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static final jdk.internal.misc.Unsafe UNSAFE;
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static final long V_OFFSET;
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static {
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try {
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Field f = jdk.internal.misc.Unsafe.class.getDeclaredField("theUnsafe");
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f.setAccessible(true);
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UNSAFE = (jdk.internal.misc.Unsafe) f.get(null);
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} catch (Exception e) {
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throw new RuntimeException("Unable to get Unsafe instance.", e);
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}
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try {
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Field vField = UnsafeTwoCASLong.class.getDeclaredField("v");
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V_OFFSET = UNSAFE.objectFieldOffset(vField);
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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long v;
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@Test
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public void testFieldInstance() {
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UnsafeTwoCASLong t = new UnsafeTwoCASLong();
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for (int c = 0; c < ITERS; c++) {
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testAccess(t, V_OFFSET);
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}
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}
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static void testAccess(Object base, long offset) {
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UNSAFE.compareAndSwapLong(base, offset, 1L, 2L);
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UNSAFE.compareAndSwapLong(base, offset, 2L, 1L);
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}
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}
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