70 lines
2.3 KiB
Java
70 lines
2.3 KiB
Java
/*
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* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2016, Red Hat, Inc. 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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* @bug 8167298
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* @summary Unsafe.compareAndExchangeReference should keep track of returned type after matching
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* @modules java.base/jdk.internal.misc
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* @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-BackgroundCompilation -XX:-UseOnStackReplacement -XX:-UseCompressedOops TestCAEAntiDep
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*
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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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public class TestCAEAntiDep {
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static final jdk.internal.misc.Unsafe UNSAFE = Unsafe.getUnsafe();
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static final long O_OFFSET;
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static class C {
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int f1;
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}
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C o = new C();
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static {
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try {
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Field oField = TestCAEAntiDep.class.getDeclaredField("o");
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O_OFFSET = UNSAFE.objectFieldOffset(oField);
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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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static int m(TestCAEAntiDep test, Object expected, Object x) {
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C old = (C)UNSAFE.compareAndExchangeReference(test, O_OFFSET, expected, x);
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int res = old.f1;
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old.f1 = 0x42;
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return res;
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}
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static public void main(String[] args) {
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TestCAEAntiDep test = new TestCAEAntiDep();
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for (int i = 0; i < 20000; i++) {
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m(test, test.o, test.o);
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}
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}
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}
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