58 lines
2.2 KiB
Java
58 lines
2.2 KiB
Java
/*
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* Copyright (c) 2014, 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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* @test TestMemBarAcquire
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* @bug 8048879
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* @summary Tests optimization of MemBarAcquireNodes
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* @run main/othervm -XX:-TieredCompilation -XX:-BackgroundCompilation
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* compiler.membars.TestMemBarAcquire
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*/
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package compiler.membars;
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public class TestMemBarAcquire {
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private volatile static Object defaultObj = new Object();
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private Object obj;
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public TestMemBarAcquire(Object param) {
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// Volatile load. MemBarAcquireNode is added after the
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// load to prevent following loads from floating up past.
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// StoreNode is added to store result of load in 'obj'.
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this.obj = defaultObj;
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// Overrides 'obj' and therefore makes previous StoreNode
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// and the corresponding LoadNode useless. However, the
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// LoadNode is still connected to the MemBarAcquireNode
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// that should now release the reference.
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this.obj = param;
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}
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public static void main(String[] args) throws Exception {
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// Make sure TestMemBarAcquire::<init> is compiled
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for (int i = 0; i < 100000; ++i) {
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TestMemBarAcquire p = new TestMemBarAcquire(new Object());
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}
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}
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}
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