Mercurial > hg > graal-compiler
view test/compiler/membars/TestMemBarAcquire.java @ 22232:4a500b3783fb
Merge
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Wed, 15 Jul 2015 10:16:28 -0700 |
parents | 91cb3b8aac2b |
children |
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/* * Copyright (c) 2014, 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 TestMemBarAcquire * @bug 8048879 * @summary "Tests optimization of MemBarAcquireNodes" * @run main/othervm -XX:-TieredCompilation -XX:-BackgroundCompilation TestMemBarAcquire */ public class TestMemBarAcquire { private volatile static Object defaultObj = new Object(); private Object obj; public TestMemBarAcquire(Object param) { // Volatile load. MemBarAcquireNode is added after the // load to prevent following loads from floating up past. // StoreNode is added to store result of load in 'obj'. this.obj = defaultObj; // Overrides 'obj' and therefore makes previous StoreNode // and the corresponding LoadNode useless. However, the // LoadNode is still connected to the MemBarAcquireNode // that should now release the reference. this.obj = param; } public static void main(String[] args) throws Exception { // Make sure TestMemBarAcquire::<init> is compiled for (int i = 0; i < 100000; ++i) { TestMemBarAcquire p = new TestMemBarAcquire(new Object()); } } }