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comparison test/compiler/membars/TestMemBarAcquire.java @ 20413:91cb3b8aac2b

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8048879: "unexpected yanked node" opto/postaloc.cpp:139 Summary: MemBarAcquireNode prevents deletion of dead LoadNNode. Added condition to 'has_special_unique_user' to trigger deletion. Reviewed-by: kvn, iveresov
author thartmann
date Tue, 19 Aug 2014 07:36:11 +0200
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20412:7ff83df6c85a 20413:91cb3b8aac2b
1 /*
2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * @test TestMemBarAcquire
26 * @bug 8048879
27 * @summary "Tests optimization of MemBarAcquireNodes"
28 * @run main/othervm -XX:-TieredCompilation -XX:-BackgroundCompilation TestMemBarAcquire
29 */
30 public class TestMemBarAcquire {
31 private volatile static Object defaultObj = new Object();
32 private Object obj;
33
34 public TestMemBarAcquire(Object param) {
35 // Volatile load. MemBarAcquireNode is added after the
36 // load to prevent following loads from floating up past.
37 // StoreNode is added to store result of load in 'obj'.
38 this.obj = defaultObj;
39 // Overrides 'obj' and therefore makes previous StoreNode
40 // and the corresponding LoadNode useless. However, the
41 // LoadNode is still connected to the MemBarAcquireNode
42 // that should now release the reference.
43 this.obj = param;
44 }
45
46 public static void main(String[] args) throws Exception {
47 // Make sure TestMemBarAcquire::<init> is compiled
48 for (int i = 0; i < 100000; ++i) {
49 TestMemBarAcquire p = new TestMemBarAcquire(new Object());
50 }
51 }
52 }
53