Mercurial > hg > graal-compiler
comparison test/compiler/7190310/Test7190310.java @ 6615:09aad8452938
7190310: Inlining WeakReference.get(), and hoisting $referent may lead to non-terminating loops
Summary: In C2 add software membar after load from Reference.referent field to prevent commoning of loads across safepoint since GC can change its value. In C1 always generate Reference.get() intrinsic.
Reviewed-by: roland, twisti, dholmes, johnc
author | kvn |
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date | Mon, 20 Aug 2012 09:58:58 -0700 |
parents | |
children | bf623b2d5508 |
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6614:006050192a5a | 6615:09aad8452938 |
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1 /* | |
2 * Copyright (c) 2012, 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 /* | |
26 * Manual test | |
27 */ | |
28 | |
29 import java.lang.ref.*; | |
30 | |
31 public class Test7190310 { | |
32 private static Object str = new Object() { | |
33 public String toString() { | |
34 return "The Object"; | |
35 } | |
36 | |
37 protected void finalize() throws Throwable { | |
38 System.out.println("The Object is being finalized"); | |
39 super.finalize(); | |
40 } | |
41 }; | |
42 private final static ReferenceQueue<Object> rq = | |
43 new ReferenceQueue<Object>(); | |
44 private final static WeakReference<Object> wr = | |
45 new WeakReference<Object>(str, rq); | |
46 | |
47 public static void main(String[] args) | |
48 throws InterruptedException { | |
49 Thread reader = new Thread() { | |
50 public void run() { | |
51 while (wr.get() != null) { | |
52 } | |
53 System.out.println("wr.get() returned null"); | |
54 } | |
55 }; | |
56 | |
57 Thread queueReader = new Thread() { | |
58 public void run() { | |
59 try { | |
60 Reference<? extends Object> ref = rq.remove(); | |
61 System.out.println(ref); | |
62 System.out.println("queueReader returned, ref==wr is " | |
63 + (ref == wr)); | |
64 } catch (InterruptedException e) { | |
65 System.err.println("Sleep interrupted - exiting"); | |
66 } | |
67 } | |
68 }; | |
69 | |
70 reader.start(); | |
71 queueReader.start(); | |
72 | |
73 Thread.sleep(1000); | |
74 str = null; | |
75 System.gc(); | |
76 } | |
77 } | |
78 |