Mercurial > hg > truffle
annotate test/compiler/7190310/Test7190310.java @ 14323:d2954f85a366
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author | amurillo |
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date | Fri, 07 Feb 2014 09:41:36 -0800 |
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1 /* |
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2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 |
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25 /* |
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26 * @test |
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27 * @bug 7190310 |
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28 * @summary Inlining WeakReference.get(), and hoisting $referent may lead to non-terminating loops |
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29 * @run main/othervm/timeout=600 -Xbatch Test7190310 |
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30 */ |
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31 |
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32 /* |
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33 * Note bug exhibits as infinite loop, timeout is helpful. |
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34 * It should normally finish pretty quickly, but on some especially slow machines |
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35 * it may not. The companion _unsafe test lacks a timeout, but that is okay. |
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36 */ |
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37 |
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38 import java.lang.ref.*; |
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39 |
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40 public class Test7190310 { |
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41 private static Object str = new Object() { |
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42 public String toString() { |
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43 return "The Object"; |
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44 } |
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45 |
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46 protected void finalize() throws Throwable { |
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47 System.out.println("The Object is being finalized"); |
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48 super.finalize(); |
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49 } |
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50 }; |
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51 private final static ReferenceQueue<Object> rq = |
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52 new ReferenceQueue<Object>(); |
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53 private final static WeakReference<Object> wr = |
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54 new WeakReference<Object>(str, rq); |
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55 |
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56 public static void main(String[] args) |
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57 throws InterruptedException { |
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58 Thread reader = new Thread() { |
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59 public void run() { |
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60 while (wr.get() != null) { |
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61 } |
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62 System.out.println("wr.get() returned null"); |
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63 } |
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64 }; |
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65 |
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66 Thread queueReader = new Thread() { |
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67 public void run() { |
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68 try { |
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69 Reference<? extends Object> ref = rq.remove(); |
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70 System.out.println(ref); |
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71 System.out.println("queueReader returned, ref==wr is " |
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72 + (ref == wr)); |
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73 } catch (InterruptedException e) { |
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74 System.err.println("Sleep interrupted - exiting"); |
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75 } |
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76 } |
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77 }; |
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78 |
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79 reader.start(); |
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80 queueReader.start(); |
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81 |
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82 Thread.sleep(1000); |
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83 str = null; |
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84 System.gc(); |
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85 } |
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86 } |
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87 |