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annotate test/compiler/stringopts/TestStringObjectInitialization.java @ 24155:88bd5f7522a1 jvmci-0.30

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update hgignore and undo change to hotspot/.project
author Doug Simon <doug.simon@oracle.com>
date Fri, 07 Jul 2017 15:08:58 +0200
parents 173a1f83c930
children
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1 /*
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2 * Copyright (c) 2016, 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 import java.util.Arrays;
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26
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27 /*
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28 * @test
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29 * @bug 8159244
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30 * @requires vm.gc == "Parallel" | vm.gc == "null"
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31 * @summary Verifies that no partially initialized String object escapes from
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32 * C2's String concat optimization in a highly concurrent setting.
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33 * This test triggers the bug in about 1 out of 10 runs.
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34 * @compile -XDstringConcat=inline TestStringObjectInitialization.java
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35 * @run main/othervm/timeout=300 -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops -XX:-CompactStrings
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36 * -XX:-UseG1GC -XX:+UseParallelGC TestStringObjectInitialization
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37 */
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38 public class TestStringObjectInitialization {
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39
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40 String myString;
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41
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42 public static void main(String[] args) throws Exception {
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43 TestStringObjectInitialization t = new TestStringObjectInitialization();
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44 // Create some threads that concurrently update 'myString'
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45 for (int i = 0; i < 100; ++i) {
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46 (new Thread(new Runner(t))).start();
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47 }
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48 Thread last = new Thread(new Runner(t));
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49 last.start();
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50 last.join();
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51 }
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52
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53 private void add(String message) {
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54 // String escapes to other threads here
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55 myString += message;
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56 }
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57
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58 public void run(String s, String[] sArray) {
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59 // Trigger C2's string concatenation optimization
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60 add(s + Arrays.toString(sArray) + " const ");
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61 }
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62 }
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63
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64 class Runner implements Runnable {
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65 private TestStringObjectInitialization test;
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66
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67 public Runner(TestStringObjectInitialization t) {
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68 test = t;
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69 }
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70
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71 public void run(){
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72 String[] array = {"a", "b", "c"};
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73 for (int i = 0; i < 10000; ++i) {
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74 test.run("a", array);
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75 }
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76 }
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77 }
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78