92 lines
3.0 KiB
Java
92 lines
3.0 KiB
Java
/*
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8159244
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* @summary Verifies that no partially initialized String object escapes from
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* C2's String concat optimization in a highly concurrent setting.
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* This test triggers the bug in about 1 out of 10 runs.
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* @requires vm.gc == "Parallel" | vm.gc == "null"
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*
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* @compile -XDstringConcat=inline TestStringObjectInitialization.java
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* @run main/othervm/timeout=300 -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops -XX:-CompactStrings
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* -XX:-UseG1GC -XX:+UseParallelGC
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* compiler.stringopts.TestStringObjectInitialization
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*/
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package compiler.stringopts;
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import java.util.Arrays;
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public class TestStringObjectInitialization {
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String myString;
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public static void main(String[] args) throws Exception {
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TestStringObjectInitialization t = new TestStringObjectInitialization();
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// Create some threads that concurrently update 'myString'
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for (int i = 0; i < 100; ++i) {
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(new Thread(new Runner(t))).start();
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}
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Thread last = new Thread(new Runner(t));
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last.start();
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last.join();
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}
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private void add(String message) {
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// String escapes to other threads here
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myString += message;
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}
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public void run(String s, String[] sArray) {
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// Trigger C2's string concatenation optimization
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add(s + Arrays.toString(sArray) + " const ");
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}
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public void reset() {
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// Reset string to avoid OOMEs
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myString = "";
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}
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private static class Runner implements Runnable {
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private TestStringObjectInitialization test;
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public Runner(TestStringObjectInitialization t) {
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test = t;
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}
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public void run() {
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String[] array = {"a", "b", "c"};
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for (int i = 0; i < 100_000; ++i) {
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test.run("a", array);
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test.reset();
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}
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}
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}
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}
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