test/hotspot/jtreg/compiler/stringopts/TestStringObjectInitialization.java
author iklam
Tue, 28 Nov 2017 09:47:04 -0800 (2017-11-28)
changeset 48155 551de50b4ff7
parent 47216 71c04702a3d5
permissions -rw-r--r--
8191927: Enable AppCDS for custom loaders on all 64-bit Linux and AIX Summary: Added "@requires vm.cds.custom.loaders" to mark tests related to custom loaders Reviewed-by: simonis, mseledtsov Contributed-by: volker.simonis@gmail.com
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/*
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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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