hotspot/test/compiler/loopopts/CountedLoopProblem.java
author iveresov
Tue, 24 Feb 2015 23:31:00 -0800
changeset 29343 cf560f960e85
parent 29087 79c30f6c2125
child 40059 c2304140ed64
permissions -rw-r--r--
8073735: compiler/loopopts/CountedLoopProblem.java got OOME Summary: Ignore OOM in the test Reviewed-by: kvn
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/*
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 * Copyright (c) 2015, 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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/**
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 * @test
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 * @bug 8072753
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 * @summary Inner loop induction variable increment occurs before compare which causes integer overflow
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 * @run main/othervm CountedLoopProblem
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 *
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 */
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import java.util.*;
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public class CountedLoopProblem {
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    public static void main(String[] args) throws Exception {
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        Random r = new Random(42);
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        int x = 0;
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        try {
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            StringBuilder sb = new StringBuilder();
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            for(int i = 0; i < 1000000; ++i) {
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                int v = Math.abs(r.nextInt());
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                sb.append('+').append(v).append('\n');
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                x += v;
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                // To trigger the problem we must OSR in the following loop
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                // To make the problem 100% reproducible run with -XX:-TieredCompilation -XX:OSROnlyBCI=62
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                while(x < 0) x += 1000000000;
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                sb.append('=').append(x).append('\n');
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            }
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            if (sb.toString().hashCode() != 0xaba94591) {
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                throw new Exception("Unexpected result");
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            }
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        } catch(OutOfMemoryError e) {
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            // small heap, ignore
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        }
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    }
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}
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