| /* |
| * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /** |
| * @test |
| * @bug 8072753 |
| * @summary Inner loop induction variable increment occurs before compare which causes integer overflow |
| * @run main/othervm compiler.loopopts.CountedLoopProblem |
| * |
| */ |
| |
| package compiler.loopopts; |
| |
| import java.util.Random; |
| |
| public class CountedLoopProblem { |
| public static void main(String[] args) throws Exception { |
| Random r = new Random(42); |
| int x = 0; |
| try { |
| StringBuilder sb = new StringBuilder(); |
| for(int i = 0; i < 1000000; ++i) { |
| int v = Math.abs(r.nextInt()); |
| sb.append('+').append(v).append('\n'); |
| x += v; |
| // To trigger the problem we must OSR in the following loop |
| // To make the problem 100% reproducible run with -XX:-TieredCompilation -XX:OSROnlyBCI=62 |
| while(x < 0) x += 1000000000; |
| sb.append('=').append(x).append('\n'); |
| } |
| if (sb.toString().hashCode() != 0xaba94591) { |
| throw new Exception("Unexpected result"); |
| } |
| } catch(OutOfMemoryError e) { |
| // small heap, ignore |
| } |
| } |
| } |
| |