| /* |
| * Copyright (c) 2018, Red Hat, Inc. 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 8215265 |
| * @summary C2: range check elimination may allow illegal out of bound access |
| * |
| * @run main/othervm -XX:-TieredCompilation -XX:-BackgroundCompilation -XX:-UseOnStackReplacement -XX:-UseLoopPredicate RangeCheckEliminationScaleNotOne |
| * |
| */ |
| |
| import java.util.Arrays; |
| |
| public class RangeCheckEliminationScaleNotOne { |
| public static void main(String[] args) { |
| { |
| int[] array = new int[199]; |
| boolean[] flags = new boolean[100]; |
| Arrays.fill(flags, true); |
| flags[0] = false; |
| flags[1] = false; |
| for (int i = 0; i < 20_000; i++) { |
| test1(100, array, 0, flags); |
| } |
| boolean ex = false; |
| try { |
| test1(100, array, -5, flags); |
| } catch (ArrayIndexOutOfBoundsException aie) { |
| ex = true; |
| } |
| if (!ex) { |
| throw new RuntimeException("no AIOOB exception"); |
| } |
| } |
| |
| { |
| int[] array = new int[199]; |
| boolean[] flags = new boolean[100]; |
| Arrays.fill(flags, true); |
| flags[0] = false; |
| flags[1] = false; |
| for (int i = 0; i < 20_000; i++) { |
| test2(100, array, 198, flags); |
| } |
| boolean ex = false; |
| try { |
| test2(100, array, 203, flags); |
| } catch (ArrayIndexOutOfBoundsException aie) { |
| ex = true; |
| } |
| if (!ex) { |
| throw new RuntimeException("no AIOOB exception"); |
| } |
| } |
| } |
| |
| private static int test1(int stop, int[] array, int offset, boolean[] flags) { |
| if (array == null) {} |
| int res = 0; |
| for (int i = 0; i < stop; i++) { |
| if (flags[i]) { |
| res += array[2 * i + offset]; |
| } |
| } |
| return res; |
| } |
| |
| |
| private static int test2(int stop, int[] array, int offset, boolean[] flags) { |
| if (array == null) {} |
| int res = 0; |
| for (int i = 0; i < stop; i++) { |
| if (flags[i]) { |
| res += array[-2 * i + offset]; |
| } |
| } |
| return res; |
| } |
| } |