1 /* 2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test 26 * @bug 8011706 27 * @summary loop invariant code motion may move load before store to the same field 28 * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation Test8011706 29 * 30 */ 31 32 public class Test8011706 { 33 int[] array; 34 35 void m(boolean test, int[] array1, int[] array2) { 36 int i = 0; 37 if (test) { 38 array = array1; 39 } else { 40 array = array2; 41 } 42 43 while(true) { 44 int v = array[i]; 45 i++; 46 if (i >= 10) return; 47 } 48 } 49 50 static public void main(String[] args) { 51 int[] new_array = new int[10]; 52 Test8011706 ti = new Test8011706(); 53 boolean failed = false; 54 try { 55 for (int i = 0; i < 10000; i++) { 56 ti.array = null; 57 ti.m(true, new_array, new_array); 58 } 59 } catch(NullPointerException ex) { 60 throw new RuntimeException("TEST FAILED", ex); 61 } 62 System.out.println("TEST PASSED"); 63 } 64 65 }