1 /* 2 * Copyright (c) 2015, 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 /** 26 * @test 27 * @bug 8142386 28 * @summary Unsafe access to an array is wrongly marked as mismatched 29 * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:-TieredCompilation TestUnsafeMismatchedArrayFieldAccess 30 * 31 */ 32 33 import java.lang.reflect.*; 34 import sun.misc.Unsafe; 35 36 public class TestUnsafeMismatchedArrayFieldAccess { 37 38 private static final Unsafe UNSAFE; 39 40 static { 41 try { 42 Field unsafeField = Unsafe.class.getDeclaredField("theUnsafe"); 43 unsafeField.setAccessible(true); 44 UNSAFE = (Unsafe) unsafeField.get(null); 45 array_offset = UNSAFE.objectFieldOffset(TestUnsafeMismatchedArrayFieldAccess.class.getDeclaredField("array")); 46 } 47 catch (Exception e) { 48 throw new AssertionError(e); 49 } 50 } 51 52 int[] array; 53 static final long array_offset; 54 55 void m() { 56 UNSAFE.getObject(this, array_offset); 57 } 58 59 static public void main(String[] args) { 60 TestUnsafeMismatchedArrayFieldAccess test = new TestUnsafeMismatchedArrayFieldAccess(); 61 62 for (int i = 0; i < 20000; i++) { 63 test.m(); 64 } 65 } 66 }