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 8136473 28 * @summary Mismatched stores on same slice possible with Unsafe.Put*Unaligned methods 29 * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation TestUnalignedStoreIThenStoreB 30 * 31 */ 32 33 import java.lang.reflect.*; 34 import sun.misc.Unsafe; 35 36 public class TestUnalignedStoreIThenStoreB { 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 } 46 catch (Exception e) { 47 throw new AssertionError(e); 48 } 49 } 50 51 static void test1(byte[] array) { 52 array[0] = 0; 53 UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET, 0); 54 array[0] = 0; 55 } 56 57 // unaligned access and non escaping allocation 58 static void test2() { 59 byte[] array = new byte[10]; 60 UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+1, -1); 61 array[0] = 0; 62 } 63 64 // unaligned access and non escaping allocation 65 static int test3() { 66 byte[] array = new byte[10]; 67 UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+1, -1); 68 array[0] = 0; 69 array[2] = 0; 70 return array[0] + array[1] + array[2] + array[3] + array[4]; 71 } 72 73 // unaligned access with vectorization 74 static void test4(int[] src1, int[] src2, int[] dst) { 75 for (int i = 0; i < dst.length-1; i++) { 76 int res = src1[i] + src2[i]; 77 UNSAFE.putIntUnaligned(dst, UNSAFE.ARRAY_INT_BASE_OFFSET + i*4+1, res); 78 } 79 } 80 81 static public void main(String[] args) { 82 byte[] byte_array = new byte[100]; 83 int[] int_array = new int[100]; 84 for (int i = 0; i < 20000; i++) { 85 test1(byte_array); 86 test2(); 87 test3(); 88 test4(int_array, int_array, int_array); 89 } 90 } 91 }