1 /* 2 * Copyright (c) 2015, 2016, 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 * @modules java.base/jdk.internal.misc 30 * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation TestUnsafeUnalignedMismatchedAccesses 31 * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:+UnlockDiagnosticVMOptions -XX:-UseUnalignedAccesses TestUnsafeUnalignedMismatchedAccesses 32 * 33 */ 34 35 import java.lang.reflect.*; 36 import jdk.internal.misc.Unsafe; 37 38 public class TestUnsafeUnalignedMismatchedAccesses { 39 40 private static final Unsafe UNSAFE; 41 42 static { 43 try { 44 Field unsafeField = Unsafe.class.getDeclaredField("theUnsafe"); 45 unsafeField.setAccessible(true); 46 UNSAFE = (Unsafe) unsafeField.get(null); 47 } 48 catch (Exception e) { 49 throw new AssertionError(e); 50 } 51 } 52 53 static void test1(byte[] array) { 54 array[0] = 0; 55 UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET, 0); 56 array[0] = 0; 57 } 58 59 static void test2(byte[] array) { 60 array[0] = 0; 61 UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+1, 0); 62 array[0] = 0; 63 } 64 65 static void test3(byte[] array) { 66 array[0] = 0; 67 UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+2, 0); 68 array[0] = 0; 69 } 70 71 static void test4(byte[] array) { 72 array[0] = 0; 73 UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+3, 0); 74 array[0] = 0; 75 } 76 77 static void test5(byte[] array) { 78 array[0] = 0; 79 UNSAFE.putInt(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET, 0); 80 array[0] = 0; 81 } 82 83 // unaligned access and non escaping allocation 84 static void test6() { 85 byte[] array = new byte[10]; 86 UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+1, -1); 87 array[0] = 0; 88 } 89 90 // unaligned access and non escaping allocation 91 static int test7() { 92 byte[] array = new byte[10]; 93 UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+1, -1); 94 array[0] = 0; 95 array[2] = 0; 96 return array[0] + array[1] + array[2] + array[3] + array[4]; 97 } 98 99 // unaligned access with vectorization 100 static void test8(int[] src1, int[] src2, int[] dst) { 101 for (int i = 0; i < dst.length-1; i++) { 102 int res = src1[i] + src2[i]; 103 UNSAFE.putIntUnaligned(dst, UNSAFE.ARRAY_INT_BASE_OFFSET + i*4+1, res); 104 } 105 } 106 107 static public void main(String[] args) throws Exception { 108 byte[] byte_array = new byte[100]; 109 int[] int_array = new int[100]; 110 Object[] obj_array = new Object[100]; 111 TestUnsafeUnalignedMismatchedAccesses test = new TestUnsafeUnalignedMismatchedAccesses(); 112 for (int i = 0; i < 20000; i++) { 113 test1(byte_array); 114 test2(byte_array); 115 test3(byte_array); 116 test4(byte_array); 117 test5(byte_array); 118 test6(); 119 test7(); 120 test8(int_array, int_array, int_array); 121 } 122 } 123 }