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