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 *
31 * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation
32 * compiler.intrinsics.unsafe.TestUnsafeUnalignedMismatchedAccesses
33 * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation
34 * -XX:+UnlockDiagnosticVMOptions -XX:-UseUnalignedAccesses
35 * compiler.intrinsics.unsafe.TestUnsafeUnalignedMismatchedAccesses
36 */
37
38 package compiler.intrinsics.unsafe;
39
40 import jdk.internal.misc.Unsafe;
41
42 import java.lang.reflect.Field;
43
44 public class TestUnsafeUnalignedMismatchedAccesses {
45
46 private static final Unsafe UNSAFE;
47
48 static {
49 try {
50 Field unsafeField = Unsafe.class.getDeclaredField("theUnsafe");
51 unsafeField.setAccessible(true);
52 UNSAFE = (Unsafe) unsafeField.get(null);
53 }
54 catch (Exception e) {
55 throw new AssertionError(e);
56 }
57 }
58
59 static void test1(byte[] array) {
60 array[0] = 0;
61 UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET, 0);
62 array[0] = 0;
63 }
64
65 static void test2(byte[] array) {
66 array[0] = 0;
67 UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+1, 0);
68 array[0] = 0;
69 }
70
71 static void test3(byte[] array) {
72 array[0] = 0;
73 UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+2, 0);
74 array[0] = 0;
75 }
76
77 static void test4(byte[] array) {
78 array[0] = 0;
79 UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+3, 0);
80 array[0] = 0;
81 }
82
83 static void test5(byte[] array) {
84 array[0] = 0;
85 UNSAFE.putInt(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET, 0);
86 array[0] = 0;
87 }
88
89 // unaligned access and non escaping allocation
90 static void test6() {
91 byte[] array = new byte[10];
92 UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+1, -1);
93 array[0] = 0;
94 }
95
96 // unaligned access and non escaping allocation
97 static int test7() {
98 byte[] array = new byte[10];
99 UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+1, -1);
100 array[0] = 0;
101 array[2] = 0;
102 return array[0] + array[1] + array[2] + array[3] + array[4];
103 }
104
105 // unaligned access with vectorization
106 static void test8(int[] src1, int[] src2, int[] dst) {
107 for (int i = 0; i < dst.length-1; i++) {
108 int res = src1[i] + src2[i];
109 UNSAFE.putIntUnaligned(dst, UNSAFE.ARRAY_INT_BASE_OFFSET + i*4+1, res);
110 }
111 }
112
113 static public void main(String[] args) throws Exception {
114 byte[] byte_array = new byte[100];
115 int[] int_array = new int[100];
116 Object[] obj_array = new Object[100];
117 TestUnsafeUnalignedMismatchedAccesses test = new TestUnsafeUnalignedMismatchedAccesses();
118 for (int i = 0; i < 20000; i++) {
119 test1(byte_array);
120 test2(byte_array);
121 test3(byte_array);
122 test4(byte_array);
123 test5(byte_array);
124 test6();
125 test7();
126 test8(int_array, int_array, int_array);
127 }
128 }
129 }