1 /*
2 * Copyright (c) 2014, 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 * @test
26 * @bug 8058744
27 * @summary Invalid pattern-matching of address computations in raw unsafe
28 * @run main/othervm -Xbatch UnsafeRaw
29 *
30 */
31
32 import sun.misc.Unsafe;
33 import java.util.Random;
34
35 public class UnsafeRaw {
36 private static sun.misc.Unsafe getUnsafe() throws NoSuchFieldException, IllegalAccessException {
37 java.lang.reflect.Field f = sun.misc
38 .Unsafe.class.getDeclaredField("theUnsafe");
39 f.setAccessible(true);
40 sun.misc.Unsafe unsafe = (Unsafe) f.get(null);
41 return unsafe;
42 }
43 public static class Tests {
44 public static int int_index(sun.misc.Unsafe unsafe, long base, int index) throws Exception {
45 return unsafe.getInt(base + (index << 2));
46 }
47 public static int long_index(sun.misc.Unsafe unsafe, long base, long index) throws Exception {
48 return unsafe.getInt(base + (index << 2));
49 }
50 public static int int_index_back_ashift(sun.misc.Unsafe unsafe, long base, int index) throws Exception {
51 return unsafe.getInt(base + (index >> 2));
52 }
53 public static int int_index_back_lshift(sun.misc.Unsafe unsafe, long base, int index) throws Exception {
54 return unsafe.getInt(base + (index >>> 2));
55 }
56 public static int long_index_back_ashift(sun.misc.Unsafe unsafe, long base, long index) throws Exception {
57 return unsafe.getInt(base + (index >> 2));
58 }
59 public static int long_index_back_lshift(sun.misc.Unsafe unsafe, long base, long index) throws Exception {
60 return unsafe.getInt(base + (index >>> 2));
61 }
62 public static int int_const_12345678_index(sun.misc.Unsafe unsafe, long base) throws Exception {
63 int idx4 = 0x12345678;
64 return unsafe.getInt(base + idx4);
65 }
66 public static int long_const_1234567890abcdef_index(sun.misc.Unsafe unsafe, long base) throws Exception {
67 long idx5 = 0x1234567890abcdefL;
68 return unsafe.getInt(base + idx5);
69 }
70 }
71
72 public static void main(String[] args) throws Exception {
73 sun.misc.Unsafe unsafe = getUnsafe();
74 final int array_size = 128;
75 final int element_size = 4;
76 final int magic = 0x12345678;
77
78 Random rnd = new Random();
79
80 long array = unsafe.allocateMemory(array_size * element_size); // 128 ints
81 long addr = array + array_size * element_size / 2; // something in the middle to work with
82 unsafe.putInt(addr, magic);
83 for (int j = 0; j < 100000; j++) {
84 if (Tests.int_index(unsafe, addr, 0) != magic) throw new Exception();
85 if (Tests.long_index(unsafe, addr, 0) != magic) throw new Exception();
86 {
87 long idx1 = rnd.nextLong();
88 long addr1 = addr - (idx1 << 2);
89 if (Tests.long_index(unsafe, addr1, idx1) != magic) throw new Exception();
90 }
91 {
92 long idx2 = rnd.nextLong();
93 long addr2 = addr - (idx2 >> 2);
94 if (Tests.long_index_back_ashift(unsafe, addr2, idx2) != magic) throw new Exception();
95 }
96 {
97 long idx3 = rnd.nextLong();
98 long addr3 = addr - (idx3 >>> 2);
99 if (Tests.long_index_back_lshift(unsafe, addr3, idx3) != magic) throw new Exception();
100 }
101 {
102 long idx4 = 0x12345678;
103 long addr4 = addr - idx4;
104 if (Tests.int_const_12345678_index(unsafe, addr4) != magic) throw new Exception();
105 }
106 {
107 long idx5 = 0x1234567890abcdefL;
108 long addr5 = addr - idx5;
109 if (Tests.long_const_1234567890abcdef_index(unsafe, addr5) != magic) throw new Exception();
110 }
111 {
112 int idx6 = rnd.nextInt();
113 long addr6 = addr - (idx6 >> 2);
114 if (Tests.int_index_back_ashift(unsafe, addr6, idx6) != magic) throw new Exception();
115 }
116 {
117 int idx7 = rnd.nextInt();
118 long addr7 = addr - (idx7 >>> 2);
119 if (Tests.int_index_back_lshift(unsafe, addr7, idx7) != magic) throw new Exception();
120 }
121 }
122 }
123 }