1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/*
* Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/* @test
* @bug 6565543
* @summary Minimal test for unsafe.copyMemory() and unsafe.setMemory()
* @modules java.base/sun.nio.ch
* jdk.unsupported
* @key randomness
*/
import java.util.*;
import java.lang.reflect.*;
import java.nio.*;
import sun.misc.Unsafe;
import sun.nio.ch.DirectBuffer;
public class CopyMemory {
private final static int BUFFER_SIZE = 1024;
private final static int N = 16 * 1024;
private final static int FILLER = 0x55;
private final static int FILLER2 = 0x33;
private final static Random random = new Random();
private static void set(byte[] b, int ofs, int len, int value) {
for (int i = 0; i < len; i++) {
b[ofs + i] = (byte)value;
}
}
private static void check(byte[] b, int ofs, int len, int value) {
for (int i = 0; i < len; i++) {
int r = b[ofs + i] & 0xff;
if (r != value) {
throw new RuntimeException("mismatch");
}
}
}
private static void set(Unsafe unsafe, long addr, int ofs, int len, int value) {
for (int i = 0; i < len; i++) {
unsafe.putByte(null, addr + ofs + i, (byte)value);
}
}
private static void check(Unsafe unsafe, long addr, int ofs, int len, int value) {
for (int i = 0; i < len; i++) {
int r = unsafe.getByte(null, addr + ofs + i) & 0xff;
if (r != value) {
throw new RuntimeException("mismatch");
}
}
}
private static final List<ByteBuffer> buffers = new ArrayList<ByteBuffer>();
private static long getMemory(int n) {
ByteBuffer b = ByteBuffer.allocateDirect(n);
if (b instanceof DirectBuffer == false) {
throw new RuntimeException("Not a direct buffer");
}
buffers.add(b); // make sure the buffer does not get GCed
return ((DirectBuffer)b).address();
}
private static void testSetByteArray(Unsafe unsafe) throws Exception {
System.out.println("Testing setMemory() for byte[]...");
byte[] b = new byte[BUFFER_SIZE];
for (int i = 0; i < N; i++) {
set(b, 0, BUFFER_SIZE, FILLER);
int ofs = random.nextInt(BUFFER_SIZE / 2);
int len = random.nextInt(BUFFER_SIZE / 2);
int val = random.nextInt(256);
unsafe.setMemory(b, Unsafe.ARRAY_BYTE_BASE_OFFSET + ofs, len, (byte)val);
check(b, 0, ofs - 1, FILLER);
check(b, ofs, len, val);
check(b, ofs + len, BUFFER_SIZE - (ofs + len), FILLER);
}
}
private static void testSetRawMemory(Unsafe unsafe) throws Exception {
System.out.println("Testing setMemory() for raw memory...");
long b = getMemory(BUFFER_SIZE);
for (int i = 0; i < N; i++) {
set(unsafe, b, 0, BUFFER_SIZE, FILLER);
int ofs = random.nextInt(BUFFER_SIZE / 2);
int len = random.nextInt(BUFFER_SIZE / 2);
int val = random.nextInt(256);
unsafe.setMemory(null, b + ofs, len, (byte)val);
check(unsafe, b, 0, ofs - 1, FILLER);
check(unsafe, b, ofs, len, val);
check(unsafe, b, ofs + len, BUFFER_SIZE - (ofs + len), FILLER);
}
}
private static void testCopyByteArrayToByteArray(Unsafe unsafe) throws Exception {
System.out.println("Testing copyMemory() for byte[] to byte[]...");
byte[] b1 = new byte[BUFFER_SIZE];
byte[] b2 = new byte[BUFFER_SIZE];
for (int i = 0; i < N; i++) {
set(b1, 0, BUFFER_SIZE, FILLER);
set(b2, 0, BUFFER_SIZE, FILLER2);
int ofs = random.nextInt(BUFFER_SIZE / 2);
int len = random.nextInt(BUFFER_SIZE / 2);
int val = random.nextInt(256);
set(b1, ofs, len, val);
int ofs2 = random.nextInt(BUFFER_SIZE / 2);
unsafe.copyMemory(b1, Unsafe.ARRAY_BYTE_BASE_OFFSET + ofs,
b2, Unsafe.ARRAY_BYTE_BASE_OFFSET + ofs2, len);
check(b2, 0, ofs2 - 1, FILLER2);
check(b2, ofs2, len, val);
check(b2, ofs2 + len, BUFFER_SIZE - (ofs2 + len), FILLER2);
}
}
private static void testCopyByteArrayToRawMemory(Unsafe unsafe) throws Exception {
System.out.println("Testing copyMemory() for byte[] to raw memory...");
byte[] b1 = new byte[BUFFER_SIZE];
long b2 = getMemory(BUFFER_SIZE);
for (int i = 0; i < N; i++) {
set(b1, 0, BUFFER_SIZE, FILLER);
set(unsafe, b2, 0, BUFFER_SIZE, FILLER2);
int ofs = random.nextInt(BUFFER_SIZE / 2);
int len = random.nextInt(BUFFER_SIZE / 2);
int val = random.nextInt(256);
set(b1, ofs, len, val);
int ofs2 = random.nextInt(BUFFER_SIZE / 2);
unsafe.copyMemory(b1, Unsafe.ARRAY_BYTE_BASE_OFFSET + ofs,
null, b2 + ofs2, len);
check(unsafe, b2, 0, ofs2 - 1, FILLER2);
check(unsafe, b2, ofs2, len, val);
check(unsafe, b2, ofs2 + len, BUFFER_SIZE - (ofs2 + len), FILLER2);
}
}
private static void testCopyRawMemoryToByteArray(Unsafe unsafe) throws Exception {
System.out.println("Testing copyMemory() for raw memory to byte[]...");
long b1 = getMemory(BUFFER_SIZE);
byte[] b2 = new byte[BUFFER_SIZE];
for (int i = 0; i < N; i++) {
set(unsafe, b1, 0, BUFFER_SIZE, FILLER);
set(b2, 0, BUFFER_SIZE, FILLER2);
int ofs = random.nextInt(BUFFER_SIZE / 2);
int len = random.nextInt(BUFFER_SIZE / 2);
int val = random.nextInt(256);
set(unsafe, b1, ofs, len, val);
int ofs2 = random.nextInt(BUFFER_SIZE / 2);
unsafe.copyMemory(null, b1 + ofs,
b2, Unsafe.ARRAY_BYTE_BASE_OFFSET + ofs2, len);
check(b2, 0, ofs2 - 1, FILLER2);
check(b2, ofs2, len, val);
check(b2, ofs2 + len, BUFFER_SIZE - (ofs2 + len), FILLER2);
}
}
private static void testCopyRawMemoryToRawMemory(Unsafe unsafe) throws Exception {
System.out.println("Testing copyMemory() for raw memory to raw memory...");
long b1 = getMemory(BUFFER_SIZE);
long b2 = getMemory(BUFFER_SIZE);
for (int i = 0; i < N; i++) {
set(unsafe, b1, 0, BUFFER_SIZE, FILLER);
set(unsafe, b2, 0, BUFFER_SIZE, FILLER2);
int ofs = random.nextInt(BUFFER_SIZE / 2);
int len = random.nextInt(BUFFER_SIZE / 2);
int val = random.nextInt(256);
set(unsafe, b1, ofs, len, val);
int ofs2 = random.nextInt(BUFFER_SIZE / 2);
unsafe.copyMemory(null, b1 + ofs,
null, b2 + ofs2, len);
check(unsafe, b2, 0, ofs2 - 1, FILLER2);
check(unsafe, b2, ofs2, len, val);
check(unsafe, b2, ofs2 + len, BUFFER_SIZE - (ofs2 + len), FILLER2);
}
}
private static Unsafe getUnsafe() throws Exception {
Field f = Unsafe.class.getDeclaredField("theUnsafe");
f.setAccessible(true);
return (Unsafe)f.get(null);
}
public static void main(String[] args) throws Exception {
Unsafe unsafe = getUnsafe();
testSetByteArray(unsafe);
testSetRawMemory(unsafe);
testCopyByteArrayToByteArray(unsafe);
testCopyByteArrayToRawMemory(unsafe);
testCopyRawMemoryToByteArray(unsafe);
testCopyRawMemoryToRawMemory(unsafe);
System.out.println("OK");
}
}
|
