/*
* 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.
*
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*/
/* @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");
}
}