@Override
@ForceInline
public byte readByte(long offset) {
if (Jvm.isDebug()) checkReleased();
return memory.readByte(address + translate(offset));
}
@Test
public void printVdso() throws IOException, InterruptedException {
long start = 0;
long end = 0;
String maps = "/proc/self/maps";
if (!new File(maps).exists()) return;
BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(maps)));
try {
for (String line; (line = br.readLine()) != null; ) {
if (line.endsWith("[vdso]")) {
String[] parts = line.split("[- ]");
start = Long.parseLong(parts[0], 16);
end = Long.parseLong(parts[1], 16);
}
// System.out.println(line);
}
} catch (IOException ioe) {
br.close();
throw ioe;
}
System.out.printf("vdso %x to %x %n", start, end);
NativeBytes nb = new NativeBytes(start, end);
long[] longs = new long[(int) ((end - start) / 8)];
for (int i = 0; i < longs.length; i++) longs[i] = nb.readLong(i * 8);
Jvm.pause(1);
for (int i = 0; i < longs.length; i++) {
long l = nb.readLong(i * 8);
if (l != longs[i]) System.out.printf("%d: %d %x%n", i, l, l);
}
}
@SuppressWarnings("sunapi")
public class NativeBytesStore<Underlying>
implements BytesStore<NativeBytesStore<Underlying>, Underlying> {
private static final long MEMORY_MAPPED_SIZE = 128 << 10;
private static final Logger LOGGER = LoggerFactory.getLogger(NativeBytesStore.class);
@Nullable private final Cleaner cleaner;
private final boolean elastic;
@Nullable private final Underlying underlyingObject;
@Nullable
private final Throwable createdHere = Jvm.isDebug() ? new Throwable("Created here") : null;
// on release, set this to null.
@Nullable protected Memory memory = OS.memory();
private final ReferenceCounter refCount = ReferenceCounter.onReleased(this::performRelease);
protected long address;
long maximumLimit;
private Error releasedHere;
private NativeBytesStore(@NotNull ByteBuffer bb, boolean elastic) {
this.elastic = elastic;
underlyingObject = (Underlying) bb;
setAddress(((DirectBuffer) bb).address());
this.maximumLimit = bb.capacity();
cleaner = ((DirectBuffer) bb).cleaner();
}
public NativeBytesStore(long address, long maximumLimit) {
this(address, maximumLimit, null, false);
}
public NativeBytesStore(
long address, long maximumLimit, @Nullable Runnable deallocator, boolean elastic) {
setAddress(address);
this.maximumLimit = maximumLimit;
cleaner = deallocator == null ? null : Cleaner.create(this, deallocator);
underlyingObject = null;
this.elastic = elastic;
}
@NotNull
public static NativeBytesStore<ByteBuffer> wrap(@NotNull ByteBuffer bb) {
return new NativeBytesStore<>(bb, false);
}
/**
* this is an elastic native store
*
* @param capacity of the buffer.
*/
@NotNull
public static NativeBytesStore<Void> nativeStore(long capacity) throws IllegalArgumentException {
return of(capacity, true, true);
}
@NotNull
private static NativeBytesStore<Void> of(long capacity, boolean zeroOut, boolean elastic)
throws IllegalArgumentException {
Memory memory = OS.memory();
long address = memory.allocate(capacity);
if (zeroOut || capacity < MEMORY_MAPPED_SIZE) {
memory.setMemory(address, capacity, (byte) 0);
memory.storeFence();
}
Deallocator deallocator = new Deallocator(address, capacity);
return new NativeBytesStore<>(address, capacity, deallocator, elastic);
}
@NotNull
public static NativeBytesStore<Void> nativeStoreWithFixedCapacity(long capacity)
throws IllegalArgumentException {
return of(capacity, true, false);
}
@NotNull
public static NativeBytesStore<Void> lazyNativeBytesStoreWithFixedCapacity(long capacity)
throws IllegalArgumentException {
return of(capacity, false, false);
}
@NotNull
public static NativeBytesStore<ByteBuffer> elasticByteBuffer() {
return elasticByteBuffer(OS.pageSize());
}
@NotNull
public static NativeBytesStore<ByteBuffer> elasticByteBuffer(int size) {
return new NativeBytesStore<>(ByteBuffer.allocateDirect(size), true);
}
@NotNull
@Override
public BytesStore<NativeBytesStore<Underlying>, Underlying> copy() throws IllegalStateException {
if (underlyingObject == null) {
NativeBytesStore<Void> copy = of(realCapacity(), false, true);
OS.memory().copyMemory(address, copy.address, capacity());
return (BytesStore) copy;
} else if (underlyingObject instanceof ByteBuffer) {
ByteBuffer bb = ByteBuffer.allocateDirect(Maths.toInt32(capacity()));
bb.put((ByteBuffer) underlyingObject);
bb.clear();
return (BytesStore) wrap(bb);
} else {
throw new UnsupportedOperationException();
}
}
@Override
public VanillaBytes<Underlying> bytesForWrite() throws IllegalStateException {
return elastic ? new NativeBytes<>(this) : new VanillaBytes<>(this);
}
@Override
@ForceInline
public long realCapacity() {
return maximumLimit;
}
@Override
@ForceInline
public long capacity() {
return maximumLimit;
}
@Nullable
@Override
@ForceInline
public Underlying underlyingObject() {
return underlyingObject;
}
@NotNull
@Override
@ForceInline
public NativeBytesStore<Underlying> zeroOut(long start, long end)
throws IllegalArgumentException {
if (start < writePosition() || end > writeLimit())
throw new IllegalArgumentException(
"position: "
+ writePosition()
+ ", start: "
+ start
+ ", end: "
+ end
+ ", limit: "
+ writeLimit());
if (start >= end) return this;
memory.setMemory(address + translate(start), end - start, (byte) 0);
return this;
}
@Override
@ForceInline
public boolean compareAndSwapInt(long offset, int expected, int value) {
return memory.compareAndSwapInt(address + translate(offset), expected, value);
}
@Override
@ForceInline
public boolean compareAndSwapLong(long offset, long expected, long value) {
return memory.compareAndSwapLong(address + translate(offset), expected, value);
}
long translate(long offset) {
long offset2 = offset - start();
// assert checkTranslatedBounds(offset2);
return offset2;
}
public long start() {
return 0L;
}
@Override
public void reserve() throws IllegalStateException {
refCount.reserve();
}
@Override
public void release() throws IllegalStateException {
refCount.release();
if (Jvm.isDebug() && refCount.get() == 0) releasedHere = new Error("Released here");
}
@Override
public long refCount() {
return refCount.get();
}
@Override
@ForceInline
public byte readByte(long offset) {
if (Jvm.isDebug()) checkReleased();
return memory.readByte(address + translate(offset));
}
public void checkReleased() {
if (releasedHere != null)
throw new InternalError("Accessing a released resource", releasedHere);
}
@Override
@ForceInline
public short readShort(long offset) {
return memory.readShort(address + translate(offset));
}
@Override
@ForceInline
public int readInt(long offset) {
return memory.readInt(address + translate(offset));
}
@Override
@ForceInline
public long readLong(long offset) {
return memory.readLong(address + translate(offset));
}
@Override
@ForceInline
public float readFloat(long offset) {
return memory.readFloat(address + translate(offset));
}
@Override
@ForceInline
public double readDouble(long offset) {
return memory.readDouble(address + translate(offset));
}
@Override
@ForceInline
public byte readVolatileByte(long offset) {
return memory.readVolatileByte(address + translate(offset));
}
@Override
@ForceInline
public short readVolatileShort(long offset) {
return memory.readVolatileShort(address + translate(offset));
}
@Override
@ForceInline
public int readVolatileInt(long offset) {
return memory.readVolatileInt(address + translate(offset));
}
@Override
@ForceInline
public long readVolatileLong(long offset) {
return memory.readVolatileLong(address + translate(offset));
}
@NotNull
@Override
@ForceInline
public NativeBytesStore<Underlying> writeByte(long offset, byte i8) {
memory.writeByte(address + translate(offset), i8);
return this;
}
@NotNull
@Override
@ForceInline
public NativeBytesStore<Underlying> writeShort(long offset, short i16) {
memory.writeShort(address + translate(offset), i16);
return this;
}
@NotNull
@Override
@ForceInline
public NativeBytesStore<Underlying> writeInt(long offset, int i32) {
memory.writeInt(address + translate(offset), i32);
return this;
}
@NotNull
@Override
@ForceInline
public NativeBytesStore<Underlying> writeOrderedInt(long offset, int i) {
memory.writeOrderedInt(address + translate(offset), i);
return this;
}
@NotNull
@Override
@ForceInline
public NativeBytesStore<Underlying> writeLong(long offset, long i64) {
memory.writeLong(address + translate(offset), i64);
return this;
}
@NotNull
@Override
@ForceInline
public NativeBytesStore<Underlying> writeOrderedLong(long offset, long i) {
memory.writeOrderedLong(address + translate(offset), i);
return this;
}
@NotNull
@Override
@ForceInline
public NativeBytesStore<Underlying> writeFloat(long offset, float f) {
memory.writeFloat(address + translate(offset), f);
return this;
}
@NotNull
@Override
@ForceInline
public NativeBytesStore<Underlying> writeDouble(long offset, double d) {
memory.writeDouble(address + translate(offset), d);
return this;
}
@NotNull
@Override
@ForceInline
public NativeBytesStore<Underlying> writeVolatileByte(long offset, byte i8) {
memory.writeVolatileByte(address + translate(offset), i8);
return this;
}
@NotNull
@Override
@ForceInline
public NativeBytesStore<Underlying> writeVolatileShort(long offset, short i16) {
memory.writeVolatileShort(address + translate(offset), i16);
return this;
}
@NotNull
@Override
@ForceInline
public NativeBytesStore<Underlying> writeVolatileInt(long offset, int i32) {
memory.writeVolatileInt(address + translate(offset), i32);
return this;
}
@NotNull
@Override
@ForceInline
public NativeBytesStore<Underlying> writeVolatileLong(long offset, long i64) {
memory.writeVolatileLong(address + translate(offset), i64);
return this;
}
@NotNull
@Override
@ForceInline
public NativeBytesStore<Underlying> write(
long offsetInRDO, byte[] bytes, int offset, int length) {
memory.copyMemory(bytes, offset, address + translate(offsetInRDO), length);
return this;
}
@Override
@ForceInline
public void write(long offsetInRDO, @NotNull ByteBuffer bytes, int offset, int length) {
if (bytes.isDirect()) {
memory.copyMemory(((DirectBuffer) bytes).address(), address + translate(offsetInRDO), length);
} else {
memory.copyMemory(bytes.array(), offset, address + translate(offsetInRDO), length);
}
}
@NotNull
@Override
@ForceInline
public NativeBytesStore<Underlying> write(
long offsetInRDO, @NotNull RandomDataInput bytes, long offset, long length)
throws BufferOverflowException, BufferUnderflowException, IORuntimeException {
// TODO optimize, call unsafe.copyMemory when possible, copy 4, 2 bytes at once
long i = 0;
for (; i < length - 7; i += 8) {
writeLong(offsetInRDO + i, bytes.readLong(offset + i));
}
for (; i < length; i++) {
writeByte(offsetInRDO + i, bytes.readByte(offset + i));
}
return this;
}
@Override
public long address(long offset) throws UnsupportedOperationException {
if (offset < start() || offset >= capacity()) throw new IllegalArgumentException();
return address + translate(offset);
}
private void performRelease() {
if (refCount.get() > 0) {
LOGGER.info("NativeBytesStore discarded without releasing ", createdHere);
}
memory = null;
if (cleaner != null) cleaner.clean();
}
@NotNull
@Override
public String toString() {
try {
return BytesInternal.toString(this);
} catch (IllegalStateException | IORuntimeException e) {
return e.toString();
}
}
@Override
@ForceInline
public void nativeRead(long position, long address, long size) {
// TODO add bounds checking.
OS.memory().copyMemory(address(position), address, size);
}
@Override
@ForceInline
public void nativeWrite(long address, long position, long size) {
// TODO add bounds checking.
this.memory.copyMemory(address, address(position), size);
}
void write8bit(long position, char[] chars, int offset, int length) {
long addr = address + translate(position);
Memory memory = this.memory;
for (int i = 0; i < length; i++) memory.writeByte(addr + i, (byte) chars[offset + i]);
}
void read8bit(long position, char[] chars, int length) {
long addr = address + translate(position);
Memory memory = OS.memory();
for (int i = 0; i < length; i++) chars[i] = (char) (memory.readByte(addr + i) & 0xFF);
}
public long readIncompleteLong(long offset) {
int remaining = (int) Math.min(8, readRemaining() - offset);
long l = 0;
for (int i = 0; i < remaining; i++) {
byte b = memory.readByte(address + offset + i);
l |= (long) (b & 0xFF) << (i * 8);
}
return l;
}
@Override
public boolean equals(Object obj) {
try {
return obj instanceof BytesStore && BytesInternal.contentEqual(this, (BytesStore) obj);
} catch (IORuntimeException e) {
throw new AssertionError(e);
}
}
public void setAddress(long address) {
if ((address & ~0x3FFF) == 0)
throw new AssertionError("Invalid address " + Long.toHexString(address));
this.address = address;
}
public long appendUTF(long pos, char[] chars, int offset, int length) {
long address = this.address + translate(0);
Memory memory = this.memory;
int i;
ascii:
{
for (i = 0; i < length; i++) {
char c = chars[offset + i];
if (c > 0x007F) break ascii;
memory.writeByte(address + pos++, (byte) c);
}
return pos;
}
return appendUTF0(pos, chars, offset, length, i);
}
private long appendUTF0(long pos, char[] chars, int offset, int length, int i) {
for (; i < length; i++) {
char c = chars[offset + i];
if (c <= 0x007F) {
writeByte(pos++, (byte) c);
} else if (c <= 0x07FF) {
writeByte(pos++, (byte) (0xC0 | ((c >> 6) & 0x1F)));
writeByte(pos++, (byte) (0x80 | c & 0x3F));
} else {
writeByte(pos++, (byte) (0xE0 | ((c >> 12) & 0x0F)));
writeByte(pos++, (byte) (0x80 | ((c >> 6) & 0x3F)));
writeByte(pos++, (byte) (0x80 | (c & 0x3F)));
}
}
return pos;
}
static class Deallocator implements Runnable {
private volatile long address, size;
Deallocator(long address, long size) {
assert address != 0;
this.address = address;
this.size = size;
}
@Override
public void run() {
if (address == 0) return;
address = 0;
OS.memory().freeMemory(address, size);
}
}
}
@Override
public void release() throws IllegalStateException {
refCount.release();
if (Jvm.isDebug() && refCount.get() == 0) releasedHere = new Error("Released here");
}