Package org.apache.ignite.shaded.internal.util

Class GridUnsafe

java.lang.Object
org.apache.ignite.shaded.internal.util.GridUnsafe
public abstract class GridUnsafe extends Object

Wrapper for Unsafe class.

The following statements for memory access operations are true:

  • All putXxx(long addr, xxx val), getXxx(long addr), putXxx(byte[] arr, long off, xxx val), getXxx(byte[] arr, long off) and corresponding methods with LE suffix are alignment aware and can be safely used with unaligned pointers.
  • All putXxxField(Object obj, long fieldOff, xxx val) and getXxxField(Object obj, long fieldOff) methods are not alignment aware and can't be safely used with unaligned pointers. This methods can be safely used for object field values access because all object fields addresses are aligned.
  • All putXxxLE(...) and getXxxLE(...) methods assumes that byte order is fixed as little-endian while native byte order is big-endian. So it is client code responsibility to check native byte order before invoking of this methods.

TODO Remove after new version of Ignite is released. Copied from https://github.com/apache/ignite/commit/d837b749962583d30db8ad1ecc512d98887f3895 and formatted. Applied https://github.com/apache/ignite/commit/fc51f0e43275953ab6a77c7f4d10ba32d1a640b6 from https://github.com/apache/ignite/pull/10764

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final int
    ADDR_SIZE
    Address size.
    static final boolean
    BIG_ENDIAN
    Big endian.
    static final long
    BOOLEAN_ARR_OFF
     
    static final int
    BYTE_ARR_INT_OFF
     
    static final long
    BYTE_ARR_OFF
     
    static final long
    CHAR_ARR_OFF
     
    static final long
    DFLT_MEMORY_PER_BYTE_COPY_THRESHOLD
     
    static final long
    DOUBLE_ARR_OFF
     
    static final long
    FLOAT_ARR_OFF
     
    static final long
    INT_ARR_OFF
     
    static final long
    LONG_ARR_OFF
     
    static final ByteOrder
    NATIVE_BYTE_ORDER
     
    static final long
    SHORT_ARR_OFF
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static ByteBuffer
    allocateBuffer(int len)
     
    static Object
    allocateInstance(Class cls)
    Allocates instance of given class.
    static long
    allocateMemory(long size)
    Allocates memory.
    static int
    arrayBaseOffset(Class cls)
    Returns the offset of the first element in the storage allocation of a given array class.
    static int
    arrayIndexScale(Class<?> cls)
    Returns the scale factor for addressing elements in the storage allocation of a given array class.
    static long
    bufferAddress(ByteBuffer buf)
    Returns address of Buffer instance.
    static void
    cleanDirectBuffer(ByteBuffer buf)
    Cleans direct java.nio.ByteBuffer
    static boolean
    compareAndSwapInt(Object obj, long off, int exp, int upd)
    Integer CAS.
    static boolean
    compareAndSwapLong(Object obj, long off, long exp, long upd)
    Long CAS.
    static void
    copyHeapOffheap(Object srcBase, long srcOff, long dstAddr, long len)
    Copy memory from heap to offheap.
    static void
    copyMemory(long src, long dst, long len)
    Copies memory.
    static void
    copyMemory(Object srcBase, long srcOff, Object dstBase, long dstOff, long len)
    Sets all bytes in a given block of memory to a copy of another block.
    static void
    copyOffheapHeap(long srcAddr, Object dstBase, long dstOff, long len)
    Copy memory from offheap to heap.
    static void
    copyOffheapOffheap(long srcAddr, long dstAddr, long len)
    Copy memory between offheap locations.
    static int
    decrementAndGetInt(long ptr)
    Atomically increments value stored in an integer pointed by ptr.
    static void
    freeBuffer(ByteBuffer buf)
     
    static void
    freeMemory(long addr)
    Frees memory.
    static boolean
    getBoolean(byte[] arr, long off)
    Gets boolean value from byte array.
    static boolean
    getBooleanField(Object obj, long fieldOff)
    Gets boolean value from object field.
    static byte
    getByte(byte[] arr, long off)
    Gets byte value from byte array.
    static byte
    getByte(long addr)
    Gets byte value from given address.
    static byte
    getByteField(Object obj, long fieldOff)
    Gets byte value from object field.
    static byte
    getByteVolatile(Object obj, long off)
    Gets byte value with volatile semantic.
    static char
    getChar(byte[] arr, long off)
    Gets char value from byte array.
    static char
    getChar(long addr)
    Gets char value from given address.
    static char
    getCharField(Object obj, long fieldOff)
    Gets char value from object field.
    static char
    getCharLE(byte[] arr, long off)
    Gets char value from byte array assuming that value stored in little-endian byte order and native byte order is big-endian.
    static char
    getCharLE(long addr)
    Gets char value from given address assuming that value stored in little-endian byte order and native byte order is big-endian.
    static double
    getDouble(byte[] arr, long off)
    Gets double value from byte array.
    static double
    getDouble(long addr)
    Gets double value from given address.
    static double
    getDoubleField(Object obj, long fieldOff)
    Gets double value from object field.
    static double
    getDoubleLE(byte[] arr, long off)
    Gets double value from byte array assuming that value stored in little-endian byte order and native byte order is big-endian.
    static double
    getDoubleLE(long addr)
    Gets double value from given address assuming that value stored in little-endian byte order and native byte order is big-endian.
    static float
    getFloat(byte[] arr, long off)
    Gets float value from byte array.
    static float
    getFloat(long addr)
    Gets float value from given address.
    static float
    getFloatField(Object obj, long fieldOff)
    Gets float value from object field.
    static float
    getFloatLE(byte[] arr, long off)
    Gets float value from byte array assuming that value stored in little-endian byte order and native byte order is big-endian.
    static float
    getFloatLE(long addr)
    Gets float value from given address assuming that value stored in little-endian byte order and native byte order is big-endian.
    static int
    getInt(byte[] arr, long off)
    Gets integer value from byte array.
    static int
    getInt(long addr)
    Gets integer value from given address.
    static int
    getIntField(Object obj, long fieldOff)
    Gets integer value from object field.
    static int
    getIntLE(byte[] arr, long off)
    Gets integer value from byte array assuming that value stored in little-endian byte order and native byte order is big-endian.
    static int
    getIntLE(long addr)
    Gets integer value from given address assuming that value stored in little-endian byte order and native byte order is big-endian.
    static int
    getIntVolatile(Object obj, long off)
    Gets integer value with volatile semantic.
    static long
    getLong(byte[] arr, long off)
    Gets long value from byte array.
    static long
    getLong(long addr)
    Gets long value from given address.
    static long
    getLongField(Object obj, long fieldOff)
    Gets long value from object field.
    static long
    getLongLE(byte[] arr, long off)
    Gets long value from byte array assuming that value stored in little-endian byte order and native byte order is big-endian.
    static long
    getLongLE(long addr)
    Gets long value from given address assuming that value stored in little-endian byte order and native byte order is big-endian.
    static long
    getLongVolatile(Object obj, long off)
    Gets long value with volatile semantic.
    static Object
    getObjectField(Object obj, long fieldOff)
    Gets reference from object field.
    static short
    getShort(byte[] arr, long off)
    Gets short value from byte array.
    static short
    getShort(long addr)
    Gets short value from given address.
    static short
    getShortField(Object obj, long fieldOff)
    Gets short value from object field.
    static short
    getShortLE(byte[] arr, long off)
    Gets short value from byte array assuming that value stored in little-endian byte order and native byte order is big-endian.
    static short
    getShortLE(long addr)
    Gets short value from given address assuming that value stored in little-endian byte order and native byte order is big-endian.
    static int
    incrementAndGetInt(long ptr)
    Atomically increments value stored in an integer pointed by ptr.
    static Object
    invoke(Method mtd, Object... args)
    Invokes some method on sun.misc.Unsafe instance.
    static long
    objectFieldOffset(Field field)
    Returns object field offset.
    static int
    pageSize()
    Returns page size.
    static void
    putBoolean(byte[] arr, long off, boolean val)
    Stores boolean value into byte array.
    static void
    putBooleanField(Object obj, long fieldOff, boolean val)
    Stores boolean value into object field.
    static void
    putByte(byte[] arr, long off, byte val)
    Stores byte value into byte array.
    static void
    putByte(long addr, byte val)
    Stores given byte value.
    static void
    putByteField(Object obj, long fieldOff, byte val)
    Stores byte value into object field.
    static void
    putByteVolatile(Object obj, long off, byte val)
    Stores byte value with volatile semantic.
    static void
    putChar(byte[] arr, long off, char val)
    Stores char value into byte array.
    static void
    putChar(long addr, char val)
    Stores given char value.
    static void
    putCharField(Object obj, long fieldOff, char val)
    Stores char value into object field.
    static void
    putCharLE(byte[] arr, long off, char val)
    Stores char value into byte array assuming that value should be stored in little-endian byte order and native byte order is big-endian.
    static void
    putCharLE(long addr, char val)
    Stores given char value assuming that value should be stored in little-endian byte order and native byte order is big-endian.
    static void
    putDouble(byte[] arr, long off, double val)
    Stores double value into byte array.
    static void
    putDouble(long addr, double val)
    Stores given double value.
    static void
    putDoubleField(Object obj, long fieldOff, double val)
    Stores double value into object field.
    static void
    putDoubleLE(byte[] arr, long off, double val)
    Stores double value into byte array assuming that value should be stored in little-endian byte order and native byte order is big-endian.
    static void
    putDoubleLE(long addr, double val)
    Stores given double value assuming that value should be stored in little-endian byte order and native byte order is big-endian.
    static void
    putFloat(byte[] arr, long off, float val)
    Stores float value into byte array.
    static void
    putFloat(long addr, float val)
    Stores given float value.
    static void
    putFloatField(Object obj, long fieldOff, float val)
    Stores float value into object field.
    static void
    putFloatLE(byte[] arr, long off, float val)
    Stores float value into byte array assuming that value should be stored in little-endian byte order and native byte order is big-endian.
    static void
    putFloatLE(long addr, float val)
    Stores given float value assuming that value should be stored in little-endian byte order and native byte order is big-endian.
    static void
    putInt(byte[] arr, long off, int val)
    Stores integer value into byte array.
    static void
    putInt(long addr, int val)
    Stores given integer value.
    static void
    putIntField(Object obj, long fieldOff, int val)
    Stores integer value into object field.
    static void
    putIntLE(byte[] arr, long off, int val)
    Stores integer value into byte array assuming that value should be stored in little-endian byte order and native byte order is big-endian.
    static void
    putIntLE(long addr, int val)
    Stores given integer value assuming that value should be stored in little-endian byte order and native byte order is big-endian.
    static void
    putIntVolatile(Object obj, long off, int val)
    Stores integer value with volatile semantic.
    static void
    putLong(byte[] arr, long off, long val)
    Stores long value into byte array.
    static void
    putLong(long addr, long val)
    Stores given integer value.
    static void
    putLongField(Object obj, long fieldOff, long val)
    Stores long value into object field.
    static void
    putLongLE(byte[] arr, long off, long val)
    Stores long value into byte array assuming that value should be stored in little-endian byte order and native byte order is big-endian.
    static void
    putLongLE(long addr, long val)
    Stores given integer value assuming that value should be stored in little-endian byte order and native byte order is big-endian.
    static void
    putLongVolatile(Object obj, long off, long val)
    Stores long value with volatile semantic.
    static void
    putObjectField(Object obj, long fieldOff, Object val)
    Stores reference value into object field.
    static void
    putObjectVolatile(Object obj, long off, Object val)
    Stores reference value with volatile semantic.
    static void
    putShort(byte[] arr, long off, short val)
    Stores short value into byte array.
    static void
    putShort(long addr, short val)
    Stores given short value.
    static void
    putShortField(Object obj, long fieldOff, short val)
    Stores short value into object field.
    static void
    putShortLE(byte[] arr, long off, short val)
    Stores short value into byte array assuming that value should be stored in little-endian byte order and native byte order is big-endian.
    static void
    putShortLE(long addr, short val)
    Stores given short value assuming that value should be stored in little-endian byte order and native byte order is big-endian.
    static ByteBuffer
    reallocateBuffer(ByteBuffer buf, int len)
     
    static long
    reallocateMemory(long addr, long len)
    Reallocates memory.
    static void
    setMemory(long addr, long len, byte val)
    Fills memory with given value.
    static Object
    staticFieldBase(Field field)
    Returns static field base.
    static long
    staticFieldOffset(Field field)
    Returns static field offset.
    static ByteBuffer
    wrapPointer(long ptr, int len)
    Wraps pointer to unmanaged memory into direct byte buffer.
    static void
    zeroMemory(long addr, long len)
    Fills memory with zeroes.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

    • NATIVE_BYTE_ORDER

      public static final ByteOrder NATIVE_BYTE_ORDER

    • DFLT_MEMORY_PER_BYTE_COPY_THRESHOLD

      public static final long DFLT_MEMORY_PER_BYTE_COPY_THRESHOLD
      See Also:

    • BIG_ENDIAN

      public static final boolean BIG_ENDIAN
      Big endian.

    • ADDR_SIZE

      public static final int ADDR_SIZE
      Address size.

    • BYTE_ARR_OFF

      public static final long BYTE_ARR_OFF

    • BYTE_ARR_INT_OFF

      public static final int BYTE_ARR_INT_OFF

    • SHORT_ARR_OFF

      public static final long SHORT_ARR_OFF

    • INT_ARR_OFF

      public static final long INT_ARR_OFF

    • LONG_ARR_OFF

      public static final long LONG_ARR_OFF

    • FLOAT_ARR_OFF

      public static final long FLOAT_ARR_OFF

    • DOUBLE_ARR_OFF

      public static final long DOUBLE_ARR_OFF

    • CHAR_ARR_OFF

      public static final long CHAR_ARR_OFF

    • BOOLEAN_ARR_OFF

      public static final long BOOLEAN_ARR_OFF

  • Method Details

    • wrapPointer

      public static ByteBuffer wrapPointer(long ptr, int len)
      Wraps pointer to unmanaged memory into direct byte buffer.
      Parameters:
      ptr - Pointer to wrap.
      len - Memory location length.
      Returns:
      Byte buffer wrapping the given memory.

    • allocateBuffer

      public static ByteBuffer allocateBuffer(int len)
      Parameters:
      len - Length.
      Returns:
      Allocated direct buffer.

    • freeBuffer

      public static void freeBuffer(ByteBuffer buf)
      Parameters:
      buf - Direct buffer allocated by allocateBuffer(int).

    • reallocateBuffer

      public static ByteBuffer reallocateBuffer(ByteBuffer buf, int len)
      Parameters:
      buf - Buffer.
      len - New length.
      Returns:
      Reallocated direct buffer.

    • getBooleanField

      public static boolean getBooleanField(Object obj, long fieldOff)
      Gets boolean value from object field.
      Parameters:
      obj - Object.
      fieldOff - Field offset.
      Returns:
      Boolean value from object field.

    • putBooleanField

      public static void putBooleanField(Object obj, long fieldOff, boolean val)
      Stores boolean value into object field.
      Parameters:
      obj - Object.
      fieldOff - Field offset.
      val - Value.

    • getByteField

      public static byte getByteField(Object obj, long fieldOff)
      Gets byte value from object field.
      Parameters:
      obj - Object.
      fieldOff - Field offset.
      Returns:
      Byte value from object field.

    • putByteField

      public static void putByteField(Object obj, long fieldOff, byte val)
      Stores byte value into object field.
      Parameters:
      obj - Object.
      fieldOff - Field offset.
      val - Value.

    • getShortField

      public static short getShortField(Object obj, long fieldOff)
      Gets short value from object field.
      Parameters:
      obj - Object.
      fieldOff - Field offset.
      Returns:
      Short value from object field.

    • putShortField

      public static void putShortField(Object obj, long fieldOff, short val)
      Stores short value into object field.
      Parameters:
      obj - Object.
      fieldOff - Field offset.
      val - Value.

    • getCharField

      public static char getCharField(Object obj, long fieldOff)
      Gets char value from object field.
      Parameters:
      obj - Object.
      fieldOff - Field offset.
      Returns:
      Char value from object field.

    • putCharField

      public static void putCharField(Object obj, long fieldOff, char val)
      Stores char value into object field.
      Parameters:
      obj - Object.
      fieldOff - Field offset.
      val - Value.

    • getIntField

      public static int getIntField(Object obj, long fieldOff)
      Gets integer value from object field.
      Parameters:
      obj - Object.
      fieldOff - Field offset.
      Returns:
      Integer value from object field.

    • putIntField

      public static void putIntField(Object obj, long fieldOff, int val)
      Stores integer value into object field.
      Parameters:
      obj - Object.
      fieldOff - Field offset.
      val - Value.

    • getLongField

      public static long getLongField(Object obj, long fieldOff)
      Gets long value from object field.
      Parameters:
      obj - Object.
      fieldOff - Field offset.
      Returns:
      Long value from object field.

    • putLongField

      public static void putLongField(Object obj, long fieldOff, long val)
      Stores long value into object field.
      Parameters:
      obj - Object.
      fieldOff - Field offset.
      val - Value.

    • getFloatField

      public static float getFloatField(Object obj, long fieldOff)
      Gets float value from object field.
      Parameters:
      obj - Object.
      fieldOff - Field offset.
      Returns:
      Float value from object field.

    • putFloatField

      public static void putFloatField(Object obj, long fieldOff, float val)
      Stores float value into object field.
      Parameters:
      obj - Object.
      fieldOff - Field offset.
      val - Value.

    • getDoubleField

      public static double getDoubleField(Object obj, long fieldOff)
      Gets double value from object field.
      Parameters:
      obj - Object.
      fieldOff - Field offset.
      Returns:
      Double value from object field.

    • putDoubleField

      public static void putDoubleField(Object obj, long fieldOff, double val)
      Stores double value into object field.
      Parameters:
      obj - Object.
      fieldOff - Field offset.
      val - Value.

    • getObjectField

      public static Object getObjectField(Object obj, long fieldOff)
      Gets reference from object field.
      Parameters:
      obj - Object.
      fieldOff - Field offset.
      Returns:
      Reference from object field.

    • putObjectField

      public static void putObjectField(Object obj, long fieldOff, Object val)
      Stores reference value into object field.
      Parameters:
      obj - Object.
      fieldOff - Field offset.
      val - Value.

    • getBoolean

      public static boolean getBoolean(byte[] arr, long off)
      Gets boolean value from byte array.
      Parameters:
      arr - Byte array.
      off - Offset.
      Returns:
      Boolean value from byte array.

    • putBoolean

      public static void putBoolean(byte[] arr, long off, boolean val)
      Stores boolean value into byte array.
      Parameters:
      arr - Byte array.
      off - Offset.
      val - Value.

    • getByte

      public static byte getByte(byte[] arr, long off)
      Gets byte value from byte array.
      Parameters:
      arr - Byte array.
      off - Offset.
      Returns:
      Byte value from byte array.

    • putByte

      public static void putByte(byte[] arr, long off, byte val)
      Stores byte value into byte array.
      Parameters:
      arr - Byte array.
      off - Offset.
      val - Value.

    • getShort

      public static short getShort(byte[] arr, long off)
      Gets short value from byte array. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      Returns:
      Short value from byte array.

    • putShort

      public static void putShort(byte[] arr, long off, short val)
      Stores short value into byte array. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      val - Value.

    • getChar

      public static char getChar(byte[] arr, long off)
      Gets char value from byte array. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      Returns:
      Char value from byte array.

    • putChar

      public static void putChar(byte[] arr, long off, char val)
      Stores char value into byte array. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      val - Value.

    • getInt

      public static int getInt(byte[] arr, long off)
      Gets integer value from byte array. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      Returns:
      Integer value from byte array.

    • putInt

      public static void putInt(byte[] arr, long off, int val)
      Stores integer value into byte array. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      val - Value.

    • getLong

      public static long getLong(byte[] arr, long off)
      Gets long value from byte array. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      Returns:
      Long value from byte array.

    • putLong

      public static void putLong(byte[] arr, long off, long val)
      Stores long value into byte array. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      val - Value.

    • getFloat

      public static float getFloat(byte[] arr, long off)
      Gets float value from byte array. Alignment aware.
      Parameters:
      arr - Object.
      off - Offset.
      Returns:
      Float value from byte array.

    • putFloat

      public static void putFloat(byte[] arr, long off, float val)
      Stores float value into byte array. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      val - Value.

    • getDouble

      public static double getDouble(byte[] arr, long off)
      Gets double value from byte array. Alignment aware.
      Parameters:
      arr - byte array.
      off - Offset.
      Returns:
      Double value from byte array. Alignment aware.

    • putDouble

      public static void putDouble(byte[] arr, long off, double val)
      Stores double value into byte array. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      val - Value.

    • getShortLE

      public static short getShortLE(byte[] arr, long off)
      Gets short value from byte array assuming that value stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      Returns:
      Short value from byte array.

    • putShortLE

      public static void putShortLE(byte[] arr, long off, short val)
      Stores short value into byte array assuming that value should be stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      val - Value.

    • getCharLE

      public static char getCharLE(byte[] arr, long off)
      Gets char value from byte array assuming that value stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      Returns:
      Char value from byte array.

    • putCharLE

      public static void putCharLE(byte[] arr, long off, char val)
      Stores char value into byte array assuming that value should be stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      val - Value.

    • getIntLE

      public static int getIntLE(byte[] arr, long off)
      Gets integer value from byte array assuming that value stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      Returns:
      Integer value from byte array.

    • putIntLE

      public static void putIntLE(byte[] arr, long off, int val)
      Stores integer value into byte array assuming that value should be stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      val - Value.

    • getLongLE

      public static long getLongLE(byte[] arr, long off)
      Gets long value from byte array assuming that value stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      Returns:
      Long value from byte array.

    • putLongLE

      public static void putLongLE(byte[] arr, long off, long val)
      Stores long value into byte array assuming that value should be stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      val - Value.

    • getFloatLE

      public static float getFloatLE(byte[] arr, long off)
      Gets float value from byte array assuming that value stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      Returns:
      Float value from byte array.

    • putFloatLE

      public static void putFloatLE(byte[] arr, long off, float val)
      Stores float value into byte array assuming that value should be stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      val - Value.

    • getDoubleLE

      public static double getDoubleLE(byte[] arr, long off)
      Gets double value from byte array assuming that value stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      Returns:
      Double value from byte array.

    • putDoubleLE

      public static void putDoubleLE(byte[] arr, long off, double val)
      Stores double value into byte array assuming that value should be stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      arr - Byte array.
      off - Offset.
      val - Value.

    • getByte

      public static byte getByte(long addr)
      Gets byte value from given address.
      Parameters:
      addr - Address.
      Returns:
      Byte value from given address.

    • putByte

      public static void putByte(long addr, byte val)
      Stores given byte value.
      Parameters:
      addr - Address.
      val - Value.

    • getShort

      public static short getShort(long addr)
      Gets short value from given address. Alignment aware.
      Parameters:
      addr - Address.
      Returns:
      Short value from given address.

    • putShort

      public static void putShort(long addr, short val)
      Stores given short value. Alignment aware.
      Parameters:
      addr - Address.
      val - Value.

    • getChar

      public static char getChar(long addr)
      Gets char value from given address. Alignment aware.
      Parameters:
      addr - Address.
      Returns:
      Char value from given address.

    • putChar

      public static void putChar(long addr, char val)
      Stores given char value. Alignment aware.
      Parameters:
      addr - Address.
      val - Value.

    • getInt

      public static int getInt(long addr)
      Gets integer value from given address. Alignment aware.
      Parameters:
      addr - Address.
      Returns:
      Integer value from given address.

    • putInt

      public static void putInt(long addr, int val)
      Stores given integer value. Alignment aware.
      Parameters:
      addr - Address.
      val - Value.

    • getLong

      public static long getLong(long addr)
      Gets long value from given address. Alignment aware.
      Parameters:
      addr - Address.
      Returns:
      Long value from given address.

    • putLong

      public static void putLong(long addr, long val)
      Stores given integer value. Alignment aware.
      Parameters:
      addr - Address.
      val - Value.

    • getFloat

      public static float getFloat(long addr)
      Gets float value from given address. Alignment aware.
      Parameters:
      addr - Address.
      Returns:
      Float value from given address.

    • putFloat

      public static void putFloat(long addr, float val)
      Stores given float value. Alignment aware.
      Parameters:
      addr - Address.
      val - Value.

    • getDouble

      public static double getDouble(long addr)
      Gets double value from given address. Alignment aware.
      Parameters:
      addr - Address.
      Returns:
      Double value from given address.

    • putDouble

      public static void putDouble(long addr, double val)
      Stores given double value. Alignment aware.
      Parameters:
      addr - Address.
      val - Value.

    • getShortLE

      public static short getShortLE(long addr)
      Gets short value from given address assuming that value stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      addr - Address.
      Returns:
      Short value from given address.

    • putShortLE

      public static void putShortLE(long addr, short val)
      Stores given short value assuming that value should be stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      addr - Address.
      val - Value.

    • getCharLE

      public static char getCharLE(long addr)
      Gets char value from given address assuming that value stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      addr - Address.
      Returns:
      Char value from given address.

    • putCharLE

      public static void putCharLE(long addr, char val)
      Stores given char value assuming that value should be stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      addr - Address.
      val - Value.

    • getIntLE

      public static int getIntLE(long addr)
      Gets integer value from given address assuming that value stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      addr - Address.
      Returns:
      Integer value from given address.

    • putIntLE

      public static void putIntLE(long addr, int val)
      Stores given integer value assuming that value should be stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      addr - Address.
      val - Value.

    • getLongLE

      public static long getLongLE(long addr)
      Gets long value from given address assuming that value stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      addr - Address.
      Returns:
      Long value from given address.

    • putLongLE

      public static void putLongLE(long addr, long val)
      Stores given integer value assuming that value should be stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      addr - Address.
      val - Value.

    • getFloatLE

      public static float getFloatLE(long addr)
      Gets float value from given address assuming that value stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      addr - Address.
      Returns:
      Float value from given address.

    • putFloatLE

      public static void putFloatLE(long addr, float val)
      Stores given float value assuming that value should be stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      addr - Address.
      val - Value.

    • getDoubleLE

      public static double getDoubleLE(long addr)
      Gets double value from given address assuming that value stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      addr - Address.
      Returns:
      Double value from given address.

    • putDoubleLE

      public static void putDoubleLE(long addr, double val)
      Stores given double value assuming that value should be stored in little-endian byte order and native byte order is big-endian. Alignment aware.
      Parameters:
      addr - Address.
      val - Value.

    • staticFieldOffset

      public static long staticFieldOffset(Field field)
      Returns static field offset.
      Parameters:
      field - Field.
      Returns:
      Static field offset.

    • objectFieldOffset

      public static long objectFieldOffset(Field field)
      Returns object field offset.
      Parameters:
      field - Field.
      Returns:
      Object field offset.

    • staticFieldBase

      public static Object staticFieldBase(Field field)
      Returns static field base.
      Parameters:
      field - Field.
      Returns:
      Static field base.

    • allocateMemory

      public static long allocateMemory(long size)
      Allocates memory.
      Parameters:
      size - Size.
      Returns:
      address.

    • reallocateMemory

      public static long reallocateMemory(long addr, long len)
      Reallocates memory.
      Parameters:
      addr - Address.
      len - Length.
      Returns:
      address.

    • setMemory

      public static void setMemory(long addr, long len, byte val)
      Fills memory with given value.
      Parameters:
      addr - Address.
      len - Length.
      val - Value.

    • zeroMemory

      public static void zeroMemory(long addr, long len)
      Fills memory with zeroes.
      Parameters:
      addr - Address.
      len - Length.

    • copyOffheapOffheap

      public static void copyOffheapOffheap(long srcAddr, long dstAddr, long len)
      Copy memory between offheap locations.
      Parameters:
      srcAddr - Source address.
      dstAddr - Destination address.
      len - Length.

    • copyOffheapHeap

      public static void copyOffheapHeap(long srcAddr, Object dstBase, long dstOff, long len)
      Copy memory from offheap to heap.
      Parameters:
      srcAddr - Source address.
      dstBase - Destination base.
      dstOff - Destination offset.
      len - Length.

    • copyHeapOffheap

      public static void copyHeapOffheap(Object srcBase, long srcOff, long dstAddr, long len)
      Copy memory from heap to offheap.
      Parameters:
      srcBase - Source base.
      srcOff - Source offset.
      dstAddr - Destination address.
      len - Length.

    • copyMemory

      public static void copyMemory(long src, long dst, long len)
      Copies memory.
      Parameters:
      src - Source.
      dst - Dst.
      len - Length.

    • copyMemory

      public static void copyMemory(Object srcBase, long srcOff, Object dstBase, long dstOff, long len)
      Sets all bytes in a given block of memory to a copy of another block.
      Parameters:
      srcBase - Source base.
      srcOff - Source offset.
      dstBase - Dst base.
      dstOff - Dst offset.
      len - Length.

    • freeMemory

      public static void freeMemory(long addr)
      Frees memory.
      Parameters:
      addr - Address.

    • arrayBaseOffset

      public static int arrayBaseOffset(Class cls)
      Returns the offset of the first element in the storage allocation of a given array class.
      Parameters:
      cls - Class.
      Returns:
      the offset of the first element in the storage allocation of a given array class.

    • arrayIndexScale

      public static int arrayIndexScale(Class<?> cls)
      Returns the scale factor for addressing elements in the storage allocation of a given array class.
      Parameters:
      cls - Class.
      Returns:
      the scale factor for addressing elements in the storage allocation of a given array class.

    • allocateInstance

      public static Object allocateInstance(Class cls) throws InstantiationException
      Allocates instance of given class.
      Parameters:
      cls - Class.
      Returns:
      Allocated instance.
      Throws:
      InstantiationException

    • compareAndSwapInt

      public static boolean compareAndSwapInt(Object obj, long off, int exp, int upd)
      Integer CAS.
      Parameters:
      obj - Object.
      off - Offset.
      exp - Expected.
      upd - Upd.
      Returns:
      True if operation completed successfully, false - otherwise.

    • compareAndSwapLong

      public static boolean compareAndSwapLong(Object obj, long off, long exp, long upd)
      Long CAS.
      Parameters:
      obj - Object.
      off - Offset.
      exp - Expected.
      upd - Upd.
      Returns:
      True if operation completed successfully, false - otherwise.

    • incrementAndGetInt

      public static int incrementAndGetInt(long ptr)
      Atomically increments value stored in an integer pointed by ptr.
      Parameters:
      ptr - Pointer to an integer.
      Returns:
      Updated value.

    • decrementAndGetInt

      public static int decrementAndGetInt(long ptr)
      Atomically increments value stored in an integer pointed by ptr.
      Parameters:
      ptr - Pointer to an integer.
      Returns:
      Updated value.

    • getByteVolatile

      public static byte getByteVolatile(Object obj, long off)
      Gets byte value with volatile semantic.
      Parameters:
      obj - Object.
      off - Offset.
      Returns:
      Byte value.

    • putByteVolatile

      public static void putByteVolatile(Object obj, long off, byte val)
      Stores byte value with volatile semantic.
      Parameters:
      obj - Object.
      off - Offset.
      val - Value.

    • getIntVolatile

      public static int getIntVolatile(Object obj, long off)
      Gets integer value with volatile semantic.
      Parameters:
      obj - Object.
      off - Offset.
      Returns:
      Integer value.

    • putIntVolatile

      public static void putIntVolatile(Object obj, long off, int val)
      Stores integer value with volatile semantic.
      Parameters:
      obj - Object.
      off - Offset.
      val - Value.

    • getLongVolatile

      public static long getLongVolatile(Object obj, long off)
      Gets long value with volatile semantic.
      Parameters:
      obj - Object.
      off - Offset.
      Returns:
      Long value.

    • putLongVolatile

      public static void putLongVolatile(Object obj, long off, long val)
      Stores long value with volatile semantic.
      Parameters:
      obj - Object.
      off - Offset.
      val - Value.

    • putObjectVolatile

      public static void putObjectVolatile(Object obj, long off, Object val)
      Stores reference value with volatile semantic.
      Parameters:
      obj - Object.
      off - Offset.
      val - Value.

    • pageSize

      public static int pageSize()
      Returns page size.
      Returns:
      Page size.

    • bufferAddress

      public static long bufferAddress(ByteBuffer buf)
      Returns address of Buffer instance.
      Parameters:
      buf - Buffer.
      Returns:
      Buffer memory address.

    • invoke

      public static Object invoke(Method mtd, Object... args)
      Invokes some method on sun.misc.Unsafe instance.
      Parameters:
      mtd - Method.
      args - Arguments.

    • cleanDirectBuffer

      public static void cleanDirectBuffer(ByteBuffer buf)
      Cleans direct java.nio.ByteBuffer
      Parameters:
      buf - Direct buffer.