Package libcore.io

Class Memory

java.lang.Object
libcore.io.Memory
public final class Memory
extends Object
Unsafe access to memory.

  • Method Summary

    Modifier and Type Method Description
    static void memmove​(Object dstObject, int dstOffset, Object srcObject, int srcOffset, long byteCount)
    Copies 'byteCount' bytes from the source to the destination.
    static byte peekByte​(long address)  
    static void peekByteArray​(long address, byte[] dst, int dstOffset, int byteCount)  
    static void peekCharArray​(long address, char[] dst, int dstOffset, int charCount, boolean swap)  
    static void peekDoubleArray​(long address, double[] dst, int dstOffset, int doubleCount, boolean swap)  
    static void peekFloatArray​(long address, float[] dst, int dstOffset, int floatCount, boolean swap)  
    static int peekInt​(byte[] src, int offset, ByteOrder order)  
    static int peekInt​(long address, boolean swap)  
    static void peekIntArray​(long address, int[] dst, int dstOffset, int intCount, boolean swap)  
    static long peekLong​(byte[] src, int offset, ByteOrder order)  
    static long peekLong​(long address, boolean swap)  
    static void peekLongArray​(long address, long[] dst, int dstOffset, int longCount, boolean swap)  
    static short peekShort​(byte[] src, int offset, ByteOrder order)  
    static short peekShort​(long address, boolean swap)  
    static void peekShortArray​(long address, short[] dst, int dstOffset, int shortCount, boolean swap)  
    static void pokeByte​(long address, byte value)  
    static void pokeByteArray​(long address, byte[] src, int offset, int count)  
    static void pokeCharArray​(long address, char[] src, int offset, int count, boolean swap)  
    static void pokeDoubleArray​(long address, double[] src, int offset, int count, boolean swap)  
    static void pokeFloatArray​(long address, float[] src, int offset, int count, boolean swap)  
    static void pokeInt​(byte[] dst, int offset, int value, ByteOrder order)  
    static void pokeInt​(long address, int value, boolean swap)  
    static void pokeIntArray​(long address, int[] src, int offset, int count, boolean swap)  
    static void pokeLong​(byte[] dst, int offset, long value, ByteOrder order)  
    static void pokeLong​(long address, long value, boolean swap)  
    static void pokeLongArray​(long address, long[] src, int offset, int count, boolean swap)  
    static void pokeShort​(byte[] dst, int offset, short value, ByteOrder order)  
    static void pokeShort​(long address, short value, boolean swap)  
    static void pokeShortArray​(long address, short[] src, int offset, int count, boolean swap)  
    static void unsafeBulkGet​(Object dst, int dstOffset, int byteCount, byte[] src, int srcOffset, int sizeofElements, boolean swap)
    Used to optimize nio heap buffer bulk get operations.
    static void unsafeBulkPut​(byte[] dst, int dstOffset, int byteCount, Object src, int srcOffset, int sizeofElements, boolean swap)
    Used to optimize nio heap buffer bulk put operations.

    Methods inherited from class java.lang.Object

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

  • Method Details

    • unsafeBulkGet

      public static void unsafeBulkGet​(Object dst, int dstOffset, int byteCount, byte[] src, int srcOffset, int sizeofElements, boolean swap)
      Used to optimize nio heap buffer bulk get operations. 'dst' must be a primitive array. 'dstOffset' is measured in units of 'sizeofElements' bytes.

    • unsafeBulkPut

      public static void unsafeBulkPut​(byte[] dst, int dstOffset, int byteCount, Object src, int srcOffset, int sizeofElements, boolean swap)
      Used to optimize nio heap buffer bulk put operations. 'src' must be a primitive array. 'srcOffset' is measured in units of 'sizeofElements' bytes.

    • peekInt

      public static int peekInt​(byte[] src, int offset, ByteOrder order)

    • peekLong

      public static long peekLong​(byte[] src, int offset, ByteOrder order)

    • peekShort

      public static short peekShort​(byte[] src, int offset, ByteOrder order)

    • pokeInt

      public static void pokeInt​(byte[] dst, int offset, int value, ByteOrder order)

    • pokeLong

      public static void pokeLong​(byte[] dst, int offset, long value, ByteOrder order)

    • pokeShort

      public static void pokeShort​(byte[] dst, int offset, short value, ByteOrder order)

    • memmove

      public static void memmove​(Object dstObject, int dstOffset, Object srcObject, int srcOffset, long byteCount)
      Copies 'byteCount' bytes from the source to the destination. The objects are either instances of DirectByteBuffer or byte[]. The offsets in the byte[] case must include the Buffer.arrayOffset if the array came from a Buffer.array call. We could make this private and provide the four type-safe variants, but then ByteBuffer.put(ByteBuffer) would need to work out which to call based on whether the source and destination buffers are direct or not.

    • peekByte

      public static byte peekByte​(long address)

    • peekInt

      public static int peekInt​(long address, boolean swap)

    • peekLong

      public static long peekLong​(long address, boolean swap)

    • peekShort

      public static short peekShort​(long address, boolean swap)

    • peekByteArray

      public static void peekByteArray​(long address, byte[] dst, int dstOffset, int byteCount)

    • peekCharArray

      public static void peekCharArray​(long address, char[] dst, int dstOffset, int charCount, boolean swap)

    • peekDoubleArray

      public static void peekDoubleArray​(long address, double[] dst, int dstOffset, int doubleCount, boolean swap)

    • peekFloatArray

      public static void peekFloatArray​(long address, float[] dst, int dstOffset, int floatCount, boolean swap)

    • peekIntArray

      public static void peekIntArray​(long address, int[] dst, int dstOffset, int intCount, boolean swap)

    • peekLongArray

      public static void peekLongArray​(long address, long[] dst, int dstOffset, int longCount, boolean swap)

    • peekShortArray

      public static void peekShortArray​(long address, short[] dst, int dstOffset, int shortCount, boolean swap)

    • pokeByte

      public static void pokeByte​(long address, byte value)

    • pokeInt

      public static void pokeInt​(long address, int value, boolean swap)

    • pokeLong

      public static void pokeLong​(long address, long value, boolean swap)

    • pokeShort

      public static void pokeShort​(long address, short value, boolean swap)

    • pokeByteArray

      public static void pokeByteArray​(long address, byte[] src, int offset, int count)

    • pokeCharArray

      public static void pokeCharArray​(long address, char[] src, int offset, int count, boolean swap)

    • pokeDoubleArray

      public static void pokeDoubleArray​(long address, double[] src, int offset, int count, boolean swap)

    • pokeFloatArray

      public static void pokeFloatArray​(long address, float[] src, int offset, int count, boolean swap)

    • pokeIntArray

      public static void pokeIntArray​(long address, int[] src, int offset, int count, boolean swap)

    • pokeLongArray

      public static void pokeLongArray​(long address, long[] src, int offset, int count, boolean swap)

    • pokeShortArray

      public static void pokeShortArray​(long address, short[] src, int offset, int count, boolean swap)