UnsafeArrayTypeWriter

java.lang.Object
- org.graalvm.compiler.core.common.util.UnsafeArrayTypeWriter

All Implemented Interfaces:

TypeWriter
```
public abstract class UnsafeArrayTypeWriter
extends Object
implements TypeWriter
```
Provides low-level sequential write access to a byte[] array for signed and unsigned values of size 1, 2, 4, and 8 bytes. To avoid copying an array when the buffer size is no longer sufficient, the buffer is split into chunks of a fixed size. The flag supportsUnalignedMemoryAccess must be set according to the capabilities of the hardware architecture: the value true allows more efficient memory access on architectures that support unaligned memory accesses; the value false is the safe fallback that works on every hardware.

Field Summary

Fields
Modifier and Type	Field and Description
`protected org.graalvm.compiler.core.common.util.UnsafeArrayTypeWriter.Chunk`	`firstChunk`
`static long`	`HIGH_WORD_SHIFT`
`static long`	`MAX_BYTES`
`static long`	`NUM_HIGH_CODES`
`static long`	`NUM_LOW_CODES`
`protected int`	`totalSize`
`protected org.graalvm.compiler.core.common.util.UnsafeArrayTypeWriter.Chunk`	`writeChunk`

Constructor Summary

Constructors
Modifier Constructor and Description

protected UnsafeArrayTypeWriter()

Constructors
Modifier	Constructor and Description
`protected`	`UnsafeArrayTypeWriter()`

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and Description
`static UnsafeArrayTypeWriter`	`create(boolean supportsUnalignedMemoryAccess)`
`static UnsafeArrayTypeWriter`	`create(boolean supportsUnalignedMemoryAccess, boolean bigEndian)`
`long`	`getBytesWritten()` Returns the number of bytes that have been written, i.e., the byte index of the next byte to be written.
`void`	`patchS4(long value, long offset)` Patches a previously written signed 4 byte value at a given offset.
`void`	`putS1(long value)` Writes a signed 1 byte value.
`void`	`putS2(long value)` Writes a signed 2 byte value.
`protected abstract void`	`putS2(long value, org.graalvm.compiler.core.common.util.UnsafeArrayTypeWriter.Chunk chunk, long offset)`
`void`	`putS4(long value)` Writes a signed 4 byte value.
`protected abstract void`	`putS4(long value, org.graalvm.compiler.core.common.util.UnsafeArrayTypeWriter.Chunk chunk, long offset)`
`void`	`putS8(long value)` Writes a signed 8 byte value.
`protected abstract void`	`putS8(long value, org.graalvm.compiler.core.common.util.UnsafeArrayTypeWriter.Chunk chunk, long offset)`
`void`	`putSV(long value)` Writes a signed value in a variable byte size encoding.
`void`	`putU1(long value)` Writes an unsigned 1 byte value.
`void`	`putU2(long value)` Writes an unsigned 2 byte value.
`void`	`putU4(long value)` Writes an unsigned 4 byte value.
`void`	`putUV(long value)` Writes an unsigned value in a variable byte size encoding.
`byte[]`	`toArray()`
`byte[]`	`toArray(byte[] result)` Copies the buffer into the provided byte[] array of length `UnsafeArrayTypeWriter.getBytesWritten()`.
`ByteBuffer`	`toByteBuffer(ByteBuffer buffer)` Copies the buffer into the provided ByteBuffer at its current position.
`protected long`	`writeOffset(int writeBytes)`

Methods inherited from class java.lang.Object
clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - HIGH_WORD_SHIFT
```
public static final long HIGH_WORD_SHIFT
```
    See Also:
    
    Constant Field Values
  - NUM_HIGH_CODES
```
public static final long NUM_HIGH_CODES
```
    See Also:
    
    Constant Field Values
  - NUM_LOW_CODES
```
public static final long NUM_LOW_CODES
```
    See Also:
    
    Constant Field Values
  - MAX_BYTES
```
public static final long MAX_BYTES
```
    See Also:
    
    Constant Field Values
  - firstChunk
```
protected final org.graalvm.compiler.core.common.util.UnsafeArrayTypeWriter.Chunk firstChunk
```
  - writeChunk
```
protected org.graalvm.compiler.core.common.util.UnsafeArrayTypeWriter.Chunk writeChunk
```
  - totalSize
```
protected int totalSize
```
- Constructor Detail
  - UnsafeArrayTypeWriter
```
protected UnsafeArrayTypeWriter()
```
- Method Detail
  - create
```
public static UnsafeArrayTypeWriter create(boolean supportsUnalignedMemoryAccess)
```
  - create
```
public static UnsafeArrayTypeWriter create(boolean supportsUnalignedMemoryAccess,
                                           boolean bigEndian)
```
  - getBytesWritten
```
public final long getBytesWritten()
```
    Description copied from interface: TypeWriter
    
    Returns the number of bytes that have been written, i.e., the byte index of the next byte to be written.
    
    Specified by:
    
    getBytesWritten in interface TypeWriter
  - toArray
```
public final byte[] toArray(byte[] result)
```
    Copies the buffer into the provided byte[] array of length UnsafeArrayTypeWriter.getBytesWritten().
  - toByteBuffer
```
public final ByteBuffer toByteBuffer(ByteBuffer buffer)
```
    Copies the buffer into the provided ByteBuffer at its current position.
  - toArray
```
public final byte[] toArray()
```
  - putS1
```
public final void putS1(long value)
```
    Description copied from interface: TypeWriter
    
    Writes a signed 1 byte value.
    
    Specified by:
    
    putS1 in interface TypeWriter
  - putU1
```
public final void putU1(long value)
```
    Description copied from interface: TypeWriter
    
    Writes an unsigned 1 byte value.
    
    Specified by:
    
    putU1 in interface TypeWriter
  - putU2
```
public final void putU2(long value)
```
    Description copied from interface: TypeWriter
    
    Writes an unsigned 2 byte value.
    
    Specified by:
    
    putU2 in interface TypeWriter
  - putU4
```
public final void putU4(long value)
```
    Description copied from interface: TypeWriter
    
    Writes an unsigned 4 byte value.
    
    Specified by:
    
    putU4 in interface TypeWriter
  - putS2
```
public void putS2(long value)
```
    Description copied from interface: TypeWriter
    
    Writes a signed 2 byte value.
    
    Specified by:
    
    putS2 in interface TypeWriter
  - putS4
```
public void putS4(long value)
```
    Description copied from interface: TypeWriter
    
    Writes a signed 4 byte value.
    
    Specified by:
    
    putS4 in interface TypeWriter
  - putS8
```
public void putS8(long value)
```
    Description copied from interface: TypeWriter
    
    Writes a signed 8 byte value.
    
    Specified by:
    
    putS8 in interface TypeWriter
  - putS2
```
protected abstract void putS2(long value,
                              org.graalvm.compiler.core.common.util.UnsafeArrayTypeWriter.Chunk chunk,
                              long offset)
```
  - putS4
```
protected abstract void putS4(long value,
                              org.graalvm.compiler.core.common.util.UnsafeArrayTypeWriter.Chunk chunk,
                              long offset)
```
  - putS8
```
protected abstract void putS8(long value,
                              org.graalvm.compiler.core.common.util.UnsafeArrayTypeWriter.Chunk chunk,
                              long offset)
```
  - writeOffset
```
protected long writeOffset(int writeBytes)
```
  - patchS4
```
public void patchS4(long value,
                    long offset)
```
    Description copied from interface: TypeWriter
    
    Patches a previously written signed 4 byte value at a given offset.
    
    Specified by:
    
    patchS4 in interface TypeWriter
  - putSV
```
public void putSV(long value)
```
    Description copied from interface: TypeWriter
    
    Writes a signed value in a variable byte size encoding.
    
    Specified by:
    
    putSV in interface TypeWriter
  - putUV
```
public void putUV(long value)
```
    Description copied from interface: TypeWriter
    
    Writes an unsigned value in a variable byte size encoding.
    
    Specified by:
    
    putUV in interface TypeWriter

Class UnsafeArrayTypeWriter

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

HIGH_WORD_SHIFT

NUM_HIGH_CODES

NUM_LOW_CODES

MAX_BYTES

firstChunk

writeChunk

totalSize

Constructor Detail

UnsafeArrayTypeWriter

Method Detail

create

create

getBytesWritten

toArray

toByteBuffer

toArray

putS1

putU1

putU2

putU4

putS2

putS4

putS8

putS2

putS4

putS8

writeOffset

patchS4

putSV

putUV