com.oracle.graal.compiler.common.util

Class UnsafeArrayTypeReader

java.lang.Object

com.oracle.graal.compiler.common.util.UnsafeArrayTypeReader

All Implemented Interfaces:

TypeReader

Direct Known Subclasses:

AlignedUnsafeArrayTypeReader, UnalignedUnsafeArrayTypeReader

public abstract class UnsafeArrayTypeReader
extends Object
implements TypeReader

Provides low-level read access from a byte[] array for signed and unsigned values of size 1, 2, 4, and 8 bytes. The class can either be instantiated for sequential access to the byte[] array; or static methods can be used to read values without the overhead of creating an instance. 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 long	byteIndex
protected byte[]	data

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	UnsafeArrayTypeReader(byte[] data, long byteIndex)

Method Summary

Modifier and Type	Method and Description
static UnsafeArrayTypeReader	create(byte[] data, long byteIndex, boolean supportsUnalignedMemoryAccess)
long	getByteIndex() Returns the next byte index to be read.
int	getS1() Reads a signed 1 byte value.
static int	getS1(byte[] data, long byteIndex)
static int	getS2(byte[] data, long byteIndex, boolean supportsUnalignedMemoryAccess)
static int	getS4(byte[] data, long byteIndex, boolean supportsUnalignedMemoryAccess)
static long	getS8(byte[] data, long byteIndex, boolean supportsUnalignedMemoryAccess)
int	getU1() Reads an unsigned 1 byte value.
static int	getU1(byte[] data, long byteIndex)
int	getU2() Reads an unsigned 2 byte value.
static int	getU2(byte[] data, long byteIndex, boolean supportsUnalignedMemoryAccess)
long	getU4() Reads an unsigned 4 byte value.
static long	getU4(byte[] data, long byteIndex, boolean supportsUnalignedMemoryAccess)
protected static long	readOffset(byte[] data, long byteIndex, int numBytes)
void	setByteIndex(long byteIndex) Sets the next byte index to be read.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.oracle.graal.compiler.common.util.TypeReader

getS2, getS4, getS8, getSV, getSVInt, getUV, getUVInt

Field Detail

data

protected final byte[] data

byteIndex

protected long byteIndex

Constructor Detail

UnsafeArrayTypeReader

protected UnsafeArrayTypeReader(byte[] data,
                                long byteIndex)

Method Detail

getS1

public static int getS1(byte[] data,
                        long byteIndex)

getU1

public static int getU1(byte[] data,
                        long byteIndex)

getS2

public static int getS2(byte[] data,
                        long byteIndex,
                        boolean supportsUnalignedMemoryAccess)

getU2

public static int getU2(byte[] data,
                        long byteIndex,
                        boolean supportsUnalignedMemoryAccess)

getS4

public static int getS4(byte[] data,
                        long byteIndex,
                        boolean supportsUnalignedMemoryAccess)

getU4

public static long getU4(byte[] data,
                         long byteIndex,
                         boolean supportsUnalignedMemoryAccess)

getS8

public static long getS8(byte[] data,
                         long byteIndex,
                         boolean supportsUnalignedMemoryAccess)

readOffset

protected static long readOffset(byte[] data,
                                 long byteIndex,
                                 int numBytes)

create

public static UnsafeArrayTypeReader create(byte[] data,
                                           long byteIndex,
                                           boolean supportsUnalignedMemoryAccess)

getByteIndex

public long getByteIndex()

Description copied from interface: TypeReader

Returns the next byte index to be read.

Specified by:

getByteIndex in interface TypeReader

setByteIndex

public void setByteIndex(long byteIndex)

Description copied from interface: TypeReader

Sets the next byte index to be read.

Specified by:

setByteIndex in interface TypeReader

getS1

public final int getS1()

Description copied from interface: TypeReader

Reads a signed 1 byte value.

Specified by:

getS1 in interface TypeReader

getU1

public final int getU1()

Description copied from interface: TypeReader

Reads an unsigned 1 byte value.

Specified by:

getU1 in interface TypeReader

getU2

public final int getU2()

Description copied from interface: TypeReader

Reads an unsigned 2 byte value.

Specified by:

getU2 in interface TypeReader

getU4

public final long getU4()

Description copied from interface: TypeReader

Reads an unsigned 4 byte value.

Specified by:

getU4 in interface TypeReader