Package com.pnfsoftware.jeb.core.units.code.asm.processor.memory

Class EncodedMemoryAreaUtil

java.lang.Object

com.pnfsoftware.jeb.core.units.code.asm.processor.memory.EncodedMemoryAreaUtil

public class EncodedMemoryAreaUtil
extends Object

Utility routines for IEncodedMemoryArea.

Method Summary

Modifier and Type	Method	Description
static int	signExtendInt(byte[] code, IEncodedMemoryArea memoryAreas)	Decode and sign-extend an encoded area as an integer.
static long	signExtendLong(byte[] code, IEncodedMemoryArea memoryAreas)	Decode and sign-extend an encoded area as a long.
static long	zeroExtend(byte[] code, int index, int length)	Extract and zero-extend bits from instruction bytes.
static int	zeroExtend(byte[] code, IEncodedMemoryArea memoryArea)	Decode and zero-extend an encoded area as an integer.
static long	zeroExtendLong(byte[] code, IEncodedMemoryArea... memoryAreas)	Decode and zero-extend several adjacent encoded areas as a long.

Methods inherited from class java.lang.Object

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

Method Details

signExtendInt

public static int signExtendInt(byte[] code,
 IEncodedMemoryArea memoryAreas)

Decode and sign-extend an encoded area as an integer.

Parameters:

code - instruction bytes

memoryAreas - encoded memory area

Returns:

sign-extended value

signExtendLong

public static long signExtendLong(byte[] code,
 IEncodedMemoryArea memoryAreas)

Decode and sign-extend an encoded area as a long.

Parameters:

code - instruction bytes

memoryAreas - encoded memory area

Returns:

sign-extended value

zeroExtend

public static int zeroExtend(byte[] code,
 IEncodedMemoryArea memoryArea)

Decode and zero-extend an encoded area as an integer.

Parameters:

code - instruction bytes

memoryArea - encoded memory area

Returns:

zero-extended value

zeroExtendLong

public static long zeroExtendLong(byte[] code,
 IEncodedMemoryArea... memoryAreas)

Decode and zero-extend several adjacent encoded areas as a long.

Parameters:

code - instruction bytes

memoryAreas - encoded memory areas, from most significant to least significant

Returns:

zero-extended value

zeroExtend

public static long zeroExtend(byte[] code,
 int index,
 int length)

Extract and zero-extend bits from instruction bytes.

Parameters:

code - instruction bytes

index - bit index

length - length in bits

Returns:

zero-extended value