com.cmpware.fastmodel
Class Field

java.lang.Object
  com.cmpware.fastmodel.Field

public class Field
extends java.lang.Object

This class defines an instruction field used in the FastModel.

Copyright (c) 2006 Cmpware, Inc. All Rights Reserved.

Author:

SAG

Field Summary

protected int	bits The number of bits in the field
static java.lang.String	copyright Copyright string
protected int	startBit The start bit fo the field

Constructor Summary

Field(int bits, int startBit)
Constructor

Field(int bits, int startBit, Symbol[] symbols)
Constructor

Method Summary

static long	append(Field a, Field b, long instr) This static method appends two fields.
long	get(java.math.BigInteger instr) This method extracts the field data from an instruction.
static long	get(java.math.BigInteger a, int bits, int startBit) This static method extracts a field from a big integer.
long	get(long instr) This method extracts the field data from an instruction.
java.lang.Long	symbolLookup(java.lang.String s) This method performs a lookup of a symbol.

Methods inherited from class java.lang.Object

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

Field Detail

copyright

public static final java.lang.String copyright

Copyright string

See Also:

Constant Field Values

bits

protected int bits

The number of bits in the field

startBit

protected int startBit

The start bit fo the field

Constructor Detail

Field

public Field(int bits,
             int startBit)

Constructor

Parameters:

bits - The number of bits in the field

startBit - The start bit of the field

Field

public Field(int bits,
             int startBit,
             Symbol[] symbols)

Constructor

Parameters:

bits - The number of bits in the field

startBit - The start bit of the field

symbols - a symbol table associated with this field.

Method Detail

get

public long get(long instr)

This method extracts the field data from an instruction.

Parameters:

instr - The instruction containing the field.

Returns:

This method returns the field data extracted from an instruction.

get

public long get(java.math.BigInteger instr)

This method extracts the field data from an instruction.

Parameters:

instr - The instruction containing the field.

Returns:

This method returns the field data extracted from an instruction.

symbolLookup

public java.lang.Long symbolLookup(java.lang.String s)

This method performs a lookup of a symbol.

Parameters:

s - the symbol string.

Returns:

the Long value associated with this symbol is returned. If there is no associated value, a null is returned.

append

public static long append(Field a,
                          Field b,
                          long instr)

This static method appends two fields. This is useful for non-contiguous fields sometimes found in instructions.

Parameters:

a - the fields containing the high bits.

b - the Field containing the low bits.

instr - The instruction containing the field.

Returns:

the appended fields are returned.

get

public static long get(java.math.BigInteger a,
                       int bits,
                       int startBit)

This static method extracts a field from a big integer.

Parameters:

a - the big integer containing the field

bits - The number of bits in the field

startBit - The start bit of the field

Returns:

the extracted field is returned.