com.cmpware.fastmodel
Class NullFunction

java.lang.Object
  com.cmpware.fastmodel.Function
      com.cmpware.fastmodel.NullFunction

public class NullFunction
extends Function

This class defines the null function. It has a size zero and is used primarily at start-up to avoid null pointers.

Copyright (c) 2008 Cmpware, Inc. All Rights Reserved.

Author:

SAG

Field Summary

static java.lang.String

copyright Copyright string

Constructor Summary

NullFunction()

Method Summary

void	exec(long addr) This abstract method implements the instruction execution.
void	extractFields(java.math.BigInteger instr) This abstract method is used to copy the field values into local variables where thay are used by the instruction exec() routine.
Field[]	getFormat() This method returns an array of fields describing the instruction format.
int	getSize() This abstract method returns the size of the instruction in bits.
java.lang.String	toString() This method is used to display a string of the Function.

Methods inherited from class java.lang.Object

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

Field Detail

copyright

public static final java.lang.String copyright

Copyright string

See Also:

Constant Field Values

Constructor Detail

NullFunction

public NullFunction()

Method Detail

getFormat

public Field[] getFormat()

Description copied from class: Function

This method returns an array of fields describing the instruction format.

Specified by:

getFormat in class Function

Returns:

this method returns an array of fields describing the instruction format.

getSize

public int getSize()

Description copied from class: Function

This abstract method returns the size of the instruction in bits.

Specified by:

getSize in class Function

Returns:

this abstract method returns the size of the instruction in bits.

extractFields

public void extractFields(java.math.BigInteger instr)

Description copied from class: Function

This abstract method is used to copy the field values into local variables where thay are used by the instruction exec() routine.

Specified by:

extractFields in class Function

Parameters:

instr - the instruction word.

toString

public java.lang.String toString()

Description copied from class: Function

This method is used to display a string of the Function. This should be a list of the fields as displayed in a typical disassembly. This method is used by the disassembler (along with the instruction name) to produce a disassemble string of the instruction.

Specified by:

toString in class Function

exec

public void exec(long addr)
          throws MemoryAccessException,
                 IllegalRegisterException,
                 IllegalOpcodeException

Description copied from class: Function

This abstract method implements the instruction execution.

Specified by:

exec in class Function

Parameters:

addr - the address of this instruction.

Throws:

MemoryAccessException - if an illegal memory access is attempted.

IllegalRegisterException - if an illegal register access is attempted.

IllegalOpcodeException - if an illegal opcode access is attempted.