scale.backend
Class DiffDisplacement

java.lang.Object
  scale.backend.Displacement
      scale.backend.DiffDisplacement

public class DiffDisplacement
extends Displacement

This class represents a displacement field in an instruction that is the difference between two displacements.

$Id: DiffDisplacement.java,v 1.19 2007-09-20 18:57:39 burrill Exp $

Copyright 2007 by the Scale Compiler Group,
Department of Computer Science
University of Massachusetts,
Amherst MA. 01003, USA
All Rights Reserved.

Constructor Summary

DiffDisplacement(Displacement lDisplacement, Displacement rDisplacement)
Obtain a Displacement which is a difference between two other Displacements.

Method Summary

java.lang.String	assembler(Assembler asm) Generate a String representation that can be used by the assembly code generater.
boolean	equivalent(java.lang.Object o) Return true if the displacements are equivalent.
long	getDisplacement() Return the displacement.
boolean	isNumeric() Return true if the displacement can be represented as a number.
boolean	isStack() Return true if the displacement is from the stack pointer.
boolean	isZero() Return true if the displacement is zero.
java.lang.String	toString()
Displacement	unique() Return a unique displacement.

Methods inherited from class scale.backend.Displacement

adjust, created, getBase, isSymbol, offset

Methods inherited from class java.lang.Object

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

Constructor Detail

DiffDisplacement

public DiffDisplacement(Displacement lDisplacement,
                        Displacement rDisplacement)

Obtain a Displacement which is a difference between two other Displacements.

Method Detail

unique

public Displacement unique()

Return a unique displacement. For the Alpha, each symbol reference must have a unique identification number.

Specified by:

unique in class Displacement

See Also:

SymbolDisplacement

isZero

public boolean isZero()

Return true if the displacement is zero.

Overrides:

isZero in class Displacement

isNumeric

public boolean isNumeric()

Return true if the displacement can be represented as a number.

Overrides:

isNumeric in class Displacement

getDisplacement

public long getDisplacement()

Return the displacement.

Overrides:

getDisplacement in class Displacement

isStack

public boolean isStack()

Return true if the displacement is from the stack pointer.

Overrides:

isStack in class Displacement

assembler

public java.lang.String assembler(Assembler asm)

Generate a String representation that can be used by the assembly code generater.

Specified by:

assembler in class Displacement

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

equivalent

public boolean equivalent(java.lang.Object o)

Return true if the displacements are equivalent.

Overrides:

equivalent in class Displacement