org.jikesrvm.compilers.opt.regalloc

Class GenericStackManager.ScratchRegister

java.lang.Object

org.jikesrvm.compilers.opt.regalloc.GenericStackManager.ScratchRegister

Enclosing class:

GenericStackManager

protected static final class GenericStackManager.ScratchRegister
extends Object

Class to represent a physical register currently allocated as a scratch register. A scratch register is a register that is reserved for use in spills and unspills. It is not available as a normal register for the register allocation.

Field Summary

Fields

Modifier and Type	Field and Description
Register	currentContents The current contents of scratch
private boolean	dirty Is this physical register currently dirty?
Register	scratch The physical register used as scratch.
private boolean	spilledIt Did we spill a value in order to free up this scratch register?

Constructor Summary

Constructors

Constructor and Description
ScratchRegister(Register scratch, Register currentContents)

Method Summary

Modifier and Type	Method and Description
boolean	hadToSpill()
boolean	isDirty()
void	setDirty(boolean b)
void	setHadToSpill(boolean b)
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

scratch

public final Register scratch

The physical register used as scratch.

currentContents

public Register currentContents

The current contents of scratch

dirty

private boolean dirty

Is this physical register currently dirty? (Must be written back to memory?)

spilledIt

private boolean spilledIt

Did we spill a value in order to free up this scratch register?

Constructor Detail

ScratchRegister

public ScratchRegister(Register scratch,
                       Register currentContents)

Method Detail

isDirty

public boolean isDirty()

setDirty

public void setDirty(boolean b)

hadToSpill

public boolean hadToSpill()

setHadToSpill

public void setHadToSpill(boolean b)

toString

public String toString()

Overrides:

toString in class Object