geneseo.cs.miniml
Class SparcRegisterTable

java.lang.Object
  |
  +--geneseo.cs.miniml.SparcRegisterTable

All Implemented Interfaces:

RegisterTable

public class SparcRegisterTable

extends java.lang.Object

implements RegisterTable

Represents tables that track the availability of "in" and "local" registers for a SPARC compiler.

Constructor Summary

SparcRegisterTable()
Initializes a SPARC register table so that all registers are free.

Method Summary

void	clear() Marks all registers as unused.
java.lang.String	findFree() Find a free register.
boolean	isFree(java.lang.String regName) Inquire whether a register is free.
void	markFree(java.lang.String regName) Marks a register as free.
void	markUsed(java.lang.String regName) Marks a register as used.

Methods inherited from class java.lang.Object

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

Constructor Detail

SparcRegisterTable

public SparcRegisterTable()

Initializes a SPARC register table so that all registers are free.

Method Detail

clear

public void clear()

Description copied from interface: RegisterTable

Marks all registers as unused.

Specified by:

clear in interface RegisterTable

markUsed

public void markUsed(java.lang.String regName)

Description copied from interface: RegisterTable

Marks a register as used.

Specified by:

markUsed in interface RegisterTable

Following copied from interface: geneseo.cs.compiler.RegisterTable

Parameters:

regName - the name of the register to mark used.

markFree

public void markFree(java.lang.String regName)

Description copied from interface: RegisterTable

Marks a register as free.

Specified by:

markFree in interface RegisterTable

Following copied from interface: geneseo.cs.compiler.RegisterTable

Parameters:

regName - the name of the register to make free.

isFree

public boolean isFree(java.lang.String regName)

Description copied from interface: RegisterTable

Inquire whether a register is free.

Specified by:

isFree in interface RegisterTable

Following copied from interface: geneseo.cs.compiler.RegisterTable

Parameters:

regName - the name of the register.

Returns:

True if the register is free, false if it isn't or if no such register exists.

findFree

public java.lang.String findFree()
                          throws CompilerException

Description copied from interface: RegisterTable

Find a free register.

Specified by:

findFree in interface RegisterTable

Following copied from interface: geneseo.cs.compiler.RegisterTable

Returns:

a string naming a free register.

Throws:

CompilerException - if no registers are free.