Class EDU.gac.max.MC97.S97.compiler_support.RegisterAllocator

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Class EDU.gac.max.MC97.S97.compiler_support.RegisterAllocator

java.lang.Object
   |
   +----EDU.gac.max.MC97.S97.compiler_support.RegisterAllocator

public class RegisterAllocator
extends Object

The Register class is used to represent a pool from which Registers can be allocated and to which they can then later be deallocated. Some to-do items:

signal a better exception than array out of bounds for out of registers
signal an exception for deallocating an already free register
provide enumerations of free and allocated registers

Written 7 Feb 1997 by Max Hailperin <max@gac.edu>

RegisterAllocator(String, int): The RegisterAllocator constructor takes a String prefix argument that is used for constructing each Register.

allocate()
deallocate(Register)
deallocateIfYours(Register)

RegisterAllocator

  public RegisterAllocator(String prefix,
                           int number)

The RegisterAllocator constructor takes a String prefix argument that is used for constructing each Register. It also takes an int number argument, which specifies how many registers there will be. They are numbered consectively from 0. For example, new RegisterAllocator("t", 10) will allocate registers $t0 through $t9.

allocate

  public Register allocate()

deallocate

  public void deallocate(Register r) throws NotMyRegisterException

deallocateIfYours

  public void deallocateIfYours(Register r)

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