comp
Class RegBank

java.lang.Object
  |
  +--comp.RegBank

public class RegBank

extends java.lang.Object

Manages a set of registers for use during code generation.

Version:

$Id: RegBank.java,v 1.4 2002/05/10 22:49:25 dugan Exp $

Field Summary

(package private) int	liveCount
(package private) boolean[]	regs

Constructor Summary

RegBank(int numRegs)

Method Summary

void	free(java.lang.String reg) Return this register to the bank.
void	freeAll() Free all registers currenly in use.
java.lang.String	newReg() Answer a new register name as a String.
void	restoreRegs(Assembler asm, java.util.List saved) Restore all the registers in the given list.
java.util.List	saveRegs(Assembler asm) Save all registers currently on use.

Methods inherited from class java.lang.Object

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

Field Detail

regs

boolean[] regs

liveCount

int liveCount

Constructor Detail

RegBank

public RegBank(int numRegs)

Method Detail

free

public void free(java.lang.String reg)

Return this register to the bank.

newReg

public java.lang.String newReg()

Answer a new register name as a String.

freeAll

public void freeAll()

Free all registers currenly in use.

saveRegs

public java.util.List saveRegs(Assembler asm)

Save all registers currently on use. The stack is grown by the correct number of bytes, and the registers are stored onto it.

Returns:

a List of saved registers.

restoreRegs

public void restoreRegs(Assembler asm,
                        java.util.List saved)

Restore all the registers in the given list. The stack is shrunk by the correct amount, and each register in the list is restored.