org.multijava.util.backend
Class Optimizer

java.lang.Object
  org.multijava.util.backend.Optimizer

All Implemented Interfaces:

AccessorContainer

public class Optimizer

extends Object

implements AccessorContainer

This class is the entry point for the peephole byte code optimizer

Field Summary
private  InstructionHandle	codeStart
private  HandlerInfo[]	handlers
private  LocalVariableInfo[]	localVariables

 

Constructor Summary

Optimizer(CodeInfo codeInfo)           Constructs a new optimizer object.

 

Method Summary
private  void	buildBasicBlocks(InstructionHandle start)
private  Instruction[]	buildInstructionArray()           Build the array of the instructions resulting from the optimization process.
private  LineNumberInfo[]	buildLineNumberInfo()           Build the array of line number information for the optimized instruction sequence.
private  void	cleanCode(InstructionHandle start)
private  void	dumpCode(Instruction[] insns)
CodeInfo	getCodeInfo()           Returns a new, optimized code info structure.
InstructionHandle	getCodeStart()
private  InstructionHandle	installInstructionHandles(CodeInfo info)           Install handles around instructions.
static CodeInfo	optimize(MethodInfo info, CodeInfo code, BackendOptions options)           Optimizes the byte code for a single method.
void	setCodeStart(InstructionHandle handle)
void	transformAccessors(AccessorTransformer transformer)           Transforms targets (deferences to actual instructions).

 

Methods inherited from class java.lang.Object

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

 

Field Detail

codeStart

private InstructionHandle codeStart

handlers

private HandlerInfo[] handlers

localVariables

private LocalVariableInfo[] localVariables

Optimizer

public Optimizer(CodeInfo codeInfo)

Constructs a new optimizer object.

optimize

public static CodeInfo optimize(MethodInfo info,
                                CodeInfo code,
                                BackendOptions options)

Optimizes the byte code for a single method.

getCodeInfo

public CodeInfo getCodeInfo()

Returns a new, optimized code info structure.

buildBasicBlocks

private void buildBasicBlocks(InstructionHandle start)

cleanCode

private void cleanCode(InstructionHandle start)

installInstructionHandles

private InstructionHandle installInstructionHandles(CodeInfo info)

Install handles around instructions.

dumpCode

private void dumpCode(Instruction[] insns)

buildInstructionArray

private Instruction[] buildInstructionArray()

Build the array of the instructions resulting from the optimization process.

Returns:

the array of instructions

buildLineNumberInfo

private LineNumberInfo[] buildLineNumberInfo()

Build the array of line number information for the optimized instruction sequence.

transformAccessors

public void transformAccessors(AccessorTransformer transformer)
                        throws BadAccessorException

Transforms targets (deferences to actual instructions).

Specified by:

transformAccessors in interface AccessorContainer

Parameters:

transformer - the transformer used to transform accessors

Throws:

BadAccessorException

setCodeStart

public void setCodeStart(InstructionHandle handle)

getCodeStart

public InstructionHandle getCodeStart()