jeb.api.ast

Class Optimizer

java.lang.Object

jeb.api.ast.Optimizer

public class Optimizer
extends java.lang.Object

This class is an interface to JEB's AST optimization engine.

The JEB decompiler engine applies tens of optimizations on to a method syntax tree before generating the final Java code; this class lets users access some of these optimization methods programmatically.

Since:

1.4.201309040

Constructor Summary

Constructors

Constructor and Description
Optimizer(JebInstance instance, Method m) Create a new optimizer instance.

Method Summary

Modifier and Type	Method and Description
int	removeUnreferencedLabels() This method looks for unreferenced Java labels, and removes them.
int	removeUselessGotos() This method looks for useless goto statements, and removes them.
int	runAllOptimizations() Run all the optimizations that JEB applies to an AST before rendering.

Methods inherited from class java.lang.Object

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

Constructor Detail

Optimizer

public Optimizer(JebInstance instance,
                 Method m)

Create a new optimizer instance. An optimizer is tied to a method and should never be used on other methods than the one used to construct it, at the risk of corrupting syntax trees.

Parameters:

instance - mandatory JEB instance

m - mandatory method

Since:

1.4.201309040

Method Detail

runAllOptimizations

public int runAllOptimizations()

Run all the optimizations that JEB applies to an AST before rendering.

Returns:

the number of optimizations performed

Since:

1.4.201309040

removeUnreferencedLabels

public int removeUnreferencedLabels()

This method looks for unreferenced Java labels, and removes them.

Returns:

the number of optimizations performed, that is, the number of labels removed

Since:

1.4.201309040

removeUselessGotos

public int removeUselessGotos()

This method looks for useless goto statements, and removes them.

AST optimizations often leave an AST with constructs such as goto label; label: ...; This method looks for such constructs, including across blocks, and removes them.

Returns:

the number of optimizations performed, that is, the number of goto statements removed

Since:

1.4.201309040