soot.jimple.toolkits.pointer

Class CastCheckEliminator

java.lang.Object

soot.toolkits.scalar.AbstractFlowAnalysis<N,A>

soot.toolkits.scalar.BranchedFlowAnalysis<Unit,A>

soot.toolkits.scalar.ForwardBranchedFlowAnalysis

soot.jimple.toolkits.pointer.CastCheckEliminator

public class CastCheckEliminator
extends ForwardBranchedFlowAnalysis

A flow analysis that detects redundant cast checks.

Field Summary

Fields inherited from class soot.toolkits.scalar.BranchedFlowAnalysis

unitToAfterBranchFlow, unitToAfterFallFlow

Fields inherited from class soot.toolkits.scalar.AbstractFlowAnalysis

filterUnitToBeforeFlow, graph, unitToBeforeFlow

Constructor Summary

Constructors

Constructor and Description
CastCheckEliminator(BriefUnitGraph cfg)

Method Summary

Modifier and Type	Method and Description
protected void	copy(java.lang.Object source, java.lang.Object dest) Creates a copy of the source flow object in dest.
protected java.lang.Object	entryInitialFlow() Returns a new, aggressive (local,type) set.
protected void	flowThrough(java.lang.Object inValue, Unit unit, java.util.List outFallValues, java.util.List outBranchValues) This is the flow function as described in the assignment write-up.
protected void	makeInitialSet() Find all the locals of reference type and all the types used in casts to initialize the mapping from locals and types to bits in the bit vector in LocalTypeSet.
protected void	merge(java.lang.Object in1, java.lang.Object in2, java.lang.Object out) Compute the merge of the in1 and in2 sets, putting the result into out.
protected java.lang.Object	newInitialFlow() Returns a new, aggressive (local,type) set.
protected void	tagCasts() Put the results of the analysis into tags in cast statements.

Methods inherited from class soot.toolkits.scalar.ForwardBranchedFlowAnalysis

doAnalysis, isForward

Methods inherited from class soot.toolkits.scalar.BranchedFlowAnalysis

getBranchFlowAfter, getFallFlowAfter, getFlowBefore

Methods inherited from class soot.toolkits.scalar.AbstractFlowAnalysis

merge, mergeInto, treatTrapHandlersAsEntries

Methods inherited from class java.lang.Object

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

Constructor Detail

CastCheckEliminator

public CastCheckEliminator(BriefUnitGraph cfg)

Method Detail

tagCasts

protected void tagCasts()

Put the results of the analysis into tags in cast statements.

makeInitialSet

protected void makeInitialSet()

Find all the locals of reference type and all the types used in casts to initialize the mapping from locals and types to bits in the bit vector in LocalTypeSet.

newInitialFlow

protected java.lang.Object newInitialFlow()

Returns a new, aggressive (local,type) set.

Specified by:

newInitialFlow in class AbstractFlowAnalysis

flowThrough

protected void flowThrough(java.lang.Object inValue,
                           Unit unit,
                           java.util.List outFallValues,
                           java.util.List outBranchValues)

This is the flow function as described in the assignment write-up.

Specified by:

flowThrough in class BranchedFlowAnalysis

copy

protected void copy(java.lang.Object source,
                    java.lang.Object dest)

Description copied from class: AbstractFlowAnalysis

Creates a copy of the source flow object in dest.

Specified by:

copy in class AbstractFlowAnalysis

merge

protected void merge(java.lang.Object in1,
                     java.lang.Object in2,
                     java.lang.Object out)

Description copied from class: AbstractFlowAnalysis

Compute the merge of the in1 and in2 sets, putting the result into out. The behavior of this function depends on the implementation ( it may be necessary to check whether in1 and in2 are equal or aliased ). Used by the doAnalysis method.

Specified by:

merge in class AbstractFlowAnalysis

entryInitialFlow

protected java.lang.Object entryInitialFlow()

Returns a new, aggressive (local,type) set.

Specified by:

entryInitialFlow in class AbstractFlowAnalysis