Package 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.LocalTypeSet>

soot.jimple.toolkits.pointer.CastCheckEliminator

public class CastCheckEliminator
extends ForwardBranchedFlowAnalysis<soot.jimple.toolkits.pointer.LocalTypeSet>

A flow analysis that detects redundant cast checks.

Field Summary

Fields

Modifier and Type	Field	Description
protected soot.jimple.toolkits.pointer.LocalTypeSet	emptySet

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	Description
CastCheckEliminator(BriefUnitGraph cfg)

Method Summary

Modifier and Type	Method	Description
protected void	copy(soot.jimple.toolkits.pointer.LocalTypeSet s, soot.jimple.toolkits.pointer.LocalTypeSet d)	Creates a copy of the source flow object in dest.
protected soot.jimple.toolkits.pointer.LocalTypeSet	entryInitialFlow()	Returns a new, aggressive (local,type) set.
protected void	flowThrough(soot.jimple.toolkits.pointer.LocalTypeSet in, Unit unit, List<soot.jimple.toolkits.pointer.LocalTypeSet> outFallVals, List<soot.jimple.toolkits.pointer.LocalTypeSet> outBranchVals)	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(soot.jimple.toolkits.pointer.LocalTypeSet in1, soot.jimple.toolkits.pointer.LocalTypeSet in2, soot.jimple.toolkits.pointer.LocalTypeSet o)	Compute the merge of the in1 and in2 sets, putting the result into out.
protected soot.jimple.toolkits.pointer.LocalTypeSet	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

Methods inherited from class soot.toolkits.scalar.AbstractFlowAnalysis

getFlowBefore, merge, mergeInto, treatTrapHandlersAsEntries

Methods inherited from class java.lang.Object

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

Field Detail

emptySet

protected soot.jimple.toolkits.pointer.LocalTypeSet emptySet

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 soot.jimple.toolkits.pointer.LocalTypeSet newInitialFlow()

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

Specified by:

newInitialFlow in class AbstractFlowAnalysis<Unit,soot.jimple.toolkits.pointer.LocalTypeSet>

flowThrough

protected void flowThrough(soot.jimple.toolkits.pointer.LocalTypeSet in,
                           Unit unit,
                           List<soot.jimple.toolkits.pointer.LocalTypeSet> outFallVals,
                           List<soot.jimple.toolkits.pointer.LocalTypeSet> outBranchVals)

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

Specified by:

flowThrough in class BranchedFlowAnalysis<Unit,soot.jimple.toolkits.pointer.LocalTypeSet>

copy

protected void copy(soot.jimple.toolkits.pointer.LocalTypeSet s,
                    soot.jimple.toolkits.pointer.LocalTypeSet d)

Description copied from class: AbstractFlowAnalysis

Creates a copy of the source flow object in dest.

Specified by:

copy in class AbstractFlowAnalysis<Unit,soot.jimple.toolkits.pointer.LocalTypeSet>

merge

protected void merge(soot.jimple.toolkits.pointer.LocalTypeSet in1,
                     soot.jimple.toolkits.pointer.LocalTypeSet in2,
                     soot.jimple.toolkits.pointer.LocalTypeSet o)

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<Unit,soot.jimple.toolkits.pointer.LocalTypeSet>

entryInitialFlow

protected soot.jimple.toolkits.pointer.LocalTypeSet entryInitialFlow()

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

Overrides:

entryInitialFlow in class AbstractFlowAnalysis<Unit,soot.jimple.toolkits.pointer.LocalTypeSet>