soot.jimple.toolkits.scalar.pre
Class NotIsolatedAnalysis

java.lang.Object
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  +--soot.toolkits.scalar.FlowAnalysis
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        +--soot.toolkits.scalar.BackwardFlowAnalysis
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              +--soot.jimple.toolkits.scalar.pre.NotIsolatedAnalysis

public class NotIsolatedAnalysis
extends BackwardFlowAnalysis

Performs a Not-Isolated-analysis on the given graph, which is basicly the same as an Isolated-analysis (we just return the complement, as it's easier to calculate it). A computation is isolated, if it can only be used at the current computation-point. In other words: if the result of the computation will not be used later on the computation is isolated.
The Latest-analysis helps us in finding isolated computations, as they show us points, where a precedent computation can't be used anymore. In completely other words: we search the interval "latest"-"computation". a computation in this interval would not be isolated.


Field Summary
 
Fields inherited from class soot.toolkits.scalar.FlowAnalysis
graph, unitToAfterFlow, unitToBeforeFlow
 
Constructor Summary
NotIsolatedAnalysis(DirectedGraph dg)
          this constructor should not be used, and will throw a runtime-exception!
NotIsolatedAnalysis(DirectedGraph dg, LatestComputation latest, java.util.Map equivRhsMap)
          automaticly performs the Isolation-analysis on the graph dg using the Latest-computation latest.
the equivRhsMap is only here to avoid doing these things again...
NotIsolatedAnalysis(DirectedGraph dg, LatestComputation latest, java.util.Map equivRhsMap, BoundedFlowSet set)
          automaticly performs the Isolation-analysis on the graph dg using the Latest-computation latest.
the equivRhsMap is only here to avoid doing these things again...
the shared set allows more efficient set-operations, when this analysis is joined with other analyses/computations.
 
Method Summary
protected  void copy(java.lang.Object source, java.lang.Object dest)
          Creates a copy of the source flow object in dest.
protected  void flowThrough(java.lang.Object inValue, java.lang.Object unit, java.lang.Object outValue)
          Given the merge of the out sets, compute the in set for s.
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 the flow object corresponding to the initial values for each graph node.
 
Methods inherited from class soot.toolkits.scalar.BackwardFlowAnalysis
doAnalysis, isForward
 
Methods inherited from class soot.toolkits.scalar.FlowAnalysis
customizeInitialFlowGraph, entryInitialFlow, getFlowAfter, getFlowBefore
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

NotIsolatedAnalysis

public NotIsolatedAnalysis(DirectedGraph dg)
this constructor should not be used, and will throw a runtime-exception!


NotIsolatedAnalysis

public NotIsolatedAnalysis(DirectedGraph dg,
                           LatestComputation latest,
                           java.util.Map equivRhsMap)
automaticly performs the Isolation-analysis on the graph dg using the Latest-computation latest.
the equivRhsMap is only here to avoid doing these things again...

Parameters:
dg - a CompleteUnitGraph
latest - the latest-computation of the same graph.
equivRhsMap - the rhs of each unit (if assignment-stmt).

NotIsolatedAnalysis

public NotIsolatedAnalysis(DirectedGraph dg,
                           LatestComputation latest,
                           java.util.Map equivRhsMap,
                           BoundedFlowSet set)
automaticly performs the Isolation-analysis on the graph dg using the Latest-computation latest.
the equivRhsMap is only here to avoid doing these things again...
the shared set allows more efficient set-operations, when this analysis is joined with other analyses/computations.

Parameters:
dg - a CompleteUnitGraph
latest - the latest-computation of the same graph.
equivRhsMap - the rhs of each unit (if assignment-stmt).
set - the shared set.
Method Detail

newInitialFlow

protected java.lang.Object newInitialFlow()
Description copied from class: FlowAnalysis
Returns the flow object corresponding to the initial values for each graph node.

Specified by:
newInitialFlow in class FlowAnalysis

flowThrough

protected void flowThrough(java.lang.Object inValue,
                           java.lang.Object unit,
                           java.lang.Object outValue)
Description copied from class: FlowAnalysis
Given the merge of the out sets, compute the in set for s.

Specified by:
flowThrough in class FlowAnalysis

merge

protected void merge(java.lang.Object in1,
                     java.lang.Object in2,
                     java.lang.Object out)
Description copied from class: FlowAnalysis
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 FlowAnalysis

copy

protected void copy(java.lang.Object source,
                    java.lang.Object dest)
Description copied from class: FlowAnalysis
Creates a copy of the source flow object in dest.

Specified by:
copy in class FlowAnalysis