soot.jimple.toolkits.scalar
Class EqualLocalsAnalysis

java.lang.Object
  extended by soot.toolkits.scalar.AbstractFlowAnalysis<N,A>
      extended by soot.toolkits.scalar.FlowAnalysis<N,A>
          extended by soot.toolkits.scalar.ForwardFlowAnalysis
              extended by soot.jimple.toolkits.scalar.EqualLocalsAnalysis

public class EqualLocalsAnalysis
extends ForwardFlowAnalysis


Field Summary
 
Fields inherited from class soot.toolkits.scalar.FlowAnalysis
filterUnitToAfterFlow, unitToAfterFlow
 
Fields inherited from class soot.toolkits.scalar.AbstractFlowAnalysis
filterUnitToBeforeFlow, graph, unitToBeforeFlow
 
Constructor Summary
EqualLocalsAnalysis(UnitGraph g)
           
 
Method Summary
protected  void copy(Object source, Object dest)
          Creates a copy of the source flow object in dest.
protected  Object entryInitialFlow()
          Returns the initial flow value for entry/exit graph nodes.
protected  void flowThrough(Object inValue, Object unit, Object outValue)
          Given the merge of the out sets, compute the in set for s (or in to out, depending on direction).
 List getCopiesOfAt(Local l, Stmt s)
          Returns a list of EquivalentValue wrapped Locals and Refs that must always be equal to l at s
protected  void merge(Object in1, Object in2, Object out)
          Compute the merge of the in1 and in2 sets, putting the result into out.
protected  Object newInitialFlow()
          Returns the flow object corresponding to the initial values for each graph node.
 
Methods inherited from class soot.toolkits.scalar.ForwardFlowAnalysis
constructWorklist, doAnalysis, isForward
 
Methods inherited from class soot.toolkits.scalar.FlowAnalysis
constructOrderer, getFlowAfter
 
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
 

Constructor Detail

EqualLocalsAnalysis

public EqualLocalsAnalysis(UnitGraph g)
Method Detail

getCopiesOfAt

public List getCopiesOfAt(Local l,
                          Stmt s)
Returns a list of EquivalentValue wrapped Locals and Refs that must always be equal to l at s


merge

protected void merge(Object in1,
                     Object in2,
                     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

flowThrough

protected void flowThrough(Object inValue,
                           Object unit,
                           Object outValue)
Description copied from class: FlowAnalysis
Given the merge of the out sets, compute the in set for s (or in to out, depending on direction). This function often causes confusion, because the same interface is used for both forward and backward flow analyses. The first parameter is always the argument to the flow function (i.e. it is the "in" set in a forward analysis and the "out" set in a backward analysis), and the third parameter is always the result of the flow function (i.e. it is the "out" set in a forward analysis and the "in" set in a backward analysis).

Specified by:
flowThrough in class FlowAnalysis

copy

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

Specified by:
copy in class AbstractFlowAnalysis

entryInitialFlow

protected Object entryInitialFlow()
Description copied from class: AbstractFlowAnalysis
Returns the initial flow value for entry/exit graph nodes.

Specified by:
entryInitialFlow in class AbstractFlowAnalysis

newInitialFlow

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

Specified by:
newInitialFlow in class AbstractFlowAnalysis