Package soot.toolkits.scalar

Class SimpleLocalDefs.FlowAssignment

java.lang.Object

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

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

soot.toolkits.scalar.ForwardFlowAnalysis<Unit,soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet>

soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment

All Implemented Interfaces:

LocalDefs

Enclosing class:

SimpleLocalDefs

public class SimpleLocalDefs.FlowAssignment
extends ForwardFlowAnalysis<Unit,soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet>
implements LocalDefs

Nested Class Summary

Nested classes/interfaces inherited from class soot.toolkits.scalar.FlowAnalysis

FlowAnalysis.Flow

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

Constructors

Constructor	Description
FlowAssignment(DirectedGraph<Unit> graph, Local[] locals, List<Unit>[] unitList, int units, boolean omitSSA)

Method Summary

Modifier and Type	Method	Description
protected void	copy(soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet source, soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet dest)	Creates a copy of the source flow object in dest.
protected void	flowThrough(soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet in, Unit unit, soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet out)	Given the merge of the out sets, compute the in set for s (or in to out, depending on direction).
List<Unit>	getDefsOf(Local l)	Returns the definition sites for a Local merged over all points in a method.
List<Unit>	getDefsOfAt(Local l, Unit s)	Returns the definition sites for a Local at a certain point (Unit) in a method.
protected FlowAnalysis.Flow	getFlow(Unit from, Unit to)	You can specify which flow set you would like to use of node from
protected void	merge(soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet in1, soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet in2, soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet out)	Compute the merge of the in1 and in2 sets, putting the result into out.
protected void	mergeInto(Unit succNode, soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet inout, soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet in)	Merges in into inout, just before node succNode.
protected soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet	newInitialFlow()	Returns the flow object corresponding to the initial values for each graph node.
protected boolean	omissible(Unit u)	If a flow node can be omitted return true, otherwise false.

Methods inherited from class soot.toolkits.scalar.ForwardFlowAnalysis

doAnalysis, isForward

Methods inherited from class soot.toolkits.scalar.FlowAnalysis

copyFreshToExisting, getFlowAfter, getFlowBefore

Methods inherited from class soot.toolkits.scalar.AbstractFlowAnalysis

entryInitialFlow, merge, treatTrapHandlersAsEntries

Methods inherited from class java.lang.Object

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

Constructor Detail

FlowAssignment

public FlowAssignment(DirectedGraph<Unit> graph,
                      Local[] locals,
                      List<Unit>[] unitList,
                      int units,
                      boolean omitSSA)

Method Detail

omissible

protected boolean omissible(Unit u)

Description copied from class: FlowAnalysis

If a flow node can be omitted return true, otherwise false. There is no guarantee a node will be omitted. A omissible node does not influence the result of an analysis. If you are unsure, don't overwrite this method

Overrides:

omissible in class FlowAnalysis<Unit,soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet>

Parameters:

u - the node to check

Returns:

false

getFlow

protected FlowAnalysis.Flow getFlow(Unit from,
                                    Unit to)

Description copied from class: FlowAnalysis

You can specify which flow set you would like to use of node from

Overrides:

getFlow in class FlowAnalysis<Unit,soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet>

Returns:

Flow.OUT

flowThrough

protected void flowThrough(soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet in,
                           Unit unit,
                           soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet out)

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<Unit,soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet>

Parameters:

in - the input flow

unit - the current node

out - the returned flow

copy

protected void copy(soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet source,
                    soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet dest)

Description copied from class: AbstractFlowAnalysis

Creates a copy of the source flow object in dest.

Specified by:

copy in class AbstractFlowAnalysis<Unit,soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet>

newInitialFlow

protected soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet 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<Unit,soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet>

mergeInto

protected void mergeInto(Unit succNode,
                         soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet inout,
                         soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet in)

Description copied from class: AbstractFlowAnalysis

Merges in into inout, just before node succNode.

Overrides:

mergeInto in class AbstractFlowAnalysis<Unit,soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet>

merge

protected void merge(soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet in1,
                     soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet in2,
                     soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet 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<Unit,soot.toolkits.scalar.SimpleLocalDefs.FlowAssignment.FlowBitSet>

getDefsOfAt

public List<Unit> getDefsOfAt(Local l,
                              Unit s)

Description copied from interface: LocalDefs

Returns the definition sites for a Local at a certain point (Unit) in a method. You can assume this method never returns null.

Specified by:

getDefsOfAt in interface LocalDefs

Parameters:

l - the Local in question.

s - a unit that specifies the method context (location) to query for the definitions of the Local.

Returns:

a list of Units where the local is defined in the current method context. If there are no uses an empty list will returned.

getDefsOf

public List<Unit> getDefsOf(Local l)

Description copied from interface: LocalDefs

Returns the definition sites for a Local merged over all points in a method. You can assume this method never returns null.

Specified by:

getDefsOf in interface LocalDefs

Parameters:

l - the Local in question.

Returns:

a list of Units where the local is defined in the current method context. If there are no uses an empty list will returned.