edu.umd.cs.findbugs.ba.jsr305

Class TypeQualifierDataflowAnalysis

java.lang.Object

edu.umd.cs.findbugs.ba.BasicAbstractDataflowAnalysis<Fact>

edu.umd.cs.findbugs.ba.AbstractDataflowAnalysis<TypeQualifierValueSet>

edu.umd.cs.findbugs.ba.jsr305.TypeQualifierDataflowAnalysis

All Implemented Interfaces:

DataflowAnalysis<TypeQualifierValueSet>

Direct Known Subclasses:

BackwardTypeQualifierDataflowAnalysis, ForwardTypeQualifierDataflowAnalysis

public abstract class TypeQualifierDataflowAnalysis
extends AbstractDataflowAnalysis<TypeQualifierValueSet>

Abstract base class for type qualifier dataflow analyses.

Author:

David Hovemeyer

Field Summary

Fields

Modifier and Type	Field and Description
protected CFG	cfg
protected org.apache.bcel.generic.ConstantPoolGen	cpg
protected TypeQualifierValue<?>	typeQualifierValue
protected ValueNumberDataflow	vnaDataflow
protected XMethod	xmethod

Constructor Summary

Constructors

Constructor and Description
TypeQualifierDataflowAnalysis(XMethod xmethod, CFG cfg, ValueNumberDataflow vnaDataflow, org.apache.bcel.generic.ConstantPoolGen cpg, TypeQualifierValue<?> typeQualifierValue) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
void	copy(TypeQualifierValueSet source, TypeQualifierValueSet dest) Copy dataflow facts.
TypeQualifierValueSet	createFact() Create empty (uninitialized) dataflow facts for one program point.
void	edgeTransfer(Edge edge, TypeQualifierValueSet fact) Edge transfer function.
java.util.Set<SourceSinkInfo>	getSourceSinkInfoSet(Location location) Get the set of SourceSinkInfo objects representing sources/sinks at a given Location.
void	initEntryFact(TypeQualifierValueSet result) Initialize the "entry" fact for the graph.
boolean	isFactValid(TypeQualifierValueSet fact) Determine whether the given fact is valid (neither top nor bottom).
boolean	isTop(TypeQualifierValueSet fact) Is the given fact the top value.
void	makeFactTop(TypeQualifierValueSet fact) Make given fact the top value.
void	meetInto(TypeQualifierValueSet fact, Edge edge, TypeQualifierValueSet result) Meet a dataflow fact associated with an incoming edge into another fact.
protected abstract void	propagateAcrossPhiNode(TypeQualifierValueSet fact, ValueNumber sourceVN, ValueNumber targetVN)
protected void	registerSourceSink(SourceSinkInfo sourceSinkInfo)
abstract void	registerSourceSinkLocations() This method must be called before the dataflow analysis is executed.
boolean	same(TypeQualifierValueSet fact1, TypeQualifierValueSet fact2) Are given dataflow facts the same?
void	transferInstruction(org.apache.bcel.generic.InstructionHandle handle, BasicBlock basicBlock, TypeQualifierValueSet fact) Transfer function for a single instruction.

Methods inherited from class edu.umd.cs.findbugs.ba.AbstractDataflowAnalysis

getFactAfterLocation, getFactAtLocation, transfer

Methods inherited from class edu.umd.cs.findbugs.ba.BasicAbstractDataflowAnalysis

factToString, finishIteration, getFactOnEdge, getLastUpdateTimestamp, getResultFact, getStartFact, resultFactIterator, setLastUpdateTimestamp, startIteration

Methods inherited from class java.lang.Object

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

Methods inherited from interface edu.umd.cs.findbugs.ba.DataflowAnalysis

getBlockOrder, isForwards

Field Detail

xmethod

protected final XMethod xmethod

cfg

protected final CFG cfg

vnaDataflow

protected final ValueNumberDataflow vnaDataflow

typeQualifierValue

protected final TypeQualifierValue<?> typeQualifierValue

cpg

protected final org.apache.bcel.generic.ConstantPoolGen cpg

Constructor Detail

TypeQualifierDataflowAnalysis

public TypeQualifierDataflowAnalysis(XMethod xmethod,
                             CFG cfg,
                             ValueNumberDataflow vnaDataflow,
                             org.apache.bcel.generic.ConstantPoolGen cpg,
                             TypeQualifierValue<?> typeQualifierValue)

Constructor.

Parameters:

xmethod - XMethod object containing information about the method being analyzed

cfg - the control-flow graph (CFG) of the method being analyzed

vnaDataflow - ValueNumberDataflow for the method

cpg - the constant pool being built up

typeQualifierValue - the TypeQualifierValue we want the dataflow analysis to check

Method Detail

initEntryFact

public void initEntryFact(TypeQualifierValueSet result)
                   throws DataflowAnalysisException

Description copied from interface: DataflowAnalysis

Initialize the "entry" fact for the graph.

Throws:

DataflowAnalysisException

isFactValid

public boolean isFactValid(TypeQualifierValueSet fact)

Description copied from class: AbstractDataflowAnalysis

Determine whether the given fact is valid (neither top nor bottom).

Specified by:

isFactValid in class AbstractDataflowAnalysis<TypeQualifierValueSet>

copy

public void copy(TypeQualifierValueSet source,
        TypeQualifierValueSet dest)

Description copied from interface: DataflowAnalysis

Copy dataflow facts.

createFact

public TypeQualifierValueSet createFact()

Description copied from interface: DataflowAnalysis

Create empty (uninitialized) dataflow facts for one program point. A valid value will be copied into it before it is used.

isTop

public boolean isTop(TypeQualifierValueSet fact)

Description copied from interface: DataflowAnalysis

Is the given fact the top value.

makeFactTop

public void makeFactTop(TypeQualifierValueSet fact)

Description copied from interface: DataflowAnalysis

Make given fact the top value.

meetInto

public void meetInto(TypeQualifierValueSet fact,
            Edge edge,
            TypeQualifierValueSet result)
              throws DataflowAnalysisException

Description copied from interface: DataflowAnalysis

Meet a dataflow fact associated with an incoming edge into another fact. This is used to determine the start fact for a basic block.

Parameters:

fact - the predecessor fact (incoming edge)

edge - the edge from the predecessor

result - the result fact

Throws:

DataflowAnalysisException

same

public boolean same(TypeQualifierValueSet fact1,
           TypeQualifierValueSet fact2)

Description copied from interface: DataflowAnalysis

Are given dataflow facts the same?

edgeTransfer

public void edgeTransfer(Edge edge,
                TypeQualifierValueSet fact)
                  throws DataflowAnalysisException

Description copied from interface: DataflowAnalysis

Edge transfer function. Modify the given fact that is true on the (logical) edge source to modify it so that it is true at the (logical) edge target.

A do-nothing implementation is legal, and appropriate for analyses where branches are not significant.

Specified by:

edgeTransfer in interface DataflowAnalysis<TypeQualifierValueSet>

Overrides:

edgeTransfer in class BasicAbstractDataflowAnalysis<TypeQualifierValueSet>

Parameters:

edge - the Edge

fact - a dataflow fact

Throws:

DataflowAnalysisException

propagateAcrossPhiNode

protected abstract void propagateAcrossPhiNode(TypeQualifierValueSet fact,
                          ValueNumber sourceVN,
                          ValueNumber targetVN)

registerSourceSinkLocations

public abstract void registerSourceSinkLocations()
                                          throws DataflowAnalysisException

This method must be called before the dataflow analysis is executed.

Throws:

DataflowAnalysisException

registerSourceSink

protected void registerSourceSink(SourceSinkInfo sourceSinkInfo)

getSourceSinkInfoSet

public java.util.Set<SourceSinkInfo> getSourceSinkInfoSet(Location location)

Get the set of SourceSinkInfo objects representing sources/sinks at a given Location.

Parameters:

location - a Location

Returns:

Set of SourceSinkInfo objects representing sources/sinks at the Location

transferInstruction

public void transferInstruction(org.apache.bcel.generic.InstructionHandle handle,
                       BasicBlock basicBlock,
                       TypeQualifierValueSet fact)
                         throws DataflowAnalysisException

Description copied from class: AbstractDataflowAnalysis

Transfer function for a single instruction.

Specified by:

transferInstruction in class AbstractDataflowAnalysis<TypeQualifierValueSet>

Parameters:

handle - the instruction

basicBlock - the BasicBlock containing the instruction; needed to disambiguate instructions in inlined JSR subroutines

fact - which should be modified based on the instruction

Throws:

DataflowAnalysisException