edu.umd.cs.findbugs.ba.vna

Class ValueNumberFrame

java.lang.Object

edu.umd.cs.findbugs.ba.Frame<ValueNumber>

edu.umd.cs.findbugs.ba.vna.ValueNumberFrame

All Implemented Interfaces:

ValueNumberAnalysisFeatures

public class ValueNumberFrame
extends Frame<ValueNumber>
implements ValueNumberAnalysisFeatures

A dataflow value representing a Java stack frame with value number information.

Author:

David Hovemeyer

See Also:

ValueNumber, ValueNumberAnalysis

Field Summary

Fields

Modifier and Type	Field and Description
boolean	phiNodeForLoads

Fields inherited from interface edu.umd.cs.findbugs.ba.vna.ValueNumberAnalysisFeatures

REDUNDANT_LOAD_ELIMINATION, RLE_DEBUG

Constructor Summary

Constructors

Constructor and Description
ValueNumberFrame(int numLocals)

Method Summary

Methods

Modifier and Type	Method and Description
void	addAvailableLoad(AvailableLoad availableLoad, ValueNumber[] value) Add an available load.
String	availableLoadMapAsString()
void	copyFrom(Frame<ValueNumber> other) Make this Frame exactly the same as the one given as a parameter.
boolean	fromMatchingFields(ValueNumber v1, ValueNumber v2)
boolean	fromMatchingLoads(ValueNumber v1, ValueNumber v2)
boolean	fuzzyMatch(ValueNumber v1, ValueNumber v2)
ValueNumber[]	getAvailableLoad(AvailableLoad availableLoad) Look for an available load.
AvailableLoad	getLoad(ValueNumber v)
boolean	hasAvailableLoads()
boolean	haveMatchingFlags(ValueNumber v1, ValueNumber v2)
void	killAllLoads() Kill all loads.
void	killAllLoads(boolean primitiveOnly)
void	killAllLoadsExceptFor(ValueNumber v)
void	killAllLoadsOf(ValueNumber v) Kill all loads.
void	killLoadsOf(Set<XField> fieldsToKill)
void	killLoadsOfField(XField field) Kill all loads of given field.
void	killLoadsWithSimilarName(String className, String methodName)
boolean	sameAs(Frame<ValueNumber> other) Return true if this stack frame is the same as the one given as a parameter.
String	toString() Convert to string.
Collection<ValueNumber>	valueNumbersForLoads()
boolean	veryFuzzyMatch(ValueNumber v1, ValueNumber v2)

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

allSlots, clearStack, contains, getArgument, getArgument, getArgumentSet, getArgumentSlot, getInstance, getInstanceSlot, getInstanceStackLocation, getLastUpdateTimestamp, getNumArguments, getNumArgumentsIncludingObjectInstance, getNumLocals, getNumSlots, getOperand, getStackDepth, getStackLocation, getStackValue, getTopStackWords, getTopValue, getValue, isBottom, isTop, isValid, popValue, pushValue, setBottom, setLastUpdateTimestamp, setTop, setValid, setValue, valueToString

Methods inherited from class java.lang.Object

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

Field Detail

phiNodeForLoads

public boolean phiNodeForLoads

Constructor Detail

ValueNumberFrame

public ValueNumberFrame(int numLocals)

Method Detail

availableLoadMapAsString

public String availableLoadMapAsString()

getLoad

@CheckForNull
public AvailableLoad getLoad(ValueNumber v)

getAvailableLoad

public ValueNumber[] getAvailableLoad(AvailableLoad availableLoad)

Look for an available load.

Parameters:

availableLoad - the AvailableLoad (reference and field)

Returns:

the value(s) available, or null if no matching entry is found

addAvailableLoad

public void addAvailableLoad(AvailableLoad availableLoad,
                    @Nonnull
                    ValueNumber[] value)

Add an available load.

Parameters:

availableLoad - the AvailableLoad (reference and field)

value - the value(s) loaded

killLoadsOfField

public void killLoadsOfField(XField field)

Kill all loads of given field.

Parameters:

field - the field

killAllLoads

public void killAllLoads()

Kill all loads. This conservatively handles method calls where we don't really know what fields might be assigned.

killAllLoads

public void killAllLoads(boolean primitiveOnly)

killAllLoadsExceptFor

public void killAllLoadsExceptFor(@CheckForNull
                         ValueNumber v)

killAllLoadsOf

public void killAllLoadsOf(@CheckForNull
                  ValueNumber v)

Kill all loads. This conservatively handles method calls where we don't really know what fields might be assigned.

killLoadsOf

public void killLoadsOf(Set<XField> fieldsToKill)

killLoadsWithSimilarName

public void killLoadsWithSimilarName(String className,
                            String methodName)

copyFrom

public void copyFrom(Frame<ValueNumber> other)

Description copied from class: Frame

Make this Frame exactly the same as the one given as a parameter.

Overrides:

copyFrom in class Frame<ValueNumber>

Parameters:

other - the Frame to make this object the same as

toString

public String toString()

Description copied from class: Frame

Convert to string.

Overrides:

toString in class Frame<ValueNumber>

fuzzyMatch

public boolean fuzzyMatch(ValueNumber v1,
                 ValueNumber v2)

veryFuzzyMatch

public boolean veryFuzzyMatch(ValueNumber v1,
                     ValueNumber v2)

fromMatchingLoads

public boolean fromMatchingLoads(ValueNumber v1,
                        ValueNumber v2)

fromMatchingFields

public boolean fromMatchingFields(ValueNumber v1,
                         ValueNumber v2)

haveMatchingFlags

public boolean haveMatchingFlags(ValueNumber v1,
                        ValueNumber v2)

Returns:

true if v1 and v2 have a flag in common

valueNumbersForLoads

public Collection<ValueNumber> valueNumbersForLoads()

sameAs

public boolean sameAs(Frame<ValueNumber> other)

Description copied from class: Frame

Return true if this stack frame is the same as the one given as a parameter.

Overrides:

sameAs in class Frame<ValueNumber>

Parameters:

other - the other Frame

Returns:

true if the frames are the same, false otherwise

hasAvailableLoads

public boolean hasAvailableLoads()