Package edu.umd.cs.findbugs.ba.npe

Interface NullDerefAndRedundantComparisonCollector

All Known Implementing Classes:

FindNullDeref, NoiseNullDeref

public interface NullDerefAndRedundantComparisonCollector

Callback interface for collecting null pointer derefs and redundant null comparisons.

Author:

David Hovemeyer

See Also:

• NullDerefAndRedundantComparisonFinder

Method Summary

Modifier and Type	Method	Description
void	foundGuaranteedNullDeref(Set<Location> assignedNullLocationSet, Set<Location> derefLocationSet, SortedSet<Location> doomedLocations, ValueNumberDataflow vna, ValueNumber refValue, BugAnnotation variableAnnotation, NullValueUnconditionalDeref deref, boolean npeIfStatementCovered)	Subclasses should override this method to capture values assigned null (or that become null through a comparison and branch) that are guaranteed to reach a dereference (ignoring implicit exception paths).
void	foundNullDeref(Location location, ValueNumber valueNumber, IsNullValue refValue, ValueNumberFrame vnaFrame)	Deprecated. Use foundNullDeref(Location,ValueNumber,IsNullValue,ValueNumberFrame,boolean) instead
void	foundNullDeref(Location location, ValueNumber valueNumber, IsNullValue refValue, ValueNumberFrame vnaFrame, boolean isConsistent)	Subclasses should override this method to capture locations where a null pointer is dereferenced.
void	foundRedundantNullCheck(Location location, RedundantBranch redundantBranch)	Subclasses should override this method to capture locations where a redundant null comparison is performed.

Method Details

foundNullDeref

@Deprecated
void foundNullDeref(Location location,
 ValueNumber valueNumber,
 IsNullValue refValue,
 ValueNumberFrame vnaFrame)

Deprecated.

Use foundNullDeref(Location,ValueNumber,IsNullValue,ValueNumberFrame,boolean) instead

Subclasses should override this method to capture locations where a null pointer is dereferenced.

Parameters:

location - the Location of the null dereference

valueNumber - the ValueNumber of the possibly-null value

refValue - the kind of possibly-null value dereferenced

vnaFrame - The ValueNumber Frame at the point where the dereference occurred

foundNullDeref

void foundNullDeref(Location location,
 ValueNumber valueNumber,
 IsNullValue refValue,
 ValueNumberFrame vnaFrame,
 boolean isConsistent)

Subclasses should override this method to capture locations where a null pointer is dereferenced.

Parameters:

location - the Location of the null dereference

valueNumber - the ValueNumber of the possibly-null value

refValue - the kind of possibly-null value dereferenced

vnaFrame - The ValueNumber Frame at the point where the dereference occurred

isConsistent - true if the refValue is identical at all clones of the same instruction

foundRedundantNullCheck

void foundRedundantNullCheck(Location location,
 RedundantBranch redundantBranch)

Subclasses should override this method to capture locations where a redundant null comparison is performed.

Parameters:

location - the Location of the redundant null check

redundantBranch - the RedundantBranch

foundGuaranteedNullDeref

void foundGuaranteedNullDeref(@Nonnull
 Set<Location> assignedNullLocationSet,
 @Nonnull
 Set<Location> derefLocationSet,
 SortedSet<Location> doomedLocations,
 ValueNumberDataflow vna,
 ValueNumber refValue,
 @CheckForNull
 BugAnnotation variableAnnotation,
 NullValueUnconditionalDeref deref,
 boolean npeIfStatementCovered)

Subclasses should override this method to capture values assigned null (or that become null through a comparison and branch) that are guaranteed to reach a dereference (ignoring implicit exception paths).

Parameters:

assignedNullLocationSet - set of locations where the value becomes null

derefLocationSet - set of locations where dereferences occur

doomedLocations - locations at which the value is doomed

vna - ValueNumberDataflow

refValue - the null value

variableAnnotation - TODO

deref - TODO

npeIfStatementCovered - true if doom location is a statement