Package org.checkerframework.checker.nullness

Class NullnessStore

java.lang.Object

org.checkerframework.framework.flow.CFAbstractStore<NullnessValue,NullnessStore>

org.checkerframework.checker.initialization.InitializationStore<NullnessValue,NullnessStore>

org.checkerframework.checker.nullness.NullnessStore

All Implemented Interfaces:

Store<NullnessStore>, org.plumelib.util.UniqueId

public class NullnessStore
extends InitializationStore<NullnessValue,NullnessStore>

Behaves like InitializationStore, but additionally tracks whether PolyNull is known to be NonNull or Nullable (or not known to be either).

Nested Class Summary

Nested classes/interfaces inherited from interface org.checkerframework.dataflow.analysis.Store

Store.FlowRule, Store.Kind

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	isPolyNullNonNull	True if, at this point, PolyNull is known to be NonNull.
protected boolean	isPolyNullNull	True if, at this point, PolyNull is known to be Nullable.

Fields inherited from class org.checkerframework.checker.initialization.InitializationStore

initializedFields, invariantFields

Fields inherited from class org.checkerframework.framework.flow.CFAbstractStore

analysis, arrayValues, classValues, fieldValues, localVariableValues, methodCallExpressions, sequentialSemantics, thisValue

Constructor Summary

Constructors

Constructor	Description
NullnessStore(NullnessStore s)	Create a NullnessStore (copy constructor).
NullnessStore(CFAbstractAnalysis<NullnessValue,NullnessStore,?> analysis, boolean sequentialSemantics)	Create a NullnessStore.

Method Summary

Modifier and Type	Method	Description
protected String	internalVisualize(CFGVisualizer<NullnessValue,NullnessStore,?> viz)	Adds a representation of the internal information of this Store to visualizer viz.
boolean	isPolyNullNonNull()	Returns true if, at this point, PolyNull is known to be NonNull.
boolean	isPolyNullNull()	Returns true if, at this point, PolyNull is known to be Nullable.
NullnessStore	leastUpperBound(NullnessStore other)	Compute the least upper bound of two stores.
void	setPolyNullNonNull(boolean isPolyNullNonNull)	Set the value of whether, at this point, PolyNull is known to be NonNull.
void	setPolyNullNull(boolean isPolyNullNull)	Set the value of whether, at this point, PolyNull is known to be Nullable.
protected boolean	supersetOf(CFAbstractStore<NullnessValue,NullnessStore> o)	Returns true iff this CFAbstractStore contains a superset of the map entries of the argument CFAbstractStore.

Methods inherited from class org.checkerframework.checker.initialization.InitializationStore

addInitializedField, addInitializedField, getAnalysis, insertValue, isFieldInitialized, updateForMethodCall

Methods inherited from class org.checkerframework.framework.flow.CFAbstractStore

canAlias, canInsertJavaExpression, clearValue, computeNewValueAndInsert, copy, equals, getFieldValue, getFieldValues, getUid, getValue, getValue, getValue, getValue, getValue, getValue, hashCode, initializeMethodParameter, initializeThisValue, insertOrRefine, insertOrRefine, insertOrRefinePermitNondeterministic, insertThisValue, insertValue, insertValue, insertValuePermitNondeterministic, insertValuePermitNondeterministic, isMonotonicUpdate, isSideEffectFree, newFieldValueAfterMethodCall, newMonotonicFieldValueAfterMethodCall, removeConflicting, removeConflicting, removeConflicting, replaceValue, shouldInsert, toString, updateForArrayAssignment, updateForAssignment, updateForFieldAccessAssignment, updateForLocalVariableAssignment, visualize, widenedUpperBound

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.plumelib.util.UniqueId

getClassAndUid

Field Details

isPolyNullNonNull

protected boolean isPolyNullNonNull

True if, at this point, PolyNull is known to be NonNull.

isPolyNullNull

protected boolean isPolyNullNull

True if, at this point, PolyNull is known to be Nullable.

Constructor Details

NullnessStore

public NullnessStore(CFAbstractAnalysis<NullnessValue,NullnessStore,?> analysis,
 boolean sequentialSemantics)

Create a NullnessStore.

Parameters:

analysis - the analysis class this store belongs to

sequentialSemantics - should the analysis use sequential Java semantics (i.e., assume that only one thread is running at all times)?

NullnessStore

public NullnessStore(NullnessStore s)

Create a NullnessStore (copy constructor).

Parameters:

s - a store to copy

Method Details

leastUpperBound

public NullnessStore leastUpperBound(NullnessStore other)

Description copied from interface: Store

Compute the least upper bound of two stores.

Important: This method must fulfill the following contract:

• Does not change this.
• Does not change other.
• Returns a fresh object which is not aliased yet.
• Returns an object of the same (dynamic) type as this, even if the signature is more permissive.
• Is commutative.

Specified by:

leastUpperBound in interface Store<NullnessStore>

Overrides:

leastUpperBound in class InitializationStore<NullnessValue,NullnessStore>

supersetOf

protected boolean supersetOf(CFAbstractStore<NullnessValue,NullnessStore> o)

Description copied from class: CFAbstractStore

Returns true iff this CFAbstractStore contains a superset of the map entries of the argument CFAbstractStore. Note that we test the entry keys and values by Java equality, not by any subtype relationship. This method is used primarily to simplify the equals predicate.

Overrides:

supersetOf in class InitializationStore<NullnessValue,NullnessStore>

internalVisualize

protected String internalVisualize(CFGVisualizer<NullnessValue,NullnessStore,?> viz)

Description copied from class: CFAbstractStore

Adds a representation of the internal information of this Store to visualizer viz.

Overrides:

internalVisualize in class InitializationStore<NullnessValue,NullnessStore>

Parameters:

viz - the visualizer

Returns:

a representation of the internal information of this Store

isPolyNullNonNull

public boolean isPolyNullNonNull()

Returns true if, at this point, PolyNull is known to be NonNull.

Returns:

true if, at this point, PolyNull is known to be NonNull

setPolyNullNonNull

public void setPolyNullNonNull(boolean isPolyNullNonNull)

Set the value of whether, at this point, PolyNull is known to be NonNull.

Parameters:

isPolyNullNonNull - whether, at this point, PolyNull is known to be NonNull

isPolyNullNull

public boolean isPolyNullNull()

Returns true if, at this point, PolyNull is known to be Nullable.

Returns:

true if, at this point, PolyNull is known to be Nullable

setPolyNullNull

public void setPolyNullNull(boolean isPolyNullNull)

Set the value of whether, at this point, PolyNull is known to be Nullable.

Parameters:

isPolyNullNull - whether, at this point, PolyNull is known to be Nullable