org.checkerframework.dataflow.expression

Class Unknown

java.lang.Object

org.checkerframework.dataflow.expression.JavaExpression

org.checkerframework.dataflow.expression.Unknown

@UsesObjectEquals
public class Unknown
extends JavaExpression

Stands for any expression that the Dataflow Framework lacks explicit support for.

Field Summary

Fields inherited from class org.checkerframework.dataflow.expression.JavaExpression

type

Constructor Summary

Constructors

Constructor and Description
Unknown(TypeMirror type) Create a new Unknown receiver.

Method Summary

Modifier and Type	Method and Description
boolean	containsModifiableAliasOf(Store<?> store, JavaExpression other) Returns true if and only if other appears anywhere in this receiver or an expression appears in this receiver such that other might alias this expression, and that expression is modifiable.
boolean	containsOfClass(Class<? extends JavaExpression> clazz)
boolean	equals(@Nullable Object obj)
int	hashCode()
boolean	isUnassignableByOtherCode() Returns true if and only if the value this expression stands for cannot be changed (with respect to ==) by a method call.
boolean	isUnmodifiableByOtherCode() Returns true if and only if the value this expression stands for cannot be changed by a method call, including changes to any of its fields.
String	toString()

Methods inherited from class org.checkerframework.dataflow.expression.JavaExpression

containsSyntacticEqualJavaExpression, containsUnknown, fromArrayAccess, fromNode, fromNode, fromNodeFieldAccess, fromTree, fromTree, getImplicitReceiver, getParametersOfEnclosingMethod, getPseudoReceiver, getReceiver, getType, syntacticEquals, toStringDebug

Methods inherited from class java.lang.Object

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

Constructor Detail

Unknown

public Unknown(TypeMirror type)

Create a new Unknown receiver.

Parameters:

type - the Java type of this receiver

Method Detail

equals

public boolean equals(@Nullable Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

containsModifiableAliasOf

public boolean containsModifiableAliasOf(Store<?> store,
                                         JavaExpression other)

Description copied from class: JavaExpression

Returns true if and only if other appears anywhere in this receiver or an expression appears in this receiver such that other might alias this expression, and that expression is modifiable.

This is always true, except for cases where the Java type information prevents aliasing and none of the subexpressions can alias 'other'.

Overrides:

containsModifiableAliasOf in class JavaExpression

containsOfClass

public boolean containsOfClass(Class<? extends JavaExpression> clazz)

Specified by:

containsOfClass in class JavaExpression

isUnassignableByOtherCode

public boolean isUnassignableByOtherCode()

Description copied from class: JavaExpression

Returns true if and only if the value this expression stands for cannot be changed (with respect to ==) by a method call. This is the case for local variables, the self reference, final field accesses whose receiver is JavaExpression.isUnassignableByOtherCode(), and binary operations whose left and right operands are both JavaExpression.isUnmodifiableByOtherCode().

Specified by:

isUnassignableByOtherCode in class JavaExpression

See Also:

JavaExpression.isUnmodifiableByOtherCode()

isUnmodifiableByOtherCode

public boolean isUnmodifiableByOtherCode()

Description copied from class: JavaExpression

Returns true if and only if the value this expression stands for cannot be changed by a method call, including changes to any of its fields.

Approximately, this returns true if the expression is JavaExpression.isUnassignableByOtherCode() and its type is immutable.

Specified by:

isUnmodifiableByOtherCode in class JavaExpression

See Also:

JavaExpression.isUnassignableByOtherCode()