Package 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	Description
Unknown(Tree tree)	Create a new Unknown JavaExpression.
Unknown(TypeMirror type)	Create a new Unknown JavaExpression.
Unknown(TypeMirror type, String originalExpression)	Create a new Unknown JavaExpression.
Unknown(Node node)	Create a new Unknown JavaExpression.

Method Summary

Modifier and Type	Method	Description
<R, P> R	accept(JavaExpressionVisitor<R,P> visitor, P p)	Accept method of the visitor pattern.
<T extends JavaExpression> @Nullable T	containedOfClass(Class<T> clazz)	Returns the first subexpression whose class is the given class, or null.
boolean	containsModifiableAliasOf(Store<?> store, JavaExpression other)	Returns true if and only if other appears anywhere in this or an expression appears in this such that other might alias this expression, and that expression is modifiable.
boolean	containsSyntacticEqualJavaExpression(JavaExpression other)	Returns true if and only if this contains a JavaExpression that is syntactically equal to other.
boolean	equals(@Nullable Object obj)
int	hashCode()
boolean	isAssignableByOtherCode()	Returns true if some subexpression of this can be assigned to from outside the current method body.
boolean	isDeterministic(AnnotationProvider provider)	Returns true if the expression is deterministic.
boolean	isModifiableByOtherCode()	Returns true if the value this expression stands for can be changed by a method call; equivalently, if the value this expression evaluates to can be changed by a side effect from outside the containing method.
boolean	syntacticEquals(JavaExpression je)	Returns true if and only if the two Java expressions are syntactically identical.
String	toString()

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

atConstructorInvocation, atFieldAccess, atMethodBody, atMethodInvocation, atMethodInvocation, containedUnknown, containsOfClass, containsUnknown, fromArrayAccess, fromNode, fromNodeFieldAccess, fromTree, fromVariableTree, getFormalParameters, getImplicitReceiver, getParametersAsLocalVariables, getPseudoReceiver, getReceiver, getType, isUnassignableByOtherCode, isUnmodifiableByOtherCode, listContainsSyntacticEqualJavaExpression, listIsDeterministic, syntacticEqualsList, toStringDebug

Methods inherited from class java.lang.Object

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

Constructor Details

Unknown

public Unknown(TypeMirror type)

Create a new Unknown JavaExpression.

Parameters:

type - the Java type of this

Unknown

public Unknown(TypeMirror type,
 String originalExpression)

Create a new Unknown JavaExpression.

Parameters:

type - the Java type of this

originalExpression - a String representation of the expression that has no corresponding JavaExpression

Unknown

public Unknown(Tree tree)

Create a new Unknown JavaExpression.

Parameters:

tree - a tree that does not have a corresponding JavaExpression

Unknown

public Unknown(Node node)

Create a new Unknown JavaExpression.

Parameters:

node - a node that does not have a corresponding JavaExpression

Method Details

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

containedOfClass

public <T extends JavaExpression> @Nullable T containedOfClass(Class<T> clazz)

Description copied from class: JavaExpression

Returns the first subexpression whose class is the given class, or null.

This is intended as a diagnostic aid; most clients will use JavaExpression.containsOfClass(java.lang.Class<? extends org.checkerframework.dataflow.expression.JavaExpression>).

Specified by:

containedOfClass in class JavaExpression

Type Parameters:

T - the type corresponding to clazz

Parameters:

clazz - the JavaExpression subclass to search for

Returns:

true if some subexpression whose class is the given class

isDeterministic

public boolean isDeterministic(AnnotationProvider provider)

Description copied from class: JavaExpression

Returns true if the expression is deterministic.

Specified by:

isDeterministic in class JavaExpression

Parameters:

provider - an annotation provider (a type factory)

Returns:

true if this expression is deterministic

isAssignableByOtherCode

public boolean isAssignableByOtherCode()

Description copied from class: JavaExpression

Returns true if some subexpression of this can be assigned to from outside the current method body.

This is false for local variables, the self reference, final field accesses whose receiver is JavaExpression.isUnassignableByOtherCode(), and operations whose operands are all not JavaExpression.isModifiableByOtherCode().

Overrides:

isAssignableByOtherCode in class JavaExpression

Returns:

true if some subexpression of this can be assigned to from outside the current method body

See Also:

• JavaExpression.isModifiableByOtherCode()

isModifiableByOtherCode

public boolean isModifiableByOtherCode()

Description copied from class: JavaExpression

Returns true if the value this expression stands for can be changed by a method call; equivalently, if the value this expression evaluates to can be changed by a side effect from outside the containing method.

Approximately, this returns true if the expression is JavaExpression.isAssignableByOtherCode() or its type is mutable. (String is an immutable type.)

Overrides:

isModifiableByOtherCode in class JavaExpression

Returns:

true if the value of this expression can be changed from outside the current method body

See Also:

• JavaExpression.isUnassignableByOtherCode()

syntacticEquals

public boolean syntacticEquals(JavaExpression je)

Description copied from class: JavaExpression

Returns true if and only if the two Java expressions are syntactically identical.

This exists for use by JavaExpression.containsSyntacticEqualJavaExpression(org.checkerframework.dataflow.expression.JavaExpression).

Specified by:

syntacticEquals in class JavaExpression

Parameters:

je - the other Java expression to compare to this one

Returns:

true if and only if the two Java expressions are syntactically identical

containsSyntacticEqualJavaExpression

public boolean containsSyntacticEqualJavaExpression(JavaExpression other)

Description copied from class: JavaExpression

Returns true if and only if this contains a JavaExpression that is syntactically equal to other.

Specified by:

containsSyntacticEqualJavaExpression in class JavaExpression

Parameters:

other - the JavaExpression to search for

Returns:

true if and only if this contains a JavaExpression that is syntactically equal to other

containsModifiableAliasOf

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

Description copied from class: JavaExpression

Returns true if and only if other appears anywhere in this or an expression appears in this 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

accept

public <R,
P> R accept(JavaExpressionVisitor<R,P> visitor,
 P p)

Description copied from class: JavaExpression

Accept method of the visitor pattern.

Specified by:

accept in class JavaExpression

Type Parameters:

R - result type of the operation

P - parameter type

Parameters:

visitor - the visitor to be applied to this JavaExpression

p - the parameter for this operation

Returns:

the result of visiting this