Class NullaryStatement<T extends IVariable<T>>

java.lang.Object

com.ibm.wala.util.graph.impl.NodeWithNumber

com.ibm.wala.fixpoint.AbstractStatement<T, NullaryOperator<T>>

com.ibm.wala.fixedpoint.impl.NullaryStatement<T>

All Implemented Interfaces:

IFixedPointStatement<T>, INodeWithNumber

Direct Known Subclasses:

BasicNullaryStatement

public abstract class NullaryStatement<T extends IVariable<T>>
extends AbstractStatement<T, NullaryOperator<T>>

Represents a single step, restricted to a nullary operator.

Field Summary

Fields

Modifier and Type	Field	Description
protected final T	lhs	The operands

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	NullaryStatement(T lhs)	Constructor for case of one operand on the right-hand side.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
byte	evaluate()	Evaluate this equation, setting a new value for the left-hand side.
T	getLHS()	Return the left-hand side of this equation.
T[]	getRHS()	returns the list of free variables appearing in the right-hand side of the statement
int	hashCode()	Subclasses must implement this, to prevent non-determinism.
boolean	hasVariable(T cell)	Does this equation contain an appearance of a given cell?

Methods inherited from class AbstractStatement

getOperator, getOrderNumber, toString

Methods inherited from class NodeWithNumber

getGraphNodeId, setGraphNodeId

Methods inherited from class Object

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

Methods inherited from interface INodeWithNumber

getGraphNodeId, setGraphNodeId

Field Details

lhs

protected final T extends IVariable<T> lhs

The operands

Constructor Details

NullaryStatement

protected NullaryStatement(T lhs)

Constructor for case of one operand on the right-hand side.

Parameters:

lhs - the lattice cell set by this equation

Method Details

evaluate

public byte evaluate()

Evaluate this equation, setting a new value for the left-hand side.

Returns:

a constant defined by FixedPointConstants that reflects whether the lhs value changed

getLHS

public T getLHS()

Return the left-hand side of this equation.

Returns:

the lattice cell this equation computes

hasVariable

public boolean hasVariable(T cell)

Does this equation contain an appearance of a given cell?

Parameters:

cell - the cell in question

Returns:

true or false

equals

public boolean equals(Object o)

Specified by:

equals in class AbstractStatement<T extends IVariable<T>, NullaryOperator<T extends IVariable<T>>>

hashCode

public int hashCode()

Description copied from class: AbstractStatement

Subclasses must implement this, to prevent non-determinism.

Specified by:

hashCode in class AbstractStatement<T extends IVariable<T>, NullaryOperator<T extends IVariable<T>>>

getRHS

public T[] getRHS()
           throws UnsupportedOperationException

Description copied from interface: IFixedPointStatement

returns the list of free variables appearing in the right-hand side of the statement

Throws:

UnsupportedOperationException