com.ibm.wala.dataflow.graph

Class BooleanUnion

java.lang.Object

com.ibm.wala.fixpoint.AbstractOperator<T>

com.ibm.wala.dataflow.graph.AbstractMeetOperator<BooleanVariable>

com.ibm.wala.dataflow.graph.BooleanUnion

All Implemented Interfaces:

FixedPointConstants

public class BooleanUnion
extends AbstractMeetOperator<BooleanVariable>

Operator U(n) = U(n) U U(j)

Field Summary

Fields inherited from interface com.ibm.wala.fixpoint.FixedPointConstants

CHANGED, CHANGED_AND_FIXED, CHANGED_MASK, FIXED_MASK, NOT_CHANGED, NOT_CHANGED_AND_FIXED, SIDE_EFFECT_MASK

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
byte	evaluate(BooleanVariable lhs, BooleanVariable[] rhs) Evaluate this equation, setting a new value for the left-hand side.
int	hashCode()
static BooleanUnion	instance()
String	toString()

Methods inherited from class com.ibm.wala.dataflow.graph.AbstractMeetOperator

isUnaryNoOp

Methods inherited from class java.lang.Object

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

Method Detail

instance

public static BooleanUnion instance()

toString

public String toString()

Specified by:

toString in class AbstractOperator<BooleanVariable>

See Also:

Object.toString()

hashCode

public int hashCode()

Specified by:

hashCode in class AbstractOperator<BooleanVariable>

equals

public boolean equals(Object o)

Specified by:

equals in class AbstractOperator<BooleanVariable>

evaluate

public byte evaluate(BooleanVariable lhs,
                     BooleanVariable[] rhs)
              throws NullPointerException

Description copied from class: AbstractOperator

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

Specified by:

evaluate in class AbstractOperator<BooleanVariable>

Returns:

a code that indicates: 1) has the lhs value changed? 2) has this equation reached a fixed-point, in that we never have to evaluate the equation again, even if rhs operands change?

Throws:

NullPointerException