Class BitVectorIntersection

java.lang.Object

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

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

com.ibm.wala.dataflow.graph.BitVectorIntersection

All Implemented Interfaces:

FixedPointConstants

public final class BitVectorIntersection
extends AbstractMeetOperator<BitVectorVariable>

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

Field Summary

Fields inherited from interface FixedPointConstants

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

Modifier and Type	Field	Description
static final byte	CHANGED	A return value which indicates that a lhs has changed, and the statement might need to be evaluated again.
static final byte	CHANGED_AND_FIXED	A return value which indicates that lhs has changed, and the statement need not be evaluated again.
static final int	CHANGED_MASK	The bit-mask which defines the "CHANGED" flag
static final int	FIXED_MASK	The bit-mask which defines the "FIXED" flag
static final byte	NOT_CHANGED	A return value which indicates that lhs has not changed, and the statement might need to be evaluated again.
static final byte	NOT_CHANGED_AND_FIXED	A return value which indicates that lhs has not changed, and the statement need not be evaluated again.
static final int	SIDE_EFFECT_MASK	The bit-mask which defines the "SIDE EFFECT" flag

Method Summary

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

Methods inherited from class AbstractMeetOperator

isUnaryNoOp

Modifier and Type	Method	Description
boolean	isUnaryNoOp()	subclasses can override if needed

Methods inherited from class Object

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

Method Details

instance

public static BitVectorIntersection instance()

evaluate

public byte evaluate(BitVectorVariable lhs,
 BitVectorVariable[] rhs)

Description copied from class: AbstractOperator

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

Specified by:

evaluate in class AbstractOperator<BitVectorVariable>

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?

hashCode

public int hashCode()

Specified by:

hashCode in class AbstractOperator<BitVectorVariable>

equals

public boolean equals(Object o)

Specified by:

equals in class AbstractOperator<BitVectorVariable>

toString

public String toString()

Specified by:

toString in class AbstractOperator<BitVectorVariable>