Class AbstractMeetOperator<T extends IVariable<T>>

java.lang.Object

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

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

All Implemented Interfaces:

FixedPointConstants

Direct Known Subclasses:

BitVectorIntersection, BitVectorUnion, BooleanUnion

public abstract class AbstractMeetOperator<T extends IVariable<T>>
extends AbstractOperator<T>

Abstract superclass for meet operators

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

Constructor Summary

Constructors

Constructor	Description
AbstractMeetOperator()

Method Summary

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

Methods inherited from class AbstractOperator

equals, evaluate, hashCode, toString

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

Methods inherited from class Object

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

Constructor Details

AbstractMeetOperator

public AbstractMeetOperator()

Method Details

isUnaryNoOp

public boolean isUnaryNoOp()

subclasses can override if needed

Returns:

true iff this meet is a noop when applied to one argument