Class AbstractOperator<T extends IVariable<T>>

java.lang.Object

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

All Implemented Interfaces:

FixedPointConstants

Direct Known Subclasses:

AbstractMeetOperator, NullaryOperator, TypeInference.PrimitivePropagateOperator, UnaryOperator

public abstract class AbstractOperator<T extends IVariable<T>>
extends Object
implements FixedPointConstants

operator for a step in an iterative solver

This is an abstract class and not an interface in order to force subclasses to re-implement equals(), hashCode(), and toString()

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
AbstractOperator()

Method Summary

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

AbstractOperator

public AbstractOperator()

Method Details

evaluate

public abstract byte evaluate(T lhs,
 T[] rhs)

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

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 abstract int hashCode()

Overrides:

hashCode in class Object

equals

public abstract boolean equals(Object o)

Overrides:

equals in class Object

toString

public abstract String toString()

Overrides:

toString in class Object