com.ibm.wala.fixpoint
Class AbstractOperator<T extends IVariable>

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>
extends java.lang.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 com.ibm.wala.fixpoint.FixedPointConstants

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

Constructor Summary

AbstractOperator()

Method Summary

abstract boolean	equals(java.lang.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 java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractOperator

public AbstractOperator()

Method Detail

evaluate

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

Evaluate this equation, setting a new value for the left-hand side. Note that the RHS is an IVariable[] and not a T[] because the framework may be need to allocate an array for the rhs, and we cannot do new T[] in Java.

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 java.lang.Object

equals

public abstract boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

toString

public abstract java.lang.String toString()

Overrides:

toString in class java.lang.Object