Package com.ibm.wala.fixedpoint.impl

Class NullaryOperator<T extends IVariable<T>>

java.lang.Object

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

com.ibm.wala.fixedpoint.impl.NullaryOperator<T>

All Implemented Interfaces:

FixedPointConstants

Direct Known Subclasses:

TypeInference.DeclaredTypeOperator

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

An operator of the form lhs = op

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

Constructors

Constructor	Description
NullaryOperator()

Method Summary

Modifier and Type	Method	Description
abstract byte	evaluate(T lhs)	Evaluate this equation, setting a new value for the left-hand side.
byte	evaluate(T lhs, T[] rhs)	Evaluate this equation, setting a new value for the left-hand side.

Methods inherited from class com.ibm.wala.fixpoint.AbstractOperator

equals, hashCode, toString

Methods inherited from class java.lang.Object

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

Constructor Details

NullaryOperator

public NullaryOperator()

Method Details

evaluate

public byte evaluate(T lhs,
 T[] rhs)
              throws UnsupportedOperationException

Description copied from class: AbstractOperator

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

Specified by:

evaluate in class AbstractOperator<T extends IVariable<T>>

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:

UnsupportedOperationException

evaluate

public abstract byte evaluate(T lhs)

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

Returns:

true if the lhs value changes. false otherwise.