com.ibm.wala.fixedpoint.impl
Class UnaryOperator

java.lang.Object
  com.ibm.wala.fixedpoint.impl.AbstractOperator
      com.ibm.wala.fixedpoint.impl.UnaryOperator

All Implemented Interfaces:

FixedPointConstants

Direct Known Subclasses:

BitVectorFilter, BitVectorIdentity, BitVectorKillGen, BitVectorMinusVector, BitVectorOr, BitVectorUnionConstant, BitVectorUnionVector, BooleanIdentity, PropagationCallGraphBuilder.FilterOperator, PropagationCallGraphBuilder.InstanceArrayStoreOperator, PropagationCallGraphBuilder.InstancePutFieldOperator, TrueOperator, UnaryBitVectorUnion, UnaryOr, UnarySideEffect

public abstract class UnaryOperator
extends AbstractOperator
implements FixedPointConstants

An operator of the form lhs = op (rhs)

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

UnaryOperator()

Method Summary

abstract byte	evaluate(IVariable lhs, IVariable rhs) Evaluate this equation, setting a new value for the left-hand side.
byte	evaluate(IVariable lhs, IVariable[] rhs) Evaluate this equation, setting a new value for the left-hand side.
boolean	isIdentity() Method isIdentity.
UnaryStatement	makeEquation(IVariable lhs, IVariable rhs) Create an equation which uses this operator Override in subclasses for efficiency.

Methods inherited from class com.ibm.wala.fixedpoint.impl.AbstractOperator

equals, hashCode, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

UnaryOperator

public UnaryOperator()

Method Detail

evaluate

public abstract byte evaluate(IVariable lhs,
                              IVariable rhs)

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

Returns:

true if the lhs value changes. false otherwise.

makeEquation

public UnaryStatement makeEquation(IVariable lhs,
                                   IVariable rhs)

Create an equation which uses this operator Override in subclasses for efficiency.

isIdentity

public boolean isIdentity()

Method isIdentity.

Returns:

boolean

evaluate

public byte evaluate(IVariable lhs,
                     IVariable[] rhs)
              throws UnimplementedError

Description copied from class: AbstractOperator

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

Specified by:

evaluate in class AbstractOperator

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:

UnimplementedError