de.uka.ilkd.key.axiom_abstraction.signanalysis

Class Zero

java.lang.Object

de.uka.ilkd.key.axiom_abstraction.AbstractDomainElement

de.uka.ilkd.key.axiom_abstraction.signanalysis.SignAnalysisDomainElem

de.uka.ilkd.key.axiom_abstraction.signanalysis.Zero

All Implemented Interfaces:

Named

public class Zero
extends SignAnalysisDomainElem

The Zero element of the sign lattice, representing only the number 0.

Author:

Dominic Scheurer

Field Summary

Fields

Modifier and Type	Field and Description
private static Zero	INSTANCE

Constructor Summary

Constructors

Modifier	Constructor and Description
private	Zero()

Method Summary

Modifier and Type	Method and Description
Term	getDefiningAxiom(Term varOrConst, Services services) Return the defining axiom, instantiated for a given Term (skolem constant or logical / program variable).
static Zero	getInstance()
Name	name() returns the name of this element

Methods inherited from class de.uka.ilkd.key.axiom_abstraction.signanalysis.SignAnalysisDomainElem

isBottom, isGeq, isLeq, isNeg, isPos, isTop, isZero

Methods inherited from class de.uka.ilkd.key.axiom_abstraction.AbstractDomainElement

toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

INSTANCE

private static final Zero INSTANCE

Constructor Detail

Zero

private Zero()

Method Detail

getInstance

public static Zero getInstance()

name

public Name name()

Description copied from interface: Named

returns the name of this element

Returns:

the name of the element

getDefiningAxiom

public Term getDefiningAxiom(Term varOrConst,
                             Services services)

Description copied from class: AbstractDomainElement

Return the defining axiom, instantiated for a given Term (skolem constant or logical / program variable). The term can be seen as a representative of this abstract domain element; the returned formula must formally specify this.

If this element describes, for instance, all numbers divisible by 2, the method could return the formula "varOrConst % 2 == 0".

Specified by:

getDefiningAxiom in class AbstractDomainElement

Parameters:

varOrConst - The logical / program variable or skolem constant representing an instance of this abstract domain element.

services - A services object.

Returns:

A JavaDL formula expressing that the given variable or constant represents an instance of this abstract domain element.