public NonRelationalValueAbstraction(
DisInterval interval, SymbolicExpressionTracker <Variable, Expression> symbolicConditions,
SetOfConstraints <Variable> equalities, SetOfConstraints <Variable> disequalities,
SetOfConstraints <Variable> weakUpperBounds, SetOfConstraints <Variable> strictUpperBounds,
SetOfConstraints <Variable> existential)
{
Contract.Requires(interval != null);
Contract.Requires(symbolicConditions != null);
Contract.Requires(disequalities != null);
Contract.Requires(equalities != null);
Contract.Requires(weakUpperBounds != null);
Contract.Requires(strictUpperBounds != null);
Contract.Requires(existential != null);
disInterval = interval;
this.symbolicConditions = symbolicConditions;
weaklyRelationalDomains = new SetOfConstraints <Variable>[WeaklyRelationalDomainsCount]
{
equalities,
disequalities,
weakUpperBounds,
strictUpperBounds,
existential
};
}
public SymbolicExpressionTracker <Variable, Expression> Widening(SymbolicExpressionTracker <Variable, Expression> other)
{
Contract.Requires(other != null);
Contract.Ensures(Contract.Result <SymbolicExpressionTracker <Variable, Expression> >() != null);
return(this.Join(other));
}
public bool LessEqual(SymbolicExpressionTracker <Variable, Expression> other)
{
Contract.Requires(other != null);
bool result;
if (AbstractDomainsHelper.TryTrivialLessEqual(this, other, out result))
{
return(result);
}
other = this.UnifySlackVariableWith(other);
return(symbolicConditions.LessEqual(other.symbolicConditions));
}
private NonRelationalValueAbstraction(
DisInterval interval, SymbolicExpressionTracker <Variable, Expression> symbolicConditions,
SetOfConstraints <Variable>[] domains)
{
Contract.Requires(interval != null);
Contract.Requires(symbolicConditions != null);
Contract.Requires(domains != null);
Contract.Requires(domains.Length == WeaklyRelationalDomainsCount);
Contract.Requires(Contract.ForAll(domains, el => el != null));
disInterval = interval;
this.symbolicConditions = symbolicConditions;
weaklyRelationalDomains = domains;
}
public SymbolicExpressionTracker <Variable, Expression> Meet(SymbolicExpressionTracker <Variable, Expression> other)
{
Contract.Requires(other != null);
Contract.Ensures(Contract.Result <SymbolicExpressionTracker <Variable, Expression> >() != null);
SymbolicExpressionTracker <Variable, Expression> result;
if (AbstractDomainsHelper.TryTrivialMeet(this, other, out result))
{
return(result);
}
other = UnifySlackVariableWith(other);
return(new SymbolicExpressionTracker <Variable, Expression>(slackVar, symbolicConditions.Meet(other.symbolicConditions)));
}
public NonRelationalValueAbstraction <Variable, Expression> UpdateSymbolicCondition(SymbolicExpressionTracker <Variable, Expression> sc)
{
#region Contracts
Contract.Requires(sc != null);
Contract.Ensures(Contract.Result <NonRelationalValueAbstraction <Variable, Expression> >() != null);
#endregion
return(new NonRelationalValueAbstraction <Variable, Expression>(disInterval,
sc,
weaklyRelationalDomains));
}
private SymbolicExpressionTracker <Variable, Expression> UnifySlackVariableWith(SymbolicExpressionTracker <Variable, Expression> other)
{
Contract.Requires(other != null);
Contract.Ensures(Contract.Result <SymbolicExpressionTracker <Variable, Expression> >() != null);
if (!other.IsNormal() || object.Equals(other.slackVar, slackVar))
{
return(other);
}
var result = new Set <Expression>();
foreach (var exp in other.symbolicConditions.Values)
{
result.AddIfNotNull(variableReplacer(exp, other.slackVar, slackVar));
}
return(result.Count != 0 ?
new SymbolicExpressionTracker <Variable, Expression>(slackVar, new SetOfConstraints <Expression>(result, false)) :
this.Top);
}
