public FlatDomain <T> Join(FlatDomain <T> that, bool widening, out bool weaker)
{
if (IsTop || that.IsBottom)
{
weaker = false;
return(this);
}
if (that.IsTop)
{
weaker = !IsTop;
return(that);
}
if (IsBottom)
{
weaker = !that.IsBottom;
return(that);
}
if (Value.Equals(that.Value))
{
weaker = false;
return(that);
}
weaker = true;
return(TopValue);
}
public bool Equals(FlatDomain <T> that)
{
if (!this.IsNormal())
{
return(state == that.state);
}
return(that.IsNormal() && Value.Equals(that.Value));
}
public bool LessEqual (FlatDomain<T> that)
{
if (that.IsTop || IsBottom)
return true;
if (IsTop || that.IsBottom)
return false;
//less equal means equality of values
return this.Concrete.Equals (that.Concrete);
}
public FlatDomain<T> Meet (FlatDomain<T> that)
{
if (IsTop || that.IsBottom)
return that;
if (that.IsTop || IsBottom)
return this;
if (this.Concrete.Equals (that.Concrete))
return that;
return BottomValue;
}
public bool LessEqual(FlatDomain <T> that)
{
bool result;
if (this.TryTrivialLessEqual(that, out result))
{
return(result);
}
return(Value.Equals(that.Value));
}
public FlatDomain <T> Meet(FlatDomain <T> that)
{
FlatDomain <T> result;
if (this.TryTrivialMeet(that, out result))
{
return(result);
}
return(Value.Equals(that.Value) ? this : BottomValue);
}
public FlatDomain <T> Join(FlatDomain <T> that)
{
FlatDomain <T> result;
if (this.TryTrivialJoin(that, out result))
{
return(result);
}
// this and that must be normal here
return(Value.Equals(that.Value) ? this : TopValue);
}
public bool Equals (FlatDomain<T> that)
{
if (!this.IsNormal)
return this._kind == that._kind;
if (!that.IsNormal)
return false;
if (this.Concrete.Equals (that.Concrete))
return true;
return false;
}
public FlatDomain<T> Join (FlatDomain<T> that, bool widening, out bool weaker)
{
if (IsTop || that.IsBottom) {
weaker = false;
return this;
}
if (that.IsTop) {
weaker = !IsTop;
return that;
}
if (IsBottom) {
weaker = !that.IsBottom;
return that;
}
if (this.Concrete.Equals (that.Concrete)) {
weaker = false;
return that;
}
weaker = true;
return TopValue;
}
public FlatDomain <T> Widen(FlatDomain <T> that)
{
// no widening - it's finite lattice
return(Join(that));
}