public static ExtendedZ PositiveInfinity()
{
var pos = new ExtendedZ();
pos.PositiveInf = true;
return(pos);
}
public static ExtendedZ NegativeInfinity()
{
var nega = new ExtendedZ();
nega.NegativeInf = true;
return(nega);
}
private IADomain ReadTransfer(ReadStmt readStmt, IADomain domain)
{
var newDomain = CopyDomain(domain);
if (domain.IsBottom())
{
return(newDomain);
}
var ident = readStmt.Left switch
{
VarAccess varAccess => varAccess.Left,
ArrayAccess arrayAccess => arrayAccess.Left,
RecordAccess recordAccess => recordAccess.Right,
};
if (readStmt.Left is ArrayAccess)
{
var ra = readStmt.Left as ArrayAccess;
var indexInterval = IAUtil.Arithmetic(ra.Right, domain);
if (indexInterval.IsBottom)
{
return(Bottom().GetDomain());
}
}
newDomain[ident] = new Interval(ExtendedZ.NegativeInfinity(), ExtendedZ.PositiveInfinity()).ToIntervalK(_program);
return(newDomain);
}
public static ExtendedZ Max(ExtendedZ left, ExtendedZ right)
{
if (left.PositiveInf || right.PositiveInf)
{
return(ExtendedZ.PositiveInfinity());
}
if (left.NegativeInf)
{
return(right);
}
if (right.NegativeInf)
{
return(left);
}
return(new ExtendedZ(BigInteger.Max(left.Value, right.Value)));
}
public Interval(ExtendedZ lower, ExtendedZ upper)
{
LowerBound = lower;
UpperBound = upper;
}
