private Model.Element getValue(VCExpr arg, Model model)
{
if (arg is VCExprLiteral)
{
return(model.GetElement(arg.ToString()));
}
else if (arg is VCExprVar)
{
var el = model.GetFunc(prover.Context.Lookup(arg as VCExprVar));
Debug.Assert(el.Arity == 0 && el.AppCount == 1);
return(el.Apps.First().Result);
}
else
{
Debug.Assert(false);
return(null);
}
}
private Model.Element getValue(VCExpr arg, Model model)
{
if (arg is VCExprLiteral)
{
//return model.GetElement(arg.ToString());
return model.MkElement(arg.ToString());
}
else if (arg is VCExprVar)
{
var el = model.TryGetFunc(prover.Context.Lookup(arg as VCExprVar));
if (el != null)
{
Debug.Assert(el.Arity == 0 && el.AppCount == 1);
return el.Apps.First().Result;
}
else
{
// Variable not defined; assign arbitrary value
if (arg.Type.IsBool)
return model.MkElement("false");
else if (arg.Type.IsInt)
return model.MkIntElement(0);
else
return null;
}
}
else if (arg is VCExprNAry && (arg as VCExprNAry).Op is VCExprBvOp)
{
// support for BV constants
var bvc = (arg as VCExprNAry)[0] as VCExprLiteral;
if (bvc != null)
{
var ret = model.TryMkElement(bvc.ToString() + arg.Type.ToString());
if (ret != null && (ret is Model.BitVector)) return ret;
}
}
var val = prover.Evaluate(arg);
if (val is int || val is bool || val is Microsoft.Basetypes.BigNum)
{
return model.MkElement(val.ToString());
}
else
{
Debug.Assert(false);
}
return null;
}