private bool TryComputeNAryExprs(IdentifierExpr id)
{
var toRemove = new HashSet <Expr>();
foreach (var expr in this.ExpressionMap[id].Keys.ToList())
{
if (!(expr is NAryExpr))
{
continue;
}
int ixs = 0;
if (((expr as NAryExpr).Args[0] is IdentifierExpr) &&
((expr as NAryExpr).Args[0] as IdentifierExpr).Name.StartsWith("$M."))
{
toRemove.Add(expr);
continue;
}
if (PointerArithmeticAnalyser.ShouldSkipFromAnalysis(expr as NAryExpr))
{
toRemove.Add(expr);
continue;
}
if (PointerArithmeticAnalyser.IsArithmeticExpression(expr as NAryExpr))
{
toRemove.Add(expr);
continue;
}
Expr p = (expr as NAryExpr).Args[0];
Expr i = (expr as NAryExpr).Args[1];
Expr s = (expr as NAryExpr).Args[2];
if (!(i is LiteralExpr && s is LiteralExpr))
{
toRemove.Add(expr);
continue;
}
ixs = (i as LiteralExpr).asBigNum.ToInt * (s as LiteralExpr).asBigNum.ToInt;
this.ExpressionMap[id].Add(p, this.ExpressionMap[id][expr] + ixs);
toRemove.Add(expr);
}
foreach (var expr in toRemove)
{
this.ExpressionMap[id].Remove(expr);
}
if (this.ExpressionMap[id].Any(val => val.Key is NAryExpr))
{
return(false);
}
return(true);
}
/// <summary>
/// Compute $pa(p, i, s) == p + i * s);
/// </summary>
/// <returns>The root pointer.</returns>
/// <param name="impl">Implementation</param>
/// <param name="label">Root block label</param>
/// <param name="id">Identifier expression</param>
public static Expr ComputeRootPointer(Implementation impl, string label, Expr id)
{
if (id is LiteralExpr)
{
return(id);
}
if (id is NAryExpr && (id as NAryExpr).Args.Count == 1 &&
(id as NAryExpr).Fun.FunctionName.Equals("-"))
{
return(id);
}
NAryExpr root = PointerArithmeticAnalyser.GetPointerArithmeticExpr(impl, id) as NAryExpr;
if (root == null)
{
return(id);
}
Expr result = root;
Expr resolution = result;
int ixs = 0;
var alreadyVisited = new HashSet <Tuple <string, Expr> >();
do
{
if (result is NAryExpr)
{
if (((result as NAryExpr).Args[0] is IdentifierExpr) &&
((result as NAryExpr).Args[0] as IdentifierExpr).Name.StartsWith("$M."))
{
return(id);
}
if (PointerArithmeticAnalyser.TryPerformCast(ref result))
{
continue;
}
if (PointerArithmeticAnalyser.ShouldSkipFromAnalysis(result as NAryExpr))
{
return(id);
}
if (alreadyVisited.Any(v => v.Item1.Equals(label) && v.Item2.Equals(result)))
{
return(id);
}
alreadyVisited.Add(new Tuple <string, Expr>(label, result));
if (PointerArithmeticAnalyser.IsArithmeticExpression(result as NAryExpr))
{
return(id);
}
Expr p = (result as NAryExpr).Args[0];
Expr i = (result as NAryExpr).Args[1];
Expr s = (result as NAryExpr).Args[2];
if ((i is LiteralExpr) && (s is LiteralExpr))
{
ixs += (i as LiteralExpr).asBigNum.ToInt * (s as LiteralExpr).asBigNum.ToInt;
}
else
{
return(id);
}
result = p;
}
else
{
resolution = PointerArithmeticAnalyser.GetPointerArithmeticExpr(impl, result);
if (resolution != null)
{
result = resolution;
}
}
}while (resolution != null);
return(Expr.Add(result, new LiteralExpr(Token.NoToken, BigNum.FromInt(ixs))));
}
