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//
// ExprDomain.cs
//
// Authors:
// Alexander Chebaturkin (chebaturkin@gmail.com)
//
// Copyright (C) 2011 Alexander Chebaturkin
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections.Generic;
using System.IO;
using Mono.CodeContracts.Static.Analysis.ExpressionAnalysis.Expressions;
using Mono.CodeContracts.Static.DataStructures;
using Mono.CodeContracts.Static.Lattices;
namespace Mono.CodeContracts.Static.Analysis.ExpressionAnalysis {
class ExprDomain<TSymValue> : IGraph<TSymValue, Dummy>
where TSymValue : IEquatable<TSymValue> {
private readonly EnvironmentDomain<TSymValue, FlatDomain<Expr<TSymValue>>> expressions;
private ExprDomain (EnvironmentDomain<TSymValue, FlatDomain<Expr<TSymValue>>> expressions)
{
this.expressions = expressions;
}
#region Implementation of IGraph<SymbolicValue,Dummy>
public IEnumerable<TSymValue> Keys
{
get { return this.expressions.Keys; }
}
public bool IsBottom
{
get { return this.expressions.IsBottom; }
}
IEnumerable<TSymValue> IGraph<TSymValue, Dummy>.Nodes
{
get { return this.expressions.Keys; }
}
public IEnumerable<Pair<Dummy, TSymValue>> Successors(TSymValue node)
{
FlatDomain<Expr<TSymValue>> expr = this.expressions[node];
if (expr.IsNormal())
foreach (TSymValue sv in expr.Value.Variables)
yield return new Pair<Dummy, TSymValue> (Dummy.Value, sv);
}
#endregion
public FlatDomain<Expr<TSymValue>> this[TSymValue sv]
{
get { return this.expressions[sv]; }
}
public ExprDomain<TSymValue> Join(ExprDomain<TSymValue> that, bool widening, out bool weaker)
{
return new ExprDomain<TSymValue> (this.expressions.Join (that.expressions, widening, out weaker));
}
public static ExprDomain<TSymValue> TopValue(Func<TSymValue, int> keyConverter)
{
return new ExprDomain<TSymValue> (EnvironmentDomain<TSymValue, FlatDomain<Expr<TSymValue>>>.TopValue (keyConverter));
}
public ExprDomain<TSymValue> Add (TSymValue sv, Expr<TSymValue> expr)
{
return new ExprDomain<TSymValue> (this.expressions.With (sv, expr));
}
public ExprDomain<TSymValue> Remove(TSymValue sv)
{
return new ExprDomain<TSymValue> (this.expressions.Without (sv));
}
public ExprDomain<TSymValue> Empty()
{
return new ExprDomain<TSymValue> (this.expressions.Empty ());
}
public bool HasRefinement(TSymValue sv)
{
return this.expressions.Contains (sv);
}
public bool IsReachableFrom(TSymValue source, TSymValue target)
{
bool reachable = false;
DepthFirst.Visit (this, source, sv => {
if (sv.Equals (target))
reachable = true;
return !reachable; // break if reachable
}, null);
return reachable;
}
public void Dump(TextWriter tw)
{
this.expressions.Dump (tw);
}
}
}
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