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