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//
// AbstractType.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.IO;
using Mono.CodeContracts.Static.AST;
using Mono.CodeContracts.Static.Lattices;
namespace Mono.CodeContracts.Static.Analysis.HeapAnalysis {
struct AbstractType : IAbstractDomainForEGraph<AbstractType>, IEquatable<AbstractType> {
public static AbstractType TopValue = new AbstractType (FlatDomain<TypeNode>.TopValue, false);
public static AbstractType BottomValue = new AbstractType (FlatDomain<TypeNode>.BottomValue, true);
private FlatDomain<TypeNode> value;
public AbstractType (FlatDomain<TypeNode> value, bool isZero) : this ()
{
IsZero = isZero;
this.value = value;
}
public bool IsZero { get; private set; }
public FlatDomain<TypeNode> Type
{
get { return this.value; }
}
public TypeNode ConcreteType
{
get { return this.value.Value; }
}
private static AbstractType ForManifestedFieldValue
{
get { return TopValue; }
}
public AbstractType ButZero
{
get { return new AbstractType (this.value, true); }
}
public AbstractType With (FlatDomain<TypeNode> type)
{
return new AbstractType (type, this.IsZero);
}
#region IAbstractDomainForEGraph<AbstractType> Members
public AbstractType Top
{
get { return new AbstractType (FlatDomain<TypeNode>.TopValue, false); }
}
public AbstractType Bottom
{
get { return new AbstractType (FlatDomain<TypeNode>.BottomValue, true); }
}
public bool IsTop
{
get { return !IsZero && this.value.IsTop; }
}
public bool IsBottom
{
get { return IsZero && this.value.IsBottom; }
}
public AbstractType Join(AbstractType that)
{
throw new NotImplementedException();
}
public AbstractType Join (AbstractType that, bool widening, out bool weaker)
{
if (that.IsZero) {
weaker = false;
if (this.value.IsBottom)
return new AbstractType (that.value, IsZero);
return this;
}
if (IsZero) {
weaker = true;
if (that.value.IsBottom)
return new AbstractType (this.value, that.IsZero);
return that;
}
FlatDomain<TypeNode> resultType = this.value.Join (that.value, widening, out weaker);
return new AbstractType (resultType, false);
}
public AbstractType Widen(AbstractType that)
{
throw new NotImplementedException();
}
public AbstractType Meet (AbstractType that)
{
return new AbstractType (this.value.Meet (that.value), IsZero || that.IsZero);
}
public bool LessEqual (AbstractType that)
{
if (IsZero)
return true;
if (that.IsZero)
return false;
return this.value.LessEqual (that.value);
}
public AbstractType ImmutableVersion ()
{
return this;
}
public AbstractType Clone ()
{
return this;
}
public void Dump (TextWriter tw)
{
if (IsZero)
tw.Write ("(Zero) ");
this.value.Dump (tw);
}
public bool HasAllBottomFields
{
get { return IsZero; }
}
public AbstractType ForManifestedField ()
{
return ForManifestedFieldValue;
}
#endregion
#region IEquatable<AbstractType> Members
public bool Equals (AbstractType that)
{
return this.IsZero == that.IsZero && this.value.Equals (that.value);
}
#endregion
public override string ToString ()
{
return (IsZero ? "(Zero) " : "") + this.value;
}
}
}
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