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//
// SpecialPathElement.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 Mono.CodeContracts.Static.AST;
using Mono.CodeContracts.Static.DataStructures;
using Mono.CodeContracts.Static.Providers;
namespace Mono.CodeContracts.Static.Analysis.HeapAnalysis.Paths {
class SpecialPathElement : PathElement<SpecialPathElementKind> {
private object type;
public SpecialPathElement (SpecialPathElementKind element, SymFunction c) : base (element, element.ToString (), c)
{
this.castTo = "";
}
public override bool IsAddressOf
{
get { return false; }
}
public override bool IsDeref
{
get { return this.Element == SpecialPathElementKind.Deref; }
}
public override bool TryGetResultType (out TypeNode resultType)
{
if (this.type is TypeNode) {
resultType = (TypeNode) this.type;
return true;
}
resultType = default (TypeNode);
return false;
}
public override bool TrySetType (TypeNode expectedType, IMetaDataProvider metaDataProvider, out TypeNode resultType)
{
switch (this.Element) {
case SpecialPathElementKind.Length:
this.castTo = metaDataProvider.IsArray (expectedType)
|| metaDataProvider.System_String.Equals (expectedType)
? ""
: "System.Array";
resultType = metaDataProvider.System_Int32;
return true;
case SpecialPathElementKind.Deref:
if (metaDataProvider.IsManagedPointer (expectedType)) {
TypeNode type = metaDataProvider.ElementType (expectedType);
this.type = type;
resultType = type;
return true;
}
resultType = default(TypeNode);
return false;
default:
resultType = default(TypeNode);
return false;
}
}
public override Result Decode<Data, Result, Visitor, Label> (Label label, Visitor visitor, Data data)
{
switch (this.Element) {
case SpecialPathElementKind.Length:
return visitor.LoadLength (label, Dummy.Value, Dummy.Value, data);
case SpecialPathElementKind.Deref:
throw new NotImplementedException ();
default:
throw new InvalidOperationException ();
}
}
}
}
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