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//
// EdgeUpdate.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;
namespace Mono.CodeContracts.Static.Analysis.HeapAnalysis.SymbolicGraph {
class EdgeUpdate<TFunc, TAbstractDomain> : Update<TFunc, TAbstractDomain>
where TFunc : IEquatable<TFunc>, IConstantInfo
where TAbstractDomain : IAbstractDomainForEGraph<TAbstractDomain>, IEquatable<TAbstractDomain> {
private readonly SymValue from;
private readonly TFunc function;
public EdgeUpdate (SymValue from, TFunc function)
{
this.from = from;
this.function = function;
}
#region Overrides of Update
public override void Replay (MergeInfo<TFunc, TAbstractDomain> merge)
{
if (!merge.IsCommon (this.from))
return;
SymValue sv1 = merge.Graph1.LookupWithoutManifesting (this.from, this.function);
SymValue sv2 = merge.Graph2.LookupWithoutManifesting (this.from, this.function);
if (DebugOptions.Debug)
{
Console.WriteLine ("Replay edge update: {0} -{1} -> [ {2}, {3} ]",
this.from, this.function, sv1, sv2);
}
if (sv1 == null) {
if (this.function.KeepAsBottomField && merge.Graph1.HasAllBottomFields (this.from))
sv1 = merge.Graph1.BottomPlaceHolder;
else {
if (sv2 == null || merge.Widen || !this.function.ManifestField)
return;
if (DebugOptions.Debug)
{
Console.WriteLine ("---SymGraph changed due to manifestation of a top edge in Graph1");
}
merge.Changed = true;
}
}
if (sv2 == null) {
if (this.function.KeepAsBottomField && merge.Graph2.HasAllBottomFields (this.from))
sv2 = merge.Graph2.BottomPlaceHolder;
else {
if (merge.Widen || !this.function.ManifestField)
return;
if (DebugOptions.Debug)
{
Console.WriteLine ("---SymGraph changed due to manifestation of due to missing target in Graph2");
}
merge.Changed = true;
return;
}
}
SymValue r = merge.AddJointEdge (sv1, sv2, this.function, this.from);
if (r == null || r.UniqueId <= merge.LastCommonVariable)
return;
merge.JoinSymbolicValue (sv1, sv2, r);
}
public override void ReplayElimination (MergeInfo<TFunc, TAbstractDomain> merge)
{
}
#endregion
}
}
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