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