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//
// ForwardAnalysis.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.Visitors;
using Mono.CodeContracts.Static.Analysis;
using Mono.CodeContracts.Static.ControlFlow;
using Mono.CodeContracts.Static.DataStructures;
using Mono.CodeContracts.Static.Providers;
namespace Mono.CodeContracts.Static.DataFlowAnalysis {
class ForwardAnalysis<AbstractState, EdgeData> :
ForwardDataFlowAnalysisBase<AbstractState>,
IFixPointInfo<APC, AbstractState> {
private readonly Action<Pair<AbstractState, TextWriter>> dumper;
private readonly EdgeConverter<APC, AbstractState, EdgeData> edge_converter;
private readonly Func<APC, APC, EdgeData> edge_data_getter;
private readonly Func<AbstractState, AbstractState> immutable_version;
private readonly Func<APC, AbstractState, bool> is_bottom;
private readonly Joiner<APC, AbstractState> joiner;
private readonly Func<AbstractState, AbstractState> mutable_version;
private readonly Func<APC, AbstractState, AbstractState> transfer;
public ForwardAnalysis (ICFG cfg,
Func<APC, AbstractState, AbstractState> transfer,
Joiner<APC, AbstractState> joiner,
Func<AbstractState, AbstractState> immutableVersion,
Func<AbstractState, AbstractState> mutableVersion,
EdgeConverter<APC, AbstractState, EdgeData> edgeConverter,
Func<APC, APC, EdgeData> edgeDataGetter,
Func<APC, AbstractState, bool> isBottom,
Action<Pair<AbstractState, TextWriter>> dumper) : base (cfg)
{
this.transfer = transfer;
this.joiner = joiner;
this.immutable_version = immutableVersion;
this.mutable_version = mutableVersion;
this.edge_converter = edgeConverter;
this.edge_data_getter = edgeDataGetter;
this.is_bottom = isBottom;
this.dumper = dumper;
}
#region IFixPointInfo<APC,AbstractState> Members
public bool PreStateLookup (APC pc, out AbstractState state)
{
return GetPreState (pc, out state);
}
public bool PostStateLookup (APC pc, out AbstractState state)
{
return GetPostState (pc, out state);
}
#endregion
public static ForwardAnalysis<AbstractState, EdgeData> Make<Source, Dest, Context> (
IILDecoder<APC, Source, Dest, Context, EdgeData> decoder,
IAnalysis<APC, AbstractState, IILVisitor<APC, Source, Dest, AbstractState, AbstractState>, EdgeData> analysis)
where Context : IMethodContextProvider
{
IILVisitor<APC, Source, Dest, AbstractState, AbstractState> visitor = analysis.GetVisitor ();
var forwardAnalysisSolver = new ForwardAnalysis<AbstractState, EdgeData> (
decoder.ContextProvider.MethodContext.CFG,
(pc, state) => decoder.ForwardDecode<AbstractState, AbstractState, IILVisitor<APC, Source, Dest, AbstractState, AbstractState>> (pc, visitor, state),
analysis.Join,
analysis.ImmutableVersion,
analysis.MutableVersion,
analysis.EdgeConversion,
decoder.EdgeData,
(pc, state) => {
if (!decoder.IsUnreachable (pc))
return analysis.IsBottom (pc, state);
return true;
},
analysis.Dump
);
analysis.SaveFixPointInfo (forwardAnalysisSolver);
return forwardAnalysisSolver;
}
protected override void Dump (AbstractState state)
{
this.dumper (new Pair<AbstractState, TextWriter> (state, Console.Out));
}
protected override void PushState (APC from, APC next, AbstractState state)
{
EdgeData data = this.edge_data_getter (from, next);
AbstractState pushState = this.edge_converter (from, next, RequiresJoining (next), data, state);
base.PushState (from, next, pushState);
}
protected override bool Join (Pair<APC, APC> edge, AbstractState newState, AbstractState existingState, out AbstractState joinedState, bool widen)
{
bool weaker;
joinedState = this.joiner (edge, newState, existingState, out weaker, widen);
return weaker;
}
protected override bool IsBottom (APC pc, AbstractState state)
{
return this.is_bottom (pc, state);
}
protected override AbstractState Transfer (APC pc, AbstractState state)
{
AbstractState resultState = this.transfer (pc, state);
return resultState;
}
protected override AbstractState MutableVersion (AbstractState state, APC at)
{
return this.mutable_version (state);
}
protected override AbstractState ImmutableVersion (AbstractState state, APC at)
{
return this.immutable_version (state);
}
}
}
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