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//
// ValueAnalysis.cs
//
// Authors:
// Alexander Chebaturkin (chebaturkin@gmail.com)
//
// Copyright (C) 2012 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.ExpressionAnalysis.Expressions;
using Mono.CodeContracts.Static.ControlFlow;
using Mono.CodeContracts.Static.DataFlowAnalysis;
using Mono.CodeContracts.Static.DataStructures;
using Mono.CodeContracts.Static.Lattices;
namespace Mono.CodeContracts.Static.Analysis.ExpressionAnalysis {
class ValueAnalysis<SymbolicValue, Context, EdgeData> : IAnalysis<APC, ExprDomain<SymbolicValue>,
IILVisitor<APC, SymbolicValue, SymbolicValue, ExprDomain<SymbolicValue>, ExprDomain<SymbolicValue>>, EdgeData>
where SymbolicValue : IEquatable<SymbolicValue>
where Context : IValueContextProvider<SymbolicValue>
where EdgeData : IImmutableMap<SymbolicValue, Sequence<SymbolicValue>> {
private readonly ExpressionAnalysisFacade<SymbolicValue, Context, EdgeData> parent;
public ValueAnalysis (ExpressionAnalysisFacade<SymbolicValue, Context, EdgeData> parent)
{
this.parent = parent;
}
#region Implementation of IAnalysis<APC,ExpressionAnalysis<Local,Parameter,Method,Field,Property,Event,Type,Attribute,Assembly,SymbolicValue,contextProvider,EdgeData>.Domain,IILVisitor<APC,Local,Parameter,Method,Field,Type,SymbolicValue,SymbolicValue,ExpressionAnalysis<Local,Parameter,Method,Field,Property,Event,Type,Attribute,Assembly,SymbolicValue,contextProvider,EdgeData>.Domain,ExpressionAnalysis<Local,Parameter,Method,Field,Property,Event,Type,Attribute,Assembly,SymbolicValue,contextProvider,EdgeData>.Domain>,EdgeData>
public ExprDomain<SymbolicValue> EdgeConversion (APC @from, APC to, bool isJoinPoint, EdgeData sourceTargetMap, ExprDomain<SymbolicValue> originalState)
{
if (sourceTargetMap == null)
return originalState;
if (DebugOptions.Debug)
{
Console.WriteLine ("====Expression analysis Parallel assign====");
DumpMap (sourceTargetMap);
DumpExpressions ("original expressions", originalState);
}
ExprDomain<SymbolicValue> result = originalState.Empty ();
ExprDomain<SymbolicValue> domain = originalState.Empty ();
foreach (SymbolicValue sv in originalState.Keys) {
Expr<SymbolicValue> expression = originalState [sv].Value.Substitute (sourceTargetMap);
if (expression != null)
domain = domain.Add (sv, expression);
}
foreach (SymbolicValue sv in sourceTargetMap.Keys) {
FlatDomain<Expr<SymbolicValue>> expressionDomain = domain [sv];
if (expressionDomain.IsNormal()) {
Expr<SymbolicValue> expression = expressionDomain.Value;
foreach (SymbolicValue sub in sourceTargetMap [sv].AsEnumerable ())
result = result.Add (sub, expression);
}
}
if (DebugOptions.Debug)
{
DumpExpressions ("new expressions", result);
}
return result;
}
public IILVisitor<APC, SymbolicValue, SymbolicValue, ExprDomain<SymbolicValue>, ExprDomain<SymbolicValue>> GetVisitor ()
{
return new AnalysisDecoder<SymbolicValue> ();
}
public ExprDomain<SymbolicValue> Join (Pair<APC, APC> edge, ExprDomain<SymbolicValue> newstate, ExprDomain<SymbolicValue> prevstate, out bool weaker, bool widen)
{
return prevstate.Join (newstate, widen, out weaker);
}
public ExprDomain<SymbolicValue> ImmutableVersion (ExprDomain<SymbolicValue> arg)
{
return arg;
}
public ExprDomain<SymbolicValue> MutableVersion (ExprDomain<SymbolicValue> arg)
{
return arg;
}
public bool IsBottom (APC pc, ExprDomain<SymbolicValue> state)
{
return state.IsBottom;
}
public Predicate<APC> SaveFixPointInfo (IFixPointInfo<APC, ExprDomain<SymbolicValue>> fixPointInfo)
{
this.parent.SaveFixPointInfo (fixPointInfo);
return pc => true;
}
public void Dump (Pair<ExprDomain<SymbolicValue>, TextWriter> pair)
{
pair.Key.Dump (pair.Value);
}
private void DumpMap (IImmutableMap<SymbolicValue, Sequence<SymbolicValue>> sourceTargetMap)
{
Console.WriteLine ("Source-Target assignment");
foreach (SymbolicValue key in sourceTargetMap.Keys) {
foreach (SymbolicValue value in sourceTargetMap [key].AsEnumerable ())
Console.Write ("{0} ", value);
Console.WriteLine (" := {0}", key);
}
}
private void DumpExpressions (string header, ExprDomain<SymbolicValue> state)
{
Console.WriteLine ("--- {0} ---", header);
foreach (SymbolicValue index in state.Keys) {
FlatDomain<Expr<SymbolicValue>> domain = state [index];
if (domain.IsNormal())
Console.WriteLine ("{0} -> {1}", index, domain.Value);
else if (domain.IsTop)
Console.WriteLine ("{0} -> (Top)", index);
else if (domain.IsBottom)
Console.WriteLine ("{0} -> (Bot)", index);
}
}
#endregion
}
}
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