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//
// ExpressionDecoder.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.AST.Visitors;
using Mono.CodeContracts.Static.Analysis.ExpressionAnalysis.Expressions;
using Mono.CodeContracts.Static.Analysis.HeapAnalysis;
using Mono.CodeContracts.Static.ControlFlow;
using Mono.CodeContracts.Static.DataStructures;
using Mono.CodeContracts.Static.Lattices;
using Mono.CodeContracts.Static.Providers;
namespace Mono.CodeContracts.Static.Analysis.ExpressionAnalysis {
class ExpressionDecoder<TSymbolicValue, TContext, TEdgeData> :
IILDecoder<APC, LabeledSymbol<APC, TSymbolicValue>, TSymbolicValue, IExpressionContextProvider<LabeledSymbol<APC, TSymbolicValue>, TSymbolicValue>, TEdgeData>,
IExpressionContextProvider<LabeledSymbol<APC, TSymbolicValue>, TSymbolicValue>,
IExpressionContext<LabeledSymbol<APC, TSymbolicValue>, TSymbolicValue>
where TSymbolicValue : IEquatable<TSymbolicValue>
where TContext : IValueContextProvider<TSymbolicValue>
where TEdgeData : IImmutableMap<TSymbolicValue, Sequence<TSymbolicValue>> {
private readonly IILDecoder<APC, TSymbolicValue, TSymbolicValue, IValueContextProvider<TSymbolicValue>, TEdgeData> value_decoder;
private readonly ExpressionAnalysisFacade<TSymbolicValue, TContext, TEdgeData> parent;
private readonly IValueContextProvider<TSymbolicValue> underlying;
public ExpressionDecoder (IILDecoder<APC, TSymbolicValue, TSymbolicValue, IValueContextProvider<TSymbolicValue>, TEdgeData> valueDecoder,
ExpressionAnalysisFacade<TSymbolicValue, TContext, TEdgeData> parent)
{
this.value_decoder = valueDecoder;
this.parent = parent;
this.underlying = valueDecoder.ContextProvider;
}
#region IExpressionContext<LabeledSymbol<APC,SymbolicValue>,SymbolicValue> Members
public LabeledSymbol<APC, TSymbolicValue> Refine (APC pc, TSymbolicValue variable)
{
return new LabeledSymbol<APC, TSymbolicValue> (pc, variable);
}
public TSymbolicValue Unrefine (LabeledSymbol<APC, TSymbolicValue> expression)
{
return expression.Symbol;
}
public Result Decode<Data, Result, Visitor> (LabeledSymbol<APC, TSymbolicValue> expr, Visitor visitor, Data data)
where Visitor : ISymbolicExpressionVisitor<LabeledSymbol<APC, TSymbolicValue>, LabeledSymbol<APC, TSymbolicValue>, TSymbolicValue, Data, Result>
{
ExprDomain<TSymbolicValue> ifFound;
if (!this.parent.PreStateLookup (expr.ReadAt, out ifFound) || ifFound.IsBottom)
return visitor.SymbolicConstant (expr, expr.Symbol, data);
FlatDomain<Expr<TSymbolicValue>> aExpr = ifFound [expr.Symbol];
if (aExpr.IsNormal()) {
return aExpr.Value.Decode<Data, Result, ExpressionDecoderAdapter<TSymbolicValue, Data, Result, Visitor>>
(expr.ReadAt, expr.Symbol, new ExpressionDecoderAdapter<TSymbolicValue, Data, Result, Visitor> (visitor), data);
}
TypeNode type;
object constant;
if (this.parent.ValueLayer.ILDecoder.ContextProvider.ValueContext.IsConstant (expr.ReadAt, expr.Symbol, out type, out constant))
return visitor.LoadConst (expr, type, constant, expr.Symbol, data);
return visitor.SymbolicConstant (expr, expr.Symbol, data);
}
public FlatDomain<TypeNode> GetType (LabeledSymbol<APC, TSymbolicValue> expr)
{
return this.underlying.ValueContext.GetType (expr.ReadAt, expr.Symbol);
}
public APC GetPC (LabeledSymbol<APC, TSymbolicValue> pc)
{
return pc.ReadAt;
}
public LabeledSymbol<APC, TSymbolicValue> For (TSymbolicValue variable)
{
return new LabeledSymbol<APC, TSymbolicValue> (MethodContext.CFG.Entry, variable);
}
public bool IsZero (LabeledSymbol<APC, TSymbolicValue> expression)
{
return ValueContext.IsZero (expression.ReadAt, expression.Symbol);
}
#endregion
#region IILDecoder<APC,LabeledSymbol<APC,SymbolicValue>,SymbolicValue,IExpressionContextProvider<LabeledSymbol<APC,SymbolicValue>,SymbolicValue>,EdgeData> Members
public IExpressionContextProvider<LabeledSymbol<APC, TSymbolicValue>, TSymbolicValue> ContextProvider
{
get { return this; }
}
public Result ForwardDecode<Data, Result, Visitor> (APC pc, Visitor visitor, Data state)
where Visitor : IILVisitor<APC, LabeledSymbol<APC, TSymbolicValue>, TSymbolicValue, Data, Result>
{
return this.value_decoder.ForwardDecode<Data, Result, ILDecoderAdapter<TSymbolicValue, Data, Result, Visitor>>
(pc, new ILDecoderAdapter<TSymbolicValue, Data, Result, Visitor> (visitor), state);
}
public bool IsUnreachable (APC pc)
{
return this.parent.IsUnreachable (pc);
}
public TEdgeData EdgeData (APC from, APC to)
{
return this.parent.ValueLayer.ILDecoder.EdgeData (from, to);
}
#endregion
#region Implementation of IMethodContextProvider<Field,Method>
public IMethodContext MethodContext
{
get { return this.underlying.MethodContext; }
}
#endregion
#region Implementation of IStackContextProvider<Field,Method>
public IStackContext StackContext
{
get { return this.underlying.StackContext; }
}
#endregion
#region Implementation of IValueContextProvider<Local,Parameter,Method,Field,Type,SymbolicValue>
public IValueContext<TSymbolicValue> ValueContext
{
get { return this.underlying.ValueContext; }
}
#endregion
#region Implementation of IExpressionContextProvider<Local,Parameter,Method,Field,Type,ExternalExpression<APC,SymbolicValue>,SymbolicValue>
public IExpressionContext<LabeledSymbol<APC, TSymbolicValue>, TSymbolicValue> ExpressionContext
{
get { return this; }
}
#endregion
}
}
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