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//
// ControlFlowGraph.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.Collections.Generic;
using System.IO;
using Mono.CodeContracts.Static.AST;
using Mono.CodeContracts.Static.Analysis;
using Mono.CodeContracts.Static.ControlFlow.Subroutines;
using Mono.CodeContracts.Static.DataStructures;
using Mono.CodeContracts.Static.Providers;
namespace Mono.CodeContracts.Static.ControlFlow {
class ControlFlowGraph : ICFG {
readonly SubroutineFacade method_repository;
readonly Subroutine method_subroutine;
public ControlFlowGraph (Subroutine subroutine, SubroutineFacade methodRepository)
{
this.method_subroutine = subroutine;
this.method_repository = methodRepository;
}
CFGBlock EntryBlock { get { return this.method_subroutine.Entry; } }
CFGBlock ExitBlock { get { return this.method_subroutine.Exit; } }
CFGBlock ExceptionExitBlock { get { return this.method_subroutine.ExceptionExit; } }
public Method CFGMethod
{
get
{
var methodInfo = this.method_subroutine as IMethodInfo;
if (methodInfo != null)
return methodInfo.Method;
throw new InvalidOperationException ("CFG has bad subroutine that is not a method");
}
}
#region ICFG Members
public APC Entry { get { return new APC (this.EntryBlock, 0, null); } }
public APC EntryAfterRequires { get { return new APC (this.method_subroutine.EntryAfterRequires, 0, null); } }
public APC NormalExit { get { return new APC (this.ExitBlock, 0, null); } }
public APC ExceptionExit { get { return new APC (this.ExceptionExitBlock, 0, null); } }
public Subroutine Subroutine { get { return this.method_subroutine; } }
public APC Next (APC pc)
{
APC next;
if (this.HasSingleSuccessor (pc, out next))
return next;
return pc;
}
public bool HasSingleSuccessor (APC pc, out APC ifFound)
{
return pc.Block.Subroutine.HasSingleSuccessor (pc, out ifFound);
}
public IEnumerable<APC> Successors (APC pc)
{
return pc.Block.Subroutine.Successors (pc);
}
public bool HasSinglePredecessor (APC pc, out APC ifFound)
{
return pc.Block.Subroutine.HasSinglePredecessor (pc, out ifFound);
}
public IEnumerable<APC> Predecessors (APC pc)
{
return pc.Block.Subroutine.Predecessors (pc);
}
public bool IsJoinPoint (APC pc)
{
if (pc.Index != 0)
return false;
return IsJoinPoint (pc.Block);
}
public bool IsSplitPoint (APC pc)
{
if (pc.Index != pc.Block.Count)
return false;
return IsSplitPoint (pc.Block);
}
public bool IsBlockStart (APC pc)
{
return pc.Index == 0;
}
public bool IsBlockEnd (APC pc)
{
return pc.Index == pc.Block.Count;
}
public IILDecoder<APC, Dummy, Dummy, IMethodContextProvider, Dummy> GetDecoder (
IMetaDataProvider metaDataProvider)
{
return new APCDecoder (this, metaDataProvider, this.method_repository);
}
public void Print (TextWriter tw, ILPrinter<APC> printer,
Func<CFGBlock, IEnumerable<Sequence<Edge<CFGBlock, EdgeTag>>>> contextLookup,
Sequence<Edge<CFGBlock, EdgeTag>> context)
{
var set = new HashSet<Pair<Subroutine, Sequence<Edge<CFGBlock, EdgeTag>>>> ();
this.method_subroutine.Print (tw, printer, contextLookup, context, set);
}
public bool IsForwardBackEdge (APC @from, APC to)
{
if (to.Index != 0)
return false;
return this.IsForwardBackEdgeHelper (from, to);
}
public APC Post (APC pc)
{
APC next;
return this.HasSingleSuccessor (pc, out next) ? next : pc;
}
#endregion
bool IsForwardBackEdgeHelper (APC @from, APC to)
{
if (to.Block.Subroutine.EdgeInfo.IsBackEdge (from.Block, Dummy.Value, to.Block))
return true;
if (from.SubroutineContext.IsEmpty () || from.SubroutineContext.Tail != to.SubroutineContext)
return false;
Edge<CFGBlock, EdgeTag> edge = @from.SubroutineContext.Head;
return edge.To.Subroutine.EdgeInfo.IsBackEdge (edge.From, Dummy.Value, edge.To);
}
bool IsJoinPoint (CFGBlock block)
{
return block.Subroutine.IsJoinPoint (block);
}
bool IsSplitPoint (CFGBlock block)
{
return block.Subroutine.IsSplitPoint (block);
}
public IGraph<APC, Dummy> AsForwardGraph ()
{
return new GraphWrapper<APC, Dummy> (new APC[0], (pc) => this.SuccessorsEdges (pc));
}
IEnumerable<Pair<Dummy, APC>> SuccessorsEdges (APC pc)
{
APC last = pc.LastInBlock ();
foreach (APC succ in this.Successors (last))
yield return new Pair<Dummy, APC> (Dummy.Value, succ);
}
}
}
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