/// <summary>
/// Analize the MoveNext method
/// </summary>
/// <param name="cfg"></param>
/// <param name="pointsToAnalyzer"></param>
/// <param name="protectedNodes"></param>
/// <returns></returns>
DependencyPTGDomain AnalyzeScopeMethod(ControlFlowGraph cfg, IteratorPointsToAnalysis pointsToAnalyzer,
IEnumerable <ProtectedRowNode> protectedNodes)
{
// Before I did Points-to analysis beforehand the dependnecy analysis. Now I compute then together
////var iteratorAnalysis = new IteratorStateAnalysis(cfg, ptgs, this.equalities);
////var result = iteratorAnalysis.Analyze();
//// var dependencyAnalysis = new IteratorDependencyAnalysis(this.moveNextMethod, cfg, ptgs, this.specialFields , this.equalities);
//var nodeEntry = cfg.Entry.Successors.First();
//var nodeExit = cfg.NormalExit;
//nodeExit.NormalSuccessors.Add(nodeEntry);
//nodeEntry.Predecessors.Add(nodeExit);
var rangeAnalysis = new RangeAnalysis(cfg);
var ranges = rangeAnalysis.Analyze();
var exitRange = ranges[cfg.Exit.Id];
var dependencyAnalysis = new IteratorDependencyAnalysis(this.moveNextMethod, cfg, pointsToAnalyzer, protectedNodes, this.equalities, this.interprocManager, rangeAnalysis);
var resultDepAnalysis = dependencyAnalysis.Analyze();
//dependencyAnalysis.SetPreviousResult(resultDepAnalysis);
//resultDepAnalysis = dependencyAnalysis.Analyze();
var node = cfg.Exit;
System.Console.Out.WriteLine("At {0}\nBefore {1}\nAfter {2}\n", node.Id, resultDepAnalysis[node.Id].Input, resultDepAnalysis[node.Id].Output);
this.InputColumns = dependencyAnalysis.InputColumns;
this.OutputColumns = dependencyAnalysis.OutputColumns;
return(resultDepAnalysis[node.Id].Output);
}
public DependencyPTGDomain AnalyzeMoveNextMethod()
{
// 1) Analyze the entry method that creates, populates and return the clousure
var cfgEntry = entryMethod.DoAnalysisPhases(host);
var pointsToEntry = new IteratorPointsToAnalysis(cfgEntry, this.entryMethod); // , this.specialFields);
var entryResult = pointsToEntry.Analyze();
var ptgOfEntry = entryResult[cfgEntry.Exit.Id].Output;
// 2) Call the GetEnumerator that may create a new clousure and polulate it
var myGetEnumResult = new LocalVariable("$_temp_it")
{
Type = getEnumMethod.ReturnType
};
ptgOfEntry.Add(myGetEnumResult);
var ptgAfterEnum = this.interprocManager.PTAInterProcAnalysis(ptgOfEntry, new List <IVariable> {
pointsToEntry.ReturnVariable
}, myGetEnumResult, this.getEnumMethod);
// These are the nodes that we want to protect/analyze
var protectedNodes = ptgOfEntry.Nodes.OfType <ParameterNode>()
.Where(n => IsScopeType(n.Type)).Select(n => new ProtectedRowNode(n, ProtectedRowNode.GetKind(n.Type)));
// I no longer need this.
//var specialFields = cfgEntry.ForwardOrder[1].Instructions.OfType<StoreInstruction>()
// .Where(st => st.Result is InstanceFieldAccess).Select(st => new KeyValuePair<string,IVariable>((st.Result as InstanceFieldAccess).FieldName,st.Operand) );
//this.specialFields = specialFields.ToDictionary(item => item.Key, item => item.Value);
// 3) I bing the current PTG with the parameters of MoveNext method on the clousure
// Well... Inlining is broken we we added the Exceptional control graph. Let's avoid it
//var cfg = this.moveNextMethod.DoAnalysisPhases(host, this.GetMethodsToInline());
var cfg = this.interprocManager.GetCFG(this.moveNextMethod);
PropagateExpressions(cfg, this.equalities);
// In general, the variable to bind is going to be pointsToEntry.ReturnVariable which is aliased with "$_temp_it" (myGetEnumResult)
SimplePointsToGraph calleePTG = InterproceduralManager.PTABindCallerCallee(ptgAfterEnum, new List <IVariable> {
myGetEnumResult
}, this.moveNextMethod);
this.pointsToAnalyzer = new IteratorPointsToAnalysis(cfg, this.moveNextMethod, calleePTG);
//this.pta= this.interprocManager.PTABindAndRunInterProcAnalysis(ptgAfterEnum, new List<IVariable> { myGetEnumResult }, this.moveNextMethod, cfg);
//var pointsTo = new IteratorPointsToAnalysis(cfg, this.moveNextMethod, this.specialFields);
//this.ptAnalysisResult = pointsTo.Analyze();
// var pointsTo = new IteratorPointsToAnalysis(cfg, this.moveNextMethod, this.specialFields, ptgOfEntry);
// Now I analyze the Movenext method with the proper initialization
var result = this.AnalyzeScopeMethod(cfg, pointsToAnalyzer, protectedNodes);
return(result);
}
public IteratorPointsToAnalysis PTABindAndRunInterProcAnalysis(SimplePointsToGraph ptg, IList <IVariable> arguments, MethodDefinition resolvedCallee, ControlFlowGraph calleeCFG)
{
var bindPtg = PTABindCallerCallee(ptg, arguments, resolvedCallee);
// Compute PT analysis for callee
var pta = new IteratorPointsToAnalysis(calleeCFG, resolvedCallee, bindPtg);
pta.Analyze();
return(pta);
}
/// This does the interprocedural analysis.
/// It (currently) does NOT support recursive method invocations
/// </summary>
/// <param name="instruction"></param>
/// <param name="resolvedCallee"></param>
/// <param name="calleeCFG"></param>
public SimplePointsToGraph PTAInterProcAnalysis(SimplePointsToGraph ptg, IList <IVariable> arguments, IVariable result, MethodDefinition resolvedCallee)
{
if (resolvedCallee.Body.Instructions.Any())
{
ControlFlowGraph calleeCFG = this.GetCFG(resolvedCallee);
//DGMLSerializer.Serialize(calleeCFG);
stackDepth++;
IteratorPointsToAnalysis pta = this.PTABindAndRunInterProcAnalysis(ptg, arguments, resolvedCallee, calleeCFG);
stackDepth--;
return(PTABindCaleeCalleer(result, calleeCFG, pta));
}
return(ptg);
}
private SimplePointsToGraph PTABindCaleeCalleer(IVariable result, ControlFlowGraph calleeCFG, IteratorPointsToAnalysis pta)
{
var exitPTG = pta.Result[calleeCFG.Exit.Id].Output;
if (result != null)
{
exitPTG.RestoreFrame(pta.ReturnVariable, result);
}
else
{
exitPTG.RestoreFrame();
}
return(exitPTG);
}
/// This does the interprocedural analysis.
/// It (currently) does NOT support recursive method invocations
/// </summary>
/// <param name="instruction"></param>
/// <param name="resolvedCallee"></param>
/// <param name="calleeCFG"></param>
private InterProceduralReturnInfo InterproceduralAnalysis(InterProceduralCallInfo callInfo, ControlFlowGraph calleeCFG)
{
if (stackDepth > InterproceduralManager.MaxStackDepth)
{
return(new InterProceduralReturnInfo(callInfo.CallerState));
}
stackDepth++;
// I currently do not support recursive calls
// Will add support for this in the near future
if (callStack.Contains(callInfo.Callee))
{
callInfo.CallerState.Dependencies.IsTop = true;
AnalysisStats.AddAnalysisReason(new AnalysisReason(callInfo.Caller, callInfo.Instruction, String.Format(CultureInfo.InvariantCulture, "Recursive call to {0}", callInfo.Callee.Name)));
return(new InterProceduralReturnInfo(callInfo.CallerState));
}
this.callStack.Push(callInfo.Callee);
System.Console.WriteLine("Analyzing Method {0} Stack: {1}", new string(' ', stackDepth * 2) + callInfo.Callee.ToSignatureString(), stackDepth);
// 1) Bind PTG and create a Poinst-to Analysis for the callee. In pta.Result[node.Exit] is the PTG at exit of the callee
var calleePTG = PTABindCallerCallee(callInfo.CallerPTG, callInfo.CallArguments, callInfo.Callee);
IteratorPointsToAnalysis calleePTA = new IteratorPointsToAnalysis(calleeCFG, callInfo.Callee, calleePTG);
IDictionary <IVariable, IExpression> equalities = new Dictionary <IVariable, IExpression>();
SongTaoDependencyAnalysis.PropagateExpressions(calleeCFG, equalities);
var rangesAnalysis = new RangeAnalysis(calleeCFG);
rangesAnalysis.Analyze();
// 2) Bind Parameters of the dependency analysis and run
var calleeDomain = BindCallerCallee(callInfo);
calleeDomain.PTG = calleePTG;
var dependencyAnalysis = new IteratorDependencyAnalysis(callInfo.Callee, calleeCFG, calleePTA, callInfo.ProtectedNodes, equalities, this, rangesAnalysis, calleeDomain, callInfo.ScopeData);
// If we already did the dataflow analysis for this method we recover the dataflow state
// This should be adapted (or removed) if we want the analysis to be context sensitive
//if (dataflowCache.ContainsKey(callInfo.Callee))
//{
// var previosResult = dataflowCache[callInfo.Callee];
// //DataFlowAnalysisResult<DependencyPTGDomain>[] resultsCopy = new DataFlowAnalysisResult<DependencyPTGDomain>[previosResult.Length];
// //for(int i=0; i< previosResult.Length; i++)
// //{
// // resultsCopy[i] = new DataFlowAnalysisResult<DependencyPTGDomain>();
// // resultsCopy[i].Input = previosResult[i].Input!=null? previosResult[i].Input.Clone(): null;
// // resultsCopy[i].Output = previosResult[i].Output!=null? previosResult[i].Output.Clone(): null;
// //}
// //dependencyAnalysis.SetPreviousResult(resultsCopy);
// dependencyAnalysis.SetPreviousResult(previosResult);
//}
dependencyAnalysis.Analyze();
this.dataflowCache[callInfo.Callee] = dependencyAnalysis.Result;
stackDepth--;
this.callStack.Pop();
// 3) Bind callee with caller
// Should I need the PTG of caller and callee?
//var exitCalleePTG = calleePTA.Result[calleeCFG.Exit.Id].Output;
var exitCalleePTG = dependencyAnalysis.Result[calleeCFG.Exit.Id].Output.PTG;
var exitResult = BindCalleeCaller(callInfo, calleeCFG, dependencyAnalysis);
// Recover the frame of the original Ptg and bind ptg results
//PointsToGraph bindPtg = PTABindCaleeCalleer(callInfo.CallLHS, calleeCFG, calleePTA);
var bindPtg = PTABindCaleeCalleer(callInfo.CallLHS, calleeCFG, exitCalleePTG, calleePTA.ReturnVariable);
exitResult.PTG = bindPtg;
return(new InterProceduralReturnInfo(exitResult));
//return new InterProceduralReturnInfo(exitResult, bindPtg);
}
