Bug 6739 - NullReferenceException in ControlFlowGraphBuilder
Summary: NullReferenceException in ControlFlowGraphBuilder
Status: RESOLVED FIXED
Alias: None
Product: Xamarin Studio
Classification: Desktop
Component: C# Binding ()
Version: Trunk
Hardware: PC Mac OS
: Normal normal
Target Milestone: ---
Assignee: Mike Krüger
URL:
Depends on:
Blocks:
 
Reported: 2012-08-29 13:33 UTC by Mikayla Hutchinson [MSFT]
Modified: 2012-09-27 02:47 UTC (History)
1 user (show)

Tags: source-analysis
Is this bug a regression?: ---
Last known good build:

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Status:
RESOLVED FIXED

Description Mikayla Hutchinson [MSFT] 2012-08-29 13:33:56 UTC
ERROR [2012-08-29 13:32:38Z]: CodeAnalysis: Got exception in inspector 'MonoDevelop.CSharp.Refactoring.CodeIssues.NRefactoryIssueProvider'
System.NullReferenceException: Object reference not set to an instance of an object
  at ICSharpCode.NRefactory.CSharp.Analysis.ControlFlowGraphBuilder.CreateStartNode (ICSharpCode.NRefactory.CSharp.Statement statement) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.Analysis.ControlFlowGraphBuilder+NodeCreationVisitor.VisitIfElseStatement (ICSharpCode.NRefactory.CSharp.IfElseStatement ifElseStatement, ICSharpCode.NRefactory.CSharp.Analysis.ControlFlowNode data) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.IfElseStatement.AcceptVisitor[ControlFlowNode,ControlFlowNode] (IAstVisitor`2 visitor, ICSharpCode.NRefactory.CSharp.Analysis.ControlFlowNode data) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.Analysis.ControlFlowGraphBuilder+NodeCreationVisitor.HandleStatementList (ICSharpCode.NRefactory.CSharp.AstNodeCollection`1 statements, ICSharpCode.NRefactory.CSharp.Analysis.ControlFlowNode source) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.Analysis.ControlFlowGraphBuilder+NodeCreationVisitor.VisitBlockStatement (ICSharpCode.NRefactory.CSharp.BlockStatement blockStatement, ICSharpCode.NRefactory.CSharp.Analysis.ControlFlowNode data) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.BlockStatement.AcceptVisitor[ControlFlowNode,ControlFlowNode] (IAstVisitor`2 visitor, ICSharpCode.NRefactory.CSharp.Analysis.ControlFlowNode data) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.Analysis.ControlFlowGraphBuilder.BuildControlFlowGraph (ICSharpCode.NRefactory.CSharp.Statement statement, System.Func`3 resolver, ICSharpCode.NRefactory.CSharp.TypeSystem.CSharpTypeResolveContext typeResolveContext, CancellationToken cancellationToken) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.Analysis.ControlFlowGraphBuilder.BuildControlFlowGraph (ICSharpCode.NRefactory.CSharp.Statement statement, ICSharpCode.NRefactory.CSharp.Resolver.CSharpAstResolver resolver, CancellationToken cancellationToken) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.Analysis.ControlFlowGraphBuilder.BuildControlFlowGraph (ICSharpCode.NRefactory.CSharp.Statement statement, CancellationToken cancellationToken) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.Refactoring.AccessToClosureIssue+GatherVisitor.CollectIssues (ICSharpCode.NRefactory.CSharp.Refactoring.Environment env, System.String variableName) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.Refactoring.AccessToClosureIssue+GatherVisitor.CheckVariable (IVariable variable, ICSharpCode.NRefactory.CSharp.Statement env) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.Refactoring.AccessToClosureIssue+GatherVisitor.VisitVariableInitializer (ICSharpCode.NRefactory.CSharp.VariableInitializer variableInitializer) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.VariableInitializer.AcceptVisitor (IAstVisitor visitor) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.DepthFirstAstVisitor.VisitChildren (ICSharpCode.NRefactory.CSharp.AstNode node) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.GatherVisitorBase.VisitChildren (ICSharpCode.NRefactory.CSharp.AstNode node) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.DepthFirstAstVisitor.VisitVariableDeclarationStatement (ICSharpCode.NRefactory.CSharp.VariableDeclarationStatement variableDeclarationStatement) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.VariableDeclarationStatement.AcceptVisitor (IAstVisitor visitor) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.DepthFirstAstVisitor.VisitChildren (ICSharpCode.NRefactory.CSharp.AstNode node) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.GatherVisitorBase.VisitChildren (ICSharpCode.NRefactory.CSharp.AstNode node) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.DepthFirstAstVisitor.VisitBlockStatement (ICSharpCode.NRefactory.CSharp.BlockStatement blockStatement) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.BlockStatement.AcceptVisitor (IAstVisitor visitor) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.DepthFirstAstVisitor.VisitChildren (ICSharpCode.NRefactory.CSharp.AstNode node) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.GatherVisitorBase.VisitChildren (ICSharpCode.NRefactory.CSharp.AstNode node) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.DepthFirstAstVisitor.VisitConstructorDeclaration (ICSharpCode.NRefactory.CSharp.ConstructorDeclaration constructorDeclaration) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.ConstructorDeclaration.AcceptVisitor (IAstVisitor visitor) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.DepthFirstAstVisitor.VisitChildren (ICSharpCode.NRefactory.CSharp.AstNode node) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.GatherVisitorBase.VisitChildren (ICSharpCode.NRefactory.CSharp.AstNode node) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.DepthFirstAstVisitor.VisitTypeDeclaration (ICSharpCode.NRefactory.CSharp.TypeDeclaration typeDeclaration) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.TypeDeclaration.AcceptVisitor (IAstVisitor visitor) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.DepthFirstAstVisitor.VisitChildren (ICSharpCode.NRefactory.CSharp.AstNode node) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.GatherVisitorBase.VisitChildren (ICSharpCode.NRefactory.CSharp.AstNode node) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.DepthFirstAstVisitor.VisitNamespaceDeclaration (ICSharpCode.NRefactory.CSharp.NamespaceDeclaration namespaceDeclaration) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.NamespaceDeclaration.AcceptVisitor (IAstVisitor visitor) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.DepthFirstAstVisitor.VisitChildren (ICSharpCode.NRefactory.CSharp.AstNode node) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.GatherVisitorBase.VisitChildren (ICSharpCode.NRefactory.CSharp.AstNode node) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.DepthFirstAstVisitor.VisitSyntaxTree (ICSharpCode.NRefactory.CSharp.SyntaxTree syntaxTree) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.SyntaxTree.AcceptVisitor (IAstVisitor visitor) [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.GatherVisitorBase.GetIssues () [0x00000] in <filename unknown>:0 
  at ICSharpCode.NRefactory.CSharp.Refactoring.AccessToClosureIssue.GetIssues (ICSharpCode.NRefactory.CSharp.Refactoring.BaseRefactoringContext context) [0x00000] in <filename unknown>:0 
  at MonoDevelop.CSharp.Refactoring.CodeIssues.NRefactoryIssueProvider+<GetIssues>c__Iterator16.MoveNext () [0x00000] in <filename unknown>:0 
  at MonoDevelop.CodeIssues.CodeAnalysisRunner+<Check>c__AnonStorey25.<>m__39 (MonoDevelop.CodeIssues.CodeIssueProvider provider) [0x00000] in <filename unknown>:0
Comment 1 Mike Krüger 2012-08-30 01:45:47 UTC
fixed.

btw. with which version did you get this - that shouldn't happen in source analysis anymore because the issues don't run on compilation units with errors any longer.

(fixed that case anyways.)
Comment 2 Mikayla Hutchinson [MSFT] 2012-08-31 11:54:56 UTC
I  got this with master from the day I reported it.
Comment 4 Mikayla Hutchinson [MSFT] 2012-09-26 15:46:46 UTC
I still get this, on valid source, when the files are opening as part of opening a solution.
Comment 5 Mike Krüger 2012-09-27 02:47:00 UTC
I fixed a possible null reference exception there. 
When it happens again can you give me a stack trace with line numbers ?