Bug 1539 - NRE in watch window
Summary: NRE in watch window
Alias: None
Product: Xamarin Studio
Classification: Desktop
Component: Debugger ()
Version: Trunk
Hardware: PC Linux
: High normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2011-10-17 17:39 UTC by Marek Safar
Modified: 2011-12-29 04:35 UTC (History)
3 users (show)

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

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Description Marek Safar 2011-10-17 17:39:42 UTC
System.NullReferenceException: Object reference not set to an instance of an object
  at Mono.Debugging.Soft.SoftDebuggerAdaptor.GetIndexerReference (Mono.Debugging.Evaluation.EvaluationContext ctx, System.Object target, System.Object[] indices) [0x000e0] in /home/marek/git/monodevelop/main/src/addins/MonoDevelop.Debugger.Soft/Mono.Debugging.Soft/SoftDebuggerAdaptor.cs:247 
  at Mono.Debugging.Evaluation.EvaluatorVisitor.VisitIndexerExpression (ICSharpCode.OldNRefactory.Ast.IndexerExpression indexerExpression, System.Object data) [0x00102] in /home/marek/git/monodevelop/main/src/core/Mono.Debugging/Mono.Debugging.Evaluation/NRefactoryEvaluator.cs:513 
  at ICSharpCode.OldNRefactory.Ast.IndexerExpression.AcceptVisitor (IAstVisitor visitor, System.Object data) [0x00000] in /home/marek/git/monodevelop/main/contrib/NRefactory/Project/Src/Ast/Generated.cs:2556 
  at Mono.Debugging.Evaluation.EvaluatorVisitor.VisitMemberReferenceExpression (ICSharpCode.OldNRefactory.Ast.MemberReferenceExpression memberReferenceExpression, System.Object data) [0x00000] in /home/marek/git/monodevelop/main/src/core/Mono.Debugging/Mono.Debugging.Evaluation/NRefactoryEvaluator.cs:594 
  at ICSharpCode.OldNRefactory.Ast.MemberReferenceExpression.AcceptVisitor (IAstVisitor visitor, System.Object data) [0x00000] in /home/marek/git/monodevelop/main/contrib/NRefactory/Project/Src/Ast/Generated.cs:2840 
  at Mono.Debugging.Evaluation.NRefactoryEvaluator.Evaluate (Mono.Debugging.Evaluation.EvaluationContext ctx, System.String exp, System.Object expectedType, Boolean tryTypeOf) [0x00164] in /home/marek/git/monodevelop/main/src/core/Mono.Debugging/Mono.Debugging.Evaluation/NRefactoryEvaluator.cs:89 aaaa
Comment 1 Jeffrey Stedfast 2011-11-28 17:37:18 UTC
Is there a way to reproduce this?
Comment 2 Jeffrey Stedfast 2011-12-05 11:55:37 UTC
Do you have any idea what the expression in the watch window looked like?
Comment 3 Marek Safar 2011-12-05 12:57:24 UTC
It has been some time ago but from the stack trace I can see it was indexer expression
Comment 4 Jeffrey Stedfast 2011-12-08 14:39:39 UTC
I imagine that this trace indicates that targetType is null in SoftDebuggerAdaptor.GetIndexerReference()

No idea how that could happen though.
Comment 5 Jeffrey Stedfast 2011-12-08 15:48:07 UTC
I need a test case for this in order to fix it
Comment 6 Marek Safar 2011-12-08 18:43:47 UTC
Closing, will try to report it with full custom mono build next time ;-)
Comment 7 Jeffrey Stedfast 2011-12-08 19:32:40 UTC
Well, maybe Lluis could take a look and see something that a newb like me didn't see ;-)
Comment 8 Atin 2011-12-29 04:35:11 UTC
Please provide some necessary info or step to reproduce this bug.