[IronPython] Silverlight - Cannot save value from target back to source

Lukas Cenovsky cenovsky at bakalari.cz
Thu Sep 9 21:55:33 CEST 2010 

  I've filled an issue for this bug: 
http://ironpython.codeplex.com/workitem/28823

--
-- Lukáš


On 3.9.2010 19:39, Lukas Cenovsky wrote:
> I do not have any Mountains.filtered.set method - I think clrtype 
> metaclass adds it. You can see the part I wrote (filtered property) 
> below or in the attachment where I put the whole testing sources.
>
> Running the same code in the desktop CLR works fine (wpf.py).
>
> --
> -- Lukáš
>
>
> On 3.9.2010 19:11, Dino Viehland wrote:
>>
>> Does this only happen in debug mode?  Do you have a class or a method 
>> named like Mountains.filtered.set (in other words do you have any 
>> idea of what this code is)?   Or are you maybe deriving from a class 
>> named Mountains which has a set method?
>>
>> Ultimately what I'm getting at is it'd be good to run this on the 
>> desktop CLR and get the same method created.  So if you can isolate 
>> the code then run it on the desktop you could run w/ the 
>> --X:SaveAssemblies option.  That will write out the IL we generate to 
>> disk as a Snippets.scripting.dll and then you can run peverify on 
>> that and see if the generated code is actually unverifiable (or if 
>> maybe there's a CLR bug related to verification).
>>
>> If there is actually unverifiable code then we have a bug we need to 
>> fix.  If we have verifiable code or some difference between when 
>> we're using RefEmit and DynamicMethods then maybe the CLR has a bug 
>> that needs to be fixed.
>>
>> *From:* users-bounces at lists.ironpython.com 
>> [mailto:users-bounces at lists.ironpython.com] *On Behalf Of *Lukas Cenovsky
>> *Sent:* Friday, September 03, 2010 9:04 AM
>> *To:* Discussion of IronPython
>> *Subject:* Re: [IronPython] Silverlight - Cannot save value from 
>> target back to source
>>
>> I am trying to debug this bug and I need some help.
>>
>> I have built IronPython 2.6.1 - Silverlight debug binaries. I have 
>> pointed VS 2010 symbols folder to the folder with these binaries.
>>
>> I run the Silverlight app in the debug mode (debug=true in 
>> index.html), attach VS 2010 debugger, select Thrown for /Common 
>> Language Runtime Exceptions/ and /Managed Debugging Assistants/ in 
>> Debug - Exceptions dialog.
>>
>> All symbols are loaded, so I click on the checkbox button on the 
>> page. The following exception occurs:
>>
>> System.Security.VerificationException occurred
>>   Message=Operation could destabilize the runtime.
>>   StackTrace:
>>        at Mountains.filtered(Nullable`1 value)
>>   InnerException:
>>
>> No source available.This is the Call stack:
>>
>> >    Snippets.scripting!Mountains.filtered.set(bool? value) + 0x23 bytes
>>      [Native to Managed Transition]
>>      [Managed to Native Transition]
>>      
>> System.Windows.dll!System.Windows.CLRPropertyListener.Value.set(object value) 
>> + 0x23 bytes
>>      
>> System.Windows.dll!System.Windows.PropertyAccessPathStep.Value.set(object 
>> value) + 0x10 bytes
>>      
>> System.Windows.dll!System.Windows.Data.BindingExpression.UpdateValue() + 
>> 0x3b2 bytes
>>      
>> System.Windows.dll!System.Windows.Data.BindingExpression.UpdateValueIfNecessary() 
>> + 0x27 bytes
>>      
>> System.Windows.dll!System.Windows.Data.BindingExpression.TargetPropertyChanged(System.Windows.DependencyObject 
>> sender, System.Windows.DependencyProperty dp) + 0x2b bytes
>>      
>> System.Windows.dll!System.Windows.DependencyObject.OnPropertyChanged(System.Windows.DependencyProperty 
>> dp) + 0x17 bytes
>>      
>> System.Windows.dll!System.Windows.FrameworkElement.OnPropertyChanged(System.Windows.DependencyProperty 
>> dp) + 0x51 bytes
>>      
>> System.Windows.dll!System.Windows.DependencyObject.RaisePropertyChangeNotifications(System.Windows.DependencyProperty 
>> dp, object oldValue, object newValue) + 0x5c bytes
>>      
>> System.Windows.dll!System.Windows.DependencyObject.UpdateEffectiveValue(System.Windows.DependencyProperty 
>> property, System.Windows.EffectiveValueEntry oldEntry, ref 
>> System.Windows.EffectiveValueEntry newEntry, 
>> System.Windows.DependencyObject.ValueOperation operation) + 0xf6 bytes
>>      
>> System.Windows.dll!System.Windows.DependencyObject.SetValueInternal(System.Windows.DependencyProperty 
>> dp, object value, bool allowReadOnlySet) + 0x1da bytes
>>      
>> System.Windows.dll!System.Windows.Controls.Primitives.ToggleButton.OnToggle() 
>> + 0x8d bytes
>>      
>> System.Windows.dll!System.Windows.Controls.Primitives.ToggleButton.OnClick() 
>> + 0xf bytes
>>      
>> System.Windows.dll!System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(System.Windows.Input.MouseButtonEventArgs 
>> e) + 0x8e bytes
>>      
>> System.Windows.dll!System.Windows.Controls.Control.OnMouseLeftButtonUp(System.Windows.Controls.Control 
>> ctrl, System.EventArgs e) + 0x31 bytes
>>      
>> System.Windows.dll!MS.Internal.JoltHelper.FireEvent(System.IntPtr 
>> unmanagedObj, System.IntPtr unmanagedObjArgs, int argsTypeIndex, 
>> string eventName) + 0x234 bytes
>>      [Appdomain Transition]
>>
>> I click Step Into and another exception occurs:
>>
>> System.Reflection.TargetInvocationException occurred
>>   Message=Exception has been thrown by the target of an invocation.
>>   StackTrace:
>>        at 
>> System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo 
>> method, Object target, Object[] arguments, SignatureStruct& sig, 
>> MethodAttributes methodAttributes, RuntimeType typeOwner)
>>        at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, 
>> BindingFlags invokeAttr, Binder binder, Object[] parameters, 
>> CultureInfo culture, Boolean skipVisibilityChecks)
>>   InnerException: System.TypeInitializationException
>>        Message=The type initializer for 
>> 'Microsoft.VisualStudio.DebuggerVisualizers.DebugViewerShim.DebugeeHost' 
>> threw an exception.
>>        
>> TypeName=Microsoft.VisualStudio.DebuggerVisualizers.DebugViewerShim.DebugeeHost
>>        InnerException: System.TypeLoadException
>>             Message=Could not load type 'System.MarshalByRefObject' 
>> from assembly 'mscorlib, Version=2.0.5.0, Culture=neutral, 
>> PublicKeyToken=7cec85d7bea7798e'.
>>             StackTrace:
>>                  at 
>> Microsoft.VisualStudio.DebuggerVisualizers.DebugViewerShim.DebugeeHost..cctor()
>>             InnerException:
>>
>> Stepping further shows the System.Windows.Data error I posted below.
>>
>> Any ideas/hints? Thank you.
>>
>> --
>> -- Lukáš
>>
>>
>> On 2.9.2010 20:39, Lukas Cenovsky wrote:
>>
>>  Following my binding experiments in WPF, I tried to convert the 
>> sample into Silverlight and I hit another binding errors there.
>>
>> When I bind anything else than string, I receive an error when the 
>> target value is changed and the source should be updated. This 
>> happens in all IronPython versions (2.6.1 on .Net 2.0 and 4, 2.7a1).
>>
>> Here is the code I use (the whole source is attached):
>>
>>     @property
>>     @clrtype.accepts()
>>     @clrtype.returns(System.Nullable[System.Boolean])
>>     def filtered(self):
>>         return self._filtered
>>
>>     @filtered.setter
>>     @clrtype.accepts(System.Nullable[System.Boolean])
>>     @clrtype.returns()
>>     def filtered(self, value):
>>         self._filtered = value
>>         self.OnPropertyChanged('filtered')
>>
>> As you can see I tried to use System.Nullable[System.Boolean] instead 
>> of bool but it did not help. I also tried to use converter and 
>> convert the value to this type 
>> (System.Nullable[System.Boolean](value)) but that did not help 
>> either. All resulted in the following exception for bool type.
>>
>> System.Windows.Data Error: Cannot save value from target back to 
>> source. BindingExpression: Path='filtered' DataItem='Mountains' 
>> (HashCode=2058916); target element is 
>> 'System.Windows.Controls.CheckBox' (Name=''); target property is 
>> 'IsChecked' (type 'System.Nullable`1[System.Boolean]').. 
>> System.Reflection.TargetInvocationException: Exception has been 
>> thrown by the target of an invocation. ---> 
>> System.Security.VerificationException: Operation could destabilize 
>> the runtime.
>>    at Mountains.filtered(Nullable`1 value)
>>    --- End of inner exception stack trace ---
>>    at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo 
>> method, Object target, Object[] arguments, SignatureStruct& sig, 
>> MethodAttributes methodAttributes, RuntimeType typeOwner)
>>    at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, 
>> BindingFlags invokeAttr, Binder binder, Object[] parameters, 
>> CultureInfo culture, Boolean skipVisibilityChecks)
>>    at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, 
>> BindingFlags invokeAttr, Binder binder, Object[] parameters, 
>> CultureInfo culture)
>>    at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, 
>> Object value, BindingFlags invokeAttr, Binder binder, Object[] index, 
>> CultureInfo culture)
>>    at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, 
>> Object value, Object[] index)
>>    at System.Windows.CLRPropertyListener.set_Value(Object value)
>>    at System.Windows.PropertyAccessPathStep.set_Value(Object value)
>>    at System.Windows.Data.BindingExpression.UpdateValue().
>>
>> The similar exception is raised for float or System.Double.
>>
>> I have found an old issue similar to this: 
>> http://ironpython.codeplex.com/workitem/16831?ProjectName=ironpython
>>
>> Any workaround would be nice for this bug :-)
>>
>> -- 
>> -- Lukáš
>>
>>   
>>   
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