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-boun...@lists.ironpython.com
[mailto:users-boun...@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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