[IronPython] Compiling with Pyc for Silverlight

Michael Foord fuzzyman at voidspace.org.uk
Tue Apr 21 00:06:58 CEST 2009

Michael Foord wrote:
> Jb Evain wrote:
>> Hey Michael,
>> On 4/20/09, Michael Foord <fuzzyman at voidspace.org.uk> wrote:
>>>  I guess a full IL writer would be needed - which means back to 
>>> Cecil and
>>> the like and seeing if parts of them could be run on Silverlight. 
>>> *sigh*
>> You just want to change the references to an assembly from the desktop
>> version to the SL version? With Cecil it's like:
>> var assembly = AssemblyFactory.GetAssembly (file);
>> foreach (var reference in assembly.MainModule.AssemblyReferences) {
>>     if (!IsTargetAssembly (reference))
>>         continue;
>>     reference.Version = new Version (2, 0, 5, 0);
>> }
>> AssemblyFactory.SaveAssembly (assembly, file);
>> Now it doesn't guarantee that the resulting assembly is coherent,
>> visibility wise, as you may have used methods that are not visible or
>> not existent in SL.
> Thanks for that - if it would work it would be really useful, however...
> I think I've done the equivalent of this using ildasm / ilasm. I've 
> disassembled the assembly to IL, then replaced the references with the 
> references to Silverlight assemblies and re-assembled.
> The resulting assembly throws exactly the same error - which makes me 
> think that the assemblies compiled by Pyc are using things that aren't 
> available in Silverlight. *However* - 
> Microsoft.Runtime.CompilerServices.StrongBox does exist in 
> Silverlight. I think I'll try the whole process again just to see. My 
> guess is that rewriting would require an intimate knowledge of the 
> differences between the CoreCLR and standard .NET.

No - I've rerun the whole process from compiling with Pyc through to 
replacing the references in the il and reassembling. Same error. Shame.

SystemError: Could not load type 
'Microsoft.Runtime.CompilerServices.StrongBox`1' from assembly 
'Microsoft.Scripting.Core, Version=, Culture=neutral, 

Michael Foord

> I can't import it in a Silverlight application though (the following 
> code does work on the desktop version of IronPython):
> import clr
> clr.AddReference('Microsoft.Scripting')
> clr.AddReference('Microsoft.Scripting.Core')
> from  Microsoft.Runtime.CompilerServices import StrongBox
> ImportError: No module named Runtime
> Michael


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