[IronPython] Compiling with Pyc for Silverlight

Michael Foord fuzzyman at voidspace.org.uk
Mon Apr 20 14:51:36 PDT 2009


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.

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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http://www.voidspace.org.uk/blog




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