dynamic-language-runtime

What are some resources for making a CLR/.NET language debuggable? I'm developing an ActionScript 3 to IL compiler, which uses DLR CallSites and CallSiteBinders to handle the dynamic aspects of the otherwise static programming language. I'm looking for any information on making the emitted IL map back to the source code, and I'd also like to know how I can make the dynamic call sites map back as well. So this is ultimately two questions: How can I make the IL debuggable? How can I make the DLR call sites debuggable? Any help would be greatly appreciated! What I'm looking for in terms of

I'm looking for a way to add members dynamically to an dynamic object. OK, I guess a little clarification is needed... When you do that : dynamic foo = new ExpandoObject(); foo.Bar = 42; The Bar property will be added dynamically at runtime. But the code still refers "statically" to Bar (the name "Bar" is hard-coded)... What if I want to add a property at runtime without knowing its name at compile time ? I know how to do this with a custom dynamic object (I actually blogged about it a few months ago), using the methods of the DynamicObject class, but how can I do it with any dynamic object ?

I am planning to use dynamic keyword for my new project. But before stepping in, I would like to know about the pros and cons in using dynamic keyword over Reflection. Following where the pros, I could find in respect to dynamic keyword: Readable\Maintainable code. Fewer lines of code. While the negatives associated with using dynamic keyword, I came to hear was like: Affects application performance. Dynamic keyword is internally a wrapper of Reflection. Dynamic typing might turn into breeding ground for hard to find bugs. Affects interoperability with previous .NET versions. Please help me on