[cfe-dev] Objective-C Message Send Generation

[David Chisnall]

Hi Everyone,

I've started working on Objective-C code generation.  The attached  
diff contains my initial work.  I've added a few hooks into the code  
generation code for handling the Objective-C AST nodes.

I've created a CodeGenObjCRuntime abstract class which encapsulates  
the runtime-specific components and a CodeGenObjCGNU concrete subclass  
for the GNU runtime.  Currently, this only handles message sends (and  
assumes an id return type, which needs fixing later).  It's also  
completely unoptimised as yet, and does slightly silly things like  
look up the selector every message send, rather than caching it after  
the first lookup (I'm not sure if this should be done here or if a  
later pass should know that sel_get_uid is a constant function and do  
the caching as an optimisation).

I am trying to keep the CodeGenObjC* classes free from clang-specific  
classes because I intend to use them with a Smalltalk and Self  
compiler (which won't use the clang AST representations) as well.

David

P.S. I've not used C++ for almost five years and not looked at the  
llvm/clang sources before Sunday, so I expect lots of comments.

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