[cfe-dev] Getting the type of a Selector

[David Chisnall]

Hi,

Since the Objecgtive-C runtime interface has now been changed to not  
pass the type information along with the selector, can someone suggest  
the best way of attaining it?  The only case when it's really  
important is when generating a message send.  Here a typed selector  
with a type encoding corresponding to the types of the method on the  
class of the receiver expression.

Unfortunately, the receiver is passed in as an llvm::Value and the  
Selector instance does not carry type information.

GCC emits this and we're now using it with the GNUstep implementation  
of NSInvocation to ensure that the layout of the stack frame in the  
caller and callee agree (throwing a run-time exception when they  
don't, which has helped us found a couple of bugs so far and I would  
rather not lose this capability with clang.

I can't see an obvious way of getting this information from the  
objects already passed to the CGObjCRuntime instance.  I wonder if  
someone can suggest the best approach for me to take here?

David