[cfe-dev] blocks/lambdas in clang

Chris Lattner clattner at apple.com
Tue Jan 12 13:33:37 PST 2010

On Jan 12, 2010, at 1:26 PM, Blaine Garst wrote:

> The compiler initializes the first word of every block to one of two  
> symbols (the other being _NSConcreteStackBlock), that being one of  
> them, so as to enable Objective-C treating blocks as objects if and  
> when the objc runtime is loaded.  The blocks runtime for the most  
> part ignores these values until such a time.  A block copy operation  
> will use another symbol, so in total I think you'll need  
> _NSConcreteMallocBlock also.

This runtime support code is available at http://compiler-rt.llvm.org/


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