DHowett-MSFT added a comment.

In https://reviews.llvm.org/D47233#1129207, @rjmccall wrote:

> In https://reviews.llvm.org/D47233#1129110, @smeenai wrote:
> > WinObjC does this wrapping, for example.
> I see.  The idea of creating the type descriptors and mangled names ad-hoc 
> for the catchable-types array is clever, and it's nice that the ABI is 
> defined in a way that makes that work.  (Expensive, but hey, it's the 
> exceptions path.)

We ran into some critical issues with this approach on x64. The pointers in the 
exception record are supposed to be image-relative instead of absolute, so I 
tried to make them absolute to libobjc2's load address, but I never quite 
solved it.

A slightly better-documented and cleaner version of the code you linked is here 

  rC Clang


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