D/Objective-C 64bit

[John Colvin]

On Tuesday, 11 March 2014 at 18:23:08 UTC, Jacob Carlborg wrote:
> I just wanted to let everyone know that I have implemented 
> D/Objective-C for 64bit. Everything that worked for 32bit 
> should work, except for exceptions, which are not implemented 
> yet.
>
> Objective-C on 64bit uses the modern runtime, which is also the 
> same used on iOS. This means D/Objective-C should now be 
> compatible with iOS as well, at least in theory.
>
> For those how don't know what D/Objective-C is. It is a 
> language extension to D making it ABI compatible with 
> Objective-C. This means it's possible to use Objective-C 
> classes, methods, protocols (interfaces) and so on, directly 
> just as it's currently possible to do with regular C functions.
>
> Here's a recap of what's implemented, both for 32 and 64bit 
> unless otherwise noticed:
>
> * Classes
> * Subclasses
> * Instance and class methods
> * Protocols (interfaces)
> * Properties
> * Exceptions (only 32bit)
> * Selectors
> * Class references
> * String literals
> * Casts
>
> Some improvements that are really not part of Objective-C but 
> are very convenient to have in D :
>
> * Constructors
> * Inheriting selectors
> * Automatically generated selectors
>
> On the other hand, here a list of what's not implemented yet:
>
> * Blocks (similar to delegates)
> * Categories (class extensions)
> * Any form of automatic memory management
> * Exceptions (64bit)
> * Vtable optimization (64bit)
>
> Objective-C exceptions on 64bit is implemented using the same 
> mechanism as C++. I'm wondering if it would be possible for D 
> (not just for this extension) to adapt this mechanism as well. 
> This would make D compatible with both C++ and Objective-C 
> exceptions on 64bit.
>
> A DIP is available here [1] and the latest implementation is 
> available here [2].
>
> [1] http://wiki.dlang.org/DIP43
> [2] https://github.com/jacob-carlborg/dmd/tree/d-objc

To what extent will this be portable to ldc/gdc?