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?

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