[cfe-dev] Adding namespaces to Objective-C
owen.shepherd at e43.eu
Tue Nov 9 11:47:11 CST 2010
As someone interested in contributing to Clang - and, in particular, contributing to its Objective-C(++) support, I would like to hear people's thoughts with regards to adding support for namespaces to Objective-C.
1. Do we make this an extension to Objective-C, or to C itself? From my point of view, each way primarily boils
down to a matter of syntax: As an Objective-C extension, the keyword would likely be "@namespace"; while
as a C extension it would probably be "__namespace__" (or maybe just "namespace" in a hypothetical
2. Function name mangling. Function names follow the platform's C++ ABI (Much like the existing
3. When class names are involved in Objective-C symbols, then namespaced classes are mangled similarly to
C++ names are; a hypothetical MyNS::MyClass is mangled as 4MyNS7MyClass. This is backwards
compatible; traditional class names cannot start with numbers
4. The added namespace declarations are equivalent to and interchangeable with C++ " namespace"
Do any other people have any comments, or any thoughts on how best to stage this?
* At least for a first pass. It would seem prudent to define a different name mangling scheme for C namespaces long term. Perhaps we again take advantage of the illegality of numbers at the start of identifier names and mangle function names the same way we do classes?
-- Owen Shepherd
owen.shepherd at e43.eu (general) / oshepherd1 at shef.ac.uk (university)
P.S. Any estimates on when the official Git mirror will be available? I find Git to be incredibly useful for managing one's changes outside the official repository.
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