[PATCH] D55869: Convert some ObjC retain/release msgSends to runtime calls

Jonathan Schleifer via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Thu Dec 20 09:21:35 PST 2018

js added a comment.

In D55869#1337711 <https://reviews.llvm.org/D55869#1337711>, @dexonsmith wrote:

> In D55869#1337706 <https://reviews.llvm.org/D55869#1337706>, @js wrote:
> > The ObjFW runtime itself does not contain anything about release, retain or autorelease - these are all part of ObjFW (as in the framework). As ObjFW also supports the Apple runtime, as well as mixing with Foundation code, it so far only provides objc_retain and objc_release when they are missing, to make ARC work. They just call into the corresponding methods on the object and do nothing else.
> >
> > How will this change work from the Apple runtime? Will objc_retain/objc_release call the retain/release on the object if it implements its own? Should I drop my own retain/release implementation from my root object if I am compiling against the Apple runtime?
> Yes, the idea is that the specialized runtime functions are fast paths for the common case, but they still fall back if the object has overridden them.

I am guessing not just overridden, but also a root class providing one? IOW, the fast path is used when the class does not have the retain or release method at all? In that case, LGTM as is.



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