[PATCH] D56802: [CodeGenObjC] Treat ivar offsets variables as constant if they refer to ivars of a direct subclass of NSObject with an @implementation

[John McCall via Phabricator via cfe-commits]

rjmccall added a comment.

We've tossed around the idea of doing things like this before, but I was hoping that it wouldn't have to be specific to `NSObject` and that we'd e.g. have an attribute that guarantees that the `@interface` declares all the ivars for a class.  Are we still thinking that?  Even if this is just a step towards that, I think we should at least add a method to answer whether we have a statically-known layout for the class, rather than hard-coding that decision at the leaves like this.


Repository:
  rC Clang

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D56802/new/

https://reviews.llvm.org/D56802