[PATCH] D86049: RFC: Implement optional exportable wrapper function generation for objc_direct methods.

[Puyan Lotfi via Phabricator via cfe-commits]

plotfi marked an inline comment as done.
plotfi added inline comments.


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Comment at: clang/include/clang/Basic/Attr.td:2251-2256
+def ObjCDirectVisible : Attr {
+  let Spellings = [Clang<"objc_direct_visible">];
+  let Subjects = SubjectList<[ObjCMethod], ErrorDiag>;
+  let LangOpts = [ObjC];
+  let Documentation = [ObjCDirectVisibleDocs];
+}
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plotfi wrote:
> mwyman wrote:
> > Should this inherit `ObjCDirect`, to include both objc_direct and the visibility aspect? I don't see any reason we would want to add `objc_direct_visible` without also having `objc_direct`, so why make developers add both?
> > 
> > As an alternative, would it make sense to allow adding `__attribute__((visibility("default")))` on direct methods?
> > 
> > Also, it doesn't seem like this allows making `@property`s visible, so should there be a similar attribute for properties?
> I'd prefer to do `@property`s in a separate commit, but I suppose you are thinking like a `objc_direct_members_visible` attribute? I think I can add that in a subsequent commit. 
> 
> I took a look at how to make things inherit and I think the most straightforward way is to have `handleObjCDirectVisibleAttr` set the objc_direct attribute if it is not set already.
> 
> As for `__attribute__((visibility("default")))` I think the trouble lies in what we want the default visibility behavior for objc methods to be and if we want the behavior to be controlled by `-fvisibility=`. I tried going by attribute visibility before and had some trouble too (I forget exactly what though). 
> 
> 
I gave visibility a try and it seems that the trouble is everything is visible by default where for objc methods we want them hidden by default. I think I would rather add a separate attr for this than add an additional non-conformant visibility mode. 


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