[PATCH] D66121: Debug Info: Nest Objective-C property function decls inside their container.

Adrian Prantl via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Tue Aug 13 13:53:49 PDT 2019

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

Comment at: clang/lib/CodeGen/CGDebugInfo.h:406
+                         CGBuilderTy &Builder,
+                         const ObjCContainerDecl *CD = nullptr);
rjmccall wrote:
> aprantl wrote:
> > rjmccall wrote:
> > > Why does this have to be an extra parameter?  The method's DC should be the container.
> > ```
> > @protocol BarProto
> > @property struct Bar *bar;
> > @end
> > 
> > @interface Foo <BarProto>
> > @end
> > 
> > @implementation Foo {}
> > @synthesize bar = _bar;
> > @end
> > ```
> > 
> > The ObjCMethodDecl for the synthesized `bar` accessors is the method decl in the protocol `BarProto`, as there is no method decl put into the AST inside of `Foo`. Its DeclContext (lexical an regular) therefor is the Protocol, which is not what we want as the decl context for a synthesized method called `-[Foo setBar:]` in the debug info.
> Wait, really?  That seems pretty unfortunate.  Should we synthesize a real implementation method?
That certainly sounds like the more elegant solution. I didn't know enough about Clang's ObjC implementation to understand whether this was feasible. Do you happen to know where a good entry point for doing this would be?



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