aaron.ballman added reviewers: jordan_rose, rjmccall.
aaron.ballman added a comment.

Adding some ObjC experts in case they'd like to weigh in on the name 
`isDerivedFrom` in this context.



================
Comment at: clang/include/clang/ASTMatchers/ASTMatchers.h:1479
+/// \endcode
+AST_MATCHER_P(ObjCInterfaceDecl, isSubclassOfInterface,
+              internal::Matcher<ObjCInterfaceDecl>,
----------------
stephanemoore wrote:
> aaron.ballman wrote:
> > stephanemoore wrote:
> > > I am still uncertain about the naming.
> > > 
> > > `isSubclassOf` seemed too generic as that could apply to C++ classes.
> > > `objcIsSubclassOf` seemed unconventional as a matcher name.
> > > `isSubclassOfObjCInterface` and `isSubclassOfObjCClass` seemed awkwardly 
> > > lengthy.
> > > Creating a new namespace `clang::ast_matchers::objc` seemed unprecedented.
> > > 
> > > I am happy to change the name if you think another name would be more 
> > > appropriate.
> > Does ObjC use the term "derived" by any chance? We already have 
> > `isDerivedFrom`, so I'm wondering if we can use that to also match on an 
> > `ObjCInterfaceDecl`?
> Objective-C doesn't generally use the term "derived" (for example, see 
> archive of [Programming With Objective-C > Defining 
> Classes](https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/DefiningClasses/DefiningClasses.html#//apple_ref/doc/uid/TP40011210-CH3-SW1)).
>  With that said, I don't think it's unreasonable or incorrect to use the term 
> "derived" to describe inheritance in Objective-C. The behavior of this 
> matcher is also consistent with the behavior of `isDerivedFrom`. In order to 
> change `isDerivedFrom`, I would also need to update `isSameOrDerivedFrom`. 
> That would probably be a good thing so that derivation matching feature set 
> is consistent for C++ and Objective-C language variants.
> 
> Let me take a crack at merging this into `isDerivedFrom`.
I agree that if we go with `isDerivedFrom`, you should update 
`isSameOrDerivedFrom` at the same time.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D60543/new/

https://reviews.llvm.org/D60543



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