[clang] Update isDerivedFrom to support Objective-C classes 🔍

Summary:
This change updates `isDerivedFrom` to support Objective-C classes by
converting it to a polymorphic matcher.

Notes:
The matching behavior for Objective-C classes is modeled to match the
behavior of `isDerivedFrom` with C++ classes. To that effect,
`isDerivedFrom` matches aliased types of derived Objective-C classes,
including compatibility aliases. To achieve this, the AST visitor has
been updated to map compatibility aliases to their underlying
Objective-C class.

`isSameOrDerivedFrom` also provides similar behaviors for C++ and
Objective-C classes. The behavior that
`cxxRecordDecl(isSameOrDerivedFrom("X"))` does not match
`class Y {}; typedef Y X;` is mirrored for Objective-C in that
`objcInterfaceDecl(isSameOrDerivedFrom("X"))` does not match either
`@interface Y @end typedef Y X;` or
`@interface Y @end @compatibility_alias X Y;`.

Test Notes:
Ran clang unit tests.

Reviewers: aaron.ballman, jordan_rose, rjmccall, klimek, alexfh, gribozavr

Reviewed By: aaron.ballman, gribozavr

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D60543

llvm-svn: 368632

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/unittests/ASTMatchers/Dynamic/RegistryTest.cpp b/clang/unittests/ASTMatchers/Dynamic/RegistryTest.cpp
index cf016a120b1..4e5c0ffe2b4 100644
--- a/clang/unittests/ASTMatchers/Dynamic/RegistryTest.cpp
+++ b/clang/unittests/ASTMatchers/Dynamic/RegistryTest.cpp
@@ -439,7 +439,7 @@ TEST_F(RegistryTest, Errors) {
       Error.get()).isNull());
   EXPECT_EQ("Incorrect type for arg 1. "
             "(Expected = Matcher<CXXRecordDecl>) != "
-            "(Actual = Matcher<CXXRecordDecl>&Matcher"
+            "(Actual = Matcher<CXXRecordDecl|ObjCInterfaceDecl>&Matcher"
             "<MemberExpr|UnresolvedMemberExpr|CXXDependentScopeMemberExpr>)",
             Error->toString());
 }