[Sema][Comments] Support @param with c++ 'using' keyword

Give appropriate warnings with -Wdocumentation for @param comments
that refer to function aliases defined with 'using'. Very similar
to typedef's behavior. This does not add support for
TypeAliasTemplateDecl yet.

Differential Revision: https://reviews.llvm.org/D23783

rdar://problem/27300695

llvm-svn: 279662

1 files changed, 6 insertions, 6 deletions

diff --git a/clang/lib/AST/Comment.cpp b/clang/lib/AST/Comment.cpp
index f88e9e212e3..89a7b7fa902 100644
--- a/clang/lib/AST/Comment.cpp
+++ b/clang/lib/AST/Comment.cpp
@@ -226,12 +226,15 @@ void DeclInfo::fill() {
   case Decl::Namespace:
     Kind = NamespaceKind;
     break;
+  case Decl::TypeAlias:
   case Decl::Typedef: {
     Kind = TypedefKind;
-    // If this is a typedef to something we consider a function, extract
+    // If this is a typedef / using to something we consider a function, extract
     // arguments and return type.
-    const TypedefDecl *TD = cast<TypedefDecl>(CommentDecl);
-    const TypeSourceInfo *TSI = TD->getTypeSourceInfo();
+    const TypeSourceInfo *TSI =
+        K == Decl::Typedef
+            ? cast<TypedefDecl>(CommentDecl)->getTypeSourceInfo()
+            : cast<TypeAliasDecl>(CommentDecl)->getTypeSourceInfo();
     if (!TSI)
       break;
     TypeLoc TL = TSI->getTypeLoc().getUnqualifiedLoc();
@@ -302,9 +305,6 @@ void DeclInfo::fill() {
     }
     break;
   }
-  case Decl::TypeAlias:
-    Kind = TypedefKind;
-    break;
   case Decl::TypeAliasTemplate: {
     const TypeAliasTemplateDecl *TAT = cast<TypeAliasTemplateDecl>(CommentDecl);
     Kind = TypedefKind;