initial support for recognizing __transparent_union__ attributes

comments on the ML will follow

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@50262 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 13 insertions, 1 deletions

diff --git a/include/clang/AST/Attr.h b/include/clang/AST/Attr.h
index 72bc8a9ffa..abdcfb4b05 100644
--- a/include/clang/AST/Attr.h
+++ b/include/clang/AST/Attr.h
@@ -36,7 +36,8 @@ public:
     Format,
     Visibility,
     FastCall,
-    StdCall
+    StdCall,
+    TransparentUnion
   };
     
 private:
@@ -218,6 +219,16 @@ public:
   static bool classof(const StdCallAttr *A) { return true; }
 };
 
+class TransparentUnionAttr : public Attr {
+public:
+  TransparentUnionAttr() : Attr(TransparentUnion) {}
+
+  // Implement isa/cast/dyncast/etc.
+
+  static bool classof(const Attr *A) { return A->getKind() == TransparentUnion; }
+  static bool classof(const TransparentUnionAttr *A) { return true; }
+};
+
 }  // end namespace clang
 
 #endif
diff --git a/include/clang/Parse/AttributeList.h b/include/clang/Parse/AttributeList.h
index c71f8ff1f8..418dc00ac9 100644
--- a/include/clang/Parse/AttributeList.h
+++ b/include/clang/Parse/AttributeList.h
@@ -64,6 +64,7 @@ public:
     AT_stdcall,
     AT_nothrow,
     AT_noinline,
+    AT_transparent_union,
     AT_warn_unused_result
   };