1 files changed, 55 insertions, 0 deletions
diff --git a/lib/Sema/DeclSpec.cpp b/lib/Sema/DeclSpec.cpp
index f1e8b4ef9c..d450a32e77 100644
--- a/lib/Sema/DeclSpec.cpp
+++ b/lib/Sema/DeclSpec.cpp
@@ -13,8 +13,10 @@
 
 #include "clang/Parse/ParseDiagnostic.h" // FIXME: remove this back-dependency!
 #include "clang/Sema/DeclSpec.h"
+#include "clang/Sema/LocInfoType.h"
 #include "clang/Sema/ParsedTemplate.h"
 #include "clang/AST/ASTContext.h"
+#include "clang/AST/Expr.h"
 #include "clang/AST/NestedNameSpecifier.h"
 #include "clang/AST/TypeLoc.h"
 #include "clang/Lex/Preprocessor.h"
@@ -213,6 +215,59 @@ DeclaratorChunk DeclaratorChunk::getFunction(bool hasProto, bool isVariadic,
   return I;
 }
 
+bool Declarator::isDeclarationOfFunction() const {
+  if (isFunctionDeclarator())
+    return true;
+  
+  switch (DS.getTypeSpecType()) {
+    case TST_auto:
+    case TST_bool:
+    case TST_char:
+    case TST_char16:
+    case TST_char32:
+    case TST_class:
+    case TST_decimal128:
+    case TST_decimal32:
+    case TST_decimal64:
+    case TST_double:
+    case TST_enum:
+    case TST_error:
+    case TST_float:
+    case TST_int:
+    case TST_struct:
+    case TST_union:
+    case TST_unknown_anytype:
+    case TST_unspecified:
+    case TST_void:
+    case TST_wchar:
+      return false;
+
+    case TST_decltype:
+    case TST_typeofExpr:
+      if (Expr *E = DS.getRepAsExpr())
+        return E->getType()->isFunctionType();
+      return false;
+     
+    case TST_underlyingType:
+    case TST_typename:
+    case TST_typeofType: {
+      QualType QT = DS.getRepAsType().get();
+      if (QT.isNull())
+        return false;
+      
+      if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT))
+        QT = LIT->getType();
+
+      if (QT.isNull())
+        return false;
+        
+      return QT->isFunctionType();
+    }
+  }
+  
+  return false;
+}
+
 /// getParsedSpecifiers - Return a bitmask of which flavors of specifiers this
 /// declaration specifier includes.
 ///