Scoped enumerations should not be treated as integer types (in the C

sense). Fixes <rdar://problem/9366066> by eliminating an inconsistency
between C++ overloading (which handled scoped enumerations correctly)
and C binary operator type-checking (which didn't).

llvm-svn: 130924

Author: DougGregor

clang/lib/AST/Type.cpp

@@ -517,7 +517,7 @@ bool Type::isIntegerType() const {
   if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType))
     // Incomplete enum types are not treated as integer types.
     // FIXME: In C++, enum types are never integer types.
-    return ET->getDecl()->isComplete();
+    return ET->getDecl()->isComplete() && !ET->getDecl()->isScoped();
   return false;
 }
 
@@ -641,7 +641,7 @@ bool Type::isSignedIntegerType() const {
   if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType)) {
     // Incomplete enum types are not treated as integer types.
     // FIXME: In C++, enum types are never integer types.
-    if (ET->getDecl()->isComplete())
+    if (ET->getDecl()->isComplete() && !ET->getDecl()->isScoped())
       return ET->getDecl()->getIntegerType()->isSignedIntegerType();
   }
 
@@ -667,7 +667,7 @@ bool Type::isUnsignedIntegerType() const {
   if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType)) {
     // Incomplete enum types are not treated as integer types.
     // FIXME: In C++, enum types are never integer types.
-    if (ET->getDecl()->isComplete())
+    if (ET->getDecl()->isComplete() && !ET->getDecl()->isScoped())
       return ET->getDecl()->getIntegerType()->isUnsignedIntegerType();
   }
 

clang/test/SemaCXX/enum-scoped.cpp

@@ -109,3 +109,13 @@ void PR9333() {
   scoped_enum e = scoped_enum::yes;
   if (e == scoped_enum::no) { }
 }
+
+// <rdar://problem/9366066>
+namespace rdar9366066 {
+  enum class X : unsigned { value };
+
+  void f(X x) {
+    x % X::value; // expected-error{{invalid operands to binary expression ('rdar9366066::X' and 'rdar9366066::X')}}
+    x % 8; // expected-error{{invalid operands to binary expression ('rdar9366066::X' and 'int')}}
+  }
+}