Add warning for functions/blocks that have attribute 'noreturn' but return a non-void result. (<rdar://problem/7562925>)

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@111492 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 14 insertions, 1 deletions

diff --git a/lib/Sema/SemaType.cpp b/lib/Sema/SemaType.cpp
index accd7e63ed..e3628c1d5f 100644
--- a/lib/Sema/SemaType.cpp
+++ b/lib/Sema/SemaType.cpp
@@ -1833,6 +1833,14 @@ static void HandleObjCGCTypeAttribute(QualType &Type,
   Type = S.Context.getObjCGCQualType(Type, GCAttr);
 }
 
+static QualType GetResultType(QualType T) {
+  if (const PointerType *PT = T->getAs<PointerType>())
+    T = PT->getPointeeType();
+  else if (const BlockPointerType *BT = T->getAs<BlockPointerType>())
+    T = BT->getPointeeType();
+  return T->getAs<FunctionType>()->getResultType();
+}
+
 /// Process an individual function attribute.  Returns true if the
 /// attribute does not make sense to apply to this type.
 bool ProcessFnAttr(Sema &S, QualType &Type, const AttributeList &Attr) {
@@ -1849,7 +1857,12 @@ bool ProcessFnAttr(Sema &S, QualType &Type, const AttributeList &Attr) {
         && !Type->isBlockPointerType()
         && !Type->isFunctionType())
       return true;
-
+    
+    if (!GetResultType(Type)->isVoidType()) {
+      S.Diag(Attr.getLoc(), diag::warn_noreturn_function_has_nonvoid_result)
+        << (Type->isBlockPointerType() ? /* blocks */ 1 : /* functions */ 0);
+    }
+    
     // Otherwise we can process right away.
     Type = S.Context.getNoReturnType(Type);
     return false;