Add Support for 'warn_unused_result" attribute on

objective-c methods. (radar 7418262).



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@99903 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 8 insertions, 1 deletions

diff --git a/lib/AST/Expr.cpp b/lib/AST/Expr.cpp
index 6a71e925d9..b4e5a5d960 100644
--- a/lib/AST/Expr.cpp
+++ b/lib/AST/Expr.cpp
@@ -914,8 +914,15 @@ bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1,
   case CXXConstructExprClass:
     return false;
 
-  case ObjCMessageExprClass:
+  case ObjCMessageExprClass: {
+    const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this);
+    const ObjCMethodDecl *MD = ME->getMethodDecl();
+    if (MD && MD->getAttr<WarnUnusedResultAttr>()) {
+      Loc = getExprLoc();
+      return true;
+    }
     return false;
+  }
 
   case ObjCImplicitSetterGetterRefExprClass: {   // Dot syntax for message send.
 #if 0