[objc] Introduce attribute 'objc_designated_initializer'.

It only applies to methods of init family in an interface declaration.

llvm-svn: 196314

1 files changed, 25 insertions, 0 deletions

diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index 24f9f5fd252..b732fccacf8 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -3713,6 +3713,28 @@ static void handleObjCBridgeMutableAttr(Sema &S, Scope *Sc, Decl *D,
                             Attr.getAttributeSpellingListIndex()));
 }
 
+static void handleObjCDesignatedInitializer(Sema &S, Decl *D,
+                                            const AttributeList &Attr) {
+  SourceLocation Loc = Attr.getLoc();
+  ObjCMethodDecl *Method = cast<ObjCMethodDecl>(D);
+
+  if (Method->getMethodFamily() != OMF_init) {
+    S.Diag(D->getLocStart(), diag::err_attr_objc_designated_not_init_family)
+    << SourceRange(Loc, Loc);
+    return;
+  }
+  DeclContext *DC = Method->getDeclContext();
+  if (!isa<ObjCInterfaceDecl>(DC)) {
+    S.Diag(D->getLocStart(), diag::err_attr_objc_designated_not_interface)
+    << SourceRange(Loc, Loc);
+    return;
+  }
+
+  Method->addAttr(::new (S.Context)
+                  ObjCDesignatedInitializerAttr(Attr.getRange(), S.Context,
+                                         Attr.getAttributeSpellingListIndex()));
+}
+
 static void handleObjCOwnershipAttr(Sema &S, Decl *D,
                                     const AttributeList &Attr) {
   if (hasDeclarator(D)) return;
@@ -3963,6 +3985,9 @@ static void ProcessDeclAttribute(Sema &S, Scope *scope, Decl *D,
   case AttributeList::AT_ObjCBridgeMutable:
     handleObjCBridgeMutableAttr(S, scope, D, Attr); break;
 
+  case AttributeList::AT_ObjCDesignatedInitializer:
+    handleObjCDesignatedInitializer(S, D, Attr); break;
+
   case AttributeList::AT_CFAuditedTransfer:
     handleCFAuditedTransferAttr(S, D, Attr); break;
   case AttributeList::AT_CFUnknownTransfer: