ObjectiveC. Implement attribute 'objc_bridge_mutable'

whose semantic is currently identical to objc_bridge,
but their differences may manifest down the road with
further enhancements. // rdar://15498044

llvm-svn: 195376

1 files changed, 27 insertions, 0 deletions

diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index 38bffa2f99e..8b3d738c60b 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -4362,6 +4362,30 @@ static void handleObjCBridgeAttr(Sema &S, Scope *Sc, Decl *D,
                            Attr.getAttributeSpellingListIndex()));
 }
 
+static void handleObjCBridgeMutableAttr(Sema &S, Scope *Sc, Decl *D,
+                                        const AttributeList &Attr) {
+  if (!isa<RecordDecl>(D)) {
+    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type)
+    << Attr.getName()
+    << (S.getLangOpts().CPlusPlus ? ExpectedStructOrUnionOrClass
+        : ExpectedStructOrUnion);
+    return;
+  }
+  
+  IdentifierLoc *Parm = 0;
+  if (Attr.getNumArgs() == 1)
+    Parm = Attr.isArgIdent(0) ? Attr.getArgAsIdent(0) : 0;
+  
+  if (!Parm) {
+    S.Diag(D->getLocStart(), diag::err_objc_attr_not_id) << Attr.getName() << 0;
+    return;
+  }
+  
+  D->addAttr(::new (S.Context)
+             ObjCBridgeMutableAttr(Attr.getRange(), S.Context, Parm->Ident,
+                            Attr.getAttributeSpellingListIndex()));
+}
+
 static void handleObjCOwnershipAttr(Sema &S, Decl *D,
                                     const AttributeList &Attr) {
   if (hasDeclarator(D)) return;
@@ -4651,6 +4675,9 @@ static void ProcessDeclAttribute(Sema &S, Scope *scope, Decl *D,
       
   case AttributeList::AT_ObjCBridge:
     handleObjCBridgeAttr(S, scope, D, Attr); break;
+      
+  case AttributeList::AT_ObjCBridgeMutable:
+    handleObjCBridgeMutableAttr(S, scope, D, Attr); break;
 
   case AttributeList::AT_CFAuditedTransfer:
   case AttributeList::AT_CFUnknownTransfer: