Cleanup Delete backend implementation.

src/lookup.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/bootstrapper.h"
 #include "src/deoptimizer.h"
 #include "src/lookup.h"
 #include "src/lookup-inl.h"
@@ skipping 205 matching lines @@
 
   Handle<JSObject> receiver = GetStoreTarget();
   if (receiver->IsGlobalObject()) return;
   holder_ = receiver;
   holder_map_ = transition_map();
   JSObject::MigrateToMap(receiver, holder_map_);
   ReloadPropertyInformation();
 }
 
 
+void LookupIterator::Delete() {
+  Handle<JSObject> holder = Handle<JSObject>::cast(holder_);
+  if (IsElement()) {
+    ElementsAccessor* accessor = holder->GetElementsAccessor();
+    accessor->Delete(holder, number_);
+  } else {
+    PropertyNormalizationMode mode = holder->map()->is_prototype_map()
+                                         ? KEEP_INOBJECT_PROPERTIES
+                                         : CLEAR_INOBJECT_PROPERTIES;
+
+    if (holder->HasFastProperties()) {
+      JSObject::NormalizeProperties(holder, mode, 0, "DeletingProperty");
+      holder_map_ = handle(holder->map(), isolate_);
+      ReloadPropertyInformation();
+    }
+    // TODO(verwaest): Get rid of the name_ argument.
+    JSObject::DeleteNormalizedProperty(holder, name_, number_);
+    JSObject::ReoptimizeIfPrototype(holder);
+  }
+}
+
+
 void LookupIterator::TransitionToAccessorProperty(
     AccessorComponent component, Handle<Object> accessor,
     PropertyAttributes attributes) {
   DCHECK(!accessor->IsNull());
   // Can only be called when the receiver is a JSObject. JSProxy has to be
   // handled via a trap. Adding properties to primitive values is not
   // observable.
   Handle<JSObject> receiver = GetStoreTarget();
   holder_ = receiver;
   holder_map_ =
@@ skipping 234 matching lines @@
       case InterceptorState::kSkipNonMasking:
         return true;
       case InterceptorState::kProcessNonMasking:
         return false;
     }
   }
   return interceptor_state_ == InterceptorState::kProcessNonMasking;
 }
 }  // namespace internal
 }  // namespace v8