harmony_scoping: Implement lexical bindings at top level

src/objects.cc

 // Copyright 2013 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 <sstream>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/allocation-site-scopes.h"
@@ skipping 14659 matching lines @@
       // Clamp undefined to NaN (default). All other types have been
       // converted to a number type further up in the call chain.
       DCHECK(value->IsUndefined());
     }
     array->set(index, double_value);
   }
   return array->GetIsolate()->factory()->NewNumber(double_value);
 }
 
 
+void GlobalObject::InvalidatePropertyCell(Handle<GlobalObject> global,
+                                          Handle<Name> name) {
+  DCHECK(!global->HasFastProperties());
+  Isolate* isolate = global->GetIsolate();
+  int entry = global->property_dictionary()->FindEntry(name);
+  if (entry != NameDictionary::kNotFound) {
+    Handle<PropertyCell> cell(
+        PropertyCell::cast(global->property_dictionary()->ValueAt(entry)));
+
+    Handle<Object> value(cell->value(), isolate);
+    Handle<PropertyCell> new_cell = isolate->factory()->NewPropertyCell(value);
+    global->property_dictionary()->ValueAtPut(entry, *new_cell);
+
+    Handle<Object> hole = global->GetIsolate()->factory()->the_hole_value();
+    PropertyCell::SetValueInferType(cell, hole);
+  }
+}
+
+
 Handle<PropertyCell> JSGlobalObject::EnsurePropertyCell(
     Handle<JSGlobalObject> global,
     Handle<Name> name) {
   DCHECK(!global->HasFastProperties());
   int entry = global->property_dictionary()->FindEntry(name);
   if (entry == NameDictionary::kNotFound) {
     Isolate* isolate = global->GetIsolate();
     Handle<PropertyCell> cell = isolate->factory()->NewPropertyCell(
         isolate->factory()->the_hole_value());
     PropertyDetails details(NONE, NORMAL, 0);
@@ skipping 1877 matching lines @@
   Handle<DependentCode> codes =
       DependentCode::Insert(handle(cell->dependent_code(), info->isolate()),
                             DependentCode::kPropertyCellChangedGroup,
                             info->object_wrapper());
   if (*codes != cell->dependent_code()) cell->set_dependent_code(*codes);
   info->dependencies(DependentCode::kPropertyCellChangedGroup)->Add(
       cell, info->zone());
 }
 
 } }  // namespace v8::internal