Avoid dictionary expansion during bootstrapping

src/handles.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 146 matching lines @@
 
 
 void SetExpectedNofPropertiesFromEstimate(Handle<JSFunction> func,
                                           int estimate) {
   SetExpectedNofProperties(
       func, ExpectedNofPropertiesFromEstimate(estimate));
 }
 
 
 void NormalizeProperties(Handle<JSObject> object,
-                         PropertyNormalizationMode mode) {
-  CALL_HEAP_FUNCTION_VOID(object->NormalizeProperties(mode));
+                         PropertyNormalizationMode mode,
+                         int expected_additional_properties) {
+  CALL_HEAP_FUNCTION_VOID(object->NormalizeProperties(
+      mode,
+      expected_additional_properties));
 }
 
 
 void NormalizeElements(Handle<JSObject> object) {
   CALL_HEAP_FUNCTION_VOID(object->NormalizeElements());
 }
 
 
 void TransformToFastProperties(Handle<JSObject> object,
                                int unused_property_fields) {
@@ skipping 465 matching lines @@
 
 
 bool CompileLazyInLoop(Handle<JSFunction> function, ClearExceptionFlag flag) {
   // Compile the source information to a code object.
   Handle<SharedFunctionInfo> shared(function->shared());
   return CompileLazyShared(shared, flag, 1);
 }
 
 OptimizedObjectForAddingMultipleProperties::
 OptimizedObjectForAddingMultipleProperties(Handle<JSObject> object,
+                                           int expected_additional_properties,
                                            bool condition) {
   object_ = object;
   if (condition && object_->HasFastProperties()) {
     // Normalize the properties of object to avoid n^2 behavior
-    // when extending the object multiple properties.
+    // when extending the object multiple properties. Indicate the number of
+    // properties to be added.
     unused_property_fields_ = object->map()->unused_property_fields();
-    NormalizeProperties(object_, KEEP_INOBJECT_PROPERTIES);
+    NormalizeProperties(object_,
+                        KEEP_INOBJECT_PROPERTIES,
+                        expected_additional_properties);
     has_been_transformed_ = true;
 
   } else {
     has_been_transformed_ = false;
   }
 }
 
 
 OptimizedObjectForAddingMultipleProperties::
 ~OptimizedObjectForAddingMultipleProperties() {
@@ skipping 80 matching lines @@
   Handle<Map> new_map = Factory::CopyMapDropTransitions(old_map);
   obj->set_map(*new_map);
   new_map->set_needs_loading(true);
   // Store the lazy loading info in the constructor field.  We'll
   // reestablish the constructor from the fixed array after loading.
   new_map->set_constructor(*arr);
   ASSERT(!obj->IsLoaded());
 }
 
 } }  // namespace v8::internal