Introduce one way dependencies into object grouping.

src/global-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 523 matching lines @@
 }
 
 #endif
 
 List<ObjectGroup*>* GlobalHandles::ObjectGroups() {
   // Lazily initialize the list to avoid startup time static constructors.
   static List<ObjectGroup*> groups(4);
   return &groups;
 }
 
-void GlobalHandles::AddGroup(Object*** handles,
-                             size_t length,
-                             v8::RetainedObjectInfo* info) {
+
+void GlobalHandles::AddObjectGroup(Object*** handles,
+                                   size_t length,
+                                   v8::RetainedObjectInfo* info) {
   ObjectGroup* new_entry = new ObjectGroup(length, info);
-  for (size_t i = 0; i < length; ++i)
+  for (size_t i = 0; i < length; ++i) {
     new_entry->objects_.Add(handles[i]);
+  }
   ObjectGroups()->Add(new_entry);
 }
 
 
+List<ImplicitRefGroup*>* GlobalHandles::ImplicitRefGroups() {
+  // Lazily initialize the list to avoid startup time static constructors.
+  static List<ImplicitRefGroup*> groups(4);
+  return &groups;
+}
+
+
+void GlobalHandles::AddImplicitRefGroup(HeapObject* parent,
+                                        Object*** children,
+                                        size_t length) {
+  ImplicitRefGroup* new_entry = new ImplicitRefGroup(parent, length);
+  for (size_t i = 0; i < length; ++i) {
+    new_entry->children_.Add(children[i]);
+  }
+  ImplicitRefGroups()->Add(new_entry);
+}
+
+
 void GlobalHandles::RemoveObjectGroups() {
   List<ObjectGroup*>* object_groups = ObjectGroups();
   for (int i = 0; i< object_groups->length(); i++) {
     delete object_groups->at(i);
   }
   object_groups->Clear();
 }
 
+
+void GlobalHandles::RemoveImplicitRefGroups() {
+  List<ImplicitRefGroup*>* ref_groups = ImplicitRefGroups();
+  for (int i = 0; i< ref_groups->length(); i++) {
+    delete ref_groups->at(i);
+  }
+  ref_groups->Clear();
+}
+
+
 } }  // namespace v8::internal