Add an interface for an embedder to provide information about native

src/global-handles.h

 // Copyright 2007-2008 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 30 matching lines @@
 
 // Callback function on handling weak global handles.
 // typedef bool (*WeakSlotCallback)(Object** pointer);
 
 // An object group is treated like a single JS object: if one of object in
 // the group is alive, all objects in the same group are considered alive.
 // An object group is used to simulate object relationship in a DOM tree.
 class ObjectGroup : public Malloced {
  public:
   ObjectGroup() : objects_(4) {}
-  explicit ObjectGroup(size_t capacity)
-      : objects_(static_cast<int>(capacity)) { }
+  ObjectGroup(size_t capacity, v8::RetainedObjectInfo* info)
+      : objects_(static_cast<int>(capacity)),
+        info_(info) { }
+  ~ObjectGroup() { if (info_ != NULL) info_->Dispose(); }
 
   List<Object**> objects_;
+  v8::RetainedObjectInfo* info_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ObjectGroup);
 };
 
 
 typedef void (*WeakReferenceGuest)(Object* object, void* parameter);
 
 class GlobalHandles : public AllStatic {
  public:
   // Creates a new global handle that is alive until Destroy is called.
   static Handle<Object> Create(Object* value);
 
   // Destroy a global handle.
   static void Destroy(Object** location);
 
   // Make the global handle weak and set the callback parameter for the
   // handle.  When the garbage collector recognizes that only weak global
   // handles point to an object the handles are cleared and the callback
   // function is invoked (for each handle) with the handle and corresponding
   // parameter as arguments.  Note: cleared means set to Smi::FromInt(0). The
   // reason is that Smi::FromInt(0) does not change during garage collection.
   static void MakeWeak(Object** location,
                        void* parameter,
                        WeakReferenceCallback callback);
 
+  static void SetWrapperClassId(Object** location, uint16_t class_id);
+
   // Returns the current number of weak handles.
   static int NumberOfWeakHandles() { return number_of_weak_handles_; }
 
   static void RecordStats(HeapStats* stats);
 
   // Returns the current number of weak handles to global objects.
   // These handles are also included in NumberOfWeakHandles().
   static int NumberOfGlobalObjectWeakHandles() {
     return number_of_global_object_weak_handles_;
   }
@@ skipping 10 matching lines @@
   // Process pending weak handles.
   // Returns true if next major GC is likely to collect more garbage.
   static bool PostGarbageCollectionProcessing();
 
   // Iterates over all strong handles.
   static void IterateStrongRoots(ObjectVisitor* v);
 
   // Iterates over all handles.
   static void IterateAllRoots(ObjectVisitor* v);
 
+  // Iterates over all handles that have embedder-assigned class ID.
+  static void IterateAllRootsWithClassIds(ObjectVisitor* v);
+
   // Iterates over all weak roots in heap.
   static void IterateWeakRoots(ObjectVisitor* v);
 
   // Iterates over weak roots that are bound to a given callback.
   static void IterateWeakRoots(WeakReferenceGuest f,
                                WeakReferenceCallback callback);
 
   // Find all weak handles satisfying the callback predicate, mark
   // them as pending.
   static void IdentifyWeakHandles(WeakSlotCallback f);
 
   // Add an object group.
   // Should only used in GC callback function before a collection.
   // All groups are destroyed after a mark-compact collection.
-  static void AddGroup(Object*** handles, size_t length);
+  static void AddGroup(Object*** handles,
+                       size_t length,
+                       v8::RetainedObjectInfo* info);
 
   // Returns the object groups.
   static List<ObjectGroup*>* ObjectGroups();
 
   // Remove bags, this should only happen after GC.
   static void RemoveObjectGroups();
 
   // Tear down the global handle structure.
   static void TearDown();
 
@@ skipping 39 matching lines @@
   static Node* first_deallocated() { return first_deallocated_; }
   static void set_first_deallocated(Node* value) {
     first_deallocated_ = value;
   }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_GLOBAL_HANDLES_H_