Add an interface for an embedder to provide information about native

src/global-handles.cc

Index: src/global-handles.cc
diff --git a/src/global-handles.cc b/src/global-handles.cc
index 18cdc5a3af5615e559e6d91faed474ef7430c8c5..2cd5e0c4d0a299003c0c1c59302e6b5420dd8b37 100644
--- a/src/global-handles.cc
+++ b/src/global-handles.cc
@@ -41,6 +41,7 @@ class GlobalHandles::Node : public Malloced {
   void Initialize(Object* object) {
     // Set the initial value of the handle.
     object_ = object;
+    class_id_ = v8::kPersistentHandleNoClassId;
     state_  = NORMAL;
     parameter_or_next_free_.parameter = NULL;
     callback_ = NULL;
@@ -137,6 +138,14 @@ class GlobalHandles::Node : public Malloced {
     return state_ == WEAK;
   }
 
+  bool CanBeRetainer() {
+    return state_ != DESTROYED && state_ != NEAR_DEATH;
+  }
+
+  void SetWrapperClassId(uint16_t class_id) {
+    class_id_ = class_id;
+  }
+
   // Returns the id for this weak handle.
   void set_parameter(void* parameter) {
     ASSERT(state_ != DESTROYED);
@@ -190,6 +199,8 @@ class GlobalHandles::Node : public Malloced {
   // Place the handle address first to avoid offset computation.
   Object* object_;  // Storage for object pointer.
 
+  uint16_t class_id_;
+
   // Transition diagram:
   // NORMAL <-> WEAK -> PENDING -> NEAR_DEATH -> { NORMAL, WEAK, DESTROYED }
   enum State {
@@ -199,7 +210,7 @@ class GlobalHandles::Node : public Malloced {
     NEAR_DEATH,  // Callback has informed the handle is near death.
     DESTROYED
   };
-  State state_;
+  State state_ : 3;
 
  private:
   // Handle specific callback.
@@ -337,6 +348,11 @@ bool GlobalHandles::IsWeak(Object** location) {
 }
 
 
+void GlobalHandles::SetWrapperClassId(Object** location, uint16_t class_id) {
+  Node::FromLocation(location)->SetWrapperClassId(class_id);
+}
+
+
 void GlobalHandles::IterateWeakRoots(ObjectVisitor* v) {
   // Traversal of GC roots in the global handle list that are marked as
   // WEAK or PENDING.
@@ -435,6 +451,16 @@ void GlobalHandles::IterateAllRoots(ObjectVisitor* v) {
 }
 
 
+void GlobalHandles::IterateAllRootsWithClassIds(ObjectVisitor* v) {
+  for (Node* current = head_; current != NULL; current = current->next()) {
+    if (current->class_id_ != v8::kPersistentHandleNoClassId &&
+        current->CanBeRetainer()) {
+      v->VisitEmbedderReference(&current->object_, current->class_id_);
+    }
+  }
+}
+
+
 void GlobalHandles::TearDown() {
   // Reset all the lists.
   set_head(NULL);
@@ -515,8 +541,10 @@ List<ObjectGroup*>* GlobalHandles::ObjectGroups() {
   return &groups;
 }
 
-void GlobalHandles::AddGroup(Object*** handles, size_t length) {
-  ObjectGroup* new_entry = new ObjectGroup(length);
+void GlobalHandles::AddGroup(Object*** handles,
+                             size_t length,
+                             v8::RetainedObjectInfo* info) {
+  ObjectGroup* new_entry = new ObjectGroup(length, info);
   for (size_t i = 0; i < length; ++i)
     new_entry->objects_.Add(handles[i]);
   ObjectGroups()->Add(new_entry);