WIP: Blocks for global handles.

src/global-handles.h

 // Copyright 2011 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 206 matching lines @@
 
   // Tear down the global handle structure.
   void TearDown();
 
   Isolate* isolate() { return isolate_; }
 
 #ifdef DEBUG
   void PrintStats();
   void Print();
 #endif
-  class Pool;
+
  private:
   explicit GlobalHandles(Isolate* isolate);
 
-  // Internal node structure, one for each global handle.
+  // Internal node structures.
   class Node;
+  class NodeBlock;
+  class NodeIterator;
 
   Isolate* isolate_;
 
   // Field always containing the number of weak and near-death handles.
   int number_of_weak_handles_;
 
   // Field always containing the number of weak and near-death handles
   // to global objects.  These objects are also included in
   // number_of_weak_handles_.
   int number_of_global_object_weak_handles_;
 
-  // Global handles are kept in a single linked list pointed to by head_.
-  Node* head_;
-  Node* head() { return head_; }
-  void set_head(Node* value) { head_ = value; }
+  NodeBlock* first_block_;
+  NodeBlock* first_used_block_;
+  Node* first_free_;
 
-  // Free list for DESTROYED global handles not yet deallocated.
-  Node* first_free_;
-  Node* first_free() { return first_free_; }
-  void set_first_free(Node* value) { first_free_ = value; }
+  int post_gc_processing_count_;
 
-  // List of deallocated nodes.
-  // Deallocated nodes form a prefix of all the nodes and
-  // |first_deallocated| points to last deallocated node before
-  // |head|.  Those deallocated nodes are additionally linked
-  // by |next_free|:
-  //                                    1st deallocated  head
-  //                                           |          |
-  //                                           V          V
-  //    node          node        ...         node       node
-  //      .next      -> .next ->                .next ->
-  //   <- .next_free <- .next_free           <- .next_free
-  Node* first_deallocated_;
-  Node* first_deallocated() { return first_deallocated_; }
-  void set_first_deallocated(Node* value) {
-    first_deallocated_ = value;
-  }
-
-  Pool* pool_;
-  int post_gc_processing_count_;
   List<ObjectGroup*> object_groups_;
   List<ImplicitRefGroup*> implicit_ref_groups_;
+  List<Node*> new_space_independent_;
 
   friend class Isolate;
 
   DISALLOW_COPY_AND_ASSIGN(GlobalHandles);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_GLOBAL_HANDLES_H_