Add initial semi-working producers profile.

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 36 matching lines @@
 // 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_(capacity) {}
 
   List<Object**> objects_;
 };
 
 
+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
@@ skipping 25 matching lines @@
 
   // Process pending weak handles.
   static void PostGarbageCollectionProcessing();
 
   // Iterates over all handles.
   static void IterateRoots(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);
 
   // Returns the object groups.
@@ skipping 29 matching lines @@
   // Free list for DESTROYED global handles not yet deallocated.
   static Node* first_free_;
   static Node* first_free() { return first_free_; }
   static void set_first_free(Node* value) { first_free_ = value; }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_GLOBAL_HANDLES_H_