Extend Handle API with MarkIndependent.

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 128 matching lines @@
 
   // Returns the current number of weak handles to global objects.
   // These handles are also included in NumberOfWeakHandles().
   int NumberOfGlobalObjectWeakHandles() {
     return number_of_global_object_weak_handles_;
   }
 
   // Clear the weakness of a global handle.
   void ClearWeakness(Object** location);
 
+  // Clear the weakness of a global handle.
+  void MarkIndependent(Object** location);
+
   // Tells whether global handle is near death.
   static bool IsNearDeath(Object** location);
 
   // Tells whether global handle is weak.
   static bool IsWeak(Object** location);
 
   // Process pending weak handles.
   // Returns true if next major GC is likely to collect more garbage.
   bool PostGarbageCollectionProcessing();
 
   // Iterates over all strong handles.
   void IterateStrongRoots(ObjectVisitor* v);
 
+  // Iterates over all strong and dependent handles.
+  void IterateStrongAndDependentRoots(ObjectVisitor* v);
+
   // Iterates over all handles.
   void IterateAllRoots(ObjectVisitor* v);
 
   // Iterates over all handles that have embedder-assigned class ID.
   void IterateAllRootsWithClassIds(ObjectVisitor* v);
 
   // Iterates over all weak roots in heap.
   void IterateWeakRoots(ObjectVisitor* v);
 
+  // Iterates over all weak independent roots in heap.
+  void IterateWeakIndependentRoots(ObjectVisitor* v);
+
   // Iterates over weak roots that are bound to a given callback.
   void IterateWeakRoots(WeakReferenceGuest f,
                         WeakReferenceCallback callback);
 
+  // Iterates over weak independent roots that are bound to a given callback.

[Vitaly Repeshko, 2011/05/16 13:42:11]

The comment is wrong, but we should most likely refactor this function.

[Vyacheslav Egorov (Chromium), 2011/05/16 14:15:46]

Yep. Thanks for catching it. Copy/paste with wrong direction vector (should have
c/p from below, but did c&p from above).

+  void IdentifyWeakIndependentHandles(WeakSlotCallbackWithHeap f);
+
   // Find all weak handles satisfying the callback predicate, mark
   // them as pending.
   void IdentifyWeakHandles(WeakSlotCallback f);
 
   // Add an object group.
   // Should be only used in GC callback function before a collection.
   // All groups are destroyed after a mark-compact collection.
   void AddObjectGroup(Object*** handles,
                       size_t length,
                       v8::RetainedObjectInfo* info);
@@ skipping 77 matching lines @@
 
   friend class Isolate;
 
   DISALLOW_COPY_AND_ASSIGN(GlobalHandles);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_GLOBAL_HANDLES_H_