Generalize virtually dispatched scavenger to virtually dispatched specialized visitors.

src/mark-compact.h

 // Copyright 2006-2008 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 68 matching lines @@
 
   // Type of functions to process non-live objects.
   typedef void (*ProcessNonLiveFunction)(HeapObject* object);
 
   // Set the global force_compaction flag, it must be called before Prepare
   // to take effect.
   static void SetForceCompaction(bool value) {
     force_compaction_ = value;
   }
 
+
+  static void Initialize();
+
   // Prepares for GC by resetting relocation info in old and map spaces and
   // choosing spaces to compact.
   static void Prepare(GCTracer* tracer);
 
   // Performs a global garbage collection.
   static void CollectGarbage();
 
   // True if the last full GC performed heap compaction.
   static bool HasCompacted() { return compacting_collection_; }
 
@@ skipping 65 matching lines @@
   //
   //  Before: The heap has been prepared for garbage collection by
   //          MarkCompactCollector::Prepare() and is otherwise in its
   //          normal state.
   //
   //   After: Live objects are marked and non-live objects are unmarked.
 
 
   friend class RootMarkingVisitor;
   friend class MarkingVisitor;
+  friend class StaticMarkingVisitor;
 
   // Marking operations for objects reachable from roots.
   static void MarkLiveObjects();
 
   static void MarkUnmarkedObject(HeapObject* obj);
 
   static inline void MarkObject(HeapObject* obj) {
     if (!obj->IsMarked()) MarkUnmarkedObject(obj);
   }
 
@@ skipping 23 matching lines @@
   // symbol table are weak.
   static void MarkSymbolTable();
 
   // Mark objects in object groups that have at least one object in the
   // group marked.
   static void MarkObjectGroups();
 
   // Mark all objects in an object group with at least one marked
   // object, then all objects reachable from marked objects in object
   // groups, and repeat.
-  static void ProcessObjectGroups(MarkingVisitor* visitor);
+  static void ProcessObjectGroups();
 
   // Mark objects reachable (transitively) from objects in the marking stack
   // or overflowed in the heap.
-  static void ProcessMarkingStack(MarkingVisitor* visitor);
+  static void ProcessMarkingStack();
 
   // Mark objects reachable (transitively) from objects in the marking
   // stack.  This function empties the marking stack, but may leave
   // overflowed objects in the heap, in which case the marking stack's
   // overflow flag will be set.
-  static void EmptyMarkingStack(MarkingVisitor* visitor);
+  static void EmptyMarkingStack();
 
   // Refill the marking stack with overflowed objects from the heap.  This
   // function either leaves the marking stack full or clears the overflow
   // flag on the marking stack.
   static void RefillMarkingStack();
 
   // Callback function for telling whether the object *p is an unmarked
   // heap object.
   static bool IsUnmarkedHeapObject(Object** p);
 
@@ skipping 204 matching lines @@
 
   friend class UnmarkObjectVisitor;
   static void UnmarkObject(HeapObject* obj);
 #endif
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_MARK_COMPACT_H_