New GC APIs, try 2.

src/mark-compact.cc

 // Copyright 2012 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 1921 matching lines @@
 
 void MarkCompactCollector::MarkImplicitRefGroups() {
   List<ImplicitRefGroup*>* ref_groups =
       isolate()->global_handles()->implicit_ref_groups();
 
   int last = 0;
   for (int i = 0; i < ref_groups->length(); i++) {
     ImplicitRefGroup* entry = ref_groups->at(i);
     ASSERT(entry != NULL);
 
-    if (!IsMarked(*entry->parent_)) {
+    if (!IsMarked(*entry->parent)) {
       (*ref_groups)[last++] = entry;
       continue;
     }
 
-    Object*** children = entry->children_;
+    Object*** children = entry->children;
     // A parent object is marked, so mark all child heap objects.
-    for (size_t j = 0; j < entry->length_; ++j) {
+    for (size_t j = 0; j < entry->length; ++j) {
       if ((*children[j])->IsHeapObject()) {
         HeapObject* child = HeapObject::cast(*children[j]);
         MarkBit mark = Marking::MarkBitFrom(child);
         MarkObject(child, mark);
       }
     }
 
     // Once the entire group has been marked, dispose it because it's
     // not needed anymore.
-    entry->Dispose();
+    delete entry;
   }
   ref_groups->Rewind(last);
 }
 
 
 // Mark all objects reachable from the objects on the marking stack.
 // Before: the marking stack contains zero or more heap object pointers.
 // After: the marking stack is empty, and all objects reachable from the
 // marking stack have been marked, or are overflowed in the heap.
 void MarkCompactCollector::EmptyMarkingDeque() {
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   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 
 
 } }  // namespace v8::internal