X64: Reenabled RSet.

src/heap.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 239 matching lines @@
   // Returns the maximum object size in paged space.
   static inline int MaxObjectSizeInPagedSpace();
 
   // Returns of size of all objects residing in the heap.
   static int SizeOfObjects();
 
   // Return the starting address and a mask for the new space.  And-masking an
   // address with the mask will result in the start address of the new space
   // for all addresses in either semispace.
   static Address NewSpaceStart() { return new_space_.start(); }
-  static uint32_t NewSpaceMask() { return new_space_.mask(); }
+  static uintptr_t NewSpaceMask() { return new_space_.mask(); }
   static Address NewSpaceTop() { return new_space_.top(); }
 
   static NewSpace* new_space() { return &new_space_; }
   static OldSpace* old_pointer_space() { return old_pointer_space_; }
   static OldSpace* old_data_space() { return old_data_space_; }
   static OldSpace* code_space() { return code_space_; }
   static MapSpace* map_space() { return map_space_; }
   static CellSpace* cell_space() { return cell_space_; }
   static LargeObjectSpace* lo_space() { return lo_space_; }
 
@@ skipping 845 matching lines @@
 // As VerifyPointersVisitor but also checks that remembered set bits are
 // always set for pointers into new space.
 class VerifyPointersAndRSetVisitor: public ObjectVisitor {
  public:
   void VisitPointers(Object** start, Object** end) {
     for (Object** current = start; current < end; current++) {
       if ((*current)->IsHeapObject()) {
         HeapObject* object = HeapObject::cast(*current);
         ASSERT(Heap::Contains(object));
         ASSERT(object->map()->IsMap());
-#ifndef V8_TARGET_ARCH_X64
         if (Heap::InNewSpace(object)) {
           ASSERT(Page::IsRSetSet(reinterpret_cast<Address>(current), 0));
         }
-#endif
       }
     }
   }
 };
 #endif
 
 
 // Space iterator for iterating over all spaces of the heap.
 // Returns each space in turn, and null when it is done.
 class AllSpaces BASE_EMBEDDED {
@@ skipping 322 matching lines @@
   int marked_count_;
 
   // The count from the end of the previous full GC.  Will be zero if there
   // was no previous full GC.
   int previous_marked_count_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_