Create an abstraction (MarkBit) object to hold the location of the...

src/runtime-profiler.cc

 // Copyright 2010 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 384 matching lines @@
         sampler_window[i] = NULL;
       }
     }
   }
 }
 
 
 void RuntimeProfiler::RemoveDeadSamples() {
   for (int i = 0; i < kSamplerWindowSize; i++) {
     Object* function = sampler_window[i];
-    if (function != NULL && !Marking::IsMarked(HeapObject::cast(function))) {
+    if (function != NULL &&
+        !Marking::MarkBitFrom(HeapObject::cast(function)).Get()) {
       sampler_window[i] = NULL;
     }
   }
 }
 
 
 void RuntimeProfiler::UpdateSamplesAfterCompact(ObjectVisitor* visitor) {
   for (int i = 0; i < kSamplerWindowSize; i++) {
     visitor->VisitPointer(&sampler_window[i]);
   }
@@ skipping 18 matching lines @@
         if (Top::WaitForJSState()) return true;
       }
     }
   }
 #endif
   return false;
 }
 
 
 } }  // namespace v8::internal