Estimate a (close) upper bound on the size of black-marked objects on each page.

src/assembler.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 72 matching lines @@
 class Label BASE_EMBEDDED {
  public:
   enum Distance {
     kNear, kFar
   };
 
   INLINE(Label()) {
     Unuse();
     UnuseNear();
   }
-  INLINE(~Label())                { ASSERT(!is_linked()); }
+  INLINE(~Label()) {
+    ASSERT(!is_linked());
+    ASSERT(!is_near_linked());
+  }
 
   INLINE(void Unuse())            { pos_ = 0; }
   INLINE(void UnuseNear())        { near_link_pos_ = 0; }
 
   INLINE(bool is_bound() const)  { return pos_ <  0; }
   INLINE(bool is_unused() const)  { return pos_ == 0 && near_link_pos_ == 0; }
   INLINE(bool is_linked() const)  { return pos_ >  0; }
   INLINE(bool is_near_linked() const) { return near_link_pos_ > 0; }
 
   // Returns the position of bound or linked labels. Cannot be used
@@ skipping 756 matching lines @@
  public:
   NullCallWrapper() { }
   virtual ~NullCallWrapper() { }
   virtual void BeforeCall(int call_size) const { }
   virtual void AfterCall() const { }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ASSEMBLER_H_