66   } _metadata;
  67 
  68   // Fast access to barrier set. Must be initialized.
  69   static BarrierSet* _bs;
  70 
  71  public:
  72   markOop  mark()      const { return _mark; }
  73   markOop* mark_addr() const { return (markOop*) &_mark; }
  74 
  75   void set_mark(volatile markOop m) { _mark = m; }
  76 
  77   inline void release_set_mark(markOop m);
  78   inline markOop cas_set_mark(markOop new_mark, markOop old_mark);
  79 
  80   // Used only to re-initialize the mark word (e.g., of promoted
  81   // objects during a GC) -- requires a valid klass pointer
  82   inline void init_mark();
  83 
  84   inline Klass* klass() const;
  85   inline Klass* klass_or_null() const volatile;

  86   inline Klass** klass_addr();
  87   inline narrowKlass* compressed_klass_addr();
  88 
  89   inline void set_klass(Klass* k);
  90   inline void release_set_klass(Klass* k);
  91 
  92   // For klass field compression
  93   inline int klass_gap() const;
  94   inline void set_klass_gap(int z);
  95   // For when the klass pointer is being used as a linked list "next" field.
  96   inline void set_klass_to_list_ptr(oop k);
  97   inline oop list_ptr_from_klass();
  98 
  99   // size of object header, aligned to platform wordSize
 100   static int header_size() { return sizeof(oopDesc)/HeapWordSize; }
 101 
 102   // Returns whether this is an instance of k or an instance of a subclass of k
 103   inline bool is_a(Klass* k) const;
 104 
 105   // Returns the actual oop size of the object

  66   } _metadata;
  67 
  68   // Fast access to barrier set. Must be initialized.
  69   static BarrierSet* _bs;
  70 
  71  public:
  72   markOop  mark()      const { return _mark; }
  73   markOop* mark_addr() const { return (markOop*) &_mark; }
  74 
  75   void set_mark(volatile markOop m) { _mark = m; }
  76 
  77   inline void release_set_mark(markOop m);
  78   inline markOop cas_set_mark(markOop new_mark, markOop old_mark);
  79 
  80   // Used only to re-initialize the mark word (e.g., of promoted
  81   // objects during a GC) -- requires a valid klass pointer
  82   inline void init_mark();
  83 
  84   inline Klass* klass() const;
  85   inline Klass* klass_or_null() const volatile;
  86   inline Klass* klass_or_null_acquire() const volatile;
  87   inline Klass** klass_addr();
  88   inline narrowKlass* compressed_klass_addr();
  89 
  90   inline void set_klass(Klass* k);
  91   inline void release_set_klass(Klass* k);
  92 
  93   // For klass field compression
  94   inline int klass_gap() const;
  95   inline void set_klass_gap(int z);
  96   // For when the klass pointer is being used as a linked list "next" field.
  97   inline void set_klass_to_list_ptr(oop k);
  98   inline oop list_ptr_from_klass();
  99 
 100   // size of object header, aligned to platform wordSize
 101   static int header_size() { return sizeof(oopDesc)/HeapWordSize; }
 102 
 103   // Returns whether this is an instance of k or an instance of a subclass of k
 104   inline bool is_a(Klass* k) const;
 105 
 106   // Returns the actual oop size of the object