src/hotspot/share/gc/shenandoah/shenandoahMarkCompact.hpp

*** 48,62 ****
--- 48,70 ----
   * Parallelization is handled by assigning each GC worker the slice of the heap (the set of regions)
   * where it does sliding compaction, without interfering with other threads.
   */
  
  class ShenandoahMarkCompact : public CHeapObj<mtGC> {
+   friend class ShenandoahPrepareForCompactionObjectClosure;
  private:
    GCTimer* _gc_timer;
  
+   Stack<markOop, mtGC> _preserved_mark_stack;
+   Stack<oop, mtGC> _preserved_oop_stack;
+   Mutex _preserved_mark_lock;
+ 
  public:
+   ShenandoahMarkCompact() : _gc_timer(NULL), _preserved_mark_stack(), _preserved_oop_stack(),
+                             _preserved_mark_lock(Mutex::leaf, "Shenandoah Preserved Marks Lock", false, Mutex::_safepoint_check_never) {}
    void initialize(GCTimer* gc_timer);
+ 
    void do_it(GCCause::Cause gc_cause);
  
  private:
    void phase1_mark_heap();
    void phase2_calculate_target_addresses(ShenandoahHeapRegionSet** worker_slices);
*** 64,71 ****
--- 72,82 ----
    void phase4_compact_objects(ShenandoahHeapRegionSet** worker_slices);
  
    void calculate_target_humongous_objects();
    void compact_humongous_objects();
  
+   void preserve_mark(oop obj);
+   void restore_marks();
+   void adjust_marks();
  };
  
  #endif // SHARE_GC_SHENANDOAH_SHENANDOAHMARKCOMPACT_HPP