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

@@ -35,35 +35,44 @@
  
  // Use ShenandoahReentrantLock as ShenandoahNMethodLock
  typedef ShenandoahReentrantLock<ShenandoahSimpleLock> ShenandoahNMethodLock;
  typedef ShenandoahLocker<ShenandoahNMethodLock>       ShenandoahNMethodLocker;
  
+ struct ShenandoahNMethodBarrier {
+   address _barrier_pc;
+   address _stub_addr;
+ };
+ 
  // ShenandoahNMethod tuple records the internal locations of oop slots within reclocation stream in
  // the nmethod. This allows us to quickly scan the oops without doing the nmethod-internal scans,
  // that sometimes involves parsing the machine code. Note it does not record the oops themselves,
  // because it would then require handling these tuples as the new class of roots.
  class ShenandoahNMethod : public CHeapObj<mtGC> {
  private:
    nmethod* const          _nm;
    oop**                   _oops;
    int                     _oops_count;
+   ShenandoahNMethodBarrier* _barriers;
+   int                     _barriers_count;
    bool                    _has_non_immed_oops;
    bool                    _unregistered;
    ShenandoahNMethodLock   _lock;
    ShenandoahNMethodLock   _ic_lock;
  
  public:
-   ShenandoahNMethod(nmethod *nm, GrowableArray<oop*>& oops, bool has_non_immed_oops);
+   ShenandoahNMethod(nmethod *nm, GrowableArray<oop*>& oops, bool has_non_immed_oops, GrowableArray<ShenandoahNMethodBarrier>& barriers);
    ~ShenandoahNMethod();
  
    inline nmethod* nm() const;
    inline ShenandoahNMethodLock* lock();
    inline ShenandoahNMethodLock* ic_lock();
    inline void oops_do(OopClosure* oops, bool fix_relocations = false);
    // Update oops when the nmethod is re-registered
    void update();
  
+   void update_barriers();
+ 
    inline bool is_unregistered() const;
  
    static ShenandoahNMethod* for_nmethod(nmethod* nm);
    static inline ShenandoahNMethodLock* lock_for_nmethod(nmethod* nm);
    static inline ShenandoahNMethodLock* ic_lock_for_nmethod(nmethod* nm);

@@ -77,11 +86,11 @@
  
    void assert_correct() NOT_DEBUG_RETURN;
    void assert_same_oops() NOT_DEBUG_RETURN;
  
  private:
-   static void detect_reloc_oops(nmethod* nm, GrowableArray<oop*>& oops, bool& _has_non_immed_oops);
+   static void parse(nmethod* nm, GrowableArray<oop*>& oops, bool& _has_non_immed_oops, GrowableArray<ShenandoahNMethodBarrier>& barriers);
  };
  
  class ShenandoahNMethodTable;
  
  // ShenandoahNMethodList holds registered nmethod data. The list is reference counted.