33 
  34 // Base class for processing the contents of a SATB buffer.
  35 class SATBBufferClosure : public StackObj {
  36 protected:
  37   ~SATBBufferClosure() { }
  38 
  39 public:
  40   // Process the SATB entries in the designated buffer range.
  41   virtual void do_buffer(void** buffer, size_t size) = 0;
  42 };
  43 
  44 // A PtrQueue whose elements are (possibly stale) pointers to object heads.
  45 class SATBMarkQueue: public PtrQueue {
  46   friend class SATBMarkQueueSet;
  47 
  48 private:
  49   // Filter out unwanted entries from the buffer.
  50   void filter();
  51 
  52 public:
  53   SATBMarkQueue(SATBMarkQueueSet* qset, bool permanent = false);
  54 
  55   // Process queue entries and free resources.
  56   void flush();
  57 
  58   // Apply cl to the active part of the buffer.
  59   // Prerequisite: Must be at a safepoint.
  60   void apply_closure_and_empty(SATBBufferClosure* cl);
  61 
  62   // Overrides PtrQueue::should_enqueue_buffer(). See the method's
  63   // definition for more information.
  64   virtual bool should_enqueue_buffer();
  65 
  66 #ifndef PRODUCT
  67   // Helpful for debugging
  68   void print(const char* name);
  69   static void print(const char* name, void** buf, size_t index, size_t sz);
  70 #endif // PRODUCT
  71 
  72   // Compiler support.
  73   static ByteSize byte_offset_of_index() {

  33 
  34 // Base class for processing the contents of a SATB buffer.
  35 class SATBBufferClosure : public StackObj {
  36 protected:
  37   ~SATBBufferClosure() { }
  38 
  39 public:
  40   // Process the SATB entries in the designated buffer range.
  41   virtual void do_buffer(void** buffer, size_t size) = 0;
  42 };
  43 
  44 // A PtrQueue whose elements are (possibly stale) pointers to object heads.
  45 class SATBMarkQueue: public PtrQueue {
  46   friend class SATBMarkQueueSet;
  47 
  48 private:
  49   // Filter out unwanted entries from the buffer.
  50   void filter();
  51 
  52 public:
  53   SATBMarkQueue(SATBMarkQueueSet* qset = NULL, bool permanent = false);
  54 
  55   // Process queue entries and free resources.
  56   void flush();
  57 
  58   // Apply cl to the active part of the buffer.
  59   // Prerequisite: Must be at a safepoint.
  60   void apply_closure_and_empty(SATBBufferClosure* cl);
  61 
  62   // Overrides PtrQueue::should_enqueue_buffer(). See the method's
  63   // definition for more information.
  64   virtual bool should_enqueue_buffer();
  65 
  66 #ifndef PRODUCT
  67   // Helpful for debugging
  68   void print(const char* name);
  69   static void print(const char* name, void** buf, size_t index, size_t sz);
  70 #endif // PRODUCT
  71 
  72   // Compiler support.
  73   static ByteSize byte_offset_of_index() {