497 
 498   virtual void print_on_error(outputStream* st) const;
 499 
 500   // Print all GC threads (other than the VM thread)
 501   // used by this heap.
 502   virtual void print_gc_threads_on(outputStream* st) const = 0;
 503   // The default behavior is to call print_gc_threads_on() on tty.
 504   void print_gc_threads() {
 505     print_gc_threads_on(tty);
 506   }
 507   // Iterator for all GC threads (other than VM thread)
 508   virtual void gc_threads_do(ThreadClosure* tc) const = 0;
 509 
 510   // Print any relevant tracing info that flags imply.
 511   // Default implementation does nothing.
 512   virtual void print_tracing_info() const = 0;
 513 
 514   void print_heap_before_gc();
 515   void print_heap_after_gc();
 516 
 517   // An object is scavengable if its location may move during a scavenge.
 518   // (A scavenge is a GC which is not a full GC.)
 519   virtual bool is_scavengable(oop obj) = 0;
 520   // Registering and unregistering an nmethod (compiled code) with the heap.
 521   // Override with specific mechanism for each specialized heap type.
 522   virtual void register_nmethod(nmethod* nm) {}
 523   virtual void unregister_nmethod(nmethod* nm) {}
 524   virtual void flush_nmethod(nmethod* nm) {}
 525   virtual void verify_nmethod(nmethod* nmethod) {}
 526 
 527   void trace_heap_before_gc(const GCTracer* gc_tracer);
 528   void trace_heap_after_gc(const GCTracer* gc_tracer);
 529 
 530   // Heap verification
 531   virtual void verify(VerifyOption option) = 0;
 532 
 533   // Return true if concurrent phase control (via
 534   // request_concurrent_phase_control) is supported by this collector.
 535   // The default implementation returns false.
 536   virtual bool supports_concurrent_phase_control() const;
 537 
 538   // Request the collector enter the indicated concurrent phase, and
 539   // wait until it does so.  Supports WhiteBox testing.  Only one

 497 
 498   virtual void print_on_error(outputStream* st) const;
 499 
 500   // Print all GC threads (other than the VM thread)
 501   // used by this heap.
 502   virtual void print_gc_threads_on(outputStream* st) const = 0;
 503   // The default behavior is to call print_gc_threads_on() on tty.
 504   void print_gc_threads() {
 505     print_gc_threads_on(tty);
 506   }
 507   // Iterator for all GC threads (other than VM thread)
 508   virtual void gc_threads_do(ThreadClosure* tc) const = 0;
 509 
 510   // Print any relevant tracing info that flags imply.
 511   // Default implementation does nothing.
 512   virtual void print_tracing_info() const = 0;
 513 
 514   void print_heap_before_gc();
 515   void print_heap_after_gc();
 516 



 517   // Registering and unregistering an nmethod (compiled code) with the heap.
 518   // Override with specific mechanism for each specialized heap type.
 519   virtual void register_nmethod(nmethod* nm) {}
 520   virtual void unregister_nmethod(nmethod* nm) {}
 521   virtual void flush_nmethod(nmethod* nm) {}
 522   virtual void verify_nmethod(nmethod* nmethod) {}
 523 
 524   void trace_heap_before_gc(const GCTracer* gc_tracer);
 525   void trace_heap_after_gc(const GCTracer* gc_tracer);
 526 
 527   // Heap verification
 528   virtual void verify(VerifyOption option) = 0;
 529 
 530   // Return true if concurrent phase control (via
 531   // request_concurrent_phase_control) is supported by this collector.
 532   // The default implementation returns false.
 533   virtual bool supports_concurrent_phase_control() const;
 534 
 535   // Request the collector enter the indicated concurrent phase, and
 536   // wait until it does so.  Supports WhiteBox testing.  Only one