diff -r b2b4df384c83 -r 912c55e702d6 src/hotspot/share/gc/shared/genCollectedHeap.hpp
--- a/src/hotspot/share/gc/shared/genCollectedHeap.hpp	Fri Nov 10 19:10:54 2017 +0100
+++ b/src/hotspot/share/gc/shared/genCollectedHeap.hpp	Thu Nov 30 17:13:33 2017 +0100
@@ -83,6 +83,12 @@
                           bool run_verification, bool clear_soft_refs,
                           bool restore_marks_for_biased_locking);
 
+  // Reserve aligned space for the heap as needed by the contained generations.
+  char* allocate(size_t alignment, ReservedSpace* heap_rs);
+
+  // Initialize ("weak") refs processing support
+  void ref_processing_init();
+
 protected:
 
   // The set of potentially parallel tasks in root scanning.
@@ -134,31 +140,18 @@
   // we absolutely __must__ clear soft refs?
   bool must_clear_all_soft_refs();
 
+  GenCollectedHeap(GenCollectorPolicy *policy);
+
+  virtual void check_gen_kinds() = 0;
+
 public:
-  GenCollectedHeap(GenCollectorPolicy *policy);
 
   // Returns JNI_OK on success
   virtual jint initialize();
 
-  // Reserve aligned space for the heap as needed by the contained generations.
-  char* allocate(size_t alignment, ReservedSpace* heap_rs);
-
   // Does operations required after initialization has been done.
   void post_initialize();
 
-  virtual void check_gen_kinds();
-
-  // Initialize ("weak") refs processing support
-  virtual void ref_processing_init();
-
-  virtual Name kind() const {
-    return CollectedHeap::GenCollectedHeap;
-  }
-
-  virtual const char* name() const {
-    return "Serial";
-  }
-
   Generation* young_gen() const { return _young_gen; }
   Generation* old_gen()   const { return _old_gen; }
 
@@ -215,11 +208,6 @@
   // assertion checking or verification only.
   bool is_in(const void* p) const;
 
-  // override
-  virtual bool is_in_closed_subset(const void* p) const {
-    return is_in(p);
-  }
-
   // Returns true if the reference is to an object in the reserved space
   // for the young generation.
   // Assumes the the young gen address range is less than that of the old gen.
@@ -286,10 +274,6 @@
     return true;
   }
 
-  virtual bool card_mark_must_follow_store() const {
-    return false;
-  }
-
   // We don't need barriers for stores to objects in the
   // young gen and, a fortiori, for initializing stores to
   // objects therein. This applies to DefNew+Tenured and ParNew+CMS