diff -r ad0621bda88a -r e1871d34a188 src/hotspot/share/gc/epsilon/epsilonHeap.hpp
--- a/src/hotspot/share/gc/epsilon/epsilonHeap.hpp	Thu Apr 26 18:16:16 2018 +0200
+++ b/src/hotspot/share/gc/epsilon/epsilonHeap.hpp	Thu Apr 26 18:46:01 2018 +0200
@@ -47,7 +47,10 @@
   size_t _last_heap_print;
   size_t _step_counter_update;
   size_t _step_heap_print;
+
 public:
+  static EpsilonHeap* heap();
+
   EpsilonHeap(EpsilonCollectorPolicy* p) :
           _policy(p),
           _memory_manager("Epsilon Heap", "") {};
@@ -60,52 +63,6 @@
     return "Epsilon";
   }
 
-  virtual jint initialize();
-
-  virtual void post_initialize();
-
-  virtual void initialize_serviceability();
-  virtual GrowableArray<GCMemoryManager*> memory_managers();
-  virtual GrowableArray<MemoryPool*> memory_pools();
-
-  static EpsilonHeap* heap();
-
-  virtual size_t capacity()     const { return _virtual_space.committed_size(); }
-  virtual size_t used()         const { return _space->used(); }
-  virtual size_t max_capacity() const { return _virtual_space.reserved_size(); }
-
-  virtual bool is_maximal_no_gc() const {
-    // No GC is going to happen, unless we are at capacity.
-    // At which point we will fail anyway.
-    return used() == capacity();
-  }
-
-  virtual bool is_in(const void* p) const { return _space->is_in(p); }
-
-  virtual bool is_scavengable(oop obj) {
-    // No GC is going to happen, therefore no objects ever move.
-    return false;
-  }
-
-  HeapWord* allocate_work(size_t size);
-  virtual HeapWord* mem_allocate(size_t size, bool* gc_overhead_limit_was_exceeded);
-  virtual HeapWord* allocate_new_tlab(size_t size);
-
-  // TLAB allocations
-  virtual bool supports_tlab_allocation()           const { return UseTLAB; }
-  virtual size_t tlab_capacity(Thread* thr)         const { return capacity(); }
-  virtual size_t tlab_used(Thread* thr)             const { return used(); }
-  virtual size_t max_tlab_size()                    const { return _max_tlab_size; }
-  virtual size_t unsafe_max_tlab_alloc(Thread* thr) const;
-
-  virtual void collect(GCCause::Cause cause);
-  virtual void do_full_collection(bool clear_all_soft_refs);
-
-  virtual AdaptiveSizePolicy* size_policy() {
-    // No such thing for Epsilon
-    return NULL;
-  }
-
   virtual CollectorPolicy* collector_policy() const {
     return _policy;
   }
@@ -114,51 +71,73 @@
     return &_soft_ref_policy;
   }
 
+  virtual jint initialize();
+  virtual void post_initialize();
+  virtual void initialize_serviceability();
+
+  virtual GrowableArray<GCMemoryManager*> memory_managers();
+  virtual GrowableArray<MemoryPool*> memory_pools();
+
+  virtual size_t max_capacity() const { return _virtual_space.reserved_size();  }
+  virtual size_t capacity()     const { return _virtual_space.committed_size(); }
+  virtual size_t used()         const { return _space->used(); }
+
+  virtual bool is_in(const void* p) const {
+    return _space->is_in(p);
+  }
+
+  virtual bool is_scavengable(oop obj) {
+    // No GC is going to happen, therefore no objects ever move.
+    return false;
+  }
+
+  virtual bool is_maximal_no_gc() const {
+    // No GC is going to happen. Return "we are at max", when we are about to fail.
+    return used() == capacity();
+  }
+
+  // Allocation
+  HeapWord* allocate_work(size_t size);
+  virtual HeapWord* mem_allocate(size_t size, bool* gc_overhead_limit_was_exceeded);
+  virtual HeapWord* allocate_new_tlab(size_t size);
+
+  // TLAB allocation
+  virtual bool supports_tlab_allocation()           const { return UseTLAB;        }
+  virtual size_t tlab_capacity(Thread* thr)         const { return capacity();     }
+  virtual size_t tlab_used(Thread* thr)             const { return used();         }
+  virtual size_t max_tlab_size()                    const { return _max_tlab_size; }
+  virtual size_t unsafe_max_tlab_alloc(Thread* thr) const;
+
+  virtual void collect(GCCause::Cause cause);
+  virtual void do_full_collection(bool clear_all_soft_refs);
+
+  // Heap walking support
+  virtual void safe_object_iterate(ObjectClosure* cl);
   virtual void object_iterate(ObjectClosure* cl) {
     safe_object_iterate(cl);
   }
 
-  virtual void safe_object_iterate(ObjectClosure* cl);
-
-  virtual HeapWord* block_start(const void* addr) const {
-    // No support for block parsing.
-    return NULL;
-  }
+  // No support for block parsing.
+  virtual HeapWord* block_start(const void* addr) const { return NULL;  }
+  virtual size_t block_size(const HeapWord* addr) const { return 0;     }
+  virtual bool block_is_obj(const HeapWord* addr) const { return false; }
 
-  virtual size_t block_size(const HeapWord* addr) const {
-    // No support for block parsing.
-    return 0;
-  }
+  // No GC threads
+  virtual void print_gc_threads_on(outputStream* st) const {}
+  virtual void gc_threads_do(ThreadClosure* tc) const {}
 
-  virtual bool block_is_obj(const HeapWord* addr) const {
-    // No support for block parsing.
-    return false;
-  }
+  // No heap verification
+  virtual void prepare_for_verify() {}
+  virtual void verify(VerifyOption option) {}
 
   virtual jlong millis_since_last_gc() {
     // Report time since the VM start
     return os::elapsed_counter() / NANOSECS_PER_MILLISEC;
   }
 
-  virtual void print_gc_threads_on(outputStream* st) const {
-    // No GC threads.
-  }
-
-  virtual void gc_threads_do(ThreadClosure* tc) const {
-    // No GC threads.
-  }
-
   virtual void print_on(outputStream* st) const;
   virtual void print_tracing_info() const;
 
-  virtual void prepare_for_verify() {
-    // No heap verification.
-  }
-
-  virtual void verify(VerifyOption option) {
-    // No heap verification.
-  }
-
 };
 
 #endif // SHARE_VM_GC_EPSILON_COLLECTEDHEAP_HPP