--- old/src/share/vm/gc_implementation/g1/heapRegion.hpp	2014-06-25 13:43:35.163498946 +0200
+++ new/src/share/vm/gc_implementation/g1/heapRegion.hpp	2014-06-25 13:43:35.055494542 +0200
@@ -127,8 +127,6 @@
   friend class VMStructs;
   HeapWord* _top;
  protected:
-  inline HeapWord* cas_allocate_inner(size_t size);
-  inline HeapWord* allocate_inner(size_t size);
   G1BlockOffsetArrayContigSpace _offsets;
   Mutex _par_alloc_lock;
   volatile unsigned _gc_time_stamp;
@@ -144,8 +142,16 @@
   G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray,
                            MemRegion mr);
 
-  inline void set_top(HeapWord* value) { _top = value; }
+  void set_top(HeapWord* value) { _top = value; }
   HeapWord* top() const { return _top; }
+
+ protected:
+  HeapWord** top_addr() { return &_top; }
+  // Allocation helpers (return NULL if full).
+  inline HeapWord* allocate_impl(size_t word_size, HeapWord* end_value);
+  inline HeapWord* par_allocate_impl(size_t word_size, HeapWord* end_value);
+
+ public:
   void reset_after_compaction() { set_top(compaction_top()); }
 
   size_t used() const { return byte_size(bottom(), top()); }
@@ -364,7 +370,11 @@
     ParMarkRootClaimValue      = 9
   };
 
+  // All allocated blocks are occupied by objects in a HeapRegion
   bool block_is_obj(const HeapWord* p) const;
+
+  // Returns the object size for all valid block starts
+  // and the amount of unallocated words if called on top()
   size_t block_size(const HeapWord* p) const;
 
   inline HeapWord* par_allocate_no_bot_updates(size_t word_size);