--- old/src/share/vm/gc/g1/heapRegionManager.hpp	2015-05-27 14:31:01.888282384 -0400
+++ new/src/share/vm/gc/g1/heapRegionManager.hpp	2015-05-27 14:31:01.284247967 -0400
@@ -150,10 +150,17 @@
   // is valid.
   inline HeapRegion* at(uint index) const;
 
+  // Return the HeapRegion at the given index, or NULL.
+  inline HeapRegion* at_or_null(uint index) const;
+
   // If addr is within the committed space return its corresponding
   // HeapRegion, otherwise return NULL.
   inline HeapRegion* addr_to_region(HeapWord* addr) const;
 
+  // If addr is within the maximum heap space, return its corresponding
+  // HeapRegion index.
+  inline uint addr_to_index(HeapWord* addr) const;
+
   // Insert the given region into the free region list.
   inline void insert_into_free_list(HeapRegion* hr);
 
@@ -221,6 +228,9 @@
 
   HeapRegion* next_region_in_heap(const HeapRegion* r) const;
 
+  // Find the highest available empty or uncommitted region in the reserved heap.
+  uint find_highest_available(bool* expanded);
+
   // Apply blk->doHeapRegion() on all committed regions in address order,
   // terminating the iteration early if doHeapRegion() returns true.
   void iterate(HeapRegionClosure* blk) const;