--- old/src/share/vm/gc/g1/g1CollectedHeap.hpp	2017-06-08 11:33:20.089737075 +0200
+++ new/src/share/vm/gc/g1/g1CollectedHeap.hpp	2017-06-08 11:33:19.965732177 +0200
@@ -87,6 +87,7 @@
 class WorkGang;
 class G1Allocator;
 class G1ArchiveAllocator;
+class G1FullGCScope;
 class G1HeapVerifier;
 class G1HeapSizingPolicy;
 
@@ -510,6 +511,15 @@
                                       AllocationContext_t context,
                                       bool* succeeded);
 private:
+  // Internal helpers used during full GC to split it up to
+  // increase readability.
+  void do_full_collection_inner(G1FullGCScope* scope);
+  void abort_concurrent_cycle();
+  void prepare_heap_for_full_collection();
+  void reset_card_cache_and_queue();
+  void verify_before_full_collection(bool explicit_gc);
+  void verify_after_full_collection();
+
   // Helper method for satisfy_failed_allocation()
   HeapWord* satisfy_failed_allocation_helper(size_t word_size,
                                              AllocationContext_t context,