--- old/src/share/vm/runtime/vmStructs.cpp	2015-01-28 18:28:54.000000000 +0100
+++ new/src/share/vm/runtime/vmStructs.cpp	2015-01-28 18:28:54.000000000 +0100
@@ -550,6 +550,8 @@
   nonstatic_field(GenerationSpec,              _max_size,                                     size_t)                                \
                                                                                                                                      \
     static_field(GenCollectedHeap,             _gch,                                          GenCollectedHeap*)                     \
+  nonstatic_field(GenCollectedHeap,            _young_gen,                                    Generation*)                           \
+  nonstatic_field(GenCollectedHeap,            _old_gen,                                      Generation*)                           \
  nonstatic_field(GenCollectedHeap,             _n_gens,                                       int)                                   \
   nonstatic_field(GenCollectedHeap,            _gen_specs,                                    GenerationSpec**)                      \
                                                                                                                                      \