--- old/src/share/vm/runtime/arguments.hpp	2013-08-28 14:34:31.700178713 +0200
+++ new/src/share/vm/runtime/arguments.hpp	2013-08-28 14:34:31.640178715 +0200
@@ -263,6 +263,9 @@
   // Option flags
   static bool   _has_profile;
   static const char*  _gc_log_filename;
+  // computed value for the largest heap alignment needed for any GC
+  static size_t  _largest_heap_alignment;
+
   static uintx  _min_heap_size;
 
   // -Xrun arguments
@@ -308,6 +311,7 @@
   // Garbage-First (UseG1GC)
   static void set_g1_gc_flags();
   // GC ergonomics
+  static void set_largest_max_heap_alignment();
   static void set_use_compressed_oops();
   static void set_use_compressed_klass_ptrs();
   static void set_ergonomics_flags();
@@ -428,6 +432,10 @@
   // Used by os_solaris
   static bool process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized);
 
+  static size_t largest_heap_alignment()       { return _largest_heap_alignment; }
+  // return the maximum size a heap with compressed oops can take
+  static size_t max_heap_for_compressed_oops();
+
   // return a char* array containing all options
   static char** jvm_flags_array()          { return _jvm_flags_array; }
   static char** jvm_args_array()           { return _jvm_args_array; }