diff -r caf5eb7dd4a7 -r 882756847a04 hotspot/src/share/vm/memory/metaspaceShared.hpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/memory/metaspaceShared.hpp	Sat Sep 01 13:25:18 2012 -0400
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+#ifndef SHARE_VM_MEMORY_METASPACE_SHARED_HPP
+#define SHARE_VM_MEMORY_METASPACE_SHARED_HPP
+
+#include "memory/allocation.hpp"
+#include "memory/memRegion.hpp"
+#include "runtime/virtualspace.hpp"
+#include "utilities/exceptions.hpp"
+#include "utilities/macros.hpp"
+
+class FileMapInfo;
+
+// Class Data Sharing Support
+class MetaspaceShared : AllStatic {
+
+  // CDS support
+  static ReservedSpace* _shared_rs;
+  static int _max_alignment;
+
+ public:
+  enum {
+    vtbl_list_size = 17, // number of entries in the shared space vtable list.
+    num_virtuals = 200   // maximum number of virtual functions
+                         // If virtual functions are added to Metadata,
+                         // this number needs to be increased.  Also,
+                         // SharedMiscCodeSize will need to be increased.
+  };
+
+  enum {
+    ro = 0,  // read-only shared space in the heap
+    rw = 1,  // read-write shared space in the heap
+    md = 2,  // miscellaneous data for initializing tables, etc.
+    mc = 3,  // miscellaneous code - vtable replacement.
+    n_regions = 4
+  };
+
+  static void set_max_alignment(int alignment) KERNEL_RETURN;
+  static int max_alignment()                   KERNEL_RETURN_(0);
+
+  static void preload_and_dump(TRAPS) KERNEL_RETURN;
+  static ReservedSpace* shared_rs();
+  static void set_shared_rs(ReservedSpace* rs) KERNEL_RETURN;
+
+  static bool map_shared_spaces(FileMapInfo* mapinfo) KERNEL_RETURN_(false);
+  static void initialize_shared_spaces() KERNEL_RETURN;
+
+  // Return true if given address is in the mapped shared space.
+  static bool is_in_shared_space(const void* p) KERNEL_RETURN_(false);
+
+  static void generate_vtable_methods(void** vtbl_list,
+                                      void** vtable,
+                                      char** md_top, char* md_end,
+                                      char** mc_top, char* mc_end);
+  static void serialize(SerializeClosure* sc);
+
+  // JVM/TI RedefineClasses() support:
+  // Remap the shared readonly space to shared readwrite, private if
+  // sharing is enabled. Simply returns true if sharing is not enabled
+  // or if the remapping has already been done by a prior call.
+  static bool remap_shared_readonly_as_readwrite() KERNEL_RETURN_(true);
+
+  static void print_shared_spaces();
+};
+#endif // SHARE_VM_MEMORY_METASPACE_SHARED_HPP