--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/memory/heapShared.hpp	Sun Jul 08 12:43:05 2018 -0400
@@ -0,0 +1,134 @@
+/*
+ * Copyright (c) 2018, 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_HEAPSHARED_HPP
+#define SHARE_VM_MEMORY_HEAPSHARED_HPP
+
+#include "classfile/systemDictionary.hpp"
+#include "memory/universe.hpp"
+#include "oops/objArrayKlass.hpp"
+#include "oops/oop.hpp"
+#include "oops/typeArrayKlass.hpp"
+#include "utilities/growableArray.hpp"
+
+#if INCLUDE_CDS_JAVA_HEAP
+// A dump time sub-graph info for Klass _k. It includes the entry points
+// (static fields in _k's mirror) of the archived sub-graphs reachable
+// from _k's mirror. It also contains a list of Klasses of the objects
+// within the sub-graphs.
+class KlassSubGraphInfo: public CHeapObj<mtClass> {
+ private:
+  KlassSubGraphInfo* _next;
+  // The class that contains the static field(s) as the entry point(s)
+  // of archived object sub-graph(s).
+  Klass* _k;
+  // A list of classes need to be loaded and initialized before the archived
+  // object sub-graphs can be accessed at runtime.
+  GrowableArray<Klass*>* _subgraph_object_klasses;
+  // A list of _k's static fields as the entry points of archived sub-graphs.
+  // For each entry field, it is a pair of field_offset and field_value.
+  GrowableArray<juint>*  _subgraph_entry_fields;
+
+ public:
+  KlassSubGraphInfo(Klass* k, KlassSubGraphInfo* next) :
+    _next(next), _k(k),  _subgraph_object_klasses(NULL),
+    _subgraph_entry_fields(NULL) {}
+  ~KlassSubGraphInfo() {
+    if (_subgraph_object_klasses != NULL) {
+      delete _subgraph_object_klasses;
+    }
+    if (_subgraph_entry_fields != NULL) {
+      delete _subgraph_entry_fields;
+    }
+  };
+
+  KlassSubGraphInfo* next() { return _next; }
+  Klass* klass()            { return _k; }
+  GrowableArray<Klass*>* subgraph_object_klasses() {
+    return _subgraph_object_klasses;
+  }
+  GrowableArray<juint>*  subgraph_entry_fields() {
+    return _subgraph_entry_fields;
+  }
+  void add_subgraph_entry_field(int static_field_offset, oop v);
+  void add_subgraph_object_klass(Klass *orig_k, Klass *relocated_k);
+};
+
+// An archived record of object sub-graphs reachable from static
+// fields within _k's mirror. The record is reloaded from the archive
+// at runtime.
+class ArchivedKlassSubGraphInfoRecord {
+ private:
+  ArchivedKlassSubGraphInfoRecord* _next;
+  Klass* _k;
+
+  // contains pairs of field offset and value for each subgraph entry field
+  Array<juint>* _entry_field_records;
+
+  // klasses of objects in archived sub-graphs referenced from the entry points
+  // (static fields) in the containing class
+  Array<Klass*>* _subgraph_klasses;
+ public:
+  ArchivedKlassSubGraphInfoRecord() :
+    _next(NULL), _k(NULL), _entry_field_records(NULL), _subgraph_klasses(NULL) {}
+  void init(KlassSubGraphInfo* info);
+  Klass* klass() { return _k; }
+  ArchivedKlassSubGraphInfoRecord* next() { return _next; }
+  void set_next(ArchivedKlassSubGraphInfoRecord* next) { _next = next; }
+  Array<juint>*  entry_field_records() { return _entry_field_records; }
+  Array<Klass*>* subgraph_klasses() { return _subgraph_klasses; }
+};
+#endif // INCLUDE_CDS_JAVA_HEAP
+
+class HeapShared: AllStatic {
+ private:
+#if INCLUDE_CDS_JAVA_HEAP
+  // This is a list of subgraph infos built at dump time while
+  // archiving object subgraphs.
+  static KlassSubGraphInfo* _subgraph_info_list;
+
+  // Contains a list of ArchivedKlassSubGraphInfoRecords that is stored
+  // in the archive file and reloaded at runtime.
+  static int _num_archived_subgraph_info_records;
+  static Array<ArchivedKlassSubGraphInfoRecord>* _archived_subgraph_info_records;
+
+  // Archive object sub-graph starting from the given static field
+  // in Klass k's mirror.
+  static void archive_reachable_objects_from_static_field(
+    Klass* k, int field_ofset, BasicType field_type, TRAPS);
+
+  static KlassSubGraphInfo* find_subgraph_info(Klass *k);
+  static KlassSubGraphInfo* get_subgraph_info(Klass *k);
+  static int num_of_subgraph_infos();
+
+  static size_t build_archived_subgraph_info_records(int num_records);
+#endif // INCLUDE_CDS_JAVA_HEAP
+ public:
+  static char* read_archived_subgraph_infos(char* buffer) NOT_CDS_JAVA_HEAP_RETURN_(buffer);
+  static void write_archived_subgraph_infos() NOT_CDS_JAVA_HEAP_RETURN;
+  static void initialize_from_archived_subgraph(Klass* k) NOT_CDS_JAVA_HEAP_RETURN;
+
+  static void archive_module_graph_objects(Thread* THREAD) NOT_CDS_JAVA_HEAP_RETURN;
+};
+#endif // SHARE_VM_MEMORY_HEAPSHARED_HPP