--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/oops/instanceRefKlass.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 1997, 2017, 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_OOPS_INSTANCEREFKLASS_HPP
+#define SHARE_VM_OOPS_INSTANCEREFKLASS_HPP
+
+#include "gc/shared/specialized_oop_closures.hpp"
+#include "oops/instanceKlass.hpp"
+#include "utilities/macros.hpp"
+
+class ClassFileParser;
+
+// An InstanceRefKlass is a specialized InstanceKlass for Java
+// classes that are subclasses of java/lang/ref/Reference.
+//
+// These classes are used to implement soft/weak/final/phantom
+// references and finalization, and need special treatment by the
+// garbage collector.
+//
+// During GC discovered reference objects are added (chained) to one
+// of the four lists below, depending on the type of reference.
+// The linked occurs through the next field in class java/lang/ref/Reference.
+//
+// Afterwards, the discovered references are processed in decreasing
+// order of reachability. Reference objects eligible for notification
+// are linked to the static pending_list in class java/lang/ref/Reference,
+// and the pending list lock object in the same class is notified.
+
+
+class InstanceRefKlass: public InstanceKlass {
+  friend class InstanceKlass;
+ private:
+  InstanceRefKlass(const ClassFileParser& parser) : InstanceKlass(parser, InstanceKlass::_misc_kind_reference) {}
+
+ public:
+  InstanceRefKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
+
+  // GC specific object visitors
+  //
+#if INCLUDE_ALL_GCS
+  // Parallel Scavenge
+  void oop_ps_push_contents(  oop obj, PSPromotionManager* pm);
+  // Parallel Compact
+  void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
+  void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);
+#endif
+
+  // Oop fields (and metadata) iterators
+  //  [nv = true]  Use non-virtual calls to do_oop_nv.
+  //  [nv = false] Use virtual calls to do_oop.
+  //
+  // The InstanceRefKlass iterators also support reference processing.
+
+
+  // Forward iteration
+private:
+  // Iterate over all oop fields and metadata.
+  template <bool nv, class OopClosureType>
+  inline void oop_oop_iterate(oop obj, OopClosureType* closure);
+
+  // Reverse iteration
+#if INCLUDE_ALL_GCS
+  // Iterate over all oop fields and metadata.
+  template <bool nv, class OopClosureType>
+  inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
+#endif // INCLUDE_ALL_GCS
+
+  // Bounded range iteration
+  // Iterate over all oop fields and metadata.
+  template <bool nv, class OopClosureType>
+  inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
+
+  // Reference processing part of the iterators.
+
+  // Specialized for [T = oop] or [T = narrowOop].
+  template <bool nv, typename T, class OopClosureType, class Contains>
+  inline void oop_oop_iterate_ref_processing_specialized(oop obj, OopClosureType* closure, Contains& contains);
+
+  // Only perform reference processing if the referent object is within mr.
+  template <bool nv, class OopClosureType>
+  inline void oop_oop_iterate_ref_processing_bounded(oop obj, OopClosureType* closure, MemRegion mr);
+
+  // Reference processing
+  template <bool nv, class OopClosureType>
+  inline void oop_oop_iterate_ref_processing(oop obj, OopClosureType* closure);
+
+  // Building blocks for specialized handling.
+  template <bool nv, typename T, class OopClosureType, class Contains>
+  static void do_referent(oop obj, OopClosureType* closure, Contains& contains);
+
+  template <bool nv, typename T, class OopClosureType, class Contains>
+  static void do_next(oop obj, OopClosureType* closure, Contains& contains);
+
+  template <bool nv, typename T, class OopClosureType, class Contains>
+  static void do_discovered(oop obj, OopClosureType* closure, Contains& contains);
+
+  template <typename T, class OopClosureType>
+  static bool try_discover(oop obj, ReferenceType type, OopClosureType* closure);
+
+  // Do discovery while handling InstanceRefKlasses. Reference discovery
+  // is only done if the closure provides a ReferenceProcessor.
+  template <bool nv, typename T, class OopClosureType, class Contains>
+  static void oop_oop_iterate_discovery(oop obj, ReferenceType type, OopClosureType* closure, Contains& contains);
+
+  // Used for a special case in G1 where the closure needs to be applied
+  // to the discovered field. Reference discovery is also done if the
+  // closure provides a ReferenceProcessor.
+  template <bool nv, typename T, class OopClosureType, class Contains>
+  static void oop_oop_iterate_discovered_and_discovery(oop obj, ReferenceType type, OopClosureType* closure, Contains& contains);
+
+  // Apply the closure to all fields. No reference discovery is done.
+  template <bool nv, typename T, class OopClosureType, class Contains>
+  static void oop_oop_iterate_fields(oop obj, OopClosureType* closure, Contains& contains);
+
+  template <typename T>
+  static void trace_reference_gc(const char *s, oop obj) NOT_DEBUG_RETURN;
+
+ public:
+
+  ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
+  ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
+
+#if INCLUDE_ALL_GCS
+  ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
+  ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
+#endif // INCLUDE_ALL_GCS
+
+  // Update non-static oop maps so 'referent', 'nextPending' and
+  // 'discovered' will look like non-oops
+  static void update_nonstatic_oop_maps(Klass* k);
+
+ public:
+  // Verification
+  void oop_verify_on(oop obj, outputStream* st);
+};
+
+#endif // SHARE_VM_OOPS_INSTANCEREFKLASS_HPP