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 /*

  * Copyright (c) 1997, 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

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 #ifndef SHARE_VM_OOPS_INSTANCEREFKLASS_HPP

 #define SHARE_VM_OOPS_INSTANCEREFKLASS_HPP

 #include "oops/instanceKlass.hpp"

 // 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;

   // Constructor

   InstanceRefKlass(int vtable_len, int itable_len, int static_field_size, int nonstatic_oop_map_size, ReferenceType rt, AccessFlags access_flags, bool is_anonymous)

     : InstanceKlass(vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt, access_flags, is_anonymous) {}

  public:

   InstanceRefKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }

   // Type testing

   bool oop_is_instanceRef() const             { return true; }

   // Casting from Klass*

   static InstanceRefKlass* cast(Klass* k) {

     assert(k->oop_is_instanceRef(), "cast to InstanceRefKlass");

     return (InstanceRefKlass*) k;

   }

   // Garbage collection

   int  oop_adjust_pointers(oop obj);

   void oop_follow_contents(oop obj);

   // Parallel Scavenge and Parallel Old

   PARALLEL_GC_DECLS

   int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {

     return oop_oop_iterate_v(obj, blk);

   }

   int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {

     return oop_oop_iterate_v_m(obj, blk, mr);

   }

 #define InstanceRefKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix)                \

   int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk);                         \

   int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr);

   ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DECL)

   ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DECL)

 #ifndef SERIALGC

 #define InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix)      \

   int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);

   ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)

   ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)

 #endif // !SERIALGC

   static void release_and_notify_pending_list_lock(BasicLock *pending_list_basic_lock);

   static void acquire_pending_list_lock(BasicLock *pending_list_basic_lock);

   static bool owns_pending_list_lock(JavaThread* thread);

   // 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