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 /*

  * Copyright (c) 2011, 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_OOPS_INSTANCEMIRRORKLASS_HPP

 #define SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP

 #include "classfile/systemDictionary.hpp"

 #include "oops/instanceKlass.hpp"

 #include "runtime/handles.hpp"

 // An instanceMirrorKlass is a specialized InstanceKlass for

 // java.lang.Class instances.  These instances are special because

 // they contain the static fields of the class in addition to the

 // normal fields of Class.  This means they are variable sized

 // instances and need special logic for computing their size and for

 // iteration of their oops.

 class instanceMirrorKlass: public InstanceKlass {

   friend class VMStructs;

   friend class InstanceKlass;

  private:

   static int _offset_of_static_fields;

   // Constructor

   instanceMirrorKlass(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:

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

   // Type testing

   bool oop_is_instanceMirror() const             { return true; }

   // Casting from Klass*

   static instanceMirrorKlass* cast(Klass* k) {

     assert(k->oop_is_instanceMirror(), "cast to instanceMirrorKlass");

     return (instanceMirrorKlass*) k;

   }

   // Returns the size of the instance including the extra static fields.

   virtual int oop_size(oop obj) const;

   // Static field offset is an offset into the Heap, should be converted by

   // based on UseCompressedOop for traversal

   static HeapWord* start_of_static_fields(oop obj) {

     return (HeapWord*)((intptr_t)obj + offset_of_static_fields());

   }

   static void init_offset_of_static_fields() {

     // Cache the offset of the static fields in the Class instance

     assert(_offset_of_static_fields == 0, "once");

     _offset_of_static_fields = instanceMirrorKlass::cast(SystemDictionary::Class_klass())->size_helper() << LogHeapWordSize;

   }

   static int offset_of_static_fields() {

     return _offset_of_static_fields;

   }

   int compute_static_oop_field_count(oop obj);

   // Given a Klass return the size of the instance

   int instance_size(KlassHandle k);

   // allocation

   instanceOop allocate_instance(KlassHandle k, TRAPS);

   // 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 InstanceMirrorKlass_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(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)

   ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)

 #ifndef SERIALGC

 #define InstanceMirrorKlass_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(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)

   ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)

 #endif // !SERIALGC

 };

 #endif // SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP