never@2658: /*
never@2658:  * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
never@2658:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
never@2658:  *
never@2658:  * This code is free software; you can redistribute it and/or modify it
never@2658:  * under the terms of the GNU General Public License version 2 only, as
never@2658:  * published by the Free Software Foundation.
never@2658:  *
never@2658:  * This code is distributed in the hope that it will be useful, but WITHOUT
never@2658:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
never@2658:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
never@2658:  * version 2 for more details (a copy is included in the LICENSE file that
never@2658:  * accompanied this code).
never@2658:  *
never@2658:  * You should have received a copy of the GNU General Public License version
never@2658:  * 2 along with this work; if not, write to the Free Software Foundation,
never@2658:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
never@2658:  *
never@2658:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
never@2658:  * or visit www.oracle.com if you need additional information or have any
never@2658:  * questions.
never@2658:  *
never@2658:  */
never@2658: 
never@2658: #ifndef SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP
never@2658: #define SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP
never@2658: 
never@2658: #include "oops/instanceKlass.hpp"
never@2658: 
never@2658: // An instanceMirrorKlass is a specialized instanceKlass for
never@2658: // java.lang.Class instances.  These instances are special because
never@2658: // they contain the static fields of the class in addition to the
never@2658: // normal fields of Class.  This means they are variable sized
never@2658: // instances and need special logic for computing their size and for
never@2658: // iteration of their oops.
never@2658: 
never@2658: 
never@2658: class instanceMirrorKlass: public instanceKlass {
never@2693:   friend class VMStructs;
never@2693: 
never@2658:  private:
never@2658:   static int _offset_of_static_fields;
never@2658: 
never@2658:  public:
never@2658:   // Type testing
never@2658:   bool oop_is_instanceMirror() const             { return true; }
never@2658: 
never@2658:   // Casting from klassOop
never@2658:   static instanceMirrorKlass* cast(klassOop k) {
never@2658:     assert(k->klass_part()->oop_is_instanceMirror(), "cast to instanceMirrorKlass");
never@2658:     return (instanceMirrorKlass*) k->klass_part();
never@2658:   }
never@2658: 
never@2658:   // Returns the size of the instance including the extra static fields.
never@2658:   virtual int oop_size(oop obj) const;
never@2658: 
never@2658:   // Static field offset is an offset into the Heap, should be converted by
never@2658:   // based on UseCompressedOop for traversal
never@2658:   static HeapWord* start_of_static_fields(oop obj) {
never@2658:     return (HeapWord*)((intptr_t)obj + offset_of_static_fields());
never@2658:   }
never@2658: 
never@2658:   static void init_offset_of_static_fields() {
never@2658:     // Cache the offset of the static fields in the Class instance
never@2658:     assert(_offset_of_static_fields == 0, "once");
never@2658:     _offset_of_static_fields = instanceMirrorKlass::cast(SystemDictionary::Class_klass())->size_helper() << LogHeapWordSize;
never@2658:   }
never@2658: 
never@2658:   static int offset_of_static_fields() {
never@2658:     return _offset_of_static_fields;
never@2658:   }
never@2658: 
never@2658:   int compute_static_oop_field_count(oop obj);
never@2658: 
never@2658:   // Given a Klass return the size of the instance
never@2658:   int instance_size(KlassHandle k);
never@2658: 
never@2658:   // allocation
never@2658:   DEFINE_ALLOCATE_PERMANENT(instanceMirrorKlass);
never@2658:   instanceOop allocate_instance(KlassHandle k, TRAPS);
never@2658: 
never@2658:   // Garbage collection
never@2658:   int  oop_adjust_pointers(oop obj);
never@2658:   void oop_follow_contents(oop obj);
never@2658: 
never@2658:   // Parallel Scavenge and Parallel Old
never@2658:   PARALLEL_GC_DECLS
never@2658: 
never@2658:   int oop_oop_iterate(oop obj, OopClosure* blk) {
never@2658:     return oop_oop_iterate_v(obj, blk);
never@2658:   }
never@2658:   int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
never@2658:     return oop_oop_iterate_v_m(obj, blk, mr);
never@2658:   }
never@2658: 
never@2658: #define InstanceMirrorKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix)           \
never@2658:   int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk);                       \
never@2658:   int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr);
never@2658: 
never@2658:   ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)
never@2658:   ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)
never@2658: 
never@2658: #ifndef SERIALGC
never@2658: #define InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
never@2658:   int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
never@2658: 
never@2658:   ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
never@2658:   ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
never@2658: #endif // !SERIALGC
never@2658: };
never@2658: 
never@2658: #endif // SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP