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instanceMirrorKlass.hpp
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instanceMirrorKlass.hpp
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/*
* Copyright (c) 2011, 2020, 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_OOPS_INSTANCEMIRRORKLASS_HPP
#define SHARE_OOPS_INSTANCEMIRRORKLASS_HPP
#include "classfile/systemDictionary.hpp"
#include "oops/instanceKlass.hpp"
#include "runtime/handles.hpp"
#include "utilities/macros.hpp"
class ClassFileParser;
// 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;
public:
static const KlassID ID = InstanceMirrorKlassID;
private:
static int _offset_of_static_fields;
InstanceMirrorKlass(const ClassFileParser& parser) : InstanceKlass(parser, InstanceKlass::_misc_kind_mirror, ID) {}
public:
InstanceMirrorKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
static InstanceMirrorKlass* cast(Klass* k) {
return const_cast<InstanceMirrorKlass*>(cast(const_cast<const Klass*>(k)));
}
static const InstanceMirrorKlass* cast(const Klass* k) {
assert(InstanceKlass::cast(k)->is_mirror_instance_klass(), "cast to InstanceMirrorKlass");
return static_cast<const 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*)(cast_from_oop<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(Klass* k);
// allocation
instanceOop allocate_instance(Klass* k, TRAPS);
static void serialize_offsets(class SerializeClosure* f) NOT_CDS_RETURN;
// Oop fields (and metadata) iterators
//
// The InstanceMirrorKlass iterators also visit the hidden Klass pointer.
// Iterate over the static fields.
template <typename T, class OopClosureType>
inline void oop_oop_iterate_statics(oop obj, OopClosureType* closure);
// Forward iteration
// Iterate over the oop fields and metadata.
template <typename T, class OopClosureType>
inline void oop_oop_iterate(oop obj, OopClosureType* closure);
// Reverse iteration
// Iterate over the oop fields and metadata.
template <typename T, class OopClosureType>
inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
// Bounded range iteration
// Iterate over the oop fields and metadata.
template <typename T, class OopClosureType>
inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
private:
// Iterate over the static fields.
template <typename T, class OopClosureType>
inline void oop_oop_iterate_statics_bounded(oop obj, OopClosureType* closure, MemRegion mr);
};
#endif // SHARE_OOPS_INSTANCEMIRRORKLASS_HPP