jdk-24/hotspot/src/share/vm/oops/instanceMirrorKlass.cpp

/*
 * Copyright (c) 2011, 2015, 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.
 *
 */

#include "precompiled.hpp"
#include "classfile/javaClasses.hpp"
#include "classfile/systemDictionary.hpp"
#include "gc_interface/collectedHeap.inline.hpp"
#include "memory/iterator.inline.hpp"
#include "memory/oopFactory.hpp"
#include "memory/specialized_oop_closures.hpp"
#include "oops/instanceKlass.hpp"
#include "oops/instanceMirrorKlass.hpp"
#include "oops/instanceOop.hpp"
#include "oops/oop.inline.hpp"
#include "oops/symbol.hpp"
#include "runtime/handles.inline.hpp"
#include "utilities/macros.hpp"

int InstanceMirrorKlass::_offset_of_static_fields = 0;

int InstanceMirrorKlass::instance_size(KlassHandle k) {
  if (k() != NULL && k->oop_is_instance()) {
    return align_object_size(size_helper() + InstanceKlass::cast(k())->static_field_size());
  }
  return size_helper();
}

instanceOop InstanceMirrorKlass::allocate_instance(KlassHandle k, TRAPS) {
  // Query before forming handle.
  int size = instance_size(k);
  KlassHandle h_k(THREAD, this);
  instanceOop i = (instanceOop)CollectedHeap::obj_allocate(h_k, size, CHECK_NULL);

  // Since mirrors can be variable sized because of the static fields, store
  // the size in the mirror itself.
  java_lang_Class::set_oop_size(i, size);

  return i;
}

int InstanceMirrorKlass::oop_size(oop obj) const {
  return java_lang_Class::oop_size(obj);
}

int InstanceMirrorKlass::compute_static_oop_field_count(oop obj) {
  Klass* k = java_lang_Class::as_Klass(obj);
  if (k != NULL && k->oop_is_instance()) {
    return InstanceKlass::cast(k)->static_oop_field_count();
  }
  return 0;
}