/*

 * Copyright (c) 1999, 2013, 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 "memory/universe.inline.hpp"

#include "runtime/reflectionUtils.hpp"

KlassStream::KlassStream(instanceKlassHandle klass, bool local_only,

                         bool classes_only, bool walk_defaults) {

  _klass = _base_klass = klass;

  _base_class_search_defaults = false;

  _defaults_checked = false;

  if (classes_only) {

    _interfaces = Universe::the_empty_klass_array();

  } else {

    _interfaces = klass->transitive_interfaces();

  }

  _interface_index = _interfaces->length();

  _local_only = local_only;

  _classes_only = classes_only;

  _walk_defaults = walk_defaults;

}

bool KlassStream::eos() {

  if (index() >= 0) return false;

  if (_local_only) return true;

  if (!_klass->is_interface() && _klass->super() != NULL) {

    // go up superclass chain (not for interfaces)

    _klass = _klass->super();

  // Next for method walks, walk default methods

  } else if (_walk_defaults && (_defaults_checked == false)  && (_base_klass->default_methods() != NULL)) {

      _base_class_search_defaults = true;

      _klass = _base_klass;

      _defaults_checked = true;

  } else {

    // Next walk transitive interfaces

    if (_interface_index > 0) {

      _klass = _interfaces->at(--_interface_index);

    } else {

      return true;

    }

  }

  _index = length();

  next();

  return eos();

}

GrowableArray<FilteredField*> *FilteredFieldsMap::_filtered_fields =

  new (ResourceObj::C_HEAP, mtInternal) GrowableArray<FilteredField*>(3,true);

void FilteredFieldsMap::initialize() {

  int offset;

  offset = java_lang_Throwable::get_backtrace_offset();

  _filtered_fields->append(new FilteredField(SystemDictionary::Throwable_klass(), offset));

  // The latest version of vm may be used with old jdk.

  if (JDK_Version::is_gte_jdk16x_version()) {

    // The following class fields do not exist in

    // previous version of jdk.

    offset = sun_reflect_ConstantPool::oop_offset();

    _filtered_fields->append(new FilteredField(SystemDictionary::reflect_ConstantPool_klass(), offset));

    offset = sun_reflect_UnsafeStaticFieldAccessorImpl::base_offset();

    _filtered_fields->append(new FilteredField(SystemDictionary::reflect_UnsafeStaticFieldAccessorImpl_klass(), offset));

  }

}

int FilteredFieldStream::field_count() {

  int numflds = 0;

  for (;!eos(); next()) {

    numflds++;

  }

  return numflds;

}