reflectionUtils.cpp revision 0:a61af66fc99e 
1/*
2 * Copyright 1999-2006 Sun Microsystems, Inc.  All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25#include "incls/_precompiled.incl"
26#include "incls/_reflectionUtils.cpp.incl"
27
28KlassStream::KlassStream(instanceKlassHandle klass, bool local_only, bool classes_only) {
29  _klass = klass;
30  if (classes_only) {
31    _interfaces = Universe::the_empty_system_obj_array();
32  } else {
33    _interfaces = klass->transitive_interfaces();
34  }
35  _interface_index = _interfaces->length();
36  _local_only = local_only;
37  _classes_only = classes_only;
38}
39
40bool KlassStream::eos() {
41  if (index() >= 0) return false;
42  if (_local_only) return true;
43  if (!_klass->is_interface() && _klass->super() != NULL) {
44    // go up superclass chain (not for interfaces)
45    _klass = _klass->super();
46  } else {
47    if (_interface_index > 0) {
48      _klass = klassOop(_interfaces->obj_at(--_interface_index));
49    } else {
50      return true;
51    }
52  }
53  _index = length();
54  next();
55  return eos();
56}
57
58
59GrowableArray<FilteredField*> *FilteredFieldsMap::_filtered_fields =
60  new (ResourceObj::C_HEAP) GrowableArray<FilteredField*>(3,true);
61
62
63void FilteredFieldsMap::initialize() {
64  int offset;
65  offset = java_lang_Throwable::get_backtrace_offset();
66  _filtered_fields->append(new FilteredField(SystemDictionary::throwable_klass(), offset));
67  // The latest version of vm may be used with old jdk.
68  if (JDK_Version::is_gte_jdk16x_version()) {
69    // The following class fields do not exist in
70    // previous version of jdk.
71    offset = sun_reflect_ConstantPool::cp_oop_offset();
72    _filtered_fields->append(new FilteredField(SystemDictionary::reflect_constant_pool_klass(), offset));
73    offset = sun_reflect_UnsafeStaticFieldAccessorImpl::base_offset();
74    _filtered_fields->append(new FilteredField(SystemDictionary::reflect_unsafe_static_field_accessor_impl_klass(), offset));
75  }
76}
77
78int FilteredFieldStream::field_count() {
79  int numflds = 0;
80  for (;!eos(); next()) {
81    numflds++;
82  }
83  return numflds;
84}
85