reflectionUtils.cpp revision 3465:d2a62e0f25eb 
1/*
2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include "precompiled.hpp"
26#include "classfile/javaClasses.hpp"
27#include "memory/universe.inline.hpp"
28#include "runtime/reflectionUtils.hpp"
29
30KlassStream::KlassStream(instanceKlassHandle klass, bool local_only, bool classes_only) {
31  _klass = klass;
32  if (classes_only) {
33    _interfaces = Universe::the_empty_system_obj_array();
34  } else {
35    _interfaces = klass->transitive_interfaces();
36  }
37  _interface_index = _interfaces->length();
38  _local_only = local_only;
39  _classes_only = classes_only;
40}
41
42bool KlassStream::eos() {
43  if (index() >= 0) return false;
44  if (_local_only) return true;
45  if (!_klass->is_interface() && _klass->super() != NULL) {
46    // go up superclass chain (not for interfaces)
47    _klass = _klass->super();
48  } else {
49    if (_interface_index > 0) {
50      _klass = klassOop(_interfaces->obj_at(--_interface_index));
51    } else {
52      return true;
53    }
54  }
55  _index = length();
56  next();
57  return eos();
58}
59
60
61GrowableArray<FilteredField*> *FilteredFieldsMap::_filtered_fields =
62  new (ResourceObj::C_HEAP, mtInternal) GrowableArray<FilteredField*>(3,true);
63
64
65void FilteredFieldsMap::initialize() {
66  int offset;
67  offset = java_lang_Throwable::get_backtrace_offset();
68  _filtered_fields->append(new FilteredField(SystemDictionary::Throwable_klass(), offset));
69  // The latest version of vm may be used with old jdk.
70  if (JDK_Version::is_gte_jdk16x_version()) {
71    // The following class fields do not exist in
72    // previous version of jdk.
73    offset = sun_reflect_ConstantPool::cp_oop_offset();
74    _filtered_fields->append(new FilteredField(SystemDictionary::reflect_ConstantPool_klass(), offset));
75    offset = sun_reflect_UnsafeStaticFieldAccessorImpl::base_offset();
76    _filtered_fields->append(new FilteredField(SystemDictionary::reflect_UnsafeStaticFieldAccessorImpl_klass(), offset));
77  }
78}
79
80int FilteredFieldStream::field_count() {
81  int numflds = 0;
82  for (;!eos(); next()) {
83    numflds++;
84  }
85  return numflds;
86}
87