1 /*
   2  * Copyright (c) 1999, 2018, 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.hpp"
  28 #include "runtime/reflectionUtils.hpp"
  29 
  30 KlassStream::KlassStream(InstanceKlass* klass, bool local_only,
  31                          bool classes_only, bool walk_defaults) {
  32   _klass = _base_klass = klass;
  33   _base_class_search_defaults = false;
  34   _defaults_checked = false;
  35   if (classes_only) {
  36     _interfaces = Universe::the_empty_klass_array();
  37   } else {
  38     _interfaces = klass->transitive_interfaces();
  39   }
  40   _interface_index = _interfaces->length();
  41   _local_only = local_only;
  42   _classes_only = classes_only;
  43   _walk_defaults = walk_defaults;
  44 }
  45 
  46 bool KlassStream::eos() {
  47   if (index() >= 0) return false;
  48   if (_local_only) return true;
  49   if (!_klass->is_interface() && _klass->super() != NULL) {
  50     // go up superclass chain (not for interfaces)
  51     _klass = InstanceKlass::cast(_klass->super());
  52   // Next for method walks, walk default methods
  53   } else if (_walk_defaults && (_defaults_checked == false)  && (_base_klass->default_methods() != NULL)) {
  54       _base_class_search_defaults = true;
  55       _klass = _base_klass;
  56       _defaults_checked = true;
  57   } else {
  58     // Next walk transitive interfaces
  59     if (_interface_index > 0) {
  60       _klass = InstanceKlass::cast(_interfaces->at(--_interface_index));
  61     } else {
  62       return true;
  63     }
  64   }
  65   _index = length();
  66   next();
  67   return eos();
  68 }
  69 
  70 
  71 GrowableArray<FilteredField*> *FilteredFieldsMap::_filtered_fields =
  72   new (ResourceObj::C_HEAP, mtInternal) GrowableArray<FilteredField*>(3,true);
  73 
  74 
  75 void FilteredFieldsMap::initialize() {
  76   int offset = reflect_ConstantPool::oop_offset();
  77   _filtered_fields->append(new FilteredField(SystemDictionary::reflect_ConstantPool_klass(), offset));
  78   offset = reflect_UnsafeStaticFieldAccessorImpl::base_offset();
  79   _filtered_fields->append(new FilteredField(SystemDictionary::reflect_UnsafeStaticFieldAccessorImpl_klass(), offset));
  80 }
  81 
  82 int FilteredFieldStream::field_count() {
  83   int numflds = 0;
  84   for (;!eos(); next()) {
  85     numflds++;
  86   }
  87   return numflds;
  88 }