jdk8-mips64-public/hotspot: src/share/vm/runtime/reflectionUtils.cpp@581e70386ec9

     1 /*

     2  * Copyright (c) 1999, 2013, 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  */

    25 #include "precompiled.hpp"

    26 #include "classfile/javaClasses.hpp"

    27 #include "memory/universe.inline.hpp"

    28 #include "runtime/reflectionUtils.hpp"

    30 KlassStream::KlassStream(instanceKlassHandle 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 }

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

    61     } else {

    62       return true;

    63     }

    64   }

    65   _index = length();

    66   next();

    67   return eos();

    68 }

    71 GrowableArray<FilteredField*> *FilteredFieldsMap::_filtered_fields =

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

    75 void FilteredFieldsMap::initialize() {

    76   int offset;

    77   offset = java_lang_Throwable::get_backtrace_offset();

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

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

    80   if (JDK_Version::is_gte_jdk16x_version()) {

    81     // The following class fields do not exist in

    82     // previous version of jdk.

    83     offset = sun_reflect_ConstantPool::oop_offset();

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

    85     offset = sun_reflect_UnsafeStaticFieldAccessorImpl::base_offset();

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

    87   }

    88 }

    90 int FilteredFieldStream::field_count() {

    91   int numflds = 0;

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

    93     numflds++;

    94   }

    95   return numflds;

    96 }

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