1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/runtime/reflectionUtils.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,240 @@
1.4 +/*
1.5 + * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_RUNTIME_REFLECTIONUTILS_HPP
1.29 +#define SHARE_VM_RUNTIME_REFLECTIONUTILS_HPP
1.30 +
1.31 +#include "memory/allocation.hpp"
1.32 +#include "oops/instanceKlass.hpp"
1.33 +#include "oops/objArrayOop.hpp"
1.34 +#include "oops/oopsHierarchy.hpp"
1.35 +#include "runtime/handles.inline.hpp"
1.36 +#include "runtime/reflection.hpp"
1.37 +#include "utilities/accessFlags.hpp"
1.38 +#include "utilities/globalDefinitions.hpp"
1.39 +
1.40 +// A KlassStream is an abstract stream for streaming over self, superclasses
1.41 +// and (super)interfaces. Streaming is done in reverse order (subclasses first,
1.42 +// interfaces last).
1.43 +//
1.44 +// for (KlassStream st(k, false, false, false); !st.eos(); st.next()) {
1.45 +// Klass* k = st.klass();
1.46 +// ...
1.47 +// }
1.48 +
1.49 +class KlassStream VALUE_OBJ_CLASS_SPEC {
1.50 + protected:
1.51 + instanceKlassHandle _klass; // current klass/interface iterated over
1.52 + instanceKlassHandle _base_klass; // initial klass/interface to iterate over
1.53 + Array<Klass*>* _interfaces; // transitive interfaces for initial class
1.54 + int _interface_index; // current interface being processed
1.55 + bool _local_only; // process initial class/interface only
1.56 + bool _classes_only; // process classes only (no interfaces)
1.57 + bool _walk_defaults; // process default methods
1.58 + bool _base_class_search_defaults; // time to process default methods
1.59 + bool _defaults_checked; // already checked for default methods
1.60 + int _index;
1.61 +
1.62 + virtual int length() = 0;
1.63 +
1.64 + public:
1.65 + // constructor
1.66 + KlassStream(instanceKlassHandle klass, bool local_only, bool classes_only, bool walk_defaults);
1.67 +
1.68 + // testing
1.69 + bool eos();
1.70 +
1.71 + // iterating
1.72 + virtual void next() = 0;
1.73 +
1.74 + // accessors
1.75 + instanceKlassHandle klass() const { return _klass; }
1.76 + int index() const { return _index; }
1.77 + bool base_class_search_defaults() const { return _base_class_search_defaults; }
1.78 + void base_class_search_defaults(bool b) { _base_class_search_defaults = b; }
1.79 +};
1.80 +
1.81 +
1.82 +// A MethodStream streams over all methods in a class, superclasses and (super)interfaces.
1.83 +// Streaming is done in reverse order (subclasses first, methods in reverse order)
1.84 +// Usage:
1.85 +//
1.86 +// for (MethodStream st(k, false, false); !st.eos(); st.next()) {
1.87 +// Method* m = st.method();
1.88 +// ...
1.89 +// }
1.90 +
1.91 +class MethodStream : public KlassStream {
1.92 + private:
1.93 + int length() { return methods()->length(); }
1.94 + Array<Method*>* methods() {
1.95 + if (base_class_search_defaults()) {
1.96 + base_class_search_defaults(false);
1.97 + return _klass->default_methods();
1.98 + } else {
1.99 + return _klass->methods();
1.100 + }
1.101 + }
1.102 + public:
1.103 + MethodStream(instanceKlassHandle klass, bool local_only, bool classes_only)
1.104 + : KlassStream(klass, local_only, classes_only, true) {
1.105 + _index = length();
1.106 + next();
1.107 + }
1.108 +
1.109 + void next() { _index--; }
1.110 + Method* method() { return methods()->at(index()); }
1.111 +};
1.112 +
1.113 +
1.114 +// A FieldStream streams over all fields in a class, superclasses and (super)interfaces.
1.115 +// Streaming is done in reverse order (subclasses first, fields in reverse order)
1.116 +// Usage:
1.117 +//
1.118 +// for (FieldStream st(k, false, false); !st.eos(); st.next()) {
1.119 +// Symbol* field_name = st.name();
1.120 +// ...
1.121 +// }
1.122 +
1.123 +
1.124 +class FieldStream : public KlassStream {
1.125 + private:
1.126 + int length() { return _klass->java_fields_count(); }
1.127 +
1.128 + fieldDescriptor _fd_buf;
1.129 +
1.130 + public:
1.131 + FieldStream(instanceKlassHandle klass, bool local_only, bool classes_only)
1.132 + : KlassStream(klass, local_only, classes_only, false) {
1.133 + _index = length();
1.134 + next();
1.135 + }
1.136 +
1.137 + void next() { _index -= 1; }
1.138 +
1.139 + // Accessors for current field
1.140 + AccessFlags access_flags() const {
1.141 + AccessFlags flags;
1.142 + flags.set_flags(_klass->field_access_flags(_index));
1.143 + return flags;
1.144 + }
1.145 + Symbol* name() const {
1.146 + return _klass->field_name(_index);
1.147 + }
1.148 + Symbol* signature() const {
1.149 + return _klass->field_signature(_index);
1.150 + }
1.151 + // missing: initval()
1.152 + int offset() const {
1.153 + return _klass->field_offset( index() );
1.154 + }
1.155 + // bridge to a heavier API:
1.156 + fieldDescriptor& field_descriptor() const {
1.157 + fieldDescriptor& field = const_cast<fieldDescriptor&>(_fd_buf);
1.158 + field.reinitialize(_klass(), _index);
1.159 + return field;
1.160 + }
1.161 +};
1.162 +
1.163 +class FilteredField : public CHeapObj<mtInternal> {
1.164 + private:
1.165 + Klass* _klass;
1.166 + int _field_offset;
1.167 +
1.168 + public:
1.169 + FilteredField(Klass* klass, int field_offset) {
1.170 + _klass = klass;
1.171 + _field_offset = field_offset;
1.172 + }
1.173 + Klass* klass() { return _klass; }
1.174 + int field_offset() { return _field_offset; }
1.175 +};
1.176 +
1.177 +class FilteredFieldsMap : AllStatic {
1.178 + private:
1.179 + static GrowableArray<FilteredField *> *_filtered_fields;
1.180 + public:
1.181 + static void initialize();
1.182 + static bool is_filtered_field(Klass* klass, int field_offset) {
1.183 + for (int i=0; i < _filtered_fields->length(); i++) {
1.184 + if (klass == _filtered_fields->at(i)->klass() &&
1.185 + field_offset == _filtered_fields->at(i)->field_offset()) {
1.186 + return true;
1.187 + }
1.188 + }
1.189 + return false;
1.190 + }
1.191 + static int filtered_fields_count(Klass* klass, bool local_only) {
1.192 + int nflds = 0;
1.193 + for (int i=0; i < _filtered_fields->length(); i++) {
1.194 + if (local_only && klass == _filtered_fields->at(i)->klass()) {
1.195 + nflds++;
1.196 + } else if (klass->is_subtype_of(_filtered_fields->at(i)->klass())) {
1.197 + nflds++;
1.198 + }
1.199 + }
1.200 + return nflds;
1.201 + }
1.202 + // Enhance Class Redefinition Support
1.203 + static void classes_do(KlassClosure* f) {
1.204 + for (int i = 0; i < _filtered_fields->length(); i++) {
1.205 + f->do_klass(_filtered_fields->at(i)->klass());
1.206 + }
1.207 + }
1.208 +};
1.209 +
1.210 +
1.211 +// A FilteredFieldStream streams over all fields in a class, superclasses and
1.212 +// (super)interfaces. Streaming is done in reverse order (subclasses first,
1.213 +// fields in reverse order)
1.214 +//
1.215 +// Usage:
1.216 +//
1.217 +// for (FilteredFieldStream st(k, false, false); !st.eos(); st.next()) {
1.218 +// Symbol* field_name = st.name();
1.219 +// ...
1.220 +// }
1.221 +
1.222 +class FilteredFieldStream : public FieldStream {
1.223 + private:
1.224 + int _filtered_fields_count;
1.225 + bool has_filtered_field() { return (_filtered_fields_count > 0); }
1.226 +
1.227 + public:
1.228 + FilteredFieldStream(instanceKlassHandle klass, bool local_only, bool classes_only)
1.229 + : FieldStream(klass, local_only, classes_only) {
1.230 + _filtered_fields_count = FilteredFieldsMap::filtered_fields_count((Klass*)klass(), local_only);
1.231 + }
1.232 + int field_count();
1.233 + void next() {
1.234 + _index -= 1;
1.235 + if (has_filtered_field()) {
1.236 + while (_index >=0 && FilteredFieldsMap::is_filtered_field((Klass*)_klass(), offset())) {
1.237 + _index -= 1;
1.238 + }
1.239 + }
1.240 + }
1.241 +};
1.242 +
1.243 +#endif // SHARE_VM_RUNTIME_REFLECTIONUTILS_HPP
