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 */ 24 25 #ifndef SHARE_VM_RUNTIME_REFLECTIONUTILS_HPP 26 #define SHARE_VM_RUNTIME_REFLECTIONUTILS_HPP 27 28 #include "memory/allocation.hpp" 29 #include "oops/instanceKlass.hpp" 30 #include "oops/objArrayOop.hpp" 31 #include "oops/oopsHierarchy.hpp" 32 #include "runtime/handles.inline.hpp" 33 #include "runtime/reflection.hpp" 34 #include "utilities/accessFlags.hpp" 35 #include "utilities/globalDefinitions.hpp" 36 37 // A KlassStream is an abstract stream for streaming over self, superclasses 38 // and (super)interfaces. Streaming is done in reverse order (subclasses first, 39 // interfaces last). 40 // 41 // for (KlassStream st(k, false, false, false); !st.eos(); st.next()) { 42 // Klass* k = st.klass(); 43 // ... 44 // } 45 46 class KlassStream VALUE_OBJ_CLASS_SPEC { 47 protected: 48 instanceKlassHandle _klass; // current klass/interface iterated over 49 instanceKlassHandle _base_klass; // initial klass/interface to iterate over 50 Array<Klass*>* _interfaces; // transitive interfaces for initial class 51 int _interface_index; // current interface being processed 52 bool _local_only; // process initial class/interface only 53 bool _classes_only; // process classes only (no interfaces) 54 bool _walk_defaults; // process default methods 55 bool _base_class_search_defaults; // time to process default methods 56 bool _defaults_checked; // already checked for default methods 57 int _index; 58 59 virtual int length() = 0; 60 61 public: 62 // constructor 63 KlassStream(instanceKlassHandle klass, bool local_only, bool classes_only, bool walk_defaults); 64 65 // testing 66 bool eos(); 67 68 // iterating 69 virtual void next() = 0; 70 71 // accessors klass() const72 instanceKlassHandle klass() const { return _klass; } index() const73 int index() const { return _index; } base_class_search_defaults() const74 bool base_class_search_defaults() const { return _base_class_search_defaults; } base_class_search_defaults(bool b)75 void base_class_search_defaults(bool b) { _base_class_search_defaults = b; } 76 }; 77 78 79 // A MethodStream streams over all methods in a class, superclasses and (super)interfaces. 80 // Streaming is done in reverse order (subclasses first, methods in reverse order) 81 // Usage: 82 // 83 // for (MethodStream st(k, false, false); !st.eos(); st.next()) { 84 // Method* m = st.method(); 85 // ... 86 // } 87 88 class MethodStream : public KlassStream { 89 private: length()90 int length() { return methods()->length(); } methods()91 Array<Method*>* methods() { 92 if (base_class_search_defaults()) { 93 base_class_search_defaults(false); 94 return _klass->default_methods(); 95 } else { 96 return _klass->methods(); 97 } 98 } 99 public: MethodStream(instanceKlassHandle klass,bool local_only,bool classes_only)100 MethodStream(instanceKlassHandle klass, bool local_only, bool classes_only) 101 : KlassStream(klass, local_only, classes_only, true) { 102 _index = length(); 103 next(); 104 } 105 next()106 void next() { _index--; } method()107 Method* method() { return methods()->at(index()); } 108 }; 109 110 111 // A FieldStream streams over all fields in a class, superclasses and (super)interfaces. 112 // Streaming is done in reverse order (subclasses first, fields in reverse order) 113 // Usage: 114 // 115 // for (FieldStream st(k, false, false); !st.eos(); st.next()) { 116 // Symbol* field_name = st.name(); 117 // ... 118 // } 119 120 121 class FieldStream : public KlassStream { 122 private: length()123 int length() { return _klass->java_fields_count(); } 124 125 fieldDescriptor _fd_buf; 126 127 public: FieldStream(instanceKlassHandle klass,bool local_only,bool classes_only)128 FieldStream(instanceKlassHandle klass, bool local_only, bool classes_only) 129 : KlassStream(klass, local_only, classes_only, false) { 130 _index = length(); 131 next(); 132 } 133 next()134 void next() { _index -= 1; } 135 136 // Accessors for current field access_flags() const137 AccessFlags access_flags() const { 138 AccessFlags flags; 139 flags.set_flags(_klass->field_access_flags(_index)); 140 return flags; 141 } name() const142 Symbol* name() const { 143 return _klass->field_name(_index); 144 } signature() const145 Symbol* signature() const { 146 return _klass->field_signature(_index); 147 } 148 // missing: initval() offset() const149 int offset() const { 150 return _klass->field_offset( index() ); 151 } 152 // bridge to a heavier API: field_descriptor() const153 fieldDescriptor& field_descriptor() const { 154 fieldDescriptor& field = const_cast<fieldDescriptor&>(_fd_buf); 155 field.reinitialize(_klass(), _index); 156 return field; 157 } 158 }; 159 160 class FilteredField : public CHeapObj<mtInternal> { 161 private: 162 Klass* _klass; 163 int _field_offset; 164 165 public: FilteredField(Klass * klass,int field_offset)166 FilteredField(Klass* klass, int field_offset) { 167 _klass = klass; 168 _field_offset = field_offset; 169 } klass()170 Klass* klass() { return _klass; } field_offset()171 int field_offset() { return _field_offset; } 172 }; 173 174 class FilteredFieldsMap : AllStatic { 175 private: 176 static GrowableArray<FilteredField *> *_filtered_fields; 177 public: 178 static void initialize(); is_filtered_field(Klass * klass,int field_offset)179 static bool is_filtered_field(Klass* klass, int field_offset) { 180 for (int i=0; i < _filtered_fields->length(); i++) { 181 if (klass == _filtered_fields->at(i)->klass() && 182 field_offset == _filtered_fields->at(i)->field_offset()) { 183 return true; 184 } 185 } 186 return false; 187 } filtered_fields_count(Klass * klass,bool local_only)188 static int filtered_fields_count(Klass* klass, bool local_only) { 189 int nflds = 0; 190 for (int i=0; i < _filtered_fields->length(); i++) { 191 if (local_only && klass == _filtered_fields->at(i)->klass()) { 192 nflds++; 193 } else if (klass->is_subtype_of(_filtered_fields->at(i)->klass())) { 194 nflds++; 195 } 196 } 197 return nflds; 198 } 199 // Enhance Class Redefinition Support classes_do(KlassClosure * f)200 static void classes_do(KlassClosure* f) { 201 for (int i = 0; i < _filtered_fields->length(); i++) { 202 f->do_klass(_filtered_fields->at(i)->klass()); 203 } 204 } 205 }; 206 207 208 // A FilteredFieldStream streams over all fields in a class, superclasses and 209 // (super)interfaces. Streaming is done in reverse order (subclasses first, 210 // fields in reverse order) 211 // 212 // Usage: 213 // 214 // for (FilteredFieldStream st(k, false, false); !st.eos(); st.next()) { 215 // Symbol* field_name = st.name(); 216 // ... 217 // } 218 219 class FilteredFieldStream : public FieldStream { 220 private: 221 int _filtered_fields_count; has_filtered_field()222 bool has_filtered_field() { return (_filtered_fields_count > 0); } 223 224 public: FilteredFieldStream(instanceKlassHandle klass,bool local_only,bool classes_only)225 FilteredFieldStream(instanceKlassHandle klass, bool local_only, bool classes_only) 226 : FieldStream(klass, local_only, classes_only) { 227 _filtered_fields_count = FilteredFieldsMap::filtered_fields_count((Klass*)klass(), local_only); 228 } 229 int field_count(); next()230 void next() { 231 _index -= 1; 232 if (has_filtered_field()) { 233 while (_index >=0 && FilteredFieldsMap::is_filtered_field((Klass*)_klass(), offset())) { 234 _index -= 1; 235 } 236 } 237 } 238 }; 239 240 #endif // SHARE_VM_RUNTIME_REFLECTIONUTILS_HPP 241