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); !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 Array<Klass*>* _interfaces; // transitive interfaces for initial class 50 int _interface_index; // current interface being processed 51 bool _local_only; // process initial class/interface only 52 bool _classes_only; // process classes only (no interfaces) 53 int _index; 54 55 virtual int length() const = 0; 56 57 public: 58 // constructor 59 KlassStream(instanceKlassHandle klass, bool local_only, bool classes_only); 60 61 // testing 62 bool eos(); 63 64 // iterating 65 virtual void next() = 0; 66 67 // accessors 68 instanceKlassHandle klass() const { return _klass; } 69 int index() const { return _index; } 70 }; 71 72 73 // A MethodStream streams over all methods in a class, superclasses and (super)interfaces. 74 // Streaming is done in reverse order (subclasses first, methods in reverse order) 75 // Usage: 76 // 77 // for (MethodStream st(k, false, false); !st.eos(); st.next()) { 78 // Method* m = st.method(); 79 // ... 80 // } 81 82 class MethodStream : public KlassStream { 83 private: 84 int length() const { return methods()->length(); } 85 Array<Method*>* methods() const { return _klass->methods(); } 86 public: 87 MethodStream(instanceKlassHandle klass, bool local_only, bool classes_only) 88 : KlassStream(klass, local_only, classes_only) { 89 _index = length(); 90 next(); 91 } 92 93 void next() { _index--; } 94 Method* method() const { return methods()->at(index()); } 95 }; 96 97 98 // A FieldStream streams over all fields in a class, superclasses and (super)interfaces. 99 // Streaming is done in reverse order (subclasses first, fields in reverse order) 100 // Usage: 101 // 102 // for (FieldStream st(k, false, false); !st.eos(); st.next()) { 103 // Symbol* field_name = st.name(); 104 // ... 105 // } 106 107 108 class FieldStream : public KlassStream { 109 private: 110 int length() const { return _klass->java_fields_count(); } 111 112 public: 113 FieldStream(instanceKlassHandle klass, bool local_only, bool classes_only) 114 : KlassStream(klass, local_only, classes_only) { 115 _index = length(); 116 next(); 117 } 118 119 void next() { _index -= 1; } 120 121 // Accessors for current field 122 AccessFlags access_flags() const { 123 AccessFlags flags; 124 flags.set_flags(_klass->field_access_flags(_index)); 125 return flags; 126 } 127 Symbol* name() const { 128 return _klass->field_name(_index); 129 } 130 Symbol* signature() const { 131 return _klass->field_signature(_index); 132 } 133 // missing: initval() 134 int offset() const { 135 return _klass->field_offset( index() ); 136 } 137 }; 138 139 class FilteredField : public CHeapObj<mtInternal> { 140 private: 141 Klass* _klass; 142 int _field_offset; 143 144 public: 145 FilteredField(Klass* klass, int field_offset) { 146 _klass = klass; 147 _field_offset = field_offset; 148 } 149 Klass* klass() { return _klass; } 150 int field_offset() { return _field_offset; } 151 }; 152 153 class FilteredFieldsMap : AllStatic { 154 private: 155 static GrowableArray<FilteredField *> *_filtered_fields; 156 public: 157 static void initialize(); 158 static bool is_filtered_field(Klass* klass, int field_offset) { 159 for (int i=0; i < _filtered_fields->length(); i++) { 160 if (klass == _filtered_fields->at(i)->klass() && 161 field_offset == _filtered_fields->at(i)->field_offset()) { 162 return true; 163 } 164 } 165 return false; 166 } 167 static int filtered_fields_count(Klass* klass, bool local_only) { 168 int nflds = 0; 169 for (int i=0; i < _filtered_fields->length(); i++) { 170 if (local_only && klass == _filtered_fields->at(i)->klass()) { 171 nflds++; 172 } else if (klass->is_subtype_of(_filtered_fields->at(i)->klass())) { 173 nflds++; 174 } 175 } 176 return nflds; 177 } 178 // Enhance Class Redefinition Support 179 static void classes_do(KlassClosure* f) { 180 for (int i = 0; i < _filtered_fields->length(); i++) { 181 f->do_klass(_filtered_fields->at(i)->klass()); 182 } 183 } 184 }; 185 186 187 // A FilteredFieldStream streams over all fields in a class, superclasses and 188 // (super)interfaces. Streaming is done in reverse order (subclasses first, 189 // fields in reverse order) 190 // 191 // Usage: 192 // 193 // for (FilteredFieldStream st(k, false, false); !st.eos(); st.next()) { 194 // Symbol* field_name = st.name(); 195 // ... 196 // } 197 198 class FilteredFieldStream : public FieldStream { 199 private: 200 int _filtered_fields_count; 201 bool has_filtered_field() { return (_filtered_fields_count > 0); } 202 203 public: 204 FilteredFieldStream(instanceKlassHandle klass, bool local_only, bool classes_only) 205 : FieldStream(klass, local_only, classes_only) { 206 _filtered_fields_count = FilteredFieldsMap::filtered_fields_count((Klass*)klass(), local_only); 207 } 208 int field_count(); 209 void next() { 210 _index -= 1; 211 if (has_filtered_field()) { 212 while (_index >=0 && FilteredFieldsMap::is_filtered_field((Klass*)_klass(), offset())) { 213 _index -= 1; 214 } 215 } 216 } 217 }; 218 219 #endif // SHARE_VM_RUNTIME_REFLECTIONUTILS_HPP