1 /* 2 * Copyright (c) 1999, 2020, 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_CI_CIINSTANCEKLASS_HPP 26 #define SHARE_CI_CIINSTANCEKLASS_HPP 27 28 #include "ci/ciConstantPoolCache.hpp" 29 #include "ci/ciFlags.hpp" 30 #include "ci/ciKlass.hpp" 31 #include "ci/ciSymbol.hpp" 32 33 // ciInstanceKlass 34 // 35 // This class represents a Klass* in the HotSpot virtual machine 36 // whose Klass part is an InstanceKlass. It may or may not 37 // be loaded. 38 class ciInstanceKlass : public ciKlass { 39 CI_PACKAGE_ACCESS 40 friend class ciBytecodeStream; 41 friend class ciEnv; 42 friend class ciExceptionHandler; 43 friend class ciMethod; 44 friend class ciField; 45 46 private: 47 enum SubklassValue { subklass_unknown, subklass_false, subklass_true }; 48 49 jobject _loader; 50 jobject _protection_domain; 51 52 InstanceKlass::ClassState _init_state; // state of class 53 bool _is_shared; 54 bool _has_finalizer; 55 SubklassValue _has_subklass; 56 bool _has_nonstatic_fields; 57 bool _has_nonstatic_concrete_methods; 58 bool _is_unsafe_anonymous; 59 bool _is_hidden; 60 61 ciFlags _flags; 62 jint _nonstatic_field_size; 63 jint _nonstatic_oop_map_size; 64 65 // Lazy fields get filled in only upon request. 66 ciInstanceKlass* _super; 67 ciInstance* _java_mirror; 68 69 ciConstantPoolCache* _field_cache; // cached map index->field 70 GrowableArray<ciField*>* _nonstatic_fields; 71 int _has_injected_fields; // any non static injected fields? lazily initialized. 72 73 // The possible values of the _implementor fall into following three cases: 74 // NULL: no implementor. 75 // A ciInstanceKlass that's not itself: one implementor. 76 // Itself: more than one implementor. 77 ciInstanceKlass* _implementor; 78 79 void compute_injected_fields(); 80 bool compute_injected_fields_helper(); 81 82 protected: 83 ciInstanceKlass(Klass* k); 84 ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain); 85 86 InstanceKlass* get_instanceKlass() const { 87 return InstanceKlass::cast(get_Klass()); 88 } 89 90 oop loader(); 91 jobject loader_handle(); 92 93 oop protection_domain(); 94 jobject protection_domain_handle(); 95 96 const char* type_string() { return "ciInstanceKlass"; } 97 98 bool is_in_package_impl(const char* packagename, int len); 99 100 void print_impl(outputStream* st); 101 102 ciConstantPoolCache* field_cache(); 103 104 bool is_shared() { return _is_shared; } 105 106 void compute_shared_init_state(); 107 bool compute_shared_has_subklass(); 108 int compute_nonstatic_fields(); 109 GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields); 110 111 // Update the init_state for shared klasses 112 void update_if_shared(InstanceKlass::ClassState expected) { 113 if (_is_shared && _init_state != expected) { 114 if (is_loaded()) compute_shared_init_state(); 115 } 116 } 117 118 public: 119 // Has this klass been initialized? 120 bool is_initialized() { 121 update_if_shared(InstanceKlass::fully_initialized); 122 return _init_state == InstanceKlass::fully_initialized; 123 } 124 bool is_not_initialized() { 125 update_if_shared(InstanceKlass::fully_initialized); 126 return _init_state < InstanceKlass::being_initialized; 127 } 128 // Is this klass being initialized? 129 bool is_being_initialized() { 130 update_if_shared(InstanceKlass::being_initialized); 131 return _init_state == InstanceKlass::being_initialized; 132 } 133 // Has this klass been linked? 134 bool is_linked() { 135 update_if_shared(InstanceKlass::linked); 136 return _init_state >= InstanceKlass::linked; 137 } 138 // Is this klass in error state? 139 bool is_in_error_state() { 140 update_if_shared(InstanceKlass::initialization_error); 141 return _init_state == InstanceKlass::initialization_error; 142 } 143 144 // General klass information. 145 ciFlags flags() { 146 assert(is_loaded(), "must be loaded"); 147 return _flags; 148 } 149 bool has_finalizer() { 150 assert(is_loaded(), "must be loaded"); 151 return _has_finalizer; } 152 bool has_subklass() { 153 assert(is_loaded(), "must be loaded"); 154 if (_has_subklass == subklass_unknown || 155 (_is_shared && _has_subklass == subklass_false)) { 156 if (flags().is_final()) { 157 return false; 158 } else { 159 return compute_shared_has_subklass(); 160 } 161 } 162 return _has_subklass == subklass_true; 163 } 164 jint size_helper() { 165 return (Klass::layout_helper_size_in_bytes(layout_helper()) 166 >> LogHeapWordSize); 167 } 168 jint nonstatic_field_size() { 169 assert(is_loaded(), "must be loaded"); 170 return _nonstatic_field_size; } 171 jint has_nonstatic_fields() { 172 assert(is_loaded(), "must be loaded"); 173 return _has_nonstatic_fields; } 174 jint nonstatic_oop_map_size() { 175 assert(is_loaded(), "must be loaded"); 176 return _nonstatic_oop_map_size; } 177 ciInstanceKlass* super(); 178 jint nof_implementors() { 179 ciInstanceKlass* impl; 180 assert(is_loaded(), "must be loaded"); 181 impl = implementor(); 182 if (impl == NULL) { 183 return 0; 184 } else if (impl != this) { 185 return 1; 186 } else { 187 return 2; 188 } 189 } 190 bool has_nonstatic_concrete_methods() { 191 assert(is_loaded(), "must be loaded"); 192 return _has_nonstatic_concrete_methods; 193 } 194 195 bool is_unsafe_anonymous() const { 196 return _is_unsafe_anonymous; 197 } 198 199 bool is_hidden() const { 200 return _is_hidden; 201 } 202 203 ciInstanceKlass* get_canonical_holder(int offset); 204 ciField* get_field_by_offset(int field_offset, bool is_static); 205 ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static); 206 207 // total number of nonstatic fields (including inherited): 208 int nof_nonstatic_fields() { 209 if (_nonstatic_fields == NULL) 210 return compute_nonstatic_fields(); 211 else 212 return _nonstatic_fields->length(); 213 } 214 215 bool has_injected_fields() { 216 if (_has_injected_fields == -1) { 217 compute_injected_fields(); 218 } 219 return _has_injected_fields > 0 ? true : false; 220 } 221 222 bool has_object_fields() const; 223 224 // nth nonstatic field (presented by ascending address) 225 ciField* nonstatic_field_at(int i) { 226 assert(_nonstatic_fields != NULL, ""); 227 return _nonstatic_fields->at(i); 228 } 229 230 ciInstanceKlass* unique_concrete_subklass(); 231 bool has_finalizable_subclass(); 232 233 bool contains_field_offset(int offset); 234 235 // Get the instance of java.lang.Class corresponding to 236 // this klass. This instance is used for locking of 237 // synchronized static methods of this klass. 238 ciInstance* java_mirror(); 239 240 // Java access flags 241 bool is_public () { return flags().is_public(); } 242 bool is_final () { return flags().is_final(); } 243 bool is_super () { return flags().is_super(); } 244 bool is_interface () { return flags().is_interface(); } 245 bool is_abstract () { return flags().is_abstract(); } 246 247 ciMethod* find_method(ciSymbol* name, ciSymbol* signature); 248 // Note: To find a method from name and type strings, use ciSymbol::make, 249 // but consider adding to vmSymbols.hpp instead. 250 251 bool is_leaf_type(); 252 ciInstanceKlass* implementor(); 253 254 ciInstanceKlass* unique_implementor() { 255 assert(is_loaded(), "must be loaded"); 256 ciInstanceKlass* impl = implementor(); 257 return (impl != this ? impl : NULL); 258 } 259 260 // Is the defining class loader of this class the default loader? 261 bool uses_default_loader() const; 262 263 bool is_java_lang_Object() const; 264 265 BasicType box_klass_type() const; 266 bool is_box_klass() const; 267 bool is_boxed_value_offset(int offset) const; 268 269 // Is this klass in the given package? 270 bool is_in_package(const char* packagename) { 271 return is_in_package(packagename, (int) strlen(packagename)); 272 } 273 bool is_in_package(const char* packagename, int len); 274 275 // What kind of ciObject is this? 276 bool is_instance_klass() const { return true; } 277 bool is_java_klass() const { return true; } 278 279 virtual ciKlass* exact_klass() { 280 if (is_loaded() && is_final() && !is_interface()) { 281 return this; 282 } 283 return NULL; 284 } 285 286 ciInstanceKlass* unsafe_anonymous_host(); 287 288 bool can_be_instantiated() { 289 assert(is_loaded(), "must be loaded"); 290 return !is_interface() && !is_abstract(); 291 } 292 293 // Dump the current state of this klass for compilation replay. 294 virtual void dump_replay_data(outputStream* out); 295 296 #ifdef ASSERT 297 bool debug_final_field_at(int offset); 298 bool debug_stable_field_at(int offset); 299 #endif 300 }; 301 302 #endif // SHARE_CI_CIINSTANCEKLASS_HPP