1 /* 2 * Copyright (c) 1999, 2019, 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 60 ciFlags _flags; 61 jint _nonstatic_field_size; 62 jint _nonstatic_oop_map_size; 63 64 // Lazy fields get filled in only upon request. 65 ciInstanceKlass* _super; 66 ciInstance* _java_mirror; 67 68 ciConstantPoolCache* _field_cache; // cached map index->field 69 GrowableArray<ciField*>* _nonstatic_fields; 70 71 int _has_injected_fields; // any non static injected fields? lazily initialized. 72 73 ciInstanceKlass* _vcc_klass; // points to the value-capable class corresponding to the current derived value type class. 74 75 // The possible values of the _implementor fall into following three cases: 76 // NULL: no implementor. 77 // A ciInstanceKlass that's not itself: one implementor. 78 // Itsef: more than one implementors. 79 ciInstanceKlass* _implementor; 80 81 void compute_injected_fields(); 82 bool compute_injected_fields_helper(); 83 84 protected: 85 ciInstanceKlass(Klass* k); 86 ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain, BasicType bt = T_OBJECT); // for unloaded klasses 87 88 InstanceKlass* get_instanceKlass() const { 89 return InstanceKlass::cast(get_Klass()); 90 } 91 92 oop loader(); 93 jobject loader_handle(); 94 95 oop protection_domain(); 96 jobject protection_domain_handle(); 97 98 const char* type_string() { return "ciInstanceKlass"; } 99 100 bool is_in_package_impl(const char* packagename, int len); 101 102 void print_impl(outputStream* st); 103 104 ciConstantPoolCache* field_cache(); 105 106 bool is_shared() { return _is_shared; } 107 108 void compute_shared_init_state(); 109 bool compute_shared_has_subklass(); 110 virtual int compute_nonstatic_fields(); 111 GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields, bool flatten = true); 112 113 // Update the init_state for shared klasses 114 void update_if_shared(InstanceKlass::ClassState expected) { 115 if (_is_shared && _init_state != expected) { 116 if (is_loaded()) compute_shared_init_state(); 117 } 118 } 119 120 public: 121 // Has this klass been initialized? 122 bool is_initialized() { 123 update_if_shared(InstanceKlass::fully_initialized); 124 return _init_state == InstanceKlass::fully_initialized; 125 } 126 // Is this klass being initialized? 127 bool is_being_initialized() { 128 update_if_shared(InstanceKlass::being_initialized); 129 return _init_state == InstanceKlass::being_initialized; 130 } 131 // Has this klass been linked? 132 bool is_linked() { 133 update_if_shared(InstanceKlass::linked); 134 return _init_state >= InstanceKlass::linked; 135 } 136 137 // General klass information. 138 ciFlags flags() { 139 assert(is_loaded(), "must be loaded"); 140 return _flags; 141 } 142 bool has_finalizer() { 143 assert(is_loaded(), "must be loaded"); 144 return _has_finalizer; } 145 bool has_subklass() { 146 assert(is_loaded(), "must be loaded"); 147 if (_has_subklass == subklass_unknown || 148 (_is_shared && _has_subklass == subklass_false)) { 149 if (flags().is_final()) { 150 return false; 151 } else { 152 return compute_shared_has_subklass(); 153 } 154 } 155 return _has_subklass == subklass_true; 156 } 157 jint size_helper() { 158 return (Klass::layout_helper_size_in_bytes(layout_helper()) 159 >> LogHeapWordSize); 160 } 161 jint nonstatic_field_size() { 162 assert(is_loaded(), "must be loaded"); 163 return _nonstatic_field_size; } 164 jint has_nonstatic_fields() { 165 assert(is_loaded(), "must be loaded"); 166 return _has_nonstatic_fields; } 167 jint nonstatic_oop_map_size() { 168 assert(is_loaded(), "must be loaded"); 169 return _nonstatic_oop_map_size; } 170 ciInstanceKlass* super(); 171 jint nof_implementors() { 172 ciInstanceKlass* impl; 173 assert(is_loaded(), "must be loaded"); 174 impl = implementor(); 175 if (impl == NULL) { 176 return 0; 177 } else if (impl != this) { 178 return 1; 179 } else { 180 return 2; 181 } 182 } 183 bool has_nonstatic_concrete_methods() { 184 assert(is_loaded(), "must be loaded"); 185 return _has_nonstatic_concrete_methods; 186 } 187 188 bool is_unsafe_anonymous() { 189 return _is_unsafe_anonymous; 190 } 191 192 ciInstanceKlass* get_canonical_holder(int offset); 193 ciField* get_field_by_offset(int field_offset, bool is_static); 194 ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static); 195 // get field descriptor at field_offset ignoring flattening 196 ciField* get_non_flattened_field_by_offset(int field_offset); 197 198 // total number of nonstatic fields (including inherited): 199 int nof_nonstatic_fields() { 200 if (_nonstatic_fields == NULL) { 201 return compute_nonstatic_fields(); 202 } else { 203 return _nonstatic_fields->length(); 204 } 205 } 206 207 bool has_injected_fields() { 208 if (_has_injected_fields == -1) { 209 compute_injected_fields(); 210 } 211 return _has_injected_fields > 0 ? true : false; 212 } 213 214 bool has_object_fields() const; 215 216 // nth nonstatic field (presented by ascending address) 217 ciField* nonstatic_field_at(int i) { 218 assert(_nonstatic_fields != NULL, ""); 219 return _nonstatic_fields->at(i); 220 } 221 222 ciInstanceKlass* unique_concrete_subklass(); 223 bool has_finalizable_subclass(); 224 225 bool contains_field_offset(int offset) { 226 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size(), is_valuetype()); 227 } 228 229 // Get the instance of java.lang.Class corresponding to 230 // this klass. This instance is used for locking of 231 // synchronized static methods of this klass. 232 ciInstance* java_mirror(); 233 234 // Java access flags 235 bool is_public () { return flags().is_public(); } 236 bool is_final () { return flags().is_final(); } 237 bool is_super () { return flags().is_super(); } 238 bool is_interface () { return flags().is_interface(); } 239 bool is_abstract () { return flags().is_abstract(); } 240 241 ciMethod* find_method(ciSymbol* name, ciSymbol* signature); 242 // Note: To find a method from name and type strings, use ciSymbol::make, 243 // but consider adding to vmSymbols.hpp instead. 244 245 bool is_leaf_type(); 246 ciInstanceKlass* implementor(); 247 ciInstanceKlass* vcc_klass(); 248 249 // Is the defining class loader of this class the default loader? 250 bool uses_default_loader() const; 251 252 bool is_java_lang_Object() const; 253 254 BasicType box_klass_type() const; 255 bool is_box_klass() const; 256 bool is_boxed_value_offset(int offset) const; 257 258 // Is this klass in the given package? 259 bool is_in_package(const char* packagename) { 260 return is_in_package(packagename, (int) strlen(packagename)); 261 } 262 bool is_in_package(const char* packagename, int len); 263 264 // What kind of ciObject is this? 265 bool is_instance_klass() const { return true; } 266 bool is_java_klass() const { return true; } 267 268 virtual ciKlass* exact_klass() { 269 if (is_loaded() && is_final() && !is_interface()) { 270 return this; 271 } 272 return NULL; 273 } 274 275 ciInstanceKlass* unsafe_anonymous_host(); 276 277 bool can_be_instantiated() { 278 assert(is_loaded(), "must be loaded"); 279 return !is_interface() && !is_abstract(); 280 } 281 282 // Dump the current state of this klass for compilation replay. 283 virtual void dump_replay_data(outputStream* out); 284 285 #ifdef ASSERT 286 bool debug_final_field_at(int offset); 287 bool debug_stable_field_at(int offset); 288 #endif 289 }; 290 291 #endif // SHARE_CI_CIINSTANCEKLASS_HPP