1 /* 2 * Copyright (c) 1999, 2018, 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_CI_CIINSTANCEKLASS_HPP 26 #define SHARE_VM_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 int _has_injected_fields; // any non static injected fields? lazily initialized. 71 72 // The possible values of the _implementor fall into following three cases: 73 // NULL: no implementor. 74 // A ciInstanceKlass that's not itself: one implementor. 75 // Itsef: more than one implementors. 76 ciInstanceKlass* _implementor; 77 78 void compute_injected_fields(); 79 bool compute_injected_fields_helper(); 80 81 protected: 82 ciInstanceKlass(Klass* k); 83 ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain); 84 85 InstanceKlass* get_instanceKlass() const { 86 return InstanceKlass::cast(get_Klass()); 87 } 88 89 oop loader(); 90 jobject loader_handle(); 91 92 oop protection_domain(); 93 jobject protection_domain_handle(); 94 95 const char* type_string() { return "ciInstanceKlass"; } 96 97 bool is_in_package_impl(const char* packagename, int len); 98 99 void print_impl(outputStream* st); 100 101 ciConstantPoolCache* field_cache(); 102 103 bool is_shared() { return _is_shared; } 104 105 void compute_shared_init_state(); 106 bool compute_shared_has_subklass(); 107 int compute_nonstatic_fields(); 108 GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields); 109 110 // Update the init_state for shared klasses 111 void update_if_shared(InstanceKlass::ClassState expected) { 112 if (_is_shared && _init_state != expected) { 113 if (is_loaded()) compute_shared_init_state(); 114 } 115 } 116 117 public: 118 // Has this klass been initialized? 119 bool is_initialized() { 120 update_if_shared(InstanceKlass::fully_initialized); 121 return _init_state == InstanceKlass::fully_initialized; 122 } 123 // Is this klass being initialized? 124 bool is_being_initialized() { 125 update_if_shared(InstanceKlass::being_initialized); 126 return _init_state == InstanceKlass::being_initialized; 127 } 128 // Has this klass been linked? 129 bool is_linked() { 130 update_if_shared(InstanceKlass::linked); 131 return _init_state >= InstanceKlass::linked; 132 } 133 134 // General klass information. 135 ciFlags flags() { 136 assert(is_loaded(), "must be loaded"); 137 return _flags; 138 } 139 bool has_finalizer() { 140 assert(is_loaded(), "must be loaded"); 141 return _has_finalizer; } 142 bool has_subklass() { 143 assert(is_loaded(), "must be loaded"); 144 if (_has_subklass == subklass_unknown || 145 (_is_shared && _has_subklass == subklass_false)) { 146 if (flags().is_final()) { 147 return false; 148 } else { 149 return compute_shared_has_subklass(); 150 } 151 } 152 return _has_subklass == subklass_true; 153 } 154 jint size_helper() { 155 return (Klass::layout_helper_size_in_bytes(layout_helper()) 156 >> LogHeapWordSize); 157 } 158 jint nonstatic_field_size() { 159 assert(is_loaded(), "must be loaded"); 160 return _nonstatic_field_size; } 161 jint has_nonstatic_fields() { 162 assert(is_loaded(), "must be loaded"); 163 return _has_nonstatic_fields; } 164 jint nonstatic_oop_map_size() { 165 assert(is_loaded(), "must be loaded"); 166 return _nonstatic_oop_map_size; } 167 ciInstanceKlass* super(); 168 jint nof_implementors() { 169 ciInstanceKlass* impl; 170 assert(is_loaded(), "must be loaded"); 171 impl = implementor(); 172 if (impl == NULL) { 173 return 0; 174 } else if (impl != this) { 175 return 1; 176 } else { 177 return 2; 178 } 179 } 180 bool has_nonstatic_concrete_methods() { 181 assert(is_loaded(), "must be loaded"); 182 return _has_nonstatic_concrete_methods; 183 } 184 185 bool is_unsafe_anonymous() { 186 return _is_unsafe_anonymous; 187 } 188 189 ciInstanceKlass* get_canonical_holder(int offset); 190 ciField* get_field_by_offset(int field_offset, bool is_static); 191 ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static); 192 193 // total number of nonstatic fields (including inherited): 194 int nof_nonstatic_fields() { 195 if (_nonstatic_fields == NULL) 196 return compute_nonstatic_fields(); 197 else 198 return _nonstatic_fields->length(); 199 } 200 201 bool has_injected_fields() { 202 if (_has_injected_fields == -1) { 203 compute_injected_fields(); 204 } 205 return _has_injected_fields > 0 ? true : false; 206 } 207 208 bool has_object_fields() const; 209 210 // nth nonstatic field (presented by ascending address) 211 ciField* nonstatic_field_at(int i) { 212 assert(_nonstatic_fields != NULL, ""); 213 return _nonstatic_fields->at(i); 214 } 215 216 ciInstanceKlass* unique_concrete_subklass(); 217 bool has_finalizable_subclass(); 218 219 bool contains_field_offset(int offset) { 220 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 221 } 222 223 // Get the instance of java.lang.Class corresponding to 224 // this klass. This instance is used for locking of 225 // synchronized static methods of this klass. 226 ciInstance* java_mirror(); 227 228 // Java access flags 229 bool is_public () { return flags().is_public(); } 230 bool is_final () { return flags().is_final(); } 231 bool is_super () { return flags().is_super(); } 232 bool is_interface () { return flags().is_interface(); } 233 bool is_abstract () { return flags().is_abstract(); } 234 235 ciMethod* find_method(ciSymbol* name, ciSymbol* signature); 236 // Note: To find a method from name and type strings, use ciSymbol::make, 237 // but consider adding to vmSymbols.hpp instead. 238 239 bool is_leaf_type(); 240 ciInstanceKlass* implementor(); 241 242 // Is the defining class loader of this class the default loader? 243 bool uses_default_loader() const; 244 245 bool is_java_lang_Object() const; 246 247 BasicType box_klass_type() const; 248 bool is_box_klass() const; 249 bool is_boxed_value_offset(int offset) const; 250 251 // Is this klass in the given package? 252 bool is_in_package(const char* packagename) { 253 return is_in_package(packagename, (int) strlen(packagename)); 254 } 255 bool is_in_package(const char* packagename, int len); 256 257 // What kind of ciObject is this? 258 bool is_instance_klass() const { return true; } 259 bool is_java_klass() const { return true; } 260 261 virtual ciKlass* exact_klass() { 262 if (is_loaded() && is_final() && !is_interface()) { 263 return this; 264 } 265 return NULL; 266 } 267 268 ciInstanceKlass* unsafe_anonymous_host(); 269 270 bool can_be_instantiated() { 271 assert(is_loaded(), "must be loaded"); 272 return !is_interface() && !is_abstract(); 273 } 274 275 // Dump the current state of this klass for compilation replay. 276 virtual void dump_replay_data(outputStream* out); 277 278 #ifdef ASSERT 279 bool debug_final_field_at(int offset); 280 bool debug_stable_field_at(int offset); 281 #endif 282 }; 283 284 #endif // SHARE_VM_CI_CIINSTANCEKLASS_HPP