1 /* 2 * Copyright (c) 1999, 2017, 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 jobject _loader; 48 jobject _protection_domain; 49 50 InstanceKlass::ClassState _init_state; // state of class 51 bool _is_shared; 52 bool _has_finalizer; 53 bool _has_subklass; 54 bool _has_nonstatic_fields; 55 bool _has_nonstatic_concrete_methods; 56 bool _is_anonymous; 57 58 ciFlags _flags; 59 jint _nonstatic_field_size; 60 jint _nonstatic_oop_map_size; 61 62 // Lazy fields get filled in only upon request. 63 ciInstanceKlass* _super; 64 ciInstance* _java_mirror; 65 66 ciConstantPoolCache* _field_cache; // cached map index->field 67 GrowableArray<ciField*>* _nonstatic_fields; 68 int _has_injected_fields; // any non static injected fields? lazily initialized. 69 int _has_object_fields; // any object fields? lazily initialized. 70 71 // The possible values of the _implementor fall into following three cases: 72 // NULL: no implementor. 73 // A ciInstanceKlass that's not itself: one implementor. 74 // Itsef: more than one implementors. 75 ciInstanceKlass* _implementor; 76 77 void compute_injected_fields(); 78 bool compute_injected_fields_helper(); 79 void compute_object_fields(); 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 (_is_shared && !_has_subklass) { 145 if (flags().is_final()) { 146 return false; 147 } else { 148 return compute_shared_has_subklass(); 149 } 150 } 151 return _has_subklass; 152 } 153 jint size_helper() { 154 return (Klass::layout_helper_size_in_bytes(layout_helper()) 155 >> LogHeapWordSize); 156 } 157 jint nonstatic_field_size() { 158 assert(is_loaded(), "must be loaded"); 159 return _nonstatic_field_size; } 160 jint has_nonstatic_fields() { 161 assert(is_loaded(), "must be loaded"); 162 return _has_nonstatic_fields; } 163 jint nonstatic_oop_map_size() { 164 assert(is_loaded(), "must be loaded"); 165 return _nonstatic_oop_map_size; } 166 ciInstanceKlass* super(); 167 jint nof_implementors() { 168 ciInstanceKlass* impl; 169 assert(is_loaded(), "must be loaded"); 170 impl = implementor(); 171 if (impl == NULL) { 172 return 0; 173 } else if (impl != this) { 174 return 1; 175 } else { 176 return 2; 177 } 178 } 179 bool has_nonstatic_concrete_methods() { 180 assert(is_loaded(), "must be loaded"); 181 return _has_nonstatic_concrete_methods; 182 } 183 184 bool is_anonymous() { 185 return _is_anonymous; 186 } 187 188 ciInstanceKlass* get_canonical_holder(int offset); 189 ciField* get_field_by_offset(int field_offset, bool is_static); 190 ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static); 191 192 // total number of nonstatic fields (including inherited): 193 int nof_nonstatic_fields() { 194 if (_nonstatic_fields == NULL) 195 return compute_nonstatic_fields(); 196 else 197 return _nonstatic_fields->length(); 198 } 199 200 bool has_injected_fields() { 201 if (_has_injected_fields == -1) { 202 compute_injected_fields(); 203 } 204 return _has_injected_fields > 0 ? true : false; 205 } 206 207 bool has_object_fields() { 208 if (_has_object_fields == -1) { 209 compute_object_fields(); 210 } 211 return _has_object_fields > 0 ? true : false; 212 } 213 214 // nth nonstatic field (presented by ascending address) 215 ciField* nonstatic_field_at(int i) { 216 assert(_nonstatic_fields != NULL, ""); 217 return _nonstatic_fields->at(i); 218 } 219 220 ciInstanceKlass* unique_concrete_subklass(); 221 bool has_finalizable_subclass(); 222 223 bool contains_field_offset(int offset) { 224 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 225 } 226 227 // Get the instance of java.lang.Class corresponding to 228 // this klass. This instance is used for locking of 229 // synchronized static methods of this klass. 230 ciInstance* java_mirror(); 231 232 // Java access flags 233 bool is_public () { return flags().is_public(); } 234 bool is_final () { return flags().is_final(); } 235 bool is_super () { return flags().is_super(); } 236 bool is_interface () { return flags().is_interface(); } 237 bool is_abstract () { return flags().is_abstract(); } 238 239 ciMethod* find_method(ciSymbol* name, ciSymbol* signature); 240 // Note: To find a method from name and type strings, use ciSymbol::make, 241 // but consider adding to vmSymbols.hpp instead. 242 243 bool is_leaf_type(); 244 ciInstanceKlass* implementor(); 245 246 // Is the defining class loader of this class the default loader? 247 bool uses_default_loader() const; 248 249 bool is_java_lang_Object() const; 250 251 BasicType box_klass_type() const; 252 bool is_box_klass() const; 253 bool is_boxed_value_offset(int offset) const; 254 255 // Is this klass in the given package? 256 bool is_in_package(const char* packagename) { 257 return is_in_package(packagename, (int) strlen(packagename)); 258 } 259 bool is_in_package(const char* packagename, int len); 260 261 // What kind of ciObject is this? 262 bool is_instance_klass() const { return true; } 263 bool is_java_klass() const { return true; } 264 265 virtual ciKlass* exact_klass() { 266 if (is_loaded() && is_final() && !is_interface()) { 267 return this; 268 } 269 return NULL; 270 } 271 272 ciInstanceKlass* host_klass(); 273 274 bool can_be_instantiated() { 275 assert(is_loaded(), "must be loaded"); 276 return !is_interface() && !is_abstract(); 277 } 278 279 // Dump the current state of this klass for compilation replay. 280 virtual void dump_replay_data(outputStream* out); 281 }; 282 283 #endif // SHARE_VM_CI_CIINSTANCEKLASS_HPP