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