1 /* 2 * Copyright (c) 1997, 2024, 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_OOPS_INSTANCEKLASS_HPP 26 #define SHARE_OOPS_INSTANCEKLASS_HPP 27 28 #include "memory/referenceType.hpp" 29 #include "oops/annotations.hpp" 30 #include "oops/constMethod.hpp" 31 #include "oops/fieldInfo.hpp" 32 #include "oops/instanceKlassFlags.hpp" 33 #include "oops/instanceOop.hpp" 34 #include "runtime/handles.hpp" 35 #include "runtime/javaThread.hpp" 36 #include "utilities/accessFlags.hpp" 37 #include "utilities/align.hpp" 38 #include "utilities/growableArray.hpp" 39 #include "utilities/macros.hpp" 40 #if INCLUDE_JFR 41 #include "jfr/support/jfrKlassExtension.hpp" 42 #endif 43 44 class ConstantPool; 45 class DeoptimizationScope; 46 class klassItable; 47 class Monitor; 48 class RecordComponent; 49 50 // An InstanceKlass is the VM level representation of a Java class. 51 // It contains all information needed for at class at execution runtime. 52 53 // InstanceKlass embedded field layout (after declared fields): 54 // [EMBEDDED Java vtable ] size in words = vtable_len 55 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size 56 // The embedded nonstatic oop-map blocks are short pairs (offset, length) 57 // indicating where oops are located in instances of this klass. 58 // [EMBEDDED implementor of the interface] only exist for interface 59 60 61 // forward declaration for class -- see below for definition 62 #if INCLUDE_JVMTI 63 class BreakpointInfo; 64 #endif 65 class ClassFileParser; 66 class ClassFileStream; 67 class KlassDepChange; 68 class DependencyContext; 69 class fieldDescriptor; 70 class jniIdMapBase; 71 class JNIid; 72 class JvmtiCachedClassFieldMap; 73 class nmethodBucket; 74 class OopMapCache; 75 class InterpreterOopMap; 76 class PackageEntry; 77 class ModuleEntry; 78 79 // This is used in iterators below. 80 class FieldClosure: public StackObj { 81 public: 82 virtual void do_field(fieldDescriptor* fd) = 0; 83 }; 84 85 // Print fields. 86 // If "obj" argument to constructor is null, prints static fields, otherwise prints non-static fields. 87 class FieldPrinter: public FieldClosure { 88 oop _obj; 89 outputStream* _st; 90 public: 91 FieldPrinter(outputStream* st, oop obj = nullptr) : _obj(obj), _st(st) {} 92 void do_field(fieldDescriptor* fd); 93 }; 94 95 // Describes where oops are located in instances of this klass. 96 class OopMapBlock { 97 public: 98 // Byte offset of the first oop mapped by this block. 99 int offset() const { return _offset; } 100 void set_offset(int offset) { _offset = offset; } 101 102 // Number of oops in this block. 103 uint count() const { return _count; } 104 void set_count(uint count) { _count = count; } 105 106 void increment_count(int diff) { _count += diff; } 107 108 int offset_span() const { return _count * heapOopSize; } 109 110 int end_offset() const { 111 return offset() + offset_span(); 112 } 113 114 bool is_contiguous(int another_offset) const { 115 return another_offset == end_offset(); 116 } 117 118 // sizeof(OopMapBlock) in words. 119 static int size_in_words() { 120 return align_up((int)sizeof(OopMapBlock), wordSize) >> 121 LogBytesPerWord; 122 } 123 124 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) { 125 return a->offset() - b->offset(); 126 } 127 128 private: 129 int _offset; 130 uint _count; 131 }; 132 133 struct JvmtiCachedClassFileData; 134 135 class InstanceKlass: public Klass { 136 friend class VMStructs; 137 friend class JVMCIVMStructs; 138 friend class ClassFileParser; 139 friend class CompileReplay; 140 141 public: 142 static const KlassKind Kind = InstanceKlassKind; 143 144 protected: 145 InstanceKlass(const ClassFileParser& parser, KlassKind kind = Kind, ReferenceType reference_type = REF_NONE); 146 147 public: 148 InstanceKlass(); 149 150 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 151 // of the class loading & initialization procedure, and the use of the states. 152 enum ClassState : u1 { 153 allocated, // allocated (but not yet linked) 154 loaded, // loaded and inserted in class hierarchy (but not linked yet) 155 linked, // successfully linked/verified (but not initialized yet) 156 being_initialized, // currently running class initializer 157 fully_initialized, // initialized (successful final state) 158 initialization_error // error happened during initialization 159 }; 160 161 private: 162 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS); 163 164 protected: 165 // If you add a new field that points to any metaspace object, you 166 // must add this field to InstanceKlass::metaspace_pointers_do(). 167 168 // Annotations for this class 169 Annotations* _annotations; 170 // Package this class is defined in 171 PackageEntry* _package_entry; 172 // Array classes holding elements of this class. 173 ObjArrayKlass* volatile _array_klasses; 174 // Constant pool for this class. 175 ConstantPool* _constants; 176 // The InnerClasses attribute and EnclosingMethod attribute. The 177 // _inner_classes is an array of shorts. If the class has InnerClasses 178 // attribute, then the _inner_classes array begins with 4-tuples of shorts 179 // [inner_class_info_index, outer_class_info_index, 180 // inner_name_index, inner_class_access_flags] for the InnerClasses 181 // attribute. If the EnclosingMethod attribute exists, it occupies the 182 // last two shorts [class_index, method_index] of the array. If only 183 // the InnerClasses attribute exists, the _inner_classes array length is 184 // number_of_inner_classes * 4. If the class has both InnerClasses 185 // and EnclosingMethod attributes the _inner_classes array length is 186 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 187 Array<jushort>* _inner_classes; 188 189 // The NestMembers attribute. An array of shorts, where each is a 190 // class info index for the class that is a nest member. This data 191 // has not been validated. 192 Array<jushort>* _nest_members; 193 194 // Resolved nest-host klass: either true nest-host or self if we are not 195 // nested, or an error occurred resolving or validating the nominated 196 // nest-host. Can also be set directly by JDK API's that establish nest 197 // relationships. 198 // By always being set it makes nest-member access checks simpler. 199 InstanceKlass* _nest_host; 200 201 // The PermittedSubclasses attribute. An array of shorts, where each is a 202 // class info index for the class that is a permitted subclass. 203 Array<jushort>* _permitted_subclasses; 204 205 // The contents of the Record attribute. 206 Array<RecordComponent*>* _record_components; 207 208 // the source debug extension for this klass, null if not specified. 209 // Specified as UTF-8 string without terminating zero byte in the classfile, 210 // it is stored in the instanceklass as a null-terminated UTF-8 string 211 const char* _source_debug_extension; 212 213 // Number of heapOopSize words used by non-static fields in this klass 214 // (including inherited fields but after header_size()). 215 int _nonstatic_field_size; 216 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 217 int _nonstatic_oop_map_size; // size in words of nonstatic oop map blocks 218 int _itable_len; // length of Java itable (in words) 219 220 // The NestHost attribute. The class info index for the class 221 // that is the nest-host of this class. This data has not been validated. 222 u2 _nest_host_index; 223 u2 _this_class_index; // constant pool entry 224 u2 _static_oop_field_count; // number of static oop fields in this klass 225 226 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 227 228 // Class states are defined as ClassState (see above). 229 // Place the _init_state here to utilize the unused 2-byte after 230 // _idnum_allocated_count. 231 volatile ClassState _init_state; // state of class 232 233 u1 _reference_type; // reference type 234 235 // State is set either at parse time or while executing, atomically to not disturb other state 236 InstanceKlassFlags _misc_flags; 237 238 JavaThread* volatile _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization) 239 240 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 241 JNIid* _jni_ids; // First JNI identifier for static fields in this class 242 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or null if none 243 nmethodBucket* volatile _dep_context; // packed DependencyContext structure 244 uint64_t volatile _dep_context_last_cleaned; 245 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 246 #if INCLUDE_JVMTI 247 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 248 // Linked instanceKlasses of previous versions 249 InstanceKlass* _previous_versions; 250 // JVMTI fields can be moved to their own structure - see 6315920 251 // JVMTI: cached class file, before retransformable agent modified it in CFLH 252 JvmtiCachedClassFileData* _cached_class_file; 253 #endif 254 255 #if INCLUDE_JVMTI 256 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 257 #endif 258 259 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 260 NOT_PRODUCT(volatile int _shared_class_load_count;) // ensure a shared class is loaded only once 261 262 // Method array. 263 Array<Method*>* _methods; 264 // Default Method Array, concrete methods inherited from interfaces 265 Array<Method*>* _default_methods; 266 // Interfaces (InstanceKlass*s) this class declares locally to implement. 267 Array<InstanceKlass*>* _local_interfaces; 268 // Interfaces (InstanceKlass*s) this class implements transitively. 269 Array<InstanceKlass*>* _transitive_interfaces; 270 // Int array containing the original order of method in the class file (for JVMTI). 271 Array<int>* _method_ordering; 272 // Int array containing the vtable_indices for default_methods 273 // offset matches _default_methods offset 274 Array<int>* _default_vtable_indices; 275 276 // Fields information is stored in an UNSIGNED5 encoded stream (see fieldInfo.hpp) 277 Array<u1>* _fieldinfo_stream; 278 Array<FieldStatus>* _fields_status; 279 280 // embedded Java vtable follows here 281 // embedded Java itables follows here 282 // embedded static fields follows here 283 // embedded nonstatic oop-map blocks follows here 284 // embedded implementor of this interface follows here 285 // The embedded implementor only exists if the current klass is an 286 // interface. The possible values of the implementor fall into following 287 // three cases: 288 // null: no implementor. 289 // A Klass* that's not itself: one implementor. 290 // Itself: more than one implementors. 291 // 292 293 friend class SystemDictionary; 294 295 static bool _disable_method_binary_search; 296 297 // Controls finalizer registration 298 static bool _finalization_enabled; 299 300 public: 301 302 // Queries finalization state 303 static bool is_finalization_enabled() { return _finalization_enabled; } 304 305 // Sets finalization state 306 static void set_finalization_enabled(bool val) { _finalization_enabled = val; } 307 308 // The three BUILTIN class loader types 309 bool is_shared_boot_class() const { return _misc_flags.is_shared_boot_class(); } 310 bool is_shared_platform_class() const { return _misc_flags.is_shared_platform_class(); } 311 bool is_shared_app_class() const { return _misc_flags.is_shared_app_class(); } 312 // The UNREGISTERED class loader type 313 bool is_shared_unregistered_class() const { return _misc_flags.is_shared_unregistered_class(); } 314 315 // Check if the class can be shared in CDS 316 bool is_shareable() const; 317 318 bool shared_loading_failed() const { return _misc_flags.shared_loading_failed(); } 319 320 void set_shared_loading_failed() { _misc_flags.set_shared_loading_failed(true); } 321 322 #if INCLUDE_CDS 323 void set_shared_class_loader_type(s2 loader_type) { _misc_flags.set_shared_class_loader_type(loader_type); } 324 void assign_class_loader_type() { _misc_flags.assign_class_loader_type(_class_loader_data); } 325 #endif 326 327 bool has_nonstatic_fields() const { return _misc_flags.has_nonstatic_fields(); } 328 void set_has_nonstatic_fields(bool b) { _misc_flags.set_has_nonstatic_fields(b); } 329 330 bool has_localvariable_table() const { return _misc_flags.has_localvariable_table(); } 331 void set_has_localvariable_table(bool b) { _misc_flags.set_has_localvariable_table(b); } 332 333 // field sizes 334 int nonstatic_field_size() const { return _nonstatic_field_size; } 335 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 336 337 int static_field_size() const { return _static_field_size; } 338 void set_static_field_size(int size) { _static_field_size = size; } 339 340 int static_oop_field_count() const { return (int)_static_oop_field_count; } 341 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 342 343 // Java itable 344 int itable_length() const { return _itable_len; } 345 void set_itable_length(int len) { _itable_len = len; } 346 347 // array klasses 348 ObjArrayKlass* array_klasses() const { return _array_klasses; } 349 inline ObjArrayKlass* array_klasses_acquire() const; // load with acquire semantics 350 inline void release_set_array_klasses(ObjArrayKlass* k); // store with release semantics 351 void set_array_klasses(ObjArrayKlass* k) { _array_klasses = k; } 352 353 // methods 354 Array<Method*>* methods() const { return _methods; } 355 void set_methods(Array<Method*>* a) { _methods = a; } 356 Method* method_with_idnum(int idnum); 357 Method* method_with_orig_idnum(int idnum); 358 Method* method_with_orig_idnum(int idnum, int version); 359 360 // method ordering 361 Array<int>* method_ordering() const { return _method_ordering; } 362 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 363 void copy_method_ordering(const intArray* m, TRAPS); 364 365 // default_methods 366 Array<Method*>* default_methods() const { return _default_methods; } 367 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 368 369 // default method vtable_indices 370 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 371 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 372 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 373 374 // interfaces 375 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; } 376 void set_local_interfaces(Array<InstanceKlass*>* a) { 377 guarantee(_local_interfaces == nullptr || a == nullptr, "Just checking"); 378 _local_interfaces = a; } 379 380 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; } 381 void set_transitive_interfaces(Array<InstanceKlass*>* a) { 382 guarantee(_transitive_interfaces == nullptr || a == nullptr, "Just checking"); 383 _transitive_interfaces = a; 384 } 385 386 private: 387 friend class fieldDescriptor; 388 FieldInfo field(int index) const; 389 390 public: 391 int field_offset (int index) const { return field(index).offset(); } 392 int field_access_flags(int index) const { return field(index).access_flags().as_int(); } 393 FieldInfo::FieldFlags field_flags(int index) const { return field(index).field_flags(); } 394 FieldStatus field_status(int index) const { return fields_status()->at(index); } 395 inline Symbol* field_name (int index) const; 396 inline Symbol* field_signature (int index) const; 397 398 // Number of Java declared fields 399 int java_fields_count() const; 400 int total_fields_count() const; 401 402 Array<u1>* fieldinfo_stream() const { return _fieldinfo_stream; } 403 void set_fieldinfo_stream(Array<u1>* fis) { _fieldinfo_stream = fis; } 404 405 Array<FieldStatus>* fields_status() const {return _fields_status; } 406 void set_fields_status(Array<FieldStatus>* array) { _fields_status = array; } 407 408 // inner classes 409 Array<u2>* inner_classes() const { return _inner_classes; } 410 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 411 412 // nest members 413 Array<u2>* nest_members() const { return _nest_members; } 414 void set_nest_members(Array<u2>* m) { _nest_members = m; } 415 416 // nest-host index 417 jushort nest_host_index() const { return _nest_host_index; } 418 void set_nest_host_index(u2 i) { _nest_host_index = i; } 419 // dynamic nest member support 420 void set_nest_host(InstanceKlass* host); 421 422 // record components 423 Array<RecordComponent*>* record_components() const { return _record_components; } 424 void set_record_components(Array<RecordComponent*>* record_components) { 425 _record_components = record_components; 426 } 427 bool is_record() const; 428 429 // permitted subclasses 430 Array<u2>* permitted_subclasses() const { return _permitted_subclasses; } 431 void set_permitted_subclasses(Array<u2>* s) { _permitted_subclasses = s; } 432 433 private: 434 // Called to verify that k is a member of this nest - does not look at k's nest-host, 435 // nor does it resolve any CP entries or load any classes. 436 bool has_nest_member(JavaThread* current, InstanceKlass* k) const; 437 438 public: 439 // Call this only if you know that the nest host has been initialized. 440 InstanceKlass* nest_host_not_null() { 441 assert(_nest_host != nullptr, "must be"); 442 return _nest_host; 443 } 444 // Used to construct informative IllegalAccessError messages at a higher level, 445 // if there was an issue resolving or validating the nest host. 446 // Returns null if there was no error. 447 const char* nest_host_error(); 448 // Returns nest-host class, resolving and validating it if needed. 449 // Returns null if resolution is not possible from the calling context. 450 InstanceKlass* nest_host(TRAPS); 451 // Check if this klass is a nestmate of k - resolves this nest-host and k's 452 bool has_nestmate_access_to(InstanceKlass* k, TRAPS); 453 454 // Called to verify that k is a permitted subclass of this class 455 bool has_as_permitted_subclass(const InstanceKlass* k) const; 456 457 enum InnerClassAttributeOffset { 458 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 459 inner_class_inner_class_info_offset = 0, 460 inner_class_outer_class_info_offset = 1, 461 inner_class_inner_name_offset = 2, 462 inner_class_access_flags_offset = 3, 463 inner_class_next_offset = 4 464 }; 465 466 enum EnclosingMethodAttributeOffset { 467 enclosing_method_class_index_offset = 0, 468 enclosing_method_method_index_offset = 1, 469 enclosing_method_attribute_size = 2 470 }; 471 472 // package 473 PackageEntry* package() const { return _package_entry; } 474 ModuleEntry* module() const; 475 bool in_unnamed_package() const { return (_package_entry == nullptr); } 476 void set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS); 477 // If the package for the InstanceKlass is in the boot loader's package entry 478 // table then sets the classpath_index field so that 479 // get_system_package() will know to return a non-null value for the 480 // package's location. And, so that the package will be added to the list of 481 // packages returned by get_system_packages(). 482 // For packages whose classes are loaded from the boot loader class path, the 483 // classpath_index indicates which entry on the boot loader class path. 484 void set_classpath_index(s2 path_index); 485 bool is_same_class_package(const Klass* class2) const; 486 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const; 487 488 // find an enclosing class 489 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 490 491 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 492 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 493 494 private: 495 // Check prohibited package ("java/" only loadable by boot or platform loaders) 496 static void check_prohibited_package(Symbol* class_name, 497 ClassLoaderData* loader_data, 498 TRAPS); 499 500 JavaThread* init_thread() { return Atomic::load(&_init_thread); } 501 const char* init_thread_name() { 502 return init_thread()->name_raw(); 503 } 504 505 public: 506 // initialization state 507 bool is_loaded() const { return _init_state >= loaded; } 508 bool is_linked() const { return _init_state >= linked; } 509 bool is_initialized() const { return _init_state == fully_initialized; } 510 bool is_not_initialized() const { return _init_state < being_initialized; } 511 bool is_being_initialized() const { return _init_state == being_initialized; } 512 bool is_in_error_state() const { return _init_state == initialization_error; } 513 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 514 ClassState init_state() const { return _init_state; } 515 const char* init_state_name() const; 516 bool is_rewritten() const { return _misc_flags.rewritten(); } 517 518 // is this a sealed class 519 bool is_sealed() const; 520 521 // defineClass specified verification 522 bool should_verify_class() const { return _misc_flags.should_verify_class(); } 523 void set_should_verify_class(bool value) { _misc_flags.set_should_verify_class(value); } 524 525 // marking 526 bool is_marked_dependent() const { return _misc_flags.is_marked_dependent(); } 527 void set_is_marked_dependent(bool value) { _misc_flags.set_is_marked_dependent(value); } 528 529 // initialization (virtuals from Klass) 530 bool should_be_initialized() const; // means that initialize should be called 531 void initialize(TRAPS); 532 void link_class(TRAPS); 533 bool link_class_or_fail(TRAPS); // returns false on failure 534 void rewrite_class(TRAPS); 535 void link_methods(TRAPS); 536 Method* class_initializer() const; 537 538 // reference type 539 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 540 541 // this class cp index 542 u2 this_class_index() const { return _this_class_index; } 543 void set_this_class_index(u2 index) { _this_class_index = index; } 544 545 static ByteSize reference_type_offset() { return byte_offset_of(InstanceKlass, _reference_type); } 546 547 // find local field, returns true if found 548 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 549 // find field in direct superinterfaces, returns the interface in which the field is defined 550 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 551 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 552 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 553 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 554 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 555 556 // find a non-static or static field given its offset within the class. 557 bool contains_field_offset(int offset); 558 559 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 560 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 561 562 private: 563 inline static int quick_search(const Array<Method*>* methods, const Symbol* name); 564 565 public: 566 static void disable_method_binary_search() { 567 _disable_method_binary_search = true; 568 } 569 570 // find a local method (returns null if not found) 571 Method* find_method(const Symbol* name, const Symbol* signature) const; 572 static Method* find_method(const Array<Method*>* methods, 573 const Symbol* name, 574 const Symbol* signature); 575 576 // find a local method, but skip static methods 577 Method* find_instance_method(const Symbol* name, const Symbol* signature, 578 PrivateLookupMode private_mode) const; 579 static Method* find_instance_method(const Array<Method*>* methods, 580 const Symbol* name, 581 const Symbol* signature, 582 PrivateLookupMode private_mode); 583 584 // find a local method (returns null if not found) 585 Method* find_local_method(const Symbol* name, 586 const Symbol* signature, 587 OverpassLookupMode overpass_mode, 588 StaticLookupMode static_mode, 589 PrivateLookupMode private_mode) const; 590 591 // find a local method from given methods array (returns null if not found) 592 static Method* find_local_method(const Array<Method*>* methods, 593 const Symbol* name, 594 const Symbol* signature, 595 OverpassLookupMode overpass_mode, 596 StaticLookupMode static_mode, 597 PrivateLookupMode private_mode); 598 599 // find a local method index in methods or default_methods (returns -1 if not found) 600 static int find_method_index(const Array<Method*>* methods, 601 const Symbol* name, 602 const Symbol* signature, 603 OverpassLookupMode overpass_mode, 604 StaticLookupMode static_mode, 605 PrivateLookupMode private_mode); 606 607 // lookup operation (returns null if not found) 608 Method* uncached_lookup_method(const Symbol* name, 609 const Symbol* signature, 610 OverpassLookupMode overpass_mode, 611 PrivateLookupMode private_mode = PrivateLookupMode::find) const; 612 613 // lookup a method in all the interfaces that this class implements 614 // (returns null if not found) 615 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 616 617 // lookup a method in local defaults then in all interfaces 618 // (returns null if not found) 619 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 620 621 // Find method indices by name. If a method with the specified name is 622 // found the index to the first method is returned, and 'end' is filled in 623 // with the index of first non-name-matching method. If no method is found 624 // -1 is returned. 625 int find_method_by_name(const Symbol* name, int* end) const; 626 static int find_method_by_name(const Array<Method*>* methods, 627 const Symbol* name, int* end); 628 629 // constant pool 630 ConstantPool* constants() const { return _constants; } 631 void set_constants(ConstantPool* c) { _constants = c; } 632 633 // protection domain 634 oop protection_domain() const; 635 636 // signers 637 objArrayOop signers() const; 638 639 bool is_contended() const { return _misc_flags.is_contended(); } 640 void set_is_contended(bool value) { _misc_flags.set_is_contended(value); } 641 642 // source file name 643 Symbol* source_file_name() const; 644 u2 source_file_name_index() const; 645 void set_source_file_name_index(u2 sourcefile_index); 646 647 // minor and major version numbers of class file 648 u2 minor_version() const; 649 void set_minor_version(u2 minor_version); 650 u2 major_version() const; 651 void set_major_version(u2 major_version); 652 653 // source debug extension 654 const char* source_debug_extension() const { return _source_debug_extension; } 655 void set_source_debug_extension(const char* array, int length); 656 657 // nonstatic oop-map blocks 658 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 659 return oop_map_count * OopMapBlock::size_in_words(); 660 } 661 unsigned int nonstatic_oop_map_count() const { 662 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 663 } 664 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 665 void set_nonstatic_oop_map_size(int words) { 666 _nonstatic_oop_map_size = words; 667 } 668 669 bool has_contended_annotations() const { return _misc_flags.has_contended_annotations(); } 670 void set_has_contended_annotations(bool value) { _misc_flags.set_has_contended_annotations(value); } 671 672 #if INCLUDE_JVMTI 673 // Redefinition locking. Class can only be redefined by one thread at a time. 674 // The flag is in access_flags so that it can be set and reset using atomic 675 // operations, and not be reset by other misc_flag settings. 676 bool is_being_redefined() const { return _misc_flags.is_being_redefined(); } 677 void set_is_being_redefined(bool value) { _misc_flags.set_is_being_redefined(value); } 678 679 // RedefineClasses() support for previous versions: 680 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 681 void purge_previous_version_list(); 682 683 InstanceKlass* previous_versions() const { return _previous_versions; } 684 #else 685 InstanceKlass* previous_versions() const { return nullptr; } 686 #endif 687 688 InstanceKlass* get_klass_version(int version); 689 690 bool has_been_redefined() const { return _misc_flags.has_been_redefined(); } 691 void set_has_been_redefined() { _misc_flags.set_has_been_redefined(true); } 692 693 bool is_scratch_class() const { return _misc_flags.is_scratch_class(); } 694 void set_is_scratch_class() { _misc_flags.set_is_scratch_class(true); } 695 696 bool has_resolved_methods() const { return _misc_flags.has_resolved_methods(); } 697 void set_has_resolved_methods() { _misc_flags.set_has_resolved_methods(true); } 698 void set_has_resolved_methods(bool value) { _misc_flags.set_has_resolved_methods(value); } 699 700 public: 701 #if INCLUDE_JVMTI 702 703 void init_previous_versions() { 704 _previous_versions = nullptr; 705 } 706 707 private: 708 static bool _should_clean_previous_versions; 709 public: 710 static void purge_previous_versions(InstanceKlass* ik) { 711 if (ik->has_been_redefined()) { 712 ik->purge_previous_version_list(); 713 } 714 } 715 716 static bool should_clean_previous_versions_and_reset(); 717 static bool should_clean_previous_versions() { return _should_clean_previous_versions; } 718 719 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 720 void set_cached_class_file(JvmtiCachedClassFileData *data) { 721 _cached_class_file = data; 722 } 723 JvmtiCachedClassFileData * get_cached_class_file(); 724 jint get_cached_class_file_len(); 725 unsigned char * get_cached_class_file_bytes(); 726 727 // JVMTI: Support for caching of field indices, types, and offsets 728 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 729 _jvmti_cached_class_field_map = descriptor; 730 } 731 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 732 return _jvmti_cached_class_field_map; 733 } 734 #else // INCLUDE_JVMTI 735 736 static void purge_previous_versions(InstanceKlass* ik) { return; }; 737 static bool should_clean_previous_versions_and_reset() { return false; } 738 739 void set_cached_class_file(JvmtiCachedClassFileData *data) { 740 assert(data == nullptr, "unexpected call with JVMTI disabled"); 741 } 742 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)nullptr; } 743 744 #endif // INCLUDE_JVMTI 745 746 bool has_nonstatic_concrete_methods() const { return _misc_flags.has_nonstatic_concrete_methods(); } 747 void set_has_nonstatic_concrete_methods(bool b) { _misc_flags.set_has_nonstatic_concrete_methods(b); } 748 749 bool declares_nonstatic_concrete_methods() const { return _misc_flags.declares_nonstatic_concrete_methods(); } 750 void set_declares_nonstatic_concrete_methods(bool b) { _misc_flags.set_declares_nonstatic_concrete_methods(b); } 751 752 bool has_miranda_methods () const { return _misc_flags.has_miranda_methods(); } 753 void set_has_miranda_methods() { _misc_flags.set_has_miranda_methods(true); } 754 bool has_final_method() const { return _misc_flags.has_final_method(); } 755 void set_has_final_method() { _misc_flags.set_has_final_method(true); } 756 757 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 758 inline u2 next_method_idnum(); 759 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 760 761 // generics support 762 Symbol* generic_signature() const; 763 u2 generic_signature_index() const; 764 void set_generic_signature_index(u2 sig_index); 765 766 u2 enclosing_method_data(int offset) const; 767 u2 enclosing_method_class_index() const { 768 return enclosing_method_data(enclosing_method_class_index_offset); 769 } 770 u2 enclosing_method_method_index() { 771 return enclosing_method_data(enclosing_method_method_index_offset); 772 } 773 void set_enclosing_method_indices(u2 class_index, 774 u2 method_index); 775 776 // jmethodID support 777 jmethodID get_jmethod_id(const methodHandle& method_h); 778 void ensure_space_for_methodids(int start_offset = 0); 779 jmethodID jmethod_id_or_null(Method* method); 780 void update_methods_jmethod_cache(); 781 782 // annotations support 783 Annotations* annotations() const { return _annotations; } 784 void set_annotations(Annotations* anno) { _annotations = anno; } 785 786 AnnotationArray* class_annotations() const { 787 return (_annotations != nullptr) ? _annotations->class_annotations() : nullptr; 788 } 789 Array<AnnotationArray*>* fields_annotations() const { 790 return (_annotations != nullptr) ? _annotations->fields_annotations() : nullptr; 791 } 792 AnnotationArray* class_type_annotations() const { 793 return (_annotations != nullptr) ? _annotations->class_type_annotations() : nullptr; 794 } 795 Array<AnnotationArray*>* fields_type_annotations() const { 796 return (_annotations != nullptr) ? _annotations->fields_type_annotations() : nullptr; 797 } 798 // allocation 799 instanceOop allocate_instance(TRAPS); 800 static instanceOop allocate_instance(oop cls, TRAPS); 801 802 // additional member function to return a handle 803 instanceHandle allocate_instance_handle(TRAPS); 804 805 objArrayOop allocate_objArray(int n, int length, TRAPS); 806 // Helper function 807 static instanceOop register_finalizer(instanceOop i, TRAPS); 808 809 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 810 // if not, throw either an Error or an Exception. 811 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 812 813 // initialization 814 void call_class_initializer(TRAPS); 815 void set_initialization_state_and_notify(ClassState state, TRAPS); 816 817 // OopMapCache support 818 OopMapCache* oop_map_cache() { return _oop_map_cache; } 819 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 820 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 821 822 // JNI identifier support (for static fields - for jni performance) 823 JNIid* jni_ids() { return _jni_ids; } 824 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 825 JNIid* jni_id_for(int offset); 826 827 public: 828 // maintenance of deoptimization dependencies 829 inline DependencyContext dependencies(); 830 void mark_dependent_nmethods(DeoptimizationScope* deopt_scope, KlassDepChange& changes); 831 void add_dependent_nmethod(nmethod* nm); 832 void clean_dependency_context(); 833 // Setup link to hierarchy and deoptimize 834 void add_to_hierarchy(JavaThread* current); 835 836 // On-stack replacement support 837 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 838 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 839 void add_osr_nmethod(nmethod* n); 840 bool remove_osr_nmethod(nmethod* n); 841 int mark_osr_nmethods(DeoptimizationScope* deopt_scope, const Method* m); 842 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 843 844 #if INCLUDE_JVMTI 845 // Breakpoint support (see methods on Method* for details) 846 BreakpointInfo* breakpoints() const { return _breakpoints; }; 847 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 848 #endif 849 850 // support for stub routines 851 static ByteSize init_state_offset() { return byte_offset_of(InstanceKlass, _init_state); } 852 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;) 853 static ByteSize init_thread_offset() { return byte_offset_of(InstanceKlass, _init_thread); } 854 855 // subclass/subinterface checks 856 bool implements_interface(Klass* k) const; 857 bool is_same_or_direct_interface(Klass* k) const; 858 859 #ifdef ASSERT 860 // check whether this class or one of its superclasses was redefined 861 bool has_redefined_this_or_super() const; 862 #endif 863 864 // Access to the implementor of an interface. 865 InstanceKlass* implementor() const; 866 void set_implementor(InstanceKlass* ik); 867 int nof_implementors() const; 868 void add_implementor(InstanceKlass* ik); // ik is a new class that implements this interface 869 void init_implementor(); // initialize 870 871 private: 872 // link this class into the implementors list of every interface it implements 873 void process_interfaces(); 874 875 public: 876 // virtual operations from Klass 877 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 878 Array<InstanceKlass*>* transitive_interfaces); 879 bool can_be_primary_super_slow() const; 880 size_t oop_size(oop obj) const { return size_helper(); } 881 // slow because it's a virtual call and used for verifying the layout_helper. 882 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 883 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 884 885 // Iterators 886 void do_local_static_fields(FieldClosure* cl); 887 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 888 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 889 void print_nonstatic_fields(FieldClosure* cl); // including inherited and injected fields 890 891 void methods_do(void f(Method* method)); 892 893 static InstanceKlass* cast(Klass* k) { 894 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 895 } 896 897 static const InstanceKlass* cast(const Klass* k) { 898 assert(k != nullptr, "k should not be null"); 899 assert(k->is_instance_klass(), "cast to InstanceKlass"); 900 return static_cast<const InstanceKlass*>(k); 901 } 902 903 virtual InstanceKlass* java_super() const { 904 return (super() == nullptr) ? nullptr : cast(super()); 905 } 906 907 // Sizing (in words) 908 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 909 910 static int size(int vtable_length, int itable_length, 911 int nonstatic_oop_map_size, 912 bool is_interface) { 913 return align_metadata_size(header_size() + 914 vtable_length + 915 itable_length + 916 nonstatic_oop_map_size + 917 (is_interface ? (int)sizeof(Klass*)/wordSize : 0)); 918 } 919 920 int size() const { return size(vtable_length(), 921 itable_length(), 922 nonstatic_oop_map_size(), 923 is_interface()); 924 } 925 926 927 inline intptr_t* start_of_itable() const; 928 inline intptr_t* end_of_itable() const; 929 inline oop static_field_base_raw(); 930 931 inline OopMapBlock* start_of_nonstatic_oop_maps() const; 932 inline Klass** end_of_nonstatic_oop_maps() const; 933 934 inline InstanceKlass* volatile* adr_implementor() const; 935 936 // Use this to return the size of an instance in heap words: 937 int size_helper() const { 938 return layout_helper_to_size_helper(layout_helper()); 939 } 940 941 // This bit is initialized in classFileParser.cpp. 942 // It is false under any of the following conditions: 943 // - the class is abstract (including any interface) 944 // - the class size is larger than FastAllocateSizeLimit 945 // - the class is java/lang/Class, which cannot be allocated directly 946 bool can_be_fastpath_allocated() const { 947 return !layout_helper_needs_slow_path(layout_helper()); 948 } 949 950 // Java itable 951 klassItable itable() const; // return klassItable wrapper 952 Method* method_at_itable(InstanceKlass* holder, int index, TRAPS); 953 Method* method_at_itable_or_null(InstanceKlass* holder, int index, bool& itable_entry_found); 954 int vtable_index_of_interface_method(Method* method); 955 956 #if INCLUDE_JVMTI 957 void adjust_default_methods(bool* trace_name_printed); 958 #endif // INCLUDE_JVMTI 959 960 void clean_weak_instanceklass_links(); 961 private: 962 void clean_implementors_list(); 963 void clean_method_data(); 964 965 public: 966 // Explicit metaspace deallocation of fields 967 // For RedefineClasses and class file parsing errors, we need to deallocate 968 // instanceKlasses and the metadata they point to. 969 void deallocate_contents(ClassLoaderData* loader_data); 970 static void deallocate_methods(ClassLoaderData* loader_data, 971 Array<Method*>* methods); 972 void static deallocate_interfaces(ClassLoaderData* loader_data, 973 const Klass* super_klass, 974 Array<InstanceKlass*>* local_interfaces, 975 Array<InstanceKlass*>* transitive_interfaces); 976 void static deallocate_record_components(ClassLoaderData* loader_data, 977 Array<RecordComponent*>* record_component); 978 979 virtual bool on_stack() const; 980 981 // callbacks for actions during class unloading 982 static void unload_class(InstanceKlass* ik); 983 984 virtual void release_C_heap_structures(bool release_sub_metadata = true); 985 986 // Naming 987 const char* signature_name() const; 988 989 // Oop fields (and metadata) iterators 990 // 991 // The InstanceKlass iterators also visits the Object's klass. 992 993 // Forward iteration 994 public: 995 // Iterate over all oop fields in the oop maps. 996 template <typename T, class OopClosureType> 997 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 998 999 // Iterate over all oop fields and metadata. 1000 template <typename T, class OopClosureType> 1001 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 1002 1003 // Iterate over all oop fields in one oop map. 1004 template <typename T, class OopClosureType> 1005 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1006 1007 1008 // Reverse iteration 1009 // Iterate over all oop fields and metadata. 1010 template <typename T, class OopClosureType> 1011 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1012 1013 private: 1014 // Iterate over all oop fields in the oop maps. 1015 template <typename T, class OopClosureType> 1016 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1017 1018 // Iterate over all oop fields in one oop map. 1019 template <typename T, class OopClosureType> 1020 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1021 1022 1023 // Bounded range iteration 1024 public: 1025 // Iterate over all oop fields in the oop maps. 1026 template <typename T, class OopClosureType> 1027 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1028 1029 // Iterate over all oop fields and metadata. 1030 template <typename T, class OopClosureType> 1031 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1032 1033 private: 1034 // Iterate over all oop fields in one oop map. 1035 template <typename T, class OopClosureType> 1036 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1037 1038 1039 public: 1040 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1041 1042 private: 1043 // initialization state 1044 void set_init_state(ClassState state); 1045 void set_rewritten() { _misc_flags.set_rewritten(true); } 1046 void set_init_thread(JavaThread *thread) { 1047 assert((thread == JavaThread::current() && _init_thread == nullptr) || 1048 (thread == nullptr && _init_thread == JavaThread::current()), "Only one thread is allowed to own initialization"); 1049 Atomic::store(&_init_thread, thread); 1050 } 1051 1052 inline jmethodID* methods_jmethod_ids_acquire() const; 1053 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1054 // This nulls out jmethodIDs for all methods in 'klass' 1055 static void clear_jmethod_ids(InstanceKlass* klass); 1056 jmethodID update_jmethod_id(jmethodID* jmeths, Method* method, int idnum); 1057 1058 public: 1059 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1060 // Must be one per class and it has to be a VM internal object so java code 1061 // cannot lock it (like the mirror). 1062 // It has to be an object not a Mutex because it's held through java calls. 1063 oop init_lock() const; 1064 1065 // Returns the array class for the n'th dimension 1066 virtual ArrayKlass* array_klass(int n, TRAPS); 1067 virtual ArrayKlass* array_klass_or_null(int n); 1068 1069 // Returns the array class with this class as element type 1070 virtual ArrayKlass* array_klass(TRAPS); 1071 virtual ArrayKlass* array_klass_or_null(); 1072 1073 static void clean_initialization_error_table(); 1074 private: 1075 void fence_and_clear_init_lock(); 1076 1077 bool link_class_impl (TRAPS); 1078 bool verify_code (TRAPS); 1079 void initialize_impl (TRAPS); 1080 void initialize_super_interfaces (TRAPS); 1081 1082 void add_initialization_error(JavaThread* current, Handle exception); 1083 oop get_initialization_error(JavaThread* current); 1084 1085 // find a local method (returns null if not found) 1086 Method* find_method_impl(const Symbol* name, 1087 const Symbol* signature, 1088 OverpassLookupMode overpass_mode, 1089 StaticLookupMode static_mode, 1090 PrivateLookupMode private_mode) const; 1091 1092 static Method* find_method_impl(const Array<Method*>* methods, 1093 const Symbol* name, 1094 const Symbol* signature, 1095 OverpassLookupMode overpass_mode, 1096 StaticLookupMode static_mode, 1097 PrivateLookupMode private_mode); 1098 1099 #if INCLUDE_JVMTI 1100 // RedefineClasses support 1101 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1102 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1103 #endif 1104 // log class name to classlist 1105 void log_to_classlist() const; 1106 public: 1107 1108 #if INCLUDE_CDS 1109 // CDS support - remove and restore oops from metadata. Oops are not shared. 1110 virtual void remove_unshareable_info(); 1111 void remove_unshareable_flags(); 1112 virtual void remove_java_mirror(); 1113 void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, PackageEntry* pkg_entry, TRAPS); 1114 void init_shared_package_entry(); 1115 bool can_be_verified_at_dumptime() const; 1116 bool methods_contain_jsr_bytecode() const; 1117 void compute_has_loops_flag_for_methods(); 1118 #endif 1119 1120 jint compute_modifier_flags() const; 1121 1122 public: 1123 // JVMTI support 1124 jint jvmti_class_status() const; 1125 1126 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1127 1128 public: 1129 // Printing 1130 void print_on(outputStream* st) const; 1131 void print_value_on(outputStream* st) const; 1132 1133 void oop_print_value_on(oop obj, outputStream* st); 1134 1135 void oop_print_on (oop obj, outputStream* st); 1136 1137 #ifndef PRODUCT 1138 void print_dependent_nmethods(bool verbose = false); 1139 bool is_dependent_nmethod(nmethod* nm); 1140 bool verify_itable_index(int index); 1141 #endif 1142 1143 const char* internal_name() const; 1144 1145 // Verification 1146 void verify_on(outputStream* st); 1147 1148 void oop_verify_on(oop obj, outputStream* st); 1149 1150 // Logging 1151 void print_class_load_logging(ClassLoaderData* loader_data, 1152 const ModuleEntry* module_entry, 1153 const ClassFileStream* cfs) const; 1154 private: 1155 void print_class_load_cause_logging() const; 1156 void print_class_load_helper(ClassLoaderData* loader_data, 1157 const ModuleEntry* module_entry, 1158 const ClassFileStream* cfs) const; 1159 }; 1160 1161 // for adding methods 1162 // UNSET_IDNUM return means no more ids available 1163 inline u2 InstanceKlass::next_method_idnum() { 1164 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1165 return ConstMethod::UNSET_IDNUM; // no more ids available 1166 } else { 1167 return _idnum_allocated_count++; 1168 } 1169 } 1170 1171 class PrintClassClosure : public KlassClosure { 1172 private: 1173 outputStream* _st; 1174 bool _verbose; 1175 public: 1176 PrintClassClosure(outputStream* st, bool verbose); 1177 1178 void do_klass(Klass* k); 1179 }; 1180 1181 /* JNIid class for jfieldIDs only */ 1182 class JNIid: public CHeapObj<mtClass> { 1183 friend class VMStructs; 1184 private: 1185 Klass* _holder; 1186 JNIid* _next; 1187 int _offset; 1188 #ifdef ASSERT 1189 bool _is_static_field_id; 1190 #endif 1191 1192 public: 1193 // Accessors 1194 Klass* holder() const { return _holder; } 1195 int offset() const { return _offset; } 1196 JNIid* next() { return _next; } 1197 // Constructor 1198 JNIid(Klass* holder, int offset, JNIid* next); 1199 // Identifier lookup 1200 JNIid* find(int offset); 1201 1202 bool find_local_field(fieldDescriptor* fd) { 1203 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1204 } 1205 1206 static void deallocate(JNIid* id); 1207 // Debugging 1208 #ifdef ASSERT 1209 bool is_static_field_id() const { return _is_static_field_id; } 1210 void set_is_static_field_id() { _is_static_field_id = true; } 1211 #endif 1212 void verify(Klass* holder); 1213 }; 1214 1215 // An iterator that's used to access the inner classes indices in the 1216 // InstanceKlass::_inner_classes array. 1217 class InnerClassesIterator : public StackObj { 1218 private: 1219 Array<jushort>* _inner_classes; 1220 int _length; 1221 int _idx; 1222 public: 1223 1224 InnerClassesIterator(const InstanceKlass* k) { 1225 _inner_classes = k->inner_classes(); 1226 if (k->inner_classes() != nullptr) { 1227 _length = _inner_classes->length(); 1228 // The inner class array's length should be the multiple of 1229 // inner_class_next_offset if it only contains the InnerClasses 1230 // attribute data, or it should be 1231 // n*inner_class_next_offset+enclosing_method_attribute_size 1232 // if it also contains the EnclosingMethod data. 1233 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1234 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1235 "just checking"); 1236 // Remove the enclosing_method portion if exists. 1237 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1238 _length -= InstanceKlass::enclosing_method_attribute_size; 1239 } 1240 } else { 1241 _length = 0; 1242 } 1243 _idx = 0; 1244 } 1245 1246 int length() const { 1247 return _length; 1248 } 1249 1250 void next() { 1251 _idx += InstanceKlass::inner_class_next_offset; 1252 } 1253 1254 bool done() const { 1255 return (_idx >= _length); 1256 } 1257 1258 u2 inner_class_info_index() const { 1259 return _inner_classes->at( 1260 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1261 } 1262 1263 void set_inner_class_info_index(u2 index) { 1264 _inner_classes->at_put( 1265 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1266 } 1267 1268 u2 outer_class_info_index() const { 1269 return _inner_classes->at( 1270 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1271 } 1272 1273 void set_outer_class_info_index(u2 index) { 1274 _inner_classes->at_put( 1275 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1276 } 1277 1278 u2 inner_name_index() const { 1279 return _inner_classes->at( 1280 _idx + InstanceKlass::inner_class_inner_name_offset); 1281 } 1282 1283 void set_inner_name_index(u2 index) { 1284 _inner_classes->at_put( 1285 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1286 } 1287 1288 u2 inner_access_flags() const { 1289 return _inner_classes->at( 1290 _idx + InstanceKlass::inner_class_access_flags_offset); 1291 } 1292 }; 1293 1294 // Iterator over class hierarchy under a particular class. Implements depth-first pre-order traversal. 1295 // Usage: 1296 // for (ClassHierarchyIterator iter(root_klass); !iter.done(); iter.next()) { 1297 // Klass* k = iter.klass(); 1298 // ... 1299 // } 1300 class ClassHierarchyIterator : public StackObj { 1301 private: 1302 InstanceKlass* _root; 1303 Klass* _current; 1304 bool _visit_subclasses; 1305 1306 public: 1307 ClassHierarchyIterator(InstanceKlass* root) : _root(root), _current(root), _visit_subclasses(true) { 1308 assert(_root == _current, "required"); // initial state 1309 } 1310 1311 bool done() { 1312 return (_current == nullptr); 1313 } 1314 1315 // Make a step iterating over the class hierarchy under the root class. 1316 // Skips subclasses if requested. 1317 void next(); 1318 1319 Klass* klass() { 1320 assert(!done(), "sanity"); 1321 return _current; 1322 } 1323 1324 // Skip subclasses of the current class. 1325 void skip_subclasses() { 1326 _visit_subclasses = false; 1327 } 1328 }; 1329 1330 #endif // SHARE_OOPS_INSTANCEKLASS_HPP