1 /* 2 * Copyright (c) 1997, 2025, 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/allocation.hpp" 29 #include "memory/referenceType.hpp" 30 #include "oops/annotations.hpp" 31 #include "oops/constMethod.hpp" 32 #include "oops/fieldInfo.hpp" 33 #include "oops/instanceKlassFlags.hpp" 34 #include "oops/instanceOop.hpp" 35 #include "runtime/handles.hpp" 36 #include "runtime/javaThread.hpp" 37 #include "utilities/accessFlags.hpp" 38 #include "utilities/align.hpp" 39 #include "utilities/growableArray.hpp" 40 #include "utilities/macros.hpp" 41 #if INCLUDE_JFR 42 #include "jfr/support/jfrKlassExtension.hpp" 43 #endif 44 45 class ConstantPool; 46 class DeoptimizationScope; 47 class klassItable; 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 JNIid; 71 class JvmtiCachedClassFieldMap; 72 class nmethodBucket; 73 class OopMapCache; 74 class InterpreterOopMap; 75 class PackageEntry; 76 class ModuleEntry; 77 78 // This is used in iterators below. 79 class FieldClosure: public StackObj { 80 public: 81 virtual void do_field(fieldDescriptor* fd) = 0; 82 }; 83 84 // Print fields. 85 // If "obj" argument to constructor is null, prints static fields, otherwise prints non-static fields. 86 class FieldPrinter: public FieldClosure { 87 oop _obj; 88 outputStream* _st; 89 public: 90 FieldPrinter(outputStream* st, oop obj = nullptr) : _obj(obj), _st(st) {} 91 void do_field(fieldDescriptor* fd); 92 }; 93 94 // Describes where oops are located in instances of this klass. 95 class OopMapBlock { 96 public: 97 // Byte offset of the first oop mapped by this block. 98 int offset() const { return _offset; } 99 void set_offset(int offset) { _offset = offset; } 100 101 // Number of oops in this block. 102 uint count() const { return _count; } 103 void set_count(uint count) { _count = count; } 104 105 void increment_count(int diff) { _count += diff; } 106 107 int offset_span() const { return _count * heapOopSize; } 108 109 int end_offset() const { 110 return offset() + offset_span(); 111 } 112 113 bool is_contiguous(int another_offset) const { 114 return another_offset == end_offset(); 115 } 116 117 // sizeof(OopMapBlock) in words. 118 static int size_in_words() { 119 return align_up((int)sizeof(OopMapBlock), wordSize) >> 120 LogBytesPerWord; 121 } 122 123 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) { 124 return a->offset() - b->offset(); 125 } 126 127 private: 128 int _offset; 129 uint _count; 130 }; 131 132 struct JvmtiCachedClassFileData; 133 134 class InstanceKlass: public Klass { 135 friend class VMStructs; 136 friend class JVMCIVMStructs; 137 friend class ClassFileParser; 138 friend class CompileReplay; 139 140 public: 141 static const KlassKind Kind = InstanceKlassKind; 142 143 protected: 144 InstanceKlass(const ClassFileParser& parser, KlassKind kind = Kind, ReferenceType reference_type = REF_NONE); 145 146 void* operator new(size_t size, ClassLoaderData* loader_data, size_t word_size, bool use_class_space, TRAPS) throw(); 147 148 public: 149 InstanceKlass(); 150 151 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 152 // of the class loading & initialization procedure, and the use of the states. 153 enum ClassState : u1 { 154 allocated, // allocated (but not yet linked) 155 loaded, // loaded and inserted in class hierarchy (but not linked yet) 156 linked, // successfully linked/verified (but not initialized yet) 157 being_initialized, // currently running class initializer 158 fully_initialized, // initialized (successful final state) 159 initialization_error // error happened during initialization 160 }; 161 162 private: 163 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS); 164 165 protected: 166 // If you add a new field that points to any metaspace object, you 167 // must add this field to InstanceKlass::metaspace_pointers_do(). 168 169 // Annotations for this class 170 Annotations* _annotations; 171 // Package this class is defined in 172 PackageEntry* _package_entry; 173 // Array classes holding elements of this class. 174 ObjArrayKlass* volatile _array_klasses; 175 // Constant pool for this class. 176 ConstantPool* _constants; 177 // The InnerClasses attribute and EnclosingMethod attribute. The 178 // _inner_classes is an array of shorts. If the class has InnerClasses 179 // attribute, then the _inner_classes array begins with 4-tuples of shorts 180 // [inner_class_info_index, outer_class_info_index, 181 // inner_name_index, inner_class_access_flags] for the InnerClasses 182 // attribute. If the EnclosingMethod attribute exists, it occupies the 183 // last two shorts [class_index, method_index] of the array. If only 184 // the InnerClasses attribute exists, the _inner_classes array length is 185 // number_of_inner_classes * 4. If the class has both InnerClasses 186 // and EnclosingMethod attributes the _inner_classes array length is 187 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 188 Array<jushort>* _inner_classes; 189 190 // The NestMembers attribute. An array of shorts, where each is a 191 // class info index for the class that is a nest member. This data 192 // has not been validated. 193 Array<jushort>* _nest_members; 194 195 // Resolved nest-host klass: either true nest-host or self if we are not 196 // nested, or an error occurred resolving or validating the nominated 197 // nest-host. Can also be set directly by JDK API's that establish nest 198 // relationships. 199 // By always being set it makes nest-member access checks simpler. 200 InstanceKlass* _nest_host; 201 202 // The PermittedSubclasses attribute. An array of shorts, where each is a 203 // class info index for the class that is a permitted subclass. 204 Array<jushort>* _permitted_subclasses; 205 206 // The contents of the Record attribute. 207 Array<RecordComponent*>* _record_components; 208 209 // the source debug extension for this klass, null if not specified. 210 // Specified as UTF-8 string without terminating zero byte in the classfile, 211 // it is stored in the instanceklass as a null-terminated UTF-8 string 212 const char* _source_debug_extension; 213 214 // Number of heapOopSize words used by non-static fields in this klass 215 // (including inherited fields but after header_size()). 216 int _nonstatic_field_size; 217 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 218 int _nonstatic_oop_map_size; // size in words of nonstatic oop map blocks 219 int _itable_len; // length of Java itable (in words) 220 221 // The NestHost attribute. The class info index for the class 222 // that is the nest-host of this class. This data has not been validated. 223 u2 _nest_host_index; 224 u2 _this_class_index; // constant pool entry 225 u2 _static_oop_field_count; // number of static oop fields in this klass 226 227 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 228 229 // Class states are defined as ClassState (see above). 230 // Place the _init_state here to utilize the unused 2-byte after 231 // _idnum_allocated_count. 232 volatile ClassState _init_state; // state of class 233 234 u1 _reference_type; // reference type 235 236 // State is set either at parse time or while executing, atomically to not disturb other state 237 InstanceKlassFlags _misc_flags; 238 239 JavaThread* volatile _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization) 240 241 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 242 JNIid* _jni_ids; // First JNI identifier for static fields in this class 243 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or null if none 244 nmethodBucket* volatile _dep_context; // packed DependencyContext structure 245 uint64_t volatile _dep_context_last_cleaned; 246 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 247 #if INCLUDE_JVMTI 248 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 249 // Linked instanceKlasses of previous versions 250 InstanceKlass* _previous_versions; 251 // JVMTI fields can be moved to their own structure - see 6315920 252 // JVMTI: cached class file, before retransformable agent modified it in CFLH 253 JvmtiCachedClassFileData* _cached_class_file; 254 #endif 255 256 #if INCLUDE_JVMTI 257 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 258 #endif 259 260 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 261 NOT_PRODUCT(volatile int _shared_class_load_count;) // ensure a shared class is loaded only once 262 263 // Method array. 264 Array<Method*>* _methods; 265 // Default Method Array, concrete methods inherited from interfaces 266 Array<Method*>* _default_methods; 267 // Interfaces (InstanceKlass*s) this class declares locally to implement. 268 Array<InstanceKlass*>* _local_interfaces; 269 // Interfaces (InstanceKlass*s) this class implements transitively. 270 Array<InstanceKlass*>* _transitive_interfaces; 271 // Int array containing the original order of method in the class file (for JVMTI). 272 Array<int>* _method_ordering; 273 // Int array containing the vtable_indices for default_methods 274 // offset matches _default_methods offset 275 Array<int>* _default_vtable_indices; 276 277 // Fields information is stored in an UNSIGNED5 encoded stream (see fieldInfo.hpp) 278 Array<u1>* _fieldinfo_stream; 279 Array<FieldStatus>* _fields_status; 280 281 // embedded Java vtable follows here 282 // embedded Java itables follows here 283 // embedded static fields follows here 284 // embedded nonstatic oop-map blocks follows here 285 // embedded implementor of this interface follows here 286 // The embedded implementor only exists if the current klass is an 287 // interface. The possible values of the implementor fall into following 288 // three cases: 289 // null: no implementor. 290 // A Klass* that's not itself: one implementor. 291 // Itself: more than one implementors. 292 // 293 294 friend class SystemDictionary; 295 296 static bool _disable_method_binary_search; 297 298 // Controls finalizer registration 299 static bool _finalization_enabled; 300 301 public: 302 303 // Queries finalization state 304 static bool is_finalization_enabled() { return _finalization_enabled; } 305 306 // Sets finalization state 307 static void set_finalization_enabled(bool val) { _finalization_enabled = val; } 308 309 // The three BUILTIN class loader types 310 bool is_shared_boot_class() const { return _misc_flags.is_shared_boot_class(); } 311 bool is_shared_platform_class() const { return _misc_flags.is_shared_platform_class(); } 312 bool is_shared_app_class() const { return _misc_flags.is_shared_app_class(); } 313 // The UNREGISTERED class loader type 314 bool is_shared_unregistered_class() const { return _misc_flags.is_shared_unregistered_class(); } 315 316 // Check if the class can be shared in CDS 317 bool is_shareable() const; 318 319 bool shared_loading_failed() const { return _misc_flags.shared_loading_failed(); } 320 321 void set_shared_loading_failed() { _misc_flags.set_shared_loading_failed(true); } 322 323 #if INCLUDE_CDS 324 int shared_class_loader_type() const; 325 void set_shared_class_loader_type(s2 loader_type) { _misc_flags.set_shared_class_loader_type(loader_type); } 326 void assign_class_loader_type() { _misc_flags.assign_class_loader_type(_class_loader_data); } 327 #endif 328 329 bool has_nonstatic_fields() const { return _misc_flags.has_nonstatic_fields(); } 330 void set_has_nonstatic_fields(bool b) { _misc_flags.set_has_nonstatic_fields(b); } 331 332 bool has_localvariable_table() const { return _misc_flags.has_localvariable_table(); } 333 void set_has_localvariable_table(bool b) { _misc_flags.set_has_localvariable_table(b); } 334 335 // field sizes 336 int nonstatic_field_size() const { return _nonstatic_field_size; } 337 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 338 339 int static_field_size() const { return _static_field_size; } 340 void set_static_field_size(int size) { _static_field_size = size; } 341 342 int static_oop_field_count() const { return (int)_static_oop_field_count; } 343 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 344 345 // Java itable 346 int itable_length() const { return _itable_len; } 347 void set_itable_length(int len) { _itable_len = len; } 348 349 // array klasses 350 ObjArrayKlass* array_klasses() const { return _array_klasses; } 351 inline ObjArrayKlass* array_klasses_acquire() const; // load with acquire semantics 352 inline void release_set_array_klasses(ObjArrayKlass* k); // store with release semantics 353 void set_array_klasses(ObjArrayKlass* k) { _array_klasses = k; } 354 355 // methods 356 Array<Method*>* methods() const { return _methods; } 357 void set_methods(Array<Method*>* a) { _methods = a; } 358 Method* method_with_idnum(int idnum); 359 Method* method_with_orig_idnum(int idnum); 360 Method* method_with_orig_idnum(int idnum, int version); 361 362 // method ordering 363 Array<int>* method_ordering() const { return _method_ordering; } 364 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 365 void copy_method_ordering(const intArray* m, TRAPS); 366 367 // default_methods 368 Array<Method*>* default_methods() const { return _default_methods; } 369 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 370 371 // default method vtable_indices 372 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 373 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 374 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 375 376 // interfaces 377 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; } 378 void set_local_interfaces(Array<InstanceKlass*>* a) { 379 guarantee(_local_interfaces == nullptr || a == nullptr, "Just checking"); 380 _local_interfaces = a; } 381 382 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; } 383 void set_transitive_interfaces(Array<InstanceKlass*>* a) { 384 guarantee(_transitive_interfaces == nullptr || a == nullptr, "Just checking"); 385 _transitive_interfaces = a; 386 } 387 388 private: 389 friend class fieldDescriptor; 390 FieldInfo field(int index) const; 391 392 public: 393 int field_offset (int index) const { return field(index).offset(); } 394 int field_access_flags(int index) const { return field(index).access_flags().as_field_flags(); } 395 FieldInfo::FieldFlags field_flags(int index) const { return field(index).field_flags(); } 396 FieldStatus field_status(int index) const { return fields_status()->at(index); } 397 inline Symbol* field_name (int index) const; 398 inline Symbol* field_signature (int index) const; 399 400 // Number of Java declared fields 401 int java_fields_count() const; 402 int total_fields_count() const; 403 404 Array<u1>* fieldinfo_stream() const { return _fieldinfo_stream; } 405 void set_fieldinfo_stream(Array<u1>* fis) { _fieldinfo_stream = fis; } 406 407 Array<FieldStatus>* fields_status() const {return _fields_status; } 408 void set_fields_status(Array<FieldStatus>* array) { _fields_status = array; } 409 410 // inner classes 411 Array<u2>* inner_classes() const { return _inner_classes; } 412 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 413 414 // nest members 415 Array<u2>* nest_members() const { return _nest_members; } 416 void set_nest_members(Array<u2>* m) { _nest_members = m; } 417 418 // nest-host index 419 jushort nest_host_index() const { return _nest_host_index; } 420 void set_nest_host_index(u2 i) { _nest_host_index = i; } 421 // dynamic nest member support 422 void set_nest_host(InstanceKlass* host); 423 424 // record components 425 Array<RecordComponent*>* record_components() const { return _record_components; } 426 void set_record_components(Array<RecordComponent*>* record_components) { 427 _record_components = record_components; 428 } 429 bool is_record() const; 430 431 // test for enum class (or possibly an anonymous subclass within a sealed enum) 432 bool is_enum_subclass() const; 433 434 // permitted subclasses 435 Array<u2>* permitted_subclasses() const { return _permitted_subclasses; } 436 void set_permitted_subclasses(Array<u2>* s) { _permitted_subclasses = s; } 437 438 private: 439 // Called to verify that k is a member of this nest - does not look at k's nest-host, 440 // nor does it resolve any CP entries or load any classes. 441 bool has_nest_member(JavaThread* current, InstanceKlass* k) const; 442 443 public: 444 // Call this only if you know that the nest host has been initialized. 445 InstanceKlass* nest_host_not_null() { 446 assert(_nest_host != nullptr, "must be"); 447 return _nest_host; 448 } 449 // Used to construct informative IllegalAccessError messages at a higher level, 450 // if there was an issue resolving or validating the nest host. 451 // Returns null if there was no error. 452 const char* nest_host_error(); 453 // Returns nest-host class, resolving and validating it if needed. 454 // Returns null if resolution is not possible from the calling context. 455 InstanceKlass* nest_host(TRAPS); 456 // Check if this klass is a nestmate of k - resolves this nest-host and k's 457 bool has_nestmate_access_to(InstanceKlass* k, TRAPS); 458 459 // Called to verify that k is a permitted subclass of this class. 460 // The incoming stringStream is used for logging, and for the caller to create 461 // a detailed exception message on failure. 462 bool has_as_permitted_subclass(const InstanceKlass* k, stringStream& ss) const; 463 464 enum InnerClassAttributeOffset { 465 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 466 inner_class_inner_class_info_offset = 0, 467 inner_class_outer_class_info_offset = 1, 468 inner_class_inner_name_offset = 2, 469 inner_class_access_flags_offset = 3, 470 inner_class_next_offset = 4 471 }; 472 473 enum EnclosingMethodAttributeOffset { 474 enclosing_method_class_index_offset = 0, 475 enclosing_method_method_index_offset = 1, 476 enclosing_method_attribute_size = 2 477 }; 478 479 // package 480 PackageEntry* package() const { return _package_entry; } 481 ModuleEntry* module() const; 482 bool in_javabase_module() const; 483 bool in_unnamed_package() const { return (_package_entry == nullptr); } 484 void set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS); 485 // If the package for the InstanceKlass is in the boot loader's package entry 486 // table then sets the classpath_index field so that 487 // get_system_package() will know to return a non-null value for the 488 // package's location. And, so that the package will be added to the list of 489 // packages returned by get_system_packages(). 490 // For packages whose classes are loaded from the boot loader class path, the 491 // classpath_index indicates which entry on the boot loader class path. 492 void set_classpath_index(s2 path_index); 493 bool is_same_class_package(const Klass* class2) const; 494 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const; 495 496 // find an enclosing class 497 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 498 499 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 500 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 501 502 private: 503 // Check prohibited package ("java/" only loadable by boot or platform loaders) 504 static void check_prohibited_package(Symbol* class_name, 505 ClassLoaderData* loader_data, 506 TRAPS); 507 508 JavaThread* init_thread() { return Atomic::load(&_init_thread); } 509 const char* init_thread_name() { 510 return init_thread()->name_raw(); 511 } 512 513 public: 514 // initialization state 515 bool is_loaded() const { return init_state() >= loaded; } 516 bool is_linked() const { return init_state() >= linked; } 517 bool is_initialized() const { return init_state() == fully_initialized; } 518 bool is_not_initialized() const { return init_state() < being_initialized; } 519 bool is_being_initialized() const { return init_state() == being_initialized; } 520 bool is_in_error_state() const { return init_state() == initialization_error; } 521 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 522 ClassState init_state() const { return Atomic::load_acquire(&_init_state); } 523 const char* init_state_name() const; 524 bool is_rewritten() const { return _misc_flags.rewritten(); } 525 526 static const char* state2name(ClassState state); 527 528 // is this a sealed class 529 bool is_sealed() const; 530 531 // defineClass specified verification 532 bool should_verify_class() const { return _misc_flags.should_verify_class(); } 533 void set_should_verify_class(bool value) { _misc_flags.set_should_verify_class(value); } 534 535 // marking 536 bool is_marked_dependent() const { return _misc_flags.is_marked_dependent(); } 537 void set_is_marked_dependent(bool value) { _misc_flags.set_is_marked_dependent(value); } 538 539 // initialization (virtuals from Klass) 540 bool should_be_initialized() const; // means that initialize should be called 541 void initialize_with_aot_initialized_mirror(TRAPS); 542 void assert_no_clinit_will_run_for_aot_initialized_class() const NOT_DEBUG_RETURN; 543 void initialize(TRAPS); 544 void link_class(TRAPS); 545 bool link_class_or_fail(TRAPS); // returns false on failure 546 void rewrite_class(TRAPS); 547 void link_methods(TRAPS); 548 Method* class_initializer() const; 549 bool interface_needs_clinit_execution_as_super(bool also_check_supers=true) const; 550 551 // reference type 552 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 553 554 // this class cp index 555 u2 this_class_index() const { return _this_class_index; } 556 void set_this_class_index(u2 index) { _this_class_index = index; } 557 558 static ByteSize reference_type_offset() { return byte_offset_of(InstanceKlass, _reference_type); } 559 560 // find local field, returns true if found 561 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 562 // find field in direct superinterfaces, returns the interface in which the field is defined 563 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 564 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 565 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 566 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 567 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 568 569 // find a non-static or static field given its offset within the class. 570 bool contains_field_offset(int offset); 571 572 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 573 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 574 575 private: 576 inline static int quick_search(const Array<Method*>* methods, const Symbol* name); 577 578 public: 579 static void disable_method_binary_search() { 580 _disable_method_binary_search = true; 581 } 582 583 // find a local method (returns null if not found) 584 Method* find_method(const Symbol* name, const Symbol* signature) const; 585 static Method* find_method(const Array<Method*>* methods, 586 const Symbol* name, 587 const Symbol* signature); 588 589 // find a local method, but skip static methods 590 Method* find_instance_method(const Symbol* name, const Symbol* signature, 591 PrivateLookupMode private_mode) const; 592 static Method* find_instance_method(const Array<Method*>* methods, 593 const Symbol* name, 594 const Symbol* signature, 595 PrivateLookupMode private_mode); 596 597 // find a local method (returns null if not found) 598 Method* find_local_method(const Symbol* name, 599 const Symbol* signature, 600 OverpassLookupMode overpass_mode, 601 StaticLookupMode static_mode, 602 PrivateLookupMode private_mode) const; 603 604 // find a local method from given methods array (returns null if not found) 605 static Method* find_local_method(const Array<Method*>* methods, 606 const Symbol* name, 607 const Symbol* signature, 608 OverpassLookupMode overpass_mode, 609 StaticLookupMode static_mode, 610 PrivateLookupMode private_mode); 611 612 // find a local method index in methods or default_methods (returns -1 if not found) 613 static int find_method_index(const Array<Method*>* methods, 614 const Symbol* name, 615 const Symbol* signature, 616 OverpassLookupMode overpass_mode, 617 StaticLookupMode static_mode, 618 PrivateLookupMode private_mode); 619 620 // lookup operation (returns null if not found) 621 Method* uncached_lookup_method(const Symbol* name, 622 const Symbol* signature, 623 OverpassLookupMode overpass_mode, 624 PrivateLookupMode private_mode = PrivateLookupMode::find) const; 625 626 // lookup a method in all the interfaces that this class implements 627 // (returns null if not found) 628 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 629 630 // lookup a method in local defaults then in all interfaces 631 // (returns null if not found) 632 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 633 634 // Find method indices by name. If a method with the specified name is 635 // found the index to the first method is returned, and 'end' is filled in 636 // with the index of first non-name-matching method. If no method is found 637 // -1 is returned. 638 int find_method_by_name(const Symbol* name, int* end) const; 639 static int find_method_by_name(const Array<Method*>* methods, 640 const Symbol* name, int* end); 641 642 // constant pool 643 ConstantPool* constants() const { return _constants; } 644 void set_constants(ConstantPool* c) { _constants = c; } 645 646 // protection domain 647 oop protection_domain() const; 648 649 // signers 650 objArrayOop signers() const; 651 652 bool is_contended() const { return _misc_flags.is_contended(); } 653 void set_is_contended(bool value) { _misc_flags.set_is_contended(value); } 654 655 // source file name 656 Symbol* source_file_name() const; 657 u2 source_file_name_index() const; 658 void set_source_file_name_index(u2 sourcefile_index); 659 660 // minor and major version numbers of class file 661 u2 minor_version() const; 662 void set_minor_version(u2 minor_version); 663 u2 major_version() const; 664 void set_major_version(u2 major_version); 665 666 // source debug extension 667 const char* source_debug_extension() const { return _source_debug_extension; } 668 void set_source_debug_extension(const char* array, int length); 669 670 // nonstatic oop-map blocks 671 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 672 return oop_map_count * OopMapBlock::size_in_words(); 673 } 674 unsigned int nonstatic_oop_map_count() const { 675 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 676 } 677 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 678 void set_nonstatic_oop_map_size(int words) { 679 _nonstatic_oop_map_size = words; 680 } 681 682 bool has_contended_annotations() const { return _misc_flags.has_contended_annotations(); } 683 void set_has_contended_annotations(bool value) { _misc_flags.set_has_contended_annotations(value); } 684 685 #if INCLUDE_JVMTI 686 // Redefinition locking. Class can only be redefined by one thread at a time. 687 bool is_being_redefined() const { return _misc_flags.is_being_redefined(); } 688 void set_is_being_redefined(bool value) { _misc_flags.set_is_being_redefined(value); } 689 690 // RedefineClasses() support for previous versions: 691 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 692 void purge_previous_version_list(); 693 694 InstanceKlass* previous_versions() const { return _previous_versions; } 695 #else 696 InstanceKlass* previous_versions() const { return nullptr; } 697 #endif 698 699 InstanceKlass* get_klass_version(int version); 700 701 bool has_been_redefined() const { return _misc_flags.has_been_redefined(); } 702 void set_has_been_redefined() { _misc_flags.set_has_been_redefined(true); } 703 704 bool is_scratch_class() const { return _misc_flags.is_scratch_class(); } 705 void set_is_scratch_class() { _misc_flags.set_is_scratch_class(true); } 706 707 bool has_resolved_methods() const { return _misc_flags.has_resolved_methods(); } 708 void set_has_resolved_methods() { _misc_flags.set_has_resolved_methods(true); } 709 void set_has_resolved_methods(bool value) { _misc_flags.set_has_resolved_methods(value); } 710 711 public: 712 #if INCLUDE_JVMTI 713 714 void init_previous_versions() { 715 _previous_versions = nullptr; 716 } 717 718 private: 719 static bool _should_clean_previous_versions; 720 public: 721 static void purge_previous_versions(InstanceKlass* ik) { 722 if (ik->has_been_redefined()) { 723 ik->purge_previous_version_list(); 724 } 725 } 726 727 static bool should_clean_previous_versions_and_reset(); 728 static bool should_clean_previous_versions() { return _should_clean_previous_versions; } 729 730 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 731 void set_cached_class_file(JvmtiCachedClassFileData *data) { 732 _cached_class_file = data; 733 } 734 JvmtiCachedClassFileData * get_cached_class_file(); 735 jint get_cached_class_file_len(); 736 unsigned char * get_cached_class_file_bytes(); 737 738 // JVMTI: Support for caching of field indices, types, and offsets 739 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 740 _jvmti_cached_class_field_map = descriptor; 741 } 742 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 743 return _jvmti_cached_class_field_map; 744 } 745 #else // INCLUDE_JVMTI 746 747 static void purge_previous_versions(InstanceKlass* ik) { return; }; 748 static bool should_clean_previous_versions_and_reset() { return false; } 749 750 void set_cached_class_file(JvmtiCachedClassFileData *data) { 751 assert(data == nullptr, "unexpected call with JVMTI disabled"); 752 } 753 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)nullptr; } 754 755 #endif // INCLUDE_JVMTI 756 757 bool has_nonstatic_concrete_methods() const { return _misc_flags.has_nonstatic_concrete_methods(); } 758 void set_has_nonstatic_concrete_methods(bool b) { _misc_flags.set_has_nonstatic_concrete_methods(b); } 759 760 bool declares_nonstatic_concrete_methods() const { return _misc_flags.declares_nonstatic_concrete_methods(); } 761 void set_declares_nonstatic_concrete_methods(bool b) { _misc_flags.set_declares_nonstatic_concrete_methods(b); } 762 763 bool has_miranda_methods () const { return _misc_flags.has_miranda_methods(); } 764 void set_has_miranda_methods() { _misc_flags.set_has_miranda_methods(true); } 765 bool has_final_method() const { return _misc_flags.has_final_method(); } 766 void set_has_final_method() { _misc_flags.set_has_final_method(true); } 767 768 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 769 inline u2 next_method_idnum(); 770 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 771 772 // generics support 773 Symbol* generic_signature() const; 774 u2 generic_signature_index() const; 775 void set_generic_signature_index(u2 sig_index); 776 777 u2 enclosing_method_data(int offset) const; 778 u2 enclosing_method_class_index() const { 779 return enclosing_method_data(enclosing_method_class_index_offset); 780 } 781 u2 enclosing_method_method_index() { 782 return enclosing_method_data(enclosing_method_method_index_offset); 783 } 784 void set_enclosing_method_indices(u2 class_index, 785 u2 method_index); 786 787 // jmethodID support 788 jmethodID get_jmethod_id(const methodHandle& method_h); 789 void ensure_space_for_methodids(int start_offset = 0); 790 jmethodID jmethod_id_or_null(Method* method); 791 void update_methods_jmethod_cache(); 792 793 // annotations support 794 Annotations* annotations() const { return _annotations; } 795 void set_annotations(Annotations* anno) { _annotations = anno; } 796 797 AnnotationArray* class_annotations() const { 798 return (_annotations != nullptr) ? _annotations->class_annotations() : nullptr; 799 } 800 Array<AnnotationArray*>* fields_annotations() const { 801 return (_annotations != nullptr) ? _annotations->fields_annotations() : nullptr; 802 } 803 AnnotationArray* class_type_annotations() const { 804 return (_annotations != nullptr) ? _annotations->class_type_annotations() : nullptr; 805 } 806 Array<AnnotationArray*>* fields_type_annotations() const { 807 return (_annotations != nullptr) ? _annotations->fields_type_annotations() : nullptr; 808 } 809 // allocation 810 instanceOop allocate_instance(TRAPS); 811 static instanceOop allocate_instance(oop cls, const char* who, TRAPS); 812 813 // additional member function to return a handle 814 instanceHandle allocate_instance_handle(TRAPS); 815 816 objArrayOop allocate_objArray(int n, int length, TRAPS); 817 // Helper function 818 static instanceOop register_finalizer(instanceOop i, TRAPS); 819 820 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 821 // if not, throw either an Error or an Exception. 822 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 823 824 // initialization 825 void call_class_initializer(TRAPS); 826 void set_initialization_state_and_notify(ClassState state, TRAPS); 827 828 // OopMapCache support 829 OopMapCache* oop_map_cache() { return _oop_map_cache; } 830 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 831 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 832 833 // JNI identifier support (for static fields - for jni performance) 834 JNIid* jni_ids() { return _jni_ids; } 835 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 836 JNIid* jni_id_for(int offset); 837 838 public: 839 // maintenance of deoptimization dependencies 840 inline DependencyContext dependencies(); 841 void mark_dependent_nmethods(DeoptimizationScope* deopt_scope, KlassDepChange& changes); 842 void add_dependent_nmethod(nmethod* nm); 843 void clean_dependency_context(); 844 // Setup link to hierarchy and deoptimize 845 void add_to_hierarchy(JavaThread* current); 846 847 // On-stack replacement support 848 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 849 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 850 void add_osr_nmethod(nmethod* n); 851 bool remove_osr_nmethod(nmethod* n); 852 int mark_osr_nmethods(DeoptimizationScope* deopt_scope, const Method* m); 853 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 854 855 #if INCLUDE_JVMTI 856 // Breakpoint support (see methods on Method* for details) 857 BreakpointInfo* breakpoints() const { return _breakpoints; }; 858 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 859 #endif 860 861 // support for stub routines 862 static ByteSize init_state_offset() { return byte_offset_of(InstanceKlass, _init_state); } 863 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;) 864 static ByteSize init_thread_offset() { return byte_offset_of(InstanceKlass, _init_thread); } 865 866 // subclass/subinterface checks 867 bool implements_interface(Klass* k) const; 868 bool is_same_or_direct_interface(Klass* k) const; 869 870 #ifdef ASSERT 871 // check whether this class or one of its superclasses was redefined 872 bool has_redefined_this_or_super() const; 873 #endif 874 875 // Access to the implementor of an interface. 876 InstanceKlass* implementor() const; 877 void set_implementor(InstanceKlass* ik); 878 int nof_implementors() const; 879 void add_implementor(InstanceKlass* ik); // ik is a new class that implements this interface 880 void init_implementor(); // initialize 881 882 private: 883 // link this class into the implementors list of every interface it implements 884 void process_interfaces(); 885 886 public: 887 // virtual operations from Klass 888 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 889 Array<InstanceKlass*>* transitive_interfaces); 890 bool can_be_primary_super_slow() const; 891 size_t oop_size(oop obj) const { return size_helper(); } 892 // slow because it's a virtual call and used for verifying the layout_helper. 893 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 894 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 895 896 // Iterators 897 void do_local_static_fields(FieldClosure* cl); 898 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 899 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 900 void print_nonstatic_fields(FieldClosure* cl); // including inherited and injected fields 901 902 void methods_do(void f(Method* method)); 903 904 static InstanceKlass* cast(Klass* k) { 905 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 906 } 907 908 static const InstanceKlass* cast(const Klass* k) { 909 assert(k != nullptr, "k should not be null"); 910 assert(k->is_instance_klass(), "cast to InstanceKlass"); 911 return static_cast<const InstanceKlass*>(k); 912 } 913 914 virtual InstanceKlass* java_super() const { 915 return (super() == nullptr) ? nullptr : cast(super()); 916 } 917 918 // Sizing (in words) 919 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 920 921 static int size(int vtable_length, int itable_length, 922 int nonstatic_oop_map_size, 923 bool is_interface) { 924 return align_metadata_size(header_size() + 925 vtable_length + 926 itable_length + 927 nonstatic_oop_map_size + 928 (is_interface ? (int)sizeof(Klass*)/wordSize : 0)); 929 } 930 931 int size() const { return size(vtable_length(), 932 itable_length(), 933 nonstatic_oop_map_size(), 934 is_interface()); 935 } 936 937 938 inline intptr_t* start_of_itable() const; 939 inline intptr_t* end_of_itable() const; 940 inline oop static_field_base_raw(); 941 942 inline OopMapBlock* start_of_nonstatic_oop_maps() const; 943 inline Klass** end_of_nonstatic_oop_maps() const; 944 945 inline InstanceKlass* volatile* adr_implementor() const; 946 947 // Use this to return the size of an instance in heap words: 948 int size_helper() const { 949 return layout_helper_to_size_helper(layout_helper()); 950 } 951 952 // This bit is initialized in classFileParser.cpp. 953 // It is false under any of the following conditions: 954 // - the class is abstract (including any interface) 955 // - the class size is larger than FastAllocateSizeLimit 956 // - the class is java/lang/Class, which cannot be allocated directly 957 bool can_be_fastpath_allocated() const { 958 return !layout_helper_needs_slow_path(layout_helper()); 959 } 960 961 // Java itable 962 klassItable itable() const; // return klassItable wrapper 963 Method* method_at_itable(InstanceKlass* holder, int index, TRAPS); 964 Method* method_at_itable_or_null(InstanceKlass* holder, int index, bool& itable_entry_found); 965 int vtable_index_of_interface_method(Method* method); 966 967 #if INCLUDE_JVMTI 968 void adjust_default_methods(bool* trace_name_printed); 969 #endif // INCLUDE_JVMTI 970 971 void clean_weak_instanceklass_links(); 972 private: 973 void clean_implementors_list(); 974 void clean_method_data(); 975 976 public: 977 // Explicit metaspace deallocation of fields 978 // For RedefineClasses and class file parsing errors, we need to deallocate 979 // instanceKlasses and the metadata they point to. 980 void deallocate_contents(ClassLoaderData* loader_data); 981 static void deallocate_methods(ClassLoaderData* loader_data, 982 Array<Method*>* methods); 983 void static deallocate_interfaces(ClassLoaderData* loader_data, 984 const Klass* super_klass, 985 Array<InstanceKlass*>* local_interfaces, 986 Array<InstanceKlass*>* transitive_interfaces); 987 void static deallocate_record_components(ClassLoaderData* loader_data, 988 Array<RecordComponent*>* record_component); 989 990 virtual bool on_stack() const; 991 992 // callbacks for actions during class unloading 993 static void unload_class(InstanceKlass* ik); 994 995 virtual void release_C_heap_structures(bool release_sub_metadata = true); 996 997 // Naming 998 const char* signature_name() const; 999 1000 // Oop fields (and metadata) iterators 1001 // 1002 // The InstanceKlass iterators also visits the Object's klass. 1003 1004 // Forward iteration 1005 public: 1006 // Iterate over all oop fields in the oop maps. 1007 template <typename T, class OopClosureType> 1008 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1009 1010 // Iterate over all oop fields and metadata. 1011 template <typename T, class OopClosureType> 1012 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 1013 1014 // Iterate over all oop fields in one oop map. 1015 template <typename T, class OopClosureType> 1016 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1017 1018 1019 // Reverse iteration 1020 // Iterate over all oop fields and metadata. 1021 template <typename T, class OopClosureType> 1022 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1023 1024 private: 1025 // Iterate over all oop fields in the oop maps. 1026 template <typename T, class OopClosureType> 1027 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1028 1029 // Iterate over all oop fields in one oop map. 1030 template <typename T, class OopClosureType> 1031 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1032 1033 1034 // Bounded range iteration 1035 public: 1036 // Iterate over all oop fields in the oop maps. 1037 template <typename T, class OopClosureType> 1038 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1039 1040 // Iterate over all oop fields and metadata. 1041 template <typename T, class OopClosureType> 1042 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1043 1044 private: 1045 // Iterate over all oop fields in one oop map. 1046 template <typename T, class OopClosureType> 1047 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1048 1049 1050 public: 1051 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1052 1053 private: 1054 // initialization state 1055 void set_init_state(ClassState state); 1056 void set_rewritten() { _misc_flags.set_rewritten(true); } 1057 void set_init_thread(JavaThread *thread) { 1058 assert((thread == JavaThread::current() && _init_thread == nullptr) || 1059 (thread == nullptr && _init_thread == JavaThread::current()), "Only one thread is allowed to own initialization"); 1060 Atomic::store(&_init_thread, thread); 1061 } 1062 1063 inline jmethodID* methods_jmethod_ids_acquire() const; 1064 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1065 // This nulls out jmethodIDs for all methods in 'klass' 1066 static void clear_jmethod_ids(InstanceKlass* klass); 1067 jmethodID update_jmethod_id(jmethodID* jmeths, Method* method, int idnum); 1068 1069 public: 1070 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1071 // Must be one per class and it has to be a VM internal object so java code 1072 // cannot lock it (like the mirror). 1073 // It has to be an object not a Mutex because it's held through java calls. 1074 oop init_lock() const; 1075 1076 // Returns the array class for the n'th dimension 1077 virtual ArrayKlass* array_klass(int n, TRAPS); 1078 virtual ArrayKlass* array_klass_or_null(int n); 1079 1080 // Returns the array class with this class as element type 1081 virtual ArrayKlass* array_klass(TRAPS); 1082 virtual ArrayKlass* array_klass_or_null(); 1083 1084 static void clean_initialization_error_table(); 1085 private: 1086 void fence_and_clear_init_lock(); 1087 1088 bool link_class_impl (TRAPS); 1089 bool verify_code (TRAPS); 1090 void initialize_impl (TRAPS); 1091 void initialize_super_interfaces(TRAPS); 1092 1093 void add_initialization_error(JavaThread* current, Handle exception); 1094 oop get_initialization_error(JavaThread* current); 1095 1096 // find a local method (returns null if not found) 1097 Method* find_method_impl(const Symbol* name, 1098 const Symbol* signature, 1099 OverpassLookupMode overpass_mode, 1100 StaticLookupMode static_mode, 1101 PrivateLookupMode private_mode) const; 1102 1103 static Method* find_method_impl(const Array<Method*>* methods, 1104 const Symbol* name, 1105 const Symbol* signature, 1106 OverpassLookupMode overpass_mode, 1107 StaticLookupMode static_mode, 1108 PrivateLookupMode private_mode); 1109 1110 #if INCLUDE_JVMTI 1111 // RedefineClasses support 1112 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1113 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1114 #endif 1115 // log class name to classlist 1116 void log_to_classlist() const; 1117 public: 1118 1119 #if INCLUDE_CDS 1120 // CDS support - remove and restore oops from metadata. Oops are not shared. 1121 virtual void remove_unshareable_info(); 1122 void remove_unshareable_flags(); 1123 virtual void remove_java_mirror(); 1124 void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, PackageEntry* pkg_entry, TRAPS); 1125 void init_shared_package_entry(); 1126 bool can_be_verified_at_dumptime() const; 1127 void compute_has_loops_flag_for_methods(); 1128 #endif 1129 1130 bool has_init_deps_processed() const { return _misc_flags.has_init_deps_processed(); } 1131 void set_has_init_deps_processed() { 1132 assert(is_initialized(), ""); 1133 assert(!has_init_deps_processed(), "already set"); // one-off action 1134 _misc_flags.set_has_init_deps_processed(true); 1135 } 1136 1137 u2 compute_modifier_flags() const; 1138 1139 public: 1140 // JVMTI support 1141 jint jvmti_class_status() const; 1142 1143 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1144 1145 public: 1146 // Printing 1147 void print_on(outputStream* st) const; 1148 void print_value_on(outputStream* st) const; 1149 1150 void oop_print_value_on(oop obj, outputStream* st); 1151 1152 void oop_print_on (oop obj, outputStream* st); 1153 1154 #ifndef PRODUCT 1155 void print_dependent_nmethods(bool verbose = false); 1156 bool is_dependent_nmethod(nmethod* nm); 1157 bool verify_itable_index(int index); 1158 #endif 1159 1160 const char* internal_name() const; 1161 1162 // Verification 1163 void verify_on(outputStream* st); 1164 1165 void oop_verify_on(oop obj, outputStream* st); 1166 1167 // Logging 1168 void print_class_load_logging(ClassLoaderData* loader_data, 1169 const ModuleEntry* module_entry, 1170 const ClassFileStream* cfs) const; 1171 private: 1172 void print_class_load_cause_logging() const; 1173 void print_class_load_helper(ClassLoaderData* loader_data, 1174 const ModuleEntry* module_entry, 1175 const ClassFileStream* cfs) const; 1176 }; 1177 1178 // for adding methods 1179 // UNSET_IDNUM return means no more ids available 1180 inline u2 InstanceKlass::next_method_idnum() { 1181 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1182 return ConstMethod::UNSET_IDNUM; // no more ids available 1183 } else { 1184 return _idnum_allocated_count++; 1185 } 1186 } 1187 1188 class PrintClassClosure : public KlassClosure { 1189 private: 1190 outputStream* _st; 1191 bool _verbose; 1192 public: 1193 PrintClassClosure(outputStream* st, bool verbose); 1194 1195 void do_klass(Klass* k); 1196 }; 1197 1198 /* JNIid class for jfieldIDs only */ 1199 class JNIid: public CHeapObj<mtClass> { 1200 friend class VMStructs; 1201 private: 1202 Klass* _holder; 1203 JNIid* _next; 1204 int _offset; 1205 #ifdef ASSERT 1206 bool _is_static_field_id; 1207 #endif 1208 1209 public: 1210 // Accessors 1211 Klass* holder() const { return _holder; } 1212 int offset() const { return _offset; } 1213 JNIid* next() { return _next; } 1214 // Constructor 1215 JNIid(Klass* holder, int offset, JNIid* next); 1216 // Identifier lookup 1217 JNIid* find(int offset); 1218 1219 bool find_local_field(fieldDescriptor* fd) { 1220 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1221 } 1222 1223 static void deallocate(JNIid* id); 1224 // Debugging 1225 #ifdef ASSERT 1226 bool is_static_field_id() const { return _is_static_field_id; } 1227 void set_is_static_field_id() { _is_static_field_id = true; } 1228 #endif 1229 void verify(Klass* holder); 1230 }; 1231 1232 // An iterator that's used to access the inner classes indices in the 1233 // InstanceKlass::_inner_classes array. 1234 class InnerClassesIterator : public StackObj { 1235 private: 1236 Array<jushort>* _inner_classes; 1237 int _length; 1238 int _idx; 1239 public: 1240 1241 InnerClassesIterator(const InstanceKlass* k) { 1242 _inner_classes = k->inner_classes(); 1243 if (k->inner_classes() != nullptr) { 1244 _length = _inner_classes->length(); 1245 // The inner class array's length should be the multiple of 1246 // inner_class_next_offset if it only contains the InnerClasses 1247 // attribute data, or it should be 1248 // n*inner_class_next_offset+enclosing_method_attribute_size 1249 // if it also contains the EnclosingMethod data. 1250 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1251 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1252 "just checking"); 1253 // Remove the enclosing_method portion if exists. 1254 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1255 _length -= InstanceKlass::enclosing_method_attribute_size; 1256 } 1257 } else { 1258 _length = 0; 1259 } 1260 _idx = 0; 1261 } 1262 1263 int length() const { 1264 return _length; 1265 } 1266 1267 void next() { 1268 _idx += InstanceKlass::inner_class_next_offset; 1269 } 1270 1271 bool done() const { 1272 return (_idx >= _length); 1273 } 1274 1275 u2 inner_class_info_index() const { 1276 return _inner_classes->at( 1277 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1278 } 1279 1280 void set_inner_class_info_index(u2 index) { 1281 _inner_classes->at_put( 1282 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1283 } 1284 1285 u2 outer_class_info_index() const { 1286 return _inner_classes->at( 1287 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1288 } 1289 1290 void set_outer_class_info_index(u2 index) { 1291 _inner_classes->at_put( 1292 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1293 } 1294 1295 u2 inner_name_index() const { 1296 return _inner_classes->at( 1297 _idx + InstanceKlass::inner_class_inner_name_offset); 1298 } 1299 1300 void set_inner_name_index(u2 index) { 1301 _inner_classes->at_put( 1302 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1303 } 1304 1305 u2 inner_access_flags() const { 1306 return _inner_classes->at( 1307 _idx + InstanceKlass::inner_class_access_flags_offset); 1308 } 1309 }; 1310 1311 // Iterator over class hierarchy under a particular class. Implements depth-first pre-order traversal. 1312 // Usage: 1313 // for (ClassHierarchyIterator iter(root_klass); !iter.done(); iter.next()) { 1314 // Klass* k = iter.klass(); 1315 // ... 1316 // } 1317 class ClassHierarchyIterator : public StackObj { 1318 private: 1319 InstanceKlass* _root; 1320 Klass* _current; 1321 bool _visit_subclasses; 1322 1323 public: 1324 ClassHierarchyIterator(InstanceKlass* root) : _root(root), _current(root), _visit_subclasses(true) { 1325 assert(_root == _current, "required"); // initial state 1326 } 1327 1328 bool done() { 1329 return (_current == nullptr); 1330 } 1331 1332 // Make a step iterating over the class hierarchy under the root class. 1333 // Skips subclasses if requested. 1334 void next(); 1335 1336 Klass* klass() { 1337 assert(!done(), "sanity"); 1338 return _current; 1339 } 1340 1341 // Skip subclasses of the current class. 1342 void skip_subclasses() { 1343 _visit_subclasses = false; 1344 } 1345 }; 1346 1347 #endif // SHARE_OOPS_INSTANCEKLASS_HPP