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 being_linked, // currently running verifier and rewriter 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 volatile ClassState _init_state; // state of class 230 231 u1 _reference_type; // reference type 232 233 // State is set either at parse time or while executing, atomically to not disturb other state 234 InstanceKlassFlags _misc_flags; 235 236 Monitor* _init_monitor; // mutual exclusion to _init_state and _init_thread. 237 JavaThread* volatile _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization) 238 239 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 240 JNIid* _jni_ids; // First JNI identifier for static fields in this class 241 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or null if none 242 nmethodBucket* volatile _dep_context; // packed DependencyContext structure 243 uint64_t volatile _dep_context_last_cleaned; 244 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 245 #if INCLUDE_JVMTI 246 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 247 // Linked instanceKlasses of previous versions 248 InstanceKlass* _previous_versions; 249 // JVMTI fields can be moved to their own structure - see 6315920 250 // JVMTI: cached class file, before retransformable agent modified it in CFLH 251 JvmtiCachedClassFileData* _cached_class_file; 252 #endif 253 254 #if INCLUDE_JVMTI 255 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 256 #endif 257 258 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 259 NOT_PRODUCT(volatile int _shared_class_load_count;) // ensure a shared class is loaded only once 260 261 // Method array. 262 Array<Method*>* _methods; 263 // Default Method Array, concrete methods inherited from interfaces 264 Array<Method*>* _default_methods; 265 // Interfaces (InstanceKlass*s) this class declares locally to implement. 266 Array<InstanceKlass*>* _local_interfaces; 267 // Interfaces (InstanceKlass*s) this class implements transitively. 268 Array<InstanceKlass*>* _transitive_interfaces; 269 // Int array containing the original order of method in the class file (for JVMTI). 270 Array<int>* _method_ordering; 271 // Int array containing the vtable_indices for default_methods 272 // offset matches _default_methods offset 273 Array<int>* _default_vtable_indices; 274 275 // Fields information is stored in an UNSIGNED5 encoded stream (see fieldInfo.hpp) 276 Array<u1>* _fieldinfo_stream; 277 Array<FieldStatus>* _fields_status; 278 279 // embedded Java vtable follows here 280 // embedded Java itables follows here 281 // embedded static fields follows here 282 // embedded nonstatic oop-map blocks follows here 283 // embedded implementor of this interface follows here 284 // The embedded implementor only exists if the current klass is an 285 // interface. The possible values of the implementor fall into following 286 // three cases: 287 // null: no implementor. 288 // A Klass* that's not itself: one implementor. 289 // Itself: more than one implementors. 290 // 291 292 friend class SystemDictionary; 293 294 static bool _disable_method_binary_search; 295 296 // Controls finalizer registration 297 static bool _finalization_enabled; 298 299 public: 300 301 // Queries finalization state 302 static bool is_finalization_enabled() { return _finalization_enabled; } 303 304 // Sets finalization state 305 static void set_finalization_enabled(bool val) { _finalization_enabled = val; } 306 307 // The three BUILTIN class loader types 308 bool is_shared_boot_class() const { return _misc_flags.is_shared_boot_class(); } 309 bool is_shared_platform_class() const { return _misc_flags.is_shared_platform_class(); } 310 bool is_shared_app_class() const { return _misc_flags.is_shared_app_class(); } 311 // The UNREGISTERED class loader type 312 bool is_shared_unregistered_class() const { return _misc_flags.is_shared_unregistered_class(); } 313 314 // Check if the class can be shared in CDS 315 bool is_shareable() const; 316 317 bool shared_loading_failed() const { return _misc_flags.shared_loading_failed(); } 318 319 void set_shared_loading_failed() { _misc_flags.set_shared_loading_failed(true); } 320 321 #if INCLUDE_CDS 322 int shared_class_loader_type() const; 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 // We can safely access the name as long as we hold the _init_monitor. 502 const char* init_thread_name() { 503 assert(_init_monitor->owned_by_self(), "Must hold _init_monitor here"); 504 return init_thread()->name_raw(); 505 } 506 507 public: 508 // initialization state 509 bool is_loaded() const { return init_state() >= loaded; } 510 bool is_linked() const { return init_state() >= linked; } 511 bool is_being_linked() const { return init_state() == being_linked; } 512 bool is_initialized() const { return init_state() == fully_initialized; } 513 bool is_not_initialized() const { return init_state() < being_initialized; } 514 bool is_being_initialized() const { return init_state() == being_initialized; } 515 bool is_in_error_state() const { return init_state() == initialization_error; } 516 bool is_init_thread(JavaThread *thread) { return thread == init_thread(); } 517 ClassState init_state() const { return Atomic::load(&_init_state); } 518 const char* init_state_name() const; 519 bool is_rewritten() const { return _misc_flags.rewritten(); } 520 521 static const char* state2name(ClassState state); 522 523 class LockLinkState : public StackObj { 524 InstanceKlass* _ik; 525 JavaThread* _current; 526 public: 527 LockLinkState(InstanceKlass* ik, JavaThread* current) : _ik(ik), _current(current) { 528 ik->check_link_state_and_wait(current); 529 } 530 ~LockLinkState() { 531 if (!_ik->is_linked()) { 532 // Reset to loaded if linking failed. 533 _ik->set_initialization_state_and_notify(loaded, _current); 534 } 535 } 536 }; 537 538 // is this a sealed class 539 bool is_sealed() const; 540 541 // defineClass specified verification 542 bool should_verify_class() const { return _misc_flags.should_verify_class(); } 543 void set_should_verify_class(bool value) { _misc_flags.set_should_verify_class(value); } 544 545 // marking 546 bool is_marked_dependent() const { return _misc_flags.is_marked_dependent(); } 547 void set_is_marked_dependent(bool value) { _misc_flags.set_is_marked_dependent(value); } 548 549 // initialization (virtuals from Klass) 550 bool should_be_initialized() const; // means that initialize should be called 551 void initialize_from_cds(TRAPS); 552 void initialize(TRAPS); 553 void link_class(TRAPS); 554 bool link_class_or_fail(TRAPS); // returns false on failure 555 void rewrite_class(TRAPS); 556 void link_methods(TRAPS); 557 Method* class_initializer() const; 558 559 // reference type 560 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 561 562 // this class cp index 563 u2 this_class_index() const { return _this_class_index; } 564 void set_this_class_index(u2 index) { _this_class_index = index; } 565 566 static ByteSize reference_type_offset() { return byte_offset_of(InstanceKlass, _reference_type); } 567 568 // find local field, returns true if found 569 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 570 // find field in direct superinterfaces, returns the interface in which the field is defined 571 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 572 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 573 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 574 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 575 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 576 577 // find a non-static or static field given its offset within the class. 578 bool contains_field_offset(int offset); 579 580 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 581 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 582 583 private: 584 inline static int quick_search(const Array<Method*>* methods, const Symbol* name); 585 586 public: 587 static void disable_method_binary_search() { 588 _disable_method_binary_search = true; 589 } 590 591 // find a local method (returns null if not found) 592 Method* find_method(const Symbol* name, const Symbol* signature) const; 593 static Method* find_method(const Array<Method*>* methods, 594 const Symbol* name, 595 const Symbol* signature); 596 597 // find a local method, but skip static methods 598 Method* find_instance_method(const Symbol* name, const Symbol* signature, 599 PrivateLookupMode private_mode) const; 600 static Method* find_instance_method(const Array<Method*>* methods, 601 const Symbol* name, 602 const Symbol* signature, 603 PrivateLookupMode private_mode); 604 605 // find a local method (returns null if not found) 606 Method* find_local_method(const Symbol* name, 607 const Symbol* signature, 608 OverpassLookupMode overpass_mode, 609 StaticLookupMode static_mode, 610 PrivateLookupMode private_mode) const; 611 612 // find a local method from given methods array (returns null if not found) 613 static Method* find_local_method(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 // find a local method index in methods or default_methods (returns -1 if not found) 621 static int find_method_index(const Array<Method*>* methods, 622 const Symbol* name, 623 const Symbol* signature, 624 OverpassLookupMode overpass_mode, 625 StaticLookupMode static_mode, 626 PrivateLookupMode private_mode); 627 628 // lookup operation (returns null if not found) 629 Method* uncached_lookup_method(const Symbol* name, 630 const Symbol* signature, 631 OverpassLookupMode overpass_mode, 632 PrivateLookupMode private_mode = PrivateLookupMode::find) const; 633 634 // lookup a method in all the interfaces that this class implements 635 // (returns null if not found) 636 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 637 638 // lookup a method in local defaults then in all interfaces 639 // (returns null if not found) 640 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 641 642 // Find method indices by name. If a method with the specified name is 643 // found the index to the first method is returned, and 'end' is filled in 644 // with the index of first non-name-matching method. If no method is found 645 // -1 is returned. 646 int find_method_by_name(const Symbol* name, int* end) const; 647 static int find_method_by_name(const Array<Method*>* methods, 648 const Symbol* name, int* end); 649 650 // constant pool 651 ConstantPool* constants() const { return _constants; } 652 void set_constants(ConstantPool* c) { _constants = c; } 653 654 // protection domain 655 oop protection_domain() const; 656 657 // signers 658 objArrayOop signers() const; 659 660 bool is_contended() const { return _misc_flags.is_contended(); } 661 void set_is_contended(bool value) { _misc_flags.set_is_contended(value); } 662 663 // source file name 664 Symbol* source_file_name() const; 665 u2 source_file_name_index() const; 666 void set_source_file_name_index(u2 sourcefile_index); 667 668 // minor and major version numbers of class file 669 u2 minor_version() const; 670 void set_minor_version(u2 minor_version); 671 u2 major_version() const; 672 void set_major_version(u2 major_version); 673 674 // source debug extension 675 const char* source_debug_extension() const { return _source_debug_extension; } 676 void set_source_debug_extension(const char* array, int length); 677 678 // nonstatic oop-map blocks 679 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 680 return oop_map_count * OopMapBlock::size_in_words(); 681 } 682 unsigned int nonstatic_oop_map_count() const { 683 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 684 } 685 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 686 void set_nonstatic_oop_map_size(int words) { 687 _nonstatic_oop_map_size = words; 688 } 689 690 bool has_contended_annotations() const { return _misc_flags.has_contended_annotations(); } 691 void set_has_contended_annotations(bool value) { _misc_flags.set_has_contended_annotations(value); } 692 693 #if INCLUDE_JVMTI 694 // Redefinition locking. Class can only be redefined by one thread at a time. 695 // The flag is in access_flags so that it can be set and reset using atomic 696 // operations, and not be reset by other misc_flag settings. 697 bool is_being_redefined() const { return _misc_flags.is_being_redefined(); } 698 void set_is_being_redefined(bool value) { _misc_flags.set_is_being_redefined(value); } 699 700 // RedefineClasses() support for previous versions: 701 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 702 void purge_previous_version_list(); 703 704 InstanceKlass* previous_versions() const { return _previous_versions; } 705 #else 706 InstanceKlass* previous_versions() const { return nullptr; } 707 #endif 708 709 InstanceKlass* get_klass_version(int version); 710 711 bool has_been_redefined() const { return _misc_flags.has_been_redefined(); } 712 void set_has_been_redefined() { _misc_flags.set_has_been_redefined(true); } 713 714 bool is_scratch_class() const { return _misc_flags.is_scratch_class(); } 715 void set_is_scratch_class() { _misc_flags.set_is_scratch_class(true); } 716 717 bool has_resolved_methods() const { return _misc_flags.has_resolved_methods(); } 718 void set_has_resolved_methods() { _misc_flags.set_has_resolved_methods(true); } 719 void set_has_resolved_methods(bool value) { _misc_flags.set_has_resolved_methods(value); } 720 721 public: 722 #if INCLUDE_JVMTI 723 724 void init_previous_versions() { 725 _previous_versions = nullptr; 726 } 727 728 private: 729 static bool _should_clean_previous_versions; 730 public: 731 static void purge_previous_versions(InstanceKlass* ik) { 732 if (ik->has_been_redefined()) { 733 ik->purge_previous_version_list(); 734 } 735 } 736 737 static bool should_clean_previous_versions_and_reset(); 738 static bool should_clean_previous_versions() { return _should_clean_previous_versions; } 739 740 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 741 void set_cached_class_file(JvmtiCachedClassFileData *data) { 742 _cached_class_file = data; 743 } 744 JvmtiCachedClassFileData * get_cached_class_file(); 745 jint get_cached_class_file_len(); 746 unsigned char * get_cached_class_file_bytes(); 747 748 // JVMTI: Support for caching of field indices, types, and offsets 749 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 750 _jvmti_cached_class_field_map = descriptor; 751 } 752 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 753 return _jvmti_cached_class_field_map; 754 } 755 #else // INCLUDE_JVMTI 756 757 static void purge_previous_versions(InstanceKlass* ik) { return; }; 758 static bool should_clean_previous_versions_and_reset() { return false; } 759 760 void set_cached_class_file(JvmtiCachedClassFileData *data) { 761 assert(data == nullptr, "unexpected call with JVMTI disabled"); 762 } 763 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)nullptr; } 764 765 #endif // INCLUDE_JVMTI 766 767 bool has_nonstatic_concrete_methods() const { return _misc_flags.has_nonstatic_concrete_methods(); } 768 void set_has_nonstatic_concrete_methods(bool b) { _misc_flags.set_has_nonstatic_concrete_methods(b); } 769 770 bool declares_nonstatic_concrete_methods() const { return _misc_flags.declares_nonstatic_concrete_methods(); } 771 void set_declares_nonstatic_concrete_methods(bool b) { _misc_flags.set_declares_nonstatic_concrete_methods(b); } 772 773 bool has_vanilla_constructor() const { return _misc_flags.has_vanilla_constructor(); } 774 void set_has_vanilla_constructor() { _misc_flags.set_has_vanilla_constructor(true); } 775 bool has_miranda_methods () const { return _misc_flags.has_miranda_methods(); } 776 void set_has_miranda_methods() { _misc_flags.set_has_miranda_methods(true); } 777 bool has_final_method() const { return _misc_flags.has_final_method(); } 778 void set_has_final_method() { _misc_flags.set_has_final_method(true); } 779 780 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 781 inline u2 next_method_idnum(); 782 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 783 784 // generics support 785 Symbol* generic_signature() const; 786 u2 generic_signature_index() const; 787 void set_generic_signature_index(u2 sig_index); 788 789 u2 enclosing_method_data(int offset) const; 790 u2 enclosing_method_class_index() const { 791 return enclosing_method_data(enclosing_method_class_index_offset); 792 } 793 u2 enclosing_method_method_index() { 794 return enclosing_method_data(enclosing_method_method_index_offset); 795 } 796 void set_enclosing_method_indices(u2 class_index, 797 u2 method_index); 798 799 // jmethodID support 800 jmethodID get_jmethod_id(const methodHandle& method_h); 801 void ensure_space_for_methodids(int start_offset = 0); 802 jmethodID jmethod_id_or_null(Method* method); 803 void update_methods_jmethod_cache(); 804 805 // annotations support 806 Annotations* annotations() const { return _annotations; } 807 void set_annotations(Annotations* anno) { _annotations = anno; } 808 809 AnnotationArray* class_annotations() const { 810 return (_annotations != nullptr) ? _annotations->class_annotations() : nullptr; 811 } 812 Array<AnnotationArray*>* fields_annotations() const { 813 return (_annotations != nullptr) ? _annotations->fields_annotations() : nullptr; 814 } 815 AnnotationArray* class_type_annotations() const { 816 return (_annotations != nullptr) ? _annotations->class_type_annotations() : nullptr; 817 } 818 Array<AnnotationArray*>* fields_type_annotations() const { 819 return (_annotations != nullptr) ? _annotations->fields_type_annotations() : nullptr; 820 } 821 // allocation 822 instanceOop allocate_instance(TRAPS); 823 static instanceOop allocate_instance(oop cls, const char* who, TRAPS); 824 825 // additional member function to return a handle 826 instanceHandle allocate_instance_handle(TRAPS); 827 828 objArrayOop allocate_objArray(int n, int length, TRAPS); 829 // Helper function 830 static instanceOop register_finalizer(instanceOop i, TRAPS); 831 832 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 833 // if not, throw either an Error or an Exception. 834 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 835 836 // initialization 837 void call_class_initializer(TRAPS); 838 void set_initialization_state_and_notify(ClassState state, JavaThread* current); 839 840 // OopMapCache support 841 OopMapCache* oop_map_cache() { return _oop_map_cache; } 842 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 843 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 844 845 // JNI identifier support (for static fields - for jni performance) 846 JNIid* jni_ids() { return _jni_ids; } 847 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 848 JNIid* jni_id_for(int offset); 849 850 // maintenance of deoptimization dependencies 851 inline DependencyContext dependencies(); 852 void mark_dependent_nmethods(DeoptimizationScope* deopt_scope, KlassDepChange& changes); 853 void add_dependent_nmethod(nmethod* nm); 854 void clean_dependency_context(); 855 // Setup link to hierarchy and deoptimize 856 void add_to_hierarchy(JavaThread* current); 857 858 // On-stack replacement support 859 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 860 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 861 void add_osr_nmethod(nmethod* n); 862 bool remove_osr_nmethod(nmethod* n); 863 int mark_osr_nmethods(DeoptimizationScope* deopt_scope, const Method* m); 864 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 865 866 #if INCLUDE_JVMTI 867 // Breakpoint support (see methods on Method* for details) 868 BreakpointInfo* breakpoints() const { return _breakpoints; }; 869 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 870 #endif 871 872 // support for stub routines 873 static ByteSize init_state_offset() { return byte_offset_of(InstanceKlass, _init_state); } 874 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;) 875 static ByteSize init_thread_offset() { return byte_offset_of(InstanceKlass, _init_thread); } 876 877 // subclass/subinterface checks 878 bool implements_interface(Klass* k) const; 879 bool is_same_or_direct_interface(Klass* k) const; 880 881 #ifdef ASSERT 882 // check whether this class or one of its superclasses was redefined 883 bool has_redefined_this_or_super() const; 884 #endif 885 886 // Access to the implementor of an interface. 887 InstanceKlass* implementor() const; 888 void set_implementor(InstanceKlass* ik); 889 int nof_implementors() const; 890 void add_implementor(InstanceKlass* ik); // ik is a new class that implements this interface 891 void init_implementor(); // initialize 892 893 private: 894 // link this class into the implementors list of every interface it implements 895 void process_interfaces(); 896 897 public: 898 // virtual operations from Klass 899 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 900 Array<InstanceKlass*>* transitive_interfaces); 901 bool can_be_primary_super_slow() const; 902 size_t oop_size(oop obj) const { return size_helper(); } 903 // slow because it's a virtual call and used for verifying the layout_helper. 904 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 905 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 906 907 // Iterators 908 void do_local_static_fields(FieldClosure* cl); 909 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 910 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 911 void print_nonstatic_fields(FieldClosure* cl); // including inherited and injected fields 912 913 void methods_do(void f(Method* method)); 914 915 static InstanceKlass* cast(Klass* k) { 916 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 917 } 918 919 static const InstanceKlass* cast(const Klass* k) { 920 assert(k != nullptr, "k should not be null"); 921 assert(k->is_instance_klass(), "cast to InstanceKlass"); 922 return static_cast<const InstanceKlass*>(k); 923 } 924 925 virtual InstanceKlass* java_super() const { 926 return (super() == nullptr) ? nullptr : cast(super()); 927 } 928 929 // Sizing (in words) 930 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 931 932 static int size(int vtable_length, int itable_length, 933 int nonstatic_oop_map_size, 934 bool is_interface) { 935 return align_metadata_size(header_size() + 936 vtable_length + 937 itable_length + 938 nonstatic_oop_map_size + 939 (is_interface ? (int)sizeof(Klass*)/wordSize : 0)); 940 } 941 942 int size() const { return size(vtable_length(), 943 itable_length(), 944 nonstatic_oop_map_size(), 945 is_interface()); 946 } 947 948 949 inline intptr_t* start_of_itable() const; 950 inline intptr_t* end_of_itable() const; 951 inline oop static_field_base_raw(); 952 953 inline OopMapBlock* start_of_nonstatic_oop_maps() const; 954 inline Klass** end_of_nonstatic_oop_maps() const; 955 956 inline InstanceKlass* volatile* adr_implementor() const; 957 958 // Use this to return the size of an instance in heap words: 959 int size_helper() const { 960 return layout_helper_to_size_helper(layout_helper()); 961 } 962 963 // This bit is initialized in classFileParser.cpp. 964 // It is false under any of the following conditions: 965 // - the class is abstract (including any interface) 966 // - the class size is larger than FastAllocateSizeLimit 967 // - the class is java/lang/Class, which cannot be allocated directly 968 bool can_be_fastpath_allocated() const { 969 return !layout_helper_needs_slow_path(layout_helper()); 970 } 971 972 // Java itable 973 klassItable itable() const; // return klassItable wrapper 974 Method* method_at_itable(InstanceKlass* holder, int index, TRAPS); 975 Method* method_at_itable_or_null(InstanceKlass* holder, int index, bool& itable_entry_found); 976 int vtable_index_of_interface_method(Method* method); 977 978 #if INCLUDE_JVMTI 979 void adjust_default_methods(bool* trace_name_printed); 980 #endif // INCLUDE_JVMTI 981 982 void clean_weak_instanceklass_links(); 983 private: 984 void clean_implementors_list(); 985 void clean_method_data(); 986 987 public: 988 // Explicit metaspace deallocation of fields 989 // For RedefineClasses and class file parsing errors, we need to deallocate 990 // instanceKlasses and the metadata they point to. 991 void deallocate_contents(ClassLoaderData* loader_data); 992 static void deallocate_methods(ClassLoaderData* loader_data, 993 Array<Method*>* methods); 994 void static deallocate_interfaces(ClassLoaderData* loader_data, 995 const Klass* super_klass, 996 Array<InstanceKlass*>* local_interfaces, 997 Array<InstanceKlass*>* transitive_interfaces); 998 void static deallocate_record_components(ClassLoaderData* loader_data, 999 Array<RecordComponent*>* record_component); 1000 1001 virtual bool on_stack() const; 1002 1003 // callbacks for actions during class unloading 1004 static void unload_class(InstanceKlass* ik); 1005 1006 virtual void release_C_heap_structures(bool release_sub_metadata = true); 1007 1008 // Naming 1009 const char* signature_name() const; 1010 1011 // Oop fields (and metadata) iterators 1012 // 1013 // The InstanceKlass iterators also visits the Object's klass. 1014 1015 // Forward iteration 1016 public: 1017 // Iterate over all oop fields in the oop maps. 1018 template <typename T, class OopClosureType> 1019 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1020 1021 // Iterate over all oop fields and metadata. 1022 template <typename T, class OopClosureType> 1023 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 1024 1025 // Iterate over all oop fields in one oop map. 1026 template <typename T, class OopClosureType> 1027 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1028 1029 1030 // Reverse iteration 1031 // Iterate over all oop fields and metadata. 1032 template <typename T, class OopClosureType> 1033 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1034 1035 private: 1036 // Iterate over all oop fields in the oop maps. 1037 template <typename T, class OopClosureType> 1038 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1039 1040 // Iterate over all oop fields in one oop map. 1041 template <typename T, class OopClosureType> 1042 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1043 1044 1045 // Bounded range iteration 1046 public: 1047 // Iterate over all oop fields in the oop maps. 1048 template <typename T, class OopClosureType> 1049 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1050 1051 // Iterate over all oop fields and metadata. 1052 template <typename T, class OopClosureType> 1053 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1054 1055 private: 1056 // Iterate over all oop fields in one oop map. 1057 template <typename T, class OopClosureType> 1058 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1059 1060 1061 public: 1062 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1063 1064 private: 1065 // initialization state 1066 void set_init_state(ClassState state); 1067 void set_rewritten() { _misc_flags.set_rewritten(true); } 1068 void set_init_thread(JavaThread *thread) { 1069 assert((thread == JavaThread::current() && _init_thread == nullptr) || 1070 (thread == nullptr && _init_thread == JavaThread::current()), "Only one thread is allowed to own initialization"); 1071 Atomic::store(&_init_thread, thread); 1072 } 1073 1074 inline jmethodID* methods_jmethod_ids_acquire() const; 1075 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1076 // This nulls out jmethodIDs for all methods in 'klass' 1077 static void clear_jmethod_ids(InstanceKlass* klass); 1078 jmethodID update_jmethod_id(jmethodID* jmeths, Method* method, int idnum); 1079 1080 public: 1081 // Returns the array class for the n'th dimension 1082 virtual ArrayKlass* array_klass(int n, TRAPS); 1083 virtual ArrayKlass* array_klass_or_null(int n); 1084 1085 // Returns the array class with this class as element type 1086 virtual ArrayKlass* array_klass(TRAPS); 1087 virtual ArrayKlass* array_klass_or_null(); 1088 1089 static void clean_initialization_error_table(); 1090 1091 Monitor* init_monitor() const { return _init_monitor; } 1092 private: 1093 void check_link_state_and_wait(JavaThread* current); 1094 bool link_class_impl (TRAPS); 1095 bool verify_code (TRAPS); 1096 void initialize_impl (TRAPS); 1097 void initialize_super_interfaces(TRAPS); 1098 1099 void add_initialization_error(JavaThread* current, Handle exception); 1100 oop get_initialization_error(JavaThread* current); 1101 1102 // find a local method (returns null if not found) 1103 Method* find_method_impl(const Symbol* name, 1104 const Symbol* signature, 1105 OverpassLookupMode overpass_mode, 1106 StaticLookupMode static_mode, 1107 PrivateLookupMode private_mode) const; 1108 1109 static Method* find_method_impl(const Array<Method*>* methods, 1110 const Symbol* name, 1111 const Symbol* signature, 1112 OverpassLookupMode overpass_mode, 1113 StaticLookupMode static_mode, 1114 PrivateLookupMode private_mode); 1115 1116 #if INCLUDE_JVMTI 1117 // RedefineClasses support 1118 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1119 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1120 #endif 1121 // log class name to classlist 1122 void log_to_classlist() const; 1123 public: 1124 1125 #if INCLUDE_CDS 1126 // CDS support - remove and restore oops from metadata. Oops are not shared. 1127 virtual void remove_unshareable_info(); 1128 void remove_unshareable_flags(); 1129 virtual void remove_java_mirror(); 1130 void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, PackageEntry* pkg_entry, TRAPS); 1131 void init_shared_package_entry(); 1132 bool can_be_verified_at_dumptime() const; 1133 bool methods_contain_jsr_bytecode() const; 1134 void compute_has_loops_flag_for_methods(); 1135 #endif 1136 1137 bool has_init_deps_processed() const { return _misc_flags.has_init_deps_processed(); } 1138 void set_has_init_deps_processed() { 1139 assert(is_initialized(), ""); 1140 assert(!has_init_deps_processed(), "already set"); // one-off action 1141 _misc_flags.set_has_init_deps_processed(true); 1142 } 1143 1144 jint compute_modifier_flags() const; 1145 1146 public: 1147 // JVMTI support 1148 jint jvmti_class_status() const; 1149 1150 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1151 1152 public: 1153 // Printing 1154 void print_on(outputStream* st) const; 1155 void print_value_on(outputStream* st) const; 1156 1157 void oop_print_value_on(oop obj, outputStream* st); 1158 1159 void oop_print_on (oop obj, outputStream* st); 1160 1161 #ifndef PRODUCT 1162 void print_dependent_nmethods(bool verbose = false); 1163 bool is_dependent_nmethod(nmethod* nm); 1164 bool verify_itable_index(int index); 1165 #endif 1166 1167 const char* internal_name() const; 1168 1169 // Verification 1170 void verify_on(outputStream* st); 1171 1172 void oop_verify_on(oop obj, outputStream* st); 1173 1174 // Logging 1175 void print_class_load_logging(ClassLoaderData* loader_data, 1176 const ModuleEntry* module_entry, 1177 const ClassFileStream* cfs) const; 1178 private: 1179 void print_class_load_cause_logging() const; 1180 void print_class_load_helper(ClassLoaderData* loader_data, 1181 const ModuleEntry* module_entry, 1182 const ClassFileStream* cfs) const; 1183 }; 1184 1185 // for adding methods 1186 // UNSET_IDNUM return means no more ids available 1187 inline u2 InstanceKlass::next_method_idnum() { 1188 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1189 return ConstMethod::UNSET_IDNUM; // no more ids available 1190 } else { 1191 return _idnum_allocated_count++; 1192 } 1193 } 1194 1195 class PrintClassClosure : public KlassClosure { 1196 private: 1197 outputStream* _st; 1198 bool _verbose; 1199 public: 1200 PrintClassClosure(outputStream* st, bool verbose); 1201 1202 void do_klass(Klass* k); 1203 }; 1204 1205 /* JNIid class for jfieldIDs only */ 1206 class JNIid: public CHeapObj<mtClass> { 1207 friend class VMStructs; 1208 private: 1209 Klass* _holder; 1210 JNIid* _next; 1211 int _offset; 1212 #ifdef ASSERT 1213 bool _is_static_field_id; 1214 #endif 1215 1216 public: 1217 // Accessors 1218 Klass* holder() const { return _holder; } 1219 int offset() const { return _offset; } 1220 JNIid* next() { return _next; } 1221 // Constructor 1222 JNIid(Klass* holder, int offset, JNIid* next); 1223 // Identifier lookup 1224 JNIid* find(int offset); 1225 1226 bool find_local_field(fieldDescriptor* fd) { 1227 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1228 } 1229 1230 static void deallocate(JNIid* id); 1231 // Debugging 1232 #ifdef ASSERT 1233 bool is_static_field_id() const { return _is_static_field_id; } 1234 void set_is_static_field_id() { _is_static_field_id = true; } 1235 #endif 1236 void verify(Klass* holder); 1237 }; 1238 1239 // An iterator that's used to access the inner classes indices in the 1240 // InstanceKlass::_inner_classes array. 1241 class InnerClassesIterator : public StackObj { 1242 private: 1243 Array<jushort>* _inner_classes; 1244 int _length; 1245 int _idx; 1246 public: 1247 1248 InnerClassesIterator(const InstanceKlass* k) { 1249 _inner_classes = k->inner_classes(); 1250 if (k->inner_classes() != nullptr) { 1251 _length = _inner_classes->length(); 1252 // The inner class array's length should be the multiple of 1253 // inner_class_next_offset if it only contains the InnerClasses 1254 // attribute data, or it should be 1255 // n*inner_class_next_offset+enclosing_method_attribute_size 1256 // if it also contains the EnclosingMethod data. 1257 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1258 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1259 "just checking"); 1260 // Remove the enclosing_method portion if exists. 1261 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1262 _length -= InstanceKlass::enclosing_method_attribute_size; 1263 } 1264 } else { 1265 _length = 0; 1266 } 1267 _idx = 0; 1268 } 1269 1270 int length() const { 1271 return _length; 1272 } 1273 1274 void next() { 1275 _idx += InstanceKlass::inner_class_next_offset; 1276 } 1277 1278 bool done() const { 1279 return (_idx >= _length); 1280 } 1281 1282 u2 inner_class_info_index() const { 1283 return _inner_classes->at( 1284 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1285 } 1286 1287 void set_inner_class_info_index(u2 index) { 1288 _inner_classes->at_put( 1289 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1290 } 1291 1292 u2 outer_class_info_index() const { 1293 return _inner_classes->at( 1294 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1295 } 1296 1297 void set_outer_class_info_index(u2 index) { 1298 _inner_classes->at_put( 1299 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1300 } 1301 1302 u2 inner_name_index() const { 1303 return _inner_classes->at( 1304 _idx + InstanceKlass::inner_class_inner_name_offset); 1305 } 1306 1307 void set_inner_name_index(u2 index) { 1308 _inner_classes->at_put( 1309 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1310 } 1311 1312 u2 inner_access_flags() const { 1313 return _inner_classes->at( 1314 _idx + InstanceKlass::inner_class_access_flags_offset); 1315 } 1316 }; 1317 1318 // Iterator over class hierarchy under a particular class. Implements depth-first pre-order traversal. 1319 // Usage: 1320 // for (ClassHierarchyIterator iter(root_klass); !iter.done(); iter.next()) { 1321 // Klass* k = iter.klass(); 1322 // ... 1323 // } 1324 class ClassHierarchyIterator : public StackObj { 1325 private: 1326 InstanceKlass* _root; 1327 Klass* _current; 1328 bool _visit_subclasses; 1329 1330 public: 1331 ClassHierarchyIterator(InstanceKlass* root) : _root(root), _current(root), _visit_subclasses(true) { 1332 assert(_root == _current, "required"); // initial state 1333 } 1334 1335 bool done() { 1336 return (_current == nullptr); 1337 } 1338 1339 // Make a step iterating over the class hierarchy under the root class. 1340 // Skips subclasses if requested. 1341 void next(); 1342 1343 Klass* klass() { 1344 assert(!done(), "sanity"); 1345 return _current; 1346 } 1347 1348 // Skip subclasses of the current class. 1349 void skip_subclasses() { 1350 _visit_subclasses = false; 1351 } 1352 }; 1353 1354 #endif // SHARE_OOPS_INSTANCEKLASS_HPP