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 "code/vmreg.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 Monitor; 49 class RecordComponent; 50 51 // An InstanceKlass is the VM level representation of a Java class. 52 // It contains all information needed for at class at execution runtime. 53 54 // InstanceKlass embedded field layout (after declared fields): 55 // [EMBEDDED Java vtable ] size in words = vtable_len 56 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size 57 // The embedded nonstatic oop-map blocks are short pairs (offset, length) 58 // indicating where oops are located in instances of this klass. 59 // [EMBEDDED implementor of the interface] only exist for interface 60 // [EMBEDDED InlineKlassFixedBlock] only if is an InlineKlass instance 61 62 63 // forward declaration for class -- see below for definition 64 #if INCLUDE_JVMTI 65 class BreakpointInfo; 66 #endif 67 class ClassFileParser; 68 class ClassFileStream; 69 class KlassDepChange; 70 class DependencyContext; 71 class fieldDescriptor; 72 class jniIdMapBase; 73 class JNIid; 74 class JvmtiCachedClassFieldMap; 75 class nmethodBucket; 76 class OopMapCache; 77 class BufferedInlineTypeBlob; 78 class InterpreterOopMap; 79 class PackageEntry; 80 class ModuleEntry; 81 82 // This is used in iterators below. 83 class FieldClosure: public StackObj { 84 public: 85 virtual void do_field(fieldDescriptor* fd) = 0; 86 }; 87 88 // Print fields. 89 // If "obj" argument to constructor is null, prints static fields, otherwise prints non-static fields. 90 class FieldPrinter: public FieldClosure { 91 oop _obj; 92 outputStream* _st; 93 public: 94 FieldPrinter(outputStream* st, oop obj = nullptr) : _obj(obj), _st(st) {} 95 void do_field(fieldDescriptor* fd); 96 }; 97 98 // Describes where oops are located in instances of this klass. 99 class OopMapBlock { 100 public: 101 // Byte offset of the first oop mapped by this block. 102 int offset() const { return _offset; } 103 void set_offset(int offset) { _offset = offset; } 104 105 // Number of oops in this block. 106 uint count() const { return _count; } 107 void set_count(uint count) { _count = count; } 108 109 void increment_count(int diff) { _count += diff; } 110 111 int offset_span() const { return _count * heapOopSize; } 112 113 int end_offset() const { 114 return offset() + offset_span(); 115 } 116 117 bool is_contiguous(int another_offset) const { 118 return another_offset == end_offset(); 119 } 120 121 // sizeof(OopMapBlock) in words. 122 static int size_in_words() { 123 return align_up((int)sizeof(OopMapBlock), wordSize) >> 124 LogBytesPerWord; 125 } 126 127 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) { 128 return a->offset() - b->offset(); 129 } 130 131 private: 132 int _offset; 133 uint _count; 134 }; 135 136 struct JvmtiCachedClassFileData; 137 138 class SigEntry; 139 140 class InlineKlassFixedBlock { 141 Array<SigEntry>** _extended_sig; 142 Array<VMRegPair>** _return_regs; 143 address* _pack_handler; 144 address* _pack_handler_jobject; 145 address* _unpack_handler; 146 int* _default_value_offset; 147 ArrayKlass** _null_free_inline_array_klasses; 148 int _alignment; 149 int _first_field_offset; 150 int _payload_size_in_bytes; 151 int _internal_null_marker_offset; // -1 if none 152 153 friend class InlineKlass; 154 }; 155 156 class InstanceKlass: public Klass { 157 friend class VMStructs; 158 friend class JVMCIVMStructs; 159 friend class ClassFileParser; 160 friend class CompileReplay; 161 friend class TemplateTable; 162 163 public: 164 static const KlassKind Kind = InstanceKlassKind; 165 166 protected: 167 InstanceKlass(const ClassFileParser& parser, KlassKind kind = Kind, ReferenceType reference_type = REF_NONE); 168 169 public: 170 InstanceKlass(); 171 172 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 173 // of the class loading & initialization procedure, and the use of the states. 174 enum ClassState : u1 { 175 allocated, // allocated (but not yet linked) 176 loaded, // loaded and inserted in class hierarchy (but not linked yet) 177 being_linked, // currently running verifier and rewriter 178 linked, // successfully linked/verified (but not initialized yet) 179 being_initialized, // currently running class initializer 180 fully_initialized, // initialized (successful final state) 181 initialization_error // error happened during initialization 182 }; 183 184 private: 185 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS); 186 187 protected: 188 // If you add a new field that points to any metaspace object, you 189 // must add this field to InstanceKlass::metaspace_pointers_do(). 190 191 // Annotations for this class 192 Annotations* _annotations; 193 // Package this class is defined in 194 PackageEntry* _package_entry; 195 // Array classes holding elements of this class. 196 ArrayKlass* volatile _array_klasses; 197 // Constant pool for this class. 198 ConstantPool* _constants; 199 // The InnerClasses attribute and EnclosingMethod attribute. The 200 // _inner_classes is an array of shorts. If the class has InnerClasses 201 // attribute, then the _inner_classes array begins with 4-tuples of shorts 202 // [inner_class_info_index, outer_class_info_index, 203 // inner_name_index, inner_class_access_flags] for the InnerClasses 204 // attribute. If the EnclosingMethod attribute exists, it occupies the 205 // last two shorts [class_index, method_index] of the array. If only 206 // the InnerClasses attribute exists, the _inner_classes array length is 207 // number_of_inner_classes * 4. If the class has both InnerClasses 208 // and EnclosingMethod attributes the _inner_classes array length is 209 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 210 Array<jushort>* _inner_classes; 211 212 // The NestMembers attribute. An array of shorts, where each is a 213 // class info index for the class that is a nest member. This data 214 // has not been validated. 215 Array<jushort>* _nest_members; 216 217 // Resolved nest-host klass: either true nest-host or self if we are not 218 // nested, or an error occurred resolving or validating the nominated 219 // nest-host. Can also be set directly by JDK API's that establish nest 220 // relationships. 221 // By always being set it makes nest-member access checks simpler. 222 InstanceKlass* _nest_host; 223 224 // The PermittedSubclasses attribute. An array of shorts, where each is a 225 // class info index for the class that is a permitted subclass. 226 Array<jushort>* _permitted_subclasses; 227 228 // The contents of the Record attribute. 229 Array<RecordComponent*>* _record_components; 230 231 // the source debug extension for this klass, null if not specified. 232 // Specified as UTF-8 string without terminating zero byte in the classfile, 233 // it is stored in the instanceklass as a null-terminated UTF-8 string 234 const char* _source_debug_extension; 235 236 // Number of heapOopSize words used by non-static fields in this klass 237 // (including inherited fields but after header_size()). 238 int _nonstatic_field_size; 239 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 240 int _nonstatic_oop_map_size; // size in words of nonstatic oop map blocks 241 int _itable_len; // length of Java itable (in words) 242 243 // The NestHost attribute. The class info index for the class 244 // that is the nest-host of this class. This data has not been validated. 245 u2 _nest_host_index; 246 u2 _this_class_index; // constant pool entry 247 u2 _static_oop_field_count; // number of static oop fields in this klass 248 249 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 250 251 volatile ClassState _init_state; // state of class 252 253 u1 _reference_type; // reference type 254 255 // State is set either at parse time or while executing, atomically to not disturb other state 256 InstanceKlassFlags _misc_flags; 257 258 Monitor* _init_monitor; // mutual exclusion to _init_state and _init_thread. 259 JavaThread* volatile _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization) 260 261 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 262 JNIid* _jni_ids; // First JNI identifier for static fields in this class 263 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or null if none 264 nmethodBucket* volatile _dep_context; // packed DependencyContext structure 265 uint64_t volatile _dep_context_last_cleaned; 266 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 267 #if INCLUDE_JVMTI 268 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 269 // Linked instanceKlasses of previous versions 270 InstanceKlass* _previous_versions; 271 // JVMTI fields can be moved to their own structure - see 6315920 272 // JVMTI: cached class file, before retransformable agent modified it in CFLH 273 JvmtiCachedClassFileData* _cached_class_file; 274 #endif 275 276 #if INCLUDE_JVMTI 277 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 278 #endif 279 280 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 281 NOT_PRODUCT(volatile int _shared_class_load_count;) // ensure a shared class is loaded only once 282 283 // Method array. 284 Array<Method*>* _methods; 285 // Default Method Array, concrete methods inherited from interfaces 286 Array<Method*>* _default_methods; 287 // Interfaces (InstanceKlass*s) this class declares locally to implement. 288 Array<InstanceKlass*>* _local_interfaces; 289 // Interfaces (InstanceKlass*s) this class implements transitively. 290 Array<InstanceKlass*>* _transitive_interfaces; 291 // Int array containing the original order of method in the class file (for JVMTI). 292 Array<int>* _method_ordering; 293 // Int array containing the vtable_indices for default_methods 294 // offset matches _default_methods offset 295 Array<int>* _default_vtable_indices; 296 297 // Fields information is stored in an UNSIGNED5 encoded stream (see fieldInfo.hpp) 298 Array<u1>* _fieldinfo_stream; 299 Array<FieldStatus>* _fields_status; 300 301 Array<InlineKlass*>* _inline_type_field_klasses; // For "inline class" fields, null if none present 302 Array<int>* _null_marker_offsets; // for flat fields with a null marker 303 Array<u2>* _loadable_descriptors; 304 const InlineKlassFixedBlock* _adr_inlineklass_fixed_block; 305 306 // embedded Java vtable follows here 307 // embedded Java itables follows here 308 // embedded static fields follows here 309 // embedded nonstatic oop-map blocks follows here 310 // embedded implementor of this interface follows here 311 // The embedded implementor only exists if the current klass is an 312 // interface. The possible values of the implementor fall into following 313 // three cases: 314 // null: no implementor. 315 // A Klass* that's not itself: one implementor. 316 // Itself: more than one implementors. 317 // 318 319 friend class SystemDictionary; 320 321 static bool _disable_method_binary_search; 322 323 // Controls finalizer registration 324 static bool _finalization_enabled; 325 326 public: 327 328 // Queries finalization state 329 static bool is_finalization_enabled() { return _finalization_enabled; } 330 331 // Sets finalization state 332 static void set_finalization_enabled(bool val) { _finalization_enabled = val; } 333 334 // The three BUILTIN class loader types 335 bool is_shared_boot_class() const { return _misc_flags.is_shared_boot_class(); } 336 bool is_shared_platform_class() const { return _misc_flags.is_shared_platform_class(); } 337 bool is_shared_app_class() const { return _misc_flags.is_shared_app_class(); } 338 // The UNREGISTERED class loader type 339 bool is_shared_unregistered_class() const { return _misc_flags.is_shared_unregistered_class(); } 340 341 // Check if the class can be shared in CDS 342 bool is_shareable() const; 343 344 bool shared_loading_failed() const { return _misc_flags.shared_loading_failed(); } 345 346 void set_shared_loading_failed() { _misc_flags.set_shared_loading_failed(true); } 347 348 #if INCLUDE_CDS 349 void set_shared_class_loader_type(s2 loader_type) { _misc_flags.set_shared_class_loader_type(loader_type); } 350 void assign_class_loader_type() { _misc_flags.assign_class_loader_type(_class_loader_data); } 351 #endif 352 353 bool has_nonstatic_fields() const { return _misc_flags.has_nonstatic_fields(); } 354 void set_has_nonstatic_fields(bool b) { _misc_flags.set_has_nonstatic_fields(b); } 355 356 bool has_localvariable_table() const { return _misc_flags.has_localvariable_table(); } 357 void set_has_localvariable_table(bool b) { _misc_flags.set_has_localvariable_table(b); } 358 359 bool has_inline_type_fields() const { return _misc_flags.has_inline_type_fields(); } 360 void set_has_inline_type_fields() { _misc_flags.set_has_inline_type_fields(true); } 361 362 bool is_empty_inline_type() const { return _misc_flags.is_empty_inline_type(); } 363 void set_is_empty_inline_type() { _misc_flags.set_is_empty_inline_type(true); } 364 365 // Note: The naturally_atomic property only applies to 366 // inline classes; it is never true on identity classes. 367 // The bit is placed on instanceKlass for convenience. 368 369 // Query if h/w provides atomic load/store for instances. 370 bool is_naturally_atomic() const { return _misc_flags.is_naturally_atomic(); } 371 void set_is_naturally_atomic() { _misc_flags.set_is_naturally_atomic(true); } 372 373 // Query if this class is mentioned in the JVM option ForceNonTearable. 374 // This bit can occur anywhere, but is only significant 375 // for inline classes *and* their super types. 376 // It inherits from supers. 377 bool must_be_atomic() const { return _misc_flags.must_be_atomic(); } 378 void set_must_be_atomic() { _misc_flags.set_must_be_atomic(true); } 379 380 bool is_implicitly_constructible() const { return _misc_flags.is_implicitly_constructible(); } 381 void set_is_implicitly_constructible() { _misc_flags.set_is_implicitly_constructible(true); } 382 383 // field sizes 384 int nonstatic_field_size() const { return _nonstatic_field_size; } 385 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 386 387 int static_field_size() const { return _static_field_size; } 388 void set_static_field_size(int size) { _static_field_size = size; } 389 390 int static_oop_field_count() const { return (int)_static_oop_field_count; } 391 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 392 393 // Java itable 394 int itable_length() const { return _itable_len; } 395 void set_itable_length(int len) { _itable_len = len; } 396 397 // array klasses 398 ArrayKlass* array_klasses() const { return _array_klasses; } 399 inline ArrayKlass* array_klasses_acquire() const; // load with acquire semantics 400 inline void release_set_array_klasses(ArrayKlass* k); // store with release semantics 401 void set_array_klasses(ArrayKlass* k) { _array_klasses = k; } 402 403 // methods 404 Array<Method*>* methods() const { return _methods; } 405 void set_methods(Array<Method*>* a) { _methods = a; } 406 Method* method_with_idnum(int idnum); 407 Method* method_with_orig_idnum(int idnum); 408 Method* method_with_orig_idnum(int idnum, int version); 409 410 // method ordering 411 Array<int>* method_ordering() const { return _method_ordering; } 412 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 413 void copy_method_ordering(const intArray* m, TRAPS); 414 415 // default_methods 416 Array<Method*>* default_methods() const { return _default_methods; } 417 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 418 419 // default method vtable_indices 420 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 421 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 422 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 423 424 // interfaces 425 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; } 426 void set_local_interfaces(Array<InstanceKlass*>* a) { 427 guarantee(_local_interfaces == nullptr || a == nullptr, "Just checking"); 428 _local_interfaces = a; } 429 430 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; } 431 void set_transitive_interfaces(Array<InstanceKlass*>* a) { 432 guarantee(_transitive_interfaces == nullptr || a == nullptr, "Just checking"); 433 _transitive_interfaces = a; 434 } 435 436 private: 437 friend class fieldDescriptor; 438 FieldInfo field(int index) const; 439 440 public: 441 int field_offset (int index) const { return field(index).offset(); } 442 int field_access_flags(int index) const { return field(index).access_flags().as_int(); } 443 FieldInfo::FieldFlags field_flags(int index) const { return field(index).field_flags(); } 444 FieldStatus field_status(int index) const { return fields_status()->at(index); } 445 inline Symbol* field_name (int index) const; 446 inline Symbol* field_signature (int index) const; 447 bool field_is_flat(int index) const { return field_flags(index).is_flat(); } 448 bool field_has_null_marker(int index) const { return field_flags(index).has_null_marker(); } 449 bool field_is_null_free_inline_type(int index) const; 450 bool is_class_in_loadable_descriptors_attribute(Symbol* name) const; 451 452 // Number of Java declared fields 453 int java_fields_count() const; 454 int total_fields_count() const; 455 456 Array<u1>* fieldinfo_stream() const { return _fieldinfo_stream; } 457 void set_fieldinfo_stream(Array<u1>* fis) { _fieldinfo_stream = fis; } 458 459 Array<FieldStatus>* fields_status() const {return _fields_status; } 460 void set_fields_status(Array<FieldStatus>* array) { _fields_status = array; } 461 462 Array<u2>* loadable_descriptors() const { return _loadable_descriptors; } 463 void set_loadable_descriptors(Array<u2>* c) { _loadable_descriptors = c; } 464 465 // inner classes 466 Array<u2>* inner_classes() const { return _inner_classes; } 467 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 468 469 // nest members 470 Array<u2>* nest_members() const { return _nest_members; } 471 void set_nest_members(Array<u2>* m) { _nest_members = m; } 472 473 // nest-host index 474 jushort nest_host_index() const { return _nest_host_index; } 475 void set_nest_host_index(u2 i) { _nest_host_index = i; } 476 // dynamic nest member support 477 void set_nest_host(InstanceKlass* host); 478 479 // record components 480 Array<RecordComponent*>* record_components() const { return _record_components; } 481 void set_record_components(Array<RecordComponent*>* record_components) { 482 _record_components = record_components; 483 } 484 bool is_record() const; 485 486 // permitted subclasses 487 Array<u2>* permitted_subclasses() const { return _permitted_subclasses; } 488 void set_permitted_subclasses(Array<u2>* s) { _permitted_subclasses = s; } 489 490 private: 491 // Called to verify that k is a member of this nest - does not look at k's nest-host, 492 // nor does it resolve any CP entries or load any classes. 493 bool has_nest_member(JavaThread* current, InstanceKlass* k) const; 494 495 public: 496 // Call this only if you know that the nest host has been initialized. 497 InstanceKlass* nest_host_not_null() { 498 assert(_nest_host != nullptr, "must be"); 499 return _nest_host; 500 } 501 // Used to construct informative IllegalAccessError messages at a higher level, 502 // if there was an issue resolving or validating the nest host. 503 // Returns null if there was no error. 504 const char* nest_host_error(); 505 // Returns nest-host class, resolving and validating it if needed. 506 // Returns null if resolution is not possible from the calling context. 507 InstanceKlass* nest_host(TRAPS); 508 // Check if this klass is a nestmate of k - resolves this nest-host and k's 509 bool has_nestmate_access_to(InstanceKlass* k, TRAPS); 510 511 // Called to verify that k is a permitted subclass of this class 512 bool has_as_permitted_subclass(const InstanceKlass* k) const; 513 514 enum InnerClassAttributeOffset { 515 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 516 inner_class_inner_class_info_offset = 0, 517 inner_class_outer_class_info_offset = 1, 518 inner_class_inner_name_offset = 2, 519 inner_class_access_flags_offset = 3, 520 inner_class_next_offset = 4 521 }; 522 523 enum EnclosingMethodAttributeOffset { 524 enclosing_method_class_index_offset = 0, 525 enclosing_method_method_index_offset = 1, 526 enclosing_method_attribute_size = 2 527 }; 528 529 // package 530 PackageEntry* package() const { return _package_entry; } 531 ModuleEntry* module() const; 532 bool in_unnamed_package() const { return (_package_entry == nullptr); } 533 void set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS); 534 // If the package for the InstanceKlass is in the boot loader's package entry 535 // table then sets the classpath_index field so that 536 // get_system_package() will know to return a non-null value for the 537 // package's location. And, so that the package will be added to the list of 538 // packages returned by get_system_packages(). 539 // For packages whose classes are loaded from the boot loader class path, the 540 // classpath_index indicates which entry on the boot loader class path. 541 void set_classpath_index(s2 path_index); 542 bool is_same_class_package(const Klass* class2) const; 543 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const; 544 545 // find an enclosing class 546 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 547 548 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 549 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 550 551 private: 552 // Check prohibited package ("java/" only loadable by boot or platform loaders) 553 static void check_prohibited_package(Symbol* class_name, 554 ClassLoaderData* loader_data, 555 TRAPS); 556 557 JavaThread* init_thread() { return Atomic::load(&_init_thread); } 558 // We can safely access the name as long as we hold the _init_monitor. 559 const char* init_thread_name() { 560 assert(_init_monitor->owned_by_self(), "Must hold _init_monitor here"); 561 return init_thread()->name_raw(); 562 } 563 564 public: 565 // initialization state 566 bool is_loaded() const { return init_state() >= loaded; } 567 bool is_linked() const { return init_state() >= linked; } 568 bool is_being_linked() const { return init_state() == being_linked; } 569 bool is_initialized() const { return init_state() == fully_initialized; } 570 bool is_not_initialized() const { return init_state() < being_initialized; } 571 bool is_being_initialized() const { return init_state() == being_initialized; } 572 bool is_in_error_state() const { return init_state() == initialization_error; } 573 bool is_init_thread(JavaThread *thread) { return thread == init_thread(); } 574 ClassState init_state() const { return Atomic::load(&_init_state); } 575 const char* init_state_name() const; 576 bool is_rewritten() const { return _misc_flags.rewritten(); } 577 578 class LockLinkState : public StackObj { 579 InstanceKlass* _ik; 580 JavaThread* _current; 581 public: 582 LockLinkState(InstanceKlass* ik, JavaThread* current) : _ik(ik), _current(current) { 583 ik->check_link_state_and_wait(current); 584 } 585 ~LockLinkState() { 586 if (!_ik->is_linked()) { 587 // Reset to loaded if linking failed. 588 _ik->set_initialization_state_and_notify(loaded, _current); 589 } 590 } 591 }; 592 593 // is this a sealed class 594 bool is_sealed() const; 595 596 // defineClass specified verification 597 bool should_verify_class() const { return _misc_flags.should_verify_class(); } 598 void set_should_verify_class(bool value) { _misc_flags.set_should_verify_class(value); } 599 600 // marking 601 bool is_marked_dependent() const { return _misc_flags.is_marked_dependent(); } 602 void set_is_marked_dependent(bool value) { _misc_flags.set_is_marked_dependent(value); } 603 604 static ByteSize kind_offset() { return in_ByteSize(offset_of(InstanceKlass, _kind)); } 605 static ByteSize misc_flags_offset() { return in_ByteSize(offset_of(InstanceKlass, _misc_flags)); } 606 607 // initialization (virtuals from Klass) 608 bool should_be_initialized() const; // means that initialize should be called 609 void initialize(TRAPS); 610 void link_class(TRAPS); 611 bool link_class_or_fail(TRAPS); // returns false on failure 612 void rewrite_class(TRAPS); 613 void link_methods(TRAPS); 614 Method* class_initializer() const; 615 616 // reference type 617 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 618 619 // this class cp index 620 u2 this_class_index() const { return _this_class_index; } 621 void set_this_class_index(u2 index) { _this_class_index = index; } 622 623 static ByteSize reference_type_offset() { return byte_offset_of(InstanceKlass, _reference_type); } 624 625 // find local field, returns true if found 626 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 627 // find field in direct superinterfaces, returns the interface in which the field is defined 628 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 629 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 630 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 631 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 632 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 633 634 // find a non-static or static field given its offset within the class. 635 bool contains_field_offset(int offset); 636 637 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 638 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 639 640 private: 641 inline static int quick_search(const Array<Method*>* methods, const Symbol* name); 642 643 public: 644 static void disable_method_binary_search() { 645 _disable_method_binary_search = true; 646 } 647 648 // find a local method (returns null if not found) 649 Method* find_method(const Symbol* name, const Symbol* signature) const; 650 static Method* find_method(const Array<Method*>* methods, 651 const Symbol* name, 652 const Symbol* signature); 653 654 // find a local method, but skip static methods 655 Method* find_instance_method(const Symbol* name, const Symbol* signature, 656 PrivateLookupMode private_mode) const; 657 static Method* find_instance_method(const Array<Method*>* methods, 658 const Symbol* name, 659 const Symbol* signature, 660 PrivateLookupMode private_mode); 661 662 // find a local method (returns null if not found) 663 Method* find_local_method(const Symbol* name, 664 const Symbol* signature, 665 OverpassLookupMode overpass_mode, 666 StaticLookupMode static_mode, 667 PrivateLookupMode private_mode) const; 668 669 // find a local method from given methods array (returns null if not found) 670 static Method* find_local_method(const Array<Method*>* methods, 671 const Symbol* name, 672 const Symbol* signature, 673 OverpassLookupMode overpass_mode, 674 StaticLookupMode static_mode, 675 PrivateLookupMode private_mode); 676 677 // find a local method index in methods or default_methods (returns -1 if not found) 678 static int find_method_index(const Array<Method*>* methods, 679 const Symbol* name, 680 const Symbol* signature, 681 OverpassLookupMode overpass_mode, 682 StaticLookupMode static_mode, 683 PrivateLookupMode private_mode); 684 685 // lookup operation (returns null if not found) 686 Method* uncached_lookup_method(const Symbol* name, 687 const Symbol* signature, 688 OverpassLookupMode overpass_mode, 689 PrivateLookupMode private_mode = PrivateLookupMode::find) const; 690 691 // lookup a method in all the interfaces that this class implements 692 // (returns null if not found) 693 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 694 695 // lookup a method in local defaults then in all interfaces 696 // (returns null if not found) 697 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 698 699 // Find method indices by name. If a method with the specified name is 700 // found the index to the first method is returned, and 'end' is filled in 701 // with the index of first non-name-matching method. If no method is found 702 // -1 is returned. 703 int find_method_by_name(const Symbol* name, int* end) const; 704 static int find_method_by_name(const Array<Method*>* methods, 705 const Symbol* name, int* end); 706 707 // constant pool 708 ConstantPool* constants() const { return _constants; } 709 void set_constants(ConstantPool* c) { _constants = c; } 710 711 // protection domain 712 oop protection_domain() const; 713 714 // signers 715 objArrayOop signers() const; 716 717 bool is_contended() const { return _misc_flags.is_contended(); } 718 void set_is_contended(bool value) { _misc_flags.set_is_contended(value); } 719 720 // source file name 721 Symbol* source_file_name() const; 722 u2 source_file_name_index() const; 723 void set_source_file_name_index(u2 sourcefile_index); 724 725 // minor and major version numbers of class file 726 u2 minor_version() const; 727 void set_minor_version(u2 minor_version); 728 u2 major_version() const; 729 void set_major_version(u2 major_version); 730 731 // source debug extension 732 const char* source_debug_extension() const { return _source_debug_extension; } 733 void set_source_debug_extension(const char* array, int length); 734 735 // nonstatic oop-map blocks 736 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 737 return oop_map_count * OopMapBlock::size_in_words(); 738 } 739 unsigned int nonstatic_oop_map_count() const { 740 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 741 } 742 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 743 void set_nonstatic_oop_map_size(int words) { 744 _nonstatic_oop_map_size = words; 745 } 746 747 bool has_contended_annotations() const { return _misc_flags.has_contended_annotations(); } 748 void set_has_contended_annotations(bool value) { _misc_flags.set_has_contended_annotations(value); } 749 750 #if INCLUDE_JVMTI 751 // Redefinition locking. Class can only be redefined by one thread at a time. 752 // The flag is in access_flags so that it can be set and reset using atomic 753 // operations, and not be reset by other misc_flag settings. 754 bool is_being_redefined() const { return _misc_flags.is_being_redefined(); } 755 void set_is_being_redefined(bool value) { _misc_flags.set_is_being_redefined(value); } 756 757 // RedefineClasses() support for previous versions: 758 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 759 void purge_previous_version_list(); 760 761 InstanceKlass* previous_versions() const { return _previous_versions; } 762 #else 763 InstanceKlass* previous_versions() const { return nullptr; } 764 #endif 765 766 InstanceKlass* get_klass_version(int version); 767 768 bool has_been_redefined() const { return _misc_flags.has_been_redefined(); } 769 void set_has_been_redefined() { _misc_flags.set_has_been_redefined(true); } 770 771 bool is_scratch_class() const { return _misc_flags.is_scratch_class(); } 772 void set_is_scratch_class() { _misc_flags.set_is_scratch_class(true); } 773 774 bool has_resolved_methods() const { return _misc_flags.has_resolved_methods(); } 775 void set_has_resolved_methods() { _misc_flags.set_has_resolved_methods(true); } 776 void set_has_resolved_methods(bool value) { _misc_flags.set_has_resolved_methods(value); } 777 778 public: 779 #if INCLUDE_JVMTI 780 781 void init_previous_versions() { 782 _previous_versions = nullptr; 783 } 784 785 private: 786 static bool _should_clean_previous_versions; 787 public: 788 static void purge_previous_versions(InstanceKlass* ik) { 789 if (ik->has_been_redefined()) { 790 ik->purge_previous_version_list(); 791 } 792 } 793 794 static bool should_clean_previous_versions_and_reset(); 795 static bool should_clean_previous_versions() { return _should_clean_previous_versions; } 796 797 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 798 void set_cached_class_file(JvmtiCachedClassFileData *data) { 799 _cached_class_file = data; 800 } 801 JvmtiCachedClassFileData * get_cached_class_file(); 802 jint get_cached_class_file_len(); 803 unsigned char * get_cached_class_file_bytes(); 804 805 // JVMTI: Support for caching of field indices, types, and offsets 806 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 807 _jvmti_cached_class_field_map = descriptor; 808 } 809 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 810 return _jvmti_cached_class_field_map; 811 } 812 #else // INCLUDE_JVMTI 813 814 static void purge_previous_versions(InstanceKlass* ik) { return; }; 815 static bool should_clean_previous_versions_and_reset() { return false; } 816 817 void set_cached_class_file(JvmtiCachedClassFileData *data) { 818 assert(data == nullptr, "unexpected call with JVMTI disabled"); 819 } 820 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)nullptr; } 821 822 #endif // INCLUDE_JVMTI 823 824 bool has_nonstatic_concrete_methods() const { return _misc_flags.has_nonstatic_concrete_methods(); } 825 void set_has_nonstatic_concrete_methods(bool b) { _misc_flags.set_has_nonstatic_concrete_methods(b); } 826 827 bool declares_nonstatic_concrete_methods() const { return _misc_flags.declares_nonstatic_concrete_methods(); } 828 void set_declares_nonstatic_concrete_methods(bool b) { _misc_flags.set_declares_nonstatic_concrete_methods(b); } 829 830 bool has_miranda_methods () const { return _misc_flags.has_miranda_methods(); } 831 void set_has_miranda_methods() { _misc_flags.set_has_miranda_methods(true); } 832 bool has_final_method() const { return _misc_flags.has_final_method(); } 833 void set_has_final_method() { _misc_flags.set_has_final_method(true); } 834 835 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 836 inline u2 next_method_idnum(); 837 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 838 839 // generics support 840 Symbol* generic_signature() const; 841 u2 generic_signature_index() const; 842 void set_generic_signature_index(u2 sig_index); 843 844 u2 enclosing_method_data(int offset) const; 845 u2 enclosing_method_class_index() const { 846 return enclosing_method_data(enclosing_method_class_index_offset); 847 } 848 u2 enclosing_method_method_index() { 849 return enclosing_method_data(enclosing_method_method_index_offset); 850 } 851 void set_enclosing_method_indices(u2 class_index, 852 u2 method_index); 853 854 // jmethodID support 855 jmethodID get_jmethod_id(const methodHandle& method_h); 856 void ensure_space_for_methodids(int start_offset = 0); 857 jmethodID jmethod_id_or_null(Method* method); 858 void update_methods_jmethod_cache(); 859 860 // annotations support 861 Annotations* annotations() const { return _annotations; } 862 void set_annotations(Annotations* anno) { _annotations = anno; } 863 864 AnnotationArray* class_annotations() const { 865 return (_annotations != nullptr) ? _annotations->class_annotations() : nullptr; 866 } 867 Array<AnnotationArray*>* fields_annotations() const { 868 return (_annotations != nullptr) ? _annotations->fields_annotations() : nullptr; 869 } 870 AnnotationArray* class_type_annotations() const { 871 return (_annotations != nullptr) ? _annotations->class_type_annotations() : nullptr; 872 } 873 Array<AnnotationArray*>* fields_type_annotations() const { 874 return (_annotations != nullptr) ? _annotations->fields_type_annotations() : nullptr; 875 } 876 // allocation 877 instanceOop allocate_instance(TRAPS); 878 static instanceOop allocate_instance(oop cls, TRAPS); 879 880 // additional member function to return a handle 881 instanceHandle allocate_instance_handle(TRAPS); 882 883 objArrayOop allocate_objArray(int n, int length, TRAPS); 884 // Helper function 885 static instanceOop register_finalizer(instanceOop i, TRAPS); 886 887 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 888 // if not, throw either an Error or an Exception. 889 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 890 891 // initialization 892 void call_class_initializer(TRAPS); 893 void set_initialization_state_and_notify(ClassState state, JavaThread* current); 894 895 // OopMapCache support 896 OopMapCache* oop_map_cache() { return _oop_map_cache; } 897 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 898 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 899 900 // JNI identifier support (for static fields - for jni performance) 901 JNIid* jni_ids() { return _jni_ids; } 902 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 903 JNIid* jni_id_for(int offset); 904 905 // maintenance of deoptimization dependencies 906 inline DependencyContext dependencies(); 907 void mark_dependent_nmethods(DeoptimizationScope* deopt_scope, KlassDepChange& changes); 908 void add_dependent_nmethod(nmethod* nm); 909 void clean_dependency_context(); 910 // Setup link to hierarchy and deoptimize 911 void add_to_hierarchy(JavaThread* current); 912 913 // On-stack replacement support 914 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 915 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 916 void add_osr_nmethod(nmethod* n); 917 bool remove_osr_nmethod(nmethod* n); 918 int mark_osr_nmethods(DeoptimizationScope* deopt_scope, const Method* m); 919 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 920 921 #if INCLUDE_JVMTI 922 // Breakpoint support (see methods on Method* for details) 923 BreakpointInfo* breakpoints() const { return _breakpoints; }; 924 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 925 #endif 926 927 // support for stub routines 928 static ByteSize init_state_offset() { return byte_offset_of(InstanceKlass, _init_state); } 929 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;) 930 static ByteSize init_thread_offset() { return byte_offset_of(InstanceKlass, _init_thread); } 931 932 static ByteSize inline_type_field_klasses_offset() { return in_ByteSize(offset_of(InstanceKlass, _inline_type_field_klasses)); } 933 static ByteSize null_marker_array_offset() { return in_ByteSize(offset_of(InstanceKlass, _null_marker_offsets)); } 934 static ByteSize adr_inlineklass_fixed_block_offset() { return in_ByteSize(offset_of(InstanceKlass, _adr_inlineklass_fixed_block)); } 935 936 // subclass/subinterface checks 937 bool implements_interface(Klass* k) const; 938 bool is_same_or_direct_interface(Klass* k) const; 939 940 #ifdef ASSERT 941 // check whether this class or one of its superclasses was redefined 942 bool has_redefined_this_or_super() const; 943 #endif 944 945 // Access to the implementor of an interface. 946 InstanceKlass* implementor() const; 947 void set_implementor(InstanceKlass* ik); 948 int nof_implementors() const; 949 void add_implementor(InstanceKlass* ik); // ik is a new class that implements this interface 950 void init_implementor(); // initialize 951 952 private: 953 // link this class into the implementors list of every interface it implements 954 void process_interfaces(); 955 956 public: 957 // virtual operations from Klass 958 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 959 Array<InstanceKlass*>* transitive_interfaces); 960 bool can_be_primary_super_slow() const; 961 size_t oop_size(oop obj) const { return size_helper(); } 962 // slow because it's a virtual call and used for verifying the layout_helper. 963 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 964 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 965 966 // Iterators 967 void do_local_static_fields(FieldClosure* cl); 968 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 969 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 970 void print_nonstatic_fields(FieldClosure* cl); // including inherited and injected fields 971 972 void methods_do(void f(Method* method)); 973 974 static InstanceKlass* cast(Klass* k) { 975 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 976 } 977 978 static const InstanceKlass* cast(const Klass* k) { 979 assert(k != nullptr, "k should not be null"); 980 assert(k->is_instance_klass(), "cast to InstanceKlass"); 981 return static_cast<const InstanceKlass*>(k); 982 } 983 984 virtual InstanceKlass* java_super() const { 985 return (super() == nullptr) ? nullptr : cast(super()); 986 } 987 988 // Sizing (in words) 989 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 990 991 static int size(int vtable_length, int itable_length, 992 int nonstatic_oop_map_size, 993 bool is_interface, 994 bool is_inline_type) { 995 return align_metadata_size(header_size() + 996 vtable_length + 997 itable_length + 998 nonstatic_oop_map_size + 999 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 1000 (is_inline_type ? (int)sizeof(InlineKlassFixedBlock) : 0)); 1001 } 1002 1003 int size() const { return size(vtable_length(), 1004 itable_length(), 1005 nonstatic_oop_map_size(), 1006 is_interface(), 1007 is_inline_klass()); 1008 } 1009 1010 1011 inline intptr_t* start_of_itable() const; 1012 inline intptr_t* end_of_itable() const; 1013 inline oop static_field_base_raw(); 1014 bool bounds_check(address addr, bool edge_ok = false, intptr_t size_in_bytes = -1) const PRODUCT_RETURN0; 1015 1016 inline OopMapBlock* start_of_nonstatic_oop_maps() const; 1017 inline Klass** end_of_nonstatic_oop_maps() const; 1018 1019 inline InstanceKlass* volatile* adr_implementor() const; 1020 1021 Array<InlineKlass*>* inline_type_field_klasses_array() const { return _inline_type_field_klasses; } 1022 void set_inline_type_field_klasses_array(Array<InlineKlass*>* array) { _inline_type_field_klasses = array; } 1023 1024 Array<int>* null_marker_offsets_array() const { return _null_marker_offsets; } 1025 void set_null_marker_offsets_array(Array<int>* array) { _null_marker_offsets = array; } 1026 1027 inline InlineKlass* get_inline_type_field_klass(int idx) const; 1028 inline InlineKlass* get_inline_type_field_klass_or_null(int idx) const; 1029 inline void set_inline_type_field_klass(int idx, InlineKlass* k); 1030 inline void reset_inline_type_field_klass(int idx); 1031 1032 // Use this to return the size of an instance in heap words: 1033 virtual int size_helper() const { 1034 return layout_helper_to_size_helper(layout_helper()); 1035 } 1036 1037 // This bit is initialized in classFileParser.cpp. 1038 // It is false under any of the following conditions: 1039 // - the class is abstract (including any interface) 1040 // - the class size is larger than FastAllocateSizeLimit 1041 // - the class is java/lang/Class, which cannot be allocated directly 1042 bool can_be_fastpath_allocated() const { 1043 return !layout_helper_needs_slow_path(layout_helper()); 1044 } 1045 1046 // Java itable 1047 klassItable itable() const; // return klassItable wrapper 1048 Method* method_at_itable(InstanceKlass* holder, int index, TRAPS); 1049 Method* method_at_itable_or_null(InstanceKlass* holder, int index, bool& itable_entry_found); 1050 int vtable_index_of_interface_method(Method* method); 1051 1052 #if INCLUDE_JVMTI 1053 void adjust_default_methods(bool* trace_name_printed); 1054 #endif // INCLUDE_JVMTI 1055 1056 void clean_weak_instanceklass_links(); 1057 private: 1058 void clean_implementors_list(); 1059 void clean_method_data(); 1060 1061 public: 1062 // Explicit metaspace deallocation of fields 1063 // For RedefineClasses and class file parsing errors, we need to deallocate 1064 // instanceKlasses and the metadata they point to. 1065 void deallocate_contents(ClassLoaderData* loader_data); 1066 static void deallocate_methods(ClassLoaderData* loader_data, 1067 Array<Method*>* methods); 1068 void static deallocate_interfaces(ClassLoaderData* loader_data, 1069 const Klass* super_klass, 1070 Array<InstanceKlass*>* local_interfaces, 1071 Array<InstanceKlass*>* transitive_interfaces); 1072 void static deallocate_record_components(ClassLoaderData* loader_data, 1073 Array<RecordComponent*>* record_component); 1074 1075 virtual bool on_stack() const; 1076 1077 // callbacks for actions during class unloading 1078 static void unload_class(InstanceKlass* ik); 1079 1080 virtual void release_C_heap_structures(bool release_sub_metadata = true); 1081 1082 // Naming 1083 const char* signature_name() const; 1084 const char* signature_name_of_carrier(char c) const; 1085 1086 // Oop fields (and metadata) iterators 1087 // 1088 // The InstanceKlass iterators also visits the Object's klass. 1089 1090 // Forward iteration 1091 public: 1092 // Iterate over all oop fields in the oop maps. 1093 template <typename T, class OopClosureType> 1094 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1095 1096 // Iterate over all oop fields and metadata. 1097 template <typename T, class OopClosureType> 1098 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 1099 1100 // Iterate over all oop fields in one oop map. 1101 template <typename T, class OopClosureType> 1102 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1103 1104 1105 // Reverse iteration 1106 // Iterate over all oop fields and metadata. 1107 template <typename T, class OopClosureType> 1108 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1109 1110 private: 1111 // Iterate over all oop fields in the oop maps. 1112 template <typename T, class OopClosureType> 1113 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1114 1115 // Iterate over all oop fields in one oop map. 1116 template <typename T, class OopClosureType> 1117 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1118 1119 1120 // Bounded range iteration 1121 public: 1122 // Iterate over all oop fields in the oop maps. 1123 template <typename T, class OopClosureType> 1124 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1125 1126 // Iterate over all oop fields and metadata. 1127 template <typename T, class OopClosureType> 1128 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1129 1130 private: 1131 // Iterate over all oop fields in one oop map. 1132 template <typename T, class OopClosureType> 1133 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1134 1135 1136 public: 1137 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1138 1139 private: 1140 // initialization state 1141 void set_init_state(ClassState state); 1142 void set_rewritten() { _misc_flags.set_rewritten(true); } 1143 void set_init_thread(JavaThread *thread) { 1144 assert((thread == JavaThread::current() && _init_thread == nullptr) || 1145 (thread == nullptr && _init_thread == JavaThread::current()), "Only one thread is allowed to own initialization"); 1146 Atomic::store(&_init_thread, thread); 1147 } 1148 1149 inline jmethodID* methods_jmethod_ids_acquire() const; 1150 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1151 // This nulls out jmethodIDs for all methods in 'klass' 1152 static void clear_jmethod_ids(InstanceKlass* klass); 1153 jmethodID update_jmethod_id(jmethodID* jmeths, Method* method, int idnum); 1154 1155 public: 1156 // Returns the array class for the n'th dimension 1157 virtual ArrayKlass* array_klass(int n, TRAPS); 1158 virtual ArrayKlass* array_klass_or_null(int n); 1159 1160 // Returns the array class with this class as element type 1161 virtual ArrayKlass* array_klass(TRAPS); 1162 virtual ArrayKlass* array_klass_or_null(); 1163 1164 static void clean_initialization_error_table(); 1165 1166 Monitor* init_monitor() const { return _init_monitor; } 1167 private: 1168 void check_link_state_and_wait(JavaThread* current); 1169 bool link_class_impl (TRAPS); 1170 bool verify_code (TRAPS); 1171 void initialize_impl (TRAPS); 1172 void initialize_super_interfaces (TRAPS); 1173 1174 void add_initialization_error(JavaThread* current, Handle exception); 1175 oop get_initialization_error(JavaThread* current); 1176 1177 // find a local method (returns null if not found) 1178 Method* find_method_impl(const Symbol* name, 1179 const Symbol* signature, 1180 OverpassLookupMode overpass_mode, 1181 StaticLookupMode static_mode, 1182 PrivateLookupMode private_mode) const; 1183 1184 static Method* find_method_impl(const Array<Method*>* methods, 1185 const Symbol* name, 1186 const Symbol* signature, 1187 OverpassLookupMode overpass_mode, 1188 StaticLookupMode static_mode, 1189 PrivateLookupMode private_mode); 1190 1191 #if INCLUDE_JVMTI 1192 // RedefineClasses support 1193 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1194 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1195 #endif 1196 // log class name to classlist 1197 void log_to_classlist() const; 1198 public: 1199 1200 #if INCLUDE_CDS 1201 // CDS support - remove and restore oops from metadata. Oops are not shared. 1202 virtual void remove_unshareable_info(); 1203 void remove_unshareable_flags(); 1204 virtual void remove_java_mirror(); 1205 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, PackageEntry* pkg_entry, TRAPS); 1206 void init_shared_package_entry(); 1207 bool can_be_verified_at_dumptime() const; 1208 bool methods_contain_jsr_bytecode() const; 1209 void compute_has_loops_flag_for_methods(); 1210 #endif 1211 1212 jint compute_modifier_flags() const; 1213 1214 public: 1215 // JVMTI support 1216 jint jvmti_class_status() const; 1217 1218 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1219 1220 public: 1221 // Printing 1222 void print_on(outputStream* st) const; 1223 void print_value_on(outputStream* st) const; 1224 1225 void oop_print_value_on(oop obj, outputStream* st); 1226 1227 void oop_print_on (oop obj, outputStream* st); 1228 1229 #ifndef PRODUCT 1230 void print_dependent_nmethods(bool verbose = false); 1231 bool is_dependent_nmethod(nmethod* nm); 1232 bool verify_itable_index(int index); 1233 #endif 1234 1235 const char* internal_name() const; 1236 1237 // Verification 1238 void verify_on(outputStream* st); 1239 1240 void oop_verify_on(oop obj, outputStream* st); 1241 1242 // Logging 1243 void print_class_load_logging(ClassLoaderData* loader_data, 1244 const ModuleEntry* module_entry, 1245 const ClassFileStream* cfs) const; 1246 private: 1247 void print_class_load_cause_logging() const; 1248 void print_class_load_helper(ClassLoaderData* loader_data, 1249 const ModuleEntry* module_entry, 1250 const ClassFileStream* cfs) const; 1251 }; 1252 1253 // for adding methods 1254 // UNSET_IDNUM return means no more ids available 1255 inline u2 InstanceKlass::next_method_idnum() { 1256 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1257 return ConstMethod::UNSET_IDNUM; // no more ids available 1258 } else { 1259 return _idnum_allocated_count++; 1260 } 1261 } 1262 1263 class PrintClassClosure : public KlassClosure { 1264 private: 1265 outputStream* _st; 1266 bool _verbose; 1267 public: 1268 PrintClassClosure(outputStream* st, bool verbose); 1269 1270 void do_klass(Klass* k); 1271 }; 1272 1273 /* JNIid class for jfieldIDs only */ 1274 class JNIid: public CHeapObj<mtClass> { 1275 friend class VMStructs; 1276 private: 1277 Klass* _holder; 1278 JNIid* _next; 1279 int _offset; 1280 #ifdef ASSERT 1281 bool _is_static_field_id; 1282 #endif 1283 1284 public: 1285 // Accessors 1286 Klass* holder() const { return _holder; } 1287 int offset() const { return _offset; } 1288 JNIid* next() { return _next; } 1289 // Constructor 1290 JNIid(Klass* holder, int offset, JNIid* next); 1291 // Identifier lookup 1292 JNIid* find(int offset); 1293 1294 bool find_local_field(fieldDescriptor* fd) { 1295 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1296 } 1297 1298 static void deallocate(JNIid* id); 1299 // Debugging 1300 #ifdef ASSERT 1301 bool is_static_field_id() const { return _is_static_field_id; } 1302 void set_is_static_field_id() { _is_static_field_id = true; } 1303 #endif 1304 void verify(Klass* holder); 1305 }; 1306 1307 // An iterator that's used to access the inner classes indices in the 1308 // InstanceKlass::_inner_classes array. 1309 class InnerClassesIterator : public StackObj { 1310 private: 1311 Array<jushort>* _inner_classes; 1312 int _length; 1313 int _idx; 1314 public: 1315 1316 InnerClassesIterator(const InstanceKlass* k) { 1317 _inner_classes = k->inner_classes(); 1318 if (k->inner_classes() != nullptr) { 1319 _length = _inner_classes->length(); 1320 // The inner class array's length should be the multiple of 1321 // inner_class_next_offset if it only contains the InnerClasses 1322 // attribute data, or it should be 1323 // n*inner_class_next_offset+enclosing_method_attribute_size 1324 // if it also contains the EnclosingMethod data. 1325 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1326 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1327 "just checking"); 1328 // Remove the enclosing_method portion if exists. 1329 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1330 _length -= InstanceKlass::enclosing_method_attribute_size; 1331 } 1332 } else { 1333 _length = 0; 1334 } 1335 _idx = 0; 1336 } 1337 1338 int length() const { 1339 return _length; 1340 } 1341 1342 void next() { 1343 _idx += InstanceKlass::inner_class_next_offset; 1344 } 1345 1346 bool done() const { 1347 return (_idx >= _length); 1348 } 1349 1350 u2 inner_class_info_index() const { 1351 return _inner_classes->at( 1352 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1353 } 1354 1355 void set_inner_class_info_index(u2 index) { 1356 _inner_classes->at_put( 1357 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1358 } 1359 1360 u2 outer_class_info_index() const { 1361 return _inner_classes->at( 1362 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1363 } 1364 1365 void set_outer_class_info_index(u2 index) { 1366 _inner_classes->at_put( 1367 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1368 } 1369 1370 u2 inner_name_index() const { 1371 return _inner_classes->at( 1372 _idx + InstanceKlass::inner_class_inner_name_offset); 1373 } 1374 1375 void set_inner_name_index(u2 index) { 1376 _inner_classes->at_put( 1377 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1378 } 1379 1380 u2 inner_access_flags() const { 1381 return _inner_classes->at( 1382 _idx + InstanceKlass::inner_class_access_flags_offset); 1383 } 1384 }; 1385 1386 // Iterator over class hierarchy under a particular class. Implements depth-first pre-order traversal. 1387 // Usage: 1388 // for (ClassHierarchyIterator iter(root_klass); !iter.done(); iter.next()) { 1389 // Klass* k = iter.klass(); 1390 // ... 1391 // } 1392 class ClassHierarchyIterator : public StackObj { 1393 private: 1394 InstanceKlass* _root; 1395 Klass* _current; 1396 bool _visit_subclasses; 1397 1398 public: 1399 ClassHierarchyIterator(InstanceKlass* root) : _root(root), _current(root), _visit_subclasses(true) { 1400 assert(_root == _current, "required"); // initial state 1401 } 1402 1403 bool done() { 1404 return (_current == nullptr); 1405 } 1406 1407 // Make a step iterating over the class hierarchy under the root class. 1408 // Skips subclasses if requested. 1409 void next(); 1410 1411 Klass* klass() { 1412 assert(!done(), "sanity"); 1413 return _current; 1414 } 1415 1416 // Skip subclasses of the current class. 1417 void skip_subclasses() { 1418 _visit_subclasses = false; 1419 } 1420 }; 1421 1422 #endif // SHARE_OOPS_INSTANCEKLASS_HPP