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