1 /* 2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_OOPS_INSTANCEKLASS_HPP 26 #define SHARE_OOPS_INSTANCEKLASS_HPP 27 28 #include "memory/allocation.hpp" 29 #include "memory/referenceType.hpp" 30 #include "oops/annotations.hpp" 31 #include "oops/constMethod.hpp" 32 #include "oops/fieldInfo.hpp" 33 #include "oops/instanceKlassFlags.hpp" 34 #include "oops/instanceOop.hpp" 35 #include "runtime/handles.hpp" 36 #include "runtime/javaThread.hpp" 37 #include "utilities/accessFlags.hpp" 38 #include "utilities/align.hpp" 39 #include "utilities/growableArray.hpp" 40 #include "utilities/macros.hpp" 41 #if INCLUDE_JFR 42 #include "jfr/support/jfrKlassExtension.hpp" 43 #endif 44 45 class ConstantPool; 46 class DeoptimizationScope; 47 class klassItable; 48 class RecordComponent; 49 50 // An InstanceKlass is the VM level representation of a Java class. 51 // It contains all information needed for at class at execution runtime. 52 53 // InstanceKlass embedded field layout (after declared fields): 54 // [EMBEDDED Java vtable ] size in words = vtable_len 55 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size 56 // The embedded nonstatic oop-map blocks are short pairs (offset, length) 57 // indicating where oops are located in instances of this klass. 58 // [EMBEDDED implementor of the interface] only exist for interface 59 60 61 // forward declaration for class -- see below for definition 62 #if INCLUDE_JVMTI 63 class BreakpointInfo; 64 #endif 65 class ClassFileParser; 66 class ClassFileStream; 67 class KlassDepChange; 68 class DependencyContext; 69 class fieldDescriptor; 70 class JNIid; 71 class JvmtiCachedClassFieldMap; 72 class nmethodBucket; 73 class OopMapCache; 74 class InterpreterOopMap; 75 class PackageEntry; 76 class ModuleEntry; 77 78 // This is used in iterators below. 79 class FieldClosure: public StackObj { 80 public: 81 virtual void do_field(fieldDescriptor* fd) = 0; 82 }; 83 84 // Print fields. 85 // If "obj" argument to constructor is null, prints static fields, otherwise prints non-static fields. 86 class FieldPrinter: public FieldClosure { 87 oop _obj; 88 outputStream* _st; 89 public: 90 FieldPrinter(outputStream* st, oop obj = nullptr) : _obj(obj), _st(st) {} 91 void do_field(fieldDescriptor* fd); 92 }; 93 94 // Describes where oops are located in instances of this klass. 95 class OopMapBlock { 96 public: 97 // Byte offset of the first oop mapped by this block. 98 int offset() const { return _offset; } 99 void set_offset(int offset) { _offset = offset; } 100 101 // Number of oops in this block. 102 uint count() const { return _count; } 103 void set_count(uint count) { _count = count; } 104 105 void increment_count(int diff) { _count += diff; } 106 107 int offset_span() const { return _count * heapOopSize; } 108 109 int end_offset() const { 110 return offset() + offset_span(); 111 } 112 113 bool is_contiguous(int another_offset) const { 114 return another_offset == end_offset(); 115 } 116 117 // sizeof(OopMapBlock) in words. 118 static int size_in_words() { 119 return align_up((int)sizeof(OopMapBlock), wordSize) >> 120 LogBytesPerWord; 121 } 122 123 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) { 124 return a->offset() - b->offset(); 125 } 126 127 private: 128 int _offset; 129 uint _count; 130 }; 131 132 struct JvmtiCachedClassFileData; 133 134 class InstanceKlass: public Klass { 135 friend class VMStructs; 136 friend class JVMCIVMStructs; 137 friend class ClassFileParser; 138 friend class CompileReplay; 139 140 public: 141 static const KlassKind Kind = InstanceKlassKind; 142 143 protected: 144 InstanceKlass(const ClassFileParser& parser, KlassKind kind = Kind, ReferenceType reference_type = REF_NONE); 145 146 void* operator new(size_t size, ClassLoaderData* loader_data, size_t word_size, bool use_class_space, TRAPS) throw(); 147 148 public: 149 InstanceKlass(); 150 151 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 152 // of the class loading & initialization procedure, and the use of the states. 153 enum ClassState : u1 { 154 allocated, // allocated (but not yet linked) 155 loaded, // loaded and inserted in class hierarchy (but not linked yet) 156 linked, // successfully linked/verified (but not initialized yet) 157 being_initialized, // currently running class initializer 158 fully_initialized, // initialized (successful final state) 159 initialization_error // error happened during initialization 160 }; 161 162 private: 163 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS); 164 165 protected: 166 // If you add a new field that points to any metaspace object, you 167 // must add this field to InstanceKlass::metaspace_pointers_do(). 168 169 // Annotations for this class 170 Annotations* _annotations; 171 // Package this class is defined in 172 PackageEntry* _package_entry; 173 // Array classes holding elements of this class. 174 ObjArrayKlass* volatile _array_klasses; 175 // Constant pool for this class. 176 ConstantPool* _constants; 177 // The InnerClasses attribute and EnclosingMethod attribute. The 178 // _inner_classes is an array of shorts. If the class has InnerClasses 179 // attribute, then the _inner_classes array begins with 4-tuples of shorts 180 // [inner_class_info_index, outer_class_info_index, 181 // inner_name_index, inner_class_access_flags] for the InnerClasses 182 // attribute. If the EnclosingMethod attribute exists, it occupies the 183 // last two shorts [class_index, method_index] of the array. If only 184 // the InnerClasses attribute exists, the _inner_classes array length is 185 // number_of_inner_classes * 4. If the class has both InnerClasses 186 // and EnclosingMethod attributes the _inner_classes array length is 187 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 188 Array<jushort>* _inner_classes; 189 190 // The NestMembers attribute. An array of shorts, where each is a 191 // class info index for the class that is a nest member. This data 192 // has not been validated. 193 Array<jushort>* _nest_members; 194 195 // Resolved nest-host klass: either true nest-host or self if we are not 196 // nested, or an error occurred resolving or validating the nominated 197 // nest-host. Can also be set directly by JDK API's that establish nest 198 // relationships. 199 // By always being set it makes nest-member access checks simpler. 200 InstanceKlass* _nest_host; 201 202 // The PermittedSubclasses attribute. An array of shorts, where each is a 203 // class info index for the class that is a permitted subclass. 204 Array<jushort>* _permitted_subclasses; 205 206 // The contents of the Record attribute. 207 Array<RecordComponent*>* _record_components; 208 209 // the source debug extension for this klass, null if not specified. 210 // Specified as UTF-8 string without terminating zero byte in the classfile, 211 // it is stored in the instanceklass as a null-terminated UTF-8 string 212 const char* _source_debug_extension; 213 214 // Number of heapOopSize words used by non-static fields in this klass 215 // (including inherited fields but after header_size()). 216 int _nonstatic_field_size; 217 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 218 int _nonstatic_oop_map_size; // size in words of nonstatic oop map blocks 219 int _itable_len; // length of Java itable (in words) 220 221 // The NestHost attribute. The class info index for the class 222 // that is the nest-host of this class. This data has not been validated. 223 u2 _nest_host_index; 224 u2 _this_class_index; // constant pool entry 225 u2 _static_oop_field_count; // number of static oop fields in this klass 226 227 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 228 229 // Class states are defined as ClassState (see above). 230 // Place the _init_state here to utilize the unused 2-byte after 231 // _idnum_allocated_count. 232 volatile ClassState _init_state; // state of class 233 234 u1 _reference_type; // reference type 235 236 // State is set either at parse time or while executing, atomically to not disturb other state 237 InstanceKlassFlags _misc_flags; 238 239 JavaThread* volatile _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization) 240 241 int _hash_offset; // Offset of hidden field for i-hash 242 243 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 244 JNIid* _jni_ids; // First JNI identifier for static fields in this class 245 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or null if none 246 nmethodBucket* volatile _dep_context; // packed DependencyContext structure 247 uint64_t volatile _dep_context_last_cleaned; 248 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 249 #if INCLUDE_JVMTI 250 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 251 // Linked instanceKlasses of previous versions 252 InstanceKlass* _previous_versions; 253 // JVMTI fields can be moved to their own structure - see 6315920 254 // JVMTI: cached class file, before retransformable agent modified it in CFLH 255 JvmtiCachedClassFileData* _cached_class_file; 256 #endif 257 258 #if INCLUDE_JVMTI 259 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 260 #endif 261 262 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 263 NOT_PRODUCT(volatile int _shared_class_load_count;) // ensure a shared class is loaded only once 264 265 // Method array. 266 Array<Method*>* _methods; 267 // Default Method Array, concrete methods inherited from interfaces 268 Array<Method*>* _default_methods; 269 // Interfaces (InstanceKlass*s) this class declares locally to implement. 270 Array<InstanceKlass*>* _local_interfaces; 271 // Interfaces (InstanceKlass*s) this class implements transitively. 272 Array<InstanceKlass*>* _transitive_interfaces; 273 // Int array containing the original order of method in the class file (for JVMTI). 274 Array<int>* _method_ordering; 275 // Int array containing the vtable_indices for default_methods 276 // offset matches _default_methods offset 277 Array<int>* _default_vtable_indices; 278 279 // Fields information is stored in an UNSIGNED5 encoded stream (see fieldInfo.hpp) 280 Array<u1>* _fieldinfo_stream; 281 Array<u1>* _fieldinfo_search_table; 282 Array<FieldStatus>* _fields_status; 283 284 // embedded Java vtable follows here 285 // embedded Java itables follows here 286 // embedded static fields follows here 287 // embedded nonstatic oop-map blocks follows here 288 // embedded implementor of this interface follows here 289 // The embedded implementor only exists if the current klass is an 290 // interface. The possible values of the implementor fall into following 291 // three cases: 292 // null: no implementor. 293 // A Klass* that's not itself: one implementor. 294 // Itself: more than one implementors. 295 // 296 297 friend class SystemDictionary; 298 299 static bool _disable_method_binary_search; 300 301 // Controls finalizer registration 302 static bool _finalization_enabled; 303 304 public: 305 306 // Queries finalization state 307 static bool is_finalization_enabled() { return _finalization_enabled; } 308 309 // Sets finalization state 310 static void set_finalization_enabled(bool val) { _finalization_enabled = val; } 311 312 // Quick checks for the loader that defined this class (without switching on this->class_loader()) 313 bool defined_by_boot_loader() const { return _misc_flags.defined_by_boot_loader(); } 314 bool defined_by_platform_loader() const { return _misc_flags.defined_by_platform_loader(); } 315 bool defined_by_app_loader() const { return _misc_flags.defined_by_app_loader(); } 316 bool defined_by_other_loaders() const { return _misc_flags.defined_by_other_loaders(); } 317 void set_class_loader_type() { _misc_flags.set_class_loader_type(_class_loader_data); } 318 319 // Check if the class can be shared in CDS 320 bool is_shareable() const; 321 322 bool shared_loading_failed() const { return _misc_flags.shared_loading_failed(); } 323 324 void set_shared_loading_failed() { _misc_flags.set_shared_loading_failed(true); } 325 326 bool has_nonstatic_fields() const { return _misc_flags.has_nonstatic_fields(); } 327 void set_has_nonstatic_fields(bool b) { _misc_flags.set_has_nonstatic_fields(b); } 328 329 bool has_localvariable_table() const { return _misc_flags.has_localvariable_table(); } 330 void set_has_localvariable_table(bool b) { _misc_flags.set_has_localvariable_table(b); } 331 332 // field sizes 333 int nonstatic_field_size() const { return _nonstatic_field_size; } 334 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 335 336 int static_field_size() const { return _static_field_size; } 337 void set_static_field_size(int size) { _static_field_size = size; } 338 339 int static_oop_field_count() const { return (int)_static_oop_field_count; } 340 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 341 342 // Java itable 343 int itable_length() const { return _itable_len; } 344 void set_itable_length(int len) { _itable_len = len; } 345 346 // array klasses 347 ObjArrayKlass* array_klasses() const { return _array_klasses; } 348 inline ObjArrayKlass* array_klasses_acquire() const; // load with acquire semantics 349 inline void release_set_array_klasses(ObjArrayKlass* k); // store with release semantics 350 void set_array_klasses(ObjArrayKlass* k) { _array_klasses = k; } 351 352 // methods 353 Array<Method*>* methods() const { return _methods; } 354 void set_methods(Array<Method*>* a) { _methods = a; } 355 Method* method_with_idnum(int idnum) const; 356 Method* method_with_orig_idnum(int idnum) const; 357 Method* method_with_orig_idnum(int idnum, int version) const; 358 359 // method ordering 360 Array<int>* method_ordering() const { return _method_ordering; } 361 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 362 void copy_method_ordering(const intArray* m, TRAPS); 363 364 // default_methods 365 Array<Method*>* default_methods() const { return _default_methods; } 366 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 367 368 // default method vtable_indices 369 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 370 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 371 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 372 373 // interfaces 374 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; } 375 void set_local_interfaces(Array<InstanceKlass*>* a) { 376 guarantee(_local_interfaces == nullptr || a == nullptr, "Just checking"); 377 _local_interfaces = a; } 378 379 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; } 380 void set_transitive_interfaces(Array<InstanceKlass*>* a) { 381 guarantee(_transitive_interfaces == nullptr || a == nullptr, "Just checking"); 382 _transitive_interfaces = a; 383 } 384 385 private: 386 friend class fieldDescriptor; 387 FieldInfo field(int index) const; 388 389 public: 390 int field_offset (int index) const { return field(index).offset(); } 391 int field_access_flags(int index) const { return field(index).access_flags().as_field_flags(); } 392 FieldInfo::FieldFlags field_flags(int index) const { return field(index).field_flags(); } 393 FieldStatus field_status(int index) const { return fields_status()->at(index); } 394 inline Symbol* field_name (int index) const; 395 inline Symbol* field_signature (int index) const; 396 397 // Number of Java declared fields 398 int java_fields_count() const; 399 int total_fields_count() const; 400 401 Array<u1>* fieldinfo_stream() const { return _fieldinfo_stream; } 402 void set_fieldinfo_stream(Array<u1>* fis) { _fieldinfo_stream = fis; } 403 404 Array<u1>* fieldinfo_search_table() const { return _fieldinfo_search_table; } 405 void set_fieldinfo_search_table(Array<u1>* table) { _fieldinfo_search_table = table; } 406 407 Array<FieldStatus>* fields_status() const {return _fields_status; } 408 void set_fields_status(Array<FieldStatus>* array) { _fields_status = array; } 409 410 // inner classes 411 Array<u2>* inner_classes() const { return _inner_classes; } 412 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 413 414 // nest members 415 Array<u2>* nest_members() const { return _nest_members; } 416 void set_nest_members(Array<u2>* m) { _nest_members = m; } 417 418 // nest-host index 419 jushort nest_host_index() const { return _nest_host_index; } 420 void set_nest_host_index(u2 i) { _nest_host_index = i; } 421 // dynamic nest member support 422 void set_nest_host(InstanceKlass* host); 423 424 // record components 425 Array<RecordComponent*>* record_components() const { return _record_components; } 426 void set_record_components(Array<RecordComponent*>* record_components) { 427 _record_components = record_components; 428 } 429 bool is_record() const; 430 431 // test for enum class (or possibly an anonymous subclass within a sealed enum) 432 bool is_enum_subclass() const; 433 434 // permitted subclasses 435 Array<u2>* permitted_subclasses() const { return _permitted_subclasses; } 436 void set_permitted_subclasses(Array<u2>* s) { _permitted_subclasses = s; } 437 438 private: 439 // Called to verify that k is a member of this nest - does not look at k's nest-host, 440 // nor does it resolve any CP entries or load any classes. 441 bool has_nest_member(JavaThread* current, InstanceKlass* k) const; 442 443 public: 444 // Call this only if you know that the nest host has been initialized. 445 InstanceKlass* nest_host_not_null() { 446 assert(_nest_host != nullptr, "must be"); 447 return _nest_host; 448 } 449 InstanceKlass* nest_host_or_null() { 450 return _nest_host; 451 } 452 // Used to construct informative IllegalAccessError messages at a higher level, 453 // if there was an issue resolving or validating the nest host. 454 // Returns null if there was no error. 455 const char* nest_host_error(); 456 // Returns nest-host class, resolving and validating it if needed. 457 // Returns null if resolution is not possible from the calling context. 458 InstanceKlass* nest_host(TRAPS); 459 // Check if this klass is a nestmate of k - resolves this nest-host and k's 460 bool has_nestmate_access_to(InstanceKlass* k, TRAPS); 461 462 // Called to verify that k is a permitted subclass of this class. 463 // The incoming stringStream is used for logging, and for the caller to create 464 // a detailed exception message on failure. 465 bool has_as_permitted_subclass(const InstanceKlass* k, stringStream& ss) const; 466 467 enum InnerClassAttributeOffset { 468 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 469 inner_class_inner_class_info_offset = 0, 470 inner_class_outer_class_info_offset = 1, 471 inner_class_inner_name_offset = 2, 472 inner_class_access_flags_offset = 3, 473 inner_class_next_offset = 4 474 }; 475 476 enum EnclosingMethodAttributeOffset { 477 enclosing_method_class_index_offset = 0, 478 enclosing_method_method_index_offset = 1, 479 enclosing_method_attribute_size = 2 480 }; 481 482 // package 483 PackageEntry* package() const { return _package_entry; } 484 ModuleEntry* module() const; 485 bool in_javabase_module() const; 486 bool in_unnamed_package() const { return (_package_entry == nullptr); } 487 void set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS); 488 // If the package for the InstanceKlass is in the boot loader's package entry 489 // table then sets the classpath_index field so that 490 // get_system_package() will know to return a non-null value for the 491 // package's location. And, so that the package will be added to the list of 492 // packages returned by get_system_packages(). 493 // For packages whose classes are loaded from the boot loader class path, the 494 // classpath_index indicates which entry on the boot loader class path. 495 void set_classpath_index(s2 path_index); 496 bool is_same_class_package(const Klass* class2) const; 497 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const; 498 499 // find an enclosing class 500 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 501 502 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 503 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 504 505 private: 506 // Check prohibited package ("java/" only loadable by boot or platform loaders) 507 static void check_prohibited_package(Symbol* class_name, 508 ClassLoaderData* loader_data, 509 TRAPS); 510 511 JavaThread* init_thread() { return Atomic::load(&_init_thread); } 512 const char* init_thread_name() { 513 return init_thread()->name_raw(); 514 } 515 516 public: 517 // initialization state 518 bool is_loaded() const { return init_state() >= loaded; } 519 bool is_linked() const { return init_state() >= linked; } 520 bool is_initialized() const { return init_state() == fully_initialized; } 521 bool is_not_initialized() const { return init_state() < being_initialized; } 522 bool is_being_initialized() const { return init_state() == being_initialized; } 523 bool is_in_error_state() const { return init_state() == initialization_error; } 524 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 525 ClassState init_state() const { return Atomic::load_acquire(&_init_state); } 526 const char* init_state_name() const; 527 bool is_rewritten() const { return _misc_flags.rewritten(); } 528 529 // is this a sealed class 530 bool is_sealed() const; 531 532 // defineClass specified verification 533 bool should_verify_class() const { return _misc_flags.should_verify_class(); } 534 void set_should_verify_class(bool value) { _misc_flags.set_should_verify_class(value); } 535 536 // marking 537 bool is_marked_dependent() const { return _misc_flags.is_marked_dependent(); } 538 void set_is_marked_dependent(bool value) { _misc_flags.set_is_marked_dependent(value); } 539 540 // initialization (virtuals from Klass) 541 bool should_be_initialized() const; // means that initialize should be called 542 void initialize_with_aot_initialized_mirror(TRAPS); 543 void assert_no_clinit_will_run_for_aot_initialized_class() const NOT_DEBUG_RETURN; 544 void initialize(TRAPS); 545 void link_class(TRAPS); 546 bool link_class_or_fail(TRAPS); // returns false on failure 547 void rewrite_class(TRAPS); 548 void link_methods(TRAPS); 549 Method* class_initializer() const; 550 bool interface_needs_clinit_execution_as_super(bool also_check_supers=true) const; 551 552 // reference type 553 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 554 555 // this class cp index 556 u2 this_class_index() const { return _this_class_index; } 557 void set_this_class_index(u2 index) { _this_class_index = index; } 558 559 static ByteSize reference_type_offset() { return byte_offset_of(InstanceKlass, _reference_type); } 560 561 // find local field, returns true if found 562 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 563 // find field in direct superinterfaces, returns the interface in which the field is defined 564 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 565 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 566 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 567 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 568 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 569 570 // find a non-static or static field given its offset within the class. 571 bool contains_field_offset(int offset); 572 573 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 574 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 575 576 private: 577 inline static int quick_search(const Array<Method*>* methods, const Symbol* name); 578 579 public: 580 static void disable_method_binary_search() { 581 _disable_method_binary_search = true; 582 } 583 584 // find a local method (returns null if not found) 585 Method* find_method(const Symbol* name, const Symbol* signature) const; 586 static Method* find_method(const Array<Method*>* methods, 587 const Symbol* name, 588 const Symbol* signature); 589 590 // find a local method, but skip static methods 591 Method* find_instance_method(const Symbol* name, const Symbol* signature, 592 PrivateLookupMode private_mode) const; 593 static Method* find_instance_method(const Array<Method*>* methods, 594 const Symbol* name, 595 const Symbol* signature, 596 PrivateLookupMode private_mode); 597 598 // find a local method (returns null if not found) 599 Method* find_local_method(const Symbol* name, 600 const Symbol* signature, 601 OverpassLookupMode overpass_mode, 602 StaticLookupMode static_mode, 603 PrivateLookupMode private_mode) const; 604 605 // find a local method from given methods array (returns null if not found) 606 static Method* find_local_method(const Array<Method*>* methods, 607 const Symbol* name, 608 const Symbol* signature, 609 OverpassLookupMode overpass_mode, 610 StaticLookupMode static_mode, 611 PrivateLookupMode private_mode); 612 613 // find a local method index in methods or default_methods (returns -1 if not found) 614 static int find_method_index(const Array<Method*>* methods, 615 const Symbol* name, 616 const Symbol* signature, 617 OverpassLookupMode overpass_mode, 618 StaticLookupMode static_mode, 619 PrivateLookupMode private_mode); 620 621 // lookup operation (returns null if not found) 622 Method* uncached_lookup_method(const Symbol* name, 623 const Symbol* signature, 624 OverpassLookupMode overpass_mode, 625 PrivateLookupMode private_mode = PrivateLookupMode::find) const; 626 627 // lookup a method in all the interfaces that this class implements 628 // (returns null if not found) 629 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 630 631 // lookup a method in local defaults then in all interfaces 632 // (returns null if not found) 633 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 634 635 // Find method indices by name. If a method with the specified name is 636 // found the index to the first method is returned, and 'end' is filled in 637 // with the index of first non-name-matching method. If no method is found 638 // -1 is returned. 639 int find_method_by_name(const Symbol* name, int* end) const; 640 static int find_method_by_name(const Array<Method*>* methods, 641 const Symbol* name, int* end); 642 643 // constant pool 644 ConstantPool* constants() const { return _constants; } 645 void set_constants(ConstantPool* c) { _constants = c; } 646 647 // protection domain 648 oop protection_domain() const; 649 650 // signers 651 objArrayOop signers() const; 652 653 bool is_contended() const { return _misc_flags.is_contended(); } 654 void set_is_contended(bool value) { _misc_flags.set_is_contended(value); } 655 656 // source file name 657 Symbol* source_file_name() const; 658 u2 source_file_name_index() const; 659 void set_source_file_name_index(u2 sourcefile_index); 660 661 // minor and major version numbers of class file 662 u2 minor_version() const; 663 void set_minor_version(u2 minor_version); 664 u2 major_version() const; 665 void set_major_version(u2 major_version); 666 667 // source debug extension 668 const char* source_debug_extension() const { return _source_debug_extension; } 669 void set_source_debug_extension(const char* array, int length); 670 671 // nonstatic oop-map blocks 672 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 673 return oop_map_count * OopMapBlock::size_in_words(); 674 } 675 unsigned int nonstatic_oop_map_count() const { 676 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 677 } 678 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 679 void set_nonstatic_oop_map_size(int words) { 680 _nonstatic_oop_map_size = words; 681 } 682 683 bool has_contended_annotations() const { return _misc_flags.has_contended_annotations(); } 684 void set_has_contended_annotations(bool value) { _misc_flags.set_has_contended_annotations(value); } 685 686 #if INCLUDE_JVMTI 687 // Redefinition locking. Class can only be redefined by one thread at a time. 688 bool is_being_redefined() const { return _misc_flags.is_being_redefined(); } 689 void set_is_being_redefined(bool value) { _misc_flags.set_is_being_redefined(value); } 690 691 // RedefineClasses() support for previous versions: 692 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 693 void purge_previous_version_list(); 694 695 InstanceKlass* previous_versions() const { return _previous_versions; } 696 #else 697 InstanceKlass* previous_versions() const { return nullptr; } 698 #endif 699 700 const InstanceKlass* get_klass_version(int version) const; 701 702 bool has_been_redefined() const { return _misc_flags.has_been_redefined(); } 703 void set_has_been_redefined() { _misc_flags.set_has_been_redefined(true); } 704 705 bool is_scratch_class() const { return _misc_flags.is_scratch_class(); } 706 void set_is_scratch_class() { _misc_flags.set_is_scratch_class(true); } 707 708 bool has_resolved_methods() const { return _misc_flags.has_resolved_methods(); } 709 void set_has_resolved_methods() { _misc_flags.set_has_resolved_methods(true); } 710 void set_has_resolved_methods(bool value) { _misc_flags.set_has_resolved_methods(value); } 711 712 public: 713 #if INCLUDE_JVMTI 714 715 void init_previous_versions() { 716 _previous_versions = nullptr; 717 } 718 719 private: 720 static bool _should_clean_previous_versions; 721 public: 722 static void purge_previous_versions(InstanceKlass* ik) { 723 if (ik->has_been_redefined()) { 724 ik->purge_previous_version_list(); 725 } 726 } 727 728 static bool should_clean_previous_versions_and_reset(); 729 static bool should_clean_previous_versions() { return _should_clean_previous_versions; } 730 731 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 732 void set_cached_class_file(JvmtiCachedClassFileData *data) { 733 _cached_class_file = data; 734 } 735 JvmtiCachedClassFileData * get_cached_class_file(); 736 jint get_cached_class_file_len(); 737 unsigned char * get_cached_class_file_bytes(); 738 739 // JVMTI: Support for caching of field indices, types, and offsets 740 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 741 _jvmti_cached_class_field_map = descriptor; 742 } 743 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 744 return _jvmti_cached_class_field_map; 745 } 746 #else // INCLUDE_JVMTI 747 748 static void purge_previous_versions(InstanceKlass* ik) { return; }; 749 static bool should_clean_previous_versions_and_reset() { return false; } 750 751 void set_cached_class_file(JvmtiCachedClassFileData *data) { 752 assert(data == nullptr, "unexpected call with JVMTI disabled"); 753 } 754 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)nullptr; } 755 756 #endif // INCLUDE_JVMTI 757 758 bool has_nonstatic_concrete_methods() const { return _misc_flags.has_nonstatic_concrete_methods(); } 759 void set_has_nonstatic_concrete_methods(bool b) { _misc_flags.set_has_nonstatic_concrete_methods(b); } 760 761 bool declares_nonstatic_concrete_methods() const { return _misc_flags.declares_nonstatic_concrete_methods(); } 762 void set_declares_nonstatic_concrete_methods(bool b) { _misc_flags.set_declares_nonstatic_concrete_methods(b); } 763 764 bool has_miranda_methods () const { return _misc_flags.has_miranda_methods(); } 765 void set_has_miranda_methods() { _misc_flags.set_has_miranda_methods(true); } 766 bool has_final_method() const { return _misc_flags.has_final_method(); } 767 void set_has_final_method() { _misc_flags.set_has_final_method(true); } 768 769 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 770 inline u2 next_method_idnum(); 771 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 772 773 // generics support 774 Symbol* generic_signature() const; 775 u2 generic_signature_index() const; 776 void set_generic_signature_index(u2 sig_index); 777 778 u2 enclosing_method_data(int offset) const; 779 u2 enclosing_method_class_index() const { 780 return enclosing_method_data(enclosing_method_class_index_offset); 781 } 782 u2 enclosing_method_method_index() { 783 return enclosing_method_data(enclosing_method_method_index_offset); 784 } 785 void set_enclosing_method_indices(u2 class_index, 786 u2 method_index); 787 788 // jmethodID support 789 jmethodID get_jmethod_id(Method* method); 790 void make_methods_jmethod_ids(); 791 jmethodID jmethod_id_or_null(Method* method); 792 void update_methods_jmethod_cache(); 793 794 // annotations support 795 Annotations* annotations() const { return _annotations; } 796 void set_annotations(Annotations* anno) { _annotations = anno; } 797 798 AnnotationArray* class_annotations() const { 799 return (_annotations != nullptr) ? _annotations->class_annotations() : nullptr; 800 } 801 Array<AnnotationArray*>* fields_annotations() const { 802 return (_annotations != nullptr) ? _annotations->fields_annotations() : nullptr; 803 } 804 AnnotationArray* class_type_annotations() const { 805 return (_annotations != nullptr) ? _annotations->class_type_annotations() : nullptr; 806 } 807 Array<AnnotationArray*>* fields_type_annotations() const { 808 return (_annotations != nullptr) ? _annotations->fields_type_annotations() : nullptr; 809 } 810 // allocation 811 instanceOop allocate_instance(TRAPS); 812 static instanceOop allocate_instance(oop cls, TRAPS); 813 814 // additional member function to return a handle 815 instanceHandle allocate_instance_handle(TRAPS); 816 817 objArrayOop allocate_objArray(int n, int length, TRAPS); 818 // Helper function 819 static instanceOop register_finalizer(instanceOop i, TRAPS); 820 821 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 822 // if not, throw either an Error or an Exception. 823 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 824 825 // initialization 826 void call_class_initializer(TRAPS); 827 void set_initialization_state_and_notify(ClassState state, TRAPS); 828 829 // OopMapCache support 830 OopMapCache* oop_map_cache() { return _oop_map_cache; } 831 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 832 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 833 834 // JNI identifier support (for static fields - for jni performance) 835 JNIid* jni_ids() { return _jni_ids; } 836 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 837 JNIid* jni_id_for(int offset); 838 839 public: 840 // maintenance of deoptimization dependencies 841 inline DependencyContext dependencies(); 842 void mark_dependent_nmethods(DeoptimizationScope* deopt_scope, KlassDepChange& changes); 843 void add_dependent_nmethod(nmethod* nm); 844 void clean_dependency_context(); 845 // Setup link to hierarchy and deoptimize 846 void add_to_hierarchy(JavaThread* current); 847 848 // On-stack replacement support 849 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 850 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 851 void add_osr_nmethod(nmethod* n); 852 bool remove_osr_nmethod(nmethod* n); 853 int mark_osr_nmethods(DeoptimizationScope* deopt_scope, const Method* m); 854 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 855 856 #if INCLUDE_JVMTI 857 // Breakpoint support (see methods on Method* for details) 858 BreakpointInfo* breakpoints() const { return _breakpoints; }; 859 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 860 #endif 861 862 // support for stub routines 863 static ByteSize init_state_offset() { return byte_offset_of(InstanceKlass, _init_state); } 864 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;) 865 static ByteSize init_thread_offset() { return byte_offset_of(InstanceKlass, _init_thread); } 866 867 // subclass/subinterface checks 868 bool implements_interface(Klass* k) const; 869 bool is_same_or_direct_interface(Klass* k) const; 870 871 #ifdef ASSERT 872 // check whether this class or one of its superclasses was redefined 873 bool has_redefined_this_or_super() const; 874 #endif 875 876 // Access to the implementor of an interface. 877 InstanceKlass* implementor() const; 878 void set_implementor(InstanceKlass* ik); 879 int nof_implementors() const; 880 void add_implementor(InstanceKlass* ik); // ik is a new class that implements this interface 881 void init_implementor(); // initialize 882 883 private: 884 // link this class into the implementors list of every interface it implements 885 void process_interfaces(); 886 887 public: 888 // virtual operations from Klass 889 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 890 Array<InstanceKlass*>* transitive_interfaces); 891 bool can_be_primary_super_slow() const; 892 size_t oop_size(oop obj, markWord mark) const { return size_helper(); } 893 // slow because it's a virtual call and used for verifying the layout_helper. 894 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 895 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 896 897 // Iterators 898 void do_local_static_fields(FieldClosure* cl); 899 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 900 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 901 void print_nonstatic_fields(FieldClosure* cl); // including inherited and injected fields 902 903 void methods_do(void f(Method* method)); 904 905 static InstanceKlass* cast(Klass* k) { 906 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 907 } 908 909 static const InstanceKlass* cast(const Klass* k) { 910 assert(k != nullptr, "k should not be null"); 911 assert(k->is_instance_klass(), "cast to InstanceKlass"); 912 return static_cast<const InstanceKlass*>(k); 913 } 914 915 virtual InstanceKlass* java_super() const { 916 return (super() == nullptr) ? nullptr : cast(super()); 917 } 918 919 // Sizing (in words) 920 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 921 922 static int size(int vtable_length, int itable_length, 923 int nonstatic_oop_map_size, 924 bool is_interface) { 925 return align_metadata_size(header_size() + 926 vtable_length + 927 itable_length + 928 nonstatic_oop_map_size + 929 (is_interface ? (int)sizeof(Klass*)/wordSize : 0)); 930 } 931 932 int size() const { return size(vtable_length(), 933 itable_length(), 934 nonstatic_oop_map_size(), 935 is_interface()); 936 } 937 938 939 inline intptr_t* start_of_itable() const; 940 inline intptr_t* end_of_itable() const; 941 inline oop static_field_base_raw(); 942 943 inline OopMapBlock* start_of_nonstatic_oop_maps() const; 944 inline Klass** end_of_nonstatic_oop_maps() const; 945 946 inline InstanceKlass* volatile* adr_implementor() const; 947 948 // Use this to return the size of an instance in heap words: 949 int size_helper() const { 950 return layout_helper_to_size_helper(layout_helper()); 951 } 952 953 virtual int hash_offset_in_bytes(oop obj, markWord m) const { 954 assert(UseCompactObjectHeaders, "only with compact i-hash"); 955 return _hash_offset; 956 } 957 static int hash_offset_offset_in_bytes() { 958 assert(UseCompactObjectHeaders, "only with compact i-hash"); 959 return (int)offset_of(InstanceKlass, _hash_offset); 960 } 961 962 // This bit is initialized in classFileParser.cpp. 963 // It is false under any of the following conditions: 964 // - the class is abstract (including any interface) 965 // - the class size is larger than FastAllocateSizeLimit 966 // - the class is java/lang/Class, which cannot be allocated directly 967 bool can_be_fastpath_allocated() const { 968 return !layout_helper_needs_slow_path(layout_helper()); 969 } 970 971 // Java itable 972 klassItable itable() const; // return klassItable wrapper 973 Method* method_at_itable(InstanceKlass* holder, int index, TRAPS); 974 Method* method_at_itable_or_null(InstanceKlass* holder, int index, bool& itable_entry_found); 975 int vtable_index_of_interface_method(Method* method); 976 977 #if INCLUDE_JVMTI 978 void adjust_default_methods(bool* trace_name_printed); 979 #endif // INCLUDE_JVMTI 980 981 void clean_weak_instanceklass_links(); 982 private: 983 void clean_implementors_list(); 984 void clean_method_data(); 985 986 public: 987 // Explicit metaspace deallocation of fields 988 // For RedefineClasses and class file parsing errors, we need to deallocate 989 // instanceKlasses and the metadata they point to. 990 void deallocate_contents(ClassLoaderData* loader_data); 991 static void deallocate_methods(ClassLoaderData* loader_data, 992 Array<Method*>* methods); 993 void static deallocate_interfaces(ClassLoaderData* loader_data, 994 const Klass* super_klass, 995 Array<InstanceKlass*>* local_interfaces, 996 Array<InstanceKlass*>* transitive_interfaces); 997 void static deallocate_record_components(ClassLoaderData* loader_data, 998 Array<RecordComponent*>* record_component); 999 1000 virtual bool on_stack() const; 1001 1002 // callbacks for actions during class unloading 1003 static void unload_class(InstanceKlass* ik); 1004 1005 virtual void release_C_heap_structures(bool release_sub_metadata = true); 1006 1007 // Naming 1008 const char* signature_name() const; 1009 1010 // Oop fields (and metadata) iterators 1011 // 1012 // The InstanceKlass iterators also visits the Object's klass. 1013 1014 // Forward iteration 1015 public: 1016 // Iterate over all oop fields in the oop maps. 1017 template <typename T, class OopClosureType> 1018 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1019 1020 // Iterate over all oop fields and metadata. 1021 template <typename T, class OopClosureType> 1022 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 1023 1024 // Iterate over all oop fields in one oop map. 1025 template <typename T, class OopClosureType> 1026 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1027 1028 1029 // Reverse iteration 1030 // Iterate over all oop fields and metadata. 1031 template <typename T, class OopClosureType> 1032 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1033 1034 private: 1035 // Iterate over all oop fields in the oop maps. 1036 template <typename T, class OopClosureType> 1037 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1038 1039 // Iterate over all oop fields in one oop map. 1040 template <typename T, class OopClosureType> 1041 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1042 1043 1044 // Bounded range iteration 1045 public: 1046 // Iterate over all oop fields in the oop maps. 1047 template <typename T, class OopClosureType> 1048 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1049 1050 // Iterate over all oop fields and metadata. 1051 template <typename T, class OopClosureType> 1052 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1053 1054 private: 1055 // Iterate over all oop fields in one oop map. 1056 template <typename T, class OopClosureType> 1057 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1058 1059 1060 public: 1061 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1062 1063 private: 1064 // initialization state 1065 void set_init_state(ClassState state); 1066 void set_rewritten() { _misc_flags.set_rewritten(true); } 1067 void set_init_thread(JavaThread *thread) { 1068 assert((thread == JavaThread::current() && _init_thread == nullptr) || 1069 (thread == nullptr && _init_thread == JavaThread::current()), "Only one thread is allowed to own initialization"); 1070 Atomic::store(&_init_thread, thread); 1071 } 1072 1073 jmethodID* methods_jmethod_ids_acquire() const; 1074 void release_set_methods_jmethod_ids(jmethodID* jmeths); 1075 // This nulls out obsolete jmethodIDs for all methods in 'klass'. 1076 static void clear_obsolete_jmethod_ids(InstanceKlass* klass); 1077 jmethodID update_jmethod_id(jmethodID* jmeths, Method* method, int idnum); 1078 1079 public: 1080 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1081 // Must be one per class and it has to be a VM internal object so java code 1082 // cannot lock it (like the mirror). 1083 // It has to be an object not a Mutex because it's held through java calls. 1084 oop init_lock() const; 1085 1086 // Returns the array class for the n'th dimension 1087 virtual ArrayKlass* array_klass(int n, TRAPS); 1088 virtual ArrayKlass* array_klass_or_null(int n); 1089 1090 // Returns the array class with this class as element type 1091 virtual ArrayKlass* array_klass(TRAPS); 1092 virtual ArrayKlass* array_klass_or_null(); 1093 1094 static void clean_initialization_error_table(); 1095 private: 1096 void fence_and_clear_init_lock(); 1097 1098 bool link_class_impl (TRAPS); 1099 bool verify_code (TRAPS); 1100 void initialize_impl (TRAPS); 1101 void initialize_super_interfaces (TRAPS); 1102 1103 void add_initialization_error(JavaThread* current, Handle exception); 1104 oop get_initialization_error(JavaThread* current); 1105 1106 // find a local method (returns null if not found) 1107 Method* find_method_impl(const Symbol* name, 1108 const Symbol* signature, 1109 OverpassLookupMode overpass_mode, 1110 StaticLookupMode static_mode, 1111 PrivateLookupMode private_mode) const; 1112 1113 static Method* find_method_impl(const Array<Method*>* methods, 1114 const Symbol* name, 1115 const Symbol* signature, 1116 OverpassLookupMode overpass_mode, 1117 StaticLookupMode static_mode, 1118 PrivateLookupMode private_mode); 1119 1120 #if INCLUDE_JVMTI 1121 // RedefineClasses support 1122 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1123 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1124 #endif 1125 // log class name to classlist 1126 void log_to_classlist() const; 1127 public: 1128 1129 #if INCLUDE_CDS 1130 // CDS support - remove and restore oops from metadata. Oops are not shared. 1131 virtual void remove_unshareable_info(); 1132 void remove_unshareable_flags(); 1133 virtual void remove_java_mirror(); 1134 void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, PackageEntry* pkg_entry, TRAPS); 1135 void init_shared_package_entry(); 1136 bool can_be_verified_at_dumptime() const; 1137 void compute_has_loops_flag_for_methods(); 1138 #endif 1139 bool has_init_deps_processed() const { return _misc_flags.has_init_deps_processed(); } 1140 void set_has_init_deps_processed() { 1141 assert(is_initialized(), ""); 1142 assert(!has_init_deps_processed(), "already set"); // one-off action 1143 _misc_flags.set_has_init_deps_processed(true); 1144 } 1145 1146 u2 compute_modifier_flags() const; 1147 1148 public: 1149 // JVMTI support 1150 jint jvmti_class_status() const; 1151 1152 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1153 1154 public: 1155 // Printing 1156 void print_on(outputStream* st) const; 1157 void print_value_on(outputStream* st) const; 1158 1159 void oop_print_value_on(oop obj, outputStream* st); 1160 1161 void oop_print_on (oop obj, outputStream* st); 1162 1163 #ifndef PRODUCT 1164 void print_dependent_nmethods(bool verbose = false); 1165 bool is_dependent_nmethod(nmethod* nm); 1166 bool verify_itable_index(int index); 1167 #endif 1168 1169 const char* internal_name() const; 1170 1171 // Verification 1172 void verify_on(outputStream* st); 1173 1174 void oop_verify_on(oop obj, outputStream* st); 1175 1176 // Logging 1177 void print_class_load_logging(ClassLoaderData* loader_data, 1178 const ModuleEntry* module_entry, 1179 const ClassFileStream* cfs) const; 1180 private: 1181 void print_class_load_cause_logging() const; 1182 void print_class_load_helper(ClassLoaderData* loader_data, 1183 const ModuleEntry* module_entry, 1184 const ClassFileStream* cfs) const; 1185 }; 1186 1187 // for adding methods 1188 // UNSET_IDNUM return means no more ids available 1189 inline u2 InstanceKlass::next_method_idnum() { 1190 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1191 return ConstMethod::UNSET_IDNUM; // no more ids available 1192 } else { 1193 return _idnum_allocated_count++; 1194 } 1195 } 1196 1197 class PrintClassClosure : public KlassClosure { 1198 private: 1199 outputStream* _st; 1200 bool _verbose; 1201 public: 1202 PrintClassClosure(outputStream* st, bool verbose); 1203 1204 void do_klass(Klass* k); 1205 }; 1206 1207 /* JNIid class for jfieldIDs only */ 1208 class JNIid: public CHeapObj<mtClass> { 1209 friend class VMStructs; 1210 private: 1211 Klass* _holder; 1212 JNIid* _next; 1213 int _offset; 1214 #ifdef ASSERT 1215 bool _is_static_field_id; 1216 #endif 1217 1218 public: 1219 // Accessors 1220 Klass* holder() const { return _holder; } 1221 int offset() const { return _offset; } 1222 JNIid* next() { return _next; } 1223 // Constructor 1224 JNIid(Klass* holder, int offset, JNIid* next); 1225 // Identifier lookup 1226 JNIid* find(int offset); 1227 1228 bool find_local_field(fieldDescriptor* fd) { 1229 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1230 } 1231 1232 static void deallocate(JNIid* id); 1233 // Debugging 1234 #ifdef ASSERT 1235 bool is_static_field_id() const { return _is_static_field_id; } 1236 void set_is_static_field_id() { _is_static_field_id = true; } 1237 #endif 1238 void verify(Klass* holder); 1239 }; 1240 1241 // An iterator that's used to access the inner classes indices in the 1242 // InstanceKlass::_inner_classes array. 1243 class InnerClassesIterator : public StackObj { 1244 private: 1245 Array<jushort>* _inner_classes; 1246 int _length; 1247 int _idx; 1248 public: 1249 1250 InnerClassesIterator(const InstanceKlass* k) { 1251 _inner_classes = k->inner_classes(); 1252 if (k->inner_classes() != nullptr) { 1253 _length = _inner_classes->length(); 1254 // The inner class array's length should be the multiple of 1255 // inner_class_next_offset if it only contains the InnerClasses 1256 // attribute data, or it should be 1257 // n*inner_class_next_offset+enclosing_method_attribute_size 1258 // if it also contains the EnclosingMethod data. 1259 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1260 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1261 "just checking"); 1262 // Remove the enclosing_method portion if exists. 1263 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1264 _length -= InstanceKlass::enclosing_method_attribute_size; 1265 } 1266 } else { 1267 _length = 0; 1268 } 1269 _idx = 0; 1270 } 1271 1272 int length() const { 1273 return _length; 1274 } 1275 1276 void next() { 1277 _idx += InstanceKlass::inner_class_next_offset; 1278 } 1279 1280 bool done() const { 1281 return (_idx >= _length); 1282 } 1283 1284 u2 inner_class_info_index() const { 1285 return _inner_classes->at( 1286 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1287 } 1288 1289 void set_inner_class_info_index(u2 index) { 1290 _inner_classes->at_put( 1291 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1292 } 1293 1294 u2 outer_class_info_index() const { 1295 return _inner_classes->at( 1296 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1297 } 1298 1299 void set_outer_class_info_index(u2 index) { 1300 _inner_classes->at_put( 1301 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1302 } 1303 1304 u2 inner_name_index() const { 1305 return _inner_classes->at( 1306 _idx + InstanceKlass::inner_class_inner_name_offset); 1307 } 1308 1309 void set_inner_name_index(u2 index) { 1310 _inner_classes->at_put( 1311 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1312 } 1313 1314 u2 inner_access_flags() const { 1315 return _inner_classes->at( 1316 _idx + InstanceKlass::inner_class_access_flags_offset); 1317 } 1318 }; 1319 1320 // Iterator over class hierarchy under a particular class. Implements depth-first pre-order traversal. 1321 // Usage: 1322 // for (ClassHierarchyIterator iter(root_klass); !iter.done(); iter.next()) { 1323 // Klass* k = iter.klass(); 1324 // ... 1325 // } 1326 class ClassHierarchyIterator : public StackObj { 1327 private: 1328 InstanceKlass* _root; 1329 Klass* _current; 1330 bool _visit_subclasses; 1331 1332 public: 1333 ClassHierarchyIterator(InstanceKlass* root) : _root(root), _current(root), _visit_subclasses(true) { 1334 assert(_root == _current, "required"); // initial state 1335 } 1336 1337 bool done() { 1338 return (_current == nullptr); 1339 } 1340 1341 // Make a step iterating over the class hierarchy under the root class. 1342 // Skips subclasses if requested. 1343 void next(); 1344 1345 Klass* klass() { 1346 assert(!done(), "sanity"); 1347 return _current; 1348 } 1349 1350 // Skip subclasses of the current class. 1351 void skip_subclasses() { 1352 _visit_subclasses = false; 1353 } 1354 }; 1355 1356 #endif // SHARE_OOPS_INSTANCEKLASS_HPP