1 /* 2 * Copyright (c) 1997, 2023, 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 inline_type_field_klasses] only if has_inline_fields() == true 61 // [EMBEDDED InlineKlassFixedBlock] only if is an InlineKlass instance 62 63 64 // forward declaration for class -- see below for definition 65 #if INCLUDE_JVMTI 66 class BreakpointInfo; 67 #endif 68 class ClassFileParser; 69 class ClassFileStream; 70 class KlassDepChange; 71 class DependencyContext; 72 class fieldDescriptor; 73 class jniIdMapBase; 74 class JNIid; 75 class JvmtiCachedClassFieldMap; 76 class nmethodBucket; 77 class OopMapCache; 78 class BufferedInlineTypeBlob; 79 class InterpreterOopMap; 80 class PackageEntry; 81 class ModuleEntry; 82 83 // This is used in iterators below. 84 class FieldClosure: public StackObj { 85 public: 86 virtual void do_field(fieldDescriptor* fd) = 0; 87 }; 88 89 // Print fields. 90 // If "obj" argument to constructor is null, prints static fields, otherwise prints non-static fields. 91 class FieldPrinter: public FieldClosure { 92 oop _obj; 93 outputStream* _st; 94 public: 95 FieldPrinter(outputStream* st, oop obj = nullptr) : _obj(obj), _st(st) {} 96 void do_field(fieldDescriptor* fd); 97 }; 98 99 // Describes where oops are located in instances of this klass. 100 class OopMapBlock { 101 public: 102 // Byte offset of the first oop mapped by this block. 103 int offset() const { return _offset; } 104 void set_offset(int offset) { _offset = offset; } 105 106 // Number of oops in this block. 107 uint count() const { return _count; } 108 void set_count(uint count) { _count = count; } 109 110 void increment_count(int diff) { _count += diff; } 111 112 int offset_span() const { return _count * heapOopSize; } 113 114 int end_offset() const { 115 return offset() + offset_span(); 116 } 117 118 bool is_contiguous(int another_offset) const { 119 return another_offset == end_offset(); 120 } 121 122 // sizeof(OopMapBlock) in words. 123 static int size_in_words() { 124 return align_up((int)sizeof(OopMapBlock), wordSize) >> 125 LogBytesPerWord; 126 } 127 128 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) { 129 return a->offset() - b->offset(); 130 } 131 132 private: 133 int _offset; 134 uint _count; 135 }; 136 137 struct JvmtiCachedClassFileData; 138 139 class SigEntry; 140 141 class InlineKlassFixedBlock { 142 Array<SigEntry>** _extended_sig; 143 Array<VMRegPair>** _return_regs; 144 address* _pack_handler; 145 address* _pack_handler_jobject; 146 address* _unpack_handler; 147 int* _default_value_offset; 148 ArrayKlass** _null_free_inline_array_klasses; 149 int _alignment; 150 int _first_field_offset; 151 int _exact_size_in_bytes; 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() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 171 172 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 173 // of the class loading & initialization procedure, and the use of the states. 174 enum ClassState : u1 { 175 allocated, // allocated (but not yet linked) 176 loaded, // loaded and inserted in class hierarchy (but not linked yet) 177 being_linked, // currently running verifier and rewriter 178 linked, // successfully linked/verified (but not initialized yet) 179 being_initialized, // currently running class initializer 180 fully_initialized, // initialized (successful final state) 181 initialization_error // error happened during initialization 182 }; 183 184 private: 185 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS); 186 187 protected: 188 // If you add a new field that points to any metaspace object, you 189 // must add this field to InstanceKlass::metaspace_pointers_do(). 190 191 // Annotations for this class 192 Annotations* _annotations; 193 // Package this class is defined in 194 PackageEntry* _package_entry; 195 // Array classes holding elements of this class. 196 ArrayKlass* volatile _array_klasses; 197 // Constant pool for this class. 198 ConstantPool* _constants; 199 // The InnerClasses attribute and EnclosingMethod attribute. The 200 // _inner_classes is an array of shorts. If the class has InnerClasses 201 // attribute, then the _inner_classes array begins with 4-tuples of shorts 202 // [inner_class_info_index, outer_class_info_index, 203 // inner_name_index, inner_class_access_flags] for the InnerClasses 204 // attribute. If the EnclosingMethod attribute exists, it occupies the 205 // last two shorts [class_index, method_index] of the array. If only 206 // the InnerClasses attribute exists, the _inner_classes array length is 207 // number_of_inner_classes * 4. If the class has both InnerClasses 208 // and EnclosingMethod attributes the _inner_classes array length is 209 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 210 Array<jushort>* _inner_classes; 211 212 // The NestMembers attribute. An array of shorts, where each is a 213 // class info index for the class that is a nest member. This data 214 // has not been validated. 215 Array<jushort>* _nest_members; 216 217 // Resolved nest-host klass: either true nest-host or self if we are not 218 // nested, or an error occurred resolving or validating the nominated 219 // nest-host. Can also be set directly by JDK API's that establish nest 220 // relationships. 221 // By always being set it makes nest-member access checks simpler. 222 InstanceKlass* _nest_host; 223 224 // The PermittedSubclasses attribute. An array of shorts, where each is a 225 // class info index for the class that is a permitted subclass. 226 Array<jushort>* _permitted_subclasses; 227 228 // The contents of the Record attribute. 229 Array<RecordComponent*>* _record_components; 230 231 // the source debug extension for this klass, null if not specified. 232 // Specified as UTF-8 string without terminating zero byte in the classfile, 233 // it is stored in the instanceklass as a null-terminated UTF-8 string 234 const char* _source_debug_extension; 235 236 // Number of heapOopSize words used by non-static fields in this klass 237 // (including inherited fields but after header_size()). 238 int _nonstatic_field_size; 239 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 240 int _nonstatic_oop_map_size; // size in words of nonstatic oop map blocks 241 int _itable_len; // length of Java itable (in words) 242 243 // The NestHost attribute. The class info index for the class 244 // that is the nest-host of this class. This data has not been validated. 245 u2 _nest_host_index; 246 u2 _this_class_index; // constant pool entry 247 u2 _static_oop_field_count; // number of static oop fields in this klass 248 249 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 250 251 volatile ClassState _init_state; // state of class 252 253 u1 _reference_type; // reference type 254 255 // State is set either at parse time or while executing, atomically to not disturb other state 256 InstanceKlassFlags _misc_flags; 257 258 Monitor* _init_monitor; // mutual exclusion to _init_state and _init_thread. 259 JavaThread* volatile _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization) 260 261 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 262 JNIid* _jni_ids; // First JNI identifier for static fields in this class 263 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or null if none 264 nmethodBucket* volatile _dep_context; // packed DependencyContext structure 265 uint64_t volatile _dep_context_last_cleaned; 266 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 267 #if INCLUDE_JVMTI 268 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 269 // Linked instanceKlasses of previous versions 270 InstanceKlass* _previous_versions; 271 // JVMTI fields can be moved to their own structure - see 6315920 272 // JVMTI: cached class file, before retransformable agent modified it in CFLH 273 JvmtiCachedClassFileData* _cached_class_file; 274 #endif 275 276 #if INCLUDE_JVMTI 277 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 278 #endif 279 280 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 281 NOT_PRODUCT(volatile int _shared_class_load_count;) // ensure a shared class is loaded only once 282 283 // Method array. 284 Array<Method*>* _methods; 285 // Default Method Array, concrete methods inherited from interfaces 286 Array<Method*>* _default_methods; 287 // Interfaces (InstanceKlass*s) this class declares locally to implement. 288 Array<InstanceKlass*>* _local_interfaces; 289 // Interfaces (InstanceKlass*s) this class implements transitively. 290 Array<InstanceKlass*>* _transitive_interfaces; 291 // Int array containing the original order of method in the class file (for JVMTI). 292 Array<int>* _method_ordering; 293 // Int array containing the vtable_indices for default_methods 294 // offset matches _default_methods offset 295 Array<int>* _default_vtable_indices; 296 297 // Fields information is stored in an UNSIGNED5 encoded stream (see fieldInfo.hpp) 298 Array<u1>* _fieldinfo_stream; 299 Array<FieldStatus>* _fields_status; 300 301 const Klass** _inline_type_field_klasses; // For "inline class" fields, null if none present 302 Array<u2>* _preload_classes; 303 const InlineKlassFixedBlock* _adr_inlineklass_fixed_block; 304 305 // embedded Java vtable follows here 306 // embedded Java itables follows here 307 // embedded static fields follows here 308 // embedded nonstatic oop-map blocks follows here 309 // embedded implementor of this interface follows here 310 // The embedded implementor only exists if the current klass is an 311 // interface. The possible values of the implementor fall into following 312 // three cases: 313 // null: no implementor. 314 // A Klass* that's not itself: one implementor. 315 // Itself: more than one implementors. 316 // 317 318 friend class SystemDictionary; 319 320 static bool _disable_method_binary_search; 321 322 // Controls finalizer registration 323 static bool _finalization_enabled; 324 325 public: 326 327 // Queries finalization state 328 static bool is_finalization_enabled() { return _finalization_enabled; } 329 330 // Sets finalization state 331 static void set_finalization_enabled(bool val) { _finalization_enabled = val; } 332 333 // The three BUILTIN class loader types 334 bool is_shared_boot_class() const { return _misc_flags.is_shared_boot_class(); } 335 bool is_shared_platform_class() const { return _misc_flags.is_shared_platform_class(); } 336 bool is_shared_app_class() const { return _misc_flags.is_shared_app_class(); } 337 // The UNREGISTERED class loader type 338 bool is_shared_unregistered_class() const { return _misc_flags.is_shared_unregistered_class(); } 339 340 // Check if the class can be shared in CDS 341 bool is_shareable() const; 342 343 bool shared_loading_failed() const { return _misc_flags.shared_loading_failed(); } 344 345 void set_shared_loading_failed() { _misc_flags.set_shared_loading_failed(true); } 346 347 #if INCLUDE_CDS 348 void set_shared_class_loader_type(s2 loader_type) { _misc_flags.set_shared_class_loader_type(loader_type); } 349 void assign_class_loader_type() { _misc_flags.assign_class_loader_type(_class_loader_data); } 350 #endif 351 352 bool has_nonstatic_fields() const { return _misc_flags.has_nonstatic_fields(); } 353 void set_has_nonstatic_fields(bool b) { _misc_flags.set_has_nonstatic_fields(b); } 354 355 bool has_localvariable_table() const { return _misc_flags.has_localvariable_table(); } 356 void set_has_localvariable_table(bool b) { _misc_flags.set_has_localvariable_table(b); } 357 358 bool has_inline_type_fields() const { return _misc_flags.has_inline_type_fields(); } 359 void set_has_inline_type_fields() { _misc_flags.set_has_inline_type_fields(true); } 360 361 bool is_empty_inline_type() const { return _misc_flags.is_empty_inline_type(); } 362 void set_is_empty_inline_type() { _misc_flags.set_is_empty_inline_type(true); } 363 364 // Note: The naturally_atomic property only applies to 365 // inline classes; it is never true on identity classes. 366 // The bit is placed on instanceKlass for convenience. 367 368 // Query if h/w provides atomic load/store for instances. 369 bool is_naturally_atomic() const { return _misc_flags.is_naturally_atomic(); } 370 void set_is_naturally_atomic() { _misc_flags.set_is_naturally_atomic(true); } 371 372 // Query if this class implements jl.NonTearable or was 373 // mentioned in the JVM option ForceNonTearable. 374 // This bit can occur anywhere, but is only significant 375 // for inline classes *and* their super types. 376 // It inherits from supers along with NonTearable. 377 bool is_declared_atomic() const { return _misc_flags.is_declared_atomic(); } 378 void set_is_declared_atomic() { _misc_flags.set_is_declared_atomic(true); } 379 380 bool carries_value_modifier() const { return _misc_flags.carries_value_modifier(); } 381 void set_carries_value_modifier() { _misc_flags.set_carries_value_modifier(true); } 382 383 bool carries_identity_modifier() const { return _misc_flags.carries_identity_modifier(); } 384 void set_carries_identity_modifier() { _misc_flags.set_carries_identity_modifier(true); } 385 386 // field sizes 387 int nonstatic_field_size() const { return _nonstatic_field_size; } 388 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 389 390 int static_field_size() const { return _static_field_size; } 391 void set_static_field_size(int size) { _static_field_size = size; } 392 393 int static_oop_field_count() const { return (int)_static_oop_field_count; } 394 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 395 396 // Java itable 397 int itable_length() const { return _itable_len; } 398 void set_itable_length(int len) { _itable_len = len; } 399 400 // array klasses 401 ArrayKlass* array_klasses() const { return _array_klasses; } 402 inline ArrayKlass* array_klasses_acquire() const; // load with acquire semantics 403 inline void release_set_array_klasses(ArrayKlass* k); // store with release semantics 404 405 // methods 406 Array<Method*>* methods() const { return _methods; } 407 void set_methods(Array<Method*>* a) { _methods = a; } 408 Method* method_with_idnum(int idnum); 409 Method* method_with_orig_idnum(int idnum); 410 Method* method_with_orig_idnum(int idnum, int version); 411 412 // method ordering 413 Array<int>* method_ordering() const { return _method_ordering; } 414 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 415 void copy_method_ordering(const intArray* m, TRAPS); 416 417 // default_methods 418 Array<Method*>* default_methods() const { return _default_methods; } 419 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 420 421 // default method vtable_indices 422 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 423 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 424 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 425 426 // interfaces 427 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; } 428 void set_local_interfaces(Array<InstanceKlass*>* a) { 429 guarantee(_local_interfaces == nullptr || a == nullptr, "Just checking"); 430 _local_interfaces = a; } 431 432 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; } 433 void set_transitive_interfaces(Array<InstanceKlass*>* a) { 434 guarantee(_transitive_interfaces == nullptr || a == nullptr, "Just checking"); 435 _transitive_interfaces = a; 436 } 437 438 private: 439 friend class fieldDescriptor; 440 FieldInfo field(int index) const; 441 442 public: 443 int field_offset (int index) const { return field(index).offset(); } 444 int field_access_flags(int index) const { return field(index).access_flags().as_int(); } 445 FieldInfo::FieldFlags field_flags(int index) const { return field(index).field_flags(); } 446 FieldStatus field_status(int index) const { return fields_status()->at(index); } 447 inline Symbol* field_name (int index) const; 448 inline Symbol* field_signature (int index) const; 449 bool field_is_flat(int index) const { return field_flags(index).is_flat(); } 450 bool field_is_null_free_inline_type(int index) const; 451 452 // Number of Java declared fields 453 int java_fields_count() const; 454 int total_fields_count() const; 455 456 Array<u1>* fieldinfo_stream() const { return _fieldinfo_stream; } 457 void set_fieldinfo_stream(Array<u1>* fis) { _fieldinfo_stream = fis; } 458 459 Array<FieldStatus>* fields_status() const {return _fields_status; } 460 void set_fields_status(Array<FieldStatus>* array) { _fields_status = array; } 461 462 Array<u2>* preload_classes() const { return _preload_classes; } 463 void set_preload_classes(Array<u2>* c) { _preload_classes = c; } 464 465 // inner classes 466 Array<u2>* inner_classes() const { return _inner_classes; } 467 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 468 469 // nest members 470 Array<u2>* nest_members() const { return _nest_members; } 471 void set_nest_members(Array<u2>* m) { _nest_members = m; } 472 473 // nest-host index 474 jushort nest_host_index() const { return _nest_host_index; } 475 void set_nest_host_index(u2 i) { _nest_host_index = i; } 476 // dynamic nest member support 477 void set_nest_host(InstanceKlass* host); 478 479 // record components 480 Array<RecordComponent*>* record_components() const { return _record_components; } 481 void set_record_components(Array<RecordComponent*>* record_components) { 482 _record_components = record_components; 483 } 484 bool is_record() const; 485 486 // permitted subclasses 487 Array<u2>* permitted_subclasses() const { return _permitted_subclasses; } 488 void set_permitted_subclasses(Array<u2>* s) { _permitted_subclasses = s; } 489 490 private: 491 // Called to verify that k is a member of this nest - does not look at k's nest-host, 492 // nor does it resolve any CP entries or load any classes. 493 bool has_nest_member(JavaThread* current, InstanceKlass* k) const; 494 495 public: 496 // Call this only if you know that the nest host has been initialized. 497 InstanceKlass* nest_host_not_null() { 498 assert(_nest_host != nullptr, "must be"); 499 return _nest_host; 500 } 501 // Used to construct informative IllegalAccessError messages at a higher level, 502 // if there was an issue resolving or validating the nest host. 503 // Returns null if there was no error. 504 const char* nest_host_error(); 505 // Returns nest-host class, resolving and validating it if needed. 506 // Returns null if resolution is not possible from the calling context. 507 InstanceKlass* nest_host(TRAPS); 508 // Check if this klass is a nestmate of k - resolves this nest-host and k's 509 bool has_nestmate_access_to(InstanceKlass* k, TRAPS); 510 511 // Called to verify that k is a permitted subclass of this class 512 bool has_as_permitted_subclass(const InstanceKlass* k) const; 513 514 enum InnerClassAttributeOffset { 515 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 516 inner_class_inner_class_info_offset = 0, 517 inner_class_outer_class_info_offset = 1, 518 inner_class_inner_name_offset = 2, 519 inner_class_access_flags_offset = 3, 520 inner_class_next_offset = 4 521 }; 522 523 enum EnclosingMethodAttributeOffset { 524 enclosing_method_class_index_offset = 0, 525 enclosing_method_method_index_offset = 1, 526 enclosing_method_attribute_size = 2 527 }; 528 529 // package 530 PackageEntry* package() const { return _package_entry; } 531 ModuleEntry* module() const; 532 bool in_unnamed_package() const { return (_package_entry == nullptr); } 533 void set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS); 534 // If the package for the InstanceKlass is in the boot loader's package entry 535 // table then sets the classpath_index field so that 536 // get_system_package() will know to return a non-null value for the 537 // package's location. And, so that the package will be added to the list of 538 // packages returned by get_system_packages(). 539 // For packages whose classes are loaded from the boot loader class path, the 540 // classpath_index indicates which entry on the boot loader class path. 541 void set_classpath_index(s2 path_index); 542 bool is_same_class_package(const Klass* class2) const; 543 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const; 544 545 // find an enclosing class 546 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 547 548 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 549 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 550 551 private: 552 // Check prohibited package ("java/" only loadable by boot or platform loaders) 553 static void check_prohibited_package(Symbol* class_name, 554 ClassLoaderData* loader_data, 555 TRAPS); 556 public: 557 // initialization state 558 bool is_loaded() const { return init_state() >= loaded; } 559 bool is_linked() const { return init_state() >= linked; } 560 bool is_being_linked() const { return init_state() == being_linked; } 561 bool is_initialized() const { return init_state() == fully_initialized; } 562 bool is_not_initialized() const { return init_state() < being_initialized; } 563 bool is_being_initialized() const { return init_state() == being_initialized; } 564 bool is_in_error_state() const { return init_state() == initialization_error; } 565 bool is_init_thread(JavaThread *thread) { return thread == Atomic::load(&_init_thread); } 566 ClassState init_state() const { return Atomic::load(&_init_state); } 567 const char* init_state_name() const; 568 bool is_rewritten() const { return _misc_flags.rewritten(); } 569 570 class LockLinkState : public StackObj { 571 InstanceKlass* _ik; 572 JavaThread* _current; 573 public: 574 LockLinkState(InstanceKlass* ik, JavaThread* current) : _ik(ik), _current(current) { 575 ik->check_link_state_and_wait(current); 576 } 577 ~LockLinkState() { 578 if (!_ik->is_linked()) { 579 // Reset to loaded if linking failed. 580 _ik->set_initialization_state_and_notify(loaded, _current); 581 } 582 } 583 }; 584 585 // is this a sealed class 586 bool is_sealed() const; 587 588 // defineClass specified verification 589 bool should_verify_class() const { return _misc_flags.should_verify_class(); } 590 void set_should_verify_class(bool value) { _misc_flags.set_should_verify_class(value); } 591 592 // marking 593 bool is_marked_dependent() const { return _misc_flags.is_marked_dependent(); } 594 void set_is_marked_dependent(bool value) { _misc_flags.set_is_marked_dependent(value); } 595 596 static ByteSize kind_offset() { return in_ByteSize(offset_of(InstanceKlass, _kind)); } 597 static ByteSize misc_flags_offset() { return in_ByteSize(offset_of(InstanceKlass, _misc_flags)); } 598 599 // initialization (virtuals from Klass) 600 bool should_be_initialized() const; // means that initialize should be called 601 void initialize(TRAPS); 602 void link_class(TRAPS); 603 bool link_class_or_fail(TRAPS); // returns false on failure 604 void rewrite_class(TRAPS); 605 void link_methods(TRAPS); 606 Method* class_initializer() const; 607 608 // reference type 609 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 610 611 // this class cp index 612 u2 this_class_index() const { return _this_class_index; } 613 void set_this_class_index(u2 index) { _this_class_index = index; } 614 615 static ByteSize reference_type_offset() { return byte_offset_of(InstanceKlass, _reference_type); } 616 617 // find local field, returns true if found 618 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 619 // find field in direct superinterfaces, returns the interface in which the field is defined 620 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 621 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 622 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 623 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 624 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 625 626 // find a non-static or static field given its offset within the class. 627 bool contains_field_offset(int offset); 628 629 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 630 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 631 632 private: 633 inline static int quick_search(const Array<Method*>* methods, const Symbol* name); 634 635 public: 636 static void disable_method_binary_search() { 637 _disable_method_binary_search = true; 638 } 639 640 // find a local method (returns null if not found) 641 Method* find_method(const Symbol* name, const Symbol* signature) const; 642 static Method* find_method(const Array<Method*>* methods, 643 const Symbol* name, 644 const Symbol* signature); 645 646 // find a local method, but skip static methods 647 Method* find_instance_method(const Symbol* name, const Symbol* signature, 648 PrivateLookupMode private_mode) const; 649 static Method* find_instance_method(const Array<Method*>* methods, 650 const Symbol* name, 651 const Symbol* signature, 652 PrivateLookupMode private_mode); 653 654 // find a local method (returns null if not found) 655 Method* find_local_method(const Symbol* name, 656 const Symbol* signature, 657 OverpassLookupMode overpass_mode, 658 StaticLookupMode static_mode, 659 PrivateLookupMode private_mode) const; 660 661 // find a local method from given methods array (returns null if not found) 662 static Method* find_local_method(const Array<Method*>* methods, 663 const Symbol* name, 664 const Symbol* signature, 665 OverpassLookupMode overpass_mode, 666 StaticLookupMode static_mode, 667 PrivateLookupMode private_mode); 668 669 // find a local method index in methods or default_methods (returns -1 if not found) 670 static int find_method_index(const Array<Method*>* methods, 671 const Symbol* name, 672 const Symbol* signature, 673 OverpassLookupMode overpass_mode, 674 StaticLookupMode static_mode, 675 PrivateLookupMode private_mode); 676 677 // lookup operation (returns null if not found) 678 Method* uncached_lookup_method(const Symbol* name, 679 const Symbol* signature, 680 OverpassLookupMode overpass_mode, 681 PrivateLookupMode private_mode = PrivateLookupMode::find) const; 682 683 // lookup a method in all the interfaces that this class implements 684 // (returns null if not found) 685 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 686 687 // lookup a method in local defaults then in all interfaces 688 // (returns null if not found) 689 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 690 691 // Find method indices by name. If a method with the specified name is 692 // found the index to the first method is returned, and 'end' is filled in 693 // with the index of first non-name-matching method. If no method is found 694 // -1 is returned. 695 int find_method_by_name(const Symbol* name, int* end) const; 696 static int find_method_by_name(const Array<Method*>* methods, 697 const Symbol* name, int* end); 698 699 // constant pool 700 ConstantPool* constants() const { return _constants; } 701 void set_constants(ConstantPool* c) { _constants = c; } 702 703 // protection domain 704 oop protection_domain() const; 705 706 // signers 707 objArrayOop signers() const; 708 709 bool is_contended() const { return _misc_flags.is_contended(); } 710 void set_is_contended(bool value) { _misc_flags.set_is_contended(value); } 711 712 // source file name 713 Symbol* source_file_name() const; 714 u2 source_file_name_index() const; 715 void set_source_file_name_index(u2 sourcefile_index); 716 717 // minor and major version numbers of class file 718 u2 minor_version() const; 719 void set_minor_version(u2 minor_version); 720 u2 major_version() const; 721 void set_major_version(u2 major_version); 722 723 // source debug extension 724 const char* source_debug_extension() const { return _source_debug_extension; } 725 void set_source_debug_extension(const char* array, int length); 726 727 // nonstatic oop-map blocks 728 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 729 return oop_map_count * OopMapBlock::size_in_words(); 730 } 731 unsigned int nonstatic_oop_map_count() const { 732 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 733 } 734 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 735 void set_nonstatic_oop_map_size(int words) { 736 _nonstatic_oop_map_size = words; 737 } 738 739 bool has_contended_annotations() const { return _misc_flags.has_contended_annotations(); } 740 void set_has_contended_annotations(bool value) { _misc_flags.set_has_contended_annotations(value); } 741 742 #if INCLUDE_JVMTI 743 // Redefinition locking. Class can only be redefined by one thread at a time. 744 // The flag is in access_flags so that it can be set and reset using atomic 745 // operations, and not be reset by other misc_flag settings. 746 bool is_being_redefined() const { return _misc_flags.is_being_redefined(); } 747 void set_is_being_redefined(bool value) { _misc_flags.set_is_being_redefined(value); } 748 749 // RedefineClasses() support for previous versions: 750 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 751 void purge_previous_version_list(); 752 753 InstanceKlass* previous_versions() const { return _previous_versions; } 754 #else 755 InstanceKlass* previous_versions() const { return nullptr; } 756 #endif 757 758 InstanceKlass* get_klass_version(int version); 759 760 bool has_been_redefined() const { return _misc_flags.has_been_redefined(); } 761 void set_has_been_redefined() { _misc_flags.set_has_been_redefined(true); } 762 763 bool is_scratch_class() const { return _misc_flags.is_scratch_class(); } 764 void set_is_scratch_class() { _misc_flags.set_is_scratch_class(true); } 765 766 bool has_resolved_methods() const { return _misc_flags.has_resolved_methods(); } 767 void set_has_resolved_methods() { _misc_flags.set_has_resolved_methods(true); } 768 void set_has_resolved_methods(bool value) { _misc_flags.set_has_resolved_methods(value); } 769 770 public: 771 #if INCLUDE_JVMTI 772 773 void init_previous_versions() { 774 _previous_versions = nullptr; 775 } 776 777 private: 778 static bool _should_clean_previous_versions; 779 public: 780 static void purge_previous_versions(InstanceKlass* ik) { 781 if (ik->has_been_redefined()) { 782 ik->purge_previous_version_list(); 783 } 784 } 785 786 static bool should_clean_previous_versions_and_reset(); 787 static bool should_clean_previous_versions() { return _should_clean_previous_versions; } 788 789 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 790 void set_cached_class_file(JvmtiCachedClassFileData *data) { 791 _cached_class_file = data; 792 } 793 JvmtiCachedClassFileData * get_cached_class_file(); 794 jint get_cached_class_file_len(); 795 unsigned char * get_cached_class_file_bytes(); 796 797 // JVMTI: Support for caching of field indices, types, and offsets 798 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 799 _jvmti_cached_class_field_map = descriptor; 800 } 801 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 802 return _jvmti_cached_class_field_map; 803 } 804 #else // INCLUDE_JVMTI 805 806 static void purge_previous_versions(InstanceKlass* ik) { return; }; 807 static bool should_clean_previous_versions_and_reset() { return false; } 808 809 void set_cached_class_file(JvmtiCachedClassFileData *data) { 810 assert(data == nullptr, "unexpected call with JVMTI disabled"); 811 } 812 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)nullptr; } 813 814 #endif // INCLUDE_JVMTI 815 816 bool has_nonstatic_concrete_methods() const { return _misc_flags.has_nonstatic_concrete_methods(); } 817 void set_has_nonstatic_concrete_methods(bool b) { _misc_flags.set_has_nonstatic_concrete_methods(b); } 818 819 bool declares_nonstatic_concrete_methods() const { return _misc_flags.declares_nonstatic_concrete_methods(); } 820 void set_declares_nonstatic_concrete_methods(bool b) { _misc_flags.set_declares_nonstatic_concrete_methods(b); } 821 822 bool has_vanilla_constructor() const { return _misc_flags.has_vanilla_constructor(); } 823 void set_has_vanilla_constructor() { _misc_flags.set_has_vanilla_constructor(true); } 824 bool has_miranda_methods () const { return _misc_flags.has_miranda_methods(); } 825 void set_has_miranda_methods() { _misc_flags.set_has_miranda_methods(true); } 826 bool has_final_method() const { return _misc_flags.has_final_method(); } 827 void set_has_final_method() { _misc_flags.set_has_final_method(true); } 828 829 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 830 inline u2 next_method_idnum(); 831 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 832 833 // generics support 834 Symbol* generic_signature() const; 835 u2 generic_signature_index() const; 836 void set_generic_signature_index(u2 sig_index); 837 838 u2 enclosing_method_data(int offset) const; 839 u2 enclosing_method_class_index() const { 840 return enclosing_method_data(enclosing_method_class_index_offset); 841 } 842 u2 enclosing_method_method_index() { 843 return enclosing_method_data(enclosing_method_method_index_offset); 844 } 845 void set_enclosing_method_indices(u2 class_index, 846 u2 method_index); 847 848 // jmethodID support 849 jmethodID get_jmethod_id(const methodHandle& method_h); 850 jmethodID get_jmethod_id_fetch_or_update(size_t idnum, 851 jmethodID new_id, jmethodID* new_jmeths, 852 jmethodID* to_dealloc_id_p, 853 jmethodID** to_dealloc_jmeths_p); 854 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 855 size_t *length_p, jmethodID* id_p); 856 void ensure_space_for_methodids(int start_offset = 0); 857 jmethodID jmethod_id_or_null(Method* method); 858 859 // annotations support 860 Annotations* annotations() const { return _annotations; } 861 void set_annotations(Annotations* anno) { _annotations = anno; } 862 863 AnnotationArray* class_annotations() const { 864 return (_annotations != nullptr) ? _annotations->class_annotations() : nullptr; 865 } 866 Array<AnnotationArray*>* fields_annotations() const { 867 return (_annotations != nullptr) ? _annotations->fields_annotations() : nullptr; 868 } 869 AnnotationArray* class_type_annotations() const { 870 return (_annotations != nullptr) ? _annotations->class_type_annotations() : nullptr; 871 } 872 Array<AnnotationArray*>* fields_type_annotations() const { 873 return (_annotations != nullptr) ? _annotations->fields_type_annotations() : nullptr; 874 } 875 // allocation 876 instanceOop allocate_instance(TRAPS); 877 static instanceOop allocate_instance(oop cls, TRAPS); 878 879 // additional member function to return a handle 880 instanceHandle allocate_instance_handle(TRAPS); 881 882 objArrayOop allocate_objArray(int n, int length, TRAPS); 883 // Helper function 884 static instanceOop register_finalizer(instanceOop i, TRAPS); 885 886 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 887 // if not, throw either an Error or an Exception. 888 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 889 890 // initialization 891 void call_class_initializer(TRAPS); 892 void set_initialization_state_and_notify(ClassState state, JavaThread* current); 893 894 // OopMapCache support 895 OopMapCache* oop_map_cache() { return _oop_map_cache; } 896 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 897 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 898 899 // JNI identifier support (for static fields - for jni performance) 900 JNIid* jni_ids() { return _jni_ids; } 901 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 902 JNIid* jni_id_for(int offset); 903 904 // maintenance of deoptimization dependencies 905 inline DependencyContext dependencies(); 906 void mark_dependent_nmethods(DeoptimizationScope* deopt_scope, KlassDepChange& changes); 907 void add_dependent_nmethod(nmethod* nm); 908 void clean_dependency_context(); 909 // Setup link to hierarchy and deoptimize 910 void add_to_hierarchy(JavaThread* current); 911 912 // On-stack replacement support 913 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 914 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 915 void add_osr_nmethod(nmethod* n); 916 bool remove_osr_nmethod(nmethod* n); 917 int mark_osr_nmethods(DeoptimizationScope* deopt_scope, const Method* m); 918 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 919 920 #if INCLUDE_JVMTI 921 // Breakpoint support (see methods on Method* for details) 922 BreakpointInfo* breakpoints() const { return _breakpoints; }; 923 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 924 #endif 925 926 // support for stub routines 927 static ByteSize init_state_offset() { return byte_offset_of(InstanceKlass, _init_state); } 928 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;) 929 static ByteSize init_thread_offset() { return byte_offset_of(InstanceKlass, _init_thread); } 930 931 static ByteSize inline_type_field_klasses_offset() { return in_ByteSize(offset_of(InstanceKlass, _inline_type_field_klasses)); } 932 static ByteSize adr_inlineklass_fixed_block_offset() { return in_ByteSize(offset_of(InstanceKlass, _adr_inlineklass_fixed_block)); } 933 934 // subclass/subinterface checks 935 bool implements_interface(Klass* k) const; 936 bool is_same_or_direct_interface(Klass* k) const; 937 938 #ifdef ASSERT 939 // check whether this class or one of its superclasses was redefined 940 bool has_redefined_this_or_super() const; 941 #endif 942 943 // Access to the implementor of an interface. 944 InstanceKlass* implementor() const; 945 void set_implementor(InstanceKlass* ik); 946 int nof_implementors() const; 947 void add_implementor(InstanceKlass* ik); // ik is a new class that implements this interface 948 void init_implementor(); // initialize 949 950 private: 951 // link this class into the implementors list of every interface it implements 952 void process_interfaces(); 953 954 public: 955 // virtual operations from Klass 956 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 957 Array<InstanceKlass*>* transitive_interfaces); 958 bool can_be_primary_super_slow() const; 959 size_t oop_size(oop obj) const { return size_helper(); } 960 // slow because it's a virtual call and used for verifying the layout_helper. 961 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 962 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 963 964 // Iterators 965 void do_local_static_fields(FieldClosure* cl); 966 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 967 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 968 void print_nonstatic_fields(FieldClosure* cl); // including inherited and injected fields 969 970 void methods_do(void f(Method* method)); 971 972 static InstanceKlass* cast(Klass* k) { 973 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 974 } 975 976 static const InstanceKlass* cast(const Klass* k) { 977 assert(k != nullptr, "k should not be null"); 978 assert(k->is_instance_klass(), "cast to InstanceKlass"); 979 return static_cast<const InstanceKlass*>(k); 980 } 981 982 virtual InstanceKlass* java_super() const { 983 return (super() == nullptr) ? nullptr : cast(super()); 984 } 985 986 // Sizing (in words) 987 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 988 989 static int size(int vtable_length, int itable_length, 990 int nonstatic_oop_map_size, 991 bool is_interface, 992 int java_fields, bool is_inline_type) { 993 return align_metadata_size(header_size() + 994 vtable_length + 995 itable_length + 996 nonstatic_oop_map_size + 997 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 998 (java_fields * (int)sizeof(Klass*)/wordSize) + 999 (is_inline_type ? (int)sizeof(InlineKlassFixedBlock) : 0)); 1000 } 1001 1002 int size() const { return size(vtable_length(), 1003 itable_length(), 1004 nonstatic_oop_map_size(), 1005 is_interface(), 1006 has_inline_type_fields() ? java_fields_count() : 0, 1007 is_inline_klass()); 1008 } 1009 1010 1011 inline intptr_t* start_of_itable() const; 1012 inline intptr_t* end_of_itable() const; 1013 inline oop static_field_base_raw(); 1014 bool bounds_check(address addr, bool edge_ok = false, intptr_t size_in_bytes = -1) const PRODUCT_RETURN0; 1015 1016 inline OopMapBlock* start_of_nonstatic_oop_maps() const; 1017 inline Klass** end_of_nonstatic_oop_maps() const; 1018 1019 inline InstanceKlass* volatile* adr_implementor() const; 1020 1021 inline address adr_inline_type_field_klasses() const; 1022 inline Klass* get_inline_type_field_klass(int idx) const; 1023 inline Klass* get_inline_type_field_klass_or_null(int idx) const; 1024 inline void set_inline_type_field_klass(int idx, Klass* k); 1025 inline void reset_inline_type_field_klass(int idx); 1026 1027 // Use this to return the size of an instance in heap words: 1028 virtual int size_helper() const { 1029 return layout_helper_to_size_helper(layout_helper()); 1030 } 1031 1032 // This bit is initialized in classFileParser.cpp. 1033 // It is false under any of the following conditions: 1034 // - the class is abstract (including any interface) 1035 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1036 // - the class size is larger than FastAllocateSizeLimit 1037 // - the class is java/lang/Class, which cannot be allocated directly 1038 bool can_be_fastpath_allocated() const { 1039 return !layout_helper_needs_slow_path(layout_helper()); 1040 } 1041 1042 // Java itable 1043 klassItable itable() const; // return klassItable wrapper 1044 Method* method_at_itable(InstanceKlass* holder, int index, TRAPS); 1045 Method* method_at_itable_or_null(InstanceKlass* holder, int index, bool& itable_entry_found); 1046 int vtable_index_of_interface_method(Method* method); 1047 1048 #if INCLUDE_JVMTI 1049 void adjust_default_methods(bool* trace_name_printed); 1050 #endif // INCLUDE_JVMTI 1051 1052 void clean_weak_instanceklass_links(); 1053 private: 1054 void clean_implementors_list(); 1055 void clean_method_data(); 1056 1057 public: 1058 // Explicit metaspace deallocation of fields 1059 // For RedefineClasses and class file parsing errors, we need to deallocate 1060 // instanceKlasses and the metadata they point to. 1061 void deallocate_contents(ClassLoaderData* loader_data); 1062 static void deallocate_methods(ClassLoaderData* loader_data, 1063 Array<Method*>* methods); 1064 void static deallocate_interfaces(ClassLoaderData* loader_data, 1065 const Klass* super_klass, 1066 Array<InstanceKlass*>* local_interfaces, 1067 Array<InstanceKlass*>* transitive_interfaces); 1068 void static deallocate_record_components(ClassLoaderData* loader_data, 1069 Array<RecordComponent*>* record_component); 1070 1071 virtual bool on_stack() const; 1072 1073 // callbacks for actions during class unloading 1074 static void unload_class(InstanceKlass* ik); 1075 1076 virtual void release_C_heap_structures(bool release_sub_metadata = true); 1077 1078 // Naming 1079 const char* signature_name() const; 1080 const char* signature_name_of_carrier(char c) const; 1081 1082 // Oop fields (and metadata) iterators 1083 // 1084 // The InstanceKlass iterators also visits the Object's klass. 1085 1086 // Forward iteration 1087 public: 1088 // Iterate over all oop fields in the oop maps. 1089 template <typename T, class OopClosureType> 1090 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1091 1092 // Iterate over all oop fields and metadata. 1093 template <typename T, class OopClosureType> 1094 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 1095 1096 // Iterate over all oop fields in one oop map. 1097 template <typename T, class OopClosureType> 1098 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1099 1100 1101 // Reverse iteration 1102 // Iterate over all oop fields and metadata. 1103 template <typename T, class OopClosureType> 1104 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1105 1106 private: 1107 // Iterate over all oop fields in the oop maps. 1108 template <typename T, class OopClosureType> 1109 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1110 1111 // Iterate over all oop fields in one oop map. 1112 template <typename T, class OopClosureType> 1113 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1114 1115 1116 // Bounded range iteration 1117 public: 1118 // Iterate over all oop fields in the oop maps. 1119 template <typename T, class OopClosureType> 1120 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1121 1122 // Iterate over all oop fields and metadata. 1123 template <typename T, class OopClosureType> 1124 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1125 1126 private: 1127 // Iterate over all oop fields in one oop map. 1128 template <typename T, class OopClosureType> 1129 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1130 1131 1132 public: 1133 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1134 1135 private: 1136 // initialization state 1137 void set_init_state(ClassState state); 1138 void set_rewritten() { _misc_flags.set_rewritten(true); } 1139 void set_init_thread(JavaThread *thread) { 1140 assert((thread == JavaThread::current() && _init_thread == nullptr) || 1141 (thread == nullptr && _init_thread == JavaThread::current()), "Only one thread is allowed to own initialization"); 1142 Atomic::store(&_init_thread, thread); 1143 } 1144 1145 // The RedefineClasses() API can cause new method idnums to be needed 1146 // which will cause the caches to grow. Safety requires different 1147 // cache management logic if the caches can grow instead of just 1148 // going from null to non-null. 1149 bool idnum_can_increment() const { return has_been_redefined(); } 1150 inline jmethodID* methods_jmethod_ids_acquire() const; 1151 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1152 1153 // Lock during initialization 1154 public: 1155 // Returns the array class for the n'th dimension 1156 virtual Klass* array_klass(int n, TRAPS); 1157 virtual Klass* array_klass_or_null(int n); 1158 1159 // Returns the array class with this class as element type 1160 virtual Klass* array_klass(TRAPS); 1161 virtual Klass* array_klass_or_null(); 1162 1163 static void clean_initialization_error_table(); 1164 1165 Monitor* init_monitor() const { return _init_monitor; } 1166 private: 1167 void check_link_state_and_wait(JavaThread* current); 1168 bool link_class_impl (TRAPS); 1169 bool verify_code (TRAPS); 1170 void initialize_impl (TRAPS); 1171 void initialize_super_interfaces (TRAPS); 1172 1173 void add_initialization_error(JavaThread* current, Handle exception); 1174 oop get_initialization_error(JavaThread* current); 1175 1176 // find a local method (returns null if not found) 1177 Method* find_method_impl(const Symbol* name, 1178 const Symbol* signature, 1179 OverpassLookupMode overpass_mode, 1180 StaticLookupMode static_mode, 1181 PrivateLookupMode private_mode) const; 1182 1183 static Method* find_method_impl(const Array<Method*>* methods, 1184 const Symbol* name, 1185 const Symbol* signature, 1186 OverpassLookupMode overpass_mode, 1187 StaticLookupMode static_mode, 1188 PrivateLookupMode private_mode); 1189 1190 #if INCLUDE_JVMTI 1191 // RedefineClasses support 1192 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1193 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1194 #endif 1195 // log class name to classlist 1196 void log_to_classlist() const; 1197 public: 1198 1199 #if INCLUDE_CDS 1200 // CDS support - remove and restore oops from metadata. Oops are not shared. 1201 virtual void remove_unshareable_info(); 1202 void remove_unshareable_flags(); 1203 virtual void remove_java_mirror(); 1204 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, PackageEntry* pkg_entry, TRAPS); 1205 void init_shared_package_entry(); 1206 bool can_be_verified_at_dumptime() const; 1207 bool methods_contain_jsr_bytecode() const; 1208 void compute_has_loops_flag_for_methods(); 1209 #endif 1210 1211 jint compute_modifier_flags() const; 1212 1213 public: 1214 // JVMTI support 1215 jint jvmti_class_status() const; 1216 1217 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1218 1219 public: 1220 // Printing 1221 void print_on(outputStream* st) const; 1222 void print_value_on(outputStream* st) const; 1223 1224 void oop_print_value_on(oop obj, outputStream* st); 1225 1226 void oop_print_on (oop obj, outputStream* st); 1227 1228 #ifndef PRODUCT 1229 void print_dependent_nmethods(bool verbose = false); 1230 bool is_dependent_nmethod(nmethod* nm); 1231 bool verify_itable_index(int index); 1232 #endif 1233 1234 const char* internal_name() const; 1235 1236 // Verification 1237 void verify_on(outputStream* st); 1238 1239 void oop_verify_on(oop obj, outputStream* st); 1240 1241 // Logging 1242 void print_class_load_logging(ClassLoaderData* loader_data, 1243 const ModuleEntry* module_entry, 1244 const ClassFileStream* cfs) const; 1245 private: 1246 void print_class_load_cause_logging() const; 1247 void print_class_load_helper(ClassLoaderData* loader_data, 1248 const ModuleEntry* module_entry, 1249 const ClassFileStream* cfs) const; 1250 }; 1251 1252 // for adding methods 1253 // UNSET_IDNUM return means no more ids available 1254 inline u2 InstanceKlass::next_method_idnum() { 1255 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1256 return ConstMethod::UNSET_IDNUM; // no more ids available 1257 } else { 1258 return _idnum_allocated_count++; 1259 } 1260 } 1261 1262 class PrintClassClosure : public KlassClosure { 1263 private: 1264 outputStream* _st; 1265 bool _verbose; 1266 public: 1267 PrintClassClosure(outputStream* st, bool verbose); 1268 1269 void do_klass(Klass* k); 1270 }; 1271 1272 /* JNIid class for jfieldIDs only */ 1273 class JNIid: public CHeapObj<mtClass> { 1274 friend class VMStructs; 1275 private: 1276 Klass* _holder; 1277 JNIid* _next; 1278 int _offset; 1279 #ifdef ASSERT 1280 bool _is_static_field_id; 1281 #endif 1282 1283 public: 1284 // Accessors 1285 Klass* holder() const { return _holder; } 1286 int offset() const { return _offset; } 1287 JNIid* next() { return _next; } 1288 // Constructor 1289 JNIid(Klass* holder, int offset, JNIid* next); 1290 // Identifier lookup 1291 JNIid* find(int offset); 1292 1293 bool find_local_field(fieldDescriptor* fd) { 1294 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1295 } 1296 1297 static void deallocate(JNIid* id); 1298 // Debugging 1299 #ifdef ASSERT 1300 bool is_static_field_id() const { return _is_static_field_id; } 1301 void set_is_static_field_id() { _is_static_field_id = true; } 1302 #endif 1303 void verify(Klass* holder); 1304 }; 1305 1306 // An iterator that's used to access the inner classes indices in the 1307 // InstanceKlass::_inner_classes array. 1308 class InnerClassesIterator : public StackObj { 1309 private: 1310 Array<jushort>* _inner_classes; 1311 int _length; 1312 int _idx; 1313 public: 1314 1315 InnerClassesIterator(const InstanceKlass* k) { 1316 _inner_classes = k->inner_classes(); 1317 if (k->inner_classes() != nullptr) { 1318 _length = _inner_classes->length(); 1319 // The inner class array's length should be the multiple of 1320 // inner_class_next_offset if it only contains the InnerClasses 1321 // attribute data, or it should be 1322 // n*inner_class_next_offset+enclosing_method_attribute_size 1323 // if it also contains the EnclosingMethod data. 1324 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1325 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1326 "just checking"); 1327 // Remove the enclosing_method portion if exists. 1328 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1329 _length -= InstanceKlass::enclosing_method_attribute_size; 1330 } 1331 } else { 1332 _length = 0; 1333 } 1334 _idx = 0; 1335 } 1336 1337 int length() const { 1338 return _length; 1339 } 1340 1341 void next() { 1342 _idx += InstanceKlass::inner_class_next_offset; 1343 } 1344 1345 bool done() const { 1346 return (_idx >= _length); 1347 } 1348 1349 u2 inner_class_info_index() const { 1350 return _inner_classes->at( 1351 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1352 } 1353 1354 void set_inner_class_info_index(u2 index) { 1355 _inner_classes->at_put( 1356 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1357 } 1358 1359 u2 outer_class_info_index() const { 1360 return _inner_classes->at( 1361 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1362 } 1363 1364 void set_outer_class_info_index(u2 index) { 1365 _inner_classes->at_put( 1366 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1367 } 1368 1369 u2 inner_name_index() const { 1370 return _inner_classes->at( 1371 _idx + InstanceKlass::inner_class_inner_name_offset); 1372 } 1373 1374 void set_inner_name_index(u2 index) { 1375 _inner_classes->at_put( 1376 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1377 } 1378 1379 u2 inner_access_flags() const { 1380 return _inner_classes->at( 1381 _idx + InstanceKlass::inner_class_access_flags_offset); 1382 } 1383 }; 1384 1385 // Iterator over class hierarchy under a particular class. Implements depth-first pre-order traversal. 1386 // Usage: 1387 // for (ClassHierarchyIterator iter(root_klass); !iter.done(); iter.next()) { 1388 // Klass* k = iter.klass(); 1389 // ... 1390 // } 1391 class ClassHierarchyIterator : public StackObj { 1392 private: 1393 InstanceKlass* _root; 1394 Klass* _current; 1395 bool _visit_subclasses; 1396 1397 public: 1398 ClassHierarchyIterator(InstanceKlass* root) : _root(root), _current(root), _visit_subclasses(true) { 1399 assert(_root == _current, "required"); // initial state 1400 } 1401 1402 bool done() { 1403 return (_current == nullptr); 1404 } 1405 1406 // Make a step iterating over the class hierarchy under the root class. 1407 // Skips subclasses if requested. 1408 void next(); 1409 1410 Klass* klass() { 1411 assert(!done(), "sanity"); 1412 return _current; 1413 } 1414 1415 // Skip subclasses of the current class. 1416 void skip_subclasses() { 1417 _visit_subclasses = false; 1418 } 1419 }; 1420 1421 #endif // SHARE_OOPS_INSTANCEKLASS_HPP