1 /* 2 * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_OOPS_INSTANCEKLASS_HPP 26 #define SHARE_OOPS_INSTANCEKLASS_HPP 27 28 #include "memory/referenceType.hpp" 29 #include "oops/annotations.hpp" 30 #include "oops/constMethod.hpp" 31 #include "oops/fieldInfo.hpp" 32 #include "oops/instanceOop.hpp" 33 #include "runtime/handles.hpp" 34 #include "utilities/accessFlags.hpp" 35 #include "utilities/align.hpp" 36 #include "utilities/macros.hpp" 37 #if INCLUDE_JFR 38 #include "jfr/support/jfrKlassExtension.hpp" 39 #endif 40 41 class klassItable; 42 class RecordComponent; 43 44 // An InstanceKlass is the VM level representation of a Java class. 45 // It contains all information needed for at class at execution runtime. 46 47 // InstanceKlass embedded field layout (after declared fields): 48 // [EMBEDDED Java vtable ] size in words = vtable_len 49 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size 50 // The embedded nonstatic oop-map blocks are short pairs (offset, length) 51 // indicating where oops are located in instances of this klass. 52 // [EMBEDDED implementor of the interface] only exist for interface 53 54 55 // forward declaration for class -- see below for definition 56 #if INCLUDE_JVMTI 57 class BreakpointInfo; 58 #endif 59 class ClassFileParser; 60 class ClassFileStream; 61 class KlassDepChange; 62 class DependencyContext; 63 class fieldDescriptor; 64 class jniIdMapBase; 65 class JNIid; 66 class JvmtiCachedClassFieldMap; 67 class nmethodBucket; 68 class OopMapCache; 69 class InterpreterOopMap; 70 class PackageEntry; 71 class ModuleEntry; 72 73 // This is used in iterators below. 74 class FieldClosure: public StackObj { 75 public: 76 virtual void do_field(fieldDescriptor* fd) = 0; 77 }; 78 79 // Print fields. 80 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. 81 class FieldPrinter: public FieldClosure { 82 oop _obj; 83 outputStream* _st; 84 public: 85 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} 86 void do_field(fieldDescriptor* fd); 87 }; 88 89 // Describes where oops are located in instances of this klass. 90 class OopMapBlock { 91 public: 92 // Byte offset of the first oop mapped by this block. 93 int offset() const { return _offset; } 94 void set_offset(int offset) { _offset = offset; } 95 96 // Number of oops in this block. 97 uint count() const { return _count; } 98 void set_count(uint count) { _count = count; } 99 100 void increment_count(int diff) { _count += diff; } 101 102 int offset_span() const { return _count * heapOopSize; } 103 104 int end_offset() const { 105 return offset() + offset_span(); 106 } 107 108 bool is_contiguous(int another_offset) const { 109 return another_offset == end_offset(); 110 } 111 112 // sizeof(OopMapBlock) in words. 113 static const int size_in_words() { 114 return align_up((int)sizeof(OopMapBlock), wordSize) >> 115 LogBytesPerWord; 116 } 117 118 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) { 119 return a->offset() - b->offset(); 120 } 121 122 private: 123 int _offset; 124 uint _count; 125 }; 126 127 struct JvmtiCachedClassFileData; 128 129 class InstanceKlass: public Klass { 130 friend class VMStructs; 131 friend class JVMCIVMStructs; 132 friend class ClassFileParser; 133 friend class CompileReplay; 134 135 public: 136 static const KlassKind Kind = InstanceKlassKind; 137 138 protected: 139 InstanceKlass(const ClassFileParser& parser, KlassKind kind = Kind, ReferenceType reference_type = REF_NONE); 140 141 public: 142 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 143 144 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 145 // of the class loading & initialization procedure, and the use of the states. 146 enum ClassState : u1 { 147 allocated, // allocated (but not yet linked) 148 loaded, // loaded and inserted in class hierarchy (but not linked yet) 149 being_linked, // currently running verifier and rewriter 150 linked, // successfully linked/verified (but not initialized yet) 151 being_initialized, // currently running class initializer 152 fully_initialized, // initialized (successful final state) 153 initialization_error // error happened during initialization 154 }; 155 156 private: 157 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS); 158 159 protected: 160 // If you add a new field that points to any metaspace object, you 161 // must add this field to InstanceKlass::metaspace_pointers_do(). 162 163 // Annotations for this class 164 Annotations* _annotations; 165 // Package this class is defined in 166 PackageEntry* _package_entry; 167 // Array classes holding elements of this class. 168 ObjArrayKlass* volatile _array_klasses; 169 // Constant pool for this class. 170 ConstantPool* _constants; 171 // The InnerClasses attribute and EnclosingMethod attribute. The 172 // _inner_classes is an array of shorts. If the class has InnerClasses 173 // attribute, then the _inner_classes array begins with 4-tuples of shorts 174 // [inner_class_info_index, outer_class_info_index, 175 // inner_name_index, inner_class_access_flags] for the InnerClasses 176 // attribute. If the EnclosingMethod attribute exists, it occupies the 177 // last two shorts [class_index, method_index] of the array. If only 178 // the InnerClasses attribute exists, the _inner_classes array length is 179 // number_of_inner_classes * 4. If the class has both InnerClasses 180 // and EnclosingMethod attributes the _inner_classes array length is 181 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 182 Array<jushort>* _inner_classes; 183 184 // The NestMembers attribute. An array of shorts, where each is a 185 // class info index for the class that is a nest member. This data 186 // has not been validated. 187 Array<jushort>* _nest_members; 188 189 // Resolved nest-host klass: either true nest-host or self if we are not 190 // nested, or an error occurred resolving or validating the nominated 191 // nest-host. Can also be set directly by JDK API's that establish nest 192 // relationships. 193 // By always being set it makes nest-member access checks simpler. 194 InstanceKlass* _nest_host; 195 196 // The PermittedSubclasses attribute. An array of shorts, where each is a 197 // class info index for the class that is a permitted subclass. 198 Array<jushort>* _permitted_subclasses; 199 200 // The contents of the Record attribute. 201 Array<RecordComponent*>* _record_components; 202 203 // the source debug extension for this klass, NULL if not specified. 204 // Specified as UTF-8 string without terminating zero byte in the classfile, 205 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 206 const char* _source_debug_extension; 207 208 // Number of heapOopSize words used by non-static fields in this klass 209 // (including inherited fields but after header_size()). 210 int _nonstatic_field_size; 211 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 212 int _nonstatic_oop_map_size; // size in words of nonstatic oop map blocks 213 int _itable_len; // length of Java itable (in words) 214 215 // The NestHost attribute. The class info index for the class 216 // that is the nest-host of this class. This data has not been validated. 217 u2 _nest_host_index; 218 u2 _this_class_index; // constant pool entry 219 u2 _static_oop_field_count; // number of static oop fields in this klass 220 u2 _java_fields_count; // The number of declared Java fields 221 222 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 223 224 // _is_marked_dependent can be set concurrently, thus cannot be part of the 225 // _misc_flags. 226 bool _is_marked_dependent; // used for marking during flushing and deoptimization 227 228 ClassState _init_state; // state of class 229 230 u1 _reference_type; // reference type 231 232 enum { 233 _misc_rewritten = 1 << 0, // methods rewritten. 234 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops 235 _misc_should_verify_class = 1 << 2, // allow caching of preverification 236 _misc_unused = 1 << 3, // not currently used 237 _misc_is_contended = 1 << 4, // marked with contended annotation 238 _misc_has_nonstatic_concrete_methods = 1 << 5, // class/superclass/implemented interfaces has non-static, concrete methods 239 _misc_declares_nonstatic_concrete_methods = 1 << 6, // directly declares non-static, concrete methods 240 _misc_has_been_redefined = 1 << 7, // class has been redefined 241 _misc_shared_loading_failed = 1 << 8, // class has been loaded from shared archive 242 _misc_is_scratch_class = 1 << 9, // class is the redefined scratch class 243 _misc_is_shared_boot_class = 1 << 10, // defining class loader is boot class loader 244 _misc_is_shared_platform_class = 1 << 11, // defining class loader is platform class loader 245 _misc_is_shared_app_class = 1 << 12, // defining class loader is app class loader 246 _misc_has_contended_annotations = 1 << 13 // has @Contended annotation 247 }; 248 u2 shared_loader_type_bits() const { 249 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class; 250 } 251 u2 _misc_flags; // There is more space in access_flags for more flags. 252 253 Monitor* _init_monitor; // mutual exclusion to _init_state and _init_thread. 254 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization) 255 256 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 257 JNIid* _jni_ids; // First JNI identifier for static fields in this class 258 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 259 nmethodBucket* volatile _dep_context; // packed DependencyContext structure 260 uint64_t volatile _dep_context_last_cleaned; 261 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 262 #if INCLUDE_JVMTI 263 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 264 // Linked instanceKlasses of previous versions 265 InstanceKlass* _previous_versions; 266 // JVMTI fields can be moved to their own structure - see 6315920 267 // JVMTI: cached class file, before retransformable agent modified it in CFLH 268 JvmtiCachedClassFileData* _cached_class_file; 269 #endif 270 271 #if INCLUDE_JVMTI 272 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 273 #endif 274 275 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 276 277 // Method array. 278 Array<Method*>* _methods; 279 // Default Method Array, concrete methods inherited from interfaces 280 Array<Method*>* _default_methods; 281 // Interfaces (InstanceKlass*s) this class declares locally to implement. 282 Array<InstanceKlass*>* _local_interfaces; 283 // Interfaces (InstanceKlass*s) this class implements transitively. 284 Array<InstanceKlass*>* _transitive_interfaces; 285 // Int array containing the original order of method in the class file (for JVMTI). 286 Array<int>* _method_ordering; 287 // Int array containing the vtable_indices for default_methods 288 // offset matches _default_methods offset 289 Array<int>* _default_vtable_indices; 290 291 // Instance and static variable information, starts with 6-tuples of shorts 292 // [access, name index, sig index, initval index, low_offset, high_offset] 293 // for all fields, followed by the generic signature data at the end of 294 // the array. Only fields with generic signature attributes have the generic 295 // signature data set in the array. The fields array looks like following: 296 // 297 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 298 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 299 // ... 300 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 301 // [generic signature index] 302 // [generic signature index] 303 // ... 304 Array<u2>* _fields; 305 306 // embedded Java vtable follows here 307 // embedded Java itables follows here 308 // embedded static fields follows here 309 // embedded nonstatic oop-map blocks follows here 310 // embedded implementor of this interface follows here 311 // The embedded implementor only exists if the current klass is an 312 // interface. The possible values of the implementor fall into following 313 // three cases: 314 // NULL: no implementor. 315 // A Klass* that's not itself: one implementor. 316 // Itself: more than one implementors. 317 // 318 319 friend class SystemDictionary; 320 321 static bool _disable_method_binary_search; 322 323 // Controls finalizer registration 324 static bool _finalization_enabled; 325 326 public: 327 328 // Queries finalization state 329 static bool is_finalization_enabled() { return _finalization_enabled; } 330 331 // Sets finalization state 332 static void set_finalization_enabled(bool val) { _finalization_enabled = val; } 333 334 // The three BUILTIN class loader types 335 bool is_shared_boot_class() const { 336 return (_misc_flags & _misc_is_shared_boot_class) != 0; 337 } 338 bool is_shared_platform_class() const { 339 return (_misc_flags & _misc_is_shared_platform_class) != 0; 340 } 341 bool is_shared_app_class() const { 342 return (_misc_flags & _misc_is_shared_app_class) != 0; 343 } 344 // The UNREGISTERED class loader type 345 bool is_shared_unregistered_class() const { 346 return (_misc_flags & shared_loader_type_bits()) == 0; 347 } 348 349 // Check if the class can be shared in CDS 350 bool is_shareable() const; 351 352 bool shared_loading_failed() const { 353 return (_misc_flags & _misc_shared_loading_failed) != 0; 354 } 355 356 void set_shared_loading_failed() { 357 _misc_flags |= _misc_shared_loading_failed; 358 } 359 360 void set_shared_class_loader_type(s2 loader_type); 361 362 void assign_class_loader_type(); 363 364 bool has_nonstatic_fields() const { 365 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 366 } 367 void set_has_nonstatic_fields(bool b) { 368 assert(!has_nonstatic_fields(), "set once"); 369 if (b) { 370 _misc_flags |= _misc_has_nonstatic_fields; 371 } 372 } 373 374 // field sizes 375 int nonstatic_field_size() const { return _nonstatic_field_size; } 376 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 377 378 int static_field_size() const { return _static_field_size; } 379 void set_static_field_size(int size) { _static_field_size = size; } 380 381 int static_oop_field_count() const { return (int)_static_oop_field_count; } 382 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 383 384 // Java itable 385 int itable_length() const { return _itable_len; } 386 void set_itable_length(int len) { _itable_len = len; } 387 388 // array klasses 389 ObjArrayKlass* array_klasses() const { return _array_klasses; } 390 inline ObjArrayKlass* array_klasses_acquire() const; // load with acquire semantics 391 inline void release_set_array_klasses(ObjArrayKlass* k); // store with release semantics 392 393 // methods 394 Array<Method*>* methods() const { return _methods; } 395 void set_methods(Array<Method*>* a) { _methods = a; } 396 Method* method_with_idnum(int idnum); 397 Method* method_with_orig_idnum(int idnum); 398 Method* method_with_orig_idnum(int idnum, int version); 399 400 // method ordering 401 Array<int>* method_ordering() const { return _method_ordering; } 402 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 403 void copy_method_ordering(const intArray* m, TRAPS); 404 405 // default_methods 406 Array<Method*>* default_methods() const { return _default_methods; } 407 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 408 409 // default method vtable_indices 410 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 411 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 412 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 413 414 // interfaces 415 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; } 416 void set_local_interfaces(Array<InstanceKlass*>* a) { 417 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 418 _local_interfaces = a; } 419 420 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; } 421 void set_transitive_interfaces(Array<InstanceKlass*>* a) { 422 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 423 _transitive_interfaces = a; 424 } 425 426 private: 427 friend class fieldDescriptor; 428 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 429 430 public: 431 int field_offset (int index) const { return field(index)->offset(); } 432 int field_access_flags(int index) const { return field(index)->access_flags(); } 433 Symbol* field_name (int index) const { return field(index)->name(constants()); } 434 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 435 436 // Number of Java declared fields 437 int java_fields_count() const { return (int)_java_fields_count; } 438 439 Array<u2>* fields() const { return _fields; } 440 void set_fields(Array<u2>* f, u2 java_fields_count) { 441 guarantee(_fields == NULL || f == NULL, "Just checking"); 442 _fields = f; 443 _java_fields_count = java_fields_count; 444 } 445 446 // inner classes 447 Array<u2>* inner_classes() const { return _inner_classes; } 448 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 449 450 // nest members 451 Array<u2>* nest_members() const { return _nest_members; } 452 void set_nest_members(Array<u2>* m) { _nest_members = m; } 453 454 // nest-host index 455 jushort nest_host_index() const { return _nest_host_index; } 456 void set_nest_host_index(u2 i) { _nest_host_index = i; } 457 // dynamic nest member support 458 void set_nest_host(InstanceKlass* host); 459 460 // record components 461 Array<RecordComponent*>* record_components() const { return _record_components; } 462 void set_record_components(Array<RecordComponent*>* record_components) { 463 _record_components = record_components; 464 } 465 bool is_record() const; 466 467 // permitted subclasses 468 Array<u2>* permitted_subclasses() const { return _permitted_subclasses; } 469 void set_permitted_subclasses(Array<u2>* s) { _permitted_subclasses = s; } 470 471 private: 472 // Called to verify that k is a member of this nest - does not look at k's nest-host, 473 // nor does it resolve any CP entries or load any classes. 474 bool has_nest_member(JavaThread* current, InstanceKlass* k) const; 475 476 public: 477 // Call this only if you know that the nest host has been initialized. 478 InstanceKlass* nest_host_not_null() { 479 assert(_nest_host != NULL, "must be"); 480 return _nest_host; 481 } 482 // Used to construct informative IllegalAccessError messages at a higher level, 483 // if there was an issue resolving or validating the nest host. 484 // Returns NULL if there was no error. 485 const char* nest_host_error(); 486 // Returns nest-host class, resolving and validating it if needed. 487 // Returns NULL if resolution is not possible from the calling context. 488 InstanceKlass* nest_host(TRAPS); 489 // Check if this klass is a nestmate of k - resolves this nest-host and k's 490 bool has_nestmate_access_to(InstanceKlass* k, TRAPS); 491 492 // Called to verify that k is a permitted subclass of this class 493 bool has_as_permitted_subclass(const InstanceKlass* k) const; 494 495 enum InnerClassAttributeOffset { 496 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 497 inner_class_inner_class_info_offset = 0, 498 inner_class_outer_class_info_offset = 1, 499 inner_class_inner_name_offset = 2, 500 inner_class_access_flags_offset = 3, 501 inner_class_next_offset = 4 502 }; 503 504 enum EnclosingMethodAttributeOffset { 505 enclosing_method_class_index_offset = 0, 506 enclosing_method_method_index_offset = 1, 507 enclosing_method_attribute_size = 2 508 }; 509 510 // package 511 PackageEntry* package() const { return _package_entry; } 512 ModuleEntry* module() const; 513 bool in_unnamed_package() const { return (_package_entry == NULL); } 514 void set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS); 515 // If the package for the InstanceKlass is in the boot loader's package entry 516 // table then sets the classpath_index field so that 517 // get_system_package() will know to return a non-null value for the 518 // package's location. And, so that the package will be added to the list of 519 // packages returned by get_system_packages(). 520 // For packages whose classes are loaded from the boot loader class path, the 521 // classpath_index indicates which entry on the boot loader class path. 522 void set_classpath_index(s2 path_index); 523 bool is_same_class_package(const Klass* class2) const; 524 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const; 525 526 // find an enclosing class 527 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 528 529 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 530 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 531 532 private: 533 // Check prohibited package ("java/" only loadable by boot or platform loaders) 534 static void check_prohibited_package(Symbol* class_name, 535 ClassLoaderData* loader_data, 536 TRAPS); 537 public: 538 // initialization state 539 bool is_loaded() const { return init_state() >= loaded; } 540 bool is_linked() const { return init_state() >= linked; } 541 bool is_being_linked() const { return init_state() == being_linked; } 542 bool is_initialized() const { return init_state() == fully_initialized; } 543 bool is_not_initialized() const { return init_state() < being_initialized; } 544 bool is_being_initialized() const { return init_state() == being_initialized; } 545 bool is_in_error_state() const { return init_state() == initialization_error; } 546 bool is_init_thread(Thread *thread) { return thread == _init_thread; } 547 ClassState init_state() const { return Atomic::load(&_init_state); } 548 const char* init_state_name() const; 549 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 550 551 class LockLinkState : public StackObj { 552 InstanceKlass* _ik; 553 JavaThread* _current; 554 public: 555 LockLinkState(InstanceKlass* ik, JavaThread* current) : _ik(ik), _current(current) { 556 ik->check_link_state_and_wait(current); 557 } 558 ~LockLinkState() { 559 if (!_ik->is_linked()) { 560 // Reset to loaded if linking failed. 561 _ik->set_initialization_state_and_notify(loaded, _current); 562 } 563 } 564 }; 565 566 // is this a sealed class 567 bool is_sealed() const; 568 569 // defineClass specified verification 570 bool should_verify_class() const { 571 return (_misc_flags & _misc_should_verify_class) != 0; 572 } 573 void set_should_verify_class(bool value) { 574 assert(!should_verify_class(), "set once"); 575 if (value) { 576 _misc_flags |= _misc_should_verify_class; 577 } 578 } 579 580 // marking 581 bool is_marked_dependent() const { return _is_marked_dependent; } 582 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 583 584 // initialization (virtuals from Klass) 585 bool should_be_initialized() const; // means that initialize should be called 586 void initialize(TRAPS); 587 void link_class(TRAPS); 588 bool link_class_or_fail(TRAPS); // returns false on failure 589 void rewrite_class(TRAPS); 590 void link_methods(TRAPS); 591 Method* class_initializer() const; 592 593 // reference type 594 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 595 596 // this class cp index 597 u2 this_class_index() const { return _this_class_index; } 598 void set_this_class_index(u2 index) { _this_class_index = index; } 599 600 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 601 602 // find local field, returns true if found 603 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 604 // find field in direct superinterfaces, returns the interface in which the field is defined 605 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 606 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 607 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 608 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 609 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 610 611 // find a non-static or static field given its offset within the class. 612 bool contains_field_offset(int offset); 613 614 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 615 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 616 617 private: 618 inline static int quick_search(const Array<Method*>* methods, const Symbol* name); 619 620 public: 621 static void disable_method_binary_search() { 622 _disable_method_binary_search = true; 623 } 624 625 // find a local method (returns NULL if not found) 626 Method* find_method(const Symbol* name, const Symbol* signature) const; 627 static Method* find_method(const Array<Method*>* methods, 628 const Symbol* name, 629 const Symbol* signature); 630 631 // find a local method, but skip static methods 632 Method* find_instance_method(const Symbol* name, const Symbol* signature, 633 PrivateLookupMode private_mode) const; 634 static Method* find_instance_method(const Array<Method*>* methods, 635 const Symbol* name, 636 const Symbol* signature, 637 PrivateLookupMode private_mode); 638 639 // find a local method (returns NULL if not found) 640 Method* find_local_method(const Symbol* name, 641 const Symbol* signature, 642 OverpassLookupMode overpass_mode, 643 StaticLookupMode static_mode, 644 PrivateLookupMode private_mode) const; 645 646 // find a local method from given methods array (returns NULL if not found) 647 static Method* find_local_method(const Array<Method*>* methods, 648 const Symbol* name, 649 const Symbol* signature, 650 OverpassLookupMode overpass_mode, 651 StaticLookupMode static_mode, 652 PrivateLookupMode private_mode); 653 654 // find a local method index in methods or default_methods (returns -1 if not found) 655 static int find_method_index(const Array<Method*>* methods, 656 const Symbol* name, 657 const Symbol* signature, 658 OverpassLookupMode overpass_mode, 659 StaticLookupMode static_mode, 660 PrivateLookupMode private_mode); 661 662 // lookup operation (returns NULL if not found) 663 Method* uncached_lookup_method(const Symbol* name, 664 const Symbol* signature, 665 OverpassLookupMode overpass_mode, 666 PrivateLookupMode private_mode = PrivateLookupMode::find) const; 667 668 // lookup a method in all the interfaces that this class implements 669 // (returns NULL if not found) 670 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 671 672 // lookup a method in local defaults then in all interfaces 673 // (returns NULL if not found) 674 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 675 676 // Find method indices by name. If a method with the specified name is 677 // found the index to the first method is returned, and 'end' is filled in 678 // with the index of first non-name-matching method. If no method is found 679 // -1 is returned. 680 int find_method_by_name(const Symbol* name, int* end) const; 681 static int find_method_by_name(const Array<Method*>* methods, 682 const Symbol* name, int* end); 683 684 // constant pool 685 ConstantPool* constants() const { return _constants; } 686 void set_constants(ConstantPool* c) { _constants = c; } 687 688 // protection domain 689 oop protection_domain() const; 690 691 // signers 692 objArrayOop signers() const; 693 694 bool is_contended() const { 695 return (_misc_flags & _misc_is_contended) != 0; 696 } 697 void set_is_contended(bool value) { 698 assert(!is_contended(), "set once"); 699 if (value) { 700 _misc_flags |= _misc_is_contended; 701 } 702 } 703 704 // source file name 705 Symbol* source_file_name() const { return _constants->source_file_name(); } 706 u2 source_file_name_index() const { return _constants->source_file_name_index(); } 707 void set_source_file_name_index(u2 sourcefile_index) { _constants->set_source_file_name_index(sourcefile_index); } 708 709 // minor and major version numbers of class file 710 u2 minor_version() const { return _constants->minor_version(); } 711 void set_minor_version(u2 minor_version) { _constants->set_minor_version(minor_version); } 712 u2 major_version() const { return _constants->major_version(); } 713 void set_major_version(u2 major_version) { _constants->set_major_version(major_version); } 714 715 // source debug extension 716 const char* source_debug_extension() const { return _source_debug_extension; } 717 void set_source_debug_extension(const char* array, int length); 718 719 // nonstatic oop-map blocks 720 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 721 return oop_map_count * OopMapBlock::size_in_words(); 722 } 723 unsigned int nonstatic_oop_map_count() const { 724 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 725 } 726 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 727 void set_nonstatic_oop_map_size(int words) { 728 _nonstatic_oop_map_size = words; 729 } 730 731 bool has_contended_annotations() const { 732 return ((_misc_flags & _misc_has_contended_annotations) != 0); 733 } 734 void set_has_contended_annotations(bool value) { 735 assert(!has_contended_annotations(), "set once"); 736 if (value) { 737 _misc_flags |= _misc_has_contended_annotations; 738 } 739 } 740 741 #if INCLUDE_JVMTI 742 // Redefinition locking. Class can only be redefined by one thread at a time. 743 // The flag is in access_flags so that it can be set and reset using atomic 744 // operations, and not be reset by other misc_flag settings. 745 bool is_being_redefined() const { 746 return _access_flags.is_being_redefined(); 747 } 748 void set_is_being_redefined(bool value) { 749 if (value) { 750 _access_flags.set_is_being_redefined(); 751 } else { 752 _access_flags.clear_is_being_redefined(); 753 } 754 } 755 756 // RedefineClasses() support for previous versions: 757 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 758 void purge_previous_version_list(); 759 760 InstanceKlass* previous_versions() const { return _previous_versions; } 761 #else 762 InstanceKlass* previous_versions() const { return NULL; } 763 #endif 764 765 InstanceKlass* get_klass_version(int version) { 766 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 767 if (ik->constants()->version() == version) { 768 return ik; 769 } 770 } 771 return NULL; 772 } 773 774 bool has_been_redefined() const { 775 return (_misc_flags & _misc_has_been_redefined) != 0; 776 } 777 void set_has_been_redefined() { 778 _misc_flags |= _misc_has_been_redefined; 779 } 780 781 bool is_scratch_class() const { 782 return (_misc_flags & _misc_is_scratch_class) != 0; 783 } 784 785 void set_is_scratch_class() { 786 _misc_flags |= _misc_is_scratch_class; 787 } 788 789 bool has_resolved_methods() const { 790 return _access_flags.has_resolved_methods(); 791 } 792 793 void set_has_resolved_methods() { 794 _access_flags.set_has_resolved_methods(); 795 } 796 797 public: 798 #if INCLUDE_JVMTI 799 800 void init_previous_versions() { 801 _previous_versions = NULL; 802 } 803 804 private: 805 static bool _has_previous_versions; 806 public: 807 static void purge_previous_versions(InstanceKlass* ik) { 808 if (ik->has_been_redefined()) { 809 ik->purge_previous_version_list(); 810 } 811 } 812 813 static bool has_previous_versions_and_reset(); 814 static bool has_previous_versions() { return _has_previous_versions; } 815 816 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 817 void set_cached_class_file(JvmtiCachedClassFileData *data) { 818 _cached_class_file = data; 819 } 820 JvmtiCachedClassFileData * get_cached_class_file(); 821 jint get_cached_class_file_len(); 822 unsigned char * get_cached_class_file_bytes(); 823 824 // JVMTI: Support for caching of field indices, types, and offsets 825 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 826 _jvmti_cached_class_field_map = descriptor; 827 } 828 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 829 return _jvmti_cached_class_field_map; 830 } 831 #else // INCLUDE_JVMTI 832 833 static void purge_previous_versions(InstanceKlass* ik) { return; }; 834 static bool has_previous_versions_and_reset() { return false; } 835 836 void set_cached_class_file(JvmtiCachedClassFileData *data) { 837 assert(data == NULL, "unexpected call with JVMTI disabled"); 838 } 839 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; } 840 841 #endif // INCLUDE_JVMTI 842 843 bool has_nonstatic_concrete_methods() const { 844 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0; 845 } 846 void set_has_nonstatic_concrete_methods(bool b) { 847 assert(!has_nonstatic_concrete_methods(), "set once"); 848 if (b) { 849 _misc_flags |= _misc_has_nonstatic_concrete_methods; 850 } 851 } 852 853 bool declares_nonstatic_concrete_methods() const { 854 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0; 855 } 856 void set_declares_nonstatic_concrete_methods(bool b) { 857 assert(!declares_nonstatic_concrete_methods(), "set once"); 858 if (b) { 859 _misc_flags |= _misc_declares_nonstatic_concrete_methods; 860 } 861 } 862 863 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 864 inline u2 next_method_idnum(); 865 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 866 867 // generics support 868 Symbol* generic_signature() const { return _constants->generic_signature(); } 869 u2 generic_signature_index() const { return _constants->generic_signature_index(); } 870 void set_generic_signature_index(u2 sig_index) { _constants->set_generic_signature_index(sig_index); } 871 872 u2 enclosing_method_data(int offset) const; 873 u2 enclosing_method_class_index() const { 874 return enclosing_method_data(enclosing_method_class_index_offset); 875 } 876 u2 enclosing_method_method_index() { 877 return enclosing_method_data(enclosing_method_method_index_offset); 878 } 879 void set_enclosing_method_indices(u2 class_index, 880 u2 method_index); 881 882 // jmethodID support 883 jmethodID get_jmethod_id(const methodHandle& method_h); 884 jmethodID get_jmethod_id_fetch_or_update(size_t idnum, 885 jmethodID new_id, jmethodID* new_jmeths, 886 jmethodID* to_dealloc_id_p, 887 jmethodID** to_dealloc_jmeths_p); 888 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 889 size_t *length_p, jmethodID* id_p); 890 void ensure_space_for_methodids(int start_offset = 0); 891 jmethodID jmethod_id_or_null(Method* method); 892 893 // annotations support 894 Annotations* annotations() const { return _annotations; } 895 void set_annotations(Annotations* anno) { _annotations = anno; } 896 897 AnnotationArray* class_annotations() const { 898 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 899 } 900 Array<AnnotationArray*>* fields_annotations() const { 901 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 902 } 903 AnnotationArray* class_type_annotations() const { 904 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 905 } 906 Array<AnnotationArray*>* fields_type_annotations() const { 907 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 908 } 909 // allocation 910 instanceOop allocate_instance(TRAPS); 911 static instanceOop allocate_instance(oop cls, TRAPS); 912 913 // additional member function to return a handle 914 instanceHandle allocate_instance_handle(TRAPS); 915 916 objArrayOop allocate_objArray(int n, int length, TRAPS); 917 // Helper function 918 static instanceOop register_finalizer(instanceOop i, TRAPS); 919 920 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 921 // if not, throw either an Error or an Exception. 922 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 923 924 // initialization 925 void call_class_initializer(TRAPS); 926 void set_initialization_state_and_notify(ClassState state, JavaThread* current); 927 928 // OopMapCache support 929 OopMapCache* oop_map_cache() { return _oop_map_cache; } 930 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 931 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 932 933 // JNI identifier support (for static fields - for jni performance) 934 JNIid* jni_ids() { return _jni_ids; } 935 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 936 JNIid* jni_id_for(int offset); 937 938 // maintenance of deoptimization dependencies 939 inline DependencyContext dependencies(); 940 int mark_dependent_nmethods(KlassDepChange& changes); 941 void add_dependent_nmethod(nmethod* nm); 942 void remove_dependent_nmethod(nmethod* nm); 943 void clean_dependency_context(); 944 945 // On-stack replacement support 946 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 947 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 948 void add_osr_nmethod(nmethod* n); 949 bool remove_osr_nmethod(nmethod* n); 950 int mark_osr_nmethods(const Method* m); 951 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 952 953 #if INCLUDE_JVMTI 954 // Breakpoint support (see methods on Method* for details) 955 BreakpointInfo* breakpoints() const { return _breakpoints; }; 956 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 957 #endif 958 959 // support for stub routines 960 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 961 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;) 962 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 963 964 // subclass/subinterface checks 965 bool implements_interface(Klass* k) const; 966 bool is_same_or_direct_interface(Klass* k) const; 967 968 #ifdef ASSERT 969 // check whether this class or one of its superclasses was redefined 970 bool has_redefined_this_or_super() const; 971 #endif 972 973 // Access to the implementor of an interface. 974 InstanceKlass* implementor() const; 975 void set_implementor(InstanceKlass* ik); 976 int nof_implementors() const; 977 void add_implementor(InstanceKlass* ik); // ik is a new class that implements this interface 978 void init_implementor(); // initialize 979 980 // link this class into the implementors list of every interface it implements 981 void process_interfaces(); 982 983 // virtual operations from Klass 984 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 985 Array<InstanceKlass*>* transitive_interfaces); 986 bool can_be_primary_super_slow() const; 987 size_t oop_size(oop obj) const { return size_helper(); } 988 // slow because it's a virtual call and used for verifying the layout_helper. 989 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 990 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 991 992 // Iterators 993 void do_local_static_fields(FieldClosure* cl); 994 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 995 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 996 void print_nonstatic_fields(FieldClosure* cl); // including inherited and injected fields 997 998 void methods_do(void f(Method* method)); 999 1000 static InstanceKlass* cast(Klass* k) { 1001 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 1002 } 1003 1004 static const InstanceKlass* cast(const Klass* k) { 1005 assert(k != NULL, "k should not be null"); 1006 assert(k->is_instance_klass(), "cast to InstanceKlass"); 1007 return static_cast<const InstanceKlass*>(k); 1008 } 1009 1010 virtual InstanceKlass* java_super() const { 1011 return (super() == NULL) ? NULL : cast(super()); 1012 } 1013 1014 // Sizing (in words) 1015 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 1016 1017 static int size(int vtable_length, int itable_length, 1018 int nonstatic_oop_map_size, 1019 bool is_interface) { 1020 return align_metadata_size(header_size() + 1021 vtable_length + 1022 itable_length + 1023 nonstatic_oop_map_size + 1024 (is_interface ? (int)sizeof(Klass*)/wordSize : 0)); 1025 } 1026 1027 int size() const { return size(vtable_length(), 1028 itable_length(), 1029 nonstatic_oop_map_size(), 1030 is_interface()); 1031 } 1032 1033 1034 inline intptr_t* start_of_itable() const; 1035 inline intptr_t* end_of_itable() const; 1036 inline int itable_offset_in_words() const; 1037 inline oop static_field_base_raw(); 1038 1039 inline OopMapBlock* start_of_nonstatic_oop_maps() const; 1040 inline Klass** end_of_nonstatic_oop_maps() const; 1041 1042 inline InstanceKlass* volatile* adr_implementor() const; 1043 1044 // Use this to return the size of an instance in heap words: 1045 int size_helper() const { 1046 return layout_helper_to_size_helper(layout_helper()); 1047 } 1048 1049 // This bit is initialized in classFileParser.cpp. 1050 // It is false under any of the following conditions: 1051 // - the class is abstract (including any interface) 1052 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1053 // - the class size is larger than FastAllocateSizeLimit 1054 // - the class is java/lang/Class, which cannot be allocated directly 1055 bool can_be_fastpath_allocated() const { 1056 return !layout_helper_needs_slow_path(layout_helper()); 1057 } 1058 1059 // Java itable 1060 klassItable itable() const; // return klassItable wrapper 1061 Method* method_at_itable(InstanceKlass* holder, int index, TRAPS); 1062 Method* method_at_itable_or_null(InstanceKlass* holder, int index, bool& itable_entry_found); 1063 int vtable_index_of_interface_method(Method* method); 1064 1065 #if INCLUDE_JVMTI 1066 void adjust_default_methods(bool* trace_name_printed); 1067 #endif // INCLUDE_JVMTI 1068 1069 void clean_weak_instanceklass_links(); 1070 private: 1071 void clean_implementors_list(); 1072 void clean_method_data(); 1073 1074 public: 1075 // Explicit metaspace deallocation of fields 1076 // For RedefineClasses and class file parsing errors, we need to deallocate 1077 // instanceKlasses and the metadata they point to. 1078 void deallocate_contents(ClassLoaderData* loader_data); 1079 static void deallocate_methods(ClassLoaderData* loader_data, 1080 Array<Method*>* methods); 1081 void static deallocate_interfaces(ClassLoaderData* loader_data, 1082 const Klass* super_klass, 1083 Array<InstanceKlass*>* local_interfaces, 1084 Array<InstanceKlass*>* transitive_interfaces); 1085 void static deallocate_record_components(ClassLoaderData* loader_data, 1086 Array<RecordComponent*>* record_component); 1087 1088 // The constant pool is on stack if any of the methods are executing or 1089 // referenced by handles. 1090 bool on_stack() const { return _constants->on_stack(); } 1091 1092 // callbacks for actions during class unloading 1093 static void unload_class(InstanceKlass* ik); 1094 1095 virtual void release_C_heap_structures(bool release_constant_pool = true); 1096 1097 // Naming 1098 const char* signature_name() const; 1099 1100 // Oop fields (and metadata) iterators 1101 // 1102 // The InstanceKlass iterators also visits the Object's klass. 1103 1104 // Forward iteration 1105 public: 1106 // Iterate over all oop fields in the oop maps. 1107 template <typename T, class OopClosureType> 1108 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1109 1110 // Iterate over all oop fields and metadata. 1111 template <typename T, class OopClosureType> 1112 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 1113 1114 // Iterate over all oop fields in one oop map. 1115 template <typename T, class OopClosureType> 1116 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1117 1118 1119 // Reverse iteration 1120 // Iterate over all oop fields and metadata. 1121 template <typename T, class OopClosureType> 1122 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1123 1124 private: 1125 // Iterate over all oop fields in the oop maps. 1126 template <typename T, class OopClosureType> 1127 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1128 1129 // Iterate over all oop fields in one oop map. 1130 template <typename T, class OopClosureType> 1131 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1132 1133 1134 // Bounded range iteration 1135 public: 1136 // Iterate over all oop fields in the oop maps. 1137 template <typename T, class OopClosureType> 1138 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1139 1140 // Iterate over all oop fields and metadata. 1141 template <typename T, class OopClosureType> 1142 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1143 1144 private: 1145 // Iterate over all oop fields in one oop map. 1146 template <typename T, class OopClosureType> 1147 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1148 1149 1150 public: 1151 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1152 1153 private: 1154 // initialization state 1155 void set_init_state(ClassState state); 1156 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1157 void set_init_thread(Thread *thread) { 1158 assert(thread == nullptr || _init_thread == nullptr, "Only one thread is allowed to own initialization"); 1159 _init_thread = thread; 1160 } 1161 1162 // The RedefineClasses() API can cause new method idnums to be needed 1163 // which will cause the caches to grow. Safety requires different 1164 // cache management logic if the caches can grow instead of just 1165 // going from NULL to non-NULL. 1166 bool idnum_can_increment() const { return has_been_redefined(); } 1167 inline jmethodID* methods_jmethod_ids_acquire() const; 1168 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1169 1170 // Lock during initialization 1171 public: 1172 // Returns the array class for the n'th dimension 1173 virtual Klass* array_klass(int n, TRAPS); 1174 virtual Klass* array_klass_or_null(int n); 1175 1176 // Returns the array class with this class as element type 1177 virtual Klass* array_klass(TRAPS); 1178 virtual Klass* array_klass_or_null(); 1179 1180 static void clean_initialization_error_table(); 1181 1182 Monitor* init_monitor() const { return _init_monitor; } 1183 private: 1184 void check_link_state_and_wait(JavaThread* current); 1185 bool link_class_impl (TRAPS); 1186 bool verify_code (TRAPS); 1187 void initialize_impl (TRAPS); 1188 void initialize_super_interfaces (TRAPS); 1189 1190 void add_initialization_error(JavaThread* current, Handle exception); 1191 oop get_initialization_error(JavaThread* current); 1192 1193 // find a local method (returns NULL if not found) 1194 Method* find_method_impl(const Symbol* name, 1195 const Symbol* signature, 1196 OverpassLookupMode overpass_mode, 1197 StaticLookupMode static_mode, 1198 PrivateLookupMode private_mode) const; 1199 1200 static Method* find_method_impl(const Array<Method*>* methods, 1201 const Symbol* name, 1202 const Symbol* signature, 1203 OverpassLookupMode overpass_mode, 1204 StaticLookupMode static_mode, 1205 PrivateLookupMode private_mode); 1206 1207 #if INCLUDE_JVMTI 1208 // RedefineClasses support 1209 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1210 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1211 #endif 1212 // log class name to classlist 1213 void log_to_classlist() const; 1214 public: 1215 // CDS support - remove and restore oops from metadata. Oops are not shared. 1216 virtual void remove_unshareable_info(); 1217 virtual void remove_java_mirror(); 1218 void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, PackageEntry* pkg_entry, TRAPS); 1219 void init_shared_package_entry(); 1220 bool can_be_verified_at_dumptime() const; 1221 1222 jint compute_modifier_flags() const; 1223 1224 public: 1225 // JVMTI support 1226 jint jvmti_class_status() const; 1227 1228 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1229 1230 public: 1231 // Printing 1232 void print_on(outputStream* st) const; 1233 void print_value_on(outputStream* st) const; 1234 1235 void oop_print_value_on(oop obj, outputStream* st); 1236 1237 void oop_print_on (oop obj, outputStream* st); 1238 1239 #ifndef PRODUCT 1240 void print_dependent_nmethods(bool verbose = false); 1241 bool is_dependent_nmethod(nmethod* nm); 1242 bool verify_itable_index(int index); 1243 #endif 1244 1245 const char* internal_name() const; 1246 1247 // Verification 1248 void verify_on(outputStream* st); 1249 1250 void oop_verify_on(oop obj, outputStream* st); 1251 1252 // Logging 1253 void print_class_load_logging(ClassLoaderData* loader_data, 1254 const ModuleEntry* module_entry, 1255 const ClassFileStream* cfs) const; 1256 }; 1257 1258 // for adding methods 1259 // UNSET_IDNUM return means no more ids available 1260 inline u2 InstanceKlass::next_method_idnum() { 1261 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1262 return ConstMethod::UNSET_IDNUM; // no more ids available 1263 } else { 1264 return _idnum_allocated_count++; 1265 } 1266 } 1267 1268 class PrintClassClosure : public KlassClosure { 1269 private: 1270 outputStream* _st; 1271 bool _verbose; 1272 public: 1273 PrintClassClosure(outputStream* st, bool verbose); 1274 1275 void do_klass(Klass* k); 1276 }; 1277 1278 /* JNIid class for jfieldIDs only */ 1279 class JNIid: public CHeapObj<mtClass> { 1280 friend class VMStructs; 1281 private: 1282 Klass* _holder; 1283 JNIid* _next; 1284 int _offset; 1285 #ifdef ASSERT 1286 bool _is_static_field_id; 1287 #endif 1288 1289 public: 1290 // Accessors 1291 Klass* holder() const { return _holder; } 1292 int offset() const { return _offset; } 1293 JNIid* next() { return _next; } 1294 // Constructor 1295 JNIid(Klass* holder, int offset, JNIid* next); 1296 // Identifier lookup 1297 JNIid* find(int offset); 1298 1299 bool find_local_field(fieldDescriptor* fd) { 1300 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1301 } 1302 1303 static void deallocate(JNIid* id); 1304 // Debugging 1305 #ifdef ASSERT 1306 bool is_static_field_id() const { return _is_static_field_id; } 1307 void set_is_static_field_id() { _is_static_field_id = true; } 1308 #endif 1309 void verify(Klass* holder); 1310 }; 1311 1312 // An iterator that's used to access the inner classes indices in the 1313 // InstanceKlass::_inner_classes array. 1314 class InnerClassesIterator : public StackObj { 1315 private: 1316 Array<jushort>* _inner_classes; 1317 int _length; 1318 int _idx; 1319 public: 1320 1321 InnerClassesIterator(const InstanceKlass* k) { 1322 _inner_classes = k->inner_classes(); 1323 if (k->inner_classes() != NULL) { 1324 _length = _inner_classes->length(); 1325 // The inner class array's length should be the multiple of 1326 // inner_class_next_offset if it only contains the InnerClasses 1327 // attribute data, or it should be 1328 // n*inner_class_next_offset+enclosing_method_attribute_size 1329 // if it also contains the EnclosingMethod data. 1330 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1331 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1332 "just checking"); 1333 // Remove the enclosing_method portion if exists. 1334 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1335 _length -= InstanceKlass::enclosing_method_attribute_size; 1336 } 1337 } else { 1338 _length = 0; 1339 } 1340 _idx = 0; 1341 } 1342 1343 int length() const { 1344 return _length; 1345 } 1346 1347 void next() { 1348 _idx += InstanceKlass::inner_class_next_offset; 1349 } 1350 1351 bool done() const { 1352 return (_idx >= _length); 1353 } 1354 1355 u2 inner_class_info_index() const { 1356 return _inner_classes->at( 1357 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1358 } 1359 1360 void set_inner_class_info_index(u2 index) { 1361 _inner_classes->at_put( 1362 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1363 } 1364 1365 u2 outer_class_info_index() const { 1366 return _inner_classes->at( 1367 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1368 } 1369 1370 void set_outer_class_info_index(u2 index) { 1371 _inner_classes->at_put( 1372 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1373 } 1374 1375 u2 inner_name_index() const { 1376 return _inner_classes->at( 1377 _idx + InstanceKlass::inner_class_inner_name_offset); 1378 } 1379 1380 void set_inner_name_index(u2 index) { 1381 _inner_classes->at_put( 1382 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1383 } 1384 1385 u2 inner_access_flags() const { 1386 return _inner_classes->at( 1387 _idx + InstanceKlass::inner_class_access_flags_offset); 1388 } 1389 }; 1390 1391 // Iterator over class hierarchy under a particular class. Implements depth-first pre-order traversal. 1392 // Usage: 1393 // for (ClassHierarchyIterator iter(root_klass); !iter.done(); iter.next()) { 1394 // Klass* k = iter.klass(); 1395 // ... 1396 // } 1397 class ClassHierarchyIterator : public StackObj { 1398 private: 1399 InstanceKlass* _root; 1400 Klass* _current; 1401 bool _visit_subclasses; 1402 1403 public: 1404 ClassHierarchyIterator(InstanceKlass* root) : _root(root), _current(root), _visit_subclasses(true) { 1405 assert(_root == _current, "required"); // initial state 1406 } 1407 1408 bool done() { 1409 return (_current == NULL); 1410 } 1411 1412 // Make a step iterating over the class hierarchy under the root class. 1413 // Skips subclasses if requested. 1414 void next(); 1415 1416 Klass* klass() { 1417 assert(!done(), "sanity"); 1418 return _current; 1419 } 1420 1421 // Skip subclasses of the current class. 1422 void skip_subclasses() { 1423 _visit_subclasses = false; 1424 } 1425 }; 1426 1427 #endif // SHARE_OOPS_INSTANCEKLASS_HPP