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 _nonstatic_oop_field_count;// number of non-static oop fields in this klass 221 u2 _java_fields_count; // The number of declared Java fields 222 223 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 224 225 // _is_marked_dependent can be set concurrently, thus cannot be part of the 226 // _misc_flags. 227 bool _is_marked_dependent; // used for marking during flushing and deoptimization 228 229 ClassState _init_state; // state of class 230 231 u1 _reference_type; // reference type 232 233 enum { 234 _misc_rewritten = 1 << 0, // methods rewritten. 235 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops 236 _misc_should_verify_class = 1 << 2, // allow caching of preverification 237 _misc_unused = 1 << 3, // not currently used 238 _misc_is_contended = 1 << 4, // marked with contended annotation 239 _misc_has_nonstatic_concrete_methods = 1 << 5, // class/superclass/implemented interfaces has non-static, concrete methods 240 _misc_declares_nonstatic_concrete_methods = 1 << 6, // directly declares non-static, concrete methods 241 _misc_has_been_redefined = 1 << 7, // class has been redefined 242 _misc_shared_loading_failed = 1 << 8, // class has been loaded from shared archive 243 _misc_is_scratch_class = 1 << 9, // class is the redefined scratch class 244 _misc_is_shared_boot_class = 1 << 10, // defining class loader is boot class loader 245 _misc_is_shared_platform_class = 1 << 11, // defining class loader is platform class loader 246 _misc_is_shared_app_class = 1 << 12, // defining class loader is app class loader 247 _misc_has_contended_annotations = 1 << 13 // has @Contended annotation 248 }; 249 u2 shared_loader_type_bits() const { 250 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class; 251 } 252 u2 _misc_flags; // There is more space in access_flags for more flags. 253 254 Monitor* _init_monitor; // mutual exclusion to _init_state and _init_thread. 255 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization) 256 257 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 258 JNIid* _jni_ids; // First JNI identifier for static fields in this class 259 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 260 nmethodBucket* volatile _dep_context; // packed DependencyContext structure 261 uint64_t volatile _dep_context_last_cleaned; 262 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 263 #if INCLUDE_JVMTI 264 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 265 // Linked instanceKlasses of previous versions 266 InstanceKlass* _previous_versions; 267 // JVMTI fields can be moved to their own structure - see 6315920 268 // JVMTI: cached class file, before retransformable agent modified it in CFLH 269 JvmtiCachedClassFileData* _cached_class_file; 270 #endif 271 272 #if INCLUDE_JVMTI 273 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 274 #endif 275 276 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 277 278 // Method array. 279 Array<Method*>* _methods; 280 // Default Method Array, concrete methods inherited from interfaces 281 Array<Method*>* _default_methods; 282 // Interfaces (InstanceKlass*s) this class declares locally to implement. 283 Array<InstanceKlass*>* _local_interfaces; 284 // Interfaces (InstanceKlass*s) this class implements transitively. 285 Array<InstanceKlass*>* _transitive_interfaces; 286 // Int array containing the original order of method in the class file (for JVMTI). 287 Array<int>* _method_ordering; 288 // Int array containing the vtable_indices for default_methods 289 // offset matches _default_methods offset 290 Array<int>* _default_vtable_indices; 291 292 // Instance and static variable information, starts with 6-tuples of shorts 293 // [access, name index, sig index, initval index, low_offset, high_offset] 294 // for all fields, followed by the generic signature data at the end of 295 // the array. Only fields with generic signature attributes have the generic 296 // signature data set in the array. The fields array looks like following: 297 // 298 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 299 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 300 // ... 301 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 302 // [generic signature index] 303 // [generic signature index] 304 // ... 305 Array<u2>* _fields; 306 307 // embedded Java vtable follows here 308 // embedded Java itables follows here 309 // embedded static fields follows here 310 // embedded nonstatic oop-map blocks follows here 311 // embedded implementor of this interface follows here 312 // The embedded implementor only exists if the current klass is an 313 // interface. The possible values of the implementor fall into following 314 // three cases: 315 // NULL: no implementor. 316 // A Klass* that's not itself: one implementor. 317 // Itself: more than one implementors. 318 // 319 320 friend class SystemDictionary; 321 322 static bool _disable_method_binary_search; 323 324 // Controls finalizer registration 325 static bool _finalization_enabled; 326 327 public: 328 329 // Queries finalization state 330 static bool is_finalization_enabled() { return _finalization_enabled; } 331 332 // Sets finalization state 333 static void set_finalization_enabled(bool val) { _finalization_enabled = val; } 334 335 // The three BUILTIN class loader types 336 bool is_shared_boot_class() const { 337 return (_misc_flags & _misc_is_shared_boot_class) != 0; 338 } 339 bool is_shared_platform_class() const { 340 return (_misc_flags & _misc_is_shared_platform_class) != 0; 341 } 342 bool is_shared_app_class() const { 343 return (_misc_flags & _misc_is_shared_app_class) != 0; 344 } 345 // The UNREGISTERED class loader type 346 bool is_shared_unregistered_class() const { 347 return (_misc_flags & shared_loader_type_bits()) == 0; 348 } 349 350 // Check if the class can be shared in CDS 351 bool is_shareable() const; 352 353 bool shared_loading_failed() const { 354 return (_misc_flags & _misc_shared_loading_failed) != 0; 355 } 356 357 void set_shared_loading_failed() { 358 _misc_flags |= _misc_shared_loading_failed; 359 } 360 361 void set_shared_class_loader_type(s2 loader_type); 362 363 void assign_class_loader_type(); 364 365 bool has_nonstatic_fields() const { 366 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 367 } 368 void set_has_nonstatic_fields(bool b) { 369 assert(!has_nonstatic_fields(), "set once"); 370 if (b) { 371 _misc_flags |= _misc_has_nonstatic_fields; 372 } 373 } 374 375 // field sizes 376 int nonstatic_field_size() const { return _nonstatic_field_size; } 377 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 378 379 int static_field_size() const { return _static_field_size; } 380 void set_static_field_size(int size) { _static_field_size = size; } 381 382 int static_oop_field_count() const { return (int)_static_oop_field_count; } 383 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 384 385 int nonstatic_oop_field_count() const { return (int)_nonstatic_oop_field_count; } 386 void set_nonstatic_oop_field_count(u2 size) { _nonstatic_oop_field_count = size; } 387 388 // Java itable 389 int itable_length() const { return _itable_len; } 390 void set_itable_length(int len) { _itable_len = len; } 391 392 // array klasses 393 ObjArrayKlass* array_klasses() const { return _array_klasses; } 394 inline ObjArrayKlass* array_klasses_acquire() const; // load with acquire semantics 395 inline void release_set_array_klasses(ObjArrayKlass* k); // store with release semantics 396 397 // methods 398 Array<Method*>* methods() const { return _methods; } 399 void set_methods(Array<Method*>* a) { _methods = a; } 400 Method* method_with_idnum(int idnum); 401 Method* method_with_orig_idnum(int idnum); 402 Method* method_with_orig_idnum(int idnum, int version); 403 404 // method ordering 405 Array<int>* method_ordering() const { return _method_ordering; } 406 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 407 void copy_method_ordering(const intArray* m, TRAPS); 408 409 // default_methods 410 Array<Method*>* default_methods() const { return _default_methods; } 411 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 412 413 // default method vtable_indices 414 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 415 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 416 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 417 418 // interfaces 419 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; } 420 void set_local_interfaces(Array<InstanceKlass*>* a) { 421 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 422 _local_interfaces = a; } 423 424 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; } 425 void set_transitive_interfaces(Array<InstanceKlass*>* a) { 426 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 427 _transitive_interfaces = a; 428 } 429 430 private: 431 friend class fieldDescriptor; 432 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 433 434 public: 435 int field_offset (int index) const { return field(index)->offset(); } 436 int field_access_flags(int index) const { return field(index)->access_flags(); } 437 Symbol* field_name (int index) const { return field(index)->name(constants()); } 438 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 439 440 // Number of Java declared fields 441 int java_fields_count() const { return (int)_java_fields_count; } 442 443 Array<u2>* fields() const { return _fields; } 444 void set_fields(Array<u2>* f, u2 java_fields_count) { 445 guarantee(_fields == NULL || f == NULL, "Just checking"); 446 _fields = f; 447 _java_fields_count = java_fields_count; 448 } 449 450 // inner classes 451 Array<u2>* inner_classes() const { return _inner_classes; } 452 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 453 454 // nest members 455 Array<u2>* nest_members() const { return _nest_members; } 456 void set_nest_members(Array<u2>* m) { _nest_members = m; } 457 458 // nest-host index 459 jushort nest_host_index() const { return _nest_host_index; } 460 void set_nest_host_index(u2 i) { _nest_host_index = i; } 461 // dynamic nest member support 462 void set_nest_host(InstanceKlass* host); 463 464 // record components 465 Array<RecordComponent*>* record_components() const { return _record_components; } 466 void set_record_components(Array<RecordComponent*>* record_components) { 467 _record_components = record_components; 468 } 469 bool is_record() const; 470 471 // permitted subclasses 472 Array<u2>* permitted_subclasses() const { return _permitted_subclasses; } 473 void set_permitted_subclasses(Array<u2>* s) { _permitted_subclasses = s; } 474 475 private: 476 // Called to verify that k is a member of this nest - does not look at k's nest-host, 477 // nor does it resolve any CP entries or load any classes. 478 bool has_nest_member(JavaThread* current, InstanceKlass* k) const; 479 480 public: 481 // Call this only if you know that the nest host has been initialized. 482 InstanceKlass* nest_host_not_null() { 483 assert(_nest_host != NULL, "must be"); 484 return _nest_host; 485 } 486 // Used to construct informative IllegalAccessError messages at a higher level, 487 // if there was an issue resolving or validating the nest host. 488 // Returns NULL if there was no error. 489 const char* nest_host_error(); 490 // Returns nest-host class, resolving and validating it if needed. 491 // Returns NULL if resolution is not possible from the calling context. 492 InstanceKlass* nest_host(TRAPS); 493 // Check if this klass is a nestmate of k - resolves this nest-host and k's 494 bool has_nestmate_access_to(InstanceKlass* k, TRAPS); 495 496 // Called to verify that k is a permitted subclass of this class 497 bool has_as_permitted_subclass(const InstanceKlass* k) const; 498 499 enum InnerClassAttributeOffset { 500 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 501 inner_class_inner_class_info_offset = 0, 502 inner_class_outer_class_info_offset = 1, 503 inner_class_inner_name_offset = 2, 504 inner_class_access_flags_offset = 3, 505 inner_class_next_offset = 4 506 }; 507 508 enum EnclosingMethodAttributeOffset { 509 enclosing_method_class_index_offset = 0, 510 enclosing_method_method_index_offset = 1, 511 enclosing_method_attribute_size = 2 512 }; 513 514 // package 515 PackageEntry* package() const { return _package_entry; } 516 ModuleEntry* module() const; 517 bool in_unnamed_package() const { return (_package_entry == NULL); } 518 void set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS); 519 // If the package for the InstanceKlass is in the boot loader's package entry 520 // table then sets the classpath_index field so that 521 // get_system_package() will know to return a non-null value for the 522 // package's location. And, so that the package will be added to the list of 523 // packages returned by get_system_packages(). 524 // For packages whose classes are loaded from the boot loader class path, the 525 // classpath_index indicates which entry on the boot loader class path. 526 void set_classpath_index(s2 path_index); 527 bool is_same_class_package(const Klass* class2) const; 528 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const; 529 530 // find an enclosing class 531 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 532 533 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 534 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 535 536 private: 537 // Check prohibited package ("java/" only loadable by boot or platform loaders) 538 static void check_prohibited_package(Symbol* class_name, 539 ClassLoaderData* loader_data, 540 TRAPS); 541 public: 542 // initialization state 543 bool is_loaded() const { return init_state() >= loaded; } 544 bool is_linked() const { return init_state() >= linked; } 545 bool is_being_linked() const { return init_state() == being_linked; } 546 bool is_initialized() const { return init_state() == fully_initialized; } 547 bool is_not_initialized() const { return init_state() < being_initialized; } 548 bool is_being_initialized() const { return init_state() == being_initialized; } 549 bool is_in_error_state() const { return init_state() == initialization_error; } 550 bool is_init_thread(Thread *thread) { return thread == _init_thread; } 551 ClassState init_state() const { return Atomic::load(&_init_state); } 552 const char* init_state_name() const; 553 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 554 555 class LockLinkState : public StackObj { 556 InstanceKlass* _ik; 557 JavaThread* _current; 558 public: 559 LockLinkState(InstanceKlass* ik, JavaThread* current) : _ik(ik), _current(current) { 560 ik->check_link_state_and_wait(current); 561 } 562 ~LockLinkState() { 563 if (!_ik->is_linked()) { 564 // Reset to loaded if linking failed. 565 _ik->set_initialization_state_and_notify(loaded, _current); 566 } 567 } 568 }; 569 570 // is this a sealed class 571 bool is_sealed() const; 572 573 // defineClass specified verification 574 bool should_verify_class() const { 575 return (_misc_flags & _misc_should_verify_class) != 0; 576 } 577 void set_should_verify_class(bool value) { 578 assert(!should_verify_class(), "set once"); 579 if (value) { 580 _misc_flags |= _misc_should_verify_class; 581 } 582 } 583 584 // marking 585 bool is_marked_dependent() const { return _is_marked_dependent; } 586 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 587 588 // initialization (virtuals from Klass) 589 bool should_be_initialized() const; // means that initialize should be called 590 void initialize(TRAPS); 591 void link_class(TRAPS); 592 bool link_class_or_fail(TRAPS); // returns false on failure 593 void rewrite_class(TRAPS); 594 void link_methods(TRAPS); 595 Method* class_initializer() const; 596 597 // reference type 598 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 599 600 // this class cp index 601 u2 this_class_index() const { return _this_class_index; } 602 void set_this_class_index(u2 index) { _this_class_index = index; } 603 604 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 605 606 // find local field, returns true if found 607 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 608 // find field in direct superinterfaces, returns the interface in which the field is defined 609 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 610 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 611 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 612 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 613 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 614 615 // find a non-static or static field given its offset within the class. 616 bool contains_field_offset(int offset); 617 618 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 619 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 620 621 private: 622 inline static int quick_search(const Array<Method*>* methods, const Symbol* name); 623 624 public: 625 static void disable_method_binary_search() { 626 _disable_method_binary_search = true; 627 } 628 629 // find a local method (returns NULL if not found) 630 Method* find_method(const Symbol* name, const Symbol* signature) const; 631 static Method* find_method(const Array<Method*>* methods, 632 const Symbol* name, 633 const Symbol* signature); 634 635 // find a local method, but skip static methods 636 Method* find_instance_method(const Symbol* name, const Symbol* signature, 637 PrivateLookupMode private_mode) const; 638 static Method* find_instance_method(const Array<Method*>* methods, 639 const Symbol* name, 640 const Symbol* signature, 641 PrivateLookupMode private_mode); 642 643 // find a local method (returns NULL if not found) 644 Method* find_local_method(const Symbol* name, 645 const Symbol* signature, 646 OverpassLookupMode overpass_mode, 647 StaticLookupMode static_mode, 648 PrivateLookupMode private_mode) const; 649 650 // find a local method from given methods array (returns NULL if not found) 651 static Method* find_local_method(const Array<Method*>* methods, 652 const Symbol* name, 653 const Symbol* signature, 654 OverpassLookupMode overpass_mode, 655 StaticLookupMode static_mode, 656 PrivateLookupMode private_mode); 657 658 // find a local method index in methods or default_methods (returns -1 if not found) 659 static int find_method_index(const Array<Method*>* methods, 660 const Symbol* name, 661 const Symbol* signature, 662 OverpassLookupMode overpass_mode, 663 StaticLookupMode static_mode, 664 PrivateLookupMode private_mode); 665 666 // lookup operation (returns NULL if not found) 667 Method* uncached_lookup_method(const Symbol* name, 668 const Symbol* signature, 669 OverpassLookupMode overpass_mode, 670 PrivateLookupMode private_mode = PrivateLookupMode::find) const; 671 672 // lookup a method in all the interfaces that this class implements 673 // (returns NULL if not found) 674 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 675 676 // lookup a method in local defaults then in all interfaces 677 // (returns NULL if not found) 678 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 679 680 // Find method indices by name. If a method with the specified name is 681 // found the index to the first method is returned, and 'end' is filled in 682 // with the index of first non-name-matching method. If no method is found 683 // -1 is returned. 684 int find_method_by_name(const Symbol* name, int* end) const; 685 static int find_method_by_name(const Array<Method*>* methods, 686 const Symbol* name, int* end); 687 688 // constant pool 689 ConstantPool* constants() const { return _constants; } 690 void set_constants(ConstantPool* c) { _constants = c; } 691 692 // protection domain 693 oop protection_domain() const; 694 695 // signers 696 objArrayOop signers() const; 697 698 bool is_contended() const { 699 return (_misc_flags & _misc_is_contended) != 0; 700 } 701 void set_is_contended(bool value) { 702 assert(!is_contended(), "set once"); 703 if (value) { 704 _misc_flags |= _misc_is_contended; 705 } 706 } 707 708 // source file name 709 Symbol* source_file_name() const { return _constants->source_file_name(); } 710 u2 source_file_name_index() const { return _constants->source_file_name_index(); } 711 void set_source_file_name_index(u2 sourcefile_index) { _constants->set_source_file_name_index(sourcefile_index); } 712 713 // minor and major version numbers of class file 714 u2 minor_version() const { return _constants->minor_version(); } 715 void set_minor_version(u2 minor_version) { _constants->set_minor_version(minor_version); } 716 u2 major_version() const { return _constants->major_version(); } 717 void set_major_version(u2 major_version) { _constants->set_major_version(major_version); } 718 719 // source debug extension 720 const char* source_debug_extension() const { return _source_debug_extension; } 721 void set_source_debug_extension(const char* array, int length); 722 723 // nonstatic oop-map blocks 724 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 725 return oop_map_count * OopMapBlock::size_in_words(); 726 } 727 unsigned int nonstatic_oop_map_count() const { 728 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 729 } 730 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 731 void set_nonstatic_oop_map_size(int words) { 732 _nonstatic_oop_map_size = words; 733 } 734 735 bool has_contended_annotations() const { 736 return ((_misc_flags & _misc_has_contended_annotations) != 0); 737 } 738 void set_has_contended_annotations(bool value) { 739 assert(!has_contended_annotations(), "set once"); 740 if (value) { 741 _misc_flags |= _misc_has_contended_annotations; 742 } 743 } 744 745 #if INCLUDE_JVMTI 746 // Redefinition locking. Class can only be redefined by one thread at a time. 747 // The flag is in access_flags so that it can be set and reset using atomic 748 // operations, and not be reset by other misc_flag settings. 749 bool is_being_redefined() const { 750 return _access_flags.is_being_redefined(); 751 } 752 void set_is_being_redefined(bool value) { 753 if (value) { 754 _access_flags.set_is_being_redefined(); 755 } else { 756 _access_flags.clear_is_being_redefined(); 757 } 758 } 759 760 // RedefineClasses() support for previous versions: 761 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 762 void purge_previous_version_list(); 763 764 InstanceKlass* previous_versions() const { return _previous_versions; } 765 #else 766 InstanceKlass* previous_versions() const { return NULL; } 767 #endif 768 769 InstanceKlass* get_klass_version(int version) { 770 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 771 if (ik->constants()->version() == version) { 772 return ik; 773 } 774 } 775 return NULL; 776 } 777 778 bool has_been_redefined() const { 779 return (_misc_flags & _misc_has_been_redefined) != 0; 780 } 781 void set_has_been_redefined() { 782 _misc_flags |= _misc_has_been_redefined; 783 } 784 785 bool is_scratch_class() const { 786 return (_misc_flags & _misc_is_scratch_class) != 0; 787 } 788 789 void set_is_scratch_class() { 790 _misc_flags |= _misc_is_scratch_class; 791 } 792 793 bool has_resolved_methods() const { 794 return _access_flags.has_resolved_methods(); 795 } 796 797 void set_has_resolved_methods() { 798 _access_flags.set_has_resolved_methods(); 799 } 800 801 public: 802 #if INCLUDE_JVMTI 803 804 void init_previous_versions() { 805 _previous_versions = NULL; 806 } 807 808 private: 809 static bool _has_previous_versions; 810 public: 811 static void purge_previous_versions(InstanceKlass* ik) { 812 if (ik->has_been_redefined()) { 813 ik->purge_previous_version_list(); 814 } 815 } 816 817 static bool has_previous_versions_and_reset(); 818 static bool has_previous_versions() { return _has_previous_versions; } 819 820 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 821 void set_cached_class_file(JvmtiCachedClassFileData *data) { 822 _cached_class_file = data; 823 } 824 JvmtiCachedClassFileData * get_cached_class_file(); 825 jint get_cached_class_file_len(); 826 unsigned char * get_cached_class_file_bytes(); 827 828 // JVMTI: Support for caching of field indices, types, and offsets 829 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 830 _jvmti_cached_class_field_map = descriptor; 831 } 832 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 833 return _jvmti_cached_class_field_map; 834 } 835 #else // INCLUDE_JVMTI 836 837 static void purge_previous_versions(InstanceKlass* ik) { return; }; 838 static bool has_previous_versions_and_reset() { return false; } 839 840 void set_cached_class_file(JvmtiCachedClassFileData *data) { 841 assert(data == NULL, "unexpected call with JVMTI disabled"); 842 } 843 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; } 844 845 #endif // INCLUDE_JVMTI 846 847 bool has_nonstatic_concrete_methods() const { 848 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0; 849 } 850 void set_has_nonstatic_concrete_methods(bool b) { 851 assert(!has_nonstatic_concrete_methods(), "set once"); 852 if (b) { 853 _misc_flags |= _misc_has_nonstatic_concrete_methods; 854 } 855 } 856 857 bool declares_nonstatic_concrete_methods() const { 858 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0; 859 } 860 void set_declares_nonstatic_concrete_methods(bool b) { 861 assert(!declares_nonstatic_concrete_methods(), "set once"); 862 if (b) { 863 _misc_flags |= _misc_declares_nonstatic_concrete_methods; 864 } 865 } 866 867 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 868 inline u2 next_method_idnum(); 869 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 870 871 // generics support 872 Symbol* generic_signature() const { return _constants->generic_signature(); } 873 u2 generic_signature_index() const { return _constants->generic_signature_index(); } 874 void set_generic_signature_index(u2 sig_index) { _constants->set_generic_signature_index(sig_index); } 875 876 u2 enclosing_method_data(int offset) const; 877 u2 enclosing_method_class_index() const { 878 return enclosing_method_data(enclosing_method_class_index_offset); 879 } 880 u2 enclosing_method_method_index() { 881 return enclosing_method_data(enclosing_method_method_index_offset); 882 } 883 void set_enclosing_method_indices(u2 class_index, 884 u2 method_index); 885 886 // jmethodID support 887 jmethodID get_jmethod_id(const methodHandle& method_h); 888 jmethodID get_jmethod_id_fetch_or_update(size_t idnum, 889 jmethodID new_id, jmethodID* new_jmeths, 890 jmethodID* to_dealloc_id_p, 891 jmethodID** to_dealloc_jmeths_p); 892 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 893 size_t *length_p, jmethodID* id_p); 894 void ensure_space_for_methodids(int start_offset = 0); 895 jmethodID jmethod_id_or_null(Method* method); 896 897 // annotations support 898 Annotations* annotations() const { return _annotations; } 899 void set_annotations(Annotations* anno) { _annotations = anno; } 900 901 AnnotationArray* class_annotations() const { 902 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 903 } 904 Array<AnnotationArray*>* fields_annotations() const { 905 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 906 } 907 AnnotationArray* class_type_annotations() const { 908 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 909 } 910 Array<AnnotationArray*>* fields_type_annotations() const { 911 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 912 } 913 // allocation 914 instanceOop allocate_instance(TRAPS); 915 static instanceOop allocate_instance(oop cls, TRAPS); 916 917 // additional member function to return a handle 918 instanceHandle allocate_instance_handle(TRAPS); 919 920 objArrayOop allocate_objArray(int n, int length, TRAPS); 921 // Helper function 922 static instanceOop register_finalizer(instanceOop i, TRAPS); 923 924 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 925 // if not, throw either an Error or an Exception. 926 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 927 928 // initialization 929 void call_class_initializer(TRAPS); 930 void set_initialization_state_and_notify(ClassState state, JavaThread* current); 931 932 // OopMapCache support 933 OopMapCache* oop_map_cache() { return _oop_map_cache; } 934 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 935 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 936 937 // JNI identifier support (for static fields - for jni performance) 938 JNIid* jni_ids() { return _jni_ids; } 939 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 940 JNIid* jni_id_for(int offset); 941 942 // maintenance of deoptimization dependencies 943 inline DependencyContext dependencies(); 944 int mark_dependent_nmethods(KlassDepChange& changes); 945 void add_dependent_nmethod(nmethod* nm); 946 void remove_dependent_nmethod(nmethod* nm); 947 void clean_dependency_context(); 948 949 // On-stack replacement support 950 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 951 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 952 void add_osr_nmethod(nmethod* n); 953 bool remove_osr_nmethod(nmethod* n); 954 int mark_osr_nmethods(const Method* m); 955 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 956 957 #if INCLUDE_JVMTI 958 // Breakpoint support (see methods on Method* for details) 959 BreakpointInfo* breakpoints() const { return _breakpoints; }; 960 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 961 #endif 962 963 // support for stub routines 964 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 965 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;) 966 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 967 968 // subclass/subinterface checks 969 bool implements_interface(Klass* k) const; 970 bool is_same_or_direct_interface(Klass* k) const; 971 972 #ifdef ASSERT 973 // check whether this class or one of its superclasses was redefined 974 bool has_redefined_this_or_super() const; 975 #endif 976 977 // Access to the implementor of an interface. 978 InstanceKlass* implementor() const; 979 void set_implementor(InstanceKlass* ik); 980 int nof_implementors() const; 981 void add_implementor(InstanceKlass* ik); // ik is a new class that implements this interface 982 void init_implementor(); // initialize 983 984 // link this class into the implementors list of every interface it implements 985 void process_interfaces(); 986 987 // virtual operations from Klass 988 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 989 Array<InstanceKlass*>* transitive_interfaces); 990 bool can_be_primary_super_slow() const; 991 size_t oop_size(oop obj) const { return size_helper(); } 992 // slow because it's a virtual call and used for verifying the layout_helper. 993 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 994 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 995 996 // Iterators 997 void do_local_static_fields(FieldClosure* cl); 998 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 999 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 1000 void print_nonstatic_fields(FieldClosure* cl); // including inherited and injected fields 1001 1002 void methods_do(void f(Method* method)); 1003 1004 static InstanceKlass* cast(Klass* k) { 1005 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 1006 } 1007 1008 static const InstanceKlass* cast(const Klass* k) { 1009 assert(k != NULL, "k should not be null"); 1010 assert(k->is_instance_klass(), "cast to InstanceKlass"); 1011 return static_cast<const InstanceKlass*>(k); 1012 } 1013 1014 virtual InstanceKlass* java_super() const { 1015 return (super() == NULL) ? NULL : cast(super()); 1016 } 1017 1018 // Sizing (in words) 1019 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 1020 1021 static int size(int vtable_length, int itable_length, 1022 int nonstatic_oop_map_size, 1023 bool is_interface) { 1024 return align_metadata_size(header_size() + 1025 vtable_length + 1026 itable_length + 1027 nonstatic_oop_map_size + 1028 (is_interface ? (int)sizeof(Klass*)/wordSize : 0)); 1029 } 1030 1031 int size() const { return size(vtable_length(), 1032 itable_length(), 1033 nonstatic_oop_map_size(), 1034 is_interface()); 1035 } 1036 1037 1038 inline intptr_t* start_of_itable() const; 1039 inline intptr_t* end_of_itable() const; 1040 inline int itable_offset_in_words() const; 1041 inline oop static_field_base_raw(); 1042 1043 inline OopMapBlock* start_of_nonstatic_oop_maps() const; 1044 inline Klass** end_of_nonstatic_oop_maps() const; 1045 1046 inline InstanceKlass* volatile* adr_implementor() const; 1047 1048 // Use this to return the size of an instance in heap words: 1049 int size_helper() const { 1050 return layout_helper_to_size_helper(layout_helper()); 1051 } 1052 1053 // This bit is initialized in classFileParser.cpp. 1054 // It is false under any of the following conditions: 1055 // - the class is abstract (including any interface) 1056 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1057 // - the class size is larger than FastAllocateSizeLimit 1058 // - the class is java/lang/Class, which cannot be allocated directly 1059 bool can_be_fastpath_allocated() const { 1060 return !layout_helper_needs_slow_path(layout_helper()); 1061 } 1062 1063 // Java itable 1064 klassItable itable() const; // return klassItable wrapper 1065 Method* method_at_itable(InstanceKlass* holder, int index, TRAPS); 1066 Method* method_at_itable_or_null(InstanceKlass* holder, int index, bool& itable_entry_found); 1067 int vtable_index_of_interface_method(Method* method); 1068 1069 #if INCLUDE_JVMTI 1070 void adjust_default_methods(bool* trace_name_printed); 1071 #endif // INCLUDE_JVMTI 1072 1073 void clean_weak_instanceklass_links(); 1074 private: 1075 void clean_implementors_list(); 1076 void clean_method_data(); 1077 1078 public: 1079 // Explicit metaspace deallocation of fields 1080 // For RedefineClasses and class file parsing errors, we need to deallocate 1081 // instanceKlasses and the metadata they point to. 1082 void deallocate_contents(ClassLoaderData* loader_data); 1083 static void deallocate_methods(ClassLoaderData* loader_data, 1084 Array<Method*>* methods); 1085 void static deallocate_interfaces(ClassLoaderData* loader_data, 1086 const Klass* super_klass, 1087 Array<InstanceKlass*>* local_interfaces, 1088 Array<InstanceKlass*>* transitive_interfaces); 1089 void static deallocate_record_components(ClassLoaderData* loader_data, 1090 Array<RecordComponent*>* record_component); 1091 1092 // The constant pool is on stack if any of the methods are executing or 1093 // referenced by handles. 1094 bool on_stack() const { return _constants->on_stack(); } 1095 1096 // callbacks for actions during class unloading 1097 static void unload_class(InstanceKlass* ik); 1098 1099 virtual void release_C_heap_structures(bool release_constant_pool = true); 1100 1101 // Naming 1102 const char* signature_name() const; 1103 1104 // Oop fields (and metadata) iterators 1105 // 1106 // The InstanceKlass iterators also visits the Object's klass. 1107 1108 // Forward iteration 1109 public: 1110 // Iterate over all oop fields in the oop maps. 1111 template <typename T, class OopClosureType> 1112 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1113 1114 // Iterate over all oop fields and metadata. 1115 template <typename T, class OopClosureType> 1116 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 1117 1118 // Iterate over all oop fields in one oop map. 1119 template <typename T, class OopClosureType> 1120 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1121 1122 1123 // Reverse iteration 1124 // Iterate over all oop fields and metadata. 1125 template <typename T, class OopClosureType> 1126 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1127 1128 private: 1129 // Iterate over all oop fields in the oop maps. 1130 template <typename T, class OopClosureType> 1131 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1132 1133 // Iterate over all oop fields in one oop map. 1134 template <typename T, class OopClosureType> 1135 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1136 1137 1138 // Bounded range iteration 1139 public: 1140 // Iterate over all oop fields in the oop maps. 1141 template <typename T, class OopClosureType> 1142 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1143 1144 // Iterate over all oop fields and metadata. 1145 template <typename T, class OopClosureType> 1146 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1147 1148 private: 1149 // Iterate over all oop fields in one oop map. 1150 template <typename T, class OopClosureType> 1151 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1152 1153 1154 public: 1155 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1156 1157 private: 1158 // initialization state 1159 void set_init_state(ClassState state); 1160 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1161 void set_init_thread(Thread *thread) { 1162 assert(thread == nullptr || _init_thread == nullptr, "Only one thread is allowed to own initialization"); 1163 _init_thread = thread; 1164 } 1165 1166 // The RedefineClasses() API can cause new method idnums to be needed 1167 // which will cause the caches to grow. Safety requires different 1168 // cache management logic if the caches can grow instead of just 1169 // going from NULL to non-NULL. 1170 bool idnum_can_increment() const { return has_been_redefined(); } 1171 inline jmethodID* methods_jmethod_ids_acquire() const; 1172 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1173 1174 // Lock during initialization 1175 public: 1176 // Returns the array class for the n'th dimension 1177 virtual Klass* array_klass(int n, TRAPS); 1178 virtual Klass* array_klass_or_null(int n); 1179 1180 // Returns the array class with this class as element type 1181 virtual Klass* array_klass(TRAPS); 1182 virtual Klass* array_klass_or_null(); 1183 1184 static void clean_initialization_error_table(); 1185 1186 Monitor* init_monitor() const { return _init_monitor; } 1187 private: 1188 void check_link_state_and_wait(JavaThread* current); 1189 bool link_class_impl (TRAPS); 1190 bool verify_code (TRAPS); 1191 void initialize_impl (TRAPS); 1192 void initialize_super_interfaces (TRAPS); 1193 1194 void add_initialization_error(JavaThread* current, Handle exception); 1195 oop get_initialization_error(JavaThread* current); 1196 1197 // find a local method (returns NULL if not found) 1198 Method* find_method_impl(const Symbol* name, 1199 const Symbol* signature, 1200 OverpassLookupMode overpass_mode, 1201 StaticLookupMode static_mode, 1202 PrivateLookupMode private_mode) const; 1203 1204 static Method* find_method_impl(const Array<Method*>* methods, 1205 const Symbol* name, 1206 const Symbol* signature, 1207 OverpassLookupMode overpass_mode, 1208 StaticLookupMode static_mode, 1209 PrivateLookupMode private_mode); 1210 1211 #if INCLUDE_JVMTI 1212 // RedefineClasses support 1213 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1214 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1215 #endif 1216 // log class name to classlist 1217 void log_to_classlist() const; 1218 public: 1219 // CDS support - remove and restore oops from metadata. Oops are not shared. 1220 virtual void remove_unshareable_info(); 1221 virtual void remove_java_mirror(); 1222 void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, PackageEntry* pkg_entry, TRAPS); 1223 void init_shared_package_entry(); 1224 bool can_be_verified_at_dumptime() const; 1225 1226 jint compute_modifier_flags() const; 1227 1228 public: 1229 // JVMTI support 1230 jint jvmti_class_status() const; 1231 1232 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1233 1234 public: 1235 // Printing 1236 void print_on(outputStream* st) const; 1237 void print_value_on(outputStream* st) const; 1238 1239 void oop_print_value_on(oop obj, outputStream* st); 1240 1241 void oop_print_on (oop obj, outputStream* st); 1242 1243 #ifndef PRODUCT 1244 void print_dependent_nmethods(bool verbose = false); 1245 bool is_dependent_nmethod(nmethod* nm); 1246 bool verify_itable_index(int index); 1247 #endif 1248 1249 const char* internal_name() const; 1250 1251 // Verification 1252 void verify_on(outputStream* st); 1253 1254 void oop_verify_on(oop obj, outputStream* st); 1255 1256 // Logging 1257 void print_class_load_logging(ClassLoaderData* loader_data, 1258 const ModuleEntry* module_entry, 1259 const ClassFileStream* cfs) const; 1260 }; 1261 1262 // for adding methods 1263 // UNSET_IDNUM return means no more ids available 1264 inline u2 InstanceKlass::next_method_idnum() { 1265 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1266 return ConstMethod::UNSET_IDNUM; // no more ids available 1267 } else { 1268 return _idnum_allocated_count++; 1269 } 1270 } 1271 1272 class PrintClassClosure : public KlassClosure { 1273 private: 1274 outputStream* _st; 1275 bool _verbose; 1276 public: 1277 PrintClassClosure(outputStream* st, bool verbose); 1278 1279 void do_klass(Klass* k); 1280 }; 1281 1282 /* JNIid class for jfieldIDs only */ 1283 class JNIid: public CHeapObj<mtClass> { 1284 friend class VMStructs; 1285 private: 1286 Klass* _holder; 1287 JNIid* _next; 1288 int _offset; 1289 #ifdef ASSERT 1290 bool _is_static_field_id; 1291 #endif 1292 1293 public: 1294 // Accessors 1295 Klass* holder() const { return _holder; } 1296 int offset() const { return _offset; } 1297 JNIid* next() { return _next; } 1298 // Constructor 1299 JNIid(Klass* holder, int offset, JNIid* next); 1300 // Identifier lookup 1301 JNIid* find(int offset); 1302 1303 bool find_local_field(fieldDescriptor* fd) { 1304 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1305 } 1306 1307 static void deallocate(JNIid* id); 1308 // Debugging 1309 #ifdef ASSERT 1310 bool is_static_field_id() const { return _is_static_field_id; } 1311 void set_is_static_field_id() { _is_static_field_id = true; } 1312 #endif 1313 void verify(Klass* holder); 1314 }; 1315 1316 // An iterator that's used to access the inner classes indices in the 1317 // InstanceKlass::_inner_classes array. 1318 class InnerClassesIterator : public StackObj { 1319 private: 1320 Array<jushort>* _inner_classes; 1321 int _length; 1322 int _idx; 1323 public: 1324 1325 InnerClassesIterator(const InstanceKlass* k) { 1326 _inner_classes = k->inner_classes(); 1327 if (k->inner_classes() != NULL) { 1328 _length = _inner_classes->length(); 1329 // The inner class array's length should be the multiple of 1330 // inner_class_next_offset if it only contains the InnerClasses 1331 // attribute data, or it should be 1332 // n*inner_class_next_offset+enclosing_method_attribute_size 1333 // if it also contains the EnclosingMethod data. 1334 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1335 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1336 "just checking"); 1337 // Remove the enclosing_method portion if exists. 1338 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1339 _length -= InstanceKlass::enclosing_method_attribute_size; 1340 } 1341 } else { 1342 _length = 0; 1343 } 1344 _idx = 0; 1345 } 1346 1347 int length() const { 1348 return _length; 1349 } 1350 1351 void next() { 1352 _idx += InstanceKlass::inner_class_next_offset; 1353 } 1354 1355 bool done() const { 1356 return (_idx >= _length); 1357 } 1358 1359 u2 inner_class_info_index() const { 1360 return _inner_classes->at( 1361 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1362 } 1363 1364 void set_inner_class_info_index(u2 index) { 1365 _inner_classes->at_put( 1366 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1367 } 1368 1369 u2 outer_class_info_index() const { 1370 return _inner_classes->at( 1371 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1372 } 1373 1374 void set_outer_class_info_index(u2 index) { 1375 _inner_classes->at_put( 1376 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1377 } 1378 1379 u2 inner_name_index() const { 1380 return _inner_classes->at( 1381 _idx + InstanceKlass::inner_class_inner_name_offset); 1382 } 1383 1384 void set_inner_name_index(u2 index) { 1385 _inner_classes->at_put( 1386 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1387 } 1388 1389 u2 inner_access_flags() const { 1390 return _inner_classes->at( 1391 _idx + InstanceKlass::inner_class_access_flags_offset); 1392 } 1393 }; 1394 1395 // Iterator over class hierarchy under a particular class. Implements depth-first pre-order traversal. 1396 // Usage: 1397 // for (ClassHierarchyIterator iter(root_klass); !iter.done(); iter.next()) { 1398 // Klass* k = iter.klass(); 1399 // ... 1400 // } 1401 class ClassHierarchyIterator : public StackObj { 1402 private: 1403 InstanceKlass* _root; 1404 Klass* _current; 1405 bool _visit_subclasses; 1406 1407 public: 1408 ClassHierarchyIterator(InstanceKlass* root) : _root(root), _current(root), _visit_subclasses(true) { 1409 assert(_root == _current, "required"); // initial state 1410 } 1411 1412 bool done() { 1413 return (_current == NULL); 1414 } 1415 1416 // Make a step iterating over the class hierarchy under the root class. 1417 // Skips subclasses if requested. 1418 void next(); 1419 1420 Klass* klass() { 1421 assert(!done(), "sanity"); 1422 return _current; 1423 } 1424 1425 // Skip subclasses of the current class. 1426 void skip_subclasses() { 1427 _visit_subclasses = false; 1428 } 1429 }; 1430 1431 #endif // SHARE_OOPS_INSTANCEKLASS_HPP