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 "code/vmreg.hpp" 29 #include "memory/referenceType.hpp" 30 #include "oops/annotations.hpp" 31 #include "oops/constMethod.hpp" 32 #include "oops/fieldInfo.hpp" 33 #include "oops/instanceKlassMiscStatus.hpp" 34 #include "oops/instanceOop.hpp" 35 #include "runtime/handles.hpp" 36 #include "utilities/accessFlags.hpp" 37 #include "utilities/align.hpp" 38 #include "utilities/macros.hpp" 39 #if INCLUDE_JFR 40 #include "jfr/support/jfrKlassExtension.hpp" 41 #endif 42 43 class klassItable; 44 class RecordComponent; 45 46 // An InstanceKlass is the VM level representation of a Java class. 47 // It contains all information needed for at class at execution runtime. 48 49 // InstanceKlass embedded field layout (after declared fields): 50 // [EMBEDDED Java vtable ] size in words = vtable_len 51 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size 52 // The embedded nonstatic oop-map blocks are short pairs (offset, length) 53 // indicating where oops are located in instances of this klass. 54 // [EMBEDDED implementor of the interface] only exist for interface 55 // [EMBEDDED inline_type_field_klasses] only if has_inline_fields() == true 56 // [EMBEDDED InlineKlassFixedBlock] only if is an InlineKlass instance 57 58 59 // forward declaration for class -- see below for definition 60 #if INCLUDE_JVMTI 61 class BreakpointInfo; 62 #endif 63 class ClassFileParser; 64 class ClassFileStream; 65 class KlassDepChange; 66 class DependencyContext; 67 class fieldDescriptor; 68 class jniIdMapBase; 69 class JNIid; 70 class JvmtiCachedClassFieldMap; 71 class nmethodBucket; 72 class OopMapCache; 73 class BufferedInlineTypeBlob; 74 class InterpreterOopMap; 75 class PackageEntry; 76 class ModuleEntry; 77 78 // This is used in iterators below. 79 class FieldClosure: public StackObj { 80 public: 81 virtual void do_field(fieldDescriptor* fd) = 0; 82 }; 83 84 // Print fields. 85 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. 86 class FieldPrinter: public FieldClosure { 87 oop _obj; 88 outputStream* _st; 89 public: 90 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} 91 void do_field(fieldDescriptor* fd); 92 }; 93 94 // Describes where oops are located in instances of this klass. 95 class OopMapBlock { 96 public: 97 // Byte offset of the first oop mapped by this block. 98 int offset() const { return _offset; } 99 void set_offset(int offset) { _offset = offset; } 100 101 // Number of oops in this block. 102 uint count() const { return _count; } 103 void set_count(uint count) { _count = count; } 104 105 void increment_count(int diff) { _count += diff; } 106 107 int offset_span() const { return _count * heapOopSize; } 108 109 int end_offset() const { 110 return offset() + offset_span(); 111 } 112 113 bool is_contiguous(int another_offset) const { 114 return another_offset == end_offset(); 115 } 116 117 // sizeof(OopMapBlock) in words. 118 static const int size_in_words() { 119 return align_up((int)sizeof(OopMapBlock), wordSize) >> 120 LogBytesPerWord; 121 } 122 123 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) { 124 return a->offset() - b->offset(); 125 } 126 127 private: 128 int _offset; 129 uint _count; 130 }; 131 132 struct JvmtiCachedClassFileData; 133 134 class SigEntry; 135 136 class InlineKlassFixedBlock { 137 Array<SigEntry>** _extended_sig; 138 Array<VMRegPair>** _return_regs; 139 address* _pack_handler; 140 address* _pack_handler_jobject; 141 address* _unpack_handler; 142 int* _default_value_offset; 143 ArrayKlass** _null_free_inline_array_klasses; 144 int _alignment; 145 int _first_field_offset; 146 int _exact_size_in_bytes; 147 148 friend class InlineKlass; 149 }; 150 151 class InstanceKlass: public Klass { 152 friend class VMStructs; 153 friend class JVMCIVMStructs; 154 friend class ClassFileParser; 155 friend class CompileReplay; 156 friend class TemplateTable; 157 158 public: 159 static const KlassKind Kind = InstanceKlassKind; 160 161 protected: 162 InstanceKlass(const ClassFileParser& parser, KlassKind kind = Kind, ReferenceType reference_type = REF_NONE); 163 164 public: 165 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 166 167 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 168 // of the class loading & initialization procedure, and the use of the states. 169 enum ClassState : u1 { 170 allocated, // allocated (but not yet linked) 171 loaded, // loaded and inserted in class hierarchy (but not linked yet) 172 being_linked, // currently running verifier and rewriter 173 linked, // successfully linked/verified (but not initialized yet) 174 being_initialized, // currently running class initializer 175 fully_initialized, // initialized (successful final state) 176 initialization_error // error happened during initialization 177 }; 178 179 private: 180 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS); 181 182 protected: 183 // If you add a new field that points to any metaspace object, you 184 // must add this field to InstanceKlass::metaspace_pointers_do(). 185 186 // Annotations for this class 187 Annotations* _annotations; 188 // Package this class is defined in 189 PackageEntry* _package_entry; 190 // Array classes holding elements of this class. 191 ArrayKlass* volatile _array_klasses; 192 // Constant pool for this class. 193 ConstantPool* _constants; 194 // The InnerClasses attribute and EnclosingMethod attribute. The 195 // _inner_classes is an array of shorts. If the class has InnerClasses 196 // attribute, then the _inner_classes array begins with 4-tuples of shorts 197 // [inner_class_info_index, outer_class_info_index, 198 // inner_name_index, inner_class_access_flags] for the InnerClasses 199 // attribute. If the EnclosingMethod attribute exists, it occupies the 200 // last two shorts [class_index, method_index] of the array. If only 201 // the InnerClasses attribute exists, the _inner_classes array length is 202 // number_of_inner_classes * 4. If the class has both InnerClasses 203 // and EnclosingMethod attributes the _inner_classes array length is 204 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 205 Array<jushort>* _inner_classes; 206 207 // The NestMembers attribute. An array of shorts, where each is a 208 // class info index for the class that is a nest member. This data 209 // has not been validated. 210 Array<jushort>* _nest_members; 211 212 // Resolved nest-host klass: either true nest-host or self if we are not 213 // nested, or an error occurred resolving or validating the nominated 214 // nest-host. Can also be set directly by JDK API's that establish nest 215 // relationships. 216 // By always being set it makes nest-member access checks simpler. 217 InstanceKlass* _nest_host; 218 219 // The PermittedSubclasses attribute. An array of shorts, where each is a 220 // class info index for the class that is a permitted subclass. 221 Array<jushort>* _permitted_subclasses; 222 223 // The contents of the Record attribute. 224 Array<RecordComponent*>* _record_components; 225 226 // the source debug extension for this klass, NULL if not specified. 227 // Specified as UTF-8 string without terminating zero byte in the classfile, 228 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 229 const char* _source_debug_extension; 230 231 // Number of heapOopSize words used by non-static fields in this klass 232 // (including inherited fields but after header_size()). 233 int _nonstatic_field_size; 234 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 235 int _nonstatic_oop_map_size; // size in words of nonstatic oop map blocks 236 int _itable_len; // length of Java itable (in words) 237 238 // The NestHost attribute. The class info index for the class 239 // that is the nest-host of this class. This data has not been validated. 240 u2 _nest_host_index; 241 u2 _this_class_index; // constant pool entry 242 u2 _static_oop_field_count; // number of static oop fields in this klass 243 u2 _java_fields_count; // The number of declared Java fields 244 245 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 246 247 // _is_marked_dependent can be set concurrently, thus cannot be part of the 248 // _misc_status right now. 249 bool _is_marked_dependent; // used for marking during flushing and deoptimization 250 251 ClassState _init_state; // state of class 252 253 u1 _reference_type; // reference type 254 255 // State is set while executing, eventually atomically to not disturb other state 256 InstanceKlassMiscStatus _misc_status; 257 258 Monitor* _init_monitor; // mutual exclusion to _init_state and _init_thread. 259 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization) 260 261 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 262 JNIid* _jni_ids; // First JNI identifier for static fields in this class 263 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 264 nmethodBucket* volatile _dep_context; // packed DependencyContext structure 265 uint64_t volatile _dep_context_last_cleaned; 266 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 267 #if INCLUDE_JVMTI 268 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 269 // Linked instanceKlasses of previous versions 270 InstanceKlass* _previous_versions; 271 // JVMTI fields can be moved to their own structure - see 6315920 272 // JVMTI: cached class file, before retransformable agent modified it in CFLH 273 JvmtiCachedClassFileData* _cached_class_file; 274 #endif 275 276 #if INCLUDE_JVMTI 277 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 278 #endif 279 280 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 281 282 // Method array. 283 Array<Method*>* _methods; 284 // Default Method Array, concrete methods inherited from interfaces 285 Array<Method*>* _default_methods; 286 // Interfaces (InstanceKlass*s) this class declares locally to implement. 287 Array<InstanceKlass*>* _local_interfaces; 288 // Interfaces (InstanceKlass*s) this class implements transitively. 289 Array<InstanceKlass*>* _transitive_interfaces; 290 // Int array containing the original order of method in the class file (for JVMTI). 291 Array<int>* _method_ordering; 292 // Int array containing the vtable_indices for default_methods 293 // offset matches _default_methods offset 294 Array<int>* _default_vtable_indices; 295 296 // Instance and static variable information, starts with 6-tuples of shorts 297 // [access, name index, sig index, initval index, low_offset, high_offset] 298 // for all fields, followed by the generic signature data at the end of 299 // the array. Only fields with generic signature attributes have the generic 300 // signature data set in the array. The fields array looks like following: 301 // 302 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 303 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 304 // ... 305 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 306 // [generic signature index] 307 // [generic signature index] 308 // ... 309 Array<u2>* _fields; 310 const Klass** _inline_type_field_klasses; // For "inline class" fields, NULL if none present 311 Array<u2>* _preload_classes; 312 const InlineKlassFixedBlock* _adr_inlineklass_fixed_block; 313 314 // embedded Java vtable follows here 315 // embedded Java itables follows here 316 // embedded static fields follows here 317 // embedded nonstatic oop-map blocks follows here 318 // embedded implementor of this interface follows here 319 // The embedded implementor only exists if the current klass is an 320 // interface. The possible values of the implementor fall into following 321 // three cases: 322 // NULL: no implementor. 323 // A Klass* that's not itself: one implementor. 324 // Itself: more than one implementors. 325 // 326 327 friend class SystemDictionary; 328 329 static bool _disable_method_binary_search; 330 331 // Controls finalizer registration 332 static bool _finalization_enabled; 333 334 public: 335 336 // Queries finalization state 337 static bool is_finalization_enabled() { return _finalization_enabled; } 338 339 // Sets finalization state 340 static void set_finalization_enabled(bool val) { _finalization_enabled = val; } 341 342 // The three BUILTIN class loader types 343 bool is_shared_boot_class() const { return _misc_status.is_shared_boot_class(); } 344 bool is_shared_platform_class() const { return _misc_status.is_shared_platform_class(); } 345 bool is_shared_app_class() const { return _misc_status.is_shared_app_class(); } 346 // The UNREGISTERED class loader type 347 bool is_shared_unregistered_class() const { return _misc_status.is_shared_unregistered_class(); } 348 349 // Check if the class can be shared in CDS 350 bool is_shareable() const; 351 352 bool shared_loading_failed() const { return _misc_status.shared_loading_failed(); } 353 354 void set_shared_loading_failed() { _misc_status.set_shared_loading_failed(true); } 355 356 #if INCLUDE_CDS 357 void set_shared_class_loader_type(s2 loader_type) { _misc_status.set_shared_class_loader_type(loader_type); } 358 void assign_class_loader_type() { _misc_status.assign_class_loader_type(_class_loader_data); } 359 #endif 360 361 bool has_nonstatic_fields() const { return _misc_status.has_nonstatic_fields(); } 362 void set_has_nonstatic_fields(bool b) { _misc_status.set_has_nonstatic_fields(b); } 363 364 bool has_inline_type_fields() const { return _misc_status.has_inline_type_fields(); } 365 void set_has_inline_type_fields() { _misc_status.set_has_inline_type_fields(true); } 366 367 bool is_empty_inline_type() const { return _misc_status.is_empty_inline_type(); } 368 void set_is_empty_inline_type() { _misc_status.set_is_empty_inline_type(true); } 369 370 // Note: The naturally_atomic property only applies to 371 // inline classes; it is never true on identity classes. 372 // The bit is placed on instanceKlass for convenience. 373 374 // Query if h/w provides atomic load/store for instances. 375 bool is_naturally_atomic() const { return _misc_status.is_naturally_atomic(); } 376 void set_is_naturally_atomic() { _misc_status.set_is_naturally_atomic(true); } 377 378 // Query if this class implements jl.NonTearable or was 379 // mentioned in the JVM option ForceNonTearable. 380 // This bit can occur anywhere, but is only significant 381 // for inline classes *and* their super types. 382 // It inherits from supers along with NonTearable. 383 bool is_declared_atomic() const { return _misc_status.is_declared_atomic(); } 384 void set_is_declared_atomic() { _misc_status.set_is_declared_atomic(true); } 385 386 bool carries_value_modifier() const { return _misc_status.carries_value_modifier(); } 387 void set_carries_value_modifier() { _misc_status.set_carries_value_modifier(true); } 388 389 bool carries_identity_modifier() const { return _misc_status.carries_identity_modifier(); } 390 void set_carries_identity_modifier() { _misc_status.set_carries_identity_modifier(true); } 391 392 // field sizes 393 int nonstatic_field_size() const { return _nonstatic_field_size; } 394 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 395 396 int static_field_size() const { return _static_field_size; } 397 void set_static_field_size(int size) { _static_field_size = size; } 398 399 int static_oop_field_count() const { return (int)_static_oop_field_count; } 400 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 401 402 // Java itable 403 int itable_length() const { return _itable_len; } 404 void set_itable_length(int len) { _itable_len = len; } 405 406 // array klasses 407 ArrayKlass* array_klasses() const { return _array_klasses; } 408 inline ArrayKlass* array_klasses_acquire() const; // load with acquire semantics 409 inline void release_set_array_klasses(ArrayKlass* k); // store with release semantics 410 411 // methods 412 Array<Method*>* methods() const { return _methods; } 413 void set_methods(Array<Method*>* a) { _methods = a; } 414 Method* method_with_idnum(int idnum); 415 Method* method_with_orig_idnum(int idnum); 416 Method* method_with_orig_idnum(int idnum, int version); 417 418 // method ordering 419 Array<int>* method_ordering() const { return _method_ordering; } 420 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 421 void copy_method_ordering(const intArray* m, TRAPS); 422 423 // default_methods 424 Array<Method*>* default_methods() const { return _default_methods; } 425 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 426 427 // default method vtable_indices 428 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 429 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 430 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 431 432 // interfaces 433 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; } 434 void set_local_interfaces(Array<InstanceKlass*>* a) { 435 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 436 _local_interfaces = a; } 437 438 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; } 439 void set_transitive_interfaces(Array<InstanceKlass*>* a) { 440 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 441 _transitive_interfaces = a; 442 } 443 444 private: 445 friend class fieldDescriptor; 446 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 447 448 public: 449 int field_offset (int index) const { return field(index)->offset(); } 450 int field_access_flags(int index) const { return field(index)->access_flags(); } 451 Symbol* field_name (int index) const { return field(index)->name(constants()); } 452 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 453 bool field_is_inlined(int index) const { return field(index)->is_inlined(); } 454 bool field_is_null_free_inline_type(int index) const; 455 456 // Number of Java declared fields 457 int java_fields_count() const { return (int)_java_fields_count; } 458 459 Array<u2>* fields() const { return _fields; } 460 void set_fields(Array<u2>* f, u2 java_fields_count) { 461 guarantee(_fields == NULL || f == NULL, "Just checking"); 462 _fields = f; 463 _java_fields_count = java_fields_count; 464 } 465 466 Array<u2>* preload_classes() const { return _preload_classes; } 467 void set_preload_classes(Array<u2>* c) { _preload_classes = c; } 468 469 // inner classes 470 Array<u2>* inner_classes() const { return _inner_classes; } 471 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 472 473 // nest members 474 Array<u2>* nest_members() const { return _nest_members; } 475 void set_nest_members(Array<u2>* m) { _nest_members = m; } 476 477 // nest-host index 478 jushort nest_host_index() const { return _nest_host_index; } 479 void set_nest_host_index(u2 i) { _nest_host_index = i; } 480 // dynamic nest member support 481 void set_nest_host(InstanceKlass* host); 482 483 // record components 484 Array<RecordComponent*>* record_components() const { return _record_components; } 485 void set_record_components(Array<RecordComponent*>* record_components) { 486 _record_components = record_components; 487 } 488 bool is_record() const; 489 490 // permitted subclasses 491 Array<u2>* permitted_subclasses() const { return _permitted_subclasses; } 492 void set_permitted_subclasses(Array<u2>* s) { _permitted_subclasses = s; } 493 494 private: 495 // Called to verify that k is a member of this nest - does not look at k's nest-host, 496 // nor does it resolve any CP entries or load any classes. 497 bool has_nest_member(JavaThread* current, InstanceKlass* k) const; 498 499 public: 500 // Call this only if you know that the nest host has been initialized. 501 InstanceKlass* nest_host_not_null() { 502 assert(_nest_host != NULL, "must be"); 503 return _nest_host; 504 } 505 // Used to construct informative IllegalAccessError messages at a higher level, 506 // if there was an issue resolving or validating the nest host. 507 // Returns NULL if there was no error. 508 const char* nest_host_error(); 509 // Returns nest-host class, resolving and validating it if needed. 510 // Returns NULL if resolution is not possible from the calling context. 511 InstanceKlass* nest_host(TRAPS); 512 // Check if this klass is a nestmate of k - resolves this nest-host and k's 513 bool has_nestmate_access_to(InstanceKlass* k, TRAPS); 514 515 // Called to verify that k is a permitted subclass of this class 516 bool has_as_permitted_subclass(const InstanceKlass* k) const; 517 518 enum InnerClassAttributeOffset { 519 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 520 inner_class_inner_class_info_offset = 0, 521 inner_class_outer_class_info_offset = 1, 522 inner_class_inner_name_offset = 2, 523 inner_class_access_flags_offset = 3, 524 inner_class_next_offset = 4 525 }; 526 527 enum EnclosingMethodAttributeOffset { 528 enclosing_method_class_index_offset = 0, 529 enclosing_method_method_index_offset = 1, 530 enclosing_method_attribute_size = 2 531 }; 532 533 // package 534 PackageEntry* package() const { return _package_entry; } 535 ModuleEntry* module() const; 536 bool in_unnamed_package() const { return (_package_entry == NULL); } 537 void set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS); 538 // If the package for the InstanceKlass is in the boot loader's package entry 539 // table then sets the classpath_index field so that 540 // get_system_package() will know to return a non-null value for the 541 // package's location. And, so that the package will be added to the list of 542 // packages returned by get_system_packages(). 543 // For packages whose classes are loaded from the boot loader class path, the 544 // classpath_index indicates which entry on the boot loader class path. 545 void set_classpath_index(s2 path_index); 546 bool is_same_class_package(const Klass* class2) const; 547 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const; 548 549 // find an enclosing class 550 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 551 552 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 553 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 554 555 private: 556 // Check prohibited package ("java/" only loadable by boot or platform loaders) 557 static void check_prohibited_package(Symbol* class_name, 558 ClassLoaderData* loader_data, 559 TRAPS); 560 public: 561 // initialization state 562 bool is_loaded() const { return init_state() >= loaded; } 563 bool is_linked() const { return init_state() >= linked; } 564 bool is_being_linked() const { return init_state() == being_linked; } 565 bool is_initialized() const { return init_state() == fully_initialized; } 566 bool is_not_initialized() const { return init_state() < being_initialized; } 567 bool is_being_initialized() const { return init_state() == being_initialized; } 568 bool is_in_error_state() const { return init_state() == initialization_error; } 569 bool is_init_thread(Thread *thread) { return thread == _init_thread; } 570 ClassState init_state() const { return Atomic::load(&_init_state); } 571 const char* init_state_name() const; 572 bool is_rewritten() const { return _misc_status.rewritten(); } 573 574 class LockLinkState : public StackObj { 575 InstanceKlass* _ik; 576 JavaThread* _current; 577 public: 578 LockLinkState(InstanceKlass* ik, JavaThread* current) : _ik(ik), _current(current) { 579 ik->check_link_state_and_wait(current); 580 } 581 ~LockLinkState() { 582 if (!_ik->is_linked()) { 583 // Reset to loaded if linking failed. 584 _ik->set_initialization_state_and_notify(loaded, _current); 585 } 586 } 587 }; 588 589 // is this a sealed class 590 bool is_sealed() const; 591 592 // defineClass specified verification 593 bool should_verify_class() const { return _misc_status.should_verify_class(); } 594 void set_should_verify_class(bool value) { _misc_status.set_should_verify_class(value); } 595 596 // marking 597 bool is_marked_dependent() const { return _is_marked_dependent; } 598 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 599 600 static ByteSize kind_offset() { return in_ByteSize(offset_of(InstanceKlass, _kind)); } 601 static ByteSize misc_status_offset() { return in_ByteSize(offset_of(InstanceKlass, _misc_status)); } 602 603 // initialization (virtuals from Klass) 604 bool should_be_initialized() const; // means that initialize should be called 605 void initialize(TRAPS); 606 void link_class(TRAPS); 607 bool link_class_or_fail(TRAPS); // returns false on failure 608 void rewrite_class(TRAPS); 609 void link_methods(TRAPS); 610 Method* class_initializer() const; 611 612 // reference type 613 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 614 615 // this class cp index 616 u2 this_class_index() const { return _this_class_index; } 617 void set_this_class_index(u2 index) { _this_class_index = index; } 618 619 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 620 621 // find local field, returns true if found 622 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 623 // find field in direct superinterfaces, returns the interface in which the field is defined 624 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 625 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 626 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 627 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 628 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 629 630 // find a non-static or static field given its offset within the class. 631 bool contains_field_offset(int offset); 632 633 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 634 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 635 636 private: 637 inline static int quick_search(const Array<Method*>* methods, const Symbol* name); 638 639 public: 640 static void disable_method_binary_search() { 641 _disable_method_binary_search = true; 642 } 643 644 // find a local method (returns NULL if not found) 645 Method* find_method(const Symbol* name, const Symbol* signature) const; 646 static Method* find_method(const Array<Method*>* methods, 647 const Symbol* name, 648 const Symbol* signature); 649 650 // find a local method, but skip static methods 651 Method* find_instance_method(const Symbol* name, const Symbol* signature, 652 PrivateLookupMode private_mode) const; 653 static Method* find_instance_method(const Array<Method*>* methods, 654 const Symbol* name, 655 const Symbol* signature, 656 PrivateLookupMode private_mode); 657 658 // find a local method (returns NULL if not found) 659 Method* find_local_method(const Symbol* name, 660 const Symbol* signature, 661 OverpassLookupMode overpass_mode, 662 StaticLookupMode static_mode, 663 PrivateLookupMode private_mode) const; 664 665 // find a local method from given methods array (returns NULL if not found) 666 static Method* find_local_method(const Array<Method*>* methods, 667 const Symbol* name, 668 const Symbol* signature, 669 OverpassLookupMode overpass_mode, 670 StaticLookupMode static_mode, 671 PrivateLookupMode private_mode); 672 673 // find a local method index in methods or default_methods (returns -1 if not found) 674 static int find_method_index(const Array<Method*>* methods, 675 const Symbol* name, 676 const Symbol* signature, 677 OverpassLookupMode overpass_mode, 678 StaticLookupMode static_mode, 679 PrivateLookupMode private_mode); 680 681 // lookup operation (returns NULL if not found) 682 Method* uncached_lookup_method(const Symbol* name, 683 const Symbol* signature, 684 OverpassLookupMode overpass_mode, 685 PrivateLookupMode private_mode = PrivateLookupMode::find) const; 686 687 // lookup a method in all the interfaces that this class implements 688 // (returns NULL if not found) 689 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 690 691 // lookup a method in local defaults then in all interfaces 692 // (returns NULL if not found) 693 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 694 695 // Find method indices by name. If a method with the specified name is 696 // found the index to the first method is returned, and 'end' is filled in 697 // with the index of first non-name-matching method. If no method is found 698 // -1 is returned. 699 int find_method_by_name(const Symbol* name, int* end) const; 700 static int find_method_by_name(const Array<Method*>* methods, 701 const Symbol* name, int* end); 702 703 // constant pool 704 ConstantPool* constants() const { return _constants; } 705 void set_constants(ConstantPool* c) { _constants = c; } 706 707 // protection domain 708 oop protection_domain() const; 709 710 // signers 711 objArrayOop signers() const; 712 713 bool is_contended() const { return _misc_status.is_contended(); } 714 void set_is_contended(bool value) { _misc_status.set_is_contended(value); } 715 716 // source file name 717 Symbol* source_file_name() const { return _constants->source_file_name(); } 718 u2 source_file_name_index() const { return _constants->source_file_name_index(); } 719 void set_source_file_name_index(u2 sourcefile_index) { _constants->set_source_file_name_index(sourcefile_index); } 720 721 // minor and major version numbers of class file 722 u2 minor_version() const { return _constants->minor_version(); } 723 void set_minor_version(u2 minor_version) { _constants->set_minor_version(minor_version); } 724 u2 major_version() const { return _constants->major_version(); } 725 void set_major_version(u2 major_version) { _constants->set_major_version(major_version); } 726 727 // source debug extension 728 const char* source_debug_extension() const { return _source_debug_extension; } 729 void set_source_debug_extension(const char* array, int length); 730 731 // nonstatic oop-map blocks 732 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 733 return oop_map_count * OopMapBlock::size_in_words(); 734 } 735 unsigned int nonstatic_oop_map_count() const { 736 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 737 } 738 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 739 void set_nonstatic_oop_map_size(int words) { 740 _nonstatic_oop_map_size = words; 741 } 742 743 bool has_contended_annotations() const { return _misc_status.has_contended_annotations(); } 744 void set_has_contended_annotations(bool value) { _misc_status.set_has_contended_annotations(value); } 745 746 #if INCLUDE_JVMTI 747 // Redefinition locking. Class can only be redefined by one thread at a time. 748 // The flag is in access_flags so that it can be set and reset using atomic 749 // operations, and not be reset by other misc_flag settings. 750 bool is_being_redefined() const { 751 return _access_flags.is_being_redefined(); 752 } 753 void set_is_being_redefined(bool value) { 754 if (value) { 755 _access_flags.set_is_being_redefined(); 756 } else { 757 _access_flags.clear_is_being_redefined(); 758 } 759 } 760 761 // RedefineClasses() support for previous versions: 762 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 763 void purge_previous_version_list(); 764 765 InstanceKlass* previous_versions() const { return _previous_versions; } 766 #else 767 InstanceKlass* previous_versions() const { return NULL; } 768 #endif 769 770 InstanceKlass* get_klass_version(int version) { 771 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 772 if (ik->constants()->version() == version) { 773 return ik; 774 } 775 } 776 return NULL; 777 } 778 779 bool has_been_redefined() const { return _misc_status.has_been_redefined(); } 780 void set_has_been_redefined() { _misc_status.set_has_been_redefined(true); } 781 782 bool is_scratch_class() const { return _misc_status.is_scratch_class(); } 783 void set_is_scratch_class() { _misc_status.set_is_scratch_class(true); } 784 785 bool has_resolved_methods() const { 786 return _access_flags.has_resolved_methods(); 787 } 788 789 void set_has_resolved_methods() { 790 _access_flags.set_has_resolved_methods(); 791 } 792 793 public: 794 #if INCLUDE_JVMTI 795 796 void init_previous_versions() { 797 _previous_versions = NULL; 798 } 799 800 private: 801 static bool _has_previous_versions; 802 public: 803 static void purge_previous_versions(InstanceKlass* ik) { 804 if (ik->has_been_redefined()) { 805 ik->purge_previous_version_list(); 806 } 807 } 808 809 static bool has_previous_versions_and_reset(); 810 static bool has_previous_versions() { return _has_previous_versions; } 811 812 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 813 void set_cached_class_file(JvmtiCachedClassFileData *data) { 814 _cached_class_file = data; 815 } 816 JvmtiCachedClassFileData * get_cached_class_file(); 817 jint get_cached_class_file_len(); 818 unsigned char * get_cached_class_file_bytes(); 819 820 // JVMTI: Support for caching of field indices, types, and offsets 821 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 822 _jvmti_cached_class_field_map = descriptor; 823 } 824 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 825 return _jvmti_cached_class_field_map; 826 } 827 #else // INCLUDE_JVMTI 828 829 static void purge_previous_versions(InstanceKlass* ik) { return; }; 830 static bool has_previous_versions_and_reset() { return false; } 831 832 void set_cached_class_file(JvmtiCachedClassFileData *data) { 833 assert(data == NULL, "unexpected call with JVMTI disabled"); 834 } 835 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; } 836 837 #endif // INCLUDE_JVMTI 838 839 bool has_nonstatic_concrete_methods() const { return _misc_status.has_nonstatic_concrete_methods(); } 840 void set_has_nonstatic_concrete_methods(bool b) { _misc_status.set_has_nonstatic_concrete_methods(b); } 841 842 bool declares_nonstatic_concrete_methods() const { return _misc_status.declares_nonstatic_concrete_methods(); } 843 void set_declares_nonstatic_concrete_methods(bool b) { _misc_status.set_declares_nonstatic_concrete_methods(b); } 844 845 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 846 inline u2 next_method_idnum(); 847 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 848 849 // generics support 850 Symbol* generic_signature() const { return _constants->generic_signature(); } 851 u2 generic_signature_index() const { return _constants->generic_signature_index(); } 852 void set_generic_signature_index(u2 sig_index) { _constants->set_generic_signature_index(sig_index); } 853 854 u2 enclosing_method_data(int offset) const; 855 u2 enclosing_method_class_index() const { 856 return enclosing_method_data(enclosing_method_class_index_offset); 857 } 858 u2 enclosing_method_method_index() { 859 return enclosing_method_data(enclosing_method_method_index_offset); 860 } 861 void set_enclosing_method_indices(u2 class_index, 862 u2 method_index); 863 864 // jmethodID support 865 jmethodID get_jmethod_id(const methodHandle& method_h); 866 jmethodID get_jmethod_id_fetch_or_update(size_t idnum, 867 jmethodID new_id, jmethodID* new_jmeths, 868 jmethodID* to_dealloc_id_p, 869 jmethodID** to_dealloc_jmeths_p); 870 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 871 size_t *length_p, jmethodID* id_p); 872 void ensure_space_for_methodids(int start_offset = 0); 873 jmethodID jmethod_id_or_null(Method* method); 874 875 // annotations support 876 Annotations* annotations() const { return _annotations; } 877 void set_annotations(Annotations* anno) { _annotations = anno; } 878 879 AnnotationArray* class_annotations() const { 880 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 881 } 882 Array<AnnotationArray*>* fields_annotations() const { 883 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 884 } 885 AnnotationArray* class_type_annotations() const { 886 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 887 } 888 Array<AnnotationArray*>* fields_type_annotations() const { 889 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 890 } 891 // allocation 892 instanceOop allocate_instance(TRAPS); 893 static instanceOop allocate_instance(oop cls, TRAPS); 894 895 // additional member function to return a handle 896 instanceHandle allocate_instance_handle(TRAPS); 897 898 objArrayOop allocate_objArray(int n, int length, TRAPS); 899 // Helper function 900 static instanceOop register_finalizer(instanceOop i, TRAPS); 901 902 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 903 // if not, throw either an Error or an Exception. 904 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 905 906 // initialization 907 void call_class_initializer(TRAPS); 908 void set_initialization_state_and_notify(ClassState state, JavaThread* current); 909 910 // OopMapCache support 911 OopMapCache* oop_map_cache() { return _oop_map_cache; } 912 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 913 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 914 915 // JNI identifier support (for static fields - for jni performance) 916 JNIid* jni_ids() { return _jni_ids; } 917 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 918 JNIid* jni_id_for(int offset); 919 920 // maintenance of deoptimization dependencies 921 inline DependencyContext dependencies(); 922 int mark_dependent_nmethods(KlassDepChange& changes); 923 void add_dependent_nmethod(nmethod* nm); 924 void clean_dependency_context(); 925 926 // On-stack replacement support 927 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 928 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 929 void add_osr_nmethod(nmethod* n); 930 bool remove_osr_nmethod(nmethod* n); 931 int mark_osr_nmethods(const Method* m); 932 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 933 934 #if INCLUDE_JVMTI 935 // Breakpoint support (see methods on Method* for details) 936 BreakpointInfo* breakpoints() const { return _breakpoints; }; 937 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 938 #endif 939 940 // support for stub routines 941 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 942 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;) 943 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 944 945 static ByteSize inline_type_field_klasses_offset() { return in_ByteSize(offset_of(InstanceKlass, _inline_type_field_klasses)); } 946 static ByteSize adr_inlineklass_fixed_block_offset() { return in_ByteSize(offset_of(InstanceKlass, _adr_inlineklass_fixed_block)); } 947 948 // subclass/subinterface checks 949 bool implements_interface(Klass* k) const; 950 bool is_same_or_direct_interface(Klass* k) const; 951 952 #ifdef ASSERT 953 // check whether this class or one of its superclasses was redefined 954 bool has_redefined_this_or_super() const; 955 #endif 956 957 // Access to the implementor of an interface. 958 InstanceKlass* implementor() const; 959 void set_implementor(InstanceKlass* ik); 960 int nof_implementors() const; 961 void add_implementor(InstanceKlass* ik); // ik is a new class that implements this interface 962 void init_implementor(); // initialize 963 964 // link this class into the implementors list of every interface it implements 965 void process_interfaces(); 966 967 // virtual operations from Klass 968 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 969 Array<InstanceKlass*>* transitive_interfaces); 970 bool can_be_primary_super_slow() const; 971 size_t oop_size(oop obj) const { return size_helper(); } 972 // slow because it's a virtual call and used for verifying the layout_helper. 973 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 974 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 975 976 // Iterators 977 void do_local_static_fields(FieldClosure* cl); 978 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 979 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 980 void print_nonstatic_fields(FieldClosure* cl); // including inherited and injected fields 981 982 void methods_do(void f(Method* method)); 983 984 static InstanceKlass* cast(Klass* k) { 985 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 986 } 987 988 static const InstanceKlass* cast(const Klass* k) { 989 assert(k != NULL, "k should not be null"); 990 assert(k->is_instance_klass(), "cast to InstanceKlass"); 991 return static_cast<const InstanceKlass*>(k); 992 } 993 994 virtual InstanceKlass* java_super() const { 995 return (super() == NULL) ? NULL : cast(super()); 996 } 997 998 // Sizing (in words) 999 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 1000 1001 static int size(int vtable_length, int itable_length, 1002 int nonstatic_oop_map_size, 1003 bool is_interface, 1004 int java_fields, bool is_inline_type) { 1005 return align_metadata_size(header_size() + 1006 vtable_length + 1007 itable_length + 1008 nonstatic_oop_map_size + 1009 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 1010 (java_fields * (int)sizeof(Klass*)/wordSize) + 1011 (is_inline_type ? (int)sizeof(InlineKlassFixedBlock) : 0)); 1012 } 1013 1014 int size() const { return size(vtable_length(), 1015 itable_length(), 1016 nonstatic_oop_map_size(), 1017 is_interface(), 1018 has_inline_type_fields() ? java_fields_count() : 0, 1019 is_inline_klass()); 1020 } 1021 1022 1023 inline intptr_t* start_of_itable() const; 1024 inline intptr_t* end_of_itable() const; 1025 inline int itable_offset_in_words() const; 1026 inline oop static_field_base_raw(); 1027 bool bounds_check(address addr, bool edge_ok = false, intptr_t size_in_bytes = -1) const PRODUCT_RETURN0; 1028 1029 inline OopMapBlock* start_of_nonstatic_oop_maps() const; 1030 inline Klass** end_of_nonstatic_oop_maps() const; 1031 1032 inline InstanceKlass* volatile* adr_implementor() const; 1033 1034 inline address adr_inline_type_field_klasses() const; 1035 inline Klass* get_inline_type_field_klass(int idx) const; 1036 inline Klass* get_inline_type_field_klass_or_null(int idx) const; 1037 inline void set_inline_type_field_klass(int idx, Klass* k); 1038 inline void reset_inline_type_field_klass(int idx); 1039 1040 // Use this to return the size of an instance in heap words: 1041 virtual int size_helper() const { 1042 return layout_helper_to_size_helper(layout_helper()); 1043 } 1044 1045 // This bit is initialized in classFileParser.cpp. 1046 // It is false under any of the following conditions: 1047 // - the class is abstract (including any interface) 1048 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1049 // - the class size is larger than FastAllocateSizeLimit 1050 // - the class is java/lang/Class, which cannot be allocated directly 1051 bool can_be_fastpath_allocated() const { 1052 return !layout_helper_needs_slow_path(layout_helper()); 1053 } 1054 1055 // Java itable 1056 klassItable itable() const; // return klassItable wrapper 1057 Method* method_at_itable(InstanceKlass* holder, int index, TRAPS); 1058 Method* method_at_itable_or_null(InstanceKlass* holder, int index, bool& itable_entry_found); 1059 int vtable_index_of_interface_method(Method* method); 1060 1061 #if INCLUDE_JVMTI 1062 void adjust_default_methods(bool* trace_name_printed); 1063 #endif // INCLUDE_JVMTI 1064 1065 void clean_weak_instanceklass_links(); 1066 private: 1067 void clean_implementors_list(); 1068 void clean_method_data(); 1069 1070 public: 1071 // Explicit metaspace deallocation of fields 1072 // For RedefineClasses and class file parsing errors, we need to deallocate 1073 // instanceKlasses and the metadata they point to. 1074 void deallocate_contents(ClassLoaderData* loader_data); 1075 static void deallocate_methods(ClassLoaderData* loader_data, 1076 Array<Method*>* methods); 1077 void static deallocate_interfaces(ClassLoaderData* loader_data, 1078 const Klass* super_klass, 1079 Array<InstanceKlass*>* local_interfaces, 1080 Array<InstanceKlass*>* transitive_interfaces); 1081 void static deallocate_record_components(ClassLoaderData* loader_data, 1082 Array<RecordComponent*>* record_component); 1083 1084 // The constant pool is on stack if any of the methods are executing or 1085 // referenced by handles. 1086 bool on_stack() const { return _constants->on_stack(); } 1087 1088 // callbacks for actions during class unloading 1089 static void unload_class(InstanceKlass* ik); 1090 1091 virtual void release_C_heap_structures(bool release_constant_pool = true); 1092 1093 // Naming 1094 const char* signature_name() const; 1095 const char* signature_name_of_carrier(char c) const; 1096 1097 // Oop fields (and metadata) iterators 1098 // 1099 // The InstanceKlass iterators also visits the Object's klass. 1100 1101 // Forward iteration 1102 public: 1103 // Iterate over all oop fields in the oop maps. 1104 template <typename T, class OopClosureType> 1105 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1106 1107 // Iterate over all oop fields and metadata. 1108 template <typename T, class OopClosureType> 1109 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 1110 1111 // Iterate over all oop fields in one oop map. 1112 template <typename T, class OopClosureType> 1113 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1114 1115 1116 // Reverse iteration 1117 // Iterate over all oop fields and metadata. 1118 template <typename T, class OopClosureType> 1119 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1120 1121 private: 1122 // Iterate over all oop fields in the oop maps. 1123 template <typename T, class OopClosureType> 1124 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1125 1126 // Iterate over all oop fields in one oop map. 1127 template <typename T, class OopClosureType> 1128 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1129 1130 1131 // Bounded range iteration 1132 public: 1133 // Iterate over all oop fields in the oop maps. 1134 template <typename T, class OopClosureType> 1135 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1136 1137 // Iterate over all oop fields and metadata. 1138 template <typename T, class OopClosureType> 1139 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1140 1141 private: 1142 // Iterate over all oop fields in one oop map. 1143 template <typename T, class OopClosureType> 1144 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1145 1146 1147 public: 1148 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1149 1150 private: 1151 // initialization state 1152 void set_init_state(ClassState state); 1153 void set_rewritten() { _misc_status.set_rewritten(true); } 1154 void set_init_thread(Thread *thread) { 1155 assert(thread == nullptr || _init_thread == nullptr, "Only one thread is allowed to own initialization"); 1156 _init_thread = thread; 1157 } 1158 1159 // The RedefineClasses() API can cause new method idnums to be needed 1160 // which will cause the caches to grow. Safety requires different 1161 // cache management logic if the caches can grow instead of just 1162 // going from NULL to non-NULL. 1163 bool idnum_can_increment() const { return has_been_redefined(); } 1164 inline jmethodID* methods_jmethod_ids_acquire() const; 1165 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1166 1167 // Lock during initialization 1168 public: 1169 // Returns the array class for the n'th dimension 1170 virtual Klass* array_klass(int n, TRAPS); 1171 virtual Klass* array_klass_or_null(int n); 1172 1173 // Returns the array class with this class as element type 1174 virtual Klass* array_klass(TRAPS); 1175 virtual Klass* array_klass_or_null(); 1176 1177 static void clean_initialization_error_table(); 1178 1179 Monitor* init_monitor() const { return _init_monitor; } 1180 private: 1181 void check_link_state_and_wait(JavaThread* current); 1182 bool link_class_impl (TRAPS); 1183 bool verify_code (TRAPS); 1184 void initialize_impl (TRAPS); 1185 void initialize_super_interfaces (TRAPS); 1186 1187 void add_initialization_error(JavaThread* current, Handle exception); 1188 oop get_initialization_error(JavaThread* current); 1189 1190 // find a local method (returns NULL if not found) 1191 Method* find_method_impl(const Symbol* name, 1192 const Symbol* signature, 1193 OverpassLookupMode overpass_mode, 1194 StaticLookupMode static_mode, 1195 PrivateLookupMode private_mode) const; 1196 1197 static Method* find_method_impl(const Array<Method*>* methods, 1198 const Symbol* name, 1199 const Symbol* signature, 1200 OverpassLookupMode overpass_mode, 1201 StaticLookupMode static_mode, 1202 PrivateLookupMode private_mode); 1203 1204 #if INCLUDE_JVMTI 1205 // RedefineClasses support 1206 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1207 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1208 #endif 1209 // log class name to classlist 1210 void log_to_classlist() const; 1211 public: 1212 1213 #if INCLUDE_CDS 1214 // CDS support - remove and restore oops from metadata. Oops are not shared. 1215 virtual void remove_unshareable_info(); 1216 virtual void remove_java_mirror(); 1217 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, PackageEntry* pkg_entry, TRAPS); 1218 void init_shared_package_entry(); 1219 bool can_be_verified_at_dumptime() const; 1220 #endif 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