1 /* 2 * Copyright (c) 1997, 2020, 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 "classfile/classLoaderData.hpp" 29 #include "memory/referenceType.hpp" 30 #include "oops/annotations.hpp" 31 #include "oops/constMethod.hpp" 32 #include "oops/fieldInfo.hpp" 33 #include "oops/instanceOop.hpp" 34 #include "oops/klassVtable.hpp" 35 #include "runtime/handles.hpp" 36 #include "runtime/os.hpp" 37 #include "utilities/accessFlags.hpp" 38 #include "utilities/align.hpp" 39 #include "utilities/macros.hpp" 40 #if INCLUDE_JFR 41 #include "jfr/support/jfrKlassExtension.hpp" 42 #endif 43 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 unsafe_anonymous_host klass] only exist for an unsafe anonymous class (JSR 292 enabled) 56 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true 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 InterpreterOopMap; 74 class PackageEntry; 75 class ModuleEntry; 76 77 // This is used in iterators below. 78 class FieldClosure: public StackObj { 79 public: 80 virtual void do_field(fieldDescriptor* fd) = 0; 81 }; 82 83 #ifndef PRODUCT 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 #endif // !PRODUCT 94 95 // Describes where oops are located in instances of this klass. 96 class OopMapBlock { 97 public: 98 // Byte offset of the first oop mapped by this block. 99 int offset() const { return _offset; } 100 void set_offset(int offset) { _offset = offset; } 101 102 // Number of oops in this block. 103 uint count() const { return _count; } 104 void set_count(uint count) { _count = count; } 105 106 void increment_count(int diff) { _count += diff; } 107 108 int offset_span() const { return _count * heapOopSize; } 109 110 int end_offset() const { 111 return offset() + offset_span(); 112 } 113 114 bool is_contiguous(int another_offset) const { 115 return another_offset == end_offset(); 116 } 117 118 // sizeof(OopMapBlock) in words. 119 static const int size_in_words() { 120 return align_up((int)sizeof(OopMapBlock), wordSize) >> 121 LogBytesPerWord; 122 } 123 124 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) { 125 return a->offset() - b->offset(); 126 } 127 128 private: 129 int _offset; 130 uint _count; 131 }; 132 133 struct JvmtiCachedClassFileData; 134 135 class InstanceKlass: public Klass { 136 friend class VMStructs; 137 friend class JVMCIVMStructs; 138 friend class ClassFileParser; 139 friend class CompileReplay; 140 141 public: 142 static const KlassID ID = InstanceKlassID; 143 144 protected: 145 InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id = ID); 146 147 public: 148 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 149 150 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 151 // of the class loading & initialization procedure, and the use of the states. 152 enum ClassState { 153 allocated, // allocated (but not yet linked) 154 loaded, // loaded and inserted in class hierarchy (but not linked yet) 155 linked, // successfully linked/verified (but not initialized yet) 156 being_initialized, // currently running class initializer 157 fully_initialized, // initialized (successfull final state) 158 initialization_error // error happened during initialization 159 }; 160 161 private: 162 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS); 163 164 protected: 165 // If you add a new field that points to any metaspace object, you 166 // must add this field to InstanceKlass::metaspace_pointers_do(). 167 168 // Annotations for this class 169 Annotations* _annotations; 170 // Package this class is defined in 171 PackageEntry* _package_entry; 172 // Array classes holding elements of this class. 173 Klass* volatile _array_klasses; 174 // Constant pool for this class. 175 ConstantPool* _constants; 176 // The InnerClasses attribute and EnclosingMethod attribute. The 177 // _inner_classes is an array of shorts. If the class has InnerClasses 178 // attribute, then the _inner_classes array begins with 4-tuples of shorts 179 // [inner_class_info_index, outer_class_info_index, 180 // inner_name_index, inner_class_access_flags] for the InnerClasses 181 // attribute. If the EnclosingMethod attribute exists, it occupies the 182 // last two shorts [class_index, method_index] of the array. If only 183 // the InnerClasses attribute exists, the _inner_classes array length is 184 // number_of_inner_classes * 4. If the class has both InnerClasses 185 // and EnclosingMethod attributes the _inner_classes array length is 186 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 187 Array<jushort>* _inner_classes; 188 189 // The NestMembers attribute. An array of shorts, where each is a 190 // class info index for the class that is a nest member. This data 191 // has not been validated. 192 Array<jushort>* _nest_members; 193 194 // The NestHost attribute. The class info index for the class 195 // that is the nest-host of this class. This data has not been validated. 196 jushort _nest_host_index; 197 198 // Resolved nest-host klass: either true nest-host or self if we are not 199 // nested, or an error occurred resolving or validating the nominated 200 // nest-host. Can also be set directly by JDK API's that establish nest 201 // relationships. 202 // By always being set it makes nest-member access checks simpler. 203 InstanceKlass* _nest_host; 204 205 // The contents of the Record attribute. 206 Array<RecordComponent*>* _record_components; 207 208 // the source debug extension for this klass, NULL if not specified. 209 // Specified as UTF-8 string without terminating zero byte in the classfile, 210 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 211 const char* _source_debug_extension; 212 // Array name derived from this class which needs unreferencing 213 // if this class is unloaded. 214 Symbol* _array_name; 215 216 // Number of heapOopSize words used by non-static fields in this klass 217 // (including inherited fields but after header_size()). 218 int _nonstatic_field_size; 219 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 220 // Constant pool index to the utf8 entry of the Generic signature, 221 // or 0 if none. 222 u2 _generic_signature_index; 223 // Constant pool index to the utf8 entry for the name of source file 224 // containing this klass, 0 if not specified. 225 u2 _source_file_name_index; 226 u2 _static_oop_field_count;// number of static oop fields in this klass 227 u2 _java_fields_count; // The number of declared Java fields 228 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 229 230 int _itable_len; // length of Java itable (in words) 231 // _is_marked_dependent can be set concurrently, thus cannot be part of the 232 // _misc_flags. 233 bool _is_marked_dependent; // used for marking during flushing and deoptimization 234 235 // The low two bits of _misc_flags contains the kind field. 236 // This can be used to quickly discriminate among the four kinds of 237 // InstanceKlass. 238 239 static const unsigned _misc_kind_field_size = 2; 240 static const unsigned _misc_kind_field_pos = 0; 241 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u; 242 243 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass 244 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass 245 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass 246 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass 247 248 // Start after _misc_kind field. 249 enum { 250 _misc_rewritten = 1 << 2, // methods rewritten. 251 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops 252 _misc_should_verify_class = 1 << 4, // allow caching of preverification 253 _misc_is_unsafe_anonymous = 1 << 5, // has embedded _unsafe_anonymous_host field 254 _misc_is_contended = 1 << 6, // marked with contended annotation 255 _misc_has_nonstatic_concrete_methods = 1 << 7, // class/superclass/implemented interfaces has non-static, concrete methods 256 _misc_declares_nonstatic_concrete_methods = 1 << 8, // directly declares non-static, concrete methods 257 _misc_has_been_redefined = 1 << 9, // class has been redefined 258 _misc_has_passed_fingerprint_check = 1 << 10, // when this class was loaded, the fingerprint computed from its 259 // code source was found to be matching the value recorded by AOT. 260 _misc_is_scratch_class = 1 << 11, // class is the redefined scratch class 261 _misc_is_shared_boot_class = 1 << 12, // defining class loader is boot class loader 262 _misc_is_shared_platform_class = 1 << 13, // defining class loader is platform class loader 263 _misc_is_shared_app_class = 1 << 14, // defining class loader is app class loader 264 _misc_has_resolved_methods = 1 << 15, // resolved methods table entries added for this class 265 _misc_is_being_redefined = 1 << 16, // used for locking redefinition 266 _misc_has_contended_annotations = 1 << 17 // has @Contended annotation 267 }; 268 u2 shared_loader_type_bits() const { 269 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class; 270 } 271 u4 _misc_flags; 272 u2 _minor_version; // minor version number of class file 273 u2 _major_version; // major version number of class file 274 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization) 275 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 276 JNIid* _jni_ids; // First JNI identifier for static fields in this class 277 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 278 nmethodBucket* volatile _dep_context; // packed DependencyContext structure 279 uint64_t volatile _dep_context_last_cleaned; 280 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 281 #if INCLUDE_JVMTI 282 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 283 // Linked instanceKlasses of previous versions 284 InstanceKlass* _previous_versions; 285 // JVMTI fields can be moved to their own structure - see 6315920 286 // JVMTI: cached class file, before retransformable agent modified it in CFLH 287 JvmtiCachedClassFileData* _cached_class_file; 288 #endif 289 290 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 291 292 // Class states are defined as ClassState (see above). 293 // Place the _init_state here to utilize the unused 2-byte after 294 // _idnum_allocated_count. 295 u1 _init_state; // state of class 296 u1 _reference_type; // reference type 297 298 u2 _this_class_index; // constant pool entry 299 #if INCLUDE_JVMTI 300 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 301 #endif 302 303 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 304 305 // Method array. 306 Array<Method*>* _methods; 307 // Default Method Array, concrete methods inherited from interfaces 308 Array<Method*>* _default_methods; 309 // Interfaces (InstanceKlass*s) this class declares locally to implement. 310 Array<InstanceKlass*>* _local_interfaces; 311 // Interfaces (InstanceKlass*s) this class implements transitively. 312 Array<InstanceKlass*>* _transitive_interfaces; 313 // Int array containing the original order of method in the class file (for JVMTI). 314 Array<int>* _method_ordering; 315 // Int array containing the vtable_indices for default_methods 316 // offset matches _default_methods offset 317 Array<int>* _default_vtable_indices; 318 319 // Instance and static variable information, starts with 6-tuples of shorts 320 // [access, name index, sig index, initval index, low_offset, high_offset] 321 // for all fields, followed by the generic signature data at the end of 322 // the array. Only fields with generic signature attributes have the generic 323 // signature data set in the array. The fields array looks like following: 324 // 325 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 326 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 327 // ... 328 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 329 // [generic signature index] 330 // [generic signature index] 331 // ... 332 Array<u2>* _fields; 333 334 // embedded Java vtable follows here 335 // embedded Java itables follows here 336 // embedded static fields follows here 337 // embedded nonstatic oop-map blocks follows here 338 // embedded implementor of this interface follows here 339 // The embedded implementor only exists if the current klass is an 340 // iterface. The possible values of the implementor fall into following 341 // three cases: 342 // NULL: no implementor. 343 // A Klass* that's not itself: one implementor. 344 // Itself: more than one implementors. 345 // embedded unsafe_anonymous_host klass follows here 346 // The embedded host klass only exists in an unsafe anonymous class for 347 // dynamic language support (JSR 292 enabled). The host class grants 348 // its access privileges to this class also. The host class is either 349 // named, or a previously loaded unsafe anonymous class. A non-anonymous class 350 // or an anonymous class loaded through normal classloading does not 351 // have this embedded field. 352 // 353 354 friend class SystemDictionary; 355 356 static bool _disable_method_binary_search; 357 358 public: 359 // The three BUILTIN class loader types 360 bool is_shared_boot_class() const { 361 return (_misc_flags & _misc_is_shared_boot_class) != 0; 362 } 363 bool is_shared_platform_class() const { 364 return (_misc_flags & _misc_is_shared_platform_class) != 0; 365 } 366 bool is_shared_app_class() const { 367 return (_misc_flags & _misc_is_shared_app_class) != 0; 368 } 369 // The UNREGISTERED class loader type 370 bool is_shared_unregistered_class() const { 371 return (_misc_flags & shared_loader_type_bits()) == 0; 372 } 373 374 void clear_shared_class_loader_type() { 375 _misc_flags &= ~shared_loader_type_bits(); 376 } 377 378 void set_shared_class_loader_type(s2 loader_type); 379 380 bool has_nonstatic_fields() const { 381 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 382 } 383 void set_has_nonstatic_fields(bool b) { 384 if (b) { 385 _misc_flags |= _misc_has_nonstatic_fields; 386 } else { 387 _misc_flags &= ~_misc_has_nonstatic_fields; 388 } 389 } 390 391 // field sizes 392 int nonstatic_field_size() const { return _nonstatic_field_size; } 393 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 394 395 int static_field_size() const { return _static_field_size; } 396 void set_static_field_size(int size) { _static_field_size = size; } 397 398 int static_oop_field_count() const { return (int)_static_oop_field_count; } 399 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 400 401 // Java itable 402 int itable_length() const { return _itable_len; } 403 void set_itable_length(int len) { _itable_len = len; } 404 405 // array klasses 406 Klass* array_klasses() const { return _array_klasses; } 407 inline Klass* array_klasses_acquire() const; // load with acquire semantics 408 void set_array_klasses(Klass* k) { _array_klasses = k; } 409 inline void release_set_array_klasses(Klass* 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()); } 453 454 // Number of Java declared fields 455 int java_fields_count() const { return (int)_java_fields_count; } 456 457 Array<u2>* fields() const { return _fields; } 458 void set_fields(Array<u2>* f, u2 java_fields_count) { 459 guarantee(_fields == NULL || f == NULL, "Just checking"); 460 _fields = f; 461 _java_fields_count = java_fields_count; 462 } 463 464 // inner classes 465 Array<u2>* inner_classes() const { return _inner_classes; } 466 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 467 468 // nest members 469 Array<u2>* nest_members() const { return _nest_members; } 470 void set_nest_members(Array<u2>* m) { _nest_members = m; } 471 472 // nest-host index 473 jushort nest_host_index() const { return _nest_host_index; } 474 void set_nest_host_index(u2 i) { _nest_host_index = i; } 475 // dynamic nest member support 476 void set_nest_host(InstanceKlass* host, TRAPS); 477 478 // record components 479 Array<RecordComponent*>* record_components() const { return _record_components; } 480 void set_record_components(Array<RecordComponent*>* record_components) { 481 _record_components = record_components; 482 } 483 bool is_record() const { return _record_components != NULL; } 484 485 private: 486 // Called to verify that k is a member of this nest - does not look at k's nest-host 487 bool has_nest_member(InstanceKlass* k, TRAPS) const; 488 489 public: 490 // Used to construct informative IllegalAccessError messages at a higher level, 491 // if there was an issue resolving or validating the nest host. 492 // Returns NULL if there was no error. 493 const char* nest_host_error(TRAPS); 494 // Returns nest-host class, resolving and validating it if needed. 495 // Returns NULL if resolution is not possible from the calling context. 496 InstanceKlass* nest_host(TRAPS); 497 // Check if this klass is a nestmate of k - resolves this nest-host and k's 498 bool has_nestmate_access_to(InstanceKlass* k, TRAPS); 499 500 enum InnerClassAttributeOffset { 501 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 502 inner_class_inner_class_info_offset = 0, 503 inner_class_outer_class_info_offset = 1, 504 inner_class_inner_name_offset = 2, 505 inner_class_access_flags_offset = 3, 506 inner_class_next_offset = 4 507 }; 508 509 enum EnclosingMethodAttributeOffset { 510 enclosing_method_class_index_offset = 0, 511 enclosing_method_method_index_offset = 1, 512 enclosing_method_attribute_size = 2 513 }; 514 515 // method override check 516 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 517 518 // package 519 PackageEntry* package() const { return _package_entry; } 520 ModuleEntry* module() const; 521 bool in_unnamed_package() const { return (_package_entry == NULL); } 522 void set_package(PackageEntry* p) { _package_entry = p; } 523 void set_package(ClassLoaderData* loader_data, TRAPS); 524 bool is_same_class_package(const Klass* class2) const; 525 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const; 526 527 // find an enclosing class 528 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 529 530 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 531 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 532 533 private: 534 // Check prohibited package ("java/" only loadable by boot or platform loaders) 535 static void check_prohibited_package(Symbol* class_name, 536 ClassLoaderData* loader_data, 537 TRAPS); 538 public: 539 // initialization state 540 bool is_loaded() const { return _init_state >= loaded; } 541 bool is_linked() const { return _init_state >= linked; } 542 bool is_initialized() const { return _init_state == fully_initialized; } 543 bool is_not_initialized() const { return _init_state < being_initialized; } 544 bool is_being_initialized() const { return _init_state == being_initialized; } 545 bool is_in_error_state() const { return _init_state == initialization_error; } 546 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 547 ClassState init_state() { return (ClassState)_init_state; } 548 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 549 550 // defineClass specified verification 551 bool should_verify_class() const { 552 return (_misc_flags & _misc_should_verify_class) != 0; 553 } 554 void set_should_verify_class(bool value) { 555 if (value) { 556 _misc_flags |= _misc_should_verify_class; 557 } else { 558 _misc_flags &= ~_misc_should_verify_class; 559 } 560 } 561 562 // marking 563 bool is_marked_dependent() const { return _is_marked_dependent; } 564 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 565 566 // initialization (virtuals from Klass) 567 bool should_be_initialized() const; // means that initialize should be called 568 void initialize(TRAPS); 569 void link_class(TRAPS); 570 bool link_class_or_fail(TRAPS); // returns false on failure 571 void rewrite_class(TRAPS); 572 void link_methods(TRAPS); 573 Method* class_initializer() const; 574 575 // set the class to initialized if no static initializer is present 576 void eager_initialize(Thread *thread); 577 578 // reference type 579 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 580 void set_reference_type(ReferenceType t) { 581 assert(t == (u1)t, "overflow"); 582 _reference_type = (u1)t; 583 } 584 585 // this class cp index 586 u2 this_class_index() const { return _this_class_index; } 587 void set_this_class_index(u2 index) { _this_class_index = index; } 588 589 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 590 591 // find local field, returns true if found 592 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 593 // find field in direct superinterfaces, returns the interface in which the field is defined 594 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 595 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 596 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 597 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 598 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 599 600 // find a non-static or static field given its offset within the class. 601 bool contains_field_offset(int offset); 602 603 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 604 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 605 606 private: 607 inline static int quick_search(const Array<Method*>* methods, const Symbol* name); 608 609 public: 610 static void disable_method_binary_search() { 611 _disable_method_binary_search = true; 612 } 613 614 // find a local method (returns NULL if not found) 615 Method* find_method(const Symbol* name, const Symbol* signature) const; 616 static Method* find_method(const Array<Method*>* methods, 617 const Symbol* name, 618 const Symbol* signature); 619 620 // find a local method, but skip static methods 621 Method* find_instance_method(const Symbol* name, const Symbol* signature, 622 PrivateLookupMode private_mode = find_private) const; 623 static Method* find_instance_method(const Array<Method*>* methods, 624 const Symbol* name, 625 const Symbol* signature, 626 PrivateLookupMode private_mode = find_private); 627 628 // find a local method (returns NULL if not found) 629 Method* find_local_method(const Symbol* name, 630 const Symbol* signature, 631 OverpassLookupMode overpass_mode, 632 StaticLookupMode static_mode, 633 PrivateLookupMode private_mode) const; 634 635 // find a local method from given methods array (returns NULL if not found) 636 static Method* find_local_method(const Array<Method*>* methods, 637 const Symbol* name, 638 const Symbol* signature, 639 OverpassLookupMode overpass_mode, 640 StaticLookupMode static_mode, 641 PrivateLookupMode private_mode); 642 643 // find a local method index in methods or default_methods (returns -1 if not found) 644 static int find_method_index(const Array<Method*>* methods, 645 const Symbol* name, 646 const Symbol* signature, 647 OverpassLookupMode overpass_mode, 648 StaticLookupMode static_mode, 649 PrivateLookupMode private_mode); 650 651 // lookup operation (returns NULL if not found) 652 Method* uncached_lookup_method(const Symbol* name, 653 const Symbol* signature, 654 OverpassLookupMode overpass_mode, 655 PrivateLookupMode private_mode = find_private) const; 656 657 // lookup a method in all the interfaces that this class implements 658 // (returns NULL if not found) 659 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 660 661 // lookup a method in local defaults then in all interfaces 662 // (returns NULL if not found) 663 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 664 665 // Find method indices by name. If a method with the specified name is 666 // found the index to the first method is returned, and 'end' is filled in 667 // with the index of first non-name-matching method. If no method is found 668 // -1 is returned. 669 int find_method_by_name(const Symbol* name, int* end) const; 670 static int find_method_by_name(const Array<Method*>* methods, 671 const Symbol* name, int* end); 672 673 // constant pool 674 ConstantPool* constants() const { return _constants; } 675 void set_constants(ConstantPool* c) { _constants = c; } 676 677 // protection domain 678 oop protection_domain() const; 679 680 // signers 681 objArrayOop signers() const; 682 683 // host class 684 InstanceKlass* unsafe_anonymous_host() const { 685 InstanceKlass** hk = adr_unsafe_anonymous_host(); 686 if (hk == NULL) { 687 assert(!is_unsafe_anonymous(), "Unsafe anonymous classes have host klasses"); 688 return NULL; 689 } else { 690 assert(*hk != NULL, "host klass should always be set if the address is not null"); 691 assert(is_unsafe_anonymous(), "Only unsafe anonymous classes have host klasses"); 692 return *hk; 693 } 694 } 695 void set_unsafe_anonymous_host(const InstanceKlass* host) { 696 assert(is_unsafe_anonymous(), "not unsafe anonymous"); 697 const InstanceKlass** addr = (const InstanceKlass **)adr_unsafe_anonymous_host(); 698 assert(addr != NULL, "no reversed space"); 699 if (addr != NULL) { 700 *addr = host; 701 } 702 } 703 bool is_unsafe_anonymous() const { 704 return (_misc_flags & _misc_is_unsafe_anonymous) != 0; 705 } 706 void set_is_unsafe_anonymous(bool value) { 707 if (value) { 708 _misc_flags |= _misc_is_unsafe_anonymous; 709 } else { 710 _misc_flags &= ~_misc_is_unsafe_anonymous; 711 } 712 } 713 714 bool is_contended() const { 715 return (_misc_flags & _misc_is_contended) != 0; 716 } 717 void set_is_contended(bool value) { 718 if (value) { 719 _misc_flags |= _misc_is_contended; 720 } else { 721 _misc_flags &= ~_misc_is_contended; 722 } 723 } 724 725 // source file name 726 Symbol* source_file_name() const { 727 return (_source_file_name_index == 0) ? 728 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index); 729 } 730 u2 source_file_name_index() const { 731 return _source_file_name_index; 732 } 733 void set_source_file_name_index(u2 sourcefile_index) { 734 _source_file_name_index = sourcefile_index; 735 } 736 737 // minor and major version numbers of class file 738 u2 minor_version() const { return _minor_version; } 739 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 740 u2 major_version() const { return _major_version; } 741 void set_major_version(u2 major_version) { _major_version = major_version; } 742 743 // source debug extension 744 const char* source_debug_extension() const { return _source_debug_extension; } 745 void set_source_debug_extension(const char* array, int length); 746 747 // symbol unloading support (refcount already added) 748 Symbol* array_name() { return _array_name; } 749 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 750 751 // nonstatic oop-map blocks 752 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 753 return oop_map_count * OopMapBlock::size_in_words(); 754 } 755 unsigned int nonstatic_oop_map_count() const { 756 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 757 } 758 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 759 void set_nonstatic_oop_map_size(int words) { 760 _nonstatic_oop_map_size = words; 761 } 762 763 bool has_contended_annotations() const { 764 return ((_misc_flags & _misc_has_contended_annotations) != 0); 765 } 766 void set_has_contended_annotations(bool value) { 767 if (value) { 768 _misc_flags |= _misc_has_contended_annotations; 769 } else { 770 _misc_flags &= ~_misc_has_contended_annotations; 771 } 772 } 773 774 #if INCLUDE_JVMTI 775 // Redefinition locking. Class can only be redefined by one thread at a time. 776 bool is_being_redefined() const { 777 return ((_misc_flags & _misc_is_being_redefined) != 0); 778 } 779 void set_is_being_redefined(bool value) { 780 if (value) { 781 _misc_flags |= _misc_is_being_redefined; 782 } else { 783 _misc_flags &= ~_misc_is_being_redefined; 784 } 785 } 786 787 // RedefineClasses() support for previous versions: 788 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 789 void purge_previous_version_list(); 790 791 InstanceKlass* previous_versions() const { return _previous_versions; } 792 #else 793 InstanceKlass* previous_versions() const { return NULL; } 794 #endif 795 796 InstanceKlass* get_klass_version(int version) { 797 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 798 if (ik->constants()->version() == version) { 799 return ik; 800 } 801 } 802 return NULL; 803 } 804 805 bool has_been_redefined() const { 806 return (_misc_flags & _misc_has_been_redefined) != 0; 807 } 808 void set_has_been_redefined() { 809 _misc_flags |= _misc_has_been_redefined; 810 } 811 812 bool has_passed_fingerprint_check() const { 813 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0; 814 } 815 void set_has_passed_fingerprint_check(bool b) { 816 if (b) { 817 _misc_flags |= _misc_has_passed_fingerprint_check; 818 } else { 819 _misc_flags &= ~_misc_has_passed_fingerprint_check; 820 } 821 } 822 bool supers_have_passed_fingerprint_checks(); 823 824 static bool should_store_fingerprint(bool is_hidden_or_anonymous); 825 bool should_store_fingerprint() const { return should_store_fingerprint(is_hidden() || is_unsafe_anonymous()); } 826 bool has_stored_fingerprint() const; 827 uint64_t get_stored_fingerprint() const; 828 void store_fingerprint(uint64_t fingerprint); 829 830 bool is_scratch_class() const { 831 return (_misc_flags & _misc_is_scratch_class) != 0; 832 } 833 834 void set_is_scratch_class() { 835 _misc_flags |= _misc_is_scratch_class; 836 } 837 838 bool has_resolved_methods() const { 839 return (_misc_flags & _misc_has_resolved_methods) != 0; 840 } 841 842 void set_has_resolved_methods() { 843 _misc_flags |= _misc_has_resolved_methods; 844 } 845 private: 846 847 void set_kind(unsigned kind) { 848 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind"); 849 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos; 850 unsigned flags = _misc_flags & ~fmask; 851 _misc_flags = (flags | (kind << _misc_kind_field_pos)); 852 } 853 854 bool is_kind(unsigned desired) const { 855 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask; 856 return kind == desired; 857 } 858 859 public: 860 861 // Other is anything that is not one of the more specialized kinds of InstanceKlass. 862 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); } 863 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); } 864 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); } 865 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); } 866 867 #if INCLUDE_JVMTI 868 869 void init_previous_versions() { 870 _previous_versions = NULL; 871 } 872 873 private: 874 static bool _has_previous_versions; 875 public: 876 static void purge_previous_versions(InstanceKlass* ik) { 877 if (ik->has_been_redefined()) { 878 ik->purge_previous_version_list(); 879 } 880 } 881 882 static bool has_previous_versions_and_reset(); 883 static bool has_previous_versions() { return _has_previous_versions; } 884 885 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 886 void set_cached_class_file(JvmtiCachedClassFileData *data) { 887 _cached_class_file = data; 888 } 889 JvmtiCachedClassFileData * get_cached_class_file(); 890 jint get_cached_class_file_len(); 891 unsigned char * get_cached_class_file_bytes(); 892 893 // JVMTI: Support for caching of field indices, types, and offsets 894 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 895 _jvmti_cached_class_field_map = descriptor; 896 } 897 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 898 return _jvmti_cached_class_field_map; 899 } 900 #else // INCLUDE_JVMTI 901 902 static void purge_previous_versions(InstanceKlass* ik) { return; }; 903 static bool has_previous_versions_and_reset() { return false; } 904 905 void set_cached_class_file(JvmtiCachedClassFileData *data) { 906 assert(data == NULL, "unexpected call with JVMTI disabled"); 907 } 908 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; } 909 910 #endif // INCLUDE_JVMTI 911 912 bool has_nonstatic_concrete_methods() const { 913 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0; 914 } 915 void set_has_nonstatic_concrete_methods(bool b) { 916 if (b) { 917 _misc_flags |= _misc_has_nonstatic_concrete_methods; 918 } else { 919 _misc_flags &= ~_misc_has_nonstatic_concrete_methods; 920 } 921 } 922 923 bool declares_nonstatic_concrete_methods() const { 924 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0; 925 } 926 void set_declares_nonstatic_concrete_methods(bool b) { 927 if (b) { 928 _misc_flags |= _misc_declares_nonstatic_concrete_methods; 929 } else { 930 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods; 931 } 932 } 933 934 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 935 inline u2 next_method_idnum(); 936 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 937 938 // generics support 939 Symbol* generic_signature() const { 940 return (_generic_signature_index == 0) ? 941 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 942 } 943 u2 generic_signature_index() const { 944 return _generic_signature_index; 945 } 946 void set_generic_signature_index(u2 sig_index) { 947 _generic_signature_index = sig_index; 948 } 949 950 u2 enclosing_method_data(int offset) const; 951 u2 enclosing_method_class_index() const { 952 return enclosing_method_data(enclosing_method_class_index_offset); 953 } 954 u2 enclosing_method_method_index() { 955 return enclosing_method_data(enclosing_method_method_index_offset); 956 } 957 void set_enclosing_method_indices(u2 class_index, 958 u2 method_index); 959 960 // jmethodID support 961 jmethodID get_jmethod_id(const methodHandle& method_h); 962 jmethodID get_jmethod_id_fetch_or_update(size_t idnum, 963 jmethodID new_id, jmethodID* new_jmeths, 964 jmethodID* to_dealloc_id_p, 965 jmethodID** to_dealloc_jmeths_p); 966 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 967 size_t *length_p, jmethodID* id_p); 968 void ensure_space_for_methodids(int start_offset = 0); 969 jmethodID jmethod_id_or_null(Method* method); 970 971 // annotations support 972 Annotations* annotations() const { return _annotations; } 973 void set_annotations(Annotations* anno) { _annotations = anno; } 974 975 AnnotationArray* class_annotations() const { 976 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 977 } 978 Array<AnnotationArray*>* fields_annotations() const { 979 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 980 } 981 AnnotationArray* class_type_annotations() const { 982 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 983 } 984 Array<AnnotationArray*>* fields_type_annotations() const { 985 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 986 } 987 // allocation 988 instanceOop allocate_instance(TRAPS); 989 990 // additional member function to return a handle 991 instanceHandle allocate_instance_handle(TRAPS); 992 993 objArrayOop allocate_objArray(int n, int length, TRAPS); 994 // Helper function 995 static instanceOop register_finalizer(instanceOop i, TRAPS); 996 997 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 998 // if not, throw either an Error or an Exception. 999 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 1000 1001 // initialization 1002 void call_class_initializer(TRAPS); 1003 void set_initialization_state_and_notify(ClassState state, TRAPS); 1004 1005 // OopMapCache support 1006 OopMapCache* oop_map_cache() { return _oop_map_cache; } 1007 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 1008 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 1009 1010 // JNI identifier support (for static fields - for jni performance) 1011 JNIid* jni_ids() { return _jni_ids; } 1012 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 1013 JNIid* jni_id_for(int offset); 1014 1015 // maintenance of deoptimization dependencies 1016 inline DependencyContext dependencies(); 1017 int mark_dependent_nmethods(KlassDepChange& changes); 1018 void add_dependent_nmethod(nmethod* nm); 1019 void remove_dependent_nmethod(nmethod* nm); 1020 void clean_dependency_context(); 1021 1022 // On-stack replacement support 1023 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 1024 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 1025 void add_osr_nmethod(nmethod* n); 1026 bool remove_osr_nmethod(nmethod* n); 1027 int mark_osr_nmethods(const Method* m); 1028 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 1029 1030 #if INCLUDE_JVMTI 1031 // Breakpoint support (see methods on Method* for details) 1032 BreakpointInfo* breakpoints() const { return _breakpoints; }; 1033 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 1034 #endif 1035 1036 // support for stub routines 1037 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 1038 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;) 1039 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 1040 1041 // subclass/subinterface checks 1042 bool implements_interface(Klass* k) const; 1043 bool is_same_or_direct_interface(Klass* k) const; 1044 1045 #ifdef ASSERT 1046 // check whether this class or one of its superclasses was redefined 1047 bool has_redefined_this_or_super() const; 1048 #endif 1049 1050 // Access to the implementor of an interface. 1051 Klass* implementor() const; 1052 void set_implementor(Klass* k); 1053 int nof_implementors() const; 1054 void add_implementor(Klass* k); // k is a new class that implements this interface 1055 void init_implementor(); // initialize 1056 1057 // link this class into the implementors list of every interface it implements 1058 void process_interfaces(Thread *thread); 1059 1060 // virtual operations from Klass 1061 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 1062 Array<InstanceKlass*>* transitive_interfaces); 1063 bool can_be_primary_super_slow() const; 1064 int oop_size(oop obj) const { return size_helper(); } 1065 // slow because it's a virtual call and used for verifying the layout_helper. 1066 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 1067 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 1068 1069 // Iterators 1070 void do_local_static_fields(FieldClosure* cl); 1071 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 1072 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 1073 1074 void methods_do(void f(Method* method)); 1075 void array_klasses_do(void f(Klass* k)); 1076 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 1077 1078 static InstanceKlass* cast(Klass* k) { 1079 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 1080 } 1081 1082 static const InstanceKlass* cast(const Klass* k) { 1083 assert(k != NULL, "k should not be null"); 1084 assert(k->is_instance_klass(), "cast to InstanceKlass"); 1085 return static_cast<const InstanceKlass*>(k); 1086 } 1087 1088 virtual InstanceKlass* java_super() const { 1089 return (super() == NULL) ? NULL : cast(super()); 1090 } 1091 1092 // Sizing (in words) 1093 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 1094 1095 static int size(int vtable_length, int itable_length, 1096 int nonstatic_oop_map_size, 1097 bool is_interface, bool is_unsafe_anonymous, bool has_stored_fingerprint) { 1098 return align_metadata_size(header_size() + 1099 vtable_length + 1100 itable_length + 1101 nonstatic_oop_map_size + 1102 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 1103 (is_unsafe_anonymous ? (int)sizeof(Klass*)/wordSize : 0) + 1104 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0)); 1105 } 1106 int size() const { return size(vtable_length(), 1107 itable_length(), 1108 nonstatic_oop_map_size(), 1109 is_interface(), 1110 is_unsafe_anonymous(), 1111 has_stored_fingerprint()); 1112 } 1113 1114 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); } 1115 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 1116 1117 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 1118 1119 oop static_field_base_raw() { return java_mirror(); } 1120 1121 OopMapBlock* start_of_nonstatic_oop_maps() const { 1122 return (OopMapBlock*)(start_of_itable() + itable_length()); 1123 } 1124 1125 Klass** end_of_nonstatic_oop_maps() const { 1126 return (Klass**)(start_of_nonstatic_oop_maps() + 1127 nonstatic_oop_map_count()); 1128 } 1129 1130 Klass* volatile* adr_implementor() const { 1131 if (is_interface()) { 1132 return (Klass* volatile*)end_of_nonstatic_oop_maps(); 1133 } else { 1134 return NULL; 1135 } 1136 }; 1137 1138 InstanceKlass** adr_unsafe_anonymous_host() const { 1139 if (is_unsafe_anonymous()) { 1140 InstanceKlass** adr_impl = (InstanceKlass**)adr_implementor(); 1141 if (adr_impl != NULL) { 1142 return adr_impl + 1; 1143 } else { 1144 return (InstanceKlass **)end_of_nonstatic_oop_maps(); 1145 } 1146 } else { 1147 return NULL; 1148 } 1149 } 1150 1151 address adr_fingerprint() const { 1152 if (has_stored_fingerprint()) { 1153 InstanceKlass** adr_host = adr_unsafe_anonymous_host(); 1154 if (adr_host != NULL) { 1155 return (address)(adr_host + 1); 1156 } 1157 1158 Klass* volatile* adr_impl = adr_implementor(); 1159 if (adr_impl != NULL) { 1160 return (address)(adr_impl + 1); 1161 } 1162 1163 return (address)end_of_nonstatic_oop_maps(); 1164 } else { 1165 return NULL; 1166 } 1167 } 1168 1169 // Use this to return the size of an instance in heap words: 1170 int size_helper() const { 1171 return layout_helper_to_size_helper(layout_helper()); 1172 } 1173 1174 // This bit is initialized in classFileParser.cpp. 1175 // It is false under any of the following conditions: 1176 // - the class is abstract (including any interface) 1177 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1178 // - the class size is larger than FastAllocateSizeLimit 1179 // - the class is java/lang/Class, which cannot be allocated directly 1180 bool can_be_fastpath_allocated() const { 1181 return !layout_helper_needs_slow_path(layout_helper()); 1182 } 1183 1184 // Java itable 1185 klassItable itable() const; // return klassItable wrapper 1186 Method* method_at_itable(Klass* holder, int index, TRAPS); 1187 1188 #if INCLUDE_JVMTI 1189 void adjust_default_methods(bool* trace_name_printed); 1190 #endif // INCLUDE_JVMTI 1191 1192 void clean_weak_instanceklass_links(); 1193 private: 1194 void clean_implementors_list(); 1195 void clean_method_data(); 1196 1197 public: 1198 // Explicit metaspace deallocation of fields 1199 // For RedefineClasses and class file parsing errors, we need to deallocate 1200 // instanceKlasses and the metadata they point to. 1201 void deallocate_contents(ClassLoaderData* loader_data); 1202 static void deallocate_methods(ClassLoaderData* loader_data, 1203 Array<Method*>* methods); 1204 void static deallocate_interfaces(ClassLoaderData* loader_data, 1205 const Klass* super_klass, 1206 Array<InstanceKlass*>* local_interfaces, 1207 Array<InstanceKlass*>* transitive_interfaces); 1208 void static deallocate_record_components(ClassLoaderData* loader_data, 1209 Array<RecordComponent*>* record_component); 1210 1211 // The constant pool is on stack if any of the methods are executing or 1212 // referenced by handles. 1213 bool on_stack() const { return _constants->on_stack(); } 1214 1215 // callbacks for actions during class unloading 1216 static void unload_class(InstanceKlass* ik); 1217 static void release_C_heap_structures(InstanceKlass* ik); 1218 1219 // Naming 1220 const char* signature_name() const; 1221 1222 // Oop fields (and metadata) iterators 1223 // 1224 // The InstanceKlass iterators also visits the Object's klass. 1225 1226 // Forward iteration 1227 public: 1228 // Iterate over all oop fields in the oop maps. 1229 template <typename T, class OopClosureType> 1230 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1231 1232 // Iterate over all oop fields and metadata. 1233 template <typename T, class OopClosureType> 1234 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 1235 1236 // Iterate over all oop fields in one oop map. 1237 template <typename T, class OopClosureType> 1238 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1239 1240 1241 // Reverse iteration 1242 // Iterate over all oop fields and metadata. 1243 template <typename T, class OopClosureType> 1244 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1245 1246 private: 1247 // Iterate over all oop fields in the oop maps. 1248 template <typename T, class OopClosureType> 1249 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1250 1251 // Iterate over all oop fields in one oop map. 1252 template <typename T, class OopClosureType> 1253 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1254 1255 1256 // Bounded range iteration 1257 public: 1258 // Iterate over all oop fields in the oop maps. 1259 template <typename T, class OopClosureType> 1260 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1261 1262 // Iterate over all oop fields and metadata. 1263 template <typename T, class OopClosureType> 1264 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1265 1266 private: 1267 // Iterate over all oop fields in one oop map. 1268 template <typename T, class OopClosureType> 1269 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1270 1271 1272 public: 1273 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1274 1275 private: 1276 // initialization state 1277 void set_init_state(ClassState state); 1278 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1279 void set_init_thread(Thread *thread) { _init_thread = thread; } 1280 1281 // The RedefineClasses() API can cause new method idnums to be needed 1282 // which will cause the caches to grow. Safety requires different 1283 // cache management logic if the caches can grow instead of just 1284 // going from NULL to non-NULL. 1285 bool idnum_can_increment() const { return has_been_redefined(); } 1286 inline jmethodID* methods_jmethod_ids_acquire() const; 1287 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1288 1289 // Lock during initialization 1290 public: 1291 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1292 // Must be one per class and it has to be a VM internal object so java code 1293 // cannot lock it (like the mirror). 1294 // It has to be an object not a Mutex because it's held through java calls. 1295 oop init_lock() const; 1296 private: 1297 void fence_and_clear_init_lock(); 1298 1299 bool link_class_impl (TRAPS); 1300 bool verify_code (TRAPS); 1301 void initialize_impl (TRAPS); 1302 void initialize_super_interfaces (TRAPS); 1303 void eager_initialize_impl (); 1304 /* jni_id_for_impl for jfieldID only */ 1305 JNIid* jni_id_for_impl (int offset); 1306 1307 // Returns the array class for the n'th dimension 1308 Klass* array_klass_impl(bool or_null, int n, TRAPS); 1309 1310 // Returns the array class with this class as element type 1311 Klass* array_klass_impl(bool or_null, TRAPS); 1312 1313 // find a local method (returns NULL if not found) 1314 Method* find_method_impl(const Symbol* name, 1315 const Symbol* signature, 1316 OverpassLookupMode overpass_mode, 1317 StaticLookupMode static_mode, 1318 PrivateLookupMode private_mode) const; 1319 1320 static Method* find_method_impl(const Array<Method*>* methods, 1321 const Symbol* name, 1322 const Symbol* signature, 1323 OverpassLookupMode overpass_mode, 1324 StaticLookupMode static_mode, 1325 PrivateLookupMode private_mode); 1326 1327 // Free CHeap allocated fields. 1328 void release_C_heap_structures(); 1329 1330 #if INCLUDE_JVMTI 1331 // RedefineClasses support 1332 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1333 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1334 #endif 1335 public: 1336 // CDS support - remove and restore oops from metadata. Oops are not shared. 1337 virtual void remove_unshareable_info(); 1338 virtual void remove_java_mirror(); 1339 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1340 1341 // jvm support 1342 jint compute_modifier_flags(TRAPS) const; 1343 1344 public: 1345 // JVMTI support 1346 jint jvmti_class_status() const; 1347 1348 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1349 1350 public: 1351 // Printing 1352 #ifndef PRODUCT 1353 void print_on(outputStream* st) const; 1354 #endif 1355 void print_value_on(outputStream* st) const; 1356 1357 void oop_print_value_on(oop obj, outputStream* st); 1358 1359 #ifndef PRODUCT 1360 void oop_print_on (oop obj, outputStream* st); 1361 1362 void print_dependent_nmethods(bool verbose = false); 1363 bool is_dependent_nmethod(nmethod* nm); 1364 bool verify_itable_index(int index); 1365 #endif 1366 1367 const char* internal_name() const; 1368 1369 // Verification 1370 void verify_on(outputStream* st); 1371 1372 void oop_verify_on(oop obj, outputStream* st); 1373 1374 // Logging 1375 void print_class_load_logging(ClassLoaderData* loader_data, 1376 const char* module_name, 1377 const ClassFileStream* cfs) const; 1378 }; 1379 1380 // for adding methods 1381 // UNSET_IDNUM return means no more ids available 1382 inline u2 InstanceKlass::next_method_idnum() { 1383 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1384 return ConstMethod::UNSET_IDNUM; // no more ids available 1385 } else { 1386 return _idnum_allocated_count++; 1387 } 1388 } 1389 1390 1391 /* JNIid class for jfieldIDs only */ 1392 class JNIid: public CHeapObj<mtClass> { 1393 friend class VMStructs; 1394 private: 1395 Klass* _holder; 1396 JNIid* _next; 1397 int _offset; 1398 #ifdef ASSERT 1399 bool _is_static_field_id; 1400 #endif 1401 1402 public: 1403 // Accessors 1404 Klass* holder() const { return _holder; } 1405 int offset() const { return _offset; } 1406 JNIid* next() { return _next; } 1407 // Constructor 1408 JNIid(Klass* holder, int offset, JNIid* next); 1409 // Identifier lookup 1410 JNIid* find(int offset); 1411 1412 bool find_local_field(fieldDescriptor* fd) { 1413 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1414 } 1415 1416 static void deallocate(JNIid* id); 1417 // Debugging 1418 #ifdef ASSERT 1419 bool is_static_field_id() const { return _is_static_field_id; } 1420 void set_is_static_field_id() { _is_static_field_id = true; } 1421 #endif 1422 void verify(Klass* holder); 1423 }; 1424 1425 // An iterator that's used to access the inner classes indices in the 1426 // InstanceKlass::_inner_classes array. 1427 class InnerClassesIterator : public StackObj { 1428 private: 1429 Array<jushort>* _inner_classes; 1430 int _length; 1431 int _idx; 1432 public: 1433 1434 InnerClassesIterator(const InstanceKlass* k) { 1435 _inner_classes = k->inner_classes(); 1436 if (k->inner_classes() != NULL) { 1437 _length = _inner_classes->length(); 1438 // The inner class array's length should be the multiple of 1439 // inner_class_next_offset if it only contains the InnerClasses 1440 // attribute data, or it should be 1441 // n*inner_class_next_offset+enclosing_method_attribute_size 1442 // if it also contains the EnclosingMethod data. 1443 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1444 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1445 "just checking"); 1446 // Remove the enclosing_method portion if exists. 1447 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1448 _length -= InstanceKlass::enclosing_method_attribute_size; 1449 } 1450 } else { 1451 _length = 0; 1452 } 1453 _idx = 0; 1454 } 1455 1456 int length() const { 1457 return _length; 1458 } 1459 1460 void next() { 1461 _idx += InstanceKlass::inner_class_next_offset; 1462 } 1463 1464 bool done() const { 1465 return (_idx >= _length); 1466 } 1467 1468 u2 inner_class_info_index() const { 1469 return _inner_classes->at( 1470 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1471 } 1472 1473 void set_inner_class_info_index(u2 index) { 1474 _inner_classes->at_put( 1475 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1476 } 1477 1478 u2 outer_class_info_index() const { 1479 return _inner_classes->at( 1480 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1481 } 1482 1483 void set_outer_class_info_index(u2 index) { 1484 _inner_classes->at_put( 1485 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1486 } 1487 1488 u2 inner_name_index() const { 1489 return _inner_classes->at( 1490 _idx + InstanceKlass::inner_class_inner_name_offset); 1491 } 1492 1493 void set_inner_name_index(u2 index) { 1494 _inner_classes->at_put( 1495 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1496 } 1497 1498 u2 inner_access_flags() const { 1499 return _inner_classes->at( 1500 _idx + InstanceKlass::inner_class_access_flags_offset); 1501 } 1502 }; 1503 1504 #endif // SHARE_OOPS_INSTANCEKLASS_HPP